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executable file 22 lines (16 sloc) 516 Bytes
#!/usr/bin/env bash
UPSTREAM_IFACE=${1:-en0}
USB_IFACE=''
USB_IP=${2:-10.0.0.1}
for i in $(ifconfig -lu); do
if ifconfig $i | grep -q "${USB_IP}" ; then USB_IFACE=$i; fi;
done
if [ -z "$USB_IFACE" ]
then
echo "can't find usb interface with ip $USB_IP"
exit 1
fi
echo "sharing connecting from upstream interface $UPSTREAM_IFACE to usb interface $USB_IFACE ..."
sysctl -w net.inet.ip.forwarding=1
pfctl -e
echo "nat on ${UPSTREAM_IFACE} from ${USB_IFACE}:network to any -> (${UPSTREAM_IFACE})" | pfctl -f -
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