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UDP Broadcast Packet Relay
==========================
This program listens for packets on a specified UDP broadcast port. When
a packet is received, it sends that packet to all specified interfaces
but the one it came from as though it originated from the original
sender.
The primary purpose of this is to allow games on machines on separated
local networks (Ethernet, WLAN) that use udp broadcasts to find each
other to do so.
It also works on ppp links, so you can log in from windows boxes (e.g.
using pptp) and play LAN-based games together. Currently, you have to
care about upcoming or downgoing interfaces yourself.
INSTALL
-------
make
cp udp-broadcast-relay /some/where
USAGE
-----
/some/where/udp-broadcast-relay id udp-port eth0 eth1...
udp-broadcast-relay must be run as root to be able to create a raw
socket (necessary) to send packets as though they originated from the
original sender.
COMPATIBILITY
-------------
- I run debian woody with Linux 2.4.20, and here it works.
EXAMPLE
-------
/some/where/udp-broadcast-relay -f 1 6112 eth0 eth1 # forward Warcraft 3 broadcast packets
CONTRIBUTORS
-----------------
Over the last years, various people submitted code to the project. Note that I
do not use udp-broadcast-relay any more myself, so these changes were not
tested by me.
- Patrick Huesmann submitted a patch to make udp-broadcast-relay send
the packes to those NICs it did not recieve it from, based on the
actual socket, not the broadcast IP. This is useful if more than one
physical networks share the same broadcast range.
- Савченко В. М. submitted an `ip-up.local` an `ip-down.local` file to
automatically restart udp-broadcast-relay when new ppp-interfaces
come up, see `ppp-if.up-local` for details.
- Roman Hoog Antink contributed the option `-s` to spoof the source IP of
forwarded packages.
Thanks to all contributors!
BUGS/CRITICISM/PATCHES/ETC
--------------------------
- Web: <http://www.joachim-breitner.de/udp-broadcast-relay/>
- e-mail: Joachim Breitner <<mail@joachim-breitner.de>>
- Github: <https://github.com/nomeata/udp-broadcast-relay/>
HISTORY
-------
* 0.3 2003-09-28
Sending packets also to ppp addresses
* 0.2 2003-09-18
Flags for debugging and forking, Compilefixes, Makefile-Target
"clean"
* 0.1 2003-09-15
Initial rewrite of udp_broadcast_fw
CREDITS
-------
This is based upon [udp_broadcast_fw](http://www.serverquery.com/udp_broadcast_fw/) by Nathan O'Sullivan.
HISTORY of udp_broadcast_fw
---------------------------
* 0.1.1 - 19 Feb 02
Moved fork() code to just before main loop so that errors would
appear
* 0.1 - 18 Feb 02
Initial release
LICENSE
-------
This code is made available under the GPL. Read the COPYING file inside
the archive for more info.
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