Fellow Monks,
I've been investigating ways to bypass routing tables using perl sockets. Much in the way Ping can do this. I've found this is possible using setsocketopt syntax with Socket.pm, But when using IO::Socket it only seems to work for one type of device. For example.

Using Socket.pm this syntax works with ethernet and PPP devices
use Socket qw( SOCK_DGRAM SOCK_STREAM SOCK_RAW PF_INET SOL_SOCKET inet
+_aton inet_ntoa sockaddr_in );

$host="www.cnet.com";
$port="80";

socket(SOCK, PF_INET, SOCK_STREAM, getprotobyname('tcp'));
setsockopt(SOCK, SOL_SOCKET, 25 , pack("Z*","eth0")) || die "error\n";
$iaddr = inet_aton($host);
$paddr = sockaddr_in($port, $iaddr);
connect(SOCK, $paddr);

[download]
The code which, from what i can tell for IO::Socket looks like this
use IO::Socket;

$server = $ARGV[0];
$port = 80;

$socket = IO::Socket::INET->new(
Proto => 'tcp',
PeerAddr => $server,
PeerPort => $port,
Timeout => 10,
);
unless($socket) {
die("Could not connect to $server:$port");
}
$socket->autoflush(1);
$socket->sockopt(25, "eth0") || die "error\n";

[download]
And this works with ethernet device but NOT PPP.

when i strace it, it hangs after printing to the socket.
I've also tried packing the device like above but it seems to make little difference, the sockopt returns true and hangs.

any ideas?

In reply to Socket, IO::Socket and SO_BINDTODEVICE by jaco

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