# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.


"""
Test cases for twisted.protocols.ident module.
"""

import struct

from twisted.protocols import ident
from twisted.python import failure
from twisted.internet import error
from twisted.internet import defer
from twisted.python.compat import NativeStringIO

from twisted.trial import unittest
from twisted.test.proto_helpers import StringTransport


try:
    import builtins
except ImportError:
    import __builtin__ as builtins



class ClassParserTests(unittest.TestCase):
    """
    Test parsing of ident responses.
    """

    def setUp(self):
        """
        Create an ident client used in tests.
        """
        self.client = ident.IdentClient()


    def test_indentError(self):
        """
        'UNKNOWN-ERROR' error should map to the L{ident.IdentError} exception.
        """
        d = defer.Deferred()
        self.client.queries.append((d, 123, 456))
        self.client.lineReceived('123, 456 : ERROR : UNKNOWN-ERROR')
        return self.assertFailure(d, ident.IdentError)


    def test_noUSerError(self):
        """
        'NO-USER' error should map to the L{ident.NoUser} exception.
        """
        d = defer.Deferred()
        self.client.queries.append((d, 234, 456))
        self.client.lineReceived('234, 456 : ERROR : NO-USER')
        return self.assertFailure(d, ident.NoUser)


    def test_invalidPortError(self):
        """
        'INVALID-PORT' error should map to the L{ident.InvalidPort} exception.
        """
        d = defer.Deferred()
        self.client.queries.append((d, 345, 567))
        self.client.lineReceived('345, 567 :  ERROR : INVALID-PORT')
        return self.assertFailure(d, ident.InvalidPort)


    def test_hiddenUserError(self):
        """
        'HIDDEN-USER' error should map to the L{ident.HiddenUser} exception.
        """
        d = defer.Deferred()
        self.client.queries.append((d, 567, 789))
        self.client.lineReceived('567, 789 : ERROR : HIDDEN-USER')
        return self.assertFailure(d, ident.HiddenUser)


    def test_lostConnection(self):
        """
        A pending query which failed because of a ConnectionLost should
        receive an L{ident.IdentError}.
        """
        d = defer.Deferred()
        self.client.queries.append((d, 765, 432))
        self.client.connectionLost(failure.Failure(error.ConnectionLost()))
        return self.assertFailure(d, ident.IdentError)



class TestIdentServer(ident.IdentServer):
    def lookup(self, serverAddress, clientAddress):
        return self.resultValue



class TestErrorIdentServer(ident.IdentServer):
    def lookup(self, serverAddress, clientAddress):
        raise self.exceptionType()



class NewException(RuntimeError):
    pass



class ServerParserTests(unittest.TestCase):
    def testErrors(self):
        p = TestErrorIdentServer()
        p.makeConnection(StringTransport())
        L = []
        p.sendLine = L.append

        p.exceptionType = ident.IdentError
        p.lineReceived('123, 345')
        self.assertEqual(L[0], '123, 345 : ERROR : UNKNOWN-ERROR')

        p.exceptionType = ident.NoUser
        p.lineReceived('432, 210')
        self.assertEqual(L[1], '432, 210 : ERROR : NO-USER')

        p.exceptionType = ident.InvalidPort
        p.lineReceived('987, 654')
        self.assertEqual(L[2], '987, 654 : ERROR : INVALID-PORT')

        p.exceptionType = ident.HiddenUser
        p.lineReceived('756, 827')
        self.assertEqual(L[3], '756, 827 : ERROR : HIDDEN-USER')

        p.exceptionType = NewException
        p.lineReceived('987, 789')
        self.assertEqual(L[4], '987, 789 : ERROR : UNKNOWN-ERROR')
        errs = self.flushLoggedErrors(NewException)
        self.assertEqual(len(errs), 1)

        for port in -1, 0, 65536, 65537:
            del L[:]
            p.lineReceived('%d, 5' % (port,))
            p.lineReceived('5, %d' % (port,))
            self.assertEqual(
                L, ['%d, 5 : ERROR : INVALID-PORT' % (port,),
                    '5, %d : ERROR : INVALID-PORT' % (port,)])


    def testSuccess(self):
        p = TestIdentServer()
        p.makeConnection(StringTransport())
        L = []
        p.sendLine = L.append

        p.resultValue = ('SYS', 'USER')
        p.lineReceived('123, 456')
        self.assertEqual(L[0], '123, 456 : USERID : SYS : USER')


if struct.pack('=L', 1)[0:1] == b'\x01':
    _addr1 = '0100007F'
    _addr2 = '04030201'
else:
    _addr1 = '7F000001'
    _addr2 = '01020304'



class ProcMixinTests(unittest.TestCase):
    line = ('4: %s:0019 %s:02FA 0A 00000000:00000000 '
            '00:00000000 00000000     0        0 10927 1 f72a5b80 '
            '3000 0 0 2 -1') % (_addr1, _addr2)
    sampleFile = ('  sl  local_address rem_address   st tx_queue rx_queue tr '
                  'tm->when retrnsmt   uid  timeout inode\n   ' + line)


    def testDottedQuadFromHexString(self):
        p = ident.ProcServerMixin()
        self.assertEqual(p.dottedQuadFromHexString(_addr1), '127.0.0.1')


    def testUnpackAddress(self):
        p = ident.ProcServerMixin()
        self.assertEqual(p.unpackAddress(_addr1 + ':0277'),
                          ('127.0.0.1', 631))


    def testLineParser(self):
        p = ident.ProcServerMixin()
        self.assertEqual(
            p.parseLine(self.line),
            (('127.0.0.1', 25), ('1.2.3.4', 762), 0))


    def testExistingAddress(self):
        username = []
        p = ident.ProcServerMixin()
        p.entries = lambda: iter([self.line])
        p.getUsername = lambda uid: (username.append(uid), 'root')[1]
        self.assertEqual(
            p.lookup(('127.0.0.1', 25), ('1.2.3.4', 762)),
            (p.SYSTEM_NAME, 'root'))
        self.assertEqual(username, [0])


    def testNonExistingAddress(self):
        p = ident.ProcServerMixin()
        p.entries = lambda: iter([self.line])
        self.assertRaises(ident.NoUser, p.lookup, ('127.0.0.1', 26),
                                                  ('1.2.3.4', 762))
        self.assertRaises(ident.NoUser, p.lookup, ('127.0.0.1', 25),
                                                  ('1.2.3.5', 762))
        self.assertRaises(ident.NoUser, p.lookup, ('127.0.0.1', 25),
                                                  ('1.2.3.4', 763))


    def testLookupProcNetTcp(self):
        """
        L{ident.ProcServerMixin.lookup} uses the Linux TCP process table.
        """
        open_calls = []

        def mocked_open(*args, **kwargs):
            """
            Mock for the open call to prevent actually opening /proc/net/tcp.
            """
            open_calls.append((args, kwargs))
            return NativeStringIO(self.sampleFile)

        self.patch(builtins, 'open', mocked_open)

        p = ident.ProcServerMixin()
        self.assertRaises(ident.NoUser, p.lookup, ('127.0.0.1', 26),
                                                  ('1.2.3.4', 762))
        self.assertEqual([(('/proc/net/tcp',), {})], open_calls)
