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plugins/offers: allow reversal of a single-element path for reply.

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Don't refuse, this will happen if we are the head of the blinded path,
for example.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2024-07-17 18:29:11 +09:30
parent 47c1ca8d85
commit e8b959ac77
1 changed files with 5 additions and 5 deletions
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10
plugins/fetchinvoice.c
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@ -417,12 +417,15 @@ static struct blinded_path *make_reply_path(const tal_t *ctx,
{
struct pubkey *ids;
assert(tal_count(path) > 1);
assert(tal_count(path) > 0);
randombytes_buf(reply_secret, sizeof(struct secret));
if (sent->dev_reply_path) {
ids = sent->dev_reply_path;
} else if (tal_count(path) == 1) {
/* Talking to ourselves? Reverse is the same */
ids = tal_dup_talarr(tmpctx, struct pubkey, path);
} else {
size_t nhops = tal_count(path), start;
struct node_id second_last;
@ -487,10 +490,7 @@ static struct command_result *establish_path_done(struct command *cmd,
/* Create transient secret so we can validate reply! */
sent->reply_secret = tal(sent, struct secret);
/* FIXME: Maybe we should allow this? */
if (tal_count(path) == 1)
return command_fail(cmd, PAY_ROUTE_NOT_FOUND,
"Refusing to talk to ourselves");
assert(tal_count(path) > 0);
/* Add reply path to final_tlv (it already contains invoice_request/invoice) */
final_tlv->reply_path = make_reply_path(final_tlv, cmd->plugin, sent, path, sent->reply_secret);