Revert "bind: support multiple values (#2128)"

This reverts commit 3a810c65.

caddyhttp/bind/bind.go

@@ -29,17 +29,10 @@ func init() {
 func setupBind(c *caddy.Controller) error {
 	config := httpserver.GetConfig(c)
 	for c.Next() {
-		args := c.RemainingArgs()
-
-		if len(args) == 0 {
-			return c.Errf("Expected at least one address")
-		}
-
-		for _, addr := range args {
-			config.ListenHosts = append(config.ListenHosts, addr)
+		if !c.Args(&config.ListenHost) {
+			return c.ArgErr()
 		}
-
-		config.TLS.ListenHost = config.ListenHosts[0] // necessary for ACME challenges, see issue #309
+		config.TLS.ListenHost = config.ListenHost // necessary for ACME challenges, see issue #309
 	}
 	return nil
 }

caddyhttp/bind/bind_test.go

@@ -15,7 +15,6 @@
 package bind
 
 import (
-	"reflect"
 	"testing"
 
 	"github.com/mholt/caddy"
@@ -23,34 +22,17 @@ import (
 )
 
 func TestSetupBind(t *testing.T) {
-	for _, testcase := range []struct {
-		Bind    string
-		Hosts   []string
-		TLSHost string
-	}{
-		{
-			Bind:    "bind 1.2.3.4",
-			Hosts:   []string{"1.2.3.4"},
-			TLSHost: "1.2.3.4",
-		},
-		{
-			Bind:    "bind 1.2.3.4 5.6.7.8",
-			Hosts:   []string{"1.2.3.4", "5.6.7.8"},
-			TLSHost: "1.2.3.4",
-		},
-	} {
-		c := caddy.NewTestController("http", testcase.Bind)
+	c := caddy.NewTestController("http", `bind 1.2.3.4`)
 	err := setupBind(c)
 	if err != nil {
 		t.Fatalf("Expected no errors, but got: %v", err)
 	}
 
 	cfg := httpserver.GetConfig(c)
-		if got, want := cfg.ListenHosts, testcase.Hosts; !reflect.DeepEqual(got, want) {
+	if got, want := cfg.ListenHost, "1.2.3.4"; got != want {
 		t.Errorf("Expected the config's ListenHost to be %s, was %s", want, got)
 	}
-		if got, want := cfg.TLS.ListenHost, testcase.TLSHost; got != want {
+	if got, want := cfg.TLS.ListenHost, "1.2.3.4"; got != want {
 		t.Errorf("Expected the TLS config's ListenHost to be %s, was %s", want, got)
 	}
-	}
 }

caddyhttp/httpserver/https.go

@@ -205,7 +205,7 @@ func redirPlaintextHost(cfg *SiteConfig) *SiteConfig {
 
 	return &SiteConfig{
 		Addr:       Address{Original: addr, Host: host, Port: port},
-		ListenHosts: cfg.ListenHosts,
+		ListenHost: cfg.ListenHost,
 		middleware: []Middleware{redirMiddleware},
 		TLS:        &caddytls.Config{AltHTTPPort: cfg.TLS.AltHTTPPort, AltTLSSNIPort: cfg.TLS.AltTLSSNIPort},
 		Timeouts:   cfg.Timeouts,

caddyhttp/httpserver/https_test.go

@@ -19,7 +19,6 @@ import (
 	"net"
 	"net/http"
 	"net/http/httptest"
-	"reflect"
 	"testing"
 
 	"github.com/mholt/caddy/caddytls"
@@ -29,7 +28,7 @@ func TestRedirPlaintextHost(t *testing.T) {
 	for i, testcase := range []struct {
 		Host        string // used for the site config
 		Port        string
-		ListenHosts []string
+		ListenHost  string
 		RequestHost string // if different from Host
 	}{
 		{
@@ -45,16 +44,12 @@ func TestRedirPlaintextHost(t *testing.T) {
 		},
 		{
 			Host:       "foohost",
-			ListenHosts: []string{"93.184.216.34"},
+			ListenHost: "93.184.216.34",
 		},
 		{
 			Host:       "foohost",
 			Port:       "1234",
-			ListenHosts: []string{"93.184.216.34"},
-		},
-		{
-			Host:        "foohost",
-			ListenHosts: []string{"127.0.0.1", "127.0.0.2"},
+			ListenHost: "93.184.216.34",
 		},
 		{
 			Host: "foohost",
@@ -75,7 +70,7 @@ func TestRedirPlaintextHost(t *testing.T) {
 				Host: testcase.Host,
 				Port: testcase.Port,
 			},
-			ListenHosts: testcase.ListenHosts,
+			ListenHost: testcase.ListenHost,
 			TLS:        new(caddytls.Config),
 		})
 
@@ -83,7 +78,7 @@ func TestRedirPlaintextHost(t *testing.T) {
 		if actual, expected := cfg.Addr.Host, testcase.Host; actual != expected {
 			t.Errorf("Test %d: Expected redir config to have host %s but got %s", i, expected, actual)
 		}
-		if actual, expected := cfg.ListenHosts, testcase.ListenHosts; !reflect.DeepEqual(actual, expected) {
+		if actual, expected := cfg.ListenHost, testcase.ListenHost; actual != expected {
 			t.Errorf("Test %d: Expected redir config to have bindhost %s but got %s", i, expected, actual)
 		}
 		if actual, expected := cfg.Addr.Port, HTTPPort; actual != expected {

caddyhttp/httpserver/plugin.go

@@ -239,18 +239,9 @@ func (h *httpContext) MakeServers() ([]caddy.Server, error) {
 		// see if all the addresses (both sites and
 		// listeners) are loopback to help us determine
 		// if this is a "production" instance or not
-		for _, listenHost := range cfg.ListenHosts {
 		if !atLeastOneSiteLooksLikeProduction {
 			if !caddy.IsLoopback(cfg.Addr.Host) &&
-					!caddy.IsLoopback(listenHost) &&
-					(caddytls.QualifiesForManagedTLS(cfg) ||
-						caddytls.HostQualifies(cfg.Addr.Host)) {
-					atLeastOneSiteLooksLikeProduction = true
-				}
-			}
-		}
-		if !atLeastOneSiteLooksLikeProduction && len(cfg.ListenHosts) == 0 {
-			if !caddy.IsLoopback(cfg.Addr.Host) &&
+				!caddy.IsLoopback(cfg.ListenHost) &&
 				(caddytls.QualifiesForManagedTLS(cfg) ||
 					caddytls.HostQualifies(cfg.Addr.Host)) {
 				atLeastOneSiteLooksLikeProduction = true
@@ -377,31 +368,20 @@ func groupSiteConfigsByListenAddr(configs []*SiteConfig) (map[string][]*SiteConf
 
 	for _, conf := range configs {
 		// We would add a special case here so that localhost addresses
-		// bind to 127.0.0.1 if conf.ListenHosts is not already set, which
+		// bind to 127.0.0.1 if conf.ListenHost is not already set, which
 		// would prevent outsiders from even connecting; but that was problematic:
 		// https://caddy.community/t/wildcard-virtual-domains-with-wildcard-roots/221/5?u=matt
 
 		if conf.Addr.Port == "" {
 			conf.Addr.Port = Port
 		}
-
-		if len(conf.ListenHosts) == 0 {
-			addr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort("", conf.Addr.Port))
+		addr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(conf.ListenHost, conf.Addr.Port))
 		if err != nil {
 			return nil, err
 		}
 		addrstr := addr.String()
 		groups[addrstr] = append(groups[addrstr], conf)
 	}
-		for _, host := range conf.ListenHosts {
-			addr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(host, conf.Addr.Port))
-			if err != nil {
-				return nil, err
-			}
-			addrstr := addr.String()
-			groups[addrstr] = append(groups[addrstr], conf)
-		}
-	}
 
 	return groups, nil
 }

caddyhttp/httpserver/plugin_test.go

@@ -15,7 +15,6 @@
 package httpserver
 
 import (
-	"reflect"
 	"strings"
 	"testing"
 
@@ -348,28 +347,3 @@ func TestHideCaddyfile(t *testing.T) {
 	}
 	t.Fatal("Caddyfile missing from HiddenFiles")
 }
-
-func TestGroupSiteConfigsByListenAddr(t *testing.T) {
-	cfg := []*SiteConfig{
-		{
-			ListenHosts: []string{"127.0.0.1", "::1"},
-		},
-		{
-			Addr: Address{
-				Port: "80",
-			},
-		},
-	}
-	groups, err := groupSiteConfigsByListenAddr(cfg)
-	if err != nil {
-		t.Fatal("Failed to group SiteConfigs by listen address")
-	}
-	actual := []string{}
-	for k := range groups {
-		actual = append(actual, k)
-	}
-	expected := []string{"127.0.0.1:" + Port, "[::1]:" + Port, ":80"}
-	if !reflect.DeepEqual(actual, expected) {
-		t.Errorf("Expected listen on %#v, but got %#v", expected, actual)
-	}
-}

caddyhttp/httpserver/server.go

@@ -419,7 +419,7 @@ func (s *Server) serveHTTP(w http.ResponseWriter, r *http.Request) (int, error)
 
 	// we still check for ACME challenge if the vhost exists,
 	// because we must apply its HTTP challenge config settings
-	if caddytls.HTTPChallengeHandler(w, r, vhost.ListenHosts[0]) {
+	if caddytls.HTTPChallengeHandler(w, r, vhost.ListenHost) {
 		return 0, nil
 	}
 

caddyhttp/httpserver/siteconfig.go

@@ -31,7 +31,7 @@ type SiteConfig struct {
 
 	// The hostname to bind listener to;
 	// defaults to Addr.Host
-	ListenHosts []string
+	ListenHost string
 
 	// TLS configuration
 	TLS *caddytls.Config