wireaddr: correct the onion case in wireaddr_from_hostname

And, this time, add tests !

common/test/run-ip_port_parsing.c

@@ -40,6 +40,7 @@ int main(void)
 	setup_locale();
 
 	struct wireaddr addr;
+	struct wireaddr *addresses = tal_arr(NULL, struct wireaddr, 0);
 	char *ip;
 	u16 port;
 
@@ -115,6 +116,11 @@ int main(void)
 
 	assert(parse_wireaddr("odpzvneidqdf5hdq.onion", &addr, 1, false, NULL));
 	assert(addr.port == 1);
+
+	assert(wireaddr_from_hostname(&addresses, "odpzvneidqdf5hdq.onion", 1, NULL, NULL, NULL));
+	assert(! wireaddr_from_hostname(&addresses, "aaa.onion", 1, NULL, NULL, NULL));
+	tal_free(addresses);
+
 	tal_free(tmpctx);
 	return 0;
 }

common/wireaddr.c

@@ -308,19 +308,21 @@ bool wireaddr_from_hostname(struct wireaddr **addrs, const char *hostname,
 	if (strends(hostname, ".onion")) {
 		u8 *dec = b32_decode(tmpctx, hostname,
 				     strlen(hostname) - strlen(".onion"));
+		if (tal_count(*addrs) == 0)
+			tal_resize(addrs, 1);
 		if (tal_count(dec) == TOR_V2_ADDRLEN)
-			addrs[0]->type = ADDR_TYPE_TOR_V2;
+			(*addrs)[0].type = ADDR_TYPE_TOR_V2;
 		else if (tal_count(dec) == TOR_V3_ADDRLEN)
-			addrs[0]->type = ADDR_TYPE_TOR_V3;
+			(*addrs)[0].type = ADDR_TYPE_TOR_V3;
 		else {
 			if (err_msg)
 				*err_msg = "Invalid Tor address";
 			return false;
 		}
 
-		addrs[0]->addrlen = tal_count(dec);
-		addrs[0]->port = port;
-		memcpy(&addrs[0]->addr, dec, tal_count(dec));
+		(*addrs)[0].addrlen = tal_count(dec);
+		(*addrs)[0].port = port;
+		memcpy((*addrs)[0].addr, dec, tal_count(dec));
 		return true;
 	}