Stupid code

"""High-level ICMP (fallback)"""
import socket
import os
import struct
import time

ICMP_ECHO_REQUEST = 8
ICMP_ECHO_RESPONSE = 0

def checksum(data: bytearray):
    """ICMP checksum function"""

    if len(data) % 2:

        data += b'\x00'

    total: int = 0

    for i in range(0, len(data), 2):

        w = (data[i] << 8) + data[i + 1]
        total += w

        total = (total & 0xFFFF) + (total >> 16)

    total = ~total & 0xFFFF

    return total

def build_icmp_packet(pid: int, seq: int, data: bytearray = b''):
    """Builds ICMP packets with the correct sum"""

    header = struct.pack('bbHHh', ICMP_ECHO_REQUEST, 0, 0, pid, seq)

    packet = header + data

    chksum = checksum(packet)

    header = struct.pack('bbHHh', ICMP_ECHO_REQUEST, 0, chksum, pid, seq)

    packet = bytearray(header) + data

    return packet

def icmp_ping(data, host, timeout: float):
    """"Basic ICMP response ping"""

    icmp_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP)
    icmp_socket.settimeout(timeout)

    pid = os.getpid() &0xFFFF
    packet = build_icmp_packet(pid, 1, data)

    rt = time.time()


    try:

        host_byname = socket.gethostbyname(host)

        icmp_socket.sendto(packet, (host_byname, 0))

        recv_packet, addr = icmp_socket.recvfrom(1024)
        end_time = (time.time() - rt) * 1000

        print(f"Ping to {host}. RTT: {end_time:.2f}ms\nRecieved: {repr(recv_packet)} from {addr}")

    except socket.timeout as err:

        print(f"Connection to {host} || {host_byname} timed out after {timeout}s. Error: {err}")

    except PermissionError as err:

        print(f"You aren't allowed, {err}")

    except socket.gaierror as err:

        print(f"Could not resolve the domain {host} || {host_byname}. Error: {err}")

    finally:

        icmp_socket.close()

icmp_ping(bytearray("", encoding="utf-8"), "8.8.8.8", 5)