Bug 32673

Summary:	/dev/net/tun is created as a regular file if missing
Product:	Sisyphus	Reporter:	Ivan Zakharyaschev <imz>
Component:	vpnc-script	Assignee:	Alexey Shabalin <shaba>
Status:	NEW ---	QA Contact:	qa-sisyphus
Severity:	minor
Priority:	P3	CC:	shaba
Version:	unstable
Hardware:	all
OS:	Linux

Description Ivan Zakharyaschev 2016-10-27 14:43:27 MSK

vpnc-script-0.5.3-alt6

In a system without systemd (and without any preceding "modprobe tun"), openconnect (which must be using vpnc-script):

* would fail with unclear errors like this:

	ioctl(5, TUNSETIFF, 0x7fffbc71f7d0) = -1 ENOTTY (Inappropriate ioctl for device)

* and would have created /dev/net/tun as a regular file like this:

	open("/dev/net/tun", O_RDWR|O_CREAT, 0666) = 3

(which would prevent the creation of a correct device afterwards).

A similar case (probably, the same bug) has been reported as a Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780709

Work-around:

rm /dev/net/tun # if it's a wrong regular file
modprobe -r tun
modprobe tun