1 /* $OpenBSD: addrmatch.c,v 1.4 2008/12/10 03:55:20 stevesk Exp $ */
4 * Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org>
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.
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.
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
43 } xa; /* 128-bit address */
44 u_int32_t scope_id; /* iface scope id for v6 */
47 #define addr8 xa.addr8
48 #define addr32 xa.addr32
52 addr_unicast_masklen(int af)
65 masklen_valid(int af, u_int masklen)
69 return masklen <= 32 ? 0 : -1;
71 return masklen <= 128 ? 0 : -1;
78 * Convert struct sockaddr to struct xaddr
79 * Returns 0 on success, -1 on failure.
82 addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
84 struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
85 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
87 memset(xa, '\0', sizeof(*xa));
89 switch (sa->sa_family) {
91 if (slen < sizeof(*in4))
94 memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
97 if (slen < sizeof(*in6))
100 memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
101 #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
102 xa->scope_id = in6->sin6_scope_id;
113 * Calculate a netmask of length 'l' for address family 'af' and
115 * Returns 0 on success, -1 on failure.
118 addr_netmask(int af, u_int l, struct xaddr *n)
122 if (masklen_valid(af, l) != 0 || n == NULL)
125 memset(n, '\0', sizeof(*n));
129 n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
133 for (i = 0; i < 4 && l >= 32; i++, l -= 32)
134 n->addr32[i] = 0xffffffffU;
136 n->addr32[i] = htonl((0xffffffff << (32 - l)) &
145 * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
146 * Returns 0 on success, -1 on failure.
149 addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
153 if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
156 memcpy(dst, a, sizeof(*dst));
159 dst->v4.s_addr &= b->v4.s_addr;
162 dst->scope_id = a->scope_id;
163 for (i = 0; i < 4; i++)
164 dst->addr32[i] &= b->addr32[i];
172 * Compare addresses 'a' and 'b'
173 * Return 0 if addresses are identical, -1 if (a < b) or 1 if (a > b)
176 addr_cmp(const struct xaddr *a, const struct xaddr *b)
181 return a->af == AF_INET6 ? 1 : -1;
185 if (a->v4.s_addr == b->v4.s_addr)
187 return ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1;
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)
194 return a->scope_id > b->scope_id ? 1 : -1;
201 * Parse string address 'p' into 'n'
202 * Returns 0 on success, -1 on failure.
205 addr_pton(const char *p, struct xaddr *n)
207 struct addrinfo hints, *ai;
209 memset(&hints, '\0', sizeof(hints));
210 hints.ai_flags = AI_NUMERICHOST;
212 if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
215 if (ai == NULL || ai->ai_addr == NULL)
219 addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen, n) == -1) {
229 * Perform bitwise negation of address
230 * Returns 0 on success, -1 on failure.
233 addr_invert(struct xaddr *n)
242 n->v4.s_addr = ~n->v4.s_addr;
245 for (i = 0; i < 4; i++)
246 n->addr32[i] = ~n->addr32[i];
254 * Calculate a netmask of length 'l' for address family 'af' and
256 * Returns 0 on success, -1 on failure.
259 addr_hostmask(int af, u_int l, struct xaddr *n)
261 if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
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.
271 addr_is_all0s(const struct xaddr *a)
277 return (a->v4.s_addr == 0 ? 0 : -1);
279 for (i = 0; i < 4; i++)
280 if (a->addr32[i] != 0)
289 * Test whether host portion of address 'a', as determined by 'masklen'
291 * Returns 0 on if host portion of address is all-zeros,
292 * -1 if not all zeros or on failure.
295 addr_host_is_all0s(const struct xaddr *a, u_int masklen)
297 struct xaddr tmp_addr, tmp_mask, tmp_result;
299 memcpy(&tmp_addr, a, sizeof(tmp_addr));
300 if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
302 if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
304 return (addr_is_all0s(&tmp_result));
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.
312 addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
315 long unsigned int masklen = 999;
316 char addrbuf[64], *mp, *cp;
318 /* Don't modify argument */
319 if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) > sizeof(addrbuf))
322 if ((mp = strchr(addrbuf, '/')) != NULL) {
325 masklen = strtoul(mp, &cp, 10);
326 if (*mp == '\0' || *cp != '\0' || masklen > 128)
330 if (addr_pton(addrbuf, &tmp) == -1)
334 masklen = addr_unicast_masklen(tmp.af);
335 if (masklen_valid(tmp.af, masklen) == -1)
337 if (addr_host_is_all0s(&tmp, masklen) != 0)
341 memcpy(n, &tmp, sizeof(*n));
349 addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
351 struct xaddr tmp_mask, tmp_result;
353 if (host->af != net->af)
356 if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
358 if (addr_and(&tmp_result, host, &tmp_mask) == -1)
360 return addr_cmp(&tmp_result, net);
364 * Match "addr" against list pattern list "_list", which may contain a
365 * mix of CIDR addresses and old-school wildcards.
367 * If addr is NULL, then no matching is performed, but _list is parsed
368 * and checked for well-formedness.
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.
372 * Returns -1 on negated match found (never returned when addr == NULL).
373 * Returns -2 on invalid list entry.
376 addr_match_list(const char *addr, const char *_list)
379 struct xaddr try_addr, match_addr;
383 if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
384 debug2("%s: couldn't parse address %.100s", __func__, addr);
387 if ((o = list = strdup(_list)) == NULL)
389 while ((cp = strsep(&list, ",")) != NULL) {
397 /* Prefer CIDR address matching */
398 r = addr_pton_cidr(cp, &match_addr, &masklen);
400 error("Inconsistent mask length for "
401 "network \"%.100s\"", cp);
405 if (addr != NULL && addr_netmatch(&try_addr,
406 &match_addr, masklen) == 0) {
416 /* If CIDR parse failed, try wildcard string match */
417 if (addr != NULL && match_pattern(addr, cp) == 1)