… | |
… | |
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 |
… | |
… | |
33 | |
33 | |
34 | =cut |
34 | =cut |
35 | |
35 | |
36 | package AnyEvent::Socket; |
36 | package AnyEvent::Socket; |
37 | |
37 | |
38 | no warnings; |
|
|
39 | use strict; |
|
|
40 | |
|
|
41 | use Carp (); |
38 | use Carp (); |
42 | use Errno (); |
39 | use Errno (); |
43 | use Socket qw(AF_INET AF_UNIX SOCK_STREAM SOCK_DGRAM SOL_SOCKET SO_REUSEADDR); |
40 | use Socket qw(AF_INET AF_UNIX SOCK_STREAM SOCK_DGRAM SOL_SOCKET SO_REUSEADDR); |
44 | |
41 | |
45 | use AnyEvent (); |
42 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
46 | use AnyEvent::Util qw(guard fh_nonblocking AF_INET6); |
43 | use AnyEvent::Util qw(guard fh_nonblocking AF_INET6); |
47 | use AnyEvent::DNS (); |
44 | use AnyEvent::DNS (); |
48 | |
45 | |
49 | use base 'Exporter'; |
46 | use base 'Exporter'; |
50 | |
47 | |
51 | our @EXPORT = qw( |
48 | our @EXPORT = qw( |
|
|
49 | getprotobyname |
|
|
50 | parse_hostport format_hostport |
52 | parse_ipv4 parse_ipv6 |
51 | parse_ipv4 parse_ipv6 |
53 | parse_ip parse_address |
52 | parse_ip parse_address |
|
|
53 | format_ipv4 format_ipv6 |
54 | format_ip format_address |
54 | format_ip format_address |
55 | address_family |
55 | address_family |
56 | inet_aton |
56 | inet_aton |
57 | tcp_server |
57 | tcp_server |
58 | tcp_connect |
58 | tcp_connect |
59 | ); |
59 | ); |
60 | |
60 | |
61 | our $VERSION = '1.0'; |
61 | our $VERSION = $AnyEvent::VERSION; |
|
|
62 | |
|
|
63 | # used in cases where we may return immediately but want the |
|
|
64 | # caller to do stuff first |
|
|
65 | sub _postpone { |
|
|
66 | my ($cb, @args) = (@_, $!); |
|
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67 | |
|
|
68 | my $w; $w = AE::timer 0, 0, sub { |
|
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69 | undef $w; |
|
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70 | $! = pop @args; |
|
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71 | $cb->(@args); |
|
|
72 | }; |
|
|
73 | } |
62 | |
74 | |
63 | =item $ipn = parse_ipv4 $dotted_quad |
75 | =item $ipn = parse_ipv4 $dotted_quad |
64 | |
76 | |
65 | Tries to parse the given dotted quad IPv4 address and return it in |
77 | Tries to parse the given dotted quad IPv4 address and return it in |
66 | octet form (or undef when it isn't in a parsable format). Supports all |
78 | octet form (or undef when it isn't in a parsable format). Supports all |
… | |
… | |
78 | |
90 | |
79 | # check leading parts against range |
91 | # check leading parts against range |
80 | return undef if grep $_ >= 256, @_[0 .. @_ - 2]; |
92 | return undef if grep $_ >= 256, @_[0 .. @_ - 2]; |
81 | |
93 | |
82 | # check trailing part against range |
94 | # check trailing part against range |
83 | return undef if $_[-1] >= 1 << (8 * (4 - $#_)); |
95 | return undef if $_[-1] >= 2 ** (8 * (4 - $#_)); |
84 | |
96 | |
85 | pack "N", (pop) |
97 | pack "N", (pop) |
86 | + ($_[0] << 24) |
98 | + ($_[0] << 24) |
87 | + ($_[1] << 16) |
99 | + ($_[1] << 16) |
88 | + ($_[2] << 8); |
100 | + ($_[2] << 8); |
… | |
… | |
143 | ? pack "S", AF_UNIX |
155 | ? pack "S", AF_UNIX |
144 | : undef |
156 | : undef |
145 | |
157 | |
146 | } |
158 | } |
147 | |
159 | |
148 | =item $ipn = parse_address $text |
160 | =item $ipn = parse_address $ip |
149 | |
161 | |
150 | Combines C<parse_ipv4> and C<parse_ipv6> in one function. The address |
162 | Combines C<parse_ipv4> and C<parse_ipv6> in one function. The address |
151 | here refers to the host address (not socket address) in network form |
163 | here refers to the host address (not socket address) in network form |
152 | (binary). |
164 | (binary). |
153 | |
165 | |
154 | If the C<$text> is C<unix/>, then this function returns a special token |
166 | If the C<$text> is C<unix/>, then this function returns a special token |
155 | recognised by the other functions in this module to mean "UNIX domain |
167 | recognised by the other functions in this module to mean "UNIX domain |
156 | socket". |
168 | socket". |
157 | |
169 | |
|
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170 | If the C<$text> to parse is a mapped IPv4 in IPv6 address (:ffff::<ipv4>), |
|
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171 | then it will be treated as an IPv4 address. If you don't want that, you |
|
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172 | have to call C<parse_ipv4> and/or C<parse_ipv6> manually. |
|
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173 | |
|
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174 | =item $ipn = AnyEvent::Socket::aton $ip |
|
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175 | |
|
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176 | Same as C<parse_address>, but not exported (think C<Socket::inet_aton> but |
|
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177 | I<without> name resolution). |
|
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178 | |
158 | =cut |
179 | =cut |
159 | |
180 | |
160 | sub parse_address($) { |
181 | sub parse_address($) { |
161 | &parse_ipv4 || &parse_ipv6 || &parse_unix |
182 | for (&parse_ipv6) { |
|
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183 | if ($_) { |
|
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184 | s/^\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff//; |
|
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185 | return $_; |
|
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186 | } else { |
|
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187 | return &parse_ipv4 || &parse_unix |
|
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188 | } |
|
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189 | } |
162 | } |
190 | } |
163 | |
191 | |
164 | *parse_ip =\&parse_address; #d# |
192 | *aton = \&parse_address; |
|
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193 | |
|
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194 | =item ($name, $aliases, $proto) = getprotobyname $name |
|
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195 | |
|
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196 | Works like the builtin function of the same name, except it tries hard to |
|
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197 | work even on broken platforms (well, that's windows), where getprotobyname |
|
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198 | is traditionally very unreliable. |
|
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199 | |
|
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200 | =cut |
|
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201 | |
|
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202 | # microsoft can't even get getprotobyname working (the etc/protocols file |
|
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203 | # gets lost fairly often on windows), so we have to hardcode some common |
|
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204 | # protocol numbers ourselves. |
|
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205 | our %PROTO_BYNAME; |
|
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206 | |
|
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207 | $PROTO_BYNAME{tcp} = Socket::IPPROTO_TCP () if defined &Socket::IPPROTO_TCP; |
|
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208 | $PROTO_BYNAME{udp} = Socket::IPPROTO_UDP () if defined &Socket::IPPROTO_UDP; |
|
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209 | $PROTO_BYNAME{icmp} = Socket::IPPROTO_ICMP() if defined &Socket::IPPROTO_ICMP; |
|
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210 | |
|
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211 | sub getprotobyname($) { |
|
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212 | my $name = lc shift; |
|
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213 | |
|
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214 | defined (my $proton = $PROTO_BYNAME{$name} || (getprotobyname $name)[2]) |
|
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215 | or return; |
|
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216 | |
|
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217 | ($name, uc $name, $proton) |
|
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218 | } |
|
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219 | |
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220 | =item ($host, $service) = parse_hostport $string[, $default_service] |
|
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221 | |
|
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222 | Splitting a string of the form C<hostname:port> is a common |
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223 | problem. Unfortunately, just splitting on the colon makes it hard to |
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224 | specify IPv6 addresses and doesn't support the less common but well |
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225 | standardised C<[ip literal]> syntax. |
|
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226 | |
|
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227 | This function tries to do this job in a better way, it supports the |
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228 | following formats, where C<port> can be a numerical port number of a |
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229 | service name, or a C<name=port> string, and the C< port> and C<:port> |
|
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230 | parts are optional. Also, everywhere where an IP address is supported |
|
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231 | a hostname or unix domain socket address is also supported (see |
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232 | C<parse_unix>). |
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233 | |
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234 | hostname:port e.g. "www.linux.org", "www.x.de:443", "www.x.de:https=443" |
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235 | ipv4:port e.g. "198.182.196.56", "127.1:22" |
|
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236 | ipv6 e.g. "::1", "affe::1" |
|
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237 | [ipv4or6]:port e.g. "[::1]", "[10.0.1]:80" |
|
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238 | [ipv4or6] port e.g. "[127.0.0.1]", "[www.x.org] 17" |
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239 | ipv4or6 port e.g. "::1 443", "10.0.0.1 smtp" |
|
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240 | |
|
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241 | It also supports defaulting the service name in a simple way by using |
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242 | C<$default_service> if no service was detected. If neither a service was |
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243 | detected nor a default was specified, then this function returns the |
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244 | empty list. The same happens when a parse error was detected, such as a |
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245 | hostname with a colon in it (the function is rather conservative, though). |
|
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246 | |
|
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247 | Example: |
|
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248 | |
|
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249 | print join ",", parse_hostport "localhost:443"; |
|
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250 | # => "localhost,443" |
|
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251 | |
|
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252 | print join ",", parse_hostport "localhost", "https"; |
|
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253 | # => "localhost,https" |
|
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254 | |
|
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255 | print join ",", parse_hostport "[::1]"; |
|
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256 | # => "," (empty list) |
|
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257 | |
|
|
258 | =cut |
|
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259 | |
|
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260 | sub parse_hostport($;$) { |
|
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261 | my ($host, $port); |
|
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262 | |
|
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263 | for ("$_[0]") { # work on a copy, just in case, and also reset pos |
|
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264 | |
|
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265 | # parse host, special cases: "ipv6" or "ipv6 port" |
|
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266 | unless ( |
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267 | ($host) = /^\s* ([0-9a-fA-F:]*:[0-9a-fA-F:]*:[0-9a-fA-F\.:]*)/xgc |
|
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268 | and parse_ipv6 $host |
|
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269 | ) { |
|
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270 | /^\s*/xgc; |
|
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271 | |
|
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272 | if (/^ \[ ([^\[\]]+) \]/xgc) { |
|
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273 | $host = $1; |
|
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274 | } elsif (/^ ([^\[\]:\ ]+) /xgc) { |
|
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275 | $host = $1; |
|
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276 | } else { |
|
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277 | return; |
|
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278 | } |
|
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279 | } |
|
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280 | |
|
|
281 | # parse port |
|
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282 | if (/\G (?:\s+|:) ([^:[:space:]]+) \s*$/xgc) { |
|
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283 | $port = $1; |
|
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284 | } elsif (/\G\s*$/gc && length $_[1]) { |
|
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285 | $port = $_[1]; |
|
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286 | } else { |
|
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287 | return; |
|
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288 | } |
|
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289 | } |
|
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290 | |
|
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291 | # hostnames must not contain :'s |
|
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292 | return if $host =~ /:/ && !parse_ipv6 $host; |
|
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293 | |
|
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294 | ($host, $port) |
|
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295 | } |
|
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296 | |
|
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297 | =item $string = format_hostport $host, $port |
|
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298 | |
|
|
299 | Takes a host (in textual form) and a port and formats in unambigiously in |
|
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300 | a way that C<parse_hostport> can parse it again. C<$port> can be C<undef>. |
|
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301 | |
|
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302 | =cut |
|
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303 | |
|
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304 | sub format_hostport($;$) { |
|
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305 | my ($host, $port) = @_; |
|
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306 | |
|
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307 | $port = ":$port" if length $port; |
|
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308 | $host = "[$host]" if $host =~ /:/; |
|
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309 | |
|
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310 | "$host$port" |
|
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311 | } |
165 | |
312 | |
166 | =item $sa_family = address_family $ipn |
313 | =item $sa_family = address_family $ipn |
167 | |
314 | |
168 | Returns the address family/protocol-family (AF_xxx/PF_xxx, in one value :) |
315 | Returns the address family/protocol-family (AF_xxx/PF_xxx, in one value :) |
169 | of the given host address in network format. |
316 | of the given host address in network format. |
… | |
… | |
176 | : 16 == length $_[0] |
323 | : 16 == length $_[0] |
177 | ? AF_INET6 |
324 | ? AF_INET6 |
178 | : unpack "S", $_[0] |
325 | : unpack "S", $_[0] |
179 | } |
326 | } |
180 | |
327 | |
|
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328 | =item $text = format_ipv4 $ipn |
|
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329 | |
|
|
330 | Expects a four octet string representing a binary IPv4 address and returns |
|
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331 | its textual format. Rarely used, see C<format_address> for a nicer |
|
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332 | interface. |
|
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333 | |
|
|
334 | =item $text = format_ipv6 $ipn |
|
|
335 | |
|
|
336 | Expects a sixteen octet string representing a binary IPv6 address and |
|
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337 | returns its textual format. Rarely used, see C<format_address> for a |
|
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338 | nicer interface. |
|
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339 | |
181 | =item $text = format_address $ipn |
340 | =item $text = format_address $ipn |
182 | |
341 | |
183 | Covnvert a host address in network format (e.g. 4 octets for IPv4 or 16 |
342 | Covnvert a host address in network format (e.g. 4 octets for IPv4 or 16 |
184 | octets for IPv6) and convert it into textual form. |
343 | octets for IPv6) and convert it into textual form. |
185 | |
344 | |
… | |
… | |
188 | This function works similarly to C<inet_ntop AF_INET || AF_INET6, ...>, |
347 | This function works similarly to C<inet_ntop AF_INET || AF_INET6, ...>, |
189 | except it automatically detects the address type. |
348 | except it automatically detects the address type. |
190 | |
349 | |
191 | Returns C<undef> if it cannot detect the type. |
350 | Returns C<undef> if it cannot detect the type. |
192 | |
351 | |
193 | =cut |
352 | If the C<$ipn> is a mapped IPv4 in IPv6 address (:ffff::<ipv4>), then just |
|
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353 | the contained IPv4 address will be returned. If you do not want that, you |
|
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354 | have to call C<format_ipv6> manually. |
194 | |
355 | |
195 | sub format_address; |
356 | =item $text = AnyEvent::Socket::ntoa $ipn |
|
|
357 | |
|
|
358 | Same as format_address, but not exported (think C<inet_ntoa>). |
|
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359 | |
|
|
360 | =cut |
|
|
361 | |
|
|
362 | sub format_ipv4($) { |
|
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363 | join ".", unpack "C4", $_[0] |
|
|
364 | } |
|
|
365 | |
|
|
366 | sub format_ipv6($) { |
|
|
367 | if (v0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 eq $_[0]) { |
|
|
368 | return "::"; |
|
|
369 | } elsif (v0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1 eq $_[0]) { |
|
|
370 | return "::1"; |
|
|
371 | } elsif (v0.0.0.0.0.0.0.0.0.0.0.0 eq substr $_[0], 0, 12) { |
|
|
372 | # v4compatible |
|
|
373 | return "::" . format_ipv4 substr $_[0], 12; |
|
|
374 | } elsif (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) { |
|
|
375 | # v4mapped |
|
|
376 | return "::ffff:" . format_ipv4 substr $_[0], 12; |
|
|
377 | } elsif (v0.0.0.0.0.0.0.0.255.255.0.0 eq substr $_[0], 0, 12) { |
|
|
378 | # v4translated |
|
|
379 | return "::ffff:0:" . format_ipv4 substr $_[0], 12; |
|
|
380 | } else { |
|
|
381 | my $ip = sprintf "%x:%x:%x:%x:%x:%x:%x:%x", unpack "n8", $_[0]; |
|
|
382 | |
|
|
383 | # this is rather sucky, I admit |
|
|
384 | $ip =~ s/^0:(?:0:)*(0$)?/::/ |
|
|
385 | or $ip =~ s/(:0){7}$/::/ or $ip =~ s/(:0){7}/:/ |
|
|
386 | or $ip =~ s/(:0){6}$/::/ or $ip =~ s/(:0){6}/:/ |
|
|
387 | or $ip =~ s/(:0){5}$/::/ or $ip =~ s/(:0){5}/:/ |
|
|
388 | or $ip =~ s/(:0){4}$/::/ or $ip =~ s/(:0){4}/:/ |
|
|
389 | or $ip =~ s/(:0){3}$/::/ or $ip =~ s/(:0){3}/:/ |
|
|
390 | or $ip =~ s/(:0){2}$/::/ or $ip =~ s/(:0){2}/:/ |
|
|
391 | or $ip =~ s/(:0){1}$/::/ or $ip =~ s/(:0){1}/:/; |
|
|
392 | return $ip |
|
|
393 | } |
|
|
394 | } |
|
|
395 | |
196 | sub format_address($) { |
396 | sub format_address($) { |
197 | my $af = address_family $_[0]; |
397 | my $af = address_family $_[0]; |
198 | if ($af == AF_INET) { |
398 | if ($af == AF_INET) { |
199 | return join ".", unpack "C4", $_[0] |
399 | return &format_ipv4; |
200 | } elsif ($af == AF_INET6) { |
400 | } elsif ($af == AF_INET6) { |
201 | if (v0.0.0.0.0.0.0.0.0.0.0.0 eq substr $_[0], 0, 12) { |
|
|
202 | # v4compatible |
|
|
203 | return "::" . format_address substr $_[0], 12; |
|
|
204 | } elsif (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) { |
401 | return (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) |
205 | # v4mapped |
402 | ? format_ipv4 substr $_[0], 12 |
206 | return "::ffff:" . format_address substr $_[0], 12; |
403 | : &format_ipv6; |
207 | } elsif (v0.0.0.0.0.0.0.0.255.255.0.0 eq substr $_[0], 0, 12) { |
|
|
208 | # v4translated |
|
|
209 | return "::ffff:0:" . format_address substr $_[0], 12; |
|
|
210 | } else { |
|
|
211 | my $ip = sprintf "%x:%x:%x:%x:%x:%x:%x:%x", unpack "n8", $_[0]; |
|
|
212 | |
|
|
213 | $ip =~ s/^0:(?:0:)*(0$)?/::/ |
|
|
214 | or $ip =~ s/(:0)+$/::/ |
|
|
215 | or $ip =~ s/(:0)+/:/; |
|
|
216 | return $ip |
|
|
217 | } |
|
|
218 | } elsif ($af == AF_UNIX) { |
404 | } elsif ($af == AF_UNIX) { |
219 | return "unix/" |
405 | return "unix/" |
220 | } else { |
406 | } else { |
221 | return undef |
407 | return undef |
222 | } |
408 | } |
223 | } |
409 | } |
224 | |
410 | |
225 | *format_ip = \&format_address; |
411 | *ntoa = \&format_address; |
226 | |
412 | |
227 | =item inet_aton $name_or_address, $cb->(@addresses) |
413 | =item inet_aton $name_or_address, $cb->(@addresses) |
228 | |
414 | |
229 | Works similarly to its Socket counterpart, except that it uses a |
415 | Works similarly to its Socket counterpart, except that it uses a |
230 | callback. Also, if a host has only an IPv6 address, this might be passed |
416 | callback. Also, if a host has only an IPv6 address, this might be passed |
… | |
… | |
258 | } |
444 | } |
259 | }); |
445 | }); |
260 | } |
446 | } |
261 | } |
447 | } |
262 | |
448 | |
|
|
449 | BEGIN { |
|
|
450 | *sockaddr_family = $Socket::VERSION >= 1.75 |
|
|
451 | ? \&Socket::sockaddr_family |
|
|
452 | : # for 5.6.x, we need to do something much more horrible |
|
|
453 | (Socket::pack_sockaddr_in 0x5555, "\x55\x55\x55\x55" |
|
|
454 | | eval { Socket::pack_sockaddr_un "U" }) =~ /^\x00/ |
|
|
455 | ? sub { unpack "xC", $_[0] } |
|
|
456 | : sub { unpack "S" , $_[0] }; |
|
|
457 | } |
|
|
458 | |
263 | # check for broken platforms with extra field in sockaddr structure |
459 | # check for broken platforms with extra field in sockaddr structure |
264 | # kind of a rfc vs. bsd issue, as usual (ok, normally it's a |
460 | # kind of a rfc vs. bsd issue, as usual (ok, normally it's a |
265 | # unix vs. bsd issue, a iso C vs. bsd issue or simply a |
461 | # unix vs. bsd issue, a iso C vs. bsd issue or simply a |
266 | # correctness vs. bsd issue. |
462 | # correctness vs. bsd issue.) |
267 | my $pack_family = 0x55 == Socket::sockaddr_family "\x55\x55" |
463 | my $pack_family = 0x55 == sockaddr_family ("\x55\x55") |
268 | ? "xC" : "S"; |
464 | ? "xC" : "S"; |
269 | |
465 | |
270 | =item $sa = AnyEvent::Socket::pack_sockaddr $service, $host |
466 | =item $sa = AnyEvent::Socket::pack_sockaddr $service, $host |
271 | |
467 | |
272 | Pack the given port/host combination into a binary sockaddr |
468 | Pack the given port/host combination into a binary sockaddr |
… | |
… | |
307 | is a special token that is understood by the other functions in this |
503 | is a special token that is understood by the other functions in this |
308 | module (C<format_address> converts it to C<unix/>). |
504 | module (C<format_address> converts it to C<unix/>). |
309 | |
505 | |
310 | =cut |
506 | =cut |
311 | |
507 | |
|
|
508 | # perl contains a bug (imho) where it requires that the kernel always returns |
|
|
509 | # sockaddr_un structures of maximum length (which is not, AFAICS, required |
|
|
510 | # by any standard). try to 0-pad structures for the benefit of those platforms. |
|
|
511 | |
|
|
512 | my $sa_un_zero = eval { Socket::pack_sockaddr_un "" }; $sa_un_zero ^= $sa_un_zero; |
|
|
513 | |
312 | sub unpack_sockaddr($) { |
514 | sub unpack_sockaddr($) { |
313 | my $af = Socket::sockaddr_family $_[0]; |
515 | my $af = sockaddr_family $_[0]; |
314 | |
516 | |
315 | if ($af == AF_INET) { |
517 | if ($af == AF_INET) { |
316 | Socket::unpack_sockaddr_in $_[0] |
518 | Socket::unpack_sockaddr_in $_[0] |
317 | } elsif ($af == AF_INET6) { |
519 | } elsif ($af == AF_INET6) { |
318 | unpack "x2 n x4 a16", $_[0] |
520 | unpack "x2 n x4 a16", $_[0] |
319 | } elsif ($af == AF_UNIX) { |
521 | } elsif ($af == AF_UNIX) { |
320 | ((Socket::unpack_sockaddr_un $_[0]), pack "S", AF_UNIX) |
522 | ((Socket::unpack_sockaddr_un $_[0] ^ $sa_un_zero), pack "S", AF_UNIX) |
321 | } else { |
523 | } else { |
322 | Carp::croak "unpack_sockaddr: unsupported protocol family $af"; |
524 | Carp::croak "unpack_sockaddr: unsupported protocol family $af"; |
323 | } |
525 | } |
324 | } |
526 | } |
325 | |
527 | |
… | |
… | |
346 | C<sctp>. The default is currently C<tcp>, but in the future, this function |
548 | C<sctp>. The default is currently C<tcp>, but in the future, this function |
347 | might try to use other protocols such as C<sctp>, depending on the socket |
549 | might try to use other protocols such as C<sctp>, depending on the socket |
348 | type and any SRV records it might find. |
550 | type and any SRV records it might find. |
349 | |
551 | |
350 | C<$family> must be either C<0> (meaning any protocol is OK), C<4> (use |
552 | C<$family> must be either C<0> (meaning any protocol is OK), C<4> (use |
351 | only IPv4) or C<6> (use only IPv6). This setting might be influenced by |
553 | only IPv4) or C<6> (use only IPv6). The default is influenced by |
352 | C<$ENV{PERL_ANYEVENT_PROTOCOLS}>. |
554 | C<$ENV{PERL_ANYEVENT_PROTOCOLS}>. |
353 | |
555 | |
354 | C<$type> must be C<SOCK_STREAM>, C<SOCK_DGRAM> or C<SOCK_SEQPACKET> (or |
556 | C<$type> must be C<SOCK_STREAM>, C<SOCK_DGRAM> or C<SOCK_SEQPACKET> (or |
355 | C<undef> in which case it gets automatically chosen). |
557 | C<undef> in which case it gets automatically chosen to be C<SOCK_STREAM> |
|
|
558 | unless C<$proto> is C<udp>). |
356 | |
559 | |
357 | The callback will receive zero or more array references that contain |
560 | The callback will receive zero or more array references that contain |
358 | C<$family, $type, $proto> for use in C<socket> and a binary |
561 | C<$family, $type, $proto> for use in C<socket> and a binary |
359 | C<$sockaddr> for use in C<connect> (or C<bind>). |
562 | C<$sockaddr> for use in C<connect> (or C<bind>). |
360 | |
563 | |
… | |
… | |
368 | |
571 | |
369 | sub resolve_sockaddr($$$$$$) { |
572 | sub resolve_sockaddr($$$$$$) { |
370 | my ($node, $service, $proto, $family, $type, $cb) = @_; |
573 | my ($node, $service, $proto, $family, $type, $cb) = @_; |
371 | |
574 | |
372 | if ($node eq "unix/") { |
575 | if ($node eq "unix/") { |
373 | return $cb->() if $family || !/^\//; # no can do |
576 | return $cb->() if $family || $service !~ /^\//; # no can do |
374 | |
577 | |
375 | return $cb->([AF_UNIX, $type, 0, Socket::pack_sockaddr_un $service]); |
578 | return $cb->([AF_UNIX, defined $type ? $type : SOCK_STREAM, 0, Socket::pack_sockaddr_un $service]); |
376 | } |
579 | } |
377 | |
580 | |
378 | unless (AF_INET6) { |
581 | unless (AF_INET6) { |
379 | $family != 6 |
582 | $family != 6 |
380 | or return $cb->(); |
583 | or return $cb->(); |
… | |
… | |
389 | $family ||= 6 unless $AnyEvent::PROTOCOL{ipv4}; |
592 | $family ||= 6 unless $AnyEvent::PROTOCOL{ipv4}; |
390 | |
593 | |
391 | $proto ||= "tcp"; |
594 | $proto ||= "tcp"; |
392 | $type ||= $proto eq "udp" ? SOCK_DGRAM : SOCK_STREAM; |
595 | $type ||= $proto eq "udp" ? SOCK_DGRAM : SOCK_STREAM; |
393 | |
596 | |
394 | my $proton = (getprotobyname $proto)[2] |
597 | my $proton = getprotobyname $proto |
395 | or Carp::croak "$proto: protocol unknown"; |
598 | or Carp::croak "$proto: protocol unknown"; |
396 | |
599 | |
397 | my $port; |
600 | my $port; |
398 | |
601 | |
399 | if ($service =~ /^(\S+)=(\d+)$/) { |
602 | if ($service =~ /^(\S+)=(\d+)$/) { |
… | |
… | |
408 | my @target = [$node, $port]; |
611 | my @target = [$node, $port]; |
409 | |
612 | |
410 | # resolve a records / provide sockaddr structures |
613 | # resolve a records / provide sockaddr structures |
411 | my $resolve = sub { |
614 | my $resolve = sub { |
412 | my @res; |
615 | my @res; |
413 | my $cv = AnyEvent->condvar (cb => sub { |
616 | my $cv = AE::cv { |
414 | $cb->( |
617 | $cb->( |
415 | map $_->[2], |
618 | map $_->[2], |
416 | sort { |
619 | sort { |
417 | $AnyEvent::PROTOCOL{$b->[1]} <=> $AnyEvent::PROTOCOL{$a->[1]} |
620 | $AnyEvent::PROTOCOL{$b->[1]} <=> $AnyEvent::PROTOCOL{$a->[1]} |
418 | or $a->[0] <=> $b->[0] |
621 | or $a->[0] <=> $b->[0] |
419 | } |
622 | } |
420 | @res |
623 | @res |
421 | ) |
624 | ) |
422 | }); |
625 | }; |
423 | |
626 | |
424 | $cv->begin; |
627 | $cv->begin; |
425 | for my $idx (0 .. $#target) { |
628 | for my $idx (0 .. $#target) { |
426 | my ($node, $port) = @{ $target[$idx] }; |
629 | my ($node, $port) = @{ $target[$idx] }; |
427 | |
630 | |
428 | if (my $noden = parse_address $node) { |
631 | if (my $noden = parse_address $node) { |
|
|
632 | my $af = address_family $noden; |
|
|
633 | |
429 | if (4 == length $noden && $family != 6) { |
634 | if ($af == AF_INET && $family != 6) { |
430 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
635 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
431 | pack_sockaddr $port, $noden]] |
636 | pack_sockaddr $port, $noden]] |
432 | } |
637 | } |
433 | |
638 | |
434 | if (16 == length $noden && $family != 4) { |
639 | if ($af == AF_INET6 && $family != 4) { |
435 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
640 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
436 | pack_sockaddr $port, $noden]] |
641 | pack_sockaddr $port, $noden]] |
437 | } |
642 | } |
438 | } else { |
643 | } else { |
439 | # ipv4 |
644 | # ipv4 |
440 | if ($family != 6) { |
645 | if ($family != 6) { |
441 | $cv->begin; |
646 | $cv->begin; |
442 | a $node, sub { |
647 | AnyEvent::DNS::a $node, sub { |
443 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
648 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
444 | pack_sockaddr $port, parse_ipv4 $_]] |
649 | pack_sockaddr $port, parse_ipv4 $_]] |
445 | for @_; |
650 | for @_; |
446 | $cv->end; |
651 | $cv->end; |
447 | }; |
652 | }; |
448 | } |
653 | } |
449 | |
654 | |
450 | # ipv6 |
655 | # ipv6 |
451 | if ($family != 4) { |
656 | if ($family != 4) { |
452 | $cv->begin; |
657 | $cv->begin; |
453 | aaaa $node, sub { |
658 | AnyEvent::DNS::aaaa $node, sub { |
454 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
659 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
455 | pack_sockaddr $port, parse_ipv6 $_]] |
660 | pack_sockaddr $port, parse_ipv6 $_]] |
456 | for @_; |
661 | for @_; |
457 | $cv->end; |
662 | $cv->end; |
458 | }; |
663 | }; |
… | |
… | |
465 | # try srv records, if applicable |
670 | # try srv records, if applicable |
466 | if ($node eq "localhost") { |
671 | if ($node eq "localhost") { |
467 | @target = (["127.0.0.1", $port], ["::1", $port]); |
672 | @target = (["127.0.0.1", $port], ["::1", $port]); |
468 | &$resolve; |
673 | &$resolve; |
469 | } elsif (defined $service && !parse_address $node) { |
674 | } elsif (defined $service && !parse_address $node) { |
470 | srv $service, $proto, $node, sub { |
675 | AnyEvent::DNS::srv $service, $proto, $node, sub { |
471 | my (@srv) = @_; |
676 | my (@srv) = @_; |
472 | |
677 | |
473 | # no srv records, continue traditionally |
678 | # no srv records, continue traditionally |
474 | @srv |
679 | @srv |
475 | or return &$resolve; |
680 | or return &$resolve; |
476 | |
681 | |
477 | # only srv record has "." => abort |
682 | # the only srv record has "." ("" here) => abort |
478 | $srv[0][2] ne "." || $#srv |
683 | $srv[0][2] ne "" || $#srv |
479 | or return $cb->(); |
684 | or return $cb->(); |
480 | |
685 | |
481 | # use srv records then |
686 | # use srv records then |
482 | @target = map ["$_->[3].", $_->[2]], |
687 | @target = map ["$_->[3].", $_->[2]], |
483 | grep $_->[3] ne ".", |
688 | grep $_->[3] ne ".", |
… | |
… | |
504 | |
709 | |
505 | In either case, it will create a list of target hosts (e.g. for multihomed |
710 | In either case, it will create a list of target hosts (e.g. for multihomed |
506 | hosts or hosts with both IPv4 and IPv6 addresses) and try to connect to |
711 | hosts or hosts with both IPv4 and IPv6 addresses) and try to connect to |
507 | each in turn. |
712 | each in turn. |
508 | |
713 | |
509 | If the connect is successful, then the C<$connect_cb> will be invoked with |
714 | After the connection is established, then the C<$connect_cb> will be |
510 | the socket file handle (in non-blocking mode) as first and the peer host |
715 | invoked with the socket file handle (in non-blocking mode) as first and |
511 | (as a textual IP address) and peer port as second and third arguments, |
716 | the peer host (as a textual IP address) and peer port as second and third |
512 | respectively. The fourth argument is a code reference that you can call |
717 | arguments, respectively. The fourth argument is a code reference that you |
513 | if, for some reason, you don't like this connection, which will cause |
718 | can call if, for some reason, you don't like this connection, which will |
514 | C<tcp_connect> to try the next one (or call your callback without any |
719 | cause C<tcp_connect> to try the next one (or call your callback without |
515 | arguments if there are no more connections). In most cases, you can simply |
720 | any arguments if there are no more connections). In most cases, you can |
516 | ignore this argument. |
721 | simply ignore this argument. |
517 | |
722 | |
518 | $cb->($filehandle, $host, $port, $retry) |
723 | $cb->($filehandle, $host, $port, $retry) |
519 | |
724 | |
520 | If the connect is unsuccessful, then the C<$connect_cb> will be invoked |
725 | If the connect is unsuccessful, then the C<$connect_cb> will be invoked |
521 | without any arguments and C<$!> will be set appropriately (with C<ENXIO> |
726 | without any arguments and C<$!> will be set appropriately (with C<ENXIO> |
522 | indicating a DNS resolution failure). |
727 | indicating a DNS resolution failure). |
|
|
728 | |
|
|
729 | The callback will I<never> be invoked before C<tcp_connect> returns, even |
|
|
730 | if C<tcp_connect> was able to connect immediately (e.g. on unix domain |
|
|
731 | sockets). |
523 | |
732 | |
524 | The file handle is perfect for being plugged into L<AnyEvent::Handle>, but |
733 | The file handle is perfect for being plugged into L<AnyEvent::Handle>, but |
525 | can be used as a normal perl file handle as well. |
734 | can be used as a normal perl file handle as well. |
526 | |
735 | |
527 | Unless called in void context, C<tcp_connect> returns a guard object that |
736 | Unless called in void context, C<tcp_connect> returns a guard object that |
… | |
… | |
548 | lessen the impact of this windows bug, a default timeout of 30 seconds |
757 | lessen the impact of this windows bug, a default timeout of 30 seconds |
549 | will be imposed on windows. Cygwin is not affected. |
758 | will be imposed on windows. Cygwin is not affected. |
550 | |
759 | |
551 | Simple Example: connect to localhost on port 22. |
760 | Simple Example: connect to localhost on port 22. |
552 | |
761 | |
553 | tcp_connect localhost => 22, sub { |
762 | tcp_connect localhost => 22, sub { |
554 | my $fh = shift |
763 | my $fh = shift |
555 | or die "unable to connect: $!"; |
764 | or die "unable to connect: $!"; |
556 | # do something |
765 | # do something |
557 | }; |
766 | }; |
558 | |
767 | |
559 | Complex Example: connect to www.google.com on port 80 and make a simple |
768 | Complex Example: connect to www.google.com on port 80 and make a simple |
560 | GET request without much error handling. Also limit the connection timeout |
769 | GET request without much error handling. Also limit the connection timeout |
561 | to 15 seconds. |
770 | to 15 seconds. |
562 | |
771 | |
… | |
… | |
566 | or die "unable to connect: $!"; |
775 | or die "unable to connect: $!"; |
567 | |
776 | |
568 | my $handle; # avoid direct assignment so on_eof has it in scope. |
777 | my $handle; # avoid direct assignment so on_eof has it in scope. |
569 | $handle = new AnyEvent::Handle |
778 | $handle = new AnyEvent::Handle |
570 | fh => $fh, |
779 | fh => $fh, |
|
|
780 | on_error => sub { |
|
|
781 | warn "error $_[2]\n"; |
|
|
782 | $_[0]->destroy; |
|
|
783 | }, |
571 | on_eof => sub { |
784 | on_eof => sub { |
572 | undef $handle; # keep it alive till eof |
785 | $handle->destroy; # destroy handle |
573 | warn "done.\n"; |
786 | warn "done.\n"; |
574 | }; |
787 | }; |
575 | |
788 | |
576 | $handle->push_write ("GET / HTTP/1.0\015\012\015\012"); |
789 | $handle->push_write ("GET / HTTP/1.0\015\012\015\012"); |
577 | |
790 | |
578 | $handle->push_read_line ("\015\012\015\012", sub { |
791 | $handle->push_read (line => "\015\012\015\012", sub { |
579 | my ($handle, $line) = @_; |
792 | my ($handle, $line) = @_; |
580 | |
793 | |
581 | # print response header |
794 | # print response header |
582 | print "HEADER\n$line\n\nBODY\n"; |
795 | print "HEADER\n$line\n\nBODY\n"; |
583 | |
796 | |
… | |
… | |
609 | # also http://advogato.org/article/672.html |
822 | # also http://advogato.org/article/672.html |
610 | |
823 | |
611 | my %state = ( fh => undef ); |
824 | my %state = ( fh => undef ); |
612 | |
825 | |
613 | # name/service to type/sockaddr resolution |
826 | # name/service to type/sockaddr resolution |
614 | resolve_sockaddr $host, $port, 0, 0, 0, sub { |
827 | resolve_sockaddr $host, $port, 0, 0, undef, sub { |
615 | my @target = @_; |
828 | my @target = @_; |
616 | |
829 | |
617 | $state{next} = sub { |
830 | $state{next} = sub { |
618 | return unless exists $state{fh}; |
831 | return unless exists $state{fh}; |
619 | |
832 | |
620 | my $target = shift @target |
833 | my $target = shift @target |
621 | or do { |
834 | or return (%state = (), _postpone $connect); |
622 | %state = (); |
|
|
623 | return $connect->(); |
|
|
624 | }; |
|
|
625 | |
835 | |
626 | my ($domain, $type, $proto, $sockaddr) = @$target; |
836 | my ($domain, $type, $proto, $sockaddr) = @$target; |
627 | |
837 | |
628 | # socket creation |
838 | # socket creation |
629 | socket $state{fh}, $domain, $type, $proto |
839 | socket $state{fh}, $domain, $type, $proto |
… | |
… | |
633 | |
843 | |
634 | my $timeout = $prepare && $prepare->($state{fh}); |
844 | my $timeout = $prepare && $prepare->($state{fh}); |
635 | |
845 | |
636 | $timeout ||= 30 if AnyEvent::WIN32; |
846 | $timeout ||= 30 if AnyEvent::WIN32; |
637 | |
847 | |
638 | $state{to} = AnyEvent->timer (after => $timeout, cb => sub { |
848 | $state{to} = AE::timer $timeout, 0, sub { |
639 | $! = &Errno::ETIMEDOUT; |
849 | $! = Errno::ETIMEDOUT; |
640 | $state{next}(); |
850 | $state{next}(); |
641 | }) if $timeout; |
851 | } if $timeout; |
642 | |
852 | |
643 | # called when the connect was successful, which, |
853 | # now connect |
644 | # in theory, could be the case immediately (but never is in practise) |
854 | if ( |
645 | my $connected = sub { |
855 | (connect $state{fh}, $sockaddr) |
646 | delete $state{ww}; |
856 | || ($! == Errno::EINPROGRESS # POSIX |
647 | delete $state{to}; |
857 | || $! == Errno::EWOULDBLOCK |
648 | |
858 | # WSAEINPROGRESS intentionally not checked - it means something else entirely |
|
|
859 | || $! == AnyEvent::Util::WSAEINVAL # not convinced, but doesn't hurt |
|
|
860 | || $! == AnyEvent::Util::WSAEWOULDBLOCK) |
|
|
861 | ) { |
|
|
862 | $state{ww} = AE::io $state{fh}, 1, sub { |
649 | # we are connected, or maybe there was an error |
863 | # we are connected, or maybe there was an error |
650 | if (my $sin = getpeername $state{fh}) { |
864 | if (my $sin = getpeername $state{fh}) { |
651 | my ($port, $host) = unpack_sockaddr $sin; |
865 | my ($port, $host) = unpack_sockaddr $sin; |
652 | |
866 | |
|
|
867 | delete $state{ww}; delete $state{to}; |
|
|
868 | |
653 | my $guard = guard { |
869 | my $guard = guard { %state = () }; |
654 | %state = (); |
|
|
655 | }; |
|
|
656 | |
870 | |
657 | $connect->($state{fh}, format_address $host, $port, sub { |
871 | $connect->(delete $state{fh}, format_address $host, $port, sub { |
658 | $guard->cancel; |
872 | $guard->cancel; |
|
|
873 | $state{next}(); |
|
|
874 | }); |
|
|
875 | } else { |
|
|
876 | # dummy read to fetch real error code |
|
|
877 | sysread $state{fh}, my $buf, 1 if $! == Errno::ENOTCONN; |
|
|
878 | |
|
|
879 | return if $! == Errno::EAGAIN; # skip spurious wake-ups |
|
|
880 | |
|
|
881 | delete $state{ww}; delete $state{to}; |
|
|
882 | |
659 | $state{next}(); |
883 | $state{next}(); |
660 | }); |
884 | } |
661 | } else { |
|
|
662 | # dummy read to fetch real error code |
|
|
663 | sysread $state{fh}, my $buf, 1 if $! == &Errno::ENOTCONN; |
|
|
664 | $state{next}(); |
|
|
665 | } |
885 | }; |
666 | }; |
|
|
667 | |
|
|
668 | # now connect |
|
|
669 | if (connect $state{fh}, $sockaddr) { |
|
|
670 | $connected->(); |
|
|
671 | } elsif ($! == &Errno::EINPROGRESS # POSIX |
|
|
672 | || $! == &Errno::EWOULDBLOCK |
|
|
673 | # WSAEINPROGRESS intentionally not checked - it means something else entirely |
|
|
674 | || $! == AnyEvent::Util::WSAEINVAL # not convinced, but doesn't hurt |
|
|
675 | || $! == AnyEvent::Util::WSAEWOULDBLOCK) { |
|
|
676 | $state{ww} = AnyEvent->io (fh => $state{fh}, poll => 'w', cb => $connected); |
|
|
677 | } else { |
886 | } else { |
678 | $state{next}(); |
887 | $state{next}(); |
679 | } |
888 | } |
680 | }; |
889 | }; |
681 | |
890 | |
682 | $! = &Errno::ENXIO; |
891 | $! = Errno::ENXIO; |
683 | $state{next}(); |
892 | $state{next}(); |
684 | }; |
893 | }; |
685 | |
894 | |
686 | defined wantarray && guard { %state = () } |
895 | defined wantarray && guard { %state = () } |
687 | } |
896 | } |
… | |
… | |
691 | Create and bind a stream socket to the given host, and port, set the |
900 | Create and bind a stream socket to the given host, and port, set the |
692 | SO_REUSEADDR flag (if applicable) and call C<listen>. Unlike the name |
901 | SO_REUSEADDR flag (if applicable) and call C<listen>. Unlike the name |
693 | implies, this function can also bind on UNIX domain sockets. |
902 | implies, this function can also bind on UNIX domain sockets. |
694 | |
903 | |
695 | For internet sockets, C<$host> must be an IPv4 or IPv6 address (or |
904 | For internet sockets, C<$host> must be an IPv4 or IPv6 address (or |
696 | C<undef>, in which case it binds either to C<0> or to C<::>, depending on |
905 | C<undef>, in which case it binds either to C<0> or to C<::>, depending |
697 | whether IPv4 or IPv6 is the preferred protocol). |
906 | on whether IPv4 or IPv6 is the preferred protocol, and maybe to both in |
|
|
907 | future versions, as applicable). |
698 | |
908 | |
699 | To bind to the IPv4 wildcard address, use C<0>, to bind to the IPv6 |
909 | To bind to the IPv4 wildcard address, use C<0>, to bind to the IPv6 |
700 | wildcard address, use C<::>. |
910 | wildcard address, use C<::>. |
701 | |
911 | |
702 | The port is specified by C<$service>, which must be either a service name or |
912 | The port is specified by C<$service>, which must be either a service name or |
… | |
… | |
726 | address and port number of the local socket endpoint as second and third |
936 | address and port number of the local socket endpoint as second and third |
727 | arguments. |
937 | arguments. |
728 | |
938 | |
729 | It should return the length of the listen queue (or C<0> for the default). |
939 | It should return the length of the listen queue (or C<0> for the default). |
730 | |
940 | |
|
|
941 | Note to IPv6 users: RFC-compliant behaviour for IPv6 sockets listening on |
|
|
942 | C<::> is to bind to both IPv6 and IPv4 addresses by default on dual-stack |
|
|
943 | hosts. Unfortunately, only GNU/Linux seems to implement this properly, so |
|
|
944 | if you want both IPv4 and IPv6 listening sockets you should create the |
|
|
945 | IPv6 socket first and then attempt to bind on the IPv4 socket, but ignore |
|
|
946 | any C<EADDRINUSE> errors. |
|
|
947 | |
731 | Example: bind on some TCP port on the local machine and tell each client |
948 | Example: bind on some TCP port on the local machine and tell each client |
732 | to go away. |
949 | to go away. |
733 | |
950 | |
734 | tcp_server undef, undef, sub { |
951 | tcp_server undef, undef, sub { |
735 | my ($fh, $host, $port) = @_; |
952 | my ($fh, $host, $port) = @_; |
736 | |
953 | |
737 | syswrite $fh, "The internet is full, $host:$port. Go away!\015\012"; |
954 | syswrite $fh, "The internet is full, $host:$port. Go away!\015\012"; |
738 | }, sub { |
955 | }, sub { |
739 | my ($fh, $thishost, $thisport) = @_; |
956 | my ($fh, $thishost, $thisport) = @_; |
740 | warn "bound to $thishost, port $thisport\n"; |
957 | warn "bound to $thishost, port $thisport\n"; |
|
|
958 | }; |
|
|
959 | |
|
|
960 | Example: bind a server on a unix domain socket. |
|
|
961 | |
|
|
962 | tcp_server "unix/", "/tmp/mydir/mysocket", sub { |
|
|
963 | my ($fh) = @_; |
741 | }; |
964 | }; |
742 | |
965 | |
743 | =cut |
966 | =cut |
744 | |
967 | |
745 | sub tcp_server($$$;$) { |
968 | sub tcp_server($$$;$) { |
… | |
… | |
791 | $len ||= 128; |
1014 | $len ||= 128; |
792 | |
1015 | |
793 | listen $state{fh}, $len |
1016 | listen $state{fh}, $len |
794 | or Carp::croak "listen: $!"; |
1017 | or Carp::croak "listen: $!"; |
795 | |
1018 | |
796 | $state{aw} = AnyEvent->io (fh => $state{fh}, poll => 'r', cb => sub { |
1019 | $state{aw} = AE::io $state{fh}, 0, sub { |
797 | # this closure keeps $state alive |
1020 | # this closure keeps $state alive |
798 | while (my $peer = accept my $fh, $state{fh}) { |
1021 | while (my $peer = accept my $fh, $state{fh}) { |
799 | fh_nonblocking $fh, 1; # POSIX requires inheritance, the outside world does not |
1022 | fh_nonblocking $fh, 1; # POSIX requires inheritance, the outside world does not |
800 | |
1023 | |
801 | my ($service, $host) = unpack_sockaddr $peer; |
1024 | my ($service, $host) = unpack_sockaddr $peer; |
802 | $accept->($fh, format_address $host, $service); |
1025 | $accept->($fh, format_address $host, $service); |
803 | } |
1026 | } |
804 | }); |
1027 | }; |
805 | |
1028 | |
806 | defined wantarray |
1029 | defined wantarray |
807 | ? guard { %state = () } # clear fh and watcher, which breaks the circular dependency |
1030 | ? guard { %state = () } # clear fh and watcher, which breaks the circular dependency |
808 | : () |
1031 | : () |
809 | } |
1032 | } |
810 | |
1033 | |
811 | 1; |
1034 | 1; |
812 | |
1035 | |
813 | =back |
1036 | =back |
814 | |
1037 | |
|
|
1038 | =head1 SECURITY CONSIDERATIONS |
|
|
1039 | |
|
|
1040 | This module is quite powerful, with with power comes the ability to abuse |
|
|
1041 | as well: If you accept "hostnames" and ports from untrusted sources, |
|
|
1042 | then note that this can be abused to delete files (host=C<unix/>). This |
|
|
1043 | is not really a problem with this module, however, as blindly accepting |
|
|
1044 | any address and protocol and trying to bind a server or connect to it is |
|
|
1045 | harmful in general. |
|
|
1046 | |
815 | =head1 AUTHOR |
1047 | =head1 AUTHOR |
816 | |
1048 | |
817 | Marc Lehmann <schmorp@schmorp.de> |
1049 | Marc Lehmann <schmorp@schmorp.de> |
818 | http://home.schmorp.de/ |
1050 | http://home.schmorp.de/ |
819 | |
1051 | |