ip_addr.c
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 /*
  * $Id$
  *
  *
  * ip address & address family related functions
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  *
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  * Copyright (C) 2001-2003 FhG Fokus
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  *
  * This file is part of ser, a free SIP server.
  *
  * ser 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
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser 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
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  */
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 /*
  * History:
  * --------
  *  2003-03-19  replaced all mallocs/frees w/ pkg_malloc/pkg_free
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  *  2004-10-01  mk_net fixes bad network addresses now (andrei)
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  */
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 /** inernal ip addresses representation functions.
  * @file ip_addr.c
  * @ingroup core
  * Module: @ref core
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  */
 
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 #include <stdlib.h>
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 #include <stdio.h>
 
 #include "ip_addr.h"
 #include "dprint.h"
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 #include "mem/mem.h"
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 #include "resolve.h"
 #include "trim.h"
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 struct net* mk_new_net(struct ip_addr* ip, struct ip_addr* mask)
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 {
 	struct net* n;
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 	int warning;
 	int r;
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 	warning=0;
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 	if ((ip->af != mask->af) || (ip->len != mask->len)){
 		LOG(L_CRIT, "ERROR: mk_net: trying to use a different mask family"
 				" (eg. ipv4/ipv6mask or ipv6/ipv4mask)\n");
 		goto error;
 	}
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 	n=(struct net*)pkg_malloc(sizeof(struct net));
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 	if (n==0){ 
 		LOG(L_CRIT, "ERROR: mk_net: memory allocation failure\n");
 		goto error;
 	}
 	n->ip=*ip;
 	n->mask=*mask;
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 	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){
 		LOG(L_WARN, "WARNING: mk_net: 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");
 	};
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 	return n;
 error:
 	return 0;
 }
 
 
 
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 struct net* mk_new_net_bitlen(struct ip_addr* ip, unsigned int bitlen)
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 {
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 	struct ip_addr mask;
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 	int r;
 	
 	if (bitlen>ip->len*8){
 		LOG(L_CRIT, "ERROR: mk_net_bitlen: bad bitlen number %d\n", bitlen);
 		goto error;
 	}
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 	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;
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 	return mk_new_net(ip, &mask);
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 error:
 	return 0;
 }
 
 
 
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 /** fills a net structure from an ip and a mask.
  *
  * This function will not print any error messages or allocate
  * memory (as opposed to mk_new_net() above).
  *
  * @param n - destination net structure
  * @param ip
  * @param mask
  * @return -1 on error (af mismatch), 0 on success
  */
 int mk_net(struct net* n, struct ip_addr* ip, struct ip_addr* mask)
 {
 	int r;
 	
 	if (unlikely((ip->af != mask->af) || (ip->len != mask->len))) {
 		return -1;
 	}
 	n->ip=*ip;
 	n->mask=*mask;
 	/* fix the network part of the 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];
 	};
 	return 0;
 }
 
 
 
 /** fills a net structure from an ip and a bitlen.
  *
  * This function will not print any error messages or allocate
  * memory (as opposed to mk_new_net_bitlen() above).
  *
  * @param n - destination net structure
  * @param ip
  * @param bitlen
  * @return -1 on error (af mismatch), 0 on success
  */
 int mk_net_bitlen(struct net* n, struct ip_addr* ip, unsigned int bitlen)
 {
 	struct ip_addr mask;
 	int r;
 	
 	if (unlikely(bitlen>ip->len*8))
 		/* bitlen too big */
 		return -1;
 	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(n, ip, &mask);
 }
 
 
 
 /** initializes a net structure from a string.
  * @param dst - net structure that will be filled
  * @param s - string of the form "ip", "ip/mask_len" or "ip/ip_mak".
  * @return -1 on error, 0 on succes
  */
 int mk_net_str(struct net* dst, str* s)
 {
 	struct ip_addr* t;
 	char* p;
 	struct ip_addr ip;
 	str addr;
 	str mask;
 	unsigned int bitlen;
 	
 	/* test for ip only */
 	t = str2ip(s);
 #ifdef USE_IPV6
 	if (unlikely(t == 0))
 		t = str2ip6(s);
 #endif /* USE_IPV6 */
 	if (likely(t))
 		return mk_net_bitlen(dst, t, t->len*8);
 	/* not a simple ip, maybe an ip/netmask pair */
 	p = q_memchr(s->s, '/', s->len);
 	if (likely(p)) {
 		addr.s = s->s;
 		addr.len = (int)(long)(p - s->s);
 		mask.s = p + 1;
 		mask.len = s->len - (addr.len + 1);
 		/* allow '/' enclosed by whitespace */
 		trim_trailing(&addr);
 		trim_leading(&mask);
 		t = str2ip(&addr);
 		if (likely(t)) {
 			/* it can be a number */
 			if (str2int(&mask, &bitlen) == 0)
 				return mk_net_bitlen(dst, t, bitlen);
 			ip = *t;
 			t = str2ip(&mask);
 			if (likely(t))
 				return mk_net(dst, &ip, t);
 			/* error */
 			return -1;
 		}
 #ifdef USE_IPV6
 		else {
 			t = str2ip6(&addr);
 			if (likely(t)) {
 				/* it can be a number */
 				if (str2int(&mask, &bitlen) == 0)
 					return mk_net_bitlen(dst, t, bitlen);
 				ip = *t;
 				t = str2ip6(&mask);
 				if (likely(t))
 					return mk_net(dst, &ip, t);
 				/* error */
 				return -1;
 			}
 		}
 #endif /* USE_IPV6 */
 	}
 	return -1;
 }
 
 
 
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 void print_ip(char* p, struct ip_addr* ip, char *s)
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 {
 	switch(ip->af){
 		case AF_INET:
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 			DBG("%s%d.%d.%d.%d%s", (p)?p:"",
 								ip->u.addr[0],
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 								ip->u.addr[1],
 								ip->u.addr[2],
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 								ip->u.addr[3],
 								(s)?s:""
 								);
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 			break;
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 #ifdef USE_IPV6
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 		case AF_INET6:
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 			DBG("%s%x:%x:%x:%x:%x:%x:%x:%x%s", (p)?p:"",
 											htons(ip->u.addr16[0]),
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 											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]),
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 											htons(ip->u.addr16[7]),
 											(s)?s:""
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 				);
 			break;
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 #endif /* USE_IPV6 */
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 		default:
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 			DBG("print_ip: warning unknown address family %d\n", ip->af);
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 	}
 }
 
 
 
 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;
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 #ifdef USE_IPV6
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 		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;
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 #endif /* USE_IPV6 */
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 		default:
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 			DBG("print_ip: warning unknown address family %d\n", ip->af);
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 	}
 }
 
 
 
 void print_net(struct net* net)
 {
 	if (net==0){
 		LOG(L_WARN, "ERROR: print net: null pointer\n");
 		return;
 	}
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 	print_ip("", &net->ip, "/"); print_ip("", &net->mask, "");
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 }
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 #ifdef USE_MCAST
 
 /* Returns 1 if the given address is a multicast address */
 int is_mcast(struct ip_addr* ip)
 {
 	if (!ip){
 		LOG(L_ERR, "ERROR: is_mcast: 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){
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 		return IN6_IS_ADDR_MULTICAST((struct in6_addr*)ip->u.addr32);
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 #endif /* USE_IPV6 */
 	} else {
 		LOG(L_ERR, "ERROR: is_mcast: Unsupported protocol family\n");
 		return -1;
 	}
 }
 
 #endif /* USE_MCAST */
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 /** get protocol name (asciiz).
  * @param proto - protocol number
  * @return  string with the protocol name or "unknown".
  */
 char* proto2a(enum sip_protos proto)
 {
 	switch(proto){
 		case PROTO_NONE:
 			return "*";
 		case PROTO_UDP:
 			return "udp";
 		case PROTO_TCP:
 			return "tcp";
 		case PROTO_TLS:
 			return "tls";
 		case PROTO_SCTP:
 			return "sctp";
 	}
 	return "unknown";
 }