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Revision 1.92 by root, Wed Oct 1 08:52:06 2008 UTC vs.
Revision 1.174 by root, Sat Aug 8 20:52:06 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 = 4.3;	16	our $VERSION = 4.91;
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	$cv->recv;
47		45
48	=head1 DESCRIPTION	46	=head1 DESCRIPTION
49		47
50	This module is a helper module to make it easier to do event-based I/O on	48	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	49	filehandles.
52	on sockets see L<AnyEvent::Util>.
53		50
54	The L<AnyEvent::Intro> tutorial contains some well-documented	51	The L<AnyEvent::Intro> tutorial contains some well-documented
55	AnyEvent::Handle examples.	52	AnyEvent::Handle examples.
56		53
57	In the following, when the documentation refers to of "bytes" then this	54	In the following, when the documentation refers to of "bytes" then this
58	means characters. As sysread and syswrite are used for all I/O, their	55	means characters. As sysread and syswrite are used for all I/O, their
59	treatment of characters applies to this module as well.	56	treatment of characters applies to this module as well.
60		57
		58	At the very minimum, you should specify C<fh> or C<connect>, and the
		59	C<on_error> callback.
		60
61	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
62	argument.	62	argument.
63		63
64	=head2 SIGPIPE is not handled by this module
65
66	SIGPIPE is not handled by this module, so one of the practical
67	requirements of using it is to ignore SIGPIPE (C<$SIG{PIPE} =
68	'IGNORE'>). At least, this is highly recommend in a networked program: If
69	you use AnyEvent::Handle in a filter program (like sort), exiting on
70	SIGPIPE is probably the right thing to do.
71
72	=head1 METHODS	64	=head1 METHODS
73		65
74	=over 4	66	=over 4
75		67
76	=item B<new (%args)>	68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
77		69
78	The constructor supports these arguments (all as key => value pairs).	70	The constructor supports these arguments (all as C<< key => value >> pairs).
79		71
80	=over 4	72	=over 4
81		73
82	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
83		75
84	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
85
86	NOTE: The filehandle will be set to non-blocking mode (using	77	NOTE: The filehandle will be set to non-blocking mode (using
87	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	78	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
88	that mode.	79	that mode.
89		80
		81	=item connect => [$host, $service] [C<fh> or C<connect> MANDATORY]
		82
		83	Try to connect to the specified host and service (port), using
		84	C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the
		85	default C<peername>.
		86
		87	You have to specify either this parameter, or C<fh>, above.
		88
		89	It is possible to push requests on the read and write queues, and modify
		90	properties of the stream, even while AnyEvent::Handle is connecting.
		91
		92	When this parameter is specified, then the C<on_prepare>,
		93	C<on_connect_error> and C<on_connect> callbacks will be called under the
		94	appropriate circumstances:
		95
		96	=over 4
		97
90	=item on_eof => $cb->($handle)	98	=item on_prepare => $cb->($handle)
91		99
92	Set the callback to be called when an end-of-file condition is detected,	100	This (rarely used) callback is called before a new connection is
93	i.e. in the case of a socket, when the other side has closed the	101	attempted, but after the file handle has been created. It could be used to
94	connection cleanly.	102	prepare the file handle with parameters required for the actual connect
		103	(as opposed to settings that can be changed when the connection is already
		104	established).
95		105
96	For sockets, this just means that the other side has stopped sending data,	106	The return value of this callback should be the connect timeout value in
97	you can still try to write data, and, in fact, one can return from the eof	107	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
98	callback and continue writing data, as only the read part has been shut	108	timeout is to be used).
99	down.
100		109
101	While not mandatory, it is I<highly> recommended to set an eof callback,	110	=item on_connect => $cb->($handle, $host, $port, $retry->())
102	otherwise you might end up with a closed socket while you are still
103	waiting for data.
104		111
105	If an EOF condition has been detected but no C<on_eof> callback has been	112	This callback is called when a connection has been successfully established.
106	set, then a fatal error will be raised with C<$!> set to <0>.
107		113
		114	The actual numeric host and port (the socket peername) are passed as
		115	parameters, together with a retry callback.
		116
		117	When, for some reason, the handle is not acceptable, then calling
		118	C<$retry> will continue with the next conenction target (in case of
		119	multi-homed hosts or SRV records there can be multiple connection
		120	endpoints). When it is called then the read and write queues, eof status,
		121	tls status and similar properties of the handle are being reset.
		122
		123	In most cases, ignoring the C<$retry> parameter is the way to go.
		124
		125	=item on_connect_error => $cb->($handle, $message)
		126
		127	This callback is called when the conenction could not be
		128	established. C<$!> will contain the relevant error code, and C<$message> a
		129	message describing it (usually the same as C<"$!">).
		130
		131	If this callback isn't specified, then C<on_error> will be called with a
		132	fatal error instead.
		133
		134	=back
		135
108	=item on_error => $cb->($handle, $fatal)	136	=item on_error => $cb->($handle, $fatal, $message)
109		137
110	This is the error callback, which is called when, well, some error	138	This is the error callback, which is called when, well, some error
111	occured, such as not being able to resolve the hostname, failure to	139	occured, such as not being able to resolve the hostname, failure to
112	connect or a read error.	140	connect or a read error.
113		141
114	Some errors are fatal (which is indicated by C<$fatal> being true). On	142	Some errors are fatal (which is indicated by C<$fatal> being true). On
115	fatal errors the handle object will be shut down and will not be usable	143	fatal errors the handle object will be destroyed (by a call to C<< ->
116	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal	144	destroy >>) after invoking the error callback (which means you are free to
117	errors are an EOF condition with active (but unsatisifable) read watchers	145	examine the handle object). Examples of fatal errors are an EOF condition
118	(C<EPIPE>) or I/O errors.	146	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		147	cases where the other side can close the connection at their will it is
		148	often easiest to not report C<EPIPE> errors in this callback.
		149
		150	AnyEvent::Handle tries to find an appropriate error code for you to check
		151	against, but in some cases (TLS errors), this does not work well. It is
		152	recommended to always output the C<$message> argument in human-readable
		153	error messages (it's usually the same as C<"$!">).
119		154
120	Non-fatal errors can be retried by simply returning, but it is recommended	155	Non-fatal errors can be retried by simply returning, but it is recommended
121	to simply ignore this parameter and instead abondon the handle object	156	to simply ignore this parameter and instead abondon the handle object
122	when this callback is invoked. Examples of non-fatal errors are timeouts	157	when this callback is invoked. Examples of non-fatal errors are timeouts
123	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	158	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
124		159
125	On callback entrance, the value of C<$!> contains the operating system	160	On callback entrance, the value of C<$!> contains the operating system
126	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	161	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		162	C<EPROTO>).
127		163
128	While not mandatory, it is I<highly> recommended to set this callback, as	164	While not mandatory, it is I<highly> recommended to set this callback, as
129	you will not be notified of errors otherwise. The default simply calls	165	you will not be notified of errors otherwise. The default simply calls
130	C<croak>.	166	C<croak>.
131		167
…		…
135	and no read request is in the queue (unlike read queue callbacks, this	171	and no read request is in the queue (unlike read queue callbacks, this
136	callback will only be called when at least one octet of data is in the	172	callback will only be called when at least one octet of data is in the
137	read buffer).	173	read buffer).
138		174
139	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	175	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
140	method or access the C<$handle->{rbuf}> member directly.	176	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		177	must not enlarge or modify the read buffer, you can only remove data at
		178	the beginning from it.
141		179
142	When an EOF condition is detected then AnyEvent::Handle will first try to	180	When an EOF condition is detected then AnyEvent::Handle will first try to
143	feed all the remaining data to the queued callbacks and C<on_read> before	181	feed all the remaining data to the queued callbacks and C<on_read> before
144	calling the C<on_eof> callback. If no progress can be made, then a fatal	182	calling the C<on_eof> callback. If no progress can be made, then a fatal
145	error will be raised (with C<$!> set to C<EPIPE>).	183	error will be raised (with C<$!> set to C<EPIPE>).
		184
		185	Note that, unlike requests in the read queue, an C<on_read> callback
		186	doesn't mean you I<require> some data: if there is an EOF and there
		187	are outstanding read requests then an error will be flagged. With an
		188	C<on_read> callback, the C<on_eof> callback will be invoked.
		189
		190	=item on_eof => $cb->($handle)
		191
		192	Set the callback to be called when an end-of-file condition is detected,
		193	i.e. in the case of a socket, when the other side has closed the
		194	connection cleanly, and there are no outstanding read requests in the
		195	queue (if there are read requests, then an EOF counts as an unexpected
		196	connection close and will be flagged as an error).
		197
		198	For sockets, this just means that the other side has stopped sending data,
		199	you can still try to write data, and, in fact, one can return from the EOF
		200	callback and continue writing data, as only the read part has been shut
		201	down.
		202
		203	If an EOF condition has been detected but no C<on_eof> callback has been
		204	set, then a fatal error will be raised with C<$!> set to <0>.
146		205
147	=item on_drain => $cb->($handle)	206	=item on_drain => $cb->($handle)
148		207
149	This sets the callback that is called when the write buffer becomes empty	208	This sets the callback that is called when the write buffer becomes empty
150	(or when the callback is set and the buffer is empty already).	209	(or when the callback is set and the buffer is empty already).
…		…
240	write data and will install a watcher that will write this data to the	299	write data and will install a watcher that will write this data to the
241	socket. No errors will be reported (this mostly matches how the operating	300	socket. No errors will be reported (this mostly matches how the operating
242	system treats outstanding data at socket close time).	301	system treats outstanding data at socket close time).
243		302
244	This will not work for partial TLS data that could not be encoded	303	This will not work for partial TLS data that could not be encoded
245	yet. This data will be lost.	304	yet. This data will be lost. Calling the C<stoptls> method in time might
		305	help.
		306
		307	=item peername => $string
		308
		309	A string used to identify the remote site - usually the DNS hostname
		310	(I<not> IDN!) used to create the connection, rarely the IP address.
		311
		312	Apart from being useful in error messages, this string is also used in TLS
		313	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		314	verification will be skipped when C<peername> is not specified or
		315	C<undef>.
246		316
247	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	317	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
248		318
249	When this parameter is given, it enables TLS (SSL) mode, that means	319	When this parameter is given, it enables TLS (SSL) mode, that means
250	AnyEvent will start a TLS handshake as soon as the conenction has been	320	AnyEvent will start a TLS handshake as soon as the conenction has been
251	established and will transparently encrypt/decrypt data afterwards.	321	established and will transparently encrypt/decrypt data afterwards.
		322
		323	All TLS protocol errors will be signalled as C<EPROTO>, with an
		324	appropriate error message.
252		325
253	TLS mode requires Net::SSLeay to be installed (it will be loaded	326	TLS mode requires Net::SSLeay to be installed (it will be loaded
254	automatically when you try to create a TLS handle): this module doesn't	327	automatically when you try to create a TLS handle): this module doesn't
255	have a dependency on that module, so if your module requires it, you have	328	have a dependency on that module, so if your module requires it, you have
256	to add the dependency yourself.	329	to add the dependency yourself.
…		…
260	mode.	333	mode.
261		334
262	You can also provide your own TLS connection object, but you have	335	You can also provide your own TLS connection object, but you have
263	to make sure that you call either C<Net::SSLeay::set_connect_state>	336	to make sure that you call either C<Net::SSLeay::set_connect_state>
264	or C<Net::SSLeay::set_accept_state> on it before you pass it to	337	or C<Net::SSLeay::set_accept_state> on it before you pass it to
265	AnyEvent::Handle.	338	AnyEvent::Handle. Also, this module will take ownership of this connection
		339	object.
		340
		341	At some future point, AnyEvent::Handle might switch to another TLS
		342	implementation, then the option to use your own session object will go
		343	away.
		344
		345	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		346	passing in the wrong integer will lead to certain crash. This most often
		347	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		348	segmentation fault.
266		349
267	See the C<< ->starttls >> method for when need to start TLS negotiation later.	350	See the C<< ->starttls >> method for when need to start TLS negotiation later.
268		351
269	=item tls_ctx => $ssl_ctx	352	=item tls_ctx => $anyevent_tls
270		353
271	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection	354	Use the given C<AnyEvent::TLS> object to create the new TLS connection
272	(unless a connection object was specified directly). If this parameter is	355	(unless a connection object was specified directly). If this parameter is
273	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	356	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		357
		358	Instead of an object, you can also specify a hash reference with C<< key
		359	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		360	new TLS context object.
		361
		362	=item on_starttls => $cb->($handle, $success[, $error_message])
		363
		364	This callback will be invoked when the TLS/SSL handshake has finished. If
		365	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		366	(C<on_stoptls> will not be called in this case).
		367
		368	The session in C<< $handle->{tls} >> can still be examined in this
		369	callback, even when the handshake was not successful.
		370
		371	TLS handshake failures will not cause C<on_error> to be invoked when this
		372	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		373
		374	Without this callback, handshake failures lead to C<on_error> being
		375	called, as normal.
		376
		377	Note that you cannot call C<starttls> right again in this callback. If you
		378	need to do that, start an zero-second timer instead whose callback can
		379	then call C<< ->starttls >> again.
		380
		381	=item on_stoptls => $cb->($handle)
		382
		383	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		384	set, then it will be invoked after freeing the TLS session. If it is not,
		385	then a TLS shutdown condition will be treated like a normal EOF condition
		386	on the handle.
		387
		388	The session in C<< $handle->{tls} >> can still be examined in this
		389	callback.
		390
		391	This callback will only be called on TLS shutdowns, not when the
		392	underlying handle signals EOF.
274		393
275	=item json => JSON or JSON::XS object	394	=item json => JSON or JSON::XS object
276		395
277	This is the json coder object used by the C<json> read and write types.	396	This is the json coder object used by the C<json> read and write types.
278		397
…		…
281	texts.	400	texts.
282		401
283	Note that you are responsible to depend on the JSON module if you want to	402	Note that you are responsible to depend on the JSON module if you want to
284	use this functionality, as AnyEvent does not have a dependency itself.	403	use this functionality, as AnyEvent does not have a dependency itself.
285		404
286	=item filter_r => $cb
287
288	=item filter_w => $cb
289
290	These exist, but are undocumented at this time. (They are used internally
291	by the TLS code).
292
293	=back	405	=back
294		406
295	=cut	407	=cut
296		408
297	sub new {	409	sub new {
298	my $class = shift;	410	my $class = shift;
299
300	my $self = bless { @_ }, $class;	411	my $self = bless { @_ }, $class;
301		412
302	$self->{fh} or Carp::croak "mandatory argument fh is missing";	413	if ($self->{fh}) {
		414	$self->_start;
		415	return unless $self->{fh}; # could be gone by now
		416
		417	} elsif ($self->{connect}) {
		418	require AnyEvent::Socket;
		419
		420	$self->{peername} = $self->{connect}[0]
		421	unless exists $self->{peername};
		422
		423	$self->{_skip_drain_rbuf} = 1;
		424
		425	{
		426	Scalar::Util::weaken (my $self = $self);
		427
		428	$self->{_connect} =
		429	AnyEvent::Socket::tcp_connect (
		430	$self->{connect}[0],
		431	$self->{connect}[1],
		432	sub {
		433	my ($fh, $host, $port, $retry) = @_;
		434
		435	if ($fh) {
		436	$self->{fh} = $fh;
		437
		438	delete $self->{_skip_drain_rbuf};
		439	$self->_start;
		440
		441	$self->{on_connect}
		442	and $self->{on_connect}($self, $host, $port, sub {
		443	delete @$self{qw(fh _tw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		444	$self->{_skip_drain_rbuf} = 1;
		445	&$retry;
		446	});
		447
		448	} else {
		449	if ($self->{on_connect_error}) {
		450	$self->{on_connect_error}($self, "$!");
		451	$self->destroy;
		452	} else {
		453	$self->_error ($!, 1);
		454	}
		455	}
		456	},
		457	sub {
		458	local $self->{fh} = $_[0];
		459
		460	$self->{on_prepare}
		461	? $self->{on_prepare}->($self)
		462	: ()
		463	}
		464	);
		465	}
		466
		467	} else {
		468	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		469	}
		470
		471	$self
		472	}
		473
		474	sub _start {
		475	my ($self) = @_;
303		476
304	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	477	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
305
306	if ($self->{tls}) {
307	require Net::SSLeay;
308	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
309	}
310		478
311	$self->{_activity} = AnyEvent->now;	479	$self->{_activity} = AnyEvent->now;
312	$self->_timeout;	480	$self->_timeout;
313		481
314	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
315	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};	482	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
316		483
		484	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		485	if $self->{tls};
		486
		487	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
		488
317	$self->start_read	489	$self->start_read
318	if $self->{on_read};	490	if $self->{on_read} || @{ $self->{_queue} };
319		491
320	$self	492	$self->_drain_wbuf;
321	}	493	}
322		494
323	sub _shutdown {	495	#sub _shutdown {
324	my ($self) = @_;	496	# my ($self) = @_;
325		497	#
326	delete $self->{_tw};	498	# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
327	delete $self->{_rw};	499	# $self->{_eof} = 1; # tell starttls et. al to stop trying
328	delete $self->{_ww};	500	#
329	delete $self->{fh};
330
331	&_freetls;	501	# &_freetls;
332		502	#}
333	delete $self->{on_read};
334	delete $self->{_queue};
335	}
336		503
337	sub _error {	504	sub _error {
338	my ($self, $errno, $fatal) = @_;	505	my ($self, $errno, $fatal, $message) = @_;
339
340	$self->_shutdown
341	if $fatal;
342		506
343	$! = $errno;	507	$! = $errno;
		508	$message ||= "$!";
344		509
345	if ($self->{on_error}) {	510	if ($self->{on_error}) {
346	$self->{on_error}($self, $fatal);	511	$self->{on_error}($self, $fatal, $message);
347	} else {	512	$self->destroy if $fatal;
		513	} elsif ($self->{fh}) {
		514	$self->destroy;
348	Carp::croak "AnyEvent::Handle uncaught error: $!";	515	Carp::croak "AnyEvent::Handle uncaught error: $message";
349	}	516	}
350	}	517	}
351		518
352	=item $fh = $handle->fh	519	=item $fh = $handle->fh
353		520
…		…
390	}	557	}
391		558
392	=item $handle->autocork ($boolean)	559	=item $handle->autocork ($boolean)
393		560
394	Enables or disables the current autocork behaviour (see C<autocork>	561	Enables or disables the current autocork behaviour (see C<autocork>
395	constructor argument).	562	constructor argument). Changes will only take effect on the next write.
396		563
397	=cut	564	=cut
		565
		566	sub autocork {
		567	$_[0]{autocork} = $_[1];
		568	}
398		569
399	=item $handle->no_delay ($boolean)	570	=item $handle->no_delay ($boolean)
400		571
401	Enables or disables the C<no_delay> setting (see constructor argument of	572	Enables or disables the C<no_delay> setting (see constructor argument of
402	the same name for details).	573	the same name for details).
…		…
406	sub no_delay {	577	sub no_delay {
407	$_[0]{no_delay} = $_[1];	578	$_[0]{no_delay} = $_[1];
408		579
409	eval {	580	eval {
410	local $SIG{__DIE__};	581	local $SIG{__DIE__};
411	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	582	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]
		583	if $_[0]{fh};
412	};	584	};
		585	}
		586
		587	=item $handle->on_starttls ($cb)
		588
		589	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		590
		591	=cut
		592
		593	sub on_starttls {
		594	$_[0]{on_starttls} = $_[1];
		595	}
		596
		597	=item $handle->on_stoptls ($cb)
		598
		599	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		600
		601	=cut
		602
		603	sub on_starttls {
		604	$_[0]{on_stoptls} = $_[1];
		605	}
		606
		607	=item $handle->rbuf_max ($max_octets)
		608
		609	Configures the C<rbuf_max> setting (C<undef> disables it).
		610
		611	=cut
		612
		613	sub rbuf_max {
		614	$_[0]{rbuf_max} = $_[1];
413	}	615	}
414		616
415	#############################################################################	617	#############################################################################
416		618
417	=item $handle->timeout ($seconds)	619	=item $handle->timeout ($seconds)
…		…
422		624
423	sub timeout {	625	sub timeout {
424	my ($self, $timeout) = @_;	626	my ($self, $timeout) = @_;
425		627
426	$self->{timeout} = $timeout;	628	$self->{timeout} = $timeout;
		629	delete $self->{_tw};
427	$self->_timeout;	630	$self->_timeout;
428	}	631	}
429		632
430	# reset the timeout watcher, as neccessary	633	# reset the timeout watcher, as neccessary
431	# also check for time-outs	634	# also check for time-outs
432	sub _timeout {	635	sub _timeout {
433	my ($self) = @_;	636	my ($self) = @_;
434		637
435	if ($self->{timeout}) {	638	if ($self->{timeout} && $self->{fh}) {
436	my $NOW = AnyEvent->now;	639	my $NOW = AnyEvent->now;
437		640
438	# when would the timeout trigger?	641	# when would the timeout trigger?
439	my $after = $self->{_activity} + $self->{timeout} - $NOW;	642	my $after = $self->{_activity} + $self->{timeout} - $NOW;
440		643
…		…
443	$self->{_activity} = $NOW;	646	$self->{_activity} = $NOW;
444		647
445	if ($self->{on_timeout}) {	648	if ($self->{on_timeout}) {
446	$self->{on_timeout}($self);	649	$self->{on_timeout}($self);
447	} else {	650	} else {
448	$self->_error (&Errno::ETIMEDOUT);	651	$self->_error (Errno::ETIMEDOUT);
449	}	652	}
450		653
451	# callback could have changed timeout value, optimise	654	# callback could have changed timeout value, optimise
452	return unless $self->{timeout};	655	return unless $self->{timeout};
453		656
…		…
495	my ($self, $cb) = @_;	698	my ($self, $cb) = @_;
496		699
497	$self->{on_drain} = $cb;	700	$self->{on_drain} = $cb;
498		701
499	$cb->($self)	702	$cb->($self)
500	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	703	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
501	}	704	}
502		705
503	=item $handle->push_write ($data)	706	=item $handle->push_write ($data)
504		707
505	Queues the given scalar to be written. You can push as much data as you	708	Queues the given scalar to be written. You can push as much data as you
…		…
516	Scalar::Util::weaken $self;	719	Scalar::Util::weaken $self;
517		720
518	my $cb = sub {	721	my $cb = sub {
519	my $len = syswrite $self->{fh}, $self->{wbuf};	722	my $len = syswrite $self->{fh}, $self->{wbuf};
520		723
521	if ($len >= 0) {	724	if (defined $len) {
522	substr $self->{wbuf}, 0, $len, "";	725	substr $self->{wbuf}, 0, $len, "";
523		726
524	$self->{_activity} = AnyEvent->now;	727	$self->{_activity} = AnyEvent->now;
525		728
526	$self->{on_drain}($self)	729	$self->{on_drain}($self)
527	if $self->{low_water_mark} >= length $self->{wbuf}	730	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
528	&& $self->{on_drain};	731	&& $self->{on_drain};
529		732
530	delete $self->{_ww} unless length $self->{wbuf};	733	delete $self->{_ww} unless length $self->{wbuf};
531	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	734	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
532	$self->_error ($!, 1);	735	$self->_error ($!, 1);
…		…
556		759
557	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	760	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
558	->($self, @_);	761	->($self, @_);
559	}	762	}
560		763
561	if ($self->{filter_w}) {	764	if ($self->{tls}) {
562	$self->{filter_w}($self, \$_[0]);	765	$self->{_tls_wbuf} .= $_[0];
		766	&_dotls ($self) if $self->{fh};
563	} else {	767	} else {
564	$self->{wbuf} .= $_[0];	768	$self->{wbuf} .= $_[0];
565	$self->_drain_wbuf;	769	$self->_drain_wbuf if $self->{fh};
566	}	770	}
567	}	771	}
568		772
569	=item $handle->push_write (type => @args)	773	=item $handle->push_write (type => @args)
570		774
…		…
584	=cut	788	=cut
585		789
586	register_write_type netstring => sub {	790	register_write_type netstring => sub {
587	my ($self, $string) = @_;	791	my ($self, $string) = @_;
588		792
589	sprintf "%d:%s,", (length $string), $string	793	(length $string) . ":$string,"
590	};	794	};
591		795
592	=item packstring => $format, $data	796	=item packstring => $format, $data
593		797
594	An octet string prefixed with an encoded length. The encoding C<$format>	798	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
659		863
660	pack "w/a*", Storable::nfreeze ($ref)	864	pack "w/a*", Storable::nfreeze ($ref)
661	};	865	};
662		866
663	=back	867	=back
		868
		869	=item $handle->push_shutdown
		870
		871	Sometimes you know you want to close the socket after writing your data
		872	before it was actually written. One way to do that is to replace your
		873	C<on_drain> handler by a callback that shuts down the socket (and set
		874	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		875	replaces the C<on_drain> callback with:
		876
		877	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		878
		879	This simply shuts down the write side and signals an EOF condition to the
		880	the peer.
		881
		882	You can rely on the normal read queue and C<on_eof> handling
		883	afterwards. This is the cleanest way to close a connection.
		884
		885	=cut
		886
		887	sub push_shutdown {
		888	my ($self) = @_;
		889
		890	delete $self->{low_water_mark};
		891	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		892	}
664		893
665	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	894	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
666		895
667	This function (not method) lets you add your own types to C<push_write>.	896	This function (not method) lets you add your own types to C<push_write>.
668	Whenever the given C<type> is used, C<push_write> will invoke the code	897	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
762	=cut	991	=cut
763		992
764	sub _drain_rbuf {	993	sub _drain_rbuf {
765	my ($self) = @_;	994	my ($self) = @_;
766		995
		996	# avoid recursion
		997	return if $self->{_skip_drain_rbuf};
767	local $self->{_in_drain} = 1;	998	local $self->{_skip_drain_rbuf} = 1;
768
769	if (
770	defined $self->{rbuf_max}
771	&& $self->{rbuf_max} < length $self->{rbuf}
772	) {
773	$self->_error (&Errno::ENOSPC, 1), return;
774	}
775		999
776	while () {	1000	while () {
		1001	# we need to use a separate tls read buffer, as we must not receive data while
		1002	# we are draining the buffer, and this can only happen with TLS.
		1003	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1004	if exists $self->{_tls_rbuf};
		1005
777	my $len = length $self->{rbuf};	1006	my $len = length $self->{rbuf};
778		1007
779	if (my $cb = shift @{ $self->{_queue} }) {	1008	if (my $cb = shift @{ $self->{_queue} }) {
780	unless ($cb->($self)) {	1009	unless ($cb->($self)) {
781	if ($self->{_eof}) {	1010	# no progress can be made
782	# no progress can be made (not enough data and no data forthcoming)	1011	# (not enough data and no data forthcoming)
783	$self->_error (&Errno::EPIPE, 1), return;	1012	$self->_error (Errno::EPIPE, 1), return
784	}	1013	if $self->{_eof};
785		1014
786	unshift @{ $self->{_queue} }, $cb;	1015	unshift @{ $self->{_queue} }, $cb;
787	last;	1016	last;
788	}	1017	}
789	} elsif ($self->{on_read}) {	1018	} elsif ($self->{on_read}) {
…		…
796	&& !@{ $self->{_queue} } # and the queue is still empty	1025	&& !@{ $self->{_queue} } # and the queue is still empty
797	&& $self->{on_read} # but we still have on_read	1026	&& $self->{on_read} # but we still have on_read
798	) {	1027	) {
799	# no further data will arrive	1028	# no further data will arrive
800	# so no progress can be made	1029	# so no progress can be made
801	$self->_error (&Errno::EPIPE, 1), return	1030	$self->_error (Errno::EPIPE, 1), return
802	if $self->{_eof};	1031	if $self->{_eof};
803		1032
804	last; # more data might arrive	1033	last; # more data might arrive
805	}	1034	}
806	} else {	1035	} else {
807	# read side becomes idle	1036	# read side becomes idle
808	delete $self->{_rw};	1037	delete $self->{_rw} unless $self->{tls};
809	last;	1038	last;
810	}	1039	}
811	}	1040	}
812		1041
813	if ($self->{_eof}) {	1042	if ($self->{_eof}) {
814	if ($self->{on_eof}) {	1043	$self->{on_eof}
815	$self->{on_eof}($self)	1044	? $self->{on_eof}($self)
816	} else {	1045	: $self->_error (0, 1, "Unexpected end-of-file");
817	$self->_error (0, 1);	1046
818	}	1047	return;
		1048	}
		1049
		1050	if (
		1051	defined $self->{rbuf_max}
		1052	&& $self->{rbuf_max} < length $self->{rbuf}
		1053	) {
		1054	$self->_error (Errno::ENOSPC, 1), return;
819	}	1055	}
820		1056
821	# may need to restart read watcher	1057	# may need to restart read watcher
822	unless ($self->{_rw}) {	1058	unless ($self->{_rw}) {
823	$self->start_read	1059	$self->start_read
…		…
835		1071
836	sub on_read {	1072	sub on_read {
837	my ($self, $cb) = @_;	1073	my ($self, $cb) = @_;
838		1074
839	$self->{on_read} = $cb;	1075	$self->{on_read} = $cb;
840	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1076	$self->_drain_rbuf if $cb;
841	}	1077	}
842		1078
843	=item $handle->rbuf	1079	=item $handle->rbuf
844		1080
845	Returns the read buffer (as a modifiable lvalue).	1081	Returns the read buffer (as a modifiable lvalue).
846		1082
847	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1083	You can access the read buffer directly as the C<< ->{rbuf} >>
848	you want.	1084	member, if you want. However, the only operation allowed on the
		1085	read buffer (apart from looking at it) is removing data from its
		1086	beginning. Otherwise modifying or appending to it is not allowed and will
		1087	lead to hard-to-track-down bugs.
849		1088
850	NOTE: The read buffer should only be used or modified if the C<on_read>,	1089	NOTE: The read buffer should only be used or modified if the C<on_read>,
851	C<push_read> or C<unshift_read> methods are used. The other read methods	1090	C<push_read> or C<unshift_read> methods are used. The other read methods
852	automatically manage the read buffer.	1091	automatically manage the read buffer.
853		1092
…		…
894	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1133	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
895	->($self, $cb, @_);	1134	->($self, $cb, @_);
896	}	1135	}
897		1136
898	push @{ $self->{_queue} }, $cb;	1137	push @{ $self->{_queue} }, $cb;
899	$self->_drain_rbuf unless $self->{_in_drain};	1138	$self->_drain_rbuf;
900	}	1139	}
901		1140
902	sub unshift_read {	1141	sub unshift_read {
903	my $self = shift;	1142	my $self = shift;
904	my $cb = pop;	1143	my $cb = pop;
…		…
910	->($self, $cb, @_);	1149	->($self, $cb, @_);
911	}	1150	}
912		1151
913		1152
914	unshift @{ $self->{_queue} }, $cb;	1153	unshift @{ $self->{_queue} }, $cb;
915	$self->_drain_rbuf unless $self->{_in_drain};	1154	$self->_drain_rbuf;
916	}	1155	}
917		1156
918	=item $handle->push_read (type => @args, $cb)	1157	=item $handle->push_read (type => @args, $cb)
919		1158
920	=item $handle->unshift_read (type => @args, $cb)	1159	=item $handle->unshift_read (type => @args, $cb)
…		…
1053	return 1;	1292	return 1;
1054	}	1293	}
1055		1294
1056	# reject	1295	# reject
1057	if ($reject && $$rbuf =~ $reject) {	1296	if ($reject && $$rbuf =~ $reject) {
1058	$self->_error (&Errno::EBADMSG);	1297	$self->_error (Errno::EBADMSG);
1059	}	1298	}
1060		1299
1061	# skip	1300	# skip
1062	if ($skip && $$rbuf =~ $skip) {	1301	if ($skip && $$rbuf =~ $skip) {
1063	$data .= substr $$rbuf, 0, $+[0], "";	1302	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1079	my ($self, $cb) = @_;	1318	my ($self, $cb) = @_;
1080		1319
1081	sub {	1320	sub {
1082	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1321	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1083	if ($_[0]{rbuf} =~ /[^0-9]/) {	1322	if ($_[0]{rbuf} =~ /[^0-9]/) {
1084	$self->_error (&Errno::EBADMSG);	1323	$self->_error (Errno::EBADMSG);
1085	}	1324	}
1086	return;	1325	return;
1087	}	1326	}
1088		1327
1089	my $len = $1;	1328	my $len = $1;
…		…
1092	my $string = $_[1];	1331	my $string = $_[1];
1093	$_[0]->unshift_read (chunk => 1, sub {	1332	$_[0]->unshift_read (chunk => 1, sub {
1094	if ($_[1] eq ",") {	1333	if ($_[1] eq ",") {
1095	$cb->($_[0], $string);	1334	$cb->($_[0], $string);
1096	} else {	1335	} else {
1097	$self->_error (&Errno::EBADMSG);	1336	$self->_error (Errno::EBADMSG);
1098	}	1337	}
1099	});	1338	});
1100	});	1339	});
1101		1340
1102	1	1341	1
…		…
1108	An octet string prefixed with an encoded length. The encoding C<$format>	1347	An octet string prefixed with an encoded length. The encoding C<$format>
1109	uses the same format as a Perl C<pack> format, but must specify a single	1348	uses the same format as a Perl C<pack> format, but must specify a single
1110	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1349	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1111	optional C<!>, C<< < >> or C<< > >> modifier).	1350	optional C<!>, C<< < >> or C<< > >> modifier).
1112		1351
1113	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1352	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1353	EPP uses a prefix of C<N> (4 octtes).
1114		1354
1115	Example: read a block of data prefixed by its length in BER-encoded	1355	Example: read a block of data prefixed by its length in BER-encoded
1116	format (very efficient).	1356	format (very efficient).
1117		1357
1118	$handle->push_read (packstring => "w", sub {	1358	$handle->push_read (packstring => "w", sub {
…		…
1148	}	1388	}
1149	};	1389	};
1150		1390
1151	=item json => $cb->($handle, $hash_or_arrayref)	1391	=item json => $cb->($handle, $hash_or_arrayref)
1152		1392
1153	Reads a JSON object or array, decodes it and passes it to the callback.	1393	Reads a JSON object or array, decodes it and passes it to the
		1394	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1154		1395
1155	If a C<json> object was passed to the constructor, then that will be used	1396	If a C<json> object was passed to the constructor, then that will be used
1156	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1397	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1157		1398
1158	This read type uses the incremental parser available with JSON version	1399	This read type uses the incremental parser available with JSON version
…		…
1167	=cut	1408	=cut
1168		1409
1169	register_read_type json => sub {	1410	register_read_type json => sub {
1170	my ($self, $cb) = @_;	1411	my ($self, $cb) = @_;
1171		1412
1172	require JSON;	1413	my $json = $self->{json} ||=
		1414	eval { require JSON::XS; JSON::XS->new->utf8 }
		1415	|| do { require JSON; JSON->new->utf8 };
1173		1416
1174	my $data;	1417	my $data;
1175	my $rbuf = \$self->{rbuf};	1418	my $rbuf = \$self->{rbuf};
1176		1419
1177	my $json = $self->{json} ||= JSON->new->utf8;
1178
1179	sub {	1420	sub {
1180	my $ref = $json->incr_parse ($self->{rbuf});	1421	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1181		1422
1182	if ($ref) {	1423	if ($ref) {
1183	$self->{rbuf} = $json->incr_text;	1424	$self->{rbuf} = $json->incr_text;
1184	$json->incr_text = "";	1425	$json->incr_text = "";
1185	$cb->($self, $ref);	1426	$cb->($self, $ref);
1186		1427
1187	1	1428	1
		1429	} elsif ($@) {
		1430	# error case
		1431	$json->incr_skip;
		1432
		1433	$self->{rbuf} = $json->incr_text;
		1434	$json->incr_text = "";
		1435
		1436	$self->_error (Errno::EBADMSG);
		1437
		1438	()
1188	} else {	1439	} else {
1189	$self->{rbuf} = "";	1440	$self->{rbuf} = "";
		1441
1190	()	1442	()
1191	}	1443	}
1192	}	1444	}
1193	};	1445	};
1194		1446
…		…
1226	# read remaining chunk	1478	# read remaining chunk
1227	$_[0]->unshift_read (chunk => $len, sub {	1479	$_[0]->unshift_read (chunk => $len, sub {
1228	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1480	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1229	$cb->($_[0], $ref);	1481	$cb->($_[0], $ref);
1230	} else {	1482	} else {
1231	$self->_error (&Errno::EBADMSG);	1483	$self->_error (Errno::EBADMSG);
1232	}	1484	}
1233	});	1485	});
1234	}	1486	}
1235		1487
1236	1	1488	1
…		…
1271	Note that AnyEvent::Handle will automatically C<start_read> for you when	1523	Note that AnyEvent::Handle will automatically C<start_read> for you when
1272	you change the C<on_read> callback or push/unshift a read callback, and it	1524	you change the C<on_read> callback or push/unshift a read callback, and it
1273	will automatically C<stop_read> for you when neither C<on_read> is set nor	1525	will automatically C<stop_read> for you when neither C<on_read> is set nor
1274	there are any read requests in the queue.	1526	there are any read requests in the queue.
1275		1527
		1528	These methods will have no effect when in TLS mode (as TLS doesn't support
		1529	half-duplex connections).
		1530
1276	=cut	1531	=cut
1277		1532
1278	sub stop_read {	1533	sub stop_read {
1279	my ($self) = @_;	1534	my ($self) = @_;
1280		1535
1281	delete $self->{_rw};	1536	delete $self->{_rw} unless $self->{tls};
1282	}	1537	}
1283		1538
1284	sub start_read {	1539	sub start_read {
1285	my ($self) = @_;	1540	my ($self) = @_;
1286		1541
1287	unless ($self->{_rw} || $self->{_eof}) {	1542	unless ($self->{_rw} || $self->{_eof}) {
1288	Scalar::Util::weaken $self;	1543	Scalar::Util::weaken $self;
1289		1544
1290	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1545	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1291	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1546	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1292	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1547	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1293		1548
1294	if ($len > 0) {	1549	if ($len > 0) {
1295	$self->{_activity} = AnyEvent->now;	1550	$self->{_activity} = AnyEvent->now;
1296		1551
1297	$self->{filter_r}	1552	if ($self->{tls}) {
1298	? $self->{filter_r}($self, $rbuf)	1553	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1299	: $self->{_in_drain} || $self->_drain_rbuf;	1554
		1555	&_dotls ($self);
		1556	} else {
		1557	$self->_drain_rbuf;
		1558	}
1300		1559
1301	} elsif (defined $len) {	1560	} elsif (defined $len) {
1302	delete $self->{_rw};	1561	delete $self->{_rw};
1303	$self->{_eof} = 1;	1562	$self->{_eof} = 1;
1304	$self->_drain_rbuf unless $self->{_in_drain};	1563	$self->_drain_rbuf;
1305		1564
1306	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1565	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1307	return $self->_error ($!, 1);	1566	return $self->_error ($!, 1);
1308	}	1567	}
1309	});	1568	});
1310	}	1569	}
1311	}	1570	}
1312		1571
		1572	our $ERROR_SYSCALL;
		1573	our $ERROR_WANT_READ;
		1574
		1575	sub _tls_error {
		1576	my ($self, $err) = @_;
		1577
		1578	return $self->_error ($!, 1)
		1579	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1580
		1581	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1582
		1583	# reduce error string to look less scary
		1584	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1585
		1586	if ($self->{_on_starttls}) {
		1587	(delete $self->{_on_starttls})->($self, undef, $err);
		1588	&_freetls;
		1589	} else {
		1590	&_freetls;
		1591	$self->_error (Errno::EPROTO, 1, $err);
		1592	}
		1593	}
		1594
		1595	# poll the write BIO and send the data if applicable
		1596	# also decode read data if possible
		1597	# this is basiclaly our TLS state machine
		1598	# more efficient implementations are possible with openssl,
		1599	# but not with the buggy and incomplete Net::SSLeay.
1313	sub _dotls {	1600	sub _dotls {
1314	my ($self) = @_;	1601	my ($self) = @_;
1315		1602
1316	my $buf;	1603	my $tmp;
1317		1604
1318	if (length $self->{_tls_wbuf}) {	1605	if (length $self->{_tls_wbuf}) {
1319	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1606	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1320	substr $self->{_tls_wbuf}, 0, $len, "";	1607	substr $self->{_tls_wbuf}, 0, $tmp, "";
1321	}	1608	}
1322	}
1323		1609
		1610	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1611	return $self->_tls_error ($tmp)
		1612	if $tmp != $ERROR_WANT_READ
		1613	&& ($tmp != $ERROR_SYSCALL || $!);
		1614	}
		1615
1324	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1616	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1325	unless (length $buf) {	1617	unless (length $tmp) {
1326	# let's treat SSL-eof as we treat normal EOF	1618	$self->{_on_starttls}
1327	delete $self->{_rw};	1619	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1328	$self->{_eof} = 1;
1329	&_freetls;	1620	&_freetls;
		1621
		1622	if ($self->{on_stoptls}) {
		1623	$self->{on_stoptls}($self);
		1624	return;
		1625	} else {
		1626	# let's treat SSL-eof as we treat normal EOF
		1627	delete $self->{_rw};
		1628	$self->{_eof} = 1;
		1629	}
1330	}	1630	}
1331		1631
1332	$self->{rbuf} .= $buf;	1632	$self->{_tls_rbuf} .= $tmp;
1333	$self->_drain_rbuf unless $self->{_in_drain};	1633	$self->_drain_rbuf;
1334	$self->{tls} or return; # tls session might have gone away in callback	1634	$self->{tls} or return; # tls session might have gone away in callback
1335	}	1635	}
1336		1636
1337	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1637	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1338
1339	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1340	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1341	return $self->_error ($!, 1);	1638	return $self->_tls_error ($tmp)
1342	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1639	if $tmp != $ERROR_WANT_READ
1343	return $self->_error (&Errno::EIO, 1);	1640	&& ($tmp != $ERROR_SYSCALL || $!);
1344	}
1345		1641
1346	# all others are fine for our purposes
1347	}
1348
1349	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1642	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1350	$self->{wbuf} .= $buf;	1643	$self->{wbuf} .= $tmp;
1351	$self->_drain_wbuf;	1644	$self->_drain_wbuf;
1352	}	1645	}
		1646
		1647	$self->{_on_starttls}
		1648	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		1649	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1353	}	1650	}
1354		1651
1355	=item $handle->starttls ($tls[, $tls_ctx])	1652	=item $handle->starttls ($tls[, $tls_ctx])
1356		1653
1357	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1654	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1358	object is created, you can also do that at a later time by calling	1655	object is created, you can also do that at a later time by calling
1359	C<starttls>.	1656	C<starttls>.
1360		1657
		1658	Starting TLS is currently an asynchronous operation - when you push some
		1659	write data and then call C<< ->starttls >> then TLS negotiation will start
		1660	immediately, after which the queued write data is then sent.
		1661
1361	The first argument is the same as the C<tls> constructor argument (either	1662	The first argument is the same as the C<tls> constructor argument (either
1362	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1663	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1363		1664
1364	The second argument is the optional C<Net::SSLeay::CTX> object that is	1665	The second argument is the optional C<AnyEvent::TLS> object that is used
1365	used when AnyEvent::Handle has to create its own TLS connection object.	1666	when AnyEvent::Handle has to create its own TLS connection object, or
		1667	a hash reference with C<< key => value >> pairs that will be used to
		1668	construct a new context.
1366		1669
1367	The TLS connection object will end up in C<< $handle->{tls} >> after this	1670	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1368	call and can be used or changed to your liking. Note that the handshake	1671	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1369	might have already started when this function returns.	1672	changed to your liking. Note that the handshake might have already started
		1673	when this function returns.
1370		1674
1371	If it an error to start a TLS handshake more than once per	1675	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1372	AnyEvent::Handle object (this is due to bugs in OpenSSL).	1676	handshakes on the same stream. Best do not attempt to use the stream after
		1677	stopping TLS.
1373		1678
1374	=cut	1679	=cut
		1680
		1681	our %TLS_CACHE; #TODO not yet documented, should we?
1375		1682
1376	sub starttls {	1683	sub starttls {
1377	my ($self, $ssl, $ctx) = @_;	1684	my ($self, $tls, $ctx) = @_;
1378		1685
1379	Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object"	1686	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
1380	if $self->{tls};	1687	if $self->{tls};
		1688
		1689	$self->{tls} = $tls;
		1690	$self->{tls_ctx} = $ctx if @_ > 2;
		1691
		1692	return unless $self->{fh};
		1693
		1694	require Net::SSLeay;
		1695
		1696	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1697	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1698
		1699	$tls = $self->{tls};
		1700	$ctx = $self->{tls_ctx};
		1701
		1702	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1703
		1704	if ("HASH" eq ref $ctx) {
		1705	require AnyEvent::TLS;
		1706
		1707	if ($ctx->{cache}) {
		1708	my $key = $ctx+0;
		1709	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1710	} else {
		1711	$ctx = new AnyEvent::TLS %$ctx;
		1712	}
		1713	}
1381		1714
1382	if ($ssl eq "accept") {	1715	$self->{tls_ctx} = $ctx || TLS_CTX ();
1383	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1716	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1384	Net::SSLeay::set_accept_state ($ssl);
1385	} elsif ($ssl eq "connect") {
1386	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
1387	Net::SSLeay::set_connect_state ($ssl);
1388	}
1389
1390	$self->{tls} = $ssl;
1391		1717
1392	# basically, this is deep magic (because SSL_read should have the same issues)	1718	# basically, this is deep magic (because SSL_read should have the same issues)
1393	# but the openssl maintainers basically said: "trust us, it just works".	1719	# but the openssl maintainers basically said: "trust us, it just works".
1394	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1720	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1395	# and mismaintained ssleay-module doesn't even offer them).	1721	# and mismaintained ssleay-module doesn't even offer them).
1396	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1722	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
1397	#	1723	#
1398	# in short: this is a mess.	1724	# in short: this is a mess.
1399	#	1725	#
1400	# note that we do not try to kepe the length constant between writes as we are required to do.	1726	# note that we do not try to keep the length constant between writes as we are required to do.
1401	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1727	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1402	# and we drive openssl fully in blocking mode here.	1728	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1729	# have identity issues in that area.
1403	Net::SSLeay::CTX_set_mode ($self->{tls},	1730	# Net::SSLeay::CTX_set_mode ($ssl,
1404	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1731	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1405	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1732	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1733	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1406		1734
1407	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1735	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1408	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1736	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1409		1737
		1738	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1739
1410	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1740	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1411		1741
1412	$self->{filter_w} = sub {	1742	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1413	$_[0]{_tls_wbuf} .= ${$_[1]};	1743	if $self->{on_starttls};
1414	&_dotls;
1415	};
1416	$self->{filter_r} = sub {
1417	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1418	&_dotls;
1419	};
1420		1744
1421	&_dotls; # need to trigger the initial negotiation exchange	1745	&_dotls; # need to trigger the initial handshake
		1746	$self->start_read; # make sure we actually do read
1422	}	1747	}
1423		1748
1424	=item $handle->stoptls	1749	=item $handle->stoptls
1425		1750
1426	Shuts down the SSL connection - this makes a proper EOF handshake by	1751	Shuts down the SSL connection - this makes a proper EOF handshake by
1427	sending a close notify to the other side, but since OpenSSL doesn't	1752	sending a close notify to the other side, but since OpenSSL doesn't
1428	support non-blocking shut downs, it is not possible to re-use the stream	1753	support non-blocking shut downs, it is not guarenteed that you can re-use
1429	afterwards.	1754	the stream afterwards.
1430		1755
1431	=cut	1756	=cut
1432		1757
1433	sub stoptls {	1758	sub stoptls {
1434	my ($self) = @_;	1759	my ($self) = @_;
1435		1760
1436	if ($self->{tls}) {	1761	if ($self->{tls}) {
1437	Net::SSLeay::shutdown $self->{tls};	1762	Net::SSLeay::shutdown ($self->{tls});
1438		1763
1439	&_dotls;	1764	&_dotls;
1440		1765
1441	# we don't give a shit. no, we do, but we can't. no...	1766	# # we don't give a shit. no, we do, but we can't. no...#d#
1442	# we, we... have to use openssl :/	1767	# # we, we... have to use openssl :/#d#
1443	&_freetls;	1768	# &_freetls;#d#
1444	}	1769	}
1445	}	1770	}
1446		1771
1447	sub _freetls {	1772	sub _freetls {
1448	my ($self) = @_;	1773	my ($self) = @_;
1449		1774
1450	return unless $self->{tls};	1775	return unless $self->{tls};
1451		1776
1452	Net::SSLeay::free (delete $self->{tls});	1777	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1778	if $self->{tls} > 0;
1453		1779
1454	delete @$self{qw(_rbio filter_w _wbio filter_r)};	1780	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1455	}	1781	}
1456		1782
1457	sub DESTROY {	1783	sub DESTROY {
1458	my $self = shift;	1784	my ($self) = @_;
1459		1785
1460	&_freetls;	1786	&_freetls;
1461		1787
1462	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1788	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1463		1789
1464	if ($linger && length $self->{wbuf}) {	1790	if ($linger && length $self->{wbuf} && $self->{fh}) {
1465	my $fh = delete $self->{fh};	1791	my $fh = delete $self->{fh};
1466	my $wbuf = delete $self->{wbuf};	1792	my $wbuf = delete $self->{wbuf};
1467		1793
1468	my @linger;	1794	my @linger;
1469		1795
…		…
1480	@linger = ();	1806	@linger = ();
1481	});	1807	});
1482	}	1808	}
1483	}	1809	}
1484		1810
		1811	=item $handle->destroy
		1812
		1813	Shuts down the handle object as much as possible - this call ensures that
		1814	no further callbacks will be invoked and as many resources as possible
		1815	will be freed. Any method you will call on the handle object after
		1816	destroying it in this way will be silently ignored (and it will return the
		1817	empty list).
		1818
		1819	Normally, you can just "forget" any references to an AnyEvent::Handle
		1820	object and it will simply shut down. This works in fatal error and EOF
		1821	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1822	callback, so when you want to destroy the AnyEvent::Handle object from
		1823	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1824	that case.
		1825
		1826	Destroying the handle object in this way has the advantage that callbacks
		1827	will be removed as well, so if those are the only reference holders (as
		1828	is common), then one doesn't need to do anything special to break any
		1829	reference cycles.
		1830
		1831	The handle might still linger in the background and write out remaining
		1832	data, as specified by the C<linger> option, however.
		1833
		1834	=cut
		1835
		1836	sub destroy {
		1837	my ($self) = @_;
		1838
		1839	$self->DESTROY;
		1840	%$self = ();
		1841	bless $self, "AnyEvent::Handle::destroyed";
		1842	}
		1843
		1844	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		1845	#nop
		1846	}
		1847
1485	=item AnyEvent::Handle::TLS_CTX	1848	=item AnyEvent::Handle::TLS_CTX
1486		1849
1487	This function creates and returns the Net::SSLeay::CTX object used by	1850	This function creates and returns the AnyEvent::TLS object used by default
1488	default for TLS mode.	1851	for TLS mode.
1489		1852
1490	The context is created like this:	1853	The context is created by calling L<AnyEvent::TLS> without any arguments.
1491
1492	Net::SSLeay::load_error_strings;
1493	Net::SSLeay::SSLeay_add_ssl_algorithms;
1494	Net::SSLeay::randomize;
1495
1496	my $CTX = Net::SSLeay::CTX_new;
1497
1498	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1499		1854
1500	=cut	1855	=cut
1501		1856
1502	our $TLS_CTX;	1857	our $TLS_CTX;
1503		1858
1504	sub TLS_CTX() {	1859	sub TLS_CTX() {
1505	$TLS_CTX || do {	1860	$TLS_CTX ||= do {
1506	require Net::SSLeay;	1861	require AnyEvent::TLS;
1507		1862
1508	Net::SSLeay::load_error_strings ();	1863	new AnyEvent::TLS
1509	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1510	Net::SSLeay::randomize ();
1511
1512	$TLS_CTX = Net::SSLeay::CTX_new ();
1513
1514	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1515
1516	$TLS_CTX
1517	}	1864	}
1518	}	1865	}
1519		1866
1520	=back	1867	=back
		1868
		1869
		1870	=head1 NONFREQUENTLY ASKED QUESTIONS
		1871
		1872	=over 4
		1873
		1874	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1875	still get further invocations!
		1876
		1877	That's because AnyEvent::Handle keeps a reference to itself when handling
		1878	read or write callbacks.
		1879
		1880	It is only safe to "forget" the reference inside EOF or error callbacks,
		1881	from within all other callbacks, you need to explicitly call the C<<
		1882	->destroy >> method.
		1883
		1884	=item I get different callback invocations in TLS mode/Why can't I pause
		1885	reading?
		1886
		1887	Unlike, say, TCP, TLS connections do not consist of two independent
		1888	communication channels, one for each direction. Or put differently. The
		1889	read and write directions are not independent of each other: you cannot
		1890	write data unless you are also prepared to read, and vice versa.
		1891
		1892	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1893	callback invocations when you are not expecting any read data - the reason
		1894	is that AnyEvent::Handle always reads in TLS mode.
		1895
		1896	During the connection, you have to make sure that you always have a
		1897	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1898	connection (or when you no longer want to use it) you can call the
		1899	C<destroy> method.
		1900
		1901	=item How do I read data until the other side closes the connection?
		1902
		1903	If you just want to read your data into a perl scalar, the easiest way
		1904	to achieve this is by setting an C<on_read> callback that does nothing,
		1905	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1906	will be in C<$_[0]{rbuf}>:
		1907
		1908	$handle->on_read (sub { });
		1909	$handle->on_eof (undef);
		1910	$handle->on_error (sub {
		1911	my $data = delete $_[0]{rbuf};
		1912	});
		1913
		1914	The reason to use C<on_error> is that TCP connections, due to latencies
		1915	and packets loss, might get closed quite violently with an error, when in
		1916	fact, all data has been received.
		1917
		1918	It is usually better to use acknowledgements when transferring data,
		1919	to make sure the other side hasn't just died and you got the data
		1920	intact. This is also one reason why so many internet protocols have an
		1921	explicit QUIT command.
		1922
		1923	=item I don't want to destroy the handle too early - how do I wait until
		1924	all data has been written?
		1925
		1926	After writing your last bits of data, set the C<on_drain> callback
		1927	and destroy the handle in there - with the default setting of
		1928	C<low_water_mark> this will be called precisely when all data has been
		1929	written to the socket:
		1930
		1931	$handle->push_write (...);
		1932	$handle->on_drain (sub {
		1933	warn "all data submitted to the kernel\n";
		1934	undef $handle;
		1935	});
		1936
		1937	If you just want to queue some data and then signal EOF to the other side,
		1938	consider using C<< ->push_shutdown >> instead.
		1939
		1940	=item I want to contact a TLS/SSL server, I don't care about security.
		1941
		1942	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1943	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1944	parameter:
		1945
		1946	tcp_connect $host, $port, sub {
		1947	my ($fh) = @_;
		1948
		1949	my $handle = new AnyEvent::Handle
		1950	fh => $fh,
		1951	tls => "connect",
		1952	on_error => sub { ... };
		1953
		1954	$handle->push_write (...);
		1955	};
		1956
		1957	=item I want to contact a TLS/SSL server, I do care about security.
		1958
		1959	Then you should additionally enable certificate verification, including
		1960	peername verification, if the protocol you use supports it (see
		1961	L<AnyEvent::TLS>, C<verify_peername>).
		1962
		1963	E.g. for HTTPS:
		1964
		1965	tcp_connect $host, $port, sub {
		1966	my ($fh) = @_;
		1967
		1968	my $handle = new AnyEvent::Handle
		1969	fh => $fh,
		1970	peername => $host,
		1971	tls => "connect",
		1972	tls_ctx => { verify => 1, verify_peername => "https" },
		1973	...
		1974
		1975	Note that you must specify the hostname you connected to (or whatever
		1976	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1977	peername verification will be done.
		1978
		1979	The above will use the system-dependent default set of trusted CA
		1980	certificates. If you want to check against a specific CA, add the
		1981	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1982
		1983	tls_ctx => {
		1984	verify => 1,
		1985	verify_peername => "https",
		1986	ca_file => "my-ca-cert.pem",
		1987	},
		1988
		1989	=item I want to create a TLS/SSL server, how do I do that?
		1990
		1991	Well, you first need to get a server certificate and key. You have
		1992	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1993	self-signed certificate (cheap. check the search engine of your choice,
		1994	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1995	nice program for that purpose).
		1996
		1997	Then create a file with your private key (in PEM format, see
		1998	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1999	file should then look like this:
		2000
		2001	-----BEGIN RSA PRIVATE KEY-----
		2002	...header data
		2003	... lots of base64'y-stuff
		2004	-----END RSA PRIVATE KEY-----
		2005
		2006	-----BEGIN CERTIFICATE-----
		2007	... lots of base64'y-stuff
		2008	-----END CERTIFICATE-----
		2009
		2010	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2011	specify this file as C<cert_file>:
		2012
		2013	tcp_server undef, $port, sub {
		2014	my ($fh) = @_;
		2015
		2016	my $handle = new AnyEvent::Handle
		2017	fh => $fh,
		2018	tls => "accept",
		2019	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2020	...
		2021
		2022	When you have intermediate CA certificates that your clients might not
		2023	know about, just append them to the C<cert_file>.
		2024
		2025	=back
		2026
1521		2027
1522	=head1 SUBCLASSING AnyEvent::Handle	2028	=head1 SUBCLASSING AnyEvent::Handle
1523		2029
1524	In many cases, you might want to subclass AnyEvent::Handle.	2030	In many cases, you might want to subclass AnyEvent::Handle.
1525		2031

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