parse_contact.c

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/*
 * $Id: parse_contact.c 4518 2008-07-28 15:39:28Z henningw $
 *
 * Contact header field body parser
 *
 * 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:
 * -------
 *  2003-03-25 Adapted to use new parameter parser (janakj)
 */

#include <string.h>          /* memset */
#include "../hf.h"     
#include "../../mem/mem.h"   /* pkg_malloc, pkg_free */
#include "../../dprint.h"
#include "../../trim.h"      /* trim_leading */
#include "parse_contact.h"



static inline int contact_parser(char* _s, int _l, contact_body_t* _c)
{
   str tmp;

   tmp.s = _s;
   tmp.len = _l;

   trim_leading(&tmp);

   if (tmp.len == 0) {
      LM_ERR("empty body\n");
      return -1;
   }

   if (tmp.s[0] == '*') {
      _c->star = 1;
   } else {
      if (parse_contacts(&tmp, &(_c->contacts)) < 0) {
         LM_ERR("failed to parse contacts\n");
         return -2;
      }
   }

   return 0;
}


/*
 * Parse contact header field body
 */
int parse_contact(struct hdr_field* _h)
{
   contact_body_t* b;

   if (_h->parsed != 0) {
      return 0;  /* Already parsed */
   }

   b = (contact_body_t*)pkg_malloc(sizeof(contact_body_t));
   if (b == 0) {
      LM_ERR("no pkg memory left\n");
      return -1;
   }

   memset(b, 0, sizeof(contact_body_t));

   if (contact_parser(_h->body.s, _h->body.len, b) < 0) {
      LM_ERR("failed to parse contact\n");
      pkg_free(b);
      return -2;
   }

   _h->parsed = (void*)b;
   return 0;
}


/*
 * Free all memory
 */
void free_contact(contact_body_t** _c)
{
   if ((*_c)->contacts) {
      free_contacts(&((*_c)->contacts));
   }
   
   pkg_free(*_c);
   *_c = 0;
}


/*
 * Print structure, for debugging only
 */
void print_contact(FILE* _o, contact_body_t* _c)
{
   fprintf(_o, "===Contact body===\n");
   fprintf(_o, "star: %d\n", _c->star);
   print_contacts(_o, _c->contacts);
   fprintf(_o, "===/Contact body===\n");
}


/*
 * Contact header field iterator, returns next contact if any, it doesn't
 * parse message header if not absolutely necessary
 */
int contact_iterator(contact_t** c, struct sip_msg* msg, contact_t* prev)
{
   static struct hdr_field* hdr = 0;
   struct hdr_field* last;
   contact_body_t* cb;

   if (!msg) {
      LM_ERR("invalid parameter value\n");
      return -1;
   }

   if (!prev) {
           /* No pointer to previous contact given, find topmost
            * contact and return pointer to the first contact
            * inside that header field
            */
      hdr = msg->contact;
      if (!hdr) {
         if (parse_headers(msg, HDR_CONTACT_F, 0) == -1) {
            LM_ERR("failed to parse headers\n");
            return -1;
         }

         hdr = msg->contact;
      }

      if (hdr) {
         if (parse_contact(hdr) < 0) {
            LM_ERR("failed to parse Contact\n");
            return -1;
         }
      } else {
         *c = 0;
         return 1;
      }

      cb = (contact_body_t*)hdr->parsed;
      *c = cb->contacts;
      return 0;
   } else {
           /* Check if there is another contact in the
            * same header field and if so then return it
            */
      if (prev->next) {
         *c = prev->next;
         return 0;
      }

           /* Try to find and parse another Contact
            * header field
            */
      last = hdr;
      hdr = hdr->next;

           /* Search another already parsed Contact
            * header field
            */
      while(hdr && hdr->type != HDR_CONTACT_T) {
         hdr = hdr->next;
      }

      if (!hdr) {
              /* Look for another Contact HF in unparsed
               * part of the message header
               */
         if (parse_headers(msg, HDR_CONTACT_F, 1) == -1) {
            LM_ERR("failed to parse message header\n");
            return -1;
         }
         
              /* Check if last found header field is Contact
               * and if it is not the same header field as the
               * previous Contact HF (that indicates that the previous 
               * one was the last header field in the header)
               */
         if ((msg->last_header->type == HDR_CONTACT_T) &&
             (msg->last_header != last)) {
            hdr = msg->last_header;
         } else {
            *c = 0;
            return 1;
         }
      }
      
      if (parse_contact(hdr) < 0) {
         LM_ERR("failed to parse Contact HF body\n");
         return -1;
      }
      
           /* And return first contact within that
            * header field
            */
      cb = (contact_body_t*)hdr->parsed;
      *c = cb->contacts;
      return 0;
   }
}