udhcpc wrapper?

[repvik]

I've been trying to get my own DDNS solution running on Merlin, but have so far not been successful.

When udhcpc recieves a lease, it runs /tmp/udhcpc as "a script" that does some magic. Unfortunately, this "script" isn't a script, it's a binary, and I don't know if the source is available.

Would it be possible to replace /tmp/udhcpc with a wrapper script that can execute a script in /jffs/scripts when a new lease is obtained?
(Or, change udhcpc parameters, the -s parameter, to point to a separate script that later runs the /tmp/udhcpc binary)

Eg. something like this:

#!/bin/sh
if [[ -x "/jffs/scripts/udhcpc-lease" ]]
then
	/jffs/scripts/udhcpc-lease
fi
/tmp/udhcpc $*

Or is there some hook elsewhere that I'm missing?

 

[knighthawk]

Only hook I know of for trapping dhcp-events are those mentioned in

https://github.com/RMerl/asuswrt-merlin/wiki/User-scripts

As I recall there isn't one for the [on-successful lease renewal] per say but "renew" and "bound" may fit your purpose, it may not though as it may get fired regardless of the outcome.


The source for it is available in the git repository.

You may be interested in the information mentioned in the udhcpc readme though I don't know if it's 1000% accurate for current builds but it's a starting point.

 

[repvik]

Only hook I know of for trapping dhcp-events are those mentioned in

https://github.com/RMerl/asuswrt-merlin/wiki/User-scripts

As I recall there isn't one for the [on-successful lease renewal] per say but "renew" and "bound" may fit your purpose, it may not though as it may get fired regardless of the outcome.


The source for it is available in the git repository.

You may be interested in the information mentioned in the udhcpc readme though I don't know if it's 1000% accurate for current builds but it's a starting point.

How did I manage to miss that? The bound event is everything I need, of course. Renew doesn't mean a change in IP, so no change necessary there, and unbound means I don't have network

(The information for udhcpc isn't relevant, since udhcpc is run with the parameter -s that overrides the default script. And there is afaik no way to change that without rebuilding)

Thanks a bunch!