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Old 03-17-2008, 10:26 PM   #1
Registered: Aug 2006
Posts: 50

Rep: Reputation: 15
Interface not working on startup - init.d not running properly?

Twice this past week when I turned on my PC (Debian latest stable build) the internet didn't work.
I ran `ifdown eth1; ifup eth1` and it started working.
(eth0 is Firewire, eth1 ethernet)
Why? How do I fix it?
I'm suspicious that the init.d isn't working properly because I added a script/file to /etc/init.d/ that reads `ntpdate {servers}` and when I booted, my clock was off by a few hours. (`ntpdate {servers}` fixed it.) Unless that's just because I didn't include a shebang and/or path in that script... :innocent:
Old 03-18-2008, 03:08 AM   #2
Registered: Mar 2008
Posts: 53

Rep: Reputation: 15
Have do changed the script permission to executable in init.d
chmod +x <script-name>
sorry if you know already
Old 03-18-2008, 10:35 AM   #3
Registered: Aug 2006
Posts: 50

Original Poster
Rep: Reputation: 15
Yup. I actually use chmod 700. Most the time the interface is up. Except twice it wasn't...
I tried making a script (owned by root) that ran `ifdown eth1 ; ifup eth1` and "set user or group ID on execution (s)" using chmod 6755, but I get: "/sbin/ifdown: failed to open statefile /etc/network/run/ifstate: Permission denied"
Shouldn't it be running as root?
I tried making that file read/write accessable to everyone (chmod 666) but that just caused the next file to give a permission error.
Hm. For now I let anyone run the script with sudo. It works, but I'd prefer if the suid worked and I'd prefer if it worked without.
EDIT: No go. Even with SUID, it failed. With sudo it worked. So I may as well stick to the shell script and sudo.

EDIT: According to Wikipedia:
"Due to the increased likelihood of security flaws, many operating systems ignore the setuid attribute when applied to executable shell scripts."
Is there a work around?

EDIT: Is this safe? I'm thinking of wrapping the ifdown/ifup in a C program and using the system() call. That should be OK, right?

Last edited by yitzle; 03-18-2008 at 11:03 AM.


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