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Annotation of src/lib/libc/resolv/res_send.c, Revision 1.20

1.20    ! christos    1: /*     $NetBSD: res_send.c,v 1.19 2009/10/24 05:35:37 christos Exp $   */
1.18      christos    2:
                      3: /*
                      4:  * Portions Copyright (C) 2004-2009  Internet Systems Consortium, Inc. ("ISC")
                      5:  * Portions Copyright (C) 1996-2003  Internet Software Consortium.
                      6:  *
                      7:  * Permission to use, copy, modify, and/or distribute this software for any
                      8:  * purpose with or without fee is hereby granted, provided that the above
                      9:  * copyright notice and this permission notice appear in all copies.
                     10:  *
                     11:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
                     12:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
                     13:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
                     14:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
                     15:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
                     16:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
                     17:  * PERFORMANCE OF THIS SOFTWARE.
                     18:  */
1.1       christos   19:
                     20: /*
                     21:  * Copyright (c) 1985, 1989, 1993
                     22:  *    The Regents of the University of California.  All rights reserved.
1.18      christos   23:  *
1.1       christos   24:  * Redistribution and use in source and binary forms, with or without
                     25:  * modification, are permitted provided that the following conditions
                     26:  * are met:
                     27:  * 1. Redistributions of source code must retain the above copyright
                     28:  *    notice, this list of conditions and the following disclaimer.
                     29:  * 2. Redistributions in binary form must reproduce the above copyright
                     30:  *    notice, this list of conditions and the following disclaimer in the
                     31:  *    documentation and/or other materials provided with the distribution.
                     32:  * 3. All advertising materials mentioning features or use of this software
                     33:  *    must display the following acknowledgement:
                     34:  *     This product includes software developed by the University of
                     35:  *     California, Berkeley and its contributors.
                     36:  * 4. Neither the name of the University nor the names of its contributors
                     37:  *    may be used to endorse or promote products derived from this software
                     38:  *    without specific prior written permission.
1.18      christos   39:  *
1.1       christos   40:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     41:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     42:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     43:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     44:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     45:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     46:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     47:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     48:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     49:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     50:  * SUCH DAMAGE.
                     51:  */
                     52:
                     53: /*
                     54:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
1.18      christos   55:  *
1.1       christos   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, and that
                     59:  * the name of Digital Equipment Corporation not be used in advertising or
                     60:  * publicity pertaining to distribution of the document or software without
                     61:  * specific, written prior permission.
1.18      christos   62:  *
1.1       christos   63:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     64:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     65:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     66:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     67:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     68:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     69:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     70:  * SOFTWARE.
                     71:  */
                     72:
                     73: /*
1.10      christos   74:  * Copyright (c) 2005 by Internet Systems Consortium, Inc. ("ISC")
1.1       christos   75:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     76:  *
                     77:  * Permission to use, copy, modify, and distribute this software for any
                     78:  * purpose with or without fee is hereby granted, provided that the above
                     79:  * copyright notice and this permission notice appear in all copies.
                     80:  *
                     81:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     82:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     83:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     84:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     85:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     86:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     87:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     88:  */
                     89:
1.4       christos   90: #include <sys/cdefs.h>
1.1       christos   91: #if defined(LIBC_SCCS) && !defined(lint)
1.4       christos   92: #ifdef notdef
1.1       christos   93: static const char sccsid[] = "@(#)res_send.c   8.1 (Berkeley) 6/4/93";
1.18      christos   94: static const char rcsid[] = "Id: res_send.c,v 1.22 2009/01/22 23:49:23 tbox Exp";
1.4       christos   95: #else
1.20    ! christos   96: __RCSID("$NetBSD: res_send.c,v 1.19 2009/10/24 05:35:37 christos Exp $");
1.4       christos   97: #endif
1.1       christos   98: #endif /* LIBC_SCCS and not lint */
                     99:
1.10      christos  100: /*! \file
                    101:  * \brief
1.1       christos  102:  * Send query to name server and wait for reply.
                    103:  */
                    104:
1.8       kleink    105: #include "namespace.h"
1.1       christos  106: #include "port_before.h"
                    107: #include "fd_setsize.h"
                    108:
                    109: #include <sys/types.h>
                    110: #include <sys/param.h>
                    111: #include <sys/time.h>
                    112: #include <sys/socket.h>
                    113: #include <sys/uio.h>
                    114:
                    115: #include <netinet/in.h>
                    116: #include <arpa/nameser.h>
                    117: #include <arpa/inet.h>
                    118:
                    119: #include <errno.h>
                    120: #include <netdb.h>
                    121: #include <resolv.h>
                    122: #include <signal.h>
                    123: #include <stdio.h>
                    124: #include <stdlib.h>
                    125: #include <string.h>
                    126: #include <unistd.h>
                    127:
                    128: #include <isc/eventlib.h>
                    129:
                    130: #include "port_after.h"
                    131:
1.6       christos  132: #if 0
1.5       christos  133: #ifdef __weak_alias
                    134: __weak_alias(res_ourserver_p,__res_ourserver_p)
                    135: __weak_alias(res_nameinquery,__res_nameinquery)
                    136: __weak_alias(res_queriesmatch,__res_queriesmatch)
                    137: __weak_alias(res_nsend,__res_nsend)
                    138: #endif
1.6       christos  139: #endif
1.5       christos  140:
1.10      christos  141:
                    142: #ifdef USE_POLL
                    143: #ifdef HAVE_STROPTS_H
                    144: #include <stropts.h>
                    145: #endif
                    146: #include <poll.h>
                    147: #endif /* USE_POLL */
                    148:
1.1       christos  149: /* Options.  Leave them on. */
1.15      christos  150: #ifndef DEBUG
1.1       christos  151: #define DEBUG
1.15      christos  152: #endif
1.1       christos  153: #include "res_debug.h"
                    154: #include "res_private.h"
                    155:
                    156: #define EXT(res) ((res)->_u._ext)
                    157:
1.10      christos  158: #ifndef USE_POLL
1.1       christos  159: static const int highestFD = FD_SETSIZE - 1;
1.14      christos  160: #else
                    161: static int highestFD = 0;
1.10      christos  162: #endif
1.1       christos  163:
                    164: /* Forward. */
                    165:
                    166: static int             get_salen __P((const struct sockaddr *));
                    167: static struct sockaddr * get_nsaddr __P((res_state, size_t));
                    168: static int             send_vc(res_state, const u_char *, int,
                    169:                                u_char *, int, int *, int);
                    170: static int             send_dg(res_state, const u_char *, int,
1.10      christos  171:                                u_char *, int, int *, int, int,
1.1       christos  172:                                int *, int *);
                    173: static void            Aerror(const res_state, FILE *, const char *, int,
                    174:                               const struct sockaddr *, int);
                    175: static void            Perror(const res_state, FILE *, const char *, int);
                    176: static int             sock_eq(struct sockaddr *, struct sockaddr *);
1.10      christos  177: #if defined(NEED_PSELECT) && !defined(USE_POLL)
1.1       christos  178: static int             pselect(int, void *, void *, void *,
                    179:                                struct timespec *,
                    180:                                const sigset_t *);
                    181: #endif
                    182: void res_pquery(const res_state, const u_char *, int, FILE *);
                    183:
                    184: static const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
                    185:
                    186: /* Public. */
                    187:
1.10      christos  188: /*%
1.1       christos  189:  *     looks up "ina" in _res.ns_addr_list[]
1.10      christos  190:  *
1.1       christos  191:  * returns:
1.10      christos  192:  *\li  0  : not found
                    193:  *\li  >0 : found
                    194:  *
1.1       christos  195:  * author:
1.10      christos  196:  *\li  paul vixie, 29may94
1.1       christos  197:  */
                    198: int
                    199: res_ourserver_p(const res_state statp, const struct sockaddr *sa) {
                    200:        const struct sockaddr_in *inp, *srv;
                    201:        const struct sockaddr_in6 *in6p, *srv6;
                    202:        int ns;
                    203:
                    204:        switch (sa->sa_family) {
                    205:        case AF_INET:
1.3       christos  206:                inp = (const struct sockaddr_in *)(const void *)sa;
1.1       christos  207:                for (ns = 0;  ns < statp->nscount;  ns++) {
1.2       christos  208:                        srv = (struct sockaddr_in *)(void *)get_nsaddr(statp, (size_t)ns);
1.1       christos  209:                        if (srv->sin_family == inp->sin_family &&
                    210:                            srv->sin_port == inp->sin_port &&
                    211:                            (srv->sin_addr.s_addr == INADDR_ANY ||
                    212:                             srv->sin_addr.s_addr == inp->sin_addr.s_addr))
                    213:                                return (1);
                    214:                }
                    215:                break;
                    216:        case AF_INET6:
                    217:                if (EXT(statp).ext == NULL)
                    218:                        break;
1.3       christos  219:                in6p = (const struct sockaddr_in6 *)(const void *)sa;
1.1       christos  220:                for (ns = 0;  ns < statp->nscount;  ns++) {
1.2       christos  221:                        srv6 = (struct sockaddr_in6 *)(void *)get_nsaddr(statp, (size_t)ns);
1.1       christos  222:                        if (srv6->sin6_family == in6p->sin6_family &&
                    223:                            srv6->sin6_port == in6p->sin6_port &&
                    224: #ifdef HAVE_SIN6_SCOPE_ID
1.7       christos  225:                            (srv6->sin6_scope_id == 0 ||
                    226:                             srv6->sin6_scope_id == in6p->sin6_scope_id) &&
1.1       christos  227: #endif
                    228:                            (IN6_IS_ADDR_UNSPECIFIED(&srv6->sin6_addr) ||
                    229:                             IN6_ARE_ADDR_EQUAL(&srv6->sin6_addr, &in6p->sin6_addr)))
                    230:                                return (1);
                    231:                }
                    232:                break;
                    233:        default:
                    234:                break;
                    235:        }
                    236:        return (0);
                    237: }
                    238:
1.10      christos  239: /*%
1.1       christos  240:  *     look for (name,type,class) in the query section of packet (buf,eom)
1.10      christos  241:  *
1.1       christos  242:  * requires:
1.10      christos  243:  *\li  buf + HFIXEDSZ <= eom
                    244:  *
1.1       christos  245:  * returns:
1.10      christos  246:  *\li  -1 : format error
                    247:  *\li  0  : not found
                    248:  *\li  >0 : found
                    249:  *
1.1       christos  250:  * author:
1.10      christos  251:  *\li  paul vixie, 29may94
1.1       christos  252:  */
                    253: int
                    254: res_nameinquery(const char *name, int type, int class,
                    255:                const u_char *buf, const u_char *eom)
                    256: {
                    257:        const u_char *cp = buf + HFIXEDSZ;
1.2       christos  258:        int qdcount = ntohs(((const HEADER*)(const void *)buf)->qdcount);
1.1       christos  259:
                    260:        while (qdcount-- > 0) {
                    261:                char tname[MAXDNAME+1];
                    262:                int n, ttype, tclass;
                    263:
                    264:                n = dn_expand(buf, eom, cp, tname, sizeof tname);
                    265:                if (n < 0)
                    266:                        return (-1);
                    267:                cp += n;
                    268:                if (cp + 2 * INT16SZ > eom)
                    269:                        return (-1);
                    270:                ttype = ns_get16(cp); cp += INT16SZ;
                    271:                tclass = ns_get16(cp); cp += INT16SZ;
                    272:                if (ttype == type && tclass == class &&
                    273:                    ns_samename(tname, name) == 1)
                    274:                        return (1);
                    275:        }
                    276:        return (0);
                    277: }
                    278:
1.10      christos  279: /*%
1.1       christos  280:  *     is there a 1:1 mapping of (name,type,class)
                    281:  *     in (buf1,eom1) and (buf2,eom2)?
1.10      christos  282:  *
1.1       christos  283:  * returns:
1.10      christos  284:  *\li  -1 : format error
                    285:  *\li  0  : not a 1:1 mapping
                    286:  *\li  >0 : is a 1:1 mapping
                    287:  *
1.1       christos  288:  * author:
1.10      christos  289:  *\li  paul vixie, 29may94
1.1       christos  290:  */
                    291: int
                    292: res_queriesmatch(const u_char *buf1, const u_char *eom1,
                    293:                 const u_char *buf2, const u_char *eom2)
                    294: {
                    295:        const u_char *cp = buf1 + HFIXEDSZ;
1.2       christos  296:        int qdcount = ntohs(((const HEADER*)(const void *)buf1)->qdcount);
1.1       christos  297:
                    298:        if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
                    299:                return (-1);
                    300:
                    301:        /*
                    302:         * Only header section present in replies to
                    303:         * dynamic update packets.
                    304:         */
1.2       christos  305:        if ((((const HEADER *)(const void *)buf1)->opcode == ns_o_update) &&
                    306:            (((const HEADER *)(const void *)buf2)->opcode == ns_o_update))
1.1       christos  307:                return (1);
                    308:
1.2       christos  309:        if (qdcount != ntohs(((const HEADER*)(const void *)buf2)->qdcount))
1.1       christos  310:                return (0);
                    311:        while (qdcount-- > 0) {
                    312:                char tname[MAXDNAME+1];
                    313:                int n, ttype, tclass;
                    314:
                    315:                n = dn_expand(buf1, eom1, cp, tname, sizeof tname);
                    316:                if (n < 0)
                    317:                        return (-1);
                    318:                cp += n;
                    319:                if (cp + 2 * INT16SZ > eom1)
                    320:                        return (-1);
                    321:                ttype = ns_get16(cp);   cp += INT16SZ;
                    322:                tclass = ns_get16(cp); cp += INT16SZ;
                    323:                if (!res_nameinquery(tname, ttype, tclass, buf2, eom2))
                    324:                        return (0);
                    325:        }
                    326:        return (1);
                    327: }
                    328:
                    329: int
                    330: res_nsend(res_state statp,
                    331:          const u_char *buf, int buflen, u_char *ans, int anssiz)
                    332: {
1.14      christos  333:        int gotsomewhere, terrno, tries, v_circuit, resplen, ns, n;
1.1       christos  334:        char abuf[NI_MAXHOST];
                    335:
1.14      christos  336: #ifdef USE_POLL
                    337:        highestFD = sysconf(_SC_OPEN_MAX) - 1;
                    338: #endif
                    339:
1.20    ! christos  340:        (void)res_check(statp, NULL);
1.19      christos  341:
1.10      christos  342:        /* No name servers or res_init() failure */
                    343:        if (statp->nscount == 0 || EXT(statp).ext == NULL) {
1.1       christos  344:                errno = ESRCH;
                    345:                return (-1);
                    346:        }
                    347:        if (anssiz < HFIXEDSZ) {
                    348:                errno = EINVAL;
                    349:                return (-1);
                    350:        }
                    351:        DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY),
                    352:                (stdout, ";; res_send()\n"), buf, buflen);
                    353:        v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ;
                    354:        gotsomewhere = 0;
                    355:        terrno = ETIMEDOUT;
                    356:
                    357:        /*
                    358:         * If the ns_addr_list in the resolver context has changed, then
                    359:         * invalidate our cached copy and the associated timing data.
                    360:         */
                    361:        if (EXT(statp).nscount != 0) {
                    362:                int needclose = 0;
                    363:                struct sockaddr_storage peer;
                    364:                ISC_SOCKLEN_T peerlen;
                    365:
                    366:                if (EXT(statp).nscount != statp->nscount)
                    367:                        needclose++;
                    368:                else
                    369:                        for (ns = 0; ns < statp->nscount; ns++) {
                    370:                                if (statp->nsaddr_list[ns].sin_family &&
1.2       christos  371:                                    !sock_eq((struct sockaddr *)(void *)&statp->nsaddr_list[ns],
                    372:                                             (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[ns])) {
1.1       christos  373:                                        needclose++;
                    374:                                        break;
                    375:                                }
                    376:
                    377:                                if (EXT(statp).nssocks[ns] == -1)
                    378:                                        continue;
                    379:                                peerlen = sizeof(peer);
1.17      mrg       380:                                if (getpeername(EXT(statp).nssocks[ns],
1.2       christos  381:                                    (struct sockaddr *)(void *)&peer, &peerlen) < 0) {
1.1       christos  382:                                        needclose++;
                    383:                                        break;
                    384:                                }
1.2       christos  385:                                if (!sock_eq((struct sockaddr *)(void *)&peer,
                    386:                                    get_nsaddr(statp, (size_t)ns))) {
1.1       christos  387:                                        needclose++;
                    388:                                        break;
                    389:                                }
                    390:                        }
                    391:                if (needclose) {
                    392:                        res_nclose(statp);
                    393:                        EXT(statp).nscount = 0;
                    394:                }
                    395:        }
                    396:
                    397:        /*
                    398:         * Maybe initialize our private copy of the ns_addr_list.
                    399:         */
                    400:        if (EXT(statp).nscount == 0) {
                    401:                for (ns = 0; ns < statp->nscount; ns++) {
                    402:                        EXT(statp).nstimes[ns] = RES_MAXTIME;
                    403:                        EXT(statp).nssocks[ns] = -1;
                    404:                        if (!statp->nsaddr_list[ns].sin_family)
                    405:                                continue;
                    406:                        EXT(statp).ext->nsaddrs[ns].sin =
                    407:                                 statp->nsaddr_list[ns];
                    408:                }
                    409:                EXT(statp).nscount = statp->nscount;
                    410:        }
                    411:
                    412:        /*
                    413:         * Some resolvers want to even out the load on their nameservers.
                    414:         * Note that RES_BLAST overrides RES_ROTATE.
                    415:         */
                    416:        if ((statp->options & RES_ROTATE) != 0U &&
                    417:            (statp->options & RES_BLAST) == 0U) {
                    418:                union res_sockaddr_union inu;
                    419:                struct sockaddr_in ina;
                    420:                int lastns = statp->nscount - 1;
                    421:                int fd;
                    422:                u_int16_t nstime;
                    423:
                    424:                if (EXT(statp).ext != NULL)
                    425:                        inu = EXT(statp).ext->nsaddrs[0];
                    426:                ina = statp->nsaddr_list[0];
                    427:                fd = EXT(statp).nssocks[0];
                    428:                nstime = EXT(statp).nstimes[0];
                    429:                for (ns = 0; ns < lastns; ns++) {
                    430:                        if (EXT(statp).ext != NULL)
1.18      christos  431:                                EXT(statp).ext->nsaddrs[ns] =
1.1       christos  432:                                        EXT(statp).ext->nsaddrs[ns + 1];
                    433:                        statp->nsaddr_list[ns] = statp->nsaddr_list[ns + 1];
                    434:                        EXT(statp).nssocks[ns] = EXT(statp).nssocks[ns + 1];
                    435:                        EXT(statp).nstimes[ns] = EXT(statp).nstimes[ns + 1];
                    436:                }
                    437:                if (EXT(statp).ext != NULL)
                    438:                        EXT(statp).ext->nsaddrs[lastns] = inu;
                    439:                statp->nsaddr_list[lastns] = ina;
                    440:                EXT(statp).nssocks[lastns] = fd;
                    441:                EXT(statp).nstimes[lastns] = nstime;
                    442:        }
                    443:
                    444:        /*
                    445:         * Send request, RETRY times, or until successful.
                    446:         */
1.14      christos  447:        for (tries = 0; tries < statp->retry; tries++) {
1.1       christos  448:            for (ns = 0; ns < statp->nscount; ns++) {
                    449:                struct sockaddr *nsap;
                    450:                int nsaplen;
1.2       christos  451:                nsap = get_nsaddr(statp, (size_t)ns);
1.1       christos  452:                nsaplen = get_salen(nsap);
                    453:                statp->_flags &= ~RES_F_LASTMASK;
                    454:                statp->_flags |= (ns << RES_F_LASTSHIFT);
                    455:  same_ns:
                    456:                if (statp->qhook) {
                    457:                        int done = 0, loops = 0;
                    458:
                    459:                        do {
                    460:                                res_sendhookact act;
                    461:
                    462:                                act = (*statp->qhook)(&nsap, &buf, &buflen,
                    463:                                                      ans, anssiz, &resplen);
                    464:                                switch (act) {
                    465:                                case res_goahead:
                    466:                                        done = 1;
                    467:                                        break;
                    468:                                case res_nextns:
                    469:                                        res_nclose(statp);
                    470:                                        goto next_ns;
                    471:                                case res_done:
                    472:                                        return (resplen);
                    473:                                case res_modified:
                    474:                                        /* give the hook another try */
                    475:                                        if (++loops < 42) /*doug adams*/
                    476:                                                break;
                    477:                                        /*FALLTHROUGH*/
                    478:                                case res_error:
                    479:                                        /*FALLTHROUGH*/
                    480:                                default:
                    481:                                        goto fail;
                    482:                                }
                    483:                        } while (!done);
                    484:                }
                    485:
                    486:                Dprint(((statp->options & RES_DEBUG) &&
1.2       christos  487:                        getnameinfo(nsap, (socklen_t)nsaplen, abuf, sizeof(abuf),
1.1       christos  488:                                    NULL, 0, niflags) == 0),
                    489:                       (stdout, ";; Querying server (# %d) address = %s\n",
                    490:                        ns + 1, abuf));
                    491:
                    492:
                    493:                if (v_circuit) {
                    494:                        /* Use VC; at most one attempt per server. */
1.14      christos  495:                        tries = statp->retry;
1.1       christos  496:                        n = send_vc(statp, buf, buflen, ans, anssiz, &terrno,
                    497:                                    ns);
                    498:                        if (n < 0)
                    499:                                goto fail;
                    500:                        if (n == 0)
                    501:                                goto next_ns;
                    502:                        resplen = n;
                    503:                } else {
                    504:                        /* Use datagrams. */
                    505:                        n = send_dg(statp, buf, buflen, ans, anssiz, &terrno,
1.14      christos  506:                                    ns, tries, &v_circuit, &gotsomewhere);
1.1       christos  507:                        if (n < 0)
                    508:                                goto fail;
                    509:                        if (n == 0)
                    510:                                goto next_ns;
                    511:                        if (v_circuit)
                    512:                                goto same_ns;
                    513:                        resplen = n;
                    514:                }
                    515:
                    516:                Dprint((statp->options & RES_DEBUG) ||
                    517:                       ((statp->pfcode & RES_PRF_REPLY) &&
                    518:                        (statp->pfcode & RES_PRF_HEAD1)),
                    519:                       (stdout, ";; got answer:\n"));
                    520:
                    521:                DprintQ((statp->options & RES_DEBUG) ||
                    522:                        (statp->pfcode & RES_PRF_REPLY),
                    523:                        (stdout, "%s", ""),
                    524:                        ans, (resplen > anssiz) ? anssiz : resplen);
                    525:
                    526:                /*
                    527:                 * If we have temporarily opened a virtual circuit,
                    528:                 * or if we haven't been asked to keep a socket open,
                    529:                 * close the socket.
                    530:                 */
                    531:                if ((v_circuit && (statp->options & RES_USEVC) == 0U) ||
                    532:                    (statp->options & RES_STAYOPEN) == 0U) {
                    533:                        res_nclose(statp);
                    534:                }
                    535:                if (statp->rhook) {
                    536:                        int done = 0, loops = 0;
                    537:
                    538:                        do {
                    539:                                res_sendhookact act;
                    540:
                    541:                                act = (*statp->rhook)(nsap, buf, buflen,
                    542:                                                      ans, anssiz, &resplen);
                    543:                                switch (act) {
                    544:                                case res_goahead:
                    545:                                case res_done:
                    546:                                        done = 1;
                    547:                                        break;
                    548:                                case res_nextns:
                    549:                                        res_nclose(statp);
                    550:                                        goto next_ns;
                    551:                                case res_modified:
                    552:                                        /* give the hook another try */
                    553:                                        if (++loops < 42) /*doug adams*/
                    554:                                                break;
                    555:                                        /*FALLTHROUGH*/
                    556:                                case res_error:
                    557:                                        /*FALLTHROUGH*/
                    558:                                default:
                    559:                                        goto fail;
                    560:                                }
                    561:                        } while (!done);
                    562:
                    563:                }
                    564:                return (resplen);
                    565:  next_ns: ;
                    566:           } /*foreach ns*/
                    567:        } /*foreach retry*/
                    568:        res_nclose(statp);
                    569:        if (!v_circuit) {
                    570:                if (!gotsomewhere)
1.10      christos  571:                        errno = ECONNREFUSED;   /*%< no nameservers found */
1.1       christos  572:                else
1.10      christos  573:                        errno = ETIMEDOUT;      /*%< no answer obtained */
1.1       christos  574:        } else
                    575:                errno = terrno;
                    576:        return (-1);
                    577:  fail:
                    578:        res_nclose(statp);
                    579:        return (-1);
                    580: }
                    581:
                    582: /* Private */
                    583:
                    584: static int
                    585: get_salen(sa)
                    586:        const struct sockaddr *sa;
                    587: {
                    588:
                    589: #ifdef HAVE_SA_LEN
                    590:        /* There are people do not set sa_len.  Be forgiving to them. */
                    591:        if (sa->sa_len)
                    592:                return (sa->sa_len);
                    593: #endif
                    594:
                    595:        if (sa->sa_family == AF_INET)
                    596:                return (sizeof(struct sockaddr_in));
                    597:        else if (sa->sa_family == AF_INET6)
                    598:                return (sizeof(struct sockaddr_in6));
                    599:        else
1.10      christos  600:                return (0);     /*%< unknown, die on connect */
1.1       christos  601: }
                    602:
1.10      christos  603: /*%
1.1       christos  604:  * pick appropriate nsaddr_list for use.  see res_init() for initialization.
                    605:  */
                    606: static struct sockaddr *
                    607: get_nsaddr(statp, n)
                    608:        res_state statp;
                    609:        size_t n;
                    610: {
                    611:
                    612:        if (!statp->nsaddr_list[n].sin_family && EXT(statp).ext) {
                    613:                /*
                    614:                 * - EXT(statp).ext->nsaddrs[n] holds an address that is larger
                    615:                 *   than struct sockaddr, and
                    616:                 * - user code did not update statp->nsaddr_list[n].
                    617:                 */
                    618:                return (struct sockaddr *)(void *)&EXT(statp).ext->nsaddrs[n];
                    619:        } else {
                    620:                /*
                    621:                 * - user code updated statp->nsaddr_list[n], or
                    622:                 * - statp->nsaddr_list[n] has the same content as
                    623:                 *   EXT(statp).ext->nsaddrs[n].
                    624:                 */
                    625:                return (struct sockaddr *)(void *)&statp->nsaddr_list[n];
                    626:        }
                    627: }
                    628:
                    629: static int
                    630: send_vc(res_state statp,
                    631:        const u_char *buf, int buflen, u_char *ans, int anssiz,
                    632:        int *terrno, int ns)
                    633: {
1.3       christos  634:        const HEADER *hp = (const HEADER *)(const void *)buf;
                    635:        HEADER *anhp = (HEADER *)(void *)ans;
1.1       christos  636:        struct sockaddr *nsap;
                    637:        int nsaplen;
                    638:        int truncating, connreset, resplen, n;
                    639:        struct iovec iov[2];
                    640:        u_short len;
                    641:        u_char *cp;
                    642:        void *tmp;
1.14      christos  643: #ifdef SO_NOSIGPIPE
                    644:        int on = 1;
                    645: #endif
1.1       christos  646:
1.2       christos  647:        nsap = get_nsaddr(statp, (size_t)ns);
1.1       christos  648:        nsaplen = get_salen(nsap);
                    649:
                    650:        connreset = 0;
                    651:  same_ns:
                    652:        truncating = 0;
                    653:
                    654:        /* Are we still talking to whom we want to talk to? */
                    655:        if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) {
                    656:                struct sockaddr_storage peer;
                    657:                ISC_SOCKLEN_T size = sizeof peer;
                    658:
                    659:                if (getpeername(statp->_vcsock,
1.2       christos  660:                                (struct sockaddr *)(void *)&peer, &size) < 0 ||
                    661:                    !sock_eq((struct sockaddr *)(void *)&peer, nsap)) {
1.1       christos  662:                        res_nclose(statp);
                    663:                        statp->_flags &= ~RES_F_VC;
                    664:                }
                    665:        }
                    666:
                    667:        if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) {
                    668:                if (statp->_vcsock >= 0)
                    669:                        res_nclose(statp);
                    670:
                    671:                statp->_vcsock = socket(nsap->sa_family, SOCK_STREAM, 0);
                    672:                if (statp->_vcsock > highestFD) {
                    673:                        res_nclose(statp);
                    674:                        errno = ENOTSOCK;
                    675:                }
                    676:                if (statp->_vcsock < 0) {
                    677:                        switch (errno) {
                    678:                        case EPROTONOSUPPORT:
                    679: #ifdef EPFNOSUPPORT
                    680:                        case EPFNOSUPPORT:
                    681: #endif
                    682:                        case EAFNOSUPPORT:
                    683:                                Perror(statp, stderr, "socket(vc)", errno);
                    684:                                return (0);
                    685:                        default:
                    686:                                *terrno = errno;
                    687:                                Perror(statp, stderr, "socket(vc)", errno);
                    688:                                return (-1);
                    689:                        }
                    690:                }
1.14      christos  691: #ifdef SO_NOSIGPIPE
                    692:                /*
                    693:                 * Disable generation of SIGPIPE when writing to a closed
                    694:                 * socket.  Write should return -1 and set errno to EPIPE
1.18      christos  695:                 * instead.
1.14      christos  696:                 *
                    697:                 * Push on even if setsockopt(SO_NOSIGPIPE) fails.
                    698:                 */
                    699:                (void)setsockopt(statp->_vcsock, SOL_SOCKET, SO_NOSIGPIPE, &on,
1.18      christos  700:                                 sizeof(on));
1.14      christos  701: #endif
1.1       christos  702:                errno = 0;
1.2       christos  703:                if (connect(statp->_vcsock, nsap, (socklen_t)nsaplen) < 0) {
1.1       christos  704:                        *terrno = errno;
                    705:                        Aerror(statp, stderr, "connect/vc", errno, nsap,
                    706:                            nsaplen);
                    707:                        res_nclose(statp);
                    708:                        return (0);
                    709:                }
                    710:                statp->_flags |= RES_F_VC;
                    711:        }
                    712:
                    713:        /*
                    714:         * Send length & message
                    715:         */
1.2       christos  716:        ns_put16((u_short)buflen, (u_char*)(void *)&len);
1.1       christos  717:        iov[0] = evConsIovec(&len, INT16SZ);
                    718:        DE_CONST(buf, tmp);
1.2       christos  719:        iov[1] = evConsIovec(tmp, (size_t)buflen);
1.1       christos  720:        if (writev(statp->_vcsock, iov, 2) != (INT16SZ + buflen)) {
                    721:                *terrno = errno;
                    722:                Perror(statp, stderr, "write failed", errno);
                    723:                res_nclose(statp);
                    724:                return (0);
                    725:        }
                    726:        /*
                    727:         * Receive length & response
                    728:         */
                    729:  read_len:
                    730:        cp = ans;
                    731:        len = INT16SZ;
1.2       christos  732:        while ((n = read(statp->_vcsock, (char *)cp, (size_t)len)) > 0) {
1.1       christos  733:                cp += n;
1.2       christos  734:                if ((len -= n) == 0)
1.1       christos  735:                        break;
                    736:        }
                    737:        if (n <= 0) {
                    738:                *terrno = errno;
                    739:                Perror(statp, stderr, "read failed", errno);
                    740:                res_nclose(statp);
                    741:                /*
                    742:                 * A long running process might get its TCP
                    743:                 * connection reset if the remote server was
                    744:                 * restarted.  Requery the server instead of
                    745:                 * trying a new one.  When there is only one
                    746:                 * server, this means that a query might work
                    747:                 * instead of failing.  We only allow one reset
                    748:                 * per query to prevent looping.
                    749:                 */
                    750:                if (*terrno == ECONNRESET && !connreset) {
                    751:                        connreset = 1;
                    752:                        res_nclose(statp);
                    753:                        goto same_ns;
                    754:                }
                    755:                res_nclose(statp);
                    756:                return (0);
                    757:        }
                    758:        resplen = ns_get16(ans);
                    759:        if (resplen > anssiz) {
                    760:                Dprint(statp->options & RES_DEBUG,
                    761:                       (stdout, ";; response truncated\n")
                    762:                       );
                    763:                truncating = 1;
                    764:                len = anssiz;
                    765:        } else
                    766:                len = resplen;
                    767:        if (len < HFIXEDSZ) {
                    768:                /*
                    769:                 * Undersized message.
                    770:                 */
                    771:                Dprint(statp->options & RES_DEBUG,
                    772:                       (stdout, ";; undersized: %d\n", len));
                    773:                *terrno = EMSGSIZE;
                    774:                res_nclose(statp);
                    775:                return (0);
                    776:        }
                    777:        cp = ans;
1.2       christos  778:        while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (size_t)len)) > 0){
1.1       christos  779:                cp += n;
                    780:                len -= n;
                    781:        }
                    782:        if (n <= 0) {
                    783:                *terrno = errno;
                    784:                Perror(statp, stderr, "read(vc)", errno);
                    785:                res_nclose(statp);
                    786:                return (0);
                    787:        }
                    788:        if (truncating) {
                    789:                /*
                    790:                 * Flush rest of answer so connection stays in synch.
                    791:                 */
                    792:                anhp->tc = 1;
                    793:                len = resplen - anssiz;
                    794:                while (len != 0) {
                    795:                        char junk[PACKETSZ];
                    796:
                    797:                        n = read(statp->_vcsock, junk,
                    798:                                 (len > sizeof junk) ? sizeof junk : len);
                    799:                        if (n > 0)
                    800:                                len -= n;
                    801:                        else
                    802:                                break;
                    803:                }
                    804:        }
                    805:        /*
                    806:         * If the calling applicating has bailed out of
                    807:         * a previous call and failed to arrange to have
                    808:         * the circuit closed or the server has got
                    809:         * itself confused, then drop the packet and
                    810:         * wait for the correct one.
                    811:         */
                    812:        if (hp->id != anhp->id) {
                    813:                DprintQ((statp->options & RES_DEBUG) ||
                    814:                        (statp->pfcode & RES_PRF_REPLY),
                    815:                        (stdout, ";; old answer (unexpected):\n"),
                    816:                        ans, (resplen > anssiz) ? anssiz: resplen);
                    817:                goto read_len;
                    818:        }
                    819:
                    820:        /*
                    821:         * All is well, or the error is fatal.  Signal that the
                    822:         * next nameserver ought not be tried.
                    823:         */
                    824:        return (resplen);
                    825: }
                    826:
                    827: static int
1.10      christos  828: send_dg(res_state statp, const u_char *buf, int buflen, u_char *ans,
1.14      christos  829:        int anssiz, int *terrno, int ns, int tries, int *v_circuit,
1.10      christos  830:        int *gotsomewhere)
1.1       christos  831: {
1.2       christos  832:        const HEADER *hp = (const HEADER *)(const void *)buf;
                    833:        HEADER *anhp = (HEADER *)(void *)ans;
1.1       christos  834:        const struct sockaddr *nsap;
                    835:        int nsaplen;
                    836:        struct timespec now, timeout, finish;
                    837:        struct sockaddr_storage from;
                    838:        ISC_SOCKLEN_T fromlen;
                    839:        int resplen, seconds, n, s;
1.10      christos  840: #ifdef USE_POLL
                    841:        int     polltimeout;
                    842:        struct pollfd   pollfd;
                    843: #else
                    844:        fd_set dsmask;
                    845: #endif
1.1       christos  846:
1.2       christos  847:        nsap = get_nsaddr(statp, (size_t)ns);
1.1       christos  848:        nsaplen = get_salen(nsap);
                    849:        if (EXT(statp).nssocks[ns] == -1) {
                    850:                EXT(statp).nssocks[ns] = socket(nsap->sa_family, SOCK_DGRAM, 0);
                    851:                if (EXT(statp).nssocks[ns] > highestFD) {
                    852:                        res_nclose(statp);
                    853:                        errno = ENOTSOCK;
                    854:                }
                    855:                if (EXT(statp).nssocks[ns] < 0) {
                    856:                        switch (errno) {
                    857:                        case EPROTONOSUPPORT:
                    858: #ifdef EPFNOSUPPORT
                    859:                        case EPFNOSUPPORT:
                    860: #endif
                    861:                        case EAFNOSUPPORT:
                    862:                                Perror(statp, stderr, "socket(dg)", errno);
                    863:                                return (0);
                    864:                        default:
                    865:                                *terrno = errno;
                    866:                                Perror(statp, stderr, "socket(dg)", errno);
                    867:                                return (-1);
                    868:                        }
                    869:                }
                    870: #ifndef CANNOT_CONNECT_DGRAM
                    871:                /*
                    872:                 * On a 4.3BSD+ machine (client and server,
                    873:                 * actually), sending to a nameserver datagram
                    874:                 * port with no nameserver will cause an
                    875:                 * ICMP port unreachable message to be returned.
                    876:                 * If our datagram socket is "connected" to the
                    877:                 * server, we get an ECONNREFUSED error on the next
                    878:                 * socket operation, and select returns if the
                    879:                 * error message is received.  We can thus detect
                    880:                 * the absence of a nameserver without timing out.
                    881:                 */
1.2       christos  882:                if (connect(EXT(statp).nssocks[ns], nsap, (socklen_t)nsaplen) < 0) {
1.1       christos  883:                        Aerror(statp, stderr, "connect(dg)", errno, nsap,
                    884:                            nsaplen);
                    885:                        res_nclose(statp);
                    886:                        return (0);
                    887:                }
                    888: #endif /* !CANNOT_CONNECT_DGRAM */
                    889:                Dprint(statp->options & RES_DEBUG,
                    890:                       (stdout, ";; new DG socket\n"))
                    891:        }
                    892:        s = EXT(statp).nssocks[ns];
                    893: #ifndef CANNOT_CONNECT_DGRAM
1.2       christos  894:        if (send(s, (const char*)buf, (size_t)buflen, 0) != buflen) {
1.1       christos  895:                Perror(statp, stderr, "send", errno);
                    896:                res_nclose(statp);
                    897:                return (0);
                    898:        }
                    899: #else /* !CANNOT_CONNECT_DGRAM */
                    900:        if (sendto(s, (const char*)buf, buflen, 0, nsap, nsaplen) != buflen)
                    901:        {
                    902:                Aerror(statp, stderr, "sendto", errno, nsap, nsaplen);
                    903:                res_nclose(statp);
                    904:                return (0);
                    905:        }
                    906: #endif /* !CANNOT_CONNECT_DGRAM */
                    907:
                    908:        /*
                    909:         * Wait for reply.
                    910:         */
1.14      christos  911:        seconds = (statp->retrans << tries);
1.1       christos  912:        if (ns > 0)
                    913:                seconds /= statp->nscount;
                    914:        if (seconds <= 0)
                    915:                seconds = 1;
                    916:        now = evNowTime();
1.3       christos  917:        timeout = evConsTime((long)seconds, 0L);
1.1       christos  918:        finish = evAddTime(now, timeout);
                    919:        goto nonow;
                    920:  wait:
                    921:        now = evNowTime();
                    922:  nonow:
1.10      christos  923: #ifndef USE_POLL
1.1       christos  924:        FD_ZERO(&dsmask);
                    925:        FD_SET(s, &dsmask);
                    926:        if (evCmpTime(finish, now) > 0)
                    927:                timeout = evSubTime(finish, now);
                    928:        else
1.3       christos  929:                timeout = evConsTime(0L, 0L);
1.1       christos  930:        n = pselect(s + 1, &dsmask, NULL, NULL, &timeout, NULL);
1.10      christos  931: #else
                    932:        timeout = evSubTime(finish, now);
                    933:        if (timeout.tv_sec < 0)
1.11      christos  934:                timeout = evConsTime(0L, 0L);
1.16      christos  935:        polltimeout = 1000*(int)timeout.tv_sec +
                    936:                (int)timeout.tv_nsec/1000000;
1.10      christos  937:        pollfd.fd = s;
                    938:        pollfd.events = POLLRDNORM;
                    939:        n = poll(&pollfd, 1, polltimeout);
                    940: #endif /* USE_POLL */
                    941:
1.1       christos  942:        if (n == 0) {
                    943:                Dprint(statp->options & RES_DEBUG, (stdout, ";; timeout\n"));
                    944:                *gotsomewhere = 1;
                    945:                return (0);
                    946:        }
                    947:        if (n < 0) {
                    948:                if (errno == EINTR)
                    949:                        goto wait;
1.10      christos  950: #ifndef USE_POLL
1.1       christos  951:                Perror(statp, stderr, "select", errno);
1.10      christos  952: #else
                    953:                Perror(statp, stderr, "poll", errno);
                    954: #endif /* USE_POLL */
1.1       christos  955:                res_nclose(statp);
                    956:                return (0);
                    957:        }
                    958:        errno = 0;
                    959:        fromlen = sizeof(from);
1.2       christos  960:        resplen = recvfrom(s, (char*)ans, (size_t)anssiz,0,
                    961:                           (struct sockaddr *)(void *)&from, &fromlen);
1.1       christos  962:        if (resplen <= 0) {
                    963:                Perror(statp, stderr, "recvfrom", errno);
                    964:                res_nclose(statp);
                    965:                return (0);
                    966:        }
                    967:        *gotsomewhere = 1;
                    968:        if (resplen < HFIXEDSZ) {
                    969:                /*
                    970:                 * Undersized message.
                    971:                 */
                    972:                Dprint(statp->options & RES_DEBUG,
                    973:                       (stdout, ";; undersized: %d\n",
                    974:                        resplen));
                    975:                *terrno = EMSGSIZE;
                    976:                res_nclose(statp);
                    977:                return (0);
                    978:        }
                    979:        if (hp->id != anhp->id) {
                    980:                /*
                    981:                 * response from old query, ignore it.
                    982:                 * XXX - potential security hazard could
                    983:                 *       be detected here.
                    984:                 */
                    985:                DprintQ((statp->options & RES_DEBUG) ||
                    986:                        (statp->pfcode & RES_PRF_REPLY),
                    987:                        (stdout, ";; old answer:\n"),
                    988:                        ans, (resplen > anssiz) ? anssiz : resplen);
                    989:                goto wait;
                    990:        }
                    991:        if (!(statp->options & RES_INSECURE1) &&
1.2       christos  992:            !res_ourserver_p(statp, (struct sockaddr *)(void *)&from)) {
1.1       christos  993:                /*
                    994:                 * response from wrong server? ignore it.
                    995:                 * XXX - potential security hazard could
                    996:                 *       be detected here.
                    997:                 */
                    998:                DprintQ((statp->options & RES_DEBUG) ||
                    999:                        (statp->pfcode & RES_PRF_REPLY),
                   1000:                        (stdout, ";; not our server:\n"),
                   1001:                        ans, (resplen > anssiz) ? anssiz : resplen);
                   1002:                goto wait;
                   1003:        }
                   1004: #ifdef RES_USE_EDNS0
                   1005:        if (anhp->rcode == FORMERR && (statp->options & RES_USE_EDNS0) != 0U) {
                   1006:                /*
                   1007:                 * Do not retry if the server do not understand EDNS0.
                   1008:                 * The case has to be captured here, as FORMERR packet do not
                   1009:                 * carry query section, hence res_queriesmatch() returns 0.
                   1010:                 */
                   1011:                DprintQ(statp->options & RES_DEBUG,
                   1012:                        (stdout, "server rejected query with EDNS0:\n"),
                   1013:                        ans, (resplen > anssiz) ? anssiz : resplen);
                   1014:                /* record the error */
                   1015:                statp->_flags |= RES_F_EDNS0ERR;
                   1016:                res_nclose(statp);
                   1017:                return (0);
                   1018:        }
                   1019: #endif
                   1020:        if (!(statp->options & RES_INSECURE2) &&
                   1021:            !res_queriesmatch(buf, buf + buflen,
                   1022:                              ans, ans + anssiz)) {
                   1023:                /*
                   1024:                 * response contains wrong query? ignore it.
                   1025:                 * XXX - potential security hazard could
                   1026:                 *       be detected here.
                   1027:                 */
                   1028:                DprintQ((statp->options & RES_DEBUG) ||
                   1029:                        (statp->pfcode & RES_PRF_REPLY),
                   1030:                        (stdout, ";; wrong query name:\n"),
                   1031:                        ans, (resplen > anssiz) ? anssiz : resplen);
                   1032:                goto wait;
                   1033:        }
                   1034:        if (anhp->rcode == SERVFAIL ||
                   1035:            anhp->rcode == NOTIMP ||
                   1036:            anhp->rcode == REFUSED) {
                   1037:                DprintQ(statp->options & RES_DEBUG,
                   1038:                        (stdout, "server rejected query:\n"),
                   1039:                        ans, (resplen > anssiz) ? anssiz : resplen);
                   1040:                res_nclose(statp);
                   1041:                /* don't retry if called from dig */
                   1042:                if (!statp->pfcode)
                   1043:                        return (0);
                   1044:        }
                   1045:        if (!(statp->options & RES_IGNTC) && anhp->tc) {
                   1046:                /*
                   1047:                 * To get the rest of answer,
                   1048:                 * use TCP with same server.
                   1049:                 */
                   1050:                Dprint(statp->options & RES_DEBUG,
                   1051:                       (stdout, ";; truncated answer\n"));
                   1052:                *v_circuit = 1;
                   1053:                res_nclose(statp);
                   1054:                return (1);
                   1055:        }
                   1056:        /*
                   1057:         * All is well, or the error is fatal.  Signal that the
                   1058:         * next nameserver ought not be tried.
                   1059:         */
                   1060:        return (resplen);
                   1061: }
                   1062:
                   1063: static void
                   1064: Aerror(const res_state statp, FILE *file, const char *string, int error,
                   1065:        const struct sockaddr *address, int alen)
                   1066: {
                   1067:        int save = errno;
                   1068:        char hbuf[NI_MAXHOST];
                   1069:        char sbuf[NI_MAXSERV];
                   1070:
                   1071:        alen = alen;
                   1072:
                   1073:        if ((statp->options & RES_DEBUG) != 0U) {
1.2       christos 1074:                if (getnameinfo(address, (socklen_t)alen, hbuf, sizeof(hbuf),
1.1       christos 1075:                    sbuf, sizeof(sbuf), niflags)) {
                   1076:                        strncpy(hbuf, "?", sizeof(hbuf) - 1);
                   1077:                        hbuf[sizeof(hbuf) - 1] = '\0';
                   1078:                        strncpy(sbuf, "?", sizeof(sbuf) - 1);
                   1079:                        sbuf[sizeof(sbuf) - 1] = '\0';
                   1080:                }
                   1081:                fprintf(file, "res_send: %s ([%s].%s): %s\n",
                   1082:                        string, hbuf, sbuf, strerror(error));
                   1083:        }
                   1084:        errno = save;
                   1085: }
                   1086:
                   1087: static void
                   1088: Perror(const res_state statp, FILE *file, const char *string, int error) {
                   1089:        int save = errno;
                   1090:
                   1091:        if ((statp->options & RES_DEBUG) != 0U)
                   1092:                fprintf(file, "res_send: %s: %s\n",
                   1093:                        string, strerror(error));
                   1094:        errno = save;
                   1095: }
                   1096:
                   1097: static int
                   1098: sock_eq(struct sockaddr *a, struct sockaddr *b) {
                   1099:        struct sockaddr_in *a4, *b4;
                   1100:        struct sockaddr_in6 *a6, *b6;
                   1101:
                   1102:        if (a->sa_family != b->sa_family)
                   1103:                return 0;
                   1104:        switch (a->sa_family) {
                   1105:        case AF_INET:
1.2       christos 1106:                a4 = (struct sockaddr_in *)(void *)a;
                   1107:                b4 = (struct sockaddr_in *)(void *)b;
1.1       christos 1108:                return a4->sin_port == b4->sin_port &&
                   1109:                    a4->sin_addr.s_addr == b4->sin_addr.s_addr;
                   1110:        case AF_INET6:
1.2       christos 1111:                a6 = (struct sockaddr_in6 *)(void *)a;
                   1112:                b6 = (struct sockaddr_in6 *)(void *)b;
1.1       christos 1113:                return a6->sin6_port == b6->sin6_port &&
                   1114: #ifdef HAVE_SIN6_SCOPE_ID
                   1115:                    a6->sin6_scope_id == b6->sin6_scope_id &&
                   1116: #endif
                   1117:                    IN6_ARE_ADDR_EQUAL(&a6->sin6_addr, &b6->sin6_addr);
                   1118:        default:
                   1119:                return 0;
                   1120:        }
                   1121: }
                   1122:
1.10      christos 1123: #if defined(NEED_PSELECT) && !defined(USE_POLL)
1.1       christos 1124: /* XXX needs to move to the porting library. */
                   1125: static int
                   1126: pselect(int nfds, void *rfds, void *wfds, void *efds,
                   1127:        struct timespec *tsp, const sigset_t *sigmask)
                   1128: {
                   1129:        struct timeval tv, *tvp;
                   1130:        sigset_t sigs;
                   1131:        int n;
                   1132:
                   1133:        if (tsp) {
                   1134:                tvp = &tv;
                   1135:                tv = evTimeVal(*tsp);
                   1136:        } else
                   1137:                tvp = NULL;
                   1138:        if (sigmask)
                   1139:                sigprocmask(SIG_SETMASK, sigmask, &sigs);
                   1140:        n = select(nfds, rfds, wfds, efds, tvp);
                   1141:        if (sigmask)
                   1142:                sigprocmask(SIG_SETMASK, &sigs, NULL);
                   1143:        if (tsp)
                   1144:                *tsp = evTimeSpec(tv);
                   1145:        return (n);
                   1146: }
                   1147: #endif

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