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Comparing AnyEvent-MP/MP/Transport.pm (file contents):
Revision 1.7 by root, Mon Aug 3 14:47:25 2009 UTC vs.
Revision 1.25 by root, Thu Aug 6 10:21:48 2009 UTC

1=head1 NAME 1=head1 NAME
2 2
3AnyEvent::MP::Transport - actual transport protocol 3AnyEvent::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
11This is the superclass for MP transports, most of which is considered an 11This implements the actual transport protocol for MP (it represents a
12implementation detail. 12single link), most of which is considered an implementation detail.
13 13
14See the "PROTOCOL" section below if you want to write another client for 14See the "PROTOCOL" section below if you want to write another client for
15this protocol. 15this protocol.
16 16
17=head1 FUNCTIONS/METHODS 17=head1 FUNCTIONS/METHODS
… …
27use Scalar::Util; 27use Scalar::Util;
28use MIME::Base64 (); 28use MIME::Base64 ();
29use Storable (); 29use Storable ();
30use JSON::XS (); 30use JSON::XS ();
31 31
32use Digest::MD6 ();
33use Digest::HMAC_MD6 ();
34
32use AE (); 35use AE ();
33use AnyEvent::Socket (); 36use AnyEvent::Socket ();
34use AnyEvent::Handle (); 37use AnyEvent::Handle ();
35 38
36use base Exporter::; 39use base Exporter::;
… …
43Creates a listener on the given host/port using 46Creates a listener on the given host/port using
44C<AnyEvent::Socket::tcp_server>. 47C<AnyEvent::Socket::tcp_server>.
45 48
46See C<new>, below, for constructor arguments. 49See C<new>, below, for constructor arguments.
47 50
48Defaults for peerhost, peerport, fh and tls are provided. 51Defaults for peerhost, peerport and fh are provided.
49 52
50=cut 53=cut
51 54
52sub mp_server($$@) { 55sub mp_server($$@) {
53 my $cb = pop; 56 my $cb = pop;
… …
58 61
59 $cb->(new AnyEvent::MP::Transport 62 $cb->(new AnyEvent::MP::Transport
60 fh => $fh, 63 fh => $fh,
61 peerhost => $host, 64 peerhost => $host,
62 peerport => $port, 65 peerport => $port,
63 tls => "accept",
64 @args, 66 @args,
65 ); 67 );
66 } 68 }
67} 69}
68 70
… …
82 $cb->(new AnyEvent::MP::Transport 84 $cb->(new AnyEvent::MP::Transport
83 fh => $fh, 85 fh => $fh,
84 peername => $host, 86 peername => $host,
85 peerhost => $nhost, 87 peerhost => $nhost,
86 peerport => $nport, 88 peerport => $nport,
87 tls => "accept",
88 @args, 89 @args,
89 ); 90 );
90 } 91 }
91} 92}
92 93
… …
105 on_eof => sub { clean-close-callback }, 106 on_eof => sub { clean-close-callback },
106 on_connect => sub { successful-connect-callback }, 107 on_connect => sub { successful-connect-callback },
107 greeting => { key => value }, 108 greeting => { key => value },
108 109
109 # tls support 110 # tls support
110 tls => "accept|connect",
111 tls_ctx => AnyEvent::TLS, 111 tls_ctx => AnyEvent::TLS,
112 peername => $peername, # for verification 112 peername => $peername, # for verification
113 ; 113 ;
114 114
115=cut 115=cut
116 116
117our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference 117our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference
118our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send 118our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send
119our @AUTH_RCV = (@AUTH_SND, qw(hex_secret)); # auth types we accept 119our @AUTH_RCV = (@AUTH_SND, qw(cleartext)); # auth types we accept
120 120
121#AnyEvent::Handle::register_write_type mp_record => sub { 121#AnyEvent::Handle::register_write_type mp_record => sub {
122#}; 122#};
123 123
124sub new { 124sub new {
… …
129 $self->{queue} = []; 129 $self->{queue} = [];
130 130
131 { 131 {
132 Scalar::Util::weaken (my $self = $self); 132 Scalar::Util::weaken (my $self = $self);
133 133
134 if (exists $arg{connect}) {
135 $arg{tls} ||= "connect";
136 $arg{tls_ctx} ||= { sslv2 => 0, sslv3 => 0, tlsv1 => 1, verify => 1 };
137 }
138
139 $arg{secret} = AnyEvent::MP::Base::default_secret () 134 $arg{secret} = AnyEvent::MP::Base::default_secret ()
140 unless exists $arg{secret}; 135 unless exists $arg{secret};
141 136
137 $arg{timeout} = 30
138 unless exists $arg{timeout};
139
140 my $keepalive = (int $arg{timeout} * 0.75) || 1;
141
142 my $secret = $arg{secret};
143
144 if ($secret =~ /-----BEGIN RSA PRIVATE KEY-----.*-----END RSA PRIVATE KEY-----.*-----BEGIN CERTIFICATE-----.*-----END CERTIFICATE-----/s) {
145 # assume TLS mode
146 $arg{tls_ctx} = {
147 sslv2 => 0,
148 sslv3 => 0,
149 tlsv1 => 1,
150 verify => 1,
151 cert => $secret,
152 ca_cert => $secret,
153 verify_require_client_cert => 1,
154 };
155 }
156
142 $self->{hdl} = new AnyEvent::Handle 157 $self->{hdl} = new AnyEvent::Handle
143 fh => delete $arg{fh}, 158 fh => delete $arg{fh},
144 rbuf_max => 64 * 1024,
145 autocork => 1, 159 autocork => 1,
146 no_delay => 1, 160 no_delay => 1,
147 on_error => sub { 161 on_error => sub {
148 $self->error ($_[2]); 162 $self->error ($_[2]);
149 }, 163 },
164 timeout => $AnyEvent::MP::Base::CONNECT_TIMEOUT,
150 peername => delete $arg{peername}, 165 peername => delete $arg{peername},
151 ; 166 ;
152 167
153 my $secret = $arg{secret};
154 my $greeting_kv = $self->{greeting} ||= {}; 168 my $greeting_kv = $self->{greeting} ||= {};
169
170 $self->{local_node} = $AnyEvent::MP::Base::NODE;
171
155 $greeting_kv->{"tls1.0"} ||= $arg{tls} 172 $greeting_kv->{"tls"} = "1.0" if $arg{tls_ctx};
156 if exists $arg{tls} && $arg{tls_ctx};
157 $greeting_kv->{provider} = "AE-$VERSION"; 173 $greeting_kv->{provider} = "AE-$VERSION";
158 $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; 174 $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport};
175 $greeting_kv->{maxidle} = $keepalive;
159 176
160 # send greeting 177 # send greeting
161 my $lgreeting1 = "aemp;$PROTOCOL_VERSION;$PROTOCOL_VERSION" # version, min 178 my $lgreeting1 = "aemp;$PROTOCOL_VERSION"
162 . ";$AnyEvent::MP::Base::UNIQ" 179 . ";$AnyEvent::MP::Base::UNIQ"
163 . ";$AnyEvent::MP::Base::NODE" 180 . ";$self->{local_node}"
164 . ";" . (join ",", @AUTH_RCV) 181 . ";" . (join ",", @AUTH_RCV)
165 . ";" . (join ",", @FRAMINGS) 182 . ";" . (join ",", @FRAMINGS)
166 . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); 183 . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv);
184
167 my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; 185 my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), "";
168 186
169 $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); 187 $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012");
170 188
171 # expect greeting 189 # expect greeting
190 $self->{hdl}->rbuf_max (4 * 1024);
172 $self->{hdl}->push_read (line => sub { 191 $self->{hdl}->push_read (line => sub {
173 my $rgreeting1 = $_[1]; 192 my $rgreeting1 = $_[1];
174 193
175 my ($aemp, $version, $version_min, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; 194 my ($aemp, $version, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1;
176 195
177 if ($aemp ne "aemp") { 196 if ($aemp ne "aemp") {
178 return $self->error ("unparsable greeting"); 197 return $self->error ("unparsable greeting");
179 } elsif ($version_min > $PROTOCOL_VERSION) { 198 } elsif ($version != $PROTOCOL_VERSION) {
180 return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version_min .. $version)"); 199 return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version)");
181 } 200 }
182 201
183 my $s_auth; 202 my $s_auth;
184 for my $auth_ (split /,/, $auths) { 203 for my $auth_ (split /,/, $auths) {
185 if (grep $auth_ eq $_, @AUTH_SND) { 204 if (grep $auth_ eq $_, @AUTH_SND) {
… …
210 $self->{remote_greeting} = { 229 $self->{remote_greeting} = {
211 map /^([^=]+)(?:=(.*))?/ ? ($1 => $2) : (), 230 map /^([^=]+)(?:=(.*))?/ ? ($1 => $2) : (),
212 @kv 231 @kv
213 }; 232 };
214 233
215 if (exists $self->{tls} and $self->{tls_ctx} and exists $self->{remote_greeting}{"tls1.0"}) {
216 if ($self->{tls} ne $self->{remote_greeting}{"tls1.0"}) {
217 return $self->error ("TLS server/client mismatch");
218 }
219 $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx});
220 }
221
222 # read nonce 234 # read nonce
223 $self->{hdl}->push_read (line => sub { 235 $self->{hdl}->push_read (line => sub {
224 my $rgreeting2 = $_[1]; 236 my $rgreeting2 = $_[1];
225 237
226 # auth 238 "$lgreeting1\012$lgreeting2" ne "$rgreeting1\012$rgreeting2" # echo attack?
227 require Digest::MD6; 239 or return $self->error ("authentication error, echo attack?");
228 require Digest::HMAC_MD6;
229 240
230 my $key = Digest::MD6::md6_hex ($secret); 241 my $key = Digest::MD6::md6 $secret;
242 my $lauth;
243
244 if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{tls}) {
245 $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept";
246 $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx});
247 $s_auth = "tls";
248 $lauth = "";
249 } else {
250 # we currently only support hmac_md6_64_256
231 my $lauth = Digest::HMAC_MD6::hmac_md6_base64 ($key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256); 251 $lauth = Digest::HMAC_MD6::hmac_md6_hex $key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256;
232
233 my $rauth =
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)
235 : $s_auth eq "hex_secret" ? unpack "H*", $secret
236 : die; 252 }
237
238 $lauth ne $rauth # echo attack?
239 or return $self->error ("authentication error");
240 253
241 $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); 254 $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012");
242 255
243 $self->{hdl}->rbuf_max (64); # enough for 44 reply bytes or so 256 # read the authentication response
244 $self->{hdl}->push_read (line => sub { 257 $self->{hdl}->push_read (line => sub {
245 my ($hdl, $rline) = @_; 258 my ($hdl, $rline) = @_;
246 259
247 my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; 260 my ($auth_method, $rauth2, $r_framing) = split /;/, $rline;
261
262 my $rauth =
263 $auth_method eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_hex $key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256
264 : $auth_method eq "cleartext" ? unpack "H*", $secret
265 : $auth_method eq "tls" ? ($self->{tls} ? "" : "\012\012") # \012\012 never matches
266 : return $self->error ("$auth_method: fatal, selected unsupported auth method");
248 267
249 if ($rauth2 ne $rauth) { 268 if ($rauth2 ne $rauth) {
250 return $self->error ("authentication failure/shared secret mismatch"); 269 return $self->error ("authentication failure/shared secret mismatch");
251 } 270 }
252 271
253 $self->{s_framing} = $s_framing; 272 $self->{s_framing} = $s_framing;
254 273
255 $hdl->rbuf_max (undef); 274 $hdl->rbuf_max (undef);
256 my $queue = delete $self->{queue}; # we are connected 275 my $queue = delete $self->{queue}; # we are connected
257 276
277 $self->{hdl}->timeout ($self->{remote_greeting}{keepalive} + 5)
278 if $self->{remote_greeting}{keepalive};
279
258 $self->connected; 280 $self->connected;
259 281
260 $hdl->push_write ($self->{s_framing} => $_) 282 my $src_node = $self->{node};
283
284 $self->send ($_)
261 for @$queue; 285 for @$queue;
262 286
263 my $rmsg; $rmsg = sub { 287 my $rmsg; $rmsg = sub {
264 $_[0]->push_read ($r_framing => $rmsg); 288 $_[0]->push_read ($r_framing => $rmsg);
265 289
290 local $AnyEvent::MP::Base::SRCNODE = $src_node;
266 AnyEvent::MP::Base::_inject ($_[1]); 291 AnyEvent::MP::Base::_inject (@{ $_[1] });
267 }; 292 };
268 $hdl->push_read ($r_framing => $rmsg); 293 $hdl->push_read ($r_framing => $rmsg);
269 }); 294 });
270 }); 295 });
271 }); 296 });
… …
276 301
277sub error { 302sub error {
278 my ($self, $msg) = @_; 303 my ($self, $msg) = @_;
279 304
280 if ($self->{node} && $self->{node}{transport} == $self) { 305 if ($self->{node} && $self->{node}{transport} == $self) {
306 #TODO: store error, but do not instantly fail
307 $self->{node}->fail (transport_error => $self->{node}{noderef}, $msg);
281 $self->{node}->clr_transport; 308 $self->{node}->clr_transport;
282 } 309 }
283 $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); 310 $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg");
284 $self->destroy; 311 $self->destroy;
285} 312}
286 313
287sub connected { 314sub connected {
288 my ($self) = @_; 315 my ($self) = @_;
289 316
317 if (ref $AnyEvent::MP::Base::SLAVE) {
318 # first connect with a master node
319 my $via = $self->{remote_node};
320 $via =~ s/,/!/g;
321 $AnyEvent::MP::Base::NODE .= "\@$via";
322 $AnyEvent::MP::Base::NODE{$AnyEvent::MP::Base::NODE} = $AnyEvent::MP::Base::NODE{""};
323 $AnyEvent::MP::Base::SLAVE->();
324 }
325
326 if ($self->{local_node} ne $AnyEvent::MP::Base::NODE) {
327 # node changed its name since first greeting
328 $self->send (["", iam => $AnyEvent::MP::Base::NODE]);
329 }
330
290 my $node = AnyEvent::MP::Base::add_node ($self->{remote_node}); 331 my $node = AnyEvent::MP::Base::add_node ($self->{remote_node});
291 Scalar::Util::weaken ($self->{node} = $node); 332 Scalar::Util::weaken ($self->{node} = $node);
292 $node->set_transport ($self); 333 $node->set_transport ($self);
293} 334}
294 335
… …
322The greeting consists of two text lines that are ended by either an ASCII 363The greeting consists of two text lines that are ended by either an ASCII
323CR LF pair, or a single ASCII LF (recommended). 364CR LF pair, or a single ASCII LF (recommended).
324 365
325=head2 GREETING 366=head2 GREETING
326 367
368All the lines until after authentication must not exceed 4kb in length,
369including delimiter. Afterwards there is no limit on the packet size that
370can be received.
371
372=head3 First Greeting Line
373
374Example:
375
376 aemp;0;fec.4a7720fc;127.0.0.1:1235,[::1]:1235;hmac_md6_64_256;json,storable;provider=AE-0.0
377
327The first line contains strings seperated (not ended) by C<;> 378The first line contains strings separated (not ended) by C<;>
328characters. The first seven strings are fixed by the protocol, the 379characters. The first even ixtrings are fixed by the protocol, the
329remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> 380remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;>
330characters themselves. 381characters themselves.
331 382
332The seven fixed strings are: 383The fixed strings are:
333 384
334=over 4 385=over 4
335 386
336=item C<aemp> 387=item protocol identification
337 388
338The constant C<aemp> to identify the protocol. 389The constant C<aemp> to identify the protocol.
339 390
340=item protocol version 391=item protocol version
341 392
342The (maximum) protocol version supported by this end, currently C<0>.
343
344=item minimum protocol version
345
346The minimum protocol version supported by this end, currently C<0>. 393The protocol version supported by this end, currently C<0>. If the
394versions don't match then no communication is possible. Minor extensions
395are supposed to be handled through additional key-value pairs.
347 396
348=item a token uniquely identifying the current node instance 397=item a token uniquely identifying the current node instance
349 398
350This is a string that must change between restarts. It usually contains 399This is a string that must change between restarts. It usually contains
351things like the current time, the (OS) process id or similar values, but 400things like the current time, the (OS) process id or similar values, but
… …
369 418
370A comma-separated list of packet encoding/framign formats understood. The 419A comma-separated list of packet encoding/framign formats understood. The
371receiving side should choose the first framing format it supports for 420receiving side should choose the first framing format it supports for
372sending packets (which might be different from the format it has to accept). 421sending packets (which might be different from the format it has to accept).
373 422
374 . ";$self->{peerhost};$self->{peerport}" 423=back
375 . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); 424
376 my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; 425The remaining arguments are C<KEY=VALUE> pairs. The following key-value
426pairs are known at this time:
427
428=over 4
429
430=item provider=<module-version>
431
432The software provider for this implementation. For AnyEvent::MP, this is
433C<AE-0.0> or whatever version it currently is at.
434
435=item peeraddr=<host>:<port>
436
437The peer address (socket address of the other side) as seen locally, in the same format
438as noderef endpoints.
439
440=item tls=<major>.<minor>
441
442Indicates that the other side supports TLS (version should be 1.0) and
443wishes to do a TLS handshake.
444
445=item maxidle=<seconds>
446
447The maximum amount of time the node will not sent data, i.e., idle. This
448can be used to close the conenction when no data has been received for a
449too-long time (say, maxidle + 5 seconds).
450
451=back
452
453=head3 Second Greeting Line
454
455After this greeting line there will be a second line containing a
456cryptographic nonce, i.e. random data of high quality. To keep the
457protocol text-only, these are usually 32 base64-encoded octets, but
458it could be anything that doesn't contain any ASCII CR or ASCII LF
459characters.
460
461I<< The two nonces B<must> be different, and an aemp implementation
462B<must> check and fail when they are identical >>.
463
464Example of a nonce line:
465
466 p/I122ql7kJR8lumW3lXlXCeBnyDAvz8NQo3x5IFowE4
467
468=head2 TLS handshake
469
470I<< If, after the handshake, both sides indicate interest in TLS, then the
471connection B<must> use TLS, or fail. >>
472
473Both sides compare their nonces, and the side who sent the lower nonce
474value ("string" comparison on the raw octet values) becomes the client,
475and the one with the higher nonce the server.
476
477=head2 AUTHENTICATION PHASE
478
479After the greeting is received (and the optional TLS handshake),
480the authentication phase begins, which consists of sending a single
481C<;>-separated line with three fixed strings and any number of
482C<KEY=VALUE> pairs.
483
484The three fixed strings are:
485
486=over 4
487
488=item the authentication method chosen
489
490This must be one of the methods offered by the other side in the greeting.
491
492The currently supported authentication methods are:
493
494=over 4
495
496=item cleartext
497
498This is simply the shared secret, lowercase-hex-encoded. This method is of
499course very insecure, unless TLS is used, which is why this module will
500accept, but not generate, cleartext auth replies.
501
502=item hmac_md6_64_256
503
504This method uses an MD6 HMAC with 64 bit blocksize and 256 bit hash. First, the shared secret
505is hashed with MD6:
506
507 key = MD6 (secret)
508
509This secret is then used to generate the "local auth reply", by taking
510the two local greeting lines and the two remote greeting lines (without
511line endings), appending \012 to all of them, concatenating them and
512calculating the MD6 HMAC with the key.
513
514 lauth = HMAC_MD6 key, "lgreeting1\012lgreeting2\012rgreeting1\012rgreeting2\012"
515
516This authentication token is then lowercase-hex-encoded and sent to the
517other side.
518
519Then the remote auth reply is generated using the same method, but local
520and remote greeting lines swapped:
521
522 rauth = HMAC_MD6 key, "rgreeting1\012rgreeting2\012lgreeting1\012lgreeting2\012"
523
524This is the token that is expected from the other side.
525
526=item tls
527
528This type is only valid iff TLS was enabled and the TLS handshake
529was successful. It has no authentication data, as the server/client
530certificate was successfully verified.
531
532Implementations supporting TLS I<must> accept this authentication type.
533
534=back
535
536=item the authentication data
537
538The authentication data itself, usually base64 or hex-encoded data, see
539above.
540
541=item the framing protocol chosen
542
543This must be one of the framing protocols offered by the other side in the
544greeting. Each side must accept the choice of the other side.
545
546=back
547
548Example of an authentication reply:
549
550 hmac_md6_64_256;363d5175df38bd9eaddd3f6ca18aa1c0c4aa22f0da245ac638d048398c26b8d3;json
551
552=head2 DATA PHASE
553
554After this, packets get exchanged using the chosen framing protocol. It is
555quite possible that both sides use a different framing protocol.
556
557=head2 FULL EXAMPLE
558
559This is an actual protocol dump of a handshake, followed by a single data
560packet. The greater than/less than lines indicate the direction of the
561transfer only.
562
563 > 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
564 > sRG8bbc4TDbkpvH8FTP4HBs87OhepH6VuApoZqXXskuG
565 < 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
566 < dCEUcL/LJVSTJcx8byEsOzrwhzJYOq+L3YcopA5T6EAo
567 > hmac_md6_64_256;9513d4b258975accfcb2ab7532b83690e9c119a502c612203332a591c7237788;json
568 < hmac_md6_64_256;0298d6ba2240faabb2b2e881cf86b97d70a113ca74a87dc006f9f1e9d3010f90;json
569 > ["","lookup","pinger","10.0.0.1:4040#nndKd+gn.a","resolved"]
570
377=head1 SEE ALSO 571=head1 SEE ALSO
378 572
379L<AnyEvent>. 573L<AnyEvent>.
380 574
381=head1 AUTHOR 575=head1 AUTHOR

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