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chord_packet.py
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chord_packet.py
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# Copyright (c) 2014-2015 Sam Maloney.
# License: GPL v2.
import llog
from enum import Enum
import logging
import struct
from chordexception import ChordException
from db import Peer
import peer as mnpeer
import sshtype
# Chord Message Types.
CHORD_MSG_RELAY = 100
CHORD_MSG_NODE_INFO = 110
CHORD_MSG_GET_PEERS = 115
CHORD_MSG_PEER_LIST = 120
CHORD_MSG_FIND_NODE = 150
CHORD_MSG_GET_DATA = 160
CHORD_MSG_DATA_RESPONSE = 162
CHORD_MSG_DATA_PRESENCE = 165
CHORD_MSG_STORE_DATA = 170
CHORD_MSG_STORE_KEY = 171
CHORD_MSG_DATA_STORED = 172
CHORD_MSG_STORAGE_INTEREST = 175
class DataMode(Enum):
none = 0
get = 10
store = 20
log = logging.getLogger(__name__)
class ChordMessage(object):
@staticmethod
def parse_type(buf):
return struct.unpack("B", buf[0:1])[0]
def __init__(self, packet_type=None, buf=None):
self.buf = buf
self.packet_type = packet_type
if not buf:
return
self._packet_type = packet_type # Expected packet_type.
self.parse()
def parse(self):
self.packet_type = struct.unpack("B", self.buf[0:1])[0]
if self._packet_type and self.packet_type != self._packet_type:
raise ChordException("Expecting packet type [{}] but got [{}]."\
.format(self._packet_type, self.packet_type))
def encode(self):
nbuf = bytearray()
nbuf += struct.pack("B", self.packet_type & 0xff)
self.buf = nbuf
return nbuf
class ChordRelay(ChordMessage):
def __init__(self, buf = None):
self.index = None
self.packets = None
super().__init__(CHORD_MSG_RELAY, buf)
@property
def for_data(self):
raise Exception("No more such property.")
def encode(self):
nbuf = super().encode()
nbuf += struct.pack(">L", self.index)
nbuf += struct.pack(">L", len(self.packets))
for packet in self.packets:
nbuf += sshtype.encodeBinary(packet)
return nbuf
def parse(self):
super().parse()
i = 1
self.index = struct.unpack(">L", self.buf[i:i+4])[0]
i += 4
cnt = struct.unpack(">L", self.buf[i:i+4])[0]
i += 4
self.packets = []
for n in range(cnt):
l, packet = sshtype.parseBinary(self.buf[i:])
i += l
self.packets.append(packet)
class ChordNodeInfo(ChordMessage):
def __init__(self, buf = None):
self.sender_address = ""
self.version = None
super().__init__(CHORD_MSG_NODE_INFO, buf)
def encode(self):
nbuf = super().encode()
nbuf += sshtype.encodeString(self.sender_address)
nbuf += sshtype.encodeString(self.version)
return nbuf
def parse(self):
super().parse()
i = 1
i, self.sender_address = sshtype.parse_string_from(self.buf, i)
if i == len(self.buf):
return
if len(self.buf) - i > 64:
raise ChordException("Version string in packet is too long.")
i, self.version = sshtype.parse_string_from(self.buf, i)
class ChordGetPeers(ChordMessage):
def __init__(self, buf = None):
self.sender_port = None
super().__init__(CHORD_MSG_GET_PEERS, buf)
def encode(self):
nbuf = super().encode()
nbuf += struct.pack(">L", self.sender_port)
return nbuf
def parse(self):
super().parse()
i = 1
self.sender_port = struct.unpack(">L", self.buf[i:i+4])[0]
class ChordPeerList(ChordMessage):
def __init__(self, buf=None, peers=None):
self.peers = peers # [peer.Peer or db.Peer]
super().__init__(CHORD_MSG_PEER_LIST, buf)
def encode(self):
nbuf = super().encode()
nbuf += struct.pack(">L", len(self.peers))
for peer in self.peers:
nbuf += sshtype.encodeString(peer.address)
nbuf += sshtype.encodeBinary(peer.node_id)
if type(peer) is mnpeer.Peer:
nbuf += sshtype.encodeBinary(peer.node_key.asbytes())
else:
assert type(peer) is Peer
nbuf += sshtype.encodeBinary(peer.pubkey)
return nbuf
def parse(self):
super().parse()
i = 1
pcnt = struct.unpack(">L", self.buf[i:i+4])[0]
i += 4
self.peers = []
for n in range(pcnt):
if log.isEnabledFor(logging.DEBUG):
log.debug("Reading record {}.".format(n))
peer = Peer() # db.Peer.
l, peer.address = sshtype.parseString(self.buf[i:])
i += l
l, peer.node_id = sshtype.parseBinary(self.buf[i:])
i += l
l, peer.pubkey = sshtype.parseBinary(self.buf[i:])
i += l
self.peers.append(peer)
class ChordFindNode(ChordMessage):
def __init__(self, buf = None):
self.node_id = None
self.data_mode = DataMode.none
self.version = None
self.significant_bits = None
self.target_key = None
super().__init__(CHORD_MSG_FIND_NODE, buf)
def encode(self):
nbuf = super().encode()
nbuf += sshtype.encodeBinary(self.node_id)
nbuf += struct.pack("B", self.data_mode.value)
nbuf += struct.pack("?", self.version is not None)
if self.version is not None:
nbuf += sshtype.encodeMpint(self.version)
if self.significant_bits:
nbuf += struct.pack(">H", self.significant_bits)
if self.target_key:
nbuf += sshtype.encodeBinary(self.target_key)
return nbuf
def parse(self):
super().parse()
i = 1
l, self.node_id = sshtype.parseBinary(self.buf[i:])
i += l
self.data_mode = DataMode(struct.unpack("B", self.buf[i:i+1])[0])
i += 1
has_version = struct.unpack_from("?", self.buf, i)[0]
i += 1
if has_version:
i, self.version = sshtype.parse_mpint_from(self.buf, i)
if i == len(self.buf):
return
self.significant_bits = struct.unpack(">H", self.buf[i:i+2])[0]
i += 2
if i == len(self.buf):
return
i, self.target_key = sshtype.parse_binary_from(self.buf, i)
class ChordGetData(ChordMessage):
def __init__(self, buf = None):
super().__init__(CHORD_MSG_GET_DATA, buf)
def encode(self):
nbuf = super().encode()
return nbuf
def parse(self):
super().parse()
class ChordDataResponse(ChordMessage):
def __init__(self, buf = None):
self.data = None
self.original_size = 0 # Original (unencrypted) length.
self.version = None
self.signature = None
self.epubkey = None
self.pubkeylen = None
super().__init__(CHORD_MSG_DATA_RESPONSE, buf)
def encode(self):
nbuf = super().encode()
nbuf += sshtype.encodeBinary(self.data)
nbuf += struct.pack(">L", self.original_size)
if self.version is not None:
nbuf += sshtype.encodeMpint(self.version)
nbuf += sshtype.encodeBinary(self.signature)
if self.epubkey:
nbuf += sshtype.encodeBinary(self.epubkey)
nbuf += struct.pack(">L", self.pubkeylen)
return nbuf
def parse(self):
super().parse()
i = 1
l, self.data = sshtype.parseBinary(self.buf[i:])
i += l
self.original_size = struct.unpack(">L", self.buf[i:i+4])[0]
i += 4
if i == len(self.buf):
return
l, self.version = sshtype.parseMpint(self.buf[i:])
i += l
l, self.signature = sshtype.parseBinary(self.buf[i:])
i += l
if i == len(self.buf):
return
l, self.epubkey = sshtype.parseBinary(self.buf[i:])
i += l
self.pubkeylen = struct.unpack(">L", self.buf[i:i+4])[0]
class ChordDataPresence(ChordMessage):
def __init__(self, buf = None):
self.data_present = False
self.first_id = None
super().__init__(CHORD_MSG_DATA_PRESENCE, buf)
def encode(self):
nbuf = super().encode()
if self.first_id is None:
nbuf += struct.pack("?", self.data_present)
else:
nbuf += sshtype.encodeBinary(self.first_id)
return nbuf
def parse(self):
super().parse()
i = 1
if i + 1 == len(self.buf):
self.data_present = struct.unpack("?", self.buf[i:i+1])[0]
else:
l, self.first_id = sshtype.parseBinary(self.buf[i:])
class ChordStoreData(ChordMessage):
def __init__(self, buf = None):
self.data = None
self.targeted = False
self.pubkey = None
self.path_hash = None
self.version = None
self.signature = None
super().__init__(CHORD_MSG_STORE_DATA, buf)
@property
def data_id(self):
raise Exception("No more such property.")
def encode(self):
nbuf = super().encode()
nbuf += sshtype.encodeBinary(self.data)
nbuf += struct.pack("?", self.targeted)
if self.pubkey:
# Updateable keys.
nbuf += sshtype.encodeBinary(self.pubkey)
nbuf += sshtype.encodeBinary(self.path_hash)
nbuf += sshtype.encodeMpint(self.version)
nbuf += sshtype.encodeBinary(self.signature)
return nbuf
def parse(self):
super().parse()
i = 1
l, self.data = sshtype.parseBinary(self.buf[i:])
i += l
self.targeted = struct.unpack_from("?", self.buf, i)[0]
i += 1
if i == len(self.buf):
return
l, self.pubkey = sshtype.parseBinary(self.buf[i:])
i += l
l, self.path_hash = sshtype.parseBinary(self.buf[i:])
i += l
l, self.version = sshtype.parseMpint(self.buf[i:])
i += l
l, self.signature = sshtype.parseBinary(self.buf[i:])
class ChordStoreKey(ChordMessage):
def __init__(self, buf = None):
self.data = None
self.targeted = False
super().__init__(CHORD_MSG_STORE_KEY, buf)
def encode(self):
nbuf = super().encode()
nbuf += sshtype.encodeBinary(self.data)
nbuf += struct.pack("?", self.targeted)
return nbuf
def parse(self):
super().parse()
i = 1
l, self.data = sshtype.parseBinary(self.buf[i:])
i += l
self.targeted = struct.unpack_from("?", self.buf, i)[0]
class ChordDataStored(ChordMessage):
def __init__(self, buf = None):
self.stored = False
super().__init__(CHORD_MSG_DATA_STORED, buf)
def encode(self):
nbuf = super().encode()
nbuf += struct.pack("?", self.stored)
return nbuf
def parse(self):
super().parse()
i = 1
self.stored = struct.unpack("?", self.buf[i:i+1])[0]
class ChordStorageInterest(ChordMessage):
def __init__(self, buf = None):
self.will_store = False
super().__init__(CHORD_MSG_STORAGE_INTEREST, buf)
def encode(self):
nbuf = super().encode()
nbuf += struct.pack("?", self.will_store)
return nbuf
def parse(self):
super().parse()
i = 1
self.will_store = struct.unpack("?", self.buf[i:i+1])[0]