icmp_header = struct.pack('bbHHh', icmp_type, icmp_code, icmp_checkum, icmp_id, icmp_sequence) icmp_packet = icmp_header + icmp_data icmp_checkum = icmp_checksum(icmp_packet) icmp_header = struct struct.pack('bbHHh', icmp_type, icmp_code, icmp_checkum, icmp_id, icmp_sequence) return icmp_header + icmp_data def recv_icmp_packet(socket, icmp_id): global glb_sig while True: if