1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
#!/usr/bin/perl -w
# $Id: clientproxy,v 2.8 1999/01/20 14:56:23 hasegawa Exp $
# copyright (c)1997-1999 Yoshinori Hasegawa <hasegawa@madoka.org>
if ($] < 5) {
foreach $inc (@INC) {
if (-r "$inc/sys/socket.ph") {
eval 'require "sys/socket.ph"';
$SOCKET = "$inc/sys/socket.ph" unless $@;
last;
}
if (-r "$inc/socket.ph") {
eval 'require "socket.ph"';
$SOCKET = "$inc/socket.ph" unless $@;
last;
}
}
} else {
eval 'use Socket';
$SOCKET = 'Socket.pm' unless $@;
}
$NIL = $;;
$READSIZE = 1024;
$SOCKADDR = 'S n N x8';
$PROTO = (getprotobyname('tcp'))[2];
$AF_INET = eval '&AF_INET' || 2;
$PF_INET = eval '&PF_INET' || 2;
$SOCK_STREAM = eval '&SOCK_STREAM' || 1;
$'rin = '';
$handle = 0;
$SIG{'PIPE'} = 'IGNORE' if &'exist(&'list(keys(%SIG)), 'PIPE');
&main(@ARGV);
sub main {
local(@args) = @_;
local($rout, $nf, $sno1, $sno2, $socket, $tmp);
if (@args < 4) {
&usage();
exit(1);
}
$sno1 = &'connect($args[0], $args[1]) || die "cannot connect to server\n";
$sno2 = &'connect($args[2], $args[3]) || die "cannot connect to server\n";
for (;;) {
$nf = select($rout = $'rin, undef, undef, undef);
die "error in select\n" if $nf < 0;
if (vec($rout, $sno1, 1)) {
$tmp = '';
if (sysread($'socket[$sno1], $tmp, $READSIZE)) {
$socket = $'socket[$sno2];
print $socket $tmp;
} else {
&'close($sno1);
&'close($sno2);
exit;
}
}
if (vec($rout, $sno2, 1)) {
$tmp = '';
if (sysread($'socket[$sno2], $tmp, $READSIZE)) {
$socket = $'socket[$sno1];
print $socket $tmp;
} else {
&'close($sno2);
&'close($sno1);
exit;
}
}
}
}
sub usage {
print 'usage: perl clientproxy <server> <port> <server> <port>', "\n";
}
sub 'connect {
local($host, $port) = @_;
local($serverno, $socket, $ip, @addr, $name);
if ($host =~ /^\d+$/) {
$ip = $host;
} elsif ($host =~ /^[\d\.]+$/) {
@addr = split(/\./, $host);
$ip = unpack('N', pack('C4', @addr, 0, 0, 0));
} else {
$ip = unpack('N', (gethostbyname($host))[4] || "\0\0\0\0");
}
return 0 unless $ip;
$socket = '\'S' . ++$handle;
socket($socket, $PF_INET, $SOCK_STREAM, $PROTO) || return 0;
$name = pack($SOCKADDR, $AF_INET, $port, $ip);
connect($socket, $name) || return 0;
binmode($socket);
$serverno = fileno($socket);
vec($'rin, $serverno, 1) = 1;
$'socket[$serverno] = $socket;
select((select($socket), $| = 1)[0]);
return $serverno;
}
sub 'close {
local($no) = @_;
close($'socket[$no]);
vec($'rin, $no, 1) = 0;
}
sub 'exist {
local($list, @items) = @_;
return 0 unless $list;
$list .= $NIL;
foreach $item (@items) {
return 1 if index("\L$list\E", $NIL . "\L$item\E" . $NIL) != -1;
}
return 0;
}
sub 'list {
local(@array) = @_;
return join($NIL, '', @array);
}
sub 'array {
local($list) = @_;
return () unless $list;
$list = substr($list, 1);
return () unless $list;
return split(/$NIL/, $list);
}
|
