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