osip_message_parse.c

libosip2-3.0.3最新版本

/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Aymeric MOIZARD [e-mail]
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <stdio.h>
#include <stdlib.h>

#include <osipparser2/osip_port.h>
#include <osipparser2/osip_parser.h>
#include "parser.h"

static void osip_util_replace_all_lws (char *sip_message);
static int osip_message_set__header (osip_message_t * sip, const char *hname,
                                     const char *hvalue);
static int msg_headers_parse (osip_message_t * sip,
                              const char *start_of_header, const char **body);
static int msg_osip_body_parse (osip_message_t * sip,
                                const char *start_of_buf,
                                const char **next_body, size_t length);


static int
__osip_message_startline_parsereq (osip_message_t * dest, const char *buf,
                                   const char **headers)
{
  const char *p1;
  const char *p2;
  char *requesturi;
  int i;

  dest->sip_method = NULL;
  dest->status_code = 0;
  dest->reason_phrase = NULL;

  *headers = buf;

  /* The first token is the method name: */
  p2 = strchr (buf, ' ');
  if (p2 == NULL)
    return -1;
  if (*(p2 + 1) == '\0' || *(p2 + 2) == '\0')
    return -1;
  if (p2 - buf == 0)
    {
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_ERROR, NULL,
                   "No space allowed here\n"));
      return -1;
    }
  dest->sip_method = (char *) osip_malloc (p2 - buf + 1);
  osip_strncpy (dest->sip_method, buf, p2 - buf);

  /* The second token is a sip-url or a uri: */
  p1 = strchr (p2 + 2, ' ');    /* no space allowed inside sip-url */
  if (p1 == NULL)
    {
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_ERROR, NULL,
                   "Uncompliant request-uri\n"));
      osip_free (dest->sip_method);
      dest->sip_method = NULL;
      return -1;
    }
  if (p1 - p2 < 2)
    {
      osip_free (dest->sip_method);
      dest->sip_method = NULL;
      return -1;
    }

  requesturi = (char *) osip_malloc (p1 - p2);
  osip_clrncpy (requesturi, p2 + 1, (p1 - p2 - 1));

  osip_uri_init (&(dest->req_uri));
  i = osip_uri_parse (dest->req_uri, requesturi);
  osip_free (requesturi);
  if (i != 0)
    {
      osip_free (dest->sip_method);
      dest->sip_method = NULL;
      osip_uri_free (dest->req_uri);
      dest->req_uri = NULL;
      return -1;
    }

  /* find the the version and the beginning of headers */
  {
    const char *hp = p1;

    while ((*hp != '\r') && (*hp != '\n'))
      {
        if (*hp)
          hp++;
        else
          {
            OSIP_TRACE (osip_trace
                        (__FILE__, __LINE__, OSIP_ERROR, NULL, "No crlf found\n"));
            osip_free (dest->sip_method);
            dest->sip_method = NULL;
            osip_uri_free (dest->req_uri);
            dest->req_uri = NULL;
            return -1;
          }
      }
    if (hp - p1 < 2)
      {
        osip_free (dest->sip_method);
        dest->sip_method = NULL;
        osip_uri_free (dest->req_uri);
        dest->req_uri = NULL;
        return -1;
      }

    dest->sip_version = (char *) osip_malloc (hp - p1);
    osip_strncpy (dest->sip_version, p1 + 1, (hp - p1 - 1));

    if (0 != osip_strcasecmp (dest->sip_version, "SIP/2.0"))
      {
        OSIP_TRACE (osip_trace
                    (__FILE__, __LINE__, OSIP_ERROR, NULL,
                     "Wrong version number\n"));
      }

    hp++;
    if ((*hp) && ('\r' == hp[-1]) && ('\n' == hp[0]))
      hp++;
    (*headers) = hp;
  }
  return 0;
}

static int
__osip_message_startline_parseresp (osip_message_t * dest, const char *buf,
                                    const char **headers)
{
  const char *statuscode;
  const char *reasonphrase;

  dest->req_uri = NULL;
  dest->sip_method = NULL;

  *headers = buf;

  statuscode = strchr (buf, ' ');       /* search for first SPACE */
  if (statuscode == NULL)
    return -1;
  dest->sip_version = (char *) osip_malloc (statuscode - (*headers) + 1);
  osip_strncpy (dest->sip_version, *headers, statuscode - (*headers));

  reasonphrase = strchr (statuscode + 1, ' ');
  if (reasonphrase == NULL)
    {
      osip_free (dest->sip_version);
      dest->sip_version = NULL;
      return -1;
    }
  /* dest->status_code = (char *) osip_malloc (reasonphrase - statuscode); */
  /* osip_strncpy (dest->status_code, statuscode + 1, reasonphrase - statuscode - 1); */
  if (sscanf (statuscode + 1, "%d", &dest->status_code) != 1)
    {
      /* Non-numeric status code */
      return -1;
    }

  if (dest->status_code == 0)
    return -1;

  {
    const char *hp = reasonphrase;

    while ((*hp != '\r') && (*hp != '\n'))
      {
        if (*hp)
          hp++;
        else
          {
            OSIP_TRACE (osip_trace
                        (__FILE__, __LINE__, OSIP_ERROR, NULL, "No crlf found\n"));
            return -1;
          }
      }
    dest->reason_phrase = (char *) osip_malloc (hp - reasonphrase);
    osip_strncpy (dest->reason_phrase, reasonphrase + 1, hp - reasonphrase - 1);

    hp++;
    if ((*hp) && ('\r' == hp[-1]) && ('\n' == hp[0]))
      hp++;
    (*headers) = hp;
  }
  return 0;
}

static int
__osip_message_startline_parse (osip_message_t * dest, const char *buf,
                                const char **headers)
{

  if (0 == strncmp ((const char *) buf, (const char *) "SIP/", 4))
    return __osip_message_startline_parseresp (dest, buf, headers);
  else
    return __osip_message_startline_parsereq (dest, buf, headers);
}

int
__osip_find_next_occurence (const char *str, const char *buf,
                            const char **index_of_str, const char *end_of_buf)
{
  int i;

  *index_of_str = NULL;         /* AMD fix */
  if ((NULL == str) || (NULL == buf))
    return -1;
  /* TODO? we may prefer strcasestr instead of strstr? */
  for (i = 0; i < 1000; i++)
    {
      *index_of_str = strstr (buf, str);
      if (NULL == (*index_of_str))
        {
          /* if '\0' (when binary data is used) is located before the separator,
             then we have to continue searching */
          const char *ptr = buf + strlen (buf);

          if (end_of_buf - ptr > 0)
            {
              buf = ptr + 1;
              continue;
            }
          return -1;
        }
      return 0;
    }
  OSIP_TRACE (osip_trace
              (__FILE__, __LINE__, OSIP_BUG, NULL,
               "This was probably an infinite loop?\n"));
  return -1;
}

/* This method replace all LWS with SP located before the
   initial CRLFCRLF found or the end of the string.
*/
static void
osip_util_replace_all_lws (char *sip_message)
{
  /* const char *end_of_message; */
  char *tmp;

  if (sip_message == NULL)
    return;

  /* end_of_message = sip_message + strlen (sip_message); */

  tmp = sip_message;
  for (; tmp[0] != '\0'; tmp++)
    {
      if (('\0' == tmp[0])
          || ('\0' == tmp[1]) || ('\0' == tmp[2]) || ('\0' == tmp[3]))
        return;

      if ((('\r' == tmp[0]) && ('\n' == tmp[1])
           && ('\r' == tmp[2]) && ('\n' == tmp[3]))
          ||
          (('\r' == tmp[0]) && ('\r' == tmp[1]))
          || (('\n' == tmp[0]) && ('\n' == tmp[1])))
        return;                 /* end of message */

      if ((('\r' == tmp[0]) && ('\n' == tmp[1])
           && ((' ' == tmp[2]) || ('\t' == tmp[2])))
          ||
          (('\r' == tmp[0])
           && ((' ' == tmp[1]) || ('\t' == tmp[1])))
          || (('\n' == tmp[0]) && ((' ' == tmp[1]) || ('\t' == tmp[1]))))
        {
          /* replace line end and TAB symbols by SP */
          tmp[0] = ' ';
          tmp[1] = ' ';
          tmp = tmp + 2;
          /* replace all following TAB symbols */
          for (; ('\t' == tmp[0] || ' ' == tmp[0]);)
            {
              tmp[0] = ' ';
              tmp++;
            }
        }
    }
}

int
__osip_find_next_crlf (const char *start_of_header, const char **end_of_header)
{
  const char *soh = start_of_header;

  *end_of_header = NULL;        /* AMD fix */

  while (('\r' != *soh) && ('\n' != *soh))
    {
      if (*soh)
        soh++;
      else
        {
          OSIP_TRACE (osip_trace
                      (__FILE__, __LINE__, OSIP_ERROR, NULL,
                       "Final CRLF is missing\n"));
          return -1;
        }
    }

  if (('\r' == soh[0]) && ('\n' == soh[1]))
    /* case 1: CRLF is the separator
       case 2 or 3: CR or LF is the separator */
    soh = soh + 1;


  /* VERIFY if TMP is the end of header or LWS.            */
  /* LWS are extra SP, HT, CR and LF contained in headers. */
  if ((' ' == soh[1]) || ('\t' == soh[1]))
    {
      /* From now on, incoming message that potentially
         contains LWS must be processed with
         -> void osip_util_replace_all_lws(char *)
         This is because the parser methods does not
         support detection of LWS inside. */
      OSIP_TRACE (osip_trace
                  (__FILE__, __LINE__, OSIP_BUG, NULL,
                   "Message that contains LWS must be processed with osip_util_replace_all_lws(char *tmp) before being parsed.\n"));
      return -1;
    }

  *end_of_header = soh + 1;
  return 0;
}

int
__osip_find_next_crlfcrlf (const char *start_of_part, const char **end_of_part)
{
  const char *start_of_line;
  const char *end_of_line;
  int i;

  start_of_line = start_of_part;

  for (;;)
    {
      i = __osip_find_next_crlf (start_of_line, &end_of_line);
      if (i == -1)
        {                       /* error case??? no end of mesage found */
          OSIP_TRACE (osip_trace
                      (__FILE__, __LINE__, OSIP_ERROR, NULL,
                       "Final CRLF is missing\n"));
          return -1;
        }
      if ('\0' == end_of_line[0])
        {                       /* error case??? no end of message found */
          OSIP_TRACE (osip_trace
                      (__FILE__, __LINE__, OSIP_ERROR, NULL,
                       "Final CRLF is missing\n"));
          return -1;
      } else if ('\r' == end_of_line[0])
        {
          if ('\n' == end_of_line[1])
            end_of_line++;