1 /* 2 * Copyright (c) 1985, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 */ 53 54 /* 55 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 57 * 58 * Permission to use, copy, modify, and distribute this software for any 59 * purpose with or without fee is hereby granted, provided that the above 60 * copyright notice and this permission notice appear in all copies. 61 * 62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 64 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 69 */ 70 71 #if defined(LIBC_SCCS) && !defined(lint) 72 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 73 static const char rcsid[] = "$Id: res_init.c,v 1.9.2.5.4.6 2006/08/30 23:23:01 marka Exp $"; 74 #endif /* LIBC_SCCS and not lint */ 75 76 #include "port_before.h" 77 78 #include <sys/types.h> 79 #include <sys/param.h> 80 #include <sys/socket.h> 81 #include <sys/time.h> 82 83 #include <netinet/in.h> 84 #include <arpa/inet.h> 85 #include <arpa/nameser.h> 86 87 #include <ctype.h> 88 #include <stdio.h> 89 #include <stdlib.h> 90 #include <string.h> 91 #include <unistd.h> 92 #include <netdb.h> 93 94 #include "port_after.h" 95 96 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 97 #include <resolv.h> 98 99 #include "res_private.h" 100 101 /* Options. Should all be left alone. */ 102 #define RESOLVSORT 103 #define DEBUG 104 105 #ifdef SOLARIS2 106 #include <sys/systeminfo.h> 107 #endif 108 109 static void res_setoptions __P((res_state, const char *, const char *)); 110 111 #ifdef RESOLVSORT 112 static const char sort_mask[] = "/&"; 113 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 114 static u_int32_t net_mask __P((struct in_addr)); 115 #endif 116 117 #if !defined(isascii) /* XXX - could be a function */ 118 # define isascii(c) (!(c & 0200)) 119 #endif 120 121 /* 122 * Resolver state default settings. 123 */ 124 125 /* 126 * Set up default settings. If the configuration file exist, the values 127 * there will have precedence. Otherwise, the server address is set to 128 * INADDR_ANY and the default domain name comes from the gethostname(). 129 * 130 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 131 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 132 * since it was noted that INADDR_ANY actually meant ``the first interface 133 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 134 * it had to be "up" in order for you to reach your own name server. It 135 * was later decided that since the recommended practice is to always 136 * install local static routes through 127.0.0.1 for all your network 137 * interfaces, that we could solve this problem without a code change. 138 * 139 * The configuration file should always be used, since it is the only way 140 * to specify a default domain. If you are running a server on your local 141 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 142 * in the configuration file. 143 * 144 * Return 0 if completes successfully, -1 on error 145 */ 146 int 147 res_ninit(res_state statp) { 148 extern int __res_vinit(res_state, int); 149 150 return (__res_vinit(statp, 0)); 151 } 152 153 /* This function has to be reachable by res_data.c but not publically. */ 154 int 155 __res_vinit(res_state statp, int preinit) { 156 register FILE *fp; 157 register char *cp, **pp; 158 register int n; 159 char buf[BUFSIZ]; 160 int nserv = 0; /* number of nameserver records read from file */ 161 int haveenv = 0; 162 int havesearch = 0; 163 #ifdef RESOLVSORT 164 int nsort = 0; 165 char *net; 166 #endif 167 int dots; 168 union res_sockaddr_union u[2]; 169 170 if (statp->_u._ext.ext != NULL) 171 res_ndestroy(statp); 172 173 if (!preinit) { 174 statp->retrans = RES_TIMEOUT; 175 statp->retry = RES_DFLRETRY; 176 statp->options = RES_DEFAULT; 177 statp->id = res_randomid(); 178 } 179 180 memset(u, 0, sizeof(u)); 181 #ifdef USELOOPBACK 182 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 183 #else 184 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 185 #endif 186 u[nserv].sin.sin_family = AF_INET; 187 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 188 #ifdef HAVE_SA_LEN 189 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 190 #endif 191 nserv++; 192 #ifdef HAS_INET6_STRUCTS 193 #ifdef USELOOPBACK 194 u[nserv].sin6.sin6_addr = in6addr_loopback; 195 #else 196 u[nserv].sin6.sin6_addr = in6addr_any; 197 #endif 198 u[nserv].sin6.sin6_family = AF_INET6; 199 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 200 #ifdef HAVE_SA_LEN 201 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 202 #endif 203 nserv++; 204 #endif 205 statp->nscount = 0; 206 statp->ndots = 1; 207 statp->pfcode = 0; 208 statp->_vcsock = -1; 209 statp->_flags = 0; 210 statp->qhook = NULL; 211 statp->rhook = NULL; 212 statp->_u._ext.nscount = 0; 213 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 214 if (statp->_u._ext.ext != NULL) { 215 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 216 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 217 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 218 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 219 } else 220 return (-1); 221 #ifdef RESOLVSORT 222 statp->nsort = 0; 223 #endif 224 res_setservers(statp, u, nserv); 225 226 #ifdef SOLARIS2 227 /* 228 * The old libresolv derived the defaultdomain from NIS/NIS+. 229 * We want to keep this behaviour 230 */ 231 { 232 char buf[sizeof(statp->defdname)], *cp; 233 int ret; 234 235 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 236 (unsigned int)ret <= sizeof(buf)) { 237 if (buf[0] == '+') 238 buf[0] = '.'; 239 cp = strchr(buf, '.'); 240 cp = (cp == NULL) ? buf : (cp + 1); 241 if (strlen(cp) >= sizeof(statp->defdname)) 242 goto freedata; 243 strcpy(statp->defdname, cp); 244 } 245 } 246 #endif /* SOLARIS2 */ 247 248 /* Allow user to override the local domain definition */ 249 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 250 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 251 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 252 haveenv++; 253 254 /* 255 * Set search list to be blank-separated strings 256 * from rest of env value. Permits users of LOCALDOMAIN 257 * to still have a search list, and anyone to set the 258 * one that they want to use as an individual (even more 259 * important now that the rfc1535 stuff restricts searches) 260 */ 261 cp = statp->defdname; 262 pp = statp->dnsrch; 263 *pp++ = cp; 264 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 265 if (*cp == '\n') /* silly backwards compat */ 266 break; 267 else if (*cp == ' ' || *cp == '\t') { 268 *cp = 0; 269 n = 1; 270 } else if (n) { 271 *pp++ = cp; 272 n = 0; 273 havesearch = 1; 274 } 275 } 276 /* null terminate last domain if there are excess */ 277 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 278 cp++; 279 *cp = '\0'; 280 *pp++ = 0; 281 } 282 283 #define MATCH(line, name) \ 284 (!strncmp(line, name, sizeof(name) - 1) && \ 285 (line[sizeof(name) - 1] == ' ' || \ 286 line[sizeof(name) - 1] == '\t')) 287 288 nserv = 0; 289 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 290 /* read the config file */ 291 while (fgets(buf, sizeof(buf), fp) != NULL) { 292 /* skip comments */ 293 if (*buf == ';' || *buf == '#') 294 continue; 295 /* read default domain name */ 296 if (MATCH(buf, "domain")) { 297 if (haveenv) /* skip if have from environ */ 298 continue; 299 cp = buf + sizeof("domain") - 1; 300 while (*cp == ' ' || *cp == '\t') 301 cp++; 302 if ((*cp == '\0') || (*cp == '\n')) 303 continue; 304 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 305 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 306 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 307 *cp = '\0'; 308 havesearch = 0; 309 continue; 310 } 311 /* set search list */ 312 if (MATCH(buf, "search")) { 313 if (haveenv) /* skip if have from environ */ 314 continue; 315 cp = buf + sizeof("search") - 1; 316 while (*cp == ' ' || *cp == '\t') 317 cp++; 318 if ((*cp == '\0') || (*cp == '\n')) 319 continue; 320 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 321 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 322 if ((cp = strchr(statp->defdname, '\n')) != NULL) 323 *cp = '\0'; 324 /* 325 * Set search list to be blank-separated strings 326 * on rest of line. 327 */ 328 cp = statp->defdname; 329 pp = statp->dnsrch; 330 *pp++ = cp; 331 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 332 if (*cp == ' ' || *cp == '\t') { 333 *cp = 0; 334 n = 1; 335 } else if (n) { 336 *pp++ = cp; 337 n = 0; 338 } 339 } 340 /* null terminate last domain if there are excess */ 341 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 342 cp++; 343 *cp = '\0'; 344 *pp++ = 0; 345 havesearch = 1; 346 continue; 347 } 348 /* read nameservers to query */ 349 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 350 struct addrinfo hints, *ai; 351 char sbuf[NI_MAXSERV]; 352 const size_t minsiz = 353 sizeof(statp->_u._ext.ext->nsaddrs[0]); 354 355 cp = buf + sizeof("nameserver") - 1; 356 while (*cp == ' ' || *cp == '\t') 357 cp++; 358 cp[strcspn(cp, ";# \t\n")] = '\0'; 359 if ((*cp != '\0') && (*cp != '\n')) { 360 memset(&hints, 0, sizeof(hints)); 361 hints.ai_family = PF_UNSPEC; 362 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 363 hints.ai_flags = AI_NUMERICHOST; 364 sprintf(sbuf, "%u", NAMESERVER_PORT); 365 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 366 ai->ai_addrlen <= minsiz) { 367 if (statp->_u._ext.ext != NULL) { 368 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 369 ai->ai_addr, ai->ai_addrlen); 370 } 371 if (ai->ai_addrlen <= 372 sizeof(statp->nsaddr_list[nserv])) { 373 memcpy(&statp->nsaddr_list[nserv], 374 ai->ai_addr, ai->ai_addrlen); 375 } else 376 statp->nsaddr_list[nserv].sin_family = 0; 377 freeaddrinfo(ai); 378 nserv++; 379 } 380 } 381 continue; 382 } 383 #ifdef RESOLVSORT 384 if (MATCH(buf, "sortlist")) { 385 struct in_addr a; 386 387 cp = buf + sizeof("sortlist") - 1; 388 while (nsort < MAXRESOLVSORT) { 389 while (*cp == ' ' || *cp == '\t') 390 cp++; 391 if (*cp == '\0' || *cp == '\n' || *cp == ';') 392 break; 393 net = cp; 394 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 395 isascii(*cp) && !isspace((unsigned char)*cp)) 396 cp++; 397 n = *cp; 398 *cp = 0; 399 if (inet_aton(net, &a)) { 400 statp->sort_list[nsort].addr = a; 401 if (ISSORTMASK(n)) { 402 *cp++ = n; 403 net = cp; 404 while (*cp && *cp != ';' && 405 isascii(*cp) && 406 !isspace((unsigned char)*cp)) 407 cp++; 408 n = *cp; 409 *cp = 0; 410 if (inet_aton(net, &a)) { 411 statp->sort_list[nsort].mask = a.s_addr; 412 } else { 413 statp->sort_list[nsort].mask = 414 net_mask(statp->sort_list[nsort].addr); 415 } 416 } else { 417 statp->sort_list[nsort].mask = 418 net_mask(statp->sort_list[nsort].addr); 419 } 420 nsort++; 421 } 422 *cp = n; 423 } 424 continue; 425 } 426 #endif 427 if (MATCH(buf, "options")) { 428 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 429 continue; 430 } 431 } 432 if (nserv > 0) 433 statp->nscount = nserv; 434 #ifdef RESOLVSORT 435 statp->nsort = nsort; 436 #endif 437 (void) fclose(fp); 438 } 439 /* 440 * Last chance to get a nameserver. This should not normally 441 * be necessary 442 */ 443 #ifdef NO_RESOLV_CONF 444 if(nserv == 0) 445 nserv = get_nameservers(statp); 446 #endif 447 448 if (statp->defdname[0] == 0 && 449 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 450 (cp = strchr(buf, '.')) != NULL) 451 strcpy(statp->defdname, cp + 1); 452 453 /* find components of local domain that might be searched */ 454 if (havesearch == 0) { 455 pp = statp->dnsrch; 456 *pp++ = statp->defdname; 457 *pp = NULL; 458 459 dots = 0; 460 for (cp = statp->defdname; *cp; cp++) 461 dots += (*cp == '.'); 462 463 cp = statp->defdname; 464 while (pp < statp->dnsrch + MAXDFLSRCH) { 465 if (dots < LOCALDOMAINPARTS) 466 break; 467 cp = strchr(cp, '.') + 1; /* we know there is one */ 468 *pp++ = cp; 469 dots--; 470 } 471 *pp = NULL; 472 #ifdef DEBUG 473 if (statp->options & RES_DEBUG) { 474 printf(";; res_init()... default dnsrch list:\n"); 475 for (pp = statp->dnsrch; *pp; pp++) 476 printf(";;\t%s\n", *pp); 477 printf(";;\t..END..\n"); 478 } 479 #endif 480 } 481 482 if ((cp = getenv("RES_OPTIONS")) != NULL) 483 res_setoptions(statp, cp, "env"); 484 statp->options |= RES_INIT; 485 return (0); 486 487 #ifdef SOLARIS2 488 freedata: 489 if (statp->_u._ext.ext != NULL) { 490 free(statp->_u._ext.ext); 491 statp->_u._ext.ext = NULL; 492 } 493 return (-1); 494 #endif 495 } 496 497 static void 498 res_setoptions(res_state statp, const char *options, const char *source) 499 { 500 const char *cp = options; 501 int i; 502 struct __res_state_ext *ext = statp->_u._ext.ext; 503 504 #ifdef DEBUG 505 if (statp->options & RES_DEBUG) 506 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 507 options, source); 508 #endif 509 while (*cp) { 510 /* skip leading and inner runs of spaces */ 511 while (*cp == ' ' || *cp == '\t') 512 cp++; 513 /* search for and process individual options */ 514 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 515 i = atoi(cp + sizeof("ndots:") - 1); 516 if (i <= RES_MAXNDOTS) 517 statp->ndots = i; 518 else 519 statp->ndots = RES_MAXNDOTS; 520 #ifdef DEBUG 521 if (statp->options & RES_DEBUG) 522 printf(";;\tndots=%d\n", statp->ndots); 523 #endif 524 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 525 i = atoi(cp + sizeof("timeout:") - 1); 526 if (i <= RES_MAXRETRANS) 527 statp->retrans = i; 528 else 529 statp->retrans = RES_MAXRETRANS; 530 #ifdef DEBUG 531 if (statp->options & RES_DEBUG) 532 printf(";;\ttimeout=%d\n", statp->retrans); 533 #endif 534 #ifdef SOLARIS2 535 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 536 /* 537 * For backward compatibility, 'retrans' is 538 * supported as an alias for 'timeout', though 539 * without an imposed maximum. 540 */ 541 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 542 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 543 /* 544 * For backward compatibility, 'retry' is 545 * supported as an alias for 'attempts', though 546 * without an imposed maximum. 547 */ 548 statp->retry = atoi(cp + sizeof("retry:") - 1); 549 #endif /* SOLARIS2 */ 550 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 551 i = atoi(cp + sizeof("attempts:") - 1); 552 if (i <= RES_MAXRETRY) 553 statp->retry = i; 554 else 555 statp->retry = RES_MAXRETRY; 556 #ifdef DEBUG 557 if (statp->options & RES_DEBUG) 558 printf(";;\tattempts=%d\n", statp->retry); 559 #endif 560 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 561 #ifdef DEBUG 562 if (!(statp->options & RES_DEBUG)) { 563 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 564 options, source); 565 statp->options |= RES_DEBUG; 566 } 567 printf(";;\tdebug\n"); 568 #endif 569 } else if (!strncmp(cp, "no_tld_query", 570 sizeof("no_tld_query") - 1) || 571 !strncmp(cp, "no-tld-query", 572 sizeof("no-tld-query") - 1)) { 573 statp->options |= RES_NOTLDQUERY; 574 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 575 statp->options |= RES_USE_INET6; 576 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 577 statp->options |= RES_ROTATE; 578 } else if (!strncmp(cp, "no-check-names", 579 sizeof("no-check-names") - 1)) { 580 statp->options |= RES_NOCHECKNAME; 581 } 582 #ifdef RES_USE_EDNS0 583 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 584 statp->options |= RES_USE_EDNS0; 585 } 586 #endif 587 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 588 statp->options |= RES_USE_DNAME; 589 } 590 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 591 if (ext == NULL) 592 goto skip; 593 cp += sizeof("nibble:") - 1; 594 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 595 strncpy(ext->nsuffix, cp, i); 596 ext->nsuffix[i] = '\0'; 597 } 598 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 599 if (ext == NULL) 600 goto skip; 601 cp += sizeof("nibble2:") - 1; 602 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 603 strncpy(ext->nsuffix2, cp, i); 604 ext->nsuffix2[i] = '\0'; 605 } 606 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 607 cp += sizeof("v6revmode:") - 1; 608 /* "nibble" and "bitstring" used to be valid */ 609 if (!strncmp(cp, "single", sizeof("single") - 1)) { 610 statp->options |= RES_NO_NIBBLE2; 611 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 612 statp->options &= 613 ~RES_NO_NIBBLE2; 614 } 615 } 616 else { 617 /* XXX - print a warning here? */ 618 } 619 skip: 620 /* skip to next run of spaces */ 621 while (*cp && *cp != ' ' && *cp != '\t') 622 cp++; 623 } 624 } 625 626 #ifdef RESOLVSORT 627 /* XXX - should really support CIDR which means explicit masks always. */ 628 static u_int32_t 629 net_mask(in) /* XXX - should really use system's version of this */ 630 struct in_addr in; 631 { 632 register u_int32_t i = ntohl(in.s_addr); 633 634 if (IN_CLASSA(i)) 635 return (htonl(IN_CLASSA_NET)); 636 else if (IN_CLASSB(i)) 637 return (htonl(IN_CLASSB_NET)); 638 return (htonl(IN_CLASSC_NET)); 639 } 640 #endif 641 642 u_int 643 res_randomid(void) { 644 struct timeval now; 645 646 gettimeofday(&now, NULL); 647 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); 648 } 649 650 /* 651 * This routine is for closing the socket if a virtual circuit is used and 652 * the program wants to close it. This provides support for endhostent() 653 * which expects to close the socket. 654 * 655 * This routine is not expected to be user visible. 656 */ 657 void 658 res_nclose(res_state statp) { 659 int ns; 660 661 if (statp->_vcsock >= 0) { 662 (void) close(statp->_vcsock); 663 statp->_vcsock = -1; 664 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 665 } 666 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 667 if (statp->_u._ext.nssocks[ns] != -1) { 668 (void) close(statp->_u._ext.nssocks[ns]); 669 statp->_u._ext.nssocks[ns] = -1; 670 } 671 } 672 } 673 674 void 675 res_ndestroy(res_state statp) { 676 res_nclose(statp); 677 if (statp->_u._ext.ext != NULL) 678 free(statp->_u._ext.ext); 679 statp->options &= ~RES_INIT; 680 statp->_u._ext.ext = NULL; 681 } 682 683 const char * 684 res_get_nibblesuffix(res_state statp) { 685 if (statp->_u._ext.ext) 686 return (statp->_u._ext.ext->nsuffix); 687 return ("ip6.arpa"); 688 } 689 690 const char * 691 res_get_nibblesuffix2(res_state statp) { 692 if (statp->_u._ext.ext) 693 return (statp->_u._ext.ext->nsuffix2); 694 return ("ip6.int"); 695 } 696 697 void 698 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 699 int i, nserv; 700 size_t size; 701 702 /* close open servers */ 703 res_nclose(statp); 704 705 /* cause rtt times to be forgotten */ 706 statp->_u._ext.nscount = 0; 707 708 nserv = 0; 709 for (i = 0; i < cnt && nserv < MAXNS; i++) { 710 switch (set->sin.sin_family) { 711 case AF_INET: 712 size = sizeof(set->sin); 713 if (statp->_u._ext.ext) 714 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 715 &set->sin, size); 716 if (size <= sizeof(statp->nsaddr_list[nserv])) 717 memcpy(&statp->nsaddr_list[nserv], 718 &set->sin, size); 719 else 720 statp->nsaddr_list[nserv].sin_family = 0; 721 nserv++; 722 break; 723 724 #ifdef HAS_INET6_STRUCTS 725 case AF_INET6: 726 size = sizeof(set->sin6); 727 if (statp->_u._ext.ext) 728 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 729 &set->sin6, size); 730 if (size <= sizeof(statp->nsaddr_list[nserv])) 731 memcpy(&statp->nsaddr_list[nserv], 732 &set->sin6, size); 733 else 734 statp->nsaddr_list[nserv].sin_family = 0; 735 nserv++; 736 break; 737 #endif 738 739 default: 740 break; 741 } 742 set++; 743 } 744 statp->nscount = nserv; 745 746 } 747 748 int 749 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 750 int i; 751 size_t size; 752 u_int16_t family; 753 754 for (i = 0; i < statp->nscount && i < cnt; i++) { 755 if (statp->_u._ext.ext) 756 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 757 else 758 family = statp->nsaddr_list[i].sin_family; 759 760 switch (family) { 761 case AF_INET: 762 size = sizeof(set->sin); 763 if (statp->_u._ext.ext) 764 memcpy(&set->sin, 765 &statp->_u._ext.ext->nsaddrs[i], 766 size); 767 else 768 memcpy(&set->sin, &statp->nsaddr_list[i], 769 size); 770 break; 771 772 #ifdef HAS_INET6_STRUCTS 773 case AF_INET6: 774 size = sizeof(set->sin6); 775 if (statp->_u._ext.ext) 776 memcpy(&set->sin6, 777 &statp->_u._ext.ext->nsaddrs[i], 778 size); 779 else 780 memcpy(&set->sin6, &statp->nsaddr_list[i], 781 size); 782 break; 783 #endif 784 785 default: 786 set->sin.sin_family = 0; 787 break; 788 } 789 set++; 790 } 791 return (statp->nscount); 792 } 793