core: Bind all listeners to wildcard host by default (closes #208)

This behavior can still be overridden by bind directive

config/config.go

@@ -182,11 +182,7 @@ func arrangeBindings(allConfigs []server.Config) (Group, error) {
 // resolve, that host can still be served but will be listening on
 // the wildcard host instead. This function takes care of this for you.
 func resolveAddr(conf server.Config) (resolvAddr *net.TCPAddr, warnErr error, fatalErr error) {
-	// The host to bind to may be different from the (virtual)host to serve
 	bindHost := conf.BindHost
-	if bindHost == "" {
-		bindHost = conf.Host
-	}
 
 	resolvAddr, warnErr = net.ResolveTCPAddr("tcp", net.JoinHostPort(bindHost, conf.Port))
 	if warnErr != nil {

config/config_test.go

@@ -22,13 +22,15 @@ func TestResolveAddr(t *testing.T) {
 		expectedIP     string
 		expectedPort   int
 	}{
-		{server.Config{Host: "localhost", Port: "1234"}, false, false, "127.0.0.1", 1234},
-		{server.Config{Host: "127.0.0.1", Port: "1234"}, false, false, "127.0.0.1", 1234},
-		{server.Config{Host: "should-not-resolve", Port: "1234"}, true, false, "0.0.0.0", 1234},
-		{server.Config{Host: "localhost", Port: "http"}, false, false, "127.0.0.1", 80},
-		{server.Config{Host: "localhost", Port: "https"}, false, false, "127.0.0.1", 443},
-		{server.Config{Host: "", Port: "1234"}, false, false, "<nil>", 1234},
-		{server.Config{Host: "localhost", Port: "abcd"}, false, true, "", 0},
+		{server.Config{Host: "127.0.0.1", Port: "1234"}, false, false, "<nil>", 1234},
+		{server.Config{Host: "localhost", Port: "80"}, false, false, "<nil>", 80},
+		{server.Config{BindHost: "localhost", Port: "1234"}, false, false, "127.0.0.1", 1234},
+		{server.Config{BindHost: "127.0.0.1", Port: "1234"}, false, false, "127.0.0.1", 1234},
+		{server.Config{BindHost: "should-not-resolve", Port: "1234"}, true, false, "0.0.0.0", 1234},
+		{server.Config{BindHost: "localhost", Port: "http"}, false, false, "127.0.0.1", 80},
+		{server.Config{BindHost: "localhost", Port: "https"}, false, false, "127.0.0.1", 443},
+		{server.Config{BindHost: "", Port: "1234"}, false, false, "<nil>", 1234},
+		{server.Config{BindHost: "localhost", Port: "abcd"}, false, true, "", 0},
 		{server.Config{BindHost: "127.0.0.1", Host: "should-not-be-used", Port: "1234"}, false, false, "127.0.0.1", 1234},
 		{server.Config{BindHost: "localhost", Host: "should-not-be-used", Port: "1234"}, false, false, "127.0.0.1", 1234},
 		{server.Config{BindHost: "should-not-resolve", Host: "localhost", Port: "1234"}, true, false, "0.0.0.0", 1234},

main.go

@@ -87,14 +87,13 @@ func main() {
 					fmt.Printf("Notice: %s is only accessible on this machine (%s)\n",
 						conf.Host, addr.IP.String())
 				}
-			}
-
-			if !checkedFdLimit && !addr.IP.IsLoopback() {
+				if !checkedFdLimit && !addr.IP.IsLoopback() && !isLocalhost(conf.Host) {
 					checkFdlimit()
 					checkedFdLimit = true
 				}
 			}
 		}
+	}
 
 	// Wait for all listeners to stop
 	app.Wg.Wait()
@@ -111,7 +110,7 @@ func checkFdlimit() {
 			// Note that an error here need not be reported
 			lim, err := strconv.Atoi(string(bytes.TrimSpace(out)))
 			if err == nil && lim < min {
-				fmt.Printf("Warning: File descriptor limit %d is too low for production sites.\nAt least %d is recommended. Set with \"ulimit -n %d\".\n", lim, min, min)
+				fmt.Printf("Warning: File descriptor limit %d is too low for production sites. At least %d is recommended. Set with \"ulimit -n %d\".\n", lim, min, min)
 			}
 		}
 	}