tcpd

一个很好的unix网络编程框架

#! /usr/bin/perl5
$tcpdump = "/usr/sbin/tcpdump";
open( TCPD, "$tcpdump @ARGV |" ) ||
	die "couldn't start tcpdump: \$!\\n";
$| = 1;
while ( <TCPD> )
{
	if ( /^\t/ )
	{
		chop;
		$str = $_;
		$str =~ tr / \t//d;
		$str = pack "H*" , $str;
		$str =~ tr/\x0-\x1f\x7f-\xff/./;
		printf "\t%-40s\t%s\n", substr( $_, 4 ), $str;
	}
	else
	{
		print;
	}
}