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