fix: allow ipv4-mapped ipv6 addresses

Signed-off-by: Steven Kreitzer <[email protected]>

source/source.go

@@ -21,7 +21,7 @@ import (
 	"context"
 	"fmt"
 	"math"
-	"net"
+	"net/netip"
 	"reflect"
 	"strconv"
 	"strings"
@@ -257,9 +257,10 @@ func getTargetsFromTargetAnnotation(annotations map[string]string) endpoint.Targ
 // suitableType returns the DNS resource record type suitable for the target.
 // In this case type A for IPs and type CNAME for everything else.
 func suitableType(target string) string {
-	if net.ParseIP(target) != nil && net.ParseIP(target).To4() != nil {
+	netIP, err := netip.ParseAddr(target)
+	if err == nil && netIP.Is4() {
 		return endpoint.RecordTypeA
-	} else if net.ParseIP(target) != nil && net.ParseIP(target).To16() != nil {
+	} else if err == nil && netIP.Is6() {
 		return endpoint.RecordTypeAAAA
 	}
 	return endpoint.RecordTypeCNAME
@@ -390,6 +391,6 @@ func waitForDynamicCacheSync(ctx context.Context, factory dynamicInformerFactory
 
 // isIPv6String returns if ip is IPv6.
 func isIPv6String(ip string) bool {
-	netIP := net.ParseIP(ip)
-	return netIP != nil && netIP.To4() == nil
+	netIP, err := netip.ParseAddr(ip)
+	return err == nil && netIP.Is6()
 }