res_init.c revision 174226
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30/* 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 */ 49 50/* 51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 53 * 54 * Permission to use, copy, modify, and distribute this software for any 55 * purpose with or without fee is hereby granted, provided that the above 56 * copyright notice and this permission notice appear in all copies. 57 * 58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 65 */ 66 67#if defined(LIBC_SCCS) && !defined(lint) 68static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 69static const char rcsid[] = "$Id: res_init.c,v 1.16.18.7 2007/07/09 01:52:58 marka Exp $"; 70#endif /* LIBC_SCCS and not lint */ 71#include <sys/cdefs.h> 72__FBSDID("$FreeBSD: head/lib/libc/resolv/res_init.c 174226 2007-12-03 15:13:44Z ume $"); 73 74#include "port_before.h" 75 76#include "namespace.h" 77 78#include <sys/types.h> 79#include <sys/param.h> 80#include <sys/socket.h> 81#include <sys/time.h> 82 83#include <netinet/in.h> 84#include <arpa/inet.h> 85#include <arpa/nameser.h> 86 87#include <ctype.h> 88#include <stdio.h> 89#include <stdlib.h> 90#include <string.h> 91#include <unistd.h> 92#include <netdb.h> 93 94#include "un-namespace.h" 95 96#include "port_after.h" 97 98/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 99#include <resolv.h> 100 101#include "res_private.h" 102 103/*% Options. Should all be left alone. */ 104#define RESOLVSORT 105#define DEBUG 106 107#ifdef SOLARIS2 108#include <sys/systeminfo.h> 109#endif 110 111static void res_setoptions(res_state, const char *, const char *); 112 113#ifdef RESOLVSORT 114static const char sort_mask[] = "/&"; 115#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 116static u_int32_t net_mask(struct in_addr); 117#endif 118 119#if !defined(isascii) /*%< XXX - could be a function */ 120# define isascii(c) (!(c & 0200)) 121#endif 122 123/* 124 * Resolver state default settings. 125 */ 126 127/*% 128 * Set up default settings. If the configuration file exist, the values 129 * there will have precedence. Otherwise, the server address is set to 130 * INADDR_ANY and the default domain name comes from the gethostname(). 131 * 132 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 133 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 134 * since it was noted that INADDR_ANY actually meant ``the first interface 135 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 136 * it had to be "up" in order for you to reach your own name server. It 137 * was later decided that since the recommended practice is to always 138 * install local static routes through 127.0.0.1 for all your network 139 * interfaces, that we could solve this problem without a code change. 140 * 141 * The configuration file should always be used, since it is the only way 142 * to specify a default domain. If you are running a server on your local 143 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 144 * in the configuration file. 145 * 146 * Return 0 if completes successfully, -1 on error 147 */ 148int 149res_ninit(res_state statp) { 150 extern int __res_vinit(res_state, int); 151 152 return (__res_vinit(statp, 0)); 153} 154 155/*% This function has to be reachable by res_data.c but not publically. */ 156int 157__res_vinit(res_state statp, int preinit) { 158 FILE *fp; 159 char *cp, **pp; 160 int n; 161 char buf[BUFSIZ]; 162 int nserv = 0; /*%< number of nameserver records read from file */ 163 int haveenv = 0; 164 int havesearch = 0; 165#ifdef RESOLVSORT 166 int nsort = 0; 167 char *net; 168#endif 169 int dots; 170 union res_sockaddr_union u[2]; 171 int maxns = MAXNS; 172 173 RES_SET_H_ERRNO(statp, 0); 174 if (statp->_u._ext.ext != NULL) 175 res_ndestroy(statp); 176 177 if (!preinit) { 178 statp->retrans = RES_TIMEOUT; 179 statp->retry = RES_DFLRETRY; 180 statp->options = RES_DEFAULT; 181 statp->id = res_randomid(); 182 } 183 184 memset(u, 0, sizeof(u)); 185#ifdef USELOOPBACK 186 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 187#else 188 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 189#endif 190 u[nserv].sin.sin_family = AF_INET; 191 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 192#ifdef HAVE_SA_LEN 193 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 194#endif 195 nserv++; 196#ifdef HAS_INET6_STRUCTS 197#ifdef USELOOPBACK 198 u[nserv].sin6.sin6_addr = in6addr_loopback; 199#else 200 u[nserv].sin6.sin6_addr = in6addr_any; 201#endif 202 u[nserv].sin6.sin6_family = AF_INET6; 203 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 204#ifdef HAVE_SA_LEN 205 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 206#endif 207 nserv++; 208#endif 209 statp->nscount = 0; 210 statp->ndots = 1; 211 statp->pfcode = 0; 212 statp->_vcsock = -1; 213 statp->_flags = 0; 214 statp->qhook = NULL; 215 statp->rhook = NULL; 216 statp->_u._ext.nscount = 0; 217 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 218 if (statp->_u._ext.ext != NULL) { 219 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 220 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 221 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 222 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 223 } else { 224 /* 225 * Historically res_init() rarely, if at all, failed. 226 * Examples and applications exist which do not check 227 * our return code. Furthermore several applications 228 * simply call us to get the systems domainname. So 229 * rather then immediately fail here we store the 230 * failure, which is returned later, in h_errno. And 231 * prevent the collection of 'nameserver' information 232 * by setting maxns to 0. Thus applications that fail 233 * to check our return code wont be able to make 234 * queries anyhow. 235 */ 236 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 237 maxns = 0; 238 } 239#ifdef RESOLVSORT 240 statp->nsort = 0; 241#endif 242 res_setservers(statp, u, nserv); 243 244#ifdef SOLARIS2 245 /* 246 * The old libresolv derived the defaultdomain from NIS/NIS+. 247 * We want to keep this behaviour 248 */ 249 { 250 char buf[sizeof(statp->defdname)], *cp; 251 int ret; 252 253 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 254 (unsigned int)ret <= sizeof(buf)) { 255 if (buf[0] == '+') 256 buf[0] = '.'; 257 cp = strchr(buf, '.'); 258 cp = (cp == NULL) ? buf : (cp + 1); 259 strncpy(statp->defdname, cp, 260 sizeof(statp->defdname) - 1); 261 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 262 } 263 } 264#endif /* SOLARIS2 */ 265 266 /* Allow user to override the local domain definition */ 267 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 268 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 269 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 270 haveenv++; 271 272 /* 273 * Set search list to be blank-separated strings 274 * from rest of env value. Permits users of LOCALDOMAIN 275 * to still have a search list, and anyone to set the 276 * one that they want to use as an individual (even more 277 * important now that the rfc1535 stuff restricts searches) 278 */ 279 cp = statp->defdname; 280 pp = statp->dnsrch; 281 *pp++ = cp; 282 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 283 if (*cp == '\n') /*%< silly backwards compat */ 284 break; 285 else if (*cp == ' ' || *cp == '\t') { 286 *cp = 0; 287 n = 1; 288 } else if (n) { 289 *pp++ = cp; 290 n = 0; 291 havesearch = 1; 292 } 293 } 294 /* null terminate last domain if there are excess */ 295 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 296 cp++; 297 *cp = '\0'; 298 *pp++ = 0; 299 } 300 301#define MATCH(line, name) \ 302 (!strncmp(line, name, sizeof(name) - 1) && \ 303 (line[sizeof(name) - 1] == ' ' || \ 304 line[sizeof(name) - 1] == '\t')) 305 306 nserv = 0; 307 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 308 /* read the config file */ 309 while (fgets(buf, sizeof(buf), fp) != NULL) { 310 /* skip comments */ 311 if (*buf == ';' || *buf == '#') 312 continue; 313 /* read default domain name */ 314 if (MATCH(buf, "domain")) { 315 if (haveenv) /*%< skip if have from environ */ 316 continue; 317 cp = buf + sizeof("domain") - 1; 318 while (*cp == ' ' || *cp == '\t') 319 cp++; 320 if ((*cp == '\0') || (*cp == '\n')) 321 continue; 322 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 323 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 324 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 325 *cp = '\0'; 326 havesearch = 0; 327 continue; 328 } 329 /* set search list */ 330 if (MATCH(buf, "search")) { 331 if (haveenv) /*%< skip if have from environ */ 332 continue; 333 cp = buf + sizeof("search") - 1; 334 while (*cp == ' ' || *cp == '\t') 335 cp++; 336 if ((*cp == '\0') || (*cp == '\n')) 337 continue; 338 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 339 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 340 if ((cp = strchr(statp->defdname, '\n')) != NULL) 341 *cp = '\0'; 342 /* 343 * Set search list to be blank-separated strings 344 * on rest of line. 345 */ 346 cp = statp->defdname; 347 pp = statp->dnsrch; 348 *pp++ = cp; 349 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 350 if (*cp == ' ' || *cp == '\t') { 351 *cp = 0; 352 n = 1; 353 } else if (n) { 354 *pp++ = cp; 355 n = 0; 356 } 357 } 358 /* null terminate last domain if there are excess */ 359 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 360 cp++; 361 *cp = '\0'; 362 *pp++ = 0; 363 havesearch = 1; 364 continue; 365 } 366 /* read nameservers to query */ 367 if (MATCH(buf, "nameserver") && nserv < maxns) { 368 struct addrinfo hints, *ai; 369 char sbuf[NI_MAXSERV]; 370 const size_t minsiz = 371 sizeof(statp->_u._ext.ext->nsaddrs[0]); 372 373 cp = buf + sizeof("nameserver") - 1; 374 while (*cp == ' ' || *cp == '\t') 375 cp++; 376 cp[strcspn(cp, ";# \t\n")] = '\0'; 377 if ((*cp != '\0') && (*cp != '\n')) { 378 memset(&hints, 0, sizeof(hints)); 379 hints.ai_family = PF_UNSPEC; 380 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 381 hints.ai_flags = AI_NUMERICHOST; 382 sprintf(sbuf, "%u", NAMESERVER_PORT); 383 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 384 ai->ai_addrlen <= minsiz) { 385 if (statp->_u._ext.ext != NULL) { 386 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 387 ai->ai_addr, ai->ai_addrlen); 388 } 389 if (ai->ai_addrlen <= 390 sizeof(statp->nsaddr_list[nserv])) { 391 memcpy(&statp->nsaddr_list[nserv], 392 ai->ai_addr, ai->ai_addrlen); 393 } else 394 statp->nsaddr_list[nserv].sin_family = 0; 395 freeaddrinfo(ai); 396 nserv++; 397 } 398 } 399 continue; 400 } 401#ifdef RESOLVSORT 402 if (MATCH(buf, "sortlist")) { 403 struct in_addr a; 404 struct in6_addr a6; 405 int m, i; 406 u_char *u; 407 struct __res_state_ext *ext = statp->_u._ext.ext; 408 409 cp = buf + sizeof("sortlist") - 1; 410 while (nsort < MAXRESOLVSORT) { 411 while (*cp == ' ' || *cp == '\t') 412 cp++; 413 if (*cp == '\0' || *cp == '\n' || *cp == ';') 414 break; 415 net = cp; 416 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 417 isascii(*cp) && !isspace((unsigned char)*cp)) 418 cp++; 419 n = *cp; 420 *cp = 0; 421 if (inet_aton(net, &a)) { 422 statp->sort_list[nsort].addr = a; 423 if (ISSORTMASK(n)) { 424 *cp++ = n; 425 net = cp; 426 while (*cp && *cp != ';' && 427 isascii(*cp) && 428 !isspace((unsigned char)*cp)) 429 cp++; 430 n = *cp; 431 *cp = 0; 432 if (inet_aton(net, &a)) { 433 statp->sort_list[nsort].mask = a.s_addr; 434 } else { 435 statp->sort_list[nsort].mask = 436 net_mask(statp->sort_list[nsort].addr); 437 } 438 } else { 439 statp->sort_list[nsort].mask = 440 net_mask(statp->sort_list[nsort].addr); 441 } 442 ext->sort_list[nsort].af = AF_INET; 443 ext->sort_list[nsort].addr.ina = 444 statp->sort_list[nsort].addr; 445 ext->sort_list[nsort].mask.ina.s_addr = 446 statp->sort_list[nsort].mask; 447 nsort++; 448 } 449 else if (inet_pton(AF_INET6, net, &a6) == 1) { 450 451 ext->sort_list[nsort].af = AF_INET6; 452 ext->sort_list[nsort].addr.in6a = a6; 453 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 454 *cp++ = n; 455 net = cp; 456 while (*cp && *cp != ';' && 457 isascii(*cp) && !isspace(*cp)) 458 cp++; 459 m = n; 460 n = *cp; 461 *cp = 0; 462 switch (m) { 463 case '/': 464 m = atoi(net); 465 break; 466 case '&': 467 if (inet_pton(AF_INET6, net, u) == 1) { 468 m = -1; 469 break; 470 } 471 /*FALLTHROUGH*/ 472 default: 473 m = sizeof(struct in6_addr) * CHAR_BIT; 474 break; 475 } 476 if (m >= 0) { 477 for (i = 0; i < sizeof(struct in6_addr); i++) { 478 if (m <= 0) { 479 *u = 0; 480 } else { 481 m -= CHAR_BIT; 482 *u = (u_char)~0; 483 if (m < 0) 484 *u <<= -m; 485 } 486 u++; 487 } 488 } 489 statp->sort_list[nsort].addr.s_addr = 490 (u_int32_t)0xffffffff; 491 statp->sort_list[nsort].mask = 492 (u_int32_t)0xffffffff; 493 nsort++; 494 } 495 *cp = n; 496 } 497 continue; 498 } 499#endif 500 if (MATCH(buf, "options")) { 501 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 502 continue; 503 } 504 } 505 if (nserv > 0) 506 statp->nscount = nserv; 507#ifdef RESOLVSORT 508 statp->nsort = nsort; 509#endif 510 (void) fclose(fp); 511 } 512/* 513 * Last chance to get a nameserver. This should not normally 514 * be necessary 515 */ 516#ifdef NO_RESOLV_CONF 517 if(nserv == 0) 518 nserv = get_nameservers(statp); 519#endif 520 521 if (statp->defdname[0] == 0 && 522 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 523 (cp = strchr(buf, '.')) != NULL) 524 strcpy(statp->defdname, cp + 1); 525 526 /* find components of local domain that might be searched */ 527 if (havesearch == 0) { 528 pp = statp->dnsrch; 529 *pp++ = statp->defdname; 530 *pp = NULL; 531 532 dots = 0; 533 for (cp = statp->defdname; *cp; cp++) 534 dots += (*cp == '.'); 535 536 cp = statp->defdname; 537 while (pp < statp->dnsrch + MAXDFLSRCH) { 538 if (dots < LOCALDOMAINPARTS) 539 break; 540 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 541 *pp++ = cp; 542 dots--; 543 } 544 *pp = NULL; 545#ifdef DEBUG 546 if (statp->options & RES_DEBUG) { 547 printf(";; res_init()... default dnsrch list:\n"); 548 for (pp = statp->dnsrch; *pp; pp++) 549 printf(";;\t%s\n", *pp); 550 printf(";;\t..END..\n"); 551 } 552#endif 553 } 554 555 if (issetugid()) 556 statp->options |= RES_NOALIASES; 557 else if ((cp = getenv("RES_OPTIONS")) != NULL) 558 res_setoptions(statp, cp, "env"); 559 statp->options |= RES_INIT; 560 return (statp->res_h_errno); 561} 562 563static void 564res_setoptions(res_state statp, const char *options, const char *source) 565{ 566 const char *cp = options; 567 int i; 568#ifndef _LIBC 569 struct __res_state_ext *ext = statp->_u._ext.ext; 570#endif 571 572#ifdef DEBUG 573 if (statp->options & RES_DEBUG) 574 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 575 options, source); 576#endif 577 while (*cp) { 578 /* skip leading and inner runs of spaces */ 579 while (*cp == ' ' || *cp == '\t') 580 cp++; 581 /* search for and process individual options */ 582 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 583 i = atoi(cp + sizeof("ndots:") - 1); 584 if (i <= RES_MAXNDOTS) 585 statp->ndots = i; 586 else 587 statp->ndots = RES_MAXNDOTS; 588#ifdef DEBUG 589 if (statp->options & RES_DEBUG) 590 printf(";;\tndots=%d\n", statp->ndots); 591#endif 592 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 593 i = atoi(cp + sizeof("timeout:") - 1); 594 if (i <= RES_MAXRETRANS) 595 statp->retrans = i; 596 else 597 statp->retrans = RES_MAXRETRANS; 598#ifdef DEBUG 599 if (statp->options & RES_DEBUG) 600 printf(";;\ttimeout=%d\n", statp->retrans); 601#endif 602#ifdef SOLARIS2 603 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 604 /* 605 * For backward compatibility, 'retrans' is 606 * supported as an alias for 'timeout', though 607 * without an imposed maximum. 608 */ 609 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 610 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 611 /* 612 * For backward compatibility, 'retry' is 613 * supported as an alias for 'attempts', though 614 * without an imposed maximum. 615 */ 616 statp->retry = atoi(cp + sizeof("retry:") - 1); 617#endif /* SOLARIS2 */ 618 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 619 i = atoi(cp + sizeof("attempts:") - 1); 620 if (i <= RES_MAXRETRY) 621 statp->retry = i; 622 else 623 statp->retry = RES_MAXRETRY; 624#ifdef DEBUG 625 if (statp->options & RES_DEBUG) 626 printf(";;\tattempts=%d\n", statp->retry); 627#endif 628 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 629#ifdef DEBUG 630 if (!(statp->options & RES_DEBUG)) { 631 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 632 options, source); 633 statp->options |= RES_DEBUG; 634 } 635 printf(";;\tdebug\n"); 636#endif 637 } else if (!strncmp(cp, "no_tld_query", 638 sizeof("no_tld_query") - 1) || 639 !strncmp(cp, "no-tld-query", 640 sizeof("no-tld-query") - 1)) { 641 statp->options |= RES_NOTLDQUERY; 642 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 643 statp->options |= RES_USE_INET6; 644 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 645 statp->options |= RES_INSECURE1; 646 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 647 statp->options |= RES_INSECURE2; 648 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 649 statp->options |= RES_ROTATE; 650 } else if (!strncmp(cp, "no-check-names", 651 sizeof("no-check-names") - 1)) { 652 statp->options |= RES_NOCHECKNAME; 653 } 654#ifdef RES_USE_EDNS0 655 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 656 statp->options |= RES_USE_EDNS0; 657 } 658#endif 659#ifndef _LIBC 660 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 661 statp->options |= RES_USE_DNAME; 662 } 663 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 664 if (ext == NULL) 665 goto skip; 666 cp += sizeof("nibble:") - 1; 667 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 668 strncpy(ext->nsuffix, cp, i); 669 ext->nsuffix[i] = '\0'; 670 } 671 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 672 if (ext == NULL) 673 goto skip; 674 cp += sizeof("nibble2:") - 1; 675 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 676 strncpy(ext->nsuffix2, cp, i); 677 ext->nsuffix2[i] = '\0'; 678 } 679 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 680 cp += sizeof("v6revmode:") - 1; 681 /* "nibble" and "bitstring" used to be valid */ 682 if (!strncmp(cp, "single", sizeof("single") - 1)) { 683 statp->options |= RES_NO_NIBBLE2; 684 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 685 statp->options &= 686 ~RES_NO_NIBBLE2; 687 } 688 } 689#endif 690 else { 691 /* XXX - print a warning here? */ 692 } 693#ifndef _LIBC 694 skip: 695#endif 696 /* skip to next run of spaces */ 697 while (*cp && *cp != ' ' && *cp != '\t') 698 cp++; 699 } 700} 701 702#ifdef RESOLVSORT 703/* XXX - should really support CIDR which means explicit masks always. */ 704static u_int32_t 705net_mask(in) /*!< XXX - should really use system's version of this */ 706 struct in_addr in; 707{ 708 u_int32_t i = ntohl(in.s_addr); 709 710 if (IN_CLASSA(i)) 711 return (htonl(IN_CLASSA_NET)); 712 else if (IN_CLASSB(i)) 713 return (htonl(IN_CLASSB_NET)); 714 return (htonl(IN_CLASSC_NET)); 715} 716#endif 717 718u_int 719res_randomid(void) { 720 struct timeval now; 721 722 gettimeofday(&now, NULL); 723 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 724} 725 726/*% 727 * This routine is for closing the socket if a virtual circuit is used and 728 * the program wants to close it. This provides support for endhostent() 729 * which expects to close the socket. 730 * 731 * This routine is not expected to be user visible. 732 */ 733void 734res_nclose(res_state statp) { 735 int ns; 736 737 if (statp->_vcsock >= 0) { 738 (void) _close(statp->_vcsock); 739 statp->_vcsock = -1; 740 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 741 } 742 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 743 if (statp->_u._ext.nssocks[ns] != -1) { 744 (void) _close(statp->_u._ext.nssocks[ns]); 745 statp->_u._ext.nssocks[ns] = -1; 746 } 747 } 748} 749 750void 751res_ndestroy(res_state statp) { 752 res_nclose(statp); 753 if (statp->_u._ext.ext != NULL) 754 free(statp->_u._ext.ext); 755 statp->options &= ~RES_INIT; 756 statp->_u._ext.ext = NULL; 757} 758 759#ifndef _LIBC 760const char * 761res_get_nibblesuffix(res_state statp) { 762 if (statp->_u._ext.ext) 763 return (statp->_u._ext.ext->nsuffix); 764 return ("ip6.arpa"); 765} 766 767const char * 768res_get_nibblesuffix2(res_state statp) { 769 if (statp->_u._ext.ext) 770 return (statp->_u._ext.ext->nsuffix2); 771 return ("ip6.int"); 772} 773#endif 774 775void 776res_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 826int 827res_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