read-proc-tcp

#!/bin/bash


# Developed for Linux
# License:		GNU GPL v.3
# Version:		1
# Destiny:		Script for translate part of file /proc/net/tcp
# Script usage: bash script


#	https://stackoverflow.com/questions/31158397/find-the-network-address-from-proc
#	https://blog.oddbit.com/post/2015-03-08-converting-hexadecimal-ip-addr/


# Check root running
[[ $EUID -ne 0 ]] && echo -e "'\e[0;31m' This script must be run as root. '\e[0m'" && exit 1


###########################}
# Check Dependecies - List created automatically by find.bash.dep.sh version=8 
# source=https://github.com/tele1/LinuxScripts
[[ -z $(type -P awk) ]] && DEP="$DEP"$'\n'"awk"
[[ -z $(type -P cat) ]] && DEP="$DEP"$'\n'"cat"
[[ -z $(type -P echo) ]] && DEP="$DEP"$'\n'"echo"
[[ -z $(type -P grep) ]] && DEP="$DEP"$'\n'"grep"
[[ -z $(type -P lsof) ]] && DEP="$DEP"$'\n'"lsof"
[[ -z $(type -P printf) ]] && DEP="$DEP"$'\n'"printf"
[[ -z $(type -P sed) ]] && DEP="$DEP"$'\n'"sed"
[[ -z $(type -P tac) ]] && DEP="$DEP"$'\n'"tac"
[[ -z $(type -P tr) ]] && DEP="$DEP"$'\n'"tr"
 
# End script if exist any error
[ -z "$DEP" ] || { echo "   Error: Missing dependencies, before run script please install: $DEP"  ; exit 1  ;}
###########################}


HEX_TO_DEC_ADDRESS() {
HEX_IP=$(awk -F ':' '{print $1}' <<< "$1")
HEX_PORT=$(awk -F ':' '{print $2}' <<< "$1")

DIVIDED_IP=$(sed 's/../\n&/g' <<< "$HEX_IP" | tac)
DEC_IP=''

while read LINE ; do
	# Convert from hexadecimal to decimal
	CONVERT_TO_DECIMAL=$[16#${LINE}]
	DEC_IP="${DEC_IP}.${CONVERT_TO_DECIMAL}"
done <<< "$DIVIDED_IP"

# Without dot at begin
DEC_IP=$(sed 's/^\.//g' <<< "$DEC_IP")

DEC_PORT=$[16#${HEX_PORT}]
#echo "$DEC_PORT"
}


NET_TCP=$(cat /proc/net/tcp)
cat /proc/net/tcp
echo "============"

while read LINE ; do

	#echo "$LINE"
	#	if this is not text / first line
	if $(grep -q ^"sl" <<< "$LINE")  ; then
		echo "  $LINE" | tr ' ' '  '
	else
		#echo "$LINE"

		# Because something will change variable but I need for leter , so I need next variable
		LINE_2="$LINE"
		ARG_1=$(echo "$LINE_2" |  awk '{print $1}')
		HEX_LOCAL_ADDRESS=$(awk -F ' ' '{print $2}' <<< "$LINE")
		HEX_TO_DEC_ADDRESS "$HEX_LOCAL_ADDRESS"
		DEC_LOCAL_ADDRESS="${DEC_IP}:${DEC_PORT}"
		#echo $DEC_LOCAL_ADDRESS


		HEX_REM_ADDRESS=$(awk -F ' ' '{print $3}' <<< "$LINE_2")
		HEX_TO_DEC_ADDRESS "$HEX_REM_ADDRESS"
		DEC_REM_ADDRESS="${DEC_IP}:${DEC_PORT}"
		
		#echo "$ARG_1 ${DEC_LOCAL_ADDRESS} ${DEC_REM_ADDRESS}"
		printf "%4s | %20s -> %20s \n" "$ARG_1" "${DEC_LOCAL_ADDRESS}" "${DEC_REM_ADDRESS}" 

	fi

done <<< "$NET_TCP"

echo "============"
#lsof -i :0-65535
lsof -Pi :0-65535 | grep -v UDP | nl -s:" " -v -1