You need to decide whether you are going to use hex characters to represent your data or ascii characters. If you are going to stick with your original code, then you need to be consistent throughout the code and treat the hex data as hex data, e.g., 

#!/usr/bin/perl -w
use strict;
use integer;
use Socket;

my $port = 50000; # Port to bind to
my $FORK = 0;     # Do we fork?

my $match = sprintf "\x05";

my $proto = getprotobyname('tcp');
socket(SERVER, PF_INET, SOCK_STREAM, $proto) or die "socket:$!";
setsockopt(SERVER, SOL_SOCKET, SO_REUSEADDR, pack("l", 1)) or die
"setsockopt: $!";
bind(SERVER, sockaddr_in($port, INADDR_ANY)) or die "bind: $!";
listen(SERVER, SOMAXCONN) or die "listen: $!";

if($FORK)
{
        my $pid = fork();
        die "fork: $!" if $pid < 0;
        exit if $pid;
}

for(;my $paddr=accept(CLIENT, SERVER); close CLIENT) {
        my ($ver,$nm,$methods) = ();
        recv(CLIENT,$ver,1,0);
        recv(CLIENT,$nm,1,0);
        if(($ver eq $match) && $nm)
        {
                my $char=ord($nm);
                print "Okay, getting $char methods\n";
                recv(CLIENT,$methods,$char,0);
                print "Got [$methods]\n";
        }
}

exit;

[download]

Now, when you use the test line of hex chars to send to this server, you get the following results;

helphand@helphand:~> printf "\x05\x041234" | netcat 127.0.0.1 50000

Produces this output...

helphand@helphand:~> perl -w try.pl
Okay, getting 4 methods
Got [1234]

[download]

Scott

In reply to Re^5: Socket troubles by helphand
in thread Socket troubles by bockman

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