1 /* $NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 */ 55 56 /* 57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 59 * 60 * Permission to use, copy, modify, and distribute this software for any 61 * purpose with or without fee is hereby granted, provided that the above 62 * copyright notice and this permission notice appear in all copies. 63 * 64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #include <sys/cdefs.h> 74 #if defined(LIBC_SCCS) && !defined(lint) 75 #ifdef notdef 76 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 77 static const char rcsid[] = "Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp"; 78 #else 79 __RCSID("$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $"); 80 #endif 81 #endif /* LIBC_SCCS and not lint */ 82 83 84 85 #include <sys/types.h> 86 #include <sys/param.h> 87 #include <sys/socket.h> 88 #include <sys/time.h> 89 90 #include <netinet/in.h> 91 #include <arpa/inet.h> 92 #include <arpa/nameser.h> 93 94 #include <ctype.h> 95 #include <stdio.h> 96 #include <stdlib.h> 97 #include <string.h> 98 #include <unistd.h> 99 #include <netdb.h> 100 101 #ifdef ANDROID_CHANGES 102 #include <errno.h> 103 #include <fcntl.h> 104 #endif /* ANDROID_CHANGES */ 105 106 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 107 #ifdef ANDROID_CHANGES 108 #include "resolv_netid.h" 109 #include "resolv_private.h" 110 #else 111 #include <resolv.h> 112 #endif 113 114 #include "res_private.h" 115 116 /* Options. Should all be left alone. */ 117 #ifndef DEBUG 118 #define DEBUG 119 #endif 120 121 static void res_setoptions __P((res_state, const char *, const char *)); 122 123 #ifdef RESOLVSORT 124 static const char sort_mask[] = "/&"; 125 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 126 static uint32_t net_mask(struct in_addr); 127 #endif 128 129 #if !defined(isascii) /* XXX - could be a function */ 130 # define isascii(c) (!(c & 0200)) 131 #endif 132 133 /* 134 * Resolver state default settings. 135 */ 136 137 /* 138 * Set up default settings. If the configuration file exist, the values 139 * there will have precedence. Otherwise, the server address is set to 140 * INADDR_ANY and the default domain name comes from the gethostname(). 141 * 142 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 143 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 144 * since it was noted that INADDR_ANY actually meant ``the first interface 145 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 146 * it had to be "up" in order for you to reach your own name server. It 147 * was later decided that since the recommended practice is to always 148 * install local static routes through 127.0.0.1 for all your network 149 * interfaces, that we could solve this problem without a code change. 150 * 151 * The configuration file should always be used, since it is the only way 152 * to specify a default domain. If you are running a server on your local 153 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 154 * in the configuration file. 155 * 156 * Return 0 if completes successfully, -1 on error 157 */ 158 int 159 res_ninit(res_state statp) { 160 extern int __res_vinit(res_state, int); 161 162 return (__res_vinit(statp, 0)); 163 } 164 165 /* This function has to be reachable by res_data.c but not publicly. */ 166 int 167 __res_vinit(res_state statp, int preinit) { 168 #if !defined(__BIONIC__) 169 register FILE *fp; 170 #endif 171 register char *cp, **pp; 172 #if !defined(__BIONIC__) 173 register int n; 174 #endif 175 char buf[BUFSIZ]; 176 int nserv = 0; /* number of nameserver records read from file */ 177 #if !defined(__BIONIC__) 178 int haveenv = 0; 179 #endif 180 int havesearch = 0; 181 #ifdef RESOLVSORT 182 int nsort = 0; 183 #endif 184 #if !defined(__BIONIC__) 185 char *net; 186 #endif 187 int dots; 188 union res_sockaddr_union u[2]; 189 190 if ((statp->options & RES_INIT) != 0U) 191 res_ndestroy(statp); 192 193 if (!preinit) { 194 statp->netid = NETID_UNSET; 195 statp->retrans = RES_TIMEOUT; 196 statp->retry = RES_DFLRETRY; 197 statp->options = RES_DEFAULT; 198 statp->id = res_randomid(); 199 statp->_mark = MARK_UNSET; 200 } 201 202 memset(u, 0, sizeof(u)); 203 #ifdef USELOOPBACK 204 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 205 #else 206 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 207 #endif 208 u[nserv].sin.sin_family = AF_INET; 209 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 210 #ifdef HAVE_SA_LEN 211 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 212 #endif 213 nserv++; 214 #ifdef HAS_INET6_STRUCTS 215 #ifdef USELOOPBACK 216 u[nserv].sin6.sin6_addr = in6addr_loopback; 217 #else 218 u[nserv].sin6.sin6_addr = in6addr_any; 219 #endif 220 u[nserv].sin6.sin6_family = AF_INET6; 221 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 222 #ifdef HAVE_SA_LEN 223 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 224 #endif 225 nserv++; 226 #endif 227 statp->nscount = 0; 228 statp->ndots = 1; 229 statp->pfcode = 0; 230 statp->_vcsock = -1; 231 statp->_flags = 0; 232 statp->qhook = NULL; 233 statp->rhook = NULL; 234 statp->_u._ext.nscount = 0; 235 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 236 if (statp->_u._ext.ext != NULL) { 237 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 238 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 239 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 240 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 241 } 242 statp->nsort = 0; 243 res_setservers(statp, u, nserv); 244 245 #if defined(__BIONIC__) 246 /* Ignore the environment. */ 247 #else 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 if (nserv > 0) 283 statp->nscount = nserv; 284 #endif 285 286 #ifndef ANDROID_CHANGES /* !ANDROID_CHANGES - IGNORE resolv.conf in Android */ 287 #define MATCH(line, name) \ 288 (!strncmp(line, name, sizeof(name) - 1) && \ 289 (line[sizeof(name) - 1] == ' ' || \ 290 line[sizeof(name) - 1] == '\t')) 291 292 nserv = 0; 293 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 294 /* read the config file */ 295 while (fgets(buf, sizeof(buf), fp) != NULL) { 296 /* skip comments */ 297 if (*buf == ';' || *buf == '#') 298 continue; 299 /* read default domain name */ 300 if (MATCH(buf, "domain")) { 301 if (haveenv) /* skip if have from environ */ 302 continue; 303 cp = buf + sizeof("domain") - 1; 304 while (*cp == ' ' || *cp == '\t') 305 cp++; 306 if ((*cp == '\0') || (*cp == '\n')) 307 continue; 308 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 309 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 310 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 311 *cp = '\0'; 312 havesearch = 0; 313 continue; 314 } 315 /* set search list */ 316 if (MATCH(buf, "search")) { 317 if (haveenv) /* skip if have from environ */ 318 continue; 319 cp = buf + sizeof("search") - 1; 320 while (*cp == ' ' || *cp == '\t') 321 cp++; 322 if ((*cp == '\0') || (*cp == '\n')) 323 continue; 324 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 325 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 326 if ((cp = strchr(statp->defdname, '\n')) != NULL) 327 *cp = '\0'; 328 /* 329 * Set search list to be blank-separated strings 330 * on rest of line. 331 */ 332 cp = statp->defdname; 333 pp = statp->dnsrch; 334 *pp++ = cp; 335 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 336 if (*cp == ' ' || *cp == '\t') { 337 *cp = 0; 338 n = 1; 339 } else if (n) { 340 *pp++ = cp; 341 n = 0; 342 } 343 } 344 /* null terminate last domain if there are excess */ 345 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 346 cp++; 347 *cp = '\0'; 348 *pp++ = 0; 349 havesearch = 1; 350 continue; 351 } 352 /* read nameservers to query */ 353 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 354 struct addrinfo hints, *ai; 355 char sbuf[NI_MAXSERV]; 356 const size_t minsiz = 357 sizeof(statp->_u._ext.ext->nsaddrs[0]); 358 359 cp = buf + sizeof("nameserver") - 1; 360 while (*cp == ' ' || *cp == '\t') 361 cp++; 362 cp[strcspn(cp, ";# \t\n")] = '\0'; 363 if ((*cp != '\0') && (*cp != '\n')) { 364 memset(&hints, 0, sizeof(hints)); 365 hints.ai_family = PF_UNSPEC; 366 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 367 hints.ai_flags = AI_NUMERICHOST; 368 sprintf(sbuf, "%u", NAMESERVER_PORT); 369 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 370 ai->ai_addrlen <= minsiz) { 371 if (statp->_u._ext.ext != NULL) { 372 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 373 ai->ai_addr, ai->ai_addrlen); 374 } 375 if (ai->ai_addrlen <= 376 sizeof(statp->nsaddr_list[nserv])) { 377 memcpy(&statp->nsaddr_list[nserv], 378 ai->ai_addr, ai->ai_addrlen); 379 } else 380 statp->nsaddr_list[nserv].sin_family = 0; 381 freeaddrinfo(ai); 382 nserv++; 383 } 384 } 385 continue; 386 } 387 if (MATCH(buf, "sortlist")) { 388 struct in_addr a; 389 390 cp = buf + sizeof("sortlist") - 1; 391 while (nsort < MAXRESOLVSORT) { 392 while (*cp == ' ' || *cp == '\t') 393 cp++; 394 if (*cp == '\0' || *cp == '\n' || *cp == ';') 395 break; 396 net = cp; 397 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 398 isascii(*cp) && !isspace((unsigned char)*cp)) 399 cp++; 400 n = *cp; 401 *cp = 0; 402 if (inet_aton(net, &a)) { 403 statp->sort_list[nsort].addr = a; 404 if (ISSORTMASK(n)) { 405 *cp++ = n; 406 net = cp; 407 while (*cp && *cp != ';' && 408 isascii(*cp) && 409 !isspace((unsigned char)*cp)) 410 cp++; 411 n = *cp; 412 *cp = 0; 413 if (inet_aton(net, &a)) { 414 statp->sort_list[nsort].mask = a.s_addr; 415 } else { 416 statp->sort_list[nsort].mask = 417 net_mask(statp->sort_list[nsort].addr); 418 } 419 } else { 420 statp->sort_list[nsort].mask = 421 net_mask(statp->sort_list[nsort].addr); 422 } 423 nsort++; 424 } 425 *cp = n; 426 } 427 continue; 428 } 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 statp->nsort = nsort; 437 (void) fclose(fp); 438 } 439 #endif /* !ANDROID_CHANGES */ 440 /* 441 * Last chance to get a nameserver. This should not normally 442 * be necessary 443 */ 444 #ifdef NO_RESOLV_CONF 445 if(nserv == 0) 446 nserv = get_nameservers(statp); 447 #endif 448 449 if (statp->defdname[0] == 0 && 450 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 451 (cp = strchr(buf, '.')) != NULL) 452 strcpy(statp->defdname, cp + 1); 453 454 /* find components of local domain that might be searched */ 455 if (havesearch == 0) { 456 pp = statp->dnsrch; 457 *pp++ = statp->defdname; 458 *pp = NULL; 459 460 dots = 0; 461 for (cp = statp->defdname; *cp; cp++) 462 dots += (*cp == '.'); 463 464 cp = statp->defdname; 465 while (pp < statp->dnsrch + MAXDFLSRCH) { 466 if (dots < LOCALDOMAINPARTS) 467 break; 468 cp = strchr(cp, '.') + 1; /* we know there is one */ 469 *pp++ = cp; 470 dots--; 471 } 472 *pp = NULL; 473 #ifdef DEBUG 474 if (statp->options & RES_DEBUG) { 475 printf(";; res_init()... default dnsrch list:\n"); 476 for (pp = statp->dnsrch; *pp; pp++) 477 printf(";;\t%s\n", *pp); 478 printf(";;\t..END..\n"); 479 } 480 #endif 481 } 482 483 if ((cp = getenv("RES_OPTIONS")) != NULL) 484 res_setoptions(statp, cp, "env"); 485 if (nserv > 0) { 486 statp->nscount = nserv; 487 statp->options |= RES_INIT; 488 } 489 return (0); 490 } 491 492 static void 493 res_setoptions(res_state statp, const char *options, const char *source) 494 { 495 const char *cp = options; 496 int i; 497 struct __res_state_ext *ext = statp->_u._ext.ext; 498 499 #ifdef DEBUG 500 if (statp->options & RES_DEBUG) 501 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 502 options, source); 503 #endif 504 while (*cp) { 505 /* skip leading and inner runs of spaces */ 506 while (*cp == ' ' || *cp == '\t') 507 cp++; 508 /* search for and process individual options */ 509 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 510 i = atoi(cp + sizeof("ndots:") - 1); 511 if (i <= RES_MAXNDOTS) 512 statp->ndots = i; 513 else 514 statp->ndots = RES_MAXNDOTS; 515 #ifdef DEBUG 516 if (statp->options & RES_DEBUG) 517 printf(";;\tndots=%d\n", statp->ndots); 518 #endif 519 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 520 i = atoi(cp + sizeof("timeout:") - 1); 521 if (i <= RES_MAXRETRANS) 522 statp->retrans = i; 523 else 524 statp->retrans = RES_MAXRETRANS; 525 #ifdef DEBUG 526 if (statp->options & RES_DEBUG) 527 printf(";;\ttimeout=%d\n", statp->retrans); 528 #endif 529 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 530 i = atoi(cp + sizeof("attempts:") - 1); 531 if (i <= RES_MAXRETRY) 532 statp->retry = i; 533 else 534 statp->retry = RES_MAXRETRY; 535 #ifdef DEBUG 536 if (statp->options & RES_DEBUG) 537 printf(";;\tattempts=%d\n", statp->retry); 538 #endif 539 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 540 #ifdef DEBUG 541 if (!(statp->options & RES_DEBUG)) { 542 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 543 options, source); 544 statp->options |= RES_DEBUG; 545 } 546 printf(";;\tdebug\n"); 547 #endif 548 } else if (!strncmp(cp, "no_tld_query", 549 sizeof("no_tld_query") - 1) || 550 !strncmp(cp, "no-tld-query", 551 sizeof("no-tld-query") - 1)) { 552 statp->options |= RES_NOTLDQUERY; 553 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 554 statp->options |= RES_USE_INET6; 555 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 556 statp->options |= RES_ROTATE; 557 } else if (!strncmp(cp, "no-check-names", 558 sizeof("no-check-names") - 1)) { 559 statp->options |= RES_NOCHECKNAME; 560 } 561 #ifdef RES_USE_EDNS0 562 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 563 statp->options |= RES_USE_EDNS0; 564 } 565 #endif 566 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 567 statp->options |= RES_USE_DNAME; 568 } 569 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 570 if (ext == NULL) 571 goto skip; 572 cp += sizeof("nibble:") - 1; 573 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 574 strncpy(ext->nsuffix, cp, (size_t)i); 575 ext->nsuffix[i] = '\0'; 576 } 577 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 578 if (ext == NULL) 579 goto skip; 580 cp += sizeof("nibble2:") - 1; 581 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 582 strncpy(ext->nsuffix2, cp, (size_t)i); 583 ext->nsuffix2[i] = '\0'; 584 } 585 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 586 cp += sizeof("v6revmode:") - 1; 587 /* "nibble" and "bitstring" used to be valid */ 588 if (!strncmp(cp, "single", sizeof("single") - 1)) { 589 statp->options |= RES_NO_NIBBLE2; 590 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 591 statp->options &= 592 ~RES_NO_NIBBLE2; 593 } 594 } 595 else { 596 /* XXX - print a warning here? */ 597 } 598 skip: 599 /* skip to next run of spaces */ 600 while (*cp && *cp != ' ' && *cp != '\t') 601 cp++; 602 } 603 } 604 605 #ifdef RESOLVSORT 606 /* XXX - should really support CIDR which means explicit masks always. */ 607 static uint32_t 608 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 609 { 610 register uint32_t i = ntohl(in.s_addr); 611 612 if (IN_CLASSA(i)) 613 return (htonl(IN_CLASSA_NET)); 614 else if (IN_CLASSB(i)) 615 return (htonl(IN_CLASSB_NET)); 616 return (htonl(IN_CLASSC_NET)); 617 } 618 #endif 619 620 /*% 621 * This routine is for closing the socket if a virtual circuit is used and 622 * the program wants to close it. This provides support for endhostent() 623 * which expects to close the socket. 624 * 625 * This routine is not expected to be user visible. 626 */ 627 void 628 res_nclose(res_state statp) 629 { 630 int ns; 631 632 if (statp->_vcsock >= 0) { 633 (void) close(statp->_vcsock); 634 statp->_vcsock = -1; 635 statp->_flags &= ~(RES_F_VC | RES_F_CONN); 636 } 637 for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 638 if (statp->_u._ext.nssocks[ns] != -1) { 639 (void) close(statp->_u._ext.nssocks[ns]); 640 statp->_u._ext.nssocks[ns] = -1; 641 } 642 } 643 } 644 645 void 646 res_ndestroy(res_state statp) 647 { 648 res_nclose(statp); 649 if (statp->_u._ext.ext != NULL) 650 free(statp->_u._ext.ext); 651 statp->options &= ~RES_INIT; 652 statp->_u._ext.ext = NULL; 653 } 654 655 const char * 656 res_get_nibblesuffix(res_state statp) 657 { 658 if (statp->_u._ext.ext) 659 return (statp->_u._ext.ext->nsuffix); 660 return ("ip6.arpa"); 661 } 662 663 const char * 664 res_get_nibblesuffix2(res_state statp) 665 { 666 if (statp->_u._ext.ext) 667 return (statp->_u._ext.ext->nsuffix2); 668 return ("ip6.int"); 669 } 670 671 void 672 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) 673 { 674 int i, nserv; 675 size_t size; 676 677 /* close open servers */ 678 res_nclose(statp); 679 680 /* cause rtt times to be forgotten */ 681 statp->_u._ext.nscount = 0; 682 683 nserv = 0; 684 for (i = 0; i < cnt && nserv < MAXNS; i++) { 685 switch (set->sin.sin_family) { 686 case AF_INET: 687 size = sizeof(set->sin); 688 if (statp->_u._ext.ext) 689 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 690 &set->sin, size); 691 if (size <= sizeof(statp->nsaddr_list[nserv])) 692 memcpy(&statp->nsaddr_list[nserv], 693 &set->sin, size); 694 else 695 statp->nsaddr_list[nserv].sin_family = 0; 696 nserv++; 697 break; 698 699 #ifdef HAS_INET6_STRUCTS 700 case AF_INET6: 701 size = sizeof(set->sin6); 702 if (statp->_u._ext.ext) 703 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 704 &set->sin6, size); 705 if (size <= sizeof(statp->nsaddr_list[nserv])) 706 memcpy(&statp->nsaddr_list[nserv], 707 &set->sin6, size); 708 else 709 statp->nsaddr_list[nserv].sin_family = 0; 710 nserv++; 711 break; 712 #endif 713 714 default: 715 break; 716 } 717 set++; 718 } 719 statp->nscount = nserv; 720 721 } 722 723 int 724 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) 725 { 726 int i; 727 size_t size; 728 uint16_t family; 729 730 for (i = 0; i < statp->nscount && i < cnt; i++) { 731 if (statp->_u._ext.ext) 732 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 733 else 734 family = statp->nsaddr_list[i].sin_family; 735 736 switch (family) { 737 case AF_INET: 738 size = sizeof(set->sin); 739 if (statp->_u._ext.ext) 740 memcpy(&set->sin, 741 &statp->_u._ext.ext->nsaddrs[i], 742 size); 743 else 744 memcpy(&set->sin, &statp->nsaddr_list[i], 745 size); 746 break; 747 748 #ifdef HAS_INET6_STRUCTS 749 case AF_INET6: 750 size = sizeof(set->sin6); 751 if (statp->_u._ext.ext) 752 memcpy(&set->sin6, 753 &statp->_u._ext.ext->nsaddrs[i], 754 size); 755 else 756 memcpy(&set->sin6, &statp->nsaddr_list[i], 757 size); 758 break; 759 #endif 760 761 default: 762 set->sin.sin_family = 0; 763 break; 764 } 765 set++; 766 } 767 return (statp->nscount); 768 } 769 770 #ifdef ANDROID_CHANGES 771 void res_setnetcontext(res_state statp, const struct android_net_context *netcontext) 772 { 773 if (statp != NULL) { 774 statp->netid = netcontext->dns_netid; 775 statp->_mark = netcontext->dns_mark; 776 statp->qhook = netcontext->qhook; 777 if (netcontext->flags & NET_CONTEXT_FLAG_USE_EDNS) { 778 statp->options |= RES_USE_EDNS0 | RES_USE_DNSSEC; 779 } 780 } 781 } 782 783 #endif /* ANDROID_CHANGES */ 784
