672 lines
22 KiB
Nim
672 lines
22 KiB
Nim
#
|
|
# Ethereum P2P
|
|
# (c) Copyright 2018
|
|
# Status Research & Development GmbH
|
|
#
|
|
# Licensed under either of
|
|
# Apache License, version 2.0, (LICENSE-APACHEv2)
|
|
# MIT license (LICENSE-MIT)
|
|
#
|
|
|
|
import macros, sets, algorithm, logging, hashes
|
|
import rlp, ranges/[stackarrays, ptr_arith], eth_keys, ethereum_types,
|
|
nimcrypto, asyncdispatch2
|
|
import kademlia, discovery, auth, rlpxcrypt, enode
|
|
|
|
type
|
|
ConnectionState = enum
|
|
None,
|
|
Connected,
|
|
Disconnecting,
|
|
Disconnected
|
|
|
|
Peer* = ref object
|
|
transp: StreamTransport
|
|
dispatcher: Dispatcher
|
|
networkId: int
|
|
secretsState: SecretState
|
|
connectionState: ConnectionState
|
|
protocolStates: seq[RootRef]
|
|
remote*: Node
|
|
|
|
MessageHandler* = proc(x: Peer, data: var Rlp)
|
|
|
|
MessageInfo* = object
|
|
id*: int
|
|
name*: string
|
|
thunk*: MessageHandler
|
|
|
|
CapabilityName* = array[3, char]
|
|
|
|
Capability* = object
|
|
name*: CapabilityName
|
|
version*: int
|
|
|
|
ProtocolInfo* = ref object
|
|
name*: CapabilityName
|
|
version*: int
|
|
messages*: seq[MessageInfo]
|
|
index: int # the position of the protocol in the
|
|
# ordered list of supported protocols
|
|
|
|
Dispatcher = ref object
|
|
# The dispatcher stores the mapping of negotiated message IDs between
|
|
# two connected peers. The dispatcher objects are shared between
|
|
# connections running with the same set of supported protocols.
|
|
#
|
|
# `protocolOffsets` will hold one slot of each locally supported
|
|
# protocol. If the other peer also supports the protocol, the stored
|
|
# offset indicates the numeric value of the first message of the protocol
|
|
# (for this particular connection). If the other peer doesn't support the
|
|
# particular protocol, the stored offset is -1.
|
|
#
|
|
# `thunks` holds a mapping from valid message IDs to their handler procs.
|
|
#
|
|
protocolOffsets: seq[int]
|
|
thunks: seq[MessageHandler]
|
|
|
|
UnsupportedProtocol* = object of Exception
|
|
# This is raised when you attempt to send a message from a particular
|
|
# protocol to a peer that doesn't support the protocol.
|
|
|
|
MalformedMessageError* = object of Exception
|
|
|
|
const
|
|
baseProtocolVersion = 4
|
|
|
|
# TODO: Usage of this variables causes GCSAFE problems.
|
|
var
|
|
gProtocols: seq[ProtocolInfo]
|
|
gCapabilities: seq[Capability]
|
|
gDispatchers = initSet[Dispatcher]()
|
|
devp2p: ProtocolInfo
|
|
|
|
# The variables above are immutable RTTI information. We need to tell
|
|
# Nim to not consider them GcSafe violations:
|
|
template rlpxProtocols: auto = {.gcsafe.}: gProtocols
|
|
template rlpxCapabilities: auto = {.gcsafe.}: gCapabilities
|
|
template devp2pProtocolInfo: auto = {.gcsafe.}: devp2p
|
|
|
|
# Dispatcher
|
|
#
|
|
|
|
proc `$`*(p: Peer): string {.inline.} = $p.remote
|
|
|
|
proc hash(d: Dispatcher): int =
|
|
hash(d.protocolOffsets)
|
|
|
|
proc `==`(lhs, rhs: Dispatcher): bool =
|
|
lhs.protocolOffsets == rhs.protocolOffsets
|
|
|
|
proc describeProtocols(d: Dispatcher): string =
|
|
result = ""
|
|
for i in 0 ..< rlpxProtocols.len:
|
|
if d.protocolOffsets[i] != -1:
|
|
if result.len != 0: result.add(',')
|
|
for c in rlpxProtocols[i].name: result.add(c)
|
|
|
|
proc getDispatcher(otherPeerCapabilities: openarray[Capability]): Dispatcher =
|
|
# XXX: sub-optimal solution until progress is made here:
|
|
# https://github.com/nim-lang/Nim/issues/7457
|
|
# We should be able to find an existing dispatcher without allocating a new one
|
|
|
|
new(result)
|
|
newSeq(result.protocolOffsets, rlpxProtocols.len)
|
|
|
|
var nextUserMsgId = 0x10
|
|
|
|
for i in 0 ..< rlpxProtocols.len:
|
|
let localProtocol = rlpxProtocols[i]
|
|
|
|
block findMatchingProtocol:
|
|
for remoteCapability in otherPeerCapabilities:
|
|
if localProtocol.name == remoteCapability.name and
|
|
localProtocol.version == remoteCapability.version:
|
|
result.protocolOffsets[i] = nextUserMsgId
|
|
nextUserMsgId += localProtocol.messages.len
|
|
break findMatchingProtocol
|
|
# the local protocol is not supported by the other peer
|
|
# indicate this by a -1 offset:
|
|
result.protocolOffsets[i] = -1
|
|
|
|
if result in gDispatchers:
|
|
return gDispatchers[result]
|
|
else:
|
|
template copyTo(src, dest; index: int) =
|
|
for i in 0 ..< src.len:
|
|
dest[index + i] = src[i].thunk
|
|
|
|
result.thunks = newSeq[MessageHandler](nextUserMsgId)
|
|
devp2pProtocolInfo.messages.copyTo(result.thunks, 0)
|
|
|
|
for i in 0 ..< rlpxProtocols.len:
|
|
if result.protocolOffsets[i] != -1:
|
|
rlpxProtocols[i].messages.copyTo(result.thunks, result.protocolOffsets[i])
|
|
|
|
gDispatchers.incl result
|
|
|
|
# Protocol info objects
|
|
#
|
|
|
|
proc newProtocol(name: string, version: int): ProtocolInfo =
|
|
new result
|
|
result.name[0] = name[0]
|
|
result.name[1] = name[1]
|
|
result.name[2] = name[2]
|
|
result.version = version
|
|
result.messages = @[]
|
|
|
|
proc nameStr*(p: ProtocolInfo): string =
|
|
result = newStringOfCap(3)
|
|
for c in p.name: result.add(c)
|
|
|
|
proc cmp*(lhs, rhs: ProtocolInfo): int {.inline.} =
|
|
for i in 0..2:
|
|
if lhs.name[i] != rhs.name[i]:
|
|
return int16(lhs.name[i]) - int16(rhs.name[i])
|
|
return 0
|
|
|
|
proc registerMsg(protocol: var ProtocolInfo,
|
|
id: int, name: string, thunk: MessageHandler) =
|
|
protocol.messages.add MessageInfo(id: id, name: name, thunk: thunk)
|
|
|
|
proc registerProtocol(protocol: ProtocolInfo) =
|
|
# XXX: This can be done at compile-time in the future
|
|
if protocol.version > 0:
|
|
if gProtocols.isNil: gProtocols = @[]
|
|
if gCapabilities.isNil: gCapabilities = @[]
|
|
let pos = lowerBound(gProtocols, protocol)
|
|
gProtocols.insert(protocol, pos)
|
|
gCapabilities.insert(Capability(name: protocol.name, version: protocol.version), pos)
|
|
for i in 0 ..< gProtocols.len:
|
|
gProtocols[i].index = i
|
|
else:
|
|
devp2p = protocol
|
|
|
|
# RLP serialization
|
|
#
|
|
|
|
proc append*(rlpWriter: var RlpWriter, hash: KeccakHash) =
|
|
rlpWriter.append(hash.data)
|
|
|
|
proc read*(rlp: var Rlp, T: typedesc[KeccakHash]): T =
|
|
result.data = rlp.read(type(result.data))
|
|
|
|
# Message composition and encryption
|
|
#
|
|
|
|
proc writeMsgId(p: ProtocolInfo, msgId: int, peer: Peer,
|
|
rlpOut: var RlpWriter) =
|
|
let baseMsgId = peer.dispatcher.protocolOffsets[p.index]
|
|
if baseMsgId == -1:
|
|
raise newException(UnsupportedProtocol,
|
|
p.nameStr & " is not supported by peer " &
|
|
$peer.remote.id)
|
|
rlpOut.append(baseMsgId + msgId)
|
|
|
|
proc dispatchMsg(peer: Peer, msgId: int, msgData: var Rlp) =
|
|
template invalidIdError: untyped =
|
|
raise newException(ValueError,
|
|
"RLPx message with an invalid id " & $msgId &
|
|
" on a connection supporting " & peer.dispatcher.describeProtocols)
|
|
|
|
if msgId >= peer.dispatcher.thunks.len: invalidIdError()
|
|
let thunk = peer.dispatcher.thunks[msgId]
|
|
if thunk == nil: invalidIdError()
|
|
|
|
thunk(peer, msgData)
|
|
|
|
proc send(p: Peer, data: BytesRange) {.async.} =
|
|
# var rlp = rlpFromBytes(data)
|
|
# echo "sending: ", rlp.read(int)
|
|
# echo "payload: ", rlp.inspect
|
|
var cipherText = encryptMsg(data, p.secretsState)
|
|
var res = await p.transp.write(cipherText)
|
|
|
|
proc recvMsg*(peer: Peer): Future[tuple[msgId: int, msgData: Rlp]] {.async.} =
|
|
## This procs awaits the next complete RLPx message in the TCP stream
|
|
|
|
var headerBytes: array[32, byte]
|
|
await peer.transp.readExactly(addr headerBytes[0], 32)
|
|
|
|
var msgSize: int
|
|
if decryptHeaderAndGetMsgSize(peer.secretsState,
|
|
headerBytes, msgSize) != RlpxStatus.Success:
|
|
return (-1, zeroBytesRlp)
|
|
|
|
let remainingBytes = encryptedLength(msgSize) - 32
|
|
# XXX: Migrate this to a thread-local seq
|
|
var encryptedBytes = newSeq[byte](remainingBytes)
|
|
await peer.transp.readExactly(addr encryptedBytes[0], len(encryptedBytes))
|
|
|
|
let decryptedMaxLength = decryptedLength(msgSize)
|
|
var
|
|
decryptedBytes = newSeq[byte](decryptedMaxLength)
|
|
decryptedBytesCount = 0
|
|
|
|
if decryptBody(peer.secretsState, encryptedBytes, msgSize,
|
|
decryptedBytes, decryptedBytesCount) != RlpxStatus.Success:
|
|
return (-1, zeroBytesRlp)
|
|
|
|
decryptedBytes.setLen(decryptedBytesCount)
|
|
var rlp = rlpFromBytes(decryptedBytes.toRange)
|
|
let msgId = rlp.read(int)
|
|
return (msgId, rlp)
|
|
|
|
proc nextMsg*(peer: Peer, MsgType: typedesc,
|
|
discardOthers = false): Future[MsgType] {.async.} =
|
|
## This procs awaits a specific RLPx message.
|
|
## By default, other messages will be automatically dispatched
|
|
## to their responsive handlers unless `discardOthers` is set to
|
|
## true. This may be useful when the protocol requires a very
|
|
## specific response to a given request. Use with caution.
|
|
const wantedId = MsgType.msgId
|
|
|
|
while true:
|
|
var (nextMsgId, nextMsgData) = await peer.recvMsg()
|
|
# echo "got msg(", nextMsgId, "): ", nextMsgData.inspect
|
|
if nextMsgId == wantedId:
|
|
return nextMsgData.read(MsgType)
|
|
elif not discardOthers:
|
|
if nextMsgData.listLen != 0:
|
|
nextMsgData = nextMsgData.listElem(0)
|
|
peer.dispatchMsg(nextMsgId, nextMsgData)
|
|
|
|
iterator typedParams(n: NimNode, skip = 0): (NimNode, NimNode) =
|
|
for i in (1 + skip) ..< n.params.len:
|
|
let paramNodes = n.params[i]
|
|
let paramType = paramNodes[^2]
|
|
|
|
for j in 0 ..< paramNodes.len - 2:
|
|
yield (paramNodes[j], paramType)
|
|
|
|
proc chooseFieldType(n: NimNode): NimNode =
|
|
## Examines the parameter types used in the message signature
|
|
## and selects the corresponding field type for use in the
|
|
## message object type (i.e. `p2p.hello`).
|
|
##
|
|
## For now, only openarray types are remapped to sequences.
|
|
result = n
|
|
if n.kind == nnkBracketExpr and eqIdent(n[0], "openarray"):
|
|
result = n.copyNimTree
|
|
result[0] = newIdentNode("seq")
|
|
|
|
proc getState(peer: Peer, proto: ProtocolInfo): RootRef =
|
|
peer.protocolStates[proto.index]
|
|
|
|
template state*(connection: Peer, Protocol: typedesc): untyped =
|
|
## Returns the state object of a particular protocol for a
|
|
## particular connection.
|
|
cast[ref Protocol.State](connection.getState(Protocol.protocolInfo))
|
|
|
|
macro rlpxProtocol*(protoIdentifier: untyped,
|
|
version: static[int],
|
|
body: untyped): untyped =
|
|
## The macro used to defined RLPx sub-protocols. See README.
|
|
var
|
|
protoName = $protoIdentifier
|
|
protoNameIdent = newIdentNode(protoName)
|
|
nextId = BiggestInt 0
|
|
protocol = genSym(nskVar, protoName & "Proto")
|
|
newProtocol = bindSym "newProtocol"
|
|
rlpFromBytes = bindSym "rlpFromBytes"
|
|
read = bindSym "read"
|
|
initRlpWriter = bindSym "initRlpWriter"
|
|
finish = bindSym "finish"
|
|
append = bindSym "append"
|
|
send = bindSym "send"
|
|
Peer = bindSym "Peer"
|
|
writeMsgId = bindSym "writeMsgId"
|
|
isSubprotocol = version > 0
|
|
stateType: NimNode = nil
|
|
msgThunksAndRegistrations = newNimNode(nnkStmtList)
|
|
|
|
# By convention, all Ethereum protocol names must be abbreviated to 3 letters
|
|
assert protoName.len == 3
|
|
|
|
result = newNimNode(nnkStmtList)
|
|
result.add quote do:
|
|
# One global variable per protocol holds the protocol run-time data
|
|
var `protocol` = `newProtocol`(`protoName`, `version`)
|
|
|
|
# Create a type actining as a pseudo-object representing the protocol (e.g. p2p)
|
|
type `protoNameIdent`* = object
|
|
|
|
# The protocol run-time data is available as a pseudo-field (e.g. `p2p.protocolInfo`)
|
|
template protocolInfo*(P: type `protoNameIdent`): ProtocolInfo = `protocol`
|
|
|
|
for n in body:
|
|
case n.kind
|
|
of {nnkCall, nnkCommand}:
|
|
if n.len == 2 and eqIdent(n[0], "nextID"):
|
|
if n[1].kind == nnkIntLit:
|
|
nextId = n[1].intVal
|
|
else:
|
|
error("nextID expects a single int value", n)
|
|
else:
|
|
error(repr(n) & " is not a recognized call in RLPx protocol definitions", n)
|
|
of nnkTypeSection:
|
|
if n.len == 1 and eqIdent(n[0][0], "State"):
|
|
stateType = genSym(nskType, protoName & "State")
|
|
n[0][0] = stateType
|
|
result.add n
|
|
# Create a pseudo-field for the protocol State type (e.g. `p2p.State`)
|
|
result.add quote do:
|
|
template State*(P: type `protoNameIdent`): typedesc = `stateType`
|
|
else:
|
|
error("The only type that can be defined inside a RLPx protocol is the protocol's State type.")
|
|
|
|
of nnkProcDef:
|
|
let
|
|
msgIdent = n.name
|
|
msgName = $n.name
|
|
|
|
var
|
|
thunkName = newNilLit()
|
|
rlpWriter = genSym(nskVar, "writer")
|
|
appendParams = newNimNode(nnkStmtList)
|
|
peer = genSym(nskParam, "peer")
|
|
|
|
if n.body.kind != nnkEmpty:
|
|
# implement the receiving thunk proc that deserialzed the
|
|
# message parameters and calls the user proc:
|
|
var
|
|
nCopy = n.copyNimTree
|
|
rlp = genSym(nskParam, "rlp")
|
|
connection = genSym(nskParam, "connection")
|
|
|
|
nCopy.name = genSym(nskProc, msgName)
|
|
var callUserProc = newCall(nCopy.name, connection)
|
|
|
|
var readParams = newNimNode(nnkStmtList)
|
|
|
|
for i in 2 ..< n.params.len: # we skip the return type and the
|
|
# first param of type Peer
|
|
let paramNodes = n.params[i]
|
|
let paramType = paramNodes[^2]
|
|
|
|
for j in 0 ..< paramNodes.len - 2:
|
|
var deserializedParam = genSym(nskLet)
|
|
|
|
readParams.add quote do:
|
|
let `deserializedParam` = `read`(`rlp`, `paramType`)
|
|
|
|
callUserProc.add deserializedParam
|
|
|
|
thunkName = newIdentNode(msgName & "_thunk")
|
|
var thunk = quote do:
|
|
proc `thunkName`(`connection`: `Peer`, `rlp`: var Rlp) =
|
|
`readParams`
|
|
`callUserProc`
|
|
|
|
if stateType != nil:
|
|
# Define a local accessor for the current protocol state
|
|
# inside each handler (e.g. peer.state.foo = bar)
|
|
var localStateAccessor = quote:
|
|
template state(connection: `Peer`): ref `stateType` =
|
|
cast[ref `stateType`](connection.getState(`protocol`))
|
|
|
|
nCopy.body.insert 0, localStateAccessor
|
|
|
|
msgThunksAndRegistrations.add(nCopy, thunk)
|
|
|
|
var
|
|
msgType = genSym(nskType, msgName & "Obj")
|
|
msgTypeFields = newTree(nnkRecList)
|
|
msgTypeBody = newTree(nnkObjectTy,
|
|
newEmptyNode(),
|
|
newEmptyNode(),
|
|
msgTypeFields)
|
|
|
|
var paramCount = 0
|
|
# implement sending proc
|
|
for param, paramType in n.typedParams(skip = 1):
|
|
inc paramCount
|
|
appendParams.add quote do:
|
|
`append`(`rlpWriter`, `param`)
|
|
|
|
msgTypeFields.add newTree(nnkIdentDefs,
|
|
param, chooseFieldType(paramType), newEmptyNode())
|
|
|
|
result.add quote do:
|
|
# This is a type featuring a single field for each message param:
|
|
type `msgType`* = `msgTypeBody`
|
|
|
|
# Add a helper template for accessing the message type:
|
|
# e.g. p2p.hello:
|
|
template `msgIdent`*(T: type `protoNameIdent`): typedesc = `msgType`
|
|
|
|
# Add a helper template for obtaining the message Id for
|
|
# a particular message type:
|
|
template msgId*(T: type `msgType`): int = `nextId`
|
|
|
|
# XXX TODO: check that the first param has the correct type
|
|
n.params[1][0] = peer
|
|
# echo n.params.treeRepr
|
|
n.params[0] = newTree(nnkBracketExpr,
|
|
newIdentNode("Future"), newIdentNode("void"))
|
|
|
|
let writeMsgId = if isSubprotocol:
|
|
quote: `writeMsgId`(`protocol`, `nextId`, `peer`, `rlpWriter`)
|
|
else:
|
|
quote: `append`(`rlpWriter`, `nextId`)
|
|
|
|
let paramCountNode = newLit(paramCount)
|
|
n.body = quote do:
|
|
var `rlpWriter` = `initRlpWriter`()
|
|
`writeMsgId`
|
|
`rlpWriter`.startList(`paramCountNode`)
|
|
`appendParams`
|
|
return `send`(`peer`, `finish`(`rlpWriter`))
|
|
|
|
result.add n
|
|
msgThunksAndRegistrations.add newCall(bindSym("registerMsg"),
|
|
protocol,
|
|
newIntLitNode(nextId),
|
|
newStrLitNode($n.name),
|
|
thunkName)
|
|
|
|
inc nextId
|
|
else:
|
|
error("illegal syntax in a RLPx protocol definition", n)
|
|
|
|
result.add(msgThunksAndRegistrations)
|
|
result.add newCall(bindSym("registerProtocol"), protocol)
|
|
when isMainModule: echo repr(result)
|
|
|
|
type
|
|
DisconnectionReason* = enum
|
|
DisconnectRequested,
|
|
TcpError,
|
|
BreachOfProtocol,
|
|
UselessPeer,
|
|
TooManyPeers,
|
|
AlreadyConnected,
|
|
IncompatibleProtocolVersion,
|
|
NullNodeIdentityReceived,
|
|
ClientQuitting,
|
|
UnexpectedIdentity,
|
|
SelfConnection,
|
|
MessageTimeout,
|
|
SubprotocolReason = 0x10
|
|
|
|
rlpxProtocol p2p, 0:
|
|
proc hello(peer: Peer,
|
|
version: uint,
|
|
clientId: string,
|
|
capabilities: openarray[Capability],
|
|
listenPort: uint,
|
|
nodeId: array[RawPublicKeySize, byte]) =
|
|
# peer.id = nodeId
|
|
peer.dispatcher = getDispatcher(capabilities)
|
|
|
|
proc disconnect(peer: Peer, reason: DisconnectionReason)
|
|
|
|
proc ping(peer: Peer) =
|
|
discard peer.pong()
|
|
|
|
proc pong(peer: Peer) =
|
|
discard
|
|
|
|
template `^`(arr): auto =
|
|
# passes a stack array with a matching `arrLen`
|
|
# variable as an open array
|
|
arr.toOpenArray(0, `arr Len` - 1)
|
|
|
|
proc validatePubKeyInHello(msg: p2p.hello, pubKey: PublicKey): bool =
|
|
var pk: PublicKey
|
|
recoverPublicKey(msg.nodeId, pk) == EthKeysStatus.Success and pk == pubKey
|
|
|
|
proc check(status: AuthStatus) =
|
|
if status != AuthStatus.Success:
|
|
raise newException(Exception, "Error: " & $status)
|
|
|
|
proc connectionEstablished(p: Peer, h: p2p.hello) =
|
|
p.dispatcher = getDispatcher(h.capabilities)
|
|
# p.id = h.nodeId
|
|
p.connectionState = Connected
|
|
newSeq(p.protocolStates, rlpxProtocols.len)
|
|
# XXX: initialize the sub-protocol states
|
|
|
|
proc initSecretState(hs: var Handshake, authMsg, ackMsg: openarray[byte],
|
|
p: Peer) =
|
|
var secrets: ConnectionSecret
|
|
check hs.getSecrets(authMsg, ackMsg, secrets)
|
|
initSecretState(secrets, p.secretsState)
|
|
burnMem(secrets)
|
|
|
|
proc rlpxConnect*(remote: Node, myKeys: KeyPair, listenPort: Port,
|
|
clientId: string): Future[Peer] {.async.} =
|
|
new result
|
|
result.remote = remote
|
|
let ta = initTAddress(remote.node.address.ip, remote.node.address.tcpPort)
|
|
try:
|
|
result.transp = await connect(ta)
|
|
|
|
var handshake = newHandshake({Initiator})
|
|
handshake.host = myKeys
|
|
|
|
var authMsg: array[AuthMessageMaxEIP8, byte]
|
|
var authMsgLen = 0
|
|
check authMessage(handshake, remote.node.pubkey, authMsg, authMsgLen)
|
|
var res = result.transp.write(addr authMsg[0], authMsgLen)
|
|
|
|
let initialSize = handshake.expectedLength
|
|
var ackMsg = newSeqOfCap[byte](1024)
|
|
ackMsg.setLen(initialSize)
|
|
|
|
await result.transp.readExactly(addr ackMsg[0], len(ackMsg))
|
|
|
|
var ret = handshake.decodeAckMessage(ackMsg)
|
|
if ret == AuthStatus.IncompleteError:
|
|
ackMsg.setLen(handshake.expectedLength)
|
|
await result.transp.readExactly(addr ackMsg[initialSize],
|
|
len(ackMsg) - initialSize)
|
|
ret = handshake.decodeAckMessage(ackMsg)
|
|
check ret
|
|
|
|
initSecretState(handshake, ^authMsg, ackMsg, result)
|
|
|
|
# if handshake.remoteHPubkey != remote.node.pubKey:
|
|
# raise newException(Exception, "Remote pubkey is wrong")
|
|
|
|
discard result.hello(baseProtocolVersion, clientId, rlpxCapabilities,
|
|
uint(listenPort), myKeys.pubkey.getRaw())
|
|
|
|
var response = await result.nextMsg(p2p.hello, discardOthers = true)
|
|
|
|
if not validatePubKeyInHello(response, remote.node.pubKey):
|
|
warn "Remote nodeId is not its public key" # XXX: Do we care?
|
|
|
|
connectionEstablished(result, response)
|
|
except:
|
|
if not isNil(result.transp):
|
|
result.transp.close()
|
|
|
|
proc rlpxAccept*(transp: StreamTransport, myKeys: KeyPair,
|
|
clientId: string): Future[Peer] {.async.} =
|
|
new result
|
|
result.transp = transp
|
|
var handshake = newHandshake({Responder})
|
|
handshake.host = myKeys
|
|
|
|
try:
|
|
let initialSize = handshake.expectedLength
|
|
var authMsg = newSeqOfCap[byte](1024)
|
|
authMsg.setLen(initialSize)
|
|
await transp.readExactly(addr authMsg[0], len(authMsg))
|
|
var ret = handshake.decodeAuthMessage(authMsg)
|
|
if ret == AuthStatus.IncompleteError: # Eip8 auth message is likely
|
|
authMsg.setLen(handshake.expectedLength)
|
|
await transp.readExactly(addr authMsg[initialSize],
|
|
len(authMsg) - initialSize)
|
|
ret = handshake.decodeAuthMessage(authMsg)
|
|
check ret
|
|
|
|
var ackMsg: array[AckMessageMaxEIP8, byte]
|
|
var ackMsgLen: int
|
|
check handshake.ackMessage(ackMsg, ackMsgLen)
|
|
var res = transp.write(addr ackMsg[0], ackMsgLen)
|
|
|
|
initSecretState(handshake, authMsg, ^ackMsg, result)
|
|
|
|
var response = await result.nextMsg(p2p.hello, discardOthers = true)
|
|
let listenPort = transp.localAddress().port
|
|
discard result.hello(baseProtocolVersion, clientId,
|
|
rlpxCapabilities, listenPort.uint,
|
|
myKeys.pubkey.getRaw())
|
|
|
|
if validatePubKeyInHello(response, handshake.remoteHPubkey):
|
|
warn "Remote nodeId is not its public key" # XXX: Do we care?
|
|
|
|
let port = Port(response.listenPort)
|
|
let remote = transp.remoteAddress()
|
|
let address = Address(ip: remote.address, tcpPort: remote.port,
|
|
udpPort: remote.port)
|
|
result.remote = newNode(initEnode(handshake.remoteHPubkey, address))
|
|
|
|
connectionEstablished(result, response)
|
|
except:
|
|
transp.close()
|
|
|
|
when isMainModule:
|
|
import rlp
|
|
|
|
rlpxProtocol aaa, 1:
|
|
type State = object
|
|
peerName: string
|
|
|
|
proc hi(p: Peer, name: string) =
|
|
p.state.peerName = name
|
|
|
|
rlpxProtocol bbb, 1:
|
|
type State = object
|
|
messages: int
|
|
|
|
proc foo(p: Peer, s: string, a, z: int) =
|
|
p.state.messages += 1
|
|
echo p.state(aaa).peerName
|
|
|
|
proc bar(p: Peer, i: int, s: string)
|
|
|
|
var p = Peer()
|
|
discard p.bar(10, "test")
|
|
|
|
when false:
|
|
# The assignments below can be used to investigate if the RLPx procs
|
|
# are considered GcSafe. The short answer is that they aren't, because
|
|
# they dispatch into user code that might use the GC.
|
|
type
|
|
GcSafeDispatchMsg = proc (peer: Peer, msgId: int, msgData: var Rlp)
|
|
|
|
GcSafeRecvMsg = proc (peer: Peer):
|
|
Future[tuple[msgId: int, msgData: Rlp]] {.gcsafe.}
|
|
|
|
GcSafeAccept = proc (transp: StreamTransport, myKeys: KeyPair):
|
|
Future[Peer] {.gcsafe.}
|
|
|
|
var
|
|
dispatchMsgPtr = dispatchMsg
|
|
recvMsgPtr: GcSafeRecvMsg = recvMsg
|
|
acceptPtr: GcSafeAccept = rlpxAccept
|