res_init.c revision 1.29
1 /* $NetBSD: res_init.c,v 1.29 2014/09/16 01:29:48 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 1.29 2014/09/16 01:29:48 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 #include <sys/event.h> 92 93 #include <netinet/in.h> 94 #include <arpa/inet.h> 95 #include <arpa/nameser.h> 96 97 #include <ctype.h> 98 #include <stdio.h> 99 #include <stdlib.h> 100 #include <string.h> 101 #include <unistd.h> 102 #include <fcntl.h> 103 #include <netdb.h> 104 105 #define HAVE_MD5 106 #include <md5.h> 107 108 #ifndef HAVE_MD5 109 # include "../dst/md5.h" 110 #else 111 # ifdef SOLARIS2 112 # include <sys/md5.h> 113 # endif 114 #endif 115 #ifndef _MD5_H_ 116 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 117 #endif 118 119 #include "port_after.h" 120 121 #if 0 122 #ifdef __weak_alias 123 __weak_alias(res_ninit,_res_ninit) 124 __weak_alias(res_randomid,__res_randomid) 125 __weak_alias(res_nclose,_res_nclose) 126 __weak_alias(res_ndestroy,_res_ndestroy) 127 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix) 128 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2) 129 __weak_alias(res_getservers,__res_getservers) 130 __weak_alias(res_setservers,__res_setservers) 131 #endif 132 #endif 133 134 135 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 136 #include <resolv.h> 137 138 #include "res_private.h" 139 140 #define RESOLVSORT 141 /*% Options. Should all be left alone. */ 142 #ifndef DEBUG 143 #define DEBUG 144 #endif 145 146 #ifdef SOLARIS2 147 #include <sys/systeminfo.h> 148 #endif 149 150 static void res_setoptions(res_state, const char *, const char *); 151 152 #ifdef RESOLVSORT 153 static const char sort_mask[] = "/&"; 154 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 155 static uint32_t net_mask(struct in_addr); 156 #endif 157 158 #if !defined(isascii) /*%< XXX - could be a function */ 159 # define isascii(c) (!(c & 0200)) 160 #endif 161 162 static struct timespec __res_conf_time; 163 static const struct timespec ts = { 0, 0 }; 164 165 const char *__res_conf_name = _PATH_RESCONF; 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 than 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(__res_conf_name, "re")) != NULL) { 352 struct stat st; 353 struct kevent kc; 354 355 /* read the config file */ 356 while (fgets(buf, (int)sizeof(buf), fp) != NULL) { 357 /* skip comments */ 358 if (*buf == ';' || *buf == '#') 359 continue; 360 /* read default domain name */ 361 if (MATCH(buf, "domain")) { 362 if (haveenv) /*%< skip if have from environ */ 363 continue; 364 cp = buf + sizeof("domain") - 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 = strpbrk(statp->defdname, " \t\n")) != NULL) 372 *cp = '\0'; 373 havesearch = 0; 374 continue; 375 } 376 /* set search list */ 377 if (MATCH(buf, "search")) { 378 if (haveenv) /*%< skip if have from environ */ 379 continue; 380 cp = buf + sizeof("search") - 1; 381 while (*cp == ' ' || *cp == '\t') 382 cp++; 383 if ((*cp == '\0') || (*cp == '\n')) 384 continue; 385 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 386 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 387 if ((cp = strchr(statp->defdname, '\n')) != NULL) 388 *cp = '\0'; 389 /* 390 * Set search list to be blank-separated strings 391 * on rest of line. 392 */ 393 cp = statp->defdname; 394 pp = statp->dnsrch; 395 *pp++ = cp; 396 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 397 if (*cp == ' ' || *cp == '\t') { 398 *cp = 0; 399 n = 1; 400 } else if (n) { 401 *pp++ = cp; 402 n = 0; 403 } 404 } 405 /* null terminate last domain if there are excess */ 406 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 407 cp++; 408 *cp = '\0'; 409 *pp++ = 0; 410 havesearch = 1; 411 continue; 412 } 413 /* read nameservers to query */ 414 if (MATCH(buf, "nameserver") && nserv < maxns) { 415 struct addrinfo hints, *ai; 416 char sbuf[NI_MAXSERV]; 417 const size_t minsiz = 418 sizeof(statp->_u._ext.ext->nsaddrs[0]); 419 420 cp = buf + sizeof("nameserver") - 1; 421 while (*cp == ' ' || *cp == '\t') 422 cp++; 423 cp[strcspn(cp, ";# \t\n")] = '\0'; 424 if ((*cp != '\0') && (*cp != '\n')) { 425 memset(&hints, 0, sizeof(hints)); 426 hints.ai_family = PF_UNSPEC; 427 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 428 hints.ai_flags = AI_NUMERICHOST; 429 sprintf(sbuf, "%u", NAMESERVER_PORT); 430 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 431 ai->ai_addrlen <= minsiz) { 432 if (statp->_u._ext.ext != NULL) { 433 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 434 ai->ai_addr, ai->ai_addrlen); 435 } 436 if (ai->ai_addrlen <= 437 sizeof(statp->nsaddr_list[nserv])) { 438 memcpy(&statp->nsaddr_list[nserv], 439 ai->ai_addr, ai->ai_addrlen); 440 } else 441 statp->nsaddr_list[nserv].sin_family = 0; 442 freeaddrinfo(ai); 443 nserv++; 444 } 445 } 446 continue; 447 } 448 #ifdef RESOLVSORT 449 if (MATCH(buf, "sortlist")) { 450 struct in_addr a; 451 452 cp = buf + sizeof("sortlist") - 1; 453 while (nsort < MAXRESOLVSORT) { 454 while (*cp == ' ' || *cp == '\t') 455 cp++; 456 if (*cp == '\0' || *cp == '\n' || *cp == ';') 457 break; 458 net = cp; 459 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 460 isascii(*cp) && !isspace((unsigned char)*cp)) 461 cp++; 462 n = *cp; 463 *cp = 0; 464 if (inet_aton(net, &a)) { 465 statp->sort_list[nsort].addr = a; 466 if (ISSORTMASK(n)) { 467 *cp++ = n; 468 net = cp; 469 while (*cp && *cp != ';' && 470 isascii(*cp) && 471 !isspace((unsigned char)*cp)) 472 cp++; 473 n = *cp; 474 *cp = 0; 475 if (inet_aton(net, &a)) { 476 statp->sort_list[nsort].mask = a.s_addr; 477 } else { 478 statp->sort_list[nsort].mask = 479 net_mask(statp->sort_list[nsort].addr); 480 } 481 } else { 482 statp->sort_list[nsort].mask = 483 net_mask(statp->sort_list[nsort].addr); 484 } 485 nsort++; 486 } 487 *cp = n; 488 } 489 continue; 490 } 491 #endif 492 if (MATCH(buf, "options")) { 493 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 494 continue; 495 } 496 } 497 if (nserv > 0) 498 statp->nscount = nserv; 499 #ifdef RESOLVSORT 500 statp->nsort = nsort; 501 #endif 502 statp->_u._ext.ext->resfd = fcntl(fileno(fp), F_DUPFD_CLOEXEC); 503 (void) fclose(fp); 504 if (fstat(statp->_u._ext.ext->resfd, &st) != -1) 505 __res_conf_time = statp->_u._ext.ext->res_conf_time = 506 st.st_mtimespec; 507 statp->_u._ext.ext->kq = kqueue1(O_CLOEXEC); 508 EV_SET(&kc, statp->_u._ext.ext->resfd, EVFILT_VNODE, 509 EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND| 510 NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0); 511 (void)kevent(statp->_u._ext.ext->kq, &kc, 1, NULL, 0, &ts); 512 } else { 513 statp->_u._ext.ext->kq = -1; 514 statp->_u._ext.ext->resfd = -1; 515 } 516 /* 517 * Last chance to get a nameserver. This should not normally 518 * be necessary 519 */ 520 #ifdef NO_RESOLV_CONF 521 if(nserv == 0) 522 nserv = get_nameservers(statp); 523 #endif 524 525 if (statp->defdname[0] == 0 && 526 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 527 (cp = strchr(buf, '.')) != NULL) 528 strcpy(statp->defdname, cp + 1); 529 530 /* find components of local domain that might be searched */ 531 if (havesearch == 0) { 532 pp = statp->dnsrch; 533 *pp++ = statp->defdname; 534 *pp = NULL; 535 536 dots = 0; 537 for (cp = statp->defdname; *cp; cp++) 538 dots += (*cp == '.'); 539 540 cp = statp->defdname; 541 while (pp < statp->dnsrch + MAXDFLSRCH) { 542 if (dots < LOCALDOMAINPARTS) 543 break; 544 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 545 *pp++ = cp; 546 dots--; 547 } 548 *pp = NULL; 549 #ifdef DEBUG 550 if (statp->options & RES_DEBUG) { 551 printf(";; res_init()... default dnsrch list:\n"); 552 for (pp = statp->dnsrch; *pp; pp++) 553 printf(";;\t%s\n", *pp); 554 printf(";;\t..END..\n"); 555 } 556 #endif 557 } 558 559 if ((cp = getenv("RES_OPTIONS")) != NULL) 560 res_setoptions(statp, cp, "env"); 561 statp->options |= RES_INIT; 562 return (statp->res_h_errno); 563 } 564 565 int 566 res_check(res_state statp, struct timespec *mtime) 567 { 568 /* 569 * If the times are equal, then we check if there 570 * was a kevent related to resolv.conf and reload. 571 * If the times are not equal, then we don't bother 572 * to check the kevent, because another thread already 573 * did, loaded and changed the time. 574 */ 575 if (timespeccmp(&statp->_u._ext.ext->res_conf_time, 576 &__res_conf_time, ==)) { 577 struct kevent ke; 578 if (statp->_u._ext.ext->kq == -1) 579 goto out; 580 581 switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) { 582 case 0: 583 case -1: 584 out: 585 if (mtime) 586 *mtime = __res_conf_time; 587 return 0; 588 default: 589 break; 590 } 591 } 592 (void)__res_vinit(statp, 0); 593 if (mtime) 594 *mtime = __res_conf_time; 595 return 1; 596 } 597 598 static void 599 res_setoptions(res_state statp, const char *options, const char *source) 600 { 601 const char *cp = options; 602 int i; 603 size_t j; 604 struct __res_state_ext *ext = statp->_u._ext.ext; 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, "rotate", sizeof("rotate") - 1)) { 679 statp->options |= RES_ROTATE; 680 } else if (!strncmp(cp, "no-check-names", 681 sizeof("no-check-names") - 1)) { 682 statp->options |= RES_NOCHECKNAME; 683 } else if (!strncmp(cp, "check-names", 684 sizeof("check-names") - 1)) { 685 statp->options &= ~RES_NOCHECKNAME; 686 } 687 #ifdef RES_USE_EDNS0 688 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 689 statp->options |= RES_USE_EDNS0; 690 } 691 #endif 692 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 693 statp->options |= RES_USE_DNAME; 694 } 695 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 696 if (ext == NULL) 697 goto skip; 698 cp += sizeof("nibble:") - 1; 699 j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 700 strncpy(ext->nsuffix, cp, j); 701 ext->nsuffix[j] = '\0'; 702 } 703 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 704 if (ext == NULL) 705 goto skip; 706 cp += sizeof("nibble2:") - 1; 707 j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 708 strncpy(ext->nsuffix2, cp, j); 709 ext->nsuffix2[j] = '\0'; 710 } 711 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 712 cp += sizeof("v6revmode:") - 1; 713 /* "nibble" and "bitstring" used to be valid */ 714 if (!strncmp(cp, "single", sizeof("single") - 1)) { 715 statp->options |= RES_NO_NIBBLE2; 716 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 717 statp->options &= 718 ~RES_NO_NIBBLE2; 719 } 720 } 721 else { 722 /* XXX - print a warning here? */ 723 } 724 skip: 725 /* skip to next run of spaces */ 726 while (*cp && *cp != ' ' && *cp != '\t') 727 cp++; 728 } 729 } 730 731 #ifdef RESOLVSORT 732 /* XXX - should really support CIDR which means explicit masks always. */ 733 static uint32_t 734 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 735 { 736 register uint32_t i = ntohl(in.s_addr); 737 738 if (IN_CLASSA(i)) 739 return (htonl(IN_CLASSA_NET)); 740 else if (IN_CLASSB(i)) 741 return (htonl(IN_CLASSB_NET)); 742 return (htonl(IN_CLASSC_NET)); 743 } 744 #endif 745 746 static u_char srnd[16]; 747 748 void 749 res_rndinit(res_state statp) 750 { 751 struct timeval now; 752 uint32_t u32; 753 uint16_t u16; 754 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 755 756 gettimeofday(&now, NULL); 757 u32 = (uint32_t)now.tv_sec; 758 memcpy(rnd, &u32, 4); 759 u32 = now.tv_usec; 760 memcpy(rnd + 4, &u32, 4); 761 u32 += (uint32_t)now.tv_sec; 762 memcpy(rnd + 8, &u32, 4); 763 u16 = getpid(); 764 memcpy(rnd + 12, &u16, 2); 765 } 766 767 u_int 768 res_nrandomid(res_state statp) 769 { 770 struct timeval now; 771 uint16_t u16; 772 MD5_CTX ctx; 773 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 774 775 gettimeofday(&now, NULL); 776 u16 = (uint16_t) (now.tv_sec ^ now.tv_usec); 777 memcpy(rnd + 14, &u16, 2); 778 #ifndef HAVE_MD5 779 MD5_Init(&ctx); 780 MD5_Update(&ctx, rnd, 16); 781 MD5_Final(rnd, &ctx); 782 #else 783 MD5Init(&ctx); 784 MD5Update(&ctx, rnd, 16); 785 MD5Final(rnd, &ctx); 786 #endif 787 memcpy(&u16, rnd + 14, 2); 788 return ((u_int) u16); 789 } 790 791 /*% 792 * This routine is for closing the socket if a virtual circuit is used and 793 * the program wants to close it. This provides support for endhostent() 794 * which expects to close the socket. 795 * 796 * This routine is not expected to be user visible. 797 */ 798 void 799 res_nclose(res_state statp) 800 { 801 int ns; 802 803 if (statp->_vcsock >= 0) { 804 (void) close(statp->_vcsock); 805 statp->_vcsock = -1; 806 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 807 } 808 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 809 if (statp->_u._ext.nssocks[ns] != -1) { 810 (void) close(statp->_u._ext.nssocks[ns]); 811 statp->_u._ext.nssocks[ns] = -1; 812 } 813 } 814 } 815 816 void 817 res_ndestroy(res_state statp) 818 { 819 res_nclose(statp); 820 if (statp->_u._ext.ext != NULL) { 821 if (statp->_u._ext.ext->kq != -1) 822 (void)close(statp->_u._ext.ext->kq); 823 if (statp->_u._ext.ext->resfd != -1) 824 (void)close(statp->_u._ext.ext->resfd); 825 free(statp->_u._ext.ext); 826 statp->_u._ext.ext = NULL; 827 } 828 if (statp->_rnd != NULL) { 829 free(statp->_rnd); 830 statp->_rnd = NULL; 831 } 832 statp->options &= ~RES_INIT; 833 } 834 835 const char * 836 res_get_nibblesuffix(res_state statp) 837 { 838 if (statp->_u._ext.ext) 839 return (statp->_u._ext.ext->nsuffix); 840 return ("ip6.arpa"); 841 } 842 843 const char * 844 res_get_nibblesuffix2(res_state statp) 845 { 846 if (statp->_u._ext.ext) 847 return (statp->_u._ext.ext->nsuffix2); 848 return ("ip6.int"); 849 } 850 851 void 852 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) 853 { 854 int i, nserv; 855 size_t size; 856 857 /* close open servers */ 858 res_nclose(statp); 859 860 /* cause rtt times to be forgotten */ 861 statp->_u._ext.nscount = 0; 862 863 nserv = 0; 864 for (i = 0; i < cnt && nserv < MAXNS; i++) { 865 switch (set->sin.sin_family) { 866 case AF_INET: 867 size = sizeof(set->sin); 868 if (statp->_u._ext.ext) 869 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 870 &set->sin, size); 871 if (size <= sizeof(statp->nsaddr_list[nserv])) 872 memcpy(&statp->nsaddr_list[nserv], 873 &set->sin, size); 874 else 875 statp->nsaddr_list[nserv].sin_family = 0; 876 nserv++; 877 break; 878 879 #ifdef HAS_INET6_STRUCTS 880 case AF_INET6: 881 size = sizeof(set->sin6); 882 if (statp->_u._ext.ext) 883 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 884 &set->sin6, size); 885 if (size <= sizeof(statp->nsaddr_list[nserv])) 886 memcpy(&statp->nsaddr_list[nserv], 887 &set->sin6, size); 888 else 889 statp->nsaddr_list[nserv].sin_family = 0; 890 nserv++; 891 break; 892 #endif 893 894 default: 895 break; 896 } 897 set++; 898 } 899 statp->nscount = nserv; 900 901 } 902 903 int 904 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) 905 { 906 int i; 907 size_t size; 908 uint16_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
Indexes created Sun Sep 21 15:09:59 GMT 2025