1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | no warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict qw(subs vars); |
5 | |
5 | |
6 | use AnyEvent (); |
6 | use AnyEvent (); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
8 | use Scalar::Util (); |
8 | use Scalar::Util (); |
9 | use Carp (); |
9 | use Carp (); |
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14 | |
14 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
16 | |
17 | =cut |
17 | =cut |
18 | |
18 | |
19 | our $VERSION = 4.15; |
19 | our $VERSION = 4.33; |
20 | |
20 | |
21 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
22 | |
22 | |
23 | use AnyEvent; |
23 | use AnyEvent; |
24 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
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49 | |
49 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
50 | This module is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
52 | on sockets see L<AnyEvent::Util>. |
52 | on sockets see L<AnyEvent::Util>. |
53 | |
53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
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56 | |
54 | In the following, when the documentation refers to of "bytes" then this |
57 | In the following, when the documentation refers to of "bytes" then this |
55 | means characters. As sysread and syswrite are used for all I/O, their |
58 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
57 | |
60 | |
58 | All callbacks will be invoked with the handle object as their first |
61 | All callbacks will be invoked with the handle object as their first |
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70 | |
73 | |
71 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [MANDATORY] |
72 | |
75 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
77 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
78 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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80 | that mode. |
77 | |
81 | |
78 | =item on_eof => $cb->($handle) |
82 | =item on_eof => $cb->($handle) |
79 | |
83 | |
80 | Set the callback to be called when an end-of-file condition is detcted, |
84 | Set the callback to be called when an end-of-file condition is detected, |
81 | i.e. in the case of a socket, when the other side has closed the |
85 | i.e. in the case of a socket, when the other side has closed the |
82 | connection cleanly. |
86 | connection cleanly. |
83 | |
87 | |
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88 | For sockets, this just means that the other side has stopped sending data, |
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89 | you can still try to write data, and, in fact, one can return from the EOF |
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90 | callback and continue writing data, as only the read part has been shut |
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91 | down. |
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92 | |
84 | While not mandatory, it is highly recommended to set an eof callback, |
93 | While not mandatory, it is I<highly> recommended to set an EOF callback, |
85 | otherwise you might end up with a closed socket while you are still |
94 | otherwise you might end up with a closed socket while you are still |
86 | waiting for data. |
95 | waiting for data. |
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96 | |
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97 | If an EOF condition has been detected but no C<on_eof> callback has been |
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98 | set, then a fatal error will be raised with C<$!> set to <0>. |
87 | |
99 | |
88 | =item on_error => $cb->($handle, $fatal) |
100 | =item on_error => $cb->($handle, $fatal) |
89 | |
101 | |
90 | This is the error callback, which is called when, well, some error |
102 | This is the error callback, which is called when, well, some error |
91 | occured, such as not being able to resolve the hostname, failure to |
103 | occured, such as not being able to resolve the hostname, failure to |
92 | connect or a read error. |
104 | connect or a read error. |
93 | |
105 | |
94 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
95 | fatal errors the handle object will be shut down and will not be |
107 | fatal errors the handle object will be shut down and will not be usable |
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108 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
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109 | errors are an EOF condition with active (but unsatisifable) read watchers |
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110 | (C<EPIPE>) or I/O errors. |
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111 | |
96 | usable. Non-fatal errors can be retried by simply returning, but it is |
112 | Non-fatal errors can be retried by simply returning, but it is recommended |
97 | recommended to simply ignore this parameter and instead abondon the handle |
113 | to simply ignore this parameter and instead abondon the handle object |
98 | object when this callback is invoked. |
114 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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115 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
99 | |
116 | |
100 | On callback entrance, the value of C<$!> contains the operating system |
117 | On callback entrance, the value of C<$!> contains the operating system |
101 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
102 | |
119 | |
103 | While not mandatory, it is I<highly> recommended to set this callback, as |
120 | While not mandatory, it is I<highly> recommended to set this callback, as |
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124 | This sets the callback that is called when the write buffer becomes empty |
141 | This sets the callback that is called when the write buffer becomes empty |
125 | (or when the callback is set and the buffer is empty already). |
142 | (or when the callback is set and the buffer is empty already). |
126 | |
143 | |
127 | To append to the write buffer, use the C<< ->push_write >> method. |
144 | To append to the write buffer, use the C<< ->push_write >> method. |
128 | |
145 | |
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146 | This callback is useful when you don't want to put all of your write data |
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147 | into the queue at once, for example, when you want to write the contents |
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148 | of some file to the socket you might not want to read the whole file into |
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149 | memory and push it into the queue, but instead only read more data from |
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150 | the file when the write queue becomes empty. |
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151 | |
129 | =item timeout => $fractional_seconds |
152 | =item timeout => $fractional_seconds |
130 | |
153 | |
131 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
154 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
132 | seconds pass without a successful read or write on the underlying file |
155 | seconds pass without a successful read or write on the underlying file |
133 | handle, the C<on_timeout> callback will be invoked (and if that one is |
156 | handle, the C<on_timeout> callback will be invoked (and if that one is |
134 | missing, an C<ETIMEDOUT> error will be raised). |
157 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
135 | |
158 | |
136 | Note that timeout processing is also active when you currently do not have |
159 | Note that timeout processing is also active when you currently do not have |
137 | any outstanding read or write requests: If you plan to keep the connection |
160 | any outstanding read or write requests: If you plan to keep the connection |
138 | idle then you should disable the timout temporarily or ignore the timeout |
161 | idle then you should disable the timout temporarily or ignore the timeout |
139 | in the C<on_timeout> callback. |
162 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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163 | restart the timeout. |
140 | |
164 | |
141 | Zero (the default) disables this timeout. |
165 | Zero (the default) disables this timeout. |
142 | |
166 | |
143 | =item on_timeout => $cb->($handle) |
167 | =item on_timeout => $cb->($handle) |
144 | |
168 | |
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148 | |
172 | |
149 | =item rbuf_max => <bytes> |
173 | =item rbuf_max => <bytes> |
150 | |
174 | |
151 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
175 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
152 | when the read buffer ever (strictly) exceeds this size. This is useful to |
176 | when the read buffer ever (strictly) exceeds this size. This is useful to |
153 | avoid denial-of-service attacks. |
177 | avoid some forms of denial-of-service attacks. |
154 | |
178 | |
155 | For example, a server accepting connections from untrusted sources should |
179 | For example, a server accepting connections from untrusted sources should |
156 | be configured to accept only so-and-so much data that it cannot act on |
180 | be configured to accept only so-and-so much data that it cannot act on |
157 | (for example, when expecting a line, an attacker could send an unlimited |
181 | (for example, when expecting a line, an attacker could send an unlimited |
158 | amount of data without a callback ever being called as long as the line |
182 | amount of data without a callback ever being called as long as the line |
159 | isn't finished). |
183 | isn't finished). |
160 | |
184 | |
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185 | =item autocork => <boolean> |
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186 | |
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187 | When disabled (the default), then C<push_write> will try to immediately |
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188 | write the data to the handle, if possible. This avoids having to register |
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189 | a write watcher and wait for the next event loop iteration, but can |
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190 | be inefficient if you write multiple small chunks (on the wire, this |
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191 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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192 | C<no_delay>, but this option can save costly syscalls). |
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193 | |
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194 | When enabled, then writes will always be queued till the next event loop |
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195 | iteration. This is efficient when you do many small writes per iteration, |
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196 | but less efficient when you do a single write only per iteration (or when |
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197 | the write buffer often is full). It also increases write latency. |
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198 | |
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199 | =item no_delay => <boolean> |
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200 | |
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201 | When doing small writes on sockets, your operating system kernel might |
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202 | wait a bit for more data before actually sending it out. This is called |
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203 | the Nagle algorithm, and usually it is beneficial. |
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204 | |
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205 | In some situations you want as low a delay as possible, which can be |
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206 | accomplishd by setting this option to a true value. |
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207 | |
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208 | The default is your opertaing system's default behaviour (most likely |
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209 | enabled), this option explicitly enables or disables it, if possible. |
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210 | |
161 | =item read_size => <bytes> |
211 | =item read_size => <bytes> |
162 | |
212 | |
163 | The default read block size (the amount of bytes this module will try to read |
213 | The default read block size (the amount of bytes this module will |
164 | during each (loop iteration). Default: C<8192>. |
214 | try to read during each loop iteration, which affects memory |
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215 | requirements). Default: C<8192>. |
165 | |
216 | |
166 | =item low_water_mark => <bytes> |
217 | =item low_water_mark => <bytes> |
167 | |
218 | |
168 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
219 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
169 | buffer: If the write reaches this size or gets even samller it is |
220 | buffer: If the write reaches this size or gets even samller it is |
170 | considered empty. |
221 | considered empty. |
171 | |
222 | |
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223 | Sometimes it can be beneficial (for performance reasons) to add data to |
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224 | the write buffer before it is fully drained, but this is a rare case, as |
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225 | the operating system kernel usually buffers data as well, so the default |
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226 | is good in almost all cases. |
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227 | |
172 | =item linger => <seconds> |
228 | =item linger => <seconds> |
173 | |
229 | |
174 | If non-zero (default: C<3600>), then the destructor of the |
230 | If non-zero (default: C<3600>), then the destructor of the |
175 | AnyEvent::Handle object will check wether there is still outstanding write |
231 | AnyEvent::Handle object will check whether there is still outstanding |
176 | data and will install a watcher that will write out this data. No errors |
232 | write data and will install a watcher that will write this data to the |
177 | will be reported (this mostly matches how the operating system treats |
233 | socket. No errors will be reported (this mostly matches how the operating |
178 | outstanding data at socket close time). |
234 | system treats outstanding data at socket close time). |
179 | |
235 | |
180 | This will not work for partial TLS data that could not yet been |
236 | This will not work for partial TLS data that could not be encoded |
181 | encoded. This data will be lost. |
237 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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238 | help. |
182 | |
239 | |
183 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
240 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
184 | |
241 | |
185 | When this parameter is given, it enables TLS (SSL) mode, that means it |
242 | When this parameter is given, it enables TLS (SSL) mode, that means |
186 | will start making tls handshake and will transparently encrypt/decrypt |
243 | AnyEvent will start a TLS handshake as soon as the conenction has been |
187 | data. |
244 | established and will transparently encrypt/decrypt data afterwards. |
188 | |
245 | |
189 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
246 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
190 | automatically when you try to create a TLS handle). |
247 | automatically when you try to create a TLS handle): this module doesn't |
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248 | have a dependency on that module, so if your module requires it, you have |
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249 | to add the dependency yourself. |
191 | |
250 | |
192 | For the TLS server side, use C<accept>, and for the TLS client side of a |
251 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
193 | connection, use C<connect> mode. |
252 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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253 | mode. |
194 | |
254 | |
195 | You can also provide your own TLS connection object, but you have |
255 | You can also provide your own TLS connection object, but you have |
196 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
256 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
197 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
257 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
198 | AnyEvent::Handle. |
258 | AnyEvent::Handle. |
199 | |
259 | |
200 | See the C<starttls> method if you need to start TLs negotiation later. |
260 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
201 | |
261 | |
202 | =item tls_ctx => $ssl_ctx |
262 | =item tls_ctx => $ssl_ctx |
203 | |
263 | |
204 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
264 | Use the given C<Net::SSLeay::CTX> object to create the new TLS connection |
205 | (unless a connection object was specified directly). If this parameter is |
265 | (unless a connection object was specified directly). If this parameter is |
206 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
266 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
207 | |
267 | |
208 | =item json => JSON or JSON::XS object |
268 | =item json => JSON or JSON::XS object |
209 | |
269 | |
210 | This is the json coder object used by the C<json> read and write types. |
270 | This is the json coder object used by the C<json> read and write types. |
211 | |
271 | |
212 | If you don't supply it, then AnyEvent::Handle will create and use a |
272 | If you don't supply it, then AnyEvent::Handle will create and use a |
213 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
273 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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274 | texts. |
214 | |
275 | |
215 | Note that you are responsible to depend on the JSON module if you want to |
276 | Note that you are responsible to depend on the JSON module if you want to |
216 | use this functionality, as AnyEvent does not have a dependency itself. |
277 | use this functionality, as AnyEvent does not have a dependency itself. |
217 | |
278 | |
218 | =item filter_r => $cb |
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219 | |
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220 | =item filter_w => $cb |
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221 | |
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222 | These exist, but are undocumented at this time. |
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223 | |
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224 | =back |
279 | =back |
225 | |
280 | |
226 | =cut |
281 | =cut |
227 | |
282 | |
228 | sub new { |
283 | sub new { |
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232 | |
287 | |
233 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
288 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
234 | |
289 | |
235 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
290 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
236 | |
291 | |
237 | if ($self->{tls}) { |
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238 | require Net::SSLeay; |
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239 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
292 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
240 | } |
293 | if $self->{tls}; |
241 | |
294 | |
242 | $self->{_activity} = AnyEvent->now; |
295 | $self->{_activity} = AnyEvent->now; |
243 | $self->_timeout; |
296 | $self->_timeout; |
244 | |
297 | |
245 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
298 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
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299 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
246 | |
300 | |
247 | $self->start_read |
301 | $self->start_read |
248 | if $self->{on_read}; |
302 | if $self->{on_read}; |
249 | |
303 | |
250 | $self |
304 | $self |
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256 | delete $self->{_tw}; |
310 | delete $self->{_tw}; |
257 | delete $self->{_rw}; |
311 | delete $self->{_rw}; |
258 | delete $self->{_ww}; |
312 | delete $self->{_ww}; |
259 | delete $self->{fh}; |
313 | delete $self->{fh}; |
260 | |
314 | |
261 | $self->stoptls; |
315 | &_freetls; |
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316 | |
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317 | delete $self->{on_read}; |
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318 | delete $self->{_queue}; |
262 | } |
319 | } |
263 | |
320 | |
264 | sub _error { |
321 | sub _error { |
265 | my ($self, $errno, $fatal) = @_; |
322 | my ($self, $errno, $fatal) = @_; |
266 | |
323 | |
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269 | |
326 | |
270 | $! = $errno; |
327 | $! = $errno; |
271 | |
328 | |
272 | if ($self->{on_error}) { |
329 | if ($self->{on_error}) { |
273 | $self->{on_error}($self, $fatal); |
330 | $self->{on_error}($self, $fatal); |
274 | } else { |
331 | } elsif ($self->{fh}) { |
275 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
332 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
276 | } |
333 | } |
277 | } |
334 | } |
278 | |
335 | |
279 | =item $fh = $handle->fh |
336 | =item $fh = $handle->fh |
280 | |
337 | |
281 | This method returns the file handle of the L<AnyEvent::Handle> object. |
338 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
282 | |
339 | |
283 | =cut |
340 | =cut |
284 | |
341 | |
285 | sub fh { $_[0]{fh} } |
342 | sub fh { $_[0]{fh} } |
286 | |
343 | |
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304 | $_[0]{on_eof} = $_[1]; |
361 | $_[0]{on_eof} = $_[1]; |
305 | } |
362 | } |
306 | |
363 | |
307 | =item $handle->on_timeout ($cb) |
364 | =item $handle->on_timeout ($cb) |
308 | |
365 | |
309 | Replace the current C<on_timeout> callback, or disables the callback |
366 | Replace the current C<on_timeout> callback, or disables the callback (but |
310 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
367 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
311 | argument. |
368 | argument and method. |
312 | |
369 | |
313 | =cut |
370 | =cut |
314 | |
371 | |
315 | sub on_timeout { |
372 | sub on_timeout { |
316 | $_[0]{on_timeout} = $_[1]; |
373 | $_[0]{on_timeout} = $_[1]; |
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374 | } |
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375 | |
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376 | =item $handle->autocork ($boolean) |
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377 | |
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378 | Enables or disables the current autocork behaviour (see C<autocork> |
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379 | constructor argument). Changes will only take effect on the next write. |
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380 | |
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381 | =cut |
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382 | |
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383 | sub autocork { |
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384 | $_[0]{autocork} = $_[1]; |
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385 | } |
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386 | |
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387 | =item $handle->no_delay ($boolean) |
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388 | |
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389 | Enables or disables the C<no_delay> setting (see constructor argument of |
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390 | the same name for details). |
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391 | |
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392 | =cut |
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393 | |
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394 | sub no_delay { |
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395 | $_[0]{no_delay} = $_[1]; |
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396 | |
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397 | eval { |
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398 | local $SIG{__DIE__}; |
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399 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
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400 | }; |
317 | } |
401 | } |
318 | |
402 | |
319 | ############################################################################# |
403 | ############################################################################# |
320 | |
404 | |
321 | =item $handle->timeout ($seconds) |
405 | =item $handle->timeout ($seconds) |
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399 | my ($self, $cb) = @_; |
483 | my ($self, $cb) = @_; |
400 | |
484 | |
401 | $self->{on_drain} = $cb; |
485 | $self->{on_drain} = $cb; |
402 | |
486 | |
403 | $cb->($self) |
487 | $cb->($self) |
404 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
488 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
405 | } |
489 | } |
406 | |
490 | |
407 | =item $handle->push_write ($data) |
491 | =item $handle->push_write ($data) |
408 | |
492 | |
409 | Queues the given scalar to be written. You can push as much data as you |
493 | Queues the given scalar to be written. You can push as much data as you |
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426 | substr $self->{wbuf}, 0, $len, ""; |
510 | substr $self->{wbuf}, 0, $len, ""; |
427 | |
511 | |
428 | $self->{_activity} = AnyEvent->now; |
512 | $self->{_activity} = AnyEvent->now; |
429 | |
513 | |
430 | $self->{on_drain}($self) |
514 | $self->{on_drain}($self) |
431 | if $self->{low_water_mark} >= length $self->{wbuf} |
515 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
432 | && $self->{on_drain}; |
516 | && $self->{on_drain}; |
433 | |
517 | |
434 | delete $self->{_ww} unless length $self->{wbuf}; |
518 | delete $self->{_ww} unless length $self->{wbuf}; |
435 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
519 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
436 | $self->_error ($!, 1); |
520 | $self->_error ($!, 1); |
437 | } |
521 | } |
438 | }; |
522 | }; |
439 | |
523 | |
440 | # try to write data immediately |
524 | # try to write data immediately |
441 | $cb->(); |
525 | $cb->() unless $self->{autocork}; |
442 | |
526 | |
443 | # if still data left in wbuf, we need to poll |
527 | # if still data left in wbuf, we need to poll |
444 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
528 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
445 | if length $self->{wbuf}; |
529 | if length $self->{wbuf}; |
446 | }; |
530 | }; |
… | |
… | |
460 | |
544 | |
461 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
545 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
462 | ->($self, @_); |
546 | ->($self, @_); |
463 | } |
547 | } |
464 | |
548 | |
465 | if ($self->{filter_w}) { |
549 | if ($self->{tls}) { |
466 | $self->{filter_w}($self, \$_[0]); |
550 | $self->{_tls_wbuf} .= $_[0]; |
|
|
551 | |
|
|
552 | &_dotls ($self); |
467 | } else { |
553 | } else { |
468 | $self->{wbuf} .= $_[0]; |
554 | $self->{wbuf} .= $_[0]; |
469 | $self->_drain_wbuf; |
555 | $self->_drain_wbuf; |
470 | } |
556 | } |
471 | } |
557 | } |
… | |
… | |
488 | =cut |
574 | =cut |
489 | |
575 | |
490 | register_write_type netstring => sub { |
576 | register_write_type netstring => sub { |
491 | my ($self, $string) = @_; |
577 | my ($self, $string) = @_; |
492 | |
578 | |
493 | sprintf "%d:%s,", (length $string), $string |
579 | (length $string) . ":$string," |
494 | }; |
580 | }; |
495 | |
581 | |
496 | =item packstring => $format, $data |
582 | =item packstring => $format, $data |
497 | |
583 | |
498 | An octet string prefixed with an encoded length. The encoding C<$format> |
584 | An octet string prefixed with an encoded length. The encoding C<$format> |
… | |
… | |
593 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
679 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
594 | a queue. |
680 | a queue. |
595 | |
681 | |
596 | In the simple case, you just install an C<on_read> callback and whenever |
682 | In the simple case, you just install an C<on_read> callback and whenever |
597 | new data arrives, it will be called. You can then remove some data (if |
683 | new data arrives, it will be called. You can then remove some data (if |
598 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
684 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
599 | or not. |
685 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
686 | partial message has been received so far). |
600 | |
687 | |
601 | In the more complex case, you want to queue multiple callbacks. In this |
688 | In the more complex case, you want to queue multiple callbacks. In this |
602 | case, AnyEvent::Handle will call the first queued callback each time new |
689 | case, AnyEvent::Handle will call the first queued callback each time new |
603 | data arrives (also the first time it is queued) and removes it when it has |
690 | data arrives (also the first time it is queued) and removes it when it has |
604 | done its job (see C<push_read>, below). |
691 | done its job (see C<push_read>, below). |
… | |
… | |
622 | # handle xml |
709 | # handle xml |
623 | }); |
710 | }); |
624 | }); |
711 | }); |
625 | }); |
712 | }); |
626 | |
713 | |
627 | Example 2: Implement a client for a protocol that replies either with |
714 | Example 2: Implement a client for a protocol that replies either with "OK" |
628 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
715 | and another line or "ERROR" for the first request that is sent, and 64 |
629 | second request. Due tot he availability of a full queue, we can just |
716 | bytes for the second request. Due to the availability of a queue, we can |
630 | pipeline sending both requests and manipulate the queue as necessary in |
717 | just pipeline sending both requests and manipulate the queue as necessary |
631 | the callbacks: |
718 | in the callbacks. |
632 | |
719 | |
633 | # request one |
720 | When the first callback is called and sees an "OK" response, it will |
|
|
721 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
722 | 64-byte chunk callback. |
|
|
723 | |
|
|
724 | # request one, returns either "OK + extra line" or "ERROR" |
634 | $handle->push_write ("request 1\015\012"); |
725 | $handle->push_write ("request 1\015\012"); |
635 | |
726 | |
636 | # we expect "ERROR" or "OK" as response, so push a line read |
727 | # we expect "ERROR" or "OK" as response, so push a line read |
637 | $handle->push_read (line => sub { |
728 | $handle->push_read (line => sub { |
638 | # if we got an "OK", we have to _prepend_ another line, |
729 | # if we got an "OK", we have to _prepend_ another line, |
… | |
… | |
645 | ... |
736 | ... |
646 | }); |
737 | }); |
647 | } |
738 | } |
648 | }); |
739 | }); |
649 | |
740 | |
650 | # request two |
741 | # request two, simply returns 64 octets |
651 | $handle->push_write ("request 2\015\012"); |
742 | $handle->push_write ("request 2\015\012"); |
652 | |
743 | |
653 | # simply read 64 bytes, always |
744 | # simply read 64 bytes, always |
654 | $handle->push_read (chunk => 64, sub { |
745 | $handle->push_read (chunk => 64, sub { |
655 | my $response = $_[1]; |
746 | my $response = $_[1]; |
… | |
… | |
667 | |
758 | |
668 | if ( |
759 | if ( |
669 | defined $self->{rbuf_max} |
760 | defined $self->{rbuf_max} |
670 | && $self->{rbuf_max} < length $self->{rbuf} |
761 | && $self->{rbuf_max} < length $self->{rbuf} |
671 | ) { |
762 | ) { |
672 | return $self->_error (&Errno::ENOSPC, 1); |
763 | $self->_error (&Errno::ENOSPC, 1), return; |
673 | } |
764 | } |
674 | |
765 | |
675 | while () { |
766 | while () { |
676 | no strict 'refs'; |
|
|
677 | |
|
|
678 | my $len = length $self->{rbuf}; |
767 | my $len = length $self->{rbuf}; |
679 | |
768 | |
680 | if (my $cb = shift @{ $self->{_queue} }) { |
769 | if (my $cb = shift @{ $self->{_queue} }) { |
681 | unless ($cb->($self)) { |
770 | unless ($cb->($self)) { |
682 | if ($self->{_eof}) { |
771 | if ($self->{_eof}) { |
683 | # no progress can be made (not enough data and no data forthcoming) |
772 | # no progress can be made (not enough data and no data forthcoming) |
684 | $self->_error (&Errno::EPIPE, 1), last; |
773 | $self->_error (&Errno::EPIPE, 1), return; |
685 | } |
774 | } |
686 | |
775 | |
687 | unshift @{ $self->{_queue} }, $cb; |
776 | unshift @{ $self->{_queue} }, $cb; |
688 | last; |
777 | last; |
689 | } |
778 | } |
… | |
… | |
697 | && !@{ $self->{_queue} } # and the queue is still empty |
786 | && !@{ $self->{_queue} } # and the queue is still empty |
698 | && $self->{on_read} # but we still have on_read |
787 | && $self->{on_read} # but we still have on_read |
699 | ) { |
788 | ) { |
700 | # no further data will arrive |
789 | # no further data will arrive |
701 | # so no progress can be made |
790 | # so no progress can be made |
702 | $self->_error (&Errno::EPIPE, 1), last |
791 | $self->_error (&Errno::EPIPE, 1), return |
703 | if $self->{_eof}; |
792 | if $self->{_eof}; |
704 | |
793 | |
705 | last; # more data might arrive |
794 | last; # more data might arrive |
706 | } |
795 | } |
707 | } else { |
796 | } else { |
708 | # read side becomes idle |
797 | # read side becomes idle |
709 | delete $self->{_rw}; |
798 | delete $self->{_rw} unless $self->{tls}; |
710 | last; |
799 | last; |
711 | } |
800 | } |
712 | } |
801 | } |
713 | |
802 | |
|
|
803 | if ($self->{_eof}) { |
|
|
804 | if ($self->{on_eof}) { |
714 | $self->{on_eof}($self) |
805 | $self->{on_eof}($self) |
715 | if $self->{_eof} && $self->{on_eof}; |
806 | } else { |
|
|
807 | $self->_error (0, 1); |
|
|
808 | } |
|
|
809 | } |
716 | |
810 | |
717 | # may need to restart read watcher |
811 | # may need to restart read watcher |
718 | unless ($self->{_rw}) { |
812 | unless ($self->{_rw}) { |
719 | $self->start_read |
813 | $self->start_read |
720 | if $self->{on_read} || @{ $self->{_queue} }; |
814 | if $self->{on_read} || @{ $self->{_queue} }; |
… | |
… | |
846 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
940 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
847 | 1 |
941 | 1 |
848 | } |
942 | } |
849 | }; |
943 | }; |
850 | |
944 | |
851 | # compatibility with older API |
|
|
852 | sub push_read_chunk { |
|
|
853 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
854 | } |
|
|
855 | |
|
|
856 | sub unshift_read_chunk { |
|
|
857 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
858 | } |
|
|
859 | |
|
|
860 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
945 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
861 | |
946 | |
862 | The callback will be called only once a full line (including the end of |
947 | The callback will be called only once a full line (including the end of |
863 | line marker, C<$eol>) has been read. This line (excluding the end of line |
948 | line marker, C<$eol>) has been read. This line (excluding the end of line |
864 | marker) will be passed to the callback as second argument (C<$line>), and |
949 | marker) will be passed to the callback as second argument (C<$line>), and |
… | |
… | |
879 | =cut |
964 | =cut |
880 | |
965 | |
881 | register_read_type line => sub { |
966 | register_read_type line => sub { |
882 | my ($self, $cb, $eol) = @_; |
967 | my ($self, $cb, $eol) = @_; |
883 | |
968 | |
884 | $eol = qr|(\015?\012)| if @_ < 3; |
969 | if (@_ < 3) { |
|
|
970 | # this is more than twice as fast as the generic code below |
|
|
971 | sub { |
|
|
972 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
973 | |
|
|
974 | $cb->($_[0], $1, $2); |
|
|
975 | 1 |
|
|
976 | } |
|
|
977 | } else { |
885 | $eol = quotemeta $eol unless ref $eol; |
978 | $eol = quotemeta $eol unless ref $eol; |
886 | $eol = qr|^(.*?)($eol)|s; |
979 | $eol = qr|^(.*?)($eol)|s; |
887 | |
980 | |
888 | sub { |
981 | sub { |
889 | $_[0]{rbuf} =~ s/$eol// or return; |
982 | $_[0]{rbuf} =~ s/$eol// or return; |
890 | |
983 | |
891 | $cb->($_[0], $1, $2); |
984 | $cb->($_[0], $1, $2); |
|
|
985 | 1 |
892 | 1 |
986 | } |
893 | } |
987 | } |
894 | }; |
988 | }; |
895 | |
|
|
896 | # compatibility with older API |
|
|
897 | sub push_read_line { |
|
|
898 | my $self = shift; |
|
|
899 | $self->push_read (line => @_); |
|
|
900 | } |
|
|
901 | |
|
|
902 | sub unshift_read_line { |
|
|
903 | my $self = shift; |
|
|
904 | $self->unshift_read (line => @_); |
|
|
905 | } |
|
|
906 | |
989 | |
907 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
990 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
908 | |
991 | |
909 | Makes a regex match against the regex object C<$accept> and returns |
992 | Makes a regex match against the regex object C<$accept> and returns |
910 | everything up to and including the match. |
993 | everything up to and including the match. |
… | |
… | |
1015 | An octet string prefixed with an encoded length. The encoding C<$format> |
1098 | An octet string prefixed with an encoded length. The encoding C<$format> |
1016 | uses the same format as a Perl C<pack> format, but must specify a single |
1099 | uses the same format as a Perl C<pack> format, but must specify a single |
1017 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
1100 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
1018 | optional C<!>, C<< < >> or C<< > >> modifier). |
1101 | optional C<!>, C<< < >> or C<< > >> modifier). |
1019 | |
1102 | |
1020 | DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>. |
1103 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1104 | EPP uses a prefix of C<N> (4 octtes). |
1021 | |
1105 | |
1022 | Example: read a block of data prefixed by its length in BER-encoded |
1106 | Example: read a block of data prefixed by its length in BER-encoded |
1023 | format (very efficient). |
1107 | format (very efficient). |
1024 | |
1108 | |
1025 | $handle->push_read (packstring => "w", sub { |
1109 | $handle->push_read (packstring => "w", sub { |
… | |
… | |
1031 | register_read_type packstring => sub { |
1115 | register_read_type packstring => sub { |
1032 | my ($self, $cb, $format) = @_; |
1116 | my ($self, $cb, $format) = @_; |
1033 | |
1117 | |
1034 | sub { |
1118 | sub { |
1035 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1119 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1036 | defined (my $len = eval { unpack $format, $_[0]->{rbuf} }) |
1120 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
1037 | or return; |
1121 | or return; |
1038 | |
1122 | |
|
|
1123 | $format = length pack $format, $len; |
|
|
1124 | |
|
|
1125 | # bypass unshift if we already have the remaining chunk |
|
|
1126 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1127 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1128 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1129 | $cb->($_[0], $data); |
|
|
1130 | } else { |
1039 | # remove prefix |
1131 | # remove prefix |
1040 | substr $_[0]->{rbuf}, 0, (length pack $format, $len), ""; |
1132 | substr $_[0]{rbuf}, 0, $format, ""; |
1041 | |
1133 | |
1042 | # read rest |
1134 | # read remaining chunk |
1043 | $_[0]->unshift_read (chunk => $len, $cb); |
1135 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1136 | } |
1044 | |
1137 | |
1045 | 1 |
1138 | 1 |
1046 | } |
1139 | } |
1047 | }; |
1140 | }; |
1048 | |
1141 | |
… | |
… | |
1105 | |
1198 | |
1106 | require Storable; |
1199 | require Storable; |
1107 | |
1200 | |
1108 | sub { |
1201 | sub { |
1109 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1202 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1110 | defined (my $len = eval { unpack "w", $_[0]->{rbuf} }) |
1203 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
1111 | or return; |
1204 | or return; |
1112 | |
1205 | |
|
|
1206 | my $format = length pack "w", $len; |
|
|
1207 | |
|
|
1208 | # bypass unshift if we already have the remaining chunk |
|
|
1209 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1210 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1211 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1212 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1213 | } else { |
1113 | # remove prefix |
1214 | # remove prefix |
1114 | substr $_[0]->{rbuf}, 0, (length pack "w", $len), ""; |
1215 | substr $_[0]{rbuf}, 0, $format, ""; |
1115 | |
1216 | |
1116 | # read rest |
1217 | # read remaining chunk |
1117 | $_[0]->unshift_read (chunk => $len, sub { |
1218 | $_[0]->unshift_read (chunk => $len, sub { |
1118 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1219 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1119 | $cb->($_[0], $ref); |
1220 | $cb->($_[0], $ref); |
1120 | } else { |
1221 | } else { |
1121 | $self->_error (&Errno::EBADMSG); |
1222 | $self->_error (&Errno::EBADMSG); |
|
|
1223 | } |
1122 | } |
1224 | }); |
1123 | }); |
1225 | } |
|
|
1226 | |
|
|
1227 | 1 |
1124 | } |
1228 | } |
1125 | }; |
1229 | }; |
1126 | |
1230 | |
1127 | =back |
1231 | =back |
1128 | |
1232 | |
… | |
… | |
1158 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
1262 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
1159 | you change the C<on_read> callback or push/unshift a read callback, and it |
1263 | you change the C<on_read> callback or push/unshift a read callback, and it |
1160 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
1264 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
1161 | there are any read requests in the queue. |
1265 | there are any read requests in the queue. |
1162 | |
1266 | |
|
|
1267 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1268 | half-duplex connections). |
|
|
1269 | |
1163 | =cut |
1270 | =cut |
1164 | |
1271 | |
1165 | sub stop_read { |
1272 | sub stop_read { |
1166 | my ($self) = @_; |
1273 | my ($self) = @_; |
1167 | |
1274 | |
1168 | delete $self->{_rw}; |
1275 | delete $self->{_rw} unless $self->{tls}; |
1169 | } |
1276 | } |
1170 | |
1277 | |
1171 | sub start_read { |
1278 | sub start_read { |
1172 | my ($self) = @_; |
1279 | my ($self) = @_; |
1173 | |
1280 | |
1174 | unless ($self->{_rw} || $self->{_eof}) { |
1281 | unless ($self->{_rw} || $self->{_eof}) { |
1175 | Scalar::Util::weaken $self; |
1282 | Scalar::Util::weaken $self; |
1176 | |
1283 | |
1177 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1284 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1178 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1285 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
1179 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1286 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1180 | |
1287 | |
1181 | if ($len > 0) { |
1288 | if ($len > 0) { |
1182 | $self->{_activity} = AnyEvent->now; |
1289 | $self->{_activity} = AnyEvent->now; |
1183 | |
1290 | |
1184 | $self->{filter_r} |
1291 | if ($self->{tls}) { |
1185 | ? $self->{filter_r}($self, $rbuf) |
1292 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
1186 | : $self->{_in_drain} || $self->_drain_rbuf; |
1293 | |
|
|
1294 | &_dotls ($self); |
|
|
1295 | } else { |
|
|
1296 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1297 | } |
1187 | |
1298 | |
1188 | } elsif (defined $len) { |
1299 | } elsif (defined $len) { |
1189 | delete $self->{_rw}; |
1300 | delete $self->{_rw}; |
1190 | $self->{_eof} = 1; |
1301 | $self->{_eof} = 1; |
1191 | $self->_drain_rbuf unless $self->{_in_drain}; |
1302 | $self->_drain_rbuf unless $self->{_in_drain}; |
… | |
… | |
1195 | } |
1306 | } |
1196 | }); |
1307 | }); |
1197 | } |
1308 | } |
1198 | } |
1309 | } |
1199 | |
1310 | |
|
|
1311 | # poll the write BIO and send the data if applicable |
1200 | sub _dotls { |
1312 | sub _dotls { |
1201 | my ($self) = @_; |
1313 | my ($self) = @_; |
1202 | |
1314 | |
1203 | my $buf; |
1315 | my $tmp; |
1204 | |
1316 | |
1205 | if (length $self->{_tls_wbuf}) { |
1317 | if (length $self->{_tls_wbuf}) { |
1206 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1318 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1207 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1319 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
1208 | } |
1320 | } |
1209 | } |
1321 | } |
1210 | |
1322 | |
1211 | if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1212 | $self->{wbuf} .= $buf; |
|
|
1213 | $self->_drain_wbuf; |
|
|
1214 | } |
|
|
1215 | |
|
|
1216 | while (defined ($buf = Net::SSLeay::read ($self->{tls}))) { |
1323 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
1217 | if (length $buf) { |
1324 | unless (length $tmp) { |
1218 | $self->{rbuf} .= $buf; |
|
|
1219 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1220 | } else { |
|
|
1221 | # let's treat SSL-eof as we treat normal EOF |
1325 | # let's treat SSL-eof as we treat normal EOF |
|
|
1326 | delete $self->{_rw}; |
1222 | $self->{_eof} = 1; |
1327 | $self->{_eof} = 1; |
1223 | $self->_shutdown; |
1328 | &_freetls; |
1224 | return; |
|
|
1225 | } |
1329 | } |
1226 | } |
|
|
1227 | |
1330 | |
|
|
1331 | $self->{rbuf} .= $tmp; |
|
|
1332 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1333 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1334 | } |
|
|
1335 | |
1228 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
1336 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
1229 | |
1337 | |
1230 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
1338 | if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) { |
1231 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
1339 | if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) { |
1232 | return $self->_error ($!, 1); |
1340 | return $self->_error ($!, 1); |
1233 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
1341 | } elsif ($tmp == Net::SSLeay::ERROR_SSL ()) { |
1234 | return $self->_error (&Errno::EIO, 1); |
1342 | return $self->_error (&Errno::EIO, 1); |
1235 | } |
1343 | } |
1236 | |
1344 | |
1237 | # all others are fine for our purposes |
1345 | # all other errors are fine for our purposes |
|
|
1346 | } |
|
|
1347 | |
|
|
1348 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1349 | $self->{wbuf} .= $tmp; |
|
|
1350 | $self->_drain_wbuf; |
1238 | } |
1351 | } |
1239 | } |
1352 | } |
1240 | |
1353 | |
1241 | =item $handle->starttls ($tls[, $tls_ctx]) |
1354 | =item $handle->starttls ($tls[, $tls_ctx]) |
1242 | |
1355 | |
… | |
… | |
1252 | |
1365 | |
1253 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1366 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1254 | call and can be used or changed to your liking. Note that the handshake |
1367 | call and can be used or changed to your liking. Note that the handshake |
1255 | might have already started when this function returns. |
1368 | might have already started when this function returns. |
1256 | |
1369 | |
|
|
1370 | If it an error to start a TLS handshake more than once per |
|
|
1371 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1372 | |
1257 | =cut |
1373 | =cut |
1258 | |
1374 | |
1259 | sub starttls { |
1375 | sub starttls { |
1260 | my ($self, $ssl, $ctx) = @_; |
1376 | my ($self, $ssl, $ctx) = @_; |
1261 | |
1377 | |
1262 | $self->stoptls; |
1378 | require Net::SSLeay; |
1263 | |
1379 | |
|
|
1380 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
|
|
1381 | if $self->{tls}; |
|
|
1382 | |
1264 | if ($ssl eq "accept") { |
1383 | if ($ssl eq "accept") { |
1265 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1384 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1266 | Net::SSLeay::set_accept_state ($ssl); |
1385 | Net::SSLeay::set_accept_state ($ssl); |
1267 | } elsif ($ssl eq "connect") { |
1386 | } elsif ($ssl eq "connect") { |
1268 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1387 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
… | |
… | |
1274 | # basically, this is deep magic (because SSL_read should have the same issues) |
1393 | # basically, this is deep magic (because SSL_read should have the same issues) |
1275 | # but the openssl maintainers basically said: "trust us, it just works". |
1394 | # but the openssl maintainers basically said: "trust us, it just works". |
1276 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1395 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1277 | # and mismaintained ssleay-module doesn't even offer them). |
1396 | # and mismaintained ssleay-module doesn't even offer them). |
1278 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1397 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1398 | # |
|
|
1399 | # in short: this is a mess. |
|
|
1400 | # |
|
|
1401 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1402 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1403 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1404 | # have identity issues in that area. |
1279 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1405 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1280 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1406 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1281 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1407 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1282 | |
1408 | |
1283 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1409 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1284 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1410 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1285 | |
1411 | |
1286 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1412 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1287 | |
1413 | |
1288 | $self->{filter_w} = sub { |
1414 | &_dotls; # need to trigger the initial handshake |
1289 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
1415 | $self->start_read; # make sure we actually do read |
1290 | &_dotls; |
|
|
1291 | }; |
|
|
1292 | $self->{filter_r} = sub { |
|
|
1293 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
|
|
1294 | &_dotls; |
|
|
1295 | }; |
|
|
1296 | } |
1416 | } |
1297 | |
1417 | |
1298 | =item $handle->stoptls |
1418 | =item $handle->stoptls |
1299 | |
1419 | |
1300 | Destroys the SSL connection, if any. Partial read or write data will be |
1420 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1301 | lost. |
1421 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1422 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1423 | afterwards. |
1302 | |
1424 | |
1303 | =cut |
1425 | =cut |
1304 | |
1426 | |
1305 | sub stoptls { |
1427 | sub stoptls { |
1306 | my ($self) = @_; |
1428 | my ($self) = @_; |
1307 | |
1429 | |
|
|
1430 | if ($self->{tls}) { |
|
|
1431 | Net::SSLeay::shutdown ($self->{tls}); |
|
|
1432 | |
|
|
1433 | &_dotls; |
|
|
1434 | |
|
|
1435 | # we don't give a shit. no, we do, but we can't. no... |
|
|
1436 | # we, we... have to use openssl :/ |
|
|
1437 | &_freetls; |
|
|
1438 | } |
|
|
1439 | } |
|
|
1440 | |
|
|
1441 | sub _freetls { |
|
|
1442 | my ($self) = @_; |
|
|
1443 | |
|
|
1444 | return unless $self->{tls}; |
|
|
1445 | |
1308 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1446 | Net::SSLeay::free (delete $self->{tls}); |
1309 | |
1447 | |
1310 | delete $self->{_rbio}; |
1448 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
1311 | delete $self->{_wbio}; |
|
|
1312 | delete $self->{_tls_wbuf}; |
|
|
1313 | delete $self->{filter_r}; |
|
|
1314 | delete $self->{filter_w}; |
|
|
1315 | } |
1449 | } |
1316 | |
1450 | |
1317 | sub DESTROY { |
1451 | sub DESTROY { |
1318 | my $self = shift; |
1452 | my $self = shift; |
1319 | |
1453 | |
1320 | $self->stoptls; |
1454 | &_freetls; |
1321 | |
1455 | |
1322 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1456 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1323 | |
1457 | |
1324 | if ($linger && length $self->{wbuf}) { |
1458 | if ($linger && length $self->{wbuf}) { |
1325 | my $fh = delete $self->{fh}; |
1459 | my $fh = delete $self->{fh}; |
… | |
… | |
1340 | @linger = (); |
1474 | @linger = (); |
1341 | }); |
1475 | }); |
1342 | } |
1476 | } |
1343 | } |
1477 | } |
1344 | |
1478 | |
|
|
1479 | =item $handle->destroy |
|
|
1480 | |
|
|
1481 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1482 | no further callbacks will be invoked and resources will be freed as much |
|
|
1483 | as possible. You must not call any methods on the object afterwards. |
|
|
1484 | |
|
|
1485 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1486 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1487 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1488 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1489 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1490 | that case. |
|
|
1491 | |
|
|
1492 | The handle might still linger in the background and write out remaining |
|
|
1493 | data, as specified by the C<linger> option, however. |
|
|
1494 | |
|
|
1495 | =cut |
|
|
1496 | |
|
|
1497 | sub destroy { |
|
|
1498 | my ($self) = @_; |
|
|
1499 | |
|
|
1500 | $self->DESTROY; |
|
|
1501 | %$self = (); |
|
|
1502 | } |
|
|
1503 | |
1345 | =item AnyEvent::Handle::TLS_CTX |
1504 | =item AnyEvent::Handle::TLS_CTX |
1346 | |
1505 | |
1347 | This function creates and returns the Net::SSLeay::CTX object used by |
1506 | This function creates and returns the Net::SSLeay::CTX object used by |
1348 | default for TLS mode. |
1507 | default for TLS mode. |
1349 | |
1508 | |
… | |
… | |
1377 | } |
1536 | } |
1378 | } |
1537 | } |
1379 | |
1538 | |
1380 | =back |
1539 | =back |
1381 | |
1540 | |
|
|
1541 | |
|
|
1542 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1543 | |
|
|
1544 | =over 4 |
|
|
1545 | |
|
|
1546 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1547 | still get further invocations! |
|
|
1548 | |
|
|
1549 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1550 | read or write callbacks. |
|
|
1551 | |
|
|
1552 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1553 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1554 | ->destroy >> method. |
|
|
1555 | |
|
|
1556 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1557 | reading? |
|
|
1558 | |
|
|
1559 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1560 | communication channels, one for each direction. Or put differently. The |
|
|
1561 | read and write directions are not independent of each other: you cannot |
|
|
1562 | write data unless you are also prepared to read, and vice versa. |
|
|
1563 | |
|
|
1564 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1565 | callback invocations when you are not expecting any read data - the reason |
|
|
1566 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1567 | |
|
|
1568 | During the connection, you have to make sure that you always have a |
|
|
1569 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1570 | connection (or when you no longer want to use it) you can call the |
|
|
1571 | C<destroy> method. |
|
|
1572 | |
|
|
1573 | =item How do I read data until the other side closes the connection? |
|
|
1574 | |
|
|
1575 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1576 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1577 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1578 | will be in C<$_[0]{rbuf}>: |
|
|
1579 | |
|
|
1580 | $handle->on_read (sub { }); |
|
|
1581 | $handle->on_eof (undef); |
|
|
1582 | $handle->on_error (sub { |
|
|
1583 | my $data = delete $_[0]{rbuf}; |
|
|
1584 | undef $handle; |
|
|
1585 | }); |
|
|
1586 | |
|
|
1587 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1588 | and packets loss, might get closed quite violently with an error, when in |
|
|
1589 | fact, all data has been received. |
|
|
1590 | |
|
|
1591 | It is usually better to use acknowledgements when transferring data, |
|
|
1592 | to make sure the other side hasn't just died and you got the data |
|
|
1593 | intact. This is also one reason why so many internet protocols have an |
|
|
1594 | explicit QUIT command. |
|
|
1595 | |
|
|
1596 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1597 | all data has been written? |
|
|
1598 | |
|
|
1599 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1600 | and destroy the handle in there - with the default setting of |
|
|
1601 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1602 | written to the socket: |
|
|
1603 | |
|
|
1604 | $handle->push_write (...); |
|
|
1605 | $handle->on_drain (sub { |
|
|
1606 | warn "all data submitted to the kernel\n"; |
|
|
1607 | undef $handle; |
|
|
1608 | }); |
|
|
1609 | |
|
|
1610 | =back |
|
|
1611 | |
|
|
1612 | |
1382 | =head1 SUBCLASSING AnyEvent::Handle |
1613 | =head1 SUBCLASSING AnyEvent::Handle |
1383 | |
1614 | |
1384 | In many cases, you might want to subclass AnyEvent::Handle. |
1615 | In many cases, you might want to subclass AnyEvent::Handle. |
1385 | |
1616 | |
1386 | To make this easier, a given version of AnyEvent::Handle uses these |
1617 | To make this easier, a given version of AnyEvent::Handle uses these |
… | |
… | |
1389 | =over 4 |
1620 | =over 4 |
1390 | |
1621 | |
1391 | =item * all constructor arguments become object members. |
1622 | =item * all constructor arguments become object members. |
1392 | |
1623 | |
1393 | At least initially, when you pass a C<tls>-argument to the constructor it |
1624 | At least initially, when you pass a C<tls>-argument to the constructor it |
1394 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
1625 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
1395 | mutated later on (for example C<tls> will hold the TLS connection object). |
1626 | mutated later on (for example C<tls> will hold the TLS connection object). |
1396 | |
1627 | |
1397 | =item * other object member names are prefixed with an C<_>. |
1628 | =item * other object member names are prefixed with an C<_>. |
1398 | |
1629 | |
1399 | All object members not explicitly documented (internal use) are prefixed |
1630 | All object members not explicitly documented (internal use) are prefixed |