… | |
… | |
2 | |
2 | |
3 | AnyEvent::Socket - useful IPv4 and IPv6 stuff. |
3 | AnyEvent::Socket - useful IPv4 and IPv6 stuff. |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use AnyEvent::Socket; |
7 | use AnyEvent::Socket; |
8 | |
8 | |
9 | tcp_connect "gameserver.deliantra.net", 13327, sub { |
9 | tcp_connect "gameserver.deliantra.net", 13327, sub { |
10 | my ($fh) = @_ |
10 | my ($fh) = @_ |
11 | or die "gameserver.deliantra.net connect failed: $!"; |
11 | or die "gameserver.deliantra.net connect failed: $!"; |
12 | |
12 | |
13 | # enjoy your filehandle |
13 | # enjoy your filehandle |
14 | }; |
14 | }; |
15 | |
15 | |
16 | # a simple tcp server |
16 | # a simple tcp server |
17 | tcp_server undef, 8888, sub { |
17 | tcp_server undef, 8888, sub { |
18 | my ($fh, $host, $port) = @_; |
18 | my ($fh, $host, $port) = @_; |
19 | |
19 | |
20 | syswrite $fh, "The internet is full, $host:$port. Go away!\015\012"; |
20 | syswrite $fh, "The internet is full, $host:$port. Go away!\015\012"; |
21 | }; |
21 | }; |
22 | |
22 | |
23 | =head1 DESCRIPTION |
23 | =head1 DESCRIPTION |
24 | |
24 | |
25 | This module implements various utility functions for handling internet |
25 | This module implements various utility functions for handling internet |
26 | protocol addresses and sockets, in an as transparent and simple way as |
26 | protocol addresses and sockets, in an as transparent and simple way as |
… | |
… | |
38 | no warnings; |
38 | no warnings; |
39 | use strict; |
39 | use strict; |
40 | |
40 | |
41 | use Carp (); |
41 | use Carp (); |
42 | use Errno (); |
42 | use Errno (); |
43 | use Socket (); |
43 | use Socket qw(AF_INET AF_UNIX SOCK_STREAM SOCK_DGRAM SOL_SOCKET SO_REUSEADDR); |
44 | |
44 | |
45 | use AnyEvent (); |
45 | use AnyEvent (); |
46 | use AnyEvent::Util qw(guard fh_nonblocking); |
46 | use AnyEvent::Util qw(guard fh_nonblocking AF_INET6); |
47 | use AnyEvent::DNS (); |
47 | use AnyEvent::DNS (); |
48 | |
48 | |
49 | use base 'Exporter'; |
49 | use base 'Exporter'; |
50 | |
50 | |
51 | BEGIN { |
51 | our @EXPORT = qw( |
52 | *socket_inet_aton = \&Socket::inet_aton; # take a copy, in case Coro::LWP overrides it |
52 | parse_hostport |
53 | } |
53 | parse_ipv4 parse_ipv6 |
|
|
54 | parse_ip parse_address |
|
|
55 | format_ip format_address |
|
|
56 | address_family |
|
|
57 | inet_aton |
|
|
58 | tcp_server |
|
|
59 | tcp_connect |
|
|
60 | ); |
54 | |
61 | |
55 | BEGIN { |
|
|
56 | my $af_inet6 = eval { &Socket::AF_INET6 }; |
|
|
57 | eval "sub AF_INET6() { $af_inet6 }"; die if $@; |
|
|
58 | |
|
|
59 | delete $AnyEvent::PROTOCOL{ipv6} unless $af_inet6; |
|
|
60 | } |
|
|
61 | |
|
|
62 | our @EXPORT = qw(parse_ipv4 parse_ipv6 parse_ip format_ip inet_aton tcp_server tcp_connect); |
|
|
63 | |
|
|
64 | our $VERSION = '1.0'; |
62 | our $VERSION = 4.4; |
65 | |
63 | |
66 | =item $ipn = parse_ipv4 $dotted_quad |
64 | =item $ipn = parse_ipv4 $dotted_quad |
67 | |
65 | |
68 | Tries to parse the given dotted quad IPv4 address and return it in |
66 | Tries to parse the given dotted quad IPv4 address and return it in |
69 | octet form (or undef when it isn't in a parsable format). Supports all |
67 | octet form (or undef when it isn't in a parsable format). Supports all |
… | |
… | |
81 | |
79 | |
82 | # check leading parts against range |
80 | # check leading parts against range |
83 | return undef if grep $_ >= 256, @_[0 .. @_ - 2]; |
81 | return undef if grep $_ >= 256, @_[0 .. @_ - 2]; |
84 | |
82 | |
85 | # check trailing part against range |
83 | # check trailing part against range |
86 | return undef if $_[-1] >= 1 << (8 * (4 - $#_)); |
84 | return undef if $_[-1] >= 2 ** (8 * (4 - $#_)); |
87 | |
85 | |
88 | pack "N", (pop) |
86 | pack "N", (pop) |
89 | + ($_[0] << 24) |
87 | + ($_[0] << 24) |
90 | + ($_[1] << 16) |
88 | + ($_[1] << 16) |
91 | + ($_[2] << 8); |
89 | + ($_[2] << 8); |
… | |
… | |
95 | |
93 | |
96 | Tries to parse the given IPv6 address and return it in |
94 | Tries to parse the given IPv6 address and return it in |
97 | octet form (or undef when it isn't in a parsable format). |
95 | octet form (or undef when it isn't in a parsable format). |
98 | |
96 | |
99 | Should support all forms specified by RFC 2373 (and additionally all IPv4 |
97 | Should support all forms specified by RFC 2373 (and additionally all IPv4 |
100 | forms supported by parse_ipv4). |
98 | forms supported by parse_ipv4). Note that scope-id's are not supported |
|
|
99 | (and will not parse). |
101 | |
100 | |
102 | This function works similarly to C<inet_pton AF_INET6, ...>. |
101 | This function works similarly to C<inet_pton AF_INET6, ...>. |
103 | |
102 | |
104 | =cut |
103 | =cut |
105 | |
104 | |
… | |
… | |
138 | |
137 | |
139 | # and done |
138 | # and done |
140 | pack "n*", map hex, @h, @t |
139 | pack "n*", map hex, @h, @t |
141 | } |
140 | } |
142 | |
141 | |
|
|
142 | sub parse_unix($) { |
|
|
143 | $_[0] eq "unix/" |
|
|
144 | ? pack "S", AF_UNIX |
|
|
145 | : undef |
|
|
146 | |
|
|
147 | } |
|
|
148 | |
143 | =item $ipn = parse_ip $text |
149 | =item $ipn = parse_address $text |
144 | |
150 | |
145 | Combines C<parse_ipv4> and C<parse_ipv6> in one function. |
151 | Combines C<parse_ipv4> and C<parse_ipv6> in one function. The address |
|
|
152 | here refers to the host address (not socket address) in network form |
|
|
153 | (binary). |
146 | |
154 | |
147 | =cut |
155 | If the C<$text> is C<unix/>, then this function returns a special token |
|
|
156 | recognised by the other functions in this module to mean "UNIX domain |
|
|
157 | socket". |
148 | |
158 | |
|
|
159 | =item $text = AnyEvent::Socket::aton $ipn |
|
|
160 | |
|
|
161 | Same as C<parse_address>, but not exported (think C<Socket::inet_aton> but |
|
|
162 | I<without> name resolution). |
|
|
163 | |
|
|
164 | =cut |
|
|
165 | |
149 | sub parse_ip($) { |
166 | sub parse_address($) { |
150 | &parse_ipv4 || &parse_ipv6 |
167 | &parse_ipv4 || &parse_ipv6 || &parse_unix |
151 | } |
168 | } |
152 | |
169 | |
|
|
170 | *aton = \&parse_address; |
|
|
171 | |
|
|
172 | =item ($host, $service) = parse_hostport $string[, $default_service] |
|
|
173 | |
|
|
174 | Splitting a string of the form C<hostname:port> is a common |
|
|
175 | problem. Unfortunately, just splitting on the colon makes it hard to |
|
|
176 | specify IPv6 addresses and doesn't support the less common but well |
|
|
177 | standardised C<[ip literal]> syntax. |
|
|
178 | |
|
|
179 | This function tries to do this job in a better way, it supports the |
|
|
180 | following formats, where C<port> can be a numerical port number of a |
|
|
181 | service name, or a C<name=port> string, and the C< port> and C<:port> |
|
|
182 | parts are optional. Also, everywhere where an IP address is supported |
|
|
183 | a hostname or unix domain socket address is also supported (see |
|
|
184 | C<parse_unix>). |
|
|
185 | |
|
|
186 | hostname:port e.g. "www.linux.org", "www.x.de:443", "www.x.de:https=443" |
|
|
187 | ipv4:port e.g. "198.182.196.56", "127.1:22" |
|
|
188 | ipv6 e.g. "::1", "affe::1" |
|
|
189 | [ipv4or6]:port e.g. "[::1]", "[10.0.1]:80" |
|
|
190 | [ipv4or6] port e.g. "[127.0.0.1]", "[www.x.org] 17" |
|
|
191 | ipv4or6 port e.g. "::1 443", "10.0.0.1 smtp" |
|
|
192 | |
|
|
193 | It also supports defaulting the service name in a simple way by using |
|
|
194 | C<$default_service> if no service was detected. If neither a service was |
|
|
195 | detected nor a default was specified, then this function returns the |
|
|
196 | empty list. The same happens when a parse error weas detected, such as a |
|
|
197 | hostname with a colon in it (the function is rather conservative, though). |
|
|
198 | |
|
|
199 | Example: |
|
|
200 | |
|
|
201 | print join ",", parse_hostport "localhost:443"; |
|
|
202 | # => "localhost,443" |
|
|
203 | |
|
|
204 | print join ",", parse_hostport "localhost", "https"; |
|
|
205 | # => "localhost,https" |
|
|
206 | |
|
|
207 | print join ",", parse_hostport "[::1]"; |
|
|
208 | # => "," (empty list) |
|
|
209 | |
|
|
210 | =cut |
|
|
211 | |
|
|
212 | sub parse_hostport($;$) { |
|
|
213 | my ($host, $port); |
|
|
214 | |
|
|
215 | for ("$_[0]") { # work on a copy, just in case, and also reset pos |
|
|
216 | |
|
|
217 | # parse host, special cases: "ipv6" or "ipv6 port" |
|
|
218 | unless ( |
|
|
219 | ($host) = /^\s* ([0-9a-fA-F:]*:[0-9a-fA-F:]*:[0-9a-fA-F\.:]*)/xgc |
|
|
220 | and parse_ipv6 $host |
|
|
221 | ) { |
|
|
222 | /^\s*/xgc; |
|
|
223 | |
|
|
224 | if (/^ \[ ([^\[\]]+) \]/xgc) { |
|
|
225 | $host = $1; |
|
|
226 | } elsif (/^ ([^\[\]:\ ]+) /xgc) { |
|
|
227 | $host = $1; |
|
|
228 | } else { |
|
|
229 | return; |
|
|
230 | } |
|
|
231 | } |
|
|
232 | |
|
|
233 | # parse port |
|
|
234 | if (/\G (?:\s+|:) ([^:[:space:]]+) \s*$/xgc) { |
|
|
235 | $port = $1; |
|
|
236 | } elsif (/\G\s*$/gc && length $_[1]) { |
|
|
237 | $port = $_[1]; |
|
|
238 | } else { |
|
|
239 | return; |
|
|
240 | } |
|
|
241 | } |
|
|
242 | |
|
|
243 | # hostnames must not contain :'s |
|
|
244 | return if $host =~ /:/ && !parse_ipv6 $host; |
|
|
245 | |
|
|
246 | ($host, $port) |
|
|
247 | } |
|
|
248 | |
|
|
249 | =item $sa_family = address_family $ipn |
|
|
250 | |
|
|
251 | Returns the address family/protocol-family (AF_xxx/PF_xxx, in one value :) |
|
|
252 | of the given host address in network format. |
|
|
253 | |
|
|
254 | =cut |
|
|
255 | |
|
|
256 | sub address_family($) { |
|
|
257 | 4 == length $_[0] |
|
|
258 | ? AF_INET |
|
|
259 | : 16 == length $_[0] |
|
|
260 | ? AF_INET6 |
|
|
261 | : unpack "S", $_[0] |
|
|
262 | } |
|
|
263 | |
153 | =item $text = format_ip $ipn |
264 | =item $text = format_address $ipn |
154 | |
265 | |
155 | Takes either an IPv4 address (4 octets) or and IPv6 address (16 octets) |
266 | Covnvert a host address in network format (e.g. 4 octets for IPv4 or 16 |
156 | and converts it into textual form. |
267 | octets for IPv6) and convert it into textual form. |
|
|
268 | |
|
|
269 | Returns C<unix/> for UNIX domain sockets. |
157 | |
270 | |
158 | This function works similarly to C<inet_ntop AF_INET || AF_INET6, ...>, |
271 | This function works similarly to C<inet_ntop AF_INET || AF_INET6, ...>, |
159 | except it automatically detects the address type. |
272 | except it automatically detects the address type. |
160 | |
273 | |
161 | =cut |
274 | Returns C<undef> if it cannot detect the type. |
162 | |
275 | |
163 | sub format_ip; |
276 | =item $text = AnyEvent::Socket::ntoa $ipn |
|
|
277 | |
|
|
278 | Same as format_address, but not exported (think C<inet_ntoa>). |
|
|
279 | |
|
|
280 | =cut |
|
|
281 | |
|
|
282 | sub format_address; |
164 | sub format_ip($) { |
283 | sub format_address($) { |
165 | if (4 == length $_[0]) { |
284 | my $af = address_family $_[0]; |
|
|
285 | if ($af == AF_INET) { |
166 | return join ".", unpack "C4", $_[0] |
286 | return join ".", unpack "C4", $_[0] |
167 | } elsif (16 == length $_[0]) { |
287 | } elsif ($af == AF_INET6) { |
|
|
288 | if (v0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 eq $_[0]) { |
|
|
289 | return "::"; |
|
|
290 | } elsif (v0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1 eq $_[0]) { |
|
|
291 | return "::1"; |
|
|
292 | } elsif (v0.0.0.0.0.0.0.0.0.0.0.0 eq substr $_[0], 0, 12) { |
|
|
293 | # v4compatible |
|
|
294 | return "::" . format_address substr $_[0], 12; |
168 | if (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) { |
295 | } elsif (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) { |
169 | # v4mapped |
296 | # v4mapped |
170 | return "::ffff:" . format_ip substr $_[0], 12; |
297 | return "::ffff:" . format_address substr $_[0], 12; |
|
|
298 | } elsif (v0.0.0.0.0.0.0.0.255.255.0.0 eq substr $_[0], 0, 12) { |
|
|
299 | # v4translated |
|
|
300 | return "::ffff:0:" . format_address substr $_[0], 12; |
171 | } else { |
301 | } else { |
172 | my $ip = sprintf "%x:%x:%x:%x:%x:%x:%x:%x", unpack "n8", $_[0]; |
302 | my $ip = sprintf "%x:%x:%x:%x:%x:%x:%x:%x", unpack "n8", $_[0]; |
173 | |
303 | |
|
|
304 | # this is rather sucky, I admit |
174 | $ip =~ s/^0:(?:0:)*/::/ |
305 | $ip =~ s/^0:(?:0:)*(0$)?/::/ |
175 | or $ip =~ s/(:0)+$/::/ |
306 | or $ip =~ s/(:0){7}$/::/ or $ip =~ s/(:0){7}/:/ |
176 | or $ip =~ s/(:0)+/:/; |
307 | or $ip =~ s/(:0){6}$/::/ or $ip =~ s/(:0){6}/:/ |
|
|
308 | or $ip =~ s/(:0){5}$/::/ or $ip =~ s/(:0){5}/:/ |
|
|
309 | or $ip =~ s/(:0){4}$/::/ or $ip =~ s/(:0){4}/:/ |
|
|
310 | or $ip =~ s/(:0){3}$/::/ or $ip =~ s/(:0){3}/:/ |
|
|
311 | or $ip =~ s/(:0){2}$/::/ or $ip =~ s/(:0){2}/:/ |
|
|
312 | or $ip =~ s/(:0){1}$/::/ or $ip =~ s/(:0){1}/:/; |
177 | return $ip |
313 | return $ip |
178 | } |
314 | } |
|
|
315 | } elsif ($af == AF_UNIX) { |
|
|
316 | return "unix/" |
179 | } else { |
317 | } else { |
180 | return undef |
318 | return undef |
181 | } |
319 | } |
182 | } |
320 | } |
|
|
321 | |
|
|
322 | *ntoa = \&format_address; |
183 | |
323 | |
184 | =item inet_aton $name_or_address, $cb->(@addresses) |
324 | =item inet_aton $name_or_address, $cb->(@addresses) |
185 | |
325 | |
186 | Works similarly to its Socket counterpart, except that it uses a |
326 | Works similarly to its Socket counterpart, except that it uses a |
187 | callback. Also, if a host has only an IPv6 address, this might be passed |
327 | callback. Also, if a host has only an IPv6 address, this might be passed |
188 | to the callback instead (use the length to detect this - 4 for IPv4, 16 |
328 | to the callback instead (use the length to detect this - 4 for IPv4, 16 |
189 | for IPv6). |
329 | for IPv6). |
190 | |
330 | |
191 | Unlike the L<Socket> function of the same name, you can get multiple IPv4 |
331 | Unlike the L<Socket> function of the same name, you can get multiple IPv4 |
192 | and IPv6 addresses as result. |
332 | and IPv6 addresses as result (and maybe even other adrdess types). |
193 | |
333 | |
194 | =cut |
334 | =cut |
195 | |
335 | |
196 | sub inet_aton { |
336 | sub inet_aton { |
197 | my ($name, $cb) = @_; |
337 | my ($name, $cb) = @_; |
… | |
… | |
215 | } |
355 | } |
216 | }); |
356 | }); |
217 | } |
357 | } |
218 | } |
358 | } |
219 | |
359 | |
|
|
360 | # check for broken platforms with extra field in sockaddr structure |
|
|
361 | # kind of a rfc vs. bsd issue, as usual (ok, normally it's a |
|
|
362 | # unix vs. bsd issue, a iso C vs. bsd issue or simply a |
|
|
363 | # correctness vs. bsd issue. |
|
|
364 | my $pack_family = (0x55 == Socket::sockaddr_family "\x55\x55") |
|
|
365 | ? "xC" : "S"; |
|
|
366 | |
220 | =item $sa = AnyEvent::Socket::pack_sockaddr $port, $host |
367 | =item $sa = AnyEvent::Socket::pack_sockaddr $service, $host |
221 | |
368 | |
222 | Pack the given port/host combination into a binary sockaddr structure. Handles |
369 | Pack the given port/host combination into a binary sockaddr |
223 | both IPv4 and IPv6 host addresses. |
370 | structure. Handles both IPv4 and IPv6 host addresses, as well as UNIX |
|
|
371 | domain sockets (C<$host> == C<unix/> and C<$service> == absolute |
|
|
372 | pathname). |
224 | |
373 | |
225 | =cut |
374 | =cut |
226 | |
375 | |
227 | sub pack_sockaddr($$) { |
376 | sub pack_sockaddr($$) { |
228 | if (4 == length $_[1]) { |
377 | my $af = address_family $_[1]; |
|
|
378 | |
|
|
379 | if ($af == AF_INET) { |
229 | Socket::pack_sockaddr_in $_[0], $_[1] |
380 | Socket::pack_sockaddr_in $_[0], $_[1] |
230 | } elsif (16 == length $_[1]) { |
381 | } elsif ($af == AF_INET6) { |
231 | pack "SnL a16 L", |
382 | pack "$pack_family nL a16 L", |
232 | Socket::AF_INET6, |
383 | AF_INET6, |
233 | $_[0], # port |
384 | $_[0], # port |
234 | 0, # flowinfo |
385 | 0, # flowinfo |
235 | $_[1], # addr |
386 | $_[1], # addr |
236 | 0 # scope id |
387 | 0 # scope id |
|
|
388 | } elsif ($af == AF_UNIX) { |
|
|
389 | Socket::pack_sockaddr_un $_[0] |
237 | } else { |
390 | } else { |
238 | Carp::croak "pack_sockaddr: invalid host"; |
391 | Carp::croak "pack_sockaddr: invalid host"; |
239 | } |
392 | } |
240 | } |
393 | } |
241 | |
394 | |
242 | =item ($port, $host) = AnyEvent::Socket::unpack_sockaddr $sa |
395 | =item ($service, $host) = AnyEvent::Socket::unpack_sockaddr $sa |
243 | |
396 | |
244 | Unpack the given binary sockaddr structure (as used by bind, getpeername |
397 | Unpack the given binary sockaddr structure (as used by bind, getpeername |
245 | etc.) into a C<$port, $host> combination. |
398 | etc.) into a C<$service, $host> combination. |
246 | |
399 | |
247 | Handles both IPv4 and IPv6 sockaddr structures. |
400 | For IPv4 and IPv6, C<$service> is the port number and C<$host> the host |
|
|
401 | address in network format (binary). |
|
|
402 | |
|
|
403 | For UNIX domain sockets, C<$service> is the absolute pathname and C<$host> |
|
|
404 | is a special token that is understood by the other functions in this |
|
|
405 | module (C<format_address> converts it to C<unix/>). |
248 | |
406 | |
249 | =cut |
407 | =cut |
250 | |
408 | |
251 | sub unpack_sockaddr($) { |
409 | sub unpack_sockaddr($) { |
252 | my $af = unpack "S", $_[0]; |
410 | my $af = Socket::sockaddr_family $_[0]; |
253 | |
411 | |
254 | if ($af == &Socket::AF_INET) { |
412 | if ($af == AF_INET) { |
255 | Socket::unpack_sockaddr_in $_[0] |
413 | Socket::unpack_sockaddr_in $_[0] |
256 | } elsif ($af == AF_INET6) { |
414 | } elsif ($af == AF_INET6) { |
257 | (unpack "SnL a16 L")[1, 3] |
415 | unpack "x2 n x4 a16", $_[0] |
|
|
416 | } elsif ($af == AF_UNIX) { |
|
|
417 | ((Socket::unpack_sockaddr_un $_[0]), pack "S", AF_UNIX) |
258 | } else { |
418 | } else { |
259 | Carp::croak "unpack_sockaddr: unsupported protocol family $af"; |
419 | Carp::croak "unpack_sockaddr: unsupported protocol family $af"; |
260 | } |
420 | } |
261 | } |
421 | } |
262 | |
422 | |
263 | sub _tcp_port($) { |
423 | =item resolve_sockaddr $node, $service, $proto, $family, $type, $cb->([$family, $type, $proto, $sockaddr], ...) |
264 | $_[0] =~ /^(\d*)$/ and return $1*1; |
|
|
265 | |
424 | |
266 | (getservbyname $_[0], "tcp")[2] |
425 | Tries to resolve the given nodename and service name into protocol families |
|
|
426 | and sockaddr structures usable to connect to this node and service in a |
|
|
427 | protocol-independent way. It works remotely similar to the getaddrinfo |
|
|
428 | posix function. |
|
|
429 | |
|
|
430 | For internet addresses, C<$node> is either an IPv4 or IPv6 address or an |
|
|
431 | internet hostname, and C<$service> is either a service name (port name |
|
|
432 | from F</etc/services>) or a numerical port number. If both C<$node> and |
|
|
433 | C<$service> are names, then SRV records will be consulted to find the real |
|
|
434 | service, otherwise they will be used as-is. If you know that the service |
|
|
435 | name is not in your services database, then you can specify the service in |
|
|
436 | the format C<name=port> (e.g. C<http=80>). |
|
|
437 | |
|
|
438 | For UNIX domain sockets, C<$node> must be the string C<unix/> and |
|
|
439 | C<$service> must be the absolute pathname of the socket. In this case, |
|
|
440 | C<$proto> will be ignored. |
|
|
441 | |
|
|
442 | C<$proto> must be a protocol name, currently C<tcp>, C<udp> or |
|
|
443 | C<sctp>. The default is currently C<tcp>, but in the future, this function |
|
|
444 | might try to use other protocols such as C<sctp>, depending on the socket |
|
|
445 | type and any SRV records it might find. |
|
|
446 | |
|
|
447 | C<$family> must be either C<0> (meaning any protocol is OK), C<4> (use |
|
|
448 | only IPv4) or C<6> (use only IPv6). The default is influenced by |
|
|
449 | C<$ENV{PERL_ANYEVENT_PROTOCOLS}>. |
|
|
450 | |
|
|
451 | C<$type> must be C<SOCK_STREAM>, C<SOCK_DGRAM> or C<SOCK_SEQPACKET> (or |
|
|
452 | C<undef> in which case it gets automatically chosen to be C<SOCK_STREAM> |
|
|
453 | unless C<$proto> is C<udp>). |
|
|
454 | |
|
|
455 | The callback will receive zero or more array references that contain |
|
|
456 | C<$family, $type, $proto> for use in C<socket> and a binary |
|
|
457 | C<$sockaddr> for use in C<connect> (or C<bind>). |
|
|
458 | |
|
|
459 | The application should try these in the order given. |
|
|
460 | |
|
|
461 | Example: |
|
|
462 | |
|
|
463 | resolve_sockaddr "google.com", "http", 0, undef, undef, sub { ... }; |
|
|
464 | |
|
|
465 | =cut |
|
|
466 | |
|
|
467 | # microsoft can't even get getprotobyname working (the etc/protocols file |
|
|
468 | # gets lost fairly often on windows), so we have to hardcode some common |
|
|
469 | # protocol numbers ourselves. |
|
|
470 | our %PROTO_BYNAME; |
|
|
471 | |
|
|
472 | $PROTO_BYNAME{tcp} = &Socket::IPPROTO_TCP if defined &Socket::IPPROTO_TCP; |
|
|
473 | $PROTO_BYNAME{udp} = &Socket::IPPROTO_UDP if defined &Socket::IPPROTO_UDP; |
|
|
474 | $PROTO_BYNAME{icmp} = &Socket::IPPROTO_ICMP if defined &Socket::IPPROTO_ICMP; |
|
|
475 | |
|
|
476 | sub resolve_sockaddr($$$$$$) { |
|
|
477 | my ($node, $service, $proto, $family, $type, $cb) = @_; |
|
|
478 | |
|
|
479 | if ($node eq "unix/") { |
|
|
480 | return $cb->() if $family || $service !~ /^\//; # no can do |
|
|
481 | |
|
|
482 | return $cb->([AF_UNIX, defined $type ? $type : SOCK_STREAM, 0, Socket::pack_sockaddr_un $service]); |
|
|
483 | } |
|
|
484 | |
|
|
485 | unless (AF_INET6) { |
|
|
486 | $family != 6 |
|
|
487 | or return $cb->(); |
|
|
488 | |
|
|
489 | $family = 4; |
|
|
490 | } |
|
|
491 | |
|
|
492 | $cb->() if $family == 4 && !$AnyEvent::PROTOCOL{ipv4}; |
|
|
493 | $cb->() if $family == 6 && !$AnyEvent::PROTOCOL{ipv6}; |
|
|
494 | |
|
|
495 | $family ||= 4 unless $AnyEvent::PROTOCOL{ipv6}; |
|
|
496 | $family ||= 6 unless $AnyEvent::PROTOCOL{ipv4}; |
|
|
497 | |
|
|
498 | $proto ||= "tcp"; |
|
|
499 | $type ||= $proto eq "udp" ? SOCK_DGRAM : SOCK_STREAM; |
|
|
500 | |
|
|
501 | my $proton = $PROTO_BYNAME{lc $proto} || (getprotobyname $proto)[2] |
267 | or Carp::croak "$_[0]: service unknown" |
502 | or Carp::croak "$proto: protocol unknown"; |
|
|
503 | |
|
|
504 | my $port; |
|
|
505 | |
|
|
506 | if ($service =~ /^(\S+)=(\d+)$/) { |
|
|
507 | ($service, $port) = ($1, $2); |
|
|
508 | } elsif ($service =~ /^\d+$/) { |
|
|
509 | ($service, $port) = (undef, $service); |
|
|
510 | } else { |
|
|
511 | $port = (getservbyname $service, $proto)[2] |
|
|
512 | or Carp::croak "$service/$proto: service unknown"; |
|
|
513 | } |
|
|
514 | |
|
|
515 | my @target = [$node, $port]; |
|
|
516 | |
|
|
517 | # resolve a records / provide sockaddr structures |
|
|
518 | my $resolve = sub { |
|
|
519 | my @res; |
|
|
520 | my $cv = AnyEvent->condvar (cb => sub { |
|
|
521 | $cb->( |
|
|
522 | map $_->[2], |
|
|
523 | sort { |
|
|
524 | $AnyEvent::PROTOCOL{$b->[1]} <=> $AnyEvent::PROTOCOL{$a->[1]} |
|
|
525 | or $a->[0] <=> $b->[0] |
|
|
526 | } |
|
|
527 | @res |
|
|
528 | ) |
|
|
529 | }); |
|
|
530 | |
|
|
531 | $cv->begin; |
|
|
532 | for my $idx (0 .. $#target) { |
|
|
533 | my ($node, $port) = @{ $target[$idx] }; |
|
|
534 | |
|
|
535 | if (my $noden = parse_address $node) { |
|
|
536 | my $af = address_family $noden; |
|
|
537 | |
|
|
538 | if ($af == AF_INET && $family != 6) { |
|
|
539 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
|
|
540 | pack_sockaddr $port, $noden]] |
|
|
541 | } |
|
|
542 | |
|
|
543 | if ($af == AF_INET6 && $family != 4) { |
|
|
544 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
|
|
545 | pack_sockaddr $port, $noden]] |
|
|
546 | } |
|
|
547 | } else { |
|
|
548 | # ipv4 |
|
|
549 | if ($family != 6) { |
|
|
550 | $cv->begin; |
|
|
551 | AnyEvent::DNS::a $node, sub { |
|
|
552 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
|
|
553 | pack_sockaddr $port, parse_ipv4 $_]] |
|
|
554 | for @_; |
|
|
555 | $cv->end; |
|
|
556 | }; |
|
|
557 | } |
|
|
558 | |
|
|
559 | # ipv6 |
|
|
560 | if ($family != 4) { |
|
|
561 | $cv->begin; |
|
|
562 | AnyEvent::DNS::aaaa $node, sub { |
|
|
563 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
|
|
564 | pack_sockaddr $port, parse_ipv6 $_]] |
|
|
565 | for @_; |
|
|
566 | $cv->end; |
|
|
567 | }; |
|
|
568 | } |
|
|
569 | } |
|
|
570 | } |
|
|
571 | $cv->end; |
|
|
572 | }; |
|
|
573 | |
|
|
574 | # try srv records, if applicable |
|
|
575 | if ($node eq "localhost") { |
|
|
576 | @target = (["127.0.0.1", $port], ["::1", $port]); |
|
|
577 | &$resolve; |
|
|
578 | } elsif (defined $service && !parse_address $node) { |
|
|
579 | AnyEvent::DNS::srv $service, $proto, $node, sub { |
|
|
580 | my (@srv) = @_; |
|
|
581 | |
|
|
582 | # no srv records, continue traditionally |
|
|
583 | @srv |
|
|
584 | or return &$resolve; |
|
|
585 | |
|
|
586 | # the only srv record has "." ("" here) => abort |
|
|
587 | $srv[0][2] ne "" || $#srv |
|
|
588 | or return $cb->(); |
|
|
589 | |
|
|
590 | # use srv records then |
|
|
591 | @target = map ["$_->[3].", $_->[2]], |
|
|
592 | grep $_->[3] ne ".", |
|
|
593 | @srv; |
|
|
594 | |
|
|
595 | &$resolve; |
|
|
596 | }; |
|
|
597 | } else { |
|
|
598 | &$resolve; |
|
|
599 | } |
268 | } |
600 | } |
269 | |
601 | |
270 | =item $guard = tcp_connect $host, $service, $connect_cb[, $prepare_cb] |
602 | =item $guard = tcp_connect $host, $service, $connect_cb[, $prepare_cb] |
271 | |
603 | |
272 | This is a convenience function that creates a TCP socket and makes a 100% |
604 | This is a convenience function that creates a TCP socket and makes a 100% |
273 | non-blocking connect to the given C<$host> (which can be a hostname or a |
605 | non-blocking connect to the given C<$host> (which can be a hostname or |
|
|
606 | a textual IP address, or the string C<unix/> for UNIX domain sockets) |
274 | textual IP address) and C<$service> (which can be a numeric port number or |
607 | and C<$service> (which can be a numeric port number or a service name, |
275 | a service name, or a C<servicename=portnumber> string). |
608 | or a C<servicename=portnumber> string, or the pathname to a UNIX domain |
|
|
609 | socket). |
276 | |
610 | |
277 | If both C<$host> and C<$port> are names, then this function will use SRV |
611 | If both C<$host> and C<$port> are names, then this function will use SRV |
278 | records to locate the real target(s). |
612 | records to locate the real target(s). |
279 | |
613 | |
280 | In either case, it will create a list of target hosts (e.g. for multihomed |
614 | In either case, it will create a list of target hosts (e.g. for multihomed |
… | |
… | |
312 | timeout is to be used). |
646 | timeout is to be used). |
313 | |
647 | |
314 | Note that the socket could be either a IPv4 TCP socket or an IPv6 TCP |
648 | Note that the socket could be either a IPv4 TCP socket or an IPv6 TCP |
315 | socket (although only IPv4 is currently supported by this module). |
649 | socket (although only IPv4 is currently supported by this module). |
316 | |
650 | |
|
|
651 | Note to the poor Microsoft Windows users: Windows (of course) doesn't |
|
|
652 | correctly signal connection errors, so unless your event library works |
|
|
653 | around this, failed connections will simply hang. The only event libraries |
|
|
654 | that handle this condition correctly are L<EV> and L<Glib>. Additionally, |
|
|
655 | AnyEvent works around this bug with L<Event> and in its pure-perl |
|
|
656 | backend. All other libraries cannot correctly handle this condition. To |
|
|
657 | lessen the impact of this windows bug, a default timeout of 30 seconds |
|
|
658 | will be imposed on windows. Cygwin is not affected. |
|
|
659 | |
317 | Simple Example: connect to localhost on port 22. |
660 | Simple Example: connect to localhost on port 22. |
318 | |
661 | |
319 | tcp_connect localhost => 22, sub { |
662 | tcp_connect localhost => 22, sub { |
320 | my $fh = shift |
663 | my $fh = shift |
321 | or die "unable to connect: $!"; |
664 | or die "unable to connect: $!"; |
322 | # do something |
665 | # do something |
323 | }; |
666 | }; |
324 | |
667 | |
325 | Complex Example: connect to www.google.com on port 80 and make a simple |
668 | Complex Example: connect to www.google.com on port 80 and make a simple |
326 | GET request without much error handling. Also limit the connection timeout |
669 | GET request without much error handling. Also limit the connection timeout |
327 | to 15 seconds. |
670 | to 15 seconds. |
328 | |
671 | |
… | |
… | |
358 | # could call $fh->bind etc. here |
701 | # could call $fh->bind etc. here |
359 | |
702 | |
360 | 15 |
703 | 15 |
361 | }; |
704 | }; |
362 | |
705 | |
|
|
706 | Example: connect to a UNIX domain socket. |
|
|
707 | |
|
|
708 | tcp_connect "unix/", "/tmp/.X11-unix/X0", sub { |
|
|
709 | ... |
|
|
710 | } |
|
|
711 | |
363 | =cut |
712 | =cut |
364 | |
713 | |
365 | sub tcp_connect($$$;$) { |
714 | sub tcp_connect($$$;$) { |
366 | my ($host, $port, $connect, $prepare) = @_; |
715 | my ($host, $port, $connect, $prepare) = @_; |
367 | |
716 | |
368 | # see http://cr.yp.to/docs/connect.html for some background |
717 | # see http://cr.yp.to/docs/connect.html for some background |
|
|
718 | # also http://advogato.org/article/672.html |
369 | |
719 | |
370 | my %state = ( fh => undef ); |
720 | my %state = ( fh => undef ); |
371 | |
721 | |
372 | # name resolution |
722 | # name/service to type/sockaddr resolution |
373 | AnyEvent::DNS::addr $host, $port, 0, 0, 0, sub { |
723 | resolve_sockaddr $host, $port, 0, 0, undef, sub { |
374 | my @target = @_; |
724 | my @target = @_; |
375 | |
725 | |
376 | $state{next} = sub { |
726 | $state{next} = sub { |
377 | return unless exists $state{fh}; |
727 | return unless exists $state{fh}; |
378 | |
728 | |
… | |
… | |
388 | socket $state{fh}, $domain, $type, $proto |
738 | socket $state{fh}, $domain, $type, $proto |
389 | or return $state{next}(); |
739 | or return $state{next}(); |
390 | |
740 | |
391 | fh_nonblocking $state{fh}, 1; |
741 | fh_nonblocking $state{fh}, 1; |
392 | |
742 | |
393 | # prepare and optional timeout |
|
|
394 | if ($prepare) { |
|
|
395 | my $timeout = $prepare->($state{fh}); |
743 | my $timeout = $prepare && $prepare->($state{fh}); |
396 | |
744 | |
|
|
745 | $timeout ||= 30 if AnyEvent::WIN32; |
|
|
746 | |
397 | $state{to} = AnyEvent->timer (after => $timeout, cb => sub { |
747 | $state{to} = AnyEvent->timer (after => $timeout, cb => sub { |
398 | $! = &Errno::ETIMEDOUT; |
748 | $! = &Errno::ETIMEDOUT; |
399 | $state{next}(); |
749 | $state{next}(); |
400 | }) if $timeout; |
750 | }) if $timeout; |
401 | } |
|
|
402 | |
751 | |
403 | # called when the connect was successful, which, |
752 | # called when the connect was successful, which, |
404 | # in theory, could be the case immediately (but never is in practise) |
753 | # in theory, could be the case immediately (but never is in practise) |
405 | my $connected = sub { |
754 | $state{connected} = sub { |
406 | delete $state{ww}; |
755 | delete $state{ww}; |
407 | delete $state{to}; |
756 | delete $state{to}; |
408 | |
757 | |
409 | # we are connected, or maybe there was an error |
758 | # we are connected, or maybe there was an error |
410 | if (my $sin = getpeername $state{fh}) { |
759 | if (my $sin = getpeername $state{fh}) { |
411 | my ($port, $host) = unpack_sockaddr $sin; |
760 | my ($port, $host) = unpack_sockaddr $sin; |
412 | |
761 | |
413 | my $guard = guard { |
762 | my $guard = guard { %state = () }; |
414 | %state = (); |
|
|
415 | }; |
|
|
416 | |
763 | |
417 | $connect->($state{fh}, format_ip $host, $port, sub { |
764 | $connect->(delete $state{fh}, format_address $host, $port, sub { |
418 | $guard->cancel; |
765 | $guard->cancel; |
419 | $state{next}(); |
766 | $state{next}(); |
420 | }); |
767 | }); |
421 | } else { |
768 | } else { |
422 | # dummy read to fetch real error code |
769 | # dummy read to fetch real error code |
… | |
… | |
425 | } |
772 | } |
426 | }; |
773 | }; |
427 | |
774 | |
428 | # now connect |
775 | # now connect |
429 | if (connect $state{fh}, $sockaddr) { |
776 | if (connect $state{fh}, $sockaddr) { |
430 | $connected->(); |
777 | $state{connected}->(); |
431 | } elsif ($! == &Errno::EINPROGRESS || $! == &Errno::EWOULDBLOCK) { # EINPROGRESS is POSIX |
778 | } elsif ($! == &Errno::EINPROGRESS # POSIX |
|
|
779 | || $! == &Errno::EWOULDBLOCK |
|
|
780 | # WSAEINPROGRESS intentionally not checked - it means something else entirely |
|
|
781 | || $! == AnyEvent::Util::WSAEINVAL # not convinced, but doesn't hurt |
|
|
782 | || $! == AnyEvent::Util::WSAEWOULDBLOCK) { |
432 | $state{ww} = AnyEvent->io (fh => $state{fh}, poll => 'w', cb => $connected); |
783 | $state{ww} = AnyEvent->io (fh => $state{fh}, poll => 'w', cb => $state{connected}); |
433 | } else { |
784 | } else { |
434 | %state = (); |
785 | $state{next}(); |
435 | $connect->(); |
|
|
436 | } |
786 | } |
437 | }; |
787 | }; |
438 | |
788 | |
439 | $! = &Errno::ENXIO; |
789 | $! = &Errno::ENXIO; |
440 | $state{next}(); |
790 | $state{next}(); |
441 | }; |
791 | }; |
442 | |
792 | |
443 | defined wantarray && guard { %state = () } |
793 | defined wantarray && guard { %state = () } |
444 | } |
794 | } |
445 | |
795 | |
446 | =item $guard = tcp_server $host, $port, $accept_cb[, $prepare_cb] |
796 | =item $guard = tcp_server $host, $service, $accept_cb[, $prepare_cb] |
447 | |
797 | |
448 | Create and bind a TCP socket to the given host (any IPv4 host if undef, |
798 | Create and bind a stream socket to the given host, and port, set the |
449 | otherwise it must be an IPv4 or IPv6 address) and port (service name or |
799 | SO_REUSEADDR flag (if applicable) and call C<listen>. Unlike the name |
450 | numeric port number, or an ephemeral port if given as zero or undef), set |
800 | implies, this function can also bind on UNIX domain sockets. |
451 | the SO_REUSEADDR flag and call C<listen>. |
|
|
452 | |
801 | |
|
|
802 | For internet sockets, C<$host> must be an IPv4 or IPv6 address (or |
|
|
803 | C<undef>, in which case it binds either to C<0> or to C<::>, depending |
|
|
804 | on whether IPv4 or IPv6 is the preferred protocol, and maybe to both in |
|
|
805 | future versions, as applicable). |
|
|
806 | |
|
|
807 | To bind to the IPv4 wildcard address, use C<0>, to bind to the IPv6 |
|
|
808 | wildcard address, use C<::>. |
|
|
809 | |
|
|
810 | The port is specified by C<$service>, which must be either a service name or |
|
|
811 | a numeric port number (or C<0> or C<undef>, in which case an ephemeral |
|
|
812 | port will be used). |
|
|
813 | |
|
|
814 | For UNIX domain sockets, C<$host> must be C<unix/> and C<$service> must be |
|
|
815 | the absolute pathname of the socket. This function will try to C<unlink> |
|
|
816 | the socket before it tries to bind to it. See SECURITY CONSIDERATIONS, |
|
|
817 | below. |
|
|
818 | |
453 | For each new connection that could be C<accept>ed, call the C<$accept_cb> |
819 | For each new connection that could be C<accept>ed, call the C<< |
454 | with the file handle (in non-blocking mode) as first and the peer host and |
820 | $accept_cb->($fh, $host, $port) >> with the file handle (in non-blocking |
455 | port as second and third arguments (see C<tcp_connect> for details). |
821 | mode) as first and the peer host and port as second and third arguments |
|
|
822 | (see C<tcp_connect> for details). |
456 | |
823 | |
457 | Croaks on any errors. |
824 | Croaks on any errors it can detect before the listen. |
458 | |
825 | |
459 | If called in non-void context, then this function returns a guard object |
826 | If called in non-void context, then this function returns a guard object |
460 | whose lifetime it tied to the TCP server: If the object gets destroyed, |
827 | whose lifetime it tied to the TCP server: If the object gets destroyed, |
461 | the server will be stopped (but existing accepted connections will |
828 | the server will be stopped (but existing accepted connections will |
462 | continue). |
829 | continue). |
463 | |
830 | |
464 | If you need more control over the listening socket, you can provide a |
831 | If you need more control over the listening socket, you can provide a |
465 | C<$prepare_cb>, which is called just before the C<listen ()> call, with |
832 | C<< $prepare_cb->($fh, $host, $port) >>, which is called just before the |
466 | the listen file handle as first argument. |
833 | C<listen ()> call, with the listen file handle as first argument, and IP |
|
|
834 | address and port number of the local socket endpoint as second and third |
|
|
835 | arguments. |
467 | |
836 | |
468 | It should return the length of the listen queue (or C<0> for the default). |
837 | It should return the length of the listen queue (or C<0> for the default). |
469 | |
838 | |
|
|
839 | Note to IPv6 users: RFC-compliant behaviour for IPv6 sockets listening on |
|
|
840 | C<::> is to bind to both IPv6 and IPv4 addresses by default on dual-stack |
|
|
841 | hosts. Unfortunately, only GNU/Linux seems to implement this properly, so |
|
|
842 | if you want both IPv4 and IPv6 listening sockets you should create the |
|
|
843 | IPv6 socket first and then attempt to bind on the IPv4 socket, but ignore |
|
|
844 | any C<EADDRINUSE> errors. |
|
|
845 | |
470 | Example: bind on TCP port 8888 on the local machine and tell each client |
846 | Example: bind on some TCP port on the local machine and tell each client |
471 | to go away. |
847 | to go away. |
472 | |
848 | |
473 | tcp_server undef, 8888, sub { |
849 | tcp_server undef, undef, sub { |
474 | my ($fh, $host, $port) = @_; |
850 | my ($fh, $host, $port) = @_; |
475 | |
851 | |
476 | syswrite $fh, "The internet is full, $host:$port. Go away!\015\012"; |
852 | syswrite $fh, "The internet is full, $host:$port. Go away!\015\012"; |
|
|
853 | }, sub { |
|
|
854 | my ($fh, $thishost, $thisport) = @_; |
|
|
855 | warn "bound to $thishost, port $thisport\n"; |
477 | }; |
856 | }; |
478 | |
857 | |
|
|
858 | Example: bind a server on a unix domain socket. |
|
|
859 | |
|
|
860 | tcp_server "unix/", "/tmp/mydir/mysocket", sub { |
|
|
861 | my ($fh) = @_; |
|
|
862 | }; |
|
|
863 | |
479 | =cut |
864 | =cut |
480 | |
865 | |
481 | sub tcp_server($$$;$) { |
866 | sub tcp_server($$$;$) { |
482 | my ($host, $port, $accept, $prepare) = @_; |
867 | my ($host, $service, $accept, $prepare) = @_; |
|
|
868 | |
|
|
869 | $host = $AnyEvent::PROTOCOL{ipv4} < $AnyEvent::PROTOCOL{ipv6} && AF_INET6 |
|
|
870 | ? "::" : "0" |
|
|
871 | unless defined $host; |
|
|
872 | |
|
|
873 | my $ipn = parse_address $host |
|
|
874 | or Carp::croak "AnyEvent::Socket::tcp_server: cannot parse '$host' as host address"; |
|
|
875 | |
|
|
876 | my $af = address_family $ipn; |
483 | |
877 | |
484 | my %state; |
878 | my %state; |
485 | |
879 | |
486 | socket $state{fh}, &Socket::AF_INET, &Socket::SOCK_STREAM, 0 |
880 | # win32 perl is too stupid to get this right :/ |
|
|
881 | Carp::croak "tcp_server/socket: address family not supported" |
|
|
882 | if AnyEvent::WIN32 && $af == AF_UNIX; |
|
|
883 | |
|
|
884 | socket $state{fh}, $af, SOCK_STREAM, 0 |
487 | or Carp::croak "socket: $!"; |
885 | or Carp::croak "tcp_server/socket: $!"; |
488 | |
886 | |
|
|
887 | if ($af == AF_INET || $af == AF_INET6) { |
489 | setsockopt $state{fh}, &Socket::SOL_SOCKET, &Socket::SO_REUSEADDR, 1 |
888 | setsockopt $state{fh}, SOL_SOCKET, SO_REUSEADDR, 1 |
490 | or Carp::croak "so_reuseaddr: $!"; |
889 | or Carp::croak "tcp_server/so_reuseaddr: $!" |
|
|
890 | unless AnyEvent::WIN32; # work around windows bug |
491 | |
891 | |
492 | bind $state{fh}, Socket::pack_sockaddr_in _tcp_port $port, socket_inet_aton ($host || "0.0.0.0") |
892 | unless ($service =~ /^\d*$/) { |
|
|
893 | $service = (getservbyname $service, "tcp")[2] |
|
|
894 | or Carp::croak "$service: service unknown" |
|
|
895 | } |
|
|
896 | } elsif ($af == AF_UNIX) { |
|
|
897 | unlink $service; |
|
|
898 | } |
|
|
899 | |
|
|
900 | bind $state{fh}, pack_sockaddr $service, $ipn |
493 | or Carp::croak "bind: $!"; |
901 | or Carp::croak "bind: $!"; |
494 | |
902 | |
495 | fh_nonblocking $state{fh}, 1; |
903 | fh_nonblocking $state{fh}, 1; |
496 | |
904 | |
497 | my $len = ($prepare && $prepare->($state{fh})) || 128; |
905 | my $len; |
|
|
906 | |
|
|
907 | if ($prepare) { |
|
|
908 | my ($service, $host) = unpack_sockaddr getsockname $state{fh}; |
|
|
909 | $len = $prepare && $prepare->($state{fh}, format_address $host, $service); |
|
|
910 | } |
|
|
911 | |
|
|
912 | $len ||= 128; |
498 | |
913 | |
499 | listen $state{fh}, $len |
914 | listen $state{fh}, $len |
500 | or Carp::croak "listen: $!"; |
915 | or Carp::croak "listen: $!"; |
501 | |
916 | |
502 | $state{aw} = AnyEvent->io (fh => $state{fh}, poll => 'r', cb => sub { |
917 | $state{aw} = AnyEvent->io (fh => $state{fh}, poll => 'r', cb => sub { |
503 | # this closure keeps $state alive |
918 | # this closure keeps $state alive |
504 | while (my $peer = accept my $fh, $state{fh}) { |
919 | while (my $peer = accept my $fh, $state{fh}) { |
505 | fh_nonblocking $fh, 1; # POSIX requires inheritance, the outside world does not |
920 | fh_nonblocking $fh, 1; # POSIX requires inheritance, the outside world does not |
|
|
921 | |
506 | my ($port, $host) = Socket::unpack_sockaddr_in $peer; |
922 | my ($service, $host) = unpack_sockaddr $peer; |
507 | $accept->($fh, (Socket::inet_ntoa $host), $port); |
923 | $accept->($fh, format_address $host, $service); |
508 | } |
924 | } |
509 | }); |
925 | }); |
510 | |
926 | |
511 | defined wantarray |
927 | defined wantarray |
512 | ? guard { %state = () } # clear fh and watcher, which breaks the circular dependency |
928 | ? guard { %state = () } # clear fh and watcher, which breaks the circular dependency |
… | |
… | |
515 | |
931 | |
516 | 1; |
932 | 1; |
517 | |
933 | |
518 | =back |
934 | =back |
519 | |
935 | |
|
|
936 | =head1 SECURITY CONSIDERATIONS |
|
|
937 | |
|
|
938 | This module is quite powerful, with with power comes the ability to abuse |
|
|
939 | as well: If you accept "hostnames" and ports from untrusted sources, |
|
|
940 | then note that this can be abused to delete files (host=C<unix/>). This |
|
|
941 | is not really a problem with this module, however, as blindly accepting |
|
|
942 | any address and protocol and trying to bind a server or connect to it is |
|
|
943 | harmful in general. |
|
|
944 | |
520 | =head1 AUTHOR |
945 | =head1 AUTHOR |
521 | |
946 | |
522 | Marc Lehmann <schmorp@schmorp.de> |
947 | Marc Lehmann <schmorp@schmorp.de> |
523 | http://home.schmorp.de/ |
948 | http://home.schmorp.de/ |
524 | |
949 | |