1 /* $NetBSD: res_init.c,v 1.26 2012/09/09 18:04:26 christos Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 */ 55 56 /* 57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 59 * 60 * Permission to use, copy, modify, and distribute this software for any 61 * purpose with or without fee is hereby granted, provided that the above 62 * copyright notice and this permission notice appear in all copies. 63 * 64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #include <sys/cdefs.h> 74 #if defined(LIBC_SCCS) && !defined(lint) 75 #ifdef notdef 76 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 77 static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_init.c,v 1.26 2012/09/09 18:04:26 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 85 #include "namespace.h" 86 #include <sys/types.h> 87 #include <sys/param.h> 88 #include <sys/socket.h> 89 #include <sys/stat.h> 90 #include <sys/time.h> 91 #if !defined(__minix) 92 #include <sys/event.h> 93 #endif /* !defined(__minix) */ 94 95 #include <netinet/in.h> 96 #include <arpa/inet.h> 97 #include <arpa/nameser.h> 98 99 #include <ctype.h> 100 #include <stdio.h> 101 #include <stdlib.h> 102 #include <string.h> 103 #include <unistd.h> 104 #include <fcntl.h> 105 #include <netdb.h> 106 107 #define HAVE_MD5 108 #include <md5.h> 109 110 #ifndef HAVE_MD5 111 # include "../dst/md5.h" 112 #else 113 # ifdef SOLARIS2 114 # include <sys/md5.h> 115 # endif 116 #endif 117 #ifndef _MD5_H_ 118 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 119 #endif 120 121 #include "port_after.h" 122 123 #if 0 124 #ifdef __weak_alias 125 __weak_alias(res_ninit,_res_ninit) 126 __weak_alias(res_randomid,__res_randomid) 127 __weak_alias(res_nclose,_res_nclose) 128 __weak_alias(res_ndestroy,_res_ndestroy) 129 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix) 130 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2) 131 __weak_alias(res_getservers,__res_getservers) 132 __weak_alias(res_setservers,__res_setservers) 133 #endif 134 #endif 135 136 137 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 138 #include <resolv.h> 139 140 #include "res_private.h" 141 142 #define RESOLVSORT 143 /*% Options. Should all be left alone. */ 144 #ifndef DEBUG 145 #define DEBUG 146 #endif 147 148 #ifdef SOLARIS2 149 #include <sys/systeminfo.h> 150 #endif 151 152 static void res_setoptions(res_state, const char *, const char *); 153 154 #ifdef RESOLVSORT 155 static const char sort_mask[] = "/&"; 156 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 157 static uint32_t net_mask(struct in_addr); 158 #endif 159 160 #if !defined(isascii) /*%< XXX - could be a function */ 161 # define isascii(c) (!(c & 0200)) 162 #endif 163 164 static struct timespec __res_conf_time; 165 #if !defined(__minix) 166 static const struct timespec ts = { 0, 0 }; 167 #endif 168 169 /* 170 * Resolver state default settings. 171 */ 172 173 /*% 174 * Set up default settings. If the configuration file exist, the values 175 * there will have precedence. Otherwise, the server address is set to 176 * INADDR_ANY and the default domain name comes from the gethostname(). 177 * 178 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 179 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 180 * since it was noted that INADDR_ANY actually meant ``the first interface 181 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 182 * it had to be "up" in order for you to reach your own name server. It 183 * was later decided that since the recommended practice is to always 184 * install local static routes through 127.0.0.1 for all your network 185 * interfaces, that we could solve this problem without a code change. 186 * 187 * The configuration file should always be used, since it is the only way 188 * to specify a default domain. If you are running a server on your local 189 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 190 * in the configuration file. 191 * 192 * Return 0 if completes successfully, -1 on error 193 */ 194 int 195 res_ninit(res_state statp) { 196 return (__res_vinit(statp, 0)); 197 } 198 199 /*% This function has to be reachable by res_data.c but not publically. */ 200 int 201 __res_vinit(res_state statp, int preinit) { 202 register FILE *fp; 203 register char *cp, **pp; 204 register int n; 205 char buf[BUFSIZ]; 206 int nserv = 0; /*%< number of nameserver records read from file */ 207 int haveenv = 0; 208 int havesearch = 0; 209 #ifdef RESOLVSORT 210 int nsort = 0; 211 char *net; 212 #endif 213 int dots; 214 union res_sockaddr_union u[2]; 215 int maxns = MAXNS; 216 217 RES_SET_H_ERRNO(statp, 0); 218 219 if ((statp->options & RES_INIT) != 0U) 220 res_ndestroy(statp); 221 222 if (!preinit) { 223 statp->retrans = RES_TIMEOUT; 224 statp->retry = RES_DFLRETRY; 225 statp->options = RES_DEFAULT; 226 } 227 statp->_rnd = malloc(16); 228 res_rndinit(statp); 229 statp->id = res_nrandomid(statp); 230 231 memset(u, 0, sizeof(u)); 232 #ifdef USELOOPBACK 233 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 234 #else 235 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 236 #endif 237 u[nserv].sin.sin_family = AF_INET; 238 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 239 #ifdef HAVE_SA_LEN 240 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 241 #endif 242 nserv++; 243 #ifdef HAS_INET6_STRUCTS 244 #ifdef USELOOPBACK 245 u[nserv].sin6.sin6_addr = in6addr_loopback; 246 #else 247 u[nserv].sin6.sin6_addr = in6addr_any; 248 #endif 249 u[nserv].sin6.sin6_family = AF_INET6; 250 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 251 #ifdef HAVE_SA_LEN 252 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 253 #endif 254 nserv++; 255 #endif 256 statp->nscount = 0; 257 statp->ndots = 1; 258 statp->pfcode = 0; 259 statp->_vcsock = -1; 260 statp->_flags = 0; 261 statp->qhook = NULL; 262 statp->rhook = NULL; 263 statp->_u._ext.nscount = 0; 264 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 265 if (statp->_u._ext.ext != NULL) { 266 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 267 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 268 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 269 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 270 } else { 271 /* 272 * Historically res_init() rarely, if at all, failed. 273 * Examples and applications exist which do not check 274 * our return code. Furthermore several applications 275 * simply call us to get the systems domainname. So 276 * rather then immediately fail here we store the 277 * failure, which is returned later, in h_errno. And 278 * prevent the collection of 'nameserver' information 279 * by setting maxns to 0. Thus applications that fail 280 * to check our return code wont be able to make 281 * queries anyhow. 282 */ 283 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 284 maxns = 0; 285 } 286 #ifdef RESOLVSORT 287 statp->nsort = 0; 288 #endif 289 res_setservers(statp, u, nserv); 290 291 #ifdef SOLARIS2 292 /* 293 * The old libresolv derived the defaultdomain from NIS/NIS+. 294 * We want to keep this behaviour 295 */ 296 { 297 char buf[sizeof(statp->defdname)], *cp; 298 int ret; 299 300 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 301 (unsigned int)ret <= sizeof(buf)) { 302 if (buf[0] == '+') 303 buf[0] = '.'; 304 cp = strchr(buf, '.'); 305 cp = (cp == NULL) ? buf : (cp + 1); 306 (void)strlcpy(statp->defdname, cp, 307 sizeof(statp->defdname)); 308 } 309 } 310 #endif /* SOLARIS2 */ 311 312 /* Allow user to override the local domain definition */ 313 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 314 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 315 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 316 haveenv++; 317 318 /* 319 * Set search list to be blank-separated strings 320 * from rest of env value. Permits users of LOCALDOMAIN 321 * to still have a search list, and anyone to set the 322 * one that they want to use as an individual (even more 323 * important now that the rfc1535 stuff restricts searches) 324 */ 325 cp = statp->defdname; 326 pp = statp->dnsrch; 327 *pp++ = cp; 328 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 329 if (*cp == '\n') /*%< silly backwards compat */ 330 break; 331 else if (*cp == ' ' || *cp == '\t') { 332 *cp = 0; 333 n = 1; 334 } else if (n) { 335 *pp++ = cp; 336 n = 0; 337 havesearch = 1; 338 } 339 } 340 /* null terminate last domain if there are excess */ 341 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 342 cp++; 343 *cp = '\0'; 344 *pp++ = 0; 345 } 346 347 #define MATCH(line, name) \ 348 (!strncmp(line, name, sizeof(name) - 1) && \ 349 (line[sizeof(name) - 1] == ' ' || \ 350 line[sizeof(name) - 1] == '\t')) 351 352 nserv = 0; 353 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 354 struct stat st; 355 #if !defined(__minix) 356 struct kevent kc; 357 #endif /* !defined(__minix) */ 358 359 /* read the config file */ 360 while (fgets(buf, (int)sizeof(buf), fp) != NULL) { 361 /* skip comments */ 362 if (*buf == ';' || *buf == '#') 363 continue; 364 /* read default domain name */ 365 if (MATCH(buf, "domain")) { 366 if (haveenv) /*%< skip if have from environ */ 367 continue; 368 cp = buf + sizeof("domain") - 1; 369 while (*cp == ' ' || *cp == '\t') 370 cp++; 371 if ((*cp == '\0') || (*cp == '\n')) 372 continue; 373 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 374 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 375 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 376 *cp = '\0'; 377 havesearch = 0; 378 continue; 379 } 380 /* set search list */ 381 if (MATCH(buf, "search")) { 382 if (haveenv) /*%< skip if have from environ */ 383 continue; 384 cp = buf + sizeof("search") - 1; 385 while (*cp == ' ' || *cp == '\t') 386 cp++; 387 if ((*cp == '\0') || (*cp == '\n')) 388 continue; 389 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 390 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 391 if ((cp = strchr(statp->defdname, '\n')) != NULL) 392 *cp = '\0'; 393 /* 394 * Set search list to be blank-separated strings 395 * on rest of line. 396 */ 397 cp = statp->defdname; 398 pp = statp->dnsrch; 399 *pp++ = cp; 400 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 401 if (*cp == ' ' || *cp == '\t') { 402 *cp = 0; 403 n = 1; 404 } else if (n) { 405 *pp++ = cp; 406 n = 0; 407 } 408 } 409 /* null terminate last domain if there are excess */ 410 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 411 cp++; 412 *cp = '\0'; 413 *pp++ = 0; 414 havesearch = 1; 415 continue; 416 } 417 /* read nameservers to query */ 418 if (MATCH(buf, "nameserver") && nserv < maxns) { 419 struct addrinfo hints, *ai; 420 char sbuf[NI_MAXSERV]; 421 const size_t minsiz = 422 sizeof(statp->_u._ext.ext->nsaddrs[0]); 423 424 cp = buf + sizeof("nameserver") - 1; 425 while (*cp == ' ' || *cp == '\t') 426 cp++; 427 cp[strcspn(cp, ";# \t\n")] = '\0'; 428 if ((*cp != '\0') && (*cp != '\n')) { 429 memset(&hints, 0, sizeof(hints)); 430 hints.ai_family = PF_UNSPEC; 431 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 432 hints.ai_flags = AI_NUMERICHOST; 433 sprintf(sbuf, "%u", NAMESERVER_PORT); 434 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 435 ai->ai_addrlen <= minsiz) { 436 if (statp->_u._ext.ext != NULL) { 437 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 438 ai->ai_addr, ai->ai_addrlen); 439 } 440 if (ai->ai_addrlen <= 441 sizeof(statp->nsaddr_list[nserv])) { 442 memcpy(&statp->nsaddr_list[nserv], 443 ai->ai_addr, ai->ai_addrlen); 444 } else 445 statp->nsaddr_list[nserv].sin_family = 0; 446 freeaddrinfo(ai); 447 nserv++; 448 } 449 } 450 continue; 451 } 452 #ifdef RESOLVSORT 453 if (MATCH(buf, "sortlist")) { 454 struct in_addr a; 455 456 cp = buf + sizeof("sortlist") - 1; 457 while (nsort < MAXRESOLVSORT) { 458 while (*cp == ' ' || *cp == '\t') 459 cp++; 460 if (*cp == '\0' || *cp == '\n' || *cp == ';') 461 break; 462 net = cp; 463 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 464 isascii(*cp) && !isspace((unsigned char)*cp)) 465 cp++; 466 n = *cp; 467 *cp = 0; 468 if (inet_aton(net, &a)) { 469 statp->sort_list[nsort].addr = a; 470 if (ISSORTMASK(n)) { 471 *cp++ = n; 472 net = cp; 473 while (*cp && *cp != ';' && 474 isascii(*cp) && 475 !isspace((unsigned char)*cp)) 476 cp++; 477 n = *cp; 478 *cp = 0; 479 if (inet_aton(net, &a)) { 480 statp->sort_list[nsort].mask = a.s_addr; 481 } else { 482 statp->sort_list[nsort].mask = 483 net_mask(statp->sort_list[nsort].addr); 484 } 485 } else { 486 statp->sort_list[nsort].mask = 487 net_mask(statp->sort_list[nsort].addr); 488 } 489 nsort++; 490 } 491 *cp = n; 492 } 493 continue; 494 } 495 #endif 496 if (MATCH(buf, "options")) { 497 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 498 continue; 499 } 500 } 501 if (nserv > 0) 502 statp->nscount = nserv; 503 #ifdef RESOLVSORT 504 statp->nsort = nsort; 505 #endif 506 statp->_u._ext.ext->resfd = dup(fileno(fp)); 507 (void) fclose(fp); 508 if (fstat(statp->_u._ext.ext->resfd, &st) != -1) 509 __res_conf_time = statp->_u._ext.ext->res_conf_time = 510 st.st_mtimespec; 511 #if !defined(__minix) 512 statp->_u._ext.ext->kq = kqueue1(O_CLOEXEC); 513 EV_SET(&kc, statp->_u._ext.ext->resfd, EVFILT_VNODE, 514 EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND| 515 NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0); 516 (void)kevent(statp->_u._ext.ext->kq, &kc, 1, NULL, 0, &ts); 517 #else 518 statp->_u._ext.ext->kq = -1; 519 #endif /* !defined(__minix) */ 520 } else { 521 statp->_u._ext.ext->kq = -1; 522 statp->_u._ext.ext->resfd = -1; 523 } 524 /* 525 * Last chance to get a nameserver. This should not normally 526 * be necessary 527 */ 528 #ifdef NO_RESOLV_CONF 529 if(nserv == 0) 530 nserv = get_nameservers(statp); 531 #endif 532 533 if (statp->defdname[0] == 0 && 534 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 535 (cp = strchr(buf, '.')) != NULL) 536 strcpy(statp->defdname, cp + 1); 537 538 /* find components of local domain that might be searched */ 539 if (havesearch == 0) { 540 pp = statp->dnsrch; 541 *pp++ = statp->defdname; 542 *pp = NULL; 543 544 dots = 0; 545 for (cp = statp->defdname; *cp; cp++) 546 dots += (*cp == '.'); 547 548 cp = statp->defdname; 549 while (pp < statp->dnsrch + MAXDFLSRCH) { 550 if (dots < LOCALDOMAINPARTS) 551 break; 552 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 553 *pp++ = cp; 554 dots--; 555 } 556 *pp = NULL; 557 #ifdef DEBUG 558 if (statp->options & RES_DEBUG) { 559 printf(";; res_init()... default dnsrch list:\n"); 560 for (pp = statp->dnsrch; *pp; pp++) 561 printf(";;\t%s\n", *pp); 562 printf(";;\t..END..\n"); 563 } 564 #endif 565 } 566 567 if ((cp = getenv("RES_OPTIONS")) != NULL) 568 res_setoptions(statp, cp, "env"); 569 statp->options |= RES_INIT; 570 return (statp->res_h_errno); 571 } 572 573 int 574 res_check(res_state statp, struct timespec *mtime) 575 { 576 #if defined(__minix) 577 /* 578 * XXX: No update on change. 579 */ 580 return 0; 581 #else 582 /* 583 * If the times are equal, then we check if there 584 * was a kevent related to resolv.conf and reload. 585 * If the times are not equal, then we don't bother 586 * to check the kevent, because another thread already 587 * did, loaded and changed the time. 588 */ 589 if (timespeccmp(&statp->_u._ext.ext->res_conf_time, 590 &__res_conf_time, ==)) { 591 struct kevent ke; 592 if (statp->_u._ext.ext->kq == -1) 593 goto out; 594 595 switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) { 596 case 0: 597 case -1: 598 out: 599 if (mtime) 600 *mtime = __res_conf_time; 601 return 0; 602 default: 603 break; 604 } 605 } 606 (void)__res_vinit(statp, 0); 607 if (mtime) 608 *mtime = __res_conf_time; 609 return 1; 610 #endif /* defined(__minix) */ 611 } 612 613 static void 614 res_setoptions(res_state statp, const char *options, const char *source) 615 { 616 const char *cp = options; 617 int i; 618 size_t j; 619 struct __res_state_ext *ext = statp->_u._ext.ext; 620 621 #ifdef DEBUG 622 if (statp->options & RES_DEBUG) 623 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 624 options, source); 625 #endif 626 while (*cp) { 627 /* skip leading and inner runs of spaces */ 628 while (*cp == ' ' || *cp == '\t') 629 cp++; 630 /* search for and process individual options */ 631 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 632 i = atoi(cp + sizeof("ndots:") - 1); 633 if (i <= RES_MAXNDOTS) 634 statp->ndots = i; 635 else 636 statp->ndots = RES_MAXNDOTS; 637 #ifdef DEBUG 638 if (statp->options & RES_DEBUG) 639 printf(";;\tndots=%d\n", statp->ndots); 640 #endif 641 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 642 i = atoi(cp + sizeof("timeout:") - 1); 643 if (i <= RES_MAXRETRANS) 644 statp->retrans = i; 645 else 646 statp->retrans = RES_MAXRETRANS; 647 #ifdef DEBUG 648 if (statp->options & RES_DEBUG) 649 printf(";;\ttimeout=%d\n", statp->retrans); 650 #endif 651 #ifdef SOLARIS2 652 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 653 /* 654 * For backward compatibility, 'retrans' is 655 * supported as an alias for 'timeout', though 656 * without an imposed maximum. 657 */ 658 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 659 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 660 /* 661 * For backward compatibility, 'retry' is 662 * supported as an alias for 'attempts', though 663 * without an imposed maximum. 664 */ 665 statp->retry = atoi(cp + sizeof("retry:") - 1); 666 #endif /* SOLARIS2 */ 667 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 668 i = atoi(cp + sizeof("attempts:") - 1); 669 if (i <= RES_MAXRETRY) 670 statp->retry = i; 671 else 672 statp->retry = RES_MAXRETRY; 673 #ifdef DEBUG 674 if (statp->options & RES_DEBUG) 675 printf(";;\tattempts=%d\n", statp->retry); 676 #endif 677 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 678 #ifdef DEBUG 679 if (!(statp->options & RES_DEBUG)) { 680 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 681 options, source); 682 statp->options |= RES_DEBUG; 683 } 684 printf(";;\tdebug\n"); 685 #endif 686 } else if (!strncmp(cp, "no_tld_query", 687 sizeof("no_tld_query") - 1) || 688 !strncmp(cp, "no-tld-query", 689 sizeof("no-tld-query") - 1)) { 690 statp->options |= RES_NOTLDQUERY; 691 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 692 statp->options |= RES_USE_INET6; 693 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 694 statp->options |= RES_ROTATE; 695 } else if (!strncmp(cp, "no-check-names", 696 sizeof("no-check-names") - 1)) { 697 statp->options |= RES_NOCHECKNAME; 698 } else if (!strncmp(cp, "check-names", 699 sizeof("check-names") - 1)) { 700 statp->options &= ~RES_NOCHECKNAME; 701 } 702 #ifdef RES_USE_EDNS0 703 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 704 statp->options |= RES_USE_EDNS0; 705 } 706 #endif 707 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 708 statp->options |= RES_USE_DNAME; 709 } 710 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 711 if (ext == NULL) 712 goto skip; 713 cp += sizeof("nibble:") - 1; 714 j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 715 strncpy(ext->nsuffix, cp, j); 716 ext->nsuffix[j] = '\0'; 717 } 718 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 719 if (ext == NULL) 720 goto skip; 721 cp += sizeof("nibble2:") - 1; 722 j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 723 strncpy(ext->nsuffix2, cp, j); 724 ext->nsuffix2[j] = '\0'; 725 } 726 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 727 cp += sizeof("v6revmode:") - 1; 728 /* "nibble" and "bitstring" used to be valid */ 729 if (!strncmp(cp, "single", sizeof("single") - 1)) { 730 statp->options |= RES_NO_NIBBLE2; 731 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 732 statp->options &= 733 ~RES_NO_NIBBLE2; 734 } 735 } 736 else { 737 /* XXX - print a warning here? */ 738 } 739 skip: 740 /* skip to next run of spaces */ 741 while (*cp && *cp != ' ' && *cp != '\t') 742 cp++; 743 } 744 } 745 746 #ifdef RESOLVSORT 747 /* XXX - should really support CIDR which means explicit masks always. */ 748 static uint32_t 749 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 750 { 751 register uint32_t i = ntohl(in.s_addr); 752 753 if (IN_CLASSA(i)) 754 return (htonl(IN_CLASSA_NET)); 755 else if (IN_CLASSB(i)) 756 return (htonl(IN_CLASSB_NET)); 757 return (htonl(IN_CLASSC_NET)); 758 } 759 #endif 760 761 static u_char srnd[16]; 762 763 void 764 res_rndinit(res_state statp) 765 { 766 struct timeval now; 767 uint32_t u32; 768 uint16_t u16; 769 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 770 771 gettimeofday(&now, NULL); 772 u32 = (uint32_t)now.tv_sec; 773 memcpy(rnd, &u32, 4); 774 u32 = now.tv_usec; 775 memcpy(rnd + 4, &u32, 4); 776 u32 += (uint32_t)now.tv_sec; 777 memcpy(rnd + 8, &u32, 4); 778 u16 = getpid(); 779 memcpy(rnd + 12, &u16, 2); 780 } 781 782 u_int 783 res_nrandomid(res_state statp) 784 { 785 struct timeval now; 786 uint16_t u16; 787 MD5_CTX ctx; 788 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 789 790 gettimeofday(&now, NULL); 791 u16 = (uint16_t) (now.tv_sec ^ now.tv_usec); 792 memcpy(rnd + 14, &u16, 2); 793 #ifndef HAVE_MD5 794 MD5_Init(&ctx); 795 MD5_Update(&ctx, rnd, 16); 796 MD5_Final(rnd, &ctx); 797 #else 798 MD5Init(&ctx); 799 MD5Update(&ctx, rnd, 16); 800 MD5Final(rnd, &ctx); 801 #endif 802 memcpy(&u16, rnd + 14, 2); 803 return ((u_int) u16); 804 } 805 806 /*% 807 * This routine is for closing the socket if a virtual circuit is used and 808 * the program wants to close it. This provides support for endhostent() 809 * which expects to close the socket. 810 * 811 * This routine is not expected to be user visible. 812 */ 813 void 814 res_nclose(res_state statp) 815 { 816 int ns; 817 818 if (statp->_vcsock >= 0) { 819 (void) close(statp->_vcsock); 820 statp->_vcsock = -1; 821 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 822 } 823 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 824 if (statp->_u._ext.nssocks[ns] != -1) { 825 (void) close(statp->_u._ext.nssocks[ns]); 826 statp->_u._ext.nssocks[ns] = -1; 827 } 828 } 829 } 830 831 void 832 res_ndestroy(res_state statp) 833 { 834 res_nclose(statp); 835 if (statp->_u._ext.ext != NULL) { 836 if (statp->_u._ext.ext->kq != -1) 837 (void)close(statp->_u._ext.ext->kq); 838 if (statp->_u._ext.ext->resfd != -1) 839 (void)close(statp->_u._ext.ext->resfd); 840 free(statp->_u._ext.ext); 841 statp->_u._ext.ext = NULL; 842 } 843 if (statp->_rnd != NULL) { 844 free(statp->_rnd); 845 statp->_rnd = NULL; 846 } 847 statp->options &= ~RES_INIT; 848 } 849 850 const char * 851 res_get_nibblesuffix(res_state statp) 852 { 853 if (statp->_u._ext.ext) 854 return (statp->_u._ext.ext->nsuffix); 855 return ("ip6.arpa"); 856 } 857 858 const char * 859 res_get_nibblesuffix2(res_state statp) 860 { 861 if (statp->_u._ext.ext) 862 return (statp->_u._ext.ext->nsuffix2); 863 return ("ip6.int"); 864 } 865 866 void 867 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) 868 { 869 int i, nserv; 870 size_t size; 871 872 /* close open servers */ 873 res_nclose(statp); 874 875 /* cause rtt times to be forgotten */ 876 statp->_u._ext.nscount = 0; 877 878 nserv = 0; 879 for (i = 0; i < cnt && nserv < MAXNS; i++) { 880 switch (set->sin.sin_family) { 881 case AF_INET: 882 size = sizeof(set->sin); 883 if (statp->_u._ext.ext) 884 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 885 &set->sin, size); 886 if (size <= sizeof(statp->nsaddr_list[nserv])) 887 memcpy(&statp->nsaddr_list[nserv], 888 &set->sin, size); 889 else 890 statp->nsaddr_list[nserv].sin_family = 0; 891 nserv++; 892 break; 893 894 #ifdef HAS_INET6_STRUCTS 895 case AF_INET6: 896 size = sizeof(set->sin6); 897 if (statp->_u._ext.ext) 898 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 899 &set->sin6, size); 900 if (size <= sizeof(statp->nsaddr_list[nserv])) 901 memcpy(&statp->nsaddr_list[nserv], 902 &set->sin6, size); 903 else 904 statp->nsaddr_list[nserv].sin_family = 0; 905 nserv++; 906 break; 907 #endif 908 909 default: 910 break; 911 } 912 set++; 913 } 914 statp->nscount = nserv; 915 916 } 917 918 int 919 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) 920 { 921 int i; 922 size_t size; 923 uint16_t family; 924 925 for (i = 0; i < statp->nscount && i < cnt; i++) { 926 if (statp->_u._ext.ext) 927 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 928 else 929 family = statp->nsaddr_list[i].sin_family; 930 931 switch (family) { 932 case AF_INET: 933 size = sizeof(set->sin); 934 if (statp->_u._ext.ext) 935 memcpy(&set->sin, 936 &statp->_u._ext.ext->nsaddrs[i], 937 size); 938 else 939 memcpy(&set->sin, &statp->nsaddr_list[i], 940 size); 941 break; 942 943 #ifdef HAS_INET6_STRUCTS 944 case AF_INET6: 945 size = sizeof(set->sin6); 946 if (statp->_u._ext.ext) 947 memcpy(&set->sin6, 948 &statp->_u._ext.ext->nsaddrs[i], 949 size); 950 else 951 memcpy(&set->sin6, &statp->nsaddr_list[i], 952 size); 953 break; 954 #endif 955 956 default: 957 set->sin.sin_family = 0; 958 break; 959 } 960 set++; 961 } 962 return (statp->nscount); 963 } 964 965 /*! \file */ 966