1 files changed, 0 insertions, 68 deletions
diff --git a/middleware/pkg/dnsutil/reverse.go b/middleware/pkg/dnsutil/reverse.go
deleted file mode 100644
index daf9cc600..000000000
--- a/middleware/pkg/dnsutil/reverse.go
+++ /dev/null
@@ -1,68 +0,0 @@
-package dnsutil
-
-import (
-	"net"
-	"strings"
-)
-
-// ExtractAddressFromReverse turns a standard PTR reverse record name
-// into an IP address. This works for ipv4 or ipv6.
-//
-// 54.119.58.176.in-addr.arpa. becomes 176.58.119.54. If the conversion
-// failes the empty string is returned.
-func ExtractAddressFromReverse(reverseName string) string {
-	search := ""
-
-	f := reverse
-
-	switch {
-	case strings.HasSuffix(reverseName, v4arpaSuffix):
-		search = strings.TrimSuffix(reverseName, v4arpaSuffix)
-	case strings.HasSuffix(reverseName, v6arpaSuffix):
-		search = strings.TrimSuffix(reverseName, v6arpaSuffix)
-		f = reverse6
-	default:
-		return ""
-	}
-
-	// Reverse the segments and then combine them.
-	return f(strings.Split(search, "."))
-}
-
-func reverse(slice []string) string {
-	for i := 0; i < len(slice)/2; i++ {
-		j := len(slice) - i - 1
-		slice[i], slice[j] = slice[j], slice[i]
-	}
-	ip := net.ParseIP(strings.Join(slice, ".")).To4()
-	if ip == nil {
-		return ""
-	}
-	return ip.String()
-}
-
-// reverse6 reverse the segments and combine them according to RFC3596:
-// b.a.9.8.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2
-// is reversed to 2001:db8::567:89ab
-func reverse6(slice []string) string {
-	for i := 0; i < len(slice)/2; i++ {
-		j := len(slice) - i - 1
-		slice[i], slice[j] = slice[j], slice[i]
-	}
-	slice6 := []string{}
-	for i := 0; i < len(slice)/4; i++ {
-		slice6 = append(slice6, strings.Join(slice[i*4:i*4+4], ""))
-	}
-	ip := net.ParseIP(strings.Join(slice6, ":")).To16()
-	if ip == nil {
-		return ""
-	}
-	return ip.String()
-}
-
-const (
-	// v4arpaSuffix is the reverse tree suffix for v4 IP addresses.
-	v4arpaSuffix = ".in-addr.arpa."
-	// v6arpaSuffix is the reverse tree suffix for v6 IP addresses.
-	v6arpaSuffix = ".ip6.arpa."
-)