res_init.c revision 1.20
1 /* $NetBSD: res_init.c,v 1.20 2009/04/20 14:42:12 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 1.20 2009/04/20 14:42:12 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/time.h> 90 91 #include <netinet/in.h> 92 #include <arpa/inet.h> 93 #include <arpa/nameser.h> 94 95 #include <ctype.h> 96 #include <stdio.h> 97 #include <stdlib.h> 98 #include <string.h> 99 #include <unistd.h> 100 #include <netdb.h> 101 102 #define HAVE_MD5 103 #include <md5.h> 104 105 #ifndef HAVE_MD5 106 # include "../dst/md5.h" 107 #else 108 # ifdef SOLARIS2 109 # include <sys/md5.h> 110 # endif 111 #endif 112 #ifndef _MD5_H_ 113 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 114 #endif 115 116 #include "port_after.h" 117 118 #if 0 119 #ifdef __weak_alias 120 __weak_alias(res_ninit,_res_ninit) 121 __weak_alias(res_randomid,__res_randomid) 122 __weak_alias(res_nclose,_res_nclose) 123 __weak_alias(res_ndestroy,_res_ndestroy) 124 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix) 125 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2) 126 __weak_alias(res_getservers,__res_getservers) 127 __weak_alias(res_setservers,__res_setservers) 128 #endif 129 #endif 130 131 132 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 133 #include <resolv.h> 134 135 #include "res_private.h" 136 137 #define RESOLVSORT 138 /*% Options. Should all be left alone. */ 139 #ifndef DEBUG 140 #define DEBUG 141 #endif 142 143 #ifdef SOLARIS2 144 #include <sys/systeminfo.h> 145 #endif 146 147 static void res_setoptions __P((res_state, const char *, const char *)); 148 149 #ifdef RESOLVSORT 150 static const char sort_mask[] = "/&"; 151 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 152 static u_int32_t net_mask __P((struct in_addr)); 153 #endif 154 155 #if !defined(isascii) /*%< XXX - could be a function */ 156 # define isascii(c) (!(c & 0200)) 157 #endif 158 159 /* 160 * Resolver state default settings. 161 */ 162 163 /*% 164 * Set up default settings. If the configuration file exist, the values 165 * there will have precedence. Otherwise, the server address is set to 166 * INADDR_ANY and the default domain name comes from the gethostname(). 167 * 168 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 169 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 170 * since it was noted that INADDR_ANY actually meant ``the first interface 171 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 172 * it had to be "up" in order for you to reach your own name server. It 173 * was later decided that since the recommended practice is to always 174 * install local static routes through 127.0.0.1 for all your network 175 * interfaces, that we could solve this problem without a code change. 176 * 177 * The configuration file should always be used, since it is the only way 178 * to specify a default domain. If you are running a server on your local 179 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 180 * in the configuration file. 181 * 182 * Return 0 if completes successfully, -1 on error 183 */ 184 int 185 res_ninit(res_state statp) { 186 extern int __res_vinit(res_state, int); 187 188 return (__res_vinit(statp, 0)); 189 } 190 191 /*% This function has to be reachable by res_data.c but not publically. */ 192 int 193 __res_vinit(res_state statp, int preinit) { 194 register FILE *fp; 195 register char *cp, **pp; 196 register int n; 197 char buf[BUFSIZ]; 198 int nserv = 0; /*%< number of nameserver records read from file */ 199 int haveenv = 0; 200 int havesearch = 0; 201 #ifdef RESOLVSORT 202 int nsort = 0; 203 char *net; 204 #endif 205 int dots; 206 union res_sockaddr_union u[2]; 207 int maxns = MAXNS; 208 209 RES_SET_H_ERRNO(statp, 0); 210 211 if (!preinit) { 212 statp->retrans = RES_TIMEOUT; 213 statp->retry = RES_DFLRETRY; 214 statp->options = RES_DEFAULT; 215 statp->_rnd = malloc(16); 216 res_rndinit(statp); 217 statp->id = res_nrandomid(statp); 218 } 219 220 if ((statp->options & RES_INIT) != 0U) 221 res_ndestroy(statp); 222 223 memset(u, 0, sizeof(u)); 224 #ifdef USELOOPBACK 225 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 226 #else 227 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 228 #endif 229 u[nserv].sin.sin_family = AF_INET; 230 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 231 #ifdef HAVE_SA_LEN 232 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 233 #endif 234 nserv++; 235 #ifdef HAS_INET6_STRUCTS 236 #ifdef USELOOPBACK 237 u[nserv].sin6.sin6_addr = in6addr_loopback; 238 #else 239 u[nserv].sin6.sin6_addr = in6addr_any; 240 #endif 241 u[nserv].sin6.sin6_family = AF_INET6; 242 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 243 #ifdef HAVE_SA_LEN 244 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 245 #endif 246 nserv++; 247 #endif 248 statp->nscount = 0; 249 statp->ndots = 1; 250 statp->pfcode = 0; 251 statp->_vcsock = -1; 252 statp->_flags = 0; 253 statp->qhook = NULL; 254 statp->rhook = NULL; 255 statp->_u._ext.nscount = 0; 256 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 257 if (statp->_u._ext.ext != NULL) { 258 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 259 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 260 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 261 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 262 } else { 263 /* 264 * Historically res_init() rarely, if at all, failed. 265 * Examples and applications exist which do not check 266 * our return code. Furthermore several applications 267 * simply call us to get the systems domainname. So 268 * rather then immediately fail here we store the 269 * failure, which is returned later, in h_errno. And 270 * prevent the collection of 'nameserver' information 271 * by setting maxns to 0. Thus applications that fail 272 * to check our return code wont be able to make 273 * queries anyhow. 274 */ 275 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 276 maxns = 0; 277 } 278 #ifdef RESOLVSORT 279 statp->nsort = 0; 280 #endif 281 res_setservers(statp, u, nserv); 282 283 #ifdef SOLARIS2 284 /* 285 * The old libresolv derived the defaultdomain from NIS/NIS+. 286 * We want to keep this behaviour 287 */ 288 { 289 char buf[sizeof(statp->defdname)], *cp; 290 int ret; 291 292 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 293 (unsigned int)ret <= sizeof(buf)) { 294 if (buf[0] == '+') 295 buf[0] = '.'; 296 cp = strchr(buf, '.'); 297 cp = (cp == NULL) ? buf : (cp + 1); 298 (void)strlcpy(statp->defdname, cp, 299 sizeof(statp->defdname)); 300 } 301 } 302 #endif /* SOLARIS2 */ 303 304 /* Allow user to override the local domain definition */ 305 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 306 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 307 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 308 haveenv++; 309 310 /* 311 * Set search list to be blank-separated strings 312 * from rest of env value. Permits users of LOCALDOMAIN 313 * to still have a search list, and anyone to set the 314 * one that they want to use as an individual (even more 315 * important now that the rfc1535 stuff restricts searches) 316 */ 317 cp = statp->defdname; 318 pp = statp->dnsrch; 319 *pp++ = cp; 320 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 321 if (*cp == '\n') /*%< silly backwards compat */ 322 break; 323 else if (*cp == ' ' || *cp == '\t') { 324 *cp = 0; 325 n = 1; 326 } else if (n) { 327 *pp++ = cp; 328 n = 0; 329 havesearch = 1; 330 } 331 } 332 /* null terminate last domain if there are excess */ 333 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 334 cp++; 335 *cp = '\0'; 336 *pp++ = 0; 337 } 338 339 #define MATCH(line, name) \ 340 (!strncmp(line, name, sizeof(name) - 1) && \ 341 (line[sizeof(name) - 1] == ' ' || \ 342 line[sizeof(name) - 1] == '\t')) 343 344 nserv = 0; 345 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 346 /* read the config file */ 347 while (fgets(buf, sizeof(buf), fp) != NULL) { 348 /* skip comments */ 349 if (*buf == ';' || *buf == '#') 350 continue; 351 /* read default domain name */ 352 if (MATCH(buf, "domain")) { 353 if (haveenv) /*%< skip if have from environ */ 354 continue; 355 cp = buf + sizeof("domain") - 1; 356 while (*cp == ' ' || *cp == '\t') 357 cp++; 358 if ((*cp == '\0') || (*cp == '\n')) 359 continue; 360 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 361 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 362 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 363 *cp = '\0'; 364 havesearch = 0; 365 continue; 366 } 367 /* set search list */ 368 if (MATCH(buf, "search")) { 369 if (haveenv) /*%< skip if have from environ */ 370 continue; 371 cp = buf + sizeof("search") - 1; 372 while (*cp == ' ' || *cp == '\t') 373 cp++; 374 if ((*cp == '\0') || (*cp == '\n')) 375 continue; 376 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 377 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 378 if ((cp = strchr(statp->defdname, '\n')) != NULL) 379 *cp = '\0'; 380 /* 381 * Set search list to be blank-separated strings 382 * on rest of line. 383 */ 384 cp = statp->defdname; 385 pp = statp->dnsrch; 386 *pp++ = cp; 387 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 388 if (*cp == ' ' || *cp == '\t') { 389 *cp = 0; 390 n = 1; 391 } else if (n) { 392 *pp++ = cp; 393 n = 0; 394 } 395 } 396 /* null terminate last domain if there are excess */ 397 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 398 cp++; 399 *cp = '\0'; 400 *pp++ = 0; 401 havesearch = 1; 402 continue; 403 } 404 /* read nameservers to query */ 405 if (MATCH(buf, "nameserver") && nserv < maxns) { 406 struct addrinfo hints, *ai; 407 char sbuf[NI_MAXSERV]; 408 const size_t minsiz = 409 sizeof(statp->_u._ext.ext->nsaddrs[0]); 410 411 cp = buf + sizeof("nameserver") - 1; 412 while (*cp == ' ' || *cp == '\t') 413 cp++; 414 cp[strcspn(cp, ";# \t\n")] = '\0'; 415 if ((*cp != '\0') && (*cp != '\n')) { 416 memset(&hints, 0, sizeof(hints)); 417 hints.ai_family = PF_UNSPEC; 418 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 419 hints.ai_flags = AI_NUMERICHOST; 420 sprintf(sbuf, "%u", NAMESERVER_PORT); 421 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 422 ai->ai_addrlen <= minsiz) { 423 if (statp->_u._ext.ext != NULL) { 424 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 425 ai->ai_addr, ai->ai_addrlen); 426 } 427 if (ai->ai_addrlen <= 428 sizeof(statp->nsaddr_list[nserv])) { 429 memcpy(&statp->nsaddr_list[nserv], 430 ai->ai_addr, ai->ai_addrlen); 431 } else 432 statp->nsaddr_list[nserv].sin_family = 0; 433 freeaddrinfo(ai); 434 nserv++; 435 } 436 } 437 continue; 438 } 439 #ifdef RESOLVSORT 440 if (MATCH(buf, "sortlist")) { 441 struct in_addr a; 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 nsort++; 477 } 478 *cp = n; 479 } 480 continue; 481 } 482 #endif 483 if (MATCH(buf, "options")) { 484 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 485 continue; 486 } 487 } 488 if (nserv > 0) 489 statp->nscount = nserv; 490 #ifdef RESOLVSORT 491 statp->nsort = nsort; 492 #endif 493 (void) fclose(fp); 494 } 495 /* 496 * Last chance to get a nameserver. This should not normally 497 * be necessary 498 */ 499 #ifdef NO_RESOLV_CONF 500 if(nserv == 0) 501 nserv = get_nameservers(statp); 502 #endif 503 504 if (statp->defdname[0] == 0 && 505 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 506 (cp = strchr(buf, '.')) != NULL) 507 strcpy(statp->defdname, cp + 1); 508 509 /* find components of local domain that might be searched */ 510 if (havesearch == 0) { 511 pp = statp->dnsrch; 512 *pp++ = statp->defdname; 513 *pp = NULL; 514 515 dots = 0; 516 for (cp = statp->defdname; *cp; cp++) 517 dots += (*cp == '.'); 518 519 cp = statp->defdname; 520 while (pp < statp->dnsrch + MAXDFLSRCH) { 521 if (dots < LOCALDOMAINPARTS) 522 break; 523 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 524 *pp++ = cp; 525 dots--; 526 } 527 *pp = NULL; 528 #ifdef DEBUG 529 if (statp->options & RES_DEBUG) { 530 printf(";; res_init()... default dnsrch list:\n"); 531 for (pp = statp->dnsrch; *pp; pp++) 532 printf(";;\t%s\n", *pp); 533 printf(";;\t..END..\n"); 534 } 535 #endif 536 } 537 538 if ((cp = getenv("RES_OPTIONS")) != NULL) 539 res_setoptions(statp, cp, "env"); 540 statp->options |= RES_INIT; 541 return (statp->res_h_errno); 542 } 543 544 static void 545 res_setoptions(res_state statp, const char *options, const char *source) 546 { 547 const char *cp = options; 548 int i; 549 struct __res_state_ext *ext = statp->_u._ext.ext; 550 551 #ifdef DEBUG 552 if (statp->options & RES_DEBUG) 553 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 554 options, source); 555 #endif 556 while (*cp) { 557 /* skip leading and inner runs of spaces */ 558 while (*cp == ' ' || *cp == '\t') 559 cp++; 560 /* search for and process individual options */ 561 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 562 i = atoi(cp + sizeof("ndots:") - 1); 563 if (i <= RES_MAXNDOTS) 564 statp->ndots = i; 565 else 566 statp->ndots = RES_MAXNDOTS; 567 #ifdef DEBUG 568 if (statp->options & RES_DEBUG) 569 printf(";;\tndots=%d\n", statp->ndots); 570 #endif 571 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 572 i = atoi(cp + sizeof("timeout:") - 1); 573 if (i <= RES_MAXRETRANS) 574 statp->retrans = i; 575 else 576 statp->retrans = RES_MAXRETRANS; 577 #ifdef DEBUG 578 if (statp->options & RES_DEBUG) 579 printf(";;\ttimeout=%d\n", statp->retrans); 580 #endif 581 #ifdef SOLARIS2 582 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 583 /* 584 * For backward compatibility, 'retrans' is 585 * supported as an alias for 'timeout', though 586 * without an imposed maximum. 587 */ 588 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 589 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 590 /* 591 * For backward compatibility, 'retry' is 592 * supported as an alias for 'attempts', though 593 * without an imposed maximum. 594 */ 595 statp->retry = atoi(cp + sizeof("retry:") - 1); 596 #endif /* SOLARIS2 */ 597 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 598 i = atoi(cp + sizeof("attempts:") - 1); 599 if (i <= RES_MAXRETRY) 600 statp->retry = i; 601 else 602 statp->retry = RES_MAXRETRY; 603 #ifdef DEBUG 604 if (statp->options & RES_DEBUG) 605 printf(";;\tattempts=%d\n", statp->retry); 606 #endif 607 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 608 #ifdef DEBUG 609 if (!(statp->options & RES_DEBUG)) { 610 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 611 options, source); 612 statp->options |= RES_DEBUG; 613 } 614 printf(";;\tdebug\n"); 615 #endif 616 } else if (!strncmp(cp, "no_tld_query", 617 sizeof("no_tld_query") - 1) || 618 !strncmp(cp, "no-tld-query", 619 sizeof("no-tld-query") - 1)) { 620 statp->options |= RES_NOTLDQUERY; 621 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 622 statp->options |= RES_USE_INET6; 623 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 624 statp->options |= RES_ROTATE; 625 } else if (!strncmp(cp, "no-check-names", 626 sizeof("no-check-names") - 1)) { 627 statp->options |= RES_NOCHECKNAME; 628 } 629 #ifdef RES_USE_EDNS0 630 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 631 statp->options |= RES_USE_EDNS0; 632 } 633 #endif 634 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 635 statp->options |= RES_USE_DNAME; 636 } 637 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 638 if (ext == NULL) 639 goto skip; 640 cp += sizeof("nibble:") - 1; 641 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 642 strncpy(ext->nsuffix, cp, (size_t)i); 643 ext->nsuffix[i] = '\0'; 644 } 645 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 646 if (ext == NULL) 647 goto skip; 648 cp += sizeof("nibble2:") - 1; 649 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 650 strncpy(ext->nsuffix2, cp, (size_t)i); 651 ext->nsuffix2[i] = '\0'; 652 } 653 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 654 cp += sizeof("v6revmode:") - 1; 655 /* "nibble" and "bitstring" used to be valid */ 656 if (!strncmp(cp, "single", sizeof("single") - 1)) { 657 statp->options |= RES_NO_NIBBLE2; 658 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 659 statp->options &= 660 ~RES_NO_NIBBLE2; 661 } 662 } 663 else { 664 /* XXX - print a warning here? */ 665 } 666 skip: 667 /* skip to next run of spaces */ 668 while (*cp && *cp != ' ' && *cp != '\t') 669 cp++; 670 } 671 } 672 673 #ifdef RESOLVSORT 674 /* XXX - should really support CIDR which means explicit masks always. */ 675 static u_int32_t 676 net_mask(in) /*!< XXX - should really use system's version of this */ 677 struct in_addr in; 678 { 679 register u_int32_t i = ntohl(in.s_addr); 680 681 if (IN_CLASSA(i)) 682 return (htonl(IN_CLASSA_NET)); 683 else if (IN_CLASSB(i)) 684 return (htonl(IN_CLASSB_NET)); 685 return (htonl(IN_CLASSC_NET)); 686 } 687 #endif 688 689 static u_char srnd[16]; 690 691 void 692 res_rndinit(res_state statp) 693 { 694 struct timeval now; 695 u_int32_t u32; 696 u_int16_t u16; 697 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 698 699 gettimeofday(&now, NULL); 700 u32 = (u_int32_t)now.tv_sec; 701 memcpy(rnd, &u32, 4); 702 u32 = now.tv_usec; 703 memcpy(rnd + 4, &u32, 4); 704 u32 += (u_int32_t)now.tv_sec; 705 memcpy(rnd + 8, &u32, 4); 706 u16 = getpid(); 707 memcpy(rnd + 12, &u16, 2); 708 } 709 710 u_int 711 res_nrandomid(res_state statp) { 712 struct timeval now; 713 u_int16_t u16; 714 MD5_CTX ctx; 715 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 716 717 gettimeofday(&now, NULL); 718 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 719 memcpy(rnd + 14, &u16, 2); 720 #ifndef HAVE_MD5 721 MD5_Init(&ctx); 722 MD5_Update(&ctx, rnd, 16); 723 MD5_Final(rnd, &ctx); 724 #else 725 MD5Init(&ctx); 726 MD5Update(&ctx, rnd, 16); 727 MD5Final(rnd, &ctx); 728 #endif 729 memcpy(&u16, rnd + 14, 2); 730 return ((u_int) u16); 731 } 732 733 /*% 734 * This routine is for closing the socket if a virtual circuit is used and 735 * the program wants to close it. This provides support for endhostent() 736 * which expects to close the socket. 737 * 738 * This routine is not expected to be user visible. 739 */ 740 void 741 res_nclose(res_state statp) { 742 int ns; 743 744 if (statp->_vcsock >= 0) { 745 (void) close(statp->_vcsock); 746 statp->_vcsock = -1; 747 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 748 } 749 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 750 if (statp->_u._ext.nssocks[ns] != -1) { 751 (void) close(statp->_u._ext.nssocks[ns]); 752 statp->_u._ext.nssocks[ns] = -1; 753 } 754 } 755 } 756 757 void 758 res_ndestroy(res_state statp) { 759 res_nclose(statp); 760 if (statp->_u._ext.ext != NULL) { 761 free(statp->_u._ext.ext); 762 statp->_u._ext.ext = NULL; 763 } 764 if (statp->_rnd != NULL) { 765 free(statp->_rnd); 766 statp->_rnd = NULL; 767 } 768 statp->options &= ~RES_INIT; 769 } 770 771 const char * 772 res_get_nibblesuffix(res_state statp) { 773 if (statp->_u._ext.ext) 774 return (statp->_u._ext.ext->nsuffix); 775 return ("ip6.arpa"); 776 } 777 778 const char * 779 res_get_nibblesuffix2(res_state statp) { 780 if (statp->_u._ext.ext) 781 return (statp->_u._ext.ext->nsuffix2); 782 return ("ip6.int"); 783 } 784 785 void 786 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 787 int i, nserv; 788 size_t size; 789 790 /* close open servers */ 791 res_nclose(statp); 792 793 /* cause rtt times to be forgotten */ 794 statp->_u._ext.nscount = 0; 795 796 nserv = 0; 797 for (i = 0; i < cnt && nserv < MAXNS; i++) { 798 switch (set->sin.sin_family) { 799 case AF_INET: 800 size = sizeof(set->sin); 801 if (statp->_u._ext.ext) 802 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 803 &set->sin, size); 804 if (size <= sizeof(statp->nsaddr_list[nserv])) 805 memcpy(&statp->nsaddr_list[nserv], 806 &set->sin, size); 807 else 808 statp->nsaddr_list[nserv].sin_family = 0; 809 nserv++; 810 break; 811 812 #ifdef HAS_INET6_STRUCTS 813 case AF_INET6: 814 size = sizeof(set->sin6); 815 if (statp->_u._ext.ext) 816 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 817 &set->sin6, size); 818 if (size <= sizeof(statp->nsaddr_list[nserv])) 819 memcpy(&statp->nsaddr_list[nserv], 820 &set->sin6, size); 821 else 822 statp->nsaddr_list[nserv].sin_family = 0; 823 nserv++; 824 break; 825 #endif 826 827 default: 828 break; 829 } 830 set++; 831 } 832 statp->nscount = nserv; 833 834 } 835 836 int 837 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 838 int i; 839 size_t size; 840 u_int16_t family; 841 842 for (i = 0; i < statp->nscount && i < cnt; i++) { 843 if (statp->_u._ext.ext) 844 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 845 else 846 family = statp->nsaddr_list[i].sin_family; 847 848 switch (family) { 849 case AF_INET: 850 size = sizeof(set->sin); 851 if (statp->_u._ext.ext) 852 memcpy(&set->sin, 853 &statp->_u._ext.ext->nsaddrs[i], 854 size); 855 else 856 memcpy(&set->sin, &statp->nsaddr_list[i], 857 size); 858 break; 859 860 #ifdef HAS_INET6_STRUCTS 861 case AF_INET6: 862 size = sizeof(set->sin6); 863 if (statp->_u._ext.ext) 864 memcpy(&set->sin6, 865 &statp->_u._ext.ext->nsaddrs[i], 866 size); 867 else 868 memcpy(&set->sin6, &statp->nsaddr_list[i], 869 size); 870 break; 871 #endif 872 873 default: 874 set->sin.sin_family = 0; 875 break; 876 } 877 set++; 878 } 879 return (statp->nscount); 880 } 881 882 /*! \file */ 883
Indexes created Sun Sep 21 20:09:37 GMT 2025