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1 | package Socket; |
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2 | |
3 | use vars qw($VERSION @ISA @EXPORT); |
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4 | $VERSION = "1.6"; |
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5 | |
6 | =head1 NAME |
7 | |
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8 | Socket, sockaddr_in, sockaddr_un, inet_aton, inet_ntoa - load the C socket.h defines and structure manipulators |
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9 | |
10 | =head1 SYNOPSIS |
11 | |
12 | use Socket; |
13 | |
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14 | $proto = getprotobyname('udp'); |
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15 | socket(Socket_Handle, PF_INET, SOCK_DGRAM, $proto); |
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16 | $iaddr = gethostbyname('hishost.com'); |
17 | $port = getservbyname('time', 'udp'); |
18 | $sin = sockaddr_in($port, $iaddr); |
19 | send(Socket_Handle, 0, 0, $sin); |
20 | |
21 | $proto = getprotobyname('tcp'); |
22 | socket(Socket_Handle, PF_INET, SOCK_STREAM, $proto); |
23 | $port = getservbyname('smtp'); |
24 | $sin = sockaddr_in($port,inet_aton("127.1")); |
25 | $sin = sockaddr_in(7,inet_aton("localhost")); |
26 | $sin = sockaddr_in(7,INADDR_LOOPBACK); |
27 | connect(Socket_Handle,$sin); |
28 | |
29 | ($port, $iaddr) = sockaddr_in(getpeername(Socket_Handle)); |
30 | $peer_host = gethostbyaddr($iaddr, AF_INET); |
31 | $peer_addr = inet_ntoa($iaddr); |
32 | |
33 | $proto = getprotobyname('tcp'); |
34 | socket(Socket_Handle, PF_UNIX, SOCK_STREAM, $proto); |
35 | unlink('/tmp/usock'); |
36 | $sun = sockaddr_un('/tmp/usock'); |
37 | connect(Socket_Handle,$sun); |
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38 | |
39 | =head1 DESCRIPTION |
40 | |
41 | This module is just a translation of the C F<socket.h> file. |
42 | Unlike the old mechanism of requiring a translated F<socket.ph> |
43 | file, this uses the B<h2xs> program (see the Perl source distribution) |
44 | and your native C compiler. This means that it has a |
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45 | far more likely chance of getting the numbers right. This includes |
46 | all of the commonly used pound-defines like AF_INET, SOCK_STREAM, etc. |
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47 | |
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48 | In addition, some structure manipulation functions are available: |
49 | |
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50 | =over |
51 | |
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52 | =item inet_aton HOSTNAME |
53 | |
54 | Takes a string giving the name of a host, and translates that |
55 | to the 4-byte string (structure). Takes arguments of both |
56 | the 'rtfm.mit.edu' type and '18.181.0.24'. If the host name |
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57 | cannot be resolved, returns undef. For multi-homed hosts (hosts |
58 | with more than one address), the first address found is returned. |
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59 | |
60 | =item inet_ntoa IP_ADDRESS |
61 | |
62 | Takes a four byte ip address (as returned by inet_aton()) |
63 | and translates it into a string of the form 'd.d.d.d' |
64 | where the 'd's are numbers less than 256 (the normal |
65 | readable four dotted number notation for internet addresses). |
66 | |
67 | =item INADDR_ANY |
68 | |
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69 | Note: does not return a number, but a packed string. |
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70 | |
71 | Returns the 4-byte wildcard ip address which specifies any |
72 | of the hosts ip addresses. (A particular machine can have |
73 | more than one ip address, each address corresponding to |
74 | a particular network interface. This wildcard address |
75 | allows you to bind to all of them simultaneously.) |
76 | Normally equivalent to inet_aton('0.0.0.0'). |
77 | |
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78 | =item INADDR_BROADCAST |
79 | |
80 | Note: does not return a number, but a packed string. |
81 | |
82 | Returns the 4-byte 'this-lan' ip broadcast address. |
83 | This can be useful for some protocols to solicit information |
84 | from all servers on the same LAN cable. |
85 | Normally equivalent to inet_aton('255.255.255.255'). |
86 | |
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87 | =item INADDR_LOOPBACK |
88 | |
89 | Note - does not return a number. |
90 | |
91 | Returns the 4-byte loopback address. Normally equivalent |
92 | to inet_aton('localhost'). |
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93 | |
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94 | =item INADDR_NONE |
95 | |
96 | Note - does not return a number. |
97 | |
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98 | Returns the 4-byte 'invalid' ip address. Normally equivalent |
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99 | to inet_aton('255.255.255.255'). |
100 | |
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101 | =item sockaddr_in PORT, ADDRESS |
102 | |
103 | =item sockaddr_in SOCKADDR_IN |
104 | |
105 | In an array context, unpacks its SOCKADDR_IN argument and returns an array |
106 | consisting of (PORT, ADDRESS). In a scalar context, packs its (PORT, |
107 | ADDRESS) arguments as a SOCKADDR_IN and returns it. If this is confusing, |
108 | use pack_sockaddr_in() and unpack_sockaddr_in() explicitly. |
109 | |
110 | =item pack_sockaddr_in PORT, IP_ADDRESS |
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111 | |
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112 | Takes two arguments, a port number and a 4 byte IP_ADDRESS (as returned by |
113 | inet_aton()). Returns the sockaddr_in structure with those arguments |
114 | packed in with AF_INET filled in. For internet domain sockets, this |
115 | structure is normally what you need for the arguments in bind(), |
116 | connect(), and send(), and is also returned by getpeername(), |
117 | getsockname() and recv(). |
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118 | |
119 | =item unpack_sockaddr_in SOCKADDR_IN |
120 | |
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121 | Takes a sockaddr_in structure (as returned by pack_sockaddr_in()) and |
122 | returns an array of two elements: the port and the 4-byte ip-address. |
123 | Will croak if the structure does not have AF_INET in the right place. |
124 | |
125 | =item sockaddr_un PATHNAME |
126 | |
127 | =item sockaddr_un SOCKADDR_UN |
128 | |
129 | In an array context, unpacks its SOCKADDR_UN argument and returns an array |
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130 | consisting of (PATHNAME). In a scalar context, packs its PATHNAME |
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131 | arguments as a SOCKADDR_UN and returns it. If this is confusing, use |
132 | pack_sockaddr_un() and unpack_sockaddr_un() explicitly. |
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133 | These are only supported if your system has E<lt>F<sys/un.h>E<gt>. |
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134 | |
135 | =item pack_sockaddr_un PATH |
136 | |
137 | Takes one argument, a pathname. Returns the sockaddr_un structure with |
138 | that path packed in with AF_UNIX filled in. For unix domain sockets, this |
139 | structure is normally what you need for the arguments in bind(), |
140 | connect(), and send(), and is also returned by getpeername(), |
141 | getsockname() and recv(). |
142 | |
143 | =item unpack_sockaddr_un SOCKADDR_UN |
144 | |
145 | Takes a sockaddr_un structure (as returned by pack_sockaddr_un()) |
146 | and returns the pathname. Will croak if the structure does not |
147 | have AF_UNIX in the right place. |
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148 | |
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149 | =back |
150 | |
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151 | =cut |
152 | |
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153 | use Carp; |
154 | |
155 | require Exporter; |
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156 | require DynaLoader; |
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157 | @ISA = qw(Exporter DynaLoader); |
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158 | @EXPORT = qw( |
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159 | inet_aton inet_ntoa pack_sockaddr_in unpack_sockaddr_in |
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160 | pack_sockaddr_un unpack_sockaddr_un |
161 | sockaddr_in sockaddr_un |
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162 | INADDR_ANY INADDR_BROADCAST INADDR_LOOPBACK INADDR_NONE |
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163 | AF_802 |
164 | AF_APPLETALK |
165 | AF_CCITT |
166 | AF_CHAOS |
167 | AF_DATAKIT |
168 | AF_DECnet |
169 | AF_DLI |
170 | AF_ECMA |
171 | AF_GOSIP |
172 | AF_HYLINK |
173 | AF_IMPLINK |
174 | AF_INET |
175 | AF_LAT |
176 | AF_MAX |
177 | AF_NBS |
178 | AF_NIT |
179 | AF_NS |
180 | AF_OSI |
181 | AF_OSINET |
182 | AF_PUP |
183 | AF_SNA |
184 | AF_UNIX |
185 | AF_UNSPEC |
186 | AF_X25 |
187 | MSG_DONTROUTE |
188 | MSG_MAXIOVLEN |
189 | MSG_OOB |
190 | MSG_PEEK |
191 | PF_802 |
192 | PF_APPLETALK |
193 | PF_CCITT |
194 | PF_CHAOS |
195 | PF_DATAKIT |
196 | PF_DECnet |
197 | PF_DLI |
198 | PF_ECMA |
199 | PF_GOSIP |
200 | PF_HYLINK |
201 | PF_IMPLINK |
202 | PF_INET |
203 | PF_LAT |
204 | PF_MAX |
205 | PF_NBS |
206 | PF_NIT |
207 | PF_NS |
208 | PF_OSI |
209 | PF_OSINET |
210 | PF_PUP |
211 | PF_SNA |
212 | PF_UNIX |
213 | PF_UNSPEC |
214 | PF_X25 |
215 | SOCK_DGRAM |
216 | SOCK_RAW |
217 | SOCK_RDM |
218 | SOCK_SEQPACKET |
219 | SOCK_STREAM |
220 | SOL_SOCKET |
221 | SOMAXCONN |
222 | SO_ACCEPTCONN |
223 | SO_BROADCAST |
224 | SO_DEBUG |
225 | SO_DONTLINGER |
226 | SO_DONTROUTE |
227 | SO_ERROR |
228 | SO_KEEPALIVE |
229 | SO_LINGER |
230 | SO_OOBINLINE |
231 | SO_RCVBUF |
232 | SO_RCVLOWAT |
233 | SO_RCVTIMEO |
234 | SO_REUSEADDR |
235 | SO_SNDBUF |
236 | SO_SNDLOWAT |
237 | SO_SNDTIMEO |
238 | SO_TYPE |
239 | SO_USELOOPBACK |
240 | ); |
241 | |
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242 | sub sockaddr_in { |
243 | if (@_ == 6 && !wantarray) { # perl5.001m compat; use this && die |
244 | my($af, $port, @quad) = @_; |
245 | carp "6-ARG sockaddr_in call is deprecated" if $^W; |
246 | pack_sockaddr_in($port, inet_aton(join('.', @quad))); |
247 | } elsif (wantarray) { |
248 | croak "usage: (port,iaddr) = sockaddr_in(sin_sv)" unless @_ == 1; |
249 | unpack_sockaddr_in(@_); |
250 | } else { |
251 | croak "usage: sin_sv = sockaddr_in(port,iaddr))" unless @_ == 2; |
252 | pack_sockaddr_in(@_); |
253 | } |
254 | } |
255 | |
256 | sub sockaddr_un { |
257 | if (wantarray) { |
258 | croak "usage: (filename) = sockaddr_un(sun_sv)" unless @_ == 1; |
259 | unpack_sockaddr_un(@_); |
260 | } else { |
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261 | croak "usage: sun_sv = sockaddr_un(filename)" unless @_ == 1; |
262 | pack_sockaddr_un(@_); |
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263 | } |
264 | } |
265 | |
266 | |
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267 | sub AUTOLOAD { |
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268 | my($constname); |
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269 | ($constname = $AUTOLOAD) =~ s/.*:://; |
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270 | my $val = constant($constname, @_ ? $_[0] : 0); |
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271 | if ($! != 0) { |
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272 | my ($pack,$file,$line) = caller; |
273 | croak "Your vendor has not defined Socket macro $constname, used"; |
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274 | } |
275 | eval "sub $AUTOLOAD { $val }"; |
276 | goto &$AUTOLOAD; |
277 | } |
278 | |
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279 | bootstrap Socket $VERSION; |
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280 | |
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281 | 1; |