introduce new Puncher interface; implement puncher interface for tcp-syni and tcp-nutss
parent
ff8fa732dc
commit
0750af1a13
96
punchd.nim
96
punchd.nim
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@ -1,12 +1,13 @@
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import asyncdispatch, asyncnet, os, strformat, strutils
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from nativesockets import Domain, SockType, Protocol
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from net import IpAddress, Port, `$`, `==`, parseIpAddress
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from sequtils import filter
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import asyncdispatch, asyncnet, os, strformat, strutils
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import asyncutils
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import message
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import options
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import tables
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import tcp_syni_initiator
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import tcp_syni_responder
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import tcp_nutss_initiator
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import tcp_nutss_responder
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import tcp_syni
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import tcp_nutss
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from strutils import format, join
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from nativesockets import setSockOptInt
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@ -14,8 +15,8 @@ from nativesockets import setSockOptInt
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type
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Punchd = ref object
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unixSocket: AsyncSocket
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initiators: Table[string, Initiator]
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responders: Table[string, Responder]
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punchers: Table[string, Puncher]
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attempts: seq[Attempt]
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Sigint = object of CatchableError
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@ -30,23 +31,87 @@ proc sendToClient(unixSock: AsyncSocket, msg: string,
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let unixFd = unixSock.getFd.AsyncFD
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await unixFd.asyncSendMsg(msg, cmsgs)
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proc findAttemptsByLocalAddr(punchd: Punchd, srcIp: IpAddress,
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srcPort: Port): seq[Attempt] =
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proc matchesLocalAddr(a: Attempt): bool =
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a.srcIp == srcIp and a.srcPort == srcPort
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punchd.attempts.filter(matchesLocalAddr)
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proc acceptConnections(punchd: Punchd, ip: IpAddress, port: Port,
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protocol: Protocol) {.async.} =
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var sockType: SockType
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case protocol:
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of IPPROTO_TCP:
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sockType = SOCK_STREAM
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of IPPROTO_UDP:
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sockType = SOCK_DGRAM
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else:
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assert(false, "can only accept TCP or UDP connections")
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let sock = newAsyncSocket(sockType = sockType, protocol = protocol)
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sock.bindAddr(port, $ip)
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sock.listen()
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while true:
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let acceptFuture = sock.accept()
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await acceptFuture or sleepAsync(Timeout)
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if acceptFuture.finished():
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let peer = acceptFuture.read()
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let (peerAddr, peerPort) = peer.getPeerAddr()
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let peerIp = parseIpAddress(peerAddr)
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let query = Attempt(srcIp: ip, srcPort: port, dstIp: peerIp,
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dstPorts: @[peerPort])
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let i = punchd.attempts.find(query)
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if i == -1:
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echo "Accepted connection, but no attempt found. Discarding."
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peer.close()
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continue
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else:
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let acceptFuture = punchd.attempts[i].acceptFuture.get()
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acceptFuture.complete(peer)
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let localAddrMatches = punchd.findAttemptsByLocalAddr(ip, port)
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if localAddrMatches.len() <= 1:
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break
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sock.close()
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proc addAttempt(punchd: Punchd, attempt: Attempt, puncher: Puncher) =
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let localAddrMatches = punchd.findAttemptsByLocalAddr(attempt.srcIp,
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attempt.srcPort)
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punchd.attempts.add(attempt)
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if localAddrMatches.len() == 0:
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if attempt.acceptFuture.isSome():
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asyncCheck punchd.acceptConnections(attempt.srcIp, attempt.srcPort,
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puncher.getProtocol())
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elif localAddrMatches.contains(attempt):
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raise newException(PunchHoleError,
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"hole punching for given parameters already active")
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proc removeAttempt(punchd: Punchd, attempt: Attempt) =
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punchd.attempts.del(punchd.attempts.find(attempt))
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proc handleRequest(punchd: Punchd, line: string,
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unixSock: AsyncSocket) {.async.} =
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var id: string
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var sock: AsyncSocket
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var attempt: Attempt
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try:
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let args = line.parseArgs(4)
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id = args[1]
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let puncher = punchd.punchers[args[2]]
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case args[0]:
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of "initiate":
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attempt = puncher.parseInitiateRequest(args[3])
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punchd.addAttempt(attempt, puncher)
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proc progress(extraArgs: string) {.async.} =
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let msg = &"progress|{id}|{args[2]}|{args[3]}|{extraArgs}\n"
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await sendToClient(unixSock, msg)
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sock = await punchd.initiators[args[2]].initiate(args[3], progress)
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sock = await puncher.initiate(attempt, progress)
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punchd.removeAttempt(attempt)
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of "respond":
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sock = await punchd.responders[args[2]].respond(args[3])
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attempt = puncher.parseRespondRequest(args[3])
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punchd.addAttempt(attempt, puncher)
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sock = await puncher.respond(attempt)
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punchd.removeAttempt(attempt)
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else:
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raise newException(ValueError, "invalid request")
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@ -55,6 +120,7 @@ proc handleRequest(punchd: Punchd, line: string,
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sock.close()
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except PunchHoleError as e:
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punchd.removeAttempt(attempt)
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await sendToClient(unixSock, &"error|{id}|{e.msg}\n")
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except KeyError, ValueError:
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unixSock.close
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@ -84,19 +150,15 @@ proc main() =
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{fpUserRead, fpUserWrite, fpGroupRead, fpGroupWrite,
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fpOthersRead, fpOthersWrite})
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let punchd = Punchd(unixSocket: unixSocket)
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punchd.initiators["tcp-syni"] = initTcpSyniInitiator()
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punchd.initiators["tcp-nutss"] = initTcpNutssInitiator()
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punchd.responders["tcp-syni"] = initTcpSyniResponder()
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punchd.responders["tcp-nutss"] = initTcpNutssResponder()
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punchd.punchers["tcp-syni"] = initTcpSyniPuncher()
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punchd.punchers["tcp-nutss"] = initTcpNutssPuncher()
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asyncCheck handleUsers(punchd)
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try:
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runForever()
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except Sigint:
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for i in punchd.initiators.values:
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waitFor i.cleanup()
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for r in punchd.responders.values:
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waitFor r.cleanup()
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while punchd.attempts.len() != 0:
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waitFor punchd.attempts.pop().cleanup()
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punchd.unixSocket.close()
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removeFile(PunchdSocket)
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91
puncher.nim
91
puncher.nim
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@ -1,54 +1,97 @@
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import asyncdispatch, asyncnet, strformat
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import asyncdispatch, asyncnet, strformat, options
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from nativesockets import Protocol
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from net import IpAddress, Port, `$`, `==`
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from sequtils import any
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import asyncutils
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type
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Attempt* = ref object of RootObj
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## A hole punching attempt.
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##
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## It is created by parsing the arguments of a request in either
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## ``parseInitiateRequest`` or ``parseRespondRequest`` and must not be
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## modified afterwards. By inclduing ``some(acceptFuture)``, the puncher
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## tells the caller to accept connections at the local IP address and
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## port ``srcPort`` before calling ``initiate``. The desired transport
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## protocol can be obtained by calling ``getProcotol``. The puncher expects
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## the caller to complete the future when a connections from
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## ``dstIp``:``dstPort`` has been accepted.
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srcIp*: IpAddress
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srcPort*: Port
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dstIp*: IpAddress
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dstPorts*: seq[Port]
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acceptFuture*: Option[Future[AsyncSocket]]
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Puncher* = ref object of RootObj
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attempts*: seq[Attempt]
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Initiator* = ref object of Puncher
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Responder* = ref object of Puncher
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## A hole puncher.
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PunchHoleError* = object of ValueError
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attempt: Attempt
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## An exception indicating that the contained ``attempt`` has failed.
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PunchProgressCb* = proc(extraArgs: string) {.async.}
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## A callback to allow a puncher report progress.
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##
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## When called a status message of type ``progress``, including the given
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## ``extraArgs`` has to be sent to the application.
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const Timeout* = 3000
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proc findAttempt*(puncher: Puncher, srcIp: IpAddress, srcPort: Port,
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dstIp: IpAddress, dstPorts: seq[Port]): int =
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for (index, attempt) in puncher.attempts.pairs():
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if attempt.srcIp == srcIp and attempt.srcPort == srcPort and
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attempt.dstIp == dstIp and
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attempt.dstPorts.any(proc (p: Port): bool = p in dstPorts):
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return index
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return -1
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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 ``srcIp``,
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## ``srcPort`` and ``dstIp`` are equal and their ``dstPorts`` overlap.
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a.srcIp == b.srcIp and a.srcPort == b.srcPort and a.dstIp == b.dstIp and
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a.dstPorts.any(proc (p: Port): bool = p in b.dstPorts)
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proc findAttemptsByLocalAddr*(puncher: Puncher, address: IpAddress,
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port: Port): seq[Attempt] =
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for attempt in puncher.attempts:
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if attempt.srcIp == address and attempt.srcPort == port:
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result.add(attempt)
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method cleanup*(attempt: Attempt): Future[void] {.base, async.} =
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## Cleans up when an attempt finished (either successful or not).
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##
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## Does nothing. Override for custom attempt types.
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discard
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method cleanup*(puncher: Puncher): Future[void] {.base, async.} =
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block: # workaround for https://github.com/nim-lang/Nim/issues/12530
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raise newException(CatchableError, "Method without implementation override")
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method getProtocol*(puncher: Puncher): Protocol {.base.} =
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## Returns the transport protocol the puncher employs.
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raise newException(CatchableError, "Method without implementation override")
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method initiate*(puncher: Initiator, args: string, progress: PunchProgressCb):
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method parseInitiateRequest*(puncher: Puncher, args: string): Attempt {.base.} =
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## Creates a new hole punching attempt by parsing arguments of an ``initiate``
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## request.
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##
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## ``args`` has to be the arguments after the ``TECHNIQUE`` field, i.e.
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## ``IP_FROM|PORTS_FROM|IP_TO|PORTS_TO``. My throw a ``ValueError`` if
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## ``args`` is invalid.
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raise newException(CatchableError, "Method without implementation override")
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method parseRespondRequest*(puncher: Puncher, args: string): Attempt {.base.} =
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## Creates a new hole punching attempt by parsing arguments of a ``respond``
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## request.
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##
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## ``args`` has to be the arguments after the ``TECHNIQUE`` field, i.e.
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## ``IP_FROM|PORTS_FROM|IP_TO|PORTS_TO|EXTRA_ARGS``. May throw a
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## ``ValueError`` if ``args`` is invalid.
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raise newException(CatchableError, "Method without implementation override")
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method initiate*(puncher: Puncher, attempt: Attempt, progress: PunchProgressCb):
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Future[AsyncSocket] {.base, async.} =
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## Initiate a hole punching attempt.
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##
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## ``attempt`` has to be obtained by calling ``parseInitiateRequest``.
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## ``progress`` will be called when the attempt has been initiated and a
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## status message of type ``progress`` has to be sent to the application. The
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## returned future contains a connected socket and will fail with a
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## ``PunchHoleError`` if the hole punching fails.
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block: # workaround for https://github.com/nim-lang/Nim/issues/12530
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raise newException(CatchableError, "Method without implementation override")
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method respond*(puncher: Responder, args: string):
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method respond*(puncher: Puncher, attempt: Attempt):
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Future[AsyncSocket] {.base, async.} =
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## Respond to a hole punching attempt initiated by another peer.
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##
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## ``attempt has to be obtained by calling ``parseRespondRequest``. The
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## returned future contains a connected socket and will fail with as
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## ``PunchHoleError`` if the hole punching fails.
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block: # workaround for https://github.com/nim-lang/Nim/issues/12530
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raise newException(CatchableError, "Method without implementation override")
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@ -0,0 +1,106 @@
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from nativesockets import Protocol
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from net import IpAddress, Port, `$`, `==`
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from random import randomize, rand
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import asyncdispatch, asyncnet, strformat
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import ip_packet
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import message
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import options
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import port_prediction
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import puncher
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import raw_socket
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import utils
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export puncher
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type
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TcpNutssPuncher* = ref object of Puncher
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InitiateRequest = object
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srcIp: IpAddress
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srcPorts: seq[Port]
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dstIp: IpAddress
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dstPorts: seq[Port]
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RespondRequest = object
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dstIp: IpAddress
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dstPorts: seq[Port]
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srcIp: IpAddress
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srcPorts: seq[Port]
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extraArgs: string
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proc injectSynPackets(attempt: Attempt) {.async.} =
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let injectFd = setupTcpInjectingSocket()
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for dstPort in attempt.dstPorts:
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let synOut = IpPacket(protocol: tcp, ipAddrSrc: attempt.srcIp,
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ipAddrDst: attempt.dstIp, ipTTL: 2,
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tcpPortSrc: attempt.srcPort, tcpPortDst: dstPort,
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tcpSeqNumber: rand(uint32), tcpAckNumber: 0,
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tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
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echo &"[{synOut.ipAddrSrc}:{synOut.tcpPortSrc} -> {synOut.ipAddrDst}:{synOut.tcpPortDst}, SEQ {synOut.tcpSeqNumber}] injecting outgoing SYN"
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await injectFd.injectTcpPacket(synOut)
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proc connect(srcIp: IpAddress, srcPort: Port, dstIp: IpAddress, dstPort: Port,
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future: Future[AsyncSocket]) {.async.} =
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let sock = newAsyncSocket()
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sock.setSockOpt(OptReuseAddr, true)
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echo &"connect {srcIp}:{srcPort} -> {dstIp}:{dstPort}"
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sock.bindAddr(srcPort, $srcIp)
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try:
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await sock.connect($dstIp, dstPort)
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future.complete(sock)
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except OSError as e:
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echo &"connection {srcIP}:{srcPort.int} -> {dstIp}:{dstPort.int} failed: ", e.msg
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sock.close()
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proc initTcpNutssPuncher*(): TcpNutssPuncher =
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randomize()
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TcpNutssPuncher()
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method getProtocol*(puncher: TcpNutssPuncher): Protocol =
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IPPROTO_TCP
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method parseInitiateRequest*(puncher: TcpNutssPuncher, args: string): Attempt =
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let parsed = parseMessage[InitiateRequest](args)
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let localIp = getPrimaryIPAddr(parsed.dstIp)
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let predictedDstPorts = predictPortRange(parsed.dstPorts)
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let acceptFuture = newFuture[AsyncSocket]("parseInitiateRequest")
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Attempt(srcIp: localIp, srcPort: parsed.srcPorts[0], dstIp: parsed.dstIp,
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dstPorts: predictedDstPorts, acceptFuture: some(acceptFuture))
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method parseRespondRequest*(puncher: TcpNutssPuncher, args: string): Attempt =
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let parsed = parseMessage[RespondRequest](args)
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let localIp = getPrimaryIPAddr(parsed.dstIp)
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let predictedDstPorts = predictPortRange(parsed.dstPorts)
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Attempt(srcIp: localIp, srcPort: parsed.srcPorts[0], dstIp: parsed.dstIp,
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dstPorts: predictedDstPorts, acceptFuture: none(Future[AsyncSocket]))
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method initiate*(puncher: TcpNutssPuncher, attempt: Attempt,
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progress: PunchProgressCb): Future[AsyncSocket] {.async.} =
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assert(attempt.acceptFuture.isSome(), "expected attempt with acceptFuture")
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try:
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let acceptFuture = attempt.acceptFuture.get()
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await injectSynPackets(attempt)
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await progress("")
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await acceptFuture or sleepAsync(Timeout)
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if acceptFuture.finished():
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result = acceptFuture.read()
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else:
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raise newException(PunchHoleError, "timeout")
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except OSError as e:
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raise newException(PunchHoleError, e.msg)
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method respond*(puncher: TcpNutssPuncher, attempt: Attempt):
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Future[AsyncSocket] {.async.} =
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assert(attempt.acceptFuture.isNone(), "expected attempt without acceptFuture")
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try:
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let connectFuture = newFuture[AsyncSocket]("respond")
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for dstPort in attempt.dstPorts:
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asyncCheck connect(attempt.srcIp, attempt.srcPort, attempt.dstIp, dstPort,
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connectFuture)
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await connectFuture or sleepAsync(Timeout)
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if connectFuture.finished():
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result = connectFuture.read()
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else:
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raise newException(PunchHoleError, "timeout")
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except OSError as e:
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raise newException(PunchHoleError, e.msg)
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@ -1,97 +0,0 @@
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import asyncdispatch, asyncnet, strformat
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from net import IpAddress, Port, `$`, `==`, parseIpAddress
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from random import randomize, rand
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from sequtils import any
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import ip_packet
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import message
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import port_prediction
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import puncher
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import raw_socket
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import utils
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export Puncher, Initiator, PunchProgressCb, PunchHoleError, cleanup, initiate
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type
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TNIAttempt = ref object of Attempt
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future: Future[AsyncSocket]
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TcpNutssInitiator* = ref object of Initiator
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Request = object
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srcIp: IpAddress
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srcPorts: seq[Port]
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dstIp: IpAddress
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dstPorts: seq[Port]
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method cleanup*(puncher: TcpNutssInitiator) {.async.} =
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discard
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proc initTcpNutssInitiator*(): TcpNutssInitiator =
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randomize()
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TcpNutssInitiator()
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proc injectSynPackets(attempt: TNIAttempt) {.async.} =
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let injectFd = setupTcpInjectingSocket()
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for dstPort in attempt.dstPorts:
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let synOut = IpPacket(protocol: tcp, ipAddrSrc: attempt.srcIp,
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ipAddrDst: attempt.dstIp, ipTTL: 2,
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tcpPortSrc: attempt.srcPort, tcpPortDst: dstPort,
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tcpSeqNumber: rand(uint32), tcpAckNumber: 0,
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tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
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echo &"[{synOut.ipAddrSrc}:{synOut.tcpPortSrc} -> {synOut.ipAddrDst}:{synOut.tcpPortDst}, SEQ {synOut.tcpSeqNumber}] injecting outgoing SYN"
|
||||
await injectFd.injectTcpPacket(synOut)
|
||||
|
||||
proc accept(puncher: TcpNutssInitiator, ip: IpAddress, port: Port) {.async.} =
|
||||
let sock = newAsyncSocket()
|
||||
#sock.setSockOpt(OptReuseAddr, true)
|
||||
sock.bindAddr(port, $ip)
|
||||
sock.listen()
|
||||
while true:
|
||||
let acceptFuture = sock.accept()
|
||||
await acceptFuture or sleepAsync(Timeout)
|
||||
if acceptFuture.finished():
|
||||
let peer = acceptFuture.read()
|
||||
let (peerAddr, peerPort) = peer.getPeerAddr()
|
||||
let peerIp = parseIpAddress(peerAddr)
|
||||
let i = puncher.findAttempt(ip, port, peerIp, @[peerPort])
|
||||
if i == -1:
|
||||
echo "Accepted connection, but no attempt found. Discarding."
|
||||
peer.close()
|
||||
continue
|
||||
else:
|
||||
let attempt = TNIAttempt(puncher.attempts[i])
|
||||
attempt.future.complete(peer)
|
||||
let attempts = puncher.findAttemptsByLocalAddr(ip, port)
|
||||
if attempts.len() <= 1:
|
||||
break
|
||||
sock.close()
|
||||
|
||||
method initiate*(puncher: TcpNutssInitiator, args: string,
|
||||
progressCb: PunchProgressCb): Future[AsyncSocket] {.async.} =
|
||||
let req = parseMessage[Request](args)
|
||||
let localIp = getPrimaryIPAddr(req.dstIp)
|
||||
let existingAttempts = puncher.findAttemptsByLocalAddr(localIp, req.srcPorts[0])
|
||||
if existingAttempts.len() == 0:
|
||||
echo &"initiating connection to {req.dstIp}:{req.dstPorts[0].int}"
|
||||
asyncCheck puncher.accept(localIp, req.srcPorts[0])
|
||||
else:
|
||||
for a in existingAttempts:
|
||||
if a.dstIp == req.dstIp and
|
||||
a.dstPorts.any(proc (p: Port): bool = p in req.dstPorts):
|
||||
raise newException(PunchHoleError, "hole punching for given parameters already active")
|
||||
try:
|
||||
let attempt = TNIAttempt(srcIp: localIp, srcPort: req.srcPorts[0],
|
||||
dstIp: req.dstIp,
|
||||
dstPorts: predictPortRange(req.dstPorts),
|
||||
future: newFuture[AsyncSocket]("initiate"))
|
||||
puncher.attempts.add(attempt)
|
||||
await attempt.injectSynPackets()
|
||||
await progressCb("")
|
||||
await attempt.future or sleepAsync(Timeout)
|
||||
puncher.attempts.del(puncher.attempts.find(attempt))
|
||||
if attempt.future.finished():
|
||||
result = attempt.future.read()
|
||||
else:
|
||||
raise newException(PunchHoleError, "timeout")
|
||||
except OSError as e:
|
||||
raise newException(PunchHoleError, e.msg)
|
||||
|
|
@ -1,54 +0,0 @@
|
|||
import asyncdispatch, asyncnet, strformat
|
||||
from net import IpAddress, Port, `$`, `==`
|
||||
import message
|
||||
import port_prediction
|
||||
import puncher
|
||||
import utils
|
||||
|
||||
export Puncher, Responder, PunchHoleError, cleanup, respond
|
||||
|
||||
type
|
||||
TcpNutssResponder* = ref object of Responder
|
||||
|
||||
Request = object
|
||||
dstIp: IpAddress
|
||||
dstPorts: seq[Port]
|
||||
srcIp: IpAddress
|
||||
srcPorts: seq[Port]
|
||||
extraData: string
|
||||
|
||||
method cleanup*(puncher: TcpNutssResponder) {.async.} =
|
||||
discard
|
||||
|
||||
proc initTcpNutssResponder*(): TcpNutssResponder =
|
||||
TcpNutssResponder()
|
||||
|
||||
proc connect(srcIp: IpAddress, srcPort: Port, dstIp: IpAddress, dstPort: Port,
|
||||
future: Future[AsyncSocket]) {.async.} =
|
||||
let sock = newAsyncSocket()
|
||||
sock.setSockOpt(OptReuseAddr, true)
|
||||
echo &"connect {srcIp}:{srcPort} -> {dstIp}:{dstPort}"
|
||||
sock.bindAddr(srcPort, $srcIp)
|
||||
try:
|
||||
await sock.connect($dstIp, dstPort)
|
||||
future.complete(sock)
|
||||
except OSError as e:
|
||||
echo &"connection {srcIP}:{srcPort.int} -> {dstIp}:{dstPort.int} failed: ", e.msg
|
||||
sock.close()
|
||||
|
||||
method respond*(puncher: TcpNutssResponder, args: string): Future[AsyncSocket] {.async.} =
|
||||
let req = parseMessage[Request](args)
|
||||
let localIp = getPrimaryIPAddr(req.dstIp)
|
||||
try:
|
||||
let connectFuture = newFuture[AsyncSocket]("respond")
|
||||
let portRange = predictPortRange(req.dstPorts)
|
||||
for dstPort in portRange:
|
||||
asyncCheck connect(localIp, req.srcPorts[0], req.dstIp, req.dstPorts[0],
|
||||
connectFuture)
|
||||
await connectFuture or sleepAsync(Timeout)
|
||||
if connectFuture.finished():
|
||||
result = connectFuture.read()
|
||||
else:
|
||||
raise newException(PunchHoleError, "timeout")
|
||||
except OSError as e:
|
||||
raise newException(PunchHoleError, e.msg)
|
||||
|
|
@ -0,0 +1,190 @@
|
|||
from nativesockets import Protocol, setSockOptInt
|
||||
from net import IpAddress, Port, `$`, `==`
|
||||
from random import randomize, rand
|
||||
from strutils import join
|
||||
import asyncdispatch, asyncnet, strformat
|
||||
import ip_packet
|
||||
import message
|
||||
import network_interface
|
||||
import options
|
||||
import port_prediction
|
||||
import puncher
|
||||
import raw_socket
|
||||
import utils
|
||||
|
||||
export puncher
|
||||
|
||||
type
|
||||
TcpSyniPuncher* = ref object of Puncher
|
||||
|
||||
InitiateRequest = object
|
||||
srcIp: IpAddress
|
||||
srcPorts: seq[Port]
|
||||
dstIp: IpAddress
|
||||
dstPorts: seq[Port]
|
||||
|
||||
RespondRequest = object
|
||||
dstIp: IpAddress
|
||||
dstPorts: seq[Port]
|
||||
srcIp: IpAddress
|
||||
srcPorts: seq[Port]
|
||||
seqNums: seq[uint32]
|
||||
|
||||
TcpSyniInitiateAttempt = ref object of Attempt
|
||||
|
||||
TcpSyniRespondAttempt = ref object of Attempt
|
||||
seqNums: seq[uint32]
|
||||
|
||||
var IPPROTO_IP {.importc: "IPPROTO_IP", header: "<netinet/in.h>".}: cint
|
||||
var IP_TTL {.importc: "IP_TTL", header: "<netinet/in.h>".}: cint
|
||||
|
||||
proc captureSeqNumbers(attempt: Attempt, cb: PunchProgressCb) {.async.} =
|
||||
# FIXME: timeout?
|
||||
let iface = getNetworkInterface(attempt.srcIp)
|
||||
let captureFd = setupEthernetCapturingSocket(iface)
|
||||
var seqNums = newSeq[uint32]()
|
||||
while seqNums.len < attempt.dstPorts.len:
|
||||
let packet = await captureFd.recv(4000)
|
||||
if packet == "":
|
||||
break
|
||||
let parsed = parseEthernetPacket(packet)
|
||||
if parsed.protocol == tcp and
|
||||
parsed.ipAddrSrc == attempt.srcIp and
|
||||
parsed.tcpPortSrc.int == attempt.srcPort.int and
|
||||
parsed.ipAddrDst == attempt.dstIp and
|
||||
parsed.tcpFlags == {SYN}:
|
||||
for port in attempt.dstPorts:
|
||||
if parsed.tcpPortDst.int == port.int:
|
||||
seqNums.add(parsed.tcpSeqNumber)
|
||||
break
|
||||
closeSocket(captureFd)
|
||||
await cb(seqNums.join(","))
|
||||
|
||||
proc captureAndResendAck(attempt: Attempt) {.async.} =
|
||||
let iface = getNetworkInterface(attempt.srcIp)
|
||||
let captureFd = setupEthernetCapturingSocket(iface)
|
||||
let injectFd = setupTcpInjectingSocket()
|
||||
block loops:
|
||||
while true:
|
||||
let packet = await captureFd.recv(4000)
|
||||
if packet == "":
|
||||
break
|
||||
var parsed = parseEthernetPacket(packet)
|
||||
if parsed.protocol == tcp and
|
||||
parsed.ipAddrSrc == attempt.srcIp and
|
||||
parsed.tcpPortSrc.int == attempt.srcPort.int and
|
||||
parsed.ipAddrDst == attempt.dstIp and
|
||||
parsed.tcpFlags == {ACK}:
|
||||
for port in attempt.dstPorts:
|
||||
if parsed.tcpPortDst.int == port.int:
|
||||
parsed.ipTTL = 64
|
||||
echo &"[{parsed.ipAddrSrc}:{parsed.tcpPortSrc.int} -> {parsed.ipAddrDst}:{parsed.tcpPortDst}, SEQ {parsed.tcpSeqNumber}] resending ACK with TTL {parsed.ipTTL}"
|
||||
await injectFd.injectTcpPacket(parsed)
|
||||
break loops
|
||||
closeSocket(captureFd)
|
||||
closeSocket(injectFd)
|
||||
|
||||
proc connect(srcIp: IpAddress, srcPort: Port, dstIp: IpAddress, dstPort: Port,
|
||||
future: Future[AsyncSocket]) {.async.} =
|
||||
let sock = newAsyncSocket()
|
||||
sock.setSockOpt(OptReuseAddr, true)
|
||||
sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, 2)
|
||||
echo &"connect {srcIp}:{srcPort} -> {dstIp}:{dstPort}"
|
||||
sock.bindAddr(srcPort, $srcIp)
|
||||
try:
|
||||
await sock.connect($dstIp, dstPort)
|
||||
sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, 64)
|
||||
future.complete(sock)
|
||||
except OSError as e:
|
||||
echo &"connection {srcIP}:{srcPort.int} -> {dstIp}:{dstPort.int} failed: ", e.msg
|
||||
sock.close()
|
||||
|
||||
proc injectSynPackets(attempt: TcpSyniRespondAttempt) {.async.} =
|
||||
let injectFd = setupTcpInjectingSocket()
|
||||
for dstPort in attempt.dstPorts:
|
||||
let synOut = IpPacket(protocol: tcp, ipAddrSrc: attempt.srcIp,
|
||||
ipAddrDst: attempt.dstIp, ipTTL: 2,
|
||||
tcpPortSrc: attempt.srcPort, tcpPortDst: dstPort,
|
||||
tcpSeqNumber: rand(uint32), tcpAckNumber: 0,
|
||||
tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
|
||||
echo &"[{synOut.ipAddrSrc}:{synOut.tcpPortSrc} -> {synOut.ipAddrDst}:{synOut.tcpPortDst}, SEQ {synOut.tcpSeqNumber}] injecting outgoing SYN"
|
||||
await injectFd.injectTcpPacket(synOut)
|
||||
for seqNum in attempt.seqNums:
|
||||
let synIn = IpPacket(protocol: tcp, ipAddrSrc: attempt.dstIp,
|
||||
ipAddrDst: attempt.srcIp, ipTTL: 64,
|
||||
tcpPortSrc: dstPort,
|
||||
tcpPortDst: attempt.srcPort,
|
||||
tcpSeqNumber: seqNum, tcpAckNumber: 0,
|
||||
tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
|
||||
echo &"[{synIn.ipAddrSrc}:{synIn.tcpPortSrc} -> {synIn.ipAddrDst}:{synIn.tcpPortDst}, SEQ {synIn.tcpSeqNumber}] injecting incoming SYN"
|
||||
await injectFd.injectTcpPacket(synIn)
|
||||
closeSocket(injectFd)
|
||||
|
||||
proc initTcpSyniPuncher*(): TcpSyniPuncher =
|
||||
randomize()
|
||||
TcpSyniPuncher()
|
||||
|
||||
method cleanup*(attempt: TcpSyniInitiateAttempt) {.async.} =
|
||||
await deleteFirewallRules(attempt)
|
||||
|
||||
method cleanup*(attempt: TcpSyniRespondAttempt) {.async.} =
|
||||
await deleteFirewallRules(attempt)
|
||||
|
||||
method getProtocol*(puncher: TcpSyniPuncher): Protocol =
|
||||
IPPROTO_TCP
|
||||
|
||||
method parseInitiateRequest*(puncher: TcpSyniPuncher, args: string): Attempt =
|
||||
let parsed = parseMessage[InitiateRequest](args)
|
||||
let localIp = getPrimaryIPAddr(parsed.dstIp)
|
||||
let predictedDstPorts = predictPortRange(parsed.dstPorts)
|
||||
TcpSyniInitiateAttempt(srcIp: localIp, srcPort: parsed.srcPorts[0],
|
||||
dstIp: parsed.dstIp, dstPorts: predictedDstPorts,
|
||||
acceptFuture: none(Future[AsyncSocket]))
|
||||
|
||||
method parseRespondRequest*(puncher: TcpSyniPuncher, args: string): Attempt =
|
||||
let parsed = parseMessage[RespondRequest](args)
|
||||
let localIp = getPrimaryIPAddr(parsed.dstIp)
|
||||
let predictedDstPorts = predictPortRange(parsed.dstPorts)
|
||||
let acceptFuture = newFuture[AsyncSocket]("parseRespondRequest")
|
||||
TcpSyniRespondAttempt(srcIp: localIp, srcPort: parsed.srcPorts[0],
|
||||
dstIp: parsed.dstIp, dstPorts: predictedDstPorts,
|
||||
acceptFuture: some(acceptFuture),
|
||||
seqNums: parsed.seqNums)
|
||||
|
||||
method initiate*(puncher: TcpSyniPuncher, attempt: Attempt,
|
||||
progress: PunchProgressCb): Future[AsyncSocket] {.async.} =
|
||||
assert(attempt of TcpSyniInitiateAttempt, "unexpected attempt type")
|
||||
assert(attempt.acceptFuture.isNone(), "expected attempt without acceptFuture")
|
||||
await addFirewallRules(attempt)
|
||||
asyncCheck captureSeqNumbers(attempt, progress)
|
||||
asyncCheck captureAndResendAck(attempt)
|
||||
try:
|
||||
let connectFuture = newFuture[AsyncSocket]("connect")
|
||||
for dstPort in attempt.dstPorts:
|
||||
asyncCheck connect(attempt.srcIp, attempt.srcPort, attempt.dstIp,
|
||||
dstPort, connectFuture)
|
||||
await connectFuture or sleepAsync(Timeout)
|
||||
await deleteFirewallRules(attempt)
|
||||
if connectFuture.finished():
|
||||
result = connectFuture.read()
|
||||
else:
|
||||
raise newException(PunchHoleError, "timeout")
|
||||
except OSError as e:
|
||||
raise newException(PunchHoleError, e.msg)
|
||||
|
||||
method respond*(puncher: TcpSyniPuncher, attempt: Attempt):
|
||||
Future[AsyncSocket] {.async.} =
|
||||
assert(attempt of TcpSyniRespondAttempt, "unexpected attempt type")
|
||||
assert(attempt.acceptFuture.isSome(), "expected attempt with acceptFuture")
|
||||
try:
|
||||
let acceptFuture = attempt.acceptFuture.get()
|
||||
await addFirewallRules(attempt) # FIXME: needed?
|
||||
await injectSynPackets(TcpSyniRespondAttempt(attempt))
|
||||
await acceptFuture or sleepAsync(Timeout)
|
||||
await deleteFirewallRules(attempt) # FIXME: needed?
|
||||
if acceptFuture.finished():
|
||||
result = acceptFuture.read()
|
||||
else:
|
||||
raise newException(PunchHoleError, "timeout")
|
||||
except OSError as e:
|
||||
raise newException(PunchHoleError, e.msg)
|
||||
|
|
@ -1,120 +0,0 @@
|
|||
import asyncdispatch, asyncnet, strformat
|
||||
from net import IpAddress, Port, `$`, `==`
|
||||
from nativesockets import setSockOptInt
|
||||
from strutils import join
|
||||
import ip_packet
|
||||
import message
|
||||
import network_interface
|
||||
import port_prediction
|
||||
import puncher
|
||||
import raw_socket
|
||||
import utils
|
||||
|
||||
export Puncher, Initiator, PunchProgressCb, PunchHoleError, cleanup, initiate
|
||||
|
||||
type
|
||||
TcpSyniInitiator* = ref object of Initiator
|
||||
|
||||
Request = object
|
||||
srcIp: IpAddress
|
||||
srcPorts: seq[Port]
|
||||
dstIp: IpAddress
|
||||
dstPorts: seq[Port]
|
||||
|
||||
var IPPROTO_IP {.importc: "IPPROTO_IP", header: "<netinet/in.h>".}: cint
|
||||
var IP_TTL {.importc: "IP_TTL", header: "<netinet/in.h>".}: cint
|
||||
|
||||
method cleanup*(puncher: TcpSyniInitiator): Future[void] {.async.} =
|
||||
while puncher.attempts.len() != 0:
|
||||
await puncher.attempts.pop().deleteFirewallRules()
|
||||
|
||||
proc initTcpSyniInitiator*(): TcpSyniInitiator =
|
||||
TcpSyniInitiator()
|
||||
|
||||
proc captureSeqNumbers(attempt: Attempt, cb: PunchProgressCb) {.async.} =
|
||||
# FIXME: timeout?
|
||||
let iface = getNetworkInterface(attempt.srcIp)
|
||||
let captureFd = setupEthernetCapturingSocket(iface)
|
||||
var seqNums = newSeq[uint32]()
|
||||
while seqNums.len < attempt.dstPorts.len:
|
||||
let packet = await captureFd.recv(4000)
|
||||
if packet == "":
|
||||
break
|
||||
let parsed = parseEthernetPacket(packet)
|
||||
if parsed.protocol == tcp and
|
||||
parsed.ipAddrSrc == attempt.srcIp and
|
||||
parsed.tcpPortSrc.int == attempt.srcPort.int and
|
||||
parsed.ipAddrDst == attempt.dstIp and
|
||||
parsed.tcpFlags == {SYN}:
|
||||
for port in attempt.dstPorts:
|
||||
if parsed.tcpPortDst.int == port.int:
|
||||
seqNums.add(parsed.tcpSeqNumber)
|
||||
break
|
||||
closeSocket(captureFd)
|
||||
await cb(seqNums.join(","))
|
||||
|
||||
proc captureAndResendAck(attempt: Attempt) {.async.} =
|
||||
let iface = getNetworkInterface(attempt.srcIp)
|
||||
let captureFd = setupEthernetCapturingSocket(iface)
|
||||
let injectFd = setupTcpInjectingSocket()
|
||||
block loops:
|
||||
while true:
|
||||
let packet = await captureFd.recv(4000)
|
||||
if packet == "":
|
||||
break
|
||||
var parsed = parseEthernetPacket(packet)
|
||||
if parsed.protocol == tcp and
|
||||
parsed.ipAddrSrc == attempt.srcIp and
|
||||
parsed.tcpPortSrc.int == attempt.srcPort.int and
|
||||
parsed.ipAddrDst == attempt.dstIp and
|
||||
parsed.tcpFlags == {ACK}:
|
||||
for port in attempt.dstPorts:
|
||||
if parsed.tcpPortDst.int == port.int:
|
||||
parsed.ipTTL = 64
|
||||
echo &"[{parsed.ipAddrSrc}:{parsed.tcpPortSrc.int} -> {parsed.ipAddrDst}:{parsed.tcpPortDst}, SEQ {parsed.tcpSeqNumber}] resending ACK with TTL {parsed.ipTTL}"
|
||||
await injectFd.injectTcpPacket(parsed)
|
||||
break loops
|
||||
closeSocket(captureFd)
|
||||
closeSocket(injectFd)
|
||||
|
||||
proc connect(srcIp: IpAddress, srcPort: Port, dstIp: IpAddress, dstPort: Port,
|
||||
future: Future[AsyncSocket]) {.async.} =
|
||||
let sock = newAsyncSocket()
|
||||
sock.setSockOpt(OptReuseAddr, true)
|
||||
sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, 2)
|
||||
echo &"connect {srcIp}:{srcPort} -> {dstIp}:{dstPort}"
|
||||
sock.bindAddr(srcPort, $srcIp)
|
||||
try:
|
||||
await sock.connect($dstIp, dstPort)
|
||||
sock.getFd.setSockOptInt(IPPROTO_IP, IP_TTL, 64)
|
||||
future.complete(sock)
|
||||
except OSError as e:
|
||||
echo &"connection {srcIP}:{srcPort.int} -> {dstIp}:{dstPort.int} failed: ", e.msg
|
||||
sock.close()
|
||||
|
||||
method initiate*(puncher: TcpSyniInitiator, args: string,
|
||||
progressCb: PunchProgressCb): Future[AsyncSocket] {.async.} =
|
||||
let req = parseMessage[Request](args)
|
||||
let localIp = getPrimaryIPAddr(req.dstIp)
|
||||
if puncher.findAttempt(localIp, req.srcPorts[0], req.dstIp, req.dstPorts) != -1:
|
||||
raise newException(PunchHoleError, "hole punching for given parameters already active")
|
||||
let attempt = Attempt(srcIp: localIp, srcPort: req.srcPorts[0], dstIp: req.dstIp,
|
||||
dstPorts: predictPortRange(req.dstPorts))
|
||||
puncher.attempts.add(attempt)
|
||||
await attempt.addFirewallRules()
|
||||
asyncCheck attempt.captureSeqNumbers(progressCb)
|
||||
asyncCheck attempt.captureAndResendAck()
|
||||
try:
|
||||
let connectFuture = newFuture[AsyncSocket]("connect")
|
||||
for dstPort in attempt.dstPorts:
|
||||
asyncCheck connect(attempt.srcIp, attempt.srcPort, attempt.dstIp,
|
||||
dstPort, connectFuture)
|
||||
await connectFuture or sleepAsync(Timeout)
|
||||
await attempt.deleteFirewallRules()
|
||||
puncher.attempts.del(puncher.attempts.find(attempt))
|
||||
if connectFuture.finished():
|
||||
result = connectFuture.read()
|
||||
else:
|
||||
raise newException(PunchHoleError, "timeout")
|
||||
except OSError as e:
|
||||
raise newException(PunchHoleError, e.msg)
|
||||
|
|
@ -1,114 +0,0 @@
|
|||
import asyncdispatch, asyncnet, strformat
|
||||
from net import IpAddress, Port, `$`, `==`, parseIpAddress
|
||||
from random import randomize, rand
|
||||
from sequtils import any
|
||||
import ip_packet
|
||||
import message
|
||||
import port_prediction
|
||||
import puncher
|
||||
import raw_socket
|
||||
import utils
|
||||
|
||||
export Puncher, Responder, PunchHoleError, cleanup, respond
|
||||
|
||||
type
|
||||
TSRAttempt = ref object of Attempt
|
||||
seqNums: seq[uint32]
|
||||
future: Future[AsyncSocket]
|
||||
|
||||
TcpSyniResponder* = ref object of Responder
|
||||
|
||||
Request = object
|
||||
dstIp: IpAddress
|
||||
dstPorts: seq[Port]
|
||||
srcIp: IpAddress
|
||||
srcPorts: seq[Port]
|
||||
seqNums: seq[uint32]
|
||||
|
||||
method cleanup*(puncher: TcpSyniResponder) {.async.} =
|
||||
while puncher.attempts.len() != 0:
|
||||
await puncher.attempts.pop().deleteFirewallRules()
|
||||
|
||||
proc initTcpSyniResponder*(): TcpSyniResponder =
|
||||
randomize()
|
||||
TcpSyniResponder()
|
||||
|
||||
proc injectSynPackets(attempt: TSRAttempt) {.async.} =
|
||||
let injectFd = setupTcpInjectingSocket()
|
||||
for dstPort in attempt.dstPorts:
|
||||
let synOut = IpPacket(protocol: tcp, ipAddrSrc: attempt.srcIp,
|
||||
ipAddrDst: attempt.dstIp, ipTTL: 2,
|
||||
tcpPortSrc: attempt.srcPort, tcpPortDst: dstPort,
|
||||
tcpSeqNumber: rand(uint32), tcpAckNumber: 0,
|
||||
tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
|
||||
echo &"[{synOut.ipAddrSrc}:{synOut.tcpPortSrc} -> {synOut.ipAddrDst}:{synOut.tcpPortDst}, SEQ {synOut.tcpSeqNumber}] injecting outgoing SYN"
|
||||
await injectFd.injectTcpPacket(synOut)
|
||||
for seqNum in attempt.seqNums:
|
||||
let synIn = IpPacket(protocol: tcp, ipAddrSrc: attempt.dstIp,
|
||||
ipAddrDst: attempt.srcIp, ipTTL: 64,
|
||||
tcpPortSrc: dstPort,
|
||||
tcpPortDst: attempt.srcPort,
|
||||
tcpSeqNumber: seqNum, tcpAckNumber: 0,
|
||||
tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
|
||||
echo &"[{synIn.ipAddrSrc}:{synIn.tcpPortSrc} -> {synIn.ipAddrDst}:{synIn.tcpPortDst}, SEQ {synIn.tcpSeqNumber}] injecting incoming SYN"
|
||||
await injectFd.injectTcpPacket(synIn)
|
||||
closeSocket(injectFd)
|
||||
|
||||
proc accept(puncher: TcpSyniResponder, srcIp: IpAddress,
|
||||
srcPort: Port) {.async.} =
|
||||
let sock = newAsyncSocket()
|
||||
sock.setSockOpt(OptReuseAddr, true)
|
||||
sock.bindAddr(srcPort, $srcIp)
|
||||
sock.listen()
|
||||
while true:
|
||||
let acceptFuture = sock.accept()
|
||||
await acceptFuture or sleepAsync(Timeout)
|
||||
if acceptFuture.finished():
|
||||
let peer = acceptFuture.read()
|
||||
let (peerAddr, peerPort) = peer.getPeerAddr()
|
||||
let peerIp = parseIpAddress(peerAddr)
|
||||
let i = puncher.findAttempt(srcIp, srcPort, peerIp, @[peerPort])
|
||||
if i == -1:
|
||||
echo "Accepted connection, but no attempt found. Discarding."
|
||||
peer.close()
|
||||
continue
|
||||
else:
|
||||
let attempt = TSRAttempt(puncher.attempts[i])
|
||||
attempt.future.complete(peer)
|
||||
let attempts = puncher.findAttemptsByLocalAddr(srcIp, srcPort)
|
||||
# FIXME: should attempts have timestamps, so we can decide here which ones to delete?
|
||||
if attempts.len() <= 1:
|
||||
break
|
||||
sock.close()
|
||||
|
||||
method respond*(puncher: TcpSyniResponder, args: string):
|
||||
Future[AsyncSocket] {.async.} =
|
||||
let req = parseMessage[Request](args)
|
||||
let localIp = getPrimaryIPAddr(req.dstIp)
|
||||
let existingAttempts = puncher.findAttemptsByLocalAddr(localIp, req.srcPorts[0])
|
||||
if existingAttempts.len() == 0:
|
||||
echo &"accepting connections from {req.dstIp}:{req.dstPorts[0].int}"
|
||||
asyncCheck puncher.accept(localIp, req.srcPorts[0])
|
||||
else:
|
||||
for a in existingAttempts:
|
||||
if a.dstIp == req.dstIp and
|
||||
a.dstPorts.any(proc (p: Port): bool = p in req.dstPorts):
|
||||
raise newException(PunchHoleError, "hole punching for given parameters already active")
|
||||
try:
|
||||
let attempt = TSRAttempt(srcIp: localIp, srcPort: req.srcPorts[0],
|
||||
dstIp: req.dstIp,
|
||||
dstPorts: predictPortRange(req.dstPorts),
|
||||
seqNums: req.seqNums,
|
||||
future: newFuture[AsyncSocket]("respond"))
|
||||
puncher.attempts.add(attempt)
|
||||
await attempt.addFirewallRules() # FIXME: needed?
|
||||
await attempt.injectSynPackets()
|
||||
await attempt.future or sleepAsync(Timeout)
|
||||
await attempt.deleteFirewallRules() # FIXME: needed?
|
||||
puncher.attempts.del(puncher.attempts.find(attempt))
|
||||
if attempt.future.finished():
|
||||
result = attempt.future.read()
|
||||
else:
|
||||
raise newException(PunchHoleError, "timeout")
|
||||
except OSError as e:
|
||||
raise newException(PunchHoleError, e.msg)
|
||||
Loading…
Reference in New Issue