--- /dev/null
+#!/bin/sh
+#* reason -- why this script was called, one of: pre-init connect disconnect
+#* VPNGATEWAY -- vpn gateway address (always present)
+#* TUNDEV -- tunnel device (always present)
+#* INTERNAL_IP4_ADDRESS -- address (always present)
+#* 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 serverss
+#* INTERNAL_IP4_NBNS -- list of wins 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)
+
+# 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`"
+
+DEFAULT_ROUTE_FILE=/var/run/vpnc/defaultroute
+RESOLV_CONF_BACKUP=/var/run/vpnc/resolv.conf-backup
+FULL_SCRIPTNAME=/usr/local/sbin/vpnc
+SCRIPTNAME=`basename $FULL_SCRIPTNAME`
+
+# some systems, eg. Darwin & FreeBSD, prune /var/run on boot
+if [ ! -d "/var/run/vpnc" ]; then
+ mkdir -p /var/run/vpnc
+fi
+
+# stupid SunOS: no blubber in /usr/local/bin ... (on stdout)
+IPROUTE="`which ip | grep '^/' 2> /dev/null`"
+
+if [ "$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 [ -x /sbin/resolvconf ]; then # Optional tool on Debian, Ubuntu, Gentoo
+ MODIFYRESOLVCONF=modify_resolvconf_manager
+ RESTORERESOLVCONF=restore_resolvconf_manager
+elif [ -x /sbin/modify_resolvconf ]; then # Mandatory tool on Suse earlier than 11.1
+ MODIFYRESOLVCONF=modify_resolvconf_suse
+ RESTORERESOLVCONF=restore_resolvconf_suse
+else # Generic for any OS
+ MODIFYRESOLVCONF=modify_resolvconf_generic
+ RESTORERESOLVCONF=restore_resolvconf_generic
+fi
+
+# =========== tunnel interface handling ====================================
+
+do_ifconfig() {
+ if [ -n "$INTERNAL_IP4_MTU" ]; then
+ MTU=$INTERNAL_IP4_MTU
+ elif [ -n "$IPROUTE" ]; then
+ DEV=$($IPROUTE route | grep ^default | sed 's/^.* dev \([[:alnum:]-]\+\).*$/\1/')
+ MTU=$(($($IPROUTE link show "$DEV" | grep mtu | sed 's/^.* mtu \([[:digit:]]\+\).*$/\1/') - 88))
+ else
+ MTU=1412
+ fi
+
+ # Point to point interface require a netmask of 255.255.255.255 on some systems
+ ifconfig "$TUNDEV" inet "$INTERNAL_IP4_ADDRESS" $ifconfig_syntax_ptp "$INTERNAL_IP4_ADDRESS" netmask 255.255.255.255 mtu ${MTU} up
+
+ if [ -n "$INTERNAL_IP4_NETMASK" ]; then
+ set_network_route $INTERNAL_IP4_NETADDR $INTERNAL_IP4_NETMASK $INTERNAL_IP4_NETMASKLEN
+ fi
+}
+
+destroy_tun_device() {
+ case "$OS" in
+ NetBSD) # and probably others...
+ ifconfig "$TUNDEV" destroy
+ ;;
+ esac
+}
+
+# =========== route handling ====================================
+
+if [ -n "$IPROUTE" ]; then
+ fix_ip_get_output () {
+ sed 's/cache//;s/metric \?[0-9]\+ [0-9]\+//g;s/hoplimit [0-9]\+//g'
+ }
+
+ 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
+ }
+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"
+ }
+
+ set_default_route() {
+ DEFAULTGW="`get_default_gw`"
+ echo "$DEFAULTGW" > "$DEFAULT_ROUTE_FILE"
+ route $route_syntax_del default
+ route add default $route_syntax_gw "$INTERNAL_IP4_ADDRESS"
+ }
+
+ set_network_route() {
+ NETWORK="$1"
+ NETMASK="$2"
+ NETMASKLEN="$3"
+ del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN"
+ route add -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$INTERNAL_IP4_ADDRESS"
+ }
+
+ reset_default_route() {
+ if [ -s "$DEFAULT_ROUTE_FILE" ]; then
+ route $route_syntax_del default
+ route add default $route_syntax_gw `cat "$DEFAULT_ROUTE_FILE"`
+ rm -f -- "$DEFAULT_ROUTE_FILE"
+ fi
+ }
+
+ del_network_route() {
+ case "$OS" in
+ Linux|NetBSD|Darwin) # and probably others...
+ # routes are deleted automatically on device shutdown
+ return
+ ;;
+ esac
+ NETWORK="$1"
+ NETMASK="$2"
+ NETMASKLEN="$3"
+ route $route_syntax_del -net "$NETWORK" $route_syntax_netmask "$NETMASK" $route_syntax_gw "$INTERNAL_IP4_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 [ $CISCO_SPLIT_INC -lt 1 ]; then
+ # Must override for correct default route
+ # Cannot use multiple DNS matching in this case
+ OVERRIDE_PRIMARY='d.add OverridePrimary # 1'
+ fi
+ fi
+ # Uncomment the following if/fi pair to use multiple
+ # DNS matching when available. When multiple DNS matching
+ # is present, anything reading the /etc/resolv.conf file
+ # directly will probably not work as intended.
+ #if [ -z "$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
+ # next line overrides the default gateway and breaks split routing
+ # d.add Router $INTERNAL_IP4_ADDRESS
+ 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 [ ! -e "$RESOLV_CONF_BACKUP" ]; then
+ return
+ fi
+ grep '^#@VPNC_GENERATED@' /etc/resolv.conf > /dev/null 2>&1 && cat "$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
+ ;;
+ esac
+ fi
+}
+# === 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()
+{
+ 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 $SCRIPTNAME -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()
+{
+ /sbin/modify_resolvconf restore -s vpnc -p $SCRIPTNAME -f $FULL_SCRIPTNAME -e $TUNDEV
+}
+
+# === 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 $TUNDEV
+}
+
+# ========= Toplevel state handling =======================================
+
+kernel_is_2_6_or_above() {
+ case `uname -r` in
+ 1.*|2.[012345]*)
+ return 1
+ ;;
+ *)
+ return 0
+ ;;
+ esac
+}
+
+do_pre_init() {
+ if [ "$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
+ 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 [ "$OS" = "FreeBSD" ]; then
+ if [ ! -e /dev/tun ]; then
+ kldload if_tun
+ fi
+ elif [ "$OS" = "GNU/kFreeBSD" ]; then
+ if [ ! -e /dev/tun ]; then
+ kldload if_tun
+ fi
+ elif [ "$OS" = "NetBSD" ]; then
+ :
+ elif [ "$OS" = "OpenBSD" ]; then
+ :
+ 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 "|" "$LINE" ; done
+ echo
+ fi
+
+ do_ifconfig
+ set_vpngateway_route
+ if [ -n "$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 $INTERNAL_IP4_DNS ; do
+ set_network_route "$i" "255.255.255.255" "32"
+ done
+ else
+ set_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"
+ 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
+
+ del_vpngateway_route
+
+ if [ -n "$INTERNAL_IP4_DNS" ]; then
+ $RESTORERESOLVCONF
+ fi
+ destroy_tun_device
+}
+
+#### Main
+
+if [ -z "$reason" ]; then
+ echo "this script must be called from vpnc" 1>&2
+ exit 1
+fi
+
+case "$reason" in
+ pre-init)
+ do_pre_init
+ ;;
+ connect)
+ do_connect
+ ;;
+ disconnect)
+ do_disconnect
+ ;;
+ *)
+ echo "unknown reason '$reason'. Maybe vpnc-script is out of date" 1>&2
+ exit 1
+ ;;
+esac
+
+exit 0
projects / users / dwmw2 / vpnc-scripts.git / commitdiff