Python 3.4.3 socket.sendto

我在Windows 7和Python 3.4.3版本上運行以下代碼時遇到了一些麻煩。該代碼是：Python 3.4.3 socket.sendto

import socket 
import sys 

class TraceRoute(object): 

    BADDR = "0.0.0.0" # default bind address - (all IPs) 
    PORT = 33434 # default port 
    ICMP = socket.getprotobyname('icmp') 
    UDP = socket.getprotobyname('udp') 

    desternation = "" 
    ttl = 0 # we inrecement this by one each time.  

    # sockets 
    reciever = None 
    sender = None 

    # finished? 
    finished = False 

    def __init__(self, desternation): 
     self.desternation = socket.gethostbyname(desternation) 

     self.reciever = socket.socket(socket.AF_INET, socket.SOCK_RAW, self.ICMP) 
     self.sender = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, self.UDP) 

     # bind to reciever so we can listen for replies 
     self.reciever.bind((self.BADDR, self.PORT)) 

    def next_server(self): 
     """ Connects to next server 1 hop away from current server (i.e. server[ttl + 1]) """ 
     if self.finished: 
      # we have nothing to do, just return 
      return 

     # first job increment the ttl on the socket 
     self.ttl += 1 
     self.sender.setsockopt(socket.SOL_IP, socket.IP_TTL, self.ttl) 

     self.sender.sendto(bytes("", "UTF-8"), (self.desternation, self.PORT)) 
     current_server = self.reciever.recvfrom(512)[1][0] # get 512 bytes from the reciever 
     self.display(current_server) 

     if current_server == self.desternation: 
      self.finished = True 

    def display(self, address): 
     """ Gets the hostname (if we can) and displays """ 
     try: 
      name = socket.gethostbyaddr(address)[0] 
      print "%s) %s (%s)" % (self.ttl, name, address) 
     except socket.error: 
      # we couldn't - we'll just tell them the IP address 
      print "%s) %s" % (self.ttl, address) 

    def __del__(self): 
     """ Be good and close our sockets """ 
     try: 
      self.reciever.close() 
     except socket.error: 
      # already closed 
      pass 

     try: 
      self.sender.close() 
     except socket.error: 
      # already closed 
      pass 

if __name__ == "__main__": 
    # lets get the address from the commandline args 
    if len(sys.argv) <= 1: 
     # nothing been specified 
     print "You need to give an address" 
     print "%s <server>" % sys.argv[0] 
     sys.exit() # we can't do anything. 

    tracert = TraceRoute(sys.argv[1]) 
    while not tracert.finished: 
     tracert.next_server()

一旦我開始腳本什麼也沒有發生，它看起來像它在無限循環。停止它的唯一方法是使用CTRL + BREAK組合鍵。任何形式的幫助都是值得歡迎的。在此先感謝Tomislav。

來源

2016-01-26 Beller0ph0n

等待ICMP應答時，您沒有任何超時：

current_server = self.reciever.recvfrom(512)[1][0] # get 512 bytes from the reciever

你不應該想當然地認爲你的路徑的每個節點將啓用ICMP回覆。

此外，您的腳本完成條件似乎有缺陷。當你從目的地獲得ICMP回覆時，你將設置tracert.finished爲true。當您發送UDP ping數據包時，爲什麼您的目的地會使用ICMP回覆您？

編輯：如果你要更多地使用網絡編程我強烈建議你下載並學習Wireshark。

來源

2016-01-26 08:34:43 jpou

Python 3.4.3 socket.sendto

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