mirror of https://github.com/status-im/nim-eth.git
Removed obsolete chunked rlpx message protocol extension (#719)
This commit is contained in:
Jordan Hrycaj
GitHub
parent
56f72c7a66
commit
9511502273
130
eth/p2p/rlpx.nim
130
eth/p2p/rlpx.nim
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@ -13,17 +13,6 @@ import
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".."/[rlp, common, keys, async_utils],
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./private/p2p_types, "."/[kademlia, auth, rlpxcrypt, enode, p2p_protocol_dsl]
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const
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# Insane kludge for supporting chunked messages when syncing against clients
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# like Nethermind.
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#
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# The original specs which are now obsoleted can be found here:
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# github.com/ethereum/devp2p/commit/6504d410bc4b8dda2b43941e1cb48c804b90cf22.
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#
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# The current requirement is stated at
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# github.com/ethereum/devp2p/blob/master/rlpx.md#framing
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allowObsoletedChunkedMessages = defined(chunked_rlpx_enabled)
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# TODO: This doesn't get enabled currently in any of the builds, so we send a
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# devp2p protocol handshake message with version. Need to check if some peers
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# drop us because of this.
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@ -510,42 +499,6 @@ proc resolveResponseFuture(peer: Peer, msgId: int, msg: pointer, reqId: int) =
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debug "late or duplicate reply for a RLPx request"
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proc getRlpxHeaderData(header: RlpxHeader): (int,int,int) =
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## Helper for `recvMsg()`
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# This is insane. Some clients like Nethermind use the now obsoleted
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# chunked message frame protocol, see
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# github.com/ethereum/devp2p/commit/6504d410bc4b8dda2b43941e1cb48c804b90cf22.
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result = (-1, -1, 0)
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proc datagramSize: int =
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# For logging only
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(header[0].int shl 16) or (header[1].int shl 8) or header[1].int
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try:
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let optsLen = max(0, header[3].int - 0xc0)
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var hdrData = header[4 ..< 4 + optsLen].rlpFromBytes
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result[0] = hdrData.read(int) # capability ID
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result[1] = hdrData.read(int) # context ID
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if hdrData.isBlob:
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result[2] = hdrData.read(int) # total packet size
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trace "RLPx message first chunked header-data",
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capabilityId = result[0],
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contextId = result[1],
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totalPacketSize = result[2],
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datagramSize = datagramSize()
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#[
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elif 0 < result[1]:
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# This should be all zero according to latest specs
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trace "RLPx message chunked next header-data",
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capabilityId = result[0],
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contextId = result[1],
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datagramSize = datagramSize()
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]#
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except:
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error "RLPx message header-data options, parse error",
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capabilityId = result[0],
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contextId = result[1],
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totalPacketSize = result[2],
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datagramSize = datagramSize()
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result = (-1, -1, -1)
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proc recvMsg*(peer: Peer): Future[tuple[msgId: int, msgData: Rlp]] {.async.} =
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## This procs awaits the next complete RLPx message in the TCP stream
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@ -594,17 +547,16 @@ proc recvMsg*(peer: Peer): Future[tuple[msgId: int, msgData: Rlp]] {.async.} =
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"Snappy uncompress encountered malformed data")
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# Check embedded header-data for start of an obsoleted chunked message.
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#
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# The current RLPx requirements need all triple entries <= 0, see
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# github.com/ethereum/devp2p/blob/master/rlpx.md#framing
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let (capaId, ctxId, totalMsgSize) = msgHeader.getRlpxHeaderData
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when not allowObsoletedChunkedMessages:
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# Note that the check should come *before* the `msgId` is read. For
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# instance, if this is a malformed packet, then the `msgId` might be
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# random which in turn might try to access a `peer.dispatcher.messages[]`
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# slot with a `nil` entry.
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if 0 < capaId or 0 < ctxId or 0 < totalMsgSize:
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#
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# The current RLPx requirements need both tuuple entries be zero, see
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# github.com/ethereum/devp2p/blob/master/rlpx.md#framing
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#
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if (msgHeader[4] and 127) != 0 or # capability-id, now required to be zero
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(msgHeader[5] and 127) != 0: # context-id, now required to be zero
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await peer.disconnectAndRaise(
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BreachOfProtocol, "Rejected obsoleted chunked message header")
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@ -619,76 +571,6 @@ proc recvMsg*(peer: Peer): Future[tuple[msgId: int, msgData: Rlp]] {.async.} =
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await peer.disconnectAndRaise(BreachOfProtocol,
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"Cannot read RLPx message id")
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# Handle chunked messages
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when allowObsoletedChunkedMessages:
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# Snappy with obsolete chunked RLPx message datagrams is unsupported here
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when useSnappy:
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if peer.snappyEnabled:
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return
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# This also covers totalMessageSize <= 0
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if totalMsgSize <= msgSize:
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return
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# Loop over chunked RLPx datagram fragments
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var moreData = totalMsgSize - msgSize
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while 0 < moreData:
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# Load and parse next header
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block:
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await peer.transport.readExactly(addr headerBytes[0], 32)
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if decryptHeaderAndGetMsgSize(peer.secretsState,
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headerBytes, msgSize, msgHeader).isErr():
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trace "RLPx next chunked header-data failed",
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peer, msgId, ctxId, maxSize = moreData
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await peer.disconnectAndRaise(
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BreachOfProtocol, "Cannot decrypt next chunked RLPx header")
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# Verify that this is really the next chunk
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block:
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let (_, ctyId, totalSize) = msgHeader.getRlpxHeaderData
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if ctyId != ctxId or 0 < totalSize:
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trace "Malformed RLPx next chunked header-data",
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peer, msgId, msgSize, ctxtId = ctyId, expCtxId = ctxId, totalSize
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await peer.disconnectAndRaise(
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BreachOfProtocol, "Malformed next chunked RLPx header")
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# Append payload to `decryptedBytes` collector
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block:
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var encBytes = newSeq[byte](msgSize.encryptedLength - 32)
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await peer.transport.readExactly(addr encBytes[0], encBytes.len)
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var
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dcrBytes = newSeq[byte](msgSize.decryptedLength)
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dcrBytesCount = 0
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# TODO: This should be improved by passing a reference into
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# `decryptedBytes` where to append the data.
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if decryptBody(peer.secretsState, encBytes, msgSize,
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dcrBytes, dcrBytesCount).isErr():
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await peer.disconnectAndRaise(
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BreachOfProtocol, "Cannot decrypt next chunked RLPx frame body")
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decryptedBytes.add dcrBytes[0 ..< dcrBytesCount]
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moreData -= msgSize
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#[
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trace "RLPx next chunked datagram fragment",
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peer, msgId = result[0], ctxId, msgSize, moreData, totalMsgSize,
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dcrBytesCount, payloadSoFar = decryptedBytes.len
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]#
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# End While
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if moreData != 0:
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await peer.disconnectAndRaise(
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BreachOfProtocol, "Malformed assembly of chunked RLPx message")
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# Pass back extended message (first entry remains `msgId`)
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result[1] = decryptedBytes.rlpFromBytes
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result[1].position = rlp.position
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trace "RLPx chunked datagram payload",
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peer, msgId, ctxId, totalMsgSize, moreData, payload = decryptedBytes.len
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# End `allowObsoletedChunkedMessages`
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proc checkedRlpRead(peer: Peer, r: var Rlp, MsgType: type):
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auto {.raises: [RlpError].} =
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