Tests: add UDP rejection test for PROXY protocol v1.

t/stream_proxy_protocol_v2_udp_v1.t

@@ -0,0 +1,92 @@
+#!/usr/bin/perl
+
+# (C) Nginx, Inc.
+
+# Tests that PROXY protocol version 1 is rejected for UDP connections.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+use IO::Select;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+port(8080, udp => 1);
+port(8081, udp => 1);
+
+my $t = Test::Nginx->new()->has(qw/stream/)->plan(2)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+stream {
+    %%TEST_GLOBALS_STREAM%%
+
+    server {
+        listen          127.0.0.1:8080 udp;
+        proxy_pass      127.0.0.1:8081;
+        proxy_protocol  on;
+        # proxy_protocol_version defaults to 1
+    }
+}
+
+EOF
+
+$t->run_daemon(\&udp_daemon, port(8081));
+$t->run();
+
+###############################################################################
+
+my $s = IO::Socket::INET->new(
+	Proto    => 'udp',
+	PeerAddr => '127.0.0.1:' . port(8080),
+) or die "Can't create UDP socket: $!\n";
+
+$s->send('hello') or die "send: $!\n";
+
+my @ready = IO::Select->new($s)->can_read(2);
+is(scalar @ready, 0, 'udp v1 no response');
+
+$t->stop();
+
+like($t->read_file('error.log'),
+	qr/PROXY protocol version 1 is not supported for UDP/,
+	'udp v1 error logged');
+
+###############################################################################
+
+sub udp_daemon {
+	my ($port) = @_;
+
+	my $server = IO::Socket::INET->new(
+		Proto     => 'udp',
+		LocalAddr => "127.0.0.1:$port",
+		Reuse     => 1,
+	) or die "Can't create listening UDP socket: $!\n";
+
+	while (1) {
+		my $buf  = '';
+		my $peer = $server->recv($buf, 65536);
+		next unless defined $peer;
+		$server->send($buf, 0, $peer);
+	}
+}
+
+###############################################################################