#!/bin/bash
#Syn-3 Interface assign script.

#path to configfile
#<MAC>\t<INTERFACE>
CONFIG_FILE=/mnt/if-assign.conf;


#shut all interfaces down and move them out of the way
for NET in /sys/class/net/eth*/address; do
	INTERFACE="`echo $NET|cut -f5 -d/`";
	if [ "`cat /sys/class/net/$INTERFACE/type`" == "1" ]; then
		MAC="`cat $NET`";
		ifconfig "$INTERFACE" down
		nameif "tmp_$INTERFACE" "$MAC"
	fi
done

#first, if we have a config, rename interfaces that have an explicit mac assignment
if [ -e $CONFIG_FILE ]; then
	for NET in /sys/class/net/tmp_eth*/address; do
		INTERFACE="`echo $NET|cut -f5 -d/`";
		if [ "`cat /sys/class/net/$INTERFACE/type`" == "1" ]; then
			MAC="`cat $NET`";
			NEW_INTERFACE="`grep -i "^$MAC" $CONFIG_FILE |head -1|cut -f2`"  2>/dev/null
			if [ "$NEW_INTERFACE" ]; then
				echo "Assigning known adaptor $MAC to interface $NEW_INTERFACE."
				nameif "$NEW_INTERFACE" "$MAC"
			fi
		fi
	done
fi

#now rename the unknown adapters in ORDER of macadres.
#this will guarantee consistency. in some complex setups, interfaces seem to be assigned at random/detection speed.
#after booting this assignment will be stored permanently and can be changed by the user.
IF_COUNTER=0
for MAC in `cat /sys/class/net/tmp_eth*/address 2>/dev/null|sort`; do
	NET=`grep -l $MAC /sys/class/net/tmp_eth*/address 2>/dev/null`
	INTERFACE="`echo $NET|cut -f5 -d/`";

	#determine next available eth number
	while true; do
		NEW_INTERFACE=eth$IF_COUNTER
		if ! [ -e /sys/class/net/$NEW_INTERFACE ]; then
			echo "Assigning new adaptor $MAC to interface $NEW_INTERFACE"
			nameif "$NEW_INTERFACE" "$MAC"
			break;
		fi
		IF_COUNTER=$(( IF_COUNTER+1 ))
	done
done