--- /dev/null
+#!/usr/bin/perl
+#
+# Copyright (C) 2011 Internet Systems Consortium, Inc. ("ISC")
+#
+# Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
+# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS. IN NO EVENT SHALL ISC 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.
+
+# $Id: ans.pl,v 1.2 2011/08/31 06:49:10 marka Exp $
+
+#
+# This is the name server from hell. It provides canned
+# responses based on pattern matching the queries, and
+# can be reprogrammed on-the-fly over a TCP connection.
+#
+# The server listens for control connections on port 5301.
+# A control connection is a TCP stream of lines like
+#
+# /pattern/
+# name ttl type rdata
+# name ttl type rdata
+# ...
+# /pattern/
+# name ttl type rdata
+# name ttl type rdata
+# ...
+#
+# There can be any number of patterns, each associated
+# with any number of response RRs. Each pattern is a
+# Perl regular expression.
+#
+# Each incoming query is converted into a string of the form
+# "qname qtype" (the printable query domain name, space,
+# printable query type) and matched against each pattern.
+#
+# The first pattern matching the query is selected, and
+# the RR following the pattern line are sent in the
+# answer section of the response.
+#
+# Each new control connection causes the current set of
+# patterns and responses to be cleared before adding new
+# ones.
+#
+# The server handles UDP and TCP queries. Zone transfer
+# responses work, but must fit in a single 64 k message.
+#
+# Now you can add TSIG, just specify key/key data with:
+#
+# /pattern <key> <key_data>/
+# name ttl type rdata
+# name ttl type rdata
+#
+# Note that this data will still be sent with any request for
+# pattern, only this data will be signed. Currently, this is only
+# done for TCP.
+
+
+use IO::File;
+use IO::Socket;
+use Data::Dumper;
+use Net::DNS;
+use Net::DNS::Packet;
+use strict;
+
+# Ignore SIGPIPE so we won't fail if peer closes a TCP socket early
+local $SIG{PIPE} = 'IGNORE';
+
+# Flush logged output after every line
+local $| = 1;
+
+my $server_addr = "10.53.0.4";
+
+my $udpsock = IO::Socket::INET->new(LocalAddr => "$server_addr",
+ LocalPort => 5300, Proto => "udp", Reuse => 1) or die "$!";
+
+my $tcpsock = IO::Socket::INET->new(LocalAddr => "$server_addr",
+ LocalPort => 5300, Proto => "tcp", Listen => 5, Reuse => 1) or die "$!";
+
+print "listening on $server_addr:5300.\n";
+
+my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!";
+print $pidf "$$\n" or die "cannot write pid file: $!";
+$pidf->close or die "cannot close pid file: $!";;
+sub rmpid { unlink "ans.pid"; exit 1; };
+
+$SIG{INT} = \&rmpid;
+$SIG{TERM} = \&rmpid;
+
+#my @answers = ();
+my @rules;
+sub handleUDP {
+ my ($buf) = @_;
+
+ my ($packet, $err) = new Net::DNS::Packet(\$buf, 0);
+ $err and die $err;
+
+ $packet->header->qr(1);
+ $packet->header->aa(1);
+
+ my @questions = $packet->question;
+ my $qname = $questions[0]->qname;
+ my $qtype = $questions[0]->qtype;
+
+ # get the existing signature if any, and clear the additional section
+ my $prev_tsig;
+ while (my $rr = $packet->pop("additional")) {
+ if ($rr->type eq "TSIG") {
+ $prev_tsig = $rr;
+ }
+ }
+
+ my $r;
+ foreach $r (@rules) {
+ my $pattern = $r->{pattern};
+ my($dbtype, $key_name, $key_data) = split(/ /,$pattern);
+ print "[handleUDP] $dbtype, $key_name, $key_data \n";
+ if ("$qname $qtype" =~ /$dbtype/) {
+ my $a;
+ foreach $a (@{$r->{answer}}) {
+ $packet->push("answer", $a);
+ }
+ if(defined($key_name) && defined($key_data)) {
+ # Sign the packet
+ print " Signing the response with " .
+ "$key_name/$key_data\n";
+ my $tsig = Net::DNS::RR->
+ new("$key_name TSIG $key_data");
+
+ # These kluges are necessary because Net::DNS
+ # doesn't know how to sign responses. We
+ # clear compnames so that the TSIG key and
+ # algorithm name won't be compressed, and
+ # add one to arcount because the signing
+ # function will attempt to decrement it,
+ # which is incorrect in a response. Finally
+ # we set request_mac to the previous digest.
+ $packet->{"compnames"} = {};
+ $packet->{"header"}{"arcount"} += 1;
+ if (defined($prev_tsig)) {
+ my $rmac = pack('n H*',
+ $prev_tsig->mac_size,
+ $prev_tsig->mac);
+ $tsig->{"request_mac"} =
+ unpack("H*", $rmac);
+ }
+
+ $packet->sign_tsig($tsig);
+ }
+ last;
+ }
+ }
+ #$packet->print;
+
+ return $packet->data;
+}
+
+# namelen:
+# given a stream of data, reads a DNS-formatted name and returns its
+# total length, thus making it possible to skip past it.
+sub namelen {
+ my ($data) = @_;
+ my $len = 0;
+ my $label_len = 0;
+ do {
+ $label_len = unpack("c", $data);
+ $data = substr($data, $label_len + 1);
+ $len += $label_len + 1;
+ } while ($label_len != 0);
+ return ($len);
+}
+
+# packetlen:
+# given a stream of data, reads a DNS wire-format packet and returns
+# its total length, making it possible to skip past it.
+sub packetlen {
+ my ($data) = @_;
+ my $q;
+ my $rr;
+
+ my ($header, $offset) = Net::DNS::Header->parse(\$data);
+ for (1 .. $header->qdcount) {
+ ($q, $offset) = Net::DNS::Question->parse(\$data, $offset);
+ }
+ for (1 .. $header->ancount) {
+ ($rr, $offset) = Net::DNS::RR->parse(\$data, $offset);
+ }
+ for (1 .. $header->nscount) {
+ ($rr, $offset) = Net::DNS::RR->parse(\$data, $offset);
+ }
+ for (1 .. $header->arcount) {
+ ($rr, $offset) = Net::DNS::RR->parse(\$data, $offset);
+ }
+ return $offset;
+}
+
+# sign_tcp_continuation:
+# This is a hack to correct the problem that Net::DNS has no idea how
+# to sign multiple-message TCP responses. Several data that are included
+# in the digest when signing a query or the first message of a response are
+# omitted when signing subsequent messages in a TCP stream.
+#
+# Net::DNS::Packet->sign_tsig() has the ability to use a custom signing
+# function (specified by calling Packet->sign_func()). We use this
+# function as the signing function for TCP continuations, and it removes
+# the unwanted data from the digest before calling the default sign_hmac
+# function.
+sub sign_tcp_continuation {
+ my ($key, $data) = @_;
+
+ # copy out first two bytes: size of the previous MAC
+ my $rmacsize = unpack("n", $data);
+ $data = substr($data, 2);
+
+ # copy out previous MAC
+ my $rmac = substr($data, 0, $rmacsize);
+ $data = substr($data, $rmacsize);
+
+ # try parsing out the packet information
+ my $plen = packetlen($data);
+ my $pdata = substr($data, 0, $plen);
+ $data = substr($data, $plen);
+
+ # remove the keyname, ttl, class, and algorithm name
+ $data = substr($data, namelen($data));
+ $data = substr($data, 6);
+ $data = substr($data, namelen($data));
+
+ # preserve the TSIG data
+ my $tdata = substr($data, 0, 8);
+
+ # prepare a new digest and sign with it
+ $data = pack("n", $rmacsize) . $rmac . $pdata . $tdata;
+ return Net::DNS::RR::TSIG::sign_hmac($key, $data);
+}
+
+sub handleTCP {
+ my ($buf) = @_;
+
+ my ($packet, $err) = new Net::DNS::Packet(\$buf, 0);
+ $err and die $err;
+
+ $packet->header->qr(1);
+ $packet->header->aa(1);
+
+ my @questions = $packet->question;
+ my $qname = $questions[0]->qname;
+ my $qtype = $questions[0]->qtype;
+
+ # get the existing signature if any, and clear the additional section
+ my $prev_tsig;
+ my $signer;
+ while (my $rr = $packet->pop("additional")) {
+ if ($rr->type eq "TSIG") {
+ $prev_tsig = $rr;
+ }
+ }
+
+ my @results = ();
+ my $count_these = 0;
+
+ my $r;
+ foreach $r (@rules) {
+ my $pattern = $r->{pattern};
+ my($dbtype, $key_name, $key_data) = split(/ /,$pattern);
+ print "[handleTCP] $dbtype, $key_name, $key_data \n";
+ if ("$qname $qtype" =~ /$dbtype/) {
+ $count_these++;
+ my $a;
+ foreach $a (@{$r->{answer}}) {
+ $packet->push("answer", $a);
+ }
+ if(defined($key_name) && defined($key_data)) {
+ # sign the packet
+ print " Signing the data with " .
+ "$key_name/$key_data\n";
+
+ my $tsig = Net::DNS::RR->
+ new("$key_name TSIG $key_data");
+
+ # These kluges are necessary because Net::DNS
+ # doesn't know how to sign responses. We
+ # clear compnames so that the TSIG key and
+ # algorithm name won't be compressed, and
+ # add one to arcount because the signing
+ # function will attempt to decrement it,
+ # which is incorrect in a response. Finally
+ # we set request_mac to the previous digest.
+ $packet->{"compnames"} = {};
+ $packet->{"header"}{"arcount"} += 1;
+ if (defined($prev_tsig)) {
+ my $rmac = pack('n H*',
+ $prev_tsig->mac_size,
+ $prev_tsig->mac);
+ $tsig->{"request_mac"} =
+ unpack("H*", $rmac);
+ }
+
+ $tsig->sign_func($signer) if defined($signer);
+ $packet->sign_tsig($tsig);
+ $signer = \&sign_tcp_continuation;
+
+ my $copy =
+ Net::DNS::Packet->new(\($packet->data));
+ $prev_tsig = $copy->pop("additional");
+ }
+ #$packet->print;
+ push(@results,$packet->data);
+ $packet = new Net::DNS::Packet(\$buf, 0);
+ $packet->header->qr(1);
+ $packet->header->aa(1);
+ }
+ }
+ print " A total of $count_these patterns matched\n";
+ return \@results;
+}
+
+# Main
+my $rin;
+my $rout;
+for (;;) {
+ $rin = '';
+ vec($rin, fileno($tcpsock), 1) = 1;
+ vec($rin, fileno($udpsock), 1) = 1;
+
+ select($rout = $rin, undef, undef, undef);
+
+ if (vec($rout, fileno($udpsock), 1)) {
+ printf "UDP request\n";
+ my $buf;
+ $udpsock->recv($buf, 512);
+ } elsif (vec($rout, fileno($tcpsock), 1)) {
+ my $conn = $tcpsock->accept;
+ my $buf;
+ for (;;) {
+ my $lenbuf;
+ my $n = $conn->sysread($lenbuf, 2);
+ last unless $n == 2;
+ my $len = unpack("n", $lenbuf);
+ $n = $conn->sysread($buf, $len);
+ }
+ sleep(1);
+ }
+}
* PERFORMANCE OF THIS SOFTWARE.
*/
-/* $Id: zone.c,v 1.627 2011/08/30 23:46:52 tbox Exp $ */
+/* $Id: zone.c,v 1.628 2011/08/31 06:49:10 marka Exp $ */
/*! \file */
typedef struct dns_stub dns_stub_t;
typedef struct dns_load dns_load_t;
typedef struct dns_forward dns_forward_t;
+typedef ISC_LIST(dns_forward_t) dns_forwardlist_t;
typedef struct dns_io dns_io_t;
typedef ISC_LIST(dns_io_t) dns_iolist_t;
typedef struct dns_signing dns_signing_t;
*/
dns_updatemethod_t updatemethod;
+ /*%
+ * Outstanding forwarded UPDATE requests.
+ */
+ dns_forwardlist_t forwards;
+
dns_zone_t *raw;
dns_zone_t *secure;
};
isc_sockaddr_t addr;
dns_updatecallback_t callback;
void *callback_arg;
+ ISC_LINK(dns_forward_t) link;
};
/*%
zone->privatetype = (dns_rdatatype_t)0xffffU;
zone->added = ISC_FALSE;
zone->rpz_zone = ISC_FALSE;
+ ISC_LIST_INIT(zone->forwards);
zone->raw = NULL;
zone->secure = NULL;
}
}
+static void
+forward_cancel(dns_zone_t *zone) {
+ dns_forward_t *forward;
+
+ /*
+ * 'zone' locked by caller.
+ */
+
+ REQUIRE(LOCKED_ZONE(zone));
+
+ for (forward = ISC_LIST_HEAD(zone->forwards);
+ forward != NULL;
+ forward = ISC_LIST_NEXT(forward, link)) {
+ if (forward->request != NULL)
+ dns_request_cancel(forward->request);
+ }
+}
+
static void
zone_unload(dns_zone_t *zone) {
REQUIRE(DNS_ZONE_VALID(zone));
INSIST(event->ev_type == DNS_EVENT_ZONECONTROL);
INSIST(isc_refcount_current(&zone->erefs) == 0);
+
zone_debuglog(zone, "zone_shutdown", 3, "shutting down");
/*
notify_cancel(zone);
+ forward_cancel(zone);
+
if (zone->timer != NULL) {
isc_timer_detach(&zone->timer);
INSIST(zone->irefs > 0);
dns_request_destroy(&forward->request);
if (forward->msgbuf != NULL)
isc_buffer_free(&forward->msgbuf);
- if (forward->zone != NULL)
+ if (forward->zone != NULL) {
+ LOCK(&forward->zone->lock);
+ if (ISC_LINK_LINKED(forward, link))
+ ISC_LIST_UNLINK(forward->zone->forwards, forward, link);
+ UNLOCK(&forward->zone->lock);
dns_zone_idetach(&forward->zone);
+ }
isc_mem_putanddetach(&forward->mctx, forward, sizeof(*forward));
}
isc_sockaddr_t src;
LOCK_ZONE(forward->zone);
+
+ if (DNS_ZONE_FLAG(forward->zone, DNS_ZONEFLG_EXITING)) {
+ UNLOCK_ZONE(forward->zone);
+ return (ISC_R_CANCELED);
+ }
+
if (forward->which >= forward->zone->masterscnt) {
UNLOCK_ZONE(forward->zone);
return (ISC_R_NOMORE);
forward->zone->task,
forward_callback, forward,
&forward->request);
+ if (result == ISC_R_SUCCESS) {
+ if (!ISC_LINK_LINKED(forward, link))
+ ISC_LIST_APPEND(forward->zone->forwards, forward, link);
+ }
+
unlock:
UNLOCK_ZONE(forward->zone);
return (result);
forward->mctx = 0;
forward->callback = callback;
forward->callback_arg = callback_arg;
+ ISC_LINK_INIT(forward, link);
forward->magic = FORWARD_MAGIC;
mr = dns_message_getrawmessage(msg);
void
dns_zonemgr_shutdown(dns_zonemgr_t *zmgr) {
+ dns_zone_t *zone;
+
REQUIRE(DNS_ZONEMGR_VALID(zmgr));
isc_ratelimiter_shutdown(zmgr->rl);
isc_task_destroy(&zmgr->task);
if (zmgr->zonetasks != NULL)
isc_taskpool_destroy(&zmgr->zonetasks);
+
+ RWLOCK(&zmgr->rwlock, isc_rwlocktype_read);
+ for (zone = ISC_LIST_HEAD(zmgr->zones);
+ zone != NULL;
+ zone = ISC_LIST_NEXT(zone, link))
+ {
+ LOCK_ZONE(zone);
+ forward_cancel(zone);
+ UNLOCK_ZONE(zone);
+ }
+ RWUNLOCK(&zmgr->rwlock, isc_rwlocktype_read);
+
}
isc_result_t
projects / thirdparty / bind9.git / commitdiff
