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annotate http_resolver_cleanup.t @ 1101:78cb8e66b6bc

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Tests: skipped the whole http_resolver_cleanup.t where appropriate. While here, explained use-after-free issue in a bit more detail.
author Sergey Kandaurov <pluknet@nginx.com>
date Tue, 20 Dec 2016 12:56:54 +0300
parents bb1974010d0a
children e4974af3fb12
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bb1974010d0a Tests: resolver cleanup tests.
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1 #!/usr/bin/perl
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2
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3 # (C) Sergey Kandaurov
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4 # (C) Nginx, Inc.
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5
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6 # Tests for http resolver, worker process termination.
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7
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8 ###############################################################################
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9
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10 use warnings;
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11 use strict;
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12
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13 use Test::More;
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14
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15 BEGIN { use FindBin; chdir($FindBin::Bin); }
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16
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17 use lib 'lib';
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18 use Test::Nginx;
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19
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20 ###############################################################################
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21
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22 select STDERR; $| = 1;
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23 select STDOUT; $| = 1;
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24
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25 my $t = Test::Nginx->new()->has(qw/http proxy/);
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26
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27 plan(skip_all => 'win32') if $^O eq 'MSWin32';
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28 plan(skip_all => 'use-after-free on shutdown') unless $ENV{TEST_NGINX_UNSAFE}
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29 or $t->has_version('1.11.8');
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30
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31 $t->write_file_expand('nginx.conf', <<'EOF')->plan(1);
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32
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33 %%TEST_GLOBALS%%
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34
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35 daemon off;
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36
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37 events {
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38 }
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39
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40 http {
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41 %%TEST_GLOBALS_HTTP%%
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42
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43 server {
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44 listen 127.0.0.1:8080;
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45 server_name localhost;
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46
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47 location / {
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48 resolver 127.0.0.1:%%PORT_8081_UDP%%;
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49 proxy_pass http://example.net/$args;
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50 }
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51
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52 location /pid {
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53 add_header X-Pid $pid always;
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54 }
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55 }
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56 }
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57
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58 EOF
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59
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60 $t->run_daemon(\&dns_daemon, $t);
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61 $t->run()->waitforfile($t->testdir . '/' . port(8081));
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62
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63 ###############################################################################
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64
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65 # truncated UDP response, no response over TCP
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66
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67 my $s = http_get('/', start => 1);
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68
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69 pass('request');
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70
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71 sleep 1;
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72
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73 # retrasmission timer wasn't removed during resolver cleanup,
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74 # while the event memory was freed, resulting in use-after-free
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75 # when later removing timer in TCP connection
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76
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77 http_get('/pid') =~ qr/X-Pid: (\d+)/;
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78 kill 'TERM', $1;
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79
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80 ###############################################################################
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81
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82 sub dns_daemon {
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83 my ($t) = @_;
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84 my ($data);
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85
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86 my $socket = IO::Socket::INET->new(
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87 LocalAddr => '127.0.0.1',
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88 LocalPort => port(8081),
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89 Proto => 'udp',
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90 )
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91 or die "Can't create UDP socket: $!\n";
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92
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93 # signal we are ready
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94
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95 open my $fh, '>', $t->testdir() . '/' . port(8081);
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96 close $fh;
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97
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98 while (1) {
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99 $socket->recv($data, 65536);
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100 # truncation bit set
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101 $data |= pack("n2", 0, 0x8380);
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102 $socket->send($data);
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103 }
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104 }
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105
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106 ###############################################################################