1 /* $OpenBSD: addr.c,v 1.7 2023/03/27 03:31:05 djm 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>
33 #define _SA(x) ((struct sockaddr *)(x))
36 addr_unicast_masklen(int af)
49 masklen_valid(int af, u_int masklen)
53 return masklen <= 32 ? 0 : -1;
55 return masklen <= 128 ? 0 : -1;
62 addr_xaddr_to_sa(const struct xaddr *xa, struct sockaddr *sa, socklen_t *len,
65 struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
66 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
68 if (xa == NULL || sa == NULL || len == NULL)
73 if (*len < sizeof(*in4))
75 memset(sa, '\0', sizeof(*in4));
78 in4->sin_len = sizeof(*in4);
80 in4->sin_family = AF_INET;
81 in4->sin_port = htons(port);
82 memcpy(&in4->sin_addr, &xa->v4, sizeof(in4->sin_addr));
85 if (*len < sizeof(*in6))
87 memset(sa, '\0', sizeof(*in6));
90 in6->sin6_len = sizeof(*in6);
92 in6->sin6_family = AF_INET6;
93 in6->sin6_port = htons(port);
94 memcpy(&in6->sin6_addr, &xa->v6, sizeof(in6->sin6_addr));
95 #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
96 in6->sin6_scope_id = xa->scope_id;
106 * Convert struct sockaddr to struct xaddr
107 * Returns 0 on success, -1 on failure.
110 addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
112 struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
113 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
115 memset(xa, '\0', sizeof(*xa));
117 switch (sa->sa_family) {
119 if (slen < (socklen_t)sizeof(*in4))
122 memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
125 if (slen < (socklen_t)sizeof(*in6))
128 memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
129 #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
130 xa->scope_id = in6->sin6_scope_id;
141 addr_invert(struct xaddr *n)
150 n->v4.s_addr = ~n->v4.s_addr;
153 for (i = 0; i < 4; i++)
154 n->addr32[i] = ~n->addr32[i];
162 * Calculate a netmask of length 'l' for address family 'af' and
164 * Returns 0 on success, -1 on failure.
167 addr_netmask(int af, u_int l, struct xaddr *n)
171 if (masklen_valid(af, l) != 0 || n == NULL)
174 memset(n, '\0', sizeof(*n));
180 n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
184 for (i = 0; i < 4 && l >= 32; i++, l -= 32)
185 n->addr32[i] = 0xffffffffU;
187 n->addr32[i] = htonl((0xffffffff << (32 - l)) &
196 addr_hostmask(int af, u_int l, struct xaddr *n)
198 if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
204 * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
205 * Returns 0 on success, -1 on failure.
208 addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
212 if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
215 memcpy(dst, a, sizeof(*dst));
218 dst->v4.s_addr &= b->v4.s_addr;
221 dst->scope_id = a->scope_id;
222 for (i = 0; i < 4; i++)
223 dst->addr32[i] &= b->addr32[i];
231 addr_or(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
235 if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
238 memcpy(dst, a, sizeof(*dst));
241 dst->v4.s_addr |= b->v4.s_addr;
244 for (i = 0; i < 4; i++)
245 dst->addr32[i] |= b->addr32[i];
253 addr_cmp(const struct xaddr *a, const struct xaddr *b)
258 return (a->af == AF_INET6 ? 1 : -1);
263 * Can't just subtract here as 255.255.255.255 - 0.0.0.0 is
264 * too big to fit into a signed int
266 if (a->v4.s_addr == b->v4.s_addr)
268 return (ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1);
271 * Do this a byte at a time to avoid the above issue and
272 * any endian problems
274 for (i = 0; i < 16; i++)
275 if (a->addr8[i] - b->addr8[i] != 0)
276 return (a->addr8[i] - b->addr8[i]);
277 if (a->scope_id == b->scope_id)
279 return (a->scope_id > b->scope_id ? 1 : -1);
286 addr_is_all0s(const struct xaddr *a)
292 return (a->v4.s_addr == 0 ? 0 : -1);
294 for (i = 0; i < 4; i++)
295 if (a->addr32[i] != 0)
303 /* Increment the specified address. Note, does not do overflow checking */
305 addr_increment(struct xaddr *a)
312 a->v4.s_addr = htonl(ntohl(a->v4.s_addr) + 1);
315 for (i = 0; i < 4; i++) {
316 /* Increment with carry */
317 n = ntohl(a->addr32[3 - i]) + 1;
318 a->addr32[3 - i] = htonl(n);
327 * Test whether host portion of address 'a', as determined by 'masklen'
329 * Returns 0 if host portion of address is all-zeros,
330 * -1 if not all zeros or on failure.
333 addr_host_is_all0s(const struct xaddr *a, u_int masklen)
335 struct xaddr tmp_addr, tmp_mask, tmp_result;
337 memcpy(&tmp_addr, a, sizeof(tmp_addr));
338 if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
340 if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
342 return addr_is_all0s(&tmp_result);
347 addr_host_to_all0s(struct xaddr *a, u_int masklen)
349 struct xaddr tmp_mask;
351 if (addr_netmask(a->af, masklen, &tmp_mask) == -1)
353 if (addr_and(a, a, &tmp_mask) == -1)
360 addr_host_to_all1s(struct xaddr *a, u_int masklen)
362 struct xaddr tmp_mask;
364 if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
366 if (addr_or(a, a, &tmp_mask) == -1)
372 * Parse string address 'p' into 'n'.
373 * Returns 0 on success, -1 on failure.
376 addr_pton(const char *p, struct xaddr *n)
378 struct addrinfo hints, *ai;
380 memset(&hints, '\0', sizeof(hints));
381 hints.ai_flags = AI_NUMERICHOST;
383 if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
389 if (ai->ai_addr == NULL) {
394 if (n != NULL && addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen,
405 addr_sa_pton(const char *h, const char *s, struct sockaddr *sa, socklen_t slen)
407 struct addrinfo hints, *ai;
409 memset(&hints, '\0', sizeof(hints));
410 hints.ai_flags = AI_NUMERICHOST;
412 if (h == NULL || getaddrinfo(h, s, &hints, &ai) != 0)
418 if (ai->ai_addr == NULL) {
424 if (slen < ai->ai_addrlen) {
428 memcpy(sa, &ai->ai_addr, ai->ai_addrlen);
436 addr_ntop(const struct xaddr *n, char *p, size_t len)
438 struct sockaddr_storage ss;
439 socklen_t slen = sizeof(ss);
441 if (addr_xaddr_to_sa(n, _SA(&ss), &slen, 0) == -1)
443 if (p == NULL || len == 0)
445 if (getnameinfo(_SA(&ss), slen, p, len, NULL, 0,
446 NI_NUMERICHOST) != 0)
453 * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
454 * Return -1 on parse error, -2 on inconsistency or 0 on success.
457 addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
460 long unsigned int masklen = 999;
461 char addrbuf[64], *mp, *cp;
463 /* Don't modify argument */
464 if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) >= sizeof(addrbuf))
467 if ((mp = strchr(addrbuf, '/')) != NULL) {
470 masklen = strtoul(mp, &cp, 10);
471 if (*mp < '0' || *mp > '9' || *cp != '\0' || masklen > 128)
475 if (addr_pton(addrbuf, &tmp) == -1)
479 masklen = addr_unicast_masklen(tmp.af);
480 if (masklen_valid(tmp.af, masklen) == -1)
482 if (addr_host_is_all0s(&tmp, masklen) != 0)
486 memcpy(n, &tmp, sizeof(*n));
494 addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
496 struct xaddr tmp_mask, tmp_result;
498 if (host->af != net->af)
501 if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
503 if (addr_and(&tmp_result, host, &tmp_mask) == -1)
505 return addr_cmp(&tmp_result, net);