/
ftpserver.py
366 lines (295 loc) · 12.3 KB
/
ftpserver.py
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import socket
import enum
import os
import stat
import pwd
import grp
import threading
import sqlite3
COMMAND_PORT = 5006
class FtpMode(enum.Enum):
ACTIVE = 1
PASSIVE = 2
class TransferType(enum.Enum):
ASCII = 1
BINARY = 2
class ServerState(enum.Enum):
WAITING_FOR_LOGIN = 1
WAITING_FOR_PASSWORD = 2
LOGGED_IN = 3
class FtpRequest(threading.Thread):
def __init__(self, connection, client_id):
threading.Thread.__init__(self)
self.command_connection = connection
self.client_id = client_id
self.server_socket = None
self.data_socket = None
self.remote_host = ''
self.remote_port = 0
self.command = ''
self.parameter = ''
self.reply = ''
self.user = ''
self.current_directory = FtpServer.initDir
self.root_directory = '/'
self.server_state = ServerState.WAITING_FOR_LOGIN
self.ftp_mode = FtpMode.ACTIVE
self.transfer_type = TransferType.BINARY
def parse_input(self, input_string):
space_position = str(input_string).find(' ')
print(len(input_string))
if space_position == -1:
self.command = input_string
else:
self.command = input_string[:space_position]
if not (space_position >= len(input_string) or space_position == -1):
self.parameter = input_string[space_position + 1:]
return self.command
def run(self):
quited = False
while not quited:
line = ''
while not line.endswith('\n'):
line += (self.command_connection.recv(100)).decode('utf-8')
line = line.strip()
if line == '':
return
request_command = self.parse_input(line)
print(request_command)
if self.server_state == ServerState.WAITING_FOR_LOGIN:
self.perform_user()
elif self.server_state == ServerState.WAITING_FOR_PASSWORD:
self.perform_pass()
elif self.server_state == ServerState.LOGGED_IN:
if request_command == 'CDUP':
self.perform_cdup()
elif request_command == 'CWD':
self.perform_cwd()
elif request_command == 'QUIT':
self.perform_quit()
quited = True
elif request_command == 'RETR':
self.perform_retr()
elif request_command == 'STOR':
self.perform_stor()
elif request_command == 'LIST':
self.perform_list()
elif request_command == 'PORT':
self.perform_port()
elif request_command == 'TYPE':
self.perform_type()
elif request_command == 'NOOP':
self.perform_noop()
elif request_command == 'PASV':
self.perform_pasv()
elif request_command == 'PWD':
self.perform_pwd()
self.command_connection.send(bytes(self.reply, 'utf-8'))
self.command_connection.close()
def is_username_valid(self, username):
DB_NAME = 'users.db'
SELECT = 'SELECT name FROM users WHERE name="%s"' % username
connection = sqlite3.connect(DB_NAME)
cursor = connection.execute(SELECT)
row = cursor.fetchone()
connection.close()
return row is not None
def perform_user(self):
if self.command == 'USER':
if self.is_username_valid(self.parameter):
self.reply = '331 user name okay, need password\r\n'
self.server_state = ServerState.WAITING_FOR_PASSWORD
self.user = self.parameter
else:
self.reply = '430 incorrect username\r\n'
else:
self.reply = '501 syntax error in parameters or arguments\r\n'
def is_pass_valid(self, password):
DB_NAME = 'users.db'
SELECT = 'SELECT password FROM users WHERE name="%s"' % self.user
connection = sqlite3.connect(DB_NAME)
cursor = connection.execute(SELECT)
row = cursor.fetchone()
connection.close()
if row is None:
return False
valid_password = row[0]
if valid_password == password:
return True
else:
return False
def perform_pass(self):
if self.command == 'PASS':
if self.is_pass_valid(self.parameter):
self.reply = '230 User logged in, proceed\r\n'
self.server_state = ServerState.LOGGED_IN
else:
self.reply = '430 Invalid password\r\n'
else:
self.reply = '530 Not logged in\r\n'
def perform_cdup(self):
if self.current_directory != self.root_directory:
self.current_directory = os.path.abspath(os.path.join(self.current_directory, os.pardir))
self.reply = '200 ok\r\n'
if not self.current_directory.endswith('/'):
self.current_directory += '/'
def perform_cwd(self):
if not self.current_directory.endswith('/'):
self.current_directory += '/'
if os.path.exists(self.parameter) and os.path.isdir(self.parameter):
if self.parameter == '..' or self.parameter == '..\\':
if self.current_directory != self.root_directory:
self.current_directory = os.path.abspath(os.path.join(self.current_directory, os.pardir))
self.reply = '200 ok\r\n'
elif self.parameter == '.' or self.parameter == '.\\':
pass
else:
self.current_directory = self.parameter
elif (os.path.exists(self.current_directory + self.parameter)
and os.path.isdir(self.current_directory + self.parameter)):
self.current_directory += self.parameter
self.reply = '250 ok\r\n'
else:
self.reply = '501 syntax error in parameters or arguments\r\n'
if not self.current_directory.endswith('/'):
self.current_directory += '/'
def perform_quit(self):
self.reply = '221 service closing connection\r\n'
def perform_retr(self):
if self.parameter == '':
self.reply = '501 syntax error\r\n'
return
requested_file = self.current_directory + self.parameter
self.command_connection.send(
bytes('150 opening binary mode data connection for ' + requested_file + '\r\n', 'utf-8')
)
if self.ftp_mode == FtpMode.ACTIVE:
self.data_socket = socket.socket()
self.data_socket.connect((self.remote_host, self.remote_port))
elif self.ftp_mode == FtpMode.PASSIVE:
self.data_socket, addr = self.server_socket.accept()
if self.transfer_type == TransferType.BINARY:
content = open(requested_file, 'rb').read()
self.data_socket.send(content)
self.reply = '226 file transfer finished\r\n'
elif self.transfer_type == TransferType.ASCII:
content = open(requested_file, 'rt').read()
self.data_socket.send(bytes(content, 'utf-8'))
self.reply = '226 file transfer finished\r\n'
self.data_socket.close()
def perform_stor(self):
if self.parameter == '':
self.reply = '501 syntax error\r\n'
return
stored_file = self.current_directory + self.parameter
self.command_connection.send(
bytes('150 Opening data connection for ' + stored_file + '\r\n', 'utf-8')
)
if self.ftp_mode == FtpMode.ACTIVE:
self.data_socket = socket.socket()
self.data_socket.connect((self.remote_host, self.remote_port))
elif self.ftp_mode == FtpMode.PASSIVE:
self.data_socket, addr = self.server_socket.accept()
if self.transfer_type == TransferType.BINARY:
file = open(stored_file, 'wb+')
data = b' '
while len(data) != 0:
data = self.data_socket.recv(4096)
file.write(data)
file.close()
elif self.transfer_type == TransferType.ASCII:
file = open(stored_file, 'wt+')
data = ' '
while len(data) != 0:
data = self.data_socket.recv(4096)
data = data.decode('UTF-8')
file.write(data)
file.close()
self.reply = '226 transfer complete\r\n'
def perform_pwd(self):
self.reply = '257 "' + self.current_directory + '"\r\n'
def perform_list(self):
if self.ftp_mode == FtpMode.ACTIVE:
if self.remote_host == '' or self.remote_port == 0:
self.reply = '503 bad sequence of commands\r\n'
return
self.data_socket = socket.socket()
self.data_socket.connect((self.remote_host, self.remote_port))
elif self.ftp_mode == FtpMode.PASSIVE:
self.data_socket, addr = self.server_socket.accept()
self.command_connection.send(bytes('125 data connection already open\r\n', 'utf-8'))
if not self.current_directory.endswith('/'):
self.current_directory += '/'
try:
for i in os.listdir(self.current_directory):
permission = stat.filemode(os.stat(self.current_directory + i).st_mode)
stat_info = os.stat(self.current_directory + i)
uid = stat_info.st_uid
gid = stat_info.st_gid
user = pwd.getpwuid(uid)[0]
group = grp.getgrgid(gid)[0]
file_size = os.stat(self.current_directory + i).st_size
self.data_socket.send(bytes(permission + ' 1 ' + user + " " + group + " " + str(file_size) + " " + i + '\r\n', 'utf-8'))
except PermissionError:
pass
except FileNotFoundError:
pass
self.data_socket.close()
self.reply = '226 transfer complete\r\n'
def perform_port(self):
address_parts = []
parts_amount = 6
start_position = 0
for i in range(0, parts_amount - 1):
end_position = self.parameter.find(',', start_position)
address_parts.append(self.parameter[start_position:end_position])
start_position = end_position + 1
address_parts.append(self.parameter[start_position:])
self.remote_host = address_parts[0] + '.' + address_parts[1] + '.' \
+ address_parts[2] + '.' + address_parts[3]
self.remote_port = int(address_parts[4]) * 256 + int(address_parts[5])
print(int(address_parts[4]) * 256 + int(address_parts[5]))
self.ftp_mode = FtpMode.ACTIVE
self.reply = '200 \r\n'
def perform_type(self):
if self.parameter == 'A':
self.transfer_type = TransferType.ASCII
self.reply = '200 change to ascii mode\r\n'
elif self.parameter == 'I':
self.transfer_type = TransferType.BINARY
self.reply = '200 change to binary mode\r\n'
else:
self.reply = '504 command not implemented\r\n'
def perform_noop(self):
self.reply = '200 ok'
def perform_pasv(self):
if self.server_socket is not None:
self.server_socket.close()
self.server_socket = socket.socket()
self.server_socket.bind(('127.0.0.1', 0))
data_port = self.server_socket.getsockname()[1]
self.server_socket.listen(10)
self.reply = '227 entering passive mode(127,0,0,1,%d,%d)\r\n' % (int(data_port / 256), data_port % 256)
self.ftp_mode = FtpMode.PASSIVE
class FtpServer:
counter = 0
initDir = '/'
users = []
usersInfo = []
def __init__(self):
counter = 1
client_id = 0
command_socket = socket.socket()
command_socket.bind(('127.0.0.1', COMMAND_PORT))
command_socket.listen(10)
while True:
connection, addr = command_socket.accept()
connection.send(bytes('220 service ready for new user, ' + str(counter) + '\r\n', 'utf-8'))
ftp_request = FtpRequest(connection, client_id)
print("few")
ftp_request.start()
FtpServer.users.append(ftp_request)
counter += 1
client_id += 1
if __name__ == '__main__':
ftp_server = FtpServer()