#!/bin/bash

dirs=(/sys/class/net/*/device)
#     12345678901234567890123
if [[ ${#dirs} < 24 ]]; then
    echo "hardware network devices not found"
    exit 1
fi

BUS_L=12
ETH_L=0 # calculated dynamically
LINK_L=0 # calculated dynamically
SPEED_L=0 # calculated dynamically
DUPLEX_L=22

OUT=

for ETH in `ls -d /sys/class/net/*/device | awk -F "/" '{print $5}' | sed "s/\([a-z]*\)\([0-9]\+\)/\1.\2/" | sort -n -t . -k 2.1 | sed "s/\.//"`; do

    if [ -d /sys/class/net/$ETH/device/ieee80211 ]; then # WiFi device
        continue
    fi

    ETHTOOL=`ethtool $ETH`
    ETHTOOL_I=`ethtool -i $ETH`

    if [[ $ETHTOOL =~ ^.*(Speed:[[:space:]][!/a-zA-Z0-9]+).*(Duplex:[[:space:]][!a-zA-Z0-9]+).*(Link[[:space:]]detected:[[:space:]][a-zA-Z]+) ]]; then
        SPEED=${BASH_REMATCH[1]}
        DUPLEX=${BASH_REMATCH[2]}
        LINK=${BASH_REMATCH[3]}
    else
        echo "error parse output of \"ethtool\" for $ETH"
        exit 1
    fi

    if [[ $ETHTOOL_I =~ ^driver:[[:space:]]([a-zA-Z0-9]+).*bus-info:[[:space:]]([.:/a-zA-Z0-9]+).* ]]; then
        DRIVER=${BASH_REMATCH[1]}
        BUS=${BASH_REMATCH[2]}
    else
        echo "error parse output of \"ethtool -i\" for $ETH"
        exit 1
    fi

    STR="$ETH ($DRIVER)"
    if [[ ${#STR} > $ETH_L ]]; then
        ETH_L=${#STR}
    fi

    if [[ ${#LINK} > $LINK_L ]]; then
        LINK_L=${#LINK}
    fi

    if [[ ${#SPEED} > $SPEED_L ]]; then
        SPEED_L=${#SPEED}
    fi

    OUT=${OUT}"$BUS,$ETH ($DRIVER),$LINK,$SPEED,$DUPLEX;"

done

if [[ ${#OUT} = 0 ]]; then
    echo "ethernet devices not found"
    exit 1
fi

B_IFS=$IFS
IFS=";"

for LINE in $OUT; do
    if [[ $LINE =~ ([^,]+),([^,]+),([^,]+),([^,]+),([^,]+) ]]; then
        printf "%-${BUS_L}s  %-${ETH_L}s :  %-${LINK_L}s  %-${SPEED_L}s  %-${DUPLEX_L}s\n" "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}" "${BASH_REMATCH[3]}" "${BASH_REMATCH[4]}" "${BASH_REMATCH[5]}"
    fi
done

IFS=$B_IFS

exit 0