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1.8 ! deraadt 1: /* $OpenBSD: addr.c,v 1.7 2023/03/27 03:31:05 djm 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>
1.8 ! deraadt 28: #include <limits.h>
1.1 dtucker 29:
30: #include "addr.h"
31:
32: #define _SA(x) ((struct sockaddr *)(x))
33:
34: int
35: addr_unicast_masklen(int af)
36: {
37: switch (af) {
38: case AF_INET:
39: return 32;
40: case AF_INET6:
41: return 128;
42: default:
43: return -1;
44: }
45: }
46:
47: static inline int
48: masklen_valid(int af, u_int masklen)
49: {
50: switch (af) {
51: case AF_INET:
52: return masklen <= 32 ? 0 : -1;
53: case AF_INET6:
54: return masklen <= 128 ? 0 : -1;
55: default:
56: return -1;
57: }
58: }
59:
60: int
61: addr_xaddr_to_sa(const struct xaddr *xa, struct sockaddr *sa, socklen_t *len,
62: u_int16_t port)
63: {
64: struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
65: struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
66:
67: if (xa == NULL || sa == NULL || len == NULL)
68: return -1;
69:
70: switch (xa->af) {
71: case AF_INET:
72: if (*len < sizeof(*in4))
73: return -1;
74: memset(sa, '\0', sizeof(*in4));
75: *len = sizeof(*in4);
76: #ifdef SOCK_HAS_LEN
77: in4->sin_len = sizeof(*in4);
78: #endif
79: in4->sin_family = AF_INET;
80: in4->sin_port = htons(port);
81: memcpy(&in4->sin_addr, &xa->v4, sizeof(in4->sin_addr));
82: break;
83: case AF_INET6:
84: if (*len < sizeof(*in6))
85: return -1;
86: memset(sa, '\0', sizeof(*in6));
87: *len = sizeof(*in6);
88: #ifdef SOCK_HAS_LEN
89: in6->sin6_len = sizeof(*in6);
90: #endif
91: in6->sin6_family = AF_INET6;
92: in6->sin6_port = htons(port);
93: memcpy(&in6->sin6_addr, &xa->v6, sizeof(in6->sin6_addr));
94: in6->sin6_scope_id = xa->scope_id;
95: break;
96: default:
97: return -1;
98: }
99: return 0;
100: }
101:
102: /*
103: * Convert struct sockaddr to struct xaddr
104: * Returns 0 on success, -1 on failure.
105: */
106: int
107: addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
108: {
109: struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
110: struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
111:
112: memset(xa, '\0', sizeof(*xa));
113:
114: switch (sa->sa_family) {
115: case AF_INET:
116: if (slen < (socklen_t)sizeof(*in4))
117: return -1;
118: xa->af = AF_INET;
119: memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
120: break;
121: case AF_INET6:
122: if (slen < (socklen_t)sizeof(*in6))
123: return -1;
124: xa->af = AF_INET6;
125: memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
126: #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
127: xa->scope_id = in6->sin6_scope_id;
128: #endif
129: break;
130: default:
131: return -1;
132: }
133:
134: return 0;
135: }
136:
137: int
138: addr_invert(struct xaddr *n)
139: {
140: int i;
141:
142: if (n == NULL)
143: return -1;
144:
145: switch (n->af) {
146: case AF_INET:
147: n->v4.s_addr = ~n->v4.s_addr;
148: return 0;
149: case AF_INET6:
150: for (i = 0; i < 4; i++)
151: n->addr32[i] = ~n->addr32[i];
152: return 0;
153: default:
154: return -1;
155: }
156: }
157:
158: /*
159: * Calculate a netmask of length 'l' for address family 'af' and
160: * store it in 'n'.
161: * Returns 0 on success, -1 on failure.
162: */
163: int
164: addr_netmask(int af, u_int l, struct xaddr *n)
165: {
166: int i;
167:
168: if (masklen_valid(af, l) != 0 || n == NULL)
169: return -1;
170:
171: memset(n, '\0', sizeof(*n));
172: switch (af) {
173: case AF_INET:
174: n->af = AF_INET;
175: if (l == 0)
176: return 0;
177: n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
178: return 0;
179: case AF_INET6:
180: n->af = AF_INET6;
181: for (i = 0; i < 4 && l >= 32; i++, l -= 32)
182: n->addr32[i] = 0xffffffffU;
183: if (i < 4 && l != 0)
184: n->addr32[i] = htonl((0xffffffff << (32 - l)) &
185: 0xffffffff);
186: return 0;
187: default:
188: return -1;
189: }
190: }
191:
192: int
193: addr_hostmask(int af, u_int l, struct xaddr *n)
194: {
195: if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
196: return -1;
197: return 0;
198: }
199:
200: /*
201: * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
202: * Returns 0 on success, -1 on failure.
203: */
204: int
205: addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
206: {
207: int i;
208:
209: if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
210: return -1;
211:
212: memcpy(dst, a, sizeof(*dst));
213: switch (a->af) {
214: case AF_INET:
215: dst->v4.s_addr &= b->v4.s_addr;
216: return 0;
217: case AF_INET6:
218: dst->scope_id = a->scope_id;
219: for (i = 0; i < 4; i++)
220: dst->addr32[i] &= b->addr32[i];
221: return 0;
222: default:
223: return -1;
224: }
225: }
226:
227: int
1.6 djm 228: addr_or(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
229: {
230: int i;
231:
232: if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
233: return (-1);
234:
235: memcpy(dst, a, sizeof(*dst));
236: switch (a->af) {
237: case AF_INET:
238: dst->v4.s_addr |= b->v4.s_addr;
239: return (0);
240: case AF_INET6:
241: for (i = 0; i < 4; i++)
242: dst->addr32[i] |= b->addr32[i];
243: return (0);
244: default:
245: return (-1);
246: }
247: }
248:
249: int
1.1 dtucker 250: addr_cmp(const struct xaddr *a, const struct xaddr *b)
251: {
252: int i;
253:
254: if (a->af != b->af)
255: return (a->af == AF_INET6 ? 1 : -1);
256:
257: switch (a->af) {
258: case AF_INET:
259: /*
260: * Can't just subtract here as 255.255.255.255 - 0.0.0.0 is
261: * too big to fit into a signed int
262: */
263: if (a->v4.s_addr == b->v4.s_addr)
264: return 0;
265: return (ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1);
1.3 dtucker 266: case AF_INET6:
1.1 dtucker 267: /*
268: * Do this a byte at a time to avoid the above issue and
269: * any endian problems
270: */
271: for (i = 0; i < 16; i++)
272: if (a->addr8[i] - b->addr8[i] != 0)
273: return (a->addr8[i] - b->addr8[i]);
274: if (a->scope_id == b->scope_id)
275: return (0);
276: return (a->scope_id > b->scope_id ? 1 : -1);
277: default:
278: return (-1);
279: }
280: }
281:
282: int
283: addr_is_all0s(const struct xaddr *a)
284: {
285: int i;
286:
287: switch (a->af) {
288: case AF_INET:
289: return (a->v4.s_addr == 0 ? 0 : -1);
1.3 dtucker 290: case AF_INET6:
1.1 dtucker 291: for (i = 0; i < 4; i++)
292: if (a->addr32[i] != 0)
293: return -1;
294: return 0;
295: default:
296: return -1;
297: }
298: }
299:
1.6 djm 300: /* Increment the specified address. Note, does not do overflow checking */
301: void
302: addr_increment(struct xaddr *a)
303: {
304: int i;
305: uint32_t n;
306:
307: switch (a->af) {
308: case AF_INET:
309: a->v4.s_addr = htonl(ntohl(a->v4.s_addr) + 1);
310: break;
311: case AF_INET6:
312: for (i = 0; i < 4; i++) {
313: /* Increment with carry */
314: n = ntohl(a->addr32[3 - i]) + 1;
315: a->addr32[3 - i] = htonl(n);
316: if (n != 0)
317: break;
318: }
319: break;
320: }
321: }
322:
1.1 dtucker 323: /*
324: * Test whether host portion of address 'a', as determined by 'masklen'
325: * is all zeros.
1.2 dtucker 326: * Returns 0 if host portion of address is all-zeros,
1.1 dtucker 327: * -1 if not all zeros or on failure.
328: */
329: int
330: addr_host_is_all0s(const struct xaddr *a, u_int masklen)
331: {
332: struct xaddr tmp_addr, tmp_mask, tmp_result;
333:
334: memcpy(&tmp_addr, a, sizeof(tmp_addr));
335: if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
336: return -1;
337: if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
338: return -1;
339: return addr_is_all0s(&tmp_result);
1.6 djm 340: }
341:
342: #if 0
343: int
344: addr_host_to_all0s(struct xaddr *a, u_int masklen)
345: {
346: struct xaddr tmp_mask;
347:
348: if (addr_netmask(a->af, masklen, &tmp_mask) == -1)
349: return (-1);
350: if (addr_and(a, a, &tmp_mask) == -1)
351: return (-1);
352: return (0);
353: }
354: #endif
355:
356: int
357: addr_host_to_all1s(struct xaddr *a, u_int masklen)
358: {
359: struct xaddr tmp_mask;
360:
361: if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
362: return (-1);
363: if (addr_or(a, a, &tmp_mask) == -1)
364: return (-1);
365: return (0);
1.1 dtucker 366: }
367:
368: /*
1.2 dtucker 369: * Parse string address 'p' into 'n'.
1.1 dtucker 370: * Returns 0 on success, -1 on failure.
371: */
372: int
373: addr_pton(const char *p, struct xaddr *n)
374: {
375: struct addrinfo hints, *ai;
376:
377: memset(&hints, '\0', sizeof(hints));
378: hints.ai_flags = AI_NUMERICHOST;
379:
380: if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
381: return -1;
382:
1.4 dtucker 383: if (ai == NULL)
1.1 dtucker 384: return -1;
385:
1.4 dtucker 386: if (ai->ai_addr == NULL) {
387: freeaddrinfo(ai);
388: return -1;
389: }
390:
1.1 dtucker 391: if (n != NULL && addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen,
392: n) == -1) {
393: freeaddrinfo(ai);
394: return -1;
395: }
396:
397: freeaddrinfo(ai);
398: return 0;
399: }
400:
401: int
402: addr_sa_pton(const char *h, const char *s, struct sockaddr *sa, socklen_t slen)
403: {
404: struct addrinfo hints, *ai;
405:
406: memset(&hints, '\0', sizeof(hints));
407: hints.ai_flags = AI_NUMERICHOST;
408:
409: if (h == NULL || getaddrinfo(h, s, &hints, &ai) != 0)
410: return -1;
411:
1.4 dtucker 412: if (ai == NULL)
1.1 dtucker 413: return -1;
414:
1.4 dtucker 415: if (ai->ai_addr == NULL) {
416: freeaddrinfo(ai);
417: return -1;
418: }
419:
1.1 dtucker 420: if (sa != NULL) {
1.4 dtucker 421: if (slen < ai->ai_addrlen) {
422: freeaddrinfo(ai);
1.1 dtucker 423: return -1;
1.4 dtucker 424: }
1.1 dtucker 425: memcpy(sa, &ai->ai_addr, ai->ai_addrlen);
426: }
427:
428: freeaddrinfo(ai);
429: return 0;
430: }
431:
432: int
433: addr_ntop(const struct xaddr *n, char *p, size_t len)
434: {
435: struct sockaddr_storage ss;
436: socklen_t slen = sizeof(ss);
437:
438: if (addr_xaddr_to_sa(n, _SA(&ss), &slen, 0) == -1)
439: return -1;
1.4 dtucker 440: if (p == NULL || len == 0)
1.1 dtucker 441: return -1;
442: if (getnameinfo(_SA(&ss), slen, p, len, NULL, 0,
1.7 djm 443: NI_NUMERICHOST) != 0)
1.1 dtucker 444: return -1;
445:
446: return 0;
447: }
448:
449: /*
450: * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
451: * Return -1 on parse error, -2 on inconsistency or 0 on success.
452: */
453: int
454: addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
455: {
456: struct xaddr tmp;
1.8 ! deraadt 457: u_int masklen = 999;
! 458: char addrbuf[64], *mp;
! 459: const char *errstr;
1.1 dtucker 460:
461: /* Don't modify argument */
462: if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) >= sizeof(addrbuf))
463: return -1;
464:
465: if ((mp = strchr(addrbuf, '/')) != NULL) {
466: *mp = '\0';
467: mp++;
1.8 ! deraadt 468: masklen = (u_int)strtonum(mp, 0, INT_MAX, &errstr);
! 469: if (errstr)
1.1 dtucker 470: return -1;
471: }
472:
473: if (addr_pton(addrbuf, &tmp) == -1)
474: return -1;
475:
476: if (mp == NULL)
477: masklen = addr_unicast_masklen(tmp.af);
478: if (masklen_valid(tmp.af, masklen) == -1)
479: return -2;
480: if (addr_host_is_all0s(&tmp, masklen) != 0)
481: return -2;
482:
483: if (n != NULL)
484: memcpy(n, &tmp, sizeof(*n));
485: if (l != NULL)
486: *l = masklen;
487:
488: return 0;
489: }
490:
491: int
492: addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
493: {
494: struct xaddr tmp_mask, tmp_result;
495:
496: if (host->af != net->af)
497: return -1;
498:
499: if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
500: return -1;
501: if (addr_and(&tmp_result, host, &tmp_mask) == -1)
502: return -1;
503: return addr_cmp(&tmp_result, net);
504: }