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invoice: force inclusion of min_final_cltv_expiry for compatibility

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As reported by @wtogami, LND nodes are using a default
min_final_cltv_expiry_delta of 9, which makes them unable to pay invoices
using the modern spec default of 18.  Forcing inclusion of the c field
allows interoperability until broader support of the 18 block default.
Fixes: #6956

Changelog-Fixed: Default bolt11 invoices are payable by LND nodes.
This commit is contained in:
Alex Myers 2023-12-19 14:40:49 -06:00 committed by Christian Decker
parent 8067814171
commit 294f8dbbe5
2 changed files with 5 additions and 3 deletions
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4
common/bolt11.c
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@ -1327,7 +1327,9 @@ char *bolt11_encode_(const tal_t *ctx,
* - if the `c` field (`min_final_cltv_expiry_delta`) is not provided:
* - MUST use an expiry delta of at least 18 when making the payment
*/
if (b11->min_final_cltv_expiry != 18)
/* FIXME: Only encode if non-default once all implementations update
* default min_final_cltv_expiry_delta to 18. Forcing inclusion in the
* interrim to ensure compatibility with existing nodes. */
encode_c(&data, b11->min_final_cltv_expiry);
for (size_t i = 0; i < tal_count(b11->fallbacks); i++)

2
common/test/run-bolt11.c
View File

@ -494,11 +494,11 @@ int main(int argc, char *argv[])
badstr = bolt11_encode(tmpctx, b11, false, test_sign, NULL);
assert(streq(badstr, "lnbc25m1pvjluezpp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqdq5vdhkven9v5sxyetpdeessp5zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zygs9q4psqqqqqqqqqqqqqqqqsgqtqyx5vggfcsll4wu246hz02kp85x4katwsk9639we5n5yngc3yhqkm35jnjw4len8vrnqnf5ejh0mzj9n3vz2px97evektfm2l6wqccp3y7372"));
dev_bolt11_old_order = false;
dev_bolt11_omit_c_value = false;
/* Otherwise it does it normally */
badstr = bolt11_encode(tmpctx, b11, false, test_sign, NULL);
assert(streq(badstr, "lnbc25m1pvjluezsp5zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zyg3zygspp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqdq5vdhkven9v5sxyetpdees9q4psqqqqqqqqqqqqqqqqsgq8w9mkdh2n9pmrsg5natjffcgjpp5caamstsq5pm03v2c7ca5ej3plyrfe3vyzl76v6wex4r8rd6rdvys4a35983n6wrzegcwfl2gl4qqxh98vj"));
dev_bolt11_omit_c_value = false;
/* Empty set of allowed bits, ensures this fails! */
fset = tal(tmpctx, struct feature_set);