parse_cseq.c

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/*
 * $Id: parse_cseq.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 CSEQ header field
 * \ingroup parser
 */

#include "parse_cseq.h"
#include "parser_f.h"  /* eat_space_end and so on */
#include "../dprint.h"
#include "parse_def.h"
#include "parse_methods.h"
#include "../mem/mem.h"

/*!
 * Parse CSeq header field
 */
char* parse_cseq(char *buf, char* end, struct cseq_body* cb)
{
   char *t, *m, *m_end;
   
   cb->error=PARSE_ERROR;
   t=buf;
   
   cb->number.s=t;
   t=eat_token_end(t, end);
   if (t>=end) goto error;
   cb->number.len=t-cb->number.s;

   m=eat_space_end(t, end);
   m_end=eat_token_end(m, end);

   if (m_end>=end) {
         LM_ERR("method terminated unexpectedly\n");
         goto error;
   }
   if (m_end==m){
      /* null method*/
      LM_ERR("no method found\n");
      goto error;
   }
   cb->method.s=m;
   t=m_end;
   cb->method.len=t-cb->method.s;
   
   /* cache the method id */
   if(parse_method(cb->method.s, t, (unsigned int*)&cb->method_id)==0)
   {
      LM_ERR("cannot parse the method\n");
      goto error;
   }
   
   /* there may be trailing LWS 
    * (it was not my idea to put it in SIP; -jiri )
    */
   t=eat_lws_end(t, end);
   /*check if the header ends here*/
   if (t>=end) {
      LM_ERR("strange EoHF\n");
      goto error;
   }
   if (*t=='\r' && t+1<end && *(t+1)=='\n') {
         cb->error=PARSE_OK;
         return t+2;
   }
   if (*t=='\n') {
         cb->error=PARSE_OK;
         return t+1;
   }
   LM_ERR("expecting CSeq EoL\n");

error:
   LM_ERR("bad cseq\n");
   return t;
}


void free_cseq(struct cseq_body* cb)
{
   pkg_free(cb);
}