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