#!/bin/sh
#
# Originally part of vpnc source code:
# © 2005-2012 Maurice Massar, Jörg Mayer, Antonio Borneo et al.
# © 2009-2022 David Woodhouse <dwmw2@infradead.org>, Daniel Lenski <dlenski@gmail.com> et al.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
################
#
# List of parameters passed through environment
#* reason -- why this script was called, one of: pre-init connect disconnect reconnect attempt-reconnect
#* VPNGATEWAY -- VPN gateway address (always present)
#* VPNPID -- PID of the process controlling the VPN (OpenConnect v9.0+)
#* TUNDEV -- tunnel device (always present)
#* IDLE_TIMEOUT -- gateway's idle timeout in seconds (OpenConnect v8.06+); unused
#* LOG_LEVEL -- log level; ERROR=0, INFO=1, DEBUG=2, TRACE=3 (OpenConnect v9.0+)
#* INTERNAL_IP4_ADDRESS -- address (always present)
#* INTERNAL_IP4_MTU -- MTU (often unset)
#* INTERNAL_IP4_NETMASK -- netmask (often unset)
#* INTERNAL_IP4_NETMASKLEN -- netmask length (often unset)
#* INTERNAL_IP4_NETADDR -- address of network (only present if netmask is set)
#* INTERNAL_IP4_DNS -- list of DNS servers
#* INTERNAL_IP4_NBNS -- list of WINS servers
#* INTERNAL_IP6_ADDRESS -- IPv6 address
#* INTERNAL_IP6_NETMASK -- IPv6 netmask
#* INTERNAL_IP6_DNS -- IPv6 list of dns servers
#* CISCO_DEF_DOMAIN -- default domain name
#* CISCO_BANNER -- banner from server
#* CISCO_SPLIT_DNS -- DNS search domain list
#* CISCO_SPLIT_INC -- number of networks in split-network-list
#* CISCO_SPLIT_INC_%d_ADDR -- network address
#* CISCO_SPLIT_INC_%d_MASK -- subnet mask (for example: 255.255.255.0)
#* CISCO_SPLIT_INC_%d_MASKLEN -- subnet masklen (for example: 24)
#* CISCO_SPLIT_INC_%d_PROTOCOL -- protocol (often just 0); unused
#* CISCO_SPLIT_INC_%d_SPORT -- source port (often just 0); unused
#* CISCO_SPLIT_INC_%d_DPORT -- destination port (often just 0); unused
#* CISCO_IPV6_SPLIT_INC -- number of networks in IPv6 split-network-list
#* CISCO_IPV6_SPLIT_INC_%d_ADDR -- IPv6 network address
#* CISCO_IPV6_SPLIT_INC_$%d_MASKLEN -- IPv6 subnet masklen
#
# The split tunnel variables above have *_EXC* counterparts for network
# addresses to be excluded from the VPN tunnel.
# FIXMEs:
# Section A: route handling
# 1) The 3 values CISCO_SPLIT_INC_%d_PROTOCOL/SPORT/DPORT are currently being ignored
# In order to use them, we'll probably need os specific solutions
# * Linux: iptables -t mangle -I PREROUTING <conditions> -j ROUTE --oif $TUNDEV
# This would be an *alternative* to changing the routes (and thus 2) and 3)
# shouldn't be relevant at all)
# 2) There are two different functions to set routes: generic routes and the
# default route. Why isn't the defaultroute handled via the generic route case?
# 3) In the split tunnel case, all routes but the default route might get replaced
# without getting restored later. We should explicitly check and save them just
# like the defaultroute
# 4) Replies to a dhcp-server should never be sent into the tunnel
# Section B: Split DNS handling
# 1) Maybe dnsmasq can do something like that
# 2) Parse DNS packets going out via tunnel and redirect them to original DNS-server
# ======== For test logging (CI/CD will uncomment automatically) =========
#TRACE# echo "------------------"
#TRACE# echo "vpnc-script environment:"
#TRACE# env | grep -E '^(CISCO_|INTERNAL_IP|VPNGATEWAY|TUNDEV|IDLE_TIMEOUT|reason)' | sort
#TRACE# echo "------------------"
#TRACE# set -x
# =========== script (variable) setup ====================================
PATH=/sbin:/usr/sbin:$PATH
OS="`uname -s`"
HOOKS_DIR=/etc/vpnc
# Use the PID of the controlling process (vpnc or OpenConnect) to
# uniquely identify this VPN connection. Normally, the parent process
# is a shell, and the grandparent's PID is the relevant one.
# OpenConnect v9.0+ provides VPNPID, so we don't need to determine it.
if [ -z "$VPNPID" ]; then
VPNPID=$PPID
PCMD=`ps -c -o command= -p $PPID`
case "$PCMD" in
*sh) VPNPID=`ps -o ppid= -p $PPID` ;;
esac
fi
DEFAULT_ROUTE_FILE=/var/run/vpnc/defaultroute.${VPNPID}
DEFAULT_ROUTE_FILE_IPV6=/var/run/vpnc/defaultroute_ipv6.${VPNPID}
RESOLV_CONF_BACKUP=/var/run/vpnc/resolv.conf-backup.${VPNPID}
SCRIPTNAME=`basename $0`
# some systems, eg. Darwin & FreeBSD, prune /var/run on boot
if [ ! -d "/var/run/vpnc" ]; then
mkdir -p /var/run/vpnc
[ -x /sbin/restorecon ] && /sbin/restorecon /var/run/vpnc
fi
if ifconfig --help 2>&1 | grep BusyBox > /dev/null; then
ifconfig_syntax_inet=""
else
ifconfig_syntax_inet="inet"
fi
if [ "$OS" = "Linux" ]; then
IPROUTE="`command -v ip | grep '^/'`"
ifconfig_syntax_ptp="pointopoint"
route_syntax_gw="gw"
route_syntax_del="del"
route_syntax_netmask="netmask"
route_syntax_inet6="-6"
route_syntax_inet6_host="-6"
route_syntax_inet6_net="-6"
ifconfig_syntax_add_inet6="add"
ifconfig_syntax_del() { case "$1" in *:*) echo del "$1" ;; *) echo 0.0.0.0 ;; esac; }
netstat_syntax_ipv6="-6"
else
# iproute2 is Linux only; if `command -v ip` returns something on another OS, it's likely an unrelated tool
# (see https://github.com/dlenski/openconnect/issues/132#issuecomment-470475009)
IPROUTE=""
ifconfig_syntax_ptp=""
route_syntax_gw=""
route_syntax_del="delete"
route_syntax_netmask="-netmask"
route_syntax_inet6="-inet6"
route_syntax_inet6_host="-inet6 -host"
route_syntax_inet6_net="-inet6 -net"
ifconfig_syntax_del() { case "$1" in *:*) echo inet6 "$1" delete ;; *) echo "$1" delete ;; esac; }
ifconfig_syntax_add_inet6="inet6"
netstat_syntax_ipv6="-f inet6"
fi
if [ "$OS" = "SunOS" ]; then
route_syntax_interface="-interface"
ifconfig_syntax_ptpv6="$INTERNAL_IP6_ADDRESS"
else
route_syntax_interface=""
ifconfig_syntax_ptpv6=""
fi
RESOLVEDENABLED=0
# detect usage of systemd-resolved via nss-resolve...
grep '^hosts' /etc/nsswitch.conf 2>/dev/null | grep resolve >/dev/null 2>&1 || \
# or via nss-dns with /etc/resolv.conf under control of systemd-resolved
(grep '^hosts' /etc/nsswitch.conf 2>/dev/null | grep dns >/dev/null 2>&1 && readlink /etc/resolv.conf | grep -e '/run/systemd/resolve/stub-resolv.conf$' -e '/usr/lib/systemd/resolv.conf$' -e '/run/systemd/resolve/resolv.conf$' >/dev/null 2>&1)
if [ $? = 0 ];then
command resolvectl status >/dev/null 2>&1 || command systemd-resolve --status >/dev/null 2>&1
if [ $? = 0 ];then
RESOLVEDENABLED=1
fi
fi
if [ -r /etc/openwrt_release ] && [ -n "$OPENWRT_INTERFACE" ]; then
. /etc/functions.sh
include /lib/network
MODIFYRESOLVCONF=modify_resolvconf_openwrt
RESTORERESOLVCONF=restore_resolvconf_openwrt
elif [ -x /usr/bin/resolvectl ] && [ ${RESOLVEDENABLED} = 1 ]; then
# For systemd-resolved (version 239 and above)
MODIFYRESOLVCONF=modify_resolved_manager
RESTORERESOLVCONF=restore_resolved_manager
elif [ -x /usr/bin/busctl ] && [ ${RESOLVEDENABLED} = 1 ]; then
# For systemd-resolved (version 229 and above)
MODIFYRESOLVCONF=modify_resolved_manager_old
RESTORERESOLVCONF=restore_resolved_manager_old
elif [ -x /sbin/resolvconf ] && [ "`basename $(readlink /sbin/resolvconf) 2> /dev/null`" != resolvectl ]; then
# Optional tool on Debian, Ubuntu, Gentoo, FreeBSD and DragonFly BSD
# (ignored if symlink to resolvctl, created by some versions of systemd-resolved)
MODIFYRESOLVCONF=modify_resolvconf_manager
RESTORERESOLVCONF=restore_resolvconf_manager
elif [ -x /sbin/netconfig ] && [ ! -f /etc/slackware-version ]; then
# tool on Suse after 11.1
# Slackware's netconfig is an unrelated tool that should not be invoked here
# (see https://www.linuxquestions.org/questions/slackware-14/vpnc-on-slackware-14-2-is-bringing-up-network-configuration-dialog-each-time-4175595447/#post5646866)
MODIFYRESOLVCONF=modify_resolvconf_suse_netconfig
RESTORERESOLVCONF=restore_resolvconf_suse_netconfig
elif [ -x /sbin/modify_resolvconf ]; then
# Mandatory tool on Suse earlier than 11.1
MODIFYRESOLVCONF=modify_resolvconf_suse
RESTORERESOLVCONF=restore_resolvconf_suse
elif [ -x /usr/sbin/unbound-control ] && /usr/sbin/unbound-control status > /dev/null 2>&1; then
MODIFYRESOLVCONF=modify_resolvconf_unbound
RESTORERESOLVCONF=restore_resolvconf_unbound
elif [ -x /usr/sbin/rcctl ] && /usr/sbin/rcctl check resolvd >/dev/null; then
# OpenBSD's resolvd by sending route messages
MODIFYRESOLVCONF=modify_resolvconf_resolvd
RESTORERESOLVCONF=restore_resolvconf_resolvd
else # Generic for any OS
MODIFYRESOLVCONF=modify_resolvconf_generic
RESTORERESOLVCONF=restore_resolvconf_generic
fi
# =========== script hooks =================================================
run_hooks() {
HOOK="$1"
if [ -d ${HOOKS_DIR}/${HOOK}.d ]; then
for script in ${HOOKS_DIR}/${HOOK}.d/* ; do
[ -f $script ] && . $script
done
fi
}
# =========== tunnel interface handling ====================================
do_ifconfig() {
if [ -n "$INTERNAL_IP4_MTU" ]; then
MTU=$INTERNAL_IP4_MTU
elif [ -n "$IPROUTE" ]; then
MTUDEV=`$IPROUTE route get "$VPNGATEWAY" | sed -ne 's/^.*dev \([a-z0-9]*\).*$/\1/p'`
MTU=`$IPROUTE link show "$MTUDEV" | sed -ne 's/^.*mtu \([[:digit:]]\+\).*$/\1/p'`
if [ -n "$MTU" ]; then
MTU=`expr $MTU - 88`
fi
fi
if [ -z "$MTU" ]; then
MTU=1412
fi
# Point to point interface require a netmask of 255.255.255.255 on some systems
if [ -n "$IPROUTE" ]; then
$IPROUTE link set dev "$TUNDEV" up mtu "$MTU"
$IPROUTE addr add "$INTERNAL_IP4_ADDRESS/32" peer "$INTERNAL_IP4_ADDRESS" dev "$TUNDEV"
else
ifconfig "$TUNDEV" ${ifconfig_syntax_inet} "$INTERNAL_IP4_ADDRESS" $ifconfig_syntax_ptp "$INTERNAL_IP4_ADDRESS" netmask 255.255.255.255 mtu ${MTU} up
fi
if [ -n "$INTERNAL_IP4_NETMASK" ]; then
set_network_route "$INTERNAL_IP4_NETADDR" "$INTERNAL_IP4_NETMASK" "$INTERNAL_IP4_NETMASKLEN" "$TUNDEV"
fi
# If the netmask is provided, it contains the address _and_ netmask
if [ -n "$INTERNAL_IP6_ADDRESS" ] && [ -z "$INTERNAL_IP6_NETMASK" ]; then
INTERNAL_IP6_NETMASK="$INTERNAL_IP6_ADDRESS/128"
fi
if [ -n "$INTERNAL_IP6_NETMASK" ]; then
if [ -n "$IPROUTE" ]; then
$IPROUTE -6 addr add $INTERNAL_IP6_NETMASK dev $TUNDEV
else
# Unlike for Legacy IP, we don't specify the dest_address
# here on *BSD. OpenBSD for one will refuse to accept
# incoming packets to that address if we do.
# OpenVPN does the same (gives dest_address for Legacy IP
# but not for IPv6).
# Only Solaris needs it; hence $ifconfig_syntax_ptpv6
ifconfig "$TUNDEV" $ifconfig_syntax_add_inet6 $INTERNAL_IP6_NETMASK $ifconfig_syntax_ptpv6 mtu $MTU up
fi
fi
}
# =========== route handling ====================================
if [ -n "$IPROUTE" ]; then
fix_ip_get_output () {
sed -e 's/ /\n/g' | \
sed -ne "1 s|\$|${1}|p;/via/{N;p};/dev/{N;p};/src/{N;p};/mtu/{N;p};/metric/{N;p};/onlink/{p}"
}
# returns all routes to a destination *except* those through $TUNDEV,
# sorted by increasing metric (with absent metric as last)
list_non_loopback_routes () {
echo "$1" | grep -q : && FAMILY=-6 ROOT=::/0 || FAMILY=-4 ROOT=0/0
# put metric in front, sort by metric, then chop off first two fields (metric and destination)
$IPROUTE $FAMILY route show to "$1" root "$ROOT" |
awk '/dev '"$TUNDEV"'/ { next; } { printf "%s %s\n", (match($0, /metric ([^ ]+)/) ? substr($0, RSTART+7, RLENGTH-7) : 4294967295), $0; }' |
sort -n | cut -d' ' -f3-
}
set_vpngateway_route() {
# We'll attempt to add a host route to the gateway through every route that matches
# its address (excluding those through TUNDEV because the goal is to avoid loopback).
echo "$VPNGATEWAY" | grep -q : && FAMILY=-6 || FAMILY=-4
list_non_loopback_routes "$VPNGATEWAY" |
while read LINE ; do
# We do not want to use 'replace', since a route to the gateway that already
# exists is mostly likely the correct one (e.g. the case of a reconnect attempt
# after dead-peer detection, but no change in the underlying network devices).
$IPROUTE $FAMILY route add `echo "$VPNGATEWAY $LINE" | fix_ip_get_output` 2>/dev/null
done
if [ $FAMILY != -4 ]; then
$IPROUTE $FAMILY route flush cache 2>/dev/null
fi
}
del_vpngateway_route() {
echo "$VPNGATEWAY" | grep -q : && FAMILY=-6 || FAMILY=-4
$IPROUTE route $route_syntax_del "$VPNGATEWAY"
if [ $FAMILY != -4 ]; then
$IPROUTE $FAMILY route flush cache 2>/dev/null
fi
}
set_default_route() {
$IPROUTE route | grep '^default' | fix_ip_get_output > "$DEFAULT_ROUTE_FILE"
$IPROUTE route replace default dev "$TUNDEV"
}
set_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
NETDEV="$4"
NETGW="$5"
if [ -n "$NETGW" ]; then
$IPROUTE route replace "$NETWORK/$NETMASKLEN" dev "$NETDEV" via "$NETGW"
else
$IPROUTE route replace "$NETWORK/$NETMASKLEN" dev "$NETDEV"
fi
}
set_exclude_route() {
# add explicit route to keep current routing for this target
# (keep traffic separate from VPN tunnel)
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
list_non_loopback_routes "$NETWORK/$NETMASKLEN" |
while read LINE ; do
$IPROUTE route add `echo "$NETWORK/$NETMASKLEN $LINE" | fix_ip_get_output` 2>/dev/null
done
}
del_exclude_route() {
# FIXME: In theory, this could delete existing routes which are
# identical to split-exclude routes specified by VPNGATEWAY
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
$IPROUTE route $route_syntax_del "$NETWORK/$NETMASKLEN"
}
reset_default_route() {
if [ -s "$DEFAULT_ROUTE_FILE" ]; then
$IPROUTE route replace `cat "$DEFAULT_ROUTE_FILE"`
rm -f -- "$DEFAULT_ROUTE_FILE"
fi
}
del_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
NETDEV="$4"
$IPROUTE route $route_syntax_del "$NETWORK/$NETMASKLEN" dev "$NETDEV"
}
set_ipv6_default_route() {
# We don't save/restore IPv6 default route; just add a higher-priority one.
$IPROUTE -6 route add default dev "$TUNDEV" metric 1
$IPROUTE -6 route flush cache 2>/dev/null
}
set_ipv6_network_route() {
NETWORK="$1"
NETMASKLEN="$2"
NETDEV="$3"
NETGW="$4"
if [ -n "$NETGW" ]; then
$IPROUTE -6 route replace "$NETWORK/$NETMASKLEN" dev "$NETDEV" via "$NETGW"
else
$IPROUTE -6 route replace "$NETWORK/$NETMASKLEN" dev "$NETDEV"
fi
$IPROUTE -6 route flush cache 2>/dev/null
}
set_ipv6_exclude_route() {
NETWORK="$1"
NETMASKLEN="$2"
set_exclude_route "$NETWORK" nomask "$NETMASKLEN"
}
reset_ipv6_default_route() {
$IPROUTE -6 route del default dev "$TUNDEV"
$IPROUTE -6 route flush cache 2>/dev/null
}
del_ipv6_network_route() {
NETWORK="$1"
NETMASKLEN="$2"
NETDEV="$3"
$IPROUTE -6 route del "$NETWORK/$NETMASKLEN" dev "$NETDEV"
$IPROUTE -6 route flush cache 2>/dev/null
}
del_ipv6_exclude_route() {
# FIXME: In theory, this could delete existing routes which are
# identical to split-exclude routes specified by VPNGATEWAY
NETWORK="$1"
NETMASKLEN="$2"
$IPROUTE -6 route del "$NETWORK/$NETMASKLEN"
$IPROUTE -6 route flush cache 2>/dev/null
}
else # use route command
get_default_gw() {
# Intended behavior, starting with `netstat -r -n` output:
# - keep lines starting with 'default' or '0.0.0.0', but exclude bogus routes '0.0.0.0/nn' where nn != 0
# - remove lines containing IPv6 addresses (':')
# - remove lines for link-local routes (https://superuser.com/a/1067742)
# - remove lines containing $TUNDEV (we don't want loopback)
netstat -r -n | awk '/:/ { next; } /link#/ { next; } /^(default|0\.0\.0\.0([[:space:]]|\/0))/ { print $2; exit; } /[[:space:]]'"$TUNDEV"'([[:space:]]|$)/ { next; }'
}
set_vpngateway_route() {
# Unlike with iproute2, there is no way to determine which current
# route(s) match the VPN gateway, so we simply find a default
# route and use its gateway.
case "$VPNGATEWAY" in
*:*) route add $route_syntax_inet6_host "$VPNGATEWAY" $route_syntax_gw "`get_ipv6_default_gw`";;
*) route add -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`";;
esac
}
del_vpngateway_route() {
case "$VPNGATEWAY" in
*:*) route $route_syntax_del $route_syntax_inet6_host "$VPNGATEWAY" $route_syntax_gw "`get_ipv6_default_gw`";;
*) route $route_syntax_del -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`";;
esac
}
set_default_route() {
DEFAULTGW="`get_default_gw`"
echo "$DEFAULTGW" > "$DEFAULT_ROUTE_FILE"
route $route_syntax_del default $route_syntax_gw "$DEFAULTGW"
route add default $route_syntax_gw "$INTERNAL_IP4_ADDRESS" $route_syntax_interface
}
set_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
if [ -n "$5" ]; then
NETGW="$5"
else
NETGW="$INTERNAL_IP4_ADDRESS"
fi
route add -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$NETGW" $route_syntax_interface
}
set_exclude_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
DEFAULTGW="${DEFAULTGW:-`get_default_gw`}"
if [ -z "$DEFAULTGW" ]; then
echo "cannot find route for exclude route $NETWORK/$NETMASKLEN, ignoring" >&2
return
fi
# Add explicit route to keep traffic for this target separate
# from tunnel. FIXME: We use default gateway - this is our best
# guess in absence of "ip" command to query effective route.
route add -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$DEFAULTGW" $route_syntax_interface
}
del_exclude_route() {
# FIXME: This can delete existing routes in case they're
# identical to split-exclude routes specified by VPNGATEWAY
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
route $route_syntax_del -net "$NETWORK" $route_syntax_netmask "$NETMASK"
}
reset_default_route() {
if [ -s "$DEFAULT_ROUTE_FILE" ]; then
route $route_syntax_del default $route_syntax_gw `get_default_gw` $route_syntax_interface
route add default $route_syntax_gw `cat "$DEFAULT_ROUTE_FILE"`
rm -f -- "$DEFAULT_ROUTE_FILE"
fi
}
del_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
if [ -n "$5" ]; then
NETGW="$5"
else
NETGW="$INTERNAL_IP4_ADDRESS"
fi
route $route_syntax_del -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$NETGW"
}
get_ipv6_default_gw() {
# Intended behavior, starting with `netstat -r -n` IPv6 output:
# - keep lines starting with 'default' or '::'
# - append %$interface to link-local routes (fe80::/10)
# - remove lines for loopback interface (lo)
# - remove lines containing $TUNDEV (we don't want loopback)
# FIXME: is there a better way to exclude loopback routes than filtering interface /^lo/?
netstat -r -n $netstat_syntax_ipv6 | awk '/^(default|::\/0)/ { if ($NF!~/^lo/ && $NF!~/'"$TUNDEV"'([[:space:]]|$)/) { print ($2~/^fe[89ab]/ ? $2"%"$NF : $2); } }'
}
set_ipv6_default_route() {
DEFAULTGW="`get_ipv6_default_gw`"
echo "$DEFAULTGW" > "$DEFAULT_ROUTE_FILE_IPV6"
route $route_syntax_del $route_syntax_inet6 default $route_syntax_gw "$DEFAULTGW"
route add $route_syntax_inet6 default $route_syntax_gw "$INTERNAL_IP6_ADDRESS" $route_syntax_interface
}
set_ipv6_network_route() {
NETWORK="$1"
NETMASK="$2"
DEVICE="$3"
if [ -n "$4" ]; then
NETGW="$4"
elif [ "$OS" = "Linux" ]; then
route add $route_syntax_inet6_net "$NETWORK/$NETMASK" dev "$DEVICE"
return
else
NETGW="$INTERNAL_IP6_ADDRESS"
fi
route add $route_syntax_inet6_net "$NETWORK/$NETMASK" $route_syntax_gw "$NETGW" $route_syntax_interface
:
}
set_ipv6_exclude_route() {
NETWORK="$1"
NETMASK="$2"
IPV6DEFAULTGW="${IPV6DEFAULTGW:-`get_ipv6_default_gw`}"
if [ -z "$IPV6DEFAULTGW" ]; then
echo "cannot find route for exclude route $NETWORK/$NETMASKLEN, ignoring" >&2
return
fi
# Add explicit route to keep traffic for this target separate
# from tunnel. FIXME: We use default gateway - this is our best
# guess in absence of "ip" command to query effective route.
route add $route_syntax_inet6_net "$NETWORK/$NETMASK" "$IPV6DEFAULTGW" $route_syntax_interface
:
}
reset_ipv6_default_route() {
if [ -s "$DEFAULT_ROUTE_FILE_IPV6" ]; then
route $route_syntax_del $route_syntax_inet6 default $route_syntax_gw "`get_ipv6_default_gw`" $route_syntax_interface
route add $route_syntax_inet6 default $route_syntax_gw `cat "$DEFAULT_ROUTE_FILE_IPV6"`
rm -f -- "$DEFAULT_ROUTE_FILE_IPV6"
fi
:
}
del_ipv6_network_route() {
NETWORK="$1"
NETMASK="$2"
DEVICE="$3"
if [ -n "$4" ]; then
NETGW="$4"
elif [ "$OS" = "Linux" ]; then
route $route_syntax_del $route_syntax_inet6 "$NETWORK/$NETMASK" dev "$DEVICE"
return
else
NETGW="$INTERNAL_IP6_ADDRESS"
fi
route $route_syntax_del $route_syntax_inet6 "$NETWORK/$NETMASK" $route_syntax_gw "$NETGW"
:
}
del_ipv6_exclude_route() {
NETWORK="$1"
NETMASK="$2"
route $route_syntax_del $route_syntax_inet6 "$NETWORK/$NETMASK"
:
}
fi
# =========== resolv.conf handling ====================================
# =========== resolv.conf handling for any OS =========================
modify_resolvconf_generic() {
grep '^#@VPNC_GENERATED@' /etc/resolv.conf > /dev/null 2>&1 || cp -- /etc/resolv.conf "$RESOLV_CONF_BACKUP"
NEW_RESOLVCONF="#@VPNC_GENERATED@ -- this file is generated by vpnc
# and will be overwritten by vpnc
# as long as the above mark is intact"
DOMAINS="$CISCO_DEF_DOMAIN"
exec 6< "$RESOLV_CONF_BACKUP"
while read LINE <&6 ; do
case "$LINE" in
# omit; we will overwrite these
nameserver*) ;;
# extract listed domains and prepend to list
domain* | search*) DOMAINS="${LINE#* } $DOMAINS" ;;
# retain other lines
*) NEW_RESOLVCONF="$NEW_RESOLVCONF
$LINE" ;;
esac
done
exec 6<&-
for i in $INTERNAL_IP4_DNS ; do
NEW_RESOLVCONF="$NEW_RESOLVCONF
nameserver $i"
done
# note that "search" is mutually exclusive with "domain";
# "search" allows multiple domains to be listed, so use that
if [ -n "$DOMAINS" ]; then
NEW_RESOLVCONF="$NEW_RESOLVCONF
search $DOMAINS"
fi
echo "$NEW_RESOLVCONF" > /etc/resolv.conf
if [ "$OS" = "Darwin" ]; then
case "`uname -r`" in
# Skip for pre-10.4 systems
4.*|5.*|6.*|7.*)
;;
# 10.4 and later require use of scutil for DNS to work properly
*)
OVERRIDE_PRIMARY=""
if [ -n "$CISCO_SPLIT_INC" ]; then
if [ $CISCO_SPLIT_INC -lt 1 ]; then
# Must override for correct default route
# Cannot use multiple DNS matching in this case
OVERRIDE_PRIMARY='d.add OverridePrimary # 1'
fi
# Overriding the default gateway breaks split routing
OVERRIDE_GATEWAY=""
# Not overriding the default gateway breaks usage of
# INTERNAL_IP4_DNS. Prepend INTERNAL_IP4_DNS to list
# of used DNS servers
SERVICE=`echo "show State:/Network/Global/IPv4" | scutil | grep -oE '[a-fA-F0-9]{8}-([a-fA-F0-9]{4}-){3}[a-fA-F0-9]{12}'`
SERVICE_DNS=`echo "show State:/Network/Service/$SERVICE/DNS" | scutil | grep -oE '([0-9]{1,3}[\.]){3}[0-9]{1,3}' | xargs`
if [ X"$SERVICE_DNS" != X"$INTERNAL_IP4_DNS" ]; then
scutil >/dev/null 2>&1 <<-EOF
open
get State:/Network/Service/$SERVICE/DNS
d.add ServerAddresses * $INTERNAL_IP4_DNS $SERVICE_DNS
set State:/Network/Service/$SERVICE/DNS
close
EOF
fi
else
# No split routing. Override default gateway
OVERRIDE_GATEWAY="d.add Router $INTERNAL_IP4_ADDRESS"
fi
# Uncomment the following if/fi pair to use multiple
# DNS matching when available. When multiple DNS matching
# is present, anything reading the /etc/resolv.conf file
# directly will probably not work as intended.
#if [ -z "$CISCO_DEF_DOMAIN" ]; then
# Cannot use multiple DNS matching without a domain
OVERRIDE_PRIMARY='d.add OverridePrimary # 1'
#fi
scutil >/dev/null 2>&1 <<-EOF
open
d.init
d.add ServerAddresses * $INTERNAL_IP4_DNS
set State:/Network/Service/$TUNDEV/DNS
d.init
$OVERRIDE_GATEWAY
d.add Addresses * $INTERNAL_IP4_ADDRESS
d.add SubnetMasks * 255.255.255.255
d.add InterfaceName $TUNDEV
$OVERRIDE_PRIMARY
set State:/Network/Service/$TUNDEV/IPv4
close
EOF
if [ -n "$CISCO_DEF_DOMAIN" ]; then
scutil >/dev/null 2>&1 <<-EOF
open
get State:/Network/Service/$TUNDEV/DNS
d.add DomainName $CISCO_DEF_DOMAIN
d.add SearchDomains * $CISCO_DEF_DOMAIN
d.add SupplementalMatchDomains * $CISCO_DEF_DOMAIN
set State:/Network/Service/$TUNDEV/DNS
close
EOF
fi
# For newer MacOS versions it is needed to set DNS
ACTIVE_INTERFACE=`route -n get default | grep interface | awk '{print $2}'`
ACTIVE_NETWORK_SERVICE=`networksetup -listnetworkserviceorder | grep -B 1 "$ACTIVE_INTERFACE" | head -n 1 | awk '/\([0-9]+\)/{ print }'|cut -d " " -f2-`
networksetup -setdnsservers "$ACTIVE_NETWORK_SERVICE" $INTERNAL_IP4_DNS
;;
esac
fi
}
restore_resolvconf_generic() {
if [ ! -f "$RESOLV_CONF_BACKUP" ]; then
return
fi
grep '^#@VPNC_GENERATED@' /etc/resolv.conf > /dev/null 2>&1 && cat "$RESOLV_CONF_BACKUP" > /etc/resolv.conf
rm -f -- "$RESOLV_CONF_BACKUP"
if [ "$OS" = "Darwin" ]; then
case "`uname -r`" in
# Skip for pre-10.4 systems
4.*|5.*|6.*|7.*)
;;
# 10.4 and later require use of scutil for DNS to work properly
*)
scutil >/dev/null 2>&1 <<-EOF
open
remove State:/Network/Service/$TUNDEV/IPv4
remove State:/Network/Service/$TUNDEV/DNS
close
EOF
# Split routing required prepending of INTERNAL_IP4_DNS
# to list of used DNS servers
if [ -n "$CISCO_SPLIT_INC" ]; then
SERVICE=`echo "show State:/Network/Global/IPv4" | scutil | grep -oE '[a-fA-F0-9]{8}-([a-fA-F0-9]{4}-){3}[a-fA-F0-9]{12}'`
SERVICE_DNS=`echo "show State:/Network/Service/$SERVICE/DNS" | scutil | grep -oE '([0-9]{1,3}[\.]){3}[0-9]{1,3}'`
FILTERED_SERVICE_DNS=`echo "$SERVICE_DNS" | grep -Fv "$(echo $INTERNAL_IP4_DNS | tr ' ' '\n')" | xargs`
if [ -n "$FILTERED_SERVICE_DNS" ]; then
scutil >/dev/null 2>&1 <<-EOF
open
get State:/Network/Service/$SERVICE/DNS
d.add ServerAddresses * ${FILTERED_SERVICE_DNS}
set State:/Network/Service/$SERVICE/DNS
close
EOF
fi
fi
# For newer MacOS versions it is needed to unset DNS
ACTIVE_INTERFACE=`route -n get default | grep interface | awk '{print $2}'`
ACTIVE_NETWORK_SERVICE=`networksetup -listnetworkserviceorder | grep -B 1 "$ACTIVE_INTERFACE" | head -n 1 | awk '/\([0-9]+\)/{ print }'|cut -d " " -f2-`
networksetup -setdnsservers "$ACTIVE_NETWORK_SERVICE" Empty
;;
esac
fi
}
# === resolv.conf handling via /sbin/netconfig (Suse 11.1) =====================
# Suse provides a script that modifies resolv.conf. Use it because it will
# restart/reload all other services that care about it (e.g. lwresd). [unclear if this is still true, but probably --mlk]
modify_resolvconf_suse_netconfig()
{
/sbin/netconfig modify -s vpnc -i "$TUNDEV" <<-EOF
INTERFACE='$TUNDEV'
DNSSERVERS='$INTERNAL_IP4_DNS'
DNSDOMAIN='$CISCO_DEF_DOMAIN'
EOF
}
# Restore resolv.conf to old contents on Suse
restore_resolvconf_suse_netconfig()
{
/sbin/netconfig remove -s vpnc -i "$TUNDEV"
}
# === resolv.conf handling via /sbin/modify_resolvconf (Suse) =====================
# Suse provides a script that modifies resolv.conf. Use it because it will
# restart/reload all other services that care about it (e.g. lwresd).
modify_resolvconf_suse()
{
FULL_SCRIPTNAME=`readlink -f $0`
RESOLV_OPTS=''
test -n "$INTERNAL_IP4_DNS" && RESOLV_OPTS="-n \"$INTERNAL_IP4_DNS\""
test -n "$CISCO_DEF_DOMAIN" && RESOLV_OPTS="$RESOLV_OPTS -d $CISCO_DEF_DOMAIN"
test -n "$RESOLV_OPTS" && eval /sbin/modify_resolvconf modify -s vpnc -p $SCRIPTNAME -f $FULL_SCRIPTNAME -e $TUNDEV $RESOLV_OPTS -t \"This file was created by $SCRIPTNAME\"
}
# Restore resolv.conf to old contents on Suse
restore_resolvconf_suse()
{
FULL_SCRIPTNAME=`readlink -f $0`
/sbin/modify_resolvconf restore -s vpnc -p $SCRIPTNAME -f $FULL_SCRIPTNAME -e $TUNDEV
}
# === resolv.conf handling via UCI (OpenWRT) =========
modify_resolvconf_openwrt() {
add_dns $OPENWRT_INTERFACE $INTERNAL_IP4_DNS
}
restore_resolvconf_openwrt() {
remove_dns $OPENWRT_INTERFACE
}
# === resolv.conf handling via /sbin/resolvconf (Debian, Ubuntu, Gentoo)) =========
modify_resolvconf_manager() {
NEW_RESOLVCONF=""
for i in $INTERNAL_IP4_DNS; do
NEW_RESOLVCONF="$NEW_RESOLVCONF
nameserver $i"
done
if [ -n "$CISCO_DEF_DOMAIN" ]; then
NEW_RESOLVCONF="$NEW_RESOLVCONF
search $CISCO_DEF_DOMAIN"
fi
echo "$NEW_RESOLVCONF" | /sbin/resolvconf -a $TUNDEV
}
restore_resolvconf_manager() {
/sbin/resolvconf -d $TUNDEV
}
# === resolv.conf handling via systemd-resolved =========
AF_INET=2
get_if_index() {
local link
link="$(ip link show dev "$1")" || return $?
echo ${link} | awk -F: '{print $1}'
}
busctl_call() {
local dest node
dest=org.freedesktop.resolve1
node=/org/freedesktop/resolve1
busctl call "$dest" "${node}" "${dest}.Manager" "$@"
}
busctl_set_nameservers() {
local if_index addresses args addr
if_index=$1
shift
addresses="$@"
args="$if_index $#"
for addr in ${addresses}; do
args="$args ${AF_INET} 4 $(echo $addr | sed 's/[.]/ /g')"
done
busctl_call SetLinkDNS 'ia(iay)' ${args}
}
resolvectl_set_nameservers() {
local if_index addresses
if_index=$1
shift
addresses="$@"
/usr/bin/resolvectl dns $if_index $addresses
}
busctl_set_search() {
local if_index domains args domain
if_index=$1
shift
domains="$@"
args="$if_index $#"
for domain in ${domains}; do
args="$args ${domain} false"
done
busctl_call SetLinkDomains 'ia(sb)' ${args}
}
resolvectl_set_search() {
local if_index domains
if_index=$1
shift
domains="$@"
/usr/bin/resolvectl domain $if_index $domains
}
modify_resolved_manager() {
local if_index split_dns_list
if_index=$(get_if_index $TUNDEV)
split_dns_list=$(echo $CISCO_SPLIT_DNS | tr ',' ' ')
resolvectl_set_nameservers $if_index $INTERNAL_IP4_DNS
if [ -n "$CISCO_DEF_DOMAIN" ] || [ -n "$split_dns_list" ]; then
resolvectl_set_search $if_index $CISCO_DEF_DOMAIN $split_dns_list
fi
}
modify_resolved_manager_old() {
local if_index
if_index=$(get_if_index $TUNDEV)
busctl_set_nameservers $if_index $INTERNAL_IP4_DNS
if [ -n "$CISCO_DEF_DOMAIN" ]; then
busctl_set_search $if_index $CISCO_DEF_DOMAIN
fi
}
restore_resolved_manager() {
local if_index
if_index=$(get_if_index $TUNDEV)
/usr/bin/resolvectl revert $if_index
}
restore_resolved_manager_old() {
local if_index
if_index=$(get_if_index $TUNDEV)
busctl_call RevertLink 'i' $if_index
}
# === resolv.conf handling via unbound =========
modify_resolvconf_unbound() {
if [ -n "$CISCO_DEF_DOMAIN" ]; then
/usr/sbin/unbound-control forward_add +i ${CISCO_DEF_DOMAIN} ${INTERNAL_IP4_DNS}
/usr/sbin/unbound-control flush_requestlist
/usr/sbin/unbound-control flush_zone ${CISCO_DEF_DOMAIN}
# flush infra cache
for i in $INTERNAL_IP4_DNS ; do
/usr/sbin/unbound-control flush_infra "$i"
done
fi
}
restore_resolvconf_unbound() {
if [ -n "$CISCO_DEF_DOMAIN" ]; then
/usr/sbin/unbound-control forward_remove +i ${CISCO_DEF_DOMAIN}
/usr/sbin/unbound-control flush_zone ${CISCO_DEF_DOMAIN}
/usr/sbin/unbound-control flush_requestlist
fi
}
# === resolv.conf handling via resolvd (OpenBSD) =========
modify_resolvconf_resolvd() {
/sbin/route nameserver $TUNDEV $INTERNAL_IP4_DNS $INTERNAL_IP6_DNS
}
restore_resolvconf_resolvd() {
/sbin/route nameserver $TUNDEV
}
# ========= Toplevel state handling =======================================
do_pre_init() {
if [ "$OS" = "Linux" ]; then
if (exec 6< /dev/net/tun) > /dev/null 2>&1 ; then
:
else # can't open /dev/net/tun
test -e /proc/sys/kernel/modprobe && `cat /proc/sys/kernel/modprobe` tun 2>/dev/null
# make sure tun device exists
if [ ! -e /dev/net/tun ]; then
mkdir -p /dev/net
mknod -m 0640 /dev/net/tun c 10 200
[ -x /sbin/restorecon ] && /sbin/restorecon /dev/net/tun
fi
# workaround for a possible latency caused by udev, sleep max. 10s
for x in $(seq 100) ; do
(exec 6<> /dev/net/tun) > /dev/null 2>&1 && break;
sleep 0.1
done
fi
elif [ "$OS" = "FreeBSD" -o "$OS" = "DragonFly" ]; then
if ! ifconfig $TUNDEV > /dev/null; then
ifconfig $TUNDEV create
fi
elif [ "$OS" = "GNU/kFreeBSD" ]; then
if [ ! -e /dev/tun ]; then
kldload if_tun
fi
elif [ "$OS" = "NetBSD" ]; then
:
elif [ "$OS" = "OpenBSD" ]; then
if ! ifconfig $TUNDEV > /dev/null; then
ifconfig $TUNDEV create
fi
:
elif [ "$OS" = "SunOS" ]; then
:
elif [ "$OS" = "Darwin" ]; then
:
fi
}
do_connect() {
if [ -n "$CISCO_BANNER" ]; then
echo "Connect Banner:"
echo "$CISCO_BANNER" | while read LINE ; do echo "|" "$LINE" ; done
echo
fi
case "$VPNGATEWAY" in
127.*|::1) ;; # localhost (probably proxy)
*) set_vpngateway_route ;;
esac
do_ifconfig
if [ -n "$CISCO_SPLIT_EXC" ]; then
i=0
while [ $i -lt $CISCO_SPLIT_EXC ] ; do
eval NETWORK="\${CISCO_SPLIT_EXC_${i}_ADDR}"
eval NETMASK="\${CISCO_SPLIT_EXC_${i}_MASK}"
eval NETMASKLEN="\${CISCO_SPLIT_EXC_${i}_MASKLEN}"
case "$NETWORK" in
0.*|127.*|169.254.*) echo "ignoring non-forwardable exclude route $NETWORK/$NETMASKLEN" >&2 ;;
*) set_exclude_route "$NETWORK" "$NETMASK" "$NETMASKLEN" ;;
esac
i=`expr $i + 1`
done
fi
if [ -n "$CISCO_IPV6_SPLIT_EXC" ]; then
# untested
i=0
while [ $i -lt $CISCO_IPV6_SPLIT_EXC ] ; do
eval NETWORK="\${CISCO_IPV6_SPLIT_EXC_${i}_ADDR}"
eval NETMASKLEN="\${CISCO_IPV6_SPLIT_EXC_${i}_MASKLEN}"
set_ipv6_exclude_route "$NETWORK" "$NETMASKLEN"
i=`expr $i + 1`
done
fi
if [ -n "$CISCO_SPLIT_INC" ]; then
i=0
while [ $i -lt $CISCO_SPLIT_INC ] ; do
eval NETWORK="\${CISCO_SPLIT_INC_${i}_ADDR}"
eval NETMASK="\${CISCO_SPLIT_INC_${i}_MASK}"
eval NETMASKLEN="\${CISCO_SPLIT_INC_${i}_MASKLEN}"
if [ "$NETWORK" != "0.0.0.0" ]; then
set_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$TUNDEV"
else
set_default_route
fi
i=`expr $i + 1`
done
elif [ -n "$INTERNAL_IP4_ADDRESS" ]; then
set_default_route
fi
if [ -n "$CISCO_IPV6_SPLIT_INC" ]; then
i=0
while [ $i -lt $CISCO_IPV6_SPLIT_INC ] ; do
eval NETWORK="\${CISCO_IPV6_SPLIT_INC_${i}_ADDR}"
eval NETMASKLEN="\${CISCO_IPV6_SPLIT_INC_${i}_MASKLEN}"
if [ $NETMASKLEN -eq 0 ]; then
set_ipv6_default_route
else
set_ipv6_network_route "$NETWORK" "$NETMASKLEN" "$TUNDEV"
fi
i=`expr $i + 1`
done
elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
set_ipv6_default_route
fi
if [ -n "$INTERNAL_IP4_DNS" ]; then
$MODIFYRESOLVCONF
fi
}
do_disconnect() {
if [ -n "$CISCO_SPLIT_INC" ]; then
i=0
while [ $i -lt $CISCO_SPLIT_INC ] ; do
eval NETWORK="\${CISCO_SPLIT_INC_${i}_ADDR}"
eval NETMASK="\${CISCO_SPLIT_INC_${i}_MASK}"
eval NETMASKLEN="\${CISCO_SPLIT_INC_${i}_MASKLEN}"
if [ "$NETWORK" != "0.0.0.0" ]; then
# FIXME: This doesn't restore previously overwritten
# routes.
del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$TUNDEV"
else
reset_default_route
fi
i=`expr $i + 1`
done
else
reset_default_route
fi
if [ -n "$CISCO_SPLIT_EXC" ]; then
i=0
while [ $i -lt $CISCO_SPLIT_EXC ] ; do
eval NETWORK="\${CISCO_SPLIT_EXC_${i}_ADDR}"
eval NETMASK="\${CISCO_SPLIT_EXC_${i}_MASK}"
eval NETMASKLEN="\${CISCO_SPLIT_EXC_${i}_MASKLEN}"
case "$NETWORK" in
0.*|127.*|169.254.*) ;; # ignoring non-forwardable exclude route
*) del_exclude_route "$NETWORK" "$NETMASK" "$NETMASKLEN" ;;
esac
i=`expr $i + 1`
done
fi
if [ -n "$CISCO_IPV6_SPLIT_EXC" ]; then
# untested
i=0
while [ $i -lt $CISCO_IPV6_SPLIT_EXC ] ; do
eval NETWORK="\${CISCO_IPV6_SPLIT_EXC_${i}_ADDR}"
eval NETMASKLEN="\${CISCO_IPV6_SPLIT_EXC_${i}_MASKLEN}"
del_ipv6_exclude_route "$NETWORK" "$NETMASKLEN"
i=`expr $i + 1`
done
fi
if [ -n "$CISCO_IPV6_SPLIT_INC" ]; then
i=0
while [ $i -lt $CISCO_IPV6_SPLIT_INC ] ; do
eval NETWORK="\${CISCO_IPV6_SPLIT_INC_${i}_ADDR}"
eval NETMASKLEN="\${CISCO_IPV6_SPLIT_INC_${i}_MASKLEN}"
if [ $NETMASKLEN -eq 0 ]; then
reset_ipv6_default_route
else
del_ipv6_network_route "$NETWORK" "$NETMASKLEN" "$TUNDEV"
fi
i=`expr $i + 1`
done
elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
reset_ipv6_default_route
fi
del_vpngateway_route
if [ -n "$INTERNAL_IP4_DNS" ]; then
$RESTORERESOLVCONF
fi
if [ -n "$IPROUTE" ]; then
if [ -n "$INTERNAL_IP4_ADDRESS" ]; then
$IPROUTE addr del "$INTERNAL_IP4_ADDRESS/255.255.255.255" peer "$INTERNAL_IP4_ADDRESS" dev "$TUNDEV"
fi
# If the netmask is provided, it contains the address _and_ netmask
if [ -n "$INTERNAL_IP6_ADDRESS" ] && [ -z "$INTERNAL_IP6_NETMASK" ]; then
INTERNAL_IP6_NETMASK="$INTERNAL_IP6_ADDRESS/128"
fi
if [ -n "$INTERNAL_IP6_NETMASK" ]; then
$IPROUTE -6 addr del $INTERNAL_IP6_NETMASK dev $TUNDEV
fi
$IPROUTE link set dev "$TUNDEV" down
else
if [ -n "$INTERNAL_IP4_ADDRESS" ]; then
ifconfig "$TUNDEV" `ifconfig_syntax_del "$INTERNAL_IP4_ADDRESS"`
fi
if [ -n "$INTERNAL_IP6_ADDRESS" ] && [ -z "$INTERNAL_IP6_NETMASK" ]; then
INTERNAL_IP6_NETMASK="$INTERNAL_IP6_ADDRESS/128"
fi
if [ -n "$INTERNAL_IP6_NETMASK" ]; then
ifconfig "$TUNDEV" `ifconfig_syntax_del "$INTERNAL_IP6_NETMASK"`
fi
ifconfig "$TUNDEV" down
fi
case "$OS" in
NetBSD|OpenBSD) # and probably others...
ifconfig "$TUNDEV" destroy
;;
FreeBSD|DragonFly)
ifconfig "$TUNDEV" destroy > /dev/null 2>&1 &
;;
esac
}
do_attempt_reconnect() {
set_vpngateway_route
}
#### Main
if [ -z "$reason" ]; then
echo "this script must be called from vpnc" 1>&2
exit 1
fi
case "$reason" in
pre-init)
run_hooks pre-init
do_pre_init
;;
connect)
run_hooks connect
do_connect
run_hooks post-connect
;;
disconnect)
run_hooks disconnect
do_disconnect
run_hooks post-disconnect
;;
attempt-reconnect)
# Invoked before each attempt to re-establish the session.
# If the underlying physical connection changed, we might
# be left with a route to the VPN server through the VPN
# itself, which would need to be fixed.
run_hooks attempt-reconnect
do_attempt_reconnect
run_hooks post-attempt-reconnect
;;
reconnect)
# After successfully re-establishing the session.
run_hooks reconnect
;;
*)
echo "unknown reason '$reason'. Maybe vpnc-script is out of date" 1>&2
exit 1
;;
esac
exit 0