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 1.26 2008/12/11 09:59:00 marka Exp $"; 74 #endif /* LIBC_SCCS and not lint */ 75 76 #include "port_before.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 # endif 100 #endif 101 #ifndef _MD5_H_ 102 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 103 #endif 104 105 #include "port_after.h" 106 107 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 108 #include <resolv.h> 109 110 #include "res_private.h" 111 112 /*% Options. Should all be left alone. */ 113 #define RESOLVSORT 114 #define DEBUG 115 116 #ifdef SOLARIS2 117 #include <sys/systeminfo.h> 118 #endif 119 120 static void res_setoptions __P((res_state, const char *, const char *)); 121 122 #ifdef RESOLVSORT 123 static const char sort_mask[] = "/&"; 124 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 125 static u_int32_t net_mask __P((struct in_addr)); 126 #endif 127 128 #if !defined(isascii) /*%< XXX - could be a function */ 129 # define isascii(c) (!(c & 0200)) 130 #endif 131 132 /* 133 * Resolver state default settings. 134 */ 135 136 /*% 137 * Set up default settings. If the configuration file exist, the values 138 * there will have precedence. Otherwise, the server address is set to 139 * INADDR_ANY and the default domain name comes from the gethostname(). 140 * 141 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 142 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 143 * since it was noted that INADDR_ANY actually meant ``the first interface 144 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 145 * it had to be "up" in order for you to reach your own name server. It 146 * was later decided that since the recommended practice is to always 147 * install local static routes through 127.0.0.1 for all your network 148 * interfaces, that we could solve this problem without a code change. 149 * 150 * The configuration file should always be used, since it is the only way 151 * to specify a default domain. If you are running a server on your local 152 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 153 * in the configuration file. 154 * 155 * Return 0 if completes successfully, -1 on error 156 */ 157 int 158 res_ninit(res_state statp) { 159 extern int __res_vinit(res_state, int); 160 161 return (__res_vinit(statp, 0)); 162 } 163 164 /*% This function has to be reachable by res_data.c but not publically. */ 165 int 166 __res_vinit(res_state statp, int preinit) { 167 register FILE *fp; 168 register char *cp, **pp; 169 register int n; 170 char buf[BUFSIZ]; 171 int nserv = 0; /*%< number of nameserver records read from file */ 172 int haveenv = 0; 173 int havesearch = 0; 174 #ifdef RESOLVSORT 175 int nsort = 0; 176 char *net; 177 #endif 178 int dots; 179 union res_sockaddr_union u[2]; 180 int maxns = MAXNS; 181 182 RES_SET_H_ERRNO(statp, 0); 183 if (statp->_u._ext.ext != NULL) 184 res_ndestroy(statp); 185 186 if (!preinit) { 187 statp->retrans = RES_TIMEOUT; 188 statp->retry = RES_DFLRETRY; 189 statp->options = RES_DEFAULT; 190 res_rndinit(statp); 191 statp->id = res_nrandomid(statp); 192 } 193 194 memset(u, 0, sizeof(u)); 195 #ifdef USELOOPBACK 196 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 197 #else 198 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 199 #endif 200 u[nserv].sin.sin_family = AF_INET; 201 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 202 #ifdef HAVE_SA_LEN 203 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 204 #endif 205 nserv++; 206 #ifdef HAS_INET6_STRUCTS 207 #ifdef USELOOPBACK 208 u[nserv].sin6.sin6_addr = in6addr_loopback; 209 #else 210 u[nserv].sin6.sin6_addr = in6addr_any; 211 #endif 212 u[nserv].sin6.sin6_family = AF_INET6; 213 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 214 #ifdef HAVE_SA_LEN 215 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 216 #endif 217 nserv++; 218 #endif 219 statp->nscount = 0; 220 statp->ndots = 1; 221 statp->pfcode = 0; 222 statp->_vcsock = -1; 223 statp->_flags = 0; 224 statp->qhook = NULL; 225 statp->rhook = NULL; 226 statp->_u._ext.nscount = 0; 227 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 228 if (statp->_u._ext.ext != NULL) { 229 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 230 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 231 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 232 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 233 } else { 234 /* 235 * Historically res_init() rarely, if at all, failed. 236 * Examples and applications exist which do not check 237 * our return code. Furthermore several applications 238 * simply call us to get the systems domainname. So 239 * rather then immediately fail here we store the 240 * failure, which is returned later, in h_errno. And 241 * prevent the collection of 'nameserver' information 242 * by setting maxns to 0. Thus applications that fail 243 * to check our return code wont be able to make 244 * queries anyhow. 245 */ 246 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 247 maxns = 0; 248 } 249 #ifdef RESOLVSORT 250 statp->nsort = 0; 251 #endif 252 res_setservers(statp, u, nserv); 253 254 #ifdef SOLARIS2 255 /* 256 * The old libresolv derived the defaultdomain from NIS/NIS+. 257 * We want to keep this behaviour 258 */ 259 { 260 char buf[sizeof(statp->defdname)], *cp; 261 int ret; 262 263 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 264 (unsigned int)ret <= sizeof(buf)) { 265 if (buf[0] == '+') 266 buf[0] = '.'; 267 cp = strchr(buf, '.'); 268 cp = (cp == NULL) ? buf : (cp + 1); 269 strncpy(statp->defdname, cp, 270 sizeof(statp->defdname) - 1); 271 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 272 } 273 } 274 #endif /* SOLARIS2 */ 275 276 /* Allow user to override the local domain definition */ 277 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 278 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 279 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 280 haveenv++; 281 282 /* 283 * Set search list to be blank-separated strings 284 * from rest of env value. Permits users of LOCALDOMAIN 285 * to still have a search list, and anyone to set the 286 * one that they want to use as an individual (even more 287 * important now that the rfc1535 stuff restricts searches) 288 */ 289 cp = statp->defdname; 290 pp = statp->dnsrch; 291 *pp++ = cp; 292 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 293 if (*cp == '\n') /*%< silly backwards compat */ 294 break; 295 else if (*cp == ' ' || *cp == '\t') { 296 *cp = 0; 297 n = 1; 298 } else if (n) { 299 *pp++ = cp; 300 n = 0; 301 havesearch = 1; 302 } 303 } 304 /* null terminate last domain if there are excess */ 305 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 306 cp++; 307 *cp = '\0'; 308 *pp++ = 0; 309 } 310 311 #define MATCH(line, name) \ 312 (!strncmp(line, name, sizeof(name) - 1) && \ 313 (line[sizeof(name) - 1] == ' ' || \ 314 line[sizeof(name) - 1] == '\t')) 315 316 nserv = 0; 317 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 318 /* read the config file */ 319 while (fgets(buf, sizeof(buf), fp) != NULL) { 320 /* skip comments */ 321 if (*buf == ';' || *buf == '#') 322 continue; 323 /* read default domain name */ 324 if (MATCH(buf, "domain")) { 325 if (haveenv) /*%< skip if have from environ */ 326 continue; 327 cp = buf + sizeof("domain") - 1; 328 while (*cp == ' ' || *cp == '\t') 329 cp++; 330 if ((*cp == '\0') || (*cp == '\n')) 331 continue; 332 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 333 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 334 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 335 *cp = '\0'; 336 havesearch = 0; 337 continue; 338 } 339 /* set search list */ 340 if (MATCH(buf, "search")) { 341 if (haveenv) /*%< skip if have from environ */ 342 continue; 343 cp = buf + sizeof("search") - 1; 344 while (*cp == ' ' || *cp == '\t') 345 cp++; 346 if ((*cp == '\0') || (*cp == '\n')) 347 continue; 348 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 349 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 350 if ((cp = strchr(statp->defdname, '\n')) != NULL) 351 *cp = '\0'; 352 /* 353 * Set search list to be blank-separated strings 354 * on rest of line. 355 */ 356 cp = statp->defdname; 357 pp = statp->dnsrch; 358 *pp++ = cp; 359 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 360 if (*cp == ' ' || *cp == '\t') { 361 *cp = 0; 362 n = 1; 363 } else if (n) { 364 *pp++ = cp; 365 n = 0; 366 } 367 } 368 /* null terminate last domain if there are excess */ 369 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 370 cp++; 371 *cp = '\0'; 372 *pp++ = 0; 373 havesearch = 1; 374 continue; 375 } 376 /* read nameservers to query */ 377 if (MATCH(buf, "nameserver") && nserv < maxns) { 378 struct addrinfo hints, *ai; 379 char sbuf[NI_MAXSERV]; 380 const size_t minsiz = 381 sizeof(statp->_u._ext.ext->nsaddrs[0]); 382 383 cp = buf + sizeof("nameserver") - 1; 384 while (*cp == ' ' || *cp == '\t') 385 cp++; 386 cp[strcspn(cp, ";# \t\n")] = '\0'; 387 if ((*cp != '\0') && (*cp != '\n')) { 388 memset(&hints, 0, sizeof(hints)); 389 hints.ai_family = PF_UNSPEC; 390 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 391 hints.ai_flags = AI_NUMERICHOST; 392 sprintf(sbuf, "%u", NAMESERVER_PORT); 393 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 394 ai->ai_addrlen <= minsiz) { 395 if (statp->_u._ext.ext != NULL) { 396 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 397 ai->ai_addr, ai->ai_addrlen); 398 } 399 if (ai->ai_addrlen <= 400 sizeof(statp->nsaddr_list[nserv])) { 401 memcpy(&statp->nsaddr_list[nserv], 402 ai->ai_addr, ai->ai_addrlen); 403 } else 404 statp->nsaddr_list[nserv].sin_family = 0; 405 freeaddrinfo(ai); 406 nserv++; 407 } 408 } 409 continue; 410 } 411 #ifdef RESOLVSORT 412 if (MATCH(buf, "sortlist")) { 413 struct in_addr a; 414 415 cp = buf + sizeof("sortlist") - 1; 416 while (nsort < MAXRESOLVSORT) { 417 while (*cp == ' ' || *cp == '\t') 418 cp++; 419 if (*cp == '\0' || *cp == '\n' || *cp == ';') 420 break; 421 net = cp; 422 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 423 isascii(*cp) && !isspace((unsigned char)*cp)) 424 cp++; 425 n = *cp; 426 *cp = 0; 427 if (inet_aton(net, &a)) { 428 statp->sort_list[nsort].addr = a; 429 if (ISSORTMASK(n)) { 430 *cp++ = n; 431 net = cp; 432 while (*cp && *cp != ';' && 433 isascii(*cp) && 434 !isspace((unsigned char)*cp)) 435 cp++; 436 n = *cp; 437 *cp = 0; 438 if (inet_aton(net, &a)) { 439 statp->sort_list[nsort].mask = a.s_addr; 440 } else { 441 statp->sort_list[nsort].mask = 442 net_mask(statp->sort_list[nsort].addr); 443 } 444 } else { 445 statp->sort_list[nsort].mask = 446 net_mask(statp->sort_list[nsort].addr); 447 } 448 nsort++; 449 } 450 *cp = n; 451 } 452 continue; 453 } 454 #endif 455 if (MATCH(buf, "options")) { 456 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 457 continue; 458 } 459 } 460 if (nserv > 0) 461 statp->nscount = nserv; 462 #ifdef RESOLVSORT 463 statp->nsort = nsort; 464 #endif 465 (void) fclose(fp); 466 } 467 /* 468 * Last chance to get a nameserver. This should not normally 469 * be necessary 470 */ 471 #ifdef NO_RESOLV_CONF 472 if(nserv == 0) 473 nserv = get_nameservers(statp); 474 #endif 475 476 if (statp->defdname[0] == 0 && 477 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 478 (cp = strchr(buf, '.')) != NULL) 479 strcpy(statp->defdname, cp + 1); 480 481 /* find components of local domain that might be searched */ 482 if (havesearch == 0) { 483 pp = statp->dnsrch; 484 *pp++ = statp->defdname; 485 *pp = NULL; 486 487 dots = 0; 488 for (cp = statp->defdname; *cp; cp++) 489 dots += (*cp == '.'); 490 491 cp = statp->defdname; 492 while (pp < statp->dnsrch + MAXDFLSRCH) { 493 if (dots < LOCALDOMAINPARTS) 494 break; 495 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 496 *pp++ = cp; 497 dots--; 498 } 499 *pp = NULL; 500 #ifdef DEBUG 501 if (statp->options & RES_DEBUG) { 502 printf(";; res_init()... default dnsrch list:\n"); 503 for (pp = statp->dnsrch; *pp; pp++) 504 printf(";;\t%s\n", *pp); 505 printf(";;\t..END..\n"); 506 } 507 #endif 508 } 509 510 if ((cp = getenv("RES_OPTIONS")) != NULL) 511 res_setoptions(statp, cp, "env"); 512 statp->options |= RES_INIT; 513 return (statp->res_h_errno); 514 } 515 516 static void 517 res_setoptions(res_state statp, const char *options, const char *source) 518 { 519 const char *cp = options; 520 int i; 521 struct __res_state_ext *ext = statp->_u._ext.ext; 522 523 #ifdef DEBUG 524 if (statp->options & RES_DEBUG) 525 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 526 options, source); 527 #endif 528 while (*cp) { 529 /* skip leading and inner runs of spaces */ 530 while (*cp == ' ' || *cp == '\t') 531 cp++; 532 /* search for and process individual options */ 533 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 534 i = atoi(cp + sizeof("ndots:") - 1); 535 if (i <= RES_MAXNDOTS) 536 statp->ndots = i; 537 else 538 statp->ndots = RES_MAXNDOTS; 539 #ifdef DEBUG 540 if (statp->options & RES_DEBUG) 541 printf(";;\tndots=%d\n", statp->ndots); 542 #endif 543 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 544 i = atoi(cp + sizeof("timeout:") - 1); 545 if (i <= RES_MAXRETRANS) 546 statp->retrans = i; 547 else 548 statp->retrans = RES_MAXRETRANS; 549 #ifdef DEBUG 550 if (statp->options & RES_DEBUG) 551 printf(";;\ttimeout=%d\n", statp->retrans); 552 #endif 553 #ifdef SOLARIS2 554 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 555 /* 556 * For backward compatibility, 'retrans' is 557 * supported as an alias for 'timeout', though 558 * without an imposed maximum. 559 */ 560 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 561 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 562 /* 563 * For backward compatibility, 'retry' is 564 * supported as an alias for 'attempts', though 565 * without an imposed maximum. 566 */ 567 statp->retry = atoi(cp + sizeof("retry:") - 1); 568 #endif /* SOLARIS2 */ 569 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 570 i = atoi(cp + sizeof("attempts:") - 1); 571 if (i <= RES_MAXRETRY) 572 statp->retry = i; 573 else 574 statp->retry = RES_MAXRETRY; 575 #ifdef DEBUG 576 if (statp->options & RES_DEBUG) 577 printf(";;\tattempts=%d\n", statp->retry); 578 #endif 579 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 580 #ifdef DEBUG 581 if (!(statp->options & RES_DEBUG)) { 582 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 583 options, source); 584 statp->options |= RES_DEBUG; 585 } 586 printf(";;\tdebug\n"); 587 #endif 588 } else if (!strncmp(cp, "no_tld_query", 589 sizeof("no_tld_query") - 1) || 590 !strncmp(cp, "no-tld-query", 591 sizeof("no-tld-query") - 1)) { 592 statp->options |= RES_NOTLDQUERY; 593 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 594 statp->options |= RES_USE_INET6; 595 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 596 statp->options |= RES_ROTATE; 597 } else if (!strncmp(cp, "no-check-names", 598 sizeof("no-check-names") - 1)) { 599 statp->options |= RES_NOCHECKNAME; 600 } 601 #ifdef RES_USE_EDNS0 602 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 603 statp->options |= RES_USE_EDNS0; 604 } 605 #endif 606 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 607 statp->options |= RES_USE_DNAME; 608 } 609 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 610 if (ext == NULL) 611 goto skip; 612 cp += sizeof("nibble:") - 1; 613 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 614 strncpy(ext->nsuffix, cp, i); 615 ext->nsuffix[i] = '\0'; 616 } 617 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 618 if (ext == NULL) 619 goto skip; 620 cp += sizeof("nibble2:") - 1; 621 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 622 strncpy(ext->nsuffix2, cp, i); 623 ext->nsuffix2[i] = '\0'; 624 } 625 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 626 cp += sizeof("v6revmode:") - 1; 627 /* "nibble" and "bitstring" used to be valid */ 628 if (!strncmp(cp, "single", sizeof("single") - 1)) { 629 statp->options |= RES_NO_NIBBLE2; 630 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 631 statp->options &= 632 ~RES_NO_NIBBLE2; 633 } 634 } 635 else { 636 /* XXX - print a warning here? */ 637 } 638 skip: 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(in) /*!< XXX - should really use system's version of this */ 649 struct in_addr in; 650 { 651 register u_int32_t i = ntohl(in.s_addr); 652 653 if (IN_CLASSA(i)) 654 return (htonl(IN_CLASSA_NET)); 655 else if (IN_CLASSB(i)) 656 return (htonl(IN_CLASSB_NET)); 657 return (htonl(IN_CLASSC_NET)); 658 } 659 #endif 660 661 void 662 res_rndinit(res_state statp) 663 { 664 struct timeval now; 665 u_int32_t u32; 666 u_int16_t u16; 667 668 gettimeofday(&now, NULL); 669 u32 = now.tv_sec; 670 memcpy(statp->_rnd, &u32, 4); 671 u32 = now.tv_usec; 672 memcpy(statp->_rnd + 4, &u32, 4); 673 u32 += now.tv_sec; 674 memcpy(statp->_rnd + 8, &u32, 4); 675 u16 = getpid(); 676 memcpy(statp->_rnd + 12, &u16, 2); 677 } 678 679 u_int 680 res_nrandomid(res_state statp) { 681 struct timeval now; 682 u_int16_t u16; 683 MD5_CTX ctx; 684 685 gettimeofday(&now, NULL); 686 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 687 memcpy(statp->_rnd + 14, &u16, 2); 688 #ifndef HAVE_MD5 689 MD5_Init(&ctx); 690 MD5_Update(&ctx, statp->_rnd, 16); 691 MD5_Final(statp->_rnd, &ctx); 692 #else 693 MD5Init(&ctx); 694 MD5Update(&ctx, statp->_rnd, 16); 695 MD5Final(statp->_rnd, &ctx); 696 #endif 697 memcpy(&u16, statp->_rnd + 14, 2); 698 return ((u_int) u16); 699 } 700 701 /*% 702 * This routine is for closing the socket if a virtual circuit is used and 703 * the program wants to close it. This provides support for endhostent() 704 * which expects to close the socket. 705 * 706 * This routine is not expected to be user visible. 707 */ 708 void 709 res_nclose(res_state statp) { 710 int ns; 711 712 if (statp->_vcsock >= 0) { 713 (void) close(statp->_vcsock); 714 statp->_vcsock = -1; 715 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 716 } 717 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 718 if (statp->_u._ext.nssocks[ns] != -1) { 719 (void) close(statp->_u._ext.nssocks[ns]); 720 statp->_u._ext.nssocks[ns] = -1; 721 } 722 } 723 } 724 725 void 726 res_ndestroy(res_state statp) { 727 res_nclose(statp); 728 if (statp->_u._ext.ext != NULL) 729 free(statp->_u._ext.ext); 730 statp->options &= ~RES_INIT; 731 statp->_u._ext.ext = NULL; 732 } 733 734 const char * 735 res_get_nibblesuffix(res_state statp) { 736 if (statp->_u._ext.ext) 737 return (statp->_u._ext.ext->nsuffix); 738 return ("ip6.arpa"); 739 } 740 741 const char * 742 res_get_nibblesuffix2(res_state statp) { 743 if (statp->_u._ext.ext) 744 return (statp->_u._ext.ext->nsuffix2); 745 return ("ip6.int"); 746 } 747 748 void 749 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 750 int i, nserv; 751 size_t size; 752 753 /* close open servers */ 754 res_nclose(statp); 755 756 /* cause rtt times to be forgotten */ 757 statp->_u._ext.nscount = 0; 758 759 nserv = 0; 760 for (i = 0; i < cnt && nserv < MAXNS; i++) { 761 switch (set->sin.sin_family) { 762 case AF_INET: 763 size = sizeof(set->sin); 764 if (statp->_u._ext.ext) 765 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 766 &set->sin, size); 767 if (size <= sizeof(statp->nsaddr_list[nserv])) 768 memcpy(&statp->nsaddr_list[nserv], 769 &set->sin, size); 770 else 771 statp->nsaddr_list[nserv].sin_family = 0; 772 nserv++; 773 break; 774 775 #ifdef HAS_INET6_STRUCTS 776 case AF_INET6: 777 size = sizeof(set->sin6); 778 if (statp->_u._ext.ext) 779 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 780 &set->sin6, size); 781 if (size <= sizeof(statp->nsaddr_list[nserv])) 782 memcpy(&statp->nsaddr_list[nserv], 783 &set->sin6, size); 784 else 785 statp->nsaddr_list[nserv].sin_family = 0; 786 nserv++; 787 break; 788 #endif 789 790 default: 791 break; 792 } 793 set++; 794 } 795 statp->nscount = nserv; 796 797 } 798 799 int 800 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 801 int i; 802 size_t size; 803 u_int16_t family; 804 805 for (i = 0; i < statp->nscount && i < cnt; i++) { 806 if (statp->_u._ext.ext) 807 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 808 else 809 family = statp->nsaddr_list[i].sin_family; 810 811 switch (family) { 812 case AF_INET: 813 size = sizeof(set->sin); 814 if (statp->_u._ext.ext) 815 memcpy(&set->sin, 816 &statp->_u._ext.ext->nsaddrs[i], 817 size); 818 else 819 memcpy(&set->sin, &statp->nsaddr_list[i], 820 size); 821 break; 822 823 #ifdef HAS_INET6_STRUCTS 824 case AF_INET6: 825 size = sizeof(set->sin6); 826 if (statp->_u._ext.ext) 827 memcpy(&set->sin6, 828 &statp->_u._ext.ext->nsaddrs[i], 829 size); 830 else 831 memcpy(&set->sin6, &statp->nsaddr_list[i], 832 size); 833 break; 834 #endif 835 836 default: 837 set->sin.sin_family = 0; 838 break; 839 } 840 set++; 841 } 842 return (statp->nscount); 843 } 844 845 /*! \file */ 846