Set the default listen address to "localhost:1081".

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to this project will be documented in this file.
 
 ### Changed
 - The default configuration file path is now `/etc/transocks.toml`.
+- "listen" config option becomes optional.  Default is "localhost:1081".
 - Configuration items for logging is changed.
 
 [cmd]: https://github.com/cybozu-go/cmd

README.md

@@ -66,12 +66,11 @@ Configuration file format
 
 `transocks.toml` is a [TOML][] file.
 
-`listen` and `proxy_url` are mandatory.
-Other items are optional.
+`proxy_url` are mandatory.  Other items are optional.
 
 ```
 # listening address of transocks.
-listen = "localhost:1081"
+listen = "localhost:1081"    # default is "localhost:1081"
 
 proxy_url = "socks5://10.20.30.40:1080"  # for SOCKS5 server
 #proxy_url = "http://10.20.30.40:3128"   # for HTTP proxy server

cmd/transocks/main.go

@@ -18,13 +18,19 @@ type tomlConfig struct {
 	Log      cmd.LogConfig `toml:"log"`
 }
 
+const (
+	defaultAddr = "localhost:1081"
+)
+
 var (
 	configFile = flag.String("f", "/etc/transocks.toml",
 		"TOML configuration file path")
 )
 
 func loadConfig() (*transocks.Config, error) {
-	tc := new(tomlConfig)
+	tc := &tomlConfig{
+		Listen: defaultAddr,
+	}
 	md, err := toml.DecodeFile(*configFile, tc)
 	if err != nil {
 		return nil, err