res_init.c revision 1.1.1.3
1 /* $NetBSD: res_init.c,v 1.1.1.3 2007/03/30 20:16:22 ghen 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 1.16.18.5 2006/08/30 23:23:13 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 #ifdef SOLARIS2 108 #include <sys/systeminfo.h> 109 #endif 110 111 static void res_setoptions __P((res_state, const char *, const char *)); 112 113 #ifdef RESOLVSORT 114 static const char sort_mask[] = "/&"; 115 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 116 static u_int32_t net_mask __P((struct in_addr)); 117 #endif 118 119 #if !defined(isascii) /*%< XXX - could be a function */ 120 # define isascii(c) (!(c & 0200)) 121 #endif 122 123 /* 124 * Resolver state default settings. 125 */ 126 127 /*% 128 * Set up default settings. If the configuration file exist, the values 129 * there will have precedence. Otherwise, the server address is set to 130 * INADDR_ANY and the default domain name comes from the gethostname(). 131 * 132 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 133 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 134 * since it was noted that INADDR_ANY actually meant ``the first interface 135 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 136 * it had to be "up" in order for you to reach your own name server. It 137 * was later decided that since the recommended practice is to always 138 * install local static routes through 127.0.0.1 for all your network 139 * interfaces, that we could solve this problem without a code change. 140 * 141 * The configuration file should always be used, since it is the only way 142 * to specify a default domain. If you are running a server on your local 143 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 144 * in the configuration file. 145 * 146 * Return 0 if completes successfully, -1 on error 147 */ 148 int 149 res_ninit(res_state statp) { 150 extern int __res_vinit(res_state, int); 151 152 return (__res_vinit(statp, 0)); 153 } 154 155 /*% This function has to be reachable by res_data.c but not publically. */ 156 int 157 __res_vinit(res_state statp, int preinit) { 158 register FILE *fp; 159 register char *cp, **pp; 160 register int n; 161 char buf[BUFSIZ]; 162 int nserv = 0; /*%< number of nameserver records read from file */ 163 int haveenv = 0; 164 int havesearch = 0; 165 #ifdef RESOLVSORT 166 int nsort = 0; 167 char *net; 168 #endif 169 int dots; 170 union res_sockaddr_union u[2]; 171 172 if (statp->_u._ext.ext != NULL) 173 res_ndestroy(statp); 174 175 if (!preinit) { 176 statp->retrans = RES_TIMEOUT; 177 statp->retry = RES_DFLRETRY; 178 statp->options = RES_DEFAULT; 179 statp->id = res_randomid(); 180 } 181 182 memset(u, 0, sizeof(u)); 183 #ifdef USELOOPBACK 184 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 185 #else 186 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 187 #endif 188 u[nserv].sin.sin_family = AF_INET; 189 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 190 #ifdef HAVE_SA_LEN 191 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 192 #endif 193 nserv++; 194 #ifdef HAS_INET6_STRUCTS 195 #ifdef USELOOPBACK 196 u[nserv].sin6.sin6_addr = in6addr_loopback; 197 #else 198 u[nserv].sin6.sin6_addr = in6addr_any; 199 #endif 200 u[nserv].sin6.sin6_family = AF_INET6; 201 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 202 #ifdef HAVE_SA_LEN 203 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 204 #endif 205 nserv++; 206 #endif 207 statp->nscount = 0; 208 statp->ndots = 1; 209 statp->pfcode = 0; 210 statp->_vcsock = -1; 211 statp->_flags = 0; 212 statp->qhook = NULL; 213 statp->rhook = NULL; 214 statp->_u._ext.nscount = 0; 215 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 216 if (statp->_u._ext.ext != NULL) { 217 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 218 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 219 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 220 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 221 } else 222 return (-1); 223 #ifdef RESOLVSORT 224 statp->nsort = 0; 225 #endif 226 res_setservers(statp, u, nserv); 227 228 #ifdef SOLARIS2 229 /* 230 * The old libresolv derived the defaultdomain from NIS/NIS+. 231 * We want to keep this behaviour 232 */ 233 { 234 char buf[sizeof(statp->defdname)], *cp; 235 int ret; 236 237 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 238 (unsigned int)ret <= sizeof(buf)) { 239 if (buf[0] == '+') 240 buf[0] = '.'; 241 cp = strchr(buf, '.'); 242 cp = (cp == NULL) ? buf : (cp + 1); 243 if (strlen(cp) >= sizeof(statp->defdname)) 244 goto freedata; 245 strcpy(statp->defdname, cp); 246 } 247 } 248 #endif /* SOLARIS2 */ 249 250 /* Allow user to override the local domain definition */ 251 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 252 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 253 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 254 haveenv++; 255 256 /* 257 * Set search list to be blank-separated strings 258 * from rest of env value. Permits users of LOCALDOMAIN 259 * to still have a search list, and anyone to set the 260 * one that they want to use as an individual (even more 261 * important now that the rfc1535 stuff restricts searches) 262 */ 263 cp = statp->defdname; 264 pp = statp->dnsrch; 265 *pp++ = cp; 266 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 267 if (*cp == '\n') /*%< silly backwards compat */ 268 break; 269 else if (*cp == ' ' || *cp == '\t') { 270 *cp = 0; 271 n = 1; 272 } else if (n) { 273 *pp++ = cp; 274 n = 0; 275 havesearch = 1; 276 } 277 } 278 /* null terminate last domain if there are excess */ 279 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 280 cp++; 281 *cp = '\0'; 282 *pp++ = 0; 283 } 284 285 #define MATCH(line, name) \ 286 (!strncmp(line, name, sizeof(name) - 1) && \ 287 (line[sizeof(name) - 1] == ' ' || \ 288 line[sizeof(name) - 1] == '\t')) 289 290 nserv = 0; 291 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 292 /* read the config file */ 293 while (fgets(buf, sizeof(buf), fp) != NULL) { 294 /* skip comments */ 295 if (*buf == ';' || *buf == '#') 296 continue; 297 /* read default domain name */ 298 if (MATCH(buf, "domain")) { 299 if (haveenv) /*%< skip if have from environ */ 300 continue; 301 cp = buf + sizeof("domain") - 1; 302 while (*cp == ' ' || *cp == '\t') 303 cp++; 304 if ((*cp == '\0') || (*cp == '\n')) 305 continue; 306 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 307 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 308 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 309 *cp = '\0'; 310 havesearch = 0; 311 continue; 312 } 313 /* set search list */ 314 if (MATCH(buf, "search")) { 315 if (haveenv) /*%< skip if have from environ */ 316 continue; 317 cp = buf + sizeof("search") - 1; 318 while (*cp == ' ' || *cp == '\t') 319 cp++; 320 if ((*cp == '\0') || (*cp == '\n')) 321 continue; 322 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 323 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 324 if ((cp = strchr(statp->defdname, '\n')) != NULL) 325 *cp = '\0'; 326 /* 327 * Set search list to be blank-separated strings 328 * on rest of line. 329 */ 330 cp = statp->defdname; 331 pp = statp->dnsrch; 332 *pp++ = cp; 333 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 334 if (*cp == ' ' || *cp == '\t') { 335 *cp = 0; 336 n = 1; 337 } else if (n) { 338 *pp++ = cp; 339 n = 0; 340 } 341 } 342 /* null terminate last domain if there are excess */ 343 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 344 cp++; 345 *cp = '\0'; 346 *pp++ = 0; 347 havesearch = 1; 348 continue; 349 } 350 /* read nameservers to query */ 351 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 352 struct addrinfo hints, *ai; 353 char sbuf[NI_MAXSERV]; 354 const size_t minsiz = 355 sizeof(statp->_u._ext.ext->nsaddrs[0]); 356 357 cp = buf + sizeof("nameserver") - 1; 358 while (*cp == ' ' || *cp == '\t') 359 cp++; 360 cp[strcspn(cp, ";# \t\n")] = '\0'; 361 if ((*cp != '\0') && (*cp != '\n')) { 362 memset(&hints, 0, sizeof(hints)); 363 hints.ai_family = PF_UNSPEC; 364 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 365 hints.ai_flags = AI_NUMERICHOST; 366 sprintf(sbuf, "%u", NAMESERVER_PORT); 367 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 368 ai->ai_addrlen <= minsiz) { 369 if (statp->_u._ext.ext != NULL) { 370 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 371 ai->ai_addr, ai->ai_addrlen); 372 } 373 if (ai->ai_addrlen <= 374 sizeof(statp->nsaddr_list[nserv])) { 375 memcpy(&statp->nsaddr_list[nserv], 376 ai->ai_addr, ai->ai_addrlen); 377 } else 378 statp->nsaddr_list[nserv].sin_family = 0; 379 freeaddrinfo(ai); 380 nserv++; 381 } 382 } 383 continue; 384 } 385 #ifdef RESOLVSORT 386 if (MATCH(buf, "sortlist")) { 387 struct in_addr a; 388 389 cp = buf + sizeof("sortlist") - 1; 390 while (nsort < MAXRESOLVSORT) { 391 while (*cp == ' ' || *cp == '\t') 392 cp++; 393 if (*cp == '\0' || *cp == '\n' || *cp == ';') 394 break; 395 net = cp; 396 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 397 isascii(*cp) && !isspace((unsigned char)*cp)) 398 cp++; 399 n = *cp; 400 *cp = 0; 401 if (inet_aton(net, &a)) { 402 statp->sort_list[nsort].addr = a; 403 if (ISSORTMASK(n)) { 404 *cp++ = n; 405 net = cp; 406 while (*cp && *cp != ';' && 407 isascii(*cp) && 408 !isspace((unsigned char)*cp)) 409 cp++; 410 n = *cp; 411 *cp = 0; 412 if (inet_aton(net, &a)) { 413 statp->sort_list[nsort].mask = a.s_addr; 414 } else { 415 statp->sort_list[nsort].mask = 416 net_mask(statp->sort_list[nsort].addr); 417 } 418 } else { 419 statp->sort_list[nsort].mask = 420 net_mask(statp->sort_list[nsort].addr); 421 } 422 nsort++; 423 } 424 *cp = n; 425 } 426 continue; 427 } 428 #endif 429 if (MATCH(buf, "options")) { 430 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 431 continue; 432 } 433 } 434 if (nserv > 0) 435 statp->nscount = nserv; 436 #ifdef RESOLVSORT 437 statp->nsort = nsort; 438 #endif 439 (void) fclose(fp); 440 } 441 /* 442 * Last chance to get a nameserver. This should not normally 443 * be necessary 444 */ 445 #ifdef NO_RESOLV_CONF 446 if(nserv == 0) 447 nserv = get_nameservers(statp); 448 #endif 449 450 if (statp->defdname[0] == 0 && 451 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 452 (cp = strchr(buf, '.')) != NULL) 453 strcpy(statp->defdname, cp + 1); 454 455 /* find components of local domain that might be searched */ 456 if (havesearch == 0) { 457 pp = statp->dnsrch; 458 *pp++ = statp->defdname; 459 *pp = NULL; 460 461 dots = 0; 462 for (cp = statp->defdname; *cp; cp++) 463 dots += (*cp == '.'); 464 465 cp = statp->defdname; 466 while (pp < statp->dnsrch + MAXDFLSRCH) { 467 if (dots < LOCALDOMAINPARTS) 468 break; 469 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 470 *pp++ = cp; 471 dots--; 472 } 473 *pp = NULL; 474 #ifdef DEBUG 475 if (statp->options & RES_DEBUG) { 476 printf(";; res_init()... default dnsrch list:\n"); 477 for (pp = statp->dnsrch; *pp; pp++) 478 printf(";;\t%s\n", *pp); 479 printf(";;\t..END..\n"); 480 } 481 #endif 482 } 483 484 if ((cp = getenv("RES_OPTIONS")) != NULL) 485 res_setoptions(statp, cp, "env"); 486 statp->options |= RES_INIT; 487 return (0); 488 489 #ifdef SOLARIS2 490 freedata: 491 if (statp->_u._ext.ext != NULL) { 492 free(statp->_u._ext.ext); 493 statp->_u._ext.ext = NULL; 494 } 495 return (-1); 496 #endif 497 } 498 499 static void 500 res_setoptions(res_state statp, const char *options, const char *source) 501 { 502 const char *cp = options; 503 int i; 504 struct __res_state_ext *ext = statp->_u._ext.ext; 505 506 #ifdef DEBUG 507 if (statp->options & RES_DEBUG) 508 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 509 options, source); 510 #endif 511 while (*cp) { 512 /* skip leading and inner runs of spaces */ 513 while (*cp == ' ' || *cp == '\t') 514 cp++; 515 /* search for and process individual options */ 516 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 517 i = atoi(cp + sizeof("ndots:") - 1); 518 if (i <= RES_MAXNDOTS) 519 statp->ndots = i; 520 else 521 statp->ndots = RES_MAXNDOTS; 522 #ifdef DEBUG 523 if (statp->options & RES_DEBUG) 524 printf(";;\tndots=%d\n", statp->ndots); 525 #endif 526 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 527 i = atoi(cp + sizeof("timeout:") - 1); 528 if (i <= RES_MAXRETRANS) 529 statp->retrans = i; 530 else 531 statp->retrans = RES_MAXRETRANS; 532 #ifdef DEBUG 533 if (statp->options & RES_DEBUG) 534 printf(";;\ttimeout=%d\n", statp->retrans); 535 #endif 536 #ifdef SOLARIS2 537 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 538 /* 539 * For backward compatibility, 'retrans' is 540 * supported as an alias for 'timeout', though 541 * without an imposed maximum. 542 */ 543 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 544 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 545 /* 546 * For backward compatibility, 'retry' is 547 * supported as an alias for 'attempts', though 548 * without an imposed maximum. 549 */ 550 statp->retry = atoi(cp + sizeof("retry:") - 1); 551 #endif /* SOLARIS2 */ 552 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 553 i = atoi(cp + sizeof("attempts:") - 1); 554 if (i <= RES_MAXRETRY) 555 statp->retry = i; 556 else 557 statp->retry = RES_MAXRETRY; 558 #ifdef DEBUG 559 if (statp->options & RES_DEBUG) 560 printf(";;\tattempts=%d\n", statp->retry); 561 #endif 562 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 563 #ifdef DEBUG 564 if (!(statp->options & RES_DEBUG)) { 565 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 566 options, source); 567 statp->options |= RES_DEBUG; 568 } 569 printf(";;\tdebug\n"); 570 #endif 571 } else if (!strncmp(cp, "no_tld_query", 572 sizeof("no_tld_query") - 1) || 573 !strncmp(cp, "no-tld-query", 574 sizeof("no-tld-query") - 1)) { 575 statp->options |= RES_NOTLDQUERY; 576 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 577 statp->options |= RES_USE_INET6; 578 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 579 statp->options |= RES_ROTATE; 580 } else if (!strncmp(cp, "no-check-names", 581 sizeof("no-check-names") - 1)) { 582 statp->options |= RES_NOCHECKNAME; 583 } 584 #ifdef RES_USE_EDNS0 585 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 586 statp->options |= RES_USE_EDNS0; 587 } 588 #endif 589 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 590 statp->options |= RES_USE_DNAME; 591 } 592 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 593 if (ext == NULL) 594 goto skip; 595 cp += sizeof("nibble:") - 1; 596 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 597 strncpy(ext->nsuffix, cp, i); 598 ext->nsuffix[i] = '\0'; 599 } 600 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 601 if (ext == NULL) 602 goto skip; 603 cp += sizeof("nibble2:") - 1; 604 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 605 strncpy(ext->nsuffix2, cp, i); 606 ext->nsuffix2[i] = '\0'; 607 } 608 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 609 cp += sizeof("v6revmode:") - 1; 610 /* "nibble" and "bitstring" used to be valid */ 611 if (!strncmp(cp, "single", sizeof("single") - 1)) { 612 statp->options |= RES_NO_NIBBLE2; 613 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 614 statp->options &= 615 ~RES_NO_NIBBLE2; 616 } 617 } 618 else { 619 /* XXX - print a warning here? */ 620 } 621 skip: 622 /* skip to next run of spaces */ 623 while (*cp && *cp != ' ' && *cp != '\t') 624 cp++; 625 } 626 } 627 628 #ifdef RESOLVSORT 629 /* XXX - should really support CIDR which means explicit masks always. */ 630 static u_int32_t 631 net_mask(in) /*!< XXX - should really use system's version of this */ 632 struct in_addr in; 633 { 634 register u_int32_t i = ntohl(in.s_addr); 635 636 if (IN_CLASSA(i)) 637 return (htonl(IN_CLASSA_NET)); 638 else if (IN_CLASSB(i)) 639 return (htonl(IN_CLASSB_NET)); 640 return (htonl(IN_CLASSC_NET)); 641 } 642 #endif 643 644 u_int 645 res_randomid(void) { 646 struct timeval now; 647 648 gettimeofday(&now, NULL); 649 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 650 } 651 652 /*% 653 * This routine is for closing the socket if a virtual circuit is used and 654 * the program wants to close it. This provides support for endhostent() 655 * which expects to close the socket. 656 * 657 * This routine is not expected to be user visible. 658 */ 659 void 660 res_nclose(res_state statp) { 661 int ns; 662 663 if (statp->_vcsock >= 0) { 664 (void) close(statp->_vcsock); 665 statp->_vcsock = -1; 666 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 667 } 668 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 669 if (statp->_u._ext.nssocks[ns] != -1) { 670 (void) close(statp->_u._ext.nssocks[ns]); 671 statp->_u._ext.nssocks[ns] = -1; 672 } 673 } 674 } 675 676 void 677 res_ndestroy(res_state statp) { 678 res_nclose(statp); 679 if (statp->_u._ext.ext != NULL) 680 free(statp->_u._ext.ext); 681 statp->options &= ~RES_INIT; 682 statp->_u._ext.ext = NULL; 683 } 684 685 const char * 686 res_get_nibblesuffix(res_state statp) { 687 if (statp->_u._ext.ext) 688 return (statp->_u._ext.ext->nsuffix); 689 return ("ip6.arpa"); 690 } 691 692 const char * 693 res_get_nibblesuffix2(res_state statp) { 694 if (statp->_u._ext.ext) 695 return (statp->_u._ext.ext->nsuffix2); 696 return ("ip6.int"); 697 } 698 699 void 700 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 701 int i, nserv; 702 size_t size; 703 704 /* close open servers */ 705 res_nclose(statp); 706 707 /* cause rtt times to be forgotten */ 708 statp->_u._ext.nscount = 0; 709 710 nserv = 0; 711 for (i = 0; i < cnt && nserv < MAXNS; i++) { 712 switch (set->sin.sin_family) { 713 case AF_INET: 714 size = sizeof(set->sin); 715 if (statp->_u._ext.ext) 716 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 717 &set->sin, size); 718 if (size <= sizeof(statp->nsaddr_list[nserv])) 719 memcpy(&statp->nsaddr_list[nserv], 720 &set->sin, size); 721 else 722 statp->nsaddr_list[nserv].sin_family = 0; 723 nserv++; 724 break; 725 726 #ifdef HAS_INET6_STRUCTS 727 case AF_INET6: 728 size = sizeof(set->sin6); 729 if (statp->_u._ext.ext) 730 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 731 &set->sin6, size); 732 if (size <= sizeof(statp->nsaddr_list[nserv])) 733 memcpy(&statp->nsaddr_list[nserv], 734 &set->sin6, size); 735 else 736 statp->nsaddr_list[nserv].sin_family = 0; 737 nserv++; 738 break; 739 #endif 740 741 default: 742 break; 743 } 744 set++; 745 } 746 statp->nscount = nserv; 747 748 } 749 750 int 751 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 752 int i; 753 size_t size; 754 u_int16_t family; 755 756 for (i = 0; i < statp->nscount && i < cnt; i++) { 757 if (statp->_u._ext.ext) 758 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 759 else 760 family = statp->nsaddr_list[i].sin_family; 761 762 switch (family) { 763 case AF_INET: 764 size = sizeof(set->sin); 765 if (statp->_u._ext.ext) 766 memcpy(&set->sin, 767 &statp->_u._ext.ext->nsaddrs[i], 768 size); 769 else 770 memcpy(&set->sin, &statp->nsaddr_list[i], 771 size); 772 break; 773 774 #ifdef HAS_INET6_STRUCTS 775 case AF_INET6: 776 size = sizeof(set->sin6); 777 if (statp->_u._ext.ext) 778 memcpy(&set->sin6, 779 &statp->_u._ext.ext->nsaddrs[i], 780 size); 781 else 782 memcpy(&set->sin6, &statp->nsaddr_list[i], 783 size); 784 break; 785 #endif 786 787 default: 788 set->sin.sin_family = 0; 789 break; 790 } 791 set++; 792 } 793 return (statp->nscount); 794 } 795 796 /*! \file */ 797
Indexes created Tue Sep 23 23:09:58 GMT 2025