stun5389.c 3.5 KB
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/*
 * This file is part of the Nice GLib ICE library.
 *
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 * (C) 2008-2009 Collabora Ltd.
 *  Contact: Youness Alaoui
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 * (C) 2007 Nokia Corporation. All rights reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Nice GLib ICE library.
 *
 * The Initial Developers of the Original Code are Collabora Ltd and Nokia
 * Corporation. All Rights Reserved.
 *
 * Contributors:
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 *   Youness Alaoui, Collabora Ltd.
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 *
 * Alternatively, the contents of this file may be used under the terms of the
 * the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
 * case the provisions of LGPL are applicable instead of those above. If you
 * wish to allow use of your version of this file only under the terms of the
 * LGPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replace
 * them with the notice and other provisions required by the LGPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the LGPL.
 */

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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

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#ifdef _WIN32
#include <winsock2.h>
#else
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#include <sys/socket.h>
#include <netinet/in.h> /* htons() */
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#endif

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#include <string.h>
#include <stdlib.h>
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#include "stun5389.h"
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#include "stuncrc32.h"
#include "stunmessage.h"
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static const char utf8_skip_data[256] = {
  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,
  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,
  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,
  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,
  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,
  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,
  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,
  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
};

#define next_utf8_char(p) (char *)((p) + \
      utf8_skip_data[*(const unsigned char *)(p)])

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uint32_t stun_fingerprint (const uint8_t *msg, size_t len,
    bool wlm2009_stupid_crc32_typo)
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{
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  crc_data data[3];
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  uint16_t fakelen = htons (len - 20u);

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  // assert (len >= 28u);
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  data[0].buf = (void *)msg;
  data[0].len = 2;
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  data[1].buf = (uint8_t *)&fakelen;
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  data[1].len = 2;
  data[2].buf = (void *)(msg + 4);
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  /* first 4 bytes done, last 8 bytes not summed */
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  data[2].len = len - 12u;
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  return htonl (stun_crc32 (data, 3, wlm2009_stupid_crc32_typo) ^ 0x5354554e);
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}

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bool stun_message_has_cookie (const StunMessage *msg)
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{
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  StunTransactionId id;
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  uint32_t cookie = htonl (STUN_MAGIC_COOKIE);
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  stun_message_id (msg, id);
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  return memcmp (id, &cookie, sizeof (cookie)) == 0;
}


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StunMessageReturn stun_message_append_software (StunMessage *msg,
    const char *software)
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{
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  int len = 0;
  const char *ptr = NULL;

  if (software == NULL)
    software = PACKAGE_STRING;

  ptr = software;
  while (*ptr && len < 128) {
    ptr = next_utf8_char (ptr);
    len++;
  }
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  return stun_message_append_bytes (msg, STUN_ATTRIBUTE_SOFTWARE, software,
      ptr - software);
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}