[openssh.git] / addrmatch.c

/*	$OpenBSD: addrmatch.c,v 1.3 2008/06/10 23:06:19 djm 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"

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;
		}
	}
	free(o);

	return ret;
}
Commit	Line	Data
b3b048d6	1	/* $OpenBSD: addrmatch.c,v 1.3 2008/06/10 23:06:19 djm 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"
	34
	35	struct xaddr {
	36	sa_family_t af;
	37	union {
	38	struct in_addr v4;
	39	struct in6_addr v6;
	40	u_int8_t addr8[16];
	41	u_int32_t addr32[4];
	42	} xa; /* 128-bit address */
	43	u_int32_t scope_id; /* iface scope id for v6 */
	44	#define v4 xa.v4
	45	#define v6 xa.v6
	46	#define addr8 xa.addr8
	47	#define addr32 xa.addr32
	48	};
	49
	50	static int
	51	addr_unicast_masklen(int af)
	52	{
	53	switch (af) {
	54	case AF_INET:
	55	return 32;
	56	case AF_INET6:
	57	return 128;
	58	default:
	59	return -1;
	60	}
	61	}
	62
	63	static inline int
	64	masklen_valid(int af, u_int masklen)
	65	{
66	switch (af) {
67	case AF_INET:
68	return masklen <= 32 ? 0 : -1;
69	case AF_INET6:
70	return masklen <= 128 ? 0 : -1;
71	default:
72	return -1;
73	}
74	}
75
76	/*
77	* Convert struct sockaddr to struct xaddr
78	* Returns 0 on success, -1 on failure.
79	*/
80	static int
81	addr_sa_to_xaddr(struct sockaddr sa, socklen_t slen, struct xaddr xa)
82	{
83	struct sockaddr_in in4 = (struct sockaddr_in )sa;
84	struct sockaddr_in6 in6 = (struct sockaddr_in6 )sa;
85
86	memset(xa, '\0', sizeof(*xa));
87
88	switch (sa->sa_family) {
89	case AF_INET:
90	if (slen < sizeof(*in4))
91	return -1;
92	xa->af = AF_INET;
93	memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
94	break;
95	case AF_INET6:
96	if (slen < sizeof(*in6))
97	return -1;
98	xa->af = AF_INET6;
99	memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
95e16084	100	#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
15b5fa9b	101	xa->scope_id = in6->sin6_scope_id;
95e16084	102	#endif
15b5fa9b	103	break;
	104	default:
	105	return -1;
	106	}
	107
	108	return 0;
	109	}
	110
	111	/*
	112	* Calculate a netmask of length 'l' for address family 'af' and
	113	* store it in 'n'.
	114	* Returns 0 on success, -1 on failure.
	115	*/
	116	static int
	117	addr_netmask(int af, u_int l, struct xaddr *n)
	118	{
	119	int i;
	120
	121	if (masklen_valid(af, l) != 0 \|\| n == NULL)
	122	return -1;
	123
	124	memset(n, '\0', sizeof(*n));
	125	switch (af) {
	126	case AF_INET:
	127	n->af = AF_INET;
	128	n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
	129	return 0;
	130	case AF_INET6:
	131	n->af = AF_INET6;
	132	for (i = 0; i < 4 && l >= 32; i++, l -= 32)
	133	n->addr32[i] = 0xffffffffU;
	134	if (i < 4 && l != 0)
	135	n->addr32[i] = htonl((0xffffffff << (32 - l)) &
	136	0xffffffff);
	137	return 0;
	138	default:
	139	return -1;
	140	}
	141	}
	142
	143	/*
	144	* Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
	145	* Returns 0 on success, -1 on failure.
	146	*/
	147	static int
	148	addr_and(struct xaddr dst, const struct xaddr a, const struct xaddr *b)
	149	{
	150	int i;
	151
	152	if (dst == NULL \|\| a == NULL \|\| b == NULL \|\| a->af != b->af)
	153	return -1;
	154
	155	memcpy(dst, a, sizeof(*dst));
	156	switch (a->af) {
	157	case AF_INET:
	158	dst->v4.s_addr &= b->v4.s_addr;
	159	return 0;
	160	case AF_INET6:
	161	dst->scope_id = a->scope_id;
	162	for (i = 0; i < 4; i++)
	163	dst->addr32[i] &= b->addr32[i];
	164	return 0;
	165	default:
	166	return -1;
167	}
168	}
169
170	/*
171	* Compare addresses 'a' and 'b'
172	* Return 0 if addresses are identical, -1 if (a < b) or 1 if (a > b)
173	*/
174	static int
175	addr_cmp(const struct xaddr a, const struct xaddr b)
176	{
177	int i;
178
179	if (a->af != b->af)
180	return a->af == AF_INET6 ? 1 : -1;
181
182	switch (a->af) {
183	case AF_INET:
184	if (a->v4.s_addr == b->v4.s_addr)
185	return 0;
186	return ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1;
187	case AF_INET6:
188	for (i = 0; i < 16; i++)
189	if (a->addr8[i] - b->addr8[i] != 0)
190	return a->addr8[i] > b->addr8[i] ? 1 : -1;
191	if (a->scope_id == b->scope_id)
192	return 0;
193	return a->scope_id > b->scope_id ? 1 : -1;
194	default:
195	return -1;
196	}
197	}
198
199	/*
200	* Parse string address 'p' into 'n'
201	* Returns 0 on success, -1 on failure.
202	*/
203	static int
204	addr_pton(const char p, struct xaddr n)
205	{
206	struct addrinfo hints, *ai;
207
208	memset(&hints, '\0', sizeof(hints));
209	hints.ai_flags = AI_NUMERICHOST;
210
211	if (p == NULL \|\| getaddrinfo(p, NULL, &hints, &ai) != 0)
212	return -1;
213
214	if (ai == NULL \|\| ai->ai_addr == NULL)
215	return -1;
216
217	if (n != NULL &&
218	addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen, n) == -1) {
219	freeaddrinfo(ai);
220	return -1;
221	}
222
223	freeaddrinfo(ai);
224	return 0;
225	}
226
227	/*
228	* Perform bitwise negation of address
229	* Returns 0 on success, -1 on failure.
230	*/
231	static int
232	addr_invert(struct xaddr *n)
233	{
234	int i;
235
236	if (n == NULL)
237	return (-1);
238
239	switch (n->af) {
240	case AF_INET:
241	n->v4.s_addr = ~n->v4.s_addr;
242	return (0);
243	case AF_INET6:
244	for (i = 0; i < 4; i++)
245	n->addr32[i] = ~n->addr32[i];
246	return (0);
247	default:
248	return (-1);
249	}
250	}
251
252	/*
253	* Calculate a netmask of length 'l' for address family 'af' and
254	* store it in 'n'.
255	* Returns 0 on success, -1 on failure.
256	*/
257	static int
258	addr_hostmask(int af, u_int l, struct xaddr *n)
259	{
260	if (addr_netmask(af, l, n) == -1 \|\| addr_invert(n) == -1)
261	return (-1);
262	return (0);
263	}
264
265	/*
266	* Test whether address 'a' is all zeros (i.e. 0.0.0.0 or ::)
267	* Returns 0 on if address is all-zeros, -1 if not all zeros or on failure.
268	*/
269	static int
270	addr_is_all0s(const struct xaddr *a)
271	{
272	int i;
273
274	switch (a->af) {
275	case AF_INET:
276	return (a->v4.s_addr == 0 ? 0 : -1);
277	case AF_INET6:;
278	for (i = 0; i < 4; i++)
279	if (a->addr32[i] != 0)
280	return (-1);
281	return (0);
282	default:
283	return (-1);
284	}
285	}
286
287	/*
288	* Test whether host portion of address 'a', as determined by 'masklen'
289	* is all zeros.
290	* Returns 0 on if host portion of address is all-zeros,
291	* -1 if not all zeros or on failure.
292	*/
293	static int
294	addr_host_is_all0s(const struct xaddr *a, u_int masklen)
295	{
296	struct xaddr tmp_addr, tmp_mask, tmp_result;
297
298	memcpy(&tmp_addr, a, sizeof(tmp_addr));
299	if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
300	return (-1);
301	if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
302	return (-1);
303	return (addr_is_all0s(&tmp_result));
304	}
305
306	/*
307	* Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
308	* Return -1 on parse error, -2 on inconsistency or 0 on success.
309	*/
310	static int
311	addr_pton_cidr(const char p, struct xaddr n, u_int *l)
312	{
313	struct xaddr tmp;
314	long unsigned int masklen = 999;
315	char addrbuf[64], mp, cp;
316
317	/* Don't modify argument */
318	if (p == NULL \|\| strlcpy(addrbuf, p, sizeof(addrbuf)) > sizeof(addrbuf))
319	return -1;
320
321	if ((mp = strchr(addrbuf, '/')) != NULL) {
322	*mp = '\0';
323	mp++;
324	masklen = strtoul(mp, &cp, 10);
325	if (mp == '\0' \|\| cp != '\0' \|\| masklen > 128)
326	return -1;
327	}
328
329	if (addr_pton(addrbuf, &tmp) == -1)
330	return -1;
331
332	if (mp == NULL)
333	masklen = addr_unicast_masklen(tmp.af);
334	if (masklen_valid(tmp.af, masklen) == -1)
335	return -2;
336	if (addr_host_is_all0s(&tmp, masklen) != 0)
337	return -2;
338
339	if (n != NULL)
340	memcpy(n, &tmp, sizeof(*n));
341	if (l != NULL)
342	*l = masklen;
343
344	return 0;
345	}
346
347	static int
348	addr_netmatch(const struct xaddr host, const struct xaddr net, u_int masklen)
349	{
350	struct xaddr tmp_mask, tmp_result;
351
352	if (host->af != net->af)
353	return -1;
354
355	if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
356	return -1;
357	if (addr_and(&tmp_result, host, &tmp_mask) == -1)
358	return -1;
359	return addr_cmp(&tmp_result, net);
360	}
361
362	/*
363	* Match "addr" against list pattern list "_list", which may contain a
364	* mix of CIDR addresses and old-school wildcards.
365	*
366	* If addr is NULL, then no matching is performed, but _list is parsed
367	* and checked for well-formedness.
368	*
369	* Returns 1 on match found (never returned when addr == NULL).
370	* Returns 0 on if no match found, or no errors found when addr == NULL.
b3b048d6	371	* Returns -1 on negated match found (never returned when addr == NULL).
b3b048d6	372	* Returns -2 on invalid list entry.
15b5fa9b	373	*/
	374	int
	375	addr_match_list(const char addr, const char _list)
	376	{
	377	char list, cp, *o;
	378	struct xaddr try_addr, match_addr;
	379	u_int masklen, neg;
	380	int ret = 0, r;
	381
	382	if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
	383	debug2("%s: couldn't parse address %.100s", __func__, addr);
	384	return 0;
	385	}
	386	if ((o = list = strdup(_list)) == NULL)
	387	return -1;
	388	while ((cp = strsep(&list, ",")) != NULL) {
	389	neg = *cp == '!';
	390	if (neg)
	391	cp++;
	392	if (*cp == '\0') {
b3b048d6	393	ret = -2;
15b5fa9b	394	break;
	395	}
	396	/* Prefer CIDR address matching */
	397	r = addr_pton_cidr(cp, &match_addr, &masklen);
	398	if (r == -2) {
	399	error("Inconsistent mask length for "
	400	"network \"%.100s\"", cp);
b3b048d6	401	ret = -2;
15b5fa9b	402	break;
	403	} else if (r == 0) {
	404	if (addr != NULL && addr_netmatch(&try_addr,
	405	&match_addr, masklen) == 0) {
	406	foundit:
	407	if (neg) {
b3b048d6	408	ret = -1;
15b5fa9b	409	break;
	410	}
	411	ret = 1;
	412	}
	413	continue;
	414	} else {
	415	/* If CIDR parse failed, try wildcard string match */
	416	if (addr != NULL && match_pattern(addr, cp) == 1)
	417	goto foundit;
	418	}
	419	}
	420	free(o);
	421
	422	return ret;
	423	}