09-21-2001
It is not a just a matter of spoofing the sending IP. SMTP is based on TCP which is connection oriented. The exploit most commonly used is when one or more intermediate SMTP relays are used to relay the mail combined with dirty tricks in the SMTP protocol exchange.
I agree with PxT that there are not too many defensible scenarios to send anonymous email or mask the originating machine. The potential for abuse may far outweigh the benefit for good.
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LEARN ABOUT DEBIAN
net::smtp::server::client
Server::Client(3pm) User Contributed Perl Documentation Server::Client(3pm)
NAME
Net::SMTP::Server::Client - Client session handling for Net::SMTP::Server.
SYNOPSIS
use Carp;
use Net::SMTP::Server;
use Net::SMTP::Server::Client;
use Net::SMTP::Server::Relay;
$server = new Net::SMTP::Server('localhost', 25) ||
croak("Unable to handle client connection: $!
");
while($conn = $server->accept()) {
# We can perform all sorts of checks here for spammers, ACLs,
# and other useful stuff to check on a connection.
# Handle the client's connection and spawn off a new parser.
# This can/should be a fork() or a new thread,
# but for simplicity...
my $client = new Net::SMTP::Server::Client($conn) ||
croak("Unable to handle client connection: $!
");
# Process the client. This command will block until
# the connecting client completes the SMTP transaction.
$client->process || next;
# In this simple server, we're just relaying everything
# to a server. If a real server were implemented, you
# could save email to a file, or perform various other
# actions on it here.
my $relay = new Net::SMTP::Server::Relay($client->{FROM},
$client->{TO},
$client->{MSG});
}
DESCRIPTION
The Net::SMTP::Server::Client module implements all the session handling required for a Net::SMTP::Server::Client connection. The above
example demonstrates how to use Net::SMTP::Server::Client with Net::SMTP::Server to handle SMTP connections.
$client = new Net::SMTP::Server::Client($conn)
Net::SMTP::Server::Client accepts one argument that must be a handle to a connection that will be used for communication.
Once you have a new client session, simply call:
$client->process
This processes an SMTP transaction. THIS MAY APPEAR TO HANG -- ESPECIALLY IF THERE IS A LARGE AMOUNT OF DATA BEING SENT. Once this method
returns, the server will have processed an entire SMTP transaction, and is ready to continue.
Once $client->process returns, various fields have been filled in. Those are:
$client->{TO} -- This is an array containing the intended
recipients for this message. There may be
multiple recipients for any given message.
$client->{FROM} -- This is the sender of the given message.
$client->{MSG} -- The actual message data. :)
AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>. ALL RIGHTS
RESERVED.
You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl
README file.
SEE ALSO
Net::SMTP::Server::Server, Net::SMTP::Server::Relay
perl v5.10.1 1999-12-28 Server::Client(3pm)