res_init.c revision 292216
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: head/lib/libc/resolv/res_init.c 292216 2015-12-14 17:21:06Z vangyzen $"); 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#define DEBUG 120 121#ifdef SOLARIS2 122#include <sys/systeminfo.h> 123#endif 124 125static void res_setoptions(res_state, const char *, const char *); 126 127#ifdef RESOLVSORT 128static const char sort_mask[] = "/&"; 129#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 130static u_int32_t net_mask(struct in_addr); 131#endif 132 133#if !defined(isascii) /*%< XXX - could be a function */ 134# define isascii(c) (!(c & 0200)) 135#endif 136 137/* 138 * Resolver state default settings. 139 */ 140 141/*% 142 * Set up default settings. If the configuration file exist, the values 143 * there will have precedence. Otherwise, the server address is set to 144 * INADDR_ANY and the default domain name comes from the gethostname(). 145 * 146 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 147 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 148 * since it was noted that INADDR_ANY actually meant ``the first interface 149 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 150 * it had to be "up" in order for you to reach your own name server. It 151 * was later decided that since the recommended practice is to always 152 * install local static routes through 127.0.0.1 for all your network 153 * interfaces, that we could solve this problem without a code change. 154 * 155 * The configuration file should always be used, since it is the only way 156 * to specify a default domain. If you are running a server on your local 157 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 158 * in the configuration file. 159 * 160 * Return 0 if completes successfully, -1 on error 161 */ 162int 163res_ninit(res_state statp) { 164 extern int __res_vinit(res_state, int); 165 166 return (__res_vinit(statp, 0)); 167} 168 169/*% This function has to be reachable by res_data.c but not publically. */ 170int 171__res_vinit(res_state statp, int preinit) { 172 FILE *fp; 173 char *cp, **pp; 174 int n; 175 char buf[BUFSIZ]; 176 int nserv = 0; /*%< number of nameserver records read from file */ 177 int haveenv = 0; 178 int havesearch = 0; 179#ifdef RESOLVSORT 180 int nsort = 0; 181 char *net; 182#endif 183 int dots; 184 union res_sockaddr_union u[2]; 185 int maxns = MAXNS; 186 187 RES_SET_H_ERRNO(statp, 0); 188 if (statp->_u._ext.ext != NULL) 189 res_ndestroy(statp); 190 191 if (!preinit) { 192 statp->retrans = RES_TIMEOUT; 193 statp->retry = RES_DFLRETRY; 194 statp->options = RES_DEFAULT; 195 } 196 197 statp->_rnd = malloc(16); 198 res_rndinit(statp); 199 statp->id = res_nrandomid(statp); 200 201 memset(u, 0, sizeof(u)); 202#ifdef USELOOPBACK 203 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 204#else 205 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 206#endif 207 u[nserv].sin.sin_family = AF_INET; 208 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 209#ifdef HAVE_SA_LEN 210 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 211#endif 212 nserv++; 213#ifdef HAS_INET6_STRUCTS 214#ifdef USELOOPBACK 215 u[nserv].sin6.sin6_addr = in6addr_loopback; 216#else 217 u[nserv].sin6.sin6_addr = in6addr_any; 218#endif 219 u[nserv].sin6.sin6_family = AF_INET6; 220 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 221#ifdef HAVE_SA_LEN 222 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 223#endif 224 nserv++; 225#endif 226 statp->nscount = 0; 227 statp->ndots = 1; 228 statp->pfcode = 0; 229 statp->_vcsock = -1; 230 statp->_flags = 0; 231 statp->qhook = NULL; 232 statp->rhook = NULL; 233 statp->_u._ext.nscount = 0; 234 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 235 if (statp->_u._ext.ext != NULL) { 236 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 237 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 238 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 239 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 240 statp->_u._ext.ext->reload_period = 2; 241 } else { 242 /* 243 * Historically res_init() rarely, if at all, failed. 244 * Examples and applications exist which do not check 245 * our return code. Furthermore several applications 246 * simply call us to get the systems domainname. So 247 * rather then immediately fail here we store the 248 * failure, which is returned later, in h_errno. And 249 * prevent the collection of 'nameserver' information 250 * by setting maxns to 0. Thus applications that fail 251 * to check our return code wont be able to make 252 * queries anyhow. 253 */ 254 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 255 maxns = 0; 256 } 257#ifdef RESOLVSORT 258 statp->nsort = 0; 259#endif 260 res_setservers(statp, u, nserv); 261 262#ifdef SOLARIS2 263 /* 264 * The old libresolv derived the defaultdomain from NIS/NIS+. 265 * We want to keep this behaviour 266 */ 267 { 268 char buf[sizeof(statp->defdname)], *cp; 269 int ret; 270 271 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 272 (unsigned int)ret <= sizeof(buf)) { 273 if (buf[0] == '+') 274 buf[0] = '.'; 275 cp = strchr(buf, '.'); 276 cp = (cp == NULL) ? buf : (cp + 1); 277 strncpy(statp->defdname, cp, 278 sizeof(statp->defdname) - 1); 279 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 280 } 281 } 282#endif /* SOLARIS2 */ 283 284 /* Allow user to override the local domain definition */ 285 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 286 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 287 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 288 haveenv++; 289 290 /* 291 * Set search list to be blank-separated strings 292 * from rest of env value. Permits users of LOCALDOMAIN 293 * to still have a search list, and anyone to set the 294 * one that they want to use as an individual (even more 295 * important now that the rfc1535 stuff restricts searches) 296 */ 297 cp = statp->defdname; 298 pp = statp->dnsrch; 299 *pp++ = cp; 300 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 301 if (*cp == '\n') /*%< silly backwards compat */ 302 break; 303 else if (*cp == ' ' || *cp == '\t') { 304 *cp = 0; 305 n = 1; 306 } else if (n) { 307 *pp++ = cp; 308 n = 0; 309 havesearch = 1; 310 } 311 } 312 /* null terminate last domain if there are excess */ 313 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 314 cp++; 315 *cp = '\0'; 316 *pp++ = 0; 317 } 318 319#define MATCH(line, name) \ 320 (!strncmp(line, name, sizeof(name) - 1) && \ 321 (line[sizeof(name) - 1] == ' ' || \ 322 line[sizeof(name) - 1] == '\t')) 323 324 nserv = 0; 325 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 326 struct stat sb; 327 struct timespec now; 328 329 if (statp->_u._ext.ext != NULL) { 330 if (_fstat(fileno(fp), &sb) == 0) { 331 statp->_u._ext.ext->conf_mtim = sb.st_mtim; 332 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 333 statp->_u._ext.ext->conf_stat = now.tv_sec; 334 } 335 } 336 } 337 338 /* read the config file */ 339 while (fgets(buf, sizeof(buf), fp) != NULL) { 340 /* skip comments */ 341 if (*buf == ';' || *buf == '#') 342 continue; 343 /* read default domain name */ 344 if (MATCH(buf, "domain")) { 345 if (haveenv) /*%< skip if have from environ */ 346 continue; 347 cp = buf + sizeof("domain") - 1; 348 while (*cp == ' ' || *cp == '\t') 349 cp++; 350 if ((*cp == '\0') || (*cp == '\n')) 351 continue; 352 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 353 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 354 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 355 *cp = '\0'; 356 havesearch = 0; 357 continue; 358 } 359 /* set search list */ 360 if (MATCH(buf, "search")) { 361 if (haveenv) /*%< skip if have from environ */ 362 continue; 363 cp = buf + sizeof("search") - 1; 364 while (*cp == ' ' || *cp == '\t') 365 cp++; 366 if ((*cp == '\0') || (*cp == '\n')) 367 continue; 368 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 369 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 370 if ((cp = strchr(statp->defdname, '\n')) != NULL) 371 *cp = '\0'; 372 /* 373 * Set search list to be blank-separated strings 374 * on rest of line. 375 */ 376 cp = statp->defdname; 377 pp = statp->dnsrch; 378 *pp++ = cp; 379 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 380 if (*cp == ' ' || *cp == '\t') { 381 *cp = 0; 382 n = 1; 383 } else if (n) { 384 *pp++ = cp; 385 n = 0; 386 } 387 } 388 /* null terminate last domain if there are excess */ 389 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 390 cp++; 391 *cp = '\0'; 392 *pp++ = 0; 393 havesearch = 1; 394 continue; 395 } 396 /* read nameservers to query */ 397 if (MATCH(buf, "nameserver") && nserv < maxns) { 398 struct addrinfo hints, *ai; 399 char sbuf[NI_MAXSERV]; 400 const size_t minsiz = 401 sizeof(statp->_u._ext.ext->nsaddrs[0]); 402 403 cp = buf + sizeof("nameserver") - 1; 404 while (*cp == ' ' || *cp == '\t') 405 cp++; 406 cp[strcspn(cp, ";# \t\n")] = '\0'; 407 if ((*cp != '\0') && (*cp != '\n')) { 408 memset(&hints, 0, sizeof(hints)); 409 hints.ai_family = PF_UNSPEC; 410 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 411 hints.ai_flags = AI_NUMERICHOST; 412 sprintf(sbuf, "%u", NAMESERVER_PORT); 413 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 414 ai->ai_addrlen <= minsiz) { 415 if (statp->_u._ext.ext != NULL) { 416 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 417 ai->ai_addr, ai->ai_addrlen); 418 } 419 if (ai->ai_addrlen <= 420 sizeof(statp->nsaddr_list[nserv])) { 421 memcpy(&statp->nsaddr_list[nserv], 422 ai->ai_addr, ai->ai_addrlen); 423 } else 424 statp->nsaddr_list[nserv].sin_family = 0; 425 freeaddrinfo(ai); 426 nserv++; 427 } 428 } 429 continue; 430 } 431#ifdef RESOLVSORT 432 if (MATCH(buf, "sortlist")) { 433 struct in_addr a; 434 struct in6_addr a6; 435 int m, i; 436 u_char *u; 437 struct __res_state_ext *ext = statp->_u._ext.ext; 438 439 cp = buf + sizeof("sortlist") - 1; 440 while (nsort < MAXRESOLVSORT) { 441 while (*cp == ' ' || *cp == '\t') 442 cp++; 443 if (*cp == '\0' || *cp == '\n' || *cp == ';') 444 break; 445 net = cp; 446 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 447 isascii(*cp) && !isspace((unsigned char)*cp)) 448 cp++; 449 n = *cp; 450 *cp = 0; 451 if (inet_aton(net, &a)) { 452 statp->sort_list[nsort].addr = a; 453 if (ISSORTMASK(n)) { 454 *cp++ = n; 455 net = cp; 456 while (*cp && *cp != ';' && 457 isascii(*cp) && 458 !isspace((unsigned char)*cp)) 459 cp++; 460 n = *cp; 461 *cp = 0; 462 if (inet_aton(net, &a)) { 463 statp->sort_list[nsort].mask = a.s_addr; 464 } else { 465 statp->sort_list[nsort].mask = 466 net_mask(statp->sort_list[nsort].addr); 467 } 468 } else { 469 statp->sort_list[nsort].mask = 470 net_mask(statp->sort_list[nsort].addr); 471 } 472 ext->sort_list[nsort].af = AF_INET; 473 ext->sort_list[nsort].addr.ina = 474 statp->sort_list[nsort].addr; 475 ext->sort_list[nsort].mask.ina.s_addr = 476 statp->sort_list[nsort].mask; 477 nsort++; 478 } 479 else if (inet_pton(AF_INET6, net, &a6) == 1) { 480 481 ext->sort_list[nsort].af = AF_INET6; 482 ext->sort_list[nsort].addr.in6a = a6; 483 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 484 *cp++ = n; 485 net = cp; 486 while (*cp && *cp != ';' && 487 isascii(*cp) && !isspace(*cp)) 488 cp++; 489 m = n; 490 n = *cp; 491 *cp = 0; 492 switch (m) { 493 case '/': 494 m = atoi(net); 495 break; 496 case '&': 497 if (inet_pton(AF_INET6, net, u) == 1) { 498 m = -1; 499 break; 500 } 501 /*FALLTHROUGH*/ 502 default: 503 m = sizeof(struct in6_addr) * CHAR_BIT; 504 break; 505 } 506 if (m >= 0) { 507 for (i = 0; i < sizeof(struct in6_addr); i++) { 508 if (m <= 0) { 509 *u = 0; 510 } else { 511 m -= CHAR_BIT; 512 *u = (u_char)~0; 513 if (m < 0) 514 *u <<= -m; 515 } 516 u++; 517 } 518 } 519 statp->sort_list[nsort].addr.s_addr = 520 (u_int32_t)0xffffffff; 521 statp->sort_list[nsort].mask = 522 (u_int32_t)0xffffffff; 523 nsort++; 524 } 525 *cp = n; 526 } 527 continue; 528 } 529#endif 530 if (MATCH(buf, "options")) { 531 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 532 continue; 533 } 534 } 535 if (nserv > 0) 536 statp->nscount = nserv; 537#ifdef RESOLVSORT 538 statp->nsort = nsort; 539#endif 540 (void) fclose(fp); 541 } 542/* 543 * Last chance to get a nameserver. This should not normally 544 * be necessary 545 */ 546#ifdef NO_RESOLV_CONF 547 if(nserv == 0) 548 nserv = get_nameservers(statp); 549#endif 550 551 if (statp->defdname[0] == 0 && 552 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 553 (cp = strchr(buf, '.')) != NULL) 554 strcpy(statp->defdname, cp + 1); 555 556 /* find components of local domain that might be searched */ 557 if (havesearch == 0) { 558 pp = statp->dnsrch; 559 *pp++ = statp->defdname; 560 *pp = NULL; 561 562 dots = 0; 563 for (cp = statp->defdname; *cp; cp++) 564 dots += (*cp == '.'); 565 566 cp = statp->defdname; 567 while (pp < statp->dnsrch + MAXDFLSRCH) { 568 if (dots < LOCALDOMAINPARTS) 569 break; 570 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 571 *pp++ = cp; 572 dots--; 573 } 574 *pp = NULL; 575#ifdef DEBUG 576 if (statp->options & RES_DEBUG) { 577 printf(";; res_init()... default dnsrch list:\n"); 578 for (pp = statp->dnsrch; *pp; pp++) 579 printf(";;\t%s\n", *pp); 580 printf(";;\t..END..\n"); 581 } 582#endif 583 } 584 585 if (issetugid()) 586 statp->options |= RES_NOALIASES; 587 else if ((cp = getenv("RES_OPTIONS")) != NULL) 588 res_setoptions(statp, cp, "env"); 589 statp->options |= RES_INIT; 590 return (statp->res_h_errno); 591} 592 593static void 594res_setoptions(res_state statp, const char *options, const char *source) 595{ 596 const char *cp = options; 597 int i; 598 struct __res_state_ext *ext = statp->_u._ext.ext; 599 600#ifdef DEBUG 601 if (statp->options & RES_DEBUG) 602 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 603 options, source); 604#endif 605 while (*cp) { 606 /* skip leading and inner runs of spaces */ 607 while (*cp == ' ' || *cp == '\t') 608 cp++; 609 /* search for and process individual options */ 610 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 611 i = atoi(cp + sizeof("ndots:") - 1); 612 if (i <= RES_MAXNDOTS) 613 statp->ndots = i; 614 else 615 statp->ndots = RES_MAXNDOTS; 616#ifdef DEBUG 617 if (statp->options & RES_DEBUG) 618 printf(";;\tndots=%d\n", statp->ndots); 619#endif 620 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 621 i = atoi(cp + sizeof("timeout:") - 1); 622 if (i <= RES_MAXRETRANS) 623 statp->retrans = i; 624 else 625 statp->retrans = RES_MAXRETRANS; 626#ifdef DEBUG 627 if (statp->options & RES_DEBUG) 628 printf(";;\ttimeout=%d\n", statp->retrans); 629#endif 630#ifdef SOLARIS2 631 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 632 /* 633 * For backward compatibility, 'retrans' is 634 * supported as an alias for 'timeout', though 635 * without an imposed maximum. 636 */ 637 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 638 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 639 /* 640 * For backward compatibility, 'retry' is 641 * supported as an alias for 'attempts', though 642 * without an imposed maximum. 643 */ 644 statp->retry = atoi(cp + sizeof("retry:") - 1); 645#endif /* SOLARIS2 */ 646 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 647 i = atoi(cp + sizeof("attempts:") - 1); 648 if (i <= RES_MAXRETRY) 649 statp->retry = i; 650 else 651 statp->retry = RES_MAXRETRY; 652#ifdef DEBUG 653 if (statp->options & RES_DEBUG) 654 printf(";;\tattempts=%d\n", statp->retry); 655#endif 656 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 657#ifdef DEBUG 658 if (!(statp->options & RES_DEBUG)) { 659 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 660 options, source); 661 statp->options |= RES_DEBUG; 662 } 663 printf(";;\tdebug\n"); 664#endif 665 } else if (!strncmp(cp, "no_tld_query", 666 sizeof("no_tld_query") - 1) || 667 !strncmp(cp, "no-tld-query", 668 sizeof("no-tld-query") - 1)) { 669 statp->options |= RES_NOTLDQUERY; 670 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 671 statp->options |= RES_USE_INET6; 672 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 673 statp->options |= RES_INSECURE1; 674 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 675 statp->options |= RES_INSECURE2; 676 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 677 statp->options |= RES_ROTATE; 678 } else if (!strncmp(cp, "no-check-names", 679 sizeof("no-check-names") - 1)) { 680 statp->options |= RES_NOCHECKNAME; 681 } else if (!strncmp(cp, "reload-period:", 682 sizeof("reload-period:") - 1)) { 683 if (ext != NULL) { 684 ext->reload_period = (u_short) 685 atoi(cp + sizeof("reload-period:") - 1); 686 } 687 } 688#ifdef RES_USE_EDNS0 689 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 690 statp->options |= RES_USE_EDNS0; 691 } 692#endif 693#ifndef _LIBC 694 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 695 statp->options |= RES_USE_DNAME; 696 } 697 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 698 if (ext == NULL) 699 goto skip; 700 cp += sizeof("nibble:") - 1; 701 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 702 strncpy(ext->nsuffix, cp, i); 703 ext->nsuffix[i] = '\0'; 704 } 705 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 706 if (ext == NULL) 707 goto skip; 708 cp += sizeof("nibble2:") - 1; 709 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 710 strncpy(ext->nsuffix2, cp, i); 711 ext->nsuffix2[i] = '\0'; 712 } 713 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 714 cp += sizeof("v6revmode:") - 1; 715 /* "nibble" and "bitstring" used to be valid */ 716 if (!strncmp(cp, "single", sizeof("single") - 1)) { 717 statp->options |= RES_NO_NIBBLE2; 718 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 719 statp->options &= 720 ~RES_NO_NIBBLE2; 721 } 722 } 723#endif 724 else { 725 /* XXX - print a warning here? */ 726 } 727#ifndef _LIBC 728 skip: 729#endif 730 /* skip to next run of spaces */ 731 while (*cp && *cp != ' ' && *cp != '\t') 732 cp++; 733 } 734} 735 736#ifdef RESOLVSORT 737/* XXX - should really support CIDR which means explicit masks always. */ 738static u_int32_t 739net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 740{ 741 u_int32_t i = ntohl(in.s_addr); 742 743 if (IN_CLASSA(i)) 744 return (htonl(IN_CLASSA_NET)); 745 else if (IN_CLASSB(i)) 746 return (htonl(IN_CLASSB_NET)); 747 return (htonl(IN_CLASSC_NET)); 748} 749#endif 750 751static u_char srnd[16]; 752 753void 754res_rndinit(res_state statp) 755{ 756 struct timeval now; 757 u_int32_t u32; 758 u_int16_t u16; 759 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 760 761 gettimeofday(&now, NULL); 762 u32 = now.tv_sec; 763 memcpy(rnd, &u32, 4); 764 u32 = now.tv_usec; 765 memcpy(rnd + 4, &u32, 4); 766 u32 += now.tv_sec; 767 memcpy(rnd + 8, &u32, 4); 768 u16 = getpid(); 769 memcpy(rnd + 12, &u16, 2); 770} 771 772u_int 773res_nrandomid(res_state statp) { 774 struct timeval now; 775 u_int16_t u16; 776 MD5_CTX ctx; 777 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 778 779 gettimeofday(&now, NULL); 780 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 781 memcpy(rnd + 14, &u16, 2); 782#ifndef HAVE_MD5 783 MD5_Init(&ctx); 784 MD5_Update(&ctx, rnd, 16); 785 MD5_Final(rnd, &ctx); 786#else 787 MD5Init(&ctx); 788 MD5Update(&ctx, rnd, 16); 789 MD5Final(rnd, &ctx); 790#endif 791 memcpy(&u16, rnd + 14, 2); 792 return ((u_int) u16); 793} 794 795/*% 796 * This routine is for closing the socket if a virtual circuit is used and 797 * the program wants to close it. This provides support for endhostent() 798 * which expects to close the socket. 799 * 800 * This routine is not expected to be user visible. 801 */ 802void 803res_nclose(res_state statp) { 804 int ns; 805 806 if (statp->_vcsock >= 0) { 807 (void) _close(statp->_vcsock); 808 statp->_vcsock = -1; 809 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 810 } 811 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 812 if (statp->_u._ext.nssocks[ns] != -1) { 813 (void) _close(statp->_u._ext.nssocks[ns]); 814 statp->_u._ext.nssocks[ns] = -1; 815 } 816 } 817} 818 819void 820res_ndestroy(res_state statp) { 821 res_nclose(statp); 822 if (statp->_u._ext.ext != NULL) { 823 free(statp->_u._ext.ext); 824 statp->_u._ext.ext = NULL; 825 } 826 if (statp->_rnd != NULL) { 827 free(statp->_rnd); 828 statp->_rnd = NULL; 829 } 830 statp->options &= ~RES_INIT; 831} 832 833#ifndef _LIBC 834const char * 835res_get_nibblesuffix(res_state statp) { 836 if (statp->_u._ext.ext) 837 return (statp->_u._ext.ext->nsuffix); 838 return ("ip6.arpa"); 839} 840 841const char * 842res_get_nibblesuffix2(res_state statp) { 843 if (statp->_u._ext.ext) 844 return (statp->_u._ext.ext->nsuffix2); 845 return ("ip6.int"); 846} 847#endif 848 849void 850res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 851 int i, nserv; 852 size_t size; 853 854 /* close open servers */ 855 res_nclose(statp); 856 857 /* cause rtt times to be forgotten */ 858 statp->_u._ext.nscount = 0; 859 860 nserv = 0; 861 for (i = 0; i < cnt && nserv < MAXNS; i++) { 862 switch (set->sin.sin_family) { 863 case AF_INET: 864 size = sizeof(set->sin); 865 if (statp->_u._ext.ext) 866 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 867 &set->sin, size); 868 if (size <= sizeof(statp->nsaddr_list[nserv])) 869 memcpy(&statp->nsaddr_list[nserv], 870 &set->sin, size); 871 else 872 statp->nsaddr_list[nserv].sin_family = 0; 873 nserv++; 874 break; 875 876#ifdef HAS_INET6_STRUCTS 877 case AF_INET6: 878 size = sizeof(set->sin6); 879 if (statp->_u._ext.ext) 880 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 881 &set->sin6, size); 882 if (size <= sizeof(statp->nsaddr_list[nserv])) 883 memcpy(&statp->nsaddr_list[nserv], 884 &set->sin6, size); 885 else 886 statp->nsaddr_list[nserv].sin_family = 0; 887 nserv++; 888 break; 889#endif 890 891 default: 892 break; 893 } 894 set++; 895 } 896 statp->nscount = nserv; 897 898} 899 900int 901res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 902 int i; 903 size_t size; 904 u_int16_t family; 905 906 for (i = 0; i < statp->nscount && i < cnt; i++) { 907 if (statp->_u._ext.ext) 908 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 909 else 910 family = statp->nsaddr_list[i].sin_family; 911 912 switch (family) { 913 case AF_INET: 914 size = sizeof(set->sin); 915 if (statp->_u._ext.ext) 916 memcpy(&set->sin, 917 &statp->_u._ext.ext->nsaddrs[i], 918 size); 919 else 920 memcpy(&set->sin, &statp->nsaddr_list[i], 921 size); 922 break; 923 924#ifdef HAS_INET6_STRUCTS 925 case AF_INET6: 926 size = sizeof(set->sin6); 927 if (statp->_u._ext.ext) 928 memcpy(&set->sin6, 929 &statp->_u._ext.ext->nsaddrs[i], 930 size); 931 else 932 memcpy(&set->sin6, &statp->nsaddr_list[i], 933 size); 934 break; 935#endif 936 937 default: 938 set->sin.sin_family = 0; 939 break; 940 } 941 set++; 942 } 943 return (statp->nscount); 944} 945 946/*! \file */ 947