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annotate http_resolver.t @ 362:8ca9c75c97d2

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Tests: more resolver tests. - Uncompressed answer section. - TTL handling in CNAME + A combined answer. - Case-insensitive lookups. - PTR type checking in RR for address to name resolving.
author Sergey Kandaurov <pluknet@nginx.com>
date Mon, 16 Dec 2013 18:59:16 +0400
parents cdab739eb6ea
children ec3284ebe53b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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;
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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
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69 location /backend {
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70 return 200;
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71 }
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72 location /50x {
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73 return 200 $upstream_addr;
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74 }
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75 }
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76 }
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77
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78 EOF
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79
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80 $t->run_daemon(\&dns_daemon, 8081, $t);
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81 $t->run_daemon(\&dns_daemon, 8082, $t);
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82
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83 $t->run()->plan(31);
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84
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85 $t->waitforfile($t->testdir . '/8081');
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86 $t->waitforfile($t->testdir . '/8082');
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87
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88 ###############################################################################
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89
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90 like(http_host_header('a.example.net', '/'), qr/200 OK/, 'A');
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91
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92 # ensure that resolver serves queries from cache in a case-insensitive manner
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93 # we check this by marking 2nd and subsequent queries on backend with SERVFAIL
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94
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95 TODO: {
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96 local $TODO = 'not yet' unless $t->has_version('1.5.8');
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97
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98 http_x_name_header('case.example.net', '/case');
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99 like(http_x_name_header('CASE.example.net', '/case'), qr/200 OK/,
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100 'A case-insensitive');
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101
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102 }
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103
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104 like(http_host_header('awide.example.net', '/'), qr/200 OK/, 'A uncompressed');
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105 like(http_host_header('short.example.net', '/'), qr/502 Bad/,
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106 'A short dns response');
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107
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108 like(http_host_header('nx.example.net', '/'), qr/502 Bad/, 'NXDOMAIN');
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109 like(http_host_header('cname.example.net', '/'), qr/200 OK/, 'CNAME');
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110 like(http_host_header('cname.example.net', '/'), qr/200 OK/,
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111 'CNAME cached');
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112
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113 # CNAME + A combined answer
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114 # demonstrates the name in answer section different from what is asked
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115
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116 like(http_host_header('cname_a.example.net', '/'), qr/200 OK/, 'CNAME + A');
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117
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118 # CNAME refers to non-existing A
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119
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120 like(http_host_header('cname2.example.net', '/'), qr/502 Bad/, 'CNAME bad');
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121 like(http_host_header('long.example.net', '/'), qr/200 OK/, 'long label');
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122 like(http_host_header('long2.example.net', '/'), qr/200 OK/, 'long name');
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123
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124 # take into account DNAME
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125
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126 like(http_host_header('alias.example.com', '/'), qr/200 OK/, 'DNAME');
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127
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128 # many A records in round robin
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129 # nonexisting IPs enumerated with proxy_next_upstream
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130
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131 like(http_host_header('many.example.net', '/'),
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132 qr/^127.0.0.20(1:8080, 127.0.0.202:8080|2:8080, 127.0.0.201:8080)$/m,
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133 'A many');
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134
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135 like(http_host_header('many.example.net', '/'),
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136 qr/^127.0.0.20(1:8080, 127.0.0.202:8080|2:8080, 127.0.0.201:8080)$/m,
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137 'A many cached');
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138
359
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139 # tests for several resolvers specified in directive
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140 # query bad ns, make sure that error responses are not cached
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141
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142 like(http_host_header('2.example.net', '/two'), qr/502 Bad/, 'two ns bad');
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143
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144 # now get correct response
352
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145
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146 like(http_host_header('2.example.net', '/two'), qr/200 OK/, 'two ns good');
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147
359
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148 # response is cached, actual request would get error
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149
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150 like(http_host_header('2.example.net', '/two'), qr/200 OK/, 'two ns cached');
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151
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152 # ttl tested with 1st req good and 2nd req bad
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153 # send 1st request and cache its good response
352
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154
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155 like(http_host_header('ttl.example.net', '/'), qr/200 OK/, 'ttl');
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156
359
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157 # response is cached, actual request would get error
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158
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159 like(http_host_header('ttl.example.net', '/'), qr/200 OK/, 'ttl cached 1');
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160 like(http_host_header('ttl.example.net', '/'), qr/200 OK/, 'ttl cached 2');
352
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161
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162 sleep 2;
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163
359
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164 # expired ttl causes nginx to make actual query
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165
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166 like(http_host_header('ttl.example.net', '/'), qr/502 Bad/, 'ttl expired');
352
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167
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168 # zero ttl prohibits response caching
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169
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170 like(http_host_header('ttl0.example.net', '/'), qr/200 OK/, 'zero ttl');
352
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171
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172 TODO: {
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173 local $TODO = 'support for zero ttl';
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174
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175 like(http_host_header('ttl0.example.net', '/'), qr/502 Bad/,
352
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176 'zero ttl not cached');
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177
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178 }
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179
359
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180 # "valid" parameter tested with 1st req good and 2nd req bad
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181 # send 1st request and cache its good response
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182
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183 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/, 'valid');
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184
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185 # response is cached, actual request would get error
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186
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187 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/,
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188 'valid cached 1');
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189 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/,
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190 'valid cached 2');
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191
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192 sleep 2;
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193
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194 # expired ttl is overridden with "valid" parameter
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195 # response is taken from cache
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196
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197 like(http_host_header('ttl.example.net', '/valid'), qr/200 OK/,
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198 'valid overrides ttl');
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199
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200 sleep 2;
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201
359
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202 # expired "valid" value causes nginx to make actual query
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203
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204 like(http_host_header('ttl.example.net', '/valid'), qr/502 Bad/,
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205 'valid expired');
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206
362
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207 TODO: {
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208 local $TODO = 'not yet';
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209
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210 # Ensure that resolver respects expired A in CNAME + A combined response.
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211 # When ttl in A is expired, only the canonical name should be queried.
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212 # Catch this by returning SERVFAIL on the 2nd and subsequent queries for
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213 # original name.
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214
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215 http_host_header('cname_a_ttl.example.net', '/');
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216
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217 # Ensure that resolver respects expired CNAME in CNAME + A combined response.
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218 # When ttl in CNAME is expired, the answer should not be served from cache.
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219 # Catch this by returning SERVFAIL on the 2nd and subsequent queries.
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220
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221 http_host_header('cname_a_ttl2.example.net', '/');
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222
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223 sleep 2;
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224
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225 like(http_host_header('cname_a_ttl.example.net', '/'), qr/200 OK/,
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226 'CNAME + A with expired A ttl');
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227 like(http_host_header('cname_a_ttl2.example.net', '/'), qr/502 Bad/,
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228 'CNAME + A with expired CNAME ttl');
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229
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230 }
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231
352
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232 like(http_host_header('example.net', '/invalid'), qr/502 Bad/, 'no resolver');
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233
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234 ###############################################################################
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235
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236 sub http_host_header {
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237 my ($host, $uri) = @_;
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238 return http(<<EOF);
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239 GET $uri HTTP/1.0
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240 Host: $host
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241
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242 EOF
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243 }
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244
362
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245 sub http_x_name_header {
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246 my ($host, $uri) = @_;
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247 return http(<<EOF);
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248 GET $uri HTTP/1.0
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249 X-Name: $host
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250
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251 EOF
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252 }
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253
352
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254 ###############################################################################
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255
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256 sub reply_handler {
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257 my ($recv_data, $port, $state) = @_;
357
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258
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259 my (@name, @rdata);
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260
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261 use constant NOERROR => 0;
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262 use constant SERVFAIL => 2;
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263 use constant NXDOMAIN => 3;
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264
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265 use constant A => 1;
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266 use constant CNAME => 5;
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267 use constant DNAME => 39;
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268
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269 use constant IN => 1;
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270
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271 # default values
352
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272
357
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273 my ($hdr, $rcode, $ttl) = (0x8180, NOERROR, 3600);
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274
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275 # decode name
352
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276
357
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277 my ($len, $offset) = (undef, 12);
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diff changeset
278 while (1) {
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diff changeset
279 $len = unpack("\@$offset C", $recv_data);
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diff changeset
280 last if $len == 0;
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diff changeset
281 $offset++;
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diff changeset
282 push @name, unpack("\@$offset A$len", $recv_data);
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diff changeset
283 $offset += $len;
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284 }
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diff changeset
285
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diff changeset
286 $offset -= 1;
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diff changeset
287 my ($id, $type, $class) = unpack("n x$offset n2", $recv_data);
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diff changeset
288
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diff changeset
289 my $name = join('.', @name);
352
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290 if (($name eq 'a.example.net') || ($name eq 'alias.example.net')) {
359
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diff changeset
291 if ($type == A || $type == CNAME) {
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diff changeset
292 push @rdata, rd_addr($ttl, '127.0.0.1');
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diff changeset
293 }
352
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294
362
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diff changeset
295 } elsif ($name eq 'case.example.net' && $type == A) {
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diff changeset
296 if (++$state->{casecnt} > 1) {
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diff changeset
297 $rcode = SERVFAIL;
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298 }
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diff changeset
299
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diff changeset
300 push @rdata, rd_addr($ttl, '127.0.0.1');
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diff changeset
301
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diff changeset
302 } elsif ($name eq 'awide.example.net' && $type == A) {
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diff changeset
303 push @rdata, pack '(w/a*)3x n2N nC4',
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diff changeset
304 ('awide', 'example', 'net'), A, IN, $ttl,
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diff changeset
305 4, (127, 0, 0, 1);
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diff changeset
306
359
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diff changeset
307 } elsif (($name eq 'many.example.net') && $type == A) {
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diff changeset
308 $state->{manycnt}++;
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diff changeset
309 if ($state->{manycnt} > 1) {
357
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diff changeset
310 $rcode = SERVFAIL;
352
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311 }
357
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diff changeset
312
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diff changeset
313 push @rdata, rd_addr($ttl, '127.0.0.201');
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diff changeset
314 push @rdata, rd_addr($ttl, '127.0.0.202');
352
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diff changeset
315
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
316
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317 } elsif (($name eq 'short.example.net')) {
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318 # zero length RDATA in DNS response
357
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diff changeset
319
359
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diff changeset
320 if ($type == A) {
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diff changeset
321 push @rdata, rd_addr($ttl, '');
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diff changeset
322 }
352
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diff changeset
323
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diff changeset
324 } elsif (($name eq 'alias.example.com')) {
357
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diff changeset
325 # example.com. 3600 IN DNAME example.net.
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diff changeset
326
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diff changeset
327 my @dname = ('example', 'net');
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diff changeset
328 my $rdlen = length(join '', @dname) + @dname + 1;
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diff changeset
329 push @rdata, pack("n3N n(w/a*)* x", 0xc012, DNAME, IN, $ttl,
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diff changeset
330 $rdlen, @dname);
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diff changeset
331
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diff changeset
332 # alias.example.com. 3600 IN CNAME alias.example.net.
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diff changeset
333
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diff changeset
334 push @rdata, pack("n3N nCa5n", 0xc00c, CNAME, IN, $ttl,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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diff changeset
335 8, 5, 'alias', 0xc02f);
352
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diff changeset
336
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diff changeset
337 } elsif ($name eq 'cname.example.net') {
359
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diff changeset
338 $state->{cnamecnt}++;
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diff changeset
339 if ($state->{cnamecnt} > 2) {
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diff changeset
340 $rcode = SERVFAIL;
352
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diff changeset
341 }
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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diff changeset
342 push @rdata, pack("n3N nCa5n", 0xc00c, CNAME, IN, $ttl,
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diff changeset
343 8, 5, 'alias', 0xc012);
352
145c37f27c5a Tests: added resolver tests.
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diff changeset
344
356
7a472e46772c Tests: added http resolver test for CNAME + A combined answer.
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diff changeset
345 } elsif ($name eq 'cname_a.example.net') {
357
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diff changeset
346 push @rdata, pack("n3N nCa5n", 0xc00c, CNAME, IN, $ttl,
e0c00e695cb5 Tests: removed Net::DNS dependency.
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diff changeset
347 8, 5, 'alias', 0xc014);
356
7a472e46772c Tests: added http resolver test for CNAME + A combined answer.
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diff changeset
348
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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diff changeset
349 # points to "alias" set in previous rdata
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diff changeset
350
359
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diff changeset
351 if ($type == A) {
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diff changeset
352 push @rdata, pack('n3N nC4', 0xc031, A, IN, $ttl,
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
353 4, split(/\./, '127.0.0.1'));
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
354 }
356
7a472e46772c Tests: added http resolver test for CNAME + A combined answer.
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parents: 352
diff changeset
355
362
8ca9c75c97d2 Tests: more resolver tests.
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diff changeset
356 } elsif ($name eq 'cname_a_ttl.example.net') {
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
357 push @rdata, pack("n3N nCa17n", 0xc00c, CNAME, IN, $ttl,
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
358 20, 17, 'cname_a_ttl_alias', 0xc018);
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
359
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
360 if ($type == A) {
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
361 if (++$state->{cttlcnt} >= 2) {
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
362 $rcode = SERVFAIL;
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
363 }
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
364 push @rdata, pack('n3N nC4', 0xc035, A, IN, 1,
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
365 4, split(/\./, '127.0.0.1'));
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
366 }
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
367
8ca9c75c97d2 Tests: more resolver tests.
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parents: 359
diff changeset
368 } elsif ($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 $state->{ttlcnt}++;
cdab739eb6ea Tests: resolver tests enabled to work with AAAA capable resolver.
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parents: 357
diff changeset
404 if ($state->{ttlcnt} == 2 || $state->{ttlcnt} == 4) {
357
e0c00e695cb5 Tests: removed Net::DNS dependency.
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parents: 356
diff changeset
405 $rcode = SERVFAIL;
352
145c37f27c5a Tests: added resolver tests.
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parents:
diff changeset
406 }
357
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407
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408 push @rdata, rd_addr(1, '127.0.0.1');
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409
359
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410 } elsif ($name eq 'ttl0.example.net' && $type == A) {
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411 $state->{ttl0cnt}++;
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412 if ($state->{ttl0cnt} == 2) {
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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) {
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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 $rcode = SERVFAIL;
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424 }
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425
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426 if ($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 {
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447 my ($port, $t) = @_;
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448
357
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449 my ($data, $recv_data);
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450 my $socket = IO::Socket::INET->new(
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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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464 cttlcnt => 0,
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465 cttl2cnt => 0,
359
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466 manycnt => 0,
362
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467 casecnt => 0,
359
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468 );
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469
357
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470 # signal we are ready
352
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471
357
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472 open my $fh, '>', $t->testdir() . '/' . $port;
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473 close $fh;
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474
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475 while (1) {
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476 $socket->recv($recv_data, 65536);
359
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477 $data = reply_handler($recv_data, $port, \%state);
357
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478 $socket->send($data);
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479 }
352
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480 }
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481
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482 ###############################################################################