inany: Add inany_ntop() helper

Add this helper to format an inany into either IPv4 or IPv6 text
format as appropriate.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/inany.c b/inany.c
new file mode 100644
index 0000000..edf0b05
--- /dev/null
+++ b/inany.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright Red Hat
+ * Author: David Gibson <david@gibson.dropbear.id.au>
+ *
+ * inany.c - Types and helpers for handling addresses which could be
+ *           IPv6 or IPv4 (encoded as IPv4-mapped IPv6 addresses)
+ */
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "util.h"
+#include "siphash.h"
+#include "inany.h"
+
+/** inany_ntop - Convert an IPv[46] address to text format
+ * @src:	IPv[46] address
+ * @dst:	output buffer, minimum INANY_ADDRSTRLEN bytes
+ * @size:	size of buffer at @dst
+ *
+ * Return: On success, a non-null pointer to @dst, NULL on failure
+ */
+/* cppcheck-suppress unusedFunction */
+const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size)
+{
+	const struct in_addr *v4 = inany_v4(src);
+
+	if (v4)
+		return inet_ntop(AF_INET, v4, dst, size);
+
+	return inet_ntop(AF_INET6, &src->a6, dst, size);
+}