How to create a DAEMON

SlacUser · 04-25-2007, 12:08 PM

Hi, I need to create a daemon and I don't know how. I want to implement the RIP protocol, to connect my ubuntu distribution with a router, so I need to convert this protocol into a daemon. Any help?

Thanks in advance

GrapefruiTgirl · 04-25-2007, 12:20 PM

Code:

while true;
do
... code goes here
.... blah blah.. echo "hi Im a daemon" > /var/log/daemon.log
.. blah more code..
done

There's definitely another more (correct) way to make an actual daemon, but this is the easy way. It's an infinite loop to do the stuff you need done, and when started with an '&' symbol, the shell will fork it into the background like a daemon.
Eg:

Code:

 /etc/rc.d/rc.daeomn &

hashash · 04-25-2007, 12:32 PM

though you better take care not to overdo stuff in the while.
Remember.. it runs 'all' the time.

Maybe add a delay or hook into the fam if you have one running (<rolls his eyes>) or wait
for some trigger depending on your application.

GrapefruiTgirl · 04-25-2007, 12:33 PM

Good point.. In my own daemon I made, I put a 'sleep 10' in the beginning, so the thing only looped every 10 seconds and then slept again.. In any event, the resource usage is undetectable.

TrAffIkK0 · 04-26-2007, 03:41 AM

I'm a total n00b in linux, so I don't understand what you did. I saw in other forums and some documents about a daemon called routed that manage RIP and I would like to know how to implement that.

Could you give a step by step answer? Thank you.

I need to make a router in linux with DHCP, DNS, NAT, FIREWALL and dynamic routing. DHCP, DNS, NAT and the FIREWALL it's already working, but the medular problem now it's the dynamic routing. I hope you could give me an step by step answer.

GrapefruiTgirl · 04-26-2007, 06:05 AM

Yikes

TraFFikko: Well, what you need as far as I know, is a firewall capable of dynamically altering the IPtables/IPchains on the fly. Doing this is well beyond my abilities, but you will get *some* information from Googling, and I'm sure there are other related threads here on LQ.
Don't quote me, but something like Guarddog or Smoothwall *might* be along the lines of what you seek.
Sorry I can't help on this subject, but there are some very able people around here and hopefully one or more of them will pick up on this and be able to offer some good advice.

Best of luck!
P.S. - You would do well to post in the Networking forum.

TrAffIkK0 · 04-26-2007, 06:08 PM

Thank you grapefuitgirl I'll check that