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