parse_from.c

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/*
 * $Id: parse_from.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
 *
 * History:
 * --------
 * 2005-07-12 missing TAG is reported as error (bogdan)
 */

/*!
 * \file
 * \brief Parse from header
 * \ingroup parser
 */

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

/*!
 * This method is used to parse the from header. It was decided not to parse
 * anything in core that is not *needed* so this method gets called by 
 * rad_acc module and any other modules that needs the FROM header.
 * \param msg sip msg
 * \return 0 on success, negative result on failure.
 */
int parse_from_header( struct sip_msg *msg)
{
   struct to_body* from_b;

   if ( !msg->from && ( parse_headers(msg,HDR_FROM_F,0)==-1 || !msg->from)) {
      LM_ERR("bad msg or missing FROM header\n");
      goto error;
   }

   /* maybe the header is already parsed! */
   if (msg->from->parsed)
      return 0;

   /* bad luck! :-( - we have to parse it */
   /* first, get some memory */
   from_b = pkg_malloc(sizeof(struct to_body));
   if (from_b == 0) {
      LM_ERR("out of pkg_memory\n");
      goto error;
   }

   /* now parse it!! */
   memset(from_b, 0, sizeof(struct to_body));
   parse_to(msg->from->body.s,msg->from->body.s+msg->from->body.len+1,from_b);
   if (from_b->error == PARSE_ERROR) {
      LM_ERR("bad from header\n");
      pkg_free(from_b);
      set_err_info(OSER_EC_PARSER, OSER_EL_MEDIUM, "error parsing From");
      set_err_reply(400, "bad From header");
      goto error;
   }
   /* REGISTER doesn't have a from tag :( -bogdan
   if (from_b->tag_value.len==0 || from_b->tag_value.s==0) {
      LM_ERR("missing TAG value\n");
      free_to(from_b);
      goto error;
   }
   */
   msg->from->parsed = from_b;

   return 0;
error:
   return -1;
}

struct sip_uri *parse_from_uri(struct sip_msg *msg)
{
   struct to_body *tb = NULL;
   
   if(msg==NULL)
      return NULL;

   if(parse_from_header(msg)<0)
   {
      LM_ERR("cannot parse FROM header\n");
      return NULL;
   }
   
   if(msg->from==NULL || get_from(msg)==NULL)
      return NULL;

   tb = get_from(msg);

   if(tb->parsed_uri.user.s!=NULL || tb->parsed_uri.host.s!=NULL)
      return &tb->parsed_uri;

   if (parse_uri(tb->uri.s, tb->uri.len , &tb->parsed_uri)<0)
   {
      LM_ERR("failed to parse From uri\n");
      memset(&tb->parsed_uri, 0, sizeof(struct sip_uri));
      set_err_info(OSER_EC_PARSER, OSER_EL_MEDIUM, "error parsing From uri");
      set_err_reply(400, "bad From uri");
      return NULL;
   }

   return &tb->parsed_uri;
}