1 files changed, 48 insertions, 0 deletions
diff --git a/bin/tools/arpaname.c b/bin/tools/arpaname.c
new file mode 100644
index 0000000..cfbe187
--- /dev/null
+++ b/bin/tools/arpaname.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <stdio.h>
+
+#include <isc/net.h>
+#include <isc/print.h>
+
+#define UNUSED(x) (void)(x)
+
+int
+main(int argc, char *argv[]) {
+	unsigned char buf[16];
+	int i;
+
+	UNUSED(argc);
+
+	while (argv[1]) {
+		if (inet_pton(AF_INET6, argv[1], buf) == 1) {
+			for (i = 15; i >= 0; i--) {
+				fprintf(stdout, "%X.%X.", buf[i] & 0xf,
+					(buf[i] >> 4) & 0xf);
+			}
+			fprintf(stdout, "IP6.ARPA\n");
+			argv++;
+			continue;
+		}
+		if (inet_pton(AF_INET, argv[1], buf) == 1) {
+			fprintf(stdout, "%u.%u.%u.%u.IN-ADDR.ARPA\n", buf[3],
+				buf[2], buf[1], buf[0]);
+			argv++;
+			continue;
+		}
+		return (1);
+	}
+	fflush(stdout);
+	return (ferror(stdout));
+}