1 /* 2 * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved. 3 */ 4 5 6 /* 7 * Copyright (c) 1985, 1989, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 /* 40 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 41 * 42 * Permission to use, copy, modify, and distribute this software for any 43 * purpose with or without fee is hereby granted, provided that the above 44 * copyright notice and this permission notice appear in all copies, and that 45 * the name of Digital Equipment Corporation not be used in advertising or 46 * publicity pertaining to distribution of the document or software without 47 * specific, written prior permission. 48 * 49 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 50 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 51 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 52 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 53 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 54 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 55 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 56 * SOFTWARE. 57 */ 58 59 /* 60 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 61 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 62 * 63 * Permission to use, copy, modify, and distribute this software for any 64 * purpose with or without fee is hereby granted, provided that the above 65 * copyright notice and this permission notice appear in all copies. 66 * 67 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 68 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 69 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 70 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 71 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 72 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 73 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 74 */ 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 #ifndef HAVE_MD5 95 # include "../dst/md5.h" 96 #else 97 # ifdef SOLARIS2 98 # include <sys/md5.h> 99 # endif 100 #endif 101 #ifndef _MD5_H_ 102 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 103 #endif 104 105 106 #include "port_after.h" 107 108 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 109 #include <resolv.h> 110 111 /* ISC purposely put port_after.h before <resolv.h> to force in6 stuff 112 * (above) so we explicitly include port_resolv.h here */ 113 #include "port_resolv.h" 114 115 #include "res_private.h" 116 117 /*% Options. Should all be left alone. */ 118 #define RESOLVSORT 119 #define DEBUG 120 121 #ifdef SUNW_INITCHKIF 122 #include <net/if.h> 123 #include <netinet/if_ether.h> 124 #include <sys/sockio.h> 125 #define MAXIFS 8192 126 #endif /* SUNW_INITCHKIF */ 127 128 #ifdef SOLARIS2 129 #include <sys/systeminfo.h> 130 #endif 131 132 static void res_setoptions __P((res_state, const char *, const char *)); 133 134 #ifdef RESOLVSORT 135 static const char sort_mask[] = "/&"; 136 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 137 static u_int32_t net_mask __P((struct in_addr)); 138 #endif 139 140 #if !defined(isascii) /*%< XXX - could be a function */ 141 # define isascii(c) (!(c & 0200)) 142 #endif 143 144 /* 145 * Resolver state default settings. 146 */ 147 148 /*% 149 * Set up default settings. If the configuration file exist, the values 150 * there will have precedence. Otherwise, the server address is set to 151 * INADDR_ANY and the default domain name comes from the gethostname(). 152 * 153 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 154 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 155 * since it was noted that INADDR_ANY actually meant ``the first interface 156 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 157 * it had to be "up" in order for you to reach your own name server. It 158 * was later decided that since the recommended practice is to always 159 * install local static routes through 127.0.0.1 for all your network 160 * interfaces, that we could solve this problem without a code change. 161 * 162 * The configuration file should always be used, since it is the only way 163 * to specify a default domain. If you are running a server on your local 164 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 165 * in the configuration file. 166 * 167 * Return 0 if completes successfully, -1 on error 168 */ 169 int 170 res_ninit(res_state statp) { 171 extern int __res_vinit(res_state, int); 172 return (__res_vinit(statp, 0)); 173 } 174 175 /*% This function has to be reachable by res_data.c but not publically. */ 176 int 177 __res_vinit(res_state statp, int preinit) { 178 register FILE *fp; 179 register char *cp, **pp; 180 register int n; 181 char buf[BUFSIZ]; 182 int nserv = 0; /*%< number of nameserver records read from file */ 183 int haveenv = 0; 184 int havesearch = 0; 185 #ifdef RESOLVSORT 186 int nsort = 0; 187 char *net; 188 #endif 189 int dots; 190 union res_sockaddr_union u[2]; 191 int maxns = MAXNS; 192 193 RES_SET_H_ERRNO(statp, 0); 194 if (statp->_u._ext.ext != NULL) 195 res_ndestroy(statp); 196 197 if (!preinit) { 198 statp->retrans = RES_TIMEOUT; 199 statp->retry = RES_DFLRETRY; 200 statp->options = RES_DEFAULT; 201 res_rndinit(statp); 202 statp->id = res_nrandomid(statp); 203 } 204 205 memset(u, 0, sizeof(u)); 206 #ifdef USELOOPBACK 207 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 208 #else 209 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 210 #endif 211 u[nserv].sin.sin_family = AF_INET; 212 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 213 #ifdef HAVE_SA_LEN 214 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 215 #endif 216 nserv++; 217 #ifdef HAS_INET6_STRUCTS 218 #ifdef USELOOPBACK 219 u[nserv].sin6.sin6_addr = in6addr_loopback; 220 #else 221 u[nserv].sin6.sin6_addr = in6addr_any; 222 #endif 223 u[nserv].sin6.sin6_family = AF_INET6; 224 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 225 #ifdef HAVE_SA_LEN 226 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 227 #endif 228 nserv++; 229 #endif 230 statp->nscount = 0; 231 statp->ndots = 1; 232 statp->pfcode = 0; 233 statp->_vcsock = -1; 234 statp->_flags = 0; 235 statp->qhook = NULL; 236 statp->rhook = NULL; 237 statp->_u._ext.nscount = 0; 238 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 239 if (statp->_u._ext.ext != NULL) { 240 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 241 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 242 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 243 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 244 } else { 245 /* 246 * Historically res_init() rarely, if at all, failed. 247 * Examples and applications exist which do not check 248 * our return code. Furthermore several applications 249 * simply call us to get the systems domainname. So 250 * rather then immediately fail here we store the 251 * failure, which is returned later, in h_errno. And 252 * prevent the collection of 'nameserver' information 253 * by setting maxns to 0. Thus applications that fail 254 * to check our return code wont be able to make 255 * queries anyhow. 256 */ 257 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 258 maxns = 0; 259 } 260 #ifdef RESOLVSORT 261 statp->nsort = 0; 262 #endif 263 res_setservers(statp, u, nserv); 264 265 #ifdef SUNW_INITCHKIF 266 /* 267 * Short circuit res_init() if no non-loopback interfaces are up. This is 268 * done to avoid boot delays if "dns" comes before "files" in nsswitch.conf. 269 * An additional fix has been added to this code, to count all external 270 * interfaces, which includes the IPv6 interfaces. If no external interfaces 271 * are found, an additional check is carried out to determine if any deprecated 272 * interfaces are up. 273 */ 274 { 275 int s; 276 struct lifnum lifn; 277 278 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 279 perror("res_init: socket"); 280 goto freedata; 281 } 282 lifn.lifn_family = AF_UNSPEC; 283 lifn.lifn_flags = LIFC_EXTERNAL_SOURCE; 284 if (ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) { 285 close(s); 286 goto freedata; 287 } 288 if (lifn.lifn_count == 0) { 289 /* 290 * Check if there are any deprecated interfaces up 291 */ 292 struct lifconf lifc; 293 uchar_t *buf; 294 int buflen, i, int_up = 0; 295 296 lifn.lifn_flags = 0; 297 if ((ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) || 298 (lifn.lifn_count < 1)) { 299 close(s); 300 goto freedata; 301 } 302 303 buflen = lifn.lifn_count * sizeof (struct lifreq); 304 buf = (uchar_t *)malloc(buflen); 305 if (buf == NULL) { 306 close(s); 307 goto freedata; 308 } 309 310 lifc.lifc_family = AF_UNSPEC; 311 lifc.lifc_flags = 0; 312 lifc.lifc_len = buflen; 313 lifc.lifc_lifcu.lifcu_buf = (caddr_t)buf; 314 if (ioctl(s, SIOCGLIFCONF, (char *)&lifc) < 0) { 315 close(s); 316 free(buf); 317 goto freedata; 318 } 319 320 for (i = 0; i < lifn.lifn_count; ++i) { 321 struct lifreq *lreqp, lreq; 322 323 lreqp = (struct lifreq *)&lifc.lifc_req[i]; 324 strlcpy(lreq.lifr_name, lreqp->lifr_name, 325 sizeof (lreq.lifr_name)); 326 if (ioctl(s, SIOCGLIFFLAGS, &lreq) < 0) { 327 close(s); 328 free(buf); 329 goto freedata; 330 } 331 if ((lreq.lifr_flags & IFF_UP) && 332 !(lreq.lifr_flags & IFF_NOLOCAL) && 333 !(lreq.lifr_flags & IFF_NOXMIT) && 334 !(lreq.lifr_flags & IFF_LOOPBACK)) { 335 int_up = 1; 336 break; 337 } 338 } 339 free(buf); 340 341 if (!int_up) { 342 close(s); 343 goto freedata; 344 } 345 } 346 close(s); 347 } 348 #endif /* SUNW_INITCHKIF */ 349 350 #ifdef SOLARIS2 351 /* 352 * The old libresolv derived the defaultdomain from NIS/NIS+. 353 * We want to keep this behaviour 354 */ 355 { 356 char buf[sizeof(statp->defdname)], *cp; 357 int ret; 358 359 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 360 (unsigned int)ret <= sizeof(buf)) { 361 if (buf[0] == '+') 362 buf[0] = '.'; 363 cp = strchr(buf, '.'); 364 cp = (cp == NULL) ? buf : (cp + 1); 365 strncpy(statp->defdname, cp, 366 sizeof(statp->defdname) - 1); 367 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 368 } 369 } 370 #endif /* SOLARIS2 */ 371 372 /* Allow user to override the local domain definition */ 373 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 374 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 375 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 376 haveenv++; 377 378 /* 379 * Set search list to be blank-separated strings 380 * from rest of env value. Permits users of LOCALDOMAIN 381 * to still have a search list, and anyone to set the 382 * one that they want to use as an individual (even more 383 * important now that the rfc1535 stuff restricts searches) 384 */ 385 cp = statp->defdname; 386 pp = statp->dnsrch; 387 *pp++ = cp; 388 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 389 if (*cp == '\n') /*%< silly backwards compat */ 390 break; 391 else if (*cp == ' ' || *cp == '\t') { 392 *cp = 0; 393 n = 1; 394 } else if (n) { 395 *pp++ = cp; 396 n = 0; 397 havesearch = 1; 398 } 399 } 400 /* null terminate last domain if there are excess */ 401 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 402 cp++; 403 *cp = '\0'; 404 *pp++ = 0; 405 } 406 407 #define MATCH(line, name) \ 408 (!strncmp(line, name, sizeof(name) - 1) && \ 409 (line[sizeof(name) - 1] == ' ' || \ 410 line[sizeof(name) - 1] == '\t')) 411 412 nserv = 0; 413 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 414 /* read the config file */ 415 while (fgets(buf, sizeof(buf), fp) != NULL) { 416 /* skip comments */ 417 if (*buf == ';' || *buf == '#') 418 continue; 419 /* read default domain name */ 420 if (MATCH(buf, "domain")) { 421 if (haveenv) /*%< skip if have from environ */ 422 continue; 423 cp = buf + sizeof("domain") - 1; 424 while (*cp == ' ' || *cp == '\t') 425 cp++; 426 if ((*cp == '\0') || (*cp == '\n')) 427 continue; 428 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 429 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 430 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 431 *cp = '\0'; 432 havesearch = 0; 433 continue; 434 } 435 /* set search list */ 436 if (MATCH(buf, "search")) { 437 if (haveenv) /*%< skip if have from environ */ 438 continue; 439 cp = buf + sizeof("search") - 1; 440 while (*cp == ' ' || *cp == '\t') 441 cp++; 442 if ((*cp == '\0') || (*cp == '\n')) 443 continue; 444 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 445 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 446 if ((cp = strchr(statp->defdname, '\n')) != NULL) 447 *cp = '\0'; 448 /* 449 * Set search list to be blank-separated strings 450 * on rest of line. 451 */ 452 cp = statp->defdname; 453 pp = statp->dnsrch; 454 *pp++ = cp; 455 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 456 if (*cp == ' ' || *cp == '\t') { 457 *cp = 0; 458 n = 1; 459 } else if (n) { 460 *pp++ = cp; 461 n = 0; 462 } 463 } 464 /* null terminate last domain if there are excess */ 465 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 466 cp++; 467 *cp = '\0'; 468 *pp++ = 0; 469 havesearch = 1; 470 continue; 471 } 472 /* read nameservers to query */ 473 if (MATCH(buf, "nameserver") && nserv < maxns) { 474 struct addrinfo hints, *ai; 475 char sbuf[NI_MAXSERV]; 476 const size_t minsiz = 477 sizeof(statp->_u._ext.ext->nsaddrs[0]); 478 479 cp = buf + sizeof("nameserver") - 1; 480 while (*cp == ' ' || *cp == '\t') 481 cp++; 482 cp[strcspn(cp, ";# \t\n")] = '\0'; 483 if ((*cp != '\0') && (*cp != '\n')) { 484 memset(&hints, 0, sizeof(hints)); 485 hints.ai_family = PF_UNSPEC; 486 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 487 hints.ai_flags = AI_NUMERICHOST; 488 sprintf(sbuf, "%u", NAMESERVER_PORT); 489 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 490 ai->ai_addrlen <= minsiz) { 491 if (statp->_u._ext.ext != NULL) { 492 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 493 ai->ai_addr, ai->ai_addrlen); 494 } 495 if (ai->ai_addrlen <= 496 sizeof(statp->nsaddr_list[nserv])) { 497 memcpy(&statp->nsaddr_list[nserv], 498 ai->ai_addr, ai->ai_addrlen); 499 } else 500 statp->nsaddr_list[nserv].sin_family = 0; 501 freeaddrinfo(ai); 502 nserv++; 503 } 504 } 505 continue; 506 } 507 #ifdef RESOLVSORT 508 if (MATCH(buf, "sortlist")) { 509 struct in_addr a; 510 511 cp = buf + sizeof("sortlist") - 1; 512 while (nsort < MAXRESOLVSORT) { 513 while (*cp == ' ' || *cp == '\t') 514 cp++; 515 if (*cp == '\0' || *cp == '\n' || *cp == ';') 516 break; 517 net = cp; 518 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 519 isascii(*cp) && !isspace((unsigned char)*cp)) 520 cp++; 521 n = *cp; 522 *cp = 0; 523 if (inet_aton(net, &a)) { 524 statp->sort_list[nsort].addr = a; 525 if (ISSORTMASK(n)) { 526 *cp++ = n; 527 net = cp; 528 while (*cp && *cp != ';' && 529 isascii(*cp) && 530 !isspace((unsigned char)*cp)) 531 cp++; 532 n = *cp; 533 *cp = 0; 534 if (inet_aton(net, &a)) { 535 statp->sort_list[nsort].mask = a.s_addr; 536 } else { 537 statp->sort_list[nsort].mask = 538 net_mask(statp->sort_list[nsort].addr); 539 } 540 } else { 541 statp->sort_list[nsort].mask = 542 net_mask(statp->sort_list[nsort].addr); 543 } 544 nsort++; 545 } 546 *cp = n; 547 } 548 continue; 549 } 550 #endif 551 if (MATCH(buf, "options")) { 552 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 553 continue; 554 } 555 } 556 if (nserv > 0) 557 statp->nscount = nserv; 558 #ifdef RESOLVSORT 559 statp->nsort = nsort; 560 #endif 561 (void) fclose(fp); 562 } 563 /* 564 * Last chance to get a nameserver. This should not normally 565 * be necessary 566 */ 567 #ifdef NO_RESOLV_CONF 568 if(nserv == 0) 569 nserv = get_nameservers(statp); 570 #endif 571 572 if (statp->defdname[0] == 0 && 573 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 574 (cp = strchr(buf, '.')) != NULL) 575 strcpy(statp->defdname, cp + 1); 576 577 /* find components of local domain that might be searched */ 578 if (havesearch == 0) { 579 pp = statp->dnsrch; 580 *pp++ = statp->defdname; 581 *pp = NULL; 582 583 dots = 0; 584 for (cp = statp->defdname; *cp; cp++) 585 dots += (*cp == '.'); 586 587 cp = statp->defdname; 588 while (pp < statp->dnsrch + MAXDFLSRCH) { 589 if (dots < LOCALDOMAINPARTS) 590 break; 591 cp = strchr(cp, '.') + 1; /*%< we know there is one */ 592 *pp++ = cp; 593 dots--; 594 } 595 *pp = NULL; 596 #ifdef DEBUG 597 if (statp->options & RES_DEBUG) { 598 printf(";; res_init()... default dnsrch list:\n"); 599 for (pp = statp->dnsrch; *pp; pp++) 600 printf(";;\t%s\n", *pp); 601 printf(";;\t..END..\n"); 602 } 603 #endif 604 } 605 606 if ((cp = getenv("RES_OPTIONS")) != NULL) 607 res_setoptions(statp, cp, "env"); 608 statp->options |= RES_INIT; 609 return (statp->res_h_errno); 610 #ifdef SUNW_INITCHKIF 611 freedata: 612 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 613 if (statp->_u._ext.ext != NULL) { 614 free(statp->_u._ext.ext); 615 statp->_u._ext.ext = NULL; 616 } 617 return (-1); 618 #endif /* SUNW_INITCHKIF */ 619 620 } 621 622 static void 623 res_setoptions(res_state statp, const char *options, const char *source) 624 { 625 const char *cp = options; 626 int i; 627 struct __res_state_ext *ext = statp->_u._ext.ext; 628 629 #ifdef DEBUG 630 if (statp->options & RES_DEBUG) 631 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 632 options, source); 633 #endif 634 while (*cp) { 635 /* skip leading and inner runs of spaces */ 636 while (*cp == ' ' || *cp == '\t') 637 cp++; 638 /* search for and process individual options */ 639 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 640 i = atoi(cp + sizeof("ndots:") - 1); 641 if (i <= RES_MAXNDOTS) 642 statp->ndots = i; 643 else 644 statp->ndots = RES_MAXNDOTS; 645 #ifdef DEBUG 646 if (statp->options & RES_DEBUG) 647 printf(";;\tndots=%d\n", statp->ndots); 648 #endif 649 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 650 i = atoi(cp + sizeof("timeout:") - 1); 651 if (i <= RES_MAXRETRANS) 652 statp->retrans = i; 653 else 654 statp->retrans = RES_MAXRETRANS; 655 #ifdef DEBUG 656 if (statp->options & RES_DEBUG) 657 printf(";;\ttimeout=%d\n", statp->retrans); 658 #endif 659 #ifdef SOLARIS2 660 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 661 /* 662 * For backward compatibility, 'retrans' is 663 * supported as an alias for 'timeout', though 664 * without an imposed maximum. 665 */ 666 statp->retrans = atoi(cp + sizeof("retrans:") - 1); 667 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 668 /* 669 * For backward compatibility, 'retry' is 670 * supported as an alias for 'attempts', though 671 * without an imposed maximum. 672 */ 673 statp->retry = atoi(cp + sizeof("retry:") - 1); 674 #endif /* SOLARIS2 */ 675 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 676 i = atoi(cp + sizeof("attempts:") - 1); 677 if (i <= RES_MAXRETRY) 678 statp->retry = i; 679 else 680 statp->retry = RES_MAXRETRY; 681 #ifdef DEBUG 682 if (statp->options & RES_DEBUG) 683 printf(";;\tattempts=%d\n", statp->retry); 684 #endif 685 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 686 #ifdef DEBUG 687 if (!(statp->options & RES_DEBUG)) { 688 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 689 options, source); 690 statp->options |= RES_DEBUG; 691 } 692 printf(";;\tdebug\n"); 693 #endif 694 } else if (!strncmp(cp, "no_tld_query", 695 sizeof("no_tld_query") - 1) || 696 !strncmp(cp, "no-tld-query", 697 sizeof("no-tld-query") - 1)) { 698 statp->options |= RES_NOTLDQUERY; 699 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 700 statp->options |= RES_USE_INET6; 701 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 702 statp->options |= RES_ROTATE; 703 } else if (!strncmp(cp, "no-check-names", 704 sizeof("no-check-names") - 1)) { 705 statp->options |= RES_NOCHECKNAME; 706 } 707 #ifdef RES_USE_EDNS0 708 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 709 statp->options |= RES_USE_EDNS0; 710 } 711 #endif 712 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 713 statp->options |= RES_USE_DNAME; 714 } 715 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 716 if (ext == NULL) 717 goto skip; 718 cp += sizeof("nibble:") - 1; 719 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 720 strncpy(ext->nsuffix, cp, i); 721 ext->nsuffix[i] = '\0'; 722 } 723 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 724 if (ext == NULL) 725 goto skip; 726 cp += sizeof("nibble2:") - 1; 727 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 728 strncpy(ext->nsuffix2, cp, i); 729 ext->nsuffix2[i] = '\0'; 730 } 731 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 732 cp += sizeof("v6revmode:") - 1; 733 /* "nibble" and "bitstring" used to be valid */ 734 if (!strncmp(cp, "single", sizeof("single") - 1)) { 735 statp->options |= RES_NO_NIBBLE2; 736 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 737 statp->options &= 738 ~RES_NO_NIBBLE2; 739 } 740 } 741 else { 742 /* XXX - print a warning here? */ 743 } 744 skip: 745 /* skip to next run of spaces */ 746 while (*cp && *cp != ' ' && *cp != '\t') 747 cp++; 748 } 749 } 750 751 #ifdef RESOLVSORT 752 /* XXX - should really support CIDR which means explicit masks always. */ 753 static u_int32_t 754 net_mask(in) /*!< XXX - should really use system's version of this */ 755 struct in_addr in; 756 { 757 register u_int32_t i = ntohl(in.s_addr); 758 759 if (IN_CLASSA(i)) 760 return (htonl(IN_CLASSA_NET)); 761 else if (IN_CLASSB(i)) 762 return (htonl(IN_CLASSB_NET)); 763 return (htonl(IN_CLASSC_NET)); 764 } 765 #endif 766 767 void 768 res_rndinit(res_state statp) 769 { 770 struct timeval now; 771 u_int32_t u32; 772 u_int16_t u16; 773 774 gettimeofday(&now, NULL); 775 u32 = now.tv_sec; 776 memcpy(statp->_u._ext._rnd, &u32, 4); 777 u32 = now.tv_usec; 778 memcpy(statp->_u._ext._rnd + 4, &u32, 4); 779 u32 += now.tv_sec; 780 memcpy(statp->_u._ext._rnd + 8, &u32, 4); 781 u16 = getpid(); 782 memcpy(statp->_u._ext._rnd + 12, &u16, 2); 783 784 } 785 786 u_int 787 res_nrandomid(res_state statp) { 788 struct timeval now; 789 u_int16_t u16; 790 MD5_CTX ctx; 791 792 gettimeofday(&now, NULL); 793 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 794 795 memcpy(statp->_u._ext._rnd + 14, &u16, 2); 796 #ifndef HAVE_MD5 797 MD5_Init(&ctx); 798 MD5_Update(&ctx, statp->_u._ext._rnd, 16); 799 MD5_Final(statp->_u._ext._rnd, &ctx); 800 #else 801 MD5Init(&ctx); 802 MD5Update(&ctx, statp->_u._ext._rnd, 16); 803 MD5Final(statp->_u._ext._rnd, &ctx); 804 #endif 805 memcpy(&u16, statp->_u._ext._rnd + 14, 2); 806 return ((u_int) u16); 807 } 808 809 /*% 810 * This routine is for closing the socket if a virtual circuit is used and 811 * the program wants to close it. This provides support for endhostent() 812 * which expects to close the socket. 813 * 814 * This routine is not expected to be user visible. 815 */ 816 void 817 res_nclose(res_state statp) { 818 int ns; 819 820 if (statp->_vcsock >= 0) { 821 (void) close(statp->_vcsock); 822 statp->_vcsock = -1; 823 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 824 } 825 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 826 if (statp->_u._ext.nssocks[ns] != -1) { 827 (void) close(statp->_u._ext.nssocks[ns]); 828 statp->_u._ext.nssocks[ns] = -1; 829 } 830 } 831 } 832 833 void 834 res_ndestroy(res_state statp) { 835 res_nclose(statp); 836 if (statp->_u._ext.ext != NULL) 837 free(statp->_u._ext.ext); 838 statp->options &= ~RES_INIT; 839 statp->_u._ext.ext = NULL; 840 } 841 842 const char * 843 res_get_nibblesuffix(res_state statp) { 844 if (statp->_u._ext.ext) 845 return (statp->_u._ext.ext->nsuffix); 846 return ("ip6.arpa"); 847 } 848 849 const char * 850 res_get_nibblesuffix2(res_state statp) { 851 if (statp->_u._ext.ext) 852 return (statp->_u._ext.ext->nsuffix2); 853 return ("ip6.int"); 854 } 855 856 void 857 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 858 int i, nserv; 859 size_t size; 860 861 /* close open servers */ 862 res_nclose(statp); 863 864 /* cause rtt times to be forgotten */ 865 statp->_u._ext.nscount = 0; 866 867 nserv = 0; 868 for (i = 0; i < cnt && nserv < MAXNS; i++) { 869 switch (set->sin.sin_family) { 870 case AF_INET: 871 size = sizeof(set->sin); 872 if (statp->_u._ext.ext) 873 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 874 &set->sin, size); 875 if (size <= sizeof(statp->nsaddr_list[nserv])) 876 memcpy(&statp->nsaddr_list[nserv], 877 &set->sin, size); 878 else 879 statp->nsaddr_list[nserv].sin_family = 0; 880 nserv++; 881 break; 882 883 #ifdef HAS_INET6_STRUCTS 884 case AF_INET6: 885 size = sizeof(set->sin6); 886 if (statp->_u._ext.ext) 887 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 888 &set->sin6, size); 889 if (size <= sizeof(statp->nsaddr_list[nserv])) 890 memcpy(&statp->nsaddr_list[nserv], 891 &set->sin6, size); 892 else 893 statp->nsaddr_list[nserv].sin_family = 0; 894 nserv++; 895 break; 896 #endif 897 898 default: 899 break; 900 } 901 set++; 902 } 903 statp->nscount = nserv; 904 905 } 906 907 int 908 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 909 int i; 910 size_t size; 911 u_int16_t family; 912 913 for (i = 0; i < statp->nscount && i < cnt; i++) { 914 if (statp->_u._ext.ext) 915 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 916 else 917 family = statp->nsaddr_list[i].sin_family; 918 919 switch (family) { 920 case AF_INET: 921 size = sizeof(set->sin); 922 if (statp->_u._ext.ext) 923 memcpy(&set->sin, 924 &statp->_u._ext.ext->nsaddrs[i], 925 size); 926 else 927 memcpy(&set->sin, &statp->nsaddr_list[i], 928 size); 929 break; 930 931 #ifdef HAS_INET6_STRUCTS 932 case AF_INET6: 933 size = sizeof(set->sin6); 934 if (statp->_u._ext.ext) 935 memcpy(&set->sin6, 936 &statp->_u._ext.ext->nsaddrs[i], 937 size); 938 else 939 memcpy(&set->sin6, &statp->nsaddr_list[i], 940 size); 941 break; 942 #endif 943 944 default: 945 set->sin.sin_family = 0; 946 break; 947 } 948 set++; 949 } 950 return (statp->nscount); 951 } 952 953 /*! \file */ 954