[openssh.git] / addrmatch.c

/*	$OpenBSD: addrmatch.c,v 1.4 2008/12/10 03:55:20 stevesk Exp $ */

/*
 * Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

#include "match.h"
#include "log.h"
#include "xmalloc.h"

struct xaddr {
	sa_family_t	af;
	union {
		struct in_addr		v4;
		struct in6_addr		v6;
		u_int8_t		addr8[16];
		u_int32_t		addr32[4];
	} xa;		    /* 128-bit address */
	u_int32_t	scope_id;	/* iface scope id for v6 */
#define v4	xa.v4
#define v6	xa.v6
#define addr8	xa.addr8
#define addr32	xa.addr32
};

static int
addr_unicast_masklen(int af)
{
	switch (af) {
	case AF_INET:
		return 32;
	case AF_INET6:
		return 128;
	default:
		return -1;
	}
}

static inline int
masklen_valid(int af, u_int masklen)
{
	switch (af) {
	case AF_INET:
		return masklen <= 32 ? 0 : -1;
	case AF_INET6:
		return masklen <= 128 ? 0 : -1;
	default:
		return -1;
	}
}

/*
 * Convert struct sockaddr to struct xaddr
 * Returns 0 on success, -1 on failure.
 */
static int
addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
{
	struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
	struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;

	memset(xa, '\0', sizeof(*xa));

	switch (sa->sa_family) {
	case AF_INET:
		if (slen < sizeof(*in4))
			return -1;
		xa->af = AF_INET;
		memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
		break;
	case AF_INET6:
		if (slen < sizeof(*in6))
			return -1;
		xa->af = AF_INET6;
		memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
		xa->scope_id = in6->sin6_scope_id;
#endif
		break;
	default:
		return -1;
	}

	return 0;
}

/*
 * Calculate a netmask of length 'l' for address family 'af' and
 * store it in 'n'.
 * Returns 0 on success, -1 on failure.
 */
static int
addr_netmask(int af, u_int l, struct xaddr *n)
{
	int i;

	if (masklen_valid(af, l) != 0 || n == NULL)
		return -1;

	memset(n, '\0', sizeof(*n));
	switch (af) {
	case AF_INET:
		n->af = AF_INET;
		n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
		return 0;
	case AF_INET6:
		n->af = AF_INET6;
		for (i = 0; i < 4 && l >= 32; i++, l -= 32)
			n->addr32[i] = 0xffffffffU;
		if (i < 4 && l != 0)
			n->addr32[i] = htonl((0xffffffff << (32 - l)) &
			    0xffffffff);
		return 0;
	default:
		return -1;
	}
}

/*
 * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
 * Returns 0 on success, -1 on failure.
 */
static int
addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
{
	int i;

	if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
		return -1;

	memcpy(dst, a, sizeof(*dst));
	switch (a->af) {
	case AF_INET:
		dst->v4.s_addr &= b->v4.s_addr;
		return 0;
	case AF_INET6:
		dst->scope_id = a->scope_id;
		for (i = 0; i < 4; i++)
			dst->addr32[i] &= b->addr32[i];
		return 0;
	default:
		return -1;
	}
}

/*
 * Compare addresses 'a' and 'b'
 * Return 0 if addresses are identical, -1 if (a < b) or 1 if (a > b)
 */
static int
addr_cmp(const struct xaddr *a, const struct xaddr *b)
{
	int i;

	if (a->af != b->af)
		return a->af == AF_INET6 ? 1 : -1;

	switch (a->af) {
	case AF_INET:
		if (a->v4.s_addr == b->v4.s_addr)
			return 0;
		return ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1;
	case AF_INET6:
		for (i = 0; i < 16; i++)
			if (a->addr8[i] - b->addr8[i] != 0)
				return a->addr8[i] > b->addr8[i] ? 1 : -1;
		if (a->scope_id == b->scope_id)
			return 0;
		return a->scope_id > b->scope_id ? 1 : -1;
	default:
		return -1;
	}
}

/*
 * Parse string address 'p' into 'n'
 * Returns 0 on success, -1 on failure.
 */
static int
addr_pton(const char *p, struct xaddr *n)
{
	struct addrinfo hints, *ai;

	memset(&hints, '\0', sizeof(hints));
	hints.ai_flags = AI_NUMERICHOST;

	if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
		return -1;

	if (ai == NULL || ai->ai_addr == NULL)
		return -1;

	if (n != NULL &&
	    addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen, n) == -1) {
		freeaddrinfo(ai);
		return -1;
	}

	freeaddrinfo(ai);
	return 0;
}

/*
 * Perform bitwise negation of address
 * Returns 0 on success, -1 on failure.
 */
static int
addr_invert(struct xaddr *n)
{
	int i;

	if (n == NULL)
		return (-1);

	switch (n->af) {
	case AF_INET:
		n->v4.s_addr = ~n->v4.s_addr;
		return (0);
	case AF_INET6:
		for (i = 0; i < 4; i++)
			n->addr32[i] = ~n->addr32[i];
		return (0);
	default:
		return (-1);
	}
}

/*
 * Calculate a netmask of length 'l' for address family 'af' and
 * store it in 'n'.
 * Returns 0 on success, -1 on failure.
 */
static int
addr_hostmask(int af, u_int l, struct xaddr *n)
{
	if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
		return (-1);
	return (0);
}

/*
 * Test whether address 'a' is all zeros (i.e. 0.0.0.0 or ::)
 * Returns 0 on if address is all-zeros, -1 if not all zeros or on failure.
 */
static int
addr_is_all0s(const struct xaddr *a)
{
	int i;

	switch (a->af) {
	case AF_INET:
		return (a->v4.s_addr == 0 ? 0 : -1);
	case AF_INET6:;
		for (i = 0; i < 4; i++)
			if (a->addr32[i] != 0)
				return (-1);
		return (0);
	default:
		return (-1);
	}
}

/*
 * Test whether host portion of address 'a', as determined by 'masklen'
 * is all zeros.
 * Returns 0 on if host portion of address is all-zeros,
 * -1 if not all zeros or on failure.
 */
static int
addr_host_is_all0s(const struct xaddr *a, u_int masklen)
{
	struct xaddr tmp_addr, tmp_mask, tmp_result;

	memcpy(&tmp_addr, a, sizeof(tmp_addr));
	if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
		return (-1);
	if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
		return (-1);
	return (addr_is_all0s(&tmp_result));
}

/*
 * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
 * Return -1 on parse error, -2 on inconsistency or 0 on success.
 */
static int
addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
{
	struct xaddr tmp;
	long unsigned int masklen = 999;
	char addrbuf[64], *mp, *cp;

	/* Don't modify argument */
	if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) > sizeof(addrbuf))
		return -1;

	if ((mp = strchr(addrbuf, '/')) != NULL) {
		*mp = '\0';
		mp++;
		masklen = strtoul(mp, &cp, 10);
		if (*mp == '\0' || *cp != '\0' || masklen > 128)
			return -1;
	}

	if (addr_pton(addrbuf, &tmp) == -1)
		return -1;

	if (mp == NULL)
		masklen = addr_unicast_masklen(tmp.af);
	if (masklen_valid(tmp.af, masklen) == -1)
		return -2;
	if (addr_host_is_all0s(&tmp, masklen) != 0)
		return -2;

	if (n != NULL)
		memcpy(n, &tmp, sizeof(*n));
	if (l != NULL)
		*l = masklen;

	return 0;
}

static int
addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
{
	struct xaddr tmp_mask, tmp_result;

	if (host->af != net->af)
		return -1;

	if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
		return -1;
	if (addr_and(&tmp_result, host, &tmp_mask) == -1)
		return -1;
	return addr_cmp(&tmp_result, net);
}

/*
 * Match "addr" against list pattern list "_list", which may contain a
 * mix of CIDR addresses and old-school wildcards.
 *
 * If addr is NULL, then no matching is performed, but _list is parsed
 * and checked for well-formedness.
 *
 * Returns 1 on match found (never returned when addr == NULL).
 * Returns 0 on if no match found, or no errors found when addr == NULL.
 * Returns -1 on negated match found (never returned when addr == NULL).
 * Returns -2 on invalid list entry.
 */
int
addr_match_list(const char *addr, const char *_list)
{
	char *list, *cp, *o;
	struct xaddr try_addr, match_addr;
	u_int masklen, neg;
	int ret = 0, r;

	if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
		debug2("%s: couldn't parse address %.100s", __func__, addr);
		return 0;
	}
	if ((o = list = strdup(_list)) == NULL)
		return -1;
	while ((cp = strsep(&list, ",")) != NULL) {
		neg = *cp == '!';
		if (neg)
			cp++;
		if (*cp == '\0') {
			ret = -2;
			break;
		}
		/* Prefer CIDR address matching */
		r = addr_pton_cidr(cp, &match_addr, &masklen);
		if (r == -2) {
			error("Inconsistent mask length for "
			    "network \"%.100s\"", cp);
			ret = -2;
			break;
		} else if (r == 0) {
			if (addr != NULL && addr_netmatch(&try_addr,
                           &match_addr, masklen) == 0) {
 foundit:
				if (neg) {
					ret = -1;
					break;
				}
				ret = 1;
			}
			continue;
		} else {
			/* If CIDR parse failed, try wildcard string match */
			if (addr != NULL && match_pattern(addr, cp) == 1)
				goto foundit;
		}
	}
	xfree(o);

	return ret;
}
Commit	Line	Data
fd2ce9c6	1	/* $OpenBSD: addrmatch.c,v 1.4 2008/12/10 03:55:20 stevesk Exp $ */
15b5fa9b	2
	3	/*
	4	* Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org>
	5	*
	6	* Permission to use, copy, modify, and distribute this software for any
	7	* purpose with or without fee is hereby granted, provided that the above
	8	* copyright notice and this permission notice appear in all copies.
	9	*
	10	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	11	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	13	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	16	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	17	*/
	18
	19	#include "includes.h"
	20
	21	#include <sys/types.h>
	22	#include <sys/socket.h>
	23	#include <netinet/in.h>
	24	#include <arpa/inet.h>
	25
	26	#include <netdb.h>
	27	#include <string.h>
	28	#include <stdlib.h>
	29	#include <stdio.h>
	30	#include <stdarg.h>
	31
	32	#include "match.h"
	33	#include "log.h"
fd2ce9c6	34	#include "xmalloc.h"
15b5fa9b	35
	36	struct xaddr {
	37	sa_family_t af;
	38	union {
	39	struct in_addr v4;
	40	struct in6_addr v6;
	41	u_int8_t addr8[16];
	42	u_int32_t addr32[4];
	43	} xa; /* 128-bit address */
	44	u_int32_t scope_id; /* iface scope id for v6 */
	45	#define v4 xa.v4
	46	#define v6 xa.v6
	47	#define addr8 xa.addr8
	48	#define addr32 xa.addr32
	49	};
	50
	51	static int
	52	addr_unicast_masklen(int af)
	53	{
	54	switch (af) {
	55	case AF_INET:
	56	return 32;
	57	case AF_INET6:
	58	return 128;
	59	default:
	60	return -1;
	61	}
	62	}
	63
	64	static inline int
	65	masklen_valid(int af, u_int masklen)
	66	{
	67	switch (af) {
	68	case AF_INET:
	69	return masklen <= 32 ? 0 : -1;
	70	case AF_INET6:
	71	return masklen <= 128 ? 0 : -1;
	72	default:
	73	return -1;
	74	}
	75	}
	76
	77	/*
	78	* Convert struct sockaddr to struct xaddr
	79	* Returns 0 on success, -1 on failure.
	80	*/
	81	static int
	82	addr_sa_to_xaddr(struct sockaddr sa, socklen_t slen, struct xaddr xa)
	83	{
	84	struct sockaddr_in in4 = (struct sockaddr_in )sa;
	85	struct sockaddr_in6 in6 = (struct sockaddr_in6 )sa;
	86
	87	memset(xa, '\0', sizeof(*xa));
	88
	89	switch (sa->sa_family) {
	90	case AF_INET:
	91	if (slen < sizeof(*in4))
	92	return -1;
	93	xa->af = AF_INET;
	94	memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
	95	break;
	96	case AF_INET6:
	97	if (slen < sizeof(*in6))
	98	return -1;
99	xa->af = AF_INET6;
100	memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
95e16084	101	#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
15b5fa9b	102	xa->scope_id = in6->sin6_scope_id;
95e16084	103	#endif
15b5fa9b	104	break;
	105	default:
	106	return -1;
	107	}
	108
	109	return 0;
	110	}
	111
	112	/*
	113	* Calculate a netmask of length 'l' for address family 'af' and
	114	* store it in 'n'.
	115	* Returns 0 on success, -1 on failure.
	116	*/
	117	static int
	118	addr_netmask(int af, u_int l, struct xaddr *n)
	119	{
	120	int i;
	121
	122	if (masklen_valid(af, l) != 0 \|\| n == NULL)
	123	return -1;
	124
	125	memset(n, '\0', sizeof(*n));
	126	switch (af) {
	127	case AF_INET:
	128	n->af = AF_INET;
	129	n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
	130	return 0;
	131	case AF_INET6:
	132	n->af = AF_INET6;
	133	for (i = 0; i < 4 && l >= 32; i++, l -= 32)
	134	n->addr32[i] = 0xffffffffU;
	135	if (i < 4 && l != 0)
	136	n->addr32[i] = htonl((0xffffffff << (32 - l)) &
	137	0xffffffff);
	138	return 0;
	139	default:
	140	return -1;
	141	}
	142	}
	143
	144	/*
	145	* Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
	146	* Returns 0 on success, -1 on failure.
	147	*/
	148	static int
	149	addr_and(struct xaddr dst, const struct xaddr a, const struct xaddr *b)
	150	{
	151	int i;
	152
	153	if (dst == NULL \|\| a == NULL \|\| b == NULL \|\| a->af != b->af)
	154	return -1;
	155
	156	memcpy(dst, a, sizeof(*dst));
	157	switch (a->af) {
	158	case AF_INET:
	159	dst->v4.s_addr &= b->v4.s_addr;
	160	return 0;
	161	case AF_INET6:
	162	dst->scope_id = a->scope_id;
	163	for (i = 0; i < 4; i++)
	164	dst->addr32[i] &= b->addr32[i];
	165	return 0;
	166	default:
	167	return -1;
168	}
169	}
170
171	/*
172	* Compare addresses 'a' and 'b'
173	* Return 0 if addresses are identical, -1 if (a < b) or 1 if (a > b)
174	*/
175	static int
176	addr_cmp(const struct xaddr a, const struct xaddr b)
177	{
178	int i;
179
180	if (a->af != b->af)
181	return a->af == AF_INET6 ? 1 : -1;
182
183	switch (a->af) {
184	case AF_INET:
185	if (a->v4.s_addr == b->v4.s_addr)
186	return 0;
187	return ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1;
188	case AF_INET6:
189	for (i = 0; i < 16; i++)
190	if (a->addr8[i] - b->addr8[i] != 0)
191	return a->addr8[i] > b->addr8[i] ? 1 : -1;
192	if (a->scope_id == b->scope_id)
193	return 0;
194	return a->scope_id > b->scope_id ? 1 : -1;
195	default:
196	return -1;
197	}
198	}
199
200	/*
201	* Parse string address 'p' into 'n'
202	* Returns 0 on success, -1 on failure.
203	*/
204	static int
205	addr_pton(const char p, struct xaddr n)
206	{
207	struct addrinfo hints, *ai;
208
209	memset(&hints, '\0', sizeof(hints));
210	hints.ai_flags = AI_NUMERICHOST;
211
212	if (p == NULL \|\| getaddrinfo(p, NULL, &hints, &ai) != 0)
213	return -1;
214
215	if (ai == NULL \|\| ai->ai_addr == NULL)
216	return -1;
217
218	if (n != NULL &&
219	addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen, n) == -1) {
220	freeaddrinfo(ai);
221	return -1;
222	}
223
224	freeaddrinfo(ai);
225	return 0;
226	}
227
228	/*
229	* Perform bitwise negation of address
230	* Returns 0 on success, -1 on failure.
231	*/
232	static int
233	addr_invert(struct xaddr *n)
234	{
235	int i;
236
237	if (n == NULL)
238	return (-1);
239
240	switch (n->af) {
241	case AF_INET:
242	n->v4.s_addr = ~n->v4.s_addr;
243	return (0);
244	case AF_INET6:
245	for (i = 0; i < 4; i++)
246	n->addr32[i] = ~n->addr32[i];
247	return (0);
248	default:
249	return (-1);
250	}
251	}
252
253	/*
254	* Calculate a netmask of length 'l' for address family 'af' and
255	* store it in 'n'.
256	* Returns 0 on success, -1 on failure.
257	*/
258	static int
259	addr_hostmask(int af, u_int l, struct xaddr *n)
260	{
261	if (addr_netmask(af, l, n) == -1 \|\| addr_invert(n) == -1)
262	return (-1);
263	return (0);
264	}
265
266	/*
267	* Test whether address 'a' is all zeros (i.e. 0.0.0.0 or ::)
268	* Returns 0 on if address is all-zeros, -1 if not all zeros or on failure.
269	*/
270	static int
271	addr_is_all0s(const struct xaddr *a)
272	{
273	int i;
274
275	switch (a->af) {
276	case AF_INET:
277	return (a->v4.s_addr == 0 ? 0 : -1);
278	case AF_INET6:;
279	for (i = 0; i < 4; i++)
280	if (a->addr32[i] != 0)
281	return (-1);
282	return (0);
283	default:
284	return (-1);
285	}
286	}
287
288	/*
289	* Test whether host portion of address 'a', as determined by 'masklen'
290	* is all zeros.
291	* Returns 0 on if host portion of address is all-zeros,
292	* -1 if not all zeros or on failure.
293	*/
294	static int
295	addr_host_is_all0s(const struct xaddr *a, u_int masklen)
296	{
297	struct xaddr tmp_addr, tmp_mask, tmp_result;
298
299	memcpy(&tmp_addr, a, sizeof(tmp_addr));
300	if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
301	return (-1);
302	if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
303	return (-1);
304	return (addr_is_all0s(&tmp_result));
305	}
306
307	/*
308	* Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
309	* Return -1 on parse error, -2 on inconsistency or 0 on success.
310	*/
311	static int
312	addr_pton_cidr(const char p, struct xaddr n, u_int *l)
313	{
314	struct xaddr tmp;
315	long unsigned int masklen = 999;
316	char addrbuf[64], mp, cp;
317
318	/* Don't modify argument */
319	if (p == NULL \|\| strlcpy(addrbuf, p, sizeof(addrbuf)) > sizeof(addrbuf))
320	return -1;
321
322	if ((mp = strchr(addrbuf, '/')) != NULL) {
323	*mp = '\0';
324	mp++;
325	masklen = strtoul(mp, &cp, 10);
326	if (mp == '\0' \|\| cp != '\0' \|\| masklen > 128)
327	return -1;
328	}
329
330	if (addr_pton(addrbuf, &tmp) == -1)
331	return -1;
332
333	if (mp == NULL)
334	masklen = addr_unicast_masklen(tmp.af);
335	if (masklen_valid(tmp.af, masklen) == -1)
336	return -2;
337	if (addr_host_is_all0s(&tmp, masklen) != 0)
338	return -2;
339
340	if (n != NULL)
341	memcpy(n, &tmp, sizeof(*n));
342	if (l != NULL)
343	*l = masklen;
344
345	return 0;
346	}
347
348	static int
349	addr_netmatch(const struct xaddr host, const struct xaddr net, u_int masklen)
350	{
351	struct xaddr tmp_mask, tmp_result;
352
353	if (host->af != net->af)
354	return -1;
355
356	if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
357	return -1;
358	if (addr_and(&tmp_result, host, &tmp_mask) == -1)
359	return -1;
360	return addr_cmp(&tmp_result, net);
361	}
362
363	/*
364	* Match "addr" against list pattern list "_list", which may contain a
365	* mix of CIDR addresses and old-school wildcards.
366	*
367	* If addr is NULL, then no matching is performed, but _list is parsed
368	* and checked for well-formedness.
369	*
370	* Returns 1 on match found (never returned when addr == NULL).
371	* Returns 0 on if no match found, or no errors found when addr == NULL.
b3b048d6	372	* Returns -1 on negated match found (never returned when addr == NULL).
b3b048d6	373	* Returns -2 on invalid list entry.
15b5fa9b	374	*/
	375	int
	376	addr_match_list(const char addr, const char _list)
	377	{
	378	char list, cp, *o;
	379	struct xaddr try_addr, match_addr;
	380	u_int masklen, neg;
	381	int ret = 0, r;
	382
	383	if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
	384	debug2("%s: couldn't parse address %.100s", __func__, addr);
	385	return 0;
	386	}
	387	if ((o = list = strdup(_list)) == NULL)
	388	return -1;
	389	while ((cp = strsep(&list, ",")) != NULL) {
	390	neg = *cp == '!';
	391	if (neg)
	392	cp++;
	393	if (*cp == '\0') {
b3b048d6	394	ret = -2;
15b5fa9b	395	break;
	396	}
	397	/* Prefer CIDR address matching */
	398	r = addr_pton_cidr(cp, &match_addr, &masklen);
	399	if (r == -2) {
	400	error("Inconsistent mask length for "
	401	"network \"%.100s\"", cp);
b3b048d6	402	ret = -2;
15b5fa9b	403	break;
	404	} else if (r == 0) {
	405	if (addr != NULL && addr_netmatch(&try_addr,
	406	&match_addr, masklen) == 0) {
	407	foundit:
	408	if (neg) {
b3b048d6	409	ret = -1;
15b5fa9b	410	break;
	411	}
	412	ret = 1;
	413	}
	414	continue;
	415	} else {
	416	/* If CIDR parse failed, try wildcard string match */
	417	if (addr != NULL && match_pattern(addr, cp) == 1)
	418	goto foundit;
	419	}
	420	}
fd2ce9c6	421	xfree(o);
15b5fa9b	422
	423	return ret;
	424	}