302 lines
9.2 KiB
Nim
302 lines
9.2 KiB
Nim
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# 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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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import std/[options, sets, sequtils]
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import chronos, chronicles, stew/objects
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import ./protocol,
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../switch,
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../multiaddress,
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../multicodec,
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../peerid,
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../utils/semaphore,
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../errors
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logScope:
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topics = "libp2p autonat"
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const
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AutonatCodec* = "/libp2p/autonat/1.0.0"
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AddressLimit = 8
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type
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AutonatError* = object of LPError
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MsgType* = enum
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Dial = 0
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DialResponse = 1
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ResponseStatus* = enum
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Ok = 0
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DialError = 100
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DialRefused = 101
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BadRequest = 200
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InternalError = 300
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AutonatPeerInfo* = object
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id: Option[PeerId]
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addrs: seq[MultiAddress]
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AutonatDial* = object
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peerInfo: Option[AutonatPeerInfo]
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AutonatDialResponse* = object
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status*: ResponseStatus
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text*: Option[string]
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ma*: Option[MultiAddress]
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AutonatMsg = object
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msgType: MsgType
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dial: Option[AutonatDial]
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response: Option[AutonatDialResponse]
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proc encode*(msg: AutonatMsg): ProtoBuffer =
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result = initProtoBuffer()
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result.write(1, msg.msgType.uint)
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if msg.dial.isSome():
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var dial = initProtoBuffer()
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if msg.dial.get().peerInfo.isSome():
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var bufferPeerInfo = initProtoBuffer()
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let peerInfo = msg.dial.get().peerInfo.get()
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if peerInfo.id.isSome():
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bufferPeerInfo.write(1, peerInfo.id.get())
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for ma in peerInfo.addrs:
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bufferPeerInfo.write(2, ma.data.buffer)
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bufferPeerInfo.finish()
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dial.write(1, bufferPeerInfo.buffer)
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dial.finish()
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result.write(2, dial.buffer)
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if msg.response.isSome():
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var bufferResponse = initProtoBuffer()
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let response = msg.response.get()
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bufferResponse.write(1, response.status.uint)
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if response.text.isSome():
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bufferResponse.write(2, response.text.get())
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if response.ma.isSome():
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bufferResponse.write(3, response.ma.get())
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bufferResponse.finish()
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result.write(3, bufferResponse.buffer)
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result.finish()
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proc encode*(d: AutonatDial): ProtoBuffer =
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result = initProtoBuffer()
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result.write(1, MsgType.Dial.uint)
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var dial = initProtoBuffer()
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if d.peerInfo.isSome():
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var bufferPeerInfo = initProtoBuffer()
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let peerInfo = d.peerInfo.get()
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if peerInfo.id.isSome():
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bufferPeerInfo.write(1, peerInfo.id.get())
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for ma in peerInfo.addrs:
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bufferPeerInfo.write(2, ma.data.buffer)
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bufferPeerInfo.finish()
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dial.write(1, bufferPeerInfo.buffer)
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dial.finish()
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result.write(2, dial.buffer)
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result.finish()
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proc encode*(r: AutonatDialResponse): ProtoBuffer =
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result = initProtoBuffer()
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result.write(1, MsgType.DialResponse.uint)
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var bufferResponse = initProtoBuffer()
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bufferResponse.write(1, r.status.uint)
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if r.text.isSome():
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bufferResponse.write(2, r.text.get())
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if r.ma.isSome():
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bufferResponse.write(3, r.ma.get())
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bufferResponse.finish()
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result.write(3, bufferResponse.buffer)
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result.finish()
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proc decode(_: typedesc[AutonatMsg], buf: seq[byte]): Option[AutonatMsg] =
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var
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msgTypeOrd: uint32
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pbDial: ProtoBuffer
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pbResponse: ProtoBuffer
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msg: AutonatMsg
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let
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pb = initProtoBuffer(buf)
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r1 = pb.getField(1, msgTypeOrd)
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r2 = pb.getField(2, pbDial)
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r3 = pb.getField(3, pbResponse)
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if r1.isErr() or r2.isErr() or r3.isErr(): return none(AutonatMsg)
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if r1.get() and not checkedEnumAssign(msg.msgType, msgTypeOrd):
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return none(AutonatMsg)
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if r2.get():
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var
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pbPeerInfo: ProtoBuffer
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dial: AutonatDial
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let
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r4 = pbDial.getField(1, pbPeerInfo)
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if r4.isErr(): return none(AutonatMsg)
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var peerInfo: AutonatPeerInfo
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if r4.get():
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var pid: PeerId
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let
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r5 = pbPeerInfo.getField(1, pid)
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r6 = pbPeerInfo.getRepeatedField(2, peerInfo.addrs)
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if r5.isErr() or r6.isErr(): return none(AutonatMsg)
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if r5.get(): peerInfo.id = some(pid)
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dial.peerInfo = some(peerInfo)
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msg.dial = some(dial)
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if r3.get():
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var
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statusOrd: uint
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text: string
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ma: MultiAddress
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response: AutonatDialResponse
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let
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r4 = pbResponse.getField(1, statusOrd)
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r5 = pbResponse.getField(2, text)
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r6 = pbResponse.getField(3, ma)
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if r4.isErr() or r5.isErr() or r6.isErr() or
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(r4.get() and not checkedEnumAssign(response.status, statusOrd)):
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return none(AutonatMsg)
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if r5.get(): response.text = some(text)
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if r6.get(): response.ma = some(ma)
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msg.response = some(response)
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return some(msg)
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proc sendDial(conn: Connection, pid: PeerId, addrs: seq[MultiAddress]) {.async.} =
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let pb = AutonatDial(peerInfo: some(AutonatPeerInfo(
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id: some(pid),
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addrs: addrs
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))).encode()
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await conn.writeLp(pb.buffer)
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proc sendResponseError(conn: Connection, status: ResponseStatus, text: string = "") {.async.} =
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let pb = AutonatDialResponse(
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status: status,
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text: if text == "": none(string) else: some(text),
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ma: none(MultiAddress)
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).encode()
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await conn.writeLp(pb.buffer)
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proc sendResponseOk(conn: Connection, ma: MultiAddress) {.async.} =
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let pb = AutonatDialResponse(
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status: ResponseStatus.Ok,
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text: some("Ok"),
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ma: some(ma)
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).encode()
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await conn.writeLp(pb.buffer)
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type
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Autonat* = ref object of LPProtocol
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sem: AsyncSemaphore
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switch*: Switch
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proc dialMe*(a: Autonat, pid: PeerId, ma: MultiAddress|seq[MultiAddress]):
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Future[MultiAddress] {.async.} =
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let addrs = when ma is MultiAddress: @[ma] else: ma
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let conn = await a.switch.dial(pid, addrs, AutonatCodec)
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defer: await conn.close()
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await conn.sendDial(a.switch.peerInfo.peerId, a.switch.peerInfo.addrs)
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let msgOpt = AutonatMsg.decode(await conn.readLp(1024))
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if msgOpt.isNone() or
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msgOpt.get().msgType != DialResponse or
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msgOpt.get().response.isNone():
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raise newException(AutonatError, "Unexpected response")
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let response = msgOpt.get().response.get()
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if response.status != ResponseStatus.Ok:
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raise newException(AutonatError, "Bad status " &
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$response.status & " " &
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response.text.get(""))
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if response.ma.isNone():
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raise newException(AutonatError, "Missing address")
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return response.ma.get()
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proc tryDial(a: Autonat, conn: Connection, addrs: seq[MultiAddress]) {.async.} =
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try:
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await a.sem.acquire()
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let ma = await a.switch.dialer.tryDial(conn.peerId, addrs)
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await conn.sendResponseOk(ma)
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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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await conn.sendResponseError(DialError, exc.msg)
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finally:
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a.sem.release()
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proc handleDial(a: Autonat, conn: Connection, msg: AutonatMsg): Future[void] =
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if msg.dial.isNone() or msg.dial.get().peerInfo.isNone():
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return conn.sendResponseError(BadRequest, "Missing Peer Info")
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let peerInfo = msg.dial.get().peerInfo.get()
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if peerInfo.id.isSome() and peerInfo.id.get() != conn.peerId:
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return conn.sendResponseError(BadRequest, "PeerId mismatch")
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var isRelayed = conn.observedAddr.contains(multiCodec("p2p-circuit"))
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if isRelayed.isErr() or isRelayed.get():
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return conn.sendResponseError(DialRefused, "Refused to dial a relayed observed address")
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let hostIp = conn.observedAddr[0]
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if hostIp.isErr() or not IP.match(hostIp.get()):
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trace "wrong observed address", address=conn.observedAddr
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return conn.sendResponseError(InternalError, "Expected an IP address")
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var addrs = initHashSet[MultiAddress]()
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addrs.incl(conn.observedAddr)
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for ma in peerInfo.addrs:
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isRelayed = ma.contains(multiCodec("p2p-circuit"))
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if isRelayed.isErr() or isRelayed.get():
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continue
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let maFirst = ma[0]
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if maFirst.isErr() or not IP.match(maFirst.get()):
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continue
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try:
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addrs.incl(
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if maFirst.get() == hostIp.get():
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ma
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else:
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let maEnd = ma[1..^1]
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if maEnd.isErr(): continue
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hostIp.get() & maEnd.get()
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)
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except LPError as exc:
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continue
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if len(addrs) >= AddressLimit:
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break
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if len(addrs) == 0:
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return conn.sendResponseError(DialRefused, "No dialable address")
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return a.tryDial(conn, toSeq(addrs))
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proc new*(T: typedesc[Autonat], switch: Switch, semSize: int = 1): T =
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let autonat = T(switch: switch, sem: newAsyncSemaphore(semSize))
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autonat.init()
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autonat
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method init*(a: Autonat) =
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proc handleStream(conn: Connection, proto: string) {.async, gcsafe.} =
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try:
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let msgOpt = AutonatMsg.decode(await conn.readLp(1024))
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if msgOpt.isNone() or msgOpt.get().msgType != MsgType.Dial:
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raise newException(AutonatError, "Received malformed message")
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let msg = msgOpt.get()
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await a.handleDial(conn, msg)
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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 autonat handler", exc = exc.msg, conn
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finally:
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trace "exiting autonat handler", conn
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await conn.close()
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a.handler = handleStream
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a.codec = AutonatCodec
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