res_init.c revision 1781ed7774671d5a750839650b9582ff0abbcf42
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 76static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 77static 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#include <sys/system_properties.h> 105#endif /* ANDROID_CHANGES */ 106 107#ifndef MIN 108#define MIN(x,y) ((x)<(y)?(x):(y)) 109#endif 110 111/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 112#ifdef ANDROID_CHANGES 113#include "resolv_netid.h" 114#include "resolv_private.h" 115#else 116#include <resolv.h> 117#endif 118 119#include "res_private.h" 120 121/* Options. Should all be left alone. */ 122#ifndef DEBUG 123#define DEBUG 124#endif 125 126static void res_setoptions __P((res_state, const char *, const char *)); 127 128static const char sort_mask[] = "/&"; 129#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 130static u_int32_t net_mask __P((struct in_addr)); 131 132#if !defined(isascii) /* XXX - could be a function */ 133# define isascii(c) (!(c & 0200)) 134#endif 135 136/* 137 * Resolver state default settings. 138 */ 139 140/* 141 * Set up default settings. If the configuration file exist, the values 142 * there will have precedence. Otherwise, the server address is set to 143 * INADDR_ANY and the default domain name comes from the gethostname(). 144 * 145 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 146 * rather than INADDR_ANY ("0.0.0.0") as the default name server address 147 * since it was noted that INADDR_ANY actually meant ``the first interface 148 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 149 * it had to be "up" in order for you to reach your own name server. It 150 * was later decided that since the recommended practice is to always 151 * install local static routes through 127.0.0.1 for all your network 152 * interfaces, that we could solve this problem without a code change. 153 * 154 * The configuration file should always be used, since it is the only way 155 * to specify a default domain. If you are running a server on your local 156 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 157 * in the configuration file. 158 * 159 * Return 0 if completes successfully, -1 on error 160 */ 161int 162res_ninit(res_state statp) { 163 extern int __res_vinit(res_state, int); 164 165 return (__res_vinit(statp, 0)); 166} 167 168/* This function has to be reachable by res_data.c but not publicly. */ 169int 170__res_vinit(res_state statp, int preinit) { 171 register FILE *fp; 172 register char *cp, **pp; 173 register int n; 174 char buf[BUFSIZ]; 175 int nserv = 0; /* number of nameserver records read from file */ 176 int haveenv = 0; 177 int havesearch = 0; 178 int nsort = 0; 179 char *net; 180 int dots; 181 union res_sockaddr_union u[2]; 182 183 if ((statp->options & RES_INIT) != 0U) 184 res_ndestroy(statp); 185 186 if (!preinit) { 187 statp->netid = NETID_UNSET; 188 statp->retrans = RES_TIMEOUT; 189 statp->retry = RES_DFLRETRY; 190 statp->options = RES_DEFAULT; 191 statp->id = res_randomid(); 192 statp->_mark = MARK_UNSET; 193 } 194 195 memset(u, 0, sizeof(u)); 196#ifdef USELOOPBACK 197 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 198#else 199 u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 200#endif 201 u[nserv].sin.sin_family = AF_INET; 202 u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 203#ifdef HAVE_SA_LEN 204 u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 205#endif 206 nserv++; 207#ifdef HAS_INET6_STRUCTS 208#ifdef USELOOPBACK 209 u[nserv].sin6.sin6_addr = in6addr_loopback; 210#else 211 u[nserv].sin6.sin6_addr = in6addr_any; 212#endif 213 u[nserv].sin6.sin6_family = AF_INET6; 214 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 215#ifdef HAVE_SA_LEN 216 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 217#endif 218 nserv++; 219#endif 220 statp->nscount = 0; 221 statp->ndots = 1; 222 statp->pfcode = 0; 223 statp->_vcsock = -1; 224 statp->_flags = 0; 225 statp->qhook = NULL; 226 statp->rhook = NULL; 227 statp->_u._ext.nscount = 0; 228 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 229 if (statp->_u._ext.ext != NULL) { 230 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 231 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 232 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 233 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 234 } 235 statp->nsort = 0; 236 res_setservers(statp, u, nserv); 237 238#if 0 /* IGNORE THE ENVIRONMENT */ 239 /* Allow user to override the local domain definition */ 240 if ((cp = getenv("LOCALDOMAIN")) != NULL) { 241 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 242 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 243 haveenv++; 244 245 /* 246 * Set search list to be blank-separated strings 247 * from rest of env value. Permits users of LOCALDOMAIN 248 * to still have a search list, and anyone to set the 249 * one that they want to use as an individual (even more 250 * important now that the rfc1535 stuff restricts searches) 251 */ 252 cp = statp->defdname; 253 pp = statp->dnsrch; 254 *pp++ = cp; 255 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 256 if (*cp == '\n') /* silly backwards compat */ 257 break; 258 else if (*cp == ' ' || *cp == '\t') { 259 *cp = 0; 260 n = 1; 261 } else if (n) { 262 *pp++ = cp; 263 n = 0; 264 havesearch = 1; 265 } 266 } 267 /* null terminate last domain if there are excess */ 268 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 269 cp++; 270 *cp = '\0'; 271 *pp++ = 0; 272 } 273 if (nserv > 0) 274 statp->nscount = nserv; 275#endif 276 277#ifndef ANDROID_CHANGES /* !ANDROID_CHANGES - IGNORE resolv.conf in Android */ 278#define MATCH(line, name) \ 279 (!strncmp(line, name, sizeof(name) - 1) && \ 280 (line[sizeof(name) - 1] == ' ' || \ 281 line[sizeof(name) - 1] == '\t')) 282 283 nserv = 0; 284 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { 285 /* read the config file */ 286 while (fgets(buf, sizeof(buf), fp) != NULL) { 287 /* skip comments */ 288 if (*buf == ';' || *buf == '#') 289 continue; 290 /* read default domain name */ 291 if (MATCH(buf, "domain")) { 292 if (haveenv) /* skip if have from environ */ 293 continue; 294 cp = buf + sizeof("domain") - 1; 295 while (*cp == ' ' || *cp == '\t') 296 cp++; 297 if ((*cp == '\0') || (*cp == '\n')) 298 continue; 299 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 300 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 301 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 302 *cp = '\0'; 303 havesearch = 0; 304 continue; 305 } 306 /* set search list */ 307 if (MATCH(buf, "search")) { 308 if (haveenv) /* skip if have from environ */ 309 continue; 310 cp = buf + sizeof("search") - 1; 311 while (*cp == ' ' || *cp == '\t') 312 cp++; 313 if ((*cp == '\0') || (*cp == '\n')) 314 continue; 315 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 316 statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 317 if ((cp = strchr(statp->defdname, '\n')) != NULL) 318 *cp = '\0'; 319 /* 320 * Set search list to be blank-separated strings 321 * on rest of line. 322 */ 323 cp = statp->defdname; 324 pp = statp->dnsrch; 325 *pp++ = cp; 326 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 327 if (*cp == ' ' || *cp == '\t') { 328 *cp = 0; 329 n = 1; 330 } else if (n) { 331 *pp++ = cp; 332 n = 0; 333 } 334 } 335 /* null terminate last domain if there are excess */ 336 while (*cp != '\0' && *cp != ' ' && *cp != '\t') 337 cp++; 338 *cp = '\0'; 339 *pp++ = 0; 340 havesearch = 1; 341 continue; 342 } 343 /* read nameservers to query */ 344 if (MATCH(buf, "nameserver") && nserv < MAXNS) { 345 struct addrinfo hints, *ai; 346 char sbuf[NI_MAXSERV]; 347 const size_t minsiz = 348 sizeof(statp->_u._ext.ext->nsaddrs[0]); 349 350 cp = buf + sizeof("nameserver") - 1; 351 while (*cp == ' ' || *cp == '\t') 352 cp++; 353 cp[strcspn(cp, ";# \t\n")] = '\0'; 354 if ((*cp != '\0') && (*cp != '\n')) { 355 memset(&hints, 0, sizeof(hints)); 356 hints.ai_family = PF_UNSPEC; 357 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 358 hints.ai_flags = AI_NUMERICHOST; 359 sprintf(sbuf, "%u", NAMESERVER_PORT); 360 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 361 ai->ai_addrlen <= minsiz) { 362 if (statp->_u._ext.ext != NULL) { 363 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 364 ai->ai_addr, ai->ai_addrlen); 365 } 366 if (ai->ai_addrlen <= 367 sizeof(statp->nsaddr_list[nserv])) { 368 memcpy(&statp->nsaddr_list[nserv], 369 ai->ai_addr, ai->ai_addrlen); 370 } else 371 statp->nsaddr_list[nserv].sin_family = 0; 372 freeaddrinfo(ai); 373 nserv++; 374 } 375 } 376 continue; 377 } 378 if (MATCH(buf, "sortlist")) { 379 struct in_addr a; 380 381 cp = buf + sizeof("sortlist") - 1; 382 while (nsort < MAXRESOLVSORT) { 383 while (*cp == ' ' || *cp == '\t') 384 cp++; 385 if (*cp == '\0' || *cp == '\n' || *cp == ';') 386 break; 387 net = cp; 388 while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 389 isascii(*cp) && !isspace((unsigned char)*cp)) 390 cp++; 391 n = *cp; 392 *cp = 0; 393 if (inet_aton(net, &a)) { 394 statp->sort_list[nsort].addr = a; 395 if (ISSORTMASK(n)) { 396 *cp++ = n; 397 net = cp; 398 while (*cp && *cp != ';' && 399 isascii(*cp) && 400 !isspace((unsigned char)*cp)) 401 cp++; 402 n = *cp; 403 *cp = 0; 404 if (inet_aton(net, &a)) { 405 statp->sort_list[nsort].mask = a.s_addr; 406 } else { 407 statp->sort_list[nsort].mask = 408 net_mask(statp->sort_list[nsort].addr); 409 } 410 } else { 411 statp->sort_list[nsort].mask = 412 net_mask(statp->sort_list[nsort].addr); 413 } 414 nsort++; 415 } 416 *cp = n; 417 } 418 continue; 419 } 420 if (MATCH(buf, "options")) { 421 res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 422 continue; 423 } 424 } 425 if (nserv > 0) 426 statp->nscount = nserv; 427 statp->nsort = nsort; 428 (void) fclose(fp); 429 } 430#endif /* !ANDROID_CHANGES */ 431/* 432 * Last chance to get a nameserver. This should not normally 433 * be necessary 434 */ 435#ifdef NO_RESOLV_CONF 436 if(nserv == 0) 437 nserv = get_nameservers(statp); 438#endif 439 440 if (statp->defdname[0] == 0 && 441 gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 442 (cp = strchr(buf, '.')) != NULL) 443 strcpy(statp->defdname, cp + 1); 444 445 /* find components of local domain that might be searched */ 446 if (havesearch == 0) { 447 pp = statp->dnsrch; 448 *pp++ = statp->defdname; 449 *pp = NULL; 450 451 dots = 0; 452 for (cp = statp->defdname; *cp; cp++) 453 dots += (*cp == '.'); 454 455 cp = statp->defdname; 456 while (pp < statp->dnsrch + MAXDFLSRCH) { 457 if (dots < LOCALDOMAINPARTS) 458 break; 459 cp = strchr(cp, '.') + 1; /* we know there is one */ 460 *pp++ = cp; 461 dots--; 462 } 463 *pp = NULL; 464#ifdef DEBUG 465 if (statp->options & RES_DEBUG) { 466 printf(";; res_init()... default dnsrch list:\n"); 467 for (pp = statp->dnsrch; *pp; pp++) 468 printf(";;\t%s\n", *pp); 469 printf(";;\t..END..\n"); 470 } 471#endif 472 } 473 474 if ((cp = getenv("RES_OPTIONS")) != NULL) 475 res_setoptions(statp, cp, "env"); 476 if (nserv > 0) { 477 statp->nscount = nserv; 478 statp->options |= RES_INIT; 479 } 480 return (0); 481} 482 483static void 484res_setoptions(res_state statp, const char *options, const char *source) 485{ 486 const char *cp = options; 487 int i; 488 struct __res_state_ext *ext = statp->_u._ext.ext; 489 490#ifdef DEBUG 491 if (statp->options & RES_DEBUG) 492 printf(";; res_setoptions(\"%s\", \"%s\")...\n", 493 options, source); 494#endif 495 while (*cp) { 496 /* skip leading and inner runs of spaces */ 497 while (*cp == ' ' || *cp == '\t') 498 cp++; 499 /* search for and process individual options */ 500 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 501 i = atoi(cp + sizeof("ndots:") - 1); 502 if (i <= RES_MAXNDOTS) 503 statp->ndots = i; 504 else 505 statp->ndots = RES_MAXNDOTS; 506#ifdef DEBUG 507 if (statp->options & RES_DEBUG) 508 printf(";;\tndots=%d\n", statp->ndots); 509#endif 510 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 511 i = atoi(cp + sizeof("timeout:") - 1); 512 if (i <= RES_MAXRETRANS) 513 statp->retrans = i; 514 else 515 statp->retrans = RES_MAXRETRANS; 516#ifdef DEBUG 517 if (statp->options & RES_DEBUG) 518 printf(";;\ttimeout=%d\n", statp->retrans); 519#endif 520 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 521 i = atoi(cp + sizeof("attempts:") - 1); 522 if (i <= RES_MAXRETRY) 523 statp->retry = i; 524 else 525 statp->retry = RES_MAXRETRY; 526#ifdef DEBUG 527 if (statp->options & RES_DEBUG) 528 printf(";;\tattempts=%d\n", statp->retry); 529#endif 530 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 531#ifdef DEBUG 532 if (!(statp->options & RES_DEBUG)) { 533 printf(";; res_setoptions(\"%s\", \"%s\")..\n", 534 options, source); 535 statp->options |= RES_DEBUG; 536 } 537 printf(";;\tdebug\n"); 538#endif 539 } else if (!strncmp(cp, "no_tld_query", 540 sizeof("no_tld_query") - 1) || 541 !strncmp(cp, "no-tld-query", 542 sizeof("no-tld-query") - 1)) { 543 statp->options |= RES_NOTLDQUERY; 544 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 545 statp->options |= RES_USE_INET6; 546 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 547 statp->options |= RES_ROTATE; 548 } else if (!strncmp(cp, "no-check-names", 549 sizeof("no-check-names") - 1)) { 550 statp->options |= RES_NOCHECKNAME; 551 } 552#ifdef RES_USE_EDNS0 553 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 554 statp->options |= RES_USE_EDNS0; 555 } 556#endif 557 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 558 statp->options |= RES_USE_DNAME; 559 } 560 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 561 if (ext == NULL) 562 goto skip; 563 cp += sizeof("nibble:") - 1; 564 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 565 strncpy(ext->nsuffix, cp, (size_t)i); 566 ext->nsuffix[i] = '\0'; 567 } 568 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 569 if (ext == NULL) 570 goto skip; 571 cp += sizeof("nibble2:") - 1; 572 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 573 strncpy(ext->nsuffix2, cp, (size_t)i); 574 ext->nsuffix2[i] = '\0'; 575 } 576 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 577 cp += sizeof("v6revmode:") - 1; 578 /* "nibble" and "bitstring" used to be valid */ 579 if (!strncmp(cp, "single", sizeof("single") - 1)) { 580 statp->options |= RES_NO_NIBBLE2; 581 } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 582 statp->options &= 583 ~RES_NO_NIBBLE2; 584 } 585 } 586 else { 587 /* XXX - print a warning here? */ 588 } 589 skip: 590 /* skip to next run of spaces */ 591 while (*cp && *cp != ' ' && *cp != '\t') 592 cp++; 593 } 594} 595 596/* XXX - should really support CIDR which means explicit masks always. */ 597static u_int32_t 598net_mask(in) /* XXX - should really use system's version of this */ 599 struct in_addr in; 600{ 601 register u_int32_t i = ntohl(in.s_addr); 602 603 if (IN_CLASSA(i)) 604 return (htonl(IN_CLASSA_NET)); 605 else if (IN_CLASSB(i)) 606 return (htonl(IN_CLASSB_NET)); 607 return (htonl(IN_CLASSC_NET)); 608} 609 610#ifdef ANDROID_CHANGES 611static int 612real_randomid(u_int *random_value) { 613 /* open the nonblocking random device, returning -1 on failure */ 614 int random_device = open("/dev/urandom", O_RDONLY | O_CLOEXEC); 615 if (random_device < 0) { 616 return -1; 617 } 618 619 /* read from the random device, returning -1 on failure (or too many retries)*/ 620 u_int retry = 5; 621 for (retry; retry > 0; retry--) { 622 int retval = read(random_device, random_value, sizeof(u_int)); 623 if (retval == sizeof(u_int)) { 624 *random_value &= 0xffff; 625 close(random_device); 626 return 0; 627 } else if ((retval < 0) && (errno != EINTR)) { 628 break; 629 } 630 } 631 632 close(random_device); 633 return -1; 634} 635#endif /* ANDROID_CHANGES */ 636 637u_int 638res_randomid(void) { 639#ifdef ANDROID_CHANGES 640 int status = 0; 641 u_int output = 0; 642 status = real_randomid(&output); 643 if (status != -1) { 644 return output; 645 } 646#endif /* ANDROID_CHANGES */ 647 struct timeval now; 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 */ 659void 660res_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 676void 677res_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 685const char * 686res_get_nibblesuffix(res_state statp) { 687 if (statp->_u._ext.ext) 688 return (statp->_u._ext.ext->nsuffix); 689 return ("ip6.arpa"); 690} 691 692const char * 693res_get_nibblesuffix2(res_state statp) { 694 if (statp->_u._ext.ext) 695 return (statp->_u._ext.ext->nsuffix2); 696 return ("ip6.int"); 697} 698 699void 700res_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#ifdef notdef 722 else 723 statp->nsaddr_list[nserv].sin_family = 0; 724#endif 725 nserv++; 726 break; 727 728#ifdef HAS_INET6_STRUCTS 729 case AF_INET6: 730 size = sizeof(set->sin6); 731 if (statp->_u._ext.ext) 732 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 733 &set->sin6, size); 734 if (size <= sizeof(statp->nsaddr_list[nserv])) 735 memcpy(&statp->nsaddr_list[nserv], 736 &set->sin6, size); 737 else 738 statp->nsaddr_list[nserv].sin_family = 0; 739 nserv++; 740 break; 741#endif 742 743 default: 744 break; 745 } 746 set++; 747 } 748 statp->nscount = nserv; 749 750} 751 752int 753res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 754 int i; 755 size_t size; 756 u_int16_t family; 757 758 for (i = 0; i < statp->nscount && i < cnt; i++) { 759 if (statp->_u._ext.ext) 760 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 761 else 762 family = statp->nsaddr_list[i].sin_family; 763 764 switch (family) { 765 case AF_INET: 766 size = sizeof(set->sin); 767 if (statp->_u._ext.ext) 768 memcpy(&set->sin, 769 &statp->_u._ext.ext->nsaddrs[i], 770 size); 771 else 772 memcpy(&set->sin, &statp->nsaddr_list[i], 773 size); 774 break; 775 776#ifdef HAS_INET6_STRUCTS 777 case AF_INET6: 778 size = sizeof(set->sin6); 779 if (statp->_u._ext.ext) 780 memcpy(&set->sin6, 781 &statp->_u._ext.ext->nsaddrs[i], 782 size); 783 else 784 memcpy(&set->sin6, &statp->nsaddr_list[i], 785 size); 786 break; 787#endif 788 789 default: 790 set->sin.sin_family = 0; 791 break; 792 } 793 set++; 794 } 795 return (statp->nscount); 796} 797 798#ifdef ANDROID_CHANGES 799void res_setnetid(res_state statp, unsigned netid) 800{ 801 if (statp != NULL) { 802 statp->netid = netid; 803 } 804} 805 806void res_setmark(res_state statp, unsigned mark) 807{ 808 if (statp != NULL) { 809 statp->_mark = mark; 810 } 811} 812 813#endif /* ANDROID_CHANGES */ 814