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/types.h> 79 #include <sys/param.h> 80 #include <sys/socket.h> 81 #include <sys/stat.h> 82 #include <sys/time.h> 83 84 #include <netinet/in.h> 85 #include <arpa/inet.h> 86 #include <arpa/nameser.h> 87 88 #include <ctype.h> 89 #include <stdio.h> 90 #include <stdlib.h> 91 #include <string.h> 92 #include <unistd.h> 93 #include <netdb.h> 94 95 #ifndef HAVE_MD5 96 # include "../dst/md5.h" 97 #else 98 # ifdef SOLARIS2 99 # include <sys/md5.h> 100 # elif _LIBC 101 # include <md5.h> 102 # endif 103 #endif 104 #ifndef _MD5_H_ 105 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 106 #endif 107 108 #include "un-namespace.h" 109 110 #include "port_after.h" 111 112 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 113 #include <resolv.h> 114 115 #include "res_private.h" 116 117 /*% Options. Should all be left alone. */ 118 #define RESOLVSORT 119 #define DEBUG 120 121 #ifdef SOLARIS2 122 #include <sys/systeminfo.h> 123 #endif 124 125 static void res_setoptions(res_state, const char *, const char *); 126 127 #ifdef RESOLVSORT 128 static const char sort_mask[] = "/&"; 129 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 130 static u_int32_t net_mask(struct in_addr); 131 #endif 132 133 #if !defined(isascii) /*%< XXX - could be a function */ 134 # define isascii(c) (!(c & 0200)) 135 #endif 136 137 /* 138 * Resolver state default settings. 139 */ 140 141 /*% 142 * Set up default settings. If the configuration file exist, the values 143 * there will have precedence. Otherwise, the server address is set to 144 * INADDR_ANY and the default domain name comes from the gethostname(). 145 * 146 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 147 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 148 * since it was noted that INADDR_ANY actually meant ``the first interface 149 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 150 * it had to be "up" in order for you to reach your own name server. It 151 * was later decided that since the recommended practice is to always 152 * install local static routes through 127.0.0.1 for all your network 153 * interfaces, that we could solve this problem without a code change. 154 * 155 * The configuration file should always be used, since it is the only way 156 * to specify a default domain. If you are running a server on your local 157 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 158 * in the configuration file. 159 * 160 * Return 0 if completes successfully, -1 on error 161 */ 162 int 163 res_ninit(res_state statp) { 164 extern int __res_vinit(res_state, int); 165 166 return (__res_vinit(statp, 0)); 167 } 168 169 /*% This function has to be reachable by res_data.c but not publically. */ 170 int 171 __res_vinit(res_state statp, int preinit) { 172 FILE *fp; 173 char *cp, **pp; 174 int n; 175 char buf[BUFSIZ]; 176 int nserv = 0; /*%< number of nameserver records read from file */ 177 int haveenv = 0; 178 int havesearch = 0; 179 #ifdef RESOLVSORT 180 int nsort = 0; 181 char *net; 182 #endif 183 int dots; 184 union res_sockaddr_union u[2]; 185 int maxns = MAXNS; 186 187 RES_SET_H_ERRNO(statp, 0); 188 if (statp->_u._ext.ext != NULL) 189 res_ndestroy(statp); 190 191 if (!preinit) { 192 statp->retrans = RES_TIMEOUT; 193 statp->retry = RES_DFLRETRY; 194 statp->options = RES_DEFAULT; 195 } 196 197 statp->_rnd = malloc(16); 198 res_rndinit(statp); 199 statp->id = res_nrandomid(statp); 200 201 memset(u, 0, sizeof(u)); 202 #ifdef USELOOPBACK 203 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 204 #else 205 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 206 #endif 207 u[nserv].sin.sin_family = AF_INET; 208 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 209 #ifdef HAVE_SA_LEN 210 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 211 #endif 212 nserv++; 213 #ifdef HAS_INET6_STRUCTS 214 #ifdef USELOOPBACK 215 u[nserv].sin6.sin6_addr = in6addr_loopback; 216 #else 217 u[nserv].sin6.sin6_addr = in6addr_any; 218 #endif 219 u[nserv].sin6.sin6_family = AF_INET6; 220 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 221 #ifdef HAVE_SA_LEN 222 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 223 #endif 224 nserv++; 225 #endif 226 statp->nscount = 0; 227 statp->ndots = 1; 228 statp->pfcode = 0; 229 statp->_vcsock = -1; 230 statp->_flags = 0; 231 statp->reload_period = 2; 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 } else { 242 /* 243 * Historically res_init() rarely, if at all, failed. 244 * Examples and applications exist which do not check 245 * our return code. Furthermore several applications 246 * simply call us to get the systems domainname. So 247 * rather then immediately fail here we store the 248 * failure, which is returned later, in h_errno. And 249 * prevent the collection of 'nameserver' information 250 * by setting maxns to 0. Thus applications that fail 251 * to check our return code wont be able to make 252 * queries anyhow. 253 */ 254 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 255 maxns = 0; 256 } 257 #ifdef RESOLVSORT 258 statp->nsort = 0; 259 #endif 260 res_setservers(statp, u, nserv); 261 262 #ifdef SOLARIS2 263 /* 264 * The old libresolv derived the defaultdomain from NIS/NIS+. 265 * We want to keep this behaviour 266 */ 267 { 268 char buf[sizeof(statp->defdname)], *cp; 269 int ret; 270 271 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 272 (unsigned int)ret <= sizeof(buf)) { 273 if (buf[0] == '+') 274 buf[0] = '.'; 275 cp = strchr(buf, '.'); 276 cp = (cp == NULL) ? buf : (cp + 1); 277 strncpy(statp->defdname, cp, 278 sizeof(statp->defdname) - 1); 279 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 280 } 281 } 282 #endif /* SOLARIS2 */ 283 284 /* Allow user to override the local domain definition */ 285 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 286 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 287 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 288 haveenv++; 289 290 /* 291 * Set search list to be blank-separated strings 292 * from rest of env value. Permits users of LOCALDOMAIN 293 * to still have a search list, and anyone to set the 294 * one that they want to use as an individual (even more 295 * important now that the rfc1535 stuff restricts searches) 296 */ 297 cp = statp->defdname; 298 pp = statp->dnsrch; 299 *pp++ = cp; 300 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 301 if (*cp == '\n') /*%< silly backwards compat */ 302 break; 303 else if (*cp == ' ' || *cp == '\t') { 304 *cp = 0; 305 n = 1; 306 } else if (n) { 307 *pp++ = cp; 308 n = 0; 309 havesearch = 1; 310 } 311 } 312 /* null terminate last domain if there are excess */ 313 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 314 cp++; 315 *cp = '\0'; 316 *pp++ = 0; 317 } 318 319 #define MATCH(line, name) \ 320 (!strncmp(line, name, sizeof(name) - 1) && \ 321 (line[sizeof(name) - 1] == ' ' || \ 322 line[sizeof(name) - 1] == '\t')) 323 324 nserv = 0; 325 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 326 struct stat sb; 327 struct timespec now; 328 329 if (_fstat(fileno(fp), &sb) == 0) { 330 statp->conf_mtim = sb.st_mtim; 331 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 332 statp->conf_stat = now.tv_sec; 333 } else { 334 statp->conf_stat = 0; 335 } 336 } else { 337 statp->conf_mtim.tv_sec = 0; 338 statp->conf_mtim.tv_nsec = 0; 339 statp->conf_stat = 0; 340 } 341 342 /* read the config file */ 343 while (fgets(buf, sizeof(buf), fp) != NULL) { 344 /* skip comments */ 345 if (*buf == ';' || *buf == '#') 346 continue; 347 /* read default domain name */ 348 if (MATCH(buf, "domain")) { 349 if (haveenv) /*%< skip if have from environ */ 350 continue; 351 cp = buf + sizeof("domain") - 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 = strpbrk(statp->defdname, " \t\n")) != NULL) 359 *cp = '\0'; 360 havesearch = 0; 361 continue; 362 } 363 /* set search list */ 364 if (MATCH(buf, "search")) { 365 if (haveenv) /*%< skip if have from environ */ 366 continue; 367 cp = buf + sizeof("search") - 1; 368 while (*cp == ' ' || *cp == '\t') 369 cp++; 370 if ((*cp == '\0') || (*cp == '\n')) 371 continue; 372 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 373 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 374 if ((cp = strchr(statp->defdname, '\n')) != NULL) 375 *cp = '\0'; 376 /* 377 * Set search list to be blank-separated strings 378 * on rest of line. 379 */ 380 cp = statp->defdname; 381 pp = statp->dnsrch; 382 *pp++ = cp; 383 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 384 if (*cp == ' ' || *cp == '\t') { 385 *cp = 0; 386 n = 1; 387 } else if (n) { 388 *pp++ = cp; 389 n = 0; 390 } 391 } 392 /* null terminate last domain if there are excess */ 393 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 394 cp++; 395 *cp = '\0'; 396 *pp++ = 0; 397 havesearch = 1; 398 continue; 399 } 400 /* read nameservers to query */ 401 if (MATCH(buf, "nameserver") && nserv < maxns) { 402 struct addrinfo hints, *ai; 403 char sbuf[NI_MAXSERV]; 404 const size_t minsiz = 405 sizeof(statp->_u._ext.ext->nsaddrs[0]); 406 407 cp = buf + sizeof("nameserver") - 1; 408 while (*cp == ' ' || *cp == '\t') 409 cp++; 410 cp[strcspn(cp, ";# \t\n")] = '\0'; 411 if ((*cp != '\0') && (*cp != '\n')) { 412 memset(&hints, 0, sizeof(hints)); 413 hints.ai_family = PF_UNSPEC; 414 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 415 hints.ai_flags = AI_NUMERICHOST; 416 sprintf(sbuf, "%u", NAMESERVER_PORT); 417 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 418 ai->ai_addrlen <= minsiz) { 419 if (statp->_u._ext.ext != NULL) { 420 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 421 ai->ai_addr, ai->ai_addrlen); 422 } 423 if (ai->ai_addrlen <= 424 sizeof(statp->nsaddr_list[nserv])) { 425 memcpy(&statp->nsaddr_list[nserv], 426 ai->ai_addr, ai->ai_addrlen); 427 } else 428 statp->nsaddr_list[nserv].sin_family = 0; 429 freeaddrinfo(ai); 430 nserv++; 431 } 432 } 433 continue; 434 } 435 #ifdef RESOLVSORT 436 if (MATCH(buf, "sortlist")) { 437 struct in_addr a; 438 struct in6_addr a6; 439 int m, i; 440 u_char *u; 441 struct __res_state_ext *ext = statp->_u._ext.ext; 442 443 cp = buf + sizeof("sortlist") - 1; 444 while (nsort < MAXRESOLVSORT) { 445 while (*cp == ' ' || *cp == '\t') 446 cp++; 447 if (*cp == '\0' || *cp == '\n' || *cp == ';') 448 break; 449 net = cp; 450 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 451 isascii(*cp) && !isspace((unsigned char)*cp)) 452 cp++; 453 n = *cp; 454 *cp = 0; 455 if (inet_aton(net, &a)) { 456 statp->sort_list[nsort].addr = a; 457 if (ISSORTMASK(n)) { 458 *cp++ = n; 459 net = cp; 460 while (*cp && *cp != ';' && 461 isascii(*cp) && 462 !isspace((unsigned char)*cp)) 463 cp++; 464 n = *cp; 465 *cp = 0; 466 if (inet_aton(net, &a)) { 467 statp->sort_list[nsort].mask = a.s_addr; 468 } else { 469 statp->sort_list[nsort].mask = 470 net_mask(statp->sort_list[nsort].addr); 471 } 472 } else { 473 statp->sort_list[nsort].mask = 474 net_mask(statp->sort_list[nsort].addr); 475 } 476 ext->sort_list[nsort].af = AF_INET; 477 ext->sort_list[nsort].addr.ina = 478 statp->sort_list[nsort].addr; 479 ext->sort_list[nsort].mask.ina.s_addr = 480 statp->sort_list[nsort].mask; 481 nsort++; 482 } 483 else if (inet_pton(AF_INET6, net, &a6) == 1) { 484 485 ext->sort_list[nsort].af = AF_INET6; 486 ext->sort_list[nsort].addr.in6a = a6; 487 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 488 *cp++ = n; 489 net = cp; 490 while (*cp && *cp != ';' && 491 isascii(*cp) && !isspace(*cp)) 492 cp++; 493 m = n; 494 n = *cp; 495 *cp = 0; 496 switch (m) { 497 case '/': 498 m = atoi(net); 499 break; 500 case '&': 501 if (inet_pton(AF_INET6, net, u) == 1) { 502 m = -1; 503 break; 504 } 505 /*FALLTHROUGH*/ 506 default: 507 m = sizeof(struct in6_addr) * CHAR_BIT; 508 break; 509 } 510 if (m >= 0) { 511 for (i = 0; i < sizeof(struct in6_addr); i++) { 512 if (m <= 0) { 513 *u = 0; 514 } else { 515 m -= CHAR_BIT; 516 *u = (u_char)~0; 517 if (m < 0) 518 *u <<= -m; 519 } 520 u++; 521 } 522 } 523 statp->sort_list[nsort].addr.s_addr = 524 (u_int32_t)0xffffffff; 525 statp->sort_list[nsort].mask = 526 (u_int32_t)0xffffffff; 527 nsort++; 528 } 529 *cp = n; 530 } 531 continue; 532 } 533 #endif 534 if (MATCH(buf, "options")) { 535 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 536 continue; 537 } 538 } 539 if (nserv > 0) 540 statp->nscount = nserv; 541 #ifdef RESOLVSORT 542 statp->nsort = nsort; 543 #endif 544 (void) fclose(fp); 545 } 546 /* 547 * Last chance to get a nameserver. This should not normally 548 * be necessary 549 */ 550 #ifdef NO_RESOLV_CONF 551 if(nserv == 0) 552 nserv = get_nameservers(statp); 553 #endif 554 555 if (statp->defdname[0] == 0 && 556 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 557 (cp = strchr(buf, '.')) != NULL) 558 strcpy(statp->defdname, cp + 1); 559 560 /* find components of local domain that might be searched */ 561 if (havesearch == 0) { 562 pp = statp->dnsrch; 563 *pp++ = statp->defdname; 564 *pp = NULL; 565 566 dots = 0; 567 for (cp = statp->defdname; *cp; cp++) 568 dots += (*cp == '.'); 569 570 cp = statp->defdname; 571 while (pp < statp->dnsrch + MAXDFLSRCH) { 572 if (dots < LOCALDOMAINPARTS) 573 break; 574 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 575 *pp++ = cp; 576 dots--; 577 } 578 *pp = NULL; 579 #ifdef DEBUG 580 if (statp->options & RES_DEBUG) { 581 printf(";; res_init()... default dnsrch list:\n"); 582 for (pp = statp->dnsrch; *pp; pp++) 583 printf(";;\t%s\n", *pp); 584 printf(";;\t..END..\n"); 585 } 586 #endif 587 } 588 589 if (issetugid()) 590 statp->options |= RES_NOALIASES; 591 else if ((cp = getenv("RES_OPTIONS")) != NULL) 592 res_setoptions(statp, cp, "env"); 593 statp->options |= RES_INIT; 594 return (statp->res_h_errno); 595 } 596 597 static void 598 res_setoptions(res_state statp, const char *options, const char *source) 599 { 600 const char *cp = options; 601 int i; 602 #ifndef _LIBC 603 struct __res_state_ext *ext = statp->_u._ext.ext; 604 #endif 605 606 #ifdef DEBUG 607 if (statp->options & RES_DEBUG) 608 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 609 options, source); 610 #endif 611 while (*cp) { 612 /* skip leading and inner runs of spaces */ 613 while (*cp == ' ' || *cp == '\t') 614 cp++; 615 /* search for and process individual options */ 616 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 617 i = atoi(cp + sizeof("ndots:") - 1); 618 if (i <= RES_MAXNDOTS) 619 statp->ndots = i; 620 else 621 statp->ndots = RES_MAXNDOTS; 622 #ifdef DEBUG 623 if (statp->options & RES_DEBUG) 624 printf(";;\tndots=%d\n", statp->ndots); 625 #endif 626 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 627 i = atoi(cp + sizeof("timeout:") - 1); 628 if (i <= RES_MAXRETRANS) 629 statp->retrans = i; 630 else 631 statp->retrans = RES_MAXRETRANS; 632 #ifdef DEBUG 633 if (statp->options & RES_DEBUG) 634 printf(";;\ttimeout=%d\n", statp->retrans); 635 #endif 636 #ifdef SOLARIS2 637 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 638 /* 639 * For backward compatibility, 'retrans' is 640 * supported as an alias for 'timeout', though 641 * without an imposed maximum. 642 */ 643 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 644 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 645 /* 646 * For backward compatibility, 'retry' is 647 * supported as an alias for 'attempts', though 648 * without an imposed maximum. 649 */ 650 statp->retry = atoi(cp + sizeof("retry:") - 1); 651 #endif /* SOLARIS2 */ 652 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 653 i = atoi(cp + sizeof("attempts:") - 1); 654 if (i <= RES_MAXRETRY) 655 statp->retry = i; 656 else 657 statp->retry = RES_MAXRETRY; 658 #ifdef DEBUG 659 if (statp->options & RES_DEBUG) 660 printf(";;\tattempts=%d\n", statp->retry); 661 #endif 662 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 663 #ifdef DEBUG 664 if (!(statp->options & RES_DEBUG)) { 665 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 666 options, source); 667 statp->options |= RES_DEBUG; 668 } 669 printf(";;\tdebug\n"); 670 #endif 671 } else if (!strncmp(cp, "no_tld_query", 672 sizeof("no_tld_query") - 1) || 673 !strncmp(cp, "no-tld-query", 674 sizeof("no-tld-query") - 1)) { 675 statp->options |= RES_NOTLDQUERY; 676 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 677 statp->options |= RES_USE_INET6; 678 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 679 statp->options |= RES_INSECURE1; 680 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 681 statp->options |= RES_INSECURE2; 682 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 683 statp->options |= RES_ROTATE; 684 } else if (!strncmp(cp, "no-check-names", 685 sizeof("no-check-names") - 1)) { 686 statp->options |= RES_NOCHECKNAME; 687 } else if (!strncmp(cp, "reload-period:", 688 sizeof("reload-period:") - 1)) { 689 statp->reload_period = (u_short) 690 atoi(cp + sizeof("reload-period:") - 1); 691 } 692 #ifdef RES_USE_EDNS0 693 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 694 statp->options |= RES_USE_EDNS0; 695 } 696 #endif 697 #ifndef _LIBC 698 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 699 statp->options |= RES_USE_DNAME; 700 } 701 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 702 if (ext == NULL) 703 goto skip; 704 cp += sizeof("nibble:") - 1; 705 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 706 strncpy(ext->nsuffix, cp, i); 707 ext->nsuffix[i] = '\0'; 708 } 709 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 710 if (ext == NULL) 711 goto skip; 712 cp += sizeof("nibble2:") - 1; 713 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 714 strncpy(ext->nsuffix2, cp, i); 715 ext->nsuffix2[i] = '\0'; 716 } 717 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 718 cp += sizeof("v6revmode:") - 1; 719 /* "nibble" and "bitstring" used to be valid */ 720 if (!strncmp(cp, "single", sizeof("single") - 1)) { 721 statp->options |= RES_NO_NIBBLE2; 722 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 723 statp->options &= 724 ~RES_NO_NIBBLE2; 725 } 726 } 727 #endif 728 else { 729 /* XXX - print a warning here? */ 730 } 731 #ifndef _LIBC 732 skip: 733 #endif 734 /* skip to next run of spaces */ 735 while (*cp && *cp != ' ' && *cp != '\t') 736 cp++; 737 } 738 } 739 740 #ifdef RESOLVSORT 741 /* XXX - should really support CIDR which means explicit masks always. */ 742 static u_int32_t 743 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 744 { 745 u_int32_t i = ntohl(in.s_addr); 746 747 if (IN_CLASSA(i)) 748 return (htonl(IN_CLASSA_NET)); 749 else if (IN_CLASSB(i)) 750 return (htonl(IN_CLASSB_NET)); 751 return (htonl(IN_CLASSC_NET)); 752 } 753 #endif 754 755 static u_char srnd[16]; 756 757 void 758 res_rndinit(res_state statp) 759 { 760 struct timeval now; 761 u_int32_t u32; 762 u_int16_t u16; 763 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 764 765 gettimeofday(&now, NULL); 766 u32 = now.tv_sec; 767 memcpy(rnd, &u32, 4); 768 u32 = now.tv_usec; 769 memcpy(rnd + 4, &u32, 4); 770 u32 += now.tv_sec; 771 memcpy(rnd + 8, &u32, 4); 772 u16 = getpid(); 773 memcpy(rnd + 12, &u16, 2); 774 } 775 776 u_int 777 res_nrandomid(res_state statp) { 778 struct timeval now; 779 u_int16_t u16; 780 MD5_CTX ctx; 781 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 782 783 gettimeofday(&now, NULL); 784 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 785 memcpy(rnd + 14, &u16, 2); 786 #ifndef HAVE_MD5 787 MD5_Init(&ctx); 788 MD5_Update(&ctx, rnd, 16); 789 MD5_Final(rnd, &ctx); 790 #else 791 MD5Init(&ctx); 792 MD5Update(&ctx, rnd, 16); 793 MD5Final(rnd, &ctx); 794 #endif 795 memcpy(&u16, rnd + 14, 2); 796 return ((u_int) u16); 797 } 798 799 /*% 800 * This routine is for closing the socket if a virtual circuit is used and 801 * the program wants to close it. This provides support for endhostent() 802 * which expects to close the socket. 803 * 804 * This routine is not expected to be user visible. 805 */ 806 void 807 res_nclose(res_state statp) { 808 int ns; 809 810 if (statp->_vcsock >= 0) { 811 (void) _close(statp->_vcsock); 812 statp->_vcsock = -1; 813 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 814 } 815 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 816 if (statp->_u._ext.nssocks[ns] != -1) { 817 (void) _close(statp->_u._ext.nssocks[ns]); 818 statp->_u._ext.nssocks[ns] = -1; 819 } 820 } 821 } 822 823 void 824 res_ndestroy(res_state statp) { 825 res_nclose(statp); 826 if (statp->_u._ext.ext != NULL) { 827 free(statp->_u._ext.ext); 828 statp->_u._ext.ext = NULL; 829 } 830 if (statp->_rnd != NULL) { 831 free(statp->_rnd); 832 statp->_rnd = NULL; 833 } 834 statp->options &= ~RES_INIT; 835 } 836 837 #ifndef _LIBC 838 const char * 839 res_get_nibblesuffix(res_state statp) { 840 if (statp->_u._ext.ext) 841 return (statp->_u._ext.ext->nsuffix); 842 return ("ip6.arpa"); 843 } 844 845 const char * 846 res_get_nibblesuffix2(res_state statp) { 847 if (statp->_u._ext.ext) 848 return (statp->_u._ext.ext->nsuffix2); 849 return ("ip6.int"); 850 } 851 #endif 852 853 void 854 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 855 int i, nserv; 856 size_t size; 857 858 /* close open servers */ 859 res_nclose(statp); 860 861 /* cause rtt times to be forgotten */ 862 statp->_u._ext.nscount = 0; 863 864 nserv = 0; 865 for (i = 0; i < cnt && nserv < MAXNS; i++) { 866 switch (set->sin.sin_family) { 867 case AF_INET: 868 size = sizeof(set->sin); 869 if (statp->_u._ext.ext) 870 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 871 &set->sin, size); 872 if (size <= sizeof(statp->nsaddr_list[nserv])) 873 memcpy(&statp->nsaddr_list[nserv], 874 &set->sin, size); 875 else 876 statp->nsaddr_list[nserv].sin_family = 0; 877 nserv++; 878 break; 879 880 #ifdef HAS_INET6_STRUCTS 881 case AF_INET6: 882 size = sizeof(set->sin6); 883 if (statp->_u._ext.ext) 884 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 885 &set->sin6, size); 886 if (size <= sizeof(statp->nsaddr_list[nserv])) 887 memcpy(&statp->nsaddr_list[nserv], 888 &set->sin6, size); 889 else 890 statp->nsaddr_list[nserv].sin_family = 0; 891 nserv++; 892 break; 893 #endif 894 895 default: 896 break; 897 } 898 set++; 899 } 900 statp->nscount = nserv; 901 902 } 903 904 int 905 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 906 int i; 907 size_t size; 908 u_int16_t family; 909 910 for (i = 0; i < statp->nscount && i < cnt; i++) { 911 if (statp->_u._ext.ext) 912 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 913 else 914 family = statp->nsaddr_list[i].sin_family; 915 916 switch (family) { 917 case AF_INET: 918 size = sizeof(set->sin); 919 if (statp->_u._ext.ext) 920 memcpy(&set->sin, 921 &statp->_u._ext.ext->nsaddrs[i], 922 size); 923 else 924 memcpy(&set->sin, &statp->nsaddr_list[i], 925 size); 926 break; 927 928 #ifdef HAS_INET6_STRUCTS 929 case AF_INET6: 930 size = sizeof(set->sin6); 931 if (statp->_u._ext.ext) 932 memcpy(&set->sin6, 933 &statp->_u._ext.ext->nsaddrs[i], 934 size); 935 else 936 memcpy(&set->sin6, &statp->nsaddr_list[i], 937 size); 938 break; 939 #endif 940 941 default: 942 set->sin.sin_family = 0; 943 break; 944 } 945 set++; 946 } 947 return (statp->nscount); 948 } 949 950 /*! \file */ 951