1/* 2 * Copyright (C) 2004, 2005, 2007, 2010-2012 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 1999-2002 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or 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. 8 * 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. 16 */ 17 18/* $Id$ */ 19 20/*! \file */ 21 22#include <config.h> 23 24#include <stdio.h> 25 26#include <isc/buffer.h> 27#include <isc/msgs.h> 28#include <isc/net.h> 29#include <isc/netaddr.h> 30#include <isc/print.h> 31#include <isc/sockaddr.h> 32#include <isc/string.h> 33#include <isc/util.h> 34 35isc_boolean_t 36isc_netaddr_equal(const isc_netaddr_t *a, const isc_netaddr_t *b) { 37 REQUIRE(a != NULL && b != NULL); 38 39 if (a->family != b->family) 40 return (ISC_FALSE); 41 42 if (a->zone != b->zone) 43 return (ISC_FALSE); 44 45 switch (a->family) { 46 case AF_INET: 47 if (a->type.in.s_addr != b->type.in.s_addr) 48 return (ISC_FALSE); 49 break; 50 case AF_INET6: 51 if (memcmp(&a->type.in6, &b->type.in6, 52 sizeof(a->type.in6)) != 0 || 53 a->zone != b->zone) 54 return (ISC_FALSE); 55 break; 56#ifdef ISC_PLATFORM_HAVESYSUNH 57 case AF_UNIX: 58 if (strcmp(a->type.un, b->type.un) != 0) 59 return (ISC_FALSE); 60 break; 61#endif 62 default: 63 return (ISC_FALSE); 64 } 65 return (ISC_TRUE); 66} 67 68isc_boolean_t 69isc_netaddr_eqprefix(const isc_netaddr_t *a, const isc_netaddr_t *b, 70 unsigned int prefixlen) 71{ 72 const unsigned char *pa = NULL, *pb = NULL; 73 unsigned int ipabytes = 0; /* 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 */ 76 77 REQUIRE(a != NULL && b != NULL); 78 79 if (a->family != b->family) 80 return (ISC_FALSE); 81 82 if (a->zone != b->zone && b->zone != 0) 83 return (ISC_FALSE); 84 85 switch (a->family) { 86 case AF_INET: 87 pa = (const unsigned char *) &a->type.in; 88 pb = (const unsigned char *) &b->type.in; 89 ipabytes = 4; 90 break; 91 case AF_INET6: 92 pa = (const unsigned char *) &a->type.in6; 93 pb = (const unsigned char *) &b->type.in6; 94 ipabytes = 16; 95 break; 96 default: 97 return (ISC_FALSE); 98 } 99 100 /* 101 * Don't crash if we get a pattern like 10.0.0.1/9999999. 102 */ 103 if (prefixlen > ipabytes * 8) 104 prefixlen = ipabytes * 8; 105 106 nbytes = prefixlen / 8; 107 nbits = prefixlen % 8; 108 109 if (nbytes > 0) { 110 if (memcmp(pa, pb, nbytes) != 0) 111 return (ISC_FALSE); 112 } 113 if (nbits > 0) { 114 unsigned int bytea, byteb, mask; 115 INSIST(nbytes < ipabytes); 116 INSIST(nbits < 8); 117 bytea = pa[nbytes]; 118 byteb = pb[nbytes]; 119 mask = (0xFF << (8-nbits)) & 0xFF; 120 if ((bytea & mask) != (byteb & mask)) 121 return (ISC_FALSE); 122 } 123 return (ISC_TRUE); 124} 125 126isc_result_t 127isc_netaddr_totext(const isc_netaddr_t *netaddr, isc_buffer_t *target) { 128 char abuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; 129 char zbuf[sizeof("%4294967295")]; 130 unsigned int alen; 131 int zlen; 132 const char *r; 133 const void *type; 134 135 REQUIRE(netaddr != NULL); 136 137 switch (netaddr->family) { 138 case AF_INET: 139 type = &netaddr->type.in; 140 break; 141 case AF_INET6: 142 type = &netaddr->type.in6; 143 break; 144#ifdef ISC_PLATFORM_HAVESYSUNH 145 case AF_UNIX: 146 alen = strlen(netaddr->type.un); 147 if (alen > isc_buffer_availablelength(target)) 148 return (ISC_R_NOSPACE); 149 isc_buffer_putmem(target, 150 (const unsigned char *)(netaddr->type.un), 151 alen); 152 return (ISC_R_SUCCESS); 153#endif 154 default: 155 return (ISC_R_FAILURE); 156 } 157 r = inet_ntop(netaddr->family, type, abuf, sizeof(abuf)); 158 if (r == NULL) 159 return (ISC_R_FAILURE); 160 161 alen = strlen(abuf); 162 INSIST(alen < sizeof(abuf)); 163 164 zlen = 0; 165 if (netaddr->family == AF_INET6 && netaddr->zone != 0) { 166 zlen = snprintf(zbuf, sizeof(zbuf), "%%%u", netaddr->zone); 167 if (zlen < 0) 168 return (ISC_R_FAILURE); 169 INSIST((unsigned int)zlen < sizeof(zbuf)); 170 } 171 172 if (alen + zlen > isc_buffer_availablelength(target)) 173 return (ISC_R_NOSPACE); 174 175 isc_buffer_putmem(target, (unsigned char *)abuf, alen); 176 isc_buffer_putmem(target, (unsigned char *)zbuf, zlen); 177 178 return (ISC_R_SUCCESS); 179} 180 181void 182isc_netaddr_format(const isc_netaddr_t *na, char *array, unsigned int size) { 183 isc_result_t result; 184 isc_buffer_t buf; 185 186 isc_buffer_init(&buf, array, size); 187 result = isc_netaddr_totext(na, &buf); 188 189 if (size == 0) 190 return; 191 192 /* 193 * Null terminate. 194 */ 195 if (result == ISC_R_SUCCESS) { 196 if (isc_buffer_availablelength(&buf) >= 1) 197 isc_buffer_putuint8(&buf, 0); 198 else 199 result = ISC_R_NOSPACE; 200 } 201 202 if (result != ISC_R_SUCCESS) { 203 snprintf(array, size, 204 isc_msgcat_get(isc_msgcat, ISC_MSGSET_NETADDR, 205 ISC_MSG_UNKNOWNADDR, 206 "<unknown address, family %u>"), 207 na->family); 208 array[size - 1] = '\0'; 209 } 210} 211 212 213isc_result_t 214isc_netaddr_prefixok(const isc_netaddr_t *na, unsigned int prefixlen) { 215 static const unsigned char zeros[16]; 216 unsigned int nbits, nbytes, ipbytes = 0; 217 const unsigned char *p; 218 219 switch (na->family) { 220 case AF_INET: 221 p = (const unsigned char *) &na->type.in; 222 ipbytes = 4; 223 if (prefixlen > 32) 224 return (ISC_R_RANGE); 225 break; 226 case AF_INET6: 227 p = (const unsigned char *) &na->type.in6; 228 ipbytes = 16; 229 if (prefixlen > 128) 230 return (ISC_R_RANGE); 231 break; 232 default: 233 return (ISC_R_NOTIMPLEMENTED); 234 } 235 nbytes = prefixlen / 8; 236 nbits = prefixlen % 8; 237 if (nbits != 0) { 238 if ((p[nbytes] & (0xff>>nbits)) != 0U) 239 return (ISC_R_FAILURE); 240 nbytes++; 241 } 242 if (memcmp(p + nbytes, zeros, ipbytes - nbytes) != 0) 243 return (ISC_R_FAILURE); 244 return (ISC_R_SUCCESS); 245} 246 247isc_result_t 248isc_netaddr_masktoprefixlen(const isc_netaddr_t *s, unsigned int *lenp) { 249 unsigned int nbits = 0, nbytes = 0, ipbytes = 0, i; 250 const unsigned char *p; 251 252 switch (s->family) { 253 case AF_INET: 254 p = (const unsigned char *) &s->type.in; 255 ipbytes = 4; 256 break; 257 case AF_INET6: 258 p = (const unsigned char *) &s->type.in6; 259 ipbytes = 16; 260 break; 261 default: 262 return (ISC_R_NOTIMPLEMENTED); 263 } 264 for (i = 0; i < ipbytes; i++) { 265 if (p[i] != 0xFF) 266 break; 267 } 268 nbytes = i; 269 if (i < ipbytes) { 270 unsigned int c = p[nbytes]; 271 while ((c & 0x80) != 0 && nbits < 8) { 272 c <<= 1; nbits++; 273 } 274 if ((c & 0xFF) != 0) 275 return (ISC_R_MASKNONCONTIG); 276 i++; 277 } 278 for (; i < ipbytes; i++) { 279 if (p[i] != 0) 280 return (ISC_R_MASKNONCONTIG); 281 i++; 282 } 283 *lenp = nbytes * 8 + nbits; 284 return (ISC_R_SUCCESS); 285} 286 287void 288isc_netaddr_fromin(isc_netaddr_t *netaddr, const struct in_addr *ina) { 289 memset(netaddr, 0, sizeof(*netaddr)); 290 netaddr->family = AF_INET; 291 netaddr->type.in = *ina; 292} 293 294void 295isc_netaddr_fromin6(isc_netaddr_t *netaddr, const struct in6_addr *ina6) { 296 memset(netaddr, 0, sizeof(*netaddr)); 297 netaddr->family = AF_INET6; 298 netaddr->type.in6 = *ina6; 299} 300 301isc_result_t 302isc_netaddr_frompath(isc_netaddr_t *netaddr, const char *path) { 303#ifdef ISC_PLATFORM_HAVESYSUNH 304 if (strlen(path) > sizeof(netaddr->type.un) - 1) 305 return (ISC_R_NOSPACE); 306 307 memset(netaddr, 0, sizeof(*netaddr)); 308 netaddr->family = AF_UNIX; 309 strcpy(netaddr->type.un, path); 310 netaddr->zone = 0; 311 return (ISC_R_SUCCESS); 312#else 313 UNUSED(netaddr); 314 UNUSED(path); 315 return (ISC_R_NOTIMPLEMENTED); 316#endif 317} 318 319 320void 321isc_netaddr_setzone(isc_netaddr_t *netaddr, isc_uint32_t zone) { 322 /* we currently only support AF_INET6. */ 323 REQUIRE(netaddr->family == AF_INET6); 324 325 netaddr->zone = zone; 326} 327 328isc_uint32_t 329isc_netaddr_getzone(const isc_netaddr_t *netaddr) { 330 return (netaddr->zone); 331} 332 333void 334isc_netaddr_fromsockaddr(isc_netaddr_t *t, const isc_sockaddr_t *s) { 335 int family = s->type.sa.sa_family; 336 t->family = family; 337 switch (family) { 338 case AF_INET: 339 t->type.in = s->type.sin.sin_addr; 340 t->zone = 0; 341 break; 342 case AF_INET6: 343 memcpy(&t->type.in6, &s->type.sin6.sin6_addr, 16); 344#ifdef ISC_PLATFORM_HAVESCOPEID 345 t->zone = s->type.sin6.sin6_scope_id; 346#else 347 t->zone = 0; 348#endif 349 break; 350#ifdef ISC_PLATFORM_HAVESYSUNH 351 case AF_UNIX: 352 memcpy(t->type.un, s->type.sunix.sun_path, sizeof(t->type.un)); 353 t->zone = 0; 354 break; 355#endif 356 default: 357 INSIST(0); 358 } 359} 360 361void 362isc_netaddr_any(isc_netaddr_t *netaddr) { 363 memset(netaddr, 0, sizeof(*netaddr)); 364 netaddr->family = AF_INET; 365 netaddr->type.in.s_addr = INADDR_ANY; 366} 367 368void 369isc_netaddr_any6(isc_netaddr_t *netaddr) { 370 memset(netaddr, 0, sizeof(*netaddr)); 371 netaddr->family = AF_INET6; 372 netaddr->type.in6 = in6addr_any; 373} 374 375isc_boolean_t 376isc_netaddr_ismulticast(isc_netaddr_t *na) { 377 switch (na->family) { 378 case AF_INET: 379 return (ISC_TF(ISC_IPADDR_ISMULTICAST(na->type.in.s_addr))); 380 case AF_INET6: 381 return (ISC_TF(IN6_IS_ADDR_MULTICAST(&na->type.in6))); 382 default: 383 return (ISC_FALSE); /* XXXMLG ? */ 384 } 385} 386 387isc_boolean_t 388isc_netaddr_isexperimental(isc_netaddr_t *na) { 389 switch (na->family) { 390 case AF_INET: 391 return (ISC_TF(ISC_IPADDR_ISEXPERIMENTAL(na->type.in.s_addr))); 392 default: 393 return (ISC_FALSE); /* XXXMLG ? */ 394 } 395} 396 397isc_boolean_t 398isc_netaddr_islinklocal(isc_netaddr_t *na) { 399 switch (na->family) { 400 case AF_INET: 401 return (ISC_FALSE); 402 case AF_INET6: 403 return (ISC_TF(IN6_IS_ADDR_LINKLOCAL(&na->type.in6))); 404 default: 405 return (ISC_FALSE); 406 } 407} 408 409isc_boolean_t 410isc_netaddr_issitelocal(isc_netaddr_t *na) { 411 switch (na->family) { 412 case AF_INET: 413 return (ISC_FALSE); 414 case AF_INET6: 415 return (ISC_TF(IN6_IS_ADDR_SITELOCAL(&na->type.in6))); 416 default: 417 return (ISC_FALSE); 418 } 419} 420 421void 422isc_netaddr_fromv4mapped(isc_netaddr_t *t, const isc_netaddr_t *s) { 423 isc_netaddr_t *src; 424 425 DE_CONST(s, src); /* Must come before IN6_IS_ADDR_V4MAPPED. */ 426 427 REQUIRE(s->family == AF_INET6); 428 REQUIRE(IN6_IS_ADDR_V4MAPPED(&src->type.in6)); 429 430 memset(t, 0, sizeof(*t)); 431 t->family = AF_INET; 432 memcpy(&t->type.in, (char *)&src->type.in6 + 12, 4); 433 return; 434} 435