ip_addr.c

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/*
 * $Id: ip_addr.c 4597 2008-08-06 11:04:06Z klaus_darilion $
 *
 * ip address & address family related functions
 *
 * 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
 *  2004-10-01  mk_net fixes bad network addresses now (andrei)
 */

/*!
 * \file
 * \brief Kamailio IP address & address family related functions
 */

#include <stdlib.h>
#include <stdio.h>

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


struct net* mk_net(struct ip_addr* ip, struct ip_addr* mask)
{
   struct net* n;
   int warning;
   unsigned int r;
   
   warning=0;
   if ((ip->af != mask->af) || (ip->len != mask->len)){
      LM_CRIT("trying to use a different mask family"
            " (eg. ipv4/ipv6mask or ipv6/ipv4mask)\n");
      goto error;
   }
   n=(struct net*)pkg_malloc(sizeof(struct net));
   if (n==0){ 
      LM_CRIT("memory allocation failure\n");
      goto error;
   }
   n->ip=*ip;
   n->mask=*mask;
   for (r=0; r<n->ip.len/4; r++) { /*ipv4 & ipv6 addresses are multiple of 4*/
      n->ip.u.addr32[r] &= n->mask.u.addr32[r];
      if (n->ip.u.addr32[r]!=ip->u.addr32[r]) warning=1;
   };
   if (warning){
      LM_WARN("invalid network address/netmask "
               "combination fixed...\n");
      print_ip("original network address:", ip, "/");
      print_ip("", mask, "\n");
      print_ip("fixed    network address:", &(n->ip), "/");
      print_ip("", &(n->mask), "\n");
   };
   return n;
error:
   return 0;
}



struct net* mk_net_bitlen(struct ip_addr* ip, unsigned int bitlen)
{
   struct ip_addr mask;
   unsigned int r;
   
   if (bitlen>ip->len*8){
      LM_CRIT("bad bitlen number %d\n", bitlen);
      goto error;
   }
   memset(&mask,0, sizeof(mask));
   for (r=0;r<bitlen/8;r++) mask.u.addr[r]=0xff;
   if (bitlen%8) mask.u.addr[r]=  ~((1<<(8-(bitlen%8)))-1);
   mask.af=ip->af;
   mask.len=ip->len;
   
   return mk_net(ip, &mask);
error:
   return 0;
}



void print_ip(char* p, struct ip_addr* ip, char *s)
{
   switch(ip->af){
      case AF_INET:
         LM_DBG("%s%d.%d.%d.%d%s", (p)?p:"",
                        ip->u.addr[0],
                        ip->u.addr[1],
                        ip->u.addr[2],
                        ip->u.addr[3],
                        (s)?s:""
                        );
         break;
      case AF_INET6:
         LM_DBG("%s%x:%x:%x:%x:%x:%x:%x:%x%s", (p)?p:"",
                                 htons(ip->u.addr16[0]),
                                 htons(ip->u.addr16[1]),
                                 htons(ip->u.addr16[2]),
                                 htons(ip->u.addr16[3]),
                                 htons(ip->u.addr16[4]),
                                 htons(ip->u.addr16[5]),
                                 htons(ip->u.addr16[6]),
                                 htons(ip->u.addr16[7]),
                                 (s)?s:""
            );
         break;
      default:
         LM_DBG("warning unknown address family %d\n", ip->af);
   }
}



void stdout_print_ip(struct ip_addr* ip)
{
   switch(ip->af){
      case AF_INET:
         printf("%d.%d.%d.%d",   ip->u.addr[0],
                        ip->u.addr[1],
                        ip->u.addr[2],
                        ip->u.addr[3]);
         break;
      case AF_INET6:
         printf("%x:%x:%x:%x:%x:%x:%x:%x",   htons(ip->u.addr16[0]),
                                 htons(ip->u.addr16[1]),
                                 htons(ip->u.addr16[2]),
                                 htons(ip->u.addr16[3]),
                                 htons(ip->u.addr16[4]),
                                 htons(ip->u.addr16[5]),
                                 htons(ip->u.addr16[6]),
                                 htons(ip->u.addr16[7])
            );
         break;
      default:
         LM_DBG("warning unknown address family %d\n", ip->af);
   }
}



void print_net(struct net* net)
{
   if (net==0){
      LM_WARN("null pointer\n");
      return;
   }
   print_ip("", &net->ip, "/"); print_ip("", &net->mask, "");
}


#ifdef USE_MCAST

/* Returns 1 if the given address is a multicast address */
int is_mcast(struct ip_addr* ip)
{
   if (!ip){
      LM_ERR("invalid parameter value\n");
      return -1;
   }

   if (ip->af==AF_INET){
      return IN_MULTICAST(htonl(ip->u.addr32[0]));
#ifdef USE_IPV6
   } else if (ip->af==AF_INET6){
      return IN6_IS_ADDR_MULTICAST((struct in6_addr *)ip->u.addr);
#endif /* USE_IPV6 */
   } else {
      LM_ERR("unsupported protocol family\n");
      return -1;
   }
}

#endif /* USE_MCAST */

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