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Annotation of src/lib/libc/resolv/res_init.c, Revision 1.32

1.32    ! christos    1: /*     $NetBSD: res_init.c,v 1.31 2017/04/19 22:21:07 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.
1.30      christos   15:  * 3. Neither the name of the University nor the names of its contributors
1.1       christos   16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
                     32: /*
                     33:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
                     34:  *
                     35:  * Permission to use, copy, modify, and distribute this software for any
                     36:  * purpose with or without fee is hereby granted, provided that the above
                     37:  * copyright notice and this permission notice appear in all copies, and that
                     38:  * the name of Digital Equipment Corporation not be used in advertising or
                     39:  * publicity pertaining to distribution of the document or software without
                     40:  * specific, written prior permission.
                     41:  *
                     42:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     43:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     44:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     45:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     46:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     47:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     48:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     49:  * SOFTWARE.
                     50:  */
                     51:
                     52: /*
                     53:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                     54:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     55:  *
                     56:  * Permission to use, copy, modify, and distribute this software for any
                     57:  * purpose with or without fee is hereby granted, provided that the above
                     58:  * copyright notice and this permission notice appear in all copies.
                     59:  *
                     60:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     61:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     62:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     63:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     64:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     65:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     66:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     67:  */
                     68:
1.3       christos   69: #include <sys/cdefs.h>
1.1       christos   70: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   71: #ifdef notdef
1.1       christos   72: static const char sccsid[] = "@(#)res_init.c   8.1 (Berkeley) 6/7/93";
1.17      christos   73: static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp";
1.3       christos   74: #else
1.32    ! christos   75: __RCSID("$NetBSD: res_init.c,v 1.31 2017/04/19 22:21:07 christos Exp $");
1.3       christos   76: #endif
1.1       christos   77: #endif /* LIBC_SCCS and not lint */
                     78:
                     79: #include "port_before.h"
                     80:
1.4       christos   81: #include "namespace.h"
1.1       christos   82: #include <sys/types.h>
                     83: #include <sys/param.h>
                     84: #include <sys/socket.h>
1.21      christos   85: #include <sys/stat.h>
1.1       christos   86: #include <sys/time.h>
1.21      christos   87: #include <sys/event.h>
1.1       christos   88:
                     89: #include <netinet/in.h>
                     90: #include <arpa/inet.h>
                     91: #include <arpa/nameser.h>
                     92:
                     93: #include <ctype.h>
                     94: #include <stdio.h>
                     95: #include <stdlib.h>
                     96: #include <string.h>
                     97: #include <unistd.h>
1.21      christos   98: #include <fcntl.h>
1.1       christos   99: #include <netdb.h>
                    100:
1.17      christos  101: #define HAVE_MD5
                    102: #include <md5.h>
                    103:
                    104: #ifndef HAVE_MD5
                    105: # include "../dst/md5.h"
                    106: #else
                    107: # ifdef SOLARIS2
                    108: #  include <sys/md5.h>
                    109: # endif
                    110: #endif
                    111: #ifndef _MD5_H_
                    112: # define _MD5_H_ 1     /*%< make sure we do not include rsaref md5.h file */
                    113: #endif
                    114:
1.1       christos  115: #include "port_after.h"
                    116:
1.5       christos  117: #if 0
1.4       christos  118: #ifdef __weak_alias
                    119: __weak_alias(res_ninit,_res_ninit)
                    120: __weak_alias(res_randomid,__res_randomid)
                    121: __weak_alias(res_nclose,_res_nclose)
                    122: __weak_alias(res_ndestroy,_res_ndestroy)
                    123: __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
                    124: __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
                    125: __weak_alias(res_getservers,__res_getservers)
                    126: __weak_alias(res_setservers,__res_setservers)
                    127: #endif
1.5       christos  128: #endif
1.4       christos  129:
                    130:
1.1       christos  131: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
                    132: #include <resolv.h>
                    133:
                    134: #include "res_private.h"
                    135:
1.15      christos  136: #define RESOLVSORT
1.9       christos  137: /*% Options.  Should all be left alone. */
1.7       christos  138: #ifndef DEBUG
1.1       christos  139: #define DEBUG
1.7       christos  140: #endif
1.1       christos  141:
1.9       christos  142: #ifdef SOLARIS2
                    143: #include <sys/systeminfo.h>
                    144: #endif
                    145:
1.25      matt      146: static void res_setoptions(res_state, const char *, const char *);
1.1       christos  147:
1.14      christos  148: #ifdef RESOLVSORT
1.1       christos  149: static const char sort_mask[] = "/&";
                    150: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
1.25      matt      151: static uint32_t net_mask(struct in_addr);
1.14      christos  152: #endif
1.1       christos  153:
1.9       christos  154: #if !defined(isascii)  /*%< XXX - could be a function */
1.1       christos  155: # define isascii(c) (!(c & 0200))
                    156: #endif
                    157:
1.21      christos  158: static struct timespec __res_conf_time;
                    159: static const struct timespec ts = { 0, 0 };
                    160:
1.28      christos  161: const char *__res_conf_name = _PATH_RESCONF;
                    162:
1.1       christos  163: /*
                    164:  * Resolver state default settings.
                    165:  */
                    166:
1.9       christos  167: /*%
1.1       christos  168:  * Set up default settings.  If the configuration file exist, the values
                    169:  * there will have precedence.  Otherwise, the server address is set to
                    170:  * INADDR_ANY and the default domain name comes from the gethostname().
                    171:  *
                    172:  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
                    173:  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
                    174:  * since it was noted that INADDR_ANY actually meant ``the first interface
                    175:  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
                    176:  * it had to be "up" in order for you to reach your own name server.  It
                    177:  * was later decided that since the recommended practice is to always
                    178:  * install local static routes through 127.0.0.1 for all your network
                    179:  * interfaces, that we could solve this problem without a code change.
                    180:  *
                    181:  * The configuration file should always be used, since it is the only way
                    182:  * to specify a default domain.  If you are running a server on your local
                    183:  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
                    184:  * in the configuration file.
                    185:  *
                    186:  * Return 0 if completes successfully, -1 on error
                    187:  */
                    188: int
                    189: res_ninit(res_state statp) {
                    190:        return (__res_vinit(statp, 0));
                    191: }
                    192:
1.32    ! christos  193: static int
        !           194: __res_kqinit(res_state statp)
        !           195: {
        !           196:        struct kevent kc;
        !           197:        struct __res_state_ext *ext = statp->_u._ext.ext;
        !           198:
        !           199:        ext->kq = kqueue1(O_CLOEXEC);
        !           200:        ext->kqpid = getpid();
        !           201:        EV_SET(&kc, ext->resfd, EVFILT_VNODE,
        !           202:            EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND|
        !           203:            NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0);
        !           204:        (void)kevent(ext->kq, &kc, 1, NULL, 0, &ts);
        !           205:        return ext->kq;
        !           206: }
        !           207:
1.9       christos  208: /*% This function has to be reachable by res_data.c but not publically. */
1.1       christos  209: int
                    210: __res_vinit(res_state statp, int preinit) {
                    211:        register FILE *fp;
                    212:        register char *cp, **pp;
                    213:        register int n;
                    214:        char buf[BUFSIZ];
1.9       christos  215:        int nserv = 0;    /*%< number of nameserver records read from file */
1.1       christos  216:        int haveenv = 0;
                    217:        int havesearch = 0;
1.14      christos  218: #ifdef RESOLVSORT
1.1       christos  219:        int nsort = 0;
                    220:        char *net;
1.14      christos  221: #endif
1.1       christos  222:        int dots;
                    223:        union res_sockaddr_union u[2];
1.14      christos  224:        int maxns = MAXNS;
                    225:
                    226:        RES_SET_H_ERRNO(statp, 0);
                    227:
1.21      christos  228:        if ((statp->options & RES_INIT) != 0U)
                    229:                res_ndestroy(statp);
                    230:
1.1       christos  231:        if (!preinit) {
                    232:                statp->retrans = RES_TIMEOUT;
                    233:                statp->retry = RES_DFLRETRY;
                    234:                statp->options = RES_DEFAULT;
                    235:        }
1.21      christos  236:        statp->_rnd = malloc(16);
                    237:        res_rndinit(statp);
                    238:        statp->id = res_nrandomid(statp);
1.12      christos  239:
1.1       christos  240:        memset(u, 0, sizeof(u));
                    241: #ifdef USELOOPBACK
                    242:        u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
                    243: #else
                    244:        u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
                    245: #endif
                    246:        u[nserv].sin.sin_family = AF_INET;
                    247:        u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
                    248: #ifdef HAVE_SA_LEN
                    249:        u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
                    250: #endif
                    251:        nserv++;
                    252: #ifdef HAS_INET6_STRUCTS
                    253: #ifdef USELOOPBACK
                    254:        u[nserv].sin6.sin6_addr = in6addr_loopback;
                    255: #else
                    256:        u[nserv].sin6.sin6_addr = in6addr_any;
                    257: #endif
                    258:        u[nserv].sin6.sin6_family = AF_INET6;
                    259:        u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
                    260: #ifdef HAVE_SA_LEN
                    261:        u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
                    262: #endif
                    263:        nserv++;
                    264: #endif
                    265:        statp->nscount = 0;
                    266:        statp->ndots = 1;
                    267:        statp->pfcode = 0;
                    268:        statp->_vcsock = -1;
                    269:        statp->_flags = 0;
                    270:        statp->qhook = NULL;
                    271:        statp->rhook = NULL;
                    272:        statp->_u._ext.nscount = 0;
                    273:        statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
                    274:        if (statp->_u._ext.ext != NULL) {
                    275:                memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
                    276:                statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
                    277:                strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
                    278:                strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14      christos  279:        } else {
                    280:                /*
                    281:                 * Historically res_init() rarely, if at all, failed.
                    282:                 * Examples and applications exist which do not check
                    283:                 * our return code.  Furthermore several applications
                    284:                 * simply call us to get the systems domainname.  So
1.27      wiz       285:                 * rather than immediately fail here we store the
1.14      christos  286:                 * failure, which is returned later, in h_errno.  And
                    287:                 * prevent the collection of 'nameserver' information
                    288:                 * by setting maxns to 0.  Thus applications that fail
                    289:                 * to check our return code wont be able to make
                    290:                 * queries anyhow.
                    291:                 */
                    292:                RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
                    293:                maxns = 0;
                    294:        }
                    295: #ifdef RESOLVSORT
1.1       christos  296:        statp->nsort = 0;
1.14      christos  297: #endif
1.1       christos  298:        res_setservers(statp, u, nserv);
                    299:
1.9       christos  300: #ifdef SOLARIS2
                    301:        /*
                    302:         * The old libresolv derived the defaultdomain from NIS/NIS+.
                    303:         * We want to keep this behaviour
                    304:         */
                    305:        {
                    306:                char buf[sizeof(statp->defdname)], *cp;
                    307:                int ret;
                    308:
                    309:                if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
                    310:                        (unsigned int)ret <= sizeof(buf)) {
                    311:                        if (buf[0] == '+')
                    312:                                buf[0] = '.';
                    313:                        cp = strchr(buf, '.');
                    314:                        cp = (cp == NULL) ? buf : (cp + 1);
1.14      christos  315:                        (void)strlcpy(statp->defdname, cp,
                    316:                            sizeof(statp->defdname));
1.9       christos  317:                }
                    318:        }
                    319: #endif /* SOLARIS2 */
                    320:
1.1       christos  321:        /* Allow user to override the local domain definition */
                    322:        if ((cp = getenv("LOCALDOMAIN")) != NULL) {
                    323:                (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    324:                statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    325:                haveenv++;
                    326:
                    327:                /*
                    328:                 * Set search list to be blank-separated strings
                    329:                 * from rest of env value.  Permits users of LOCALDOMAIN
                    330:                 * to still have a search list, and anyone to set the
                    331:                 * one that they want to use as an individual (even more
                    332:                 * important now that the rfc1535 stuff restricts searches)
                    333:                 */
                    334:                cp = statp->defdname;
                    335:                pp = statp->dnsrch;
                    336:                *pp++ = cp;
                    337:                for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9       christos  338:                        if (*cp == '\n')        /*%< silly backwards compat */
1.1       christos  339:                                break;
                    340:                        else if (*cp == ' ' || *cp == '\t') {
                    341:                                *cp = 0;
                    342:                                n = 1;
                    343:                        } else if (n) {
                    344:                                *pp++ = cp;
                    345:                                n = 0;
                    346:                                havesearch = 1;
                    347:                        }
                    348:                }
                    349:                /* null terminate last domain if there are excess */
                    350:                while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
                    351:                        cp++;
                    352:                *cp = '\0';
                    353:                *pp++ = 0;
                    354:        }
                    355:
                    356: #define        MATCH(line, name) \
                    357:        (!strncmp(line, name, sizeof(name) - 1) && \
                    358:        (line[sizeof(name) - 1] == ' ' || \
                    359:         line[sizeof(name) - 1] == '\t'))
                    360:
                    361:        nserv = 0;
1.28      christos  362:        if ((fp = fopen(__res_conf_name, "re")) != NULL) {
1.21      christos  363:            struct stat st;
                    364:
1.1       christos  365:            /* read the config file */
1.24      christos  366:            while (fgets(buf, (int)sizeof(buf), fp) != NULL) {
1.1       christos  367:                /* skip comments */
                    368:                if (*buf == ';' || *buf == '#')
                    369:                        continue;
                    370:                /* read default domain name */
                    371:                if (MATCH(buf, "domain")) {
1.9       christos  372:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  373:                            continue;
                    374:                    cp = buf + sizeof("domain") - 1;
                    375:                    while (*cp == ' ' || *cp == '\t')
                    376:                            cp++;
                    377:                    if ((*cp == '\0') || (*cp == '\n'))
                    378:                            continue;
                    379:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    380:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    381:                    if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
                    382:                            *cp = '\0';
                    383:                    havesearch = 0;
                    384:                    continue;
                    385:                }
                    386:                /* set search list */
                    387:                if (MATCH(buf, "search")) {
1.9       christos  388:                    if (haveenv)        /*%< skip if have from environ */
1.1       christos  389:                            continue;
                    390:                    cp = buf + sizeof("search") - 1;
                    391:                    while (*cp == ' ' || *cp == '\t')
                    392:                            cp++;
                    393:                    if ((*cp == '\0') || (*cp == '\n'))
                    394:                            continue;
                    395:                    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
                    396:                    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
                    397:                    if ((cp = strchr(statp->defdname, '\n')) != NULL)
                    398:                            *cp = '\0';
                    399:                    /*
                    400:                     * Set search list to be blank-separated strings
                    401:                     * on rest of line.
                    402:                     */
                    403:                    cp = statp->defdname;
                    404:                    pp = statp->dnsrch;
                    405:                    *pp++ = cp;
                    406:                    for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
                    407:                            if (*cp == ' ' || *cp == '\t') {
                    408:                                    *cp = 0;
                    409:                                    n = 1;
                    410:                            } else if (n) {
                    411:                                    *pp++ = cp;
                    412:                                    n = 0;
                    413:                            }
                    414:                    }
                    415:                    /* null terminate last domain if there are excess */
                    416:                    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
                    417:                            cp++;
                    418:                    *cp = '\0';
                    419:                    *pp++ = 0;
                    420:                    havesearch = 1;
                    421:                    continue;
                    422:                }
                    423:                /* read nameservers to query */
1.14      christos  424:                if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1       christos  425:                    struct addrinfo hints, *ai;
                    426:                    char sbuf[NI_MAXSERV];
                    427:                    const size_t minsiz =
                    428:                        sizeof(statp->_u._ext.ext->nsaddrs[0]);
                    429:
                    430:                    cp = buf + sizeof("nameserver") - 1;
                    431:                    while (*cp == ' ' || *cp == '\t')
                    432:                        cp++;
                    433:                    cp[strcspn(cp, ";# \t\n")] = '\0';
                    434:                    if ((*cp != '\0') && (*cp != '\n')) {
                    435:                        memset(&hints, 0, sizeof(hints));
                    436:                        hints.ai_family = PF_UNSPEC;
                    437:                        hints.ai_socktype = SOCK_DGRAM; /*dummy*/
                    438:                        hints.ai_flags = AI_NUMERICHOST;
                    439:                        sprintf(sbuf, "%u", NAMESERVER_PORT);
                    440:                        if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
                    441:                            ai->ai_addrlen <= minsiz) {
                    442:                            if (statp->_u._ext.ext != NULL) {
                    443:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    444:                                    ai->ai_addr, ai->ai_addrlen);
                    445:                            }
                    446:                            if (ai->ai_addrlen <=
                    447:                                sizeof(statp->nsaddr_list[nserv])) {
                    448:                                memcpy(&statp->nsaddr_list[nserv],
                    449:                                    ai->ai_addr, ai->ai_addrlen);
                    450:                            } else
                    451:                                statp->nsaddr_list[nserv].sin_family = 0;
                    452:                            freeaddrinfo(ai);
                    453:                            nserv++;
                    454:                        }
                    455:                    }
                    456:                    continue;
                    457:                }
1.14      christos  458: #ifdef RESOLVSORT
1.1       christos  459:                if (MATCH(buf, "sortlist")) {
                    460:                    struct in_addr a;
                    461:
                    462:                    cp = buf + sizeof("sortlist") - 1;
                    463:                    while (nsort < MAXRESOLVSORT) {
                    464:                        while (*cp == ' ' || *cp == '\t')
                    465:                            cp++;
                    466:                        if (*cp == '\0' || *cp == '\n' || *cp == ';')
                    467:                            break;
                    468:                        net = cp;
                    469:                        while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
                    470:                               isascii(*cp) && !isspace((unsigned char)*cp))
                    471:                                cp++;
                    472:                        n = *cp;
                    473:                        *cp = 0;
                    474:                        if (inet_aton(net, &a)) {
                    475:                            statp->sort_list[nsort].addr = a;
                    476:                            if (ISSORTMASK(n)) {
                    477:                                *cp++ = n;
                    478:                                net = cp;
                    479:                                while (*cp && *cp != ';' &&
                    480:                                        isascii(*cp) &&
                    481:                                        !isspace((unsigned char)*cp))
                    482:                                    cp++;
                    483:                                n = *cp;
                    484:                                *cp = 0;
                    485:                                if (inet_aton(net, &a)) {
                    486:                                    statp->sort_list[nsort].mask = a.s_addr;
                    487:                                } else {
                    488:                                    statp->sort_list[nsort].mask =
                    489:                                        net_mask(statp->sort_list[nsort].addr);
                    490:                                }
                    491:                            } else {
                    492:                                statp->sort_list[nsort].mask =
                    493:                                    net_mask(statp->sort_list[nsort].addr);
                    494:                            }
                    495:                            nsort++;
                    496:                        }
                    497:                        *cp = n;
                    498:                    }
                    499:                    continue;
                    500:                }
1.14      christos  501: #endif
1.1       christos  502:                if (MATCH(buf, "options")) {
                    503:                    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
                    504:                    continue;
                    505:                }
                    506:            }
                    507:            if (nserv > 0)
                    508:                statp->nscount = nserv;
1.14      christos  509: #ifdef RESOLVSORT
1.1       christos  510:            statp->nsort = nsort;
1.14      christos  511: #endif
1.31      christos  512:            statp->_u._ext.ext->resfd = fcntl(fileno(fp), F_DUPFD_CLOEXEC, 0);
1.1       christos  513:            (void) fclose(fp);
1.21      christos  514:            if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
                    515:                    __res_conf_time = statp->_u._ext.ext->res_conf_time =
                    516:                        st.st_mtimespec;
1.32    ! christos  517:            __res_kqinit(statp);
1.21      christos  518:        } else {
                    519:            statp->_u._ext.ext->kq = -1;
                    520:            statp->_u._ext.ext->resfd = -1;
1.1       christos  521:        }
                    522: /*
                    523:  * Last chance to get a nameserver.  This should not normally
                    524:  * be necessary
                    525:  */
                    526: #ifdef NO_RESOLV_CONF
                    527:        if(nserv == 0)
                    528:                nserv = get_nameservers(statp);
                    529: #endif
                    530:
                    531:        if (statp->defdname[0] == 0 &&
                    532:            gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
                    533:            (cp = strchr(buf, '.')) != NULL)
                    534:                strcpy(statp->defdname, cp + 1);
                    535:
                    536:        /* find components of local domain that might be searched */
                    537:        if (havesearch == 0) {
                    538:                pp = statp->dnsrch;
                    539:                *pp++ = statp->defdname;
                    540:                *pp = NULL;
                    541:
                    542:                dots = 0;
                    543:                for (cp = statp->defdname; *cp; cp++)
                    544:                        dots += (*cp == '.');
                    545:
                    546:                cp = statp->defdname;
                    547:                while (pp < statp->dnsrch + MAXDFLSRCH) {
                    548:                        if (dots < LOCALDOMAINPARTS)
                    549:                                break;
1.9       christos  550:                        cp = strchr(cp, '.') + 1;    /*%< we know there is one */
1.1       christos  551:                        *pp++ = cp;
                    552:                        dots--;
                    553:                }
                    554:                *pp = NULL;
                    555: #ifdef DEBUG
                    556:                if (statp->options & RES_DEBUG) {
                    557:                        printf(";; res_init()... default dnsrch list:\n");
                    558:                        for (pp = statp->dnsrch; *pp; pp++)
                    559:                                printf(";;\t%s\n", *pp);
                    560:                        printf(";;\t..END..\n");
                    561:                }
                    562: #endif
                    563:        }
                    564:
                    565:        if ((cp = getenv("RES_OPTIONS")) != NULL)
                    566:                res_setoptions(statp, cp, "env");
                    567:        statp->options |= RES_INIT;
1.14      christos  568:        return (statp->res_h_errno);
1.1       christos  569: }
                    570:
1.22      christos  571: int
                    572: res_check(res_state statp, struct timespec *mtime)
1.21      christos  573: {
                    574:        /*
                    575:         * If the times are equal, then we check if there
                    576:         * was a kevent related to resolv.conf and reload.
                    577:         * If the times are not equal, then we don't bother
                    578:         * to check the kevent, because another thread already
                    579:         * did, loaded and changed the time.
                    580:         */
                    581:        if (timespeccmp(&statp->_u._ext.ext->res_conf_time,
                    582:            &__res_conf_time, ==)) {
                    583:                struct kevent ke;
                    584:                if (statp->_u._ext.ext->kq == -1)
1.22      christos  585:                        goto out;
1.32    ! christos  586:                if (statp->_u._ext.ext->kqpid != getpid() &&
        !           587:                    __res_kqinit(statp) == -1)
        !           588:                        goto out;
1.21      christos  589:
                    590:                switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
                    591:                case 0:
                    592:                case -1:
1.22      christos  593: out:
                    594:                        if (mtime)
                    595:                                *mtime = __res_conf_time;
                    596:                        return 0;
1.21      christos  597:                default:
                    598:                        break;
                    599:                }
                    600:        }
                    601:        (void)__res_vinit(statp, 0);
1.22      christos  602:        if (mtime)
                    603:                *mtime = __res_conf_time;
                    604:        return 1;
1.21      christos  605: }
                    606:
1.1       christos  607: static void
                    608: res_setoptions(res_state statp, const char *options, const char *source)
                    609: {
                    610:        const char *cp = options;
                    611:        int i;
1.24      christos  612:        size_t j;
1.1       christos  613:        struct __res_state_ext *ext = statp->_u._ext.ext;
                    614:
                    615: #ifdef DEBUG
                    616:        if (statp->options & RES_DEBUG)
                    617:                printf(";; res_setoptions(\"%s\", \"%s\")...\n",
                    618:                       options, source);
                    619: #endif
                    620:        while (*cp) {
                    621:                /* skip leading and inner runs of spaces */
                    622:                while (*cp == ' ' || *cp == '\t')
                    623:                        cp++;
                    624:                /* search for and process individual options */
                    625:                if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
                    626:                        i = atoi(cp + sizeof("ndots:") - 1);
                    627:                        if (i <= RES_MAXNDOTS)
                    628:                                statp->ndots = i;
                    629:                        else
                    630:                                statp->ndots = RES_MAXNDOTS;
                    631: #ifdef DEBUG
                    632:                        if (statp->options & RES_DEBUG)
                    633:                                printf(";;\tndots=%d\n", statp->ndots);
                    634: #endif
                    635:                } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
                    636:                        i = atoi(cp + sizeof("timeout:") - 1);
                    637:                        if (i <= RES_MAXRETRANS)
                    638:                                statp->retrans = i;
                    639:                        else
                    640:                                statp->retrans = RES_MAXRETRANS;
                    641: #ifdef DEBUG
                    642:                        if (statp->options & RES_DEBUG)
                    643:                                printf(";;\ttimeout=%d\n", statp->retrans);
                    644: #endif
1.9       christos  645: #ifdef SOLARIS2
                    646:                } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
                    647:                        /*
                    648:                         * For backward compatibility, 'retrans' is
                    649:                         * supported as an alias for 'timeout', though
                    650:                         * without an imposed maximum.
                    651:                         */
                    652:                        statp->retrans = atoi(cp + sizeof("retrans:") - 1);
                    653:                } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
                    654:                        /*
                    655:                         * For backward compatibility, 'retry' is
                    656:                         * supported as an alias for 'attempts', though
                    657:                         * without an imposed maximum.
                    658:                         */
                    659:                        statp->retry = atoi(cp + sizeof("retry:") - 1);
                    660: #endif /* SOLARIS2 */
1.1       christos  661:                } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
                    662:                        i = atoi(cp + sizeof("attempts:") - 1);
                    663:                        if (i <= RES_MAXRETRY)
                    664:                                statp->retry = i;
                    665:                        else
                    666:                                statp->retry = RES_MAXRETRY;
                    667: #ifdef DEBUG
                    668:                        if (statp->options & RES_DEBUG)
                    669:                                printf(";;\tattempts=%d\n", statp->retry);
                    670: #endif
                    671:                } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
                    672: #ifdef DEBUG
                    673:                        if (!(statp->options & RES_DEBUG)) {
                    674:                                printf(";; res_setoptions(\"%s\", \"%s\")..\n",
                    675:                                       options, source);
                    676:                                statp->options |= RES_DEBUG;
                    677:                        }
                    678:                        printf(";;\tdebug\n");
                    679: #endif
                    680:                } else if (!strncmp(cp, "no_tld_query",
                    681:                                    sizeof("no_tld_query") - 1) ||
                    682:                           !strncmp(cp, "no-tld-query",
                    683:                                    sizeof("no-tld-query") - 1)) {
                    684:                        statp->options |= RES_NOTLDQUERY;
                    685:                } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
                    686:                        statp->options |= RES_USE_INET6;
                    687:                } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
                    688:                        statp->options |= RES_ROTATE;
                    689:                } else if (!strncmp(cp, "no-check-names",
                    690:                                    sizeof("no-check-names") - 1)) {
                    691:                        statp->options |= RES_NOCHECKNAME;
1.26      christos  692:                } else if (!strncmp(cp, "check-names",
                    693:                                    sizeof("check-names") - 1)) {
                    694:                        statp->options &= ~RES_NOCHECKNAME;
1.1       christos  695:                }
                    696: #ifdef RES_USE_EDNS0
                    697:                else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
                    698:                        statp->options |= RES_USE_EDNS0;
                    699:                }
                    700: #endif
                    701:                else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
                    702:                        statp->options |= RES_USE_DNAME;
                    703:                }
                    704:                else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
                    705:                        if (ext == NULL)
                    706:                                goto skip;
                    707:                        cp += sizeof("nibble:") - 1;
1.24      christos  708:                        j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
                    709:                        strncpy(ext->nsuffix, cp, j);
                    710:                        ext->nsuffix[j] = '\0';
1.1       christos  711:                }
                    712:                else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
                    713:                        if (ext == NULL)
                    714:                                goto skip;
                    715:                        cp += sizeof("nibble2:") - 1;
1.24      christos  716:                        j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
                    717:                        strncpy(ext->nsuffix2, cp, j);
                    718:                        ext->nsuffix2[j] = '\0';
1.1       christos  719:                }
                    720:                else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
                    721:                        cp += sizeof("v6revmode:") - 1;
                    722:                        /* "nibble" and "bitstring" used to be valid */
                    723:                        if (!strncmp(cp, "single", sizeof("single") - 1)) {
                    724:                                statp->options |= RES_NO_NIBBLE2;
                    725:                        } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
                    726:                                statp->options &=
                    727:                                         ~RES_NO_NIBBLE2;
                    728:                        }
                    729:                }
                    730:                else {
                    731:                        /* XXX - print a warning here? */
                    732:                }
                    733:    skip:
                    734:                /* skip to next run of spaces */
                    735:                while (*cp && *cp != ' ' && *cp != '\t')
                    736:                        cp++;
                    737:        }
                    738: }
                    739:
1.14      christos  740: #ifdef RESOLVSORT
1.1       christos  741: /* XXX - should really support CIDR which means explicit masks always. */
1.25      matt      742: static uint32_t
                    743: net_mask(struct in_addr in) /*!< XXX - should really use system's version of this  */
1.1       christos  744: {
1.25      matt      745:        register uint32_t i = ntohl(in.s_addr);
1.1       christos  746:
                    747:        if (IN_CLASSA(i))
                    748:                return (htonl(IN_CLASSA_NET));
                    749:        else if (IN_CLASSB(i))
                    750:                return (htonl(IN_CLASSB_NET));
                    751:        return (htonl(IN_CLASSC_NET));
                    752: }
1.14      christos  753: #endif
1.1       christos  754:
1.20      christos  755: static u_char srnd[16];
                    756:
1.17      christos  757: void
                    758: res_rndinit(res_state statp)
                    759: {
                    760:        struct timeval now;
1.25      matt      761:        uint32_t u32;
                    762:        uint16_t u16;
1.20      christos  763:        u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.17      christos  764:
                    765:        gettimeofday(&now, NULL);
1.25      matt      766:        u32 = (uint32_t)now.tv_sec;
1.20      christos  767:        memcpy(rnd, &u32, 4);
1.17      christos  768:        u32 = now.tv_usec;
1.20      christos  769:        memcpy(rnd + 4, &u32, 4);
1.25      matt      770:        u32 += (uint32_t)now.tv_sec;
1.20      christos  771:        memcpy(rnd + 8, &u32, 4);
1.17      christos  772:        u16 = getpid();
1.20      christos  773:        memcpy(rnd + 12, &u16, 2);
1.17      christos  774: }
                    775:
1.1       christos  776: u_int
1.25      matt      777: res_nrandomid(res_state statp)
                    778: {
1.1       christos  779:        struct timeval now;
1.25      matt      780:        uint16_t u16;
1.17      christos  781:        MD5_CTX ctx;
1.20      christos  782:        u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1       christos  783:
                    784:        gettimeofday(&now, NULL);
1.25      matt      785:        u16 = (uint16_t) (now.tv_sec ^ now.tv_usec);
1.20      christos  786:        memcpy(rnd + 14, &u16, 2);
1.17      christos  787: #ifndef HAVE_MD5
                    788:        MD5_Init(&ctx);
1.20      christos  789:        MD5_Update(&ctx, rnd, 16);
                    790:        MD5_Final(rnd, &ctx);
1.17      christos  791: #else
                    792:        MD5Init(&ctx);
1.20      christos  793:        MD5Update(&ctx, rnd, 16);
                    794:        MD5Final(rnd, &ctx);
1.17      christos  795: #endif
1.20      christos  796:        memcpy(&u16, rnd + 14, 2);
1.17      christos  797:        return ((u_int) u16);
1.1       christos  798: }
                    799:
1.9       christos  800: /*%
1.1       christos  801:  * This routine is for closing the socket if a virtual circuit is used and
                    802:  * the program wants to close it.  This provides support for endhostent()
                    803:  * which expects to close the socket.
                    804:  *
                    805:  * This routine is not expected to be user visible.
                    806:  */
                    807: void
1.25      matt      808: res_nclose(res_state statp)
                    809: {
1.1       christos  810:        int ns;
                    811:
                    812:        if (statp->_vcsock >= 0) {
                    813:                (void) close(statp->_vcsock);
                    814:                statp->_vcsock = -1;
                    815:                statp->_flags &= ~(RES_F_VC | RES_F_CONN);
                    816:        }
                    817:        for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
                    818:                if (statp->_u._ext.nssocks[ns] != -1) {
                    819:                        (void) close(statp->_u._ext.nssocks[ns]);
                    820:                        statp->_u._ext.nssocks[ns] = -1;
                    821:                }
                    822:        }
                    823: }
                    824:
                    825: void
1.25      matt      826: res_ndestroy(res_state statp)
                    827: {
1.32    ! christos  828:        struct __res_state_ext *ext = statp->_u._ext.ext;
1.1       christos  829:        res_nclose(statp);
1.32    ! christos  830:        if (ext != NULL) {
        !           831:                if (ext->kq != -1 && ext->kqpid == getpid())
        !           832:                        (void)close(ext->kq);
        !           833:                if (ext->resfd != -1)
        !           834:                        (void)close(ext->resfd);
        !           835:                free(ext);
1.20      christos  836:                statp->_u._ext.ext = NULL;
                    837:        }
                    838:        if (statp->_rnd != NULL) {
                    839:                free(statp->_rnd);
                    840:                statp->_rnd = NULL;
                    841:        }
1.1       christos  842:        statp->options &= ~RES_INIT;
                    843: }
                    844:
                    845: const char *
1.25      matt      846: res_get_nibblesuffix(res_state statp)
                    847: {
1.1       christos  848:        if (statp->_u._ext.ext)
                    849:                return (statp->_u._ext.ext->nsuffix);
                    850:        return ("ip6.arpa");
                    851: }
                    852:
                    853: const char *
1.25      matt      854: res_get_nibblesuffix2(res_state statp)
                    855: {
1.1       christos  856:        if (statp->_u._ext.ext)
                    857:                return (statp->_u._ext.ext->nsuffix2);
                    858:        return ("ip6.int");
                    859: }
                    860:
                    861: void
1.25      matt      862: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
                    863: {
1.1       christos  864:        int i, nserv;
                    865:        size_t size;
                    866:
                    867:        /* close open servers */
                    868:        res_nclose(statp);
                    869:
                    870:        /* cause rtt times to be forgotten */
                    871:        statp->_u._ext.nscount = 0;
                    872:
                    873:        nserv = 0;
                    874:        for (i = 0; i < cnt && nserv < MAXNS; i++) {
                    875:                switch (set->sin.sin_family) {
                    876:                case AF_INET:
                    877:                        size = sizeof(set->sin);
                    878:                        if (statp->_u._ext.ext)
                    879:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    880:                                        &set->sin, size);
                    881:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    882:                                memcpy(&statp->nsaddr_list[nserv],
                    883:                                        &set->sin, size);
                    884:                        else
                    885:                                statp->nsaddr_list[nserv].sin_family = 0;
                    886:                        nserv++;
                    887:                        break;
                    888:
                    889: #ifdef HAS_INET6_STRUCTS
                    890:                case AF_INET6:
                    891:                        size = sizeof(set->sin6);
                    892:                        if (statp->_u._ext.ext)
                    893:                                memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
                    894:                                        &set->sin6, size);
                    895:                        if (size <= sizeof(statp->nsaddr_list[nserv]))
                    896:                                memcpy(&statp->nsaddr_list[nserv],
                    897:                                        &set->sin6, size);
                    898:                        else
                    899:                                statp->nsaddr_list[nserv].sin_family = 0;
                    900:                        nserv++;
                    901:                        break;
                    902: #endif
                    903:
                    904:                default:
                    905:                        break;
                    906:                }
                    907:                set++;
                    908:        }
                    909:        statp->nscount = nserv;
                    910:
                    911: }
                    912:
                    913: int
1.25      matt      914: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
                    915: {
1.1       christos  916:        int i;
                    917:        size_t size;
1.25      matt      918:        uint16_t family;
1.1       christos  919:
                    920:        for (i = 0; i < statp->nscount && i < cnt; i++) {
                    921:                if (statp->_u._ext.ext)
                    922:                        family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
                    923:                else
                    924:                        family = statp->nsaddr_list[i].sin_family;
                    925:
                    926:                switch (family) {
                    927:                case AF_INET:
                    928:                        size = sizeof(set->sin);
                    929:                        if (statp->_u._ext.ext)
                    930:                                memcpy(&set->sin,
                    931:                                       &statp->_u._ext.ext->nsaddrs[i],
                    932:                                       size);
                    933:                        else
                    934:                                memcpy(&set->sin, &statp->nsaddr_list[i],
                    935:                                       size);
                    936:                        break;
                    937:
                    938: #ifdef HAS_INET6_STRUCTS
                    939:                case AF_INET6:
                    940:                        size = sizeof(set->sin6);
                    941:                        if (statp->_u._ext.ext)
                    942:                                memcpy(&set->sin6,
                    943:                                       &statp->_u._ext.ext->nsaddrs[i],
                    944:                                       size);
                    945:                        else
                    946:                                memcpy(&set->sin6, &statp->nsaddr_list[i],
                    947:                                       size);
                    948:                        break;
                    949: #endif
                    950:
                    951:                default:
                    952:                        set->sin.sin_family = 0;
                    953:                        break;
                    954:                }
                    955:                set++;
                    956:        }
                    957:        return (statp->nscount);
                    958: }
1.9       christos  959:
                    960: /*! \file */

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