我想构建一个软件路由器。
我编写了代码来打开套接字,接收数据并打印其接收的数据。 GUI将使用Tk
编写
下面是代码的简单版本,它基本上完成了我想做的事情,除了不分叉new_port子例程。每次我点击提交按钮时,Tk窗口都会卡住。如果有人可以协助将一个分支添加到new_port子例程中,那么它会产生一个新的子进程。我的想法是,我可以填写表格中的新端口并点击sumbit。窗口关闭,我然后再次按下新的端口,现在第二个插座与第一个插座同时打开。 I.E端口1234和5678正在同时收听。
#!/usr/bin/perl -w
use IO::Socket::INET;
use Tk;
$myip = `ifconfig | grep -i inet | head -1 | cut -d ":" -f2 | cut -d " " -f1`;
sub new_port {
my $socket = new IO::Socket::INET (
LocalHost => "$myip",
LocalPort => "$myport",
Proto => 'tcp'
Reuse => 1);
die "Cannot create socket on local host" unless $socket;
print "Server waiting for client connection on port $myport\n";
while(1)
{
my $client_socket = $socket->accept();
my $client_address = $client_socket->peerhost();
my $client_port = $client_socket->peerport();
my $input_data = "";
my $received_data = "";
do
{
$client_socket->recv($received_data, 65536);
$input_data = $input_data . $received_data;
} while ($received_data ne "");
print "INPUT----------------------------------\n";
print "Data from $client_address on port $client_port\n";
print $input_data;
shutdown($client_socket, 1);
}
}
sub new_port_window {
my $sw = MainWindow->new;
$sw->geometry("200x100");
$sw->title("port opener");
$sw->Label(-text "Insert port #")->place(-anchor => 'center', -relx => 0.5, -rely => 0.2);
$sw->Entry(-bg => 'white', -fg => 'black', -textvariable => \$myport)->place(-anchor => 'center', -relx => 0.5, -rely => 0.4);
$sw->Button(-text "submit", -command => sub{new_port})->place(width => 100,
-anchor => "center",
-relx => 0.5,
-rely => 0.8);
}
my $mw = MainWindow->new;
$mw->geometry("150x100");
$mw->title("GUI TEST NEW FUNCTION");
$mw->Label(-text => "click new")->place(-anchor => "center", -relx => 0.5, -rely => 0.3);
$mw->Button(-text => "NEW", -command =>sub{new_port_window})->place(-width => 50, -anchor => "center", -relx => 0.5, -rely => 0.8);
MainLoop;
所以我能够通过大量实验来完成这项工作。诀窍是分叉子例程并将pid存储在稍后用于杀死进程的文件中,该进程由于处于无限循环而永不退出。
Sub forker {
$pid = fork ();
if ( $pid == 0 ) {
new_port();
}
my $pid_file = 'router.pid';
open (my $pidlog, '>>', $pid_file) or die "cannot open file";
print $pidlog "$pid\n";
close $pidlog;
}