http_resolver_cleanup.t

#!/usr/bin/perl

# (C) Sergey Kandaurov
# (C) Nginx, Inc.

# Tests for http resolver, worker process termination.

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use warnings;
use strict;

use Test::More;

BEGIN { use FindBin; chdir($FindBin::Bin); }

use lib 'lib';
use Test::Nginx;

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select STDERR; $| = 1;
select STDOUT; $| = 1;

my $t = Test::Nginx->new()->has(qw/http proxy/);

plan(skip_all => 'win32') if $^O eq 'MSWin32';

$t->write_file_expand('nginx.conf', <<'EOF')->plan(1);

%%TEST_GLOBALS%%

daemon off;

events {
}

http {
    %%TEST_GLOBALS_HTTP%%

    server {
        listen       127.0.0.1:8080;
        server_name  localhost;

        location / {
            resolver 127.0.0.1:%%PORT_8981_UDP%%;
            proxy_pass http://example.net/$args;
        }

        location /pid {
            add_header X-Pid $pid always;
        }
    }
}

EOF

$t->run_daemon(\&dns_daemon, $t);
$t->run()->waitforfile($t->testdir . '/' . port(8981));

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# truncated UDP response, no response over TCP

my $s = http_get('/', start => 1);

pass('request');

sleep 1;

# retrasmission timer wasn't removed during resolver cleanup,
# while the event memory was freed, resulting in use-after-free
# when later removing timer in TCP connection

http_get('/pid') =~ qr/X-Pid: (\d+)/;
kill 'TERM', $1;

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sub dns_daemon {
	my ($t) = @_;
	my ($data);

	my $socket = IO::Socket::INET->new(
		LocalAddr => '127.0.0.1',
		LocalPort => port(8981),
		Proto => 'udp',
	)
		or die "Can't create UDP socket: $!\n";

	# signal we are ready

	open my $fh, '>', $t->testdir() . '/' . port(8981);
	close $fh;

	while (1) {
		$socket->recv($data, 65536);
		# truncation bit set
		$data |= pack("n2", 0, 0x8380);
		$socket->send($data);
	}
}

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