stun/stun5389.c

   1 /*
   2  * This file is part of the Nice GLib ICE library.
   3  *
   4  * (C) 2007 Nokia Corporation. All rights reserved.
   5  *  Contact: Rémi Denis-Courmont
   6  * COPYRIGHT (C) 1986 Gary S. Brown
   7  *  See documentation of the function crc32() below.
   8  *
   9  * The contents of this file are subject to the Mozilla Public License Version
  10  * 1.1 (the "License"); you may not use this file except in compliance with
  11  * the License. You may obtain a copy of the License at
  12  * http://www.mozilla.org/MPL/
  13  *
  14  * Software distributed under the License is distributed on an "AS IS" basis,
  15  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  16  * for the specific language governing rights and limitations under the
  17  * License.
  18  *
  19  * The Original Code is the Nice GLib ICE library.
  20  *
  21  * The Initial Developers of the Original Code are Collabora Ltd and Nokia
  22  * Corporation. All Rights Reserved.
  23  *
  24  * Contributors:
  25  *   Rémi Denis-Courmont, Nokia
  26  *
  27  * Alternatively, the contents of this file may be used under the terms of the
  28  * the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
  29  * case the provisions of LGPL are applicable instead of those above. If you
  30  * wish to allow use of your version of this file only under the terms of the
  31  * LGPL and not to allow others to use your version of this file under the
  32  * MPL, indicate your decision by deleting the provisions above and replace
  33  * them with the notice and other provisions required by the LGPL. If you do
  34  * not delete the provisions above, a recipient may use your version of this
  35  * file under either the MPL or the LGPL.
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 # include <config.h>
  40 #endif
  41
  42 #ifdef _WIN32
  43 #include <winsock2.h>
  44 #else
  45 #include <sys/socket.h>
  46 #include <netinet/in.h> /* htons() */
  47 #endif
  48
  49 #include <string.h>
  50 #include <stdlib.h>
  51
  52 #include "stuncrc32.h"
  53 #include "stunmessage.h"
  54
  55 uint32_t stun_fingerprint (const uint8_t *msg, size_t len)
  56 {
  57   crc_data data[3];
  58   uint16_t fakelen = htons (len - 20u);
  59
  60   // assert (len >= 28u);
  61
  62   data[0].buf = (void *)msg;
  63   data[0].len = 2;
  64   data[1].buf = (uint8_t *)&fakelen;
  65   data[1].len = 2;
  66   data[2].buf = (void *)(msg + 4);
  67   /* first 4 bytes done, last 8 bytes not summed */
  68   data[2].len = len - 12u;
  69
  70   return htonl (crc32 (data, 3) ^ 0x5354554e);
  71 }
  72
  73 bool stun_has_cookie (const StunMessage *msg)
  74 {
  75   StunTransactionId id;
  76   uint32_t cookie = htonl (STUN_MAGIC_COOKIE);
  77   stun_message_id (msg, id);
  78   return memcmp (id, &cookie, sizeof (cookie)) == 0;
  79 }
  80
  81
  82 StunMessageReturn stun_message_append_software (StunMessage *msg)
  83 {
  84   static const char software[] = PACKAGE_STRING;
  85   // assert (strlen (software) < 128);
  86
  87   return stun_message_append_string (msg, STUN_ATTRIBUTE_SOFTWARE, software);
  88 }