contrib/bind-9.5.2/lib/isc/sockaddr.c

   1 /*
   2  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2003  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: sockaddr.c,v 1.70 2007/06/19 23:47:17 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <stdio.h>
  25
  26 #include <isc/buffer.h>
  27 #include <isc/hash.h>
  28 #include <isc/msgs.h>
  29 #include <isc/netaddr.h>
  30 #include <isc/print.h>
  31 #include <isc/region.h>
  32 #include <isc/sockaddr.h>
  33 #include <isc/string.h>
  34 #include <isc/util.h>
  35
  36 isc_boolean_t
  37 isc_sockaddr_equal(const isc_sockaddr_t *a, const isc_sockaddr_t *b) {
  38         return (isc_sockaddr_compare(a, b, ISC_SOCKADDR_CMPADDR|
  39                                            ISC_SOCKADDR_CMPPORT|
  40                                            ISC_SOCKADDR_CMPSCOPE));
  41 }
  42
  43 isc_boolean_t
  44 isc_sockaddr_eqaddr(const isc_sockaddr_t *a, const isc_sockaddr_t *b) {
  45         return (isc_sockaddr_compare(a, b, ISC_SOCKADDR_CMPADDR|
  46                                            ISC_SOCKADDR_CMPSCOPE));
  47 }
  48
  49 isc_boolean_t
  50 isc_sockaddr_compare(const isc_sockaddr_t *a, const isc_sockaddr_t *b,
  51                      unsigned int flags)
  52 {
  53         REQUIRE(a != NULL && b != NULL);
  54
  55         if (a->length != b->length)
  56                 return (ISC_FALSE);
  57
  58         /*
  59          * We don't just memcmp because the sin_zero field isn't always
  60          * zero.
  61          */
  62
  63         if (a->type.sa.sa_family != b->type.sa.sa_family)
  64                 return (ISC_FALSE);
  65         switch (a->type.sa.sa_family) {
  66         case AF_INET:
  67                 if ((flags & ISC_SOCKADDR_CMPADDR) != 0 &&
  68                     memcmp(&a->type.sin.sin_addr, &b->type.sin.sin_addr,
  69                            sizeof(a->type.sin.sin_addr)) != 0)
  70                         return (ISC_FALSE);
  71                 if ((flags & ISC_SOCKADDR_CMPPORT) != 0 &&
  72                     a->type.sin.sin_port != b->type.sin.sin_port)
  73                         return (ISC_FALSE);
  74                 break;
  75         case AF_INET6:
  76                 if ((flags & ISC_SOCKADDR_CMPADDR) != 0 &&
  77                     memcmp(&a->type.sin6.sin6_addr, &b->type.sin6.sin6_addr,
  78                            sizeof(a->type.sin6.sin6_addr)) != 0)
  79                         return (ISC_FALSE);
  80 #ifdef ISC_PLATFORM_HAVESCOPEID
  81                 /*
  82                  * If ISC_SOCKADDR_CMPSCOPEZERO is set then don't return
  83                  * ISC_FALSE if one of the scopes in zero.
  84                  */
  85                 if ((flags & ISC_SOCKADDR_CMPSCOPE) != 0 &&
  86                     a->type.sin6.sin6_scope_id != b->type.sin6.sin6_scope_id &&
  87                     ((flags & ISC_SOCKADDR_CMPSCOPEZERO) == 0 ||
  88                       (a->type.sin6.sin6_scope_id != 0 &&
  89                        b->type.sin6.sin6_scope_id != 0)))
  90                         return (ISC_FALSE);
  91 #endif
  92                 if ((flags & ISC_SOCKADDR_CMPPORT) != 0 &&
  93                     a->type.sin6.sin6_port != b->type.sin6.sin6_port)
  94                         return (ISC_FALSE);
  95                 break;
  96         default:
  97                 if (memcmp(&a->type, &b->type, a->length) != 0)
  98                         return (ISC_FALSE);
  99         }
 100         return (ISC_TRUE);
 101 }
 102
 103 isc_boolean_t
 104 isc_sockaddr_eqaddrprefix(const isc_sockaddr_t *a, const isc_sockaddr_t *b,
 105                           unsigned int prefixlen)
 106 {
 107         isc_netaddr_t na, nb;
 108         isc_netaddr_fromsockaddr(&na, a);
 109         isc_netaddr_fromsockaddr(&nb, b);
 110         return (isc_netaddr_eqprefix(&na, &nb, prefixlen));
 111 }
 112
 113 isc_result_t
 114 isc_sockaddr_totext(const isc_sockaddr_t *sockaddr, isc_buffer_t *target) {
 115         isc_result_t result;
 116         isc_netaddr_t netaddr;
 117         char pbuf[sizeof("65000")];
 118         unsigned int plen;
 119         isc_region_t avail;
 120
 121         REQUIRE(sockaddr != NULL);
 122
 123         /*
 124          * Do the port first, giving us the opportunity to check for
 125          * unsupported address families before calling
 126          * isc_netaddr_fromsockaddr().
 127          */
 128         switch (sockaddr->type.sa.sa_family) {
 129         case AF_INET:
 130                 snprintf(pbuf, sizeof(pbuf), "%u", ntohs(sockaddr->type.sin.sin_port));
 131                 break;
 132         case AF_INET6:
 133                 snprintf(pbuf, sizeof(pbuf), "%u", ntohs(sockaddr->type.sin6.sin6_port));
 134                 break;
 135 #ifdef ISC_PLAFORM_HAVESYSUNH
 136         case AF_UNIX:
 137                 plen = strlen(sockaddr->type.sunix.sun_path);
 138                 if (plen >= isc_buffer_availablelength(target))
 139                         return (ISC_R_NOSPACE);
 140
 141                 isc_buffer_putmem(target, sockaddr->type.sunix.sun_path, plen);
 142
 143                 /*
 144                  * Null terminate after used region.
 145                  */
 146                 isc_buffer_availableregion(target, &avail);
 147                 INSIST(avail.length >= 1);
 148                 avail.base[0] = '\0';
 149
 150                 return (ISC_R_SUCCESS);
 151 #endif
 152         default:
 153                 return (ISC_R_FAILURE);
 154         }
 155
 156         plen = strlen(pbuf);
 157         INSIST(plen < sizeof(pbuf));
 158
 159         isc_netaddr_fromsockaddr(&netaddr, sockaddr);
 160         result = isc_netaddr_totext(&netaddr, target);
 161         if (result != ISC_R_SUCCESS)
 162                 return (result);
 163
 164         if (1 + plen + 1 > isc_buffer_availablelength(target))
 165                 return (ISC_R_NOSPACE);
 166
 167         isc_buffer_putmem(target, (const unsigned char *)"#", 1);
 168         isc_buffer_putmem(target, (const unsigned char *)pbuf, plen);
 169
 170         /*
 171          * Null terminate after used region.
 172          */
 173         isc_buffer_availableregion(target, &avail);
 174         INSIST(avail.length >= 1);
 175         avail.base[0] = '\0';
 176
 177         return (ISC_R_SUCCESS);
 178 }
 179
 180 void
 181 isc_sockaddr_format(const isc_sockaddr_t *sa, char *array, unsigned int size) {
 182         isc_result_t result;
 183         isc_buffer_t buf;
 184
 185         isc_buffer_init(&buf, array, size);
 186         result = isc_sockaddr_totext(sa, &buf);
 187         if (result != ISC_R_SUCCESS) {
 188                 /*
 189                  * The message is the same as in netaddr.c.
 190                  */
 191                 snprintf(array, size,
 192                          isc_msgcat_get(isc_msgcat, ISC_MSGSET_NETADDR,
 193                                         ISC_MSG_UNKNOWNADDR,
 194                                         "<unknown address, family %u>"),
 195                          sa->type.sa.sa_family);
 196                 array[size - 1] = '\0';
 197         }
 198 }
 199
 200 unsigned int
 201 isc_sockaddr_hash(const isc_sockaddr_t *sockaddr, isc_boolean_t address_only) {
 202         unsigned int length = 0;
 203         const unsigned char *s = NULL;
 204         unsigned int h = 0;
 205         unsigned int g;
 206         unsigned int p = 0;
 207         const struct in6_addr *in6;
 208
 209         REQUIRE(sockaddr != NULL);
 210
 211         switch (sockaddr->type.sa.sa_family) {
 212         case AF_INET:
 213                 s = (const unsigned char *)&sockaddr->type.sin.sin_addr;
 214                 p = ntohs(sockaddr->type.sin.sin_port);
 215                 length = sizeof(sockaddr->type.sin.sin_addr.s_addr);
 216                 break;
 217         case AF_INET6:
 218                 in6 = &sockaddr->type.sin6.sin6_addr;
 219                 if (IN6_IS_ADDR_V4MAPPED(in6)) {
 220                         s = (const unsigned char *)&in6[12];
 221                         length = sizeof(sockaddr->type.sin.sin_addr.s_addr);
 222                 } else {
 223                         s = (const unsigned char *)in6;
 224                         length = sizeof(sockaddr->type.sin6.sin6_addr);
 225                 }
 226                 p = ntohs(sockaddr->type.sin6.sin6_port);
 227                 break;
 228         default:
 229                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 230                                  isc_msgcat_get(isc_msgcat,
 231                                                 ISC_MSGSET_SOCKADDR,
 232                                                 ISC_MSG_UNKNOWNFAMILY,
 233                                                 "unknown address family: %d"),
 234                                              (int)sockaddr->type.sa.sa_family);
 235                 s = (const unsigned char *)&sockaddr->type;
 236                 length = sockaddr->length;
 237                 p = 0;
 238         }
 239
 240         h = isc_hash_calc(s, length, ISC_TRUE);
 241         if (!address_only) {
 242                 g = isc_hash_calc((const unsigned char *)&p, sizeof(p),
 243                                   ISC_TRUE);
 244                 h = h ^ g; /* XXX: we should concatenate h and p first */
 245         }
 246
 247         return (h);
 248 }
 249
 250 void
 251 isc_sockaddr_any(isc_sockaddr_t *sockaddr)
 252 {
 253         memset(sockaddr, 0, sizeof(*sockaddr));
 254         sockaddr->type.sin.sin_family = AF_INET;
 255 #ifdef ISC_PLATFORM_HAVESALEN
 256         sockaddr->type.sin.sin_len = sizeof(sockaddr->type.sin);
 257 #endif
 258         sockaddr->type.sin.sin_addr.s_addr = INADDR_ANY;
 259         sockaddr->type.sin.sin_port = 0;
 260         sockaddr->length = sizeof(sockaddr->type.sin);
 261         ISC_LINK_INIT(sockaddr, link);
 262 }
 263
 264 void
 265 isc_sockaddr_any6(isc_sockaddr_t *sockaddr)
 266 {
 267         memset(sockaddr, 0, sizeof(*sockaddr));
 268         sockaddr->type.sin6.sin6_family = AF_INET6;
 269 #ifdef ISC_PLATFORM_HAVESALEN
 270         sockaddr->type.sin6.sin6_len = sizeof(sockaddr->type.sin6);
 271 #endif
 272         sockaddr->type.sin6.sin6_addr = in6addr_any;
 273         sockaddr->type.sin6.sin6_port = 0;
 274         sockaddr->length = sizeof(sockaddr->type.sin6);
 275         ISC_LINK_INIT(sockaddr, link);
 276 }
 277
 278 void
 279 isc_sockaddr_fromin(isc_sockaddr_t *sockaddr, const struct in_addr *ina,
 280                     in_port_t port)
 281 {
 282         memset(sockaddr, 0, sizeof(*sockaddr));
 283         sockaddr->type.sin.sin_family = AF_INET;
 284 #ifdef ISC_PLATFORM_HAVESALEN
 285         sockaddr->type.sin.sin_len = sizeof(sockaddr->type.sin);
 286 #endif
 287         sockaddr->type.sin.sin_addr = *ina;
 288         sockaddr->type.sin.sin_port = htons(port);
 289         sockaddr->length = sizeof(sockaddr->type.sin);
 290         ISC_LINK_INIT(sockaddr, link);
 291 }
 292
 293 void
 294 isc_sockaddr_anyofpf(isc_sockaddr_t *sockaddr, int pf) {
 295      switch (pf) {
 296      case AF_INET:
 297              isc_sockaddr_any(sockaddr);
 298              break;
 299      case AF_INET6:
 300              isc_sockaddr_any6(sockaddr);
 301              break;
 302      default:
 303              INSIST(0);
 304      }
 305 }
 306
 307 void
 308 isc_sockaddr_fromin6(isc_sockaddr_t *sockaddr, const struct in6_addr *ina6,
 309                      in_port_t port)
 310 {
 311         memset(sockaddr, 0, sizeof(*sockaddr));
 312         sockaddr->type.sin6.sin6_family = AF_INET6;
 313 #ifdef ISC_PLATFORM_HAVESALEN
 314         sockaddr->type.sin6.sin6_len = sizeof(sockaddr->type.sin6);
 315 #endif
 316         sockaddr->type.sin6.sin6_addr = *ina6;
 317         sockaddr->type.sin6.sin6_port = htons(port);
 318         sockaddr->length = sizeof(sockaddr->type.sin6);
 319         ISC_LINK_INIT(sockaddr, link);
 320 }
 321
 322 void
 323 isc_sockaddr_v6fromin(isc_sockaddr_t *sockaddr, const struct in_addr *ina,
 324                       in_port_t port)
 325 {
 326         memset(sockaddr, 0, sizeof(*sockaddr));
 327         sockaddr->type.sin6.sin6_family = AF_INET6;
 328 #ifdef ISC_PLATFORM_HAVESALEN
 329         sockaddr->type.sin6.sin6_len = sizeof(sockaddr->type.sin6);
 330 #endif
 331         sockaddr->type.sin6.sin6_addr.s6_addr[10] = 0xff;
 332         sockaddr->type.sin6.sin6_addr.s6_addr[11] = 0xff;
 333         memcpy(&sockaddr->type.sin6.sin6_addr.s6_addr[12], ina, 4);
 334         sockaddr->type.sin6.sin6_port = htons(port);
 335         sockaddr->length = sizeof(sockaddr->type.sin6);
 336         ISC_LINK_INIT(sockaddr, link);
 337 }
 338
 339 int
 340 isc_sockaddr_pf(const isc_sockaddr_t *sockaddr) {
 341
 342         /*
 343          * Get the protocol family of 'sockaddr'.
 344          */
 345
 346 #if (AF_INET == PF_INET && AF_INET6 == PF_INET6)
 347         /*
 348          * Assume that PF_xxx == AF_xxx for all AF and PF.
 349          */
 350         return (sockaddr->type.sa.sa_family);
 351 #else
 352         switch (sockaddr->type.sa.sa_family) {
 353         case AF_INET:
 354                 return (PF_INET);
 355         case AF_INET6:
 356                 return (PF_INET6);
 357         default:
 358                 FATAL_ERROR(__FILE__, __LINE__,
 359                             isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKADDR,
 360                                            ISC_MSG_UNKNOWNFAMILY,
 361                                            "unknown address family: %d"),
 362                             (int)sockaddr->type.sa.sa_family);
 363         }
 364 #endif
 365 }
 366
 367 void
 368 isc_sockaddr_fromnetaddr(isc_sockaddr_t *sockaddr, const isc_netaddr_t *na,
 369                     in_port_t port)
 370 {
 371         memset(sockaddr, 0, sizeof(*sockaddr));
 372         sockaddr->type.sin.sin_family = na->family;
 373         switch (na->family) {
 374         case AF_INET:
 375                 sockaddr->length = sizeof(sockaddr->type.sin);
 376 #ifdef ISC_PLATFORM_HAVESALEN
 377                 sockaddr->type.sin.sin_len = sizeof(sockaddr->type.sin);
 378 #endif
 379                 sockaddr->type.sin.sin_addr = na->type.in;
 380                 sockaddr->type.sin.sin_port = htons(port);
 381                 break;
 382         case AF_INET6:
 383                 sockaddr->length = sizeof(sockaddr->type.sin6);
 384 #ifdef ISC_PLATFORM_HAVESALEN
 385                 sockaddr->type.sin6.sin6_len = sizeof(sockaddr->type.sin6);
 386 #endif
 387                 memcpy(&sockaddr->type.sin6.sin6_addr, &na->type.in6, 16);
 388 #ifdef ISC_PLATFORM_HAVESCOPEID
 389                 sockaddr->type.sin6.sin6_scope_id = isc_netaddr_getzone(na);
 390 #endif
 391                 sockaddr->type.sin6.sin6_port = htons(port);
 392                 break;
 393         default:
 394                 INSIST(0);
 395         }
 396         ISC_LINK_INIT(sockaddr, link);
 397 }
 398
 399 void
 400 isc_sockaddr_setport(isc_sockaddr_t *sockaddr, in_port_t port) {
 401         switch (sockaddr->type.sa.sa_family) {
 402         case AF_INET:
 403                 sockaddr->type.sin.sin_port = htons(port);
 404                 break;
 405         case AF_INET6:
 406                 sockaddr->type.sin6.sin6_port = htons(port);
 407                 break;
 408         default:
 409                 FATAL_ERROR(__FILE__, __LINE__,
 410                             isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKADDR,
 411                                            ISC_MSG_UNKNOWNFAMILY,
 412                                            "unknown address family: %d"),
 413                             (int)sockaddr->type.sa.sa_family);
 414         }
 415 }
 416
 417 in_port_t
 418 isc_sockaddr_getport(const isc_sockaddr_t *sockaddr) {
 419         in_port_t port = 0;
 420
 421         switch (sockaddr->type.sa.sa_family) {
 422         case AF_INET:
 423                 port = ntohs(sockaddr->type.sin.sin_port);
 424                 break;
 425         case AF_INET6:
 426                 port = ntohs(sockaddr->type.sin6.sin6_port);
 427                 break;
 428         default:
 429                 FATAL_ERROR(__FILE__, __LINE__,
 430                             isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKADDR,
 431                                            ISC_MSG_UNKNOWNFAMILY,
 432                                            "unknown address family: %d"),
 433                             (int)sockaddr->type.sa.sa_family);
 434         }
 435
 436         return (port);
 437 }
 438
 439 isc_boolean_t
 440 isc_sockaddr_ismulticast(const isc_sockaddr_t *sockaddr) {
 441         isc_netaddr_t netaddr;
 442
 443         if (sockaddr->type.sa.sa_family == AF_INET ||
 444             sockaddr->type.sa.sa_family == AF_INET6) {
 445                 isc_netaddr_fromsockaddr(&netaddr, sockaddr);
 446                 return (isc_netaddr_ismulticast(&netaddr));
 447         }
 448         return (ISC_FALSE);
 449 }
 450
 451 isc_boolean_t
 452 isc_sockaddr_isexperimental(const isc_sockaddr_t *sockaddr) {
 453         isc_netaddr_t netaddr;
 454
 455         if (sockaddr->type.sa.sa_family == AF_INET) {
 456                 isc_netaddr_fromsockaddr(&netaddr, sockaddr);
 457                 return (isc_netaddr_isexperimental(&netaddr));
 458         }
 459         return (ISC_FALSE);
 460 }
 461
 462 isc_boolean_t
 463 isc_sockaddr_issitelocal(const isc_sockaddr_t *sockaddr) {
 464         isc_netaddr_t netaddr;
 465
 466         if (sockaddr->type.sa.sa_family == AF_INET6) {
 467                 isc_netaddr_fromsockaddr(&netaddr, sockaddr);
 468                 return (isc_netaddr_issitelocal(&netaddr));
 469         }
 470         return (ISC_FALSE);
 471 }
 472
 473 isc_boolean_t
 474 isc_sockaddr_islinklocal(const isc_sockaddr_t *sockaddr) {
 475         isc_netaddr_t netaddr;
 476
 477         if (sockaddr->type.sa.sa_family == AF_INET6) {
 478                 isc_netaddr_fromsockaddr(&netaddr, sockaddr);
 479                 return (isc_netaddr_islinklocal(&netaddr));
 480         }
 481         return (ISC_FALSE);
 482 }
 483
 484 isc_result_t
 485 isc_sockaddr_frompath(isc_sockaddr_t *sockaddr, const char *path) {
 486 #ifdef ISC_PLATFORM_HAVESYSUNH
 487         if (strlen(path) >= sizeof(sockaddr->type.sunix.sun_path))
 488                 return (ISC_R_NOSPACE);
 489         memset(sockaddr, 0, sizeof(*sockaddr));
 490         sockaddr->length = sizeof(sockaddr->type.sunix);
 491         sockaddr->type.sunix.sun_family = AF_UNIX;
 492 #ifdef ISC_PLATFORM_HAVESALEN
 493         sockaddr->type.sunix.sun_len =
 494                         (unsigned char)sizeof(sockaddr->type.sunix);
 495 #endif
 496         strcpy(sockaddr->type.sunix.sun_path, path);
 497         return (ISC_R_SUCCESS);
 498 #else
 499         UNUSED(sockaddr);
 500         UNUSED(path);
 501         return (ISC_R_NOTIMPLEMENTED);
 502 #endif
 503 }