swi_vmnet_monitor

#!/bin/bash

mkdir -p /Library/Logs/VMWareVMNETMonitor
LOG_FILE="/Library/Logs/VMWareVMNETMonitor/swi_vmnet_monitor.log"

date > $LOG_FILE
debug_echo() {
    echo "$@" >> $LOG_FILE
}

debug_cat() {
    cat "$@" >> $LOG_FILE
}

parse_tuns() {
    debug_echo parse_tuns $1
    ifconfig | grep -i "utun.: flags" | while read -r line ; do
        TUN=$(echo $line | awk '{print $1;}')
        TUN="${TUN%%:*}"
        debug_echo parse_tuns TUN: $TUN
        echo "nat on $TUN inet from $1 to any -> ($TUN) extfilter ei"
    done
}

parse_netmask() {
    debug_echo parse_netmask: $1 $2 $3
    bits=0
    for octet in $(echo $3| sed 's/\./ /g'); do
        binbits=$(echo "obase=2; ibase=10; ${octet}"| bc | sed 's/0//g')
        let bits+=${#binbits}
    done
    echo "${bits}"
}

parse_subnet() {
    debug_echo parse_subnet: $1 $2 $3
    echo $3
}

parse_nets() {
    until [ -z $1 ]; do
        debug_echo parse_nets: $1 $2 $3
        NET=${2:0:6}
        debug_echo parse_nets NET: $NET
        shift; shift; shift
        SUBNET=$(cat /Library/Preferences/VMware\ Fusion/networking | grep $NET"_HOSTONLY_SUBNET")
        SUBNET=$(parse_subnet $SUBNET)
        debug_echo parse_nets SUBNET: $SUBNET
        NETMASK=$(cat /Library/Preferences/VMware\ Fusion/networking | grep $NET"_HOSTONLY_NETMASK")
        NETMASK=$(parse_netmask $NETMASK)
        parse_tuns $SUBNET/$NETMASK
    done
}

reset_pfctl() {
    TEMP_NAME=$(mktemp)
    pfctl -a com.apple.internet-sharing/shared_v4 -s nat 2>/dev/null | grep -e "nat on" -e "no nat" | grep -v utun. > $TEMP_NAME
    NATS=$(cat /Library/Preferences/VMware\ Fusion/networking | grep "_NAT yes")
    debug_echo reset_pfctl
    parse_nets $NATS >> $TEMP_NAME
    if ifconfig | grep -q utun4; then
        debug_echo "add your vpn rules here if any"
        #cat /etc/pf.anchors/forwarding.vpn >> $TEMP_NAME
    fi
    debug_echo reset_pfctl content:
    debug_cat $TEMP_NAME
    pfctl -df $TEMP_NAME
    pfctl -evf $TEMP_NAME
    rm -f $TEMP_NAME
}

debug_echo 1
reset_pfctl
sleep 1

debug_echo 2
reset_pfctl
sleep 1

debug_echo 3
reset_pfctl
sleep 1

debug_echo 4
reset_pfctl
sleep 1

debug_echo 5
reset_pfctl
sleep 1