dns_structs.h

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/* Copyright (c) 2003-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#ifndef TOR_DNS_STRUCTS_H
#define TOR_DNS_STRUCTS_H

#define MAX_ADDRESSLEN 256

typedef struct pending_connection_t {
  edge_connection_t *conn;
  struct pending_connection_t *next;
} pending_connection_t;

#define CACHED_RESOLVE_MAGIC 0x1234F00D

/* Possible states for a cached resolve_t */
#define CACHE_STATE_PENDING 0

#define CACHE_STATE_DONE 1

#define CACHE_STATE_CACHED 2

#define RES_STATUS_INFLIGHT 1

#define RES_STATUS_DONE_OK 2

#define RES_STATUS_DONE_ERR 3

typedef struct cached_resolve_t {
  HT_ENTRY(cached_resolve_t) node;
  uint32_t magic;  
  char address[MAX_ADDRESSLEN]; 
  union {
    uint32_t addr_ipv4; 
    int err_ipv4; 
  } result_ipv4; 
  union {
    struct in6_addr addr_ipv6; 
    int err_ipv6; 
  } result_ipv6; 
  union {
    char *hostname; 
    int err_hostname; 
  } result_ptr;
  unsigned int res_status_ipv4 : 2;
  unsigned int res_status_ipv6 : 2;
  unsigned int res_status_hostname : 2;
  uint8_t state; 
  time_t expire; 
  uint32_t ttl_ipv4; 
  uint32_t ttl_ipv6; 
  uint32_t ttl_hostname; 
  pending_connection_t *pending_connections;
  int minheap_idx;
} cached_resolve_t;

#endif /* !defined(TOR_DNS_STRUCTS_H) */