res_init.c revision 298830
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 298830 2016-04-30 01:24:24Z pfg $"); 73156952Sume 74156952Sume#include "port_before.h" 75156952Sume 76160965Sume#include "namespace.h" 77160965Sume 78156952Sume#include <sys/param.h> 79156952Sume#include <sys/socket.h> 80289315Svangyzen#include <sys/stat.h> 81156952Sume#include <sys/time.h> 82156952Sume 83156952Sume#include <netinet/in.h> 84156952Sume#include <arpa/inet.h> 85156952Sume#include <arpa/nameser.h> 86156952Sume 87156952Sume#include <ctype.h> 88156952Sume#include <stdio.h> 89156952Sume#include <stdlib.h> 90156952Sume#include <string.h> 91156952Sume#include <unistd.h> 92156952Sume#include <netdb.h> 93156952Sume 94269867Sume#ifndef HAVE_MD5 95269867Sume# include "../dst/md5.h" 96269867Sume#else 97269867Sume# ifdef SOLARIS2 98269867Sume# include <sys/md5.h> 99269867Sume# elif _LIBC 100269867Sume# include <md5.h> 101269867Sume# endif 102269867Sume#endif 103269867Sume#ifndef _MD5_H_ 104269867Sume# define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 105269867Sume#endif 106269867Sume 107160965Sume#include "un-namespace.h" 108160965Sume 109156952Sume#include "port_after.h" 110156952Sume 111156952Sume/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ 112156952Sume#include <resolv.h> 113156952Sume 114156952Sume#include "res_private.h" 115156952Sume 116170244Sume/*% Options. Should all be left alone. */ 117156952Sume#define RESOLVSORT 118292250Sngie#ifndef DEBUG 119292250Sngie#define DEBUG 120292250Sngie#endif 121156952Sume 122156952Sume#ifdef SOLARIS2 123156952Sume#include <sys/systeminfo.h> 124156952Sume#endif 125156952Sume 126156956Sumestatic void res_setoptions(res_state, const char *, const char *); 127156952Sume 128156952Sume#ifdef RESOLVSORT 129156952Sumestatic const char sort_mask[] = "/&"; 130156952Sume#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 131156956Sumestatic u_int32_t net_mask(struct in_addr); 132156952Sume#endif 133156952Sume 134170244Sume#if !defined(isascii) /*%< XXX - could be a function */ 135156952Sume# define isascii(c) (!(c & 0200)) 136156952Sume#endif 137156952Sume 138156952Sume/* 139156952Sume * Resolver state default settings. 140156952Sume */ 141156952Sume 142170244Sume/*% 143156952Sume * Set up default settings. If the configuration file exist, the values 144156952Sume * there will have precedence. Otherwise, the server address is set to 145156952Sume * INADDR_ANY and the default domain name comes from the gethostname(). 146156952Sume * 147298830Spfg * An interim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 148156952Sume * rather than INADDR_ANY ("0.0.0.0") as the default name server address 149156952Sume * since it was noted that INADDR_ANY actually meant ``the first interface 150156952Sume * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 151156952Sume * it had to be "up" in order for you to reach your own name server. It 152156952Sume * was later decided that since the recommended practice is to always 153156952Sume * install local static routes through 127.0.0.1 for all your network 154156952Sume * interfaces, that we could solve this problem without a code change. 155156952Sume * 156156952Sume * The configuration file should always be used, since it is the only way 157156952Sume * to specify a default domain. If you are running a server on your local 158156952Sume * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 159156952Sume * in the configuration file. 160156952Sume * 161156952Sume * Return 0 if completes successfully, -1 on error 162156952Sume */ 163156952Sumeint 164156952Sumeres_ninit(res_state statp) { 165156952Sume extern int __res_vinit(res_state, int); 166156952Sume 167156952Sume return (__res_vinit(statp, 0)); 168156952Sume} 169156952Sume 170298830Spfg/*% This function has to be reachable by res_data.c but not publicly. */ 171156952Sumeint 172156952Sume__res_vinit(res_state statp, int preinit) { 173156956Sume FILE *fp; 174156956Sume char *cp, **pp; 175156956Sume int n; 176156952Sume char buf[BUFSIZ]; 177170244Sume int nserv = 0; /*%< number of nameserver records read from file */ 178156952Sume int haveenv = 0; 179156952Sume int havesearch = 0; 180156952Sume#ifdef RESOLVSORT 181156952Sume int nsort = 0; 182156952Sume char *net; 183156952Sume#endif 184156952Sume int dots; 185156952Sume union res_sockaddr_union u[2]; 186174226Sume int maxns = MAXNS; 187156952Sume 188174226Sume RES_SET_H_ERRNO(statp, 0); 189156952Sume if (statp->_u._ext.ext != NULL) 190156952Sume res_ndestroy(statp); 191156952Sume 192156952Sume if (!preinit) { 193156952Sume statp->retrans = RES_TIMEOUT; 194156952Sume statp->retry = RES_DFLRETRY; 195156952Sume statp->options = RES_DEFAULT; 196156952Sume } 197156952Sume 198269867Sume statp->_rnd = malloc(16); 199269867Sume res_rndinit(statp); 200269867Sume statp->id = res_nrandomid(statp); 201269867Sume 202156952Sume memset(u, 0, sizeof(u)); 203156952Sume#ifdef USELOOPBACK 204156952Sume u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 205156952Sume#else 206156952Sume u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 207156952Sume#endif 208156952Sume u[nserv].sin.sin_family = AF_INET; 209156952Sume u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 210156952Sume#ifdef HAVE_SA_LEN 211156952Sume u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 212156952Sume#endif 213156952Sume nserv++; 214156952Sume#ifdef HAS_INET6_STRUCTS 215156952Sume#ifdef USELOOPBACK 216156952Sume u[nserv].sin6.sin6_addr = in6addr_loopback; 217156952Sume#else 218156952Sume u[nserv].sin6.sin6_addr = in6addr_any; 219156952Sume#endif 220156952Sume u[nserv].sin6.sin6_family = AF_INET6; 221156952Sume u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 222156952Sume#ifdef HAVE_SA_LEN 223156952Sume u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 224156952Sume#endif 225156952Sume nserv++; 226156952Sume#endif 227156952Sume statp->nscount = 0; 228156952Sume statp->ndots = 1; 229156952Sume statp->pfcode = 0; 230156952Sume statp->_vcsock = -1; 231156952Sume statp->_flags = 0; 232156952Sume statp->qhook = NULL; 233156952Sume statp->rhook = NULL; 234156952Sume statp->_u._ext.nscount = 0; 235156952Sume statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 236156952Sume if (statp->_u._ext.ext != NULL) { 237156952Sume memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 238156952Sume statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 239156952Sume strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 240156952Sume strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 241292216Svangyzen statp->_u._ext.ext->reload_period = 2; 242174226Sume } else { 243174226Sume /* 244174226Sume * Historically res_init() rarely, if at all, failed. 245174226Sume * Examples and applications exist which do not check 246174226Sume * our return code. Furthermore several applications 247174226Sume * simply call us to get the systems domainname. So 248174226Sume * rather then immediately fail here we store the 249174226Sume * failure, which is returned later, in h_errno. And 250174226Sume * prevent the collection of 'nameserver' information 251174226Sume * by setting maxns to 0. Thus applications that fail 252174226Sume * to check our return code wont be able to make 253174226Sume * queries anyhow. 254174226Sume */ 255174226Sume RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 256174226Sume maxns = 0; 257174226Sume } 258156952Sume#ifdef RESOLVSORT 259156952Sume statp->nsort = 0; 260156952Sume#endif 261156952Sume res_setservers(statp, u, nserv); 262156952Sume 263156952Sume#ifdef SOLARIS2 264156952Sume /* 265156952Sume * The old libresolv derived the defaultdomain from NIS/NIS+. 266156952Sume * We want to keep this behaviour 267156952Sume */ 268156952Sume { 269156952Sume char buf[sizeof(statp->defdname)], *cp; 270156952Sume int ret; 271156952Sume 272156952Sume if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 273156952Sume (unsigned int)ret <= sizeof(buf)) { 274156952Sume if (buf[0] == '+') 275156952Sume buf[0] = '.'; 276156952Sume cp = strchr(buf, '.'); 277165258Sume cp = (cp == NULL) ? buf : (cp + 1); 278174226Sume strncpy(statp->defdname, cp, 279174226Sume sizeof(statp->defdname) - 1); 280174226Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 281156952Sume } 282156952Sume } 283156952Sume#endif /* SOLARIS2 */ 284156952Sume 285156952Sume /* Allow user to override the local domain definition */ 286156956Sume if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 287156952Sume (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 288156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 289156952Sume haveenv++; 290156952Sume 291156952Sume /* 292156952Sume * Set search list to be blank-separated strings 293156952Sume * from rest of env value. Permits users of LOCALDOMAIN 294156952Sume * to still have a search list, and anyone to set the 295156952Sume * one that they want to use as an individual (even more 296156952Sume * important now that the rfc1535 stuff restricts searches) 297156952Sume */ 298156952Sume cp = statp->defdname; 299156952Sume pp = statp->dnsrch; 300156952Sume *pp++ = cp; 301156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 302170244Sume if (*cp == '\n') /*%< silly backwards compat */ 303156952Sume break; 304156952Sume else if (*cp == ' ' || *cp == '\t') { 305156952Sume *cp = 0; 306156952Sume n = 1; 307156952Sume } else if (n) { 308156952Sume *pp++ = cp; 309156952Sume n = 0; 310156952Sume havesearch = 1; 311156952Sume } 312156952Sume } 313156952Sume /* null terminate last domain if there are excess */ 314156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 315156952Sume cp++; 316156952Sume *cp = '\0'; 317297790Spfg *pp++ = NULL; 318156952Sume } 319156952Sume 320156952Sume#define MATCH(line, name) \ 321156952Sume (!strncmp(line, name, sizeof(name) - 1) && \ 322156952Sume (line[sizeof(name) - 1] == ' ' || \ 323156952Sume line[sizeof(name) - 1] == '\t')) 324156952Sume 325156952Sume nserv = 0; 326254700Sjilles if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 327289315Svangyzen struct stat sb; 328289315Svangyzen struct timespec now; 329289315Svangyzen 330292216Svangyzen if (statp->_u._ext.ext != NULL) { 331292216Svangyzen if (_fstat(fileno(fp), &sb) == 0) { 332292216Svangyzen statp->_u._ext.ext->conf_mtim = sb.st_mtim; 333292216Svangyzen if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 334292216Svangyzen statp->_u._ext.ext->conf_stat = now.tv_sec; 335292216Svangyzen } 336289315Svangyzen } 337289315Svangyzen } 338289315Svangyzen 339156952Sume /* read the config file */ 340156952Sume while (fgets(buf, sizeof(buf), fp) != NULL) { 341156952Sume /* skip comments */ 342156952Sume if (*buf == ';' || *buf == '#') 343156952Sume continue; 344156952Sume /* read default domain name */ 345156952Sume if (MATCH(buf, "domain")) { 346170244Sume if (haveenv) /*%< skip if have from environ */ 347156952Sume continue; 348156952Sume cp = buf + sizeof("domain") - 1; 349156952Sume while (*cp == ' ' || *cp == '\t') 350156952Sume cp++; 351156952Sume if ((*cp == '\0') || (*cp == '\n')) 352156952Sume continue; 353156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 354156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 355156952Sume if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 356156952Sume *cp = '\0'; 357156952Sume havesearch = 0; 358156952Sume continue; 359156952Sume } 360156952Sume /* set search list */ 361156952Sume if (MATCH(buf, "search")) { 362170244Sume if (haveenv) /*%< skip if have from environ */ 363156952Sume continue; 364156952Sume cp = buf + sizeof("search") - 1; 365156952Sume while (*cp == ' ' || *cp == '\t') 366156952Sume cp++; 367156952Sume if ((*cp == '\0') || (*cp == '\n')) 368156952Sume continue; 369156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 370156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 371156952Sume if ((cp = strchr(statp->defdname, '\n')) != NULL) 372156952Sume *cp = '\0'; 373156952Sume /* 374156952Sume * Set search list to be blank-separated strings 375156952Sume * on rest of line. 376156952Sume */ 377156952Sume cp = statp->defdname; 378156952Sume pp = statp->dnsrch; 379156952Sume *pp++ = cp; 380156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 381156952Sume if (*cp == ' ' || *cp == '\t') { 382156952Sume *cp = 0; 383156952Sume n = 1; 384156952Sume } else if (n) { 385156952Sume *pp++ = cp; 386156952Sume n = 0; 387156952Sume } 388156952Sume } 389156952Sume /* null terminate last domain if there are excess */ 390156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t') 391156952Sume cp++; 392156952Sume *cp = '\0'; 393297790Spfg *pp++ = NULL; 394156952Sume havesearch = 1; 395156952Sume continue; 396156952Sume } 397156952Sume /* read nameservers to query */ 398174226Sume if (MATCH(buf, "nameserver") && nserv < maxns) { 399156952Sume struct addrinfo hints, *ai; 400156952Sume char sbuf[NI_MAXSERV]; 401156952Sume const size_t minsiz = 402156952Sume sizeof(statp->_u._ext.ext->nsaddrs[0]); 403156952Sume 404156952Sume cp = buf + sizeof("nameserver") - 1; 405156952Sume while (*cp == ' ' || *cp == '\t') 406156952Sume cp++; 407156952Sume cp[strcspn(cp, ";# \t\n")] = '\0'; 408156952Sume if ((*cp != '\0') && (*cp != '\n')) { 409156952Sume memset(&hints, 0, sizeof(hints)); 410156952Sume hints.ai_family = PF_UNSPEC; 411156952Sume hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 412156952Sume hints.ai_flags = AI_NUMERICHOST; 413156952Sume sprintf(sbuf, "%u", NAMESERVER_PORT); 414156952Sume if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 415156952Sume ai->ai_addrlen <= minsiz) { 416156952Sume if (statp->_u._ext.ext != NULL) { 417156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 418156952Sume ai->ai_addr, ai->ai_addrlen); 419156952Sume } 420156952Sume if (ai->ai_addrlen <= 421156952Sume sizeof(statp->nsaddr_list[nserv])) { 422156952Sume memcpy(&statp->nsaddr_list[nserv], 423156952Sume ai->ai_addr, ai->ai_addrlen); 424156952Sume } else 425156952Sume statp->nsaddr_list[nserv].sin_family = 0; 426156952Sume freeaddrinfo(ai); 427156952Sume nserv++; 428156952Sume } 429156952Sume } 430156952Sume continue; 431156952Sume } 432156952Sume#ifdef RESOLVSORT 433156952Sume if (MATCH(buf, "sortlist")) { 434156952Sume struct in_addr a; 435156956Sume struct in6_addr a6; 436156956Sume int m, i; 437156956Sume u_char *u; 438156956Sume struct __res_state_ext *ext = statp->_u._ext.ext; 439156952Sume 440156952Sume cp = buf + sizeof("sortlist") - 1; 441156952Sume while (nsort < MAXRESOLVSORT) { 442156952Sume while (*cp == ' ' || *cp == '\t') 443156952Sume cp++; 444156952Sume if (*cp == '\0' || *cp == '\n' || *cp == ';') 445156952Sume break; 446156952Sume net = cp; 447156952Sume while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 448156952Sume isascii(*cp) && !isspace((unsigned char)*cp)) 449156952Sume cp++; 450156952Sume n = *cp; 451156952Sume *cp = 0; 452156952Sume if (inet_aton(net, &a)) { 453156952Sume statp->sort_list[nsort].addr = a; 454156952Sume if (ISSORTMASK(n)) { 455156952Sume *cp++ = n; 456156952Sume net = cp; 457156952Sume while (*cp && *cp != ';' && 458156952Sume isascii(*cp) && 459156952Sume !isspace((unsigned char)*cp)) 460156952Sume cp++; 461156952Sume n = *cp; 462156952Sume *cp = 0; 463156952Sume if (inet_aton(net, &a)) { 464156952Sume statp->sort_list[nsort].mask = a.s_addr; 465156952Sume } else { 466156952Sume statp->sort_list[nsort].mask = 467156952Sume net_mask(statp->sort_list[nsort].addr); 468156952Sume } 469156952Sume } else { 470156952Sume statp->sort_list[nsort].mask = 471156952Sume net_mask(statp->sort_list[nsort].addr); 472156952Sume } 473156956Sume ext->sort_list[nsort].af = AF_INET; 474156956Sume ext->sort_list[nsort].addr.ina = 475156956Sume statp->sort_list[nsort].addr; 476156956Sume ext->sort_list[nsort].mask.ina.s_addr = 477156956Sume statp->sort_list[nsort].mask; 478156952Sume nsort++; 479156952Sume } 480156956Sume else if (inet_pton(AF_INET6, net, &a6) == 1) { 481156956Sume 482156956Sume ext->sort_list[nsort].af = AF_INET6; 483156956Sume ext->sort_list[nsort].addr.in6a = a6; 484156956Sume u = (u_char *)&ext->sort_list[nsort].mask.in6a; 485156956Sume *cp++ = n; 486156956Sume net = cp; 487156956Sume while (*cp && *cp != ';' && 488156956Sume isascii(*cp) && !isspace(*cp)) 489156956Sume cp++; 490156956Sume m = n; 491156956Sume n = *cp; 492156956Sume *cp = 0; 493156956Sume switch (m) { 494156956Sume case '/': 495156956Sume m = atoi(net); 496156956Sume break; 497156956Sume case '&': 498156956Sume if (inet_pton(AF_INET6, net, u) == 1) { 499156956Sume m = -1; 500156956Sume break; 501156956Sume } 502156956Sume /*FALLTHROUGH*/ 503156956Sume default: 504156956Sume m = sizeof(struct in6_addr) * CHAR_BIT; 505156956Sume break; 506156956Sume } 507156956Sume if (m >= 0) { 508156956Sume for (i = 0; i < sizeof(struct in6_addr); i++) { 509156956Sume if (m <= 0) { 510156956Sume *u = 0; 511156956Sume } else { 512156956Sume m -= CHAR_BIT; 513156956Sume *u = (u_char)~0; 514156956Sume if (m < 0) 515156956Sume *u <<= -m; 516156956Sume } 517156956Sume u++; 518156956Sume } 519156956Sume } 520156956Sume statp->sort_list[nsort].addr.s_addr = 521156956Sume (u_int32_t)0xffffffff; 522156956Sume statp->sort_list[nsort].mask = 523156956Sume (u_int32_t)0xffffffff; 524156956Sume nsort++; 525156956Sume } 526156952Sume *cp = n; 527156952Sume } 528156952Sume continue; 529156952Sume } 530156952Sume#endif 531156952Sume if (MATCH(buf, "options")) { 532156952Sume res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 533156952Sume continue; 534156952Sume } 535156952Sume } 536156952Sume if (nserv > 0) 537156952Sume statp->nscount = nserv; 538156952Sume#ifdef RESOLVSORT 539156952Sume statp->nsort = nsort; 540156952Sume#endif 541156952Sume (void) fclose(fp); 542156952Sume } 543156952Sume/* 544156952Sume * Last chance to get a nameserver. This should not normally 545156952Sume * be necessary 546156952Sume */ 547156952Sume#ifdef NO_RESOLV_CONF 548156952Sume if(nserv == 0) 549156952Sume nserv = get_nameservers(statp); 550156952Sume#endif 551156952Sume 552156952Sume if (statp->defdname[0] == 0 && 553156952Sume gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 554156952Sume (cp = strchr(buf, '.')) != NULL) 555156952Sume strcpy(statp->defdname, cp + 1); 556156952Sume 557156952Sume /* find components of local domain that might be searched */ 558156952Sume if (havesearch == 0) { 559156952Sume pp = statp->dnsrch; 560156952Sume *pp++ = statp->defdname; 561156952Sume *pp = NULL; 562156952Sume 563156952Sume dots = 0; 564156952Sume for (cp = statp->defdname; *cp; cp++) 565156952Sume dots += (*cp == '.'); 566156952Sume 567156952Sume cp = statp->defdname; 568156952Sume while (pp < statp->dnsrch + MAXDFLSRCH) { 569156952Sume if (dots < LOCALDOMAINPARTS) 570156952Sume break; 571170244Sume cp = strchr(cp, '.') + 1; /*%< we know there is one */ 572156952Sume *pp++ = cp; 573156952Sume dots--; 574156952Sume } 575156952Sume *pp = NULL; 576156952Sume#ifdef DEBUG 577156952Sume if (statp->options & RES_DEBUG) { 578156952Sume printf(";; res_init()... default dnsrch list:\n"); 579156952Sume for (pp = statp->dnsrch; *pp; pp++) 580156952Sume printf(";;\t%s\n", *pp); 581156952Sume printf(";;\t..END..\n"); 582156952Sume } 583156952Sume#endif 584156952Sume } 585156952Sume 586156956Sume if (issetugid()) 587156956Sume statp->options |= RES_NOALIASES; 588156956Sume else if ((cp = getenv("RES_OPTIONS")) != NULL) 589156952Sume res_setoptions(statp, cp, "env"); 590156952Sume statp->options |= RES_INIT; 591174226Sume return (statp->res_h_errno); 592156952Sume} 593156952Sume 594156952Sumestatic void 595156952Sumeres_setoptions(res_state statp, const char *options, const char *source) 596156952Sume{ 597156952Sume const char *cp = options; 598156952Sume int i; 599156952Sume struct __res_state_ext *ext = statp->_u._ext.ext; 600156952Sume 601156952Sume#ifdef DEBUG 602156952Sume if (statp->options & RES_DEBUG) 603156952Sume printf(";; res_setoptions(\"%s\", \"%s\")...\n", 604156952Sume options, source); 605156952Sume#endif 606156952Sume while (*cp) { 607156952Sume /* skip leading and inner runs of spaces */ 608156952Sume while (*cp == ' ' || *cp == '\t') 609156952Sume cp++; 610156952Sume /* search for and process individual options */ 611156952Sume if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 612156952Sume i = atoi(cp + sizeof("ndots:") - 1); 613156952Sume if (i <= RES_MAXNDOTS) 614156952Sume statp->ndots = i; 615156952Sume else 616156952Sume statp->ndots = RES_MAXNDOTS; 617156952Sume#ifdef DEBUG 618156952Sume if (statp->options & RES_DEBUG) 619156952Sume printf(";;\tndots=%d\n", statp->ndots); 620156952Sume#endif 621156952Sume } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 622156952Sume i = atoi(cp + sizeof("timeout:") - 1); 623156952Sume if (i <= RES_MAXRETRANS) 624156952Sume statp->retrans = i; 625156952Sume else 626156952Sume statp->retrans = RES_MAXRETRANS; 627156952Sume#ifdef DEBUG 628156952Sume if (statp->options & RES_DEBUG) 629156952Sume printf(";;\ttimeout=%d\n", statp->retrans); 630156952Sume#endif 631156952Sume#ifdef SOLARIS2 632156952Sume } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 633156952Sume /* 634156952Sume * For backward compatibility, 'retrans' is 635156952Sume * supported as an alias for 'timeout', though 636156952Sume * without an imposed maximum. 637156952Sume */ 638156952Sume statp->retrans = atoi(cp + sizeof("retrans:") - 1); 639156952Sume } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 640156952Sume /* 641156952Sume * For backward compatibility, 'retry' is 642156952Sume * supported as an alias for 'attempts', though 643156952Sume * without an imposed maximum. 644156952Sume */ 645156952Sume statp->retry = atoi(cp + sizeof("retry:") - 1); 646156952Sume#endif /* SOLARIS2 */ 647156952Sume } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 648156952Sume i = atoi(cp + sizeof("attempts:") - 1); 649156952Sume if (i <= RES_MAXRETRY) 650156952Sume statp->retry = i; 651156952Sume else 652156952Sume statp->retry = RES_MAXRETRY; 653156952Sume#ifdef DEBUG 654156952Sume if (statp->options & RES_DEBUG) 655156952Sume printf(";;\tattempts=%d\n", statp->retry); 656156952Sume#endif 657156952Sume } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 658156952Sume#ifdef DEBUG 659156952Sume if (!(statp->options & RES_DEBUG)) { 660156952Sume printf(";; res_setoptions(\"%s\", \"%s\")..\n", 661156952Sume options, source); 662156952Sume statp->options |= RES_DEBUG; 663156952Sume } 664156952Sume printf(";;\tdebug\n"); 665156952Sume#endif 666156952Sume } else if (!strncmp(cp, "no_tld_query", 667156952Sume sizeof("no_tld_query") - 1) || 668156952Sume !strncmp(cp, "no-tld-query", 669156952Sume sizeof("no-tld-query") - 1)) { 670156952Sume statp->options |= RES_NOTLDQUERY; 671156952Sume } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 672156952Sume statp->options |= RES_USE_INET6; 673156956Sume } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 674156956Sume statp->options |= RES_INSECURE1; 675156956Sume } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 676156956Sume statp->options |= RES_INSECURE2; 677156952Sume } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 678156952Sume statp->options |= RES_ROTATE; 679156952Sume } else if (!strncmp(cp, "no-check-names", 680156952Sume sizeof("no-check-names") - 1)) { 681156952Sume statp->options |= RES_NOCHECKNAME; 682289315Svangyzen } else if (!strncmp(cp, "reload-period:", 683289315Svangyzen sizeof("reload-period:") - 1)) { 684292216Svangyzen if (ext != NULL) { 685292216Svangyzen ext->reload_period = (u_short) 686292216Svangyzen atoi(cp + sizeof("reload-period:") - 1); 687292216Svangyzen } 688156952Sume } 689156952Sume#ifdef RES_USE_EDNS0 690156952Sume else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 691156952Sume statp->options |= RES_USE_EDNS0; 692156952Sume } 693156952Sume#endif 694156956Sume#ifndef _LIBC 695156952Sume else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 696156952Sume statp->options |= RES_USE_DNAME; 697156952Sume } 698156952Sume else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 699156952Sume if (ext == NULL) 700156952Sume goto skip; 701156952Sume cp += sizeof("nibble:") - 1; 702156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 703156952Sume strncpy(ext->nsuffix, cp, i); 704156952Sume ext->nsuffix[i] = '\0'; 705156952Sume } 706156952Sume else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 707156952Sume if (ext == NULL) 708156952Sume goto skip; 709156952Sume cp += sizeof("nibble2:") - 1; 710156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 711156952Sume strncpy(ext->nsuffix2, cp, i); 712156952Sume ext->nsuffix2[i] = '\0'; 713156952Sume } 714156952Sume else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 715156952Sume cp += sizeof("v6revmode:") - 1; 716156952Sume /* "nibble" and "bitstring" used to be valid */ 717156952Sume if (!strncmp(cp, "single", sizeof("single") - 1)) { 718156952Sume statp->options |= RES_NO_NIBBLE2; 719156952Sume } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 720156952Sume statp->options &= 721156952Sume ~RES_NO_NIBBLE2; 722156952Sume } 723156952Sume } 724156956Sume#endif 725156952Sume else { 726156952Sume /* XXX - print a warning here? */ 727156952Sume } 728156956Sume#ifndef _LIBC 729156952Sume skip: 730156956Sume#endif 731156952Sume /* skip to next run of spaces */ 732156952Sume while (*cp && *cp != ' ' && *cp != '\t') 733156952Sume cp++; 734156952Sume } 735156952Sume} 736156952Sume 737156952Sume#ifdef RESOLVSORT 738156952Sume/* XXX - should really support CIDR which means explicit masks always. */ 739156952Sumestatic u_int32_t 740288114Srodrigcnet_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 741156952Sume{ 742156956Sume u_int32_t i = ntohl(in.s_addr); 743156952Sume 744156952Sume if (IN_CLASSA(i)) 745156952Sume return (htonl(IN_CLASSA_NET)); 746156952Sume else if (IN_CLASSB(i)) 747156952Sume return (htonl(IN_CLASSB_NET)); 748156952Sume return (htonl(IN_CLASSC_NET)); 749156952Sume} 750156952Sume#endif 751156952Sume 752269867Sumestatic u_char srnd[16]; 753269867Sume 754269867Sumevoid 755269867Sumeres_rndinit(res_state statp) 756269867Sume{ 757269867Sume struct timeval now; 758269867Sume u_int32_t u32; 759269867Sume u_int16_t u16; 760269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 761269867Sume 762269867Sume gettimeofday(&now, NULL); 763269867Sume u32 = now.tv_sec; 764269867Sume memcpy(rnd, &u32, 4); 765269867Sume u32 = now.tv_usec; 766269867Sume memcpy(rnd + 4, &u32, 4); 767269867Sume u32 += now.tv_sec; 768269867Sume memcpy(rnd + 8, &u32, 4); 769269867Sume u16 = getpid(); 770269867Sume memcpy(rnd + 12, &u16, 2); 771269867Sume} 772269867Sume 773156952Sumeu_int 774269867Sumeres_nrandomid(res_state statp) { 775156952Sume struct timeval now; 776269867Sume u_int16_t u16; 777269867Sume MD5_CTX ctx; 778269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 779156952Sume 780156952Sume gettimeofday(&now, NULL); 781269867Sume u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 782269867Sume memcpy(rnd + 14, &u16, 2); 783269867Sume#ifndef HAVE_MD5 784269867Sume MD5_Init(&ctx); 785269867Sume MD5_Update(&ctx, rnd, 16); 786269867Sume MD5_Final(rnd, &ctx); 787269867Sume#else 788269867Sume MD5Init(&ctx); 789269867Sume MD5Update(&ctx, rnd, 16); 790269867Sume MD5Final(rnd, &ctx); 791269867Sume#endif 792269867Sume memcpy(&u16, rnd + 14, 2); 793269867Sume return ((u_int) u16); 794156952Sume} 795156952Sume 796170244Sume/*% 797156952Sume * This routine is for closing the socket if a virtual circuit is used and 798156952Sume * the program wants to close it. This provides support for endhostent() 799156952Sume * which expects to close the socket. 800156952Sume * 801156952Sume * This routine is not expected to be user visible. 802156952Sume */ 803156952Sumevoid 804156952Sumeres_nclose(res_state statp) { 805156952Sume int ns; 806156952Sume 807156952Sume if (statp->_vcsock >= 0) { 808160965Sume (void) _close(statp->_vcsock); 809156952Sume statp->_vcsock = -1; 810156952Sume statp->_flags &= ~(RES_F_VC | RES_F_CONN); 811156952Sume } 812156952Sume for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 813156952Sume if (statp->_u._ext.nssocks[ns] != -1) { 814160965Sume (void) _close(statp->_u._ext.nssocks[ns]); 815156952Sume statp->_u._ext.nssocks[ns] = -1; 816156952Sume } 817156952Sume } 818156952Sume} 819156952Sume 820156952Sumevoid 821156952Sumeres_ndestroy(res_state statp) { 822156952Sume res_nclose(statp); 823269867Sume if (statp->_u._ext.ext != NULL) { 824156952Sume free(statp->_u._ext.ext); 825269867Sume statp->_u._ext.ext = NULL; 826269867Sume } 827269867Sume if (statp->_rnd != NULL) { 828269867Sume free(statp->_rnd); 829269867Sume statp->_rnd = NULL; 830269867Sume } 831156952Sume statp->options &= ~RES_INIT; 832156952Sume} 833156952Sume 834156956Sume#ifndef _LIBC 835156952Sumeconst char * 836156952Sumeres_get_nibblesuffix(res_state statp) { 837156952Sume if (statp->_u._ext.ext) 838156952Sume return (statp->_u._ext.ext->nsuffix); 839156952Sume return ("ip6.arpa"); 840156952Sume} 841156952Sume 842156952Sumeconst char * 843156952Sumeres_get_nibblesuffix2(res_state statp) { 844156952Sume if (statp->_u._ext.ext) 845156952Sume return (statp->_u._ext.ext->nsuffix2); 846156952Sume return ("ip6.int"); 847156952Sume} 848156956Sume#endif 849156952Sume 850156952Sumevoid 851156952Sumeres_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 852156952Sume int i, nserv; 853156952Sume size_t size; 854156952Sume 855156952Sume /* close open servers */ 856156952Sume res_nclose(statp); 857156952Sume 858156952Sume /* cause rtt times to be forgotten */ 859156952Sume statp->_u._ext.nscount = 0; 860156952Sume 861156952Sume nserv = 0; 862156952Sume for (i = 0; i < cnt && nserv < MAXNS; i++) { 863156952Sume switch (set->sin.sin_family) { 864156952Sume case AF_INET: 865156952Sume size = sizeof(set->sin); 866156952Sume if (statp->_u._ext.ext) 867156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 868156952Sume &set->sin, size); 869156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 870156952Sume memcpy(&statp->nsaddr_list[nserv], 871156952Sume &set->sin, size); 872156952Sume else 873156952Sume statp->nsaddr_list[nserv].sin_family = 0; 874156952Sume nserv++; 875156952Sume break; 876156952Sume 877156952Sume#ifdef HAS_INET6_STRUCTS 878156952Sume case AF_INET6: 879156952Sume size = sizeof(set->sin6); 880156952Sume if (statp->_u._ext.ext) 881156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 882156952Sume &set->sin6, size); 883156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 884156952Sume memcpy(&statp->nsaddr_list[nserv], 885156952Sume &set->sin6, size); 886156952Sume else 887156952Sume statp->nsaddr_list[nserv].sin_family = 0; 888156952Sume nserv++; 889156952Sume break; 890156952Sume#endif 891156952Sume 892156952Sume default: 893156952Sume break; 894156952Sume } 895156952Sume set++; 896156952Sume } 897156952Sume statp->nscount = nserv; 898156952Sume 899156952Sume} 900156952Sume 901156952Sumeint 902156952Sumeres_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 903156952Sume int i; 904156952Sume size_t size; 905156952Sume u_int16_t family; 906156952Sume 907156952Sume for (i = 0; i < statp->nscount && i < cnt; i++) { 908156952Sume if (statp->_u._ext.ext) 909156952Sume family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 910156952Sume else 911156952Sume family = statp->nsaddr_list[i].sin_family; 912156952Sume 913156952Sume switch (family) { 914156952Sume case AF_INET: 915156952Sume size = sizeof(set->sin); 916156952Sume if (statp->_u._ext.ext) 917156952Sume memcpy(&set->sin, 918156952Sume &statp->_u._ext.ext->nsaddrs[i], 919156952Sume size); 920156952Sume else 921156952Sume memcpy(&set->sin, &statp->nsaddr_list[i], 922156952Sume size); 923156952Sume break; 924156952Sume 925156952Sume#ifdef HAS_INET6_STRUCTS 926156952Sume case AF_INET6: 927156952Sume size = sizeof(set->sin6); 928156952Sume if (statp->_u._ext.ext) 929156952Sume memcpy(&set->sin6, 930156952Sume &statp->_u._ext.ext->nsaddrs[i], 931156952Sume size); 932156952Sume else 933156952Sume memcpy(&set->sin6, &statp->nsaddr_list[i], 934156952Sume size); 935156952Sume break; 936156952Sume#endif 937156952Sume 938156952Sume default: 939156952Sume set->sin.sin_family = 0; 940156952Sume break; 941156952Sume } 942156952Sume set++; 943156952Sume } 944156952Sume return (statp->nscount); 945156952Sume} 946170244Sume 947170244Sume/*! \file */ 948