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# Copyright (C) 2007 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
FTP test server.
Based on medusa: http://www.amk.ca/python/code/medusa.html
"""
import asyncore
import errno
import os
import select
import stat
import threading
import medusa
import medusa.filesys
import medusa.ftp_server
from bzrlib import (
tests,
trace,
transport,
)
class test_filesystem(medusa.filesys.os_filesystem):
"""A custom filesystem wrapper to add missing functionalities."""
def chmod(self, path, mode):
p = self.normalize (self.path_module.join (self.wd, path))
return os.chmod(self.translate(p), mode)
class test_authorizer(object):
"""A custom Authorizer object for running the test suite.
The reason we cannot use dummy_authorizer, is because it sets the
channel to readonly, which we don't always want to do.
"""
def __init__(self, root):
self.root = root
# If secured_user is set secured_password will be checked
self.secured_user = None
self.secured_password = None
def authorize(self, channel, username, password):
"""Return (success, reply_string, filesystem)"""
channel.persona = -1, -1
if username == 'anonymous':
channel.read_only = 1
else:
channel.read_only = 0
# Check secured_user if set
if (self.secured_user is not None
and username == self.secured_user
and password != self.secured_password):
return 0, 'Password invalid.', None
else:
return 1, 'OK.', test_filesystem(self.root)
class ftp_channel(medusa.ftp_server.ftp_channel):
"""Customized ftp channel"""
def log(self, message):
"""Redirect logging requests."""
trace.mutter('ftp_channel: %s', message)
def log_info(self, message, type='info'):
"""Redirect logging requests."""
trace.mutter('ftp_channel %s: %s', type, message)
def cmd_rnfr(self, line):
"""Prepare for renaming a file."""
self._renaming = line[1]
self.respond('350 Ready for RNTO')
# TODO: jam 20060516 in testing, the ftp server seems to
# check that the file already exists, or it sends
# 550 RNFR command failed
def cmd_rnto(self, line):
"""Rename a file based on the target given.
rnto must be called after calling rnfr.
"""
if not self._renaming:
self.respond('503 RNFR required first.')
pfrom = self.filesystem.translate(self._renaming)
self._renaming = None
pto = self.filesystem.translate(line[1])
if os.path.exists(pto):
self.respond('550 RNTO failed: file exists')
return
try:
os.rename(pfrom, pto)
except (IOError, OSError), e:
# TODO: jam 20060516 return custom responses based on
# why the command failed
# (bialix 20070418) str(e) on Python 2.5 @ Windows
# sometimes don't provide expected error message;
# so we obtain such message via os.strerror()
self.respond('550 RNTO failed: %s' % os.strerror(e.errno))
except:
self.respond('550 RNTO failed')
# For a test server, we will go ahead and just die
raise
else:
self.respond('250 Rename successful.')
def cmd_size(self, line):
"""Return the size of a file
This is overloaded to help the test suite determine if the
target is a directory.
"""
filename = line[1]
if not self.filesystem.isfile(filename):
if self.filesystem.isdir(filename):
self.respond('550 "%s" is a directory' % (filename,))
else:
self.respond('550 "%s" is not a file' % (filename,))
else:
self.respond('213 %d'
% (self.filesystem.stat(filename)[stat.ST_SIZE]),)
def cmd_mkd(self, line):
"""Create a directory.
Overloaded because default implementation does not distinguish
*why* it cannot make a directory.
"""
if len (line) != 2:
self.command_not_understood(''.join(line))
else:
path = line[1]
try:
self.filesystem.mkdir (path)
self.respond ('257 MKD command successful.')
except (IOError, OSError), e:
# (bialix 20070418) str(e) on Python 2.5 @ Windows
# sometimes don't provide expected error message;
# so we obtain such message via os.strerror()
self.respond ('550 error creating directory: %s' %
os.strerror(e.errno))
except:
self.respond ('550 error creating directory.')
def cmd_site(self, line):
command, args = line[1].split(' ', 1)
if command.lower() == 'chmod':
try:
mode, path = args.split()
mode = int(mode, 8)
except ValueError:
self.command_not_understood(' '.join(line))
return
try:
# Yes path and mode are reversed
self.filesystem.chmod(path, mode)
self.respond('200 SITE CHMOD command successful')
except AttributeError:
# The chmod method is not available in read-only
self.command_not_authorized(' '.join(line))
else:
self.command_not_understood(' '.join(line))
class ftp_server(medusa.ftp_server.ftp_server):
"""Customize the behavior of the Medusa ftp_server.
There are a few warts on the ftp_server, based on how it expects
to be used.
"""
_renaming = None
ftp_channel_class = ftp_channel
def __init__(self, *args, **kwargs):
trace.mutter('Initializing ftp_server: %r, %r', args, kwargs)
medusa.ftp_server.ftp_server.__init__(self, *args, **kwargs)
def log(self, message):
"""Redirect logging requests."""
trace.mutter('ftp_server: %s', message)
def log_info(self, message, type='info'):
"""Override the asyncore.log_info so we don't stipple the screen."""
trace.mutter('ftp_server %s: %s', type, message)
class FTPServer(transport.Server):
"""Common code for FTP server facilities."""
def __init__(self):
self._root = None
self._ftp_server = None
self._port = None
self._async_thread = None
# ftp server logs
self.logs = []
def get_url(self):
"""Calculate an ftp url to this server."""
return 'ftp://foo:bar@localhost:%d/' % (self._port)
def get_bogus_url(self):
"""Return a URL which cannot be connected to."""
return 'ftp://127.0.0.1:1'
def log(self, message):
"""This is used by medusa.ftp_server to log connections, etc."""
self.logs.append(message)
def setUp(self, vfs_server=None):
from bzrlib.transport.local import LocalURLServer
if not (vfs_server is None or isinstance(vfs_server, LocalURLServer)):
raise AssertionError(
"FTPServer currently assumes local transport, got %s" % vfs_server)
self._root = os.getcwdu()
self._ftp_server = ftp_server(
authorizer=test_authorizer(root=self._root),
ip='localhost',
port=0, # bind to a random port
resolver=None,
logger_object=self # Use FTPServer.log() for messages
)
self._port = self._ftp_server.getsockname()[1]
# Don't let it loop forever, or handle an infinite number of requests.
# In this case it will run for 1000s, or 10000 requests
self._async_thread = threading.Thread(
target=FTPServer._asyncore_loop_ignore_EBADF,
kwargs={'timeout':0.1, 'count':10000})
self._async_thread.setDaemon(True)
self._async_thread.start()
def tearDown(self):
"""See bzrlib.transport.Server.tearDown."""
self._ftp_server.close()
asyncore.close_all()
self._async_thread.join()
@staticmethod
def _asyncore_loop_ignore_EBADF(*args, **kwargs):
"""Ignore EBADF during server shutdown.
We close the socket to get the server to shutdown, but this causes
select.select() to raise EBADF.
"""
try:
asyncore.loop(*args, **kwargs)
# FIXME: If we reach that point, we should raise an exception
# explaining that the 'count' parameter in setUp is too low or
# testers may wonder why their test just sits there waiting for a
# server that is already dead. Note that if the tester waits too
# long under pdb the server will also die.
except select.error, e:
if e.args[0] != errno.EBADF:
raise
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