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core-lightning/lightningd/closing_control.c
Rusty Russell 02e169fd27 lightningd: drive all reconnections out of disconnections. 
The only places which should call try_reconnect now are the "connect"
command, and the disconnect path when it decides there's still an
active channel.

This introduces one subtlety: if we disconnect when there's no active
channel, but then the subd makes one, we have to catch that case!

This temporarily reverts "slow" reconnections to fast ones: see next
patch.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2022-07-18 20:50:04 -05:00

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#include "config.h"
#include <bitcoin/feerate.h>
#include <bitcoin/script.h>
#include <ccan/cast/cast.h>
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <channeld/channeld_wiregen.h>
#include <closingd/closingd_wiregen.h>
#include <common/close_tx.h>
#include <common/closing_fee.h>
#include <common/configdir.h>
#include <common/fee_states.h>
#include <common/initial_commit_tx.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/shutdown_scriptpubkey.h>
#include <common/timeout.h>
#include <common/type_to_string.h>
#include <common/utils.h>
#include <connectd/connectd_wiregen.h>
#include <errno.h>
#include <gossipd/gossipd_wiregen.h>
#include <hsmd/capabilities.h>
#include <inttypes.h>
#include <lightningd/bitcoind.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel.h>
#include <lightningd/closing_control.h>
#include <lightningd/dual_open_control.h>
#include <lightningd/hsm_control.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/opening_common.h>
#include <lightningd/options.h>
#include <lightningd/peer_control.h>
#include <lightningd/peer_fd.h>
#include <lightningd/subd.h>
#include <openingd/dualopend_wiregen.h>
#include <wally_bip32.h>
struct close_command {
/* Inside struct lightningd close_commands. */
struct list_node list;
/* Command structure. This is the parent of the close command. */
struct command *cmd;
/* Channel being closed. */
struct channel *channel;
};
/* Resolve a single close command. */
static void
resolve_one_close_command(struct close_command *cc, bool cooperative)
{
struct json_stream *result = json_stream_success(cc->cmd);
json_add_tx(result, "tx", cc->channel->last_tx);
if (!invalid_last_tx(cc->channel->last_tx)) {
struct bitcoin_txid txid;
bitcoin_txid(cc->channel->last_tx, &txid);
json_add_txid(result, "txid", &txid);
}
if (cooperative)
json_add_string(result, "type", "mutual");
else
json_add_string(result, "type", "unilateral");
was_pending(command_success(cc->cmd, result));
}
/* Resolve a close command for a channel that will be closed soon. */
void resolve_close_command(struct lightningd *ld, struct channel *channel,
bool cooperative)
{
struct close_command *cc;
struct close_command *n;
list_for_each_safe(&ld->close_commands, cc, n, list) {
if (cc->channel != channel)
continue;
resolve_one_close_command(cc, cooperative);
}
}
/* Destroy the close command structure in reaction to the
* channel being destroyed. */
static void
destroy_close_command_on_channel_destroy(struct channel *_ UNUSED,
struct close_command *cc)
{
/* The cc has the command as parent, so resolving the
* command destroys the cc and triggers destroy_close_command.
* Clear the cc->channel first so that we will not try to
* remove a destructor. */
cc->channel = NULL;
was_pending(command_fail(cc->cmd, LIGHTNINGD,
"Channel forgotten before proper close."));
}
/* Destroy the close command structure. */
static void
destroy_close_command(struct close_command *cc)
{
list_del(&cc->list);
/* If destroy_close_command_on_channel_destroy was
* triggered beforehand, it will have cleared
* the channel field, preventing us from removing it
* from an already-destroyed channel. */
if (!cc->channel)
return;
tal_del_destructor2(cc->channel,
&destroy_close_command_on_channel_destroy,
cc);
}
/* Handle timeout. */
static void
close_command_timeout(struct close_command *cc)
{
/* This will trigger drop_to_chain, which will trigger
* resolution of the command and destruction of the
* close_command. */
json_notify_fmt(cc->cmd, LOG_INFORM,
"Timed out, forcing close.");
channel_fail_permanent(cc->channel, REASON_USER,
"Forcibly closed by `close` command timeout");
}
/* Construct a close command structure and add to ld. */
static void
register_close_command(struct lightningd *ld,
struct command *cmd,
struct channel *channel,
unsigned int timeout)
{
struct close_command *cc;
assert(channel);
cc = tal(cmd, struct close_command);
list_add_tail(&ld->close_commands, &cc->list);
cc->cmd = cmd;
cc->channel = channel;
tal_add_destructor(cc, &destroy_close_command);
tal_add_destructor2(channel,
&destroy_close_command_on_channel_destroy,
cc);
if (!channel->owner) {
char *msg = tal_strdup(tmpctx, "peer is offline, will negotiate once they reconnect");
if (timeout)
tal_append_fmt(&msg, " (%u seconds before unilateral close)",
timeout);
json_notify_fmt(cmd, LOG_INFORM, "%s.", msg);
}
log_debug(ld->log, "close_command: timeout = %u", timeout);
if (timeout)
new_reltimer(ld->timers, cc, time_from_sec(timeout),
&close_command_timeout, cc);
}
static struct amount_sat calc_tx_fee(struct amount_sat sat_in,
const struct bitcoin_tx *tx)
{
struct amount_asset amt;
struct amount_sat fee = sat_in;
const u8 *oscript;
size_t scriptlen;
for (size_t i = 0; i < tx->wtx->num_outputs; i++) {
amt = bitcoin_tx_output_get_amount(tx, i);
oscript = bitcoin_tx_output_get_script(NULL, tx, i);
scriptlen = tal_bytelen(oscript);
tal_free(oscript);
if (chainparams->is_elements && scriptlen == 0)
continue;
/* Ignore outputs that are not denominated in our main
* currency. */
if (!amount_asset_is_main(&amt))
continue;
if (!amount_sat_sub(&fee, fee, amount_asset_to_sat(&amt)))
fatal("Tx spends more than input %s? %s",
type_to_string(tmpctx, struct amount_sat, &sat_in),
type_to_string(tmpctx, struct bitcoin_tx, tx));
}
return fee;
}
/* Assess whether a proposed closing fee is acceptable. */
static bool closing_fee_is_acceptable(struct lightningd *ld,
struct channel *channel,
const struct bitcoin_tx *tx)
{
struct amount_sat fee, last_fee, min_fee;
u64 weight;
u32 min_feerate;
bool feerate_unknown;
/* Calculate actual fee (adds in eliminated outputs) */
fee = calc_tx_fee(channel->funding_sats, tx);
last_fee = calc_tx_fee(channel->funding_sats, channel->last_tx);
/* Weight once we add in sigs. */
assert(!tx->wtx->inputs[0].witness
|| tx->wtx->inputs[0].witness->num_items == 0);
weight = bitcoin_tx_weight(tx) + bitcoin_tx_2of2_input_witness_weight();
log_debug(channel->log, "Their actual closing tx fee is %s"
" vs previous %s: weight is %"PRIu64,
type_to_string(tmpctx, struct amount_sat, &fee),
type_to_string(tmpctx, struct amount_sat, &last_fee),
weight);
/* If we don't have a feerate estimate, this gives feerate_floor */
min_feerate = feerate_min(ld, &feerate_unknown);
min_fee = amount_tx_fee(min_feerate, weight);
if (amount_sat_less(fee, min_fee)) {
log_debug(channel->log, "... That's below our min %s"
" for weight %"PRIu64" at feerate %u",
type_to_string(tmpctx, struct amount_sat, &min_fee),
weight, min_feerate);
return false;
}
/* Prefer new over old: this covers the preference
* for a mutual close over a unilateral one. */
return true;
}
static void peer_received_closing_signature(struct channel *channel,
const u8 *msg)
{
struct bitcoin_signature sig;
struct bitcoin_tx *tx;
struct bitcoin_txid tx_id;
struct lightningd *ld = channel->peer->ld;
u8 *funding_wscript;
if (!fromwire_closingd_received_signature(msg, msg, &sig, &tx)) {
channel_internal_error(channel,
"Bad closing_received_signature %s",
tal_hex(msg, msg));
return;
}
tx->chainparams = chainparams;
funding_wscript = bitcoin_redeem_2of2(tmpctx,
&channel->local_funding_pubkey,
&channel->channel_info.remote_fundingkey);
if (!check_tx_sig(tx, 0, NULL, funding_wscript,
&channel->channel_info.remote_fundingkey, &sig)) {
channel_internal_error(channel,
"Bad closing_received_signature %s",
tal_hex(msg, msg));
return;
}
if (closing_fee_is_acceptable(ld, channel, tx)) {
channel_set_last_tx(channel, tx, &sig, TX_CHANNEL_CLOSE);
wallet_channel_save(ld->wallet, channel);
}
// Send back the txid so we can update the billboard on selection.
bitcoin_txid(channel->last_tx, &tx_id);
/* OK, you can continue now. */
subd_send_msg(channel->owner,
take(towire_closingd_received_signature_reply(channel, &tx_id)));
}
static void peer_closing_complete(struct channel *channel, const u8 *msg)
{
if (!fromwire_closingd_complete(msg)) {
channel_internal_error(channel, "Bad closing_complete %s",
tal_hex(msg, msg));
return;
}
/* Don't report spurious failure when closingd exits. */
channel_set_owner(channel, NULL);
/* Clear any transient negotiation messages */
channel_set_billboard(channel, false, NULL);
/* Retransmission only, ignore closing. */
if (channel_closed(channel))
return;
/* Channel gets dropped to chain cooperatively. */
drop_to_chain(channel->peer->ld, channel, true);
channel_set_state(channel,
CLOSINGD_SIGEXCHANGE,
CLOSINGD_COMPLETE,
REASON_UNKNOWN,
"Closing complete");
}
static void peer_closing_notify(struct channel *channel, const u8 *msg)
{
char *message;
struct close_command *i;
enum log_level level;
if (!fromwire_closingd_notification(msg, msg, &level, &message)) {
channel_internal_error(channel, "Bad closing_notify %s",
tal_hex(msg, msg));
return;
}
list_for_each(&channel->peer->ld->close_commands, i, list) {
if (i->channel != channel)
continue;
json_notify_fmt(i->cmd, level, "%s", message);
}
}
static unsigned closing_msg(struct subd *sd, const u8 *msg, const int *fds UNUSED)
{
enum closingd_wire t = fromwire_peektype(msg);
switch (t) {
case WIRE_CLOSINGD_RECEIVED_SIGNATURE:
peer_received_closing_signature(sd->channel, msg);
break;
case WIRE_CLOSINGD_COMPLETE:
peer_closing_complete(sd->channel, msg);
break;
case WIRE_CLOSINGD_NOTIFICATION:
peer_closing_notify(sd->channel, msg);
break;
/* We send these, not receive them */
case WIRE_CLOSINGD_INIT:
case WIRE_CLOSINGD_RECEIVED_SIGNATURE_REPLY:
break;
}
return 0;
}
void peer_start_closingd(struct channel *channel, struct peer_fd *peer_fd)
{
u8 *initmsg;
u32 min_feerate, feerate, *max_feerate;
struct amount_msat their_msat;
struct amount_sat feelimit;
int hsmfd;
struct lightningd *ld = channel->peer->ld;
u32 final_commit_feerate;
bool option_anchor_outputs = channel_has(channel, OPT_ANCHOR_OUTPUTS);
if (!channel->shutdown_scriptpubkey[REMOTE]) {
channel_internal_error(channel,
"Can't start closing: no remote info");
return;
}
hsmfd = hsm_get_client_fd(ld, &channel->peer->id, channel->dbid,
HSM_CAP_SIGN_CLOSING_TX
| HSM_CAP_COMMITMENT_POINT);
channel_set_owner(channel,
new_channel_subd(channel, ld,
"lightning_closingd",
channel, &channel->peer->id,
channel->log, true,
closingd_wire_name, closing_msg,
channel_errmsg,
channel_set_billboard,
take(&peer_fd->fd),
take(&hsmfd),
NULL));
if (!channel->owner) {
log_broken(channel->log, "Could not subdaemon closing: %s",
strerror(errno));
/* Disconnect it. */
subd_send_msg(ld->connectd,
take(towire_connectd_discard_peer(NULL, &channel->peer->id,
channel->peer->connectd_counter)));
return;
}
/* FIXME: This is the old BOLT 2 text, which restricted the closing
* fee to cap at the final commitment fee. We still do this for now.
*
* The sending node:
* - MUST set `fee_satoshis` less than or equal to the base
* fee of the final commitment transaction, as calculated in
* [BOLT #3](03-transactions.md#fee-calculation).
*/
final_commit_feerate = get_feerate(channel->fee_states,
channel->opener, LOCAL);
feelimit = commit_tx_base_fee(final_commit_feerate, 0,
option_anchor_outputs);
/* If we can't determine feerate, start at half unilateral feerate. */
feerate = mutual_close_feerate(ld->topology);
if (!feerate) {
feerate = final_commit_feerate / 2;
if (feerate < feerate_floor())
feerate = feerate_floor();
}
/* We use a feerate if anchor_outputs, otherwise max fee is set by
* the final unilateral. */
if (option_anchor_outputs) {
max_feerate = tal(tmpctx, u32);
/* Aim for reasonable max, but use final if we don't know. */
*max_feerate = unilateral_feerate(ld->topology);
if (!*max_feerate)
*max_feerate = final_commit_feerate;
/* No other limit on fees */
feelimit = channel->funding_sats;
} else
max_feerate = NULL;
min_feerate = feerate_min(ld, NULL);
/* If they specified feerates in `close`, they apply now! */
if (channel->closing_feerate_range) {
min_feerate = channel->closing_feerate_range[0];
max_feerate = &channel->closing_feerate_range[1];
}
/* BOLT #3:
*
* Each node offering a signature:
* - MUST round each output down to whole satoshis.
*/
/* What is not ours is theirs */
if (!amount_sat_sub_msat(&their_msat,
channel->funding_sats, channel->our_msat)) {
log_broken(channel->log, "our_msat overflow funding %s minus %s",
type_to_string(tmpctx, struct amount_sat,
&channel->funding_sats),
type_to_string(tmpctx, struct amount_msat,
&channel->our_msat));
channel_fail_permanent(channel,
REASON_LOCAL,
"our_msat overflow on closing");
return;
}
// Determine the wallet index for our output or NULL if not found.
u32 *local_wallet_index = NULL;
struct ext_key *local_wallet_ext_key = NULL;
u32 index_val;
struct ext_key ext_key_val;
bool is_p2sh;
if (wallet_can_spend(
ld->wallet,
channel->shutdown_scriptpubkey[LOCAL],
&index_val,
&is_p2sh)) {
if (bip32_key_from_parent(
ld->wallet->bip32_base,
index_val,
BIP32_FLAG_KEY_PUBLIC,
&ext_key_val) != WALLY_OK) {
channel_internal_error(channel, "Could not derive ext public key");
return;
}
local_wallet_index = &index_val;
local_wallet_ext_key = &ext_key_val;
}
initmsg = towire_closingd_init(tmpctx,
chainparams,
&channel->cid,
&channel->funding,
channel->funding_sats,
&channel->local_funding_pubkey,
&channel->channel_info.remote_fundingkey,
channel->opener,
amount_msat_to_sat_round_down(channel->our_msat),
amount_msat_to_sat_round_down(their_msat),
channel->our_config.dust_limit,
min_feerate, feerate, max_feerate,
feelimit,
local_wallet_index,
local_wallet_ext_key,
channel->shutdown_scriptpubkey[LOCAL],
channel->shutdown_scriptpubkey[REMOTE],
channel->closing_fee_negotiation_step,
channel->closing_fee_negotiation_step_unit,
/* Don't quickclose if they specified how to negotiate! */
(channel->closing_fee_negotiation_step == 50
&& channel->closing_fee_negotiation_step_unit == CLOSING_FEE_NEGOTIATION_STEP_UNIT_PERCENTAGE)
/* Always use quickclose with anchors */
|| option_anchor_outputs,
channel->shutdown_wrong_funding);
/* We don't expect a response: it will give us feedback on
* signatures sent and received, then closing_complete. */
subd_send_msg(channel->owner, take(initmsg));
/* Now tell gossipd that we're closing and that neither direction should
* be used. */
if (channel->scid)
subd_send_msg(channel->peer->ld->gossip,
take(towire_gossipd_local_channel_close(
tmpctx, channel->scid)));
}
static struct command_result *param_outpoint(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
struct bitcoin_outpoint **outp)
{
*outp = tal(cmd, struct bitcoin_outpoint);
if (json_to_outpoint(buffer, tok, *outp))
return NULL;
return command_fail_badparam(cmd, name, buffer, tok,
"should be a txid:outnum");
}
static struct command_result *param_feerate_range(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
u32 **feerate_range)
{
struct command_result *ret;
u32 *rate;
*feerate_range = tal_arr(cmd, u32, 2);
if (tok->type != JSMN_ARRAY || tok->size != 2)
return command_fail_badparam(cmd, name, buffer, tok,
"should be an array of 2 entries");
ret = param_feerate(cmd, name, buffer, tok+1, &rate);
if (ret)
return ret;
(*feerate_range)[0] = *rate;
ret = param_feerate(cmd, name, buffer, tok+2, &rate);
if (ret)
return ret;
(*feerate_range)[1] = *rate;
return NULL;
}
/* Only one of these will be set! */
struct some_channel {
struct channel *channel;
struct channel *unsaved_channel;
struct uncommitted_channel *uc;
};
static struct command_result *param_channel_or_peer(struct command *cmd,
const char *name,
const char *buffer,
const jsmntok_t *tok,
struct some_channel **sc)
{
struct peer *peer = peer_from_json(cmd->ld, buffer, tok);
bool more_than_one;
(*sc)->unsaved_channel = NULL;
(*sc)->uc = NULL;
if (peer) {
(*sc)->channel = peer_any_active_channel(peer, &more_than_one);
if ((*sc)->channel) {
if (more_than_one)
goto more_than_one;
return NULL;
}
} else {
struct command_result *res;
res = command_find_channel(cmd, buffer, tok, &(*sc)->channel);
if (res)
return res;
assert((*sc)->channel);
return NULL;
}
/* OK, we have a peer, but no active channels. */
(*sc)->uc = peer->uncommitted_channel;
if ((*sc)->uc)
return NULL;
(*sc)->unsaved_channel = peer_any_unsaved_channel(peer, &more_than_one);
if ((*sc)->unsaved_channel) {
if (more_than_one)
goto more_than_one;
return NULL;
}
return command_fail(cmd, LIGHTNINGD, "Peer has no active channel");
more_than_one:
return command_fail(cmd, LIGHTNINGD,
"Peer has multiple channels: use channel_id or short_channel_id");
}
static struct command_result *json_close(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct channel *channel;
unsigned int *timeout;
const u8 *close_to_script = NULL;
u32 *final_index;
u32 index_val;
bool close_script_set, wrong_funding_changed, *force_lease_close;
const char *fee_negotiation_step_str;
struct bitcoin_outpoint *wrong_funding;
u32 *feerate_range;
char* end;
bool anysegwit;
struct some_channel *sc = talz(tmpctx, struct some_channel);
if (!param(cmd, buffer, params,
p_req("id", param_channel_or_peer, &sc),
p_opt_def("unilateraltimeout", param_number, &timeout,
48 * 3600),
p_opt("destination", param_bitcoin_address, &close_to_script),
p_opt("fee_negotiation_step", param_string,
&fee_negotiation_step_str),
p_opt("wrong_funding", param_outpoint, &wrong_funding),
p_opt_def("force_lease_closed", param_bool,
&force_lease_close, false),
p_opt("feerange", param_feerate_range, &feerate_range),
NULL))
return command_param_failed();
/* Easy cases: peer can simply be forgotten. */
if (sc->uc) {
kill_uncommitted_channel(sc->uc, "close command called");
goto discard_unopened;
}
if (sc->unsaved_channel) {
channel_unsaved_close_conn(sc->unsaved_channel,
"close command called");
goto discard_unopened;
}
channel = sc->channel;
assert(channel);
if (!*force_lease_close && sc->channel->opener != LOCAL
&& get_block_height(cmd->ld->topology) < channel->lease_expiry)
return command_fail(cmd, LIGHTNINGD,
"Peer leased this channel from us, we"
" shouldn't close until lease has expired"
" (lease expires block %u,"
" current block %u)",
channel->lease_expiry,
get_block_height(cmd->ld->topology));
/* Set the wallet index to the default value; it is updated
* below if the close_to_script is found to be in the
* wallet. If the close_to_script is not in the wallet
* final_index will be set to NULL instead.*/
assert(channel->final_key_idx <= UINT32_MAX);
index_val = (u32) channel->final_key_idx;
final_index = &index_val;
/* If we've set a local shutdown script for this peer, and it's not the
* default upfront script, try to close to a different channel.
* Error is an operator error */
if (close_to_script && channel->shutdown_scriptpubkey[LOCAL]
&& !memeq(close_to_script,
tal_count(close_to_script),
channel->shutdown_scriptpubkey[LOCAL],
tal_count(channel->shutdown_scriptpubkey[LOCAL]))) {
u8 *default_close_to = p2wpkh_for_keyidx(tmpctx, cmd->ld,
channel->final_key_idx);
if (!memeq(default_close_to, tal_count(default_close_to),
channel->shutdown_scriptpubkey[LOCAL],
tal_count(channel->shutdown_scriptpubkey[LOCAL]))) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Destination address %s does not match "
"previous shutdown script %s",
tal_hex(tmpctx, channel->shutdown_scriptpubkey[LOCAL]),
tal_hex(tmpctx, close_to_script));
} else {
channel->shutdown_scriptpubkey[LOCAL] =
tal_free(channel->shutdown_scriptpubkey[LOCAL]);
channel->shutdown_scriptpubkey[LOCAL] =
tal_steal(channel, close_to_script);
close_script_set = true;
}
} else if (close_to_script && !channel->shutdown_scriptpubkey[LOCAL]) {
channel->shutdown_scriptpubkey[LOCAL]
= tal_steal(channel, cast_const(u8 *, close_to_script));
close_script_set = true;
/* Is the close script in our wallet? */
bool is_p2sh;
if (wallet_can_spend(
cmd->ld->wallet,
channel->shutdown_scriptpubkey[LOCAL],
&index_val,
&is_p2sh)) {
/* index_val has been set to the discovered wallet index */
} else {
final_index = NULL;
}
} else if (!channel->shutdown_scriptpubkey[LOCAL]) {
channel->shutdown_scriptpubkey[LOCAL]
= p2wpkh_for_keyidx(channel, cmd->ld, channel->final_key_idx);
/* We don't save the default to disk */
close_script_set = false;
} else
close_script_set = false;
/* Don't send a scriptpubkey peer won't accept */
anysegwit = feature_negotiated(cmd->ld->our_features,
channel->peer->their_features,
OPT_SHUTDOWN_ANYSEGWIT);
if (!valid_shutdown_scriptpubkey(channel->shutdown_scriptpubkey[LOCAL],
anysegwit, !deprecated_apis)) {
/* Explicit check for future segwits. */
if (!anysegwit &&
valid_shutdown_scriptpubkey(channel->shutdown_scriptpubkey
[LOCAL], true, !deprecated_apis)) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Peer does not allow v1+ shutdown addresses");
}
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Invalid close destination");
}
if (fee_negotiation_step_str == NULL) {
channel->closing_fee_negotiation_step = 50;
channel->closing_fee_negotiation_step_unit =
CLOSING_FEE_NEGOTIATION_STEP_UNIT_PERCENTAGE;
} else {
channel->closing_fee_negotiation_step =
strtoull(fee_negotiation_step_str, &end, 10);
if (channel->closing_fee_negotiation_step == 0)
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"Wrong value given for fee_negotiation_step: "
"\"%s\", must be positive",
fee_negotiation_step_str);
else if (*end == '%') {
if (channel->closing_fee_negotiation_step > 100)
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"Wrong value given for "
"fee_negotiation_step: \"%s\", the "
"percentage should be between 1 and 100",
fee_negotiation_step_str);
channel->closing_fee_negotiation_step_unit =
CLOSING_FEE_NEGOTIATION_STEP_UNIT_PERCENTAGE;
} else if (*end == '\0')
channel->closing_fee_negotiation_step_unit =
CLOSING_FEE_NEGOTIATION_STEP_UNIT_SATOSHI;
else
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"Wrong value given for fee_negotiation_step: "
"\"%s\", should be an integer or an integer "
"followed by %%",
fee_negotiation_step_str);
}
if (wrong_funding) {
if (!feature_negotiated(cmd->ld->our_features,
channel->peer->their_features,
OPT_SHUTDOWN_WRONG_FUNDING)) {
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"wrong_funding feature not negotiated"
" (we said %s, they said %s: try experimental-shutdown-wrong-funding?)",
feature_offered(cmd->ld->our_features
->bits[INIT_FEATURE],
OPT_SHUTDOWN_WRONG_FUNDING)
? "yes" : "no",
feature_offered(channel->peer->their_features,
OPT_SHUTDOWN_WRONG_FUNDING)
? "yes" : "no");
}
wrong_funding_changed = true;
channel->shutdown_wrong_funding
= tal_steal(channel, wrong_funding);
} else {
if (channel->shutdown_wrong_funding) {
channel->shutdown_wrong_funding
= tal_free(channel->shutdown_wrong_funding);
wrong_funding_changed = true;
} else
wrong_funding_changed = false;
}
/* May already be set by previous close cmd. */
tal_free(channel->closing_feerate_range);
/* Works fine if feerate_range is NULL */
channel->closing_feerate_range = tal_steal(channel, feerate_range);
/* Normal case.
* We allow states shutting down and sigexchange; a previous
* close command may have timed out, and this current command
* will continue waiting for the effects of the previous
* close command. */
/* If normal or locking in, transition to shutting down
* state.
* (if already shutting down or sigexchange, just keep
* waiting) */
switch (channel->state) {
case CHANNELD_NORMAL:
case CHANNELD_AWAITING_LOCKIN:
case DUALOPEND_AWAITING_LOCKIN:
channel_set_state(channel,
channel->state, CHANNELD_SHUTTING_DOWN,
REASON_USER,
"User or plugin invoked close command");
/* fallthrough */
case CHANNELD_SHUTTING_DOWN:
if (channel->owner) {
u8 *msg;
if (streq(channel->owner->name, "dualopend")) {
msg = towire_dualopend_send_shutdown(
NULL,
channel->shutdown_scriptpubkey[LOCAL]);
} else {
struct ext_key ext_key_val;
struct ext_key *final_ext_key = NULL;
if (final_index) {
if (bip32_key_from_parent(
channel->peer->ld->wallet->bip32_base,
*final_index,
BIP32_FLAG_KEY_PUBLIC,
&ext_key_val) != WALLY_OK) {
return command_fail(
cmd, LIGHTNINGD,
"Could not derive final_ext_key");
}
final_ext_key = &ext_key_val;
}
msg = towire_channeld_send_shutdown(
NULL,
final_index,
final_ext_key,
channel->shutdown_scriptpubkey[LOCAL],
channel->shutdown_wrong_funding);
}
subd_send_msg(channel->owner, take(msg));
}
break;
case CLOSINGD_SIGEXCHANGE:
break;
default:
return command_fail(cmd, LIGHTNINGD, "Channel is in state %s",
channel_state_name(channel));
}
/* Register this command for later handling. */
register_close_command(cmd->ld, cmd, channel, *timeout);
/* If we set `channel->shutdown_scriptpubkey[LOCAL]` or
* changed shutdown_wrong_funding, save it. */
if (close_script_set || wrong_funding_changed)
wallet_channel_save(cmd->ld->wallet, channel);
/* Wait until close drops down to chain. */
return command_still_pending(cmd);
discard_unopened: {
struct json_stream *result = json_stream_success(cmd);
json_add_string(result, "type", "unopened");
return command_success(cmd, result);
}
}
static const struct json_command close_command = {
"close",
"channels",
json_close,
"Close the channel with {id} "
"(either peer ID, channel ID, or short channel ID). "
"Force a unilateral close after {unilateraltimeout} seconds (default 48h). "
"If {destination} address is provided, will be used as output address."
};
AUTODATA(json_command, &close_command);
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