msg_parser.c

libosip-0.9.7源码

/*
  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 <osip/smsg.h>
#include <osip/port.h>
#include "msg.h"



static int
startline_parsereq (startline_t * dest, char *buf, char **headers)
{
  char *p1;
  char *p2;
  char *requesturi;
  int i;

  dest->sipmethod = NULL;
  dest->statuscode = NULL;
  dest->reasonphrase = 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->sipmethod = (char *) smalloc (p2 - buf + 1);
  sstrncpy (dest->sipmethod, 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 *) smalloc (p1 - p2);
  sstrncpy (requesturi, p2 + 1, (p1 - p2 - 1));
  sclrspace (requesturi);

  url_init (&(dest->rquri));
  i = url_parse (dest->rquri, requesturi);
  sfree (requesturi);
  if (i == -1)
    return -1;

  /* find the the version and the beginning of headers */
  {
    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->sipversion = (char *) smalloc (hp - p1);
    sstrncpy (dest->sipversion, p1 + 1, (hp - p1 - 1));

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

static int
startline_parseresp (startline_t * dest, char *buf, char **headers)
{
  char *statuscode;
  char *reasonphrase;

  dest->rquri = NULL;
  dest->sipmethod = NULL;

  *headers = buf;

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

  reasonphrase = strchr (statuscode + 1, ' ');
  dest->statuscode = (char *) smalloc (reasonphrase - statuscode);
  sstrncpy (dest->statuscode, statuscode + 1, reasonphrase - statuscode - 1);

  {
    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->reasonphrase = (char *) smalloc (hp - reasonphrase);
    sstrncpy (dest->reasonphrase, reasonphrase + 1, hp - reasonphrase - 1);

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

/* return size of request URI */
static int
msg_startline_parse (startline_t * dest, char *buf, char **headers)
{

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

int
find_next_occurence (char *str, char *buf, 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 ((const char *) buf, (const char *) str);
  if (NULL == (*index_of_str))
    return -1;
  return 0;
}

int
find_next_crlf (char *start_of_header, char **end_of_header)
{
  char *tmp;

  *end_of_header = NULL;	/* AMD fix */
  for (;;)
    {
      int leol = 1;		/* number of line-end symbols: */

      /* if CR or LF =1, if CRLF =2  */
      char *soh = start_of_header;

      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 */
	  tmp = soh + 1;
	  leol = 2;
	}
      else
	tmp = soh;		/* case 2 or 3: CR or LF is the separator */


      /* VERIFY if TMP is the end of header or LWS.            */
      /* LWS are extra SP, HT, CR and LF contained in headers. */
      if ((' ' == tmp[1]) || ('\t' == tmp[1]))
	{
	  /* AMD fix: SPECIAL case! for people who add extra spaces  */
	  /* with no meaning at the end of the body of SIP messages? */
	  /* if this occur before the body, this is an error case    */
	  /* because the last header of a message MUST end with a    */
	  /* CRLFCRLF (not only CRLF). I prefer to assume that buggy */
	  /* implementation exists... :( */
	  char *extraspaces = tmp + 2;

	  /* replace line end and TAB symbols by SP */
	  tmp[1] = ' ';
	  tmp[0] = ' ';
	  if (2 == leol)
	    tmp[-1] = ' ';

	  for (;;)
	    {			/* this is for line ending with '\cr\lf\t    ' (i.e more than one space after tab) */
	      if (' ' == *extraspaces)
		extraspaces++;
	      else if ('\t' == *extraspaces)
		{
		  *extraspaces = ' ';
		  extraspaces++;
		}
	      else if ('\0' == *extraspaces)
		{
		  tmp[1] = '\0';	/* this is the real limit of SIP message */
		  *end_of_header = tmp + 1;
		  return 0;
		}
	      else
		break;
	    }
	  /* YES, this is LWS extra characters    */
	  /* restart search of the end of headers */
	  start_of_header = extraspaces;
	}
      else
	{
	  *end_of_header = tmp + 1;	/* beggining of next header */
	  return 0;
	}
    }
}

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

  start_of_line = start_of_part;

  for (;;)
    {
      i = 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
msg_set_header (sip_t * sip, char *hname, char *hvalue)
{
  int my_index;

  if (hname == NULL)
    return -1;
  stolowercase (hname);

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

      ret = parser_callmethod (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 (msg_setheader (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 (sip_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 = msg_set_header (sip, hname, hvalue);
      if (i == -1)
	return -1;
      return 0;
    }

  comma = strchr (ptr, ',');


  stolowercase (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 = msg_set_header (sip, hname, hvalue);
      if (i == -1)
	return -1;
      return 0;
    }

  quote2 = NULL;
  while (comma != NULL)
    {
      quote1 = quote_find (ptr);
      if (quote1 != NULL)
	{
	  quote2 = 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 */
	      sclrspace (beg);
	      i = msg_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 *) smalloc (end - beg + 1);
	  sstrncpy (avalue, beg, end - beg);
	  sclrspace (avalue);
	  /* really store the header in the sip structure */
	  i = msg_set_header (sip, hname, avalue);
	  sfree (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 */
	      sclrspace (beg);
	      i = msg_set_header (sip, hname, beg);
	      if (i == -1)
		return -1;
	      return 0;
	    }
	}
    }
  return -1;			/* if comma is NULL, we should have already return 0 */
}

/* set all headers */
int
msg_headers_parse (sip_t * sip, char *start_of_header, char **body)
{
  char *colon_index;		/* index of ':' */
  char *hname;