res_init.c revision 1.3
1 /* $NetBSD: res_init.c,v 1.3 2004/05/20 19:43:39 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 */ 55 56 /* 57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 59 * 60 * Permission to use, copy, modify, and distribute this software for any 61 * purpose with or without fee is hereby granted, provided that the above 62 * copyright notice and this permission notice appear in all copies. 63 * 64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #include <sys/cdefs.h> 74 #if defined(LIBC_SCCS) && !defined(lint) 75 #ifdef notdef 76 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 77 static const char rcsid[] = "Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_init.c,v 1.3 2004/05/20 19:43:39 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 85 #include <sys/types.h> 86 #include <sys/param.h> 87 #include <sys/socket.h> 88 #include <sys/time.h> 89 90 #include <netinet/in.h> 91 #include <arpa/inet.h> 92 #include <arpa/nameser.h> 93 94 #include <ctype.h> 95 #include <stdio.h> 96 #include <stdlib.h> 97 #include <string.h> 98 #include <unistd.h> 99 #include <netdb.h> 100 101 #include "port_after.h" 102 103 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 104 #include <resolv.h> 105 106 #include "res_private.h" 107 108 /* Options. Should all be left alone. */ 109 #define RESOLVSORT 110 #define DEBUG 111 112 static void res_setoptions __P((res_state, const char *, const char *)); 113 114 #ifdef RESOLVSORT 115 static const char sort_mask[] = "/&"; 116 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 117 static u_int32_t net_mask __P((struct in_addr)); 118 #endif 119 120 #if !defined(isascii) /* XXX - could be a function */ 121 # define isascii(c) (!(c & 0200)) 122 #endif 123 124 /* 125 * Resolver state default settings. 126 */ 127 128 /* 129 * Set up default settings. If the configuration file exist, the values 130 * there will have precedence. Otherwise, the server address is set to 131 * INADDR_ANY and the default domain name comes from the gethostname(). 132 * 133 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 134 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 135 * since it was noted that INADDR_ANY actually meant ``the first interface 136 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 137 * it had to be "up" in order for you to reach your own name server. It 138 * was later decided that since the recommended practice is to always 139 * install local static routes through 127.0.0.1 for all your network 140 * interfaces, that we could solve this problem without a code change. 141 * 142 * The configuration file should always be used, since it is the only way 143 * to specify a default domain. If you are running a server on your local 144 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 145 * in the configuration file. 146 * 147 * Return 0 if completes successfully, -1 on error 148 */ 149 int 150 res_ninit(res_state statp) { 151 extern int __res_vinit(res_state, int); 152 153 return (__res_vinit(statp, 0)); 154 } 155 156 /* This function has to be reachable by res_data.c but not publically. */ 157 int 158 __res_vinit(res_state statp, int preinit) { 159 register FILE *fp; 160 register char *cp, **pp; 161 register int n; 162 char buf[BUFSIZ]; 163 int nserv = 0; /* number of nameserver records read from file */ 164 int haveenv = 0; 165 int havesearch = 0; 166 #ifdef RESOLVSORT 167 int nsort = 0; 168 char *net; 169 #endif 170 int dots; 171 union res_sockaddr_union u[2]; 172 173 if (!preinit) { 174 statp->retrans = RES_TIMEOUT; 175 statp->retry = RES_DFLRETRY; 176 statp->options = RES_DEFAULT; 177 statp->id = res_randomid(); 178 } 179 180 if ((statp->options & RES_INIT) != 0U) 181 res_ndestroy(statp); 182 183 memset(u, 0, sizeof(u)); 184 #ifdef USELOOPBACK 185 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 186 #else 187 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 188 #endif 189 u[nserv].sin.sin_family = AF_INET; 190 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 191 #ifdef HAVE_SA_LEN 192 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 193 #endif 194 nserv++; 195 #ifdef HAS_INET6_STRUCTS 196 #ifdef USELOOPBACK 197 u[nserv].sin6.sin6_addr = in6addr_loopback; 198 #else 199 u[nserv].sin6.sin6_addr = in6addr_any; 200 #endif 201 u[nserv].sin6.sin6_family = AF_INET6; 202 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 203 #ifdef HAVE_SA_LEN 204 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 205 #endif 206 nserv++; 207 #endif 208 statp->nscount = 0; 209 statp->ndots = 1; 210 statp->pfcode = 0; 211 statp->_vcsock = -1; 212 statp->_flags = 0; 213 statp->qhook = NULL; 214 statp->rhook = NULL; 215 statp->_u._ext.nscount = 0; 216 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 217 if (statp->_u._ext.ext != NULL) { 218 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 219 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 220 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 221 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 222 } 223 #ifdef RESOLVSORT 224 statp->nsort = 0; 225 #endif 226 res_setservers(statp, u, nserv); 227 228 /* Allow user to override the local domain definition */ 229 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 230 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 231 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 232 haveenv++; 233 234 /* 235 * Set search list to be blank-separated strings 236 * from rest of env value. Permits users of LOCALDOMAIN 237 * to still have a search list, and anyone to set the 238 * one that they want to use as an individual (even more 239 * important now that the rfc1535 stuff restricts searches) 240 */ 241 cp = statp->defdname; 242 pp = statp->dnsrch; 243 *pp++ = cp; 244 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 245 if (*cp == '\n') /* silly backwards compat */ 246 break; 247 else if (*cp == ' ' || *cp == '\t') { 248 *cp = 0; 249 n = 1; 250 } else if (n) { 251 *pp++ = cp; 252 n = 0; 253 havesearch = 1; 254 } 255 } 256 /* null terminate last domain if there are excess */ 257 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 258 cp++; 259 *cp = '\0'; 260 *pp++ = 0; 261 } 262 263 #define MATCH(line, name) \ 264 (!strncmp(line, name, sizeof(name) - 1) && \ 265 (line[sizeof(name) - 1] == ' ' || \ 266 line[sizeof(name) - 1] == '\t')) 267 268 nserv = 0; 269 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 270 /* read the config file */ 271 while (fgets(buf, sizeof(buf), fp) != NULL) { 272 /* skip comments */ 273 if (*buf == ';' || *buf == '#') 274 continue; 275 /* read default domain name */ 276 if (MATCH(buf, "domain")) { 277 if (haveenv) /* skip if have from environ */ 278 continue; 279 cp = buf + sizeof("domain") - 1; 280 while (*cp == ' ' || *cp == '\t') 281 cp++; 282 if ((*cp == '\0') || (*cp == '\n')) 283 continue; 284 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 285 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 286 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 287 *cp = '\0'; 288 havesearch = 0; 289 continue; 290 } 291 /* set search list */ 292 if (MATCH(buf, "search")) { 293 if (haveenv) /* skip if have from environ */ 294 continue; 295 cp = buf + sizeof("search") - 1; 296 while (*cp == ' ' || *cp == '\t') 297 cp++; 298 if ((*cp == '\0') || (*cp == '\n')) 299 continue; 300 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 301 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 302 if ((cp = strchr(statp->defdname, '\n')) != NULL) 303 *cp = '\0'; 304 /* 305 * Set search list to be blank-separated strings 306 * on rest of line. 307 */ 308 cp = statp->defdname; 309 pp = statp->dnsrch; 310 *pp++ = cp; 311 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 312 if (*cp == ' ' || *cp == '\t') { 313 *cp = 0; 314 n = 1; 315 } else if (n) { 316 *pp++ = cp; 317 n = 0; 318 } 319 } 320 /* null terminate last domain if there are excess */ 321 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 322 cp++; 323 *cp = '\0'; 324 *pp++ = 0; 325 havesearch = 1; 326 continue; 327 } 328 /* read nameservers to query */ 329 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 330 struct addrinfo hints, *ai; 331 char sbuf[NI_MAXSERV]; 332 const size_t minsiz = 333 sizeof(statp->_u._ext.ext->nsaddrs[0]); 334 335 cp = buf + sizeof("nameserver") - 1; 336 while (*cp == ' ' || *cp == '\t') 337 cp++; 338 cp[strcspn(cp, ";# \t\n")] = '\0'; 339 if ((*cp != '\0') && (*cp != '\n')) { 340 memset(&hints, 0, sizeof(hints)); 341 hints.ai_family = PF_UNSPEC; 342 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 343 hints.ai_flags = AI_NUMERICHOST; 344 sprintf(sbuf, "%u", NAMESERVER_PORT); 345 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 346 ai->ai_addrlen <= minsiz) { 347 if (statp->_u._ext.ext != NULL) { 348 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 349 ai->ai_addr, ai->ai_addrlen); 350 } 351 if (ai->ai_addrlen <= 352 sizeof(statp->nsaddr_list[nserv])) { 353 memcpy(&statp->nsaddr_list[nserv], 354 ai->ai_addr, ai->ai_addrlen); 355 } else 356 statp->nsaddr_list[nserv].sin_family = 0; 357 freeaddrinfo(ai); 358 nserv++; 359 } 360 } 361 continue; 362 } 363 #ifdef RESOLVSORT 364 if (MATCH(buf, "sortlist")) { 365 struct in_addr a; 366 367 cp = buf + sizeof("sortlist") - 1; 368 while (nsort < MAXRESOLVSORT) { 369 while (*cp == ' ' || *cp == '\t') 370 cp++; 371 if (*cp == '\0' || *cp == '\n' || *cp == ';') 372 break; 373 net = cp; 374 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 375 isascii(*cp) && !isspace((unsigned char)*cp)) 376 cp++; 377 n = *cp; 378 *cp = 0; 379 if (inet_aton(net, &a)) { 380 statp->sort_list[nsort].addr = a; 381 if (ISSORTMASK(n)) { 382 *cp++ = n; 383 net = cp; 384 while (*cp && *cp != ';' && 385 isascii(*cp) && 386 !isspace((unsigned char)*cp)) 387 cp++; 388 n = *cp; 389 *cp = 0; 390 if (inet_aton(net, &a)) { 391 statp->sort_list[nsort].mask = a.s_addr; 392 } else { 393 statp->sort_list[nsort].mask = 394 net_mask(statp->sort_list[nsort].addr); 395 } 396 } else { 397 statp->sort_list[nsort].mask = 398 net_mask(statp->sort_list[nsort].addr); 399 } 400 nsort++; 401 } 402 *cp = n; 403 } 404 continue; 405 } 406 #endif 407 if (MATCH(buf, "options")) { 408 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 409 continue; 410 } 411 } 412 if (nserv > 0) 413 statp->nscount = nserv; 414 #ifdef RESOLVSORT 415 statp->nsort = nsort; 416 #endif 417 (void) fclose(fp); 418 } 419 /* 420 * Last chance to get a nameserver. This should not normally 421 * be necessary 422 */ 423 #ifdef NO_RESOLV_CONF 424 if(nserv == 0) 425 nserv = get_nameservers(statp); 426 #endif 427 428 if (statp->defdname[0] == 0 && 429 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 430 (cp = strchr(buf, '.')) != NULL) 431 strcpy(statp->defdname, cp + 1); 432 433 /* find components of local domain that might be searched */ 434 if (havesearch == 0) { 435 pp = statp->dnsrch; 436 *pp++ = statp->defdname; 437 *pp = NULL; 438 439 dots = 0; 440 for (cp = statp->defdname; *cp; cp++) 441 dots += (*cp == '.'); 442 443 cp = statp->defdname; 444 while (pp < statp->dnsrch + MAXDFLSRCH) { 445 if (dots < LOCALDOMAINPARTS) 446 break; 447 cp = strchr(cp, '.') + 1; /* we know there is one */ 448 *pp++ = cp; 449 dots--; 450 } 451 *pp = NULL; 452 #ifdef DEBUG 453 if (statp->options & RES_DEBUG) { 454 printf(";; res_init()... default dnsrch list:\n"); 455 for (pp = statp->dnsrch; *pp; pp++) 456 printf(";;\t%s\n", *pp); 457 printf(";;\t..END..\n"); 458 } 459 #endif 460 } 461 462 if ((cp = getenv("RES_OPTIONS")) != NULL) 463 res_setoptions(statp, cp, "env"); 464 statp->options |= RES_INIT; 465 return (0); 466 } 467 468 static void 469 res_setoptions(res_state statp, const char *options, const char *source) 470 { 471 const char *cp = options; 472 int i; 473 struct __res_state_ext *ext = statp->_u._ext.ext; 474 475 #ifdef DEBUG 476 if (statp->options & RES_DEBUG) 477 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 478 options, source); 479 #endif 480 while (*cp) { 481 /* skip leading and inner runs of spaces */ 482 while (*cp == ' ' || *cp == '\t') 483 cp++; 484 /* search for and process individual options */ 485 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 486 i = atoi(cp + sizeof("ndots:") - 1); 487 if (i <= RES_MAXNDOTS) 488 statp->ndots = i; 489 else 490 statp->ndots = RES_MAXNDOTS; 491 #ifdef DEBUG 492 if (statp->options & RES_DEBUG) 493 printf(";;\tndots=%d\n", statp->ndots); 494 #endif 495 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 496 i = atoi(cp + sizeof("timeout:") - 1); 497 if (i <= RES_MAXRETRANS) 498 statp->retrans = i; 499 else 500 statp->retrans = RES_MAXRETRANS; 501 #ifdef DEBUG 502 if (statp->options & RES_DEBUG) 503 printf(";;\ttimeout=%d\n", statp->retrans); 504 #endif 505 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 506 i = atoi(cp + sizeof("attempts:") - 1); 507 if (i <= RES_MAXRETRY) 508 statp->retry = i; 509 else 510 statp->retry = RES_MAXRETRY; 511 #ifdef DEBUG 512 if (statp->options & RES_DEBUG) 513 printf(";;\tattempts=%d\n", statp->retry); 514 #endif 515 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 516 #ifdef DEBUG 517 if (!(statp->options & RES_DEBUG)) { 518 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 519 options, source); 520 statp->options |= RES_DEBUG; 521 } 522 printf(";;\tdebug\n"); 523 #endif 524 } else if (!strncmp(cp, "no_tld_query", 525 sizeof("no_tld_query") - 1) || 526 !strncmp(cp, "no-tld-query", 527 sizeof("no-tld-query") - 1)) { 528 statp->options |= RES_NOTLDQUERY; 529 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 530 statp->options |= RES_USE_INET6; 531 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 532 statp->options |= RES_ROTATE; 533 } else if (!strncmp(cp, "no-check-names", 534 sizeof("no-check-names") - 1)) { 535 statp->options |= RES_NOCHECKNAME; 536 } 537 #ifdef RES_USE_EDNS0 538 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 539 statp->options |= RES_USE_EDNS0; 540 } 541 #endif 542 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 543 statp->options |= RES_USE_DNAME; 544 } 545 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 546 if (ext == NULL) 547 goto skip; 548 cp += sizeof("nibble:") - 1; 549 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 550 strncpy(ext->nsuffix, cp, (size_t)i); 551 ext->nsuffix[i] = '\0'; 552 } 553 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 554 if (ext == NULL) 555 goto skip; 556 cp += sizeof("nibble2:") - 1; 557 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 558 strncpy(ext->nsuffix2, cp, (size_t)i); 559 ext->nsuffix2[i] = '\0'; 560 } 561 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 562 cp += sizeof("v6revmode:") - 1; 563 /* "nibble" and "bitstring" used to be valid */ 564 if (!strncmp(cp, "single", sizeof("single") - 1)) { 565 statp->options |= RES_NO_NIBBLE2; 566 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 567 statp->options &= 568 ~RES_NO_NIBBLE2; 569 } 570 } 571 else { 572 /* XXX - print a warning here? */ 573 } 574 skip: 575 /* skip to next run of spaces */ 576 while (*cp && *cp != ' ' && *cp != '\t') 577 cp++; 578 } 579 } 580 581 #ifdef RESOLVSORT 582 /* XXX - should really support CIDR which means explicit masks always. */ 583 static u_int32_t 584 net_mask(in) /* XXX - should really use system's version of this */ 585 struct in_addr in; 586 { 587 register u_int32_t i = ntohl(in.s_addr); 588 589 if (IN_CLASSA(i)) 590 return (htonl(IN_CLASSA_NET)); 591 else if (IN_CLASSB(i)) 592 return (htonl(IN_CLASSB_NET)); 593 return (htonl(IN_CLASSC_NET)); 594 } 595 #endif 596 597 u_int 598 res_randomid(void) { 599 struct timeval now; 600 601 gettimeofday(&now, NULL); 602 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 603 } 604 605 /* 606 * This routine is for closing the socket if a virtual circuit is used and 607 * the program wants to close it. This provides support for endhostent() 608 * which expects to close the socket. 609 * 610 * This routine is not expected to be user visible. 611 */ 612 void 613 res_nclose(res_state statp) { 614 int ns; 615 616 if (statp->_vcsock >= 0) { 617 (void) close(statp->_vcsock); 618 statp->_vcsock = -1; 619 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 620 } 621 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 622 if (statp->_u._ext.nssocks[ns] != -1) { 623 (void) close(statp->_u._ext.nssocks[ns]); 624 statp->_u._ext.nssocks[ns] = -1; 625 } 626 } 627 } 628 629 void 630 res_ndestroy(res_state statp) { 631 res_nclose(statp); 632 if (statp->_u._ext.ext != NULL) 633 free(statp->_u._ext.ext); 634 statp->options &= ~RES_INIT; 635 statp->_u._ext.ext = NULL; 636 } 637 638 const char * 639 res_get_nibblesuffix(res_state statp) { 640 if (statp->_u._ext.ext) 641 return (statp->_u._ext.ext->nsuffix); 642 return ("ip6.arpa"); 643 } 644 645 const char * 646 res_get_nibblesuffix2(res_state statp) { 647 if (statp->_u._ext.ext) 648 return (statp->_u._ext.ext->nsuffix2); 649 return ("ip6.int"); 650 } 651 652 void 653 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 654 int i, nserv; 655 size_t size; 656 657 /* close open servers */ 658 res_nclose(statp); 659 660 /* cause rtt times to be forgotten */ 661 statp->_u._ext.nscount = 0; 662 663 nserv = 0; 664 for (i = 0; i < cnt && nserv < MAXNS; i++) { 665 switch (set->sin.sin_family) { 666 case AF_INET: 667 size = sizeof(set->sin); 668 if (statp->_u._ext.ext) 669 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 670 &set->sin, size); 671 if (size <= sizeof(statp->nsaddr_list[nserv])) 672 memcpy(&statp->nsaddr_list[nserv], 673 &set->sin, size); 674 else 675 statp->nsaddr_list[nserv].sin_family = 0; 676 nserv++; 677 break; 678 679 #ifdef HAS_INET6_STRUCTS 680 case AF_INET6: 681 size = sizeof(set->sin6); 682 if (statp->_u._ext.ext) 683 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 684 &set->sin6, size); 685 if (size <= sizeof(statp->nsaddr_list[nserv])) 686 memcpy(&statp->nsaddr_list[nserv], 687 &set->sin6, size); 688 else 689 statp->nsaddr_list[nserv].sin_family = 0; 690 nserv++; 691 break; 692 #endif 693 694 default: 695 break; 696 } 697 set++; 698 } 699 statp->nscount = nserv; 700 701 } 702 703 int 704 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 705 int i; 706 size_t size; 707 u_int16_t family; 708 709 for (i = 0; i < statp->nscount && i < cnt; i++) { 710 if (statp->_u._ext.ext) 711 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 712 else 713 family = statp->nsaddr_list[i].sin_family; 714 715 switch (family) { 716 case AF_INET: 717 size = sizeof(set->sin); 718 if (statp->_u._ext.ext) 719 memcpy(&set->sin, 720 &statp->_u._ext.ext->nsaddrs[i], 721 size); 722 else 723 memcpy(&set->sin, &statp->nsaddr_list[i], 724 size); 725 break; 726 727 #ifdef HAS_INET6_STRUCTS 728 case AF_INET6: 729 size = sizeof(set->sin6); 730 if (statp->_u._ext.ext) 731 memcpy(&set->sin6, 732 &statp->_u._ext.ext->nsaddrs[i], 733 size); 734 else 735 memcpy(&set->sin6, &statp->nsaddr_list[i], 736 size); 737 break; 738 #endif 739 740 default: 741 set->sin.sin_family = 0; 742 break; 743 } 744 set++; 745 } 746 return (statp->nscount); 747 } 748
Indexes created Mon Sep 22 10:09:38 GMT 2025