Help in writing a C program as a service deamon

cranium2004 · 10-27-2004, 01:23 AM

I want to write a deamon program that will create a random string and send it to its adjecent PC in a LAN?
First i want to know is that possible to send to neighbour PC? Is that require me to know its IP address?
I want to execute this program periodicaaly by 5 minutes and deamon will also store it in a file say /misc/text.txt file
And i want to make it standard service deamon on redhat Linux 9 PC.
how to do it?

blackzone · 10-27-2004, 02:21 AM

I'm not sure what you mean by adjacent PC

if you want to send it to every PC in the LAN you can send it through the broadcast IP

type "ifconfig" and it'll show the Bcast(braodcast IP)

jlliagre · 10-27-2004, 02:44 AM

For your daemon to be able to send sth to its neighbours over the LAN, you first need to have a service ready to listening to it in each target hosts, preferably a service on UDP to allow broadcasts.

cranium2004 · 10-27-2004, 03:11 AM

how to write own service? is that mean my socket program then how to make it as a listening service?

Hko · 10-27-2004, 07:40 AM

Quote:

Originally posted by cranium2004
how to write own service? is that mean my socket program then how to make it as a listening service?

Call daemon(0,0) at the start of your program and open a listening socket.

jlliagre · 10-27-2004, 12:09 PM

cranium2004, perhaps can you (re)use an already existing service on the target hosts.
What do you want them to do with your random string ?

cranium2004 · 10-28-2004, 12:48 AM

hello jilliagre,
its part of my project

jlliagre · 10-28-2004, 03:14 AM

I've no doubt it's part of your project, but that doesn't answer my question ...

cranium2004 · 10-28-2004, 03:52 AM

heres the ans to ur question
i want to make 2 pcs routers and want those routers to exchange some random string for authentications to each others packet. this is short ans to ur question otherwise i have a full description of my project in big doc file.

jlliagre · 10-28-2004, 07:31 AM

Thanks for the explanation, and please no big .doc file !!!
An easy way to achieve that would be to send the strings with ftp, nfs or better scp, as I suppose security is a concern here.