res_init.c revision 269867
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 269867 2014-08-12 12:36:06Z ume $"); 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> 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 118156952Sume#define DEBUG 119156952Sume 120156952Sume#ifdef SOLARIS2 121156952Sume#include <sys/systeminfo.h> 122156952Sume#endif 123156952Sume 124156956Sumestatic void res_setoptions(res_state, const char *, const char *); 125156952Sume 126156952Sume#ifdef RESOLVSORT 127156952Sumestatic const char sort_mask[] = "/&"; 128156952Sume#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) 129156956Sumestatic u_int32_t net_mask(struct in_addr); 130156952Sume#endif 131156952Sume 132170244Sume#if !defined(isascii) /*%< XXX - could be a function */ 133156952Sume# define isascii(c) (!(c & 0200)) 134156952Sume#endif 135156952Sume 136156952Sume/* 137156952Sume * Resolver state default settings. 138156952Sume */ 139156952Sume 140170244Sume/*% 141156952Sume * Set up default settings. If the configuration file exist, the values 142156952Sume * there will have precedence. Otherwise, the server address is set to 143156952Sume * INADDR_ANY and the default domain name comes from the gethostname(). 144156952Sume * 145156952Sume * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 146156952Sume * rather than INADDR_ANY ("0.0.0.0") as the default name server address 147156952Sume * since it was noted that INADDR_ANY actually meant ``the first interface 148156952Sume * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, 149156952Sume * it had to be "up" in order for you to reach your own name server. It 150156952Sume * was later decided that since the recommended practice is to always 151156952Sume * install local static routes through 127.0.0.1 for all your network 152156952Sume * interfaces, that we could solve this problem without a code change. 153156952Sume * 154156952Sume * The configuration file should always be used, since it is the only way 155156952Sume * to specify a default domain. If you are running a server on your local 156156952Sume * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" 157156952Sume * in the configuration file. 158156952Sume * 159156952Sume * Return 0 if completes successfully, -1 on error 160156952Sume */ 161156952Sumeint 162156952Sumeres_ninit(res_state statp) { 163156952Sume extern int __res_vinit(res_state, int); 164156952Sume 165156952Sume return (__res_vinit(statp, 0)); 166156952Sume} 167156952Sume 168170244Sume/*% This function has to be reachable by res_data.c but not publically. */ 169156952Sumeint 170156952Sume__res_vinit(res_state statp, int preinit) { 171156956Sume FILE *fp; 172156956Sume char *cp, **pp; 173156956Sume int n; 174156952Sume char buf[BUFSIZ]; 175170244Sume int nserv = 0; /*%< number of nameserver records read from file */ 176156952Sume int haveenv = 0; 177156952Sume int havesearch = 0; 178156952Sume#ifdef RESOLVSORT 179156952Sume int nsort = 0; 180156952Sume char *net; 181156952Sume#endif 182156952Sume int dots; 183156952Sume union res_sockaddr_union u[2]; 184174226Sume int maxns = MAXNS; 185156952Sume 186174226Sume RES_SET_H_ERRNO(statp, 0); 187156952Sume if (statp->_u._ext.ext != NULL) 188156952Sume res_ndestroy(statp); 189156952Sume 190156952Sume if (!preinit) { 191156952Sume statp->retrans = RES_TIMEOUT; 192156952Sume statp->retry = RES_DFLRETRY; 193156952Sume statp->options = RES_DEFAULT; 194156952Sume } 195156952Sume 196269867Sume statp->_rnd = malloc(16); 197269867Sume res_rndinit(statp); 198269867Sume statp->id = res_nrandomid(statp); 199269867Sume 200156952Sume memset(u, 0, sizeof(u)); 201156952Sume#ifdef USELOOPBACK 202156952Sume u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); 203156952Sume#else 204156952Sume u[nserv].sin.sin_addr.s_addr = INADDR_ANY; 205156952Sume#endif 206156952Sume u[nserv].sin.sin_family = AF_INET; 207156952Sume u[nserv].sin.sin_port = htons(NAMESERVER_PORT); 208156952Sume#ifdef HAVE_SA_LEN 209156952Sume u[nserv].sin.sin_len = sizeof(struct sockaddr_in); 210156952Sume#endif 211156952Sume nserv++; 212156952Sume#ifdef HAS_INET6_STRUCTS 213156952Sume#ifdef USELOOPBACK 214156952Sume u[nserv].sin6.sin6_addr = in6addr_loopback; 215156952Sume#else 216156952Sume u[nserv].sin6.sin6_addr = in6addr_any; 217156952Sume#endif 218156952Sume u[nserv].sin6.sin6_family = AF_INET6; 219156952Sume u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); 220156952Sume#ifdef HAVE_SA_LEN 221156952Sume u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); 222156952Sume#endif 223156952Sume nserv++; 224156952Sume#endif 225156952Sume statp->nscount = 0; 226156952Sume statp->ndots = 1; 227156952Sume statp->pfcode = 0; 228156952Sume statp->_vcsock = -1; 229156952Sume statp->_flags = 0; 230156952Sume statp->qhook = NULL; 231156952Sume statp->rhook = NULL; 232156952Sume statp->_u._ext.nscount = 0; 233156952Sume statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); 234156952Sume if (statp->_u._ext.ext != NULL) { 235156952Sume memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); 236156952Sume statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; 237156952Sume strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); 238156952Sume strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); 239174226Sume } else { 240174226Sume /* 241174226Sume * Historically res_init() rarely, if at all, failed. 242174226Sume * Examples and applications exist which do not check 243174226Sume * our return code. Furthermore several applications 244174226Sume * simply call us to get the systems domainname. So 245174226Sume * rather then immediately fail here we store the 246174226Sume * failure, which is returned later, in h_errno. And 247174226Sume * prevent the collection of 'nameserver' information 248174226Sume * by setting maxns to 0. Thus applications that fail 249174226Sume * to check our return code wont be able to make 250174226Sume * queries anyhow. 251174226Sume */ 252174226Sume RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 253174226Sume maxns = 0; 254174226Sume } 255156952Sume#ifdef RESOLVSORT 256156952Sume statp->nsort = 0; 257156952Sume#endif 258156952Sume res_setservers(statp, u, nserv); 259156952Sume 260156952Sume#ifdef SOLARIS2 261156952Sume /* 262156952Sume * The old libresolv derived the defaultdomain from NIS/NIS+. 263156952Sume * We want to keep this behaviour 264156952Sume */ 265156952Sume { 266156952Sume char buf[sizeof(statp->defdname)], *cp; 267156952Sume int ret; 268156952Sume 269156952Sume if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 && 270156952Sume (unsigned int)ret <= sizeof(buf)) { 271156952Sume if (buf[0] == '+') 272156952Sume buf[0] = '.'; 273156952Sume cp = strchr(buf, '.'); 274165258Sume cp = (cp == NULL) ? buf : (cp + 1); 275174226Sume strncpy(statp->defdname, cp, 276174226Sume sizeof(statp->defdname) - 1); 277174226Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 278156952Sume } 279156952Sume } 280156952Sume#endif /* SOLARIS2 */ 281156952Sume 282156952Sume /* Allow user to override the local domain definition */ 283156956Sume if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) { 284156952Sume (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 285156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 286156952Sume haveenv++; 287156952Sume 288156952Sume /* 289156952Sume * Set search list to be blank-separated strings 290156952Sume * from rest of env value. Permits users of LOCALDOMAIN 291156952Sume * to still have a search list, and anyone to set the 292156952Sume * one that they want to use as an individual (even more 293156952Sume * important now that the rfc1535 stuff restricts searches) 294156952Sume */ 295156952Sume cp = statp->defdname; 296156952Sume pp = statp->dnsrch; 297156952Sume *pp++ = cp; 298156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 299170244Sume if (*cp == '\n') /*%< silly backwards compat */ 300156952Sume break; 301156952Sume else if (*cp == ' ' || *cp == '\t') { 302156952Sume *cp = 0; 303156952Sume n = 1; 304156952Sume } else if (n) { 305156952Sume *pp++ = cp; 306156952Sume n = 0; 307156952Sume havesearch = 1; 308156952Sume } 309156952Sume } 310156952Sume /* null terminate last domain if there are excess */ 311156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') 312156952Sume cp++; 313156952Sume *cp = '\0'; 314156952Sume *pp++ = 0; 315156952Sume } 316156952Sume 317156952Sume#define MATCH(line, name) \ 318156952Sume (!strncmp(line, name, sizeof(name) - 1) && \ 319156952Sume (line[sizeof(name) - 1] == ' ' || \ 320156952Sume line[sizeof(name) - 1] == '\t')) 321156952Sume 322156952Sume nserv = 0; 323254700Sjilles if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) { 324156952Sume /* read the config file */ 325156952Sume while (fgets(buf, sizeof(buf), fp) != NULL) { 326156952Sume /* skip comments */ 327156952Sume if (*buf == ';' || *buf == '#') 328156952Sume continue; 329156952Sume /* read default domain name */ 330156952Sume if (MATCH(buf, "domain")) { 331170244Sume if (haveenv) /*%< skip if have from environ */ 332156952Sume continue; 333156952Sume cp = buf + sizeof("domain") - 1; 334156952Sume while (*cp == ' ' || *cp == '\t') 335156952Sume cp++; 336156952Sume if ((*cp == '\0') || (*cp == '\n')) 337156952Sume continue; 338156952Sume strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); 339156952Sume statp->defdname[sizeof(statp->defdname) - 1] = '\0'; 340156952Sume if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL) 341156952Sume *cp = '\0'; 342156952Sume havesearch = 0; 343156952Sume continue; 344156952Sume } 345156952Sume /* set search list */ 346156952Sume if (MATCH(buf, "search")) { 347170244Sume if (haveenv) /*%< skip if have from environ */ 348156952Sume continue; 349156952Sume cp = buf + sizeof("search") - 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 = strchr(statp->defdname, '\n')) != NULL) 357156952Sume *cp = '\0'; 358156952Sume /* 359156952Sume * Set search list to be blank-separated strings 360156952Sume * on rest of line. 361156952Sume */ 362156952Sume cp = statp->defdname; 363156952Sume pp = statp->dnsrch; 364156952Sume *pp++ = cp; 365156952Sume for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { 366156952Sume if (*cp == ' ' || *cp == '\t') { 367156952Sume *cp = 0; 368156952Sume n = 1; 369156952Sume } else if (n) { 370156952Sume *pp++ = cp; 371156952Sume n = 0; 372156952Sume } 373156952Sume } 374156952Sume /* null terminate last domain if there are excess */ 375156952Sume while (*cp != '\0' && *cp != ' ' && *cp != '\t') 376156952Sume cp++; 377156952Sume *cp = '\0'; 378156952Sume *pp++ = 0; 379156952Sume havesearch = 1; 380156952Sume continue; 381156952Sume } 382156952Sume /* read nameservers to query */ 383174226Sume if (MATCH(buf, "nameserver") && nserv < maxns) { 384156952Sume struct addrinfo hints, *ai; 385156952Sume char sbuf[NI_MAXSERV]; 386156952Sume const size_t minsiz = 387156952Sume sizeof(statp->_u._ext.ext->nsaddrs[0]); 388156952Sume 389156952Sume cp = buf + sizeof("nameserver") - 1; 390156952Sume while (*cp == ' ' || *cp == '\t') 391156952Sume cp++; 392156952Sume cp[strcspn(cp, ";# \t\n")] = '\0'; 393156952Sume if ((*cp != '\0') && (*cp != '\n')) { 394156952Sume memset(&hints, 0, sizeof(hints)); 395156952Sume hints.ai_family = PF_UNSPEC; 396156952Sume hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 397156952Sume hints.ai_flags = AI_NUMERICHOST; 398156952Sume sprintf(sbuf, "%u", NAMESERVER_PORT); 399156952Sume if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 && 400156952Sume ai->ai_addrlen <= minsiz) { 401156952Sume if (statp->_u._ext.ext != NULL) { 402156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 403156952Sume ai->ai_addr, ai->ai_addrlen); 404156952Sume } 405156952Sume if (ai->ai_addrlen <= 406156952Sume sizeof(statp->nsaddr_list[nserv])) { 407156952Sume memcpy(&statp->nsaddr_list[nserv], 408156952Sume ai->ai_addr, ai->ai_addrlen); 409156952Sume } else 410156952Sume statp->nsaddr_list[nserv].sin_family = 0; 411156952Sume freeaddrinfo(ai); 412156952Sume nserv++; 413156952Sume } 414156952Sume } 415156952Sume continue; 416156952Sume } 417156952Sume#ifdef RESOLVSORT 418156952Sume if (MATCH(buf, "sortlist")) { 419156952Sume struct in_addr a; 420156956Sume struct in6_addr a6; 421156956Sume int m, i; 422156956Sume u_char *u; 423156956Sume struct __res_state_ext *ext = statp->_u._ext.ext; 424156952Sume 425156952Sume cp = buf + sizeof("sortlist") - 1; 426156952Sume while (nsort < MAXRESOLVSORT) { 427156952Sume while (*cp == ' ' || *cp == '\t') 428156952Sume cp++; 429156952Sume if (*cp == '\0' || *cp == '\n' || *cp == ';') 430156952Sume break; 431156952Sume net = cp; 432156952Sume while (*cp && !ISSORTMASK(*cp) && *cp != ';' && 433156952Sume isascii(*cp) && !isspace((unsigned char)*cp)) 434156952Sume cp++; 435156952Sume n = *cp; 436156952Sume *cp = 0; 437156952Sume if (inet_aton(net, &a)) { 438156952Sume statp->sort_list[nsort].addr = a; 439156952Sume if (ISSORTMASK(n)) { 440156952Sume *cp++ = n; 441156952Sume net = cp; 442156952Sume while (*cp && *cp != ';' && 443156952Sume isascii(*cp) && 444156952Sume !isspace((unsigned char)*cp)) 445156952Sume cp++; 446156952Sume n = *cp; 447156952Sume *cp = 0; 448156952Sume if (inet_aton(net, &a)) { 449156952Sume statp->sort_list[nsort].mask = a.s_addr; 450156952Sume } else { 451156952Sume statp->sort_list[nsort].mask = 452156952Sume net_mask(statp->sort_list[nsort].addr); 453156952Sume } 454156952Sume } else { 455156952Sume statp->sort_list[nsort].mask = 456156952Sume net_mask(statp->sort_list[nsort].addr); 457156952Sume } 458156956Sume ext->sort_list[nsort].af = AF_INET; 459156956Sume ext->sort_list[nsort].addr.ina = 460156956Sume statp->sort_list[nsort].addr; 461156956Sume ext->sort_list[nsort].mask.ina.s_addr = 462156956Sume statp->sort_list[nsort].mask; 463156952Sume nsort++; 464156952Sume } 465156956Sume else if (inet_pton(AF_INET6, net, &a6) == 1) { 466156956Sume 467156956Sume ext->sort_list[nsort].af = AF_INET6; 468156956Sume ext->sort_list[nsort].addr.in6a = a6; 469156956Sume u = (u_char *)&ext->sort_list[nsort].mask.in6a; 470156956Sume *cp++ = n; 471156956Sume net = cp; 472156956Sume while (*cp && *cp != ';' && 473156956Sume isascii(*cp) && !isspace(*cp)) 474156956Sume cp++; 475156956Sume m = n; 476156956Sume n = *cp; 477156956Sume *cp = 0; 478156956Sume switch (m) { 479156956Sume case '/': 480156956Sume m = atoi(net); 481156956Sume break; 482156956Sume case '&': 483156956Sume if (inet_pton(AF_INET6, net, u) == 1) { 484156956Sume m = -1; 485156956Sume break; 486156956Sume } 487156956Sume /*FALLTHROUGH*/ 488156956Sume default: 489156956Sume m = sizeof(struct in6_addr) * CHAR_BIT; 490156956Sume break; 491156956Sume } 492156956Sume if (m >= 0) { 493156956Sume for (i = 0; i < sizeof(struct in6_addr); i++) { 494156956Sume if (m <= 0) { 495156956Sume *u = 0; 496156956Sume } else { 497156956Sume m -= CHAR_BIT; 498156956Sume *u = (u_char)~0; 499156956Sume if (m < 0) 500156956Sume *u <<= -m; 501156956Sume } 502156956Sume u++; 503156956Sume } 504156956Sume } 505156956Sume statp->sort_list[nsort].addr.s_addr = 506156956Sume (u_int32_t)0xffffffff; 507156956Sume statp->sort_list[nsort].mask = 508156956Sume (u_int32_t)0xffffffff; 509156956Sume nsort++; 510156956Sume } 511156952Sume *cp = n; 512156952Sume } 513156952Sume continue; 514156952Sume } 515156952Sume#endif 516156952Sume if (MATCH(buf, "options")) { 517156952Sume res_setoptions(statp, buf + sizeof("options") - 1, "conf"); 518156952Sume continue; 519156952Sume } 520156952Sume } 521156952Sume if (nserv > 0) 522156952Sume statp->nscount = nserv; 523156952Sume#ifdef RESOLVSORT 524156952Sume statp->nsort = nsort; 525156952Sume#endif 526156952Sume (void) fclose(fp); 527156952Sume } 528156952Sume/* 529156952Sume * Last chance to get a nameserver. This should not normally 530156952Sume * be necessary 531156952Sume */ 532156952Sume#ifdef NO_RESOLV_CONF 533156952Sume if(nserv == 0) 534156952Sume nserv = get_nameservers(statp); 535156952Sume#endif 536156952Sume 537156952Sume if (statp->defdname[0] == 0 && 538156952Sume gethostname(buf, sizeof(statp->defdname) - 1) == 0 && 539156952Sume (cp = strchr(buf, '.')) != NULL) 540156952Sume strcpy(statp->defdname, cp + 1); 541156952Sume 542156952Sume /* find components of local domain that might be searched */ 543156952Sume if (havesearch == 0) { 544156952Sume pp = statp->dnsrch; 545156952Sume *pp++ = statp->defdname; 546156952Sume *pp = NULL; 547156952Sume 548156952Sume dots = 0; 549156952Sume for (cp = statp->defdname; *cp; cp++) 550156952Sume dots += (*cp == '.'); 551156952Sume 552156952Sume cp = statp->defdname; 553156952Sume while (pp < statp->dnsrch + MAXDFLSRCH) { 554156952Sume if (dots < LOCALDOMAINPARTS) 555156952Sume break; 556170244Sume cp = strchr(cp, '.') + 1; /*%< we know there is one */ 557156952Sume *pp++ = cp; 558156952Sume dots--; 559156952Sume } 560156952Sume *pp = NULL; 561156952Sume#ifdef DEBUG 562156952Sume if (statp->options & RES_DEBUG) { 563156952Sume printf(";; res_init()... default dnsrch list:\n"); 564156952Sume for (pp = statp->dnsrch; *pp; pp++) 565156952Sume printf(";;\t%s\n", *pp); 566156952Sume printf(";;\t..END..\n"); 567156952Sume } 568156952Sume#endif 569156952Sume } 570156952Sume 571156956Sume if (issetugid()) 572156956Sume statp->options |= RES_NOALIASES; 573156956Sume else if ((cp = getenv("RES_OPTIONS")) != NULL) 574156952Sume res_setoptions(statp, cp, "env"); 575156952Sume statp->options |= RES_INIT; 576174226Sume return (statp->res_h_errno); 577156952Sume} 578156952Sume 579156952Sumestatic void 580156952Sumeres_setoptions(res_state statp, const char *options, const char *source) 581156952Sume{ 582156952Sume const char *cp = options; 583156952Sume int i; 584156956Sume#ifndef _LIBC 585156952Sume struct __res_state_ext *ext = statp->_u._ext.ext; 586156956Sume#endif 587156952Sume 588156952Sume#ifdef DEBUG 589156952Sume if (statp->options & RES_DEBUG) 590156952Sume printf(";; res_setoptions(\"%s\", \"%s\")...\n", 591156952Sume options, source); 592156952Sume#endif 593156952Sume while (*cp) { 594156952Sume /* skip leading and inner runs of spaces */ 595156952Sume while (*cp == ' ' || *cp == '\t') 596156952Sume cp++; 597156952Sume /* search for and process individual options */ 598156952Sume if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { 599156952Sume i = atoi(cp + sizeof("ndots:") - 1); 600156952Sume if (i <= RES_MAXNDOTS) 601156952Sume statp->ndots = i; 602156952Sume else 603156952Sume statp->ndots = RES_MAXNDOTS; 604156952Sume#ifdef DEBUG 605156952Sume if (statp->options & RES_DEBUG) 606156952Sume printf(";;\tndots=%d\n", statp->ndots); 607156952Sume#endif 608156952Sume } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { 609156952Sume i = atoi(cp + sizeof("timeout:") - 1); 610156952Sume if (i <= RES_MAXRETRANS) 611156952Sume statp->retrans = i; 612156952Sume else 613156952Sume statp->retrans = RES_MAXRETRANS; 614156952Sume#ifdef DEBUG 615156952Sume if (statp->options & RES_DEBUG) 616156952Sume printf(";;\ttimeout=%d\n", statp->retrans); 617156952Sume#endif 618156952Sume#ifdef SOLARIS2 619156952Sume } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) { 620156952Sume /* 621156952Sume * For backward compatibility, 'retrans' is 622156952Sume * supported as an alias for 'timeout', though 623156952Sume * without an imposed maximum. 624156952Sume */ 625156952Sume statp->retrans = atoi(cp + sizeof("retrans:") - 1); 626156952Sume } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){ 627156952Sume /* 628156952Sume * For backward compatibility, 'retry' is 629156952Sume * supported as an alias for 'attempts', though 630156952Sume * without an imposed maximum. 631156952Sume */ 632156952Sume statp->retry = atoi(cp + sizeof("retry:") - 1); 633156952Sume#endif /* SOLARIS2 */ 634156952Sume } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ 635156952Sume i = atoi(cp + sizeof("attempts:") - 1); 636156952Sume if (i <= RES_MAXRETRY) 637156952Sume statp->retry = i; 638156952Sume else 639156952Sume statp->retry = RES_MAXRETRY; 640156952Sume#ifdef DEBUG 641156952Sume if (statp->options & RES_DEBUG) 642156952Sume printf(";;\tattempts=%d\n", statp->retry); 643156952Sume#endif 644156952Sume } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { 645156952Sume#ifdef DEBUG 646156952Sume if (!(statp->options & RES_DEBUG)) { 647156952Sume printf(";; res_setoptions(\"%s\", \"%s\")..\n", 648156952Sume options, source); 649156952Sume statp->options |= RES_DEBUG; 650156952Sume } 651156952Sume printf(";;\tdebug\n"); 652156952Sume#endif 653156952Sume } else if (!strncmp(cp, "no_tld_query", 654156952Sume sizeof("no_tld_query") - 1) || 655156952Sume !strncmp(cp, "no-tld-query", 656156952Sume sizeof("no-tld-query") - 1)) { 657156952Sume statp->options |= RES_NOTLDQUERY; 658156952Sume } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { 659156952Sume statp->options |= RES_USE_INET6; 660156956Sume } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) { 661156956Sume statp->options |= RES_INSECURE1; 662156956Sume } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) { 663156956Sume statp->options |= RES_INSECURE2; 664156952Sume } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { 665156952Sume statp->options |= RES_ROTATE; 666156952Sume } else if (!strncmp(cp, "no-check-names", 667156952Sume sizeof("no-check-names") - 1)) { 668156952Sume statp->options |= RES_NOCHECKNAME; 669156952Sume } 670156952Sume#ifdef RES_USE_EDNS0 671156952Sume else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { 672156952Sume statp->options |= RES_USE_EDNS0; 673156952Sume } 674156952Sume#endif 675156956Sume#ifndef _LIBC 676156952Sume else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { 677156952Sume statp->options |= RES_USE_DNAME; 678156952Sume } 679156952Sume else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { 680156952Sume if (ext == NULL) 681156952Sume goto skip; 682156952Sume cp += sizeof("nibble:") - 1; 683156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); 684156952Sume strncpy(ext->nsuffix, cp, i); 685156952Sume ext->nsuffix[i] = '\0'; 686156952Sume } 687156952Sume else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { 688156952Sume if (ext == NULL) 689156952Sume goto skip; 690156952Sume cp += sizeof("nibble2:") - 1; 691156952Sume i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); 692156952Sume strncpy(ext->nsuffix2, cp, i); 693156952Sume ext->nsuffix2[i] = '\0'; 694156952Sume } 695156952Sume else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { 696156952Sume cp += sizeof("v6revmode:") - 1; 697156952Sume /* "nibble" and "bitstring" used to be valid */ 698156952Sume if (!strncmp(cp, "single", sizeof("single") - 1)) { 699156952Sume statp->options |= RES_NO_NIBBLE2; 700156952Sume } else if (!strncmp(cp, "both", sizeof("both") - 1)) { 701156952Sume statp->options &= 702156952Sume ~RES_NO_NIBBLE2; 703156952Sume } 704156952Sume } 705156956Sume#endif 706156952Sume else { 707156952Sume /* XXX - print a warning here? */ 708156952Sume } 709156956Sume#ifndef _LIBC 710156952Sume skip: 711156956Sume#endif 712156952Sume /* skip to next run of spaces */ 713156952Sume while (*cp && *cp != ' ' && *cp != '\t') 714156952Sume cp++; 715156952Sume } 716156952Sume} 717156952Sume 718156952Sume#ifdef RESOLVSORT 719156952Sume/* XXX - should really support CIDR which means explicit masks always. */ 720156952Sumestatic u_int32_t 721170244Sumenet_mask(in) /*!< XXX - should really use system's version of this */ 722156952Sume struct in_addr in; 723156952Sume{ 724156956Sume u_int32_t i = ntohl(in.s_addr); 725156952Sume 726156952Sume if (IN_CLASSA(i)) 727156952Sume return (htonl(IN_CLASSA_NET)); 728156952Sume else if (IN_CLASSB(i)) 729156952Sume return (htonl(IN_CLASSB_NET)); 730156952Sume return (htonl(IN_CLASSC_NET)); 731156952Sume} 732156952Sume#endif 733156952Sume 734269867Sumestatic u_char srnd[16]; 735269867Sume 736269867Sumevoid 737269867Sumeres_rndinit(res_state statp) 738269867Sume{ 739269867Sume struct timeval now; 740269867Sume u_int32_t u32; 741269867Sume u_int16_t u16; 742269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 743269867Sume 744269867Sume gettimeofday(&now, NULL); 745269867Sume u32 = now.tv_sec; 746269867Sume memcpy(rnd, &u32, 4); 747269867Sume u32 = now.tv_usec; 748269867Sume memcpy(rnd + 4, &u32, 4); 749269867Sume u32 += now.tv_sec; 750269867Sume memcpy(rnd + 8, &u32, 4); 751269867Sume u16 = getpid(); 752269867Sume memcpy(rnd + 12, &u16, 2); 753269867Sume} 754269867Sume 755156952Sumeu_int 756269867Sumeres_nrandomid(res_state statp) { 757156952Sume struct timeval now; 758269867Sume u_int16_t u16; 759269867Sume MD5_CTX ctx; 760269867Sume u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd; 761156952Sume 762156952Sume gettimeofday(&now, NULL); 763269867Sume u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec); 764269867Sume memcpy(rnd + 14, &u16, 2); 765269867Sume#ifndef HAVE_MD5 766269867Sume MD5_Init(&ctx); 767269867Sume MD5_Update(&ctx, rnd, 16); 768269867Sume MD5_Final(rnd, &ctx); 769269867Sume#else 770269867Sume MD5Init(&ctx); 771269867Sume MD5Update(&ctx, rnd, 16); 772269867Sume MD5Final(rnd, &ctx); 773269867Sume#endif 774269867Sume memcpy(&u16, rnd + 14, 2); 775269867Sume return ((u_int) u16); 776156952Sume} 777156952Sume 778170244Sume/*% 779156952Sume * This routine is for closing the socket if a virtual circuit is used and 780156952Sume * the program wants to close it. This provides support for endhostent() 781156952Sume * which expects to close the socket. 782156952Sume * 783156952Sume * This routine is not expected to be user visible. 784156952Sume */ 785156952Sumevoid 786156952Sumeres_nclose(res_state statp) { 787156952Sume int ns; 788156952Sume 789156952Sume if (statp->_vcsock >= 0) { 790160965Sume (void) _close(statp->_vcsock); 791156952Sume statp->_vcsock = -1; 792156952Sume statp->_flags &= ~(RES_F_VC | RES_F_CONN); 793156952Sume } 794156952Sume for (ns = 0; ns < statp->_u._ext.nscount; ns++) { 795156952Sume if (statp->_u._ext.nssocks[ns] != -1) { 796160965Sume (void) _close(statp->_u._ext.nssocks[ns]); 797156952Sume statp->_u._ext.nssocks[ns] = -1; 798156952Sume } 799156952Sume } 800156952Sume} 801156952Sume 802156952Sumevoid 803156952Sumeres_ndestroy(res_state statp) { 804156952Sume res_nclose(statp); 805269867Sume if (statp->_u._ext.ext != NULL) { 806156952Sume free(statp->_u._ext.ext); 807269867Sume statp->_u._ext.ext = NULL; 808269867Sume } 809269867Sume if (statp->_rnd != NULL) { 810269867Sume free(statp->_rnd); 811269867Sume statp->_rnd = NULL; 812269867Sume } 813156952Sume statp->options &= ~RES_INIT; 814156952Sume} 815156952Sume 816156956Sume#ifndef _LIBC 817156952Sumeconst char * 818156952Sumeres_get_nibblesuffix(res_state statp) { 819156952Sume if (statp->_u._ext.ext) 820156952Sume return (statp->_u._ext.ext->nsuffix); 821156952Sume return ("ip6.arpa"); 822156952Sume} 823156952Sume 824156952Sumeconst char * 825156952Sumeres_get_nibblesuffix2(res_state statp) { 826156952Sume if (statp->_u._ext.ext) 827156952Sume return (statp->_u._ext.ext->nsuffix2); 828156952Sume return ("ip6.int"); 829156952Sume} 830156956Sume#endif 831156952Sume 832156952Sumevoid 833156952Sumeres_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) { 834156952Sume int i, nserv; 835156952Sume size_t size; 836156952Sume 837156952Sume /* close open servers */ 838156952Sume res_nclose(statp); 839156952Sume 840156952Sume /* cause rtt times to be forgotten */ 841156952Sume statp->_u._ext.nscount = 0; 842156952Sume 843156952Sume nserv = 0; 844156952Sume for (i = 0; i < cnt && nserv < MAXNS; i++) { 845156952Sume switch (set->sin.sin_family) { 846156952Sume case AF_INET: 847156952Sume size = sizeof(set->sin); 848156952Sume if (statp->_u._ext.ext) 849156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 850156952Sume &set->sin, size); 851156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 852156952Sume memcpy(&statp->nsaddr_list[nserv], 853156952Sume &set->sin, size); 854156952Sume else 855156952Sume statp->nsaddr_list[nserv].sin_family = 0; 856156952Sume nserv++; 857156952Sume break; 858156952Sume 859156952Sume#ifdef HAS_INET6_STRUCTS 860156952Sume case AF_INET6: 861156952Sume size = sizeof(set->sin6); 862156952Sume if (statp->_u._ext.ext) 863156952Sume memcpy(&statp->_u._ext.ext->nsaddrs[nserv], 864156952Sume &set->sin6, size); 865156952Sume if (size <= sizeof(statp->nsaddr_list[nserv])) 866156952Sume memcpy(&statp->nsaddr_list[nserv], 867156952Sume &set->sin6, size); 868156952Sume else 869156952Sume statp->nsaddr_list[nserv].sin_family = 0; 870156952Sume nserv++; 871156952Sume break; 872156952Sume#endif 873156952Sume 874156952Sume default: 875156952Sume break; 876156952Sume } 877156952Sume set++; 878156952Sume } 879156952Sume statp->nscount = nserv; 880156952Sume 881156952Sume} 882156952Sume 883156952Sumeint 884156952Sumeres_getservers(res_state statp, union res_sockaddr_union *set, int cnt) { 885156952Sume int i; 886156952Sume size_t size; 887156952Sume u_int16_t family; 888156952Sume 889156952Sume for (i = 0; i < statp->nscount && i < cnt; i++) { 890156952Sume if (statp->_u._ext.ext) 891156952Sume family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; 892156952Sume else 893156952Sume family = statp->nsaddr_list[i].sin_family; 894156952Sume 895156952Sume switch (family) { 896156952Sume case AF_INET: 897156952Sume size = sizeof(set->sin); 898156952Sume if (statp->_u._ext.ext) 899156952Sume memcpy(&set->sin, 900156952Sume &statp->_u._ext.ext->nsaddrs[i], 901156952Sume size); 902156952Sume else 903156952Sume memcpy(&set->sin, &statp->nsaddr_list[i], 904156952Sume size); 905156952Sume break; 906156952Sume 907156952Sume#ifdef HAS_INET6_STRUCTS 908156952Sume case AF_INET6: 909156952Sume size = sizeof(set->sin6); 910156952Sume if (statp->_u._ext.ext) 911156952Sume memcpy(&set->sin6, 912156952Sume &statp->_u._ext.ext->nsaddrs[i], 913156952Sume size); 914156952Sume else 915156952Sume memcpy(&set->sin6, &statp->nsaddr_list[i], 916156952Sume size); 917156952Sume break; 918156952Sume#endif 919156952Sume 920156952Sume default: 921156952Sume set->sin.sin_family = 0; 922156952Sume break; 923156952Sume } 924156952Sume set++; 925156952Sume } 926156952Sume return (statp->nscount); 927156952Sume} 928170244Sume 929170244Sume/*! \file */ 930