#!/bin/bash

if [ $# -ne 1 ]; then
        echo "usage: kp [port]"
        exit 1
fi

NODE_PID=$(ss -lptn "sport = :$1" | grep -o 'pid=[0-9]\+' | cut -d '=' -f 2)

if [ -z $NODE_PID ]; then
        echo "No process using $1 Found"
        exit 0
fi

LAST1_PID=$NODE_PID
LAST2_PID=

while true; do
        PARENT_INFO=$(ps -o ppid=,cmd= -p $LAST1_PID | xargs)
        PARENT_PID=$(echo "$PARENT_INFO" | cut -d ' ' -f 1)
        PARENT_CMD=$(echo "$PARENT_INFO" | cut -d ' ' -f 2-)

        echo "Found parent process $PARENT_PID with command $PARENT_CMD"

        if echo "$PARENT_CMD" | grep sh > /dev/null; then
                echo "Found shell process, killing the grandchild ($LAST2_PID)"
                kill $LAST2_PID
                exit 0
        else
                LAST2_PID=$LAST1_PID
                LAST1_PID=$PARENT_PID
        fi
done