in reply to Re: udp broadcast: doesn't work in Linux
in thread udp broadcast: doesn't work in Linux

thanks cjensen!
I added the following just below the socket creation and above the send method: 
print "\ngetpeername: " . getpeername($sock) . "\n";

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output is: 
getpeername: 
send: Cannot determine peer address at udp.pl line 26

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so, no error when calling getpeername...
checking the linux kernel road.. woulb be very strange if you cannot send something to a LAN broadcast address
tried other port values... nothing (port is random)
F.

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Re: Re: Re: udp broadcast: doesn't work in Linux
by cjensen (Sexton) on Oct 12, 2001 at 00:39 UTC
    I should have been more clear... The error is occurring when the peer name is undefined in IO::Socket. It won't give you an error when it can't determine the peer address, it just returns undef. Then the call to send in IO::Socket croaks when peer name is undefined:

        croak 'send: Cannot determine peer address'
         unless($peer);
    So getpeername($sock) returning undef is what I expected would happen, I just didn't explain that well enough. It should return the address of the peer at the remote end of the socket.

    Try this and vary the $bcaddr in your script:

    my ($port, $addr) = unpack_sockaddr_in(getpeername($sock));
my $host = gethostbyaddr($addr, AF_INET);
print "Host:\t$host\n";
print "Port:\t$port\n";


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