292 lines
10 KiB
Nim
292 lines
10 KiB
Nim
# Nim-LibP2P
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# Copyright (c) 2022 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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# * MIT license ([LICENSE-MIT](LICENSE-MIT))
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# at your option.
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# This file may not be copied, modified, or distributed except according to
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# those terms.
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{.push raises: [Defect].}
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import times, options
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import chronos, chronicles
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import ./relay,
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./messages,
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./rconn,
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./utils,
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../../peerinfo,
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../../switch,
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../../multiaddress,
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../../stream/connection
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logScope:
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topics = "libp2p relay relay-client"
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const RelayClientMsgSize = 4096
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type
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RelayClientError* = object of LPError
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ReservationError* = object of RelayClientError
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RelayV1DialError* = object of RelayClientError
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RelayV2DialError* = object of RelayClientError
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RelayClientAddConn* = proc(conn: Connection,
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duration: uint32,
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data: uint64): Future[void] {.gcsafe, raises: [Defect].}
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RelayClient* = ref object of Relay
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onNewConnection*: RelayClientAddConn
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canHop: bool
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Rsvp* = object
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expire*: uint64 # required, Unix expiration time (UTC)
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addrs*: seq[MultiAddress] # relay address for reserving peer
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voucher*: Option[Voucher] # optional, reservation voucher
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limitDuration*: uint32 # seconds
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limitData*: uint64 # bytes
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proc sendStopError(conn: Connection, code: StatusV2) {.async.} =
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trace "send stop status", status = $code & " (" & $ord(code) & ")"
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let msg = StopMessage(msgType: StopMessageType.Status, status: some(code))
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await conn.writeLp(encode(msg).buffer)
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proc handleRelayedConnect(cl: RelayClient, conn: Connection, msg: StopMessage) {.async.} =
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if msg.peer.isNone():
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await sendStopError(conn, MalformedMessage)
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return
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let
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# TODO: check the go version to see in which way this could fail
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# it's unclear in the spec
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src = msg.peer.get()
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limitDuration = msg.limit.duration
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limitData = msg.limit.data
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msg = StopMessage(
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msgType: StopMessageType.Status,
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status: some(Ok))
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pb = encode(msg)
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trace "incoming relay connection", src
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if cl.onNewConnection == nil:
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await sendStopError(conn, StatusV2.ConnectionFailed)
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await conn.close()
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return
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await conn.writeLp(pb.buffer)
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# This sound redundant but the callback could, in theory, be set to nil during
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# conn.writeLp so it's safer to double check
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if cl.onNewConnection != nil: await cl.onNewConnection(conn, limitDuration, limitData)
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else: await conn.close()
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proc reserve*(cl: RelayClient,
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peerId: PeerId,
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addrs: seq[MultiAddress] = @[]): Future[Rsvp] {.async.} =
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let conn = await cl.switch.dial(peerId, addrs, RelayV2HopCodec)
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defer: await conn.close()
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let
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pb = encode(HopMessage(msgType: HopMessageType.Reserve))
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msg = try:
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await conn.writeLp(pb.buffer)
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HopMessage.decode(await conn.readLp(RelayClientMsgSize)).get()
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "error writing or reading reservation message", exc=exc.msg
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raise newException(ReservationError, exc.msg)
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if msg.msgType != HopMessageType.Status:
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raise newException(ReservationError, "Unexpected relay response type")
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if msg.status.get(UnexpectedMessage) != Ok:
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raise newException(ReservationError, "Reservation failed")
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if msg.reservation.isNone():
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raise newException(ReservationError, "Missing reservation information")
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let reservation = msg.reservation.get()
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if reservation.expire > int64.high().uint64 or
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now().utc > reservation.expire.int64.fromUnix.utc:
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raise newException(ReservationError, "Bad expiration date")
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result.expire = reservation.expire
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result.addrs = reservation.addrs
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if reservation.svoucher.isSome():
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let svoucher = SignedVoucher.decode(reservation.svoucher.get())
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if svoucher.isErr() or svoucher.get().data.relayPeerId != peerId:
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raise newException(ReservationError, "Invalid voucher")
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result.voucher = some(svoucher.get().data)
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result.limitDuration = msg.limit.duration
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result.limitData = msg.limit.data
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proc dialPeerV1*(
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cl: RelayClient,
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conn: Connection,
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dstPeerId: PeerId,
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dstAddrs: seq[MultiAddress]): Future[Connection] {.async.} =
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var
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msg = RelayMessage(
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msgType: some(RelayType.Hop),
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srcPeer: some(RelayPeer(peerId: cl.switch.peerInfo.peerId, addrs: cl.switch.peerInfo.addrs)),
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dstPeer: some(RelayPeer(peerId: dstPeerId, addrs: dstAddrs)))
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pb = encode(msg)
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trace "Dial peer", msgSend=msg
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try:
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await conn.writeLp(pb.buffer)
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "error writing hop request", exc=exc.msg
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raise exc
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let msgRcvFromRelayOpt = try:
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RelayMessage.decode(await conn.readLp(RelayClientMsgSize))
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "error reading stop response", exc=exc.msg
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await sendStatus(conn, StatusV1.HopCantOpenDstStream)
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raise exc
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try:
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if msgRcvFromRelayOpt.isNone:
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raise newException(RelayV1DialError, "Hop can't open destination stream")
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let msgRcvFromRelay = msgRcvFromRelayOpt.get()
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if msgRcvFromRelay.msgType.isNone or msgRcvFromRelay.msgType.get() != RelayType.Status:
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raise newException(RelayV1DialError, "Hop can't open destination stream: wrong message type")
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if msgRcvFromRelay.status.isNone or msgRcvFromRelay.status.get() != StatusV1.Success:
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raise newException(RelayV1DialError, "Hop can't open destination stream: status failed")
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except RelayV1DialError as exc:
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await sendStatus(conn, StatusV1.HopCantOpenDstStream)
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raise exc
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result = conn
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proc dialPeerV2*(
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cl: RelayClient,
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conn: RelayConnection,
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dstPeerId: PeerId,
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dstAddrs: seq[MultiAddress]): Future[Connection] {.async.} =
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let
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p = Peer(peerId: dstPeerId, addrs: dstAddrs)
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pb = encode(HopMessage(msgType: HopMessageType.Connect, peer: some(p)))
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trace "Dial peer", p
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let msgRcvFromRelay = try:
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await conn.writeLp(pb.buffer)
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HopMessage.decode(await conn.readLp(RelayClientMsgSize)).get()
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "error reading stop response", exc=exc.msg
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raise newException(RelayV2DialError, exc.msg)
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if msgRcvFromRelay.msgType != HopMessageType.Status:
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raise newException(RelayV2DialError, "Unexpected stop response")
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if msgRcvFromRelay.status.get(UnexpectedMessage) != Ok:
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trace "Relay stop failed", msg = msgRcvFromRelay.status.get()
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raise newException(RelayV2DialError, "Relay stop failure")
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conn.limitDuration = msgRcvFromRelay.limit.duration
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conn.limitData = msgRcvFromRelay.limit.data
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return conn
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proc handleStopStreamV2(cl: RelayClient, conn: Connection) {.async, gcsafe.} =
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let msgOpt = StopMessage.decode(await conn.readLp(RelayClientMsgSize))
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if msgOpt.isNone():
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await sendHopStatus(conn, MalformedMessage)
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return
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trace "client circuit relay v2 handle stream", msg = msgOpt.get()
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let msg = msgOpt.get()
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if msg.msgType == StopMessageType.Connect:
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await cl.handleRelayedConnect(conn, msg)
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else:
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trace "Unexpected client / relayv2 handshake", msgType=msg.msgType
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await sendStopError(conn, MalformedMessage)
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proc handleStop(cl: RelayClient, conn: Connection, msg: RelayMessage) {.async, gcsafe.} =
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if msg.srcPeer.isNone:
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await sendStatus(conn, StatusV1.StopSrcMultiaddrInvalid)
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return
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let src = msg.srcPeer.get()
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if msg.dstPeer.isNone:
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await sendStatus(conn, StatusV1.StopDstMultiaddrInvalid)
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return
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let dst = msg.dstPeer.get()
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if dst.peerId != cl.switch.peerInfo.peerId:
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await sendStatus(conn, StatusV1.StopDstMultiaddrInvalid)
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return
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trace "get a relay connection", src, conn
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if cl.onNewConnection == nil:
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await sendStatus(conn, StatusV1.StopRelayRefused)
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await conn.close()
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return
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await sendStatus(conn, StatusV1.Success)
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# This sound redundant but the callback could, in theory, be set to nil during
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# sendStatus(Success) so it's safer to double check
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if cl.onNewConnection != nil: await cl.onNewConnection(conn, 0, 0)
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else: await conn.close()
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proc handleStreamV1(cl: RelayClient, conn: Connection) {.async, gcsafe.} =
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let msgOpt = RelayMessage.decode(await conn.readLp(RelayClientMsgSize))
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if msgOpt.isNone:
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await sendStatus(conn, StatusV1.MalformedMessage)
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return
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trace "client circuit relay v1 handle stream", msg = msgOpt.get()
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let msg = msgOpt.get()
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case msg.msgType.get:
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of RelayType.Hop:
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if cl.canHop: await cl.handleHop(conn, msg)
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else: await sendStatus(conn, StatusV1.HopCantSpeakRelay)
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of RelayType.Stop: await cl.handleStop(conn, msg)
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of RelayType.CanHop:
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if cl.canHop: await sendStatus(conn, StatusV1.Success)
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else: await sendStatus(conn, StatusV1.HopCantSpeakRelay)
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else:
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trace "Unexpected relay handshake", msgType=msg.msgType
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await sendStatus(conn, StatusV1.MalformedMessage)
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proc new*(T: typedesc[RelayClient], canHop: bool = false,
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reservationTTL: times.Duration = DefaultReservationTTL,
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limitDuration: uint32 = DefaultLimitDuration,
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limitData: uint64 = DefaultLimitData,
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heartbeatSleepTime: uint32 = DefaultHeartbeatSleepTime,
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maxCircuit: int = MaxCircuit,
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maxCircuitPerPeer: int = MaxCircuitPerPeer,
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msgSize: int = RelayClientMsgSize,
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circuitRelayV1: bool = false): T =
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let cl = T(canHop: canHop,
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reservationTTL: reservationTTL,
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limit: Limit(duration: limitDuration, data: limitData),
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heartbeatSleepTime: heartbeatSleepTime,
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maxCircuit: maxCircuit,
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maxCircuitPerPeer: maxCircuitPerPeer,
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msgSize: msgSize,
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isCircuitRelayV1: circuitRelayV1)
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proc handleStream(conn: Connection, proto: string) {.async, gcsafe.} =
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try:
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case proto:
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of RelayV1Codec: await cl.handleStreamV1(conn)
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of RelayV2StopCodec: await cl.handleStopStreamV2(conn)
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of RelayV2HopCodec: await cl.handleHopStreamV2(conn)
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "exception in client handler", exc = exc.msg, conn
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finally:
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trace "exiting client handler", conn
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await conn.close()
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cl.handler = handleStream
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cl.codecs = if cl.canHop:
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@[RelayV1Codec, RelayV2HopCodec, RelayV2StopCodec]
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else:
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@[RelayV1Codec, RelayV2StopCodec]
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cl
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