class Server(object):
def __init__(self, my_endpoint):
self.endpoint = my_endpoint
# 获取私钥
priv_key_file = open('priv_key', 'r')
priv_key_serialized = priv_key_file.read()
priv_key_file.close()
self.priv_key = PrivateKey()
self.priv_key.deserialize(priv_key_serialized)
# 初始化套接字
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(('0.0.0.0', self.endpoint.udpPort))
# set socket non-blocking mode
self.sock.setblocking(0)
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)
payload = sig_serialized[0] + chr(sig_serialized[1]) + payload
payload_hash = keccak256(payload)
return payload_hash + payload
def listen(self):
print "listening..."
while True:
ready = select.select([self.sock], [], [], 1.0)
if ready[0]:
data, addr = self.sock.recvfrom(2048)
print "received message[", addr, "]:"
self.receive(data)
def listen_thread(self):
thread = threading.Thread(target=self.listen)
thread.daemon = True
return thread
def receive(self, data):
# verify hash
msg_hash = data[:32]
if msg_hash != keccak256(data[32:]):
print " First 32 bytes are not keccak256 hash of the rest."
return
else:
print " Verified message hash."
# verify signature
signature = data[32:97]
signed_data = data[97:]
deserialized_sig = self.priv_key.ecdsa_recoverable_deserialize(
signature[:64], ord(signature[64]))
remote_pubkey = self.priv_key.ecdsa_recover(keccak256(signed_data),
deserialized_sig,
raw=True)
pub = PublicKey()
pub.public_key = remote_pubkey
verified = pub.ecdsa_verify(
keccak256(signed_data),
pub.ecdsa_recoverable_convert(deserialized_sig),
raw=True)
if not verified:
print " Signature invalid"
return
else:
print " Verified signature."
response_types = {
PingNode.packet_type: self.receive_ping,
Pong.packet_type: self.receive_pong,
FindNeighbors.packet_type: self.receive_find_neighbors,
Neighbors.packet_type: self.receive_neighbors
}
try:
packet_type = data[97]
dispatch = response_types[packet_type]
except KeyError:
print " Unknown message type: " + data[97]
return
payload = data[98:]
dispatch(payload, msg_hash)
def receive_pong(self, payload, msg_hash):
print " received Pong"
print "", Pong.unpack(rlp.decode(payload))
def receive_ping(self, payload, msg_hash):
print " received Ping"
ping = PingNode.unpack(rlp.decode(payload))
pong = Pong(ping.endpoint_from, msg_hash, time.time() + 60)
print " sending Pong response: " + str(pong)
self.send(pong, pong.to)
def receive_find_neighbors(self, payload, msg_hash):
print " received FindNeighbors"
print "", FindNeighbors.unpack(rlp.decode(payload))
def receive_neighbors(self, payload, msg_hash):
print " received Neighbors"
print "", Neighbors.unpack(rlp.decode(payload))
def ping(self, endpoint):
ping = PingNode(self.endpoint, endpoint, time.time() + 60)
message = self.wrap_packet(ping)
print "sending " + str(ping)
self.sock.sendto(message,
(endpoint.address.exploded, endpoint.udpPort))
def send(self, packet, endpoint):
message = self.wrap_packet(packet)
print "sending " + str(packet)
self.sock.sendto(message,
(endpoint.address.exploded, endpoint.udpPort))
class PingServer(object):
def __init__(self, my_endpoint):
self.endpoint = my_endpoint
# get private key
priv_key_file = open('priv_key', 'r')
priv_key_serialized = priv_key_file.read()
priv_key_file.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(('0.0.0.0', self.endpoint.udpPort))
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)
payload = sig_serialized[0] + chr(sig_serialized[1]) + payload
payload_hash = keccak256(payload)
return payload_hash + payload
def udp_listen(self):
return threading.Thread(target=self.receive)
def receive(self):
print "listening..."
data, addr = self.sock.recvfrom(1024)
print "received message[", addr, "]"
## decode packet below
## verify hash
msg_hash = data[:32]
if msg_hash != keccak256(data[32:]):
print " First 32 bytes are not keccak256 hash of the rest."
return
else:
print " Verified message hash."
## verify signature
signature = data[32:97]
signed_data = data[97:]
deserialized_sig = self.priv_key.ecdsa_recoverable_deserialize(
signature[:64], ord(signature[64]))
remote_pubkey = self.priv_key.ecdsa_recover(keccak256(signed_data),
deserialized_sig,
raw=True)
pub = PublicKey()
pub.public_key = remote_pubkey
verified = pub.ecdsa_verify(
keccak256(signed_data),
pub.ecdsa_recoverable_convert(deserialized_sig),
raw=True)
if not verified:
print " Signature invalid"
return
else:
print " Verified signature."
response_types = {
PingNode.packet_type: self.receive_ping,
Pong.packet_type: self.receive_pong
}
try:
packet_type = data[97]
dispatch = response_types[packet_type]
except KeyError:
print " Unknown message type: " + data[97]
return
payload = data[98:]
dispatch(payload)
def receive_pong(self, payload):
print " received Pong"
print "", Pong.unpack(rlp.decode(payload))
def receive_ping(self, payload):
print " received Ping"
print "", PingNode.unpack(rlp.decode(payload))
def ping(self, endpoint):
ping = PingNode(self.endpoint, endpoint, time.time() + 60)
message = self.wrap_packet(ping)
print "sending " + str(ping)
self.sock.sendto(message,
(endpoint.address.exploded, endpoint.udpPort))
class PingServer(object):
def __init__(self, my_endpoint):
self.endpoint = my_endpoint
## get private key
priv_key_file = open('priv_key', 'r')
priv_key_serialized = priv_key_file.read()
priv_key_file.close()
self.priv_key = PrivateKey()
self.priv_key.deserialize(priv_key_serialized)
# bind socket
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(('0.0.0.0', self.endpoint.udpPort))
# bind tcp socket
self.tcpsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.tcpsock.bind(('0.0.0.0', self.endpoint.tcpPort))
self.tcpsock.listen(10)
# p2p is the based network
# so, when the p2p network close
# the system need to send a quit blockchain msg to Discover server
def __del__(self):
pass
# # hash || signature || packet-type || packet-data
def wrap_packet(self, packet):
payload = packet.packet_type + rlp.encode(packet.pack())
temp = keccak256(payload)
sig = self.priv_key.ecdsa_sign_recoverable(temp, raw = True)
sig_serialized = self.priv_key.ecdsa_recoverable_serialize(sig)
# signature || packet-type || packet-data
payload = sig_serialized[0] + chr(sig_serialized[1]) + payload
# hash
payload_hash = keccak256(payload)
return payload_hash + payload
def verifyData(self, data):
# verify hash
msg_hash = data[:32]
if msg_hash != keccak256(data[32:]):
print " First 32 bytes are not keccak256 hash of the rest."
return
else:
print " Verified message hash."
# verify signature
signature = data[32:97]
signed_data = data[97:]
deserialized_sig = self.priv_key.ecdsa_recoverable_deserialize(signature[:64], ord(signature[64]))
remote_pubkey = self.priv_key.ecdsa_recover(keccak256(signed_data), deserialized_sig, raw = True)
pub = PublicKey()
pub.public_key = remote_pubkey
verified = pub.ecdsa_verify(keccak256(signed_data),
pub.ecdsa_recoverable_convert(deserialized_sig),
raw = True)
if not verified:
print " Signature invalid"
return False
else:
print " Verified signature."
return True
def recvfrom(self):
try:
print "listening..."
while True :
data, addr = self.sock.recvfrom(1024)
print "recvived mssage[", addr, "]"
res = self.verifyData(data)
if res:
self.dispatch_data(data)
except:
traceback.print_exc()
raise RuntimeError('recvfrom error')
def recvtcpfrom(self, sock):
try:
print "tcp socket listening..."
while (True):
data = sock.recv(1024)
print "【TCP】： get data, data's length is: %d"%len(data)
res = self.verifyData(data)
if res:
self.dispatch_data(data)
except:
traceback.print_exc()
raise RuntimeError('recvtcpfrom error')
# 分裂一个进程
def tcp_listern(self):
try:
while True:
sock, addr = self.tcpsock.accept()
t = threading.Thread(target=self.recvtcpfrom, args=(sock,))
t.setDaemon(True)
t.start()
except:
traceback.print_exc()
raise RuntimeError('tcp_listern error')
# 分裂一个线程来进行对tcp监听
def start_tcp_listern(self):
t = threading.Thread(target=self.tcp_listern)
t.setDaemon(True)
t.start()
def start_udp_listern(self):
# udp listern
listern_thread = self.udp_listen()
listern_thread.start()
def udp_listen(self):
thread = threading.Thread(target= self.recvfrom,)
thread.setDaemon(True)
return thread
def rawsendudpmsg(self, endpoint, message):
self.sock.sendto(message, (endpoint.address.exploded, endpoint.udpPort))
# ping send a hello msg
def ping(self, endpoint):
ping = PingProtrol(self.endpoint, endpoint, time.time())
message = self.wrap_packet(ping)
self.rawsendudpmsg(endpoint, message)
def pong(self, pongNode):
message = self.wrap_packet(pongNode)
self.rawsendudpmsg(pongNode.to, message)
def dispatch_data(self, data):
response_types = {
PingProtrol.packet_type: self.receive_ping,
PongProtrol.packet_type: self.receive_pong,
JoinProtrol.packet_type: self.receive_join,
WelcomeProtrol.packet_type: self.receive_welcome,
InitNodeProtrol.packet_type: self.receive_initnode,
ChainMsgProtrol.packet_type: self.receive_msg
}
try:
packet_type = data[97]
dispatch = response_types[packet_type]
except:
print " Unknown message type: " + data[97]
return
payload = data[98:]
dispatch(payload)
# the function need overrided
def receive_pong(self, payload):
print " received Pong"
print "", PongProtrol.unpack(rlp.decode(payload))
def receive_ping(self, payload):
print " received Ping"
print "", PingProtrol.unpack(rlp.decode(payload))
def receive_join(self, payload):
print " received Join"
print "", JoinProtrol.unpack(rlp.decode(payload))
def receive_welcome(self, payload):
print " received welcome"
print "", JoinProtrol.unpack(rlp.decode(payload))
def receive_initnode(self, payload):
print " received initNode"
print "", JoinProtrol.unpack(rlp.decode(payload))
def receive_msg(self, payload):
print " received msg"
print "", JoinProtrol.unpack(rlp.decode(payload))
# common function
@staticmethod
def SpecialEncode(endpoint):
temp = {
'ip': endpoint.address.exploded,
'port': endpoint.tcpPort
}
return json.dumps(temp)
@staticmethod
def SpecialDecode(msg):
return json.loads(msg)
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
),
]
class Server(object):
def __init__(self, boot_nodes):
# the endpoint of this server
# this is a fake ip address used in packets.
self.endpoint = EndPoint(u'127.0.0.1', 30303, 30303)
# boot nodes
self.boot_nodes = boot_nodes
# hold all of pending
self.pending_hold = []
# last pong received time of the special node id
self.last_pong_received = {}
# last ping received time of the special node id
self.last_ping_received = {}
# have the private key
priv_key_file = open('priv_key', 'r')
priv_key_serialized = priv_key_file.read()
priv_key_file.close()
self.priv_key = PrivateKey()
self.priv_key.deserialize(priv_key_serialized)
# routing table
self.table = RoutingTable(
Node(self.endpoint,
pubkey_format(self.priv_key.pubkey)[1:]), self)
# initialize UDP socket
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(('0.0.0.0', self.endpoint.udpPort))
# set socket non-blocking mode
self.sock.setblocking(0)
def add_table(self, node):
self.table.add_node(node)
def add_pending(self, pending):
pending.start()
self.pending_hold.append(pending)
return pending
def run(self):
gevent.spawn(self.clean_pending)
gevent.spawn(self.listen)
# wait forever
evt = Event()
evt.wait()
def clean_pending(self):
while True:
for pending in list(self.pending_hold):
if not pending.is_alive:
self.pending_hold.remove(pending)
time.sleep(K_REQUEST_TIMEOUT)
def listen(self):
LOGGER.info("{:5} listening...".format(''))
while True:
ready = select([self.sock], [], [], 1.0)
if ready[0]:
data, addr = self.sock.recvfrom(2048)
# non-block data reading
gevent.spawn(self.receive, data, addr)
def receive(self, data, addr):
"""
macSize = 256 / 8 = 32
sigSize = 520 / 8 = 65
headSize = macSize + sigSize = 97
hash, sig, sigdata := buf[:macSize], buf[macSize:headSize], buf[headSize:]
shouldhash := crypto.Sha3(buf[macSize:])
"""
# verify hash
msg_hash = data[:32]
assert msg_hash == keccak256(
data[32:]), "First 32 bytes are not keccak256 hash of the rest"
# verify signature
signature = data[32:97]
signed_data = data[97:]
deserialized_sig = self.priv_key.ecdsa_recoverable_deserialize(
signature[:64], ord(signature[64]))
remote_pubkey = self.priv_key.ecdsa_recover(keccak256(signed_data),
deserialized_sig,
raw=True)
pub = PublicKey()
pub.public_key = remote_pubkey
verified = pub.ecdsa_verify(
keccak256(signed_data),
pub.ecdsa_recoverable_convert(deserialized_sig),
raw=True)
assert verified, "Signature invalid"
pubkey = pubkey_format(pub)[1:]
hex_id = binascii.hexlify(keccak256(pubkey))
packet_type = data[97]
payload = rlp.decode(data[98:])
if packet_type == PingNode.packet_type:
# fake ip in packet
payload[1][0] = addr[0]
ping = PingNode.unpack(payload)
if expired(ping):
return
self.receive_ping(addr, pubkey, ping, msg_hash)
elif packet_type == Pong.packet_type:
pong = Pong.unpack(payload)
if expired(pong):
return
self.receive_pong(addr, pubkey, pong)
elif packet_type == FindNeighbors.packet_type:
fn = FindNeighbors.unpack(payload)
if expired(fn):
return
self.receive_find_neighbors(addr, pubkey, fn)
elif packet_type == Neighbors.packet_type:
neighbours = Neighbors.unpack(payload)
if expired(neighbours):
return
self.receive_neighbors(addr, pubkey, neighbours)
else:
assert False, " Unknown message type: {}".format(packet_type)
def receive_pong(self, addr, pubkey, pong):
remote_id = keccak256(pubkey)
# response to ping
last_pong_received = self.last_pong_received
def match_callback():
# solicited reply
last_pong_received[remote_id] = time.time()
self.handle_reply(addr, pubkey, Pong.packet_type, pong, match_callback)
def receive_ping(self, addr, pubkey, ping, msg_hash):
remote_id = keccak256(pubkey)
endpoint_to = EndPoint(addr[0], ping.endpoint_from.udpPort,
ping.endpoint_from.tcpPort)
pong = Pong(endpoint_to, msg_hash, time.time() + K_EXPIRATION)
node_to = Node(pong.to, pubkey)
# sending Pong response
self.send_sock(pong, node_to)
LOGGER.info("{:5} {}@{}:{} (Pong)".format(
'---->',
binascii.hexlify(node_to.node_id)[:8], addr[0],
ping.endpoint_from.udpPort))
self.handle_reply(addr, pubkey, PingNode.packet_type, ping)
node = Node(endpoint_to, pubkey)
if time.time() - self.last_pong_received.get(remote_id,
0) > K_BOND_EXPIRATION:
self.ping(node, lambda: self.add_table(node))
else:
self.add_table(node)
self.last_ping_received[remote_id] = time.time()
def receive_find_neighbors(self, addr, pubkey, fn):
remote_id = keccak256(pubkey)
if time.time() - self.last_pong_received.get(remote_id,
0) > K_BOND_EXPIRATION:
# lost origin or origin is off
return
target_id = keccak256(fn.target)
closest = self.table.closest(target_id, BUCKET_SIZE)
# sent neighbours in chunks
ns = Neighbors([], time.time() + K_EXPIRATION)
sent = False
node_to = Node(EndPoint(addr[0], addr[1], addr[1]), pubkey)
for c in closest:
ns.nodes.append(c)
if len(ns.nodes) == K_MAX_NEIGHBORS:
self.send_sock(ns, node_to)
LOGGER.info("{:5} {}@{}:{} {}".format(
'---->',
binascii.hexlify(node_to.node_id)[:8], addr[0], addr[1],
ns))
ns.nodes = []
sent = True
if len(ns.nodes) > 0 or not sent:
self.send_sock(ns, node_to)
LOGGER.info("{:5} {}@{}:{} {}".format(
'---->',
binascii.hexlify(node_to.node_id)[:8], addr[0], addr[1], ns))
def receive_neighbors(self, addr, pubkey, neighbours):
# response to find neighbours
self.handle_reply(addr, pubkey, Neighbors.packet_type, neighbours)
def handle_reply(self,
addr,
pubkey,
packet_type,
packet,
match_callback=None):
remote_id = keccak256(pubkey)
is_match = False
for pending in self.pending_hold:
if pending.is_alive and packet_type == pending.packet_type:
if remote_id == pending.from_id:
is_match = True
pending.emit(packet)
match_callback and match_callback()
elif pending.ep is not None and pending.ep == addr:
LOGGER.error('{:5} {}@{}:{} mismatch request {}'.format(
'',
binascii.hexlify(remote_id)[:8], addr[0], addr[1],
binascii.hexlify(pending.from_id)[:8]))
# is_match = True
# pending.emit(packet)
# match_callback and match_callback()
# for bucket in self.table.buckets:
# for node in bucket.nodes:
# if node.node_id == pending.from_id:
# node.set_pubkey(pubkey)
if not is_match:
LOGGER.warning('{:5} {}@{}:{} ({}) unsolicited response'.format(
'<-//-',
binascii.hexlify(remote_id)[:8], addr[0], addr[1],
PACKET_TYPES.get(packet.packet_type)))
def ping(self, node, callback=None):
"""
send a ping request to the given node and return instantly
invoke callback while reply arrives
"""
ping = PingNode(self.endpoint, node.endpoint,
time.time() + K_EXPIRATION)
message = self.wrap_packet(ping)
msg_hash = message[:32]
def reply_call(chunks):
if chunks.pop().echo == msg_hash:
if callback is not None:
callback()
return True
ep = (node.endpoint.address.exploded, node.endpoint.udpPort)
pending = self.add_pending(Pending(node, Pong.packet_type, reply_call))
self.sock.sendto(message, ep)
LOGGER.info("{:5} {}@{}:{} (Ping)".format(
'---->',
binascii.hexlify(node.node_id)[:8], ep[0], ep[1]))
return pending
def find_neighbors(self, node, target_key):
"""
send a find neighbours request to the given node and
waits until the node has sent up to k neighbours
"""
node_id = node.node_id
if time.time() - self.last_ping_received.get(node_id,
0) > K_BOND_EXPIRATION:
send_ping = self.ping(node)
receive_ping = self.add_pending(
Pending(node, PingNode.packet_type, lambda _: True))
# wait until endpoint proof is finished
gevent.joinall([send_ping, receive_ping])
fn = FindNeighbors(target_key, time.time() + K_EXPIRATION)
def reply_call(chunks):
num_received = 0
for neighbors in chunks:
num_received += len(neighbors.nodes)
if num_received >= BUCKET_SIZE:
return True
pending = self.add_pending(
Pending(node, Neighbors.packet_type, reply_call, timeout=2))
self.send_sock(fn, node)
ep = (node.endpoint.address.exploded, node.endpoint.udpPort)
LOGGER.info("{:5} {}@{}:{} (FN {})".format(
'---->',
binascii.hexlify(node.node_id)[:8], ep[0], ep[1],
binascii.hexlify(keccak256(fn.target))[:8]))
# block to wait for neighbours
ret = pending.get()
if ret:
neighbor_nodes = []
for chunk in ret:
for n in chunk.nodes:
neighbor_nodes.append(n)
return neighbor_nodes
def send_sock(self, packet, node):
endpoint = node.endpoint
message = self.wrap_packet(packet)
ep = (endpoint.address.exploded, endpoint.udpPort)
self.sock.sendto(message, ep)
def wrap_packet(self, packet):
"""
UDP packets are structured as follows:
hash || signature || packet-type || packet-data
packet-type: single byte < 2**7 // valid values are [1,4]
packet-data: RLP encoded list. Packet properties are serialized in the order in
which they're defined. See packet-data below.
Offset |
0 | MDC | Ensures integrity of packet,
65 | signature | Ensures authenticity of sender, `SIGN(sender-privkey, MDC)`
97 | type | Single byte in range [1, 4] that determines the structure of Data
98 | data | RLP encoded, see section Packet Data
The packets are signed and authenticated. The sender's Node ID is determined by
recovering the public key from the signature.
sender-pubkey = ECRECOVER(Signature)
The integrity of the packet can then be verified by computing the
expected MDC of the packet as:
MDC = SHA3(sender-pubkey || type || data)
As an optimization, implementations may look up the public key by
the UDP sending address and compute MDC before recovering the sender ID.
If the MDC values do not match, the packet can be dropped.
"""
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)
payload = sig_serialized[0] + chr(sig_serialized[1]) + payload
payload_hash = keccak256(payload)
return payload_hash + payload
class Server(object):
def __init__(self, my_endpoint):
self.endpoint = my_endpoint
# 获取私钥
priv_key_file = open('priv_key', 'r')
priv_key_serialized = priv_key_file.read()
priv_key_file.close()
self.priv_key = PrivateKey()
self.priv_key.deserialize(priv_key_serialized)
# 初始化套接字
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(('0.0.0.0', self.endpoint.udpPort))
# set socket non-blocking mode
self.sock.setblocking(0)
def wrap_packet(self, packet):
"""
UDP packets are structured as follows:
hash || signature || packet-type || packet-data
packet-type: single byte < 2**7 // valid values are [1,4]
packet-data: RLP encoded list. Packet properties are serialized in the order in
which they're defined. See packet-data below.
Offset |
0 | MDC | Ensures integrity of packet,
65 | signature | Ensures authenticity of sender, `SIGN(sender-privkey, MDC)`
97 | type | Single byte in range [1, 4] that determines the structure of Data
98 | data | RLP encoded, see section Packet Data
The packets are signed and authenticated. The sender's Node ID is determined by
recovering the public key from the signature.
sender-pubkey = ECRECOVER(Signature)
The integrity of the packet can then be verified by computing the
expected MDC of the packet as:
MDC = SHA3(sender-pubkey || type || data)
As an optimization, implementations may look up the public key by
the UDP sending address and compute MDC before recovering the sender ID.
If the MDC values do not match, the packet can be dropped.
"""
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)
payload = sig_serialized[0] + chr(sig_serialized[1]) + payload
payload_hash = keccak256(payload)
return payload_hash + payload
def listen(self):
print "listening..."
while True:
ready = select.select([self.sock], [], [], 1.0)
if ready[0]:
data, addr = self.sock.recvfrom(2048)
print "received message[", addr, "]:"
self.receive(data, addr)
def listen_thread(self):
thread = threading.Thread(target=self.listen)
thread.daemon = True
return thread
def receive(self, data, addr):
"""
macSize = 256 / 8 = 32
sigSize = 520 / 8 = 65
headSize = macSize + sigSize = 97
hash, sig, sigdata := buf[:macSize], buf[macSize:headSize], buf[headSize:]
shouldhash := crypto.Sha3(buf[macSize:])
"""
# verify hash
msg_hash = data[:32]
if msg_hash != keccak256(data[32:]):
print " First 32 bytes are not keccak256 hash of the rest."
return
else:
print " Verified message hash."
# verify signature
signature = data[32:97]
signed_data = data[97:]
deserialized_sig = self.priv_key.ecdsa_recoverable_deserialize(signature[:64],
ord(signature[64]))
remote_pubkey = self.priv_key.ecdsa_recover(keccak256(signed_data),
deserialized_sig,
raw=True)
pub = PublicKey()
pub.public_key = remote_pubkey
verified = pub.ecdsa_verify(keccak256(signed_data),
pub.ecdsa_recoverable_convert(deserialized_sig),
raw=True)
if not verified:
print " Signature invalid"
return
else:
print " Verified signature."
response_types = {
PingNode.packet_type: self.receive_ping,
Pong.packet_type: self.receive_pong,
FindNeighbors.packet_type: self.receive_find_neighbors,
Neighbors.packet_type: self.receive_neighbors
}
try:
packet_type = data[97]
dispatch = response_types[packet_type]
except KeyError:
print " Unknown message type: " + data[97]
return
payload = data[98:]
dispatch(payload, msg_hash, addr)
def receive_pong(self, payload, msg_hash, addr):
print " received Pong"
print "", Pong.unpack(rlp.decode(payload))
def receive_ping(self, payload, msg_hash, addr):
print " received Ping"
ping = PingNode.unpack(rlp.decode(payload))
endpoint_to = EndPoint(addr[0], ping.endpoint_from.udpPort, ping.endpoint_from.tcpPort)
pong = Pong(endpoint_to, msg_hash, time.time() + 60)
print " sending Pong response: " + str(pong)
self.send(pong, pong.to)
def receive_find_neighbors(self, payload, msg_hash, addr):
print " received FindNeighbors"
print "", FindNeighbors.unpack(rlp.decode(payload))
def receive_neighbors(self, payload, msg_hash, addr):
print " received Neighbors"
print "", Neighbors.unpack(rlp.decode(payload))
def ping(self, endpoint):
ping = PingNode(self.endpoint, endpoint, time.time() + 60)
message = self.wrap_packet(ping)
print "sending " + str(ping)
self.sock.sendto(message, (endpoint.address.exploded, endpoint.udpPort))
def send(self, packet, endpoint):
message = self.wrap_packet(packet)
print "sending " + str(packet)
self.sock.sendto(message, (endpoint.address.exploded, endpoint.udpPort))