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

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

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

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

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#include "config.h"
#include <bitcoin/feerate.h>
#include <bitcoin/psbt.h>
#include <ccan/cast/cast.h>
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <common/addr.h>
#include <common/blockheight_states.h>
#include <common/configdir.h>
#include <common/fee_states.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/memleak.h>
#include <common/scb_wiregen.h>
#include <common/type_to_string.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/connect_control.h>
#include <lightningd/hsm_control.h>
#include <lightningd/notification.h>
#include <lightningd/opening_common.h>
#include <lightningd/opening_control.h>
#include <lightningd/peer_fd.h>
#include <lightningd/plugin_hook.h>
#include <lightningd/subd.h>
#include <openingd/openingd_wiregen.h>
#include <sodium/randombytes.h>
#include <wally_psbt.h>
void json_add_uncommitted_channel(struct json_stream *response,
const struct uncommitted_channel *uc)
{
struct amount_msat total, ours;
if (!uc)
return;
/* If we're chatting but no channel, that's shown by connected: True */
if (!uc->fc)
return;
json_object_start(response, NULL);
json_add_string(response, "state", "OPENINGD");
json_add_string(response, "owner", "lightning_openingd");
json_add_string(response, "opener", "local");
if (uc->transient_billboard) {
json_array_start(response, "status");
json_add_string(response, NULL, uc->transient_billboard);
json_array_end(response);
}
/* These should never fail. */
if (amount_sat_to_msat(&total, uc->fc->funding_sats)
&& amount_msat_sub(&ours, total, uc->fc->push)) {
json_add_amount_msat_compat(response, ours,
"msatoshi_to_us", "to_us_msat");
json_add_amount_msat_compat(response, total,
"msatoshi_total", "total_msat");
}
json_array_start(response, "features");
if (feature_negotiated(uc->peer->ld->our_features,
uc->peer->their_features,
OPT_STATIC_REMOTEKEY))
json_add_string(response, NULL, "option_static_remotekey");
if (feature_negotiated(uc->peer->ld->our_features,
uc->peer->their_features,
OPT_ANCHOR_OUTPUTS))
json_add_string(response, NULL, "option_anchor_outputs");
json_array_end(response);
json_object_end(response);
}
/* Steals fields from uncommitted_channel: returns NULL if can't generate a
* key for this channel (shouldn't happen!). */
static struct channel *
wallet_commit_channel(struct lightningd *ld,
struct uncommitted_channel *uc,
struct channel_id *cid,
struct bitcoin_tx *remote_commit,
struct bitcoin_signature *remote_commit_sig,
const struct bitcoin_outpoint *funding,
struct amount_sat funding_sats,
struct amount_msat push,
u8 channel_flags,
struct channel_info *channel_info,
u32 feerate,
const u8 *our_upfront_shutdown_script,
const u8 *remote_upfront_shutdown_script,
const struct channel_type *type)
{
struct channel *channel;
struct amount_msat our_msat;
struct amount_sat local_funding;
s64 final_key_idx;
u64 static_remotekey_start;
u32 lease_start_blockheight = 0; /* No leases on v1 */
struct short_channel_id *alias_local;
struct timeabs timestamp;
bool any_active = peer_any_active_channel(uc->peer, NULL);
/* We cannot both be the fundee *and* have a `fundchannel_start`
* command running!
*/
assert(!(uc->got_offer && uc->fc));
/* Get a key to use for closing outputs from this tx */
final_key_idx = wallet_get_newindex(ld);
if (final_key_idx == -1) {
log_broken(uc->log, "Can't get final key index");
return NULL;
}
if (uc->fc) {
if (!amount_sat_sub_msat(&our_msat, funding_sats, push)) {
log_broken(uc->log, "push %s exceeds funding %s",
type_to_string(tmpctx, struct amount_msat,
&push),
type_to_string(tmpctx, struct amount_sat,
&funding_sats));
return NULL;
}
local_funding = funding_sats;
} else {
our_msat = push;
local_funding = AMOUNT_SAT(0);
}
/* old_remote_per_commit not valid yet, copy valid one. */
channel_info->old_remote_per_commit = channel_info->remote_per_commit;
/* BOLT #2:
* 1. type: 35 (`funding_signed`)
* 2. data:
* * [`channel_id`:`channel_id`]
* * [`signature`:`signature`]
*
* #### Requirements
*
* Both peers:
* ...
* - if `option_anchors_zero_fee_htlc_tx` was negotiated:
* - the `channel_type` is `option_anchors_zero_fee_htlc_tx` and
* `option_static_remotekey` (bits 22 and 12)
* - otherwise, if `option_anchor_outputs` was negotiated:
* - the `channel_type` is `option_anchor_outputs` and
* `option_static_remotekey` (bits 20 and 12)
* - otherwise, if `option_static_remotekey` was negotiated:
* - the `channel_type` is `option_static_remotekey` (bit 12)
* - otherwise:
* - the `channel_type` is empty
* - MUST use that `channel_type` for all commitment transactions.
*/
/* i.e. We set it now for the channel permanently. */
if (channel_type_has(type, OPT_STATIC_REMOTEKEY))
static_remotekey_start = 0;
else
static_remotekey_start = 0x7FFFFFFFFFFFFFFF;
alias_local = tal(NULL, struct short_channel_id);
randombytes_buf(alias_local, sizeof(struct short_channel_id));
channel = new_channel(uc->peer, uc->dbid,
NULL, /* No shachain yet */
CHANNELD_AWAITING_LOCKIN,
uc->fc ? LOCAL : REMOTE,
uc->log,
take(uc->transient_billboard),
channel_flags,
&uc->our_config,
uc->minimum_depth,
1, 1, 0,
funding,
funding_sats,
push,
local_funding,
false, /* !remote_funding_locked */
NULL, /* no scid yet */
alias_local, /* But maybe we have an alias we want to use? */
NULL, /* They haven't told us an alias yet */
cid,
/* The three arguments below are msatoshi_to_us,
* msatoshi_to_us_min, and msatoshi_to_us_max.
* Because, this is a newly-funded channel,
* all three are same value. */
our_msat,
our_msat, /* msat_to_us_min */
our_msat, /* msat_to_us_max */
remote_commit,
remote_commit_sig,
NULL, /* No HTLC sigs yet */
channel_info,
take(new_fee_states(NULL, uc->fc ? LOCAL : REMOTE,
&feerate)),
NULL, /* No shutdown_scriptpubkey[REMOTE] yet */
our_upfront_shutdown_script,
final_key_idx, false,
NULL, /* No commit sent yet */
/* If we're fundee, could be a little before this
* in theory, but it's only used for timing out. */
get_network_blockheight(ld->topology),
feerate, feerate,
&uc->local_basepoints,
&uc->local_funding_pubkey,
NULL,
ld->config.fee_base,
ld->config.fee_per_satoshi,
remote_upfront_shutdown_script,
static_remotekey_start, static_remotekey_start,
type,
NUM_SIDES, /* closer not yet known */
uc->fc ? REASON_USER : REASON_REMOTE,
NULL,
take(new_height_states(NULL, uc->fc ? LOCAL : REMOTE,
&lease_start_blockheight)),
0, NULL, 0, 0, /* No leases on v1s */
ld->config.htlc_minimum_msat,
ld->config.htlc_maximum_msat);
/* Now we finally put it in the database. */
wallet_channel_insert(ld->wallet, channel);
/* Notify that channel state changed (from non existant to existant) */
timestamp = time_now();
notify_channel_state_changed(ld, &channel->peer->id,
&channel->cid,
channel->scid, /* NULL */
&timestamp,
0, /* No prior state */
channel->state,
channel->state_change_cause,
"new channel opened");
/* 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 channel;
}
/** cancel_after_fundchannel_complete_success
*
* @brief Called to cancel a `fundchannel` after
* a `fundchannel_complete` succeeds.
*
* @desc Specifically, this is called when a
* `fundchannel_cancel` is blocked due to a
* parallel `fundchannel_complete` still running.
* After the `fundchannel_complete` succeeds, we
* invoke this function to cancel the funding
* after all.
*
* In effect, this forces the `fundchannel_cancel`
* to be invoked after the `fundchannel_complete`
* succeeds, leading to a reasonable serial
* execution.
*
* @param cmd - The `fundchannel_cancel` command
* that wants to cancel this.
* @param channel - The channel being cancelled.
*/
static void
cancel_after_fundchannel_complete_success(struct command *cmd,
struct channel *channel)
{
was_pending(cancel_channel_before_broadcast(cmd, channel->peer));
}
static void funding_success(struct channel *channel)
{
struct json_stream *response;
struct funding_channel *fc =
channel->peer->uncommitted_channel->fc;
struct command *cmd = fc->cmd;
/* Well, those cancels now need to trigger! */
for (size_t i = 0; i < tal_count(fc->cancels); i++)
cancel_after_fundchannel_complete_success(fc->cancels[i],
channel);
response = json_stream_success(cmd);
json_add_string(response, "channel_id",
type_to_string(tmpctx, struct channel_id,
&channel->cid));
json_add_bool(response, "commitments_secured", true);
was_pending(command_success(cmd, response));
}
static void funding_started_success(struct funding_channel *fc)
{
struct json_stream *response;
struct command *cmd = fc->cmd;
char *out;
response = json_stream_success(cmd);
out = encode_scriptpubkey_to_addr(cmd,
chainparams,
fc->funding_scriptpubkey);
if (out) {
json_add_string(response, "funding_address", out);
json_add_hex_talarr(response, "scriptpubkey",
fc->funding_scriptpubkey);
if (fc->our_upfront_shutdown_script)
json_add_hex_talarr(response, "close_to", fc->our_upfront_shutdown_script);
json_add_string(response, "warning_usage",
"The funding transaction MUST NOT be broadcast until after channel establishment has been successfully completed by running `fundchannel_complete`");
}
/* Clear this so cancel doesn't think it's still in progress */
fc->cmd = NULL;
was_pending(command_success(cmd, response));
}
static void opening_funder_start_replied(struct subd *openingd, const u8 *resp,
const int *fds,
struct funding_channel *fc)
{
bool supports_shutdown_script;
if (!fromwire_openingd_funder_start_reply(fc, resp,
&fc->funding_scriptpubkey,
&supports_shutdown_script,
&fc->channel_type)) {
log_broken(fc->uc->log,
"bad OPENING_FUNDER_REPLY %s",
tal_hex(resp, resp));
was_pending(command_fail(fc->cmd, LIGHTNINGD,
"bad OPENING_FUNDER_REPLY %s",
tal_hex(fc->cmd, resp)));
goto failed;
}
/* If we're not using the upfront shutdown script, forget it */
if (!supports_shutdown_script)
fc->our_upfront_shutdown_script =
tal_free(fc->our_upfront_shutdown_script);
funding_started_success(fc);
/* Mark that we're in-flight */
fc->inflight = true;
return;
failed:
/* Frees fc too */
tal_free(fc->uc);
}
static void opening_funder_finished(struct subd *openingd, const u8 *resp,
const int *fds,
struct funding_channel *fc)
{
struct channel_info channel_info;
struct channel_id cid;
struct bitcoin_outpoint funding;
struct bitcoin_signature remote_commit_sig;
struct bitcoin_tx *remote_commit;
u32 feerate;
struct channel *channel;
struct lightningd *ld = openingd->ld;
u8 *remote_upfront_shutdown_script;
struct peer_fd *peer_fd;
struct penalty_base *pbase;
struct channel_type *type;
/* This is a new channel_info.their_config so set its ID to 0 */
channel_info.their_config.id = 0;
if (!fromwire_openingd_funder_reply(resp, resp,
&channel_info.their_config,
&remote_commit,
&pbase,
&remote_commit_sig,
&channel_info.theirbase.revocation,
&channel_info.theirbase.payment,
&channel_info.theirbase.htlc,
&channel_info.theirbase.delayed_payment,
&channel_info.remote_per_commit,
&fc->uc->minimum_depth,
&channel_info.remote_fundingkey,
&funding,
&feerate,
&fc->uc->our_config.channel_reserve,
&remote_upfront_shutdown_script,
&type)) {
log_broken(fc->uc->log,
"bad OPENING_FUNDER_REPLY %s",
tal_hex(resp, resp));
was_pending(command_fail(fc->cmd, LIGHTNINGD,
"bad OPENING_FUNDER_REPLY %s",
tal_hex(fc->cmd, resp)));
goto cleanup;
}
remote_commit->chainparams = chainparams;
peer_fd = new_peer_fd_arr(resp, fds);
log_debug(ld->log,
"%s", type_to_string(tmpctx, struct pubkey,
&channel_info.remote_per_commit));
/* Saved with channel to disk */
derive_channel_id(&cid, &funding);
/* old_remote_per_commit not valid yet, copy valid one. */
channel_info.old_remote_per_commit = channel_info.remote_per_commit;
/* Steals fields from uc */
channel = wallet_commit_channel(ld, fc->uc,
&cid,
remote_commit,
&remote_commit_sig,
&funding,
fc->funding_sats,
fc->push,
fc->channel_flags,
&channel_info,
feerate,
fc->our_upfront_shutdown_script,
remote_upfront_shutdown_script,
type);
if (!channel) {
was_pending(command_fail(fc->cmd, LIGHTNINGD,
"Key generation failure"));
goto cleanup;
}
/* Watch for funding confirms */
channel_watch_funding(ld, channel);
if (pbase)
wallet_penalty_base_add(ld->wallet, channel->dbid, pbase);
funding_success(channel);
peer_start_channeld(channel, peer_fd, NULL, false, NULL);
cleanup:
/* Frees fc too */
tal_free(fc->uc);
}
static void opening_fundee_finished(struct subd *openingd,
const u8 *reply,
const int *fds,
struct uncommitted_channel *uc)
{
const u8 *fwd_msg;
struct channel_info channel_info;
struct bitcoin_signature remote_commit_sig;
struct bitcoin_tx *remote_commit;
struct channel_id cid;
struct lightningd *ld = openingd->ld;
struct bitcoin_outpoint funding;
struct amount_sat funding_sats;
struct amount_msat push;
u32 feerate;
u8 channel_flags;
struct channel *channel;
u8 *remote_upfront_shutdown_script, *local_upfront_shutdown_script;
struct peer_fd *peer_fd;
struct penalty_base *pbase;
struct channel_type *type;
log_debug(uc->log, "Got opening_fundee_finish_response");
/* This is a new channel_info.their_config, set its ID to 0 */
channel_info.their_config.id = 0;
peer_fd = new_peer_fd_arr(tmpctx, fds);
if (!fromwire_openingd_fundee(tmpctx, reply,
&channel_info.their_config,
&remote_commit,
&pbase,
&remote_commit_sig,
&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,
&funding_sats,
&push,
&channel_flags,
&feerate,
cast_const2(u8 **, &fwd_msg),
&uc->our_config.channel_reserve,
&local_upfront_shutdown_script,
&remote_upfront_shutdown_script,
&type)) {
log_broken(uc->log, "bad OPENING_FUNDEE_REPLY %s",
tal_hex(reply, reply));
uncommitted_channel_disconnect(uc, LOG_BROKEN,
"bad OPENING_FUNDEE_REPLY");
goto failed;
}
remote_commit->chainparams = chainparams;
derive_channel_id(&cid, &funding);
/* old_remote_per_commit not valid yet, copy valid one. */
channel_info.old_remote_per_commit = channel_info.remote_per_commit;
/* Consumes uc */
channel = wallet_commit_channel(ld, uc,
&cid,
remote_commit,
&remote_commit_sig,
&funding,
funding_sats,
push,
channel_flags,
&channel_info,
feerate,
local_upfront_shutdown_script,
remote_upfront_shutdown_script,
type);
if (!channel) {
uncommitted_channel_disconnect(uc, LOG_BROKEN,
"Commit channel failed");
goto failed;
}
log_debug(channel->log, "Watching funding tx %s",
type_to_string(reply, struct bitcoin_txid,
&channel->funding.txid));
channel_watch_funding(ld, channel);
/* Tell plugins about the success */
notify_channel_opened(ld, &channel->peer->id, &channel->funding_sats,
&channel->funding.txid, &channel->remote_funding_locked);
if (pbase)
wallet_penalty_base_add(ld->wallet, channel->dbid, pbase);
/* On to normal operation! */
peer_start_channeld(channel, peer_fd, fwd_msg, false, NULL);
tal_free(uc);
return;
failed:
tal_free(uc);
}
static void
opening_funder_failed_cancel_commands(struct uncommitted_channel *uc,
const char *desc)
{
/* If no funding command(s) pending, do nothing. */
if (!uc->fc)
return;
/* Tell anyone who was trying to cancel */
for (size_t i = 0; i < tal_count(uc->fc->cancels); i++) {
struct json_stream *response;
response = json_stream_success(uc->fc->cancels[i]);
json_add_string(response, "cancelled", desc);
was_pending(command_success(uc->fc->cancels[i], response));
}
/* Tell any fundchannel_complete or fundchannel command */
if (uc->fc->cmd)
was_pending(command_fail(uc->fc->cmd, LIGHTNINGD, "%s", desc));
/* Clear uc->fc, so we can try again, and so we don't fail twice
* if they close.
* This code is also used in the case where we turn out to already
* be the fundee, in which case we should not have any `fc` at all,
* so we definitely should clear this.
*/
uc->fc = tal_free(uc->fc);
}
static void openingd_failed(struct subd *openingd, const u8 *msg,
struct uncommitted_channel *uc)
{
char *desc;
/* Since we're detaching from uc, we'll be unreferenced until
* our imminent exit (as will our parent, openingd->conn). */
notleak(openingd);
/* openingd->conn is set to NULL temporarily for this call, so: */
notleak(tal_parent(openingd));
if (!fromwire_openingd_failed(msg, msg, &desc)) {
log_broken(uc->log,
"bad OPENINGD_FAILED %s",
tal_hex(tmpctx, msg));
if (uc->fc)
was_pending(command_fail(uc->fc->cmd, LIGHTNINGD,
"bad OPENINGD_FAILED %s",
tal_hex(uc->fc->cmd, msg)));
tal_free(uc);
return;
}
/* Noop if we're not funder. */
opening_funder_failed_cancel_commands(uc, desc);
/* Detaches from ->peer */
tal_free(uc);
}
struct openchannel_hook_payload {
struct subd *openingd;
struct uncommitted_channel* uc;
struct amount_sat funding_satoshis;
struct amount_msat push_msat;
struct amount_sat dust_limit_satoshis;
struct amount_msat max_htlc_value_in_flight_msat;
struct amount_sat channel_reserve_satoshis;
struct amount_msat htlc_minimum_msat;
u32 feerate_per_kw;
u16 to_self_delay;
u16 max_accepted_htlcs;
u8 channel_flags;
u8 *shutdown_scriptpubkey;
const u8 *our_upfront_shutdown_script;
char *errmsg;
};
static void openchannel_hook_serialize(struct openchannel_hook_payload *payload,
struct json_stream *stream,
struct plugin *plugin)
{
struct uncommitted_channel *uc = payload->openingd->channel;
json_object_start(stream, "openchannel");
json_add_node_id(stream, "id", &uc->peer->id);
json_add_amount_sats_deprecated(stream, "funding_satoshis", "funding_msat",
payload->funding_satoshis);
json_add_amount_msat_only(stream, "push_msat", payload->push_msat);
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_sats_deprecated(stream, "channel_reserve_satoshis", "channel_reserve_msat",
payload->channel_reserve_satoshis);
json_add_amount_msat_only(stream, "htlc_minimum_msat",
payload->htlc_minimum_msat);
json_add_num(stream, "feerate_per_kw", payload->feerate_per_kw);
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);
if (tal_count(payload->shutdown_scriptpubkey) != 0)
json_add_hex_talarr(stream, "shutdown_scriptpubkey",
payload->shutdown_scriptpubkey);
json_object_end(stream); /* .openchannel */
}
/* openingd dies? Remove openingd ptr from payload */
static void openchannel_payload_remove_openingd(struct subd *openingd,
struct openchannel_hook_payload *payload)
{
assert(payload->openingd == openingd);
payload->openingd = NULL;
}
static void
openchannel_hook_final(struct openchannel_hook_payload *payload STEALS)
{
struct subd *openingd = payload->openingd;
const u8 *our_upfront_shutdown_script = payload->our_upfront_shutdown_script;
const char *errmsg = payload->errmsg;
struct uncommitted_channel* uc = payload->uc;
u32 *upfront_shutdown_script_wallet_index;
/* We want to free this, whatever happens. */
tal_steal(tmpctx, payload);
/* If openingd went away, don't send it anything! */
if (!openingd)
return;
tal_del_destructor2(openingd, openchannel_payload_remove_openingd, payload);
if (!errmsg) {
/* Plugins accepted the offer, cancel any of our
* funder-side commands. */
opening_funder_failed_cancel_commands(uc,
"Have in-progress "
"`open_channel` from "
"peer");
uc->got_offer = true;
}
/* Determine the wallet index for our_upfront_shutdown_script,
* NULL if not found. */
u32 found_wallet_index;
bool is_p2sh;
if (wallet_can_spend(payload->openingd->ld->wallet,
our_upfront_shutdown_script,
&found_wallet_index,
&is_p2sh)) {
upfront_shutdown_script_wallet_index = tal(tmpctx, u32);
*upfront_shutdown_script_wallet_index = found_wallet_index;
} else
upfront_shutdown_script_wallet_index = NULL;
subd_send_msg(openingd,
take(towire_openingd_got_offer_reply(NULL, errmsg,
our_upfront_shutdown_script,
upfront_shutdown_script_wallet_index)));
}
static bool
openchannel_hook_deserialize(struct openchannel_hook_payload *payload,
const char *buffer,
const jsmntok_t *toks)
{
struct subd *openingd = payload->openingd;
/* already rejected by prior plugin hook in the chain */
if (payload->errmsg != NULL)
return true;
if (!toks || !buffer)
return true;
const jsmntok_t *t_result = json_get_member(buffer, toks, "result");
const jsmntok_t *t_errmsg = json_get_member(buffer, toks, "error_message");
const jsmntok_t *t_closeto = json_get_member(buffer, toks, "close_to");
const jsmntok_t *t_mindepth = json_get_member(buffer, toks, "mindepth");
if (!t_result)
fatal("Plugin returned an invalid response to the"
" openchannel hook: %.*s",
toks[0].end - toks[0].start, buffer + toks[0].start);
/* reject */
if (json_tok_streq(buffer, t_result, "reject")) {
payload->errmsg = "";
if (t_errmsg)
payload->errmsg = json_strdup(payload, buffer, t_errmsg);
log_debug(openingd->ld->log,
"openchannel hook rejects and says '%s'",
payload->errmsg);
if (t_closeto)
fatal("Plugin rejected openchannel but also set close_to");
openchannel_hook_final(payload);
return false;
} else if (!json_tok_streq(buffer, t_result, "continue")) {
fatal("Plugin returned an invalid result for the "
"openchannel hook: %.*s",
t_result->end - t_result->start, buffer + t_result->start);
}
/* Check for a valid 'close_to' address passed back */
if (t_closeto) {
/* First plugin can set close_to. Log others. */
if (payload->our_upfront_shutdown_script != NULL) {
log_broken(openingd->ld->log,
"openchannel hook close_to address was"
" already set by other plugin. Ignoring!");
return true;
}
switch (json_to_address_scriptpubkey(tmpctx, chainparams,
buffer, t_closeto,
&payload->our_upfront_shutdown_script)) {
case ADDRESS_PARSE_UNRECOGNIZED:
fatal("Plugin returned an invalid response to"
" the openchannel.close_to hook: %.*s",
t_closeto->end - t_closeto->start,
buffer + t_closeto->start);
case ADDRESS_PARSE_WRONG_NETWORK:
fatal("Plugin returned invalid response to the"
" openchannel.close_to hook: address %s is"
" not on network %s",
tal_hex(NULL, payload->our_upfront_shutdown_script),
chainparams->network_name);
case ADDRESS_PARSE_SUCCESS:
break;
}
}
if (t_mindepth != NULL) {
json_to_u32(buffer, t_mindepth, &payload->uc->minimum_depth);
log_debug(
openingd->ld->log,
"Setting mindepth=%d for this channel as requested by "
"the openchannel hook",
payload->uc->minimum_depth);
}
return true;
}
REGISTER_PLUGIN_HOOK(openchannel,
openchannel_hook_deserialize,
openchannel_hook_final,
openchannel_hook_serialize,
struct openchannel_hook_payload *);
static void opening_got_offer(struct subd *openingd,
const u8 *msg,
struct uncommitted_channel *uc)
{
struct openchannel_hook_payload *payload;
payload = tal(openingd, struct openchannel_hook_payload);
payload->openingd = openingd;
payload->uc = uc;
payload->our_upfront_shutdown_script = NULL;
payload->errmsg = NULL;
if (!fromwire_openingd_got_offer(payload, msg,
&payload->funding_satoshis,
&payload->push_msat,
&payload->dust_limit_satoshis,
&payload->max_htlc_value_in_flight_msat,
&payload->channel_reserve_satoshis,
&payload->htlc_minimum_msat,
&payload->feerate_per_kw,
&payload->to_self_delay,
&payload->max_accepted_htlcs,
&payload->channel_flags,
&payload->shutdown_scriptpubkey)) {
log_broken(openingd->log, "Malformed opening_got_offer %s",
tal_hex(tmpctx, msg));
tal_free(openingd);
return;
}
tal_add_destructor2(openingd, openchannel_payload_remove_openingd, payload);
plugin_hook_call_openchannel(openingd->ld, payload);
}
static unsigned int openingd_msg(struct subd *openingd,
const u8 *msg, const int *fds)
{
enum openingd_wire t = fromwire_peektype(msg);
struct uncommitted_channel *uc = openingd->channel;
switch (t) {
case WIRE_OPENINGD_FUNDER_REPLY:
if (!uc->fc) {
log_broken(openingd->log, "Unexpected FUNDER_REPLY %s",
tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
if (tal_count(fds) != 1)
return 1;
opening_funder_finished(openingd, msg, fds, uc->fc);
return 0;
case WIRE_OPENINGD_FUNDER_START_REPLY:
if (!uc->fc) {
log_broken(openingd->log, "Unexpected FUNDER_START_REPLY %s",
tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
opening_funder_start_replied(openingd, msg, fds, uc->fc);
return 0;
case WIRE_OPENINGD_FAILED:
openingd_failed(openingd, msg, uc);
return 0;
case WIRE_OPENINGD_FUNDEE:
if (tal_count(fds) != 1)
return 1;
opening_fundee_finished(openingd, msg, fds, uc);
return 0;
case WIRE_OPENINGD_GOT_OFFER:
opening_got_offer(openingd, msg, uc);
return 0;
/* We send these! */
case WIRE_OPENINGD_INIT:
case WIRE_OPENINGD_FUNDER_START:
case WIRE_OPENINGD_FUNDER_COMPLETE:
case WIRE_OPENINGD_FUNDER_CANCEL:
case WIRE_OPENINGD_GOT_OFFER_REPLY:
case WIRE_OPENINGD_DEV_MEMLEAK:
/* Replies never get here */
case WIRE_OPENINGD_DEV_MEMLEAK_REPLY:
break;
}
log_broken(openingd->log, "Unexpected msg %s: %s",
openingd_wire_name(t), tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
bool peer_start_openingd(struct peer *peer, struct peer_fd *peer_fd)
{
int hsmfd;
u32 max_to_self_delay;
struct amount_msat min_effective_htlc_capacity;
struct uncommitted_channel *uc;
const u8 *msg;
assert(peer->uncommitted_channel);
uc = peer->uncommitted_channel;
assert(!uc->open_daemon);
hsmfd = hsm_get_client_fd(peer->ld, &uc->peer->id, uc->dbid,
HSM_CAP_COMMITMENT_POINT
| HSM_CAP_SIGN_REMOTE_TX);
uc->open_daemon = new_channel_subd(peer, peer->ld,
"lightning_openingd",
uc, &peer->id, uc->log,
true, openingd_wire_name,
openingd_msg,
opend_channel_errmsg,
opend_channel_set_billboard,
take(&peer_fd->fd),
take(&hsmfd), NULL);
if (!uc->open_daemon) {
uncommitted_channel_disconnect(uc, LOG_BROKEN,
tal_fmt(tmpctx,
"Running lightning_openingd: %s",
strerror(errno)));
tal_free(uc);
return false;
}
channel_config(peer->ld, &uc->our_config,
&max_to_self_delay,
&min_effective_htlc_capacity);
msg = towire_openingd_init(NULL,
chainparams,
peer->ld->our_features,
peer->their_features,
&uc->our_config,
max_to_self_delay,
min_effective_htlc_capacity,
&uc->local_basepoints,
&uc->local_funding_pubkey,
uc->minimum_depth,
feerate_min(peer->ld, NULL),
feerate_max(peer->ld, NULL),
IFDEV(peer->ld->dev_force_tmp_channel_id, NULL));
subd_send_msg(uc->open_daemon, take(msg));
return true;
}
static struct command_result *json_fundchannel_complete(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
u8 *msg;
struct node_id *id;
struct bitcoin_txid *funding_txid;
struct peer *peer;
struct wally_psbt *funding_psbt;
u32 *funding_txout_num = NULL;
struct funding_channel *fc;
if (!param(cmd, buffer, params,
p_req("id", param_node_id, &id),
p_req("psbt", param_psbt, &funding_psbt),
NULL))
return command_param_failed();
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");
if (!peer->uncommitted_channel
|| !peer->uncommitted_channel->fc
|| !peer->uncommitted_channel->fc->inflight)
return command_fail(cmd, LIGHTNINGD, "No channel funding in progress.");
if (peer->uncommitted_channel->fc->cmd)
return command_fail(cmd, LIGHTNINGD, "Channel funding in progress.");
fc = peer->uncommitted_channel->fc;
/* Figure out the correct output, and perform sanity checks. */
for (size_t i = 0; i < funding_psbt->tx->num_outputs; i++) {
if (memeq(funding_psbt->tx->outputs[i].script,
funding_psbt->tx->outputs[i].script_len,
fc->funding_scriptpubkey,
tal_bytelen(fc->funding_scriptpubkey))) {
if (funding_txout_num)
return command_fail(cmd, FUNDING_PSBT_INVALID,
"Two outputs to open channel");
funding_txout_num = tal(cmd, u32);
*funding_txout_num = i;
}
}
if (!funding_txout_num)
return command_fail(cmd, FUNDING_PSBT_INVALID,
"No output to open channel");
/* Can't really check amounts for elements. */
if (!chainparams->is_elements
&& !amount_sat_eq(amount_sat(funding_psbt->tx->outputs
[*funding_txout_num].satoshi),
fc->funding_sats))
return command_fail(cmd, FUNDING_PSBT_INVALID,
"Output to open channel is %"PRIu64"sat,"
" should be %s",
funding_psbt->tx->outputs
[*funding_txout_num].satoshi,
type_to_string(tmpctx, struct amount_sat,
&fc->funding_sats));
funding_txid = tal(cmd, struct bitcoin_txid);
psbt_txid(NULL, funding_psbt, funding_txid, NULL);
/* Fun fact: our wire protocol only allows 16 bits for outnum.
* That is reflected in our encoding scheme for short_channel_id. */
if (*funding_txout_num > UINT16_MAX)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"Invalid parameter: funding tx vout too large %u",
*funding_txout_num);
/* Set the cmd to this new cmd */
peer->uncommitted_channel->fc->cmd = cmd;
msg = towire_openingd_funder_complete(NULL,
funding_txid,
*funding_txout_num,
peer->uncommitted_channel->fc->channel_type);
subd_send_msg(peer->uncommitted_channel->open_daemon, take(msg));
return command_still_pending(cmd);
}
/**
* json_fundchannel_cancel - Entrypoint for cancelling a channel which funding isn't broadcast
*/
static struct command_result *json_fundchannel_cancel(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct node_id *id;
struct peer *peer;
u8 *msg;
if (!param(cmd, buffer, params,
p_req("id", param_node_id, &id),
NULL))
return command_param_failed();
peer = peer_by_id(cmd->ld, id);
if (!peer) {
return command_fail(cmd, FUNDING_UNKNOWN_PEER, "Unknown peer");
}
if (peer->uncommitted_channel) {
if (!peer->uncommitted_channel->fc || !peer->uncommitted_channel->fc->inflight)
return command_fail(cmd, FUNDING_NOTHING_TO_CANCEL,
"No channel funding in progress.");
/* Make sure this gets notified if we succeed or cancel */
tal_arr_expand(&peer->uncommitted_channel->fc->cancels, cmd);
msg = towire_openingd_funder_cancel(NULL);
subd_send_msg(peer->uncommitted_channel->open_daemon, take(msg));
return command_still_pending(cmd);
}
log_debug(cmd->ld->log, "fundchannel_cancel no uncommitted_channel!");
/* Handle `fundchannel_cancel` after `fundchannel_complete`. */
return cancel_channel_before_broadcast(cmd, peer);
}
/**
* json_fundchannel_start - Entrypoint for funding a channel
*/
static struct command_result *json_fundchannel_start(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct funding_channel * fc = tal(cmd, struct funding_channel);
struct node_id *id;
struct peer *peer;
bool *announce_channel;
u32 *feerate_per_kw, *mindepth;
int fds[2];
struct amount_sat *amount;
struct amount_msat *push_msat;
u32 *upfront_shutdown_script_wallet_index;
struct channel_id tmp_channel_id;
fc->cmd = cmd;
fc->cancels = tal_arr(fc, struct command *, 0);
fc->uc = NULL;
fc->inflight = false;
fc->funding_scriptpubkey = NULL;
if (!param(fc->cmd, buffer, params,
p_req("id", param_node_id, &id),
p_req("amount", param_sat, &amount),
p_opt("feerate", param_feerate, &feerate_per_kw),
p_opt_def("announce", param_bool, &announce_channel, true),
p_opt("close_to", param_bitcoin_address, &fc->our_upfront_shutdown_script),
p_opt("push_msat", param_msat, &push_msat),
p_opt_def("mindepth", param_u32, &mindepth, cmd->ld->config.anchor_confirms),
NULL))
return command_param_failed();
if (push_msat && amount_msat_greater_sat(*push_msat, *amount))
return command_fail(cmd, FUND_CANNOT_AFFORD,
"Requested to push_msat of %s is greater than "
"available funding amount %s",
type_to_string(tmpctx, struct amount_msat, push_msat),
type_to_string(tmpctx, struct amount_sat, amount));
fc->funding_sats = *amount;
if (!feerate_per_kw) {
feerate_per_kw = tal(cmd, u32);
*feerate_per_kw = opening_feerate(cmd->ld->topology);
if (!*feerate_per_kw) {
return command_fail(cmd, LIGHTNINGD,
"Cannot estimate fees");
}
}
if (*feerate_per_kw < feerate_floor()) {
return command_fail(cmd, LIGHTNINGD,
"Feerate below feerate floor");
}
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");
}
if (peer->connected != PEER_CONNECTED)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer %s",
peer->connected == PEER_DISCONNECTED
? "not connected" : "still connecting");
temporary_channel_id(&tmp_channel_id);
if (!peer->uncommitted_channel) {
if (feature_negotiated(cmd->ld->our_features,
peer->their_features,
OPT_DUAL_FUND))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Peer negotiated"
" `option_dual_fund`,"
" must use `openchannel_init` not"
" `fundchannel_start`.");
log_debug(cmd->ld->log, "fundchannel_start: allocating uncommitted_channel");
peer->uncommitted_channel = new_uncommitted_channel(peer);
} else
log_debug(cmd->ld->log, "fundchannel_start: reusing uncommitted_channel");
if (peer->uncommitted_channel->fc) {
return command_fail(cmd, LIGHTNINGD, "Already funding channel");
}
if (peer->uncommitted_channel->got_offer) {
return command_fail(cmd, LIGHTNINGD,
"Have in-progress "
"`open_channel` from "
"peer");
}
peer->uncommitted_channel->cid = tmp_channel_id;
/* 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));
fc->push = push_msat ? *push_msat : AMOUNT_MSAT(0);
fc->channel_flags = OUR_CHANNEL_FLAGS;
if (!*announce_channel) {
fc->channel_flags &= ~CHANNEL_FLAGS_ANNOUNCE_CHANNEL;
log_info(peer->ld->log, "Will open private channel with node %s",
type_to_string(fc, struct node_id, id));
}
peer->uncommitted_channel->fc = tal_steal(peer->uncommitted_channel, fc);
fc->uc = peer->uncommitted_channel;
/* BOLT #2:
*
* The sender:
* - SHOULD set `minimum_depth` to a number of blocks it considers
* reasonable to avoid double-spending of the funding transaction.
*/
assert(mindepth != NULL);
fc->uc->minimum_depth = *mindepth;
/* Needs to be stolen away from cmd */
if (fc->our_upfront_shutdown_script)
fc->our_upfront_shutdown_script
= tal_steal(fc, fc->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(fc->cmd->ld->wallet,
fc->our_upfront_shutdown_script,
&found_wallet_index,
&is_p2sh)) {
upfront_shutdown_script_wallet_index = tal(tmpctx, u32);
*upfront_shutdown_script_wallet_index = found_wallet_index;
} else
upfront_shutdown_script_wallet_index = NULL;
fc->open_msg
= towire_openingd_funder_start(fc,
*amount,
fc->push,
fc->our_upfront_shutdown_script,
upfront_shutdown_script_wallet_index,
*feerate_per_kw,
&tmp_channel_id,
fc->channel_flags);
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) != 0) {
return command_fail(cmd, FUND_MAX_EXCEEDED,
"Failed to create socketpair: %s",
strerror(errno));
}
if (!peer_start_openingd(peer, new_peer_fd(cmd, fds[0]))) {
close(fds[1]);
/* FIXME: gets completed by failure path above! */
return command_its_complicated("completed by peer_start_openingd");
}
/* Tell it to start funding */
subd_send_msg(peer->uncommitted_channel->open_daemon, fc->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,
&peer->uncommitted_channel->cid)));
subd_send_fd(peer->ld->connectd, fds[1]);
return command_still_pending(cmd);
}
static struct channel *stub_chan(struct command *cmd,
u64 id,
struct node_id nodeid,
struct channel_id cid,
struct bitcoin_outpoint funding,
struct wireaddr_internal addr,
struct amount_sat funding_sats,
struct channel_type *type)
{
struct basepoints basepoints;
struct bitcoin_signature *sig;
struct channel *channel;
struct channel_config *our_config;
struct channel_config *their_config;
struct channel_info *channel_info;
struct lightningd *ld;
struct peer *peer;
struct pubkey localFundingPubkey;
struct pubkey pk;
struct short_channel_id *scid;
u32 blockht;
u32 feerate;
u8 *dummy_sig = tal_hexdata(cmd,
"30450221009b2e0eef267b94c3899fb0dc73750"
"12e2cee4c10348a068fe78d1b82b4b1403602207"
"7c3fad3adac2ddf33f415e45f0daf6658b7a0b09"
"647de4443938ae2dbafe2b9" "01",
144);
peer = new_peer(cmd->ld,
0,
&nodeid,
&addr,
false);
ld = cmd->ld;
feerate = FEERATE_FLOOR;
sig = tal(cmd, struct bitcoin_signature);
signature_from_der(dummy_sig,
tal_bytelen(dummy_sig)
,sig);
if (!pubkey_from_der(tal_hexdata(cmd,
type_to_string(tmpctx,
struct node_id,
&nodeid),
66),
33,
&pk))
{
fatal("Invalid node id!");
}
get_channel_basepoints(ld,
&nodeid,
id,
&basepoints,
&localFundingPubkey);
channel_info = tal(cmd,
struct channel_info);
our_config = tal(cmd, struct channel_config);
their_config = tal(cmd, struct channel_config);
/* FIXME: Makeake these a pointer, so they could be NULL */
memset(our_config, 0, sizeof(struct channel_config));
memset(their_config, 0, sizeof(struct channel_config));
channel_info->their_config = *their_config;
channel_info->theirbase = basepoints;
channel_info->remote_fundingkey = pk;
channel_info->remote_per_commit = pk;
channel_info->old_remote_per_commit = pk;
blockht = 100;
scid = tal(cmd, struct short_channel_id);
/*To indicate this is an stub channel we keep it's scid to 1x1x1.*/
if (!mk_short_channel_id(scid, 1, 1, 1))
fatal("Failed to make short channel 1x1x1!");
/* Channel Shell with Dummy data(mostly) */
channel = new_channel(peer, id,
NULL, /* No shachain yet */
CHANNELD_NORMAL,
LOCAL,
NULL,
"restored from static channel backup",
0, our_config,
0,
1, 1, 1,
&funding,
funding_sats,
AMOUNT_MSAT(0),
AMOUNT_SAT(0),
true, /* !remote_funding_locked */
scid,
scid,
scid,
&cid,
/* The three arguments below are msatoshi_to_us,
* msatoshi_to_us_min, and msatoshi_to_us_max.
* Because, this is a newly-funded channel,
* all three are same value. */
AMOUNT_MSAT(0),
AMOUNT_MSAT(0), /* msat_to_us_min */
AMOUNT_MSAT(0), /* msat_to_us_max */
NULL,
sig,
NULL, /* No HTLC sigs */
channel_info,
new_fee_states(cmd, LOCAL, &feerate),
NULL, /* No shutdown_scriptpubkey[REMOTE] */
NULL,
1, false,
NULL, /* No commit sent */
/* If we're fundee, could be a little before this
* in theory, but it's only used for timing out. */
get_network_blockheight(ld->topology),
FEERATE_FLOOR,
funding_sats.satoshis / MINIMUM_TX_WEIGHT * 1000 /* Raw: convert to feerate */,
&basepoints,
&localFundingPubkey,
NULL,
ld->config.fee_base,
ld->config.fee_per_satoshi,
NULL,
0, 0,
type,
NUM_SIDES, /* closer not yet known */
REASON_REMOTE,
NULL,
take(new_height_states(ld->wallet, LOCAL,
&blockht)),
0, NULL, 0, 0, /* No leases on v1s */
ld->config.htlc_minimum_msat,
ld->config.htlc_maximum_msat);
return channel;
}
static struct command_result *json_recoverchannel(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
const jsmntok_t *scb, *t;
size_t i;
struct json_stream *response;
struct scb_chan *scb_chan = tal(cmd, struct scb_chan);
if (!param(cmd, buffer, params,
p_req("scb", param_array, &scb),
NULL))
return command_param_failed();
response = json_stream_success(cmd);
json_array_start(response, "stubs");
json_for_each_arr(i,t,scb){
char *token = json_strdup(tmpctx, buffer, t);
const u8 *scb_arr = tal_hexdata(cmd, token, strlen(token));
size_t scblen = tal_count(scb_arr);
scb_chan = fromwire_scb_chan(cmd ,&scb_arr, &scblen);
if (scb_chan == NULL) {
log_broken(cmd->ld->log, "SCB is invalid!");
continue;
}
struct lightningd *ld = cmd->ld;
struct channel *channel= stub_chan(cmd,
scb_chan->id,
scb_chan->node_id,
scb_chan->cid,
scb_chan->funding,
scb_chan->addr,
scb_chan->funding_sats,
scb_chan->type);
/* Now we put this in the database. */
wallet_channel_insert(ld->wallet, channel);
/* Watch the Funding */
channel_watch_funding(ld, channel);
json_add_channel_id(response, NULL, &scb_chan->cid);
}
/* This will try to reconnect to the peers and start
* initiating the process */
setup_peers(cmd->ld);
json_array_end(response);
return command_success(cmd, response);
}
static const struct json_command fundchannel_start_command = {
"fundchannel_start",
"channels",
json_fundchannel_start,
"Start fund channel with {id} using {amount} satoshis. "
"Returns a bech32 address to use as an output for a funding transaction."
};
AUTODATA(json_command, &fundchannel_start_command);
static const struct json_command fundchannel_cancel_command = {
"fundchannel_cancel",
"channels",
json_fundchannel_cancel,
"Cancel inflight channel establishment with peer {id}."
};
AUTODATA(json_command, &fundchannel_cancel_command);
static const struct json_command fundchannel_complete_command = {
"fundchannel_complete",
"channels",
json_fundchannel_complete,
"Complete channel establishment with peer {id} for funding transaction"
"with {psbt}. Returns true on success, false otherwise."
};
AUTODATA(json_command, &fundchannel_complete_command);
static const struct json_command json_commitchan_command = {
"recoverchannel",
"channels",
json_recoverchannel,
"Populate the DB with a channel and peer"
"Used for recovering the channel using DLP."
"This needs param in the form of an array [scb1,scb2,...]"
};
AUTODATA(json_command, &json_commitchan_command);
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