[gssapi-openssh.git] / openssh / 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));
		xa->scope_id = in6->sin6_scope_id;
		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
602aedb1	1	/* $OpenBSD: addrmatch.c,v 1.3 2008/06/10 23:06:19 djm Exp $ */
	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));
100	xa->scope_id = in6->sin6_scope_id;
101	break;
102	default:
103	return -1;
104	}
105
106	return 0;
107	}
108
109	/*
110	* Calculate a netmask of length 'l' for address family 'af' and
111	* store it in 'n'.
112	* Returns 0 on success, -1 on failure.
113	*/
114	static int
115	addr_netmask(int af, u_int l, struct xaddr *n)
116	{
117	int i;
118
119	if (masklen_valid(af, l) != 0 \|\| n == NULL)
120	return -1;
121
122	memset(n, '\0', sizeof(*n));
123	switch (af) {
124	case AF_INET:
125	n->af = AF_INET;
126	n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
127	return 0;
128	case AF_INET6:
129	n->af = AF_INET6;
130	for (i = 0; i < 4 && l >= 32; i++, l -= 32)
131	n->addr32[i] = 0xffffffffU;
132	if (i < 4 && l != 0)
133	n->addr32[i] = htonl((0xffffffff << (32 - l)) &
134	0xffffffff);
135	return 0;
136	default:
137	return -1;
138	}
139	}
140
141	/*
142	* Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
143	* Returns 0 on success, -1 on failure.
144	*/
145	static int
146	addr_and(struct xaddr dst, const struct xaddr a, const struct xaddr *b)
147	{
148	int i;
149
150	if (dst == NULL \|\| a == NULL \|\| b == NULL \|\| a->af != b->af)
151	return -1;
152
153	memcpy(dst, a, sizeof(*dst));
154	switch (a->af) {
155	case AF_INET:
156	dst->v4.s_addr &= b->v4.s_addr;
157	return 0;
158	case AF_INET6:
159	dst->scope_id = a->scope_id;
160	for (i = 0; i < 4; i++)
161	dst->addr32[i] &= b->addr32[i];
162	return 0;
163	default:
164	return -1;
165	}
166	}
167
168	/*
169	* Compare addresses 'a' and 'b'
170	* Return 0 if addresses are identical, -1 if (a < b) or 1 if (a > b)
171	*/
172	static int
173	addr_cmp(const struct xaddr a, const struct xaddr b)
174	{
175	int i;
176
177	if (a->af != b->af)
178	return a->af == AF_INET6 ? 1 : -1;
179
180	switch (a->af) {
181	case AF_INET:
182	if (a->v4.s_addr == b->v4.s_addr)
183	return 0;
184	return ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1;
185	case AF_INET6:
186	for (i = 0; i < 16; i++)
187	if (a->addr8[i] - b->addr8[i] != 0)
188	return a->addr8[i] > b->addr8[i] ? 1 : -1;
189	if (a->scope_id == b->scope_id)
190	return 0;
191	return a->scope_id > b->scope_id ? 1 : -1;
192	default:
193	return -1;
194	}
195	}
196
197	/*
198	* Parse string address 'p' into 'n'
199	* Returns 0 on success, -1 on failure.
200	*/
201	static int
202	addr_pton(const char p, struct xaddr n)
203	{
204	struct addrinfo hints, *ai;
205
206	memset(&hints, '\0', sizeof(hints));
207	hints.ai_flags = AI_NUMERICHOST;
208
209	if (p == NULL \|\| getaddrinfo(p, NULL, &hints, &ai) != 0)
210	return -1;
211
212	if (ai == NULL \|\| ai->ai_addr == NULL)
213	return -1;
214
215	if (n != NULL &&
216	addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen, n) == -1) {
217	freeaddrinfo(ai);
218	return -1;
219	}
220
221	freeaddrinfo(ai);
222	return 0;
223	}
224
225	/*
226	* Perform bitwise negation of address
227	* Returns 0 on success, -1 on failure.
228	*/
229	static int
230	addr_invert(struct xaddr *n)
231	{
232	int i;
233
234	if (n == NULL)
235	return (-1);
236
237	switch (n->af) {
238	case AF_INET:
239	n->v4.s_addr = ~n->v4.s_addr;
240	return (0);
241	case AF_INET6:
242	for (i = 0; i < 4; i++)
243	n->addr32[i] = ~n->addr32[i];
244	return (0);
245	default:
246	return (-1);
247	}
248	}
249
250	/*
251	* Calculate a netmask of length 'l' for address family 'af' and
252	* store it in 'n'.
253	* Returns 0 on success, -1 on failure.
254	*/
255	static int
256	addr_hostmask(int af, u_int l, struct xaddr *n)
257	{
258	if (addr_netmask(af, l, n) == -1 \|\| addr_invert(n) == -1)
259	return (-1);
260	return (0);
261	}
262
263	/*
264	* Test whether address 'a' is all zeros (i.e. 0.0.0.0 or ::)
265	* Returns 0 on if address is all-zeros, -1 if not all zeros or on failure.
266	*/
267	static int
268	addr_is_all0s(const struct xaddr *a)
269	{
270	int i;
271
272	switch (a->af) {
273	case AF_INET:
274	return (a->v4.s_addr == 0 ? 0 : -1);
275	case AF_INET6:;
276	for (i = 0; i < 4; i++)
277	if (a->addr32[i] != 0)
278	return (-1);
279	return (0);
280	default:
281	return (-1);
282	}
283	}
284
285	/*
286	* Test whether host portion of address 'a', as determined by 'masklen'
287	* is all zeros.
288	* Returns 0 on if host portion of address is all-zeros,
289	* -1 if not all zeros or on failure.
290	*/
291	static int
292	addr_host_is_all0s(const struct xaddr *a, u_int masklen)
293	{
294	struct xaddr tmp_addr, tmp_mask, tmp_result;
295
296	memcpy(&tmp_addr, a, sizeof(tmp_addr));
297	if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
298	return (-1);
299	if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
300	return (-1);
301	return (addr_is_all0s(&tmp_result));
302	}
303
304	/*
305	* Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
306	* Return -1 on parse error, -2 on inconsistency or 0 on success.
307	*/
308	static int
309	addr_pton_cidr(const char p, struct xaddr n, u_int *l)
310	{
311	struct xaddr tmp;
312	long unsigned int masklen = 999;
313	char addrbuf[64], mp, cp;
314
315	/* Don't modify argument */
316	if (p == NULL \|\| strlcpy(addrbuf, p, sizeof(addrbuf)) > sizeof(addrbuf))
317	return -1;
318
319	if ((mp = strchr(addrbuf, '/')) != NULL) {
320	*mp = '\0';
321	mp++;
322	masklen = strtoul(mp, &cp, 10);
323	if (mp == '\0' \|\| cp != '\0' \|\| masklen > 128)
324	return -1;
325	}
326
327	if (addr_pton(addrbuf, &tmp) == -1)
328	return -1;
329
330	if (mp == NULL)
331	masklen = addr_unicast_masklen(tmp.af);
332	if (masklen_valid(tmp.af, masklen) == -1)
333	return -2;
334	if (addr_host_is_all0s(&tmp, masklen) != 0)
335	return -2;
336
337	if (n != NULL)
338	memcpy(n, &tmp, sizeof(*n));
339	if (l != NULL)
340	*l = masklen;
341
342	return 0;
343	}
344
345	static int
346	addr_netmatch(const struct xaddr host, const struct xaddr net, u_int masklen)
347	{
348	struct xaddr tmp_mask, tmp_result;
349
350	if (host->af != net->af)
351	return -1;
352
353	if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
354	return -1;
355	if (addr_and(&tmp_result, host, &tmp_mask) == -1)
356	return -1;
357	return addr_cmp(&tmp_result, net);
358	}
359
360	/*
361	* Match "addr" against list pattern list "_list", which may contain a
362	* mix of CIDR addresses and old-school wildcards.
363	*
364	* If addr is NULL, then no matching is performed, but _list is parsed
365	* and checked for well-formedness.
366	*
367	* Returns 1 on match found (never returned when addr == NULL).
368	* Returns 0 on if no match found, or no errors found when addr == NULL.
369	* Returns -1 on negated match found (never returned when addr == NULL).
370	* Returns -2 on invalid list entry.
371	*/
372	int
373	addr_match_list(const char addr, const char _list)
374	{
375	char list, cp, *o;
376	struct xaddr try_addr, match_addr;
377	u_int masklen, neg;
378	int ret = 0, r;
379
380	if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
381	debug2("%s: couldn't parse address %.100s", __func__, addr);
382	return 0;
383	}
384	if ((o = list = strdup(_list)) == NULL)
385	return -1;
386	while ((cp = strsep(&list, ",")) != NULL) {
387	neg = *cp == '!';
388	if (neg)
389	cp++;
390	if (*cp == '\0') {
391	ret = -2;
392	break;
393	}
394	/* Prefer CIDR address matching */
395	r = addr_pton_cidr(cp, &match_addr, &masklen);
396	if (r == -2) {
397	error("Inconsistent mask length for "
398	"network \"%.100s\"", cp);
399	ret = -2;
400	break;
401	} else if (r == 0) {
402	if (addr != NULL && addr_netmatch(&try_addr,
403	&match_addr, masklen) == 0) {
404	foundit:
405	if (neg) {
406	ret = -1;
407	break;
408	}
409	ret = 1;
410	}
411	continue;
412	} else {
413	/* If CIDR parse failed, try wildcard string match */
414	if (addr != NULL && match_pattern(addr, cp) == 1)
415	goto foundit;
416	}
417	}
418	free(o);
419
420	return ret;
421	}