Added subnet routing support

routing.sh

@@ -1 +1,61 @@
-#!/bin/bash
+#!/bin/bash
+
+ROUTE_FILE=routes.txt
+
+VPN_SLICE=vpn-slice
+
+if ! command -v $VPN_SLICE &> /dev/null
+then
+    echo "$VPN_SLICE is not in path"
+
+    if test -f "/usr/local/Cellar/vpn-slice/0.15/bin/vpn-slice"; then
+        echo "Found vpn-slice elsewhere"
+        VPN_SLICE="/usr/local/Cellar/vpn-slice/0.15/bin/vpn-slice"
+    else
+        echo "Please make sure vpn-slice is in path"
+        exit
+    fi
+fi
+
+if [ "$reason" != "connect" ]; then
+  $VPN_SLICE
+  exit
+fi
+
+echo "Setting up routing"
+
+# Add subnet to list
+add_subnet ()
+{
+    IP=${1%/*}
+    S=${1#*/}
+    M=$(( 0xffffffff ^ ((1 << (32-S)) -1) ))
+    MASK="$(( (M>>24) & 0xff )).$(( (M>>16) & 0xff )).$(( (M>>8) & 0xff )).$(( M & 0xff ))"
+	export CISCO_SPLIT_INC_${CISCO_SPLIT_INC}_ADDR=$IP
+    export CISCO_SPLIT_INC_${CISCO_SPLIT_INC}_MASK=$MASK
+    export CISCO_SPLIT_INC_${CISCO_SPLIT_INC}_MASKLEN=$S
+    export CISCO_SPLIT_INC=$(($CISCO_SPLIT_INC + 1))
+
+    echo "Adding subnet $IP with mask $MASK to list"
+}
+
+# Initialize empty split tunnel list
+export CISCO_SPLIT_INC=0
+
+# Delete DNS info provided by VPN server to use internet DNS
+# Comment following line to use DNS beyond VPN tunnel
+unset INTERNAL_IP4_DNS
+
+if test -f "$ROUTE_FILE"; then
+    echo "Loading subnets from $ROUTE_FILE"
+    while read p; do
+        case "$p" in \#*) continue ;; esac
+        add_subnet $p
+    done <$ROUTE_FILE
+
+else
+    echo "$ROUTE_FILE does not exist. This should not happen."
+fi
+
+# Load default script
+$VPN_SLICE -S