res_init.c revision 1.19
1 /* $NetBSD: res_init.c,v 1.19 2009/04/16 14:56:51 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 1.19 2009/04/16 14:56:51 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 res_rndinit(statp); 216 statp->id = res_nrandomid(statp); 217 } 218 219 if ((statp->options & RES_INIT) != 0U) 220 res_ndestroy(statp); 221 222 memset(u, 0, sizeof(u)); 223 #ifdef USELOOPBACK 224 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 225 #else 226 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 227 #endif 228 u[nserv].sin.sin_family = AF_INET; 229 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 230 #ifdef HAVE_SA_LEN 231 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 232 #endif 233 nserv++; 234 #ifdef HAS_INET6_STRUCTS 235 #ifdef USELOOPBACK 236 u[nserv].sin6.sin6_addr = in6addr_loopback; 237 #else 238 u[nserv].sin6.sin6_addr = in6addr_any; 239 #endif 240 u[nserv].sin6.sin6_family = AF_INET6; 241 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 242 #ifdef HAVE_SA_LEN 243 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 244 #endif 245 nserv++; 246 #endif 247 statp->nscount = 0; 248 statp->ndots = 1; 249 statp->pfcode = 0; 250 statp->_vcsock = -1; 251 statp->_flags = 0; 252 statp->qhook = NULL; 253 statp->rhook = NULL; 254 statp->_u._ext.nscount = 0; 255 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 256 if (statp->_u._ext.ext != NULL) { 257 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 258 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 259 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 260 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 261 } else { 262 /* 263 * Historically res_init() rarely, if at all, failed. 264 * Examples and applications exist which do not check 265 * our return code. Furthermore several applications 266 * simply call us to get the systems domainname. So 267 * rather then immediately fail here we store the 268 * failure, which is returned later, in h_errno. And 269 * prevent the collection of 'nameserver' information 270 * by setting maxns to 0. Thus applications that fail 271 * to check our return code wont be able to make 272 * queries anyhow. 273 */ 274 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 275 maxns = 0; 276 } 277 #ifdef RESOLVSORT 278 statp->nsort = 0; 279 #endif 280 res_setservers(statp, u, nserv); 281 282 #ifdef SOLARIS2 283 /* 284 * The old libresolv derived the defaultdomain from NIS/NIS+. 285 * We want to keep this behaviour 286 */ 287 { 288 char buf[sizeof(statp->defdname)], *cp; 289 int ret; 290 291 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 292 (unsigned int)ret <= sizeof(buf)) { 293 if (buf[0] == '+') 294 buf[0] = '.'; 295 cp = strchr(buf, '.'); 296 cp = (cp == NULL) ? buf : (cp + 1); 297 (void)strlcpy(statp->defdname, cp, 298 sizeof(statp->defdname)); 299 } 300 } 301 #endif /* SOLARIS2 */ 302 303 /* Allow user to override the local domain definition */ 304 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 305 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 306 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 307 haveenv++; 308 309 /* 310 * Set search list to be blank-separated strings 311 * from rest of env value. Permits users of LOCALDOMAIN 312 * to still have a search list, and anyone to set the 313 * one that they want to use as an individual (even more 314 * important now that the rfc1535 stuff restricts searches) 315 */ 316 cp = statp->defdname; 317 pp = statp->dnsrch; 318 *pp++ = cp; 319 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 320 if (*cp == '\n') /*%< silly backwards compat */ 321 break; 322 else if (*cp == ' ' || *cp == '\t') { 323 *cp = 0; 324 n = 1; 325 } else if (n) { 326 *pp++ = cp; 327 n = 0; 328 havesearch = 1; 329 } 330 } 331 /* null terminate last domain if there are excess */ 332 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 333 cp++; 334 *cp = '\0'; 335 *pp++ = 0; 336 } 337 338 #define MATCH(line, name) \ 339 (!strncmp(line, name, sizeof(name) - 1) && \ 340 (line[sizeof(name) - 1] == ' ' || \ 341 line[sizeof(name) - 1] == '\t')) 342 343 nserv = 0; 344 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 345 /* read the config file */ 346 while (fgets(buf, sizeof(buf), fp) != NULL) { 347 /* skip comments */ 348 if (*buf == ';' || *buf == '#') 349 continue; 350 /* read default domain name */ 351 if (MATCH(buf, "domain")) { 352 if (haveenv) /*%< skip if have from environ */ 353 continue; 354 cp = buf + sizeof("domain") - 1; 355 while (*cp == ' ' || *cp == '\t') 356 cp++; 357 if ((*cp == '\0') || (*cp == '\n')) 358 continue; 359 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 360 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 361 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 362 *cp = '\0'; 363 havesearch = 0; 364 continue; 365 } 366 /* set search list */ 367 if (MATCH(buf, "search")) { 368 if (haveenv) /*%< skip if have from environ */ 369 continue; 370 cp = buf + sizeof("search") - 1; 371 while (*cp == ' ' || *cp == '\t') 372 cp++; 373 if ((*cp == '\0') || (*cp == '\n')) 374 continue; 375 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 376 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 377 if ((cp = strchr(statp->defdname, '\n')) != NULL) 378 *cp = '\0'; 379 /* 380 * Set search list to be blank-separated strings 381 * on rest of line. 382 */ 383 cp = statp->defdname; 384 pp = statp->dnsrch; 385 *pp++ = cp; 386 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 387 if (*cp == ' ' || *cp == '\t') { 388 *cp = 0; 389 n = 1; 390 } else if (n) { 391 *pp++ = cp; 392 n = 0; 393 } 394 } 395 /* null terminate last domain if there are excess */ 396 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 397 cp++; 398 *cp = '\0'; 399 *pp++ = 0; 400 havesearch = 1; 401 continue; 402 } 403 /* read nameservers to query */ 404 if (MATCH(buf, "nameserver") && nserv < maxns) { 405 struct addrinfo hints, *ai; 406 char sbuf[NI_MAXSERV]; 407 const size_t minsiz = 408 sizeof(statp->_u._ext.ext->nsaddrs[0]); 409 410 cp = buf + sizeof("nameserver") - 1; 411 while (*cp == ' ' || *cp == '\t') 412 cp++; 413 cp[strcspn(cp, ";# \t\n")] = '\0'; 414 if ((*cp != '\0') && (*cp != '\n')) { 415 memset(&hints, 0, sizeof(hints)); 416 hints.ai_family = PF_UNSPEC; 417 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 418 hints.ai_flags = AI_NUMERICHOST; 419 sprintf(sbuf, "%u", NAMESERVER_PORT); 420 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 421 ai->ai_addrlen <= minsiz) { 422 if (statp->_u._ext.ext != NULL) { 423 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 424 ai->ai_addr, ai->ai_addrlen); 425 } 426 if (ai->ai_addrlen <= 427 sizeof(statp->nsaddr_list[nserv])) { 428 memcpy(&statp->nsaddr_list[nserv], 429 ai->ai_addr, ai->ai_addrlen); 430 } else 431 statp->nsaddr_list[nserv].sin_family = 0; 432 freeaddrinfo(ai); 433 nserv++; 434 } 435 } 436 continue; 437 } 438 #ifdef RESOLVSORT 439 if (MATCH(buf, "sortlist")) { 440 struct in_addr a; 441 442 cp = buf + sizeof("sortlist") - 1; 443 while (nsort < MAXRESOLVSORT) { 444 while (*cp == ' ' || *cp == '\t') 445 cp++; 446 if (*cp == '\0' || *cp == '\n' || *cp == ';') 447 break; 448 net = cp; 449 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 450 isascii(*cp) && !isspace((unsigned char)*cp)) 451 cp++; 452 n = *cp; 453 *cp = 0; 454 if (inet_aton(net, &a)) { 455 statp->sort_list[nsort].addr = a; 456 if (ISSORTMASK(n)) { 457 *cp++ = n; 458 net = cp; 459 while (*cp && *cp != ';' && 460 isascii(*cp) && 461 !isspace((unsigned char)*cp)) 462 cp++; 463 n = *cp; 464 *cp = 0; 465 if (inet_aton(net, &a)) { 466 statp->sort_list[nsort].mask = a.s_addr; 467 } else { 468 statp->sort_list[nsort].mask = 469 net_mask(statp->sort_list[nsort].addr); 470 } 471 } else { 472 statp->sort_list[nsort].mask = 473 net_mask(statp->sort_list[nsort].addr); 474 } 475 nsort++; 476 } 477 *cp = n; 478 } 479 continue; 480 } 481 #endif 482 if (MATCH(buf, "options")) { 483 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 484 continue; 485 } 486 } 487 if (nserv > 0) 488 statp->nscount = nserv; 489 #ifdef RESOLVSORT 490 statp->nsort = nsort; 491 #endif 492 (void) fclose(fp); 493 } 494 /* 495 * Last chance to get a nameserver. This should not normally 496 * be necessary 497 */ 498 #ifdef NO_RESOLV_CONF 499 if(nserv == 0) 500 nserv = get_nameservers(statp); 501 #endif 502 503 if (statp->defdname[0] == 0 && 504 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 505 (cp = strchr(buf, '.')) != NULL) 506 strcpy(statp->defdname, cp + 1); 507 508 /* find components of local domain that might be searched */ 509 if (havesearch == 0) { 510 pp = statp->dnsrch; 511 *pp++ = statp->defdname; 512 *pp = NULL; 513 514 dots = 0; 515 for (cp = statp->defdname; *cp; cp++) 516 dots += (*cp == '.'); 517 518 cp = statp->defdname; 519 while (pp < statp->dnsrch + MAXDFLSRCH) { 520 if (dots < LOCALDOMAINPARTS) 521 break; 522 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 523 *pp++ = cp; 524 dots--; 525 } 526 *pp = NULL; 527 #ifdef DEBUG 528 if (statp->options & RES_DEBUG) { 529 printf(";; res_init()... default dnsrch list:\n"); 530 for (pp = statp->dnsrch; *pp; pp++) 531 printf(";;\t%s\n", *pp); 532 printf(";;\t..END..\n"); 533 } 534 #endif 535 } 536 537 if ((cp = getenv("RES_OPTIONS")) != NULL) 538 res_setoptions(statp, cp, "env"); 539 statp->options |= RES_INIT; 540 return (statp->res_h_errno); 541 } 542 543 static void 544 res_setoptions(res_state statp, const char *options, const char *source) 545 { 546 const char *cp = options; 547 int i; 548 struct __res_state_ext *ext = statp->_u._ext.ext; 549 550 #ifdef DEBUG 551 if (statp->options & RES_DEBUG) 552 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 553 options, source); 554 #endif 555 while (*cp) { 556 /* skip leading and inner runs of spaces */ 557 while (*cp == ' ' || *cp == '\t') 558 cp++; 559 /* search for and process individual options */ 560 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 561 i = atoi(cp + sizeof("ndots:") - 1); 562 if (i <= RES_MAXNDOTS) 563 statp->ndots = i; 564 else 565 statp->ndots = RES_MAXNDOTS; 566 #ifdef DEBUG 567 if (statp->options & RES_DEBUG) 568 printf(";;\tndots=%d\n", statp->ndots); 569 #endif 570 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 571 i = atoi(cp + sizeof("timeout:") - 1); 572 if (i <= RES_MAXRETRANS) 573 statp->retrans = i; 574 else 575 statp->retrans = RES_MAXRETRANS; 576 #ifdef DEBUG 577 if (statp->options & RES_DEBUG) 578 printf(";;\ttimeout=%d\n", statp->retrans); 579 #endif 580 #ifdef SOLARIS2 581 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 582 /* 583 * For backward compatibility, 'retrans' is 584 * supported as an alias for 'timeout', though 585 * without an imposed maximum. 586 */ 587 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 588 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 589 /* 590 * For backward compatibility, 'retry' is 591 * supported as an alias for 'attempts', though 592 * without an imposed maximum. 593 */ 594 statp->retry = atoi(cp + sizeof("retry:") - 1); 595 #endif /* SOLARIS2 */ 596 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 597 i = atoi(cp + sizeof("attempts:") - 1); 598 if (i <= RES_MAXRETRY) 599 statp->retry = i; 600 else 601 statp->retry = RES_MAXRETRY; 602 #ifdef DEBUG 603 if (statp->options & RES_DEBUG) 604 printf(";;\tattempts=%d\n", statp->retry); 605 #endif 606 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 607 #ifdef DEBUG 608 if (!(statp->options & RES_DEBUG)) { 609 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 610 options, source); 611 statp->options |= RES_DEBUG; 612 } 613 printf(";;\tdebug\n"); 614 #endif 615 } else if (!strncmp(cp, "no_tld_query", 616 sizeof("no_tld_query") - 1) || 617 !strncmp(cp, "no-tld-query", 618 sizeof("no-tld-query") - 1)) { 619 statp->options |= RES_NOTLDQUERY; 620 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 621 statp->options |= RES_USE_INET6; 622 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 623 statp->options |= RES_ROTATE; 624 } else if (!strncmp(cp, "no-check-names", 625 sizeof("no-check-names") - 1)) { 626 statp->options |= RES_NOCHECKNAME; 627 } 628 #ifdef RES_USE_EDNS0 629 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 630 statp->options |= RES_USE_EDNS0; 631 } 632 #endif 633 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 634 statp->options |= RES_USE_DNAME; 635 } 636 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 637 if (ext == NULL) 638 goto skip; 639 cp += sizeof("nibble:") - 1; 640 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 641 strncpy(ext->nsuffix, cp, (size_t)i); 642 ext->nsuffix[i] = '\0'; 643 } 644 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 645 if (ext == NULL) 646 goto skip; 647 cp += sizeof("nibble2:") - 1; 648 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 649 strncpy(ext->nsuffix2, cp, (size_t)i); 650 ext->nsuffix2[i] = '\0'; 651 } 652 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 653 cp += sizeof("v6revmode:") - 1; 654 /* "nibble" and "bitstring" used to be valid */ 655 if (!strncmp(cp, "single", sizeof("single") - 1)) { 656 statp->options |= RES_NO_NIBBLE2; 657 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 658 statp->options &= 659 ~RES_NO_NIBBLE2; 660 } 661 } 662 else { 663 /* XXX - print a warning here? */ 664 } 665 skip: 666 /* skip to next run of spaces */ 667 while (*cp && *cp != ' ' && *cp != '\t') 668 cp++; 669 } 670 } 671 672 #ifdef RESOLVSORT 673 /* XXX - should really support CIDR which means explicit masks always. */ 674 static u_int32_t 675 net_mask(in) /*!< XXX - should really use system's version of this */ 676 struct in_addr in; 677 { 678 register u_int32_t i = ntohl(in.s_addr); 679 680 if (IN_CLASSA(i)) 681 return (htonl(IN_CLASSA_NET)); 682 else if (IN_CLASSB(i)) 683 return (htonl(IN_CLASSB_NET)); 684 return (htonl(IN_CLASSC_NET)); 685 } 686 #endif 687 688 void 689 res_rndinit(res_state statp) 690 { 691 struct timeval now; 692 u_int32_t u32; 693 u_int16_t u16; 694 695 gettimeofday(&now, NULL); 696 u32 = (u_int32_t)now.tv_sec; 697 memcpy(statp->_rnd, &u32, 4); 698 u32 = now.tv_usec; 699 memcpy(statp->_rnd + 4, &u32, 4); 700 u32 += (u_int32_t)now.tv_sec; 701 memcpy(statp->_rnd + 8, &u32, 4); 702 u16 = getpid(); 703 memcpy(statp->_rnd + 12, &u16, 2); 704 } 705 706 u_int 707 res_nrandomid(res_state statp) { 708 struct timeval now; 709 u_int16_t u16; 710 MD5_CTX ctx; 711 712 gettimeofday(&now, NULL); 713 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 714 memcpy(statp->_rnd + 14, &u16, 2); 715 #ifndef HAVE_MD5 716 MD5_Init(&ctx); 717 MD5_Update(&ctx, statp->_rnd, 16); 718 MD5_Final(statp->_rnd, &ctx); 719 #else 720 MD5Init(&ctx); 721 MD5Update(&ctx, statp->_rnd, 16); 722 MD5Final(statp->_rnd, &ctx); 723 #endif 724 memcpy(&u16, statp->_rnd + 14, 2); 725 return ((u_int) u16); 726 } 727 728 /*% 729 * This routine is for closing the socket if a virtual circuit is used and 730 * the program wants to close it. This provides support for endhostent() 731 * which expects to close the socket. 732 * 733 * This routine is not expected to be user visible. 734 */ 735 void 736 res_nclose(res_state statp) { 737 int ns; 738 739 if (statp->_vcsock >= 0) { 740 (void) close(statp->_vcsock); 741 statp->_vcsock = -1; 742 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 743 } 744 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 745 if (statp->_u._ext.nssocks[ns] != -1) { 746 (void) close(statp->_u._ext.nssocks[ns]); 747 statp->_u._ext.nssocks[ns] = -1; 748 } 749 } 750 } 751 752 void 753 res_ndestroy(res_state statp) { 754 res_nclose(statp); 755 if (statp->_u._ext.ext != NULL) 756 free(statp->_u._ext.ext); 757 statp->options &= ~RES_INIT; 758 statp->_u._ext.ext = NULL; 759 } 760 761 const char * 762 res_get_nibblesuffix(res_state statp) { 763 if (statp->_u._ext.ext) 764 return (statp->_u._ext.ext->nsuffix); 765 return ("ip6.arpa"); 766 } 767 768 const char * 769 res_get_nibblesuffix2(res_state statp) { 770 if (statp->_u._ext.ext) 771 return (statp->_u._ext.ext->nsuffix2); 772 return ("ip6.int"); 773 } 774 775 void 776 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 777 int i, nserv; 778 size_t size; 779 780 /* close open servers */ 781 res_nclose(statp); 782 783 /* cause rtt times to be forgotten */ 784 statp->_u._ext.nscount = 0; 785 786 nserv = 0; 787 for (i = 0; i < cnt && nserv < MAXNS; i++) { 788 switch (set->sin.sin_family) { 789 case AF_INET: 790 size = sizeof(set->sin); 791 if (statp->_u._ext.ext) 792 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 793 &set->sin, size); 794 if (size <= sizeof(statp->nsaddr_list[nserv])) 795 memcpy(&statp->nsaddr_list[nserv], 796 &set->sin, size); 797 else 798 statp->nsaddr_list[nserv].sin_family = 0; 799 nserv++; 800 break; 801 802 #ifdef HAS_INET6_STRUCTS 803 case AF_INET6: 804 size = sizeof(set->sin6); 805 if (statp->_u._ext.ext) 806 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 807 &set->sin6, size); 808 if (size <= sizeof(statp->nsaddr_list[nserv])) 809 memcpy(&statp->nsaddr_list[nserv], 810 &set->sin6, size); 811 else 812 statp->nsaddr_list[nserv].sin_family = 0; 813 nserv++; 814 break; 815 #endif 816 817 default: 818 break; 819 } 820 set++; 821 } 822 statp->nscount = nserv; 823 824 } 825 826 int 827 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 828 int i; 829 size_t size; 830 u_int16_t family; 831 832 for (i = 0; i < statp->nscount && i < cnt; i++) { 833 if (statp->_u._ext.ext) 834 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 835 else 836 family = statp->nsaddr_list[i].sin_family; 837 838 switch (family) { 839 case AF_INET: 840 size = sizeof(set->sin); 841 if (statp->_u._ext.ext) 842 memcpy(&set->sin, 843 &statp->_u._ext.ext->nsaddrs[i], 844 size); 845 else 846 memcpy(&set->sin, &statp->nsaddr_list[i], 847 size); 848 break; 849 850 #ifdef HAS_INET6_STRUCTS 851 case AF_INET6: 852 size = sizeof(set->sin6); 853 if (statp->_u._ext.ext) 854 memcpy(&set->sin6, 855 &statp->_u._ext.ext->nsaddrs[i], 856 size); 857 else 858 memcpy(&set->sin6, &statp->nsaddr_list[i], 859 size); 860 break; 861 #endif 862 863 default: 864 set->sin.sin_family = 0; 865 break; 866 } 867 set++; 868 } 869 return (statp->nscount); 870 } 871 872 /*! \file */ 873
Indexes created Tue Sep 23 23:09:58 GMT 2025