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) 72 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 73 static const char rcsid[] = "$Id: res_init.c,v 1.9.2.5.4.5 2005/11/03 00:00:52 marka Exp $"; 74 #endif /* LIBC_SCCS and not lint */ 75 #include <sys/cdefs.h> 76 __FBSDID("$FreeBSD$"); 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 114 115 static void res_setoptions(res_state, const char *, const char *); 116 117 #ifdef RESOLVSORT 118 static const char sort_mask[] = "/&"; 119 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 120 static 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 */ 152 int 153 res_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. */ 160 int 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 if (cp == NULL) { 247 if (strlcpy(statp->defdname, buf, 248 sizeof(statp->defdname)) 249 >= sizeof(statp->defdname)) 250 goto freedata; 251 } else { 252 if (strlcpy(statp->defdname, cp+1, 253 sizeof(statp->defdname)) 254 >= sizeof(statp->defdname)) 255 goto freedata; 256 } 257 } 258 } 259 #endif /* SOLARIS2 */ 260 261 /* Allow user to override the local domain definition */ 262 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 263 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 264 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 265 haveenv++; 266 267 /* 268 * Set search list to be blank-separated strings 269 * from rest of env value. Permits users of LOCALDOMAIN 270 * to still have a search list, and anyone to set the 271 * one that they want to use as an individual (even more 272 * important now that the rfc1535 stuff restricts searches) 273 */ 274 cp = statp->defdname; 275 pp = statp->dnsrch; 276 *pp++ = cp; 277 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 278 if (*cp == '\n') /* silly backwards compat */ 279 break; 280 else if (*cp == ' ' || *cp == '\t') { 281 *cp = 0; 282 n = 1; 283 } else if (n) { 284 *pp++ = cp; 285 n = 0; 286 havesearch = 1; 287 } 288 } 289 /* null terminate last domain if there are excess */ 290 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 291 cp++; 292 *cp = '\0'; 293 *pp++ = 0; 294 } 295 296 #define MATCH(line, name) \ 297 (!strncmp(line, name, sizeof(name) - 1) && \ 298 (line[sizeof(name) - 1] == ' ' || \ 299 line[sizeof(name) - 1] == '\t')) 300 301 nserv = 0; 302 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 303 /* read the config file */ 304 while (fgets(buf, sizeof(buf), fp) != NULL) { 305 /* skip comments */ 306 if (*buf == ';' || *buf == '#') 307 continue; 308 /* read default domain name */ 309 if (MATCH(buf, "domain")) { 310 if (haveenv) /* skip if have from environ */ 311 continue; 312 cp = buf + sizeof("domain") - 1; 313 while (*cp == ' ' || *cp == '\t') 314 cp++; 315 if ((*cp == '\0') || (*cp == '\n')) 316 continue; 317 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 318 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 319 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 320 *cp = '\0'; 321 havesearch = 0; 322 continue; 323 } 324 /* set search list */ 325 if (MATCH(buf, "search")) { 326 if (haveenv) /* skip if have from environ */ 327 continue; 328 cp = buf + sizeof("search") - 1; 329 while (*cp == ' ' || *cp == '\t') 330 cp++; 331 if ((*cp == '\0') || (*cp == '\n')) 332 continue; 333 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 334 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 335 if ((cp = strchr(statp->defdname, '\n')) != NULL) 336 *cp = '\0'; 337 /* 338 * Set search list to be blank-separated strings 339 * on rest of line. 340 */ 341 cp = statp->defdname; 342 pp = statp->dnsrch; 343 *pp++ = cp; 344 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 345 if (*cp == ' ' || *cp == '\t') { 346 *cp = 0; 347 n = 1; 348 } else if (n) { 349 *pp++ = cp; 350 n = 0; 351 } 352 } 353 /* null terminate last domain if there are excess */ 354 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 355 cp++; 356 *cp = '\0'; 357 *pp++ = 0; 358 havesearch = 1; 359 continue; 360 } 361 /* read nameservers to query */ 362 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 363 struct addrinfo hints, *ai; 364 char sbuf[NI_MAXSERV]; 365 const size_t minsiz = 366 sizeof(statp->_u._ext.ext->nsaddrs[0]); 367 368 cp = buf + sizeof("nameserver") - 1; 369 while (*cp == ' ' || *cp == '\t') 370 cp++; 371 cp[strcspn(cp, ";# \t\n")] = '\0'; 372 if ((*cp != '\0') && (*cp != '\n')) { 373 memset(&hints, 0, sizeof(hints)); 374 hints.ai_family = PF_UNSPEC; 375 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 376 hints.ai_flags = AI_NUMERICHOST; 377 sprintf(sbuf, "%u", NAMESERVER_PORT); 378 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 379 ai->ai_addrlen <= minsiz) { 380 if (statp->_u._ext.ext != NULL) { 381 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 382 ai->ai_addr, ai->ai_addrlen); 383 } 384 if (ai->ai_addrlen <= 385 sizeof(statp->nsaddr_list[nserv])) { 386 memcpy(&statp->nsaddr_list[nserv], 387 ai->ai_addr, ai->ai_addrlen); 388 } else 389 statp->nsaddr_list[nserv].sin_family = 0; 390 freeaddrinfo(ai); 391 nserv++; 392 } 393 } 394 continue; 395 } 396 #ifdef RESOLVSORT 397 if (MATCH(buf, "sortlist")) { 398 struct in_addr a; 399 struct in6_addr a6; 400 int m, i; 401 u_char *u; 402 struct __res_state_ext *ext = statp->_u._ext.ext; 403 404 cp = buf + sizeof("sortlist") - 1; 405 while (nsort < MAXRESOLVSORT) { 406 while (*cp == ' ' || *cp == '\t') 407 cp++; 408 if (*cp == '\0' || *cp == '\n' || *cp == ';') 409 break; 410 net = cp; 411 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 412 isascii(*cp) && !isspace((unsigned char)*cp)) 413 cp++; 414 n = *cp; 415 *cp = 0; 416 if (inet_aton(net, &a)) { 417 statp->sort_list[nsort].addr = a; 418 if (ISSORTMASK(n)) { 419 *cp++ = n; 420 net = cp; 421 while (*cp && *cp != ';' && 422 isascii(*cp) && 423 !isspace((unsigned char)*cp)) 424 cp++; 425 n = *cp; 426 *cp = 0; 427 if (inet_aton(net, &a)) { 428 statp->sort_list[nsort].mask = a.s_addr; 429 } else { 430 statp->sort_list[nsort].mask = 431 net_mask(statp->sort_list[nsort].addr); 432 } 433 } else { 434 statp->sort_list[nsort].mask = 435 net_mask(statp->sort_list[nsort].addr); 436 } 437 ext->sort_list[nsort].af = AF_INET; 438 ext->sort_list[nsort].addr.ina = 439 statp->sort_list[nsort].addr; 440 ext->sort_list[nsort].mask.ina.s_addr = 441 statp->sort_list[nsort].mask; 442 nsort++; 443 } 444 else if (inet_pton(AF_INET6, net, &a6) == 1) { 445 446 ext->sort_list[nsort].af = AF_INET6; 447 ext->sort_list[nsort].addr.in6a = a6; 448 u = (u_char *)&ext->sort_list[nsort].mask.in6a; 449 *cp++ = n; 450 net = cp; 451 while (*cp && *cp != ';' && 452 isascii(*cp) && !isspace(*cp)) 453 cp++; 454 m = n; 455 n = *cp; 456 *cp = 0; 457 switch (m) { 458 case '/': 459 m = atoi(net); 460 break; 461 case '&': 462 if (inet_pton(AF_INET6, net, u) == 1) { 463 m = -1; 464 break; 465 } 466 /*FALLTHROUGH*/ 467 default: 468 m = sizeof(struct in6_addr) * CHAR_BIT; 469 break; 470 } 471 if (m >= 0) { 472 for (i = 0; i < sizeof(struct in6_addr); i++) { 473 if (m <= 0) { 474 *u = 0; 475 } else { 476 m -= CHAR_BIT; 477 *u = (u_char)~0; 478 if (m < 0) 479 *u <<= -m; 480 } 481 u++; 482 } 483 } 484 statp->sort_list[nsort].addr.s_addr = 485 (u_int32_t)0xffffffff; 486 statp->sort_list[nsort].mask = 487 (u_int32_t)0xffffffff; 488 nsort++; 489 } 490 *cp = n; 491 } 492 continue; 493 } 494 #endif 495 if (MATCH(buf, "options")) { 496 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 497 continue; 498 } 499 } 500 if (nserv > 0) 501 statp->nscount = nserv; 502 #ifdef RESOLVSORT 503 statp->nsort = nsort; 504 #endif 505 (void) fclose(fp); 506 } 507 /* 508 * Last chance to get a nameserver. This should not normally 509 * be necessary 510 */ 511 #ifdef NO_RESOLV_CONF 512 if(nserv == 0) 513 nserv = get_nameservers(statp); 514 #endif 515 516 if (statp->defdname[0] == 0 && 517 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 518 (cp = strchr(buf, '.')) != NULL) 519 strcpy(statp->defdname, cp + 1); 520 521 /* find components of local domain that might be searched */ 522 if (havesearch == 0) { 523 pp = statp->dnsrch; 524 *pp++ = statp->defdname; 525 *pp = NULL; 526 527 dots = 0; 528 for (cp = statp->defdname; *cp; cp++) 529 dots += (*cp == '.'); 530 531 cp = statp->defdname; 532 while (pp < statp->dnsrch + MAXDFLSRCH) { 533 if (dots < LOCALDOMAINPARTS) 534 break; 535 cp = strchr(cp, '.') + 1; /* we know there is one */ 536 *pp++ = cp; 537 dots--; 538 } 539 *pp = NULL; 540 #ifdef DEBUG 541 if (statp->options & RES_DEBUG) { 542 printf(";; res_init()... default dnsrch list:\n"); 543 for (pp = statp->dnsrch; *pp; pp++) 544 printf(";;\t%s\n", *pp); 545 printf(";;\t..END..\n"); 546 } 547 #endif 548 } 549 550 if (issetugid()) 551 statp->options |= RES_NOALIASES; 552 else if ((cp = getenv("RES_OPTIONS")) != NULL) 553 res_setoptions(statp, cp, "env"); 554 statp->options |= RES_INIT; 555 return (0); 556 557 #ifdef SOLARIS2 558 freedata: 559 if (statp->_u._ext.ext != NULL) { 560 free(statp->_u._ext.ext); 561 statp->_u._ext.ext = NULL; 562 } 563 return (-1); 564 #endif 565 } 566 567 static void 568 res_setoptions(res_state statp, const char *options, const char *source) 569 { 570 const char *cp = options; 571 int i; 572 #ifndef _LIBC 573 struct __res_state_ext *ext = statp->_u._ext.ext; 574 #endif 575 576 #ifdef DEBUG 577 if (statp->options & RES_DEBUG) 578 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 579 options, source); 580 #endif 581 while (*cp) { 582 /* skip leading and inner runs of spaces */ 583 while (*cp == ' ' || *cp == '\t') 584 cp++; 585 /* search for and process individual options */ 586 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 587 i = atoi(cp + sizeof("ndots:") - 1); 588 if (i <= RES_MAXNDOTS) 589 statp->ndots = i; 590 else 591 statp->ndots = RES_MAXNDOTS; 592 #ifdef DEBUG 593 if (statp->options & RES_DEBUG) 594 printf(";;\tndots=%d\n", statp->ndots); 595 #endif 596 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 597 i = atoi(cp + sizeof("timeout:") - 1); 598 if (i <= RES_MAXRETRANS) 599 statp->retrans = i; 600 else 601 statp->retrans = RES_MAXRETRANS; 602 #ifdef DEBUG 603 if (statp->options & RES_DEBUG) 604 printf(";;\ttimeout=%d\n", statp->retrans); 605 #endif 606 #ifdef SOLARIS2 607 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 608 /* 609 * For backward compatibility, 'retrans' is 610 * supported as an alias for 'timeout', though 611 * without an imposed maximum. 612 */ 613 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 614 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 615 /* 616 * For backward compatibility, 'retry' is 617 * supported as an alias for 'attempts', though 618 * without an imposed maximum. 619 */ 620 statp->retry = atoi(cp + sizeof("retry:") - 1); 621 #endif /* SOLARIS2 */ 622 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 623 i = atoi(cp + sizeof("attempts:") - 1); 624 if (i <= RES_MAXRETRY) 625 statp->retry = i; 626 else 627 statp->retry = RES_MAXRETRY; 628 #ifdef DEBUG 629 if (statp->options & RES_DEBUG) 630 printf(";;\tattempts=%d\n", statp->retry); 631 #endif 632 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 633 #ifdef DEBUG 634 if (!(statp->options & RES_DEBUG)) { 635 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 636 options, source); 637 statp->options |= RES_DEBUG; 638 } 639 printf(";;\tdebug\n"); 640 #endif 641 } else if (!strncmp(cp, "no_tld_query", 642 sizeof("no_tld_query") - 1) || 643 !strncmp(cp, "no-tld-query", 644 sizeof("no-tld-query") - 1)) { 645 statp->options |= RES_NOTLDQUERY; 646 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 647 statp->options |= RES_USE_INET6; 648 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 649 statp->options |= RES_INSECURE1; 650 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 651 statp->options |= RES_INSECURE2; 652 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 653 statp->options |= RES_ROTATE; 654 } else if (!strncmp(cp, "no-check-names", 655 sizeof("no-check-names") - 1)) { 656 statp->options |= RES_NOCHECKNAME; 657 } 658 #ifdef RES_USE_EDNS0 659 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 660 statp->options |= RES_USE_EDNS0; 661 } 662 #endif 663 #ifndef _LIBC 664 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 665 statp->options |= RES_USE_DNAME; 666 } 667 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 668 if (ext == NULL) 669 goto skip; 670 cp += sizeof("nibble:") - 1; 671 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 672 strncpy(ext->nsuffix, cp, i); 673 ext->nsuffix[i] = '\0'; 674 } 675 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 676 if (ext == NULL) 677 goto skip; 678 cp += sizeof("nibble2:") - 1; 679 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 680 strncpy(ext->nsuffix2, cp, i); 681 ext->nsuffix2[i] = '\0'; 682 } 683 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 684 cp += sizeof("v6revmode:") - 1; 685 /* "nibble" and "bitstring" used to be valid */ 686 if (!strncmp(cp, "single", sizeof("single") - 1)) { 687 statp->options |= RES_NO_NIBBLE2; 688 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 689 statp->options &= 690 ~RES_NO_NIBBLE2; 691 } 692 } 693 #endif 694 else { 695 /* XXX - print a warning here? */ 696 } 697 #ifndef _LIBC 698 skip: 699 #endif 700 /* skip to next run of spaces */ 701 while (*cp && *cp != ' ' && *cp != '\t') 702 cp++; 703 } 704 } 705 706 #ifdef RESOLVSORT 707 /* XXX - should really support CIDR which means explicit masks always. */ 708 static u_int32_t 709 net_mask(in) /* XXX - should really use system's version of this */ 710 struct in_addr in; 711 { 712 u_int32_t i = ntohl(in.s_addr); 713 714 if (IN_CLASSA(i)) 715 return (htonl(IN_CLASSA_NET)); 716 else if (IN_CLASSB(i)) 717 return (htonl(IN_CLASSB_NET)); 718 return (htonl(IN_CLASSC_NET)); 719 } 720 #endif 721 722 u_int 723 res_randomid(void) { 724 struct timeval now; 725 726 gettimeofday(&now, NULL); 727 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 728 } 729 730 /* 731 * This routine is for closing the socket if a virtual circuit is used and 732 * the program wants to close it. This provides support for endhostent() 733 * which expects to close the socket. 734 * 735 * This routine is not expected to be user visible. 736 */ 737 void 738 res_nclose(res_state statp) { 739 int ns; 740 741 if (statp->_vcsock >= 0) { 742 (void) _close(statp->_vcsock); 743 statp->_vcsock = -1; 744 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 745 } 746 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 747 if (statp->_u._ext.nssocks[ns] != -1) { 748 (void) _close(statp->_u._ext.nssocks[ns]); 749 statp->_u._ext.nssocks[ns] = -1; 750 } 751 } 752 } 753 754 void 755 res_ndestroy(res_state statp) { 756 res_nclose(statp); 757 if (statp->_u._ext.ext != NULL) 758 free(statp->_u._ext.ext); 759 statp->options &= ~RES_INIT; 760 statp->_u._ext.ext = NULL; 761 } 762 763 #ifndef _LIBC 764 const char * 765 res_get_nibblesuffix(res_state statp) { 766 if (statp->_u._ext.ext) 767 return (statp->_u._ext.ext->nsuffix); 768 return ("ip6.arpa"); 769 } 770 771 const char * 772 res_get_nibblesuffix2(res_state statp) { 773 if (statp->_u._ext.ext) 774 return (statp->_u._ext.ext->nsuffix2); 775 return ("ip6.int"); 776 } 777 #endif 778 779 void 780 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 781 int i, nserv; 782 size_t size; 783 784 /* close open servers */ 785 res_nclose(statp); 786 787 /* cause rtt times to be forgotten */ 788 statp->_u._ext.nscount = 0; 789 790 nserv = 0; 791 for (i = 0; i < cnt && nserv < MAXNS; i++) { 792 switch (set->sin.sin_family) { 793 case AF_INET: 794 size = sizeof(set->sin); 795 if (statp->_u._ext.ext) 796 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 797 &set->sin, size); 798 if (size <= sizeof(statp->nsaddr_list[nserv])) 799 memcpy(&statp->nsaddr_list[nserv], 800 &set->sin, size); 801 else 802 statp->nsaddr_list[nserv].sin_family = 0; 803 nserv++; 804 break; 805 806 #ifdef HAS_INET6_STRUCTS 807 case AF_INET6: 808 size = sizeof(set->sin6); 809 if (statp->_u._ext.ext) 810 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 811 &set->sin6, size); 812 if (size <= sizeof(statp->nsaddr_list[nserv])) 813 memcpy(&statp->nsaddr_list[nserv], 814 &set->sin6, size); 815 else 816 statp->nsaddr_list[nserv].sin_family = 0; 817 nserv++; 818 break; 819 #endif 820 821 default: 822 break; 823 } 824 set++; 825 } 826 statp->nscount = nserv; 827 828 } 829 830 int 831 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 832 int i; 833 size_t size; 834 u_int16_t family; 835 836 for (i = 0; i < statp->nscount && i < cnt; i++) { 837 if (statp->_u._ext.ext) 838 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 839 else 840 family = statp->nsaddr_list[i].sin_family; 841 842 switch (family) { 843 case AF_INET: 844 size = sizeof(set->sin); 845 if (statp->_u._ext.ext) 846 memcpy(&set->sin, 847 &statp->_u._ext.ext->nsaddrs[i], 848 size); 849 else 850 memcpy(&set->sin, &statp->nsaddr_list[i], 851 size); 852 break; 853 854 #ifdef HAS_INET6_STRUCTS 855 case AF_INET6: 856 size = sizeof(set->sin6); 857 if (statp->_u._ext.ext) 858 memcpy(&set->sin6, 859 &statp->_u._ext.ext->nsaddrs[i], 860 size); 861 else 862 memcpy(&set->sin6, &statp->nsaddr_list[i], 863 size); 864 break; 865 #endif 866 867 default: 868 set->sin.sin_family = 0; 869 break; 870 } 871 set++; 872 } 873 return (statp->nscount); 874 } 875