res_init.c revision 165258
1/* 2 * Copyright (c) 1985, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34/* 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 */ 53 54/* 55 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 57 * 58 * Permission to use, copy, modify, and distribute this software for any 59 * purpose with or without fee is hereby granted, provided that the above 60 * copyright notice and this permission notice appear in all copies. 61 * 62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 64 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 69 */ 70 71#if defined(LIBC_SCCS) && !defined(lint) 72static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 73static const char rcsid[] = "$Id: res_init.c,v 1.9.2.5.4.6 2006/08/30 23:23:01 marka Exp $"; 74#endif /* LIBC_SCCS and not lint */ 75#include <sys/cdefs.h> 76__FBSDID("$FreeBSD: head/lib/libc/resolv/res_init.c 165258 2006-12-15 20:59:55Z ume $"); 77 78#include "port_before.h" 79 80#include "namespace.h" 81 82#include <sys/types.h> 83#include <sys/param.h> 84#include <sys/socket.h> 85#include <sys/time.h> 86 87#include <netinet/in.h> 88#include <arpa/inet.h> 89#include <arpa/nameser.h> 90 91#include <ctype.h> 92#include <stdio.h> 93#include <stdlib.h> 94#include <string.h> 95#include <unistd.h> 96#include <netdb.h> 97 98#include "un-namespace.h" 99 100#include "port_after.h" 101 102/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 103#include <resolv.h> 104 105#include "res_private.h" 106 107/* Options. Should all be left alone. */ 108#define RESOLVSORT 109#define DEBUG 110 111#ifdef SOLARIS2 112#include <sys/systeminfo.h> 113#endif 114 115static void res_setoptions(res_state, const char *, const char *); 116 117#ifdef RESOLVSORT 118static const char sort_mask[] = "/&"; 119#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 120static u_int32_t net_mask(struct in_addr); 121#endif 122 123#if !defined(isascii) /* XXX - could be a function */ 124# define isascii(c) (!(c & 0200)) 125#endif 126 127/* 128 * Resolver state default settings. 129 */ 130 131/* 132 * Set up default settings. If the configuration file exist, the values 133 * there will have precedence. Otherwise, the server address is set to 134 * INADDR_ANY and the default domain name comes from the gethostname(). 135 * 136 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 137 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 138 * since it was noted that INADDR_ANY actually meant ``the first interface 139 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 140 * it had to be "up" in order for you to reach your own name server. It 141 * was later decided that since the recommended practice is to always 142 * install local static routes through 127.0.0.1 for all your network 143 * interfaces, that we could solve this problem without a code change. 144 * 145 * The configuration file should always be used, since it is the only way 146 * to specify a default domain. If you are running a server on your local 147 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 148 * in the configuration file. 149 * 150 * Return 0 if completes successfully, -1 on error 151 */ 152int 153res_ninit(res_state statp) { 154 extern int __res_vinit(res_state, int); 155 156 return (__res_vinit(statp, 0)); 157} 158 159/* This function has to be reachable by res_data.c but not publically. */ 160int 161__res_vinit(res_state statp, int preinit) { 162 FILE *fp; 163 char *cp, **pp; 164 int n; 165 char buf[BUFSIZ]; 166 int nserv = 0; /* number of nameserver records read from file */ 167 int haveenv = 0; 168 int havesearch = 0; 169#ifdef RESOLVSORT 170 int nsort = 0; 171 char *net; 172#endif 173 int dots; 174 union res_sockaddr_union u[2]; 175 176 if (statp->_u._ext.ext != NULL) 177 res_ndestroy(statp); 178 179 if (!preinit) { 180 statp->retrans = RES_TIMEOUT; 181 statp->retry = RES_DFLRETRY; 182 statp->options = RES_DEFAULT; 183 statp->id = res_randomid(); 184 } 185 186 memset(u, 0, sizeof(u)); 187#ifdef USELOOPBACK 188 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 189#else 190 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 191#endif 192 u[nserv].sin.sin_family = AF_INET; 193 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 194#ifdef HAVE_SA_LEN 195 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 196#endif 197 nserv++; 198#ifdef HAS_INET6_STRUCTS 199#ifdef USELOOPBACK 200 u[nserv].sin6.sin6_addr = in6addr_loopback; 201#else 202 u[nserv].sin6.sin6_addr = in6addr_any; 203#endif 204 u[nserv].sin6.sin6_family = AF_INET6; 205 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 206#ifdef HAVE_SA_LEN 207 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 208#endif 209 nserv++; 210#endif 211 statp->nscount = 0; 212 statp->ndots = 1; 213 statp->pfcode = 0; 214 statp->_vcsock = -1; 215 statp->_flags = 0; 216 statp->qhook = NULL; 217 statp->rhook = NULL; 218 statp->_u._ext.nscount = 0; 219 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 220 if (statp->_u._ext.ext != NULL) { 221 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 222 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 223 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 224 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 225 } else 226 return (-1); 227#ifdef RESOLVSORT 228 statp->nsort = 0; 229#endif 230 res_setservers(statp, u, nserv); 231 232#ifdef SOLARIS2 233 /* 234 * The old libresolv derived the defaultdomain from NIS/NIS+. 235 * We want to keep this behaviour 236 */ 237 { 238 char buf[sizeof(statp->defdname)], *cp; 239 int ret; 240 241 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 242 (unsigned int)ret <= sizeof(buf)) { 243 if (buf[0] == '+') 244 buf[0] = '.'; 245 cp = strchr(buf, '.'); 246 cp = (cp == NULL) ? buf : (cp + 1); 247 if (strlen(cp) >= sizeof(statp->defdname)) 248 goto freedata; 249 strcpy(statp->defdname, cp); 250 } 251 } 252#endif /* SOLARIS2 */ 253 254 /* Allow user to override the local domain definition */ 255 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 256 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 257 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 258 haveenv++; 259 260 /* 261 * Set search list to be blank-separated strings 262 * from rest of env value. Permits users of LOCALDOMAIN 263 * to still have a search list, and anyone to set the 264 * one that they want to use as an individual (even more 265 * important now that the rfc1535 stuff restricts searches) 266 */ 267 cp = statp->defdname; 268 pp = statp->dnsrch; 269 *pp++ = cp; 270 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 271 if (*cp == '\n') /* silly backwards compat */ 272 break; 273 else if (*cp == ' ' || *cp == '\t') { 274 *cp = 0; 275 n = 1; 276 } else if (n) { 277 *pp++ = cp; 278 n = 0; 279 havesearch = 1; 280 } 281 } 282 /* null terminate last domain if there are excess */ 283 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 284 cp++; 285 *cp = '\0'; 286 *pp++ = 0; 287 } 288 289#define MATCH(line, name) \ 290 (!strncmp(line, name, sizeof(name) - 1) && \ 291 (line[sizeof(name) - 1] == ' ' || \ 292 line[sizeof(name) - 1] == '\t')) 293 294 nserv = 0; 295 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 296 /* read the config file */ 297 while (fgets(buf, sizeof(buf), fp) != NULL) { 298 /* skip comments */ 299 if (*buf == ';' || *buf == '#') 300 continue; 301 /* read default domain name */ 302 if (MATCH(buf, "domain")) { 303 if (haveenv) /* skip if have from environ */ 304 continue; 305 cp = buf + sizeof("domain") - 1; 306 while (*cp == ' ' || *cp == '\t') 307 cp++; 308 if ((*cp == '\0') || (*cp == '\n')) 309 continue; 310 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 311 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 312 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 313 *cp = '\0'; 314 havesearch = 0; 315 continue; 316 } 317 /* set search list */ 318 if (MATCH(buf, "search")) { 319 if (haveenv) /* skip if have from environ */ 320 continue; 321 cp = buf + sizeof("search") - 1; 322 while (*cp == ' ' || *cp == '\t') 323 cp++; 324 if ((*cp == '\0') || (*cp == '\n')) 325 continue; 326 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 327 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 328 if ((cp = strchr(statp->defdname, '\n')) != NULL) 329 *cp = '\0'; 330 /* 331 * Set search list to be blank-separated strings 332 * on rest of line. 333 */ 334 cp = statp->defdname; 335 pp = statp->dnsrch; 336 *pp++ = cp; 337 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 338 if (*cp == ' ' || *cp == '\t') { 339 *cp = 0; 340 n = 1; 341 } else if (n) { 342 *pp++ = cp; 343 n = 0; 344 } 345 } 346 /* null terminate last domain if there are excess */ 347 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 348 cp++; 349 *cp = '\0'; 350 *pp++ = 0; 351 havesearch = 1; 352 continue; 353 } 354 /* read nameservers to query */ 355 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 356 struct addrinfo hints, *ai; 357 char sbuf[NI_MAXSERV]; 358 const size_t minsiz = 359 sizeof(statp->_u._ext.ext->nsaddrs[0]); 360 361 cp = buf + sizeof("nameserver") - 1; 362 while (*cp == ' ' || *cp == '\t') 363 cp++; 364 cp[strcspn(cp, ";# \t\n")] = '\0'; 365 if ((*cp != '\0') && (*cp != '\n')) { 366 memset(&hints, 0, sizeof(hints)); 367 hints.ai_family = PF_UNSPEC; 368 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 369 hints.ai_flags = AI_NUMERICHOST; 370 sprintf(sbuf, "%u", NAMESERVER_PORT); 371 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 372 ai->ai_addrlen <= minsiz) { 373 if (statp->_u._ext.ext != NULL) { 374 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 375 ai->ai_addr, ai->ai_addrlen); 376 } 377 if (ai->ai_addrlen <= 378 sizeof(statp->nsaddr_list[nserv])) { 379 memcpy(&statp->nsaddr_list[nserv], 380 ai->ai_addr, ai->ai_addrlen); 381 } else 382 statp->nsaddr_list[nserv].sin_family = 0; 383 freeaddrinfo(ai); 384 nserv++; 385 } 386 } 387 continue; 388 } 389#ifdef RESOLVSORT 390 if (MATCH(buf, "sortlist")) { 391 struct in_addr a; 392 struct in6_addr a6; 393 int m, i; 394 u_char *u; 395 struct __res_state_ext *ext = statp->_u._ext.ext; 396 397 cp = buf + sizeof("sortlist") - 1; 398 while (nsort < MAXRESOLVSORT) { 399 while (*cp == ' ' || *cp == '\t') 400 cp++; 401 if (*cp == '\0' || *cp == '\n' || *cp == ';') 402 break; 403 net = cp; 404 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 405 isascii(*cp) && !isspace((unsigned char)*cp)) 406 cp++; 407 n = *cp; 408 *cp = 0; 409 if (inet_aton(net, &a)) { 410 statp->sort_list[nsort].addr = a; 411 if (ISSORTMASK(n)) { 412 *cp++ = n; 413 net = cp; 414 while (*cp && *cp != ';' && 415 isascii(*cp) && 416 !isspace((unsigned char)*cp)) 417 cp++; 418 n = *cp; 419 *cp = 0; 420 if (inet_aton(net, &a)) { 421 statp->sort_list[nsort].mask = a.s_addr; 422 } else { 423 statp->sort_list[nsort].mask = 424 net_mask(statp->sort_list[nsort].addr); 425 } 426 } else { 427 statp->sort_list[nsort].mask = 428 net_mask(statp->sort_list[nsort].addr); 429 } 430 ext->sort_list[nsort].af = AF_INET; 431 ext->sort_list[nsort].addr.ina = 432 statp->sort_list[nsort].addr; 433 ext->sort_list[nsort].mask.ina.s_addr = 434 statp->sort_list[nsort].mask; 435 nsort++; 436 } 437 else if (inet_pton(AF_INET6, net, &a6) == 1) { 438 439 ext->sort_list[nsort].af = AF_INET6; 440 ext->sort_list[nsort].addr.in6a = a6; 441 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 442 *cp++ = n; 443 net = cp; 444 while (*cp && *cp != ';' && 445 isascii(*cp) && !isspace(*cp)) 446 cp++; 447 m = n; 448 n = *cp; 449 *cp = 0; 450 switch (m) { 451 case '/': 452 m = atoi(net); 453 break; 454 case '&': 455 if (inet_pton(AF_INET6, net, u) == 1) { 456 m = -1; 457 break; 458 } 459 /*FALLTHROUGH*/ 460 default: 461 m = sizeof(struct in6_addr) * CHAR_BIT; 462 break; 463 } 464 if (m >= 0) { 465 for (i = 0; i < sizeof(struct in6_addr); i++) { 466 if (m <= 0) { 467 *u = 0; 468 } else { 469 m -= CHAR_BIT; 470 *u = (u_char)~0; 471 if (m < 0) 472 *u <<= -m; 473 } 474 u++; 475 } 476 } 477 statp->sort_list[nsort].addr.s_addr = 478 (u_int32_t)0xffffffff; 479 statp->sort_list[nsort].mask = 480 (u_int32_t)0xffffffff; 481 nsort++; 482 } 483 *cp = n; 484 } 485 continue; 486 } 487#endif 488 if (MATCH(buf, "options")) { 489 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 490 continue; 491 } 492 } 493 if (nserv > 0) 494 statp->nscount = nserv; 495#ifdef RESOLVSORT 496 statp->nsort = nsort; 497#endif 498 (void) fclose(fp); 499 } 500/* 501 * Last chance to get a nameserver. This should not normally 502 * be necessary 503 */ 504#ifdef NO_RESOLV_CONF 505 if(nserv == 0) 506 nserv = get_nameservers(statp); 507#endif 508 509 if (statp->defdname[0] == 0 && 510 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 511 (cp = strchr(buf, '.')) != NULL) 512 strcpy(statp->defdname, cp + 1); 513 514 /* find components of local domain that might be searched */ 515 if (havesearch == 0) { 516 pp = statp->dnsrch; 517 *pp++ = statp->defdname; 518 *pp = NULL; 519 520 dots = 0; 521 for (cp = statp->defdname; *cp; cp++) 522 dots += (*cp == '.'); 523 524 cp = statp->defdname; 525 while (pp < statp->dnsrch + MAXDFLSRCH) { 526 if (dots < LOCALDOMAINPARTS) 527 break; 528 cp = strchr(cp, '.') + 1; /* we know there is one */ 529 *pp++ = cp; 530 dots--; 531 } 532 *pp = NULL; 533#ifdef DEBUG 534 if (statp->options & RES_DEBUG) { 535 printf(";; res_init()... default dnsrch list:\n"); 536 for (pp = statp->dnsrch; *pp; pp++) 537 printf(";;\t%s\n", *pp); 538 printf(";;\t..END..\n"); 539 } 540#endif 541 } 542 543 if (issetugid()) 544 statp->options |= RES_NOALIASES; 545 else if ((cp = getenv("RES_OPTIONS")) != NULL) 546 res_setoptions(statp, cp, "env"); 547 statp->options |= RES_INIT; 548 return (0); 549 550#ifdef SOLARIS2 551 freedata: 552 if (statp->_u._ext.ext != NULL) { 553 free(statp->_u._ext.ext); 554 statp->_u._ext.ext = NULL; 555 } 556 return (-1); 557#endif 558} 559 560static void 561res_setoptions(res_state statp, const char *options, const char *source) 562{ 563 const char *cp = options; 564 int i; 565#ifndef _LIBC 566 struct __res_state_ext *ext = statp->_u._ext.ext; 567#endif 568 569#ifdef DEBUG 570 if (statp->options & RES_DEBUG) 571 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 572 options, source); 573#endif 574 while (*cp) { 575 /* skip leading and inner runs of spaces */ 576 while (*cp == ' ' || *cp == '\t') 577 cp++; 578 /* search for and process individual options */ 579 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 580 i = atoi(cp + sizeof("ndots:") - 1); 581 if (i <= RES_MAXNDOTS) 582 statp->ndots = i; 583 else 584 statp->ndots = RES_MAXNDOTS; 585#ifdef DEBUG 586 if (statp->options & RES_DEBUG) 587 printf(";;\tndots=%d\n", statp->ndots); 588#endif 589 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 590 i = atoi(cp + sizeof("timeout:") - 1); 591 if (i <= RES_MAXRETRANS) 592 statp->retrans = i; 593 else 594 statp->retrans = RES_MAXRETRANS; 595#ifdef DEBUG 596 if (statp->options & RES_DEBUG) 597 printf(";;\ttimeout=%d\n", statp->retrans); 598#endif 599#ifdef SOLARIS2 600 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 601 /* 602 * For backward compatibility, 'retrans' is 603 * supported as an alias for 'timeout', though 604 * without an imposed maximum. 605 */ 606 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 607 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 608 /* 609 * For backward compatibility, 'retry' is 610 * supported as an alias for 'attempts', though 611 * without an imposed maximum. 612 */ 613 statp->retry = atoi(cp + sizeof("retry:") - 1); 614#endif /* SOLARIS2 */ 615 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 616 i = atoi(cp + sizeof("attempts:") - 1); 617 if (i <= RES_MAXRETRY) 618 statp->retry = i; 619 else 620 statp->retry = RES_MAXRETRY; 621#ifdef DEBUG 622 if (statp->options & RES_DEBUG) 623 printf(";;\tattempts=%d\n", statp->retry); 624#endif 625 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 626#ifdef DEBUG 627 if (!(statp->options & RES_DEBUG)) { 628 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 629 options, source); 630 statp->options |= RES_DEBUG; 631 } 632 printf(";;\tdebug\n"); 633#endif 634 } else if (!strncmp(cp, "no_tld_query", 635 sizeof("no_tld_query") - 1) || 636 !strncmp(cp, "no-tld-query", 637 sizeof("no-tld-query") - 1)) { 638 statp->options |= RES_NOTLDQUERY; 639 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 640 statp->options |= RES_USE_INET6; 641 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 642 statp->options |= RES_INSECURE1; 643 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 644 statp->options |= RES_INSECURE2; 645 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 646 statp->options |= RES_ROTATE; 647 } else if (!strncmp(cp, "no-check-names", 648 sizeof("no-check-names") - 1)) { 649 statp->options |= RES_NOCHECKNAME; 650 } 651#ifdef RES_USE_EDNS0 652 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 653 statp->options |= RES_USE_EDNS0; 654 } 655#endif 656#ifndef _LIBC 657 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 658 statp->options |= RES_USE_DNAME; 659 } 660 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 661 if (ext == NULL) 662 goto skip; 663 cp += sizeof("nibble:") - 1; 664 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 665 strncpy(ext->nsuffix, cp, i); 666 ext->nsuffix[i] = '\0'; 667 } 668 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 669 if (ext == NULL) 670 goto skip; 671 cp += sizeof("nibble2:") - 1; 672 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 673 strncpy(ext->nsuffix2, cp, i); 674 ext->nsuffix2[i] = '\0'; 675 } 676 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 677 cp += sizeof("v6revmode:") - 1; 678 /* "nibble" and "bitstring" used to be valid */ 679 if (!strncmp(cp, "single", sizeof("single") - 1)) { 680 statp->options |= RES_NO_NIBBLE2; 681 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 682 statp->options &= 683 ~RES_NO_NIBBLE2; 684 } 685 } 686#endif 687 else { 688 /* XXX - print a warning here? */ 689 } 690#ifndef _LIBC 691 skip: 692#endif 693 /* skip to next run of spaces */ 694 while (*cp && *cp != ' ' && *cp != '\t') 695 cp++; 696 } 697} 698 699#ifdef RESOLVSORT 700/* XXX - should really support CIDR which means explicit masks always. */ 701static u_int32_t 702net_mask(in) /* XXX - should really use system's version of this */ 703 struct in_addr in; 704{ 705 u_int32_t i = ntohl(in.s_addr); 706 707 if (IN_CLASSA(i)) 708 return (htonl(IN_CLASSA_NET)); 709 else if (IN_CLASSB(i)) 710 return (htonl(IN_CLASSB_NET)); 711 return (htonl(IN_CLASSC_NET)); 712} 713#endif 714 715u_int 716res_randomid(void) { 717 struct timeval now; 718 719 gettimeofday(&now, NULL); 720 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 721} 722 723/* 724 * This routine is for closing the socket if a virtual circuit is used and 725 * the program wants to close it. This provides support for endhostent() 726 * which expects to close the socket. 727 * 728 * This routine is not expected to be user visible. 729 */ 730void 731res_nclose(res_state statp) { 732 int ns; 733 734 if (statp->_vcsock >= 0) { 735 (void) _close(statp->_vcsock); 736 statp->_vcsock = -1; 737 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 738 } 739 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 740 if (statp->_u._ext.nssocks[ns] != -1) { 741 (void) _close(statp->_u._ext.nssocks[ns]); 742 statp->_u._ext.nssocks[ns] = -1; 743 } 744 } 745} 746 747void 748res_ndestroy(res_state statp) { 749 res_nclose(statp); 750 if (statp->_u._ext.ext != NULL) 751 free(statp->_u._ext.ext); 752 statp->options &= ~RES_INIT; 753 statp->_u._ext.ext = NULL; 754} 755 756#ifndef _LIBC 757const char * 758res_get_nibblesuffix(res_state statp) { 759 if (statp->_u._ext.ext) 760 return (statp->_u._ext.ext->nsuffix); 761 return ("ip6.arpa"); 762} 763 764const char * 765res_get_nibblesuffix2(res_state statp) { 766 if (statp->_u._ext.ext) 767 return (statp->_u._ext.ext->nsuffix2); 768 return ("ip6.int"); 769} 770#endif 771 772void 773res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 774 int i, nserv; 775 size_t size; 776 777 /* close open servers */ 778 res_nclose(statp); 779 780 /* cause rtt times to be forgotten */ 781 statp->_u._ext.nscount = 0; 782 783 nserv = 0; 784 for (i = 0; i < cnt && nserv < MAXNS; i++) { 785 switch (set->sin.sin_family) { 786 case AF_INET: 787 size = sizeof(set->sin); 788 if (statp->_u._ext.ext) 789 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 790 &set->sin, size); 791 if (size <= sizeof(statp->nsaddr_list[nserv])) 792 memcpy(&statp->nsaddr_list[nserv], 793 &set->sin, size); 794 else 795 statp->nsaddr_list[nserv].sin_family = 0; 796 nserv++; 797 break; 798 799#ifdef HAS_INET6_STRUCTS 800 case AF_INET6: 801 size = sizeof(set->sin6); 802 if (statp->_u._ext.ext) 803 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 804 &set->sin6, size); 805 if (size <= sizeof(statp->nsaddr_list[nserv])) 806 memcpy(&statp->nsaddr_list[nserv], 807 &set->sin6, size); 808 else 809 statp->nsaddr_list[nserv].sin_family = 0; 810 nserv++; 811 break; 812#endif 813 814 default: 815 break; 816 } 817 set++; 818 } 819 statp->nscount = nserv; 820 821} 822 823int 824res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 825 int i; 826 size_t size; 827 u_int16_t family; 828 829 for (i = 0; i < statp->nscount && i < cnt; i++) { 830 if (statp->_u._ext.ext) 831 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 832 else 833 family = statp->nsaddr_list[i].sin_family; 834 835 switch (family) { 836 case AF_INET: 837 size = sizeof(set->sin); 838 if (statp->_u._ext.ext) 839 memcpy(&set->sin, 840 &statp->_u._ext.ext->nsaddrs[i], 841 size); 842 else 843 memcpy(&set->sin, &statp->nsaddr_list[i], 844 size); 845 break; 846 847#ifdef HAS_INET6_STRUCTS 848 case AF_INET6: 849 size = sizeof(set->sin6); 850 if (statp->_u._ext.ext) 851 memcpy(&set->sin6, 852 &statp->_u._ext.ext->nsaddrs[i], 853 size); 854 else 855 memcpy(&set->sin6, &statp->nsaddr_list[i], 856 size); 857 break; 858#endif 859 860 default: 861 set->sin.sin_family = 0; 862 break; 863 } 864 set++; 865 } 866 return (statp->nscount); 867} 868