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diff --git a/bin/tests/system/start.pl b/bin/tests/system/start.pl
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+#!/usr/bin/perl -w
+
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+# Framework for starting test servers.
+# Based on the type of server specified, check for port availability, remove
+# temporary files, start the server, and verify that the server is running.
+# If a server is specified, start it. Otherwise, start all servers for test.
+
+use strict;
+use warnings;
+
+use Cwd ':DEFAULT', 'abs_path';
+use English '-no_match_vars';
+use Getopt::Long;
+use Time::HiRes 'sleep'; # allows sleeping fractional seconds
+
+# Usage:
+# perl start.pl [--noclean] [--restart] [--port port] [--taskset cpus] test [server [options]]
+#
+# --noclean Do not cleanup files in server directory.
+#
+# --restart Indicate that the server is being restarted, so get the
+# server to append output to an existing log file instead of
+# starting a new one.
+#
+# --port port Specify the default port being used by the server to answer
+# queries (default 5300). This script will interrogate the
+# server on this port to see if it is running. (Note: for
+# "named" nameservers, this can be overridden by the presence
+# of the file "named.port" in the server directory containing
+# the number of the query port.)
+#
+# --taskset cpus Use taskset to signal which cpus can be used. For example
+# cpus=fff0 means all cpus aexcept for 0, 1, 2, and 3 are
+# eligible.
+#
+# test Name of the test directory.
+#
+# server Name of the server directory. This will be of the form
+# "nsN" or "ansN", where "N" is an integer between 1 and 8.
+# If not given, the script will start all the servers in the
+# test directory.
+#
+# options Alternate options for the server.
+#
+# NOTE: options must be specified with '-- "<option list>"',
+# for instance: start.pl . ns1 -- "-c n.conf -d 43"
+#
+# ALSO NOTE: this variable will be filled with the contents
+# of the first non-commented/non-blank line of args in a file
+# called "named.args" in an ns*/ subdirectory. Only the FIRST
+# non-commented/non-blank line is used (everything else in
+# the file is ignored). If "options" is already set, then
+# "named.args" is ignored.
+
+my $usage = "usage: $0 [--noclean] [--restart] [--port <port>] [--taskset <cpus>] test-directory [server-directory [server-options]]";
+my $clean = 1;
+my $restart = 0;
+my $queryport = 5300;
+my $taskset = "";
+
+GetOptions(
+ 'clean!' => \$clean,
+ 'restart!' => \$restart,
+ 'port=i' => \$queryport,
+ 'taskset=s' => \$taskset,
+) or die "$usage\n";
+
+my( $test, $server_arg, $options_arg ) = @ARGV;
+
+if (!$test) {
+ die "$usage\n";
+}
+
+# Global variables
+my $topdir = abs_path($ENV{'SYSTEMTESTTOP'});
+my $testdir = abs_path($topdir . "/" . $test);
+
+if (! -d $testdir) {
+ die "No test directory: \"$testdir\"\n";
+}
+
+if ($server_arg && ! -d "$testdir/$server_arg") {
+ die "No server directory: \"$testdir/$server_arg\"\n";
+}
+
+my $NAMED = $ENV{'NAMED'};
+my $DIG = $ENV{'DIG'};
+my $PERL = $ENV{'PERL'};
+my $PYTHON = $ENV{'PYTHON'};
+
+# Start the server(s)
+
+my @ns;
+my @ans;
+
+if ($server_arg) {
+ if ($server_arg =~ /^ns/) {
+ push(@ns, $server_arg);
+ } elsif ($server_arg =~ /^ans/) {
+ push(@ans, $server_arg);
+ } else {
+ print "$0: ns or ans directory expected";
+ print "I:$test:failed";
+ }
+} else {
+ # Determine which servers need to be started for this test.
+ opendir DIR, $testdir or die "unable to read test directory: \"$test\" ($OS_ERROR)\n";
+ my @files = sort readdir DIR;
+ closedir DIR;
+
+ @ns = grep /^ns[0-9]*$/, @files;
+ @ans = grep /^ans[0-9]*$/, @files;
+}
+
+# Start the servers we found.
+
+foreach my $name(@ns) {
+ my $instances_so_far = count_running_lines($name);
+ &check_ns_port($name);
+ &start_ns_server($name, $options_arg);
+ &verify_ns_server($name, $instances_so_far);
+}
+
+foreach my $name(@ans) {
+ &start_ans_server($name);
+}
+
+# Subroutines
+
+sub read_ns_port {
+ my ( $server ) = @_;
+ my $port = $queryport;
+ my $options = "";
+
+ if ($server) {
+ my $file = $testdir . "/" . $server . "/named.port";
+
+ if (-e $file) {
+ open(my $fh, "<", $file) or die "unable to read ports file \"$file\" ($OS_ERROR)";
+
+ my $line = <$fh>;
+
+ if ($line) {
+ chomp $line;
+ $port = $line;
+ }
+ }
+ }
+ return ($port);
+}
+
+sub check_ns_port {
+ my ( $server ) = @_;
+ my $options = "";
+ my $port = read_ns_port($server);
+
+ if ($server =~ /(\d+)$/) {
+ $options = "-i $1";
+ }
+
+ my $tries = 0;
+
+ while (1) {
+ my $return = system("$PERL $topdir/testsock.pl -p $port $options");
+
+ if ($return == 0) {
+ last;
+ }
+
+ $tries++;
+
+ if ($tries > 4) {
+ print "$0: could not bind to server addresses, still running?\n";
+ print "I:$test:server sockets not available\n";
+ print "I:$test:failed\n";
+
+ system("$PERL $topdir/stop.pl $test"); # Is this the correct behavior?
+
+ exit 1;
+ }
+
+ print "I:$test:Couldn't bind to socket (yet)\n";
+ sleep 2;
+ }
+}
+
+sub start_server {
+ my ( $server, $command, $pid_file ) = @_;
+
+ chdir "$testdir/$server" or die "unable to chdir \"$testdir/$server\" ($OS_ERROR)\n";
+
+ # start the server
+ my $child = `$command`;
+ chomp($child);
+
+ # wait up to 14 seconds for the server to start and to write the
+ # pid file otherwise kill this server and any others that have
+ # already been started
+ my $tries = 0;
+ while (!-s $pid_file) {
+ if (++$tries > 140) {
+ print "I:$test:Couldn't start server $command (pid=$child)\n";
+ print "I:$test:failed\n";
+ kill "ABRT", $child if ("$child" ne "");
+ chdir "$testdir";
+ system "$PERL $topdir/stop.pl $test";
+ exit 1;
+ }
+ sleep 0.1;
+ }
+
+ # go back to the top level directory
+ chdir $topdir;
+}
+
+sub construct_ns_command {
+ my ( $server, $options ) = @_;
+
+ my $command;
+
+ if ($ENV{'USE_VALGRIND'}) {
+ $command = "valgrind -q --gen-suppressions=all --num-callers=48 --fullpath-after= --log-file=named-$server-valgrind-%p.log ";
+
+ if ($ENV{'USE_VALGRIND'} eq 'helgrind') {
+ $command .= "--tool=helgrind ";
+ } else {
+ $command .= "--tool=memcheck --track-origins=yes --leak-check=full ";
+ }
+
+ $command .= "$NAMED -m none -M external ";
+ } else {
+ if ($taskset) {
+ $command = "taskset $taskset $NAMED ";
+ } else {
+ $command = "$NAMED ";
+ }
+ }
+
+ my $args_file = $testdir . "/" . $server . "/" . "named.args";
+
+ if ($options) {
+ $command .= $options;
+ } elsif (-e $args_file) {
+ open(my $fh, "<", $args_file) or die "unable to read args_file \"$args_file\" ($OS_ERROR)\n";
+
+ while(my $line=<$fh>) {
+ next if ($line =~ /^\s*$/); #discard blank lines
+ next if ($line =~ /^\s*#/); #discard comment lines
+
+ chomp $line;
+
+ $line =~ s/#.*$//;
+
+ $command .= $line;
+
+ last;
+ }
+ } else {
+ $command .= "-D $test-$server ";
+ $command .= "-X named.lock ";
+ $command .= "-m record,size,mctx ";
+
+ foreach my $t_option(
+ "dropedns", "ednsformerr", "ednsnotimp", "ednsrefused",
+ "noaa", "noedns", "nosoa", "maxudp512", "maxudp1460",
+ ) {
+ if (-e "$testdir/$server/named.$t_option") {
+ $command .= "-T $t_option "
+ }
+ }
+
+ $command .= "-c named.conf -d 99 -g -U 4 -T maxcachesize=2097152";
+ }
+
+ if (-e "$testdir/$server/named.notcp") {
+ $command .= " -T notcp"
+ }
+
+ if ($restart) {
+ $command .= " >>named.run 2>&1 &";
+ } else {
+ $command .= " >named.run 2>&1 &";
+ }
+
+ # get the shell to report the pid of the server ($!)
+ $command .= " echo \$!";
+
+ return $command;
+}
+
+sub start_ns_server {
+ my ( $server, $options ) = @_;
+
+ my $cleanup_files;
+ my $command;
+ my $pid_file;
+
+ $cleanup_files = "{./*.jnl,./*.bk,./*.st,./named.run}";
+
+ $command = construct_ns_command($server, $options);
+
+ $pid_file = "named.pid";
+
+ if ($clean) {
+ unlink glob $cleanup_files;
+ }
+
+ start_server($server, $command, $pid_file);
+}
+
+sub construct_ans_command {
+ my ( $server, $options ) = @_;
+
+ my $command;
+ my $n;
+
+ if ($server =~ /^ans(\d+)/) {
+ $n = $1;
+ } else {
+ die "unable to parse server number from name \"$server\"\n";
+ }
+
+ if (-e "$testdir/$server/ans.py") {
+ $command = "$PYTHON -u ans.py 10.53.0.$n $queryport";
+ } elsif (-e "$testdir/$server/ans.pl") {
+ $command = "$PERL ans.pl";
+ } else {
+ $command = "$PERL $topdir/ans.pl 10.53.0.$n";
+ }
+
+ if ($options) {
+ $command .= $options;
+ }
+
+ if ($restart) {
+ $command .= " >>ans.run 2>&1 &";
+ } else {
+ $command .= " >ans.run 2>&1 &";
+ }
+
+ # get the shell to report the pid of the server ($!)
+ $command .= " echo \$!";
+
+ return $command;
+}
+
+sub start_ans_server {
+ my ( $server, $options ) = @_;
+
+ my $cleanup_files;
+ my $command;
+ my $pid_file;
+
+ $cleanup_files = "{./ans.run}";
+ $command = construct_ans_command($server, $options);
+ $pid_file = "ans.pid";
+
+ if ($clean) {
+ unlink glob $cleanup_files;
+ }
+
+ start_server($server, $command, $pid_file);
+}
+
+sub count_running_lines {
+ my ( $server ) = @_;
+
+ my $runfile = "$testdir/$server/named.run";
+
+ # the shell *ought* to have created the file immediately, but this
+ # logic allows the creation to be delayed without issues
+ if (open(my $fh, "<", $runfile)) {
+ # the two non-whitespace blobs should be the date and time
+ # but we don't care about them really, only that they are there
+ return scalar(grep /^\S+ \S+ running\R/, <$fh>);
+ } else {
+ return 0;
+ }
+}
+
+sub verify_ns_server {
+ my ( $server, $instances_so_far ) = @_;
+
+ my $tries = 0;
+
+ while (count_running_lines($server) < $instances_so_far + 1) {
+ $tries++;
+
+ if ($tries >= 30) {
+ print "I:$test:server $server seems to have not started\n";
+ print "I:$test:failed\n";
+
+ system("$PERL $topdir/stop.pl $test");
+
+ exit 1;
+ }
+
+ sleep 2;
+ }
+
+ $tries = 0;
+
+ my $port = read_ns_port($server);
+ my $tcp = "+tcp";
+ my $n;
+
+ if ($server =~ /^ns(\d+)/) {
+ $n = $1;
+ } else {
+ die "unable to parse server number from name \"$server\"\n";
+ }
+
+ if (-e "$testdir/$server/named.notcp") {
+ $tcp = "";
+ }
+
+ my $ip = "10.53.0.$n";
+ if (-e "$testdir/$server/named.ipv6-only") {
+ $ip = "fd92:7065:b8e:ffff::$n";
+ }
+
+ while (1) {
+ my $return = system("$DIG $tcp +noadd +nosea +nostat +noquest +nocomm +nocmd +noedns -p $port version.bind. chaos txt \@$ip > /dev/null");
+
+ last if ($return == 0);
+
+ $tries++;
+
+ if ($tries >= 30) {
+ print "I:$test:no response from $server\n";
+ print "I:$test:failed\n";
+
+ system("$PERL $topdir/stop.pl $test");
+
+ exit 1;
+ }
+
+ sleep 2;
+ }
+}
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