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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import time
import random
import socket
from Basis.Logger import logging
def genFlag(length: int = 12) -> str: # generate random task flag
flag = ''
for i in range(0, length):
tmp = random.randint(0, 15)
if tmp >= 10:
flag += chr(tmp + 87) # a ~ f
else:
flag += str(tmp) # 0 ~ 9
logging.debug('generate new flag -> ' + flag)
return flag
def getAvailablePort(rangeStart: int = 41952, rangeEnd: int = 65535) -> int: # get a available port
if rangeStart > rangeEnd or rangeStart < 1 or rangeEnd > 65535:
raise RuntimeError('invalid port range')
while True:
port = random.randint(rangeStart, rangeEnd) # choose randomly
if checkPortStatus(port):
logging.debug('get new port -> %i' % port)
return port
time.sleep(0.1) # wait for 100ms
def checkPortStatus(port: int) -> bool: # check if the port is occupied
ipv4Tcp = None
ipv4Udp = None
ipv6Tcp = None
ipv6Udp = None
try:
ipv4Tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ipv4Udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
ipv4Tcp.bind(('0.0.0.0', port))
ipv4Udp.bind(('0.0.0.0', port))
ipv4Tcp.close()
ipv4Udp.close()
ipv6Tcp = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
ipv6Udp = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
ipv6Tcp.bind(('::', port))
ipv6Udp.bind(('::', port))
ipv6Tcp.close()
ipv6Udp.close()
logging.debug('check status of port %i -> available' % port)
return True # IPv4 TCP / IPv4 UDP / IPv6 TCP / IPv6 UDP are normal
except:
logging.debug('check status of port %i -> occupied' % port)
return False
finally: # close socket
try:
ipv4Tcp.close()
except: pass
try:
ipv4Udp.close()
except: pass
try:
ipv6Tcp.close()
except: pass
try:
ipv6Udp.close()
except: pass