annotate http_resolver.t @ 570:f7bc1f74970a

Tests: avoid send errors in syslog tests with mail error_log. Use a separate mail server block for syslog parsing tests to make sure that syslog messages are always read by the receiver on the remote side. Otherwise, syslog message might not be sent due to a pending socket error.
author Sergey Kandaurov <pluknet@nginx.com>
date Thu, 07 May 2015 14:28:44 +0300
parents a04b8b9537cd
children 99233cfefbbe
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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.
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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 qw/ :DEFAULT http_end /;
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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 rewrite/);
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26
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27 $t->write_file_expand('nginx.conf', <<'EOF');
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28
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29 %%TEST_GLOBALS%%
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30
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31 daemon off;
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32
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33 events {
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34 }
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35
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36 http {
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37 %%TEST_GLOBALS_HTTP%%
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38
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39 server {
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40 listen 127.0.0.1:8080;
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41 server_name localhost;
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42
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43 location / {
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44 resolver 127.0.0.1:8081;
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45 resolver_timeout 1s;
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46 proxy_pass http://$host:8080/backend;
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47
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48 proxy_next_upstream http_504 timeout error;
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49 proxy_intercept_errors on;
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50 proxy_connect_timeout 1s;
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51 error_page 504 502 /50x;
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52 }
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53 location /two {
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54 resolver 127.0.0.1:8081 127.0.0.1:8082;
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55 proxy_pass http://$host:8080/backend;
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56 }
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57 location /valid {
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58 resolver 127.0.0.1:8081 valid=3s;
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59 proxy_pass http://$host:8080/backend;
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60 }
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61 location /case {
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62 resolver 127.0.0.1:8081;
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63 proxy_pass http://$http_x_name:8080/backend;
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64 }
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65 location /invalid {
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66 proxy_pass http://$host:8080/backend;
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67 }
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68 location /resend {
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69 resolver 127.0.0.1:8081;
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70 resolver_timeout 8s;
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71 proxy_pass http://$host:8080/backend;
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72 }
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73 location /bad {
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74 resolver 127.0.0.1:8089;
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75 resolver_timeout 1s;
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76 proxy_pass http://$host:8080/backend;
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77 }
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78
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79 location /backend {
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80 return 200;
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81 }
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82 location /50x {
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83 return 200 $upstream_addr;
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84 }
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85 }
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86 }
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87
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88 EOF
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89
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90 $t->run_daemon(\&dns_daemon, 8081, $t);
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91 $t->run_daemon(\&dns_daemon, 8082, $t);
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92 $t->run_daemon(\&dns_daemon, 8089, $t);
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93
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94 $t->run()->plan(32);
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95
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96 $t->waitforfile($t->testdir . '/8081');
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97 $t->waitforfile($t->testdir . '/8082');
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98 $t->waitforfile($t->testdir . '/8089');
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99
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100 ###############################################################################
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101
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102 # schedule resend test, which takes about 5 seconds to complete
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103
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104 my $s = http_host_header('id.example.net', '/resend', start => 1);
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105
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106 like(http_host_header('a.example.net', '/'), qr/200 OK/, 'A');
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107
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108 # ensure that resolver serves queries from cache in a case-insensitive manner
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109 # we check this by marking 2nd and subsequent queries on backend with SERVFAIL
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110
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111 http_x_name_header('case.example.net', '/case');
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112 like(http_x_name_header('CASE.example.net', '/case'), qr/200 OK/,
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113 'A case-insensitive');
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114
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115 like(http_host_header('awide.example.net', '/'), qr/200 OK/, 'A uncompressed');
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116 like(http_host_header('short.example.net', '/'), qr/502 Bad/,
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117 'A short dns response');
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118
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119 like(http_host_header('nx.example.net', '/'), qr/502 Bad/, 'NXDOMAIN');
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120 like(http_host_header('cname.example.net', '/'), qr/200 OK/, 'CNAME');
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121 like(http_host_header('cname.example.net', '/'), qr/200 OK/,
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122 'CNAME cached');
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123
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124 # CNAME + A combined answer
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125 # demonstrates the name in answer section different from what is asked
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126
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127 like(http_host_header('cname_a.example.net', '/'), qr/200 OK/, 'CNAME + A');
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128
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129 # CNAME refers to non-existing A
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130
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131 like(http_host_header('cname2.example.net', '/'), qr/502 Bad/, 'CNAME bad');
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132 like(http_host_header('long.example.net', '/'), qr/200 OK/, 'long label');
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133 like(http_host_header('long2.example.net', '/'), qr/200 OK/, 'long name');
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134
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135 # take into account DNAME
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136
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137 like(http_host_header('alias.example.com', '/'), qr/200 OK/, 'DNAME');
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138
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139 # many A records in round robin
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140 # nonexisting IPs enumerated with proxy_next_upstream
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141
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142 like(http_host_header('many.example.net', '/'),
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143 qr/^127.0.0.20(1:8080, 127.0.0.202:8080|2:8080, 127.0.0.201:8080)$/m,
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144 'A many');
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145
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146 like(http_host_header('many.example.net', '/'),
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147 qr/^127.0.0.20(1:8080, 127.0.0.202:8080|2:8080, 127.0.0.201:8080)$/m,
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148 'A many cached');
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149
359
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150 # tests for several resolvers specified in directive
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151 # query bad ns, make sure that error responses are not cached
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152
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153 like(http_host_header('2.example.net', '/two'), qr/502 Bad/, 'two ns bad');
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154
359
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155 # now get correct response
352
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156
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157 like(http_host_header('2.example.net', '/two'), qr/200 OK/, 'two ns good');
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158
359
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159 # response is cached, actual request would get error
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160
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161 like(http_host_header('2.example.net', '/two'), qr/200 OK/, 'two ns cached');
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162
359
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163 # ttl tested with 1st req good and 2nd req bad
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164 # send 1st request and cache its good response
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165
359
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166 like(http_host_header('ttl.example.net', '/'), qr/200 OK/, 'ttl');
352
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167
359
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168 # response is cached, actual request would get error
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169
359
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170 like(http_host_header('ttl.example.net', '/'), qr/200 OK/, 'ttl cached 1');
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171 like(http_host_header('ttl.example.net', '/'), qr/200 OK/, 'ttl cached 2');
352
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172
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173 sleep 2;
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174
359
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175 # expired ttl causes nginx to make actual query
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176
359
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177 like(http_host_header('ttl.example.net', '/'), qr/502 Bad/, 'ttl expired');
352
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178
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179 # zero ttl prohibits response caching
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180
359
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181 like(http_host_header('ttl0.example.net', '/'), qr/200 OK/, 'zero ttl');
352
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182
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183 TODO: {
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184 local $TODO = 'support for zero ttl';
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185
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186 like(http_host_header('ttl0.example.net', '/'), qr/502 Bad/,
352
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187 'zero ttl not cached');
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188
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189 }
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190
359
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191 # "valid" parameter tested with 1st req good and 2nd req bad
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192 # send 1st request and cache its good response
352
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193
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194 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/, 'valid');
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195
359
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196 # response is cached, actual request would get error
352
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197
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198 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/,
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199 'valid cached 1');
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200 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/,
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201 'valid cached 2');
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202
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203 sleep 2;
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204
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205 # expired ttl is overridden with "valid" parameter
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206 # response is taken from cache
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207
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208 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/,
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209 'valid overrides ttl');
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210
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211 sleep 2;
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212
359
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213 # expired "valid" value causes nginx to make actual query
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214
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215 like(http_host_header('ttl.example.net', '/valid'), qr/502 Bad/,
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216 'valid expired');
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217
362
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218 # Ensure that resolver respects expired CNAME in CNAME + A combined response.
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219 # When ttl in CNAME is expired, the answer should not be served from cache.
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220 # Catch this by returning SERVFAIL on the 2nd and subsequent queries.
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221
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222 http_host_header('cname_a_ttl2.example.net', '/');
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223
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224 sleep 2;
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225
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226 like(http_host_header('cname_a_ttl2.example.net', '/'), qr/502 Bad/,
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227 'CNAME + A with expired CNAME ttl');
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228
352
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229 like(http_host_header('example.net', '/invalid'), qr/502 Bad/, 'no resolver');
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230
436
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231 like(http_end($s), qr/200 OK/, 'resend after malformed response');
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232
449
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233 $s = http_get('/bad', start => 1);
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234 my $s2 = http_get('/bad', start => 1);
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235
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236 http_end($s);
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237 ok(http_end($s2), 'timeout handler on 2nd request');
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238
352
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239 ###############################################################################
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240
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241 sub http_host_header {
438
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242 my ($host, $uri, %extra) = @_;
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243 return http(<<EOF, %extra);
352
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244 GET $uri HTTP/1.0
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245 Host: $host
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246
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247 EOF
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248 }
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249
362
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250 sub http_x_name_header {
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251 my ($host, $uri) = @_;
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252 return http(<<EOF);
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253 GET $uri HTTP/1.0
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254 X-Name: $host
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255
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256 EOF
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257 }
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258
352
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259 ###############################################################################
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260
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261 sub reply_handler {
359
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262 my ($recv_data, $port, $state) = @_;
357
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263
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264 my (@name, @rdata);
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265
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266 use constant NOERROR => 0;
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267 use constant SERVFAIL => 2;
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268 use constant NXDOMAIN => 3;
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269
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270 use constant A => 1;
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271 use constant CNAME => 5;
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272 use constant DNAME => 39;
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273
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274 use constant IN => 1;
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diff changeset
275
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diff changeset
276 # default values
352
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277
357
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diff changeset
278 my ($hdr, $rcode, $ttl) = (0x8180, NOERROR, 3600);
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diff changeset
279
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diff changeset
280 # decode name
352
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281
357
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diff changeset
282 my ($len, $offset) = (undef, 12);
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diff changeset
283 while (1) {
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diff changeset
284 $len = unpack("\@$offset C", $recv_data);
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diff changeset
285 last if $len == 0;
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diff changeset
286 $offset++;
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diff changeset
287 push @name, unpack("\@$offset A$len", $recv_data);
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diff changeset
288 $offset += $len;
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289 }
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diff changeset
290
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diff changeset
291 $offset -= 1;
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diff changeset
292 my ($id, $type, $class) = unpack("n x$offset n2", $recv_data);
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diff changeset
293
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diff changeset
294 my $name = join('.', @name);
352
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295 if (($name eq 'a.example.net') || ($name eq 'alias.example.net')) {
359
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diff changeset
296 if ($type == A || $type == CNAME) {
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diff changeset
297 push @rdata, rd_addr($ttl, '127.0.0.1');
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298 }
352
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299
362
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300 } elsif ($name eq 'case.example.net' && $type == A) {
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diff changeset
301 if (++$state->{casecnt} > 1) {
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302 $rcode = SERVFAIL;
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303 }
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diff changeset
304
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diff changeset
305 push @rdata, rd_addr($ttl, '127.0.0.1');
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diff changeset
306
436
4984dac109db Tests: added test for resolver resend.
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diff changeset
307 } elsif ($name eq 'id.example.net' && $type == A) {
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diff changeset
308 if (++$state->{idcnt} == 1) {
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diff changeset
309 $id++;
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diff changeset
310 }
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diff changeset
311
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diff changeset
312 push @rdata, rd_addr($ttl, '127.0.0.1');
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diff changeset
313
362
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diff changeset
314 } elsif ($name eq 'awide.example.net' && $type == A) {
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diff changeset
315 push @rdata, pack '(w/a*)3x n2N nC4',
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diff changeset
316 ('awide', 'example', 'net'), A, IN, $ttl,
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diff changeset
317 4, (127, 0, 0, 1);
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diff changeset
318
359
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diff changeset
319 } elsif (($name eq 'many.example.net') && $type == A) {
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diff changeset
320 $state->{manycnt}++;
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diff changeset
321 if ($state->{manycnt} > 1) {
357
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diff changeset
322 $rcode = SERVFAIL;
352
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323 }
357
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diff changeset
324
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diff changeset
325 push @rdata, rd_addr($ttl, '127.0.0.201');
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diff changeset
326 push @rdata, rd_addr($ttl, '127.0.0.202');
352
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parents:
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327
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parents:
diff changeset
328
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diff changeset
329 } elsif (($name eq 'short.example.net')) {
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diff changeset
330 # zero length RDATA in DNS response
357
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diff changeset
331
359
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diff changeset
332 if ($type == A) {
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diff changeset
333 push @rdata, rd_addr($ttl, '');
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diff changeset
334 }
352
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diff changeset
335
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diff changeset
336 } elsif (($name eq 'alias.example.com')) {
357
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diff changeset
337 # example.com. 3600 IN DNAME example.net.
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diff changeset
338
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diff changeset
339 my @dname = ('example', 'net');
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diff changeset
340 my $rdlen = length(join '', @dname) + @dname + 1;
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diff changeset
341 push @rdata, pack("n3N n(w/a*)* x", 0xc012, DNAME, IN, $ttl,
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diff changeset
342 $rdlen, @dname);
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diff changeset
343
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diff changeset
344 # alias.example.com. 3600 IN CNAME alias.example.net.
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diff changeset
345
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diff changeset
346 push @rdata, pack("n3N nCa5n", 0xc00c, CNAME, IN, $ttl,
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diff changeset
347 8, 5, 'alias', 0xc02f);
352
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diff changeset
348
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diff changeset
349 } elsif ($name eq 'cname.example.net') {
359
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diff changeset
350 $state->{cnamecnt}++;
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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diff changeset
351 if ($state->{cnamecnt} > 2) {
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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diff changeset
352 $rcode = SERVFAIL;
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
353 }
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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diff changeset
354 push @rdata, pack("n3N nCa5n", 0xc00c, CNAME, IN, $ttl,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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diff changeset
355 8, 5, 'alias', 0xc012);
352
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parents:
diff changeset
356
356
7a472e46772c Tests: added http resolver test for CNAME + A combined answer.
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diff changeset
357 } elsif ($name eq 'cname_a.example.net') {
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
358 push @rdata, pack("n3N nCa5n", 0xc00c, CNAME, IN, $ttl,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
359 8, 5, 'alias', 0xc014);
356
7a472e46772c Tests: added http resolver test for CNAME + A combined answer.
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parents: 352
diff changeset
360
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
361 # points to "alias" set in previous rdata
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diff changeset
362
359
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
363 if ($type == A) {
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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diff changeset
364 push @rdata, pack('n3N nC4', 0xc031, A, IN, $ttl,
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
365 4, split(/\./, '127.0.0.1'));
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
366 }
356
7a472e46772c Tests: added http resolver test for CNAME + A combined answer.
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parents: 352
diff changeset
367
362
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
368 } elsif ($name eq 'cname_a_ttl2.example.net' && $type == A) {
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
369 push @rdata, pack("n3N nCa18n", 0xc00c, CNAME, IN, 1,
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
370 21, 18, 'cname_a_ttl2_alias', 0xc019);
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
371 if (++$state->{cttl2cnt} >= 2) {
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
372 $rcode = SERVFAIL;
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
373 }
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
374 push @rdata, pack('n3N nC4', 0xc036, A, IN, $ttl,
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
375 4, split(/\./, '127.0.0.1'));
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
376
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
377 } elsif ($name eq 'cname_a_ttl_alias.example.net' && $type == A) {
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
378 push @rdata, rd_addr($ttl, '127.0.0.1');
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
379
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
380 } elsif ($name eq 'cname2.example.net') {
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
381 # points to non-existing A
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
382
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
383 push @rdata, pack("n3N nCa2n", 0xc00c, CNAME, IN, $ttl,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
384 5, 2, 'nx', 0xc02f);
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
385
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
386 } elsif ($name eq 'long.example.net') {
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
387 push @rdata, pack("n3N nCA63x", 0xc00c, CNAME, IN, $ttl,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
388 65, 63, 'a' x 63);
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
389
359
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
390 } elsif (($name eq 'a' x 63) && $type == A) {
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
391 push @rdata, rd_addr($ttl, '127.0.0.1');
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
392
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
393 } elsif ($name eq 'long2.example.net') {
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
394 push @rdata, pack("n3N n(CA63)4x", 0xc00c, CNAME, IN, $ttl, 257,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
395 63, 'a' x 63, 63, 'a' x 63, 63, 'a' x 63, 63, 'a' x 63);
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
396
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
397 } elsif (($name eq 'a' x 63 . '.' . 'a' x 63 . '.' . 'a' x 63 . '.'
359
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
398 . 'a' x 63) && $type == A)
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
399 {
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
400 push @rdata, rd_addr($ttl, '127.0.0.1');
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
401
359
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
402 } elsif ($name eq 'ttl.example.net' && $type == A) {
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
403 $state->{ttlcnt}++;
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404 if ($state->{ttlcnt} == 2 || $state->{ttlcnt} == 4) {
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405 $rcode = SERVFAIL;
352
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406 }
357
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407
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408 push @rdata, rd_addr(1, '127.0.0.1');
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409
359
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410 } elsif ($name eq 'ttl0.example.net' && $type == A) {
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411 $state->{ttl0cnt}++;
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412 if ($state->{ttl0cnt} == 2) {
357
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413 $rcode = SERVFAIL;
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414 }
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415
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416 push @rdata, rd_addr(0, '127.0.0.1');
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417
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418 } elsif ($name eq '2.example.net') {
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419 if ($port == 8081) {
359
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420 $state->{twocnt}++;
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421 }
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422 if ($state->{twocnt} & 1) {
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423 $rcode = SERVFAIL;
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424 }
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425
359
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426 if ($type == A) {
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427 push @rdata, rd_addr($ttl, '127.0.0.1');
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428 }
352
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429 }
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430
357
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431 $len = @name;
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432 pack("n6 (w/a*)$len x n2", $id, $hdr | $rcode, 1, scalar @rdata,
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433 0, 0, @name, $type, $class) . join('', @rdata);
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434 }
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435
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436 sub rd_addr {
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437 my ($ttl, $addr) = @_;
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438
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439 my $code = 'split(/\./, $addr)';
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440
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441 return pack 'n3N', 0xc00c, A, IN, $ttl if $addr eq '';
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442
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443 pack 'n3N nC4', 0xc00c, A, IN, $ttl, eval "scalar $code", eval($code);
352
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444 }
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445
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446 sub dns_daemon {
357
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447 my ($port, $t) = @_;
352
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448
357
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449 my ($data, $recv_data);
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450 my $socket = IO::Socket::INET->new(
352
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451 LocalAddr => '127.0.0.1',
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452 LocalPort => $port,
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453 Proto => 'udp',
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454 )
357
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455 or die "Can't create listening socket: $!\n";
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456
359
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457 # track number of relevant queries
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458
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459 my %state = (
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460 cnamecnt => 0,
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461 twocnt => 0,
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462 ttlcnt => 0,
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463 ttl0cnt => 0,
362
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diff changeset
464 cttlcnt => 0,
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465 cttl2cnt => 0,
359
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diff changeset
466 manycnt => 0,
362
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diff changeset
467 casecnt => 0,
436
4984dac109db Tests: added test for resolver resend.
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diff changeset
468 idcnt => 0,
359
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diff changeset
469 );
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diff changeset
470
357
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diff changeset
471 # signal we are ready
352
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472
357
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diff changeset
473 open my $fh, '>', $t->testdir() . '/' . $port;
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diff changeset
474 close $fh;
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diff changeset
475
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diff changeset
476 while (1) {
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diff changeset
477 $socket->recv($recv_data, 65536);
464
5ec2caad00e8 Tests: fixed resolver timeout test.
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diff changeset
478 next if $port == 8089;
359
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diff changeset
479 $data = reply_handler($recv_data, $port, \%state);
357
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diff changeset
480 $socket->send($data);
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diff changeset
481 }
352
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diff changeset
482 }
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
483
145c37f27c5a Tests: added resolver tests.
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diff changeset
484 ###############################################################################