parse_diversion.c

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/*
 * $Id: parse_diversion.c 4720 2008-08-23 10:56:15Z henningw $
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * 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 Parse diversion header field
 * \ingroup parser
 */

#include <stdlib.h>
#include <string.h> 
#include "../dprint.h"
#include "../ut.h"
#include "../mem/mem.h"
#include "parse_from.h"
#include "parse_to.h"
#include "msg_parser.h"

/*!
 * \brief This method is used to parse the DIVERSION header
 * \param msg sip msg
 * \return 0 on success, -1 on failure.
 */
int parse_diversion_header(struct sip_msg *msg)
{
   struct to_body* diversion_b;
   
   if (!msg->diversion && (parse_headers(msg, HDR_DIVERSION_F, 0) == -1 ||
            !msg->diversion)) {
      goto error;
   }
 
   /* maybe the header is already parsed! */
   if (msg->diversion->parsed)
      return 0;
 
   /* bad luck! :-( - we have to parse it */
   /* first, get some memory */
   diversion_b = pkg_malloc(sizeof(struct to_body));
   if (diversion_b == 0) {
      LM_ERR("out of pkg_memory\n");
      goto error;
   }
 
   /* now parse it!! */
   memset(diversion_b, 0, sizeof(struct to_body));
   parse_to(msg->diversion->body.s, msg->diversion->body.s + msg->diversion->body.len + 1, diversion_b);
   if (diversion_b->error == PARSE_ERROR) {
      LM_ERR("bad diversion header\n");
      pkg_free(diversion_b);
      goto error;
   }
   msg->diversion->parsed = diversion_b;
   
   return 0;
 error:
   return -1;
}


/*!
 * Get value of given diversion parameter
 */
str *diversion_param(struct sip_msg *msg, str name)
{
    struct to_param *params;

    if (parse_diversion_header(msg) == -1) {
   LM_ERR("could not get diversion parameter\n");
   return 0;
    }

    params =  ((struct to_body*)(msg->diversion->parsed))->param_lst;

    while (params) {
   if ((params->name.len == name.len) &&
       (strncmp(params->name.s, name.s, name.len) == 0)) {
       return &(params->value);
   }
   params = params->next;
    }

    return 0;
}