1 /* 2 * Copyright (c) 1985, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 */ 49 50 /* 51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 53 * 54 * Permission to use, copy, modify, and distribute this software for any 55 * purpose with or without fee is hereby granted, provided that the above 56 * copyright notice and this permission notice appear in all copies. 57 * 58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 65 */ 66 67 #if defined(LIBC_SCCS) && !defined(lint) 68 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 69 static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $"; 70 #endif /* LIBC_SCCS and not lint */ 71 #include <sys/cdefs.h> 72 __FBSDID("$FreeBSD$"); 73 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 interrim 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 publically. */ 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 #ifdef USELOOPBACK 204 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 205 #else 206 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 207 #endif 208 u[nserv].sin.sin_family = AF_INET; 209 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 210 #ifdef HAVE_SA_LEN 211 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 212 #endif 213 nserv++; 214 #ifdef HAS_INET6_STRUCTS 215 #ifdef USELOOPBACK 216 u[nserv].sin6.sin6_addr = in6addr_loopback; 217 #else 218 u[nserv].sin6.sin6_addr = in6addr_any; 219 #endif 220 u[nserv].sin6.sin6_family = AF_INET6; 221 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 222 #ifdef HAVE_SA_LEN 223 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 224 #endif 225 nserv++; 226 #endif 227 statp->nscount = 0; 228 statp->ndots = 1; 229 statp->pfcode = 0; 230 statp->_vcsock = -1; 231 statp->_flags = 0; 232 statp->qhook = NULL; 233 statp->rhook = NULL; 234 statp->_u._ext.nscount = 0; 235 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 236 if (statp->_u._ext.ext != NULL) { 237 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 238 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 239 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 240 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 241 statp->_u._ext.ext->reload_period = 2; 242 } else { 243 /* 244 * Historically res_init() rarely, if at all, failed. 245 * Examples and applications exist which do not check 246 * our return code. Furthermore several applications 247 * simply call us to get the systems domainname. So 248 * rather then immediately fail here we store the 249 * failure, which is returned later, in h_errno. And 250 * prevent the collection of 'nameserver' information 251 * by setting maxns to 0. Thus applications that fail 252 * to check our return code wont be able to make 253 * queries anyhow. 254 */ 255 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 256 maxns = 0; 257 } 258 #ifdef RESOLVSORT 259 statp->nsort = 0; 260 #endif 261 res_setservers(statp, u, nserv); 262 263 #ifdef SOLARIS2 264 /* 265 * The old libresolv derived the defaultdomain from NIS/NIS+. 266 * We want to keep this behaviour 267 */ 268 { 269 char buf[sizeof(statp->defdname)], *cp; 270 int ret; 271 272 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 273 (unsigned int)ret <= sizeof(buf)) { 274 if (buf[0] == '+') 275 buf[0] = '.'; 276 cp = strchr(buf, '.'); 277 cp = (cp == NULL) ? buf : (cp + 1); 278 strncpy(statp->defdname, cp, 279 sizeof(statp->defdname) - 1); 280 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 281 } 282 } 283 #endif /* SOLARIS2 */ 284 285 /* Allow user to override the local domain definition */ 286 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 287 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 288 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 289 haveenv++; 290 291 /* 292 * Set search list to be blank-separated strings 293 * from rest of env value. Permits users of LOCALDOMAIN 294 * to still have a search list, and anyone to set the 295 * one that they want to use as an individual (even more 296 * important now that the rfc1535 stuff restricts searches) 297 */ 298 cp = statp->defdname; 299 pp = statp->dnsrch; 300 *pp++ = cp; 301 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 302 if (*cp == '\n') /*%< silly backwards compat */ 303 break; 304 else if (*cp == ' ' || *cp == '\t') { 305 *cp = 0; 306 n = 1; 307 } else if (n) { 308 *pp++ = cp; 309 n = 0; 310 havesearch = 1; 311 } 312 } 313 /* null terminate last domain if there are excess */ 314 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 315 cp++; 316 *cp = '\0'; 317 *pp++ = NULL; 318 } 319 320 #define MATCH(line, name) \ 321 (!strncmp(line, name, sizeof(name) - 1) && \ 322 (line[sizeof(name) - 1] == ' ' || \ 323 line[sizeof(name) - 1] == '\t')) 324 325 nserv = 0; 326 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 327 struct stat sb; 328 struct timespec now; 329 330 if (statp->_u._ext.ext != NULL) { 331 if (_fstat(fileno(fp), &sb) == 0) { 332 statp->_u._ext.ext->conf_mtim = sb.st_mtim; 333 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 334 statp->_u._ext.ext->conf_stat = now.tv_sec; 335 } 336 } 337 } 338 339 /* read the config file */ 340 while (fgets(buf, sizeof(buf), fp) != NULL) { 341 /* skip comments */ 342 if (*buf == ';' || *buf == '#') 343 continue; 344 /* read default domain name */ 345 if (MATCH(buf, "domain")) { 346 if (haveenv) /*%< skip if have from environ */ 347 continue; 348 cp = buf + sizeof("domain") - 1; 349 while (*cp == ' ' || *cp == '\t') 350 cp++; 351 if ((*cp == '\0') || (*cp == '\n')) 352 continue; 353 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 354 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 355 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 356 *cp = '\0'; 357 havesearch = 0; 358 continue; 359 } 360 /* set search list */ 361 if (MATCH(buf, "search")) { 362 if (haveenv) /*%< skip if have from environ */ 363 continue; 364 cp = buf + sizeof("search") - 1; 365 while (*cp == ' ' || *cp == '\t') 366 cp++; 367 if ((*cp == '\0') || (*cp == '\n')) 368 continue; 369 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 370 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 371 if ((cp = strchr(statp->defdname, '\n')) != NULL) 372 *cp = '\0'; 373 /* 374 * Set search list to be blank-separated strings 375 * on rest of line. 376 */ 377 cp = statp->defdname; 378 pp = statp->dnsrch; 379 *pp++ = cp; 380 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 381 if (*cp == ' ' || *cp == '\t') { 382 *cp = 0; 383 n = 1; 384 } else if (n) { 385 *pp++ = cp; 386 n = 0; 387 } 388 } 389 /* null terminate last domain if there are excess */ 390 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 391 cp++; 392 *cp = '\0'; 393 *pp++ = NULL; 394 havesearch = 1; 395 continue; 396 } 397 /* read nameservers to query */ 398 if (MATCH(buf, "nameserver") && nserv < maxns) { 399 struct addrinfo hints, *ai; 400 char sbuf[NI_MAXSERV]; 401 const size_t minsiz = 402 sizeof(statp->_u._ext.ext->nsaddrs[0]); 403 404 cp = buf + sizeof("nameserver") - 1; 405 while (*cp == ' ' || *cp == '\t') 406 cp++; 407 cp[strcspn(cp, ";# \t\n")] = '\0'; 408 if ((*cp != '\0') && (*cp != '\n')) { 409 memset(&hints, 0, sizeof(hints)); 410 hints.ai_family = PF_UNSPEC; 411 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 412 hints.ai_flags = AI_NUMERICHOST; 413 sprintf(sbuf, "%u", NAMESERVER_PORT); 414 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 415 ai->ai_addrlen <= minsiz) { 416 if (statp->_u._ext.ext != NULL) { 417 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 418 ai->ai_addr, ai->ai_addrlen); 419 } 420 if (ai->ai_addrlen <= 421 sizeof(statp->nsaddr_list[nserv])) { 422 memcpy(&statp->nsaddr_list[nserv], 423 ai->ai_addr, ai->ai_addrlen); 424 } else 425 statp->nsaddr_list[nserv].sin_family = 0; 426 freeaddrinfo(ai); 427 nserv++; 428 } 429 } 430 continue; 431 } 432 #ifdef RESOLVSORT 433 if (MATCH(buf, "sortlist")) { 434 struct in_addr a; 435 struct in6_addr a6; 436 int m, i; 437 u_char *u; 438 struct __res_state_ext *ext = statp->_u._ext.ext; 439 440 cp = buf + sizeof("sortlist") - 1; 441 while (nsort < MAXRESOLVSORT) { 442 while (*cp == ' ' || *cp == '\t') 443 cp++; 444 if (*cp == '\0' || *cp == '\n' || *cp == ';') 445 break; 446 net = cp; 447 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 448 isascii(*cp) && !isspace((unsigned char)*cp)) 449 cp++; 450 n = *cp; 451 *cp = 0; 452 if (inet_aton(net, &a)) { 453 statp->sort_list[nsort].addr = a; 454 if (ISSORTMASK(n)) { 455 *cp++ = n; 456 net = cp; 457 while (*cp && *cp != ';' && 458 isascii(*cp) && 459 !isspace((unsigned char)*cp)) 460 cp++; 461 n = *cp; 462 *cp = 0; 463 if (inet_aton(net, &a)) { 464 statp->sort_list[nsort].mask = a.s_addr; 465 } else { 466 statp->sort_list[nsort].mask = 467 net_mask(statp->sort_list[nsort].addr); 468 } 469 } else { 470 statp->sort_list[nsort].mask = 471 net_mask(statp->sort_list[nsort].addr); 472 } 473 ext->sort_list[nsort].af = AF_INET; 474 ext->sort_list[nsort].addr.ina = 475 statp->sort_list[nsort].addr; 476 ext->sort_list[nsort].mask.ina.s_addr = 477 statp->sort_list[nsort].mask; 478 nsort++; 479 } 480 else if (inet_pton(AF_INET6, net, &a6) == 1) { 481 482 ext->sort_list[nsort].af = AF_INET6; 483 ext->sort_list[nsort].addr.in6a = a6; 484 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 485 *cp++ = n; 486 net = cp; 487 while (*cp && *cp != ';' && 488 isascii(*cp) && !isspace(*cp)) 489 cp++; 490 m = n; 491 n = *cp; 492 *cp = 0; 493 switch (m) { 494 case '/': 495 m = atoi(net); 496 break; 497 case '&': 498 if (inet_pton(AF_INET6, net, u) == 1) { 499 m = -1; 500 break; 501 } 502 /*FALLTHROUGH*/ 503 default: 504 m = sizeof(struct in6_addr) * CHAR_BIT; 505 break; 506 } 507 if (m >= 0) { 508 for (i = 0; i < sizeof(struct in6_addr); i++) { 509 if (m <= 0) { 510 *u = 0; 511 } else { 512 m -= CHAR_BIT; 513 *u = (u_char)~0; 514 if (m < 0) 515 *u <<= -m; 516 } 517 u++; 518 } 519 } 520 statp->sort_list[nsort].addr.s_addr = 521 (u_int32_t)0xffffffff; 522 statp->sort_list[nsort].mask = 523 (u_int32_t)0xffffffff; 524 nsort++; 525 } 526 *cp = n; 527 } 528 continue; 529 } 530 #endif 531 if (MATCH(buf, "options")) { 532 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 533 continue; 534 } 535 } 536 if (nserv > 0) 537 statp->nscount = nserv; 538 #ifdef RESOLVSORT 539 statp->nsort = nsort; 540 #endif 541 (void) fclose(fp); 542 } 543 /* 544 * Last chance to get a nameserver. This should not normally 545 * be necessary 546 */ 547 #ifdef NO_RESOLV_CONF 548 if(nserv == 0) 549 nserv = get_nameservers(statp); 550 #endif 551 552 if (statp->defdname[0] == 0 && 553 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 554 (cp = strchr(buf, '.')) != NULL) 555 strcpy(statp->defdname, cp + 1); 556 557 /* find components of local domain that might be searched */ 558 if (havesearch == 0) { 559 pp = statp->dnsrch; 560 *pp++ = statp->defdname; 561 *pp = NULL; 562 563 dots = 0; 564 for (cp = statp->defdname; *cp; cp++) 565 dots += (*cp == '.'); 566 567 cp = statp->defdname; 568 while (pp < statp->dnsrch + MAXDFLSRCH) { 569 if (dots < LOCALDOMAINPARTS) 570 break; 571 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 572 *pp++ = cp; 573 dots--; 574 } 575 *pp = NULL; 576 #ifdef DEBUG 577 if (statp->options & RES_DEBUG) { 578 printf(";; res_init()... default dnsrch list:\n"); 579 for (pp = statp->dnsrch; *pp; pp++) 580 printf(";;\t%s\n", *pp); 581 printf(";;\t..END..\n"); 582 } 583 #endif 584 } 585 586 if (issetugid()) 587 statp->options |= RES_NOALIASES; 588 else if ((cp = getenv("RES_OPTIONS")) != NULL) 589 res_setoptions(statp, cp, "env"); 590 statp->options |= RES_INIT; 591 return (statp->res_h_errno); 592 } 593 594 static void 595 res_setoptions(res_state statp, const char *options, const char *source) 596 { 597 const char *cp = options; 598 int i; 599 struct __res_state_ext *ext = statp->_u._ext.ext; 600 601 #ifdef DEBUG 602 if (statp->options & RES_DEBUG) 603 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 604 options, source); 605 #endif 606 while (*cp) { 607 /* skip leading and inner runs of spaces */ 608 while (*cp == ' ' || *cp == '\t') 609 cp++; 610 /* search for and process individual options */ 611 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 612 i = atoi(cp + sizeof("ndots:") - 1); 613 if (i <= RES_MAXNDOTS) 614 statp->ndots = i; 615 else 616 statp->ndots = RES_MAXNDOTS; 617 #ifdef DEBUG 618 if (statp->options & RES_DEBUG) 619 printf(";;\tndots=%d\n", statp->ndots); 620 #endif 621 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 622 i = atoi(cp + sizeof("timeout:") - 1); 623 if (i <= RES_MAXRETRANS) 624 statp->retrans = i; 625 else 626 statp->retrans = RES_MAXRETRANS; 627 #ifdef DEBUG 628 if (statp->options & RES_DEBUG) 629 printf(";;\ttimeout=%d\n", statp->retrans); 630 #endif 631 #ifdef SOLARIS2 632 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 633 /* 634 * For backward compatibility, 'retrans' is 635 * supported as an alias for 'timeout', though 636 * without an imposed maximum. 637 */ 638 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 639 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 640 /* 641 * For backward compatibility, 'retry' is 642 * supported as an alias for 'attempts', though 643 * without an imposed maximum. 644 */ 645 statp->retry = atoi(cp + sizeof("retry:") - 1); 646 #endif /* SOLARIS2 */ 647 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 648 i = atoi(cp + sizeof("attempts:") - 1); 649 if (i <= RES_MAXRETRY) 650 statp->retry = i; 651 else 652 statp->retry = RES_MAXRETRY; 653 #ifdef DEBUG 654 if (statp->options & RES_DEBUG) 655 printf(";;\tattempts=%d\n", statp->retry); 656 #endif 657 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 658 #ifdef DEBUG 659 if (!(statp->options & RES_DEBUG)) { 660 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 661 options, source); 662 statp->options |= RES_DEBUG; 663 } 664 printf(";;\tdebug\n"); 665 #endif 666 } else if (!strncmp(cp, "no_tld_query", 667 sizeof("no_tld_query") - 1) || 668 !strncmp(cp, "no-tld-query", 669 sizeof("no-tld-query") - 1)) { 670 statp->options |= RES_NOTLDQUERY; 671 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 672 statp->options |= RES_USE_INET6; 673 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 674 statp->options |= RES_INSECURE1; 675 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 676 statp->options |= RES_INSECURE2; 677 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 678 statp->options |= RES_ROTATE; 679 } else if (!strncmp(cp, "no-check-names", 680 sizeof("no-check-names") - 1)) { 681 statp->options |= RES_NOCHECKNAME; 682 } else if (!strncmp(cp, "reload-period:", 683 sizeof("reload-period:") - 1)) { 684 if (ext != NULL) { 685 ext->reload_period = (u_short) 686 atoi(cp + sizeof("reload-period:") - 1); 687 } 688 } 689 #ifdef RES_USE_EDNS0 690 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 691 statp->options |= RES_USE_EDNS0; 692 } 693 #endif 694 #ifndef _LIBC 695 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 696 statp->options |= RES_USE_DNAME; 697 } 698 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 699 if (ext == NULL) 700 goto skip; 701 cp += sizeof("nibble:") - 1; 702 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 703 strncpy(ext->nsuffix, cp, i); 704 ext->nsuffix[i] = '\0'; 705 } 706 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 707 if (ext == NULL) 708 goto skip; 709 cp += sizeof("nibble2:") - 1; 710 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 711 strncpy(ext->nsuffix2, cp, i); 712 ext->nsuffix2[i] = '\0'; 713 } 714 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 715 cp += sizeof("v6revmode:") - 1; 716 /* "nibble" and "bitstring" used to be valid */ 717 if (!strncmp(cp, "single", sizeof("single") - 1)) { 718 statp->options |= RES_NO_NIBBLE2; 719 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 720 statp->options &= 721 ~RES_NO_NIBBLE2; 722 } 723 } 724 #endif 725 else { 726 /* XXX - print a warning here? */ 727 } 728 #ifndef _LIBC 729 skip: 730 #endif 731 /* skip to next run of spaces */ 732 while (*cp && *cp != ' ' && *cp != '\t') 733 cp++; 734 } 735 } 736 737 #ifdef RESOLVSORT 738 /* XXX - should really support CIDR which means explicit masks always. */ 739 static u_int32_t 740 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 741 { 742 u_int32_t i = ntohl(in.s_addr); 743 744 if (IN_CLASSA(i)) 745 return (htonl(IN_CLASSA_NET)); 746 else if (IN_CLASSB(i)) 747 return (htonl(IN_CLASSB_NET)); 748 return (htonl(IN_CLASSC_NET)); 749 } 750 #endif 751 752 static u_char srnd[16]; 753 754 void 755 res_rndinit(res_state statp) 756 { 757 struct timeval now; 758 u_int32_t u32; 759 u_int16_t u16; 760 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 761 762 gettimeofday(&now, NULL); 763 u32 = now.tv_sec; 764 memcpy(rnd, &u32, 4); 765 u32 = now.tv_usec; 766 memcpy(rnd + 4, &u32, 4); 767 u32 += now.tv_sec; 768 memcpy(rnd + 8, &u32, 4); 769 u16 = getpid(); 770 memcpy(rnd + 12, &u16, 2); 771 } 772 773 u_int 774 res_nrandomid(res_state statp) { 775 struct timeval now; 776 u_int16_t u16; 777 MD5_CTX ctx; 778 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 779 780 gettimeofday(&now, NULL); 781 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 782 memcpy(rnd + 14, &u16, 2); 783 #ifndef HAVE_MD5 784 MD5_Init(&ctx); 785 MD5_Update(&ctx, rnd, 16); 786 MD5_Final(rnd, &ctx); 787 #else 788 MD5Init(&ctx); 789 MD5Update(&ctx, rnd, 16); 790 MD5Final(rnd, &ctx); 791 #endif 792 memcpy(&u16, rnd + 14, 2); 793 return ((u_int) u16); 794 } 795 796 /*% 797 * This routine is for closing the socket if a virtual circuit is used and 798 * the program wants to close it. This provides support for endhostent() 799 * which expects to close the socket. 800 * 801 * This routine is not expected to be user visible. 802 */ 803 void 804 res_nclose(res_state statp) { 805 int ns; 806 807 if (statp->_vcsock >= 0) { 808 (void) _close(statp->_vcsock); 809 statp->_vcsock = -1; 810 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 811 } 812 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 813 if (statp->_u._ext.nssocks[ns] != -1) { 814 (void) _close(statp->_u._ext.nssocks[ns]); 815 statp->_u._ext.nssocks[ns] = -1; 816 } 817 } 818 } 819 820 void 821 res_ndestroy(res_state statp) { 822 res_nclose(statp); 823 if (statp->_u._ext.ext != NULL) { 824 free(statp->_u._ext.ext); 825 statp->_u._ext.ext = NULL; 826 } 827 if (statp->_rnd != NULL) { 828 free(statp->_rnd); 829 statp->_rnd = NULL; 830 } 831 statp->options &= ~RES_INIT; 832 } 833 834 #ifndef _LIBC 835 const char * 836 res_get_nibblesuffix(res_state statp) { 837 if (statp->_u._ext.ext) 838 return (statp->_u._ext.ext->nsuffix); 839 return ("ip6.arpa"); 840 } 841 842 const char * 843 res_get_nibblesuffix2(res_state statp) { 844 if (statp->_u._ext.ext) 845 return (statp->_u._ext.ext->nsuffix2); 846 return ("ip6.int"); 847 } 848 #endif 849 850 void 851 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 852 int i, nserv; 853 size_t size; 854 855 /* close open servers */ 856 res_nclose(statp); 857 858 /* cause rtt times to be forgotten */ 859 statp->_u._ext.nscount = 0; 860 861 nserv = 0; 862 for (i = 0; i < cnt && nserv < MAXNS; i++) { 863 switch (set->sin.sin_family) { 864 case AF_INET: 865 size = sizeof(set->sin); 866 if (statp->_u._ext.ext) 867 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 868 &set->sin, size); 869 if (size <= sizeof(statp->nsaddr_list[nserv])) 870 memcpy(&statp->nsaddr_list[nserv], 871 &set->sin, size); 872 else 873 statp->nsaddr_list[nserv].sin_family = 0; 874 nserv++; 875 break; 876 877 #ifdef HAS_INET6_STRUCTS 878 case AF_INET6: 879 size = sizeof(set->sin6); 880 if (statp->_u._ext.ext) 881 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 882 &set->sin6, size); 883 if (size <= sizeof(statp->nsaddr_list[nserv])) 884 memcpy(&statp->nsaddr_list[nserv], 885 &set->sin6, size); 886 else 887 statp->nsaddr_list[nserv].sin_family = 0; 888 nserv++; 889 break; 890 #endif 891 892 default: 893 break; 894 } 895 set++; 896 } 897 statp->nscount = nserv; 898 899 } 900 901 int 902 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 903 int i; 904 size_t size; 905 u_int16_t family; 906 907 for (i = 0; i < statp->nscount && i < cnt; i++) { 908 if (statp->_u._ext.ext) 909 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 910 else 911 family = statp->nsaddr_list[i].sin_family; 912 913 switch (family) { 914 case AF_INET: 915 size = sizeof(set->sin); 916 if (statp->_u._ext.ext) 917 memcpy(&set->sin, 918 &statp->_u._ext.ext->nsaddrs[i], 919 size); 920 else 921 memcpy(&set->sin, &statp->nsaddr_list[i], 922 size); 923 break; 924 925 #ifdef HAS_INET6_STRUCTS 926 case AF_INET6: 927 size = sizeof(set->sin6); 928 if (statp->_u._ext.ext) 929 memcpy(&set->sin6, 930 &statp->_u._ext.ext->nsaddrs[i], 931 size); 932 else 933 memcpy(&set->sin6, &statp->nsaddr_list[i], 934 size); 935 break; 936 #endif 937 938 default: 939 set->sin.sin_family = 0; 940 break; 941 } 942 set++; 943 } 944 return (statp->nscount); 945 } 946 947 /*! \file */ 948