res_init.c revision 1.9
1 /* $NetBSD: res_init.c,v 1.9 2007/01/27 22:26:44 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 #include <sys/cdefs.h> 74 #if defined(LIBC_SCCS) && !defined(lint) 75 #ifdef notdef 76 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 77 static const char rcsid[] = "Id: res_init.c,v 1.16.18.5 2006/08/30 23:23:13 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_init.c,v 1.9 2007/01/27 22:26:44 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 85 #include "namespace.h" 86 #include <sys/types.h> 87 #include <sys/param.h> 88 #include <sys/socket.h> 89 #include <sys/time.h> 90 91 #include <netinet/in.h> 92 #include <arpa/inet.h> 93 #include <arpa/nameser.h> 94 95 #include <ctype.h> 96 #include <stdio.h> 97 #include <stdlib.h> 98 #include <string.h> 99 #include <unistd.h> 100 #include <netdb.h> 101 102 #include "port_after.h" 103 104 #if 0 105 #ifdef __weak_alias 106 __weak_alias(res_ninit,_res_ninit) 107 __weak_alias(res_randomid,__res_randomid) 108 __weak_alias(res_nclose,_res_nclose) 109 __weak_alias(res_ndestroy,_res_ndestroy) 110 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix) 111 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2) 112 __weak_alias(res_getservers,__res_getservers) 113 __weak_alias(res_setservers,__res_setservers) 114 #endif 115 #endif 116 117 118 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 119 #include <resolv.h> 120 121 #include "res_private.h" 122 123 /*% Options. Should all be left alone. */ 124 #define RESOLVSORT 125 #ifndef DEBUG 126 #define DEBUG 127 #endif 128 129 #ifdef SOLARIS2 130 #include <sys/systeminfo.h> 131 #endif 132 133 static void res_setoptions __P((res_state, const char *, const char *)); 134 135 static const char sort_mask[] = "/&"; 136 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 137 static u_int32_t net_mask __P((struct in_addr)); 138 139 #if !defined(isascii) /*%< XXX - could be a function */ 140 # define isascii(c) (!(c & 0200)) 141 #endif 142 143 /* 144 * Resolver state default settings. 145 */ 146 147 /*% 148 * Set up default settings. If the configuration file exist, the values 149 * there will have precedence. Otherwise, the server address is set to 150 * INADDR_ANY and the default domain name comes from the gethostname(). 151 * 152 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 153 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 154 * since it was noted that INADDR_ANY actually meant ``the first interface 155 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 156 * it had to be "up" in order for you to reach your own name server. It 157 * was later decided that since the recommended practice is to always 158 * install local static routes through 127.0.0.1 for all your network 159 * interfaces, that we could solve this problem without a code change. 160 * 161 * The configuration file should always be used, since it is the only way 162 * to specify a default domain. If you are running a server on your local 163 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 164 * in the configuration file. 165 * 166 * Return 0 if completes successfully, -1 on error 167 */ 168 int 169 res_ninit(res_state statp) { 170 extern int __res_vinit(res_state, int); 171 172 return (__res_vinit(statp, 0)); 173 } 174 175 /*% This function has to be reachable by res_data.c but not publically. */ 176 int 177 __res_vinit(res_state statp, int preinit) { 178 register FILE *fp; 179 register char *cp, **pp; 180 register int n; 181 char buf[BUFSIZ]; 182 int nserv = 0; /*%< number of nameserver records read from file */ 183 int haveenv = 0; 184 int havesearch = 0; 185 int nsort = 0; 186 char *net; 187 int dots; 188 union res_sockaddr_union u[2]; 189 190 if (statp->_u._ext.ext != NULL) 191 res_ndestroy(statp); 192 193 if (!preinit) { 194 statp->retrans = RES_TIMEOUT; 195 statp->retry = RES_DFLRETRY; 196 statp->options = RES_DEFAULT; 197 statp->id = res_randomid(); 198 } 199 200 memset(u, 0, sizeof(u)); 201 #ifdef USELOOPBACK 202 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 203 #else 204 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 205 #endif 206 u[nserv].sin.sin_family = AF_INET; 207 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 208 #ifdef HAVE_SA_LEN 209 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 210 #endif 211 nserv++; 212 #ifdef HAS_INET6_STRUCTS 213 #ifdef USELOOPBACK 214 u[nserv].sin6.sin6_addr = in6addr_loopback; 215 #else 216 u[nserv].sin6.sin6_addr = in6addr_any; 217 #endif 218 u[nserv].sin6.sin6_family = AF_INET6; 219 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 220 #ifdef HAVE_SA_LEN 221 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 222 #endif 223 nserv++; 224 #endif 225 statp->nscount = 0; 226 statp->ndots = 1; 227 statp->pfcode = 0; 228 statp->_vcsock = -1; 229 statp->_flags = 0; 230 statp->qhook = NULL; 231 statp->rhook = NULL; 232 statp->_u._ext.nscount = 0; 233 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 234 if (statp->_u._ext.ext != NULL) { 235 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 236 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 237 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 238 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 239 } else 240 return (-1); 241 #ifdef RESOLVSORT 242 statp->nsort = 0; 243 res_setservers(statp, u, nserv); 244 245 #ifdef SOLARIS2 246 /* 247 * The old libresolv derived the defaultdomain from NIS/NIS+. 248 * We want to keep this behaviour 249 */ 250 { 251 char buf[sizeof(statp->defdname)], *cp; 252 int ret; 253 254 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 255 (unsigned int)ret <= sizeof(buf)) { 256 if (buf[0] == '+') 257 buf[0] = '.'; 258 cp = strchr(buf, '.'); 259 cp = (cp == NULL) ? buf : (cp + 1); 260 if (strlen(cp) >= sizeof(statp->defdname)) 261 goto freedata; 262 strcpy(statp->defdname, cp); 263 } 264 } 265 #endif /* SOLARIS2 */ 266 267 /* Allow user to override the local domain definition */ 268 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 269 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 270 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 271 haveenv++; 272 273 /* 274 * Set search list to be blank-separated strings 275 * from rest of env value. Permits users of LOCALDOMAIN 276 * to still have a search list, and anyone to set the 277 * one that they want to use as an individual (even more 278 * important now that the rfc1535 stuff restricts searches) 279 */ 280 cp = statp->defdname; 281 pp = statp->dnsrch; 282 *pp++ = cp; 283 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 284 if (*cp == '\n') /*%< silly backwards compat */ 285 break; 286 else if (*cp == ' ' || *cp == '\t') { 287 *cp = 0; 288 n = 1; 289 } else if (n) { 290 *pp++ = cp; 291 n = 0; 292 havesearch = 1; 293 } 294 } 295 /* null terminate last domain if there are excess */ 296 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 297 cp++; 298 *cp = '\0'; 299 *pp++ = 0; 300 } 301 302 #define MATCH(line, name) \ 303 (!strncmp(line, name, sizeof(name) - 1) && \ 304 (line[sizeof(name) - 1] == ' ' || \ 305 line[sizeof(name) - 1] == '\t')) 306 307 nserv = 0; 308 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 309 /* read the config file */ 310 while (fgets(buf, sizeof(buf), fp) != NULL) { 311 /* skip comments */ 312 if (*buf == ';' || *buf == '#') 313 continue; 314 /* read default domain name */ 315 if (MATCH(buf, "domain")) { 316 if (haveenv) /*%< skip if have from environ */ 317 continue; 318 cp = buf + sizeof("domain") - 1; 319 while (*cp == ' ' || *cp == '\t') 320 cp++; 321 if ((*cp == '\0') || (*cp == '\n')) 322 continue; 323 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 324 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 325 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 326 *cp = '\0'; 327 havesearch = 0; 328 continue; 329 } 330 /* set search list */ 331 if (MATCH(buf, "search")) { 332 if (haveenv) /*%< skip if have from environ */ 333 continue; 334 cp = buf + sizeof("search") - 1; 335 while (*cp == ' ' || *cp == '\t') 336 cp++; 337 if ((*cp == '\0') || (*cp == '\n')) 338 continue; 339 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 340 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 341 if ((cp = strchr(statp->defdname, '\n')) != NULL) 342 *cp = '\0'; 343 /* 344 * Set search list to be blank-separated strings 345 * on rest of line. 346 */ 347 cp = statp->defdname; 348 pp = statp->dnsrch; 349 *pp++ = cp; 350 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 351 if (*cp == ' ' || *cp == '\t') { 352 *cp = 0; 353 n = 1; 354 } else if (n) { 355 *pp++ = cp; 356 n = 0; 357 } 358 } 359 /* null terminate last domain if there are excess */ 360 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 361 cp++; 362 *cp = '\0'; 363 *pp++ = 0; 364 havesearch = 1; 365 continue; 366 } 367 /* read nameservers to query */ 368 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 369 struct addrinfo hints, *ai; 370 char sbuf[NI_MAXSERV]; 371 const size_t minsiz = 372 sizeof(statp->_u._ext.ext->nsaddrs[0]); 373 374 cp = buf + sizeof("nameserver") - 1; 375 while (*cp == ' ' || *cp == '\t') 376 cp++; 377 cp[strcspn(cp, ";# \t\n")] = '\0'; 378 if ((*cp != '\0') && (*cp != '\n')) { 379 memset(&hints, 0, sizeof(hints)); 380 hints.ai_family = PF_UNSPEC; 381 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 382 hints.ai_flags = AI_NUMERICHOST; 383 sprintf(sbuf, "%u", NAMESERVER_PORT); 384 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 385 ai->ai_addrlen <= minsiz) { 386 if (statp->_u._ext.ext != NULL) { 387 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 388 ai->ai_addr, ai->ai_addrlen); 389 } 390 if (ai->ai_addrlen <= 391 sizeof(statp->nsaddr_list[nserv])) { 392 memcpy(&statp->nsaddr_list[nserv], 393 ai->ai_addr, ai->ai_addrlen); 394 } else 395 statp->nsaddr_list[nserv].sin_family = 0; 396 freeaddrinfo(ai); 397 nserv++; 398 } 399 } 400 continue; 401 } 402 if (MATCH(buf, "sortlist")) { 403 struct in_addr a; 404 405 cp = buf + sizeof("sortlist") - 1; 406 while (nsort < MAXRESOLVSORT) { 407 while (*cp == ' ' || *cp == '\t') 408 cp++; 409 if (*cp == '\0' || *cp == '\n' || *cp == ';') 410 break; 411 net = cp; 412 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 413 isascii(*cp) && !isspace((unsigned char)*cp)) 414 cp++; 415 n = *cp; 416 *cp = 0; 417 if (inet_aton(net, &a)) { 418 statp->sort_list[nsort].addr = a; 419 if (ISSORTMASK(n)) { 420 *cp++ = n; 421 net = cp; 422 while (*cp && *cp != ';' && 423 isascii(*cp) && 424 !isspace((unsigned char)*cp)) 425 cp++; 426 n = *cp; 427 *cp = 0; 428 if (inet_aton(net, &a)) { 429 statp->sort_list[nsort].mask = a.s_addr; 430 } else { 431 statp->sort_list[nsort].mask = 432 net_mask(statp->sort_list[nsort].addr); 433 } 434 } else { 435 statp->sort_list[nsort].mask = 436 net_mask(statp->sort_list[nsort].addr); 437 } 438 nsort++; 439 } 440 *cp = n; 441 } 442 continue; 443 } 444 if (MATCH(buf, "options")) { 445 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 446 continue; 447 } 448 } 449 if (nserv > 0) 450 statp->nscount = nserv; 451 statp->nsort = nsort; 452 (void) fclose(fp); 453 } 454 /* 455 * Last chance to get a nameserver. This should not normally 456 * be necessary 457 */ 458 #ifdef NO_RESOLV_CONF 459 if(nserv == 0) 460 nserv = get_nameservers(statp); 461 #endif 462 463 if (statp->defdname[0] == 0 && 464 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 465 (cp = strchr(buf, '.')) != NULL) 466 strcpy(statp->defdname, cp + 1); 467 468 /* find components of local domain that might be searched */ 469 if (havesearch == 0) { 470 pp = statp->dnsrch; 471 *pp++ = statp->defdname; 472 *pp = NULL; 473 474 dots = 0; 475 for (cp = statp->defdname; *cp; cp++) 476 dots += (*cp == '.'); 477 478 cp = statp->defdname; 479 while (pp < statp->dnsrch + MAXDFLSRCH) { 480 if (dots < LOCALDOMAINPARTS) 481 break; 482 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 483 *pp++ = cp; 484 dots--; 485 } 486 *pp = NULL; 487 #ifdef DEBUG 488 if (statp->options & RES_DEBUG) { 489 printf(";; res_init()... default dnsrch list:\n"); 490 for (pp = statp->dnsrch; *pp; pp++) 491 printf(";;\t%s\n", *pp); 492 printf(";;\t..END..\n"); 493 } 494 #endif 495 } 496 497 if ((cp = getenv("RES_OPTIONS")) != NULL) 498 res_setoptions(statp, cp, "env"); 499 statp->options |= RES_INIT; 500 return (0); 501 502 #ifdef SOLARIS2 503 freedata: 504 if (statp->_u._ext.ext != NULL) { 505 free(statp->_u._ext.ext); 506 statp->_u._ext.ext = NULL; 507 } 508 return (-1); 509 #endif 510 } 511 512 static void 513 res_setoptions(res_state statp, const char *options, const char *source) 514 { 515 const char *cp = options; 516 int i; 517 struct __res_state_ext *ext = statp->_u._ext.ext; 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 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 603 statp->options |= RES_USE_DNAME; 604 } 605 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 606 if (ext == NULL) 607 goto skip; 608 cp += sizeof("nibble:") - 1; 609 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 610 strncpy(ext->nsuffix, cp, (size_t)i); 611 ext->nsuffix[i] = '\0'; 612 } 613 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 614 if (ext == NULL) 615 goto skip; 616 cp += sizeof("nibble2:") - 1; 617 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 618 strncpy(ext->nsuffix2, cp, (size_t)i); 619 ext->nsuffix2[i] = '\0'; 620 } 621 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 622 cp += sizeof("v6revmode:") - 1; 623 /* "nibble" and "bitstring" used to be valid */ 624 if (!strncmp(cp, "single", sizeof("single") - 1)) { 625 statp->options |= RES_NO_NIBBLE2; 626 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 627 statp->options &= 628 ~RES_NO_NIBBLE2; 629 } 630 } 631 else { 632 /* XXX - print a warning here? */ 633 } 634 skip: 635 /* skip to next run of spaces */ 636 while (*cp && *cp != ' ' && *cp != '\t') 637 cp++; 638 } 639 } 640 641 /* XXX - should really support CIDR which means explicit masks always. */ 642 static u_int32_t 643 net_mask(in) /*!< XXX - should really use system's version of this */ 644 struct in_addr in; 645 { 646 register u_int32_t i = ntohl(in.s_addr); 647 648 if (IN_CLASSA(i)) 649 return (htonl(IN_CLASSA_NET)); 650 else if (IN_CLASSB(i)) 651 return (htonl(IN_CLASSB_NET)); 652 return (htonl(IN_CLASSC_NET)); 653 } 654 655 u_int 656 res_randomid(void) { 657 struct timeval now; 658 659 gettimeofday(&now, NULL); 660 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 661 } 662 663 /*% 664 * This routine is for closing the socket if a virtual circuit is used and 665 * the program wants to close it. This provides support for endhostent() 666 * which expects to close the socket. 667 * 668 * This routine is not expected to be user visible. 669 */ 670 void 671 res_nclose(res_state statp) { 672 int ns; 673 674 if (statp->_vcsock >= 0) { 675 (void) close(statp->_vcsock); 676 statp->_vcsock = -1; 677 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 678 } 679 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 680 if (statp->_u._ext.nssocks[ns] != -1) { 681 (void) close(statp->_u._ext.nssocks[ns]); 682 statp->_u._ext.nssocks[ns] = -1; 683 } 684 } 685 } 686 687 void 688 res_ndestroy(res_state statp) { 689 res_nclose(statp); 690 if (statp->_u._ext.ext != NULL) 691 free(statp->_u._ext.ext); 692 statp->options &= ~RES_INIT; 693 statp->_u._ext.ext = NULL; 694 } 695 696 const char * 697 res_get_nibblesuffix(res_state statp) { 698 if (statp->_u._ext.ext) 699 return (statp->_u._ext.ext->nsuffix); 700 return ("ip6.arpa"); 701 } 702 703 const char * 704 res_get_nibblesuffix2(res_state statp) { 705 if (statp->_u._ext.ext) 706 return (statp->_u._ext.ext->nsuffix2); 707 return ("ip6.int"); 708 } 709 710 void 711 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 712 int i, nserv; 713 size_t size; 714 715 /* close open servers */ 716 res_nclose(statp); 717 718 /* cause rtt times to be forgotten */ 719 statp->_u._ext.nscount = 0; 720 721 nserv = 0; 722 for (i = 0; i < cnt && nserv < MAXNS; i++) { 723 switch (set->sin.sin_family) { 724 case AF_INET: 725 size = sizeof(set->sin); 726 if (statp->_u._ext.ext) 727 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 728 &set->sin, size); 729 if (size <= sizeof(statp->nsaddr_list[nserv])) 730 memcpy(&statp->nsaddr_list[nserv], 731 &set->sin, size); 732 #ifdef notdef 733 else 734 statp->nsaddr_list[nserv].sin_family = 0; 735 #endif 736 nserv++; 737 break; 738 739 #ifdef HAS_INET6_STRUCTS 740 case AF_INET6: 741 size = sizeof(set->sin6); 742 if (statp->_u._ext.ext) 743 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 744 &set->sin6, size); 745 if (size <= sizeof(statp->nsaddr_list[nserv])) 746 memcpy(&statp->nsaddr_list[nserv], 747 &set->sin6, size); 748 else 749 statp->nsaddr_list[nserv].sin_family = 0; 750 nserv++; 751 break; 752 #endif 753 754 default: 755 break; 756 } 757 set++; 758 } 759 statp->nscount = nserv; 760 761 } 762 763 int 764 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 765 int i; 766 size_t size; 767 u_int16_t family; 768 769 for (i = 0; i < statp->nscount && i < cnt; i++) { 770 if (statp->_u._ext.ext) 771 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 772 else 773 family = statp->nsaddr_list[i].sin_family; 774 775 switch (family) { 776 case AF_INET: 777 size = sizeof(set->sin); 778 if (statp->_u._ext.ext) 779 memcpy(&set->sin, 780 &statp->_u._ext.ext->nsaddrs[i], 781 size); 782 else 783 memcpy(&set->sin, &statp->nsaddr_list[i], 784 size); 785 break; 786 787 #ifdef HAS_INET6_STRUCTS 788 case AF_INET6: 789 size = sizeof(set->sin6); 790 if (statp->_u._ext.ext) 791 memcpy(&set->sin6, 792 &statp->_u._ext.ext->nsaddrs[i], 793 size); 794 else 795 memcpy(&set->sin6, &statp->nsaddr_list[i], 796 size); 797 break; 798 #endif 799 800 default: 801 set->sin.sin_family = 0; 802 break; 803 } 804 set++; 805 } 806 return (statp->nscount); 807 } 808 809 /*! \file */ 810
Indexes created Tue Sep 23 02:09:52 GMT 2025