res_init.c revision 292216
1156952Sume/* 2156952Sume * Copyright (c) 1985, 1989, 1993 3156952Sume * The Regents of the University of California. All rights reserved. 4156952Sume * 5156952Sume * Redistribution and use in source and binary forms, with or without 6156952Sume * modification, are permitted provided that the following conditions 7156952Sume * are met: 8156952Sume * 1. Redistributions of source code must retain the above copyright 9156952Sume * notice, this list of conditions and the following disclaimer. 10156952Sume * 2. Redistributions in binary form must reproduce the above copyright 11156952Sume * notice, this list of conditions and the following disclaimer in the 12156952Sume * documentation and/or other materials provided with the distribution. 13156952Sume * 4. Neither the name of the University nor the names of its contributors 14156952Sume * may be used to endorse or promote products derived from this software 15156952Sume * without specific prior written permission. 16156952Sume * 17156952Sume * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18156952Sume * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19156952Sume * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20156952Sume * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21156952Sume * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22156952Sume * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23156952Sume * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24156952Sume * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25156952Sume * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26156952Sume * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27156952Sume * SUCH DAMAGE. 28156952Sume */ 29156952Sume 30156952Sume/* 31156952Sume * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32156952Sume * 33156952Sume * Permission to use, copy, modify, and distribute this software for any 34156952Sume * purpose with or without fee is hereby granted, provided that the above 35156952Sume * copyright notice and this permission notice appear in all copies, and that 36156952Sume * the name of Digital Equipment Corporation not be used in advertising or 37156952Sume * publicity pertaining to distribution of the document or software without 38156952Sume * specific, written prior permission. 39156952Sume * 40156952Sume * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41156952Sume * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42156952Sume * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43156952Sume * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44156952Sume * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45156952Sume * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46156952Sume * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47156952Sume * SOFTWARE. 48156952Sume */ 49156952Sume 50156952Sume/* 51156952Sume * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 52156952Sume * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 53156952Sume * 54156952Sume * Permission to use, copy, modify, and distribute this software for any 55156952Sume * purpose with or without fee is hereby granted, provided that the above 56156952Sume * copyright notice and this permission notice appear in all copies. 57156952Sume * 58156952Sume * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 59156952Sume * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 60156952Sume * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 61156952Sume * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 62156952Sume * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 63156952Sume * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 64156952Sume * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 65156952Sume */ 66156952Sume 67156952Sume#if defined(LIBC_SCCS) && !defined(lint) 68156952Sumestatic const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; 69269867Sumestatic const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $"; 70156952Sume#endif /* LIBC_SCCS and not lint */ 71156956Sume#include <sys/cdefs.h> 72156956Sume__FBSDID("$FreeBSD: head/lib/libc/resolv/res_init.c 292216 2015-12-14 17:21:06Z vangyzen $"); 73156952Sume 74156952Sume#include "port_before.h" 75156952Sume 76160965Sume#include "namespace.h" 77160965Sume 78156952Sume#include <sys/types.h> 79156952Sume#include <sys/param.h> 80156952Sume#include <sys/socket.h> 81289315Svangyzen#include <sys/stat.h> 82156952Sume#include <sys/time.h> 83156952Sume 84156952Sume#include <netinet/in.h> 85156952Sume#include <arpa/inet.h> 86156952Sume#include <arpa/nameser.h> 87156952Sume 88156952Sume#include <ctype.h> 89156952Sume#include <stdio.h> 90156952Sume#include <stdlib.h> 91156952Sume#include <string.h> 92156952Sume#include <unistd.h> 93156952Sume#include <netdb.h> 94156952Sume 95269867Sume#ifndef HAVE_MD5 96269867Sume# include "../dst/md5.h" 97269867Sume#else 98269867Sume# ifdef SOLARIS2 99269867Sume# include <sys/md5.h> 100269867Sume# elif _LIBC 101269867Sume# include <md5.h> 102269867Sume# endif 103269867Sume#endif 104269867Sume#ifndef _MD5_H_ 105269867Sume# define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 106269867Sume#endif 107269867Sume 108160965Sume#include "un-namespace.h" 109160965Sume 110156952Sume#include "port_after.h" 111156952Sume 112156952Sume/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 113156952Sume#include <resolv.h> 114156952Sume 115156952Sume#include "res_private.h" 116156952Sume 117170244Sume/*% Options. Should all be left alone. */ 118156952Sume#define RESOLVSORT 119156952Sume#define DEBUG 120156952Sume 121156952Sume#ifdef SOLARIS2 122156952Sume#include <sys/systeminfo.h> 123156952Sume#endif 124156952Sume 125156956Sumestatic void res_setoptions(res_state, const char *, const char *); 126156952Sume 127156952Sume#ifdef RESOLVSORT 128156952Sumestatic const char sort_mask[] = "/&"; 129156952Sume#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 130156956Sumestatic u_int32_t net_mask(struct in_addr); 131156952Sume#endif 132156952Sume 133170244Sume#if !defined(isascii) /*%< XXX - could be a function */ 134156952Sume# define isascii(c) (!(c & 0200)) 135156952Sume#endif 136156952Sume 137156952Sume/* 138156952Sume * Resolver state default settings. 139156952Sume */ 140156952Sume 141170244Sume/*% 142156952Sume * Set up default settings. If the configuration file exist, the values 143156952Sume * there will have precedence. Otherwise, the server address is set to 144156952Sume * INADDR_ANY and the default domain name comes from the gethostname(). 145156952Sume * 146156952Sume * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 147156952Sume * rather than INADDR_ANY ("0.0.0.0") as the default name server address 148156952Sume * since it was noted that INADDR_ANY actually meant ``the first interface 149156952Sume * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 150156952Sume * it had to be "up" in order for you to reach your own name server. It 151156952Sume * was later decided that since the recommended practice is to always 152156952Sume * install local static routes through 127.0.0.1 for all your network 153156952Sume * interfaces, that we could solve this problem without a code change. 154156952Sume * 155156952Sume * The configuration file should always be used, since it is the only way 156156952Sume * to specify a default domain. If you are running a server on your local 157156952Sume * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 158156952Sume * in the configuration file. 159156952Sume * 160156952Sume * Return 0 if completes successfully, -1 on error 161156952Sume */ 162156952Sumeint 163156952Sumeres_ninit(res_state statp) { 164156952Sume extern int __res_vinit(res_state, int); 165156952Sume 166156952Sume return (__res_vinit(statp, 0)); 167156952Sume} 168156952Sume 169170244Sume/*% This function has to be reachable by res_data.c but not publically. */ 170156952Sumeint 171156952Sume__res_vinit(res_state statp, int preinit) { 172156956Sume FILE *fp; 173156956Sume char *cp, **pp; 174156956Sume int n; 175156952Sume char buf[BUFSIZ]; 176170244Sume int nserv = 0; /*%< number of nameserver records read from file */ 177156952Sume int haveenv = 0; 178156952Sume int havesearch = 0; 179156952Sume#ifdef RESOLVSORT 180156952Sume int nsort = 0; 181156952Sume char *net; 182156952Sume#endif 183156952Sume int dots; 184156952Sume union res_sockaddr_union u[2]; 185174226Sume int maxns = MAXNS; 186156952Sume 187174226Sume RES_SET_H_ERRNO(statp, 0); 188156952Sume if (statp->_u._ext.ext != NULL) 189156952Sume res_ndestroy(statp); 190156952Sume 191156952Sume if (!preinit) { 192156952Sume statp->retrans = RES_TIMEOUT; 193156952Sume statp->retry = RES_DFLRETRY; 194156952Sume statp->options = RES_DEFAULT; 195156952Sume } 196156952Sume 197269867Sume statp->_rnd = malloc(16); 198269867Sume res_rndinit(statp); 199269867Sume statp->id = res_nrandomid(statp); 200269867Sume 201156952Sume memset(u, 0, sizeof(u)); 202156952Sume#ifdef USELOOPBACK 203156952Sume u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 204156952Sume#else 205156952Sume u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 206156952Sume#endif 207156952Sume u[nserv].sin.sin_family = AF_INET; 208156952Sume u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 209156952Sume#ifdef HAVE_SA_LEN 210156952Sume u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 211156952Sume#endif 212156952Sume nserv++; 213156952Sume#ifdef HAS_INET6_STRUCTS 214156952Sume#ifdef USELOOPBACK 215156952Sume u[nserv].sin6.sin6_addr = in6addr_loopback; 216156952Sume#else 217156952Sume u[nserv].sin6.sin6_addr = in6addr_any; 218156952Sume#endif 219156952Sume u[nserv].sin6.sin6_family = AF_INET6; 220156952Sume u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 221156952Sume#ifdef HAVE_SA_LEN 222156952Sume u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 223156952Sume#endif 224156952Sume nserv++; 225156952Sume#endif 226156952Sume statp->nscount = 0; 227156952Sume statp->ndots = 1; 228156952Sume statp->pfcode = 0; 229156952Sume statp->_vcsock = -1; 230156952Sume statp->_flags = 0; 231156952Sume statp->qhook = NULL; 232156952Sume statp->rhook = NULL; 233156952Sume statp->_u._ext.nscount = 0; 234156952Sume statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 235156952Sume if (statp->_u._ext.ext != NULL) { 236156952Sume memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 237156952Sume statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 238156952Sume strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 239156952Sume strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 240292216Svangyzen statp->_u._ext.ext->reload_period = 2; 241174226Sume } else { 242174226Sume /* 243174226Sume * Historically res_init() rarely, if at all, failed. 244174226Sume * Examples and applications exist which do not check 245174226Sume * our return code. Furthermore several applications 246174226Sume * simply call us to get the systems domainname. So 247174226Sume * rather then immediately fail here we store the 248174226Sume * failure, which is returned later, in h_errno. And 249174226Sume * prevent the collection of 'nameserver' information 250174226Sume * by setting maxns to 0. Thus applications that fail 251174226Sume * to check our return code wont be able to make 252174226Sume * queries anyhow. 253174226Sume */ 254174226Sume RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 255174226Sume maxns = 0; 256174226Sume } 257156952Sume#ifdef RESOLVSORT 258156952Sume statp->nsort = 0; 259156952Sume#endif 260156952Sume res_setservers(statp, u, nserv); 261156952Sume 262156952Sume#ifdef SOLARIS2 263156952Sume /* 264156952Sume * The old libresolv derived the defaultdomain from NIS/NIS+. 265156952Sume * We want to keep this behaviour 266156952Sume */ 267156952Sume { 268156952Sume char buf[sizeof(statp->defdname)], *cp; 269156952Sume int ret; 270156952Sume 271156952Sume if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 272156952Sume (unsigned int)ret <= sizeof(buf)) { 273156952Sume if (buf[0] == '+') 274156952Sume buf[0] = '.'; 275156952Sume cp = strchr(buf, '.'); 276165258Sume cp = (cp == NULL) ? buf : (cp + 1); 277174226Sume strncpy(statp->defdname, cp, 278174226Sume sizeof(statp->defdname) - 1); 279174226Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 280156952Sume } 281156952Sume } 282156952Sume#endif /* SOLARIS2 */ 283156952Sume 284156952Sume /* Allow user to override the local domain definition */ 285156956Sume if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 286156952Sume (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 287156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 288156952Sume haveenv++; 289156952Sume 290156952Sume /* 291156952Sume * Set search list to be blank-separated strings 292156952Sume * from rest of env value. Permits users of LOCALDOMAIN 293156952Sume * to still have a search list, and anyone to set the 294156952Sume * one that they want to use as an individual (even more 295156952Sume * important now that the rfc1535 stuff restricts searches) 296156952Sume */ 297156952Sume cp = statp->defdname; 298156952Sume pp = statp->dnsrch; 299156952Sume *pp++ = cp; 300156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 301170244Sume if (*cp == '\n') /*%< silly backwards compat */ 302156952Sume break; 303156952Sume else if (*cp == ' ' || *cp == '\t') { 304156952Sume *cp = 0; 305156952Sume n = 1; 306156952Sume } else if (n) { 307156952Sume *pp++ = cp; 308156952Sume n = 0; 309156952Sume havesearch = 1; 310156952Sume } 311156952Sume } 312156952Sume /* null terminate last domain if there are excess */ 313156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 314156952Sume cp++; 315156952Sume *cp = '\0'; 316156952Sume *pp++ = 0; 317156952Sume } 318156952Sume 319156952Sume#define MATCH(line, name) \ 320156952Sume (!strncmp(line, name, sizeof(name) - 1) && \ 321156952Sume (line[sizeof(name) - 1] == ' ' || \ 322156952Sume line[sizeof(name) - 1] == '\t')) 323156952Sume 324156952Sume nserv = 0; 325254700Sjilles if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 326289315Svangyzen struct stat sb; 327289315Svangyzen struct timespec now; 328289315Svangyzen 329292216Svangyzen if (statp->_u._ext.ext != NULL) { 330292216Svangyzen if (_fstat(fileno(fp), &sb) == 0) { 331292216Svangyzen statp->_u._ext.ext->conf_mtim = sb.st_mtim; 332292216Svangyzen if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 333292216Svangyzen statp->_u._ext.ext->conf_stat = now.tv_sec; 334292216Svangyzen } 335289315Svangyzen } 336289315Svangyzen } 337289315Svangyzen 338156952Sume /* read the config file */ 339156952Sume while (fgets(buf, sizeof(buf), fp) != NULL) { 340156952Sume /* skip comments */ 341156952Sume if (*buf == ';' || *buf == '#') 342156952Sume continue; 343156952Sume /* read default domain name */ 344156952Sume if (MATCH(buf, "domain")) { 345170244Sume if (haveenv) /*%< skip if have from environ */ 346156952Sume continue; 347156952Sume cp = buf + sizeof("domain") - 1; 348156952Sume while (*cp == ' ' || *cp == '\t') 349156952Sume cp++; 350156952Sume if ((*cp == '\0') || (*cp == '\n')) 351156952Sume continue; 352156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 353156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 354156952Sume if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 355156952Sume *cp = '\0'; 356156952Sume havesearch = 0; 357156952Sume continue; 358156952Sume } 359156952Sume /* set search list */ 360156952Sume if (MATCH(buf, "search")) { 361170244Sume if (haveenv) /*%< skip if have from environ */ 362156952Sume continue; 363156952Sume cp = buf + sizeof("search") - 1; 364156952Sume while (*cp == ' ' || *cp == '\t') 365156952Sume cp++; 366156952Sume if ((*cp == '\0') || (*cp == '\n')) 367156952Sume continue; 368156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 369156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 370156952Sume if ((cp = strchr(statp->defdname, '\n')) != NULL) 371156952Sume *cp = '\0'; 372156952Sume /* 373156952Sume * Set search list to be blank-separated strings 374156952Sume * on rest of line. 375156952Sume */ 376156952Sume cp = statp->defdname; 377156952Sume pp = statp->dnsrch; 378156952Sume *pp++ = cp; 379156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 380156952Sume if (*cp == ' ' || *cp == '\t') { 381156952Sume *cp = 0; 382156952Sume n = 1; 383156952Sume } else if (n) { 384156952Sume *pp++ = cp; 385156952Sume n = 0; 386156952Sume } 387156952Sume } 388156952Sume /* null terminate last domain if there are excess */ 389156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t') 390156952Sume cp++; 391156952Sume *cp = '\0'; 392156952Sume *pp++ = 0; 393156952Sume havesearch = 1; 394156952Sume continue; 395156952Sume } 396156952Sume /* read nameservers to query */ 397174226Sume if (MATCH(buf, "nameserver") && nserv < maxns) { 398156952Sume struct addrinfo hints, *ai; 399156952Sume char sbuf[NI_MAXSERV]; 400156952Sume const size_t minsiz = 401156952Sume sizeof(statp->_u._ext.ext->nsaddrs[0]); 402156952Sume 403156952Sume cp = buf + sizeof("nameserver") - 1; 404156952Sume while (*cp == ' ' || *cp == '\t') 405156952Sume cp++; 406156952Sume cp[strcspn(cp, ";# \t\n")] = '\0'; 407156952Sume if ((*cp != '\0') && (*cp != '\n')) { 408156952Sume memset(&hints, 0, sizeof(hints)); 409156952Sume hints.ai_family = PF_UNSPEC; 410156952Sume hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 411156952Sume hints.ai_flags = AI_NUMERICHOST; 412156952Sume sprintf(sbuf, "%u", NAMESERVER_PORT); 413156952Sume if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 414156952Sume ai->ai_addrlen <= minsiz) { 415156952Sume if (statp->_u._ext.ext != NULL) { 416156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 417156952Sume ai->ai_addr, ai->ai_addrlen); 418156952Sume } 419156952Sume if (ai->ai_addrlen <= 420156952Sume sizeof(statp->nsaddr_list[nserv])) { 421156952Sume memcpy(&statp->nsaddr_list[nserv], 422156952Sume ai->ai_addr, ai->ai_addrlen); 423156952Sume } else 424156952Sume statp->nsaddr_list[nserv].sin_family = 0; 425156952Sume freeaddrinfo(ai); 426156952Sume nserv++; 427156952Sume } 428156952Sume } 429156952Sume continue; 430156952Sume } 431156952Sume#ifdef RESOLVSORT 432156952Sume if (MATCH(buf, "sortlist")) { 433156952Sume struct in_addr a; 434156956Sume struct in6_addr a6; 435156956Sume int m, i; 436156956Sume u_char *u; 437156956Sume struct __res_state_ext *ext = statp->_u._ext.ext; 438156952Sume 439156952Sume cp = buf + sizeof("sortlist") - 1; 440156952Sume while (nsort < MAXRESOLVSORT) { 441156952Sume while (*cp == ' ' || *cp == '\t') 442156952Sume cp++; 443156952Sume if (*cp == '\0' || *cp == '\n' || *cp == ';') 444156952Sume break; 445156952Sume net = cp; 446156952Sume while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 447156952Sume isascii(*cp) && !isspace((unsigned char)*cp)) 448156952Sume cp++; 449156952Sume n = *cp; 450156952Sume *cp = 0; 451156952Sume if (inet_aton(net, &a)) { 452156952Sume statp->sort_list[nsort].addr = a; 453156952Sume if (ISSORTMASK(n)) { 454156952Sume *cp++ = n; 455156952Sume net = cp; 456156952Sume while (*cp && *cp != ';' && 457156952Sume isascii(*cp) && 458156952Sume !isspace((unsigned char)*cp)) 459156952Sume cp++; 460156952Sume n = *cp; 461156952Sume *cp = 0; 462156952Sume if (inet_aton(net, &a)) { 463156952Sume statp->sort_list[nsort].mask = a.s_addr; 464156952Sume } else { 465156952Sume statp->sort_list[nsort].mask = 466156952Sume net_mask(statp->sort_list[nsort].addr); 467156952Sume } 468156952Sume } else { 469156952Sume statp->sort_list[nsort].mask = 470156952Sume net_mask(statp->sort_list[nsort].addr); 471156952Sume } 472156956Sume ext->sort_list[nsort].af = AF_INET; 473156956Sume ext->sort_list[nsort].addr.ina = 474156956Sume statp->sort_list[nsort].addr; 475156956Sume ext->sort_list[nsort].mask.ina.s_addr = 476156956Sume statp->sort_list[nsort].mask; 477156952Sume nsort++; 478156952Sume } 479156956Sume else if (inet_pton(AF_INET6, net, &a6) == 1) { 480156956Sume 481156956Sume ext->sort_list[nsort].af = AF_INET6; 482156956Sume ext->sort_list[nsort].addr.in6a = a6; 483156956Sume u = (u_char *)&ext->sort_list[nsort].mask.in6a; 484156956Sume *cp++ = n; 485156956Sume net = cp; 486156956Sume while (*cp && *cp != ';' && 487156956Sume isascii(*cp) && !isspace(*cp)) 488156956Sume cp++; 489156956Sume m = n; 490156956Sume n = *cp; 491156956Sume *cp = 0; 492156956Sume switch (m) { 493156956Sume case '/': 494156956Sume m = atoi(net); 495156956Sume break; 496156956Sume case '&': 497156956Sume if (inet_pton(AF_INET6, net, u) == 1) { 498156956Sume m = -1; 499156956Sume break; 500156956Sume } 501156956Sume /*FALLTHROUGH*/ 502156956Sume default: 503156956Sume m = sizeof(struct in6_addr) * CHAR_BIT; 504156956Sume break; 505156956Sume } 506156956Sume if (m >= 0) { 507156956Sume for (i = 0; i < sizeof(struct in6_addr); i++) { 508156956Sume if (m <= 0) { 509156956Sume *u = 0; 510156956Sume } else { 511156956Sume m -= CHAR_BIT; 512156956Sume *u = (u_char)~0; 513156956Sume if (m < 0) 514156956Sume *u <<= -m; 515156956Sume } 516156956Sume u++; 517156956Sume } 518156956Sume } 519156956Sume statp->sort_list[nsort].addr.s_addr = 520156956Sume (u_int32_t)0xffffffff; 521156956Sume statp->sort_list[nsort].mask = 522156956Sume (u_int32_t)0xffffffff; 523156956Sume nsort++; 524156956Sume } 525156952Sume *cp = n; 526156952Sume } 527156952Sume continue; 528156952Sume } 529156952Sume#endif 530156952Sume if (MATCH(buf, "options")) { 531156952Sume res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 532156952Sume continue; 533156952Sume } 534156952Sume } 535156952Sume if (nserv > 0) 536156952Sume statp->nscount = nserv; 537156952Sume#ifdef RESOLVSORT 538156952Sume statp->nsort = nsort; 539156952Sume#endif 540156952Sume (void) fclose(fp); 541156952Sume } 542156952Sume/* 543156952Sume * Last chance to get a nameserver. This should not normally 544156952Sume * be necessary 545156952Sume */ 546156952Sume#ifdef NO_RESOLV_CONF 547156952Sume if(nserv == 0) 548156952Sume nserv = get_nameservers(statp); 549156952Sume#endif 550156952Sume 551156952Sume if (statp->defdname[0] == 0 && 552156952Sume gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 553156952Sume (cp = strchr(buf, '.')) != NULL) 554156952Sume strcpy(statp->defdname, cp + 1); 555156952Sume 556156952Sume /* find components of local domain that might be searched */ 557156952Sume if (havesearch == 0) { 558156952Sume pp = statp->dnsrch; 559156952Sume *pp++ = statp->defdname; 560156952Sume *pp = NULL; 561156952Sume 562156952Sume dots = 0; 563156952Sume for (cp = statp->defdname; *cp; cp++) 564156952Sume dots += (*cp == '.'); 565156952Sume 566156952Sume cp = statp->defdname; 567156952Sume while (pp < statp->dnsrch + MAXDFLSRCH) { 568156952Sume if (dots < LOCALDOMAINPARTS) 569156952Sume break; 570170244Sume cp = strchr(cp, '.') + 1; /*%< we know there is one */ 571156952Sume *pp++ = cp; 572156952Sume dots--; 573156952Sume } 574156952Sume *pp = NULL; 575156952Sume#ifdef DEBUG 576156952Sume if (statp->options & RES_DEBUG) { 577156952Sume printf(";; res_init()... default dnsrch list:\n"); 578156952Sume for (pp = statp->dnsrch; *pp; pp++) 579156952Sume printf(";;\t%s\n", *pp); 580156952Sume printf(";;\t..END..\n"); 581156952Sume } 582156952Sume#endif 583156952Sume } 584156952Sume 585156956Sume if (issetugid()) 586156956Sume statp->options |= RES_NOALIASES; 587156956Sume else if ((cp = getenv("RES_OPTIONS")) != NULL) 588156952Sume res_setoptions(statp, cp, "env"); 589156952Sume statp->options |= RES_INIT; 590174226Sume return (statp->res_h_errno); 591156952Sume} 592156952Sume 593156952Sumestatic void 594156952Sumeres_setoptions(res_state statp, const char *options, const char *source) 595156952Sume{ 596156952Sume const char *cp = options; 597156952Sume int i; 598156952Sume struct __res_state_ext *ext = statp->_u._ext.ext; 599156952Sume 600156952Sume#ifdef DEBUG 601156952Sume if (statp->options & RES_DEBUG) 602156952Sume printf(";; res_setoptions(\"%s\", \"%s\")...\n", 603156952Sume options, source); 604156952Sume#endif 605156952Sume while (*cp) { 606156952Sume /* skip leading and inner runs of spaces */ 607156952Sume while (*cp == ' ' || *cp == '\t') 608156952Sume cp++; 609156952Sume /* search for and process individual options */ 610156952Sume if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 611156952Sume i = atoi(cp + sizeof("ndots:") - 1); 612156952Sume if (i <= RES_MAXNDOTS) 613156952Sume statp->ndots = i; 614156952Sume else 615156952Sume statp->ndots = RES_MAXNDOTS; 616156952Sume#ifdef DEBUG 617156952Sume if (statp->options & RES_DEBUG) 618156952Sume printf(";;\tndots=%d\n", statp->ndots); 619156952Sume#endif 620156952Sume } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 621156952Sume i = atoi(cp + sizeof("timeout:") - 1); 622156952Sume if (i <= RES_MAXRETRANS) 623156952Sume statp->retrans = i; 624156952Sume else 625156952Sume statp->retrans = RES_MAXRETRANS; 626156952Sume#ifdef DEBUG 627156952Sume if (statp->options & RES_DEBUG) 628156952Sume printf(";;\ttimeout=%d\n", statp->retrans); 629156952Sume#endif 630156952Sume#ifdef SOLARIS2 631156952Sume } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 632156952Sume /* 633156952Sume * For backward compatibility, 'retrans' is 634156952Sume * supported as an alias for 'timeout', though 635156952Sume * without an imposed maximum. 636156952Sume */ 637156952Sume statp->retrans = atoi(cp + sizeof("retrans:") - 1); 638156952Sume } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 639156952Sume /* 640156952Sume * For backward compatibility, 'retry' is 641156952Sume * supported as an alias for 'attempts', though 642156952Sume * without an imposed maximum. 643156952Sume */ 644156952Sume statp->retry = atoi(cp + sizeof("retry:") - 1); 645156952Sume#endif /* SOLARIS2 */ 646156952Sume } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 647156952Sume i = atoi(cp + sizeof("attempts:") - 1); 648156952Sume if (i <= RES_MAXRETRY) 649156952Sume statp->retry = i; 650156952Sume else 651156952Sume statp->retry = RES_MAXRETRY; 652156952Sume#ifdef DEBUG 653156952Sume if (statp->options & RES_DEBUG) 654156952Sume printf(";;\tattempts=%d\n", statp->retry); 655156952Sume#endif 656156952Sume } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 657156952Sume#ifdef DEBUG 658156952Sume if (!(statp->options & RES_DEBUG)) { 659156952Sume printf(";; res_setoptions(\"%s\", \"%s\")..\n", 660156952Sume options, source); 661156952Sume statp->options |= RES_DEBUG; 662156952Sume } 663156952Sume printf(";;\tdebug\n"); 664156952Sume#endif 665156952Sume } else if (!strncmp(cp, "no_tld_query", 666156952Sume sizeof("no_tld_query") - 1) || 667156952Sume !strncmp(cp, "no-tld-query", 668156952Sume sizeof("no-tld-query") - 1)) { 669156952Sume statp->options |= RES_NOTLDQUERY; 670156952Sume } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 671156952Sume statp->options |= RES_USE_INET6; 672156956Sume } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 673156956Sume statp->options |= RES_INSECURE1; 674156956Sume } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 675156956Sume statp->options |= RES_INSECURE2; 676156952Sume } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 677156952Sume statp->options |= RES_ROTATE; 678156952Sume } else if (!strncmp(cp, "no-check-names", 679156952Sume sizeof("no-check-names") - 1)) { 680156952Sume statp->options |= RES_NOCHECKNAME; 681289315Svangyzen } else if (!strncmp(cp, "reload-period:", 682289315Svangyzen sizeof("reload-period:") - 1)) { 683292216Svangyzen if (ext != NULL) { 684292216Svangyzen ext->reload_period = (u_short) 685292216Svangyzen atoi(cp + sizeof("reload-period:") - 1); 686292216Svangyzen } 687156952Sume } 688156952Sume#ifdef RES_USE_EDNS0 689156952Sume else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 690156952Sume statp->options |= RES_USE_EDNS0; 691156952Sume } 692156952Sume#endif 693156956Sume#ifndef _LIBC 694156952Sume else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 695156952Sume statp->options |= RES_USE_DNAME; 696156952Sume } 697156952Sume else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 698156952Sume if (ext == NULL) 699156952Sume goto skip; 700156952Sume cp += sizeof("nibble:") - 1; 701156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 702156952Sume strncpy(ext->nsuffix, cp, i); 703156952Sume ext->nsuffix[i] = '\0'; 704156952Sume } 705156952Sume else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 706156952Sume if (ext == NULL) 707156952Sume goto skip; 708156952Sume cp += sizeof("nibble2:") - 1; 709156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 710156952Sume strncpy(ext->nsuffix2, cp, i); 711156952Sume ext->nsuffix2[i] = '\0'; 712156952Sume } 713156952Sume else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 714156952Sume cp += sizeof("v6revmode:") - 1; 715156952Sume /* "nibble" and "bitstring" used to be valid */ 716156952Sume if (!strncmp(cp, "single", sizeof("single") - 1)) { 717156952Sume statp->options |= RES_NO_NIBBLE2; 718156952Sume } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 719156952Sume statp->options &= 720156952Sume ~RES_NO_NIBBLE2; 721156952Sume } 722156952Sume } 723156956Sume#endif 724156952Sume else { 725156952Sume /* XXX - print a warning here? */ 726156952Sume } 727156956Sume#ifndef _LIBC 728156952Sume skip: 729156956Sume#endif 730156952Sume /* skip to next run of spaces */ 731156952Sume while (*cp && *cp != ' ' && *cp != '\t') 732156952Sume cp++; 733156952Sume } 734156952Sume} 735156952Sume 736156952Sume#ifdef RESOLVSORT 737156952Sume/* XXX - should really support CIDR which means explicit masks always. */ 738156952Sumestatic u_int32_t 739288114Srodrigcnet_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 740156952Sume{ 741156956Sume u_int32_t i = ntohl(in.s_addr); 742156952Sume 743156952Sume if (IN_CLASSA(i)) 744156952Sume return (htonl(IN_CLASSA_NET)); 745156952Sume else if (IN_CLASSB(i)) 746156952Sume return (htonl(IN_CLASSB_NET)); 747156952Sume return (htonl(IN_CLASSC_NET)); 748156952Sume} 749156952Sume#endif 750156952Sume 751269867Sumestatic u_char srnd[16]; 752269867Sume 753269867Sumevoid 754269867Sumeres_rndinit(res_state statp) 755269867Sume{ 756269867Sume struct timeval now; 757269867Sume u_int32_t u32; 758269867Sume u_int16_t u16; 759269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 760269867Sume 761269867Sume gettimeofday(&now, NULL); 762269867Sume u32 = now.tv_sec; 763269867Sume memcpy(rnd, &u32, 4); 764269867Sume u32 = now.tv_usec; 765269867Sume memcpy(rnd + 4, &u32, 4); 766269867Sume u32 += now.tv_sec; 767269867Sume memcpy(rnd + 8, &u32, 4); 768269867Sume u16 = getpid(); 769269867Sume memcpy(rnd + 12, &u16, 2); 770269867Sume} 771269867Sume 772156952Sumeu_int 773269867Sumeres_nrandomid(res_state statp) { 774156952Sume struct timeval now; 775269867Sume u_int16_t u16; 776269867Sume MD5_CTX ctx; 777269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 778156952Sume 779156952Sume gettimeofday(&now, NULL); 780269867Sume u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 781269867Sume memcpy(rnd + 14, &u16, 2); 782269867Sume#ifndef HAVE_MD5 783269867Sume MD5_Init(&ctx); 784269867Sume MD5_Update(&ctx, rnd, 16); 785269867Sume MD5_Final(rnd, &ctx); 786269867Sume#else 787269867Sume MD5Init(&ctx); 788269867Sume MD5Update(&ctx, rnd, 16); 789269867Sume MD5Final(rnd, &ctx); 790269867Sume#endif 791269867Sume memcpy(&u16, rnd + 14, 2); 792269867Sume return ((u_int) u16); 793156952Sume} 794156952Sume 795170244Sume/*% 796156952Sume * This routine is for closing the socket if a virtual circuit is used and 797156952Sume * the program wants to close it. This provides support for endhostent() 798156952Sume * which expects to close the socket. 799156952Sume * 800156952Sume * This routine is not expected to be user visible. 801156952Sume */ 802156952Sumevoid 803156952Sumeres_nclose(res_state statp) { 804156952Sume int ns; 805156952Sume 806156952Sume if (statp->_vcsock >= 0) { 807160965Sume (void) _close(statp->_vcsock); 808156952Sume statp->_vcsock = -1; 809156952Sume statp->_flags &= ~(RES_F_VC | RES_F_CONN); 810156952Sume } 811156952Sume for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 812156952Sume if (statp->_u._ext.nssocks[ns] != -1) { 813160965Sume (void) _close(statp->_u._ext.nssocks[ns]); 814156952Sume statp->_u._ext.nssocks[ns] = -1; 815156952Sume } 816156952Sume } 817156952Sume} 818156952Sume 819156952Sumevoid 820156952Sumeres_ndestroy(res_state statp) { 821156952Sume res_nclose(statp); 822269867Sume if (statp->_u._ext.ext != NULL) { 823156952Sume free(statp->_u._ext.ext); 824269867Sume statp->_u._ext.ext = NULL; 825269867Sume } 826269867Sume if (statp->_rnd != NULL) { 827269867Sume free(statp->_rnd); 828269867Sume statp->_rnd = NULL; 829269867Sume } 830156952Sume statp->options &= ~RES_INIT; 831156952Sume} 832156952Sume 833156956Sume#ifndef _LIBC 834156952Sumeconst char * 835156952Sumeres_get_nibblesuffix(res_state statp) { 836156952Sume if (statp->_u._ext.ext) 837156952Sume return (statp->_u._ext.ext->nsuffix); 838156952Sume return ("ip6.arpa"); 839156952Sume} 840156952Sume 841156952Sumeconst char * 842156952Sumeres_get_nibblesuffix2(res_state statp) { 843156952Sume if (statp->_u._ext.ext) 844156952Sume return (statp->_u._ext.ext->nsuffix2); 845156952Sume return ("ip6.int"); 846156952Sume} 847156956Sume#endif 848156952Sume 849156952Sumevoid 850156952Sumeres_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 851156952Sume int i, nserv; 852156952Sume size_t size; 853156952Sume 854156952Sume /* close open servers */ 855156952Sume res_nclose(statp); 856156952Sume 857156952Sume /* cause rtt times to be forgotten */ 858156952Sume statp->_u._ext.nscount = 0; 859156952Sume 860156952Sume nserv = 0; 861156952Sume for (i = 0; i < cnt && nserv < MAXNS; i++) { 862156952Sume switch (set->sin.sin_family) { 863156952Sume case AF_INET: 864156952Sume size = sizeof(set->sin); 865156952Sume if (statp->_u._ext.ext) 866156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 867156952Sume &set->sin, size); 868156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 869156952Sume memcpy(&statp->nsaddr_list[nserv], 870156952Sume &set->sin, size); 871156952Sume else 872156952Sume statp->nsaddr_list[nserv].sin_family = 0; 873156952Sume nserv++; 874156952Sume break; 875156952Sume 876156952Sume#ifdef HAS_INET6_STRUCTS 877156952Sume case AF_INET6: 878156952Sume size = sizeof(set->sin6); 879156952Sume if (statp->_u._ext.ext) 880156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 881156952Sume &set->sin6, size); 882156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 883156952Sume memcpy(&statp->nsaddr_list[nserv], 884156952Sume &set->sin6, size); 885156952Sume else 886156952Sume statp->nsaddr_list[nserv].sin_family = 0; 887156952Sume nserv++; 888156952Sume break; 889156952Sume#endif 890156952Sume 891156952Sume default: 892156952Sume break; 893156952Sume } 894156952Sume set++; 895156952Sume } 896156952Sume statp->nscount = nserv; 897156952Sume 898156952Sume} 899156952Sume 900156952Sumeint 901156952Sumeres_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 902156952Sume int i; 903156952Sume size_t size; 904156952Sume u_int16_t family; 905156952Sume 906156952Sume for (i = 0; i < statp->nscount && i < cnt; i++) { 907156952Sume if (statp->_u._ext.ext) 908156952Sume family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 909156952Sume else 910156952Sume family = statp->nsaddr_list[i].sin_family; 911156952Sume 912156952Sume switch (family) { 913156952Sume case AF_INET: 914156952Sume size = sizeof(set->sin); 915156952Sume if (statp->_u._ext.ext) 916156952Sume memcpy(&set->sin, 917156952Sume &statp->_u._ext.ext->nsaddrs[i], 918156952Sume size); 919156952Sume else 920156952Sume memcpy(&set->sin, &statp->nsaddr_list[i], 921156952Sume size); 922156952Sume break; 923156952Sume 924156952Sume#ifdef HAS_INET6_STRUCTS 925156952Sume case AF_INET6: 926156952Sume size = sizeof(set->sin6); 927156952Sume if (statp->_u._ext.ext) 928156952Sume memcpy(&set->sin6, 929156952Sume &statp->_u._ext.ext->nsaddrs[i], 930156952Sume size); 931156952Sume else 932156952Sume memcpy(&set->sin6, &statp->nsaddr_list[i], 933156952Sume size); 934156952Sume break; 935156952Sume#endif 936156952Sume 937156952Sume default: 938156952Sume set->sin.sin_family = 0; 939156952Sume break; 940156952Sume } 941156952Sume set++; 942156952Sume } 943156952Sume return (statp->nscount); 944156952Sume} 945170244Sume 946170244Sume/*! \file */ 947