2 * Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2002 Internet Software Consortium.
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
18 /* $Id: netaddr.c,v 1.27.18.8 2005/04/27 05:02:03 sra Exp $ */
26 #include <isc/buffer.h>
29 #include <isc/netaddr.h>
30 #include <isc/print.h>
31 #include <isc/sockaddr.h>
32 #include <isc/string.h>
36 isc_netaddr_equal(const isc_netaddr_t *a, const isc_netaddr_t *b) {
37 REQUIRE(a != NULL && b != NULL);
39 if (a->family != b->family)
42 if (a->zone != b->zone)
47 if (a->type.in.s_addr != b->type.in.s_addr)
51 if (memcmp(&a->type.in6, &b->type.in6,
52 sizeof(a->type.in6)) != 0 ||
56 #ifdef ISC_PLATFORM_HAVESYSUNH
58 if (strcmp(a->type.un, b->type.un) != 0)
69 isc_netaddr_eqprefix(const isc_netaddr_t *a, const isc_netaddr_t *b,
70 unsigned int prefixlen)
72 const unsigned char *pa, *pb;
73 unsigned int ipabytes; /* Length of whole IP address in bytes */
74 unsigned int nbytes; /* Number of significant whole bytes */
75 unsigned int nbits; /* Number of significant leftover bits */
77 REQUIRE(a != NULL && b != NULL);
79 if (a->family != b->family)
82 if (a->zone != b->zone)
87 pa = (const unsigned char *) &a->type.in;
88 pb = (const unsigned char *) &b->type.in;
92 pa = (const unsigned char *) &a->type.in6;
93 pb = (const unsigned char *) &b->type.in6;
97 pa = pb = NULL; /* Avoid silly compiler warning. */
98 ipabytes = 0; /* Ditto. */
103 * Don't crash if we get a pattern like 10.0.0.1/9999999.
105 if (prefixlen > ipabytes * 8)
106 prefixlen = ipabytes * 8;
108 nbytes = prefixlen / 8;
109 nbits = prefixlen % 8;
112 if (memcmp(pa, pb, nbytes) != 0)
116 unsigned int bytea, byteb, mask;
117 INSIST(nbytes < ipabytes);
121 mask = (0xFF << (8-nbits)) & 0xFF;
122 if ((bytea & mask) != (byteb & mask))
129 isc_netaddr_totext(const isc_netaddr_t *netaddr, isc_buffer_t *target) {
130 char abuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
131 char zbuf[sizeof("%4294967295")];
137 REQUIRE(netaddr != NULL);
139 switch (netaddr->family) {
141 type = &netaddr->type.in;
144 type = &netaddr->type.in6;
146 #ifdef ISC_PLATFORM_HAVESYSUNH
148 alen = strlen(netaddr->type.un);
149 if (alen > isc_buffer_availablelength(target))
150 return (ISC_R_NOSPACE);
151 isc_buffer_putmem(target,
152 (const unsigned char *)(netaddr->type.un),
154 return (ISC_R_SUCCESS);
157 return (ISC_R_FAILURE);
159 r = inet_ntop(netaddr->family, type, abuf, sizeof(abuf));
161 return (ISC_R_FAILURE);
164 INSIST(alen < sizeof(abuf));
167 if (netaddr->family == AF_INET6 && netaddr->zone != 0) {
168 zlen = snprintf(zbuf, sizeof(zbuf), "%%%u", netaddr->zone);
170 return (ISC_R_FAILURE);
171 INSIST((unsigned int)zlen < sizeof(zbuf));
174 if (alen + zlen > isc_buffer_availablelength(target))
175 return (ISC_R_NOSPACE);
177 isc_buffer_putmem(target, (unsigned char *)abuf, alen);
178 isc_buffer_putmem(target, (unsigned char *)zbuf, zlen);
180 return (ISC_R_SUCCESS);
184 isc_netaddr_format(const isc_netaddr_t *na, char *array, unsigned int size) {
188 isc_buffer_init(&buf, array, size);
189 result = isc_netaddr_totext(na, &buf);
194 if (result == ISC_R_SUCCESS) {
195 if (isc_buffer_availablelength(&buf) >= 1)
196 isc_buffer_putuint8(&buf, 0);
198 result = ISC_R_NOSPACE;
201 if (result != ISC_R_SUCCESS) {
202 snprintf(array, size,
203 isc_msgcat_get(isc_msgcat, ISC_MSGSET_NETADDR,
205 "<unknown address, family %u>"),
207 array[size - 1] = '\0';
213 isc_netaddr_prefixok(const isc_netaddr_t *na, unsigned int prefixlen) {
214 static const unsigned char zeros[16];
215 unsigned int nbits, nbytes, ipbytes;
216 const unsigned char *p;
218 switch (na->family) {
220 p = (const unsigned char *) &na->type.in;
223 return (ISC_R_RANGE);
226 p = (const unsigned char *) &na->type.in6;
229 return (ISC_R_RANGE);
233 return (ISC_R_NOTIMPLEMENTED);
235 nbytes = prefixlen / 8;
236 nbits = prefixlen % 8;
238 if ((p[nbytes] & (0xff>>nbits)) != 0U)
239 return (ISC_R_FAILURE);
242 if (memcmp(p + nbytes, zeros, ipbytes - nbytes) != 0)
243 return (ISC_R_FAILURE);
244 return (ISC_R_SUCCESS);
248 isc_netaddr_masktoprefixlen(const isc_netaddr_t *s, unsigned int *lenp) {
249 unsigned int nbits, nbytes, ipbytes, i;
250 const unsigned char *p;
254 p = (const unsigned char *) &s->type.in;
258 p = (const unsigned char *) &s->type.in6;
263 return (ISC_R_NOTIMPLEMENTED);
266 for (i = 0; i < ipbytes; i++) {
272 unsigned int c = p[nbytes];
273 while ((c & 0x80) != 0 && nbits < 8) {
277 return (ISC_R_MASKNONCONTIG);
280 for (; i < ipbytes; i++) {
282 return (ISC_R_MASKNONCONTIG);
285 *lenp = nbytes * 8 + nbits;
286 return (ISC_R_SUCCESS);
290 isc_netaddr_fromin(isc_netaddr_t *netaddr, const struct in_addr *ina) {
291 memset(netaddr, 0, sizeof(*netaddr));
292 netaddr->family = AF_INET;
293 netaddr->type.in = *ina;
297 isc_netaddr_fromin6(isc_netaddr_t *netaddr, const struct in6_addr *ina6) {
298 memset(netaddr, 0, sizeof(*netaddr));
299 netaddr->family = AF_INET6;
300 netaddr->type.in6 = *ina6;
304 isc_netaddr_frompath(isc_netaddr_t *netaddr, const char *path) {
305 #ifdef ISC_PLATFORM_HAVESYSUNH
306 if (strlen(path) > sizeof(netaddr->type.un) - 1)
307 return (ISC_R_NOSPACE);
309 memset(netaddr, 0, sizeof(*netaddr));
310 netaddr->family = AF_UNIX;
311 strcpy(netaddr->type.un, path);
313 return (ISC_R_SUCCESS);
317 return (ISC_R_NOTIMPLEMENTED);
323 isc_netaddr_setzone(isc_netaddr_t *netaddr, isc_uint32_t zone) {
324 /* we currently only support AF_INET6. */
325 REQUIRE(netaddr->family == AF_INET6);
327 netaddr->zone = zone;
331 isc_netaddr_getzone(const isc_netaddr_t *netaddr) {
332 return (netaddr->zone);
336 isc_netaddr_fromsockaddr(isc_netaddr_t *t, const isc_sockaddr_t *s) {
337 int family = s->type.sa.sa_family;
341 t->type.in = s->type.sin.sin_addr;
345 memcpy(&t->type.in6, &s->type.sin6.sin6_addr, 16);
346 #ifdef ISC_PLATFORM_HAVESCOPEID
347 t->zone = s->type.sin6.sin6_scope_id;
352 #ifdef ISC_PLATFORM_HAVESYSUNH
354 memcpy(t->type.un, s->type.sunix.sun_path, sizeof(t->type.un));
364 isc_netaddr_any(isc_netaddr_t *netaddr) {
365 memset(netaddr, 0, sizeof(*netaddr));
366 netaddr->family = AF_INET;
367 netaddr->type.in.s_addr = INADDR_ANY;
371 isc_netaddr_any6(isc_netaddr_t *netaddr) {
372 memset(netaddr, 0, sizeof(*netaddr));
373 netaddr->family = AF_INET6;
374 netaddr->type.in6 = in6addr_any;
378 isc_netaddr_ismulticast(isc_netaddr_t *na) {
379 switch (na->family) {
381 return (ISC_TF(ISC_IPADDR_ISMULTICAST(na->type.in.s_addr)));
383 return (ISC_TF(IN6_IS_ADDR_MULTICAST(&na->type.in6)));
385 return (ISC_FALSE); /* XXXMLG ? */
390 isc_netaddr_isexperimental(isc_netaddr_t *na) {
391 switch (na->family) {
393 return (ISC_TF(ISC_IPADDR_ISEXPERIMENTAL(na->type.in.s_addr)));
395 return (ISC_FALSE); /* XXXMLG ? */
400 isc_netaddr_islinklocal(isc_netaddr_t *na) {
401 switch (na->family) {
405 return (ISC_TF(IN6_IS_ADDR_LINKLOCAL(&na->type.in6)));
412 isc_netaddr_issitelocal(isc_netaddr_t *na) {
413 switch (na->family) {
417 return (ISC_TF(IN6_IS_ADDR_SITELOCAL(&na->type.in6)));
424 isc_netaddr_fromv4mapped(isc_netaddr_t *t, const isc_netaddr_t *s) {
427 DE_CONST(s, src); /* Must come before IN6_IS_ADDR_V4MAPPED. */
429 REQUIRE(s->family == AF_INET6);
430 REQUIRE(IN6_IS_ADDR_V4MAPPED(&src->type.in6));
432 memset(t, 0, sizeof(*t));
434 memcpy(&t->type.in, (char *)&src->type.in6 + 12, 4);