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) 68 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 69 static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $"; 70 #endif /* LIBC_SCCS and not lint */ 71 #include <sys/cdefs.h> 72 __FBSDID("$FreeBSD$"); 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 #ifndef HAVE_MD5 95 # include "../dst/md5.h" 96 #else 97 # ifdef SOLARIS2 98 # include <sys/md5.h> 99 # elif _LIBC 100 # include <md5.h> 101 # endif 102 #endif 103 #ifndef _MD5_H_ 104 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 105 #endif 106 107 #include "un-namespace.h" 108 109 #include "port_after.h" 110 111 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 112 #include <resolv.h> 113 114 #include "res_private.h" 115 116 /*% Options. Should all be left alone. */ 117 #define RESOLVSORT 118 #define DEBUG 119 120 #ifdef SOLARIS2 121 #include <sys/systeminfo.h> 122 #endif 123 124 static void res_setoptions(res_state, const char *, const char *); 125 126 #ifdef RESOLVSORT 127 static const char sort_mask[] = "/&"; 128 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 129 static u_int32_t net_mask(struct in_addr); 130 #endif 131 132 #if !defined(isascii) /*%< XXX - could be a function */ 133 # define isascii(c) (!(c & 0200)) 134 #endif 135 136 /* 137 * Resolver state default settings. 138 */ 139 140 /*% 141 * Set up default settings. If the configuration file exist, the values 142 * there will have precedence. Otherwise, the server address is set to 143 * INADDR_ANY and the default domain name comes from the gethostname(). 144 * 145 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 146 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 147 * since it was noted that INADDR_ANY actually meant ``the first interface 148 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 149 * it had to be "up" in order for you to reach your own name server. It 150 * was later decided that since the recommended practice is to always 151 * install local static routes through 127.0.0.1 for all your network 152 * interfaces, that we could solve this problem without a code change. 153 * 154 * The configuration file should always be used, since it is the only way 155 * to specify a default domain. If you are running a server on your local 156 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 157 * in the configuration file. 158 * 159 * Return 0 if completes successfully, -1 on error 160 */ 161 int 162 res_ninit(res_state statp) { 163 extern int __res_vinit(res_state, int); 164 165 return (__res_vinit(statp, 0)); 166 } 167 168 /*% This function has to be reachable by res_data.c but not publically. */ 169 int 170 __res_vinit(res_state statp, int preinit) { 171 FILE *fp; 172 char *cp, **pp; 173 int n; 174 char buf[BUFSIZ]; 175 int nserv = 0; /*%< number of nameserver records read from file */ 176 int haveenv = 0; 177 int havesearch = 0; 178 #ifdef RESOLVSORT 179 int nsort = 0; 180 char *net; 181 #endif 182 int dots; 183 union res_sockaddr_union u[2]; 184 int maxns = MAXNS; 185 186 RES_SET_H_ERRNO(statp, 0); 187 if (statp->_u._ext.ext != NULL) 188 res_ndestroy(statp); 189 190 if (!preinit) { 191 statp->retrans = RES_TIMEOUT; 192 statp->retry = RES_DFLRETRY; 193 statp->options = RES_DEFAULT; 194 } 195 196 statp->_rnd = malloc(16); 197 res_rndinit(statp); 198 statp->id = res_nrandomid(statp); 199 200 memset(u, 0, sizeof(u)); 201 #ifdef USELOOPBACK 202 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 203 #else 204 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 205 #endif 206 u[nserv].sin.sin_family = AF_INET; 207 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 208 #ifdef HAVE_SA_LEN 209 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 210 #endif 211 nserv++; 212 #ifdef HAS_INET6_STRUCTS 213 #ifdef USELOOPBACK 214 u[nserv].sin6.sin6_addr = in6addr_loopback; 215 #else 216 u[nserv].sin6.sin6_addr = in6addr_any; 217 #endif 218 u[nserv].sin6.sin6_family = AF_INET6; 219 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 220 #ifdef HAVE_SA_LEN 221 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 222 #endif 223 nserv++; 224 #endif 225 statp->nscount = 0; 226 statp->ndots = 1; 227 statp->pfcode = 0; 228 statp->_vcsock = -1; 229 statp->_flags = 0; 230 statp->qhook = NULL; 231 statp->rhook = NULL; 232 statp->_u._ext.nscount = 0; 233 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 234 if (statp->_u._ext.ext != NULL) { 235 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 236 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 237 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 238 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 239 } else { 240 /* 241 * Historically res_init() rarely, if at all, failed. 242 * Examples and applications exist which do not check 243 * our return code. Furthermore several applications 244 * simply call us to get the systems domainname. So 245 * rather then immediately fail here we store the 246 * failure, which is returned later, in h_errno. And 247 * prevent the collection of 'nameserver' information 248 * by setting maxns to 0. Thus applications that fail 249 * to check our return code wont be able to make 250 * queries anyhow. 251 */ 252 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 253 maxns = 0; 254 } 255 #ifdef RESOLVSORT 256 statp->nsort = 0; 257 #endif 258 res_setservers(statp, u, nserv); 259 260 #ifdef SOLARIS2 261 /* 262 * The old libresolv derived the defaultdomain from NIS/NIS+. 263 * We want to keep this behaviour 264 */ 265 { 266 char buf[sizeof(statp->defdname)], *cp; 267 int ret; 268 269 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 270 (unsigned int)ret <= sizeof(buf)) { 271 if (buf[0] == '+') 272 buf[0] = '.'; 273 cp = strchr(buf, '.'); 274 cp = (cp == NULL) ? buf : (cp + 1); 275 strncpy(statp->defdname, cp, 276 sizeof(statp->defdname) - 1); 277 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 278 } 279 } 280 #endif /* SOLARIS2 */ 281 282 /* Allow user to override the local domain definition */ 283 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 284 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 285 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 286 haveenv++; 287 288 /* 289 * Set search list to be blank-separated strings 290 * from rest of env value. Permits users of LOCALDOMAIN 291 * to still have a search list, and anyone to set the 292 * one that they want to use as an individual (even more 293 * important now that the rfc1535 stuff restricts searches) 294 */ 295 cp = statp->defdname; 296 pp = statp->dnsrch; 297 *pp++ = cp; 298 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 299 if (*cp == '\n') /*%< silly backwards compat */ 300 break; 301 else if (*cp == ' ' || *cp == '\t') { 302 *cp = 0; 303 n = 1; 304 } else if (n) { 305 *pp++ = cp; 306 n = 0; 307 havesearch = 1; 308 } 309 } 310 /* null terminate last domain if there are excess */ 311 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 312 cp++; 313 *cp = '\0'; 314 *pp++ = 0; 315 } 316 317 #define MATCH(line, name) \ 318 (!strncmp(line, name, sizeof(name) - 1) && \ 319 (line[sizeof(name) - 1] == ' ' || \ 320 line[sizeof(name) - 1] == '\t')) 321 322 nserv = 0; 323 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 324 /* read the config file */ 325 while (fgets(buf, sizeof(buf), fp) != NULL) { 326 /* skip comments */ 327 if (*buf == ';' || *buf == '#') 328 continue; 329 /* read default domain name */ 330 if (MATCH(buf, "domain")) { 331 if (haveenv) /*%< skip if have from environ */ 332 continue; 333 cp = buf + sizeof("domain") - 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 = strpbrk(statp->defdname, " \t\n")) != NULL) 341 *cp = '\0'; 342 havesearch = 0; 343 continue; 344 } 345 /* set search list */ 346 if (MATCH(buf, "search")) { 347 if (haveenv) /*%< skip if have from environ */ 348 continue; 349 cp = buf + sizeof("search") - 1; 350 while (*cp == ' ' || *cp == '\t') 351 cp++; 352 if ((*cp == '\0') || (*cp == '\n')) 353 continue; 354 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 355 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 356 if ((cp = strchr(statp->defdname, '\n')) != NULL) 357 *cp = '\0'; 358 /* 359 * Set search list to be blank-separated strings 360 * on rest of line. 361 */ 362 cp = statp->defdname; 363 pp = statp->dnsrch; 364 *pp++ = cp; 365 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 366 if (*cp == ' ' || *cp == '\t') { 367 *cp = 0; 368 n = 1; 369 } else if (n) { 370 *pp++ = cp; 371 n = 0; 372 } 373 } 374 /* null terminate last domain if there are excess */ 375 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 376 cp++; 377 *cp = '\0'; 378 *pp++ = 0; 379 havesearch = 1; 380 continue; 381 } 382 /* read nameservers to query */ 383 if (MATCH(buf, "nameserver") && nserv < maxns) { 384 struct addrinfo hints, *ai; 385 char sbuf[NI_MAXSERV]; 386 const size_t minsiz = 387 sizeof(statp->_u._ext.ext->nsaddrs[0]); 388 389 cp = buf + sizeof("nameserver") - 1; 390 while (*cp == ' ' || *cp == '\t') 391 cp++; 392 cp[strcspn(cp, ";# \t\n")] = '\0'; 393 if ((*cp != '\0') && (*cp != '\n')) { 394 memset(&hints, 0, sizeof(hints)); 395 hints.ai_family = PF_UNSPEC; 396 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 397 hints.ai_flags = AI_NUMERICHOST; 398 sprintf(sbuf, "%u", NAMESERVER_PORT); 399 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 400 ai->ai_addrlen <= minsiz) { 401 if (statp->_u._ext.ext != NULL) { 402 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 403 ai->ai_addr, ai->ai_addrlen); 404 } 405 if (ai->ai_addrlen <= 406 sizeof(statp->nsaddr_list[nserv])) { 407 memcpy(&statp->nsaddr_list[nserv], 408 ai->ai_addr, ai->ai_addrlen); 409 } else 410 statp->nsaddr_list[nserv].sin_family = 0; 411 freeaddrinfo(ai); 412 nserv++; 413 } 414 } 415 continue; 416 } 417 #ifdef RESOLVSORT 418 if (MATCH(buf, "sortlist")) { 419 struct in_addr a; 420 struct in6_addr a6; 421 int m, i; 422 u_char *u; 423 struct __res_state_ext *ext = statp->_u._ext.ext; 424 425 cp = buf + sizeof("sortlist") - 1; 426 while (nsort < MAXRESOLVSORT) { 427 while (*cp == ' ' || *cp == '\t') 428 cp++; 429 if (*cp == '\0' || *cp == '\n' || *cp == ';') 430 break; 431 net = cp; 432 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 433 isascii(*cp) && !isspace((unsigned char)*cp)) 434 cp++; 435 n = *cp; 436 *cp = 0; 437 if (inet_aton(net, &a)) { 438 statp->sort_list[nsort].addr = a; 439 if (ISSORTMASK(n)) { 440 *cp++ = n; 441 net = cp; 442 while (*cp && *cp != ';' && 443 isascii(*cp) && 444 !isspace((unsigned char)*cp)) 445 cp++; 446 n = *cp; 447 *cp = 0; 448 if (inet_aton(net, &a)) { 449 statp->sort_list[nsort].mask = a.s_addr; 450 } else { 451 statp->sort_list[nsort].mask = 452 net_mask(statp->sort_list[nsort].addr); 453 } 454 } else { 455 statp->sort_list[nsort].mask = 456 net_mask(statp->sort_list[nsort].addr); 457 } 458 ext->sort_list[nsort].af = AF_INET; 459 ext->sort_list[nsort].addr.ina = 460 statp->sort_list[nsort].addr; 461 ext->sort_list[nsort].mask.ina.s_addr = 462 statp->sort_list[nsort].mask; 463 nsort++; 464 } 465 else if (inet_pton(AF_INET6, net, &a6) == 1) { 466 467 ext->sort_list[nsort].af = AF_INET6; 468 ext->sort_list[nsort].addr.in6a = a6; 469 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 470 *cp++ = n; 471 net = cp; 472 while (*cp && *cp != ';' && 473 isascii(*cp) && !isspace(*cp)) 474 cp++; 475 m = n; 476 n = *cp; 477 *cp = 0; 478 switch (m) { 479 case '/': 480 m = atoi(net); 481 break; 482 case '&': 483 if (inet_pton(AF_INET6, net, u) == 1) { 484 m = -1; 485 break; 486 } 487 /*FALLTHROUGH*/ 488 default: 489 m = sizeof(struct in6_addr) * CHAR_BIT; 490 break; 491 } 492 if (m >= 0) { 493 for (i = 0; i < sizeof(struct in6_addr); i++) { 494 if (m <= 0) { 495 *u = 0; 496 } else { 497 m -= CHAR_BIT; 498 *u = (u_char)~0; 499 if (m < 0) 500 *u <<= -m; 501 } 502 u++; 503 } 504 } 505 statp->sort_list[nsort].addr.s_addr = 506 (u_int32_t)0xffffffff; 507 statp->sort_list[nsort].mask = 508 (u_int32_t)0xffffffff; 509 nsort++; 510 } 511 *cp = n; 512 } 513 continue; 514 } 515 #endif 516 if (MATCH(buf, "options")) { 517 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 518 continue; 519 } 520 } 521 if (nserv > 0) 522 statp->nscount = nserv; 523 #ifdef RESOLVSORT 524 statp->nsort = nsort; 525 #endif 526 (void) fclose(fp); 527 } 528 /* 529 * Last chance to get a nameserver. This should not normally 530 * be necessary 531 */ 532 #ifdef NO_RESOLV_CONF 533 if(nserv == 0) 534 nserv = get_nameservers(statp); 535 #endif 536 537 if (statp->defdname[0] == 0 && 538 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 539 (cp = strchr(buf, '.')) != NULL) 540 strcpy(statp->defdname, cp + 1); 541 542 /* find components of local domain that might be searched */ 543 if (havesearch == 0) { 544 pp = statp->dnsrch; 545 *pp++ = statp->defdname; 546 *pp = NULL; 547 548 dots = 0; 549 for (cp = statp->defdname; *cp; cp++) 550 dots += (*cp == '.'); 551 552 cp = statp->defdname; 553 while (pp < statp->dnsrch + MAXDFLSRCH) { 554 if (dots < LOCALDOMAINPARTS) 555 break; 556 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 557 *pp++ = cp; 558 dots--; 559 } 560 *pp = NULL; 561 #ifdef DEBUG 562 if (statp->options & RES_DEBUG) { 563 printf(";; res_init()... default dnsrch list:\n"); 564 for (pp = statp->dnsrch; *pp; pp++) 565 printf(";;\t%s\n", *pp); 566 printf(";;\t..END..\n"); 567 } 568 #endif 569 } 570 571 if (issetugid()) 572 statp->options |= RES_NOALIASES; 573 else if ((cp = getenv("RES_OPTIONS")) != NULL) 574 res_setoptions(statp, cp, "env"); 575 statp->options |= RES_INIT; 576 return (statp->res_h_errno); 577 } 578 579 static void 580 res_setoptions(res_state statp, const char *options, const char *source) 581 { 582 const char *cp = options; 583 int i; 584 #ifndef _LIBC 585 struct __res_state_ext *ext = statp->_u._ext.ext; 586 #endif 587 588 #ifdef DEBUG 589 if (statp->options & RES_DEBUG) 590 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 591 options, source); 592 #endif 593 while (*cp) { 594 /* skip leading and inner runs of spaces */ 595 while (*cp == ' ' || *cp == '\t') 596 cp++; 597 /* search for and process individual options */ 598 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 599 i = atoi(cp + sizeof("ndots:") - 1); 600 if (i <= RES_MAXNDOTS) 601 statp->ndots = i; 602 else 603 statp->ndots = RES_MAXNDOTS; 604 #ifdef DEBUG 605 if (statp->options & RES_DEBUG) 606 printf(";;\tndots=%d\n", statp->ndots); 607 #endif 608 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 609 i = atoi(cp + sizeof("timeout:") - 1); 610 if (i <= RES_MAXRETRANS) 611 statp->retrans = i; 612 else 613 statp->retrans = RES_MAXRETRANS; 614 #ifdef DEBUG 615 if (statp->options & RES_DEBUG) 616 printf(";;\ttimeout=%d\n", statp->retrans); 617 #endif 618 #ifdef SOLARIS2 619 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 620 /* 621 * For backward compatibility, 'retrans' is 622 * supported as an alias for 'timeout', though 623 * without an imposed maximum. 624 */ 625 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 626 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 627 /* 628 * For backward compatibility, 'retry' is 629 * supported as an alias for 'attempts', though 630 * without an imposed maximum. 631 */ 632 statp->retry = atoi(cp + sizeof("retry:") - 1); 633 #endif /* SOLARIS2 */ 634 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 635 i = atoi(cp + sizeof("attempts:") - 1); 636 if (i <= RES_MAXRETRY) 637 statp->retry = i; 638 else 639 statp->retry = RES_MAXRETRY; 640 #ifdef DEBUG 641 if (statp->options & RES_DEBUG) 642 printf(";;\tattempts=%d\n", statp->retry); 643 #endif 644 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 645 #ifdef DEBUG 646 if (!(statp->options & RES_DEBUG)) { 647 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 648 options, source); 649 statp->options |= RES_DEBUG; 650 } 651 printf(";;\tdebug\n"); 652 #endif 653 } else if (!strncmp(cp, "no_tld_query", 654 sizeof("no_tld_query") - 1) || 655 !strncmp(cp, "no-tld-query", 656 sizeof("no-tld-query") - 1)) { 657 statp->options |= RES_NOTLDQUERY; 658 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 659 statp->options |= RES_USE_INET6; 660 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 661 statp->options |= RES_INSECURE1; 662 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 663 statp->options |= RES_INSECURE2; 664 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 665 statp->options |= RES_ROTATE; 666 } else if (!strncmp(cp, "no-check-names", 667 sizeof("no-check-names") - 1)) { 668 statp->options |= RES_NOCHECKNAME; 669 } 670 #ifdef RES_USE_EDNS0 671 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 672 statp->options |= RES_USE_EDNS0; 673 } 674 #endif 675 #ifndef _LIBC 676 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 677 statp->options |= RES_USE_DNAME; 678 } 679 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 680 if (ext == NULL) 681 goto skip; 682 cp += sizeof("nibble:") - 1; 683 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 684 strncpy(ext->nsuffix, cp, i); 685 ext->nsuffix[i] = '\0'; 686 } 687 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 688 if (ext == NULL) 689 goto skip; 690 cp += sizeof("nibble2:") - 1; 691 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 692 strncpy(ext->nsuffix2, cp, i); 693 ext->nsuffix2[i] = '\0'; 694 } 695 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 696 cp += sizeof("v6revmode:") - 1; 697 /* "nibble" and "bitstring" used to be valid */ 698 if (!strncmp(cp, "single", sizeof("single") - 1)) { 699 statp->options |= RES_NO_NIBBLE2; 700 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 701 statp->options &= 702 ~RES_NO_NIBBLE2; 703 } 704 } 705 #endif 706 else { 707 /* XXX - print a warning here? */ 708 } 709 #ifndef _LIBC 710 skip: 711 #endif 712 /* skip to next run of spaces */ 713 while (*cp && *cp != ' ' && *cp != '\t') 714 cp++; 715 } 716 } 717 718 #ifdef RESOLVSORT 719 /* XXX - should really support CIDR which means explicit masks always. */ 720 static u_int32_t 721 net_mask(in) /*!< XXX - should really use system's version of this */ 722 struct in_addr in; 723 { 724 u_int32_t i = ntohl(in.s_addr); 725 726 if (IN_CLASSA(i)) 727 return (htonl(IN_CLASSA_NET)); 728 else if (IN_CLASSB(i)) 729 return (htonl(IN_CLASSB_NET)); 730 return (htonl(IN_CLASSC_NET)); 731 } 732 #endif 733 734 static u_char srnd[16]; 735 736 void 737 res_rndinit(res_state statp) 738 { 739 struct timeval now; 740 u_int32_t u32; 741 u_int16_t u16; 742 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 743 744 gettimeofday(&now, NULL); 745 u32 = now.tv_sec; 746 memcpy(rnd, &u32, 4); 747 u32 = now.tv_usec; 748 memcpy(rnd + 4, &u32, 4); 749 u32 += now.tv_sec; 750 memcpy(rnd + 8, &u32, 4); 751 u16 = getpid(); 752 memcpy(rnd + 12, &u16, 2); 753 } 754 755 u_int 756 res_nrandomid(res_state statp) { 757 struct timeval now; 758 u_int16_t u16; 759 MD5_CTX ctx; 760 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 761 762 gettimeofday(&now, NULL); 763 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 764 memcpy(rnd + 14, &u16, 2); 765 #ifndef HAVE_MD5 766 MD5_Init(&ctx); 767 MD5_Update(&ctx, rnd, 16); 768 MD5_Final(rnd, &ctx); 769 #else 770 MD5Init(&ctx); 771 MD5Update(&ctx, rnd, 16); 772 MD5Final(rnd, &ctx); 773 #endif 774 memcpy(&u16, rnd + 14, 2); 775 return ((u_int) u16); 776 } 777 778 /*% 779 * This routine is for closing the socket if a virtual circuit is used and 780 * the program wants to close it. This provides support for endhostent() 781 * which expects to close the socket. 782 * 783 * This routine is not expected to be user visible. 784 */ 785 void 786 res_nclose(res_state statp) { 787 int ns; 788 789 if (statp->_vcsock >= 0) { 790 (void) _close(statp->_vcsock); 791 statp->_vcsock = -1; 792 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 793 } 794 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 795 if (statp->_u._ext.nssocks[ns] != -1) { 796 (void) _close(statp->_u._ext.nssocks[ns]); 797 statp->_u._ext.nssocks[ns] = -1; 798 } 799 } 800 } 801 802 void 803 res_ndestroy(res_state statp) { 804 res_nclose(statp); 805 if (statp->_u._ext.ext != NULL) { 806 free(statp->_u._ext.ext); 807 statp->_u._ext.ext = NULL; 808 } 809 if (statp->_rnd != NULL) { 810 free(statp->_rnd); 811 statp->_rnd = NULL; 812 } 813 statp->options &= ~RES_INIT; 814 } 815 816 #ifndef _LIBC 817 const char * 818 res_get_nibblesuffix(res_state statp) { 819 if (statp->_u._ext.ext) 820 return (statp->_u._ext.ext->nsuffix); 821 return ("ip6.arpa"); 822 } 823 824 const char * 825 res_get_nibblesuffix2(res_state statp) { 826 if (statp->_u._ext.ext) 827 return (statp->_u._ext.ext->nsuffix2); 828 return ("ip6.int"); 829 } 830 #endif 831 832 void 833 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 834 int i, nserv; 835 size_t size; 836 837 /* close open servers */ 838 res_nclose(statp); 839 840 /* cause rtt times to be forgotten */ 841 statp->_u._ext.nscount = 0; 842 843 nserv = 0; 844 for (i = 0; i < cnt && nserv < MAXNS; i++) { 845 switch (set->sin.sin_family) { 846 case AF_INET: 847 size = sizeof(set->sin); 848 if (statp->_u._ext.ext) 849 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 850 &set->sin, size); 851 if (size <= sizeof(statp->nsaddr_list[nserv])) 852 memcpy(&statp->nsaddr_list[nserv], 853 &set->sin, size); 854 else 855 statp->nsaddr_list[nserv].sin_family = 0; 856 nserv++; 857 break; 858 859 #ifdef HAS_INET6_STRUCTS 860 case AF_INET6: 861 size = sizeof(set->sin6); 862 if (statp->_u._ext.ext) 863 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 864 &set->sin6, size); 865 if (size <= sizeof(statp->nsaddr_list[nserv])) 866 memcpy(&statp->nsaddr_list[nserv], 867 &set->sin6, size); 868 else 869 statp->nsaddr_list[nserv].sin_family = 0; 870 nserv++; 871 break; 872 #endif 873 874 default: 875 break; 876 } 877 set++; 878 } 879 statp->nscount = nserv; 880 881 } 882 883 int 884 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 885 int i; 886 size_t size; 887 u_int16_t family; 888 889 for (i = 0; i < statp->nscount && i < cnt; i++) { 890 if (statp->_u._ext.ext) 891 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 892 else 893 family = statp->nsaddr_list[i].sin_family; 894 895 switch (family) { 896 case AF_INET: 897 size = sizeof(set->sin); 898 if (statp->_u._ext.ext) 899 memcpy(&set->sin, 900 &statp->_u._ext.ext->nsaddrs[i], 901 size); 902 else 903 memcpy(&set->sin, &statp->nsaddr_list[i], 904 size); 905 break; 906 907 #ifdef HAS_INET6_STRUCTS 908 case AF_INET6: 909 size = sizeof(set->sin6); 910 if (statp->_u._ext.ext) 911 memcpy(&set->sin6, 912 &statp->_u._ext.ext->nsaddrs[i], 913 size); 914 else 915 memcpy(&set->sin6, &statp->nsaddr_list[i], 916 size); 917 break; 918 #endif 919 920 default: 921 set->sin.sin_family = 0; 922 break; 923 } 924 set++; 925 } 926 return (statp->nscount); 927 } 928 929 /*! \file */ 930