res_init.c revision 1.1.1.4
1 /* $NetBSD: res_init.c,v 1.1.1.4 2009/04/12 16:35:48 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 */ 55 56 /* 57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 59 * 60 * Permission to use, copy, modify, and distribute this software for any 61 * purpose with or without fee is hereby granted, provided that the above 62 * copyright notice and this permission notice appear in all copies. 63 * 64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #if defined(LIBC_SCCS) && !defined(lint) 74 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 75 static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp"; 76 #endif /* LIBC_SCCS and not lint */ 77 78 #include "port_before.h" 79 80 #include <sys/types.h> 81 #include <sys/param.h> 82 #include <sys/socket.h> 83 #include <sys/time.h> 84 85 #include <netinet/in.h> 86 #include <arpa/inet.h> 87 #include <arpa/nameser.h> 88 89 #include <ctype.h> 90 #include <stdio.h> 91 #include <stdlib.h> 92 #include <string.h> 93 #include <unistd.h> 94 #include <netdb.h> 95 96 #ifndef HAVE_MD5 97 # include "../dst/md5.h" 98 #else 99 # ifdef SOLARIS2 100 # include <sys/md5.h> 101 # endif 102 #endif 103 #ifndef _MD5_H_ 104 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 105 #endif 106 107 #include "port_after.h" 108 109 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 110 #include <resolv.h> 111 112 #include "res_private.h" 113 114 /*% Options. Should all be left alone. */ 115 #define RESOLVSORT 116 #define DEBUG 117 118 #ifdef SOLARIS2 119 #include <sys/systeminfo.h> 120 #endif 121 122 static void res_setoptions __P((res_state, const char *, const char *)); 123 124 #ifdef RESOLVSORT 125 static const char sort_mask[] = "/&"; 126 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 127 static u_int32_t net_mask __P((struct in_addr)); 128 #endif 129 130 #if !defined(isascii) /*%< XXX - could be a function */ 131 # define isascii(c) (!(c & 0200)) 132 #endif 133 134 /* 135 * Resolver state default settings. 136 */ 137 138 /*% 139 * Set up default settings. If the configuration file exist, the values 140 * there will have precedence. Otherwise, the server address is set to 141 * INADDR_ANY and the default domain name comes from the gethostname(). 142 * 143 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 144 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 145 * since it was noted that INADDR_ANY actually meant ``the first interface 146 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 147 * it had to be "up" in order for you to reach your own name server. It 148 * was later decided that since the recommended practice is to always 149 * install local static routes through 127.0.0.1 for all your network 150 * interfaces, that we could solve this problem without a code change. 151 * 152 * The configuration file should always be used, since it is the only way 153 * to specify a default domain. If you are running a server on your local 154 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 155 * in the configuration file. 156 * 157 * Return 0 if completes successfully, -1 on error 158 */ 159 int 160 res_ninit(res_state statp) { 161 extern int __res_vinit(res_state, int); 162 163 return (__res_vinit(statp, 0)); 164 } 165 166 /*% This function has to be reachable by res_data.c but not publically. */ 167 int 168 __res_vinit(res_state statp, int preinit) { 169 register FILE *fp; 170 register char *cp, **pp; 171 register int n; 172 char buf[BUFSIZ]; 173 int nserv = 0; /*%< number of nameserver records read from file */ 174 int haveenv = 0; 175 int havesearch = 0; 176 #ifdef RESOLVSORT 177 int nsort = 0; 178 char *net; 179 #endif 180 int dots; 181 union res_sockaddr_union u[2]; 182 int maxns = MAXNS; 183 184 RES_SET_H_ERRNO(statp, 0); 185 if (statp->_u._ext.ext != NULL) 186 res_ndestroy(statp); 187 188 if (!preinit) { 189 statp->retrans = RES_TIMEOUT; 190 statp->retry = RES_DFLRETRY; 191 statp->options = RES_DEFAULT; 192 res_rndinit(statp); 193 statp->id = res_nrandomid(statp); 194 } 195 196 memset(u, 0, sizeof(u)); 197 #ifdef USELOOPBACK 198 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 199 #else 200 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 201 #endif 202 u[nserv].sin.sin_family = AF_INET; 203 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 204 #ifdef HAVE_SA_LEN 205 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 206 #endif 207 nserv++; 208 #ifdef HAS_INET6_STRUCTS 209 #ifdef USELOOPBACK 210 u[nserv].sin6.sin6_addr = in6addr_loopback; 211 #else 212 u[nserv].sin6.sin6_addr = in6addr_any; 213 #endif 214 u[nserv].sin6.sin6_family = AF_INET6; 215 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 216 #ifdef HAVE_SA_LEN 217 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 218 #endif 219 nserv++; 220 #endif 221 statp->nscount = 0; 222 statp->ndots = 1; 223 statp->pfcode = 0; 224 statp->_vcsock = -1; 225 statp->_flags = 0; 226 statp->qhook = NULL; 227 statp->rhook = NULL; 228 statp->_u._ext.nscount = 0; 229 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 230 if (statp->_u._ext.ext != NULL) { 231 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 232 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 233 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 234 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 235 } else { 236 /* 237 * Historically res_init() rarely, if at all, failed. 238 * Examples and applications exist which do not check 239 * our return code. Furthermore several applications 240 * simply call us to get the systems domainname. So 241 * rather then immediately fail here we store the 242 * failure, which is returned later, in h_errno. And 243 * prevent the collection of 'nameserver' information 244 * by setting maxns to 0. Thus applications that fail 245 * to check our return code wont be able to make 246 * queries anyhow. 247 */ 248 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 249 maxns = 0; 250 } 251 #ifdef RESOLVSORT 252 statp->nsort = 0; 253 #endif 254 res_setservers(statp, u, nserv); 255 256 #ifdef SOLARIS2 257 /* 258 * The old libresolv derived the defaultdomain from NIS/NIS+. 259 * We want to keep this behaviour 260 */ 261 { 262 char buf[sizeof(statp->defdname)], *cp; 263 int ret; 264 265 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 266 (unsigned int)ret <= sizeof(buf)) { 267 if (buf[0] == '+') 268 buf[0] = '.'; 269 cp = strchr(buf, '.'); 270 cp = (cp == NULL) ? buf : (cp + 1); 271 strncpy(statp->defdname, cp, 272 sizeof(statp->defdname) - 1); 273 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 274 } 275 } 276 #endif /* SOLARIS2 */ 277 278 /* Allow user to override the local domain definition */ 279 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 280 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 281 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 282 haveenv++; 283 284 /* 285 * Set search list to be blank-separated strings 286 * from rest of env value. Permits users of LOCALDOMAIN 287 * to still have a search list, and anyone to set the 288 * one that they want to use as an individual (even more 289 * important now that the rfc1535 stuff restricts searches) 290 */ 291 cp = statp->defdname; 292 pp = statp->dnsrch; 293 *pp++ = cp; 294 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 295 if (*cp == '\n') /*%< silly backwards compat */ 296 break; 297 else if (*cp == ' ' || *cp == '\t') { 298 *cp = 0; 299 n = 1; 300 } else if (n) { 301 *pp++ = cp; 302 n = 0; 303 havesearch = 1; 304 } 305 } 306 /* null terminate last domain if there are excess */ 307 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 308 cp++; 309 *cp = '\0'; 310 *pp++ = 0; 311 } 312 313 #define MATCH(line, name) \ 314 (!strncmp(line, name, sizeof(name) - 1) && \ 315 (line[sizeof(name) - 1] == ' ' || \ 316 line[sizeof(name) - 1] == '\t')) 317 318 nserv = 0; 319 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 320 /* read the config file */ 321 while (fgets(buf, sizeof(buf), fp) != NULL) { 322 /* skip comments */ 323 if (*buf == ';' || *buf == '#') 324 continue; 325 /* read default domain name */ 326 if (MATCH(buf, "domain")) { 327 if (haveenv) /*%< skip if have from environ */ 328 continue; 329 cp = buf + sizeof("domain") - 1; 330 while (*cp == ' ' || *cp == '\t') 331 cp++; 332 if ((*cp == '\0') || (*cp == '\n')) 333 continue; 334 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 335 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 336 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 337 *cp = '\0'; 338 havesearch = 0; 339 continue; 340 } 341 /* set search list */ 342 if (MATCH(buf, "search")) { 343 if (haveenv) /*%< skip if have from environ */ 344 continue; 345 cp = buf + sizeof("search") - 1; 346 while (*cp == ' ' || *cp == '\t') 347 cp++; 348 if ((*cp == '\0') || (*cp == '\n')) 349 continue; 350 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 351 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 352 if ((cp = strchr(statp->defdname, '\n')) != NULL) 353 *cp = '\0'; 354 /* 355 * Set search list to be blank-separated strings 356 * on rest of line. 357 */ 358 cp = statp->defdname; 359 pp = statp->dnsrch; 360 *pp++ = cp; 361 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 362 if (*cp == ' ' || *cp == '\t') { 363 *cp = 0; 364 n = 1; 365 } else if (n) { 366 *pp++ = cp; 367 n = 0; 368 } 369 } 370 /* null terminate last domain if there are excess */ 371 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 372 cp++; 373 *cp = '\0'; 374 *pp++ = 0; 375 havesearch = 1; 376 continue; 377 } 378 /* read nameservers to query */ 379 if (MATCH(buf, "nameserver") && nserv < maxns) { 380 struct addrinfo hints, *ai; 381 char sbuf[NI_MAXSERV]; 382 const size_t minsiz = 383 sizeof(statp->_u._ext.ext->nsaddrs[0]); 384 385 cp = buf + sizeof("nameserver") - 1; 386 while (*cp == ' ' || *cp == '\t') 387 cp++; 388 cp[strcspn(cp, ";# \t\n")] = '\0'; 389 if ((*cp != '\0') && (*cp != '\n')) { 390 memset(&hints, 0, sizeof(hints)); 391 hints.ai_family = PF_UNSPEC; 392 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 393 hints.ai_flags = AI_NUMERICHOST; 394 sprintf(sbuf, "%u", NAMESERVER_PORT); 395 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 396 ai->ai_addrlen <= minsiz) { 397 if (statp->_u._ext.ext != NULL) { 398 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 399 ai->ai_addr, ai->ai_addrlen); 400 } 401 if (ai->ai_addrlen <= 402 sizeof(statp->nsaddr_list[nserv])) { 403 memcpy(&statp->nsaddr_list[nserv], 404 ai->ai_addr, ai->ai_addrlen); 405 } else 406 statp->nsaddr_list[nserv].sin_family = 0; 407 freeaddrinfo(ai); 408 nserv++; 409 } 410 } 411 continue; 412 } 413 #ifdef RESOLVSORT 414 if (MATCH(buf, "sortlist")) { 415 struct in_addr a; 416 417 cp = buf + sizeof("sortlist") - 1; 418 while (nsort < MAXRESOLVSORT) { 419 while (*cp == ' ' || *cp == '\t') 420 cp++; 421 if (*cp == '\0' || *cp == '\n' || *cp == ';') 422 break; 423 net = cp; 424 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 425 isascii(*cp) && !isspace((unsigned char)*cp)) 426 cp++; 427 n = *cp; 428 *cp = 0; 429 if (inet_aton(net, &a)) { 430 statp->sort_list[nsort].addr = a; 431 if (ISSORTMASK(n)) { 432 *cp++ = n; 433 net = cp; 434 while (*cp && *cp != ';' && 435 isascii(*cp) && 436 !isspace((unsigned char)*cp)) 437 cp++; 438 n = *cp; 439 *cp = 0; 440 if (inet_aton(net, &a)) { 441 statp->sort_list[nsort].mask = a.s_addr; 442 } else { 443 statp->sort_list[nsort].mask = 444 net_mask(statp->sort_list[nsort].addr); 445 } 446 } else { 447 statp->sort_list[nsort].mask = 448 net_mask(statp->sort_list[nsort].addr); 449 } 450 nsort++; 451 } 452 *cp = n; 453 } 454 continue; 455 } 456 #endif 457 if (MATCH(buf, "options")) { 458 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 459 continue; 460 } 461 } 462 if (nserv > 0) 463 statp->nscount = nserv; 464 #ifdef RESOLVSORT 465 statp->nsort = nsort; 466 #endif 467 (void) fclose(fp); 468 } 469 /* 470 * Last chance to get a nameserver. This should not normally 471 * be necessary 472 */ 473 #ifdef NO_RESOLV_CONF 474 if(nserv == 0) 475 nserv = get_nameservers(statp); 476 #endif 477 478 if (statp->defdname[0] == 0 && 479 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 480 (cp = strchr(buf, '.')) != NULL) 481 strcpy(statp->defdname, cp + 1); 482 483 /* find components of local domain that might be searched */ 484 if (havesearch == 0) { 485 pp = statp->dnsrch; 486 *pp++ = statp->defdname; 487 *pp = NULL; 488 489 dots = 0; 490 for (cp = statp->defdname; *cp; cp++) 491 dots += (*cp == '.'); 492 493 cp = statp->defdname; 494 while (pp < statp->dnsrch + MAXDFLSRCH) { 495 if (dots < LOCALDOMAINPARTS) 496 break; 497 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 498 *pp++ = cp; 499 dots--; 500 } 501 *pp = NULL; 502 #ifdef DEBUG 503 if (statp->options & RES_DEBUG) { 504 printf(";; res_init()... default dnsrch list:\n"); 505 for (pp = statp->dnsrch; *pp; pp++) 506 printf(";;\t%s\n", *pp); 507 printf(";;\t..END..\n"); 508 } 509 #endif 510 } 511 512 if ((cp = getenv("RES_OPTIONS")) != NULL) 513 res_setoptions(statp, cp, "env"); 514 statp->options |= RES_INIT; 515 return (statp->res_h_errno); 516 } 517 518 static void 519 res_setoptions(res_state statp, const char *options, const char *source) 520 { 521 const char *cp = options; 522 int i; 523 struct __res_state_ext *ext = statp->_u._ext.ext; 524 525 #ifdef DEBUG 526 if (statp->options & RES_DEBUG) 527 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 528 options, source); 529 #endif 530 while (*cp) { 531 /* skip leading and inner runs of spaces */ 532 while (*cp == ' ' || *cp == '\t') 533 cp++; 534 /* search for and process individual options */ 535 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 536 i = atoi(cp + sizeof("ndots:") - 1); 537 if (i <= RES_MAXNDOTS) 538 statp->ndots = i; 539 else 540 statp->ndots = RES_MAXNDOTS; 541 #ifdef DEBUG 542 if (statp->options & RES_DEBUG) 543 printf(";;\tndots=%d\n", statp->ndots); 544 #endif 545 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 546 i = atoi(cp + sizeof("timeout:") - 1); 547 if (i <= RES_MAXRETRANS) 548 statp->retrans = i; 549 else 550 statp->retrans = RES_MAXRETRANS; 551 #ifdef DEBUG 552 if (statp->options & RES_DEBUG) 553 printf(";;\ttimeout=%d\n", statp->retrans); 554 #endif 555 #ifdef SOLARIS2 556 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 557 /* 558 * For backward compatibility, 'retrans' is 559 * supported as an alias for 'timeout', though 560 * without an imposed maximum. 561 */ 562 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 563 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 564 /* 565 * For backward compatibility, 'retry' is 566 * supported as an alias for 'attempts', though 567 * without an imposed maximum. 568 */ 569 statp->retry = atoi(cp + sizeof("retry:") - 1); 570 #endif /* SOLARIS2 */ 571 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 572 i = atoi(cp + sizeof("attempts:") - 1); 573 if (i <= RES_MAXRETRY) 574 statp->retry = i; 575 else 576 statp->retry = RES_MAXRETRY; 577 #ifdef DEBUG 578 if (statp->options & RES_DEBUG) 579 printf(";;\tattempts=%d\n", statp->retry); 580 #endif 581 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 582 #ifdef DEBUG 583 if (!(statp->options & RES_DEBUG)) { 584 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 585 options, source); 586 statp->options |= RES_DEBUG; 587 } 588 printf(";;\tdebug\n"); 589 #endif 590 } else if (!strncmp(cp, "no_tld_query", 591 sizeof("no_tld_query") - 1) || 592 !strncmp(cp, "no-tld-query", 593 sizeof("no-tld-query") - 1)) { 594 statp->options |= RES_NOTLDQUERY; 595 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 596 statp->options |= RES_USE_INET6; 597 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 598 statp->options |= RES_ROTATE; 599 } else if (!strncmp(cp, "no-check-names", 600 sizeof("no-check-names") - 1)) { 601 statp->options |= RES_NOCHECKNAME; 602 } 603 #ifdef RES_USE_EDNS0 604 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 605 statp->options |= RES_USE_EDNS0; 606 } 607 #endif 608 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 609 statp->options |= RES_USE_DNAME; 610 } 611 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 612 if (ext == NULL) 613 goto skip; 614 cp += sizeof("nibble:") - 1; 615 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 616 strncpy(ext->nsuffix, cp, i); 617 ext->nsuffix[i] = '\0'; 618 } 619 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 620 if (ext == NULL) 621 goto skip; 622 cp += sizeof("nibble2:") - 1; 623 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 624 strncpy(ext->nsuffix2, cp, i); 625 ext->nsuffix2[i] = '\0'; 626 } 627 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 628 cp += sizeof("v6revmode:") - 1; 629 /* "nibble" and "bitstring" used to be valid */ 630 if (!strncmp(cp, "single", sizeof("single") - 1)) { 631 statp->options |= RES_NO_NIBBLE2; 632 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 633 statp->options &= 634 ~RES_NO_NIBBLE2; 635 } 636 } 637 else { 638 /* XXX - print a warning here? */ 639 } 640 skip: 641 /* skip to next run of spaces */ 642 while (*cp && *cp != ' ' && *cp != '\t') 643 cp++; 644 } 645 } 646 647 #ifdef RESOLVSORT 648 /* XXX - should really support CIDR which means explicit masks always. */ 649 static u_int32_t 650 net_mask(in) /*!< XXX - should really use system's version of this */ 651 struct in_addr in; 652 { 653 register u_int32_t i = ntohl(in.s_addr); 654 655 if (IN_CLASSA(i)) 656 return (htonl(IN_CLASSA_NET)); 657 else if (IN_CLASSB(i)) 658 return (htonl(IN_CLASSB_NET)); 659 return (htonl(IN_CLASSC_NET)); 660 } 661 #endif 662 663 void 664 res_rndinit(res_state statp) 665 { 666 struct timeval now; 667 u_int32_t u32; 668 u_int16_t u16; 669 670 gettimeofday(&now, NULL); 671 u32 = now.tv_sec; 672 memcpy(statp->_rnd, &u32, 4); 673 u32 = now.tv_usec; 674 memcpy(statp->_rnd + 4, &u32, 4); 675 u32 += now.tv_sec; 676 memcpy(statp->_rnd + 8, &u32, 4); 677 u16 = getpid(); 678 memcpy(statp->_rnd + 12, &u16, 2); 679 } 680 681 u_int 682 res_nrandomid(res_state statp) { 683 struct timeval now; 684 u_int16_t u16; 685 MD5_CTX ctx; 686 687 gettimeofday(&now, NULL); 688 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 689 memcpy(statp->_rnd + 14, &u16, 2); 690 #ifndef HAVE_MD5 691 MD5_Init(&ctx); 692 MD5_Update(&ctx, statp->_rnd, 16); 693 MD5_Final(statp->_rnd, &ctx); 694 #else 695 MD5Init(&ctx); 696 MD5Update(&ctx, statp->_rnd, 16); 697 MD5Final(statp->_rnd, &ctx); 698 #endif 699 memcpy(&u16, statp->_rnd + 14, 2); 700 return ((u_int) u16); 701 } 702 703 /*% 704 * This routine is for closing the socket if a virtual circuit is used and 705 * the program wants to close it. This provides support for endhostent() 706 * which expects to close the socket. 707 * 708 * This routine is not expected to be user visible. 709 */ 710 void 711 res_nclose(res_state statp) { 712 int ns; 713 714 if (statp->_vcsock >= 0) { 715 (void) close(statp->_vcsock); 716 statp->_vcsock = -1; 717 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 718 } 719 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 720 if (statp->_u._ext.nssocks[ns] != -1) { 721 (void) close(statp->_u._ext.nssocks[ns]); 722 statp->_u._ext.nssocks[ns] = -1; 723 } 724 } 725 } 726 727 void 728 res_ndestroy(res_state statp) { 729 res_nclose(statp); 730 if (statp->_u._ext.ext != NULL) 731 free(statp->_u._ext.ext); 732 statp->options &= ~RES_INIT; 733 statp->_u._ext.ext = NULL; 734 } 735 736 const char * 737 res_get_nibblesuffix(res_state statp) { 738 if (statp->_u._ext.ext) 739 return (statp->_u._ext.ext->nsuffix); 740 return ("ip6.arpa"); 741 } 742 743 const char * 744 res_get_nibblesuffix2(res_state statp) { 745 if (statp->_u._ext.ext) 746 return (statp->_u._ext.ext->nsuffix2); 747 return ("ip6.int"); 748 } 749 750 void 751 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 752 int i, nserv; 753 size_t size; 754 755 /* close open servers */ 756 res_nclose(statp); 757 758 /* cause rtt times to be forgotten */ 759 statp->_u._ext.nscount = 0; 760 761 nserv = 0; 762 for (i = 0; i < cnt && nserv < MAXNS; i++) { 763 switch (set->sin.sin_family) { 764 case AF_INET: 765 size = sizeof(set->sin); 766 if (statp->_u._ext.ext) 767 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 768 &set->sin, size); 769 if (size <= sizeof(statp->nsaddr_list[nserv])) 770 memcpy(&statp->nsaddr_list[nserv], 771 &set->sin, size); 772 else 773 statp->nsaddr_list[nserv].sin_family = 0; 774 nserv++; 775 break; 776 777 #ifdef HAS_INET6_STRUCTS 778 case AF_INET6: 779 size = sizeof(set->sin6); 780 if (statp->_u._ext.ext) 781 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 782 &set->sin6, size); 783 if (size <= sizeof(statp->nsaddr_list[nserv])) 784 memcpy(&statp->nsaddr_list[nserv], 785 &set->sin6, size); 786 else 787 statp->nsaddr_list[nserv].sin_family = 0; 788 nserv++; 789 break; 790 #endif 791 792 default: 793 break; 794 } 795 set++; 796 } 797 statp->nscount = nserv; 798 799 } 800 801 int 802 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 803 int i; 804 size_t size; 805 u_int16_t family; 806 807 for (i = 0; i < statp->nscount && i < cnt; i++) { 808 if (statp->_u._ext.ext) 809 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 810 else 811 family = statp->nsaddr_list[i].sin_family; 812 813 switch (family) { 814 case AF_INET: 815 size = sizeof(set->sin); 816 if (statp->_u._ext.ext) 817 memcpy(&set->sin, 818 &statp->_u._ext.ext->nsaddrs[i], 819 size); 820 else 821 memcpy(&set->sin, &statp->nsaddr_list[i], 822 size); 823 break; 824 825 #ifdef HAS_INET6_STRUCTS 826 case AF_INET6: 827 size = sizeof(set->sin6); 828 if (statp->_u._ext.ext) 829 memcpy(&set->sin6, 830 &statp->_u._ext.ext->nsaddrs[i], 831 size); 832 else 833 memcpy(&set->sin6, &statp->nsaddr_list[i], 834 size); 835 break; 836 #endif 837 838 default: 839 set->sin.sin_family = 0; 840 break; 841 } 842 set++; 843 } 844 return (statp->nscount); 845 } 846 847 /*! \file */ 848
Indexes created Tue Sep 23 23:09:58 GMT 2025