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我制作了一个包含pytun.TunTapDevice的 Tun 类：

from pytun import TunTapDevice

class Tun(object):
    def __init__(self,name='tun',addr=None,dstaddr=None,netmask=None,mtu=None):

        tun = TunTapDevice(name=name)
        if addr     : tun.addr      = addr
        if dstaddr  : tun.dstaddr   = dstaddr
        if netmask  : tun.netmask   = netmask
        if mtu      : tun.mtu       = mtu
        self._tun = tun
        self.up = self._tun.up
        self.down = self._tun.down
        self.read = self._tun.read
        self.write = self._tun.write
        self.close = self._tun.close


    @property
    def name(self):
        return self._tun.name

    @property
    def mtu(self):
        return self._tun.mtu

问题不是关于如何编写隧道，而是关于如何编写测试用例以确保它在使用 python 单元测试的类 unix oses 中正常工作。

我应该写什么来确保它有效？可能是 ARP 请求、ICMP、DNS 数据包或其他任何东西：

class TestTunnel(unittest.TestCase):

    def setUp(self):
        self.tun = Tun(name='tun0', addr='192.168.0.23', netmask='255.255.255.0',mtu=1500)

    def test_tunnel(self):
        self.tun.write(?????)
        self.assertEqual(self.tun.read(),????)

编辑1：

最后我通过这段代码得到了它：

from select import select
import dpkt
import struct

class TunnelTestCase( unittest.TestCase):

    def setUp(self):

        self.tun = Tun(name='testtun',
                       addr='192.168.6.92',
                       dstaddr='192.168.6.93',
                       netmask='255.255.255.0', 
                       mtu=1500)
        self.tun.up()

    def _ip2str(self,ip):
        return '.'.join([str(i) for i in struct.unpack('!BBBB',ip)])

    def test_echo(self):
        reqPack = dpkt.ip.IP('E\x00\x00T\x00\x00@\x00@\x01\xac\x9f\xc0\xa8\x06]\xc0\xa8\x06\\\x08\x00\x1c\xae\t\xc7\x00\x01\x0f\x8adQq\xab\x01\x00\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./01234567')
        self.tun.write(reqPack.pack())

        r,_w,_ex = select([self.tun],[],[],4)
        if len(r) and r[0] == self.tun:
            replyPack = dpkt.ip.IP(self.tun.read())
            self.assertEqual(self._ip2str(replyPack.src), self.tun.addr)
            self.assertEqual(self._ip2str(replyPack.dst), self.tun.dstaddr)
            return

        self.assert_(False, 'ICMP Echo timeout, the tunnel interface may not works properly in your system.')
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1 回答 1

1

您也许可以简单地从 pytun 借用测试用例并简化它们。事实上，我认为测试实际连接性是在他们的包中完成的，所以除非你试图测试一些显着不同的东西，否则你可以不加修改地运行那里的测试。https://github.com/montag451/pytun/tree/master/test

Since it's a raw socket, you can simply try to send a plain ascii message from the client and verify it is received by the server, and then have the server send back an acknowledgement, which you can assert against.

于 2013-04-07T22:53:02.263 回答