创建一个软件路由器

Question

我想构建一个软件路由器。

我已经编写了打开套接字、接收数据并打印其接收到的数据的代码。 GUI 将使用 Tk

下面是代码的一个简单版本，它基本上完成了我想做的事情，除了没有分叉 new_port 子例程。每次我单击提交按钮时，Tk window 都会卡住。如果有人可以协助添加一个分支到 new_port 子例程，以便它产生一个新的子进程。我的想法是我可以在表格中填写一个新端口并点击 sumbit。 window 关闭，然后我再次按新键放入一个新端口，现在第二个套接字与第一个套接字同时打开。 I.E端口1234和5678同时被监听

#!/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;

Answer 1

所以我能够通过大量实验来实现这一点。诀窍是分叉子例程并将 pid 存储在一个文件中，以便稍后用于终止进程，该进程由于处于无限循环中而永远不会退出。

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;
  }

创建一个软件路由器

Creating a software router

perl

tk

inet