osip_message_parse.c

SIP协议栈实现

/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001,2002,2003  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 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;

  /* The first token is the method name: */
  p2 = strchr (buf, ' ');
  if (p2 == NULL)
    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 - p2 < 2)
    return -1;
  requesturi = (char *) osip_malloc (p1 - p2);
  osip_strncpy (requesturi, p2 + 1, (p1 - p2 - 1));
  osip_clrspace (requesturi);

  osip_uri_init (&(dest->req_uri));
  i = osip_uri_parse (dest->req_uri, requesturi);
  osip_free (requesturi);
  if (i == -1)
    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"));
	    return -1;
	  }
      }
    if (hp - p1 < 2)
      return -1;
    dest->sip_version = (char *) osip_malloc (hp - p1);
    osip_strncpy (dest->sip_version, p1 + 1, (hp - p1 - 1));

    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, ' ');
  /* 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;
    }

  {
    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)
{
  *index_of_str = NULL;		/* AMD fix */
  if ((NULL == str) || (NULL == buf))
    return -1;
  /* TODO? we may prefer strcasestr instead of strstr? */
  *index_of_str = strstr (buf, str);
  if (NULL == (*index_of_str))
    return -1;
  return 0;
}

/* This method replace all LWS with SP located before the
   initial CRLFCRLF found or the end of the string.
*/
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<end_of_message;tmp++)
    {
      if (('\0' == tmp[0])
	  || ('\0' == tmp[1])
	  || ('\0' == tmp[2])
	  || ('\0' == tmp[3]))
	  return;

      if ((('\r' == tmp[0]) && ('\r' == tmp[1])
	   && ('\r' == tmp[2]) && ('\r' == 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++;
	  *end_of_part = end_of_line + 1;
	  return 0;
	}
      else if ('\n' == end_of_line[0])
	{
	  *end_of_part = end_of_line + 1;
	  return 0;
	}
      start_of_line = end_of_line;
    }
}

int
osip_message_set__header (osip_message_t * sip, const char *hname, const char *hvalue)
{
  int my_index;

  if (hname == NULL)
    return -1;

  /* some headers are analysed completely      */
  /* this method is used for selective parsing */
  my_index = __osip_message_is_known_header (hname);
  if (my_index >= 0)		/* ok */
    {
      int ret;

      ret = __osip_message_call_method (my_index, sip, hvalue);
      if (ret == -1)
	{
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "Could not set header: \"%s\" %s\n", hname, hvalue));
	  return -1;
	}
      return 0;
    }
  /* unknownheader */
  if (osip_message_set_header (sip, hname, hvalue) == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "Could not set unknown header\n"));
      return -1;
    }

  return 0;
}

int
msg_handle_multiple_values (osip_message_t * sip, char *hname, char *hvalue)
{
  int i;
  char *ptr;			/* current location of the search */
  char *comma;			/* This is the separator we are elooking for */
  char *beg;			/* beg of a header */
  char *end;			/* end of a header */
  char *quote1;			/* first quote of a pair of quotes   */
  char *quote2;			/* second quuote of a pair of quotes */


  beg = hvalue;
  end = NULL;
  ptr = hvalue;
  if (hvalue == NULL)
    {
      i = osip_message_set__header (sip, hname, hvalue);
      if (i == -1)
	return -1;
      return 0;
    }

  comma = strchr (ptr, ',');


  osip_tolower (hname);

  if (comma == NULL || (strncmp (hname, "date", 4) == 0 && strlen (hname) == 4 )
      || strncmp (hname, "organization", 12) == 0 || (strncmp (hname, "to", 2) == 0 && strlen (hname) == 2) || (strncmp (hname, "from", 4) == 0 && strlen (hname) == 4)	/* AMD: BUG fix */
      || strncmp (hname, "call-id", 7) == 0 || (strncmp (hname, "cseq", 4) == 0 && strlen (hname) == 4)	/* AMD: BUG fix */
      || strncmp (hname, "subject", 7) == 0 || strncmp (hname, "user-agent", 10) == 0 || strncmp (hname, "server", 6) == 0 || strncmp (hname, "www-authenticate", 16) == 0	/* AMD: BUG fix */
      || strncmp (hname, "authentication-info", 19) == 0 || strncmp (hname, "proxy-authenticate", 20) == 0 || strncmp (hname, "proxy-authorization", 19) == 0 || strncmp (hname, "proxy-authentication-info", 25) == 0	/* AMD: BUG fix */
      || strncmp (hname, "authorization", 13) == 0)
    /* there is no multiple header! likely      */
    /* to happen most of the time...            */
    /* or hname is a TEXT-UTF8-TRIM and may     */
    /* contain a comma. this is not a separator */
    /* THIS DOES NOT WORK FOR UNKNOWN HEADER!!!! */
    {
      i = osip_message_set__header (sip, hname, hvalue);
      if (i == -1)
	return -1;
      return 0;
    }

  quote2 = NULL;
  while (comma != NULL)
    {
      quote1 = __osip_quote_find (ptr);
      if (quote1 != NULL)
	{
	  quote2 = __osip_quote_find (quote1 + 1);
	  if (quote2 == NULL)
	    return -1;		/* quotes comes by pair */
	  ptr = quote2 + 1;
	}

      if ((quote1 == NULL) || (quote1 > comma))
	{
	  end = comma;
	  comma = strchr (comma + 1, ',');
	  ptr = comma + 1;
	}
      else if ((quote1 < comma) && (quote2 < comma))
	{			/* quotes are located before the comma, */
	  /* continue the search for next quotes  */
	  ptr = quote2 + 1;
	}
      else if ((quote1 < comma) && (comma < quote2))
	{			/* if comma is inside the quotes... */
	  /* continue with the next comma.    */
	  ptr = quote2 + 1;
	  comma = strchr (ptr, ',');
	  if (comma == NULL)
	    /* this header last at the end of the line! */
	    {			/* this one does not need an allocation... */
	      if (strlen (beg) < 2)
		return 0;	/* empty header */
	      osip_clrspace (beg);
	      i = osip_message_set__header (sip, hname, beg);
	      if (i == -1)
		return -1;
	      return 0;
	    }
	}

      if (end != NULL)
	{
	  char *avalue;

	  if (end - beg + 1 < 2)
	    return -1;
	  avalue = (char *) osip_malloc (end - beg + 1);
	  osip_strncpy (avalue, beg, end - beg);
	  osip_clrspace (avalue);
	  /* really store the header in the sip structure */
	  i = osip_message_set__header (sip, hname, avalue);
	  osip_free (avalue);
	  if (i == -1)
	    return -1;
	  beg = end + 1;
	  end = NULL;
	  if (comma == NULL)
	    /* this header last at the end of the line! */
	    {			/* this one does not need an allocation... */
	      if (strlen (beg) < 2)
		return 0;	/* empty header */
	      osip_clrspace (beg);
	      i = osip_message_set__header (sip, hname, beg);