1/* 2 * Copyright (c) 1985, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30/* 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 */ 49 50/* 51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 53 * 54 * Permission to use, copy, modify, and distribute this software for any 55 * purpose with or without fee is hereby granted, provided that the above 56 * copyright notice and this permission notice appear in all copies. 57 * 58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 65 */ 66 67#if defined(LIBC_SCCS) && !defined(lint) 68static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 69static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $"; 70#endif /* LIBC_SCCS and not lint */ 71#include <sys/cdefs.h> 72__FBSDID("$FreeBSD: stable/10/lib/libc/resolv/res_init.c 309485 2016-12-03 17:17:42Z ngie $"); 73 74#include "port_before.h" 75 76#include "namespace.h" 77 78#include <sys/types.h> 79#include <sys/param.h> 80#include <sys/socket.h> 81#include <sys/stat.h> 82#include <sys/time.h> 83 84#include <netinet/in.h> 85#include <arpa/inet.h> 86#include <arpa/nameser.h> 87 88#include <ctype.h> 89#include <stdio.h> 90#include <stdlib.h> 91#include <string.h> 92#include <unistd.h> 93#include <netdb.h> 94 95#ifndef HAVE_MD5 96# include "../dst/md5.h" 97#else 98# ifdef SOLARIS2 99# include <sys/md5.h> 100# elif _LIBC 101# include <md5.h> 102# endif 103#endif 104#ifndef _MD5_H_ 105# define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 106#endif 107 108#include "un-namespace.h" 109 110#include "port_after.h" 111 112/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 113#include <resolv.h> 114 115#include "res_private.h" 116 117/*% Options. Should all be left alone. */ 118#define RESOLVSORT 119#ifndef DEBUG 120#define DEBUG 121#endif 122 123#ifdef SOLARIS2 124#include <sys/systeminfo.h> 125#endif 126 127static void res_setoptions(res_state, const char *, const char *); 128 129#ifdef RESOLVSORT 130static const char sort_mask[] = "/&"; 131#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 132static u_int32_t net_mask(struct in_addr); 133#endif 134 135#if !defined(isascii) /*%< XXX - could be a function */ 136# define isascii(c) (!(c & 0200)) 137#endif 138 139/* 140 * Resolver state default settings. 141 */ 142 143/*% 144 * Set up default settings. If the configuration file exist, the values 145 * there will have precedence. Otherwise, the server address is set to 146 * INADDR_ANY and the default domain name comes from the gethostname(). 147 * 148 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 149 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 150 * since it was noted that INADDR_ANY actually meant ``the first interface 151 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 152 * it had to be "up" in order for you to reach your own name server. It 153 * was later decided that since the recommended practice is to always 154 * install local static routes through 127.0.0.1 for all your network 155 * interfaces, that we could solve this problem without a code change. 156 * 157 * The configuration file should always be used, since it is the only way 158 * to specify a default domain. If you are running a server on your local 159 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 160 * in the configuration file. 161 * 162 * Return 0 if completes successfully, -1 on error 163 */ 164int 165res_ninit(res_state statp) { 166 extern int __res_vinit(res_state, int); 167 168 return (__res_vinit(statp, 0)); 169} 170 171/*% This function has to be reachable by res_data.c but not publically. */ 172int 173__res_vinit(res_state statp, int preinit) { 174 FILE *fp; 175 char *cp, **pp; 176 int n; 177 char buf[BUFSIZ]; 178 int nserv = 0; /*%< number of nameserver records read from file */ 179 int haveenv = 0; 180 int havesearch = 0; 181#ifdef RESOLVSORT 182 int nsort = 0; 183 char *net; 184#endif 185 int dots; 186 union res_sockaddr_union u[2]; 187 int maxns = MAXNS; 188 189 RES_SET_H_ERRNO(statp, 0); 190 if (statp->_u._ext.ext != NULL) 191 res_ndestroy(statp); 192 193 if (!preinit) { 194 statp->retrans = RES_TIMEOUT; 195 statp->retry = RES_DFLRETRY; 196 statp->options = RES_DEFAULT; 197 } 198 199 statp->_rnd = malloc(16); 200 res_rndinit(statp); 201 statp->id = res_nrandomid(statp); 202 203 memset(u, 0, sizeof(u)); 204#ifdef USELOOPBACK 205 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 206#else 207 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 208#endif 209 u[nserv].sin.sin_family = AF_INET; 210 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 211#ifdef HAVE_SA_LEN 212 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 213#endif 214 nserv++; 215#ifdef HAS_INET6_STRUCTS 216#ifdef USELOOPBACK 217 u[nserv].sin6.sin6_addr = in6addr_loopback; 218#else 219 u[nserv].sin6.sin6_addr = in6addr_any; 220#endif 221 u[nserv].sin6.sin6_family = AF_INET6; 222 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 223#ifdef HAVE_SA_LEN 224 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 225#endif 226 nserv++; 227#endif 228 statp->nscount = 0; 229 statp->ndots = 1; 230 statp->pfcode = 0; 231 statp->_vcsock = -1; 232 statp->_flags = 0; 233 statp->qhook = NULL; 234 statp->rhook = NULL; 235 statp->_u._ext.nscount = 0; 236 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 237 if (statp->_u._ext.ext != NULL) { 238 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 239 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 240 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 241 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 242 statp->_u._ext.ext->reload_period = 2; 243 } else { 244 /* 245 * Historically res_init() rarely, if at all, failed. 246 * Examples and applications exist which do not check 247 * our return code. Furthermore several applications 248 * simply call us to get the systems domainname. So 249 * rather then immediately fail here we store the 250 * failure, which is returned later, in h_errno. And 251 * prevent the collection of 'nameserver' information 252 * by setting maxns to 0. Thus applications that fail 253 * to check our return code wont be able to make 254 * queries anyhow. 255 */ 256 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 257 maxns = 0; 258 } 259#ifdef RESOLVSORT 260 statp->nsort = 0; 261#endif 262 res_setservers(statp, u, nserv); 263 264#ifdef SOLARIS2 265 /* 266 * The old libresolv derived the defaultdomain from NIS/NIS+. 267 * We want to keep this behaviour 268 */ 269 { 270 char buf[sizeof(statp->defdname)], *cp; 271 int ret; 272 273 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 274 (unsigned int)ret <= sizeof(buf)) { 275 if (buf[0] == '+') 276 buf[0] = '.'; 277 cp = strchr(buf, '.'); 278 cp = (cp == NULL) ? buf : (cp + 1); 279 strncpy(statp->defdname, cp, 280 sizeof(statp->defdname) - 1); 281 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 282 } 283 } 284#endif /* SOLARIS2 */ 285 286 /* Allow user to override the local domain definition */ 287 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 288 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 289 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 290 haveenv++; 291 292 /* 293 * Set search list to be blank-separated strings 294 * from rest of env value. Permits users of LOCALDOMAIN 295 * to still have a search list, and anyone to set the 296 * one that they want to use as an individual (even more 297 * important now that the rfc1535 stuff restricts searches) 298 */ 299 cp = statp->defdname; 300 pp = statp->dnsrch; 301 *pp++ = cp; 302 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 303 if (*cp == '\n') /*%< silly backwards compat */ 304 break; 305 else if (*cp == ' ' || *cp == '\t') { 306 *cp = 0; 307 n = 1; 308 } else if (n) { 309 *pp++ = cp; 310 n = 0; 311 havesearch = 1; 312 } 313 } 314 /* null terminate last domain if there are excess */ 315 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 316 cp++; 317 *cp = '\0'; 318 *pp++ = NULL; 319 } 320 321#define MATCH(line, name) \ 322 (!strncmp(line, name, sizeof(name) - 1) && \ 323 (line[sizeof(name) - 1] == ' ' || \ 324 line[sizeof(name) - 1] == '\t')) 325 326 nserv = 0; 327 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 328 struct stat sb; 329 struct timespec now; 330 331 if (statp->_u._ext.ext != NULL) { 332 if (_fstat(fileno(fp), &sb) == 0) { 333 statp->_u._ext.ext->conf_mtim = sb.st_mtim; 334 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 335 statp->_u._ext.ext->conf_stat = now.tv_sec; 336 } 337 } 338 } 339 340 /* read the config file */ 341 while (fgets(buf, sizeof(buf), fp) != NULL) { 342 /* skip comments */ 343 if (*buf == ';' || *buf == '#') 344 continue; 345 /* read default domain name */ 346 if (MATCH(buf, "domain")) { 347 if (haveenv) /*%< skip if have from environ */ 348 continue; 349 cp = buf + sizeof("domain") - 1; 350 while (*cp == ' ' || *cp == '\t') 351 cp++; 352 if ((*cp == '\0') || (*cp == '\n')) 353 continue; 354 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 355 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 356 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 357 *cp = '\0'; 358 havesearch = 0; 359 continue; 360 } 361 /* set search list */ 362 if (MATCH(buf, "search")) { 363 if (haveenv) /*%< skip if have from environ */ 364 continue; 365 cp = buf + sizeof("search") - 1; 366 while (*cp == ' ' || *cp == '\t') 367 cp++; 368 if ((*cp == '\0') || (*cp == '\n')) 369 continue; 370 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 371 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 372 if ((cp = strchr(statp->defdname, '\n')) != NULL) 373 *cp = '\0'; 374 /* 375 * Set search list to be blank-separated strings 376 * on rest of line. 377 */ 378 cp = statp->defdname; 379 pp = statp->dnsrch; 380 *pp++ = cp; 381 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 382 if (*cp == ' ' || *cp == '\t') { 383 *cp = 0; 384 n = 1; 385 } else if (n) { 386 *pp++ = cp; 387 n = 0; 388 } 389 } 390 /* null terminate last domain if there are excess */ 391 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 392 cp++; 393 *cp = '\0'; 394 *pp++ = NULL; 395 havesearch = 1; 396 continue; 397 } 398 /* read nameservers to query */ 399 if (MATCH(buf, "nameserver") && nserv < maxns) { 400 struct addrinfo hints, *ai; 401 char sbuf[NI_MAXSERV]; 402 const size_t minsiz = 403 sizeof(statp->_u._ext.ext->nsaddrs[0]); 404 405 cp = buf + sizeof("nameserver") - 1; 406 while (*cp == ' ' || *cp == '\t') 407 cp++; 408 cp[strcspn(cp, ";# \t\n")] = '\0'; 409 if ((*cp != '\0') && (*cp != '\n')) { 410 memset(&hints, 0, sizeof(hints)); 411 hints.ai_family = PF_UNSPEC; 412 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 413 hints.ai_flags = AI_NUMERICHOST; 414 sprintf(sbuf, "%u", NAMESERVER_PORT); 415 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0) { 416 if (ai->ai_addrlen <= minsiz) { 417 if (statp->_u._ext.ext != NULL) { 418 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 419 ai->ai_addr, ai->ai_addrlen); 420 } 421 if (ai->ai_addrlen <= 422 sizeof(statp->nsaddr_list[nserv])) { 423 memcpy(&statp->nsaddr_list[nserv], 424 ai->ai_addr, ai->ai_addrlen); 425 } else 426 statp->nsaddr_list[nserv].sin_family = 0; 427 nserv++; 428 } 429 freeaddrinfo(ai); 430 } 431 } 432 continue; 433 } 434#ifdef RESOLVSORT 435 if (MATCH(buf, "sortlist")) { 436 struct in_addr a; 437 struct in6_addr a6; 438 int m, i; 439 u_char *u; 440 struct __res_state_ext *ext = statp->_u._ext.ext; 441 442 cp = buf + sizeof("sortlist") - 1; 443 while (nsort < MAXRESOLVSORT) { 444 while (*cp == ' ' || *cp == '\t') 445 cp++; 446 if (*cp == '\0' || *cp == '\n' || *cp == ';') 447 break; 448 net = cp; 449 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 450 isascii(*cp) && !isspace((unsigned char)*cp)) 451 cp++; 452 n = *cp; 453 *cp = 0; 454 if (inet_aton(net, &a)) { 455 statp->sort_list[nsort].addr = a; 456 if (ISSORTMASK(n)) { 457 *cp++ = n; 458 net = cp; 459 while (*cp && *cp != ';' && 460 isascii(*cp) && 461 !isspace((unsigned char)*cp)) 462 cp++; 463 n = *cp; 464 *cp = 0; 465 if (inet_aton(net, &a)) { 466 statp->sort_list[nsort].mask = a.s_addr; 467 } else { 468 statp->sort_list[nsort].mask = 469 net_mask(statp->sort_list[nsort].addr); 470 } 471 } else { 472 statp->sort_list[nsort].mask = 473 net_mask(statp->sort_list[nsort].addr); 474 } 475 ext->sort_list[nsort].af = AF_INET; 476 ext->sort_list[nsort].addr.ina = 477 statp->sort_list[nsort].addr; 478 ext->sort_list[nsort].mask.ina.s_addr = 479 statp->sort_list[nsort].mask; 480 nsort++; 481 } 482 else if (inet_pton(AF_INET6, net, &a6) == 1) { 483 484 ext->sort_list[nsort].af = AF_INET6; 485 ext->sort_list[nsort].addr.in6a = a6; 486 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 487 *cp++ = n; 488 net = cp; 489 while (*cp && *cp != ';' && 490 isascii(*cp) && !isspace(*cp)) 491 cp++; 492 m = n; 493 n = *cp; 494 *cp = 0; 495 switch (m) { 496 case '/': 497 m = atoi(net); 498 break; 499 case '&': 500 if (inet_pton(AF_INET6, net, u) == 1) { 501 m = -1; 502 break; 503 } 504 /*FALLTHROUGH*/ 505 default: 506 m = sizeof(struct in6_addr) * CHAR_BIT; 507 break; 508 } 509 if (m >= 0) { 510 for (i = 0; i < sizeof(struct in6_addr); i++) { 511 if (m <= 0) { 512 *u = 0; 513 } else { 514 m -= CHAR_BIT; 515 *u = (u_char)~0; 516 if (m < 0) 517 *u <<= -m; 518 } 519 u++; 520 } 521 } 522 statp->sort_list[nsort].addr.s_addr = 523 (u_int32_t)0xffffffff; 524 statp->sort_list[nsort].mask = 525 (u_int32_t)0xffffffff; 526 nsort++; 527 } 528 *cp = n; 529 } 530 continue; 531 } 532#endif 533 if (MATCH(buf, "options")) { 534 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 535 continue; 536 } 537 } 538 if (nserv > 0) 539 statp->nscount = nserv; 540#ifdef RESOLVSORT 541 statp->nsort = nsort; 542#endif 543 (void) fclose(fp); 544 } 545/* 546 * Last chance to get a nameserver. This should not normally 547 * be necessary 548 */ 549#ifdef NO_RESOLV_CONF 550 if(nserv == 0) 551 nserv = get_nameservers(statp); 552#endif 553 554 if (statp->defdname[0] == 0 && 555 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 556 (cp = strchr(buf, '.')) != NULL) 557 strcpy(statp->defdname, cp + 1); 558 559 /* find components of local domain that might be searched */ 560 if (havesearch == 0) { 561 pp = statp->dnsrch; 562 *pp++ = statp->defdname; 563 *pp = NULL; 564 565 dots = 0; 566 for (cp = statp->defdname; *cp; cp++) 567 dots += (*cp == '.'); 568 569 cp = statp->defdname; 570 while (pp < statp->dnsrch + MAXDFLSRCH) { 571 if (dots < LOCALDOMAINPARTS) 572 break; 573 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 574 *pp++ = cp; 575 dots--; 576 } 577 *pp = NULL; 578#ifdef DEBUG 579 if (statp->options & RES_DEBUG) { 580 printf(";; res_init()... default dnsrch list:\n"); 581 for (pp = statp->dnsrch; *pp; pp++) 582 printf(";;\t%s\n", *pp); 583 printf(";;\t..END..\n"); 584 } 585#endif 586 } 587 588 if (issetugid()) 589 statp->options |= RES_NOALIASES; 590 else if ((cp = getenv("RES_OPTIONS")) != NULL) 591 res_setoptions(statp, cp, "env"); 592 statp->options |= RES_INIT; 593 return (statp->res_h_errno); 594} 595 596static void 597res_setoptions(res_state statp, const char *options, const char *source) 598{ 599 const char *cp = options; 600 int i; 601 struct __res_state_ext *ext = statp->_u._ext.ext; 602 603#ifdef DEBUG 604 if (statp->options & RES_DEBUG) 605 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 606 options, source); 607#endif 608 while (*cp) { 609 /* skip leading and inner runs of spaces */ 610 while (*cp == ' ' || *cp == '\t') 611 cp++; 612 /* search for and process individual options */ 613 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 614 i = atoi(cp + sizeof("ndots:") - 1); 615 if (i <= RES_MAXNDOTS) 616 statp->ndots = i; 617 else 618 statp->ndots = RES_MAXNDOTS; 619#ifdef DEBUG 620 if (statp->options & RES_DEBUG) 621 printf(";;\tndots=%d\n", statp->ndots); 622#endif 623 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 624 i = atoi(cp + sizeof("timeout:") - 1); 625 if (i <= RES_MAXRETRANS) 626 statp->retrans = i; 627 else 628 statp->retrans = RES_MAXRETRANS; 629#ifdef DEBUG 630 if (statp->options & RES_DEBUG) 631 printf(";;\ttimeout=%d\n", statp->retrans); 632#endif 633#ifdef SOLARIS2 634 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 635 /* 636 * For backward compatibility, 'retrans' is 637 * supported as an alias for 'timeout', though 638 * without an imposed maximum. 639 */ 640 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 641 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 642 /* 643 * For backward compatibility, 'retry' is 644 * supported as an alias for 'attempts', though 645 * without an imposed maximum. 646 */ 647 statp->retry = atoi(cp + sizeof("retry:") - 1); 648#endif /* SOLARIS2 */ 649 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 650 i = atoi(cp + sizeof("attempts:") - 1); 651 if (i <= RES_MAXRETRY) 652 statp->retry = i; 653 else 654 statp->retry = RES_MAXRETRY; 655#ifdef DEBUG 656 if (statp->options & RES_DEBUG) 657 printf(";;\tattempts=%d\n", statp->retry); 658#endif 659 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 660#ifdef DEBUG 661 if (!(statp->options & RES_DEBUG)) { 662 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 663 options, source); 664 statp->options |= RES_DEBUG; 665 } 666 printf(";;\tdebug\n"); 667#endif 668 } else if (!strncmp(cp, "no_tld_query", 669 sizeof("no_tld_query") - 1) || 670 !strncmp(cp, "no-tld-query", 671 sizeof("no-tld-query") - 1)) { 672 statp->options |= RES_NOTLDQUERY; 673 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 674 statp->options |= RES_USE_INET6; 675 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 676 statp->options |= RES_INSECURE1; 677 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 678 statp->options |= RES_INSECURE2; 679 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 680 statp->options |= RES_ROTATE; 681 } else if (!strncmp(cp, "no-check-names", 682 sizeof("no-check-names") - 1)) { 683 statp->options |= RES_NOCHECKNAME; 684 } else if (!strncmp(cp, "reload-period:", 685 sizeof("reload-period:") - 1)) { 686 if (ext != NULL) { 687 ext->reload_period = (u_short) 688 atoi(cp + sizeof("reload-period:") - 1); 689 } 690 } 691#ifdef RES_USE_EDNS0 692 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 693 statp->options |= RES_USE_EDNS0; 694 } 695#endif 696#ifndef _LIBC 697 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 698 statp->options |= RES_USE_DNAME; 699 } 700 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 701 if (ext == NULL) 702 goto skip; 703 cp += sizeof("nibble:") - 1; 704 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 705 strncpy(ext->nsuffix, cp, i); 706 ext->nsuffix[i] = '\0'; 707 } 708 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 709 if (ext == NULL) 710 goto skip; 711 cp += sizeof("nibble2:") - 1; 712 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 713 strncpy(ext->nsuffix2, cp, i); 714 ext->nsuffix2[i] = '\0'; 715 } 716 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 717 cp += sizeof("v6revmode:") - 1; 718 /* "nibble" and "bitstring" used to be valid */ 719 if (!strncmp(cp, "single", sizeof("single") - 1)) { 720 statp->options |= RES_NO_NIBBLE2; 721 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 722 statp->options &= 723 ~RES_NO_NIBBLE2; 724 } 725 } 726#endif 727 else { 728 /* XXX - print a warning here? */ 729 } 730#ifndef _LIBC 731 skip: 732#endif 733 /* skip to next run of spaces */ 734 while (*cp && *cp != ' ' && *cp != '\t') 735 cp++; 736 } 737} 738 739#ifdef RESOLVSORT 740/* XXX - should really support CIDR which means explicit masks always. */ 741static u_int32_t 742net_mask(in) /*!< XXX - should really use system's version of this */ 743 struct in_addr in; 744{ 745 u_int32_t i = ntohl(in.s_addr); 746 747 if (IN_CLASSA(i)) 748 return (htonl(IN_CLASSA_NET)); 749 else if (IN_CLASSB(i)) 750 return (htonl(IN_CLASSB_NET)); 751 return (htonl(IN_CLASSC_NET)); 752} 753#endif 754 755static u_char srnd[16]; 756 757void 758res_rndinit(res_state statp) 759{ 760 struct timeval now; 761 u_int32_t u32; 762 u_int16_t u16; 763 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 764 765 gettimeofday(&now, NULL); 766 u32 = now.tv_sec; 767 memcpy(rnd, &u32, 4); 768 u32 = now.tv_usec; 769 memcpy(rnd + 4, &u32, 4); 770 u32 += now.tv_sec; 771 memcpy(rnd + 8, &u32, 4); 772 u16 = getpid(); 773 memcpy(rnd + 12, &u16, 2); 774} 775 776u_int 777res_nrandomid(res_state statp) { 778 struct timeval now; 779 u_int16_t u16; 780 MD5_CTX ctx; 781 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 782 783 gettimeofday(&now, NULL); 784 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 785 memcpy(rnd + 14, &u16, 2); 786#ifndef HAVE_MD5 787 MD5_Init(&ctx); 788 MD5_Update(&ctx, rnd, 16); 789 MD5_Final(rnd, &ctx); 790#else 791 MD5Init(&ctx); 792 MD5Update(&ctx, rnd, 16); 793 MD5Final(rnd, &ctx); 794#endif 795 memcpy(&u16, rnd + 14, 2); 796 return ((u_int) u16); 797} 798 799/*% 800 * This routine is for closing the socket if a virtual circuit is used and 801 * the program wants to close it. This provides support for endhostent() 802 * which expects to close the socket. 803 * 804 * This routine is not expected to be user visible. 805 */ 806void 807res_nclose(res_state statp) { 808 int ns; 809 810 if (statp->_vcsock >= 0) { 811 (void) _close(statp->_vcsock); 812 statp->_vcsock = -1; 813 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 814 } 815 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 816 if (statp->_u._ext.nssocks[ns] != -1) { 817 (void) _close(statp->_u._ext.nssocks[ns]); 818 statp->_u._ext.nssocks[ns] = -1; 819 } 820 } 821} 822 823void 824res_ndestroy(res_state statp) { 825 res_nclose(statp); 826 if (statp->_u._ext.ext != NULL) { 827 free(statp->_u._ext.ext); 828 statp->_u._ext.ext = NULL; 829 } 830 if (statp->_rnd != NULL) { 831 free(statp->_rnd); 832 statp->_rnd = NULL; 833 } 834 statp->options &= ~RES_INIT; 835} 836 837#ifndef _LIBC 838const char * 839res_get_nibblesuffix(res_state statp) { 840 if (statp->_u._ext.ext) 841 return (statp->_u._ext.ext->nsuffix); 842 return ("ip6.arpa"); 843} 844 845const char * 846res_get_nibblesuffix2(res_state statp) { 847 if (statp->_u._ext.ext) 848 return (statp->_u._ext.ext->nsuffix2); 849 return ("ip6.int"); 850} 851#endif 852 853void 854res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 855 int i, nserv; 856 size_t size; 857 858 /* close open servers */ 859 res_nclose(statp); 860 861 /* cause rtt times to be forgotten */ 862 statp->_u._ext.nscount = 0; 863 864 nserv = 0; 865 for (i = 0; i < cnt && nserv < MAXNS; i++) { 866 switch (set->sin.sin_family) { 867 case AF_INET: 868 size = sizeof(set->sin); 869 if (statp->_u._ext.ext) 870 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 871 &set->sin, size); 872 if (size <= sizeof(statp->nsaddr_list[nserv])) 873 memcpy(&statp->nsaddr_list[nserv], 874 &set->sin, size); 875 else 876 statp->nsaddr_list[nserv].sin_family = 0; 877 nserv++; 878 break; 879 880#ifdef HAS_INET6_STRUCTS 881 case AF_INET6: 882 size = sizeof(set->sin6); 883 if (statp->_u._ext.ext) 884 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 885 &set->sin6, size); 886 if (size <= sizeof(statp->nsaddr_list[nserv])) 887 memcpy(&statp->nsaddr_list[nserv], 888 &set->sin6, size); 889 else 890 statp->nsaddr_list[nserv].sin_family = 0; 891 nserv++; 892 break; 893#endif 894 895 default: 896 break; 897 } 898 set++; 899 } 900 statp->nscount = nserv; 901 902} 903 904int 905res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 906 int i; 907 size_t size; 908 u_int16_t family; 909 910 for (i = 0; i < statp->nscount && i < cnt; i++) { 911 if (statp->_u._ext.ext) 912 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 913 else 914 family = statp->nsaddr_list[i].sin_family; 915 916 switch (family) { 917 case AF_INET: 918 size = sizeof(set->sin); 919 if (statp->_u._ext.ext) 920 memcpy(&set->sin, 921 &statp->_u._ext.ext->nsaddrs[i], 922 size); 923 else 924 memcpy(&set->sin, &statp->nsaddr_list[i], 925 size); 926 break; 927 928#ifdef HAS_INET6_STRUCTS 929 case AF_INET6: 930 size = sizeof(set->sin6); 931 if (statp->_u._ext.ext) 932 memcpy(&set->sin6, 933 &statp->_u._ext.ext->nsaddrs[i], 934 size); 935 else 936 memcpy(&set->sin6, &statp->nsaddr_list[i], 937 size); 938 break; 939#endif 940 941 default: 942 set->sin.sin_family = 0; 943 break; 944 } 945 set++; 946 } 947 return (statp->nscount); 948} 949 950/*! \file */ 951