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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* inet_matchaddr
*
* Match IPv4 or IPv6 address provided in sa (sockaddr_in/sockaddr_in6)
* against standard text representation specified in name:
*
* IPv4:
* IPv4
* IPv4/netmask
*
* IPv6:
* [IPv6]
* [IPv6]/prefix
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <stdlib.h>
#include <strings.h>
boolean_t
inet_matchaddr(const void *sa, const char *name)
{
boolean_t ret = B_FALSE;
char *lname, *mp, *p;
uint32_t claddr4 = 0;
if ((p = lname = strdup(name)) == NULL)
err(1, "strdup");
if ((mp = strchr(p, '/')) != NULL)
*mp++ = '\0';
switch (((struct sockaddr_in *)sa)->sin_family) {
case AF_INET6: {
char *pp;
int prefix6;
ipaddr_t ipaddr4;
struct in6_addr hcaddr6;
struct in6_addr *claddr6 =
&((struct sockaddr_in6 *)sa)->sin6_addr;
if (!IN6_IS_ADDR_V4MAPPED(claddr6)) {
/* IPv6 address */
if ((p = strchr(p, '[')) == NULL)
break;
p++;
if ((pp = strchr(p, ']')) == NULL)
break;
*pp = '\0';
if (inet_pton(AF_INET6, p, &hcaddr6) != 1)
break;
if (mp != NULL) {
/* Match only first prefix bits */
if ((prefix6 = (int)strtol(mp,
(char **)NULL, 10)) == 0)
break;
ret = IN6_ARE_PREFIXEDADDR_EQUAL(claddr6,
&hcaddr6, prefix6);
break;
} else {
/* No prefix, exact match */
ret = IN6_ARE_ADDR_EQUAL(claddr6, &hcaddr6);
break;
}
} else {
/* IPv4-mapped IPv6 address, fallthrough to IPv4 */
IN6_V4MAPPED_TO_IPADDR(claddr6, ipaddr4);
claddr4 = ntohl(ipaddr4);
}
/*FALLTHROUGH*/
}
case AF_INET: {
int bits, i;
uint32_t hcaddr4 = 0, mask4;
if (claddr4 == 0)
claddr4 = ntohl(
((struct sockaddr_in *)sa)->sin_addr.s_addr);
for (i = 0; i < 4; i++) {
hcaddr4 |= (int)strtol(p, (char **)NULL, 10) <<
((3 - i) * 8);
if ((p = strchr(p, '.')) == NULL)
break;
p++;
}
if (hcaddr4 == 0)
break;
if (mp != NULL) {
/* Mask is specified explicitly */
if ((bits = (int)strtol(mp, (char **)NULL, 10)) == 0)
break;
mask4 = bits ? ~0 << ((sizeof (struct in_addr) * NBBY)
- bits) : 0;
hcaddr4 &= mask4;
} else {
/*
* Use old-fashioned implicit netmasking by checking
* for lower-end zeroes. On the off chance we don't
* match any well-known prefixes, return an exact-
* match prefix which is misleadingly labelled as
* IN_CLASSE_NET.
*/
if ((hcaddr4 & IN_CLASSA_HOST) == 0)
mask4 = IN_CLASSA_NET;
else if ((hcaddr4 & IN_CLASSB_HOST) == 0)
mask4 = IN_CLASSB_NET;
else if ((hcaddr4 & IN_CLASSC_HOST) == 0)
mask4 = IN_CLASSC_NET;
else
mask4 = IN_CLASSE_NET;
}
ret = ((claddr4 & mask4) == hcaddr4);
break;
}
}
free(lname);
return (ret);
}
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