res_init.c revision 1.2
1 /* $NetBSD: res_init.c,v 1.2 2004/05/20 17:41:00 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 1.9.2.5.4.2 2004/03/16 12:34:18 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 #include "port_after.h" 97 98 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 99 #include <resolv.h> 100 101 #include "res_private.h" 102 103 /* Options. Should all be left alone. */ 104 #define RESOLVSORT 105 #define DEBUG 106 107 static void res_setoptions __P((res_state, const char *, const char *)); 108 109 #ifdef RESOLVSORT 110 static const char sort_mask[] = "/&"; 111 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 112 static u_int32_t net_mask __P((struct in_addr)); 113 #endif 114 115 #if !defined(isascii) /* XXX - could be a function */ 116 # define isascii(c) (!(c & 0200)) 117 #endif 118 119 /* 120 * Resolver state default settings. 121 */ 122 123 /* 124 * Set up default settings. If the configuration file exist, the values 125 * there will have precedence. Otherwise, the server address is set to 126 * INADDR_ANY and the default domain name comes from the gethostname(). 127 * 128 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 129 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 130 * since it was noted that INADDR_ANY actually meant ``the first interface 131 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 132 * it had to be "up" in order for you to reach your own name server. It 133 * was later decided that since the recommended practice is to always 134 * install local static routes through 127.0.0.1 for all your network 135 * interfaces, that we could solve this problem without a code change. 136 * 137 * The configuration file should always be used, since it is the only way 138 * to specify a default domain. If you are running a server on your local 139 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 140 * in the configuration file. 141 * 142 * Return 0 if completes successfully, -1 on error 143 */ 144 int 145 res_ninit(res_state statp) { 146 extern int __res_vinit(res_state, int); 147 148 return (__res_vinit(statp, 0)); 149 } 150 151 /* This function has to be reachable by res_data.c but not publically. */ 152 int 153 __res_vinit(res_state statp, int preinit) { 154 register FILE *fp; 155 register char *cp, **pp; 156 register int n; 157 char buf[BUFSIZ]; 158 int nserv = 0; /* number of nameserver records read from file */ 159 int haveenv = 0; 160 int havesearch = 0; 161 #ifdef RESOLVSORT 162 int nsort = 0; 163 char *net; 164 #endif 165 int dots; 166 union res_sockaddr_union u[2]; 167 168 if (!preinit) { 169 statp->retrans = RES_TIMEOUT; 170 statp->retry = RES_DFLRETRY; 171 statp->options = RES_DEFAULT; 172 statp->id = res_randomid(); 173 } 174 175 if ((statp->options & RES_INIT) != 0U) 176 res_ndestroy(statp); 177 178 memset(u, 0, sizeof(u)); 179 #ifdef USELOOPBACK 180 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 181 #else 182 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 183 #endif 184 u[nserv].sin.sin_family = AF_INET; 185 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 186 #ifdef HAVE_SA_LEN 187 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 188 #endif 189 nserv++; 190 #ifdef HAS_INET6_STRUCTS 191 #ifdef USELOOPBACK 192 u[nserv].sin6.sin6_addr = in6addr_loopback; 193 #else 194 u[nserv].sin6.sin6_addr = in6addr_any; 195 #endif 196 u[nserv].sin6.sin6_family = AF_INET6; 197 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 198 #ifdef HAVE_SA_LEN 199 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 200 #endif 201 nserv++; 202 #endif 203 statp->nscount = 0; 204 statp->ndots = 1; 205 statp->pfcode = 0; 206 statp->_vcsock = -1; 207 statp->_flags = 0; 208 statp->qhook = NULL; 209 statp->rhook = NULL; 210 statp->_u._ext.nscount = 0; 211 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 212 if (statp->_u._ext.ext != NULL) { 213 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 214 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 215 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 216 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 217 } 218 #ifdef RESOLVSORT 219 statp->nsort = 0; 220 #endif 221 res_setservers(statp, u, nserv); 222 223 /* Allow user to override the local domain definition */ 224 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 225 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 226 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 227 haveenv++; 228 229 /* 230 * Set search list to be blank-separated strings 231 * from rest of env value. Permits users of LOCALDOMAIN 232 * to still have a search list, and anyone to set the 233 * one that they want to use as an individual (even more 234 * important now that the rfc1535 stuff restricts searches) 235 */ 236 cp = statp->defdname; 237 pp = statp->dnsrch; 238 *pp++ = cp; 239 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 240 if (*cp == '\n') /* silly backwards compat */ 241 break; 242 else if (*cp == ' ' || *cp == '\t') { 243 *cp = 0; 244 n = 1; 245 } else if (n) { 246 *pp++ = cp; 247 n = 0; 248 havesearch = 1; 249 } 250 } 251 /* null terminate last domain if there are excess */ 252 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 253 cp++; 254 *cp = '\0'; 255 *pp++ = 0; 256 } 257 258 #define MATCH(line, name) \ 259 (!strncmp(line, name, sizeof(name) - 1) && \ 260 (line[sizeof(name) - 1] == ' ' || \ 261 line[sizeof(name) - 1] == '\t')) 262 263 nserv = 0; 264 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 265 /* read the config file */ 266 while (fgets(buf, sizeof(buf), fp) != NULL) { 267 /* skip comments */ 268 if (*buf == ';' || *buf == '#') 269 continue; 270 /* read default domain name */ 271 if (MATCH(buf, "domain")) { 272 if (haveenv) /* skip if have from environ */ 273 continue; 274 cp = buf + sizeof("domain") - 1; 275 while (*cp == ' ' || *cp == '\t') 276 cp++; 277 if ((*cp == '\0') || (*cp == '\n')) 278 continue; 279 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 280 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 281 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 282 *cp = '\0'; 283 havesearch = 0; 284 continue; 285 } 286 /* set search list */ 287 if (MATCH(buf, "search")) { 288 if (haveenv) /* skip if have from environ */ 289 continue; 290 cp = buf + sizeof("search") - 1; 291 while (*cp == ' ' || *cp == '\t') 292 cp++; 293 if ((*cp == '\0') || (*cp == '\n')) 294 continue; 295 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 296 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 297 if ((cp = strchr(statp->defdname, '\n')) != NULL) 298 *cp = '\0'; 299 /* 300 * Set search list to be blank-separated strings 301 * on rest of line. 302 */ 303 cp = statp->defdname; 304 pp = statp->dnsrch; 305 *pp++ = cp; 306 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 307 if (*cp == ' ' || *cp == '\t') { 308 *cp = 0; 309 n = 1; 310 } else if (n) { 311 *pp++ = cp; 312 n = 0; 313 } 314 } 315 /* null terminate last domain if there are excess */ 316 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 317 cp++; 318 *cp = '\0'; 319 *pp++ = 0; 320 havesearch = 1; 321 continue; 322 } 323 /* read nameservers to query */ 324 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 325 struct addrinfo hints, *ai; 326 char sbuf[NI_MAXSERV]; 327 const size_t minsiz = 328 sizeof(statp->_u._ext.ext->nsaddrs[0]); 329 330 cp = buf + sizeof("nameserver") - 1; 331 while (*cp == ' ' || *cp == '\t') 332 cp++; 333 cp[strcspn(cp, ";# \t\n")] = '\0'; 334 if ((*cp != '\0') && (*cp != '\n')) { 335 memset(&hints, 0, sizeof(hints)); 336 hints.ai_family = PF_UNSPEC; 337 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 338 hints.ai_flags = AI_NUMERICHOST; 339 sprintf(sbuf, "%u", NAMESERVER_PORT); 340 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 341 ai->ai_addrlen <= minsiz) { 342 if (statp->_u._ext.ext != NULL) { 343 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 344 ai->ai_addr, ai->ai_addrlen); 345 } 346 if (ai->ai_addrlen <= 347 sizeof(statp->nsaddr_list[nserv])) { 348 memcpy(&statp->nsaddr_list[nserv], 349 ai->ai_addr, ai->ai_addrlen); 350 } else 351 statp->nsaddr_list[nserv].sin_family = 0; 352 freeaddrinfo(ai); 353 nserv++; 354 } 355 } 356 continue; 357 } 358 #ifdef RESOLVSORT 359 if (MATCH(buf, "sortlist")) { 360 struct in_addr a; 361 362 cp = buf + sizeof("sortlist") - 1; 363 while (nsort < MAXRESOLVSORT) { 364 while (*cp == ' ' || *cp == '\t') 365 cp++; 366 if (*cp == '\0' || *cp == '\n' || *cp == ';') 367 break; 368 net = cp; 369 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 370 isascii(*cp) && !isspace((unsigned char)*cp)) 371 cp++; 372 n = *cp; 373 *cp = 0; 374 if (inet_aton(net, &a)) { 375 statp->sort_list[nsort].addr = a; 376 if (ISSORTMASK(n)) { 377 *cp++ = n; 378 net = cp; 379 while (*cp && *cp != ';' && 380 isascii(*cp) && 381 !isspace((unsigned char)*cp)) 382 cp++; 383 n = *cp; 384 *cp = 0; 385 if (inet_aton(net, &a)) { 386 statp->sort_list[nsort].mask = a.s_addr; 387 } else { 388 statp->sort_list[nsort].mask = 389 net_mask(statp->sort_list[nsort].addr); 390 } 391 } else { 392 statp->sort_list[nsort].mask = 393 net_mask(statp->sort_list[nsort].addr); 394 } 395 nsort++; 396 } 397 *cp = n; 398 } 399 continue; 400 } 401 #endif 402 if (MATCH(buf, "options")) { 403 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 404 continue; 405 } 406 } 407 if (nserv > 0) 408 statp->nscount = nserv; 409 #ifdef RESOLVSORT 410 statp->nsort = nsort; 411 #endif 412 (void) fclose(fp); 413 } 414 /* 415 * Last chance to get a nameserver. This should not normally 416 * be necessary 417 */ 418 #ifdef NO_RESOLV_CONF 419 if(nserv == 0) 420 nserv = get_nameservers(statp); 421 #endif 422 423 if (statp->defdname[0] == 0 && 424 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 425 (cp = strchr(buf, '.')) != NULL) 426 strcpy(statp->defdname, cp + 1); 427 428 /* find components of local domain that might be searched */ 429 if (havesearch == 0) { 430 pp = statp->dnsrch; 431 *pp++ = statp->defdname; 432 *pp = NULL; 433 434 dots = 0; 435 for (cp = statp->defdname; *cp; cp++) 436 dots += (*cp == '.'); 437 438 cp = statp->defdname; 439 while (pp < statp->dnsrch + MAXDFLSRCH) { 440 if (dots < LOCALDOMAINPARTS) 441 break; 442 cp = strchr(cp, '.') + 1; /* we know there is one */ 443 *pp++ = cp; 444 dots--; 445 } 446 *pp = NULL; 447 #ifdef DEBUG 448 if (statp->options & RES_DEBUG) { 449 printf(";; res_init()... default dnsrch list:\n"); 450 for (pp = statp->dnsrch; *pp; pp++) 451 printf(";;\t%s\n", *pp); 452 printf(";;\t..END..\n"); 453 } 454 #endif 455 } 456 457 if ((cp = getenv("RES_OPTIONS")) != NULL) 458 res_setoptions(statp, cp, "env"); 459 statp->options |= RES_INIT; 460 return (0); 461 } 462 463 static void 464 res_setoptions(res_state statp, const char *options, const char *source) 465 { 466 const char *cp = options; 467 int i; 468 struct __res_state_ext *ext = statp->_u._ext.ext; 469 470 #ifdef DEBUG 471 if (statp->options & RES_DEBUG) 472 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 473 options, source); 474 #endif 475 while (*cp) { 476 /* skip leading and inner runs of spaces */ 477 while (*cp == ' ' || *cp == '\t') 478 cp++; 479 /* search for and process individual options */ 480 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 481 i = atoi(cp + sizeof("ndots:") - 1); 482 if (i <= RES_MAXNDOTS) 483 statp->ndots = i; 484 else 485 statp->ndots = RES_MAXNDOTS; 486 #ifdef DEBUG 487 if (statp->options & RES_DEBUG) 488 printf(";;\tndots=%d\n", statp->ndots); 489 #endif 490 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 491 i = atoi(cp + sizeof("timeout:") - 1); 492 if (i <= RES_MAXRETRANS) 493 statp->retrans = i; 494 else 495 statp->retrans = RES_MAXRETRANS; 496 #ifdef DEBUG 497 if (statp->options & RES_DEBUG) 498 printf(";;\ttimeout=%d\n", statp->retrans); 499 #endif 500 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 501 i = atoi(cp + sizeof("attempts:") - 1); 502 if (i <= RES_MAXRETRY) 503 statp->retry = i; 504 else 505 statp->retry = RES_MAXRETRY; 506 #ifdef DEBUG 507 if (statp->options & RES_DEBUG) 508 printf(";;\tattempts=%d\n", statp->retry); 509 #endif 510 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 511 #ifdef DEBUG 512 if (!(statp->options & RES_DEBUG)) { 513 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 514 options, source); 515 statp->options |= RES_DEBUG; 516 } 517 printf(";;\tdebug\n"); 518 #endif 519 } else if (!strncmp(cp, "no_tld_query", 520 sizeof("no_tld_query") - 1) || 521 !strncmp(cp, "no-tld-query", 522 sizeof("no-tld-query") - 1)) { 523 statp->options |= RES_NOTLDQUERY; 524 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 525 statp->options |= RES_USE_INET6; 526 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 527 statp->options |= RES_ROTATE; 528 } else if (!strncmp(cp, "no-check-names", 529 sizeof("no-check-names") - 1)) { 530 statp->options |= RES_NOCHECKNAME; 531 } 532 #ifdef RES_USE_EDNS0 533 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 534 statp->options |= RES_USE_EDNS0; 535 } 536 #endif 537 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 538 statp->options |= RES_USE_DNAME; 539 } 540 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 541 if (ext == NULL) 542 goto skip; 543 cp += sizeof("nibble:") - 1; 544 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 545 strncpy(ext->nsuffix, cp, (size_t)i); 546 ext->nsuffix[i] = '\0'; 547 } 548 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 549 if (ext == NULL) 550 goto skip; 551 cp += sizeof("nibble2:") - 1; 552 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 553 strncpy(ext->nsuffix2, cp, (size_t)i); 554 ext->nsuffix2[i] = '\0'; 555 } 556 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 557 cp += sizeof("v6revmode:") - 1; 558 /* "nibble" and "bitstring" used to be valid */ 559 if (!strncmp(cp, "single", sizeof("single") - 1)) { 560 statp->options |= RES_NO_NIBBLE2; 561 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 562 statp->options &= 563 ~RES_NO_NIBBLE2; 564 } 565 } 566 else { 567 /* XXX - print a warning here? */ 568 } 569 skip: 570 /* skip to next run of spaces */ 571 while (*cp && *cp != ' ' && *cp != '\t') 572 cp++; 573 } 574 } 575 576 #ifdef RESOLVSORT 577 /* XXX - should really support CIDR which means explicit masks always. */ 578 static u_int32_t 579 net_mask(in) /* XXX - should really use system's version of this */ 580 struct in_addr in; 581 { 582 register u_int32_t i = ntohl(in.s_addr); 583 584 if (IN_CLASSA(i)) 585 return (htonl(IN_CLASSA_NET)); 586 else if (IN_CLASSB(i)) 587 return (htonl(IN_CLASSB_NET)); 588 return (htonl(IN_CLASSC_NET)); 589 } 590 #endif 591 592 u_int 593 res_randomid(void) { 594 struct timeval now; 595 596 gettimeofday(&now, NULL); 597 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 598 } 599 600 /* 601 * This routine is for closing the socket if a virtual circuit is used and 602 * the program wants to close it. This provides support for endhostent() 603 * which expects to close the socket. 604 * 605 * This routine is not expected to be user visible. 606 */ 607 void 608 res_nclose(res_state statp) { 609 int ns; 610 611 if (statp->_vcsock >= 0) { 612 (void) close(statp->_vcsock); 613 statp->_vcsock = -1; 614 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 615 } 616 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 617 if (statp->_u._ext.nssocks[ns] != -1) { 618 (void) close(statp->_u._ext.nssocks[ns]); 619 statp->_u._ext.nssocks[ns] = -1; 620 } 621 } 622 } 623 624 void 625 res_ndestroy(res_state statp) { 626 res_nclose(statp); 627 if (statp->_u._ext.ext != NULL) 628 free(statp->_u._ext.ext); 629 statp->options &= ~RES_INIT; 630 statp->_u._ext.ext = NULL; 631 } 632 633 const char * 634 res_get_nibblesuffix(res_state statp) { 635 if (statp->_u._ext.ext) 636 return (statp->_u._ext.ext->nsuffix); 637 return ("ip6.arpa"); 638 } 639 640 const char * 641 res_get_nibblesuffix2(res_state statp) { 642 if (statp->_u._ext.ext) 643 return (statp->_u._ext.ext->nsuffix2); 644 return ("ip6.int"); 645 } 646 647 void 648 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 649 int i, nserv; 650 size_t size; 651 652 /* close open servers */ 653 res_nclose(statp); 654 655 /* cause rtt times to be forgotten */ 656 statp->_u._ext.nscount = 0; 657 658 nserv = 0; 659 for (i = 0; i < cnt && nserv < MAXNS; i++) { 660 switch (set->sin.sin_family) { 661 case AF_INET: 662 size = sizeof(set->sin); 663 if (statp->_u._ext.ext) 664 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 665 &set->sin, size); 666 if (size <= sizeof(statp->nsaddr_list[nserv])) 667 memcpy(&statp->nsaddr_list[nserv], 668 &set->sin, size); 669 else 670 statp->nsaddr_list[nserv].sin_family = 0; 671 nserv++; 672 break; 673 674 #ifdef HAS_INET6_STRUCTS 675 case AF_INET6: 676 size = sizeof(set->sin6); 677 if (statp->_u._ext.ext) 678 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 679 &set->sin6, size); 680 if (size <= sizeof(statp->nsaddr_list[nserv])) 681 memcpy(&statp->nsaddr_list[nserv], 682 &set->sin6, size); 683 else 684 statp->nsaddr_list[nserv].sin_family = 0; 685 nserv++; 686 break; 687 #endif 688 689 default: 690 break; 691 } 692 set++; 693 } 694 statp->nscount = nserv; 695 696 } 697 698 int 699 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 700 int i; 701 size_t size; 702 u_int16_t family; 703 704 for (i = 0; i < statp->nscount && i < cnt; i++) { 705 if (statp->_u._ext.ext) 706 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 707 else 708 family = statp->nsaddr_list[i].sin_family; 709 710 switch (family) { 711 case AF_INET: 712 size = sizeof(set->sin); 713 if (statp->_u._ext.ext) 714 memcpy(&set->sin, 715 &statp->_u._ext.ext->nsaddrs[i], 716 size); 717 else 718 memcpy(&set->sin, &statp->nsaddr_list[i], 719 size); 720 break; 721 722 #ifdef HAS_INET6_STRUCTS 723 case AF_INET6: 724 size = sizeof(set->sin6); 725 if (statp->_u._ext.ext) 726 memcpy(&set->sin6, 727 &statp->_u._ext.ext->nsaddrs[i], 728 size); 729 else 730 memcpy(&set->sin6, &statp->nsaddr_list[i], 731 size); 732 break; 733 #endif 734 735 default: 736 set->sin.sin_family = 0; 737 break; 738 } 739 set++; 740 } 741 return (statp->nscount); 742 } 743
Indexes created Mon Sep 22 10:09:38 GMT 2025