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tinc/redhat/tinc
Ivo Timmermans 1c8adb5e1f Merge changes from 1.6-1.8.
2000-06-17 20:30:44 +00:00

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#!/bin/sh
#
# tinc tincd VPN setup script
#
# chkconfig: 2345 46 54
#
# version: 1.0.8
# authors: Lubomir Bulej <pallas@kadan.cz>
# Mads Kiilerich <mads@kiilerich.com>
#
# description: This script parses tinc configuration files for networks given \
# in /etc/tinc/nets.boot and for each of the networks it sets up \
# the interface and static routes and starts the tinc daemon.
#
# processname: tincd
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
#############################################################################
# configuration & sanity checks
TINCD=/usr/sbin/tincd
TCONF=/etc/tinc
TPIDS=/var/run
#DEBUG=-dddd
NETSFILE=$TCONF/nets.boot
# Check the daemon
if [ ! -x $TINCD ]; then
echo "**tinc: $TINCD does not exist or is not executable!" >&2
exit
fi
# Check if ip-route is installed
if [ ! -f /sbin/ip ]; then
echo "**tinc: ip-route utilities not installed!" >&2
exit
fi
# Check the kernel
if ! ip addr &> /dev/null; then
echo "**tinc: kernel not configured for use with ip-route!" >&2
exit
fi
# Check the configuration directory
if [ ! -d $TCONF ]; then
echo "**tinc: configuration directory ($TCONF) not found!" >&2
exit
fi
# Check nets.boot
if [ ! -f $NETSFILE ]; then
echo "**tinc: file with list of VPNs to start ($NETSFILE) not found!" >&2
exit
fi
# Load names of networks to be started
NETS="$(sed -e 's/#.*//; s/[[:space:]]//g; /^$/ d' $NETSFILE)"
##############################################################################
# prefix_to_mask Converts prefix length to netmask
# eg. 17 -> 255.255.128.0
# $1 ... prefix
prefix_to_mask () {
_MSK=""; _len="$1"
for _dot in "." "." "." " "; do
if [ ${_len} -ge 8 ]; then
_fld=8
else
_fld="${_len}"
fi
_MSK="${_MSK}$((255 & (255 << (8 - _fld))))${_dot}"
_len=$((_len - _fld))
done
echo ${_MSK}
}
##############################################################################
# mask_to_prefix Converts netmask to prefix length
# eg. 255.255.192.0 -> 18
# $1 ... netmask
mask_to_prefix () {
_LEN=0; _msk="$1"
for _tmp in 1 2 3 4; do
_fld=${_msk%%.*}
_msk=${_msk#*.}
while [ ${_fld} -ne 0 ]; do
_fld=$(((_fld << 1) & 255))
_LEN=$((_LEN + 1))
done
done
echo ${_LEN}
}
##############################################################################
# vpn_load () Loads VPN configuration
#
# $1 ... VPN to load
vpn_load () {
CFG="$TCONF/$1/tinc.conf"
[ -f $CFG ] || { MSG="$CFG does not exist!"; return 1; }
# load TINCD config
DEV="$(grep -i -e '^[[:space:]]*TapDevice' $CFG | sed 's/[[:space:]]//g; s/^.*=//g')"
VPN="$(grep -i -e '^[[:space:]]*(MyOwnVPNIP|MyVirtualIP)' -E $CFG | sed 's/[[:space:]]//g; s/^.*=//g')"
IFM="$(grep -i -e '^[[:space:]]*VPNMask' $CFG | sed 's/[[:space:]]//g; s/^.*=//g')"
# TapDevice syntax validation
[ -z "$DEV" ] && \
{ MSG="TapDevice required!"; return 1; }
[ $(echo $DEV | wc -l) -gt 1 ] && \
{ MSG="multiple TapDevice entries not allowed!"; return 1; }
echo $DEV | grep -q -x -E '/dev/tap[[:digit:]]+' ||
{ MSG="TapDevice should be in form /dev/tapX!"; return 1; }
# MyOwnVPNIP/MyVirtualIP syntax validation
[ -z "$VPN" ] && \
{ MSG="MyOwnVPNIP/MyVirtualIP required!"; return 1; }
[ $(echo $VPN | wc -l) -gt 1 ] && \
{ MSG="multiple MyOwnVPNIP/MyVirtualIP entries not allowed!"; return 1; }
echo $VPN | grep -q -x -E \
'([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}/[[:digit:]]{1,2}' || \
{ MSG="badly formed MyOwnVPNIP/MyVirtualIP address $VPN!"; return 1; }
# VPNMask syntax validation
[ $(echo $IFM | wc -l) -gt 1 ] && \
{ MSG="multiple VPNMask entries not allowed!"; return 1; }
# device & IP address extraction
TAP=${DEV##*/}
NUM=${TAP#tap}
ADR=${VPN%%/*}
# netmask is calculated from MyVirtualIP netmask prefix length, except when
# VPNMask is specified, in which case it is used instead of default prefix
# VPNMask not specified
if [ -z "$IFM" ]; then
LEN=${VPN##*/}
MSK=$(prefix_to_mask $LEN)
# VPNMask is prefix length, convert it to netmask for MSK
elif echo $IFM | grep -q -x -E '[[:digit:]]{1,2}'; then
VPN="$ADR/$IFM"
MSK=$(prefix_to_mask $IFM)
# VPNMask is netmask, convert it to prefix length for VPN
elif echo $IFM | grep -q -x -E '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}'; then
VPN="$ADR/$(mask_to_prefix $IFM)"
MSK="$IFM"
else
MSG="badly formed interface netmask (VPNMask=$IFM)!"
return 1
fi
# Network & broadcast addresses
BRD=$(ipcalc --broadcast $ADR $MSK | cut -d"=" -f2)
NET=$(ipcalc --network $ADR $MSK | cut -d"=" -f2)
# MAC address
MAC=$(printf "fe:fd:%0.2x:%0.2x:%0.2x:%0.2x" $(echo $ADR | { IFS=. ; read a b c d; echo $a $b $c $d; }))
# debugging
# echo >&2
# echo "VPN $VPN TAP $TAP NUM $NUM MAC $MAC IFM $IFM" >&2
# echo "ADR $ADR MSK $MSK NET $NET BRD $BRD" >&2
return 0
}
##############################################################################
# vpn_start () starts specified VPN
#
# $1 ... VPN to start
vpn_start () {
MSG=""; ERR=""
vpn_load $1 || return 1
# create device file
if [ ! -c $DEV ]; then
[ -e $DEV ] && rm -f $DEV
mknod --mode=0600 $DEV c 36 $((16 + NUM))
fi
# load device module
ERR="$(insmod ethertap -o "ethertap$NUM" unit="$NUM" 2>&1 1> /dev/null)" ||
{ MSG="could not insmod ethertap as unit $NUM!"; return 2; }
# configure the interface
ERR="$(ip link set $TAP address $MAC 2>&1)" ||
{ MSG="could not set address for device $TAP!"; return 3; }
ERR="$(ip link set $TAP up 2>&1)" ||
{ MSG="could not bring up device $TAP!"; return 3; }
ERR="$(ip addr add $VPN brd $BRD dev $TAP 2>&1)" ||
{ MSG="could not set IP address for device $TAP!"; return 3; }
# start tincd
$TINCD --net="$1" $DEBUG || \
{ MSG="could not start daemon for network $1"; return 3; }
# setup custom static routes
/etc/sysconfig/network-scripts/ifup-routes $TAP
return 0
} # vpn_start
##############################################################################
# vpn_stop () Stops specified VPN
#
# $1 ... VPN to stop
vpn_stop () {
MSG=""; ERR=""
vpn_load $1 || return 1
# kill the tincd daemon
PID="$TPIDS/tinc.$1.pid"
if [ -f $PID ]; then
$TINCD --net="$1" --kill &> /dev/null
RET=$?
if [ $RET -eq 0 ]; then
dly=0
while [ $dly -le 5 ]; do
[ -f $PID ] || break
sleep 1; dly=$((dly + 1))
done
fi
# remove stale PID file
[ -f $PID ] && rm -f $PID
fi
# bring the interface down
ip addr flush dev $TAP &> /dev/null
ip link set $TAP down &> /dev/null
# remove ethertap module
rmmod "ethertap$NUM" &> /dev/null
return 0
} # vpn_stop
# Check if there is anything to start
if [ ! -z "$1" -a "$1" != "status" -a -z "$NETS" ]; then
echo "**tinc: no networks found in $NETSFILE!" >&2
exit
fi
# See how we were called.
case "$1" in
start)
for vpn in $NETS; do
echo -n "Bringing up TINC network $vpn: "
vpn_start $vpn && \
success "startup of network $vpn" || \
failure "startup of network $vpn"
echo
if [ ! -z "$MSG" ]; then
[ ! -z "$ERR" ] && echo "$ERR" >&2
echo "**tinc: $MSG" >&2
fi
done
touch /var/lock/subsys/tinc
;;
stop)
for vpn in $NETS; do
echo -n "Shutting down TINC network $vpn: "
vpn_stop $vpn && \
success "shutdown of network $vpn" || \
failure "shutdown of network $vpn"
echo
if [ ! -z "$MSG" ]; then
[ ! -z "$ERR" ] && echo "$ERR" >&2
echo "**tinc: $MSG" >&2
fi
done
rm -f /var/lock/subsys/tinc
;;
status)
echo -n "Configured VPNs: "
for vpn in $NETS; do
PID="$TPIDS/tinc.$vpn.pid"
[ -f $PID ] && PID="$(cat $PID)" || PID="-dead-"
ps ax | grep "^[[:space:]]*$PID" && STS="OK" || STS="DEAD"
echo -n "$vpn:$STS "
done
echo
;;
restart)
$0 stop
$0 start
;;
*)
echo "Usage: tinc {start|stop|status|restart}"
exit 1
esac
exit 0
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