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test_channel.py
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# This file is part of ssh-python.
# Copyright (C) 2018 Panos Kittenis
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation, version 2.1.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-130
import unittest
from pytest import mark
from time import sleep
from ssh.key import SSHKey, import_pubkey_file, import_privkey_file
from ssh import options
from ssh.exceptions import KeyImportError
from ssh.utils import wait_socket
from ssh.error_codes import SSH_AGAIN
from ssh.exceptions import EOF, SSHError
from .base_case import SSHTestCase
class ChannelTest(SSHTestCase):
def test_close(self):
self._auth()
chan = self.session.channel_new()
self.assertEqual(chan.open_session(), 0)
self.assertFalse(chan.closed)
chan.request_exec('echo me')
chan.read()
self.assertFalse(chan.closed)
chan.close()
self.assertTrue(chan.closed)
chan.close()
self.session.disconnect()
chan.close()
def test_channel_exec(self):
self._auth()
chan = self.session.channel_new()
self.assertEqual(chan.open_session(), 0)
self.assertTrue(chan.is_open())
self.assertFalse(chan.is_closed())
self.assertEqual(chan.request_exec(self.cmd), 0)
self.assertFalse(chan.is_eof())
self.assertFalse(chan.is_closed())
all_data = b""
size, data = chan.read()
while size > 0:
all_data += data
try:
size, data = chan.read()
except SSHError:
break
lines = [s.decode('utf-8') for s in all_data.splitlines()]
self.assertEqual(lines[0], self.resp)
sleep(1)
self.assertTrue(chan.is_eof())
self.assertEqual(chan.close(), 0)
self.assertFalse(chan.is_open())
self.assertTrue(chan.is_closed())
def test_channel_non_blocking_exec(self):
self._auth()
self.session.set_blocking(0)
chan = self.session.channel_new()
while chan == SSH_AGAIN:
wait_socket(self.session, self.sock)
chan = self.session.channel_new()
chan.set_blocking(0)
rc = chan.open_session()
while rc == SSH_AGAIN:
wait_socket(self.session, self.sock)
rc = chan.open_session()
self.assertEqual(rc, 0)
self.assertTrue(chan.is_open())
self.assertFalse(chan.is_closed())
rc = chan.request_exec(self.cmd)
while rc == SSH_AGAIN:
wait_socket(self.session, self.sock)
rc = chan.request_exec(self.cmd)
self.assertEqual(rc, 0)
self.assertFalse(chan.is_eof())
self.assertFalse(chan.is_closed())
all_data = b""
while True:
try:
if chan.poll():
wait_socket(self.session, self.sock)
size, data = chan.read_nonblocking()
if size > 0:
all_data += data
except EOF:
break
lines = [s.decode('utf-8') for s in all_data.splitlines()]
self.assertEqual(lines[0], self.resp)
self.assertRaises(EOF, chan.poll)
self.assertTrue(chan.is_eof())
rc = chan.close()
while rc == SSH_AGAIN:
wait_socket(self.session, self.sock)
rc = chan.close()
self.assertEqual(rc, 0)
self.assertFalse(chan.is_open())
self.assertTrue(chan.is_closed())
def test_exit_code(self):
self._auth()
chan = self.session.channel_new()
self.assertEqual(chan.open_session(), 0)
self.assertEqual(chan.request_exec('exit 2'), 0)
self.assertEqual(chan.send_eof(), 0)
self.assertEqual(chan.close(), 0)
status = chan.get_exit_status()
self.assertEqual(status, 2)
def test_long_running_execute(self):
self._auth()
chan = self.session.channel_new()
self.assertEqual(chan.open_session(), 0)
self.assertEqual(chan.request_exec('sleep 1; exit 3'), 0)
chan.send_eof()
self.assertEqual(chan.close(), 0)
self.assertEqual(chan.get_exit_status(), 3)
def test_read_stderr(self):
self._auth()
chan = self.session.channel_new()
self.assertEqual(chan.open_session(), 0)
expected = ['stderr output']
chan.request_exec('echo "stderr output" >&2')
size, data = chan.read(is_stderr=True)
self.assertTrue(size > 0)
lines = [s.decode('utf-8') for s in data.splitlines()]
self.assertListEqual(expected, lines)
def test_pty(self):
self._auth()
chan = self.session.channel_new()
chan.open_session()
self.assertTrue(chan.request_pty() == 0)
_out = u'stderr output'
expected = [_out]
chan.request_exec(u'echo "%s" >&2' % (_out,))
# stderr output gets redirected to stdout with a PTY
size, data = chan.read()
self.assertTrue(size > 0)
lines = [s.decode('utf-8') for s in data.splitlines()]
self.assertListEqual(expected, lines)
def test_write_stdin(self):
self._auth()
_in = u'writing to stdin'
chan = self.session.channel_new()
chan.open_session()
chan.request_exec('cat')
chan.write(_in + '\n')
self.assertEqual(chan.send_eof(), 0)
size, data = chan.read()
self.assertTrue(size > 0)
lines = [line.decode('utf-8') for line in data.splitlines()]
self.assertListEqual([_in], lines)
chan.close()
chan.read()
self.assertTrue(chan.is_eof())
def test_write_stderr(self):
self._auth()
chan = self.session.channel_new()
chan.open_session()
chan.request_exec('echo something')
_in = u'stderr'
rc, bytes_written = chan.write_stderr(_in + '\n')
self.assertEqual(rc, 7)
self.assertEqual(bytes_written, 7)
self.assertEqual(chan.close(), 0)