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我正在尝试使用异步调度程序（下面的代码）通过数据包套接字对发送/接收进行原型类型。尽管我的 handle_write 方法被迅速调用，但 handle_read 方法似乎没有被调用。loop() 确实经常调用可读方法，但我无法接收任何内容。我知道在 eth0 上收到了数据包，因为一个简单的 tcpdump 会显示传入的数据包。我错过了什么吗？



#!/usr/bin/python

import asyncore, socket, IN, struct

class packet_socket(asyncore.dispatcher):

    def __init__(self):
        asyncore.dispatcher.__init__(self)
        self.create_socket(socket.AF_PACKET, socket.SOCK_RAW)
        self.buffer = '0180C20034350012545900040060078910'
        self.socket.setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,struct.pack("%ds" % (len("eth0")+1,), "eth0"))

    def handle_close(self):
        self.close()

    def handle_connect(self):
        pass

    def handle_read(self):
        print "handle_read() called"
        data,addr=self.recvfrom(1024)
        print data
        print addr

    def readable(self):
        print "Checking read flag"
        return True

    def writable(self):
        return (len(self.buffer) > 0)

    def handle_write(self):
        print "Writing buffer data to the socket"
        sent = self.sendto(self.buffer,("eth0",0xFFFF))
        self.buffer = self.buffer[sent:]

c = packet_socket()

asyncore.loop()

提前致谢。

4

1 回答 1

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我终于在同事的帮助下完成了这项工作。这与将协议参数传递给create_socket()方法有关。不幸create_socket() 的是，调度程序没有采用第三个参数 - 所以我不得不修改我的packet_socket()构造函数以采用预先创建的带有协议的套接字ETH_P_ALL（或您希望接收的任何协议类型）作为参数。编辑代码如下：



#!/usr/bin/python

import asyncore, socket, IN, struct

proto=3
s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(3))
s.bind(("eth0",proto))

class packet_socket(asyncore.dispatcher):

    def __init__(self,sock):
        asyncore.dispatcher.__init__(self,sock)
        #self.create_socket(socket.AF_PACKET, socket.SOCK_RAW,socket.htons(3))
        self.buffer = '0180C20034350012545900040060078910'
        self.socket.setsockopt(socket.SOL_SOCKET,IN.SO_BINDTODEVICE,struct.pack("%ds" % (len("eth0")+1,), "eth0"))

    def handle_close(self):
        self.close()

    def handle_connect(self):
        pass

    def handle_read(self):
        print "handle_read() called" 
    data,addr=self.recvfrom(1024)
        print data
        print addr

    def readable(self):
        print "Checking read flag" 
    return True

    def writable(self):
        return (len(self.buffer) > 0)

    def handle_write(self):
        print "Writing buffer data to the socket" 
    sent = self.sendto(self.buffer,("eth0",0xFFFF))
        self.buffer = self.buffer[sent:]

c = packet_socket(s)

asyncore.loop()

谢谢，

于 2009-04-06T20:22:06.743 回答