res_init.c revision 1.5
1 /* $NetBSD: res_init.c,v 1.5 2004/05/21 16:03:05 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 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_init.c,v 1.5 2004/05/21 16:03:05 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 #define DEBUG 126 127 static void res_setoptions __P((res_state, const char *, const char *)); 128 129 #ifdef RESOLVSORT 130 static const char sort_mask[] = "/&"; 131 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 132 static u_int32_t net_mask __P((struct in_addr)); 133 #endif 134 135 #if !defined(isascii) /* XXX - could be a function */ 136 # define isascii(c) (!(c & 0200)) 137 #endif 138 139 /* 140 * Resolver state default settings. 141 */ 142 143 /* 144 * Set up default settings. If the configuration file exist, the values 145 * there will have precedence. Otherwise, the server address is set to 146 * INADDR_ANY and the default domain name comes from the gethostname(). 147 * 148 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 149 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 150 * since it was noted that INADDR_ANY actually meant ``the first interface 151 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 152 * it had to be "up" in order for you to reach your own name server. It 153 * was later decided that since the recommended practice is to always 154 * install local static routes through 127.0.0.1 for all your network 155 * interfaces, that we could solve this problem without a code change. 156 * 157 * The configuration file should always be used, since it is the only way 158 * to specify a default domain. If you are running a server on your local 159 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 160 * in the configuration file. 161 * 162 * Return 0 if completes successfully, -1 on error 163 */ 164 int 165 res_ninit(res_state statp) { 166 extern int __res_vinit(res_state, int); 167 168 return (__res_vinit(statp, 0)); 169 } 170 171 /* This function has to be reachable by res_data.c but not publically. */ 172 int 173 __res_vinit(res_state statp, int preinit) { 174 register FILE *fp; 175 register char *cp, **pp; 176 register int n; 177 char buf[BUFSIZ]; 178 int nserv = 0; /* number of nameserver records read from file */ 179 int haveenv = 0; 180 int havesearch = 0; 181 #ifdef RESOLVSORT 182 int nsort = 0; 183 char *net; 184 #endif 185 int dots; 186 union res_sockaddr_union u[2]; 187 188 if (!preinit) { 189 statp->retrans = RES_TIMEOUT; 190 statp->retry = RES_DFLRETRY; 191 statp->options = RES_DEFAULT; 192 statp->id = res_randomid(); 193 } 194 195 if ((statp->options & RES_INIT) != 0U) 196 res_ndestroy(statp); 197 198 memset(u, 0, sizeof(u)); 199 #ifdef USELOOPBACK 200 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 201 #else 202 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 203 #endif 204 u[nserv].sin.sin_family = AF_INET; 205 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 206 #ifdef HAVE_SA_LEN 207 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 208 #endif 209 nserv++; 210 #ifdef HAS_INET6_STRUCTS 211 #ifdef USELOOPBACK 212 u[nserv].sin6.sin6_addr = in6addr_loopback; 213 #else 214 u[nserv].sin6.sin6_addr = in6addr_any; 215 #endif 216 u[nserv].sin6.sin6_family = AF_INET6; 217 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 218 #ifdef HAVE_SA_LEN 219 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 220 #endif 221 nserv++; 222 #endif 223 statp->nscount = 0; 224 statp->ndots = 1; 225 statp->pfcode = 0; 226 statp->_vcsock = -1; 227 statp->_flags = 0; 228 statp->qhook = NULL; 229 statp->rhook = NULL; 230 statp->_u._ext.nscount = 0; 231 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 232 if (statp->_u._ext.ext != NULL) { 233 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 234 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 235 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 236 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 237 } 238 #ifdef RESOLVSORT 239 statp->nsort = 0; 240 #endif 241 res_setservers(statp, u, nserv); 242 243 /* Allow user to override the local domain definition */ 244 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 245 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 246 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 247 haveenv++; 248 249 /* 250 * Set search list to be blank-separated strings 251 * from rest of env value. Permits users of LOCALDOMAIN 252 * to still have a search list, and anyone to set the 253 * one that they want to use as an individual (even more 254 * important now that the rfc1535 stuff restricts searches) 255 */ 256 cp = statp->defdname; 257 pp = statp->dnsrch; 258 *pp++ = cp; 259 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 260 if (*cp == '\n') /* silly backwards compat */ 261 break; 262 else if (*cp == ' ' || *cp == '\t') { 263 *cp = 0; 264 n = 1; 265 } else if (n) { 266 *pp++ = cp; 267 n = 0; 268 havesearch = 1; 269 } 270 } 271 /* null terminate last domain if there are excess */ 272 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 273 cp++; 274 *cp = '\0'; 275 *pp++ = 0; 276 } 277 278 #define MATCH(line, name) \ 279 (!strncmp(line, name, sizeof(name) - 1) && \ 280 (line[sizeof(name) - 1] == ' ' || \ 281 line[sizeof(name) - 1] == '\t')) 282 283 nserv = 0; 284 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 285 /* read the config file */ 286 while (fgets(buf, sizeof(buf), fp) != NULL) { 287 /* skip comments */ 288 if (*buf == ';' || *buf == '#') 289 continue; 290 /* read default domain name */ 291 if (MATCH(buf, "domain")) { 292 if (haveenv) /* skip if have from environ */ 293 continue; 294 cp = buf + sizeof("domain") - 1; 295 while (*cp == ' ' || *cp == '\t') 296 cp++; 297 if ((*cp == '\0') || (*cp == '\n')) 298 continue; 299 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 300 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 301 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 302 *cp = '\0'; 303 havesearch = 0; 304 continue; 305 } 306 /* set search list */ 307 if (MATCH(buf, "search")) { 308 if (haveenv) /* skip if have from environ */ 309 continue; 310 cp = buf + sizeof("search") - 1; 311 while (*cp == ' ' || *cp == '\t') 312 cp++; 313 if ((*cp == '\0') || (*cp == '\n')) 314 continue; 315 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 316 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 317 if ((cp = strchr(statp->defdname, '\n')) != NULL) 318 *cp = '\0'; 319 /* 320 * Set search list to be blank-separated strings 321 * on rest of line. 322 */ 323 cp = statp->defdname; 324 pp = statp->dnsrch; 325 *pp++ = cp; 326 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 327 if (*cp == ' ' || *cp == '\t') { 328 *cp = 0; 329 n = 1; 330 } else if (n) { 331 *pp++ = cp; 332 n = 0; 333 } 334 } 335 /* null terminate last domain if there are excess */ 336 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 337 cp++; 338 *cp = '\0'; 339 *pp++ = 0; 340 havesearch = 1; 341 continue; 342 } 343 /* read nameservers to query */ 344 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 345 struct addrinfo hints, *ai; 346 char sbuf[NI_MAXSERV]; 347 const size_t minsiz = 348 sizeof(statp->_u._ext.ext->nsaddrs[0]); 349 350 cp = buf + sizeof("nameserver") - 1; 351 while (*cp == ' ' || *cp == '\t') 352 cp++; 353 cp[strcspn(cp, ";# \t\n")] = '\0'; 354 if ((*cp != '\0') && (*cp != '\n')) { 355 memset(&hints, 0, sizeof(hints)); 356 hints.ai_family = PF_UNSPEC; 357 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 358 hints.ai_flags = AI_NUMERICHOST; 359 sprintf(sbuf, "%u", NAMESERVER_PORT); 360 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 361 ai->ai_addrlen <= minsiz) { 362 if (statp->_u._ext.ext != NULL) { 363 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 364 ai->ai_addr, ai->ai_addrlen); 365 } 366 if (ai->ai_addrlen <= 367 sizeof(statp->nsaddr_list[nserv])) { 368 memcpy(&statp->nsaddr_list[nserv], 369 ai->ai_addr, ai->ai_addrlen); 370 } else 371 statp->nsaddr_list[nserv].sin_family = 0; 372 freeaddrinfo(ai); 373 nserv++; 374 } 375 } 376 continue; 377 } 378 #ifdef RESOLVSORT 379 if (MATCH(buf, "sortlist")) { 380 struct in_addr a; 381 382 cp = buf + sizeof("sortlist") - 1; 383 while (nsort < MAXRESOLVSORT) { 384 while (*cp == ' ' || *cp == '\t') 385 cp++; 386 if (*cp == '\0' || *cp == '\n' || *cp == ';') 387 break; 388 net = cp; 389 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 390 isascii(*cp) && !isspace((unsigned char)*cp)) 391 cp++; 392 n = *cp; 393 *cp = 0; 394 if (inet_aton(net, &a)) { 395 statp->sort_list[nsort].addr = a; 396 if (ISSORTMASK(n)) { 397 *cp++ = n; 398 net = cp; 399 while (*cp && *cp != ';' && 400 isascii(*cp) && 401 !isspace((unsigned char)*cp)) 402 cp++; 403 n = *cp; 404 *cp = 0; 405 if (inet_aton(net, &a)) { 406 statp->sort_list[nsort].mask = a.s_addr; 407 } else { 408 statp->sort_list[nsort].mask = 409 net_mask(statp->sort_list[nsort].addr); 410 } 411 } else { 412 statp->sort_list[nsort].mask = 413 net_mask(statp->sort_list[nsort].addr); 414 } 415 nsort++; 416 } 417 *cp = n; 418 } 419 continue; 420 } 421 #endif 422 if (MATCH(buf, "options")) { 423 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 424 continue; 425 } 426 } 427 if (nserv > 0) 428 statp->nscount = nserv; 429 #ifdef RESOLVSORT 430 statp->nsort = nsort; 431 #endif 432 (void) fclose(fp); 433 } 434 /* 435 * Last chance to get a nameserver. This should not normally 436 * be necessary 437 */ 438 #ifdef NO_RESOLV_CONF 439 if(nserv == 0) 440 nserv = get_nameservers(statp); 441 #endif 442 443 if (statp->defdname[0] == 0 && 444 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 445 (cp = strchr(buf, '.')) != NULL) 446 strcpy(statp->defdname, cp + 1); 447 448 /* find components of local domain that might be searched */ 449 if (havesearch == 0) { 450 pp = statp->dnsrch; 451 *pp++ = statp->defdname; 452 *pp = NULL; 453 454 dots = 0; 455 for (cp = statp->defdname; *cp; cp++) 456 dots += (*cp == '.'); 457 458 cp = statp->defdname; 459 while (pp < statp->dnsrch + MAXDFLSRCH) { 460 if (dots < LOCALDOMAINPARTS) 461 break; 462 cp = strchr(cp, '.') + 1; /* we know there is one */ 463 *pp++ = cp; 464 dots--; 465 } 466 *pp = NULL; 467 #ifdef DEBUG 468 if (statp->options & RES_DEBUG) { 469 printf(";; res_init()... default dnsrch list:\n"); 470 for (pp = statp->dnsrch; *pp; pp++) 471 printf(";;\t%s\n", *pp); 472 printf(";;\t..END..\n"); 473 } 474 #endif 475 } 476 477 if ((cp = getenv("RES_OPTIONS")) != NULL) 478 res_setoptions(statp, cp, "env"); 479 statp->options |= RES_INIT; 480 return (0); 481 } 482 483 static void 484 res_setoptions(res_state statp, const char *options, const char *source) 485 { 486 const char *cp = options; 487 int i; 488 struct __res_state_ext *ext = statp->_u._ext.ext; 489 490 #ifdef DEBUG 491 if (statp->options & RES_DEBUG) 492 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 493 options, source); 494 #endif 495 while (*cp) { 496 /* skip leading and inner runs of spaces */ 497 while (*cp == ' ' || *cp == '\t') 498 cp++; 499 /* search for and process individual options */ 500 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 501 i = atoi(cp + sizeof("ndots:") - 1); 502 if (i <= RES_MAXNDOTS) 503 statp->ndots = i; 504 else 505 statp->ndots = RES_MAXNDOTS; 506 #ifdef DEBUG 507 if (statp->options & RES_DEBUG) 508 printf(";;\tndots=%d\n", statp->ndots); 509 #endif 510 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 511 i = atoi(cp + sizeof("timeout:") - 1); 512 if (i <= RES_MAXRETRANS) 513 statp->retrans = i; 514 else 515 statp->retrans = RES_MAXRETRANS; 516 #ifdef DEBUG 517 if (statp->options & RES_DEBUG) 518 printf(";;\ttimeout=%d\n", statp->retrans); 519 #endif 520 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 521 i = atoi(cp + sizeof("attempts:") - 1); 522 if (i <= RES_MAXRETRY) 523 statp->retry = i; 524 else 525 statp->retry = RES_MAXRETRY; 526 #ifdef DEBUG 527 if (statp->options & RES_DEBUG) 528 printf(";;\tattempts=%d\n", statp->retry); 529 #endif 530 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 531 #ifdef DEBUG 532 if (!(statp->options & RES_DEBUG)) { 533 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 534 options, source); 535 statp->options |= RES_DEBUG; 536 } 537 printf(";;\tdebug\n"); 538 #endif 539 } else if (!strncmp(cp, "no_tld_query", 540 sizeof("no_tld_query") - 1) || 541 !strncmp(cp, "no-tld-query", 542 sizeof("no-tld-query") - 1)) { 543 statp->options |= RES_NOTLDQUERY; 544 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 545 statp->options |= RES_USE_INET6; 546 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 547 statp->options |= RES_ROTATE; 548 } else if (!strncmp(cp, "no-check-names", 549 sizeof("no-check-names") - 1)) { 550 statp->options |= RES_NOCHECKNAME; 551 } 552 #ifdef RES_USE_EDNS0 553 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 554 statp->options |= RES_USE_EDNS0; 555 } 556 #endif 557 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 558 statp->options |= RES_USE_DNAME; 559 } 560 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 561 if (ext == NULL) 562 goto skip; 563 cp += sizeof("nibble:") - 1; 564 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 565 strncpy(ext->nsuffix, cp, (size_t)i); 566 ext->nsuffix[i] = '\0'; 567 } 568 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 569 if (ext == NULL) 570 goto skip; 571 cp += sizeof("nibble2:") - 1; 572 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 573 strncpy(ext->nsuffix2, cp, (size_t)i); 574 ext->nsuffix2[i] = '\0'; 575 } 576 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 577 cp += sizeof("v6revmode:") - 1; 578 /* "nibble" and "bitstring" used to be valid */ 579 if (!strncmp(cp, "single", sizeof("single") - 1)) { 580 statp->options |= RES_NO_NIBBLE2; 581 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 582 statp->options &= 583 ~RES_NO_NIBBLE2; 584 } 585 } 586 else { 587 /* XXX - print a warning here? */ 588 } 589 skip: 590 /* skip to next run of spaces */ 591 while (*cp && *cp != ' ' && *cp != '\t') 592 cp++; 593 } 594 } 595 596 #ifdef RESOLVSORT 597 /* XXX - should really support CIDR which means explicit masks always. */ 598 static u_int32_t 599 net_mask(in) /* XXX - should really use system's version of this */ 600 struct in_addr in; 601 { 602 register u_int32_t i = ntohl(in.s_addr); 603 604 if (IN_CLASSA(i)) 605 return (htonl(IN_CLASSA_NET)); 606 else if (IN_CLASSB(i)) 607 return (htonl(IN_CLASSB_NET)); 608 return (htonl(IN_CLASSC_NET)); 609 } 610 #endif 611 612 u_int 613 res_randomid(void) { 614 struct timeval now; 615 616 gettimeofday(&now, NULL); 617 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 618 } 619 620 /* 621 * This routine is for closing the socket if a virtual circuit is used and 622 * the program wants to close it. This provides support for endhostent() 623 * which expects to close the socket. 624 * 625 * This routine is not expected to be user visible. 626 */ 627 void 628 res_nclose(res_state statp) { 629 int ns; 630 631 if (statp->_vcsock >= 0) { 632 (void) close(statp->_vcsock); 633 statp->_vcsock = -1; 634 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 635 } 636 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 637 if (statp->_u._ext.nssocks[ns] != -1) { 638 (void) close(statp->_u._ext.nssocks[ns]); 639 statp->_u._ext.nssocks[ns] = -1; 640 } 641 } 642 } 643 644 void 645 res_ndestroy(res_state statp) { 646 res_nclose(statp); 647 if (statp->_u._ext.ext != NULL) 648 free(statp->_u._ext.ext); 649 statp->options &= ~RES_INIT; 650 statp->_u._ext.ext = NULL; 651 } 652 653 const char * 654 res_get_nibblesuffix(res_state statp) { 655 if (statp->_u._ext.ext) 656 return (statp->_u._ext.ext->nsuffix); 657 return ("ip6.arpa"); 658 } 659 660 const char * 661 res_get_nibblesuffix2(res_state statp) { 662 if (statp->_u._ext.ext) 663 return (statp->_u._ext.ext->nsuffix2); 664 return ("ip6.int"); 665 } 666 667 void 668 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 669 int i, nserv; 670 size_t size; 671 672 /* close open servers */ 673 res_nclose(statp); 674 675 /* cause rtt times to be forgotten */ 676 statp->_u._ext.nscount = 0; 677 678 nserv = 0; 679 for (i = 0; i < cnt && nserv < MAXNS; i++) { 680 switch (set->sin.sin_family) { 681 case AF_INET: 682 size = sizeof(set->sin); 683 if (statp->_u._ext.ext) 684 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 685 &set->sin, size); 686 if (size <= sizeof(statp->nsaddr_list[nserv])) 687 memcpy(&statp->nsaddr_list[nserv], 688 &set->sin, size); 689 else 690 statp->nsaddr_list[nserv].sin_family = 0; 691 nserv++; 692 break; 693 694 #ifdef HAS_INET6_STRUCTS 695 case AF_INET6: 696 size = sizeof(set->sin6); 697 if (statp->_u._ext.ext) 698 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 699 &set->sin6, size); 700 if (size <= sizeof(statp->nsaddr_list[nserv])) 701 memcpy(&statp->nsaddr_list[nserv], 702 &set->sin6, size); 703 else 704 statp->nsaddr_list[nserv].sin_family = 0; 705 nserv++; 706 break; 707 #endif 708 709 default: 710 break; 711 } 712 set++; 713 } 714 statp->nscount = nserv; 715 716 } 717 718 int 719 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 720 int i; 721 size_t size; 722 u_int16_t family; 723 724 for (i = 0; i < statp->nscount && i < cnt; i++) { 725 if (statp->_u._ext.ext) 726 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 727 else 728 family = statp->nsaddr_list[i].sin_family; 729 730 switch (family) { 731 case AF_INET: 732 size = sizeof(set->sin); 733 if (statp->_u._ext.ext) 734 memcpy(&set->sin, 735 &statp->_u._ext.ext->nsaddrs[i], 736 size); 737 else 738 memcpy(&set->sin, &statp->nsaddr_list[i], 739 size); 740 break; 741 742 #ifdef HAS_INET6_STRUCTS 743 case AF_INET6: 744 size = sizeof(set->sin6); 745 if (statp->_u._ext.ext) 746 memcpy(&set->sin6, 747 &statp->_u._ext.ext->nsaddrs[i], 748 size); 749 else 750 memcpy(&set->sin6, &statp->nsaddr_list[i], 751 size); 752 break; 753 #endif 754 755 default: 756 set->sin.sin_family = 0; 757 break; 758 } 759 set++; 760 } 761 return (statp->nscount); 762 } 763
Indexes created Mon Sep 22 13:09:51 GMT 2025