I'm pretty new to Perl network programming, so I'm sure I may have a bunch of stuff wrong. This is just a simple client/server communication, but the server doesn't seem to receive the messages until the client closes the connection (or quits). I expected it to get the data and process it line by line.

Client code:

$proto = getprotobyname("tcp");
$iaddr = inet_aton($host) or
    die "Invalid host : $!\n";
$paddr = sockaddr_in($port,$iaddr);

socket(SOCKET,PF_INET,SOCK_STREAM,$proto) or
    die "socket: $!\n";

connect(SOCKET,$paddr) or
    die "connect: $!\n";

print "connected\n";

print SOCKET "HELLO\n";
print SOCKET "END\n";
print "finished sending\n";


while (chomp($line = <SOCKET>))
{
    print $line;
    if ($line eq "END")
    {
        print SOCKET "received $line\n";
        print SOCKET "END";
    }
}

close SOCKET or die "close: $!";
[download]

Server Code:

$protocol = getprotobyname("tcp");
socket(SOCK,PF_INET,SOCK_STREAM,$protocol) or
    die "socket: $!\n";
setsockopt(SOCK,SOL_SOCKET,SO_REUSEADDR,1) or
    die "setsockopt: $!\n";

$paddr = sockaddr_in($port, INADDR_ANY);

bind(SOCK, $paddr) or
    die "bind: $!\n";
listen(SOCK,SOMAXCONN) or
    die "listen: $!\n";

print "Server started on port $port.\n";

while ($client_addr = accept(CLIENT,SOCK))
{
    my ($client_port,$client_ip) = sockaddr_in($client_addr);
    $client_ipnum = inet_ntoa($client_ip);
    $client_host = gethostbyaddr($client_ip,AF_INET);
    
    print "$client_host connected from ip $client_ipnum\n";

readagain:
    while (chomp($line = <CLIENT>))
    {
        print "From client: $line\n";
        if ($line eq "END")
        {
            goto inputfromuser;
        }
    }
inputfromuser:
    
    print "Input > ";
    chomp($input = <>);
    print CLIENT "$input\n";
goto readagain;
    
    print CLIENT "Test message :)\n";
    #print CLIENT "\0";
    
    print "Out of loop\n";
}

print "Closing connection.\n";
close CLIENT;
[download]

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