forked from scriptkitty/EthereumTest
/
discovery.py
167 lines (139 loc) · 7.04 KB
/
discovery.py
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#!/usr/bin/env python
import socket
import threading
import time
import struct
import rlp
from crypto import keccak256
from secp256k1 import PrivateKey, PublicKey
from ipaddress import ip_address
from gevent.server import DatagramServer
from packets import EndPoint, PingPacket, PongPacket, FindNodePacket, NeighborsPacket, Node
# Structure:
# Hash || Signature || packet_type || packet_data
# 32 Byte || 64 Byte + 1 Byte (for recoverable)|| 1 Byte || rest, rlp-encoded
# ptype ping = x01
# ptype pong = x02
# from geth source code:
# Endpoint of pong packet should reflect UDP envelope address of the ping packet
class PingServer(object):
def __init__(self, my_endpoint, remote_endpoint, pingSleep, privKeyFile, kid):
self.myEndpoint = my_endpoint
self.theirEndpoint = remote_endpoint
self.pingSleep = pingSleep
self.kid = kid
## get private key
pkf = open(privKeyFile, "r")
priv_key_serialized = pkf.read()
pkf.close()
self.priv_key = PrivateKey()
self.priv_key.deserialize(priv_key_serialized)
## init socket
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind((self.myEndpoint.address.exploded, self.myEndpoint.udpPort))
def startPingLoop(self):
self.pingLoopThread = threading.Thread(target=self._pingLoop).start()
def startListening(self):
print("Server " + str(self.kid) + ", start listening")
self.listenThread = threading.Thread(target=self._listenLoop).start()
def _pingLoop(self):
print("pingLoop")
while True:
self.ping(self.theirEndpoint)
self.findnode(self.theirEndpoint, 0x6f8a80d14311c39f35f516fa664deaaaa13e85b2f7493f37f6144d86991ec012937307647bd3b9a82abe2974e1407241d54947bbb39763a4cac9f77166ad92a0)
# self.neighbors(self.theirEndpoint, 0x6f8a80d14311c39f35f516fa664deaaaa13e85b2f7493f37f6144d86991ec012937307647bd3b9a82abe2974e1407241d54947bbb39763a4cac9f77166ad92a0)
time.sleep(self.pingSleep)
def wrap_packet(self, packet):
payload = packet.packet_type + rlp.encode(packet.pack())
sig = self.priv_key.ecdsa_sign_recoverable(keccak256(payload), raw = True)
sig_serialized = self.priv_key.ecdsa_recoverable_serialize(sig)
# print(str(type(sig_serialized[0])) + " " + str(type(sig_serialized[1])) + str(type(payload)))
# print(sig_serialized[1])
payload = sig_serialized[0] + bytes([sig_serialized[1]]) + payload
payload_hash = keccak256(payload)
return payload_hash + payload
def _listenLoop(self):
print("Start Listening...")
while True:
data, addr = self.sock.recvfrom(2048)
print("--------------- New Packet (ID: " + str(self.kid) + ") -------------")
self.handlePacket(data, addr)
def handlePacket(self, data, addr):
# print("received message[" + str(addr) + "]")
msg_hash = data[:32] # 32 Byte Hash
raw_sig = data[32:97] # 64 Byte + 1 Byte Signature
ptype = data[97] # 1 Byte packet_type
pdata = data[98:] # Rest is rlp-encoded data
decdata = rlp.decode(pdata)
signedData = data[97:]
# Verify hash
if msg_hash != keccak256(data[32:]):
print("Invalid message hash!")
exit(0)
# Verify signature
deserialized_sig = self.priv_key.ecdsa_recoverable_deserialize(raw_sig[:64],
raw_sig[64])
remote_pubkey = self.priv_key.ecdsa_recover(keccak256(signedData),
deserialized_sig,
raw = True)
pub = PublicKey()
pub.public_key = remote_pubkey
verified = pub.ecdsa_verify(keccak256(signedData),
pub.ecdsa_recoverable_convert(deserialized_sig),
raw = True)
if not verified:
print("Signature invalid!")
exit(0)
else:
print("Public Key: " + pub.serialize().hex())
packet_type = bytes([ptype])
if packet_type == PingPacket.packet_type:
print("Got ping.")
recv_ping = PingPacket.unpack(rlp.decode(pdata))
print(str(recv_ping))
# self.pong(msg_hash, recv_ping.To())
# TODO: Find out the correct endpoint
self.pong(self.theirEndpoint, msg_hash)
if packet_type == PongPacket.packet_type:
print("Got pong.")
recv_pong = PongPacket.unpack(decdata)
print(str(recv_pong))
# self.ping(self.theirEndpoint)
if packet_type == FindNodePacket.packet_type:
print("Got FindNodePacket.")
recv_findnode = FindNodePacket.unpack(rlp.decode(pdata))
target = recv_findnode.target
print("Target: " + str(target.hex()))
self.neighbors(self.theirEndpoint, target)
if packet_type == NeighborsPacket.packet_type:
print("Got NeighborsPacket.")
recv_neighbors = NeighborsPacket.unpack(rlp.decode(pdata))
print("# Neighbors: " + str(len(recv_neighbors.neighbors)))
def ping(self, theirEndpoint):
ping = PingPacket(self.myEndpoint, theirEndpoint, time.time() + 60)
message = self.wrap_packet(ping)
print("Sending ping to: " + str(theirEndpoint))
self.sock.sendto(message, (theirEndpoint.address.exploded, theirEndpoint.udpPort))
def pong(self, theirEndpoint, echo):
pong = PongPacket(theirEndpoint, echo, time.time() + 60)
message = self.wrap_packet(pong)
print("Sending pong to: " + str(theirEndpoint))
self.sock.sendto(message, (theirEndpoint.address.exploded, theirEndpoint.udpPort))
def findnode(self, theirEndpoint, target):
findnode = FindNodePacket(target, time.time() + 60)
message = self.wrap_packet(findnode)
print("Sending FindNodePacket to: " + str(theirEndpoint))
self.sock.sendto(message, (theirEndpoint.address.exploded, theirEndpoint.udpPort))
def neighbors(self, theirEndpoint, target):
# Compute some close neighbors on the fly
neighbors = self.computeClosestNeighbors(target)
packet = NeighborsPacket(neighbors, time.time() + 60)
message = self.wrap_packet(packet)
print("Sending NeighborsPacket to: " + str(theirEndpoint))
self.sock.sendto(message, (theirEndpoint.address.exploded, theirEndpoint.udpPort))
def computeClosestNeighbors(self, target):
# Just return some hard coded IDs for now
return [
Node(self.myEndpoint.address, self.myEndpoint.udpPort, self.myEndpoint.tcpPort, 0x6f8a80d14311c39f35f516fa664deaaaa13e85b2f7493f37f6144d86991ec012937307647bd3b9a82abe2974e1407241d54947bbb39763a4cac9f77166ad92a0),
Node(self.myEndpoint.address, self.myEndpoint.udpPort, self.myEndpoint.tcpPort, 0x7f8a80d14311c39f35f516fa664deaaaa13e85b2f7493f37f6144d86991ec012937307647bd3b9a82abe2974e1407241d54947bbb39763a4cac9f77166ad92a0),
]