python检测远程udp端口是否打开详解编程语言

sock_udp = socket.socket(socket.AF_INET,socket.SOCK_DGRAM) sock_udp.sendto("abcd...",ADDR) sock_udp.close() except: pass def icmp_receiver(ip,port): icmp = socket.getprotobyname("icmp") try: sock_icmp = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp) except socket.error, (errno, msg): if errno == 1: # Operation not permitted msg = msg + ( " - Note that ICMP messages can only be sent from processes" " running as root." raise socket.error(msg) raise # raise the original error sock_icmp.settimeout(3) try: recPacket,addr = sock_icmp.recvfrom(64) except: queue.put(True) return icmpHeader = recPacket[20:28] icmpPort = int(recPacket.encode(hex)[100:104],16) head_type, code, checksum, packetID, sequence = struct.unpack( "bbHHh", icmpHeader sock_icmp.close() if code == 3 and icmpPort == port and addr[0] == ip: queue.put(False) return def checker_udp(ip,port): thread_udp = threading.Thread(target=udp_sender,args=(ip,port)) thread_icmp = threading.Thread(target=icmp_receiver,args=(ip,port)) thread_udp.daemon= True thread_icmp.daemon = True thread_icmp.start() time.sleep(0.1) thread_udp.start() thread_icmp.join() thread_udp.join() return queue.get(False) if __name__ == __main__: import sys print checker_udp(sys.argv[1],int(sys.argv[2]))

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