lookup.c

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/*
 * $Id: lookup.c 5143 2008-10-30 16:01:29Z henningw $
 *
 * Lookup contacts in usrloc
 *
 * 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:
 * ---------
 * 2003-03-12 added support for zombie state (nils)
 */
/*!
 * \file
 * \brief SIP registrar module - lookup contacts in usrloc
 * \ingroup registrar  
 */  


#include <string.h>
#include "../../ut.h"
#include "../../dset.h"
#include "../../str.h"
#include "../../config.h"
#include "../../action.h"
#include "../../parser/parse_rr.h"
#include "../usrloc/usrloc.h"
#include "common.h"
#include "regtime.h"
#include "reg_mod.h"
#include "lookup.h"


#define allowed_method(_msg, _c) \
   ( !method_filtering || ((_msg)->REQ_METHOD)&((_c)->methods) )


/*! \brief
 * Lookup contact in the database and rewrite Request-URI
 * \return: -1 : not found
 *          -2 : found but method not allowed
 *          -3 : error
 */
int lookup(struct sip_msg* _m, char* _t, char* _s)
{
   urecord_t* r;
   str aor, uri;
   ucontact_t* ptr;
   int res;
   int ret;
   str path_dst;

   if (_m->new_uri.s) uri = _m->new_uri;
   else uri = _m->first_line.u.request.uri;
   
   if (extract_aor(&uri, &aor) < 0) {
      LM_ERR("failed to extract address of record\n");
      return -3;
   }
   
   get_act_time();

   ul.lock_udomain((udomain_t*)_t, &aor);
   res = ul.get_urecord((udomain_t*)_t, &aor, &r);
   if (res > 0) {
      LM_DBG("'%.*s' Not found in usrloc\n", aor.len, ZSW(aor.s));
      ul.unlock_udomain((udomain_t*)_t, &aor);
      return -1;
   }

   ptr = r->contacts;
   ret = -1;
   /* look first for an un-expired and suported contact */
   while ( (ptr) &&
   !(VALID_CONTACT(ptr,act_time) && (ret=-2) && allowed_method(_m,ptr)))
      ptr = ptr->next;
   if (ptr==0) {
      /* nothing found */
      goto done;
   }

   ret = 1;
   if (ptr) {
      if (rewrite_uri(_m, &ptr->c) < 0) {
         LM_ERR("unable to rewrite Request-URI\n");
         ret = -3;
         goto done;
      }

      /* If a Path is present, use first path-uri in favour of
       * received-uri because in that case the last hop towards the uac
       * has to handle NAT. - agranig */
      if (ptr->path.s && ptr->path.len) {
         if (get_path_dst_uri(&ptr->path, &path_dst) < 0) {
            LM_ERR("failed to get dst_uri for Path\n");
            ret = -3;
            goto done;
         }
         if (set_path_vector(_m, &ptr->path) < 0) {
            LM_ERR("failed to set path vector\n");
            ret = -3;
            goto done;
         }
         if (set_dst_uri(_m, &path_dst) < 0) {
            LM_ERR("failed to set dst_uri of Path\n");
            ret = -3;
            goto done;
         }
      } else if (ptr->received.s && ptr->received.len) {
         if (set_dst_uri(_m, &ptr->received) < 0) {
            ret = -3;
            goto done;
         }
      }

      set_ruri_q(ptr->q);

      setbflag( 0, ptr->cflags);

      if (ptr->sock)
         _m->force_send_socket = ptr->sock;

      ptr = ptr->next;
   }

   /* Append branches if enabled */
   if (!append_branches) goto done;

   for( ; ptr ; ptr = ptr->next ) {
      if (VALID_CONTACT(ptr, act_time) && allowed_method(_m, ptr)) {
         path_dst.len = 0;
         if(ptr->path.s && ptr->path.len 
         && get_path_dst_uri(&ptr->path, &path_dst) < 0) {
            LM_ERR("failed to get dst_uri for Path\n");
            continue;
         }

         /* The same as for the first contact applies for branches 
          * regarding path vs. received. */
         if (append_branch(_m,&ptr->c,path_dst.len?&path_dst:&ptr->received,
         &ptr->path, ptr->q, ptr->cflags, ptr->sock) == -1) {
            LM_ERR("failed to append a branch\n");
            /* Also give a chance to the next branches*/
            continue;
         }
      }
   }

done:
   ul.release_urecord(r);
   ul.unlock_udomain((udomain_t*)_t, &aor);
   return ret;
}


/*! \brief the is_registered() function
 * Return true if the AOR in the Request-URI is registered,
 * it is similar to lookup but registered neither rewrites
 * the Request-URI nor appends branches
 */
int registered(struct sip_msg* _m, char* _t, char* _s)
{
   str uri, aor;
   urecord_t* r;
   ucontact_t* ptr;
   int res;

   if (_m->new_uri.s) uri = _m->new_uri;
   else uri = _m->first_line.u.request.uri;
   
   if (extract_aor(&uri, &aor) < 0) {
      LM_ERR("failed to extract address of record\n");
      return -1;
   }
   
   ul.lock_udomain((udomain_t*)_t, &aor);
   res = ul.get_urecord((udomain_t*)_t, &aor, &r);

   if (res < 0) {
      ul.unlock_udomain((udomain_t*)_t, &aor);
      LM_ERR("failed to query usrloc\n");
      return -1;
   }

   if (res == 0) {
      
      int_str match_callid;
      if (reg_callid_avp_name.n) {
         struct usr_avp *avp =
            search_first_avp( reg_callid_avp_type, reg_callid_avp_name, &match_callid, 0);
         if (!(avp && is_avp_str_val(avp)))
            match_callid=(int_str)0;
      }

      for (ptr = r->contacts; ptr; ptr = ptr->next) {
         if(!VALID_CONTACT(ptr, act_time)) continue;
         if (match_callid.s.s && /* optionally enforce tighter matching w/ Call-ID */
            memcmp(match_callid.s.s,ptr->callid.s,match_callid.s.len))
            continue;
         ul.release_urecord(r);
         ul.unlock_udomain((udomain_t*)_t, &aor);
         LM_DBG("'%.*s' found in usrloc\n", aor.len, ZSW(aor.s));
         return 1;
      }
   }

   ul.unlock_udomain((udomain_t*)_t, &aor);
   LM_DBG("'%.*s' not found in usrloc\n", aor.len, ZSW(aor.s));
   return -1;
}