stun/stun5389.c

   1 /*
   2  * This file is part of the Nice GLib ICE library.
   3  *
   4  * (C) 2008-2009 Collabora Ltd.
   5  *  Contact: Youness Alaoui
   6  * (C) 2007 Nokia Corporation. All rights reserved.
   7  *
   8  * The contents of this file are subject to the Mozilla Public License Version
   9  * 1.1 (the "License"); you may not use this file except in compliance with
  10  * the License. You may obtain a copy of the License at
  11  * http://www.mozilla.org/MPL/
  12  *
  13  * Software distributed under the License is distributed on an "AS IS" basis,
  14  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  15  * for the specific language governing rights and limitations under the
  16  * License.
  17  *
  18  * The Original Code is the Nice GLib ICE library.
  19  *
  20  * The Initial Developers of the Original Code are Collabora Ltd and Nokia
  21  * Corporation. All Rights Reserved.
  22  *
  23  * Contributors:
  24  *   Youness Alaoui, Collabora Ltd.
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of the
  27  * the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
  28  * case the provisions of LGPL are applicable instead of those above. If you
  29  * wish to allow use of your version of this file only under the terms of the
  30  * LGPL and not to allow others to use your version of this file under the
  31  * MPL, indicate your decision by deleting the provisions above and replace
  32  * them with the notice and other provisions required by the LGPL. If you do
  33  * not delete the provisions above, a recipient may use your version of this
  34  * file under either the MPL or the LGPL.
  35  */
  36
  37 #ifdef HAVE_CONFIG_H
  38 # include <config.h>
  39 #endif
  40
  41 #ifdef _WIN32
  42 #include <winsock2.h>
  43 #else
  44 #include <sys/socket.h>
  45 #include <netinet/in.h> /* htons() */
  46 #endif
  47
  48 #include <string.h>
  49 #include <stdlib.h>
  50
  51 #include "stun5389.h"
  52 #include "stuncrc32.h"
  53 #include "stunmessage.h"
  54
  55
  56 static const char utf8_skip_data[256] = {
  57   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  58   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  59   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  60   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  61   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  62   1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  63   2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
  64   3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1
  65 };
  66
  67 #define next_utf8_char(p) (char *)((p) + \
  68       utf8_skip_data[*(const unsigned char *)(p)])
  69
  70 uint32_t stun_fingerprint (const uint8_t *msg, size_t len,
  71     bool wlm2009_stupid_crc32_typo)
  72 {
  73   crc_data data[3];
  74   uint16_t fakelen = htons (len - 20u);
  75
  76   // assert (len >= 28u);
  77
  78   data[0].buf = (void *)msg;
  79   data[0].len = 2;
  80   data[1].buf = (uint8_t *)&fakelen;
  81   data[1].len = 2;
  82   data[2].buf = (void *)(msg + 4);
  83   /* first 4 bytes done, last 8 bytes not summed */
  84   data[2].len = len - 12u;
  85
  86   return htonl (stun_crc32 (data, 3, wlm2009_stupid_crc32_typo) ^ 0x5354554e);
  87 }
  88
  89 bool stun_message_has_cookie (const StunMessage *msg)
  90 {
  91   StunTransactionId id;
  92   uint32_t cookie = htonl (STUN_MAGIC_COOKIE);
  93   stun_message_id (msg, id);
  94   return memcmp (id, &cookie, sizeof (cookie)) == 0;
  95 }
  96
  97
  98 StunMessageReturn stun_message_append_software (StunMessage *msg,
  99     const char *software)
 100 {
 101   int len = 0;
 102   const char *ptr = NULL;
 103
 104   if (software == NULL)
 105     software = PACKAGE_STRING;
 106
 107   ptr = software;
 108   while (*ptr && len < 128) {
 109     ptr = next_utf8_char (ptr);
 110     len++;
 111   }
 112
 113   return stun_message_append_bytes (msg, STUN_ATTRIBUTE_SOFTWARE, software,
 114       ptr - software);
 115 }