@ -2,7 +2,7 @@
#
# Originally part of vpnc source code:
# © 2005-2012 Maurice Massar, Jörg Mayer, Antonio Borneo et al.
# © 2009-2012 David Woodhouse <dwmw2@infradead.org>
# © 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
@ -21,31 +21,38 @@
################
#
# 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)
#* 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_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_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)
#* CISCO_SPLIT_INC_%d_SPORT -- source port (often just 0)
#* CISCO_SPLIT_INC_%d_DPORT -- destination port (often just 0)
#* 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_$%d_MASKLEN -- IPv6 subnet masklen
#
# The split tunnel variables above have *_EXC* counterparts for network
# addresses to be excluded from the VPN tunnel.
# FIXMEs:
@ -59,17 +66,22 @@
# 2) There are two different functions to set routes: generic routes and the
# default route. Why isn't the defaultroute handled via the generic route case?
# 3) In the split tunnel case, all routes but the default route might get replaced
# without getting restored later. We should explicite ly check and save them just
# without getting restored later. We should explicitly check and save them just
# like the defaultroute
# 4) Replies to a dhcp-server should never be sent into the tunnel
# Section B: Split DNS handling
# 1) Maybe dnsmasq can do something like that
# 2) Parse dns packets going out via tunnel and redirect them to original dns-server
# 2) Parse DNS packets going out via tunnel and redirect them to original DNS-server
# ======== For test logging (CI/CD will uncomment automatically) =========
#env | sort
#set -x
#TRACE# echo "------------------"
#TRACE# echo "vpnc-script environment:"
#TRACE# env | grep -E '^(CISCO_|INTERNAL_IP|VPNGATEWAY|TUNDEV|IDLE_TIMEOUT|reason)' | sort
#TRACE# echo "------------------"
#TRACE# set -x
# =========== script (variable) setup ====================================
@ -78,8 +90,22 @@ PATH=/sbin:/usr/sbin:$PATH
OS="`uname -s`"
HOOKS_DIR=/etc/vpnc
DEFAULT_ROUTE_FILE=/var/run/vpnc/defaultroute
RESOLV_CONF_BACKUP=/var/run/vpnc/resolv.conf-backup
# 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 cmd= -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 $0`
# some systems, eg. Darwin & FreeBSD, prune /var/run on boot
@ -88,9 +114,6 @@ if [ ! -d "/var/run/vpnc" ]; then
[ -x /sbin/restorecon ] && /sbin/restorecon /var/run/vpnc
fi
# stupid SunOS: no blubber in /usr/local/bin ... (on stdout)
IPROUTE="`which ip 2> /dev/null | grep '^/'`"
if ifconfig --help 2>&1 | grep BusyBox > /dev/null; then
ifconfig_syntax_inet=""
else
@ -98,15 +121,31 @@ else
fi
if [ "$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"
@ -116,34 +155,50 @@ else
ifconfig_syntax_ptpv6=""
fi
grep ^hosts /etc/nsswitch.conf|grep resolve >/dev/null 2>&1
RESOLVEDENABLED=0
grep '^hosts' /etc/nsswitch.conf 2>/dev/null|grep resolve >/dev/null 2>&1
if [ $? = 0 ];then
RESOLVEDENABLED=1
else
RESOLVEDENABLED=0
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
. /etc/functions.sh
include /lib/network
MODIFYRESOLVCONF=modify_resolvconf_openwrt
RESTORERESOLVCONF=restore_resolvconf_openwrt
elif [ -x /usr/bin/busctl ] && [ ${RESOLVEDENABLED} = 1 ]; then # For systemd-resolved (version 229 and above)
elif [ -x /usr/bin/resolvectl ] && [ ${RESOLVEDENABLED} = 1 ]; then
# For systemd-resolved (version 239 and above)
MODIFYRESOLVCONF=modify_resolved_manager
RESTORERESOLVCONF=restore_resolved_manager
elif [ -x /sbin/resolvconf -a "$(basename $(readlink /sbin/resolvconf))" != 'resolvectl' ]; then
# Optional tool on Debian, Ubuntu, Gentoo and FreeBSD
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 ]; then # tool on Suse after 11.1
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
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
@ -156,9 +211,9 @@ run_hooks() {
HOOK="$1"
if [ -d ${HOOKS_DIR}/${HOOK}.d ]; then
for script in ${HOOKS_DIR}/${HOOK}.d/* ; do
[ -f $script ] && . $script
done
for script in ${HOOKS_DIR}/${HOOK}.d/* ; do
[ -f $script ] && . $script
done
fi
}
@ -188,75 +243,116 @@ do_ifconfig() {
fi
if [ -n "$INTERNAL_IP4_NETMASK" ]; then
set_network_route $INTERNAL_IP4_NETADDR $INTERNAL_IP4_NETMASK $INTERNAL_IP4_NETMASKLEN
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="$INTERNAL_IP6_ADDRESS/128"
INTERNAL_IP6_NETMASK="$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 $MTU up
fi
if [ -n "$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 $MTU up
fi
fi
}
destroy_tun_device() {
case "$OS" in
NetBSD|OpenBSD) # and probably others...
ifconfig "$TUNDEV" destroy
;;
FreeBSD)
ifconfig "$TUNDEV" destroy > /dev/null 2>&1 &
;;
esac
}
# =========== route handling ====================================
if [ -n "$IPROUTE" ]; then
fix_ip_get_output () {
sed -e 's/ /\n/g' | \
sed -ne '1p;/via/{N;p};/dev/{N;p};/src/{N;p};/mtu/{N;p}'
sed -ne "1 s|\$|${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() {
$IPROUTE route add `$IPROUTE route get "$VPNGATEWAY" | fix_ip_get_output`
$IPROUTE route flush cache
# We'll attempt to add a host route to the gateway through every route that matches
# its address (excluding those through TUNDEV because the goal is to avoid loopback).
echo "$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
$IPROUTE $FAMILY route flush cache 2>/dev/null
}
del_vpngateway_route() {
$IPROUTE route $route_syntax_del "$VPNGATEWAY"
$IPROUTE route flush cache
$IPROUTE route flush cache 2>/dev/null
}
set_default_route() {
$IPROUTE route | grep '^default' | fix_ip_get_output > "$DEFAULT_ROUTE_FILE"
$IPROUTE route replace default dev "$TUNDEV"
$IPROUTE route flush cache
$IPROUTE route flush cache 2>/dev/null
}
set_network_route() {
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
$IPROUTE route replace "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE route flush cache
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
$IPROUTE route flush cache 2>/dev/null
}
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"
echo "$1" | grep -q : && FAMILY=-6 || FAMILY=-4
list_non_loopback_routes "$NETWORK/$NETMASKLEN" |
while read LINE ; do
$IPROUTE $FAMILY route add `echo "$NETWORK/$NETMASKLEN $LINE" | fix_ip_get_output` 2>/dev/null
done
$IPROUTE $FAMILY route flush cache 2>/dev/null
}
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"
$IPROUTE route flush cache 2>/dev/null
}
reset_default_route() {
if [ -s "$DEFAULT_ROUTE_FILE" ]; then
$IPROUTE route replace `cat "$DEFAULT_ROUTE_FILE"`
$IPROUTE route flush cache
$IPROUTE route flush cache 2>/dev/null
rm -f -- "$DEFAULT_ROUTE_FILE"
fi
}
@ -265,48 +361,82 @@ if [ -n "$IPROUTE" ]; then
NETWORK="$1"
NETMASK="$2"
NETMASKLEN="$3"
$IPROUTE route $route_syntax_del "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE route flush cache
NETDEV="$4"
$IPROUTE route $route_syntax_del "$NETWORK/$NETMASKLEN" dev "$NETDEV"
$IPROUTE route flush cache 2>/dev/null
}
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
$IPROUTE -6 route flush cache 2>/dev/null
}
set_ipv6_network_route() {
NETWORK="$1"
NETMASKLEN="$2"
$IPROUTE -6 route replace "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE route flush cache
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 route flush cache
$IPROUTE -6 route flush cache 2>/dev/null
}
del_ipv6_network_route() {
NETWORK="$1"
NETMASKLEN="$2"
$IPROUTE -6 route del "$NETWORK/$NETMASKLEN" dev "$TUNDEV"
$IPROUTE -6 route flush cache
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() {
# 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; }'
# 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 $TUNDEV (we don't want loopback)
netstat -r -n | awk '/:/ { next; } /link#/ { next; } /[[:space:]]'"$TUNDEV"'([[:space:]]|$)/ { next; } /^(default|0\.0\.0\.0([[:space:]]|\/0))/ { print $2; exit; }'
}
set_vpngateway_route() {
route add -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`"
# Unlike with iproute2, there is no way to determine which current
# route(s) match the VPN gateway, so we simply find a default
# route and use its gateway.
case "$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() {
route $route_syntax_del -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`"
case "$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() {
@ -320,8 +450,36 @@ else # use route command
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" $route_syntax_interface
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() {
@ -333,38 +491,95 @@ else # use route command
}
del_network_route() {
case "$OS" in
Linux|NetBSD|OpenBSD|Darwin|SunOS) # 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"
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 : $2); } }'
}
set_ipv6_default_route() {
route add -inet6 default "$INTERNAL_IP6_ADDRESS" $route_syntax_interface
DEFAULTGW="`get_ipv6_default_gw`"
echo "$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="$2"
route add -inet6 -net "$NETWORK/$NETMASK" "$INTERNAL_IP6_ADDRESS" $route_syntax_interface
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() {
route $route_syntax_del -inet6 default "$INTERNAL_IP6_ADDRESS"
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"
route $route_syntax_del -inet6 "$NETWORK/$NETMASK" "$INTERNAL_IP6_ADDRESS"
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"
:
}
@ -578,7 +793,7 @@ nameserver $i"
done
if [ -n "$CISCO_DEF_DOMAIN" ]; then
NEW_RESOLVCONF="$NEW_RESOLVCONF
domain $CISCO_DEF_DOMAIN"
search $CISCO_DEF_DOMAIN"
fi
echo "$NEW_RESOLVCONF" | /sbin/resolvconf -a $TUNDEV
}
@ -614,6 +829,14 @@ busctl_set_nameservers() {
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
@ -626,7 +849,25 @@ busctl_set_search() {
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 $INTERNAL_IP4_DNS
@ -636,6 +877,12 @@ modify_resolved_manager() {
}
restore_resolved_manager() {
local if_index
if_index=$(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
@ -659,30 +906,24 @@ restore_resolvconf_unbound() {
fi
}
# ========= Toplevel state handling ============================== =========
# === resolv.conf handling via resolvd =========
kernel_is_2_6_or_above() {
case `uname -r` in
1.*|2.[012345]*)
return 1
;;
*)
return 0
;;
esac
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
# 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
@ -690,18 +931,12 @@ do_pre_init() {
[ -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
for x in $(seq 100) ; do
(exec 6<> /dev/net/tun) > /dev/null 2>&1 && break;
sleep 0.1
done
fi
elif [ "$OS" = "FreeBSD" ]; then
if ! kldstat -q -m if_tun > /dev/null; then
kldload if_tun
fi
elif [ "$OS" = "FreeBSD" -o "$OS" = "DragonFly" ]; then
if ! ifconfig $TUNDEV > /dev/null; then
ifconfig $TUNDEV create
fi
@ -730,8 +965,34 @@ do_connect() {
echo
fi
set_vpngateway_route
case "$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 $CISCO_SPLIT_INC ] ; do
@ -739,7 +1000,7 @@ do_connect() {
eval NETMASK="\${CISCO_SPLIT_INC_${i}_MASK}"
eval NETMASKLEN="\${CISCO_SPLIT_INC_${i}_MASKLEN}"
if [ "$NETWORK" != "0.0.0.0" ]; then
set_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN"
set_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$TUNDEV"
else
set_default_route
fi
@ -747,7 +1008,7 @@ do_connect() {
done
for i in $INTERNAL_IP4_DNS ; do
echo "$i" | grep : >/dev/null || \
set_network_route "$i" "255.255.255.255" "32"
set_network_route "$i" "255.255.255.255" "32" "$TUNDEV"
done
elif [ -n "$INTERNAL_IP4_ADDRESS" ]; then
set_default_route
@ -757,16 +1018,16 @@ do_connect() {
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
if [ $NETMASKLEN -eq 0 ]; then
set_ipv6_default_route
else
set_ipv6_network_route "$NETWORK" "$NETMASKLEN" "$TUNDEV"
fi
i=`expr $i + 1`
done
for i in $INTERNAL_IP4_DNS ; do
if echo "$i" | grep : >/dev/null; then
set_ipv6_network_route "$i" "128"
set_ipv6_network_route "$i" "128" "$TUNDEV"
fi
done
elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
@ -788,18 +1049,41 @@ do_disconnect() {
if [ "$NETWORK" != "0.0.0.0" ]; then
# FIXME: This doesn't restore previously overwritten
# routes.
del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN"
del_network_route "$NETWORK" "$NETMASK" "$NETMASKLEN" "$TUNDEV"
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"
del_network_route "$i" "255.255.255.255" "32" "$TUNDEV"
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
@ -808,12 +1092,12 @@ do_disconnect() {
if [ $NETMASKLEN -eq 0 ]; then
reset_ipv6_default_route
else
del_ipv6_network_route "$NETWORK" "$NETMASKLEN"
del_ipv6_network_route "$NETWORK" "$NETMASKLEN" "$TUNDEV"
fi
i=`expr $i + 1`
done
for i in $INTERNAL_IP6_DNS ; do
del_ipv6_network_route "$i" "128"
del_ipv6_network_route "$i" "128" "$TUNDEV"
done
elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
reset_ipv6_default_route
@ -837,19 +1121,32 @@ do_disconnect() {
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" 0.0.0.0
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" inet6 del $INTERNAL_IP6_NETMASK
ifconfig "$TUNDEV" `ifconfig_syntax_del "$INTERNAL_IP6_NETMASK"`
fi
ifconfig "$TUNDEV" down
fi
destroy_tun_device
case "$OS" in
NetBSD|OpenBSD) # and probably others...
ifconfig "$TUNDEV" destroy
;;
FreeBSD|DragonFly)
ifconfig "$TUNDEV" destroy > /dev/null 2>&1 &
;;
esac
}
do_attempt_reconnect() {
set_vpngateway_route
}
#### Main
@ -874,7 +1171,17 @@ case "$reason" in
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
;;
*)
Nikos Mavrogiannopoulos
2 years ago