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1.5 ! djm 1: /* $OpenBSD: addr.c,v 1.4 2021/10/22 10:51:57 dtucker Exp $ */
1.1 dtucker 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 <sys/types.h>
20: #include <sys/socket.h>
21: #include <netinet/in.h>
22: #include <arpa/inet.h>
23:
24: #include <netdb.h>
25: #include <string.h>
26: #include <stdlib.h>
27: #include <stdio.h>
28:
29: #include "addr.h"
30:
31: #define _SA(x) ((struct sockaddr *)(x))
32:
33: int
34: addr_unicast_masklen(int af)
35: {
36: switch (af) {
37: case AF_INET:
38: return 32;
39: case AF_INET6:
40: return 128;
41: default:
42: return -1;
43: }
44: }
45:
46: static inline int
47: masklen_valid(int af, u_int masklen)
48: {
49: switch (af) {
50: case AF_INET:
51: return masklen <= 32 ? 0 : -1;
52: case AF_INET6:
53: return masklen <= 128 ? 0 : -1;
54: default:
55: return -1;
56: }
57: }
58:
59: int
60: addr_xaddr_to_sa(const struct xaddr *xa, struct sockaddr *sa, socklen_t *len,
61: u_int16_t port)
62: {
63: struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
64: struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
65:
66: if (xa == NULL || sa == NULL || len == NULL)
67: return -1;
68:
69: switch (xa->af) {
70: case AF_INET:
71: if (*len < sizeof(*in4))
72: return -1;
73: memset(sa, '\0', sizeof(*in4));
74: *len = sizeof(*in4);
75: #ifdef SOCK_HAS_LEN
76: in4->sin_len = sizeof(*in4);
77: #endif
78: in4->sin_family = AF_INET;
79: in4->sin_port = htons(port);
80: memcpy(&in4->sin_addr, &xa->v4, sizeof(in4->sin_addr));
81: break;
82: case AF_INET6:
83: if (*len < sizeof(*in6))
84: return -1;
85: memset(sa, '\0', sizeof(*in6));
86: *len = sizeof(*in6);
87: #ifdef SOCK_HAS_LEN
88: in6->sin6_len = sizeof(*in6);
89: #endif
90: in6->sin6_family = AF_INET6;
91: in6->sin6_port = htons(port);
92: memcpy(&in6->sin6_addr, &xa->v6, sizeof(in6->sin6_addr));
93: in6->sin6_scope_id = xa->scope_id;
94: break;
95: default:
96: return -1;
97: }
98: return 0;
99: }
100:
101: /*
102: * Convert struct sockaddr to struct xaddr
103: * Returns 0 on success, -1 on failure.
104: */
105: int
106: addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
107: {
108: struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
109: struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
110:
111: memset(xa, '\0', sizeof(*xa));
112:
113: switch (sa->sa_family) {
114: case AF_INET:
115: if (slen < (socklen_t)sizeof(*in4))
116: return -1;
117: xa->af = AF_INET;
118: memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
119: break;
120: case AF_INET6:
121: if (slen < (socklen_t)sizeof(*in6))
122: return -1;
123: xa->af = AF_INET6;
124: memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
125: #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
126: xa->scope_id = in6->sin6_scope_id;
127: #endif
128: break;
129: default:
130: return -1;
131: }
132:
133: return 0;
134: }
135:
136: int
137: addr_invert(struct xaddr *n)
138: {
139: int i;
140:
141: if (n == NULL)
142: return -1;
143:
144: switch (n->af) {
145: case AF_INET:
146: n->v4.s_addr = ~n->v4.s_addr;
147: return 0;
148: case AF_INET6:
149: for (i = 0; i < 4; i++)
150: n->addr32[i] = ~n->addr32[i];
151: return 0;
152: default:
153: return -1;
154: }
155: }
156:
157: /*
158: * Calculate a netmask of length 'l' for address family 'af' and
159: * store it in 'n'.
160: * Returns 0 on success, -1 on failure.
161: */
162: int
163: addr_netmask(int af, u_int l, struct xaddr *n)
164: {
165: int i;
166:
167: if (masklen_valid(af, l) != 0 || n == NULL)
168: return -1;
169:
170: memset(n, '\0', sizeof(*n));
171: switch (af) {
172: case AF_INET:
173: n->af = AF_INET;
174: if (l == 0)
175: return 0;
176: n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
177: return 0;
178: case AF_INET6:
179: n->af = AF_INET6;
180: for (i = 0; i < 4 && l >= 32; i++, l -= 32)
181: n->addr32[i] = 0xffffffffU;
182: if (i < 4 && l != 0)
183: n->addr32[i] = htonl((0xffffffff << (32 - l)) &
184: 0xffffffff);
185: return 0;
186: default:
187: return -1;
188: }
189: }
190:
191: int
192: addr_hostmask(int af, u_int l, struct xaddr *n)
193: {
194: if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
195: return -1;
196: return 0;
197: }
198:
199: /*
200: * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
201: * Returns 0 on success, -1 on failure.
202: */
203: int
204: addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
205: {
206: int i;
207:
208: if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
209: return -1;
210:
211: memcpy(dst, a, sizeof(*dst));
212: switch (a->af) {
213: case AF_INET:
214: dst->v4.s_addr &= b->v4.s_addr;
215: return 0;
216: case AF_INET6:
217: dst->scope_id = a->scope_id;
218: for (i = 0; i < 4; i++)
219: dst->addr32[i] &= b->addr32[i];
220: return 0;
221: default:
222: return -1;
223: }
224: }
225:
226: int
227: addr_cmp(const struct xaddr *a, const struct xaddr *b)
228: {
229: int i;
230:
231: if (a->af != b->af)
232: return (a->af == AF_INET6 ? 1 : -1);
233:
234: switch (a->af) {
235: case AF_INET:
236: /*
237: * Can't just subtract here as 255.255.255.255 - 0.0.0.0 is
238: * too big to fit into a signed int
239: */
240: if (a->v4.s_addr == b->v4.s_addr)
241: return 0;
242: return (ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1);
1.3 dtucker 243: case AF_INET6:
1.1 dtucker 244: /*
245: * Do this a byte at a time to avoid the above issue and
246: * any endian problems
247: */
248: for (i = 0; i < 16; i++)
249: if (a->addr8[i] - b->addr8[i] != 0)
250: return (a->addr8[i] - b->addr8[i]);
251: if (a->scope_id == b->scope_id)
252: return (0);
253: return (a->scope_id > b->scope_id ? 1 : -1);
254: default:
255: return (-1);
256: }
257: }
258:
259: int
260: addr_is_all0s(const struct xaddr *a)
261: {
262: int i;
263:
264: switch (a->af) {
265: case AF_INET:
266: return (a->v4.s_addr == 0 ? 0 : -1);
1.3 dtucker 267: case AF_INET6:
1.1 dtucker 268: for (i = 0; i < 4; i++)
269: if (a->addr32[i] != 0)
270: return -1;
271: return 0;
272: default:
273: return -1;
274: }
275: }
276:
277: /*
278: * Test whether host portion of address 'a', as determined by 'masklen'
279: * is all zeros.
1.2 dtucker 280: * Returns 0 if host portion of address is all-zeros,
1.1 dtucker 281: * -1 if not all zeros or on failure.
282: */
283: int
284: addr_host_is_all0s(const struct xaddr *a, u_int masklen)
285: {
286: struct xaddr tmp_addr, tmp_mask, tmp_result;
287:
288: memcpy(&tmp_addr, a, sizeof(tmp_addr));
289: if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
290: return -1;
291: if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
292: return -1;
293: return addr_is_all0s(&tmp_result);
294: }
295:
296: /*
1.2 dtucker 297: * Parse string address 'p' into 'n'.
1.1 dtucker 298: * Returns 0 on success, -1 on failure.
299: */
300: int
301: addr_pton(const char *p, struct xaddr *n)
302: {
303: struct addrinfo hints, *ai;
304:
305: memset(&hints, '\0', sizeof(hints));
306: hints.ai_flags = AI_NUMERICHOST;
307:
308: if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
309: return -1;
310:
1.4 dtucker 311: if (ai == NULL)
1.1 dtucker 312: return -1;
313:
1.4 dtucker 314: if (ai->ai_addr == NULL) {
315: freeaddrinfo(ai);
316: return -1;
317: }
318:
1.1 dtucker 319: if (n != NULL && addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen,
320: n) == -1) {
321: freeaddrinfo(ai);
322: return -1;
323: }
324:
325: freeaddrinfo(ai);
326: return 0;
327: }
328:
329: int
330: addr_sa_pton(const char *h, const char *s, struct sockaddr *sa, socklen_t slen)
331: {
332: struct addrinfo hints, *ai;
333:
334: memset(&hints, '\0', sizeof(hints));
335: hints.ai_flags = AI_NUMERICHOST;
336:
337: if (h == NULL || getaddrinfo(h, s, &hints, &ai) != 0)
338: return -1;
339:
1.4 dtucker 340: if (ai == NULL)
1.1 dtucker 341: return -1;
342:
1.4 dtucker 343: if (ai->ai_addr == NULL) {
344: freeaddrinfo(ai);
345: return -1;
346: }
347:
1.1 dtucker 348: if (sa != NULL) {
1.4 dtucker 349: if (slen < ai->ai_addrlen) {
350: freeaddrinfo(ai);
1.1 dtucker 351: return -1;
1.4 dtucker 352: }
1.1 dtucker 353: memcpy(sa, &ai->ai_addr, ai->ai_addrlen);
354: }
355:
356: freeaddrinfo(ai);
357: return 0;
358: }
359:
360: int
361: addr_ntop(const struct xaddr *n, char *p, size_t len)
362: {
363: struct sockaddr_storage ss;
364: socklen_t slen = sizeof(ss);
365:
366: if (addr_xaddr_to_sa(n, _SA(&ss), &slen, 0) == -1)
367: return -1;
1.4 dtucker 368: if (p == NULL || len == 0)
1.1 dtucker 369: return -1;
370: if (getnameinfo(_SA(&ss), slen, p, len, NULL, 0,
371: NI_NUMERICHOST) == -1)
372: return -1;
373:
374: return 0;
375: }
376:
377: /*
378: * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
379: * Return -1 on parse error, -2 on inconsistency or 0 on success.
380: */
381: int
382: addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
383: {
384: struct xaddr tmp;
385: long unsigned int masklen = 999;
386: char addrbuf[64], *mp, *cp;
387:
388: /* Don't modify argument */
389: if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) >= sizeof(addrbuf))
390: return -1;
391:
392: if ((mp = strchr(addrbuf, '/')) != NULL) {
393: *mp = '\0';
394: mp++;
395: masklen = strtoul(mp, &cp, 10);
1.5 ! djm 396: if (*mp < '0' || *mp > '9' || *cp != '\0' || masklen > 128)
1.1 dtucker 397: return -1;
398: }
399:
400: if (addr_pton(addrbuf, &tmp) == -1)
401: return -1;
402:
403: if (mp == NULL)
404: masklen = addr_unicast_masklen(tmp.af);
405: if (masklen_valid(tmp.af, masklen) == -1)
406: return -2;
407: if (addr_host_is_all0s(&tmp, masklen) != 0)
408: return -2;
409:
410: if (n != NULL)
411: memcpy(n, &tmp, sizeof(*n));
412: if (l != NULL)
413: *l = masklen;
414:
415: return 0;
416: }
417:
418: int
419: addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
420: {
421: struct xaddr tmp_mask, tmp_result;
422:
423: if (host->af != net->af)
424: return -1;
425:
426: if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
427: return -1;
428: if (addr_and(&tmp_result, host, &tmp_mask) == -1)
429: return -1;
430: return addr_cmp(&tmp_result, net);
431: }