Monks, I have a bug, and need some assistance correcting it. Here's what I'm trying to do. client sends a variable length message to server (encrypted) server reads message, does Stuff (tm) to with it and responds via the same socket. My problems is that occasionally (1/3ish of the time) the message from the client is truncated. Here are the relevant code bits:

CLIENT: 

use Socket qw(:DEFAULT :crlf);
use IO::Handle;


my ($remote, $iaddr, $paddr, $proto, $line, $response);
    
$remote  = $client || 'localhost';
$port    = $port || 8086;  # random port
if ($port =~ m/\D/) { $port = getservbyname($port, 'tcp') }
die "Bad port" unless $port;
$iaddr   = inet_aton($remote) or die "can't connect: $remote";
$paddr   = sockaddr_in($port, $iaddr);
    
$proto   = getprotobyname('tcp');
socket(SOCK, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";
connect(SOCK, $paddr) or die "connect: $!";
    
SOCK->autoflush(1);

print SOCK $encrypted_message . CRLF;

[download]

SERVER: 

use Socket qw(:DEFAULT :crlf);
use IO::Handle;

next unless my $rem_addr = accept(SESSION,SOCK);
my ($r_port,$r_addr) = sockaddr_in($rem_addr);
warn "Connection from [", inet_ntoa($r_addr),",$r_port]\n";

SESSION->autoflush(1);
my $incoming = '';
my $line = '';
while( defined($line = <SESSION>))
{
    $incoming .= $line;
    last if $incoming =~ /\n$/; # vain attempt to find end of line
}

chomp $incoming;
my $msg = decrypt($key, $incoming);

[download]
and so on . . I can't seem to reliably detect the end of the message. Any advice would be greatly appreciated.

-anelson

In reply to Socket IO problems by anelson

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