On Tue, Oct 04, 2022 at 07:35:21AM -0700, Eugene Grebenschikov via nginx-devel wrote:
> # HG changeset patch
> # User Eugene Grebenschikov <e.grebenshchikov@f5.com>
> # Date 1664868942 25200
> # Tue Oct 04 00:35:42 2022 -0700
> # Node ID 238226015a212a0786cf720a214bc0eec60c122b
> # Parent c2c188c914880df9a04706482b809329aef29467
> Tests: http resolver with ipv4/ipv6 parameters.
>
> diff -r c2c188c91488 -r 238226015a21 http_resolver_ipv4.t
> --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> +++ b/http_resolver_ipv4.t Tue Oct 04 00:35:42 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, $state) = @_;
state isn't used, otherwise looks good
> +
> + my (@name, @rdata);
> +
> + use constant NOERROR => 0;
> +
> + use constant A => 1;
> + use constant AAAA => 28;
> +
> + use constant IN => 1;
> +
> + # default values
> +
> + my ($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);
> + }
> +}
> +
> +###############################################################################
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