res_init.c revision 1.17
1 /* $NetBSD: res_init.c,v 1.17 2009/04/12 17:07:17 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 1.17 2009/04/12 17:07:17 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 if (statp->_u._ext.ext != NULL) 211 res_ndestroy(statp); 212 213 if (!preinit) { 214 statp->retrans = RES_TIMEOUT; 215 statp->retry = RES_DFLRETRY; 216 statp->options = RES_DEFAULT; 217 res_rndinit(statp); 218 statp->id = res_nrandomid(statp); 219 } 220 221 if ((statp->options & RES_INIT) != 0U) 222 res_ndestroy(statp); 223 224 memset(u, 0, sizeof(u)); 225 #ifdef USELOOPBACK 226 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 227 #else 228 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 229 #endif 230 u[nserv].sin.sin_family = AF_INET; 231 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 232 #ifdef HAVE_SA_LEN 233 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 234 #endif 235 nserv++; 236 #ifdef HAS_INET6_STRUCTS 237 #ifdef USELOOPBACK 238 u[nserv].sin6.sin6_addr = in6addr_loopback; 239 #else 240 u[nserv].sin6.sin6_addr = in6addr_any; 241 #endif 242 u[nserv].sin6.sin6_family = AF_INET6; 243 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 244 #ifdef HAVE_SA_LEN 245 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 246 #endif 247 nserv++; 248 #endif 249 statp->nscount = 0; 250 statp->ndots = 1; 251 statp->pfcode = 0; 252 statp->_vcsock = -1; 253 statp->_flags = 0; 254 statp->qhook = NULL; 255 statp->rhook = NULL; 256 statp->_u._ext.nscount = 0; 257 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 258 if (statp->_u._ext.ext != NULL) { 259 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 260 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 261 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 262 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 263 } else { 264 /* 265 * Historically res_init() rarely, if at all, failed. 266 * Examples and applications exist which do not check 267 * our return code. Furthermore several applications 268 * simply call us to get the systems domainname. So 269 * rather then immediately fail here we store the 270 * failure, which is returned later, in h_errno. And 271 * prevent the collection of 'nameserver' information 272 * by setting maxns to 0. Thus applications that fail 273 * to check our return code wont be able to make 274 * queries anyhow. 275 */ 276 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 277 maxns = 0; 278 } 279 #ifdef RESOLVSORT 280 statp->nsort = 0; 281 #endif 282 res_setservers(statp, u, nserv); 283 284 #ifdef SOLARIS2 285 /* 286 * The old libresolv derived the defaultdomain from NIS/NIS+. 287 * We want to keep this behaviour 288 */ 289 { 290 char buf[sizeof(statp->defdname)], *cp; 291 int ret; 292 293 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 294 (unsigned int)ret <= sizeof(buf)) { 295 if (buf[0] == '+') 296 buf[0] = '.'; 297 cp = strchr(buf, '.'); 298 cp = (cp == NULL) ? buf : (cp + 1); 299 (void)strlcpy(statp->defdname, cp, 300 sizeof(statp->defdname)); 301 } 302 } 303 #endif /* SOLARIS2 */ 304 305 /* Allow user to override the local domain definition */ 306 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 307 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 308 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 309 haveenv++; 310 311 /* 312 * Set search list to be blank-separated strings 313 * from rest of env value. Permits users of LOCALDOMAIN 314 * to still have a search list, and anyone to set the 315 * one that they want to use as an individual (even more 316 * important now that the rfc1535 stuff restricts searches) 317 */ 318 cp = statp->defdname; 319 pp = statp->dnsrch; 320 *pp++ = cp; 321 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 322 if (*cp == '\n') /*%< silly backwards compat */ 323 break; 324 else if (*cp == ' ' || *cp == '\t') { 325 *cp = 0; 326 n = 1; 327 } else if (n) { 328 *pp++ = cp; 329 n = 0; 330 havesearch = 1; 331 } 332 } 333 /* null terminate last domain if there are excess */ 334 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 335 cp++; 336 *cp = '\0'; 337 *pp++ = 0; 338 } 339 340 #define MATCH(line, name) \ 341 (!strncmp(line, name, sizeof(name) - 1) && \ 342 (line[sizeof(name) - 1] == ' ' || \ 343 line[sizeof(name) - 1] == '\t')) 344 345 nserv = 0; 346 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 347 /* read the config file */ 348 while (fgets(buf, sizeof(buf), fp) != NULL) { 349 /* skip comments */ 350 if (*buf == ';' || *buf == '#') 351 continue; 352 /* read default domain name */ 353 if (MATCH(buf, "domain")) { 354 if (haveenv) /*%< skip if have from environ */ 355 continue; 356 cp = buf + sizeof("domain") - 1; 357 while (*cp == ' ' || *cp == '\t') 358 cp++; 359 if ((*cp == '\0') || (*cp == '\n')) 360 continue; 361 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 362 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 363 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 364 *cp = '\0'; 365 havesearch = 0; 366 continue; 367 } 368 /* set search list */ 369 if (MATCH(buf, "search")) { 370 if (haveenv) /*%< skip if have from environ */ 371 continue; 372 cp = buf + sizeof("search") - 1; 373 while (*cp == ' ' || *cp == '\t') 374 cp++; 375 if ((*cp == '\0') || (*cp == '\n')) 376 continue; 377 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 378 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 379 if ((cp = strchr(statp->defdname, '\n')) != NULL) 380 *cp = '\0'; 381 /* 382 * Set search list to be blank-separated strings 383 * on rest of line. 384 */ 385 cp = statp->defdname; 386 pp = statp->dnsrch; 387 *pp++ = cp; 388 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 389 if (*cp == ' ' || *cp == '\t') { 390 *cp = 0; 391 n = 1; 392 } else if (n) { 393 *pp++ = cp; 394 n = 0; 395 } 396 } 397 /* null terminate last domain if there are excess */ 398 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 399 cp++; 400 *cp = '\0'; 401 *pp++ = 0; 402 havesearch = 1; 403 continue; 404 } 405 /* read nameservers to query */ 406 if (MATCH(buf, "nameserver") && nserv < maxns) { 407 struct addrinfo hints, *ai; 408 char sbuf[NI_MAXSERV]; 409 const size_t minsiz = 410 sizeof(statp->_u._ext.ext->nsaddrs[0]); 411 412 cp = buf + sizeof("nameserver") - 1; 413 while (*cp == ' ' || *cp == '\t') 414 cp++; 415 cp[strcspn(cp, ";# \t\n")] = '\0'; 416 if ((*cp != '\0') && (*cp != '\n')) { 417 memset(&hints, 0, sizeof(hints)); 418 hints.ai_family = PF_UNSPEC; 419 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 420 hints.ai_flags = AI_NUMERICHOST; 421 sprintf(sbuf, "%u", NAMESERVER_PORT); 422 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 423 ai->ai_addrlen <= minsiz) { 424 if (statp->_u._ext.ext != NULL) { 425 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 426 ai->ai_addr, ai->ai_addrlen); 427 } 428 if (ai->ai_addrlen <= 429 sizeof(statp->nsaddr_list[nserv])) { 430 memcpy(&statp->nsaddr_list[nserv], 431 ai->ai_addr, ai->ai_addrlen); 432 } else 433 statp->nsaddr_list[nserv].sin_family = 0; 434 freeaddrinfo(ai); 435 nserv++; 436 } 437 } 438 continue; 439 } 440 #ifdef RESOLVSORT 441 if (MATCH(buf, "sortlist")) { 442 struct in_addr a; 443 444 cp = buf + sizeof("sortlist") - 1; 445 while (nsort < MAXRESOLVSORT) { 446 while (*cp == ' ' || *cp == '\t') 447 cp++; 448 if (*cp == '\0' || *cp == '\n' || *cp == ';') 449 break; 450 net = cp; 451 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 452 isascii(*cp) && !isspace((unsigned char)*cp)) 453 cp++; 454 n = *cp; 455 *cp = 0; 456 if (inet_aton(net, &a)) { 457 statp->sort_list[nsort].addr = a; 458 if (ISSORTMASK(n)) { 459 *cp++ = n; 460 net = cp; 461 while (*cp && *cp != ';' && 462 isascii(*cp) && 463 !isspace((unsigned char)*cp)) 464 cp++; 465 n = *cp; 466 *cp = 0; 467 if (inet_aton(net, &a)) { 468 statp->sort_list[nsort].mask = a.s_addr; 469 } else { 470 statp->sort_list[nsort].mask = 471 net_mask(statp->sort_list[nsort].addr); 472 } 473 } else { 474 statp->sort_list[nsort].mask = 475 net_mask(statp->sort_list[nsort].addr); 476 } 477 nsort++; 478 } 479 *cp = n; 480 } 481 continue; 482 } 483 #endif 484 if (MATCH(buf, "options")) { 485 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 486 continue; 487 } 488 } 489 if (nserv > 0) 490 statp->nscount = nserv; 491 #ifdef RESOLVSORT 492 statp->nsort = nsort; 493 #endif 494 (void) fclose(fp); 495 } 496 /* 497 * Last chance to get a nameserver. This should not normally 498 * be necessary 499 */ 500 #ifdef NO_RESOLV_CONF 501 if(nserv == 0) 502 nserv = get_nameservers(statp); 503 #endif 504 505 if (statp->defdname[0] == 0 && 506 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 507 (cp = strchr(buf, '.')) != NULL) 508 strcpy(statp->defdname, cp + 1); 509 510 /* find components of local domain that might be searched */ 511 if (havesearch == 0) { 512 pp = statp->dnsrch; 513 *pp++ = statp->defdname; 514 *pp = NULL; 515 516 dots = 0; 517 for (cp = statp->defdname; *cp; cp++) 518 dots += (*cp == '.'); 519 520 cp = statp->defdname; 521 while (pp < statp->dnsrch + MAXDFLSRCH) { 522 if (dots < LOCALDOMAINPARTS) 523 break; 524 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 525 *pp++ = cp; 526 dots--; 527 } 528 *pp = NULL; 529 #ifdef DEBUG 530 if (statp->options & RES_DEBUG) { 531 printf(";; res_init()... default dnsrch list:\n"); 532 for (pp = statp->dnsrch; *pp; pp++) 533 printf(";;\t%s\n", *pp); 534 printf(";;\t..END..\n"); 535 } 536 #endif 537 } 538 539 if ((cp = getenv("RES_OPTIONS")) != NULL) 540 res_setoptions(statp, cp, "env"); 541 statp->options |= RES_INIT; 542 return (statp->res_h_errno); 543 } 544 545 static void 546 res_setoptions(res_state statp, const char *options, const char *source) 547 { 548 const char *cp = options; 549 int i; 550 struct __res_state_ext *ext = statp->_u._ext.ext; 551 552 #ifdef DEBUG 553 if (statp->options & RES_DEBUG) 554 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 555 options, source); 556 #endif 557 while (*cp) { 558 /* skip leading and inner runs of spaces */ 559 while (*cp == ' ' || *cp == '\t') 560 cp++; 561 /* search for and process individual options */ 562 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 563 i = atoi(cp + sizeof("ndots:") - 1); 564 if (i <= RES_MAXNDOTS) 565 statp->ndots = i; 566 else 567 statp->ndots = RES_MAXNDOTS; 568 #ifdef DEBUG 569 if (statp->options & RES_DEBUG) 570 printf(";;\tndots=%d\n", statp->ndots); 571 #endif 572 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 573 i = atoi(cp + sizeof("timeout:") - 1); 574 if (i <= RES_MAXRETRANS) 575 statp->retrans = i; 576 else 577 statp->retrans = RES_MAXRETRANS; 578 #ifdef DEBUG 579 if (statp->options & RES_DEBUG) 580 printf(";;\ttimeout=%d\n", statp->retrans); 581 #endif 582 #ifdef SOLARIS2 583 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 584 /* 585 * For backward compatibility, 'retrans' is 586 * supported as an alias for 'timeout', though 587 * without an imposed maximum. 588 */ 589 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 590 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 591 /* 592 * For backward compatibility, 'retry' is 593 * supported as an alias for 'attempts', though 594 * without an imposed maximum. 595 */ 596 statp->retry = atoi(cp + sizeof("retry:") - 1); 597 #endif /* SOLARIS2 */ 598 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 599 i = atoi(cp + sizeof("attempts:") - 1); 600 if (i <= RES_MAXRETRY) 601 statp->retry = i; 602 else 603 statp->retry = RES_MAXRETRY; 604 #ifdef DEBUG 605 if (statp->options & RES_DEBUG) 606 printf(";;\tattempts=%d\n", statp->retry); 607 #endif 608 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 609 #ifdef DEBUG 610 if (!(statp->options & RES_DEBUG)) { 611 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 612 options, source); 613 statp->options |= RES_DEBUG; 614 } 615 printf(";;\tdebug\n"); 616 #endif 617 } else if (!strncmp(cp, "no_tld_query", 618 sizeof("no_tld_query") - 1) || 619 !strncmp(cp, "no-tld-query", 620 sizeof("no-tld-query") - 1)) { 621 statp->options |= RES_NOTLDQUERY; 622 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 623 statp->options |= RES_USE_INET6; 624 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 625 statp->options |= RES_ROTATE; 626 } else if (!strncmp(cp, "no-check-names", 627 sizeof("no-check-names") - 1)) { 628 statp->options |= RES_NOCHECKNAME; 629 } 630 #ifdef RES_USE_EDNS0 631 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 632 statp->options |= RES_USE_EDNS0; 633 } 634 #endif 635 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 636 statp->options |= RES_USE_DNAME; 637 } 638 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 639 if (ext == NULL) 640 goto skip; 641 cp += sizeof("nibble:") - 1; 642 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 643 strncpy(ext->nsuffix, cp, (size_t)i); 644 ext->nsuffix[i] = '\0'; 645 } 646 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 647 if (ext == NULL) 648 goto skip; 649 cp += sizeof("nibble2:") - 1; 650 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 651 strncpy(ext->nsuffix2, cp, (size_t)i); 652 ext->nsuffix2[i] = '\0'; 653 } 654 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 655 cp += sizeof("v6revmode:") - 1; 656 /* "nibble" and "bitstring" used to be valid */ 657 if (!strncmp(cp, "single", sizeof("single") - 1)) { 658 statp->options |= RES_NO_NIBBLE2; 659 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 660 statp->options &= 661 ~RES_NO_NIBBLE2; 662 } 663 } 664 else { 665 /* XXX - print a warning here? */ 666 } 667 skip: 668 /* skip to next run of spaces */ 669 while (*cp && *cp != ' ' && *cp != '\t') 670 cp++; 671 } 672 } 673 674 #ifdef RESOLVSORT 675 /* XXX - should really support CIDR which means explicit masks always. */ 676 static u_int32_t 677 net_mask(in) /*!< XXX - should really use system's version of this */ 678 struct in_addr in; 679 { 680 register u_int32_t i = ntohl(in.s_addr); 681 682 if (IN_CLASSA(i)) 683 return (htonl(IN_CLASSA_NET)); 684 else if (IN_CLASSB(i)) 685 return (htonl(IN_CLASSB_NET)); 686 return (htonl(IN_CLASSC_NET)); 687 } 688 #endif 689 690 void 691 res_rndinit(res_state statp) 692 { 693 struct timeval now; 694 u_int32_t u32; 695 u_int16_t u16; 696 697 gettimeofday(&now, NULL); 698 u32 = now.tv_sec; 699 memcpy(statp->_rnd, &u32, 4); 700 u32 = now.tv_usec; 701 memcpy(statp->_rnd + 4, &u32, 4); 702 u32 += now.tv_sec; 703 memcpy(statp->_rnd + 8, &u32, 4); 704 u16 = getpid(); 705 memcpy(statp->_rnd + 12, &u16, 2); 706 } 707 708 u_int 709 res_nrandomid(res_state statp) { 710 struct timeval now; 711 u_int16_t u16; 712 MD5_CTX ctx; 713 714 gettimeofday(&now, NULL); 715 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 716 memcpy(statp->_rnd + 14, &u16, 2); 717 #ifndef HAVE_MD5 718 MD5_Init(&ctx); 719 MD5_Update(&ctx, statp->_rnd, 16); 720 MD5_Final(statp->_rnd, &ctx); 721 #else 722 MD5Init(&ctx); 723 MD5Update(&ctx, statp->_rnd, 16); 724 MD5Final(statp->_rnd, &ctx); 725 #endif 726 memcpy(&u16, statp->_rnd + 14, 2); 727 return ((u_int) u16); 728 } 729 730 /*% 731 * This routine is for closing the socket if a virtual circuit is used and 732 * the program wants to close it. This provides support for endhostent() 733 * which expects to close the socket. 734 * 735 * This routine is not expected to be user visible. 736 */ 737 void 738 res_nclose(res_state statp) { 739 int ns; 740 741 if (statp->_vcsock >= 0) { 742 (void) close(statp->_vcsock); 743 statp->_vcsock = -1; 744 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 745 } 746 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 747 if (statp->_u._ext.nssocks[ns] != -1) { 748 (void) close(statp->_u._ext.nssocks[ns]); 749 statp->_u._ext.nssocks[ns] = -1; 750 } 751 } 752 } 753 754 void 755 res_ndestroy(res_state statp) { 756 res_nclose(statp); 757 if (statp->_u._ext.ext != NULL) 758 free(statp->_u._ext.ext); 759 statp->options &= ~RES_INIT; 760 statp->_u._ext.ext = NULL; 761 } 762 763 const char * 764 res_get_nibblesuffix(res_state statp) { 765 if (statp->_u._ext.ext) 766 return (statp->_u._ext.ext->nsuffix); 767 return ("ip6.arpa"); 768 } 769 770 const char * 771 res_get_nibblesuffix2(res_state statp) { 772 if (statp->_u._ext.ext) 773 return (statp->_u._ext.ext->nsuffix2); 774 return ("ip6.int"); 775 } 776 777 void 778 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 779 int i, nserv; 780 size_t size; 781 782 /* close open servers */ 783 res_nclose(statp); 784 785 /* cause rtt times to be forgotten */ 786 statp->_u._ext.nscount = 0; 787 788 nserv = 0; 789 for (i = 0; i < cnt && nserv < MAXNS; i++) { 790 switch (set->sin.sin_family) { 791 case AF_INET: 792 size = sizeof(set->sin); 793 if (statp->_u._ext.ext) 794 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 795 &set->sin, size); 796 if (size <= sizeof(statp->nsaddr_list[nserv])) 797 memcpy(&statp->nsaddr_list[nserv], 798 &set->sin, size); 799 else 800 statp->nsaddr_list[nserv].sin_family = 0; 801 nserv++; 802 break; 803 804 #ifdef HAS_INET6_STRUCTS 805 case AF_INET6: 806 size = sizeof(set->sin6); 807 if (statp->_u._ext.ext) 808 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 809 &set->sin6, size); 810 if (size <= sizeof(statp->nsaddr_list[nserv])) 811 memcpy(&statp->nsaddr_list[nserv], 812 &set->sin6, size); 813 else 814 statp->nsaddr_list[nserv].sin_family = 0; 815 nserv++; 816 break; 817 #endif 818 819 default: 820 break; 821 } 822 set++; 823 } 824 statp->nscount = nserv; 825 826 } 827 828 int 829 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 830 int i; 831 size_t size; 832 u_int16_t family; 833 834 for (i = 0; i < statp->nscount && i < cnt; i++) { 835 if (statp->_u._ext.ext) 836 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 837 else 838 family = statp->nsaddr_list[i].sin_family; 839 840 switch (family) { 841 case AF_INET: 842 size = sizeof(set->sin); 843 if (statp->_u._ext.ext) 844 memcpy(&set->sin, 845 &statp->_u._ext.ext->nsaddrs[i], 846 size); 847 else 848 memcpy(&set->sin, &statp->nsaddr_list[i], 849 size); 850 break; 851 852 #ifdef HAS_INET6_STRUCTS 853 case AF_INET6: 854 size = sizeof(set->sin6); 855 if (statp->_u._ext.ext) 856 memcpy(&set->sin6, 857 &statp->_u._ext.ext->nsaddrs[i], 858 size); 859 else 860 memcpy(&set->sin6, &statp->nsaddr_list[i], 861 size); 862 break; 863 #endif 864 865 default: 866 set->sin.sin_family = 0; 867 break; 868 } 869 set++; 870 } 871 return (statp->nscount); 872 } 873 874 /*! \file */ 875
Indexes created Sun Sep 21 19:09:51 GMT 2025