From ddb3d8945d4cea38a90819f263d3be5834ceb2a4 Mon Sep 17 00:00:00 2001
From: Ethan Buchman <ethan@coinculture.info>
Date: Wed, 19 Jul 2017 15:03:36 -0400
Subject: [PATCH] p2p: allow listener with no external connection

---
 node/node.go           | 13 +------------
 p2p/listener.go        | 11 +++++++----
 rpc/lib/types/types.go |  1 +
 3 files changed, 9 insertions(+), 16 deletions(-)

diff --git a/node/node.go b/node/node.go
index 4286fece..824a0926 100644
--- a/node/node.go
+++ b/node/node.go
@@ -309,7 +309,7 @@ func NewNode(config *cfg.Config,
 // OnStart starts the Node. It implements cmn.Service.
 func (n *Node) OnStart() error {
 	// Create & add listener
-	protocol, address := ProtocolAndAddress(n.config.P2P.ListenAddress)
+	protocol, address := cmn.ProtocolAndAddress(n.config.P2P.ListenAddress)
 	l := p2p.NewDefaultListener(protocol, address, n.config.P2P.SkipUPNP, n.Logger.With("module", "p2p"))
 	n.sw.AddListener(l)
 
@@ -535,15 +535,4 @@ func (n *Node) DialSeeds(seeds []string) error {
 	return n.sw.DialSeeds(n.addrBook, seeds)
 }
 
-// ProtocolAndAddress returns the transport protocol
-// and the ip address from the given string. Defaults to tcp.
-func ProtocolAndAddress(listenAddr string) (string, string) {
-	protocol, address := "tcp", listenAddr
-	parts := strings.SplitN(address, "://", 2)
-	if len(parts) == 2 {
-		protocol, address = parts[0], parts[1]
-	}
-	return protocol, address
-}
-
 //------------------------------------------------------------------------------
diff --git a/p2p/listener.go b/p2p/listener.go
index 02d958d6..a382fbed 100644
--- a/p2p/listener.go
+++ b/p2p/listener.go
@@ -87,7 +87,7 @@ func NewDefaultListener(protocol string, lAddr string, skipUPNP bool, logger log
 	}
 	// Otherwise just use the local address...
 	if extAddr == nil {
-		extAddr = getNaiveExternalAddress(listenerPort)
+		extAddr = getNaiveExternalAddress(listenerPort, false, logger)
 	}
 	if extAddr == nil {
 		cmn.PanicCrisis("Could not determine external address!")
@@ -197,7 +197,7 @@ func getUPNPExternalAddress(externalPort, internalPort int, logger log.Logger) *
 }
 
 // TODO: use syscalls: http://pastebin.com/9exZG4rh
-func getNaiveExternalAddress(port int) *NetAddress {
+func getNaiveExternalAddress(port int, settleForLocal bool, logger log.Logger) *NetAddress {
 	addrs, err := net.InterfaceAddrs()
 	if err != nil {
 		cmn.PanicCrisis(cmn.Fmt("Could not fetch interface addresses: %v", err))
@@ -209,10 +209,13 @@ func getNaiveExternalAddress(port int) *NetAddress {
 			continue
 		}
 		v4 := ipnet.IP.To4()
-		if v4 == nil || v4[0] == 127 {
+		if v4 == nil || (!settleForLocal && v4[0] == 127) {
 			continue
 		} // loopback
 		return NewNetAddressIPPort(ipnet.IP, uint16(port))
 	}
-	return nil
+
+	// try again, but settle for local
+	logger.Info("Node may not be connected to internet. Settling for local address")
+	return getNaiveExternalAddress(port, true, logger)
 }
diff --git a/rpc/lib/types/types.go b/rpc/lib/types/types.go
index 0267c529..4928db51 100644
--- a/rpc/lib/types/types.go
+++ b/rpc/lib/types/types.go
@@ -144,6 +144,7 @@ type WSRPCContext struct {
 //
 // Determine if its a unix or tcp socket.
 // If tcp, must specify the port; `0.0.0.0` will return incorrectly as "unix" since there's no port
+// TODO: deprecate
 func SocketType(listenAddr string) string {
 	socketType := "unix"
 	if len(strings.Split(listenAddr, ":")) >= 2 {