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864f2f3e21
core-lightning/lightningd/opening_control.c
niftynei 864f2f3e21 channel_id: save to database, dont derive from funding_txid 
v2 channel open uses a different method to derive the channel_id, so now
we save it to the database so that we dont have to remember how to
derive it for each.

includes a migration for existing channels
2020-09-09 19:54:20 +09:30

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#include "bitcoin/feerate.h"
#include <bitcoin/privkey.h>
#include <bitcoin/script.h>
#include <ccan/tal/str/str.h>
#include <common/addr.h>
#include <common/channel_config.h>
#include <common/features.h>
#include <common/fee_states.h>
#include <common/json_command.h>
#include <common/json_helpers.h>
#include <common/jsonrpc_errors.h>
#include <common/key_derive.h>
#include <common/param.h>
#include <common/penalty_base.h>
#include <common/per_peer_state.h>
#include <common/utils.h>
#include <common/wire_error.h>
#include <connectd/connectd_wiregen.h>
#include <errno.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel_control.h>
#include <lightningd/closing_control.h>
#include <lightningd/hsm_control.h>
#include <lightningd/json.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/notification.h>
#include <lightningd/opening_control.h>
#include <lightningd/options.h>
#include <lightningd/plugin_hook.h>
#include <lightningd/subd.h>
#include <openingd/openingd_wiregen.h>
#include <string.h>
#include <wire/common_wiregen.h>
#include <wire/wire.h>
#include <wire/wire_sync.h>
/* Channel we're still opening. */
struct uncommitted_channel {
/* peer->uncommitted_channel == this */
struct peer *peer;
/* openingd which is running now */
struct subd *openingd;
/* Reserved dbid for if we become a real struct channel */
u64 dbid;
/* For logging */
struct log *log;
/* Openingd can tell us stuff. */
const char *transient_billboard;
/* If we offered channel, this contains information, otherwise NULL */
struct funding_channel *fc;
/* Our basepoints for the channel. */
struct basepoints local_basepoints;
/* Public key for funding tx. */
struct pubkey local_funding_pubkey;
/* These are *not* filled in by new_uncommitted_channel: */
/* Minimum funding depth (if opener == REMOTE). */
u32 minimum_depth;
/* Our channel config. */
struct channel_config our_config;
};
struct funding_channel {
struct command *cmd; /* Which initially owns us until openingd request */
struct wallet_tx *wtx;
struct amount_msat push;
struct amount_sat funding;
u8 channel_flags;
const u8 *our_upfront_shutdown_script;
/* Variables we need to compose fields in cmd's response */
const char *hextx;
struct channel_id cid;
/* Peer we're trying to reach. */
struct pubkey peerid;
/* Channel, subsequent owner of us */
struct uncommitted_channel *uc;
/* Whether or not this is in the middle of getting funded */
bool inflight;
/* Any commands trying to cancel us. */
struct command **cancels;
};
static void uncommitted_channel_disconnect(struct uncommitted_channel *uc,
enum log_level level,
const char *desc)
{
u8 *msg = towire_connectd_peer_disconnected(tmpctx, &uc->peer->id);
log_(uc->log, level, NULL, false, "%s", desc);
subd_send_msg(uc->peer->ld->connectd, msg);
if (uc->fc && uc->fc->cmd)
was_pending(command_fail(uc->fc->cmd, LIGHTNINGD, "%s", desc));
notify_disconnect(uc->peer->ld, &uc->peer->id);
}
void kill_uncommitted_channel(struct uncommitted_channel *uc,
const char *why)
{
log_info(uc->log, "Killing openingd: %s", why);
/* Close openingd. */
subd_release_channel(uc->openingd, uc);
uc->openingd = NULL;
uncommitted_channel_disconnect(uc, LOG_INFORM, why);
tal_free(uc);
}
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, "funding", "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)
&& 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_txid *funding_txid,
u16 funding_outnum,
struct amount_sat funding,
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)
{
struct channel *channel;
struct amount_msat our_msat;
struct amount_sat local_funding;
s64 final_key_idx;
bool option_static_remotekey;
bool option_anchor_outputs;
/* 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, 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));
return NULL;
}
local_funding = funding;
} else {
our_msat = push;
local_funding = AMOUNT_SAT(0);
}
channel_info->fee_states = new_fee_states(uc, uc->fc ? LOCAL : REMOTE,
&feerate);
/* old_remote_per_commit not valid yet, copy valid one. */
channel_info->old_remote_per_commit = channel_info->remote_per_commit;
/* BOLT-a12da24dd0102c170365124782b46d9710950ac1 #2:
* 1. type: 35 (`funding_signed`)
* 2. data:
* * [`channel_id`:`channel_id`]
* * [`signature`:`signature`]
*
* #### Requirements
*
* Both peers:
* - if `option_static_remotekey` or `option_anchor_outputs` was negotiated:
* - `option_static_remotekey` or `option_anchor_outputs` applies to all commitment
* transactions
* - otherwise:
* - `option_static_remotekey` or `option_anchor_outputs` does not apply to any commitment
* transactions
*/
/* i.e. We set it now for the channel permanently. */
option_static_remotekey
= feature_negotiated(ld->our_features,
uc->peer->their_features,
OPT_STATIC_REMOTEKEY);
option_anchor_outputs
= feature_negotiated(ld->our_features,
uc->peer->their_features,
OPT_ANCHOR_OUTPUTS);
channel = new_channel(uc->peer, uc->dbid,
NULL, /* No shachain yet */
CHANNELD_AWAITING_LOCKIN,
uc->fc ? LOCAL : REMOTE,
uc->log,
take(uc->transient_billboard),
channel_flags,
&uc->our_config,
uc->minimum_depth,
1, 1, 0,
funding_txid,
funding_outnum,
funding,
push,
local_funding,
false, /* !remote_funding_locked */
NULL, /* no scid 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,
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,
/* We are connected */
true,
&uc->local_basepoints,
&uc->local_funding_pubkey,
NULL,
ld->config.fee_base,
ld->config.fee_per_satoshi,
remote_upfront_shutdown_script,
option_static_remotekey,
option_anchor_outputs);
/* Now we finally put it in the database. */
wallet_channel_insert(ld->wallet, channel);
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,
u8 *scriptPubkey,
bool supports_shutdown)
{
struct json_stream *response;
struct command *cmd = fc->cmd;
char *out;
response = json_stream_success(cmd);
out = encode_scriptpubkey_to_addr(cmd,
chainparams,
scriptPubkey);
if (out) {
json_add_string(response, "funding_address", out);
json_add_hex_talarr(response, "scriptpubkey", scriptPubkey);
if (fc->our_upfront_shutdown_script)
json_add_hex_talarr(response, "close_to", fc->our_upfront_shutdown_script);
}
/* 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)
{
u8 *funding_scriptPubkey;
bool supports_shutdown_script;
if (!fromwire_openingd_funder_start_reply(resp, resp,
&funding_scriptPubkey,
&supports_shutdown_script)) {
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, funding_scriptPubkey, supports_shutdown_script);
/* Mark that we're in-flight */
fc->inflight = true;
return;
failed:
subd_release_channel(openingd, fc->uc);
fc->uc->openingd = NULL;
/* Frees fc too, and tmpctx */
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_txid funding_txid;
u16 funding_txout;
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 per_peer_state *pps;
struct penalty_base *pbase;
/* 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,
&pps,
&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_txid,
&funding_txout,
&feerate,
&fc->uc->our_config.channel_reserve,
&remote_upfront_shutdown_script)) {
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;
per_peer_state_set_fds_arr(pps, 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_txid, funding_txout);
/* Steals fields from uc */
channel = wallet_commit_channel(ld, fc->uc,
&cid,
remote_commit,
&remote_commit_sig,
&funding_txid,
funding_txout,
fc->funding,
fc->push,
fc->channel_flags,
&channel_info,
feerate,
fc->our_upfront_shutdown_script,
remote_upfront_shutdown_script);
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, pps, NULL, false);
cleanup:
subd_release_channel(openingd, fc->uc);
fc->uc->openingd = NULL;
/* Frees fc too, and tmpctx */
tal_free(fc->uc);
}
static void opening_fundee_finished(struct subd *openingd,
const u8 *reply,
const int *fds,
struct uncommitted_channel *uc)
{
u8 *funding_signed;
struct channel_info channel_info;
struct bitcoin_signature remote_commit_sig;
struct bitcoin_tx *remote_commit;
struct channel_id cid;
struct lightningd *ld = openingd->ld;
struct bitcoin_txid funding_txid;
u16 funding_outnum;
struct amount_sat funding;
struct amount_msat push;
u32 feerate;
u8 channel_flags;
struct channel *channel;
u8 *remote_upfront_shutdown_script, *local_upfront_shutdown_script;
struct per_peer_state *pps;
struct penalty_base *pbase;
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;
if (!fromwire_openingd_fundee(tmpctx, reply,
&channel_info.their_config,
&remote_commit,
&pbase,
&remote_commit_sig,
&pps,
&channel_info.theirbase.revocation,
&channel_info.theirbase.payment,
&channel_info.theirbase.htlc,
&channel_info.theirbase.delayed_payment,
&channel_info.remote_per_commit,
&channel_info.remote_fundingkey,
&funding_txid,
&funding_outnum,
&funding,
&push,
&channel_flags,
&feerate,
&funding_signed,
&uc->our_config.channel_reserve,
&local_upfront_shutdown_script,
&remote_upfront_shutdown_script)) {
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;
per_peer_state_set_fds_arr(pps, fds);
/* openingd should never accept them funding channel in this case. */
if (peer_active_channel(uc->peer)) {
uncommitted_channel_disconnect(uc,
LOG_BROKEN,
"already have active channel");
goto failed;
}
derive_channel_id(&cid, &funding_txid, funding_outnum);
/* Consumes uc */
channel = wallet_commit_channel(ld, uc,
&cid,
remote_commit,
&remote_commit_sig,
&funding_txid,
funding_outnum,
funding,
push,
channel_flags,
&channel_info,
feerate,
local_upfront_shutdown_script,
remote_upfront_shutdown_script);
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,
&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, pps, funding_signed, false);
subd_release_channel(openingd, uc);
uc->openingd = NULL;
tal_free(uc);
return;
failed:
close(fds[0]);
close(fds[1]);
close(fds[3]);
tal_free(uc);
}
static void opening_funder_failed(struct subd *openingd, const u8 *msg,
struct uncommitted_channel *uc)
{
char *desc;
if (!fromwire_openingd_funder_failed(msg, msg, &desc)) {
log_broken(uc->log,
"bad OPENING_FUNDER_FAILED %s",
tal_hex(tmpctx, msg));
was_pending(command_fail(uc->fc->cmd, LIGHTNINGD,
"bad OPENING_FUNDER_FAILED %s",
tal_hex(uc->fc->cmd, msg)));
tal_free(uc);
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. */
uc->fc = tal_free(uc->fc);
}
static void opening_channel_errmsg(struct uncommitted_channel *uc,
struct per_peer_state *pps,
const struct channel_id *channel_id UNUSED,
const char *desc,
bool soft_error UNUSED,
const u8 *err_for_them UNUSED)
{
/* Close fds, if any. */
tal_free(pps);
uncommitted_channel_disconnect(uc, LOG_INFORM, desc);
tal_free(uc);
}
/* There's nothing permanent in an unconfirmed transaction */
static void opening_channel_set_billboard(struct uncommitted_channel *uc,
bool perm UNUSED,
const char *happenings TAKES)
{
uc->transient_billboard = tal_free(uc->transient_billboard);
if (happenings)
uc->transient_billboard = tal_strdup(uc, happenings);
}
static void destroy_uncommitted_channel(struct uncommitted_channel *uc)
{
if (uc->openingd) {
struct subd *openingd = uc->openingd;
uc->openingd = NULL;
subd_release_channel(openingd, uc);
}
/* This is how shutdown_subdaemons tells us not to delete from db! */
if (!uc->peer->uncommitted_channel)
return;
uc->peer->uncommitted_channel = NULL;
maybe_delete_peer(uc->peer);
}
static struct uncommitted_channel *
new_uncommitted_channel(struct peer *peer)
{
struct lightningd *ld = peer->ld;
struct uncommitted_channel *uc = tal(ld, struct uncommitted_channel);
uc->peer = peer;
assert(!peer->uncommitted_channel);
uc->transient_billboard = NULL;
uc->dbid = wallet_get_channel_dbid(ld->wallet);
uc->log = new_log(uc, ld->log_book, &uc->peer->id,
"chan#%"PRIu64, uc->dbid);
uc->fc = NULL;
uc->our_config.id = 0;
get_channel_basepoints(ld, &uc->peer->id, uc->dbid,
&uc->local_basepoints, &uc->local_funding_pubkey);
uc->peer->uncommitted_channel = uc;
tal_add_destructor(uc, destroy_uncommitted_channel);
return uc;
}
static void channel_config(struct lightningd *ld,
struct channel_config *ours,
u32 *max_to_self_delay,
struct amount_msat *min_effective_htlc_capacity)
{
/* FIXME: depend on feerate. */
*max_to_self_delay = ld->config.locktime_max;
/* Take minimal effective capacity from config min_capacity_sat */
if (!amount_sat_to_msat(min_effective_htlc_capacity,
amount_sat(ld->config.min_capacity_sat)))
fatal("amount_msat overflow for config.min_capacity_sat");
/* BOLT #2:
*
* The sending node SHOULD:
*...
* - set `dust_limit_satoshis` to a sufficient value to allow
* commitment transactions to propagate through the Bitcoin network.
*/
ours->dust_limit = chainparams->dust_limit;
ours->max_htlc_value_in_flight = AMOUNT_MSAT(UINT64_MAX);
/* Don't care */
ours->htlc_minimum = AMOUNT_MSAT(0);
/* BOLT #2:
*
* The sending node SHOULD:
* - set `to_self_delay` sufficient to ensure the sender can
* irreversibly spend a commitment transaction output, in case of
* misbehavior by the receiver.
*/
ours->to_self_delay = ld->config.locktime_blocks;
ours->max_accepted_htlcs = ld->config.max_concurrent_htlcs;
/* This is filled in by lightning_openingd, for consistency. */
ours->channel_reserve = AMOUNT_SAT(UINT64_MAX);
}
struct openchannel_hook_payload {
struct subd *openingd;
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 uncommitted_channel *uc = payload->openingd->channel;
json_object_start(stream, "openchannel");
json_add_node_id(stream, "id", &uc->peer->id);
json_add_amount_sat_only(stream, "funding_satoshis",
payload->funding_satoshis);
json_add_amount_msat_only(stream, "push_msat", payload->push_msat);
json_add_amount_sat_only(stream, "dust_limit_satoshis",
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_sat_only(stream, "channel_reserve_satoshis",
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;
/* 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);
subd_send_msg(openingd,
take(towire_openingd_got_offer_reply(NULL, errmsg,
our_upfront_shutdown_script)));
}
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");
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_unusual(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;
}
}
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;
/* Tell them they can't open, if we already have open channel. */
if (peer_active_channel(uc->peer)) {
subd_send_msg(openingd,
take(towire_openingd_got_offer_reply(NULL,
"Already have active channel", NULL)));
return;
}
payload = tal(openingd, struct openchannel_hook_payload);
payload->openingd = openingd;
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) != 3)
return 3;
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_FUNDER_FAILED:
if (!uc->fc) {
log_unusual(openingd->log, "Unexpected FUNDER_FAILED %s",
tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
opening_funder_failed(openingd, msg, uc);
return 0;
case WIRE_OPENINGD_FUNDEE:
if (tal_count(fds) != 3)
return 3;
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;
}
switch ((enum common_wire)t) {
#if DEVELOPER
case WIRE_CUSTOMMSG_IN:
handle_custommsg_in(openingd->ld, openingd->node_id, msg);
return 0;
#else
case WIRE_CUSTOMMSG_IN:
#endif
/* We send these. */
case WIRE_CUSTOMMSG_OUT:
break;
}
log_broken(openingd->log, "Unexpected msg %s: %s",
openingd_wire_name(t), tal_hex(tmpctx, msg));
tal_free(openingd);
return 0;
}
void peer_start_openingd(struct peer *peer,
struct per_peer_state *pps,
const u8 *send_msg)
{
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 = new_uncommitted_channel(peer);
hsmfd = hsm_get_client_fd(peer->ld, &uc->peer->id, uc->dbid,
HSM_CAP_COMMITMENT_POINT
| HSM_CAP_SIGN_REMOTE_TX);
uc->openingd = new_channel_subd(peer->ld,
"lightning_openingd",
uc, &peer->id, uc->log,
true, openingd_wire_name,
openingd_msg,
opening_channel_errmsg,
opening_channel_set_billboard,
take(&pps->peer_fd),
take(&pps->gossip_fd),
take(&pps->gossip_store_fd),
take(&hsmfd), NULL);
if (!uc->openingd) {
uncommitted_channel_disconnect(uc, LOG_BROKEN,
tal_fmt(tmpctx,
"Running lightning_openingd: %s",
strerror(errno)));
tal_free(uc);
return;
}
channel_config(peer->ld, &uc->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.
*/
uc->minimum_depth = peer->ld->config.anchor_confirms;
msg = towire_openingd_init(NULL,
chainparams,
peer->ld->our_features,
&uc->our_config,
max_to_self_delay,
min_effective_htlc_capacity,
pps, &uc->local_basepoints,
&uc->local_funding_pubkey,
uc->minimum_depth,
feerate_min(peer->ld, NULL),
feerate_max(peer->ld, NULL),
peer->their_features,
feature_negotiated(peer->ld->our_features,
peer->their_features,
OPT_STATIC_REMOTEKEY),
feature_negotiated(peer->ld->our_features,
peer->their_features,
OPT_ANCHOR_OUTPUTS),
send_msg,
IFDEV(peer->ld->dev_force_tmp_channel_id, NULL),
IFDEV(peer->ld->dev_fast_gossip, false));
subd_send_msg(uc->openingd, take(msg));
}
static struct command_result *json_fund_channel_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 channel *channel;
u32 *funding_txout_num;
u16 funding_txout;
if (!param(cmd, buffer, params,
p_req("id", param_node_id, &id),
p_req("txid", param_txid, &funding_txid),
p_req("txout", param_number, &funding_txout_num),
NULL))
return command_param_failed();
if (*funding_txout_num > UINT16_MAX)
return command_fail(cmd, LIGHTNINGD,
"Invalid parameter: funding tx vout too large %u",
*funding_txout_num);
funding_txout = *funding_txout_num;
peer = peer_by_id(cmd->ld, id);
if (!peer) {
return command_fail(cmd, FUNDING_UNKNOWN_PEER, "Unknown peer");
}
channel = peer_active_channel(peer);
if (channel)
return command_fail(cmd, LIGHTNINGD, "Peer already %s",
channel_state_name(channel));
if (!peer->uncommitted_channel)
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected");
if (!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.");
/* Set the cmd to this new cmd */
peer->uncommitted_channel->fc->cmd = cmd;
msg = towire_openingd_funder_complete(NULL,
funding_txid,
funding_txout);
subd_send_msg(peer->uncommitted_channel->openingd, take(msg));
return command_still_pending(cmd);
}
/**
* json_fund_channel_cancel - Entrypoint for cancelling a channel which funding isn't broadcast
*/
static struct command_result *json_fund_channel_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->openingd, take(msg));
return command_still_pending(cmd);
}
/* Handle `fundchannel_cancel` after `fundchannel_complete`. */
return cancel_channel_before_broadcast(cmd, peer);
}
/**
* json_fund_channel_start - Entrypoint for funding a channel
*/
static struct command_result *json_fund_channel_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;
struct channel *channel;
bool *announce_channel;
u32 *feerate_per_kw;
u8 *msg = NULL;
struct amount_sat *amount;
struct amount_msat *push_msat;
fc->cmd = cmd;
fc->cancels = tal_arr(fc, struct command *, 0);
fc->uc = NULL;
fc->inflight = false;
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),
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 = *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");
}
channel = peer_active_channel(peer);
if (channel) {
return command_fail(cmd, LIGHTNINGD, "Peer already %s",
channel_state_name(channel));
}
if (!peer->uncommitted_channel) {
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected");
}
if (peer->uncommitted_channel->fc) {
return command_fail(cmd, LIGHTNINGD, "Already funding channel");
}
/* 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;
/* 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);
msg = towire_openingd_funder_start(NULL,
*amount,
fc->push,
fc->our_upfront_shutdown_script,
*feerate_per_kw,
fc->channel_flags);
subd_send_msg(peer->uncommitted_channel->openingd, take(msg));
return command_still_pending(cmd);
}
static const struct json_command fund_channel_start_command = {
"fundchannel_start",
"channels",
json_fund_channel_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, &fund_channel_start_command);
static const struct json_command fund_channel_cancel_command = {
"fundchannel_cancel",
"channels",
json_fund_channel_cancel,
"Cancel inflight channel establishment with peer {id}."
};
AUTODATA(json_command, &fund_channel_cancel_command);
static const struct json_command fund_channel_complete_command = {
"fundchannel_complete",
"channels",
json_fund_channel_complete,
"Complete channel establishment with peer {id} for funding transaction"
"with {txid}. Returns true on success, false otherwise."
};
AUTODATA(json_command, &fund_channel_complete_command);
#if DEVELOPER
/* Indented to avoid include ordering check */
#include <lightningd/memdump.h>
static void opening_died_forget_memleak(struct subd *openingd,
struct command *cmd)
{
/* FIXME: We ignore the remaining openingds in this case. */
opening_memleak_done(cmd, NULL);
}
/* Mutual recursion */
static void opening_memleak_req_next(struct command *cmd, struct peer *prev);
static void opening_memleak_req_done(struct subd *openingd,
const u8 *msg, const int *fds UNUSED,
struct command *cmd)
{
bool found_leak;
struct uncommitted_channel *uc = openingd->channel;
tal_del_destructor2(openingd, opening_died_forget_memleak, cmd);
if (!fromwire_openingd_dev_memleak_reply(msg, &found_leak)) {
was_pending(command_fail(cmd, LIGHTNINGD,
"Bad opening_dev_memleak"));
return;
}
if (found_leak) {
opening_memleak_done(cmd, openingd);
return;
}
opening_memleak_req_next(cmd, uc->peer);
}
static void opening_memleak_req_next(struct command *cmd, struct peer *prev)
{
struct peer *p;
list_for_each(&cmd->ld->peers, p, list) {
if (!p->uncommitted_channel)
continue;
if (p == prev) {
prev = NULL;
continue;
}
if (prev != NULL)
continue;
subd_req(p,
p->uncommitted_channel->openingd,
take(towire_openingd_dev_memleak(NULL)),
-1, 0, opening_memleak_req_done, cmd);
/* Just in case it dies before replying! */
tal_add_destructor2(p->uncommitted_channel->openingd,
opening_died_forget_memleak, cmd);
return;
}
opening_memleak_done(cmd, NULL);
}
void opening_dev_memleak(struct command *cmd)
{
opening_memleak_req_next(cmd, NULL);
}
#endif /* DEVELOPER */
struct subd *peer_get_owning_subd(struct peer *peer)
{
struct channel *channel;
channel = peer_active_channel(peer);
if (channel != NULL) {
return channel->owner;
} else if (peer->uncommitted_channel != NULL) {
return peer->uncommitted_channel->openingd;
}
return NULL;
}
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