use multiple sockets for punching multiple holes if behind a SymmetricRandom NAT
This commit is contained in:
parent
45cc3e0e34
commit
18ee5e4919
64
puncher.nim
64
puncher.nim
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@ -11,13 +11,15 @@ from sequtils import any
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type
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Attempt* = object
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## A hole punching attempt.
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srcPort*: Port
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srcPorts*: seq[Port]
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dstIp*: IpAddress
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dstPorts*: seq[Port]
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future*: Future[Port]
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future*: Future[(AsyncSocket, Port)]
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Puncher* = ref object
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sock: AsyncSocket
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socks: seq[AsyncSocket]
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srcPorts: seq[Port]
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natProps: NatProperties
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attempts: seq[Attempt]
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PunchHoleError* = object of ValueError
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@ -30,23 +32,34 @@ const Timeout = 3000
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proc `==`(a, b: Attempt): bool =
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## ``==`` for hole punching attempts.
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##
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## Two hole punching attempts are considered equal if their ``srcPort`` and
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## ``dstIp`` are equal and their ``dstPorts`` overlap.
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a.srcPort == b.srcPort and a.dstIp == b.dstIp and
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## Two hole punching attempts are considered equal if their ``dstIp`` is
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## equal, their ``srcPorts`` overlap and their ``dstPorts`` overlap.
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a.dstIp == b.dstIp and
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a.srcPorts.any(proc (p: Port): bool = p in b.srcPorts) and
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a.dstPorts.any(proc (p: Port): bool = p in b.dstPorts)
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proc initPuncher*(sock: AsyncSocket): Puncher =
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Puncher(sock: sock)
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proc initPuncher*(socks: seq[AsyncSocket], probedSrcPorts: seq[Port]): Puncher =
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assert(socks.len > 0)
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var srcPorts = newSeq[Port](socks.len)
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for i in 0 .. socks.len - 1:
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let (_, srcPort) = socks[i].getLocalAddr()
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srcPorts[i] = srcPort
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let natProps = getNatProperties(srcPorts[0], probedSrcPorts)
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Puncher(socks: socks, srcPorts: srcPorts, natProps: natProps)
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proc punch(puncher: Puncher, peerIp: IpAddress, peerPort: Port,
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peerProbedPorts: seq[Port], lowTTL: bool, msg: string):
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Future[Attempt] {.async.} =
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let punchFuture = newFuture[Port]("punch")
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let punchFuture = newFuture[(AsyncSocket, Port)]("punch")
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let natProps = getNatProperties(peerPort, peerProbedPorts)
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let predictedDstPorts = predictPortRange(natProps)
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let (_, myPort) = puncher.sock.getLocalAddr()
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result = Attempt(srcPort: myPort, dstIp: peerIp, dstPorts: predictedDstPorts,
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future: punchFuture)
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result = Attempt(srcPorts: @[puncher.srcPorts[0]], dstIp: peerIp,
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dstPorts: predictedDstPorts, future: punchFuture)
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if puncher.natProps.natType == SymmetricRandom and puncher.srcPorts.len > 1:
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# our NAT is of the evil symmetric type with random port allocation. We are
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# trying to help the other peer by punching more holes using all our
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# sockets.
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result.srcPorts.add(puncher.srcPorts[1 .. ^1])
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if puncher.attempts.contains(result):
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raise newException(PunchHoleError,
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"hole punching for given parameters already active")
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@ -56,16 +69,19 @@ proc punch(puncher: Puncher, peerIp: IpAddress, peerPort: Port,
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var peerSockLen: SockLen
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try:
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var defaultTTL: int
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for i in 0 .. result.srcPorts.len - 1:
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let sock = puncher.socks[i]
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if lowTTL:
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defaultTTL = puncher.sock.getFd.getSockOptInt(IPPROTO_IP, IP_TTL)
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puncher.sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, 2)
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defaultTTL = sock.getFd.getSockOptInt(IPPROTO_IP, IP_TTL)
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sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, 2)
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for dstPort in result.dstPorts:
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toSockAddr(result.dstIp, dstPort, peerAddr, peerSockLen)
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# TODO: replace asyncdispatch.sendTo with asyncnet.sendTo (Nim 1.4 required)
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await sendTo(puncher.sock.getFd().AsyncFD, msg.cstring, msg.len,
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await sendTo(sock.getFd.AsyncFD, msg.cstring, msg.len,
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cast[ptr SockAddr](addr peerAddr), peerSockLen)
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if lowTTL:
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puncher.sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, defaultTTL)
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sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, defaultTTL)
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except OSError as e:
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raise newException(PunchHoleError, e.msg)
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@ -77,37 +93,37 @@ proc respond*(puncher: Puncher, peerIp: IpAddress, peerPort: Port,
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peerProbedPorts: seq[Port]): Future[Attempt] =
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punch(puncher, peerIp, peerPort, peerProbedPorts, false, "ACK")
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proc finalize*(attempt: Attempt): Future[Port] {.async.} =
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proc finalize*(attempt: Attempt): Future[(AsyncSocket, Port)] {.async.} =
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await attempt.future or sleepAsync(Timeout)
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if attempt.future.finished:
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result = attempt.future.read()
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else:
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raise newException(PunchHoleError, "timeout")
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proc handleMsg*(puncher: Puncher, msg: string, peerIp: IpAddress,
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peerPort: Port) =
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proc handleMsg*(puncher: Puncher, msg: string, sock: AsyncSocket,
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peerIp: IpAddress, peerPort: Port) =
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## Handles an incoming UDP message which may complete the Futures returned by
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## ``initiate`` and ``respond``.
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if msg == "SYN":
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# We received a SYN packet. We ignore it because we expected it to be
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# filtered by our NAT.
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return
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let (_, myPort) = puncher.sock.getLocalAddr()
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let query = Attempt(srcPort: myPort, dstIp: peerIp, dstPorts: @[peerPort])
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let query = Attempt(srcPorts: puncher.srcPorts, dstIp: peerIp,
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dstPorts: @[peerPort])
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let i = puncher.attempts.find(query)
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if i != -1:
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if msg == "ACK":
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echo &"handling ACK message from {peerIp}:{peerPort}"
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else:
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echo &"handling QUIC message from {peerIp}:{peerPort}"
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puncher.attempts[i].future.complete(peerPort)
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puncher.attempts[i].future.complete((sock, peerPort))
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puncher.attempts.del(i)
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else:
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echo &"received unexpected packet from {peerIp}:{peerPort}"
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proc handleMsg*(puncher: Puncher, msg: string,
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proc handleMsg*(puncher: Puncher, msg: string, sock: AsyncSocket,
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peerAddr: SockAddr | Sockaddr_storage, peerSockLen: SockLen) =
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var peerIp: IpAddress
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var peerPort: Port
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fromSockAddr(peerAddr, peerSockLen, peerIp, peerPort)
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handleMsg(puncher, msg, peerIp, peerPort)
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handleMsg(puncher, msg, sock, peerIp, peerPort)
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101
quicp2p.nim
101
quicp2p.nim
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@ -25,6 +25,7 @@ import strutils
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from nativesockets import SockAddr, Sockaddr_storage, SockLen, getHostByName
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from posix import IOVec
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from sequtils import filter
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from strutils import parseUInt
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from openssl import
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@ -42,11 +43,12 @@ from openssl import
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type
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Connection = ref object
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conn: ptr quicly_conn_t
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sock: AsyncSocket
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certs: seq[Certificate]
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peerId: string
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expectedPeerId: string
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QuicP2PContext = ref object
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sock: AsyncSocket
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socks: seq[AsyncSocket]
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puncher: Puncher
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streamOpen: quicly_stream_open_t
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nextCid: quicly_cid_plaintext_t
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@ -66,7 +68,7 @@ const rendezvousServers: seq[tuple[hostname: string, port: Port]] = @[
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("ulrich.earth", Port(5320))
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]
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proc getRelativeTimeout(ctx: QuicP2PContext): int32 =
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proc relativeTimeout(ctx: QuicP2PContext): int32 =
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## Obtain the absolute int64 timeout from quicly and convert it to the
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## relative int32 timeout expected by poll.
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result = 0
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@ -80,7 +82,11 @@ proc getRelativeTimeout(ctx: QuicP2PContext): int32 =
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let delta = nextTimeout - now
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result = min(delta, int32.high).int32
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proc getPeerId(ctx: QuicP2PContext): string =
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proc srcPort(ctx: QuicP2PContext): Port =
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let (_, myPort) = ctx.socks[0].getLocalAddr()
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myPort
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proc peerId(ctx: QuicP2PContext): string =
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assert(ctx.tlsCtx.certificates.count == 2)
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let firstCertAddr = cast[ByteAddress](ctx.tlsCtx.certificates.list)
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let secondCertIovec = cast[ptr ptls_iovec_t](firstCertAddr + sizeof(ptls_iovec_t))
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@ -88,7 +94,7 @@ proc getPeerId(ctx: QuicP2PContext): string =
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copyMem(caCert.cstring, secondCertIovec.base, secondCertIovec.len)
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result = caCert.getPublicKey().encode(pad = false)
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proc getPeerId(conn: Connection): string =
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proc peerId(conn: Connection): string =
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assert(conn.certs.len() == 2)
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result = conn.certs[1].getPublicKey().encode(pad = false)
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@ -108,7 +114,7 @@ proc onServerReceive(stream: ptr quicly_stream_t, offset: csize_t, src: pointer,
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var msg = newString(input.len)
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copyMem(addr msg[0], input.base, input.len)
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let conn = cast[Connection](quicly_get_data(stream.conn)[])
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echo &"client {conn.getPeerId()} sends \"{msg}\""
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echo &"client {conn.peerId} sends \"{msg}\""
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if quicly_sendstate_is_open(addr stream.sendstate) != 0 and input.len > 0:
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discard quicly_streambuf_egress_write(stream, input.base, input.len)
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if quicly_recvstate_transfer_complete(addr stream.recvstate) != 0:
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@ -123,7 +129,7 @@ proc onClientReceive(stream: ptr quicly_stream_t, offset: csize_t,
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let msg = newString(input.len)
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copyMem(msg.cstring, input.base, input.len)
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let conn = cast[Connection](quicly_get_data(stream.conn)[])
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echo &"server {conn.getPeerId()} replies \"{msg}\""
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echo &"server {conn.peerId} replies \"{msg}\""
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if quicly_recvstate_transfer_complete(addr stream.recvstate) != 0:
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discard quicly_close(stream.conn, 0, "")
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quicly_streambuf_ingress_shift(stream, input.len)
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@ -208,7 +214,7 @@ proc verifyCerts(self: ptr ptls_verify_certificate_t, tls: ptr ptls_t,
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X509_STORE_free(store)
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X509_free(caCert)
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proc initContext(sock: AsyncSocket, puncher: Puncher, certChainPath: string,
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proc initContext(socks: seq[AsyncSocket], certChainPath: string,
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keyPath: string,
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streamOpenCb: typeof(quicly_stream_open_t.cb)):
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QuicP2PContext =
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@ -217,7 +223,7 @@ proc initContext(sock: AsyncSocket, puncher: Puncher, certChainPath: string,
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keyExchanges: ptls_openssl_key_exchanges,
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cipherSuites: ptls_openssl_cipher_suites)
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quicly_amend_ptls_context(addr tlsCtx)
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result = QuicP2PContext(sock: sock, puncher: puncher,
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result = QuicP2PContext(socks: socks,
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streamOpen: quicly_stream_open_t(cb: streamOpenCb),
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verifyCertsCb: ptls_verify_certificate_t(cb: verifyCerts),
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tlsCtx: tlsCtx, quiclyCtx: quicly_spec_context)
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@ -236,10 +242,11 @@ proc initContext(sock: AsyncSocket, puncher: Puncher, certChainPath: string,
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result.tlsCtx.sign_certificate = addr result.signCertCb.super
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proc addConnection(ctx: QuicP2PContext, connPtr: ptr quicly_conn_t,
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peerId: string) =
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sock: AsyncSocket, expectedPeerId: string) =
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assert(not connPtr.isNil)
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let data = quicly_get_data(connPtr)
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var conn = Connection(conn: connPtr, peerId: peerId)
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var conn = Connection(conn: connPtr, sock: sock,
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expectedPeerId: expectedPeerId)
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data[] = addr conn[]
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ctx.connections.add(conn)
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@ -267,7 +274,7 @@ proc sendPackets(ctx: QuicP2PContext) =
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for j in 0 .. dgramCount - 1:
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var sockLen = quicly_get_socklen(addr dstAddr.sa)
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# TODO: replace asyncdispatch.sendTo with asyncnet.sendTo (Nim 1.4 required)
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asyncCheck sendTo(ctx.sock.getFd().AsyncFD, dgrams[j].iov_base,
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asyncCheck sendTo(conns[i].sock.getFd().AsyncFD, dgrams[j].iov_base,
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dgrams[j].iov_len.int, addr dstAddr.sa, sockLen)
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of QUICLY_ERROR_FREE_CONNECTION:
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echo "deleting connection"
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@ -276,7 +283,8 @@ proc sendPackets(ctx: QuicP2PContext) =
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raise newException(ValueError, &"quicly_send returned {sendResult}")
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proc initiateQuicConnection(ctx: QuicP2PContext, peerId: string,
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peerIp: IpAddress, peerPort: Port) =
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sock: AsyncSocket, peerIp: IpAddress,
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peerPort: Port) =
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var conn: ptr quicly_conn_t
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var peerAddr: SockAddr_storage
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var peerSockLen: SockLen
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@ -290,9 +298,10 @@ proc initiateQuicConnection(ctx: QuicP2PContext, peerId: string,
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return
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var stream: ptr quicly_stream_t
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discard quicly_open_stream(conn, addr stream, 0)
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ctx.addConnection(conn, peerId)
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ctx.addConnection(conn, sock, peerId)
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proc handleMsg(ctx: QuicP2PContext, msg: string, peerId: string,
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puncher: Puncher, sock: AsyncSocket,
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peerAddr: ptr Sockaddr_storage, peerSockLen: SockLen) =
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var offset: csize_t = 0
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while offset < msg.len().csize_t:
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@ -304,7 +313,7 @@ proc handleMsg(ctx: QuicP2PContext, msg: string, peerId: string,
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echo "unable to decode packet"
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return
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var conn: ptr quicly_conn_t = nil
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for c in ctx.connections:
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for c in ctx.connections.filter(proc(c: Connection): bool = c.sock == sock):
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if quicly_is_destination(c.conn, nil, peerAddr, addr decoded) != 0:
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conn = c.conn
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break
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@ -313,44 +322,47 @@ proc handleMsg(ctx: QuicP2PContext, msg: string, peerId: string,
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else:
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# The puncher needs to be informed about this message because it may
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# be the peer's response to our respond call.
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ctx.puncher.handleMsg(msg, peerAddr[], peerSockLen)
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puncher.handleMsg(msg, sock, peerAddr[], peerSockLen)
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if peerId.len == 0:
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let acceptResult = quicly_accept(addr conn, addr ctx.quiclyCtx, nil,
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peerAddr, addr decoded, nil,
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addr ctx.nextCid, nil)
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if acceptResult == 0:
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ctx.addConnection(conn, peerId)
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ctx.addConnection(conn, sock, peerId)
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proc receive(ctx: QuicP2PContext, peerId: string) {.async.} =
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proc receive(ctx: QuicP2PContext, puncher: Puncher, sock: AsyncSocket,
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peerId: string) {.async.} =
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while true:
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# TODO: replace asyncdispatch.recvFromInto with asyncnet.recvFrom (Nim 1.4 required)
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var msg = newString(BufferSize)
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var peerAddr: Sockaddr_storage
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var peerAddrLen = SockLen(sizeof(peerAddr))
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let msgLen = await recvFromInto(ctx.sock.getFd().AsyncFD, msg.cstring,
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msg.len, cast[ptr SockAddr](addr peerAddr),
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let msgLen = await recvFromInto(sock.getFd().AsyncFD, msg.cstring, msg.len,
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cast[ptr SockAddr](addr peerAddr),
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addr peerAddrLen)
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msg.setLen(msgLen)
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if msg.len > 0:
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handleMsg(ctx, msg, peerId, addr peerAddr, peerAddrLen)
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handleMsg(ctx, msg, peerId, puncher, sock, addr peerAddr, peerAddrLen)
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proc handleNotification(ctx: QuicP2PContext, notification: NotifyPeer)
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{.async.} =
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let attempt = await ctx.puncher.respond(notification.srcIp, notification.srcPort,
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proc handleNotification(puncher: Puncher, notification: NotifyPeer) {.async.} =
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let attempt = await puncher.respond(notification.srcIp, notification.srcPort,
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notification.probedsrcPorts)
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discard await attempt.finalize()
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proc runApp(ctx: QuicP2PContext, srcPort: Port, peerId: string) {.async.} =
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proc runApp(ctx: QuicP2PContext, peerId: string) {.async.} =
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let serverConn = await initServerConnection(rendezvousServers[0].hostname,
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rendezvousServers[0].port,
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srcPort, rendezvousServers)
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ctx.srcPort, rendezvousServers)
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let puncher = initPuncher(ctx.socks, serverConn.probedSrcPorts)
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asyncCheck handleServerMessages(serverConn)
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asyncCheck receive(ctx, peerId)
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for sock in ctx.socks:
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asyncCheck receive(ctx, puncher, sock, peerId)
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if peerId.len == 0:
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# We are the responder
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let probedPorts = serverConn.probedSrcPorts.join(",")
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let req = &"{ctx.getPeerId()}|{serverConn.probedIp}|{srcPort}|{probedPorts}"
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let req = &"{ctx.peerId}|{serverConn.probedIp}|{ctx.srcPort}|{probedPorts}"
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discard await serverConn.sendRequest("register", req)
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while true:
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let (hasData, data) = await serverConn.peerNotifications.read()
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@ -359,7 +371,7 @@ proc runApp(ctx: QuicP2PContext, srcPort: Port, peerId: string) {.async.} =
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try:
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let msg = parseMessage[NotifyPeer](data)
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# FIXME: check if we want to receive messages from the sender
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asyncCheck handleNotification(ctx, msg)
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asyncCheck handleNotification(puncher, msg)
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except ValueError as e:
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echo e.msg
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discard
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@ -370,42 +382,49 @@ proc runApp(ctx: QuicP2PContext, srcPort: Port, peerId: string) {.async.} =
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let peerInfo = parseMessage[OkGetPeerInfo](serverResponse)
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let myProbedPorts = serverConn.probedSrcPorts.join(",")
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let peerProbedPorts = peerInfo.probedPorts.join(",")
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let req = &"{ctx.getPeerId()}|{peerId}|{serverConn.probedIp}|{srcPort}|{myProbedPorts}|{peerInfo.ip}|{peerInfo.localPort}|{peerProbedPorts}"
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let attempt = await ctx.puncher.initiate(peerInfo.ip, peerInfo.localPort,
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let req = &"{ctx.peerId}|{peerId}|{serverConn.probedIp}|{ctx.srcPort}|{myProbedPorts}|{peerInfo.ip}|{peerInfo.localPort}|{peerProbedPorts}"
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||||
let attempt = await puncher.initiate(peerInfo.ip, peerInfo.localPort,
|
||||
peerInfo.probedPorts)
|
||||
discard await serverConn.sendRequest("notify-peer", req)
|
||||
let peerPort = await attempt.finalize()
|
||||
initiateQuicConnection(ctx, peerId, peerInfo.ip, peerPort)
|
||||
let (sock, peerPort) = await attempt.finalize()
|
||||
initiateQuicConnection(ctx, peerId, sock, peerInfo.ip, peerPort)
|
||||
|
||||
proc main() =
|
||||
var ctx: QuicP2PContext
|
||||
var socks = newSeq[AsyncSocket]()
|
||||
randomize()
|
||||
for i in 0 .. 4:
|
||||
# FIXME: close socks
|
||||
let sock = newAsyncSocket(sockType = SOCK_DGRAM, protocol = IPPROTO_UDP,
|
||||
buffered = false)
|
||||
randomize()
|
||||
let srcPort = rand(Port(1024) .. Port.high)
|
||||
# FIXME: Once we start using UDP for endpoint probing (currently done in
|
||||
# initServerConnction) we either have to
|
||||
# - finish the probing before we bind the srcPort here
|
||||
# - pass the primary socket to initServerConnection
|
||||
sock.bindAddr(srcPort)
|
||||
let puncher = initPuncher(sock)
|
||||
socks.add(sock)
|
||||
|
||||
case paramCount():
|
||||
of 0:
|
||||
ctx = initContext(sock, puncher, serverCertChainPath, serverKeyPath,
|
||||
ctx = initContext(socks, serverCertChainPath, serverKeyPath,
|
||||
onServerStreamOpen)
|
||||
ctx.tlsCtx.require_client_authentication = 1
|
||||
asyncCheck runApp(ctx, srcPort, "")
|
||||
asyncCheck runApp(ctx, "")
|
||||
|
||||
of 1:
|
||||
let peerId = paramStr(1)
|
||||
ctx = initContext(sock, puncher, clientCertChainPath, clientKeyPath,
|
||||
ctx = initContext(socks, clientCertChainPath, clientKeyPath,
|
||||
onClientStreamOpen)
|
||||
asyncCheck runApp(ctx, srcPort, peerId)
|
||||
asyncCheck runApp(ctx, peerId)
|
||||
|
||||
else:
|
||||
usage()
|
||||
quit(1)
|
||||
|
||||
echo "My peer ID is ", ctx.getPeerId()
|
||||
echo "My peer ID is ", ctx.peerId
|
||||
while true:
|
||||
let nextTimeout = ctx.getRelativeTimeout()
|
||||
let nextTimeout = ctx.relativeTimeout
|
||||
poll(nextTimeout)
|
||||
ctx.sendPackets()
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue