def test_shell_error_bad_port(self, _, password):
sshcp = Sshcp(host=self.host,
port=6666,
user=self.user,
password=password)
with self.assertRaises(SshcpError) as ctx:
sshcp.shell("cd {}; pwd".format(self.local_dir))
self.assertTrue("Connection refused by server" in str(ctx.exception))
def test_shell_error_bad_command(self, _, password):
sshcp = Sshcp(host=self.host,
port=self.port,
user=self.user,
password=password)
with self.assertRaises(SshcpError) as ctx:
sshcp.shell("./some_bad_command.sh".format(self.local_dir))
self.assertTrue("./some_bad_command.sh" in str(ctx.exception))
def test_shell_error_bad_host(self, _, password):
sshcp = Sshcp(host="badhost",
port=self.port,
user=self.user,
password=password)
with self.assertRaises(SshcpError) as ctx:
sshcp.shell("cd {}; pwd".format(self.local_dir))
self.assertTrue("Bad hostname" in str(ctx.exception))
def test_shell_error_bad_password(self):
sshcp = Sshcp(host=self.host,
port=self.port,
user=self.user,
password="******")
with self.assertRaises(SshcpError) as ctx:
sshcp.shell("cd {}; pwd".format(self.local_dir))
self.assertEqual("Incorrect password", str(ctx.exception))
def test_shell(self, _, password):
sshcp = Sshcp(host=self.host,
port=self.port,
user=self.user,
password=password)
out = sshcp.shell("cd {}; pwd".format(self.local_dir))
out_str = out.decode().strip()
self.assertEqual(self.local_dir, out_str)
def test_shell_with_escape_characters(self, _, password):
sshcp = Sshcp(host=self.host,
port=self.port,
user=self.user,
password=password)
# single quotes
_dir = os.path.join(self.remote_dir, "a a")
out = sshcp.shell("mkdir '{}' && cd '{}' && pwd".format(_dir, _dir))
out_str = out.decode().strip()
self.assertEqual(_dir, out_str)
# double quotes
_dir = os.path.join(self.remote_dir, "a b")
out = sshcp.shell('mkdir "{}" && cd "{}" && pwd'.format(_dir, _dir))
out_str = out.decode().strip()
self.assertEqual(_dir, out_str)
# single and double quotes - error out
_dir = os.path.join(self.remote_dir, "a b")
with self.assertRaises(ValueError):
sshcp.shell('mkdir "{}" && cd \'{}\' && pwd'.format(_dir, _dir))
class DeleteRemoteProcess(AppOneShotProcess):
def __init__(self, remote_address: str, remote_username: str,
remote_password: Optional[str], remote_port: int,
remote_path: str, file_name: str):
super().__init__(name=self.__class__.__name__)
self.__remote_path = remote_path
self.__file_name = file_name
self.__ssh = Sshcp(host=remote_address,
port=remote_port,
user=remote_username,
password=remote_password)
def run_once(self):
self.__ssh.set_base_logger(self.logger)
file_path = os.path.join(self.__remote_path, self.__file_name)
self.logger.debug("Deleting remote file {}".format(self.__file_name))
try:
out = self.__ssh.shell("rm -rf '{}'".format(file_path))
self.logger.debug("Remote delete output: {}".format(out.decode()))
except SshcpError:
self.logger.exception("Exception while deleting remote file")
class RemoteScanner(IScanner):
"""
Scanner implementation to scan the remote filesystem
"""
def __init__(self, remote_address: str, remote_username: str,
remote_password: Optional[str], remote_port: int,
remote_path_to_scan: str, local_path_to_scan_script: str,
remote_path_to_scan_script: str):
self.logger = logging.getLogger("RemoteScanner")
self.__remote_path_to_scan = remote_path_to_scan
self.__local_path_to_scan_script = local_path_to_scan_script
self.__remote_path_to_scan_script = remote_path_to_scan_script
self.__ssh = Sshcp(host=remote_address,
port=remote_port,
user=remote_username,
password=remote_password)
self.__first_run = True
# Append scan script name to remote path if not there already
script_name = os.path.basename(self.__local_path_to_scan_script)
if os.path.basename(self.__remote_path_to_scan_script) != script_name:
self.__remote_path_to_scan_script = os.path.join(
self.__remote_path_to_scan_script, script_name)
@overrides(IScanner)
def set_base_logger(self, base_logger: logging.Logger):
self.logger = base_logger.getChild("RemoteScanner")
self.__ssh.set_base_logger(self.logger)
@overrides(IScanner)
def scan(self) -> List[SystemFile]:
if self.__first_run:
self._install_scanfs()
try:
out = self.__ssh.shell("'{}' '{}'".format(
self.__remote_path_to_scan_script, self.__remote_path_to_scan))
except SshcpError as e:
self.logger.warning("Caught an SshcpError: {}".format(str(e)))
recoverable = True
# Any scanner errors are fatal
if "SystemScannerError" in str(e):
recoverable = False
# First time errors are fatal
# User should be prompted to correct these
if self.__first_run:
recoverable = False
raise ScannerError(Localization.Error.REMOTE_SERVER_SCAN.format(
str(e).strip()),
recoverable=recoverable)
try:
remote_files = pickle.loads(out)
except pickle.UnpicklingError as err:
self.logger.error("Unpickling error: {}\n{}".format(str(err), out))
raise ScannerError(Localization.Error.REMOTE_SERVER_SCAN.format(
"Invalid pickled data"),
recoverable=False)
self.__first_run = False
return remote_files
def _install_scanfs(self):
# Check md5sum on remote to see if we can skip installation
with open(self.__local_path_to_scan_script, "rb") as f:
local_md5sum = hashlib.md5(f.read()).hexdigest()
self.logger.debug("Local scanfs md5sum = {}".format(local_md5sum))
try:
out = self.__ssh.shell(
"md5sum {} | awk '{{print $1}}' || echo".format(
self.__remote_path_to_scan_script))
out = out.decode()
if out == local_md5sum:
self.logger.info(
"Skipping remote scanfs installation: already installed")
return
except SshcpError as e:
self.logger.exception("Caught scp exception")
raise ScannerError(Localization.Error.REMOTE_SERVER_INSTALL.format(
str(e).strip()),
recoverable=False)
# Go ahead and install
self.logger.info("Installing local:{} to remote:{}".format(
self.__local_path_to_scan_script,
self.__remote_path_to_scan_script))
if not os.path.isfile(self.__local_path_to_scan_script):
raise ScannerError(Localization.Error.REMOTE_SERVER_SCAN.format(
"Failed to find scanfs executable at {}".format(
self.__local_path_to_scan_script)),
recoverable=False)
try:
self.__ssh.copy(local_path=self.__local_path_to_scan_script,
remote_path=self.__remote_path_to_scan_script)
except SshcpError as e:
self.logger.exception("Caught scp exception")
raise ScannerError(Localization.Error.REMOTE_SERVER_INSTALL.format(
str(e).strip()),
recoverable=False)
class RemoteScanner(IScanner):
"""
Scanner implementation to scan the remote filesystem
"""
RETRY_COUNT = 5
def __init__(self, remote_address: str, remote_username: str,
remote_password: Optional[str], remote_port: int,
remote_path_to_scan: str, local_path_to_scan_script: str,
remote_path_to_scan_script: str):
self.logger = logging.getLogger("RemoteScanner")
self.__remote_path_to_scan = remote_path_to_scan
self.__local_path_to_scan_script = local_path_to_scan_script
self.__remote_path_to_scan_script = remote_path_to_scan_script
self.__ssh = Sshcp(host=remote_address,
port=remote_port,
user=remote_username,
password=remote_password)
self.__first_run = True
@overrides(IScanner)
def set_base_logger(self, base_logger: logging.Logger):
self.logger = base_logger.getChild("RemoteScanner")
self.__ssh.set_base_logger(self.logger)
@overrides(IScanner)
def scan(self) -> List[SystemFile]:
if self.__first_run:
self._install_scanfs()
self.__first_run = False
retries = 0
out = None
while out is None:
try:
out = self.__ssh.shell("'{}' '{}'".format(
self.__remote_path_to_scan_script,
self.__remote_path_to_scan))
except SshcpError as e:
# Suppress specific errors and retry a fixed number of times
# Otherwise raise a fatal AppError
if RemoteScanner.__suppress_error(
e) and retries < RemoteScanner.RETRY_COUNT:
self.logger.warning(
"Retrying remote scan after error: {}".format(str(e)))
out = None
retries += 1
else:
self.logger.exception("Caught an SshError")
raise AppError(Localization.Error.REMOTE_SERVER_SCAN)
try:
remote_files = pickle.loads(out)
except pickle.UnpicklingError as err:
self.logger.error("Unpickling error: {}\n{}".format(str(err), out))
raise AppError(Localization.Error.REMOTE_SERVER_SCAN)
return remote_files
def _install_scanfs(self):
self.logger.info("Installing local:{} to remote:{}".format(
self.__local_path_to_scan_script,
self.__remote_path_to_scan_script))
if not os.path.isfile(self.__local_path_to_scan_script):
raise RemoteScannerError(
"Failed to find scanfs executable at {}".format(
self.__local_path_to_scan_script))
try:
self.__ssh.copy(local_path=self.__local_path_to_scan_script,
remote_path=self.__remote_path_to_scan_script)
except SshcpError:
self.logger.exception("Caught scp exception")
raise AppError(Localization.Error.REMOTE_SERVER_INSTALL)
@staticmethod
def __suppress_error(error: SshcpError) -> bool:
error_str = str(error).lower()
errors_to_suppress = [
"text file busy", "ssh_exchange_identification",
"cannot create temporary directory", "connection timed out"
]
return any(e in error_str for e in errors_to_suppress)
