#!/usr/bin/perl
use IO::Socket;
my $welcome_msg = <<"EOT";
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 _    _  98   _________   ______   ______  _    _  _____  ______   ______ 
\\ \\  / /     | | | | | \\ | |  | | | |     | |  | |  | |  | |  \\ \\ | |     
 >|--|<      | | | | | | | |__| | | |     | |--| |  | |  | |  | | | |---- 
/_/  \\_\\     |_| |_| |_| |_|  |_| |_|____ |_|  |_| _|_|_ |_|  |_| |_|____ 
                                       
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

#Only SAM is allowed

EOT
$|=1;
$lis = IO::Socket::INET->new (LocalPort => 3000, 
							  Type => SOCK_STREAM, 
							  Reuse=> 1, 
							  Listen => 1000) or die "Error #1 $@\n";



open(agentz,">>agents");
		  
$authenticated = 0;
$logs = "";
sub show_help{
	print $c "\nDisplay Agents Names  : agents";
	print $c "\nShow Agent Details    : details agent_name";
	print $c "\nAdd Agent             : add <agent_name> <age> <origin>";
	print $c "\nPending Data          : pending";
	print $c "\nConfirm modifications : confirm\n";
}
sub agents_display(){
	$i=0;
	open(agents,"agents");
	@aFile=<agents>;
	foreach(@aFile){
		$LL = $aFile[$i];
		if($LL=~ m/^(.*),(.*),(.*),(.*)/i){
			$agentn=$1;
			print $c "".$agentn."\n";
		}
		$i++;
	}
	close(agents);
}
sub details_agent{
	$i=0;
	$agent_n = $_[0];
	open(agents,"agents");
	@aFile=<agents>;
	foreach(@aFile){
		$LL = $aFile[$i];
		if($LL=~ m/(.*),(.*),(.*),(.*)/i){
			if($agent_n eq $1){
				print $c "Name : ".$1." - Age : ".$2." - Origin : ".$3." - Home : ".$4."\n";
			}
		}
		$i++;
	}
	close (agents);
}
sub add_agent{
	$agent_n = $_[0];
	$age     = $_[1];
	$origin  = $_[2];
	do{
		$rand=int(rand(10000));
		$home = "agent".$rand;
	}while(-d $home);
	if($logs eq ""){
		$logs.=$agent_n.",".$age.",".$origin.",".$home."\n";
		print $c "\nAgent Added !\n";
	}else{
		print $c "\nyou can only add one agent before confirming\n";
	}
}
sub pending{
	if($logs eq ""){
		print $c "\nNothing Pending\n";
	}else{
		print $c "\n".$logs."\n";
	}
}
sub confirm{
	$conf = 0;
  if($logs=~ m/^(.*?),(.*?),(.*?),(.*)/){
    $home=$4;
	$d1=$1;
	$d2=$2;
	$d3=$3;	
	if($home=~ /^[A-OQ-Za-oq-z0-9\s|=\$\/,]+$/ || $d1=~/^[A-OQ-Za-oq-z0-9\s|=\$\/,]+$/ || $d2=~/^[A-OQ-Za-oq-z0-9\s|=\$\/,]+$/ || 
$d3=~/^[A-OQ-Za-oq-z0-9\s|=\$\/,]+$/){
			$cmd="echo \"$d1,$d2,$d3\" > ".$home;
			$ex=`$cmd`;
			if($? == -1){
				print $c "\ncommand failed\n";
				$logs="";
				$conf=0;
			}else{
				print $c "\nWriting agent details at file $home with success\n";
				$conf=1;
			}
		}else{
			print $c "\nError : Non allowed char used Or command way too long\n";
			$logs="";
			$conf=0;
		}
	}
	if($conf){$logs="";print $c "\nConfirmed\n";}
}
while($c = $lis->accept()){
	$start=0;
	if($pid=fork){
		next;
	}else{
		unless (defined $pid) {die "Threads problem $! \n";}
		print $c $welcome_msg."UserName : ";
		$username = <$c>;
		print $c "Password : ";
		$password = <$c>;
		chomp($username);
		chomp($password);
		if($username eq 'SAM' && $password eq 'pass'){
			$authenticated=1;
			print $c "\nWelcome SAM\n";
			print $c "\n> ";
		}else{
			print $c "\nRejected\n";
		}
		while(($line = <$c>)&&($authenticated==1)){
			print $line;
			chomp($line);
			if($line eq 'help'){
				show_help();
			}elsif($line eq 'agents'){
				agents_display();
			}elsif($line=~m/details (.*)$/i){
				details_agent($1);
			}elsif($line=~m/add <([a-z0-9]*)> <([a-z0-9]*)> <(.*)>$/i){
				add_agent($1,$2,$3);
			}elsif($line eq 'pending'){
				pending();
			}elsif($line eq 'confirm'){
				print $c "y/n ?\n";
				$confirm = <$c>;
				chomp($confirm);
				if($confirm eq 'y'){
					confirm();
				}
			}
			print $c "\n> ";
		}
		close $c;
		exit;
   }
   exit;
}
close $lis;
close(agents);
close(agentz);