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plugins: expose onion_message hook (EXPERIMENTAL_FEATURES)

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-04-01 14:23:22 +10:30
parent 8b8cbb9397
commit 23a36ac8c8
1 changed files with 67 additions and 7 deletions
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74
lightningd/onion_message.c
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@ -4,9 +4,59 @@
#include <lightningd/lightningd.h>
#include <lightningd/onion_message.h>
#include <lightningd/peer_control.h>
#include <lightningd/plugin_hook.h>
#include <lightningd/subd.h>
#if EXPERIMENTAL_FEATURES
struct onion_message_hook_payload {
/* Optional */
struct pubkey *reply_blinding;
struct onionmsg_path **reply_path;
/* FIXME: Include other TLV fields here! */
};
static void
onion_message_serialize(struct onion_message_hook_payload *payload,
struct json_stream *stream)
{
json_object_start(stream, "onion_message");
if (payload->reply_path) {
json_array_start(stream, "reply_path");
for (size_t i = 0; i < tal_count(payload->reply_path); i++) {
json_object_start(stream, NULL);
json_add_pubkey(stream, "id",
&payload->reply_path[i]->node_id);
if (payload->reply_path[i]->enctlv)
json_add_hex_talarr(stream, "enctlv",
payload->reply_path[i]->enctlv);
if (i == 0)
json_add_pubkey(stream, "blinding",
payload->reply_blinding);
json_object_end(stream);
}
json_array_end(stream);
}
json_object_end(stream);
}
static void
onion_message_hook_cb(struct onion_message_hook_payload *payload,
const char *buffer,
const jsmntok_t *toks)
{
/* The core infra checks the "result"; anything other than continue
* just stops. */
tal_free(payload);
}
REGISTER_PLUGIN_HOOK(onion_message,
PLUGIN_HOOK_CHAIN,
onion_message_hook_cb,
struct onion_message_hook_payload *,
onion_message_serialize,
struct onion_message_hook_payload *);
/* Returns false if we can't tell it */
static bool make_peer_send(struct lightningd *ld,
struct channel *dst, const u8 *msg TAKES)
@ -40,19 +90,29 @@ static bool make_peer_send(struct lightningd *ld,
void handle_onionmsg_to_us(struct channel *channel, const u8 *msg)
{
struct pubkey *reply_blinding;
struct onionmsg_path **reply_path;
struct lightningd *ld = channel->peer->ld;
struct onion_message_hook_payload *payload;
if (!fromwire_got_onionmsg_to_us(msg, msg,
&reply_blinding, &reply_path)) {
payload = tal(ld, struct onion_message_hook_payload);
if (!fromwire_got_onionmsg_to_us(payload, msg,
&payload->reply_blinding,
&payload->reply_path)) {
channel_internal_error(channel, "bad got_onionmsg_tous: %s",
tal_hex(tmpctx, msg));
return;
}
log_info(channel->log, "Got onionmsg%s%s",
reply_blinding ? " reply_blinding": "",
reply_path ? " reply_path": "");
if (payload->reply_path && !payload->reply_blinding) {
log_broken(channel->log,
"No reply blinding, ignoring reply path");
payload->reply_path = tal_free(payload->reply_path);
}
log_debug(channel->log, "Got onionmsg%s%s",
payload->reply_blinding ? " reply_blinding": "",
payload->reply_path ? " reply_path": "");
plugin_hook_call_onion_message(ld, payload, payload);
}
void handle_onionmsg_forward(struct channel *channel, const u8 *msg)