Use dns.IsSubDomain (#112)

For the match function use the proper thing from go dns. Fix all
callers and tests to use this.

Fixes: #107

core/assets/path.go

@@ -8,9 +8,9 @@ import (
 
 // Path returns the path to the folder
 // where the application may store data. This
-// currently resolves to ~/.caddy
+// currently resolves to ~/.coredns
 func Path() string {
-	return filepath.Join(userHomeDir(), ".caddy")
+	return filepath.Join(userHomeDir(), ".coredns")
 }
 
 // userHomeDir returns the user's home directory according to

core/assets/path_test.go

@@ -6,7 +6,7 @@ import (
 )
 
 func TestPath(t *testing.T) {
-	if actual := Path(); !strings.HasSuffix(actual, ".caddy") {
+	if actual := Path(); !strings.HasSuffix(actual, ".coredns") {
 		t.Errorf("Expected path to be a .caddy folder, got: %v", actual)
 	}
 }

middleware/log/log.go

@@ -22,7 +22,7 @@ type Logger struct {
 func (l Logger) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
 	state := middleware.State{W: w, Req: r}
 	for _, rule := range l.Rules {
-		if middleware.Name(state.Name()).Matches(rule.NameScope) {
+		if middleware.Name(rule.NameScope).Matches(state.Name()) {
 			responseRecorder := middleware.NewResponseRecorder(w)
 			rcode, err := l.Next.ServeDNS(ctx, responseRecorder, r)
 

middleware/name.go

@@ -9,13 +9,14 @@ import (
 // Name represents a domain name.
 type Name string
 
-// Matches checks to see if other matches n.
-//
-// Name matching will probably not always be a direct
-// comparison; this method assures that names can be
-// easily and consistently matched.
-func (n Name) Matches(other string) bool {
-	return strings.HasSuffix(string(n), other)
+// Matches checks to see if other is a subdomain (or the same domain) of n.
+// This method assures that names can be easily and consistently matched.
+func (n Name) Matches(child string) bool {
+	if dns.Name(n) == dns.Name(child) {
+		return true
+	}
+
+	return dns.IsSubDomain(string(n), child)
 }
 
 // Normalize lowercases and makes n fully qualified.

middleware/proxy/upstream.go

@@ -238,6 +238,9 @@ func (u *staticUpstream) Select() *UpstreamHost {
 
 func (u *staticUpstream) IsAllowedPath(name string) bool {
 	for _, ignoredSubDomain := range u.IgnoredSubDomains {
+		if dns.Name(name) == dns.Name(u.From()) {
+			return true
+		}
 		if middleware.Name(name).Matches(ignoredSubDomain + u.From()) {
 			return false
 		}

middleware/proxy/upstream_test.go

@@ -70,7 +70,7 @@ func TestAllowedPaths(t *testing.T) {
 	for i, test := range tests {
 		isAllowed := upstream.IsAllowedPath(test.name)
 		if test.expected != isAllowed {
-			t.Errorf("Test %d: expected %v found %v", i+1, test.expected, isAllowed)
+			t.Errorf("Test %d: expected %v found %v for %s", i+1, test.expected, isAllowed, test.name)
 		}
 	}
 }

middleware/rewrite/condition.go

@@ -76,6 +76,7 @@ func startsWithFunc(a, b string) bool {
 // endsWithFunc is condition for EndsWith operator.
 // It checks if b is a suffix of a.
 func endsWithFunc(a, b string) bool {
+	// TODO(miek): IsSubDomain
 	return strings.HasSuffix(a, b)
 }
 

middleware/zone.go

@@ -1,21 +1,16 @@
 package middleware
 
-import (
-	"strings"
-
-	"github.com/miekg/dns"
-)
+import "github.com/miekg/dns"
 
 type Zones []string
 
-// Matches checks to see if other matches p.  The match will return the most
-// specific zones that matches other. The empty string signals a not found
-// condition.
+// Matches checks is qname is a subdomain of any of the zones in z.  The match
+// will return the most specific zones that matches other. The empty string
+// signals a not found condition.
 func (z Zones) Matches(qname string) string {
 	zone := ""
-	// TODO(miek): use IsSubDomain here?
 	for _, zname := range z {
-		if strings.HasSuffix(qname, zname) {
+		if dns.IsSubDomain(zname, qname) {
 			if len(zname) > len(zone) {
 				zone = zname
 			}