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peer_control.c
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#include "config.h"
#include <arpa/inet.h>
#include <bitcoin/feerate.h>
#include <bitcoin/script.h>
#include <bitcoin/tx.h>
#include <ccan/array_size/array_size.h>
#include <ccan/asort/asort.h>
#include <ccan/cast/cast.h>
#include <ccan/io/io.h>
#include <ccan/mem/mem.h>
#include <ccan/noerr/noerr.h>
#include <ccan/str/str.h>
#include <ccan/take/take.h>
#include <ccan/tal/str/str.h>
#include <channeld/channeld_wiregen.h>
#include <common/addr.h>
#include <common/closing_fee.h>
#include <common/configdir.h>
#include <common/dev_disconnect.h>
#include <common/features.h>
#include <common/htlc_trim.h>
#include <common/initial_commit_tx.h>
#include <common/json_channel_type.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/jsonrpc_errors.h>
#include <common/key_derive.h>
#include <common/scb_wiregen.h>
#include <common/shutdown_scriptpubkey.h>
#include <common/status.h>
#include <common/timeout.h>
#include <common/utils.h>
#include <common/version.h>
#include <common/wire_error.h>
#include <connectd/connectd_wiregen.h>
#include <errno.h>
#include <fcntl.h>
#include <gossipd/gossipd_wiregen.h>
#include <hsmd/hsmd_wiregen.h>
#include <inttypes.h>
#include <lightningd/anchorspend.h>
#include <lightningd/bitcoind.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel.h>
#include <lightningd/channel_control.h>
#include <lightningd/channel_gossip.h>
#include <lightningd/closing_control.h>
#include <lightningd/connect_control.h>
#include <lightningd/dual_open_control.h>
#include <lightningd/gossip_control.h>
#include <lightningd/hsm_control.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/memdump.h>
#include <lightningd/notification.h>
#include <lightningd/onchain_control.h>
#include <lightningd/opening_common.h>
#include <lightningd/opening_control.h>
#include <lightningd/options.h>
#include <lightningd/peer_control.h>
#include <lightningd/peer_fd.h>
#include <lightningd/peer_htlcs.h>
#include <lightningd/plugin_hook.h>
#include <lightningd/subd.h>
#include <limits.h>
#include <onchaind/onchaind_wiregen.h>
#include <openingd/dualopend_wiregen.h>
#include <openingd/openingd_wiregen.h>
#include <stdlib.h>
#include <unistd.h>
#include <wally_bip32.h>
#include <wire/onion_wire.h>
#include <wire/wire_sync.h>
static void destroy_peer(struct peer *peer)
{
peer_node_id_map_del(peer->ld->peers, peer);
if (peer->dbid)
peer_dbid_map_del(peer->ld->peers_by_dbid, peer);
}
void peer_set_dbid(struct peer *peer, u64 dbid)
{
assert(!peer->dbid);
assert(dbid);
peer->dbid = dbid;
peer_dbid_map_add(peer->ld->peers_by_dbid, peer);
}
struct peer *new_peer(struct lightningd *ld, u64 dbid,
const struct node_id *id,
const struct wireaddr_internal *addr,
const u8 *their_features,
bool connected_incoming)
{
/* We are owned by our channels, and freed manually by destroy_channel */
struct peer *peer = tal(NULL, struct peer);
peer->ld = ld;
peer->dbid = dbid;
peer->id = *id;
peer->uncommitted_channel = NULL;
peer->addr = *addr;
peer->connected_incoming = connected_incoming;
peer->remote_addr = NULL;
list_head_init(&peer->channels);
peer->direction = node_id_idx(&peer->ld->our_nodeid, &peer->id);
peer->connected = PEER_DISCONNECTED;
peer->last_connect_attempt.ts.tv_sec
= peer->last_connect_attempt.ts.tv_nsec = 0;
if (their_features)
peer->their_features = tal_dup_talarr(peer, u8, their_features);
else
peer->their_features = NULL;
peer->dev_ignore_htlcs = false;
peer_node_id_map_add(ld->peers, peer);
if (dbid)
peer_dbid_map_add(ld->peers_by_dbid, peer);
tal_add_destructor(peer, destroy_peer);
return peer;
}
static void delete_peer(struct peer *peer)
{
assert(list_empty(&peer->channels));
assert(!peer->uncommitted_channel);
/* If it only ever existed because of uncommitted channel, it won't
* be in the database */
if (peer->dbid != 0)
wallet_delete_peer_if_unused(peer->ld->wallet, peer->dbid);
tal_free(peer);
}
/* Last one out deletes peer. */
void maybe_delete_peer(struct peer *peer)
{
if (!list_empty(&peer->channels))
return;
if (peer->uncommitted_channel) {
/* This isn't sufficient to keep it in db! */
if (peer->dbid != 0) {
wallet_delete_peer_if_unused(peer->ld->wallet, peer->dbid);
peer_dbid_map_del(peer->ld->peers_by_dbid, peer);
peer->dbid = 0;
}
return;
}
/* Maybe it's reconnected / reconnecting? */
if (peer->connected != PEER_DISCONNECTED)
return;
delete_peer(peer);
}
static void peer_channels_cleanup(struct lightningd *ld,
const struct node_id *id)
{
struct peer *peer;
struct channel *c, **channels;
peer = peer_by_id(ld, id);
if (!peer)
return;
/* Freeing channels can free peer, so gather first. */
channels = tal_arr(tmpctx, struct channel *, 0);
list_for_each(&peer->channels, c, list)
tal_arr_expand(&channels, c);
if (peer->uncommitted_channel) {
/* Frees peer if no channels */
kill_uncommitted_channel(peer->uncommitted_channel,
"Disconnected");
} else if (tal_count(channels) == 0)
/* Was completely idle. */
tal_free(peer);
for (size_t i = 0; i < tal_count(channels); i++) {
c = channels[i];
if (channel_state_wants_peercomms(c->state)) {
channel_cleanup_commands(c, "Disconnected");
channel_fail_transient(c, true, "Disconnected");
} else if (channel_state_uncommitted(c->state)) {
channel_unsaved_close_conn(c, "Disconnected");
}
}
}
struct peer *find_peer_by_dbid(struct lightningd *ld, u64 dbid)
{
return peer_dbid_map_get(ld->peers_by_dbid, dbid);
}
struct peer *peer_by_id(struct lightningd *ld, const struct node_id *id)
{
return peer_node_id_map_get(ld->peers, id);
}
struct peer *peer_from_json(struct lightningd *ld,
const char *buffer,
const jsmntok_t *peeridtok)
{
struct node_id peerid;
if (!json_to_node_id(buffer, peeridtok, &peerid))
return NULL;
return peer_by_id(ld, &peerid);
}
u8 *p2wpkh_for_keyidx(const tal_t *ctx, struct lightningd *ld, u64 keyidx)
{
struct pubkey shutdownkey;
bip32_pubkey(ld, &shutdownkey, keyidx);
return scriptpubkey_p2wpkh(ctx, &shutdownkey);
}
u8 *p2tr_for_keyidx(const tal_t *ctx, struct lightningd *ld, u64 keyidx)
{
struct pubkey shutdownkey;
bip32_pubkey(ld, &shutdownkey, keyidx);
return scriptpubkey_p2tr(ctx, &shutdownkey);
}
static struct bitcoin_tx *sign_last_tx(const tal_t *ctx,
const struct channel *channel,
const struct bitcoin_tx *last_tx,
const struct bitcoin_signature *last_sig)
{
struct lightningd *ld = channel->peer->ld;
struct bitcoin_signature sig;
const u8 *msg;
u8 **witness;
u64 commit_index = channel->next_index[LOCAL] - 1;
struct bitcoin_tx *tx = clone_bitcoin_tx(ctx, last_tx);
assert(!tx->wtx->inputs[0].witness);
msg = towire_hsmd_sign_commitment_tx(NULL,
&channel->peer->id,
channel->dbid,
tx,
&channel->channel_info
.remote_fundingkey,
commit_index);
msg = hsm_sync_req(tmpctx, ld, take(msg));
if (!fromwire_hsmd_sign_commitment_tx_reply(msg, &sig))
fatal("HSM gave bad sign_commitment_tx_reply %s",
tal_hex(tmpctx, msg));
witness =
bitcoin_witness_2of2(tx, last_sig,
&sig, &channel->channel_info.remote_fundingkey,
&channel->local_funding_pubkey);
bitcoin_tx_input_set_witness(tx, 0, take(witness));
return tx;
}
bool invalid_last_tx(const struct bitcoin_tx *tx)
{
/* This problem goes back further, but was discovered just before the
* 0.7.1 release. */
#ifdef COMPAT_V070
/* Old bug had commitment txs with no outputs; bitcoin_txid asserts. */
return !tx || !tx->wtx || tx->wtx->num_outputs == 0;
#else
return false;
#endif
}
static bool commit_tx_send_finished(struct channel *channel,
const struct bitcoin_tx *tx,
bool success,
const char *err,
struct anchor_details *adet)
{
struct bitcoin_txid txid;
bitcoin_txid(tx, &txid);
/* If it's already mined, stop retransmitting, stop boosting. */
if (wallet_transaction_height(channel->peer->ld->wallet, &txid) != 0) {
tal_free(adet);
return true;
}
/* Boost (if possible), and keep trying! */
commit_tx_boost(channel, adet, success);
return false;
}
static struct bitcoin_tx *sign_and_send_last(const tal_t *ctx,
struct lightningd *ld,
struct channel *channel,
const char *cmd_id,
const struct bitcoin_tx *last_tx,
const struct bitcoin_signature *last_sig)
{
struct bitcoin_txid txid;
struct anchor_details *adet;
struct bitcoin_tx *tx;
tx = sign_last_tx(ctx, channel, last_tx, last_sig);
bitcoin_txid(tx, &txid);
wallet_transaction_add(ld->wallet, tx->wtx, 0, 0);
wallet_extract_owned_outputs(ld->wallet, tx->wtx, false, NULL, NULL);
/* Remember anchor information for commit_tx_boost */
adet = create_anchor_details(NULL, channel, tx);
/* Keep broadcasting until we say stop (can fail due to dup,
* if they beat us to the broadcast). */
broadcast_tx(channel, ld->topology, channel, tx, cmd_id, false, 0,
commit_tx_send_finished, NULL, take(adet));
return tx;
}
/* FIXME: reorder! */
static enum watch_result funding_spent(struct channel *channel,
const struct bitcoin_tx *tx,
size_t inputnum UNUSED,
const struct block *block);
/* We coop-closed channel: if another inflight confirms, force close */
static enum watch_result closed_inflight_depth_cb(struct lightningd *ld,
const struct bitcoin_txid *txid,
const struct bitcoin_tx *tx,
unsigned int depth,
struct channel_inflight *inflight)
{
if (depth == 0)
return KEEP_WATCHING;
/* This is now the main tx. */
update_channel_from_inflight(ld, inflight->channel, inflight);
channel_fail_permanent(inflight->channel,
REASON_UNKNOWN,
"Inflight tx %s confirmed after mutual close",
fmt_bitcoin_txid(tmpctx, txid));
return DELETE_WATCH;
}
void drop_to_chain(struct lightningd *ld, struct channel *channel,
bool cooperative, bool rebroadcast)
{
struct channel_inflight *inflight;
const char *cmd_id;
/* If we're not already (e.g. close before channel fully open),
* make sure we're watching for the funding spend */
if (!channel->funding_spend_watch) {
log_debug(channel->log, "Adding funding_spend_watch");
channel->funding_spend_watch = watch_txo(channel,
ld->topology, channel,
&channel->funding,
funding_spent);
}
/* If this was triggered by a close command, get a copy of the cmd id */
cmd_id = cmd_id_from_close_command(tmpctx, ld, channel);
/* BOLT #2:
*
* - if `next_revocation_number` is greater than expected
* above, AND `your_last_per_commitment_secret` is correct for that
* `next_revocation_number` minus 1:
* - MUST NOT broadcast its commitment transaction.
*/
if (channel->has_future_per_commitment_point && !cooperative) {
log_broken(channel->log,
"Cannot broadcast our commitment tx:"
" they have a future one");
} else if (channel_state_open_uncommitted(channel->state)) {
/* There's no commitment transaction, we can
* safely forget this channel */
log_info(channel->log,
"Initialized channel (v2) received error"
", we're deleting the channel");
} else if (invalid_last_tx(channel->last_tx)) {
log_broken(channel->log,
"Cannot broadcast our commitment tx:"
" it's invalid! (ancient channel?)");
} else if (!rebroadcast && !cooperative) {
log_unusual(channel->log,
"Not dropping our unilateral close onchain since "
"we already saw theirs confirm.");
} else {
struct bitcoin_tx *tx COMPILER_WANTS_INIT("gcc 12.3.0");
/* We need to drop *every* commitment transaction to chain */
if (!cooperative && !list_empty(&channel->inflights)) {
list_for_each(&channel->inflights, inflight, list) {
if (!inflight->last_tx)
continue;
tx = sign_and_send_last(tmpctx, ld, channel, cmd_id,
inflight->last_tx,
&inflight->last_sig);
}
} else
tx = sign_and_send_last(tmpctx, ld, channel, cmd_id, channel->last_tx,
&channel->last_sig);
resolve_close_command(ld, channel, cooperative, tx);
}
/* In cooperative mode, we're assuming that we closed the right one:
* this might not happen if we're splicing, or dual-funding still
* opening. So, if we get any unexpected inflight confirming, we
* force close. */
if (cooperative) {
list_for_each(&channel->inflights, inflight, list) {
if (bitcoin_outpoint_eq(&inflight->funding->outpoint,
&channel->funding)) {
continue;
}
watch_txid(inflight, ld->topology,
&inflight->funding->outpoint.txid,
closed_inflight_depth_cb, inflight);
}
}
}
void resend_closing_transactions(struct lightningd *ld)
{
struct peer *peer;
struct channel *channel;
struct peer_node_id_map_iter it;
for (peer = peer_node_id_map_first(ld->peers, &it);
peer;
peer = peer_node_id_map_next(ld->peers, &it)) {
list_for_each(&peer->channels, channel, list) {
switch (channel->state) {
case CHANNELD_AWAITING_LOCKIN:
case CHANNELD_NORMAL:
case DUALOPEND_OPEN_INIT:
case DUALOPEND_OPEN_COMMIT_READY:
case DUALOPEND_OPEN_COMMITTED:
case DUALOPEND_AWAITING_LOCKIN:
case CHANNELD_AWAITING_SPLICE:
case CHANNELD_SHUTTING_DOWN:
case CLOSINGD_SIGEXCHANGE:
case FUNDING_SPEND_SEEN:
case ONCHAIN:
case CLOSED:
continue;
case CLOSINGD_COMPLETE:
drop_to_chain(ld, channel, true, true);
continue;
case AWAITING_UNILATERAL:
drop_to_chain(ld, channel, false, true);
continue;
}
abort();
}
}
}
void channel_errmsg(struct channel *channel,
struct peer_fd *peer_fd,
const char *desc,
const u8 *err_for_them,
bool disconnect,
bool warning)
{
/* Clean up any in-progress open attempts */
channel_cleanup_commands(channel, desc);
if (channel_state_uncommitted(channel->state)) {
log_info(channel->log, "%s", "Unsaved peer failed."
" Deleting channel.");
delete_channel(channel);
return;
}
/* No peer_fd means a subd crash or disconnection. */
if (!peer_fd) {
/* If the channel is unsaved, we forget it */
channel_fail_transient(channel, disconnect, "%s: %s",
channel->owner->name, desc);
return;
}
/* Do we have an error to send? */
if (err_for_them && !channel->error && !warning)
channel->error = tal_dup_talarr(channel, u8, err_for_them);
/* LND sends "internal error" and we close the channel. But
* prior to 0.11 we would turn this into a warning, and they
* would recover after a reconnect. So we downgrade, but snark
* about it in the logs. */
if (!err_for_them && strends(desc, "internal error")) {
channel_fail_transient(channel, disconnect, "%s: %s",
channel->owner->name,
"lnd sent 'internal error':"
" let's give it some space");
return;
}
/* This is us, sending a warning. */
if (warning) {
channel_fail_transient(channel, disconnect, "%s sent %s",
channel->owner->name,
desc);
return;
}
/* BOLT #1:
*
* A sending node:
*...
* - when sending `error`:
* - MUST fail the channel(s) referred to by the error message.
* - MAY set `channel_id` to all zero to indicate all channels.
*/
/* FIXME: Close if it's an all-channels error sent or rcvd */
/* BOLT #1:
*
* A sending node:
*...
* - when sending `error`:
* - MUST fail the channel(s) referred to by the error message.
* - MAY set `channel_id` to all zero to indicate all channels.
*...
* The receiving node:
* - upon receiving `error`:
* - if `channel_id` is all zero:
* - MUST fail all channels with the sending node.
* - otherwise:
* - MUST fail the channel referred to by `channel_id`, if that channel is with the
* sending node.
*/
/* FIXME: We don't close all channels */
/* We should immediately forget the channel if we receive error during
* CHANNELD_AWAITING_LOCKIN if we are fundee. */
if (!err_for_them && channel->opener == REMOTE
&& channel->state == CHANNELD_AWAITING_LOCKIN)
channel_fail_forget(channel, "%s: %s %s",
channel->owner->name,
err_for_them ? "sent" : "received", desc);
else
channel_fail_permanent(channel,
err_for_them ? REASON_LOCAL : REASON_PROTOCOL,
"%s: %s %s",
channel->owner->name,
err_for_them ? "sent" : "received", desc);
}
static void json_add_htlcs(struct lightningd *ld,
struct json_stream *response,
const struct channel *channel)
{
/* FIXME: make per-channel htlc maps! */
const struct htlc_in *hin;
struct htlc_in_map_iter ini;
const struct htlc_out *hout;
struct htlc_out_map_iter outi;
u32 local_feerate = get_feerate(channel->fee_states,
channel->opener, LOCAL);
/* FIXME: Add more fields. */
json_array_start(response, "htlcs");
for (hin = htlc_in_map_first(ld->htlcs_in, &ini);
hin;
hin = htlc_in_map_next(ld->htlcs_in, &ini)) {
if (hin->key.channel != channel)
continue;
json_object_start(response, NULL);
json_add_string(response, "direction", "in");
json_add_u64(response, "id", hin->key.id);
json_add_amount_msat(response, "amount_msat", hin->msat);
json_add_u32(response, "expiry", hin->cltv_expiry);
json_add_sha256(response, "payment_hash", &hin->payment_hash);
json_add_string(response, "state",
htlc_state_name(hin->hstate));
if (htlc_is_trimmed(REMOTE, hin->msat, local_feerate,
channel->our_config.dust_limit, LOCAL,
channel_has(channel, OPT_ANCHOR_OUTPUTS_DEPRECATED),
channel_has(channel, OPT_ANCHORS_ZERO_FEE_HTLC_TX)))
json_add_bool(response, "local_trimmed", true);
if (hin->status != NULL)
json_add_string(response, "status", hin->status);
json_object_end(response);
}
for (hout = htlc_out_map_first(ld->htlcs_out, &outi);
hout;
hout = htlc_out_map_next(ld->htlcs_out, &outi)) {
if (hout->key.channel != channel)
continue;
json_object_start(response, NULL);
json_add_string(response, "direction", "out");
json_add_u64(response, "id", hout->key.id);
json_add_amount_msat(response, "amount_msat", hout->msat);
json_add_u64(response, "expiry", hout->cltv_expiry);
json_add_sha256(response, "payment_hash", &hout->payment_hash);
json_add_string(response, "state",
htlc_state_name(hout->hstate));
if (htlc_is_trimmed(LOCAL, hout->msat, local_feerate,
channel->our_config.dust_limit, LOCAL,
channel_has(channel, OPT_ANCHOR_OUTPUTS_DEPRECATED),
channel_has(channel, OPT_ANCHORS_ZERO_FEE_HTLC_TX)))
json_add_bool(response, "local_trimmed", true);
json_object_end(response);
}
json_array_end(response);
}
/* Fee a commitment transaction would currently cost */
static struct amount_sat commit_txfee(const struct channel *channel,
struct amount_msat amount,
enum side side)
{
/* FIXME: make per-channel htlc maps! */
const struct htlc_in *hin;
struct htlc_in_map_iter ini;
const struct htlc_out *hout;
struct htlc_out_map_iter outi;
struct lightningd *ld = channel->peer->ld;
size_t num_untrimmed_htlcs = 0;
u32 feerate = get_feerate(channel->fee_states,
channel->opener, side);
struct amount_sat dust_limit;
struct amount_sat fee;
bool option_anchor_outputs = channel_has(channel, OPT_ANCHOR_OUTPUTS_DEPRECATED);
bool option_anchors_zero_fee_htlc_tx = channel_has(channel, OPT_ANCHORS_ZERO_FEE_HTLC_TX);
if (side == LOCAL)
dust_limit = channel->our_config.dust_limit;
if (side == REMOTE)
dust_limit = channel->channel_info.their_config.dust_limit;
/* Assume we tried to add "amount" */
if (!htlc_is_trimmed(side, amount, feerate, dust_limit, side,
option_anchor_outputs, option_anchors_zero_fee_htlc_tx))
num_untrimmed_htlcs++;
for (hin = htlc_in_map_first(ld->htlcs_in, &ini);
hin;
hin = htlc_in_map_next(ld->htlcs_in, &ini)) {
if (hin->key.channel != channel)
continue;
if (!htlc_is_trimmed(!side, hin->msat, feerate, dust_limit,
side, option_anchor_outputs, option_anchors_zero_fee_htlc_tx))
num_untrimmed_htlcs++;
}
for (hout = htlc_out_map_first(ld->htlcs_out, &outi);
hout;
hout = htlc_out_map_next(ld->htlcs_out, &outi)) {
if (hout->key.channel != channel)
continue;
if (!htlc_is_trimmed(side, hout->msat, feerate, dust_limit,
side, option_anchor_outputs, option_anchors_zero_fee_htlc_tx))
num_untrimmed_htlcs++;
}
/*
* BOLT #2:
* A sending node:
*...
* - SHOULD NOT offer `amount_msat` if, after adding that HTLC to its
* commitment transaction, its remaining balance doesn't allow it to
* pay the commitment transaction fee when receiving or sending a
* future additional non-dust HTLC while maintaining its channel
* reserve. It is recommended that this "fee spike buffer" can
* handle twice the current `feerate_per_kw` to ensure
* predictability between implementations.
*/
fee = commit_tx_base_fee(marginal_feerate(feerate), num_untrimmed_htlcs + 1,
option_anchor_outputs, option_anchors_zero_fee_htlc_tx);
if (option_anchor_outputs || option_anchors_zero_fee_htlc_tx) {
/* BOLT #3:
* If `option_anchors` applies to the commitment
* transaction, also subtract two times the fixed anchor size
* of 330 sats from the funder (either `to_local` or
* `to_remote`).
*/
if (!amount_sat_add(&fee, fee, AMOUNT_SAT(660)))
; /* fee is somehow astronomical already.... */
}
return fee;
}
static void subtract_offered_htlcs(const struct channel *channel,
struct amount_msat *amount)
{
const struct htlc_out *hout;
struct htlc_out_map_iter outi;
struct lightningd *ld = channel->peer->ld;
for (hout = htlc_out_map_first(ld->htlcs_out, &outi);
hout;
hout = htlc_out_map_next(ld->htlcs_out, &outi)) {
if (hout->key.channel != channel)
continue;
if (!amount_msat_sub(amount, *amount, hout->msat))
*amount = AMOUNT_MSAT(0);
}
}
static void subtract_received_htlcs(const struct channel *channel,
struct amount_msat *amount)
{
const struct htlc_in *hin;
struct htlc_in_map_iter ini;
struct lightningd *ld = channel->peer->ld;
for (hin = htlc_in_map_first(ld->htlcs_in, &ini);
hin;
hin = htlc_in_map_next(ld->htlcs_in, &ini)) {
if (hin->key.channel != channel)
continue;
if (!amount_msat_sub(amount, *amount, hin->msat))
*amount = AMOUNT_MSAT(0);
}
}
struct amount_msat channel_amount_spendable(const struct channel *channel)
{
struct amount_msat spendable;
bool wumbo;
/* Compute how much we can send via this channel in one payment. */
if (!amount_msat_sub_sat(&spendable,
channel->our_msat,
channel->channel_info.their_config.channel_reserve))
return AMOUNT_MSAT(0);
/* Take away any currently-offered HTLCs. */
subtract_offered_htlcs(channel, &spendable);
/* If we're opener, subtract txfees we'll need to spend this */
if (channel->opener == LOCAL) {
if (!amount_msat_sub_sat(&spendable, spendable,
commit_txfee(channel, spendable,
LOCAL)))
return AMOUNT_MSAT(0);
}
/* We can't offer an HTLC less than the other side will accept. */
if (amount_msat_less(spendable,
channel->channel_info.their_config.htlc_minimum))
return AMOUNT_MSAT(0);
wumbo = feature_negotiated(channel->peer->ld->our_features,
channel->peer->their_features,
OPT_LARGE_CHANNELS);
/* We can't offer an HTLC over the max payment threshold either. */
if (amount_msat_greater(spendable, chainparams->max_payment)
&& !wumbo) {
spendable = chainparams->max_payment;
}
return spendable;
}
struct amount_msat channel_amount_receivable(const struct channel *channel)
{
struct amount_msat their_msat, receivable;
bool wumbo;
/* Compute how much we can receive via this channel in one payment */
if (!amount_sat_sub_msat(&their_msat,
channel->funding_sats, channel->our_msat))
their_msat = AMOUNT_MSAT(0);
if (!amount_msat_sub_sat(&receivable,
their_msat,
channel->our_config.channel_reserve))
return AMOUNT_MSAT(0);
/* Take away any currently-offered HTLCs. */
subtract_received_htlcs(channel, &receivable);
/* If they're opener, subtract txfees they'll need to spend this */
if (channel->opener == REMOTE) {
if (!amount_msat_sub_sat(&receivable, receivable,
commit_txfee(channel,
receivable, REMOTE)))
return AMOUNT_MSAT(0);
}
/* They can't offer an HTLC less than what we will accept. */
if (amount_msat_less(receivable, channel->our_config.htlc_minimum))
return AMOUNT_MSAT(0);
wumbo = feature_negotiated(channel->peer->ld->our_features,
channel->peer->their_features,
OPT_LARGE_CHANNELS);
/* They can't offer an HTLC over the max payment threshold either. */
if (amount_msat_greater(receivable, chainparams->max_payment)
&& !wumbo) {
receivable = chainparams->max_payment;
}
return receivable;
}
static void NON_NULL_ARGS(1, 2, 4, 5) json_add_channel(struct command *cmd,
struct json_stream *response,
const char *key,
const struct channel *channel,
const struct peer *peer)
{
struct lightningd *ld = cmd->ld;
struct amount_msat funding_msat;
struct amount_sat peer_funded_sats;
const struct peer_update *peer_update;
u32 feerate;
json_object_start(response, key);
json_add_node_id(response, "peer_id", &peer->id);
json_add_bool(response, "peer_connected", peer->connected == PEER_CONNECTED);
if (peer->connected == PEER_CONNECTED) {
json_add_bool(response, "reestablished", channel->reestablished);
}
json_add_channel_type(response, "channel_type", channel->type);
if (channel->ignore_fee_limits) {
json_add_bool(response, "ignore_fee_limits", channel->ignore_fee_limits);
}
/* This reflects current gossip */
json_object_start(response, "updates");
json_object_start(response, "local");
json_add_amount_msat(response,
"htlc_minimum_msat",
channel->htlc_minimum_msat);
json_add_amount_msat(response,
"htlc_maximum_msat",
channel->htlc_maximum_msat);
json_add_u32(response, "cltv_expiry_delta", ld->config.cltv_expiry_delta);
json_add_amount_msat(response, "fee_base_msat",
amount_msat(channel->feerate_base));
json_add_u32(response, "fee_proportional_millionths",
channel->feerate_ppm);
json_object_end(response);
peer_update = channel_gossip_get_remote_update(channel);
if (peer_update) {
json_object_start(response, "remote");
json_add_amount_msat(response,
"htlc_minimum_msat",
peer_update->htlc_minimum_msat);
json_add_amount_msat(response,
"htlc_maximum_msat",
peer_update->htlc_maximum_msat);
json_add_u32(response, "cltv_expiry_delta", peer_update->cltv_delta);
json_add_amount_msat(response, "fee_base_msat",
amount_msat(peer_update->fee_base));
json_add_u32(response, "fee_proportional_millionths",
peer_update->fee_ppm);
json_object_end(response);
}
json_object_end(response);
if (channel->last_stable_connection != 0) {
json_add_u64(response, "last_stable_connection",
channel->last_stable_connection);
}
json_add_string(response, "state", channel_state_name(channel));
if (channel->last_tx && !invalid_last_tx(channel->last_tx)) {
struct bitcoin_txid txid;
bitcoin_txid(channel->last_tx, &txid);
json_add_txid(response, "scratch_txid", &txid);
json_add_amount_sat_msat(response, "last_tx_fee_msat",
bitcoin_tx_compute_fee(channel->last_tx));
}
json_add_bool(response, "lost_state", channel->has_future_per_commitment_point);
json_object_start(response, "feerate");
feerate = get_feerate(channel->fee_states, channel->opener, LOCAL);
json_add_u32(response, feerate_style_name(FEERATE_PER_KSIPA), feerate);
json_add_u32(response, feerate_style_name(FEERATE_PER_KBYTE),
feerate_to_style(feerate, FEERATE_PER_KBYTE));
json_object_end(response);
if (channel->owner)
json_add_string(response, "owner", channel->owner->name);
if (channel->scid)
json_add_short_channel_id(response, "short_channel_id",
*channel->scid);
/* If there is any way we can use the channel we'd better have
* a direction attached. Technically we could always add it,
* as it's just the lexicographic order between node_ids, but
* why bother if we can't use it? */
if (channel->scid || channel->alias[LOCAL] || channel->alias[REMOTE])
json_add_num(response, "direction",
node_id_idx(&ld->our_nodeid, &channel->peer->id));
json_add_string(response, "channel_id",
fmt_channel_id(tmpctx, &channel->cid));
json_add_txid(response, "funding_txid", &channel->funding.txid);
json_add_num(response, "funding_outnum", channel->funding.n);
if (!list_empty(&channel->inflights)) {
struct channel_inflight *initial, *inflight;
u32 last_feerate, next_feerate;
initial = list_top(&channel->inflights,
struct channel_inflight, list);
json_add_string(response, "initial_feerate",
tal_fmt(tmpctx, "%d%s",
initial->funding->feerate,
feerate_style_name(FEERATE_PER_KSIPA)));
last_feerate = channel_last_funding_feerate(channel);
assert(last_feerate > 0);
json_add_string(response, "last_feerate",
tal_fmt(tmpctx, "%d%s", last_feerate,
feerate_style_name(FEERATE_PER_KSIPA)));
/* BOLT #2:
* - MUST set `feerate` greater than or equal to 25/24
* times the `feerate` of the previously constructed
* transaction, rounded down.
*/
next_feerate = last_feerate * 25 / 24;
assert(next_feerate > last_feerate);
json_add_string(response, "next_feerate",
tal_fmt(tmpctx, "%d%s", next_feerate,
feerate_style_name(FEERATE_PER_KSIPA)));
/* List the inflights */
json_array_start(response, "inflight");
list_for_each(&channel->inflights, inflight, list) {
struct bitcoin_txid txid;
json_object_start(response, NULL);
json_add_txid(response, "funding_txid",
&inflight->funding->outpoint.txid);
json_add_num(response, "funding_outnum",
inflight->funding->outpoint.n);
json_add_string(response, "feerate",
tal_fmt(tmpctx, "%d%s",
inflight->funding->feerate,
feerate_style_name(
FEERATE_PER_KSIPA)));
json_add_amount_sat_msat(response,
"total_funding_msat",
inflight->funding->total_funds);
json_add_amount_sat_msat(response,
"our_funding_msat",
inflight->funding->our_funds);
json_add_s64(response,
"splice_amount",
inflight->funding->splice_amnt);
/* Add the expected commitment tx id also */
if (inflight->last_tx) {
bitcoin_txid(inflight->last_tx, &txid);
json_add_txid(response, "scratch_txid", &txid);
}
json_object_end(response);
}
json_array_end(response);
}
if (channel->shutdown_scriptpubkey[LOCAL]) {
char *addr = encode_scriptpubkey_to_addr(tmpctx,
chainparams,
channel->shutdown_scriptpubkey[LOCAL]);
if (addr)
json_add_string(response, "close_to_addr", addr);
json_add_hex_talarr(response, "close_to",
channel->shutdown_scriptpubkey[LOCAL]);
}
json_add_bool(
response, "private",
!(channel->channel_flags & CHANNEL_FLAGS_ANNOUNCE_CHANNEL));
/* opener and closer */
assert(channel->opener != NUM_SIDES);
json_add_string(response, "opener", channel->opener == LOCAL ?
"local" : "remote");
if (channel->closer != NUM_SIDES)
json_add_string(response, "closer", channel->closer == LOCAL ?
"local" : "remote");
if (channel->alias[LOCAL] || channel->alias[REMOTE]) {
json_object_start(response, "alias");
if (channel->alias[LOCAL])
json_add_short_channel_id(response, "local",