[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent/Handle.pm

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC vs.
Revision 1.148 by root, Fri Jul 10 22:35:28 2009 UTC

…		…
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		16
17	=cut	17	=cut
18		18
19	our $VERSION = 4.22;	19	our $VERSION = 4.82;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
…		…
27		27
28	my $handle =	28	my $handle =
29	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
30	fh => \*STDIN,	30	fh => \*STDIN,
31	on_eof => sub {	31	on_eof => sub {
32	$cv->broadcast;	32	$cv->send;
33	},	33	},
34	);	34	);
35		35
36	# send some request line	36	# send some request line
37	$handle->push_write ("getinfo\015\012");	37	$handle->push_write ("getinfo\015\012");
…		…
49		49
50	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
52	on sockets see L<AnyEvent::Util>.	52	on sockets see L<AnyEvent::Util>.
53		53
		54	The L<AnyEvent::Intro> tutorial contains some well-documented
		55	AnyEvent::Handle examples.
		56
54	In the following, when the documentation refers to of "bytes" then this	57	In the following, when the documentation refers to of "bytes" then this
55	means characters. As sysread and syswrite are used for all I/O, their	58	means characters. As sysread and syswrite are used for all I/O, their
56	treatment of characters applies to this module as well.	59	treatment of characters applies to this module as well.
57		60
58	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
…		…
60		63
61	=head1 METHODS	64	=head1 METHODS
62		65
63	=over 4	66	=over 4
64		67
65	=item B<new (%args)>	68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
66		69
67	The constructor supports these arguments (all as key => value pairs).	70	The constructor supports these arguments (all as C<< key => value >> pairs).
68		71
69	=over 4	72	=over 4
70		73
71	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [MANDATORY]
72		75
73	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
74		77
75	NOTE: The filehandle will be set to non-blocking (using	78	NOTE: The filehandle will be set to non-blocking mode (using
76	AnyEvent::Util::fh_nonblocking).	79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		80	that mode.
77		81
78	=item on_eof => $cb->($handle)	82	=item on_eof => $cb->($handle)
79		83
80	Set the callback to be called when an end-of-file condition is detected,	84	Set the callback to be called when an end-of-file condition is detected,
81	i.e. in the case of a socket, when the other side has closed the	85	i.e. in the case of a socket, when the other side has closed the
82	connection cleanly.	86	connection cleanly.
83		87
		88	For sockets, this just means that the other side has stopped sending data,
		89	you can still try to write data, and, in fact, one can return from the EOF
		90	callback and continue writing data, as only the read part has been shut
		91	down.
		92
84	While not mandatory, it is I<highly> recommended to set an eof callback,	93	While not mandatory, it is I<highly> recommended to set an EOF callback,
85	otherwise you might end up with a closed socket while you are still	94	otherwise you might end up with a closed socket while you are still
86	waiting for data.	95	waiting for data.
87		96
88	If an EOF condition has been detected but no C<on_eof> callback has been	97	If an EOF condition has been detected but no C<on_eof> callback has been
89	set, then a fatal error will be raised with C<$!> set to <0>.	98	set, then a fatal error will be raised with C<$!> set to <0>.
90		99
91	=item on_error => $cb->($handle, $fatal)	100	=item on_error => $cb->($handle, $fatal, $message)
92		101
93	This is the error callback, which is called when, well, some error	102	This is the error callback, which is called when, well, some error
94	occured, such as not being able to resolve the hostname, failure to	103	occured, such as not being able to resolve the hostname, failure to
95	connect or a read error.	104	connect or a read error.
96		105
97	Some errors are fatal (which is indicated by C<$fatal> being true). On	106	Some errors are fatal (which is indicated by C<$fatal> being true). On
98	fatal errors the handle object will be shut down and will not be	107	fatal errors the handle object will be shut down and will not be usable
		108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
		109	errors are an EOF condition with active (but unsatisifable) read watchers
		110	(C<EPIPE>) or I/O errors.
		111
		112	AnyEvent::Handle tries to find an appropriate error code for you to check
		113	against, but in some cases (TLS errors), this does not work well. It is
		114	recommended to always output the C<$message> argument in human-readable
		115	error messages (it's usually the same as C<"$!">).
		116
99	usable. Non-fatal errors can be retried by simply returning, but it is	117	Non-fatal errors can be retried by simply returning, but it is recommended
100	recommended to simply ignore this parameter and instead abondon the handle	118	to simply ignore this parameter and instead abondon the handle object
101	object when this callback is invoked.	119	when this callback is invoked. Examples of non-fatal errors are timeouts
		120	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
102		121
103	On callback entrance, the value of C<$!> contains the operating system	122	On callback entrance, the value of C<$!> contains the operating system
104	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	123	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		124	C<EPROTO>).
105		125
106	While not mandatory, it is I<highly> recommended to set this callback, as	126	While not mandatory, it is I<highly> recommended to set this callback, as
107	you will not be notified of errors otherwise. The default simply calls	127	you will not be notified of errors otherwise. The default simply calls
108	C<croak>.	128	C<croak>.
109		129
…		…
113	and no read request is in the queue (unlike read queue callbacks, this	133	and no read request is in the queue (unlike read queue callbacks, this
114	callback will only be called when at least one octet of data is in the	134	callback will only be called when at least one octet of data is in the
115	read buffer).	135	read buffer).
116		136
117	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	137	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
118	method or access the C<$handle->{rbuf}> member directly.	138	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		139	must not enlarge or modify the read buffer, you can only remove data at
		140	the beginning from it.
119		141
120	When an EOF condition is detected then AnyEvent::Handle will first try to	142	When an EOF condition is detected then AnyEvent::Handle will first try to
121	feed all the remaining data to the queued callbacks and C<on_read> before	143	feed all the remaining data to the queued callbacks and C<on_read> before
122	calling the C<on_eof> callback. If no progress can be made, then a fatal	144	calling the C<on_eof> callback. If no progress can be made, then a fatal
123	error will be raised (with C<$!> set to C<EPIPE>).	145	error will be raised (with C<$!> set to C<EPIPE>).
…		…
138	=item timeout => $fractional_seconds	160	=item timeout => $fractional_seconds
139		161
140	If non-zero, then this enables an "inactivity" timeout: whenever this many	162	If non-zero, then this enables an "inactivity" timeout: whenever this many
141	seconds pass without a successful read or write on the underlying file	163	seconds pass without a successful read or write on the underlying file
142	handle, the C<on_timeout> callback will be invoked (and if that one is	164	handle, the C<on_timeout> callback will be invoked (and if that one is
143	missing, an C<ETIMEDOUT> error will be raised).	165	missing, a non-fatal C<ETIMEDOUT> error will be raised).
144		166
145	Note that timeout processing is also active when you currently do not have	167	Note that timeout processing is also active when you currently do not have
146	any outstanding read or write requests: If you plan to keep the connection	168	any outstanding read or write requests: If you plan to keep the connection
147	idle then you should disable the timout temporarily or ignore the timeout	169	idle then you should disable the timout temporarily or ignore the timeout
148	in the C<on_timeout> callback.	170	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		171	restart the timeout.
149		172
150	Zero (the default) disables this timeout.	173	Zero (the default) disables this timeout.
151		174
152	=item on_timeout => $cb->($handle)	175	=item on_timeout => $cb->($handle)
153		176
…		…
157		180
158	=item rbuf_max => <bytes>	181	=item rbuf_max => <bytes>
159		182
160	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	183	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
161	when the read buffer ever (strictly) exceeds this size. This is useful to	184	when the read buffer ever (strictly) exceeds this size. This is useful to
162	avoid denial-of-service attacks.	185	avoid some forms of denial-of-service attacks.
163		186
164	For example, a server accepting connections from untrusted sources should	187	For example, a server accepting connections from untrusted sources should
165	be configured to accept only so-and-so much data that it cannot act on	188	be configured to accept only so-and-so much data that it cannot act on
166	(for example, when expecting a line, an attacker could send an unlimited	189	(for example, when expecting a line, an attacker could send an unlimited
167	amount of data without a callback ever being called as long as the line	190	amount of data without a callback ever being called as long as the line
168	isn't finished).	191	isn't finished).
169		192
170	=item autocork => <boolean>	193	=item autocork => <boolean>
171		194
172	When disabled (the default), then C<push_write> will try to immediately	195	When disabled (the default), then C<push_write> will try to immediately
173	write the data to the handle if possible. This avoids having to register	196	write the data to the handle, if possible. This avoids having to register
174	a write watcher and wait for the next event loop iteration, but can be	197	a write watcher and wait for the next event loop iteration, but can
175	inefficient if you write multiple small chunks (this disadvantage is	198	be inefficient if you write multiple small chunks (on the wire, this
176	usually avoided by your kernel's nagle algorithm, see C<low_delay>).	199	disadvantage is usually avoided by your kernel's nagle algorithm, see
		200	C<no_delay>, but this option can save costly syscalls).
177		201
178	When enabled, then writes will always be queued till the next event loop	202	When enabled, then writes will always be queued till the next event loop
179	iteration. This is efficient when you do many small writes per iteration,	203	iteration. This is efficient when you do many small writes per iteration,
180	but less efficient when you do a single write only.	204	but less efficient when you do a single write only per iteration (or when
		205	the write buffer often is full). It also increases write latency.
181		206
182	=item no_delay => <boolean>	207	=item no_delay => <boolean>
183		208
184	When doing small writes on sockets, your operating system kernel might	209	When doing small writes on sockets, your operating system kernel might
185	wait a bit for more data before actually sending it out. This is called	210	wait a bit for more data before actually sending it out. This is called
186	the Nagle algorithm, and usually it is beneficial.	211	the Nagle algorithm, and usually it is beneficial.
187		212
188	In some situations you want as low a delay as possible, which cna be	213	In some situations you want as low a delay as possible, which can be
189	accomplishd by setting this option to true.	214	accomplishd by setting this option to a true value.
190		215
191	The default is your opertaing system's default behaviour, this option	216	The default is your opertaing system's default behaviour (most likely
192	explicitly enables or disables it, if possible.	217	enabled), this option explicitly enables or disables it, if possible.
193		218
194	=item read_size => <bytes>	219	=item read_size => <bytes>
195		220
196	The default read block size (the amount of bytes this module will try to read	221	The default read block size (the amount of bytes this module will
197	during each (loop iteration). Default: C<8192>.	222	try to read during each loop iteration, which affects memory
		223	requirements). Default: C<8192>.
198		224
199	=item low_water_mark => <bytes>	225	=item low_water_mark => <bytes>
200		226
201	Sets the amount of bytes (default: C<0>) that make up an "empty" write	227	Sets the amount of bytes (default: C<0>) that make up an "empty" write
202	buffer: If the write reaches this size or gets even samller it is	228	buffer: If the write reaches this size or gets even samller it is
203	considered empty.	229	considered empty.
204		230
		231	Sometimes it can be beneficial (for performance reasons) to add data to
		232	the write buffer before it is fully drained, but this is a rare case, as
		233	the operating system kernel usually buffers data as well, so the default
		234	is good in almost all cases.
		235
205	=item linger => <seconds>	236	=item linger => <seconds>
206		237
207	If non-zero (default: C<3600>), then the destructor of the	238	If non-zero (default: C<3600>), then the destructor of the
208	AnyEvent::Handle object will check wether there is still outstanding write	239	AnyEvent::Handle object will check whether there is still outstanding
209	data and will install a watcher that will write out this data. No errors	240	write data and will install a watcher that will write this data to the
210	will be reported (this mostly matches how the operating system treats	241	socket. No errors will be reported (this mostly matches how the operating
211	outstanding data at socket close time).	242	system treats outstanding data at socket close time).
212		243
213	This will not work for partial TLS data that could not yet been	244	This will not work for partial TLS data that could not be encoded
214	encoded. This data will be lost.	245	yet. This data will be lost. Calling the C<stoptls> method in time might
		246	help.
		247
		248	=item peername => $string
		249
		250	A string used to identify the remote site - usually the DNS hostname
		251	(I<not> IDN!) used to create the connection, rarely the IP address.
		252
		253	Apart from being useful in error messages, this string is also used in TLS
		254	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		255	verification will be skipped when C<peername> is not specified or
		256	C<undef>.
215		257
216	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	258	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
217		259
218	When this parameter is given, it enables TLS (SSL) mode, that means it	260	When this parameter is given, it enables TLS (SSL) mode, that means
219	will start making tls handshake and will transparently encrypt/decrypt	261	AnyEvent will start a TLS handshake as soon as the conenction has been
220	data.	262	established and will transparently encrypt/decrypt data afterwards.
		263
		264	All TLS protocol errors will be signalled as C<EPROTO>, with an
		265	appropriate error message.
221		266
222	TLS mode requires Net::SSLeay to be installed (it will be loaded	267	TLS mode requires Net::SSLeay to be installed (it will be loaded
223	automatically when you try to create a TLS handle).	268	automatically when you try to create a TLS handle): this module doesn't
		269	have a dependency on that module, so if your module requires it, you have
		270	to add the dependency yourself.
224		271
225	For the TLS server side, use C<accept>, and for the TLS client side of a	272	Unlike TCP, TLS has a server and client side: for the TLS server side, use
226	connection, use C<connect> mode.	273	C<accept>, and for the TLS client side of a connection, use C<connect>
		274	mode.
227		275
228	You can also provide your own TLS connection object, but you have	276	You can also provide your own TLS connection object, but you have
229	to make sure that you call either C<Net::SSLeay::set_connect_state>	277	to make sure that you call either C<Net::SSLeay::set_connect_state>
230	or C<Net::SSLeay::set_accept_state> on it before you pass it to	278	or C<Net::SSLeay::set_accept_state> on it before you pass it to
231	AnyEvent::Handle.	279	AnyEvent::Handle. Also, this module will take ownership of this connection
		280	object.
232		281
		282	At some future point, AnyEvent::Handle might switch to another TLS
		283	implementation, then the option to use your own session object will go
		284	away.
		285
		286	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		287	passing in the wrong integer will lead to certain crash. This most often
		288	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		289	segmentation fault.
		290
233	See the C<starttls> method if you need to start TLS negotiation later.	291	See the C<< ->starttls >> method for when need to start TLS negotiation later.
234		292
235	=item tls_ctx => $ssl_ctx	293	=item tls_ctx => $anyevent_tls
236		294
237	Use the given Net::SSLeay::CTX object to create the new TLS connection	295	Use the given C<AnyEvent::TLS> object to create the new TLS connection
238	(unless a connection object was specified directly). If this parameter is	296	(unless a connection object was specified directly). If this parameter is
239	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	297	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
240		298
		299	Instead of an object, you can also specify a hash reference with C<< key
		300	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		301	new TLS context object.
		302
		303	=item on_starttls => $cb->($handle, $success[, $error_message])
		304
		305	This callback will be invoked when the TLS/SSL handshake has finished. If
		306	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		307	(C<on_stoptls> will not be called in this case).
		308
		309	The session in C<< $handle->{tls} >> can still be examined in this
		310	callback, even when the handshake was not successful.
		311
		312	TLS handshake failures will not cause C<on_error> to be invoked when this
		313	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		314
		315	Without this callback, handshake failures lead to C<on_error> being
		316	called, as normal.
		317
		318	Note that you cannot call C<starttls> right again in this callback. If you
		319	need to do that, start an zero-second timer instead whose callback can
		320	then call C<< ->starttls >> again.
		321
		322	=item on_stoptls => $cb->($handle)
		323
		324	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		325	set, then it will be invoked after freeing the TLS session. If it is not,
		326	then a TLS shutdown condition will be treated like a normal EOF condition
		327	on the handle.
		328
		329	The session in C<< $handle->{tls} >> can still be examined in this
		330	callback.
		331
		332	This callback will only be called on TLS shutdowns, not when the
		333	underlying handle signals EOF.
		334
241	=item json => JSON or JSON::XS object	335	=item json => JSON or JSON::XS object
242		336
243	This is the json coder object used by the C<json> read and write types.	337	This is the json coder object used by the C<json> read and write types.
244		338
245	If you don't supply it, then AnyEvent::Handle will create and use a	339	If you don't supply it, then AnyEvent::Handle will create and use a
246	suitable one, which will write and expect UTF-8 encoded JSON texts.	340	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		341	texts.
247		342
248	Note that you are responsible to depend on the JSON module if you want to	343	Note that you are responsible to depend on the JSON module if you want to
249	use this functionality, as AnyEvent does not have a dependency itself.	344	use this functionality, as AnyEvent does not have a dependency itself.
250		345
251	=item filter_r => $cb
252
253	=item filter_w => $cb
254
255	These exist, but are undocumented at this time.
256
257	=back	346	=back
258		347
259	=cut	348	=cut
260		349
261	sub new {	350	sub new {
262	my $class = shift;	351	my $class = shift;
263
264	my $self = bless { @_ }, $class;	352	my $self = bless { @_ }, $class;
265		353
266	$self->{fh} or Carp::croak "mandatory argument fh is missing";	354	$self->{fh} or Carp::croak "mandatory argument fh is missing";
267		355
268	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	356	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
269
270	if ($self->{tls}) {
271	require Net::SSLeay;
272	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
273	}
274		357
275	$self->{_activity} = AnyEvent->now;	358	$self->{_activity} = AnyEvent->now;
276	$self->_timeout;	359	$self->_timeout;
277		360
278	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
279	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};	361	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		362
		363	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		364	if $self->{tls};
		365
		366	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
280		367
281	$self->start_read	368	$self->start_read
282	if $self->{on_read};	369	if $self->{on_read};
283		370
284	$self	371	$self->{fh} && $self
285	}	372	}
286		373
287	sub _shutdown {	374	sub _shutdown {
288	my ($self) = @_;	375	my ($self) = @_;
289		376
290	delete $self->{_tw};	377	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
291	delete $self->{_rw};	378	$self->{_eof} = 1; # tell starttls et. al to stop trying
292	delete $self->{_ww};
293	delete $self->{fh};
294		379
295	$self->stoptls;	380	&_freetls;
296	}	381	}
297		382
298	sub _error {	383	sub _error {
299	my ($self, $errno, $fatal) = @_;	384	my ($self, $errno, $fatal, $message) = @_;
300		385
301	$self->_shutdown	386	$self->_shutdown
302	if $fatal;	387	if $fatal;
303		388
304	$! = $errno;	389	$! = $errno;
		390	$message \|\|= "$!";
305		391
306	if ($self->{on_error}) {	392	if ($self->{on_error}) {
307	$self->{on_error}($self, $fatal);	393	$self->{on_error}($self, $fatal, $message);
308	} else {	394	} elsif ($self->{fh}) {
309	Carp::croak "AnyEvent::Handle uncaught error: $!";	395	Carp::croak "AnyEvent::Handle uncaught error: $message";
310	}	396	}
311	}	397	}
312		398
313	=item $fh = $handle->fh	399	=item $fh = $handle->fh
314		400
315	This method returns the file handle of the L<AnyEvent::Handle> object.	401	This method returns the file handle used to create the L<AnyEvent::Handle> object.
316		402
317	=cut	403	=cut
318		404
319	sub fh { $_[0]{fh} }	405	sub fh { $_[0]{fh} }
320		406
…		…
338	$_[0]{on_eof} = $_[1];	424	$_[0]{on_eof} = $_[1];
339	}	425	}
340		426
341	=item $handle->on_timeout ($cb)	427	=item $handle->on_timeout ($cb)
342		428
343	Replace the current C<on_timeout> callback, or disables the callback	429	Replace the current C<on_timeout> callback, or disables the callback (but
344	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	430	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
345	argument.	431	argument and method.
346		432
347	=cut	433	=cut
348		434
349	sub on_timeout {	435	sub on_timeout {
350	$_[0]{on_timeout} = $_[1];	436	$_[0]{on_timeout} = $_[1];
351	}	437	}
352		438
353	=item $handle->autocork ($boolean)	439	=item $handle->autocork ($boolean)
354		440
355	Enables or disables the current autocork behaviour (see C<autocork>	441	Enables or disables the current autocork behaviour (see C<autocork>
356	constructor argument).	442	constructor argument). Changes will only take effect on the next write.
357		443
358	=cut	444	=cut
		445
		446	sub autocork {
		447	$_[0]{autocork} = $_[1];
		448	}
359		449
360	=item $handle->no_delay ($boolean)	450	=item $handle->no_delay ($boolean)
361		451
362	Enables or disables the C<no_delay> setting (see constructor argument of	452	Enables or disables the C<no_delay> setting (see constructor argument of
363	the same name for details).	453	the same name for details).
…		…
369		459
370	eval {	460	eval {
371	local $SIG{__DIE__};	461	local $SIG{__DIE__};
372	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	462	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
373	};	463	};
		464	}
		465
		466	=item $handle->on_starttls ($cb)
		467
		468	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		469
		470	=cut
		471
		472	sub on_starttls {
		473	$_[0]{on_starttls} = $_[1];
		474	}
		475
		476	=item $handle->on_stoptls ($cb)
		477
		478	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		479
		480	=cut
		481
		482	sub on_starttls {
		483	$_[0]{on_stoptls} = $_[1];
374	}	484	}
375		485
376	#############################################################################	486	#############################################################################
377		487
378	=item $handle->timeout ($seconds)	488	=item $handle->timeout ($seconds)
…		…
456	my ($self, $cb) = @_;	566	my ($self, $cb) = @_;
457		567
458	$self->{on_drain} = $cb;	568	$self->{on_drain} = $cb;
459		569
460	$cb->($self)	570	$cb->($self)
461	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	571	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
462	}	572	}
463		573
464	=item $handle->push_write ($data)	574	=item $handle->push_write ($data)
465		575
466	Queues the given scalar to be written. You can push as much data as you	576	Queues the given scalar to be written. You can push as much data as you
…		…
477	Scalar::Util::weaken $self;	587	Scalar::Util::weaken $self;
478		588
479	my $cb = sub {	589	my $cb = sub {
480	my $len = syswrite $self->{fh}, $self->{wbuf};	590	my $len = syswrite $self->{fh}, $self->{wbuf};
481		591
482	if ($len >= 0) {	592	if (defined $len) {
483	substr $self->{wbuf}, 0, $len, "";	593	substr $self->{wbuf}, 0, $len, "";
484		594
485	$self->{_activity} = AnyEvent->now;	595	$self->{_activity} = AnyEvent->now;
486		596
487	$self->{on_drain}($self)	597	$self->{on_drain}($self)
488	if $self->{low_water_mark} >= length $self->{wbuf}	598	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
489	&& $self->{on_drain};	599	&& $self->{on_drain};
490		600
491	delete $self->{_ww} unless length $self->{wbuf};	601	delete $self->{_ww} unless length $self->{wbuf};
492	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	602	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
493	$self->_error ($!, 1);	603	$self->_error ($!, 1);
…		…
517		627
518	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	628	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
519	->($self, @_);	629	->($self, @_);
520	}	630	}
521		631
522	if ($self->{filter_w}) {	632	if ($self->{tls}) {
523	$self->{filter_w}($self, \$_[0]);	633	$self->{_tls_wbuf} .= $_[0];
		634
		635	&_dotls ($self);
524	} else {	636	} else {
525	$self->{wbuf} .= $_[0];	637	$self->{wbuf} .= $_[0];
526	$self->_drain_wbuf;	638	$self->_drain_wbuf;
527	}	639	}
528	}	640	}
…		…
545	=cut	657	=cut
546		658
547	register_write_type netstring => sub {	659	register_write_type netstring => sub {
548	my ($self, $string) = @_;	660	my ($self, $string) = @_;
549		661
550	sprintf "%d:%s,", (length $string), $string	662	(length $string) . ":$string,"
551	};	663	};
552		664
553	=item packstring => $format, $data	665	=item packstring => $format, $data
554		666
555	An octet string prefixed with an encoded length. The encoding C<$format>	667	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
620		732
621	pack "w/a*", Storable::nfreeze ($ref)	733	pack "w/a*", Storable::nfreeze ($ref)
622	};	734	};
623		735
624	=back	736	=back
		737
		738	=item $handle->push_shutdown
		739
		740	Sometimes you know you want to close the socket after writing your data
		741	before it was actually written. One way to do that is to replace your
		742	C<on_drain> handler by a callback that shuts down the socket (and set
		743	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		744	replaces the C<on_drain> callback with:
		745
		746	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		747
		748	This simply shuts down the write side and signals an EOF condition to the
		749	the peer.
		750
		751	You can rely on the normal read queue and C<on_eof> handling
		752	afterwards. This is the cleanest way to close a connection.
		753
		754	=cut
		755
		756	sub push_shutdown {
		757	my ($self) = @_;
		758
		759	delete $self->{low_water_mark};
		760	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		761	}
625		762
626	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	763	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
627		764
628	This function (not method) lets you add your own types to C<push_write>.	765	This function (not method) lets you add your own types to C<push_write>.
629	Whenever the given C<type> is used, C<push_write> will invoke the code	766	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
729		866
730	if (	867	if (
731	defined $self->{rbuf_max}	868	defined $self->{rbuf_max}
732	&& $self->{rbuf_max} < length $self->{rbuf}	869	&& $self->{rbuf_max} < length $self->{rbuf}
733	) {	870	) {
734	return $self->_error (&Errno::ENOSPC, 1);	871	$self->_error (&Errno::ENOSPC, 1), return;
735	}	872	}
736		873
737	while () {	874	while () {
		875	# we need to use a separate tls read buffer, as we must not receive data while
		876	# we are draining the buffer, and this can only happen with TLS.
		877	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
		878
738	my $len = length $self->{rbuf};	879	my $len = length $self->{rbuf};
739		880
740	if (my $cb = shift @{ $self->{_queue} }) {	881	if (my $cb = shift @{ $self->{_queue} }) {
741	unless ($cb->($self)) {	882	unless ($cb->($self)) {
742	if ($self->{_eof}) {	883	if ($self->{_eof}) {
743	# no progress can be made (not enough data and no data forthcoming)	884	# no progress can be made (not enough data and no data forthcoming)
744	$self->_error (&Errno::EPIPE, 1), last;	885	$self->_error (&Errno::EPIPE, 1), return;
745	}	886	}
746		887
747	unshift @{ $self->{_queue} }, $cb;	888	unshift @{ $self->{_queue} }, $cb;
748	last;	889	last;
749	}	890	}
…		…
757	&& !@{ $self->{_queue} } # and the queue is still empty	898	&& !@{ $self->{_queue} } # and the queue is still empty
758	&& $self->{on_read} # but we still have on_read	899	&& $self->{on_read} # but we still have on_read
759	) {	900	) {
760	# no further data will arrive	901	# no further data will arrive
761	# so no progress can be made	902	# so no progress can be made
762	$self->_error (&Errno::EPIPE, 1), last	903	$self->_error (&Errno::EPIPE, 1), return
763	if $self->{_eof};	904	if $self->{_eof};
764		905
765	last; # more data might arrive	906	last; # more data might arrive
766	}	907	}
767	} else {	908	} else {
768	# read side becomes idle	909	# read side becomes idle
769	delete $self->{_rw};	910	delete $self->{_rw} unless $self->{tls};
770	last;	911	last;
771	}	912	}
772	}	913	}
773		914
774	if ($self->{_eof}) {	915	if ($self->{_eof}) {
775	if ($self->{on_eof}) {	916	if ($self->{on_eof}) {
776	$self->{on_eof}($self)	917	$self->{on_eof}($self)
777	} else {	918	} else {
778	$self->_error (0, 1);	919	$self->_error (0, 1, "Unexpected end-of-file");
779	}	920	}
780	}	921	}
781		922
782	# may need to restart read watcher	923	# may need to restart read watcher
783	unless ($self->{_rw}) {	924	unless ($self->{_rw}) {
…		…
803		944
804	=item $handle->rbuf	945	=item $handle->rbuf
805		946
806	Returns the read buffer (as a modifiable lvalue).	947	Returns the read buffer (as a modifiable lvalue).
807		948
808	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	949	You can access the read buffer directly as the C<< ->{rbuf} >>
809	you want.	950	member, if you want. However, the only operation allowed on the
		951	read buffer (apart from looking at it) is removing data from its
		952	beginning. Otherwise modifying or appending to it is not allowed and will
		953	lead to hard-to-track-down bugs.
810		954
811	NOTE: The read buffer should only be used or modified if the C<on_read>,	955	NOTE: The read buffer should only be used or modified if the C<on_read>,
812	C<push_read> or C<unshift_read> methods are used. The other read methods	956	C<push_read> or C<unshift_read> methods are used. The other read methods
813	automatically manage the read buffer.	957	automatically manage the read buffer.
814		958
…		…
1069	An octet string prefixed with an encoded length. The encoding C<$format>	1213	An octet string prefixed with an encoded length. The encoding C<$format>
1070	uses the same format as a Perl C<pack> format, but must specify a single	1214	uses the same format as a Perl C<pack> format, but must specify a single
1071	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1215	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1072	optional C<!>, C<< < >> or C<< > >> modifier).	1216	optional C<!>, C<< < >> or C<< > >> modifier).
1073		1217
1074	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1218	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1219	EPP uses a prefix of C<N> (4 octtes).
1075		1220
1076	Example: read a block of data prefixed by its length in BER-encoded	1221	Example: read a block of data prefixed by its length in BER-encoded
1077	format (very efficient).	1222	format (very efficient).
1078		1223
1079	$handle->push_read (packstring => "w", sub {	1224	$handle->push_read (packstring => "w", sub {
…		…
1109	}	1254	}
1110	};	1255	};
1111		1256
1112	=item json => $cb->($handle, $hash_or_arrayref)	1257	=item json => $cb->($handle, $hash_or_arrayref)
1113		1258
1114	Reads a JSON object or array, decodes it and passes it to the callback.	1259	Reads a JSON object or array, decodes it and passes it to the
		1260	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1115		1261
1116	If a C<json> object was passed to the constructor, then that will be used	1262	If a C<json> object was passed to the constructor, then that will be used
1117	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1263	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1118		1264
1119	This read type uses the incremental parser available with JSON version	1265	This read type uses the incremental parser available with JSON version
…		…
1128	=cut	1274	=cut
1129		1275
1130	register_read_type json => sub {	1276	register_read_type json => sub {
1131	my ($self, $cb) = @_;	1277	my ($self, $cb) = @_;
1132		1278
1133	require JSON;	1279	my $json = $self->{json} \|\|=
		1280	eval { require JSON::XS; JSON::XS->new->utf8 }
		1281	\|\| do { require JSON; JSON->new->utf8 };
1134		1282
1135	my $data;	1283	my $data;
1136	my $rbuf = \$self->{rbuf};	1284	my $rbuf = \$self->{rbuf};
1137		1285
1138	my $json = $self->{json} \|\|= JSON->new->utf8;
1139
1140	sub {	1286	sub {
1141	my $ref = $json->incr_parse ($self->{rbuf});	1287	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1142		1288
1143	if ($ref) {	1289	if ($ref) {
1144	$self->{rbuf} = $json->incr_text;	1290	$self->{rbuf} = $json->incr_text;
1145	$json->incr_text = "";	1291	$json->incr_text = "";
1146	$cb->($self, $ref);	1292	$cb->($self, $ref);
1147		1293
1148	1	1294	1
		1295	} elsif ($@) {
		1296	# error case
		1297	$json->incr_skip;
		1298
		1299	$self->{rbuf} = $json->incr_text;
		1300	$json->incr_text = "";
		1301
		1302	$self->_error (&Errno::EBADMSG);
		1303
		1304	()
1149	} else {	1305	} else {
1150	$self->{rbuf} = "";	1306	$self->{rbuf} = "";
		1307
1151	()	1308	()
1152	}	1309	}
1153	}	1310	}
1154	};	1311	};
1155		1312
…		…
1232	Note that AnyEvent::Handle will automatically C<start_read> for you when	1389	Note that AnyEvent::Handle will automatically C<start_read> for you when
1233	you change the C<on_read> callback or push/unshift a read callback, and it	1390	you change the C<on_read> callback or push/unshift a read callback, and it
1234	will automatically C<stop_read> for you when neither C<on_read> is set nor	1391	will automatically C<stop_read> for you when neither C<on_read> is set nor
1235	there are any read requests in the queue.	1392	there are any read requests in the queue.
1236		1393
		1394	These methods will have no effect when in TLS mode (as TLS doesn't support
		1395	half-duplex connections).
		1396
1237	=cut	1397	=cut
1238		1398
1239	sub stop_read {	1399	sub stop_read {
1240	my ($self) = @_;	1400	my ($self) = @_;
1241		1401
1242	delete $self->{_rw};	1402	delete $self->{_rw} unless $self->{tls};
1243	}	1403	}
1244		1404
1245	sub start_read {	1405	sub start_read {
1246	my ($self) = @_;	1406	my ($self) = @_;
1247		1407
1248	unless ($self->{_rw} \|\| $self->{_eof}) {	1408	unless ($self->{_rw} \|\| $self->{_eof}) {
1249	Scalar::Util::weaken $self;	1409	Scalar::Util::weaken $self;
1250		1410
1251	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1411	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1252	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1412	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1253	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1413	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1254		1414
1255	if ($len > 0) {	1415	if ($len > 0) {
1256	$self->{_activity} = AnyEvent->now;	1416	$self->{_activity} = AnyEvent->now;
1257		1417
1258	$self->{filter_r}	1418	if ($self->{tls}) {
1259	? $self->{filter_r}($self, $rbuf)	1419	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1260	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1420
		1421	&_dotls ($self);
		1422	} else {
		1423	$self->_drain_rbuf unless $self->{_in_drain};
		1424	}
1261		1425
1262	} elsif (defined $len) {	1426	} elsif (defined $len) {
1263	delete $self->{_rw};	1427	delete $self->{_rw};
1264	$self->{_eof} = 1;	1428	$self->{_eof} = 1;
1265	$self->_drain_rbuf unless $self->{_in_drain};	1429	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1269	}	1433	}
1270	});	1434	});
1271	}	1435	}
1272	}	1436	}
1273		1437
		1438	our $ERROR_SYSCALL;
		1439	our $ERROR_WANT_READ;
		1440
		1441	sub _tls_error {
		1442	my ($self, $err) = @_;
		1443
		1444	return $self->_error ($!, 1)
		1445	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1446
		1447	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1448
		1449	# reduce error string to look less scary
		1450	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1451
		1452	if ($self->{_on_starttls}) {
		1453	(delete $self->{_on_starttls})->($self, undef, $err);
		1454	&_freetls;
		1455	} else {
		1456	&_freetls;
		1457	$self->_error (&Errno::EPROTO, 1, $err);
		1458	}
		1459	}
		1460
		1461	# poll the write BIO and send the data if applicable
		1462	# also decode read data if possible
		1463	# this is basiclaly our TLS state machine
		1464	# more efficient implementations are possible with openssl,
		1465	# but not with the buggy and incomplete Net::SSLeay.
1274	sub _dotls {	1466	sub _dotls {
1275	my ($self) = @_;	1467	my ($self) = @_;
1276		1468
1277	my $buf;	1469	my $tmp;
1278		1470
1279	if (length $self->{_tls_wbuf}) {	1471	if (length $self->{_tls_wbuf}) {
1280	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1472	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1281	substr $self->{_tls_wbuf}, 0, $len, "";	1473	substr $self->{_tls_wbuf}, 0, $tmp, "";
1282	}	1474	}
1283	}
1284		1475
		1476	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1477	return $self->_tls_error ($tmp)
		1478	if $tmp != $ERROR_WANT_READ
		1479	&& ($tmp != $ERROR_SYSCALL \|\| $!);
		1480	}
		1481
		1482	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1483	unless (length $tmp) {
		1484	$self->{_on_starttls}
		1485	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1486	&_freetls;
		1487
		1488	if ($self->{on_stoptls}) {
		1489	$self->{on_stoptls}($self);
		1490	return;
		1491	} else {
		1492	# let's treat SSL-eof as we treat normal EOF
		1493	delete $self->{_rw};
		1494	$self->{_eof} = 1;
		1495	}
		1496	}
		1497
		1498	$self->{_tls_rbuf} .= $tmp;
		1499	$self->_drain_rbuf unless $self->{_in_drain};
		1500	$self->{tls} or return; # tls session might have gone away in callback
		1501	}
		1502
		1503	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1504	return $self->_tls_error ($tmp)
		1505	if $tmp != $ERROR_WANT_READ
		1506	&& ($tmp != $ERROR_SYSCALL \|\| $!);
		1507
1285	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1508	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1286	$self->{wbuf} .= $buf;	1509	$self->{wbuf} .= $tmp;
1287	$self->_drain_wbuf;	1510	$self->_drain_wbuf;
1288	}	1511	}
1289		1512
1290	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1513	$self->{_on_starttls}
1291	if (length $buf) {	1514	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1292	$self->{rbuf} .= $buf;	1515	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1293	$self->_drain_rbuf unless $self->{_in_drain};
1294	} else {
1295	# let's treat SSL-eof as we treat normal EOF
1296	$self->{_eof} = 1;
1297	$self->_shutdown;
1298	return;
1299	}
1300	}
1301
1302	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1303
1304	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1305	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1306	return $self->_error ($!, 1);
1307	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1308	return $self->_error (&Errno::EIO, 1);
1309	}
1310
1311	# all others are fine for our purposes
1312	}
1313	}	1516	}
1314		1517
1315	=item $handle->starttls ($tls[, $tls_ctx])	1518	=item $handle->starttls ($tls[, $tls_ctx])
1316		1519
1317	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1520	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
…		…
1319	C<starttls>.	1522	C<starttls>.
1320		1523
1321	The first argument is the same as the C<tls> constructor argument (either	1524	The first argument is the same as the C<tls> constructor argument (either
1322	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1525	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1323		1526
1324	The second argument is the optional C<Net::SSLeay::CTX> object that is	1527	The second argument is the optional C<AnyEvent::TLS> object that is used
1325	used when AnyEvent::Handle has to create its own TLS connection object.	1528	when AnyEvent::Handle has to create its own TLS connection object, or
		1529	a hash reference with C<< key => value >> pairs that will be used to
		1530	construct a new context.
1326		1531
1327	The TLS connection object will end up in C<< $handle->{tls} >> after this	1532	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1328	call and can be used or changed to your liking. Note that the handshake	1533	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1329	might have already started when this function returns.	1534	changed to your liking. Note that the handshake might have already started
		1535	when this function returns.
1330		1536
		1537	If it an error to start a TLS handshake more than once per
		1538	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1539
1331	=cut	1540	=cut
		1541
		1542	our %TLS_CACHE; #TODO not yet documented, should we?
1332		1543
1333	sub starttls {	1544	sub starttls {
1334	my ($self, $ssl, $ctx) = @_;	1545	my ($self, $ssl, $ctx) = @_;
1335		1546
1336	$self->stoptls;	1547	require Net::SSLeay;
1337		1548
1338	if ($ssl eq "accept") {	1549	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1339	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1550	if $self->{tls};
1340	Net::SSLeay::set_accept_state ($ssl);	1551
1341	} elsif ($ssl eq "connect") {	1552	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1342	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1553	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1343	Net::SSLeay::set_connect_state ($ssl);	1554
		1555	$ctx \|\|= $self->{tls_ctx};
		1556
		1557	if ("HASH" eq ref $ctx) {
		1558	require AnyEvent::TLS;
		1559
		1560	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context
		1561
		1562	if ($ctx->{cache}) {
		1563	my $key = $ctx+0;
		1564	$ctx = $TLS_CACHE{$key} \|\|= new AnyEvent::TLS %$ctx;
		1565	} else {
		1566	$ctx = new AnyEvent::TLS %$ctx;
		1567	}
		1568	}
1344	}	1569
1345		1570	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1346	$self->{tls} = $ssl;	1571	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});
1347		1572
1348	# basically, this is deep magic (because SSL_read should have the same issues)	1573	# basically, this is deep magic (because SSL_read should have the same issues)
1349	# but the openssl maintainers basically said: "trust us, it just works".	1574	# but the openssl maintainers basically said: "trust us, it just works".
1350	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1575	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1351	# and mismaintained ssleay-module doesn't even offer them).	1576	# and mismaintained ssleay-module doesn't even offer them).
1352	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1577	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1578	#
		1579	# in short: this is a mess.
		1580	#
		1581	# note that we do not try to keep the length constant between writes as we are required to do.
		1582	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1583	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1584	# have identity issues in that area.
1353	Net::SSLeay::CTX_set_mode ($self->{tls},	1585	# Net::SSLeay::CTX_set_mode ($ssl,
1354	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1586	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1355	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1587	# \| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1588	Net::SSLeay::CTX_set_mode ($ssl, 1\|2);
1356		1589
1357	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1590	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1358	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1591	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1359		1592
1360	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1593	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1361		1594
1362	$self->{filter_w} = sub {	1595	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1363	$_[0]{_tls_wbuf} .= ${$_[1]};	1596	if $self->{on_starttls};
1364	&_dotls;	1597
1365	};	1598	&_dotls; # need to trigger the initial handshake
1366	$self->{filter_r} = sub {	1599	$self->start_read; # make sure we actually do read
1367	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1368	&_dotls;
1369	};
1370	}	1600	}
1371		1601
1372	=item $handle->stoptls	1602	=item $handle->stoptls
1373		1603
1374	Destroys the SSL connection, if any. Partial read or write data will be	1604	Shuts down the SSL connection - this makes a proper EOF handshake by
1375	lost.	1605	sending a close notify to the other side, but since OpenSSL doesn't
		1606	support non-blocking shut downs, it is not possible to re-use the stream
		1607	afterwards.
1376		1608
1377	=cut	1609	=cut
1378		1610
1379	sub stoptls {	1611	sub stoptls {
1380	my ($self) = @_;	1612	my ($self) = @_;
1381		1613
1382	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1614	if ($self->{tls}) {
		1615	Net::SSLeay::shutdown ($self->{tls});
1383		1616
1384	delete $self->{_rbio};	1617	&_dotls;
1385	delete $self->{_wbio};	1618
1386	delete $self->{_tls_wbuf};	1619	# # we don't give a shit. no, we do, but we can't. no...#d#
1387	delete $self->{filter_r};	1620	# # we, we... have to use openssl :/#d#
1388	delete $self->{filter_w};	1621	# &_freetls;#d#
		1622	}
		1623	}
		1624
		1625	sub _freetls {
		1626	my ($self) = @_;
		1627
		1628	return unless $self->{tls};
		1629
		1630	$self->{tls_ctx}->_put_session (delete $self->{tls});
		1631
		1632	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1389	}	1633	}
1390		1634
1391	sub DESTROY {	1635	sub DESTROY {
1392	my $self = shift;	1636	my ($self) = @_;
1393		1637
1394	$self->stoptls;	1638	&_freetls;
1395		1639
1396	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1640	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1397		1641
1398	if ($linger && length $self->{wbuf}) {	1642	if ($linger && length $self->{wbuf}) {
1399	my $fh = delete $self->{fh};	1643	my $fh = delete $self->{fh};
…		…
1414	@linger = ();	1658	@linger = ();
1415	});	1659	});
1416	}	1660	}
1417	}	1661	}
1418		1662
		1663	=item $handle->destroy
		1664
		1665	Shuts down the handle object as much as possible - this call ensures that
		1666	no further callbacks will be invoked and as many resources as possible
		1667	will be freed. You must not call any methods on the object afterwards.
		1668
		1669	Normally, you can just "forget" any references to an AnyEvent::Handle
		1670	object and it will simply shut down. This works in fatal error and EOF
		1671	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1672	callback, so when you want to destroy the AnyEvent::Handle object from
		1673	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1674	that case.
		1675
		1676	The handle might still linger in the background and write out remaining
		1677	data, as specified by the C<linger> option, however.
		1678
		1679	=cut
		1680
		1681	sub destroy {
		1682	my ($self) = @_;
		1683
		1684	$self->DESTROY;
		1685	%$self = ();
		1686	}
		1687
1419	=item AnyEvent::Handle::TLS_CTX	1688	=item AnyEvent::Handle::TLS_CTX
1420		1689
1421	This function creates and returns the Net::SSLeay::CTX object used by	1690	This function creates and returns the AnyEvent::TLS object used by default
1422	default for TLS mode.	1691	for TLS mode.
1423		1692
1424	The context is created like this:	1693	The context is created by calling L<AnyEvent::TLS> without any arguments.
1425
1426	Net::SSLeay::load_error_strings;
1427	Net::SSLeay::SSLeay_add_ssl_algorithms;
1428	Net::SSLeay::randomize;
1429
1430	my $CTX = Net::SSLeay::CTX_new;
1431
1432	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1433		1694
1434	=cut	1695	=cut
1435		1696
1436	our $TLS_CTX;	1697	our $TLS_CTX;
1437		1698
1438	sub TLS_CTX() {	1699	sub TLS_CTX() {
1439	$TLS_CTX \|\| do {	1700	$TLS_CTX \|\|= do {
1440	require Net::SSLeay;	1701	require AnyEvent::TLS;
1441		1702
1442	Net::SSLeay::load_error_strings ();	1703	new AnyEvent::TLS
1443	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1444	Net::SSLeay::randomize ();
1445
1446	$TLS_CTX = Net::SSLeay::CTX_new ();
1447
1448	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1449
1450	$TLS_CTX
1451	}	1704	}
1452	}	1705	}
1453		1706
1454	=back	1707	=back
		1708
		1709
		1710	=head1 NONFREQUENTLY ASKED QUESTIONS
		1711
		1712	=over 4
		1713
		1714	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1715	still get further invocations!
		1716
		1717	That's because AnyEvent::Handle keeps a reference to itself when handling
		1718	read or write callbacks.
		1719
		1720	It is only safe to "forget" the reference inside EOF or error callbacks,
		1721	from within all other callbacks, you need to explicitly call the C<<
		1722	->destroy >> method.
		1723
		1724	=item I get different callback invocations in TLS mode/Why can't I pause
		1725	reading?
		1726
		1727	Unlike, say, TCP, TLS connections do not consist of two independent
		1728	communication channels, one for each direction. Or put differently. The
		1729	read and write directions are not independent of each other: you cannot
		1730	write data unless you are also prepared to read, and vice versa.
		1731
		1732	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1733	callback invocations when you are not expecting any read data - the reason
		1734	is that AnyEvent::Handle always reads in TLS mode.
		1735
		1736	During the connection, you have to make sure that you always have a
		1737	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1738	connection (or when you no longer want to use it) you can call the
		1739	C<destroy> method.
		1740
		1741	=item How do I read data until the other side closes the connection?
		1742
		1743	If you just want to read your data into a perl scalar, the easiest way
		1744	to achieve this is by setting an C<on_read> callback that does nothing,
		1745	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1746	will be in C<$_[0]{rbuf}>:
		1747
		1748	$handle->on_read (sub { });
		1749	$handle->on_eof (undef);
		1750	$handle->on_error (sub {
		1751	my $data = delete $_[0]{rbuf};
		1752	undef $handle;
		1753	});
		1754
		1755	The reason to use C<on_error> is that TCP connections, due to latencies
		1756	and packets loss, might get closed quite violently with an error, when in
		1757	fact, all data has been received.
		1758
		1759	It is usually better to use acknowledgements when transferring data,
		1760	to make sure the other side hasn't just died and you got the data
		1761	intact. This is also one reason why so many internet protocols have an
		1762	explicit QUIT command.
		1763
		1764	=item I don't want to destroy the handle too early - how do I wait until
		1765	all data has been written?
		1766
		1767	After writing your last bits of data, set the C<on_drain> callback
		1768	and destroy the handle in there - with the default setting of
		1769	C<low_water_mark> this will be called precisely when all data has been
		1770	written to the socket:
		1771
		1772	$handle->push_write (...);
		1773	$handle->on_drain (sub {
		1774	warn "all data submitted to the kernel\n";
		1775	undef $handle;
		1776	});
		1777
		1778	If you just want to queue some data and then signal EOF to the other side,
		1779	consider using C<< ->push_shutdown >> instead.
		1780
		1781	=item I want to contact a TLS/SSL server, I don't care about security.
		1782
		1783	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1784	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1785	parameter:
		1786
		1787	tcp_connect $host, $port, sub {
		1788	my ($fh) = @_;
		1789
		1790	my $handle = new AnyEvent::Handle
		1791	fh => $fh,
		1792	tls => "connect",
		1793	on_error => sub { ... };
		1794
		1795	$handle->push_write (...);
		1796	};
		1797
		1798	=item I want to contact a TLS/SSL server, I do care about security.
		1799
		1800	Then you should additionally enable certificate verification, including
		1801	peername verification, if the protocol you use supports it (see
		1802	L<AnyEvent::TLS>, C<verify_peername>).
		1803
		1804	E.g. for HTTPS:
		1805
		1806	tcp_connect $host, $port, sub {
		1807	my ($fh) = @_;
		1808
		1809	my $handle = new AnyEvent::Handle
		1810	fh => $fh,
		1811	peername => $host,
		1812	tls => "connect",
		1813	tls_ctx => { verify => 1, verify_peername => "https" },
		1814	...
		1815
		1816	Note that you must specify the hostname you connected to (or whatever
		1817	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1818	peername verification will be done.
		1819
		1820	The above will use the system-dependent default set of trusted CA
		1821	certificates. If you want to check against a specific CA, add the
		1822	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1823
		1824	tls_ctx => {
		1825	verify => 1,
		1826	verify_peername => "https",
		1827	ca_file => "my-ca-cert.pem",
		1828	},
		1829
		1830	=item I want to create a TLS/SSL server, how do I do that?
		1831
		1832	Well, you first need to get a server certificate and key. You have
		1833	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1834	self-signed certificate (cheap. check the search engine of your choice,
		1835	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1836	nice program for that purpose).
		1837
		1838	Then create a file with your private key (in PEM format, see
		1839	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1840	file should then look like this:
		1841
		1842	-----BEGIN RSA PRIVATE KEY-----
		1843	...header data
		1844	... lots of base64'y-stuff
		1845	-----END RSA PRIVATE KEY-----
		1846
		1847	-----BEGIN CERTIFICATE-----
		1848	... lots of base64'y-stuff
		1849	-----END CERTIFICATE-----
		1850
		1851	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		1852	specify this file as C<cert_file>:
		1853
		1854	tcp_server undef, $port, sub {
		1855	my ($fh) = @_;
		1856
		1857	my $handle = new AnyEvent::Handle
		1858	fh => $fh,
		1859	tls => "accept",
		1860	tls_ctx => { cert_file => "my-server-keycert.pem" },
		1861	...
		1862
		1863	When you have intermediate CA certificates that your clients might not
		1864	know about, just append them to the C<cert_file>.
		1865
		1866	=back
		1867
1455		1868
1456	=head1 SUBCLASSING AnyEvent::Handle	1869	=head1 SUBCLASSING AnyEvent::Handle
1457		1870
1458	In many cases, you might want to subclass AnyEvent::Handle.	1871	In many cases, you might want to subclass AnyEvent::Handle.
1459		1872

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC vs. Revision 1.148 by root, Fri Jul 10 22:35:28 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.80 by root, Sun Jul 27 08:43:32 2008 UTC vs.
Revision 1.148 by root, Fri Jul 10 22:35:28 2009 UTC