1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent::MP::Transport - actual transport protocol |
3 | AnyEvent::MP::Transport - actual transport protocol handler |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use AnyEvent::MP::Transport; |
7 | use AnyEvent::MP::Transport; |
8 | |
8 | |
9 | =head1 DESCRIPTION |
9 | =head1 DESCRIPTION |
10 | |
10 | |
11 | This is the superclass for MP transports, most of which is considered an |
11 | This implements the actual transport protocol for MP (it represents a |
12 | implementation detail. |
12 | single link), most of which is considered an implementation detail. |
13 | |
13 | |
14 | See the "PROTOCOL" section below if you want to write another client for |
14 | See the "PROTOCOL" section below if you want to write another client for |
15 | this protocol. |
15 | this protocol. |
16 | |
16 | |
17 | =head1 FUNCTIONS/METHODS |
17 | =head1 FUNCTIONS/METHODS |
… | |
… | |
26 | |
26 | |
27 | use Scalar::Util; |
27 | use Scalar::Util; |
28 | use MIME::Base64 (); |
28 | use MIME::Base64 (); |
29 | use Storable (); |
29 | use Storable (); |
30 | use JSON::XS (); |
30 | use JSON::XS (); |
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31 | |
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32 | use Digest::MD6 (); |
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33 | use Digest::HMAC_MD6 (); |
31 | |
34 | |
32 | use AE (); |
35 | use AE (); |
33 | use AnyEvent::Socket (); |
36 | use AnyEvent::Socket (); |
34 | use AnyEvent::Handle (); |
37 | use AnyEvent::Handle (); |
35 | |
38 | |
… | |
… | |
111 | |
114 | |
112 | =cut |
115 | =cut |
113 | |
116 | |
114 | our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference |
117 | our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference |
115 | our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send |
118 | our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send |
116 | our @AUTH_RCV = (@AUTH_SND, qw(hex_secret)); # auth types we accept |
119 | our @AUTH_RCV = (@AUTH_SND, qw(cleartext)); # auth types we accept |
117 | |
120 | |
118 | #AnyEvent::Handle::register_write_type mp_record => sub { |
121 | #AnyEvent::Handle::register_write_type mp_record => sub { |
119 | #}; |
122 | #}; |
120 | |
123 | |
121 | sub new { |
124 | sub new { |
… | |
… | |
126 | $self->{queue} = []; |
129 | $self->{queue} = []; |
127 | |
130 | |
128 | { |
131 | { |
129 | Scalar::Util::weaken (my $self = $self); |
132 | Scalar::Util::weaken (my $self = $self); |
130 | |
133 | |
131 | $arg{tls_ctx_disabled} ||= { |
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132 | sslv2 => 0, |
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133 | sslv3 => 0, |
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134 | tlsv1 => 1, |
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135 | verify => 1, |
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136 | cert_file => "secret.pem", |
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137 | ca_file => "secret.pem", |
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138 | verify_require_client_cert => 1, |
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139 | }; |
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140 | |
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141 | $arg{secret} = AnyEvent::MP::Base::default_secret () |
134 | $arg{secret} = AnyEvent::MP::Base::default_secret () |
142 | unless exists $arg{secret}; |
135 | unless exists $arg{secret}; |
143 | |
136 | |
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137 | my $secret = $arg{secret}; |
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138 | |
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139 | if ($secret =~ /-----BEGIN RSA PRIVATE KEY-----.*-----END RSA PRIVATE KEY-----.*-----BEGIN CERTIFICATE-----.*-----END CERTIFICATE-----/s) { |
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140 | # assume TLS mode |
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141 | $arg{tls_ctx} = { |
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142 | sslv2 => 0, |
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143 | sslv3 => 0, |
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144 | tlsv1 => 1, |
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145 | verify => 1, |
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146 | cert => $secret, |
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147 | ca_cert => $secret, |
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148 | verify_require_client_cert => 1, |
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149 | }; |
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150 | } |
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151 | |
144 | $self->{hdl} = new AnyEvent::Handle |
152 | $self->{hdl} = new AnyEvent::Handle |
145 | fh => delete $arg{fh}, |
153 | fh => delete $arg{fh}, |
146 | rbuf_max => 64 * 1024, |
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147 | autocork => 1, |
154 | autocork => 1, |
148 | no_delay => 1, |
155 | no_delay => 1, |
149 | on_error => sub { |
156 | on_error => sub { |
150 | $self->error ($_[2]); |
157 | $self->error ($_[2]); |
151 | }, |
158 | }, |
152 | peername => delete $arg{peername}, |
159 | peername => delete $arg{peername}, |
153 | ; |
160 | ; |
154 | |
161 | |
155 | my $secret = $arg{secret}; |
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156 | my $greeting_kv = $self->{greeting} ||= {}; |
162 | my $greeting_kv = $self->{greeting} ||= {}; |
157 | $greeting_kv->{"tls"} = "1.0" |
163 | $greeting_kv->{"tls"} = "1.0" |
158 | if $arg{tls_ctx}; |
164 | if $arg{tls_ctx}; |
159 | $greeting_kv->{provider} = "AE-$VERSION"; |
165 | $greeting_kv->{provider} = "AE-$VERSION"; |
160 | $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; |
166 | $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; |
161 | |
167 | |
162 | # send greeting |
168 | # send greeting |
163 | my $lgreeting1 = "aemp;$PROTOCOL_VERSION;$PROTOCOL_VERSION" # version, min |
169 | my $lgreeting1 = "aemp;$PROTOCOL_VERSION" |
164 | . ";$AnyEvent::MP::Base::UNIQ" |
170 | . ";$AnyEvent::MP::Base::UNIQ" |
165 | . ";$AnyEvent::MP::Base::NODE" |
171 | . ";$AnyEvent::MP::Base::NODE" |
166 | . ";" . (join ",", @AUTH_RCV) |
172 | . ";" . (join ",", @AUTH_RCV) |
167 | . ";" . (join ",", @FRAMINGS) |
173 | . ";" . (join ",", @FRAMINGS) |
168 | . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); |
174 | . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); |
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175 | |
169 | my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; |
176 | my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; |
170 | |
177 | |
171 | $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); |
178 | $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); |
172 | |
179 | |
173 | # expect greeting |
180 | # expect greeting |
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181 | $self->{hdl}->rbuf_max (4 * 1024); |
174 | $self->{hdl}->push_read (line => sub { |
182 | $self->{hdl}->push_read (line => sub { |
175 | my $rgreeting1 = $_[1]; |
183 | my $rgreeting1 = $_[1]; |
176 | |
184 | |
177 | my ($aemp, $version, $version_min, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; |
185 | my ($aemp, $version, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; |
178 | |
186 | |
179 | if ($aemp ne "aemp") { |
187 | if ($aemp ne "aemp") { |
180 | return $self->error ("unparsable greeting"); |
188 | return $self->error ("unparsable greeting"); |
181 | } elsif ($version_min > $PROTOCOL_VERSION) { |
189 | } elsif ($version != $PROTOCOL_VERSION) { |
182 | return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version_min .. $version)"); |
190 | return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version)"); |
183 | } |
191 | } |
184 | |
192 | |
185 | my $s_auth; |
193 | my $s_auth; |
186 | for my $auth_ (split /,/, $auths) { |
194 | for my $auth_ (split /,/, $auths) { |
187 | if (grep $auth_ eq $_, @AUTH_SND) { |
195 | if (grep $auth_ eq $_, @AUTH_SND) { |
… | |
… | |
216 | |
224 | |
217 | # read nonce |
225 | # read nonce |
218 | $self->{hdl}->push_read (line => sub { |
226 | $self->{hdl}->push_read (line => sub { |
219 | my $rgreeting2 = $_[1]; |
227 | my $rgreeting2 = $_[1]; |
220 | |
228 | |
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229 | "$lgreeting1\012$lgreeting2" ne "$rgreeting1\012$rgreeting2" # echo attack? |
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230 | or return $self->error ("authentication error, echo attack?"); |
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231 | |
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232 | my $key = Digest::MD6::md6 $secret; |
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233 | my $lauth; |
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234 | |
221 | if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{tls}) { |
235 | if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{tls}) { |
222 | $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept"; |
236 | $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept"; |
223 | $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
237 | $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
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238 | $s_auth = "tls"; |
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239 | $lauth = ""; |
|
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240 | } else { |
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241 | # we currently only support hmac_md6_64_256 |
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242 | $lauth = Digest::HMAC_MD6::hmac_md6_hex $key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256; |
224 | } |
243 | } |
225 | |
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226 | # auth |
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227 | require Digest::MD6; |
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228 | require Digest::HMAC_MD6; |
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229 | |
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230 | my $key = Digest::MD6::md6 ($secret); |
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231 | my $lauth = Digest::HMAC_MD6::hmac_md6_base64 ($key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256); |
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232 | |
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233 | my $rauth = |
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234 | $s_auth eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_base64 ($key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256) |
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235 | : $s_auth eq "hex_secret" ? unpack "H*", $secret |
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236 | : die; |
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237 | |
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238 | $lauth ne $rauth # echo attack? |
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239 | or return $self->error ("authentication error"); |
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240 | |
244 | |
241 | $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); |
245 | $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); |
242 | |
246 | |
243 | $self->{hdl}->rbuf_max (64); # enough for 44 reply bytes or so |
247 | # read the authentication response |
244 | $self->{hdl}->push_read (line => sub { |
248 | $self->{hdl}->push_read (line => sub { |
245 | my ($hdl, $rline) = @_; |
249 | my ($hdl, $rline) = @_; |
246 | |
250 | |
247 | my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; |
251 | my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; |
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252 | |
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253 | my $rauth = |
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254 | $auth_method eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_hex $key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256 |
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255 | : $auth_method eq "cleartext" ? unpack "H*", $secret |
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256 | : $auth_method eq "tls" ? ($self->{tls} ? "" : "\012\012") # \012\012 never matches |
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257 | : return $self->error ("$auth_method: fatal, selected unsupported auth method"); |
248 | |
258 | |
249 | if ($rauth2 ne $rauth) { |
259 | if ($rauth2 ne $rauth) { |
250 | return $self->error ("authentication failure/shared secret mismatch"); |
260 | return $self->error ("authentication failure/shared secret mismatch"); |
251 | } |
261 | } |
252 | |
262 | |
… | |
… | |
255 | $hdl->rbuf_max (undef); |
265 | $hdl->rbuf_max (undef); |
256 | my $queue = delete $self->{queue}; # we are connected |
266 | my $queue = delete $self->{queue}; # we are connected |
257 | |
267 | |
258 | $self->connected; |
268 | $self->connected; |
259 | |
269 | |
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270 | my $src_node = $self->{node}; |
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271 | |
260 | $hdl->push_write ($self->{s_framing} => $_) |
272 | $hdl->push_write ($self->{s_framing} => $_) |
261 | for @$queue; |
273 | for @$queue; |
262 | |
274 | |
263 | my $rmsg; $rmsg = sub { |
275 | my $rmsg; $rmsg = sub { |
264 | $_[0]->push_read ($r_framing => $rmsg); |
276 | $_[0]->push_read ($r_framing => $rmsg); |
265 | |
277 | |
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278 | local $AnyEvent::MP::Base::SRCNODE = $src_node; |
266 | AnyEvent::MP::Base::_inject ($_[1]); |
279 | AnyEvent::MP::Base::_inject (@{ $_[1] }); |
267 | }; |
280 | }; |
268 | $hdl->push_read ($r_framing => $rmsg); |
281 | $hdl->push_read ($r_framing => $rmsg); |
269 | }); |
282 | }); |
270 | }); |
283 | }); |
271 | }); |
284 | }); |
… | |
… | |
276 | |
289 | |
277 | sub error { |
290 | sub error { |
278 | my ($self, $msg) = @_; |
291 | my ($self, $msg) = @_; |
279 | |
292 | |
280 | if ($self->{node} && $self->{node}{transport} == $self) { |
293 | if ($self->{node} && $self->{node}{transport} == $self) { |
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294 | $self->{node}->fail (transport_error => $msg); |
281 | $self->{node}->clr_transport; |
295 | $self->{node}->clr_transport; |
282 | } |
296 | } |
283 | $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); |
297 | $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); |
284 | $self->destroy; |
298 | $self->destroy; |
285 | } |
299 | } |
… | |
… | |
322 | The greeting consists of two text lines that are ended by either an ASCII |
336 | The greeting consists of two text lines that are ended by either an ASCII |
323 | CR LF pair, or a single ASCII LF (recommended). |
337 | CR LF pair, or a single ASCII LF (recommended). |
324 | |
338 | |
325 | =head2 GREETING |
339 | =head2 GREETING |
326 | |
340 | |
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341 | All the lines until after authentication must not exceed 4kb in length, |
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342 | including delimiter. Afterwards there is no limit on the packet size that |
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343 | can be received. |
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344 | |
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345 | =head3 First Greeting Line |
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346 | |
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347 | Example: |
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348 | |
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349 | aemp;0;fec.4a7720fc;127.0.0.1:1235,[::1]:1235;hmac_md6_64_256;json,storable;provider=AE-0.0 |
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350 | |
327 | The first line contains strings separated (not ended) by C<;> |
351 | The first line contains strings separated (not ended) by C<;> |
328 | characters. The first seven strings are fixed by the protocol, the |
352 | characters. The first even ixtrings are fixed by the protocol, the |
329 | remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> |
353 | remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> |
330 | characters themselves. |
354 | characters themselves. |
331 | |
355 | |
332 | The seven fixed strings are: |
356 | The fixed strings are: |
333 | |
357 | |
334 | =over 4 |
358 | =over 4 |
335 | |
359 | |
336 | =item C<aemp> |
360 | =item protocol identification |
337 | |
361 | |
338 | The constant C<aemp> to identify the protocol. |
362 | The constant C<aemp> to identify the protocol. |
339 | |
363 | |
340 | =item protocol version |
364 | =item protocol version |
341 | |
365 | |
342 | The (maximum) protocol version supported by this end, currently C<0>. |
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343 | |
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344 | =item minimum protocol version |
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345 | |
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346 | The minimum protocol version supported by this end, currently C<0>. |
366 | The protocol version supported by this end, currently C<0>. If the |
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367 | versions don't match then no communication is possible. Minor extensions |
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368 | are supposed to be handled through additional key-value pairs. |
347 | |
369 | |
348 | =item a token uniquely identifying the current node instance |
370 | =item a token uniquely identifying the current node instance |
349 | |
371 | |
350 | This is a string that must change between restarts. It usually contains |
372 | This is a string that must change between restarts. It usually contains |
351 | things like the current time, the (OS) process id or similar values, but |
373 | things like the current time, the (OS) process id or similar values, but |
… | |
… | |
392 | |
414 | |
393 | Indicates that the other side supports TLS (version should be 1.0) and |
415 | Indicates that the other side supports TLS (version should be 1.0) and |
394 | wishes to do a TLS handshake. |
416 | wishes to do a TLS handshake. |
395 | |
417 | |
396 | =back |
418 | =back |
|
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419 | |
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420 | =head3 Second Greeting Line |
397 | |
421 | |
398 | After this greeting line there will be a second line containing a |
422 | After this greeting line there will be a second line containing a |
399 | cryptographic nonce, i.e. random data of high quality. To keep the |
423 | cryptographic nonce, i.e. random data of high quality. To keep the |
400 | protocol text-only, these are usually 32 base64-encoded octets, but |
424 | protocol text-only, these are usually 32 base64-encoded octets, but |
401 | it could be anything that doesn't contain any ASCII CR or ASCII LF |
425 | it could be anything that doesn't contain any ASCII CR or ASCII LF |
402 | characters. |
426 | characters. |
403 | |
427 | |
404 | Example of the two lines of greeting: |
428 | I<< The two nonces B<must> be different, and an aemp implementation |
|
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429 | B<must> check and fail when they are identical >>. |
405 | |
430 | |
406 | aemp;0;0;e7d.4a76f48f;10.0.0.1:4040;hmac_md6_64_256,hex_secret;json,storable;provider=AE-0.0;peeraddr=127.0.0.1:1235 |
431 | Example of a nonce line: |
407 | XntegV2Guvss0qNn7phCPnoU87xqxV+4Mqm/5y4iQm6a |
432 | |
|
|
433 | p/I122ql7kJR8lumW3lXlXCeBnyDAvz8NQo3x5IFowE4 |
408 | |
434 | |
409 | =head2 TLS handshake |
435 | =head2 TLS handshake |
410 | |
436 | |
411 | If, after the handshake, both sides indicate interest in TLS, then the |
437 | I<< If, after the handshake, both sides indicate interest in TLS, then the |
412 | connection I<must> use TLS, or fail. |
438 | connection B<must> use TLS, or fail. >> |
413 | |
439 | |
414 | Both sides compare their nonces, and the side who sent the lower nonce |
440 | Both sides compare their nonces, and the side who sent the lower nonce |
415 | value ("string" comparison on the raw octet values) becomes the client, |
441 | value ("string" comparison on the raw octet values) becomes the client, |
416 | and the one with the higher nonce the server. |
442 | and the one with the higher nonce the server. |
417 | |
443 | |
… | |
… | |
428 | |
454 | |
429 | =item the authentication method chosen |
455 | =item the authentication method chosen |
430 | |
456 | |
431 | This must be one of the methods offered by the other side in the greeting. |
457 | This must be one of the methods offered by the other side in the greeting. |
432 | |
458 | |
|
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459 | The currently supported authentication methods are: |
|
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460 | |
|
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461 | =over 4 |
|
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462 | |
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463 | =item cleartext |
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464 | |
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465 | This is simply the shared secret, lowercase-hex-encoded. This method is of |
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466 | course very insecure, unless TLS is used, which is why this module will |
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467 | accept, but not generate, cleartext auth replies. |
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468 | |
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469 | =item hmac_md6_64_256 |
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470 | |
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471 | This method uses an MD6 HMAC with 64 bit blocksize and 256 bit hash. First, the shared secret |
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472 | is hashed with MD6: |
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473 | |
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474 | key = MD6 (secret) |
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475 | |
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476 | This secret is then used to generate the "local auth reply", by taking |
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477 | the two local greeting lines and the two remote greeting lines (without |
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478 | line endings), appending \012 to all of them, concatenating them and |
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479 | calculating the MD6 HMAC with the key. |
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480 | |
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481 | lauth = HMAC_MD6 key, "lgreeting1\012lgreeting2\012rgreeting1\012rgreeting2\012" |
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482 | |
|
|
483 | This authentication token is then lowercase-hex-encoded and sent to the |
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484 | other side. |
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485 | |
|
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486 | Then the remote auth reply is generated using the same method, but local |
|
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487 | and remote greeting lines swapped: |
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488 | |
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489 | rauth = HMAC_MD6 key, "rgreeting1\012rgreeting2\012lgreeting1\012lgreeting2\012" |
|
|
490 | |
|
|
491 | This is the token that is expected from the other side. |
|
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492 | |
|
|
493 | =item tls |
|
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494 | |
|
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495 | This type is only valid iff TLS was enabled and the TLS handshake |
|
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496 | was successful. It has no authentication data, as the server/client |
|
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497 | certificate was successfully verified. |
|
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498 | |
|
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499 | Implementations supporting TLS I<must> accept this authentication type. |
|
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500 | |
|
|
501 | =back |
|
|
502 | |
433 | =item the authentication data |
503 | =item the authentication data |
434 | |
504 | |
435 | The authentication data itself, usually base64 or hex-encoded data. |
505 | The authentication data itself, usually base64 or hex-encoded data, see |
|
|
506 | above. |
436 | |
507 | |
437 | =item the framing protocol chosen |
508 | =item the framing protocol chosen |
438 | |
509 | |
439 | This must be one of the framing protocols offered by the other side in the |
510 | This must be one of the framing protocols offered by the other side in the |
440 | greeting. Each side must accept the choice of the other side. |
511 | greeting. Each side must accept the choice of the other side. |
441 | |
512 | |
442 | =back |
513 | =back |
443 | |
514 | |
444 | Example (the actual reply matching the previous example): |
515 | Example of an authentication reply: |
445 | |
516 | |
446 | hmac_md6_64_256;wIlLedBY956UCGSISG9mBZRDTG8xUi73/sVse2DSQp0;json |
517 | hmac_md6_64_256;363d5175df38bd9eaddd3f6ca18aa1c0c4aa22f0da245ac638d048398c26b8d3;json |
447 | |
518 | |
448 | =head2 DATA PHASE |
519 | =head2 DATA PHASE |
449 | |
520 | |
450 | After this, packets get exchanged using the chosen framing protocol. It is |
521 | After this, packets get exchanged using the chosen framing protocol. It is |
451 | quite possible that both sides use a different framing protocol. |
522 | quite possible that both sides use a different framing protocol. |
452 | |
523 | |
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524 | =head2 FULL EXAMPLE |
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525 | |
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526 | This is an actual protocol dump of a handshake, followed by a single data |
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527 | packet. The greater than/less than lines indicate the direction of the |
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528 | transfer only. |
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529 | |
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530 | > aemp;0;nndKd+gn;10.0.0.1:4040;hmac_md6_64_256,cleartext;json,storable;provider=AE-0.0;peeraddr=127.0.0.1:1235 |
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531 | > sRG8bbc4TDbkpvH8FTP4HBs87OhepH6VuApoZqXXskuG |
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532 | < aemp;0;nmpKd+gh;127.0.0.1:1235,[::1]:1235;hmac_md6_64_256,cleartext;json,storable;provider=AE-0.0;peeraddr=127.0.0.1:58760 |
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533 | < dCEUcL/LJVSTJcx8byEsOzrwhzJYOq+L3YcopA5T6EAo |
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534 | > hmac_md6_64_256;9513d4b258975accfcb2ab7532b83690e9c119a502c612203332a591c7237788;json |
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535 | < hmac_md6_64_256;0298d6ba2240faabb2b2e881cf86b97d70a113ca74a87dc006f9f1e9d3010f90;json |
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536 | > ["","lookup","pinger","10.0.0.1:4040#nndKd+gn.a","resolved"] |
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537 | |
453 | =head1 SEE ALSO |
538 | =head1 SEE ALSO |
454 | |
539 | |
455 | L<AnyEvent>. |
540 | L<AnyEvent>. |
456 | |
541 | |
457 | =head1 AUTHOR |
542 | =head1 AUTHOR |