Re: Client Server

[AppleFritter]

You can turn the $client_addr received from accept into a human-readable IP address using unpack_sockaddr_in and inet_ntoa (and then echo that back to the client, as sn1987a described in Re: Client Server). That said, Socket is a fairly low-level module; are you sure you don't want something else instead, say IO::Socket?

For instance, here's the server:

#!/usr/bin/perl

use warnings;
use strict;
use IO::Socket;
use Socket;

# use port 7890 as default
my $port = shift || 7890;

my $socket = IO::Socket::INET->new(
   LocalPort    => $port,
   Type         => SOCK_STREAM,
   Reuse        => 1,
   Listen       => 10,
)
   or die "Couldn't create server: $@\n";

while (my $client = $socket->accept()) {
   my ($port, $iaddr) = unpack_sockaddr_in($client->peername());
   $client->send(inet_ntoa($iaddr));
   $client->close();
}

And here's the client:

#!/usr/bin/perl

use feature qw/say/;
use warnings;
use strict;
use IO::Socket;

# initialize host and port
my $port = shift || 7890;
my $server = "localhost";  # Host IP running the server

my $socket = IO::Socket::INET->new(
    PeerAddr    => $server,
    PeerPort    => $port,
    Proto       => "tcp",
    Type        => SOCK_STREAM
)
    or die "Can't connect to server: $@\n";

while(<$socket>) {
    say;
}

close $socket or die "Can't close socket: $!";

Credit where credit is due: all this is pretty much directly copied from The Perl Cookbook, specifically Recipes 17.1 ("Writing a TCP Client"), 17.2 ("Writing a TCP Server") and 17.7 ("Identifying the Other End of a Socket". I really recommend that book, it's very handy.

[Anonymous Monk]

Yep, that did it. Thank you!

[TheVend]

Im trying to write the value of the connected IP to the server drive. I have the file handle set but how to I quantify the IP as a var to pass it to the file handle?

[AppleFritter]

I'm not quite sure what you mean. Could you clarify?

Suppose that you've got the IP address, as returned by inet_ntoa, saved in a variable (say $ip_address), and suppose that you've got a filehandle for a logfile that's opened for writing (say $logfile_handle), then you can just do this (adding a timestamp as well for good measure):

...
my $ip_address = inet_ntoa($iaddr);
...
say $logfile_handle scalar localtime, " Connection from: $ip_address";
...

Integrating this into the above server example should be straightforward.

[Anonymous Monk]

This is what I needed I wasn't sure how to qualify the IP as a variable this did the trick.

my $ip_address = inet_ntoa($iaddr);