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

1 files changed, 3 insertions, 0 deletions

diff --git a/middleware/proxy/upstream.go b/middleware/proxy/upstream.go
index 52375323e..7f339c01f 100644
--- a/middleware/proxy/upstream.go
+++ b/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
 		}