res_init.c revision 289315
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 289315 2015-10-14 14:26:44Z 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; 231289315Svangyzen statp->reload_period = 2; 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"); 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 329289315Svangyzen if (_fstat(fileno(fp), &sb) == 0) { 330289315Svangyzen statp->conf_mtim = sb.st_mtim; 331289315Svangyzen if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 332289315Svangyzen statp->conf_stat = now.tv_sec; 333289315Svangyzen } else { 334289315Svangyzen statp->conf_stat = 0; 335289315Svangyzen } 336289315Svangyzen } else { 337289315Svangyzen statp->conf_mtim.tv_sec = 0; 338289315Svangyzen statp->conf_mtim.tv_nsec = 0; 339289315Svangyzen statp->conf_stat = 0; 340289315Svangyzen } 341289315Svangyzen 342156952Sume /* read the config file */ 343156952Sume while (fgets(buf, sizeof(buf), fp) != NULL) { 344156952Sume /* skip comments */ 345156952Sume if (*buf == ';' || *buf == '#') 346156952Sume continue; 347156952Sume /* read default domain name */ 348156952Sume if (MATCH(buf, "domain")) { 349170244Sume if (haveenv) /*%< skip if have from environ */ 350156952Sume continue; 351156952Sume cp = buf + sizeof("domain") - 1; 352156952Sume while (*cp == ' ' || *cp == '\t') 353156952Sume cp++; 354156952Sume if ((*cp == '\0') || (*cp == '\n')) 355156952Sume continue; 356156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 357156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 358156952Sume if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 359156952Sume *cp = '\0'; 360156952Sume havesearch = 0; 361156952Sume continue; 362156952Sume } 363156952Sume /* set search list */ 364156952Sume if (MATCH(buf, "search")) { 365170244Sume if (haveenv) /*%< skip if have from environ */ 366156952Sume continue; 367156952Sume cp = buf + sizeof("search") - 1; 368156952Sume while (*cp == ' ' || *cp == '\t') 369156952Sume cp++; 370156952Sume if ((*cp == '\0') || (*cp == '\n')) 371156952Sume continue; 372156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 373156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 374156952Sume if ((cp = strchr(statp->defdname, '\n')) != NULL) 375156952Sume *cp = '\0'; 376156952Sume /* 377156952Sume * Set search list to be blank-separated strings 378156952Sume * on rest of line. 379156952Sume */ 380156952Sume cp = statp->defdname; 381156952Sume pp = statp->dnsrch; 382156952Sume *pp++ = cp; 383156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 384156952Sume if (*cp == ' ' || *cp == '\t') { 385156952Sume *cp = 0; 386156952Sume n = 1; 387156952Sume } else if (n) { 388156952Sume *pp++ = cp; 389156952Sume n = 0; 390156952Sume } 391156952Sume } 392156952Sume /* null terminate last domain if there are excess */ 393156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t') 394156952Sume cp++; 395156952Sume *cp = '\0'; 396156952Sume *pp++ = 0; 397156952Sume havesearch = 1; 398156952Sume continue; 399156952Sume } 400156952Sume /* read nameservers to query */ 401174226Sume if (MATCH(buf, "nameserver") && nserv < maxns) { 402156952Sume struct addrinfo hints, *ai; 403156952Sume char sbuf[NI_MAXSERV]; 404156952Sume const size_t minsiz = 405156952Sume sizeof(statp->_u._ext.ext->nsaddrs[0]); 406156952Sume 407156952Sume cp = buf + sizeof("nameserver") - 1; 408156952Sume while (*cp == ' ' || *cp == '\t') 409156952Sume cp++; 410156952Sume cp[strcspn(cp, ";# \t\n")] = '\0'; 411156952Sume if ((*cp != '\0') && (*cp != '\n')) { 412156952Sume memset(&hints, 0, sizeof(hints)); 413156952Sume hints.ai_family = PF_UNSPEC; 414156952Sume hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 415156952Sume hints.ai_flags = AI_NUMERICHOST; 416156952Sume sprintf(sbuf, "%u", NAMESERVER_PORT); 417156952Sume if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 418156952Sume ai->ai_addrlen <= minsiz) { 419156952Sume if (statp->_u._ext.ext != NULL) { 420156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 421156952Sume ai->ai_addr, ai->ai_addrlen); 422156952Sume } 423156952Sume if (ai->ai_addrlen <= 424156952Sume sizeof(statp->nsaddr_list[nserv])) { 425156952Sume memcpy(&statp->nsaddr_list[nserv], 426156952Sume ai->ai_addr, ai->ai_addrlen); 427156952Sume } else 428156952Sume statp->nsaddr_list[nserv].sin_family = 0; 429156952Sume freeaddrinfo(ai); 430156952Sume nserv++; 431156952Sume } 432156952Sume } 433156952Sume continue; 434156952Sume } 435156952Sume#ifdef RESOLVSORT 436156952Sume if (MATCH(buf, "sortlist")) { 437156952Sume struct in_addr a; 438156956Sume struct in6_addr a6; 439156956Sume int m, i; 440156956Sume u_char *u; 441156956Sume struct __res_state_ext *ext = statp->_u._ext.ext; 442156952Sume 443156952Sume cp = buf + sizeof("sortlist") - 1; 444156952Sume while (nsort < MAXRESOLVSORT) { 445156952Sume while (*cp == ' ' || *cp == '\t') 446156952Sume cp++; 447156952Sume if (*cp == '\0' || *cp == '\n' || *cp == ';') 448156952Sume break; 449156952Sume net = cp; 450156952Sume while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 451156952Sume isascii(*cp) && !isspace((unsigned char)*cp)) 452156952Sume cp++; 453156952Sume n = *cp; 454156952Sume *cp = 0; 455156952Sume if (inet_aton(net, &a)) { 456156952Sume statp->sort_list[nsort].addr = a; 457156952Sume if (ISSORTMASK(n)) { 458156952Sume *cp++ = n; 459156952Sume net = cp; 460156952Sume while (*cp && *cp != ';' && 461156952Sume isascii(*cp) && 462156952Sume !isspace((unsigned char)*cp)) 463156952Sume cp++; 464156952Sume n = *cp; 465156952Sume *cp = 0; 466156952Sume if (inet_aton(net, &a)) { 467156952Sume statp->sort_list[nsort].mask = a.s_addr; 468156952Sume } else { 469156952Sume statp->sort_list[nsort].mask = 470156952Sume net_mask(statp->sort_list[nsort].addr); 471156952Sume } 472156952Sume } else { 473156952Sume statp->sort_list[nsort].mask = 474156952Sume net_mask(statp->sort_list[nsort].addr); 475156952Sume } 476156956Sume ext->sort_list[nsort].af = AF_INET; 477156956Sume ext->sort_list[nsort].addr.ina = 478156956Sume statp->sort_list[nsort].addr; 479156956Sume ext->sort_list[nsort].mask.ina.s_addr = 480156956Sume statp->sort_list[nsort].mask; 481156952Sume nsort++; 482156952Sume } 483156956Sume else if (inet_pton(AF_INET6, net, &a6) == 1) { 484156956Sume 485156956Sume ext->sort_list[nsort].af = AF_INET6; 486156956Sume ext->sort_list[nsort].addr.in6a = a6; 487156956Sume u = (u_char *)&ext->sort_list[nsort].mask.in6a; 488156956Sume *cp++ = n; 489156956Sume net = cp; 490156956Sume while (*cp && *cp != ';' && 491156956Sume isascii(*cp) && !isspace(*cp)) 492156956Sume cp++; 493156956Sume m = n; 494156956Sume n = *cp; 495156956Sume *cp = 0; 496156956Sume switch (m) { 497156956Sume case '/': 498156956Sume m = atoi(net); 499156956Sume break; 500156956Sume case '&': 501156956Sume if (inet_pton(AF_INET6, net, u) == 1) { 502156956Sume m = -1; 503156956Sume break; 504156956Sume } 505156956Sume /*FALLTHROUGH*/ 506156956Sume default: 507156956Sume m = sizeof(struct in6_addr) * CHAR_BIT; 508156956Sume break; 509156956Sume } 510156956Sume if (m >= 0) { 511156956Sume for (i = 0; i < sizeof(struct in6_addr); i++) { 512156956Sume if (m <= 0) { 513156956Sume *u = 0; 514156956Sume } else { 515156956Sume m -= CHAR_BIT; 516156956Sume *u = (u_char)~0; 517156956Sume if (m < 0) 518156956Sume *u <<= -m; 519156956Sume } 520156956Sume u++; 521156956Sume } 522156956Sume } 523156956Sume statp->sort_list[nsort].addr.s_addr = 524156956Sume (u_int32_t)0xffffffff; 525156956Sume statp->sort_list[nsort].mask = 526156956Sume (u_int32_t)0xffffffff; 527156956Sume nsort++; 528156956Sume } 529156952Sume *cp = n; 530156952Sume } 531156952Sume continue; 532156952Sume } 533156952Sume#endif 534156952Sume if (MATCH(buf, "options")) { 535156952Sume res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 536156952Sume continue; 537156952Sume } 538156952Sume } 539156952Sume if (nserv > 0) 540156952Sume statp->nscount = nserv; 541156952Sume#ifdef RESOLVSORT 542156952Sume statp->nsort = nsort; 543156952Sume#endif 544156952Sume (void) fclose(fp); 545156952Sume } 546156952Sume/* 547156952Sume * Last chance to get a nameserver. This should not normally 548156952Sume * be necessary 549156952Sume */ 550156952Sume#ifdef NO_RESOLV_CONF 551156952Sume if(nserv == 0) 552156952Sume nserv = get_nameservers(statp); 553156952Sume#endif 554156952Sume 555156952Sume if (statp->defdname[0] == 0 && 556156952Sume gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 557156952Sume (cp = strchr(buf, '.')) != NULL) 558156952Sume strcpy(statp->defdname, cp + 1); 559156952Sume 560156952Sume /* find components of local domain that might be searched */ 561156952Sume if (havesearch == 0) { 562156952Sume pp = statp->dnsrch; 563156952Sume *pp++ = statp->defdname; 564156952Sume *pp = NULL; 565156952Sume 566156952Sume dots = 0; 567156952Sume for (cp = statp->defdname; *cp; cp++) 568156952Sume dots += (*cp == '.'); 569156952Sume 570156952Sume cp = statp->defdname; 571156952Sume while (pp < statp->dnsrch + MAXDFLSRCH) { 572156952Sume if (dots < LOCALDOMAINPARTS) 573156952Sume break; 574170244Sume cp = strchr(cp, '.') + 1; /*%< we know there is one */ 575156952Sume *pp++ = cp; 576156952Sume dots--; 577156952Sume } 578156952Sume *pp = NULL; 579156952Sume#ifdef DEBUG 580156952Sume if (statp->options & RES_DEBUG) { 581156952Sume printf(";; res_init()... default dnsrch list:\n"); 582156952Sume for (pp = statp->dnsrch; *pp; pp++) 583156952Sume printf(";;\t%s\n", *pp); 584156952Sume printf(";;\t..END..\n"); 585156952Sume } 586156952Sume#endif 587156952Sume } 588156952Sume 589156956Sume if (issetugid()) 590156956Sume statp->options |= RES_NOALIASES; 591156956Sume else if ((cp = getenv("RES_OPTIONS")) != NULL) 592156952Sume res_setoptions(statp, cp, "env"); 593156952Sume statp->options |= RES_INIT; 594174226Sume return (statp->res_h_errno); 595156952Sume} 596156952Sume 597156952Sumestatic void 598156952Sumeres_setoptions(res_state statp, const char *options, const char *source) 599156952Sume{ 600156952Sume const char *cp = options; 601156952Sume int i; 602156956Sume#ifndef _LIBC 603156952Sume struct __res_state_ext *ext = statp->_u._ext.ext; 604156956Sume#endif 605156952Sume 606156952Sume#ifdef DEBUG 607156952Sume if (statp->options & RES_DEBUG) 608156952Sume printf(";; res_setoptions(\"%s\", \"%s\")...\n", 609156952Sume options, source); 610156952Sume#endif 611156952Sume while (*cp) { 612156952Sume /* skip leading and inner runs of spaces */ 613156952Sume while (*cp == ' ' || *cp == '\t') 614156952Sume cp++; 615156952Sume /* search for and process individual options */ 616156952Sume if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 617156952Sume i = atoi(cp + sizeof("ndots:") - 1); 618156952Sume if (i <= RES_MAXNDOTS) 619156952Sume statp->ndots = i; 620156952Sume else 621156952Sume statp->ndots = RES_MAXNDOTS; 622156952Sume#ifdef DEBUG 623156952Sume if (statp->options & RES_DEBUG) 624156952Sume printf(";;\tndots=%d\n", statp->ndots); 625156952Sume#endif 626156952Sume } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 627156952Sume i = atoi(cp + sizeof("timeout:") - 1); 628156952Sume if (i <= RES_MAXRETRANS) 629156952Sume statp->retrans = i; 630156952Sume else 631156952Sume statp->retrans = RES_MAXRETRANS; 632156952Sume#ifdef DEBUG 633156952Sume if (statp->options & RES_DEBUG) 634156952Sume printf(";;\ttimeout=%d\n", statp->retrans); 635156952Sume#endif 636156952Sume#ifdef SOLARIS2 637156952Sume } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 638156952Sume /* 639156952Sume * For backward compatibility, 'retrans' is 640156952Sume * supported as an alias for 'timeout', though 641156952Sume * without an imposed maximum. 642156952Sume */ 643156952Sume statp->retrans = atoi(cp + sizeof("retrans:") - 1); 644156952Sume } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 645156952Sume /* 646156952Sume * For backward compatibility, 'retry' is 647156952Sume * supported as an alias for 'attempts', though 648156952Sume * without an imposed maximum. 649156952Sume */ 650156952Sume statp->retry = atoi(cp + sizeof("retry:") - 1); 651156952Sume#endif /* SOLARIS2 */ 652156952Sume } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 653156952Sume i = atoi(cp + sizeof("attempts:") - 1); 654156952Sume if (i <= RES_MAXRETRY) 655156952Sume statp->retry = i; 656156952Sume else 657156952Sume statp->retry = RES_MAXRETRY; 658156952Sume#ifdef DEBUG 659156952Sume if (statp->options & RES_DEBUG) 660156952Sume printf(";;\tattempts=%d\n", statp->retry); 661156952Sume#endif 662156952Sume } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 663156952Sume#ifdef DEBUG 664156952Sume if (!(statp->options & RES_DEBUG)) { 665156952Sume printf(";; res_setoptions(\"%s\", \"%s\")..\n", 666156952Sume options, source); 667156952Sume statp->options |= RES_DEBUG; 668156952Sume } 669156952Sume printf(";;\tdebug\n"); 670156952Sume#endif 671156952Sume } else if (!strncmp(cp, "no_tld_query", 672156952Sume sizeof("no_tld_query") - 1) || 673156952Sume !strncmp(cp, "no-tld-query", 674156952Sume sizeof("no-tld-query") - 1)) { 675156952Sume statp->options |= RES_NOTLDQUERY; 676156952Sume } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 677156952Sume statp->options |= RES_USE_INET6; 678156956Sume } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 679156956Sume statp->options |= RES_INSECURE1; 680156956Sume } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 681156956Sume statp->options |= RES_INSECURE2; 682156952Sume } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 683156952Sume statp->options |= RES_ROTATE; 684156952Sume } else if (!strncmp(cp, "no-check-names", 685156952Sume sizeof("no-check-names") - 1)) { 686156952Sume statp->options |= RES_NOCHECKNAME; 687289315Svangyzen } else if (!strncmp(cp, "reload-period:", 688289315Svangyzen sizeof("reload-period:") - 1)) { 689289315Svangyzen statp->reload_period = (u_short) 690289315Svangyzen atoi(cp + sizeof("reload-period:") - 1); 691156952Sume } 692156952Sume#ifdef RES_USE_EDNS0 693156952Sume else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 694156952Sume statp->options |= RES_USE_EDNS0; 695156952Sume } 696156952Sume#endif 697156956Sume#ifndef _LIBC 698156952Sume else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 699156952Sume statp->options |= RES_USE_DNAME; 700156952Sume } 701156952Sume else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 702156952Sume if (ext == NULL) 703156952Sume goto skip; 704156952Sume cp += sizeof("nibble:") - 1; 705156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 706156952Sume strncpy(ext->nsuffix, cp, i); 707156952Sume ext->nsuffix[i] = '\0'; 708156952Sume } 709156952Sume else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 710156952Sume if (ext == NULL) 711156952Sume goto skip; 712156952Sume cp += sizeof("nibble2:") - 1; 713156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 714156952Sume strncpy(ext->nsuffix2, cp, i); 715156952Sume ext->nsuffix2[i] = '\0'; 716156952Sume } 717156952Sume else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 718156952Sume cp += sizeof("v6revmode:") - 1; 719156952Sume /* "nibble" and "bitstring" used to be valid */ 720156952Sume if (!strncmp(cp, "single", sizeof("single") - 1)) { 721156952Sume statp->options |= RES_NO_NIBBLE2; 722156952Sume } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 723156952Sume statp->options &= 724156952Sume ~RES_NO_NIBBLE2; 725156952Sume } 726156952Sume } 727156956Sume#endif 728156952Sume else { 729156952Sume /* XXX - print a warning here? */ 730156952Sume } 731156956Sume#ifndef _LIBC 732156952Sume skip: 733156956Sume#endif 734156952Sume /* skip to next run of spaces */ 735156952Sume while (*cp && *cp != ' ' && *cp != '\t') 736156952Sume cp++; 737156952Sume } 738156952Sume} 739156952Sume 740156952Sume#ifdef RESOLVSORT 741156952Sume/* XXX - should really support CIDR which means explicit masks always. */ 742156952Sumestatic u_int32_t 743288114Srodrigcnet_mask(struct in_addr in) /*!< XXX - should really use system's version of this */ 744156952Sume{ 745156956Sume u_int32_t i = ntohl(in.s_addr); 746156952Sume 747156952Sume if (IN_CLASSA(i)) 748156952Sume return (htonl(IN_CLASSA_NET)); 749156952Sume else if (IN_CLASSB(i)) 750156952Sume return (htonl(IN_CLASSB_NET)); 751156952Sume return (htonl(IN_CLASSC_NET)); 752156952Sume} 753156952Sume#endif 754156952Sume 755269867Sumestatic u_char srnd[16]; 756269867Sume 757269867Sumevoid 758269867Sumeres_rndinit(res_state statp) 759269867Sume{ 760269867Sume struct timeval now; 761269867Sume u_int32_t u32; 762269867Sume u_int16_t u16; 763269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 764269867Sume 765269867Sume gettimeofday(&now, NULL); 766269867Sume u32 = now.tv_sec; 767269867Sume memcpy(rnd, &u32, 4); 768269867Sume u32 = now.tv_usec; 769269867Sume memcpy(rnd + 4, &u32, 4); 770269867Sume u32 += now.tv_sec; 771269867Sume memcpy(rnd + 8, &u32, 4); 772269867Sume u16 = getpid(); 773269867Sume memcpy(rnd + 12, &u16, 2); 774269867Sume} 775269867Sume 776156952Sumeu_int 777269867Sumeres_nrandomid(res_state statp) { 778156952Sume struct timeval now; 779269867Sume u_int16_t u16; 780269867Sume MD5_CTX ctx; 781269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 782156952Sume 783156952Sume gettimeofday(&now, NULL); 784269867Sume u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 785269867Sume memcpy(rnd + 14, &u16, 2); 786269867Sume#ifndef HAVE_MD5 787269867Sume MD5_Init(&ctx); 788269867Sume MD5_Update(&ctx, rnd, 16); 789269867Sume MD5_Final(rnd, &ctx); 790269867Sume#else 791269867Sume MD5Init(&ctx); 792269867Sume MD5Update(&ctx, rnd, 16); 793269867Sume MD5Final(rnd, &ctx); 794269867Sume#endif 795269867Sume memcpy(&u16, rnd + 14, 2); 796269867Sume return ((u_int) u16); 797156952Sume} 798156952Sume 799170244Sume/*% 800156952Sume * This routine is for closing the socket if a virtual circuit is used and 801156952Sume * the program wants to close it. This provides support for endhostent() 802156952Sume * which expects to close the socket. 803156952Sume * 804156952Sume * This routine is not expected to be user visible. 805156952Sume */ 806156952Sumevoid 807156952Sumeres_nclose(res_state statp) { 808156952Sume int ns; 809156952Sume 810156952Sume if (statp->_vcsock >= 0) { 811160965Sume (void) _close(statp->_vcsock); 812156952Sume statp->_vcsock = -1; 813156952Sume statp->_flags &= ~(RES_F_VC | RES_F_CONN); 814156952Sume } 815156952Sume for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 816156952Sume if (statp->_u._ext.nssocks[ns] != -1) { 817160965Sume (void) _close(statp->_u._ext.nssocks[ns]); 818156952Sume statp->_u._ext.nssocks[ns] = -1; 819156952Sume } 820156952Sume } 821156952Sume} 822156952Sume 823156952Sumevoid 824156952Sumeres_ndestroy(res_state statp) { 825156952Sume res_nclose(statp); 826269867Sume if (statp->_u._ext.ext != NULL) { 827156952Sume free(statp->_u._ext.ext); 828269867Sume statp->_u._ext.ext = NULL; 829269867Sume } 830269867Sume if (statp->_rnd != NULL) { 831269867Sume free(statp->_rnd); 832269867Sume statp->_rnd = NULL; 833269867Sume } 834156952Sume statp->options &= ~RES_INIT; 835156952Sume} 836156952Sume 837156956Sume#ifndef _LIBC 838156952Sumeconst char * 839156952Sumeres_get_nibblesuffix(res_state statp) { 840156952Sume if (statp->_u._ext.ext) 841156952Sume return (statp->_u._ext.ext->nsuffix); 842156952Sume return ("ip6.arpa"); 843156952Sume} 844156952Sume 845156952Sumeconst char * 846156952Sumeres_get_nibblesuffix2(res_state statp) { 847156952Sume if (statp->_u._ext.ext) 848156952Sume return (statp->_u._ext.ext->nsuffix2); 849156952Sume return ("ip6.int"); 850156952Sume} 851156956Sume#endif 852156952Sume 853156952Sumevoid 854156952Sumeres_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 855156952Sume int i, nserv; 856156952Sume size_t size; 857156952Sume 858156952Sume /* close open servers */ 859156952Sume res_nclose(statp); 860156952Sume 861156952Sume /* cause rtt times to be forgotten */ 862156952Sume statp->_u._ext.nscount = 0; 863156952Sume 864156952Sume nserv = 0; 865156952Sume for (i = 0; i < cnt && nserv < MAXNS; i++) { 866156952Sume switch (set->sin.sin_family) { 867156952Sume case AF_INET: 868156952Sume size = sizeof(set->sin); 869156952Sume if (statp->_u._ext.ext) 870156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 871156952Sume &set->sin, size); 872156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 873156952Sume memcpy(&statp->nsaddr_list[nserv], 874156952Sume &set->sin, size); 875156952Sume else 876156952Sume statp->nsaddr_list[nserv].sin_family = 0; 877156952Sume nserv++; 878156952Sume break; 879156952Sume 880156952Sume#ifdef HAS_INET6_STRUCTS 881156952Sume case AF_INET6: 882156952Sume size = sizeof(set->sin6); 883156952Sume if (statp->_u._ext.ext) 884156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 885156952Sume &set->sin6, size); 886156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 887156952Sume memcpy(&statp->nsaddr_list[nserv], 888156952Sume &set->sin6, size); 889156952Sume else 890156952Sume statp->nsaddr_list[nserv].sin_family = 0; 891156952Sume nserv++; 892156952Sume break; 893156952Sume#endif 894156952Sume 895156952Sume default: 896156952Sume break; 897156952Sume } 898156952Sume set++; 899156952Sume } 900156952Sume statp->nscount = nserv; 901156952Sume 902156952Sume} 903156952Sume 904156952Sumeint 905156952Sumeres_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 906156952Sume int i; 907156952Sume size_t size; 908156952Sume u_int16_t family; 909156952Sume 910156952Sume for (i = 0; i < statp->nscount && i < cnt; i++) { 911156952Sume if (statp->_u._ext.ext) 912156952Sume family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 913156952Sume else 914156952Sume family = statp->nsaddr_list[i].sin_family; 915156952Sume 916156952Sume switch (family) { 917156952Sume case AF_INET: 918156952Sume size = sizeof(set->sin); 919156952Sume if (statp->_u._ext.ext) 920156952Sume memcpy(&set->sin, 921156952Sume &statp->_u._ext.ext->nsaddrs[i], 922156952Sume size); 923156952Sume else 924156952Sume memcpy(&set->sin, &statp->nsaddr_list[i], 925156952Sume size); 926156952Sume break; 927156952Sume 928156952Sume#ifdef HAS_INET6_STRUCTS 929156952Sume case AF_INET6: 930156952Sume size = sizeof(set->sin6); 931156952Sume if (statp->_u._ext.ext) 932156952Sume memcpy(&set->sin6, 933156952Sume &statp->_u._ext.ext->nsaddrs[i], 934156952Sume size); 935156952Sume else 936156952Sume memcpy(&set->sin6, &statp->nsaddr_list[i], 937156952Sume size); 938156952Sume break; 939156952Sume#endif 940156952Sume 941156952Sume default: 942156952Sume set->sin.sin_family = 0; 943156952Sume break; 944156952Sume } 945156952Sume set++; 946156952Sume } 947156952Sume return (statp->nscount); 948156952Sume} 949170244Sume 950170244Sume/*! \file */ 951