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storage_node.py
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storage_node.py
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import os, ConfigParser, sys
import json
from urllib2 import urlopen
from twisted.internet import reactor, protocol
from twisted.protocols import basic
from common import COMMANDS, display_message, validate_file_md5_hash, get_file_md5_hash, read_bytes_from_file, clean_and_split_input, get_file_sha256_hash
import client_node
import pickle, base64
from Crypto.PublicKey import RSA
class FileTransferProtocol(basic.LineReceiver):
delimiter = '\n'
def connectionMade(self):
self.factory.clients.append(self)
self.file_handler = None
self.file_data = ()
self.transport.write('Welcome\n')
self.transport.write('Type help for list of all the available commands\n')
self.transport.write('ENDMSG\n')
display_message('Connection from: %s (%d clients total)' % (self.transport.getPeer().host, len(self.factory.clients)))
def connectionLost(self, reason):
self.factory.clients.remove(self)
self.file_handler = None
self.file_data = ()
display_message('Connection from %s lost (%d clients left)' % (self.transport.getPeer().host, len(self.factory.clients)))
def lineReceived(self, line):
#display_message('Received the following line from the client [%s]: %s' % (self.transport.getPeer().host, line))
data = self._cleanAndSplitInput(line)
if len(data) == 0 or data == '':
return
command = data[0].lower()
print command
if not command in COMMANDS:
self.transport.write('Invalid command\n')
self.transport.write('ENDMSG\n')
return
if command == 'list':
self._send_list_of_files()
elif command == 'get':
try:
filename = data[1]
except IndexError:
self.transport.write('Missing filename\n')
self.transport.write('ENDMSG\n')
return
if not self.factory.files:
self.factory.files = self._get_file_list()
if not filename in self.factory.files:
self.transport.write('File with filename %s does not exist\n' % (filename))
self.transport.write('ENDMSG\n')
return
display_message('Sending file: %s (%d KB)' % (filename, self.factory.files[filename][1] / 1024))
self.transport.write('HASH %s %s\n' % (filename, get_file_md5_hash(self.factory.files_path + '/' + filename)))
self.setRawMode()
for bytes in read_bytes_from_file(os.path.join(self.factory.files_path, filename)):
self.transport.write(bytes)
self.transport.write('\r\n')
self.setLineMode()
elif command == 'put':
try:
filename = data[1]
file_hash = data[2]
signed_hash = pickle.loads(base64.b64decode(data[3]))
except IndexError:
self.transport.write('Missing filename or file MD5 hash\n')
self.transport.write('ENDMSG\n')
return
self.file_data = (filename, file_hash, signed_hash)
# Switch to the raw mode (for receiving binary data)
print 'Receiving file: %s' % (filename)
self.setRawMode()
elif command == 'help':
self.transport.write('Available commands:\n\n')
for key, value in COMMANDS.iteritems():
self.transport.write('%s - %s\n' % (value[0], value[1]))
self.transport.write('ENDMSG\n')
elif command == 'quit':
self.transport.loseConnection()
def rawDataReceived(self, data):
filename = self.file_data[0]
file_path = os.path.join(self.factory.files_path, filename)
display_message('Receiving file chunk (%d KB)' % (len(data)))
if not self.file_handler:
self.file_handler = open(file_path, 'wb')
if data.endswith('\r\n'):
# Last chunk
data = data[:-2]
self.file_handler.write(data)
self.setLineMode()
self.file_handler.close()
self.file_handler = None
if validate_file_md5_hash(file_path, self.file_data[1]):
print 'md5 Validate Passed for file: %s' % file_path
if filename in new_files and new_files[filename][0].verify(self.file_data[1],self.file_data[2]):
self.transport.write('Successful Transfer\n')
self.transport.write('ENDMSG\n')
display_message('File %s has been successfully transfered' % (filename))
self.factory.message_siblings(new_files[filename][2], ('FILESENT', filename))
del new_files[filename]
else:
display_message('Public Key Signature not valid')
self.transport.write('Invalid Public Key Signature\n')
else:
os.unlink(file_path)
self.transport.write('File was successfully transfered but not saved, due to invalid MD5 hash\n')
self.transport.write('ENDMSG\n')
display_message('File %s has been successfully transfered, but deleted due to invalid MD5 hash' % (filename))
else:
self.file_handler.write(data)
def _send_list_of_files(self):
files = self._get_file_list()
self.factory.files = files
self.transport.write('Files (%d): \n\n' % len(files))
for key, value in files.iteritems():
self.transport.write('- %s (%d.2 KB)\n' % (key, (value[1] / 1024.0)))
self.transport.write('ENDMSG\n')
def _get_file_list(self):
""" Returns a list of the files in the specified directory as a dictionary:
dict['file name'] = (file path, file size, file md5 hash)
"""
file_list = {}
for filename in os.listdir(self.factory.files_path):
file_path = os.path.join(self.factory.files_path, filename)
if os.path.isdir(file_path):
continue
file_size = os.path.getsize(file_path)
md5_hash = get_file_md5_hash(file_path)
file_list[filename] = (file_path, file_size, md5_hash)
return file_list
def _cleanAndSplitInput(self, input):
input = input.strip()
input = input.split(' ')
return input
class FileTransferServerFactory(protocol.ServerFactory):
protocol = FileTransferProtocol
def __init__(self, files_path):
self.files_path = files_path
self.clients = []
self.files = None
def message_siblings(self, name, message):
self.root.message_children(self.name, name, message)
class StorageNodeMediatorClientProtocol(basic.LineReceiver):
delimiter = '\n'
def connectionMade(self):
self.setLineMode()
print "Connected to the Mediator Server"
self.state = 'REGISTER'
def lineReceived(self, line):
msg = self.parse_message(line)
cmd, msg = msg[0], msg[1:]
print cmd, msg
if cmd == 'NEWFILE':
self.handle_NEWFILE(msg)
elif cmd == 'MEDREG':
self.handle_MEDREG(msg)
elif cmd == 'REGISTER':
register_details = self.mediator_details()
self.transport.write(register_details + '\n')
elif cmd == 'VERIFY':
self.handle_VERIFY(msg)
elif cmd == 'REQUESTFILE':
self.handle_REQUESTFILE(msg)
elif cmd == 'PRINT':
print 'msg:', msg
def handle_REQUESTFILE(self, msg):
filename, ip, port = msg
reactor.connectTCP(ip, port, client_node.FileTransferClientFactory('get', self.factory.configpath, filename))
def handle_VERIFY(self, msg):
filename, nonce = msg
sha256hash = get_file_sha256_hash(self.factory.configpath + '/' + filename, nonce=nonce)
self.transport.write(self.encode(("VERIFY", filename, sha256hash)) + '\n')
def parse_message(self, line):
data = pickle.loads(base64.b64decode(line))
return data
def encode(self, msg):
data = base64.b64encode(pickle.dumps(msg))
return data
def handle_MEDREG(self, msg):
self.factory.mediators[msg[0]] = self
def handle_NEWFILE(self, msg):
filename, size, pubkey, medpub = msg
print filename, size, pubkey
global new_files
new_files[filename] = (pubkey, size, medpub)
self.transport.write(self.mediator_details() + '\n')
register_details = self.mediator_details()
self.transport.write(register_details + '\n')
def mediator_details(self):
detail_string = self.encode(('STORAGE', self.factory.ip, self.factory.port,freespace(self.factory.configpath)))
signature = self.factory.rsa_key.sign(detail_string, "")
public_key = self.factory.rsa_key.publickey()
return self.encode(('REGISTER', public_key, detail_string, signature))
class StorageNodeMediatorClientFactory(protocol.ClientFactory):
protocol = StorageNodeMediatorClientProtocol
def __init__(self, configpath, configport, rsa_key):
self.configpath = configpath
self.ip = publicip()
self.port = configport
self.rsa_key = rsa_key
self.mediators = {}
def get_message(self, name, message):
if message[0] == 'FILESENT':
self.mediators[''.join(name.splitlines())].transport.write(base64.b64encode(pickle.dumps((message[0], message[1], get_file_sha256_hash(self.configpath + '/' + message[1])))) + '\n')
def ensure_dir(f):
if not os.path.exists(f):
os.makedirs(f)
def freespace(folder):
ensure_dir(folder)
s = os.statvfs(folder)
actual_space = s.f_bsize * s.f_bavail
promised_space = 0
for key in new_files:
promised_space += new_files[key][1]
return actual_space - promised_space
def publicip():
return json.load(urlopen('http://httpbin.org/ip'))['origin']
def get_rsa_key(config):
try:
rsa_key_file = config.get('storage', 'rsa_file')
rsa_file = open(rsa_key_file, 'r')
rsa_key = RSA.importKey(rsa_file.read())
rsa_file.close()
except (ConfigParser.NoOptionError, IOError) as e:
rsa_key_file = configfile + '.key'
config.set('storage', 'rsa_file', rsa_key_file)
rsa_key = RSA.generate(4096)
rsa_file = open(rsa_key_file, 'w')
rsa_file.write(rsa_key.exportKey())
rsa_file.close()
return rsa_key
new_files = {}
class FactoryContainer(object):
def __init__(self):
self.servers = {}
def add_child(self, obj, name):
self.servers[name] = obj
self.servers[name].root = self
self.servers[name].name = name
def message_children(self, sender, recipient, message):
for server in self.servers:
if server != sender:
self.servers[server].get_message(recipient, message)
def message_child(self, name, message):
if name in self.servers.keys():
self.servers[server].get_message(name, message)
if __name__ == '__main__':
try:
configfile = sys.argv[1]
except IndexError:
configfile = 'storage'
config = ConfigParser.ConfigParser()
config.readfp(open(configfile + '.cfg'))
configport = int(config.get('storage', 'port'))
configpath = config.get('storage', 'path')
rsa_key = get_rsa_key(config)
config.write(open(configfile + '.cfg', 'wb'))
display_message('Listening on port %d, serving files from directory: %s' % (configport, configpath))
container = FactoryContainer()
container.add_child(FileTransferServerFactory(configpath), 'ftpserver')
container.add_child(StorageNodeMediatorClientFactory(configpath, configport, rsa_key), 'mediator')
reactor.listenTCP(configport, container.servers['ftpserver'])
reactor.connectTCP('162.243.36.143', 8001, container.servers['mediator'])
reactor.run()