lightningd: allow extra tlv types in non-experimental mode.

The old `experimental-accept-extra-tlv-types` is now `accept-htlc-tlv-types`.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: Config: `accept-htlc-tlv-types` lets us accept unknown even HTLC TLV fields we would normally reject on parsing (was EXPERIMENTAL-only `experimental-accept-extra-tlv-types`).

doc/lightning-listconfigs.7.md

@@ -97,7 +97,8 @@ On success, an object is returned, containing:
 - **log-timestamps** (boolean, optional): `log-timestamps` field from config or cmdline, or default
 - **force-feerates** (string, optional): force-feerate configuration setting, if any
 - **subdaemon** (string, optional): `subdaemon` fields from config or cmdline if any (can be more than one)
-- **fetchinvoice-noconnect** (boolean, optional): `featchinvoice-noconnect` fileds from config or cmdline, or default
+- **fetchinvoice-noconnect** (boolean, optional): `fetchinvoice-noconnect` fields from config or cmdline, or default
+- **accept-htlc-tlv-types** (string, optional): `accept-extra-tlvs-type` fields from config or cmdline, or not present
 - **tor-service-password** (string, optional): `tor-service-password` field from config or cmdline, if any
 - **dev-allowdustreserve** (boolean, optional): Whether we allow setting dust reserves
 
@@ -217,5 +218,4 @@ RESOURCES
 ---------
 
 Main web site: <https://github.com/ElementsProject/lightning>
-
-[comment]: # ( SHA256STAMP:310cc00ef62e7075d5d2588b0492c2dd96f507cc739f67d56ccc6c4f3135bca5)
+[comment]: # ( SHA256STAMP:5871ac751654339ed65ab905d61f0bc3afbb8576a33a5c4e9a73d2084f438582)

doc/lightningd-config.5.md

@@ -424,6 +424,12 @@ the outgoing is redeemed.
 might need to redeem this on-chain, so this is the number of blocks we
 have to do that.
 
+* **accept-htlc-tlv-types**=*types*
+
+  Normally HTLC onions which contain unknown even fields are rejected.
+This option specifies that these (comma-separated) types are to be
+accepted, and ignored.
+
 ### Invoice control options:
 
 * **autocleaninvoice-cycle**=*SECONDS* [plugin `autoclean`]

doc/schemas/listconfigs.schema.json

@@ -281,7 +281,11 @@
     },
     "fetchinvoice-noconnect": {
       "type": "boolean",
-      "description": "`featchinvoice-noconnect` fileds from config or cmdline, or default"
+      "description": "`fetchinvoice-noconnect` fields from config or cmdline, or default"
+    },
+    "accept-htlc-tlv-types": {
+      "type": "string",
+      "description": "`accept-extra-tlvs-type` fields from config or cmdline, or not present"
     },
     "tor-service-password": {
       "type": "string",

doc/undoc-flags.json

@@ -1,6 +1,5 @@
 {
     "flags": [
-        "experimental-accept-extra-tlv-types",
         "channel-fee-max-base-msat",
         "channel-fee-max-proportional-thousandths",
         "funder-fund-probability",

lightningd/options.c

@@ -171,11 +171,10 @@ static char *fmt_force_feerates(const tal_t *ctx, const u32 *force_feerates)
 	return ret;
 }
 
-#if EXPERIMENTAL_FEATURES
 static char *opt_set_accept_extra_tlv_types(const char *arg,
-					     struct lightningd *ld)
+					    struct lightningd *ld)
 {
-	char *endp, **elements = tal_strsplit(NULL, arg, ",", STR_NO_EMPTY);;
+	char *endp, **elements = tal_strsplit(NULL, arg, ",", STR_NO_EMPTY);
 	unsigned long long l;
 	u64 u;
 	for (int i = 0; elements[i] != NULL; i++) {
@@ -193,7 +192,6 @@ static char *opt_set_accept_extra_tlv_types(const char *arg,
 	tal_free(elements);
 	return NULL;
 }
-#endif
 
 /* Returns the number of wireaddr types already announced */
 static size_t num_announced_types(enum wire_addr_type type, struct lightningd *ld)
@@ -1182,11 +1180,9 @@ static void register_opts(struct lightningd *ld)
 			 &ld->tor_service_password,
 			 "Set a Tor hidden service password");
 
-#if EXPERIMENTAL_FEATURES
-	opt_register_arg("--experimental-accept-extra-tlv-types",
+	opt_register_arg("--accept-htlc-tlv-types",
 			 opt_set_accept_extra_tlv_types, NULL, ld,
-			 "Comma separated list of extra TLV types to accept.");
-#endif
+			 "Comma separated list of extra HTLC TLV types to accept.");
 
 	opt_register_early_noarg("--disable-dns", opt_set_invbool, &ld->config.use_dns,
 				 "Disable DNS lookups of peers");
@@ -1509,7 +1505,7 @@ static void add_config(struct lightningd *ld,
 		       const char *name, size_t len)
 {
 	char *name0 = tal_strndup(tmpctx, name, len);
-	const char *answer = NULL;
+	char *answer = NULL;
 	char buf[OPT_SHOW_LEN + sizeof("...")];
 
 #if DEVELOPER
@@ -1605,7 +1601,7 @@ static void add_config(struct lightningd *ld,
 			if (ld->rgb)
 				answer = tal_hexstr(name0, ld->rgb, 3);
 		} else if (opt->cb_arg == (void *)opt_set_alias) {
-			answer = (const char *)ld->alias;
+			answer = (char *)ld->alias;
 		} else if (opt->cb_arg == (void *)arg_log_to_file) {
 			if (ld->logfiles)
 				json_add_opt_log_to_files(response, name0, ld->logfiles);
@@ -1668,10 +1664,17 @@ static void add_config(struct lightningd *ld,
 					fmt_amount_msat(tmpctx,
 							*(struct amount_msat *)
 							opt->u.carg));
-#if EXPERIMENTAL_FEATURES
 		} else if (opt->cb_arg == (void *)opt_set_accept_extra_tlv_types) {
-                        /* TODO Actually print the option */
-#endif
+			for (size_t i = 0;
+			     i < tal_count(ld->accept_extra_tlv_types);
+			     i++) {
+				if (i == 0)
+					answer = tal_fmt(name0, "%"PRIu64,
+							 ld->accept_extra_tlv_types[i]);
+				else
+					tal_append_fmt(&answer, ",%"PRIu64,
+						       ld->accept_extra_tlv_types[i]);
+			}
 #if DEVELOPER
 		} else if (strstarts(name, "dev-")) {
 			/* Ignore dev settings */

tests/test_pay.py

@@ -3568,7 +3568,6 @@ def test_keysend(node_factory):
         l3.rpc.keysend(l4.info['id'], amt)
 
 
-@unittest.skipIf(not EXPERIMENTAL_FEATURES, "Requires experimental-accept-extra-tlv-types option")
 def test_keysend_extra_tlvs(node_factory):
     """Use the extratlvs option to deliver a message with sphinx' TLV type.
     """
@@ -3577,14 +3576,21 @@ def test_keysend_extra_tlvs(node_factory):
         2,
         wait_for_announce=True,
         opts=[
-            {},
             {
-                'experimental-accept-extra-tlv-types': '133773310',
+                # Not needed, just for listconfigs test.
+                'accept-htlc-tlv-types': '133773310,99990',
+            },
+            {
+                'accept-htlc-tlv-types': '133773310',
                 "plugin": os.path.join(os.path.dirname(__file__), "plugins/sphinx-receiver.py"),
             },
         ]
     )
 
+    # Make sure listconfigs works here
+    assert l1.rpc.listconfigs()['accept-htlc-tlv-types'] == '133773310,99990'
+    assert l2.rpc.listconfigs()['accept-htlc-tlv-types'] == '133773310'
+
     l1.rpc.keysend(l2.info['id'], amt, extratlvs={133773310: 'FEEDC0DE'})
     inv = only_one(l2.rpc.listinvoices()['invoices'])
     assert(l2.daemon.is_in_log(r'plugin-sphinx-receiver.py.*extratlvs.*133773310.*feedc0de'))