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package App::pnc; |
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3
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our $VERSION = '0.02'; |
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5
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1
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1
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23060
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use strict; |
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3
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1
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44
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6
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1
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1
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use warnings; |
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3
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1
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42
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7
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8
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1
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1
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914
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use Socket; |
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1
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3829
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1
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532
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9
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1
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1
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7
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use Carp; |
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2
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1
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45
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10
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1
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1
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4
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use Fcntl qw(F_GETFL F_SETFL O_NONBLOCK); |
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2
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1
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39
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11
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1
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1
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683
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use Errno qw(ENOTSOCK); |
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1222
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1
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916
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12
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13
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our $max_buffer_size = 64 * 1024; |
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15
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require Exporter; |
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our @ISA = qw(Exporter); |
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our @EXPORT_OK = qw(netcat4 netcat_socket); |
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19
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sub netcat4 { |
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0
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0
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my ($server, $port) = @_; |
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0
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0
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if ($port =~ /\D/) { |
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0
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0
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$port = getservbyname($port, 'tcp') |
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or croak "unable to convert service name to port number: $!"; |
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} |
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0
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0
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my $iaddr = inet_aton($server) or croak "unable to resolve host name: $!"; |
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0
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my $paddr = sockaddr_in($port, $iaddr); |
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0
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0
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socket (my $socket, AF_INET, SOCK_STREAM, 0) or croak "unable to create socket: $!"; |
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0
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0
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connect ($socket, $paddr) or croak "unable to connect to host: $!"; |
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0
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netcat_socket($socket); |
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} |
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sub netcat6 { |
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#my ($server, $port) = @_; |
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#netcat_socket($server, AF_INET6, $port); |
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0
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0
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0
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croak "not implemented yet!"; |
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} |
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39
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sub _shutdown { |
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0
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0
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my ($socket, $dir) = @_; |
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0
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0
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unless (shutdown($socket, $dir)) { |
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0
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0
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if ($! == ENOTSOCK) { |
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0
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return close ($socket); |
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} |
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} |
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0
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undef; |
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} |
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49
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sub netcat_socket { |
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0
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0
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0
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my $socket = shift; |
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52
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0
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for my $fh ($socket, *STDIN, *STDOUT) { |
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0
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my $flags = fcntl($fh, F_GETFL, 0); |
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0
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fcntl($fh, F_SETFL, fcntl($fh, F_GETFL, 0) | O_NONBLOCK); |
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0
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binmode $fh; |
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} |
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58
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0
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my @in = (*STDIN, $socket); |
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0
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my @out = ($socket, *STDOUT); |
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0
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my @buffer = ('', ''); |
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62
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0
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my @in_open = (1, 1); |
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0
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my @out_open = (1, 1); |
64
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65
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0
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local $SIG{PIPE} = 'IGNORE'; |
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67
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0
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while (grep $_, @in_open, @out_open) { |
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0
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my $iv = ''; |
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0
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my $ov = ''; |
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0
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for my $ix (0, 1) { |
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0
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0
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0
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if ($in_open[$ix] and length $buffer[$ix] < $max_buffer_size) { |
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0
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vec($iv, fileno($in[$ix]), 1) = 1; |
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} |
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0
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0
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0
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if ($out_open[$ix] and length $buffer[$ix] > 0) { |
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0
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vec($ov, fileno($out[$ix]), 1) = 1; |
76
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} |
77
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} |
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0
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0
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if (select($iv, $ov, undef, 5) > 0) { |
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0
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for my $ix (0, 1) { |
80
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0
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0
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0
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if ($in_open[$ix] and vec($iv, fileno($in[$ix]), 1)) { |
81
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0
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my $bytes = sysread($in[$ix], $buffer[$ix], 16 * 1024, length $buffer[$ix]); |
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0
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0
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unless ($bytes) { |
83
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0
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$in_open[$ix] = 0; |
84
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0
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_shutdown($in[$ix], 0); |
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0
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0
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unless (length $buffer[$ix]) { |
86
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0
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$out_open[$ix] = 0; |
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0
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_shutdown($out[$ix], 1); |
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} |
89
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} |
90
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} |
91
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0
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0
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0
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if ($out_open[$ix] and vec($ov, fileno($out[$ix]), 1)) { |
92
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0
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my $bytes = syswrite($out[$ix], $buffer[$ix], 16 * 1024); |
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0
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0
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if ($bytes) { |
94
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0
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substr($buffer[$ix], 0, $bytes, ''); |
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0
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0
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0
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unless ($in_open[$ix] or length $buffer[$ix]) { |
96
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0
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$out_open[$ix] = 0; |
97
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0
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_shutdown($out[$ix], 1); |
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} |
99
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} |
100
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else { |
101
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0
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$out_open[$ix] = 0; |
102
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0
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_shutdown($out[$ix], 1); |
103
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0
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$buffer[$ix] = ''; |
104
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0
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0
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if ($in_open[$ix]) { |
105
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0
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$in_open[$ix] = 0; |
106
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0
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_shutdown($in[$ix], 0); |
107
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} |
108
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} |
109
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} |
110
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} |
111
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} |
112
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} |
113
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0
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for my $fd ($socket, *STDIN, *STDOUT) { |
114
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0
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close $fd; |
115
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} |
116
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} |
117
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118
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0
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0
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0
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sub version { "pnc $VERSION - a netcat alike program written in Perl\n\n" } |
119
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120
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unless (defined caller) { |
121
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if (@ARGV == 1 and $ARGV[0] eq '-V') { |
122
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print version(); |
123
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} |
124
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elsif (@ARGV == 2) { |
125
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netcat4(@ARGV); |
126
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} |
127
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else { |
128
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@ARGV == 2 or die "Usage:\n pnc host port\n\n"; |
129
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} |
130
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} |
131
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132
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133
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1; |
134
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135
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__END__ |