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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 2016 Nexenta Systems, Inc.
*/
/*
* 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
*
* Return values:
*
* 0 mismatch
* 1 match
* -1 error occured, caller should check errno:
* EINVAL access list entry is invalid
* ENOMEM failed to allocate memory
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <strings.h>
int
inet_matchaddr(const void *sa, const char *name)
{
int ret = -1;
char *lname, *mp, *p;
char *ep;
int serrno = errno;
uint32_t claddr4 = 0;
if ((p = lname = strdup(name)) == NULL) {
errno = ENOMEM;
return (-1);
}
if ((mp = strchr(p, '/')) != NULL)
*mp++ = '\0';
switch (((struct sockaddr_in *)sa)->sin_family) {
case AF_INET6: {
char *pp;
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 != '[') {
errno = EINVAL;
break;
}
p++;
if ((pp = strchr(p, ']')) == NULL ||
(mp != NULL && pp != mp - 2) ||
(mp == NULL && *(pp + 1) != '\0')) {
errno = EINVAL;
break;
}
*pp = '\0';
if (inet_pton(AF_INET6, p, &hcaddr6) != 1) {
errno = EINVAL;
break;
}
if (mp != NULL) {
/* Match only first prefix bits */
long prefix6;
errno = 0;
prefix6 = strtol(mp, &ep, 10);
if (errno != 0 || prefix6 < 0 ||
prefix6 > 128 || *ep != '\0') {
errno = EINVAL;
break;
}
ret = IN6_ARE_PREFIXEDADDR_EQUAL(claddr6,
&hcaddr6, prefix6) ? 1 : 0;
break;
} else {
/* No prefix, exact match */
ret = IN6_ARE_ADDR_EQUAL(claddr6,
&hcaddr6) ? 1 : 0;
break;
}
} else {
/* IPv4-mapped IPv6 address, fallthrough to IPv4 */
IN6_V4MAPPED_TO_IPADDR(claddr6, ipaddr4);
claddr4 = ntohl(ipaddr4);
}
}
/*FALLTHROUGH*/
case AF_INET: {
int 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++) {
long qaddr4;
errno = 0;
qaddr4 = strtol(p, &ep, 10);
if (errno != 0 || qaddr4 < 0 || qaddr4 > 255 ||
(*ep != '.' && *ep != '\0')) {
errno = EINVAL;
break;
}
hcaddr4 |= qaddr4 << ((3 - i) * 8);
if (*ep == '\0')
break;
p = ep + 1;
}
if (errno != 0)
break;
if (mp != NULL) {
/* Mask is specified explicitly */
long mb;
errno = 0;
mb = strtol(mp, &ep, 10);
if (errno != 0 || mb < 0 || mb > 32 || *ep != '\0') {
errno = EINVAL;
break;
}
mask4 = mb ? ~0 << ((sizeof (struct in_addr) * NBBY)
- mb) : 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) ? 1 : 0;
break;
}
}
free(lname);
if (ret != -1)
errno = serrno;
return (ret);
}
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