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keysend: Check that the destination supports keysend upon init

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We were blindly initiating the keysend payment, which could lead to
confusing outcomes. This adds a very specific error message to the
error returned.

Changelog-Fixed: keysend: Keysend now checks whether the destination supports keysend before attempting a payment. If not a more informative error is returned.
This commit is contained in:
Christian Decker
2020-11-30 15:04:24 +01:00
parent 1ca2c66c54
commit 3b599b846e
2 changed files with 20 additions and 1 deletions
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19
plugins/keysend.c
View File

@@ -1,6 +1,7 @@
#include <bitcoin/preimage.h>
#include <ccan/array_size/array_size.h>
#include <ccan/tal/str/str.h>
#include <common/gossmap.h>
#include <plugins/libplugin-pay.h>
#include <plugins/libplugin.h>
#include <wire/onion_wire.h>
@@ -54,6 +55,24 @@ static struct keysend_data *keysend_init(struct payment *p)
static void keysend_cb(struct keysend_data *d, struct payment *p) {
struct createonion_hop *last_payload;
size_t hopcount;
struct gossmap_node *node;
bool enabled;
const struct gossmap *gossmap = get_gossmap(p->plugin);
/* On the root payment we perform the featurebit check. */
if (p->parent == NULL && p->step == PAYMENT_STEP_INITIALIZED) {
node = gossmap_find_node(gossmap, p->destination);
enabled = gossmap_node_get_feature(gossmap, node,
KEYSEND_FEATUREBIT) != -1;
if (!enabled)
return payment_fail(
p,
"Recipient %s does not support keysend payments "
"(feature bit %d missing in node announcement)",
node_id_to_hexstr(tmpctx, p->destination),
KEYSEND_FEATUREBIT);
}
if (p->step != PAYMENT_STEP_ONION_PAYLOAD)
return payment_continue(p);