… | |
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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 |
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… | |
47 | use AnyEvent::DNS (); |
47 | use AnyEvent::DNS (); |
48 | |
48 | |
49 | use base 'Exporter'; |
49 | use base 'Exporter'; |
50 | |
50 | |
51 | our @EXPORT = qw( |
51 | our @EXPORT = qw( |
|
|
52 | parse_hostport |
52 | parse_ipv4 parse_ipv6 |
53 | parse_ipv4 parse_ipv6 |
53 | parse_ip parse_address |
54 | parse_ip parse_address |
54 | format_ip format_address |
55 | format_ip format_address |
55 | address_family |
56 | address_family |
56 | inet_aton |
57 | inet_aton |
57 | tcp_server |
58 | tcp_server |
58 | tcp_connect |
59 | tcp_connect |
59 | ); |
60 | ); |
60 | |
61 | |
61 | our $VERSION = '1.0'; |
62 | our $VERSION = 4.42; |
62 | |
63 | |
63 | =item $ipn = parse_ipv4 $dotted_quad |
64 | =item $ipn = parse_ipv4 $dotted_quad |
64 | |
65 | |
65 | 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 |
66 | 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 |
… | |
… | |
78 | |
79 | |
79 | # check leading parts against range |
80 | # check leading parts against range |
80 | return undef if grep $_ >= 256, @_[0 .. @_ - 2]; |
81 | return undef if grep $_ >= 256, @_[0 .. @_ - 2]; |
81 | |
82 | |
82 | # check trailing part against range |
83 | # check trailing part against range |
83 | return undef if $_[-1] >= 1 << (8 * (4 - $#_)); |
84 | return undef if $_[-1] >= 2 ** (8 * (4 - $#_)); |
84 | |
85 | |
85 | pack "N", (pop) |
86 | pack "N", (pop) |
86 | + ($_[0] << 24) |
87 | + ($_[0] << 24) |
87 | + ($_[1] << 16) |
88 | + ($_[1] << 16) |
88 | + ($_[2] << 8); |
89 | + ($_[2] << 8); |
… | |
… | |
143 | ? pack "S", AF_UNIX |
144 | ? pack "S", AF_UNIX |
144 | : undef |
145 | : undef |
145 | |
146 | |
146 | } |
147 | } |
147 | |
148 | |
148 | =item $ipn = parse_address $text |
149 | =item $ipn = parse_address $ip |
149 | |
150 | |
150 | Combines C<parse_ipv4> and C<parse_ipv6> in one function. The address |
151 | Combines C<parse_ipv4> and C<parse_ipv6> in one function. The address |
151 | here refers to the host address (not socket address) in network form |
152 | here refers to the host address (not socket address) in network form |
152 | (binary). |
153 | (binary). |
153 | |
154 | |
154 | If the C<$text> is C<unix/>, then this function returns a special token |
155 | If the C<$text> is C<unix/>, then this function returns a special token |
155 | recognised by the other functions in this module to mean "UNIX domain |
156 | recognised by the other functions in this module to mean "UNIX domain |
156 | socket". |
157 | socket". |
157 | |
158 | |
|
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159 | If the C<$text> to parse is a mapped IPv4 in IPv6 address (:ffff::<ipv4>), |
|
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160 | then it will be treated as an IPv4 address. If you don't want that, you |
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161 | have to call C<parse_ipv4> and/or C<parse_ipv6> manually. |
|
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162 | |
|
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163 | =item $ipn = AnyEvent::Socket::aton $ip |
|
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164 | |
|
|
165 | Same as C<parse_address>, but not exported (think C<Socket::inet_aton> but |
|
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166 | I<without> name resolution). |
|
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167 | |
158 | =cut |
168 | =cut |
159 | |
169 | |
160 | sub parse_address($) { |
170 | sub parse_address($) { |
161 | &parse_ipv4 || &parse_ipv6 || &parse_unix |
171 | for (&parse_ipv6) { |
|
|
172 | if ($_) { |
|
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173 | s/^\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff//; |
|
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174 | return $_; |
|
|
175 | } else { |
|
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176 | return &parse_ipv4 || &parse_unix |
|
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177 | } |
|
|
178 | } |
162 | } |
179 | } |
163 | |
180 | |
164 | *parse_ip =\&parse_address; #d# |
181 | *aton = \&parse_address; |
|
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182 | |
|
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183 | =item ($host, $service) = parse_hostport $string[, $default_service] |
|
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184 | |
|
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185 | Splitting a string of the form C<hostname:port> is a common |
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186 | problem. Unfortunately, just splitting on the colon makes it hard to |
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187 | specify IPv6 addresses and doesn't support the less common but well |
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188 | standardised C<[ip literal]> syntax. |
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189 | |
|
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190 | This function tries to do this job in a better way, it supports the |
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191 | following formats, where C<port> can be a numerical port number of a |
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192 | service name, or a C<name=port> string, and the C< port> and C<:port> |
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193 | parts are optional. Also, everywhere where an IP address is supported |
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194 | a hostname or unix domain socket address is also supported (see |
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195 | C<parse_unix>). |
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196 | |
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197 | hostname:port e.g. "www.linux.org", "www.x.de:443", "www.x.de:https=443" |
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198 | ipv4:port e.g. "198.182.196.56", "127.1:22" |
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199 | ipv6 e.g. "::1", "affe::1" |
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200 | [ipv4or6]:port e.g. "[::1]", "[10.0.1]:80" |
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201 | [ipv4or6] port e.g. "[127.0.0.1]", "[www.x.org] 17" |
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202 | ipv4or6 port e.g. "::1 443", "10.0.0.1 smtp" |
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203 | |
|
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204 | It also supports defaulting the service name in a simple way by using |
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205 | C<$default_service> if no service was detected. If neither a service was |
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206 | detected nor a default was specified, then this function returns the |
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207 | empty list. The same happens when a parse error weas detected, such as a |
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208 | hostname with a colon in it (the function is rather conservative, though). |
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209 | |
|
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210 | Example: |
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211 | |
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212 | print join ",", parse_hostport "localhost:443"; |
|
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213 | # => "localhost,443" |
|
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214 | |
|
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215 | print join ",", parse_hostport "localhost", "https"; |
|
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216 | # => "localhost,https" |
|
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217 | |
|
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218 | print join ",", parse_hostport "[::1]"; |
|
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219 | # => "," (empty list) |
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220 | |
|
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221 | =cut |
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222 | |
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223 | sub parse_hostport($;$) { |
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224 | my ($host, $port); |
|
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225 | |
|
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226 | for ("$_[0]") { # work on a copy, just in case, and also reset pos |
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227 | |
|
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228 | # parse host, special cases: "ipv6" or "ipv6 port" |
|
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229 | unless ( |
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230 | ($host) = /^\s* ([0-9a-fA-F:]*:[0-9a-fA-F:]*:[0-9a-fA-F\.:]*)/xgc |
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231 | and parse_ipv6 $host |
|
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232 | ) { |
|
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233 | /^\s*/xgc; |
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234 | |
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235 | if (/^ \[ ([^\[\]]+) \]/xgc) { |
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236 | $host = $1; |
|
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237 | } elsif (/^ ([^\[\]:\ ]+) /xgc) { |
|
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238 | $host = $1; |
|
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239 | } else { |
|
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240 | return; |
|
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241 | } |
|
|
242 | } |
|
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243 | |
|
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244 | # parse port |
|
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245 | if (/\G (?:\s+|:) ([^:[:space:]]+) \s*$/xgc) { |
|
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246 | $port = $1; |
|
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247 | } elsif (/\G\s*$/gc && length $_[1]) { |
|
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248 | $port = $_[1]; |
|
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249 | } else { |
|
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250 | return; |
|
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251 | } |
|
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252 | } |
|
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253 | |
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254 | # hostnames must not contain :'s |
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255 | return if $host =~ /:/ && !parse_ipv6 $host; |
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256 | |
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257 | ($host, $port) |
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258 | } |
165 | |
259 | |
166 | =item $sa_family = address_family $ipn |
260 | =item $sa_family = address_family $ipn |
167 | |
261 | |
168 | Returns the address family/protocol-family (AF_xxx/PF_xxx, in one value :) |
262 | Returns the address family/protocol-family (AF_xxx/PF_xxx, in one value :) |
169 | of the given host address in network format. |
263 | of the given host address in network format. |
… | |
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176 | : 16 == length $_[0] |
270 | : 16 == length $_[0] |
177 | ? AF_INET6 |
271 | ? AF_INET6 |
178 | : unpack "S", $_[0] |
272 | : unpack "S", $_[0] |
179 | } |
273 | } |
180 | |
274 | |
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275 | =item $text = format_ipv4 $ipn |
|
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276 | |
|
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277 | Expects a four octet string representing a binary IPv4 address and returns |
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278 | its textual format. Rarely used, see C<format_address> for a nicer |
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279 | interface. |
|
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280 | |
|
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281 | =item $text = format_ipv6 $ipn |
|
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282 | |
|
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283 | Expects a sixteen octet string representing a binary IPv6 address and |
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284 | returns its textual format. Rarely used, see C<format_address> for a |
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285 | nicer interface. |
|
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286 | |
181 | =item $text = format_address $ipn |
287 | =item $text = format_address $ipn |
182 | |
288 | |
183 | Covnvert a host address in network format (e.g. 4 octets for IPv4 or 16 |
289 | Covnvert a host address in network format (e.g. 4 octets for IPv4 or 16 |
184 | octets for IPv6) and convert it into textual form. |
290 | octets for IPv6) and convert it into textual form. |
185 | |
291 | |
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188 | This function works similarly to C<inet_ntop AF_INET || AF_INET6, ...>, |
294 | This function works similarly to C<inet_ntop AF_INET || AF_INET6, ...>, |
189 | except it automatically detects the address type. |
295 | except it automatically detects the address type. |
190 | |
296 | |
191 | Returns C<undef> if it cannot detect the type. |
297 | Returns C<undef> if it cannot detect the type. |
192 | |
298 | |
193 | =cut |
299 | If the C<$ipn> is a mapped IPv4 in IPv6 address (:ffff::<ipv4>), then just |
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300 | the contained IPv4 address will be returned. If you do not want that, you |
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301 | have to call C<format_ipv6> manually. |
194 | |
302 | |
195 | sub format_address; |
303 | =item $text = AnyEvent::Socket::ntoa $ipn |
|
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304 | |
|
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305 | Same as format_address, but not exported (think C<inet_ntoa>). |
|
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306 | |
|
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307 | =cut |
|
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308 | |
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309 | sub format_ipv4($) { |
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310 | join ".", unpack "C4", $_[0] |
|
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311 | } |
|
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312 | |
|
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313 | sub format_ipv6($) { |
|
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314 | if (v0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 eq $_[0]) { |
|
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315 | return "::"; |
|
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316 | } elsif (v0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1 eq $_[0]) { |
|
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317 | return "::1"; |
|
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318 | } elsif (v0.0.0.0.0.0.0.0.0.0.0.0 eq substr $_[0], 0, 12) { |
|
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319 | # v4compatible |
|
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320 | return "::" . format_ipv4 substr $_[0], 12; |
|
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321 | } elsif (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) { |
|
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322 | # v4mapped |
|
|
323 | return "::ffff:" . format_ipv4 substr $_[0], 12; |
|
|
324 | } elsif (v0.0.0.0.0.0.0.0.255.255.0.0 eq substr $_[0], 0, 12) { |
|
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325 | # v4translated |
|
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326 | return "::ffff:0:" . format_ipv4 substr $_[0], 12; |
|
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327 | } else { |
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328 | my $ip = sprintf "%x:%x:%x:%x:%x:%x:%x:%x", unpack "n8", $_[0]; |
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329 | |
|
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330 | # this is rather sucky, I admit |
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331 | $ip =~ s/^0:(?:0:)*(0$)?/::/ |
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332 | or $ip =~ s/(:0){7}$/::/ or $ip =~ s/(:0){7}/:/ |
|
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333 | or $ip =~ s/(:0){6}$/::/ or $ip =~ s/(:0){6}/:/ |
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334 | or $ip =~ s/(:0){5}$/::/ or $ip =~ s/(:0){5}/:/ |
|
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335 | or $ip =~ s/(:0){4}$/::/ or $ip =~ s/(:0){4}/:/ |
|
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336 | or $ip =~ s/(:0){3}$/::/ or $ip =~ s/(:0){3}/:/ |
|
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337 | or $ip =~ s/(:0){2}$/::/ or $ip =~ s/(:0){2}/:/ |
|
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338 | or $ip =~ s/(:0){1}$/::/ or $ip =~ s/(:0){1}/:/; |
|
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339 | return $ip |
|
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340 | } |
|
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341 | } |
|
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342 | |
196 | sub format_address($) { |
343 | sub format_address($) { |
197 | my $af = address_family $_[0]; |
344 | my $af = address_family $_[0]; |
198 | if ($af == AF_INET) { |
345 | if ($af == AF_INET) { |
199 | return join ".", unpack "C4", $_[0] |
346 | return &format_ipv4; |
200 | } elsif ($af == AF_INET6) { |
347 | } 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) { |
348 | return (v0.0.0.0.0.0.0.0.0.0.255.255 eq substr $_[0], 0, 12) |
205 | # v4mapped |
349 | ? format_ipv4 substr $_[0], 12 |
206 | return "::ffff:" . format_address substr $_[0], 12; |
350 | : &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 { |
|
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211 | my $ip = sprintf "%x:%x:%x:%x:%x:%x:%x:%x", unpack "n8", $_[0]; |
|
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212 | |
|
|
213 | $ip =~ s/^0:(?:0:)*(0$)?/::/ |
|
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214 | or $ip =~ s/(:0)+$/::/ |
|
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215 | or $ip =~ s/(:0)+/:/; |
|
|
216 | return $ip |
|
|
217 | } |
|
|
218 | } elsif ($af == AF_UNIX) { |
351 | } elsif ($af == AF_UNIX) { |
219 | return "unix/" |
352 | return "unix/" |
220 | } else { |
353 | } else { |
221 | return undef |
354 | return undef |
222 | } |
355 | } |
223 | } |
356 | } |
224 | |
357 | |
225 | *format_ip = \&format_address; |
358 | *ntoa = \&format_address; |
226 | |
359 | |
227 | =item inet_aton $name_or_address, $cb->(@addresses) |
360 | =item inet_aton $name_or_address, $cb->(@addresses) |
228 | |
361 | |
229 | Works similarly to its Socket counterpart, except that it uses a |
362 | 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 |
363 | callback. Also, if a host has only an IPv6 address, this might be passed |
… | |
… | |
262 | |
395 | |
263 | # check for broken platforms with extra field in sockaddr structure |
396 | # 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 |
397 | # 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 |
398 | # unix vs. bsd issue, a iso C vs. bsd issue or simply a |
266 | # correctness vs. bsd issue. |
399 | # correctness vs. bsd issue. |
267 | my $pack_family = 0x55 == Socket::sockaddr_family "\x55\x55" |
400 | my $pack_family = (0x55 == Socket::sockaddr_family "\x55\x55") |
268 | ? "xC" : "S"; |
401 | ? "xC" : "S"; |
269 | |
402 | |
270 | =item $sa = AnyEvent::Socket::pack_sockaddr $service, $host |
403 | =item $sa = AnyEvent::Socket::pack_sockaddr $service, $host |
271 | |
404 | |
272 | Pack the given port/host combination into a binary sockaddr |
405 | Pack the given port/host combination into a binary sockaddr |
… | |
… | |
346 | C<sctp>. The default is currently C<tcp>, but in the future, this function |
479 | C<sctp>. The default is currently C<tcp>, but in the future, this function |
347 | might try to use other protocols such as C<sctp>, depending on the socket |
480 | might try to use other protocols such as C<sctp>, depending on the socket |
348 | type and any SRV records it might find. |
481 | type and any SRV records it might find. |
349 | |
482 | |
350 | C<$family> must be either C<0> (meaning any protocol is OK), C<4> (use |
483 | C<$family> must be either C<0> (meaning any protocol is OK), C<4> (use |
351 | only IPv4) or C<6> (use only IPv6). This setting might be influenced by |
484 | only IPv4) or C<6> (use only IPv6). The default is influenced by |
352 | C<$ENV{PERL_ANYEVENT_PROTOCOLS}>. |
485 | C<$ENV{PERL_ANYEVENT_PROTOCOLS}>. |
353 | |
486 | |
354 | C<$type> must be C<SOCK_STREAM>, C<SOCK_DGRAM> or C<SOCK_SEQPACKET> (or |
487 | C<$type> must be C<SOCK_STREAM>, C<SOCK_DGRAM> or C<SOCK_SEQPACKET> (or |
355 | C<undef> in which case it gets automatically chosen). |
488 | C<undef> in which case it gets automatically chosen to be C<SOCK_STREAM> |
|
|
489 | unless C<$proto> is C<udp>). |
356 | |
490 | |
357 | The callback will receive zero or more array references that contain |
491 | The callback will receive zero or more array references that contain |
358 | C<$family, $type, $proto> for use in C<socket> and a binary |
492 | C<$family, $type, $proto> for use in C<socket> and a binary |
359 | C<$sockaddr> for use in C<connect> (or C<bind>). |
493 | C<$sockaddr> for use in C<connect> (or C<bind>). |
360 | |
494 | |
… | |
… | |
364 | |
498 | |
365 | resolve_sockaddr "google.com", "http", 0, undef, undef, sub { ... }; |
499 | resolve_sockaddr "google.com", "http", 0, undef, undef, sub { ... }; |
366 | |
500 | |
367 | =cut |
501 | =cut |
368 | |
502 | |
|
|
503 | # microsoft can't even get getprotobyname working (the etc/protocols file |
|
|
504 | # gets lost fairly often on windows), so we have to hardcode some common |
|
|
505 | # protocol numbers ourselves. |
|
|
506 | our %PROTO_BYNAME; |
|
|
507 | |
|
|
508 | $PROTO_BYNAME{tcp} = &Socket::IPPROTO_TCP if defined &Socket::IPPROTO_TCP; |
|
|
509 | $PROTO_BYNAME{udp} = &Socket::IPPROTO_UDP if defined &Socket::IPPROTO_UDP; |
|
|
510 | $PROTO_BYNAME{icmp} = &Socket::IPPROTO_ICMP if defined &Socket::IPPROTO_ICMP; |
|
|
511 | |
369 | sub resolve_sockaddr($$$$$$) { |
512 | sub resolve_sockaddr($$$$$$) { |
370 | my ($node, $service, $proto, $family, $type, $cb) = @_; |
513 | my ($node, $service, $proto, $family, $type, $cb) = @_; |
371 | |
514 | |
372 | if ($node eq "unix/") { |
515 | if ($node eq "unix/") { |
373 | return $cb->() if $family || !/^\//; # no can do |
516 | return $cb->() if $family || $service !~ /^\//; # no can do |
374 | |
517 | |
375 | return $cb->([AF_UNIX, $type, 0, Socket::pack_sockaddr_un $service]); |
518 | return $cb->([AF_UNIX, defined $type ? $type : SOCK_STREAM, 0, Socket::pack_sockaddr_un $service]); |
376 | } |
519 | } |
377 | |
520 | |
378 | unless (AF_INET6) { |
521 | unless (AF_INET6) { |
379 | $family != 6 |
522 | $family != 6 |
380 | or return $cb->(); |
523 | or return $cb->(); |
… | |
… | |
389 | $family ||= 6 unless $AnyEvent::PROTOCOL{ipv4}; |
532 | $family ||= 6 unless $AnyEvent::PROTOCOL{ipv4}; |
390 | |
533 | |
391 | $proto ||= "tcp"; |
534 | $proto ||= "tcp"; |
392 | $type ||= $proto eq "udp" ? SOCK_DGRAM : SOCK_STREAM; |
535 | $type ||= $proto eq "udp" ? SOCK_DGRAM : SOCK_STREAM; |
393 | |
536 | |
394 | my $proton = (getprotobyname $proto)[2] |
537 | my $proton = $PROTO_BYNAME{lc $proto} || (getprotobyname $proto)[2] |
395 | or Carp::croak "$proto: protocol unknown"; |
538 | or Carp::croak "$proto: protocol unknown"; |
396 | |
539 | |
397 | my $port; |
540 | my $port; |
398 | |
541 | |
399 | if ($service =~ /^(\S+)=(\d+)$/) { |
542 | if ($service =~ /^(\S+)=(\d+)$/) { |
… | |
… | |
424 | $cv->begin; |
567 | $cv->begin; |
425 | for my $idx (0 .. $#target) { |
568 | for my $idx (0 .. $#target) { |
426 | my ($node, $port) = @{ $target[$idx] }; |
569 | my ($node, $port) = @{ $target[$idx] }; |
427 | |
570 | |
428 | if (my $noden = parse_address $node) { |
571 | if (my $noden = parse_address $node) { |
|
|
572 | my $af = address_family $noden; |
|
|
573 | |
429 | if (4 == length $noden && $family != 6) { |
574 | if ($af == AF_INET && $family != 6) { |
430 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
575 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
431 | pack_sockaddr $port, $noden]] |
576 | pack_sockaddr $port, $noden]] |
432 | } |
577 | } |
433 | |
578 | |
434 | if (16 == length $noden && $family != 4) { |
579 | if ($af == AF_INET6 && $family != 4) { |
435 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
580 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
436 | pack_sockaddr $port, $noden]] |
581 | pack_sockaddr $port, $noden]] |
437 | } |
582 | } |
438 | } else { |
583 | } else { |
439 | # ipv4 |
584 | # ipv4 |
440 | if ($family != 6) { |
585 | if ($family != 6) { |
441 | $cv->begin; |
586 | $cv->begin; |
442 | a $node, sub { |
587 | AnyEvent::DNS::a $node, sub { |
443 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
588 | push @res, [$idx, "ipv4", [AF_INET, $type, $proton, |
444 | pack_sockaddr $port, parse_ipv4 $_]] |
589 | pack_sockaddr $port, parse_ipv4 $_]] |
445 | for @_; |
590 | for @_; |
446 | $cv->end; |
591 | $cv->end; |
447 | }; |
592 | }; |
448 | } |
593 | } |
449 | |
594 | |
450 | # ipv6 |
595 | # ipv6 |
451 | if ($family != 4) { |
596 | if ($family != 4) { |
452 | $cv->begin; |
597 | $cv->begin; |
453 | aaaa $node, sub { |
598 | AnyEvent::DNS::aaaa $node, sub { |
454 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
599 | push @res, [$idx, "ipv6", [AF_INET6, $type, $proton, |
455 | pack_sockaddr $port, parse_ipv6 $_]] |
600 | pack_sockaddr $port, parse_ipv6 $_]] |
456 | for @_; |
601 | for @_; |
457 | $cv->end; |
602 | $cv->end; |
458 | }; |
603 | }; |
… | |
… | |
465 | # try srv records, if applicable |
610 | # try srv records, if applicable |
466 | if ($node eq "localhost") { |
611 | if ($node eq "localhost") { |
467 | @target = (["127.0.0.1", $port], ["::1", $port]); |
612 | @target = (["127.0.0.1", $port], ["::1", $port]); |
468 | &$resolve; |
613 | &$resolve; |
469 | } elsif (defined $service && !parse_address $node) { |
614 | } elsif (defined $service && !parse_address $node) { |
470 | srv $service, $proto, $node, sub { |
615 | AnyEvent::DNS::srv $service, $proto, $node, sub { |
471 | my (@srv) = @_; |
616 | my (@srv) = @_; |
472 | |
617 | |
473 | # no srv records, continue traditionally |
618 | # no srv records, continue traditionally |
474 | @srv |
619 | @srv |
475 | or return &$resolve; |
620 | or return &$resolve; |
476 | |
621 | |
477 | # only srv record has "." => abort |
622 | # the only srv record has "." ("" here) => abort |
478 | $srv[0][2] ne "." || $#srv |
623 | $srv[0][2] ne "" || $#srv |
479 | or return $cb->(); |
624 | or return $cb->(); |
480 | |
625 | |
481 | # use srv records then |
626 | # use srv records then |
482 | @target = map ["$_->[3].", $_->[2]], |
627 | @target = map ["$_->[3].", $_->[2]], |
483 | grep $_->[3] ne ".", |
628 | grep $_->[3] ne ".", |
… | |
… | |
548 | lessen the impact of this windows bug, a default timeout of 30 seconds |
693 | lessen the impact of this windows bug, a default timeout of 30 seconds |
549 | will be imposed on windows. Cygwin is not affected. |
694 | will be imposed on windows. Cygwin is not affected. |
550 | |
695 | |
551 | Simple Example: connect to localhost on port 22. |
696 | Simple Example: connect to localhost on port 22. |
552 | |
697 | |
553 | tcp_connect localhost => 22, sub { |
698 | tcp_connect localhost => 22, sub { |
554 | my $fh = shift |
699 | my $fh = shift |
555 | or die "unable to connect: $!"; |
700 | or die "unable to connect: $!"; |
556 | # do something |
701 | # do something |
557 | }; |
702 | }; |
558 | |
703 | |
559 | Complex Example: connect to www.google.com on port 80 and make a simple |
704 | 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 |
705 | GET request without much error handling. Also limit the connection timeout |
561 | to 15 seconds. |
706 | to 15 seconds. |
562 | |
707 | |
… | |
… | |
609 | # also http://advogato.org/article/672.html |
754 | # also http://advogato.org/article/672.html |
610 | |
755 | |
611 | my %state = ( fh => undef ); |
756 | my %state = ( fh => undef ); |
612 | |
757 | |
613 | # name/service to type/sockaddr resolution |
758 | # name/service to type/sockaddr resolution |
614 | resolve_sockaddr $host, $port, 0, 0, 0, sub { |
759 | resolve_sockaddr $host, $port, 0, 0, undef, sub { |
615 | my @target = @_; |
760 | my @target = @_; |
616 | |
761 | |
617 | $state{next} = sub { |
762 | $state{next} = sub { |
618 | return unless exists $state{fh}; |
763 | return unless exists $state{fh}; |
619 | |
764 | |
… | |
… | |
640 | $state{next}(); |
785 | $state{next}(); |
641 | }) if $timeout; |
786 | }) if $timeout; |
642 | |
787 | |
643 | # called when the connect was successful, which, |
788 | # called when the connect was successful, which, |
644 | # in theory, could be the case immediately (but never is in practise) |
789 | # in theory, could be the case immediately (but never is in practise) |
645 | my $connected = sub { |
790 | $state{connected} = sub { |
646 | delete $state{ww}; |
791 | delete $state{ww}; |
647 | delete $state{to}; |
792 | delete $state{to}; |
648 | |
793 | |
649 | # we are connected, or maybe there was an error |
794 | # we are connected, or maybe there was an error |
650 | if (my $sin = getpeername $state{fh}) { |
795 | if (my $sin = getpeername $state{fh}) { |
651 | my ($port, $host) = unpack_sockaddr $sin; |
796 | my ($port, $host) = unpack_sockaddr $sin; |
652 | |
797 | |
653 | my $guard = guard { |
798 | my $guard = guard { %state = () }; |
654 | %state = (); |
|
|
655 | }; |
|
|
656 | |
799 | |
657 | $connect->($state{fh}, format_address $host, $port, sub { |
800 | $connect->(delete $state{fh}, format_address $host, $port, sub { |
658 | $guard->cancel; |
801 | $guard->cancel; |
659 | $state{next}(); |
802 | $state{next}(); |
660 | }); |
803 | }); |
661 | } else { |
804 | } else { |
662 | # dummy read to fetch real error code |
805 | # dummy read to fetch real error code |
… | |
… | |
665 | } |
808 | } |
666 | }; |
809 | }; |
667 | |
810 | |
668 | # now connect |
811 | # now connect |
669 | if (connect $state{fh}, $sockaddr) { |
812 | if (connect $state{fh}, $sockaddr) { |
670 | $connected->(); |
813 | $state{connected}->(); |
671 | } elsif ($! == &Errno::EINPROGRESS # POSIX |
814 | } elsif ($! == &Errno::EINPROGRESS # POSIX |
672 | || $! == &Errno::EWOULDBLOCK |
815 | || $! == &Errno::EWOULDBLOCK |
673 | # WSAEINPROGRESS intentionally not checked - it means something else entirely |
816 | # WSAEINPROGRESS intentionally not checked - it means something else entirely |
674 | || $! == AnyEvent::Util::WSAEINVAL # not convinced, but doesn't hurt |
817 | || $! == AnyEvent::Util::WSAEINVAL # not convinced, but doesn't hurt |
675 | || $! == AnyEvent::Util::WSAEWOULDBLOCK) { |
818 | || $! == AnyEvent::Util::WSAEWOULDBLOCK) { |
676 | $state{ww} = AnyEvent->io (fh => $state{fh}, poll => 'w', cb => $connected); |
819 | $state{ww} = AnyEvent->io (fh => $state{fh}, poll => 'w', cb => $state{connected}); |
677 | } else { |
820 | } else { |
678 | $state{next}(); |
821 | $state{next}(); |
679 | } |
822 | } |
680 | }; |
823 | }; |
681 | |
824 | |
… | |
… | |
691 | Create and bind a stream socket to the given host, and port, set the |
834 | 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 |
835 | SO_REUSEADDR flag (if applicable) and call C<listen>. Unlike the name |
693 | implies, this function can also bind on UNIX domain sockets. |
836 | implies, this function can also bind on UNIX domain sockets. |
694 | |
837 | |
695 | For internet sockets, C<$host> must be an IPv4 or IPv6 address (or |
838 | 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 |
839 | C<undef>, in which case it binds either to C<0> or to C<::>, depending |
697 | whether IPv4 or IPv6 is the preferred protocol). |
840 | on whether IPv4 or IPv6 is the preferred protocol, and maybe to both in |
|
|
841 | future versions, as applicable). |
698 | |
842 | |
699 | To bind to the IPv4 wildcard address, use C<0>, to bind to the IPv6 |
843 | To bind to the IPv4 wildcard address, use C<0>, to bind to the IPv6 |
700 | wildcard address, use C<::>. |
844 | wildcard address, use C<::>. |
701 | |
845 | |
702 | The port is specified by C<$service>, which must be either a service name or |
846 | 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 |
870 | address and port number of the local socket endpoint as second and third |
727 | arguments. |
871 | arguments. |
728 | |
872 | |
729 | It should return the length of the listen queue (or C<0> for the default). |
873 | It should return the length of the listen queue (or C<0> for the default). |
730 | |
874 | |
|
|
875 | Note to IPv6 users: RFC-compliant behaviour for IPv6 sockets listening on |
|
|
876 | C<::> is to bind to both IPv6 and IPv4 addresses by default on dual-stack |
|
|
877 | hosts. Unfortunately, only GNU/Linux seems to implement this properly, so |
|
|
878 | if you want both IPv4 and IPv6 listening sockets you should create the |
|
|
879 | IPv6 socket first and then attempt to bind on the IPv4 socket, but ignore |
|
|
880 | any C<EADDRINUSE> errors. |
|
|
881 | |
731 | Example: bind on some TCP port on the local machine and tell each client |
882 | Example: bind on some TCP port on the local machine and tell each client |
732 | to go away. |
883 | to go away. |
733 | |
884 | |
734 | tcp_server undef, undef, sub { |
885 | tcp_server undef, undef, sub { |
735 | my ($fh, $host, $port) = @_; |
886 | my ($fh, $host, $port) = @_; |
… | |
… | |
738 | }, sub { |
889 | }, sub { |
739 | my ($fh, $thishost, $thisport) = @_; |
890 | my ($fh, $thishost, $thisport) = @_; |
740 | warn "bound to $thishost, port $thisport\n"; |
891 | warn "bound to $thishost, port $thisport\n"; |
741 | }; |
892 | }; |
742 | |
893 | |
|
|
894 | Example: bind a server on a unix domain socket. |
|
|
895 | |
|
|
896 | tcp_server "unix/", "/tmp/mydir/mysocket", sub { |
|
|
897 | my ($fh) = @_; |
|
|
898 | }; |
|
|
899 | |
743 | =cut |
900 | =cut |
744 | |
901 | |
745 | sub tcp_server($$$;$) { |
902 | sub tcp_server($$$;$) { |
746 | my ($host, $service, $accept, $prepare) = @_; |
903 | my ($host, $service, $accept, $prepare) = @_; |
747 | |
904 | |
… | |
… | |
764 | or Carp::croak "tcp_server/socket: $!"; |
921 | or Carp::croak "tcp_server/socket: $!"; |
765 | |
922 | |
766 | if ($af == AF_INET || $af == AF_INET6) { |
923 | if ($af == AF_INET || $af == AF_INET6) { |
767 | setsockopt $state{fh}, SOL_SOCKET, SO_REUSEADDR, 1 |
924 | setsockopt $state{fh}, SOL_SOCKET, SO_REUSEADDR, 1 |
768 | or Carp::croak "tcp_server/so_reuseaddr: $!" |
925 | or Carp::croak "tcp_server/so_reuseaddr: $!" |
769 | unless !AnyEvent::WIN32; # work around windows bug |
926 | unless AnyEvent::WIN32; # work around windows bug |
770 | |
927 | |
771 | unless ($service =~ /^\d*$/) { |
928 | unless ($service =~ /^\d*$/) { |
772 | $service = (getservbyname $service, "tcp")[2] |
929 | $service = (getservbyname $service, "tcp")[2] |
773 | or Carp::croak "$service: service unknown" |
930 | or Carp::croak "$service: service unknown" |
774 | } |
931 | } |
… | |
… | |
795 | |
952 | |
796 | $state{aw} = AnyEvent->io (fh => $state{fh}, poll => 'r', cb => sub { |
953 | $state{aw} = AnyEvent->io (fh => $state{fh}, poll => 'r', cb => sub { |
797 | # this closure keeps $state alive |
954 | # this closure keeps $state alive |
798 | while (my $peer = accept my $fh, $state{fh}) { |
955 | while (my $peer = accept my $fh, $state{fh}) { |
799 | fh_nonblocking $fh, 1; # POSIX requires inheritance, the outside world does not |
956 | fh_nonblocking $fh, 1; # POSIX requires inheritance, the outside world does not |
|
|
957 | |
800 | my ($service, $host) = unpack_sockaddr $peer; |
958 | my ($service, $host) = unpack_sockaddr $peer; |
801 | $accept->($fh, format_address $host, $service); |
959 | $accept->($fh, format_address $host, $service); |
802 | } |
960 | } |
803 | }); |
961 | }); |
804 | |
962 | |
… | |
… | |
809 | |
967 | |
810 | 1; |
968 | 1; |
811 | |
969 | |
812 | =back |
970 | =back |
813 | |
971 | |
|
|
972 | =head1 SECURITY CONSIDERATIONS |
|
|
973 | |
|
|
974 | This module is quite powerful, with with power comes the ability to abuse |
|
|
975 | as well: If you accept "hostnames" and ports from untrusted sources, |
|
|
976 | then note that this can be abused to delete files (host=C<unix/>). This |
|
|
977 | is not really a problem with this module, however, as blindly accepting |
|
|
978 | any address and protocol and trying to bind a server or connect to it is |
|
|
979 | harmful in general. |
|
|
980 | |
814 | =head1 AUTHOR |
981 | =head1 AUTHOR |
815 | |
982 | |
816 | Marc Lehmann <schmorp@schmorp.de> |
983 | Marc Lehmann <schmorp@schmorp.de> |
817 | http://home.schmorp.de/ |
984 | http://home.schmorp.de/ |
818 | |
985 | |