/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001,2002,2003  Aymeric MOIZARD jack@atosc.org
  
  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_handle_multiple_values (osip_message_t * sip, char *hname,
				       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);
static int msg_osip_body_parse2 (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;

  /* 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==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_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 != 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;
    }

  {
    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.
*/
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 < end_of_message; 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++;
	  *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;
    }
}

static 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;
}

static 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, "expires", 7) == 0
      || 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);
	      if (i == -1)
		return -1;
	      return 0;
	    }
	}
    }
  return -1;			/* if comma is NULL, we should have already return 0 */
}

/* set all headers */
static int
msg_headers_parse (osip_message_t * sip, const char *start_of_header,
		   const char **body)
{
  const char *colon_index;	/* index of ':' */
  char *hname;
  char *hvalue;
  const char *end_of_header;
  int i;

  for (;;)
    {
      i = __osip_find_next_crlf (start_of_header, &end_of_header);
      if (i == -1)
	{
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "End of header Not found\n"));
	  return -1;		/* this is an error case!     */
	}
      if (end_of_header[0] == '\0')
	{			/* final CRLF is missing */
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "SIP message does not end with CRLFCRLF\n"));
	  return -1;
	}
      /* find the header name */
      colon_index = strchr (start_of_header, ':');
      if (colon_index == NULL)
	{
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "End of header Not found\n"));
	  return -1;		/* this is also an error case */
	}
      if (colon_index - start_of_header + 1 < 2)
	return -1;
      if (end_of_header <= colon_index)
	{
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "Malformed message\n"));
	  return -1;
	}
      hname = (char *) osip_malloc (colon_index - start_of_header + 1);
      osip_strncpy (hname, start_of_header, colon_index - start_of_header);
      osip_clrspace (hname);

      {
	const char *end;

	/* END of header is (end_of_header-2) if header separation is CRLF */
	/* END of header is (end_of_header-1) if header separation is CR or LF */
	if ((end_of_header[-2] == '\r') || (end_of_header[-2] == '\n'))
	  end = end_of_header - 2;
	else
	  end = end_of_header - 1;
	if ((end) - colon_index < 2)
	  hvalue = NULL;	/* some headers (subject) can be empty */
	else
	  {
	    hvalue = (char *) osip_malloc ((end) - colon_index);
	    osip_strncpy (hvalue, colon_index + 1, (end) - colon_index - 1);
	    osip_clrspace (hvalue);
	  }
      }

      /* hvalue MAY contains multiple value. In this case, they   */
      /* are separated by commas. But, a comma may be part of a   */
      /* quoted-string ("here, and there" is an example where the */
      /* comma is not a separator!) */
      i = msg_handle_multiple_values (sip, hname, hvalue);

      osip_free (hname);
      osip_free (hvalue);
      if (i == -1)
	{
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "End of header Not found\n"));
	  return -1;
	}

      /* the list of headers MUST always end with  */
      /* CRLFCRLF (also CRCR and LFLF are allowed) */
      if ((end_of_header[0] == '\r') || (end_of_header[0] == '\n'))
	{
	  *body = end_of_header;
	  return 0;		/* end of header found        */
	}
      /* continue on the next header */
      start_of_header = end_of_header;
    }

/* Unreachable code
 OSIP_TRACE (osip_trace
	      (__FILE__, __LINE__, OSIP_BUG, NULL,
	       "This code cannot be reached\n")); */
  return -1;
}

static int
msg_osip_body_parse2 (osip_message_t * sip, const char *start_of_buf,
		      const char **next_body, size_t length)
{
  const char *start_of_body;
  const char *end_of_body;
  char *tmp;
  int i;

  char *sep_boundary;
  osip_generic_param_t *ct_param;

  if (sip->content_type == NULL
      ||sip->content_type->type==NULL
      ||sip->content_type->subtype==NULL)
    return 0;		/* no body is attached */
  
  if (0!=osip_strcasecmp(sip->content_type->type, "multipart"))
    {
      size_t osip_body_len;
      
      if (start_of_buf[0] == '\0')
	return -1;		/* final CRLF is missing */
      /* get rid of the first CRLF */
      if ('\r' == start_of_buf[0])
	{
	  if ('\n' == start_of_buf[1])
	    start_of_body = start_of_buf + 2;
	  else
	    start_of_body = start_of_buf + 1;
	}
      else if ('\n' == start_of_buf[0])
	start_of_body = start_of_buf + 1;
      else
	return -1;	/* message does not end with CRLFCRLF, CRCR or LFLF */
      
      /* update length (without CRLFCRLF */
      length = length-(start_of_buf-start_of_body);
      if (length<=2)
	return -1;
      
      if (sip->content_length != NULL)
	osip_body_len = osip_atoi (sip->content_length->value);
      else
	{
	  /* if content_length does not exist, set it. */
	  char tmp[16];
	  
	  /* case where content-length is missing but the
		 body only contains non-binary data */
	  if (0==osip_strcasecmp(sip->content_type->type, "application")
	      && 0==osip_strcasecmp(sip->content_type->subtype,"sdp"))
	    {
	      osip_body_len = strlen (start_of_body);
	      sprintf (tmp, "%i", osip_body_len);
	      i = osip_message_set_content_length (sip, tmp);
	      if (i != 0)
		return -1;
	    }
	  else return -1; /* Content-type may be non binary data */
	}
      
      if (length<osip_body_len)
	{
	  OSIP_TRACE (osip_trace
		      (__FILE__, __LINE__, OSIP_ERROR, NULL,
		       "Message was not receieved enterely. lenngth=%i osip_body_len=%i\n",length, osip_body_len));
	  return -1;
	}

      end_of_body = start_of_body + osip_body_len;
      tmp = osip_malloc (end_of_body - start_of_body + 2);
      if (tmp == NULL)
	return -1;
      memcpy (tmp, start_of_body, end_of_body - start_of_body);
      
      i = osip_message_set_body (sip, tmp);
      osip_free (tmp);
      if (i != 0)
	return -1;
      return 0;
    }

  /* find the boundary */
  i = osip_generic_param_get_byname (sip->content_type->gen_params,
				     "boundary", &ct_param);
  if (i != 0)
    return -1;

  if (ct_param == NULL)
    return -1;
  if (ct_param->gvalue == NULL)
    return -1;			/* No boundary but multiple headers??? */

  sep_boundary = (char *) osip_malloc (strlen (ct_param->gvalue) + 3);
  sprintf (sep_boundary, "--%s", ct_param->gvalue);

  *next_body = NULL;
  start_of_body = start_of_buf;
  for (;;)
    {
      i =
	__osip_find_next_occurence (sep_boundary, start_of_body,
				    &start_of_body);
      if (i == -1)
	{
	  osip_free (sep_boundary);
	  return -1;
	}
      i =
	__osip_find_next_occurence (sep_boundary,
				    start_of_body + strlen (sep_boundary),
				    &end_of_body);
      if (i == -1)
	{
	  osip_free (sep_boundary);
	  return -1;
	}

      /* this is the real beginning of body */
      start_of_body = start_of_body + strlen (sep_boundary) + 2;

      tmp = osip_malloc (end_of_body - start_of_body + 1);
      memcpy (tmp, start_of_body, end_of_body - start_of_body);
      tmp[end_of_body - start_of_body]='\0';

      i = osip_message_set_body_mime (sip, tmp);
      osip_free (tmp);
      if (i == -1)
	{
	  osip_free (sep_boundary);
	  return -1;
	}

      if (strncmp (end_of_body + strlen (sep_boundary), "--", 2) == 0)
	{			/* end of all bodies */
	  *next_body = end_of_body;
	  osip_free (sep_boundary);
	  return 0;
	}
      /* continue on the next body */
      start_of_body = end_of_body;
    }
  /* Unreachable code */
  /* osip_free (sep_boundary); */
  return -1;
}

/* internal method to parse the body */
static int
msg_osip_body_parse (osip_message_t * sip, const char *start_of_buf,
		     const char **next_body)
{
  const char *start_of_body;
  const char *end_of_body;
  char *tmp;
  int i;

  char *sep_boundary;
  osip_generic_param_t *ct_param;

  if (sip->content_type == NULL
      ||sip->content_type->type==NULL
      ||sip->content_type->subtype==NULL)
    return 0;		/* no body is attached */
  
  if (0!=osip_strcasecmp(sip->content_type->type, "multipart"))
    {
      size_t osip_body_len;
      
      if (start_of_buf[0] == '\0')
	return -1;		/* final CRLF is missing */
      /* get rid of the first CRLF */
      if ('\r' == start_of_buf[0])
	{
	  if ('\n' == start_of_buf[1])
	    start_of_body = start_of_buf + 2;
	  else
	    start_of_body = start_of_buf + 1;
	}
      else if ('\n' == start_of_buf[0])
	start_of_body = start_of_buf + 1;
      else
	return -1;	/* message does not end with CRLFCRLF, CRCR or LFLF */
      
      if (sip->content_length != NULL)
	osip_body_len = osip_atoi (sip->content_length->value);
      else
	{			/* if content_length does not exist, set it. */
	  char tmp[16];
	  
	  osip_body_len = strlen (start_of_body);
	  sprintf (tmp, "%i", osip_body_len);
	  i = osip_message_set_content_length (sip, tmp);
	  if (i != 0)
	    return -1;
	}
      
      if (osip_body_len > strlen (start_of_body))	/* we do not receive the */
	return -1;		/* complete message      */
      /* end_of_body = start_of_body + strlen(start_of_body); */
      end_of_body = start_of_body + osip_body_len;
      tmp = osip_malloc (end_of_body - start_of_body + 2);
      if (tmp == NULL)
	return -1;
      osip_strncpy (tmp, start_of_body, end_of_body - start_of_body);
      
      i = osip_message_set_body (sip, tmp);
      osip_free (tmp);
      if (i != 0)
	return -1;
      return 0;
    }

  /* find the boundary */
  i = osip_generic_param_get_byname (sip->content_type->gen_params,
				     "boundary", &ct_param);
  if (i != 0)
    return -1;

  if (ct_param == NULL)
    return -1;
  if (ct_param->gvalue == NULL)
    return -1;			/* No boundary but multiple headers??? */

  sep_boundary = (char *) osip_malloc (strlen (ct_param->gvalue) + 3);
  sprintf (sep_boundary, "--%s", ct_param->gvalue);

  *next_body = NULL;
  start_of_body = start_of_buf;
  for (;;)
    {
      i =
	__osip_find_next_occurence (sep_boundary, start_of_body,
				    &start_of_body);
      if (i == -1)
	{
	  osip_free (sep_boundary);
	  return -1;
	}
      i =
	__osip_find_next_occurence (sep_boundary,
				    start_of_body + strlen (sep_boundary),
				    &end_of_body);
      if (i == -1)
	{
	  osip_free (sep_boundary);
	  return -1;
	}

      /* this is the real beginning of body */
      start_of_body = start_of_body + strlen (sep_boundary) + 2;

      tmp = osip_malloc (end_of_body - start_of_body + 1);
      osip_strncpy (tmp, start_of_body, end_of_body - start_of_body);

      i = osip_message_set_body_mime (sip, tmp);
      osip_free (tmp);
      if (i == -1)
	{
	  osip_free (sep_boundary);
	  return -1;
	}

      if (strncmp (end_of_body + strlen (sep_boundary), "--", 2) == 0)
	{			/* end of all bodies */
	  *next_body = end_of_body;
	  osip_free (sep_boundary);
	  return 0;
	}
      /* continue on the next body */
      start_of_body = end_of_body;
    }
  /* Unreachable code */
  /* osip_free (sep_boundary); */
  return -1;
}

/* osip_message_t *sip is filled while analysing buf */
int
osip_message_parse2 (osip_message_t * sip, const char *buf, size_t length)
{
  int i;
  const char *next_header_index;
  char *tmp;
  char *beg;
#ifdef WIN32
  tmp = _alloca (length + 2);
#else
  tmp = alloca (length + 2);
#endif
  if (tmp==NULL)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "Could not allocate memory.\n"));
      return -1;
    }
  beg=tmp;
  memcpy (tmp, buf, length); /* may contain binary data */
  tmp[length]='\0';
  osip_util_replace_all_lws (tmp);
  /* parse request or status line */
  i = __osip_message_startline_parse (sip, tmp, &next_header_index);
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "Could not parse start line of message.\n"));
      return -1;
    }
  tmp = (char *) next_header_index;

  /* parse headers */
  i = msg_headers_parse (sip, tmp, &next_header_index);
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "error in msg_headers_parse()\n"));
      return -1;
    }
  tmp = (char *) next_header_index;

  /* this is a *very* simple test... (which handle most cases...) */
  if (strlen (tmp) < 3)
    {
      /* this is mantory in the oSIP stack */
      if (sip->content_length == NULL)
	osip_message_set_content_length (sip, "0");
      return 0;			/* no body found */
    }

  i = msg_osip_body_parse2 (sip, tmp, &next_header_index, length-(beg-tmp));
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "error in msg_osip_body_parse()\n"));
      return -1;
    }

  /* this is mandatory in the oSIP stack */
  if (sip->content_length == NULL)
    osip_message_set_content_length (sip, "0");

  return 0;
}

/* osip_message_t *sip is filled while analysing buf */
int
osip_message_parse (osip_message_t * sip, const char *buf)
{
  int i;
  const char *next_header_index;
  char *tmp;

#ifdef WIN32
  tmp = _alloca (strlen (buf) + 2);
#else
  tmp = alloca (strlen (buf) + 2);
#endif
  osip_strncpy (tmp, buf, strlen (buf));
  osip_util_replace_all_lws (tmp);
  /* parse request or status line */
  i = __osip_message_startline_parse (sip, tmp, &next_header_index);
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "Could not parse start line of message.\n"));
      return -1;
    }
  tmp = (char *) next_header_index;

  /* parse headers */
  i = msg_headers_parse (sip, tmp, &next_header_index);
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "error in msg_headers_parse()\n"));
      return -1;
    }
  tmp = (char *) next_header_index;

  /* this is a *very* simple test... (which handle most cases...) */
  if (strlen (tmp) < 3)
    {
      /* this is mantory in the oSIP stack */
      if (sip->content_length == NULL)
	osip_message_set_content_length (sip, "0");
      return 0;			/* no body found */
    }

  i = msg_osip_body_parse (sip, tmp, &next_header_index);
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "error in msg_osip_body_parse()\n"));
      return -1;
    }
  tmp = (char *) next_header_index;

  /* this is mandatory in the oSIP stack */
  if (sip->content_length == NULL)
    osip_message_set_content_length (sip, "0");

  return 0;
}

/* This method just add a received parameter in the Via
   as requested by rfc3261 */
int
osip_message_fix_last_via_header (osip_message_t * request,
				  const char *ip_addr, int port)
{
  osip_generic_param_t *rport;
  osip_via_t *via;
  /* get Top most Via header: */
  if (request == NULL)
    return -1;
  if (MSG_IS_RESPONSE (request))
    return 0;			/* Don't fix Via header */

  via = osip_list_get (request->vias, 0);
  if (via == NULL || via->host == NULL)
    /* Hey, we could build it? */
    return -1;

  osip_via_param_get_byname (via, "rport", &rport);
  if (rport != NULL)
    {
      if (rport->gvalue == NULL)
	{
	  rport->gvalue = (char *) osip_malloc (9);
#if (defined WIN32 || defined _WIN32_WCE)
	  _snprintf (rport->gvalue, 8, "%i", port);
#else
	  snprintf (rport->gvalue, 8, "%i", port);
#endif
	}			/* else bug? */
    }

  /* only add the received parameter if the 'sent-by' value does not contains
     this ip address */
  if (0 == strcmp (via->host, ip_addr))	/* don't need the received parameter */
    return 0;
  osip_via_set_received (via, osip_strdup (ip_addr));
  return 0;
}

const char *
osip_message_get_reason (int replycode)
{
  struct code_to_reason
  {
    int code;
    const char *reason;
  };

  static const struct code_to_reason reasons1xx[] = {
    {100, "Trying"},
    {180, "Ringing"},
    {181, "Call Is Being Forwarded"},
    {182, "Queued"},
    {183, "Session Progress"},
  };
  static const struct code_to_reason reasons2xx[] = {
    {200, "OK"},
    {202, "Accepted"},
  };
  static const struct code_to_reason reasons3xx[] = {
    {300, "Multiple Choices"},
    {301, "Moved Permanently"},
    {302, "Moved Temporarily"},
    {305, "Use Proxy"},
    {380, "Alternative Service"},
  };
  static const struct code_to_reason reasons4xx[] = {
    {400, "Bad Request"},
    {401, "Unauthorized"},
    {402, "Payment Required"},
    {403, "Forbidden"},
    {404, "Not Found"},
    {405, "Method Not Allowed"},
    {406, "Not Acceptable"},
    {407, "Proxy Authentication Required"},
    {408, "Request Timeout"},
    {409, "Conflict"},
    {410, "Gone"},
    {411, "Length Required"},
    {413, "Request Entity Too Large"},
    {414, "Request-URI Too Large"},
    {415, "Unsupported Media Type"},
    {416, "Unsupported Uri Scheme"},
    {420, "Bad Extension"},
    {423, "Interval Too Short"},
    {480, "Temporarily not available"},
    {481, "Call Leg/Transaction Does Not Exist"},
    {482, "Loop Detected"},
    {483, "Too Many Hops"},
    {484, "Address Incomplete"},
    {485, "Ambiguous"},
    {486, "Busy Here"},
    {487, "Request Cancelled"},
    {488, "Not Acceptable Here"},
    {489, "Bad Event"},
  };
  static const struct code_to_reason reasons5xx[] = {
    {500, "Internal Server Error"},
    {501, "Not Implemented"},
    {502, "Bad Gateway"},
    {503, "Service Unavailable"},
    {504, "Gateway Time-out"},
    {505, "SIP Version not supported"},
  };
  static const struct code_to_reason reasons6xx[] = {
    {600, "Busy Everywhere"},
    {603, "Decline"},
    {604, "Does not exist anywhere"},
    {606, "Not Acceptable"}
  };
  const struct code_to_reason *reasons;
  int len, i;

  switch (replycode / 100)
    {
    case 1:
      reasons = reasons1xx;
      len = sizeof (reasons1xx) / sizeof (*reasons);
      break;
    case 2:
      reasons = reasons2xx;
      len = sizeof (reasons2xx) / sizeof (*reasons);
      break;
    case 3:
      reasons = reasons3xx;
      len = sizeof (reasons3xx) / sizeof (*reasons);
      break;
    case 4:
      reasons = reasons4xx;
      len = sizeof (reasons4xx) / sizeof (*reasons);
      break;
    case 5:
      reasons = reasons5xx;
      len = sizeof (reasons5xx) / sizeof (*reasons);
      break;
    case 6:
      reasons = reasons6xx;
      len = sizeof (reasons6xx) / sizeof (*reasons);
      break;
    default:
      return NULL;
    }

  for (i = 0; i < len; i++)
    if (reasons[i].code == replycode)
      return reasons[i].reason;

  /* Not found. */
  return NULL;
}