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 1.23 2007/07/09 01:43:23 marka Exp $"; 74 #endif /* LIBC_SCCS and not lint */ 75 76 #include "port_before.h" 77 78 #ifdef _LIBC 79 #include "namespace.h" 80 #endif 81 #include <sys/types.h> 82 #include <sys/param.h> 83 #include <sys/socket.h> 84 #include <sys/time.h> 85 86 #include <netinet/in.h> 87 #include <arpa/inet.h> 88 #include <arpa/nameser.h> 89 90 #include <ctype.h> 91 #include <stdio.h> 92 #include <stdlib.h> 93 #include <string.h> 94 #include <unistd.h> 95 #include <netdb.h> 96 #ifdef _LIBC 97 #include "un-namespace.h" 98 #endif 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 __P((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 __P((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 int maxns = MAXNS; 176 177 RES_SET_H_ERRNO(statp, 0); 178 if (statp->_u._ext.ext != NULL) 179 res_ndestroy(statp); 180 181 if (!preinit) { 182 statp->retrans = RES_TIMEOUT; 183 statp->retry = RES_DFLRETRY; 184 statp->options = RES_DEFAULT; 185 statp->id = res_randomid(); 186 } 187 188 memset(u, 0, sizeof(u)); 189 #ifdef USELOOPBACK 190 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 191 #else 192 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 193 #endif 194 u[nserv].sin.sin_family = AF_INET; 195 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 196 #ifdef HAVE_SA_LEN 197 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 198 #endif 199 nserv++; 200 #ifdef HAS_INET6_STRUCTS 201 #ifdef USELOOPBACK 202 u[nserv].sin6.sin6_addr = in6addr_loopback; 203 #else 204 u[nserv].sin6.sin6_addr = in6addr_any; 205 #endif 206 u[nserv].sin6.sin6_family = AF_INET6; 207 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 208 #ifdef HAVE_SA_LEN 209 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 210 #endif 211 nserv++; 212 #endif 213 statp->nscount = 0; 214 statp->ndots = 1; 215 statp->pfcode = 0; 216 statp->_vcsock = -1; 217 statp->_flags = 0; 218 statp->qhook = NULL; 219 statp->rhook = NULL; 220 statp->_u._ext.nscount = 0; 221 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 222 if (statp->_u._ext.ext != NULL) { 223 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 224 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 225 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 226 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 227 } else { 228 /* 229 * Historically res_init() rarely, if at all, failed. 230 * Examples and applications exist which do not check 231 * our return code. Furthermore several applications 232 * simply call us to get the systems domainname. So 233 * rather then immediately fail here we store the 234 * failure, which is returned later, in h_errno. And 235 * prevent the collection of 'nameserver' information 236 * by setting maxns to 0. Thus applications that fail 237 * to check our return code wont be able to make 238 * queries anyhow. 239 */ 240 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 241 maxns = 0; 242 } 243 #ifdef RESOLVSORT 244 statp->nsort = 0; 245 #endif 246 res_setservers(statp, u, nserv); 247 248 #ifdef SOLARIS2 249 /* 250 * The old libresolv derived the defaultdomain from NIS/NIS+. 251 * We want to keep this behaviour 252 */ 253 { 254 char buf[sizeof(statp->defdname)], *cp; 255 int ret; 256 257 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 258 (unsigned int)ret <= sizeof(buf)) { 259 if (buf[0] == '+') 260 buf[0] = '.'; 261 cp = strchr(buf, '.'); 262 cp = (cp == NULL) ? buf : (cp + 1); 263 strncpy(statp->defdname, cp, 264 sizeof(statp->defdname) - 1); 265 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 266 } 267 } 268 #endif /* SOLARIS2 */ 269 270 /* Allow user to override the local domain definition */ 271 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 272 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 273 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 274 haveenv++; 275 276 /* 277 * Set search list to be blank-separated strings 278 * from rest of env value. Permits users of LOCALDOMAIN 279 * to still have a search list, and anyone to set the 280 * one that they want to use as an individual (even more 281 * important now that the rfc1535 stuff restricts searches) 282 */ 283 cp = statp->defdname; 284 pp = statp->dnsrch; 285 *pp++ = cp; 286 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 287 if (*cp == '\n') /*%< silly backwards compat */ 288 break; 289 else if (*cp == ' ' || *cp == '\t') { 290 *cp = 0; 291 n = 1; 292 } else if (n) { 293 *pp++ = cp; 294 n = 0; 295 havesearch = 1; 296 } 297 } 298 /* null terminate last domain if there are excess */ 299 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 300 cp++; 301 *cp = '\0'; 302 *pp++ = NULL; 303 } 304 305 #define MATCH(line, name) \ 306 (!strncmp(line, name, sizeof(name) - 1) && \ 307 (line[sizeof(name) - 1] == ' ' || \ 308 line[sizeof(name) - 1] == '\t')) 309 310 nserv = 0; 311 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 312 /* read the config file */ 313 while (fgets(buf, sizeof(buf), fp) != NULL) { 314 /* skip comments */ 315 if (*buf == ';' || *buf == '#') 316 continue; 317 /* read default domain name */ 318 if (MATCH(buf, "domain")) { 319 if (haveenv) /*%< skip if have from environ */ 320 continue; 321 cp = buf + sizeof("domain") - 1; 322 while (*cp == ' ' || *cp == '\t') 323 cp++; 324 if ((*cp == '\0') || (*cp == '\n')) 325 continue; 326 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 327 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 328 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 329 *cp = '\0'; 330 havesearch = 0; 331 continue; 332 } 333 /* set search list */ 334 if (MATCH(buf, "search")) { 335 if (haveenv) /*%< skip if have from environ */ 336 continue; 337 cp = buf + sizeof("search") - 1; 338 while (*cp == ' ' || *cp == '\t') 339 cp++; 340 if ((*cp == '\0') || (*cp == '\n')) 341 continue; 342 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 343 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 344 if ((cp = strchr(statp->defdname, '\n')) != NULL) 345 *cp = '\0'; 346 /* 347 * Set search list to be blank-separated strings 348 * on rest of line. 349 */ 350 cp = statp->defdname; 351 pp = statp->dnsrch; 352 *pp++ = cp; 353 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 354 if (*cp == ' ' || *cp == '\t') { 355 *cp = 0; 356 n = 1; 357 } else if (n) { 358 *pp++ = cp; 359 n = 0; 360 } 361 } 362 /* null terminate last domain if there are excess */ 363 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 364 cp++; 365 *cp = '\0'; 366 *pp++ = NULL; 367 havesearch = 1; 368 continue; 369 } 370 /* read nameservers to query */ 371 if (MATCH(buf, "nameserver") && nserv < maxns) { 372 struct addrinfo hints, *ai; 373 char sbuf[NI_MAXSERV]; 374 const size_t minsiz = 375 sizeof(statp->_u._ext.ext->nsaddrs[0]); 376 377 cp = buf + sizeof("nameserver") - 1; 378 while (*cp == ' ' || *cp == '\t') 379 cp++; 380 cp[strcspn(cp, ";# \t\n")] = '\0'; 381 if ((*cp != '\0') && (*cp != '\n')) { 382 memset(&hints, 0, sizeof(hints)); 383 hints.ai_family = PF_UNSPEC; 384 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 385 hints.ai_flags = AI_NUMERICHOST; 386 sprintf(sbuf, "%u", NAMESERVER_PORT); 387 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 388 ai->ai_addrlen <= minsiz) { 389 if (statp->_u._ext.ext != NULL) { 390 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 391 ai->ai_addr, ai->ai_addrlen); 392 } 393 if (ai->ai_addrlen <= 394 sizeof(statp->nsaddr_list[nserv])) { 395 memcpy(&statp->nsaddr_list[nserv], 396 ai->ai_addr, ai->ai_addrlen); 397 } else 398 statp->nsaddr_list[nserv].sin_family = 0; 399 freeaddrinfo(ai); 400 nserv++; 401 } 402 } 403 continue; 404 } 405 #ifdef RESOLVSORT 406 if (MATCH(buf, "sortlist")) { 407 struct in_addr a; 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 nsort++; 443 } 444 *cp = n; 445 } 446 continue; 447 } 448 #endif 449 if (MATCH(buf, "options")) { 450 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 451 continue; 452 } 453 } 454 if (nserv > 0) 455 statp->nscount = nserv; 456 #ifdef RESOLVSORT 457 statp->nsort = nsort; 458 #endif 459 (void) fclose(fp); 460 } 461 /* 462 * Last chance to get a nameserver. This should not normally 463 * be necessary 464 */ 465 #ifdef NO_RESOLV_CONF 466 if(nserv == 0) 467 nserv = get_nameservers(statp); 468 #endif 469 470 if (statp->defdname[0] == 0 && 471 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 472 (cp = strchr(buf, '.')) != NULL) 473 strcpy(statp->defdname, cp + 1); 474 475 /* find components of local domain that might be searched */ 476 if (havesearch == 0) { 477 pp = statp->dnsrch; 478 *pp++ = statp->defdname; 479 *pp = NULL; 480 481 dots = 0; 482 for (cp = statp->defdname; *cp; cp++) 483 dots += (*cp == '.'); 484 485 cp = statp->defdname; 486 while (pp < statp->dnsrch + MAXDFLSRCH) { 487 if (dots < LOCALDOMAINPARTS) 488 break; 489 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 490 *pp++ = cp; 491 dots--; 492 } 493 *pp = NULL; 494 #ifdef DEBUG 495 if (statp->options & RES_DEBUG) { 496 printf(";; res_init()... default dnsrch list:\n"); 497 for (pp = statp->dnsrch; *pp; pp++) 498 printf(";;\t%s\n", *pp); 499 printf(";;\t..END..\n"); 500 } 501 #endif 502 } 503 504 if ((cp = getenv("RES_OPTIONS")) != NULL) 505 res_setoptions(statp, cp, "env"); 506 statp->options |= RES_INIT; 507 return (statp->res_h_errno); 508 } 509 510 static void 511 res_setoptions(res_state statp, const char *options, const char *source) 512 { 513 const char *cp = options; 514 int i; 515 #ifndef _LIBC 516 struct __res_state_ext *ext = statp->_u._ext.ext; 517 #endif 518 519 #ifdef DEBUG 520 if (statp->options & RES_DEBUG) 521 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 522 options, source); 523 #endif 524 while (*cp) { 525 /* skip leading and inner runs of spaces */ 526 while (*cp == ' ' || *cp == '\t') 527 cp++; 528 /* search for and process individual options */ 529 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 530 i = atoi(cp + sizeof("ndots:") - 1); 531 if (i <= RES_MAXNDOTS) 532 statp->ndots = i; 533 else 534 statp->ndots = RES_MAXNDOTS; 535 #ifdef DEBUG 536 if (statp->options & RES_DEBUG) 537 printf(";;\tndots=%d\n", statp->ndots); 538 #endif 539 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 540 i = atoi(cp + sizeof("timeout:") - 1); 541 if (i <= RES_MAXRETRANS) 542 statp->retrans = i; 543 else 544 statp->retrans = RES_MAXRETRANS; 545 #ifdef DEBUG 546 if (statp->options & RES_DEBUG) 547 printf(";;\ttimeout=%d\n", statp->retrans); 548 #endif 549 #ifdef SOLARIS2 550 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 551 /* 552 * For backward compatibility, 'retrans' is 553 * supported as an alias for 'timeout', though 554 * without an imposed maximum. 555 */ 556 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 557 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 558 /* 559 * For backward compatibility, 'retry' is 560 * supported as an alias for 'attempts', though 561 * without an imposed maximum. 562 */ 563 statp->retry = atoi(cp + sizeof("retry:") - 1); 564 #endif /* SOLARIS2 */ 565 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 566 i = atoi(cp + sizeof("attempts:") - 1); 567 if (i <= RES_MAXRETRY) 568 statp->retry = i; 569 else 570 statp->retry = RES_MAXRETRY; 571 #ifdef DEBUG 572 if (statp->options & RES_DEBUG) 573 printf(";;\tattempts=%d\n", statp->retry); 574 #endif 575 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 576 #ifdef DEBUG 577 if (!(statp->options & RES_DEBUG)) { 578 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 579 options, source); 580 statp->options |= RES_DEBUG; 581 } 582 printf(";;\tdebug\n"); 583 #endif 584 } else if (!strncmp(cp, "no_tld_query", 585 sizeof("no_tld_query") - 1) || 586 !strncmp(cp, "no-tld-query", 587 sizeof("no-tld-query") - 1)) { 588 statp->options |= RES_NOTLDQUERY; 589 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 590 statp->options |= RES_USE_INET6; 591 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 592 statp->options |= RES_ROTATE; 593 } else if (!strncmp(cp, "no-check-names", 594 sizeof("no-check-names") - 1)) { 595 statp->options |= RES_NOCHECKNAME; 596 } 597 #ifdef RES_USE_EDNS0 598 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 599 statp->options |= RES_USE_EDNS0; 600 } 601 #endif 602 #ifndef _LIBC 603 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 604 statp->options |= RES_USE_DNAME; 605 } 606 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 607 if (ext == NULL) 608 goto skip; 609 cp += sizeof("nibble:") - 1; 610 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 611 strncpy(ext->nsuffix, cp, i); 612 ext->nsuffix[i] = '\0'; 613 } 614 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 615 if (ext == NULL) 616 goto skip; 617 cp += sizeof("nibble2:") - 1; 618 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 619 strncpy(ext->nsuffix2, cp, i); 620 ext->nsuffix2[i] = '\0'; 621 } 622 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 623 cp += sizeof("v6revmode:") - 1; 624 /* "nibble" and "bitstring" used to be valid */ 625 if (!strncmp(cp, "single", sizeof("single") - 1)) { 626 statp->options |= RES_NO_NIBBLE2; 627 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 628 statp->options &= 629 ~RES_NO_NIBBLE2; 630 } 631 } 632 #endif 633 else { 634 /* XXX - print a warning here? */ 635 } 636 #ifndef _LIBC 637 skip: 638 #endif 639 /* skip to next run of spaces */ 640 while (*cp && *cp != ' ' && *cp != '\t') 641 cp++; 642 } 643 } 644 645 #ifdef RESOLVSORT 646 /* XXX - should really support CIDR which means explicit masks always. */ 647 static u_int32_t 648 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 649 { 650 u_int32_t i = ntohl(in.s_addr); 651 652 if (IN_CLASSA(i)) 653 return (htonl(IN_CLASSA_NET)); 654 else if (IN_CLASSB(i)) 655 return (htonl(IN_CLASSB_NET)); 656 return (htonl(IN_CLASSC_NET)); 657 } 658 #endif 659 660 u_int 661 res_randomid(void) { 662 struct timeval now; 663 664 gettimeofday(&now, NULL); 665 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 666 } 667 668 /*% 669 * This routine is for closing the socket if a virtual circuit is used and 670 * the program wants to close it. This provides support for endhostent() 671 * which expects to close the socket. 672 * 673 * This routine is not expected to be user visible. 674 */ 675 void 676 res_nclose(res_state statp) { 677 int ns; 678 679 if (statp->_vcsock >= 0) { 680 #ifndef _LIBC 681 (void) close(statp->_vcsock); 682 #else 683 _close(statp->_vcsock); 684 #endif 685 statp->_vcsock = -1; 686 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 687 } 688 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 689 if (statp->_u._ext.nssocks[ns] != -1) { 690 #ifndef _LIBC 691 (void) close(statp->_u._ext.nssocks[ns]); 692 #else 693 _close(statp->_u._ext.nssocks[ns]); 694 #endif 695 statp->_u._ext.nssocks[ns] = -1; 696 } 697 } 698 } 699 700 void 701 res_ndestroy(res_state statp) { 702 res_nclose(statp); 703 if (statp->_u._ext.ext != NULL) 704 free(statp->_u._ext.ext); 705 statp->options &= ~RES_INIT; 706 statp->_u._ext.ext = NULL; 707 } 708 709 #ifndef _LIBC 710 const char * 711 res_get_nibblesuffix(res_state statp) { 712 if (statp->_u._ext.ext) 713 return (statp->_u._ext.ext->nsuffix); 714 return ("ip6.arpa"); 715 } 716 717 const char * 718 res_get_nibblesuffix2(res_state statp) { 719 if (statp->_u._ext.ext) 720 return (statp->_u._ext.ext->nsuffix2); 721 return ("ip6.int"); 722 } 723 #endif 724 725 void 726 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 727 int i, nserv; 728 size_t size; 729 730 /* close open servers */ 731 res_nclose(statp); 732 733 /* cause rtt times to be forgotten */ 734 statp->_u._ext.nscount = 0; 735 736 nserv = 0; 737 for (i = 0; i < cnt && nserv < MAXNS; i++) { 738 switch (set->sin.sin_family) { 739 case AF_INET: 740 size = sizeof(set->sin); 741 if (statp->_u._ext.ext) 742 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 743 &set->sin, size); 744 if (size <= sizeof(statp->nsaddr_list[nserv])) 745 memcpy(&statp->nsaddr_list[nserv], 746 &set->sin, size); 747 else 748 statp->nsaddr_list[nserv].sin_family = 0; 749 nserv++; 750 break; 751 752 #ifdef HAS_INET6_STRUCTS 753 case AF_INET6: 754 size = sizeof(set->sin6); 755 if (statp->_u._ext.ext) 756 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 757 &set->sin6, size); 758 if (size <= sizeof(statp->nsaddr_list[nserv])) 759 memcpy(&statp->nsaddr_list[nserv], 760 &set->sin6, size); 761 else 762 statp->nsaddr_list[nserv].sin_family = 0; 763 nserv++; 764 break; 765 #endif 766 767 default: 768 break; 769 } 770 set++; 771 } 772 statp->nscount = nserv; 773 774 } 775 776 int 777 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 778 int i; 779 size_t size; 780 u_int16_t family; 781 782 for (i = 0; i < statp->nscount && i < cnt; i++) { 783 if (statp->_u._ext.ext) 784 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 785 else 786 family = statp->nsaddr_list[i].sin_family; 787 788 switch (family) { 789 case AF_INET: 790 size = sizeof(set->sin); 791 if (statp->_u._ext.ext) 792 memcpy(&set->sin, 793 &statp->_u._ext.ext->nsaddrs[i], 794 size); 795 else 796 memcpy(&set->sin, &statp->nsaddr_list[i], 797 size); 798 break; 799 800 #ifdef HAS_INET6_STRUCTS 801 case AF_INET6: 802 size = sizeof(set->sin6); 803 if (statp->_u._ext.ext) 804 memcpy(&set->sin6, 805 &statp->_u._ext.ext->nsaddrs[i], 806 size); 807 else 808 memcpy(&set->sin6, &statp->nsaddr_list[i], 809 size); 810 break; 811 #endif 812 813 default: 814 set->sin.sin_family = 0; 815 break; 816 } 817 set++; 818 } 819 return (statp->nscount); 820 } 821 /*! \file */ 822