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"; 69270838Sumestatic 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: releng/10.3/lib/libc/resolv/res_init.c 292462 2015-12-19 02:41:31Z 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> 81292462Svangyzen#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 95270838Sume#ifndef HAVE_MD5 96270838Sume# include "../dst/md5.h" 97270838Sume#else 98270838Sume# ifdef SOLARIS2 99270838Sume# include <sys/md5.h> 100270838Sume# elif _LIBC 101270838Sume# include <md5.h> 102270838Sume# endif 103270838Sume#endif 104270838Sume#ifndef _MD5_H_ 105270838Sume# define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */ 106270838Sume#endif 107270838Sume 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 119292430Sngie#ifndef DEBUG 120292430Sngie#define DEBUG 121292430Sngie#endif 122156952Sume 123156952Sume#ifdef SOLARIS2 124156952Sume#include <sys/systeminfo.h> 125156952Sume#endif 126156952Sume 127156956Sumestatic void res_setoptions(res_state, const char *, const char *); 128156952Sume 129156952Sume#ifdef RESOLVSORT 130156952Sumestatic const char sort_mask[] = "/&"; 131156952Sume#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 132156956Sumestatic u_int32_t net_mask(struct in_addr); 133156952Sume#endif 134156952Sume 135170244Sume#if !defined(isascii) /*%< XXX - could be a function */ 136156952Sume# define isascii(c) (!(c & 0200)) 137156952Sume#endif 138156952Sume 139156952Sume/* 140156952Sume * Resolver state default settings. 141156952Sume */ 142156952Sume 143170244Sume/*% 144156952Sume * Set up default settings. If the configuration file exist, the values 145156952Sume * there will have precedence. Otherwise, the server address is set to 146156952Sume * INADDR_ANY and the default domain name comes from the gethostname(). 147156952Sume * 148156952Sume * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 149156952Sume * rather than INADDR_ANY ("0.0.0.0") as the default name server address 150156952Sume * since it was noted that INADDR_ANY actually meant ``the first interface 151156952Sume * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 152156952Sume * it had to be "up" in order for you to reach your own name server. It 153156952Sume * was later decided that since the recommended practice is to always 154156952Sume * install local static routes through 127.0.0.1 for all your network 155156952Sume * interfaces, that we could solve this problem without a code change. 156156952Sume * 157156952Sume * The configuration file should always be used, since it is the only way 158156952Sume * to specify a default domain. If you are running a server on your local 159156952Sume * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 160156952Sume * in the configuration file. 161156952Sume * 162156952Sume * Return 0 if completes successfully, -1 on error 163156952Sume */ 164156952Sumeint 165156952Sumeres_ninit(res_state statp) { 166156952Sume extern int __res_vinit(res_state, int); 167156952Sume 168156952Sume return (__res_vinit(statp, 0)); 169156952Sume} 170156952Sume 171170244Sume/*% This function has to be reachable by res_data.c but not publically. */ 172156952Sumeint 173156952Sume__res_vinit(res_state statp, int preinit) { 174156956Sume FILE *fp; 175156956Sume char *cp, **pp; 176156956Sume int n; 177156952Sume char buf[BUFSIZ]; 178170244Sume int nserv = 0; /*%< number of nameserver records read from file */ 179156952Sume int haveenv = 0; 180156952Sume int havesearch = 0; 181156952Sume#ifdef RESOLVSORT 182156952Sume int nsort = 0; 183156952Sume char *net; 184156952Sume#endif 185156952Sume int dots; 186156952Sume union res_sockaddr_union u[2]; 187174226Sume int maxns = MAXNS; 188156952Sume 189174226Sume RES_SET_H_ERRNO(statp, 0); 190156952Sume if (statp->_u._ext.ext != NULL) 191156952Sume res_ndestroy(statp); 192156952Sume 193156952Sume if (!preinit) { 194156952Sume statp->retrans = RES_TIMEOUT; 195156952Sume statp->retry = RES_DFLRETRY; 196156952Sume statp->options = RES_DEFAULT; 197156952Sume } 198156952Sume 199270838Sume statp->_rnd = malloc(16); 200270838Sume res_rndinit(statp); 201270838Sume statp->id = res_nrandomid(statp); 202270838Sume 203156952Sume memset(u, 0, sizeof(u)); 204156952Sume#ifdef USELOOPBACK 205156952Sume u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 206156952Sume#else 207156952Sume u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 208156952Sume#endif 209156952Sume u[nserv].sin.sin_family = AF_INET; 210156952Sume u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 211156952Sume#ifdef HAVE_SA_LEN 212156952Sume u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 213156952Sume#endif 214156952Sume nserv++; 215156952Sume#ifdef HAS_INET6_STRUCTS 216156952Sume#ifdef USELOOPBACK 217156952Sume u[nserv].sin6.sin6_addr = in6addr_loopback; 218156952Sume#else 219156952Sume u[nserv].sin6.sin6_addr = in6addr_any; 220156952Sume#endif 221156952Sume u[nserv].sin6.sin6_family = AF_INET6; 222156952Sume u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 223156952Sume#ifdef HAVE_SA_LEN 224156952Sume u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 225156952Sume#endif 226156952Sume nserv++; 227156952Sume#endif 228156952Sume statp->nscount = 0; 229156952Sume statp->ndots = 1; 230156952Sume statp->pfcode = 0; 231156952Sume statp->_vcsock = -1; 232156952Sume statp->_flags = 0; 233156952Sume statp->qhook = NULL; 234156952Sume statp->rhook = NULL; 235156952Sume statp->_u._ext.nscount = 0; 236156952Sume statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 237156952Sume if (statp->_u._ext.ext != NULL) { 238156952Sume memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 239156952Sume statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 240156952Sume strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 241156952Sume strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 242292462Svangyzen statp->_u._ext.ext->reload_period = 2; 243174226Sume } else { 244174226Sume /* 245174226Sume * Historically res_init() rarely, if at all, failed. 246174226Sume * Examples and applications exist which do not check 247174226Sume * our return code. Furthermore several applications 248174226Sume * simply call us to get the systems domainname. So 249174226Sume * rather then immediately fail here we store the 250174226Sume * failure, which is returned later, in h_errno. And 251174226Sume * prevent the collection of 'nameserver' information 252174226Sume * by setting maxns to 0. Thus applications that fail 253174226Sume * to check our return code wont be able to make 254174226Sume * queries anyhow. 255174226Sume */ 256174226Sume RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 257174226Sume maxns = 0; 258174226Sume } 259156952Sume#ifdef RESOLVSORT 260156952Sume statp->nsort = 0; 261156952Sume#endif 262156952Sume res_setservers(statp, u, nserv); 263156952Sume 264156952Sume#ifdef SOLARIS2 265156952Sume /* 266156952Sume * The old libresolv derived the defaultdomain from NIS/NIS+. 267156952Sume * We want to keep this behaviour 268156952Sume */ 269156952Sume { 270156952Sume char buf[sizeof(statp->defdname)], *cp; 271156952Sume int ret; 272156952Sume 273156952Sume if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 274156952Sume (unsigned int)ret <= sizeof(buf)) { 275156952Sume if (buf[0] == '+') 276156952Sume buf[0] = '.'; 277156952Sume cp = strchr(buf, '.'); 278165258Sume cp = (cp == NULL) ? buf : (cp + 1); 279174226Sume strncpy(statp->defdname, cp, 280174226Sume sizeof(statp->defdname) - 1); 281174226Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 282156952Sume } 283156952Sume } 284156952Sume#endif /* SOLARIS2 */ 285156952Sume 286156952Sume /* Allow user to override the local domain definition */ 287156956Sume if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 288156952Sume (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 289156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 290156952Sume haveenv++; 291156952Sume 292156952Sume /* 293156952Sume * Set search list to be blank-separated strings 294156952Sume * from rest of env value. Permits users of LOCALDOMAIN 295156952Sume * to still have a search list, and anyone to set the 296156952Sume * one that they want to use as an individual (even more 297156952Sume * important now that the rfc1535 stuff restricts searches) 298156952Sume */ 299156952Sume cp = statp->defdname; 300156952Sume pp = statp->dnsrch; 301156952Sume *pp++ = cp; 302156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 303170244Sume if (*cp == '\n') /*%< silly backwards compat */ 304156952Sume break; 305156952Sume else if (*cp == ' ' || *cp == '\t') { 306156952Sume *cp = 0; 307156952Sume n = 1; 308156952Sume } else if (n) { 309156952Sume *pp++ = cp; 310156952Sume n = 0; 311156952Sume havesearch = 1; 312156952Sume } 313156952Sume } 314156952Sume /* null terminate last domain if there are excess */ 315156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 316156952Sume cp++; 317156952Sume *cp = '\0'; 318156952Sume *pp++ = 0; 319156952Sume } 320156952Sume 321156952Sume#define MATCH(line, name) \ 322156952Sume (!strncmp(line, name, sizeof(name) - 1) && \ 323156952Sume (line[sizeof(name) - 1] == ' ' || \ 324156952Sume line[sizeof(name) - 1] == '\t')) 325156952Sume 326156952Sume nserv = 0; 327254700Sjilles if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 328292462Svangyzen struct stat sb; 329292462Svangyzen struct timespec now; 330292462Svangyzen 331292462Svangyzen if (statp->_u._ext.ext != NULL) { 332292462Svangyzen if (_fstat(fileno(fp), &sb) == 0) { 333292462Svangyzen statp->_u._ext.ext->conf_mtim = sb.st_mtim; 334292462Svangyzen if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) { 335292462Svangyzen statp->_u._ext.ext->conf_stat = now.tv_sec; 336292462Svangyzen } 337292462Svangyzen } 338292462Svangyzen } 339292462Svangyzen 340156952Sume /* read the config file */ 341156952Sume while (fgets(buf, sizeof(buf), fp) != NULL) { 342156952Sume /* skip comments */ 343156952Sume if (*buf == ';' || *buf == '#') 344156952Sume continue; 345156952Sume /* read default domain name */ 346156952Sume if (MATCH(buf, "domain")) { 347170244Sume if (haveenv) /*%< skip if have from environ */ 348156952Sume continue; 349156952Sume cp = buf + sizeof("domain") - 1; 350156952Sume while (*cp == ' ' || *cp == '\t') 351156952Sume cp++; 352156952Sume if ((*cp == '\0') || (*cp == '\n')) 353156952Sume continue; 354156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 355156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 356156952Sume if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 357156952Sume *cp = '\0'; 358156952Sume havesearch = 0; 359156952Sume continue; 360156952Sume } 361156952Sume /* set search list */ 362156952Sume if (MATCH(buf, "search")) { 363170244Sume if (haveenv) /*%< skip if have from environ */ 364156952Sume continue; 365156952Sume cp = buf + sizeof("search") - 1; 366156952Sume while (*cp == ' ' || *cp == '\t') 367156952Sume cp++; 368156952Sume if ((*cp == '\0') || (*cp == '\n')) 369156952Sume continue; 370156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 371156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 372156952Sume if ((cp = strchr(statp->defdname, '\n')) != NULL) 373156952Sume *cp = '\0'; 374156952Sume /* 375156952Sume * Set search list to be blank-separated strings 376156952Sume * on rest of line. 377156952Sume */ 378156952Sume cp = statp->defdname; 379156952Sume pp = statp->dnsrch; 380156952Sume *pp++ = cp; 381156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 382156952Sume if (*cp == ' ' || *cp == '\t') { 383156952Sume *cp = 0; 384156952Sume n = 1; 385156952Sume } else if (n) { 386156952Sume *pp++ = cp; 387156952Sume n = 0; 388156952Sume } 389156952Sume } 390156952Sume /* null terminate last domain if there are excess */ 391156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t') 392156952Sume cp++; 393156952Sume *cp = '\0'; 394156952Sume *pp++ = 0; 395156952Sume havesearch = 1; 396156952Sume continue; 397156952Sume } 398156952Sume /* read nameservers to query */ 399174226Sume if (MATCH(buf, "nameserver") && nserv < maxns) { 400156952Sume struct addrinfo hints, *ai; 401156952Sume char sbuf[NI_MAXSERV]; 402156952Sume const size_t minsiz = 403156952Sume sizeof(statp->_u._ext.ext->nsaddrs[0]); 404156952Sume 405156952Sume cp = buf + sizeof("nameserver") - 1; 406156952Sume while (*cp == ' ' || *cp == '\t') 407156952Sume cp++; 408156952Sume cp[strcspn(cp, ";# \t\n")] = '\0'; 409156952Sume if ((*cp != '\0') && (*cp != '\n')) { 410156952Sume memset(&hints, 0, sizeof(hints)); 411156952Sume hints.ai_family = PF_UNSPEC; 412156952Sume hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 413156952Sume hints.ai_flags = AI_NUMERICHOST; 414156952Sume sprintf(sbuf, "%u", NAMESERVER_PORT); 415156952Sume if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 416156952Sume ai->ai_addrlen <= minsiz) { 417156952Sume if (statp->_u._ext.ext != NULL) { 418156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 419156952Sume ai->ai_addr, ai->ai_addrlen); 420156952Sume } 421156952Sume if (ai->ai_addrlen <= 422156952Sume sizeof(statp->nsaddr_list[nserv])) { 423156952Sume memcpy(&statp->nsaddr_list[nserv], 424156952Sume ai->ai_addr, ai->ai_addrlen); 425156952Sume } else 426156952Sume statp->nsaddr_list[nserv].sin_family = 0; 427156952Sume freeaddrinfo(ai); 428156952Sume nserv++; 429156952Sume } 430156952Sume } 431156952Sume continue; 432156952Sume } 433156952Sume#ifdef RESOLVSORT 434156952Sume if (MATCH(buf, "sortlist")) { 435156952Sume struct in_addr a; 436156956Sume struct in6_addr a6; 437156956Sume int m, i; 438156956Sume u_char *u; 439156956Sume struct __res_state_ext *ext = statp->_u._ext.ext; 440156952Sume 441156952Sume cp = buf + sizeof("sortlist") - 1; 442156952Sume while (nsort < MAXRESOLVSORT) { 443156952Sume while (*cp == ' ' || *cp == '\t') 444156952Sume cp++; 445156952Sume if (*cp == '\0' || *cp == '\n' || *cp == ';') 446156952Sume break; 447156952Sume net = cp; 448156952Sume while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 449156952Sume isascii(*cp) && !isspace((unsigned char)*cp)) 450156952Sume cp++; 451156952Sume n = *cp; 452156952Sume *cp = 0; 453156952Sume if (inet_aton(net, &a)) { 454156952Sume statp->sort_list[nsort].addr = a; 455156952Sume if (ISSORTMASK(n)) { 456156952Sume *cp++ = n; 457156952Sume net = cp; 458156952Sume while (*cp && *cp != ';' && 459156952Sume isascii(*cp) && 460156952Sume !isspace((unsigned char)*cp)) 461156952Sume cp++; 462156952Sume n = *cp; 463156952Sume *cp = 0; 464156952Sume if (inet_aton(net, &a)) { 465156952Sume statp->sort_list[nsort].mask = a.s_addr; 466156952Sume } else { 467156952Sume statp->sort_list[nsort].mask = 468156952Sume net_mask(statp->sort_list[nsort].addr); 469156952Sume } 470156952Sume } else { 471156952Sume statp->sort_list[nsort].mask = 472156952Sume net_mask(statp->sort_list[nsort].addr); 473156952Sume } 474156956Sume ext->sort_list[nsort].af = AF_INET; 475156956Sume ext->sort_list[nsort].addr.ina = 476156956Sume statp->sort_list[nsort].addr; 477156956Sume ext->sort_list[nsort].mask.ina.s_addr = 478156956Sume statp->sort_list[nsort].mask; 479156952Sume nsort++; 480156952Sume } 481156956Sume else if (inet_pton(AF_INET6, net, &a6) == 1) { 482156956Sume 483156956Sume ext->sort_list[nsort].af = AF_INET6; 484156956Sume ext->sort_list[nsort].addr.in6a = a6; 485156956Sume u = (u_char *)&ext->sort_list[nsort].mask.in6a; 486156956Sume *cp++ = n; 487156956Sume net = cp; 488156956Sume while (*cp && *cp != ';' && 489156956Sume isascii(*cp) && !isspace(*cp)) 490156956Sume cp++; 491156956Sume m = n; 492156956Sume n = *cp; 493156956Sume *cp = 0; 494156956Sume switch (m) { 495156956Sume case '/': 496156956Sume m = atoi(net); 497156956Sume break; 498156956Sume case '&': 499156956Sume if (inet_pton(AF_INET6, net, u) == 1) { 500156956Sume m = -1; 501156956Sume break; 502156956Sume } 503156956Sume /*FALLTHROUGH*/ 504156956Sume default: 505156956Sume m = sizeof(struct in6_addr) * CHAR_BIT; 506156956Sume break; 507156956Sume } 508156956Sume if (m >= 0) { 509156956Sume for (i = 0; i < sizeof(struct in6_addr); i++) { 510156956Sume if (m <= 0) { 511156956Sume *u = 0; 512156956Sume } else { 513156956Sume m -= CHAR_BIT; 514156956Sume *u = (u_char)~0; 515156956Sume if (m < 0) 516156956Sume *u <<= -m; 517156956Sume } 518156956Sume u++; 519156956Sume } 520156956Sume } 521156956Sume statp->sort_list[nsort].addr.s_addr = 522156956Sume (u_int32_t)0xffffffff; 523156956Sume statp->sort_list[nsort].mask = 524156956Sume (u_int32_t)0xffffffff; 525156956Sume nsort++; 526156956Sume } 527156952Sume *cp = n; 528156952Sume } 529156952Sume continue; 530156952Sume } 531156952Sume#endif 532156952Sume if (MATCH(buf, "options")) { 533156952Sume res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 534156952Sume continue; 535156952Sume } 536156952Sume } 537156952Sume if (nserv > 0) 538156952Sume statp->nscount = nserv; 539156952Sume#ifdef RESOLVSORT 540156952Sume statp->nsort = nsort; 541156952Sume#endif 542156952Sume (void) fclose(fp); 543156952Sume } 544156952Sume/* 545156952Sume * Last chance to get a nameserver. This should not normally 546156952Sume * be necessary 547156952Sume */ 548156952Sume#ifdef NO_RESOLV_CONF 549156952Sume if(nserv == 0) 550156952Sume nserv = get_nameservers(statp); 551156952Sume#endif 552156952Sume 553156952Sume if (statp->defdname[0] == 0 && 554156952Sume gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 555156952Sume (cp = strchr(buf, '.')) != NULL) 556156952Sume strcpy(statp->defdname, cp + 1); 557156952Sume 558156952Sume /* find components of local domain that might be searched */ 559156952Sume if (havesearch == 0) { 560156952Sume pp = statp->dnsrch; 561156952Sume *pp++ = statp->defdname; 562156952Sume *pp = NULL; 563156952Sume 564156952Sume dots = 0; 565156952Sume for (cp = statp->defdname; *cp; cp++) 566156952Sume dots += (*cp == '.'); 567156952Sume 568156952Sume cp = statp->defdname; 569156952Sume while (pp < statp->dnsrch + MAXDFLSRCH) { 570156952Sume if (dots < LOCALDOMAINPARTS) 571156952Sume break; 572170244Sume cp = strchr(cp, '.') + 1; /*%< we know there is one */ 573156952Sume *pp++ = cp; 574156952Sume dots--; 575156952Sume } 576156952Sume *pp = NULL; 577156952Sume#ifdef DEBUG 578156952Sume if (statp->options & RES_DEBUG) { 579156952Sume printf(";; res_init()... default dnsrch list:\n"); 580156952Sume for (pp = statp->dnsrch; *pp; pp++) 581156952Sume printf(";;\t%s\n", *pp); 582156952Sume printf(";;\t..END..\n"); 583156952Sume } 584156952Sume#endif 585156952Sume } 586156952Sume 587156956Sume if (issetugid()) 588156956Sume statp->options |= RES_NOALIASES; 589156956Sume else if ((cp = getenv("RES_OPTIONS")) != NULL) 590156952Sume res_setoptions(statp, cp, "env"); 591156952Sume statp->options |= RES_INIT; 592174226Sume return (statp->res_h_errno); 593156952Sume} 594156952Sume 595156952Sumestatic void 596156952Sumeres_setoptions(res_state statp, const char *options, const char *source) 597156952Sume{ 598156952Sume const char *cp = options; 599156952Sume int i; 600156952Sume struct __res_state_ext *ext = statp->_u._ext.ext; 601156952Sume 602156952Sume#ifdef DEBUG 603156952Sume if (statp->options & RES_DEBUG) 604156952Sume printf(";; res_setoptions(\"%s\", \"%s\")...\n", 605156952Sume options, source); 606156952Sume#endif 607156952Sume while (*cp) { 608156952Sume /* skip leading and inner runs of spaces */ 609156952Sume while (*cp == ' ' || *cp == '\t') 610156952Sume cp++; 611156952Sume /* search for and process individual options */ 612156952Sume if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 613156952Sume i = atoi(cp + sizeof("ndots:") - 1); 614156952Sume if (i <= RES_MAXNDOTS) 615156952Sume statp->ndots = i; 616156952Sume else 617156952Sume statp->ndots = RES_MAXNDOTS; 618156952Sume#ifdef DEBUG 619156952Sume if (statp->options & RES_DEBUG) 620156952Sume printf(";;\tndots=%d\n", statp->ndots); 621156952Sume#endif 622156952Sume } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 623156952Sume i = atoi(cp + sizeof("timeout:") - 1); 624156952Sume if (i <= RES_MAXRETRANS) 625156952Sume statp->retrans = i; 626156952Sume else 627156952Sume statp->retrans = RES_MAXRETRANS; 628156952Sume#ifdef DEBUG 629156952Sume if (statp->options & RES_DEBUG) 630156952Sume printf(";;\ttimeout=%d\n", statp->retrans); 631156952Sume#endif 632156952Sume#ifdef SOLARIS2 633156952Sume } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 634156952Sume /* 635156952Sume * For backward compatibility, 'retrans' is 636156952Sume * supported as an alias for 'timeout', though 637156952Sume * without an imposed maximum. 638156952Sume */ 639156952Sume statp->retrans = atoi(cp + sizeof("retrans:") - 1); 640156952Sume } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 641156952Sume /* 642156952Sume * For backward compatibility, 'retry' is 643156952Sume * supported as an alias for 'attempts', though 644156952Sume * without an imposed maximum. 645156952Sume */ 646156952Sume statp->retry = atoi(cp + sizeof("retry:") - 1); 647156952Sume#endif /* SOLARIS2 */ 648156952Sume } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 649156952Sume i = atoi(cp + sizeof("attempts:") - 1); 650156952Sume if (i <= RES_MAXRETRY) 651156952Sume statp->retry = i; 652156952Sume else 653156952Sume statp->retry = RES_MAXRETRY; 654156952Sume#ifdef DEBUG 655156952Sume if (statp->options & RES_DEBUG) 656156952Sume printf(";;\tattempts=%d\n", statp->retry); 657156952Sume#endif 658156952Sume } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 659156952Sume#ifdef DEBUG 660156952Sume if (!(statp->options & RES_DEBUG)) { 661156952Sume printf(";; res_setoptions(\"%s\", \"%s\")..\n", 662156952Sume options, source); 663156952Sume statp->options |= RES_DEBUG; 664156952Sume } 665156952Sume printf(";;\tdebug\n"); 666156952Sume#endif 667156952Sume } else if (!strncmp(cp, "no_tld_query", 668156952Sume sizeof("no_tld_query") - 1) || 669156952Sume !strncmp(cp, "no-tld-query", 670156952Sume sizeof("no-tld-query") - 1)) { 671156952Sume statp->options |= RES_NOTLDQUERY; 672156952Sume } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 673156952Sume statp->options |= RES_USE_INET6; 674156956Sume } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 675156956Sume statp->options |= RES_INSECURE1; 676156956Sume } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 677156956Sume statp->options |= RES_INSECURE2; 678156952Sume } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 679156952Sume statp->options |= RES_ROTATE; 680156952Sume } else if (!strncmp(cp, "no-check-names", 681156952Sume sizeof("no-check-names") - 1)) { 682156952Sume statp->options |= RES_NOCHECKNAME; 683292462Svangyzen } else if (!strncmp(cp, "reload-period:", 684292462Svangyzen sizeof("reload-period:") - 1)) { 685292462Svangyzen if (ext != NULL) { 686292462Svangyzen ext->reload_period = (u_short) 687292462Svangyzen atoi(cp + sizeof("reload-period:") - 1); 688292462Svangyzen } 689156952Sume } 690156952Sume#ifdef RES_USE_EDNS0 691156952Sume else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 692156952Sume statp->options |= RES_USE_EDNS0; 693156952Sume } 694156952Sume#endif 695156956Sume#ifndef _LIBC 696156952Sume else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 697156952Sume statp->options |= RES_USE_DNAME; 698156952Sume } 699156952Sume else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 700156952Sume if (ext == NULL) 701156952Sume goto skip; 702156952Sume cp += sizeof("nibble:") - 1; 703156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 704156952Sume strncpy(ext->nsuffix, cp, i); 705156952Sume ext->nsuffix[i] = '\0'; 706156952Sume } 707156952Sume else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 708156952Sume if (ext == NULL) 709156952Sume goto skip; 710156952Sume cp += sizeof("nibble2:") - 1; 711156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 712156952Sume strncpy(ext->nsuffix2, cp, i); 713156952Sume ext->nsuffix2[i] = '\0'; 714156952Sume } 715156952Sume else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 716156952Sume cp += sizeof("v6revmode:") - 1; 717156952Sume /* "nibble" and "bitstring" used to be valid */ 718156952Sume if (!strncmp(cp, "single", sizeof("single") - 1)) { 719156952Sume statp->options |= RES_NO_NIBBLE2; 720156952Sume } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 721156952Sume statp->options &= 722156952Sume ~RES_NO_NIBBLE2; 723156952Sume } 724156952Sume } 725156956Sume#endif 726156952Sume else { 727156952Sume /* XXX - print a warning here? */ 728156952Sume } 729156956Sume#ifndef _LIBC 730156952Sume skip: 731156956Sume#endif 732156952Sume /* skip to next run of spaces */ 733156952Sume while (*cp && *cp != ' ' && *cp != '\t') 734156952Sume cp++; 735156952Sume } 736156952Sume} 737156952Sume 738156952Sume#ifdef RESOLVSORT 739156952Sume/* XXX - should really support CIDR which means explicit masks always. */ 740156952Sumestatic u_int32_t 741170244Sumenet_mask(in) /*!< XXX - should really use system's version of this */ 742156952Sume struct in_addr in; 743156952Sume{ 744156956Sume u_int32_t i = ntohl(in.s_addr); 745156952Sume 746156952Sume if (IN_CLASSA(i)) 747156952Sume return (htonl(IN_CLASSA_NET)); 748156952Sume else if (IN_CLASSB(i)) 749156952Sume return (htonl(IN_CLASSB_NET)); 750156952Sume return (htonl(IN_CLASSC_NET)); 751156952Sume} 752156952Sume#endif 753156952Sume 754270838Sumestatic u_char srnd[16]; 755270838Sume 756270838Sumevoid 757270838Sumeres_rndinit(res_state statp) 758270838Sume{ 759270838Sume struct timeval now; 760270838Sume u_int32_t u32; 761270838Sume u_int16_t u16; 762270838Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 763270838Sume 764270838Sume gettimeofday(&now, NULL); 765270838Sume u32 = now.tv_sec; 766270838Sume memcpy(rnd, &u32, 4); 767270838Sume u32 = now.tv_usec; 768270838Sume memcpy(rnd + 4, &u32, 4); 769270838Sume u32 += now.tv_sec; 770270838Sume memcpy(rnd + 8, &u32, 4); 771270838Sume u16 = getpid(); 772270838Sume memcpy(rnd + 12, &u16, 2); 773270838Sume} 774270838Sume 775156952Sumeu_int 776270838Sumeres_nrandomid(res_state statp) { 777156952Sume struct timeval now; 778270838Sume u_int16_t u16; 779270838Sume MD5_CTX ctx; 780270838Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 781156952Sume 782156952Sume gettimeofday(&now, NULL); 783270838Sume u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 784270838Sume memcpy(rnd + 14, &u16, 2); 785270838Sume#ifndef HAVE_MD5 786270838Sume MD5_Init(&ctx); 787270838Sume MD5_Update(&ctx, rnd, 16); 788270838Sume MD5_Final(rnd, &ctx); 789270838Sume#else 790270838Sume MD5Init(&ctx); 791270838Sume MD5Update(&ctx, rnd, 16); 792270838Sume MD5Final(rnd, &ctx); 793270838Sume#endif 794270838Sume memcpy(&u16, rnd + 14, 2); 795270838Sume return ((u_int) u16); 796156952Sume} 797156952Sume 798170244Sume/*% 799156952Sume * This routine is for closing the socket if a virtual circuit is used and 800156952Sume * the program wants to close it. This provides support for endhostent() 801156952Sume * which expects to close the socket. 802156952Sume * 803156952Sume * This routine is not expected to be user visible. 804156952Sume */ 805156952Sumevoid 806156952Sumeres_nclose(res_state statp) { 807156952Sume int ns; 808156952Sume 809156952Sume if (statp->_vcsock >= 0) { 810160965Sume (void) _close(statp->_vcsock); 811156952Sume statp->_vcsock = -1; 812156952Sume statp->_flags &= ~(RES_F_VC | RES_F_CONN); 813156952Sume } 814156952Sume for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 815156952Sume if (statp->_u._ext.nssocks[ns] != -1) { 816160965Sume (void) _close(statp->_u._ext.nssocks[ns]); 817156952Sume statp->_u._ext.nssocks[ns] = -1; 818156952Sume } 819156952Sume } 820156952Sume} 821156952Sume 822156952Sumevoid 823156952Sumeres_ndestroy(res_state statp) { 824156952Sume res_nclose(statp); 825270838Sume if (statp->_u._ext.ext != NULL) { 826156952Sume free(statp->_u._ext.ext); 827270838Sume statp->_u._ext.ext = NULL; 828270838Sume } 829270838Sume if (statp->_rnd != NULL) { 830270838Sume free(statp->_rnd); 831270838Sume statp->_rnd = NULL; 832270838Sume } 833156952Sume statp->options &= ~RES_INIT; 834156952Sume} 835156952Sume 836156956Sume#ifndef _LIBC 837156952Sumeconst char * 838156952Sumeres_get_nibblesuffix(res_state statp) { 839156952Sume if (statp->_u._ext.ext) 840156952Sume return (statp->_u._ext.ext->nsuffix); 841156952Sume return ("ip6.arpa"); 842156952Sume} 843156952Sume 844156952Sumeconst char * 845156952Sumeres_get_nibblesuffix2(res_state statp) { 846156952Sume if (statp->_u._ext.ext) 847156952Sume return (statp->_u._ext.ext->nsuffix2); 848156952Sume return ("ip6.int"); 849156952Sume} 850156956Sume#endif 851156952Sume 852156952Sumevoid 853156952Sumeres_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 854156952Sume int i, nserv; 855156952Sume size_t size; 856156952Sume 857156952Sume /* close open servers */ 858156952Sume res_nclose(statp); 859156952Sume 860156952Sume /* cause rtt times to be forgotten */ 861156952Sume statp->_u._ext.nscount = 0; 862156952Sume 863156952Sume nserv = 0; 864156952Sume for (i = 0; i < cnt && nserv < MAXNS; i++) { 865156952Sume switch (set->sin.sin_family) { 866156952Sume case AF_INET: 867156952Sume size = sizeof(set->sin); 868156952Sume if (statp->_u._ext.ext) 869156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 870156952Sume &set->sin, size); 871156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 872156952Sume memcpy(&statp->nsaddr_list[nserv], 873156952Sume &set->sin, size); 874156952Sume else 875156952Sume statp->nsaddr_list[nserv].sin_family = 0; 876156952Sume nserv++; 877156952Sume break; 878156952Sume 879156952Sume#ifdef HAS_INET6_STRUCTS 880156952Sume case AF_INET6: 881156952Sume size = sizeof(set->sin6); 882156952Sume if (statp->_u._ext.ext) 883156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 884156952Sume &set->sin6, size); 885156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 886156952Sume memcpy(&statp->nsaddr_list[nserv], 887156952Sume &set->sin6, size); 888156952Sume else 889156952Sume statp->nsaddr_list[nserv].sin_family = 0; 890156952Sume nserv++; 891156952Sume break; 892156952Sume#endif 893156952Sume 894156952Sume default: 895156952Sume break; 896156952Sume } 897156952Sume set++; 898156952Sume } 899156952Sume statp->nscount = nserv; 900156952Sume 901156952Sume} 902156952Sume 903156952Sumeint 904156952Sumeres_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 905156952Sume int i; 906156952Sume size_t size; 907156952Sume u_int16_t family; 908156952Sume 909156952Sume for (i = 0; i < statp->nscount && i < cnt; i++) { 910156952Sume if (statp->_u._ext.ext) 911156952Sume family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 912156952Sume else 913156952Sume family = statp->nsaddr_list[i].sin_family; 914156952Sume 915156952Sume switch (family) { 916156952Sume case AF_INET: 917156952Sume size = sizeof(set->sin); 918156952Sume if (statp->_u._ext.ext) 919156952Sume memcpy(&set->sin, 920156952Sume &statp->_u._ext.ext->nsaddrs[i], 921156952Sume size); 922156952Sume else 923156952Sume memcpy(&set->sin, &statp->nsaddr_list[i], 924156952Sume size); 925156952Sume break; 926156952Sume 927156952Sume#ifdef HAS_INET6_STRUCTS 928156952Sume case AF_INET6: 929156952Sume size = sizeof(set->sin6); 930156952Sume if (statp->_u._ext.ext) 931156952Sume memcpy(&set->sin6, 932156952Sume &statp->_u._ext.ext->nsaddrs[i], 933156952Sume size); 934156952Sume else 935156952Sume memcpy(&set->sin6, &statp->nsaddr_list[i], 936156952Sume size); 937156952Sume break; 938156952Sume#endif 939156952Sume 940156952Sume default: 941156952Sume set->sin.sin_family = 0; 942156952Sume break; 943156952Sume } 944156952Sume set++; 945156952Sume } 946156952Sume return (statp->nscount); 947156952Sume} 948170244Sume 949170244Sume/*! \file */ 950