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On Tue, 4 Oct 2005, /dev/rob0 wrote:
> On Monday 2005-October-03 23:57 UTC, I wrote:
> > I am seeking a scripted means of detecting the tun interface which is
> > associated with a particular openvpn instance. I can easily identify
>
> Perhaps it will be clearer if I discuss The Ultimate Goal.
>
> I want to have a command-line tool to verify the connectivity of any
> particular openvpn peer tunnel.
>
> I already use a script ... "vpn VPNNAME [start|stop|status]", like a
> SysVinit-style init script. The "status" command returns the PID. I
> want to extend it to test and report whether or not the peer is
> reachable. The PID merely means that this end of the tunnel is up.
>
> > the PID's of all openvpn ... pidof(8) (killall5). But I have not yet
> > found a simple way to identify which tun (or perhaps even tap,
> > although I only use --dev tun) that PID is using.
> >
> > I've been looking at lsof(1) and netstat(8), as well as poking around
> > the /proc tree. This is Linux, but I would prefer something portable,
> > if that's possible. Linux /proc/$PID/fd/{3,4} ?
>
> File descriptors 3 and 4 are symbolic links to sockets identified by
> number. I don't know what the numbers mean. There's nothing there to
> suggest that my tun0 VPN is using tun0. File descriptor 5 is a symlink
> to /dev/net/tun.
>
> > I know I can get the IP addresses from the interfaces and the config
> > filename from /proc/$PID/cmdline, then look up the IP from the file,
> > but that's ugly. Am I missing something simple? Thanks.
>
> A less ugly idea is to write a status file along with (or appended to?)
> the PIDfile. That will work for me, but won't be useful for others.
>
> It just seems odd that there's no way to determine the association
> between a tun/tap interface and the userspace program it is working
> with. I bet there is, it's just beyond my skill level to find it.
Why don't you just write an --up script which takes the environmental
variable corresponding to the tun/tap interface ($dev) and writes it to a
file? (see the man page)
James
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