extcap: add udpdump.

Udpdump is a generic UDP receiver that exports datagram in PCAP format.

Change-Id: I52620a92b12530b6f9b5449c43e692663acdfc14
Reviewed-on: https://code.wireshark.org/review/17195
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Roland Knall <rknall@gmail.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/doc/udpdump.pod b/doc/udpdump.pod
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+++ b/doc/udpdump.pod
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+
+=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>