inany: Add inany_pton() helper

We already have an inany_ntop() function to format inany addresses into
text.  Add inany_pton() to parse them from text, and use it in
conf_ports().

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

conf.c

@@ -215,9 +215,6 @@ static void conf_ports(const struct ctx *c, char optname, const char *optarg,
 		if (ifname == buf + 1) {	/* Interface without address */
 			addr = NULL;
 		} else {
-			struct in6_addr a6;
-			struct in_addr a4;
-
 			p = buf;
 
 			/* Allow square brackets for IPv4 too for convenience */
@@ -226,11 +223,7 @@ static void conf_ports(const struct ctx *c, char optname, const char *optarg,
 				p++;
 			}
 
-			if (inet_pton(AF_INET, p, &a4))
+			if (!inany_pton(p, addr))
-				inany_from_af(addr, AF_INET, &a4);
-			else if (inet_pton(AF_INET6, p, &a6))
-				inany_from_af(addr, AF_INET6, &a6);
-			else
 				goto bad;
 		}
 	} else {

inany.c

@@ -36,3 +36,23 @@ const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size)
 
 	return inet_ntop(AF_INET6, &src->a6, dst, size);
 }
+
+/** inany_pton - Parse an IPv[46] address from text format
+ * @src:	IPv[46] address
+ * @dst:	output buffer, filled with parsed address
+ *
+ * Return: On success, 1, if no parseable address is found, 0
+ */
+int inany_pton(const char *src, union inany_addr *dst)
+{
+	if (inet_pton(AF_INET, src, &dst->v4mapped.a4)) {
+		memset(&dst->v4mapped.zero, 0, sizeof(dst->v4mapped.zero));
+		memset(&dst->v4mapped.one, 0xff, sizeof(dst->v4mapped.one));
+		return 1;
+	}
+
+	if (inet_pton(AF_INET6, src, &dst->a6))
+		return 1;
+
+	return 0;
+}

inany.h

@@ -270,5 +270,6 @@ static inline void inany_siphash_feed(struct siphash_state *state,
 #define INANY_ADDRSTRLEN	MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)
 
 const char *inany_ntop(const union inany_addr *src, char *dst, socklen_t size);
+int inany_pton(const char *src, union inany_addr *dst);
 
 #endif /* INANY_H */