Line data    Source code

       1             : /* Copyright (c) 2003, Roger Dingledine
       2             :  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
       3             :  * Copyright (c) 2007-2021, The Tor Project, Inc. */
       4             : /* See LICENSE for licensing information */
       5             : 
       6             : /**
       7             :  * \file keyval.c
       8             :  *
       9             :  * \brief Handle data encoded as a key=value pair.
      10             :  **/
      11             : 
      12             : #include "orconfig.h"
      13             : #include "lib/encoding/keyval.h"
      14             : #include "lib/log/escape.h"
      15             : #include "lib/log/log.h"
      16             : #include "lib/log/util_bug.h"
      17             : 
      18             : #include <stdlib.h>
      19             : #include <string.h>
      20             : 
      21             : /** Return true if <b>string</b> is a valid 'key=[value]' string.
      22             :  *  "value" is optional, to indicate the empty string. Log at logging
      23             :  *  <b>severity</b> if something ugly happens. */
      24             : int
      25         329 : string_is_key_value(int severity, const char *string)
      26             : {
      27             :   /* position of equal sign in string */
      28         329 :   const char *equal_sign_pos = NULL;
      29             : 
      30         329 :   tor_assert(string);
      31             : 
      32         329 :   if (strlen(string) < 2) { /* "x=" is shortest args string */
      33           1 :     tor_log(severity, LD_GENERAL, "'%s' is too short to be a k=v value.",
      34             :             escaped(string));
      35           1 :     return 0;
      36             :   }
      37             : 
      38         328 :   equal_sign_pos = strchr(string, '=');
      39         328 :   if (!equal_sign_pos) {
      40          56 :     tor_log(severity, LD_GENERAL, "'%s' is not a k=v value.", escaped(string));
      41          56 :     return 0;
      42             :   }
      43             : 
      44             :   /* validate that the '=' is not in the beginning of the string. */
      45         272 :   if (equal_sign_pos == string) {
      46           2 :     tor_log(severity, LD_GENERAL, "'%s' is not a valid k=v value.",
      47             :             escaped(string));
      48           2 :     return 0;
      49             :   }
      50             : 
      51             :   return 1;
      52             : }