registrar/path.c

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/*
 * $Id: path.c 4518 2008-07-28 15:39:28Z henningw $
 *
 * Helper functions for Path support.
 *
 * Copyright (C) 2006 Andreas Granig <agranig@linguin.org>
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
/*!
 * \file
 * \brief SIP registrar module - Helper functions for Path support
 * \ingroup registrar   
 */  


#include "../../data_lump.h"
#include "../../parser/parse_rr.h"
#include "../../parser/parse_uri.h"
#include "path.h"
#include "reg_mod.h"

/*! \brief
 * Combines all Path HF bodies into one string.
 */
int build_path_vector(struct sip_msg *_m, str *path, str *received)
{
   static char buf[MAX_PATH_SIZE];
   char *p;
   struct hdr_field *hdr;
   struct sip_uri puri;

   rr_t *route = 0;

   path->len = 0;
   path->s = 0;
   received->s = 0;
   received->len = 0;

   if(parse_headers(_m, HDR_EOH_F, 0) < 0) {
      LM_ERR("failed to parse the message\n");
      goto error;
   }

   for( hdr=_m->path,p=buf ; hdr ; hdr=hdr->sibling) {
      /* check for max. Path length */
      if( p-buf+hdr->body.len+1 >= MAX_PATH_SIZE) {
         LM_ERR("Overall Path body exceeds max. length of %d\n",
               MAX_PATH_SIZE);
         goto error;
      }
      if(p!=buf)
         *(p++) = ',';
      memcpy( p, hdr->body.s, hdr->body.len);
      p +=  hdr->body.len;
   }

   if (p!=buf) {
      /* check if next hop is a loose router */
      if (parse_rr_body( buf, p-buf, &route) < 0) {
         LM_ERR("failed to parse Path body, no head found\n");
         goto error;
      }
      if (parse_uri(route->nameaddr.uri.s,route->nameaddr.uri.len,&puri)<0){
         LM_ERR("failed to parse the first Path URI\n");
         goto error;
      }
      if (!puri.lr.s) {
         LM_ERR("first Path URI is not a loose-router, not supported\n");
         goto error;
      }
      if (path_use_params) {
         param_hooks_t hooks;
         param_t *params;

         if (parse_params(&(puri.params),CLASS_CONTACT,&hooks,&params)!=0){
            LM_ERR("failed to parse parameters of first hop\n");
            goto error;
         }
         if (hooks.contact.received)
            *received = hooks.contact.received->body;
         /*for (;params; params = params->next) {
            if (params->type == P_RECEIVED) {
               *received = hooks.contact.received->body;
               break;
            }
         }*/
         free_params(params);
      }
      free_rr(&route);
   }

   path->s = buf;
   path->len = p-buf;
   return 0;
error:
   if(route) free_rr(&route);
   return -1;
}