From fdeae087969bc44c6f3c71dbdd28dee95ea382a2 Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Thu, 21 Jan 2021 16:52:25 +0100
Subject: WIP debug tun

---
 tun/netstack/tun.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'tun/netstack/tun.go')

diff --git a/tun/netstack/tun.go b/tun/netstack/tun.go
index 6bdea23..50da0d7 100644
--- a/tun/netstack/tun.go
+++ b/tun/netstack/tun.go
@@ -721,6 +721,7 @@ func partialDeadline(now, deadline time.Time, addrsRemaining int) (time.Time, er
 }
 
 func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
+        fmt.Warningf("tun_net.DialContext: ", network, address)
 	if ctx == nil {
 		panic("nil context")
 	}
@@ -733,23 +734,28 @@ func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.
 		acceptV6 = network[3] == '6'
 	}
 	if !acceptV4 && !acceptV6 {
+                fmt.Warningf("DialContext no v4 v6")
 		return nil, &net.OpError{Op: "dial", Err: net.UnknownNetworkError(network)}
 	}
 	if network[:3] == "udp" {
 		useUDP = true
 	} else if network[:3] != "tcp" {
+                fmt.Warningf("DialContext no udp no tcp")
 		return nil, &net.OpError{Op: "dial", Err: net.UnknownNetworkError(network)}
 	}
 	host, sport, err := net.SplitHostPort(address)
 	if err != nil {
+                fmt.Warningf("DialContext failed split", address, err)
 		return nil, &net.OpError{Op: "dial", Err: err}
 	}
 	port, err := strconv.Atoi(sport)
 	if err != nil || port < 0 || port > 65535 {
+                fmt.Warningf("DialContext failed port", sport, err)
 		return nil, &net.OpError{Op: "dial", Err: errNumericPort}
 	}
 	allAddr, err := tnet.LookupContextHost(ctx, host)
 	if err != nil {
+                fmt.Warningf("LookupContextHost failed: ", host, err)
 		return nil, &net.OpError{Op: "dial", Err: err}
 	}
 	var addrs []net.IP
@@ -761,6 +767,7 @@ func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.
 		}
 	}
 	if len(addrs) == 0 && len(allAddr) != 0 {
+                fmt.Warningf("DialContext failed no addr")
 		return nil, &net.OpError{Op: "dial", Err: errNoSuitableAddress}
 	}
 
@@ -774,6 +781,7 @@ func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.
 			} else if err == context.DeadlineExceeded {
 				err = errTimeout
 			}
+                        fmt.Warningf("DialContext failed context done", err)
 			return nil, &net.OpError{Op: "dial", Err: err}
 		default:
 		}
@@ -801,6 +809,7 @@ func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.
 			c, err = tnet.DialContextTCP(dialCtx, &net.TCPAddr{IP: addr, Port: port})
 		}
 		if err == nil {
+                        fmt.Warningf("DialContext success")
 			return c, nil
 		}
 		if firstErr == nil {
@@ -810,6 +819,7 @@ func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.
 	if firstErr == nil {
 		firstErr = &net.OpError{Op: "dial", Err: errMissingAddress}
 	}
+        fmt.Warningf("DialContext failed", firstErr)
 	return nil, firstErr
 }
 
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