res_init.c revision 1.15
1 /* $NetBSD: res_init.c,v 1.15 2008/06/21 23:37:53 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 1.23 2007/07/09 01:43:23 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_init.c,v 1.15 2008/06/21 23:37:53 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 85 #include "namespace.h" 86 #include <sys/types.h> 87 #include <sys/param.h> 88 #include <sys/socket.h> 89 #include <sys/time.h> 90 91 #include <netinet/in.h> 92 #include <arpa/inet.h> 93 #include <arpa/nameser.h> 94 95 #include <ctype.h> 96 #include <stdio.h> 97 #include <stdlib.h> 98 #include <string.h> 99 #include <unistd.h> 100 #include <netdb.h> 101 102 #include "port_after.h" 103 104 #if 0 105 #ifdef __weak_alias 106 __weak_alias(res_ninit,_res_ninit) 107 __weak_alias(res_randomid,__res_randomid) 108 __weak_alias(res_nclose,_res_nclose) 109 __weak_alias(res_ndestroy,_res_ndestroy) 110 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix) 111 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2) 112 __weak_alias(res_getservers,__res_getservers) 113 __weak_alias(res_setservers,__res_setservers) 114 #endif 115 #endif 116 117 118 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 119 #include <resolv.h> 120 121 #include "res_private.h" 122 123 #define RESOLVSORT 124 /*% Options. Should all be left alone. */ 125 #ifndef DEBUG 126 #define DEBUG 127 #endif 128 129 #ifdef SOLARIS2 130 #include <sys/systeminfo.h> 131 #endif 132 133 static void res_setoptions __P((res_state, const char *, const char *)); 134 135 #ifdef RESOLVSORT 136 static const char sort_mask[] = "/&"; 137 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 138 static u_int32_t net_mask __P((struct in_addr)); 139 #endif 140 141 #if !defined(isascii) /*%< XXX - could be a function */ 142 # define isascii(c) (!(c & 0200)) 143 #endif 144 145 /* 146 * Resolver state default settings. 147 */ 148 149 /*% 150 * Set up default settings. If the configuration file exist, the values 151 * there will have precedence. Otherwise, the server address is set to 152 * INADDR_ANY and the default domain name comes from the gethostname(). 153 * 154 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 155 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 156 * since it was noted that INADDR_ANY actually meant ``the first interface 157 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 158 * it had to be "up" in order for you to reach your own name server. It 159 * was later decided that since the recommended practice is to always 160 * install local static routes through 127.0.0.1 for all your network 161 * interfaces, that we could solve this problem without a code change. 162 * 163 * The configuration file should always be used, since it is the only way 164 * to specify a default domain. If you are running a server on your local 165 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 166 * in the configuration file. 167 * 168 * Return 0 if completes successfully, -1 on error 169 */ 170 int 171 res_ninit(res_state statp) { 172 extern int __res_vinit(res_state, int); 173 174 return (__res_vinit(statp, 0)); 175 } 176 177 /*% This function has to be reachable by res_data.c but not publically. */ 178 int 179 __res_vinit(res_state statp, int preinit) { 180 register FILE *fp; 181 register char *cp, **pp; 182 register int n; 183 char buf[BUFSIZ]; 184 int nserv = 0; /*%< number of nameserver records read from file */ 185 int haveenv = 0; 186 int havesearch = 0; 187 #ifdef RESOLVSORT 188 int nsort = 0; 189 char *net; 190 #endif 191 int dots; 192 union res_sockaddr_union u[2]; 193 194 int maxns = MAXNS; 195 196 RES_SET_H_ERRNO(statp, 0); 197 198 if (!preinit) { 199 statp->retrans = RES_TIMEOUT; 200 statp->retry = RES_DFLRETRY; 201 statp->options = RES_DEFAULT; 202 statp->id = res_randomid(); 203 } 204 205 if ((statp->options & RES_INIT) != 0U) 206 res_ndestroy(statp); 207 208 memset(u, 0, sizeof(u)); 209 #ifdef USELOOPBACK 210 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 211 #else 212 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 213 #endif 214 u[nserv].sin.sin_family = AF_INET; 215 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 216 #ifdef HAVE_SA_LEN 217 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 218 #endif 219 nserv++; 220 #ifdef HAS_INET6_STRUCTS 221 #ifdef USELOOPBACK 222 u[nserv].sin6.sin6_addr = in6addr_loopback; 223 #else 224 u[nserv].sin6.sin6_addr = in6addr_any; 225 #endif 226 u[nserv].sin6.sin6_family = AF_INET6; 227 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 228 #ifdef HAVE_SA_LEN 229 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 230 #endif 231 nserv++; 232 #endif 233 statp->nscount = 0; 234 statp->ndots = 1; 235 statp->pfcode = 0; 236 statp->_vcsock = -1; 237 statp->_flags = 0; 238 statp->qhook = NULL; 239 statp->rhook = NULL; 240 statp->_u._ext.nscount = 0; 241 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 242 if (statp->_u._ext.ext != NULL) { 243 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 244 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 245 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 246 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 247 } else { 248 /* 249 * Historically res_init() rarely, if at all, failed. 250 * Examples and applications exist which do not check 251 * our return code. Furthermore several applications 252 * simply call us to get the systems domainname. So 253 * rather then immediately fail here we store the 254 * failure, which is returned later, in h_errno. And 255 * prevent the collection of 'nameserver' information 256 * by setting maxns to 0. Thus applications that fail 257 * to check our return code wont be able to make 258 * queries anyhow. 259 */ 260 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 261 maxns = 0; 262 } 263 #ifdef RESOLVSORT 264 statp->nsort = 0; 265 #endif 266 res_setservers(statp, u, nserv); 267 268 #ifdef SOLARIS2 269 /* 270 * The old libresolv derived the defaultdomain from NIS/NIS+. 271 * We want to keep this behaviour 272 */ 273 { 274 char buf[sizeof(statp->defdname)], *cp; 275 int ret; 276 277 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 278 (unsigned int)ret <= sizeof(buf)) { 279 if (buf[0] == '+') 280 buf[0] = '.'; 281 cp = strchr(buf, '.'); 282 cp = (cp == NULL) ? buf : (cp + 1); 283 (void)strlcpy(statp->defdname, cp, 284 sizeof(statp->defdname)); 285 } 286 } 287 #endif /* SOLARIS2 */ 288 289 /* Allow user to override the local domain definition */ 290 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 291 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 292 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 293 haveenv++; 294 295 /* 296 * Set search list to be blank-separated strings 297 * from rest of env value. Permits users of LOCALDOMAIN 298 * to still have a search list, and anyone to set the 299 * one that they want to use as an individual (even more 300 * important now that the rfc1535 stuff restricts searches) 301 */ 302 cp = statp->defdname; 303 pp = statp->dnsrch; 304 *pp++ = cp; 305 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 306 if (*cp == '\n') /*%< silly backwards compat */ 307 break; 308 else if (*cp == ' ' || *cp == '\t') { 309 *cp = 0; 310 n = 1; 311 } else if (n) { 312 *pp++ = cp; 313 n = 0; 314 havesearch = 1; 315 } 316 } 317 /* null terminate last domain if there are excess */ 318 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 319 cp++; 320 *cp = '\0'; 321 *pp++ = 0; 322 } 323 324 #define MATCH(line, name) \ 325 (!strncmp(line, name, sizeof(name) - 1) && \ 326 (line[sizeof(name) - 1] == ' ' || \ 327 line[sizeof(name) - 1] == '\t')) 328 329 nserv = 0; 330 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 331 /* read the config file */ 332 while (fgets(buf, sizeof(buf), fp) != NULL) { 333 /* skip comments */ 334 if (*buf == ';' || *buf == '#') 335 continue; 336 /* read default domain name */ 337 if (MATCH(buf, "domain")) { 338 if (haveenv) /*%< skip if have from environ */ 339 continue; 340 cp = buf + sizeof("domain") - 1; 341 while (*cp == ' ' || *cp == '\t') 342 cp++; 343 if ((*cp == '\0') || (*cp == '\n')) 344 continue; 345 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 346 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 347 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 348 *cp = '\0'; 349 havesearch = 0; 350 continue; 351 } 352 /* set search list */ 353 if (MATCH(buf, "search")) { 354 if (haveenv) /*%< skip if have from environ */ 355 continue; 356 cp = buf + sizeof("search") - 1; 357 while (*cp == ' ' || *cp == '\t') 358 cp++; 359 if ((*cp == '\0') || (*cp == '\n')) 360 continue; 361 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 362 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 363 if ((cp = strchr(statp->defdname, '\n')) != NULL) 364 *cp = '\0'; 365 /* 366 * Set search list to be blank-separated strings 367 * on rest of line. 368 */ 369 cp = statp->defdname; 370 pp = statp->dnsrch; 371 *pp++ = cp; 372 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 373 if (*cp == ' ' || *cp == '\t') { 374 *cp = 0; 375 n = 1; 376 } else if (n) { 377 *pp++ = cp; 378 n = 0; 379 } 380 } 381 /* null terminate last domain if there are excess */ 382 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 383 cp++; 384 *cp = '\0'; 385 *pp++ = 0; 386 havesearch = 1; 387 continue; 388 } 389 /* read nameservers to query */ 390 if (MATCH(buf, "nameserver") && nserv < maxns) { 391 struct addrinfo hints, *ai; 392 char sbuf[NI_MAXSERV]; 393 const size_t minsiz = 394 sizeof(statp->_u._ext.ext->nsaddrs[0]); 395 396 cp = buf + sizeof("nameserver") - 1; 397 while (*cp == ' ' || *cp == '\t') 398 cp++; 399 cp[strcspn(cp, ";# \t\n")] = '\0'; 400 if ((*cp != '\0') && (*cp != '\n')) { 401 memset(&hints, 0, sizeof(hints)); 402 hints.ai_family = PF_UNSPEC; 403 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 404 hints.ai_flags = AI_NUMERICHOST; 405 sprintf(sbuf, "%u", NAMESERVER_PORT); 406 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 407 ai->ai_addrlen <= minsiz) { 408 if (statp->_u._ext.ext != NULL) { 409 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 410 ai->ai_addr, ai->ai_addrlen); 411 } 412 if (ai->ai_addrlen <= 413 sizeof(statp->nsaddr_list[nserv])) { 414 memcpy(&statp->nsaddr_list[nserv], 415 ai->ai_addr, ai->ai_addrlen); 416 } else 417 statp->nsaddr_list[nserv].sin_family = 0; 418 freeaddrinfo(ai); 419 nserv++; 420 } 421 } 422 continue; 423 } 424 #ifdef RESOLVSORT 425 if (MATCH(buf, "sortlist")) { 426 struct in_addr a; 427 428 cp = buf + sizeof("sortlist") - 1; 429 while (nsort < MAXRESOLVSORT) { 430 while (*cp == ' ' || *cp == '\t') 431 cp++; 432 if (*cp == '\0' || *cp == '\n' || *cp == ';') 433 break; 434 net = cp; 435 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 436 isascii(*cp) && !isspace((unsigned char)*cp)) 437 cp++; 438 n = *cp; 439 *cp = 0; 440 if (inet_aton(net, &a)) { 441 statp->sort_list[nsort].addr = a; 442 if (ISSORTMASK(n)) { 443 *cp++ = n; 444 net = cp; 445 while (*cp && *cp != ';' && 446 isascii(*cp) && 447 !isspace((unsigned char)*cp)) 448 cp++; 449 n = *cp; 450 *cp = 0; 451 if (inet_aton(net, &a)) { 452 statp->sort_list[nsort].mask = a.s_addr; 453 } else { 454 statp->sort_list[nsort].mask = 455 net_mask(statp->sort_list[nsort].addr); 456 } 457 } else { 458 statp->sort_list[nsort].mask = 459 net_mask(statp->sort_list[nsort].addr); 460 } 461 nsort++; 462 } 463 *cp = n; 464 } 465 continue; 466 } 467 #endif 468 if (MATCH(buf, "options")) { 469 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 470 continue; 471 } 472 } 473 if (nserv > 0) 474 statp->nscount = nserv; 475 #ifdef RESOLVSORT 476 statp->nsort = nsort; 477 #endif 478 (void) fclose(fp); 479 } 480 /* 481 * Last chance to get a nameserver. This should not normally 482 * be necessary 483 */ 484 #ifdef NO_RESOLV_CONF 485 if(nserv == 0) 486 nserv = get_nameservers(statp); 487 #endif 488 489 if (statp->defdname[0] == 0 && 490 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 491 (cp = strchr(buf, '.')) != NULL) 492 strcpy(statp->defdname, cp + 1); 493 494 /* find components of local domain that might be searched */ 495 if (havesearch == 0) { 496 pp = statp->dnsrch; 497 *pp++ = statp->defdname; 498 *pp = NULL; 499 500 dots = 0; 501 for (cp = statp->defdname; *cp; cp++) 502 dots += (*cp == '.'); 503 504 cp = statp->defdname; 505 while (pp < statp->dnsrch + MAXDFLSRCH) { 506 if (dots < LOCALDOMAINPARTS) 507 break; 508 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 509 *pp++ = cp; 510 dots--; 511 } 512 *pp = NULL; 513 #ifdef DEBUG 514 if (statp->options & RES_DEBUG) { 515 printf(";; res_init()... default dnsrch list:\n"); 516 for (pp = statp->dnsrch; *pp; pp++) 517 printf(";;\t%s\n", *pp); 518 printf(";;\t..END..\n"); 519 } 520 #endif 521 } 522 523 if ((cp = getenv("RES_OPTIONS")) != NULL) 524 res_setoptions(statp, cp, "env"); 525 statp->options |= RES_INIT; 526 527 return (statp->res_h_errno); 528 } 529 530 static void 531 res_setoptions(res_state statp, const char *options, const char *source) 532 { 533 const char *cp = options; 534 int i; 535 struct __res_state_ext *ext = statp->_u._ext.ext; 536 537 #ifdef DEBUG 538 if (statp->options & RES_DEBUG) 539 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 540 options, source); 541 #endif 542 while (*cp) { 543 /* skip leading and inner runs of spaces */ 544 while (*cp == ' ' || *cp == '\t') 545 cp++; 546 /* search for and process individual options */ 547 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 548 i = atoi(cp + sizeof("ndots:") - 1); 549 if (i <= RES_MAXNDOTS) 550 statp->ndots = i; 551 else 552 statp->ndots = RES_MAXNDOTS; 553 #ifdef DEBUG 554 if (statp->options & RES_DEBUG) 555 printf(";;\tndots=%d\n", statp->ndots); 556 #endif 557 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 558 i = atoi(cp + sizeof("timeout:") - 1); 559 if (i <= RES_MAXRETRANS) 560 statp->retrans = i; 561 else 562 statp->retrans = RES_MAXRETRANS; 563 #ifdef DEBUG 564 if (statp->options & RES_DEBUG) 565 printf(";;\ttimeout=%d\n", statp->retrans); 566 #endif 567 #ifdef SOLARIS2 568 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 569 /* 570 * For backward compatibility, 'retrans' is 571 * supported as an alias for 'timeout', though 572 * without an imposed maximum. 573 */ 574 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 575 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 576 /* 577 * For backward compatibility, 'retry' is 578 * supported as an alias for 'attempts', though 579 * without an imposed maximum. 580 */ 581 statp->retry = atoi(cp + sizeof("retry:") - 1); 582 #endif /* SOLARIS2 */ 583 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 584 i = atoi(cp + sizeof("attempts:") - 1); 585 if (i <= RES_MAXRETRY) 586 statp->retry = i; 587 else 588 statp->retry = RES_MAXRETRY; 589 #ifdef DEBUG 590 if (statp->options & RES_DEBUG) 591 printf(";;\tattempts=%d\n", statp->retry); 592 #endif 593 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 594 #ifdef DEBUG 595 if (!(statp->options & RES_DEBUG)) { 596 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 597 options, source); 598 statp->options |= RES_DEBUG; 599 } 600 printf(";;\tdebug\n"); 601 #endif 602 } else if (!strncmp(cp, "no_tld_query", 603 sizeof("no_tld_query") - 1) || 604 !strncmp(cp, "no-tld-query", 605 sizeof("no-tld-query") - 1)) { 606 statp->options |= RES_NOTLDQUERY; 607 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 608 statp->options |= RES_USE_INET6; 609 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 610 statp->options |= RES_ROTATE; 611 } else if (!strncmp(cp, "no-check-names", 612 sizeof("no-check-names") - 1)) { 613 statp->options |= RES_NOCHECKNAME; 614 } 615 #ifdef RES_USE_EDNS0 616 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 617 statp->options |= RES_USE_EDNS0; 618 } 619 #endif 620 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 621 statp->options |= RES_USE_DNAME; 622 } 623 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 624 if (ext == NULL) 625 goto skip; 626 cp += sizeof("nibble:") - 1; 627 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 628 strncpy(ext->nsuffix, cp, (size_t)i); 629 ext->nsuffix[i] = '\0'; 630 } 631 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 632 if (ext == NULL) 633 goto skip; 634 cp += sizeof("nibble2:") - 1; 635 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 636 strncpy(ext->nsuffix2, cp, (size_t)i); 637 ext->nsuffix2[i] = '\0'; 638 } 639 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 640 cp += sizeof("v6revmode:") - 1; 641 /* "nibble" and "bitstring" used to be valid */ 642 if (!strncmp(cp, "single", sizeof("single") - 1)) { 643 statp->options |= RES_NO_NIBBLE2; 644 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 645 statp->options &= 646 ~RES_NO_NIBBLE2; 647 } 648 } 649 else { 650 /* XXX - print a warning here? */ 651 } 652 skip: 653 /* skip to next run of spaces */ 654 while (*cp && *cp != ' ' && *cp != '\t') 655 cp++; 656 } 657 } 658 659 #ifdef RESOLVSORT 660 /* XXX - should really support CIDR which means explicit masks always. */ 661 static u_int32_t 662 net_mask(in) /*!< XXX - should really use system's version of this */ 663 struct in_addr in; 664 { 665 register u_int32_t i = ntohl(in.s_addr); 666 667 if (IN_CLASSA(i)) 668 return (htonl(IN_CLASSA_NET)); 669 else if (IN_CLASSB(i)) 670 return (htonl(IN_CLASSB_NET)); 671 return (htonl(IN_CLASSC_NET)); 672 } 673 #endif 674 675 u_int 676 res_randomid(void) { 677 struct timeval now; 678 679 gettimeofday(&now, NULL); 680 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 681 } 682 683 /*% 684 * This routine is for closing the socket if a virtual circuit is used and 685 * the program wants to close it. This provides support for endhostent() 686 * which expects to close the socket. 687 * 688 * This routine is not expected to be user visible. 689 */ 690 void 691 res_nclose(res_state statp) { 692 int ns; 693 694 if (statp->_vcsock >= 0) { 695 (void) close(statp->_vcsock); 696 statp->_vcsock = -1; 697 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 698 } 699 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 700 if (statp->_u._ext.nssocks[ns] != -1) { 701 (void) close(statp->_u._ext.nssocks[ns]); 702 statp->_u._ext.nssocks[ns] = -1; 703 } 704 } 705 } 706 707 void 708 res_ndestroy(res_state statp) { 709 res_nclose(statp); 710 if (statp->_u._ext.ext != NULL) 711 free(statp->_u._ext.ext); 712 statp->options &= ~RES_INIT; 713 statp->_u._ext.ext = NULL; 714 } 715 716 const char * 717 res_get_nibblesuffix(res_state statp) { 718 if (statp->_u._ext.ext) 719 return (statp->_u._ext.ext->nsuffix); 720 return ("ip6.arpa"); 721 } 722 723 const char * 724 res_get_nibblesuffix2(res_state statp) { 725 if (statp->_u._ext.ext) 726 return (statp->_u._ext.ext->nsuffix2); 727 return ("ip6.int"); 728 } 729 730 void 731 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 732 int i, nserv; 733 size_t size; 734 735 /* close open servers */ 736 res_nclose(statp); 737 738 /* cause rtt times to be forgotten */ 739 statp->_u._ext.nscount = 0; 740 741 nserv = 0; 742 for (i = 0; i < cnt && nserv < MAXNS; i++) { 743 switch (set->sin.sin_family) { 744 case AF_INET: 745 size = sizeof(set->sin); 746 if (statp->_u._ext.ext) 747 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 748 &set->sin, size); 749 if (size <= sizeof(statp->nsaddr_list[nserv])) 750 memcpy(&statp->nsaddr_list[nserv], 751 &set->sin, size); 752 else 753 statp->nsaddr_list[nserv].sin_family = 0; 754 nserv++; 755 break; 756 757 #ifdef HAS_INET6_STRUCTS 758 case AF_INET6: 759 size = sizeof(set->sin6); 760 if (statp->_u._ext.ext) 761 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 762 &set->sin6, size); 763 if (size <= sizeof(statp->nsaddr_list[nserv])) 764 memcpy(&statp->nsaddr_list[nserv], 765 &set->sin6, size); 766 else 767 statp->nsaddr_list[nserv].sin_family = 0; 768 nserv++; 769 break; 770 #endif 771 772 default: 773 break; 774 } 775 set++; 776 } 777 statp->nscount = nserv; 778 779 } 780 781 int 782 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 783 int i; 784 size_t size; 785 u_int16_t family; 786 787 for (i = 0; i < statp->nscount && i < cnt; i++) { 788 if (statp->_u._ext.ext) 789 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 790 else 791 family = statp->nsaddr_list[i].sin_family; 792 793 switch (family) { 794 case AF_INET: 795 size = sizeof(set->sin); 796 if (statp->_u._ext.ext) 797 memcpy(&set->sin, 798 &statp->_u._ext.ext->nsaddrs[i], 799 size); 800 else 801 memcpy(&set->sin, &statp->nsaddr_list[i], 802 size); 803 break; 804 805 #ifdef HAS_INET6_STRUCTS 806 case AF_INET6: 807 size = sizeof(set->sin6); 808 if (statp->_u._ext.ext) 809 memcpy(&set->sin6, 810 &statp->_u._ext.ext->nsaddrs[i], 811 size); 812 else 813 memcpy(&set->sin6, &statp->nsaddr_list[i], 814 size); 815 break; 816 #endif 817 818 default: 819 set->sin.sin_family = 0; 820 break; 821 } 822 set++; 823 } 824 return (statp->nscount); 825 } 826 827 /*! \file */ 828
Indexes created Sat Sep 20 22:09:52 GMT 2025