From 9598e746259df6847d200d99d2cd19f9f7ceb44b Mon Sep 17 00:00:00 2001
From: Michael Schmoock <michael@schmoock.net>
Date: Tue, 19 Oct 2021 11:32:52 +0200
Subject: [PATCH] chore: use EXPERIMENTAL for BOLT7 DNS #911

Changelog-EXPERIMENTAL: Ability to announce DNS addresses
---
 connectd/connectd.c  |  6 ++++++
 lightningd/options.c |  2 ++
 tests/test_gossip.py | 19 ++++++++++++++++++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/connectd/connectd.c b/connectd/connectd.c
index e127c81bfe1a..3bbd3df9a98b 100644
--- a/connectd/connectd.c
+++ b/connectd/connectd.c
@@ -928,11 +928,13 @@ static void try_connect_one_addr(struct connecting *connect)
 	bool use_proxy = connect->daemon->always_use_proxy;
 	const struct wireaddr_internal *addr = &connect->addrs[connect->addrnum];
 	struct io_conn *conn;
+#if EXPERIMENTAL_FEATURES /* BOLT7 DNS RFC #911 */
 	struct addrinfo hints, *ais, *aii;
 	struct wireaddr_internal addrhint;
 	int gai_err;
 	struct sockaddr_in *sa4;
 	struct sockaddr_in6 *sa6;
+#endif
 
 	/* In case we fail without a connection, make destroy_io_conn happy */
 	connect->conn = NULL;
@@ -983,6 +985,7 @@ static void try_connect_one_addr(struct connecting *connect)
 			af = AF_INET6;
 			break;
 		case ADDR_TYPE_DNS:
+#if EXPERIMENTAL_FEATURES /* BOLT7 DNS RFC #911 */
 			if (use_proxy) /* hand it to the proxy */
 				break;
 			/* Resolve with getaddrinfo */
@@ -1022,6 +1025,7 @@ static void try_connect_one_addr(struct connecting *connect)
 				addr = &connect->addrs[connect->addrnum];
 			}
 			freeaddrinfo(ais);
+#endif
 			goto next;
 		case ADDR_TYPE_WEBSOCKET:
 			af = -1;
@@ -1663,8 +1667,10 @@ static void add_seed_addrs(struct wireaddr_internal **addrs,
 		                                   NULL, broken_reply, NULL);
 		if (new_addrs) {
 			for (size_t j = 0; j < tal_count(new_addrs); j++) {
+#if EXPERIMENTAL_FEATURES /* BOLT7 DNS RFC #911 */
 				if (new_addrs[j].type == ADDR_TYPE_DNS)
 					continue;
+#endif
 				struct wireaddr_internal a;
 				a.itype = ADDR_INTERNAL_WIREADDR;
 				a.u.wireaddr = new_addrs[j];
diff --git a/lightningd/options.c b/lightningd/options.c
index 8e903cfb3c94..4e79efeb32f2 100644
--- a/lightningd/options.c
+++ b/lightningd/options.c
@@ -221,6 +221,7 @@ static char *opt_add_addr_withtype(const char *arg,
 		tal_arr_expand(&ld->proposed_wireaddr, wi);
 	}
 
+#if EXPERIMENTAL_FEATURES /* BOLT7 DNS RFC #911 */
 	/* Add ADDR_TYPE_DNS to announce DNS hostnames */
 	if (is_dnsaddr(address) && ala & ADDR_ANNOUNCE) {
 		memset(&wi, 0, sizeof(wi));
@@ -234,6 +235,7 @@ static char *opt_add_addr_withtype(const char *arg,
 		tal_arr_expand(&ld->proposed_listen_announce, ADDR_ANNOUNCE);
 		tal_arr_expand(&ld->proposed_wireaddr, wi);
 	}
+#endif
 
 	return NULL;
 
diff --git a/tests/test_gossip.py b/tests/test_gossip.py
index d486eb32876c..d193b81a9157 100644
--- a/tests/test_gossip.py
+++ b/tests/test_gossip.py
@@ -4,7 +4,8 @@
 from fixtures import TEST_NETWORK
 from pyln.client import RpcError, Millisatoshi
 from utils import (
-    DEVELOPER, wait_for, TIMEOUT, only_one, sync_blockheight, expected_node_features, COMPAT
+    DEVELOPER, wait_for, TIMEOUT, only_one, sync_blockheight,
+    expected_node_features, COMPAT, EXPERIMENTAL_FEATURES
 )
 
 import json
@@ -118,6 +119,13 @@ def test_announce_address(node_factory, bitcoind):
              '::'],
             'log-level': 'io',
             'dev-allow-localhost': None}
+    if not EXPERIMENTAL_FEATURES:  # BOLT7 DNS RFC #911
+        opts = {'disable-dns': None, 'announce-addr':
+                ['4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion',
+                 '1.2.3.4:1234',
+                 '::'],
+                'log-level': 'io',
+                'dev-allow-localhost': None}
     l1, l2 = node_factory.get_nodes(2, opts=[opts, {}])
 
     l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
@@ -127,6 +135,14 @@ def test_announce_address(node_factory, bitcoind):
     l1.wait_channel_active(scid)
     l2.wait_channel_active(scid)
 
+    if not EXPERIMENTAL_FEATURES:  # BOLT7 DNS RFC #911
+        l1.daemon.wait_for_log(r"\[OUT\] 0101.*47"
+                               "010102030404d2"
+                               "017f000001...."
+                               "02000000000000000000000000000000002607"
+                               "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba50230032607")
+        return
+
     # We should see it send node announce with all addresses (257 = 0x0101)
     # Note: local ephemeral port is masked out.
     # Note: Since we `disable-dns` it should not announce a resolved IPv4
@@ -154,6 +170,7 @@ def test_announce_address(node_factory, bitcoind):
     assert addresses_dns[1]['port'] == 1236
 
 
+@unittest.skipIf(not EXPERIMENTAL_FEATURES, "BOLT7 DNS RFC #911")
 @pytest.mark.developer("gossip without DEVELOPER=1 is slow")
 def test_announce_and_connect_via_dns(node_factory, bitcoind):
     """ Test that DNS annoucements propagate and can be used when connecting.