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core-lightning/lightningd/dual_open_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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/* This is the lightningd handler for messages to/from various
* dualopend subdaemons. It manages the callbacks and database
* saves and funding tx watching for a channel open */
#include "config.h"
#include <ccan/array_size/array_size.h>
#include <ccan/cast/cast.h>
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <common/blockheight_states.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/psbt_open.h>
#include <common/shutdown_scriptpubkey.h>
#include <common/type_to_string.h>
#include <common/wire_error.h>
#include <connectd/connectd_wiregen.h>
#include <errno.h>
#include <hsmd/capabilities.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel.h>
#include <lightningd/channel_control.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/notification.h>
#include <lightningd/opening_common.h>
#include <lightningd/peer_control.h>
#include <lightningd/peer_fd.h>
#include <lightningd/plugin_hook.h>
#include <openingd/dualopend_wiregen.h>
#include <sodium/randombytes.h>
struct commit_rcvd {
struct channel *channel;
struct channel_id cid;
struct uncommitted_channel *uc;
};
static void channel_disconnect(struct channel *channel,
enum log_level level,
bool reconnect,
const char *desc)
{
log_(channel->log, level, NULL, false, "%s", desc);
channel_cleanup_commands(channel, desc);
channel_fail_transient(channel, "%s: %s",
channel->owner ?
channel->owner->name :
"dualopend-dead",
desc);
}
void channel_unsaved_close_conn(struct channel *channel, const char *why)
{
/* Gotta be unsaved */
assert(channel_unsaved(channel));
log_info(channel->log, "Unsaved peer failed."
" Disconnecting and deleting channel. Reason: %s",
why);
channel_cleanup_commands(channel, why);
assert(channel->owner);
channel_set_owner(channel, NULL);
delete_channel(channel);
}
static void channel_saved_err_broken_reconn(struct channel *channel,
const char *fmt, ...)
{
va_list ap;
const char *errmsg;
/* We only reconnect to 'saved' channel peers */
assert(!channel_unsaved(channel));
va_start(ap, fmt);
errmsg = tal_vfmt(tmpctx, fmt, ap);
va_end(ap);
log_broken(channel->log, "%s", errmsg);
channel_disconnect(channel, LOG_INFORM, true, errmsg);
}
static void channel_err_broken(struct channel *channel,
const char *fmt, ...)
{
va_list ap;
const char *errmsg;
va_start(ap, fmt);
errmsg = tal_vfmt(tmpctx, fmt, ap);
va_end(ap);
if (channel_unsaved(channel)) {
log_broken(channel->log, "%s", errmsg);
channel_unsaved_close_conn(channel, errmsg);
} else
channel_disconnect(channel, LOG_BROKEN, false, errmsg);
}
void json_add_unsaved_channel(struct json_stream *response,
const struct channel *channel)
{
struct amount_msat total;
struct open_attempt *oa;
if (!channel)
return;
/* If we're chatting but no channel, that's shown by connected: True */
if (!channel->open_attempt)
return;
/* If we're calling out to connectd to activate peer to start the
* process, this will be NULL */
if (!channel->owner)
return;
oa = channel->open_attempt;
json_object_start(response, NULL);
json_add_string(response, "state", channel_state_name(channel));
json_add_string(response, "owner", channel->owner->name);
json_add_string(response, "opener", channel->opener == LOCAL ?
"local" : "remote");
json_array_start(response, "status");
for (size_t i = 0; i < ARRAY_SIZE(channel->billboard.permanent); i++) {
if (!channel->billboard.permanent[i])
continue;
json_add_string(response, NULL,
channel->billboard.permanent[i]);
}
if (channel->billboard.transient)
json_add_string(response, NULL, channel->billboard.transient);
json_array_end(response);
/* funding + our_upfront_shutdown only available if we're initiator */
if (oa->role == TX_INITIATOR) {
if (amount_sat_to_msat(&total, oa->funding)) {
json_add_amount_msat_compat(response, total,
"msatoshi_to_us",
"to_us_msat");
/* This will change if peer adds funds */
json_add_amount_msat_compat(response, total,
"msatoshi_total",
"total_msat");
}
}
json_array_start(response, "features");
/* v2 channels assumed to have both static_remotekey + anchor_outputs */
json_add_string(response, NULL, "option_static_remotekey");
json_add_string(response, NULL, "option_anchor_outputs");
json_array_end(response);
json_object_end(response);
}
struct rbf_channel_payload {
struct subd *dualopend;
struct channel *channel;
struct node_id peer_id;
/* Info specific to this RBF */
struct channel_id channel_id;
struct amount_sat their_funding;
u32 funding_feerate_per_kw;
u32 locktime;
/* General info */
u32 feerate_our_max;
u32 feerate_our_min;
/* What's the maximum amount of funding
* this channel can hold */
struct amount_sat channel_max;
/* Returned from hook */
struct amount_sat our_funding;
struct wally_psbt *psbt;
char *err_msg;
};
static void rbf_channel_hook_serialize(struct rbf_channel_payload *payload,
struct json_stream *stream,
struct plugin *plugin)
{
json_object_start(stream, "rbf_channel");
json_add_node_id(stream, "id", &payload->peer_id);
json_add_channel_id(stream, "channel_id", &payload->channel_id);
json_add_amount_sats_deprecated(stream,
"their_funding", "their_funding_msat",
payload->their_funding);
json_add_num(stream, "locktime", payload->locktime);
json_add_num(stream, "feerate_our_max",
payload->feerate_our_max);
json_add_num(stream, "feerate_our_min",
payload->feerate_our_min);
json_add_num(stream, "funding_feerate_per_kw",
payload->funding_feerate_per_kw);
json_add_amount_sat_msat(stream, "channel_max_msat",
payload->channel_max);
json_object_end(stream);
}
/* ~Map of the Territory~
*
* openchannel hook
- reserveinputs feerate [{"amt": amt, "script": ""}] excludecommon=true -> psbt
-> psbt_set
*
* openchannel_changed hook
- psbt --> most recent
-> psbt_set (if same as orig) | complete flag
*
* openchannel_sign hook
- signpsbt psbt -> partially_signed_psbt
-> partially_signed_psbt
*/
struct openchannel2_payload {
struct subd *dualopend;
struct channel *channel;
struct node_id peer_id;
struct channel_id channel_id;
struct amount_sat their_funding;
struct amount_sat dust_limit_satoshis;
struct amount_msat max_htlc_value_in_flight_msat;
struct amount_msat htlc_minimum_msat;
u32 funding_feerate_per_kw;
u32 feerate_our_max;
u32 feerate_our_min;
u32 commitment_feerate_per_kw;
u16 to_self_delay;
u16 max_accepted_htlcs;
u8 channel_flags;
u32 locktime;
u8 *shutdown_scriptpubkey;
/* What's the maximum amount of funding
* this channel can hold */
struct amount_sat channel_max;
/* If they've requested funds, this is their request */
struct amount_sat requested_lease_amt;
u32 lease_blockheight_start;
u32 node_blockheight;
struct amount_sat accepter_funding;
struct wally_psbt *psbt;
const u8 *our_shutdown_scriptpubkey;
struct lease_rates *rates;
char *err_msg;
};
static void openchannel2_hook_serialize(struct openchannel2_payload *payload,
struct json_stream *stream,
struct plugin *plugin)
{
json_object_start(stream, "openchannel2");
json_add_node_id(stream, "id", &payload->peer_id);
json_add_channel_id(stream, "channel_id", &payload->channel_id);
json_add_amount_sats_deprecated(stream, "their_funding", "their_funding_msat",
payload->their_funding);
json_add_amount_sats_deprecated(stream, "dust_limit_satoshis",
"dust_limit_msat",
payload->dust_limit_satoshis);
json_add_amount_msat_only(stream, "max_htlc_value_in_flight_msat",
payload->max_htlc_value_in_flight_msat);
json_add_amount_msat_only(stream, "htlc_minimum_msat",
payload->htlc_minimum_msat);
json_add_num(stream, "funding_feerate_per_kw",
payload->funding_feerate_per_kw);
json_add_num(stream, "commitment_feerate_per_kw",
payload->commitment_feerate_per_kw);
json_add_num(stream, "feerate_our_max",
payload->feerate_our_max);
json_add_num(stream, "feerate_our_min",
payload->feerate_our_min);
json_add_num(stream, "to_self_delay", payload->to_self_delay);
json_add_num(stream, "max_accepted_htlcs", payload->max_accepted_htlcs);
json_add_num(stream, "channel_flags", payload->channel_flags);
json_add_num(stream, "locktime", payload->locktime);
if (tal_bytelen(payload->shutdown_scriptpubkey) != 0)
json_add_hex_talarr(stream, "shutdown_scriptpubkey",
payload->shutdown_scriptpubkey);
json_add_amount_sat_msat(stream, "channel_max_msat",
payload->channel_max);
if (!amount_sat_zero(payload->requested_lease_amt)) {
json_add_amount_sat_msat(stream, "requested_lease_msat",
payload->requested_lease_amt);
json_add_num(stream, "lease_blockheight_start",
payload->lease_blockheight_start);
json_add_num(stream, "node_blockheight",
payload->node_blockheight);
}
json_object_end(stream);
}
struct openchannel2_psbt_payload {
struct subd *dualopend;
struct wally_psbt *psbt;
struct channel *channel;
struct lightningd *ld;
};
static void
openchannel2_changed_hook_serialize(struct openchannel2_psbt_payload *payload,
struct json_stream *stream,
struct plugin *plugin)
{
json_object_start(stream, "openchannel2_changed");
json_add_psbt(stream, "psbt", payload->psbt);
json_add_string(stream, "channel_id",
type_to_string(tmpctx, struct channel_id,
&payload->channel->cid));
json_object_end(stream);
}
static void
openchannel2_sign_hook_serialize(struct openchannel2_psbt_payload *payload,
struct json_stream *stream,
struct plugin *plugin)
{
json_object_start(stream, "openchannel2_sign");
json_add_psbt(stream, "psbt", payload->psbt);
json_add_string(stream, "channel_id",
type_to_string(tmpctx, struct channel_id,
&payload->channel->cid));
json_object_end(stream);
}
static const u8 *hook_extract_shutdown_script(struct subd* dualopend,
const char *buffer,
const jsmntok_t *toks)
{
const u8 *close_to_script;
enum address_parse_result parse_res;
if (!buffer)
return NULL;
const jsmntok_t *t = json_get_member(buffer, toks, "result");
if (!t)
fatal("Plugin must return a 'result'"
"%.*s", toks[0].end - toks[0].start,
buffer + toks[0].start);
if (!json_tok_streq(buffer, t, "continue")) {
char *errmsg = "Client error. Unable to continue";
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL, errmsg)));
return NULL;
}
const jsmntok_t *close_to_tok = json_get_member(buffer, toks, "close_to");
if (!close_to_tok)
return NULL;
parse_res = json_to_address_scriptpubkey(tmpctx, chainparams, buffer,
close_to_tok, &close_to_script);
switch (parse_res) {
case ADDRESS_PARSE_UNRECOGNIZED:
fatal("Plugin returned an invalid response to the"
" openchannel2.close_to hook: %.*s",
t->end - t->start, buffer + t->start);
case ADDRESS_PARSE_WRONG_NETWORK:
fatal("Plugin returned invalid response to the"
" openchannel2.close_to hook: address %s is"
" not on network %s",
tal_hex(NULL, close_to_script),
chainparams->network_name);
case ADDRESS_PARSE_SUCCESS:
return close_to_script;
}
return NULL;
}
static bool
hook_extract_psbt(const tal_t *ctx, struct subd *dualopend, const char *buffer,
const jsmntok_t *toks, char *hook_name,
bool allow_empty,
struct wally_psbt **out)
{
if (!buffer)
fatal("Plugin must return a valid response to %s", hook_name);
const jsmntok_t *t = json_get_member(buffer, toks, "result");
if (!t)
fatal("Plugin must return a 'result' to %s"
"%.*s", hook_name, toks[0].end - toks[0].start,
buffer + toks[0].start);
if (!json_tok_streq(buffer, t, "continue")) {
/* dualopend might have closed if we're on the signed round */
if (dualopend) {
char *errmsg = "Client error. Unable to continue";
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL, errmsg)));
}
return false;
}
const jsmntok_t *psbt_tok = json_get_member(buffer, toks, "psbt");
if (!psbt_tok) {
if (!allow_empty)
fatal("Plugin must return a 'psbt' to a 'continue'd"
"%s %.*s", hook_name,
toks[0].end - toks[0].start,
buffer + toks[0].start);
*out = NULL;
return true;
}
*out = json_to_psbt(ctx, buffer, psbt_tok);
if (!*out)
fatal("Plugin must return a valid 'psbt' to a 'continue'd"
"%s %.*s", hook_name,
toks[0].end - toks[0].start,
buffer + toks[0].start);
return true;
}
/* The field is *always* assumed msats, as that's the unit
* amount we're transitioning our API over to. A 'xxxsat'
* unit will be interpreted correctly, but a value given
* without a unit will always be interpreted as msats */
static bool
hook_extract_amount(struct subd *dualopend,
const char *buffer,
const jsmntok_t *toks,
char *field_name,
struct amount_sat *amount)
{
struct amount_msat msats;
if (!buffer)
return false;
const jsmntok_t *t = json_get_member(buffer, toks, "result");
if (!t)
fatal("Plugin must return a 'result' "
" %.*s", toks[0].end - toks[0].start,
buffer + toks[0].start);
if (!json_tok_streq(buffer, t, "continue")) {
char *errmsg = "Client error. Unable to continue";
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL, errmsg)));
return false;
}
/* If there's no amount_sat field, that's ok */
const jsmntok_t *amt_tok = json_get_member(buffer, toks, field_name);
if (!amt_tok) {
*amount = AMOUNT_SAT(0);
return true;
}
if (!json_to_msat(buffer, amt_tok, &msats))
fatal("Plugin must return a valid '%s' to a 'continue'd"
" %.*s", field_name,
toks[0].end - toks[0].start,
buffer + toks[0].start);
*amount = amount_msat_to_sat_round_down(msats);
return true;
}
static void rbf_channel_remove_dualopend(struct subd *dualopend,
struct rbf_channel_payload *payload)
{
assert(payload->dualopend == dualopend);
payload->dualopend = NULL;
}
static void rbf_channel_hook_cb(struct rbf_channel_payload *payload STEALS)
{
struct subd *dualopend = payload->dualopend;
struct channel *channel = payload->channel;
u8 *msg;
tal_steal(tmpctx, payload);
if (!dualopend)
return;
tal_del_destructor2(dualopend, rbf_channel_remove_dualopend, payload);
if (channel->state != DUALOPEND_AWAITING_LOCKIN) {
log_debug(channel->log,
"rbf_channel hook returned, but channel in state"
" %s", channel_state_name(channel));
msg = towire_dualopend_fail(NULL, "Peer error. Channel"
" not ready for RBF attempt.");
return subd_send_msg(dualopend, take(msg));
}
if (payload->err_msg) {
log_debug(channel->log,
"rbf_channel hook rejects and says '%s'",
payload->err_msg);
msg = towire_dualopend_fail(NULL, payload->err_msg);
return subd_send_msg(dualopend, take(msg));
}
/* Update channel with new open attempt. */
channel->open_attempt = new_channel_open_attempt(channel);
msg = towire_dualopend_got_rbf_offer_reply(NULL,
payload->our_funding,
payload->psbt);
subd_send_msg(dualopend, take(msg));
}
static bool
rbf_channel_hook_deserialize(struct rbf_channel_payload *payload,
const char *buffer,
const jsmntok_t *toks)
{
struct subd *dualopend = payload->dualopend;
struct channel *channel = payload->channel;
if (!dualopend) {
rbf_channel_hook_cb(payload);
return false;
}
/* FIXME: move to new json extraction */
const jsmntok_t *t_result = json_get_member(buffer, toks, "result");
if (!t_result)
fatal("Plugin returned an invalid response to the"
" rbf_channel hook: %.*s",
json_tok_full_len(toks),
json_tok_full(buffer, toks));
if (json_tok_streq(buffer, t_result, "reject")) {
if (json_get_member(buffer, toks, "psbt"))
fatal("Plugin rejected rbf_channel but"
" also set `psbt`");
if (json_get_member(buffer, toks, "our_funding_msat"))
fatal("Plugin rejected rbf_channel but"
" also set `our_funding_msat`");
const jsmntok_t *t_errmsg = json_get_member(buffer, toks,
"error_message");
if (t_errmsg)
payload->err_msg = json_strdup(payload, buffer,
t_errmsg);
else
payload->err_msg = "";
rbf_channel_hook_cb(payload);
return false;
} else if (!json_tok_streq(buffer, t_result, "continue"))
fatal("Plugin returned invalid response to rbf_channel hook:"
" %.*s", json_tok_full_len(toks),
json_tok_full(buffer, toks));
if (!hook_extract_psbt(payload, dualopend, buffer, toks,
"rbf_channel", true, &payload->psbt))
return false;
if (payload->psbt) {
enum tx_role our_role = channel->opener == LOCAL ?
TX_INITIATOR : TX_ACCEPTER;
psbt_add_serials(payload->psbt, our_role);
}
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (payload->psbt && !psbt_has_required_fields(payload->psbt))
fatal("Plugin supplied PSBT that's missing"
" required fields: %s",
type_to_string(tmpctx, struct wally_psbt,
payload->psbt));
if (!hook_extract_amount(dualopend, buffer, toks,
"our_funding_msat", &payload->our_funding))
fatal("Plugin failed to supply our_funding_msat field");
if (payload->psbt
&& amount_sat_zero(payload->our_funding))
fatal("Plugin failed to supply our_funding_msat field");
if (!payload->psbt &&
!amount_sat_zero(payload->our_funding)) {
log_broken(channel->log, "`our_funding_msat` returned"
" but no `psbt` present. %.*s",
json_tok_full_len(toks),
json_tok_full(buffer, toks));
payload->err_msg = "Client error. Unable to continue";
rbf_channel_hook_cb(payload);
return false;
}
return true;
}
/* dualopend dies? Remove dualopend ptr from payload */
static void openchannel2_remove_dualopend(struct subd *dualopend,
struct openchannel2_payload *payload)
{
assert(payload->dualopend == dualopend);
payload->dualopend = NULL;
}
static void
openchannel2_hook_cb(struct openchannel2_payload *payload STEALS)
{
struct subd *dualopend = payload->dualopend;
struct channel *channel = payload->channel;
u32 *our_shutdown_script_wallet_index;
u8 *msg;
/* Our daemon died! */
if (!dualopend)
return;
/* Free payload regardless of what happens next */
tal_steal(tmpctx, payload);
channel = dualopend->channel;
/* Channel open is currently in progress elsewhere! */
if (channel->open_attempt) {
msg = towire_dualopend_fail(NULL, "Already initiated channel"
" open");
log_debug(dualopend->ld->log,
"Our open in progress, denying their offer");
return subd_send_msg(dualopend, take(msg));
}
tal_del_destructor2(dualopend, openchannel2_remove_dualopend, payload);
if (payload->err_msg) {
log_debug(dualopend->ld->log,
"openchannel2 hook rejects and says '%s'",
payload->err_msg);
msg = towire_dualopend_fail(NULL, payload->err_msg);
return subd_send_msg(dualopend, take(msg));
}
/* Determine the wallet index for our_shutdown_scriptpubkey,
* NULL if not found. */
u32 found_wallet_index;
bool is_p2sh;
if (wallet_can_spend(dualopend->ld->wallet,
payload->our_shutdown_scriptpubkey,
&found_wallet_index,
&is_p2sh)) {
our_shutdown_script_wallet_index = tal(tmpctx, u32);
*our_shutdown_script_wallet_index = found_wallet_index;
} else
our_shutdown_script_wallet_index = NULL;
channel->cid = payload->channel_id;
channel->opener = REMOTE;
channel->open_attempt = new_channel_open_attempt(channel);
msg = towire_dualopend_got_offer_reply(NULL,
payload->accepter_funding,
payload->psbt,
payload->our_shutdown_scriptpubkey,
our_shutdown_script_wallet_index,
payload->rates);
subd_send_msg(dualopend, take(msg));
}
static bool
openchannel2_hook_deserialize(struct openchannel2_payload *payload,
const char *buffer,
const jsmntok_t *toks)
{
const u8 *shutdown_script;
const char *err;
struct subd *dualopend = payload->dualopend;
/* If our daemon died, we're done */
if (!dualopend) {
openchannel2_hook_cb(payload);
return false;
}
const jsmntok_t *t_result = json_get_member(buffer, toks, "result");
if (!t_result)
fatal("Plugin returned an invalid response to the"
" openchannel2 hook: %.*s",
json_tok_full_len(toks),
json_tok_full(buffer, toks));
if (json_tok_streq(buffer, t_result, "reject")) {
/* Should not have set any other fields if 'reject'ing */
if (json_get_member(buffer, toks, "close_to"))
fatal("Plugin rejected openchannel2 but"
" also set close_to");
if (json_get_member(buffer, toks, "psbt"))
fatal("Plugin rejected openchannel2 but"
" also set `psbt`");
if (json_get_member(buffer, toks, "our_funding_msat"))
fatal("Plugin rejected openchannel2 but"
" also set `our_funding_psbt`");
const jsmntok_t *t_errmsg = json_get_member(buffer, toks,
"error_message");
if (t_errmsg)
payload->err_msg = json_strdup(payload,
buffer, t_errmsg);
else
payload->err_msg = "";
openchannel2_hook_cb(payload);
return false;
} else if (!json_tok_streq(buffer, t_result, "continue"))
fatal("Plugin returned an invalid response to the"
" openchannel2 hook: %.*s",
json_tok_full_len(toks),
json_tok_full(buffer, toks));
if (!hook_extract_psbt(payload, dualopend, buffer, toks,
"openchannel2", true, &payload->psbt))
return false;
shutdown_script =
hook_extract_shutdown_script(dualopend, buffer, toks);
if (shutdown_script && payload->our_shutdown_scriptpubkey)
log_broken(dualopend->ld->log,
"openchannel2 hook close_to address was"
" already set by other plugin. Ignoring!");
else
payload->our_shutdown_scriptpubkey = shutdown_script;
struct amount_msat fee_base, fee_max_base;
payload->rates = tal(payload, struct lease_rates);
err = json_scan(payload, buffer, toks,
"{lease_fee_base_msat:%"
",lease_fee_basis:%"
",channel_fee_max_base_msat:%"
",channel_fee_max_proportional_thousandths:%"
",funding_weight:%}",
JSON_SCAN(json_to_msat, &fee_base),
JSON_SCAN(json_to_u16,
&payload->rates->lease_fee_basis),
JSON_SCAN(json_to_msat, &fee_max_base),
JSON_SCAN(json_to_u16,
&payload->rates->channel_fee_max_proportional_thousandths),
JSON_SCAN(json_to_u16,
&payload->rates->funding_weight));
/* It's possible they didn't send these back! */
if (err)
payload->rates = tal_free(payload->rates);
/* Convert to u32s */
if (payload->rates &&
!lease_rates_set_lease_fee_msat(payload->rates, fee_base))
fatal("Plugin sent overflowing/non-sat `lease_fee_base_msat`");
if (payload->rates &&
!lease_rates_set_chan_fee_base_msat(payload->rates, fee_max_base))
fatal("Plugin sent overflowing `channel_fee_max_base_msat`");
/* Add a serial_id to everything that doesn't have one yet */
if (payload->psbt)
psbt_add_serials(payload->psbt, TX_ACCEPTER);
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (payload->psbt && !psbt_has_required_fields(payload->psbt))
fatal("Plugin supplied PSBT that's missing required fields. %s",
type_to_string(tmpctx, struct wally_psbt, payload->psbt));
if (!hook_extract_amount(dualopend, buffer, toks,
"our_funding_msat",
&payload->accepter_funding))
fatal("Plugin failed to supply our_funding_msat field");
if (payload->psbt
&& amount_sat_zero(payload->accepter_funding))
fatal("Plugin failed to supply our_funding_msat field");
if (!payload->psbt
&& !amount_sat_zero(payload->accepter_funding)) {
/* Gotta give a PSBT if you set the accepter_funding amount */
/* Let dualopend know we've failed */
payload->err_msg = "Client error. Unable to continue";
openchannel2_hook_cb(payload);
return false;
}
return true;
}
/* dualopend dies? Remove dualopend ptr from payload */
static void
openchannel2_psbt_remove_dualopend(struct subd *dualopend,
struct openchannel2_psbt_payload *payload)
{
assert(payload->dualopend == dualopend);
payload->dualopend = NULL;
}
static bool
openchannel2_changed_deserialize(struct openchannel2_psbt_payload *payload,
const char *buffer, const jsmntok_t *toks)
{
struct subd *dualopend = payload->dualopend;
struct wally_psbt *psbt;
if (!hook_extract_psbt(NULL, dualopend, buffer,
toks, "openchannel2_changed",
false, &psbt))
return false;
/* Add serials to PSBT, before checking for required fields */
psbt_add_serials(psbt, TX_ACCEPTER);
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (!psbt_has_required_fields(psbt))
fatal("Plugin supplied PSBT that's missing required fields. %s",
type_to_string(tmpctx, struct wally_psbt, psbt));
if (payload->psbt)
tal_free(payload->psbt);
payload->psbt = tal_steal(payload, psbt);
return true;
}
static void
openchannel2_changed_hook_cb(struct openchannel2_psbt_payload *payload STEALS)
{
struct subd *dualopend = payload->dualopend;
/* Free payload regardless of what happens next */
tal_steal(tmpctx, payload);
/* If our daemon died, we're done */
if (!dualopend)
return;
tal_del_destructor2(dualopend,
openchannel2_psbt_remove_dualopend,
payload);
subd_send_msg(dualopend,
take(towire_dualopend_psbt_updated(NULL,
payload->psbt)));
}
static bool
openchannel2_signed_deserialize(struct openchannel2_psbt_payload *payload,
const char *buffer, const jsmntok_t *toks)
{
struct subd *dualopend = payload->dualopend;
struct wally_psbt *psbt;
if (!hook_extract_psbt(NULL, dualopend, buffer,
toks, "openchannel2_sign",
false, &psbt))
return false;
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (!psbt_has_required_fields(psbt))
fatal("Plugin supplied PSBT that's missing required fields. %s",
type_to_string(tmpctx, struct wally_psbt, psbt));
/* Verify that inputs/outputs are the same. Note that this is a
* 'de minimus' check -- we just look at serial_ids. If you've
* totally managled the data here but left the serial_ids intact,
* you'll get a failure back from the peer when you send
* commitment sigs */
if (psbt_contribs_changed(payload->psbt, psbt))
fatal("Plugin must not change psbt input/output set. "
"orig: %s. updated: %s",
type_to_string(tmpctx, struct wally_psbt,
payload->psbt),
type_to_string(tmpctx, struct wally_psbt,
psbt));
if (payload->psbt)
tal_free(payload->psbt);
payload->psbt = tal_steal(payload, psbt);
return true;
}
static void
openchannel2_sign_hook_cb(struct openchannel2_psbt_payload *payload STEALS)
{
struct channel *channel = payload->channel;
struct channel_inflight *inflight;
struct bitcoin_txid txid;
u8 *msg;
/* Whatever happens, we free the payload */
tal_steal(tmpctx, payload);
/* Finalize it, if not already. It shouldn't work entirely */
psbt_finalize(payload->psbt);
if (!psbt_side_finalized(payload->psbt, TX_ACCEPTER)) {
log_broken(channel->log,
"Plugin must return a 'psbt' with signatures "
"for their inputs %s",
type_to_string(tmpctx,
struct wally_psbt,
payload->psbt));
msg = towire_dualopend_fail(NULL, "Peer error with PSBT"
" signatures.");
goto send_msg;
}
inflight = channel_current_inflight(channel);
if (!inflight) {
log_broken(channel->log,
"No current channel inflight");
msg = towire_dualopend_fail(NULL, "No current channel inflight");
goto send_msg;
}
/* Check that we've got the same / correct PSBT */
psbt_txid(NULL, payload->psbt, &txid, NULL);
if (!bitcoin_txid_eq(&inflight->funding->outpoint.txid, &txid)) {
log_broken(channel->log,
"PSBT's txid does not match. %s != %s",
type_to_string(tmpctx, struct bitcoin_txid,
&txid),
type_to_string(tmpctx, struct bitcoin_txid,
&inflight->funding->outpoint.txid));
msg = towire_dualopend_fail(NULL, "Peer error with PSBT"
" signatures.");
goto send_msg;
}
/* Now that we've got the signed PSBT, save it */
tal_free(inflight->funding_psbt);
inflight->funding_psbt = tal_steal(inflight,
cast_const(struct wally_psbt *,
payload->psbt));
wallet_inflight_save(payload->ld->wallet, inflight);
channel_watch_funding(payload->ld, channel);
msg = towire_dualopend_send_tx_sigs(NULL, inflight->funding_psbt);
send_msg:
/* Peer's gone away, let's try reconnecting */
if (!payload->dualopend) {
channel_saved_err_broken_reconn(channel,
"dualopend daemon died"
" before signed PSBT returned");
return;
}
tal_del_destructor2(payload->dualopend,
openchannel2_psbt_remove_dualopend,
payload);
/* Send peer our signatures */
subd_send_msg(payload->dualopend, take(msg));
}
REGISTER_PLUGIN_HOOK(openchannel2,
openchannel2_hook_deserialize,
openchannel2_hook_cb,
openchannel2_hook_serialize,
struct openchannel2_payload *);
REGISTER_PLUGIN_HOOK(openchannel2_changed,
openchannel2_changed_deserialize,
openchannel2_changed_hook_cb,
openchannel2_changed_hook_serialize,
struct openchannel2_psbt_payload *);
REGISTER_PLUGIN_HOOK(openchannel2_sign,
openchannel2_signed_deserialize,
openchannel2_sign_hook_cb,
openchannel2_sign_hook_serialize,
struct openchannel2_psbt_payload *);
REGISTER_PLUGIN_HOOK(rbf_channel,
rbf_channel_hook_deserialize,
rbf_channel_hook_cb,
rbf_channel_hook_serialize,
struct rbf_channel_payload *);
static bool feerate_satisfied(struct wally_psbt *psbt,
u32 funding_feerate)
{
struct wally_tx *wtx;
size_t tx_weight;
struct amount_sat fee_paid, expected_fee;
wtx = psbt_final_tx(NULL, psbt);
tx_weight = wally_tx_weight(wtx);
tal_free(wtx);
fee_paid = psbt_compute_fee(psbt);
expected_fee = amount_tx_fee(funding_feerate, tx_weight);
return amount_sat_greater_eq(fee_paid, expected_fee);
}
static struct amount_sat calculate_reserve(struct channel_config *their_config,
struct amount_sat funding_total,
enum side opener)
{
struct amount_sat reserve, dust_limit;
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2
*
* The channel reserve is fixed at 1% of the total channel balance
* rounded down (sum of `funding_satoshis` from `open_channel2`
* and `accept_channel2`) or the `dust_limit_satoshis` from
* `open_channel2`, whichever is greater.
*/
reserve = amount_sat_div(funding_total, 100);
dust_limit = opener == LOCAL ?
chainparams->dust_limit :
their_config->dust_limit;
if (amount_sat_greater(dust_limit, reserve))
return dust_limit;
return reserve;
}
void channel_update_reserve(struct channel *channel,
struct channel_config *their_config,
struct amount_sat funding_total)
{
struct amount_sat reserve;
reserve = calculate_reserve(their_config,
funding_total,
channel->opener);
/* Depending on path, these are disjoint */
their_config->channel_reserve = reserve;
channel->channel_info.their_config.channel_reserve = reserve;
channel->our_config.channel_reserve = reserve;
}
/* Steals fields from uncommitted_channel: returns NULL if can't generate a
* key for this channel (shouldn't happen!). */
static struct channel_inflight *
wallet_update_channel(struct lightningd *ld,
struct channel *channel,
struct bitcoin_tx *remote_commit STEALS,
struct bitcoin_signature *remote_commit_sig,
const struct bitcoin_outpoint *funding,
struct amount_sat total_funding,
struct amount_sat our_funding,
u32 funding_feerate,
struct wally_psbt *psbt STEALS,
const u32 lease_expiry,
struct amount_sat lease_fee,
secp256k1_ecdsa_signature *lease_commit_sig STEALS,
const u32 lease_chan_max_msat,
const u16 lease_chan_max_ppt,
const u32 lease_blockheight_start)
{
struct amount_msat our_msat, lease_fee_msat;
struct channel_inflight *inflight;
if (!amount_sat_to_msat(&our_msat, our_funding)) {
log_broken(channel->log, "Unable to convert funds");
return NULL;
}
if (!amount_sat_to_msat(&lease_fee_msat, lease_fee)) {
log_broken(channel->log, "Unable to convert 'lease_fee'");
return NULL;
}
assert(channel->unsaved_dbid == 0);
assert(channel->dbid != 0);
channel->funding = *funding;
channel->funding_sats = total_funding;
channel->our_funds = our_funding;
channel->our_msat = our_msat;
channel->push = lease_fee_msat;
channel->msat_to_us_min = our_msat;
channel->msat_to_us_max = our_msat;
channel->lease_expiry = lease_expiry;
channel->htlc_minimum_msat = channel->channel_info.their_config.htlc_minimum;
channel->htlc_maximum_msat = htlc_max_possible_send(channel);
tal_free(channel->lease_commit_sig);
channel->lease_commit_sig = tal_steal(channel, lease_commit_sig);
channel->lease_chan_max_msat = lease_chan_max_msat;
channel->lease_chan_max_ppt = lease_chan_max_ppt;
tal_free(channel->blockheight_states);
channel->blockheight_states = new_height_states(channel,
channel->opener,
&lease_blockheight_start);
channel_set_last_tx(channel,
tal_steal(channel, remote_commit),
remote_commit_sig,
TX_CHANNEL_UNILATERAL);
/* Update in database */
wallet_channel_save(ld->wallet, channel);
/* Add open attempt to channel's inflights */
inflight = new_inflight(channel,
&channel->funding,
funding_feerate,
channel->funding_sats,
channel->our_funds,
psbt,
channel->last_tx,
channel->last_sig,
channel->lease_expiry,
channel->lease_commit_sig,
channel->lease_chan_max_msat,
channel->lease_chan_max_ppt,
lease_blockheight_start,
channel->push);
wallet_inflight_add(ld->wallet, inflight);
return inflight;
}
/* Returns NULL if can't generate a key for this channel (Shouldn't happen) */
static struct channel_inflight *
wallet_commit_channel(struct lightningd *ld,
struct channel *channel,
struct bitcoin_tx *remote_commit,
struct bitcoin_signature *remote_commit_sig,
const struct bitcoin_outpoint *funding,
struct amount_sat total_funding,
struct amount_sat our_funding,
struct channel_info *channel_info,
u32 funding_feerate,
u32 commitment_feerate,
const u8 *our_upfront_shutdown_script,
const u8 *remote_upfront_shutdown_script,
struct wally_psbt *psbt STEALS,
const u32 lease_blockheight_start,
const u32 lease_expiry,
const struct amount_sat lease_fee,
secp256k1_ecdsa_signature *lease_commit_sig STEALS,
const u32 lease_chan_max_msat,
const u16 lease_chan_max_ppt)
{
struct amount_msat our_msat, lease_fee_msat;
struct channel_inflight *inflight;
bool any_active = peer_any_active_channel(channel->peer, NULL);
if (!amount_sat_to_msat(&our_msat, our_funding)) {
log_broken(channel->log, "Unable to convert funds");
return NULL;
}
if (!amount_sat_to_msat(&lease_fee_msat, lease_fee)) {
log_broken(channel->log, "Unable to convert lease fee");
return NULL;
}
/* Get a key to use for closing outputs from this tx */
channel->final_key_idx = wallet_get_newindex(ld);
if (channel->final_key_idx == -1) {
log_broken(channel->log, "Can't get final key index");
return NULL;
}
/* This is a new channel_info.their_config so set its ID to 0 */
channel_info->their_config.id = 0;
/* old_remote_per_commit not valid yet, copy valid one. */
channel_info->old_remote_per_commit = channel_info->remote_per_commit;
/* Promote the unsaved_dbid to the dbid */
assert(channel->unsaved_dbid != 0);
channel->dbid = channel->unsaved_dbid;
channel->unsaved_dbid = 0;
channel->funding = *funding;
channel->funding_sats = total_funding;
channel->our_funds = our_funding;
channel->our_msat = our_msat;
channel->push = lease_fee_msat;
channel->msat_to_us_min = our_msat;
channel->msat_to_us_max = our_msat;
channel->last_tx = tal_steal(channel, remote_commit);
channel->last_sig = *remote_commit_sig;
channel->last_tx_type = TX_CHANNEL_UNILATERAL;
channel->channel_info = *channel_info;
channel->fee_states = new_fee_states(channel,
channel->opener,
&commitment_feerate);
channel->min_possible_feerate = commitment_feerate;
channel->max_possible_feerate = commitment_feerate;
channel->scb = tal(channel, struct scb_chan);
channel->scb->id = channel->dbid;
channel->scb->addr = channel->peer->addr;
channel->scb->node_id = channel->peer->id;
channel->scb->funding = *funding;
channel->scb->cid = channel->cid;
channel->scb->funding_sats = total_funding;
channel->scb->type = channel_type_dup(channel->scb, channel->type);
if (our_upfront_shutdown_script)
channel->shutdown_scriptpubkey[LOCAL]
= tal_steal(channel, our_upfront_shutdown_script);
else
channel->shutdown_scriptpubkey[LOCAL]
= p2wpkh_for_keyidx(channel, channel->peer->ld,
channel->final_key_idx);
/* Can't have gotten their alias for this channel yet. */
channel->alias[REMOTE] = NULL;
/* We do generate one ourselves however. */
channel->alias[LOCAL] = tal(channel, struct short_channel_id);
randombytes_buf(channel->alias[LOCAL], sizeof(struct short_channel_id));
channel->remote_upfront_shutdown_script
= tal_steal(channel, remote_upfront_shutdown_script);
channel->state_change_cause = (channel->opener == LOCAL) ?
REASON_USER : REASON_REMOTE;
/* If we're fundee, could be a little before this
* in theory, but it's only used for timing out. */
channel->first_blocknum = get_block_height(ld->topology);
/* Update lease info for channel */
channel->blockheight_states = new_height_states(channel,
channel->opener,
&lease_blockheight_start);
channel->lease_expiry = lease_expiry;
tal_free(channel->lease_commit_sig);
channel->lease_commit_sig = tal_steal(channel, lease_commit_sig);
channel->lease_chan_max_msat = lease_chan_max_msat;
channel->lease_chan_max_ppt = lease_chan_max_ppt;
channel->htlc_minimum_msat = channel_info->their_config.htlc_minimum;
channel->htlc_maximum_msat = htlc_max_possible_send(channel);
/* Now we finally put it in the database. */
wallet_channel_insert(ld->wallet, channel);
/* Open attempt to channel's inflights */
inflight = new_inflight(channel,
&channel->funding,
funding_feerate,
channel->funding_sats,
channel->our_funds,
psbt,
channel->last_tx,
channel->last_sig,
channel->lease_expiry,
channel->lease_commit_sig,
channel->lease_chan_max_msat,
channel->lease_chan_max_ppt,
lease_blockheight_start,
channel->push);
wallet_inflight_add(ld->wallet, inflight);
/* We might have disconnected and decided we didn't need to
* reconnect because no channels are active. But the subd
* just made it active! */
if (!any_active && channel->peer->connected == PEER_DISCONNECTED) {
try_reconnect(channel->peer, channel->peer, 1,
&channel->peer->addr);
}
return inflight;
}
static void handle_peer_wants_to_close(struct subd *dualopend,
const u8 *msg)
{
u8 *scriptpubkey;
struct lightningd *ld = dualopend->ld;
struct channel *channel = dualopend->channel;
char *errmsg;
bool anysegwit = feature_negotiated(ld->our_features,
channel->peer->their_features,
OPT_SHUTDOWN_ANYSEGWIT);
bool anchors = feature_negotiated(ld->our_features,
channel->peer->their_features,
OPT_ANCHOR_OUTPUTS)
|| feature_negotiated(ld->our_features,
channel->peer->their_features,
OPT_ANCHORS_ZERO_FEE_HTLC_TX);
/* We shouldn't get this message while we're waiting to finish */
if (channel_unsaved(channel)) {
log_broken(dualopend->ld->log, "Channel in wrong state for"
" shutdown, still has uncommitted"
" channel pending.");
errmsg = "Channel not established yet, shutdown invalid";
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL, errmsg)));
return;
}
if (!fromwire_dualopend_got_shutdown(channel, msg, &scriptpubkey)) {
channel_internal_error(channel,
"Bad DUALOPEND_GOT_SHUTDOWN: %s",
tal_hex(msg, msg));
return;
}
tal_free(channel->shutdown_scriptpubkey[REMOTE]);
channel->shutdown_scriptpubkey[REMOTE] = scriptpubkey;
/* BOLT #2:
*
* A receiving node:
*...
* - if the `scriptpubkey` is not in one of the above forms:
* - SHOULD send a `warning`
*/
if (!valid_shutdown_scriptpubkey(scriptpubkey, anysegwit, anchors)) {
u8 *warning = towire_warningfmt(NULL,
&channel->cid,
"Bad shutdown scriptpubkey %s",
tal_hex(tmpctx, scriptpubkey));
/* Get connectd to send warning, and kill subd. */
subd_send_msg(ld->connectd,
take(towire_connectd_peer_final_msg(NULL,
&channel->peer->id,
channel->peer->connectd_counter,
warning)));
channel_fail_transient(channel, "Bad shutdown scriptpubkey %s",
tal_hex(tmpctx, scriptpubkey));
return;
}
/* If we weren't already shutting down, we are now */
if (channel->state != CHANNELD_SHUTTING_DOWN)
channel_set_state(channel,
channel->state,
CHANNELD_SHUTTING_DOWN,
REASON_REMOTE,
"Peer closes channel");
/* TODO(cdecker) Selectively save updated fields to DB */
wallet_channel_save(ld->wallet, channel);
/* Now we send back our scriptpubkey to close with */
subd_send_msg(dualopend, take(towire_dualopend_send_shutdown(NULL,
channel->shutdown_scriptpubkey[LOCAL])));
}
static void handle_channel_closed(struct subd *dualopend,
const int *fds,
const u8 *msg)
{
struct peer_fd *peer_fd;
struct channel *channel = dualopend->channel;
if (!fromwire_dualopend_shutdown_complete(msg)) {
channel_internal_error(dualopend->channel,
"Bad DUALOPEND_SHUTDOWN_COMPLETE: %s",
tal_hex(msg, msg));
close(fds[0]);
close(fds[1]);
return;
}
peer_fd = new_peer_fd_arr(tmpctx, fds);
peer_start_closingd(channel, peer_fd);
channel_set_state(channel,
CHANNELD_SHUTTING_DOWN,
CLOSINGD_SIGEXCHANGE,
REASON_UNKNOWN,
"Start closingd");
}
static void handle_local_private_channel(struct subd *dualopend,
const u8 *msg)
{
struct amount_sat capacity;
u8 *features;
if (!fromwire_dualopend_local_private_channel(msg, msg, &capacity,
&features)) {
channel_internal_error(dualopend->channel,
"bad dualopend_local_private_channel %s",
tal_hex(msg, msg));
return;
}
tell_gossipd_local_private_channel(dualopend->ld, dualopend->channel,
capacity, features);
}
struct channel_send {
const struct wally_tx *wtx;
struct channel *channel;
const char *err_msg;
};
static void handle_tx_broadcast(struct channel_send *cs)
{
struct lightningd *ld = cs->channel->peer->ld;
const struct wally_tx *wtx = cs->wtx;
struct channel *channel = cs->channel;
struct command *cmd = channel->openchannel_signed_cmd;
struct json_stream *response;
struct bitcoin_txid txid;
struct amount_sat unused;
int num_utxos;
/* This might have spent UTXOs from our wallet */
num_utxos = wallet_extract_owned_outputs(ld->wallet,
wtx, NULL,
&unused);
if (num_utxos)
wallet_transaction_add(ld->wallet, wtx, 0, 0);
if (cmd) {
response = json_stream_success(cmd);
wally_txid(wtx, &txid);
json_add_hex_talarr(response, "tx", linearize_wtx(tmpctx, wtx));
json_add_txid(response, "txid", &txid);
json_add_channel_id(response, "channel_id", &channel->cid);
was_pending(command_success(cmd, response));
cs->channel->openchannel_signed_cmd = NULL;
}
}
static void check_utxo_block(struct bitcoind *bitcoind UNUSED,
const struct bitcoin_tx_output *txout,
void *arg)
{
struct channel_send *cs = arg;
struct command *cmd = cs->channel->openchannel_signed_cmd;
const struct wally_tx *wtx = cs->wtx;
/* note: if this tx has been included in a block *and spent*
* then this will also fail... */
if (!txout) {
if (cmd) {
was_pending(command_fail(cmd,
FUNDING_BROADCAST_FAIL,
"Error broadcasting funding "
"tx: %s. Unsent tx discarded "
"%s.",
cs->err_msg,
type_to_string(tmpctx,
struct wally_tx,
wtx)));
cs->channel->openchannel_signed_cmd = NULL;
}
log_unusual(cs->channel->log,
"Error broadcasting funding "
"tx: %s. Unsent tx discarded "
"%s.",
cs->err_msg,
type_to_string(tmpctx, struct wally_tx, wtx));
} else
handle_tx_broadcast(cs);
tal_free(cs);
}
static void sendfunding_done(struct bitcoind *bitcoind UNUSED,
bool success, const char *msg,
struct channel_send *cs)
{
struct lightningd *ld = cs->channel->peer->ld;
struct channel *channel = cs->channel;
struct command *cmd = channel->openchannel_signed_cmd;
if (!cmd && channel->opener == LOCAL)
log_unusual(channel->log,
"No outstanding command for channel %s,"
" funding sent was success? %d",
type_to_string(tmpctx, struct channel_id,
&channel->cid),
success);
if (success) {
handle_tx_broadcast(cs);
tal_free(cs);
} else {
/* If the tx was mined into a block, it's possible
* that the broadcast would fail. Verify that's not
* the case here. */
cs->err_msg = tal_strdup(cs, msg);
bitcoind_getutxout(ld->topology->bitcoind,
&channel->funding,
check_utxo_block,
cs);
}
}
static void send_funding_tx(struct channel *channel,
const struct wally_tx *wtx TAKES)
{
struct lightningd *ld = channel->peer->ld;
struct channel_send *cs;
struct bitcoin_txid txid;
cs = tal(channel, struct channel_send);
cs->channel = channel;
if (taken(wtx))
cs->wtx = tal_steal(cs, wtx);
else {
tal_wally_start();
wally_tx_clone_alloc(wtx, 0,
cast_const2(struct wally_tx **,
&cs->wtx));
tal_wally_end_onto(cs,
cast_const(struct wally_tx *,
cs->wtx), struct wally_tx);
}
wally_txid(wtx, &txid);
log_debug(channel->log,
"Broadcasting funding tx %s for channel %s. %s",
type_to_string(tmpctx, struct bitcoin_txid, &txid),
type_to_string(tmpctx, struct channel_id, &channel->cid),
type_to_string(tmpctx, struct wally_tx, cs->wtx));
bitcoind_sendrawtx(ld->topology->bitcoind,
tal_hex(tmpctx, linearize_wtx(tmpctx, cs->wtx)),
sendfunding_done, cs);
}
static void handle_peer_tx_sigs_sent(struct subd *dualopend,
const int *fds,
const u8 *msg)
{
struct channel *channel = dualopend->channel;
struct channel_inflight *inflight;
const struct wally_tx *wtx;
if (!fromwire_dualopend_tx_sigs_sent(msg)) {
channel_internal_error(channel,
"Bad WIRE_DUALOPEND_TX_SIGS_SENT: %s",
tal_hex(tmpctx, msg));
return;
}
inflight = channel_current_inflight(channel);
if (!inflight) {
channel_internal_error(channel,
"No inflight found for channel %s",
type_to_string(tmpctx, struct channel,
channel));
return;
}
/* Once we've sent our sigs to the peer, we're fine
* to broadcast the transaction, even if they haven't
* sent us their tx-sigs yet. They're not allowed to
* send us funding-locked until their tx-sigs has been
* received, but that's no reason not to broadcast.
* Note this only happens if we're the only input-er */
if (psbt_finalize(inflight->funding_psbt) &&
!inflight->tx_broadcast) {
inflight->tx_broadcast = true;
wtx = psbt_final_tx(NULL, inflight->funding_psbt);
if (!wtx) {
channel_internal_error(channel,
"Unable to extract final tx"
" from PSBT %s",
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
return;
}
/* Saves the now finalized version of the psbt */
wallet_inflight_save(dualopend->ld->wallet, inflight);
send_funding_tx(channel, take(wtx));
/* Must be in an "init" state */
assert(channel->state == DUALOPEND_OPEN_INIT
|| channel->state == DUALOPEND_AWAITING_LOCKIN);
channel_set_state(channel, channel->state,
DUALOPEND_AWAITING_LOCKIN,
REASON_UNKNOWN,
"Sigs exchanged, waiting for lock-in");
/* Mimic the old behavior, notify a channel has been opened,
* for the accepter side */
if (channel->opener == REMOTE)
/* Tell plugins about the success */
notify_channel_opened(dualopend->ld,
&channel->peer->id,
&channel->funding_sats,
&channel->funding.txid,
&channel->remote_funding_locked);
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2
* The receiving node: ...
* - MUST fail the channel if:
* - the `witness_stack` weight lowers the
* effective `feerate` below the agreed upon
* transaction `feerate`
*/
if (!feerate_satisfied(inflight->funding_psbt,
inflight->funding->feerate)) {
char *errmsg = tal_fmt(tmpctx,
"Witnesses lower effective"
" feerate below agreed upon rate"
" of %dperkw. Failing channel."
" Offending PSBT: %s",
inflight->funding->feerate,
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
/* Notify the peer we're failing */
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL, errmsg)));
}
}
}
static void handle_dry_run_finished(struct subd *dualopend, const u8 *msg)
{
struct json_stream *response;
struct channel_id c_id;
struct channel *channel = dualopend->channel;
struct command *cmd;
struct lease_rates *rates;
struct amount_sat their_funding, our_funding;
assert(channel->open_attempt);
cmd = channel->open_attempt->cmd;
channel->open_attempt->cmd = NULL;
if (!fromwire_dualopend_dry_run(msg, msg, &c_id,
&our_funding,
&their_funding,
&rates)) {
channel_internal_error(channel,
"Bad WIRE_DUALOPEND_DRY_RUN_FINISHED: %s",
tal_hex(msg, msg));
return;
}
/* Free up this open attempt */
channel->open_attempt = tal_free(channel->open_attempt);
response = json_stream_success(cmd);
json_add_amount_sat_msat(response, "our_funding_msat", our_funding);
json_add_amount_sat_msat(response, "their_funding_msat", their_funding);
if (rates) {
json_add_lease_rates(response, rates);
/* As a convenience, add a hexstring version of this data */
json_add_string(response, "compact_lease",
lease_rates_tohex(tmpctx, rates));
}
was_pending(command_success(cmd, response));
}
static void handle_peer_locked(struct subd *dualopend, const u8 *msg)
{
struct pubkey remote_per_commit;
struct channel *channel = dualopend->channel;
if (!fromwire_dualopend_peer_locked(msg, &remote_per_commit)) {
channel_internal_error(channel,
"Bad WIRE_DUALOPEND_PEER_LOCKED: %s",
tal_hex(msg, msg));
return;
}
/* Updates channel with the next per-commit point etc, calls
* channel_internal_error on failure */
if (!channel_on_funding_locked(channel, &remote_per_commit))
return;
/* Remember that we got the lock-in */
wallet_channel_save(dualopend->ld->wallet, channel);
}
static void handle_channel_locked(struct subd *dualopend,
const int *fds,
const u8 *msg)
{
struct channel *channel = dualopend->channel;
struct peer_fd *peer_fd;
if (!fromwire_dualopend_channel_locked(msg)) {
channel_internal_error(channel,
"Bad WIRE_DUALOPEND_CHANNEL_LOCKED: %s",
tal_hex(msg, msg));
return;
}
peer_fd = new_peer_fd_arr(tmpctx, fds);
assert(channel->scid);
assert(channel->remote_funding_locked);
/* This can happen if we missed their sigs, for some reason */
if (channel->state != DUALOPEND_AWAITING_LOCKIN)
log_debug(channel->log, "Lockin complete, but state %s",
channel_state_name(channel));
channel_set_state(channel,
channel->state,
CHANNELD_NORMAL,
REASON_UNKNOWN,
"Lockin complete");
channel_record_open(channel);
/* Empty out the inflights */
wallet_channel_clear_inflights(dualopend->ld->wallet, channel);
/* FIXME: LND sigs/update_fee msgs? */
peer_start_channeld(channel, peer_fd, NULL, false, NULL);
return;
}
void dualopen_tell_depth(struct subd *dualopend,
struct channel *channel,
const struct bitcoin_txid *txid,
u32 depth)
{
const u8 *msg;
u32 to_go;
if (depth < channel->minimum_depth) {
to_go = channel->minimum_depth - depth;
} else
to_go = 0;
/* Are we there yet? */
if (to_go == 0) {
assert(channel->scid);
assert(bitcoin_txid_eq(&channel->funding.txid, txid));
channel_set_billboard(channel, false,
tal_fmt(tmpctx, "Funding depth reached"
" %d confirmations, alerting peer"
" we're locked-in.",
to_go));
msg = towire_dualopend_depth_reached(NULL, depth);
subd_send_msg(dualopend, take(msg));
} else
channel_set_billboard(channel, false,
tal_fmt(tmpctx, "Funding needs %d more"
" confirmations for lockin.",
to_go));
}
static void rbf_got_offer(struct subd *dualopend, const u8 *msg)
{
/* We expect the channel to still exist?! */
struct channel *channel;
struct rbf_channel_payload *payload;
channel = dualopend->channel;
payload = tal(dualopend, struct rbf_channel_payload);
payload->dualopend = dualopend;
payload->channel = channel;
if (!fromwire_dualopend_got_rbf_offer(msg,
&payload->channel_id,
&payload->their_funding,
&payload->funding_feerate_per_kw,
&payload->locktime)) {
channel_internal_error(channel,
"Bad WIRE_DUALOPEND_GOT_RBF_OFFER: %s",
tal_hex(msg, msg));
return;
}
/* There's currently another attempt in progress? */
if (channel->open_attempt) {
log_debug(channel->log,
"RBF attempted while previous attempt"
" is still in progress");
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL,
"Error. Already negotiation"
" in progress")));
return;
}
assert(channel_id_eq(&channel->cid, &payload->channel_id));
/* Fill in general channel info from channel */
payload->peer_id = channel->peer->id;
payload->feerate_our_max = feerate_max(dualopend->ld, NULL);
payload->feerate_our_min = feerate_min(dualopend->ld, NULL);
/* Set our contributions to empty, in case there is no plugin */
payload->our_funding = AMOUNT_SAT(0);
payload->psbt = NULL;
/* No error message known (yet) */
payload->err_msg = NULL;
payload->channel_max = chainparams->max_funding;
if (feature_negotiated(dualopend->ld->our_features,
channel->peer->their_features,
OPT_LARGE_CHANNELS))
payload->channel_max = AMOUNT_SAT(UINT_MAX);
tal_add_destructor2(dualopend, rbf_channel_remove_dualopend, payload);
plugin_hook_call_rbf_channel(dualopend->ld, payload);
}
static void accepter_got_offer(struct subd *dualopend,
struct channel *channel,
const u8 *msg)
{
struct openchannel2_payload *payload;
if (channel->open_attempt) {
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL,
"Already initiated channel open")));
return;
}
payload = tal(dualopend, struct openchannel2_payload);
payload->dualopend = dualopend;
payload->channel = channel;
payload->psbt = NULL;
payload->accepter_funding = AMOUNT_SAT(0);
payload->our_shutdown_scriptpubkey = NULL;
payload->peer_id = channel->peer->id;
payload->err_msg = NULL;
if (!fromwire_dualopend_got_offer(payload, msg,
&payload->channel_id,
&payload->their_funding,
&payload->dust_limit_satoshis,
&payload->max_htlc_value_in_flight_msat,
&payload->htlc_minimum_msat,
&payload->funding_feerate_per_kw,
&payload->commitment_feerate_per_kw,
&payload->to_self_delay,
&payload->max_accepted_htlcs,
&payload->channel_flags,
&payload->locktime,
&payload->shutdown_scriptpubkey,
&payload->requested_lease_amt,
&payload->lease_blockheight_start)) {
channel_internal_error(channel, "Bad DUALOPEND_GOT_OFFER: %s",
tal_hex(tmpctx, msg));
return;
}
/* As a convenience to the plugin, we provide our current known
* min + max feerates. Ideally, the plugin will fail to
* contribute funds if the peer's feerate range is outside of
* this acceptable range, but we delegate that decision to
* the plugin */
payload->feerate_our_min = feerate_min(dualopend->ld, NULL);
payload->feerate_our_max = feerate_max(dualopend->ld, NULL);
payload->node_blockheight = get_block_height(dualopend->ld->topology);
payload->channel_max = chainparams->max_funding;
if (feature_negotiated(dualopend->ld->our_features,
channel->peer->their_features,
OPT_LARGE_CHANNELS))
payload->channel_max = AMOUNT_SAT(UINT64_MAX);
tal_add_destructor2(dualopend, openchannel2_remove_dualopend, payload);
plugin_hook_call_openchannel2(dualopend->ld, payload);
}
static void handle_peer_tx_sigs_msg(struct subd *dualopend,
const u8 *msg)
{
struct wally_psbt *psbt;
const struct wally_tx *wtx;
struct lightningd *ld = dualopend->ld;
struct channel *channel = dualopend->channel;
struct channel_inflight *inflight;
if (!fromwire_dualopend_funding_sigs(tmpctx, msg, &psbt)) {
channel_internal_error(channel,
"Bad DUALOPEND_FUNDING_SIGS: %s",
tal_hex(tmpctx, msg));
return;
}
inflight = channel_current_inflight(channel);
if (!inflight) {
channel_internal_error(channel,
"No inflight found for channel %s",
type_to_string(tmpctx, struct channel,
channel));
return;
}
/* Save that we've gotten their sigs. Sometimes
* the peer doesn't send any sigs (no inputs), otherwise
* we could just check the PSBT was finalized */
inflight->remote_tx_sigs = true;
tal_wally_start();
if (wally_psbt_combine(inflight->funding_psbt, psbt) != WALLY_OK) {
channel_internal_error(channel,
"Unable to combine PSBTs: %s, %s",
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt),
type_to_string(tmpctx,
struct wally_psbt,
psbt));
tal_wally_end(inflight->funding_psbt);
return;
}
tal_wally_end(inflight->funding_psbt);
wallet_inflight_save(ld->wallet, inflight);
/* It's possible we haven't sent them our (empty) tx-sigs yet,
* but we should be sending it soon... */
if (psbt_finalize(cast_const(struct wally_psbt *,
inflight->funding_psbt))
&& !inflight->tx_broadcast) {
inflight->tx_broadcast = true;
/* Saves the now finalized version of the psbt */
wallet_inflight_save(ld->wallet, inflight);
wtx = psbt_final_tx(NULL, inflight->funding_psbt);
if (!wtx) {
channel_internal_error(channel,
"Unable to extract final tx"
" from PSBT %s",
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
return;
}
send_funding_tx(channel, take(wtx));
assert(channel->state == DUALOPEND_OPEN_INIT
/* We might be reconnecting */
|| channel->state == DUALOPEND_AWAITING_LOCKIN);
channel_set_state(channel, channel->state,
DUALOPEND_AWAITING_LOCKIN,
REASON_UNKNOWN,
"Sigs exchanged, waiting for lock-in");
/* Mimic the old behavior, notify a channel has been opened,
* for the accepter side */
if (channel->opener == REMOTE)
/* Tell plugins about the success */
notify_channel_opened(dualopend->ld,
&channel->peer->id,
&channel->funding_sats,
&channel->funding.txid,
&channel->remote_funding_locked);
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2
* The receiving node: ...
* - MUST fail the channel if:
* - the `witness_stack` weight lowers the
* effective `feerate` below the agreed upon
* transaction `feerate`
*/
if (!feerate_satisfied(inflight->funding_psbt,
inflight->funding->feerate)) {
char *errmsg = tal_fmt(tmpctx,
"Witnesses lower effective"
" feerate below agreed upon rate"
" of %dperkw. Failing channel."
" Offending PSBT: %s",
inflight->funding->feerate,
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
/* Notify the peer we're failing */
subd_send_msg(dualopend,
take(towire_dualopend_fail(NULL, errmsg)));
}
}
/* Send notification with peer's signed PSBT */
notify_openchannel_peer_sigs(ld, &channel->cid,
inflight->funding_psbt);
}
static bool verify_option_will_fund_signature(struct peer *peer,
struct pubkey *funding_pubkey,
u32 lease_expiry,
u32 chan_fee_msat,
u16 chan_fee_ppt,
const secp256k1_ecdsa_signature *sig)
{
struct pubkey their_pubkey;
struct sha256 sha;
int ret;
lease_rates_get_commitment(funding_pubkey, lease_expiry,
chan_fee_msat, chan_fee_ppt,
&sha);
if (!pubkey_from_node_id(&their_pubkey, &peer->id)) {
log_broken(peer->ld->log,
"Unable to extract pubkey from peer's node id %s",
type_to_string(tmpctx, struct node_id, &peer->id));
return false;
}
ret = secp256k1_ecdsa_verify(secp256k1_ctx, sig, sha.u.u8,
&their_pubkey.pubkey);
return ret == 1;
}
static void handle_validate_lease(struct subd *dualopend,
const u8 *msg)
{
const secp256k1_ecdsa_signature sig;
u16 chan_fee_max_ppt;
u32 chan_fee_max_base_msat, lease_expiry;
struct pubkey their_pubkey;
struct channel *chan;
char *err_msg;
if (!fromwire_dualopend_validate_lease(msg,
cast_const(secp256k1_ecdsa_signature *, &sig),
&lease_expiry,
&chan_fee_max_base_msat,
&chan_fee_max_ppt,
&their_pubkey)) {
channel_internal_error(dualopend->channel,
"Bad DUALOPEND_VALIDATE_LEASE: %s",
tal_hex(tmpctx, msg));
return;
}
assert(dualopend->channel);
chan = dualopend->channel;
if (!verify_option_will_fund_signature(chan->peer, &their_pubkey,
lease_expiry,
chan_fee_max_base_msat,
chan_fee_max_ppt,
&sig))
err_msg = "Unable to verify sig";
else
err_msg = NULL;
subd_send_msg(dualopend,
take(towire_dualopend_validate_lease_reply(NULL, err_msg)));
}
static void handle_validate_rbf(struct subd *dualopend,
const u8 *msg)
{
struct wally_psbt *candidate_psbt;
struct channel_inflight *inflight;
struct channel *channel = dualopend->channel;
bool *inputs_present;
struct amount_sat candidate_fee, last_fee;
if (!fromwire_dualopend_rbf_validate(tmpctx, msg,
&candidate_psbt)) {
channel_internal_error(channel,
"Bad DUALOPEND_RBF_VALIDATE: %s",
tal_hex(tmpctx, msg));
return;
}
inputs_present = tal_arr(tmpctx, bool, candidate_psbt->num_inputs);
memset(inputs_present, true, tal_bytelen(inputs_present));
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
* The receiving node: ...
* - MUST fail the negotiation if: ...
* - the transaction does not share a common input with
* all previous funding transactions
*/
list_for_each(&channel->inflights, inflight, list) {
/* Remove every non-matching input from set */
for (size_t i = 0; i < candidate_psbt->num_inputs; i++) {
struct wally_tx_input *input =
&candidate_psbt->tx->inputs[i];
struct bitcoin_outpoint outpoint;
wally_tx_input_get_outpoint(input, &outpoint);
if (!psbt_has_input(inflight->funding_psbt,
&outpoint))
inputs_present[i] = false;
}
}
/* Are there any inputs that were present on all txs? */
if (memeqzero(inputs_present, tal_bytelen(inputs_present))) {
char *errmsg;
inflight = list_tail(&channel->inflights,
struct channel_inflight,
list);
assert(inflight);
errmsg = tal_fmt(tmpctx, "No overlapping input"
" present. New: %s, last: %s",
type_to_string(tmpctx,
struct wally_psbt,
candidate_psbt),
type_to_string(tmpctx,
struct wally_psbt,
inflight->funding_psbt));
msg = towire_dualopend_fail(NULL, errmsg);
goto send_msg;
}
candidate_fee = psbt_compute_fee(candidate_psbt);
inflight = list_tail(&channel->inflights,
struct channel_inflight,
list);
assert(inflight);
last_fee = psbt_compute_fee(inflight->funding_psbt);
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
* The receiving node: ...
* - if is an RBF attempt:
* - MUST fail the negotiation if:
* - the transaction's total fees is less than the last
* successfully negotiated transaction's fees
*/
if (!amount_sat_greater(candidate_fee, last_fee)) {
char *errmsg = tal_fmt(tmpctx, "Proposed funding tx fee (%s)"
" less than/equal to last (%s)",
type_to_string(tmpctx,
struct amount_sat,
&candidate_fee),
type_to_string(tmpctx,
struct amount_sat,
&last_fee));
msg = towire_dualopend_fail(NULL, errmsg);
goto send_msg;
}
msg = towire_dualopend_rbf_valid(NULL);
send_msg:
subd_send_msg(channel->owner, take(msg));
}
static struct command_result *
json_openchannel_abort(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct channel_id *cid;
struct channel *channel;
u8 *msg;
if (!param(cmd, buffer, params,
p_req("channel_id", param_channel_id, &cid),
NULL))
return command_param_failed();
channel = channel_by_cid(cmd->ld, cid);
if (!channel)
return command_fail(cmd, FUNDING_UNKNOWN_CHANNEL,
"Unknown channel %s",
type_to_string(tmpctx, struct channel_id,
cid));
if (!channel->owner)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected");
if (!channel->open_attempt) {
if (list_empty(&channel->inflights))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Channel open not in progress");
return command_fail(cmd, FUNDING_STATE_INVALID,
"Sigs already exchanged, can't cancel");
}
if (channel->open_attempt->cmd)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Another openchannel command"
" is in progress");
if (channel->openchannel_signed_cmd)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Already sent sigs, waiting for peer's");
/* Mark it as aborted so when we clean-up, we send the
* correct response */
channel->open_attempt->aborted = true;
channel->open_attempt->cmd = cmd;
/* Tell dualopend to fail this channel */
msg = towire_dualopend_fail(NULL, "Abort requested");
subd_send_msg(channel->owner, take(msg));
return command_still_pending(cmd);
}
static struct command_result *
json_openchannel_bump(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct channel_id *cid;
struct channel *channel;
struct amount_sat *amount, psbt_val;
struct wally_psbt *psbt;
u32 last_feerate_perkw, next_feerate_min, *feerate_per_kw_funding;
struct open_attempt *oa;
if (!param(cmd, buffer, params,
p_req("channel_id", param_channel_id, &cid),
p_req("amount", param_sat, &amount),
p_req("initialpsbt", param_psbt, &psbt),
p_opt("funding_feerate", param_feerate,
&feerate_per_kw_funding),
NULL))
return command_param_failed();
psbt_val = AMOUNT_SAT(0);
for (size_t i = 0; i < psbt->num_inputs; i++) {
struct amount_sat in_amt = psbt_input_get_amount(psbt, i);
if (!amount_sat_add(&psbt_val, psbt_val, in_amt))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Overflow in adding PSBT input"
" values. %s",
type_to_string(tmpctx,
struct wally_psbt,
psbt));
}
/* If they don't pass in at least enough in the PSBT to cover
* their amount, nope */
if (!amount_sat_greater(psbt_val, *amount))
return command_fail(cmd, FUND_CANNOT_AFFORD,
"Provided PSBT cannot afford funding of "
"amount %s. %s",
type_to_string(tmpctx,
struct amount_sat,
amount),
type_to_string(tmpctx,
struct wally_psbt,
psbt));
if (!topology_synced(cmd->ld->topology)) {
return command_fail(cmd, FUNDING_STILL_SYNCING_BITCOIN,
"Still syncing with bitcoin network");
}
/* Are we in a state where we can attempt an RBF? */
channel = channel_by_cid(cmd->ld, cid);
if (!channel)
return command_fail(cmd, FUNDING_UNKNOWN_CHANNEL,
"Unknown channel %s",
type_to_string(tmpctx, struct channel_id,
cid));
last_feerate_perkw = channel_last_funding_feerate(channel);
next_feerate_min = last_feerate_perkw * 65 / 64;
assert(next_feerate_min > last_feerate_perkw);
if (!feerate_per_kw_funding) {
feerate_per_kw_funding = tal(cmd, u32);
*feerate_per_kw_funding = next_feerate_min;
} else if (*feerate_per_kw_funding < next_feerate_min)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Next feerate must be at least 1/64th"
" greater than the last. Min req %u,"
" you proposed %u",
next_feerate_min,
*feerate_per_kw_funding);
/* BOLT #2:
* - if both nodes advertised `option_support_large_channel`:
* - MAY set `funding_satoshis` greater than or equal to 2^24 satoshi.
* - otherwise:
* - MUST set `funding_satoshis` to less than 2^24 satoshi.
*/
if (!feature_negotiated(cmd->ld->our_features,
channel->peer->their_features,
OPT_LARGE_CHANNELS)
&& amount_sat_greater(*amount, chainparams->max_funding))
return command_fail(cmd, FUND_MAX_EXCEEDED,
"Amount exceeded %s",
type_to_string(tmpctx, struct amount_sat,
&chainparams->max_funding));
if (!channel->owner)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected.");
if (channel->open_attempt)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Commitments for this channel not "
"secured, see `openchannel_update`");
if (channel->state != DUALOPEND_AWAITING_LOCKIN)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Channel not eligible to init RBF."
" Current state %s, expected state %s",
channel_state_name(channel),
channel_state_str(DUALOPEND_AWAITING_LOCKIN));
if (channel->opener != LOCAL)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Only the channel opener can initiate an"
" RBF attempt");
/* Ok, we're kosher to start */
channel->open_attempt = oa = new_channel_open_attempt(channel);
oa->funding = *amount;
oa->cmd = cmd;
oa->our_upfront_shutdown_script
= channel->shutdown_scriptpubkey[LOCAL];
/* Add serials to any input that's missing them */
psbt_add_serials(psbt, TX_INITIATOR);
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (!psbt_has_required_fields(psbt))
return command_fail(cmd, FUNDING_PSBT_INVALID,
"PSBT is missing required fields %s",
type_to_string(tmpctx, struct wally_psbt,
psbt));
subd_send_msg(channel->owner,
take(towire_dualopend_rbf_init(NULL, *amount,
*feerate_per_kw_funding,
psbt)));
return command_still_pending(cmd);
}
static struct command_result *
json_openchannel_signed(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct wally_psbt *psbt;
struct channel_id *cid;
struct channel *channel;
struct bitcoin_txid txid;
struct channel_inflight *inflight;
if (!param(cmd, buffer, params,
p_req("channel_id", param_channel_id, &cid),
p_req("signed_psbt", param_psbt, &psbt),
NULL))
return command_param_failed();
channel = channel_by_cid(cmd->ld, cid);
if (!channel)
return command_fail(cmd, FUNDING_UNKNOWN_CHANNEL,
"Unknown channel");
if (!channel->owner)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected");
if (channel->open_attempt)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Commitments for this channel not "
"yet secured, see `openchannel_update`");
if (list_empty(&channel->inflights))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Channel open not initialized yet.");
if (channel->openchannel_signed_cmd)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Already sent sigs, waiting for peer's");
/* Verify that the psbt's txid matches that of the
* funding txid for this channel */
psbt_txid(NULL, psbt, &txid, NULL);
if (!bitcoin_txid_eq(&txid, &channel->funding.txid))
return command_fail(cmd, FUNDING_PSBT_INVALID,
"Txid for passed in PSBT does not match"
" funding txid for channel. Expected %s, "
"received %s",
type_to_string(tmpctx, struct bitcoin_txid,
&channel->funding.txid),
type_to_string(tmpctx, struct bitcoin_txid,
&txid));
inflight = list_tail(&channel->inflights,
struct channel_inflight,
list);
if (!inflight)
return command_fail(cmd, LIGHTNINGD,
"Open attempt for channel not found");
if (!bitcoin_txid_eq(&txid, &inflight->funding->outpoint.txid))
return command_fail(cmd, LIGHTNINGD,
"Current inflight transaction is %s,"
" not %s",
type_to_string(tmpctx, struct bitcoin_txid,
&txid),
type_to_string(tmpctx, struct bitcoin_txid,
&inflight->funding
->outpoint.txid));
if (inflight->funding_psbt && psbt_is_finalized(inflight->funding_psbt))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Already have a finalized PSBT for "
"this channel");
/* Go ahead and try to finalize things, or what we can */
psbt_finalize(psbt);
/* Check that all of *our* outputs are finalized */
if (!psbt_side_finalized(psbt, channel->opener == LOCAL ?
TX_INITIATOR : TX_ACCEPTER))
return command_fail(cmd, FUNDING_PSBT_INVALID,
"Local PSBT input(s) not finalized");
/* Now that we've got the signed PSBT, save it */
tal_wally_start();
if (wally_psbt_combine(cast_const(struct wally_psbt *,
inflight->funding_psbt),
psbt) != WALLY_OK) {
tal_wally_end(tal_free(inflight->funding_psbt));
return command_fail(cmd, FUNDING_PSBT_INVALID,
"Failed adding sigs");
}
/* Make memleak happy, (otherwise cleaned up with `cmd`) */
tal_free(psbt);
tal_wally_end_onto(inflight, inflight->funding_psbt, struct wally_psbt);
/* Update the PSBT on disk */
wallet_inflight_save(cmd->ld->wallet, inflight);
/* Uses the channel->funding_txid, which we verified above */
channel_watch_funding(cmd->ld, channel);
/* Send our tx_sigs to the peer */
subd_send_msg(channel->owner,
take(towire_dualopend_send_tx_sigs(NULL,
inflight->funding_psbt)));
channel->openchannel_signed_cmd = tal_steal(channel, cmd);
return command_still_pending(cmd);
}
static struct command_result *json_openchannel_update(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct wally_psbt *psbt;
struct channel_id *cid;
struct channel *channel;
u8 *msg;
if (!param(cmd, buffer, params,
p_req("channel_id", param_channel_id, &cid),
p_req("psbt", param_psbt, &psbt),
NULL))
return command_param_failed();
channel = channel_by_cid(cmd->ld, cid);
if (!channel)
return command_fail(cmd, FUNDING_UNKNOWN_CHANNEL,
"Unknown channel %s",
type_to_string(tmpctx, struct channel_id,
cid));
if (!channel->owner)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected");
if (!channel->open_attempt)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Channel open not in progress");
if (channel->open_attempt->cmd)
return command_fail(cmd, FUNDING_STATE_INVALID,
"Another openchannel command"
" is in progress");
/* Add serials to PSBT */
psbt_add_serials(psbt, TX_INITIATOR);
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (!psbt_has_required_fields(psbt))
return command_fail(cmd, FUNDING_PSBT_INVALID,
"PSBT is missing required fields %s",
type_to_string(tmpctx, struct wally_psbt,
psbt));
channel->open_attempt->cmd = cmd;
msg = towire_dualopend_psbt_updated(NULL, psbt);
subd_send_msg(channel->owner, take(msg));
return command_still_pending(cmd);
}
static struct command_result *init_set_feerate(struct command *cmd,
u32 **feerate_per_kw,
u32 **feerate_per_kw_funding)
{
if (!*feerate_per_kw_funding) {
*feerate_per_kw_funding = tal(cmd, u32);
**feerate_per_kw_funding = opening_feerate(cmd->ld->topology);
if (!**feerate_per_kw_funding)
return command_fail(cmd, LIGHTNINGD,
"`funding_feerate` not specified and fee "
"estimation failed");
}
if (!*feerate_per_kw) {
*feerate_per_kw = tal(cmd, u32);
/* FIXME: Anchors are on by default, we should use the lowest
* possible feerate */
**feerate_per_kw = **feerate_per_kw_funding;
}
return NULL;
}
static struct command_result *json_openchannel_init(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct node_id *id;
struct peer *peer;
struct channel *channel;
bool *announce_channel;
u32 *feerate_per_kw_funding;
u32 *feerate_per_kw;
struct amount_sat *amount, psbt_val, *request_amt;
struct wally_psbt *psbt;
const u8 *our_upfront_shutdown_script;
u32 *our_upfront_shutdown_script_wallet_index;
struct open_attempt *oa;
struct lease_rates *rates;
struct command_result *res;
int fds[2];
if (!param(cmd, buffer, params,
p_req("id", param_node_id, &id),
p_req("amount", param_sat, &amount),
p_req("initialpsbt", param_psbt, &psbt),
p_opt("commitment_feerate", param_feerate, &feerate_per_kw),
p_opt("funding_feerate", param_feerate, &feerate_per_kw_funding),
p_opt_def("announce", param_bool, &announce_channel, true),
p_opt("close_to", param_bitcoin_address, &our_upfront_shutdown_script),
p_opt_def("request_amt", param_sat, &request_amt, AMOUNT_SAT(0)),
p_opt("compact_lease", param_lease_hex, &rates),
NULL))
return command_param_failed();
/* Gotta expect some rates ! */
if (!amount_sat_zero(*request_amt) && !rates)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Must pass in 'compact_lease' if requesting"
" funds from peer");
psbt_val = AMOUNT_SAT(0);
for (size_t i = 0; i < psbt->num_inputs; i++) {
struct amount_sat in_amt = psbt_input_get_amount(psbt, i);
if (!amount_sat_add(&psbt_val, psbt_val, in_amt))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Overflow in adding PSBT input"
" values. %s",
type_to_string(tmpctx,
struct wally_psbt,
psbt));
}
/* If they don't pass in at least enough in the PSBT to cover
* their amount, nope */
if (!amount_sat_greater(psbt_val, *amount))
return command_fail(cmd, FUND_CANNOT_AFFORD,
"Provided PSBT cannot afford funding of "
"amount %s. %s",
type_to_string(tmpctx,
struct amount_sat,
amount),
type_to_string(tmpctx,
struct wally_psbt,
psbt));
res = init_set_feerate(cmd, &feerate_per_kw, &feerate_per_kw_funding);
if (res)
return res;
if (!topology_synced(cmd->ld->topology)) {
return command_fail(cmd, FUNDING_STILL_SYNCING_BITCOIN,
"Still syncing with bitcoin network");
}
peer = peer_by_id(cmd->ld, id);
if (!peer) {
return command_fail(cmd, FUNDING_UNKNOWN_PEER, "Unknown peer");
}
channel = peer_any_unsaved_channel(peer, NULL);
if (!channel) {
channel = new_unsaved_channel(peer,
peer->ld->config.fee_base,
peer->ld->config.fee_per_satoshi);
/* We derive initial channel_id *now*, so we can tell it to
* connectd. */
derive_tmp_channel_id(&channel->cid,
&channel->local_basepoints.revocation);
}
if (channel->open_attempt
|| !list_empty(&channel->inflights))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Channel funding in-progress. %s",
channel_state_name(channel));
if (!feature_negotiated(cmd->ld->our_features,
peer->their_features,
OPT_DUAL_FUND)) {
return command_fail(cmd, FUNDING_V2_NOT_SUPPORTED,
"v2 openchannel not supported "
"by peer");
}
/* BOLT #2:
* - if both nodes advertised `option_support_large_channel`:
* - MAY set `funding_satoshis` greater than or equal to 2^24 satoshi.
* - otherwise:
* - MUST set `funding_satoshis` to less than 2^24 satoshi.
*/
if (!feature_negotiated(cmd->ld->our_features,
peer->their_features, OPT_LARGE_CHANNELS)
&& amount_sat_greater(*amount, chainparams->max_funding))
return command_fail(cmd, FUND_MAX_EXCEEDED,
"Amount exceeded %s",
type_to_string(tmpctx, struct amount_sat,
&chainparams->max_funding));
/* Add serials to any input that's missing them */
psbt_add_serials(psbt, TX_INITIATOR);
/* We require the PSBT to meet certain criteria such as
* extra, proprietary fields (`serial_id`s) or
* to have a `redeemscripts` iff the inputs are P2SH.
*
* Since this is externally provided, we confirm that
* they've done the right thing / haven't lost any required info.
*/
if (!psbt_has_required_fields(psbt))
return command_fail(cmd, FUNDING_PSBT_INVALID,
"PSBT is missing required fields %s",
type_to_string(tmpctx, struct wally_psbt,
psbt));
/* Get a new open_attempt going */
channel->opener = LOCAL;
channel->open_attempt = oa = new_channel_open_attempt(channel);
channel->channel_flags = OUR_CHANNEL_FLAGS;
oa->funding = *amount;
oa->cmd = cmd;
if (!*announce_channel) {
channel->channel_flags &= ~CHANNEL_FLAGS_ANNOUNCE_CHANNEL;
log_info(peer->ld->log,
"Will open private channel with node %s",
type_to_string(tmpctx, struct node_id, id));
}
/* Needs to be stolen away from cmd */
if (our_upfront_shutdown_script)
oa->our_upfront_shutdown_script
= tal_steal(oa, our_upfront_shutdown_script);
/* Determine the wallet index for our_upfront_shutdown_script,
* NULL if not found. */
u32 found_wallet_index;
bool is_p2sh;
if (wallet_can_spend(cmd->ld->wallet,
oa->our_upfront_shutdown_script,
&found_wallet_index,
&is_p2sh)) {
our_upfront_shutdown_script_wallet_index = tal(tmpctx, u32);
*our_upfront_shutdown_script_wallet_index = found_wallet_index;
} else
our_upfront_shutdown_script_wallet_index = NULL;
oa->open_msg = towire_dualopend_opener_init(oa,
psbt, *amount,
oa->our_upfront_shutdown_script,
our_upfront_shutdown_script_wallet_index,
*feerate_per_kw,
*feerate_per_kw_funding,
channel->channel_flags,
*request_amt,
get_block_height(cmd->ld->topology),
false,
rates);
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) != 0) {
return command_fail(cmd, FUND_MAX_EXCEEDED,
"Failed to create socketpair: %s",
strerror(errno));
}
/* Start dualopend! */
if (!peer_start_dualopend(peer, new_peer_fd(cmd, fds[0]), channel)) {
close(fds[1]);
/* FIXME: gets completed by failure path above! */
return command_its_complicated("completed by peer_start_dualopend");
}
/* Go! */
subd_send_msg(channel->owner, channel->open_attempt->open_msg);
/* Tell connectd connect this to this channel id. */
subd_send_msg(peer->ld->connectd,
take(towire_connectd_peer_connect_subd(NULL,
&peer->id,
peer->connectd_counter,
&channel->cid)));
subd_send_fd(peer->ld->connectd, fds[1]);
return command_still_pending(cmd);
}
static void
channel_fail_fallen_behind(struct subd* dualopend, const u8 *msg)
{
struct channel *channel = dualopend->channel;
if (!fromwire_dualopend_fail_fallen_behind(msg)) {
channel_internal_error(channel,
"Bad DUALOPEND_FAIL_FALLEN_BEHIND: %s",
tal_hex(tmpctx, msg));
return;
}
channel_fallen_behind(channel, msg);
}
static void handle_psbt_changed(struct subd *dualopend,
struct channel *channel,
const u8 *msg)
{
struct channel_id cid;
u64 funding_serial;
struct wally_psbt *psbt;
struct json_stream *response;
struct openchannel2_psbt_payload *payload;
struct open_attempt *oa;
struct command *cmd;
assert(channel->open_attempt);
oa = channel->open_attempt;
cmd = oa->cmd;
if (!fromwire_dualopend_psbt_changed(tmpctx, msg,
&cid,
&funding_serial,
&psbt)) {
channel_internal_error(channel,
"Bad DUALOPEND_PSBT_CHANGED: %s",
tal_hex(tmpctx, msg));
return;
}
switch (oa->role) {
case TX_INITIATOR:
if (!cmd) {
channel_err_broken(channel,
tal_fmt(tmpctx, "Unexpected"
" PSBT_CHANGED %s",
tal_hex(tmpctx, msg)));
return;
}
/* This might be the first time we learn the channel_id */
channel->cid = cid;
response = json_stream_success(cmd);
json_add_string(response, "channel_id",
type_to_string(tmpctx, struct channel_id,
&channel->cid));
json_add_psbt(response, "psbt", psbt);
json_add_bool(response, "commitments_secured", false);
json_add_u64(response, "funding_serial", funding_serial);
oa->cmd = NULL;
was_pending(command_success(cmd, response));
return;
case TX_ACCEPTER:
payload = tal(dualopend, struct openchannel2_psbt_payload);
payload->dualopend = dualopend;
tal_add_destructor2(dualopend,
openchannel2_psbt_remove_dualopend,
payload);
payload->psbt = tal_steal(payload, psbt);
payload->channel = channel;
plugin_hook_call_openchannel2_changed(dualopend->ld, payload);
return;
}
abort();
}
static void handle_commit_received(struct subd *dualopend,
struct channel *channel,
const u8 *msg)
{
struct lightningd *ld = dualopend->ld;
struct open_attempt *oa = channel->open_attempt;
struct channel_info channel_info;
struct bitcoin_tx *remote_commit;
struct bitcoin_signature remote_commit_sig;
struct bitcoin_outpoint funding;
u16 lease_chan_max_ppt;
u32 feerate_funding, feerate_commitment, lease_expiry,
lease_chan_max_msat, lease_blockheight_start;
struct amount_sat total_funding, funding_ours, lease_fee;
u8 *remote_upfront_shutdown_script,
*local_upfront_shutdown_script;
struct penalty_base *pbase;
struct wally_psbt *psbt;
struct json_stream *response;
struct openchannel2_psbt_payload *payload;
struct channel_inflight *inflight;
struct command *cmd = oa->cmd;
secp256k1_ecdsa_signature *lease_commit_sig;
if (!fromwire_dualopend_commit_rcvd(tmpctx, msg,
&channel_info.their_config,
&remote_commit,
&pbase,
&remote_commit_sig,
&psbt,
&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,
&total_funding,
&funding_ours,
&channel->channel_flags,
&feerate_funding,
&feerate_commitment,
&local_upfront_shutdown_script,
&remote_upfront_shutdown_script,
&lease_blockheight_start,
&lease_expiry,
&lease_fee,
&lease_commit_sig,
&lease_chan_max_msat,
&lease_chan_max_ppt)) {
channel_internal_error(channel,
"Bad WIRE_DUALOPEND_COMMIT_RCVD: %s",
tal_hex(msg, msg));
channel->open_attempt = tal_free(channel->open_attempt);
notify_channel_open_failed(channel->peer->ld, &channel->cid);
return;
}
/* We need to update the channel reserve on the config */
channel_update_reserve(channel,
&channel_info.their_config,
total_funding);
if (channel->state == DUALOPEND_OPEN_INIT) {
if (!(inflight = wallet_commit_channel(ld, channel,
remote_commit,
&remote_commit_sig,
&funding,
total_funding,
funding_ours,
&channel_info,
feerate_funding,
feerate_commitment,
oa->role == TX_INITIATOR ?
oa->our_upfront_shutdown_script :
local_upfront_shutdown_script,
remote_upfront_shutdown_script,
psbt,
lease_blockheight_start,
lease_expiry,
lease_fee,
lease_commit_sig,
lease_chan_max_msat,
lease_chan_max_ppt))) {
channel_internal_error(channel,
"wallet_commit_channel failed"
" (chan %s)",
type_to_string(tmpctx,
struct channel_id,
&channel->cid));
channel->open_attempt
= tal_free(channel->open_attempt);
return;
}
/* FIXME: handle RBF pbases */
if (pbase)
wallet_penalty_base_add(ld->wallet,
channel->dbid,
pbase);
} else {
assert(channel->state == DUALOPEND_AWAITING_LOCKIN);
if (!(inflight = wallet_update_channel(ld, channel,
remote_commit,
&remote_commit_sig,
&funding,
total_funding,
funding_ours,
feerate_funding,
psbt,
lease_expiry,
lease_fee,
lease_commit_sig,
lease_chan_max_msat,
lease_chan_max_ppt,
lease_blockheight_start))) {
channel_internal_error(channel,
"wallet_update_channel failed"
" (chan %s)",
type_to_string(tmpctx,
struct channel_id,
&channel->cid));
channel->open_attempt
= tal_free(channel->open_attempt);
return;
}
}
switch (oa->role) {
case TX_INITIATOR:
if (!oa->cmd) {
channel_err_broken(channel,
"Unexpected COMMIT_RCVD %s",
tal_hex(msg, msg));
channel->open_attempt
= tal_free(channel->open_attempt);
return;
}
response = json_stream_success(oa->cmd);
json_add_string(response, "channel_id",
type_to_string(tmpctx,
struct channel_id,
&channel->cid));
json_add_psbt(response, "psbt", psbt);
json_add_bool(response, "commitments_secured", true);
/* For convenience sake, we include the funding outnum */
json_add_num(response, "funding_outnum", funding.n);
if (oa->our_upfront_shutdown_script) {
json_add_hex_talarr(response, "close_to",
oa->our_upfront_shutdown_script);
/* FIXME: also include the output as address */
}
channel->open_attempt
= tal_free(channel->open_attempt);
was_pending(command_success(cmd, response));
return;
case TX_ACCEPTER:
payload = tal(dualopend, struct openchannel2_psbt_payload);
payload->ld = ld;
payload->dualopend = dualopend;
tal_add_destructor2(dualopend,
openchannel2_psbt_remove_dualopend,
payload);
payload->channel = channel;
payload->psbt = clone_psbt(payload, inflight->funding_psbt);
channel->open_attempt
= tal_free(channel->open_attempt);
/* We don't have a command, so set to NULL here */
payload->channel->openchannel_signed_cmd = NULL;
/* We call out to hook who will
* provide signatures for us! */
plugin_hook_call_openchannel2_sign(ld, payload);
return;
}
abort();
}
static unsigned int dual_opend_msg(struct subd *dualopend,
const u8 *msg, const int *fds)
{
enum dualopend_wire t = fromwire_peektype(msg);
struct channel *channel = dualopend->channel;
switch (t) {
case WIRE_DUALOPEND_GOT_OFFER:
accepter_got_offer(dualopend, dualopend->channel, msg);
return 0;
case WIRE_DUALOPEND_GOT_RBF_OFFER:
rbf_got_offer(dualopend, msg);
return 0;
case WIRE_DUALOPEND_PSBT_CHANGED:
handle_psbt_changed(dualopend, channel, msg);
return 0;
case WIRE_DUALOPEND_COMMIT_RCVD:
handle_commit_received(dualopend, channel, msg);
return 0;
case WIRE_DUALOPEND_RBF_VALIDATE:
handle_validate_rbf(dualopend, msg);
return 0;
case WIRE_DUALOPEND_VALIDATE_LEASE:
handle_validate_lease(dualopend, msg);
return 0;
case WIRE_DUALOPEND_FUNDING_SIGS:
handle_peer_tx_sigs_msg(dualopend, msg);
return 0;
case WIRE_DUALOPEND_TX_SIGS_SENT:
handle_peer_tx_sigs_sent(dualopend, fds, msg);
return 0;
case WIRE_DUALOPEND_PEER_LOCKED:
handle_peer_locked(dualopend, msg);
return 0;
case WIRE_DUALOPEND_DRY_RUN:
handle_dry_run_finished(dualopend, msg);
return 0;
case WIRE_DUALOPEND_CHANNEL_LOCKED:
if (tal_count(fds) != 1)
return 1;
handle_channel_locked(dualopend, fds, msg);
return 0;
case WIRE_DUALOPEND_GOT_SHUTDOWN:
handle_peer_wants_to_close(dualopend, msg);
return 0;
case WIRE_DUALOPEND_SHUTDOWN_COMPLETE:
if (tal_count(fds) != 1)
return 1;
handle_channel_closed(dualopend, fds, msg);
return 0;
case WIRE_DUALOPEND_FAIL_FALLEN_BEHIND:
channel_fail_fallen_behind(dualopend, msg);
return 0;
case WIRE_DUALOPEND_LOCAL_PRIVATE_CHANNEL:
handle_local_private_channel(dualopend, msg);
return 0;
/* Messages we send */
case WIRE_DUALOPEND_INIT:
case WIRE_DUALOPEND_REINIT:
case WIRE_DUALOPEND_OPENER_INIT:
case WIRE_DUALOPEND_RBF_INIT:
case WIRE_DUALOPEND_GOT_OFFER_REPLY:
case WIRE_DUALOPEND_GOT_RBF_OFFER_REPLY:
case WIRE_DUALOPEND_RBF_VALID:
case WIRE_DUALOPEND_VALIDATE_LEASE_REPLY:
case WIRE_DUALOPEND_FAIL:
case WIRE_DUALOPEND_PSBT_UPDATED:
case WIRE_DUALOPEND_SEND_TX_SIGS:
case WIRE_DUALOPEND_SEND_SHUTDOWN:
case WIRE_DUALOPEND_DEPTH_REACHED:
case WIRE_DUALOPEND_DEV_MEMLEAK:
case WIRE_DUALOPEND_DEV_MEMLEAK_REPLY:
break;
}
log_broken(dualopend->log, "Unexpected msg %s: %s",
dualopend_wire_name(t), tal_hex(tmpctx, msg));
tal_free(dualopend);
return 0;
}
#if DEVELOPER
static struct command_result *json_queryrates(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct node_id *id;
struct peer *peer;
struct channel *channel;
u32 *feerate_per_kw_funding;
u32 *feerate_per_kw;
struct amount_sat *amount, *request_amt;
struct wally_psbt *psbt;
struct open_attempt *oa;
u32 *our_upfront_shutdown_script_wallet_index;
struct command_result *res;
int fds[2];
if (!param(cmd, buffer, params,
p_req("id", param_node_id, &id),
p_req("amount", param_sat, &amount),
p_req("request_amt", param_sat, &request_amt),
p_opt("commitment_feerate", param_feerate, &feerate_per_kw),
p_opt("funding_feerate", param_feerate, &feerate_per_kw_funding),
NULL))
return command_param_failed();
res = init_set_feerate(cmd, &feerate_per_kw, &feerate_per_kw_funding);
if (res)
return res;
peer = peer_by_id(cmd->ld, id);
if (!peer) {
return command_fail(cmd, FUNDING_UNKNOWN_PEER, "Unknown peer");
}
if (peer->connected != PEER_CONNECTED)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer %s",
peer->connected == PEER_DISCONNECTED
? "not connected" : "still connecting");
/* FIXME: This is wrong: we should always create a new channel? */
channel = peer_any_unsaved_channel(peer, NULL);
if (!channel) {
channel = new_unsaved_channel(peer,
peer->ld->config.fee_base,
peer->ld->config.fee_per_satoshi);
/* We derive initial channel_id *now*, so we can tell it to
* connectd. */
derive_tmp_channel_id(&channel->cid,
&channel->local_basepoints.revocation);
}
if (channel->open_attempt
|| !list_empty(&channel->inflights))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Channel funding in-progress. %s",
channel_state_name(channel));
if (!feature_negotiated(cmd->ld->our_features,
peer->their_features,
OPT_DUAL_FUND)) {
return command_fail(cmd, FUNDING_V2_NOT_SUPPORTED,
"v2 openchannel not supported "
"by peer, can't query rates");
}
/* BOLT #2:
* - if both nodes advertised `option_support_large_channel`:
* - MAY set `funding_satoshis` greater than or equal to 2^24 satoshi.
* - otherwise:
* - MUST set `funding_satoshis` to less than 2^24 satoshi.
*/
if (!feature_negotiated(cmd->ld->our_features,
peer->their_features, OPT_LARGE_CHANNELS)
&& amount_sat_greater(*amount, chainparams->max_funding))
return command_fail(cmd, FUND_MAX_EXCEEDED,
"Amount exceeded %s",
type_to_string(tmpctx, struct amount_sat,
&chainparams->max_funding));
/* Get a new open_attempt going, keeps us from re-initing
* while looking */
channel->opener = LOCAL;
channel->open_attempt = oa = new_channel_open_attempt(channel);
channel->channel_flags = OUR_CHANNEL_FLAGS;
oa->funding = *amount;
oa->cmd = cmd;
/* empty psbt to start */
psbt = create_psbt(tmpctx, 0, 0, 0);
/* Determine the wallet index for our_upfront_shutdown_script,
* NULL if not found. */
u32 found_wallet_index;
bool is_p2sh;
if (wallet_can_spend(cmd->ld->wallet,
oa->our_upfront_shutdown_script,
&found_wallet_index,
&is_p2sh)) {
our_upfront_shutdown_script_wallet_index = tal(tmpctx, u32);
*our_upfront_shutdown_script_wallet_index = found_wallet_index;
} else
our_upfront_shutdown_script_wallet_index = NULL;
oa->open_msg = towire_dualopend_opener_init(oa,
psbt, *amount,
oa->our_upfront_shutdown_script,
our_upfront_shutdown_script_wallet_index,
*feerate_per_kw,
*feerate_per_kw_funding,
channel->channel_flags,
*request_amt,
get_block_height(cmd->ld->topology),
true,
NULL);
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) != 0) {
return command_fail(cmd, FUND_MAX_EXCEEDED,
"Failed to create socketpair: %s",
strerror(errno));
}
/* Start dualopend! */
if (!peer_start_dualopend(peer, new_peer_fd(cmd, fds[0]), channel)) {
close(fds[1]);
/* FIXME: gets completed by failure path above! */
return command_its_complicated("completed by peer_start_dualopend");
}
/* Go! */
subd_send_msg(channel->owner, channel->open_attempt->open_msg);
/* Tell connectd connect this to this channel id. */
subd_send_msg(peer->ld->connectd,
take(towire_connectd_peer_connect_subd(NULL,
&peer->id,
peer->connectd_counter,
&channel->cid)));
subd_send_fd(peer->ld->connectd, fds[1]);
return command_still_pending(cmd);
}
static const struct json_command queryrates_command = {
"dev-queryrates",
"channels",
json_queryrates,
"Ask a peer what their contribution and liquidity rates are"
" for the given {amount} and {requested_amt}"
};
AUTODATA(json_command, &queryrates_command);
#endif /* DEVELOPER */
static const struct json_command openchannel_init_command = {
"openchannel_init",
"channels",
json_openchannel_init,
"Init an open channel to {id} with {initialpsbt} for {amount} satoshis. "
"Returns updated {psbt} with (partial) contributions from peer"
};
static const struct json_command openchannel_update_command = {
"openchannel_update",
"channels",
json_openchannel_update,
"Update {channel_id} with {psbt}. "
"Returns updated {psbt} with (partial) contributions from peer. "
"If {commitments_secured} is true, next call should be to openchannel_signed"
};
static const struct json_command openchannel_signed_command = {
"openchannel_signed",
"channels",
json_openchannel_signed,
"Send our {signed_psbt}'s tx sigs for {channel_id}."
};
static const struct json_command openchannel_bump_command = {
"openchannel_bump",
"channels",
json_openchannel_bump,
"Attempt to bump the fee on {channel_id}'s funding transaction."
};
static const struct json_command openchannel_abort_command = {
"openchannel_abort",
"channels",
json_openchannel_abort,
"Abort {channel_id}'s open. Usable while `commitment_signed=false`."
};
AUTODATA(json_command, &openchannel_init_command);
AUTODATA(json_command, &openchannel_update_command);
AUTODATA(json_command, &openchannel_signed_command);
AUTODATA(json_command, &openchannel_bump_command);
AUTODATA(json_command, &openchannel_abort_command);
bool peer_start_dualopend(struct peer *peer,
struct peer_fd *peer_fd,
struct channel *channel)
{
int hsmfd;
u32 max_to_self_delay;
struct amount_msat min_effective_htlc_capacity;
const u8 *msg;
hsmfd = hsm_get_client_fd(peer->ld, &peer->id, channel->unsaved_dbid,
HSM_CAP_COMMITMENT_POINT
| HSM_CAP_SIGN_REMOTE_TX
| HSM_CAP_SIGN_WILL_FUND_OFFER);
channel->owner = new_channel_subd(channel,
peer->ld,
"lightning_dualopend",
channel,
&peer->id,
channel->log, true,
dualopend_wire_name,
dual_opend_msg,
channel_errmsg,
channel_set_billboard,
take(&peer_fd->fd),
take(&hsmfd), NULL);
if (!channel->owner) {
channel_internal_error(channel,
"Running lightningd_dualopend: %s",
strerror(errno));
return false;
}
channel_config(peer->ld, &channel->our_config,
&max_to_self_delay,
&min_effective_htlc_capacity);
/* BOLT #2:
*
* The sender:
* - SHOULD set `minimum_depth` to a number of blocks it
* considers reasonable to avoid double-spending of the
* funding transaction.
*/
channel->minimum_depth = peer->ld->config.anchor_confirms;
msg = towire_dualopend_init(NULL, chainparams,
peer->ld->our_features,
peer->their_features,
&channel->our_config,
max_to_self_delay,
min_effective_htlc_capacity,
&channel->local_basepoints,
&channel->local_funding_pubkey,
channel->minimum_depth);
subd_send_msg(channel->owner, take(msg));
return true;
}
bool peer_restart_dualopend(struct peer *peer,
struct peer_fd *peer_fd,
struct channel *channel)
{
u32 max_to_self_delay, blockheight;
struct amount_msat min_effective_htlc_capacity;
struct channel_config unused_config;
struct channel_inflight *inflight;
int hsmfd;
u32 *local_shutdown_script_wallet_index;
u8 *msg;
if (channel_unsaved(channel))
return peer_start_dualopend(peer, peer_fd, channel);
hsmfd = hsm_get_client_fd(peer->ld, &peer->id, channel->dbid,
HSM_CAP_COMMITMENT_POINT
| HSM_CAP_SIGN_REMOTE_TX
| HSM_CAP_SIGN_WILL_FUND_OFFER);
channel_set_owner(channel,
new_channel_subd(channel, peer->ld,
"lightning_dualopend",
channel,
&peer->id,
channel->log, true,
dualopend_wire_name,
dual_opend_msg,
channel_errmsg,
channel_set_billboard,
take(&peer_fd->fd),
take(&hsmfd), NULL));
if (!channel->owner) {
log_broken(channel->log, "Could not subdaemon channel: %s",
strerror(errno));
/* Disconnect it. */
subd_send_msg(peer->ld->connectd,
take(towire_connectd_discard_peer(NULL, &channel->peer->id,
channel->peer->connectd_counter)));
return false;
}
/* Find the max self delay and min htlc capacity */
channel_config(peer->ld, &unused_config,
&max_to_self_delay,
&min_effective_htlc_capacity);
inflight = channel_current_inflight(channel);
assert(inflight);
blockheight = get_blockheight(channel->blockheight_states,
channel->opener, LOCAL);
/* Determine the wallet index for the LOCAL shutdown_scriptpubkey,
* NULL if not found. */
u32 found_wallet_index;
bool is_p2sh;
if (wallet_can_spend(peer->ld->wallet,
channel->shutdown_scriptpubkey[LOCAL],
&found_wallet_index,
&is_p2sh)) {
local_shutdown_script_wallet_index = tal(tmpctx, u32);
*local_shutdown_script_wallet_index = found_wallet_index;
} else
local_shutdown_script_wallet_index = NULL;
msg = towire_dualopend_reinit(NULL,
chainparams,
peer->ld->our_features,
peer->their_features,
&channel->our_config,
&channel->channel_info.their_config,
&channel->cid,
max_to_self_delay,
min_effective_htlc_capacity,
&channel->local_basepoints,
&channel->local_funding_pubkey,
&channel->channel_info.remote_fundingkey,
channel->minimum_depth,
&inflight->funding->outpoint,
inflight->funding->feerate,
channel->funding_sats,
channel->our_msat,
&channel->channel_info.theirbase,
&channel->channel_info.remote_per_commit,
inflight->funding_psbt,
channel->opener,
channel->scid != NULL,
channel->remote_funding_locked,
channel->state == CHANNELD_SHUTTING_DOWN,
channel->shutdown_scriptpubkey[REMOTE] != NULL,
channel->shutdown_scriptpubkey[LOCAL],
channel->remote_upfront_shutdown_script,
local_shutdown_script_wallet_index,
inflight->remote_tx_sigs,
channel->fee_states,
channel->channel_flags,
blockheight,
inflight->lease_expiry,
inflight->lease_commit_sig,
inflight->lease_chan_max_msat,
inflight->lease_chan_max_ppt);
subd_send_msg(channel->owner, take(msg));
return true;
}
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