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= udpdump(1)
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== NAME

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

== SYNOPSIS

[manarg]
*udpdump*
[ *--help* ]
[ *--version* ]
[ *--extcap-interfaces* ]
[ *--extcap-dlts* ]
[ *--extcap-interface*=<interface> ]
[ *--extcap-config* ]
[ *--capture* ]
[ *--fifo*=<path to file or pipe> ]
[ *--port*=<port> ]
[ *--payload*=<type> ]

== DESCRIPTION

*udpdump* is a extcap tool that provides a 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://gitlab.com/wireshark/wireshark/-/raw/master/epan/exported_pdu.h

== OPTIONS

--help::
Print program arguments.

--version::
Print program version.

--extcap-interfaces::
List available interfaces.

--extcap-interface=<interface>::
Use specified interfaces.

--extcap-dlts::
List DLTs of specified interface.

--extcap-config::
List configuration options of specified interface.

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

--fifo=<path to file or pipe>::
Save captured packet to file or send it through pipe.

--port=<port>::
Set the listener port. Port 5555 is the default.

--payload=<type>::
Set the payload of the exported PDU. Default: data.

== 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 the application.

== SEE ALSO

xref:wireshark.html[wireshark](1), xref:tshark.html[tshark](1), xref:dumpcap.html[dumpcap](1), xref:extcap.html[extcap](4)

== NOTES

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

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

== AUTHORS

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