name_alias.h

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/*
 * $Id: name_alias.h 4853 2008-09-04 17:41:48Z klaus_darilion $
 *
 * 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:
 * --------
 *  2003-03-19  replaced all mallocs/frees w/ pkg_malloc/pkg_free (andrei)
 *  2003-10-21  support for proto added: proto:host:port (andrei)
 */



#include "str.h"
#include "dprint.h"
#include "mem/mem.h"



struct host_alias{
   str alias;
   unsigned short port;
   unsigned short proto;
   struct host_alias* next;
};


extern struct host_alias* aliases;



/* returns 1 if  name is in the alias list; if port=0, port no is ignored
 * if proto=0, proto is ignored*/
static inline int grep_aliases(char* name, int len, unsigned short port,
                        unsigned short proto)
{
   struct  host_alias* a;
   
#ifdef USE_IPV6
   if ((len>2)&&((*name)=='[')&&(name[len-1]==']')){
      /* ipv6 reference, skip [] */
      name++;
      len-=2;
   }
#endif
   for(a=aliases;a;a=a->next) {
      LM_DBG("comparing host [%d:%.*s:%d] with us [%d:%.*s:%d]\n",
            proto, len, name, port, 
            a->proto, a->alias.len, a->alias.s, a->port);
      if ((a->alias.len==len) && ((a->port==0) || (port==0) || 
            (a->port==port)) && ((a->proto==0) || (proto==0) || 
            (a->proto==proto)) && (strncasecmp(a->alias.s, name, len)==0)) {
          LM_DBG("match found for: [%d:%.*s:%d]\n", proto, len, name, port);
         return 1;
      }
   }
    LM_DBG("no match for: [%d:%.*s:%d]\n", proto, len, name, port);
   return 0;
}



/* adds an alias to the list (only if it isn't already there)
 * if port==0, the alias will match all the ports
 * if proto==0, the alias will match all the protocols
 * returns 1 if a new alias was added, 0 if a matching alias was already on
 * the list and  -1 on error */
static inline int add_alias(char* name, int len, unsigned short port, 
                        unsigned short proto)
{
   struct host_alias* a;
   
   if ((port) && (proto)){
      /* don't add if there is already an alias matching it */
      if (grep_aliases(name,len, port, proto)) return 0;
   }else{
      /* don't add if already in the list with port or proto ==0*/
      for(a=aliases;a;a=a->next)
         if ((a->alias.len==len) && (a->port==port) && (a->proto==proto) &&
               (strncasecmp(a->alias.s, name, len)==0))
            return 0;
   }
   a=(struct host_alias*)pkg_malloc(sizeof(struct host_alias));
   if(a==0) goto error;
   a->alias.s=(char*)pkg_malloc(len+1);
   if (a->alias.s==0) goto error;
   a->alias.len=len;
   memcpy(a->alias.s, name, len);
   a->alias.s[len]=0; /* null terminate for easier printing*/
   a->port=port;
   a->proto=proto;
   a->next=aliases;
   aliases=a;
   return 1;
error:
   LM_ERR("pkg memory allocation error\n");
   if (a) pkg_free(a);
   return -1;
}

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