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#!/bin/bash
# Copyright (c) 2004-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Contributed by Roy Marples (uberlord@gentoo.org)
# Fix any potential localisation problems
# Note that LC_ALL trumps LC_anything_else according to locale(7)
tunctl() {
LC_ALL=C /usr/bin/tunctl "$@"
}
# char* tuntap_provides(void)
#
# Returns a string to change module definition for starting up
tuntap_provides() {
echo "tuntap"
}
# void tuntap_depend(void)
#
# Sets up the dependancies for the module
tuntap_depend() {
after interface
before dhcp
}
# bool tuntap_check_installed(void)
#
# Returns 1 if tuntap is installed, otherwise 0
tuntap_check_installed() {
[[ -x /usr/bin/tunctl ]] && return 0
${1:-false} && eerror "For TunTap support, emerge sys-apps/usermode-utilities"
return 1
}
# bool tuntap_check_depends(void)
#
# Checks to see if we have the needed functions
tuntap_check_depends() {
local f
for f in interface_exists interface_type; do
[[ $( type -t "${f}" ) == "function" ]] && continue
eerror "tuntap: missing required function ${f}\n"
return 1
done
return 0
}
# bool tuntap_check_kernel(void)
#
# Checks to see if the tun is present - if not try and load it
# Returns 1 if there is a problem
tuntap_check_kernel() {
[[ -a /dev/net/tun ]] && return 0
/sbin/modprobe tun && sleep 1
[[ -a /dev/net/tun ]] && return 0
eerror "TUN/TAP support is not present in this kernel"
return 1
}
# char* tuntap_get_vars(char *interface)
#
# Returns a string spaced with possible user set
# configuration variables
tuntap_get_vars() {
echo "tunctl_$1"
}
# bool tuntap_exists(char *interface)
#
# Returns 0 if the tun/tap interface exists, otherwise 1
tuntap_exists() {
tunctl -d "$1" &>/dev/null
}
# bool tuntap_pre_start(char *iface)
#
# Create the device, give it the right perms
tuntap_pre_start() {
local iface="$1" opts ifvar=$( bash_variable "$1" )
local itype=$( interface_type "${iface}" )
# Check that we are a valid tun/tap interface
# NOTE - the name can be anything as we define it
# but for simplicity in the config we require either
# tun or tap
[[ ${itype} != "tun" && ${itype} != "tap" ]] && return 0
tuntap_check_kernel || return 1
# Get our options
eval opts=\"\$\{tunctl_${ifvar}\}\"
ebegin "Creating Tun/Tap interface ${iface}"
tunctl ${opts} -t "${iface}" >/dev/null
eend "$?" || return 1
return 0
}
# bool tuntap_stop(char *iface)
#
# Removes the device
tuntap_stop() {
local iface="$1"
tuntap_check_installed || return 0
interface_exists "${iface}" || return 0
# tunctl doesn't always error on on tun/tap
# interfaces (mainly aliases, etc)
if tuntap_exists "${iface}" ; then
interface_exists "${iface}" \
|| einfo "Destroyed Tun/Tap interface ${iface}"
fi
return 0
}
# vim:ts=4
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