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state.c
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state.c
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#include <ccan/build_assert/build_assert.h>
#include <state.h>
static inline bool high_priority(enum state state)
{
return (state & 1) == (STATE_NORMAL_HIGHPRIO & 1);
}
#define prio(state, name) \
(high_priority(state) ? name##_HIGHPRIO : name##_LOWPRIO)
#define toggle_prio(state, name) \
(!high_priority(state) ? name##_HIGHPRIO : name##_LOWPRIO)
/* 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 two 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.
*/
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;
}
static void queue_pkt(Pkt **out, Pkt *pkt)
{
assert(!*out);
assert(pkt);
*out = pkt;
}
static void queue_tx_broadcast(struct bitcoin_tx **broadcast,
struct bitcoin_tx *tx)
{
assert(!*broadcast);
assert(tx);
*broadcast = tx;
}
enum command_status state(const tal_t *ctx,
struct peer *peer,
const enum state_input input,
const union input *idata,
Pkt **out,
struct bitcoin_tx **broadcast)
{
Pkt *decline;
struct bitcoin_tx *tx;
Pkt *err;
enum command_status cstatus = CMD_NONE;
*out = NULL;
*broadcast = NULL;
switch (peer->state) {
/*
* Initial channel opening states.
*/
case STATE_INIT:
if (input_is(input, CMD_OPEN_WITH_ANCHOR)) {
queue_pkt(out,
pkt_open(ctx, 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(out,
pkt_open(ctx, 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(ctx, 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)) {
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(ctx, peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_close_nocleanup;
}
queue_pkt(out, pkt_anchor(ctx, peer));
return next_state(peer, cstatus,
STATE_OPEN_WAIT_FOR_COMMIT_SIG);
} else if (input_is(input, CMD_CLOSE)) {
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:
if (input_is(input, PKT_OPEN_ANCHOR)) {
err = accept_pkt_anchor(ctx, peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_close_nocleanup;
}
queue_pkt(out,
pkt_open_commit_sig(ctx, 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)) {
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(ctx, peer, idata->pkt);
if (err) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_start_unilateral_close;
}
queue_tx_broadcast(broadcast, bitcoin_anchor(ctx, 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)) {
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_WAITING_OURANCHOR:
if (input_is(input, PKT_OPEN_COMPLETE)) {
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(out,
pkt_open_complete(ctx, peer));
if (peer->state == STATE_OPEN_WAITING_OURANCHOR_THEYCOMPLETED) {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus,
STATE_NORMAL_HIGHPRIO);
}
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_closing;
} else if (input_is(input, PKT_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 accept_closing;
} 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_nocleanup;
}
break;
case STATE_OPEN_WAITING_THEIRANCHOR:
if (input_is(input, PKT_OPEN_COMPLETE)) {
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(out,
pkt_err(ctx, "Anchor timed out"));
return next_state(peer, cstatus, STATE_ERR_ANCHOR_TIMEOUT);
} else if (input_is(input, BITCOIN_ANCHOR_DEPTHOK)) {
queue_pkt(out,
pkt_open_complete(ctx, peer));
if (peer->state == STATE_OPEN_WAITING_THEIRANCHOR_THEYCOMPLETED) {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus,
STATE_NORMAL_LOWPRIO);
}
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_closing;
} else if (input_is(input, PKT_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 accept_closing;
} 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_HIGHPRIO);
} else {
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus,
STATE_NORMAL_LOWPRIO);
}
} 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_closing;
} else if (input_is(input, PKT_CLOSE)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto accept_closing;
} else if (input_is_pkt(input)) {
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt;
}
break;
/*
* Channel normal operating states.
*/
case STATE_NORMAL_LOWPRIO:
case STATE_NORMAL_HIGHPRIO:
assert(peer->cond == PEER_CMD_OK);
if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* We are to send an HTLC update. */
queue_pkt(out,
pkt_htlc_update(ctx, peer,
idata->htlc_prog));
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
return next_state(peer, cstatus,
prio(peer->state, STATE_WAIT_FOR_HTLC_ACCEPT));
} else if (input_is(input, CMD_SEND_HTLC_FULFILL)) {
/* We are to send an HTLC fulfill. */
queue_pkt(out,
pkt_htlc_fulfill(ctx, peer,
idata->htlc_prog));
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
return next_state(peer, cstatus,
prio(peer->state, STATE_WAIT_FOR_UPDATE_ACCEPT));
} else if (input_is(input, CMD_SEND_HTLC_TIMEDOUT)) {
/* We are to send an HTLC timedout. */
queue_pkt(out,
pkt_htlc_timedout(ctx, peer,
idata->htlc_prog));
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
return next_state(peer, cstatus,
prio(peer->state, STATE_WAIT_FOR_UPDATE_ACCEPT));
} else if (input_is(input, CMD_SEND_HTLC_ROUTEFAIL)) {
/* We are to send an HTLC routefail. */
queue_pkt(out,
pkt_htlc_routefail(ctx, peer,
idata->htlc_prog));
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
return next_state(peer, cstatus,
prio(peer->state, STATE_WAIT_FOR_UPDATE_ACCEPT));
} else if (input_is(input, CMD_CLOSE)) {
goto start_closing;
} else if (input_is(input, PKT_UPDATE_ADD_HTLC)) {
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_update;
} else if (input_is(input, PKT_UPDATE_FULFILL_HTLC)) {
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_fulfill;
} else if (input_is(input, PKT_UPDATE_TIMEDOUT_HTLC)) {
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_timedout;
} else if (input_is(input, PKT_UPDATE_ROUTEFAIL_HTLC)) {
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_routefail;
} 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, PKT_CLOSE)) {
goto accept_closing;
} else if (input_is_pkt(input)) {
goto unexpected_pkt;
}
break;
case STATE_WAIT_FOR_HTLC_ACCEPT_LOWPRIO:
case STATE_WAIT_FOR_HTLC_ACCEPT_HIGHPRIO:
/* HTLCs can also evoke a refusal. */
if (input_is(input, PKT_UPDATE_DECLINE_HTLC)) {
peer_htlc_declined(peer, idata->pkt);
complete_cmd(peer, &cstatus, CMD_FAIL);
/* No update means no priority change. */
return next_state(peer, cstatus,
prio(peer->state, STATE_NORMAL));
}
/* Fall thru */
case STATE_WAIT_FOR_UPDATE_ACCEPT_LOWPRIO:
case STATE_WAIT_FOR_UPDATE_ACCEPT_HIGHPRIO:
if (input_is(input, PKT_UPDATE_ADD_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(peer->state))
return cstatus;
/* Otherwise, process their request first: defer ours */
peer_htlc_ours_deferred(peer);
complete_cmd(peer, &cstatus, CMD_REQUEUE);
/* Stay busy, since we're processing theirs. */
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_update;
} else if (input_is(input, PKT_UPDATE_FULFILL_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(peer->state))
return cstatus;
/* Otherwise, process their request first: defer ours */
peer_htlc_ours_deferred(peer);
complete_cmd(peer, &cstatus, CMD_REQUEUE);
/* Stay busy, since we're processing theirs. */
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_fulfill;
} else if (input_is(input, PKT_UPDATE_TIMEDOUT_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(peer->state))
return cstatus;
/* Otherwise, process their request first: defer ours */
peer_htlc_ours_deferred(peer);
complete_cmd(peer, &cstatus, CMD_REQUEUE);
/* Stay busy, since we're processing theirs. */
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_timedout;
} else if (input_is(input, PKT_UPDATE_ROUTEFAIL_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(peer->state))
return cstatus;
/* Otherwise, process their request first: defer ours */
peer_htlc_ours_deferred(peer);
complete_cmd(peer, &cstatus, CMD_REQUEUE);
/* Stay busy, since we're processing theirs. */
change_peer_cond(peer, PEER_CMD_OK, PEER_BUSY);
goto accept_htlc_routefail;
} else if (input_is(input, PKT_UPDATE_ACCEPT)) {
err = accept_pkt_update_accept(ctx, peer, idata->pkt);
if (err) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_start_unilateral_close;
}
queue_pkt(out,
pkt_update_signature(ctx, peer));
/* HTLC is signed (though old tx not revoked yet!) */
return next_state(peer, cstatus,
prio(peer->state, STATE_WAIT_FOR_UPDATE_COMPLETE));
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto old_commit_spotted;
} else if (input_is(input, CMD_CLOSE)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_closing;
} else if (input_is(input, PKT_CLOSE)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto accept_closing;
} else if (input_is_pkt(input)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt;
}
break;
case STATE_WAIT_FOR_UPDATE_COMPLETE_LOWPRIO:
case STATE_WAIT_FOR_UPDATE_COMPLETE_HIGHPRIO:
if (input_is(input, PKT_UPDATE_COMPLETE)) {
err = accept_pkt_update_complete(ctx, peer, idata->pkt);
if (err) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto err_start_unilateral_close;
}
peer_htlc_done(peer);
complete_cmd(peer, &cstatus, CMD_SUCCESS);
return next_state(peer, cstatus,
toggle_prio(peer->state, STATE_NORMAL));
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto old_commit_spotted;
} else if (input_is(input, PKT_CLOSE)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto accept_closing;
} else if (input_is(input, CMD_CLOSE)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto start_closing;
} else if (input_is_pkt(input)) {
peer_htlc_aborted(peer);
complete_cmd(peer, &cstatus, CMD_FAIL);
goto unexpected_pkt;
}
break;
case STATE_WAIT_FOR_UPDATE_SIG_LOWPRIO:
case STATE_WAIT_FOR_UPDATE_SIG_HIGHPRIO:
if (input_is(input, PKT_UPDATE_SIGNATURE)) {
err = accept_pkt_update_signature(ctx, peer, idata->pkt);
if (err) {
peer_htlc_aborted(peer);
goto err_start_unilateral_close;
}
queue_pkt(out,
pkt_update_complete(ctx, peer));
peer_htlc_done(peer);
change_peer_cond(peer, PEER_BUSY, PEER_CMD_OK);
/* Toggle between high and low priority states. */
return next_state(peer, cstatus,
toggle_prio(peer->state, STATE_NORMAL));
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
peer_htlc_aborted(peer);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
peer_htlc_aborted(peer);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
peer_htlc_aborted(peer);
goto old_commit_spotted;
} else if (input_is(input, CMD_CLOSE)) {
peer_htlc_aborted(peer);
goto start_closing;
} else if (input_is(input, PKT_CLOSE)) {
peer_htlc_aborted(peer);
goto accept_closing;
} else if (input_is_pkt(input)) {
peer_htlc_aborted(peer);
goto unexpected_pkt;
}
break;
case STATE_WAIT_FOR_CLOSE_COMPLETE:
if (input_is(input, PKT_CLOSE_COMPLETE)) {
err = accept_pkt_close_complete(ctx, peer, idata->pkt);
if (err)
goto err_start_unilateral_close_already_closing;
queue_pkt(out,
pkt_close_ack(ctx, peer));
queue_tx_broadcast(broadcast, bitcoin_close(ctx, peer));
change_peer_cond(peer, PEER_CLOSING, PEER_CLOSED);
return next_state(peer, cstatus, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is(input, PKT_CLOSE)) {
/* We can use the sig just like CLOSE_COMPLETE */
err = accept_pkt_simultaneous_close(ctx, peer,
idata->pkt);
if (err)
goto err_start_unilateral_close_already_closing;
queue_pkt(out,
pkt_close_ack(ctx, peer));
queue_tx_broadcast(broadcast, bitcoin_close(ctx, peer));
set_peer_cond(peer, PEER_CLOSED);
return next_state(peer, cstatus, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is(input, PKT_ERROR)) {
peer_unexpected_pkt(peer, idata->pkt);
goto start_unilateral_close_already_closing;
} else if (input_is_pkt(input)) {
/* We ignore all other packets while closing. */
return unchanged_state(cstatus);
} else if (input_is(input, INPUT_CLOSE_COMPLETE_TIMEOUT)) {
/* They didn't respond in time. Unilateral close. */
err = pkt_err(ctx, "Close timed out");
goto err_start_unilateral_close_already_closing;
}
goto fail_during_close;
case STATE_WAIT_FOR_CLOSE_ACK:
if (input_is(input, PKT_CLOSE_ACK)) {
err = accept_pkt_close_ack(ctx, peer, idata->pkt);
if (err)
queue_pkt(out, err);
set_peer_cond(peer, PEER_CLOSED);
/* Just wait for close to happen now. */
return next_state(peer, cstatus, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is_pkt(input)) {
peer_unexpected_pkt(peer, idata->pkt);
/* Don't reply to an error with an error. */
if (!input_is(input, PKT_ERROR)) {
queue_pkt(out,
pkt_err_unexpected(ctx, idata->pkt));
}
set_peer_cond(peer, PEER_CLOSED);
/* Just wait for close to happen now. */
return next_state(peer, cstatus, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is(input, BITCOIN_CLOSE_DONE)) {
/* They didn't ack, but we're closed, so stop. */
set_peer_cond(peer, PEER_CLOSED);
return next_state(peer, cstatus, STATE_CLOSED);
}
goto fail_during_close;
/* 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(ctx, 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(ctx,
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(ctx, 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(ctx, 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(ctx, 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(ctx, 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(ctx, 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(out, 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(out, err);
start_unilateral_close:
/*
* Close unilaterally.
*/
/* No more inputs, no more commands. */
set_peer_cond(peer, PEER_CLOSED);
tx = bitcoin_commit(ctx, 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);
err_start_unilateral_close_already_closing:
/*
* They timed out, or were broken; we are going to close unilaterally.
*/
queue_pkt(out, err);
start_unilateral_close_already_closing:
/*
* Close unilaterally.
*/
/* No more inputs, no more commands. */
set_peer_cond(peer, PEER_CLOSED);
tx = bitcoin_commit(ctx, peer);
queue_tx_broadcast(broadcast, tx);
peer_watch_delayed(peer, tx, BITCOIN_ANCHOR_OURCOMMIT_DELAYPASSED);
/* We agreed to close: shouldn't have any HTLCs */
if (committed_to_htlcs(peer))
return next_state(peer, cstatus, STATE_ERR_INTERNAL);
return next_state(peer, cstatus, STATE_CLOSE_WAIT_CLOSE_OURCOMMIT);
them_unilateral:
assert(input == BITCOIN_ANCHOR_THEIRSPEND);
/*
* Bitcoind tells us they did unilateral close.
*/
queue_pkt(out, pkt_err(ctx, "Commit tx noticed"));
/* No more inputs, no more commands. */
set_peer_cond(peer, PEER_CLOSED);
tx = bitcoin_spend_theirs(ctx, 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);
accept_htlc_update:
err = accept_pkt_htlc_update(ctx, peer, idata->pkt, &decline);
if (err)
goto err_start_unilateral_close;
if (decline) {
queue_pkt(out, decline);
peer_htlc_declined(peer, decline);
/* No update means no priority change. */
change_peer_cond(peer, PEER_BUSY, PEER_CMD_OK);