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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)
#define add_effect(e, field, val) \
do { \
struct state_effect *_e = tal(ctx, struct state_effect); \
_e->etype = STATE_EFFECT_##field; \
_e->u.field = (val); \
_e->next = (*e); \
(*e) = _e; \
} while(0)
static struct state_effect *next_state(const tal_t *ctx,
struct state_effect *effect,
const enum state state)
{
add_effect(&effect, new_state, state);
return effect;
}
struct state_effect *state(const tal_t *ctx,
const enum state state,
const struct peer *peer,
const enum state_input input,
const union input *idata)
{
struct state_effect *effect = NULL;
Pkt *decline;
struct bitcoin_tx *tx;
Pkt *err;
struct htlc_watch *htlcs;
struct htlc_progress *htlcprog;
switch (state) {
/*
* Initial channel opening states.
*/
case STATE_INIT_NOANCHOR:
assert(input == INPUT_NONE);
add_effect(&effect, send_pkt,
pkt_open(ctx, peer,
OPEN_CHANNEL__ANCHOR_OFFER__WONT_CREATE_ANCHOR));
return next_state(ctx, effect,
STATE_OPEN_WAIT_FOR_OPEN_NOANCHOR);
case STATE_INIT_WITHANCHOR:
assert(input == INPUT_NONE);
add_effect(&effect, send_pkt,
pkt_open(ctx, peer,
OPEN_CHANNEL__ANCHOR_OFFER__WILL_CREATE_ANCHOR));
return next_state(ctx, effect, STATE_OPEN_WAIT_FOR_OPEN_WITHANCHOR);
case STATE_OPEN_WAIT_FOR_OPEN_NOANCHOR:
if (input_is(input, PKT_OPEN)) {
err = accept_pkt_open(ctx, peer, idata->pkt, &effect);
if (err)
goto err_close_nocleanup;
return next_state(ctx, effect, STATE_OPEN_WAIT_FOR_ANCHOR);
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_CLOSE)) {
goto instant_close;
} else if (input_is_pkt(input)) {
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, &effect);
if (err)
goto err_close_nocleanup;
add_effect(&effect, send_pkt, pkt_anchor(ctx, peer));
return next_state(ctx, effect,
STATE_OPEN_WAIT_FOR_COMMIT_SIG);
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_CLOSE)) {
goto instant_close;
} else if (input_is_pkt(input)) {
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, &effect);
if (err)
goto err_close_nocleanup;
add_effect(&effect, send_pkt,
pkt_open_commit_sig(ctx, peer));
add_effect(&effect, watch,
bitcoin_watch_anchor(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT,
BITCOIN_ANCHOR_UNSPENT,
BITCOIN_ANCHOR_THEIRSPEND,
BITCOIN_ANCHOR_OTHERSPEND));
return next_state(ctx, effect,
STATE_OPEN_WAITING_THEIRANCHOR);
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_CLOSE)) {
goto instant_close;
} else if (input_is_pkt(input)) {
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,
&effect);
if (err)
goto err_start_unilateral_close;
add_effect(&effect, broadcast_tx,
bitcoin_anchor(ctx, peer));
add_effect(&effect, watch,
bitcoin_watch_anchor(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE,
BITCOIN_ANCHOR_UNSPENT,
BITCOIN_ANCHOR_THEIRSPEND,
BITCOIN_ANCHOR_OTHERSPEND));
return next_state(ctx, effect, STATE_OPEN_WAITING_OURANCHOR);
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_CLOSE)) {
goto instant_close;
} else if (input_is_pkt(input)) {
goto unexpected_pkt_nocleanup;
}
break;
case STATE_OPEN_WAITING_OURANCHOR:
if (input_is(input, BITCOIN_ANCHOR_DEPTHOK)) {
add_effect(&effect, send_pkt,
pkt_open_complete(ctx, peer));
return next_state(ctx, effect,
STATE_OPEN_WAIT_FOR_COMPLETE_OURANCHOR);
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
goto anchor_unspent;
} else if (input_is(input, PKT_OPEN_COMPLETE)) {
/* Ignore until we've hit depth ourselves. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE));
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
/* This should be impossible. */
return next_state(ctx, effect, STATE_ERR_INFORMATION_LEAK);
} else if (input_is(input, CMD_CLOSE)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE));
goto start_closing;
} else if (input_is(input, PKT_CLOSE)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE));
goto accept_closing;
} else if (input_is_pkt(input)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
INPUT_NONE));
goto unexpected_pkt;
}
break;
case STATE_OPEN_WAITING_THEIRANCHOR:
if (input_is(input, BITCOIN_ANCHOR_TIMEOUT)) {
/* Anchor didn't reach blockchain in reasonable time. */
add_effect(&effect, send_pkt,
pkt_err(ctx, "Anchor timed out"));
return next_state(ctx, effect, STATE_ERR_ANCHOR_TIMEOUT);
} else if (input_is(input, BITCOIN_ANCHOR_DEPTHOK)) {
add_effect(&effect, send_pkt,
pkt_open_complete(ctx, peer));
return next_state(ctx, effect, STATE_OPEN_WAIT_FOR_COMPLETE_THEIRANCHOR);
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
/* This should be impossible. */
return next_state(ctx, effect, STATE_ERR_INFORMATION_LEAK);
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT));
goto them_unilateral;
} else if (input_is(input, PKT_OPEN_COMPLETE)) {
/* Ignore until we've hit depth ourselves. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_CLOSE)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT));
goto start_closing;
} else if (input_is(input, PKT_CLOSE)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT));
goto accept_closing;
} else if (input_is_pkt(input)) {
/* We no longer care about anchor depth. */
add_effect(&effect, unwatch,
bitcoin_unwatch_anchor_depth(ctx, peer,
BITCOIN_ANCHOR_DEPTHOK,
BITCOIN_ANCHOR_TIMEOUT));
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 (state == STATE_OPEN_WAIT_FOR_COMPLETE_OURANCHOR)
return next_state(ctx, effect, STATE_NORMAL_HIGHPRIO);
else
return next_state(ctx, effect, STATE_NORMAL_LOWPRIO);
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
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(ctx, effect, STATE_ERR_INFORMATION_LEAK);
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
goto them_unilateral;
} else if (input_is(input, PKT_OPEN_COMPLETE)) {
/* Ready for business! */
return next_state(ctx, effect, STATE_NORMAL_HIGHPRIO);
} else if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* Can't do this until we're open. */
add_effect(&effect, cmd_defer, input);
/* No state change. */
return effect;
} else if (input_is(input, CMD_CLOSE)) {
goto start_closing;
} else if (input_is(input, PKT_CLOSE)) {
goto accept_closing;
} else if (input_is_pkt(input)) {
goto unexpected_pkt;
}
break;
/*
* Channel normal operating states.
*/
case STATE_NORMAL_LOWPRIO:
case STATE_NORMAL_HIGHPRIO:
if (input_is(input, CMD_SEND_HTLC_UPDATE)) {
/* We are to send an HTLC update. */
add_effect(&effect, send_pkt,
pkt_htlc_update(ctx, peer,
idata->htlc_prog));
add_effect(&effect, htlc_in_progress, idata->htlc_prog);
return next_state(ctx, effect,
prio(state, STATE_WAIT_FOR_HTLC_ACCEPT));
} else if (input_is(input, CMD_SEND_HTLC_FULFILL)) {
/* We are to send an HTLC fulfill. */
/* This gives us the r value (FIXME: type!) */
add_effect(&effect, r_value,
r_value_from_cmd(ctx, peer, idata->htlc));
add_effect(&effect, send_pkt,
pkt_htlc_fulfill(ctx, peer,
idata->htlc_prog));
add_effect(&effect, htlc_in_progress, idata->htlc_prog);
return next_state(ctx, effect,
prio(state, STATE_WAIT_FOR_UPDATE_ACCEPT));
} else if (input_is(input, CMD_SEND_HTLC_TIMEDOUT)) {
/* We are to send an HTLC timedout. */
add_effect(&effect, send_pkt,
pkt_htlc_timedout(ctx, peer,
idata->htlc_prog));
add_effect(&effect, htlc_in_progress, idata->htlc_prog);
return next_state(ctx, effect,
prio(state, STATE_WAIT_FOR_UPDATE_ACCEPT));
} else if (input_is(input, CMD_SEND_HTLC_ROUTEFAIL)) {
/* We are to send an HTLC routefail. */
add_effect(&effect, send_pkt,
pkt_htlc_routefail(ctx, peer,
idata->htlc_prog));
add_effect(&effect, htlc_in_progress, idata->htlc_prog);
return next_state(ctx, effect,
prio(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)) {
goto accept_htlc_update;
} else if (input_is(input, PKT_UPDATE_FULFILL_HTLC)) {
goto accept_htlc_fulfill;
} else if (input_is(input, PKT_UPDATE_TIMEDOUT_HTLC)) {
goto accept_htlc_timedout;
} else if (input_is(input, PKT_UPDATE_ROUTEFAIL_HTLC)) {
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)) {
add_effect(&effect, cmd_fail, idata->pkt);
add_effect(&effect, htlc_abandon, true);
/* No update means no priority change. */
return next_state(ctx, effect,
prio(state, STATE_NORMAL));
/* They can't close with an HTLC, so only possible here */
} else if (input_is(input, PKT_CLOSE)) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
goto accept_closing;
}
/* 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(state))
return effect;
/* Otherwise, process their request first: defer ours */
add_effect(&effect, cmd_requeue, CMD_SEND_UPDATE_ANY);
add_effect(&effect, htlc_abandon, true);
goto accept_htlc_update;
} else if (input_is(input, PKT_UPDATE_FULFILL_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(state))
return effect;
/* Otherwise, process their request first: defer ours */
add_effect(&effect, cmd_requeue, CMD_SEND_UPDATE_ANY);
add_effect(&effect, htlc_abandon, true);
goto accept_htlc_fulfill;
} else if (input_is(input, PKT_UPDATE_TIMEDOUT_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(state))
return effect;
/* Otherwise, process their request first: defer ours */
add_effect(&effect, cmd_requeue, CMD_SEND_UPDATE_ANY);
add_effect(&effect, htlc_abandon, true);
goto accept_htlc_timedout;
} else if (input_is(input, PKT_UPDATE_ROUTEFAIL_HTLC)) {
/* If we're high priority, ignore their packet */
if (high_priority(state))
return effect;
/* Otherwise, process their request first: defer ours */
add_effect(&effect, cmd_requeue, CMD_SEND_UPDATE_ANY);
add_effect(&effect, htlc_abandon, true);
goto accept_htlc_routefail;
} else if (input_is(input, PKT_UPDATE_ACCEPT)) {
struct signature *sig;
err = accept_pkt_update_accept(ctx, peer, idata->pkt,
&sig, &effect);
if (err) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
goto err_start_unilateral_close;
}
add_effect(&effect, update_theirsig, sig);
add_effect(&effect, send_pkt,
pkt_update_signature(ctx, peer));
/* HTLC is signed (though old tx not revoked yet!) */
add_effect(&effect, htlc_fulfill, true);
return next_state(ctx, effect,
prio(state, STATE_WAIT_FOR_UPDATE_COMPLETE));
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
goto old_commit_spotted;
} else if (input_is(input, CMD_CLOSE)) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
goto start_closing;
} else if (input_is_pkt(input)) {
add_effect(&effect, cmd_fail, NULL);
add_effect(&effect, htlc_abandon, true);
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,
&effect);
if (err) {
add_effect(&effect, cmd_fail, NULL);
goto err_start_unilateral_close;
}
add_effect(&effect, cmd_success, CMD_SEND_UPDATE_ANY);
return next_state(ctx, effect,
toggle_prio(state, STATE_NORMAL));
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
add_effect(&effect, cmd_fail, NULL);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
add_effect(&effect, cmd_fail, NULL);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
add_effect(&effect, cmd_fail, NULL);
goto old_commit_spotted;
} else if (input_is(input, PKT_CLOSE)) {
add_effect(&effect, cmd_fail, NULL);
goto accept_closing;
} else if (input_is(input, CMD_CLOSE)) {
add_effect(&effect, cmd_fail, NULL);
goto start_closing;
} else if (input_is_pkt(input)) {
add_effect(&effect, cmd_fail, NULL);
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)) {
struct signature *sig;
err = accept_pkt_update_signature(ctx, peer, idata->pkt,
&sig, &effect);
if (err) {
add_effect(&effect, htlc_abandon, true);
goto err_start_unilateral_close;
}
add_effect(&effect, update_theirsig, sig);
add_effect(&effect, send_pkt,
pkt_update_complete(ctx, peer));
add_effect(&effect, htlc_fulfill, true);
/* Toggle between high and low priority states. */
return next_state(ctx, effect,
toggle_prio(state, STATE_NORMAL));
} else if (input_is(input, CMD_SEND_UPDATE_ANY)) {
add_effect(&effect, cmd_defer, input);
return effect;
} else if (input_is(input, BITCOIN_ANCHOR_UNSPENT)) {
add_effect(&effect, htlc_abandon, true);
goto anchor_unspent;
} else if (input_is(input, BITCOIN_ANCHOR_THEIRSPEND)) {
add_effect(&effect, htlc_abandon, true);
goto them_unilateral;
} else if (input_is(input, BITCOIN_ANCHOR_OTHERSPEND)) {
add_effect(&effect, htlc_abandon, true);
goto old_commit_spotted;
} else if (input_is(input, CMD_CLOSE)) {
add_effect(&effect, htlc_abandon, true);
goto start_closing;
} else if (input_is(input, PKT_CLOSE)) {
add_effect(&effect, htlc_abandon, true);
goto accept_closing;
} else if (input_is_pkt(input)) {
add_effect(&effect, htlc_abandon, true);
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,
&effect);
if (err)
goto err_start_unilateral_close_already_closing;
add_effect(&effect, cmd_close_done, true);
add_effect(&effect, send_pkt,
pkt_close_ack(ctx, peer));
add_effect(&effect, broadcast_tx,
bitcoin_close(ctx, peer));
add_effect(&effect, stop_commands, true);
add_effect(&effect, stop_packets, true);
return next_state(ctx, effect, 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,
&effect);
if (err)
goto err_start_unilateral_close_already_closing;
add_effect(&effect, cmd_close_done, true);
add_effect(&effect, send_pkt,
pkt_close_ack(ctx, peer));
add_effect(&effect, broadcast_tx,
bitcoin_close(ctx, peer));
add_effect(&effect, stop_commands, true);
add_effect(&effect, stop_packets, true);
return next_state(ctx, effect, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is(input, PKT_ERROR)) {
add_effect(&effect, in_error,
tal_steal(ctx, idata->pkt));
goto start_unilateral_close_already_closing;
} else if (input_is_pkt(input)) {
/* We ignore all other packets while closing. */
return next_state(ctx, effect, STATE_WAIT_FOR_CLOSE_COMPLETE);
} 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;
}
add_effect(&effect, cmd_close_done, false);
add_effect(&effect, stop_commands, true);
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,
&effect);
if (err)
add_effect(&effect, send_pkt, err);
add_effect(&effect, stop_packets, true);
/* Just wait for close to happen now. */
return next_state(ctx, effect, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is_pkt(input)) {
if (input_is(input, PKT_ERROR)) {
add_effect(&effect, in_error,
tal_steal(ctx, idata->pkt));
} else {
add_effect(&effect, send_pkt,
unexpected_pkt(ctx, input));
}
add_effect(&effect, stop_packets, true);
/* Just wait for close to happen now. */
return next_state(ctx, effect, STATE_CLOSE_WAIT_CLOSE);
} else if (input_is(input, BITCOIN_CLOSE_DONE)) {
/* They didn't ack, but we're closed, so stop. */
add_effect(&effect, stop_packets, true);
return next_state(ctx, effect, 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, base;
enum state_input closed;
base = (unsigned)STATE_CLOSED;
bits = (unsigned)state - base;
/* 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)
add_effect(&effect, unwatch_htlc,
htlc_unwatch_all(ctx, peer));
return next_state(ctx, effect, STATE_CLOSED);
}
if ((bits & STATE_CLOSE_SPENDTHEM_BIT)
&& input_is(input, BITCOIN_SPEND_THEIRS_DONE)) {
BUILD_ASSERT(!((STATE_CLOSE_WAIT_HTLCS - base)
& STATE_CLOSE_SPENDTHEM_BIT));
return next_state(ctx, effect, closed);
}
if ((bits & STATE_CLOSE_CLOSE_BIT)
&& input_is(input, BITCOIN_CLOSE_DONE)) {
BUILD_ASSERT(!((STATE_CLOSE_WAIT_HTLCS - base)
& STATE_CLOSE_CLOSE_BIT));
return next_state(ctx, effect, closed);
}
if ((bits & STATE_CLOSE_OURCOMMIT_BIT)
&& input_is(input, BITCOIN_ANCHOR_OURCOMMIT_DELAYPASSED)) {
BUILD_ASSERT(!((STATE_CLOSE_WAIT_HTLCS - base)
& STATE_CLOSE_OURCOMMIT_BIT));
tx = bitcoin_spend_ours(ctx, peer);
/* Now we need to wait for our commit to be done. */
add_effect(&effect, broadcast_tx, tx);
add_effect(&effect, watch,
bitcoin_watch(ctx, tx,
BITCOIN_SPEND_OURS_DONE));
bits &= ~STATE_CLOSE_OURCOMMIT_BIT;
bits |= STATE_CLOSE_SPENDOURS_BIT;
return next_state(ctx, effect, base + bits);
}
if ((bits & STATE_CLOSE_SPENDOURS_BIT)
&& input_is(input, BITCOIN_SPEND_OURS_DONE)) {
BUILD_ASSERT(!((STATE_CLOSE_WAIT_HTLCS - base)
& STATE_CLOSE_SPENDOURS_BIT));
return next_state(ctx, effect, 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(((STATE_CLOSE_WAIT_HTLCS - base)
& ~STATE_CLOSE_HTLCS_BIT)
== STATE_CLOSED);
bits &= ~STATE_CLOSE_HTLCS_BIT;
return next_state(ctx, effect, base + bits);
} else if (input_is(input, BITCOIN_HTLC_TOTHEM_SPENT)) {
/* They revealed R value. */
add_effect(&effect, r_value,
bitcoin_r_value(ctx, idata->htlc));
/* We don't care any more. */
add_effect(&effect, unwatch_htlc,
htlc_unwatch(ctx, idata->htlc,
INPUT_NO_MORE_HTLCS));
return effect;
} 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. */
add_effect(&effect, broadcast_tx, tx);
/* Don't unwatch yet; they could yet
* try to spend, revealing rvalue. */
/* We're done when that gets buried. */
add_effect(&effect, watch_htlc_spend,
htlc_spend_watch(ctx,
tx,
idata->cmd,
BITCOIN_HTLC_RETURN_SPEND_DONE));
return effect;
} else if (input_is(input, INPUT_RVALUE)) {
tx = bitcoin_htlc_spend(ctx, peer,
idata->htlc);
/* This gives us the r value. */
add_effect(&effect, r_value,
r_value_from_cmd(ctx, peer,
idata->htlc));
/* Spend it... */
add_effect(&effect, broadcast_tx, tx);
/* We're done when it gets buried. */
add_effect(&effect, watch_htlc_spend,
htlc_spend_watch(ctx,
tx,
idata->cmd,
BITCOIN_HTLC_FULFILL_SPEND_DONE));
/* Don't care about this one any more. */
add_effect(&effect, unwatch_htlc,
htlc_unwatch(ctx, idata->htlc,
INPUT_NO_MORE_HTLCS));
return effect;
} else if (input_is(input, BITCOIN_HTLC_FULFILL_SPEND_DONE)) {
/* Stop watching spend, send
* INPUT_NO_MORE_HTLCS when done. */
add_effect(&effect, unwatch_htlc_spend,
htlc_spend_unwatch(ctx,
idata->htlc,
INPUT_NO_MORE_HTLCS));
return effect;
} else if (input_is(input, BITCOIN_HTLC_RETURN_SPEND_DONE)) {
/* Stop watching spend, send
* INPUT_NO_MORE_HTLCS when done. */
add_effect(&effect, unwatch_htlc_spend,
htlc_spend_unwatch(ctx,
idata->htlc,
INPUT_NO_MORE_HTLCS));
/* Don't need to watch the HTLC output any more,
* either. */
add_effect(&effect, unwatch_htlc,
htlc_unwatch(ctx, idata->htlc,
INPUT_NO_MORE_HTLCS));
return effect;
} else if (input_is(input, BITCOIN_HTLC_TOUS_TIMEOUT)) {
/* They can spend, we no longer care
* about this HTLC. */
add_effect(&effect, unwatch_htlc,
htlc_unwatch(ctx, idata->htlc,
INPUT_NO_MORE_HTLCS));
return effect;
}
}
/* If we're just waiting for HTLCs, anything else is an error */
if (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);
add_effect(&effect, broadcast_tx, tx);
add_effect(&effect, watch,
bitcoin_watch(ctx, tx,
BITCOIN_SPEND_THEIRS_DONE));
/* HTLC watches. */
htlcs = htlc_outputs_their_commit(ctx, peer,
idata->btc,
BITCOIN_HTLC_TOUS_TIMEOUT,
BITCOIN_HTLC_TOTHEM_SPENT,
BITCOIN_HTLC_TOTHEM_TIMEOUT);
if (htlcs) {
add_effect(&effect, watch_htlcs, htlcs);
bits |= STATE_CLOSE_HTLCS_BIT;
}
bits |= STATE_CLOSE_SPENDTHEM_BIT;
return next_state(ctx, effect, base + 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(ctx, effect,
STATE_ERR_INFORMATION_LEAK);
add_effect(&effect, broadcast_tx, tx);
add_effect(&effect, watch,
bitcoin_watch(ctx, tx,
BITCOIN_STEAL_DONE));
bits |= STATE_CLOSE_STEAL_BIT;
return next_state(ctx, effect, base + 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(ctx, effect, STATE_ERR_INTERNAL);
}
/* State machine should handle all possible states. */
return next_state(ctx, effect, STATE_ERR_INTERNAL);
unexpected_pkt:
/*
* We got a weird packet, so we need to close unilaterally.
*/
/* Don't reply to an error with an error. */
if (input_is(input, PKT_ERROR)) {
add_effect(&effect, in_error, tal_steal(ctx, idata->pkt));
goto start_unilateral_close;
}
err = unexpected_pkt(ctx, input);
goto err_start_unilateral_close;
unexpected_pkt_nocleanup:
/*
* Unexpected packet, but nothing sent to chain yet, so no cleanup.
*/
err = unexpected_pkt(ctx, input);
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(ctx, effect, 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.
*/
add_effect(&effect, send_pkt, err);
add_effect(&effect, stop_packets, true);
add_effect(&effect, stop_commands, true);
return next_state(ctx, effect, STATE_CLOSED);
err_start_unilateral_close:
/*
* They timed out, or were broken; we are going to close unilaterally.
*/
add_effect(&effect, send_pkt, err);
start_unilateral_close:
/*
* Close unilaterally.
*/
/* No more inputs, no more commands. */
add_effect(&effect, stop_packets, true);
add_effect(&effect, stop_commands, true);
tx = bitcoin_commit(ctx, peer);
add_effect(&effect, broadcast_tx, tx);
add_effect(&effect, watch,
bitcoin_watch_delayed(ctx, tx,
BITCOIN_ANCHOR_OURCOMMIT_DELAYPASSED));
/* HTLC watches. */
htlcs = htlc_outputs_our_commit(ctx, peer, tx,
BITCOIN_HTLC_TOUS_TIMEOUT,
BITCOIN_HTLC_TOTHEM_SPENT,
BITCOIN_HTLC_TOTHEM_TIMEOUT);
if (htlcs) {
add_effect(&effect, watch_htlcs, htlcs);
return next_state(ctx, effect,
STATE_CLOSE_WAIT_OURCOMMIT_WITH_HTLCS);
}
return next_state(ctx, effect, STATE_CLOSE_WAIT_OURCOMMIT);
err_start_unilateral_close_already_closing:
/*
* They timed out, or were broken; we are going to close unilaterally.
*/
add_effect(&effect, send_pkt, err);
start_unilateral_close_already_closing:
add_effect(&effect, cmd_close_done, false);
/*
* Close unilaterally.
*/
/* No more inputs, no more commands. */
add_effect(&effect, stop_packets, true);
add_effect(&effect, stop_commands, true);
tx = bitcoin_commit(ctx, peer);
add_effect(&effect, broadcast_tx, tx);
add_effect(&effect, watch,
bitcoin_watch_delayed(ctx, tx,
BITCOIN_ANCHOR_OURCOMMIT_DELAYPASSED));
/* We agreed to close: shouldn't have any HTLCs */
if (committed_to_htlcs(peer))
return next_state(ctx, effect, STATE_ERR_INTERNAL);
return next_state(ctx, effect, STATE_CLOSE_WAIT_CLOSE_OURCOMMIT);
them_unilateral:
assert(input == BITCOIN_ANCHOR_THEIRSPEND);
/*
* Bitcoind tells us they did unilateral close.
*/
add_effect(&effect, send_pkt, pkt_err(ctx, "Commit tx noticed"));
/* No more inputs, no more commands. */
add_effect(&effect, stop_packets, true);
add_effect(&effect, stop_commands, true);
tx = bitcoin_spend_theirs(ctx, peer, idata->btc);
add_effect(&effect, broadcast_tx, tx);
add_effect(&effect, watch,
bitcoin_watch(ctx, 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. */
htlcs = htlc_outputs_their_commit(ctx, peer, idata->btc,
BITCOIN_HTLC_TOUS_TIMEOUT,
BITCOIN_HTLC_TOTHEM_SPENT,
BITCOIN_HTLC_TOTHEM_TIMEOUT);
if (htlcs) {
add_effect(&effect, watch_htlcs, htlcs);
return next_state(ctx, effect, STATE_CLOSE_WAIT_SPENDTHEM_WITH_HTLCS);
}
return next_state(ctx, effect, STATE_CLOSE_WAIT_SPENDTHEM);
accept_htlc_update:
err = accept_pkt_htlc_update(ctx, peer, idata->pkt, &decline, &htlcprog,
&effect);
if (err)
goto err_start_unilateral_close;
if (decline) {
add_effect(&effect, send_pkt, decline);
/* No update means no priority change. */
return next_state(ctx, effect, prio(state, STATE_NORMAL));
}
add_effect(&effect, htlc_in_progress, htlcprog);
add_effect(&effect, send_pkt, pkt_update_accept(ctx, peer));
return next_state(ctx, effect, prio(state, STATE_WAIT_FOR_UPDATE_SIG));
accept_htlc_routefail:
err = accept_pkt_htlc_routefail(ctx, peer, idata->pkt, &htlcprog,
&effect);
if (err)
goto err_start_unilateral_close;
add_effect(&effect, htlc_in_progress, htlcprog);
add_effect(&effect, send_pkt, pkt_update_accept(ctx, peer));
return next_state(ctx, effect, prio(state, STATE_WAIT_FOR_UPDATE_SIG));
accept_htlc_timedout:
err = accept_pkt_htlc_timedout(ctx, peer, idata->pkt, &htlcprog,
&effect);
if (err)
goto err_start_unilateral_close;
add_effect(&effect, htlc_in_progress, htlcprog);
add_effect(&effect, send_pkt, pkt_update_accept(ctx, peer));
return next_state(ctx, effect, prio(state, STATE_WAIT_FOR_UPDATE_SIG));
accept_htlc_fulfill:
err = accept_pkt_htlc_fulfill(ctx, peer, idata->pkt, &htlcprog,
&effect);