| 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 |
| … | |
… | |
| 43 | Creates a listener on the given host/port using |
43 | Creates a listener on the given host/port using |
| 44 | C<AnyEvent::Socket::tcp_server>. |
44 | C<AnyEvent::Socket::tcp_server>. |
| 45 | |
45 | |
| 46 | See C<new>, below, for constructor arguments. |
46 | See C<new>, below, for constructor arguments. |
| 47 | |
47 | |
| 48 | Defaults for peerhost, peerport, fh and tls are provided. |
48 | Defaults for peerhost, peerport and fh are provided. |
| 49 | |
49 | |
| 50 | =cut |
50 | =cut |
| 51 | |
51 | |
| 52 | sub mp_server($$@) { |
52 | sub mp_server($$@) { |
| 53 | my $cb = pop; |
53 | my $cb = pop; |
| … | |
… | |
| 58 | |
58 | |
| 59 | $cb->(new AnyEvent::MP::Transport |
59 | $cb->(new AnyEvent::MP::Transport |
| 60 | fh => $fh, |
60 | fh => $fh, |
| 61 | peerhost => $host, |
61 | peerhost => $host, |
| 62 | peerport => $port, |
62 | peerport => $port, |
| 63 | tls => "accept", |
|
|
| 64 | @args, |
63 | @args, |
| 65 | ); |
64 | ); |
| 66 | } |
65 | } |
| 67 | } |
66 | } |
| 68 | |
67 | |
| … | |
… | |
| 82 | $cb->(new AnyEvent::MP::Transport |
81 | $cb->(new AnyEvent::MP::Transport |
| 83 | fh => $fh, |
82 | fh => $fh, |
| 84 | peername => $host, |
83 | peername => $host, |
| 85 | peerhost => $nhost, |
84 | peerhost => $nhost, |
| 86 | peerport => $nport, |
85 | peerport => $nport, |
| 87 | tls => "accept", |
|
|
| 88 | @args, |
86 | @args, |
| 89 | ); |
87 | ); |
| 90 | } |
88 | } |
| 91 | } |
89 | } |
| 92 | |
90 | |
| … | |
… | |
| 105 | on_eof => sub { clean-close-callback }, |
103 | on_eof => sub { clean-close-callback }, |
| 106 | on_connect => sub { successful-connect-callback }, |
104 | on_connect => sub { successful-connect-callback }, |
| 107 | greeting => { key => value }, |
105 | greeting => { key => value }, |
| 108 | |
106 | |
| 109 | # tls support |
107 | # tls support |
| 110 | tls => "accept|connect", |
|
|
| 111 | tls_ctx => AnyEvent::TLS, |
108 | tls_ctx => AnyEvent::TLS, |
| 112 | peername => $peername, # for verification |
109 | peername => $peername, # for verification |
| 113 | ; |
110 | ; |
| 114 | |
111 | |
| 115 | =cut |
112 | =cut |
| 116 | |
113 | |
| 117 | our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference |
114 | our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference |
| 118 | our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send |
115 | our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send |
| 119 | our @AUTH_RCV = (@AUTH_SND, qw(hex_secret)); # auth types we accept |
116 | our @AUTH_RCV = (@AUTH_SND, qw(cleartext)); # auth types we accept |
| 120 | |
117 | |
| 121 | #AnyEvent::Handle::register_write_type mp_record => sub { |
118 | #AnyEvent::Handle::register_write_type mp_record => sub { |
| 122 | #}; |
119 | #}; |
| 123 | |
120 | |
| 124 | sub new { |
121 | sub new { |
| … | |
… | |
| 129 | $self->{queue} = []; |
126 | $self->{queue} = []; |
| 130 | |
127 | |
| 131 | { |
128 | { |
| 132 | Scalar::Util::weaken (my $self = $self); |
129 | Scalar::Util::weaken (my $self = $self); |
| 133 | |
130 | |
| 134 | if (exists $arg{connect}) { |
131 | $arg{tls_ctx_disabled} ||= { |
| 135 | $arg{tls_ctx} ||= { sslv2 => 0, sslv3 => 0, tlsv1 => 1, verify => 1 }; |
132 | sslv2 => 0, |
|
|
133 | sslv3 => 0, |
|
|
134 | tlsv1 => 1, |
|
|
135 | verify => 1, |
|
|
136 | cert_file => "secret.pem", |
|
|
137 | ca_file => "secret.pem", |
|
|
138 | verify_require_client_cert => 1, |
| 136 | } |
139 | }; |
| 137 | |
140 | |
| 138 | $arg{secret} = AnyEvent::MP::Base::default_secret () |
141 | $arg{secret} = AnyEvent::MP::Base::default_secret () |
| 139 | unless exists $arg{secret}; |
142 | unless exists $arg{secret}; |
| 140 | |
143 | |
| 141 | $self->{hdl} = new AnyEvent::Handle |
144 | $self->{hdl} = new AnyEvent::Handle |
| 142 | fh => delete $arg{fh}, |
145 | fh => delete $arg{fh}, |
| 143 | rbuf_max => 64 * 1024, |
|
|
| 144 | autocork => 1, |
146 | autocork => 1, |
| 145 | no_delay => 1, |
147 | no_delay => 1, |
| 146 | on_error => sub { |
148 | on_error => sub { |
| 147 | $self->error ($_[2]); |
149 | $self->error ($_[2]); |
| 148 | }, |
150 | }, |
| … | |
… | |
| 155 | if $arg{tls_ctx}; |
157 | if $arg{tls_ctx}; |
| 156 | $greeting_kv->{provider} = "AE-$VERSION"; |
158 | $greeting_kv->{provider} = "AE-$VERSION"; |
| 157 | $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; |
159 | $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; |
| 158 | |
160 | |
| 159 | # send greeting |
161 | # send greeting |
| 160 | my $lgreeting1 = "aemp;$PROTOCOL_VERSION;$PROTOCOL_VERSION" # version, min |
162 | my $lgreeting1 = "aemp;$PROTOCOL_VERSION" |
| 161 | . ";$AnyEvent::MP::Base::UNIQ" |
163 | . ";$AnyEvent::MP::Base::UNIQ" |
| 162 | . ";$AnyEvent::MP::Base::NODE" |
164 | . ";$AnyEvent::MP::Base::NODE" |
| 163 | . ";" . (join ",", @AUTH_RCV) |
165 | . ";" . (join ",", @AUTH_RCV) |
| 164 | . ";" . (join ",", @FRAMINGS) |
166 | . ";" . (join ",", @FRAMINGS) |
| 165 | . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); |
167 | . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); |
|
|
168 | |
| 166 | my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; |
169 | my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; |
| 167 | |
170 | |
| 168 | $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); |
171 | $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); |
| 169 | |
172 | |
| 170 | # expect greeting |
173 | # expect greeting |
|
|
174 | $self->{hdl}->rbuf_max (4 * 1024); |
| 171 | $self->{hdl}->push_read (line => sub { |
175 | $self->{hdl}->push_read (line => sub { |
| 172 | my $rgreeting1 = $_[1]; |
176 | my $rgreeting1 = $_[1]; |
| 173 | |
177 | |
| 174 | my ($aemp, $version, $version_min, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; |
178 | my ($aemp, $version, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; |
| 175 | |
179 | |
| 176 | if ($aemp ne "aemp") { |
180 | if ($aemp ne "aemp") { |
| 177 | return $self->error ("unparsable greeting"); |
181 | return $self->error ("unparsable greeting"); |
| 178 | } elsif ($version_min > $PROTOCOL_VERSION) { |
182 | } elsif ($version != $PROTOCOL_VERSION) { |
| 179 | return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version_min .. $version)"); |
183 | return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version)"); |
| 180 | } |
184 | } |
| 181 | |
185 | |
| 182 | my $s_auth; |
186 | my $s_auth; |
| 183 | for my $auth_ (split /,/, $auths) { |
187 | for my $auth_ (split /,/, $auths) { |
| 184 | if (grep $auth_ eq $_, @AUTH_SND) { |
188 | if (grep $auth_ eq $_, @AUTH_SND) { |
| … | |
… | |
| 213 | |
217 | |
| 214 | # read nonce |
218 | # read nonce |
| 215 | $self->{hdl}->push_read (line => sub { |
219 | $self->{hdl}->push_read (line => sub { |
| 216 | my $rgreeting2 = $_[1]; |
220 | my $rgreeting2 = $_[1]; |
| 217 | |
221 | |
| 218 | if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{"tls"}) { |
222 | if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{tls}) { |
| 219 | $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept"; |
223 | $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept"; |
| 220 | $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
224 | $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
| 221 | } |
225 | } |
| 222 | |
226 | |
| 223 | # auth |
227 | # auth |
| 224 | require Digest::MD6; |
228 | require Digest::MD6; |
| 225 | require Digest::HMAC_MD6; |
229 | require Digest::HMAC_MD6; |
| 226 | |
230 | |
| 227 | my $key = Digest::MD6::md6_hex ($secret); |
231 | my $key = Digest::MD6::md6 ($secret); |
| 228 | my $lauth = Digest::HMAC_MD6::hmac_md6_base64 ($key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256); |
232 | my $lauth = Digest::HMAC_MD6::hmac_md6_hex ($key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256); |
| 229 | |
233 | |
| 230 | my $rauth = |
234 | my $rauth = |
| 231 | $s_auth eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_base64 ($key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256) |
235 | $s_auth eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_hex ($key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256) |
| 232 | : $s_auth eq "hex_secret" ? unpack "H*", $secret |
236 | : $s_auth eq "cleartext" ? unpack "H*", $secret |
| 233 | : die; |
237 | : die; |
| 234 | |
238 | |
| 235 | $lauth ne $rauth # echo attack? |
239 | $lauth ne $rauth # echo attack? |
| 236 | or return $self->error ("authentication error"); |
240 | or return $self->error ("authentication error"); |
| 237 | |
241 | |
| 238 | $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); |
242 | $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); |
| 239 | |
243 | |
| 240 | $self->{hdl}->rbuf_max (64); # enough for 44 reply bytes or so |
244 | # reasd the authentication response |
| 241 | $self->{hdl}->push_read (line => sub { |
245 | $self->{hdl}->push_read (line => sub { |
| 242 | my ($hdl, $rline) = @_; |
246 | my ($hdl, $rline) = @_; |
| 243 | |
247 | |
| 244 | my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; |
248 | my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; |
| 245 | |
249 | |
| … | |
… | |
| 252 | $hdl->rbuf_max (undef); |
256 | $hdl->rbuf_max (undef); |
| 253 | my $queue = delete $self->{queue}; # we are connected |
257 | my $queue = delete $self->{queue}; # we are connected |
| 254 | |
258 | |
| 255 | $self->connected; |
259 | $self->connected; |
| 256 | |
260 | |
|
|
261 | my $src_node = $self->{node}; |
|
|
262 | |
| 257 | $hdl->push_write ($self->{s_framing} => $_) |
263 | $hdl->push_write ($self->{s_framing} => $_) |
| 258 | for @$queue; |
264 | for @$queue; |
| 259 | |
265 | |
| 260 | my $rmsg; $rmsg = sub { |
266 | my $rmsg; $rmsg = sub { |
| 261 | $_[0]->push_read ($r_framing => $rmsg); |
267 | $_[0]->push_read ($r_framing => $rmsg); |
| 262 | |
268 | |
|
|
269 | local $AnyEvent::MP::Base::SRCNODE = $src_node; |
| 263 | AnyEvent::MP::Base::_inject ($_[1]); |
270 | AnyEvent::MP::Base::_inject (@{ $_[1] }); |
| 264 | }; |
271 | }; |
| 265 | $hdl->push_read ($r_framing => $rmsg); |
272 | $hdl->push_read ($r_framing => $rmsg); |
| 266 | }); |
273 | }); |
| 267 | }); |
274 | }); |
| 268 | }); |
275 | }); |
| … | |
… | |
| 273 | |
280 | |
| 274 | sub error { |
281 | sub error { |
| 275 | my ($self, $msg) = @_; |
282 | my ($self, $msg) = @_; |
| 276 | |
283 | |
| 277 | if ($self->{node} && $self->{node}{transport} == $self) { |
284 | if ($self->{node} && $self->{node}{transport} == $self) { |
|
|
285 | $self->{node}->fail (transport_error => $msg); |
| 278 | $self->{node}->clr_transport; |
286 | $self->{node}->clr_transport; |
| 279 | } |
287 | } |
| 280 | $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); |
288 | $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); |
| 281 | $self->destroy; |
289 | $self->destroy; |
| 282 | } |
290 | } |
| … | |
… | |
| 319 | The greeting consists of two text lines that are ended by either an ASCII |
327 | The greeting consists of two text lines that are ended by either an ASCII |
| 320 | CR LF pair, or a single ASCII LF (recommended). |
328 | CR LF pair, or a single ASCII LF (recommended). |
| 321 | |
329 | |
| 322 | =head2 GREETING |
330 | =head2 GREETING |
| 323 | |
331 | |
|
|
332 | All the lines until after authentication must not exceed 4kb in length, |
|
|
333 | including delimiter. Afterwards there is no limit on the packet size that |
|
|
334 | can be received. |
|
|
335 | |
|
|
336 | =head3 First Greeting Line |
|
|
337 | |
|
|
338 | Example: |
|
|
339 | |
|
|
340 | aemp;0;fec.4a7720fc;127.0.0.1:1235,[::1]:1235;hmac_md6_64_256;json,storable;provider=AE-0.0 |
|
|
341 | |
| 324 | The first line contains strings separated (not ended) by C<;> |
342 | The first line contains strings separated (not ended) by C<;> |
| 325 | characters. The first seven strings are fixed by the protocol, the |
343 | characters. The first even ixtrings are fixed by the protocol, the |
| 326 | remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> |
344 | remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> |
| 327 | characters themselves. |
345 | characters themselves. |
| 328 | |
346 | |
| 329 | The seven fixed strings are: |
347 | The fixed strings are: |
| 330 | |
348 | |
| 331 | =over 4 |
349 | =over 4 |
| 332 | |
350 | |
| 333 | =item C<aemp> |
351 | =item protocol identification |
| 334 | |
352 | |
| 335 | The constant C<aemp> to identify the protocol. |
353 | The constant C<aemp> to identify the protocol. |
| 336 | |
354 | |
| 337 | =item protocol version |
355 | =item protocol version |
| 338 | |
356 | |
| 339 | The (maximum) protocol version supported by this end, currently C<0>. |
|
|
| 340 | |
|
|
| 341 | =item minimum protocol version |
|
|
| 342 | |
|
|
| 343 | The minimum protocol version supported by this end, currently C<0>. |
357 | The protocol version supported by this end, currently C<0>. If the |
|
|
358 | versions don't match then no communication is possible. Minor extensions |
|
|
359 | are supposed to be handled through additional key-value pairs. |
| 344 | |
360 | |
| 345 | =item a token uniquely identifying the current node instance |
361 | =item a token uniquely identifying the current node instance |
| 346 | |
362 | |
| 347 | This is a string that must change between restarts. It usually contains |
363 | This is a string that must change between restarts. It usually contains |
| 348 | things like the current time, the (OS) process id or similar values, but |
364 | things like the current time, the (OS) process id or similar values, but |
| … | |
… | |
| 366 | |
382 | |
| 367 | A comma-separated list of packet encoding/framign formats understood. The |
383 | A comma-separated list of packet encoding/framign formats understood. The |
| 368 | receiving side should choose the first framing format it supports for |
384 | receiving side should choose the first framing format it supports for |
| 369 | sending packets (which might be different from the format it has to accept). |
385 | sending packets (which might be different from the format it has to accept). |
| 370 | |
386 | |
| 371 | =cut |
387 | =back |
| 372 | |
388 | |
| 373 | The remaining arguments are C<KEY=VALUE> pairs. The following key-value |
389 | The remaining arguments are C<KEY=VALUE> pairs. The following key-value |
| 374 | pairs are known at this time: |
390 | pairs are known at this time: |
| 375 | |
391 | |
| 376 | =over 4 |
392 | =over 4 |
| … | |
… | |
| 389 | |
405 | |
| 390 | Indicates that the other side supports TLS (version should be 1.0) and |
406 | Indicates that the other side supports TLS (version should be 1.0) and |
| 391 | wishes to do a TLS handshake. |
407 | wishes to do a TLS handshake. |
| 392 | |
408 | |
| 393 | =back |
409 | =back |
|
|
410 | |
|
|
411 | =head3 Second Greeting Line |
| 394 | |
412 | |
| 395 | After this greeting line there will be a second line containing a |
413 | After this greeting line there will be a second line containing a |
| 396 | cryptographic nonce, i.e. random data of high quality. To keep the |
414 | cryptographic nonce, i.e. random data of high quality. To keep the |
| 397 | protocol text-only, these are usually 32 base64-encoded octets, but |
415 | protocol text-only, these are usually 32 base64-encoded octets, but |
| 398 | it could be anything that doesn't contain any ASCII CR or ASCII LF |
416 | it could be anything that doesn't contain any ASCII CR or ASCII LF |
| 399 | characters. |
417 | characters. |
| 400 | |
418 | |
| 401 | Example of the two lines of greeting: |
419 | I<< The two nonces B<must> be different, and an aemp implementation |
|
|
420 | B<must> check and fail when they are identical >>. |
| 402 | |
421 | |
| 403 | 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 |
422 | Example of a nonce line: |
| 404 | XntegV2Guvss0qNn7phCPnoU87xqxV+4Mqm/5y4iQm6a |
423 | |
|
|
424 | p/I122ql7kJR8lumW3lXlXCeBnyDAvz8NQo3x5IFowE4 |
| 405 | |
425 | |
| 406 | =head2 TLS handshake |
426 | =head2 TLS handshake |
| 407 | |
427 | |
| 408 | If, after the handshake, both sides indicate interest in TLS, then the |
428 | I<< If, after the handshake, both sides indicate interest in TLS, then the |
| 409 | connection I<must> use TLS, or fail. |
429 | connection B<must> use TLS, or fail.>> |
| 410 | |
430 | |
| 411 | Both sides compare their nonces, and the side who sent the lower nonce |
431 | Both sides compare their nonces, and the side who sent the lower nonce |
| 412 | value ("string" comparison on the raw octet values) becomes the client, |
432 | value ("string" comparison on the raw octet values) becomes the client, |
| 413 | and the one with the higher nonce the server. |
433 | and the one with the higher nonce the server. |
| 414 | |
434 | |
| … | |
… | |
| 425 | |
445 | |
| 426 | =item the authentication method chosen |
446 | =item the authentication method chosen |
| 427 | |
447 | |
| 428 | This must be one of the methods offered by the other side in the greeting. |
448 | This must be one of the methods offered by the other side in the greeting. |
| 429 | |
449 | |
|
|
450 | The currently supported authentication methods are: |
|
|
451 | |
|
|
452 | =over 4 |
|
|
453 | |
|
|
454 | =item cleartext |
|
|
455 | |
|
|
456 | This is simply the shared secret, lowercase-hex-encoded. This method is of |
|
|
457 | course very insecure, unless TLS is used, which is why this module will |
|
|
458 | accept, but not generate, cleartext auth replies. |
|
|
459 | |
|
|
460 | =item hmac_md6_64_256 |
|
|
461 | |
|
|
462 | This method uses an MD6 HMAC with 64 bit blocksize and 256 bit hash. First, the shared secret |
|
|
463 | is hashed with MD6: |
|
|
464 | |
|
|
465 | key = MD6 (secret) |
|
|
466 | |
|
|
467 | This secret is then used to generate the "local auth reply", by taking |
|
|
468 | the two local greeting lines and the two remote greeting lines (without |
|
|
469 | line endings), appending \012 to all of them, concatenating them and |
|
|
470 | calculating the MD6 HMAC with the key. |
|
|
471 | |
|
|
472 | lauth = HMAC_MD6 key, "lgreeting1\012lgreeting2\012rgreeting1\012rgreeting2\012" |
|
|
473 | |
|
|
474 | This authentication token is then lowercase-hex-encoded and sent to the |
|
|
475 | other side. |
|
|
476 | |
|
|
477 | Then the remote auth reply is generated using the same method, but local |
|
|
478 | and remote greeting lines swapped: |
|
|
479 | |
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480 | rauth = HMAC_MD6 key, "rgreeting1\012rgreeting2\012lgreeting1\012lgreeting2\012" |
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481 | |
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482 | This is the token that is expected from the other side. |
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483 | |
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484 | =back |
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485 | |
| 430 | =item the authentication data |
486 | =item the authentication data |
| 431 | |
487 | |
| 432 | The authentication data itself, usually base64 or hex-encoded data. |
488 | The authentication data itself, usually base64 or hex-encoded data, see |
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489 | above. |
| 433 | |
490 | |
| 434 | =item the framing protocol chosen |
491 | =item the framing protocol chosen |
| 435 | |
492 | |
| 436 | This must be one of the framing protocols offered by the other side in the |
493 | This must be one of the framing protocols offered by the other side in the |
| 437 | greeting. Each side must accept the choice of the other side. |
494 | greeting. Each side must accept the choice of the other side. |
| 438 | |
495 | |
| 439 | =back |
496 | =back |
| 440 | |
497 | |
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498 | Example of an authentication reply: |
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499 | |
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500 | hmac_md6_64_256;363d5175df38bd9eaddd3f6ca18aa1c0c4aa22f0da245ac638d048398c26b8d3;json |
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501 | |
| 441 | =head2 DATA PHASE |
502 | =head2 DATA PHASE |
| 442 | |
503 | |
| 443 | After this, packets get exchanged using the chosen framing protocol. It is |
504 | After this, packets get exchanged using the chosen framing protocol. It is |
| 444 | quite possible that both sides use a different framing protocol. |
505 | quite possible that both sides use a different framing protocol. |
| 445 | |
506 | |
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507 | =head2 FULL EXAMPLE |
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508 | |
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509 | This is an actual protocol dump of a handshake, followed by a single data |
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510 | packet. The greater than/less than lines indicate the direction of the |
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511 | transfer only. |
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512 | |
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513 | > 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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514 | > sRG8bbc4TDbkpvH8FTP4HBs87OhepH6VuApoZqXXskuG |
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515 | < 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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516 | < dCEUcL/LJVSTJcx8byEsOzrwhzJYOq+L3YcopA5T6EAo |
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517 | > hmac_md6_64_256;9513d4b258975accfcb2ab7532b83690e9c119a502c612203332a591c7237788;json |
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518 | < hmac_md6_64_256;0298d6ba2240faabb2b2e881cf86b97d70a113ca74a87dc006f9f1e9d3010f90;json |
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519 | > ["","lookup","pinger","10.0.0.1:4040#nndKd+gn.a","resolved"] |
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520 | |
| 446 | =head1 SEE ALSO |
521 | =head1 SEE ALSO |
| 447 | |
522 | |
| 448 | L<AnyEvent>. |
523 | L<AnyEvent>. |
| 449 | |
524 | |
| 450 | =head1 AUTHOR |
525 | =head1 AUTHOR |
