79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
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import socketserver
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import pickle
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import simplecrypto
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from uuid import uuid4
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BUFSIZE = 8192
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BLOCKSIZE = 4096
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PACKET_TYPE_RECV_RESULT = 'recv_result'
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PACKET_TYPE_DATA_FRAGMENT = 'data_fragment'
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PACKET_TYPE_SVC_MESSAGE = 'svc_message'
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PACKET_TYPE_NEW_CONNECTION = 'new_connection'
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DATA_TYPE_FILE_CHUNK = 'file_chunk'
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DATA_TYPE_CMD = 'cmd'
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DATA_TYPE_SEARCH_QUERY = 'search_query'
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DATA_TYPE_SEARCH_RESULT = 'search_result'
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DATA_TYPE_PEER_PUBKEY = 'peer_pubkey'
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SVC_MESSAGE_BAD_PACKET = 'bad_packet'
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SVC_MESSAGE_DECRYPT_ERROR = 'decrypt_error'
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SVC_MESSAGE_YOU_ARE_STRANGER = 'you_are_stranger'
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RECV_OK_CODE = 0
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RECV_ERROR_CODE = 1
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HEADER_SVC_YOU_ARE_STRANGER = {'type': PACKET_TYPE_SVC_MESSAGE, 'msg': SVC_MESSAGE_YOU_ARE_STRANGER}
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HEADER_RECV_OK = {'type': PACKET_TYPE_RECV_RESULT, 'code': RECV_OK_CODE}
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HEADER_RECV_ERROR = {'type': PACKET_TYPE_RECV_RESULT, 'code': RECV_ERROR_CODE}
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key = None
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peers = {}
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class Peer:
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def __init__(self, peer_addr, pubkey):
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self.addr = peer_addr
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self.pubkey = pubkey
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def get_key():
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global key
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if not key:
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key = simplecrypto.RsaKeypair()
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return key
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def pickle_data(data):
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return pickle.dumps(data, protocol=4)
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def write_svc_msg(fobj, svc_msg, extra_data={}):
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MSG = {'type': PACKET_TYPE_SVC_MESSAGE, 'msg': svc_msg}
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if extra_data:
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MSG.update(extra_data)
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fobj.write(pickle_data(MSG))
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class UDPRequestHandler(socketserver.DatagramRequestHandler):
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def handle(self):
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datagram = self.rfile.read(BUFSIZE)
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if self.client_address not in peers:
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write_svc_msg(self.wfile, SVC_MESSAGE_YOU_ARE_STRANGER)
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return
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try:
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unpickled_datagram = pickle.dumps(datagram)
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except pickle.UnpicklingError:
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write_svc_msg(self.wfile, SVC_MESSAGE_BAD_PACKET)
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return
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pk = get_key()
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try:
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data = pickle.loads(pk.decrypt_raw(unpickled_datagram['packet']))
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except:
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write_svc_msg(self.wfile, SVC_MESSAGE_DECRYPT_ERROR, {'packet_id': unpickled_datagram['packet_id']})
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return
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block_id = data['block_id']
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fragment_num = data['num']
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cmd = data['']
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