Python原始套接字到以太网接口(Windows)

我正在尝试创建DHCP服务器,第一步是让我通过以太网端口发送数据包.我正在尝试将数据包发送到我的以太网接口,并弹出错误消息.

代码如下.

import socket

def sendeth(src, dst, eth_type, payload, interface = "eth0"):
  """Send raw Ethernet packet on interface."""

  assert(len(src) == len(dst) == 6) # 48-bit ethernet addresses
  assert(len(eth_type) == 2) # 16-bit ethernet type

  #s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
  s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)

  # From the docs: "For raw packet
  # sockets the address is a tuple (ifname, proto [,pkttype [,hatype]])"
  s.bind((interface, 0))
  return s.send(src + dst + eth_type + payload)

if __name__ == "__main__":
  print("Sent %d-byte Ethernet packet on eth0" %
    sendeth("\xFE\xED\xFA\xCE\xBE\xEF",
            "\xFE\xED\xFA\xCE\xBE\xEF",
            "\x7A\x05",
            "hello"))

我在创建套接字的方式时遇到问题. AF_PACKET无法识别,因此我假设仅适用于Linux.我将其注释掉并在其下方添加了新行.我再次运行它,开始出现如下所示的错误.

Traceback (most recent call last):
  File "eth.py", line 27, in <module>
    "hello"))
  File "eth.py", line 19, in sendeth
    s.bind((interface, 0))
  File "C:\Python27\lib\socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
socket.gaierror: [Errno 11001] getaddrinfo failed

有人知道为什么会这样吗？

解决方法:

DHCP是UDP协议.您不需要原始套接字即可实现DHCP服务器.

使用AF_INET / SOCK_DGRAM套接字,并绑定到地址255.255.255.255,以实现服务器.