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 1.9.2.5.4.6 2006/08/30 23:23:01 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 #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 110 111 static void res_setoptions(res_state, const char *, const char *); 112 113 #ifdef RESOLVSORT 114 static const char sort_mask[] = "/&"; 115 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 116 static 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 */ 148 int 149 res_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. */ 156 int 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]; 171 172 if (statp->_u._ext.ext != NULL) 173 res_ndestroy(statp); 174 175 if (!preinit) { 176 statp->retrans = RES_TIMEOUT; 177 statp->retry = RES_DFLRETRY; 178 statp->options = RES_DEFAULT; 179 statp->id = res_randomid(); 180 } 181 182 memset(u, 0, sizeof(u)); 183 #ifdef USELOOPBACK 184 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 185 #else 186 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 187 #endif 188 u[nserv].sin.sin_family = AF_INET; 189 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 190 #ifdef HAVE_SA_LEN 191 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 192 #endif 193 nserv++; 194 #ifdef HAS_INET6_STRUCTS 195 #ifdef USELOOPBACK 196 u[nserv].sin6.sin6_addr = in6addr_loopback; 197 #else 198 u[nserv].sin6.sin6_addr = in6addr_any; 199 #endif 200 u[nserv].sin6.sin6_family = AF_INET6; 201 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 202 #ifdef HAVE_SA_LEN 203 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 204 #endif 205 nserv++; 206 #endif 207 statp->nscount = 0; 208 statp->ndots = 1; 209 statp->pfcode = 0; 210 statp->_vcsock = -1; 211 statp->_flags = 0; 212 statp->qhook = NULL; 213 statp->rhook = NULL; 214 statp->_u._ext.nscount = 0; 215 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 216 if (statp->_u._ext.ext != NULL) { 217 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 218 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 219 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 220 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 221 } else 222 return (-1); 223 #ifdef RESOLVSORT 224 statp->nsort = 0; 225 #endif 226 res_setservers(statp, u, nserv); 227 228 #ifdef SOLARIS2 229 /* 230 * The old libresolv derived the defaultdomain from NIS/NIS+. 231 * We want to keep this behaviour 232 */ 233 { 234 char buf[sizeof(statp->defdname)], *cp; 235 int ret; 236 237 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 238 (unsigned int)ret <= sizeof(buf)) { 239 if (buf[0] == '+') 240 buf[0] = '.'; 241 cp = strchr(buf, '.'); 242 cp = (cp == NULL) ? buf : (cp + 1); 243 if (strlen(cp) >= sizeof(statp->defdname)) 244 goto freedata; 245 strcpy(statp->defdname, cp); 246 } 247 } 248 #endif /* SOLARIS2 */ 249 250 /* Allow user to override the local domain definition */ 251 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 252 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 253 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 254 haveenv++; 255 256 /* 257 * Set search list to be blank-separated strings 258 * from rest of env value. Permits users of LOCALDOMAIN 259 * to still have a search list, and anyone to set the 260 * one that they want to use as an individual (even more 261 * important now that the rfc1535 stuff restricts searches) 262 */ 263 cp = statp->defdname; 264 pp = statp->dnsrch; 265 *pp++ = cp; 266 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 267 if (*cp == '\n') /* silly backwards compat */ 268 break; 269 else if (*cp == ' ' || *cp == '\t') { 270 *cp = 0; 271 n = 1; 272 } else if (n) { 273 *pp++ = cp; 274 n = 0; 275 havesearch = 1; 276 } 277 } 278 /* null terminate last domain if there are excess */ 279 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 280 cp++; 281 *cp = '\0'; 282 *pp++ = 0; 283 } 284 285 #define MATCH(line, name) \ 286 (!strncmp(line, name, sizeof(name) - 1) && \ 287 (line[sizeof(name) - 1] == ' ' || \ 288 line[sizeof(name) - 1] == '\t')) 289 290 nserv = 0; 291 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 292 /* read the config file */ 293 while (fgets(buf, sizeof(buf), fp) != NULL) { 294 /* skip comments */ 295 if (*buf == ';' || *buf == '#') 296 continue; 297 /* read default domain name */ 298 if (MATCH(buf, "domain")) { 299 if (haveenv) /* skip if have from environ */ 300 continue; 301 cp = buf + sizeof("domain") - 1; 302 while (*cp == ' ' || *cp == '\t') 303 cp++; 304 if ((*cp == '\0') || (*cp == '\n')) 305 continue; 306 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 307 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 308 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 309 *cp = '\0'; 310 havesearch = 0; 311 continue; 312 } 313 /* set search list */ 314 if (MATCH(buf, "search")) { 315 if (haveenv) /* skip if have from environ */ 316 continue; 317 cp = buf + sizeof("search") - 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 = strchr(statp->defdname, '\n')) != NULL) 325 *cp = '\0'; 326 /* 327 * Set search list to be blank-separated strings 328 * on rest of line. 329 */ 330 cp = statp->defdname; 331 pp = statp->dnsrch; 332 *pp++ = cp; 333 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 334 if (*cp == ' ' || *cp == '\t') { 335 *cp = 0; 336 n = 1; 337 } else if (n) { 338 *pp++ = cp; 339 n = 0; 340 } 341 } 342 /* null terminate last domain if there are excess */ 343 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 344 cp++; 345 *cp = '\0'; 346 *pp++ = 0; 347 havesearch = 1; 348 continue; 349 } 350 /* read nameservers to query */ 351 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 352 struct addrinfo hints, *ai; 353 char sbuf[NI_MAXSERV]; 354 const size_t minsiz = 355 sizeof(statp->_u._ext.ext->nsaddrs[0]); 356 357 cp = buf + sizeof("nameserver") - 1; 358 while (*cp == ' ' || *cp == '\t') 359 cp++; 360 cp[strcspn(cp, ";# \t\n")] = '\0'; 361 if ((*cp != '\0') && (*cp != '\n')) { 362 memset(&hints, 0, sizeof(hints)); 363 hints.ai_family = PF_UNSPEC; 364 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 365 hints.ai_flags = AI_NUMERICHOST; 366 sprintf(sbuf, "%u", NAMESERVER_PORT); 367 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 368 ai->ai_addrlen <= minsiz) { 369 if (statp->_u._ext.ext != NULL) { 370 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 371 ai->ai_addr, ai->ai_addrlen); 372 } 373 if (ai->ai_addrlen <= 374 sizeof(statp->nsaddr_list[nserv])) { 375 memcpy(&statp->nsaddr_list[nserv], 376 ai->ai_addr, ai->ai_addrlen); 377 } else 378 statp->nsaddr_list[nserv].sin_family = 0; 379 freeaddrinfo(ai); 380 nserv++; 381 } 382 } 383 continue; 384 } 385 #ifdef RESOLVSORT 386 if (MATCH(buf, "sortlist")) { 387 struct in_addr a; 388 struct in6_addr a6; 389 int m, i; 390 u_char *u; 391 struct __res_state_ext *ext = statp->_u._ext.ext; 392 393 cp = buf + sizeof("sortlist") - 1; 394 while (nsort < MAXRESOLVSORT) { 395 while (*cp == ' ' || *cp == '\t') 396 cp++; 397 if (*cp == '\0' || *cp == '\n' || *cp == ';') 398 break; 399 net = cp; 400 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 401 isascii(*cp) && !isspace((unsigned char)*cp)) 402 cp++; 403 n = *cp; 404 *cp = 0; 405 if (inet_aton(net, &a)) { 406 statp->sort_list[nsort].addr = a; 407 if (ISSORTMASK(n)) { 408 *cp++ = n; 409 net = cp; 410 while (*cp && *cp != ';' && 411 isascii(*cp) && 412 !isspace((unsigned char)*cp)) 413 cp++; 414 n = *cp; 415 *cp = 0; 416 if (inet_aton(net, &a)) { 417 statp->sort_list[nsort].mask = a.s_addr; 418 } else { 419 statp->sort_list[nsort].mask = 420 net_mask(statp->sort_list[nsort].addr); 421 } 422 } else { 423 statp->sort_list[nsort].mask = 424 net_mask(statp->sort_list[nsort].addr); 425 } 426 ext->sort_list[nsort].af = AF_INET; 427 ext->sort_list[nsort].addr.ina = 428 statp->sort_list[nsort].addr; 429 ext->sort_list[nsort].mask.ina.s_addr = 430 statp->sort_list[nsort].mask; 431 nsort++; 432 } 433 else if (inet_pton(AF_INET6, net, &a6) == 1) { 434 435 ext->sort_list[nsort].af = AF_INET6; 436 ext->sort_list[nsort].addr.in6a = a6; 437 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 438 *cp++ = n; 439 net = cp; 440 while (*cp && *cp != ';' && 441 isascii(*cp) && !isspace(*cp)) 442 cp++; 443 m = n; 444 n = *cp; 445 *cp = 0; 446 switch (m) { 447 case '/': 448 m = atoi(net); 449 break; 450 case '&': 451 if (inet_pton(AF_INET6, net, u) == 1) { 452 m = -1; 453 break; 454 } 455 /*FALLTHROUGH*/ 456 default: 457 m = sizeof(struct in6_addr) * CHAR_BIT; 458 break; 459 } 460 if (m >= 0) { 461 for (i = 0; i < sizeof(struct in6_addr); i++) { 462 if (m <= 0) { 463 *u = 0; 464 } else { 465 m -= CHAR_BIT; 466 *u = (u_char)~0; 467 if (m < 0) 468 *u <<= -m; 469 } 470 u++; 471 } 472 } 473 statp->sort_list[nsort].addr.s_addr = 474 (u_int32_t)0xffffffff; 475 statp->sort_list[nsort].mask = 476 (u_int32_t)0xffffffff; 477 nsort++; 478 } 479 *cp = n; 480 } 481 continue; 482 } 483 #endif 484 if (MATCH(buf, "options")) { 485 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 486 continue; 487 } 488 } 489 if (nserv > 0) 490 statp->nscount = nserv; 491 #ifdef RESOLVSORT 492 statp->nsort = nsort; 493 #endif 494 (void) fclose(fp); 495 } 496 /* 497 * Last chance to get a nameserver. This should not normally 498 * be necessary 499 */ 500 #ifdef NO_RESOLV_CONF 501 if(nserv == 0) 502 nserv = get_nameservers(statp); 503 #endif 504 505 if (statp->defdname[0] == 0 && 506 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 507 (cp = strchr(buf, '.')) != NULL) 508 strcpy(statp->defdname, cp + 1); 509 510 /* find components of local domain that might be searched */ 511 if (havesearch == 0) { 512 pp = statp->dnsrch; 513 *pp++ = statp->defdname; 514 *pp = NULL; 515 516 dots = 0; 517 for (cp = statp->defdname; *cp; cp++) 518 dots += (*cp == '.'); 519 520 cp = statp->defdname; 521 while (pp < statp->dnsrch + MAXDFLSRCH) { 522 if (dots < LOCALDOMAINPARTS) 523 break; 524 cp = strchr(cp, '.') + 1; /* we know there is one */ 525 *pp++ = cp; 526 dots--; 527 } 528 *pp = NULL; 529 #ifdef DEBUG 530 if (statp->options & RES_DEBUG) { 531 printf(";; res_init()... default dnsrch list:\n"); 532 for (pp = statp->dnsrch; *pp; pp++) 533 printf(";;\t%s\n", *pp); 534 printf(";;\t..END..\n"); 535 } 536 #endif 537 } 538 539 if (issetugid()) 540 statp->options |= RES_NOALIASES; 541 else if ((cp = getenv("RES_OPTIONS")) != NULL) 542 res_setoptions(statp, cp, "env"); 543 statp->options |= RES_INIT; 544 return (0); 545 546 #ifdef SOLARIS2 547 freedata: 548 if (statp->_u._ext.ext != NULL) { 549 free(statp->_u._ext.ext); 550 statp->_u._ext.ext = NULL; 551 } 552 return (-1); 553 #endif 554 } 555 556 static void 557 res_setoptions(res_state statp, const char *options, const char *source) 558 { 559 const char *cp = options; 560 int i; 561 #ifndef _LIBC 562 struct __res_state_ext *ext = statp->_u._ext.ext; 563 #endif 564 565 #ifdef DEBUG 566 if (statp->options & RES_DEBUG) 567 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 568 options, source); 569 #endif 570 while (*cp) { 571 /* skip leading and inner runs of spaces */ 572 while (*cp == ' ' || *cp == '\t') 573 cp++; 574 /* search for and process individual options */ 575 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 576 i = atoi(cp + sizeof("ndots:") - 1); 577 if (i <= RES_MAXNDOTS) 578 statp->ndots = i; 579 else 580 statp->ndots = RES_MAXNDOTS; 581 #ifdef DEBUG 582 if (statp->options & RES_DEBUG) 583 printf(";;\tndots=%d\n", statp->ndots); 584 #endif 585 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 586 i = atoi(cp + sizeof("timeout:") - 1); 587 if (i <= RES_MAXRETRANS) 588 statp->retrans = i; 589 else 590 statp->retrans = RES_MAXRETRANS; 591 #ifdef DEBUG 592 if (statp->options & RES_DEBUG) 593 printf(";;\ttimeout=%d\n", statp->retrans); 594 #endif 595 #ifdef SOLARIS2 596 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 597 /* 598 * For backward compatibility, 'retrans' is 599 * supported as an alias for 'timeout', though 600 * without an imposed maximum. 601 */ 602 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 603 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 604 /* 605 * For backward compatibility, 'retry' is 606 * supported as an alias for 'attempts', though 607 * without an imposed maximum. 608 */ 609 statp->retry = atoi(cp + sizeof("retry:") - 1); 610 #endif /* SOLARIS2 */ 611 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 612 i = atoi(cp + sizeof("attempts:") - 1); 613 if (i <= RES_MAXRETRY) 614 statp->retry = i; 615 else 616 statp->retry = RES_MAXRETRY; 617 #ifdef DEBUG 618 if (statp->options & RES_DEBUG) 619 printf(";;\tattempts=%d\n", statp->retry); 620 #endif 621 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 622 #ifdef DEBUG 623 if (!(statp->options & RES_DEBUG)) { 624 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 625 options, source); 626 statp->options |= RES_DEBUG; 627 } 628 printf(";;\tdebug\n"); 629 #endif 630 } else if (!strncmp(cp, "no_tld_query", 631 sizeof("no_tld_query") - 1) || 632 !strncmp(cp, "no-tld-query", 633 sizeof("no-tld-query") - 1)) { 634 statp->options |= RES_NOTLDQUERY; 635 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 636 statp->options |= RES_USE_INET6; 637 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 638 statp->options |= RES_INSECURE1; 639 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 640 statp->options |= RES_INSECURE2; 641 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 642 statp->options |= RES_ROTATE; 643 } else if (!strncmp(cp, "no-check-names", 644 sizeof("no-check-names") - 1)) { 645 statp->options |= RES_NOCHECKNAME; 646 } 647 #ifdef RES_USE_EDNS0 648 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 649 statp->options |= RES_USE_EDNS0; 650 } 651 #endif 652 #ifndef _LIBC 653 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 654 statp->options |= RES_USE_DNAME; 655 } 656 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 657 if (ext == NULL) 658 goto skip; 659 cp += sizeof("nibble:") - 1; 660 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 661 strncpy(ext->nsuffix, cp, i); 662 ext->nsuffix[i] = '\0'; 663 } 664 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 665 if (ext == NULL) 666 goto skip; 667 cp += sizeof("nibble2:") - 1; 668 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 669 strncpy(ext->nsuffix2, cp, i); 670 ext->nsuffix2[i] = '\0'; 671 } 672 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 673 cp += sizeof("v6revmode:") - 1; 674 /* "nibble" and "bitstring" used to be valid */ 675 if (!strncmp(cp, "single", sizeof("single") - 1)) { 676 statp->options |= RES_NO_NIBBLE2; 677 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 678 statp->options &= 679 ~RES_NO_NIBBLE2; 680 } 681 } 682 #endif 683 else { 684 /* XXX - print a warning here? */ 685 } 686 #ifndef _LIBC 687 skip: 688 #endif 689 /* skip to next run of spaces */ 690 while (*cp && *cp != ' ' && *cp != '\t') 691 cp++; 692 } 693 } 694 695 #ifdef RESOLVSORT 696 /* XXX - should really support CIDR which means explicit masks always. */ 697 static u_int32_t 698 net_mask(in) /* XXX - should really use system's version of this */ 699 struct in_addr in; 700 { 701 u_int32_t i = ntohl(in.s_addr); 702 703 if (IN_CLASSA(i)) 704 return (htonl(IN_CLASSA_NET)); 705 else if (IN_CLASSB(i)) 706 return (htonl(IN_CLASSB_NET)); 707 return (htonl(IN_CLASSC_NET)); 708 } 709 #endif 710 711 u_int 712 res_randomid(void) { 713 struct timeval now; 714 715 gettimeofday(&now, NULL); 716 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 717 } 718 719 /* 720 * This routine is for closing the socket if a virtual circuit is used and 721 * the program wants to close it. This provides support for endhostent() 722 * which expects to close the socket. 723 * 724 * This routine is not expected to be user visible. 725 */ 726 void 727 res_nclose(res_state statp) { 728 int ns; 729 730 if (statp->_vcsock >= 0) { 731 (void) _close(statp->_vcsock); 732 statp->_vcsock = -1; 733 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 734 } 735 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 736 if (statp->_u._ext.nssocks[ns] != -1) { 737 (void) _close(statp->_u._ext.nssocks[ns]); 738 statp->_u._ext.nssocks[ns] = -1; 739 } 740 } 741 } 742 743 void 744 res_ndestroy(res_state statp) { 745 res_nclose(statp); 746 if (statp->_u._ext.ext != NULL) 747 free(statp->_u._ext.ext); 748 statp->options &= ~RES_INIT; 749 statp->_u._ext.ext = NULL; 750 } 751 752 #ifndef _LIBC 753 const char * 754 res_get_nibblesuffix(res_state statp) { 755 if (statp->_u._ext.ext) 756 return (statp->_u._ext.ext->nsuffix); 757 return ("ip6.arpa"); 758 } 759 760 const char * 761 res_get_nibblesuffix2(res_state statp) { 762 if (statp->_u._ext.ext) 763 return (statp->_u._ext.ext->nsuffix2); 764 return ("ip6.int"); 765 } 766 #endif 767 768 void 769 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 770 int i, nserv; 771 size_t size; 772 773 /* close open servers */ 774 res_nclose(statp); 775 776 /* cause rtt times to be forgotten */ 777 statp->_u._ext.nscount = 0; 778 779 nserv = 0; 780 for (i = 0; i < cnt && nserv < MAXNS; i++) { 781 switch (set->sin.sin_family) { 782 case AF_INET: 783 size = sizeof(set->sin); 784 if (statp->_u._ext.ext) 785 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 786 &set->sin, size); 787 if (size <= sizeof(statp->nsaddr_list[nserv])) 788 memcpy(&statp->nsaddr_list[nserv], 789 &set->sin, size); 790 else 791 statp->nsaddr_list[nserv].sin_family = 0; 792 nserv++; 793 break; 794 795 #ifdef HAS_INET6_STRUCTS 796 case AF_INET6: 797 size = sizeof(set->sin6); 798 if (statp->_u._ext.ext) 799 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 800 &set->sin6, size); 801 if (size <= sizeof(statp->nsaddr_list[nserv])) 802 memcpy(&statp->nsaddr_list[nserv], 803 &set->sin6, size); 804 else 805 statp->nsaddr_list[nserv].sin_family = 0; 806 nserv++; 807 break; 808 #endif 809 810 default: 811 break; 812 } 813 set++; 814 } 815 statp->nscount = nserv; 816 817 } 818 819 int 820 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 821 int i; 822 size_t size; 823 u_int16_t family; 824 825 for (i = 0; i < statp->nscount && i < cnt; i++) { 826 if (statp->_u._ext.ext) 827 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 828 else 829 family = statp->nsaddr_list[i].sin_family; 830 831 switch (family) { 832 case AF_INET: 833 size = sizeof(set->sin); 834 if (statp->_u._ext.ext) 835 memcpy(&set->sin, 836 &statp->_u._ext.ext->nsaddrs[i], 837 size); 838 else 839 memcpy(&set->sin, &statp->nsaddr_list[i], 840 size); 841 break; 842 843 #ifdef HAS_INET6_STRUCTS 844 case AF_INET6: 845 size = sizeof(set->sin6); 846 if (statp->_u._ext.ext) 847 memcpy(&set->sin6, 848 &statp->_u._ext.ext->nsaddrs[i], 849 size); 850 else 851 memcpy(&set->sin6, &statp->nsaddr_list[i], 852 size); 853 break; 854 #endif 855 856 default: 857 set->sin.sin_family = 0; 858 break; 859 } 860 set++; 861 } 862 return (statp->nscount); 863 } 864