1 /* $NetBSD: res_init.c,v 1.22 2009/10/24 17:24:01 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 1.22 2009/10/24 17:24:01 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 #ifndef __minix 92 #include <sys/event.h> 93 #endif /* !__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 __P((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 u_int32_t net_mask __P((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 static const struct timespec ts = { 0, 0 }; 166 167 /* 168 * Resolver state default settings. 169 */ 170 171 /*% 172 * Set up default settings. If the configuration file exist, the values 173 * there will have precedence. Otherwise, the server address is set to 174 * INADDR_ANY and the default domain name comes from the gethostname(). 175 * 176 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 177 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 178 * since it was noted that INADDR_ANY actually meant ``the first interface 179 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 180 * it had to be "up" in order for you to reach your own name server. It 181 * was later decided that since the recommended practice is to always 182 * install local static routes through 127.0.0.1 for all your network 183 * interfaces, that we could solve this problem without a code change. 184 * 185 * The configuration file should always be used, since it is the only way 186 * to specify a default domain. If you are running a server on your local 187 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 188 * in the configuration file. 189 * 190 * Return 0 if completes successfully, -1 on error 191 */ 192 int 193 res_ninit(res_state statp) { 194 return (__res_vinit(statp, 0)); 195 } 196 197 /*% This function has to be reachable by res_data.c but not publically. */ 198 int 199 __res_vinit(res_state statp, int preinit) { 200 register FILE *fp; 201 register char *cp, **pp; 202 register int n; 203 char buf[BUFSIZ]; 204 int nserv = 0; /*%< number of nameserver records read from file */ 205 int haveenv = 0; 206 int havesearch = 0; 207 #ifdef RESOLVSORT 208 int nsort = 0; 209 char *net; 210 #endif 211 int dots; 212 union res_sockaddr_union u[2]; 213 int maxns = MAXNS; 214 215 RES_SET_H_ERRNO(statp, 0); 216 217 if ((statp->options & RES_INIT) != 0U) 218 res_ndestroy(statp); 219 220 if (!preinit) { 221 statp->retrans = RES_TIMEOUT; 222 statp->retry = RES_DFLRETRY; 223 statp->options = RES_DEFAULT; 224 } 225 statp->_rnd = malloc(16); 226 res_rndinit(statp); 227 statp->id = res_nrandomid(statp); 228 229 memset(u, 0, sizeof(u)); 230 #ifdef USELOOPBACK 231 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 232 #else 233 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 234 #endif 235 u[nserv].sin.sin_family = AF_INET; 236 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 237 #ifdef HAVE_SA_LEN 238 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 239 #endif 240 nserv++; 241 #ifdef HAS_INET6_STRUCTS 242 #ifdef USELOOPBACK 243 u[nserv].sin6.sin6_addr = in6addr_loopback; 244 #else 245 u[nserv].sin6.sin6_addr = in6addr_any; 246 #endif 247 u[nserv].sin6.sin6_family = AF_INET6; 248 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 249 #ifdef HAVE_SA_LEN 250 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 251 #endif 252 nserv++; 253 #endif 254 statp->nscount = 0; 255 statp->ndots = 1; 256 statp->pfcode = 0; 257 statp->_vcsock = -1; 258 statp->_flags = 0; 259 statp->qhook = NULL; 260 statp->rhook = NULL; 261 statp->_u._ext.nscount = 0; 262 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 263 if (statp->_u._ext.ext != NULL) { 264 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 265 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 266 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 267 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 268 } else { 269 /* 270 * Historically res_init() rarely, if at all, failed. 271 * Examples and applications exist which do not check 272 * our return code. Furthermore several applications 273 * simply call us to get the systems domainname. So 274 * rather then immediately fail here we store the 275 * failure, which is returned later, in h_errno. And 276 * prevent the collection of 'nameserver' information 277 * by setting maxns to 0. Thus applications that fail 278 * to check our return code wont be able to make 279 * queries anyhow. 280 */ 281 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 282 maxns = 0; 283 } 284 #ifdef RESOLVSORT 285 statp->nsort = 0; 286 #endif 287 res_setservers(statp, u, nserv); 288 289 #ifdef SOLARIS2 290 /* 291 * The old libresolv derived the defaultdomain from NIS/NIS+. 292 * We want to keep this behaviour 293 */ 294 { 295 char buf[sizeof(statp->defdname)], *cp; 296 int ret; 297 298 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 299 (unsigned int)ret <= sizeof(buf)) { 300 if (buf[0] == '+') 301 buf[0] = '.'; 302 cp = strchr(buf, '.'); 303 cp = (cp == NULL) ? buf : (cp + 1); 304 (void)strlcpy(statp->defdname, cp, 305 sizeof(statp->defdname)); 306 } 307 } 308 #endif /* SOLARIS2 */ 309 310 /* Allow user to override the local domain definition */ 311 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 312 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 313 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 314 haveenv++; 315 316 /* 317 * Set search list to be blank-separated strings 318 * from rest of env value. Permits users of LOCALDOMAIN 319 * to still have a search list, and anyone to set the 320 * one that they want to use as an individual (even more 321 * important now that the rfc1535 stuff restricts searches) 322 */ 323 cp = statp->defdname; 324 pp = statp->dnsrch; 325 *pp++ = cp; 326 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 327 if (*cp == '\n') /*%< silly backwards compat */ 328 break; 329 else if (*cp == ' ' || *cp == '\t') { 330 *cp = 0; 331 n = 1; 332 } else if (n) { 333 *pp++ = cp; 334 n = 0; 335 havesearch = 1; 336 } 337 } 338 /* null terminate last domain if there are excess */ 339 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 340 cp++; 341 *cp = '\0'; 342 *pp++ = 0; 343 } 344 345 #define MATCH(line, name) \ 346 (!strncmp(line, name, sizeof(name) - 1) && \ 347 (line[sizeof(name) - 1] == ' ' || \ 348 line[sizeof(name) - 1] == '\t')) 349 350 nserv = 0; 351 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 352 struct stat st; 353 #ifndef __minix 354 struct kevent kc; 355 #endif /* !__minix */ 356 357 /* read the config file */ 358 while (fgets(buf, sizeof(buf), fp) != NULL) { 359 /* skip comments */ 360 if (*buf == ';' || *buf == '#') 361 continue; 362 /* read default domain name */ 363 if (MATCH(buf, "domain")) { 364 if (haveenv) /*%< skip if have from environ */ 365 continue; 366 cp = buf + sizeof("domain") - 1; 367 while (*cp == ' ' || *cp == '\t') 368 cp++; 369 if ((*cp == '\0') || (*cp == '\n')) 370 continue; 371 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 372 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 373 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 374 *cp = '\0'; 375 havesearch = 0; 376 continue; 377 } 378 /* set search list */ 379 if (MATCH(buf, "search")) { 380 if (haveenv) /*%< skip if have from environ */ 381 continue; 382 cp = buf + sizeof("search") - 1; 383 while (*cp == ' ' || *cp == '\t') 384 cp++; 385 if ((*cp == '\0') || (*cp == '\n')) 386 continue; 387 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 388 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 389 if ((cp = strchr(statp->defdname, '\n')) != NULL) 390 *cp = '\0'; 391 /* 392 * Set search list to be blank-separated strings 393 * on rest of line. 394 */ 395 cp = statp->defdname; 396 pp = statp->dnsrch; 397 *pp++ = cp; 398 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 399 if (*cp == ' ' || *cp == '\t') { 400 *cp = 0; 401 n = 1; 402 } else if (n) { 403 *pp++ = cp; 404 n = 0; 405 } 406 } 407 /* null terminate last domain if there are excess */ 408 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 409 cp++; 410 *cp = '\0'; 411 *pp++ = 0; 412 havesearch = 1; 413 continue; 414 } 415 /* read nameservers to query */ 416 if (MATCH(buf, "nameserver") && nserv < maxns) { 417 struct addrinfo hints, *ai; 418 char sbuf[NI_MAXSERV]; 419 const size_t minsiz = 420 sizeof(statp->_u._ext.ext->nsaddrs[0]); 421 422 cp = buf + sizeof("nameserver") - 1; 423 while (*cp == ' ' || *cp == '\t') 424 cp++; 425 cp[strcspn(cp, ";# \t\n")] = '\0'; 426 if ((*cp != '\0') && (*cp != '\n')) { 427 memset(&hints, 0, sizeof(hints)); 428 hints.ai_family = PF_UNSPEC; 429 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 430 hints.ai_flags = AI_NUMERICHOST; 431 sprintf(sbuf, "%u", NAMESERVER_PORT); 432 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 433 ai->ai_addrlen <= minsiz) { 434 if (statp->_u._ext.ext != NULL) { 435 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 436 ai->ai_addr, ai->ai_addrlen); 437 } 438 if (ai->ai_addrlen <= 439 sizeof(statp->nsaddr_list[nserv])) { 440 memcpy(&statp->nsaddr_list[nserv], 441 ai->ai_addr, ai->ai_addrlen); 442 } else 443 statp->nsaddr_list[nserv].sin_family = 0; 444 freeaddrinfo(ai); 445 nserv++; 446 } 447 } 448 continue; 449 } 450 #ifdef RESOLVSORT 451 if (MATCH(buf, "sortlist")) { 452 struct in_addr a; 453 454 cp = buf + sizeof("sortlist") - 1; 455 while (nsort < MAXRESOLVSORT) { 456 while (*cp == ' ' || *cp == '\t') 457 cp++; 458 if (*cp == '\0' || *cp == '\n' || *cp == ';') 459 break; 460 net = cp; 461 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 462 isascii(*cp) && !isspace((unsigned char)*cp)) 463 cp++; 464 n = *cp; 465 *cp = 0; 466 if (inet_aton(net, &a)) { 467 statp->sort_list[nsort].addr = a; 468 if (ISSORTMASK(n)) { 469 *cp++ = n; 470 net = cp; 471 while (*cp && *cp != ';' && 472 isascii(*cp) && 473 !isspace((unsigned char)*cp)) 474 cp++; 475 n = *cp; 476 *cp = 0; 477 if (inet_aton(net, &a)) { 478 statp->sort_list[nsort].mask = a.s_addr; 479 } else { 480 statp->sort_list[nsort].mask = 481 net_mask(statp->sort_list[nsort].addr); 482 } 483 } else { 484 statp->sort_list[nsort].mask = 485 net_mask(statp->sort_list[nsort].addr); 486 } 487 nsort++; 488 } 489 *cp = n; 490 } 491 continue; 492 } 493 #endif 494 if (MATCH(buf, "options")) { 495 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 496 continue; 497 } 498 } 499 if (nserv > 0) 500 statp->nscount = nserv; 501 #ifdef RESOLVSORT 502 statp->nsort = nsort; 503 #endif 504 statp->_u._ext.ext->resfd = dup(fileno(fp)); 505 (void) fclose(fp); 506 if (fstat(statp->_u._ext.ext->resfd, &st) != -1) 507 __res_conf_time = statp->_u._ext.ext->res_conf_time = 508 st.st_mtimespec; 509 #ifndef __minix 510 statp->_u._ext.ext->kq = kqueue(); 511 (void)fcntl(statp->_u._ext.ext->kq, F_SETFD, FD_CLOEXEC); 512 (void)fcntl(statp->_u._ext.ext->resfd, F_SETFD, FD_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 /* __minix */ 518 statp->_u._ext.ext->kq = -1; 519 #endif /* !__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 #ifdef __minix 577 /* 578 * XXX: No update on change. 579 */ 580 return 0; 581 #else /* !__minix */ 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 /* !__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 struct __res_state_ext *ext = statp->_u._ext.ext; 619 620 #ifdef DEBUG 621 if (statp->options & RES_DEBUG) 622 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 623 options, source); 624 #endif 625 while (*cp) { 626 /* skip leading and inner runs of spaces */ 627 while (*cp == ' ' || *cp == '\t') 628 cp++; 629 /* search for and process individual options */ 630 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 631 i = atoi(cp + sizeof("ndots:") - 1); 632 if (i <= RES_MAXNDOTS) 633 statp->ndots = i; 634 else 635 statp->ndots = RES_MAXNDOTS; 636 #ifdef DEBUG 637 if (statp->options & RES_DEBUG) 638 printf(";;\tndots=%d\n", statp->ndots); 639 #endif 640 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 641 i = atoi(cp + sizeof("timeout:") - 1); 642 if (i <= RES_MAXRETRANS) 643 statp->retrans = i; 644 else 645 statp->retrans = RES_MAXRETRANS; 646 #ifdef DEBUG 647 if (statp->options & RES_DEBUG) 648 printf(";;\ttimeout=%d\n", statp->retrans); 649 #endif 650 #ifdef SOLARIS2 651 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 652 /* 653 * For backward compatibility, 'retrans' is 654 * supported as an alias for 'timeout', though 655 * without an imposed maximum. 656 */ 657 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 658 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 659 /* 660 * For backward compatibility, 'retry' is 661 * supported as an alias for 'attempts', though 662 * without an imposed maximum. 663 */ 664 statp->retry = atoi(cp + sizeof("retry:") - 1); 665 #endif /* SOLARIS2 */ 666 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 667 i = atoi(cp + sizeof("attempts:") - 1); 668 if (i <= RES_MAXRETRY) 669 statp->retry = i; 670 else 671 statp->retry = RES_MAXRETRY; 672 #ifdef DEBUG 673 if (statp->options & RES_DEBUG) 674 printf(";;\tattempts=%d\n", statp->retry); 675 #endif 676 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 677 #ifdef DEBUG 678 if (!(statp->options & RES_DEBUG)) { 679 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 680 options, source); 681 statp->options |= RES_DEBUG; 682 } 683 printf(";;\tdebug\n"); 684 #endif 685 } else if (!strncmp(cp, "no_tld_query", 686 sizeof("no_tld_query") - 1) || 687 !strncmp(cp, "no-tld-query", 688 sizeof("no-tld-query") - 1)) { 689 statp->options |= RES_NOTLDQUERY; 690 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 691 statp->options |= RES_USE_INET6; 692 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 693 statp->options |= RES_ROTATE; 694 } else if (!strncmp(cp, "no-check-names", 695 sizeof("no-check-names") - 1)) { 696 statp->options |= RES_NOCHECKNAME; 697 } 698 #ifdef RES_USE_EDNS0 699 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 700 statp->options |= RES_USE_EDNS0; 701 } 702 #endif 703 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 704 statp->options |= RES_USE_DNAME; 705 } 706 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 707 if (ext == NULL) 708 goto skip; 709 cp += sizeof("nibble:") - 1; 710 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 711 strncpy(ext->nsuffix, cp, (size_t)i); 712 ext->nsuffix[i] = '\0'; 713 } 714 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 715 if (ext == NULL) 716 goto skip; 717 cp += sizeof("nibble2:") - 1; 718 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 719 strncpy(ext->nsuffix2, cp, (size_t)i); 720 ext->nsuffix2[i] = '\0'; 721 } 722 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 723 cp += sizeof("v6revmode:") - 1; 724 /* "nibble" and "bitstring" used to be valid */ 725 if (!strncmp(cp, "single", sizeof("single") - 1)) { 726 statp->options |= RES_NO_NIBBLE2; 727 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 728 statp->options &= 729 ~RES_NO_NIBBLE2; 730 } 731 } 732 else { 733 /* XXX - print a warning here? */ 734 } 735 skip: 736 /* skip to next run of spaces */ 737 while (*cp && *cp != ' ' && *cp != '\t') 738 cp++; 739 } 740 } 741 742 #ifdef RESOLVSORT 743 /* XXX - should really support CIDR which means explicit masks always. */ 744 static u_int32_t 745 net_mask(in) /*!< XXX - should really use system's version of this */ 746 struct in_addr in; 747 { 748 register u_int32_t i = ntohl(in.s_addr); 749 750 if (IN_CLASSA(i)) 751 return (htonl(IN_CLASSA_NET)); 752 else if (IN_CLASSB(i)) 753 return (htonl(IN_CLASSB_NET)); 754 return (htonl(IN_CLASSC_NET)); 755 } 756 #endif 757 758 static u_char srnd[16]; 759 760 void 761 res_rndinit(res_state statp) 762 { 763 struct timeval now; 764 u_int32_t u32; 765 u_int16_t u16; 766 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 767 768 gettimeofday(&now, NULL); 769 u32 = (u_int32_t)now.tv_sec; 770 memcpy(rnd, &u32, 4); 771 u32 = now.tv_usec; 772 memcpy(rnd + 4, &u32, 4); 773 u32 += (u_int32_t)now.tv_sec; 774 memcpy(rnd + 8, &u32, 4); 775 u16 = getpid(); 776 memcpy(rnd + 12, &u16, 2); 777 } 778 779 u_int 780 res_nrandomid(res_state statp) { 781 struct timeval now; 782 u_int16_t u16; 783 MD5_CTX ctx; 784 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 785 786 gettimeofday(&now, NULL); 787 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 788 memcpy(rnd + 14, &u16, 2); 789 #ifndef HAVE_MD5 790 MD5_Init(&ctx); 791 MD5_Update(&ctx, rnd, 16); 792 MD5_Final(rnd, &ctx); 793 #else 794 MD5Init(&ctx); 795 MD5Update(&ctx, rnd, 16); 796 MD5Final(rnd, &ctx); 797 #endif 798 memcpy(&u16, rnd + 14, 2); 799 return ((u_int) u16); 800 } 801 802 /*% 803 * This routine is for closing the socket if a virtual circuit is used and 804 * the program wants to close it. This provides support for endhostent() 805 * which expects to close the socket. 806 * 807 * This routine is not expected to be user visible. 808 */ 809 void 810 res_nclose(res_state statp) { 811 int ns; 812 813 if (statp->_vcsock >= 0) { 814 (void) close(statp->_vcsock); 815 statp->_vcsock = -1; 816 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 817 } 818 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 819 if (statp->_u._ext.nssocks[ns] != -1) { 820 (void) close(statp->_u._ext.nssocks[ns]); 821 statp->_u._ext.nssocks[ns] = -1; 822 } 823 } 824 } 825 826 void 827 res_ndestroy(res_state statp) { 828 res_nclose(statp); 829 if (statp->_u._ext.ext != NULL) { 830 if (statp->_u._ext.ext->kq != -1) 831 (void)close(statp->_u._ext.ext->kq); 832 if (statp->_u._ext.ext->resfd != -1) 833 (void)close(statp->_u._ext.ext->resfd); 834 free(statp->_u._ext.ext); 835 statp->_u._ext.ext = NULL; 836 } 837 if (statp->_rnd != NULL) { 838 free(statp->_rnd); 839 statp->_rnd = NULL; 840 } 841 statp->options &= ~RES_INIT; 842 } 843 844 const char * 845 res_get_nibblesuffix(res_state statp) { 846 if (statp->_u._ext.ext) 847 return (statp->_u._ext.ext->nsuffix); 848 return ("ip6.arpa"); 849 } 850 851 const char * 852 res_get_nibblesuffix2(res_state statp) { 853 if (statp->_u._ext.ext) 854 return (statp->_u._ext.ext->nsuffix2); 855 return ("ip6.int"); 856 } 857 858 void 859 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 860 int i, nserv; 861 size_t size; 862 863 /* close open servers */ 864 res_nclose(statp); 865 866 /* cause rtt times to be forgotten */ 867 statp->_u._ext.nscount = 0; 868 869 nserv = 0; 870 for (i = 0; i < cnt && nserv < MAXNS; i++) { 871 switch (set->sin.sin_family) { 872 case AF_INET: 873 size = sizeof(set->sin); 874 if (statp->_u._ext.ext) 875 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 876 &set->sin, size); 877 if (size <= sizeof(statp->nsaddr_list[nserv])) 878 memcpy(&statp->nsaddr_list[nserv], 879 &set->sin, size); 880 else 881 statp->nsaddr_list[nserv].sin_family = 0; 882 nserv++; 883 break; 884 885 #ifdef HAS_INET6_STRUCTS 886 case AF_INET6: 887 size = sizeof(set->sin6); 888 if (statp->_u._ext.ext) 889 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 890 &set->sin6, size); 891 if (size <= sizeof(statp->nsaddr_list[nserv])) 892 memcpy(&statp->nsaddr_list[nserv], 893 &set->sin6, size); 894 else 895 statp->nsaddr_list[nserv].sin_family = 0; 896 nserv++; 897 break; 898 #endif 899 900 default: 901 break; 902 } 903 set++; 904 } 905 statp->nscount = nserv; 906 907 } 908 909 int 910 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 911 int i; 912 size_t size; 913 u_int16_t family; 914 915 for (i = 0; i < statp->nscount && i < cnt; i++) { 916 if (statp->_u._ext.ext) 917 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 918 else 919 family = statp->nsaddr_list[i].sin_family; 920 921 switch (family) { 922 case AF_INET: 923 size = sizeof(set->sin); 924 if (statp->_u._ext.ext) 925 memcpy(&set->sin, 926 &statp->_u._ext.ext->nsaddrs[i], 927 size); 928 else 929 memcpy(&set->sin, &statp->nsaddr_list[i], 930 size); 931 break; 932 933 #ifdef HAS_INET6_STRUCTS 934 case AF_INET6: 935 size = sizeof(set->sin6); 936 if (statp->_u._ext.ext) 937 memcpy(&set->sin6, 938 &statp->_u._ext.ext->nsaddrs[i], 939 size); 940 else 941 memcpy(&set->sin6, &statp->nsaddr_list[i], 942 size); 943 break; 944 #endif 945 946 default: 947 set->sin.sin_family = 0; 948 break; 949 } 950 set++; 951 } 952 return (statp->nscount); 953 } 954 955 /*! \file */ 956