res_init.c revision 1.8.4.3
1 /* $NetBSD: res_init.c,v 1.8.4.3 2011/01/23 21:47:51 bouyer 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 1.16.18.7 2007/07/09 01:52:58 mar 78 ka Exp"; 79 #else 80 __RCSID("$NetBSD: res_init.c,v 1.8.4.3 2011/01/23 21:47:51 bouyer Exp $"); 81 #endif 82 #endif /* LIBC_SCCS and not lint */ 83 84 #include "port_before.h" 85 86 #include "namespace.h" 87 #include <sys/types.h> 88 #include <sys/param.h> 89 #include <sys/socket.h> 90 #include <sys/time.h> 91 92 #include <netinet/in.h> 93 #include <arpa/inet.h> 94 #include <arpa/nameser.h> 95 96 #include <ctype.h> 97 #include <stdio.h> 98 #include <stdlib.h> 99 #include <string.h> 100 #include <unistd.h> 101 #include <netdb.h> 102 103 #include "port_after.h" 104 105 #if 0 106 #ifdef __weak_alias 107 __weak_alias(res_ninit,_res_ninit) 108 __weak_alias(res_randomid,__res_randomid) 109 __weak_alias(res_nclose,_res_nclose) 110 __weak_alias(res_ndestroy,_res_ndestroy) 111 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix) 112 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2) 113 __weak_alias(res_getservers,__res_getservers) 114 __weak_alias(res_setservers,__res_setservers) 115 #endif 116 #endif 117 118 119 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 120 #include <resolv.h> 121 122 #include "res_private.h" 123 124 /*% Options. Should all be left alone. */ 125 #ifndef DEBUG 126 #define RESOLVSORT 127 #define DEBUG 128 #endif 129 130 #ifdef SOLARIS2 131 #include <sys/systeminfo.h> 132 #endif 133 134 static void res_setoptions __P((res_state, const char *, const char *)); 135 136 #ifdef RESOLVSORT 137 static const char sort_mask[] = "/&"; 138 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 139 static u_int32_t net_mask __P((struct in_addr)); 140 #endif 141 142 #if !defined(isascii) /*%< XXX - could be a function */ 143 # define isascii(c) (!(c & 0200)) 144 #endif 145 146 /* 147 * Resolver state default settings. 148 */ 149 150 /*% 151 * Set up default settings. If the configuration file exist, the values 152 * there will have precedence. Otherwise, the server address is set to 153 * INADDR_ANY and the default domain name comes from the gethostname(). 154 * 155 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 156 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 157 * since it was noted that INADDR_ANY actually meant ``the first interface 158 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 159 * it had to be "up" in order for you to reach your own name server. It 160 * was later decided that since the recommended practice is to always 161 * install local static routes through 127.0.0.1 for all your network 162 * interfaces, that we could solve this problem without a code change. 163 * 164 * The configuration file should always be used, since it is the only way 165 * to specify a default domain. If you are running a server on your local 166 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 167 * in the configuration file. 168 * 169 * Return 0 if completes successfully, -1 on error 170 */ 171 int 172 res_ninit(res_state statp) { 173 extern int __res_vinit(res_state, int); 174 175 return (__res_vinit(statp, 0)); 176 } 177 178 /*% This function has to be reachable by res_data.c but not publically. */ 179 int 180 __res_vinit(res_state statp, int preinit) { 181 register FILE *fp; 182 register char *cp, **pp; 183 register int n; 184 char buf[BUFSIZ]; 185 int nserv = 0; /*%< number of nameserver records read from file */ 186 int haveenv = 0; 187 int havesearch = 0; 188 #ifdef RESOLVSORT 189 int nsort = 0; 190 char *net; 191 #endif 192 int dots; 193 union res_sockaddr_union u[2]; 194 int maxns = MAXNS; 195 196 RES_SET_H_ERRNO(statp, 0); 197 if (statp->_u._ext.ext != NULL) 198 res_ndestroy(statp); 199 200 if (!preinit) { 201 statp->retrans = RES_TIMEOUT; 202 statp->retry = RES_DFLRETRY; 203 statp->options = RES_DEFAULT; 204 statp->id = res_randomid(); 205 } 206 207 if ((statp->options & RES_INIT) != 0U) 208 res_ndestroy(statp); 209 210 memset(u, 0, sizeof(u)); 211 #ifdef USELOOPBACK 212 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 213 #else 214 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 215 #endif 216 u[nserv].sin.sin_family = AF_INET; 217 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 218 #ifdef HAVE_SA_LEN 219 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 220 #endif 221 nserv++; 222 #ifdef HAS_INET6_STRUCTS 223 #ifdef USELOOPBACK 224 u[nserv].sin6.sin6_addr = in6addr_loopback; 225 #else 226 u[nserv].sin6.sin6_addr = in6addr_any; 227 #endif 228 u[nserv].sin6.sin6_family = AF_INET6; 229 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 230 #ifdef HAVE_SA_LEN 231 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 232 #endif 233 nserv++; 234 #endif 235 statp->nscount = 0; 236 statp->ndots = 1; 237 statp->pfcode = 0; 238 statp->_vcsock = -1; 239 statp->_flags = 0; 240 statp->qhook = NULL; 241 statp->rhook = NULL; 242 statp->_u._ext.nscount = 0; 243 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 244 if (statp->_u._ext.ext != NULL) { 245 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 246 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 247 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 248 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 249 } else { 250 /* 251 * Historically res_init() rarely, if at all, failed. 252 * Examples and applications exist which do not check 253 * our return code. Furthermore several applications 254 * simply call us to get the systems domainname. So 255 * rather then immediately fail here we store the 256 * failure, which is returned later, in h_errno. And 257 * prevent the collection of 'nameserver' information 258 * by setting maxns to 0. Thus applications that fail 259 * to check our return code wont be able to make 260 * queries anyhow. 261 */ 262 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 263 maxns = 0; 264 } 265 #ifdef RESOLVSORT 266 statp->nsort = 0; 267 #endif 268 res_setservers(statp, u, nserv); 269 270 #ifdef SOLARIS2 271 /* 272 * The old libresolv derived the defaultdomain from NIS/NIS+. 273 * We want to keep this behaviour 274 */ 275 { 276 char buf[sizeof(statp->defdname)], *cp; 277 int ret; 278 279 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 280 (unsigned int)ret <= sizeof(buf)) { 281 if (buf[0] == '+') 282 buf[0] = '.'; 283 cp = strchr(buf, '.'); 284 cp = (cp == NULL) ? buf : (cp + 1); 285 strncpy(statp->defdname, cp, 286 sizeof(statp->defdname) - 1); 287 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 288 } 289 } 290 #endif /* SOLARIS2 */ 291 292 /* Allow user to override the local domain definition */ 293 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 294 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 295 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 296 haveenv++; 297 298 /* 299 * Set search list to be blank-separated strings 300 * from rest of env value. Permits users of LOCALDOMAIN 301 * to still have a search list, and anyone to set the 302 * one that they want to use as an individual (even more 303 * important now that the rfc1535 stuff restricts searches) 304 */ 305 cp = statp->defdname; 306 pp = statp->dnsrch; 307 *pp++ = cp; 308 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 309 if (*cp == '\n') /*%< silly backwards compat */ 310 break; 311 else if (*cp == ' ' || *cp == '\t') { 312 *cp = 0; 313 n = 1; 314 } else if (n) { 315 *pp++ = cp; 316 n = 0; 317 havesearch = 1; 318 } 319 } 320 /* null terminate last domain if there are excess */ 321 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 322 cp++; 323 *cp = '\0'; 324 *pp++ = 0; 325 } 326 327 #define MATCH(line, name) \ 328 (!strncmp(line, name, sizeof(name) - 1) && \ 329 (line[sizeof(name) - 1] == ' ' || \ 330 line[sizeof(name) - 1] == '\t')) 331 332 nserv = 0; 333 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 334 /* read the config file */ 335 while (fgets(buf, sizeof(buf), fp) != NULL) { 336 /* skip comments */ 337 if (*buf == ';' || *buf == '#') 338 continue; 339 /* read default domain name */ 340 if (MATCH(buf, "domain")) { 341 if (haveenv) /*%< skip if have from environ */ 342 continue; 343 cp = buf + sizeof("domain") - 1; 344 while (*cp == ' ' || *cp == '\t') 345 cp++; 346 if ((*cp == '\0') || (*cp == '\n')) 347 continue; 348 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 349 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 350 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 351 *cp = '\0'; 352 havesearch = 0; 353 continue; 354 } 355 /* set search list */ 356 if (MATCH(buf, "search")) { 357 if (haveenv) /*%< skip if have from environ */ 358 continue; 359 cp = buf + sizeof("search") - 1; 360 while (*cp == ' ' || *cp == '\t') 361 cp++; 362 if ((*cp == '\0') || (*cp == '\n')) 363 continue; 364 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 365 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 366 if ((cp = strchr(statp->defdname, '\n')) != NULL) 367 *cp = '\0'; 368 /* 369 * Set search list to be blank-separated strings 370 * on rest of line. 371 */ 372 cp = statp->defdname; 373 pp = statp->dnsrch; 374 *pp++ = cp; 375 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 376 if (*cp == ' ' || *cp == '\t') { 377 *cp = 0; 378 n = 1; 379 } else if (n) { 380 *pp++ = cp; 381 n = 0; 382 } 383 } 384 /* null terminate last domain if there are excess */ 385 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 386 cp++; 387 *cp = '\0'; 388 *pp++ = 0; 389 havesearch = 1; 390 continue; 391 } 392 /* read nameservers to query */ 393 if (MATCH(buf, "nameserver") && nserv < maxns) { 394 struct addrinfo hints, *ai; 395 char sbuf[NI_MAXSERV]; 396 const size_t minsiz = 397 sizeof(statp->_u._ext.ext->nsaddrs[0]); 398 399 cp = buf + sizeof("nameserver") - 1; 400 while (*cp == ' ' || *cp == '\t') 401 cp++; 402 cp[strcspn(cp, ";# \t\n")] = '\0'; 403 if ((*cp != '\0') && (*cp != '\n')) { 404 memset(&hints, 0, sizeof(hints)); 405 hints.ai_family = PF_UNSPEC; 406 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 407 hints.ai_flags = AI_NUMERICHOST; 408 sprintf(sbuf, "%u", NAMESERVER_PORT); 409 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 410 ai->ai_addrlen <= minsiz) { 411 if (statp->_u._ext.ext != NULL) { 412 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 413 ai->ai_addr, ai->ai_addrlen); 414 } 415 if (ai->ai_addrlen <= 416 sizeof(statp->nsaddr_list[nserv])) { 417 memcpy(&statp->nsaddr_list[nserv], 418 ai->ai_addr, ai->ai_addrlen); 419 } else 420 statp->nsaddr_list[nserv].sin_family = 0; 421 freeaddrinfo(ai); 422 nserv++; 423 } 424 } 425 continue; 426 } 427 #ifdef RESOLVSORT 428 if (MATCH(buf, "sortlist")) { 429 struct in_addr a; 430 431 cp = buf + sizeof("sortlist") - 1; 432 while (nsort < MAXRESOLVSORT) { 433 while (*cp == ' ' || *cp == '\t') 434 cp++; 435 if (*cp == '\0' || *cp == '\n' || *cp == ';') 436 break; 437 net = cp; 438 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 439 isascii(*cp) && !isspace((unsigned char)*cp)) 440 cp++; 441 n = *cp; 442 *cp = 0; 443 if (inet_aton(net, &a)) { 444 statp->sort_list[nsort].addr = a; 445 if (ISSORTMASK(n)) { 446 *cp++ = n; 447 net = cp; 448 while (*cp && *cp != ';' && 449 isascii(*cp) && 450 !isspace((unsigned char)*cp)) 451 cp++; 452 n = *cp; 453 *cp = 0; 454 if (inet_aton(net, &a)) { 455 statp->sort_list[nsort].mask = a.s_addr; 456 } else { 457 statp->sort_list[nsort].mask = 458 net_mask(statp->sort_list[nsort].addr); 459 } 460 } else { 461 statp->sort_list[nsort].mask = 462 net_mask(statp->sort_list[nsort].addr); 463 } 464 nsort++; 465 } 466 *cp = n; 467 } 468 continue; 469 } 470 #endif 471 if (MATCH(buf, "options")) { 472 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 473 continue; 474 } 475 } 476 if (nserv > 0) 477 statp->nscount = nserv; 478 #ifdef RESOLVSORT 479 statp->nsort = nsort; 480 #endif 481 (void) fclose(fp); 482 } 483 /* 484 * Last chance to get a nameserver. This should not normally 485 * be necessary 486 */ 487 #ifdef NO_RESOLV_CONF 488 if(nserv == 0) 489 nserv = get_nameservers(statp); 490 #endif 491 492 if (statp->defdname[0] == 0 && 493 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 494 (cp = strchr(buf, '.')) != NULL) 495 strcpy(statp->defdname, cp + 1); 496 497 /* find components of local domain that might be searched */ 498 if (havesearch == 0) { 499 pp = statp->dnsrch; 500 *pp++ = statp->defdname; 501 *pp = NULL; 502 503 dots = 0; 504 for (cp = statp->defdname; *cp; cp++) 505 dots += (*cp == '.'); 506 507 cp = statp->defdname; 508 while (pp < statp->dnsrch + MAXDFLSRCH) { 509 if (dots < LOCALDOMAINPARTS) 510 break; 511 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 512 *pp++ = cp; 513 dots--; 514 } 515 *pp = NULL; 516 #ifdef DEBUG 517 if (statp->options & RES_DEBUG) { 518 printf(";; res_init()... default dnsrch list:\n"); 519 for (pp = statp->dnsrch; *pp; pp++) 520 printf(";;\t%s\n", *pp); 521 printf(";;\t..END..\n"); 522 } 523 #endif 524 } 525 526 if ((cp = getenv("RES_OPTIONS")) != NULL) 527 res_setoptions(statp, cp, "env"); 528 statp->options |= RES_INIT; 529 return (statp->res_h_errno); 530 } 531 532 static void 533 res_setoptions(res_state statp, const char *options, const char *source) 534 { 535 const char *cp = options; 536 int i; 537 struct __res_state_ext *ext = statp->_u._ext.ext; 538 539 #ifdef DEBUG 540 if (statp->options & RES_DEBUG) 541 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 542 options, source); 543 #endif 544 while (*cp) { 545 /* skip leading and inner runs of spaces */ 546 while (*cp == ' ' || *cp == '\t') 547 cp++; 548 /* search for and process individual options */ 549 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 550 i = atoi(cp + sizeof("ndots:") - 1); 551 if (i <= RES_MAXNDOTS) 552 statp->ndots = i; 553 else 554 statp->ndots = RES_MAXNDOTS; 555 #ifdef DEBUG 556 if (statp->options & RES_DEBUG) 557 printf(";;\tndots=%d\n", statp->ndots); 558 #endif 559 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 560 i = atoi(cp + sizeof("timeout:") - 1); 561 if (i <= RES_MAXRETRANS) 562 statp->retrans = i; 563 else 564 statp->retrans = RES_MAXRETRANS; 565 #ifdef DEBUG 566 if (statp->options & RES_DEBUG) 567 printf(";;\ttimeout=%d\n", statp->retrans); 568 #endif 569 #ifdef SOLARIS2 570 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 571 /* 572 * For backward compatibility, 'retrans' is 573 * supported as an alias for 'timeout', though 574 * without an imposed maximum. 575 */ 576 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 577 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 578 /* 579 * For backward compatibility, 'retry' is 580 * supported as an alias for 'attempts', though 581 * without an imposed maximum. 582 */ 583 statp->retry = atoi(cp + sizeof("retry:") - 1); 584 #endif /* SOLARIS2 */ 585 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 586 i = atoi(cp + sizeof("attempts:") - 1); 587 if (i <= RES_MAXRETRY) 588 statp->retry = i; 589 else 590 statp->retry = RES_MAXRETRY; 591 #ifdef DEBUG 592 if (statp->options & RES_DEBUG) 593 printf(";;\tattempts=%d\n", statp->retry); 594 #endif 595 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 596 #ifdef DEBUG 597 if (!(statp->options & RES_DEBUG)) { 598 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 599 options, source); 600 statp->options |= RES_DEBUG; 601 } 602 printf(";;\tdebug\n"); 603 #endif 604 } else if (!strncmp(cp, "no_tld_query", 605 sizeof("no_tld_query") - 1) || 606 !strncmp(cp, "no-tld-query", 607 sizeof("no-tld-query") - 1)) { 608 statp->options |= RES_NOTLDQUERY; 609 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 610 statp->options |= RES_USE_INET6; 611 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 612 statp->options |= RES_ROTATE; 613 } else if (!strncmp(cp, "no-check-names", 614 sizeof("no-check-names") - 1)) { 615 statp->options |= RES_NOCHECKNAME; 616 } 617 #ifdef RES_USE_EDNS0 618 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 619 statp->options |= RES_USE_EDNS0; 620 } 621 #endif 622 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 623 statp->options |= RES_USE_DNAME; 624 } 625 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 626 if (ext == NULL) 627 goto skip; 628 cp += sizeof("nibble:") - 1; 629 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 630 strncpy(ext->nsuffix, cp, (size_t)i); 631 ext->nsuffix[i] = '\0'; 632 } 633 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 634 if (ext == NULL) 635 goto skip; 636 cp += sizeof("nibble2:") - 1; 637 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 638 strncpy(ext->nsuffix2, cp, (size_t)i); 639 ext->nsuffix2[i] = '\0'; 640 } 641 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 642 cp += sizeof("v6revmode:") - 1; 643 /* "nibble" and "bitstring" used to be valid */ 644 if (!strncmp(cp, "single", sizeof("single") - 1)) { 645 statp->options |= RES_NO_NIBBLE2; 646 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 647 statp->options &= 648 ~RES_NO_NIBBLE2; 649 } 650 } 651 else { 652 /* XXX - print a warning here? */ 653 } 654 skip: 655 /* skip to next run of spaces */ 656 while (*cp && *cp != ' ' && *cp != '\t') 657 cp++; 658 } 659 } 660 661 #ifdef RESOLVSORT 662 /* XXX - should really support CIDR which means explicit masks always. */ 663 static u_int32_t 664 net_mask(in) /*!< XXX - should really use system's version of this */ 665 struct in_addr in; 666 { 667 register u_int32_t i = ntohl(in.s_addr); 668 669 if (IN_CLASSA(i)) 670 return (htonl(IN_CLASSA_NET)); 671 else if (IN_CLASSB(i)) 672 return (htonl(IN_CLASSB_NET)); 673 return (htonl(IN_CLASSC_NET)); 674 } 675 #endif 676 677 u_int 678 res_randomid(void) { 679 struct timeval now; 680 681 gettimeofday(&now, NULL); 682 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 683 } 684 685 /*% 686 * This routine is for closing the socket if a virtual circuit is used and 687 * the program wants to close it. This provides support for endhostent() 688 * which expects to close the socket. 689 * 690 * This routine is not expected to be user visible. 691 */ 692 void 693 res_nclose(res_state statp) { 694 int ns; 695 696 if (statp->_vcsock >= 0) { 697 (void) close(statp->_vcsock); 698 statp->_vcsock = -1; 699 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 700 } 701 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 702 if (statp->_u._ext.nssocks[ns] != -1) { 703 (void) close(statp->_u._ext.nssocks[ns]); 704 statp->_u._ext.nssocks[ns] = -1; 705 } 706 } 707 } 708 709 void 710 res_ndestroy(res_state statp) { 711 res_nclose(statp); 712 if (statp->_u._ext.ext != NULL) 713 free(statp->_u._ext.ext); 714 statp->options &= ~RES_INIT; 715 statp->_u._ext.ext = NULL; 716 } 717 718 const char * 719 res_get_nibblesuffix(res_state statp) { 720 if (statp->_u._ext.ext) 721 return (statp->_u._ext.ext->nsuffix); 722 return ("ip6.arpa"); 723 } 724 725 const char * 726 res_get_nibblesuffix2(res_state statp) { 727 if (statp->_u._ext.ext) 728 return (statp->_u._ext.ext->nsuffix2); 729 return ("ip6.int"); 730 } 731 732 void 733 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 734 int i, nserv; 735 size_t size; 736 737 /* close open servers */ 738 res_nclose(statp); 739 740 /* cause rtt times to be forgotten */ 741 statp->_u._ext.nscount = 0; 742 743 nserv = 0; 744 for (i = 0; i < cnt && nserv < MAXNS; i++) { 745 switch (set->sin.sin_family) { 746 case AF_INET: 747 size = sizeof(set->sin); 748 if (statp->_u._ext.ext) 749 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 750 &set->sin, size); 751 if (size <= sizeof(statp->nsaddr_list[nserv])) 752 memcpy(&statp->nsaddr_list[nserv], 753 &set->sin, size); 754 #ifdef notdef 755 else 756 statp->nsaddr_list[nserv].sin_family = 0; 757 #endif 758 nserv++; 759 break; 760 761 #ifdef HAS_INET6_STRUCTS 762 case AF_INET6: 763 size = sizeof(set->sin6); 764 if (statp->_u._ext.ext) 765 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 766 &set->sin6, size); 767 if (size <= sizeof(statp->nsaddr_list[nserv])) 768 memcpy(&statp->nsaddr_list[nserv], 769 &set->sin6, size); 770 else 771 statp->nsaddr_list[nserv].sin_family = 0; 772 nserv++; 773 break; 774 #endif 775 776 default: 777 break; 778 } 779 set++; 780 } 781 statp->nscount = nserv; 782 783 } 784 785 int 786 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 787 int i; 788 size_t size; 789 u_int16_t family; 790 791 for (i = 0; i < statp->nscount && i < cnt; i++) { 792 if (statp->_u._ext.ext) 793 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 794 else 795 family = statp->nsaddr_list[i].sin_family; 796 797 switch (family) { 798 case AF_INET: 799 size = sizeof(set->sin); 800 if (statp->_u._ext.ext) 801 memcpy(&set->sin, 802 &statp->_u._ext.ext->nsaddrs[i], 803 size); 804 else 805 memcpy(&set->sin, &statp->nsaddr_list[i], 806 size); 807 break; 808 809 #ifdef HAS_INET6_STRUCTS 810 case AF_INET6: 811 size = sizeof(set->sin6); 812 if (statp->_u._ext.ext) 813 memcpy(&set->sin6, 814 &statp->_u._ext.ext->nsaddrs[i], 815 size); 816 else 817 memcpy(&set->sin6, &statp->nsaddr_list[i], 818 size); 819 break; 820 #endif 821 822 default: 823 set->sin.sin_family = 0; 824 break; 825 } 826 set++; 827 } 828 return (statp->nscount); 829 } 830 831 /*! \file */ 832
Indexes created Wed Sep 24 22:09:59 GMT 2025