1 /* $OpenBSD: addr.c,v 1.1 2021/01/09 11:58:50 dtucker 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_cmp(const struct xaddr *a, const struct xaddr *b)
236 return (a->af == AF_INET6 ? 1 : -1);
241 * Can't just subtract here as 255.255.255.255 - 0.0.0.0 is
242 * too big to fit into a signed int
244 if (a->v4.s_addr == b->v4.s_addr)
246 return (ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1);
249 * Do this a byte at a time to avoid the above issue and
250 * any endian problems
252 for (i = 0; i < 16; i++)
253 if (a->addr8[i] - b->addr8[i] != 0)
254 return (a->addr8[i] - b->addr8[i]);
255 if (a->scope_id == b->scope_id)
257 return (a->scope_id > b->scope_id ? 1 : -1);
264 addr_is_all0s(const struct xaddr *a)
270 return (a->v4.s_addr == 0 ? 0 : -1);
272 for (i = 0; i < 4; i++)
273 if (a->addr32[i] != 0)
282 * Test whether host portion of address 'a', as determined by 'masklen'
284 * Returns 0 on if host portion of address is all-zeros,
285 * -1 if not all zeros or on failure.
288 addr_host_is_all0s(const struct xaddr *a, u_int masklen)
290 struct xaddr tmp_addr, tmp_mask, tmp_result;
292 memcpy(&tmp_addr, a, sizeof(tmp_addr));
293 if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
295 if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
297 return addr_is_all0s(&tmp_result);
301 * Parse string address 'p' into 'n'
302 * Returns 0 on success, -1 on failure.
305 addr_pton(const char *p, struct xaddr *n)
307 struct addrinfo hints, *ai;
309 memset(&hints, '\0', sizeof(hints));
310 hints.ai_flags = AI_NUMERICHOST;
312 if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
315 if (ai == NULL || ai->ai_addr == NULL)
318 if (n != NULL && addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen,
329 addr_sa_pton(const char *h, const char *s, struct sockaddr *sa, socklen_t slen)
331 struct addrinfo hints, *ai;
333 memset(&hints, '\0', sizeof(hints));
334 hints.ai_flags = AI_NUMERICHOST;
336 if (h == NULL || getaddrinfo(h, s, &hints, &ai) != 0)
339 if (ai == NULL || ai->ai_addr == NULL)
343 if (slen < ai->ai_addrlen)
345 memcpy(sa, &ai->ai_addr, ai->ai_addrlen);
353 addr_ntop(const struct xaddr *n, char *p, size_t len)
355 struct sockaddr_storage ss;
356 socklen_t slen = sizeof(ss);
358 if (addr_xaddr_to_sa(n, _SA(&ss), &slen, 0) == -1)
360 if (n == NULL || p == NULL || len == 0)
362 if (getnameinfo(_SA(&ss), slen, p, len, NULL, 0,
363 NI_NUMERICHOST) == -1)
370 * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
371 * Return -1 on parse error, -2 on inconsistency or 0 on success.
374 addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
377 long unsigned int masklen = 999;
378 char addrbuf[64], *mp, *cp;
380 /* Don't modify argument */
381 if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) >= sizeof(addrbuf))
384 if ((mp = strchr(addrbuf, '/')) != NULL) {
387 masklen = strtoul(mp, &cp, 10);
388 if (*mp == '\0' || *cp != '\0' || masklen > 128)
392 if (addr_pton(addrbuf, &tmp) == -1)
396 masklen = addr_unicast_masklen(tmp.af);
397 if (masklen_valid(tmp.af, masklen) == -1)
399 if (addr_host_is_all0s(&tmp, masklen) != 0)
403 memcpy(n, &tmp, sizeof(*n));
411 addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
413 struct xaddr tmp_mask, tmp_result;
415 if (host->af != net->af)
418 if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
420 if (addr_and(&tmp_result, host, &tmp_mask) == -1)
422 return addr_cmp(&tmp_result, net);