=head1 NAME

udpdump - Provide an UDP receiver that gets packets from network devices (like Aruba routers) and exports them in PCAP format.

=head1 SYNOPSIS

B<udpdump>
S<[ B<--help> ]>
S<[ B<--version> ]>
S<[ B<--extcap-interfaces> ]>
S<[ B<--extcap-dlts> ]>
S<[ B<--extcap-interface>=E<lt>interfaceE<gt> ]>
S<[ B<--extcap-config> ]>
S<[ B<--capture> ]>
S<[ B<--fifo>=E<lt>path to file or pipeE<gt> ]>
S<[ B<--port>=E<lt>portE<gt> ]>
S<[ B<--payload>=E<lt>typeE<gt> ]>

=head1 DESCRIPTION

B<udpdump> is a extcap tool that provides an UDP receiver that listens for exported datagrams coming from
any source (like Aruba routers) and exports them in PCAP format. This provides the user two basic
functionalities: the first one is to have a listener that prevents the localhost to send back an ICMP
port-unreachable packet. The second one is to strip out the lower layers (layer 2, IP, UDP) that are useless
(are used just as export vector). The format of the exported datagrams are EXPORTED_PDU, as specified in
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob;f=epan/exported_pdu.h;hb=refs/heads/master

=head1 OPTIONS

=over 4

=item --help

Print program arguments.

=item --version

Print program version.

=item --extcap-interfaces

List available interfaces.

=item --extcap-interface=E<lt>interfaceE<gt>

Use specified interfaces.

=item --extcap-dlts

List DLTs of specified interface.

=item --extcap-config

List configuration options of specified interface.

=item --capture

Start capturing from specified interface save saved it in place specified by --fifo.

=item --fifo=E<lt>path to file or pipeE<gt>

Save captured packet to file or send it through pipe.

=item --port=E<lt>portE<gt>

Set the listerner port. Port 5555 is the default.

=item --payload=E<lt>typeE<gt>

Set the payload of the exported PDU. Default: data.

=back

=head1 EXAMPLES

To see program arguments:

    udpdump --help

To see program version:

    udpdump --version

To see interfaces:

    udpdump --extcap-interfaces

  Example output:
    interface {value=udpdump}{display=UDP Listener remote capture}

To see interface DLTs:

    udpdump --extcap-interface=udpdump --extcap-dlts

  Example output:
    dlt {number=252}{name=udpdump}{display=Exported PDUs}

To see interface configuration options:

    udpdump --extcap-interface=udpdump --extcap-config

  Example output:
    arg {number=0}{call=--port}{display=Listen port}{type=unsigned}{range=1,65535}{default=5555}{tooltip=The port the receiver listens on}

To capture:

    udpdump --extcap-interface=randpkt --fifo=/tmp/randpkt.pcapng --capture

NOTE: To stop capturing CTRL+C/kill/terminate application.

=head1 SEE ALSO

wireshark(1), tshark(1), dumpcap(1), extcap(4)

=head1 NOTES

B<udpdump> is part of the B<Wireshark> distribution.  The latest version
of B<Wireshark> can be found at L<https://www.wireshark.org>.

HTML versions of the Wireshark project man pages are available at:
L<https://www.wireshark.org/docs/man-pages>.

=head1 AUTHORS

  Original Author
  ---------------
  Dario Lombardo             <lomato[AT]gmail.com>