config.c

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/* Copyright (c) 2001 Matej Pfajfar.
 * Copyright (c) 2001-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#define CONFIG_PRIVATE
#include "core/or/or.h"
#include "app/config/config.h"
#include "app/config/confparse.h"
#include "app/config/statefile.h"
#include "app/main/main.h"
#include "app/main/subsysmgr.h"
#include "core/mainloop/connection.h"
#include "core/mainloop/cpuworker.h"
#include "core/mainloop/mainloop.h"
#include "core/mainloop/netstatus.h"
#include "core/or/channel.h"
#include "core/or/circuitbuild.h"
#include "core/or/circuitlist.h"
#include "core/or/circuitmux.h"
#include "core/or/circuitmux_ewma.h"
#include "core/or/circuitstats.h"
#include "core/or/connection_edge.h"
#include "core/or/connection_or.h"
#include "core/or/dos.h"
#include "core/or/policies.h"
#include "core/or/relay.h"
#include "core/or/scheduler.h"
#include "feature/client/addressmap.h"
#include "feature/client/bridges.h"
#include "feature/client/entrynodes.h"
#include "feature/client/transports.h"
#include "feature/control/control.h"
#include "feature/dirauth/bwauth.h"
#include "feature/dirauth/guardfraction.h"
#include "feature/dircache/consdiffmgr.h"
#include "feature/dircache/dirserv.h"
#include "feature/dircommon/voting_schedule.h"
#include "feature/hibernate/hibernate.h"
#include "feature/hs/hs_config.h"
#include "feature/nodelist/dirlist.h"
#include "feature/nodelist/networkstatus.h"
#include "feature/nodelist/nickname.h"
#include "feature/nodelist/nodelist.h"
#include "feature/nodelist/routerlist.h"
#include "feature/nodelist/routerset.h"
#include "feature/relay/dns.h"
#include "feature/relay/ext_orport.h"
#include "feature/relay/routermode.h"
#include "feature/rend/rendclient.h"
#include "feature/rend/rendservice.h"
#include "lib/geoip/geoip.h"
#include "feature/stats/geoip_stats.h"
#include "feature/stats/predict_ports.h"
#include "feature/stats/rephist.h"
#include "lib/compress/compress.h"
#include "lib/crypt_ops/crypto_init.h"
#include "lib/crypt_ops/crypto_rand.h"
#include "lib/crypt_ops/crypto_util.h"
#include "lib/encoding/confline.h"
#include "lib/net/resolve.h"
#include "lib/sandbox/sandbox.h"
#include "lib/version/torversion.h"

#ifdef ENABLE_NSS
#include "lib/crypt_ops/crypto_nss_mgt.h"
#else
#include "lib/crypt_ops/crypto_openssl_mgt.h"
#endif

#ifdef _WIN32
#include <shlobj.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "lib/meminfo/meminfo.h"
#include "lib/osinfo/uname.h"
#include "lib/process/daemon.h"
#include "lib/process/pidfile.h"
#include "lib/process/restrict.h"
#include "lib/process/setuid.h"
#include "lib/process/process.h"
#include "lib/net/gethostname.h"
#include "lib/thread/numcpus.h"

#include "lib/encoding/keyval.h"
#include "lib/fs/conffile.h"
#include "lib/evloop/procmon.h"

#include "feature/dirauth/dirvote.h"
#include "feature/dirauth/recommend_pkg.h"
#include "feature/dirauth/authmode.h"

#include "core/or/connection_st.h"
#include "core/or/port_cfg_st.h"

#ifdef HAVE_SYSTEMD
#   if defined(__COVERITY__) && !defined(__INCLUDE_LEVEL__)
/* Systemd's use of gcc's __INCLUDE_LEVEL__ extension macro appears to confuse
 * Coverity. Here's a kludge to unconfuse it.
 */
#   define __INCLUDE_LEVEL__ 2
#endif /* defined(__COVERITY__) && !defined(__INCLUDE_LEVEL__) */
#include <systemd/sd-daemon.h>
#endif /* defined(HAVE_SYSTEMD) */

/* Prefix used to indicate a Unix socket in a FooPort configuration. */
static const char unix_socket_prefix[] = "unix:";
/* Prefix used to indicate a Unix socket with spaces in it, in a FooPort
 * configuration. */
static const char unix_q_socket_prefix[] = "unix:\"";

/* limits for TCP send and recv buffer size used for constrained sockets */
#define MIN_CONSTRAINED_TCP_BUFFER 2048
#define MAX_CONSTRAINED_TCP_BUFFER 262144  /* 256k */

#define DOWNLOAD_SCHEDULE(name) \
  { #name "DownloadSchedule", #name "DownloadInitialDelay", 0, 1 }

static config_abbrev_t option_abbrevs_[] = {
  PLURAL(AuthDirBadDirCC),
  PLURAL(AuthDirBadExitCC),
  PLURAL(AuthDirInvalidCC),
  PLURAL(AuthDirRejectCC),
  PLURAL(EntryNode),
  PLURAL(ExcludeNode),
  PLURAL(FirewallPort),
  PLURAL(LongLivedPort),
  PLURAL(HiddenServiceNode),
  PLURAL(HiddenServiceExcludeNode),
  PLURAL(NumCPU),
  PLURAL(RendNode),
  PLURAL(RecommendedPackage),
  PLURAL(RendExcludeNode),
  PLURAL(StrictEntryNode),
  PLURAL(StrictExitNode),
  PLURAL(StrictNode),
  { "l", "Log", 1, 0},
  { "AllowUnverifiedNodes", "AllowInvalidNodes", 0, 0},
  { "AutomapHostSuffixes", "AutomapHostsSuffixes", 0, 0},
  { "AutomapHostOnResolve", "AutomapHostsOnResolve", 0, 0},
  { "BandwidthRateBytes", "BandwidthRate", 0, 0},
  { "BandwidthBurstBytes", "BandwidthBurst", 0, 0},
  { "DirFetchPostPeriod", "StatusFetchPeriod", 0, 0},
  { "DirServer", "DirAuthority", 0, 0}, /* XXXX later, make this warn? */
  { "MaxConn", "ConnLimit", 0, 1},
  { "MaxMemInCellQueues", "MaxMemInQueues", 0, 0},
  { "ORBindAddress", "ORListenAddress", 0, 0},
  { "DirBindAddress", "DirListenAddress", 0, 0},
  { "SocksBindAddress", "SocksListenAddress", 0, 0},
  { "UseHelperNodes", "UseEntryGuards", 0, 0},
  { "NumHelperNodes", "NumEntryGuards", 0, 0},
  { "UseEntryNodes", "UseEntryGuards", 0, 0},
  { "NumEntryNodes", "NumEntryGuards", 0, 0},
  { "ResolvConf", "ServerDNSResolvConfFile", 0, 1},
  { "SearchDomains", "ServerDNSSearchDomains", 0, 1},
  { "ServerDNSAllowBrokenResolvConf", "ServerDNSAllowBrokenConfig", 0, 0},
  { "PreferTunnelledDirConns", "PreferTunneledDirConns", 0, 0},
  { "BridgeAuthoritativeDirectory", "BridgeAuthoritativeDir", 0, 0},
  { "HashedControlPassword", "__HashedControlSessionPassword", 1, 0},
  { "VirtualAddrNetwork", "VirtualAddrNetworkIPv4", 0, 0},
  { "SocksSocketsGroupWritable", "UnixSocksGroupWritable", 0, 1},
  { "_HSLayer2Nodes", "HSLayer2Nodes", 0, 1 },
  { "_HSLayer3Nodes", "HSLayer3Nodes", 0, 1 },

  DOWNLOAD_SCHEDULE(ClientBootstrapConsensusAuthority),
  DOWNLOAD_SCHEDULE(ClientBootstrapConsensusAuthorityOnly),
  DOWNLOAD_SCHEDULE(ClientBootstrapConsensusFallback),
  DOWNLOAD_SCHEDULE(TestingBridge),
  DOWNLOAD_SCHEDULE(TestingBridgeBootstrap),
  DOWNLOAD_SCHEDULE(TestingClient),
  DOWNLOAD_SCHEDULE(TestingClientConsensus),
  DOWNLOAD_SCHEDULE(TestingServer),
  DOWNLOAD_SCHEDULE(TestingServerConsensus),

  { NULL, NULL, 0, 0},
};

DUMMY_TYPECHECK_INSTANCE(or_options_t);

#define VAR(name,conftype,member,initvalue)                             \
  { name, CONFIG_TYPE_ ## conftype, offsetof(or_options_t, member),     \
      initvalue CONF_TEST_MEMBERS(or_options_t, conftype, member) }

#define V(member,conftype,initvalue)                                    \
  VAR(#member, conftype, member, initvalue)

#ifdef TOR_UNIT_TESTS
#define OBSOLETE(name) { name, CONFIG_TYPE_OBSOLETE, 0, NULL, {.INT=NULL} }
#else
#define OBSOLETE(name) { name, CONFIG_TYPE_OBSOLETE, 0, NULL }
#endif

#define VPORT(member)                                           \
  VAR(#member "Lines", LINELIST_V, member ## _lines, NULL),     \
  VAR(#member, LINELIST_S, member ## _lines, NULL),             \
  VAR("__" #member, LINELIST_S, member ## _lines, NULL)

#define UINT64_MAX_STRING "18446744073709551615"

static config_var_t option_vars_[] = {
  V(AccountingMax,               MEMUNIT,  "0 bytes"),
  VAR("AccountingRule",          STRING,   AccountingRule_option,  "max"),
  V(AccountingStart,             STRING,   NULL),
  V(Address,                     STRING,   NULL),
  OBSOLETE("AllowDotExit"),
  OBSOLETE("AllowInvalidNodes"),
  V(AllowNonRFC953Hostnames,     BOOL,     "0"),
  OBSOLETE("AllowSingleHopCircuits"),
  OBSOLETE("AllowSingleHopExits"),
  V(AlternateBridgeAuthority,    LINELIST, NULL),
  V(AlternateDirAuthority,       LINELIST, NULL),
  OBSOLETE("AlternateHSAuthority"),
  V(AssumeReachable,             BOOL,     "0"),
  OBSOLETE("AuthDirBadDir"),
  OBSOLETE("AuthDirBadDirCCs"),
  V(AuthDirBadExit,              LINELIST, NULL),
  V(AuthDirBadExitCCs,           CSV,      ""),
  V(AuthDirInvalid,              LINELIST, NULL),
  V(AuthDirInvalidCCs,           CSV,      ""),
  V(AuthDirFastGuarantee,        MEMUNIT,  "100 KB"),
  V(AuthDirGuardBWGuarantee,     MEMUNIT,  "2 MB"),
  V(AuthDirPinKeys,              BOOL,     "1"),
  V(AuthDirReject,               LINELIST, NULL),
  V(AuthDirRejectCCs,            CSV,      ""),
  OBSOLETE("AuthDirRejectUnlisted"),
  OBSOLETE("AuthDirListBadDirs"),
  V(AuthDirListBadExits,         BOOL,     "0"),
  V(AuthDirMaxServersPerAddr,    UINT,     "2"),
  OBSOLETE("AuthDirMaxServersPerAuthAddr"),
  V(AuthDirHasIPv6Connectivity,  BOOL,     "0"),
  VAR("AuthoritativeDirectory",  BOOL, AuthoritativeDir,    "0"),
  V(AutomapHostsOnResolve,       BOOL,     "0"),
  V(AutomapHostsSuffixes,        CSV,      ".onion,.exit"),
  V(AvoidDiskWrites,             BOOL,     "0"),
  V(BandwidthBurst,              MEMUNIT,  "1 GB"),
  V(BandwidthRate,               MEMUNIT,  "1 GB"),
  V(BridgeAuthoritativeDir,      BOOL,     "0"),
  VAR("Bridge",                  LINELIST, Bridges,    NULL),
  V(BridgePassword,              STRING,   NULL),
  V(BridgeRecordUsageByCountry,  BOOL,     "1"),
  V(BridgeRelay,                 BOOL,     "0"),
  V(BridgeDistribution,          STRING,   NULL),
  VAR("CacheDirectory",          FILENAME, CacheDirectory_option, NULL),
  V(CacheDirectoryGroupReadable, AUTOBOOL,     "auto"),
  V(CellStatistics,              BOOL,     "0"),
  V(PaddingStatistics,           BOOL,     "1"),
  V(LearnCircuitBuildTimeout,    BOOL,     "1"),
  V(CircuitBuildTimeout,         INTERVAL, "0"),
  OBSOLETE("CircuitIdleTimeout"),
  V(CircuitsAvailableTimeout,    INTERVAL, "0"),
  V(CircuitStreamTimeout,        INTERVAL, "0"),
  V(CircuitPriorityHalflife,     DOUBLE,  "-1.0"), /*negative:'Use default'*/
  V(ClientDNSRejectInternalAddresses, BOOL,"1"),
  V(ClientOnly,                  BOOL,     "0"),
  V(ClientPreferIPv6ORPort,      AUTOBOOL, "auto"),
  V(ClientPreferIPv6DirPort,     AUTOBOOL, "auto"),
  V(ClientAutoIPv6ORPort,        BOOL,     "0"),
  V(ClientRejectInternalAddresses, BOOL,   "1"),
  V(ClientTransportPlugin,       LINELIST, NULL),
  V(ClientUseIPv6,               BOOL,     "0"),
  V(ClientUseIPv4,               BOOL,     "1"),
  V(ConsensusParams,             STRING,   NULL),
  V(ConnLimit,                   UINT,     "1000"),
  V(ConnDirectionStatistics,     BOOL,     "0"),
  V(ConstrainedSockets,          BOOL,     "0"),
  V(ConstrainedSockSize,         MEMUNIT,  "8192"),
  V(ContactInfo,                 STRING,   NULL),
  OBSOLETE("ControlListenAddress"),
  VPORT(ControlPort),
  V(ControlPortFileGroupReadable,BOOL,     "0"),
  V(ControlPortWriteToFile,      FILENAME, NULL),
  V(ControlSocket,               LINELIST, NULL),
  V(ControlSocketsGroupWritable, BOOL,     "0"),
  V(UnixSocksGroupWritable,    BOOL,     "0"),
  V(CookieAuthentication,        BOOL,     "0"),
  V(CookieAuthFileGroupReadable, BOOL,     "0"),
  V(CookieAuthFile,              STRING,   NULL),
  V(CountPrivateBandwidth,       BOOL,     "0"),
  VAR("DataDirectory",           FILENAME, DataDirectory_option, NULL),
  V(DataDirectoryGroupReadable,  BOOL,     "0"),
  V(DisableOOSCheck,             BOOL,     "1"),
  V(DisableNetwork,              BOOL,     "0"),
  V(DirAllowPrivateAddresses,    BOOL,     "0"),
  V(TestingAuthDirTimeToLearnReachability, INTERVAL, "30 minutes"),
  OBSOLETE("DirListenAddress"),
  V(DirPolicy,                   LINELIST, NULL),
  VPORT(DirPort),
  V(DirPortFrontPage,            FILENAME, NULL),
  VAR("DirReqStatistics",        BOOL,     DirReqStatistics_option, "1"),
  VAR("DirAuthority",            LINELIST, DirAuthorities, NULL),
  V(DirCache,                    BOOL,     "1"),
  /* A DirAuthorityFallbackRate of 0.1 means that 0.5% of clients try an
   * authority when all fallbacks are up, and 2% try an authority when 25% of
   * fallbacks are down. (We rebuild the list when 25% of fallbacks are down).
   *
   * We want to reduce load on authorities, but keep these two figures within
   * an order of magnitude, so there isn't too much load shifting to
   * authorities when fallbacks go down. */
  V(DirAuthorityFallbackRate,    DOUBLE,   "0.1"),
  V(DisableAllSwap,              BOOL,     "0"),
  V(DisableDebuggerAttachment,   BOOL,     "1"),
  OBSOLETE("DisableIOCP"),
  OBSOLETE("DisableV2DirectoryInfo_"),
  OBSOLETE("DynamicDHGroups"),
  VPORT(DNSPort),
  OBSOLETE("DNSListenAddress"),
  V(DormantClientTimeout,         INTERVAL, "24 hours"),
  V(DormantTimeoutDisabledByIdleStreams, BOOL,     "1"),
  V(DormantOnFirstStartup,       BOOL,      "0"),
  /* DoS circuit creation options. */
  V(DoSCircuitCreationEnabled,   AUTOBOOL, "auto"),
  V(DoSCircuitCreationMinConnections,      UINT, "0"),
  V(DoSCircuitCreationRate,      UINT,     "0"),
  V(DoSCircuitCreationBurst,     UINT,     "0"),
  V(DoSCircuitCreationDefenseType,         INT,  "0"),
  V(DoSCircuitCreationDefenseTimePeriod,   INTERVAL, "0"),
  /* DoS connection options. */
  V(DoSConnectionEnabled,        AUTOBOOL, "auto"),
  V(DoSConnectionMaxConcurrentCount,       UINT, "0"),
  V(DoSConnectionDefenseType,    INT,      "0"),
  /* DoS single hop client options. */
  V(DoSRefuseSingleHopClientRendezvous,    AUTOBOOL, "auto"),
  V(DownloadExtraInfo,           BOOL,     "0"),
  V(TestingEnableConnBwEvent,    BOOL,     "0"),
  V(TestingEnableCellStatsEvent, BOOL,     "0"),
  OBSOLETE("TestingEnableTbEmptyEvent"),
  V(EnforceDistinctSubnets,      BOOL,     "1"),
  V(EntryNodes,                  ROUTERSET,   NULL),
  V(EntryStatistics,             BOOL,     "0"),
  V(TestingEstimatedDescriptorPropagationTime, INTERVAL, "10 minutes"),
  V(ExcludeNodes,                ROUTERSET, NULL),
  V(ExcludeExitNodes,            ROUTERSET, NULL),
  OBSOLETE("ExcludeSingleHopRelays"),
  V(ExitNodes,                   ROUTERSET, NULL),
  /* Researchers need a way to tell their clients to use specific
   * middles that they also control, to allow safe live-network
   * experimentation with new padding machines. */
  V(MiddleNodes,                 ROUTERSET, NULL),
  V(ExitPolicy,                  LINELIST, NULL),
  V(ExitPolicyRejectPrivate,     BOOL,     "1"),
  V(ExitPolicyRejectLocalInterfaces, BOOL, "0"),
  V(ExitPortStatistics,          BOOL,     "0"),
  V(ExtendAllowPrivateAddresses, BOOL,     "0"),
  V(ExitRelay,                   AUTOBOOL, "auto"),
  VPORT(ExtORPort),
  V(ExtORPortCookieAuthFile,     STRING,   NULL),
  V(ExtORPortCookieAuthFileGroupReadable, BOOL, "0"),
  V(ExtraInfoStatistics,         BOOL,     "1"),
  V(ExtendByEd25519ID,           AUTOBOOL, "auto"),
  V(FallbackDir,                 LINELIST, NULL),

  V(UseDefaultFallbackDirs,      BOOL,     "1"),

  OBSOLETE("FallbackNetworkstatusFile"),
  V(FascistFirewall,             BOOL,     "0"),
  V(FirewallPorts,               CSV,      ""),
  OBSOLETE("FastFirstHopPK"),
  V(FetchDirInfoEarly,           BOOL,     "0"),
  V(FetchDirInfoExtraEarly,      BOOL,     "0"),
  V(FetchServerDescriptors,      BOOL,     "1"),
  V(FetchHidServDescriptors,     BOOL,     "1"),
  V(FetchUselessDescriptors,     BOOL,     "0"),
  OBSOLETE("FetchV2Networkstatus"),
  V(GeoIPExcludeUnknown,         AUTOBOOL, "auto"),
#ifdef _WIN32
  V(GeoIPFile,                   FILENAME, "<default>"),
  V(GeoIPv6File,                 FILENAME, "<default>"),
#else
  V(GeoIPFile,                   FILENAME,
    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "geoip"),
  V(GeoIPv6File,                 FILENAME,
    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "geoip6"),
#endif /* defined(_WIN32) */
  OBSOLETE("Group"),
  V(GuardLifetime,               INTERVAL, "0 minutes"),
  V(HardwareAccel,               BOOL,     "0"),
  V(HeartbeatPeriod,             INTERVAL, "6 hours"),
  V(MainloopStats,               BOOL,     "0"),
  V(AccelName,                   STRING,   NULL),
  V(AccelDir,                    FILENAME, NULL),
  V(HashedControlPassword,       LINELIST, NULL),
  OBSOLETE("HidServDirectoryV2"),
  VAR("HiddenServiceDir",    LINELIST_S, RendConfigLines,    NULL),
  VAR("HiddenServiceDirGroupReadable",  LINELIST_S, RendConfigLines, NULL),
  VAR("HiddenServiceOptions",LINELIST_V, RendConfigLines,    NULL),
  VAR("HiddenServicePort",   LINELIST_S, RendConfigLines,    NULL),
  VAR("HiddenServiceVersion",LINELIST_S, RendConfigLines,    NULL),
  VAR("HiddenServiceAuthorizeClient",LINELIST_S,RendConfigLines, NULL),
  VAR("HiddenServiceAllowUnknownPorts",LINELIST_S, RendConfigLines, NULL),
  VAR("HiddenServiceMaxStreams",LINELIST_S, RendConfigLines, NULL),
  VAR("HiddenServiceMaxStreamsCloseCircuit",LINELIST_S, RendConfigLines, NULL),
  VAR("HiddenServiceNumIntroductionPoints", LINELIST_S, RendConfigLines, NULL),
  VAR("HiddenServiceExportCircuitID", LINELIST_S,  RendConfigLines, NULL),
  VAR("HiddenServiceStatistics", BOOL, HiddenServiceStatistics_option, "1"),
  V(HidServAuth,                 LINELIST, NULL),
  V(ClientOnionAuthDir,          FILENAME, NULL),
  OBSOLETE("CloseHSClientCircuitsImmediatelyOnTimeout"),
  OBSOLETE("CloseHSServiceRendCircuitsImmediatelyOnTimeout"),
  V(HiddenServiceSingleHopMode,  BOOL,     "0"),
  V(HiddenServiceNonAnonymousMode,BOOL,    "0"),
  V(HTTPProxy,                   STRING,   NULL),
  V(HTTPProxyAuthenticator,      STRING,   NULL),
  V(HTTPSProxy,                  STRING,   NULL),
  V(HTTPSProxyAuthenticator,     STRING,   NULL),
  VPORT(HTTPTunnelPort),
  V(IPv6Exit,                    BOOL,     "0"),
  VAR("ServerTransportPlugin",   LINELIST, ServerTransportPlugin,  NULL),
  V(ServerTransportListenAddr,   LINELIST, NULL),
  V(ServerTransportOptions,      LINELIST, NULL),
  V(SigningKeyLifetime,          INTERVAL, "30 days"),
  V(Socks4Proxy,                 STRING,   NULL),
  V(Socks5Proxy,                 STRING,   NULL),
  V(Socks5ProxyUsername,         STRING,   NULL),
  V(Socks5ProxyPassword,         STRING,   NULL),
  VAR("KeyDirectory",            FILENAME, KeyDirectory_option, NULL),
  V(KeyDirectoryGroupReadable,   BOOL,     "0"),
  VAR("HSLayer2Nodes",           ROUTERSET,  HSLayer2Nodes,  NULL),
  VAR("HSLayer3Nodes",           ROUTERSET,  HSLayer3Nodes,  NULL),
  V(KeepalivePeriod,             INTERVAL, "5 minutes"),
  V(KeepBindCapabilities,            AUTOBOOL, "auto"),
  VAR("Log",                     LINELIST, Logs,             NULL),
  V(LogMessageDomains,           BOOL,     "0"),
  V(LogTimeGranularity,          MSEC_INTERVAL, "1 second"),
  V(TruncateLogFile,             BOOL,     "0"),
  V(SyslogIdentityTag,           STRING,   NULL),
  V(AndroidIdentityTag,          STRING,   NULL),
  V(LongLivedPorts,              CSV,
        "21,22,706,1863,5050,5190,5222,5223,6523,6667,6697,8300"),
  VAR("MapAddress",              LINELIST, AddressMap,           NULL),
  V(MaxAdvertisedBandwidth,      MEMUNIT,  "1 GB"),
  V(MaxCircuitDirtiness,         INTERVAL, "10 minutes"),
  V(MaxClientCircuitsPending,    UINT,     "32"),
  V(MaxConsensusAgeForDiffs,     INTERVAL, "0 seconds"),
  VAR("MaxMemInQueues",          MEMUNIT,   MaxMemInQueues_raw, "0"),
  OBSOLETE("MaxOnionsPending"),
  V(MaxOnionQueueDelay,          MSEC_INTERVAL, "1750 msec"),
  V(MaxUnparseableDescSizeToLog, MEMUNIT, "10 MB"),
  V(MinMeasuredBWsForAuthToIgnoreAdvertised, INT, "500"),
  VAR("MyFamily",                LINELIST, MyFamily_lines,       NULL),
  V(NewCircuitPeriod,            INTERVAL, "30 seconds"),
  OBSOLETE("NamingAuthoritativeDirectory"),
  OBSOLETE("NATDListenAddress"),
  VPORT(NATDPort),
  V(Nickname,                    STRING,   NULL),
  OBSOLETE("PredictedPortsRelevanceTime"),
  OBSOLETE("WarnUnsafeSocks"),
  VAR("NodeFamily",              LINELIST, NodeFamilies,         NULL),
  V(NoExec,                      BOOL,     "0"),
  V(NumCPUs,                     UINT,     "0"),
  V(NumDirectoryGuards,          UINT,     "0"),
  V(NumEntryGuards,              UINT,     "0"),
  V(NumPrimaryGuards,            UINT,     "0"),
  V(OfflineMasterKey,            BOOL,     "0"),
  OBSOLETE("ORListenAddress"),
  VPORT(ORPort),
  V(OutboundBindAddress,         LINELIST,   NULL),
  V(OutboundBindAddressOR,       LINELIST,   NULL),
  V(OutboundBindAddressExit,     LINELIST,   NULL),

  OBSOLETE("PathBiasDisableRate"),
  V(PathBiasCircThreshold,       INT,      "-1"),
  V(PathBiasNoticeRate,          DOUBLE,   "-1"),
  V(PathBiasWarnRate,            DOUBLE,   "-1"),
  V(PathBiasExtremeRate,         DOUBLE,   "-1"),
  V(PathBiasScaleThreshold,      INT,      "-1"),
  OBSOLETE("PathBiasScaleFactor"),
  OBSOLETE("PathBiasMultFactor"),
  V(PathBiasDropGuards,          AUTOBOOL, "0"),
  OBSOLETE("PathBiasUseCloseCounts"),

  V(PathBiasUseThreshold,       INT,      "-1"),
  V(PathBiasNoticeUseRate,          DOUBLE,   "-1"),
  V(PathBiasExtremeUseRate,         DOUBLE,   "-1"),
  V(PathBiasScaleUseThreshold,      INT,      "-1"),

  V(PathsNeededToBuildCircuits,  DOUBLE,   "-1"),
  V(PerConnBWBurst,              MEMUNIT,  "0"),
  V(PerConnBWRate,               MEMUNIT,  "0"),
  V(PidFile,                     STRING,   NULL),
  V(TestingTorNetwork,           BOOL,     "0"),
  V(TestingMinExitFlagThreshold, MEMUNIT,  "0"),
  V(TestingMinFastFlagThreshold, MEMUNIT,  "0"),

  V(TestingLinkCertLifetime,          INTERVAL, "2 days"),
  V(TestingAuthKeyLifetime,          INTERVAL, "2 days"),
  V(TestingLinkKeySlop,              INTERVAL, "3 hours"),
  V(TestingAuthKeySlop,              INTERVAL, "3 hours"),
  V(TestingSigningKeySlop,           INTERVAL, "1 day"),

  V(OptimisticData,              AUTOBOOL, "auto"),
  OBSOLETE("PortForwarding"),
  OBSOLETE("PortForwardingHelper"),
  OBSOLETE("PreferTunneledDirConns"),
  V(ProtocolWarnings,            BOOL,     "0"),
  V(PublishServerDescriptor,     CSV,      "1"),
  V(PublishHidServDescriptors,   BOOL,     "1"),
  V(ReachableAddresses,          LINELIST, NULL),
  V(ReachableDirAddresses,       LINELIST, NULL),
  V(ReachableORAddresses,        LINELIST, NULL),
  V(RecommendedVersions,         LINELIST, NULL),
  V(RecommendedClientVersions,   LINELIST, NULL),
  V(RecommendedServerVersions,   LINELIST, NULL),
  V(RecommendedPackages,         LINELIST, NULL),
  V(ReducedConnectionPadding,    BOOL,     "0"),
  V(ConnectionPadding,           AUTOBOOL, "auto"),
  V(RefuseUnknownExits,          AUTOBOOL, "auto"),
  V(RejectPlaintextPorts,        CSV,      ""),
  V(RelayBandwidthBurst,         MEMUNIT,  "0"),
  V(RelayBandwidthRate,          MEMUNIT,  "0"),
  V(RendPostPeriod,              INTERVAL, "1 hour"),
  V(RephistTrackTime,            INTERVAL, "24 hours"),
  V(RunAsDaemon,                 BOOL,     "0"),
  V(ReducedExitPolicy,           BOOL,     "0"),
  OBSOLETE("RunTesting"), // currently unused
  V(Sandbox,                     BOOL,     "0"),
  V(SafeLogging,                 STRING,   "1"),
  V(SafeSocks,                   BOOL,     "0"),
  V(ServerDNSAllowBrokenConfig,  BOOL,     "1"),
  V(ServerDNSAllowNonRFC953Hostnames, BOOL,"0"),
  V(ServerDNSDetectHijacking,    BOOL,     "1"),
  V(ServerDNSRandomizeCase,      BOOL,     "1"),
  V(ServerDNSResolvConfFile,     STRING,   NULL),
  V(ServerDNSSearchDomains,      BOOL,     "0"),
  V(ServerDNSTestAddresses,      CSV,
      "www.google.com,www.mit.edu,www.yahoo.com,www.slashdot.org"),
  OBSOLETE("SchedulerLowWaterMark__"),
  OBSOLETE("SchedulerHighWaterMark__"),
  OBSOLETE("SchedulerMaxFlushCells__"),
  V(KISTSchedRunInterval,        MSEC_INTERVAL, "0 msec"),
  V(KISTSockBufSizeFactor,       DOUBLE,   "1.0"),
  V(Schedulers,                  CSV,      "KIST,KISTLite,Vanilla"),
  V(ShutdownWaitLength,          INTERVAL, "30 seconds"),
  OBSOLETE("SocksListenAddress"),
  V(SocksPolicy,                 LINELIST, NULL),
  VPORT(SocksPort),
  V(SocksTimeout,                INTERVAL, "2 minutes"),
  V(SSLKeyLifetime,              INTERVAL, "0"),
  OBSOLETE("StrictEntryNodes"),
  OBSOLETE("StrictExitNodes"),
  V(StrictNodes,                 BOOL,     "0"),
  OBSOLETE("Support022HiddenServices"),
  V(TestSocks,                   BOOL,     "0"),
  V(TokenBucketRefillInterval,   MSEC_INTERVAL, "100 msec"),
  OBSOLETE("Tor2webMode"),
  OBSOLETE("Tor2webRendezvousPoints"),
  OBSOLETE("TLSECGroup"),
  V(TrackHostExits,              CSV,      NULL),
  V(TrackHostExitsExpire,        INTERVAL, "30 minutes"),
  OBSOLETE("TransListenAddress"),
  VPORT(TransPort),
  V(TransProxyType,              STRING,   "default"),
  OBSOLETE("TunnelDirConns"),
  V(UpdateBridgesFromAuthority,  BOOL,     "0"),
  V(UseBridges,                  BOOL,     "0"),
  VAR("UseEntryGuards",          BOOL,     UseEntryGuards_option, "1"),
  OBSOLETE("UseEntryGuardsAsDirGuards"),
  V(UseGuardFraction,            AUTOBOOL, "auto"),
  V(UseMicrodescriptors,         AUTOBOOL, "auto"),
  OBSOLETE("UseNTorHandshake"),
  V(User,                        STRING,   NULL),
  OBSOLETE("UserspaceIOCPBuffers"),
  V(AuthDirSharedRandomness,     BOOL,     "1"),
  V(AuthDirTestEd25519LinkKeys,  BOOL,     "1"),
  OBSOLETE("V1AuthoritativeDirectory"),
  OBSOLETE("V2AuthoritativeDirectory"),
  VAR("V3AuthoritativeDirectory",BOOL, V3AuthoritativeDir,   "0"),
  V(TestingV3AuthInitialVotingInterval, INTERVAL, "30 minutes"),
  V(TestingV3AuthInitialVoteDelay, INTERVAL, "5 minutes"),
  V(TestingV3AuthInitialDistDelay, INTERVAL, "5 minutes"),
  V(TestingV3AuthVotingStartOffset, INTERVAL, "0"),
  V(V3AuthVotingInterval,        INTERVAL, "1 hour"),
  V(V3AuthVoteDelay,             INTERVAL, "5 minutes"),
  V(V3AuthDistDelay,             INTERVAL, "5 minutes"),
  V(V3AuthNIntervalsValid,       UINT,     "3"),
  V(V3AuthUseLegacyKey,          BOOL,     "0"),
  V(V3BandwidthsFile,            FILENAME, NULL),
  V(GuardfractionFile,           FILENAME, NULL),
  VAR("VersioningAuthoritativeDirectory",BOOL,VersioningAuthoritativeDir, "0"),
  OBSOLETE("VoteOnHidServDirectoriesV2"),
  V(VirtualAddrNetworkIPv4,      STRING,   "127.192.0.0/10"),
  V(VirtualAddrNetworkIPv6,      STRING,   "[FE80::]/10"),
  V(WarnPlaintextPorts,          CSV,      "23,109,110,143"),
  OBSOLETE("UseFilteringSSLBufferevents"),
  OBSOLETE("__UseFilteringSSLBufferevents"),
  VAR("__ReloadTorrcOnSIGHUP",   BOOL,  ReloadTorrcOnSIGHUP,      "1"),
  VAR("__AllDirActionsPrivate",  BOOL,  AllDirActionsPrivate,     "0"),
  VAR("__DisablePredictedCircuits",BOOL,DisablePredictedCircuits, "0"),
  VAR("__DisableSignalHandlers", BOOL,  DisableSignalHandlers,    "0"),
  VAR("__LeaveStreamsUnattached",BOOL,  LeaveStreamsUnattached,   "0"),
  VAR("__HashedControlSessionPassword", LINELIST, HashedControlSessionPassword,
      NULL),
  VAR("__OwningControllerProcess",STRING,OwningControllerProcess, NULL),
  VAR("__OwningControllerFD", UINT64, OwningControllerFD, UINT64_MAX_STRING),
  V(MinUptimeHidServDirectoryV2, INTERVAL, "96 hours"),
  V(TestingServerDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingClientDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingServerConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingClientConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
  /* With the ClientBootstrapConsensus*Download* below:
   * Clients with only authorities will try:
   *  - at least 3 authorities over 10 seconds, then exponentially backoff,
   *    with the next attempt 3-21 seconds later,
   * Clients with authorities and fallbacks will try:
   *  - at least 2 authorities and 4 fallbacks over 21 seconds, then
   *    exponentially backoff, with the next attempts 4-33 seconds later,
   * Clients will also retry when an application request arrives.
   * After a number of failed requests, clients retry every 3 days + 1 hour.
   *
   * Clients used to try 2 authorities over 10 seconds, then wait for
   * 60 minutes or an application request.
   *
   * When clients have authorities and fallbacks available, they use these
   * schedules: (we stagger the times to avoid thundering herds) */
  V(ClientBootstrapConsensusAuthorityDownloadInitialDelay, CSV_INTERVAL, "6"),
  V(ClientBootstrapConsensusFallbackDownloadInitialDelay, CSV_INTERVAL, "0"),
  /* When clients only have authorities available, they use this schedule: */
  V(ClientBootstrapConsensusAuthorityOnlyDownloadInitialDelay, CSV_INTERVAL,
    "0"),
  /* We don't want to overwhelm slow networks (or mirrors whose replies are
   * blocked), but we also don't want to fail if only some mirrors are
   * blackholed. Clients will try 3 directories simultaneously.
   * (Relays never use simultaneous connections.) */
  V(ClientBootstrapConsensusMaxInProgressTries, UINT, "3"),
  /* When a client has any running bridges, check each bridge occasionally,
    * whether or not that bridge is actually up. */
  V(TestingBridgeDownloadInitialDelay, CSV_INTERVAL,"10800"),
  /* When a client is just starting, or has no running bridges, check each
   * bridge a few times quickly, and then try again later. These schedules
   * are much longer than the other schedules, because we try each and every
   * configured bridge with this schedule. */
  V(TestingBridgeBootstrapDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingClientMaxIntervalWithoutRequest, INTERVAL, "10 minutes"),
  V(TestingDirConnectionMaxStall, INTERVAL, "5 minutes"),
  OBSOLETE("TestingConsensusMaxDownloadTries"),
  OBSOLETE("ClientBootstrapConsensusMaxDownloadTries"),
  OBSOLETE("ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries"),
  OBSOLETE("TestingDescriptorMaxDownloadTries"),
  OBSOLETE("TestingMicrodescMaxDownloadTries"),
  OBSOLETE("TestingCertMaxDownloadTries"),
  V(TestingDirAuthVoteExit, ROUTERSET, NULL),
  V(TestingDirAuthVoteExitIsStrict,  BOOL,     "0"),
  V(TestingDirAuthVoteGuard, ROUTERSET, NULL),
  V(TestingDirAuthVoteGuardIsStrict,  BOOL,     "0"),
  V(TestingDirAuthVoteHSDir, ROUTERSET, NULL),
  V(TestingDirAuthVoteHSDirIsStrict,  BOOL,     "0"),
  VAR("___UsingTestNetworkDefaults", BOOL, UsingTestNetworkDefaults_, "0"),

  END_OF_CONFIG_VARS
};

static const config_var_t testing_tor_network_defaults[] = {
  V(DirAllowPrivateAddresses,    BOOL,     "1"),
  V(EnforceDistinctSubnets,      BOOL,     "0"),
  V(AssumeReachable,             BOOL,     "1"),
  V(AuthDirMaxServersPerAddr,    UINT,     "0"),
  V(ClientBootstrapConsensusAuthorityDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(ClientBootstrapConsensusFallbackDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(ClientBootstrapConsensusAuthorityOnlyDownloadInitialDelay, CSV_INTERVAL,
    "0"),
  V(ClientDNSRejectInternalAddresses, BOOL,"0"),
  V(ClientRejectInternalAddresses, BOOL,   "0"),
  V(CountPrivateBandwidth,       BOOL,     "1"),
  V(ExitPolicyRejectPrivate,     BOOL,     "0"),
  V(ExtendAllowPrivateAddresses, BOOL,     "1"),
  V(V3AuthVotingInterval,        INTERVAL, "5 minutes"),
  V(V3AuthVoteDelay,             INTERVAL, "20 seconds"),
  V(V3AuthDistDelay,             INTERVAL, "20 seconds"),
  V(TestingV3AuthInitialVotingInterval, INTERVAL, "150 seconds"),
  V(TestingV3AuthInitialVoteDelay, INTERVAL, "20 seconds"),
  V(TestingV3AuthInitialDistDelay, INTERVAL, "20 seconds"),
  V(TestingAuthDirTimeToLearnReachability, INTERVAL, "0 minutes"),
  V(TestingEstimatedDescriptorPropagationTime, INTERVAL, "0 minutes"),
  V(MinUptimeHidServDirectoryV2, INTERVAL, "0 minutes"),
  V(TestingServerDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingClientDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingServerConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingClientConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingBridgeDownloadInitialDelay, CSV_INTERVAL, "10"),
  V(TestingBridgeBootstrapDownloadInitialDelay, CSV_INTERVAL, "0"),
  V(TestingClientMaxIntervalWithoutRequest, INTERVAL, "5 seconds"),
  V(TestingDirConnectionMaxStall, INTERVAL, "30 seconds"),
  V(TestingEnableConnBwEvent,    BOOL,     "1"),
  V(TestingEnableCellStatsEvent, BOOL,     "1"),
  VAR("___UsingTestNetworkDefaults", BOOL, UsingTestNetworkDefaults_, "1"),
  V(RendPostPeriod,              INTERVAL, "2 minutes"),

  END_OF_CONFIG_VARS
};

#undef VAR
#undef V
#undef OBSOLETE

static const config_deprecation_t option_deprecation_notes_[] = {
  /* Deprecated since 0.3.2.0-alpha. */
  { "HTTPProxy", "It only applies to direct unencrypted HTTP connections "
    "to your directory server, which your Tor probably wasn't using." },
  { "HTTPProxyAuthenticator", "HTTPProxy is deprecated in favor of HTTPSProxy "
    "which should be used with HTTPSProxyAuthenticator." },
  /* End of options deprecated since 0.3.2.1-alpha */

  /* Options deprecated since 0.3.2.2-alpha */
  { "ReachableDirAddresses", "It has no effect on relays, and has had no "
    "effect on clients since 0.2.8." },
  { "ClientPreferIPv6DirPort", "It has no effect on relays, and has had no "
    "effect on clients since 0.2.8." },
  /* End of options deprecated since 0.3.2.2-alpha. */

  { NULL, NULL }
};

#ifdef _WIN32
static char *get_windows_conf_root(void);
#endif
static int options_act_reversible(const or_options_t *old_options, char **msg);
static int options_transition_allowed(const or_options_t *old,
                                      const or_options_t *new,
                                      char **msg);
static int options_transition_affects_workers(
      const or_options_t *old_options, const or_options_t *new_options);
static int options_transition_affects_descriptor(
      const or_options_t *old_options, const or_options_t *new_options);
static int options_transition_affects_dirauth_timing(
      const or_options_t *old_options, const or_options_t *new_options);
static int normalize_nickname_list(config_line_t **normalized_out,
                                   const config_line_t *lst, const char *name,
                                   char **msg);
static char *get_bindaddr_from_transport_listen_line(const char *line,
                                                     const char *transport);
static int parse_ports(or_options_t *options, int validate_only,
                              char **msg_out, int *n_ports_out,
                              int *world_writable_control_socket);
static int check_server_ports(const smartlist_t *ports,
                              const or_options_t *options,
                              int *num_low_ports_out);
static int validate_data_directories(or_options_t *options);
static int write_configuration_file(const char *fname,
                                    const or_options_t *options);
static int options_init_logs(const or_options_t *old_options,
                             or_options_t *options, int validate_only);

static void init_libevent(const or_options_t *options);
static int opt_streq(const char *s1, const char *s2);
static int parse_outbound_addresses(or_options_t *options, int validate_only,
                                    char **msg);
static void config_maybe_load_geoip_files_(const or_options_t *options,
                                           const or_options_t *old_options);
static int options_validate_cb(void *old_options, void *options,
                               void *default_options,
                               int from_setconf, char **msg);
static void options_free_cb(void *options);
static void cleanup_protocol_warning_severity_level(void);
static void set_protocol_warning_severity_level(int warning_severity);

#define OR_OPTIONS_MAGIC 9090909

STATIC config_format_t options_format = {
  sizeof(or_options_t),
  OR_OPTIONS_MAGIC,
  offsetof(or_options_t, magic_),
  option_abbrevs_,
  option_deprecation_notes_,
  option_vars_,
  options_validate_cb,
  options_free_cb,
  NULL
};

/*
 * Functions to read and write the global options pointer.
 */

static or_options_t *global_options = NULL;
static or_options_t *global_default_options = NULL;
static char *torrc_fname = NULL;
static char *torrc_defaults_fname = NULL;
static config_line_t *global_cmdline_options = NULL;
static config_line_t *global_cmdline_only_options = NULL;
static int have_parsed_cmdline = 0;
static char *global_dirfrontpagecontents = NULL;
static smartlist_t *configured_ports = NULL;
static int in_option_validation = 0;
/* True iff we've initialized libevent */
static int libevent_initialized = 0;

MOCK_IMPL(const char*,
get_dirportfrontpage, (void))
{
  return global_dirfrontpagecontents;
}

MOCK_IMPL(or_options_t *,
get_options_mutable, (void))
{
  tor_assert(global_options);
  tor_assert_nonfatal(! in_option_validation);
  return global_options;
}

MOCK_IMPL(const or_options_t *,
get_options,(void))
{
  return get_options_mutable();
}

int
set_options(or_options_t *new_val, char **msg)
{
  int i;
  smartlist_t *elements;
  config_line_t *line;
  or_options_t *old_options = global_options;
  global_options = new_val;
  /* Note that we pass the *old* options below, for comparison. It
   * pulls the new options directly out of global_options. */
  if (options_act_reversible(old_options, msg)<0) {
    tor_assert(*msg);
    global_options = old_options;
    return -1;
  }
  if (options_act(old_options) < 0) { /* acting on the options failed. die. */
    if (! tor_event_loop_shutdown_is_pending()) {
      log_err(LD_BUG,
              "Acting on config options left us in a broken state. Dying.");
      tor_shutdown_event_loop_and_exit(1);
    }
    global_options = old_options;
    return -1;
  }
  /* Issues a CONF_CHANGED event to notify controller of the change. If Tor is
   * just starting up then the old_options will be undefined. */
  if (old_options && old_options != global_options) {
    elements = smartlist_new();
    for (i=0; options_format.vars[i].name; ++i) {
      const config_var_t *var = &options_format.vars[i];
      const char *var_name = var->name;
      if (var->type == CONFIG_TYPE_LINELIST_S ||
          var->type == CONFIG_TYPE_OBSOLETE) {
        continue;
      }
      if (!config_is_same(&options_format, new_val, old_options, var_name)) {
        line = config_get_assigned_option(&options_format, new_val,
                                          var_name, 1);

        if (line) {
          config_line_t *next;
          for (; line; line = next) {
            next = line->next;
            smartlist_add(elements, line->key);
            smartlist_add(elements, line->value);
            tor_free(line);
          }
        } else {
          smartlist_add_strdup(elements, options_format.vars[i].name);
          smartlist_add(elements, NULL);
        }
      }
    }
    control_event_conf_changed(elements);
    SMARTLIST_FOREACH(elements, char *, cp, tor_free(cp));
    smartlist_free(elements);
  }

  if (old_options != global_options) {
    or_options_free(old_options);
    /* If we are here it means we've successfully applied the new options and
     * that the global options have been changed to the new values. We'll
     * check if we need to remove or add periodic events. */
    periodic_events_on_new_options(global_options);
  }

  return 0;
}

STATIC void
or_options_free_(or_options_t *options)
{
  if (!options)
    return;

  routerset_free(options->ExcludeExitNodesUnion_);
  if (options->NodeFamilySets) {
    SMARTLIST_FOREACH(options->NodeFamilySets, routerset_t *,
                      rs, routerset_free(rs));
    smartlist_free(options->NodeFamilySets);
  }
  if (options->SchedulerTypes_) {
    SMARTLIST_FOREACH(options->SchedulerTypes_, int *, i, tor_free(i));
    smartlist_free(options->SchedulerTypes_);
  }
  if (options->FilesOpenedByIncludes) {
    SMARTLIST_FOREACH(options->FilesOpenedByIncludes, char *, f, tor_free(f));
    smartlist_free(options->FilesOpenedByIncludes);
  }
  tor_free(options->DataDirectory);
  tor_free(options->CacheDirectory);
  tor_free(options->KeyDirectory);
  tor_free(options->BridgePassword_AuthDigest_);
  tor_free(options->command_arg);
  tor_free(options->master_key_fname);
  config_free_lines(options->MyFamily);
  config_free(&options_format, options);
}

void
config_free_all(void)
{
  or_options_free(global_options);
  global_options = NULL;
  or_options_free(global_default_options);
  global_default_options = NULL;

  config_free_lines(global_cmdline_options);
  global_cmdline_options = NULL;

  config_free_lines(global_cmdline_only_options);
  global_cmdline_only_options = NULL;

  if (configured_ports) {
    SMARTLIST_FOREACH(configured_ports,
                      port_cfg_t *, p, port_cfg_free(p));
    smartlist_free(configured_ports);
    configured_ports = NULL;
  }

  tor_free(torrc_fname);
  tor_free(torrc_defaults_fname);
  tor_free(global_dirfrontpagecontents);

  cleanup_protocol_warning_severity_level();

  have_parsed_cmdline = 0;
  libevent_initialized = 0;
}

const char *
safe_str_client(const char *address)
{
  tor_assert(address);
  if (get_options()->SafeLogging_ == SAFELOG_SCRUB_ALL)
    return "[scrubbed]";
  else
    return address;
}

const char *
safe_str(const char *address)
{
  tor_assert(address);
  if (get_options()->SafeLogging_ != SAFELOG_SCRUB_NONE)
    return "[scrubbed]";
  else
    return address;
}

const char *
escaped_safe_str_client(const char *address)
{
  if (get_options()->SafeLogging_ == SAFELOG_SCRUB_ALL)
    return "[scrubbed]";
  else
    return escaped(address);
}

const char *
escaped_safe_str(const char *address)
{
  if (get_options()->SafeLogging_ != SAFELOG_SCRUB_NONE)
    return "[scrubbed]";
  else
    return escaped(address);
}

static atomic_counter_t protocol_warning_severity_level;

int
get_protocol_warning_severity_level(void)
{
  return (int) atomic_counter_get(&protocol_warning_severity_level);
}

static void
set_protocol_warning_severity_level(int warning_severity)
{
  atomic_counter_exchange(&protocol_warning_severity_level,
                          warning_severity);
}

void
init_protocol_warning_severity_level(void)
{
  atomic_counter_init(&protocol_warning_severity_level);
  set_protocol_warning_severity_level(LOG_WARN);
}

static void
cleanup_protocol_warning_severity_level(void)
{
   atomic_counter_destroy(&protocol_warning_severity_level);
}

static const char *default_authorities[] = {
#include "auth_dirs.inc"
  NULL
};

static const char *default_fallbacks[] = {
#include "fallback_dirs.inc"
  NULL
};

STATIC void
add_default_trusted_dir_authorities(dirinfo_type_t type)
{
  int i;
  for (i=0; default_authorities[i]; i++) {
    if (parse_dir_authority_line(default_authorities[i], type, 0)<0) {
      log_err(LD_BUG, "Couldn't parse internal DirAuthority line %s",
              default_authorities[i]);
    }
  }
}

MOCK_IMPL(void,
add_default_fallback_dir_servers,(void))
{
  int i;
  for (i=0; default_fallbacks[i]; i++) {
    if (parse_dir_fallback_line(default_fallbacks[i], 0)<0) {
      log_err(LD_BUG, "Couldn't parse internal FallbackDir line %s",
              default_fallbacks[i]);
    }
  }
}

static int
validate_dir_servers(or_options_t *options, or_options_t *old_options)
{
  config_line_t *cl;

  if (options->DirAuthorities &&
      (options->AlternateDirAuthority || options->AlternateBridgeAuthority)) {
    log_warn(LD_CONFIG,
             "You cannot set both DirAuthority and Alternate*Authority.");
    return -1;
  }

  /* do we want to complain to the user about being partitionable? */
  if ((options->DirAuthorities &&
       (!old_options ||
        !config_lines_eq(options->DirAuthorities,
                         old_options->DirAuthorities))) ||
      (options->AlternateDirAuthority &&
       (!old_options ||
        !config_lines_eq(options->AlternateDirAuthority,
                         old_options->AlternateDirAuthority)))) {
    log_warn(LD_CONFIG,
             "You have used DirAuthority or AlternateDirAuthority to "
             "specify alternate directory authorities in "
             "your configuration. This is potentially dangerous: it can "
             "make you look different from all other Tor users, and hurt "
             "your anonymity. Even if you've specified the same "
             "authorities as Tor uses by default, the defaults could "
             "change in the future. Be sure you know what you're doing.");
  }

  /* Now go through the four ways you can configure an alternate
   * set of directory authorities, and make sure none are broken. */
  for (cl = options->DirAuthorities; cl; cl = cl->next)
    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
      return -1;
  for (cl = options->AlternateBridgeAuthority; cl; cl = cl->next)
    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
      return -1;
  for (cl = options->AlternateDirAuthority; cl; cl = cl->next)
    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
      return -1;
  for (cl = options->FallbackDir; cl; cl = cl->next)
    if (parse_dir_fallback_line(cl->value, 1)<0)
      return -1;
  return 0;
}

int
consider_adding_dir_servers(const or_options_t *options,
                            const or_options_t *old_options)
{
  config_line_t *cl;
  int need_to_update =
    !smartlist_len(router_get_trusted_dir_servers()) ||
    !smartlist_len(router_get_fallback_dir_servers()) || !old_options ||
    !config_lines_eq(options->DirAuthorities, old_options->DirAuthorities) ||
    !config_lines_eq(options->FallbackDir, old_options->FallbackDir) ||
    (options->UseDefaultFallbackDirs != old_options->UseDefaultFallbackDirs) ||
    !config_lines_eq(options->AlternateBridgeAuthority,
                     old_options->AlternateBridgeAuthority) ||
    !config_lines_eq(options->AlternateDirAuthority,
                     old_options->AlternateDirAuthority);

  if (!need_to_update)
    return 0; /* all done */

  /* "You cannot set both DirAuthority and Alternate*Authority."
   * Checking that this restriction holds allows us to simplify
   * the unit tests. */
  tor_assert(!(options->DirAuthorities &&
               (options->AlternateDirAuthority
                || options->AlternateBridgeAuthority)));

  /* Start from a clean slate. */
  clear_dir_servers();

  if (!options->DirAuthorities) {
    /* then we may want some of the defaults */
    dirinfo_type_t type = NO_DIRINFO;
    if (!options->AlternateBridgeAuthority) {
      type |= BRIDGE_DIRINFO;
    }
    if (!options->AlternateDirAuthority) {
      type |= V3_DIRINFO | EXTRAINFO_DIRINFO | MICRODESC_DIRINFO;
      /* Only add the default fallback directories when the DirAuthorities,
       * AlternateDirAuthority, and FallbackDir directory config options
       * are set to their defaults, and when UseDefaultFallbackDirs is 1. */
      if (!options->FallbackDir && options->UseDefaultFallbackDirs) {
        add_default_fallback_dir_servers();
      }
    }
    /* if type == NO_DIRINFO, we don't want to add any of the
     * default authorities, because we've replaced them all */
    if (type != NO_DIRINFO)
      add_default_trusted_dir_authorities(type);
  }

  for (cl = options->DirAuthorities; cl; cl = cl->next)
    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
      return -1;
  for (cl = options->AlternateBridgeAuthority; cl; cl = cl->next)
    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
      return -1;
  for (cl = options->AlternateDirAuthority; cl; cl = cl->next)
    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
      return -1;
  for (cl = options->FallbackDir; cl; cl = cl->next)
    if (parse_dir_fallback_line(cl->value, 0)<0)
      return -1;
  return 0;
}

static int
check_and_create_data_directory(int create,
                                const char *directory,
                                int group_readable,
                                const char *owner,
                                char **msg_out)
{
  cpd_check_t cpd_opts = create ? CPD_CREATE : CPD_CHECK;
  if (group_readable)
      cpd_opts |= CPD_GROUP_READ;
  if (check_private_dir(directory,
                        cpd_opts,
                        owner) < 0) {
    tor_asprintf(msg_out,
                 "Couldn't %s private data directory \"%s\"",
                 create ? "create" : "access",
                 directory);
    return -1;
  }

#ifndef _WIN32
  if (group_readable) {
    /* Only new dirs created get new opts, also enforce group read. */
    if (chmod(directory, 0750)) {
      log_warn(LD_FS,"Unable to make %s group-readable: %s",
               directory, strerror(errno));
    }
  }
#endif /* !defined(_WIN32) */

  return 0;
}

int
create_keys_directory(const or_options_t *options)
{
  /* Make sure DataDirectory exists, and is private. */
  cpd_check_t cpd_opts = CPD_CREATE;
  if (options->DataDirectoryGroupReadable)
    cpd_opts |= CPD_GROUP_READ;
  if (check_private_dir(options->DataDirectory, cpd_opts, options->User)) {
    log_err(LD_OR, "Can't create/check datadirectory %s",
            options->DataDirectory);
    return -1;
  }

  /* Check the key directory. */
  if (check_private_dir(options->KeyDirectory, CPD_CREATE, options->User)) {
    return -1;
  }
  return 0;
}

/* Helps determine flags to pass to switch_id. */
static int have_low_ports = -1;

static int
options_act_reversible(const or_options_t *old_options, char **msg)
{
  smartlist_t *new_listeners = smartlist_new();
  or_options_t *options = get_options_mutable();
  int running_tor = options->command == CMD_RUN_TOR;
  int set_conn_limit = 0;
  int r = -1;
  int logs_marked = 0, logs_initialized = 0;
  int old_min_log_level = get_min_log_level();

  /* Daemonize _first_, since we only want to open most of this stuff in
   * the subprocess.  Libevent bases can't be reliably inherited across
   * processes. */
  if (running_tor && options->RunAsDaemon) {
    if (! start_daemon_has_been_called())
      subsystems_prefork();
    /* No need to roll back, since you can't change the value. */
    if (start_daemon())
      subsystems_postfork();
  }

#ifdef HAVE_SYSTEMD
  /* Our PID may have changed, inform supervisor */
  sd_notifyf(0, "MAINPID=%ld\n", (long int)getpid());
#endif

#ifndef HAVE_SYS_UN_H
  if (options->ControlSocket || options->ControlSocketsGroupWritable) {
    *msg = tor_strdup("Unix domain sockets (ControlSocket) not supported "
                      "on this OS/with this build.");
    goto rollback;
  }
#else /* !(!defined(HAVE_SYS_UN_H)) */
  if (options->ControlSocketsGroupWritable && !options->ControlSocket) {
    *msg = tor_strdup("Setting ControlSocketGroupWritable without setting"
                      "a ControlSocket makes no sense.");
    goto rollback;
  }
#endif /* !defined(HAVE_SYS_UN_H) */

  if (running_tor) {
    int n_ports=0;
    /* We need to set the connection limit before we can open the listeners. */
    if (! sandbox_is_active()) {
      if (set_max_file_descriptors((unsigned)options->ConnLimit,
                                   &options->ConnLimit_) < 0) {
        *msg = tor_strdup("Problem with ConnLimit value. "
                          "See logs for details.");
        goto rollback;
      }
      set_conn_limit = 1;
    } else {
      tor_assert(old_options);
      options->ConnLimit_ = old_options->ConnLimit_;
    }

    /* Set up libevent.  (We need to do this before we can register the
     * listeners as listeners.) */
    if (running_tor && !libevent_initialized) {
      init_libevent(options);
      libevent_initialized = 1;

      /* This has to come up after libevent is initialized. */
      control_initialize_event_queue();

      /*
       * Initialize the scheduler - this has to come after
       * options_init_from_torrc() sets up libevent - why yes, that seems
       * completely sensible to hide the libevent setup in the option parsing
       * code!  It also needs to happen before init_keys(), so it needs to
       * happen here too.  How yucky. */
      scheduler_init();
    }

    /* Adjust the port configuration so we can launch listeners. */
    if (parse_ports(options, 0, msg, &n_ports, NULL)) {
      if (!*msg)
        *msg = tor_strdup("Unexpected problem parsing port config");
      goto rollback;
    }

    /* Set the hibernation state appropriately.*/
    consider_hibernation(time(NULL));

    /* Launch the listeners.  (We do this before we setuid, so we can bind to
     * ports under 1024.)  We don't want to rebind if we're hibernating or
     * shutting down. If networking is disabled, this will close all but the
     * control listeners, but disable those. */
    if (!we_are_hibernating()) {
      if (retry_all_listeners(new_listeners, options->DisableNetwork) < 0) {
        *msg = tor_strdup("Failed to bind one of the listener ports.");
        goto rollback;
      }
    }
    if (options->DisableNetwork) {
      /* Aggressively close non-controller stuff, NOW */
      log_notice(LD_NET, "DisableNetwork is set. Tor will not make or accept "
                 "non-control network connections. Shutting down all existing "
                 "connections.");
      connection_mark_all_noncontrol_connections();
      /* We can't complete circuits until the network is re-enabled. */
      note_that_we_maybe_cant_complete_circuits();
    }
  }

#if defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H)
  /* Open /dev/pf before dropping privileges. */
  if (options->TransPort_set &&
      options->TransProxyType_parsed == TPT_DEFAULT) {
    if (get_pf_socket() < 0) {
      *msg = tor_strdup("Unable to open /dev/pf for transparent proxy.");
      goto rollback;
    }
  }
#endif /* defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H) */

  /* Attempt to lock all current and future memory with mlockall() only once */
  if (options->DisableAllSwap) {
    if (tor_mlockall() == -1) {
      *msg = tor_strdup("DisableAllSwap failure. Do you have proper "
                        "permissions?");
      goto done;
    }
  }

  /* Setuid/setgid as appropriate */
  if (options->User) {
    tor_assert(have_low_ports != -1);
    unsigned switch_id_flags = 0;
    if (options->KeepBindCapabilities == 1) {
      switch_id_flags |= SWITCH_ID_KEEP_BINDLOW;
      switch_id_flags |= SWITCH_ID_WARN_IF_NO_CAPS;
    }
    if (options->KeepBindCapabilities == -1 && have_low_ports) {
      switch_id_flags |= SWITCH_ID_KEEP_BINDLOW;
    }
    if (switch_id(options->User, switch_id_flags) != 0) {
      /* No need to roll back, since you can't change the value. */
      *msg = tor_strdup("Problem with User value. See logs for details.");
      goto done;
    }
  }

  /* Ensure data directory is private; create if possible. */
  /* It's okay to do this in "options_act_reversible()" even though it isn't
   * actually reversible, since you can't change the DataDirectory while
   * Tor is running. */
  if (check_and_create_data_directory(running_tor /* create */,
                                      options->DataDirectory,
                                      options->DataDirectoryGroupReadable,
                                      options->User,
                                      msg) < 0) {
    goto done;
  }
  if (check_and_create_data_directory(running_tor /* create */,
                                      options->KeyDirectory,
                                      options->KeyDirectoryGroupReadable,
                                      options->User,
                                      msg) < 0) {
    goto done;
  }

  /* We need to handle the group-readable flag for the cache directory
   * specially, since the directory defaults to being the same as the
   * DataDirectory. */
  int cache_dir_group_readable;
  if (options->CacheDirectoryGroupReadable != -1) {
    /* If the user specified a value, use their setting */
    cache_dir_group_readable = options->CacheDirectoryGroupReadable;
  } else if (!strcmp(options->CacheDirectory, options->DataDirectory)) {
    /* If the user left the value as "auto", and the cache is the same as the
     * datadirectory, use the datadirectory setting.
     */
    cache_dir_group_readable = options->DataDirectoryGroupReadable;
  } else {
    /* Otherwise, "auto" means "not group readable". */
    cache_dir_group_readable = 0;
  }
  if (check_and_create_data_directory(running_tor /* create */,
                                      options->CacheDirectory,
                                      cache_dir_group_readable,
                                      options->User,
                                      msg) < 0) {
    goto done;
  }

  /* Bail out at this point if we're not going to be a client or server:
   * we don't run Tor itself. */
  if (!running_tor)
    goto commit;

  mark_logs_temp(); /* Close current logs once new logs are open. */
  logs_marked = 1;
  /* Configure the tor_log(s) */
  if (options_init_logs(old_options, options, 0)<0) {
    *msg = tor_strdup("Failed to init Log options. See logs for details.");
    goto rollback;
  }
  logs_initialized = 1;

 commit:
  r = 0;
  if (logs_marked) {
    log_severity_list_t *severity =
      tor_malloc_zero(sizeof(log_severity_list_t));
    close_temp_logs();
    add_callback_log(severity, control_event_logmsg);
    logs_set_pending_callback_callback(control_event_logmsg_pending);
    control_adjust_event_log_severity();
    tor_free(severity);
    tor_log_update_sigsafe_err_fds();
  }
  if (logs_initialized) {
    flush_log_messages_from_startup();
  }

  {
    const char *badness = NULL;
    int bad_safelog = 0, bad_severity = 0, new_badness = 0;
    if (options->SafeLogging_ != SAFELOG_SCRUB_ALL) {
      bad_safelog = 1;
      if (!old_options || old_options->SafeLogging_ != options->SafeLogging_)
        new_badness = 1;
    }
    if (get_min_log_level() >= LOG_INFO) {
      bad_severity = 1;
      if (get_min_log_level() != old_min_log_level)
        new_badness = 1;
    }
    if (bad_safelog && bad_severity)
      badness = "you disabled SafeLogging, and "
        "you're logging more than \"notice\"";
    else if (bad_safelog)
      badness = "you disabled SafeLogging";
    else
      badness = "you're logging more than \"notice\"";
    if (new_badness)
      log_warn(LD_GENERAL, "Your log may contain sensitive information - %s. "
               "Don't log unless it serves an important reason. "
               "Overwrite the log afterwards.", badness);
  }

  if (set_conn_limit) {
    /*
     * If we adjusted the conn limit, recompute the OOS threshold too
     *
     * How many possible sockets to keep in reserve?  If we have lots of
     * possible sockets, keep this below a limit and set ConnLimit_high_thresh
     * very close to ConnLimit_, but if ConnLimit_ is low, shrink it in
     * proportion.
     *
     * Somewhat arbitrarily, set socks_in_reserve to 5% of ConnLimit_, but
     * cap it at 64.
     */
    int socks_in_reserve = options->ConnLimit_ / 20;
    if (socks_in_reserve > 64) socks_in_reserve = 64;

    options->ConnLimit_high_thresh = options->ConnLimit_ - socks_in_reserve;
    options->ConnLimit_low_thresh = (options->ConnLimit_ / 4) * 3;
    log_info(LD_GENERAL,
             "Recomputed OOS thresholds: ConnLimit %d, ConnLimit_ %d, "
             "ConnLimit_high_thresh %d, ConnLimit_low_thresh %d",
             options->ConnLimit, options->ConnLimit_,
             options->ConnLimit_high_thresh,
             options->ConnLimit_low_thresh);

    /* Give the OOS handler a chance with the new thresholds */
    connection_check_oos(get_n_open_sockets(), 0);
  }

  goto done;

 rollback:
  r = -1;
  tor_assert(*msg);

  if (logs_marked) {
    rollback_log_changes();
    control_adjust_event_log_severity();
  }

  if (set_conn_limit && old_options)
    set_max_file_descriptors((unsigned)old_options->ConnLimit,
                             &options->ConnLimit_);

  SMARTLIST_FOREACH(new_listeners, connection_t *, conn,
  {
    log_notice(LD_NET, "Closing partially-constructed %s on %s:%d",
               conn_type_to_string(conn->type), conn->address, conn->port);
    connection_close_immediate(conn);
    connection_mark_for_close(conn);
  });

 done:
  smartlist_free(new_listeners);
  return r;
}

int
options_need_geoip_info(const or_options_t *options, const char **reason_out)
{
  int bridge_usage = should_record_bridge_info(options);
  int routerset_usage =
    routerset_needs_geoip(options->EntryNodes) ||
    routerset_needs_geoip(options->ExitNodes) ||
    routerset_needs_geoip(options->MiddleNodes) ||
    routerset_needs_geoip(options->ExcludeExitNodes) ||
    routerset_needs_geoip(options->ExcludeNodes) ||
    routerset_needs_geoip(options->HSLayer2Nodes) ||
    routerset_needs_geoip(options->HSLayer3Nodes);

  if (routerset_usage && reason_out) {
    *reason_out = "We've been configured to use (or avoid) nodes in certain "
      "countries, and we need GEOIP information to figure out which ones they "
      "are.";
  } else if (bridge_usage && reason_out) {
    *reason_out = "We've been configured to see which countries can access "
      "us as a bridge, and we need GEOIP information to tell which countries "
      "clients are in.";
  }
  return bridge_usage || routerset_usage;
}

uint32_t
get_effective_bwrate(const or_options_t *options)
{
  uint64_t bw = options->BandwidthRate;
  if (bw > options->MaxAdvertisedBandwidth)
    bw = options->MaxAdvertisedBandwidth;
  if (options->RelayBandwidthRate > 0 && bw > options->RelayBandwidthRate)
    bw = options->RelayBandwidthRate;
  /* ensure_bandwidth_cap() makes sure that this cast can't overflow. */
  return (uint32_t)bw;
}

uint32_t
get_effective_bwburst(const or_options_t *options)
{
  uint64_t bw = options->BandwidthBurst;
  if (options->RelayBandwidthBurst > 0 && bw > options->RelayBandwidthBurst)
    bw = options->RelayBandwidthBurst;
  /* ensure_bandwidth_cap() makes sure that this cast can't overflow. */
  return (uint32_t)bw;
}

/* Used in the various options_transition_affects* functions. */
#define YES_IF_CHANGED_BOOL(opt) \
  if (!CFG_EQ_BOOL(old_options, new_options, opt)) return 1;
#define YES_IF_CHANGED_INT(opt) \
  if (!CFG_EQ_INT(old_options, new_options, opt)) return 1;
#define YES_IF_CHANGED_STRING(opt) \
  if (!CFG_EQ_STRING(old_options, new_options, opt)) return 1;
#define YES_IF_CHANGED_LINELIST(opt) \
  if (!CFG_EQ_LINELIST(old_options, new_options, opt)) return 1;
#define YES_IF_CHANGED_SMARTLIST(opt) \
  if (!CFG_EQ_SMARTLIST(old_options, new_options, opt)) return 1;
#define YES_IF_CHANGED_ROUTERSET(opt) \
  if (!CFG_EQ_ROUTERSET(old_options, new_options, opt)) return 1;

static int
options_transition_affects_guards(const or_options_t *old_options,
                                  const or_options_t *new_options)
{
  /* NOTE: Make sure this function stays in sync with
   * node_passes_guard_filter */
  tor_assert(old_options);
  tor_assert(new_options);

  YES_IF_CHANGED_BOOL(UseEntryGuards);
  YES_IF_CHANGED_BOOL(UseBridges);
  YES_IF_CHANGED_BOOL(ClientUseIPv4);
  YES_IF_CHANGED_BOOL(ClientUseIPv6);
  YES_IF_CHANGED_BOOL(FascistFirewall);
  YES_IF_CHANGED_ROUTERSET(ExcludeNodes);
  YES_IF_CHANGED_ROUTERSET(EntryNodes);
  YES_IF_CHANGED_SMARTLIST(FirewallPorts);
  YES_IF_CHANGED_LINELIST(Bridges);
  YES_IF_CHANGED_LINELIST(ReachableORAddresses);
  YES_IF_CHANGED_LINELIST(ReachableDirAddresses);

  return 0;
}

static int
options_transition_affects_dirauth_timing(const or_options_t *old_options,
                                          const or_options_t *new_options)
{
  tor_assert(old_options);
  tor_assert(new_options);

  if (authdir_mode_v3(old_options) != authdir_mode_v3(new_options))
    return 1;
  if (! authdir_mode_v3(new_options))
    return 0;
  YES_IF_CHANGED_INT(V3AuthVotingInterval);
  YES_IF_CHANGED_INT(V3AuthVoteDelay);
  YES_IF_CHANGED_INT(V3AuthDistDelay);
  YES_IF_CHANGED_INT(TestingV3AuthInitialVotingInterval);
  YES_IF_CHANGED_INT(TestingV3AuthInitialVoteDelay);
  YES_IF_CHANGED_INT(TestingV3AuthInitialDistDelay);
  YES_IF_CHANGED_INT(TestingV3AuthVotingStartOffset);

  return 0;
}

STATIC int
options_act(const or_options_t *old_options)
{
  config_line_t *cl;
  or_options_t *options = get_options_mutable();
  int running_tor = options->command == CMD_RUN_TOR;
  char *msg=NULL;
  const int transition_affects_workers =
    old_options && options_transition_affects_workers(old_options, options);
  const int transition_affects_guards =
    old_options && options_transition_affects_guards(old_options, options);

  if (options->NoExec || options->Sandbox) {
    tor_disable_spawning_background_processes();
  }

  /* disable ptrace and later, other basic debugging techniques */
  {
    /* Remember if we already disabled debugger attachment */
    static int disabled_debugger_attach = 0;
    /* Remember if we already warned about being configured not to disable
     * debugger attachment */
    static int warned_debugger_attach = 0;
    /* Don't disable debugger attachment when we're running the unit tests. */
    if (options->DisableDebuggerAttachment && !disabled_debugger_attach &&
        running_tor) {
      int ok = tor_disable_debugger_attach();
      /* LCOV_EXCL_START the warned_debugger_attach is 0 can't reach inside. */
      if (warned_debugger_attach && ok == 1) {
        log_notice(LD_CONFIG, "Disabled attaching debuggers for unprivileged "
                   "users.");
      }
      /* LCOV_EXCL_STOP */
      disabled_debugger_attach = (ok == 1);
    } else if (!options->DisableDebuggerAttachment &&
               !warned_debugger_attach) {
      log_notice(LD_CONFIG, "Not disabling debugger attaching for "
                 "unprivileged users.");
      warned_debugger_attach = 1;
    }
  }

  /* Write control ports to disk as appropriate */
  control_ports_write_to_file();

  if (running_tor && !have_lockfile()) {
    if (try_locking(options, 1) < 0)
      return -1;
  }

  {
    int warning_severity = options->ProtocolWarnings ? LOG_WARN : LOG_INFO;
    set_protocol_warning_severity_level(warning_severity);
  }

  if (consider_adding_dir_servers(options, old_options) < 0) {
    // XXXX This should get validated earlier, and committed here, to
    // XXXX lower opportunities for reaching an error case.
    return -1;
  }

  if (rend_non_anonymous_mode_enabled(options)) {
    log_warn(LD_GENERAL, "This copy of Tor was compiled or configured to run "
             "in a non-anonymous mode. It will provide NO ANONYMITY.");
  }

  /* If we are a bridge with a pluggable transport proxy but no
     Extended ORPort, inform the user that they are missing out. */
  if (server_mode(options) && options->ServerTransportPlugin &&
      !options->ExtORPort_lines) {
    log_notice(LD_CONFIG, "We use pluggable transports but the Extended "
               "ORPort is disabled. Tor and your pluggable transports proxy "
               "communicate with each other via the Extended ORPort so it "
               "is suggested you enable it: it will also allow your Bridge "
               "to collect statistics about its clients that use pluggable "
               "transports. Please enable it using the ExtORPort torrc option "
               "(e.g. set 'ExtORPort auto').");
  }

  if (options->Bridges) {
    mark_bridge_list();
    for (cl = options->Bridges; cl; cl = cl->next) {
      bridge_line_t *bridge_line = parse_bridge_line(cl->value);
      if (!bridge_line) {
        // LCOV_EXCL_START
        log_warn(LD_BUG,
                 "Previously validated Bridge line could not be added!");
        return -1;
        // LCOV_EXCL_STOP
      }
      bridge_add_from_config(bridge_line);
    }
    sweep_bridge_list();
  }

  if (running_tor && hs_config_service_all(options, 0)<0) {
    // LCOV_EXCL_START
    log_warn(LD_BUG,
       "Previously validated hidden services line could not be added!");
    return -1;
    // LCOV_EXCL_STOP
  }

  if (running_tor && hs_config_client_auth_all(options, 0) < 0) {
    // LCOV_EXCL_START
    log_warn(LD_BUG, "Previously validated client authorization for "
                     "hidden services could not be added!");
    return -1;
    // LCOV_EXCL_STOP
  }

  if (running_tor && !old_options &&
      options->OwningControllerFD != UINT64_MAX) {
    const unsigned ctrl_flags =
      CC_LOCAL_FD_IS_OWNER |
      CC_LOCAL_FD_IS_AUTHENTICATED;
    tor_socket_t ctrl_sock = (tor_socket_t)options->OwningControllerFD;
    if (control_connection_add_local_fd(ctrl_sock, ctrl_flags) < 0) {
      log_warn(LD_CONFIG, "Could not add local controller connection with "
               "given FD.");
      return -1;
    }
  }

  /* Load state */
  if (! or_state_loaded() && running_tor) {
    if (or_state_load())
      return -1;
    rep_hist_load_mtbf_data(time(NULL));
  }

  /* If we have an ExtORPort, initialize its auth cookie. */
  if (running_tor &&
      init_ext_or_cookie_authentication(!!options->ExtORPort_lines) < 0) {
    log_warn(LD_CONFIG,"Error creating Extended ORPort cookie file.");
    return -1;
  }

  mark_transport_list();
  pt_prepare_proxy_list_for_config_read();
  if (!options->DisableNetwork) {
    if (options->ClientTransportPlugin) {
      for (cl = options->ClientTransportPlugin; cl; cl = cl->next) {
        if (parse_transport_line(options, cl->value, 0, 0) < 0) {
          // LCOV_EXCL_START
          log_warn(LD_BUG,
                   "Previously validated ClientTransportPlugin line "
                   "could not be added!");
          return -1;
          // LCOV_EXCL_STOP
        }
      }
    }

    if (options->ServerTransportPlugin && server_mode(options)) {
      for (cl = options->ServerTransportPlugin; cl; cl = cl->next) {
        if (parse_transport_line(options, cl->value, 0, 1) < 0) {
          // LCOV_EXCL_START
          log_warn(LD_BUG,
                   "Previously validated ServerTransportPlugin line "
                   "could not be added!");
          return -1;
          // LCOV_EXCL_STOP
        }
      }
    }
  }
  sweep_transport_list();
  sweep_proxy_list();

  /* Start the PT proxy configuration. By doing this configuration
     here, we also figure out which proxies need to be restarted and
     which not. */
  if (pt_proxies_configuration_pending() && !net_is_disabled())
    pt_configure_remaining_proxies();

  /* Bail out at this point if we're not going to be a client or server:
   * we want to not fork, and to log stuff to stderr. */
  if (!running_tor)
    return 0;

  /* Finish backgrounding the process */
  if (options->RunAsDaemon) {
    /* We may be calling this for the n'th time (on SIGHUP), but it's safe. */
    finish_daemon(options->DataDirectory);
  }

  /* We want to reinit keys as needed before we do much of anything else:
     keys are important, and other things can depend on them. */
  if (transition_affects_workers ||
      (options->V3AuthoritativeDir && (!old_options ||
                                       !old_options->V3AuthoritativeDir))) {
    if (init_keys() < 0) {
      log_warn(LD_BUG,"Error initializing keys; exiting");
      return -1;
    }
  }

  /* Write our PID to the PID file. If we do not have write permissions we
   * will log a warning and exit. */
  if (options->PidFile && !sandbox_is_active()) {
    if (write_pidfile(options->PidFile) < 0) {
      log_err(LD_CONFIG, "Unable to write PIDFile %s",
              escaped(options->PidFile));
      return -1;
    }
  }

  /* Register addressmap directives */
  config_register_addressmaps(options);
  parse_virtual_addr_network(options->VirtualAddrNetworkIPv4, AF_INET,0,NULL);
  parse_virtual_addr_network(options->VirtualAddrNetworkIPv6, AF_INET6,0,NULL);

  /* Update address policies. */
  if (policies_parse_from_options(options) < 0) {
    /* This should be impossible, but let's be sure. */
    log_warn(LD_BUG,"Error parsing already-validated policy options.");
    return -1;
  }

  if (server_mode(options)) {
    static int cdm_initialized = 0;
    if (cdm_initialized == 0) {
      cdm_initialized = 1;
      consdiffmgr_configure(NULL);
      consdiffmgr_validate();
    }
  }

  if (init_control_cookie_authentication(options->CookieAuthentication) < 0) {
    log_warn(LD_CONFIG,"Error creating control cookie authentication file.");
    return -1;
  }

  monitor_owning_controller_process(options->OwningControllerProcess);

  /* reload keys as needed for rendezvous services. */
  if (hs_service_load_all_keys() < 0) {
    log_warn(LD_GENERAL,"Error loading rendezvous service keys");
    return -1;
  }

  /* Inform the scheduler subsystem that a configuration changed happened. It
   * might be a change of scheduler or parameter. */
  scheduler_conf_changed();

  /* Set up accounting */
  if (accounting_parse_options(options, 0)<0) {
    // LCOV_EXCL_START
    log_warn(LD_BUG,"Error in previously validated accounting options");
    return -1;
    // LCOV_EXCL_STOP
  }
  if (accounting_is_enabled(options))
    configure_accounting(time(NULL));

  /* Change the cell EWMA settings */
  cmux_ewma_set_options(options, networkstatus_get_latest_consensus());

  /* Update the BridgePassword's hashed version as needed.  We store this as a
   * digest so that we can do side-channel-proof comparisons on it.
   */
  if (options->BridgePassword) {
    char *http_authenticator;
    http_authenticator = alloc_http_authenticator(options->BridgePassword);
    if (!http_authenticator) {
      // XXXX This should get validated in options_validate().
      log_warn(LD_BUG, "Unable to allocate HTTP authenticator. Not setting "
               "BridgePassword.");
      return -1;
    }
    options->BridgePassword_AuthDigest_ = tor_malloc(DIGEST256_LEN);
    crypto_digest256(options->BridgePassword_AuthDigest_,
                     http_authenticator, strlen(http_authenticator),
                     DIGEST_SHA256);
    tor_free(http_authenticator);
  }

  if (parse_outbound_addresses(options, 0, &msg) < 0) {
    // LCOV_EXCL_START
    log_warn(LD_BUG, "Failed parsing previously validated outbound "
             "bind addresses: %s", msg);
    tor_free(msg);
    return -1;
    // LCOV_EXCL_STOP
  }

  config_maybe_load_geoip_files_(options, old_options);

  if (geoip_is_loaded(AF_INET) && options->GeoIPExcludeUnknown) {
    /* ExcludeUnknown is true or "auto" */
    const int is_auto = options->GeoIPExcludeUnknown == -1;
    int changed;

    changed  = routerset_add_unknown_ccs(&options->ExcludeNodes, is_auto);
    changed += routerset_add_unknown_ccs(&options->ExcludeExitNodes, is_auto);

    if (changed)
      routerset_add_unknown_ccs(&options->ExcludeExitNodesUnion_, is_auto);
  }

  /* Check for transitions that need action. */
  if (old_options) {
    int revise_trackexithosts = 0;
    int revise_automap_entries = 0;
    int abandon_circuits = 0;
    if ((options->UseEntryGuards && !old_options->UseEntryGuards) ||
        options->UseBridges != old_options->UseBridges ||
        (options->UseBridges &&
         !config_lines_eq(options->Bridges, old_options->Bridges)) ||
        !routerset_equal(old_options->ExcludeNodes,options->ExcludeNodes) ||
        !routerset_equal(old_options->ExcludeExitNodes,
                         options->ExcludeExitNodes) ||
        !routerset_equal(old_options->EntryNodes, options->EntryNodes) ||
        !routerset_equal(old_options->ExitNodes, options->ExitNodes) ||
        !routerset_equal(old_options->HSLayer2Nodes,
                         options->HSLayer2Nodes) ||
        !routerset_equal(old_options->HSLayer3Nodes,
                         options->HSLayer3Nodes) ||
        !routerset_equal(old_options->MiddleNodes, options->MiddleNodes) ||
        options->StrictNodes != old_options->StrictNodes) {
      log_info(LD_CIRC,
               "Changed to using entry guards or bridges, or changed "
               "preferred or excluded node lists. "
               "Abandoning previous circuits.");
      abandon_circuits = 1;
    }

    if (transition_affects_guards) {
      if (guards_update_all()) {
        abandon_circuits = 1;
      }
    }

    if (abandon_circuits) {
      circuit_mark_all_unused_circs();
      circuit_mark_all_dirty_circs_as_unusable();
      revise_trackexithosts = 1;
    }

    if (!smartlist_strings_eq(old_options->TrackHostExits,
                              options->TrackHostExits))
      revise_trackexithosts = 1;

    if (revise_trackexithosts)
      addressmap_clear_excluded_trackexithosts(options);

    if (!options->AutomapHostsOnResolve &&
        old_options->AutomapHostsOnResolve) {
        revise_automap_entries = 1;
    } else {
      if (!smartlist_strings_eq(old_options->AutomapHostsSuffixes,
                                options->AutomapHostsSuffixes))
        revise_automap_entries = 1;
      else if (!opt_streq(old_options->VirtualAddrNetworkIPv4,
                          options->VirtualAddrNetworkIPv4) ||
               !opt_streq(old_options->VirtualAddrNetworkIPv6,
                          options->VirtualAddrNetworkIPv6))
        revise_automap_entries = 1;
    }

    if (revise_automap_entries)
      addressmap_clear_invalid_automaps(options);

/* How long should we delay counting bridge stats after becoming a bridge?
 * We use this so we don't count clients who used our bridge thinking it is
 * a relay. If you change this, don't forget to change the log message
 * below. It's 4 hours (the time it takes to stop being used by clients)
 * plus some extra time for clock skew. */
#define RELAY_BRIDGE_STATS_DELAY (6 * 60 * 60)

    if (! bool_eq(options->BridgeRelay, old_options->BridgeRelay)) {
      int was_relay = 0;
      if (options->BridgeRelay) {
        time_t int_start = time(NULL);
        if (config_lines_eq(old_options->ORPort_lines,options->ORPort_lines)) {
          int_start += RELAY_BRIDGE_STATS_DELAY;
          was_relay = 1;
        }
        geoip_bridge_stats_init(int_start);
        log_info(LD_CONFIG, "We are acting as a bridge now.  Starting new "
                 "GeoIP stats interval%s.", was_relay ? " in 6 "
                 "hours from now" : "");
      } else {
        geoip_bridge_stats_term();
        log_info(LD_GENERAL, "We are no longer acting as a bridge.  "
                 "Forgetting GeoIP stats.");
      }
    }

    if (transition_affects_workers) {
      log_info(LD_GENERAL,
               "Worker-related options changed. Rotating workers.");
      const int server_mode_turned_on =
        server_mode(options) && !server_mode(old_options);
      const int dir_server_mode_turned_on =
        dir_server_mode(options) && !dir_server_mode(old_options);

      if (server_mode_turned_on || dir_server_mode_turned_on) {
        cpu_init();
      }

      if (server_mode_turned_on) {
        ip_address_changed(0);
        if (have_completed_a_circuit() || !any_predicted_circuits(time(NULL)))
          inform_testing_reachability();
      }
      cpuworkers_rotate_keyinfo();
      if (dns_reset())
        return -1;
    } else {
      if (dns_reset())
        return -1;
    }

    if (options->PerConnBWRate != old_options->PerConnBWRate ||
        options->PerConnBWBurst != old_options->PerConnBWBurst)
      connection_or_update_token_buckets(get_connection_array(), options);

    if (options->BandwidthRate != old_options->BandwidthRate ||
        options->BandwidthBurst != old_options->BandwidthBurst ||
        options->RelayBandwidthRate != old_options->RelayBandwidthRate ||
        options->RelayBandwidthBurst != old_options->RelayBandwidthBurst)
      connection_bucket_adjust(options);

    if (options->MainloopStats != old_options->MainloopStats) {
      reset_main_loop_counters();
    }
  }

  /* Only collect directory-request statistics on relays and bridges. */
  options->DirReqStatistics = options->DirReqStatistics_option &&
    server_mode(options);
  options->HiddenServiceStatistics =
    options->HiddenServiceStatistics_option && server_mode(options);

  if (options->CellStatistics || options->DirReqStatistics ||
      options->EntryStatistics || options->ExitPortStatistics ||
      options->ConnDirectionStatistics ||
      options->HiddenServiceStatistics ||
      options->BridgeAuthoritativeDir) {
    time_t now = time(NULL);
    int print_notice = 0;

    /* Only collect other relay-only statistics on relays. */
    if (!public_server_mode(options)) {
      options->CellStatistics = 0;
      options->EntryStatistics = 0;
      options->ConnDirectionStatistics = 0;
      options->ExitPortStatistics = 0;
    }

    if ((!old_options || !old_options->CellStatistics) &&
        options->CellStatistics) {
      rep_hist_buffer_stats_init(now);
      print_notice = 1;
    }
    if ((!old_options || !old_options->DirReqStatistics) &&
        options->DirReqStatistics) {
      if (geoip_is_loaded(AF_INET)) {
        geoip_dirreq_stats_init(now);
        print_notice = 1;
      } else {
        /* disable statistics collection since we have no geoip file */
        options->DirReqStatistics = 0;
        if (options->ORPort_set)
          log_notice(LD_CONFIG, "Configured to measure directory request "
                                "statistics, but no GeoIP database found. "
                                "Please specify a GeoIP database using the "
                                "GeoIPFile option.");
      }
    }
    if ((!old_options || !old_options->EntryStatistics) &&
        options->EntryStatistics && !should_record_bridge_info(options)) {
      /* If we get here, we've started recording bridge info when we didn't
       * do so before.  Note that "should_record_bridge_info()" will
       * always be false at this point, because of the earlier block
       * that cleared EntryStatistics when public_server_mode() was false.
       * We're leaving it in as defensive programming. */
      if (geoip_is_loaded(AF_INET) || geoip_is_loaded(AF_INET6)) {
        geoip_entry_stats_init(now);
        print_notice = 1;
      } else {
        options->EntryStatistics = 0;
        log_notice(LD_CONFIG, "Configured to measure entry node "
                              "statistics, but no GeoIP database found. "
                              "Please specify a GeoIP database using the "
                              "GeoIPFile option.");
      }
    }
    if ((!old_options || !old_options->ExitPortStatistics) &&
        options->ExitPortStatistics) {
      rep_hist_exit_stats_init(now);
      print_notice = 1;
    }
    if ((!old_options || !old_options->ConnDirectionStatistics) &&
        options->ConnDirectionStatistics) {
      rep_hist_conn_stats_init(now);
    }
    if ((!old_options || !old_options->HiddenServiceStatistics) &&
        options->HiddenServiceStatistics) {
      log_info(LD_CONFIG, "Configured to measure hidden service statistics.");
      rep_hist_hs_stats_init(now);
    }
    if ((!old_options || !old_options->BridgeAuthoritativeDir) &&
        options->BridgeAuthoritativeDir) {
      rep_hist_desc_stats_init(now);
      print_notice = 1;
    }
    if (print_notice)
        log_notice(LD_CONFIG, "Configured to measure statistics. Look for "
                "the *-stats files that will first be written to the "
                 "data directory in 24 hours from now.");
  }

  /* If we used to have statistics enabled but we just disabled them,
     stop gathering them.  */
  if (old_options && old_options->CellStatistics &&
      !options->CellStatistics)
    rep_hist_buffer_stats_term();
  if (old_options && old_options->DirReqStatistics &&
      !options->DirReqStatistics)
    geoip_dirreq_stats_term();
  if (old_options && old_options->EntryStatistics &&
      !options->EntryStatistics)
    geoip_entry_stats_term();
  if (old_options && old_options->HiddenServiceStatistics &&
      !options->HiddenServiceStatistics)
    rep_hist_hs_stats_term();
  if (old_options && old_options->ExitPortStatistics &&
      !options->ExitPortStatistics)
    rep_hist_exit_stats_term();
  if (old_options && old_options->ConnDirectionStatistics &&
      !options->ConnDirectionStatistics)
    rep_hist_conn_stats_term();
  if (old_options && old_options->BridgeAuthoritativeDir &&
      !options->BridgeAuthoritativeDir)
    rep_hist_desc_stats_term();

  /* Since our options changed, we might need to regenerate and upload our
   * server descriptor.
   */
  if (!old_options ||
      options_transition_affects_descriptor(old_options, options))
    mark_my_descriptor_dirty("config change");

  /* We may need to reschedule some directory stuff if our status changed. */
  if (old_options) {
    if (options_transition_affects_dirauth_timing(old_options, options)) {
      voting_schedule_recalculate_timing(options, time(NULL));
      reschedule_dirvote(options);
    }
    if (!bool_eq(directory_fetches_dir_info_early(options),
                 directory_fetches_dir_info_early(old_options)) ||
        !bool_eq(directory_fetches_dir_info_later(options),
                 directory_fetches_dir_info_later(old_options))) {
      /* Make sure update_router_have_minimum_dir_info() gets called. */
      router_dir_info_changed();
      /* We might need to download a new consensus status later or sooner than
       * we had expected. */
      update_consensus_networkstatus_fetch_time(time(NULL));
    }
  }

  /* DoS mitigation subsystem only applies to public relay. */
  if (public_server_mode(options)) {
    /* If we are configured as a relay, initialize the subsystem. Even on HUP,
     * this is safe to call as it will load data from the current options
     * or/and the consensus. */
    dos_init();
  } else if (old_options && public_server_mode(old_options)) {
    /* Going from relay to non relay, clean it up. */
    dos_free_all();
  }

  /* Load the webpage we're going to serve every time someone asks for '/' on
     our DirPort. */
  tor_free(global_dirfrontpagecontents);
  if (options->DirPortFrontPage) {
    global_dirfrontpagecontents =
      read_file_to_str(options->DirPortFrontPage, 0, NULL);
    if (!global_dirfrontpagecontents) {
      log_warn(LD_CONFIG,
               "DirPortFrontPage file '%s' not found. Continuing anyway.",
               options->DirPortFrontPage);
    }
  }

  return 0;
}

typedef enum {
  TAKES_NO_ARGUMENT = 0,
  ARGUMENT_NECESSARY = 1,
  ARGUMENT_OPTIONAL = 2
} takes_argument_t;

static const struct {
  const char *name;
  takes_argument_t takes_argument;
} CMDLINE_ONLY_OPTIONS[] = {
  { "-f",                     ARGUMENT_NECESSARY },
  { "--allow-missing-torrc",  TAKES_NO_ARGUMENT },
  { "--defaults-torrc",       ARGUMENT_NECESSARY },
  { "--hash-password",        ARGUMENT_NECESSARY },
  { "--dump-config",          ARGUMENT_OPTIONAL },
  { "--list-fingerprint",     TAKES_NO_ARGUMENT },
  { "--keygen",               TAKES_NO_ARGUMENT },
  { "--key-expiration",       ARGUMENT_OPTIONAL },
  { "--newpass",              TAKES_NO_ARGUMENT },
  { "--no-passphrase",        TAKES_NO_ARGUMENT },
  { "--passphrase-fd",        ARGUMENT_NECESSARY },
  { "--verify-config",        TAKES_NO_ARGUMENT },
  { "--ignore-missing-torrc", TAKES_NO_ARGUMENT },
  { "--quiet",                TAKES_NO_ARGUMENT },
  { "--hush",                 TAKES_NO_ARGUMENT },
  { "--version",              TAKES_NO_ARGUMENT },
  { "--library-versions",     TAKES_NO_ARGUMENT },
  { "-h",                     TAKES_NO_ARGUMENT },
  { "--help",                 TAKES_NO_ARGUMENT },
  { "--list-torrc-options",   TAKES_NO_ARGUMENT },
  { "--list-deprecated-options",TAKES_NO_ARGUMENT },
  { "--nt-service",           TAKES_NO_ARGUMENT },
  { "-nt-service",            TAKES_NO_ARGUMENT },
  { NULL, 0 },
};

int
config_parse_commandline(int argc, char **argv, int ignore_errors,
                         config_line_t **result,
                         config_line_t **cmdline_result)
{
  config_line_t *param = NULL;

  config_line_t *front = NULL;
  config_line_t **new = &front;

  config_line_t *front_cmdline = NULL;
  config_line_t **new_cmdline = &front_cmdline;

  char *s, *arg;
  int i = 1;

  while (i < argc) {
    unsigned command = CONFIG_LINE_NORMAL;
    takes_argument_t want_arg = ARGUMENT_NECESSARY;
    int is_cmdline = 0;
    int j;

    for (j = 0; CMDLINE_ONLY_OPTIONS[j].name != NULL; ++j) {
      if (!strcmp(argv[i], CMDLINE_ONLY_OPTIONS[j].name)) {
        is_cmdline = 1;
        want_arg = CMDLINE_ONLY_OPTIONS[j].takes_argument;
        break;
      }
    }

    s = argv[i];

    /* Each keyword may be prefixed with one or two dashes. */
    if (*s == '-')
      s++;
    if (*s == '-')
      s++;
    /* Figure out the command, if any. */
    if (*s == '+') {
      s++;
      command = CONFIG_LINE_APPEND;
    } else if (*s == '/') {
      s++;
      command = CONFIG_LINE_CLEAR;
      /* A 'clear' command has no argument. */
      want_arg = 0;
    }

    const int is_last = (i == argc-1);

    if (want_arg == ARGUMENT_NECESSARY && is_last) {
      if (ignore_errors) {
        arg = tor_strdup("");
      } else {
        log_warn(LD_CONFIG,"Command-line option '%s' with no value. Failing.",
            argv[i]);
        config_free_lines(front);
        config_free_lines(front_cmdline);
        return -1;
      }
    } else if (want_arg == ARGUMENT_OPTIONAL && is_last) {
      arg = tor_strdup("");
    } else {
      arg = (want_arg != TAKES_NO_ARGUMENT) ? tor_strdup(argv[i+1]) :
                                              tor_strdup("");
    }

    param = tor_malloc_zero(sizeof(config_line_t));
    param->key = is_cmdline ? tor_strdup(argv[i]) :
                   tor_strdup(config_expand_abbrev(&options_format, s, 1, 1));
    param->value = arg;
    param->command = command;
    param->next = NULL;
    log_debug(LD_CONFIG, "command line: parsed keyword '%s', value '%s'",
        param->key, param->value);

    if (is_cmdline) {
      *new_cmdline = param;
      new_cmdline = &((*new_cmdline)->next);
    } else {
      *new = param;
      new = &((*new)->next);
    }

    i += want_arg ? 2 : 1;
  }
  *cmdline_result = front_cmdline;
  *result = front;
  return 0;
}

int
option_is_recognized(const char *key)
{
  const config_var_t *var = config_find_option(&options_format, key);
  return (var != NULL);
}

const char *
option_get_canonical_name(const char *key)
{
  const config_var_t *var = config_find_option(&options_format, key);
  return var ? var->name : NULL;
}

config_line_t *
option_get_assignment(const or_options_t *options, const char *key)
{
  return config_get_assigned_option(&options_format, options, key, 1);
}

setopt_err_t
options_trial_assign(config_line_t *list, unsigned flags, char **msg)
{
  int r;
  or_options_t *trial_options = config_dup(&options_format, get_options());

  if ((r=config_assign(&options_format, trial_options,
                       list, flags, msg)) < 0) {
    or_options_free(trial_options);
    return r;
  }

  setopt_err_t rv;
  or_options_t *cur_options = get_options_mutable();

  in_option_validation = 1;

  if (options_validate(cur_options, trial_options,
                       global_default_options, 1, msg) < 0) {
    or_options_free(trial_options);
    rv = SETOPT_ERR_PARSE; /*XXX make this a separate return value. */
    goto done;
  }

  if (options_transition_allowed(cur_options, trial_options, msg) < 0) {
    or_options_free(trial_options);
    rv = SETOPT_ERR_TRANSITION;
    goto done;
  }
  in_option_validation = 0;

  if (set_options(trial_options, msg)<0) {
    or_options_free(trial_options);
    rv = SETOPT_ERR_SETTING;
    goto done;
  }

  /* we liked it. put it in place. */
  rv = SETOPT_OK;
 done:
  in_option_validation = 0;
  return rv;
}

static void
print_usage(void)
{
  printf(
"Copyright (c) 2001-2004, Roger Dingledine\n"
"Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson\n"
"Copyright (c) 2007-2019, The Tor Project, Inc.\n\n"
"tor -f <torrc> [args]\n"
"See man page for options, or https://www.torproject.org/ for "
"documentation.\n");
}

static void
list_torrc_options(void)
{
  int i;
  for (i = 0; option_vars_[i].name; ++i) {
    const config_var_t *var = &option_vars_[i];
    if (var->type == CONFIG_TYPE_OBSOLETE ||
        var->type == CONFIG_TYPE_LINELIST_V)
      continue;
    printf("%s\n", var->name);
  }
}

static void
list_deprecated_options(void)
{
  const config_deprecation_t *d;
  for (d = option_deprecation_notes_; d->name; ++d) {
    printf("%s\n", d->name);
  }
}

static uint32_t last_resolved_addr = 0;

uint32_t
get_last_resolved_addr(void)
{
  return last_resolved_addr;
}

void
reset_last_resolved_addr(void)
{
  last_resolved_addr = 0;
}

/* Return true if <b>options</b> is using the default authorities, and false
 * if any authority-related option has been overridden. */
int
using_default_dir_authorities(const or_options_t *options)
{
  return (!options->DirAuthorities && !options->AlternateDirAuthority);
}

int
resolve_my_address(int warn_severity, const or_options_t *options,
                   uint32_t *addr_out,
                   const char **method_out, char **hostname_out)
{
  struct in_addr in;
  uint32_t addr; /* host order */
  char hostname[256];
  const char *method_used;
  const char *hostname_used;
  int explicit_ip=1;
  int explicit_hostname=1;
  int from_interface=0;
  char *addr_string = NULL;
  const char *address = options->Address;
  int notice_severity = warn_severity <= LOG_NOTICE ?
                          LOG_NOTICE : warn_severity;

  tor_addr_t myaddr;
  tor_assert(addr_out);

  /*
   * Step one: Fill in 'hostname' to be our best guess.
   */

  if (address && *address) {
    strlcpy(hostname, address, sizeof(hostname));
  } else { /* then we need to guess our address */
    explicit_ip = 0; /* it's implicit */
    explicit_hostname = 0; /* it's implicit */

    if (tor_gethostname(hostname, sizeof(hostname)) < 0) {
      log_fn(warn_severity, LD_NET,"Error obtaining local hostname");
      return -1;
    }
    log_debug(LD_CONFIG, "Guessed local host name as '%s'", hostname);
  }

  /*
   * Step two: Now that we know 'hostname', parse it or resolve it. If
   * it doesn't parse or resolve, look at the interface address. Set 'addr'
   * to be our (host-order) 32-bit answer.
   */

  if (tor_inet_aton(hostname, &in) == 0) {
    /* then we have to resolve it */
    explicit_ip = 0;
    if (tor_lookup_hostname(hostname, &addr)) { /* failed to resolve */
      uint32_t interface_ip; /* host order */

      if (explicit_hostname) {
        log_fn(warn_severity, LD_CONFIG,
               "Could not resolve local Address '%s'. Failing.", hostname);
        return -1;
      }
      log_fn(notice_severity, LD_CONFIG,
             "Could not resolve guessed local hostname '%s'. "
             "Trying something else.", hostname);
      if (get_interface_address(warn_severity, &interface_ip)) {
        log_fn(warn_severity, LD_CONFIG,
               "Could not get local interface IP address. Failing.");
        return -1;
      }
      from_interface = 1;
      addr = interface_ip;
      log_fn(notice_severity, LD_CONFIG, "Learned IP address '%s' for "
             "local interface. Using that.", fmt_addr32(addr));
      strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
    } else { /* resolved hostname into addr */
      tor_addr_from_ipv4h(&myaddr, addr);

      if (!explicit_hostname &&
          tor_addr_is_internal(&myaddr, 0)) {
        tor_addr_t interface_ip;

        log_fn(notice_severity, LD_CONFIG, "Guessed local hostname '%s' "
               "resolves to a private IP address (%s). Trying something "
               "else.", hostname, fmt_addr32(addr));

        if (get_interface_address6(warn_severity, AF_INET, &interface_ip)<0) {
          log_fn(warn_severity, LD_CONFIG,
                 "Could not get local interface IP address. Too bad.");
        } else if (tor_addr_is_internal(&interface_ip, 0)) {
          log_fn(notice_severity, LD_CONFIG,
                 "Interface IP address '%s' is a private address too. "
                 "Ignoring.", fmt_addr(&interface_ip));
        } else {
          from_interface = 1;
          addr = tor_addr_to_ipv4h(&interface_ip);
          log_fn(notice_severity, LD_CONFIG,
                 "Learned IP address '%s' for local interface."
                 " Using that.", fmt_addr32(addr));
          strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
        }
      }
    }
  } else {
    addr = ntohl(in.s_addr); /* set addr so that addr_string is not
                              * illformed */
  }

  /*
   * Step three: Check whether 'addr' is an internal IP address, and error
   * out if it is and we don't want that.
   */

  tor_addr_from_ipv4h(&myaddr,addr);

  addr_string = tor_dup_ip(addr);
  if (tor_addr_is_internal(&myaddr, 0)) {
    /* make sure we're ok with publishing an internal IP */
    if (using_default_dir_authorities(options)) {
      /* if they are using the default authorities, disallow internal IPs
       * always. */
      log_fn(warn_severity, LD_CONFIG,
             "Address '%s' resolves to private IP address '%s'. "
             "Tor servers that use the default DirAuthorities must have "
             "public IP addresses.", hostname, addr_string);
      tor_free(addr_string);
      return -1;
    }
    if (!explicit_ip) {
      /* even if they've set their own authorities, require an explicit IP if
       * they're using an internal address. */
      log_fn(warn_severity, LD_CONFIG, "Address '%s' resolves to private "
             "IP address '%s'. Please set the Address config option to be "
             "the IP address you want to use.", hostname, addr_string);
      tor_free(addr_string);
      return -1;
    }
  }

  /*
   * Step four: We have a winner! 'addr' is our answer for sure, and
   * 'addr_string' is its string form. Fill out the various fields to
   * say how we decided it.
   */

  log_debug(LD_CONFIG, "Resolved Address to '%s'.", addr_string);

  if (explicit_ip) {
    method_used = "CONFIGURED";
    hostname_used = NULL;
  } else if (explicit_hostname) {
    method_used = "RESOLVED";
    hostname_used = hostname;
  } else if (from_interface) {
    method_used = "INTERFACE";
    hostname_used = NULL;
  } else {
    method_used = "GETHOSTNAME";
    hostname_used = hostname;
  }

  *addr_out = addr;
  if (method_out)
    *method_out = method_used;
  if (hostname_out)
    *hostname_out = hostname_used ? tor_strdup(hostname_used) : NULL;

  /*
   * Step five: Check if the answer has changed since last time (or if
   * there was no last time), and if so call various functions to keep
   * us up-to-date.
   */

  if (last_resolved_addr && last_resolved_addr != *addr_out) {
    /* Leave this as a notice, regardless of the requested severity,
     * at least until dynamic IP address support becomes bulletproof. */
    log_notice(LD_NET,
               "Your IP address seems to have changed to %s "
               "(METHOD=%s%s%s). Updating.",
               addr_string, method_used,
               hostname_used ? " HOSTNAME=" : "",
               hostname_used ? hostname_used : "");
    ip_address_changed(0);
  }

  if (last_resolved_addr != *addr_out) {
    control_event_server_status(LOG_NOTICE,
                                "EXTERNAL_ADDRESS ADDRESS=%s METHOD=%s%s%s",
                                addr_string, method_used,
                                hostname_used ? " HOSTNAME=" : "",
                                hostname_used ? hostname_used : "");
  }
  last_resolved_addr = *addr_out;

  /*
   * And finally, clean up and return success.
   */

  tor_free(addr_string);
  return 0;
}

MOCK_IMPL(int,
is_local_addr, (const tor_addr_t *addr))
{
  if (tor_addr_is_internal(addr, 0))
    return 1;
  /* Check whether ip is on the same /24 as we are. */
  if (get_options()->EnforceDistinctSubnets == 0)
    return 0;
  if (tor_addr_family(addr) == AF_INET) {
    uint32_t ip = tor_addr_to_ipv4h(addr);

    /* It's possible that this next check will hit before the first time
     * resolve_my_address actually succeeds.  (For clients, it is likely that
     * resolve_my_address will never be called at all).  In those cases,
     * last_resolved_addr will be 0, and so checking to see whether ip is on
     * the same /24 as last_resolved_addr will be the same as checking whether
     * it was on net 0, which is already done by tor_addr_is_internal.
     */
    if ((last_resolved_addr & (uint32_t)0xffffff00ul)
        == (ip & (uint32_t)0xffffff00ul))
      return 1;
  }
  return 0;
}

or_options_t *
options_new(void)
{
  return config_new(&options_format);
}

void
options_init(or_options_t *options)
{
  config_init(&options_format, options);
}

char *
options_dump(const or_options_t *options, int how_to_dump)
{
  const or_options_t *use_defaults;
  int minimal;
  switch (how_to_dump) {
    case OPTIONS_DUMP_MINIMAL:
      use_defaults = global_default_options;
      minimal = 1;
      break;
    case OPTIONS_DUMP_DEFAULTS:
      use_defaults = NULL;
      minimal = 1;
      break;
    case OPTIONS_DUMP_ALL:
      use_defaults = NULL;
      minimal = 0;
      break;
    default:
      log_warn(LD_BUG, "Bogus value for how_to_dump==%d", how_to_dump);
      return NULL;
  }

  return config_dump(&options_format, use_defaults, options, minimal, 0);
}

static int
validate_ports_csv(smartlist_t *sl, const char *name, char **msg)
{
  int i;
  tor_assert(name);

  if (!sl)
    return 0;

  SMARTLIST_FOREACH(sl, const char *, cp,
  {
    i = atoi(cp);
    if (i < 1 || i > 65535) {
      tor_asprintf(msg, "Port '%s' out of range in %s", cp, name);
      return -1;
    }
  });
  return 0;
}

static int
ensure_bandwidth_cap(uint64_t *value, const char *desc, char **msg)
{
  if (*value > ROUTER_MAX_DECLARED_BANDWIDTH) {
    /* This handles an understandable special case where somebody says "2gb"
     * whereas our actual maximum is 2gb-1 (INT_MAX) */
    --*value;
  }
  if (*value > ROUTER_MAX_DECLARED_BANDWIDTH) {
    tor_asprintf(msg, "%s (%"PRIu64") must be at most %d",
                 desc, (*value),
                 ROUTER_MAX_DECLARED_BANDWIDTH);
    return -1;
  }
  return 0;
}

static int
compute_publishserverdescriptor(or_options_t *options)
{
  smartlist_t *list = options->PublishServerDescriptor;
  dirinfo_type_t *auth = &options->PublishServerDescriptor_;
  *auth = NO_DIRINFO;
  if (!list) /* empty list, answer is none */
    return 0;
  SMARTLIST_FOREACH_BEGIN(list, const char *, string) {
    if (!strcasecmp(string, "v1"))
      log_warn(LD_CONFIG, "PublishServerDescriptor v1 has no effect, because "
                          "there are no v1 directory authorities anymore.");
    else if (!strcmp(string, "1"))
      if (options->BridgeRelay)
        *auth |= BRIDGE_DIRINFO;
      else
        *auth |= V3_DIRINFO;
    else if (!strcasecmp(string, "v2"))
      log_warn(LD_CONFIG, "PublishServerDescriptor v2 has no effect, because "
                          "there are no v2 directory authorities anymore.");
    else if (!strcasecmp(string, "v3"))
      *auth |= V3_DIRINFO;
    else if (!strcasecmp(string, "bridge"))
      *auth |= BRIDGE_DIRINFO;
    else if (!strcasecmp(string, "hidserv"))
      log_warn(LD_CONFIG,
               "PublishServerDescriptor hidserv is invalid. See "
               "PublishHidServDescriptors.");
    else if (!strcasecmp(string, "") || !strcmp(string, "0"))
      /* no authority */;
    else
      return -1;
  } SMARTLIST_FOREACH_END(string);
  return 0;
}

#define MIN_REND_POST_PERIOD (10*60)
#define MIN_REND_POST_PERIOD_TESTING (5)

#define MAX_CIRCS_AVAILABLE_TIME (24*60*60)

#define MAX_DIR_PERIOD ((7*24*60*60)/2)

#define MIN_MAX_CIRCUIT_DIRTINESS 10

#define MAX_MAX_CIRCUIT_DIRTINESS (30*24*60*60)

#define MIN_CIRCUIT_STREAM_TIMEOUT 10

#define RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT (10)

static int
options_validate_cb(void *old_options, void *options, void *default_options,
                    int from_setconf, char **msg)
{
  in_option_validation = 1;
  int rv = options_validate(old_options, options, default_options,
                          from_setconf, msg);
  in_option_validation = 0;
  return rv;
}

static void
options_free_cb(void *options)
{
  or_options_free_(options);
}

#define REJECT(arg) \
  STMT_BEGIN *msg = tor_strdup(arg); return -1; STMT_END
#if defined(__GNUC__) && __GNUC__ <= 3
#define COMPLAIN(args...) \
  STMT_BEGIN log_warn(LD_CONFIG, args); STMT_END
#else
#define COMPLAIN(args, ...)                                     \
  STMT_BEGIN log_warn(LD_CONFIG, args, ##__VA_ARGS__); STMT_END
#endif /* defined(__GNUC__) && __GNUC__ <= 3 */

static int
warn_if_option_path_is_relative(const char *option,
                                char *filepath)
{
  if (filepath && path_is_relative(filepath)) {
    char *abs_path = make_path_absolute(filepath);
    COMPLAIN("Path for %s (%s) is relative and will resolve to %s."
             " Is this what you wanted?", option, filepath, abs_path);
    tor_free(abs_path);
    return 1;
  }
  return 0;
}

static int
warn_about_relative_paths(or_options_t *options)
{
  tor_assert(options);
  int n = 0;

  n += warn_if_option_path_is_relative("CookieAuthFile",
                                       options->CookieAuthFile);
  n += warn_if_option_path_is_relative("ExtORPortCookieAuthFile",
                                       options->ExtORPortCookieAuthFile);
  n += warn_if_option_path_is_relative("DirPortFrontPage",
                                       options->DirPortFrontPage);
  n += warn_if_option_path_is_relative("V3BandwidthsFile",
                                       options->V3BandwidthsFile);
  n += warn_if_option_path_is_relative("ControlPortWriteToFile",
                                       options->ControlPortWriteToFile);
  n += warn_if_option_path_is_relative("GeoIPFile",options->GeoIPFile);
  n += warn_if_option_path_is_relative("GeoIPv6File",options->GeoIPv6File);
  n += warn_if_option_path_is_relative("Log",options->DebugLogFile);
  n += warn_if_option_path_is_relative("AccelDir",options->AccelDir);
  n += warn_if_option_path_is_relative("DataDirectory",options->DataDirectory);
  n += warn_if_option_path_is_relative("PidFile",options->PidFile);
  n += warn_if_option_path_is_relative("ClientOnionAuthDir",
                                        options->ClientOnionAuthDir);

  for (config_line_t *hs_line = options->RendConfigLines; hs_line;
       hs_line = hs_line->next) {
    if (!strcasecmp(hs_line->key, "HiddenServiceDir"))
      n += warn_if_option_path_is_relative("HiddenServiceDir",hs_line->value);
  }
  return n != 0;
}

/* Validate options related to the scheduler. From the Schedulers list, the
 * SchedulerTypes_ list is created with int values so once we select the
 * scheduler, which can happen anytime at runtime, we don't have to parse
 * strings and thus be quick.
 *
 * Return 0 on success else -1 and msg is set with an error message. */
static int
options_validate_scheduler(or_options_t *options, char **msg)
{
  tor_assert(options);
  tor_assert(msg);

  if (!options->Schedulers || smartlist_len(options->Schedulers) == 0) {
    REJECT("Empty Schedulers list. Either remove the option so the defaults "
           "can be used or set at least one value.");
  }
  /* Ok, we do have scheduler types, validate them. */
  options->SchedulerTypes_ = smartlist_new();
  SMARTLIST_FOREACH_BEGIN(options->Schedulers, const char *, type) {
    int *sched_type;
    if (!strcasecmp("KISTLite", type)) {
      sched_type = tor_malloc_zero(sizeof(int));
      *sched_type = SCHEDULER_KIST_LITE;
      smartlist_add(options->SchedulerTypes_, sched_type);
    } else if (!strcasecmp("KIST", type)) {
      sched_type = tor_malloc_zero(sizeof(int));
      *sched_type = SCHEDULER_KIST;
      smartlist_add(options->SchedulerTypes_, sched_type);
    } else if (!strcasecmp("Vanilla", type)) {
      sched_type = tor_malloc_zero(sizeof(int));
      *sched_type = SCHEDULER_VANILLA;
      smartlist_add(options->SchedulerTypes_, sched_type);
    } else {
      tor_asprintf(msg, "Unknown type %s in option Schedulers. "
                        "Possible values are KIST, KISTLite and Vanilla.",
                   escaped(type));
      return -1;
    }
  } SMARTLIST_FOREACH_END(type);

  if (options->KISTSockBufSizeFactor < 0) {
    REJECT("KISTSockBufSizeFactor must be at least 0");
  }

  /* Don't need to validate that the Interval is less than anything because
   * zero is valid and all negative values are valid. */
  if (options->KISTSchedRunInterval > KIST_SCHED_RUN_INTERVAL_MAX) {
    tor_asprintf(msg, "KISTSchedRunInterval must not be more than %d (ms)",
                 KIST_SCHED_RUN_INTERVAL_MAX);
    return -1;
  }

  return 0;
}

/* Validate options related to single onion services.
 * Modifies some options that are incompatible with single onion services.
 * On failure returns -1, and sets *msg to an error string.
 * Returns 0 on success. */
STATIC int
options_validate_single_onion(or_options_t *options, char **msg)
{
  /* The two single onion service options must have matching values. */
  if (options->HiddenServiceSingleHopMode &&
      !options->HiddenServiceNonAnonymousMode) {
    REJECT("HiddenServiceSingleHopMode does not provide any server anonymity. "
           "It must be used with HiddenServiceNonAnonymousMode set to 1.");
  }
  if (options->HiddenServiceNonAnonymousMode &&
      !options->HiddenServiceSingleHopMode) {
    REJECT("HiddenServiceNonAnonymousMode does not provide any server "
           "anonymity. It must be used with HiddenServiceSingleHopMode set to "
           "1.");
  }

  /* Now that we've checked that the two options are consistent, we can safely
   * call the rend_service_* functions that abstract these options. */

  /* If you run an anonymous client with an active Single Onion service, the
   * client loses anonymity. */
  const int client_port_set = (options->SocksPort_set ||
                               options->TransPort_set ||
                               options->NATDPort_set ||
                               options->DNSPort_set ||
                               options->HTTPTunnelPort_set);
  if (rend_service_non_anonymous_mode_enabled(options) && client_port_set) {
    REJECT("HiddenServiceNonAnonymousMode is incompatible with using Tor as "
           "an anonymous client. Please set Socks/Trans/NATD/DNSPort to 0, or "
           "revert HiddenServiceNonAnonymousMode to 0.");
  }

  if (rend_service_allow_non_anonymous_connection(options)
      && options->UseEntryGuards) {
    /* Single Onion services only use entry guards when uploading descriptors;
     * all other connections are one-hop. Further, Single Onions causes the
     * hidden service code to do things which break the path bias
     * detector, and it's far easier to turn off entry guards (and
     * thus the path bias detector with it) than to figure out how to
     * make path bias compatible with single onions.
     */
    log_notice(LD_CONFIG,
               "HiddenServiceSingleHopMode is enabled; disabling "
               "UseEntryGuards.");
    options->UseEntryGuards = 0;
  }

  return 0;
}

STATIC int
options_validate(or_options_t *old_options, or_options_t *options,
                 or_options_t *default_options, int from_setconf, char **msg)
{
  config_line_t *cl;
  const char *uname = get_uname();
  int n_ports=0;
  int world_writable_control_socket=0;

  tor_assert(msg);
  *msg = NULL;

  if (parse_ports(options, 1, msg, &n_ports,
                  &world_writable_control_socket) < 0)
    return -1;

  /* Set UseEntryGuards from the configured value, before we check it below.
   * We change UseEntryGuards when it's incompatible with other options,
   * but leave UseEntryGuards_option with the original value.
   * Always use the value of UseEntryGuards, not UseEntryGuards_option. */
  options->UseEntryGuards = options->UseEntryGuards_option;

  if (server_mode(options) &&
      (!strcmpstart(uname, "Windows 95") ||
       !strcmpstart(uname, "Windows 98") ||
       !strcmpstart(uname, "Windows Me"))) {
    log_warn(LD_CONFIG, "Tor is running as a server, but you are "
        "running %s; this probably won't work. See "
        "https://www.torproject.org/docs/faq.html#BestOSForRelay "
        "for details.", uname);
  }

  if (parse_outbound_addresses(options, 1, msg) < 0)
    return -1;

  if (validate_data_directories(options)<0)
    REJECT("Invalid DataDirectory");

  /* need to check for relative paths after we populate
   * options->DataDirectory (just above). */
  if (warn_about_relative_paths(options) && options->RunAsDaemon) {
    REJECT("You have specified at least one relative path (see above) "
           "with the RunAsDaemon option. RunAsDaemon is not compatible "
           "with relative paths.");
  }

  if (options->Nickname == NULL) {
    if (server_mode(options)) {
      options->Nickname = tor_strdup(UNNAMED_ROUTER_NICKNAME);
    }
  } else {
    if (!is_legal_nickname(options->Nickname)) {
      tor_asprintf(msg,
          "Nickname '%s', nicknames must be between 1 and 19 characters "
          "inclusive, and must contain only the characters [a-zA-Z0-9].",
          options->Nickname);
      return -1;
    }
  }

  if (server_mode(options) && !options->ContactInfo)
    log_notice(LD_CONFIG, "Your ContactInfo config option is not set. "
        "Please consider setting it, so we can contact you if your server is "
        "misconfigured or something else goes wrong.");
  const char *ContactInfo = options->ContactInfo;
  if (ContactInfo && !string_is_utf8(ContactInfo, strlen(ContactInfo)))
    REJECT("ContactInfo config option must be UTF-8.");

  check_network_configuration(server_mode(options));

  /* Special case on first boot if no Log options are given. */
  if (!options->Logs && !options->RunAsDaemon && !from_setconf) {
    if (quiet_level == 0)
      config_line_append(&options->Logs, "Log", "notice stdout");
    else if (quiet_level == 1)
      config_line_append(&options->Logs, "Log", "warn stdout");
  }

  /* Validate the tor_log(s) */
  if (options_init_logs(old_options, options, 1)<0)
    REJECT("Failed to validate Log options. See logs for details.");

  if (authdir_mode(options)) {
    /* confirm that our address isn't broken, so we can complain now */
    uint32_t tmp;
    if (resolve_my_address(LOG_WARN, options, &tmp, NULL, NULL) < 0)
      REJECT("Failed to resolve/guess local address. See logs for details.");
  }

  if (server_mode(options) && options->RendConfigLines)
    log_warn(LD_CONFIG,
        "Tor is currently configured as a relay and a hidden service. "
        "That's not very secure: you should probably run your hidden service "
        "in a separate Tor process, at least -- see "
        "https://trac.torproject.org/8742");

  /* XXXX require that the only port not be DirPort? */
  /* XXXX require that at least one port be listened-upon. */
  if (n_ports == 0 && !options->RendConfigLines)
    log_warn(LD_CONFIG,
        "SocksPort, TransPort, NATDPort, DNSPort, and ORPort are all "
        "undefined, and there aren't any hidden services configured.  "
        "Tor will still run, but probably won't do anything.");

  options->TransProxyType_parsed = TPT_DEFAULT;
#ifdef USE_TRANSPARENT
  if (options->TransProxyType) {
    if (!strcasecmp(options->TransProxyType, "default")) {
      options->TransProxyType_parsed = TPT_DEFAULT;
    } else if (!strcasecmp(options->TransProxyType, "pf-divert")) {
#if !defined(OpenBSD) && !defined( DARWIN )
      /* Later versions of OS X have pf */
      REJECT("pf-divert is a OpenBSD-specific "
             "and OS X/Darwin-specific feature.");
#else
      options->TransProxyType_parsed = TPT_PF_DIVERT;
#endif /* !defined(OpenBSD) && !defined( DARWIN ) */
    } else if (!strcasecmp(options->TransProxyType, "tproxy")) {
#if !defined(__linux__)
      REJECT("TPROXY is a Linux-specific feature.");
#else
      options->TransProxyType_parsed = TPT_TPROXY;
#endif
    } else if (!strcasecmp(options->TransProxyType, "ipfw")) {
#ifndef KERNEL_MAY_SUPPORT_IPFW
      /* Earlier versions of OS X have ipfw */
      REJECT("ipfw is a FreeBSD-specific "
             "and OS X/Darwin-specific feature.");
#else
      options->TransProxyType_parsed = TPT_IPFW;
#endif /* !defined(KERNEL_MAY_SUPPORT_IPFW) */
    } else {
      REJECT("Unrecognized value for TransProxyType");
    }

    if (strcasecmp(options->TransProxyType, "default") &&
        !options->TransPort_set) {
      REJECT("Cannot use TransProxyType without any valid TransPort.");
    }
  }
#else /* !(defined(USE_TRANSPARENT)) */
  if (options->TransPort_set)
    REJECT("TransPort is disabled in this build.");
#endif /* defined(USE_TRANSPARENT) */

  if (options->TokenBucketRefillInterval <= 0
      || options->TokenBucketRefillInterval > 1000) {
    REJECT("TokenBucketRefillInterval must be between 1 and 1000 inclusive.");
  }

  if (options->ExcludeExitNodes || options->ExcludeNodes) {
    options->ExcludeExitNodesUnion_ = routerset_new();
    routerset_union(options->ExcludeExitNodesUnion_,options->ExcludeExitNodes);
    routerset_union(options->ExcludeExitNodesUnion_,options->ExcludeNodes);
  }

  if (options->NodeFamilies) {
    options->NodeFamilySets = smartlist_new();
    for (cl = options->NodeFamilies; cl; cl = cl->next) {
      routerset_t *rs = routerset_new();
      if (routerset_parse(rs, cl->value, cl->key) == 0) {
        smartlist_add(options->NodeFamilySets, rs);
      } else {
        routerset_free(rs);
      }
    }
  }

  if (options->ExcludeNodes && options->StrictNodes) {
    COMPLAIN("You have asked to exclude certain relays from all positions "
             "in your circuits. Expect hidden services and other Tor "
             "features to be broken in unpredictable ways.");
  }

  for (cl = options->RecommendedPackages; cl; cl = cl->next) {
    if (! validate_recommended_package_line(cl->value)) {
      log_warn(LD_CONFIG, "Invalid RecommendedPackage line %s will be ignored",
               escaped(cl->value));
    }
  }

  if (options->AuthoritativeDir) {
    if (!options->ContactInfo && !options->TestingTorNetwork)
      REJECT("Authoritative directory servers must set ContactInfo");
    if (!options->RecommendedClientVersions)
      options->RecommendedClientVersions =
        config_lines_dup(options->RecommendedVersions);
    if (!options->RecommendedServerVersions)
      options->RecommendedServerVersions =
        config_lines_dup(options->RecommendedVersions);
    if (options->VersioningAuthoritativeDir &&
        (!options->RecommendedClientVersions ||
         !options->RecommendedServerVersions))
      REJECT("Versioning authoritative dir servers must set "
             "Recommended*Versions.");

#ifdef HAVE_MODULE_DIRAUTH
    char *t;
    /* Call these functions to produce warnings only. */
    t = format_recommended_version_list(options->RecommendedClientVersions, 1);
    tor_free(t);
    t = format_recommended_version_list(options->RecommendedServerVersions, 1);
    tor_free(t);
#endif

    if (options->UseEntryGuards) {
      log_info(LD_CONFIG, "Authoritative directory servers can't set "
               "UseEntryGuards. Disabling.");
      options->UseEntryGuards = 0;
    }
    if (!options->DownloadExtraInfo && authdir_mode_v3(options)) {
      log_info(LD_CONFIG, "Authoritative directories always try to download "
               "extra-info documents. Setting DownloadExtraInfo.");
      options->DownloadExtraInfo = 1;
    }
    if (!(options->BridgeAuthoritativeDir ||
          options->V3AuthoritativeDir))
      REJECT("AuthoritativeDir is set, but none of "
             "(Bridge/V3)AuthoritativeDir is set.");
    /* If we have a v3bandwidthsfile and it's broken, complain on startup */
    if (options->V3BandwidthsFile && !old_options) {
      dirserv_read_measured_bandwidths(options->V3BandwidthsFile, NULL, NULL);
    }
    /* same for guardfraction file */
    if (options->GuardfractionFile && !old_options) {
      dirserv_read_guardfraction_file(options->GuardfractionFile, NULL);
    }
  }

  if (options->AuthoritativeDir && !options->DirPort_set)
    REJECT("Running as authoritative directory, but no DirPort set.");

  if (options->AuthoritativeDir && !options->ORPort_set)
    REJECT("Running as authoritative directory, but no ORPort set.");

  if (options->AuthoritativeDir && options->ClientOnly)
    REJECT("Running as authoritative directory, but ClientOnly also set.");

  if (options->FetchDirInfoExtraEarly && !options->FetchDirInfoEarly)
    REJECT("FetchDirInfoExtraEarly requires that you also set "
           "FetchDirInfoEarly");

  if (options->ConnLimit <= 0) {
    tor_asprintf(msg,
        "ConnLimit must be greater than 0, but was set to %d",
        options->ConnLimit);
    return -1;
  }

  if (options->PathsNeededToBuildCircuits >= 0.0) {
    if (options->PathsNeededToBuildCircuits < 0.25) {
      log_warn(LD_CONFIG, "PathsNeededToBuildCircuits is too low. Increasing "
               "to 0.25");
      options->PathsNeededToBuildCircuits = 0.25;
    } else if (options->PathsNeededToBuildCircuits > 0.95) {
      log_warn(LD_CONFIG, "PathsNeededToBuildCircuits is too high. Decreasing "
               "to 0.95");
      options->PathsNeededToBuildCircuits = 0.95;
    }
  }

  if (options->MaxClientCircuitsPending <= 0 ||
      options->MaxClientCircuitsPending > MAX_MAX_CLIENT_CIRCUITS_PENDING) {
    tor_asprintf(msg,
                 "MaxClientCircuitsPending must be between 1 and %d, but "
                 "was set to %d", MAX_MAX_CLIENT_CIRCUITS_PENDING,
                 options->MaxClientCircuitsPending);
    return -1;
  }

  if (validate_ports_csv(options->FirewallPorts, "FirewallPorts", msg) < 0)
    return -1;

  if (validate_ports_csv(options->LongLivedPorts, "LongLivedPorts", msg) < 0)
    return -1;

  if (validate_ports_csv(options->RejectPlaintextPorts,
                         "RejectPlaintextPorts", msg) < 0)
    return -1;

  if (validate_ports_csv(options->WarnPlaintextPorts,
                         "WarnPlaintextPorts", msg) < 0)
    return -1;

  if (options->FascistFirewall && !options->ReachableAddresses) {
    if (options->FirewallPorts && smartlist_len(options->FirewallPorts)) {
      /* We already have firewall ports set, so migrate them to
       * ReachableAddresses, which will set ReachableORAddresses and
       * ReachableDirAddresses if they aren't set explicitly. */
      smartlist_t *instead = smartlist_new();
      config_line_t *new_line = tor_malloc_zero(sizeof(config_line_t));
      new_line->key = tor_strdup("ReachableAddresses");
      /* If we're configured with the old format, we need to prepend some
       * open ports. */
      SMARTLIST_FOREACH(options->FirewallPorts, const char *, portno,
      {
        int p = atoi(portno);
        if (p<0) continue;
        smartlist_add_asprintf(instead, "*:%d", p);
      });
      new_line->value = smartlist_join_strings(instead,",",0,NULL);
      /* These have been deprecated since 0.1.1.5-alpha-cvs */
      log_notice(LD_CONFIG,
          "Converting FascistFirewall and FirewallPorts "
          "config options to new format: \"ReachableAddresses %s\"",
          new_line->value);
      options->ReachableAddresses = new_line;
      SMARTLIST_FOREACH(instead, char *, cp, tor_free(cp));
      smartlist_free(instead);
    } else {
      /* We do not have FirewallPorts set, so add 80 to
       * ReachableDirAddresses, and 443 to ReachableORAddresses. */
      if (!options->ReachableDirAddresses) {
        config_line_t *new_line = tor_malloc_zero(sizeof(config_line_t));
        new_line->key = tor_strdup("ReachableDirAddresses");
        new_line->value = tor_strdup("*:80");
        options->ReachableDirAddresses = new_line;
        log_notice(LD_CONFIG, "Converting FascistFirewall config option "
            "to new format: \"ReachableDirAddresses *:80\"");
      }
      if (!options->ReachableORAddresses) {
        config_line_t *new_line = tor_malloc_zero(sizeof(config_line_t));
        new_line->key = tor_strdup("ReachableORAddresses");
        new_line->value = tor_strdup("*:443");
        options->ReachableORAddresses = new_line;
        log_notice(LD_CONFIG, "Converting FascistFirewall config option "
            "to new format: \"ReachableORAddresses *:443\"");
      }
    }
  }

  if ((options->ReachableAddresses ||
       options->ReachableORAddresses ||
       options->ReachableDirAddresses ||
       options->ClientUseIPv4 == 0) &&
      server_mode(options))
    REJECT("Servers must be able to freely connect to the rest "
           "of the Internet, so they must not set Reachable*Addresses "
           "or FascistFirewall or FirewallPorts or ClientUseIPv4 0.");

  if (options->UseBridges &&
      server_mode(options))
    REJECT("Servers must be able to freely connect to the rest "
           "of the Internet, so they must not set UseBridges.");

  /* If both of these are set, we'll end up with funny behavior where we
   * demand enough entrynodes be up and running else we won't build
   * circuits, yet we never actually use them. */
  if (options->UseBridges && options->EntryNodes)
    REJECT("You cannot set both UseBridges and EntryNodes.");

  /* If we have UseBridges as 1 and UseEntryGuards as 0, we end up bypassing
   * the use of bridges */
  if (options->UseBridges && !options->UseEntryGuards)
    REJECT("Setting UseBridges requires also setting UseEntryGuards.");

  options->MaxMemInQueues =
    compute_real_max_mem_in_queues(options->MaxMemInQueues_raw,
                                   server_mode(options));
  options->MaxMemInQueues_low_threshold = (options->MaxMemInQueues / 4) * 3;

  if (!options->SafeLogging ||
      !strcasecmp(options->SafeLogging, "0")) {
    options->SafeLogging_ = SAFELOG_SCRUB_NONE;
  } else if (!strcasecmp(options->SafeLogging, "relay")) {
    options->SafeLogging_ = SAFELOG_SCRUB_RELAY;
  } else if (!strcasecmp(options->SafeLogging, "1")) {
    options->SafeLogging_ = SAFELOG_SCRUB_ALL;
  } else {
    tor_asprintf(msg,
                     "Unrecognized value '%s' in SafeLogging",
                     escaped(options->SafeLogging));
    return -1;
  }

  if (compute_publishserverdescriptor(options) < 0) {
    tor_asprintf(msg, "Unrecognized value in PublishServerDescriptor");
    return -1;
  }

  if ((options->BridgeRelay
        || options->PublishServerDescriptor_ & BRIDGE_DIRINFO)
      && (options->PublishServerDescriptor_ & V3_DIRINFO)) {
    REJECT("Bridges are not supposed to publish router descriptors to the "
           "directory authorities. Please correct your "
           "PublishServerDescriptor line.");
  }

  if (options->BridgeRelay && options->DirPort_set) {
    log_warn(LD_CONFIG, "Can't set a DirPort on a bridge relay; disabling "
             "DirPort");
    config_free_lines(options->DirPort_lines);
    options->DirPort_lines = NULL;
    options->DirPort_set = 0;
  }

  if (server_mode(options) && options->ConnectionPadding != -1) {
    REJECT("Relays must use 'auto' for the ConnectionPadding setting.");
  }

  if (server_mode(options) && options->ReducedConnectionPadding != 0) {
    REJECT("Relays cannot set ReducedConnectionPadding. ");
  }

  if (options->BridgeDistribution) {
    if (!options->BridgeRelay) {
      REJECT("You set BridgeDistribution, but you didn't set BridgeRelay!");
    }
    if (check_bridge_distribution_setting(options->BridgeDistribution) < 0) {
      REJECT("Invalid BridgeDistribution value.");
    }
  }

  if (options->MinUptimeHidServDirectoryV2 < 0) {
    log_warn(LD_CONFIG, "MinUptimeHidServDirectoryV2 option must be at "
                        "least 0 seconds. Changing to 0.");
    options->MinUptimeHidServDirectoryV2 = 0;
  }

  const int min_rendpostperiod =
    options->TestingTorNetwork ?
    MIN_REND_POST_PERIOD_TESTING : MIN_REND_POST_PERIOD;
  if (options->RendPostPeriod < min_rendpostperiod) {
    log_warn(LD_CONFIG, "RendPostPeriod option is too short; "
             "raising to %d seconds.", min_rendpostperiod);
    options->RendPostPeriod = min_rendpostperiod;
  }

  if (options->RendPostPeriod > MAX_DIR_PERIOD) {
    log_warn(LD_CONFIG, "RendPostPeriod is too large; clipping to %ds.",
             MAX_DIR_PERIOD);
    options->RendPostPeriod = MAX_DIR_PERIOD;
  }

  /* Check the Single Onion Service options */
  if (options_validate_single_onion(options, msg) < 0)
    return -1;

  if (options->CircuitsAvailableTimeout > MAX_CIRCS_AVAILABLE_TIME) {
    // options_t is immutable for new code (the above code is older),
    // so just make the user fix the value themselves rather than
    // silently keep a shadow value lower than what they asked for.
    REJECT("CircuitsAvailableTimeout is too large. Max is 24 hours.");
  }

  if (options->EntryNodes && !options->UseEntryGuards) {
    REJECT("If EntryNodes is set, UseEntryGuards must be enabled.");
  }

  if (!(options->UseEntryGuards) &&
      (options->RendConfigLines != NULL) &&
      !rend_service_allow_non_anonymous_connection(options)) {
    log_warn(LD_CONFIG,
             "UseEntryGuards is disabled, but you have configured one or more "
             "hidden services on this Tor instance.  Your hidden services "
             "will be very easy to locate using a well-known attack -- see "
             "http://freehaven.net/anonbib/#hs-attack06 for details.");
  }

  if (options->NumPrimaryGuards && options->NumEntryGuards &&
      options->NumEntryGuards > options->NumPrimaryGuards) {
    REJECT("NumEntryGuards must not be greater than NumPrimaryGuards.");
  }

  if (options->EntryNodes &&
      routerset_is_list(options->EntryNodes) &&
      (routerset_len(options->EntryNodes) == 1) &&
      (options->RendConfigLines != NULL)) {
    tor_asprintf(msg,
             "You have one single EntryNodes and at least one hidden service "
             "configured. This is bad because it's very easy to locate your "
             "entry guard which can then lead to the deanonymization of your "
             "hidden service -- for more details, see "
             "https://trac.torproject.org/projects/tor/ticket/14917. "
             "For this reason, the use of one EntryNodes with an hidden "
             "service is prohibited until a better solution is found.");
    return -1;
  }

  /* Inform the hidden service operator that pinning EntryNodes can possibly
   * be harmful for the service anonymity. */
  if (options->EntryNodes &&
      routerset_is_list(options->EntryNodes) &&
      (options->RendConfigLines != NULL)) {
    log_warn(LD_CONFIG,
             "EntryNodes is set with multiple entries and at least one "
             "hidden service is configured. Pinning entry nodes can possibly "
             "be harmful to the service anonymity. Because of this, we "
             "recommend you either don't do that or make sure you know what "
             "you are doing. For more details, please look at "
             "https://trac.torproject.org/projects/tor/ticket/21155.");
  }

  /* Single Onion Services: non-anonymous hidden services */
  if (rend_service_non_anonymous_mode_enabled(options)) {
    log_warn(LD_CONFIG,
             "HiddenServiceNonAnonymousMode is set. Every hidden service on "
             "this tor instance is NON-ANONYMOUS. If "
             "the HiddenServiceNonAnonymousMode option is changed, Tor will "
             "refuse to launch hidden services from the same directories, to "
             "protect your anonymity against config errors. This setting is "
             "for experimental use only.");
  }

  if (!options->LearnCircuitBuildTimeout && options->CircuitBuildTimeout &&
      options->CircuitBuildTimeout < RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT) {
    log_warn(LD_CONFIG,
        "CircuitBuildTimeout is shorter (%d seconds) than the recommended "
        "minimum (%d seconds), and LearnCircuitBuildTimeout is disabled.  "
        "If tor isn't working, raise this value or enable "
        "LearnCircuitBuildTimeout.",
        options->CircuitBuildTimeout,
        RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT );
  } else if (!options->LearnCircuitBuildTimeout &&
             !options->CircuitBuildTimeout) {
    int severity = LOG_NOTICE;
    /* Be a little quieter if we've deliberately disabled
     * LearnCircuitBuildTimeout. */
    if (circuit_build_times_disabled_(options, 1)) {
      severity = LOG_INFO;
    }
    log_fn(severity, LD_CONFIG, "You disabled LearnCircuitBuildTimeout, but "
           "didn't specify a CircuitBuildTimeout. I'll pick a plausible "
           "default.");
  }

  if (options->DormantClientTimeout < 10*60 && !options->TestingTorNetwork) {
    REJECT("DormantClientTimeout is too low. It must be at least 10 minutes.");
  }

  if (options->PathBiasNoticeRate > 1.0) {
    tor_asprintf(msg,
              "PathBiasNoticeRate is too high. "
              "It must be between 0 and 1.0");
    return -1;
  }
  if (options->PathBiasWarnRate > 1.0) {
    tor_asprintf(msg,
              "PathBiasWarnRate is too high. "
              "It must be between 0 and 1.0");
    return -1;
  }
  if (options->PathBiasExtremeRate > 1.0) {
    tor_asprintf(msg,
              "PathBiasExtremeRate is too high. "
              "It must be between 0 and 1.0");
    return -1;
  }
  if (options->PathBiasNoticeUseRate > 1.0) {
    tor_asprintf(msg,
              "PathBiasNoticeUseRate is too high. "
              "It must be between 0 and 1.0");
    return -1;
  }
  if (options->PathBiasExtremeUseRate > 1.0) {
    tor_asprintf(msg,
              "PathBiasExtremeUseRate is too high. "
              "It must be between 0 and 1.0");
    return -1;
  }

  if (options->MaxCircuitDirtiness < MIN_MAX_CIRCUIT_DIRTINESS) {
    log_warn(LD_CONFIG, "MaxCircuitDirtiness option is too short; "
             "raising to %d seconds.", MIN_MAX_CIRCUIT_DIRTINESS);
    options->MaxCircuitDirtiness = MIN_MAX_CIRCUIT_DIRTINESS;
  }

  if (options->MaxCircuitDirtiness > MAX_MAX_CIRCUIT_DIRTINESS) {
    log_warn(LD_CONFIG, "MaxCircuitDirtiness option is too high; "
             "setting to %d days.", MAX_MAX_CIRCUIT_DIRTINESS/86400);
    options->MaxCircuitDirtiness = MAX_MAX_CIRCUIT_DIRTINESS;
  }

  if (options->CircuitStreamTimeout &&
      options->CircuitStreamTimeout < MIN_CIRCUIT_STREAM_TIMEOUT) {
    log_warn(LD_CONFIG, "CircuitStreamTimeout option is too short; "
             "raising to %d seconds.", MIN_CIRCUIT_STREAM_TIMEOUT);
    options->CircuitStreamTimeout = MIN_CIRCUIT_STREAM_TIMEOUT;
  }

  if (options->HeartbeatPeriod &&
      options->HeartbeatPeriod < MIN_HEARTBEAT_PERIOD &&
      !options->TestingTorNetwork) {
    log_warn(LD_CONFIG, "HeartbeatPeriod option is too short; "
             "raising to %d seconds.", MIN_HEARTBEAT_PERIOD);
    options->HeartbeatPeriod = MIN_HEARTBEAT_PERIOD;
  }

  if (options->KeepalivePeriod < 1)
    REJECT("KeepalivePeriod option must be positive.");

  if (ensure_bandwidth_cap(&options->BandwidthRate,
                           "BandwidthRate", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->BandwidthBurst,
                           "BandwidthBurst", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->MaxAdvertisedBandwidth,
                           "MaxAdvertisedBandwidth", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->RelayBandwidthRate,
                           "RelayBandwidthRate", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->RelayBandwidthBurst,
                           "RelayBandwidthBurst", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->PerConnBWRate,
                           "PerConnBWRate", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->PerConnBWBurst,
                           "PerConnBWBurst", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->AuthDirFastGuarantee,
                           "AuthDirFastGuarantee", msg) < 0)
    return -1;
  if (ensure_bandwidth_cap(&options->AuthDirGuardBWGuarantee,
                           "AuthDirGuardBWGuarantee", msg) < 0)
    return -1;

  if (options->RelayBandwidthRate && !options->RelayBandwidthBurst)
    options->RelayBandwidthBurst = options->RelayBandwidthRate;
  if (options->RelayBandwidthBurst && !options->RelayBandwidthRate)
    options->RelayBandwidthRate = options->RelayBandwidthBurst;

  if (server_mode(options)) {
    const unsigned required_min_bw =
      public_server_mode(options) ?
       RELAY_REQUIRED_MIN_BANDWIDTH : BRIDGE_REQUIRED_MIN_BANDWIDTH;
    const char * const optbridge =
      public_server_mode(options) ? "" : "bridge ";
    if (options->BandwidthRate < required_min_bw) {
      tor_asprintf(msg,
                       "BandwidthRate is set to %d bytes/second. "
                       "For %sservers, it must be at least %u.",
                       (int)options->BandwidthRate, optbridge,
                       required_min_bw);
      return -1;
    } else if (options->MaxAdvertisedBandwidth <
               required_min_bw/2) {
      tor_asprintf(msg,
                       "MaxAdvertisedBandwidth is set to %d bytes/second. "
                       "For %sservers, it must be at least %u.",
                       (int)options->MaxAdvertisedBandwidth, optbridge,
                       required_min_bw/2);
      return -1;
    }
    if (options->RelayBandwidthRate &&
      options->RelayBandwidthRate < required_min_bw) {
      tor_asprintf(msg,
                       "RelayBandwidthRate is set to %d bytes/second. "
                       "For %sservers, it must be at least %u.",
                       (int)options->RelayBandwidthRate, optbridge,
                       required_min_bw);
      return -1;
    }
  }

  if (options->RelayBandwidthRate > options->RelayBandwidthBurst)
    REJECT("RelayBandwidthBurst must be at least equal "
           "to RelayBandwidthRate.");

  if (options->BandwidthRate > options->BandwidthBurst)
    REJECT("BandwidthBurst must be at least equal to BandwidthRate.");

  /* if they set relaybandwidth* really high but left bandwidth*
   * at the default, raise the defaults. */
  if (options->RelayBandwidthRate > options->BandwidthRate)
    options->BandwidthRate = options->RelayBandwidthRate;
  if (options->RelayBandwidthBurst > options->BandwidthBurst)
    options->BandwidthBurst = options->RelayBandwidthBurst;

  if (accounting_parse_options(options, 1)<0)
    REJECT("Failed to parse accounting options. See logs for details.");

  if (options->AccountingMax) {
    if (options->RendConfigLines && server_mode(options)) {
      log_warn(LD_CONFIG, "Using accounting with a hidden service and an "
               "ORPort is risky: your hidden service(s) and your public "
               "address will all turn off at the same time, which may alert "
               "observers that they are being run by the same party.");
    } else if (config_count_key(options->RendConfigLines,
                                "HiddenServiceDir") > 1) {
      log_warn(LD_CONFIG, "Using accounting with multiple hidden services is "
               "risky: they will all turn off at the same time, which may "
               "alert observers that they are being run by the same party.");
    }
  }

  options->AccountingRule = ACCT_MAX;
  if (options->AccountingRule_option) {
    if (!strcmp(options->AccountingRule_option, "sum"))
      options->AccountingRule = ACCT_SUM;
    else if (!strcmp(options->AccountingRule_option, "max"))
      options->AccountingRule = ACCT_MAX;
    else if (!strcmp(options->AccountingRule_option, "in"))
      options->AccountingRule = ACCT_IN;
    else if (!strcmp(options->AccountingRule_option, "out"))
      options->AccountingRule = ACCT_OUT;
    else
      REJECT("AccountingRule must be 'sum', 'max', 'in', or 'out'");
  }

  if (options->DirPort_set && !options->DirCache) {
    REJECT("DirPort configured but DirCache disabled. DirPort requires "
           "DirCache.");
  }

  if (options->BridgeRelay && !options->DirCache) {
    REJECT("We're a bridge but DirCache is disabled. BridgeRelay requires "
           "DirCache.");
  }

  if (server_mode(options)) {
    char *dircache_msg = NULL;
    if (have_enough_mem_for_dircache(options, 0, &dircache_msg)) {
      log_warn(LD_CONFIG, "%s", dircache_msg);
      tor_free(dircache_msg);
    }
  }

  if (options->HTTPProxy) { /* parse it now */
    if (tor_addr_port_lookup(options->HTTPProxy,
                        &options->HTTPProxyAddr, &options->HTTPProxyPort) < 0)
      REJECT("HTTPProxy failed to parse or resolve. Please fix.");
    if (options->HTTPProxyPort == 0) { /* give it a default */
      options->HTTPProxyPort = 80;
    }
  }

  if (options->HTTPProxyAuthenticator) {
    if (strlen(options->HTTPProxyAuthenticator) >= 512)
      REJECT("HTTPProxyAuthenticator is too long (>= 512 chars).");
  }

  if (options->HTTPSProxy) { /* parse it now */
    if (tor_addr_port_lookup(options->HTTPSProxy,
                        &options->HTTPSProxyAddr, &options->HTTPSProxyPort) <0)
      REJECT("HTTPSProxy failed to parse or resolve. Please fix.");
    if (options->HTTPSProxyPort == 0) { /* give it a default */
      options->HTTPSProxyPort = 443;
    }
  }

  if (options->HTTPSProxyAuthenticator) {
    if (strlen(options->HTTPSProxyAuthenticator) >= 512)
      REJECT("HTTPSProxyAuthenticator is too long (>= 512 chars).");
  }

  if (options->Socks4Proxy) { /* parse it now */
    if (tor_addr_port_lookup(options->Socks4Proxy,
                        &options->Socks4ProxyAddr,
                        &options->Socks4ProxyPort) <0)
      REJECT("Socks4Proxy failed to parse or resolve. Please fix.");
    if (options->Socks4ProxyPort == 0) { /* give it a default */
      options->Socks4ProxyPort = 1080;
    }
  }

  if (options->Socks5Proxy) { /* parse it now */
    if (tor_addr_port_lookup(options->Socks5Proxy,
                            &options->Socks5ProxyAddr,
                            &options->Socks5ProxyPort) <0)
      REJECT("Socks5Proxy failed to parse or resolve. Please fix.");
    if (options->Socks5ProxyPort == 0) { /* give it a default */
      options->Socks5ProxyPort = 1080;
    }
  }

  /* Check if more than one exclusive proxy type has been enabled. */
  if (!!options->Socks4Proxy + !!options->Socks5Proxy +
      !!options->HTTPSProxy > 1)
    REJECT("You have configured more than one proxy type. "
           "(Socks4Proxy|Socks5Proxy|HTTPSProxy)");

  /* Check if the proxies will give surprising behavior. */
  if (options->HTTPProxy && !(options->Socks4Proxy ||
                              options->Socks5Proxy ||
                              options->HTTPSProxy)) {
    log_warn(LD_CONFIG, "HTTPProxy configured, but no SOCKS proxy or "
             "HTTPS proxy configured. Watch out: this configuration will "
             "proxy unencrypted directory connections only.");
  }

  if (options->Socks5ProxyUsername) {
    size_t len;

    len = strlen(options->Socks5ProxyUsername);
    if (len < 1 || len > MAX_SOCKS5_AUTH_FIELD_SIZE)
      REJECT("Socks5ProxyUsername must be between 1 and 255 characters.");

    if (!options->Socks5ProxyPassword)
      REJECT("Socks5ProxyPassword must be included with Socks5ProxyUsername.");

    len = strlen(options->Socks5ProxyPassword);
    if (len < 1 || len > MAX_SOCKS5_AUTH_FIELD_SIZE)
      REJECT("Socks5ProxyPassword must be between 1 and 255 characters.");
  } else if (options->Socks5ProxyPassword)
    REJECT("Socks5ProxyPassword must be included with Socks5ProxyUsername.");

  if (options->HashedControlPassword) {
    smartlist_t *sl = decode_hashed_passwords(options->HashedControlPassword);
    if (!sl) {
      REJECT("Bad HashedControlPassword: wrong length or bad encoding");
    } else {
      SMARTLIST_FOREACH(sl, char*, cp, tor_free(cp));
      smartlist_free(sl);
    }
  }

  if (options->HashedControlSessionPassword) {
    smartlist_t *sl = decode_hashed_passwords(
                                  options->HashedControlSessionPassword);
    if (!sl) {
      REJECT("Bad HashedControlSessionPassword: wrong length or bad encoding");
    } else {
      SMARTLIST_FOREACH(sl, char*, cp, tor_free(cp));
      smartlist_free(sl);
    }
  }

  if (options->OwningControllerProcess) {
    const char *validate_pspec_msg = NULL;
    if (tor_validate_process_specifier(options->OwningControllerProcess,
                                       &validate_pspec_msg)) {
      tor_asprintf(msg, "Bad OwningControllerProcess: %s",
                   validate_pspec_msg);
      return -1;
    }
  }

  if ((options->ControlPort_set || world_writable_control_socket) &&
      !options->HashedControlPassword &&
      !options->HashedControlSessionPassword &&
      !options->CookieAuthentication) {
    log_warn(LD_CONFIG, "Control%s is %s, but no authentication method "
             "has been configured.  This means that any program on your "
             "computer can reconfigure your Tor.  That's bad!  You should "
             "upgrade your Tor controller as soon as possible.",
             options->ControlPort_set ? "Port" : "Socket",
             options->ControlPort_set ? "open" : "world writable");
  }

  if (options->CookieAuthFileGroupReadable && !options->CookieAuthFile) {
    log_warn(LD_CONFIG, "CookieAuthFileGroupReadable is set, but will have "
             "no effect: you must specify an explicit CookieAuthFile to "
             "have it group-readable.");
  }

  if (options->MyFamily_lines && options->BridgeRelay) {
    log_warn(LD_CONFIG, "Listing a family for a bridge relay is not "
             "supported: it can reveal bridge fingerprints to censors. "
             "You should also make sure you aren't listing this bridge's "
             "fingerprint in any other MyFamily.");
  }
  if (normalize_nickname_list(&options->MyFamily,
                              options->MyFamily_lines, "MyFamily", msg))
    return -1;
  for (cl = options->NodeFamilies; cl; cl = cl->next) {
    routerset_t *rs = routerset_new();
    if (routerset_parse(rs, cl->value, cl->key)) {
      routerset_free(rs);
      return -1;
    }
    routerset_free(rs);
  }

  if (validate_addr_policies(options, msg) < 0)
    return -1;

  /* If FallbackDir is set, we don't UseDefaultFallbackDirs */
  if (options->UseDefaultFallbackDirs && options->FallbackDir) {
    log_info(LD_CONFIG, "You have set UseDefaultFallbackDirs 1 and "
             "FallbackDir(s). Ignoring UseDefaultFallbackDirs, and "
             "using the FallbackDir(s) you have set.");
  }

  if (validate_dir_servers(options, old_options) < 0)
    REJECT("Directory authority/fallback line did not parse. See logs "
           "for details.");

  if (options->UseBridges && !options->Bridges)
    REJECT("If you set UseBridges, you must specify at least one bridge.");

  for (cl = options->Bridges; cl; cl = cl->next) {
      bridge_line_t *bridge_line = parse_bridge_line(cl->value);
      if (!bridge_line)
        REJECT("Bridge line did not parse. See logs for details.");
      bridge_line_free(bridge_line);
  }

  for (cl = options->ClientTransportPlugin; cl; cl = cl->next) {
    if (parse_transport_line(options, cl->value, 1, 0) < 0)
      REJECT("Invalid client transport line. See logs for details.");
  }

  for (cl = options->ServerTransportPlugin; cl; cl = cl->next) {
    if (parse_transport_line(options, cl->value, 1, 1) < 0)
      REJECT("Invalid server transport line. See logs for details.");
  }

  if (options->ServerTransportPlugin && !server_mode(options)) {
    log_notice(LD_GENERAL, "Tor is not configured as a relay but you specified"
               " a ServerTransportPlugin line (%s). The ServerTransportPlugin "
               "line will be ignored.",
               escaped(options->ServerTransportPlugin->value));
  }

  for (cl = options->ServerTransportListenAddr; cl; cl = cl->next) {
    char *bindaddr = get_bindaddr_from_transport_listen_line(cl->value, NULL);
    if (!bindaddr)
      REJECT("ServerTransportListenAddr did not parse. See logs for details.");
    tor_free(bindaddr);
  }

  if (options->ServerTransportListenAddr && !options->ServerTransportPlugin) {
    log_notice(LD_GENERAL, "You need at least a single managed-proxy to "
               "specify a transport listen address. The "
               "ServerTransportListenAddr line will be ignored.");
  }

  for (cl = options->ServerTransportOptions; cl; cl = cl->next) {
    smartlist_t *options_sl =
      get_options_from_transport_options_line(cl->value, NULL);
    if (!options_sl)
      REJECT("ServerTransportOptions did not parse. See logs for details.");

    SMARTLIST_FOREACH(options_sl, char *, cp, tor_free(cp));
    smartlist_free(options_sl);
  }

  if (options->ConstrainedSockets) {
    /* If the user wants to constrain socket buffer use, make sure the desired
     * limit is between MIN|MAX_TCPSOCK_BUFFER in k increments. */
    if (options->ConstrainedSockSize < MIN_CONSTRAINED_TCP_BUFFER ||
        options->ConstrainedSockSize > MAX_CONSTRAINED_TCP_BUFFER ||
        options->ConstrainedSockSize % 1024) {
      tor_asprintf(msg,
          "ConstrainedSockSize is invalid.  Must be a value between %d and %d "
          "in 1024 byte increments.",
          MIN_CONSTRAINED_TCP_BUFFER, MAX_CONSTRAINED_TCP_BUFFER);
      return -1;
    }
    if (options->DirPort_set) {
      /* Providing cached directory entries while system TCP buffers are scarce
       * will exacerbate the socket errors.  Suggest that this be disabled. */
      COMPLAIN("You have requested constrained socket buffers while also "
               "serving directory entries via DirPort.  It is strongly "
               "suggested that you disable serving directory requests when "
               "system TCP buffer resources are scarce.");
    }
  }

  if (options->V3AuthVoteDelay + options->V3AuthDistDelay >=
      options->V3AuthVotingInterval/2) {
    /*
    This doesn't work, but it seems like it should:
     what code is preventing the interval being less than twice the lead-up?
    if (options->TestingTorNetwork) {
      if (options->V3AuthVoteDelay + options->V3AuthDistDelay >=
          options->V3AuthVotingInterval) {
        REJECT("V3AuthVoteDelay plus V3AuthDistDelay must be less than "
               "V3AuthVotingInterval");
      } else {
        COMPLAIN("V3AuthVoteDelay plus V3AuthDistDelay is more than half "
                 "V3AuthVotingInterval. This may lead to "
                 "consensus instability, particularly if clocks drift.");
      }
    } else {
     */
      REJECT("V3AuthVoteDelay plus V3AuthDistDelay must be less than half "
             "V3AuthVotingInterval");
    /*
    }
     */
  }

  if (options->V3AuthVoteDelay < MIN_VOTE_SECONDS) {
    if (options->TestingTorNetwork) {
      if (options->V3AuthVoteDelay < MIN_VOTE_SECONDS_TESTING) {
        REJECT("V3AuthVoteDelay is way too low.");
      } else {
        COMPLAIN("V3AuthVoteDelay is very low. "
                 "This may lead to failure to vote for a consensus.");
      }
    } else {
      REJECT("V3AuthVoteDelay is way too low.");
    }
  }

  if (options->V3AuthDistDelay < MIN_DIST_SECONDS) {
    if (options->TestingTorNetwork) {
      if (options->V3AuthDistDelay < MIN_DIST_SECONDS_TESTING) {
        REJECT("V3AuthDistDelay is way too low.");
      } else {
        COMPLAIN("V3AuthDistDelay is very low. "
                 "This may lead to missing votes in a consensus.");
      }
    } else {
      REJECT("V3AuthDistDelay is way too low.");
    }
  }

  if (options->V3AuthNIntervalsValid < 2)
    REJECT("V3AuthNIntervalsValid must be at least 2.");

  if (options->V3AuthVotingInterval < MIN_VOTE_INTERVAL) {
    if (options->TestingTorNetwork) {
      if (options->V3AuthVotingInterval < MIN_VOTE_INTERVAL_TESTING) {
        REJECT("V3AuthVotingInterval is insanely low.");
      } else {
        COMPLAIN("V3AuthVotingInterval is very low. "
                 "This may lead to failure to synchronise for a consensus.");
      }
    } else {
      REJECT("V3AuthVotingInterval is insanely low.");
    }
  } else if (options->V3AuthVotingInterval > 24*60*60) {
    REJECT("V3AuthVotingInterval is insanely high.");
  } else if (((24*60*60) % options->V3AuthVotingInterval) != 0) {
    COMPLAIN("V3AuthVotingInterval does not divide evenly into 24 hours.");
  }

  if (hs_config_service_all(options, 1) < 0)
    REJECT("Failed to configure rendezvous options. See logs for details.");

  /* Parse client-side authorization for hidden services. */
  if (hs_config_client_auth_all(options, 1) < 0)
    REJECT("Failed to configure client authorization for hidden services. "
           "See logs for details.");

  if (parse_virtual_addr_network(options->VirtualAddrNetworkIPv4,
                                 AF_INET, 1, msg)<0)
    return -1;
  if (parse_virtual_addr_network(options->VirtualAddrNetworkIPv6,
                                 AF_INET6, 1, msg)<0)
    return -1;

  if (options->TestingTorNetwork &&
      !(options->DirAuthorities ||
        (options->AlternateDirAuthority &&
         options->AlternateBridgeAuthority))) {
    REJECT("TestingTorNetwork may only be configured in combination with "
           "a non-default set of DirAuthority or both of "
           "AlternateDirAuthority and AlternateBridgeAuthority configured.");
  }

#define CHECK_DEFAULT(arg)                                              \
  STMT_BEGIN                                                            \
    if (!options->TestingTorNetwork &&                                  \
        !options->UsingTestNetworkDefaults_ &&                          \
        !config_is_same(&options_format,options,                        \
                        default_options,#arg)) {                        \
      REJECT(#arg " may only be changed in testing Tor "                \
             "networks!");                                              \
    } STMT_END
  CHECK_DEFAULT(TestingV3AuthInitialVotingInterval);
  CHECK_DEFAULT(TestingV3AuthInitialVoteDelay);
  CHECK_DEFAULT(TestingV3AuthInitialDistDelay);
  CHECK_DEFAULT(TestingV3AuthVotingStartOffset);
  CHECK_DEFAULT(TestingAuthDirTimeToLearnReachability);
  CHECK_DEFAULT(TestingEstimatedDescriptorPropagationTime);
  CHECK_DEFAULT(TestingServerDownloadInitialDelay);
  CHECK_DEFAULT(TestingClientDownloadInitialDelay);
  CHECK_DEFAULT(TestingServerConsensusDownloadInitialDelay);
  CHECK_DEFAULT(TestingClientConsensusDownloadInitialDelay);
  CHECK_DEFAULT(TestingBridgeDownloadInitialDelay);
  CHECK_DEFAULT(TestingBridgeBootstrapDownloadInitialDelay);
  CHECK_DEFAULT(TestingClientMaxIntervalWithoutRequest);
  CHECK_DEFAULT(TestingDirConnectionMaxStall);
  CHECK_DEFAULT(TestingAuthKeyLifetime);
  CHECK_DEFAULT(TestingLinkCertLifetime);
  CHECK_DEFAULT(TestingSigningKeySlop);
  CHECK_DEFAULT(TestingAuthKeySlop);
  CHECK_DEFAULT(TestingLinkKeySlop);
#undef CHECK_DEFAULT

  if (!options->ClientDNSRejectInternalAddresses &&
      !(options->DirAuthorities ||
        (options->AlternateDirAuthority && options->AlternateBridgeAuthority)))
    REJECT("ClientDNSRejectInternalAddresses used for default network.");
  if (options->SigningKeyLifetime < options->TestingSigningKeySlop*2)
    REJECT("SigningKeyLifetime is too short.");
  if (options->TestingLinkCertLifetime < options->TestingAuthKeySlop*2)
    REJECT("LinkCertLifetime is too short.");
  if (options->TestingAuthKeyLifetime < options->TestingLinkKeySlop*2)
    REJECT("TestingAuthKeyLifetime is too short.");

  if (options->TestingV3AuthInitialVotingInterval
      < MIN_VOTE_INTERVAL_TESTING_INITIAL) {
    REJECT("TestingV3AuthInitialVotingInterval is insanely low.");
  } else if (((30*60) % options->TestingV3AuthInitialVotingInterval) != 0) {
    REJECT("TestingV3AuthInitialVotingInterval does not divide evenly into "
           "30 minutes.");
  }

  if (options->TestingV3AuthInitialVoteDelay < MIN_VOTE_SECONDS_TESTING) {
    REJECT("TestingV3AuthInitialVoteDelay is way too low.");
  }

  if (options->TestingV3AuthInitialDistDelay < MIN_DIST_SECONDS_TESTING) {
    REJECT("TestingV3AuthInitialDistDelay is way too low.");
  }

  if (options->TestingV3AuthInitialVoteDelay +
      options->TestingV3AuthInitialDistDelay >=
      options->TestingV3AuthInitialVotingInterval) {
    REJECT("TestingV3AuthInitialVoteDelay plus TestingV3AuthInitialDistDelay "
           "must be less than TestingV3AuthInitialVotingInterval");
  }

  if (options->TestingV3AuthVotingStartOffset >
      MIN(options->TestingV3AuthInitialVotingInterval,
          options->V3AuthVotingInterval)) {
    REJECT("TestingV3AuthVotingStartOffset is higher than the voting "
           "interval.");
  } else if (options->TestingV3AuthVotingStartOffset < 0) {
    REJECT("TestingV3AuthVotingStartOffset must be non-negative.");
  }

  if (options->TestingAuthDirTimeToLearnReachability < 0) {
    REJECT("TestingAuthDirTimeToLearnReachability must be non-negative.");
  } else if (options->TestingAuthDirTimeToLearnReachability > 2*60*60) {
    COMPLAIN("TestingAuthDirTimeToLearnReachability is insanely high.");
  }

  if (options->TestingEstimatedDescriptorPropagationTime < 0) {
    REJECT("TestingEstimatedDescriptorPropagationTime must be non-negative.");
  } else if (options->TestingEstimatedDescriptorPropagationTime > 60*60) {
    COMPLAIN("TestingEstimatedDescriptorPropagationTime is insanely high.");
  }

  if (options->TestingClientMaxIntervalWithoutRequest < 1) {
    REJECT("TestingClientMaxIntervalWithoutRequest is way too low.");
  } else if (options->TestingClientMaxIntervalWithoutRequest > 3600) {
    COMPLAIN("TestingClientMaxIntervalWithoutRequest is insanely high.");
  }

  if (options->TestingDirConnectionMaxStall < 5) {
    REJECT("TestingDirConnectionMaxStall is way too low.");
  } else if (options->TestingDirConnectionMaxStall > 3600) {
    COMPLAIN("TestingDirConnectionMaxStall is insanely high.");
  }

  if (options->ClientBootstrapConsensusMaxInProgressTries < 1) {
    REJECT("ClientBootstrapConsensusMaxInProgressTries must be greater "
           "than 0.");
  } else if (options->ClientBootstrapConsensusMaxInProgressTries
             > 100) {
    COMPLAIN("ClientBootstrapConsensusMaxInProgressTries is insanely "
             "high.");
  }

  if (options->TestingEnableConnBwEvent &&
      !options->TestingTorNetwork && !options->UsingTestNetworkDefaults_) {
    REJECT("TestingEnableConnBwEvent may only be changed in testing "
           "Tor networks!");
  }

  if (options->TestingEnableCellStatsEvent &&
      !options->TestingTorNetwork && !options->UsingTestNetworkDefaults_) {
    REJECT("TestingEnableCellStatsEvent may only be changed in testing "
           "Tor networks!");
  }

  if (options->TestingTorNetwork) {
    log_warn(LD_CONFIG, "TestingTorNetwork is set. This will make your node "
                        "almost unusable in the public Tor network, and is "
                        "therefore only advised if you are building a "
                        "testing Tor network!");
  }

  if (options->AccelName && !options->HardwareAccel)
    options->HardwareAccel = 1;
  if (options->AccelDir && !options->AccelName)
    REJECT("Can't use hardware crypto accelerator dir without engine name.");

  if (options->PublishServerDescriptor)
    SMARTLIST_FOREACH(options->PublishServerDescriptor, const char *, pubdes, {
      if (!strcmp(pubdes, "1") || !strcmp(pubdes, "0"))
        if (smartlist_len(options->PublishServerDescriptor) > 1) {
          COMPLAIN("You have passed a list of multiple arguments to the "
                   "PublishServerDescriptor option that includes 0 or 1. "
                   "0 or 1 should only be used as the sole argument. "
                   "This configuration will be rejected in a future release.");
          break;
        }
    });

  if (options->BridgeRelay == 1 && ! options->ORPort_set)
      REJECT("BridgeRelay is 1, ORPort is not set. This is an invalid "
             "combination.");

  if (options_validate_scheduler(options, msg) < 0) {
    return -1;
  }

  return 0;
}

#undef REJECT
#undef COMPLAIN

/* Given the value that the user has set for MaxMemInQueues, compute the
 * actual maximum value.  We clip this value if it's too low, and autodetect
 * it if it's set to 0. */
STATIC uint64_t
compute_real_max_mem_in_queues(const uint64_t val, int log_guess)
{
  uint64_t result;

  if (val == 0) {
#define ONE_GIGABYTE (UINT64_C(1) << 30)
#define ONE_MEGABYTE (UINT64_C(1) << 20)
    /* The user didn't pick a memory limit.  Choose a very large one
     * that is still smaller than the system memory */
    static int notice_sent = 0;
    size_t ram = 0;
    if (get_total_system_memory(&ram) < 0) {
      /* We couldn't determine our total system memory!  */
#if SIZEOF_VOID_P >= 8
      /* 64-bit system.  Let's hope for 8 GB. */
      result = 8 * ONE_GIGABYTE;
#else
      /* (presumably) 32-bit system. Let's hope for 1 GB. */
      result = ONE_GIGABYTE;
#endif /* SIZEOF_VOID_P >= 8 */
    } else {
      /* We detected the amount of memory available. */
      uint64_t avail = 0;

#if SIZEOF_SIZE_T > 4
/* On a 64-bit platform, we consider 8GB "very large". */
#define RAM_IS_VERY_LARGE(x) ((x) >= (8 * ONE_GIGABYTE))
#else
/* On a 32-bit platform, we can't have 8GB of ram. */
#define RAM_IS_VERY_LARGE(x) (0)
#endif

      if (RAM_IS_VERY_LARGE(ram)) {
        /* If we have 8 GB, or more, RAM available, we set the MaxMemInQueues
         * to 0.4 * RAM. The idea behind this value is that the amount of RAM
         * is more than enough for a single relay and should allow the relay
         * operator to run two relays if they have additional bandwidth
         * available.
         */
        avail = (ram / 5) * 2;
      } else {
        /* If we have less than 8 GB of RAM available, we use the "old" default
         * for MaxMemInQueues of 0.75 * RAM.
         */
        avail = (ram / 4) * 3;
      }

      /* Make sure it's in range from 0.25 GB to 8 GB for 64-bit and 0.25 to 2
       * GB for 32-bit. */
      if (avail > MAX_DEFAULT_MEMORY_QUEUE_SIZE) {
        /* If you want to use more than this much RAM, you need to configure
           it yourself */
        result = MAX_DEFAULT_MEMORY_QUEUE_SIZE;
      } else if (avail < ONE_GIGABYTE / 4) {
        result = ONE_GIGABYTE / 4;
      } else {
        result = avail;
      }
    }
    if (log_guess && ! notice_sent) {
      log_notice(LD_CONFIG, "%sMaxMemInQueues is set to %"PRIu64" MB. "
                 "You can override this by setting MaxMemInQueues by hand.",
                 ram ? "Based on detected system memory, " : "",
                 (result / ONE_MEGABYTE));
      notice_sent = 1;
    }
    return result;
  } else if (val < ONE_GIGABYTE / 4) {
    log_warn(LD_CONFIG, "MaxMemInQueues must be at least 256 MB for now. "
             "Ideally, have it as large as you can afford.");
    return ONE_GIGABYTE / 4;
  } else {
    /* The value was fine all along */
    return val;
  }
}

/* If we have less than 300 MB suggest disabling dircache */
#define DIRCACHE_MIN_MEM_MB 300
#define DIRCACHE_MIN_MEM_BYTES (DIRCACHE_MIN_MEM_MB*ONE_MEGABYTE)
#define STRINGIFY(val) #val

STATIC int
have_enough_mem_for_dircache(const or_options_t *options, size_t total_mem,
                             char **msg)
{
  *msg = NULL;
  /* XXX We should possibly be looking at MaxMemInQueues here
   * unconditionally.  Or we should believe total_mem unconditionally. */
  if (total_mem == 0) {
    if (get_total_system_memory(&total_mem) < 0) {
      total_mem = options->MaxMemInQueues >= SIZE_MAX ?
        SIZE_MAX : (size_t)options->MaxMemInQueues;
    }
  }
  if (options->DirCache) {
    if (total_mem < DIRCACHE_MIN_MEM_BYTES) {
      if (options->BridgeRelay) {
        tor_asprintf(msg, "Running a Bridge with less than %d MB of memory "
                       "is not recommended.", DIRCACHE_MIN_MEM_MB);
      } else {
        tor_asprintf(msg, "Being a directory cache (default) with less than "
                       "%d MB of memory is not recommended and may consume "
                       "most of the available resources. Consider disabling "
                       "this functionality by setting the DirCache option "
                       "to 0.", DIRCACHE_MIN_MEM_MB);
      }
    }
  } else {
    if (total_mem >= DIRCACHE_MIN_MEM_BYTES) {
      *msg = tor_strdup("DirCache is disabled and we are configured as a "
               "relay. We will not become a Guard.");
    }
  }
  return *msg == NULL ? 0 : -1;
}
#undef STRINGIFY

static int
opt_streq(const char *s1, const char *s2)
{
  return 0 == strcmp_opt(s1, s2);
}

static int
options_transition_allowed(const or_options_t *old,
                           const or_options_t *new_val,
                           char **msg)
{
  if (!old)
    return 0;

#define BAD_CHANGE_TO(opt, how) do {                                    \
    *msg = tor_strdup("While Tor is running"how", changing " #opt       \
                      " is not allowed");                               \
    return -1;                                                          \
  } while (0)

#define NO_CHANGE_BOOL(opt) \
  if (! CFG_EQ_BOOL(old, new_val, opt)) BAD_CHANGE_TO(opt,"")
#define NO_CHANGE_INT(opt) \
  if (! CFG_EQ_INT(old, new_val, opt)) BAD_CHANGE_TO(opt,"")
#define NO_CHANGE_STRING(opt) \
  if (! CFG_EQ_STRING(old, new_val, opt)) BAD_CHANGE_TO(opt,"")

  NO_CHANGE_STRING(PidFile);
  NO_CHANGE_BOOL(RunAsDaemon);
  NO_CHANGE_BOOL(Sandbox);
  NO_CHANGE_STRING(DataDirectory);
  NO_CHANGE_STRING(KeyDirectory);
  NO_CHANGE_STRING(CacheDirectory);
  NO_CHANGE_STRING(User);
  NO_CHANGE_BOOL(KeepBindCapabilities);
  NO_CHANGE_STRING(SyslogIdentityTag);
  NO_CHANGE_STRING(AndroidIdentityTag);
  NO_CHANGE_BOOL(HardwareAccel);
  NO_CHANGE_STRING(AccelName);
  NO_CHANGE_STRING(AccelDir);
  NO_CHANGE_BOOL(TestingTorNetwork);
  NO_CHANGE_BOOL(DisableAllSwap);
  NO_CHANGE_INT(TokenBucketRefillInterval);
  NO_CHANGE_BOOL(HiddenServiceSingleHopMode);
  NO_CHANGE_BOOL(HiddenServiceNonAnonymousMode);
  NO_CHANGE_BOOL(DisableDebuggerAttachment);
  NO_CHANGE_BOOL(NoExec);
  NO_CHANGE_INT(OwningControllerFD);
  NO_CHANGE_BOOL(DisableSignalHandlers);

  if (sandbox_is_active()) {
#define SB_NOCHANGE_STR(opt)                      \
    if (! CFG_EQ_STRING(old, new_val, opt))       \
      BAD_CHANGE_TO(opt," with Sandbox active")
#define SB_NOCHANGE_LINELIST(opt)                  \
    if (! CFG_EQ_LINELIST(old, new_val, opt))      \
      BAD_CHANGE_TO(opt," with Sandbox active")
#define SB_NOCHANGE_INT(opt)                       \
    if (! CFG_EQ_INT(old, new_val, opt))           \
      BAD_CHANGE_TO(opt," with Sandbox active")

    SB_NOCHANGE_STR(Address);
    SB_NOCHANGE_STR(ServerDNSResolvConfFile);
    SB_NOCHANGE_STR(DirPortFrontPage);
    SB_NOCHANGE_STR(CookieAuthFile);
    SB_NOCHANGE_STR(ExtORPortCookieAuthFile);
    SB_NOCHANGE_LINELIST(Logs);
    SB_NOCHANGE_INT(ConnLimit);

    if (server_mode(old) != server_mode(new_val)) {
      *msg = tor_strdup("Can't start/stop being a server while "
                        "Sandbox is active");
      return -1;
    }
  }

#undef SB_NOCHANGE_LINELIST
#undef SB_NOCHANGE_STR
#undef SB_NOCHANGE_INT
#undef BAD_CHANGE_TO
#undef NO_CHANGE_BOOL
#undef NO_CHANGE_INT
#undef NO_CHANGE_STRING
  return 0;
}

static int
options_transition_affects_workers(const or_options_t *old_options,
                                   const or_options_t *new_options)
{
  YES_IF_CHANGED_STRING(DataDirectory);
  YES_IF_CHANGED_INT(NumCPUs);
  YES_IF_CHANGED_LINELIST(ORPort_lines);
  YES_IF_CHANGED_BOOL(ServerDNSSearchDomains);
  YES_IF_CHANGED_BOOL(SafeLogging_);
  YES_IF_CHANGED_BOOL(ClientOnly);
  YES_IF_CHANGED_BOOL(LogMessageDomains);
  YES_IF_CHANGED_LINELIST(Logs);

  if (server_mode(old_options) != server_mode(new_options) ||
      public_server_mode(old_options) != public_server_mode(new_options) ||
      dir_server_mode(old_options) != dir_server_mode(new_options))
    return 1;

  /* Nothing that changed matters. */
  return 0;
}

static int
options_transition_affects_descriptor(const or_options_t *old_options,
                                      const or_options_t *new_options)
{
  /* XXX We can be smarter here. If your DirPort isn't being
   * published and you just turned it off, no need to republish. Etc. */

  YES_IF_CHANGED_STRING(DataDirectory);
  YES_IF_CHANGED_STRING(Nickname);
  YES_IF_CHANGED_STRING(Address);
  YES_IF_CHANGED_LINELIST(ExitPolicy);
  YES_IF_CHANGED_BOOL(ExitRelay);
  YES_IF_CHANGED_BOOL(ExitPolicyRejectPrivate);
  YES_IF_CHANGED_BOOL(ExitPolicyRejectLocalInterfaces);
  YES_IF_CHANGED_BOOL(IPv6Exit);
  YES_IF_CHANGED_LINELIST(ORPort_lines);
  YES_IF_CHANGED_LINELIST(DirPort_lines);
  YES_IF_CHANGED_LINELIST(DirPort_lines);
  YES_IF_CHANGED_BOOL(ClientOnly);
  YES_IF_CHANGED_BOOL(DisableNetwork);
  YES_IF_CHANGED_BOOL(PublishServerDescriptor_);
  YES_IF_CHANGED_STRING(ContactInfo);
  YES_IF_CHANGED_STRING(BridgeDistribution);
  YES_IF_CHANGED_LINELIST(MyFamily);
  YES_IF_CHANGED_STRING(AccountingStart);
  YES_IF_CHANGED_INT(AccountingMax);
  YES_IF_CHANGED_INT(AccountingRule);
  YES_IF_CHANGED_BOOL(DirCache);
  YES_IF_CHANGED_BOOL(AssumeReachable);

  if (get_effective_bwrate(old_options) != get_effective_bwrate(new_options) ||
      get_effective_bwburst(old_options) !=
        get_effective_bwburst(new_options) ||
      public_server_mode(old_options) != public_server_mode(new_options))
    return 1;

  return 0;
}

#ifdef _WIN32

static char *
get_windows_conf_root(void)
{
  static int is_set = 0;
  static char path[MAX_PATH*2+1];
  TCHAR tpath[MAX_PATH] = {0};

  LPITEMIDLIST idl;
  IMalloc *m;
  HRESULT result;

  if (is_set)
    return path;

  /* Find X:\documents and settings\username\application data\ .
   * We would use SHGetSpecialFolder path, but that wasn't added until IE4.
   */
#ifdef ENABLE_LOCAL_APPDATA
#define APPDATA_PATH CSIDL_LOCAL_APPDATA
#else
#define APPDATA_PATH CSIDL_APPDATA
#endif
  if (!SUCCEEDED(SHGetSpecialFolderLocation(NULL, APPDATA_PATH, &idl))) {
    getcwd(path,MAX_PATH);
    is_set = 1;
    log_warn(LD_CONFIG,
             "I couldn't find your application data folder: are you "
             "running an ancient version of Windows 95? Defaulting to \"%s\"",
             path);
    return path;
  }
  /* Convert the path from an "ID List" (whatever that is!) to a path. */
  result = SHGetPathFromIDList(idl, tpath);
#ifdef UNICODE
  wcstombs(path,tpath,sizeof(path));
  path[sizeof(path)-1] = '\0';
#else
  strlcpy(path,tpath,sizeof(path));
#endif /* defined(UNICODE) */

  /* Now we need to free the memory that the path-idl was stored in.  In
   * typical Windows fashion, we can't just call 'free()' on it. */
  SHGetMalloc(&m);
  if (m) {
    m->lpVtbl->Free(m, idl);
    m->lpVtbl->Release(m);
  }
  if (!SUCCEEDED(result)) {
    return NULL;
  }
  strlcat(path,"\\tor",MAX_PATH);
  is_set = 1;
  return path;
}
#endif /* defined(_WIN32) */

static const char *
get_default_conf_file(int defaults_file)
{
#ifdef DISABLE_SYSTEM_TORRC
  (void) defaults_file;
  return NULL;
#elif defined(_WIN32)
  if (defaults_file) {
    static char defaults_path[MAX_PATH+1];
    tor_snprintf(defaults_path, MAX_PATH, "%s\\torrc-defaults",
                 get_windows_conf_root());
    return defaults_path;
  } else {
    static char path[MAX_PATH+1];
    tor_snprintf(path, MAX_PATH, "%s\\torrc",
                 get_windows_conf_root());
    return path;
  }
#else
  return defaults_file ? CONFDIR "/torrc-defaults" : CONFDIR "/torrc";
#endif /* defined(DISABLE_SYSTEM_TORRC) || ... */
}

static int
normalize_nickname_list(config_line_t **normalized_out,
                        const config_line_t *lst, const char *name,
                        char **msg)
{
  if (!lst)
    return 0;

  config_line_t *new_nicknames = NULL;
  config_line_t **new_nicknames_next = &new_nicknames;

  const config_line_t *cl;
  for (cl = lst; cl; cl = cl->next) {
    const char *line = cl->value;
    if (!line)
      continue;

    int valid_line = 1;
    smartlist_t *sl = smartlist_new();
    smartlist_split_string(sl, line, ",",
      SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK|SPLIT_STRIP_SPACE, 0);
    SMARTLIST_FOREACH_BEGIN(sl, char *, s)
    {
      char *normalized = NULL;
      if (!is_legal_nickname_or_hexdigest(s)) {
        // check if first char is dollar
        if (s[0] != '$') {
          // Try again but with a dollar symbol prepended
          char *prepended;
          tor_asprintf(&prepended, "$%s", s);

          if (is_legal_nickname_or_hexdigest(prepended)) {
            // The nickname is valid when it's prepended, set it as the
            // normalized version
            normalized = prepended;
          } else {
            // Still not valid, free and fallback to error message
            tor_free(prepended);
          }
        }

        if (!normalized) {
          tor_asprintf(msg, "Invalid nickname '%s' in %s line", s, name);
          valid_line = 0;
          break;
        }
      } else {
        normalized = tor_strdup(s);
      }

      config_line_t *next = tor_malloc_zero(sizeof(*next));
      next->key = tor_strdup(cl->key);
      next->value = normalized;
      next->next = NULL;

      *new_nicknames_next = next;
      new_nicknames_next = &next->next;
    } SMARTLIST_FOREACH_END(s);

    SMARTLIST_FOREACH(sl, char *, s, tor_free(s));
    smartlist_free(sl);

    if (!valid_line) {
      config_free_lines(new_nicknames);
      return -1;
    }
  }

  *normalized_out = new_nicknames;

  return 0;
}

static char *
find_torrc_filename(config_line_t *cmd_arg,
                    int defaults_file,
                    int *using_default_fname, int *ignore_missing_torrc)
{
  char *fname=NULL;
  config_line_t *p_index;
  const char *fname_opt = defaults_file ? "--defaults-torrc" : "-f";
  const char *ignore_opt = defaults_file ? NULL : "--ignore-missing-torrc";

  if (defaults_file)
    *ignore_missing_torrc = 1;

  for (p_index = cmd_arg; p_index; p_index = p_index->next) {
    if (!strcmp(p_index->key, fname_opt)) {
      if (fname) {
        log_warn(LD_CONFIG, "Duplicate %s options on command line.",
            fname_opt);
        tor_free(fname);
      }
      fname = expand_filename(p_index->value);

      {
        char *absfname;
        absfname = make_path_absolute(fname);
        tor_free(fname);
        fname = absfname;
      }

      *using_default_fname = 0;
    } else if (ignore_opt && !strcmp(p_index->key,ignore_opt)) {
      *ignore_missing_torrc = 1;
    }
  }

  if (*using_default_fname) {
    /* didn't find one, try CONFDIR */
    const char *dflt = get_default_conf_file(defaults_file);
    file_status_t st = file_status(dflt);
    if (dflt && (st == FN_FILE || st == FN_EMPTY)) {
      fname = tor_strdup(dflt);
    } else {
#ifndef _WIN32
      char *fn = NULL;
      if (!defaults_file) {
        fn = expand_filename("~/.torrc");
      }
      if (fn) {
        file_status_t hmst = file_status(fn);
        if (hmst == FN_FILE || hmst == FN_EMPTY || dflt == NULL) {
          fname = fn;
        } else {
          tor_free(fn);
          fname = tor_strdup(dflt);
        }
      } else {
        fname = dflt ? tor_strdup(dflt) : NULL;
      }
#else /* !(!defined(_WIN32)) */
      fname = dflt ? tor_strdup(dflt) : NULL;
#endif /* !defined(_WIN32) */
    }
  }
  return fname;
}

static char *
load_torrc_from_stdin(void)
{
   size_t sz_out;

   return read_file_to_str_until_eof(STDIN_FILENO,SIZE_MAX,&sz_out);
}

static char *
load_torrc_from_disk(config_line_t *cmd_arg, int defaults_file)
{
  char *fname=NULL;
  char *cf = NULL;
  int using_default_torrc = 1;
  int ignore_missing_torrc = 0;
  char **fname_var = defaults_file ? &torrc_defaults_fname : &torrc_fname;

  if (*fname_var == NULL) {
    fname = find_torrc_filename(cmd_arg, defaults_file,
                                &using_default_torrc, &ignore_missing_torrc);
    tor_free(*fname_var);
    *fname_var = fname;
  } else {
    fname = *fname_var;
  }
  log_debug(LD_CONFIG, "Opening config file \"%s\"", fname?fname:"<NULL>");

  /* Open config file */
  file_status_t st = fname ? file_status(fname) : FN_EMPTY;
  if (fname == NULL ||
      !(st == FN_FILE || st == FN_EMPTY) ||
      !(cf = read_file_to_str(fname,0,NULL))) {
    if (using_default_torrc == 1 || ignore_missing_torrc) {
      if (!defaults_file)
        log_notice(LD_CONFIG, "Configuration file \"%s\" not present, "
            "using reasonable defaults.", fname);
      tor_free(fname); /* sets fname to NULL */
      *fname_var = NULL;
      cf = tor_strdup("");
    } else {
      log_warn(LD_CONFIG,
          "Unable to open configuration file \"%s\".", fname);
      goto err;
    }
  } else {
    log_notice(LD_CONFIG, "Read configuration file \"%s\".", fname);
  }

  return cf;
 err:
  tor_free(fname);
  *fname_var = NULL;
  return NULL;
}

int
options_init_from_torrc(int argc, char **argv)
{
  char *cf=NULL, *cf_defaults=NULL;
  int command;
  int retval = -1;
  char *command_arg = NULL;
  char *errmsg=NULL;
  config_line_t *p_index = NULL;
  config_line_t *cmdline_only_options = NULL;

  /* Go through command-line variables */
  if (! have_parsed_cmdline) {
    /* Or we could redo the list every time we pass this place.
     * It does not really matter */
    if (config_parse_commandline(argc, argv, 0, &global_cmdline_options,
                                 &global_cmdline_only_options) < 0) {
      goto err;
    }
    have_parsed_cmdline = 1;
  }
  cmdline_only_options = global_cmdline_only_options;

  if (config_line_find(cmdline_only_options, "-h") ||
      config_line_find(cmdline_only_options, "--help")) {
    print_usage();
    return 1;
  }
  if (config_line_find(cmdline_only_options, "--list-torrc-options")) {
    /* For validating whether we've documented everything. */
    list_torrc_options();
    return 1;
  }
  if (config_line_find(cmdline_only_options, "--list-deprecated-options")) {
    /* For validating whether what we have deprecated really exists. */
    list_deprecated_options();
    return 1;
  }

  if (config_line_find(cmdline_only_options, "--version")) {
    printf("Tor version %s.\n",get_version());
    return 1;
  }

  if (config_line_find(cmdline_only_options, "--library-versions")) {
    printf("Tor version %s. \n", get_version());
    printf("Library versions\tCompiled\t\tRuntime\n");
    printf("Libevent\t\t%-15s\t\t%s\n",
                      tor_libevent_get_header_version_str(),
                      tor_libevent_get_version_str());
#ifdef ENABLE_OPENSSL
    printf("OpenSSL \t\t%-15s\t\t%s\n",
                      crypto_openssl_get_header_version_str(),
                      crypto_openssl_get_version_str());
#endif
#ifdef ENABLE_NSS
    printf("NSS \t\t%-15s\t\t%s\n",
           crypto_nss_get_header_version_str(),
           crypto_nss_get_version_str());
#endif
    if (tor_compress_supports_method(ZLIB_METHOD)) {
      printf("Zlib    \t\t%-15s\t\t%s\n",
                        tor_compress_version_str(ZLIB_METHOD),
                        tor_compress_header_version_str(ZLIB_METHOD));
    }
    if (tor_compress_supports_method(LZMA_METHOD)) {
      printf("Liblzma \t\t%-15s\t\t%s\n",
                        tor_compress_version_str(LZMA_METHOD),
                        tor_compress_header_version_str(LZMA_METHOD));
    }
    if (tor_compress_supports_method(ZSTD_METHOD)) {
      printf("Libzstd \t\t%-15s\t\t%s\n",
                        tor_compress_version_str(ZSTD_METHOD),
                        tor_compress_header_version_str(ZSTD_METHOD));
    }
    //TODO: Hex versions?
    return 1;
  }

  command = CMD_RUN_TOR;
  for (p_index = cmdline_only_options; p_index; p_index = p_index->next) {
    if (!strcmp(p_index->key,"--keygen")) {
      command = CMD_KEYGEN;
    } else if (!strcmp(p_index->key, "--key-expiration")) {
      command = CMD_KEY_EXPIRATION;
      command_arg = p_index->value;
    } else if (!strcmp(p_index->key,"--list-fingerprint")) {
      command = CMD_LIST_FINGERPRINT;
    } else if (!strcmp(p_index->key, "--hash-password")) {
      command = CMD_HASH_PASSWORD;
      command_arg = p_index->value;
    } else if (!strcmp(p_index->key, "--dump-config")) {
      command = CMD_DUMP_CONFIG;
      command_arg = p_index->value;
    } else if (!strcmp(p_index->key, "--verify-config")) {
      command = CMD_VERIFY_CONFIG;
    }
  }

  if (command == CMD_HASH_PASSWORD) {
    cf_defaults = tor_strdup("");
    cf = tor_strdup("");
  } else {
    cf_defaults = load_torrc_from_disk(cmdline_only_options, 1);

    const config_line_t *f_line = config_line_find(cmdline_only_options,
                                                   "-f");

    const int read_torrc_from_stdin =
    (f_line != NULL && strcmp(f_line->value, "-") == 0);

    if (read_torrc_from_stdin) {
      cf = load_torrc_from_stdin();
    } else {
      cf = load_torrc_from_disk(cmdline_only_options, 0);
    }

    if (!cf) {
      if (config_line_find(cmdline_only_options, "--allow-missing-torrc")) {
        cf = tor_strdup("");
      } else {
        goto err;
      }
    }
  }

  retval = options_init_from_string(cf_defaults, cf, command, command_arg,
                                    &errmsg);

  if (retval < 0)
    goto err;

  if (config_line_find(cmdline_only_options, "--no-passphrase")) {
    if (command == CMD_KEYGEN) {
      get_options_mutable()->keygen_force_passphrase = FORCE_PASSPHRASE_OFF;
    } else {
      log_err(LD_CONFIG, "--no-passphrase specified without --keygen!");
      retval = -1;
      goto err;
    }
  }

  if (config_line_find(cmdline_only_options, "--newpass")) {
    if (command == CMD_KEYGEN) {
      get_options_mutable()->change_key_passphrase = 1;
    } else {
      log_err(LD_CONFIG, "--newpass specified without --keygen!");
      retval = -1;
      goto err;
    }
  }

  {
    const config_line_t *fd_line = config_line_find(cmdline_only_options,
                                                    "--passphrase-fd");
    if (fd_line) {
      if (get_options()->keygen_force_passphrase == FORCE_PASSPHRASE_OFF) {
        log_err(LD_CONFIG, "--no-passphrase specified with --passphrase-fd!");
        retval = -1;
        goto err;
      } else if (command != CMD_KEYGEN) {
        log_err(LD_CONFIG, "--passphrase-fd specified without --keygen!");
        retval = -1;
        goto err;
      } else {
        const char *v = fd_line->value;
        int ok = 1;
        long fd = tor_parse_long(v, 10, 0, INT_MAX, &ok, NULL);
        if (fd < 0 || ok == 0) {
          log_err(LD_CONFIG, "Invalid --passphrase-fd value %s", escaped(v));
          retval = -1;
          goto err;
        }
        get_options_mutable()->keygen_passphrase_fd = (int)fd;
        get_options_mutable()->use_keygen_passphrase_fd = 1;
        get_options_mutable()->keygen_force_passphrase = FORCE_PASSPHRASE_ON;
      }
    }
  }

  {
    const config_line_t *key_line = config_line_find(cmdline_only_options,
                                                     "--master-key");
    if (key_line) {
      if (command != CMD_KEYGEN) {
        log_err(LD_CONFIG, "--master-key without --keygen!");
        retval = -1;
        goto err;
      } else {
        get_options_mutable()->master_key_fname = tor_strdup(key_line->value);
      }
    }
  }

 err:

  tor_free(cf);
  tor_free(cf_defaults);
  if (errmsg) {
    log_warn(LD_CONFIG,"%s", errmsg);
    tor_free(errmsg);
  }
  return retval < 0 ? -1 : 0;
}

setopt_err_t
options_init_from_string(const char *cf_defaults, const char *cf,
                         int command, const char *command_arg,
                         char **msg)
{
  or_options_t *oldoptions, *newoptions, *newdefaultoptions=NULL;
  config_line_t *cl;
  int retval;
  setopt_err_t err = SETOPT_ERR_MISC;
  int cf_has_include = 0;
  tor_assert(msg);

  oldoptions = global_options; /* get_options unfortunately asserts if
                                  this is the first time we run*/

  newoptions = tor_malloc_zero(sizeof(or_options_t));
  newoptions->magic_ = OR_OPTIONS_MAGIC;
  options_init(newoptions);
  newoptions->command = command;
  newoptions->command_arg = command_arg ? tor_strdup(command_arg) : NULL;

  smartlist_t *opened_files = smartlist_new();
  for (int i = 0; i < 2; ++i) {
    const char *body = i==0 ? cf_defaults : cf;
    if (!body)
      continue;

    /* get config lines, assign them */
    retval = config_get_lines_include(body, &cl, 1,
                                      body == cf ? &cf_has_include : NULL,
                                      opened_files);
    if (retval < 0) {
      err = SETOPT_ERR_PARSE;
      goto err;
    }
    retval = config_assign(&options_format, newoptions, cl,
                           CAL_WARN_DEPRECATIONS, msg);
    config_free_lines(cl);
    if (retval < 0) {
      err = SETOPT_ERR_PARSE;
      goto err;
    }
    if (i==0)
      newdefaultoptions = config_dup(&options_format, newoptions);
  }

  if (newdefaultoptions == NULL) {
    newdefaultoptions = config_dup(&options_format, global_default_options);
  }

  /* Go through command-line variables too */
  retval = config_assign(&options_format, newoptions,
                         global_cmdline_options, CAL_WARN_DEPRECATIONS, msg);
  if (retval < 0) {
    err = SETOPT_ERR_PARSE;
    goto err;
  }

  newoptions->IncludeUsed = cf_has_include;
  newoptions->FilesOpenedByIncludes = opened_files;

  /* If this is a testing network configuration, change defaults
   * for a list of dependent config options, re-initialize newoptions
   * with the new defaults, and assign all options to it second time. */
  if (newoptions->TestingTorNetwork) {
    /* XXXX this is a bit of a kludge.  perhaps there's a better way to do
     * this?  We could, for example, make the parsing algorithm do two passes
     * over the configuration.  If it finds any "suite" options like
     * TestingTorNetwork, it could change the defaults before its second pass.
     * Not urgent so long as this seems to work, but at any sign of trouble,
     * let's clean it up.  -NM */

    /* Change defaults. */
    for (int i = 0; testing_tor_network_defaults[i].name; ++i) {
      const config_var_t *new_var = &testing_tor_network_defaults[i];
      config_var_t *old_var =
          config_find_option_mutable(&options_format, new_var->name);
      tor_assert(new_var);
      tor_assert(old_var);
      old_var->initvalue = new_var->initvalue;

      if ((config_find_deprecation(&options_format, new_var->name))) {
        log_warn(LD_GENERAL, "Testing options override the deprecated "
                 "option %s. Is that intentional?",
                 new_var->name);
      }
    }

    /* Clear newoptions and re-initialize them with new defaults. */
    or_options_free(newoptions);
    or_options_free(newdefaultoptions);
    newdefaultoptions = NULL;
    newoptions = tor_malloc_zero(sizeof(or_options_t));
    newoptions->magic_ = OR_OPTIONS_MAGIC;
    options_init(newoptions);
    newoptions->command = command;
    newoptions->command_arg = command_arg ? tor_strdup(command_arg) : NULL;

    /* Assign all options a second time. */
    opened_files = smartlist_new();
    for (int i = 0; i < 2; ++i) {
      const char *body = i==0 ? cf_defaults : cf;
      if (!body)
        continue;

      /* get config lines, assign them */
      retval = config_get_lines_include(body, &cl, 1,
                                        body == cf ? &cf_has_include : NULL,
                                        opened_files);
      if (retval < 0) {
        err = SETOPT_ERR_PARSE;
        goto err;
      }
      retval = config_assign(&options_format, newoptions, cl, 0, msg);
      config_free_lines(cl);
      if (retval < 0) {
        err = SETOPT_ERR_PARSE;
        goto err;
      }
      if (i==0)
        newdefaultoptions = config_dup(&options_format, newoptions);
    }
    /* Assign command-line variables a second time too */
    retval = config_assign(&options_format, newoptions,
                           global_cmdline_options, 0, msg);
    if (retval < 0) {
      err = SETOPT_ERR_PARSE;
      goto err;
    }
  }

  newoptions->IncludeUsed = cf_has_include;
  in_option_validation = 1;
  newoptions->FilesOpenedByIncludes = opened_files;

  /* Validate newoptions */
  if (options_validate(oldoptions, newoptions, newdefaultoptions,
                       0, msg) < 0) {
    err = SETOPT_ERR_PARSE; /*XXX make this a separate return value.*/
    goto err;
  }

  if (options_transition_allowed(oldoptions, newoptions, msg) < 0) {
    err = SETOPT_ERR_TRANSITION;
    goto err;
  }
  in_option_validation = 0;

  if (set_options(newoptions, msg)) {
    err = SETOPT_ERR_SETTING;
    goto err; /* frees and replaces old options */
  }

  or_options_free(global_default_options);
  global_default_options = newdefaultoptions;

  return SETOPT_OK;

 err:
  in_option_validation = 0;
  if (opened_files) {
    SMARTLIST_FOREACH(opened_files, char *, f, tor_free(f));
    smartlist_free(opened_files);
  }
  // may have been set to opened_files, avoid double free
  newoptions->FilesOpenedByIncludes = NULL;
  or_options_free(newoptions);
  or_options_free(newdefaultoptions);
  if (*msg) {
    char *old_msg = *msg;
    tor_asprintf(msg, "Failed to parse/validate config: %s", old_msg);
    tor_free(old_msg);
  }
  return err;
}

const char *
get_torrc_fname(int defaults_fname)
{
  const char *fname = defaults_fname ? torrc_defaults_fname : torrc_fname;

  if (fname)
    return fname;
  else
    return get_default_conf_file(defaults_fname);
}

void
config_register_addressmaps(const or_options_t *options)
{
  smartlist_t *elts;
  config_line_t *opt;
  const char *from, *to, *msg;

  addressmap_clear_configured();
  elts = smartlist_new();
  for (opt = options->AddressMap; opt; opt = opt->next) {
    smartlist_split_string(elts, opt->value, NULL,
                           SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 2);
    if (smartlist_len(elts) < 2) {
      log_warn(LD_CONFIG,"MapAddress '%s' has too few arguments. Ignoring.",
               opt->value);
      goto cleanup;
    }

    from = smartlist_get(elts,0);
    to = smartlist_get(elts,1);

    if (to[0] == '.' || from[0] == '.') {
      log_warn(LD_CONFIG,"MapAddress '%s' is ambiguous - address starts with a"
              "'.'. Ignoring.",opt->value);
      goto cleanup;
    }

    if (addressmap_register_auto(from, to, 0, ADDRMAPSRC_TORRC, &msg) < 0) {
      log_warn(LD_CONFIG,"MapAddress '%s' failed: %s. Ignoring.", opt->value,
               msg);
      goto cleanup;
    }

    if (smartlist_len(elts) > 2)
      log_warn(LD_CONFIG,"Ignoring extra arguments to MapAddress.");

  cleanup:
    SMARTLIST_FOREACH(elts, char*, cp, tor_free(cp));
    smartlist_clear(elts);
  }
  smartlist_free(elts);
}

/* XXXX move to connection_edge.c */
int
addressmap_register_auto(const char *from, const char *to,
                         time_t expires,
                         addressmap_entry_source_t addrmap_source,
                         const char **msg)
{
  int from_wildcard = 0, to_wildcard = 0;

  *msg = "whoops, forgot the error message";

  if (!strcmp(to, "*") || !strcmp(from, "*")) {
    *msg = "can't remap from or to *";
    return -1;
  }
  /* Detect asterisks in expressions of type: '*.example.com' */
  if (!strncmp(from,"*.",2)) {
    from += 2;
    from_wildcard = 1;
  }
  if (!strncmp(to,"*.",2)) {
    to += 2;
    to_wildcard = 1;
  }

  if (to_wildcard && !from_wildcard) {
    *msg =  "can only use wildcard (i.e. '*.') if 'from' address "
      "uses wildcard also";
    return -1;
  }

  if (address_is_invalid_destination(to, 1)) {
    *msg = "destination is invalid";
    return -1;
  }

  addressmap_register(from, tor_strdup(to), expires, addrmap_source,
                      from_wildcard, to_wildcard);

  return 0;
}

STATIC int
open_and_add_file_log(const log_severity_list_t *severity,
                      const char *filename, int truncate_log)
{
  int open_flags = O_WRONLY|O_CREAT;
  open_flags |= truncate_log ? O_TRUNC : O_APPEND;

  int fd = tor_open_cloexec(filename, open_flags, 0640);
  if (fd < 0)
    return -1;

  return add_file_log(severity, filename, fd);
}

static int
options_init_logs(const or_options_t *old_options, or_options_t *options,
                  int validate_only)
{
  config_line_t *opt;
  int ok;
  smartlist_t *elts;
  int run_as_daemon =
#ifdef _WIN32
               0;
#else
               options->RunAsDaemon;
#endif

  if (options->LogTimeGranularity <= 0) {
    log_warn(LD_CONFIG, "Log time granularity '%d' has to be positive.",
             options->LogTimeGranularity);
    return -1;
  } else if (1000 % options->LogTimeGranularity != 0 &&
             options->LogTimeGranularity % 1000 != 0) {
    int granularity = options->LogTimeGranularity;
    if (granularity < 40) {
      do granularity++;
      while (1000 % granularity != 0);
    } else if (granularity < 1000) {
      granularity = 1000 / granularity;
      while (1000 % granularity != 0)
        granularity--;
      granularity = 1000 / granularity;
    } else {
      granularity = 1000 * ((granularity / 1000) + 1);
    }
    log_warn(LD_CONFIG, "Log time granularity '%d' has to be either a "
                        "divisor or a multiple of 1 second. Changing to "
                        "'%d'.",
             options->LogTimeGranularity, granularity);
    if (!validate_only)
      set_log_time_granularity(granularity);
  } else {
    if (!validate_only)
      set_log_time_granularity(options->LogTimeGranularity);
  }

  ok = 1;
  elts = smartlist_new();

  for (opt = options->Logs; opt; opt = opt->next) {
    log_severity_list_t *severity;
    const char *cfg = opt->value;
    severity = tor_malloc_zero(sizeof(log_severity_list_t));
    if (parse_log_severity_config(&cfg, severity) < 0) {
      log_warn(LD_CONFIG, "Couldn't parse log levels in Log option 'Log %s'",
               opt->value);
      ok = 0; goto cleanup;
    }

    smartlist_split_string(elts, cfg, NULL,
                           SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 2);

    if (smartlist_len(elts) == 0)
      smartlist_add_strdup(elts, "stdout");

    if (smartlist_len(elts) == 1 &&
        (!strcasecmp(smartlist_get(elts,0), "stdout") ||
         !strcasecmp(smartlist_get(elts,0), "stderr"))) {
      int err = smartlist_len(elts) &&
        !strcasecmp(smartlist_get(elts,0), "stderr");
      if (!validate_only) {
        if (run_as_daemon) {
          log_warn(LD_CONFIG,
                   "Can't log to %s with RunAsDaemon set; skipping stdout",
                   err?"stderr":"stdout");
        } else {
          add_stream_log(severity, err?"<stderr>":"<stdout>",
                         fileno(err?stderr:stdout));
        }
      }
      goto cleanup;
    }
    if (smartlist_len(elts) == 1) {
      if (!strcasecmp(smartlist_get(elts,0), "syslog")) {
#ifdef HAVE_SYSLOG_H
        if (!validate_only) {
          add_syslog_log(severity, options->SyslogIdentityTag);
        }
#else
        log_warn(LD_CONFIG, "Syslog is not supported on this system. Sorry.");
#endif /* defined(HAVE_SYSLOG_H) */
        goto cleanup;
      }

      if (!strcasecmp(smartlist_get(elts, 0), "android")) {
#ifdef HAVE_ANDROID_LOG_H
        if (!validate_only) {
          add_android_log(severity, options->AndroidIdentityTag);
        }
#else
        log_warn(LD_CONFIG, "Android logging is not supported"
                            " on this system. Sorry.");
#endif // HAVE_ANDROID_LOG_H.
        goto cleanup;
      }
    }

    if (smartlist_len(elts) == 2 &&
        !strcasecmp(smartlist_get(elts,0), "file")) {
      if (!validate_only) {
        char *fname = expand_filename(smartlist_get(elts, 1));
        /* Truncate if TruncateLogFile is set and we haven't seen this option
           line before. */
        int truncate_log = 0;
        if (options->TruncateLogFile) {
          truncate_log = 1;
          if (old_options) {
            config_line_t *opt2;
            for (opt2 = old_options->Logs; opt2; opt2 = opt2->next)
              if (!strcmp(opt->value, opt2->value)) {
                truncate_log = 0;
                break;
              }
          }
        }
        if (open_and_add_file_log(severity, fname, truncate_log) < 0) {
          log_warn(LD_CONFIG, "Couldn't open file for 'Log %s': %s",
                   opt->value, strerror(errno));
          ok = 0;
        }
        tor_free(fname);
      }
      goto cleanup;
    }

    log_warn(LD_CONFIG, "Bad syntax on file Log option 'Log %s'",
             opt->value);
    ok = 0; goto cleanup;

  cleanup:
    SMARTLIST_FOREACH(elts, char*, cp, tor_free(cp));
    smartlist_clear(elts);
    tor_free(severity);
  }
  smartlist_free(elts);

  if (ok && !validate_only)
    logs_set_domain_logging(options->LogMessageDomains);

  return ok?0:-1;
}

static int
validate_transport_socks_arguments(const smartlist_t *args)
{
  char *socks_string = NULL;
  size_t socks_string_len;

  tor_assert(args);
  tor_assert(smartlist_len(args) > 0);

  SMARTLIST_FOREACH_BEGIN(args, const char *, s) {
    if (!string_is_key_value(LOG_WARN, s)) { /* items should be k=v items */
      log_warn(LD_CONFIG, "'%s' is not a k=v item.", s);
      return -1;
    }
  } SMARTLIST_FOREACH_END(s);

  socks_string = pt_stringify_socks_args(args);
  if (!socks_string)
    return -1;

  socks_string_len = strlen(socks_string);
  tor_free(socks_string);

  if (socks_string_len > MAX_SOCKS5_AUTH_SIZE_TOTAL) {
    log_warn(LD_CONFIG, "SOCKS arguments can't be more than %u bytes (%lu).",
             MAX_SOCKS5_AUTH_SIZE_TOTAL,
             (unsigned long) socks_string_len);
    return -1;
  }

  return 0;
}

/* private */ void
bridge_line_free_(bridge_line_t *bridge_line)
{
  if (!bridge_line)
    return;

  if (bridge_line->socks_args) {
    SMARTLIST_FOREACH(bridge_line->socks_args, char*, s, tor_free(s));
    smartlist_free(bridge_line->socks_args);
  }
  tor_free(bridge_line->transport_name);
  tor_free(bridge_line);
}

/* private */ bridge_line_t *
parse_bridge_line(const char *line)
{
  smartlist_t *items = NULL;
  char *addrport=NULL, *fingerprint=NULL;
  char *field=NULL;
  bridge_line_t *bridge_line = tor_malloc_zero(sizeof(bridge_line_t));

  items = smartlist_new();
  smartlist_split_string(items, line, NULL,
                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
  if (smartlist_len(items) < 1) {
    log_warn(LD_CONFIG, "Too few arguments to Bridge line.");
    goto err;
  }

  /* first field is either a transport name or addrport */
  field = smartlist_get(items, 0);
  smartlist_del_keeporder(items, 0);

  if (string_is_C_identifier(field)) {
    /* It's a transport name. */
    bridge_line->transport_name = field;
    if (smartlist_len(items) < 1) {
      log_warn(LD_CONFIG, "Too few items to Bridge line.");
      goto err;
    }
    addrport = smartlist_get(items, 0); /* Next field is addrport then. */
    smartlist_del_keeporder(items, 0);
  } else {
    addrport = field;
  }

  if (tor_addr_port_parse(LOG_INFO, addrport,
                          &bridge_line->addr, &bridge_line->port, 443)<0) {
    log_warn(LD_CONFIG, "Error parsing Bridge address '%s'", addrport);
    goto err;
  }

  /* If transports are enabled, next field could be a fingerprint or a
     socks argument. If transports are disabled, next field must be
     a fingerprint. */
  if (smartlist_len(items)) {
    if (bridge_line->transport_name) { /* transports enabled: */
      field = smartlist_get(items, 0);
      smartlist_del_keeporder(items, 0);

      /* If it's a key=value pair, then it's a SOCKS argument for the
         transport proxy... */
      if (string_is_key_value(LOG_DEBUG, field)) {
        bridge_line->socks_args = smartlist_new();
        smartlist_add(bridge_line->socks_args, field);
      } else { /* ...otherwise, it's the bridge fingerprint. */
        fingerprint = field;
      }

    } else { /* transports disabled: */
      fingerprint = smartlist_join_strings(items, "", 0, NULL);
    }
  }

  /* Handle fingerprint, if it was provided. */
  if (fingerprint) {
    if (strlen(fingerprint) != HEX_DIGEST_LEN) {
      log_warn(LD_CONFIG, "Key digest for Bridge is wrong length.");
      goto err;
    }
    if (base16_decode(bridge_line->digest, DIGEST_LEN,
                      fingerprint, HEX_DIGEST_LEN) != DIGEST_LEN) {
      log_warn(LD_CONFIG, "Unable to decode Bridge key digest.");
      goto err;
    }
  }

  /* If we are using transports, any remaining items in the smartlist
     should be k=v values. */
  if (bridge_line->transport_name && smartlist_len(items)) {
    if (!bridge_line->socks_args)
      bridge_line->socks_args = smartlist_new();

    /* append remaining items of 'items' to 'socks_args' */
    smartlist_add_all(bridge_line->socks_args, items);
    smartlist_clear(items);

    tor_assert(smartlist_len(bridge_line->socks_args) > 0);
  }

  if (bridge_line->socks_args) {
    if (validate_transport_socks_arguments(bridge_line->socks_args) < 0)
      goto err;
  }

  goto done;

 err:
  bridge_line_free(bridge_line);
  bridge_line = NULL;

 done:
  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
  smartlist_free(items);
  tor_free(addrport);
  tor_free(fingerprint);

  return bridge_line;
}

STATIC int
parse_transport_line(const or_options_t *options,
                     const char *line, int validate_only,
                     int server)
{

  smartlist_t *items = NULL;
  int r;
  const char *transports = NULL;
  smartlist_t *transport_list = NULL;
  char *type = NULL;
  char *addrport = NULL;
  tor_addr_t addr;
  uint16_t port = 0;
  int socks_ver = PROXY_NONE;

  /* managed proxy options */
  int is_managed = 0;
  char **proxy_argv = NULL;
  char **tmp = NULL;
  int proxy_argc, i;
  int is_useless_proxy = 1;

  int line_length;

  /* Split the line into space-separated tokens */
  items = smartlist_new();
  smartlist_split_string(items, line, NULL,
                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
  line_length = smartlist_len(items);

  if (line_length < 3) {
    log_warn(LD_CONFIG,
             "Too few arguments on %sTransportPlugin line.",
             server ? "Server" : "Client");
    goto err;
  }

  /* Get the first line element, split it to commas into
     transport_list (in case it's multiple transports) and validate
     the transport names. */
  transports = smartlist_get(items, 0);
  transport_list = smartlist_new();
  smartlist_split_string(transport_list, transports, ",",
                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
  SMARTLIST_FOREACH_BEGIN(transport_list, const char *, transport_name) {
    /* validate transport names */
    if (!string_is_C_identifier(transport_name)) {
      log_warn(LD_CONFIG, "Transport name is not a C identifier (%s).",
               transport_name);
      goto err;
    }

    /* see if we actually need the transports provided by this proxy */
    if (!validate_only && transport_is_needed(transport_name))
      is_useless_proxy = 0;
  } SMARTLIST_FOREACH_END(transport_name);

  type = smartlist_get(items, 1);
  if (!strcmp(type, "exec")) {
    is_managed = 1;
  } else if (server && !strcmp(type, "proxy")) {
    /* 'proxy' syntax only with ServerTransportPlugin */
    is_managed = 0;
  } else if (!server && !strcmp(type, "socks4")) {
    /* 'socks4' syntax only with ClientTransportPlugin */
    is_managed = 0;
    socks_ver = PROXY_SOCKS4;
  } else if (!server && !strcmp(type, "socks5")) {
    /* 'socks5' syntax only with ClientTransportPlugin */
    is_managed = 0;
    socks_ver = PROXY_SOCKS5;
  } else {
    log_warn(LD_CONFIG,
             "Strange %sTransportPlugin type '%s'",
             server ? "Server" : "Client", type);
    goto err;
  }

  if (is_managed && options->Sandbox) {
    log_warn(LD_CONFIG,
             "Managed proxies are not compatible with Sandbox mode."
             "(%sTransportPlugin line was %s)",
             server ? "Server" : "Client", escaped(line));
    goto err;
  }

  if (is_managed && options->NoExec) {
    log_warn(LD_CONFIG,
             "Managed proxies are not compatible with NoExec mode; ignoring."
             "(%sTransportPlugin line was %s)",
             server ? "Server" : "Client", escaped(line));
    r = 0;
    goto done;
  }

  if (is_managed) {
    /* managed */

    if (!server && !validate_only && is_useless_proxy) {
      log_info(LD_GENERAL,
               "Pluggable transport proxy (%s) does not provide "
               "any needed transports and will not be launched.",
               line);
    }

    /*
     * If we are not just validating, use the rest of the line as the
     * argv of the proxy to be launched. Also, make sure that we are
     * only launching proxies that contribute useful transports.
     */

    if (!validate_only && (server || !is_useless_proxy)) {
      proxy_argc = line_length - 2;
      tor_assert(proxy_argc > 0);
      proxy_argv = tor_calloc((proxy_argc + 1), sizeof(char *));
      tmp = proxy_argv;

      for (i = 0; i < proxy_argc; i++) {
        /* store arguments */
        *tmp++ = smartlist_get(items, 2);
        smartlist_del_keeporder(items, 2);
      }
      *tmp = NULL; /* terminated with NULL, just like execve() likes it */

      /* kickstart the thing */
      if (server) {
        pt_kickstart_server_proxy(transport_list, proxy_argv);
      } else {
        pt_kickstart_client_proxy(transport_list, proxy_argv);
      }
    }
  } else {
    /* external */

    /* ClientTransportPlugins connecting through a proxy is managed only. */
    if (!server && (options->Socks4Proxy || options->Socks5Proxy ||
                    options->HTTPSProxy)) {
      log_warn(LD_CONFIG, "You have configured an external proxy with another "
                          "proxy type. (Socks4Proxy|Socks5Proxy|HTTPSProxy)");
      goto err;
    }

    if (smartlist_len(transport_list) != 1) {
      log_warn(LD_CONFIG,
               "You can't have an external proxy with more than "
               "one transport.");
      goto err;
    }

    addrport = smartlist_get(items, 2);

    if (tor_addr_port_lookup(addrport, &addr, &port) < 0) {
      log_warn(LD_CONFIG,
               "Error parsing transport address '%s'", addrport);
      goto err;
    }

    if (!port) {
      log_warn(LD_CONFIG,
               "Transport address '%s' has no port.", addrport);
      goto err;
    }

    if (!validate_only) {
      log_info(LD_DIR, "%s '%s' at %s.",
               server ? "Server transport" : "Transport",
               transports, fmt_addrport(&addr, port));

      if (!server) {
        transport_add_from_config(&addr, port,
                                  smartlist_get(transport_list, 0),
                                  socks_ver);
      }
    }
  }

  r = 0;
  goto done;

 err:
  r = -1;

 done:
  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
  smartlist_free(items);
  if (transport_list) {
    SMARTLIST_FOREACH(transport_list, char*, s, tor_free(s));
    smartlist_free(transport_list);
  }

  return r;
}

static char *
get_bindaddr_from_transport_listen_line(const char *line,const char *transport)
{
  smartlist_t *items = NULL;
  const char *parsed_transport = NULL;
  char *addrport = NULL;
  tor_addr_t addr;
  uint16_t port = 0;

  items = smartlist_new();
  smartlist_split_string(items, line, NULL,
                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);

  if (smartlist_len(items) < 2) {
    log_warn(LD_CONFIG,"Too few arguments on ServerTransportListenAddr line.");
    goto err;
  }

  parsed_transport = smartlist_get(items, 0);
  addrport = tor_strdup(smartlist_get(items, 1));

  /* If 'transport' is given, check if it matches the one on the line */
  if (transport && strcmp(transport, parsed_transport))
    goto err;

  /* Validate addrport */
  if (tor_addr_port_parse(LOG_WARN, addrport, &addr, &port, -1)<0) {
    log_warn(LD_CONFIG, "Error parsing ServerTransportListenAddr "
             "address '%s'", addrport);
    goto err;
  }

  goto done;

 err:
  tor_free(addrport);
  addrport = NULL;

 done:
  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
  smartlist_free(items);

  return addrport;
}

smartlist_t *
get_options_from_transport_options_line(const char *line,const char *transport)
{
  smartlist_t *items = smartlist_new();
  smartlist_t *options = smartlist_new();
  const char *parsed_transport = NULL;

  smartlist_split_string(items, line, NULL,
                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);

  if (smartlist_len(items) < 2) {
    log_warn(LD_CONFIG,"Too few arguments on ServerTransportOptions line.");
    goto err;
  }

  parsed_transport = smartlist_get(items, 0);
  /* If 'transport' is given, check if it matches the one on the line */
  if (transport && strcmp(transport, parsed_transport))
    goto err;

  SMARTLIST_FOREACH_BEGIN(items, const char *, option) {
    if (option_sl_idx == 0) /* skip the transport field (first field)*/
      continue;

    /* validate that it's a k=v value */
    if (!string_is_key_value(LOG_WARN, option)) {
      log_warn(LD_CONFIG, "%s is not a k=v value.", escaped(option));
      goto err;
    }

    /* add it to the options smartlist */
    smartlist_add_strdup(options, option);
    log_debug(LD_CONFIG, "Added %s to the list of options", escaped(option));
  } SMARTLIST_FOREACH_END(option);

  goto done;

 err:
  SMARTLIST_FOREACH(options, char*, s, tor_free(s));
  smartlist_free(options);
  options = NULL;

 done:
  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
  smartlist_free(items);

  return options;
}

char *
get_transport_bindaddr_from_config(const char *transport)
{
  config_line_t *cl;
  const or_options_t *options = get_options();

  for (cl = options->ServerTransportListenAddr; cl; cl = cl->next) {
    char *bindaddr =
      get_bindaddr_from_transport_listen_line(cl->value, transport);
    if (bindaddr)
      return bindaddr;
  }

  return NULL;
}

smartlist_t *
get_options_for_server_transport(const char *transport)
{
  config_line_t *cl;
  const or_options_t *options = get_options();

  for (cl = options->ServerTransportOptions; cl; cl = cl->next) {
    smartlist_t *options_sl =
      get_options_from_transport_options_line(cl->value, transport);
    if (options_sl)
      return options_sl;
  }

  return NULL;
}

STATIC int
parse_dir_authority_line(const char *line, dirinfo_type_t required_type,
                         int validate_only)
{
  smartlist_t *items = NULL;
  int r;
  char *addrport=NULL, *address=NULL, *nickname=NULL, *fingerprint=NULL;
  tor_addr_port_t ipv6_addrport, *ipv6_addrport_ptr = NULL;
  uint16_t dir_port = 0, or_port = 0;
  char digest[DIGEST_LEN];
  char v3_digest[DIGEST_LEN];
  dirinfo_type_t type = 0;
  double weight = 1.0;

  memset(v3_digest, 0, sizeof(v3_digest));

  items = smartlist_new();
  smartlist_split_string(items, line, NULL,
                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
  if (smartlist_len(items) < 1) {
    log_warn(LD_CONFIG, "No arguments on DirAuthority line.");
    goto err;
  }

  if (is_legal_nickname(smartlist_get(items, 0))) {
    nickname = smartlist_get(items, 0);
    smartlist_del_keeporder(items, 0);
  }

  while (smartlist_len(items)) {
    char *flag = smartlist_get(items, 0);
    if (TOR_ISDIGIT(flag[0]))
      break;
    if (!strcasecmp(flag, "hs") ||
               !strcasecmp(flag, "no-hs")) {
      log_warn(LD_CONFIG, "The DirAuthority options 'hs' and 'no-hs' are "
               "obsolete; you don't need them any more.");
    } else if (!strcasecmp(flag, "bridge")) {
      type |= BRIDGE_DIRINFO;
    } else if (!strcasecmp(flag, "no-v2")) {
      /* obsolete, but may still be contained in DirAuthority lines generated
         by various tools */;
    } else if (!strcasecmpstart(flag, "orport=")) {
      int ok;
      char *portstring = flag + strlen("orport=");
      or_port = (uint16_t) tor_parse_long(portstring, 10, 1, 65535, &ok, NULL);
      if (!ok)
        log_warn(LD_CONFIG, "Invalid orport '%s' on DirAuthority line.",
                 portstring);
    } else if (!strcmpstart(flag, "weight=")) {
      int ok;
      const char *wstring = flag + strlen("weight=");
      weight = tor_parse_double(wstring, 0, (double)UINT64_MAX, &ok, NULL);
      if (!ok) {
        log_warn(LD_CONFIG, "Invalid weight '%s' on DirAuthority line.",flag);
        weight=1.0;
      }
    } else if (!strcasecmpstart(flag, "v3ident=")) {
      char *idstr = flag + strlen("v3ident=");
      if (strlen(idstr) != HEX_DIGEST_LEN ||
          base16_decode(v3_digest, DIGEST_LEN,
                        idstr, HEX_DIGEST_LEN) != DIGEST_LEN) {
        log_warn(LD_CONFIG, "Bad v3 identity digest '%s' on DirAuthority line",
                 flag);
      } else {
        type |= V3_DIRINFO|EXTRAINFO_DIRINFO|MICRODESC_DIRINFO;
      }
    } else if (!strcasecmpstart(flag, "ipv6=")) {
      if (ipv6_addrport_ptr) {
        log_warn(LD_CONFIG, "Redundant ipv6 addr/port on DirAuthority line");
      } else {
        if (tor_addr_port_parse(LOG_WARN, flag+strlen("ipv6="),
                                &ipv6_addr