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VPNC script which process no-route from ocserv. There is still a lot of problem. Needs reconsideration.
Raw
vpnc-script
#!/bin/sh
#
# Originally part of vpnc source code:
# © 2005-2012 Maurice Massar, Jörg Mayer, Antonio Borneo et al.
# © 2009-2012 David Woodhouse <dwmw2@infradead.org>
#
# 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
#* VPNGATEWAY -- vpn gateway address (always present)
#* TUNDEV -- tunnel device (always present)
#* 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_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)
#* CISCO_SPLIT_INC_%d_SPORT -- source port (often just 0)
#* CISCO_SPLIT_INC_%d_DPORT -- destination port (often just 0)
#* CISCO_SPLIT_EXC -- number of networks in split-network-list
#* CISCO_SPLIT_EXC_%d_ADDR -- network address
#* CISCO_SPLIT_EXC_%d_MASK -- subnet mask (for example: 255.255.255.0)
#* CISCO_SPLIT_EXC_%d_MASKLEN -- subnet masklen (for example: 24)
#* CISCO_SPLIT_EXC_%d_PROTOCOL -- protocol (often just 0)
#* CISCO_SPLIT_EXC_%d_SPORT -- source port (often just 0)
#* CISCO_SPLIT_EXC_%d_DPORT -- destination port (often just 0)
#* 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
# 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 $TUNDEV
# This would be an *alternative* to changing the routes (and thus 2) and 3)
# shouldn't be relevant at all)
# 2) There are two different functions to set routes: generic routes and the
# default route. Why isn't the defaultroute handled via the generic route case?
# 3) In the split tunnel case, all routes but the default route might get replaced
# without getting restored later. We should explicitely check and save them just
# like the defaultroute
# 4) Replies to a dhcp-server should never be sent into the tunnel
# Section B: Split DNS handling
# 1) Maybe dnsmasq can do something like that
# 2) Parse dns packets going out via tunnel and redirect them to original dns-server
#env | sort
#set -x
# =========== script (variable) setup ====================================
PATH=/sbin:/usr/sbin:$PATH
OS="`uname -s`"
HOOKS_DIR=`dirname $0`/vpnc
DEFAULT_ROUTE_FILE=/var/run/vpnc/defaultroute
RESOLV_CONF_BACKUP=/var/run/vpnc/resolv.conf-backup
SCRIPTNAME=`basename $0`
# some systems, eg. Darwin & FreeBSD, prune /var/run on boot
if [ ! -d "/var/run/vpnc" ]; then
mkdir -p /var/run/vpnc
[ -x /sbin/restorecon ] && /sbin/restorecon /var/run/vpnc
fi
# stupid SunOS: no blubber in /usr/local/bin ... (on stdout)
IPROUTE="`which ip 2> /dev/null | grep '^/'`"
if ifconfig --help 2>&1 | grep BusyBox > /dev/null; then
ifconfig_syntax_inet=""
else
ifconfig_syntax_inet="inet"
fi
if [ "$OS" = "Linux" ]; then
ifconfig_syntax_ptp="pointopoint"
route_syntax_gw="gw"
route_syntax_del="del"
route_syntax_netmask="netmask"
else
ifconfig_syntax_ptp=""
route_syntax_gw=""
route_syntax_del="delete"
route_syntax_netmask="-netmask"
fi
if [ "$OS" = "SunOS" ]; then
route_syntax_interface="-interface"
ifconfig_syntax_ptpv6="$INTERNAL_IP6_ADDRESS"
else
route_syntax_interface=""
ifconfig_syntax_ptpv6=""
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 /sbin/resolvconf ]; then # Optional tool on Debian, Ubuntu, Gentoo and FreeBSD
MODIFYRESOLVCONF=modify_resolvconf_manager
RESTORERESOLVCONF=restore_resolvconf_manager
elif [ -x /sbin/netconfig ]; then # tool on Suse after 11.1
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
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 $INTERNAL_IP4_NETMASKLEN
fi
# If the netmask is provided, it contains the address _and_ netmask
if [ -n "$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" inet6 $INTERNAL_IP6_NETMASK $ifconfig_syntax_ptpv6 mtu $MTU up
fi
fi
}
destroy_tun_device() {
case "$OS" in
NetBSD|OpenBSD) # and probably others...
ifconfig "$TUNDEV" destroy
;;
FreeBSD)
ifconfig "$TUNDEV" destroy > /dev/null 2>&1 &
;;
esac
}
# =========== route handling ====================================
if [ -n "$IPROUTE" ]; then
fix_ip_get_output () {
sed -e 's/ /\n/g' | \
sed -ne '1p;/via/{N;p};/dev/{N;p};/src/{N;p};/mtu/{N;p}'
}
set_vpngateway_route() {
$IPROUTE route add `$IPROUTE route get "$VPNGATEWAY" | fix_ip_get_output`
$IPROUTE route flush cache
}
del_vpngateway_route() {
$IPROUTE route $route_syntax_del "$VPNGATEWAY"
$IPROUTE route flush cache
}
set_default_route() {
$IPROUTE route | grep '^default' | fix_ip_get_output > "$DEFAULT_ROUTE_FILE"
$IPROUTE route replace default dev "$TUNDEV"
$IPROUTE route flush cache
}
set_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
$IPROUTE route replace "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE route flush cache
}
reset_default_route() {
if [ -s "$DEFAULT_ROUTE_FILE" ]; then
$IPROUTE route replace `cat "$DEFAULT_ROUTE_FILE"`
$IPROUTE route flush cache
rm -f -- "$DEFAULT_ROUTE_FILE"
fi
}
del_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
$IPROUTE route $route_syntax_del "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE route flush cache
}
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
}
set_ipv6_network_route() {
NETWORK="$1"
NETMASKLEN="$2"
$IPROUTE -6 route replace "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE route flush cache
}
reset_ipv6_default_route() {
$IPROUTE -6 route del default dev "$TUNDEV"
$IPROUTE route flush cache
}
del_ipv6_network_route() {
NETWORK="$1"
NETMASKLEN="$2"
$IPROUTE -6 route del "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE -6 route flush cache
}
else # use route command
get_default_gw() {
# isn't -n supposed to give --numeric output?
# apperently not...
# Get rid of lines containing IPv6 addresses (':')
netstat -r -n | awk '/:/ { next; } /^(default|0\.0\.0\.0)/ { print $2; }'
}
set_vpngateway_route() {
route add -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`"
}
del_vpngateway_route() {
route $route_syntax_del -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`"
}
set_default_route() {
DEFAULTGW="`get_default_gw`"
echo "$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 "$4" ]; then
GATEWAY="$4"
else
GATEWAY="$INTERNAL_IP4_ADDRESS"
fi
del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$GATEWAY"
route add -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$GATEWAY"
}
reset_default_route() {
if [ -s "$DEFAULT_ROUTE_FILE" ]; then
route $route_syntax_del default $route_syntax_gw "`get_default_gw`"
gw=`cat $DEFAULT_ROUTE_FILE`
route add default $route_syntax_gw "$gw"
rm -f -- "$DEFAULT_ROUTE_FILE"
fi
}
del_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
if [ -n "$4" ]; then
GATEWAY="$4"
else
GATEWAY="$INTERNAL_IP_ADDRESS"
fi
# If we have CISCO_SPLIT_EXC, then it's local route table. And we should delete it.
if [ -n "$CISCO_SPLIT_EXC" ]; then
route $route_syntax_del -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$GATEWAY"
else
case "$OS" in
Linux|NetBSD|OpenBSD|Darwin|SunOS) # and probably others...
# routes are deleted automatically on device shutdown
return
;;
esac
route $route_syntax_del -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$GATEWAY"
fi
}
set_ipv6_default_route() {
route add -inet6 default "$INTERNAL_IP6_ADDRESS" $route_syntax_interface
}
set_ipv6_network_route() {
NETWORK="$1"
NETMASK="$2"
route add -inet6 -net "$NETWORK/$NETMASK" "$INTERNAL_IP6_ADDRESS" $route_syntax_interface
:
}
reset_ipv6_default_route() {
route $route_syntax_del -inet6 default "$INTERNAL_IP6_ADDRESS"
:
}
del_ipv6_network_route() {
NETWORK="$1"
NETMASK="$2"
route $route_syntax_del -inet6 "$NETWORK/$NETMASK" "$INTERNAL_IP6_ADDRESS"
:
}
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 "$RESOLV_CONF_BACKUP"
NEW_RESOLVCONF="#@VPNC_GENERATED@ -- this file is generated by vpnc
# and will be overwritten by vpnc
# as long as the above mark is intact"
# Remember the original value of CISCO_DEF_DOMAIN we need it later
CISCO_DEF_DOMAIN_ORIG="$CISCO_DEF_DOMAIN"
# Don't step on INTERNAL_IP4_DNS value, use a temporary variable
INTERNAL_IP4_DNS_TEMP="$INTERNAL_IP4_DNS"
exec 6< "$RESOLV_CONF_BACKUP"
while read LINE <&6 ; do
case "$LINE" in
nameserver*)
if [ -n "$INTERNAL_IP4_DNS_TEMP" ]; then
read ONE_NAMESERVER INTERNAL_IP4_DNS_TEMP <<-EOF
$INTERNAL_IP4_DNS_TEMP
EOF
LINE="nameserver $ONE_NAMESERVER"
else
LINE=""
fi
;;
search*)
if [ -n "$CISCO_DEF_DOMAIN" ]; then
LINE="$LINE $CISCO_DEF_DOMAIN"
CISCO_DEF_DOMAIN=""
fi
;;
domain*)
if [ -n "$CISCO_DEF_DOMAIN" ]; then
LINE="domain $CISCO_DEF_DOMAIN"
CISCO_DEF_DOMAIN=""
fi
;;
esac
NEW_RESOLVCONF="$NEW_RESOLVCONF
$LINE"
done
exec 6<&-
for i in $INTERNAL_IP4_DNS_TEMP ; do
NEW_RESOLVCONF="$NEW_RESOLVCONF
nameserver $i"
done
if [ -n "$CISCO_DEF_DOMAIN" ]; then
NEW_RESOLVCONF="$NEW_RESOLVCONF
search $CISCO_DEF_DOMAIN"
fi
echo "$NEW_RESOLVCONF" > /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_ORIG" ]; 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 "$CISCO_DEF_DOMAIN_ORIG" ]; then
scutil >/dev/null 2>&1 <<-EOF
open
get State:/Network/Service/$TUNDEV/DNS
d.add DomainName $CISCO_DEF_DOMAIN_ORIG
d.add SearchDomains * $CISCO_DEF_DOMAIN_ORIG
d.add SupplementalMatchDomains * $CISCO_DEF_DOMAIN_ORIG
set State:/Network/Service/$TUNDEV/DNS
close
EOF
fi
;;
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}' | 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 * ${SERVICE_DNS##$INTERNAL_IP4_DNS}
set State:/Network/Service/$SERVICE/DNS
close
EOF
fi
fi
;;
esac
fi
}
# === resolv.conf handling via /sbin/netconfig (Suse 11.1) =====================
# Suse provides a script that modifies resolv.conf. Use it because it will
# restart/reload all other services that care about it (e.g. lwresd). [unclear if this is still true, but probably --mlk]
modify_resolvconf_suse_netconfig()
{
/sbin/netconfig modify -s vpnc -i "$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
domain $CISCO_DEF_DOMAIN"
fi
echo "$NEW_RESOLVCONF" | /sbin/resolvconf -a $TUNDEV
}
restore_resolvconf_manager() {
/sbin/resolvconf -d $TUNDEV
}
# === resolv.conf handling via unbound =========
modify_resolvconf_unbound() {
if [ -n "$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 ${CISCO_DEF_DOMAIN}
fi
}
restore_resolvconf_unbound() {
if [ -n "$CISCO_DEF_DOMAIN" ]; then
/usr/sbin/unbound-control forward_remove +i ${CISCO_DEF_DOMAIN}
/usr/sbin/unbound-control flush_zone ${CISCO_DEF_DOMAIN}
/usr/sbin/unbound-control flush_requestlist
fi
}
# ========= Toplevel state handling =======================================
kernel_is_2_6_or_above() {
case `uname -r` in
1.*|2.[012345]*)
return 1
;;
*)
return 0
;;
esac
}
do_pre_init() {
if [ "$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
# fix for broken devfs in kernel 2.6.x
if [ "`readlink /dev/net/tun`" = misc/net/tun \
-a ! -e /dev/net/misc/net/tun -a -e /dev/misc/net/tun ] ; then
ln -sf /dev/misc/net/tun /dev/net/tun
fi
# 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
if kernel_is_2_6_or_above ; then
for x in `seq 100` ; do
(exec 6<> /dev/net/tun) > /dev/null 2>&1 && break;
sleep 0.1
done
fi
fi
elif [ "$OS" = "FreeBSD" ]; then
if ! kldstat -q -m if_tun > /dev/null; then
kldload if_tun
fi
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
set_vpngateway_route
do_ifconfig
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"
else
set_default_route
fi
i=`expr $i + 1`
done
for i in $INTERNAL_IP4_DNS ; do
echo "$i" | grep : >/dev/null || \
set_network_route "$i" "255.255.255.255" "32"
done
elif [ -n "$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 [ $NETMASKLEN -lt 128 ]; then
set_ipv6_network_route "$NETWORK" "$NETMASKLEN"
else
set_ipv6_default_route
fi
i=`expr $i + 1`
done
for i in $INTERNAL_IP4_DNS ; do
if echo "$i" | grep : >/dev/null; then
set_ipv6_network_route "$i" "128"
fi
done
elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
set_ipv6_default_route
fi
if [ -n "$CISCO_SPLIT_EXC" ]; then
i=0
LOCALGATEWAY=`tail -n1 "$DEFAULT_ROUTE_FILE"`
echo "Local gateway: $LOCALGATEWAY"
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}"
# FIXME: This doesn't exclude the defualt route, i.e split-tunneling.
# not sure if this is needed or not
if [ "$NETWORK" != "0.0.0.0" ]; then
set_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$LOCALGATEWAY"
fi
i=`expr $i + 1`
done
fi
if [ -n "$INTERNAL_IP4_DNS" ]; then
$MODIFYRESOLVCONF
fi
}
do_disconnect() {
if [ -s "$DEFAULT_ROUTE_FILE" ]; then
ORIGINAL_GW=`cat "$DEFAULT_ROUTE_FILE"`
fi
if [ -n "$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 [ "$NETWORK" != "0.0.0.0" ]; then
del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN"
else
reset_default_route
fi
i=`expr $i + 1`
done
for i in $INTERNAL_IP4_DNS ; do
del_network_route "$i" "255.255.255.255" "32"
done
# else
# reset_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 [ $NETMASKLEN -eq 0 ]; then
reset_ipv6_default_route
else
del_ipv6_network_route "$NETWORK" "$NETMASKLEN"
fi
i=`expr $i + 1`
done
for i in $INTERNAL_IP6_DNS ; do
del_ipv6_network_route "$i" "128"
done
elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
reset_ipv6_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}"
if [ "$NETWORK" != "0.0.0.0" ]; then
# FIXME: This doesn't restore previously overwritten
# routes.
del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$ORIGINAL_GW"
fi
i=`expr $i + 1`
done
fi
del_vpngateway_route
if [ -n "$CISCO_SPLIT_EXC" -o ! -n "$CISCO_SPLIT_INC" ]; then
reset_default_route
fi
if [ -n "$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 $TUNDEV
fi
else
if [ -n "$INTERNAL_IP4_ADDRESS" ]; then
ifconfig "$TUNDEV" 0.0.0.0
fi
if [ -n "$INTERNAL_IP6_ADDRESS" ] && [ -z "$INTERNAL_IP6_NETMASK" ]; then
INTERNAL_IP6_NETMASK="$INTERNAL_IP6_ADDRESS/128"
fi
if [ -n "$INTERNAL_IP6_NETMASK" ]; then
ifconfig "$TUNDEV" inet6 del $INTERNAL_IP6_NETMASK
fi
fi
destroy_tun_device
}
#### Main
if [ -z "$reason" ]; then
echo "this script must be called from vpnc" 1>&2
exit 1
fi
case "$reason" in
pre-init)
run_hooks pre-init
do_pre_init
;;
connect)
run_hooks connect
do_connect
run_hooks post-connect
;;
disconnect)
run_hooks disconnect
do_disconnect
run_hooks post-disconnect
;;
reconnect)
run_hooks reconnect
;;
*)
echo "unknown reason '$reason'. Maybe vpnc-script is out of date" 1>&2
exit 1
;;
esac
exit 0
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