msg_parser.c

libosip-0.9.7源码

  char *hvalue;
  char *end_of_header;
  int i;

  for (;;)
    {
      i = 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 *) smalloc (colon_index - start_of_header + 1);
      sstrncpy (hname, start_of_header, colon_index - start_of_header);
      sclrspace (hname);

      {
	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 *) smalloc ((end) - colon_index);
	    sstrncpy (hvalue, colon_index + 1, (end) - colon_index - 1);
	    sclrspace (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);

      sfree (hname);
      sfree (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;
}


/* internal method to parse the body */
int
msg_body_parse (sip_t * sip, char *start_of_buf, char **next_body)
{
  char *start_of_body;
  char *end_of_body;
  char *tmp;
  int i;

  char *sep_boundary;
  generic_param_t *ct_param;

  /* if MIME-Version: does not exist we just have */
  /* to deal with one body and no header... */
  if (sip->mime_version == NULL)
    {				/* Mime-Version header does NOT exist */
      if (sip->content_type == NULL)
	return 0;		/* no body is attached */
      else
	{
	  size_t 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->contentlength != NULL)
	    body_len = satoi (sip->contentlength->value);
	  else
	    {			/* if content_length does not exist, set it. */
	      char *tmp = smalloc (8);

	      if (tmp == NULL)
		return -1;
	      body_len = strlen (start_of_body);
	      sprintf (tmp, "%i", body_len);
	      i = msg_setcontent_length (sip, tmp);
	      sfree (tmp);
	      if (i != 0)
		return -1;
	    }

	  if (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 + body_len;
	  tmp = smalloc (end_of_body - start_of_body + 2);
	  if (tmp == NULL)
	    return -1;
	  sstrncpy (tmp, start_of_body, end_of_body - start_of_body);

	  i = msg_setbody (sip, tmp);
	  sfree (tmp);
	  if (i != 0)
	    return -1;
	  return 0;
	}
    }

  /* find the boundary */
  i = generic_param_getbyname (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 *) smalloc (strlen (ct_param->gvalue) + 3);
  sprintf (sep_boundary, "--%s", ct_param->gvalue);

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

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

      tmp = smalloc (end_of_body - start_of_body + 1);
      sstrncpy (tmp, start_of_body, end_of_body - start_of_body);

      i = msg_setbody_mime (sip, tmp);
      sfree (tmp);
      if (i == -1)
	{
	  sfree (sep_boundary);
	  return -1;
	}

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


/* sip_t *sip is filled while analysing buf */
int
msg_parse (sip_t * sip, char *buf)
{
  int i;
  char *next_header_index;

  /* parse request or status line */
  i = msg_startline_parse (sip->strtline, buf, &next_header_index);
  if (i == -1)
    {
      OSIP_TRACE (osip_trace
		  (__FILE__, __LINE__, OSIP_ERROR, NULL,
		   "error in msg_startline_init()\n"));
      return -1;
    }
  buf = next_header_index;

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

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

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

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

  return 0;
}

/* This method just add a received parameter in the Via
   as requested by rfc3261 */
int
msg_fix_last_via_header (sip_t * request, char *ip_addr, int port)
{
  generic_param_t *rport;
  via_t *via;
  /* get Top most Via header: */
  if (request == NULL || request->strtline == NULL)
    return -1;
  if (MSG_IS_RESPONSE (request))
    return 0;			/* Don't fix Via header */

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

  via_param_getbyname (via, "rport", &rport);
  if (rport != NULL)
    {
      if (rport->gvalue == NULL)
	{
	  rport->gvalue = (char *) smalloc (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;
  via_set_received (via, sgetcopy (ip_addr));
  return 0;
}

char *
msg_getreason (int replycode)
{
  int i;

  i = replycode / 100;
  if (i == 1)
    {				/* 1xx  */
      if (replycode == 100)
	return sgetcopy ("Trying");
      if (replycode == 180)
	return sgetcopy ("Ringing");
      if (replycode == 181)
	return sgetcopy ("Call Is Being Forwarded");
      if (replycode == 182)
	return sgetcopy ("Queued");
      if (replycode == 183)
	return sgetcopy ("Session Progress");
    }
  if (i == 2)
    {				/* 2xx */
      return sgetcopy ("OK");
    }
  if (i == 3)
    {				/* 3xx */
      if (replycode == 300)
	return sgetcopy ("Multiple Choices");
      if (replycode == 301)
	return sgetcopy ("Moved Permanently");
      if (replycode == 302)
	return sgetcopy ("Moved Temporarily");
      if (replycode == 305)
	return sgetcopy ("Use Proxy");
      if (replycode == 380)
	return sgetcopy ("Alternative Service");
    }
  if (i == 4)
    {				/* 4xx */
      if (replycode == 400)
	return sgetcopy ("Bad Request");
      if (replycode == 401)
	return sgetcopy ("Unauthorized");
      if (replycode == 402)
	return sgetcopy ("Payment Required");
      if (replycode == 403)
	return sgetcopy ("Forbidden");
      if (replycode == 404)
	return sgetcopy ("Not Found");
      if (replycode == 405)
	return sgetcopy ("Method Not Allowed");
      if (replycode == 406)
	return sgetcopy ("Not Acceptable");
      if (replycode == 407)
	return sgetcopy ("Proxy Authentication Required");
      if (replycode == 408)
	return sgetcopy ("Request Timeout");
      if (replycode == 409)
	return sgetcopy ("Conflict");
      if (replycode == 410)
	return sgetcopy ("Gone");
      if (replycode == 411)
	return sgetcopy ("Length Required");
      if (replycode == 413)
	return sgetcopy ("Request Entity Too Large");
      if (replycode == 414)
	return sgetcopy ("Request-URI Too Large");
      if (replycode == 415)
	return sgetcopy ("Unsupported Media Type");
      if (replycode == 416)
	return sgetcopy ("Unsupported Uri Scheme");
      if (replycode == 420)
	return sgetcopy ("Bad Extension");
      /* 
         Robin Nayathodan <[e-mail]> 
         N.K Electronics INDIA

         RFC 3261 10.3.7 
       */
      if (replycode == 423)
	return sgetcopy ("Interval Too Short");
      if (replycode == 480)
	return sgetcopy ("Temporarily not available");
      if (replycode == 481)
	return sgetcopy ("Call Leg/Transaction Does Not Exist");
      if (replycode == 482)
	return sgetcopy ("Loop Detected");
      if (replycode == 483)
	return sgetcopy ("Too Many Hops");
      if (replycode == 484)
	return sgetcopy ("Address Incomplete");
      if (replycode == 485)
	return sgetcopy ("Ambiguous");
      if (replycode == 486)
	return sgetcopy ("Busy Here");
      if (replycode == 487)
	return sgetcopy ("Request Cancelled");
      if (replycode == 488)
	return sgetcopy ("Not Acceptable Here");
      if (replycode == 489)
	return sgetcopy ("Bad Event");
    }
  if (i == 5)
    {				/* 5xx */
      if (replycode == 500)
	return sgetcopy ("Internal Server Error");
      if (replycode == 501)
	return sgetcopy ("Not Implemented");
      if (replycode == 502)
	return sgetcopy ("Bad Gateway");
      if (replycode == 503)
	return sgetcopy ("Service Unavailable");
      if (replycode == 504)
	return sgetcopy ("Gateway Time-out");
      if (replycode == 505)
	return sgetcopy ("SIP Version not supported");
    }
  if (i == 6)
    {				/* 6xx */
      if (replycode == 600)
	return sgetcopy ("Busy Everywhere");
      if (replycode == 603)
	return sgetcopy ("Decline");
      if (replycode == 604)
	return sgetcopy ("Does not exist anywhere");
      if (replycode == 606)
	return sgetcopy ("Not Acceptable");
    }

  return NULL;
}