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lightning/state.c

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#include <ccan/build_assert/build_assert.h>
#ifndef TEST_STATE_COVERAGE
#include <daemon/peer.h>
#endif
#include <state.h>
/* STATE_CLOSE* can be treated as a bitset offset from STATE_CLOSED */
#define BITS_TO_STATE(bits) (STATE_CLOSED + (bits))
#define STATE_TO_BITS(state) ((state) - STATE_CLOSED)
/* For the rare cases where state may not change */
static enum command_status next_state_nocheck(struct peer *peer,
enum command_status cstatus,
const enum state state)
{
peer->state = state;
return cstatus;
}
static enum command_status next_state(struct peer *peer,
enum command_status cstatus,
const enum state state)
{
assert(peer->state != state);
return next_state_nocheck(peer, cstatus, state);
}
/*
* Simple marker to note we don't update state.
*
* This happens in three cases:
* - We're ignoring packets while closing.
* - We stop watching an on-chain HTLC: we indicate that we want
* INPUT_NO_MORE_HTLCS when we get the last one.
* - HTLC add/remove in STATE_NORMAL.
*/
static enum command_status unchanged_state(enum command_status cstatus)
{
return cstatus;
}
/* This may not actually change the state. */
static enum command_status next_state_bits(struct peer *peer,
enum command_status cstatus,
unsigned int bits)
{
return next_state_nocheck(peer, cstatus, BITS_TO_STATE(bits));
}
static void set_peer_cond(struct peer *peer, enum state_peercond cond)
{
assert(peer->cond != cond);
peer->cond = cond;
}
static void change_peer_cond(struct peer *peer,
enum state_peercond old,
enum state_peercond new)
{
assert(peer->cond == old);
peer->cond = new;
}
static void complete_cmd(struct peer *peer, enum command_status *statusp,
enum command_status status)
{
change_peer_cond(peer, PEER_BUSY, PEER_CMD_OK);
*statusp = status;
}
/* FIXME: We do this when a command succeeds instantly, and
* state is unchanged. */
static enum command_status instant_cmd_success(struct peer *peer,
enum command_status cstatus)
{
assert(peer->cond == PEER_CMD_OK);
assert(cstatus == CMD_NONE);
return CMD_SUCCESS;
}
static void queue_tx_broadcast(const struct bitcoin_tx **broadcast,
const struct bitcoin_tx *tx)
{
assert(!*broadcast);
assert(tx);
*broadcast = tx;
}
enum command_status state(struct peer *peer,
const enum state_input input,
const union input *idata,
const struct bitcoin_tx **broadcast)
{
const struct bitcoin_tx *tx;
Pkt *err;
enum command_status cstatus = CMD_NONE;
*broadcast = NULL;
switch (peer->state) {
/*
* Initial channel opening states.
*/
case STATE_INIT:
if (input_is(input, CMD_OPEN_WITH_ANCHOR)) {
queue_pkt_open(peer,
OPEN_CHANNEL__ANCHOR_OFFER__WILL_CREATE_ANCHOR);
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_OPEN_WITHANCHOR);
} else if (input_is(input, CMD_OPEN_WITHOUT_ANCHOR)) {
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
queue_pkt_open(peer,
OPEN_CHANNEL__ANCHOR_OFFER__WONT_CREATE_ANCHOR);
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_OPEN_NOANCHOR);
}
break;
case STATE_OPEN_WAIT_FOR_OPEN_NOANCHOR:
if (input_is(input, PKT_OPEN)) {
err = accept_pkt_open(peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_close_nocleanup;
}
return next_state(peer, cstatus, STATE_OPEN_WAIT_FOR_ANCHOR);
} else if (input_is(input, CMD_CLOSE)
|| input_is(input, INPUT_CONNECTION_LOST)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto instant_close;
} else if (input_is_pkt(input)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt_nocleanup;
}
break;
case STATE_OPEN_WAIT_FOR_OPEN_WITHANCHOR:
if (input_is(input, PKT_OPEN)) {
err = accept_pkt_open(peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_close_nocleanup;
}
bitcoin_create_anchor(peer, BITCOIN_ANCHOR_CREATED);
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_ANCHOR_CREATE);
} else if (input_is(input, CMD_CLOSE)
|| input_is(input, INPUT_CONNECTION_LOST)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto instant_close;
} else if (input_is_pkt(input)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt_nocleanup;
}
break;
case STATE_OPEN_WAIT_FOR_ANCHOR_CREATE:
if (input_is(input, BITCOIN_ANCHOR_CREATED)) {
queue_pkt_anchor(peer);
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_COMMIT_SIG);
} else if (input_is(input, CMD_CLOSE)
|| input_is(input, INPUT_CONNECTION_LOST)) {
bitcoin_release_anchor(peer, BITCOIN_ANCHOR_CREATED);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto instant_close;
} else if (input_is_pkt(input)) {
bitcoin_release_anchor(peer, BITCOIN_ANCHOR_CREATED);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt_nocleanup;
}
break;
case STATE_OPEN_WAIT_FOR_ANCHOR:
if (input_is(input, PKT_OPEN_ANCHOR)) {
err = accept_pkt_anchor(peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_close_nocleanup;
}
queue_pkt_open_commit_sig(peer);
peer_watch_anchor(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT,
BITCOIN_ANCHOR_UNSPENT,
BITCOIN_ANCHOR_THEIRSPEND,
BITCOIN_ANCHOR_OTHERSPEND);
return next_state(peer, cstatus,
STATE_OPEN_WAITING_THEIRANCHOR);
} else if (input_is(input, CMD_CLOSE)
|| input_is(input, INPUT_CONNECTION_LOST)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto instant_close;
} else if (input_is_pkt(input)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt_nocleanup;
}
break;
case STATE_OPEN_WAIT_FOR_COMMIT_SIG:
if (input_is(input, PKT_OPEN_COMMIT_SIG)) {
err = accept_pkt_open_commit_sig(peer, idata->pkt);
if (err) {
bitcoin_release_anchor(peer, INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_start_unilateral_close;
}
queue_tx_broadcast(broadcast, bitcoin_anchor(peer));
peer_watch_anchor(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE,
BITCOIN_ANCHOR_UNSPENT,
BITCOIN_ANCHOR_THEIRSPEND,
BITCOIN_ANCHOR_OTHERSPEND);
return next_state(peer, cstatus,
STATE_OPEN_WAITING_OURANCHOR);
} else if (input_is(input, CMD_CLOSE)
|| input_is(input, INPUT_CONNECTION_LOST)) {
bitcoin_release_anchor(peer, INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto instant_close;
} else if (input_is_pkt(input)) {
bitcoin_release_anchor(peer, INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt_nocleanup;
}
break;
case STATE_OPEN_WAITING_OURANCHOR:
if (input_is(input, PKT_OPEN_COMPLETE)) {
err = accept_pkt_open_complete(peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE);
goto err_start_unilateral_close;
}
return next_state(peer, cstatus,
STATE_OPEN_WAITING_OURANCHOR_THEYCOMPLETED);
}
/* Fall thru */
case STATE_OPEN_WAITING_OURANCHOR_THEYCOMPLETED:
if (input_is(input, BITCOIN_ANCHOR_DEPTHOK)) {
queue_pkt_open_complete(peer);
if (peer->state == STATE_OPEN_WAITING_OURANCHOR_THEYCOMPLETED) {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus, STATE_NORMAL);
}
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_COMPLETE_OURANCHOR);
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
/* This should be impossible. */
return next_state(peer, cstatus, STATE_ERR_INFORMATION_LEAK);
} else if (input_is(input, CMD_CLOSE)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_clearing;
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_unilateral_close;
} else if (input_is(input, PKT_CLOSE_CLEARING)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto accept_clearing;
} else if (input_is_pkt(input)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt;
}
break;
case STATE_OPEN_WAITING_THEIRANCHOR:
if (input_is(input, PKT_OPEN_COMPLETE)) {
err = accept_pkt_open_complete(peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT);
goto err_start_unilateral_close;
}
return next_state(peer, cstatus,
STATE_OPEN_WAITING_THEIRANCHOR_THEYCOMPLETED);
}
/* Fall thru */
case STATE_OPEN_WAITING_THEIRANCHOR_THEYCOMPLETED:
if (input_is(input, BITCOIN_ANCHOR_TIMEOUT)) {
/* Anchor didn't reach blockchain in reasonable time. */
queue_pkt_err(peer, pkt_err(peer, "Anchor timed out"));
return next_state(peer, cstatus, STATE_ERR_ANCHOR_TIMEOUT);
} else if (input_is(input, BITCOIN_ANCHOR_DEPTHOK)) {
queue_pkt_open_complete(peer);
if (peer->state == STATE_OPEN_WAITING_THEIRANCHOR_THEYCOMPLETED) {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus, STATE_NORMAL);
}
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_COMPLETE_THEIRANCHOR);
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
/* This should be impossible. */
return next_state(peer, cstatus,
STATE_ERR_INFORMATION_LEAK);
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto them_unilateral;
} else if (input_is(input, CMD_CLOSE)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_clearing;
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_unilateral_close;
} else if (input_is(input, PKT_CLOSE_CLEARING)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto accept_clearing;
} else if (input_is_pkt(input)) {
/* We no longer care about anchor depth. */
peer_unwatch_anchor_depth(peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt;
}
break;
case STATE_OPEN_WAIT_FOR_COMPLETE_OURANCHOR:
case STATE_OPEN_WAIT_FOR_COMPLETE_THEIRANCHOR:
if (input_is(input, PKT_OPEN_COMPLETE)) {
/* Ready for business! Anchorer goes first. */
if (peer->state == STATE_OPEN_WAIT_FOR_COMPLETE_OURANCHOR) {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus, STATE_NORMAL);
} else {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus, STATE_NORMAL);
}
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto anchor_unspent;
/* Nobody should be able to spend anchor, except via the
* commit txs. */
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
return next_state(peer, cstatus,
STATE_ERR_INFORMATION_LEAK);
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto them_unilateral;
} else if (input_is(input, CMD_CLOSE)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_clearing;
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_unilateral_close;
} else if (input_is(input, PKT_CLOSE_CLEARING)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto accept_clearing;
} else if (input_is_pkt(input)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt;
}
break;
/*
* Channel normal operating states.
*/
case STATE_NORMAL:
/*
* FIXME: For simplicity, we disallow new staging requests
* while a commit is outstanding.
*/
/* You can only issue this command one at a time. */
if (input_is(input, CMD_SEND_COMMIT)) {
queue_pkt_commit(peer);
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
return next_state(peer, cstatus, STATE_NORMAL_COMMITTING);
} else if (input_is(input, CMD_SEND_HTLC_ADD)) {
/* We are to send an HTLC add. */
queue_pkt_htlc_add(peer, idata->htlc_prog);
return instant_cmd_success(peer, cstatus);
} else if (input_is(input, CMD_SEND_HTLC_FULFILL)) {
/* We are to send an HTLC fulfill. */
queue_pkt_htlc_fulfill(peer, idata->htlc_prog);
return instant_cmd_success(peer, cstatus);
} else if (input_is(input, CMD_SEND_HTLC_FAIL)) {
/* We are to send an HTLC fail. */
queue_pkt_htlc_fail(peer, idata->htlc_prog);
return instant_cmd_success(peer, cstatus);
}
/* Fall through... */
case STATE_NORMAL_COMMITTING:
/* Only expect revocation in STATE_NORMAL_COMMITTING */
if (peer->state == STATE_NORMAL_COMMITTING
&& input_is(input, PKT_UPDATE_REVOCATION)) {
err = accept_pkt_revocation(peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_start_unilateral_close;
}
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus, STATE_NORMAL);
}
if (input_is(input, CMD_CLOSE)) {
goto start_clearing;
} else if (input_is(input, PKT_UPDATE_ADD_HTLC)) {
err = accept_pkt_htlc_add(peer, idata->pkt);
if (err)
goto err_start_unilateral_close;
return unchanged_state(cstatus);
} else if (input_is(input, PKT_UPDATE_FULFILL_HTLC)) {
err = accept_pkt_htlc_fulfill(peer, idata->pkt);
if (err)
goto err_start_unilateral_close;
return unchanged_state(cstatus);
} else if (input_is(input, PKT_UPDATE_FAIL_HTLC)) {
err = accept_pkt_htlc_fail(peer, idata->pkt);
if (err)
goto err_start_unilateral_close;
return unchanged_state(cstatus);
} else if (input_is(input, PKT_UPDATE_COMMIT)) {
err = accept_pkt_commit(peer, idata->pkt);
if (err)
goto err_start_unilateral_close;
queue_pkt_revocation(peer);
return unchanged_state(cstatus);
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
goto old_commit_spotted;
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
goto anchor_unspent;
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
goto start_unilateral_close;
} else if (input_is(input, PKT_CLOSE_CLEARING)) {
goto accept_clearing;
} else if (input_is_pkt(input)) {
goto unexpected_pkt;
}
break;
case STATE_US_CLEARING:
/* This is their reply once they're clearing too. */
if (input_is(input, PKT_CLOSE_CLEARING)) {
err = accept_pkt_close_clearing(peer, idata->pkt);
if (err)
goto err_start_unilateral_close;
/* Notify us when there are no more htlcs in
* either commit tx */
peer_watch_htlcs_cleared(peer, INPUT_HTLCS_CLEARED);
return next_state(peer, cstatus, STATE_BOTH_CLEARING);
/* FIXME: We must continue to allow fulfill & fail! */
} else if (input_is(input, CMD_SEND_HTLC_FAIL)
|| input_is(input, CMD_SEND_HTLC_FULFILL)) {
err = pkt_err(peer, "FIXME: cmd during clearing.");
goto err_start_unilateral_close;
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
goto start_unilateral_close;
} else if (input_is_pkt(input)) {
/* FIXME: We must continue to allow add, fulfill & fail packets */
goto unexpected_pkt;
}
break;
case STATE_BOTH_CLEARING:
if (input_is(input, INPUT_HTLCS_CLEARED)) {
goto start_closing_cleared;
} else if (input_is(input, CMD_SEND_HTLC_FAIL)
|| input_is(input, CMD_SEND_HTLC_FULFILL)) {
err = pkt_err(peer, "FIXME: cmd during clearing.");
goto err_start_unilateral_close;
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
goto start_unilateral_close;
} else if (input_is_pkt(input)) {
/* FIXME: We must continue to allow fulfill & fail packets */
goto unexpected_pkt;
}
break;
case STATE_WAIT_FOR_CLOSE_SIG:
if (input_is(input, PKT_CLOSE_SIGNATURE)) {
bool acked, we_agree;
err = accept_pkt_close_sig(peer, idata->pkt,
&acked, &we_agree);
if (err)
goto err_start_unilateral_close;
/* Are we about to offer the same fee they did? */
if (we_agree) {
/* Offer the new fee. */
queue_pkt_close_signature(peer);
acked = true;
}
/* Do fees now match? */
if (acked) {
peer_unwatch_close_timeout(peer,
INPUT_CLOSE_COMPLETE_TIMEOUT);
/* Send close TX. */
queue_tx_broadcast(broadcast,
bitcoin_close(peer));
change_peer_cond(peer,
PEER_CLOSING, PEER_CLOSED);
return next_state(peer, cstatus,
STATE_CLOSE_WAIT_CLOSE);
}
/* Offer the new fee. */
queue_pkt_close_signature(peer);
return unchanged_state(cstatus);
} else if (input_is(input, INPUT_CONNECTION_LOST)) {
goto start_unilateral_close;
} else if (input_is(input, INPUT_CLOSE_COMPLETE_TIMEOUT)) {
err = pkt_err(peer, "Close timed out");
goto err_start_unilateral_close;
} else if (input_is_pkt(input)) {
goto unexpected_pkt;
}
break;
/* Close states are regular: handle as a group. */
case STATE_CLOSE_WAIT_HTLCS:
case STATE_CLOSE_WAIT_STEAL:
case STATE_CLOSE_WAIT_SPENDTHEM:
case STATE_CLOSE_WAIT_SPENDTHEM_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_WITH_HTLCS:
case STATE_CLOSE_WAIT_CLOSE:
case STATE_CLOSE_WAIT_STEAL_CLOSE:
case STATE_CLOSE_WAIT_SPENDTHEM_CLOSE:
case STATE_CLOSE_WAIT_SPENDTHEM_CLOSE_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_CLOSE:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_CLOSE_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_OURCOMMIT:
case STATE_CLOSE_WAIT_STEAL_OURCOMMIT_WITH_HTLCS:
case STATE_CLOSE_WAIT_SPENDTHEM_OURCOMMIT:
case STATE_CLOSE_WAIT_SPENDTHEM_OURCOMMIT_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_OURCOMMIT:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_OURCOMMIT_WITH_HTLCS:
case STATE_CLOSE_WAIT_CLOSE_OURCOMMIT:
case STATE_CLOSE_WAIT_STEAL_CLOSE_OURCOMMIT:
case STATE_CLOSE_WAIT_SPENDTHEM_CLOSE_OURCOMMIT:
case STATE_CLOSE_WAIT_SPENDTHEM_CLOSE_OURCOMMIT_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_CLOSE_OURCOMMIT:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_CLOSE_OURCOMMIT_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDOURS:
case STATE_CLOSE_WAIT_STEAL_SPENDOURS_WITH_HTLCS:
case STATE_CLOSE_WAIT_SPENDTHEM_SPENDOURS:
case STATE_CLOSE_WAIT_SPENDTHEM_SPENDOURS_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_SPENDOURS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_SPENDOURS_WITH_HTLCS:
case STATE_CLOSE_WAIT_CLOSE_SPENDOURS:
case STATE_CLOSE_WAIT_STEAL_CLOSE_SPENDOURS:
case STATE_CLOSE_WAIT_SPENDTHEM_CLOSE_SPENDOURS:
case STATE_CLOSE_WAIT_SPENDTHEM_CLOSE_SPENDOURS_WITH_HTLCS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_CLOSE_SPENDOURS:
case STATE_CLOSE_WAIT_STEAL_SPENDTHEM_CLOSE_SPENDOURS_WITH_HTLCS:
case STATE_CLOSE_WAIT_OURCOMMIT:
case STATE_CLOSE_WAIT_OURCOMMIT_WITH_HTLCS:
case STATE_CLOSE_WAIT_SPENDOURS:
case STATE_CLOSE_WAIT_SPENDOURS_WITH_HTLCS: {
unsigned int bits;
enum state_input closed;
bits = STATE_TO_BITS(peer->state);
/* Once we see a steal or spend completely buried, we
* close unless we're still waiting for htlcs*/
if (bits & STATE_CLOSE_HTLCS_BIT)
closed = STATE_CLOSE_WAIT_HTLCS;
else
closed = STATE_CLOSED;
if ((bits & STATE_CLOSE_STEAL_BIT)
&& input_is(input, BITCOIN_STEAL_DONE)) {
/* One a steal is complete, we don't care about htlcs
* (we stole them all) */
if (bits & STATE_CLOSE_HTLCS_BIT)
peer_unwatch_all_htlc_outputs(peer);
return next_state(peer, cstatus, STATE_CLOSED);
}
if ((bits & STATE_CLOSE_SPENDTHEM_BIT)
&& input_is(input, BITCOIN_SPEND_THEIRS_DONE)) {
BUILD_ASSERT(!(STATE_TO_BITS(STATE_CLOSE_WAIT_HTLCS)
& STATE_CLOSE_SPENDTHEM_BIT));
return next_state(peer, cstatus, closed);
}
if ((bits & STATE_CLOSE_CLOSE_BIT)
&& input_is(input, BITCOIN_CLOSE_DONE)) {
BUILD_ASSERT(!(STATE_TO_BITS(STATE_CLOSE_WAIT_HTLCS)
& STATE_CLOSE_CLOSE_BIT));
return next_state(peer, cstatus, closed);
}
if ((bits & STATE_CLOSE_OURCOMMIT_BIT)
&& input_is(input, BITCOIN_ANCHOR_OURCOMMIT_DELAYPASSED)) {
BUILD_ASSERT(!(STATE_TO_BITS(STATE_CLOSE_WAIT_HTLCS)
& STATE_CLOSE_OURCOMMIT_BIT));
tx = bitcoin_spend_ours(peer);
/* Now we need to wait for our commit to be done. */
queue_tx_broadcast(broadcast, tx);
peer_watch_tx(peer, tx, BITCOIN_SPEND_OURS_DONE);
bits &= ~STATE_CLOSE_OURCOMMIT_BIT;
bits |= STATE_CLOSE_SPENDOURS_BIT;
return next_state(peer, cstatus, BITS_TO_STATE(bits));
}
if ((bits & STATE_CLOSE_SPENDOURS_BIT)
&& input_is(input, BITCOIN_SPEND_OURS_DONE)) {
BUILD_ASSERT(!(STATE_TO_BITS(STATE_CLOSE_WAIT_HTLCS)
& STATE_CLOSE_SPENDOURS_BIT));
return next_state(peer, cstatus, closed);
}
/* If we have htlcs, we can get other inputs... */
if (bits & STATE_CLOSE_HTLCS_BIT) {
if (input_is(input, INPUT_NO_MORE_HTLCS)) {
/* Clear bit, might lead to STATE_CLOSED. */
BUILD_ASSERT((BITS_TO_STATE(STATE_TO_BITS(STATE_CLOSE_WAIT_HTLCS) & ~STATE_CLOSE_HTLCS_BIT)) == STATE_CLOSED);
bits &= ~STATE_CLOSE_HTLCS_BIT;
return next_state(peer, cstatus,
BITS_TO_STATE(bits));
} else if (input_is(input, BITCOIN_HTLC_TOTHEM_SPENT)) {
const struct htlc *htlc;
/* They revealed R value. */
htlc = peer_tx_revealed_r_value(peer, idata->btc);
/* We don't care any more. */
peer_unwatch_htlc_output(peer, htlc,
INPUT_NO_MORE_HTLCS);
return unchanged_state(cstatus);
} else if (input_is(input, BITCOIN_HTLC_TOTHEM_TIMEOUT)){
tx = bitcoin_htlc_timeout(peer, idata->htlc);
/* HTLC timed out, spend it back to us. */
queue_tx_broadcast(broadcast, tx);
/* Don't unwatch yet; they could yet
* try to spend, revealing rvalue. */
/* We're done when that gets buried. */
peer_watch_htlc_spend(peer, tx, idata->htlc,
BITCOIN_HTLC_RETURN_SPEND_DONE);
return unchanged_state(cstatus);
} else if (input_is(input, INPUT_RVALUE)) {
tx = bitcoin_htlc_spend(peer,
idata->htlc);
/* Spend it... */
queue_tx_broadcast(broadcast, tx);
/* We're done when it gets buried. */
peer_watch_htlc_spend(peer, tx, idata->htlc,
BITCOIN_HTLC_FULFILL_SPEND_DONE);
/* Don't care about this one any more. */
peer_unwatch_htlc_output(peer, idata->htlc,
INPUT_NO_MORE_HTLCS);
return unchanged_state(cstatus);
} else if (input_is(input, BITCOIN_HTLC_FULFILL_SPEND_DONE)) {
/* Stop watching spend, send
* INPUT_NO_MORE_HTLCS when done. */
peer_unwatch_htlc_spend(peer, idata->htlc,
INPUT_NO_MORE_HTLCS);
return unchanged_state(cstatus);
} else if (input_is(input, BITCOIN_HTLC_RETURN_SPEND_DONE)) {
/* Stop watching spend, send
* INPUT_NO_MORE_HTLCS when done. */
peer_unwatch_htlc_spend(peer, idata->htlc,
INPUT_NO_MORE_HTLCS);
/* Don't need to watch the HTLC output any more,
* either. */
peer_unwatch_htlc_output(peer, idata->htlc,
INPUT_NO_MORE_HTLCS);
return unchanged_state(cstatus);
} else if (input_is(input, BITCOIN_HTLC_TOUS_TIMEOUT)) {
/* They can spend, we no longer care
* about this HTLC. */
peer_unwatch_htlc_output(peer, idata->htlc,
INPUT_NO_MORE_HTLCS);
return unchanged_state(cstatus);
}
}
/* If we're just waiting for HTLCs, anything else is an error */
if (peer->state == STATE_CLOSE_WAIT_HTLCS)
break;
/*
* Now, other side can always spring a commit transaction on us
* (even if they already have, due to tx malleability).
*/
if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
tx = bitcoin_spend_theirs(peer, idata->btc);
queue_tx_broadcast(broadcast, tx);
peer_watch_tx(peer, tx, BITCOIN_SPEND_THEIRS_DONE);
/* HTLC watches: if any, set HTLCs bit. */
if (peer_watch_their_htlc_outputs(peer, idata->btc,
BITCOIN_HTLC_TOUS_TIMEOUT,
BITCOIN_HTLC_TOTHEM_SPENT,
BITCOIN_HTLC_TOTHEM_TIMEOUT))
bits |= STATE_CLOSE_HTLCS_BIT;
bits |= STATE_CLOSE_SPENDTHEM_BIT;
return next_state_bits(peer, cstatus, bits);
/* This can happen multiple times: need to steal ALL */
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
tx = bitcoin_steal(peer, idata->btc);
if (!tx)
return next_state(peer, cstatus,
STATE_ERR_INFORMATION_LEAK);
queue_tx_broadcast(broadcast, tx);
peer_watch_tx(peer, tx, BITCOIN_STEAL_DONE);
bits |= STATE_CLOSE_STEAL_BIT;
return next_state_bits(peer, cstatus, bits);
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT))
goto anchor_unspent;
break;
}
/* Should never happen. */
case STATE_ERR_INTERNAL:
case STATE_ERR_INFORMATION_LEAK:
case STATE_ERR_ANCHOR_TIMEOUT:
case STATE_ERR_ANCHOR_LOST:
case STATE_CLOSED:
case STATE_MAX:
case STATE_UNUSED_CLOSE_WAIT_STEAL_WITH_HTLCS:
case STATE_UNUSED_CLOSE_WAIT_CLOSE_WITH_HTLCS:
case STATE_UNUSED_CLOSE_WAIT_STEAL_CLOSE_WITH_HTLCS:
case STATE_UNUSED_CLOSE_WAIT_CLOSE_OURCOMMIT_WITH_HTLCS:
case STATE_UNUSED_CLOSE_WAIT_STEAL_CLOSE_OURCOMMIT_WITH_HTLCS:
case STATE_UNUSED_CLOSE_WAIT_CLOSE_SPENDOURS_WITH_HTLCS:
case STATE_UNUSED_CLOSE_WAIT_STEAL_CLOSE_SPENDOURS_WITH_HTLCS:
return next_state(peer, cstatus, STATE_ERR_INTERNAL);
}
/* State machine should handle all possible states. */
return next_state(peer, cstatus, STATE_ERR_INTERNAL);
unexpected_pkt:
/*
* We got a weird packet, so we need to close unilaterally.
*/
peer_unexpected_pkt(peer, idata->pkt);
/* Don't reply to an error with an error. */
if (input_is(input, PKT_ERROR)) {
goto start_unilateral_close;
}
err = pkt_err_unexpected(peer, idata->pkt);
goto err_start_unilateral_close;
unexpected_pkt_nocleanup:
/*
* Unexpected packet, but nothing sent to chain yet, so no cleanup.
*/
/* Don't reply to an error with an error. */
if (input_is(input, PKT_ERROR)) {
goto close_nocleanup;
}
err = pkt_err_unexpected(peer, idata->pkt);
goto err_close_nocleanup;
anchor_unspent:
/*
* Bitcoind tells us anchor got double-spent. If we double-spent it
* then we're malfunctioning. If they double-spent it, then they
* managed to cheat us: post_to_reddit();
*/
return next_state(peer, cstatus, STATE_ERR_ANCHOR_LOST);
err_close_nocleanup:
/*
* Something went wrong, but we haven't sent anything to the blockchain
* so there's nothing to clean up.
*/
queue_pkt_err(peer, err);
close_nocleanup:
change_peer_cond(peer, PEER_CMD_OK, PEER_CLOSED);
return next_state(peer, cstatus, STATE_CLOSED);
err_start_unilateral_close:
/*
* They timed out, or were broken; we are going to close unilaterally.
*/
queue_pkt_err(peer, err);
start_unilateral_close:
/*
* Close unilaterally.
*/
/* No more inputs, no more commands. */
set_peer_cond(peer, PEER_CLOSED);
/*
* If they sent us a close tx, that's always cheaper than
* broadcasting our last commit tx, and our funds are not
* timelocked.
*/
if (peer_has_close_sig(peer)) {
queue_tx_broadcast(broadcast, bitcoin_close(peer));
return next_state(peer, cstatus, STATE_CLOSE_WAIT_CLOSE);
}
tx = bitcoin_commit(peer);
queue_tx_broadcast(broadcast, tx);
peer_watch_delayed(peer, tx, BITCOIN_ANCHOR_OURCOMMIT_DELAYPASSED);
/* HTLC watches. */
if (peer_watch_our_htlc_outputs(peer, tx,
BITCOIN_HTLC_TOUS_TIMEOUT,
BITCOIN_HTLC_TOTHEM_SPENT,
BITCOIN_HTLC_TOTHEM_TIMEOUT))
return next_state(peer, cstatus,
STATE_CLOSE_WAIT_OURCOMMIT_WITH_HTLCS);
return next_state(peer, cstatus, STATE_CLOSE_WAIT_OURCOMMIT);
them_unilateral:
assert(input == BITCOIN_ANCHOR_THEIRSPEND);
/*
* Bitcoind tells us they did unilateral close.
*/
queue_pkt_err(peer, pkt_err(peer, "Commit tx noticed"));
/* No more inputs, no more commands. */
set_peer_cond(peer, PEER_CLOSED);
tx = bitcoin_spend_theirs(peer, idata->btc);
queue_tx_broadcast(broadcast, tx);
peer_watch_tx(peer, tx, BITCOIN_SPEND_THEIRS_DONE);
/* HTLC watches (based on what they broadcast, which *may* be out
* of step with our current state by +/- 1 htlc. */
if (peer_watch_their_htlc_outputs(peer, idata->btc,
BITCOIN_HTLC_TOUS_TIMEOUT,
BITCOIN_HTLC_TOTHEM_SPENT,
BITCOIN_HTLC_TOTHEM_TIMEOUT))
return next_state(peer, cstatus,
STATE_CLOSE_WAIT_SPENDTHEM_WITH_HTLCS);
return next_state(peer, cstatus, STATE_CLOSE_WAIT_SPENDTHEM);
start_clearing:
/*
* Start a mutual close: tell them we want to clear.
*/
queue_pkt_close_clearing(peer);
/* No more commands, we're already closing. */
set_peer_cond(peer, PEER_CLOSING);
return next_state(peer, cstatus, STATE_US_CLEARING);
start_closing_cleared:
/* As soon as we send packet, they could close. */
peer_calculate_close_fee(peer);
peer_watch_close(peer, BITCOIN_CLOSE_DONE, INPUT_CLOSE_COMPLETE_TIMEOUT);
queue_pkt_close_signature(peer);
return next_state(peer, cstatus, STATE_WAIT_FOR_CLOSE_SIG);
accept_clearing:
err = accept_pkt_close_clearing(peer, idata->pkt);
if (err)
goto err_start_unilateral_close;
/* Notify us when there are no more htlcs in either commit tx */
peer_watch_htlcs_cleared(peer, INPUT_HTLCS_CLEARED);
/* No more commands, we're already closing. */
set_peer_cond(peer, PEER_CLOSING);
/* Tell them we're clearing too. */
queue_pkt_close_clearing(peer);
return next_state(peer, cstatus, STATE_BOTH_CLEARING);
instant_close:
/*
* Closing, but we haven't sent anything to the blockchain so
* there's nothing to clean up.
*/
/* FIXME: Should we tell other side we're going? */
set_peer_cond(peer, PEER_CLOSED);
/* We can't have any HTLCs, since we haven't started. */
if (committed_to_htlcs(peer))
return next_state(peer, cstatus, STATE_ERR_INTERNAL);
return next_state(peer, cstatus, STATE_CLOSED);
old_commit_spotted:
/*
* bitcoind reported a broadcast of the not-latest commit tx.
*/
queue_pkt_err(peer, pkt_err(peer, "Otherspend noticed"));
/* No more packets, no more commands. */
set_peer_cond(peer, PEER_CLOSED);
/* If we can't find it, we're lost. */
tx = bitcoin_steal(peer, idata->btc);
if (!tx)
return next_state(peer, cstatus,
STATE_ERR_INFORMATION_LEAK);
queue_tx_broadcast(broadcast, tx);
peer_watch_tx(peer, tx, BITCOIN_STEAL_DONE);
return next_state(peer, cstatus, STATE_CLOSE_WAIT_STEAL);
}