~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2009, 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""

FTP test server.

Based on pyftpdlib: http://code.google.com/p/pyftpdlib/

"""

import errno

import os

from pyftpdlib import ftpserver

import select

import threading

from bzrlib import (

    osutils,

    tests,

    trace,

    )

from bzrlib.tests import test_server

class AnonymousWithWriteAccessAuthorizer(ftpserver.DummyAuthorizer):

    def _check_permissions(self, username, perm):

        # Like base implementation but don't warn about write permissions

        # assigned to anonymous, since that's exactly our purpose.

        for p in perm:

            if p not in self.read_perms + self.write_perms:

                raise ftpserver.AuthorizerError('No such permission "%s"' %p)

class BzrConformingFS(ftpserver.AbstractedFS):

    def chmod(self, path, mode):

        return os.chmod(path, mode)

    def listdir(self, path):

        """List the content of a directory."""

        return [osutils.safe_utf8(s) for s in os.listdir(path)]

    def fs2ftp(self, fspath):

        p = ftpserver.AbstractedFS.fs2ftp(self, osutils.safe_unicode(fspath))

        return osutils.safe_utf8(p)

    def ftp2fs(self, ftppath):

        p = osutils.safe_unicode(ftppath)

        return ftpserver.AbstractedFS.ftp2fs(self, p)

class BzrConformingFTPHandler(ftpserver.FTPHandler):

    abstracted_fs = BzrConformingFS

    def __init__(self, conn, server):

        ftpserver.FTPHandler.__init__(self, conn, server)

        self.authorizer = server.authorizer

    def ftp_SIZE(self, path):

        # bzr is overly picky here, but we want to make the test suite pass

        # first. This may need to be revisited -- vila 20090226

        line = self.fs.fs2ftp(path)

        if self.fs.isdir(self.fs.realpath(path)):

            why = "%s is a directory" % line

            self.log('FAIL SIZE "%s". %s.' % (line, why))

            self.respond("550 %s."  %why)

        else:

            ftpserver.FTPHandler.ftp_SIZE(self, path)

    def ftp_NLST(self, path):

        # bzr is overly picky here, but we want to make the test suite pass

        # first. This may need to be revisited -- vila 20090226

        line = self.fs.fs2ftp(path)

        if self.fs.isfile(self.fs.realpath(path)):

            why = "Not a directory: %s" % line

            self.log('FAIL NLST "%s". %s.' % (line, why))

            self.respond("550 %s."  %why)

        else:

            ftpserver.FTPHandler.ftp_NLST(self, path)

    def ftp_SITE_CHMOD(self, line):

        try:

            mode, path = line.split(None, 1)

            mode = int(mode, 8)

        except ValueError:

            # We catch both malformed line and malformed mode with the same

            # ValueError.

            self.respond("500 'SITE CHMOD %s': command not understood."

                         % line)

            self.log('FAIL SITE CHMOD ' % line)

            return

        ftp_path = self.fs.fs2ftp(path)

        try:

            self.run_as_current_user(self.fs.chmod, self.fs.ftp2fs(path), mode)

        except OSError, err:

            why = ftpserver._strerror(err)

            self.log('FAIL SITE CHMOD 0%03o "%s". %s.' % (mode, ftp_path, why))

            self.respond('550 %s.' % why)

        else:

            self.log('OK SITE CHMOD 0%03o "%s".' % (mode, ftp_path))

            self.respond('200 SITE CHMOD succesful.')

# pyftpdlib says to define SITE commands by declaring ftp_SITE_<CMD> methods,

# but fails to recognize them.

ftpserver.proto_cmds['SITE CHMOD'] = ftpserver._CommandProperty(

    perm='w', # Best fit choice even if not exactly right (can be d, f or m too)

    auth_needed=True, arg_needed=True, check_path=False,

    help='Syntax: SITE CHMOD <SP>  octal_mode_bits file-name (chmod file)',

    )

# An empty password is valid, hence the arg is neither mandatory not forbidden

ftpserver.proto_cmds['PASS'].arg_needed = None

class ftp_server(ftpserver.FTPServer):

    def __init__(self, address, handler, authorizer):

        ftpserver.FTPServer.__init__(self, address, handler)

        self.authorizer = authorizer

        # Worth backporting upstream ?

        self.addr = self.socket.getsockname()

class FTPTestServer(test_server.TestServer):

    """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 = []

        self._ftpd_running = False

    def get_url(self):

        """Calculate an ftp url to this server."""

        return 'ftp://anonymous@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 ftp_server to log connections, etc."""

        self.logs.append(message)

    def start_server(self, vfs_server=None):

        if not (vfs_server is None or isinstance(vfs_server,

                                                 test_server.LocalURLServer)):

            raise AssertionError(

                "FTPServer currently assumes local transport, got %s"

                % vfs_server)

        self._root = os.getcwdu()

        address = ('localhost', 0) # bind to a random port

        authorizer = AnonymousWithWriteAccessAuthorizer()

        authorizer.add_anonymous(self._root, perm='elradfmw')

        self._ftp_server = ftp_server(address, BzrConformingFTPHandler,

                                      authorizer)

        # This is hacky as hell, will not work if we need two servers working

        # at the same time, but that's the best we can do so far...

        # FIXME: At least log and logline could be overriden in the handler ?

        # -- vila 20090227

        ftpserver.log = self.log

        ftpserver.logline = self.log

        ftpserver.logerror = self.log

        self._port = self._ftp_server.socket.getsockname()[1]

        self._ftpd_starting = threading.Lock()

        self._ftpd_starting.acquire() # So it can be released by the server

        self._ftpd_thread = threading.Thread(target=self._run_server,)

        self._ftpd_thread.start()

        if 'threads' in tests.selftest_debug_flags:

            sys.stderr.write('Thread started: %s\n'

                             % (self._ftpd_thread.ident,))

        # Wait for the server thread to start (i.e release the lock)

        self._ftpd_starting.acquire()

        self._ftpd_starting.release()

    def stop_server(self):

        """See bzrlib.transport.Server.stop_server."""

        # Tell the server to stop, but also close the server socket for tests

        # that start the server but never initiate a connection. Closing the

        # socket should be done first though, to avoid further connections.

        self._ftp_server.close()

        self._ftpd_running = False

        self._ftpd_thread.join()

        if 'threads' in tests.selftest_debug_flags:

            sys.stderr.write('Thread  joined: %s\n'

                             % (self._ftpd_thread.ident,))

    def _run_server(self):

        """Run the server until stop_server is called, shut it down properly then.

        """

        self._ftpd_running = True

        self._ftpd_starting.release()

        while self._ftpd_running:

            try:

                self._ftp_server.serve_forever(timeout=0.1, count=1)

            except select.error, e:

                if e.args[0] != errno.EBADF:

                    raise

        self._ftp_server.close_all(ignore_all=True)

    def add_user(self, user, password):

        """Add a user with write access."""

        self._ftp_server.authorizer.add_user(user, password, self._root,

                                             perm='elradfmw')