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lightning/lightningd/opening_control.c

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#include <bitcoin/privkey.h>
#include <bitcoin/script.h>
#include <ccan/tal/str/str.h>
#include <common/channel_config.h>
#include <common/funding_tx.h>
#include <common/key_derive.h>
#include <common/wallet_tx.h>
#include <common/wire_error.h>
#include <connectd/gen_connect_wire.h>
#include <errno.h>
#include <hsmd/gen_hsm_wire.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel_control.h>
#include <lightningd/closing_control.h>
#include <lightningd/hsm_control.h>
#include <lightningd/json.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/jsonrpc_errors.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/opening_control.h>
#include <lightningd/param.h>
#include <lightningd/peer_control.h>
#include <lightningd/subd.h>
#include <openingd/gen_opening_wire.h>
#include <wire/wire.h>
#include <wire/wire_sync.h>
/* Channel we're still opening. */
struct uncommitted_channel {
/* peer->uncommitted_channel == this */
struct peer *peer;
/* openingd which is running now */
struct subd *openingd;
/* Reserved dbid for if we become a real struct channel */
u64 dbid;
/* For logging */
struct log *log;
/* Openingd can tell us stuff. */
const char *transient_billboard;
/* If we offered channel, this contains information, otherwise NULL */
struct funding_channel *fc;
/* Our basepoints for the channel. */
struct basepoints local_basepoints;
/* Public key for funding tx. */
struct pubkey local_funding_pubkey;
/* These are *not* filled in by new_uncommitted_channel: */
/* Minimum funding depth (if funder == REMOTE). */
u32 minimum_depth;
/* Our channel config. */
struct channel_config our_config;
};
struct funding_channel {
struct command *cmd; /* Which also owns us. */
struct wallet_tx wtx;
u64 push_msat;
u8 channel_flags;
/* Peer we're trying to reach. */
struct pubkey peerid;
/* Channel. */
struct uncommitted_channel *uc;
};
static void uncommitted_channel_disconnect(struct uncommitted_channel *uc,
const char *desc)
{
u8 *msg = towire_connectctl_peer_disconnected(tmpctx, &uc->peer->id);
log_info(uc->log, "%s", desc);
subd_send_msg(uc->peer->ld->connectd, msg);
if (uc->fc)
command_fail(uc->fc->cmd, LIGHTNINGD, "%s", desc);
}
void kill_uncommitted_channel(struct uncommitted_channel *uc,
const char *why)
{
log_info(uc->log, "Killing openingd: %s", why);
/* Close openingd. */
subd_release_channel(uc->openingd, uc);
uc->openingd = NULL;
uncommitted_channel_disconnect(uc, why);
tal_free(uc);
}
void json_add_uncommitted_channel(struct json_result *response,
const struct uncommitted_channel *uc)
{
u64 msatoshi_total, our_msatoshi;
if (!uc)
return;
/* If we're chatting but no channel, that's shown by connected: True */
if (!uc->fc)
return;
json_object_start(response, NULL);
json_add_string(response, "state", "OPENINGD");
json_add_string(response, "owner", "lightning_openingd");
json_add_string(response, "funding", "LOCAL");
if (uc->transient_billboard) {
json_array_start(response, "status");
json_add_string(response, NULL, uc->transient_billboard);
json_array_end(response);
}
msatoshi_total = uc->fc->wtx.amount * 1000;
our_msatoshi = msatoshi_total - uc->fc->push_msat;
json_add_u64(response, "msatoshi_to_us", our_msatoshi);
json_add_u64(response, "msatoshi_total", msatoshi_total);
json_object_end(response);
}
/* Steals fields from uncommitted_channel: returns NULL if can't generate a
* key for this channel (shouldn't happen!). */
static struct channel *
wallet_commit_channel(struct lightningd *ld,
struct uncommitted_channel *uc,
struct bitcoin_tx *remote_commit,
secp256k1_ecdsa_signature *remote_commit_sig,
const struct bitcoin_txid *funding_txid,
u16 funding_outnum,
u64 funding_satoshi,
u64 push_msat,
u8 channel_flags,
struct channel_info *channel_info,
u32 feerate)
{
struct channel *channel;
u64 our_msatoshi;
s64 final_key_idx;
/* Get a key to use for closing outputs from this tx */
final_key_idx = wallet_get_newindex(ld);
if (final_key_idx == -1) {
log_broken(uc->log, "Can't get final key index");
return NULL;
}
if (uc->fc)
our_msatoshi = funding_satoshi * 1000 - push_msat;
else
our_msatoshi = push_msat;
/* Feerates begin identical. */
channel_info->feerate_per_kw[LOCAL]
= channel_info->feerate_per_kw[REMOTE]
= feerate;
/* old_remote_per_commit not valid yet, copy valid one. */
channel_info->old_remote_per_commit = channel_info->remote_per_commit;
channel = new_channel(uc->peer, uc->dbid,
NULL, /* No shachain yet */
CHANNELD_AWAITING_LOCKIN,
uc->fc ? LOCAL : REMOTE,
uc->log,
take(uc->transient_billboard),
channel_flags,
&uc->our_config,
uc->minimum_depth,
1, 1, 0,
funding_txid,
funding_outnum,
funding_satoshi,
push_msat,
false, /* !remote_funding_locked */
NULL, /* no scid yet */
/* The three arguments below are msatoshi_to_us,
* msatoshi_to_us_min, and msatoshi_to_us_max.
* Because, this is a newly-funded channel,
* all three are same value. */
our_msatoshi,
our_msatoshi, /* msatoshi_to_us_min */
our_msatoshi, /* msatoshi_to_us_max */
remote_commit,
remote_commit_sig,
NULL, /* No HTLC sigs yet */
channel_info,
NULL, /* No remote_shutdown_scriptpubkey yet */
final_key_idx, false,
NULL, /* No commit sent yet */
/* If we're fundee, could be a little before this
* in theory, but it's only used for timing out. */
get_block_height(ld->topology),
feerate, feerate,
/* We are connected */
true,
&uc->local_basepoints,
&uc->local_funding_pubkey,
NULL);
/* Now we finally put it in the database. */
wallet_channel_insert(ld->wallet, channel);
return channel;
}
static void funding_broadcast_failed(struct channel *channel,
int exitstatus, const char *err)
{
channel_internal_error(channel,
"Funding broadcast exited with %i: %s",
exitstatus, err);
}
static void opening_funder_finished(struct subd *openingd, const u8 *resp,
const int *fds,
struct funding_channel *fc)
{
u8 *msg, *linear;
struct channel_info channel_info;
struct bitcoin_tx *fundingtx;
struct bitcoin_txid funding_txid, expected_txid;
struct pubkey changekey;
struct crypto_state cs;
secp256k1_ecdsa_signature remote_commit_sig;
struct bitcoin_tx *remote_commit;
u16 funding_outnum;
u32 feerate;
u64 change_satoshi;
struct channel *channel;
struct json_result *response;
struct lightningd *ld = openingd->ld;
struct channel_id cid;
assert(tal_count(fds) == 2);
/* This is a new channel_info.their_config so set its ID to 0 */
channel_info.their_config.id = 0;
if (!fromwire_opening_funder_reply(resp, resp,
&channel_info.their_config,
&remote_commit,
&remote_commit_sig,
&cs,
&channel_info.theirbase.revocation,
&channel_info.theirbase.payment,
&channel_info.theirbase.htlc,
&channel_info.theirbase.delayed_payment,
&channel_info.remote_per_commit,
&fc->uc->minimum_depth,
&channel_info.remote_fundingkey,
&expected_txid,
&feerate,
&fc->uc->our_config.channel_reserve_satoshis)) {
log_broken(fc->uc->log,
"bad OPENING_FUNDER_REPLY %s",
tal_hex(resp, resp));
command_fail(fc->cmd, LIGHTNINGD, "bad OPENING_FUNDER_REPLY %s",
tal_hex(fc->cmd, resp));
goto failed;
}
log_debug(ld->log,
"%s", type_to_string(tmpctx, struct pubkey,
&channel_info.remote_per_commit));
/* Generate the funding tx. */
if (fc->wtx.change
&& !bip32_pubkey(ld->wallet->bip32_base,
&changekey, fc->wtx.change_key_index))
fatal("Error deriving change key %u", fc->wtx.change_key_index);
fundingtx = funding_tx(tmpctx, &funding_outnum,
fc->wtx.utxos, fc->wtx.amount,
&fc->uc->local_funding_pubkey,
&channel_info.remote_fundingkey,
fc->wtx.change, &changekey,
ld->wallet->bip32_base);
log_debug(fc->uc->log, "Funding tx has %zi inputs, %zu outputs:",
tal_count(fundingtx->input),
tal_count(fundingtx->output));
for (size_t i = 0; i < tal_count(fundingtx->input); i++) {
log_debug(fc->uc->log, "%zi: %"PRIu64" satoshi (%s) %s\n",
i, fc->wtx.utxos[i]->amount,
fc->wtx.utxos[i]->is_p2sh ? "P2SH" : "SEGWIT",
type_to_string(tmpctx, struct bitcoin_txid,
&fundingtx->input[i].txid));
}
bitcoin_txid(fundingtx, &funding_txid);
if (!bitcoin_txid_eq(&funding_txid, &expected_txid)) {
log_broken(fc->uc->log,
"Funding txid mismatch:"
" satoshi %"PRIu64" change %"PRIu64
" changeidx %u"
" localkey %s remotekey %s",
fc->wtx.amount,
fc->wtx.change, fc->wtx.change_key_index,
type_to_string(fc, struct pubkey,
&fc->uc->local_funding_pubkey),
type_to_string(fc, struct pubkey,
&channel_info.remote_fundingkey));
command_fail(fc->cmd, JSONRPC2_INVALID_PARAMS,
"Funding txid mismatch:"
" satoshi %"PRIu64" change %"PRIu64
" changeidx %u"
" localkey %s remotekey %s",
fc->wtx.amount,
fc->wtx.change, fc->wtx.change_key_index,
type_to_string(fc, struct pubkey,
&fc->uc->local_funding_pubkey),
type_to_string(fc, struct pubkey,
&channel_info.remote_fundingkey));
goto failed;
}
/* Steals fields from uc */
channel = wallet_commit_channel(ld, fc->uc,
remote_commit,
&remote_commit_sig,
&funding_txid,
funding_outnum,
fc->wtx.amount,
fc->push_msat,
fc->channel_flags,
&channel_info,
feerate);
if (!channel) {
command_fail(fc->cmd, LIGHTNINGD,
"Key generation failure");
goto failed;
}
/* Get HSM to sign the funding tx. */
log_debug(channel->log, "Getting HSM to sign funding tx");
msg = towire_hsm_sign_funding(tmpctx, channel->funding_satoshi,
fc->wtx.change, fc->wtx.change_key_index,
&fc->uc->local_funding_pubkey,
&channel_info.remote_fundingkey,
fc->wtx.utxos);
if (!wire_sync_write(ld->hsm_fd, take(msg)))
fatal("Could not write to HSM: %s", strerror(errno));
msg = wire_sync_read(fc, ld->hsm_fd);
if (!fromwire_hsm_sign_funding_reply(tmpctx, msg, &fundingtx))
fatal("HSM gave bad sign_funding_reply %s",
tal_hex(msg, resp));
/* Extract the change output and add it to the DB */
wallet_extract_owned_outputs(ld->wallet, fundingtx, NULL, &change_satoshi);
/* Make sure we recognize our change output by its scriptpubkey in
* future. This assumes that we have only two outputs, may not be true
* if we add support for multifundchannel */
if (tal_count(fundingtx->output) == 2)
txfilter_add_scriptpubkey(ld->owned_txfilter, fundingtx->output[!funding_outnum].script);
/* Send it out and watch for confirms. */
broadcast_tx(ld->topology, channel, fundingtx, funding_broadcast_failed);
channel_watch_funding(ld, channel);
/* Start normal channel daemon. */
peer_start_channeld(channel, &cs, fds[0], fds[1], NULL, false);
wallet_confirm_utxos(ld->wallet, fc->wtx.utxos);
response = new_json_result(fc->cmd);
json_object_start(response, NULL);
linear = linearize_tx(response, fundingtx);
json_add_hex_talarr(response, "tx", linear);
json_add_txid(response, "txid", &channel->funding_txid);
derive_channel_id(&cid, &channel->funding_txid, funding_outnum);
json_add_string(response, "channel_id",
type_to_string(tmpctx, struct channel_id, &cid));
json_object_end(response);
command_success(fc->cmd, response);
subd_release_channel(openingd, fc->uc);
fc->uc->openingd = NULL;
/* Frees fc too, and tmpctx */
tal_free(fc->uc);
return;
failed:
close(fds[0]);
close(fds[1]);
subd_release_channel(openingd, fc->uc);
fc->uc->openingd = NULL;
/* Frees fc too, and tmpctx */
tal_free(fc->uc);
}
static void opening_fundee_finished(struct subd *openingd,
const u8 *reply,
const int *fds,
struct uncommitted_channel *uc)
{
u8 *funding_signed;
struct channel_info channel_info;
struct crypto_state cs;
secp256k1_ecdsa_signature remote_commit_sig;
struct bitcoin_tx *remote_commit;
struct lightningd *ld = openingd->ld;
struct bitcoin_txid funding_txid;
u16 funding_outnum;
u64 funding_satoshi, push_msat;
u32 feerate;
u8 channel_flags;
struct channel *channel;
log_debug(uc->log, "Got opening_fundee_finish_response");
assert(tal_count(fds) == 2);
/* This is a new channel_info.their_config, set its ID to 0 */
channel_info.their_config.id = 0;
if (!fromwire_opening_fundee(tmpctx, reply,
&channel_info.their_config,
&remote_commit,
&remote_commit_sig,
&cs,
&channel_info.theirbase.revocation,
&channel_info.theirbase.payment,
&channel_info.theirbase.htlc,
&channel_info.theirbase.delayed_payment,
&channel_info.remote_per_commit,
&channel_info.remote_fundingkey,
&funding_txid,
&funding_outnum,
&funding_satoshi,
&push_msat,
&channel_flags,
&feerate,
&funding_signed,
&uc->our_config.channel_reserve_satoshis)) {
log_broken(uc->log, "bad OPENING_FUNDEE_REPLY %s",
tal_hex(reply, reply));
uncommitted_channel_disconnect(uc, "bad OPENING_FUNDEE_REPLY");
goto failed;
}
/* openingd should never accept them funding channel in this case. */
if (peer_active_channel(uc->peer)) {
log_broken(uc->log, "openingd accepted peer funding channel");
uncommitted_channel_disconnect(uc, "already have active channel");
goto failed;
}
/* Consumes uc */
channel = wallet_commit_channel(ld, uc,
remote_commit,
&remote_commit_sig,
&funding_txid,
funding_outnum,
funding_satoshi,
push_msat,
channel_flags,
&channel_info,
feerate);
if (!channel) {
uncommitted_channel_disconnect(uc, "Commit channel failed");
goto failed;
}
log_debug(channel->log, "Watching funding tx %s",
type_to_string(reply, struct bitcoin_txid,
&channel->funding_txid));
channel_watch_funding(ld, channel);
/* On to normal operation! */
peer_start_channeld(channel, &cs,
fds[0], fds[1], funding_signed, false);
subd_release_channel(openingd, uc);
uc->openingd = NULL;
tal_free(uc);
return;
failed:
close(fds[0]);
close(fds[1]);
tal_free(uc);
}
static void opening_funder_failed(struct subd *openingd, const u8 *msg,
struct uncommitted_channel *uc)
{
char *desc;
if (!fromwire_opening_funder_failed(msg, msg, &desc)) {
log_broken(uc->log,
"bad OPENING_FUNDER_FAILED %s",
tal_hex(tmpctx, msg));
command_fail(uc->fc->cmd, LIGHTNINGD,
"bad OPENING_FUNDER_FAILED %s",
tal_hex(uc->fc->cmd, msg));
tal_free(uc);
return;
}
command_fail(uc->fc->cmd, LIGHTNINGD, "%s", desc);
/* Clear uc->fc, so we can try again, and so we don't fail twice
* if they close. */
uc->fc = tal_free(uc->fc);
}
static void opening_channel_errmsg(struct uncommitted_channel *uc,
int peer_fd, int gossip_fd,
const struct crypto_state *cs,
const struct channel_id *channel_id UNUSED,
const char *desc,
const u8 *err_for_them UNUSED)
{
if (peer_fd != -1) {
close(peer_fd);
close(gossip_fd);
}
uncommitted_channel_disconnect(uc, desc);
tal_free(uc);
}
/* There's nothing permanent in an unconfirmed transaction */
static void opening_channel_set_billboard(struct uncommitted_channel *uc,
bool perm UNUSED,
const char *happenings TAKES)
{
uc->transient_billboard = tal_free(uc->transient_billboard);
if (happenings)
uc->transient_billboard = tal_strdup(uc, happenings);
}
static void destroy_uncommitted_channel(struct uncommitted_channel *uc)
{
if (uc->openingd) {
struct subd *openingd = uc->openingd;
uc->openingd = NULL;
subd_release_channel(openingd, uc);
}
/* This is how shutdown_subdaemons tells us not to delete from db! */
if (!uc->peer->uncommitted_channel)
return;
uc->peer->uncommitted_channel = NULL;
maybe_delete_peer(uc->peer);
}
static struct uncommitted_channel *
new_uncommitted_channel(struct peer *peer)
{
struct lightningd *ld = peer->ld;
struct uncommitted_channel *uc = tal(ld, struct uncommitted_channel);
char *idname;
uc->peer = peer;
assert(!peer->uncommitted_channel);
uc->transient_billboard = NULL;
uc->dbid = wallet_get_channel_dbid(ld->wallet);
idname = type_to_string(uc, struct pubkey, &uc->peer->id);
uc->log = new_log(uc, uc->peer->log_book, "%s chan #%"PRIu64":",
idname, uc->dbid);
tal_free(idname);
uc->fc = NULL;
uc->our_config.id = 0;
get_channel_basepoints(ld, &uc->peer->id, uc->dbid,
&uc->local_basepoints, &uc->local_funding_pubkey);
uc->peer->uncommitted_channel = uc;
tal_add_destructor(uc, destroy_uncommitted_channel);
return uc;
}
static void channel_config(struct lightningd *ld,
struct channel_config *ours,
u32 *max_to_self_delay,
u64 *min_effective_htlc_capacity_msat)
{
/* FIXME: depend on feerate. */
*max_to_self_delay = ld->config.locktime_max;
/* This is 1c at $1000/BTC */
*min_effective_htlc_capacity_msat = 1000000;
/* BOLT #2:
*
* The sending node SHOULD:
*...
* - set `dust_limit_satoshis` to a sufficient value to allow
* commitment transactions to propagate through the Bitcoin network.
*/
ours->dust_limit_satoshis = 546;
ours->max_htlc_value_in_flight_msat = UINT64_MAX;
/* Don't care */
ours->htlc_minimum_msat = 0;
/* BOLT #2:
*
* The sending node SHOULD:
* - set `to_self_delay` sufficient to ensure the sender can
* irreversibly spend a commitment transaction output, in case of
* misbehavior by the receiver.
*/
ours->to_self_delay = ld->config.locktime_blocks;
/* BOLT #2:
*
* The receiving node MUST fail the channel if:
*...
* - `max_accepted_htlcs` is greater than 483.
*/
ours->max_accepted_htlcs = 483;
/* This is filled in by lightning_openingd, for consistency. */
ours->channel_reserve_satoshis = -1;
}
static unsigned int openingd_msg(struct subd *openingd,
const u8 *msg, const int *fds)
{
enum opening_wire_type t = fromwire_peektype(msg);
struct uncommitted_channel *uc = openingd->channel;
switch (t) {
case WIRE_OPENING_FUNDER_REPLY:
if (!uc->fc) {
log_broken(openingd->log, "Unexpected FUNDER_REPLY %s",
tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
if (tal_count(fds) != 2)
return 2;
opening_funder_finished(openingd, msg, fds, uc->fc);
return 0;
case WIRE_OPENING_FUNDER_FAILED:
if (!uc->fc) {
log_broken(openingd->log, "Unexpected FUNDER_FAILED %s",
tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
opening_funder_failed(openingd, msg, uc);
return 0;
case WIRE_OPENING_FUNDEE:
if (tal_count(fds) != 2)
return 2;
opening_fundee_finished(openingd, msg, fds, uc);
return 0;
/* We send these! */
case WIRE_OPENING_INIT:
case WIRE_OPENING_FUNDER:
case WIRE_OPENING_CAN_ACCEPT_CHANNEL:
break;
}
log_broken(openingd->log, "Unexpected msg %s: %s",
opening_wire_type_name(t), tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
void peer_start_openingd(struct peer *peer,
const struct crypto_state *cs,
int peer_fd, int gossip_fd,
const u8 *send_msg)
{
int hsmfd;
u32 max_to_self_delay;
u64 min_effective_htlc_capacity_msat;
struct uncommitted_channel *uc;
const u8 *msg;
assert(!peer->uncommitted_channel);
uc = peer->uncommitted_channel = new_uncommitted_channel(peer);
hsmfd = hsm_get_client_fd(peer->ld, &uc->peer->id, uc->dbid,
HSM_CAP_COMMITMENT_POINT
| HSM_CAP_SIGN_REMOTE_TX);
uc->openingd = new_channel_subd(peer->ld,
"lightning_openingd",
uc, uc->log,
true, opening_wire_type_name,
openingd_msg,
opening_channel_errmsg,
opening_channel_set_billboard,
take(&peer_fd), take(&gossip_fd),
take(&hsmfd), NULL);
if (!uc->openingd) {
uncommitted_channel_disconnect(uc,
tal_fmt(tmpctx,
"Running lightning_openingd: %s",
strerror(errno)));
return;
}
channel_config(peer->ld, &uc->our_config,
&max_to_self_delay,
&min_effective_htlc_capacity_msat);
/* BOLT #2:
*
* The sender:
* - SHOULD set `minimum_depth` to a number of blocks it considers
* reasonable to avoid double-spending of the funding transaction.
*/
uc->minimum_depth = peer->ld->config.anchor_confirms;
msg = towire_opening_init(NULL,
&get_chainparams(peer->ld)->genesis_blockhash,
&uc->our_config,
max_to_self_delay,
min_effective_htlc_capacity_msat,
cs, &uc->local_basepoints,
&uc->local_funding_pubkey,
uc->minimum_depth,
feerate_min(peer->ld, NULL),
feerate_max(peer->ld, NULL),
!peer_active_channel(peer),
send_msg);
subd_send_msg(uc->openingd, take(msg));
}
void opening_peer_no_active_channels(struct peer *peer)
{
assert(!peer_active_channel(peer));
if (peer->uncommitted_channel) {
subd_send_msg(peer->uncommitted_channel->openingd,
take(towire_opening_can_accept_channel(NULL)));
}
}
/**
* json_fund_channel - Entrypoint for funding a channel
*/
static void json_fund_channel(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
const jsmntok_t *sattok;
struct funding_channel * fc = tal(cmd, struct funding_channel);
struct pubkey *id;
struct peer *peer;
struct channel *channel;
u32 *feerate_per_kw;
u8 *msg;
u64 max_funding_satoshi = get_chainparams(cmd->ld)->max_funding_satoshi;
fc->cmd = cmd;
fc->uc = NULL;
wtx_init(cmd, &fc->wtx);
if (!param(fc->cmd, buffer, params,
p_req("id", json_tok_pubkey, &id),
p_req("satoshi", json_tok_tok, &sattok),
p_opt("feerate", json_tok_feerate, &feerate_per_kw),
NULL))
return;
if (!json_tok_wtx(&fc->wtx, buffer, sattok, max_funding_satoshi))
return;
if (!feerate_per_kw) {
feerate_per_kw = tal(cmd, u32);
*feerate_per_kw = opening_feerate(cmd->ld->topology);
if (!*feerate_per_kw) {
command_fail(cmd, LIGHTNINGD, "Cannot estimate fees");
return;
}
}
peer = peer_by_id(cmd->ld, id);
if (!peer) {
command_fail(cmd, LIGHTNINGD, "Unknown peer");
return;
}
channel = peer_active_channel(peer);
if (channel) {
command_fail(cmd, LIGHTNINGD, "Peer already %s",
channel_state_name(channel));
return;
}
if (!peer->uncommitted_channel) {
command_fail(cmd, LIGHTNINGD, "Peer not connected");
return;
}
if (peer->uncommitted_channel->fc) {
command_fail(cmd, LIGHTNINGD, "Already funding channel");
return;
}
/* FIXME: Support push_msat? */
fc->push_msat = 0;
fc->channel_flags = OUR_CHANNEL_FLAGS;
if (!wtx_select_utxos(&fc->wtx, *feerate_per_kw,
BITCOIN_SCRIPTPUBKEY_P2WSH_LEN))
return;
assert(fc->wtx.amount <= max_funding_satoshi);
peer->uncommitted_channel->fc = tal_steal(peer->uncommitted_channel, fc);
fc->uc = peer->uncommitted_channel;
msg = towire_opening_funder(NULL,
fc->wtx.amount,
fc->push_msat,
*feerate_per_kw,
fc->wtx.change,
fc->wtx.change_key_index,
fc->channel_flags,
fc->wtx.utxos,
cmd->ld->wallet->bip32_base);
/* Openingd will either succeed, or fail, or tell us the other side
* funded first. */
subd_send_msg(peer->uncommitted_channel->openingd, take(msg));
command_still_pending(cmd);
}
static const struct json_command fund_channel_command = {
"fundchannel",
json_fund_channel,
"Fund channel with {id} using {satoshi} (or 'all') satoshis, at optional {feerate}"
};
AUTODATA(json_command, &fund_channel_command);