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my ($port) = (4000); my $socket = IO::Socket::INET->new( LocalPort => $port, Listen => 5, Reuse => 1 ); die "Can't create server socket: $!" unless $socket; print "Listening for connections on port $port\n"; my $readable = IO::Select->new; $readable->add($socket); while(1) { my ($ready) = IO::Select->select($readable, undef, undef, undef); foreach my $s (@$ready) { if($s == $socket) { my $new_sock = $socket->accept; $readable->add($new_sock) if $new_sock; print $new_sock "Status server online!\r\n"; print STDERR ("Accepted connection from: ", join('', (unpack('C*',$new_sock->peername))[47]), "\n"); } else { my $buf = <$s>;

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 class MotorVehicle { protected int doStuff(int x) { return x * 2; } } class Bicycle { void go(MotorVehicle m) { Systemoutprint(mdoStuff(21) + " "); } } public class Beemer extends MotorVehicle { public static void main(String[] args) { Systemoutprint(new Beemer()doStuff(11) + " "); new Bicycle()go(new Beemer()); new Bicycle()go(new MotorVehicle()); } int doStuff(int x) { return x * 3; } }

12:

if( defined $buf ) { if ($buf =~ /exit/i) { print $s "Bye!\n"; $readable->remove($s); $s->close; } elsif ($buf =~ /status/i) { my $uptime = `/usr/bin/uptime`; print $s scalar localtime(time()), ': ',$uptime; } } else { $readable->remove($s); $s->close; print STDERR "Client Connection closed\n"; } } } }

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When connecting with a remote socket, you might take it for granted that you know the remote IP address of the machine you are talking to In fact, you can t necessarily guarantee it s the one you expect It s possible for a single name to resolve to a number of IP addresses, and the exact one you have connected to may not be obvious When you are running a script for use as a server, the same problem occurs if you forget to use the IP address returned by the accept function In both cases, you can use the getpeername function to return the IP address of the remote machine you are talking to:

The function returns the packed sockaddr_in structure of the remote socket connection You ll need to extract the real address with something like this:

What is the result (Choose all that apply) A 22 42 42 B 22 63 63 C 33 42 42 D 33 63 42 E F Compilation fails An exception is thrown at runtime

print "Remote: ",inet_ntoa((unpack_sockaddr_in(getpeername SOCKET))[1]),"\n";

The opposite is true when a script is acting as a server If you specified one of the wildcard addresses, such as INADDR_ANY, as the address to bind to, then you may not know what you have bound to on a multiple-interface host You can find out that information with getsockname:

This returns the same information as getpeername, except that it s for the local machine, rather than the remote one Note that in both cases, the functions only work on open and connected sockets You can t create a socket and bind it or connect to it in order to get the current IP address of the local or remote machine Until a connection has been accepted or connected, the socket is not attached to any local or remote IP address

Answer (for Objective 53): E is correct BeemerdoStuff() will not compile because it s attempting to override using a weaker access modifier A, B, C, D, and F are incorrect based on the above

Because Perl treats a socket just like any other filehandle, the obvious (and natural) way to close a socket is to use the close function However, you can use the shutdown function to provide a controlled shutdown of a connected socket

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