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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.82 by root, Thu Aug 21 18:45:16 2008 UTC vs.
Revision 1.158 by root, Fri Jul 24 08:40:35 2009 UTC

…		…
1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	no warnings;
4	use strict qw(subs vars);
5
6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	3	use Scalar::Util ();
9	use Carp ();	4	use Carp ();
10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);	5	use Errno qw(EAGAIN EINTR);
12		6
		7	use AnyEvent (); BEGIN { AnyEvent::common_sense }
		8	use AnyEvent::Util qw(WSAEWOULDBLOCK);
		9
13	=head1 NAME	10	=head1 NAME
14		11
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	12	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		13
17	=cut	14	=cut
18		15
19	our $VERSION = 4.232;	16	our $VERSION = 4.86;
20		17
21	=head1 SYNOPSIS	18	=head1 SYNOPSIS
22		19
23	use AnyEvent;	20	use AnyEvent;
24	use AnyEvent::Handle;	21	use AnyEvent::Handle;
25		22
26	my $cv = AnyEvent->condvar;	23	my $cv = AnyEvent->condvar;
27		24
28	my $handle =	25	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	26	fh => \*STDIN,
31	on_eof => sub {	27	on_error => sub {
32	$cv->broadcast;	28	my ($hdl, $fatal, $msg) = @_;
33	},	29	warn "got error $msg\n";
		30	$hdl->destroy;
		31	$cv->send;
34	);	32	);
35		33
36	# send some request line	34	# send some request line
37	$handle->push_write ("getinfo\015\012");	35	$hdl->push_write ("getinfo\015\012");
38		36
39	# read the response line	37	# read the response line
40	$handle->push_read (line => sub {	38	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	39	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	40	warn "got line <$line>\n";
43	$cv->send;	41	$cv->send;
44	});	42	});
45		43
46	$cv->recv;	44	$cv->recv;
47		45
49		47
50	This module is a helper module to make it easier to do event-based I/O on	48	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	49	filehandles. For utility functions for doing non-blocking connects and accepts
52	on sockets see L<AnyEvent::Util>.	50	on sockets see L<AnyEvent::Util>.
53		51
		52	The L<AnyEvent::Intro> tutorial contains some well-documented
		53	AnyEvent::Handle examples.
		54
54	In the following, when the documentation refers to of "bytes" then this	55	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	56	means characters. As sysread and syswrite are used for all I/O, their
56	treatment of characters applies to this module as well.	57	treatment of characters applies to this module as well.
57		58
58	All callbacks will be invoked with the handle object as their first	59	All callbacks will be invoked with the handle object as their first
…		…
60		61
61	=head1 METHODS	62	=head1 METHODS
62		63
63	=over 4	64	=over 4
64		65
65	=item B<new (%args)>	66	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
66		67
67	The constructor supports these arguments (all as key => value pairs).	68	The constructor supports these arguments (all as C<< key => value >> pairs).
68		69
69	=over 4	70	=over 4
70		71
71	=item fh => $filehandle [MANDATORY]	72	=item fh => $filehandle [MANDATORY]
72		73
		74	#=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
		75
73	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
74
75	NOTE: The filehandle will be set to non-blocking (using	77	NOTE: The filehandle will be set to non-blocking mode (using
76	AnyEvent::Util::fh_nonblocking).	78	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		79	that mode.
		80
		81	#=item connect => [$host, $service]
		82	#
		83	# You have to specify either this parameter, or C<connect>, below.
		84	#Try to connect to the specified host and service (port), using
		85	#C<AnyEvent::Socket::tcp_connect>.
		86	#
		87	#When this
77		88
78	=item on_eof => $cb->($handle)	89	=item on_eof => $cb->($handle)
79		90
80	Set the callback to be called when an end-of-file condition is detected,	91	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	92	i.e. in the case of a socket, when the other side has closed the
82	connection cleanly.	93	connection cleanly, and there are no outstanding read requests in the
		94	queue (if there are read requests, then an EOF counts as an unexpected
		95	connection close and will be flagged as an error).
83		96
84	For sockets, this just means that the other side has stopped sending data,	97	For sockets, this just means that the other side has stopped sending data,
85	you can still try to write data, and, in fact, one can return from the eof	98	you can still try to write data, and, in fact, one can return from the EOF
86	callback and continue writing data, as only the read part has been shut	99	callback and continue writing data, as only the read part has been shut
87	down.	100	down.
88		101
89	While not mandatory, it is I<highly> recommended to set an eof callback,
90	otherwise you might end up with a closed socket while you are still
91	waiting for data.
92
93	If an EOF condition has been detected but no C<on_eof> callback has been	102	If an EOF condition has been detected but no C<on_eof> callback has been
94	set, then a fatal error will be raised with C<$!> set to <0>.	103	set, then a fatal error will be raised with C<$!> set to <0>.
95		104
96	=item on_error => $cb->($handle, $fatal)	105	=item on_error => $cb->($handle, $fatal, $message)
97		106
98	This is the error callback, which is called when, well, some error	107	This is the error callback, which is called when, well, some error
99	occured, such as not being able to resolve the hostname, failure to	108	occured, such as not being able to resolve the hostname, failure to
100	connect or a read error.	109	connect or a read error.
101		110
102	Some errors are fatal (which is indicated by C<$fatal> being true). On	111	Some errors are fatal (which is indicated by C<$fatal> being true). On
103	fatal errors the handle object will be shut down and will not be usable	112	fatal errors the handle object will be destroyed (by a call to C<< ->
104	(but you are free to look at the current C< ->rbuf >). Examples of fatal	113	destroy >>) after invoking the error callback (which means you are free to
105	errors are an EOF condition with active (but unsatisifable) read watchers	114	examine the handle object). Examples of fatal errors are an EOF condition
106	(C<EPIPE>) or I/O errors.	115	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors.
		116
		117	AnyEvent::Handle tries to find an appropriate error code for you to check
		118	against, but in some cases (TLS errors), this does not work well. It is
		119	recommended to always output the C<$message> argument in human-readable
		120	error messages (it's usually the same as C<"$!">).
107		121
108	Non-fatal errors can be retried by simply returning, but it is recommended	122	Non-fatal errors can be retried by simply returning, but it is recommended
109	to simply ignore this parameter and instead abondon the handle object	123	to simply ignore this parameter and instead abondon the handle object
110	when this callback is invoked. Examples of non-fatal errors are timeouts	124	when this callback is invoked. Examples of non-fatal errors are timeouts
111	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	125	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
112		126
113	On callback entrance, the value of C<$!> contains the operating system	127	On callback entrance, the value of C<$!> contains the operating system
114	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	128	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		129	C<EPROTO>).
115		130
116	While not mandatory, it is I<highly> recommended to set this callback, as	131	While not mandatory, it is I<highly> recommended to set this callback, as
117	you will not be notified of errors otherwise. The default simply calls	132	you will not be notified of errors otherwise. The default simply calls
118	C<croak>.	133	C<croak>.
119		134
…		…
123	and no read request is in the queue (unlike read queue callbacks, this	138	and no read request is in the queue (unlike read queue callbacks, this
124	callback will only be called when at least one octet of data is in the	139	callback will only be called when at least one octet of data is in the
125	read buffer).	140	read buffer).
126		141
127	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	142	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
128	method or access the C<$handle->{rbuf}> member directly.	143	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		144	must not enlarge or modify the read buffer, you can only remove data at
		145	the beginning from it.
129		146
130	When an EOF condition is detected then AnyEvent::Handle will first try to	147	When an EOF condition is detected then AnyEvent::Handle will first try to
131	feed all the remaining data to the queued callbacks and C<on_read> before	148	feed all the remaining data to the queued callbacks and C<on_read> before
132	calling the C<on_eof> callback. If no progress can be made, then a fatal	149	calling the C<on_eof> callback. If no progress can be made, then a fatal
133	error will be raised (with C<$!> set to C<EPIPE>).	150	error will be raised (with C<$!> set to C<EPIPE>).
		151
		152	Note that, unlike requests in the read queue, an C<on_read> callback
		153	doesn't mean you I<require> some data: if there is an EOF and there
		154	are outstanding read requests then an error will be flagged. With an
		155	C<on_read> callback, the C<on_eof> callback will be invoked.
134		156
135	=item on_drain => $cb->($handle)	157	=item on_drain => $cb->($handle)
136		158
137	This sets the callback that is called when the write buffer becomes empty	159	This sets the callback that is called when the write buffer becomes empty
138	(or when the callback is set and the buffer is empty already).	160	(or when the callback is set and the buffer is empty already).
…		…
148	=item timeout => $fractional_seconds	170	=item timeout => $fractional_seconds
149		171
150	If non-zero, then this enables an "inactivity" timeout: whenever this many	172	If non-zero, then this enables an "inactivity" timeout: whenever this many
151	seconds pass without a successful read or write on the underlying file	173	seconds pass without a successful read or write on the underlying file
152	handle, the C<on_timeout> callback will be invoked (and if that one is	174	handle, the C<on_timeout> callback will be invoked (and if that one is
153	missing, an C<ETIMEDOUT> error will be raised).	175	missing, a non-fatal C<ETIMEDOUT> error will be raised).
154		176
155	Note that timeout processing is also active when you currently do not have	177	Note that timeout processing is also active when you currently do not have
156	any outstanding read or write requests: If you plan to keep the connection	178	any outstanding read or write requests: If you plan to keep the connection
157	idle then you should disable the timout temporarily or ignore the timeout	179	idle then you should disable the timout temporarily or ignore the timeout
158	in the C<on_timeout> callback.	180	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		181	restart the timeout.
159		182
160	Zero (the default) disables this timeout.	183	Zero (the default) disables this timeout.
161		184
162	=item on_timeout => $cb->($handle)	185	=item on_timeout => $cb->($handle)
163		186
…		…
167		190
168	=item rbuf_max => <bytes>	191	=item rbuf_max => <bytes>
169		192
170	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	193	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
171	when the read buffer ever (strictly) exceeds this size. This is useful to	194	when the read buffer ever (strictly) exceeds this size. This is useful to
172	avoid denial-of-service attacks.	195	avoid some forms of denial-of-service attacks.
173		196
174	For example, a server accepting connections from untrusted sources should	197	For example, a server accepting connections from untrusted sources should
175	be configured to accept only so-and-so much data that it cannot act on	198	be configured to accept only so-and-so much data that it cannot act on
176	(for example, when expecting a line, an attacker could send an unlimited	199	(for example, when expecting a line, an attacker could send an unlimited
177	amount of data without a callback ever being called as long as the line	200	amount of data without a callback ever being called as long as the line
178	isn't finished).	201	isn't finished).
179		202
180	=item autocork => <boolean>	203	=item autocork => <boolean>
181		204
182	When disabled (the default), then C<push_write> will try to immediately	205	When disabled (the default), then C<push_write> will try to immediately
183	write the data to the handle if possible. This avoids having to register	206	write the data to the handle, if possible. This avoids having to register
184	a write watcher and wait for the next event loop iteration, but can be	207	a write watcher and wait for the next event loop iteration, but can
185	inefficient if you write multiple small chunks (this disadvantage is	208	be inefficient if you write multiple small chunks (on the wire, this
186	usually avoided by your kernel's nagle algorithm, see C<low_delay>).	209	disadvantage is usually avoided by your kernel's nagle algorithm, see
		210	C<no_delay>, but this option can save costly syscalls).
187		211
188	When enabled, then writes will always be queued till the next event loop	212	When enabled, then writes will always be queued till the next event loop
189	iteration. This is efficient when you do many small writes per iteration,	213	iteration. This is efficient when you do many small writes per iteration,
190	but less efficient when you do a single write only.	214	but less efficient when you do a single write only per iteration (or when
		215	the write buffer often is full). It also increases write latency.
191		216
192	=item no_delay => <boolean>	217	=item no_delay => <boolean>
193		218
194	When doing small writes on sockets, your operating system kernel might	219	When doing small writes on sockets, your operating system kernel might
195	wait a bit for more data before actually sending it out. This is called	220	wait a bit for more data before actually sending it out. This is called
196	the Nagle algorithm, and usually it is beneficial.	221	the Nagle algorithm, and usually it is beneficial.
197		222
198	In some situations you want as low a delay as possible, which cna be	223	In some situations you want as low a delay as possible, which can be
199	accomplishd by setting this option to true.	224	accomplishd by setting this option to a true value.
200		225
201	The default is your opertaing system's default behaviour, this option	226	The default is your opertaing system's default behaviour (most likely
202	explicitly enables or disables it, if possible.	227	enabled), this option explicitly enables or disables it, if possible.
203		228
204	=item read_size => <bytes>	229	=item read_size => <bytes>
205		230
206	The default read block size (the amount of bytes this module will try to read	231	The default read block size (the amount of bytes this module will
207	during each (loop iteration). Default: C<8192>.	232	try to read during each loop iteration, which affects memory
		233	requirements). Default: C<8192>.
208		234
209	=item low_water_mark => <bytes>	235	=item low_water_mark => <bytes>
210		236
211	Sets the amount of bytes (default: C<0>) that make up an "empty" write	237	Sets the amount of bytes (default: C<0>) that make up an "empty" write
212	buffer: If the write reaches this size or gets even samller it is	238	buffer: If the write reaches this size or gets even samller it is
213	considered empty.	239	considered empty.
214		240
		241	Sometimes it can be beneficial (for performance reasons) to add data to
		242	the write buffer before it is fully drained, but this is a rare case, as
		243	the operating system kernel usually buffers data as well, so the default
		244	is good in almost all cases.
		245
215	=item linger => <seconds>	246	=item linger => <seconds>
216		247
217	If non-zero (default: C<3600>), then the destructor of the	248	If non-zero (default: C<3600>), then the destructor of the
218	AnyEvent::Handle object will check wether there is still outstanding write	249	AnyEvent::Handle object will check whether there is still outstanding
219	data and will install a watcher that will write out this data. No errors	250	write data and will install a watcher that will write this data to the
220	will be reported (this mostly matches how the operating system treats	251	socket. No errors will be reported (this mostly matches how the operating
221	outstanding data at socket close time).	252	system treats outstanding data at socket close time).
222		253
223	This will not work for partial TLS data that could not yet been	254	This will not work for partial TLS data that could not be encoded
224	encoded. This data will be lost.	255	yet. This data will be lost. Calling the C<stoptls> method in time might
		256	help.
		257
		258	=item peername => $string
		259
		260	A string used to identify the remote site - usually the DNS hostname
		261	(I<not> IDN!) used to create the connection, rarely the IP address.
		262
		263	Apart from being useful in error messages, this string is also used in TLS
		264	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		265	verification will be skipped when C<peername> is not specified or
		266	C<undef>.
225		267
226	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	268	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
227		269
228	When this parameter is given, it enables TLS (SSL) mode, that means it	270	When this parameter is given, it enables TLS (SSL) mode, that means
229	will start making tls handshake and will transparently encrypt/decrypt	271	AnyEvent will start a TLS handshake as soon as the conenction has been
230	data.	272	established and will transparently encrypt/decrypt data afterwards.
		273
		274	All TLS protocol errors will be signalled as C<EPROTO>, with an
		275	appropriate error message.
231		276
232	TLS mode requires Net::SSLeay to be installed (it will be loaded	277	TLS mode requires Net::SSLeay to be installed (it will be loaded
233	automatically when you try to create a TLS handle).	278	automatically when you try to create a TLS handle): this module doesn't
		279	have a dependency on that module, so if your module requires it, you have
		280	to add the dependency yourself.
234		281
235	For the TLS server side, use C<accept>, and for the TLS client side of a	282	Unlike TCP, TLS has a server and client side: for the TLS server side, use
236	connection, use C<connect> mode.	283	C<accept>, and for the TLS client side of a connection, use C<connect>
		284	mode.
237		285
238	You can also provide your own TLS connection object, but you have	286	You can also provide your own TLS connection object, but you have
239	to make sure that you call either C<Net::SSLeay::set_connect_state>	287	to make sure that you call either C<Net::SSLeay::set_connect_state>
240	or C<Net::SSLeay::set_accept_state> on it before you pass it to	288	or C<Net::SSLeay::set_accept_state> on it before you pass it to
241	AnyEvent::Handle.	289	AnyEvent::Handle. Also, this module will take ownership of this connection
		290	object.
242		291
		292	At some future point, AnyEvent::Handle might switch to another TLS
		293	implementation, then the option to use your own session object will go
		294	away.
		295
		296	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		297	passing in the wrong integer will lead to certain crash. This most often
		298	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		299	segmentation fault.
		300
243	See the C<starttls> method if you need to start TLS negotiation later.	301	See the C<< ->starttls >> method for when need to start TLS negotiation later.
244		302
245	=item tls_ctx => $ssl_ctx	303	=item tls_ctx => $anyevent_tls
246		304
247	Use the given Net::SSLeay::CTX object to create the new TLS connection	305	Use the given C<AnyEvent::TLS> object to create the new TLS connection
248	(unless a connection object was specified directly). If this parameter is	306	(unless a connection object was specified directly). If this parameter is
249	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	307	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
250		308
		309	Instead of an object, you can also specify a hash reference with C<< key
		310	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		311	new TLS context object.
		312
		313	=item on_starttls => $cb->($handle, $success[, $error_message])
		314
		315	This callback will be invoked when the TLS/SSL handshake has finished. If
		316	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		317	(C<on_stoptls> will not be called in this case).
		318
		319	The session in C<< $handle->{tls} >> can still be examined in this
		320	callback, even when the handshake was not successful.
		321
		322	TLS handshake failures will not cause C<on_error> to be invoked when this
		323	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		324
		325	Without this callback, handshake failures lead to C<on_error> being
		326	called, as normal.
		327
		328	Note that you cannot call C<starttls> right again in this callback. If you
		329	need to do that, start an zero-second timer instead whose callback can
		330	then call C<< ->starttls >> again.
		331
		332	=item on_stoptls => $cb->($handle)
		333
		334	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		335	set, then it will be invoked after freeing the TLS session. If it is not,
		336	then a TLS shutdown condition will be treated like a normal EOF condition
		337	on the handle.
		338
		339	The session in C<< $handle->{tls} >> can still be examined in this
		340	callback.
		341
		342	This callback will only be called on TLS shutdowns, not when the
		343	underlying handle signals EOF.
		344
251	=item json => JSON or JSON::XS object	345	=item json => JSON or JSON::XS object
252		346
253	This is the json coder object used by the C<json> read and write types.	347	This is the json coder object used by the C<json> read and write types.
254		348
255	If you don't supply it, then AnyEvent::Handle will create and use a	349	If you don't supply it, then AnyEvent::Handle will create and use a
256	suitable one, which will write and expect UTF-8 encoded JSON texts.	350	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		351	texts.
257		352
258	Note that you are responsible to depend on the JSON module if you want to	353	Note that you are responsible to depend on the JSON module if you want to
259	use this functionality, as AnyEvent does not have a dependency itself.	354	use this functionality, as AnyEvent does not have a dependency itself.
260		355
261	=item filter_r => $cb
262
263	=item filter_w => $cb
264
265	These exist, but are undocumented at this time.
266
267	=back	356	=back
268		357
269	=cut	358	=cut
270		359
271	sub new {	360	sub new {
272	my $class = shift;	361	my $class = shift;
273
274	my $self = bless { @_ }, $class;	362	my $self = bless { @_ }, $class;
275		363
276	$self->{fh} or Carp::croak "mandatory argument fh is missing";	364	$self->{fh} or Carp::croak "mandatory argument fh is missing";
277		365
278	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	366	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
279
280	if ($self->{tls}) {
281	require Net::SSLeay;
282	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
283	}
284		367
285	$self->{_activity} = AnyEvent->now;	368	$self->{_activity} = AnyEvent->now;
286	$self->_timeout;	369	$self->_timeout;
287		370
288	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
289	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};	371	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		372
		373	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		374	if $self->{tls};
		375
		376	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
290		377
291	$self->start_read	378	$self->start_read
292	if $self->{on_read};	379	if $self->{on_read};
293		380
294	$self	381	$self->{fh} && $self
295	}	382	}
296		383
297	sub _shutdown {	384	#sub _shutdown {
298	my ($self) = @_;	385	# my ($self) = @_;
299		386	#
300	delete $self->{_tw};	387	# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
301	delete $self->{_rw};	388	# $self->{_eof} = 1; # tell starttls et. al to stop trying
302	delete $self->{_ww};	389	#
303	delete $self->{fh};	390	# &_freetls;
304		391	#}
305	$self->stoptls;
306
307	delete $self->{on_read};
308	delete $self->{_queue};
309	}
310		392
311	sub _error {	393	sub _error {
312	my ($self, $errno, $fatal) = @_;	394	my ($self, $errno, $fatal, $message) = @_;
313
314	$self->_shutdown
315	if $fatal;
316		395
317	$! = $errno;	396	$! = $errno;
		397	$message \|\|= "$!";
318		398
319	if ($self->{on_error}) {	399	if ($self->{on_error}) {
320	$self->{on_error}($self, $fatal);	400	$self->{on_error}($self, $fatal, $message);
321	} else {	401	$self->destroy if $fatal;
		402	} elsif ($self->{fh}) {
		403	$self->destroy;
322	Carp::croak "AnyEvent::Handle uncaught error: $!";	404	Carp::croak "AnyEvent::Handle uncaught error: $message";
323	}	405	}
324	}	406	}
325		407
326	=item $fh = $handle->fh	408	=item $fh = $handle->fh
327		409
328	This method returns the file handle of the L<AnyEvent::Handle> object.	410	This method returns the file handle used to create the L<AnyEvent::Handle> object.
329		411
330	=cut	412	=cut
331		413
332	sub fh { $_[0]{fh} }	414	sub fh { $_[0]{fh} }
333		415
…		…
351	$_[0]{on_eof} = $_[1];	433	$_[0]{on_eof} = $_[1];
352	}	434	}
353		435
354	=item $handle->on_timeout ($cb)	436	=item $handle->on_timeout ($cb)
355		437
356	Replace the current C<on_timeout> callback, or disables the callback	438	Replace the current C<on_timeout> callback, or disables the callback (but
357	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	439	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
358	argument.	440	argument and method.
359		441
360	=cut	442	=cut
361		443
362	sub on_timeout {	444	sub on_timeout {
363	$_[0]{on_timeout} = $_[1];	445	$_[0]{on_timeout} = $_[1];
364	}	446	}
365		447
366	=item $handle->autocork ($boolean)	448	=item $handle->autocork ($boolean)
367		449
368	Enables or disables the current autocork behaviour (see C<autocork>	450	Enables or disables the current autocork behaviour (see C<autocork>
369	constructor argument).	451	constructor argument). Changes will only take effect on the next write.
370		452
371	=cut	453	=cut
		454
		455	sub autocork {
		456	$_[0]{autocork} = $_[1];
		457	}
372		458
373	=item $handle->no_delay ($boolean)	459	=item $handle->no_delay ($boolean)
374		460
375	Enables or disables the C<no_delay> setting (see constructor argument of	461	Enables or disables the C<no_delay> setting (see constructor argument of
376	the same name for details).	462	the same name for details).
…		…
384	local $SIG{__DIE__};	470	local $SIG{__DIE__};
385	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	471	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];
386	};	472	};
387	}	473	}
388		474
		475	=item $handle->on_starttls ($cb)
		476
		477	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		478
		479	=cut
		480
		481	sub on_starttls {
		482	$_[0]{on_starttls} = $_[1];
		483	}
		484
		485	=item $handle->on_stoptls ($cb)
		486
		487	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		488
		489	=cut
		490
		491	sub on_starttls {
		492	$_[0]{on_stoptls} = $_[1];
		493	}
		494
389	#############################################################################	495	#############################################################################
390		496
391	=item $handle->timeout ($seconds)	497	=item $handle->timeout ($seconds)
392		498
393	Configures (or disables) the inactivity timeout.	499	Configures (or disables) the inactivity timeout.
…		…
417	$self->{_activity} = $NOW;	523	$self->{_activity} = $NOW;
418		524
419	if ($self->{on_timeout}) {	525	if ($self->{on_timeout}) {
420	$self->{on_timeout}($self);	526	$self->{on_timeout}($self);
421	} else {	527	} else {
422	$self->_error (&Errno::ETIMEDOUT);	528	$self->_error (Errno::ETIMEDOUT);
423	}	529	}
424		530
425	# callback could have changed timeout value, optimise	531	# callback could have changed timeout value, optimise
426	return unless $self->{timeout};	532	return unless $self->{timeout};
427		533
…		…
469	my ($self, $cb) = @_;	575	my ($self, $cb) = @_;
470		576
471	$self->{on_drain} = $cb;	577	$self->{on_drain} = $cb;
472		578
473	$cb->($self)	579	$cb->($self)
474	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	580	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
475	}	581	}
476		582
477	=item $handle->push_write ($data)	583	=item $handle->push_write ($data)
478		584
479	Queues the given scalar to be written. You can push as much data as you	585	Queues the given scalar to be written. You can push as much data as you
…		…
490	Scalar::Util::weaken $self;	596	Scalar::Util::weaken $self;
491		597
492	my $cb = sub {	598	my $cb = sub {
493	my $len = syswrite $self->{fh}, $self->{wbuf};	599	my $len = syswrite $self->{fh}, $self->{wbuf};
494		600
495	if ($len >= 0) {	601	if (defined $len) {
496	substr $self->{wbuf}, 0, $len, "";	602	substr $self->{wbuf}, 0, $len, "";
497		603
498	$self->{_activity} = AnyEvent->now;	604	$self->{_activity} = AnyEvent->now;
499		605
500	$self->{on_drain}($self)	606	$self->{on_drain}($self)
501	if $self->{low_water_mark} >= length $self->{wbuf}	607	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
502	&& $self->{on_drain};	608	&& $self->{on_drain};
503		609
504	delete $self->{_ww} unless length $self->{wbuf};	610	delete $self->{_ww} unless length $self->{wbuf};
505	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	611	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
506	$self->_error ($!, 1);	612	$self->_error ($!, 1);
…		…
530		636
531	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	637	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
532	->($self, @_);	638	->($self, @_);
533	}	639	}
534		640
535	if ($self->{filter_w}) {	641	if ($self->{tls}) {
536	$self->{filter_w}($self, \$_[0]);	642	$self->{_tls_wbuf} .= $_[0];
		643
		644	&_dotls ($self);
537	} else {	645	} else {
538	$self->{wbuf} .= $_[0];	646	$self->{wbuf} .= $_[0];
539	$self->_drain_wbuf;	647	$self->_drain_wbuf;
540	}	648	}
541	}	649	}
…		…
558	=cut	666	=cut
559		667
560	register_write_type netstring => sub {	668	register_write_type netstring => sub {
561	my ($self, $string) = @_;	669	my ($self, $string) = @_;
562		670
563	sprintf "%d:%s,", (length $string), $string	671	(length $string) . ":$string,"
564	};	672	};
565		673
566	=item packstring => $format, $data	674	=item packstring => $format, $data
567		675
568	An octet string prefixed with an encoded length. The encoding C<$format>	676	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
633		741
634	pack "w/a*", Storable::nfreeze ($ref)	742	pack "w/a*", Storable::nfreeze ($ref)
635	};	743	};
636		744
637	=back	745	=back
		746
		747	=item $handle->push_shutdown
		748
		749	Sometimes you know you want to close the socket after writing your data
		750	before it was actually written. One way to do that is to replace your
		751	C<on_drain> handler by a callback that shuts down the socket (and set
		752	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		753	replaces the C<on_drain> callback with:
		754
		755	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		756
		757	This simply shuts down the write side and signals an EOF condition to the
		758	the peer.
		759
		760	You can rely on the normal read queue and C<on_eof> handling
		761	afterwards. This is the cleanest way to close a connection.
		762
		763	=cut
		764
		765	sub push_shutdown {
		766	my ($self) = @_;
		767
		768	delete $self->{low_water_mark};
		769	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		770	}
638		771
639	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	772	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
640		773
641	This function (not method) lets you add your own types to C<push_write>.	774	This function (not method) lets you add your own types to C<push_write>.
642	Whenever the given C<type> is used, C<push_write> will invoke the code	775	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
742		875
743	if (	876	if (
744	defined $self->{rbuf_max}	877	defined $self->{rbuf_max}
745	&& $self->{rbuf_max} < length $self->{rbuf}	878	&& $self->{rbuf_max} < length $self->{rbuf}
746	) {	879	) {
747	$self->_error (&Errno::ENOSPC, 1), return;	880	$self->_error (Errno::ENOSPC, 1), return;
748	}	881	}
749		882
750	while () {	883	while () {
		884	# we need to use a separate tls read buffer, as we must not receive data while
		885	# we are draining the buffer, and this can only happen with TLS.
		886	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};
		887
751	my $len = length $self->{rbuf};	888	my $len = length $self->{rbuf};
752		889
753	if (my $cb = shift @{ $self->{_queue} }) {	890	if (my $cb = shift @{ $self->{_queue} }) {
754	unless ($cb->($self)) {	891	unless ($cb->($self)) {
755	if ($self->{_eof}) {	892	if ($self->{_eof}) {
756	# no progress can be made (not enough data and no data forthcoming)	893	# no progress can be made (not enough data and no data forthcoming)
757	$self->_error (&Errno::EPIPE, 1), return;	894	$self->_error (Errno::EPIPE, 1), return;
758	}	895	}
759		896
760	unshift @{ $self->{_queue} }, $cb;	897	unshift @{ $self->{_queue} }, $cb;
761	last;	898	last;
762	}	899	}
…		…
770	&& !@{ $self->{_queue} } # and the queue is still empty	907	&& !@{ $self->{_queue} } # and the queue is still empty
771	&& $self->{on_read} # but we still have on_read	908	&& $self->{on_read} # but we still have on_read
772	) {	909	) {
773	# no further data will arrive	910	# no further data will arrive
774	# so no progress can be made	911	# so no progress can be made
775	$self->_error (&Errno::EPIPE, 1), return	912	$self->_error (Errno::EPIPE, 1), return
776	if $self->{_eof};	913	if $self->{_eof};
777		914
778	last; # more data might arrive	915	last; # more data might arrive
779	}	916	}
780	} else {	917	} else {
781	# read side becomes idle	918	# read side becomes idle
782	delete $self->{_rw};	919	delete $self->{_rw} unless $self->{tls};
783	last;	920	last;
784	}	921	}
785	}	922	}
786		923
787	if ($self->{_eof}) {	924	if ($self->{_eof}) {
788	if ($self->{on_eof}) {	925	if ($self->{on_eof}) {
789	$self->{on_eof}($self)	926	$self->{on_eof}($self)
790	} else {	927	} else {
791	$self->_error (0, 1);	928	$self->_error (0, 1, "Unexpected end-of-file");
792	}	929	}
793	}	930	}
794		931
795	# may need to restart read watcher	932	# may need to restart read watcher
796	unless ($self->{_rw}) {	933	unless ($self->{_rw}) {
…		…
816		953
817	=item $handle->rbuf	954	=item $handle->rbuf
818		955
819	Returns the read buffer (as a modifiable lvalue).	956	Returns the read buffer (as a modifiable lvalue).
820		957
821	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	958	You can access the read buffer directly as the C<< ->{rbuf} >>
822	you want.	959	member, if you want. However, the only operation allowed on the
		960	read buffer (apart from looking at it) is removing data from its
		961	beginning. Otherwise modifying or appending to it is not allowed and will
		962	lead to hard-to-track-down bugs.
823		963
824	NOTE: The read buffer should only be used or modified if the C<on_read>,	964	NOTE: The read buffer should only be used or modified if the C<on_read>,
825	C<push_read> or C<unshift_read> methods are used. The other read methods	965	C<push_read> or C<unshift_read> methods are used. The other read methods
826	automatically manage the read buffer.	966	automatically manage the read buffer.
827		967
…		…
1027	return 1;	1167	return 1;
1028	}	1168	}
1029		1169
1030	# reject	1170	# reject
1031	if ($reject && $$rbuf =~ $reject) {	1171	if ($reject && $$rbuf =~ $reject) {
1032	$self->_error (&Errno::EBADMSG);	1172	$self->_error (Errno::EBADMSG);
1033	}	1173	}
1034		1174
1035	# skip	1175	# skip
1036	if ($skip && $$rbuf =~ $skip) {	1176	if ($skip && $$rbuf =~ $skip) {
1037	$data .= substr $$rbuf, 0, $+[0], "";	1177	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1053	my ($self, $cb) = @_;	1193	my ($self, $cb) = @_;
1054		1194
1055	sub {	1195	sub {
1056	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {	1196	unless ($_[0]{rbuf} =~ s/^(0\|[1-9][0-9]*)://) {
1057	if ($_[0]{rbuf} =~ /[^0-9]/) {	1197	if ($_[0]{rbuf} =~ /[^0-9]/) {
1058	$self->_error (&Errno::EBADMSG);	1198	$self->_error (Errno::EBADMSG);
1059	}	1199	}
1060	return;	1200	return;
1061	}	1201	}
1062		1202
1063	my $len = $1;	1203	my $len = $1;
…		…
1066	my $string = $_[1];	1206	my $string = $_[1];
1067	$_[0]->unshift_read (chunk => 1, sub {	1207	$_[0]->unshift_read (chunk => 1, sub {
1068	if ($_[1] eq ",") {	1208	if ($_[1] eq ",") {
1069	$cb->($_[0], $string);	1209	$cb->($_[0], $string);
1070	} else {	1210	} else {
1071	$self->_error (&Errno::EBADMSG);	1211	$self->_error (Errno::EBADMSG);
1072	}	1212	}
1073	});	1213	});
1074	});	1214	});
1075		1215
1076	1	1216	1
…		…
1082	An octet string prefixed with an encoded length. The encoding C<$format>	1222	An octet string prefixed with an encoded length. The encoding C<$format>
1083	uses the same format as a Perl C<pack> format, but must specify a single	1223	uses the same format as a Perl C<pack> format, but must specify a single
1084	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1224	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1085	optional C<!>, C<< < >> or C<< > >> modifier).	1225	optional C<!>, C<< < >> or C<< > >> modifier).
1086		1226
1087	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1227	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1228	EPP uses a prefix of C<N> (4 octtes).
1088		1229
1089	Example: read a block of data prefixed by its length in BER-encoded	1230	Example: read a block of data prefixed by its length in BER-encoded
1090	format (very efficient).	1231	format (very efficient).
1091		1232
1092	$handle->push_read (packstring => "w", sub {	1233	$handle->push_read (packstring => "w", sub {
…		…
1122	}	1263	}
1123	};	1264	};
1124		1265
1125	=item json => $cb->($handle, $hash_or_arrayref)	1266	=item json => $cb->($handle, $hash_or_arrayref)
1126		1267
1127	Reads a JSON object or array, decodes it and passes it to the callback.	1268	Reads a JSON object or array, decodes it and passes it to the
		1269	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1128		1270
1129	If a C<json> object was passed to the constructor, then that will be used	1271	If a C<json> object was passed to the constructor, then that will be used
1130	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1272	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1131		1273
1132	This read type uses the incremental parser available with JSON version	1274	This read type uses the incremental parser available with JSON version
…		…
1141	=cut	1283	=cut
1142		1284
1143	register_read_type json => sub {	1285	register_read_type json => sub {
1144	my ($self, $cb) = @_;	1286	my ($self, $cb) = @_;
1145		1287
1146	require JSON;	1288	my $json = $self->{json} \|\|=
		1289	eval { require JSON::XS; JSON::XS->new->utf8 }
		1290	\|\| do { require JSON; JSON->new->utf8 };
1147		1291
1148	my $data;	1292	my $data;
1149	my $rbuf = \$self->{rbuf};	1293	my $rbuf = \$self->{rbuf};
1150		1294
1151	my $json = $self->{json} \|\|= JSON->new->utf8;
1152
1153	sub {	1295	sub {
1154	my $ref = $json->incr_parse ($self->{rbuf});	1296	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1155		1297
1156	if ($ref) {	1298	if ($ref) {
1157	$self->{rbuf} = $json->incr_text;	1299	$self->{rbuf} = $json->incr_text;
1158	$json->incr_text = "";	1300	$json->incr_text = "";
1159	$cb->($self, $ref);	1301	$cb->($self, $ref);
1160		1302
1161	1	1303	1
		1304	} elsif ($@) {
		1305	# error case
		1306	$json->incr_skip;
		1307
		1308	$self->{rbuf} = $json->incr_text;
		1309	$json->incr_text = "";
		1310
		1311	$self->_error (Errno::EBADMSG);
		1312
		1313	()
1162	} else {	1314	} else {
1163	$self->{rbuf} = "";	1315	$self->{rbuf} = "";
		1316
1164	()	1317	()
1165	}	1318	}
1166	}	1319	}
1167	};	1320	};
1168		1321
…		…
1200	# read remaining chunk	1353	# read remaining chunk
1201	$_[0]->unshift_read (chunk => $len, sub {	1354	$_[0]->unshift_read (chunk => $len, sub {
1202	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1355	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1203	$cb->($_[0], $ref);	1356	$cb->($_[0], $ref);
1204	} else {	1357	} else {
1205	$self->_error (&Errno::EBADMSG);	1358	$self->_error (Errno::EBADMSG);
1206	}	1359	}
1207	});	1360	});
1208	}	1361	}
1209		1362
1210	1	1363	1
…		…
1245	Note that AnyEvent::Handle will automatically C<start_read> for you when	1398	Note that AnyEvent::Handle will automatically C<start_read> for you when
1246	you change the C<on_read> callback or push/unshift a read callback, and it	1399	you change the C<on_read> callback or push/unshift a read callback, and it
1247	will automatically C<stop_read> for you when neither C<on_read> is set nor	1400	will automatically C<stop_read> for you when neither C<on_read> is set nor
1248	there are any read requests in the queue.	1401	there are any read requests in the queue.
1249		1402
		1403	These methods will have no effect when in TLS mode (as TLS doesn't support
		1404	half-duplex connections).
		1405
1250	=cut	1406	=cut
1251		1407
1252	sub stop_read {	1408	sub stop_read {
1253	my ($self) = @_;	1409	my ($self) = @_;
1254		1410
1255	delete $self->{_rw};	1411	delete $self->{_rw} unless $self->{tls};
1256	}	1412	}
1257		1413
1258	sub start_read {	1414	sub start_read {
1259	my ($self) = @_;	1415	my ($self) = @_;
1260		1416
1261	unless ($self->{_rw} \|\| $self->{_eof}) {	1417	unless ($self->{_rw} \|\| $self->{_eof}) {
1262	Scalar::Util::weaken $self;	1418	Scalar::Util::weaken $self;
1263		1419
1264	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1420	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1265	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1421	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1266	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1422	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1267		1423
1268	if ($len > 0) {	1424	if ($len > 0) {
1269	$self->{_activity} = AnyEvent->now;	1425	$self->{_activity} = AnyEvent->now;
1270		1426
1271	$self->{filter_r}	1427	if ($self->{tls}) {
1272	? $self->{filter_r}($self, $rbuf)	1428	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1273	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1429
		1430	&_dotls ($self);
		1431	} else {
		1432	$self->_drain_rbuf unless $self->{_in_drain};
		1433	}
1274		1434
1275	} elsif (defined $len) {	1435	} elsif (defined $len) {
1276	delete $self->{_rw};	1436	delete $self->{_rw};
1277	$self->{_eof} = 1;	1437	$self->{_eof} = 1;
1278	$self->_drain_rbuf unless $self->{_in_drain};	1438	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1282	}	1442	}
1283	});	1443	});
1284	}	1444	}
1285	}	1445	}
1286		1446
		1447	our $ERROR_SYSCALL;
		1448	our $ERROR_WANT_READ;
		1449
		1450	sub _tls_error {
		1451	my ($self, $err) = @_;
		1452
		1453	return $self->_error ($!, 1)
		1454	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1455
		1456	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1457
		1458	# reduce error string to look less scary
		1459	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1460
		1461	if ($self->{_on_starttls}) {
		1462	(delete $self->{_on_starttls})->($self, undef, $err);
		1463	&_freetls;
		1464	} else {
		1465	&_freetls;
		1466	$self->_error (Errno::EPROTO, 1, $err);
		1467	}
		1468	}
		1469
		1470	# poll the write BIO and send the data if applicable
		1471	# also decode read data if possible
		1472	# this is basiclaly our TLS state machine
		1473	# more efficient implementations are possible with openssl,
		1474	# but not with the buggy and incomplete Net::SSLeay.
1287	sub _dotls {	1475	sub _dotls {
1288	my ($self) = @_;	1476	my ($self) = @_;
1289		1477
1290	my $buf;	1478	my $tmp;
1291		1479
1292	if (length $self->{_tls_wbuf}) {	1480	if (length $self->{_tls_wbuf}) {
1293	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1481	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1294	substr $self->{_tls_wbuf}, 0, $len, "";	1482	substr $self->{_tls_wbuf}, 0, $tmp, "";
1295	}	1483	}
1296	}
1297		1484
		1485	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1486	return $self->_tls_error ($tmp)
		1487	if $tmp != $ERROR_WANT_READ
		1488	&& ($tmp != $ERROR_SYSCALL \|\| $!);
		1489	}
		1490
		1491	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1492	unless (length $tmp) {
		1493	$self->{_on_starttls}
		1494	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1495	&_freetls;
		1496
		1497	if ($self->{on_stoptls}) {
		1498	$self->{on_stoptls}($self);
		1499	return;
		1500	} else {
		1501	# let's treat SSL-eof as we treat normal EOF
		1502	delete $self->{_rw};
		1503	$self->{_eof} = 1;
		1504	}
		1505	}
		1506
		1507	$self->{_tls_rbuf} .= $tmp;
		1508	$self->_drain_rbuf unless $self->{_in_drain};
		1509	$self->{tls} or return; # tls session might have gone away in callback
		1510	}
		1511
		1512	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1513	return $self->_tls_error ($tmp)
		1514	if $tmp != $ERROR_WANT_READ
		1515	&& ($tmp != $ERROR_SYSCALL \|\| $!);
		1516
1298	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1517	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1299	$self->{wbuf} .= $buf;	1518	$self->{wbuf} .= $tmp;
1300	$self->_drain_wbuf;	1519	$self->_drain_wbuf;
1301	}	1520	}
1302		1521
1303	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1522	$self->{_on_starttls}
1304	if (length $buf) {	1523	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1305	$self->{rbuf} .= $buf;	1524	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1306	$self->_drain_rbuf unless $self->{_in_drain};
1307	} else {
1308	# let's treat SSL-eof as we treat normal EOF
1309	$self->{_eof} = 1;
1310	$self->_shutdown;
1311	return;
1312	}
1313	}
1314
1315	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1316
1317	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1318	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1319	return $self->_error ($!, 1);
1320	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1321	return $self->_error (&Errno::EIO, 1);
1322	}
1323
1324	# all others are fine for our purposes
1325	}
1326	}	1525	}
1327		1526
1328	=item $handle->starttls ($tls[, $tls_ctx])	1527	=item $handle->starttls ($tls[, $tls_ctx])
1329		1528
1330	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1529	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1331	object is created, you can also do that at a later time by calling	1530	object is created, you can also do that at a later time by calling
1332	C<starttls>.	1531	C<starttls>.
1333		1532
		1533	Starting TLS is currently an asynchronous operation - when you push some
		1534	write data and then call C<< ->starttls >> then TLS negotiation will start
		1535	immediately, after which the queued write data is then sent.
		1536
1334	The first argument is the same as the C<tls> constructor argument (either	1537	The first argument is the same as the C<tls> constructor argument (either
1335	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1538	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1336		1539
1337	The second argument is the optional C<Net::SSLeay::CTX> object that is	1540	The second argument is the optional C<AnyEvent::TLS> object that is used
1338	used when AnyEvent::Handle has to create its own TLS connection object.	1541	when AnyEvent::Handle has to create its own TLS connection object, or
		1542	a hash reference with C<< key => value >> pairs that will be used to
		1543	construct a new context.
1339		1544
1340	The TLS connection object will end up in C<< $handle->{tls} >> after this	1545	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1341	call and can be used or changed to your liking. Note that the handshake	1546	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1342	might have already started when this function returns.	1547	changed to your liking. Note that the handshake might have already started
		1548	when this function returns.
1343		1549
		1550	If it an error to start a TLS handshake more than once per
		1551	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1552
1344	=cut	1553	=cut
		1554
		1555	our %TLS_CACHE; #TODO not yet documented, should we?
1345		1556
1346	sub starttls {	1557	sub starttls {
1347	my ($self, $ssl, $ctx) = @_;	1558	my ($self, $ssl, $ctx) = @_;
1348		1559
1349	$self->stoptls;	1560	require Net::SSLeay;
1350		1561
1351	if ($ssl eq "accept") {	1562	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1352	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1563	if $self->{tls};
1353	Net::SSLeay::set_accept_state ($ssl);	1564
1354	} elsif ($ssl eq "connect") {	1565	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1355	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1566	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1356	Net::SSLeay::set_connect_state ($ssl);	1567
		1568	$ctx \|\|= $self->{tls_ctx};
		1569
		1570	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1571
		1572	if ("HASH" eq ref $ctx) {
		1573	require AnyEvent::TLS;
		1574
		1575	if ($ctx->{cache}) {
		1576	my $key = $ctx+0;
		1577	$ctx = $TLS_CACHE{$key} \|\|= new AnyEvent::TLS %$ctx;
		1578	} else {
		1579	$ctx = new AnyEvent::TLS %$ctx;
		1580	}
		1581	}
1357	}	1582
1358		1583	$self->{tls_ctx} = $ctx \|\| TLS_CTX ();
1359	$self->{tls} = $ssl;	1584	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});
1360		1585
1361	# basically, this is deep magic (because SSL_read should have the same issues)	1586	# basically, this is deep magic (because SSL_read should have the same issues)
1362	# but the openssl maintainers basically said: "trust us, it just works".	1587	# but the openssl maintainers basically said: "trust us, it just works".
1363	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1588	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1364	# and mismaintained ssleay-module doesn't even offer them).	1589	# and mismaintained ssleay-module doesn't even offer them).
1365	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1590	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1591	#
		1592	# in short: this is a mess.
		1593	#
		1594	# note that we do not try to keep the length constant between writes as we are required to do.
		1595	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1596	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1597	# have identity issues in that area.
1366	Net::SSLeay::CTX_set_mode ($self->{tls},	1598	# Net::SSLeay::CTX_set_mode ($ssl,
1367	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1599	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1368	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1600	# \| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
		1601	Net::SSLeay::CTX_set_mode ($ssl, 1\|2);
1369		1602
1370	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1603	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1371	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1604	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1372		1605
1373	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1606	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1374		1607
1375	$self->{filter_w} = sub {	1608	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1376	$_[0]{_tls_wbuf} .= ${$_[1]};	1609	if $self->{on_starttls};
1377	&_dotls;	1610
1378	};	1611	&_dotls; # need to trigger the initial handshake
1379	$self->{filter_r} = sub {	1612	$self->start_read; # make sure we actually do read
1380	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1381	&_dotls;
1382	};
1383	}	1613	}
1384		1614
1385	=item $handle->stoptls	1615	=item $handle->stoptls
1386		1616
1387	Destroys the SSL connection, if any. Partial read or write data will be	1617	Shuts down the SSL connection - this makes a proper EOF handshake by
1388	lost.	1618	sending a close notify to the other side, but since OpenSSL doesn't
		1619	support non-blocking shut downs, it is not possible to re-use the stream
		1620	afterwards.
1389		1621
1390	=cut	1622	=cut
1391		1623
1392	sub stoptls {	1624	sub stoptls {
1393	my ($self) = @_;	1625	my ($self) = @_;
1394		1626
1395	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1627	if ($self->{tls}) {
		1628	Net::SSLeay::shutdown ($self->{tls});
1396		1629
1397	delete $self->{_rbio};	1630	&_dotls;
1398	delete $self->{_wbio};	1631
1399	delete $self->{_tls_wbuf};	1632	# # we don't give a shit. no, we do, but we can't. no...#d#
1400	delete $self->{filter_r};	1633	# # we, we... have to use openssl :/#d#
1401	delete $self->{filter_w};	1634	# &_freetls;#d#
		1635	}
		1636	}
		1637
		1638	sub _freetls {
		1639	my ($self) = @_;
		1640
		1641	return unless $self->{tls};
		1642
		1643	$self->{tls_ctx}->_put_session (delete $self->{tls});
		1644
		1645	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1402	}	1646	}
1403		1647
1404	sub DESTROY {	1648	sub DESTROY {
1405	my $self = shift;	1649	my ($self) = @_;
1406		1650
1407	$self->stoptls;	1651	&_freetls;
1408		1652
1409	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1653	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1410		1654
1411	if ($linger && length $self->{wbuf}) {	1655	if ($linger && length $self->{wbuf} && $self->{fh}) {
1412	my $fh = delete $self->{fh};	1656	my $fh = delete $self->{fh};
1413	my $wbuf = delete $self->{wbuf};	1657	my $wbuf = delete $self->{wbuf};
1414		1658
1415	my @linger;	1659	my @linger;
1416		1660
…		…
1427	@linger = ();	1671	@linger = ();
1428	});	1672	});
1429	}	1673	}
1430	}	1674	}
1431		1675
		1676	=item $handle->destroy
		1677
		1678	Shuts down the handle object as much as possible - this call ensures that
		1679	no further callbacks will be invoked and as many resources as possible
		1680	will be freed. You must not call any methods on the object afterwards.
		1681
		1682	Normally, you can just "forget" any references to an AnyEvent::Handle
		1683	object and it will simply shut down. This works in fatal error and EOF
		1684	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1685	callback, so when you want to destroy the AnyEvent::Handle object from
		1686	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1687	that case.
		1688
		1689	Destroying the handle object in this way has the advantage that callbacks
		1690	will be removed as well, so if those are the only reference holders (as
		1691	is common), then one doesn't need to do anything special to break any
		1692	reference cycles.
		1693
		1694	The handle might still linger in the background and write out remaining
		1695	data, as specified by the C<linger> option, however.
		1696
		1697	=cut
		1698
		1699	sub destroy {
		1700	my ($self) = @_;
		1701
		1702	$self->DESTROY;
		1703	%$self = ();
		1704	}
		1705
1432	=item AnyEvent::Handle::TLS_CTX	1706	=item AnyEvent::Handle::TLS_CTX
1433		1707
1434	This function creates and returns the Net::SSLeay::CTX object used by	1708	This function creates and returns the AnyEvent::TLS object used by default
1435	default for TLS mode.	1709	for TLS mode.
1436		1710
1437	The context is created like this:	1711	The context is created by calling L<AnyEvent::TLS> without any arguments.
1438
1439	Net::SSLeay::load_error_strings;
1440	Net::SSLeay::SSLeay_add_ssl_algorithms;
1441	Net::SSLeay::randomize;
1442
1443	my $CTX = Net::SSLeay::CTX_new;
1444
1445	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1446		1712
1447	=cut	1713	=cut
1448		1714
1449	our $TLS_CTX;	1715	our $TLS_CTX;
1450		1716
1451	sub TLS_CTX() {	1717	sub TLS_CTX() {
1452	$TLS_CTX \|\| do {	1718	$TLS_CTX \|\|= do {
1453	require Net::SSLeay;	1719	require AnyEvent::TLS;
1454		1720
1455	Net::SSLeay::load_error_strings ();	1721	new AnyEvent::TLS
1456	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1457	Net::SSLeay::randomize ();
1458
1459	$TLS_CTX = Net::SSLeay::CTX_new ();
1460
1461	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1462
1463	$TLS_CTX
1464	}	1722	}
1465	}	1723	}
1466		1724
1467	=back	1725	=back
		1726
		1727
		1728	=head1 NONFREQUENTLY ASKED QUESTIONS
		1729
		1730	=over 4
		1731
		1732	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1733	still get further invocations!
		1734
		1735	That's because AnyEvent::Handle keeps a reference to itself when handling
		1736	read or write callbacks.
		1737
		1738	It is only safe to "forget" the reference inside EOF or error callbacks,
		1739	from within all other callbacks, you need to explicitly call the C<<
		1740	->destroy >> method.
		1741
		1742	=item I get different callback invocations in TLS mode/Why can't I pause
		1743	reading?
		1744
		1745	Unlike, say, TCP, TLS connections do not consist of two independent
		1746	communication channels, one for each direction. Or put differently. The
		1747	read and write directions are not independent of each other: you cannot
		1748	write data unless you are also prepared to read, and vice versa.
		1749
		1750	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1751	callback invocations when you are not expecting any read data - the reason
		1752	is that AnyEvent::Handle always reads in TLS mode.
		1753
		1754	During the connection, you have to make sure that you always have a
		1755	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1756	connection (or when you no longer want to use it) you can call the
		1757	C<destroy> method.
		1758
		1759	=item How do I read data until the other side closes the connection?
		1760
		1761	If you just want to read your data into a perl scalar, the easiest way
		1762	to achieve this is by setting an C<on_read> callback that does nothing,
		1763	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1764	will be in C<$_[0]{rbuf}>:
		1765
		1766	$handle->on_read (sub { });
		1767	$handle->on_eof (undef);
		1768	$handle->on_error (sub {
		1769	my $data = delete $_[0]{rbuf};
		1770	});
		1771
		1772	The reason to use C<on_error> is that TCP connections, due to latencies
		1773	and packets loss, might get closed quite violently with an error, when in
		1774	fact, all data has been received.
		1775
		1776	It is usually better to use acknowledgements when transferring data,
		1777	to make sure the other side hasn't just died and you got the data
		1778	intact. This is also one reason why so many internet protocols have an
		1779	explicit QUIT command.
		1780
		1781	=item I don't want to destroy the handle too early - how do I wait until
		1782	all data has been written?
		1783
		1784	After writing your last bits of data, set the C<on_drain> callback
		1785	and destroy the handle in there - with the default setting of
		1786	C<low_water_mark> this will be called precisely when all data has been
		1787	written to the socket:
		1788
		1789	$handle->push_write (...);
		1790	$handle->on_drain (sub {
		1791	warn "all data submitted to the kernel\n";
		1792	undef $handle;
		1793	});
		1794
		1795	If you just want to queue some data and then signal EOF to the other side,
		1796	consider using C<< ->push_shutdown >> instead.
		1797
		1798	=item I want to contact a TLS/SSL server, I don't care about security.
		1799
		1800	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1801	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1802	parameter:
		1803
		1804	tcp_connect $host, $port, sub {
		1805	my ($fh) = @_;
		1806
		1807	my $handle = new AnyEvent::Handle
		1808	fh => $fh,
		1809	tls => "connect",
		1810	on_error => sub { ... };
		1811
		1812	$handle->push_write (...);
		1813	};
		1814
		1815	=item I want to contact a TLS/SSL server, I do care about security.
		1816
		1817	Then you should additionally enable certificate verification, including
		1818	peername verification, if the protocol you use supports it (see
		1819	L<AnyEvent::TLS>, C<verify_peername>).
		1820
		1821	E.g. for HTTPS:
		1822
		1823	tcp_connect $host, $port, sub {
		1824	my ($fh) = @_;
		1825
		1826	my $handle = new AnyEvent::Handle
		1827	fh => $fh,
		1828	peername => $host,
		1829	tls => "connect",
		1830	tls_ctx => { verify => 1, verify_peername => "https" },
		1831	...
		1832
		1833	Note that you must specify the hostname you connected to (or whatever
		1834	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1835	peername verification will be done.
		1836
		1837	The above will use the system-dependent default set of trusted CA
		1838	certificates. If you want to check against a specific CA, add the
		1839	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1840
		1841	tls_ctx => {
		1842	verify => 1,
		1843	verify_peername => "https",
		1844	ca_file => "my-ca-cert.pem",
		1845	},
		1846
		1847	=item I want to create a TLS/SSL server, how do I do that?
		1848
		1849	Well, you first need to get a server certificate and key. You have
		1850	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1851	self-signed certificate (cheap. check the search engine of your choice,
		1852	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1853	nice program for that purpose).
		1854
		1855	Then create a file with your private key (in PEM format, see
		1856	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1857	file should then look like this:
		1858
		1859	-----BEGIN RSA PRIVATE KEY-----
		1860	...header data
		1861	... lots of base64'y-stuff
		1862	-----END RSA PRIVATE KEY-----
		1863
		1864	-----BEGIN CERTIFICATE-----
		1865	... lots of base64'y-stuff
		1866	-----END CERTIFICATE-----
		1867
		1868	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		1869	specify this file as C<cert_file>:
		1870
		1871	tcp_server undef, $port, sub {
		1872	my ($fh) = @_;
		1873
		1874	my $handle = new AnyEvent::Handle
		1875	fh => $fh,
		1876	tls => "accept",
		1877	tls_ctx => { cert_file => "my-server-keycert.pem" },
		1878	...
		1879
		1880	When you have intermediate CA certificates that your clients might not
		1881	know about, just append them to the C<cert_file>.
		1882
		1883	=back
		1884
1468		1885
1469	=head1 SUBCLASSING AnyEvent::Handle	1886	=head1 SUBCLASSING AnyEvent::Handle
1470		1887
1471	In many cases, you might want to subclass AnyEvent::Handle.	1888	In many cases, you might want to subclass AnyEvent::Handle.
1472		1889

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.82 by root, Thu Aug 21 18:45:16 2008 UTC vs. Revision 1.158 by root, Fri Jul 24 08:40:35 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.82 by root, Thu Aug 21 18:45:16 2008 UTC vs.
Revision 1.158 by root, Fri Jul 24 08:40:35 2009 UTC