diff options
Diffstat (limited to 'contrib/bind/bin/named/ns_req.c')
| -rw-r--r-- | contrib/bind/bin/named/ns_req.c | 2560 |
1 files changed, 0 insertions, 2560 deletions
diff --git a/contrib/bind/bin/named/ns_req.c b/contrib/bind/bin/named/ns_req.c deleted file mode 100644 index 1272f04..0000000 --- a/contrib/bind/bin/named/ns_req.c +++ /dev/null @@ -1,2560 +0,0 @@ -#if !defined(lint) && !defined(SABER) -static const char sccsid[] = "@(#)ns_req.c 4.47 (Berkeley) 7/1/91"; -static const char rcsid[] = "$Id: ns_req.c,v 8.175.6.2 2003/06/02 09:56:35 marka Exp $"; -#endif /* not lint */ - -/* - * Copyright (c) 1986, 1988, 1990 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -/* - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies, and that - * the name of Digital Equipment Corporation not be used in advertising or - * publicity pertaining to distribution of the document or software without - * specific, written prior permission. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL - * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT - * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL - * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR - * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS - * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS - * SOFTWARE. - */ - -/* - * Portions Copyright (c) 1995 by International Business Machines, Inc. - * - * International Business Machines, Inc. (hereinafter called IBM) grants - * permission under its copyrights to use, copy, modify, and distribute this - * Software with or without fee, provided that the above copyright notice and - * all paragraphs of this notice appear in all copies, and that the name of IBM - * not be used in connection with the marketing of any product incorporating - * the Software or modifications thereof, without specific, written prior - * permission. - * - * To the extent it has a right to do so, IBM grants an immunity from suit - * under its patents, if any, for the use, sale or manufacture of products to - * the extent that such products are used for performing Domain Name System - * dynamic updates in TCP/IP networks by means of the Software. No immunity is - * granted for any product per se or for any other function of any product. - * - * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES, - * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A - * PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL, - * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING - * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN - * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES. - */ - -/* - * Portions Copyright (c) 1996-2000 by Internet Software Consortium. - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS - * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE - * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL - * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR - * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS - * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS - * SOFTWARE. - */ - -#include "port_before.h" - -#include <sys/types.h> -#include <sys/param.h> -#include <sys/uio.h> -#include <sys/file.h> -#include <sys/socket.h> -#include <sys/un.h> - -#include <netinet/in.h> -#include <arpa/nameser.h> -#include <arpa/inet.h> - -#include <errno.h> -#include <fcntl.h> -#include <resolv.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <syslog.h> -#include <time.h> - -#include <isc/eventlib.h> -#include <isc/logging.h> -#include <isc/memcluster.h> - -#include <isc/dst.h> - -#include "port_after.h" - -#include "named.h" - -struct addinfo { - char *a_dname; /* domain name */ - char *a_rname; /* referred by */ - u_int16_t a_rtype; /* referred by */ - u_int16_t a_type; /* type for data */ - u_int16_t a_class; /* class for data */ -}; - - -#ifndef BIND_UPDATE -enum req_action { Finish, Refuse, Return }; -#endif - -static struct addinfo addinfo[NADDRECS]; -static void addname(const char *, const char *, - u_int16_t, u_int16_t, u_int16_t); -static void copyCharString(u_char **, const char *); - -static enum req_action req_query(HEADER *hp, u_char **cpp, u_char *eom, - struct qstream *qsp, - int *buflenp, int *msglenp, - u_char *msg, int dfd, int *ra, - struct sockaddr_in from, - struct tsig_record *in_tsig, - u_int16_t udpsize); - -static enum req_action req_iquery(HEADER *hp, u_char **cpp, u_char *eom, - int *buflenp, struct sockaddr_in from); - -#ifdef BIND_NOTIFY -static enum req_action req_notify(HEADER *hp, u_char **cpp, u_char *eom, - u_char *msg,struct sockaddr_in from); -#endif - -/* - * See if there is a OPT record at the end of the message. - * - * Results: - * -1 FORMERR - * 0 last RR is not a OPT record - * n>0 lenght of OPT record - */ -int -ns_get_opt(u_char *msg, u_char *eom, - u_int8_t *versionp, u_int16_t *rcodep, u_int16_t *flagp, - u_int16_t *bufsizep, u_char **optionsp, size_t *optsizep) -{ - HEADER *hp = (HEADER *) msg; - u_char *start, *options, *cp; - u_int8_t version; - u_int16_t rdlen, type, bufsize, flags, optsize, rcode; - int i, n, root; - - if (msg == NULL || eom == NULL || (msg + HFIXEDSZ) > eom) - return (-1); - - if (ntohs(hp->arcount) == 0) - return (0); - - cp = msg + HFIXEDSZ; - n = ns_skiprr(cp, eom, ns_s_qd, ntohs(hp->qdcount)); - if (n < 0) - return (-1); - cp += n; - n = ns_skiprr(cp, eom, ns_s_an, ntohs(hp->ancount)); - if (n < 0) - return (-1); - cp += n; - n = ns_skiprr(cp, eom, ns_s_ns, ntohs(hp->nscount)); - if (n < 0) - return (-1); - cp += n; - i = ntohs(hp->arcount); - while (i-- > 0) { - start = cp; - if (cp >= eom) - return (-1); - root = (*cp == 0); - n = dn_skipname(cp, eom); - if (n < 0) - return (-1); - cp += n; - if (cp + (2 + 2 + 4 + 2) > eom) - return (-1); - GETSHORT(type, cp); - if (type != ns_t_opt) { - cp += INT16SZ + INT32SZ; /* class, ttl */ - GETSHORT(rdlen, cp); - if (cp + rdlen > eom) - return (-1); - cp += rdlen; - continue; - } - /* We have the OPT record. Check it out in detail. */ - if (!root) - return (-1); - GETSHORT(bufsize, cp); - rcode = (*cp++ <<4) + hp->rcode ; - version = *cp++; - GETSHORT(flags, cp); - GETSHORT(rdlen, cp); - if (cp + rdlen > eom) - return (-1); - options = cp; - optsize = rdlen; - if (versionp != NULL) - *versionp = version; - if (rcodep != NULL) - *rcodep = rcode; - if (flagp != NULL) - *flagp = flags; - if (bufsizep != NULL) - *bufsizep = bufsize; - if (optionsp != NULL) - *optionsp = options; - if (optsizep != NULL) - *optsizep = optsize; - return (cp - start); - } - /* OPT not found */ - return (0); -} - -int -ns_add_opt(u_char *msg, u_char *cp, size_t buflen, u_int8_t version, - u_int16_t rcode, u_int16_t size, u_int16_t flags, - u_char *options, size_t optlen) -{ - HEADER *hp = (HEADER *) msg; - - if ((cp + 1 + 2 + 2 + 4 + 2 + optlen) > (msg + buflen)) - return (-1); - - *cp++ = 0; /* "." */ - PUTSHORT(ns_t_opt, cp); /* type */ - PUTSHORT(size, cp); /* class (udp size) */ - *cp++ = (rcode >> 4) & 0xff; /* ttl (rcode + version + flags) */ - hp->rcode = rcode & 0xf; - *cp++ = version; - PUTSHORT(flags, cp); - PUTSHORT(optlen, cp); /* rdlen */ - memcpy(cp, options, optlen); /* options */ - hp->arcount = htons(ntohs(hp->arcount) + 1); - return (1 + 2 + 2 + 4 + 2 + optlen); -} - -/* - * Process request using database; assemble and send response. - */ -void -ns_req(u_char *msg, int msglen, int buflen, struct qstream *qsp, - struct sockaddr_in from, int dfd) -{ - HEADER *hp = (HEADER *) msg; - u_char *cp, *eom; - enum req_action action = Return; - int n, ra, has_tsig, tsig_size = 0, opt_size = 0, sig2len; - u_char *tsigstart; - u_char sig[TSIG_SIG_SIZE], sig2[TSIG_SIG_SIZE]; - struct tsig_record *in_tsig = NULL; - int error = NOERROR; - int msglen_orig = msglen; - int buflen_orig = buflen; - int siglen = sizeof sig; - DST_KEY *key = NULL; - time_t tsig_time; - int opt = 0; - u_int8_t version = 0; - u_int16_t rcode = ns_r_noerror; - u_int16_t udpsize = 0; - int drop; - int tsig_adjust = 0; - -#ifdef DEBUG - if (debug > 3) { - ns_debug(ns_log_packet, 3, "ns_req(from %s)", sin_ntoa(from)); - fp_nquery(msg, msglen, log_get_stream(packet_channel)); - } -#endif - - drop = drop_port(ntohs(from.sin_port)); - if (qsp == NULL && drop == 1) - return; - - tsigstart = ns_find_tsig(msg, msg + msglen); - if (tsigstart == NULL) - has_tsig = 0; - else { - char buf[MAXDNAME]; - u_char tmp[NS_MAXCDNAME]; - - has_tsig = 1; - n = ns_name_unpack(msg, msg + msglen, tsigstart, - tmp, sizeof tmp); - if (n > 0) { - tsig_adjust = dn_skipname(tmp, tmp + sizeof(tmp)) - n; - if (ns_name_ntop(tmp, buf, sizeof buf) == -1) - n = -1; - else if (buf[0] == '.') - buf[0] = '\0'; - } - if (n < 0) { - ns_debug(ns_log_default, 1, - "ns_req: bad TSIG key name"); - error = ns_r_formerr; - hp->rcode = ns_r_formerr; - key = NULL; - } else if ((key = find_key(buf, NULL)) == NULL) { - error = ns_r_badkey; - hp->rcode = ns_r_notauth; - ns_debug(ns_log_default, 1, - "ns_req: TSIG verify failed - unknown key %s", - buf); - } -#ifdef LOG_TSIG_BUG - if (n < 0 || key == NULL) - ns_error(ns_log_security, - "SECURITY: POSSIBLE ATTEMPT TO EXERCISE \"TSIG BUG\" FROM %s: %s%s%s", - sin_ntoa(from), - (n < 0) ? "bad key (formerr)" : - "unknown key (", - (n < 0) ? "" : (buf[0] != '\0' ? buf : "."), - (n < 0) ? "" : ")"); -#endif - } - if (has_tsig && key != NULL) { - n = ns_verify(msg, &msglen, key, NULL, 0, sig, &siglen, - &tsig_time, 0); - if (n != 0) { - hp->rcode = ns_r_notauth; - /* A query should never have an error code set */ - if (n == ns_r_badsig || n == ns_r_badkey || - n == ns_r_badtime) { - ns_debug(ns_log_default, 1, - "ns_req: TSIG verify failed - query had error %s (%d) set", - p_rcode(n), n); - error = n; - action = Return; - } - /* If there's a processing error just respond */ - else if (n == -ns_r_badsig || n == -ns_r_badkey || - n == -ns_r_badtime) { - n = -n; - ns_debug(ns_log_default, 1, - "ns_req: TSIG verify failed - %s (%d)", - p_rcode(n), n); - error = n; - } else { - ns_debug(ns_log_default, 1, - "ns_req: TSIG verify failed - FORMERR"); - error = ns_r_formerr; - } - action = Finish; - } - in_tsig = memget(sizeof(struct tsig_record)); - if (in_tsig == NULL) - ns_panic(ns_log_default, 1, "memget failed"); - in_tsig->key = key; - in_tsig->siglen = siglen; - memcpy(in_tsig->sig, sig, siglen); - tsig_size = msglen_orig - msglen; - /* AXFR/IXFR need the uncompressed tsig size. */ - in_tsig->tsig_size = tsig_size + tsig_adjust; - } else if (has_tsig) { - action = Finish; - in_tsig = memget(sizeof(struct tsig_record)); - if (in_tsig == NULL) - ns_panic(ns_log_default, 1, "memget failed"); - in_tsig->key = NULL; - in_tsig->siglen = 0; - tsig_size = msg + msglen - tsigstart; - in_tsig->tsig_size = tsig_size; - msglen = tsigstart - msg; - } - - /* Hash some stuff so it's nice and random */ - nsid_hash((u_char *)&tt, sizeof(tt)); - nsid_hash(msg, (msglen > 512) ? 512 : msglen); - - if (error == NOERROR) { - - opt = ns_get_opt(msg, msg + msglen, &version, - NULL, NULL, &udpsize, NULL, NULL); - if (opt < 0) { - rcode = ns_r_formerr; - action = Finish; - } else if (opt == 0) { - if (qsp == NULL && buflen > PACKETSZ) - buflen_orig = buflen = PACKETSZ; - } else if (opt > 0) { - if (version != 0) { - rcode = ns_r_badvers; - action = Finish; - } - opt_size = 11; - if (udpsize < 512) - udpsize = 512; - if (qsp == NULL && buflen > udpsize) - buflen_orig = buflen = udpsize; - } - } else if (qsp == NULL && buflen > PACKETSZ) - buflen_orig = buflen = PACKETSZ; - - /* - * It's not a response so these bits have no business - * being set. will later simplify work if we can - * safely assume these are always 0 when a query - * comes in. - */ -#ifdef BIND_NOTIFY - if (hp->opcode != ns_o_notify) -#endif - hp->aa = 0; - hp->ra = 0; - ra = (NS_OPTION_P(OPTION_NORECURSE) == 0); - - if (error == NOERROR) - hp->rcode = ns_r_noerror; - if (rcode == ns_r_noerror) - rcode = hp->rcode; - cp = msg + HFIXEDSZ; - eom = msg + msglen; - buflen -= HFIXEDSZ; - - free_addinfo(); /* sets addcount to zero */ - dnptrs[0] = NULL; - - if (error == NOERROR && rcode == ns_r_noerror) { - switch (hp->opcode) { - case ns_o_query: - action = req_query(hp, &cp, eom, qsp, - &buflen, &msglen, - msg, dfd, &ra, from, - in_tsig, udpsize); - break; - - case ns_o_iquery: - action = req_iquery(hp, &cp, eom, &buflen, from); - break; - -#ifdef BIND_NOTIFY - case ns_o_notify: - action = req_notify(hp, &cp, eom, msg, from); - break; -#endif - -#ifdef BIND_UPDATE - case ns_o_update: - action = req_update(hp, cp, eom, msg, from, in_tsig); - break; -#endif /* BIND_UPDATE */ - - default: - ns_debug(ns_log_default, 1, - "ns_req: Opcode %d not implemented", - hp->opcode); - /* XXX - should syslog, limited by haveComplained */ - hp->qdcount = htons(0); - hp->ancount = htons(0); - hp->nscount = htons(0); - hp->arcount = htons(0); - hp->rcode = ns_r_notimpl; - action = Finish; - } - rcode = hp->rcode; - } - - if (in_tsig != NULL) { - memput(in_tsig, sizeof(struct tsig_record)); - in_tsig = NULL; - } - - /* - * Loop advoidance. - */ - if (qsp == NULL && drop == 2 && - (hp->rcode == FORMERR || hp->rcode == NOTIMP)) - action = Return; - - /* - * Vector via internal opcode. - */ - switch (action) { - case Return: - return; - case Refuse: - rcode = hp->rcode = ns_r_refused; - cp = eom; - /*FALLTHROUGH*/ - case Finish: - /* rest of the function handles this case */ - break; - default: - panic("ns_req: bad action variable", NULL); - /*NOTREACHED*/ - } - - /* - * Apply final polish. - */ - hp->qr = 1; /* set Response flag */ - hp->ra = ra; /* init above, may be modified by req_query */ - - if (!hp->tc && (has_tsig > 0 || opt > 0) && - buflen < (tsig_size + opt_size)) - hp->tc = 1; - - /* - * If there was a format error, then we don't know what the msg has. - */ - if (hp->rcode == ns_r_formerr || rcode == ns_r_badvers) { - hp->qdcount = htons(0); - hp->ancount = htons(0); - hp->nscount = htons(0); - hp->arcount = htons(0); - cp = msg + HFIXEDSZ; - } - - /* - * If the query had a TSIG / OPT and the message is truncated or - * there was a TSIG error, build a new message with no data and a - * TSIG / OPT. - */ - if ((hp->tc || error != NOERROR) && (has_tsig > 0 || opt > 0)) { - sign_again: - hp->ancount = htons(0); - hp->nscount = htons(0); - hp->arcount = htons(0); - cp = msg + HFIXEDSZ; - cp += ns_skiprr(cp, msg + msglen, ns_s_qd, ntohs(hp->qdcount)); - ns_name_rollback(cp, (const u_char **)dnptrs, - (const u_char **)dnptrs_end); - if (opt > 0) { - n = ns_add_opt(msg, cp, buflen_orig, 0, rcode, - server_options->edns_udp_size, - 0, NULL, 0); - if (n < 0) { - hp->qdcount = htons(0); - goto sign_again; - } - cp += n; - } - if (has_tsig > 0) { - sig2len = sizeof sig2; - msglen = cp - msg; - buflen = buflen_orig - msglen; - n = ns_sign2(msg, &msglen, msglen + buflen, error, key, - sig, siglen, sig2, &sig2len, tsig_time, - dnptrs, dnptrs_end); - if (n == NS_TSIG_ERROR_NO_SPACE && - ntohs(hp->qdcount) != 0) { - hp->qdcount = htons(0); - goto sign_again; - } - if (n != 0) - ns_info(ns_log_default, - "ns_req: unable to sign response"); - cp = msg + msglen; - } - } - /* Either the message is not truncated or there was no TSIG & OPT */ - else { - /* - * Reserve space for tsig if required. - */ - if (has_tsig > 0 || opt_size != 0) - buflen -= tsig_size + opt_size; - INSIST(buflen >= 0); - msglen = cp - msg; - n = doaddinfo(hp, cp, buflen); - cp += n; - buflen -= n; - msglen += n; - if (opt > 0) { - buflen += opt_size; - n = ns_add_opt(msg, cp, msglen + buflen, 0, rcode, - server_options->edns_udp_size, - 0, NULL, 0); - INSIST(n > 0); - cp += n; - buflen -= n; - msglen += n; - } - if (has_tsig > 0) { - buflen += tsig_size; - sig2len = sizeof sig2; - n = ns_sign2(msg, &msglen, msglen + buflen, error, key, - sig, siglen, sig2, &sig2len, tsig_time, - dnptrs, dnptrs_end); - if (n != 0) { - INSIST(0); - } - cp = msg + msglen; - } - } - -#ifdef DEBUG - if (ns_wouldlog(ns_log_default, 1)) { - ns_debug(ns_log_default, 1, - "ns_req: answer -> %s fd=%d id=%d size=%d rc=%d", - sin_ntoa(from), (qsp == NULL) ? dfd : qsp->s_rfd, - ntohs(hp->id), cp - msg, hp->rcode); - } - if (debug >= 10) - res_pquery(&res, msg, cp - msg, - log_get_stream(packet_channel)); -#endif /*DEBUG*/ - if (qsp == NULL) { - if (sendto(dfd, (char*)msg, cp - msg, 0, - (struct sockaddr *)&from, - sizeof from) < 0) { - if (!haveComplained(ina_ulong(from.sin_addr), - (u_long)sendtoStr)) - ns_info(ns_log_default, - "ns_req: sendto(%s): %s", - sin_ntoa(from), strerror(errno)); - nameserIncr(from.sin_addr, nssSendtoErr); - } - nameserIncr(from.sin_addr, nssSentAns); - if (hp->rcode == ns_r_nxdomain) - nameserIncr(from.sin_addr, nssSentNXD); - if (!hp->aa) - nameserIncr(from.sin_addr, nssSentNaAns); - } else - writestream(qsp, msg, cp - msg); - - /* Is now a safe time? */ - if (needs_prime_cache) - prime_cache(); -} - -#ifdef BIND_NOTIFY -int -findZonePri(const struct zoneinfo *zp, const struct sockaddr_in from) { - struct in_addr ina; - int i; - - ina = from.sin_addr; - for (i = 0; (u_int)i < zp->z_addrcnt; i++) - if (ina_equal(zp->z_addr[i], ina)) - return (i); - return (-1); -} - -static enum req_action -req_notify(HEADER *hp, u_char **cpp, u_char *eom, u_char *msg, - struct sockaddr_in from) -{ - int n, type, class; - char dnbuf[MAXDNAME]; - struct zoneinfo *zp; - - /* valid notify's are authoritative */ - if (!hp->aa) { - ns_debug(ns_log_notify, 1, - "FORMERR Notify request without AA"); -#ifdef not_yet - hp->rcode = ns_r_formerr; - return (Finish); -#endif - } - hp->aa = 0; - - /* valid notify's have one question */ - if (ntohs(hp->qdcount) != 1) { - ns_debug(ns_log_notify, 1, - "FORMERR Notify header counts wrong"); - hp->rcode = ns_r_formerr; - return (Finish); - } - - n = dn_expand(msg, eom, *cpp, dnbuf, sizeof dnbuf); - if (n < 0) { - ns_debug(ns_log_notify, 1, - "FORMERR Query expand name failed"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += n; - if (*cpp + 2 * INT16SZ > eom) { - ns_debug(ns_log_notify, 1, - "FORMERR notify too short"); - hp->rcode = ns_r_formerr; - return (Finish); - } - GETSHORT(type, *cpp); - GETSHORT(class, *cpp); - ns_info(ns_log_notify, "rcvd NOTIFY(%s, %s, %s) from %s", - dnbuf, p_class(class), p_type(type), sin_ntoa(from)); - /* XXX - when answers are allowed, we'll need to do compression - * correctly here, and we will need to check for packet underflow. - */ - /* - * We are ignoring the other field, make sure the header reflects - * *cpp. - */ - hp->ancount = htons(0); - hp->nscount = htons(0); - hp->arcount = htons(0); - /* Find the zone this NOTIFY refers to. */ - zp = find_auth_zone(dnbuf, class); - if (zp == NULL) { - ns_info(ns_log_notify, - "rcvd NOTIFY for \"%s\", name not one of our zones", - dnbuf); - hp->rcode = ns_r_servfail; - return (Finish); - } - /* Access control. */ - switch (type) { - case T_SOA: - if (zp->z_type != z_slave) { - /* - * This can come if a user did an AXFR of some zone - * somewhere and that zone's server now wants to - * tell us that the SOA has changed. AXFR's always - * come from nonpriv ports so it isn't possible to - * know whether it was the server or just "dig". - * This condition can be avoided by using secure - * zones since that way only real secondaries can - * AXFR from you. - */ - ns_info(ns_log_notify, - "NOTIFY(SOA) for non-slave zone (%s), from %s", - dnbuf, sin_ntoa(from)); - goto refuse; - } - if (ns_samename(dnbuf, zp->z_origin) != 1) { - ns_info(ns_log_notify, - "NOTIFY(SOA) for non-origin (%s), from %s", - dnbuf, sin_ntoa(from)); - goto refuse; - } - if (findZonePri(zp, from) == -1) { - ns_debug(ns_log_notify, 1, - "NOTIFY(SOA) from non-master server (zone %s), from %s", - zp->z_origin, sin_ntoa(from)); - goto refuse; - } - break; - default: - /* No access requirements defined for other types. */ - break; - } - /* The work occurs here. */ - switch (type) { - case T_SOA: - if (zp->z_flags & - (Z_NEED_RELOAD|Z_NEED_XFER|Z_QSERIAL|Z_XFER_RUNNING)) { - ns_info(ns_log_notify, - "NOTIFY(SOA) for zone already xferring (%s)", - dnbuf); - zp->z_flags |= Z_NEEDREFRESH; - goto noerror; - } - zp->z_time = tt.tv_sec; - qserial_query(zp); - sched_zone_maint(zp); - break; - default: - /* - * Unimplemented, but it's not a protocol error, just - * something to be ignored. - */ - hp->rcode = ns_r_notimpl; - return (Finish); - } - noerror: - hp->rcode = ns_r_noerror; - hp->aa = 1; - return (Finish); - refuse: - hp->rcode = ns_r_refused; - return (Finish); -} -#endif /*BIND_NOTIFY*/ - -static int -add_bind(HEADER *hp, u_char **cpp, u_char *msg, int *msglenp, - const char *label, const char *data) -{ - u_char *tp; - - hp->ancount = htons(1); - hp->nscount = htons(0); - hp->arcount = htons(0); - hp->rcode = ns_r_noerror; - hp->aa = 1; - hp->ra = 0; - copyCharString(cpp, label); /* Name */ - copyCharString(cpp, "BIND"); - *(*cpp)++ = 0x00; - PUTSHORT(T_TXT, *cpp); /* Type */ - PUTSHORT(C_CHAOS, *cpp); /* Class */ - PUTLONG(0, *cpp); /* TTL */ - tp = *cpp; /* Temp RdLength */ - PUTSHORT(0, *cpp); - copyCharString(cpp, data); - PUTSHORT((*cpp) - (tp + INT16SZ), tp); /* Real RdLength */ - *msglenp = *cpp - msg; /* Total message length */ - return (Finish); -} - -static enum req_action -req_query(HEADER *hp, u_char **cpp, u_char *eom, struct qstream *qsp, - int *buflenp, int *msglenp, u_char *msg, int dfd, int *ra, - struct sockaddr_in from, struct tsig_record *in_tsig, - u_int16_t udpsize) -{ - int n, class, type, count, zone, foundname, founddata, omsglen, cname; - int recursion_blocked_by_acl; - u_int16_t id; - u_int32_t serial_ixfr = 0; - int ixfr_found; - int ixfr_error = 0; - char dnbuf2[MAXDNAME]; - u_char **dpp, *omsg, *answers, *afterq; - char dnbuf[MAXDNAME], *dname; - const char *fname; - struct hashbuf *htp; - struct databuf *nsp[NSMAX]; - struct namebuf *np, *anp; - struct qinfo *qp; - struct zoneinfo *zp; - struct databuf *dp; - DST_KEY *in_key = (in_tsig != NULL) ? in_tsig->key : NULL; - int access_class; - int adjustlen = 0; - int pass = 0; - char tsig_keyname_mesg[15+MAXDNAME] = ""; - int glueok; - - nameserIncr(from.sin_addr, nssRcvdQ); - - nsp[0] = NULL; - dpp = dnptrs; - *dpp++ = msg; - *dpp = NULL; - /* - * Make gcc happy. - */ - omsglen = 0; - omsg = NULL; - id = 0; - recursion_blocked_by_acl = 0; - - /* valid queries have one question and zero answers */ - if ((ntohs(hp->qdcount) != 1) - || ntohs(hp->ancount) != 0) { - ns_debug(ns_log_default, 1, - "FORMERR Query header counts wrong"); - hp->rcode = ns_r_formerr; - return (Finish); - } - - if (ntohs(hp->arcount) != 0) { - ns_debug(ns_log_default, 1, "Ignoring addition section"); - hp->arcount = htons(0); - adjustlen = 1; - } - - /* - * Get domain name, class, and type. - */ - if ((**cpp & INDIR_MASK) == 0) - *dpp++ = *cpp; /* remember name for compression */ - *dpp = NULL; - n = dn_expand(msg, eom, *cpp, dnbuf, sizeof dnbuf); - if (n < 0) { - ns_debug(ns_log_default, 1, - "FORMERR Query expand name failed"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += n; - if (*cpp + 2 * INT16SZ > eom) { - ns_debug(ns_log_default, 1, - "FORMERR Query message length short"); - hp->rcode = ns_r_formerr; - return (Finish); - } - GETSHORT(type, *cpp); - GETSHORT(class, *cpp); - if (*cpp < eom && type != ns_t_ixfr) { - if (!adjustlen) - ns_debug(ns_log_default, 6, - "message length > received message"); - *msglenp = *cpp - msg; - } - - if (((ntohs(hp->nscount) != 0) && (type != ns_t_ixfr)) || - ((ntohs(hp->nscount) != 1) && (type == ns_t_ixfr))) - { - ns_debug(ns_log_default, 1, "FORMERR Query nscount wrong"); - hp->rcode = ns_r_formerr; - return (Finish); - } - - afterq = *cpp; - qtypeIncr(type); - - /* - * Process query. - */ - if (type == ns_t_ixfr) { - ns_info(ns_log_security, "Request %s from %s", - p_type(type), sin_ntoa(from)); - hp->nscount = htons(0); - hp->rd = 0; /* Force IXFR queries to be non recursive. */ - n = dn_expand(msg, eom, *cpp, dnbuf2, sizeof dnbuf2); - if (n < 0) { - ns_debug(ns_log_default, 1, - "FORMERR Query expand name failed"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += n; - if (*cpp + 3 * INT16SZ + INT32SZ > eom) { - ns_debug(ns_log_default, 1, - "ran out of data in IXFR query"); - hp->rcode = ns_r_formerr; - return (Finish); - } - GETSHORT(n, *cpp); - if (n != ns_t_soa || ns_samename(dnbuf, dnbuf2) != 1) { - ns_debug(ns_log_default, 1, - "FORMERR SOA record expected"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += INT32SZ + INT16SZ * 2; /* skip class, ttl, dlen */ - if (0 >= (n = dn_skipname(*cpp, eom))) { - ns_debug(ns_log_default, 1, - "FORMERR Query expand name failed"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += n; /* mname */ - if (0 >= (n = dn_skipname(*cpp, eom))) { - ns_debug(ns_log_default, 1, - "FORMERR Query expand name failed"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += n; /* rname */ - if (*cpp + 5 * INT32SZ > eom) { - ns_debug(ns_log_default, 1, - "ran out of data in IXFR query"); - hp->rcode = ns_r_formerr; - return (Finish); - } - GETLONG(serial_ixfr, *cpp); - /* ignore other soa counters */ - if ((*cpp + (4 * INT32SZ)) < eom && !adjustlen) - ns_debug(ns_log_default, 6, - "ixfr: message length > received message"); - /* Reset msglenp to cover just the question. */ - *msglenp = afterq - msg; - } - *cpp = afterq; - - if (!ns_t_udp_p(type)) { - /* Refuse request if not a TCP connection. */ - if (qsp == NULL) { - ns_info(ns_log_default, - "rejected UDP %s from %s for \"%s\"", - p_type(type), sin_ntoa(from), - *dnbuf ? dnbuf : "."); - return (Refuse); - } - /* The position of this is subtle. */ - nameserIncr(from.sin_addr, nssRcvdAXFR); - hp->rd = 0; /* Recursion not possible. */ - } - *buflenp -= (*msglenp - HFIXEDSZ); - count = 0; - founddata = 0; - dname = dnbuf; - cname = 0; - -#ifdef QRYLOG - if (qrylog) { - ns_info(ns_log_queries, "%s/%s/%s/%s/%s", - (hp->rd) ? "XX+" : "XX ", - inet_ntoa(from.sin_addr), - (dname[0] == '\0') ? "." : dname, - p_type(type), p_class(class)); - } -#endif /*QRYLOG*/ - - try_again: - pass++; - foundname = 0; - ns_debug(ns_log_default, 1, "req: nlookup(%s) id %d type=%d class=%d", - dname, ntohs(hp->id), type, class); - htp = hashtab; /* lookup relative to root */ - if ((anp = np = nlookup(dname, &htp, &fname, 0)) == NULL) - fname = ""; - ns_debug(ns_log_default, 1, "req: %s '%s' as '%s' (cname=%d)", - np == NULL ? "missed" : "found", - dname, fname, cname); - -#ifdef YPKLUDGE - /* Some braindamaged resolver software will not - recognize internet addresses in dot notation and - send out address queries for "names" such as - 128.93.8.1. This kludge will prevent those - from flooding higher level servers. - We simply claim to be authoritative and that - the domain doesn't exist. - Note that we could return the address but we - don't do that in order to encourage that broken - software is fixed. - */ - - if (!np && type == T_A && class == C_IN && dname) { - struct in_addr ina; - - if (inet_aton(dname, &ina)) { - hp->rcode = ns_r_nxdomain; - hp->aa = 1; - ns_debug(ns_log_default, 3, - "ypkludge: hit as '%s'", dname); - return (Finish); - } - } -#endif /*YPKLUDGE*/ - - /* - * Don't accept in a query names which would be rejected in responses. - * (This is primarily in case we have to forward it, but it's also a - * matter of architectural symmetry.) - */ - if (!ns_nameok(NULL, dname, class, NULL, response_trans, - ns_ownercontext(type, response_trans), - dname, from.sin_addr)) { - ns_debug(ns_log_default, 1, "bad name in query"); - hp->rcode = ns_r_formerr; - return (Refuse); - } - - /* - * Begin Access Control Point - */ - zone = DB_Z_CACHE; - - /* - * Map class ANY to to class IN for the purpose of access control. - */ - access_class = (class == C_ANY && !ns_t_xfr_p(type)) ? C_IN : class; - - if (np) { -#ifndef FORWARD_ALLOWS - struct namebuf *access_np; - - /* - * Find out which zone this will be answered from. Note - * that we look for a zone with the same class as ours. - * The np that we found in the database might not be the - * one we asked for (i.e. dname might not equal fname). This - * is OK, since if a name doesn't exist, we need to go up - * the tree until we find the closest enclosing zone that - * is of the same class. - */ - for (access_np = np; access_np != NULL; - access_np = np_parent(access_np)) { - dp = access_np->n_data; - while (dp && dp->d_class != access_class) - dp = dp->d_next; - if (dp != NULL) { - zone = dp->d_zone; - break; - } - } -#else - /* - * Try looking for forward zone. It can be deeper than - * any entry in the cache. - */ - if (zone == DB_Z_CACHE) { - char *s = dname; - int escape = 0; - while ((zp = find_zone(s, access_class)) == NULL) { - if (*s == '\0') - break; - while (*s != '\0' && (escape || *s != '.')) { - escape = escape ? 0 : (*s == '\\'); - s++; - } - if (*s == '.') - s++; - } - if (zp != NULL) - zone = zp - zones; - } -#endif - } - - zp = &zones[zone]; - - ixfr_found = 0; - if (type == ns_t_ixfr && zone != DB_Z_CACHE) { - if (SEQ_GT(serial_ixfr, zp->z_serial)) - ixfr_found = 0; - else { - ixfr_error = ixfr_have_log(zp, serial_ixfr, - zp->z_serial); - if (ixfr_error < 0) { - ns_info(ns_log_security, "No %s log from %d for \"%s\"", - p_type(type), serial_ixfr, *dname ? dname : "."); - ns_debug(ns_log_default, - 1, "ixfr_have_log(%d %d) failed %d", - serial_ixfr, zp->z_serial, ixfr_error); - ixfr_found = 0; /* Refuse IXFR and send AXFR */ - } else if (ixfr_error == 1) { - ixfr_found = 1; - } - } - ns_debug(ns_log_default, 1, "IXFR log lowest serial: %d", - zp->z_serial_ixfr_start); - } - /* - * If recursion is turned on, we need to check recursion ACL - * if it exists - and return result to caller. - */ - { - ip_match_list recursion_acl; - - recursion_acl = server_options->recursion_acl; - if (!NS_OPTION_P(OPTION_NORECURSE) && recursion_acl != NULL - && !ip_address_allowed(recursion_acl, from.sin_addr)) { - recursion_blocked_by_acl = 1; - *ra = 0; - } - } - - /* - * Are queries allowed from this host? - */ - if (!ns_t_xfr_p(type)) { - ip_match_list query_acl; - - if (zp->z_query_acl != NULL) - query_acl = zp->z_query_acl; - else - query_acl = server_options->query_acl; - - if (query_acl != NULL - && !ip_addr_or_key_allowed(query_acl, from.sin_addr, - in_key)) - { - /* - * If this is *not* a zone acl and we would not - * have recursed and we have some answer return - * what we have with a referral. - */ - if ((zp->z_query_acl == NULL) && - (!hp->rd || NS_OPTION_P(OPTION_NORECURSE) || - recursion_blocked_by_acl) && - (ntohs(hp->ancount) != 0)) { - goto fetchns; - } - - /* - * See if we would have made a referral from - * an enclosing zone if we are actually in the - * cache. - */ - if (zp->z_type == z_cache && np != NULL) { - struct namebuf *access_np; - - zone = DB_Z_CACHE; - for (access_np = np; access_np != NULL; - access_np = np_parent(access_np)) { - dp = access_np->n_data; - while (dp && - (dp->d_class != access_class || - dp->d_zone == DB_Z_CACHE)) - dp = dp->d_next; - if (dp != NULL) { - zone = dp->d_zone; - np = access_np; - break; - } - } - zp = &zones[zone]; - if (zp->z_type != z_cache && - zp->z_query_acl != NULL && - ip_addr_or_key_allowed(zp->z_query_acl, - from.sin_addr, in_key) && - (!hp->rd || recursion_blocked_by_acl || - NS_OPTION_P(OPTION_NORECURSE))) { - goto fetchns; - } - } -#ifdef NXDOMAIN_ON_DENIAL - hp->rcode = ns_r_nxdomain; - return (Finish); -#else - ns_notice(ns_log_security, - "denied query from %s for \"%s\" %s/%s", - sin_ntoa(from), *dname ? dname : ".", - p_type(type), p_class(class)); - nameserIncr(from.sin_addr, nssRcvdUQ); - return (Refuse); -#endif - } - } else { - ip_match_list transfer_acl; - - /* Do they have permission to do a zone transfer? */ - - if (zp->z_transfer_acl != NULL) - transfer_acl = zp->z_transfer_acl; - else - transfer_acl = server_options->transfer_acl; - - if (transfer_acl != NULL - && !ip_addr_or_key_allowed(transfer_acl, from.sin_addr, - in_key)) - { - ns_notice(ns_log_security, - "denied %s from %s for \"%s\" %s (acl)", - p_type(type), sin_ntoa(from), - *dname ? dname : ".", p_class(class)); - nameserIncr(from.sin_addr, nssRcvdUXFR); - if (type == ns_t_ixfr) { - hp->rcode = ns_r_refused; - return (Finish); - } - return (Refuse); - } - - /* Are we master or slave? */ - - if (zp->z_type != z_master && zp->z_type != z_slave) { - ns_notice(ns_log_security, - "denied %s from %s for \"%s\" (not master/slave)", - p_type(type), sin_ntoa(from), - *dname ? dname : "."); - nameserIncr(from.sin_addr, nssRcvdUXFR); - if (type == ns_t_ixfr) { - hp->rcode = ns_r_refused; - return (Finish); - } - return (Refuse); - } - - /* Are we authoritative? */ - - if ((zp->z_flags & Z_AUTH) == 0) { - ns_notice(ns_log_security, - "denied %s from %s for \"%s\" %s (not authoritative)", - p_type(type), sin_ntoa(from), - *dname ? dname : ".", p_class(class)); - nameserIncr(from.sin_addr, nssRcvdUXFR); - if (type == ns_t_ixfr) { - hp->rcode = ns_r_refused; - return (Finish); - } - return (Refuse); - } - - /* Is the name at a zone cut? */ - - if (ns_samename(zp->z_origin, dname) != 1) { - ns_notice(ns_log_security, - "denied %s from %s for \"%s\" %s (not zone top)", - p_type(type), sin_ntoa(from), - *dname ? dname : ".", p_class(class)); - nameserIncr(from.sin_addr, nssRcvdUXFR); - if (type == ns_t_ixfr) { - hp->rcode = ns_r_refused; - return (Finish); - } - return (Refuse); - } - - if (in_key != NULL) - sprintf(tsig_keyname_mesg, " (TSIG key \"%s\")", - in_key->dk_key_name); - - if (type == ns_t_ixfr) - ns_info(ns_log_security, "approved %s from %s for \"%s\"%s", - (ixfr_found) ? p_type(type) : "IXFR/AXFR", - sin_ntoa(from), *dname ? dname : ".", - tsig_keyname_mesg); - else - ns_info(ns_log_security, "approved %s from %s for \"%s\"%s", - p_type(type), sin_ntoa(from), *dname ? dname : ".", - tsig_keyname_mesg); - } - - /* - * End Access Control Point - */ - /* - * Yow! - */ - if (class == ns_c_chaos && type == ns_t_txt && - ns_samename(dnbuf, "VERSION.BIND") == 1 && - server_options->version != NULL && - server_options->version[0] != '\0') - return (add_bind(hp, cpp, msg, msglenp, - "VERSION", server_options->version)); - - if (class == ns_c_chaos && type == ns_t_txt && - ns_samename(dnbuf, "HOSTNAME.BIND") == 1 && - server_options->hostname != NULL && - server_options->hostname[0] != '\0') - return (add_bind(hp, cpp, msg, msglenp, - "HOSTNAME", server_options->hostname)); - - /* - * If we don't know anything about the requested name, - * go look for nameservers. - */ - if (!np || fname != dname) - goto fetchns; - - foundname++; - answers = *cpp; - count = *cpp - msg; - - /* The response is authoritative until we add insecure data */ - hp->ad = 1; - - /* Look for NXDOMAIN record with appropriate class - * if found return immediately - */ - for (dp = np->n_data; dp; dp = dp->d_next) { - if (!stale(dp) && (dp->d_rcode == ns_r_nxdomain) && - (dp->d_class == class)) { -#ifdef RETURNSOA - n = finddata(np, class, T_SOA, hp, &dname, - buflenp, &count, pass, 1); - if (n != 0) { - if (count) { - *cpp += n; - *buflenp -= n; - *msglenp += n; - hp->nscount = htons((u_int16_t)count); - } - if (hp->rcode == NOERROR_NODATA) { - /* this should not occur */ - hp->rcode = ns_r_noerror; - return (Finish); - } - } -#else - count = 0; -#endif - hp->rcode = ns_r_nxdomain; - /* - * XXX forcing AA all the time isn't right, but - * we have to work that way by default - * for compatibility with older servers. - */ - if (!NS_OPTION_P(OPTION_NONAUTH_NXDOMAIN)) - hp->aa = 1; - ns_debug(ns_log_default, 3, "NXDOMAIN aa = %d", - hp->aa); - if ((count == 0) || NS_OPTION_P(OPTION_NORFC2308_TYPE1)) - return (Finish); - founddata = 1; - goto fetchns; - } - } - - /* - * If not NXDOMAIN, the NOERROR_NODATA record might be - * anywhere in the chain. Have to go through the grind. - */ - glueok = !NS_OPTION_P(OPTION_NORECURSE); - n = finddata(np, class, type, hp, &dname, buflenp, &count, pass, - glueok); - if (n == 0) { - /* - * NO data available. Refuse transfer requests, or - * look for better servers for other requests. - */ - if (ns_t_xfr_p(type)) { - ns_debug(ns_log_default, 1, - "transfer refused: no data"); - return (Refuse); - } - goto fetchns; - } - - if (hp->rcode == NOERROR_NODATA) { - hp->rcode = ns_r_noerror; -#ifdef RETURNSOA - if (count) { - *cpp += n; - *buflenp -= n; - *msglenp += n; - hp->nscount = htons(count); - } -#endif - founddata = 1; - ns_debug(ns_log_default, 1, "count = %d", count); - if ((count == 0) || NS_OPTION_P(OPTION_NORFC2308_TYPE1)) - return (Finish); - goto fetchns; - } - - *cpp += n; - *buflenp -= n; - *msglenp += n; - hp->ancount = htons(ntohs(hp->ancount) + (u_int16_t)count); - if (fname != dname && type != T_CNAME && type != T_ANY) { - if (cname++ >= MAXCNAMES) { - ns_debug(ns_log_default, 3, - "resp: leaving, MAXCNAMES exceeded"); - hp->rcode = ns_r_servfail; - return (Finish); - } - goto try_again; - } - founddata = 1; - ns_debug(ns_log_default, 3, - "req: foundname=%d, count=%d, founddata=%d, cname=%d", - foundname, count, founddata, cname); - - if (ns_t_xfr_p(type)) { -#ifdef BIND_UPDATE - if ((zp->z_flags & Z_NEED_SOAUPDATE) != 0) - if (incr_serial(zp) < 0) - ns_error(ns_log_default, - "error updating serial number for %s from %d", - zp->z_origin, zp->z_serial); -#endif - /* - * Just return SOA if "up to date". - */ - if (type == ns_t_ixfr) { - hp->aa = 1; - if ((SEQ_GT(serial_ixfr, zp->z_serial) || - serial_ixfr == zp->z_serial)) { - return (Finish); - } - } - - /* - * We don't handle UDP based IXFR queries (yet). - * Tell client to retry with TCP by returning SOA. - */ - if (qsp == NULL) - return (Finish); - else { - if (!ixfr_found && type == ns_t_ixfr) { - qsp->flags |= STREAM_AXFRIXFR; - hp->qdcount = htons(1); - } - ns_xfr(qsp, np, zone, class, type, - hp->opcode, ntohs(hp->id), - serial_ixfr, in_tsig); - } - return (Return); - } - - if (count > 1 && type == T_A && !NS_OPTION_P(OPTION_NORECURSE) && - hp->rd) - sort_response(answers, *cpp, count, &from); - - fetchns: - /* - * If we're already out of room in the response, we're done. - */ - if (hp->tc) - return (Finish); - - if (hp->ancount == 0) - hp->ad = 0; - - /* - * Look for name servers to refer to and fill in the authority - * section or record the address for forwarding the query - * (recursion desired). - */ - free_nsp(nsp); - nsp[0] = NULL; - count = 0; - switch (findns(&np, class, nsp, &count, 0)) { - case NXDOMAIN: - /* We are authoritative for this np. */ - if (!foundname) - hp->rcode = ns_r_nxdomain; - ns_debug(ns_log_default, 3, "req: leaving (%s, rcode %d)", - dname, hp->rcode); - if (class != C_ANY) { - if (!cname) - hp->aa = 1; - if (np && (!foundname || !founddata)) { - n = doaddauth(hp, *cpp, *buflenp, np, nsp[0]); - *cpp += n; - *buflenp -= n; -#ifdef ADDAUTH - } else if (ntohs(hp->ancount) != 0) { - /* don't add NS records for NOERROR NODATA - as some servers can get confused */ - free_nsp(nsp); - switch (findns(&np, class, nsp, &count, 1)) { - case NXDOMAIN: - case SERVFAIL: - break; - default: - if (np && - (type != T_NS || np != anp) - ) { - n = add_data(np, nsp, *cpp, - *buflenp, &count); - if (n < 0) { - hp->tc = 1; - n = (-n); - } - *cpp += n; - *buflenp -= n; - hp->nscount = - htons((u_int16_t) - count); - } - } -#endif /*ADDAUTH*/ - } - } - free_nsp(nsp); - return (Finish); - - case SERVFAIL: - /* We're authoritative but the zone isn't loaded. */ - if (!founddata && - !(NS_ZOPTION_P(zp, OPTION_FORWARD_ONLY) && - NS_ZFWDTAB(zp))) { - hp->rcode = ns_r_servfail; - free_nsp(nsp); - return (Finish); - } - } - - if (!founddata && hp->rd && recursion_blocked_by_acl) { - ns_notice(ns_log_security, - "denied recursion for query from %s for %s %s", - sin_ntoa(from), *dname ? dname : ".", p_class(class)); - nameserIncr(from.sin_addr, nssRcvdURQ); - } - - /* - * If we successfully found the answer in the cache, - * or this is not a recursive query, or we are purposely - * never recursing, or recursion is prohibited by ACL, then - * add the nameserver references("authority section") here - * and we're done. - */ - if (founddata || !hp->rd || NS_OPTION_P(OPTION_NORECURSE) - || recursion_blocked_by_acl) { - /* - * If the qtype was NS, and the np of the authority is - * the same as the np of the data, we don't need to add - * another copy of the answer here in the authority - * section. - */ - if (!founddata || type != T_NS || anp != np) { - n = add_data(np, nsp, *cpp, *buflenp, &count); - if (n < 0) { - hp->tc = 1; - n = (-n); - } - *cpp += n; - *buflenp -= n; - hp->nscount = htons(ntohs(hp->nscount) + - (u_int16_t)count); - } - free_nsp(nsp); - - /* Our caller will handle the Additional section. */ - return (Finish); - } - - /* - * At this point, we don't have the answer, but we do - * have some NS's to try. If the user would like us - * to recurse, create the initial query. If a cname - * is involved, we need to build a new query and save - * the old one in cmsg/cmsglen. - */ - if (cname) { - omsg = (u_char *)memget((unsigned) *msglenp); - if (omsg == NULL) { - ns_info(ns_log_default, "ns_req: Out Of Memory"); - hp->rcode = ns_r_servfail; - free_nsp(nsp); - return (Finish); - } - id = hp->id; - omsglen = *msglenp; - memcpy(omsg, msg, omsglen); - n = res_nmkquery(&res, QUERY, dname, class, type, - NULL, 0, NULL, msg, - *msglenp + *buflenp); - if (n < 0) { - ns_info(ns_log_default, "res_mkquery(%s) failed", - dname); - memcpy(msg, omsg, omsglen); - memput(omsg, omsglen); - hp->rcode = ns_r_servfail; - free_nsp(nsp); - return (Finish); - } - *msglenp = n; - } - n = ns_forw(nsp, msg, *msglenp, from, qsp, dfd, &qp, - dname, class, type, np, 0, in_tsig); - if (n != FW_OK && cname) { - memcpy(msg, omsg, omsglen); - memput(omsg, omsglen); - *msglenp = omsglen; - omsg = NULL; - } - switch (n) { - case FW_OK: - if (cname) { - qp->q_cname = cname; - qp->q_cmsg = omsg; - qp->q_cmsglen = omsglen; - qp->q_cmsgsize = omsglen; - qp->q_id = id; - } - if (udpsize != 0) { - qp->q_flags |= Q_EDNS; - qp->q_udpsize = udpsize; - } else - qp->q_udpsize = PACKETSZ; - break; - case FW_DUP: - break; /* Duplicate request dropped */ - case FW_NOSERVER: - /* - * Don't go into an infinite loop if - * the admin gave root NS records in the cache - * file without giving address records - * for the root servers. - */ - if (np) { - if (NAME(*np)[0] == '\0') { - ns_notice(ns_log_default, - "ns_req: no address for root server"); - hp->rcode = ns_r_servfail; - free_nsp(nsp); - return (Finish); - } - for (dp = np->n_data; dp ; dp = dp->d_next) - if (dp->d_zone && match(dp, class, T_NS)) - break; - if (dp) { - /* - * we know the child zone exists but are - * missing glue. - * - * nslookup has called sysquery() to get the - * missing glue. - * - * for UDP, drop the response and let the - * client retry. for TCP, we should probably - * (XXX) hold open the TCP connection for a - * while in case the sysquery() comes back - * soon. meanwhile we SERVFAIL. - */ - if (qsp) - goto do_servfail; - break; - } - np = np_parent(np); - } - goto fetchns; /* Try again. */ - case FW_SERVFAIL: - do_servfail: - hp->rcode = ns_r_servfail; - free_nsp(nsp); - return (Finish); - } - free_nsp(nsp); - return (Return); -} - -static enum req_action -req_iquery(HEADER *hp, u_char **cpp, u_char *eom, int *buflenp, - struct sockaddr_in from) -{ - u_int rdata_offset; - size_t alen; - int dlen, n; - ns_type type; - ns_class class; - u_char anbuf[PACKETSZ], *anptr; - char dnbuf[MAXDNAME]; - - nameserIncr(from.sin_addr, nssRcvdIQ); - - if (ntohs(hp->ancount) != 1 || - ntohs(hp->qdcount) != 0 || - ntohs(hp->nscount) != 0 || - ntohs(hp->arcount) != 0) { - ns_debug(ns_log_default, 1, - "FORMERR IQuery header counts wrong"); - hp->rcode = ns_r_formerr; - return (Finish); - } - - /* - * Skip domain name, get class, and type. - */ - anptr = *cpp; - n = dn_skipname(*cpp, eom); - if (n < 0) { - ns_debug(ns_log_default, 1, - "FORMERR IQuery packet name problem"); - hp->rcode = ns_r_formerr; - return (Finish); - } - *cpp += n; - if (*cpp + 3 * INT16SZ + INT32SZ > eom) { - ns_debug(ns_log_default, 1, - "FORMERR IQuery message too short"); - hp->rcode = ns_r_formerr; - return (Finish); - } - GETSHORT(type, *cpp); - GETSHORT(class, *cpp); - *cpp += INT32SZ; /* ttl */ - GETSHORT(dlen, *cpp); - if (*cpp + dlen != eom) { - ns_debug(ns_log_default, 1, - "FORMERR IQuery message length off"); - hp->rcode = ns_r_formerr; - return (Finish); - } - rdata_offset = *cpp - anptr; - *cpp += dlen; - INSIST(*cpp == eom); - - /* - * Not all inverse queries are handled. - */ - if (type != ns_t_a) { - ns_warning(ns_log_security, - "unsupported iquery type from %s", - inet_ntoa(from.sin_addr)); - return (Refuse); - } - if (dlen != INT32SZ) { - ns_warning(ns_log_security, - "bad iquery from %s", - inet_ntoa(from.sin_addr)); - return (Refuse); - } - if (!NS_OPTION_P(OPTION_FAKE_IQUERY)) - return (Refuse); - - ns_debug(ns_log_default, 1, - "req: IQuery class %d type %d", class, type); - - alen = eom - anptr; - if (alen > sizeof anbuf) { - ns_warning(ns_log_security, - "bad iquery from %s", - inet_ntoa(from.sin_addr)); - return (Refuse); - } - memcpy(anbuf, anptr, alen); - *cpp = anptr; - *buflenp -= HFIXEDSZ; - -#ifdef QRYLOG - if (qrylog) { - char tmp[sizeof "255.255.255.255"]; - - strcpy(tmp, inet_ntoa(from.sin_addr)); - ns_info(ns_log_queries, "XX /%s/%s/-%s", - tmp, inet_ntoa(ina_get(&anbuf[rdata_offset])), - p_type(type)); - } -#endif /*QRYLOG*/ - - /* - * We can only get here if the option "fake-iquery" is on in the boot - * file. - * - * What we do here is send back a bogus response of "[dottedquad]". - * A better strategy would be to turn this into a PTR query, but that - * would legitimize inverse queries in a way they do not deserve. - */ - sprintf(dnbuf, "[%s]", inet_ntoa(ina_get(&anbuf[rdata_offset]))); - *buflenp -= QFIXEDSZ; - n = dn_comp(dnbuf, *cpp, *buflenp, NULL, NULL); - if (n < 0) { - hp->tc = 1; - return (Finish); - } - *cpp += n; - *buflenp -= n; - PUTSHORT((u_int16_t)type, *cpp); - *buflenp -= INT16SZ; - PUTSHORT((u_int16_t)class, *cpp); - *buflenp -= INT16SZ; - - hp->qdcount = htons(1); - if ((int)alen > *buflenp) { - hp->tc = 1; - return (Finish); - } - memcpy(*cpp, anbuf, alen); - *cpp += alen; - *buflenp -= alen; - return (Finish); -} - -/* - * Test a datum for validity and return non-zero if it is out of date. - */ -int -stale(struct databuf *dp) { - struct zoneinfo *zp = &zones[dp->d_zone]; - -#ifdef CHECK_MAGIC - INSIST(dp->d_magic == DATABUF_MAGIC); -#endif - - switch (zp->z_type) { - - case z_master: - return (0); - -#ifdef STUBS - case z_stub: - /* root stub zones have DB_F_HINT set */ - if (dp->d_flags & DB_F_HINT) - return (0); - /* FALLTROUGH */ -#endif - case z_slave: - /* - * Check to see whether a slave zone has expired or - * time warped; if so clear authority flag for zone, - * schedule the zone for immediate maintenance, and - * return true. - */ - if ((int32_t)(tt.tv_sec - zp->z_lastupdate) - > (int32_t)zp->z_expire) { - ns_debug(ns_log_default, 1, - "stale: slave zone %s expired", - zp->z_origin); - if (!haveComplained((u_long)zp, (u_long)stale)) { - ns_notice(ns_log_default, - "slave zone \"%s\" expired", - zp->z_origin); - } - zp->z_flags &= ~Z_AUTH; - if ((zp->z_flags & (Z_QSERIAL|Z_XFER_RUNNING)) == 0) { - zp->z_time = tt.tv_sec; - sched_zone_maint(zp); - } - return (1); - } - if (zp->z_lastupdate > tt.tv_sec) { - if (!haveComplained((u_long)zp, (u_long)stale)) { - ns_notice(ns_log_default, - "slave zone \"%s\" time warp", - zp->z_origin); - } - zp->z_flags &= ~Z_AUTH; - if ((zp->z_flags & (Z_QSERIAL|Z_XFER_RUNNING)) == 0) { - zp->z_time = tt.tv_sec; - sched_zone_maint(zp); - } - return (1); - } - return (0); - - case z_hint: - case z_cache: - if (dp->d_flags & DB_F_HINT || - dp->d_ttl >= (u_int32_t)tt.tv_sec) - return (0); - ns_debug(ns_log_default, 3, "stale: ttl %d %ld (x%lx)", - dp->d_ttl, (long)(dp->d_ttl - tt.tv_sec), - (u_long)dp->d_flags); - return (1); - - default: - /* FALLTHROUGH */ ; - } - panic("stale: impossible condition", NULL); - /* NOTREACHED */ - return (0); /* Make gcc happy. */ -} - -/* - * Copy databuf into a resource record for replies. - * Return size of RR if OK, -1 if buffer is full. - */ -int -make_rr(const char *name, struct databuf *dp, u_char *buf, - int buflen, int doadd, u_char **comp_ptrs, u_char **edp, - int use_minimum) -{ - u_char *cp; - u_char *cp1, *sp; - struct zoneinfo *zp; - int32_t n; - int16_t type = dp->d_type; - u_int32_t ttl; - u_char naptr_flag; - - ns_debug(ns_log_default, 5, - "make_rr(%s, %lx, %lx, %d, %d) %d zone %d ttl %lu", - name, (u_long)dp, (u_long)buf, - buflen, doadd, dp->d_size, dp->d_zone, (u_long)dp->d_ttl); - - if (dp->d_rcode && dp->d_size == 0) - panic("make_rr: impossible d_rcode value", NULL); - - zp = &zones[dp->d_zone]; - /* check for outdated RR before updating comp_ptrs[] by dn_comp() */ - if (zp->z_type == Z_CACHE) { - if ((dp->d_flags & DB_F_HINT) != 0 - || dp->d_ttl < (u_int32_t)tt.tv_sec) { - ttl = 0; - } else - ttl = dp->d_ttl - (u_int32_t) tt.tv_sec; - } else { - if (dp->d_ttl != USE_MINIMUM && !use_minimum) - ttl = dp->d_ttl; - else - ttl = zp->z_minimum; /* really default */ - } - - buflen -= RRFIXEDSZ; - if (buflen < 0) - return (-1); -#ifdef RETURNSOA - if (dp->d_rcode) { - name = (char *)dp->d_data; - name += strlen(name) +1; - name += strlen(name) +1; - name += 5 * INT32SZ; - type = T_SOA; - } -#endif - if ((n = dn_comp(name, buf, buflen, comp_ptrs, edp)) < 0) - goto cleanup; - cp = buf + n; - buflen -= n; - if (buflen < 0) - goto cleanup; - PUTSHORT((u_int16_t)type, cp); - PUTSHORT((u_int16_t)dp->d_class, cp); - PUTLONG(ttl, cp); - sp = cp; - cp += INT16SZ; - switch (type) { - case T_CNAME: - case T_MG: - case T_MR: - case T_PTR: - n = dn_comp((char *)dp->d_data, cp, buflen, comp_ptrs, edp); - if (n < 0) - goto cleanup; - PUTSHORT((u_int16_t)n, sp); - cp += n; - break; - - case T_MB: - case T_NS: - /* Store domain name in answer */ - n = dn_comp((char *)dp->d_data, cp, buflen, comp_ptrs, edp); - if (n < 0) - goto cleanup; - PUTSHORT((u_int16_t)n, sp); - cp += n; - if (doadd) { - addname((char*)dp->d_data, name, - type, T_A, dp->d_class); - addname(name, name, type, T_KEY, dp->d_class); - } - break; - - case T_SOA: - case T_MINFO: - case T_RP: - cp1 = dp->d_data; - n = dn_comp((char *)cp1, cp, buflen, comp_ptrs, edp); - if (n < 0) - goto cleanup; - cp += n; - buflen -= type == T_SOA ? n + 5 * INT32SZ : n; - if (buflen < 0) - goto cleanup; - cp1 += strlen((char *)cp1) + 1; - n = dn_comp((char *)cp1, cp, buflen, comp_ptrs, edp); - if (n < 0) - goto cleanup; - cp += n; - if (type == T_SOA) { - cp1 += strlen((char *)cp1) + 1; -#ifdef BIND_UPDATE - if (zp->z_flags & Z_NEED_SOAUPDATE) - if (incr_serial(zp) < 0) - ns_error(ns_log_default, - "error updating serial number for %s from %d", - zp->z_origin, zp->z_serial); -#endif - n = 5 * INT32SZ; - memcpy(cp, cp1, n); - cp += n; - if (doadd) - addname(name, name, type, T_KEY, dp->d_class); - } - n = (u_int16_t)((cp - sp) - INT16SZ); - PUTSHORT((u_int16_t)n, sp); - break; - - case T_NAPTR: - /* cp1 == our data/ cp == data of RR */ - cp1 = dp->d_data; - - /* copy order */ - buflen -= INT16SZ; - if (buflen < 0) - goto cleanup; - memcpy(cp, cp1, INT16SZ); - cp += INT16SZ; - cp1 += INT16SZ; - n = (u_int16_t)((cp - sp) - INT16SZ); - ns_debug(ns_log_default, 1, "current size n = %u", n); - - /* copy preference */ - buflen -= INT16SZ; - if (buflen < 0) - goto cleanup; - memcpy(cp, cp1, INT16SZ); - cp += INT16SZ; - cp1 += INT16SZ; - n = (u_int16_t)((cp - sp) - INT16SZ); - ns_debug(ns_log_default, 1, "current size n = %u", n); - - /* Flags */ - n = *cp1++; - ns_debug(ns_log_default, 1, "size of n at flags = %d", n); - buflen -= n + 1; - if (buflen < 0) - goto cleanup; - naptr_flag = (n == 1) ? *cp1 : 0; - *cp++ = n; - memcpy(cp, cp1, n); - cp += n; - cp1 += n; - n = (u_int16_t)((cp - sp) - INT16SZ); - ns_debug(ns_log_default, 1, "current size n = %u", n); - - /* Service */ - n = *cp1++; - buflen -= n + 1; - if (buflen < 0) - goto cleanup; - *cp++ = n; - memcpy(cp, cp1, n); - cp += n; - cp1 += n; - n = (u_int16_t)((cp - sp) - INT16SZ); - ns_debug(ns_log_default, 1, "current size n = %u", n); - - /* Regexp */ - n = *cp1++; - buflen -= n + 1; - if (buflen < 0) - goto cleanup; - *cp++ = n; - memcpy(cp, cp1, n); - cp += n; - cp1 += n; - n = (u_int16_t)((cp - sp) - INT16SZ); - ns_debug(ns_log_default, 1, "current size n = %u", n); - - /* Replacement */ - ns_debug(ns_log_default, 1, "Replacement = %s", cp1); - n = dn_comp((char *)cp1, cp, buflen, NULL, NULL); - ns_debug(ns_log_default, 1, "dn_comp's n = %u", n); - if (n < 0) - goto cleanup; - cp += n; - if (doadd && *cp1 != 0) { - if (naptr_flag == 's' || naptr_flag == 'S') - addname((char*)cp1, name, type, T_SRV, - dp->d_class); - if (naptr_flag == 'a' || naptr_flag == 'A') - addname((char*)cp1, name, type, T_A, - dp->d_class); - } - - /* save data length */ - n = (u_int16_t)((cp - sp) - INT16SZ); - ns_debug(ns_log_default, 1, "saved size n = %u", n); - PUTSHORT((u_int16_t)n, sp); - - break; - - case T_MX: - case T_AFSDB: - case T_RT: - case T_SRV: - /* cp1 == our data/ cp == data of RR */ - cp1 = dp->d_data; - - if ((buflen -= INT16SZ) < 0) - goto cleanup; - - /* copy preference */ - memcpy(cp, cp1, INT16SZ); - cp += INT16SZ; - cp1 += INT16SZ; - - if (type == T_SRV) { - buflen -= INT16SZ*2; - if (buflen < 0) - goto cleanup; - memcpy(cp, cp1, INT16SZ*2); - cp += INT16SZ*2; - cp1 += INT16SZ*2; - } - - n = dn_comp((char *)cp1, cp, buflen, - (type == ns_t_mx) ? comp_ptrs : NULL, - (type == ns_t_mx) ? edp : NULL); - if (n < 0) - goto cleanup; - cp += n; - - /* save data length */ - n = (u_int16_t)((cp - sp) - INT16SZ); - PUTSHORT((u_int16_t)n, sp); - if (doadd) - addname((char*)cp1, name, type, T_A, dp->d_class); - break; - - case T_PX: - cp1 = dp->d_data; - - if ((buflen -= INT16SZ) < 0) - goto cleanup; - - /* copy preference */ - memcpy(cp, cp1, INT16SZ); - cp += INT16SZ; - cp1 += INT16SZ; - - n = dn_comp((char *)cp1, cp, buflen, comp_ptrs, edp); - if (n < 0) - goto cleanup; - cp += n; - buflen -= n; - cp1 += strlen((char *)cp1) + 1; - n = dn_comp((char *)cp1, cp, buflen, comp_ptrs, edp); - if (n < 0) - goto cleanup; - cp += n; - - /* save data length */ - n = (u_int16_t)((cp - sp) - INT16SZ); - PUTSHORT((u_int16_t)n, sp); - break; - - case T_SIG: - /* cp1 == our data; cp == data of target RR */ - cp1 = dp->d_data; - - /* first just copy over the type_covered, algorithm, */ - /* labels, orig ttl, two timestamps, and the footprint */ - if (buflen < 18) - goto cleanup; /* out of room! */ - memcpy(cp, cp1, 18); - cp += 18; - cp1 += 18; - buflen -= 18; - - /* then the signer's name */ - n = dn_comp((char *)cp1, cp, buflen, NULL, NULL); - if (n < 0) - goto cleanup; - cp += n; - buflen -= n; - cp1 += strlen((char*)cp1)+1; - - /* finally, we copy over the variable-length signature */ - n = dp->d_size - (u_int16_t)((cp1 - dp->d_data)); - if (n > buflen) - goto cleanup; /* out of room! */ - memcpy(cp, cp1, n); - cp += n; - - /* save data length & return */ - n = (u_int16_t)((cp - sp) - INT16SZ); - PUTSHORT((u_int16_t)n, sp); - break; - - case T_NXT: - cp1 = dp->d_data; - n = dn_comp((char *)cp1, cp, buflen, NULL, NULL); - if (n < 0) - goto cleanup; - - cp += n; - buflen -=n; - cp1 += strlen((char *)cp1) + 1; - - /* copy nxt bit map */ - n = dp->d_size - (u_int16_t)((cp1 - dp->d_data)); - if (n > buflen) - goto cleanup; /* out of room! */ - memcpy(cp, cp1, n); - cp += n; - buflen -= n; - - n = (u_int16_t)((cp - sp) - INT16SZ); - PUTSHORT((u_int16_t)n, sp); - - break; - - default: - if ((type == T_A || type == T_AAAA) && doadd) - addname(name, name, type, T_KEY, dp->d_class); - if (dp->d_size > buflen) - goto cleanup; - memcpy(cp, dp->d_data, dp->d_size); - PUTSHORT((u_int16_t)dp->d_size, sp); - cp += dp->d_size; - } - return (cp - buf); - - cleanup: - /* Rollback RR. */ - ns_name_rollback(buf, (const u_char **)comp_ptrs, - (const u_char **)edp); - return (-1); -} - -static void -addname(const char *dname, const char *rname, - u_int16_t rtype, u_int16_t type, u_int16_t class) -{ - struct addinfo *ap; - int n; - - for (ap = addinfo, n = addcount; --n >= 0; ap++) - if (ns_samename(ap->a_dname, dname) == 1 && ap->a_type == type) - return; - - /* add domain name to additional section */ - if (addcount < NADDRECS) { - addcount++; - ap->a_dname = savestr(dname, 1); - ap->a_rname = savestr(rname, 1); - ap->a_rtype = rtype; - ap->a_type = type; - ap->a_class = class; - } -} - -/* - * Lookup addresses/keys for names in addinfo and put into the message's - * additional section. - */ -int -doaddinfo(HEADER *hp, u_char *msg, int msglen) { - register struct namebuf *np; - register struct databuf *dp; - register struct addinfo *ap; - register u_char *cp; - struct hashbuf *htp; - const char *fname; - register int n, count; - register int ns_logging; - int pass = 0; - int i, doadd; - - - if (!addcount) - return (0); - - ns_logging = ns_wouldlog(ns_log_default, 3); - - if (ns_logging) - ns_debug(ns_log_default, 3, - "doaddinfo() addcount = %d", addcount); - - if (hp->tc) { - ns_debug(ns_log_default, 4, - "doaddinfo(): tc already set, bailing"); - return (0); - } - - count = 0; - cp = msg; -loop: - for (ap = addinfo, i = 0; i < addcount; ap++, i++) { - int auth = 0, - drop = 0, - founda = 0, - foundaaaa = 0, - foundcname = 0, - save_count = count, - save_msglen = msglen; - u_char *save_cp = cp; - - if ((pass != 0 && - (pass != 1 || server_options->preferred_glue == 0) && - ap->a_type == T_A) || - (pass != 0 && ap->a_type == T_SRV) || - (pass != 2 && ap->a_type == T_KEY)) - continue; - if (ns_logging) - ns_debug(ns_log_default, 3, - "do additional \"%s\" (from \"%s\")", - ap->a_dname, ap->a_rname); - htp = hashtab; /* because "nlookup" stomps on arg. */ - np = nlookup(ap->a_dname, &htp, &fname, 0); - if (np == NULL || fname != ap->a_dname) - goto next_rr; - if (ns_logging) - ns_debug(ns_log_default, 3, "found it"); - /* look for the data */ - (void)delete_stale(np); - for (dp = np->n_data; dp != NULL; dp = dp->d_next) { - if (dp->d_class != ap->a_class) - continue; - if (dp->d_rcode == NXDOMAIN) { - founda = foundaaaa = 1; - continue; - } - switch (dp->d_type) { - case ns_t_a: founda = 1; break; - case ns_t_aaaa: foundaaaa = 1; break; - } - if (!dp->d_rcode && dp->d_type == T_CNAME) { - foundcname++; - break; - } - if (auth == 0 && ap->a_type == T_A && - (dp->d_type == ns_t_a || dp->d_type == ns_t_aaaa) && - (zones[dp->d_zone].z_type == z_master || - zones[dp->d_zone].z_type == z_slave)) - auth = 1; - if (pass == 0 && ap->a_type == T_A && - server_options->preferred_glue != 0 && - !match(dp, (int)ap->a_class, - server_options->preferred_glue)) { - continue; - } - if (pass != 0 && ap->a_type == T_A && - server_options->preferred_glue != 0 && - match(dp, (int)ap->a_class, - server_options->preferred_glue)) { - continue; - } - if (ap->a_type == T_A && - !match(dp, (int)ap->a_class, T_A) && - !match(dp, (int)ap->a_class, T_AAAA)) { - continue; - } - if (ap->a_type == T_KEY && - !match(dp, (int)ap->a_class, T_KEY)) - continue; - if (ap->a_type == T_SRV && - !match(dp, (int)ap->a_class, T_SRV)) - continue; - if (dp->d_rcode) - continue; - if (drop) - continue; - /* - * Should be smart and eliminate duplicate - * data here. XXX - */ - doadd = 0; - if (ap->a_type == T_SRV) - doadd = 1; - if ((n = make_rr(ap->a_dname, dp, cp, msglen, doadd, - dnptrs, dnptrs_end, 0)) < 0) { - /* truncation in the additional-data section - * is not all that serious. we do not set TC, - * since the answer and authority sections are - * OK; however, since we're not setting TC we - * have to make sure that none of the RR's for - * this name go out (!TC implies that all - * {name,type} appearances are complete -- and - * since we only do A RR's here, the name is - * the key). vixie, 23apr93 - */ - ns_debug(ns_log_default, 5, - "addinfo: not enough room, remaining msglen = %d", - save_msglen); - /* Rollback RRset. */ - ns_name_rollback(save_cp, - (const u_char **)dnptrs, - (const u_char **)dnptrs_end); - cp = save_cp; - msglen = save_msglen; - count = save_count; - /* - * Continue processing list to prevent - * unnecessary fetches for glue. - * Prevent partial RRsets being sent by - * setting drop. - */ - drop = 1; - continue; - } - ns_debug(ns_log_default, 5, - "addinfo: adding address data n = %d", n); - cp += n; - msglen -= n; - count++; - } - next_rr: - if (!NS_OPTION_P(OPTION_NOFETCHGLUE) && - !foundcname && ap->a_type == T_A) { - /* ask a real server for this info */ - if (!founda && !auth) - (void) sysquery(ap->a_dname, (int)ap->a_class, - ns_t_a, NULL, NULL, 0, ns_port, - QUERY, 0); - if (!foundaaaa && !auth) - (void) sysquery(ap->a_dname, (int)ap->a_class, - ns_t_aaaa, NULL, NULL, 0, - ns_port, QUERY, 0); - } - if (foundcname) { - if (!haveComplained(nhash(ap->a_dname), - nhash(ap->a_rname))) { - ns_info(ns_log_cname, - "\"%s %s %s\" points to a CNAME (%s)", - ap->a_rname, p_class(ap->a_class), - p_type(ap->a_rtype), ap->a_dname); - } - } - } - if (pass++ < 2) - goto loop; /* now do the KEYs... */ - hp->arcount = htons((u_int16_t)count); - for (ap = addinfo, i = 0; i < addcount; ap++, i++) { - ap->a_dname = freestr(ap->a_dname); - ap->a_rname = freestr(ap->a_rname); - } - addcount = 0; - return (cp - msg); -} - -int -doaddauth(HEADER *hp, u_char *cp, int buflen, - struct namebuf *np, struct databuf *dp) -{ - char dnbuf[MAXDNAME]; - int n; - - getname(np, dnbuf, sizeof dnbuf); - if (stale(dp)) { - ns_debug(ns_log_default, 1, - "doaddauth: can't add stale '%s' (%d)", - dnbuf, buflen); - return (0); - } - n = make_rr(dnbuf, dp, cp, buflen, 1, dnptrs, dnptrs_end, 1); - if (n <= 0) { - ns_debug(ns_log_default, 1, - "doaddauth: can't add oversize '%s' (%d) (n=%d)", - dnbuf, buflen, n); - if (n < 0) { - hp->tc = 1; - } - return (0); - } - if (dp->d_secure != DB_S_SECURE) - hp->ad = 0; - hp->nscount = htons(ntohs(hp->nscount) + 1); - return (n); -} - -void -free_addinfo() { - struct addinfo *ap; - - for (ap = addinfo; --addcount >= 0; ap++) { - ap->a_dname = freestr(ap->a_dname); - ap->a_rname = freestr(ap->a_rname); - } - addcount = 0; -} - -void -free_nsp(struct databuf **nsp) { - while (*nsp) - db_detach(nsp++); -} - -static void -copyCharString(u_char **dst, const char *src) { - size_t len = strlen(src) & 0xff; - *(*dst)++ = (u_char) len; - memcpy(*dst, src, len); - *dst += len; -} - -/* - * Questionable source ports for queries / responses. - */ -int -drop_port(u_int16_t port) { - switch (port) { - case 7: /* echo */ - case 13: /* daytime */ - case 19: /* chargen */ - case 37: /* time */ - return (1); - case 464: /* kpasswd */ - return (2); - } - return (0); -} |
