From 56bfb253e554819977a019e2ecf4a98d783f77ae Mon Sep 17 00:00:00 2001
From: Christian Ulrich <christian@ulrich.earth>
Date: Fri, 25 Sep 2020 17:19:34 +0200
Subject: [PATCH] more meaningful debug messages

---
 tcp_syni.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tcp_syni.nim b/tcp_syni.nim
index 49cbd88..aa68ec2 100644
--- a/tcp_syni.nim
+++ b/tcp_syni.nim
@@ -56,9 +56,7 @@ proc injectTcpPacket(rawFd: AsyncFD, ipPacket: IpPacket) {.async.} =
     toSockAddr(ipPacket.ipAddrDst, ipPacket.tcpPortDst, sockaddr, sockaddrLen)
     await rawFd.sendTo(packet.cstring, packet.len,
                        cast[ptr SockAddr](addr sockaddr), sockaddrLen)
-    echo &"injected {ipPacket.ipAddrSrc}:{ipPacket.tcpPortSrc.int} -> {ipPacket.ipAddrDst}:{ipPacket.tcpPortDst.int} (seq {ipPacket.tcpSeqNumber})"
   except OSError as e:
-    echo &"cannot inject {ipPacket.ipAddrSrc}:{ipPacket.tcpPortSrc.int} -> {ipPacket.ipAddrDst}:{ipPacket.tcpPortDst.int} (seq {ipPacket.tcpSeqNumber}): ", e.msg
     raise newException(PunchHoleError, e.msg)
 
 proc captureSeqNumbers(puncher: TcpSyniPuncher, rawFd: AsyncFD,
@@ -96,6 +94,7 @@ proc captureAndResendAck(puncher: TcpSyniPuncher, captureFd: AsyncFD,
       for port in puncher.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)
           return
 
@@ -201,6 +200,7 @@ proc accept*(puncher: TcpSyniPuncher): Future[AsyncSocket] {.async.} =
                                 tcpAckNumber: 0,
                                 tcpFlags: {SYN},
                                 tcpWindowSize: 1452 * 10)
+        echo &"[{ipPacket.ipAddrSrc}:{ipPacket.tcpPortSrc} -> {ipPacket.ipAddrDst}:{ipPacket.tcpPortDst}, SEQ {ipPacket.tcpSeqNumber}] injecting SYN"
         asyncCheck rawFd.injectTcpPacket(ipPacket)
     let sock = newAsyncSocket()
     sock.setSockOpt(OptReuseAddr, true)