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Annotation of src/lib/libc/resolv/res_init.c, Revision 1.15.12.1

1.15.12.1! riz         1: /*     $NetBSD: res_init.c,v 1.22 2009/10/24 17:24:01 christos 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";
1.15.12.1! riz        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
1.15.12.1! riz        79: __RCSID("$NetBSD: res_init.c,v 1.22 2009/10/24 17:24:01 christos 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>
1.15.12.1! riz        89: #include <sys/stat.h>
1.1       christos   90: #include <sys/time.h>
1.15.12.1! riz        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>
1.15.12.1! riz       102: #include <fcntl.h>
1.1       christos  103: #include <netdb.h>
                    104:
1.15.12.1! riz       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:
1.1       christos  150: static void res_setoptions __P((res_state, const char *, const char *));
                    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)
                    155: static u_int32_t net_mask __P((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:
1.15.12.1! riz       162: static struct timespec __res_conf_time;
        !           163: static const struct timespec ts = { 0, 0 };
        !           164:
1.1       christos  165: /*
                    166:  * Resolver state default settings.
                    167:  */
                    168:
1.9       christos  169: /*%
1.1       christos  170:  * Set up default settings.  If the configuration file exist, the values
                    171:  * there will have precedence.  Otherwise, the server address is set to
                    172:  * INADDR_ANY and the default domain name comes from the gethostname().
                    173:  *
                    174:  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
                    175:  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
                    176:  * since it was noted that INADDR_ANY actually meant ``the first interface
                    177:  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
                    178:  * it had to be "up" in order for you to reach your own name server.  It
                    179:  * was later decided that since the recommended practice is to always
                    180:  * install local static routes through 127.0.0.1 for all your network
                    181:  * interfaces, that we could solve this problem without a code change.
                    182:  *
                    183:  * The configuration file should always be used, since it is the only way
                    184:  * to specify a default domain.  If you are running a server on your local
                    185:  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
                    186:  * in the configuration file.
                    187:  *
                    188:  * Return 0 if completes successfully, -1 on error
                    189:  */
                    190: int
                    191: res_ninit(res_state statp) {
                    192:        return (__res_vinit(statp, 0));
                    193: }
                    194:
1.9       christos  195: /*% This function has to be reachable by res_data.c but not publically. */
1.1       christos  196: int
                    197: __res_vinit(res_state statp, int preinit) {
                    198:        register FILE *fp;
                    199:        register char *cp, **pp;
                    200:        register int n;
                    201:        char buf[BUFSIZ];
1.9       christos  202:        int nserv = 0;    /*%< number of nameserver records read from file */
1.1       christos  203:        int haveenv = 0;
                    204:        int havesearch = 0;
1.14      christos  205: #ifdef RESOLVSORT
1.1       christos  206:        int nsort = 0;
                    207:        char *net;
1.14      christos  208: #endif
1.1       christos  209:        int dots;
                    210:        union res_sockaddr_union u[2];
1.14      christos  211:        int maxns = MAXNS;
                    212:
                    213:        RES_SET_H_ERRNO(statp, 0);
                    214:
1.15.12.1! riz       215:        if ((statp->options & RES_INIT) != 0U)
        !           216:                res_ndestroy(statp);
        !           217:
1.1       christos  218:        if (!preinit) {
                    219:                statp->retrans = RES_TIMEOUT;
                    220:                statp->retry = RES_DFLRETRY;
                    221:                statp->options = RES_DEFAULT;
                    222:        }
1.15.12.1! riz       223:        statp->_rnd = malloc(16);
        !           224:        res_rndinit(statp);
        !           225:        statp->id = res_nrandomid(statp);
1.12      christos  226:
1.1       christos  227:        memset(u, 0, sizeof(u));
                    228: #ifdef USELOOPBACK
                    229:        u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
                    230: #else
                    231:        u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
                    232: #endif
                    233:        u[nserv].sin.sin_family = AF_INET;
                    234:        u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
                    235: #ifdef HAVE_SA_LEN
                    236:        u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
                    237: #endif
                    238:        nserv++;
                    239: #ifdef HAS_INET6_STRUCTS
                    240: #ifdef USELOOPBACK
                    241:        u[nserv].sin6.sin6_addr = in6addr_loopback;
                    242: #else
                    243:        u[nserv].sin6.sin6_addr = in6addr_any;
                    244: #endif
                    245:        u[nserv].sin6.sin6_family = AF_INET6;
                    246:        u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
                    247: #ifdef HAVE_SA_LEN
                    248:        u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
                    249: #endif
                    250:        nserv++;
                    251: #endif
                    252:        statp->nscount = 0;
                    253:        statp->ndots = 1;
                    254:        statp->pfcode = 0;
                    255:        statp->_vcsock = -1;
                    256:        statp->_flags = 0;
                    257:        statp->qhook = NULL;
                    258:        statp->rhook = NULL;
                    259:        statp->_u._ext.nscount = 0;
                    260:        statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
                    261:        if (statp->_u._ext.ext != NULL) {
                    262:                memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
                    263:                statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
                    264:                strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
                    265:                strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14      christos  266:        } else {
                    267:                /*
                    268:                 * Historically res_init() rarely, if at all, failed.
                    269:                 * Examples and applications exist which do not check
                    270:                 * our return code.  Furthermore several applications
                    271:                 * simply call us to get the systems domainname.  So
                    272:                 * rather then immediately fail here we store the
                    273:                 * failure, which is returned later, in h_errno.  And
                    274:                 * prevent the collection of 'nameserver' information
                    275:                 * by setting maxns to 0.  Thus applications that fail
                    276:                 * to check our return code wont be able to make
                    277:                 * queries anyhow.
                    278:                 */
                    279:                RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
                    280:                maxns = 0;
                    281:        }
                    282: #ifdef RESOLVSORT
1.1       christos  283:        statp->nsort = 0;
1.14      christos  284: #endif
1.1       christos  285:        res_setservers(statp, u, nserv);
                    286:
1.9       christos  287: #ifdef SOLARIS2
                    288:        /*
                    289:         * The old libresolv derived the defaultdomain from NIS/NIS+.
                    290:         * We want to keep this behaviour
                    291:         */
                    292:        {
                    293:                char buf[sizeof(statp->defdname)], *cp;
                    294:                int ret;
                    295:
                    296:                if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
                    297:                        (unsigned int)ret <= sizeof(buf)) {
                    298:                        if (buf[0] == '+')
                    299:                                buf[0] = '.';
                    300:                        cp = strchr(buf, '.');
                    301:                        cp = (cp == NULL) ? buf : (cp + 1);
1.14      christos  302:                        (void)strlcpy(statp->defdname, cp,
                    303:                            sizeof(statp->defdname));
1.9       christos  304:                }
                    305:        }
                    306: #endif /* SOLARIS2 */
                    307:
1.1       christos  308:        /* Allow user to override the local domain definition */
                    309:        if ((cp = getenv("LOCALDOMAIN")) != NULL) {
                    310:                (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    311:                statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    312:                haveenv++;
                    313:
                    314:                /*
                    315:                 * Set search list to be blank-separated strings
                    316:                 * from rest of env value.  Permits users of LOCALDOMAIN
                    317:                 * to still have a search list, and anyone to set the
                    318:                 * one that they want to use as an individual (even more
                    319:                 * important now that the rfc1535 stuff restricts searches)
                    320:                 */
                    321:                cp = statp->defdname;
                    322:                pp = statp->dnsrch;
                    323:                *pp++ = cp;
                    324:                for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9       christos  325:                        if (*cp == '\n')        /*%< silly backwards compat */
1.1       christos  326:                                break;
                    327:                        else if (*cp == ' ' || *cp == '\t') {
                    328:                                *cp = 0;
                    329:                                n = 1;
                    330:                        } else if (n) {
                    331:                                *pp++ = cp;
                    332:                                n = 0;
                    333:                                havesearch = 1;
                    334:                        }
                    335:                }
                    336:                /* null terminate last domain if there are excess */
                    337:                while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
                    338:                        cp++;
                    339:                *cp = '\0';
                    340:                *pp++ = 0;
                    341:        }
                    342:
                    343: #define        MATCH(line, name) \
                    344:        (!strncmp(line, name, sizeof(name) - 1) && \
                    345:        (line[sizeof(name) - 1] == ' ' || \
                    346:         line[sizeof(name) - 1] == '\t'))
                    347:
                    348:        nserv = 0;
                    349:        if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
1.15.12.1! riz       350:            struct stat st;
        !           351:            struct kevent kc;
        !           352:
1.1       christos  353:            /* read the config file */
                    354:            while (fgets(buf, sizeof(buf), fp) != NULL) {
                    355:                /* skip comments */
                    356:                if (*buf == ';' || *buf == '#')
                    357:                        continue;
                    358:                /* read default domain name */
                    359:                if (MATCH(buf, "domain")) {
1.9       christos  360:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  361:                            continue;
                    362:                    cp = buf + sizeof("domain") - 1;
                    363:                    while (*cp == ' ' || *cp == '\t')
                    364:                            cp++;
                    365:                    if ((*cp == '\0') || (*cp == '\n'))
                    366:                            continue;
                    367:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    368:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    369:                    if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
                    370:                            *cp = '\0';
                    371:                    havesearch = 0;
                    372:                    continue;
                    373:                }
                    374:                /* set search list */
                    375:                if (MATCH(buf, "search")) {
1.9       christos  376:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  377:                            continue;
                    378:                    cp = buf + sizeof("search") - 1;
                    379:                    while (*cp == ' ' || *cp == '\t')
                    380:                            cp++;
                    381:                    if ((*cp == '\0') || (*cp == '\n'))
                    382:                            continue;
                    383:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    384:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    385:                    if ((cp = strchr(statp->defdname, '\n')) != NULL)
                    386:                            *cp = '\0';
                    387:                    /*
                    388:                     * Set search list to be blank-separated strings
                    389:                     * on rest of line.
                    390:                     */
                    391:                    cp = statp->defdname;
                    392:                    pp = statp->dnsrch;
                    393:                    *pp++ = cp;
                    394:                    for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
                    395:                            if (*cp == ' ' || *cp == '\t') {
                    396:                                    *cp = 0;
                    397:                                    n = 1;
                    398:                            } else if (n) {
                    399:                                    *pp++ = cp;
                    400:                                    n = 0;
                    401:                            }
                    402:                    }
                    403:                    /* null terminate last domain if there are excess */
                    404:                    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
                    405:                            cp++;
                    406:                    *cp = '\0';
                    407:                    *pp++ = 0;
                    408:                    havesearch = 1;
                    409:                    continue;
                    410:                }
                    411:                /* read nameservers to query */
1.14      christos  412:                if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1       christos  413:                    struct addrinfo hints, *ai;
                    414:                    char sbuf[NI_MAXSERV];
                    415:                    const size_t minsiz =
                    416:                        sizeof(statp->_u._ext.ext->nsaddrs[0]);
                    417:
                    418:                    cp = buf + sizeof("nameserver") - 1;
                    419:                    while (*cp == ' ' || *cp == '\t')
                    420:                        cp++;
                    421:                    cp[strcspn(cp, ";# \t\n")] = '\0';
                    422:                    if ((*cp != '\0') && (*cp != '\n')) {
                    423:                        memset(&hints, 0, sizeof(hints));
                    424:                        hints.ai_family = PF_UNSPEC;
                    425:                        hints.ai_socktype = SOCK_DGRAM; /*dummy*/
                    426:                        hints.ai_flags = AI_NUMERICHOST;
                    427:                        sprintf(sbuf, "%u", NAMESERVER_PORT);
                    428:                        if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
                    429:                            ai->ai_addrlen <= minsiz) {
                    430:                            if (statp->_u._ext.ext != NULL) {
                    431:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    432:                                    ai->ai_addr, ai->ai_addrlen);
                    433:                            }
                    434:                            if (ai->ai_addrlen <=
                    435:                                sizeof(statp->nsaddr_list[nserv])) {
                    436:                                memcpy(&statp->nsaddr_list[nserv],
                    437:                                    ai->ai_addr, ai->ai_addrlen);
                    438:                            } else
                    439:                                statp->nsaddr_list[nserv].sin_family = 0;
                    440:                            freeaddrinfo(ai);
                    441:                            nserv++;
                    442:                        }
                    443:                    }
                    444:                    continue;
                    445:                }
1.14      christos  446: #ifdef RESOLVSORT
1.1       christos  447:                if (MATCH(buf, "sortlist")) {
                    448:                    struct in_addr a;
                    449:
                    450:                    cp = buf + sizeof("sortlist") - 1;
                    451:                    while (nsort < MAXRESOLVSORT) {
                    452:                        while (*cp == ' ' || *cp == '\t')
                    453:                            cp++;
                    454:                        if (*cp == '\0' || *cp == '\n' || *cp == ';')
                    455:                            break;
                    456:                        net = cp;
                    457:                        while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
                    458:                               isascii(*cp) && !isspace((unsigned char)*cp))
                    459:                                cp++;
                    460:                        n = *cp;
                    461:                        *cp = 0;
                    462:                        if (inet_aton(net, &a)) {
                    463:                            statp->sort_list[nsort].addr = a;
                    464:                            if (ISSORTMASK(n)) {
                    465:                                *cp++ = n;
                    466:                                net = cp;
                    467:                                while (*cp && *cp != ';' &&
                    468:                                        isascii(*cp) &&
                    469:                                        !isspace((unsigned char)*cp))
                    470:                                    cp++;
                    471:                                n = *cp;
                    472:                                *cp = 0;
                    473:                                if (inet_aton(net, &a)) {
                    474:                                    statp->sort_list[nsort].mask = a.s_addr;
                    475:                                } else {
                    476:                                    statp->sort_list[nsort].mask =
                    477:                                        net_mask(statp->sort_list[nsort].addr);
                    478:                                }
                    479:                            } else {
                    480:                                statp->sort_list[nsort].mask =
                    481:                                    net_mask(statp->sort_list[nsort].addr);
                    482:                            }
                    483:                            nsort++;
                    484:                        }
                    485:                        *cp = n;
                    486:                    }
                    487:                    continue;
                    488:                }
1.14      christos  489: #endif
1.1       christos  490:                if (MATCH(buf, "options")) {
                    491:                    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
                    492:                    continue;
                    493:                }
                    494:            }
                    495:            if (nserv > 0)
                    496:                statp->nscount = nserv;
1.14      christos  497: #ifdef RESOLVSORT
1.1       christos  498:            statp->nsort = nsort;
1.14      christos  499: #endif
1.15.12.1! riz       500:            statp->_u._ext.ext->resfd = dup(fileno(fp));
1.1       christos  501:            (void) fclose(fp);
1.15.12.1! riz       502:            if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
        !           503:                    __res_conf_time = statp->_u._ext.ext->res_conf_time =
        !           504:                        st.st_mtimespec;
        !           505:            statp->_u._ext.ext->kq = kqueue();
        !           506:            (void)fcntl(statp->_u._ext.ext->kq, F_SETFD, FD_CLOEXEC);
        !           507:            (void)fcntl(statp->_u._ext.ext->resfd, F_SETFD, FD_CLOEXEC);
        !           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:
1.15.12.1! riz       565: int
        !           566: res_check(res_state statp, struct timespec *mtime)
        !           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)
        !           579:                        goto out;
        !           580:
        !           581:                switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
        !           582:                case 0:
        !           583:                case -1:
        !           584: out:
        !           585:                        if (mtime)
        !           586:                                *mtime = __res_conf_time;
        !           587:                        return 0;
        !           588:                default:
        !           589:                        break;
        !           590:                }
        !           591:        }
        !           592:        (void)__res_vinit(statp, 0);
        !           593:        if (mtime)
        !           594:                *mtime = __res_conf_time;
        !           595:        return 1;
        !           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;
                    603:        struct __res_state_ext *ext = statp->_u._ext.ext;
                    604:
                    605: #ifdef DEBUG
                    606:        if (statp->options & RES_DEBUG)
                    607:                printf(";; res_setoptions(\"%s\", \"%s\")...\n",
                    608:                       options, source);
                    609: #endif
                    610:        while (*cp) {
                    611:                /* skip leading and inner runs of spaces */
                    612:                while (*cp == ' ' || *cp == '\t')
                    613:                        cp++;
                    614:                /* search for and process individual options */
                    615:                if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
                    616:                        i = atoi(cp + sizeof("ndots:") - 1);
                    617:                        if (i <= RES_MAXNDOTS)
                    618:                                statp->ndots = i;
                    619:                        else
                    620:                                statp->ndots = RES_MAXNDOTS;
                    621: #ifdef DEBUG
                    622:                        if (statp->options & RES_DEBUG)
                    623:                                printf(";;\tndots=%d\n", statp->ndots);
                    624: #endif
                    625:                } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
                    626:                        i = atoi(cp + sizeof("timeout:") - 1);
                    627:                        if (i <= RES_MAXRETRANS)
                    628:                                statp->retrans = i;
                    629:                        else
                    630:                                statp->retrans = RES_MAXRETRANS;
                    631: #ifdef DEBUG
                    632:                        if (statp->options & RES_DEBUG)
                    633:                                printf(";;\ttimeout=%d\n", statp->retrans);
                    634: #endif
1.9       christos  635: #ifdef SOLARIS2
                    636:                } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
                    637:                        /*
                    638:                         * For backward compatibility, 'retrans' is
                    639:                         * supported as an alias for 'timeout', though
                    640:                         * without an imposed maximum.
                    641:                         */
                    642:                        statp->retrans = atoi(cp + sizeof("retrans:") - 1);
                    643:                } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
                    644:                        /*
                    645:                         * For backward compatibility, 'retry' is
                    646:                         * supported as an alias for 'attempts', though
                    647:                         * without an imposed maximum.
                    648:                         */
                    649:                        statp->retry = atoi(cp + sizeof("retry:") - 1);
                    650: #endif /* SOLARIS2 */
1.1       christos  651:                } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
                    652:                        i = atoi(cp + sizeof("attempts:") - 1);
                    653:                        if (i <= RES_MAXRETRY)
                    654:                                statp->retry = i;
                    655:                        else
                    656:                                statp->retry = RES_MAXRETRY;
                    657: #ifdef DEBUG
                    658:                        if (statp->options & RES_DEBUG)
                    659:                                printf(";;\tattempts=%d\n", statp->retry);
                    660: #endif
                    661:                } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
                    662: #ifdef DEBUG
                    663:                        if (!(statp->options & RES_DEBUG)) {
                    664:                                printf(";; res_setoptions(\"%s\", \"%s\")..\n",
                    665:                                       options, source);
                    666:                                statp->options |= RES_DEBUG;
                    667:                        }
                    668:                        printf(";;\tdebug\n");
                    669: #endif
                    670:                } else if (!strncmp(cp, "no_tld_query",
                    671:                                    sizeof("no_tld_query") - 1) ||
                    672:                           !strncmp(cp, "no-tld-query",
                    673:                                    sizeof("no-tld-query") - 1)) {
                    674:                        statp->options |= RES_NOTLDQUERY;
                    675:                } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
                    676:                        statp->options |= RES_USE_INET6;
                    677:                } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
                    678:                        statp->options |= RES_ROTATE;
                    679:                } else if (!strncmp(cp, "no-check-names",
                    680:                                    sizeof("no-check-names") - 1)) {
                    681:                        statp->options |= RES_NOCHECKNAME;
                    682:                }
                    683: #ifdef RES_USE_EDNS0
                    684:                else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
                    685:                        statp->options |= RES_USE_EDNS0;
                    686:                }
                    687: #endif
                    688:                else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
                    689:                        statp->options |= RES_USE_DNAME;
                    690:                }
                    691:                else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
                    692:                        if (ext == NULL)
                    693:                                goto skip;
                    694:                        cp += sizeof("nibble:") - 1;
                    695:                        i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
1.2       christos  696:                        strncpy(ext->nsuffix, cp, (size_t)i);
1.1       christos  697:                        ext->nsuffix[i] = '\0';
                    698:                }
                    699:                else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
                    700:                        if (ext == NULL)
                    701:                                goto skip;
                    702:                        cp += sizeof("nibble2:") - 1;
                    703:                        i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
1.2       christos  704:                        strncpy(ext->nsuffix2, cp, (size_t)i);
1.1       christos  705:                        ext->nsuffix2[i] = '\0';
                    706:                }
                    707:                else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
                    708:                        cp += sizeof("v6revmode:") - 1;
                    709:                        /* "nibble" and "bitstring" used to be valid */
                    710:                        if (!strncmp(cp, "single", sizeof("single") - 1)) {
                    711:                                statp->options |= RES_NO_NIBBLE2;
                    712:                        } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
                    713:                                statp->options &=
                    714:                                         ~RES_NO_NIBBLE2;
                    715:                        }
                    716:                }
                    717:                else {
                    718:                        /* XXX - print a warning here? */
                    719:                }
                    720:    skip:
                    721:                /* skip to next run of spaces */
                    722:                while (*cp && *cp != ' ' && *cp != '\t')
                    723:                        cp++;
                    724:        }
                    725: }
                    726:
1.14      christos  727: #ifdef RESOLVSORT
1.1       christos  728: /* XXX - should really support CIDR which means explicit masks always. */
                    729: static u_int32_t
1.9       christos  730: net_mask(in)           /*!< XXX - should really use system's version of this  */
1.1       christos  731:        struct in_addr in;
                    732: {
                    733:        register u_int32_t i = ntohl(in.s_addr);
                    734:
                    735:        if (IN_CLASSA(i))
                    736:                return (htonl(IN_CLASSA_NET));
                    737:        else if (IN_CLASSB(i))
                    738:                return (htonl(IN_CLASSB_NET));
                    739:        return (htonl(IN_CLASSC_NET));
                    740: }
1.14      christos  741: #endif
1.1       christos  742:
1.15.12.1! riz       743: static u_char srnd[16];
        !           744:
        !           745: void
        !           746: res_rndinit(res_state statp)
        !           747: {
        !           748:        struct timeval now;
        !           749:        u_int32_t u32;
        !           750:        u_int16_t u16;
        !           751:        u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
        !           752:
        !           753:        gettimeofday(&now, NULL);
        !           754:        u32 = (u_int32_t)now.tv_sec;
        !           755:        memcpy(rnd, &u32, 4);
        !           756:        u32 = now.tv_usec;
        !           757:        memcpy(rnd + 4, &u32, 4);
        !           758:        u32 += (u_int32_t)now.tv_sec;
        !           759:        memcpy(rnd + 8, &u32, 4);
        !           760:        u16 = getpid();
        !           761:        memcpy(rnd + 12, &u16, 2);
        !           762: }
        !           763:
1.1       christos  764: u_int
1.15.12.1! riz       765: res_nrandomid(res_state statp) {
1.1       christos  766:        struct timeval now;
1.15.12.1! riz       767:        u_int16_t u16;
        !           768:        MD5_CTX ctx;
        !           769:        u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1       christos  770:
                    771:        gettimeofday(&now, NULL);
1.15.12.1! riz       772:        u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
        !           773:        memcpy(rnd + 14, &u16, 2);
        !           774: #ifndef HAVE_MD5
        !           775:        MD5_Init(&ctx);
        !           776:        MD5_Update(&ctx, rnd, 16);
        !           777:        MD5_Final(rnd, &ctx);
        !           778: #else
        !           779:        MD5Init(&ctx);
        !           780:        MD5Update(&ctx, rnd, 16);
        !           781:        MD5Final(rnd, &ctx);
        !           782: #endif
        !           783:        memcpy(&u16, rnd + 14, 2);
        !           784:        return ((u_int) u16);
1.1       christos  785: }
                    786:
1.9       christos  787: /*%
1.1       christos  788:  * This routine is for closing the socket if a virtual circuit is used and
                    789:  * the program wants to close it.  This provides support for endhostent()
                    790:  * which expects to close the socket.
                    791:  *
                    792:  * This routine is not expected to be user visible.
                    793:  */
                    794: void
                    795: res_nclose(res_state statp) {
                    796:        int ns;
                    797:
                    798:        if (statp->_vcsock >= 0) {
                    799:                (void) close(statp->_vcsock);
                    800:                statp->_vcsock = -1;
                    801:                statp->_flags &= ~(RES_F_VC | RES_F_CONN);
                    802:        }
                    803:        for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
                    804:                if (statp->_u._ext.nssocks[ns] != -1) {
                    805:                        (void) close(statp->_u._ext.nssocks[ns]);
                    806:                        statp->_u._ext.nssocks[ns] = -1;
                    807:                }
                    808:        }
                    809: }
                    810:
                    811: void
                    812: res_ndestroy(res_state statp) {
                    813:        res_nclose(statp);
1.15.12.1! riz       814:        if (statp->_u._ext.ext != NULL) {
        !           815:                if (statp->_u._ext.ext->kq != -1)
        !           816:                        (void)close(statp->_u._ext.ext->kq);
        !           817:                if (statp->_u._ext.ext->resfd != -1)
        !           818:                        (void)close(statp->_u._ext.ext->resfd);
1.1       christos  819:                free(statp->_u._ext.ext);
1.15.12.1! riz       820:                statp->_u._ext.ext = NULL;
        !           821:        }
        !           822:        if (statp->_rnd != NULL) {
        !           823:                free(statp->_rnd);
        !           824:                statp->_rnd = NULL;
        !           825:        }
1.1       christos  826:        statp->options &= ~RES_INIT;
                    827: }
                    828:
                    829: const char *
                    830: res_get_nibblesuffix(res_state statp) {
                    831:        if (statp->_u._ext.ext)
                    832:                return (statp->_u._ext.ext->nsuffix);
                    833:        return ("ip6.arpa");
                    834: }
                    835:
                    836: const char *
                    837: res_get_nibblesuffix2(res_state statp) {
                    838:        if (statp->_u._ext.ext)
                    839:                return (statp->_u._ext.ext->nsuffix2);
                    840:        return ("ip6.int");
                    841: }
                    842:
                    843: void
                    844: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
                    845:        int i, nserv;
                    846:        size_t size;
                    847:
                    848:        /* close open servers */
                    849:        res_nclose(statp);
                    850:
                    851:        /* cause rtt times to be forgotten */
                    852:        statp->_u._ext.nscount = 0;
                    853:
                    854:        nserv = 0;
                    855:        for (i = 0; i < cnt && nserv < MAXNS; i++) {
                    856:                switch (set->sin.sin_family) {
                    857:                case AF_INET:
                    858:                        size = sizeof(set->sin);
                    859:                        if (statp->_u._ext.ext)
                    860:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    861:                                        &set->sin, size);
                    862:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    863:                                memcpy(&statp->nsaddr_list[nserv],
                    864:                                        &set->sin, size);
                    865:                        else
                    866:                                statp->nsaddr_list[nserv].sin_family = 0;
                    867:                        nserv++;
                    868:                        break;
                    869:
                    870: #ifdef HAS_INET6_STRUCTS
                    871:                case AF_INET6:
                    872:                        size = sizeof(set->sin6);
                    873:                        if (statp->_u._ext.ext)
                    874:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    875:                                        &set->sin6, size);
                    876:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    877:                                memcpy(&statp->nsaddr_list[nserv],
                    878:                                        &set->sin6, size);
                    879:                        else
                    880:                                statp->nsaddr_list[nserv].sin_family = 0;
                    881:                        nserv++;
                    882:                        break;
                    883: #endif
                    884:
                    885:                default:
                    886:                        break;
                    887:                }
                    888:                set++;
                    889:        }
                    890:        statp->nscount = nserv;
                    891:
                    892: }
                    893:
                    894: int
                    895: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
                    896:        int i;
                    897:        size_t size;
                    898:        u_int16_t family;
                    899:
                    900:        for (i = 0; i < statp->nscount && i < cnt; i++) {
                    901:                if (statp->_u._ext.ext)
                    902:                        family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
                    903:                else
                    904:                        family = statp->nsaddr_list[i].sin_family;
                    905:
                    906:                switch (family) {
                    907:                case AF_INET:
                    908:                        size = sizeof(set->sin);
                    909:                        if (statp->_u._ext.ext)
                    910:                                memcpy(&set->sin,
                    911:                                       &statp->_u._ext.ext->nsaddrs[i],
                    912:                                       size);
                    913:                        else
                    914:                                memcpy(&set->sin, &statp->nsaddr_list[i],
                    915:                                       size);
                    916:                        break;
                    917:
                    918: #ifdef HAS_INET6_STRUCTS
                    919:                case AF_INET6:
                    920:                        size = sizeof(set->sin6);
                    921:                        if (statp->_u._ext.ext)
                    922:                                memcpy(&set->sin6,
                    923:                                       &statp->_u._ext.ext->nsaddrs[i],
                    924:                                       size);
                    925:                        else
                    926:                                memcpy(&set->sin6, &statp->nsaddr_list[i],
                    927:                                       size);
                    928:                        break;
                    929: #endif
                    930:
                    931:                default:
                    932:                        set->sin.sin_family = 0;
                    933:                        break;
                    934:                }
                    935:                set++;
                    936:        }
                    937:        return (statp->nscount);
                    938: }
1.9       christos  939:
                    940: /*! \file */

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