* Add separate datastructure to keep track of window
* Asynchronously block write until until new space in snd buffer
* Introduce write loop
* Properly handle write cancellation
* Proper handling of sending fin packet
* Reset remote window after configured amount of time
Closes [nimbus-eth1#767](https://github.com/status-im/nimbus-eth1/issues/767).
Crashes occur when certain invalid RLPx messages are received from a peer.
Specifically, `msgId` out of range. Because any peer can easily trigger this
crash, we'd consider it a DOS vulnerability if Nimbus-eth1 was in general use.
We noticed when syncing to Goerli, there were some rare crashes with this
exception. It turned out one peer with custom code, perhaps malfunctioning,
was sending these messages if we were unlucky enough to connect to it.
`invokeThunk` is called from `dispatchMessages` and checks the range of
`msgId`. It correctly recognise that it's out of range, raises and exception
and produces a message. Job done.
Except the code in `dispatchMessage` treats all that as a warning instead of
error, and continues to process the message. A bit lower down, `msgId` is used
again without a range check.
The trivial fix is to check array bounds before access.
--
ps. Here's the stack trace ("reraised" sections hidden):
```
WRN 2021-11-08 21:29:33.238+00:00 Error while handling RLPx message topics="rlpx" tid=2003472 file=rlpx.nim:607 peer=Node[<IP>:45456] msg=45 err="RLPx message with an invalid id 45 on a connection supporting eth,snap"
/home/jamie/Status/nimbus-eth1/nimbus/p2p/chain/chain_desc.nim(437) main
/home/jamie/Status/nimbus-eth1/nimbus/p2p/chain/chain_desc.nim(430) NimMain
/home/jamie/Status/nimbus-eth1/nimbus/nimbus.nim(258) process
/home/jamie/Status/nimbus-eth1/vendor/nim-chronos/chronos/asyncloop.nim(279) poll
/home/jamie/Status/nimbus-eth1/vendor/nim-chronos/chronos/asyncmacro2.nim(74) colonanonymous
/home/jamie/Status/nimbus-eth1/vendor/nim-eth/eth/p2p/rlpx.nim(1218) rlpxAccept
/home/jamie/Status/nimbus-eth1/vendor/nim-chronos/chronos/asyncmacro2.nim(101) postHelloSteps
/home/jamie/Status/nimbus-eth1/vendor/nim-chronos/chronos/asyncmacro2.nim(74) colonanonymous
/home/jamie/Status/nimbus-eth1/vendor/nim-eth/eth/p2p/rlpx.nim(985) postHelloSteps
/home/jamie/Status/nimbus-eth1/vendor/nim-chronos/chronos/asyncmacro2.nim(101) dispatchMessages
/home/jamie/Status/nimbus-eth1/vendor/nim-chronos/chronos/asyncmacro2.nim(77) colonanonymous
/home/jamie/Status/nimbus-eth1/vendor/nim-eth/eth/p2p/rlpx.nim(614) dispatchMessages
/home/jamie/Status/nimbus-eth1/vendor/nimbus-build-system/vendor/Nim/lib/system/chcks.nim(23) raiseIndexError2
/home/jamie/Status/nimbus-eth1/vendor/nimbus-build-system/vendor/Nim/lib/system/fatal.nim(49) sysFatal
[[reraised from: ... ]]
[[reraised from: ... ]]
[[reraised from: ... ]]
[[reraised from: ... ]]
Error: unhandled exception: index 45 not in 0 .. 40 [IndexError]
```
Signed-off-by: Jamie Lokier <jamie@shareable.org>
Separate the logging when the node is not reachable and
enrAutoUpdate is on or off to avoid confusion whether or not the
node might still become reachable.
* avoid allocation in `hash(ValidIpAddress)`
While casually browsing the profiler output, to my great surprise I
found that an allocating string conversion function (gasp!) in the hash
function for ip addresses - this PR carefully excises this evil
construct from the codebase.
* bump nim version
queryRandom was currently only async for the `enrField` version.
However the basic queryRandom is also exported and thus gets
changed so it can be properly used as async proc.
Also added exports for the modules of which objects are used in
the discovery public API.
toBytes for NodeId wasn't selected by compiler byt if it does
get selected, it will fail on the test cases due to the
countdown that is done in logDistance.
Set to toBytesBE properly now and do countup, that should make
it correct also for BE architecture.
Removed toBytes to avoid confusion and avoid this one being
selected ever. The only place toBytes for NodeId was used is in
sessions.nim makeKey func and there also the stint one
(thus native endianness) was selected in Nim 1.2.x.
Native endianness is fine there as it is only an internal
representation.
* Refactor tests and move socket to separate file
* Move sockets handling to separate class
* Abstract over underlying transport
* Fix bug with receiving duplicated SYN packet
* Fix race condition in connect
* Modify outbuffer
Each element of outbuffer keeps encoded packet ,number
of transmissions of givern packet and information if
given packet needs to be re-send.
* Add initial handling of timeouts
* Add tests for syn re-sends
Currently, `ElemType` can only be called on `List` types when they are
first assigned to a variable called `T`. The template has been adjusted
so that different variable names may be used. The template can now also
be applied to in-line computed types, e.g., `ElemType(typeof(x))`.
There was a cyrillic T in some big-endian specific code that broke the
compilation on such platforms. This replaces that T with an ASCII T to
fix the build.
* Don't fail ENR decoding when value is an RLP list
* Store RLP raw list in the ENR field pair instead
* Add ENR kList FieldKind so lists can be treated differently
Treated differently now when printing out the ENR, mentioning
that it is a raw RLP list
* Add initial handling of acks
Add implemetaion of circular buffer based on reference implementation
Add way to test number of packet in flight
Add acking of initial syn packet
* Allow for tcp/udp ports to always be configured
- Allow for an ENR to be build with tcp and udp ports also when
no IP address is provided
- In the address set-up always provide best efforttcp and udp ports
also when configuration of external ip (and/or ports) fails.
* Add initial impl of utp over udp
* Add more comments
* Add licenses and push declarations
* Add tests to nimble task
* Pr comments
Use better random generator
Raise assert error in case of buffer io exception
* Modify nodes verification
* Move nodes verification to separate module
By moving verification to separate module it can be re-used
in different contexts not only in discoveryv5.
The new sync code wants to start without waiting. We can `discard` the async
result but there is no need for a background task polling and running a timer
for no clear benefit.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
Don't treat 3 characters as special in `cmp`. `cmp` for `ProtocolInfo` was
wrong because it ignored all characters after the first 3.
In the wild we have seen protocol names longer than 3 characters. `snap`,
`hive`, `istanbul`, `bzzeth`, `bzz-stream`, `bzz-retrieve`, `dbix`, `opera`,
`pchain`, `pchain_child_0`, `sero`, `smilobft`, `spock`.
There was never a 3 character limit in the [specification]
(https://github.com/ethereum/devp2p/blob/master/rlpx.md).
It always said "short ASCII name", until recently on 2021-02-25 it was changed
to an 8 characters limit.
Also `pi.nameStr` can be removed. Nothing uses it, and it has the same actual
effect as just copying the string `pi.name`.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
For a long time this caused invalid RLP parsing of `NewBlock` messages in the
`eth` protocol.
The `rlpInline` pragma was accepted but had no effect. We could implemented
it, but it doesn't seem worth doing, with tests etc, as there's only one user
which has been fixed another way.
With `NewBlock`, whenever a peer sent us `NewBlock`, we'd get an RLP decoding
error, and disconnected the peer thinking it was the peer's error.
These messages are sent often by good peers, so whenever we connected to a
really good peer, we'd end up disconnecting within a minute due to this. This
went unnoticed for years, as we stayed connected to old peers which have no new
blocks, and we weren't looking at peer quality, disconnect reasons or real-time
blockchain updates anyway.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
1. Generalises the special cases for serialising RLP `seq[Transaction]`.
Previously it only used the special case inside `BlockBody` and `EthBlock`.
Now it uses it for all `seq[Transaction]` regardless of what objects they
are parts of, or no object at all. `openArray[Transaction]` is also
included, as this was found to be necessary to match in some places.
2. Bug fix parsing `Transaction`: Always read the first byte to get the
transaction type instead of parsing an RLP `int`. This way invalid or
adversarial input gives a correct error (i.e. invalid type code).
When it was read with `rlp.read(int)`, those inputs gave many crazy
messages (e.g. "too large to fit in memory"). In the specification it's a
byte. (Technically the input is not RLP and we shouldn't be using the RLP
parser anyway to parse standalone transaction objects).
3. Bug fix parsing `Transaction`: If a typed transaction is detected in
`seq[Transaction]`, the previous code removed the RLP (blob) wrapper, then
passed the contents to `read(Transaction)`. That meant a blob-wrapped
legacy transaction would be accepted. This is incorrect. The new code
passes the contents to the typed transaction decoder, which correctly
rejects a wrapped legacy transaction as having invalid type.
Change 1 has a large, practical effect on `eth/65` syncing with peers.
Serialisation of `eth` message types `Transactions` and `PooledTransactions`
have been broken since the introduction of typed transactions (EIP-2718), as
used in Berlin/London forks. (The special case for `seq[Transaction]` inside
`BlockBody` only fixed message type `BlockBodies`.)
Due to this, whenever a peer sent us a `Transactions` message, we had an RLP
decoding error processing it, and disconnected the peer thinking it was the
peer's error.
These messages are sent often by good peers, so whenever we connected to a
really good peer, we'd end up disconnecting from it within a few tens of
seconds due to this.
This didn't get noticed before updating to `eth/65`, because with old protocols
we tend to only connect to old peers, which may be out of date themselves and
have no typed transactions. Also, we didn't really investigate occasional
disconnects before, we assumed they're just part of P2P life.
The root cause is the RLP serialisation of individual `Transaction` is meant to
be subtly different from arrays/sequences of `Transaction` objects in network
messages. RFC-2976 covers this but it's quite subtle:
- Individual transactions are encoded and stored as either `RLP([fields..])`
for legacy transactions, or `Type || RLP([fields..])`. Both of these
encodings are byte sequences. The part after `Type` doesn't have to be
RLP in theory, but all types so far use RLP. EIP-2718 covers this.
- In arrays (sequences), transactions are encoded as either `RLP([fields..])`
for legacy transactions, or `RLP(Type || RLP([fields..]))` for all typed
transactions to date. Spot the extra `RLP(..)` blob encoding, to make it
valid RLP inside a larger RLP. EIP-2976 covers this, "Typed Transactions
over Gossip", although it's not very clear about the blob encoding.
In practice the extra `RLP(..)` applies to all arrays/sequences of transactions
that are to be RLP-encoded as a list. In principle, it should be all
aggregates (object fields etc.), but it's enough for us to enable it for all
arrays/sequences, as this is what's used in the protocol and EIP-2976.
Signed-off-by: Jamie Lokier <jamie@shareable.org>
KonradStaniec
Kim De Mey
Jamie Lokier
Jacek Sieka
Zahary Karadjov
Etan Kissling