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174 lines
5.5 KiB
174 lines
5.5 KiB
#!/bin/sh
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# List of parameters passed through environment
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#* reason -- why this script was called, one of: pre-init connect disconnect
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#* VPNGATEWAY -- vpn gateway address (always present)
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#* TUNDEV -- tunnel device (always present)
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#* INTERNAL_IP4_ADDRESS -- address (always present)
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#* INTERNAL_IP4_MTU -- mtu (often unset)
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#* INTERNAL_IP4_NETMASK -- netmask (often unset)
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#* INTERNAL_IP4_NETMASKLEN -- netmask length (often unset)
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#* INTERNAL_IP4_NETADDR -- address of network (only present if netmask is set)
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#* INTERNAL_IP4_DNS -- list of dns servers
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#* INTERNAL_IP4_NBNS -- list of wins servers
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#* INTERNAL_IP6_ADDRESS -- IPv6 address
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#* INTERNAL_IP6_NETMASK -- IPv6 netmask
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#* INTERNAL_IP6_DNS -- IPv6 list of dns servers
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#* CISCO_DEF_DOMAIN -- default domain name
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#* CISCO_BANNER -- banner from server
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#* CISCO_SPLIT_INC -- number of networks in split-network-list
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#* CISCO_SPLIT_INC_%d_ADDR -- network address
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#* CISCO_SPLIT_INC_%d_MASK -- subnet mask (for example: 255.255.255.0)
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#* CISCO_SPLIT_INC_%d_MASKLEN -- subnet masklen (for example: 24)
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#* CISCO_SPLIT_INC_%d_PROTOCOL -- protocol (often just 0)
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#* CISCO_SPLIT_INC_%d_SPORT -- source port (often just 0)
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#* CISCO_SPLIT_INC_%d_DPORT -- destination port (often just 0)
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#* CISCO_IPV6_SPLIT_INC -- number of networks in IPv6 split-network-list
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#* CISCO_IPV6_SPLIT_INC_%d_ADDR -- IPv6 network address
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#* CISCO_IPV6_SPLIT_INC_$%d_MASKLEN -- IPv6 subnet masklen
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HOOKS_DIR=/etc/openconnect
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# FIXMEs:
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# Section A: route handling
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# 1) The 3 values CISCO_SPLIT_INC_%d_PROTOCOL/SPORT/DPORT are currently being ignored
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# In order to use them, we'll probably need os specific solutions
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# * Linux: iptables -t mangle -I PREROUTING <conditions> -j ROUTE --oif $TUNDEV
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# This would be an *alternative* to changing the routes (and thus 2) and 3)
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# shouldn't be relevant at all)
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# 2) There are two different functions to set routes: generic routes and the
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# default route. Why isn't the defaultroute handled via the generic route case?
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# 3) In the split tunnel case, all routes but the default route might get replaced
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# without getting restored later. We should explicitely check and save them just
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# like the defaultroute
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# 4) Replies to a dhcp-server should never be sent into the tunnel
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# Section B: Split DNS handling
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# 1) Maybe dnsmasq can do something like that
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# 2) Parse dns packets going out via tunnel and redirect them to original dns-server
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do_connect() {
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if [ -n "$CISCO_BANNER" ]; then
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logger -t openconnect "Connect Banner:"
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echo "$CISCO_BANNER" | while read LINE ; do logger -t openconnect "|" "$LINE" ; done
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fi
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proto_init_update "$TUNDEV" 1
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if [ -n "$INTERNAL_IP4_MTU" ]; then
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MTU=$INTERNAL_IP4_MTU
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fi
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if [ -z "$MTU" ]; then
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MTU=1412
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fi
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proto_add_ipv4_address "$INTERNAL_IP4_ADDRESS" 32 "" "$INTERNAL_IP4_ADDRESS"
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if [ -n "$INTERNAL_IP4_NETMASKLEN" ]; then
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proto_add_ipv4_route "$INTERNAL_IP4_NETADDR" "$INTERNAL_IP4_NETMASKLEN"
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fi
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# If the netmask is provided, it contains the address _and_ netmask
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if [ -n "$INTERNAL_IP6_ADDRESS" ] && [ -z "$INTERNAL_IP6_NETMASK" ]; then
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INTERNAL_IP6_NETMASK="$INTERNAL_IP6_ADDRESS/128"
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fi
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if [ -n "$INTERNAL_IP6_NETMASK" ]; then
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addr="${INTERNAL_IP6_NETMASK%%/*}"
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mask="${INTERNAL_IP6_NETMASK##*/}"
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[[ "$addr" != "$mask" ]] && proto_add_ipv6_address "$addr" "$mask"
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fi
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[ -n "$INTERNAL_IP4_DNS" ] && proto_add_dns_server "$INTERNAL_IP4_DNS"
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[ -n "$CISCO_DEF_DOMAIN" ] && proto_add_dns_search "$CISCO_DEF_DOMAIN"
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if [ -n "$CISCO_SPLIT_INC" ]; then
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i=0
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while [ $i -lt $CISCO_SPLIT_INC ] ; do
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eval NETWORK="\${CISCO_SPLIT_INC_${i}_ADDR}"
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eval NETMASK="\${CISCO_SPLIT_INC_${i}_MASK}"
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eval NETMASKLEN="\${CISCO_SPLIT_INC_${i}_MASKLEN}"
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if [ $NETWORK != "0.0.0.0" ]; then
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proto_add_ipv4_route "$NETWORK" "$NETMASKLEN"
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else
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proto_add_ipv4_route "0.0.0.0" 0
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fi
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i=$(($i + 1))
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done
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elif [ -n "$INTERNAL_IP4_ADDRESS" ]; then
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proto_add_ipv4_route "0.0.0.0" 0
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fi
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if [ -n "$CISCO_IPV6_SPLIT_INC" ]; then
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i=0
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while [ $i -lt $CISCO_IPV6_SPLIT_INC ] ; do
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eval NETWORK="\${CISCO_IPV6_SPLIT_INC_${i}_ADDR}"
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eval NETMASKLEN="\${CISCO_IPV6_SPLIT_INC_${i}_MASKLEN}"
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if [ $NETMASKLEN -lt 128 ]; then
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proto_add_ipv6_route "$NETWORK" "$NETMASKLEN"
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else
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proto_add_ipv6_route "::0" 0
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fi
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i=$(($i + 1))
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done
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elif [ -n "$INTERNAL_IP6_NETMASK" -o -n "$INTERNAL_IP6_ADDRESS" ]; then
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proto_add_ipv6_route "::0" 0
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fi
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proto_send_update "$INTERFACE"
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}
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do_disconnect() {
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proto_init_update "$TUNDEV" 0
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proto_send_update "$INTERFACE"
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}
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#### Hooks
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run_hooks() {
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HOOK="$1"
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if [ -d ${HOOKS_DIR}/${HOOK}.d ]; then
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for script in ${HOOKS_DIR}/${HOOK}.d/* ; do
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[ -f $script ] && . $script
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done
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fi
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}
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#### Main
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if [ -z "$reason" ]; then
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logger -t openconnect "this script must be called from vpnc" 1>&2
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exit 1
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fi
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if [ -z "$INTERFACE" ]; then
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logger -t openconnect "this script must be called for an active interface"
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exit 1
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fi
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. /lib/netifd/netifd-proto.sh
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case "$reason" in
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pre-init)
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run_hooks pre-init
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;;
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connect)
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run_hooks connect
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do_connect
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run_hooks post-connect
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;;
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disconnect)
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run_hooks disconnect
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do_disconnect
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run_hooks post-disconnect
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;;
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reconnect)
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run_hooks reconnect
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;;
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*)
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logger -t openconnect "unknown reason '$reason'. Maybe vpnc-script is out of date" 1>&2
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exit 1
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;;
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esac
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exit 0
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