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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.83 by root, Thu Aug 21 19:11:37 2008 UTC vs.
Revision 1.149 by root, Thu Jul 16 03:48:33 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 = 4.232;	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;
25		25
26	my $cv = AnyEvent->condvar;	26	my $cv = AnyEvent->condvar;
27		27
28	my $handle =	28	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	29	fh => \*STDIN,
31	on_eof => sub {	30	on_error => sub {
32	$cv->broadcast;	31	warn "got error $_[2]\n";
33	},	32	$cv->send;
34	);	33	);
35		34
36	# send some request line	35	# send some request line
37	$handle->push_write ("getinfo\015\012");	36	$hdl->push_write ("getinfo\015\012");
38		37
39	# read the response line	38	# read the response line
40	$handle->push_read (line => sub {	39	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	40	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	41	warn "got line <$line>\n";
43	$cv->send;	42	$cv->send;
44	});	43	});
45		44
46	$cv->recv;	45	$cv->recv;
47		46
…		…
49		48
50	This module is a helper module to make it easier to do event-based I/O on	49	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	50	filehandles. For utility functions for doing non-blocking connects and accepts
52	on sockets see L<AnyEvent::Util>.	51	on sockets see L<AnyEvent::Util>.
53		52
		53	The L<AnyEvent::Intro> tutorial contains some well-documented
		54	AnyEvent::Handle examples.
		55
54	In the following, when the documentation refers to of "bytes" then this	56	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	57	means characters. As sysread and syswrite are used for all I/O, their
56	treatment of characters applies to this module as well.	58	treatment of characters applies to this module as well.
57		59
58	All callbacks will be invoked with the handle object as their first	60	All callbacks will be invoked with the handle object as their first
…		…
60		62
61	=head1 METHODS	63	=head1 METHODS
62		64
63	=over 4	65	=over 4
64		66
65	=item B<new (%args)>	67	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
66		68
67	The constructor supports these arguments (all as key => value pairs).	69	The constructor supports these arguments (all as C<< key => value >> pairs).
68		70
69	=over 4	71	=over 4
70		72
71	=item fh => $filehandle [MANDATORY]	73	=item fh => $filehandle [MANDATORY]
72		74
…		…
81	Set the callback to be called when an end-of-file condition is detected,	83	Set the callback to be called when an end-of-file condition is detected,
82	i.e. in the case of a socket, when the other side has closed the	84	i.e. in the case of a socket, when the other side has closed the
83	connection cleanly.	85	connection cleanly.
84		86
85	For sockets, this just means that the other side has stopped sending data,	87	For sockets, this just means that the other side has stopped sending data,
86	you can still try to write data, and, in fact, one can return from the eof	88	you can still try to write data, and, in fact, one can return from the EOF
87	callback and continue writing data, as only the read part has been shut	89	callback and continue writing data, as only the read part has been shut
88	down.	90	down.
89		91
90	While not mandatory, it is I<highly> recommended to set an eof callback,	92	While not mandatory, it is I<highly> recommended to set an EOF callback,
91	otherwise you might end up with a closed socket while you are still	93	otherwise you might end up with a closed socket while you are still
92	waiting for data.	94	waiting for data.
93		95
94	If an EOF condition has been detected but no C<on_eof> callback has been	96	If an EOF condition has been detected but no C<on_eof> callback has been
95	set, then a fatal error will be raised with C<$!> set to <0>.	97	set, then a fatal error will be raised with C<$!> set to <0>.
96		98
97	=item on_error => $cb->($handle, $fatal)	99	=item on_error => $cb->($handle, $fatal, $message)
98		100
99	This is the error callback, which is called when, well, some error	101	This is the error callback, which is called when, well, some error
100	occured, such as not being able to resolve the hostname, failure to	102	occured, such as not being able to resolve the hostname, failure to
101	connect or a read error.	103	connect or a read error.
102		104
103	Some errors are fatal (which is indicated by C<$fatal> being true). On	105	Some errors are fatal (which is indicated by C<$fatal> being true). On
104	fatal errors the handle object will be shut down and will not be usable	106	fatal errors the handle object will be destroyed (by a call to C<< ->
105	(but you are free to look at the current C< ->rbuf >). Examples of fatal	107	destroy >>) after invoking the error callback (which means you are free to
106	errors are an EOF condition with active (but unsatisifable) read watchers	108	examine the handle object). Examples of fatal errors are an EOF condition
107	(C<EPIPE>) or I/O errors.	109	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors.
		110
		111	AnyEvent::Handle tries to find an appropriate error code for you to check
		112	against, but in some cases (TLS errors), this does not work well. It is
		113	recommended to always output the C<$message> argument in human-readable
		114	error messages (it's usually the same as C<"$!">).
108		115
109	Non-fatal errors can be retried by simply returning, but it is recommended	116	Non-fatal errors can be retried by simply returning, but it is recommended
110	to simply ignore this parameter and instead abondon the handle object	117	to simply ignore this parameter and instead abondon the handle object
111	when this callback is invoked. Examples of non-fatal errors are timeouts	118	when this callback is invoked. Examples of non-fatal errors are timeouts
112	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	119	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
113		120
114	On callback entrance, the value of C<$!> contains the operating system	121	On callback entrance, the value of C<$!> contains the operating system
115	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	122	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		123	C<EPROTO>).
116		124
117	While not mandatory, it is I<highly> recommended to set this callback, as	125	While not mandatory, it is I<highly> recommended to set this callback, as
118	you will not be notified of errors otherwise. The default simply calls	126	you will not be notified of errors otherwise. The default simply calls
119	C<croak>.	127	C<croak>.
120		128
…		…
124	and no read request is in the queue (unlike read queue callbacks, this	132	and no read request is in the queue (unlike read queue callbacks, this
125	callback will only be called when at least one octet of data is in the	133	callback will only be called when at least one octet of data is in the
126	read buffer).	134	read buffer).
127		135
128	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	136	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
129	method or access the C<$handle->{rbuf}> member directly.	137	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		138	must not enlarge or modify the read buffer, you can only remove data at
		139	the beginning from it.
130		140
131	When an EOF condition is detected then AnyEvent::Handle will first try to	141	When an EOF condition is detected then AnyEvent::Handle will first try to
132	feed all the remaining data to the queued callbacks and C<on_read> before	142	feed all the remaining data to the queued callbacks and C<on_read> before
133	calling the C<on_eof> callback. If no progress can be made, then a fatal	143	calling the C<on_eof> callback. If no progress can be made, then a fatal
134	error will be raised (with C<$!> set to C<EPIPE>).	144	error will be raised (with C<$!> set to C<EPIPE>).
…		…
149	=item timeout => $fractional_seconds	159	=item timeout => $fractional_seconds
150		160
151	If non-zero, then this enables an "inactivity" timeout: whenever this many	161	If non-zero, then this enables an "inactivity" timeout: whenever this many
152	seconds pass without a successful read or write on the underlying file	162	seconds pass without a successful read or write on the underlying file
153	handle, the C<on_timeout> callback will be invoked (and if that one is	163	handle, the C<on_timeout> callback will be invoked (and if that one is
154	missing, an C<ETIMEDOUT> error will be raised).	164	missing, a non-fatal C<ETIMEDOUT> error will be raised).
155		165
156	Note that timeout processing is also active when you currently do not have	166	Note that timeout processing is also active when you currently do not have
157	any outstanding read or write requests: If you plan to keep the connection	167	any outstanding read or write requests: If you plan to keep the connection
158	idle then you should disable the timout temporarily or ignore the timeout	168	idle then you should disable the timout temporarily or ignore the timeout
159	in the C<on_timeout> callback.	169	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		170	restart the timeout.
160		171
161	Zero (the default) disables this timeout.	172	Zero (the default) disables this timeout.
162		173
163	=item on_timeout => $cb->($handle)	174	=item on_timeout => $cb->($handle)
164		175
…		…
168		179
169	=item rbuf_max => <bytes>	180	=item rbuf_max => <bytes>
170		181
171	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	182	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
172	when the read buffer ever (strictly) exceeds this size. This is useful to	183	when the read buffer ever (strictly) exceeds this size. This is useful to
173	avoid denial-of-service attacks.	184	avoid some forms of denial-of-service attacks.
174		185
175	For example, a server accepting connections from untrusted sources should	186	For example, a server accepting connections from untrusted sources should
176	be configured to accept only so-and-so much data that it cannot act on	187	be configured to accept only so-and-so much data that it cannot act on
177	(for example, when expecting a line, an attacker could send an unlimited	188	(for example, when expecting a line, an attacker could send an unlimited
178	amount of data without a callback ever being called as long as the line	189	amount of data without a callback ever being called as long as the line
179	isn't finished).	190	isn't finished).
180		191
181	=item autocork => <boolean>	192	=item autocork => <boolean>
182		193
183	When disabled (the default), then C<push_write> will try to immediately	194	When disabled (the default), then C<push_write> will try to immediately
184	write the data to the handle if possible. This avoids having to register	195	write the data to the handle, if possible. This avoids having to register
185	a write watcher and wait for the next event loop iteration, but can be	196	a write watcher and wait for the next event loop iteration, but can
186	inefficient if you write multiple small chunks (this disadvantage is	197	be inefficient if you write multiple small chunks (on the wire, this
187	usually avoided by your kernel's nagle algorithm, see C<low_delay>).	198	disadvantage is usually avoided by your kernel's nagle algorithm, see
		199	C<no_delay>, but this option can save costly syscalls).
188		200
189	When enabled, then writes will always be queued till the next event loop	201	When enabled, then writes will always be queued till the next event loop
190	iteration. This is efficient when you do many small writes per iteration,	202	iteration. This is efficient when you do many small writes per iteration,
191	but less efficient when you do a single write only.	203	but less efficient when you do a single write only per iteration (or when
		204	the write buffer often is full). It also increases write latency.
192		205
193	=item no_delay => <boolean>	206	=item no_delay => <boolean>
194		207
195	When doing small writes on sockets, your operating system kernel might	208	When doing small writes on sockets, your operating system kernel might
196	wait a bit for more data before actually sending it out. This is called	209	wait a bit for more data before actually sending it out. This is called
197	the Nagle algorithm, and usually it is beneficial.	210	the Nagle algorithm, and usually it is beneficial.
198		211
199	In some situations you want as low a delay as possible, which cna be	212	In some situations you want as low a delay as possible, which can be
200	accomplishd by setting this option to true.	213	accomplishd by setting this option to a true value.
201		214
202	The default is your opertaing system's default behaviour, this option	215	The default is your opertaing system's default behaviour (most likely
203	explicitly enables or disables it, if possible.	216	enabled), this option explicitly enables or disables it, if possible.
204		217
205	=item read_size => <bytes>	218	=item read_size => <bytes>
206		219
207	The default read block size (the amount of bytes this module will try to read	220	The default read block size (the amount of bytes this module will
208	during each (loop iteration). Default: C<8192>.	221	try to read during each loop iteration, which affects memory
		222	requirements). Default: C<8192>.
209		223
210	=item low_water_mark => <bytes>	224	=item low_water_mark => <bytes>
211		225
212	Sets the amount of bytes (default: C<0>) that make up an "empty" write	226	Sets the amount of bytes (default: C<0>) that make up an "empty" write
213	buffer: If the write reaches this size or gets even samller it is	227	buffer: If the write reaches this size or gets even samller it is
214	considered empty.	228	considered empty.
215		229
		230	Sometimes it can be beneficial (for performance reasons) to add data to
		231	the write buffer before it is fully drained, but this is a rare case, as
		232	the operating system kernel usually buffers data as well, so the default
		233	is good in almost all cases.
		234
216	=item linger => <seconds>	235	=item linger => <seconds>
217		236
218	If non-zero (default: C<3600>), then the destructor of the	237	If non-zero (default: C<3600>), then the destructor of the
219	AnyEvent::Handle object will check wether there is still outstanding write	238	AnyEvent::Handle object will check whether there is still outstanding
220	data and will install a watcher that will write out this data. No errors	239	write data and will install a watcher that will write this data to the
221	will be reported (this mostly matches how the operating system treats	240	socket. No errors will be reported (this mostly matches how the operating
222	outstanding data at socket close time).	241	system treats outstanding data at socket close time).
223		242
224	This will not work for partial TLS data that could not yet been	243	This will not work for partial TLS data that could not be encoded
225	encoded. This data will be lost.	244	yet. This data will be lost. Calling the C<stoptls> method in time might
		245	help.
		246
		247	=item peername => $string
		248
		249	A string used to identify the remote site - usually the DNS hostname
		250	(I<not> IDN!) used to create the connection, rarely the IP address.
		251
		252	Apart from being useful in error messages, this string is also used in TLS
		253	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		254	verification will be skipped when C<peername> is not specified or
		255	C<undef>.
226		256
227	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	257	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
228		258
229	When this parameter is given, it enables TLS (SSL) mode, that means it	259	When this parameter is given, it enables TLS (SSL) mode, that means
230	will start making tls handshake and will transparently encrypt/decrypt	260	AnyEvent will start a TLS handshake as soon as the conenction has been
231	data.	261	established and will transparently encrypt/decrypt data afterwards.
		262
		263	All TLS protocol errors will be signalled as C<EPROTO>, with an
		264	appropriate error message.
232		265
233	TLS mode requires Net::SSLeay to be installed (it will be loaded	266	TLS mode requires Net::SSLeay to be installed (it will be loaded
234	automatically when you try to create a TLS handle).	267	automatically when you try to create a TLS handle): this module doesn't
		268	have a dependency on that module, so if your module requires it, you have
		269	to add the dependency yourself.
235		270
236	For the TLS server side, use C<accept>, and for the TLS client side of a	271	Unlike TCP, TLS has a server and client side: for the TLS server side, use
237	connection, use C<connect> mode.	272	C<accept>, and for the TLS client side of a connection, use C<connect>
		273	mode.
238		274
239	You can also provide your own TLS connection object, but you have	275	You can also provide your own TLS connection object, but you have
240	to make sure that you call either C<Net::SSLeay::set_connect_state>	276	to make sure that you call either C<Net::SSLeay::set_connect_state>
241	or C<Net::SSLeay::set_accept_state> on it before you pass it to	277	or C<Net::SSLeay::set_accept_state> on it before you pass it to
242	AnyEvent::Handle.	278	AnyEvent::Handle. Also, this module will take ownership of this connection
		279	object.
243		280
		281	At some future point, AnyEvent::Handle might switch to another TLS
		282	implementation, then the option to use your own session object will go
		283	away.
		284
		285	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		286	passing in the wrong integer will lead to certain crash. This most often
		287	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		288	segmentation fault.
		289
244	See the C<starttls> method if you need to start TLS negotiation later.	290	See the C<< ->starttls >> method for when need to start TLS negotiation later.
245		291
246	=item tls_ctx => $ssl_ctx	292	=item tls_ctx => $anyevent_tls
247		293
248	Use the given Net::SSLeay::CTX object to create the new TLS connection	294	Use the given C<AnyEvent::TLS> object to create the new TLS connection
249	(unless a connection object was specified directly). If this parameter is	295	(unless a connection object was specified directly). If this parameter is
250	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	296	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
251		297
		298	Instead of an object, you can also specify a hash reference with C<< key
		299	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		300	new TLS context object.
		301
		302	=item on_starttls => $cb->($handle, $success[, $error_message])
		303
		304	This callback will be invoked when the TLS/SSL handshake has finished. If
		305	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		306	(C<on_stoptls> will not be called in this case).
		307
		308	The session in C<< $handle->{tls} >> can still be examined in this
		309	callback, even when the handshake was not successful.
		310
		311	TLS handshake failures will not cause C<on_error> to be invoked when this
		312	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		313
		314	Without this callback, handshake failures lead to C<on_error> being
		315	called, as normal.
		316
		317	Note that you cannot call C<starttls> right again in this callback. If you
		318	need to do that, start an zero-second timer instead whose callback can
		319	then call C<< ->starttls >> again.
		320
		321	=item on_stoptls => $cb->($handle)
		322
		323	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		324	set, then it will be invoked after freeing the TLS session. If it is not,
		325	then a TLS shutdown condition will be treated like a normal EOF condition
		326	on the handle.
		327
		328	The session in C<< $handle->{tls} >> can still be examined in this
		329	callback.
		330
		331	This callback will only be called on TLS shutdowns, not when the
		332	underlying handle signals EOF.
		333
252	=item json => JSON or JSON::XS object	334	=item json => JSON or JSON::XS object
253		335
254	This is the json coder object used by the C<json> read and write types.	336	This is the json coder object used by the C<json> read and write types.
255		337
256	If you don't supply it, then AnyEvent::Handle will create and use a	338	If you don't supply it, then AnyEvent::Handle will create and use a
257	suitable one, which will write and expect UTF-8 encoded JSON texts.	339	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		340	texts.
258		341
259	Note that you are responsible to depend on the JSON module if you want to	342	Note that you are responsible to depend on the JSON module if you want to
260	use this functionality, as AnyEvent does not have a dependency itself.	343	use this functionality, as AnyEvent does not have a dependency itself.
261		344
262	=item filter_r => $cb
263
264	=item filter_w => $cb
265
266	These exist, but are undocumented at this time.
267
268	=back	345	=back
269		346
270	=cut	347	=cut
271		348
272	sub new {	349	sub new {
273	my $class = shift;	350	my $class = shift;
274
275	my $self = bless { @_ }, $class;	351	my $self = bless { @_ }, $class;
276		352
277	$self->{fh} or Carp::croak "mandatory argument fh is missing";	353	$self->{fh} or Carp::croak "mandatory argument fh is missing";
278		354
279	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	355	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
280
281	if ($self->{tls}) {
282	require Net::SSLeay;
283	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
284	}
285		356
286	$self->{_activity} = AnyEvent->now;	357	$self->{_activity} = AnyEvent->now;
287	$self->_timeout;	358	$self->_timeout;
288		359
289	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
290	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};	360	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		361
		362	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		363	if $self->{tls};
		364
		365	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
291		366
292	$self->start_read	367	$self->start_read
293	if $self->{on_read};	368	if $self->{on_read};
294		369
295	$self	370	$self->{fh} && $self
296	}	371	}
297		372
298	sub _shutdown {	373	#sub _shutdown {
299	my ($self) = @_;	374	# my ($self) = @_;
300		375	#
301	delete $self->{_tw};	376	# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
302	delete $self->{_rw};	377	# $self->{_eof} = 1; # tell starttls et. al to stop trying
303	delete $self->{_ww};	378	#
304	delete $self->{fh};	379	# &_freetls;
305		380	#}
306	$self->stoptls;
307
308	delete $self->{on_read};
309	delete $self->{_queue};
310	}
311		381
312	sub _error {	382	sub _error {
313	my ($self, $errno, $fatal) = @_;	383	my ($self, $errno, $fatal, $message) = @_;
314
315	$self->_shutdown
316	if $fatal;
317		384
318	$! = $errno;	385	$! = $errno;
		386	$message \|\|= "$!";
319		387
320	if ($self->{on_error}) {	388	if ($self->{on_error}) {
321	$self->{on_error}($self, $fatal);	389	$self->{on_error}($self, $fatal, $message);
322	} else {	390	$self->destroy;
		391	} elsif ($self->{fh}) {
		392	$self->destroy;
323	Carp::croak "AnyEvent::Handle uncaught error: $!";	393	Carp::croak "AnyEvent::Handle uncaught error: $message";
324	}	394	}
325	}	395	}
326		396
327	=item $fh = $handle->fh	397	=item $fh = $handle->fh
328		398
329	This method returns the file handle of the L<AnyEvent::Handle> object.	399	This method returns the file handle used to create the L<AnyEvent::Handle> object.
330		400
331	=cut	401	=cut
332		402
333	sub fh { $_[0]{fh} }	403	sub fh { $_[0]{fh} }
334		404
…		…
352	$_[0]{on_eof} = $_[1];	422	$_[0]{on_eof} = $_[1];
353	}	423	}
354		424
355	=item $handle->on_timeout ($cb)	425	=item $handle->on_timeout ($cb)
356		426
357	Replace the current C<on_timeout> callback, or disables the callback	427	Replace the current C<on_timeout> callback, or disables the callback (but
358	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	428	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
359	argument.	429	argument and method.
360		430
361	=cut	431	=cut
362		432
363	sub on_timeout {	433	sub on_timeout {
364	$_[0]{on_timeout} = $_[1];	434	$_[0]{on_timeout} = $_[1];
365	}	435	}
366		436
367	=item $handle->autocork ($boolean)	437	=item $handle->autocork ($boolean)
368		438
369	Enables or disables the current autocork behaviour (see C<autocork>	439	Enables or disables the current autocork behaviour (see C<autocork>
370	constructor argument).	440	constructor argument). Changes will only take effect on the next write.
371		441
372	=cut	442	=cut
		443
		444	sub autocork {
		445	$_[0]{autocork} = $_[1];
		446	}
373		447
374	=item $handle->no_delay ($boolean)	448	=item $handle->no_delay ($boolean)
375		449
376	Enables or disables the C<no_delay> setting (see constructor argument of	450	Enables or disables the C<no_delay> setting (see constructor argument of
377	the same name for details).	451	the same name for details).
…		…
383		457
384	eval {	458	eval {
385	local $SIG{__DIE__};	459	local $SIG{__DIE__};
386	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	460	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
387	};	461	};
		462	}
		463
		464	=item $handle->on_starttls ($cb)
		465
		466	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		467
		468	=cut
		469
		470	sub on_starttls {
		471	$_[0]{on_starttls} = $_[1];
		472	}
		473
		474	=item $handle->on_stoptls ($cb)
		475
		476	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		477
		478	=cut
		479
		480	sub on_starttls {
		481	$_[0]{on_stoptls} = $_[1];
388	}	482	}
389		483
390	#############################################################################	484	#############################################################################
391		485
392	=item $handle->timeout ($seconds)	486	=item $handle->timeout ($seconds)
…		…
470	my ($self, $cb) = @_;	564	my ($self, $cb) = @_;
471		565
472	$self->{on_drain} = $cb;	566	$self->{on_drain} = $cb;
473		567
474	$cb->($self)	568	$cb->($self)
475	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	569	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
476	}	570	}
477		571
478	=item $handle->push_write ($data)	572	=item $handle->push_write ($data)
479		573
480	Queues the given scalar to be written. You can push as much data as you	574	Queues the given scalar to be written. You can push as much data as you
…		…
491	Scalar::Util::weaken $self;	585	Scalar::Util::weaken $self;
492		586
493	my $cb = sub {	587	my $cb = sub {
494	my $len = syswrite $self->{fh}, $self->{wbuf};	588	my $len = syswrite $self->{fh}, $self->{wbuf};
495		589
496	if ($len >= 0) {	590	if (defined $len) {
497	substr $self->{wbuf}, 0, $len, "";	591	substr $self->{wbuf}, 0, $len, "";
498		592
499	$self->{_activity} = AnyEvent->now;	593	$self->{_activity} = AnyEvent->now;
500		594
501	$self->{on_drain}($self)	595	$self->{on_drain}($self)
502	if $self->{low_water_mark} >= length $self->{wbuf}	596	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
503	&& $self->{on_drain};	597	&& $self->{on_drain};
504		598
505	delete $self->{_ww} unless length $self->{wbuf};	599	delete $self->{_ww} unless length $self->{wbuf};
506	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	600	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
507	$self->_error ($!, 1);	601	$self->_error ($!, 1);
…		…
531		625
532	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	626	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
533	->($self, @_);	627	->($self, @_);
534	}	628	}
535		629
536	if ($self->{filter_w}) {	630	if ($self->{tls}) {
537	$self->{filter_w}($self, \$_[0]);	631	$self->{_tls_wbuf} .= $_[0];
		632
		633	&_dotls ($self);
538	} else {	634	} else {
539	$self->{wbuf} .= $_[0];	635	$self->{wbuf} .= $_[0];
540	$self->_drain_wbuf;	636	$self->_drain_wbuf;
541	}	637	}
542	}	638	}
…		…
559	=cut	655	=cut
560		656
561	register_write_type netstring => sub {	657	register_write_type netstring => sub {
562	my ($self, $string) = @_;	658	my ($self, $string) = @_;
563		659
564	sprintf "%d:%s,", (length $string), $string	660	(length $string) . ":$string,"
565	};	661	};
566		662
567	=item packstring => $format, $data	663	=item packstring => $format, $data
568		664
569	An octet string prefixed with an encoded length. The encoding C<$format>	665	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
634		730
635	pack "w/a*", Storable::nfreeze ($ref)	731	pack "w/a*", Storable::nfreeze ($ref)
636	};	732	};
637		733
638	=back	734	=back
		735
		736	=item $handle->push_shutdown
		737
		738	Sometimes you know you want to close the socket after writing your data
		739	before it was actually written. One way to do that is to replace your
		740	C<on_drain> handler by a callback that shuts down the socket (and set
		741	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		742	replaces the C<on_drain> callback with:
		743
		744	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		745
		746	This simply shuts down the write side and signals an EOF condition to the
		747	the peer.
		748
		749	You can rely on the normal read queue and C<on_eof> handling
		750	afterwards. This is the cleanest way to close a connection.
		751
		752	=cut
		753
		754	sub push_shutdown {
		755	my ($self) = @_;
		756
		757	delete $self->{low_water_mark};
		758	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		759	}
639		760
640	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	761	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
641		762
642	This function (not method) lets you add your own types to C<push_write>.	763	This function (not method) lets you add your own types to C<push_write>.
643	Whenever the given C<type> is used, C<push_write> will invoke the code	764	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
747	) {	868	) {
748	$self->_error (&Errno::ENOSPC, 1), return;	869	$self->_error (&Errno::ENOSPC, 1), return;
749	}	870	}
750		871
751	while () {	872	while () {
		873	# we need to use a separate tls read buffer, as we must not receive data while
		874	# we are draining the buffer, and this can only happen with TLS.
		875	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
		876
752	my $len = length $self->{rbuf};	877	my $len = length $self->{rbuf};
753		878
754	if (my $cb = shift @{ $self->{_queue} }) {	879	if (my $cb = shift @{ $self->{_queue} }) {
755	unless ($cb->($self)) {	880	unless ($cb->($self)) {
756	if ($self->{_eof}) {	881	if ($self->{_eof}) {
…		…
778		903
779	last; # more data might arrive	904	last; # more data might arrive
780	}	905	}
781	} else {	906	} else {
782	# read side becomes idle	907	# read side becomes idle
783	delete $self->{_rw};	908	delete $self->{_rw} unless $self->{tls};
784	last;	909	last;
785	}	910	}
786	}	911	}
787		912
788	if ($self->{_eof}) {	913	if ($self->{_eof}) {
789	if ($self->{on_eof}) {	914	if ($self->{on_eof}) {
790	$self->{on_eof}($self)	915	$self->{on_eof}($self)
791	} else {	916	} else {
792	$self->_error (0, 1);	917	$self->_error (0, 1, "Unexpected end-of-file");
793	}	918	}
794	}	919	}
795		920
796	# may need to restart read watcher	921	# may need to restart read watcher
797	unless ($self->{_rw}) {	922	unless ($self->{_rw}) {
…		…
817		942
818	=item $handle->rbuf	943	=item $handle->rbuf
819		944
820	Returns the read buffer (as a modifiable lvalue).	945	Returns the read buffer (as a modifiable lvalue).
821		946
822	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	947	You can access the read buffer directly as the C<< ->{rbuf} >>
823	you want.	948	member, if you want. However, the only operation allowed on the
		949	read buffer (apart from looking at it) is removing data from its
		950	beginning. Otherwise modifying or appending to it is not allowed and will
		951	lead to hard-to-track-down bugs.
824		952
825	NOTE: The read buffer should only be used or modified if the C<on_read>,	953	NOTE: The read buffer should only be used or modified if the C<on_read>,
826	C<push_read> or C<unshift_read> methods are used. The other read methods	954	C<push_read> or C<unshift_read> methods are used. The other read methods
827	automatically manage the read buffer.	955	automatically manage the read buffer.
828		956
…		…
1083	An octet string prefixed with an encoded length. The encoding C<$format>	1211	An octet string prefixed with an encoded length. The encoding C<$format>
1084	uses the same format as a Perl C<pack> format, but must specify a single	1212	uses the same format as a Perl C<pack> format, but must specify a single
1085	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1213	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1086	optional C<!>, C<< < >> or C<< > >> modifier).	1214	optional C<!>, C<< < >> or C<< > >> modifier).
1087		1215
1088	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1216	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1217	EPP uses a prefix of C<N> (4 octtes).
1089		1218
1090	Example: read a block of data prefixed by its length in BER-encoded	1219	Example: read a block of data prefixed by its length in BER-encoded
1091	format (very efficient).	1220	format (very efficient).
1092		1221
1093	$handle->push_read (packstring => "w", sub {	1222	$handle->push_read (packstring => "w", sub {
…		…
1123	}	1252	}
1124	};	1253	};
1125		1254
1126	=item json => $cb->($handle, $hash_or_arrayref)	1255	=item json => $cb->($handle, $hash_or_arrayref)
1127		1256
1128	Reads a JSON object or array, decodes it and passes it to the callback.	1257	Reads a JSON object or array, decodes it and passes it to the
		1258	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1129		1259
1130	If a C<json> object was passed to the constructor, then that will be used	1260	If a C<json> object was passed to the constructor, then that will be used
1131	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1261	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1132		1262
1133	This read type uses the incremental parser available with JSON version	1263	This read type uses the incremental parser available with JSON version
…		…
1142	=cut	1272	=cut
1143		1273
1144	register_read_type json => sub {	1274	register_read_type json => sub {
1145	my ($self, $cb) = @_;	1275	my ($self, $cb) = @_;
1146		1276
1147	require JSON;	1277	my $json = $self->{json} \|\|=
		1278	eval { require JSON::XS; JSON::XS->new->utf8 }
		1279	\|\| do { require JSON; JSON->new->utf8 };
1148		1280
1149	my $data;	1281	my $data;
1150	my $rbuf = \$self->{rbuf};	1282	my $rbuf = \$self->{rbuf};
1151		1283
1152	my $json = $self->{json} \|\|= JSON->new->utf8;
1153
1154	sub {	1284	sub {
1155	my $ref = $json->incr_parse ($self->{rbuf});	1285	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1156		1286
1157	if ($ref) {	1287	if ($ref) {
1158	$self->{rbuf} = $json->incr_text;	1288	$self->{rbuf} = $json->incr_text;
1159	$json->incr_text = "";	1289	$json->incr_text = "";
1160	$cb->($self, $ref);	1290	$cb->($self, $ref);
1161		1291
1162	1	1292	1
		1293	} elsif ($@) {
		1294	# error case
		1295	$json->incr_skip;
		1296
		1297	$self->{rbuf} = $json->incr_text;
		1298	$json->incr_text = "";
		1299
		1300	$self->_error (&Errno::EBADMSG);
		1301
		1302	()
1163	} else {	1303	} else {
1164	$self->{rbuf} = "";	1304	$self->{rbuf} = "";
		1305
1165	()	1306	()
1166	}	1307	}
1167	}	1308	}
1168	};	1309	};
1169		1310
…		…
1246	Note that AnyEvent::Handle will automatically C<start_read> for you when	1387	Note that AnyEvent::Handle will automatically C<start_read> for you when
1247	you change the C<on_read> callback or push/unshift a read callback, and it	1388	you change the C<on_read> callback or push/unshift a read callback, and it
1248	will automatically C<stop_read> for you when neither C<on_read> is set nor	1389	will automatically C<stop_read> for you when neither C<on_read> is set nor
1249	there are any read requests in the queue.	1390	there are any read requests in the queue.
1250		1391
		1392	These methods will have no effect when in TLS mode (as TLS doesn't support
		1393	half-duplex connections).
		1394
1251	=cut	1395	=cut
1252		1396
1253	sub stop_read {	1397	sub stop_read {
1254	my ($self) = @_;	1398	my ($self) = @_;
1255		1399
1256	delete $self->{_rw};	1400	delete $self->{_rw} unless $self->{tls};
1257	}	1401	}
1258		1402
1259	sub start_read {	1403	sub start_read {
1260	my ($self) = @_;	1404	my ($self) = @_;
1261		1405
1262	unless ($self->{_rw} \|\| $self->{_eof}) {	1406	unless ($self->{_rw} \|\| $self->{_eof}) {
1263	Scalar::Util::weaken $self;	1407	Scalar::Util::weaken $self;
1264		1408
1265	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1409	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1266	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1410	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1267	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1411	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1268		1412
1269	if ($len > 0) {	1413	if ($len > 0) {
1270	$self->{_activity} = AnyEvent->now;	1414	$self->{_activity} = AnyEvent->now;
1271		1415
1272	$self->{filter_r}	1416	if ($self->{tls}) {
1273	? $self->{filter_r}($self, $rbuf)	1417	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1274	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1418
		1419	&_dotls ($self);
		1420	} else {
		1421	$self->_drain_rbuf unless $self->{_in_drain};
		1422	}
1275		1423
1276	} elsif (defined $len) {	1424	} elsif (defined $len) {
1277	delete $self->{_rw};	1425	delete $self->{_rw};
1278	$self->{_eof} = 1;	1426	$self->{_eof} = 1;
1279	$self->_drain_rbuf unless $self->{_in_drain};	1427	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1283	}	1431	}
1284	});	1432	});
1285	}	1433	}
1286	}	1434	}
1287		1435
		1436	our $ERROR_SYSCALL;
		1437	our $ERROR_WANT_READ;
		1438
		1439	sub _tls_error {
		1440	my ($self, $err) = @_;
		1441
		1442	return $self->_error ($!, 1)
		1443	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1444
		1445	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1446
		1447	# reduce error string to look less scary
		1448	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1449
		1450	if ($self->{_on_starttls}) {
		1451	(delete $self->{_on_starttls})->($self, undef, $err);
		1452	&_freetls;
		1453	} else {
		1454	&_freetls;
		1455	$self->_error (&Errno::EPROTO, 1, $err);
		1456	}
		1457	}
		1458
		1459	# poll the write BIO and send the data if applicable
		1460	# also decode read data if possible
		1461	# this is basiclaly our TLS state machine
		1462	# more efficient implementations are possible with openssl,
		1463	# but not with the buggy and incomplete Net::SSLeay.
1288	sub _dotls {	1464	sub _dotls {
1289	my ($self) = @_;	1465	my ($self) = @_;
1290		1466
1291	my $buf;	1467	my $tmp;
1292		1468
1293	if (length $self->{_tls_wbuf}) {	1469	if (length $self->{_tls_wbuf}) {
1294	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1470	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1295	substr $self->{_tls_wbuf}, 0, $len, "";	1471	substr $self->{_tls_wbuf}, 0, $tmp, "";
1296	}	1472	}
1297	}
1298		1473
		1474	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1475	return $self->_tls_error ($tmp)
		1476	if $tmp != $ERROR_WANT_READ
		1477	&& ($tmp != $ERROR_SYSCALL \|\| $!);
		1478	}
		1479
		1480	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1481	unless (length $tmp) {
		1482	$self->{_on_starttls}
		1483	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1484	&_freetls;
		1485
		1486	if ($self->{on_stoptls}) {
		1487	$self->{on_stoptls}($self);
		1488	return;
		1489	} else {
		1490	# let's treat SSL-eof as we treat normal EOF
		1491	delete $self->{_rw};
		1492	$self->{_eof} = 1;
		1493	}
		1494	}
		1495
		1496	$self->{_tls_rbuf} .= $tmp;
		1497	$self->_drain_rbuf unless $self->{_in_drain};
		1498	$self->{tls} or return; # tls session might have gone away in callback
		1499	}
		1500
		1501	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1502	return $self->_tls_error ($tmp)
		1503	if $tmp != $ERROR_WANT_READ
		1504	&& ($tmp != $ERROR_SYSCALL \|\| $!);
		1505
1299	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1506	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1300	$self->{wbuf} .= $buf;	1507	$self->{wbuf} .= $tmp;
1301	$self->_drain_wbuf;	1508	$self->_drain_wbuf;
1302	}	1509	}
1303		1510
1304	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1511	$self->{_on_starttls}
1305	if (length $buf) {	1512	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1306	$self->{rbuf} .= $buf;	1513	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1307	$self->_drain_rbuf unless $self->{_in_drain};
1308	} else {
1309	# let's treat SSL-eof as we treat normal EOF
1310	$self->{_eof} = 1;
1311	$self->_shutdown;
1312	return;
1313	}
1314	}
1315
1316	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1317
1318	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1319	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1320	return $self->_error ($!, 1);
1321	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1322	return $self->_error (&Errno::EIO, 1);
1323	}
1324
1325	# all others are fine for our purposes
1326	}
1327	}	1514	}
1328		1515
1329	=item $handle->starttls ($tls[, $tls_ctx])	1516	=item $handle->starttls ($tls[, $tls_ctx])
1330		1517
1331	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1518	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
…		…
1333	C<starttls>.	1520	C<starttls>.
1334		1521
1335	The first argument is the same as the C<tls> constructor argument (either	1522	The first argument is the same as the C<tls> constructor argument (either
1336	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1523	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1337		1524
1338	The second argument is the optional C<Net::SSLeay::CTX> object that is	1525	The second argument is the optional C<AnyEvent::TLS> object that is used
1339	used when AnyEvent::Handle has to create its own TLS connection object.	1526	when AnyEvent::Handle has to create its own TLS connection object, or
		1527	a hash reference with C<< key => value >> pairs that will be used to
		1528	construct a new context.
1340		1529
1341	The TLS connection object will end up in C<< $handle->{tls} >> after this	1530	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1342	call and can be used or changed to your liking. Note that the handshake	1531	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1343	might have already started when this function returns.	1532	changed to your liking. Note that the handshake might have already started
		1533	when this function returns.
1344		1534
		1535	If it an error to start a TLS handshake more than once per
		1536	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1537
1345	=cut	1538	=cut
		1539
		1540	our %TLS_CACHE; #TODO not yet documented, should we?
1346		1541
1347	sub starttls {	1542	sub starttls {
1348	my ($self, $ssl, $ctx) = @_;	1543	my ($self, $ssl, $ctx) = @_;
1349		1544
1350	$self->stoptls;	1545	require Net::SSLeay;
1351		1546
1352	if ($ssl eq "accept") {	1547	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1353	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1548	if $self->{tls};
1354	Net::SSLeay::set_accept_state ($ssl);	1549
1355	} elsif ($ssl eq "connect") {	1550	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1356	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1551	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1357	Net::SSLeay::set_connect_state ($ssl);	1552
		1553	$ctx \|\|= $self->{tls_ctx};
		1554
		1555	if ("HASH" eq ref $ctx) {
		1556	require AnyEvent::TLS;
		1557
		1558	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context
		1559
		1560	if ($ctx->{cache}) {
		1561	my $key = $ctx+0;
		1562	$ctx = $TLS_CACHE{$key} \|\|= new AnyEvent::TLS %$ctx;
		1563	} else {
		1564	$ctx = new AnyEvent::TLS %$ctx;
		1565	}
		1566	}
1358	}	1567
1359		1568	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1360	$self->{tls} = $ssl;	1569	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});
1361		1570
1362	# basically, this is deep magic (because SSL_read should have the same issues)	1571	# basically, this is deep magic (because SSL_read should have the same issues)
1363	# but the openssl maintainers basically said: "trust us, it just works".	1572	# but the openssl maintainers basically said: "trust us, it just works".
1364	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1573	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1365	# and mismaintained ssleay-module doesn't even offer them).	1574	# and mismaintained ssleay-module doesn't even offer them).
1366	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1575	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1576	#
		1577	# in short: this is a mess.
		1578	#
		1579	# note that we do not try to keep the length constant between writes as we are required to do.
		1580	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1581	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1582	# have identity issues in that area.
1367	Net::SSLeay::CTX_set_mode ($self->{tls},	1583	# Net::SSLeay::CTX_set_mode ($ssl,
1368	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1584	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1369	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1585	# \| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1586	Net::SSLeay::CTX_set_mode ($ssl, 1\|2);
1370		1587
1371	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1588	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1372	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1589	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1373		1590
1374	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1591	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1375		1592
1376	$self->{filter_w} = sub {	1593	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1377	$_[0]{_tls_wbuf} .= ${$_[1]};	1594	if $self->{on_starttls};
1378	&_dotls;	1595
1379	};	1596	&_dotls; # need to trigger the initial handshake
1380	$self->{filter_r} = sub {	1597	$self->start_read; # make sure we actually do read
1381	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1382	&_dotls;
1383	};
1384	}	1598	}
1385		1599
1386	=item $handle->stoptls	1600	=item $handle->stoptls
1387		1601
1388	Destroys the SSL connection, if any. Partial read or write data will be	1602	Shuts down the SSL connection - this makes a proper EOF handshake by
1389	lost.	1603	sending a close notify to the other side, but since OpenSSL doesn't
		1604	support non-blocking shut downs, it is not possible to re-use the stream
		1605	afterwards.
1390		1606
1391	=cut	1607	=cut
1392		1608
1393	sub stoptls {	1609	sub stoptls {
1394	my ($self) = @_;	1610	my ($self) = @_;
1395		1611
1396	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1612	if ($self->{tls}) {
		1613	Net::SSLeay::shutdown ($self->{tls});
1397		1614
1398	delete $self->{_rbio};	1615	&_dotls;
1399	delete $self->{_wbio};	1616
1400	delete $self->{_tls_wbuf};	1617	# # we don't give a shit. no, we do, but we can't. no...#d#
1401	delete $self->{filter_r};	1618	# # we, we... have to use openssl :/#d#
1402	delete $self->{filter_w};	1619	# &_freetls;#d#
		1620	}
		1621	}
		1622
		1623	sub _freetls {
		1624	my ($self) = @_;
		1625
		1626	return unless $self->{tls};
		1627
		1628	$self->{tls_ctx}->_put_session (delete $self->{tls});
		1629
		1630	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1403	}	1631	}
1404		1632
1405	sub DESTROY {	1633	sub DESTROY {
1406	my $self = shift;	1634	my ($self) = @_;
1407		1635
1408	$self->stoptls;	1636	&_freetls;
1409		1637
1410	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1638	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1411		1639
1412	if ($linger && length $self->{wbuf}) {	1640	if ($linger && length $self->{wbuf}) {
1413	my $fh = delete $self->{fh};	1641	my $fh = delete $self->{fh};
…		…
1428	@linger = ();	1656	@linger = ();
1429	});	1657	});
1430	}	1658	}
1431	}	1659	}
1432		1660
		1661	=item $handle->destroy
		1662
		1663	Shuts down the handle object as much as possible - this call ensures that
		1664	no further callbacks will be invoked and as many resources as possible
		1665	will be freed. You must not call any methods on the object afterwards.
		1666
		1667	Normally, you can just "forget" any references to an AnyEvent::Handle
		1668	object and it will simply shut down. This works in fatal error and EOF
		1669	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1670	callback, so when you want to destroy the AnyEvent::Handle object from
		1671	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1672	that case.
		1673
		1674	Destroying the handle object in this way has the advantage that callbacks
		1675	will be removed as well, so if those are the only reference holders (as
		1676	is common), then one doesn't need to do anything special to break any
		1677	reference cycles.
		1678
		1679	The handle might still linger in the background and write out remaining
		1680	data, as specified by the C<linger> option, however.
		1681
		1682	=cut
		1683
		1684	sub destroy {
		1685	my ($self) = @_;
		1686
		1687	$self->DESTROY;
		1688	%$self = ();
		1689	}
		1690
1433	=item AnyEvent::Handle::TLS_CTX	1691	=item AnyEvent::Handle::TLS_CTX
1434		1692
1435	This function creates and returns the Net::SSLeay::CTX object used by	1693	This function creates and returns the AnyEvent::TLS object used by default
1436	default for TLS mode.	1694	for TLS mode.
1437		1695
1438	The context is created like this:	1696	The context is created by calling L<AnyEvent::TLS> without any arguments.
1439
1440	Net::SSLeay::load_error_strings;
1441	Net::SSLeay::SSLeay_add_ssl_algorithms;
1442	Net::SSLeay::randomize;
1443
1444	my $CTX = Net::SSLeay::CTX_new;
1445
1446	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1447		1697
1448	=cut	1698	=cut
1449		1699
1450	our $TLS_CTX;	1700	our $TLS_CTX;
1451		1701
1452	sub TLS_CTX() {	1702	sub TLS_CTX() {
1453	$TLS_CTX \|\| do {	1703	$TLS_CTX \|\|= do {
1454	require Net::SSLeay;	1704	require AnyEvent::TLS;
1455		1705
1456	Net::SSLeay::load_error_strings ();	1706	new AnyEvent::TLS
1457	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1458	Net::SSLeay::randomize ();
1459
1460	$TLS_CTX = Net::SSLeay::CTX_new ();
1461
1462	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1463
1464	$TLS_CTX
1465	}	1707	}
1466	}	1708	}
1467		1709
1468	=back	1710	=back
		1711
		1712
		1713	=head1 NONFREQUENTLY ASKED QUESTIONS
		1714
		1715	=over 4
		1716
		1717	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1718	still get further invocations!
		1719
		1720	That's because AnyEvent::Handle keeps a reference to itself when handling
		1721	read or write callbacks.
		1722
		1723	It is only safe to "forget" the reference inside EOF or error callbacks,
		1724	from within all other callbacks, you need to explicitly call the C<<
		1725	->destroy >> method.
		1726
		1727	=item I get different callback invocations in TLS mode/Why can't I pause
		1728	reading?
		1729
		1730	Unlike, say, TCP, TLS connections do not consist of two independent
		1731	communication channels, one for each direction. Or put differently. The
		1732	read and write directions are not independent of each other: you cannot
		1733	write data unless you are also prepared to read, and vice versa.
		1734
		1735	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1736	callback invocations when you are not expecting any read data - the reason
		1737	is that AnyEvent::Handle always reads in TLS mode.
		1738
		1739	During the connection, you have to make sure that you always have a
		1740	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1741	connection (or when you no longer want to use it) you can call the
		1742	C<destroy> method.
		1743
		1744	=item How do I read data until the other side closes the connection?
		1745
		1746	If you just want to read your data into a perl scalar, the easiest way
		1747	to achieve this is by setting an C<on_read> callback that does nothing,
		1748	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1749	will be in C<$_[0]{rbuf}>:
		1750
		1751	$handle->on_read (sub { });
		1752	$handle->on_eof (undef);
		1753	$handle->on_error (sub {
		1754	my $data = delete $_[0]{rbuf};
		1755	});
		1756
		1757	The reason to use C<on_error> is that TCP connections, due to latencies
		1758	and packets loss, might get closed quite violently with an error, when in
		1759	fact, all data has been received.
		1760
		1761	It is usually better to use acknowledgements when transferring data,
		1762	to make sure the other side hasn't just died and you got the data
		1763	intact. This is also one reason why so many internet protocols have an
		1764	explicit QUIT command.
		1765
		1766	=item I don't want to destroy the handle too early - how do I wait until
		1767	all data has been written?
		1768
		1769	After writing your last bits of data, set the C<on_drain> callback
		1770	and destroy the handle in there - with the default setting of
		1771	C<low_water_mark> this will be called precisely when all data has been
		1772	written to the socket:
		1773
		1774	$handle->push_write (...);
		1775	$handle->on_drain (sub {
		1776	warn "all data submitted to the kernel\n";
		1777	undef $handle;
		1778	});
		1779
		1780	If you just want to queue some data and then signal EOF to the other side,
		1781	consider using C<< ->push_shutdown >> instead.
		1782
		1783	=item I want to contact a TLS/SSL server, I don't care about security.
		1784
		1785	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1786	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1787	parameter:
		1788
		1789	tcp_connect $host, $port, sub {
		1790	my ($fh) = @_;
		1791
		1792	my $handle = new AnyEvent::Handle
		1793	fh => $fh,
		1794	tls => "connect",
		1795	on_error => sub { ... };
		1796
		1797	$handle->push_write (...);
		1798	};
		1799
		1800	=item I want to contact a TLS/SSL server, I do care about security.
		1801
		1802	Then you should additionally enable certificate verification, including
		1803	peername verification, if the protocol you use supports it (see
		1804	L<AnyEvent::TLS>, C<verify_peername>).
		1805
		1806	E.g. for HTTPS:
		1807
		1808	tcp_connect $host, $port, sub {
		1809	my ($fh) = @_;
		1810
		1811	my $handle = new AnyEvent::Handle
		1812	fh => $fh,
		1813	peername => $host,
		1814	tls => "connect",
		1815	tls_ctx => { verify => 1, verify_peername => "https" },
		1816	...
		1817
		1818	Note that you must specify the hostname you connected to (or whatever
		1819	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1820	peername verification will be done.
		1821
		1822	The above will use the system-dependent default set of trusted CA
		1823	certificates. If you want to check against a specific CA, add the
		1824	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1825
		1826	tls_ctx => {
		1827	verify => 1,
		1828	verify_peername => "https",
		1829	ca_file => "my-ca-cert.pem",
		1830	},
		1831
		1832	=item I want to create a TLS/SSL server, how do I do that?
		1833
		1834	Well, you first need to get a server certificate and key. You have
		1835	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1836	self-signed certificate (cheap. check the search engine of your choice,
		1837	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1838	nice program for that purpose).
		1839
		1840	Then create a file with your private key (in PEM format, see
		1841	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1842	file should then look like this:
		1843
		1844	-----BEGIN RSA PRIVATE KEY-----
		1845	...header data
		1846	... lots of base64'y-stuff
		1847	-----END RSA PRIVATE KEY-----
		1848
		1849	-----BEGIN CERTIFICATE-----
		1850	... lots of base64'y-stuff
		1851	-----END CERTIFICATE-----
		1852
		1853	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		1854	specify this file as C<cert_file>:
		1855
		1856	tcp_server undef, $port, sub {
		1857	my ($fh) = @_;
		1858
		1859	my $handle = new AnyEvent::Handle
		1860	fh => $fh,
		1861	tls => "accept",
		1862	tls_ctx => { cert_file => "my-server-keycert.pem" },
		1863	...
		1864
		1865	When you have intermediate CA certificates that your clients might not
		1866	know about, just append them to the C<cert_file>.
		1867
		1868	=back
		1869
1469		1870
1470	=head1 SUBCLASSING AnyEvent::Handle	1871	=head1 SUBCLASSING AnyEvent::Handle
1471		1872
1472	In many cases, you might want to subclass AnyEvent::Handle.	1873	In many cases, you might want to subclass AnyEvent::Handle.
1473		1874

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.83 by root, Thu Aug 21 19:11:37 2008 UTC vs. Revision 1.149 by root, Thu Jul 16 03:48:33 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.83 by root, Thu Aug 21 19:11:37 2008 UTC vs.
Revision 1.149 by root, Thu Jul 16 03:48:33 2009 UTC