[BACK]Return to res_init.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / lib / libc / resolv

Annotation of src/lib/libc/resolv/res_init.c, Revision 1.28

1.28    ! christos    1: /*     $NetBSD: res_init.c,v 1.27 2013/12/09 09:35:16 wiz Exp $        */
1.1       christos    2:
                      3: /*
                      4:  * Copyright (c) 1985, 1989, 1993
                      5:  *    The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: /*
                     37:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
                     38:  *
                     39:  * Permission to use, copy, modify, and distribute this software for any
                     40:  * purpose with or without fee is hereby granted, provided that the above
                     41:  * copyright notice and this permission notice appear in all copies, and that
                     42:  * the name of Digital Equipment Corporation not be used in advertising or
                     43:  * publicity pertaining to distribution of the document or software without
                     44:  * specific, written prior permission.
                     45:  *
                     46:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     47:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     48:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     49:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     50:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     51:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     52:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     53:  * SOFTWARE.
                     54:  */
                     55:
                     56: /*
                     57:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                     58:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     59:  *
                     60:  * Permission to use, copy, modify, and distribute this software for any
                     61:  * purpose with or without fee is hereby granted, provided that the above
                     62:  * copyright notice and this permission notice appear in all copies.
                     63:  *
                     64:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     65:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     66:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     67:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     68:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     69:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     70:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     71:  */
                     72:
1.3       christos   73: #include <sys/cdefs.h>
1.1       christos   74: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   75: #ifdef notdef
1.1       christos   76: static const char sccsid[] = "@(#)res_init.c   8.1 (Berkeley) 6/7/93";
1.17      christos   77: static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp";
1.3       christos   78: #else
1.28    ! christos   79: __RCSID("$NetBSD: res_init.c,v 1.27 2013/12/09 09:35:16 wiz Exp $");
1.3       christos   80: #endif
1.1       christos   81: #endif /* LIBC_SCCS and not lint */
                     82:
                     83: #include "port_before.h"
                     84:
1.4       christos   85: #include "namespace.h"
1.1       christos   86: #include <sys/types.h>
                     87: #include <sys/param.h>
                     88: #include <sys/socket.h>
1.21      christos   89: #include <sys/stat.h>
1.1       christos   90: #include <sys/time.h>
1.21      christos   91: #include <sys/event.h>
1.1       christos   92:
                     93: #include <netinet/in.h>
                     94: #include <arpa/inet.h>
                     95: #include <arpa/nameser.h>
                     96:
                     97: #include <ctype.h>
                     98: #include <stdio.h>
                     99: #include <stdlib.h>
                    100: #include <string.h>
                    101: #include <unistd.h>
1.21      christos  102: #include <fcntl.h>
1.1       christos  103: #include <netdb.h>
                    104:
1.17      christos  105: #define HAVE_MD5
                    106: #include <md5.h>
                    107:
                    108: #ifndef HAVE_MD5
                    109: # include "../dst/md5.h"
                    110: #else
                    111: # ifdef SOLARIS2
                    112: #  include <sys/md5.h>
                    113: # endif
                    114: #endif
                    115: #ifndef _MD5_H_
                    116: # define _MD5_H_ 1     /*%< make sure we do not include rsaref md5.h file */
                    117: #endif
                    118:
1.1       christos  119: #include "port_after.h"
                    120:
1.5       christos  121: #if 0
1.4       christos  122: #ifdef __weak_alias
                    123: __weak_alias(res_ninit,_res_ninit)
                    124: __weak_alias(res_randomid,__res_randomid)
                    125: __weak_alias(res_nclose,_res_nclose)
                    126: __weak_alias(res_ndestroy,_res_ndestroy)
                    127: __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
                    128: __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
                    129: __weak_alias(res_getservers,__res_getservers)
                    130: __weak_alias(res_setservers,__res_setservers)
                    131: #endif
1.5       christos  132: #endif
1.4       christos  133:
                    134:
1.1       christos  135: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
                    136: #include <resolv.h>
                    137:
                    138: #include "res_private.h"
                    139:
1.15      christos  140: #define RESOLVSORT
1.9       christos  141: /*% Options.  Should all be left alone. */
1.7       christos  142: #ifndef DEBUG
1.1       christos  143: #define DEBUG
1.7       christos  144: #endif
1.1       christos  145:
1.9       christos  146: #ifdef SOLARIS2
                    147: #include <sys/systeminfo.h>
                    148: #endif
                    149:
1.25      matt      150: static void res_setoptions(res_state, const char *, const char *);
1.1       christos  151:
1.14      christos  152: #ifdef RESOLVSORT
1.1       christos  153: static const char sort_mask[] = "/&";
                    154: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
1.25      matt      155: static uint32_t net_mask(struct in_addr);
1.14      christos  156: #endif
1.1       christos  157:
1.9       christos  158: #if !defined(isascii)  /*%< XXX - could be a function */
1.1       christos  159: # define isascii(c) (!(c & 0200))
                    160: #endif
                    161:
1.21      christos  162: static struct timespec __res_conf_time;
                    163: static const struct timespec ts = { 0, 0 };
                    164:
1.28    ! christos  165: const char *__res_conf_name = _PATH_RESCONF;
        !           166:
1.1       christos  167: /*
                    168:  * Resolver state default settings.
                    169:  */
                    170:
1.9       christos  171: /*%
1.1       christos  172:  * Set up default settings.  If the configuration file exist, the values
                    173:  * there will have precedence.  Otherwise, the server address is set to
                    174:  * INADDR_ANY and the default domain name comes from the gethostname().
                    175:  *
                    176:  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
                    177:  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
                    178:  * since it was noted that INADDR_ANY actually meant ``the first interface
                    179:  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
                    180:  * it had to be "up" in order for you to reach your own name server.  It
                    181:  * was later decided that since the recommended practice is to always
                    182:  * install local static routes through 127.0.0.1 for all your network
                    183:  * interfaces, that we could solve this problem without a code change.
                    184:  *
                    185:  * The configuration file should always be used, since it is the only way
                    186:  * to specify a default domain.  If you are running a server on your local
                    187:  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
                    188:  * in the configuration file.
                    189:  *
                    190:  * Return 0 if completes successfully, -1 on error
                    191:  */
                    192: int
                    193: res_ninit(res_state statp) {
                    194:        return (__res_vinit(statp, 0));
                    195: }
                    196:
1.9       christos  197: /*% This function has to be reachable by res_data.c but not publically. */
1.1       christos  198: int
                    199: __res_vinit(res_state statp, int preinit) {
                    200:        register FILE *fp;
                    201:        register char *cp, **pp;
                    202:        register int n;
                    203:        char buf[BUFSIZ];
1.9       christos  204:        int nserv = 0;    /*%< number of nameserver records read from file */
1.1       christos  205:        int haveenv = 0;
                    206:        int havesearch = 0;
1.14      christos  207: #ifdef RESOLVSORT
1.1       christos  208:        int nsort = 0;
                    209:        char *net;
1.14      christos  210: #endif
1.1       christos  211:        int dots;
                    212:        union res_sockaddr_union u[2];
1.14      christos  213:        int maxns = MAXNS;
                    214:
                    215:        RES_SET_H_ERRNO(statp, 0);
                    216:
1.21      christos  217:        if ((statp->options & RES_INIT) != 0U)
                    218:                res_ndestroy(statp);
                    219:
1.1       christos  220:        if (!preinit) {
                    221:                statp->retrans = RES_TIMEOUT;
                    222:                statp->retry = RES_DFLRETRY;
                    223:                statp->options = RES_DEFAULT;
                    224:        }
1.21      christos  225:        statp->_rnd = malloc(16);
                    226:        res_rndinit(statp);
                    227:        statp->id = res_nrandomid(statp);
1.12      christos  228:
1.1       christos  229:        memset(u, 0, sizeof(u));
                    230: #ifdef USELOOPBACK
                    231:        u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
                    232: #else
                    233:        u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
                    234: #endif
                    235:        u[nserv].sin.sin_family = AF_INET;
                    236:        u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
                    237: #ifdef HAVE_SA_LEN
                    238:        u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
                    239: #endif
                    240:        nserv++;
                    241: #ifdef HAS_INET6_STRUCTS
                    242: #ifdef USELOOPBACK
                    243:        u[nserv].sin6.sin6_addr = in6addr_loopback;
                    244: #else
                    245:        u[nserv].sin6.sin6_addr = in6addr_any;
                    246: #endif
                    247:        u[nserv].sin6.sin6_family = AF_INET6;
                    248:        u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
                    249: #ifdef HAVE_SA_LEN
                    250:        u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
                    251: #endif
                    252:        nserv++;
                    253: #endif
                    254:        statp->nscount = 0;
                    255:        statp->ndots = 1;
                    256:        statp->pfcode = 0;
                    257:        statp->_vcsock = -1;
                    258:        statp->_flags = 0;
                    259:        statp->qhook = NULL;
                    260:        statp->rhook = NULL;
                    261:        statp->_u._ext.nscount = 0;
                    262:        statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
                    263:        if (statp->_u._ext.ext != NULL) {
                    264:                memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
                    265:                statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
                    266:                strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
                    267:                strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14      christos  268:        } else {
                    269:                /*
                    270:                 * Historically res_init() rarely, if at all, failed.
                    271:                 * Examples and applications exist which do not check
                    272:                 * our return code.  Furthermore several applications
                    273:                 * simply call us to get the systems domainname.  So
1.27      wiz       274:                 * rather than immediately fail here we store the
1.14      christos  275:                 * failure, which is returned later, in h_errno.  And
                    276:                 * prevent the collection of 'nameserver' information
                    277:                 * by setting maxns to 0.  Thus applications that fail
                    278:                 * to check our return code wont be able to make
                    279:                 * queries anyhow.
                    280:                 */
                    281:                RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
                    282:                maxns = 0;
                    283:        }
                    284: #ifdef RESOLVSORT
1.1       christos  285:        statp->nsort = 0;
1.14      christos  286: #endif
1.1       christos  287:        res_setservers(statp, u, nserv);
                    288:
1.9       christos  289: #ifdef SOLARIS2
                    290:        /*
                    291:         * The old libresolv derived the defaultdomain from NIS/NIS+.
                    292:         * We want to keep this behaviour
                    293:         */
                    294:        {
                    295:                char buf[sizeof(statp->defdname)], *cp;
                    296:                int ret;
                    297:
                    298:                if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
                    299:                        (unsigned int)ret <= sizeof(buf)) {
                    300:                        if (buf[0] == '+')
                    301:                                buf[0] = '.';
                    302:                        cp = strchr(buf, '.');
                    303:                        cp = (cp == NULL) ? buf : (cp + 1);
1.14      christos  304:                        (void)strlcpy(statp->defdname, cp,
                    305:                            sizeof(statp->defdname));
1.9       christos  306:                }
                    307:        }
                    308: #endif /* SOLARIS2 */
                    309:
1.1       christos  310:        /* Allow user to override the local domain definition */
                    311:        if ((cp = getenv("LOCALDOMAIN")) != NULL) {
                    312:                (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    313:                statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    314:                haveenv++;
                    315:
                    316:                /*
                    317:                 * Set search list to be blank-separated strings
                    318:                 * from rest of env value.  Permits users of LOCALDOMAIN
                    319:                 * to still have a search list, and anyone to set the
                    320:                 * one that they want to use as an individual (even more
                    321:                 * important now that the rfc1535 stuff restricts searches)
                    322:                 */
                    323:                cp = statp->defdname;
                    324:                pp = statp->dnsrch;
                    325:                *pp++ = cp;
                    326:                for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9       christos  327:                        if (*cp == '\n')        /*%< silly backwards compat */
1.1       christos  328:                                break;
                    329:                        else if (*cp == ' ' || *cp == '\t') {
                    330:                                *cp = 0;
                    331:                                n = 1;
                    332:                        } else if (n) {
                    333:                                *pp++ = cp;
                    334:                                n = 0;
                    335:                                havesearch = 1;
                    336:                        }
                    337:                }
                    338:                /* null terminate last domain if there are excess */
                    339:                while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
                    340:                        cp++;
                    341:                *cp = '\0';
                    342:                *pp++ = 0;
                    343:        }
                    344:
                    345: #define        MATCH(line, name) \
                    346:        (!strncmp(line, name, sizeof(name) - 1) && \
                    347:        (line[sizeof(name) - 1] == ' ' || \
                    348:         line[sizeof(name) - 1] == '\t'))
                    349:
                    350:        nserv = 0;
1.28    ! christos  351:        if ((fp = fopen(__res_conf_name, "re")) != NULL) {
1.21      christos  352:            struct stat st;
                    353:            struct kevent kc;
                    354:
1.1       christos  355:            /* read the config file */
1.24      christos  356:            while (fgets(buf, (int)sizeof(buf), fp) != NULL) {
1.1       christos  357:                /* skip comments */
                    358:                if (*buf == ';' || *buf == '#')
                    359:                        continue;
                    360:                /* read default domain name */
                    361:                if (MATCH(buf, "domain")) {
1.9       christos  362:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  363:                            continue;
                    364:                    cp = buf + sizeof("domain") - 1;
                    365:                    while (*cp == ' ' || *cp == '\t')
                    366:                            cp++;
                    367:                    if ((*cp == '\0') || (*cp == '\n'))
                    368:                            continue;
                    369:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    370:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    371:                    if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
                    372:                            *cp = '\0';
                    373:                    havesearch = 0;
                    374:                    continue;
                    375:                }
                    376:                /* set search list */
                    377:                if (MATCH(buf, "search")) {
1.9       christos  378:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  379:                            continue;
                    380:                    cp = buf + sizeof("search") - 1;
                    381:                    while (*cp == ' ' || *cp == '\t')
                    382:                            cp++;
                    383:                    if ((*cp == '\0') || (*cp == '\n'))
                    384:                            continue;
                    385:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    386:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    387:                    if ((cp = strchr(statp->defdname, '\n')) != NULL)
                    388:                            *cp = '\0';
                    389:                    /*
                    390:                     * Set search list to be blank-separated strings
                    391:                     * on rest of line.
                    392:                     */
                    393:                    cp = statp->defdname;
                    394:                    pp = statp->dnsrch;
                    395:                    *pp++ = cp;
                    396:                    for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
                    397:                            if (*cp == ' ' || *cp == '\t') {
                    398:                                    *cp = 0;
                    399:                                    n = 1;
                    400:                            } else if (n) {
                    401:                                    *pp++ = cp;
                    402:                                    n = 0;
                    403:                            }
                    404:                    }
                    405:                    /* null terminate last domain if there are excess */
                    406:                    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
                    407:                            cp++;
                    408:                    *cp = '\0';
                    409:                    *pp++ = 0;
                    410:                    havesearch = 1;
                    411:                    continue;
                    412:                }
                    413:                /* read nameservers to query */
1.14      christos  414:                if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1       christos  415:                    struct addrinfo hints, *ai;
                    416:                    char sbuf[NI_MAXSERV];
                    417:                    const size_t minsiz =
                    418:                        sizeof(statp->_u._ext.ext->nsaddrs[0]);
                    419:
                    420:                    cp = buf + sizeof("nameserver") - 1;
                    421:                    while (*cp == ' ' || *cp == '\t')
                    422:                        cp++;
                    423:                    cp[strcspn(cp, ";# \t\n")] = '\0';
                    424:                    if ((*cp != '\0') && (*cp != '\n')) {
                    425:                        memset(&hints, 0, sizeof(hints));
                    426:                        hints.ai_family = PF_UNSPEC;
                    427:                        hints.ai_socktype = SOCK_DGRAM; /*dummy*/
                    428:                        hints.ai_flags = AI_NUMERICHOST;
                    429:                        sprintf(sbuf, "%u", NAMESERVER_PORT);
                    430:                        if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
                    431:                            ai->ai_addrlen <= minsiz) {
                    432:                            if (statp->_u._ext.ext != NULL) {
                    433:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    434:                                    ai->ai_addr, ai->ai_addrlen);
                    435:                            }
                    436:                            if (ai->ai_addrlen <=
                    437:                                sizeof(statp->nsaddr_list[nserv])) {
                    438:                                memcpy(&statp->nsaddr_list[nserv],
                    439:                                    ai->ai_addr, ai->ai_addrlen);
                    440:                            } else
                    441:                                statp->nsaddr_list[nserv].sin_family = 0;
                    442:                            freeaddrinfo(ai);
                    443:                            nserv++;
                    444:                        }
                    445:                    }
                    446:                    continue;
                    447:                }
1.14      christos  448: #ifdef RESOLVSORT
1.1       christos  449:                if (MATCH(buf, "sortlist")) {
                    450:                    struct in_addr a;
                    451:
                    452:                    cp = buf + sizeof("sortlist") - 1;
                    453:                    while (nsort < MAXRESOLVSORT) {
                    454:                        while (*cp == ' ' || *cp == '\t')
                    455:                            cp++;
                    456:                        if (*cp == '\0' || *cp == '\n' || *cp == ';')
                    457:                            break;
                    458:                        net = cp;
                    459:                        while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
                    460:                               isascii(*cp) && !isspace((unsigned char)*cp))
                    461:                                cp++;
                    462:                        n = *cp;
                    463:                        *cp = 0;
                    464:                        if (inet_aton(net, &a)) {
                    465:                            statp->sort_list[nsort].addr = a;
                    466:                            if (ISSORTMASK(n)) {
                    467:                                *cp++ = n;
                    468:                                net = cp;
                    469:                                while (*cp && *cp != ';' &&
                    470:                                        isascii(*cp) &&
                    471:                                        !isspace((unsigned char)*cp))
                    472:                                    cp++;
                    473:                                n = *cp;
                    474:                                *cp = 0;
                    475:                                if (inet_aton(net, &a)) {
                    476:                                    statp->sort_list[nsort].mask = a.s_addr;
                    477:                                } else {
                    478:                                    statp->sort_list[nsort].mask =
                    479:                                        net_mask(statp->sort_list[nsort].addr);
                    480:                                }
                    481:                            } else {
                    482:                                statp->sort_list[nsort].mask =
                    483:                                    net_mask(statp->sort_list[nsort].addr);
                    484:                            }
                    485:                            nsort++;
                    486:                        }
                    487:                        *cp = n;
                    488:                    }
                    489:                    continue;
                    490:                }
1.14      christos  491: #endif
1.1       christos  492:                if (MATCH(buf, "options")) {
                    493:                    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
                    494:                    continue;
                    495:                }
                    496:            }
                    497:            if (nserv > 0)
                    498:                statp->nscount = nserv;
1.14      christos  499: #ifdef RESOLVSORT
1.1       christos  500:            statp->nsort = nsort;
1.14      christos  501: #endif
1.21      christos  502:            statp->_u._ext.ext->resfd = dup(fileno(fp));
1.1       christos  503:            (void) fclose(fp);
1.21      christos  504:            if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
                    505:                    __res_conf_time = statp->_u._ext.ext->res_conf_time =
                    506:                        st.st_mtimespec;
1.23      christos  507:            statp->_u._ext.ext->kq = kqueue1(O_CLOEXEC);
1.21      christos  508:            EV_SET(&kc, statp->_u._ext.ext->resfd, EVFILT_VNODE,
                    509:                EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND|
                    510:                NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0);
                    511:            (void)kevent(statp->_u._ext.ext->kq, &kc, 1, NULL, 0, &ts);
                    512:        } else {
                    513:            statp->_u._ext.ext->kq = -1;
                    514:            statp->_u._ext.ext->resfd = -1;
1.1       christos  515:        }
                    516: /*
                    517:  * Last chance to get a nameserver.  This should not normally
                    518:  * be necessary
                    519:  */
                    520: #ifdef NO_RESOLV_CONF
                    521:        if(nserv == 0)
                    522:                nserv = get_nameservers(statp);
                    523: #endif
                    524:
                    525:        if (statp->defdname[0] == 0 &&
                    526:            gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
                    527:            (cp = strchr(buf, '.')) != NULL)
                    528:                strcpy(statp->defdname, cp + 1);
                    529:
                    530:        /* find components of local domain that might be searched */
                    531:        if (havesearch == 0) {
                    532:                pp = statp->dnsrch;
                    533:                *pp++ = statp->defdname;
                    534:                *pp = NULL;
                    535:
                    536:                dots = 0;
                    537:                for (cp = statp->defdname; *cp; cp++)
                    538:                        dots += (*cp == '.');
                    539:
                    540:                cp = statp->defdname;
                    541:                while (pp < statp->dnsrch + MAXDFLSRCH) {
                    542:                        if (dots < LOCALDOMAINPARTS)
                    543:                                break;
1.9       christos  544:                        cp = strchr(cp, '.') + 1;    /*%< we know there is one */
1.1       christos  545:                        *pp++ = cp;
                    546:                        dots--;
                    547:                }
                    548:                *pp = NULL;
                    549: #ifdef DEBUG
                    550:                if (statp->options & RES_DEBUG) {
                    551:                        printf(";; res_init()... default dnsrch list:\n");
                    552:                        for (pp = statp->dnsrch; *pp; pp++)
                    553:                                printf(";;\t%s\n", *pp);
                    554:                        printf(";;\t..END..\n");
                    555:                }
                    556: #endif
                    557:        }
                    558:
                    559:        if ((cp = getenv("RES_OPTIONS")) != NULL)
                    560:                res_setoptions(statp, cp, "env");
                    561:        statp->options |= RES_INIT;
1.14      christos  562:        return (statp->res_h_errno);
1.1       christos  563: }
                    564:
1.22      christos  565: int
                    566: res_check(res_state statp, struct timespec *mtime)
1.21      christos  567: {
                    568:        /*
                    569:         * If the times are equal, then we check if there
                    570:         * was a kevent related to resolv.conf and reload.
                    571:         * If the times are not equal, then we don't bother
                    572:         * to check the kevent, because another thread already
                    573:         * did, loaded and changed the time.
                    574:         */
                    575:        if (timespeccmp(&statp->_u._ext.ext->res_conf_time,
                    576:            &__res_conf_time, ==)) {
                    577:                struct kevent ke;
                    578:                if (statp->_u._ext.ext->kq == -1)
1.22      christos  579:                        goto out;
1.21      christos  580:
                    581:                switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
                    582:                case 0:
                    583:                case -1:
1.22      christos  584: out:
                    585:                        if (mtime)
                    586:                                *mtime = __res_conf_time;
                    587:                        return 0;
1.21      christos  588:                default:
                    589:                        break;
                    590:                }
                    591:        }
                    592:        (void)__res_vinit(statp, 0);
1.22      christos  593:        if (mtime)
                    594:                *mtime = __res_conf_time;
                    595:        return 1;
1.21      christos  596: }
                    597:
1.1       christos  598: static void
                    599: res_setoptions(res_state statp, const char *options, const char *source)
                    600: {
                    601:        const char *cp = options;
                    602:        int i;
1.24      christos  603:        size_t j;
1.1       christos  604:        struct __res_state_ext *ext = statp->_u._ext.ext;
                    605:
                    606: #ifdef DEBUG
                    607:        if (statp->options & RES_DEBUG)
                    608:                printf(";; res_setoptions(\"%s\", \"%s\")...\n",
                    609:                       options, source);
                    610: #endif
                    611:        while (*cp) {
                    612:                /* skip leading and inner runs of spaces */
                    613:                while (*cp == ' ' || *cp == '\t')
                    614:                        cp++;
                    615:                /* search for and process individual options */
                    616:                if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
                    617:                        i = atoi(cp + sizeof("ndots:") - 1);
                    618:                        if (i <= RES_MAXNDOTS)
                    619:                                statp->ndots = i;
                    620:                        else
                    621:                                statp->ndots = RES_MAXNDOTS;
                    622: #ifdef DEBUG
                    623:                        if (statp->options & RES_DEBUG)
                    624:                                printf(";;\tndots=%d\n", statp->ndots);
                    625: #endif
                    626:                } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
                    627:                        i = atoi(cp + sizeof("timeout:") - 1);
                    628:                        if (i <= RES_MAXRETRANS)
                    629:                                statp->retrans = i;
                    630:                        else
                    631:                                statp->retrans = RES_MAXRETRANS;
                    632: #ifdef DEBUG
                    633:                        if (statp->options & RES_DEBUG)
                    634:                                printf(";;\ttimeout=%d\n", statp->retrans);
                    635: #endif
1.9       christos  636: #ifdef SOLARIS2
                    637:                } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
                    638:                        /*
                    639:                         * For backward compatibility, 'retrans' is
                    640:                         * supported as an alias for 'timeout', though
                    641:                         * without an imposed maximum.
                    642:                         */
                    643:                        statp->retrans = atoi(cp + sizeof("retrans:") - 1);
                    644:                } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
                    645:                        /*
                    646:                         * For backward compatibility, 'retry' is
                    647:                         * supported as an alias for 'attempts', though
                    648:                         * without an imposed maximum.
                    649:                         */
                    650:                        statp->retry = atoi(cp + sizeof("retry:") - 1);
                    651: #endif /* SOLARIS2 */
1.1       christos  652:                } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
                    653:                        i = atoi(cp + sizeof("attempts:") - 1);
                    654:                        if (i <= RES_MAXRETRY)
                    655:                                statp->retry = i;
                    656:                        else
                    657:                                statp->retry = RES_MAXRETRY;
                    658: #ifdef DEBUG
                    659:                        if (statp->options & RES_DEBUG)
                    660:                                printf(";;\tattempts=%d\n", statp->retry);
                    661: #endif
                    662:                } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
                    663: #ifdef DEBUG
                    664:                        if (!(statp->options & RES_DEBUG)) {
                    665:                                printf(";; res_setoptions(\"%s\", \"%s\")..\n",
                    666:                                       options, source);
                    667:                                statp->options |= RES_DEBUG;
                    668:                        }
                    669:                        printf(";;\tdebug\n");
                    670: #endif
                    671:                } else if (!strncmp(cp, "no_tld_query",
                    672:                                    sizeof("no_tld_query") - 1) ||
                    673:                           !strncmp(cp, "no-tld-query",
                    674:                                    sizeof("no-tld-query") - 1)) {
                    675:                        statp->options |= RES_NOTLDQUERY;
                    676:                } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
                    677:                        statp->options |= RES_USE_INET6;
                    678:                } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
                    679:                        statp->options |= RES_ROTATE;
                    680:                } else if (!strncmp(cp, "no-check-names",
                    681:                                    sizeof("no-check-names") - 1)) {
                    682:                        statp->options |= RES_NOCHECKNAME;
1.26      christos  683:                } else if (!strncmp(cp, "check-names",
                    684:                                    sizeof("check-names") - 1)) {
                    685:                        statp->options &= ~RES_NOCHECKNAME;
1.1       christos  686:                }
                    687: #ifdef RES_USE_EDNS0
                    688:                else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
                    689:                        statp->options |= RES_USE_EDNS0;
                    690:                }
                    691: #endif
                    692:                else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
                    693:                        statp->options |= RES_USE_DNAME;
                    694:                }
                    695:                else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
                    696:                        if (ext == NULL)
                    697:                                goto skip;
                    698:                        cp += sizeof("nibble:") - 1;
1.24      christos  699:                        j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
                    700:                        strncpy(ext->nsuffix, cp, j);
                    701:                        ext->nsuffix[j] = '\0';
1.1       christos  702:                }
                    703:                else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
                    704:                        if (ext == NULL)
                    705:                                goto skip;
                    706:                        cp += sizeof("nibble2:") - 1;
1.24      christos  707:                        j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
                    708:                        strncpy(ext->nsuffix2, cp, j);
                    709:                        ext->nsuffix2[j] = '\0';
1.1       christos  710:                }
                    711:                else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
                    712:                        cp += sizeof("v6revmode:") - 1;
                    713:                        /* "nibble" and "bitstring" used to be valid */
                    714:                        if (!strncmp(cp, "single", sizeof("single") - 1)) {
                    715:                                statp->options |= RES_NO_NIBBLE2;
                    716:                        } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
                    717:                                statp->options &=
                    718:                                         ~RES_NO_NIBBLE2;
                    719:                        }
                    720:                }
                    721:                else {
                    722:                        /* XXX - print a warning here? */
                    723:                }
                    724:    skip:
                    725:                /* skip to next run of spaces */
                    726:                while (*cp && *cp != ' ' && *cp != '\t')
                    727:                        cp++;
                    728:        }
                    729: }
                    730:
1.14      christos  731: #ifdef RESOLVSORT
1.1       christos  732: /* XXX - should really support CIDR which means explicit masks always. */
1.25      matt      733: static uint32_t
                    734: net_mask(struct in_addr in) /*!< XXX - should really use system's version of this  */
1.1       christos  735: {
1.25      matt      736:        register uint32_t i = ntohl(in.s_addr);
1.1       christos  737:
                    738:        if (IN_CLASSA(i))
                    739:                return (htonl(IN_CLASSA_NET));
                    740:        else if (IN_CLASSB(i))
                    741:                return (htonl(IN_CLASSB_NET));
                    742:        return (htonl(IN_CLASSC_NET));
                    743: }
1.14      christos  744: #endif
1.1       christos  745:
1.20      christos  746: static u_char srnd[16];
                    747:
1.17      christos  748: void
                    749: res_rndinit(res_state statp)
                    750: {
                    751:        struct timeval now;
1.25      matt      752:        uint32_t u32;
                    753:        uint16_t u16;
1.20      christos  754:        u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.17      christos  755:
                    756:        gettimeofday(&now, NULL);
1.25      matt      757:        u32 = (uint32_t)now.tv_sec;
1.20      christos  758:        memcpy(rnd, &u32, 4);
1.17      christos  759:        u32 = now.tv_usec;
1.20      christos  760:        memcpy(rnd + 4, &u32, 4);
1.25      matt      761:        u32 += (uint32_t)now.tv_sec;
1.20      christos  762:        memcpy(rnd + 8, &u32, 4);
1.17      christos  763:        u16 = getpid();
1.20      christos  764:        memcpy(rnd + 12, &u16, 2);
1.17      christos  765: }
                    766:
1.1       christos  767: u_int
1.25      matt      768: res_nrandomid(res_state statp)
                    769: {
1.1       christos  770:        struct timeval now;
1.25      matt      771:        uint16_t u16;
1.17      christos  772:        MD5_CTX ctx;
1.20      christos  773:        u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1       christos  774:
                    775:        gettimeofday(&now, NULL);
1.25      matt      776:        u16 = (uint16_t) (now.tv_sec ^ now.tv_usec);
1.20      christos  777:        memcpy(rnd + 14, &u16, 2);
1.17      christos  778: #ifndef HAVE_MD5
                    779:        MD5_Init(&ctx);
1.20      christos  780:        MD5_Update(&ctx, rnd, 16);
                    781:        MD5_Final(rnd, &ctx);
1.17      christos  782: #else
                    783:        MD5Init(&ctx);
1.20      christos  784:        MD5Update(&ctx, rnd, 16);
                    785:        MD5Final(rnd, &ctx);
1.17      christos  786: #endif
1.20      christos  787:        memcpy(&u16, rnd + 14, 2);
1.17      christos  788:        return ((u_int) u16);
1.1       christos  789: }
                    790:
1.9       christos  791: /*%
1.1       christos  792:  * This routine is for closing the socket if a virtual circuit is used and
                    793:  * the program wants to close it.  This provides support for endhostent()
                    794:  * which expects to close the socket.
                    795:  *
                    796:  * This routine is not expected to be user visible.
                    797:  */
                    798: void
1.25      matt      799: res_nclose(res_state statp)
                    800: {
1.1       christos  801:        int ns;
                    802:
                    803:        if (statp->_vcsock >= 0) {
                    804:                (void) close(statp->_vcsock);
                    805:                statp->_vcsock = -1;
                    806:                statp->_flags &= ~(RES_F_VC | RES_F_CONN);
                    807:        }
                    808:        for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
                    809:                if (statp->_u._ext.nssocks[ns] != -1) {
                    810:                        (void) close(statp->_u._ext.nssocks[ns]);
                    811:                        statp->_u._ext.nssocks[ns] = -1;
                    812:                }
                    813:        }
                    814: }
                    815:
                    816: void
1.25      matt      817: res_ndestroy(res_state statp)
                    818: {
1.1       christos  819:        res_nclose(statp);
1.20      christos  820:        if (statp->_u._ext.ext != NULL) {
1.21      christos  821:                if (statp->_u._ext.ext->kq != -1)
                    822:                        (void)close(statp->_u._ext.ext->kq);
                    823:                if (statp->_u._ext.ext->resfd != -1)
                    824:                        (void)close(statp->_u._ext.ext->resfd);
1.1       christos  825:                free(statp->_u._ext.ext);
1.20      christos  826:                statp->_u._ext.ext = NULL;
                    827:        }
                    828:        if (statp->_rnd != NULL) {
                    829:                free(statp->_rnd);
                    830:                statp->_rnd = NULL;
                    831:        }
1.1       christos  832:        statp->options &= ~RES_INIT;
                    833: }
                    834:
                    835: const char *
1.25      matt      836: res_get_nibblesuffix(res_state statp)
                    837: {
1.1       christos  838:        if (statp->_u._ext.ext)
                    839:                return (statp->_u._ext.ext->nsuffix);
                    840:        return ("ip6.arpa");
                    841: }
                    842:
                    843: const char *
1.25      matt      844: res_get_nibblesuffix2(res_state statp)
                    845: {
1.1       christos  846:        if (statp->_u._ext.ext)
                    847:                return (statp->_u._ext.ext->nsuffix2);
                    848:        return ("ip6.int");
                    849: }
                    850:
                    851: void
1.25      matt      852: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
                    853: {
1.1       christos  854:        int i, nserv;
                    855:        size_t size;
                    856:
                    857:        /* close open servers */
                    858:        res_nclose(statp);
                    859:
                    860:        /* cause rtt times to be forgotten */
                    861:        statp->_u._ext.nscount = 0;
                    862:
                    863:        nserv = 0;
                    864:        for (i = 0; i < cnt && nserv < MAXNS; i++) {
                    865:                switch (set->sin.sin_family) {
                    866:                case AF_INET:
                    867:                        size = sizeof(set->sin);
                    868:                        if (statp->_u._ext.ext)
                    869:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    870:                                        &set->sin, size);
                    871:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    872:                                memcpy(&statp->nsaddr_list[nserv],
                    873:                                        &set->sin, size);
                    874:                        else
                    875:                                statp->nsaddr_list[nserv].sin_family = 0;
                    876:                        nserv++;
                    877:                        break;
                    878:
                    879: #ifdef HAS_INET6_STRUCTS
                    880:                case AF_INET6:
                    881:                        size = sizeof(set->sin6);
                    882:                        if (statp->_u._ext.ext)
                    883:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    884:                                        &set->sin6, size);
                    885:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    886:                                memcpy(&statp->nsaddr_list[nserv],
                    887:                                        &set->sin6, size);
                    888:                        else
                    889:                                statp->nsaddr_list[nserv].sin_family = 0;
                    890:                        nserv++;
                    891:                        break;
                    892: #endif
                    893:
                    894:                default:
                    895:                        break;
                    896:                }
                    897:                set++;
                    898:        }
                    899:        statp->nscount = nserv;
                    900:
                    901: }
                    902:
                    903: int
1.25      matt      904: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
                    905: {
1.1       christos  906:        int i;
                    907:        size_t size;
1.25      matt      908:        uint16_t family;
1.1       christos  909:
                    910:        for (i = 0; i < statp->nscount && i < cnt; i++) {
                    911:                if (statp->_u._ext.ext)
                    912:                        family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
                    913:                else
                    914:                        family = statp->nsaddr_list[i].sin_family;
                    915:
                    916:                switch (family) {
                    917:                case AF_INET:
                    918:                        size = sizeof(set->sin);
                    919:                        if (statp->_u._ext.ext)
                    920:                                memcpy(&set->sin,
                    921:                                       &statp->_u._ext.ext->nsaddrs[i],
                    922:                                       size);
                    923:                        else
                    924:                                memcpy(&set->sin, &statp->nsaddr_list[i],
                    925:                                       size);
                    926:                        break;
                    927:
                    928: #ifdef HAS_INET6_STRUCTS
                    929:                case AF_INET6:
                    930:                        size = sizeof(set->sin6);
                    931:                        if (statp->_u._ext.ext)
                    932:                                memcpy(&set->sin6,
                    933:                                       &statp->_u._ext.ext->nsaddrs[i],
                    934:                                       size);
                    935:                        else
                    936:                                memcpy(&set->sin6, &statp->nsaddr_list[i],
                    937:                                       size);
                    938:                        break;
                    939: #endif
                    940:
                    941:                default:
                    942:                        set->sin.sin_family = 0;
                    943:                        break;
                    944:                }
                    945:                set++;
                    946:        }
                    947:        return (statp->nscount);
                    948: }
1.9       christos  949:
                    950: /*! \file */

CVSweb <webmaster@jp.NetBSD.org>