close raw sockets too

tcp_syni.nim

@@ -95,6 +95,7 @@ proc injectTcpPacket(rawFd: AsyncFD, ipPacket: IpPacket) {.async.} =
 proc captureSeqNumbers(attempt: ConnectAttempt, rawFd: AsyncFD,
                        cb: PunchProgressCb) {.async.} =
   # FIXME: timeout?
+  # FIXME: create raw socket here
   var seqNums = newSeq[uint32]()
   while seqNums.len < attempt.dstPorts.len:
     let packet = await rawFd.recv(4000)
@@ -110,10 +111,13 @@ proc captureSeqNumbers(attempt: ConnectAttempt, rawFd: AsyncFD,
         if parsed.tcpPortDst.int == port.int:
           seqNums.add(parsed.tcpSeqNumber)
           break
+  closeSocket(rawFd)
   await cb(seqNums)
 
 proc captureAndResendAck(attempt: ConnectAttempt, captureFd: AsyncFD,
                          injectFd: AsyncFD) {.async.} =
+  # FIXME: create raw socket here
+  block loops:
     while true:
       let packet = await captureFd.recv(4000)
       if packet == "":
@@ -129,7 +133,9 @@ proc captureAndResendAck(attempt: ConnectAttempt, captureFd: AsyncFD,
             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)
-          return
+            break loops
+  closeSocket(captureFd)
+  closeSocket(injectFd)
 
 proc initPuncher*(): TcpSyniPuncher = TcpSyniPuncher()
 
@@ -291,6 +297,7 @@ proc accept*(puncher: TcpSyniPuncher, srcPort: Port, dstIp: IpAddress,
                                 tcpFlags: {SYN}, tcpWindowSize: 1452 * 10)
         echo &"[{ipPacket.ipAddrSrc}:{ipPacket.tcpPortSrc} -> {ipPacket.ipAddrDst}:{ipPacket.tcpPortDst}, SEQ {ipPacket.tcpSeqNumber}] injecting SYN"
         asyncCheck rawFd.injectTcpPacket(ipPacket)
+    closeSocket(rawFd)
     await attempt.future or sleepAsync(Timeout)
     await attempt.deleteFirewallRules()
     puncher.acceptAttempts.del(puncher.acceptAttempts.find(attempt))