[proxy] Add support for tcp:// prefix on listen addresses

prog/weaveproxy/main.go

@@ -13,7 +13,7 @@ import (
 var (
 	version           = "(unreleased version)"
 	defaultDockerAddr = "unix:///var/run/docker.sock"
-	defaultListenAddr = ":12375"
+	defaultListenAddr = "tcp://0.0.0.0:12375"
 )
 
 func main() {
@@ -52,6 +52,16 @@ func main() {
 	Info.Println("weave proxy", version)
 	Info.Println("Command line arguments:", strings.Join(os.Args[1:], " "))
 
+	protoAddrParts := strings.SplitN(c.ListenAddr, "://", 2)
+	if len(protoAddrParts) == 2 {
+		if protoAddrParts[0] != "tcp" {
+			Error.Fatalf("Invalid protocol format: %q", protoAddrParts[0])
+		}
+		c.ListenAddr = protoAddrParts[1]
+	} else {
+		c.ListenAddr = protoAddrParts[0]
+	}
+
 	p, err := proxy.NewProxy(c)
 	if err != nil {
 		Error.Fatalf("Could not start proxy: %s", err)

weave

@@ -51,7 +51,7 @@ usage() {
     echo "where <peer>    = <ip_address_or_fqdn>[:<port>]"
     echo "      <cidr>    = <ip_address>/<routing_prefix_length>"
     echo "      <peer_id> = <nickname> or weave internal peer ID"
-    echo "      <address> = [<ip_address>]:<port>"
+    echo "      <address> = [tcp://][<ip_address>]:<port>"
     exit 1
 }