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Revision 1.88 by root, Thu Aug 21 23:48:35 2008 UTC vs.
Revision 1.171 by root, Tue Aug 4 12:38:55 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 = 4.233;	16	our $VERSION = 4.9;
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	=head1 METHODS	64	=head1 METHODS
65		65
66	=over 4	66	=over 4
67		67
68	=item B<new (%args)>	68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
69		69
70	The constructor supports these arguments (all as key => value pairs).	70	The constructor supports these arguments (all as C<< key => value >> pairs).
71		71
72	=over 4	72	=over 4
73		73
74	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
75		75
76	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
77
78	NOTE: The filehandle will be set to non-blocking mode (using	77	NOTE: The filehandle will be set to non-blocking mode (using
79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	78	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
80	that mode.	79	that mode.
81		80
		81	=item connect => [$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
82	=item on_eof => $cb->($handle)	98	=item on_prepare => $cb->($handle)
83		99
84	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
85	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
86	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).
87		105
88	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
89	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
90	callback and continue writing data, as only the read part has been shut	108	timeout is to be used).
91	down.
92		109
93	While not mandatory, it is I<highly> recommended to set an eof callback,	110	=item on_connect => $cb->($handle, $host, $port, $retry->())
94	otherwise you might end up with a closed socket while you are still
95	waiting for data.
96		111
97	If an EOF condition has been detected but no C<on_eof> callback has been	112	This callback is called when a connection has been successfully established.
98	set, then a fatal error will be raised with C<$!> set to <0>.
99		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
100	=item on_error => $cb->($handle, $fatal)	136	=item on_error => $cb->($handle, $fatal, $message)
101		137
102	This is the error callback, which is called when, well, some error	138	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to	139	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.	140	connect or a read error.
105		141
106	Some errors are fatal (which is indicated by C<$fatal> being true). On	142	Some errors are fatal (which is indicated by C<$fatal> being true). On
107	fatal errors the handle object will be shut down and will not be usable	143	fatal errors the handle object will be destroyed (by a call to C<< ->
108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal	144	destroy >>) after invoking the error callback (which means you are free to
109	errors are an EOF condition with active (but unsatisifable) read watchers	145	examine the handle object). Examples of fatal errors are an EOF condition
110	(C<EPIPE>) or I/O errors.	146	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		147	cases where the other side can close the connection at their will it is
		148	often easiest to not report C<EPIPE> errors in this callback.
		149
		150	AnyEvent::Handle tries to find an appropriate error code for you to check
		151	against, but in some cases (TLS errors), this does not work well. It is
		152	recommended to always output the C<$message> argument in human-readable
		153	error messages (it's usually the same as C<"$!">).
111		154
112	Non-fatal errors can be retried by simply returning, but it is recommended	155	Non-fatal errors can be retried by simply returning, but it is recommended
113	to simply ignore this parameter and instead abondon the handle object	156	to simply ignore this parameter and instead abondon the handle object
114	when this callback is invoked. Examples of non-fatal errors are timeouts	157	when this callback is invoked. Examples of non-fatal errors are timeouts
115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	158	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
116		159
117	On callback entrance, the value of C<$!> contains the operating system	160	On callback entrance, the value of C<$!> contains the operating system
118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	161	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		162	C<EPROTO>).
119		163
120	While not mandatory, it is I<highly> recommended to set this callback, as	164	While not mandatory, it is I<highly> recommended to set this callback, as
121	you will not be notified of errors otherwise. The default simply calls	165	you will not be notified of errors otherwise. The default simply calls
122	C<croak>.	166	C<croak>.
123		167
…		…
127	and no read request is in the queue (unlike read queue callbacks, this	171	and no read request is in the queue (unlike read queue callbacks, this
128	callback will only be called when at least one octet of data is in the	172	callback will only be called when at least one octet of data is in the
129	read buffer).	173	read buffer).
130		174
131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	175	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
132	method or access the C<$handle->{rbuf}> member directly.	176	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		177	must not enlarge or modify the read buffer, you can only remove data at
		178	the beginning from it.
133		179
134	When an EOF condition is detected then AnyEvent::Handle will first try to	180	When an EOF condition is detected then AnyEvent::Handle will first try to
135	feed all the remaining data to the queued callbacks and C<on_read> before	181	feed all the remaining data to the queued callbacks and C<on_read> before
136	calling the C<on_eof> callback. If no progress can be made, then a fatal	182	calling the C<on_eof> callback. If no progress can be made, then a fatal
137	error will be raised (with C<$!> 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>.
138		205
139	=item on_drain => $cb->($handle)	206	=item on_drain => $cb->($handle)
140		207
141	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
142	(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).
…		…
232	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
233	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
234	system treats outstanding data at socket close time).	301	system treats outstanding data at socket close time).
235		302
236	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
237	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>.
238		316
239	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	317	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
240		318
241	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
242	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
243	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.
244		325
245	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
246	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
247	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
248	to add the dependency yourself.	329	to add the dependency yourself.
…		…
252	mode.	333	mode.
253		334
254	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
255	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>
256	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
257	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.
258		349
259	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.
260		351
261	=item tls_ctx => $ssl_ctx	352	=item tls_ctx => $anyevent_tls
262		353
263	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
264	(unless a connection object was specified directly). If this parameter is	355	(unless a connection object was specified directly). If this parameter is
265	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.
266		393
267	=item json => JSON or JSON::XS object	394	=item json => JSON or JSON::XS object
268		395
269	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.
270		397
…		…
273	texts.	400	texts.
274		401
275	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
276	use this functionality, as AnyEvent does not have a dependency itself.	403	use this functionality, as AnyEvent does not have a dependency itself.
277		404
278	=item filter_r => $cb
279
280	=item filter_w => $cb
281
282	These exist, but are undocumented at this time. (They are used internally
283	by the TLS code).
284
285	=back	405	=back
286		406
287	=cut	407	=cut
288		408
289	sub new {	409	sub new {
290	my $class = shift;	410	my $class = shift;
291
292	my $self = bless { @_ }, $class;	411	my $self = bless { @_ }, $class;
293		412
294	$self->{fh} or Carp::croak "mandatory argument fh is missing";	413	if ($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) = @_;
295		476
296	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	477	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
297
298	if ($self->{tls}) {
299	require Net::SSLeay;
300	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
301	}
302		478
303	$self->{_activity} = AnyEvent->now;	479	$self->{_activity} = AnyEvent->now;
304	$self->_timeout;	480	$self->_timeout;
305		481
306	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
307	$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};
308		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
309	$self->start_read	489	$self->start_read
310	if $self->{on_read};	490	if $self->{on_read} || @{ $self->{_queue} };
311		491
312	$self	492	$self->_drain_wbuf;
313	}	493	}
314		494
315	sub _shutdown {	495	#sub _shutdown {
316	my ($self) = @_;	496	# my ($self) = @_;
317		497	#
318	delete $self->{_tw};	498	# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
319	delete $self->{_rw};	499	# $self->{_eof} = 1; # tell starttls et. al to stop trying
320	delete $self->{_ww};	500	#
321	delete $self->{fh};	501	# &_freetls;
322		502	#}
323	$self->stoptls;
324
325	delete $self->{on_read};
326	delete $self->{_queue};
327	}
328		503
329	sub _error {	504	sub _error {
330	my ($self, $errno, $fatal) = @_;	505	my ($self, $errno, $fatal, $message) = @_;
331
332	$self->_shutdown
333	if $fatal;
334		506
335	$! = $errno;	507	$! = $errno;
		508	$message ||= "$!";
336		509
337	if ($self->{on_error}) {	510	if ($self->{on_error}) {
338	$self->{on_error}($self, $fatal);	511	$self->{on_error}($self, $fatal, $message);
339	} else {	512	$self->destroy if $fatal;
		513	} elsif ($self->{fh}) {
		514	$self->destroy;
340	Carp::croak "AnyEvent::Handle uncaught error: $!";	515	Carp::croak "AnyEvent::Handle uncaught error: $message";
341	}	516	}
342	}	517	}
343		518
344	=item $fh = $handle->fh	519	=item $fh = $handle->fh
345		520
…		…
382	}	557	}
383		558
384	=item $handle->autocork ($boolean)	559	=item $handle->autocork ($boolean)
385		560
386	Enables or disables the current autocork behaviour (see C<autocork>	561	Enables or disables the current autocork behaviour (see C<autocork>
387	constructor argument).	562	constructor argument). Changes will only take effect on the next write.
388		563
389	=cut	564	=cut
		565
		566	sub autocork {
		567	$_[0]{autocork} = $_[1];
		568	}
390		569
391	=item $handle->no_delay ($boolean)	570	=item $handle->no_delay ($boolean)
392		571
393	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
394	the same name for details).	573	the same name for details).
…		…
398	sub no_delay {	577	sub no_delay {
399	$_[0]{no_delay} = $_[1];	578	$_[0]{no_delay} = $_[1];
400		579
401	eval {	580	eval {
402	local $SIG{__DIE__};	581	local $SIG{__DIE__};
403	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};
404	};	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];
405	}	615	}
406		616
407	#############################################################################	617	#############################################################################
408		618
409	=item $handle->timeout ($seconds)	619	=item $handle->timeout ($seconds)
…		…
422	# reset the timeout watcher, as neccessary	632	# reset the timeout watcher, as neccessary
423	# also check for time-outs	633	# also check for time-outs
424	sub _timeout {	634	sub _timeout {
425	my ($self) = @_;	635	my ($self) = @_;
426		636
427	if ($self->{timeout}) {	637	if ($self->{timeout} && $self->{fh}) {
428	my $NOW = AnyEvent->now;	638	my $NOW = AnyEvent->now;
429		639
430	# when would the timeout trigger?	640	# when would the timeout trigger?
431	my $after = $self->{_activity} + $self->{timeout} - $NOW;	641	my $after = $self->{_activity} + $self->{timeout} - $NOW;
432		642
…		…
435	$self->{_activity} = $NOW;	645	$self->{_activity} = $NOW;
436		646
437	if ($self->{on_timeout}) {	647	if ($self->{on_timeout}) {
438	$self->{on_timeout}($self);	648	$self->{on_timeout}($self);
439	} else {	649	} else {
440	$self->_error (&Errno::ETIMEDOUT);	650	$self->_error (Errno::ETIMEDOUT);
441	}	651	}
442		652
443	# callback could have changed timeout value, optimise	653	# callback could have changed timeout value, optimise
444	return unless $self->{timeout};	654	return unless $self->{timeout};
445		655
…		…
487	my ($self, $cb) = @_;	697	my ($self, $cb) = @_;
488		698
489	$self->{on_drain} = $cb;	699	$self->{on_drain} = $cb;
490		700
491	$cb->($self)	701	$cb->($self)
492	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	702	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
493	}	703	}
494		704
495	=item $handle->push_write ($data)	705	=item $handle->push_write ($data)
496		706
497	Queues the given scalar to be written. You can push as much data as you	707	Queues the given scalar to be written. You can push as much data as you
…		…
508	Scalar::Util::weaken $self;	718	Scalar::Util::weaken $self;
509		719
510	my $cb = sub {	720	my $cb = sub {
511	my $len = syswrite $self->{fh}, $self->{wbuf};	721	my $len = syswrite $self->{fh}, $self->{wbuf};
512		722
513	if ($len >= 0) {	723	if (defined $len) {
514	substr $self->{wbuf}, 0, $len, "";	724	substr $self->{wbuf}, 0, $len, "";
515		725
516	$self->{_activity} = AnyEvent->now;	726	$self->{_activity} = AnyEvent->now;
517		727
518	$self->{on_drain}($self)	728	$self->{on_drain}($self)
519	if $self->{low_water_mark} >= length $self->{wbuf}	729	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
520	&& $self->{on_drain};	730	&& $self->{on_drain};
521		731
522	delete $self->{_ww} unless length $self->{wbuf};	732	delete $self->{_ww} unless length $self->{wbuf};
523	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	733	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
524	$self->_error ($!, 1);	734	$self->_error ($!, 1);
…		…
548		758
549	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	759	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
550	->($self, @_);	760	->($self, @_);
551	}	761	}
552		762
553	if ($self->{filter_w}) {	763	if ($self->{tls}) {
554	$self->{filter_w}($self, \$_[0]);	764	$self->{_tls_wbuf} .= $_[0];
		765	&_dotls ($self) if $self->{fh};
555	} else {	766	} else {
556	$self->{wbuf} .= $_[0];	767	$self->{wbuf} .= $_[0];
557	$self->_drain_wbuf;	768	$self->_drain_wbuf if $self->{fh};
558	}	769	}
559	}	770	}
560		771
561	=item $handle->push_write (type => @args)	772	=item $handle->push_write (type => @args)
562		773
…		…
576	=cut	787	=cut
577		788
578	register_write_type netstring => sub {	789	register_write_type netstring => sub {
579	my ($self, $string) = @_;	790	my ($self, $string) = @_;
580		791
581	sprintf "%d:%s,", (length $string), $string	792	(length $string) . ":$string,"
582	};	793	};
583		794
584	=item packstring => $format, $data	795	=item packstring => $format, $data
585		796
586	An octet string prefixed with an encoded length. The encoding C<$format>	797	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
651		862
652	pack "w/a*", Storable::nfreeze ($ref)	863	pack "w/a*", Storable::nfreeze ($ref)
653	};	864	};
654		865
655	=back	866	=back
		867
		868	=item $handle->push_shutdown
		869
		870	Sometimes you know you want to close the socket after writing your data
		871	before it was actually written. One way to do that is to replace your
		872	C<on_drain> handler by a callback that shuts down the socket (and set
		873	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		874	replaces the C<on_drain> callback with:
		875
		876	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		877
		878	This simply shuts down the write side and signals an EOF condition to the
		879	the peer.
		880
		881	You can rely on the normal read queue and C<on_eof> handling
		882	afterwards. This is the cleanest way to close a connection.
		883
		884	=cut
		885
		886	sub push_shutdown {
		887	my ($self) = @_;
		888
		889	delete $self->{low_water_mark};
		890	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		891	}
656		892
657	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	893	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
658		894
659	This function (not method) lets you add your own types to C<push_write>.	895	This function (not method) lets you add your own types to C<push_write>.
660	Whenever the given C<type> is used, C<push_write> will invoke the code	896	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
754	=cut	990	=cut
755		991
756	sub _drain_rbuf {	992	sub _drain_rbuf {
757	my ($self) = @_;	993	my ($self) = @_;
758		994
		995	# avoid recursion
		996	return if $self->{_skip_drain_rbuf};
759	local $self->{_in_drain} = 1;	997	local $self->{_skip_drain_rbuf} = 1;
760
761	if (
762	defined $self->{rbuf_max}
763	&& $self->{rbuf_max} < length $self->{rbuf}
764	) {
765	$self->_error (&Errno::ENOSPC, 1), return;
766	}
767		998
768	while () {	999	while () {
		1000	# we need to use a separate tls read buffer, as we must not receive data while
		1001	# we are draining the buffer, and this can only happen with TLS.
		1002	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1003	if exists $self->{_tls_rbuf};
		1004
769	my $len = length $self->{rbuf};	1005	my $len = length $self->{rbuf};
770		1006
771	if (my $cb = shift @{ $self->{_queue} }) {	1007	if (my $cb = shift @{ $self->{_queue} }) {
772	unless ($cb->($self)) {	1008	unless ($cb->($self)) {
773	if ($self->{_eof}) {	1009	# no progress can be made
774	# no progress can be made (not enough data and no data forthcoming)	1010	# (not enough data and no data forthcoming)
775	$self->_error (&Errno::EPIPE, 1), return;	1011	$self->_error (Errno::EPIPE, 1), return
776	}	1012	if $self->{_eof};
777		1013
778	unshift @{ $self->{_queue} }, $cb;	1014	unshift @{ $self->{_queue} }, $cb;
779	last;	1015	last;
780	}	1016	}
781	} elsif ($self->{on_read}) {	1017	} elsif ($self->{on_read}) {
…		…
788	&& !@{ $self->{_queue} } # and the queue is still empty	1024	&& !@{ $self->{_queue} } # and the queue is still empty
789	&& $self->{on_read} # but we still have on_read	1025	&& $self->{on_read} # but we still have on_read
790	) {	1026	) {
791	# no further data will arrive	1027	# no further data will arrive
792	# so no progress can be made	1028	# so no progress can be made
793	$self->_error (&Errno::EPIPE, 1), return	1029	$self->_error (Errno::EPIPE, 1), return
794	if $self->{_eof};	1030	if $self->{_eof};
795		1031
796	last; # more data might arrive	1032	last; # more data might arrive
797	}	1033	}
798	} else {	1034	} else {
799	# read side becomes idle	1035	# read side becomes idle
800	delete $self->{_rw};	1036	delete $self->{_rw} unless $self->{tls};
801	last;	1037	last;
802	}	1038	}
803	}	1039	}
804		1040
805	if ($self->{_eof}) {	1041	if ($self->{_eof}) {
806	if ($self->{on_eof}) {	1042	$self->{on_eof}
807	$self->{on_eof}($self)	1043	? $self->{on_eof}($self)
808	} else {	1044	: $self->_error (0, 1, "Unexpected end-of-file");
809	$self->_error (0, 1);	1045
810	}	1046	return;
		1047	}
		1048
		1049	if (
		1050	defined $self->{rbuf_max}
		1051	&& $self->{rbuf_max} < length $self->{rbuf}
		1052	) {
		1053	$self->_error (Errno::ENOSPC, 1), return;
811	}	1054	}
812		1055
813	# may need to restart read watcher	1056	# may need to restart read watcher
814	unless ($self->{_rw}) {	1057	unless ($self->{_rw}) {
815	$self->start_read	1058	$self->start_read
…		…
827		1070
828	sub on_read {	1071	sub on_read {
829	my ($self, $cb) = @_;	1072	my ($self, $cb) = @_;
830		1073
831	$self->{on_read} = $cb;	1074	$self->{on_read} = $cb;
832	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1075	$self->_drain_rbuf if $cb;
833	}	1076	}
834		1077
835	=item $handle->rbuf	1078	=item $handle->rbuf
836		1079
837	Returns the read buffer (as a modifiable lvalue).	1080	Returns the read buffer (as a modifiable lvalue).
838		1081
839	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1082	You can access the read buffer directly as the C<< ->{rbuf} >>
840	you want.	1083	member, if you want. However, the only operation allowed on the
		1084	read buffer (apart from looking at it) is removing data from its
		1085	beginning. Otherwise modifying or appending to it is not allowed and will
		1086	lead to hard-to-track-down bugs.
841		1087
842	NOTE: The read buffer should only be used or modified if the C<on_read>,	1088	NOTE: The read buffer should only be used or modified if the C<on_read>,
843	C<push_read> or C<unshift_read> methods are used. The other read methods	1089	C<push_read> or C<unshift_read> methods are used. The other read methods
844	automatically manage the read buffer.	1090	automatically manage the read buffer.
845		1091
…		…
886	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1132	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
887	->($self, $cb, @_);	1133	->($self, $cb, @_);
888	}	1134	}
889		1135
890	push @{ $self->{_queue} }, $cb;	1136	push @{ $self->{_queue} }, $cb;
891	$self->_drain_rbuf unless $self->{_in_drain};	1137	$self->_drain_rbuf;
892	}	1138	}
893		1139
894	sub unshift_read {	1140	sub unshift_read {
895	my $self = shift;	1141	my $self = shift;
896	my $cb = pop;	1142	my $cb = pop;
…		…
902	->($self, $cb, @_);	1148	->($self, $cb, @_);
903	}	1149	}
904		1150
905		1151
906	unshift @{ $self->{_queue} }, $cb;	1152	unshift @{ $self->{_queue} }, $cb;
907	$self->_drain_rbuf unless $self->{_in_drain};	1153	$self->_drain_rbuf;
908	}	1154	}
909		1155
910	=item $handle->push_read (type => @args, $cb)	1156	=item $handle->push_read (type => @args, $cb)
911		1157
912	=item $handle->unshift_read (type => @args, $cb)	1158	=item $handle->unshift_read (type => @args, $cb)
…		…
1045	return 1;	1291	return 1;
1046	}	1292	}
1047		1293
1048	# reject	1294	# reject
1049	if ($reject && $$rbuf =~ $reject) {	1295	if ($reject && $$rbuf =~ $reject) {
1050	$self->_error (&Errno::EBADMSG);	1296	$self->_error (Errno::EBADMSG);
1051	}	1297	}
1052		1298
1053	# skip	1299	# skip
1054	if ($skip && $$rbuf =~ $skip) {	1300	if ($skip && $$rbuf =~ $skip) {
1055	$data .= substr $$rbuf, 0, $+[0], "";	1301	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1071	my ($self, $cb) = @_;	1317	my ($self, $cb) = @_;
1072		1318
1073	sub {	1319	sub {
1074	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1320	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1075	if ($_[0]{rbuf} =~ /[^0-9]/) {	1321	if ($_[0]{rbuf} =~ /[^0-9]/) {
1076	$self->_error (&Errno::EBADMSG);	1322	$self->_error (Errno::EBADMSG);
1077	}	1323	}
1078	return;	1324	return;
1079	}	1325	}
1080		1326
1081	my $len = $1;	1327	my $len = $1;
…		…
1084	my $string = $_[1];	1330	my $string = $_[1];
1085	$_[0]->unshift_read (chunk => 1, sub {	1331	$_[0]->unshift_read (chunk => 1, sub {
1086	if ($_[1] eq ",") {	1332	if ($_[1] eq ",") {
1087	$cb->($_[0], $string);	1333	$cb->($_[0], $string);
1088	} else {	1334	} else {
1089	$self->_error (&Errno::EBADMSG);	1335	$self->_error (Errno::EBADMSG);
1090	}	1336	}
1091	});	1337	});
1092	});	1338	});
1093		1339
1094	1	1340	1
…		…
1100	An octet string prefixed with an encoded length. The encoding C<$format>	1346	An octet string prefixed with an encoded length. The encoding C<$format>
1101	uses the same format as a Perl C<pack> format, but must specify a single	1347	uses the same format as a Perl C<pack> format, but must specify a single
1102	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1348	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1103	optional C<!>, C<< < >> or C<< > >> modifier).	1349	optional C<!>, C<< < >> or C<< > >> modifier).
1104		1350
1105	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1351	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1352	EPP uses a prefix of C<N> (4 octtes).
1106		1353
1107	Example: read a block of data prefixed by its length in BER-encoded	1354	Example: read a block of data prefixed by its length in BER-encoded
1108	format (very efficient).	1355	format (very efficient).
1109		1356
1110	$handle->push_read (packstring => "w", sub {	1357	$handle->push_read (packstring => "w", sub {
…		…
1140	}	1387	}
1141	};	1388	};
1142		1389
1143	=item json => $cb->($handle, $hash_or_arrayref)	1390	=item json => $cb->($handle, $hash_or_arrayref)
1144		1391
1145	Reads a JSON object or array, decodes it and passes it to the callback.	1392	Reads a JSON object or array, decodes it and passes it to the
		1393	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1146		1394
1147	If a C<json> object was passed to the constructor, then that will be used	1395	If a C<json> object was passed to the constructor, then that will be used
1148	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1396	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1149		1397
1150	This read type uses the incremental parser available with JSON version	1398	This read type uses the incremental parser available with JSON version
…		…
1159	=cut	1407	=cut
1160		1408
1161	register_read_type json => sub {	1409	register_read_type json => sub {
1162	my ($self, $cb) = @_;	1410	my ($self, $cb) = @_;
1163		1411
1164	require JSON;	1412	my $json = $self->{json} ||=
		1413	eval { require JSON::XS; JSON::XS->new->utf8 }
		1414	|| do { require JSON; JSON->new->utf8 };
1165		1415
1166	my $data;	1416	my $data;
1167	my $rbuf = \$self->{rbuf};	1417	my $rbuf = \$self->{rbuf};
1168		1418
1169	my $json = $self->{json} ||= JSON->new->utf8;
1170
1171	sub {	1419	sub {
1172	my $ref = $json->incr_parse ($self->{rbuf});	1420	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1173		1421
1174	if ($ref) {	1422	if ($ref) {
1175	$self->{rbuf} = $json->incr_text;	1423	$self->{rbuf} = $json->incr_text;
1176	$json->incr_text = "";	1424	$json->incr_text = "";
1177	$cb->($self, $ref);	1425	$cb->($self, $ref);
1178		1426
1179	1	1427	1
		1428	} elsif ($@) {
		1429	# error case
		1430	$json->incr_skip;
		1431
		1432	$self->{rbuf} = $json->incr_text;
		1433	$json->incr_text = "";
		1434
		1435	$self->_error (Errno::EBADMSG);
		1436
		1437	()
1180	} else {	1438	} else {
1181	$self->{rbuf} = "";	1439	$self->{rbuf} = "";
		1440
1182	()	1441	()
1183	}	1442	}
1184	}	1443	}
1185	};	1444	};
1186		1445
…		…
1218	# read remaining chunk	1477	# read remaining chunk
1219	$_[0]->unshift_read (chunk => $len, sub {	1478	$_[0]->unshift_read (chunk => $len, sub {
1220	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1479	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1221	$cb->($_[0], $ref);	1480	$cb->($_[0], $ref);
1222	} else {	1481	} else {
1223	$self->_error (&Errno::EBADMSG);	1482	$self->_error (Errno::EBADMSG);
1224	}	1483	}
1225	});	1484	});
1226	}	1485	}
1227		1486
1228	1	1487	1
…		…
1263	Note that AnyEvent::Handle will automatically C<start_read> for you when	1522	Note that AnyEvent::Handle will automatically C<start_read> for you when
1264	you change the C<on_read> callback or push/unshift a read callback, and it	1523	you change the C<on_read> callback or push/unshift a read callback, and it
1265	will automatically C<stop_read> for you when neither C<on_read> is set nor	1524	will automatically C<stop_read> for you when neither C<on_read> is set nor
1266	there are any read requests in the queue.	1525	there are any read requests in the queue.
1267		1526
		1527	These methods will have no effect when in TLS mode (as TLS doesn't support
		1528	half-duplex connections).
		1529
1268	=cut	1530	=cut
1269		1531
1270	sub stop_read {	1532	sub stop_read {
1271	my ($self) = @_;	1533	my ($self) = @_;
1272		1534
1273	delete $self->{_rw};	1535	delete $self->{_rw} unless $self->{tls};
1274	}	1536	}
1275		1537
1276	sub start_read {	1538	sub start_read {
1277	my ($self) = @_;	1539	my ($self) = @_;
1278		1540
1279	unless ($self->{_rw} || $self->{_eof}) {	1541	unless ($self->{_rw} || $self->{_eof}) {
1280	Scalar::Util::weaken $self;	1542	Scalar::Util::weaken $self;
1281		1543
1282	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1544	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1283	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1545	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1284	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1546	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1285		1547
1286	if ($len > 0) {	1548	if ($len > 0) {
1287	$self->{_activity} = AnyEvent->now;	1549	$self->{_activity} = AnyEvent->now;
1288		1550
1289	$self->{filter_r}	1551	if ($self->{tls}) {
1290	? $self->{filter_r}($self, $rbuf)	1552	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1291	: $self->{_in_drain} || $self->_drain_rbuf;	1553
		1554	&_dotls ($self);
		1555	} else {
		1556	$self->_drain_rbuf;
		1557	}
1292		1558
1293	} elsif (defined $len) {	1559	} elsif (defined $len) {
1294	delete $self->{_rw};	1560	delete $self->{_rw};
1295	$self->{_eof} = 1;	1561	$self->{_eof} = 1;
1296	$self->_drain_rbuf unless $self->{_in_drain};	1562	$self->_drain_rbuf;
1297		1563
1298	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1564	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1299	return $self->_error ($!, 1);	1565	return $self->_error ($!, 1);
1300	}	1566	}
1301	});	1567	});
1302	}	1568	}
1303	}	1569	}
1304		1570
		1571	our $ERROR_SYSCALL;
		1572	our $ERROR_WANT_READ;
		1573
		1574	sub _tls_error {
		1575	my ($self, $err) = @_;
		1576
		1577	return $self->_error ($!, 1)
		1578	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1579
		1580	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1581
		1582	# reduce error string to look less scary
		1583	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1584
		1585	if ($self->{_on_starttls}) {
		1586	(delete $self->{_on_starttls})->($self, undef, $err);
		1587	&_freetls;
		1588	} else {
		1589	&_freetls;
		1590	$self->_error (Errno::EPROTO, 1, $err);
		1591	}
		1592	}
		1593
		1594	# poll the write BIO and send the data if applicable
		1595	# also decode read data if possible
		1596	# this is basiclaly our TLS state machine
		1597	# more efficient implementations are possible with openssl,
		1598	# but not with the buggy and incomplete Net::SSLeay.
1305	sub _dotls {	1599	sub _dotls {
1306	my ($self) = @_;	1600	my ($self) = @_;
1307		1601
1308	my $buf;	1602	my $tmp;
1309		1603
1310	if (length $self->{_tls_wbuf}) {	1604	if (length $self->{_tls_wbuf}) {
1311	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1605	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1312	substr $self->{_tls_wbuf}, 0, $len, "";	1606	substr $self->{_tls_wbuf}, 0, $tmp, "";
1313	}	1607	}
1314	}
1315		1608
		1609	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1610	return $self->_tls_error ($tmp)
		1611	if $tmp != $ERROR_WANT_READ
		1612	&& ($tmp != $ERROR_SYSCALL || $!);
		1613	}
		1614
		1615	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1616	unless (length $tmp) {
		1617	$self->{_on_starttls}
		1618	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1619	&_freetls;
		1620
		1621	if ($self->{on_stoptls}) {
		1622	$self->{on_stoptls}($self);
		1623	return;
		1624	} else {
		1625	# let's treat SSL-eof as we treat normal EOF
		1626	delete $self->{_rw};
		1627	$self->{_eof} = 1;
		1628	}
		1629	}
		1630
		1631	$self->{_tls_rbuf} .= $tmp;
		1632	$self->_drain_rbuf;
		1633	$self->{tls} or return; # tls session might have gone away in callback
		1634	}
		1635
		1636	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1637	return $self->_tls_error ($tmp)
		1638	if $tmp != $ERROR_WANT_READ
		1639	&& ($tmp != $ERROR_SYSCALL || $!);
		1640
1316	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1641	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1317	$self->{wbuf} .= $buf;	1642	$self->{wbuf} .= $tmp;
1318	$self->_drain_wbuf;	1643	$self->_drain_wbuf;
1319	}	1644	}
1320		1645
1321	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1646	$self->{_on_starttls}
1322	if (length $buf) {	1647	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1323	$self->{rbuf} .= $buf;	1648	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1324	$self->_drain_rbuf unless $self->{_in_drain};
1325	} else {
1326	# let's treat SSL-eof as we treat normal EOF
1327	$self->{_eof} = 1;
1328	$self->_shutdown;
1329	return;
1330	}
1331	}
1332
1333	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1334
1335	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1336	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1337	return $self->_error ($!, 1);
1338	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1339	return $self->_error (&Errno::EIO, 1);
1340	}
1341
1342	# all others are fine for our purposes
1343	}
1344	}	1649	}
1345		1650
1346	=item $handle->starttls ($tls[, $tls_ctx])	1651	=item $handle->starttls ($tls[, $tls_ctx])
1347		1652
1348	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1653	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1349	object is created, you can also do that at a later time by calling	1654	object is created, you can also do that at a later time by calling
1350	C<starttls>.	1655	C<starttls>.
1351		1656
		1657	Starting TLS is currently an asynchronous operation - when you push some
		1658	write data and then call C<< ->starttls >> then TLS negotiation will start
		1659	immediately, after which the queued write data is then sent.
		1660
1352	The first argument is the same as the C<tls> constructor argument (either	1661	The first argument is the same as the C<tls> constructor argument (either
1353	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1662	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1354		1663
1355	The second argument is the optional C<Net::SSLeay::CTX> object that is	1664	The second argument is the optional C<AnyEvent::TLS> object that is used
1356	used when AnyEvent::Handle has to create its own TLS connection object.	1665	when AnyEvent::Handle has to create its own TLS connection object, or
		1666	a hash reference with C<< key => value >> pairs that will be used to
		1667	construct a new context.
1357		1668
1358	The TLS connection object will end up in C<< $handle->{tls} >> after this	1669	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1359	call and can be used or changed to your liking. Note that the handshake	1670	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1360	might have already started when this function returns.	1671	changed to your liking. Note that the handshake might have already started
		1672	when this function returns.
1361		1673
		1674	Due to bugs in OpenSSL, it might or might not be possible to do multiple
		1675	handshakes on the same stream. Best do not attempt to use the stream after
		1676	stopping TLS.
		1677
1362	=cut	1678	=cut
		1679
		1680	our %TLS_CACHE; #TODO not yet documented, should we?
1363		1681
1364	sub starttls {	1682	sub starttls {
1365	my ($self, $ssl, $ctx) = @_;	1683	my ($self, $tls, $ctx) = @_;
1366		1684
1367	$self->stoptls;	1685	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1686	if $self->{tls};
1368		1687
1369	if ($ssl eq "accept") {	1688	$self->{tls} = $tls;
1370	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1689	$self->{tls_ctx} = $ctx if @_ > 2;
1371	Net::SSLeay::set_accept_state ($ssl);	1690
1372	} elsif ($ssl eq "connect") {	1691	return unless $self->{fh};
1373	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1692
1374	Net::SSLeay::set_connect_state ($ssl);	1693	require Net::SSLeay;
		1694
		1695	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1696	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1697
		1698	$tls = $self->{tls};
		1699	$ctx = $self->{tls_ctx};
		1700
		1701	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1702
		1703	if ("HASH" eq ref $ctx) {
		1704	require AnyEvent::TLS;
		1705
		1706	if ($ctx->{cache}) {
		1707	my $key = $ctx+0;
		1708	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1709	} else {
		1710	$ctx = new AnyEvent::TLS %$ctx;
		1711	}
		1712	}
1375	}	1713
1376		1714	$self->{tls_ctx} = $ctx || TLS_CTX ();
1377	$self->{tls} = $ssl;	1715	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1378		1716
1379	# basically, this is deep magic (because SSL_read should have the same issues)	1717	# basically, this is deep magic (because SSL_read should have the same issues)
1380	# but the openssl maintainers basically said: "trust us, it just works".	1718	# but the openssl maintainers basically said: "trust us, it just works".
1381	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1719	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1382	# and mismaintained ssleay-module doesn't even offer them).	1720	# and mismaintained ssleay-module doesn't even offer them).
1383	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1721	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
1384	#	1722	#
1385	# in short: this is a mess.	1723	# in short: this is a mess.
1386	#	1724	#
1387	# note that we do not try to kepe the length constant between writes as we are required to do.	1725	# note that we do not try to keep the length constant between writes as we are required to do.
1388	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1726	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1389	# and we drive openssl fully in blocking mode here.	1727	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1728	# have identity issues in that area.
1390	Net::SSLeay::CTX_set_mode ($self->{tls},	1729	# Net::SSLeay::CTX_set_mode ($ssl,
1391	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1730	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1392	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1731	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1732	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1393		1733
1394	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1734	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1395	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1735	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1396		1736
1397	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1737	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1398		1738
1399	$self->{filter_w} = sub {	1739	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1400	$_[0]{_tls_wbuf} .= ${$_[1]};	1740	if $self->{on_starttls};
1401	&_dotls;	1741
1402	};	1742	&_dotls; # need to trigger the initial handshake
1403	$self->{filter_r} = sub {	1743	$self->start_read; # make sure we actually do read
1404	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1405	&_dotls;
1406	};
1407	}	1744	}
1408		1745
1409	=item $handle->stoptls	1746	=item $handle->stoptls
1410		1747
1411	Destroys the SSL connection, if any. Partial read or write data will be	1748	Shuts down the SSL connection - this makes a proper EOF handshake by
1412	lost.	1749	sending a close notify to the other side, but since OpenSSL doesn't
		1750	support non-blocking shut downs, it is not guarenteed that you can re-use
		1751	the stream afterwards.
1413		1752
1414	=cut	1753	=cut
1415		1754
1416	sub stoptls {	1755	sub stoptls {
1417	my ($self) = @_;	1756	my ($self) = @_;
1418		1757
1419	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1758	if ($self->{tls}) {
		1759	Net::SSLeay::shutdown ($self->{tls});
1420		1760
1421	delete $self->{_rbio};	1761	&_dotls;
1422	delete $self->{_wbio};	1762
1423	delete $self->{_tls_wbuf};	1763	# # we don't give a shit. no, we do, but we can't. no...#d#
1424	delete $self->{filter_r};	1764	# # we, we... have to use openssl :/#d#
1425	delete $self->{filter_w};	1765	# &_freetls;#d#
		1766	}
		1767	}
		1768
		1769	sub _freetls {
		1770	my ($self) = @_;
		1771
		1772	return unless $self->{tls};
		1773
		1774	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1775	if $self->{tls} > 0;
		1776
		1777	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1426	}	1778	}
1427		1779
1428	sub DESTROY {	1780	sub DESTROY {
1429	my $self = shift;	1781	my ($self) = @_;
1430		1782
1431	$self->stoptls;	1783	&_freetls;
1432		1784
1433	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1785	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1434		1786
1435	if ($linger && length $self->{wbuf}) {	1787	if ($linger && length $self->{wbuf} && $self->{fh}) {
1436	my $fh = delete $self->{fh};	1788	my $fh = delete $self->{fh};
1437	my $wbuf = delete $self->{wbuf};	1789	my $wbuf = delete $self->{wbuf};
1438		1790
1439	my @linger;	1791	my @linger;
1440		1792
…		…
1451	@linger = ();	1803	@linger = ();
1452	});	1804	});
1453	}	1805	}
1454	}	1806	}
1455		1807
		1808	=item $handle->destroy
		1809
		1810	Shuts down the handle object as much as possible - this call ensures that
		1811	no further callbacks will be invoked and as many resources as possible
		1812	will be freed. Any method you will call on the handle object after
		1813	destroying it in this way will be silently ignored (and it will return the
		1814	empty list).
		1815
		1816	Normally, you can just "forget" any references to an AnyEvent::Handle
		1817	object and it will simply shut down. This works in fatal error and EOF
		1818	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1819	callback, so when you want to destroy the AnyEvent::Handle object from
		1820	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1821	that case.
		1822
		1823	Destroying the handle object in this way has the advantage that callbacks
		1824	will be removed as well, so if those are the only reference holders (as
		1825	is common), then one doesn't need to do anything special to break any
		1826	reference cycles.
		1827
		1828	The handle might still linger in the background and write out remaining
		1829	data, as specified by the C<linger> option, however.
		1830
		1831	=cut
		1832
		1833	sub destroy {
		1834	my ($self) = @_;
		1835
		1836	$self->DESTROY;
		1837	%$self = ();
		1838	bless $self, "AnyEvent::Handle::destroyed";
		1839	}
		1840
		1841	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		1842	#nop
		1843	}
		1844
1456	=item AnyEvent::Handle::TLS_CTX	1845	=item AnyEvent::Handle::TLS_CTX
1457		1846
1458	This function creates and returns the Net::SSLeay::CTX object used by	1847	This function creates and returns the AnyEvent::TLS object used by default
1459	default for TLS mode.	1848	for TLS mode.
1460		1849
1461	The context is created like this:	1850	The context is created by calling L<AnyEvent::TLS> without any arguments.
1462
1463	Net::SSLeay::load_error_strings;
1464	Net::SSLeay::SSLeay_add_ssl_algorithms;
1465	Net::SSLeay::randomize;
1466
1467	my $CTX = Net::SSLeay::CTX_new;
1468
1469	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1470		1851
1471	=cut	1852	=cut
1472		1853
1473	our $TLS_CTX;	1854	our $TLS_CTX;
1474		1855
1475	sub TLS_CTX() {	1856	sub TLS_CTX() {
1476	$TLS_CTX || do {	1857	$TLS_CTX ||= do {
1477	require Net::SSLeay;	1858	require AnyEvent::TLS;
1478		1859
1479	Net::SSLeay::load_error_strings ();	1860	new AnyEvent::TLS
1480	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1481	Net::SSLeay::randomize ();
1482
1483	$TLS_CTX = Net::SSLeay::CTX_new ();
1484
1485	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1486
1487	$TLS_CTX
1488	}	1861	}
1489	}	1862	}
1490		1863
1491	=back	1864	=back
		1865
		1866
		1867	=head1 NONFREQUENTLY ASKED QUESTIONS
		1868
		1869	=over 4
		1870
		1871	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1872	still get further invocations!
		1873
		1874	That's because AnyEvent::Handle keeps a reference to itself when handling
		1875	read or write callbacks.
		1876
		1877	It is only safe to "forget" the reference inside EOF or error callbacks,
		1878	from within all other callbacks, you need to explicitly call the C<<
		1879	->destroy >> method.
		1880
		1881	=item I get different callback invocations in TLS mode/Why can't I pause
		1882	reading?
		1883
		1884	Unlike, say, TCP, TLS connections do not consist of two independent
		1885	communication channels, one for each direction. Or put differently. The
		1886	read and write directions are not independent of each other: you cannot
		1887	write data unless you are also prepared to read, and vice versa.
		1888
		1889	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1890	callback invocations when you are not expecting any read data - the reason
		1891	is that AnyEvent::Handle always reads in TLS mode.
		1892
		1893	During the connection, you have to make sure that you always have a
		1894	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1895	connection (or when you no longer want to use it) you can call the
		1896	C<destroy> method.
		1897
		1898	=item How do I read data until the other side closes the connection?
		1899
		1900	If you just want to read your data into a perl scalar, the easiest way
		1901	to achieve this is by setting an C<on_read> callback that does nothing,
		1902	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1903	will be in C<$_[0]{rbuf}>:
		1904
		1905	$handle->on_read (sub { });
		1906	$handle->on_eof (undef);
		1907	$handle->on_error (sub {
		1908	my $data = delete $_[0]{rbuf};
		1909	});
		1910
		1911	The reason to use C<on_error> is that TCP connections, due to latencies
		1912	and packets loss, might get closed quite violently with an error, when in
		1913	fact, all data has been received.
		1914
		1915	It is usually better to use acknowledgements when transferring data,
		1916	to make sure the other side hasn't just died and you got the data
		1917	intact. This is also one reason why so many internet protocols have an
		1918	explicit QUIT command.
		1919
		1920	=item I don't want to destroy the handle too early - how do I wait until
		1921	all data has been written?
		1922
		1923	After writing your last bits of data, set the C<on_drain> callback
		1924	and destroy the handle in there - with the default setting of
		1925	C<low_water_mark> this will be called precisely when all data has been
		1926	written to the socket:
		1927
		1928	$handle->push_write (...);
		1929	$handle->on_drain (sub {
		1930	warn "all data submitted to the kernel\n";
		1931	undef $handle;
		1932	});
		1933
		1934	If you just want to queue some data and then signal EOF to the other side,
		1935	consider using C<< ->push_shutdown >> instead.
		1936
		1937	=item I want to contact a TLS/SSL server, I don't care about security.
		1938
		1939	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1940	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1941	parameter:
		1942
		1943	tcp_connect $host, $port, sub {
		1944	my ($fh) = @_;
		1945
		1946	my $handle = new AnyEvent::Handle
		1947	fh => $fh,
		1948	tls => "connect",
		1949	on_error => sub { ... };
		1950
		1951	$handle->push_write (...);
		1952	};
		1953
		1954	=item I want to contact a TLS/SSL server, I do care about security.
		1955
		1956	Then you should additionally enable certificate verification, including
		1957	peername verification, if the protocol you use supports it (see
		1958	L<AnyEvent::TLS>, C<verify_peername>).
		1959
		1960	E.g. for HTTPS:
		1961
		1962	tcp_connect $host, $port, sub {
		1963	my ($fh) = @_;
		1964
		1965	my $handle = new AnyEvent::Handle
		1966	fh => $fh,
		1967	peername => $host,
		1968	tls => "connect",
		1969	tls_ctx => { verify => 1, verify_peername => "https" },
		1970	...
		1971
		1972	Note that you must specify the hostname you connected to (or whatever
		1973	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1974	peername verification will be done.
		1975
		1976	The above will use the system-dependent default set of trusted CA
		1977	certificates. If you want to check against a specific CA, add the
		1978	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1979
		1980	tls_ctx => {
		1981	verify => 1,
		1982	verify_peername => "https",
		1983	ca_file => "my-ca-cert.pem",
		1984	},
		1985
		1986	=item I want to create a TLS/SSL server, how do I do that?
		1987
		1988	Well, you first need to get a server certificate and key. You have
		1989	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1990	self-signed certificate (cheap. check the search engine of your choice,
		1991	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1992	nice program for that purpose).
		1993
		1994	Then create a file with your private key (in PEM format, see
		1995	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1996	file should then look like this:
		1997
		1998	-----BEGIN RSA PRIVATE KEY-----
		1999	...header data
		2000	... lots of base64'y-stuff
		2001	-----END RSA PRIVATE KEY-----
		2002
		2003	-----BEGIN CERTIFICATE-----
		2004	... lots of base64'y-stuff
		2005	-----END CERTIFICATE-----
		2006
		2007	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2008	specify this file as C<cert_file>:
		2009
		2010	tcp_server undef, $port, sub {
		2011	my ($fh) = @_;
		2012
		2013	my $handle = new AnyEvent::Handle
		2014	fh => $fh,
		2015	tls => "accept",
		2016	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2017	...
		2018
		2019	When you have intermediate CA certificates that your clients might not
		2020	know about, just append them to the C<cert_file>.
		2021
		2022	=back
		2023
1492		2024
1493	=head1 SUBCLASSING AnyEvent::Handle	2025	=head1 SUBCLASSING AnyEvent::Handle
1494		2026
1495	In many cases, you might want to subclass AnyEvent::Handle.	2027	In many cases, you might want to subclass AnyEvent::Handle.
1496		2028

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