ssh-audit/test/test_buffer.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import re
import pytest


# pylint: disable=attribute-defined-outside-init,bad-whitespace
class TestBuffer(object):
	@pytest.fixture(autouse=True)
	def init(self, ssh_audit):
		self.rbuf = ssh_audit.ReadBuf
		self.wbuf = ssh_audit.WriteBuf
		self.utf8rchar = b'\xef\xbf\xbd'

	@classmethod
	def _b(cls, v):
		v = re.sub(r'\s', '', v)
		data = [int(v[i * 2:i * 2 + 2], 16) for i in range(len(v) // 2)]
		return bytes(bytearray(data))

	def test_unread(self):
		w = self.wbuf().write_byte(1).write_int(2).write_flush()
		r = self.rbuf(w)
		assert r.unread_len == 5
		r.read_byte()
		assert r.unread_len == 4
		r.read_int()
		assert r.unread_len == 0

	def test_byte(self):
		w = lambda x: self.wbuf().write_byte(x).write_flush()  # noqa
		r = lambda x: self.rbuf(x).read_byte()  # noqa
		tc = [(0x00, '00'),
		      (0x01, '01'),
		      (0x10, '10'),
		      (0xff, 'ff')]
		for p in tc:
			assert w(p[0]) == self._b(p[1])
			assert r(self._b(p[1])) == p[0]

	def test_bool(self):
		w = lambda x: self.wbuf().write_bool(x).write_flush()  # noqa
		r = lambda x: self.rbuf(x).read_bool()  # noqa
		tc = [(True,  '01'),
		      (False, '00')]
		for p in tc:
			assert w(p[0]) == self._b(p[1])
			assert r(self._b(p[1])) == p[0]

	def test_int(self):
		w = lambda x: self.wbuf().write_int(x).write_flush()  # noqa
		r = lambda x: self.rbuf(x).read_int()  # noqa
		tc = [(0x00,       '00 00 00 00'),
		      (0x01,       '00 00 00 01'),
		      (0xabcd,     '00 00 ab cd'),
		      (0xffffffff, 'ff ff ff ff')]
		for p in tc:
			assert w(p[0]) == self._b(p[1])
			assert r(self._b(p[1])) == p[0]

	def test_string(self):
		w = lambda x: self.wbuf().write_string(x).write_flush()  # noqa
		r = lambda x: self.rbuf(x).read_string()  # noqa
		tc = [(u'abc1',  '00 00 00 04 61 62 63 31'),
		      (b'abc2',  '00 00 00 04 61 62 63 32')]
		for p in tc:
			v = p[0]
			assert w(v) == self._b(p[1])
			if not isinstance(v, bytes):
				v = bytes(bytearray(v, 'utf-8'))
			assert r(self._b(p[1])) == v

	def test_list(self):
		w = lambda x: self.wbuf().write_list(x).write_flush()  # noqa
		r = lambda x: self.rbuf(x).read_list()  # noqa
		tc = [(['d', 'ef', 'ault'], '00 00 00 09 64 2c 65 66 2c 61 75 6c 74')]
		for p in tc:
			assert w(p[0]) == self._b(p[1])
			assert r(self._b(p[1])) == p[0]

	def test_list_nonutf8(self):
		r = lambda x: self.rbuf(x).read_list()  # noqa
		src = self._b('00 00 00 04 de ad be ef')
		dst = [(b'\xde\xad' + self.utf8rchar + self.utf8rchar).decode('utf-8')]
		assert r(src) == dst

	def test_line(self):
		w = lambda x: self.wbuf().write_line(x).write_flush()  # noqa
		r = lambda x: self.rbuf(x).read_line()  # noqa
		tc = [(u'example line', '65 78 61 6d 70 6c 65 20 6c 69 6e 65 0d 0a')]
		for p in tc:
			assert w(p[0]) == self._b(p[1])
			assert r(self._b(p[1])) == p[0]

	def test_line_nonutf8(self):
		r = lambda x: self.rbuf(x).read_line()  # noqa
		src = self._b('de ad be af')
		dst = (b'\xde\xad' + self.utf8rchar + self.utf8rchar).decode('utf-8')
		assert r(src) == dst

	def test_bitlen(self):
		# pylint: disable=protected-access
		class Py26Int(int):
			def bit_length(self):
				raise AttributeError
		assert self.wbuf._bitlength(42) == 6
		assert self.wbuf._bitlength(Py26Int(42)) == 6

	def test_mpint1(self):
		mpint1w = lambda x: self.wbuf().write_mpint1(x).write_flush()  # noqa
		mpint1r = lambda x: self.rbuf(x).read_mpint1()  # noqa
		tc = [(0x0,     '00 00'),
		      (0x1234,  '00 0d 12 34'),
		      (0x12345, '00 11 01 23 45'),
		      (0xdeadbeef, '00 20 de ad be ef')]
		for p in tc:
			assert mpint1w(p[0]) == self._b(p[1])
			assert mpint1r(self._b(p[1])) == p[0]

	def test_mpint2(self):
		mpint2w = lambda x: self.wbuf().write_mpint2(x).write_flush()  # noqa
		mpint2r = lambda x: self.rbuf(x).read_mpint2()  # noqa
		tc = [(0x0,               '00 00 00 00'),
		      (0x80,              '00 00 00 02 00 80'),
		      (0x9a378f9b2e332a7, '00 00 00 08 09 a3 78 f9 b2 e3 32 a7'),
		      (-0x1234,           '00 00 00 02 ed cc'),
		      (-0xdeadbeef,       '00 00 00 05 ff 21 52 41 11'),
		      (-0x8000,           '00 00 00 02 80 00'),
		      (-0x80,             '00 00 00 01 80')]
		for p in tc:
			assert mpint2w(p[0]) == self._b(p[1])
			assert mpint2r(self._b(p[1])) == p[0]
		assert mpint2r(self._b('00 00 00 02 ff 80')) == -0x80