[PATCH] Tests: http resolver with ipv4/ipv6 parameters

[Eugene Grebenschikov]

# HG changeset patch
# User Eugene Grebenschikov <e.grebenshchikov at f5.com>
# Date 1665038181 25200
#      Wed Oct 05 23:36:21 2022 -0700
# Node ID 595dee133b0a3681e95567368191c559ad89b3a1
# Parent  fac6ad94e062ee30356338c943843c4b34d5f532
Tests: http resolver with ipv4/ipv6 parameters.

diff -r fac6ad94e062 -r 595dee133b0a http_resolver_ipv4.t
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/http_resolver_ipv4.t	Wed Oct 05 23:36:21 2022 -0700
@@ -0,0 +1,208 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Eugene Grebenschikov
+# (C) Nginx, Inc.
+
+# Tests for http resolver with ipv4/ipv6 parameters.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http proxy rewrite/);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location / {
+            proxy_pass  http://$arg_h:%%PORT_8081%%/;
+            resolver  127.0.0.1:%%PORT_8980_UDP%% ipv4=on ipv6=on;
+        }
+
+        location /ipv4 {
+            proxy_pass  http://$arg_h:%%PORT_8081%%/;
+            resolver  127.0.0.1:%%PORT_8980_UDP%% ipv4=on ipv6=off;
+        }
+
+        location /ipv6 {
+            proxy_pass  http://$arg_h:%%PORT_8081%%/;
+            resolver  127.0.0.1:%%PORT_8980_UDP%% ipv4=off ipv6=on;
+        }
+    }
+
+    server {
+        listen       127.0.0.1:8081;
+        server_name  localhost;
+
+        location / {
+            return  200 "ipv4";
+        }
+    }
+
+    server {
+        listen       [::1]:%%PORT_8081%%;
+        server_name  localhost;
+
+        location / {
+            return  200 "ipv6";
+        }
+    }
+}
+
+EOF
+
+$t->try_run('no resolver ipv4')->plan(3);
+
+$t->run_daemon(\&dns_daemon, port(8980), $t);
+$t->waitforfile($t->testdir . '/' . port(8980));
+
+###############################################################################
+
+like(many('/', 10), qr/ipv4: \d+, ipv6: \d+/, 'ipv4 ipv6');
+is(many('/ipv4', 10), 'ipv4: 10', 'ipv4 only');
+is(many('/ipv6', 10), 'ipv6: 10', 'ipv6 only');
+
+###############################################################################
+
+sub many {
+	my ($uri, $count) = @_;
+	my %hits;
+
+	for (1 .. $count) {
+		if (http_get("$uri?h=example.com") =~ /(ipv(4|6))/) {;
+			$hits{$1} = 0 unless defined $hits{$1};
+			$hits{$1}++;
+		}
+	}
+
+	return join ', ', map { $_ . ": " . $hits{$_} } sort keys %hits;
+}
+
+###############################################################################
+
+sub reply_handler {
+	my ($recv_data, $port) = @_;
+
+	my (@name, @rdata);
+
+	use constant NOERROR	=> 0;
+
+	use constant A		=> 1;
+	use constant AAAA	=> 28;
+
+	use constant IN		=> 1;
+
+	# default values
+
+	my ($hdr, $rcode, $ttl) = (0x8180, NOERROR, 3600);
+
+	# decode name
+
+	my ($len, $offset) = (undef, 12);
+	while (1) {
+		$len = unpack("\@$offset C", $recv_data);
+		last if $len == 0;
+		$offset++;
+		push @name, unpack("\@$offset A$len", $recv_data);
+		$offset += $len;
+	}
+
+	$offset -= 1;
+	my ($id, $type, $class) = unpack("n x$offset n2", $recv_data);
+
+	my $name = join('.', @name);
+	if ($name eq 'example.com') {
+		if ($type == A) {
+			push @rdata, rd_addr($ttl, '127.0.0.1');
+		}
+		if ($type == AAAA) {
+			push @rdata, rd_addr6($ttl, "::1");
+		}
+	}
+
+	$len = @name;
+	pack("n6 (C/a*)$len x n2", $id, $hdr | $rcode, 1, scalar @rdata,
+		0, 0, @name, $type, $class) . join('', @rdata);
+}
+
+sub rd_addr {
+	my ($ttl, $addr) = @_;
+
+	my $code = 'split(/\./, $addr)';
+
+	pack 'n3N nC4', 0xc00c, A, IN, $ttl, eval "scalar $code", eval($code);
+}
+
+sub expand_ip6 {
+	my ($addr) = @_;
+
+	substr ($addr, index($addr, "::"), 2) =
+		join "0", map { ":" } (0 .. 8 - (split /:/, $addr) + 1);
+	map { hex "0" x (4 - length $_) . "$_" } split /:/, $addr;
+}
+
+sub rd_addr6 {
+	my ($ttl, $addr) = @_;
+
+	pack 'n3N nn8', 0xc00c, AAAA, IN, $ttl, 16, expand_ip6($addr);
+}
+
+sub dns_daemon {
+	my ($port, $t) = @_;
+
+	my ($data, $recv_data);
+	my $socket = IO::Socket::INET->new(
+		LocalAddr => '127.0.0.1',
+		LocalPort => $port,
+		Proto => 'udp',
+	)
+		or die "Can't create listening socket: $!\n";
+
+	# track number of relevant queries
+
+	my %state = (
+		cnamecnt	=> 0,
+		twocnt		=> 0,
+		manycnt		=> 0,
+	);
+
+	# signal we are ready
+
+	open my $fh, '>', $t->testdir() . '/' . $port;
+	close $fh;
+
+	while (1) {
+		$socket->recv($recv_data, 65536);
+		$data = reply_handler($recv_data, $port, \%state);
+		$socket->send($data);
+	}
+}
+
+###############################################################################