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lightning/daemon/peer.c

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#include "bitcoind.h"
#include "chaintopology.h"
#include "close_tx.h"
#include "commit_tx.h"
#include "cryptopkt.h"
#include "db.h"
#include "dns.h"
#include "find_p2sh_out.h"
#include "invoice.h"
#include "jsonrpc.h"
#include "lightningd.h"
#include "log.h"
#include "names.h"
#include "netaddr.h"
#include "output_to_htlc.h"
#include "p2p_announce.h"
#include "packets.h"
#include "pay.h"
#include "peer.h"
#include "peer_internal.h"
#include "permute_tx.h"
#include "protobuf_convert.h"
#include "pseudorand.h"
#include "remove_dust.h"
#include "routing.h"
#include "secrets.h"
#include "sphinx.h"
#include "state.h"
#include "timeout.h"
#include "utils.h"
#include "wallet.h"
#include <bitcoin/base58.h>
#include <bitcoin/script.h>
#include <bitcoin/tx.h>
#include <ccan/array_size/array_size.h>
#include <ccan/cast/cast.h>
#include <ccan/io/io.h>
#include <ccan/list/list.h>
#include <ccan/mem/mem.h>
#include <ccan/noerr/noerr.h>
#include <ccan/ptrint/ptrint.h>
#include <ccan/str/hex/hex.h>
#include <ccan/structeq/structeq.h>
#include <ccan/tal/str/str.h>
#include <ccan/tal/tal.h>
#include <errno.h>
#include <inttypes.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sodium/randombytes.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
struct json_connecting {
/* This owns us, so we're freed after command_fail or command_success */
struct command *cmd;
const char *name, *port;
struct anchor_input *input;
};
static bool command_htlc_set_fail(struct peer *peer, struct htlc *htlc,
enum fail_error error_code, const char *why);
static bool command_htlc_fail(struct peer *peer, struct htlc *htlc);
static bool command_htlc_fulfill(struct peer *peer, struct htlc *htlc);
static void try_commit(struct peer *peer);
void peer_debug(struct peer *peer, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
logv(peer->log, LOG_DBG, fmt, ap);
va_end(ap);
}
void peer_add_their_commit(struct peer *peer,
const struct sha256_double *txid, u64 commit_num)
{
struct their_commit *tc = tal(peer, struct their_commit);
tc->txid = *txid;
tc->commit_num = commit_num;
list_add_tail(&peer->their_commits, &tc->list);
db_add_commit_map(peer, txid, commit_num);
}
/* Create a bitcoin close tx, using last signature they sent. */
static const struct bitcoin_tx *mk_bitcoin_close(const tal_t *ctx,
struct peer *peer)
{
struct bitcoin_tx *close_tx;
secp256k1_ecdsa_signature our_close_sig;
close_tx = peer_create_close_tx(ctx, peer, peer->closing.their_fee);
peer_sign_mutual_close(peer, close_tx, &our_close_sig);
close_tx->input[0].witness
= bitcoin_witness_2of2(close_tx->input,
peer->closing.their_sig,
&our_close_sig,
&peer->remote.commitkey,
&peer->local.commitkey);
return close_tx;
}
/* Create a bitcoin spend tx (to spend our commit's outputs) */
static const struct bitcoin_tx *bitcoin_spend_ours(struct peer *peer)
{
u8 *witnessscript;
const struct bitcoin_tx *commit = peer->local.commit->tx;
secp256k1_ecdsa_signature sig;
struct bitcoin_tx *tx;
unsigned int p2wsh_out;
uint64_t fee;
/* The redeemscript for a commit tx is fairly complex. */
witnessscript = bitcoin_redeem_secret_or_delay(peer,
&peer->local.finalkey,
&peer->remote.locktime,
&peer->remote.finalkey,
&peer->local.commit->revocation_hash);
/* Now, create transaction to spend it. */
tx = bitcoin_tx(peer, 1, 1);
tx->input[0].txid = peer->local.commit->txid;
p2wsh_out = find_p2wsh_out(commit, witnessscript);
tx->input[0].index = p2wsh_out;
tx->input[0].sequence_number = bitcoin_nsequence(&peer->remote.locktime);
tx->input[0].amount = tal_dup(tx->input, u64,
&commit->output[p2wsh_out].amount);
tx->output[0].script = scriptpubkey_p2sh(tx,
bitcoin_redeem_single(tx,
&peer->local.finalkey));
/* Witness length can vary, due to DER encoding of sigs, but we
* use 176 from an example run. */
assert(measure_tx_cost(tx) == 83 * 4);
fee = fee_by_feerate(83 + 176 / 4, get_feerate(peer->dstate->topology));
/* FIXME: Fail gracefully in these cases (not worth collecting) */
if (fee > commit->output[p2wsh_out].amount
|| is_dust(commit->output[p2wsh_out].amount - fee))
fatal("Amount of %"PRIu64" won't cover fee %"PRIu64,
commit->output[p2wsh_out].amount, fee);
tx->output[0].amount = commit->output[p2wsh_out].amount - fee;
peer_sign_spend(peer, tx, witnessscript, &sig);
tx->input[0].witness = bitcoin_witness_secret(tx,
NULL, 0, &sig,
witnessscript);
return tx;
}
/* Sign and local commit tx */
static void sign_commit_tx(struct peer *peer)
{
secp256k1_ecdsa_signature sig;
/* Can't be signed already, and can't have scriptsig! */
assert(!peer->local.commit->tx->input[0].script);
assert(!peer->local.commit->tx->input[0].witness);
peer_sign_ourcommit(peer, peer->local.commit->tx, &sig);
peer->local.commit->tx->input[0].witness
= bitcoin_witness_2of2(peer->local.commit->tx->input,
peer->local.commit->sig,
&sig,
&peer->remote.commitkey,
&peer->local.commitkey);
}
static u64 commit_tx_fee(const struct bitcoin_tx *commit, u64 anchor_satoshis)
{
uint64_t i, total = 0;
for (i = 0; i < tal_count(commit->output); i++)
total += commit->output[i].amount;
assert(anchor_satoshis >= total);
return anchor_satoshis - total;
}
struct peer *find_peer(struct lightningd_state *dstate, const struct pubkey *id)
{
struct peer *peer;
list_for_each(&dstate->peers, peer, list) {
if (peer->id && pubkey_eq(peer->id, id))
return peer;
}
return NULL;
}
struct peer *find_peer_by_pkhash(struct lightningd_state *dstate, const u8 *pkhash)
{
struct peer *peer;
u8 addr[20];
list_for_each(&dstate->peers, peer, list) {
pubkey_hash160(addr, peer->id);
if (memcmp(addr, pkhash, sizeof(addr)) == 0)
return peer;
}
return NULL;
}
void debug_dump_peers(struct lightningd_state *dstate)
{
struct peer *peer;
list_for_each(&dstate->peers, peer, list) {
if (!peer->local.commit
|| !peer->remote.commit)
continue;
log_debug_struct(peer->log, "our cstate: %s",
struct channel_state,
peer->local.commit->cstate);
log_debug_struct(peer->log, "their cstate: %s",
struct channel_state,
peer->remote.commit->cstate);
}
}
static struct peer *find_peer_json(struct lightningd_state *dstate,
const char *buffer,
jsmntok_t *peeridtok)
{
struct pubkey peerid;
if (!pubkey_from_hexstr(buffer + peeridtok->start,
peeridtok->end - peeridtok->start, &peerid))
return NULL;
return find_peer(dstate, &peerid);
}
static bool peer_uncommitted_changes(const struct peer *peer)
{
struct htlc_map_iter it;
struct htlc *h;
enum feechange_state i;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (htlc_has(h, HTLC_REMOTE_F_PENDING))
return true;
}
/* Pending feechange we sent, or pending ack of theirs. */
for (i = 0; i < ARRAY_SIZE(peer->feechanges); i++) {
if (!peer->feechanges[i])
continue;
if (feechange_state_flags(i) & HTLC_REMOTE_F_PENDING)
return true;
}
return false;
}
static void remote_changes_pending(struct peer *peer)
{
if (!peer->commit_timer) {
log_debug(peer->log, "remote_changes_pending: adding timer");
peer->commit_timer = new_reltimer(&peer->dstate->timers, peer,
peer->dstate->config.commit_time,
try_commit, peer);
} else
log_debug(peer->log, "remote_changes_pending: timer already exists");
}
static void peer_update_complete(struct peer *peer)
{
log_debug(peer->log, "peer_update_complete");
if (peer->commit_jsoncmd) {
command_success(peer->commit_jsoncmd,
null_response(peer->commit_jsoncmd));
peer->commit_jsoncmd = NULL;
}
/* Have we got more changes in the meantime? */
if (peer_uncommitted_changes(peer)) {
log_debug(peer->log, "peer_update_complete: more changes!");
remote_changes_pending(peer);
}
}
/* FIXME: Split success and fail functions, roll state changes etc into
* success case. */
static void peer_open_complete(struct peer *peer, const char *problem)
{
if (problem) {
log_unusual(peer->log, "peer open failed: %s", problem);
if (peer->open_jsoncmd) {
command_fail(peer->open_jsoncmd, "%s", problem);
peer->open_jsoncmd = NULL;
}
} else {
log_debug(peer->log, "peer open complete");
assert(!peer->nc);
/* We're connected, so record it. */
peer->nc = add_connection(peer->dstate->rstate,
&peer->dstate->id, peer->id,
peer->dstate->config.fee_base,
peer->dstate->config.fee_per_satoshi,
peer->dstate->config.min_htlc_expiry,
peer->dstate->config.min_htlc_expiry);
if (peer->open_jsoncmd) {
struct json_result *response;
response = new_json_result(peer->open_jsoncmd);
json_object_start(response, NULL);
json_add_pubkey(response, "id", peer->id);
json_object_end(response);
command_success(peer->open_jsoncmd, response);
peer->open_jsoncmd = NULL;
}
}
}
static void set_peer_state(struct peer *peer, enum state newstate,
const char *caller, bool db_commit)
{
log_debug(peer->log, "%s: %s => %s", caller,
state_name(peer->state), state_name(newstate));
peer->state = newstate;
/* We can only route in normal state. */
if (!state_is_normal(peer->state))
peer->nc = tal_free(peer->nc);
if (db_commit)
db_update_state(peer);
}
static void peer_breakdown(struct peer *peer)
{
if (peer->commit_jsoncmd) {
command_fail(peer->commit_jsoncmd, "peer breakdown");
peer->commit_jsoncmd = NULL;
}
/* FIXME: Reason. */
if (peer->open_jsoncmd) {
command_fail(peer->open_jsoncmd, "peer breakdown");
peer->open_jsoncmd = NULL;
}
/* If we have a closing tx, use it. */
if (peer->closing.their_sig) {
const struct bitcoin_tx *close = mk_bitcoin_close(peer, peer);
log_unusual(peer->log, "Peer breakdown: sending close tx");
broadcast_tx(peer->dstate->topology, peer, close, NULL);
tal_free(close);
/* If we have a signed commit tx (maybe not if we just offered
* anchor, or they supplied anchor, or no outputs to us). */
} else if (peer->local.commit && peer->local.commit->sig) {
log_unusual(peer->log, "Peer breakdown: sending commit tx");
sign_commit_tx(peer);
broadcast_tx(peer->dstate->topology, peer,
peer->local.commit->tx, NULL);
} else {
log_info(peer->log, "Peer breakdown: nothing to do");
/* We close immediately. */
set_peer_state(peer, STATE_CLOSED, __func__, false);
db_forget_peer(peer);
}
/* Always wake peer to close or flush packets. */
io_wake(peer);
}
/* All unrevoked commit txs must have no HTLCs in them. */
static bool committed_to_htlcs(const struct peer *peer)
{
struct htlc_map_iter it;
struct htlc *h;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (htlc_is_dead(h))
continue;
return true;
}
return false;
}
static void peer_calculate_close_fee(struct peer *peer)
{
/* Use actual worst-case length of close tx: based on FIXME-OLD#02's
* commitment tx numbers, but only 1 byte for output count */
const uint64_t txsize = 41 + 221 + 10 + 32 + 32;
uint64_t maxfee;
peer->closing.our_fee
= fee_by_feerate(txsize, get_feerate(peer->dstate->topology));
/* FIXME-OLD #2:
* The sender MUST set `close_fee` lower than or equal to the
* fee of the final commitment transaction, and MUST set
* `close_fee` to an even number of satoshis.
*/
maxfee = commit_tx_fee(peer->local.commit->tx, peer->anchor.satoshis);
if (peer->closing.our_fee > maxfee) {
/* This could only happen if the fee rate dramatically */
log_unusual(peer->log,
"Closing fee %"PRIu64" exceeded commit fee %"PRIu64", reducing.",
peer->closing.our_fee, maxfee);
peer->closing.our_fee = maxfee;
/* This can happen if actual commit txfee is odd. */
if (peer->closing.our_fee & 1)
peer->closing.our_fee--;
}
assert(!(peer->closing.our_fee & 1));
}
static void start_closing_in_transaction(struct peer *peer)
{
assert(!committed_to_htlcs(peer));
set_peer_state(peer, STATE_MUTUAL_CLOSING, __func__, true);
peer_calculate_close_fee(peer);
peer->closing.closing_order = peer->order_counter++;
db_update_our_closing(peer);
queue_pkt_close_signature(peer);
}
static struct io_plan *peer_close(struct io_conn *conn, struct peer *peer)
{
/* Tell writer to wrap it up (may have to xmit first) */
io_wake(peer);
/* We do nothing more. */
return io_wait(conn, NULL, io_never, NULL);
}
void peer_fail(struct peer *peer, const char *caller)
{
/* Don't fail twice. */
if (state_is_error(peer->state) || state_is_onchain(peer->state))
return;
/* FIXME: Save state here? */
set_peer_state(peer, STATE_ERR_BREAKDOWN, caller, false);
peer_breakdown(peer);
}
/* Communication failed: send err (if non-NULL), then dump to chain and close. */
static bool peer_comms_err(struct peer *peer, Pkt *err)
{
if (err)
queue_pkt_err(peer, err);
peer_fail(peer, __func__);
return false;
}
static bool peer_database_err(struct peer *peer)
{
return peer_comms_err(peer, pkt_err(peer, "database error"));
}
/* Unexpected packet received: stop listening, send error, start
* breakdown procedure, return false. */
static bool peer_received_unexpected_pkt(struct peer *peer, const Pkt *pkt,
const char *where)
{
const char *p;
Pkt *err;
log_unusual(peer->log, "%s: received unexpected pkt %u (%s) in %s",
where, pkt->pkt_case, pkt_name(pkt->pkt_case),
state_name(peer->state));
if (pkt->pkt_case != PKT__PKT_ERROR) {
err = pkt_err_unexpected(peer, pkt);
goto out;
}
/* FIXME-OLD #2:
*
* A node MUST fail the connection if it receives an `err`
* message, and MUST NOT send an `err` message in this case.
* For other connection failures, a node SHOULD send an
* informative `err` message.
*/
err = NULL;
/* Check packet for weird chars. */
for (p = pkt->error->problem; *p; p++) {
if (cisprint(*p))
continue;
p = tal_hexstr(peer, pkt->error->problem,
strlen(pkt->error->problem));
log_unusual(peer->log, "Error pkt (hex) %s", p);
tal_free(p);
goto out;
}
log_unusual(peer->log, "Error pkt '%s'", pkt->error->problem);
out:
return peer_comms_err(peer, err);
}
/* Creation the bitcoin anchor tx, spending output user provided. */
static bool bitcoin_create_anchor(struct peer *peer)
{
struct bitcoin_tx *tx = bitcoin_tx(peer, 1, 1);
size_t i;
/* We must be offering anchor for us to try creating it */
assert(peer->local.offer_anchor);
tx->output[0].script = scriptpubkey_p2wsh(tx, peer->anchor.witnessscript);
tx->output[0].amount = peer->anchor.input->out_amount;
tx->input[0].txid = peer->anchor.input->txid;
tx->input[0].index = peer->anchor.input->index;
tx->input[0].amount = tal_dup(tx->input, u64,
&peer->anchor.input->in_amount);
if (!wallet_add_signed_input(peer->dstate,
&peer->anchor.input->walletkey,
tx, 0))
return false;
bitcoin_txid(tx, &peer->anchor.txid);
peer->anchor.tx = tx;
peer->anchor.index = 0;
/* We'll need this later, when we're told to broadcast it. */
peer->anchor.satoshis = tx->output[0].amount;
/* To avoid malleation, all inputs must be segwit! */
for (i = 0; i < tal_count(tx->input); i++)
assert(tx->input[i].witness);
return true;
}
static bool open_pkt_in(struct peer *peer, const Pkt *pkt)
{
Pkt *err;
struct commit_info *ci;
assert(peer->state == STATE_OPEN_WAIT_FOR_OPENPKT);
if (pkt->pkt_case != PKT__PKT_OPEN)
return peer_received_unexpected_pkt(peer, pkt, __func__);
db_start_transaction(peer);
ci = new_commit_info(peer, 0);
err = accept_pkt_open(peer, pkt, &ci->revocation_hash,
&peer->remote.next_revocation_hash);
if (err) {
db_abort_transaction(peer);
return peer_comms_err(peer, err);
}
db_set_visible_state(peer);
/* Set up their commit info now: rest gets done in setup_first_commit
* once anchor is established. */
peer->remote.commit = ci;
/* Witness script for anchor. */
peer->anchor.witnessscript
= bitcoin_redeem_2of2(peer,
&peer->local.commitkey,
&peer->remote.commitkey);
if (peer->local.offer_anchor) {
if (!bitcoin_create_anchor(peer)) {
db_abort_transaction(peer);
err = pkt_err(peer, "Own anchor unavailable");
return peer_comms_err(peer, err);
}
/* FIXME: Redundant with peer->local.offer_anchor? */
peer->anchor.ours = true;
/* This shouldn't happen! */
if (!setup_first_commit(peer)) {
db_abort_transaction(peer);
err = pkt_err(peer, "Own anchor has insufficient funds");
return peer_comms_err(peer, err);
}
set_peer_state(peer, STATE_OPEN_WAIT_FOR_COMMIT_SIGPKT,
__func__, true);
if (db_commit_transaction(peer) != NULL)
return peer_database_err(peer);
queue_pkt_anchor(peer);
return true;
} else {
set_peer_state(peer, STATE_OPEN_WAIT_FOR_ANCHORPKT,
__func__, true);
if (db_commit_transaction(peer) != NULL)
return peer_database_err(peer);
return true;
}
}
static void funding_tx_failed(struct peer *peer,
int exitstatus,
const char *err)
{
const char *str = tal_fmt(peer, "Broadcasting funding gave %i: %s",
exitstatus, err);
peer_open_complete(peer, str);
peer_breakdown(peer);
queue_pkt_err(peer, pkt_err(peer, "Funding failed"));
}
static bool open_ouranchor_pkt_in(struct peer *peer, const Pkt *pkt)
{
Pkt *err;
if (pkt->pkt_case != PKT__PKT_OPEN_COMMIT_SIG)
return peer_received_unexpected_pkt(peer, pkt, __func__);
peer->local.commit->sig = tal(peer->local.commit,
secp256k1_ecdsa_signature);
err = accept_pkt_open_commit_sig(peer, pkt,
peer->local.commit->sig);
if (!err &&
!check_tx_sig(peer->local.commit->tx, 0,
NULL,
peer->anchor.witnessscript,
&peer->remote.commitkey,
peer->local.commit->sig))
err = pkt_err(peer, "Bad signature");
if (err) {
peer->local.commit->sig = tal_free(peer->local.commit->sig);
return peer_comms_err(peer, err);
}
peer->their_commitsigs++;
db_start_transaction(peer);
db_set_anchor(peer);
db_new_commit_info(peer, LOCAL, NULL);
set_peer_state(peer,
STATE_OPEN_WAIT_ANCHORDEPTH_AND_THEIRCOMPLETE,
__func__, true);
if (db_commit_transaction(peer) != NULL)
return peer_database_err(peer);
broadcast_tx(peer->dstate->topology,
peer, peer->anchor.tx, funding_tx_failed);
peer_watch_anchor(peer, peer->local.mindepth);
return true;
}
static bool open_theiranchor_pkt_in(struct peer *peer, const Pkt *pkt)
{
Pkt *err;
const char *db_err;
if (pkt->pkt_case != PKT__PKT_OPEN_ANCHOR)
return peer_received_unexpected_pkt(peer, pkt, __func__);
err = accept_pkt_anchor(peer, pkt);
if (err) {
peer_open_complete(peer, err->error->problem);
return peer_comms_err(peer, err);
}
peer->anchor.ours = false;
if (!setup_first_commit(peer)) {
err = pkt_err(peer, "Insufficient funds for fee");
peer_open_complete(peer, err->error->problem);
return peer_comms_err(peer, err);
}
log_debug_struct(peer->log, "Creating sig for %s",
struct bitcoin_tx,
peer->remote.commit->tx);
log_add_struct(peer->log, " using key %s",
struct pubkey, &peer->local.commitkey);
peer->remote.commit->sig = tal(peer->remote.commit,
secp256k1_ecdsa_signature);
peer_sign_theircommit(peer, peer->remote.commit->tx,
peer->remote.commit->sig);
peer->remote.commit->order = peer->order_counter++;
db_start_transaction(peer);
db_set_anchor(peer);
db_new_commit_info(peer, REMOTE, NULL);
peer_add_their_commit(peer,
&peer->remote.commit->txid,
peer->remote.commit->commit_num);
set_peer_state(peer, STATE_OPEN_WAIT_ANCHORDEPTH_AND_THEIRCOMPLETE,
__func__, true);
db_err = db_commit_transaction(peer);
if (db_err) {
peer_open_complete(peer, db_err);
return peer_database_err(peer);
}
queue_pkt_open_commit_sig(peer);
peer_watch_anchor(peer, peer->local.mindepth);
return true;
}
/* Dump all known channels and nodes to the peer. Used when a new
* connection was established. */
static void sync_routing_table(struct lightningd_state *dstate, struct peer *peer)
{
struct node *n;
struct node_map_iter it;
int i;
struct node_connection *nc;
for (n = node_map_first(dstate->rstate->nodes, &it); n; n = node_map_next(dstate->rstate->nodes, &it)) {
size_t num_edges = tal_count(n->out);
for (i = 0; i < num_edges; i++) {
nc = n->out[i];
if (nc->channel_announcement)
queue_pkt_nested(peer, WIRE_CHANNEL_ANNOUNCEMENT, nc->channel_announcement);
if (nc->channel_update)
queue_pkt_nested(peer, WIRE_CHANNEL_UPDATE, nc->channel_update);
}
if (n->node_announcement && num_edges > 0)
queue_pkt_nested(peer, WIRE_NODE_ANNOUNCEMENT, n->node_announcement);
}
}
static bool open_wait_pkt_in(struct peer *peer, const Pkt *pkt)
{
Pkt *err;
const char *db_err;
/* If they want to shutdown during this, we do mutual close dance. */
if (pkt->pkt_case == PKT__PKT_CLOSE_SHUTDOWN) {
err = accept_pkt_close_shutdown(peer, pkt);
if (err)
return peer_comms_err(peer, err);
peer_open_complete(peer, "Shutdown request received");
db_start_transaction(peer);
db_set_their_closing_script(peer);
start_closing_in_transaction(peer);
if (db_commit_transaction(peer) != NULL)
return peer_database_err(peer);
return false;
}
switch (peer->state) {
case STATE_OPEN_WAIT_ANCHORDEPTH_AND_THEIRCOMPLETE:
case STATE_OPEN_WAIT_THEIRCOMPLETE:
if (pkt->pkt_case != PKT__PKT_OPEN_COMPLETE)
return peer_received_unexpected_pkt(peer, pkt, __func__);
err = accept_pkt_open_complete(peer, pkt);
if (err) {
peer_open_complete(peer, err->error->problem);
return peer_comms_err(peer, err);
}
db_start_transaction(peer);
if (peer->state == STATE_OPEN_WAIT_THEIRCOMPLETE) {
peer_open_complete(peer, NULL);
set_peer_state(peer, STATE_NORMAL, __func__, true);
announce_channel(peer->dstate, peer);
sync_routing_table(peer->dstate, peer);
} else {
set_peer_state(peer, STATE_OPEN_WAIT_ANCHORDEPTH,
__func__, true);
}
db_err = db_commit_transaction(peer);
if (db_err) {
peer_open_complete(peer, db_err);
return peer_database_err(peer);
}
return true;
case STATE_OPEN_WAIT_ANCHORDEPTH:
return peer_received_unexpected_pkt(peer, pkt, __func__);
default:
log_unusual(peer->log,
"%s: unexpected state %s",
__func__, state_name(peer->state));
peer_fail(peer, __func__);
return false;
}
}
static void set_htlc_rval(struct peer *peer,
struct htlc *htlc, const struct preimage *rval)
{
assert(!htlc->r);
assert(!htlc->fail);
htlc->r = tal_dup(htlc, struct preimage, rval);
db_htlc_fulfilled(peer, htlc);
}
static void set_htlc_fail(struct peer *peer,
struct htlc *htlc, const void *fail, size_t len)
{
assert(!htlc->r);
assert(!htlc->fail);
htlc->fail = tal_dup_arr(htlc, u8, fail, len, 0);
db_htlc_failed(peer, htlc);
}
static void route_htlc_onwards(struct peer *peer,
struct htlc *htlc,
u64 msatoshi,
const u8 *pb_id,
const u8 *rest_of_route,
const struct peer *only_dest)
{
struct peer *next;
struct htlc *newhtlc;
enum fail_error error_code;
const char *err;
if (!only_dest) {
log_debug_struct(peer->log, "Forwarding HTLC %s",
struct sha256, &htlc->rhash);
log_add(peer->log, " (id %"PRIu64")", htlc->id);
}
next = find_peer_by_pkhash(peer->dstate, pb_id);
if (!next || !next->nc) {
log_unusual(peer->log, "Can't route HTLC %"PRIu64": no %speer ",
htlc->id, next ? "ready " : "");
if (!peer->dstate->dev_never_routefail)
command_htlc_set_fail(peer, htlc, NOT_FOUND_404,
"Unknown peer");
return;
}
if (only_dest && next != only_dest)
return;
/* Offered fee must be sufficient. */
if ((s64)(htlc->msatoshi - msatoshi)
< connection_fee(next->nc, msatoshi)) {
log_unusual(peer->log,
"Insufficient fee for HTLC %"PRIu64
": %"PRIi64" on %"PRIu64,
htlc->id, htlc->msatoshi - msatoshi,
msatoshi);
command_htlc_set_fail(peer, htlc, PAYMENT_REQUIRED_402,
"Insufficent fee");
return;
}
log_debug_struct(peer->log, "HTLC forward to %s",
struct pubkey, next->id);
/* This checks the HTLC itself is possible. */
err = command_htlc_add(next, msatoshi,
abs_locktime_to_blocks(&htlc->expiry)
- next->nc->delay,
&htlc->rhash, htlc, rest_of_route,
&error_code, &newhtlc);
if (err)
command_htlc_set_fail(peer, htlc, error_code, err);
}
static void their_htlc_added(struct peer *peer, struct htlc *htlc,
struct peer *only_dest)
{
struct invoice *invoice;
struct privkey pk;
struct onionpacket *packet;
struct route_step *step = NULL;
if (abs_locktime_is_seconds(&htlc->expiry)) {
log_unusual(peer->log, "HTLC %"PRIu64" is in seconds", htlc->id);
command_htlc_set_fail(peer, htlc, BAD_REQUEST_400,
"bad locktime");
return;
}
if (abs_locktime_to_blocks(&htlc->expiry) <=
get_block_height(peer->dstate->topology) + peer->dstate->config.min_htlc_expiry) {
log_unusual(peer->log, "HTLC %"PRIu64" expires too soon:"
" block %u",
htlc->id, abs_locktime_to_blocks(&htlc->expiry));
command_htlc_set_fail(peer, htlc, BAD_REQUEST_400,
"expiry too soon");
return;
}
if (abs_locktime_to_blocks(&htlc->expiry) >
get_block_height(peer->dstate->topology) + peer->dstate->config.max_htlc_expiry) {
log_unusual(peer->log, "HTLC %"PRIu64" expires too far:"
" block %u",
htlc->id, abs_locktime_to_blocks(&htlc->expiry));
command_htlc_set_fail(peer, htlc, BAD_REQUEST_400,
"expiry too far");
return;
}
//FIXME: dirty trick to retrieve unexported state
memcpy(&pk, peer->dstate->secret, sizeof(pk));
packet = parse_onionpacket(peer,
htlc->routing, tal_count(htlc->routing));
if (packet) {
u8 shared_secret[32];
if (onion_shared_secret(shared_secret, packet, &pk))
step = process_onionpacket(packet, packet,
shared_secret,
htlc->rhash.u.u8,
sizeof(htlc->rhash));
}
if (!step) {
log_unusual(peer->log, "Bad onion, failing HTLC %"PRIu64,
htlc->id);
command_htlc_set_fail(peer, htlc, BAD_REQUEST_400,
"invalid onion");
goto free_packet;
}
switch (step->nextcase) {
case ONION_END:
if (only_dest)
goto free_packet;
invoice = find_unpaid(peer->dstate->invoices, &htlc->rhash);
if (!invoice) {
log_unusual(peer->log, "No invoice for HTLC %"PRIu64,
htlc->id);
log_add_struct(peer->log, " rhash=%s",
struct sha256, &htlc->rhash);
if (unlikely(!peer->dstate->dev_never_routefail))
command_htlc_set_fail(peer, htlc,
UNAUTHORIZED_401,
"unknown rhash");
goto free_packet;
}
if (htlc->msatoshi != invoice->msatoshi) {
log_unusual(peer->log, "Short payment for '%s' HTLC %"PRIu64
": %"PRIu64" not %"PRIu64 " satoshi!",
invoice->label,
htlc->id,
htlc->msatoshi,
invoice->msatoshi);
command_htlc_set_fail(peer, htlc,
UNAUTHORIZED_401,
"incorrect amount");
goto free_packet;
}
log_info(peer->log, "Immediately resolving '%s' HTLC %"PRIu64,
invoice->label, htlc->id);
resolve_invoice(peer->dstate, invoice);
set_htlc_rval(peer, htlc, &invoice->r);
command_htlc_fulfill(peer, htlc);
goto free_packet;
case ONION_FORWARD:
route_htlc_onwards(peer, htlc, step->hoppayload->amount, step->next->nexthop,
serialize_onionpacket(step, step->next), only_dest);
goto free_packet;
default:
log_info(peer->log, "Unknown step type %u", step->nextcase);
command_htlc_set_fail(peer, htlc, VERSION_NOT_SUPPORTED_505,
"unknown step type");
goto free_packet;
}
free_packet:
tal_free(packet);
}
static void our_htlc_failed(struct peer *peer, struct htlc *htlc)
{
assert(htlc_owner(htlc) == LOCAL);
if (htlc->src) {
set_htlc_fail(htlc->src->peer, htlc->src,
htlc->fail, tal_count(htlc->fail));
command_htlc_fail(htlc->src->peer, htlc->src);
} else
complete_pay_command(peer->dstate, htlc);
}
static void our_htlc_fulfilled(struct peer *peer, struct htlc *htlc)
{
if (htlc->src) {
set_htlc_rval(htlc->src->peer, htlc->src, htlc->r);
command_htlc_fulfill(htlc->src->peer, htlc->src);
} else {
complete_pay_command(peer->dstate, htlc);
}
}
/* FIXME: Slow! */
static struct htlc *htlc_with_source(struct peer *peer, struct htlc *src)
{
struct htlc_map_iter it;
struct htlc *h;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (h->src == src)
return h;
}
return NULL;
}
/* peer has come back online: re-send any we have to send to them. */
static void retry_all_routing(struct peer *restarted_peer)
{
struct peer *peer;
struct htlc_map_iter it;
struct htlc *h;
/* Look for added htlcs from other peers which need to go here. */
list_for_each(&restarted_peer->dstate->peers, peer, list) {
if (peer == restarted_peer)
continue;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (h->state != RCVD_ADD_ACK_REVOCATION)
continue;
if (htlc_with_source(peer, h))
continue;
their_htlc_added(peer, h, restarted_peer);
}
}
/* Catch any HTLCs which are fulfilled, but the message got reset
* by reconnect. */
for (h = htlc_map_first(&restarted_peer->htlcs, &it);
h;
h = htlc_map_next(&restarted_peer->htlcs, &it)) {
if (h->state != RCVD_ADD_ACK_REVOCATION)
continue;
if (h->r)
command_htlc_fulfill(restarted_peer, h);
else if (h->fail)
command_htlc_fail(restarted_peer, h);
}
}
static bool adjust_cstate_side(struct channel_state *cstate,
struct htlc *h,
enum htlc_state old, enum htlc_state new,
enum side side)
{
int oldf = htlc_state_flags(old), newf = htlc_state_flags(new);
bool old_committed, new_committed;
/* We applied changes to staging_cstate when we first received
* add/remove packet, so we could make sure it was valid. Don't
* do that again. */
if (old == SENT_ADD_HTLC || old == RCVD_REMOVE_HTLC
|| old == RCVD_ADD_HTLC || old == SENT_REMOVE_HTLC)
return true;
old_committed = (oldf & HTLC_FLAG(side, HTLC_F_COMMITTED));
new_committed = (newf & HTLC_FLAG(side, HTLC_F_COMMITTED));
if (old_committed && !new_committed) {
if (h->r)
cstate_fulfill_htlc(cstate, h);
else
cstate_fail_htlc(cstate, h);
} else if (!old_committed && new_committed) {
if (!cstate_add_htlc(cstate, h, false)) {
log_broken_struct(h->peer->log,
"Cannot afford htlc %s",
struct htlc, h);
log_add_struct(h->peer->log, " channel state %s",
struct channel_state, cstate);
return false;
}
}
return true;
}
/* We apply changes to staging_cstate when we first PENDING, so we can
* make sure they're valid. So here we change the staging_cstate on
* the revocation receive (ie. when acked). */
static bool adjust_cstates(struct peer *peer, struct htlc *h,
enum htlc_state old, enum htlc_state new)
{
return adjust_cstate_side(peer->remote.staging_cstate, h, old, new,
REMOTE)
&& adjust_cstate_side(peer->local.staging_cstate, h, old, new,
LOCAL);
}
static void adjust_cstate_fee_side(struct channel_state *cstate,
const struct feechange *f,
enum feechange_state old,
enum feechange_state new,
enum side side)
{
/* We applied changes to staging_cstate when we first received
* feechange packet, so we could make sure it was valid. Don't
* do that again. */
if (old == SENT_FEECHANGE || old == RCVD_FEECHANGE)
return;
/* Feechanges only ever get applied to the side which created them:
* ours gets applied when they ack, theirs gets applied when we ack. */
if (side == LOCAL && new == RCVD_FEECHANGE_REVOCATION)
adjust_fee(cstate, f->fee_rate);
else if (side == REMOTE && new == SENT_FEECHANGE_REVOCATION)
adjust_fee(cstate, f->fee_rate);
}
static void adjust_cstates_fee(struct peer *peer, const struct feechange *f,
enum feechange_state old,
enum feechange_state new)
{
adjust_cstate_fee_side(peer->remote.staging_cstate, f, old, new, REMOTE);
adjust_cstate_fee_side(peer->local.staging_cstate, f, old, new, LOCAL);
}
static void check_both_committed(struct peer *peer, struct htlc *h)
{
if (!htlc_has(h, HTLC_ADDING) && !htlc_has(h, HTLC_REMOVING))
log_debug(peer->log,
"Both committed to %s of %s HTLC %"PRIu64 "(%s)",
h->state == SENT_ADD_ACK_REVOCATION
|| h->state == RCVD_ADD_ACK_REVOCATION ? "ADD"
: h->r ? "FULFILL" : "FAIL",
htlc_owner(h) == LOCAL ? "our" : "their",
h->id, htlc_state_name(h->state));
switch (h->state) {
case RCVD_REMOVE_ACK_REVOCATION:
/* If it was fulfilled, we handled it immediately. */
if (h->fail)
our_htlc_failed(peer, h);
break;
case RCVD_ADD_ACK_REVOCATION:
their_htlc_added(peer, h, NULL);
break;
default:
break;
}
}
struct htlcs_table {
enum htlc_state from, to;
};
struct feechanges_table {
enum feechange_state from, to;
};
static const char *changestates(struct peer *peer,
const struct htlcs_table *table,
size_t n,
const struct feechanges_table *ftable,
size_t n_ftable,
bool db_commit)
{
struct htlc_map_iter it;
struct htlc *h;
bool changed = false;
size_t i;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
for (i = 0; i < n; i++) {
if (h->state == table[i].from) {
if (!adjust_cstates(peer, h,
table[i].from, table[i].to))
return "accounting error";
htlc_changestate(h, table[i].from,
table[i].to, db_commit);
check_both_committed(peer, h);
changed = true;
}
}
}
for (i = 0; i < n_ftable; i++) {
struct feechange *f = peer->feechanges[ftable[i].from];
if (!f)
continue;
adjust_cstates_fee(peer, f, ftable[i].from, ftable[i].to);
feechange_changestate(peer, f,
ftable[i].from, ftable[i].to,
db_commit);
changed = true;
}
/* FIXME-OLD #2:
*
* A node MUST NOT send an `update_commit` message which does
* not include any updates.
*/
if (!changed)
return "no changes made";
return NULL;
}
/* This is the io loop while we're negotiating closing tx. */
static bool closing_pkt_in(struct peer *peer, const Pkt *pkt)
{
const CloseSignature *c = pkt->close_signature;
struct bitcoin_tx *close_tx;
secp256k1_ecdsa_signature theirsig;
assert(peer->state == STATE_MUTUAL_CLOSING);
if (pkt->pkt_case != PKT__PKT_CLOSE_SIGNATURE)
return peer_received_unexpected_pkt(peer, pkt, __func__);
log_info(peer->log, "closing_pkt_in: they offered close fee %"PRIu64,
c->close_fee);
/* FIXME-OLD #2:
*
* The sender MUST set `close_fee` lower than or equal to the fee of the
* final commitment transaction, and MUST set `close_fee` to an even
* number of satoshis.
*/
if ((c->close_fee & 1)
|| c->close_fee > commit_tx_fee(peer->remote.commit->tx,
peer->anchor.satoshis)) {
return peer_comms_err(peer, pkt_err(peer, "Invalid close fee"));
}
/* FIXME: Don't accept tiny fee at all? */
/* FIXME-OLD #2:
... otherwise it SHOULD propose a
value strictly between the received `close_fee` and its
previously-sent `close_fee`.
*/
if (peer->closing.their_sig) {
/* We want more, they should give more. */
if (peer->closing.our_fee > peer->closing.their_fee) {
if (c->close_fee <= peer->closing.their_fee)
return peer_comms_err(peer,
pkt_err(peer, "Didn't increase close fee"));
} else {
if (c->close_fee >= peer->closing.their_fee)
return peer_comms_err(peer,
pkt_err(peer, "Didn't decrease close fee"));
}
}
/* FIXME-OLD #2:
*
* The receiver MUST check `sig` is valid for the close
* transaction with the given `close_fee`, and MUST fail the
* connection if it is not. */
if (!proto_to_signature(c->sig, &theirsig))
return peer_comms_err(peer,
pkt_err(peer, "Invalid signature format"));
close_tx = peer_create_close_tx(c, peer, c->close_fee);
if (!check_tx_sig(close_tx, 0,
NULL,
peer->anchor.witnessscript,
&peer->remote.commitkey, &theirsig))
return peer_comms_err(peer,
pkt_err(peer, "Invalid signature"));
tal_free(peer->closing.their_sig);
peer->closing.their_sig = tal_dup(peer,
secp256k1_ecdsa_signature, &theirsig);
peer->closing.their_fee = c->close_fee;
peer->closing.sigs_in++;
if (!db_update_their_closing(peer))
return peer_database_err(peer);
if (peer->closing.our_fee != peer->closing.their_fee) {
/* FIXME-OLD #2:
*
* If the receiver agrees with the fee, it SHOULD reply with a
* `close_signature` with the same `close_fee` value,
* otherwise it SHOULD propose a value strictly between the
* received `close_fee` and its previously-sent `close_fee`.
*/
/* Adjust our fee to close on their fee. */
u64 sum;
/* Beware overflow! */
sum = (u64)peer->closing.our_fee + peer->closing.their_fee;
peer->closing.our_fee = sum / 2;
if (peer->closing.our_fee & 1)
peer->closing.our_fee++;
log_info(peer->log, "accept_pkt_close_sig: we change to %"PRIu64,
peer->closing.our_fee);
peer->closing.closing_order = peer->order_counter++;
db_start_transaction(peer);
db_update_our_closing(peer);
if (db_commit_transaction(peer) != NULL)
return peer_database_err(peer);
queue_pkt_close_signature(peer);
}
/* Note corner case: we may *now* agree with them! */
if (peer->closing.our_fee == peer->closing.their_fee) {
const struct bitcoin_tx *close;
log_info(peer->log, "accept_pkt_close_sig: we agree");
/* FIXME-OLD #2:
*
* Once a node has sent or received a `close_signature` with
* matching `close_fee` it SHOULD close the connection and
* SHOULD sign and broadcast the final closing transaction.
*/
close = mk_bitcoin_close(peer, peer);
broadcast_tx(peer->dstate->topology, peer, close, NULL);
tal_free(close);
return false;
}
return true;
}
/* We can get update_commit in both normal and shutdown states. */
static Pkt *handle_pkt_commit(struct peer *peer, const Pkt *pkt)
{
Pkt *err;
const char *errmsg;
struct sha256 preimage;
struct commit_info *ci;
bool to_them_only;
/* FIXME: We can actually merge these two... */
static const struct htlcs_table commit_changes[] = {
{ RCVD_ADD_REVOCATION, RCVD_ADD_ACK_COMMIT },
{ RCVD_REMOVE_HTLC, RCVD_REMOVE_COMMIT },
{ RCVD_ADD_HTLC, RCVD_ADD_COMMIT },
{ RCVD_REMOVE_REVOCATION, RCVD_REMOVE_ACK_COMMIT }
};
static const struct feechanges_table commit_feechanges[] = {
{ RCVD_FEECHANGE_REVOCATION, RCVD_FEECHANGE_ACK_COMMIT },
{ RCVD_FEECHANGE, RCVD_FEECHANGE_COMMIT }
};
static const struct htlcs_table revocation_changes[] = {
{ RCVD_ADD_ACK_COMMIT, SENT_ADD_ACK_REVOCATION },
{ RCVD_REMOVE_COMMIT, SENT_REMOVE_REVOCATION },
{ RCVD_ADD_COMMIT, SENT_ADD_REVOCATION },
{ RCVD_REMOVE_ACK_COMMIT, SENT_REMOVE_ACK_REVOCATION }
};
static const struct feechanges_table revocation_feechanges[] = {
{ RCVD_FEECHANGE_ACK_COMMIT, SENT_FEECHANGE_ACK_REVOCATION },
{ RCVD_FEECHANGE_COMMIT, SENT_FEECHANGE_REVOCATION }
};
ci = new_commit_info(peer, peer->local.commit->commit_num + 1);
db_start_transaction(peer);
/* FIXME-OLD #2:
*
* A node MUST NOT send an `update_commit` message which does
* not include any updates.
*/
errmsg = changestates(peer,
commit_changes, ARRAY_SIZE(commit_changes),
commit_feechanges, ARRAY_SIZE(commit_feechanges),
true);
if (errmsg) {
db_abort_transaction(peer);
return pkt_err(peer, "%s", errmsg);
}
/* Create new commit info for this commit tx. */
ci->revocation_hash = peer->local.next_revocation_hash;
/* FIXME-OLD #2:
*
* A receiving node MUST apply all local acked and unacked
* changes except unacked fee changes to the local commitment
*/
/* (We already applied them to staging_cstate as we went) */
ci->cstate = copy_cstate(ci, peer->local.staging_cstate);
ci->tx = create_commit_tx(ci, peer, &ci->revocation_hash,
ci->cstate, LOCAL, &to_them_only);
bitcoin_txid(ci->tx, &ci->txid);
log_debug(peer->log, "Check tx %"PRIu64" sig", ci->commit_num);
log_add_struct(peer->log, " for %s", struct channel_state, ci->cstate);
log_add_struct(peer->log, " (txid %s)", struct sha256_double, &ci->txid);
/* FIXME-OLD #2:
*
* If the commitment transaction has only a single output which pays
* to the other node, `sig` MUST be unset. Otherwise, a sending node
* MUST apply all remote acked and unacked changes except unacked fee
* changes to the remote commitment before generating `sig`.
*/
if (!to_them_only)
ci->sig = tal(ci, secp256k1_ecdsa_signature);
err = accept_pkt_commit(peer, pkt, ci->sig);
if (err)
return err;
/* FIXME-OLD #2:
*
* A receiving node MUST apply all local acked and unacked changes
* except unacked fee changes to the local commitment, then it MUST
* check `sig` is valid for that transaction.
*/
if (ci->sig && !check_tx_sig(ci->tx, 0,
NULL,
peer->anchor.witnessscript,
&peer->remote.commitkey,
ci->sig)) {
db_abort_transaction(peer);
return pkt_err(peer, "Bad signature");
}
/* Switch to the new commitment. */
tal_free(peer->local.commit);
peer->local.commit = ci;
peer->local.commit->order = peer->order_counter++;
db_new_commit_info(peer, LOCAL, NULL);
peer_get_revocation_hash(peer, ci->commit_num + 1,
&peer->local.next_revocation_hash);
peer->their_commitsigs++;
/* Now, send the revocation. */
/* We have their signature on the current one, right? */
assert(to_them_only || peer->local.commit->sig);
assert(peer->local.commit->commit_num > 0);
errmsg = changestates(peer,
revocation_changes, ARRAY_SIZE(revocation_changes),
revocation_feechanges,
ARRAY_SIZE(revocation_feechanges),
true);
if (errmsg) {
log_broken(peer->log, "queue_pkt_revocation: %s", errmsg);
db_abort_transaction(peer);
return pkt_err(peer, "Database error");
}
peer_get_revocation_preimage(peer, peer->local.commit->commit_num - 1,
&preimage);
/* Fire off timer if this ack caused new changes */
if (peer_uncommitted_changes(peer))
remote_changes_pending(peer);
queue_pkt_revocation(peer, &preimage, &peer->local.next_revocation_hash);
/* If we're shutting down and no more HTLCs, begin closing */
if (peer->closing.their_script && !committed_to_htlcs(peer))
start_closing_in_transaction(peer);
if (db_commit_transaction(peer) != NULL)
return pkt_err(peer, "Database error");
return NULL;
}
static Pkt *handle_pkt_htlc_add(struct peer *peer, const Pkt *pkt)
{
struct htlc *htlc;
Pkt *err;
err = accept_pkt_htlc_add(peer, pkt, &htlc);
if (err)
return err;
assert(htlc->state == RCVD_ADD_HTLC);
/* FIXME-OLD #2:
*
* A node MUST NOT offer `amount_msat` it cannot pay for in
* the remote commitment transaction at the current `fee_rate` (see
* "Fee Calculation" ). A node SHOULD fail the connection if
* this occurs.
*/
if (!cstate_add_htlc(peer->local.staging_cstate, htlc, true)) {
u64 id = htlc->id;
log_broken_struct(peer->log, "They cannot afford htlc %s",
struct htlc, htlc);
log_add_struct(peer->log, " cstate %s",
struct channel_state,
peer->local.staging_cstate);
tal_free(htlc);
return pkt_err(peer, "Cannot afford htlc %"PRIu64, id);
}
return NULL;
}
static Pkt *handle_pkt_htlc_fail(struct peer *peer, const Pkt *pkt)
{
struct htlc *htlc;
u8 *fail;
Pkt *err;
err = accept_pkt_htlc_fail(peer, pkt, &htlc, &fail);
if (err)
return err;
/* This can happen with re-transmissions; simply note it. */
if (htlc->fail) {
log_debug(peer->log, "HTLC %"PRIu64" failed twice", htlc->id);
htlc->fail = tal_free(htlc->fail);
}
db_start_transaction(peer);
set_htlc_fail(peer, htlc, fail, tal_count(fail));
tal_free(fail);
if (db_commit_transaction(peer) != NULL)
return pkt_err(peer, "database error");
cstate_fail_htlc(peer->local.staging_cstate, htlc);
/* FIXME-OLD #2:
*
* ... and the receiving node MUST add the HTLC fulfill/fail
* to the unacked changeset for its local commitment.
*/
htlc_changestate(htlc, SENT_ADD_ACK_REVOCATION, RCVD_REMOVE_HTLC, false);
return NULL;
}
static Pkt *handle_pkt_htlc_fulfill(struct peer *peer, const Pkt *pkt)
{
struct htlc *htlc;
Pkt *err;
struct preimage r;
err = accept_pkt_htlc_fulfill(peer, pkt, &htlc, &r);
if (err)
return err;
/* Reconnect may mean HTLC was already fulfilled. That's OK. */
if (!htlc->r) {
db_start_transaction(peer);
set_htlc_rval(peer, htlc, &r);
/* We can relay this upstream immediately. */
our_htlc_fulfilled(peer, htlc);
if (db_commit_transaction(peer) != NULL)
return pkt_err(peer, "database error");
}
/* FIXME-OLD #2:
*
* ... and the receiving node MUST add the HTLC fulfill/fail
* to the unacked changeset for its local commitment.
*/
cstate_fulfill_htlc(peer->local.staging_cstate, htlc);
htlc_changestate(htlc, SENT_ADD_ACK_REVOCATION, RCVD_REMOVE_HTLC, false);
return NULL;
}
static void set_feechange(struct peer *peer, u64 fee_rate,
enum feechange_state state)
{
/* If we already have a feechange for this commit, simply update it. */
if (peer->feechanges[state]) {
log_debug(peer->log, "Feechange: fee %"PRIu64" to %"PRIu64,
peer->feechanges[state]->fee_rate,
fee_rate);
peer->feechanges[state]->fee_rate = fee_rate;
} else {
log_debug(peer->log, "Feechange: New fee %"PRIu64, fee_rate);
peer->feechanges[state] = new_feechange(peer, fee_rate, state);
}
}
static Pkt *handle_pkt_feechange(struct peer *peer, const Pkt *pkt)
{
u64 feerate;
Pkt *err;
err = accept_pkt_update_fee(peer, pkt, &feerate);
if (err)
return err;
/* FIXME-OLD #2:
*
* The sending node MUST NOT send a `fee_rate` which it could not
* afford (see "Fee Calculation), were it applied to the receiving
* node's commitment transaction. The receiving node SHOULD fail the
* connection if this occurs.
*/
if (!can_afford_feerate(peer->local.staging_cstate, feerate, REMOTE))
return pkt_err(peer, "Cannot afford feerate %"PRIu64,
feerate);
set_feechange(peer, feerate, RCVD_FEECHANGE);
return NULL;
}
static Pkt *handle_pkt_revocation(struct peer *peer, const Pkt *pkt,
enum state next_state)
{
Pkt *err;
const char *errmsg;
static const struct htlcs_table changes[] = {
{ SENT_ADD_COMMIT, RCVD_ADD_REVOCATION },
{ SENT_REMOVE_ACK_COMMIT, RCVD_REMOVE_ACK_REVOCATION },
{ SENT_ADD_ACK_COMMIT, RCVD_ADD_ACK_REVOCATION },
{ SENT_REMOVE_COMMIT, RCVD_REMOVE_REVOCATION }
};
static const struct feechanges_table feechanges[] = {
{ SENT_FEECHANGE_COMMIT, RCVD_FEECHANGE_REVOCATION },
{ SENT_FEECHANGE_ACK_COMMIT, RCVD_FEECHANGE_ACK_REVOCATION }
};
err = accept_pkt_revocation(peer, pkt);
if (err)
return err;
/* FIXME-OLD #2:
*
* The receiver of `update_revocation`... MUST add the remote
* unacked changes to the set of local acked changes.
*/
db_start_transaction(peer);
errmsg = changestates(peer, changes, ARRAY_SIZE(changes),
feechanges, ARRAY_SIZE(feechanges), true);
if (errmsg) {
log_broken(peer->log, "accept_pkt_revocation: %s", errmsg);
db_abort_transaction(peer);
return pkt_err(peer, "failure accepting update_revocation: %s",
errmsg);
}
db_save_shachain(peer);
db_update_next_revocation_hash(peer);
set_peer_state(peer, next_state, __func__, true);
db_remove_their_prev_revocation_hash(peer);
/* If we're shutting down and no more HTLCs, begin closing */
if (peer->closing.their_script && !committed_to_htlcs(peer))
start_closing_in_transaction(peer);
if (db_commit_transaction(peer) != NULL)
return pkt_err(peer, "database error");
return NULL;
}
/* This is the io loop while we're doing shutdown. */
static bool shutdown_pkt_in(struct peer *peer, const Pkt *pkt)
{
Pkt *err = NULL;
assert(peer->state == STATE_SHUTDOWN
|| peer->state == STATE_SHUTDOWN_COMMITTING);
switch (pkt->pkt_case) {
case PKT__PKT_UPDATE_REVOCATION:
if (peer->state == STATE_SHUTDOWN)
return peer_received_unexpected_pkt(peer, pkt, __func__);
else {
err = handle_pkt_revocation(peer, pkt, STATE_SHUTDOWN);
if (!err)
peer_update_complete(peer);
}
break;
case PKT__PKT_UPDATE_ADD_HTLC:
/* FIXME-OLD #2:
*
* A node MUST NOT send a `update_add_htlc` after a
* `close_shutdown` */
if (peer->closing.their_script)
err = pkt_err(peer, "Update during shutdown");
else
err = handle_pkt_htlc_add(peer, pkt);
break;
case PKT__PKT_CLOSE_SHUTDOWN:
/* FIXME-OLD #2:
*
* A node... MUST NOT send more than one `close_shutdown`. */
if (peer->closing.their_script)
return peer_received_unexpected_pkt(peer, pkt, __func__);
else {
err = accept_pkt_close_shutdown(peer, pkt);
if (!err) {
db_start_transaction(peer);
db_set_their_closing_script(peer);
/* If no more HTLCs, we're closing. */
if (!committed_to_htlcs(peer))
start_closing_in_transaction(peer);
if (db_commit_transaction(peer) != NULL)
err = pkt_err(peer, "database error");
}
}
break;
case PKT__PKT_UPDATE_FULFILL_HTLC:
err = handle_pkt_htlc_fulfill(peer, pkt);
break;
case PKT__PKT_UPDATE_FAIL_HTLC:
err = handle_pkt_htlc_fail(peer, pkt);
break;
case PKT__PKT_UPDATE_FEE:
err = handle_pkt_feechange(peer, pkt);
break;
case PKT__PKT_UPDATE_COMMIT:
err = handle_pkt_commit(peer, pkt);
break;
case PKT__PKT_ERROR:
return peer_received_unexpected_pkt(peer, pkt, __func__);
case PKT__PKT_AUTH:
case PKT__PKT_OPEN:
case PKT__PKT_OPEN_ANCHOR:
case PKT__PKT_OPEN_COMMIT_SIG:
case PKT__PKT_OPEN_COMPLETE:
case PKT__PKT_CLOSE_SIGNATURE:
default:
return peer_received_unexpected_pkt(peer, pkt, __func__);
}
if (err)
return peer_comms_err(peer, err);
return true;
}
static bool do_commit(struct peer *peer, struct command *jsoncmd)
{
struct commit_info *ci;
const char *errmsg;
static const struct htlcs_table changes[] = {
{ SENT_ADD_HTLC, SENT_ADD_COMMIT },
{ SENT_REMOVE_REVOCATION, SENT_REMOVE_ACK_COMMIT },
{ SENT_ADD_REVOCATION, SENT_ADD_ACK_COMMIT},
{ SENT_REMOVE_HTLC, SENT_REMOVE_COMMIT}
};
static const struct feechanges_table feechanges[] = {
{ SENT_FEECHANGE, SENT_FEECHANGE_COMMIT },
{ SENT_FEECHANGE_REVOCATION, SENT_FEECHANGE_ACK_COMMIT}
};
bool to_us_only;
/* We can have changes we suggested, or changes they suggested. */
if (!peer_uncommitted_changes(peer)) {
log_debug(peer->log, "do_commit: no changes to commit");
if (jsoncmd)
command_fail(jsoncmd, "no changes to commit");
return true;
}
log_debug(peer->log, "do_commit: sending commit command %"PRIu64,
peer->remote.commit->commit_num + 1);
assert(state_can_commit(peer->state));
assert(!peer->commit_jsoncmd);
peer->commit_jsoncmd = jsoncmd;
ci = new_commit_info(peer, peer->remote.commit->commit_num + 1);
assert(!peer->their_prev_revocation_hash);
peer->their_prev_revocation_hash
= tal_dup(peer, struct sha256,
&peer->remote.commit->revocation_hash);
db_start_transaction(peer);
errmsg = changestates(peer, changes, ARRAY_SIZE(changes),
feechanges, ARRAY_SIZE(feechanges), true);
if (errmsg) {
log_broken(peer->log, "queue_pkt_commit: %s", errmsg);
goto database_error;
}
/* Create new commit info for this commit tx. */
ci->revocation_hash = peer->remote.next_revocation_hash;
/* FIXME-OLD #2:
*
* ...a sending node MUST apply all remote acked and unacked
* changes except unacked fee changes to the remote commitment
* before generating `sig`. */
ci->cstate = copy_cstate(ci, peer->remote.staging_cstate);
ci->tx = create_commit_tx(ci, peer, &ci->revocation_hash,
ci->cstate, REMOTE, &to_us_only);
bitcoin_txid(ci->tx, &ci->txid);
if (!to_us_only) {
log_debug(peer->log, "Signing tx %"PRIu64, ci->commit_num);
log_add_struct(peer->log, " for %s",
struct channel_state, ci->cstate);
log_add_struct(peer->log, " (txid %s)",
struct sha256_double, &ci->txid);
ci->sig = tal(ci, secp256k1_ecdsa_signature);
peer_sign_theircommit(peer, ci->tx, ci->sig);
}
/* Switch to the new commitment. */
tal_free(peer->remote.commit);
peer->remote.commit = ci;
peer->remote.commit->order = peer->order_counter++;
db_new_commit_info(peer, REMOTE, peer->their_prev_revocation_hash);
/* We don't need to remember their commit if we don't give sig. */
if (ci->sig)
peer_add_their_commit(peer, &ci->txid, ci->commit_num);
if (peer->state == STATE_SHUTDOWN) {
set_peer_state(peer, STATE_SHUTDOWN_COMMITTING, __func__, true);
} else {
assert(peer->state == STATE_NORMAL);
set_peer_state(peer, STATE_NORMAL_COMMITTING, __func__, true);
}
if (db_commit_transaction(peer) != NULL)
goto database_error;
queue_pkt_commit(peer, ci->sig);
return true;
database_error:
db_abort_transaction(peer);
peer_fail(peer, __func__);
return false;
}
static bool peer_start_shutdown(struct peer *peer)
{
enum state newstate;
u8 *redeemscript;
/* We might have uncommited changes; if so, commit them now. */
if (!do_commit(peer, NULL))
return false;
db_start_transaction(peer);
db_begin_shutdown(peer);
/* If they started close, we might not have sent ours. */
assert(!peer->closing.our_script);
redeemscript = bitcoin_redeem_single(peer, &peer->local.finalkey);
peer->closing.our_script = scriptpubkey_p2sh(peer, redeemscript);
tal_free(redeemscript);
/* FIXME-OLD #2:
*
* A node SHOULD send a `close_shutdown` (if it has
* not already) after receiving `close_shutdown`.
*/
peer->closing.shutdown_order = peer->order_counter++;
db_set_our_closing_script(peer);
queue_pkt_close_shutdown(peer);
if (peer->state == STATE_NORMAL_COMMITTING) {
newstate = STATE_SHUTDOWN_COMMITTING;
} else {
newstate = STATE_SHUTDOWN;
}
set_peer_state(peer, newstate, __func__, true);
/* Catch case where we've exchanged and had no HTLCs anyway. */
if (peer->closing.their_script && !committed_to_htlcs(peer))
start_closing_in_transaction(peer);
return db_commit_transaction(peer) == NULL;
}
/* Shim to handle the new packet format until we complete the
* switch. Handing the protobuf in anyway to fall back on protobuf
* based error handling. */
static bool nested_pkt_in(struct peer *peer, const u32 type,
const u8 *innerpkt, size_t innerpktlen,
const Pkt *pkt)
{
switch (type) {
case WIRE_CHANNEL_ANNOUNCEMENT:
handle_channel_announcement(peer->dstate->rstate, innerpkt, innerpktlen);
break;
case WIRE_CHANNEL_UPDATE:
handle_channel_update(peer->dstate->rstate, innerpkt, innerpktlen);
break;
case WIRE_NODE_ANNOUNCEMENT:
handle_node_announcement(peer->dstate->rstate, innerpkt, innerpktlen);
break;
default:
/* BOLT01: Unknown even typed packets MUST kill the
connection, unknown odd-typed packets MAY be ignored. */
if (type % 2 == 0){
return peer_received_unexpected_pkt(peer, pkt, __func__);
} else {
log_debug(peer->log, "Ignoring odd typed (%d) unknown packet.", type);
return true;
}
}
return true;
}
/* This is the io loop while we're in normal mode. */
static bool normal_pkt_in(struct peer *peer, const Pkt *pkt)
{
Pkt *err = NULL;
assert(peer->state == STATE_NORMAL
|| peer->state == STATE_NORMAL_COMMITTING);
switch (pkt->pkt_case) {
case PKT__PKT_UPDATE_ADD_HTLC:
err = handle_pkt_htlc_add(peer, pkt);
break;
case PKT__PKT_UPDATE_FULFILL_HTLC:
err = handle_pkt_htlc_fulfill(peer, pkt);
break;
case PKT__PKT_UPDATE_FAIL_HTLC:
err = handle_pkt_htlc_fail(peer, pkt);
break;
case PKT__PKT_UPDATE_FEE:
err = handle_pkt_feechange(peer, pkt);
break;
case PKT__PKT_UPDATE_COMMIT:
err = handle_pkt_commit(peer, pkt);
break;
case PKT__PKT_CLOSE_SHUTDOWN:
err = accept_pkt_close_shutdown(peer, pkt);
if (err)
break;
if (!peer_start_shutdown(peer)) {
err = pkt_err(peer, "database error");
break;
}
return true;
case PKT__PKT_UPDATE_REVOCATION:
if (peer->state == STATE_NORMAL_COMMITTING) {
err = handle_pkt_revocation(peer, pkt, STATE_NORMAL);
if (!err)
peer_update_complete(peer);
break;
}
/* Fall thru. */
default:
return peer_received_unexpected_pkt(peer, pkt, __func__);
}
if (err) {
return peer_comms_err(peer, err);
}
return true;
}
/* Create a HTLC fulfill transaction for onchain.tx[out_num]. */
static const struct bitcoin_tx *htlc_fulfill_tx(const struct peer *peer,
unsigned int out_num)
{
struct bitcoin_tx *tx = bitcoin_tx(peer, 1, 1);
const struct htlc *htlc = peer->onchain.htlcs[out_num];
const u8 *wscript = peer->onchain.wscripts[out_num];
secp256k1_ecdsa_signature sig;
u64 fee, satoshis;
assert(htlc->r);
tx->input[0].index = out_num;
tx->input[0].txid = peer->onchain.txid;
satoshis = htlc->msatoshi / 1000;
tx->input[0].amount = tal_dup(tx->input, u64, &satoshis);
tx->input[0].sequence_number = bitcoin_nsequence(&peer->remote.locktime);
/* Using a new output address here would be useless: they can tell
* it's their HTLC, and that we collected it via rval. */
tx->output[0].script = scriptpubkey_p2sh(tx,
bitcoin_redeem_single(tx,
&peer->local.finalkey));
log_debug(peer->log, "Pre-witness txlen = %zu\n",
measure_tx_cost(tx) / 4);
assert(measure_tx_cost(tx) == 83 * 4);
/* Witness length can vary, due to DER encoding of sigs, but we
* use 539 from an example run. */
fee = fee_by_feerate(83 + 539 / 4, get_feerate(peer->dstate->topology));
/* FIXME: Fail gracefully in these cases (not worth collecting) */
if (fee > satoshis || is_dust(satoshis - fee))
fatal("HTLC fulfill amount of %"PRIu64" won't cover fee %"PRIu64,
satoshis, fee);
tx->output[0].amount = satoshis - fee;
peer_sign_htlc_fulfill(peer, tx, wscript, &sig);
tx->input[0].witness = bitcoin_witness_htlc(tx,
htlc->r, &sig, wscript);
log_debug(peer->log, "tx cost for htlc fulfill tx: %zu",
measure_tx_cost(tx));
return tx;
}
static bool command_htlc_set_fail(struct peer *peer, struct htlc *htlc,
enum fail_error error_code, const char *why)
{
const u8 *fail = failinfo_create(htlc,
&peer->dstate->id, error_code, why);
set_htlc_fail(peer, htlc, fail, tal_count(fail));
tal_free(fail);
return command_htlc_fail(peer, htlc);
}
static bool command_htlc_fail(struct peer *peer, struct htlc *htlc)
{
/* If onchain, nothing we can do. */
if (!state_can_remove_htlc(peer->state))
return false;
/* FIXME-OLD #2:
*
* The sending node MUST add the HTLC fulfill/fail to the
* unacked changeset for its remote commitment
*/
cstate_fail_htlc(peer->remote.staging_cstate, htlc);
htlc_changestate(htlc, RCVD_ADD_ACK_REVOCATION, SENT_REMOVE_HTLC, false);
remote_changes_pending(peer);
queue_pkt_htlc_fail(peer, htlc);
return true;
}
/* FIXME-OLD #onchain:
*
* If the node receives... a redemption preimage for an unresolved *commitment
* tx* output it was offered, it MUST *resolve* the output by spending it using
* the preimage.
*/
static bool fulfill_onchain(struct peer *peer, struct htlc *htlc)
{
size_t i;
for (i = 0; i < tal_count(peer->onchain.htlcs); i++) {
if (peer->onchain.htlcs[i] == htlc) {
/* Already irrevocably resolved? */
if (peer->onchain.resolved[i])
return false;
peer->onchain.resolved[i]
= htlc_fulfill_tx(peer, i);
broadcast_tx(peer->dstate->topology,
peer, peer->onchain.resolved[i], NULL);
return true;
}
}
fatal("Unknown HTLC to fulfill onchain");
}
static bool command_htlc_fulfill(struct peer *peer, struct htlc *htlc)
{
if (peer->state == STATE_CLOSE_ONCHAIN_THEIR_UNILATERAL
|| peer->state == STATE_CLOSE_ONCHAIN_OUR_UNILATERAL) {
return fulfill_onchain(peer, htlc);
}
if (!state_can_remove_htlc(peer->state))
return false;
/* FIXME-OLD #2:
*
* The sending node MUST add the HTLC fulfill/fail to the
* unacked changeset for its remote commitment
*/
cstate_fulfill_htlc(peer->remote.staging_cstate, htlc);
htlc_changestate(htlc, RCVD_ADD_ACK_REVOCATION, SENT_REMOVE_HTLC, false);
remote_changes_pending(peer);
queue_pkt_htlc_fulfill(peer, htlc);
return true;
}
const char *command_htlc_add(struct peer *peer, u64 msatoshi,
unsigned int expiry,
const struct sha256 *rhash,
struct htlc *src,
const u8 *route,
u32 *error_code,
struct htlc **htlc)
{
struct abs_locktime locktime;
if (!blocks_to_abs_locktime(expiry, &locktime)) {
log_unusual(peer->log, "add_htlc: fail: bad expiry %u", expiry);
*error_code = BAD_REQUEST_400;
return "bad expiry";
}
if (expiry < get_block_height(peer->dstate->topology) + peer->dstate->config.min_htlc_expiry) {
log_unusual(peer->log, "add_htlc: fail: expiry %u is too soon",
expiry);
*error_code = BAD_REQUEST_400;
return "expiry too soon";
}
if (expiry > get_block_height(peer->dstate->topology) + peer->dstate->config.max_htlc_expiry) {
log_unusual(peer->log, "add_htlc: fail: expiry %u is too far",
expiry);
*error_code = BAD_REQUEST_400;
return "expiry too far";
}
/* FIXME-OLD #2:
*
* A node MUST NOT add a HTLC if it would result in it
* offering more than 300 HTLCs in the remote commitment transaction.
*/
if (peer->remote.staging_cstate->side[LOCAL].num_htlcs == 300) {
log_unusual(peer->log, "add_htlc: fail: already at limit");
*error_code = SERVICE_UNAVAILABLE_503;
return "channel full";
}
if (!state_can_add_htlc(peer->state)) {
log_unusual(peer->log, "add_htlc: fail: peer state %s",
state_name(peer->state));
*error_code = NOT_FOUND_404;
return "peer not available";
}
*htlc = peer_new_htlc(peer, peer->htlc_id_counter,
msatoshi, rhash, expiry, route, tal_count(route),
src, SENT_ADD_HTLC);
/* FIXME-OLD #2:
*
* The sending node MUST add the HTLC addition to the unacked
* changeset for its remote commitment
*/
if (!cstate_add_htlc(peer->remote.staging_cstate, *htlc, true)) {
/* FIXME-OLD #2:
*
* A node MUST NOT offer `amount_msat` it cannot pay for in
* the remote commitment transaction at the current `fee_rate`
*/
log_unusual(peer->log, "add_htlc: fail: Cannot afford %"PRIu64
" milli-satoshis in their commit tx",
msatoshi);
log_add_struct(peer->log, " channel state %s",
struct channel_state,
peer->remote.staging_cstate);
*htlc = tal_free(*htlc);
*error_code = SERVICE_UNAVAILABLE_503;
return "cannot afford htlc";
}
remote_changes_pending(peer);
queue_pkt_htlc_add(peer, *htlc);
/* Make sure we never offer the same one twice. */
peer->htlc_id_counter++;
return NULL;
}
static struct io_plan *pkt_out(struct io_conn *conn, struct peer *peer)
{
Pkt *out;
size_t n = tal_count(peer->outpkt);
if (n == 0) {
/* We close the connection once we've sent everything. */
if (!state_can_io(peer->state)) {
log_debug(peer->log, "pkt_out: no IO possible, closing");
return io_close(conn);
}
return io_out_wait(conn, peer, pkt_out, peer);
}
if (peer->fake_close || !peer->output_enabled)
return io_out_wait(conn, peer, pkt_out, peer);
out = peer->outpkt[0];
memmove(peer->outpkt, peer->outpkt + 1, (sizeof(*peer->outpkt)*(n-1)));
tal_resize(&peer->outpkt, n-1);
log_debug(peer->log, "pkt_out: writing %s", pkt_name(out->pkt_case));
return peer_write_packet(conn, peer, out, pkt_out);
}
static void clear_output_queue(struct peer *peer)
{
size_t i, n = tal_count(peer->outpkt);
for (i = 0; i < n; i++)
tal_free(peer->outpkt[i]);
tal_resize(&peer->outpkt, 0);
}
static struct io_plan *pkt_in(struct io_conn *conn, struct peer *peer)
{
bool keep_going = true;
/* We ignore packets if they tell us to, or we're closing already */
if (peer->fake_close || !state_can_io(peer->state))
keep_going = true;
/* Sidestep the state machine for nested packets */
else if (peer->inpkt->pkt_case == PKT__PKT_NESTED)
keep_going = nested_pkt_in(peer, peer->inpkt->nested->type,
peer->inpkt->nested->inner_pkt.data,
peer->inpkt->nested->inner_pkt.len,
peer->inpkt);
else if (state_is_normal(peer->state))
keep_going = normal_pkt_in(peer, peer->inpkt);
else if (state_is_shutdown(peer->state))
keep_going = shutdown_pkt_in(peer, peer->inpkt);
else if (peer->state == STATE_MUTUAL_CLOSING)
keep_going = closing_pkt_in(peer, peer->inpkt);
else if (peer->state == STATE_OPEN_WAIT_FOR_OPENPKT)
keep_going = open_pkt_in(peer, peer->inpkt);
else if (peer->state == STATE_OPEN_WAIT_FOR_COMMIT_SIGPKT)
keep_going = open_ouranchor_pkt_in(peer, peer->inpkt);
else if (peer->state == STATE_OPEN_WAIT_FOR_ANCHORPKT)
keep_going = open_theiranchor_pkt_in(peer, peer->inpkt);
else if (state_is_openwait(peer->state))
keep_going = open_wait_pkt_in(peer, peer->inpkt);
else {
log_unusual(peer->log,
"Unexpected state %s", state_name(peer->state));
keep_going = false;
}
peer->inpkt = tal_free(peer->inpkt);
if (keep_going)
return peer_read_packet(conn, peer, pkt_in);
else
return peer_close(conn, peer);
}
/*
* This only works because we send one update at a time, and they can't
* ask for it again if they've already sent the `update_revocation` acking it.
*/
static void retransmit_updates(struct peer *peer)
{
struct htlc_map_iter it;
struct htlc *h;
/* FIXME-OLD #2:
*
* A node MAY simply retransmit messages which are identical to the
* previous transmission. */
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
switch (h->state) {
case SENT_ADD_COMMIT:
log_debug(peer->log, "Retransmitting add HTLC %"PRIu64,
h->id);
queue_pkt_htlc_add(peer, h);
break;
case SENT_REMOVE_COMMIT:
log_debug(peer->log, "Retransmitting %s HTLC %"PRIu64,
h->r ? "fulfill" : "fail", h->id);
if (h->r)
queue_pkt_htlc_fulfill(peer, h);
else
queue_pkt_htlc_fail(peer, h);
break;
default:
break;
}
}
assert(!peer->feechanges[SENT_FEECHANGE]);
}
/* FIXME-OLD #2:
*
* On disconnection, a node MUST reverse any uncommitted changes sent by the
* other side (ie. `update_add_htlc`, `update_fee`, `update_fail_htlc` and
* `update_fulfill_htlc` for which no `update_commit` has been received). A
* node SHOULD retain the `r` value from the `update_fulfill_htlc`, however.
*/
static void forget_uncommitted_changes(struct peer *peer)
{
struct htlc *h;
struct htlc_map_iter it;
bool retry;
if (!peer->remote.commit || !peer->remote.commit->cstate)
return;
log_debug(peer->log, "Forgetting uncommitted");
log_debug_struct(peer->log, "LOCAL: changing from %s",
struct channel_state, peer->local.staging_cstate);
log_add_struct(peer->log, " to %s",
struct channel_state, peer->local.commit->cstate);
log_debug_struct(peer->log, "REMOTE: changing from %s",
struct channel_state, peer->remote.staging_cstate);
log_add_struct(peer->log, " to %s",
struct channel_state, peer->remote.commit->cstate);
tal_free(peer->local.staging_cstate);
tal_free(peer->remote.staging_cstate);
peer->local.staging_cstate
= copy_cstate(peer, peer->local.commit->cstate);
peer->remote.staging_cstate
= copy_cstate(peer, peer->remote.commit->cstate);
/* We forget everything we're routing, and re-send. This
* works for the reload-from-database case as well as the
* normal reconnect. */
again:
retry = false;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
switch (h->state) {
case SENT_ADD_HTLC:
/* Adjust counter to lowest HTLC removed */
if (peer->htlc_id_counter > h->id) {
log_debug(peer->log,
"Lowering htlc_id_counter to %"PRIu64,
h->id);
peer->htlc_id_counter = h->id;
}
/* Fall thru */
case RCVD_ADD_HTLC:
log_debug(peer->log, "Forgetting %s %"PRIu64,
htlc_state_name(h->state), h->id);
/* May miss some due to delete reorg. */
tal_free(h);
retry = true;
break;
case RCVD_REMOVE_HTLC:
log_debug(peer->log, "Undoing %s %"PRIu64,
htlc_state_name(h->state), h->id);
htlc_undostate(h, RCVD_REMOVE_HTLC,
SENT_ADD_ACK_REVOCATION);
break;
case SENT_REMOVE_HTLC:
log_debug(peer->log, "Undoing %s %"PRIu64,
htlc_state_name(h->state), h->id);
htlc_undostate(h, SENT_REMOVE_HTLC,
RCVD_ADD_ACK_REVOCATION);
break;
default:
break;
}
}
if (retry)
goto again;
/* Forget uncommitted feechanges */
peer->feechanges[SENT_FEECHANGE]
= tal_free(peer->feechanges[SENT_FEECHANGE]);
peer->feechanges[RCVD_FEECHANGE]
= tal_free(peer->feechanges[RCVD_FEECHANGE]);
/* Make sure our HTLC counter is correct. */
if (peer->htlc_id_counter != 0)
assert(htlc_get(&peer->htlcs, peer->htlc_id_counter-1, LOCAL));
assert(!htlc_get(&peer->htlcs, peer->htlc_id_counter, LOCAL));
}
static void retransmit_pkts(struct peer *peer, s64 ack)
{
log_debug(peer->log, "Our order counter is %"PRIi64", their ack %"PRIi64,
peer->order_counter, ack);
if (ack > peer->order_counter) {
log_unusual(peer->log, "reconnect ack %"PRIi64" > %"PRIi64,
ack, peer->order_counter);
peer_comms_err(peer, pkt_err(peer, "invalid ack"));
return;
}
log_debug(peer->log, "They acked %"PRIi64", remote=%"PRIi64" local=%"PRIi64,
ack, peer->remote.commit ? peer->remote.commit->order : -2,
peer->local.commit ? peer->local.commit->order : -2);
/* FIXME-OLD #2:
*
* A node MAY assume that only one of each type of message need be
* retransmitted. A node SHOULD retransmit the last of each message
* type which was not counted by the `ack` field.
*/
while (ack < peer->order_counter) {
if (ack == 0) {
queue_pkt_open(peer, peer->local.offer_anchor);
} else if (ack == 1) {
queue_pkt_open_commit_sig(peer);
} else if (peer->remote.commit
&& ack == peer->remote.commit->order) {
/* FIXME-OLD #2:
*
* Before retransmitting `update_commit`, the node
* MUST send appropriate `update_add_htlc`,
* `update_fee`, `update_fail_htlc` or
* `update_fulfill_htlc` messages (the other node will
* have forgotten them, as required above).
*/
retransmit_updates(peer);
queue_pkt_commit(peer, peer->remote.commit->sig);
} else if (peer->local.commit
&& ack == peer->local.commit->order) {
/* Re-transmit revocation. */
struct sha256 preimage, next;
u64 commit_num = peer->local.commit->commit_num - 1;
/* Make sure we don't revoke current commit! */
assert(commit_num < peer->local.commit->commit_num);
peer_get_revocation_preimage(peer, commit_num,&preimage);
peer_get_revocation_hash(peer, commit_num + 2, &next);
log_debug(peer->log, "Re-sending revocation hash %"PRIu64,
commit_num + 2);
log_add_struct(peer->log, "value %s", struct sha256,
&next);
log_add_struct(peer->log, "local.next=%s", struct sha256,
&peer->local.next_revocation_hash);
log_debug(peer->log, "Re-sending revocation %"PRIu64,
commit_num);
queue_pkt_revocation(peer, &preimage, &next);
} else if (ack == peer->closing.shutdown_order) {
log_debug(peer->log, "Re-sending shutdown");
queue_pkt_close_shutdown(peer);
} else if (ack == peer->closing.closing_order) {
log_debug(peer->log, "Re-sending closing order");
queue_pkt_close_signature(peer);
} else {
log_broken(peer->log, "Can't rexmit %"PRIu64
" when local commit %"PRIi64" and remote %"PRIi64,
ack,
peer->local.commit ? peer->local.commit->order : -2,
peer->remote.commit ? peer->remote.commit->order : -2);
peer_comms_err(peer, pkt_err(peer, "invalid ack"));
return;
}
ack++;
}
/* We might need to update HTLCs which were from other peers. */
retry_all_routing(peer);
}
static u64 desired_commit_feerate(struct lightningd_state *dstate)
{
return get_feerate(dstate->topology) * dstate->config.commitment_fee_percent / 100;
}
static bool want_feechange(const struct peer *peer)
{
if (!state_is_normal(peer->state) && !state_is_shutdown(peer->state))
return false;
log_debug(peer->log, "Current fee_rate: %"PRIu64" want %"PRIu64,
peer->local.staging_cstate->fee_rate,
desired_commit_feerate(peer->dstate));
/* FIXME: Send fee changes when we want it */
return false;
}
static void peer_has_connected(struct peer *peer)
{
assert(!peer->connected);
peer->connected = true;
/* Do we want to send something? */
if (peer_uncommitted_changes(peer) || want_feechange(peer)) {
log_debug(peer->log, "connected: changes pending");
remote_changes_pending(peer);
}
}
static struct io_plan *init_pkt_in(struct io_conn *conn, struct peer *peer)
{
if (peer->inpkt->pkt_case != PKT__PKT_INIT) {
peer_received_unexpected_pkt(peer, peer->inpkt, __func__);
goto fail;
}
/* They might have missed the error, tell them before hanging up */
if (state_is_error(peer->state)) {
queue_pkt_err(peer, pkt_err(peer, "In error state %s",
state_name(peer->state)));
goto fail;
}
/* We might have had an onchain event while handshaking! */
if (!state_can_io(peer->state))
goto fail;
if (peer->inpkt->init->has_features) {
size_t i;
/* FIXME-OLD #2:
*
* The receiving node SHOULD ignore any odd feature bits it
* does not support, and MUST fail the connection if any
* unsupported even `features` bit is set. */
for (i = 0; i < peer->inpkt->init->features.len*CHAR_BIT; i++) {
size_t byte = i / CHAR_BIT, bit = i % CHAR_BIT;
if (peer->inpkt->init->features.data[byte] & (1<<bit)) {
/* Can't handle even features. */
if (i % 2 != 0) {
log_debug(peer->log,
"They offered feature %zu", i);
continue;
}
queue_pkt_err(peer,
pkt_err(peer,
"Unsupported feature %zu",
i));
goto fail;
}
}
}
/* Send any packets they missed. */
retransmit_pkts(peer, peer->inpkt->init->ack);
/* We let the conversation go this far in case they missed the
* close packets. But now we can close if we're done. */
if (!state_can_io(peer->state)) {
log_debug(peer->log, "State %s, closing immediately",
state_name(peer->state));
goto fail;
}
/* Back into normal mode. */
peer->inpkt = tal_free(peer->inpkt);
peer_has_connected(peer);
if (state_is_normal(peer->state)){
announce_channel(peer->dstate, peer);
sync_routing_table(peer->dstate, peer);
}
return io_duplex(conn,
peer_read_packet(conn, peer, pkt_in),
pkt_out(conn, peer));
fail:
/* We always free inpkt; they may yet reconnect. */
peer->inpkt = tal_free(peer->inpkt);
return pkt_out(conn, peer);
}
static struct io_plan *read_init_pkt(struct io_conn *conn,
struct peer *peer)
{
return peer_read_packet(conn, peer, init_pkt_in);
}
static u64 peer_commitsigs_received(struct peer *peer)
{
return peer->their_commitsigs;
}
static u64 peer_revocations_received(struct peer *peer)
{
/* How many preimages we've received. */
return -peer->their_preimages.min_index;
}
static struct io_plan *peer_send_init(struct io_conn *conn, struct peer *peer)
{
u64 open, sigs, revokes, shutdown, closing;
open = (peer->state == STATE_OPEN_WAIT_FOR_OPENPKT ? 0 : 1);
sigs = peer_commitsigs_received(peer);
revokes = peer_revocations_received(peer);
shutdown = peer->closing.their_script ? 1 : 0;
closing = peer->closing.sigs_in;
log_debug(peer->log,
"Init with ack %"PRIu64" opens + %"PRIu64" sigs + %"
PRIu64" revokes + %"PRIu64" shutdown + %"PRIu64" closing",
open, sigs, revokes, shutdown, closing);
/* FIXME-OLD #2:
*
* A node MUST send an `init` message immediately immediately after
* it has validated the `authenticate` message. A node MUST set
* the `ack` field in the `init` message to the the sum of
* previously-processed messages of types `open`, `open_commit_sig`,
* `update_commit`, `update_revocation`, `close_shutdown` and
* `close_signature`. */
return peer_write_packet(conn, peer,
pkt_init(peer, open + sigs + revokes
+ shutdown + closing),
read_init_pkt);
}
/* Crypto is on, we are live. */
static struct io_plan *peer_crypto_on(struct io_conn *conn, struct peer *peer)
{
peer_secrets_init(peer);
peer_get_revocation_hash(peer, 0, &peer->local.next_revocation_hash);
assert(peer->state == STATE_INIT);
/* Counter is 1 for sending pkt_open: we'll do it in retransmit_pkts */
peer->order_counter++;
db_start_transaction(peer);
set_peer_state(peer, STATE_OPEN_WAIT_FOR_OPENPKT, __func__, true);
/* FIXME: Start timeout, and close peer if they don't progress! */
db_create_peer(peer);
if (db_commit_transaction(peer) != NULL) {
peer_database_err(peer);
return peer_close(conn, peer);
}
/* Set up out commit info now: rest gets done in setup_first_commit
* once anchor is established. */
peer->local.commit = new_commit_info(peer, 0);
peer->local.commit->revocation_hash = peer->local.next_revocation_hash;
peer_get_revocation_hash(peer, 1, &peer->local.next_revocation_hash);
return peer_send_init(conn,peer);
}
static void destroy_peer(struct peer *peer)
{
if (peer->conn)
io_close(peer->conn);
list_del_from(&peer->dstate->peers, &peer->list);
}
static void try_reconnect(struct peer *peer);
static void peer_disconnect(struct io_conn *conn, struct peer *peer)
{
log_info(peer->log, "Disconnected");
/* No longer connected. */
peer->conn = NULL;
peer->connected = false;
/* Not even set up yet? Simply free.*/
if (peer->state == STATE_INIT) {
/* This means we didn't get past crypto handshake or hit db */
tal_free(peer);
return;
}
/* Completely dead? Free it now. */
if (peer->state == STATE_CLOSED) {
io_break(peer);
return;
}
/* This is an unexpected close. */
if (state_can_io(peer->state)) {
forget_uncommitted_changes(peer);
try_reconnect(peer);
}
}
static void try_commit(struct peer *peer)
{
peer->commit_timer = NULL;
if (!peer->connected) {
log_debug(peer->log, "try_commit: state=%s, not connected",
state_name(peer->state));
return;
}
if (state_can_commit(peer->state))
do_commit(peer, NULL);
else {
/* FIXME: try again when we receive revocation /
* reconnect, rather than using timer! */
log_debug(peer->log, "try_commit: state=%s, re-queueing timer",
state_name(peer->state));
remote_changes_pending(peer);
}
}
struct commit_info *new_commit_info(const tal_t *ctx, u64 commit_num)
{
struct commit_info *ci = tal(ctx, struct commit_info);
ci->commit_num = commit_num;
ci->tx = NULL;
ci->cstate = NULL;
ci->sig = NULL;
ci->order = (s64)-1LL;
return ci;
}
static bool peer_reconnected(struct peer *peer,
struct io_conn *conn,
int addr_type, int addr_protocol,
struct io_data *iod,
const struct pubkey *id,
bool we_connected)
{
char *name;
struct netaddr addr;
assert(structeq(peer->id, id));
peer->io_data = tal_steal(peer, iod);
/* FIXME: Attach IO logging for this peer. */
if (!netaddr_from_fd(io_conn_fd(conn), addr_type, addr_protocol, &addr))
return false;
/* If we free peer, conn should be closed, but can't be freed
* immediately so don't make peer a parent. */
peer->conn = conn;
io_set_finish(conn, peer_disconnect, peer);
name = netaddr_name(peer, &addr);
log_info(peer->log, "Reconnected %s %s",
we_connected ? "out to" : "in from", name);
tal_free(name);
return true;
}
struct peer *new_peer(struct lightningd_state *dstate,
struct log *log,
enum state state,
bool offer_anchor)
{
struct peer *peer = tal(dstate, struct peer);
peer->state = state;
peer->connected = false;
peer->id = NULL;
peer->dstate = dstate;
peer->io_data = NULL;
peer->secrets = NULL;
list_head_init(&peer->watches);
peer->inpkt = NULL;
peer->outpkt = tal_arr(peer, Pkt *, 0);
peer->open_jsoncmd = NULL;
peer->commit_jsoncmd = NULL;
list_head_init(&peer->their_commits);
peer->anchor.ok_depth = -1;
peer->order_counter = 0;
peer->their_commitsigs = 0;
peer->cur_commit.watch = NULL;
peer->closing.their_sig = NULL;
peer->closing.our_script = NULL;
peer->closing.their_script = NULL;
peer->closing.shutdown_order = (s64)-1LL;
peer->closing.closing_order = (s64)-1LL;
peer->closing.sigs_in = 0;
peer->onchain.tx = NULL;
peer->onchain.resolved = NULL;
peer->onchain.htlcs = NULL;
peer->onchain.wscripts = NULL;
peer->commit_timer = NULL;
peer->nc = NULL;
peer->their_prev_revocation_hash = NULL;
peer->conn = NULL;
peer->fake_close = false;
peer->output_enabled = true;
peer->local.offer_anchor = offer_anchor;
peer->broadcast_index = 0;
if (!blocks_to_rel_locktime(dstate->config.locktime_blocks,
&peer->local.locktime))
fatal("Could not convert locktime_blocks");
peer->local.mindepth = dstate->config.anchor_confirms;
peer->local.commit = peer->remote.commit = NULL;
peer->local.staging_cstate = peer->remote.staging_cstate = NULL;
peer->log = tal_steal(peer, log);
log_debug(peer->log, "New peer %p", peer);
htlc_map_init(&peer->htlcs);
memset(peer->feechanges, 0, sizeof(peer->feechanges));
shachain_init(&peer->their_preimages);
list_add(&dstate->peers, &peer->list);
tal_add_destructor(peer, destroy_peer);
return peer;
}
static struct peer_address *find_address(struct lightningd_state *dstate,
const struct pubkey *id)
{
struct peer_address *i;
list_for_each(&dstate->addresses, i, list) {
if (structeq(&id->pubkey, &i->id.pubkey))
return i;
}
return NULL;
}
static bool add_peer_address(struct lightningd_state *dstate,
const struct pubkey *id,
const struct netaddr *addr)
{
struct peer_address *a = find_address(dstate, id);
if (a) {
a->addr = *addr;
} else {
a = tal(dstate, struct peer_address);
a->addr = *addr;
a->id = *id;
list_add_tail(&dstate->addresses, &a->list);
}
return db_add_peer_address(dstate, a);
}
static bool peer_first_connected(struct peer *peer,
struct io_conn *conn,
int addr_type, int addr_protocol,
struct io_data *iod,
const struct pubkey *id,
bool we_connected)
{
char *name, *idstr;
struct netaddr addr;
peer->io_data = tal_steal(peer, iod);
peer->id = tal_dup(peer, struct pubkey, id);
peer->local.commit_fee_rate = desired_commit_feerate(peer->dstate);
peer->htlc_id_counter = 0;
/* If we free peer, conn should be closed, but can't be freed
* immediately so don't make peer a parent. */
peer->conn = conn;
io_set_finish(conn, peer_disconnect, peer);
peer->anchor.min_depth = get_block_height(peer->dstate->topology);
/* FIXME: Attach IO logging for this peer. */
if (!netaddr_from_fd(io_conn_fd(conn), addr_type, addr_protocol, &addr))
return false;
/* Save/update address if we connected to them. */
if (we_connected && !add_peer_address(peer->dstate, peer->id, &addr))
return false;
name = netaddr_name(peer, &addr);
idstr = pubkey_to_hexstr(name, peer->id);
log_info(peer->log, "Connected %s %s id %s, changing prefix",
we_connected ? "out to" : "in from", name, idstr);
set_log_prefix(peer->log, tal_fmt(name, "%s:", idstr));
tal_free(name);
log_debug(peer->log, "Using fee rate %"PRIu64,
peer->local.commit_fee_rate);
return true;
}
static void htlc_destroy(struct htlc *htlc)
{
if (!htlc_map_del(&htlc->peer->htlcs, htlc))
fatal("Could not find htlc to destroy");
}
struct htlc *peer_new_htlc(struct peer *peer,
u64 id,
u64 msatoshi,
const struct sha256 *rhash,
u32 expiry,
const u8 *route,
size_t routelen,
struct htlc *src,
enum htlc_state state)
{
struct htlc *h = tal(peer, struct htlc);
h->peer = peer;
h->state = state;
h->id = id;
h->msatoshi = msatoshi;
h->rhash = *rhash;
h->r = NULL;
h->fail = NULL;
if (!blocks_to_abs_locktime(expiry, &h->expiry))
fatal("Invalid HTLC expiry %u", expiry);
h->routing = tal_dup_arr(h, u8, route, routelen, 0);
h->src = src;
if (htlc_owner(h) == LOCAL) {
if (src) {
h->deadline = abs_locktime_to_blocks(&src->expiry)
- peer->dstate->config.deadline_blocks;
} else
/* If we're paying, give it a little longer. */
h->deadline = expiry
+ peer->dstate->config.min_htlc_expiry;
} else {
assert(htlc_owner(h) == REMOTE);
}
htlc_map_add(&peer->htlcs, h);
tal_add_destructor(h, htlc_destroy);
return h;
}
static struct io_plan *crypto_on_reconnect(struct io_conn *conn,
struct lightningd_state *dstate,
struct io_data *iod,
const struct pubkey *id,
struct peer *peer,
bool we_connected)
{
/* Setup peer->conn and peer->io_data */
if (!peer_reconnected(peer, conn, SOCK_STREAM, IPPROTO_TCP,
iod, id, we_connected))
return io_close(conn);
/* We need to eliminate queue now. */
clear_output_queue(peer);
return peer_send_init(conn, peer);
}
static struct io_plan *crypto_on_reconnect_in(struct io_conn *conn,
struct lightningd_state *dstate,
struct io_data *iod,
struct log *log,
const struct pubkey *id,
struct peer *peer)
{
assert(log == peer->log);
return crypto_on_reconnect(conn, dstate, iod, id, peer, false);
}
static struct io_plan *crypto_on_reconnect_out(struct io_conn *conn,
struct lightningd_state *dstate,
struct io_data *iod,
struct log *log,
const struct pubkey *id,
struct peer *peer)
{
assert(log == peer->log);
return crypto_on_reconnect(conn, dstate, iod, id, peer, true);
}
static struct io_plan *crypto_on_out(struct io_conn *conn,
struct lightningd_state *dstate,
struct io_data *iod,
struct log *log,
const struct pubkey *id,
struct json_connecting *connect)
{
struct peer *peer;
if (find_peer(dstate, id)) {
command_fail(connect->cmd, "Already connected to peer %s",
pubkey_to_hexstr(connect->cmd, id));
return io_close(conn);
}
/* Initiator currently funds channel */
peer = new_peer(dstate, log, STATE_INIT, true);
if (!peer_first_connected(peer, conn, SOCK_STREAM, IPPROTO_TCP,
iod, id, true)) {
command_fail(connect->cmd, "Failed to make peer for %s:%s",
connect->name, connect->port);
return io_close(conn);
}
peer->anchor.input = tal_steal(peer, connect->input);
peer->open_jsoncmd = connect->cmd;
return peer_crypto_on(conn, peer);
}
static struct io_plan *peer_connected_out(struct io_conn *conn,
struct lightningd_state *dstate,
struct json_connecting *connect)
{
struct log *l;
struct netaddr addr;
l = new_log(conn, dstate->log_book, "OUT-%s:%s:",
connect->name, connect->port);
if (!netaddr_from_fd(io_conn_fd(conn), SOCK_STREAM, IPPROTO_TCP, &addr)) {
log_unusual(l, "Failed to get netaddr: %s", strerror(errno));
return io_close(conn);
}
log_debug_struct(l, "Connected out to %s", struct netaddr, &addr);
return peer_crypto_setup(conn, dstate, NULL, l, crypto_on_out, connect);
}
static struct io_plan *crypto_on_in(struct io_conn *conn,
struct lightningd_state *dstate,
struct io_data *iod,
struct log *log,
const struct pubkey *id,
void *unused)
{
struct peer *peer;
/* FIXME-OLD #2:
*
* A node MUST handle continuing a previous channel on a new encrypted
* transport. */
peer = find_peer(dstate, id);
if (peer) {
/* Close any existing connection, without side effects. */
if (peer->conn) {
log_debug(log, "This is reconnect for peer %p", peer);
log_debug(peer->log, "Reconnect: closing old conn %p for new conn %p",
peer->conn, conn);
io_set_finish(peer->conn, NULL, NULL);
io_close(peer->conn);
peer->conn = NULL;
peer->connected = false;
}
return crypto_on_reconnect_in(conn, dstate, iod, peer->log, id,
peer);
}
/* Initiator currently funds channel */
peer = new_peer(dstate, log, STATE_INIT, false);
if (!peer_first_connected(peer, conn, SOCK_STREAM, IPPROTO_TCP,
iod, id, false))
return io_close(conn);
return peer_crypto_on(conn, peer);
}
static struct io_plan *peer_connected_in(struct io_conn *conn,
struct lightningd_state *dstate)
{
struct netaddr addr;
struct log *l;
const char *name;
if (!netaddr_from_fd(io_conn_fd(conn), SOCK_STREAM, IPPROTO_TCP, &addr))
return false;
name = netaddr_name(conn, &addr);
l = new_log(conn, dstate->log_book, "IN-%s:", name);
log_debug(l, "Connected in");
return peer_crypto_setup(conn, dstate, NULL, l, crypto_on_in, NULL);
}
static int make_listen_fd(struct lightningd_state *dstate,
int domain, void *addr, socklen_t len)
{
int fd = socket(domain, SOCK_STREAM, 0);
if (fd < 0) {
log_debug(dstate->base_log, "Failed to create %u socket: %s",
domain, strerror(errno));
return -1;
}
if (addr) {
int on = 1;
/* Re-use, please.. */
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)))
log_unusual(dstate->base_log,
"Failed setting socket reuse: %s",
strerror(errno));
if (bind(fd, addr, len) != 0) {
log_unusual(dstate->base_log,
"Failed to bind on %u socket: %s",
domain, strerror(errno));
goto fail;
}
}
if (listen(fd, 5) != 0) {
log_unusual(dstate->base_log,
"Failed to listen on %u socket: %s",
domain, strerror(errno));
goto fail;
}
return fd;
fail:
close_noerr(fd);
return -1;
}
void setup_listeners(struct lightningd_state *dstate)
{
struct sockaddr_in addr;
struct sockaddr_in6 addr6;
socklen_t len;
int fd1, fd2;
if (!dstate->portnum)
return;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(dstate->portnum);
memset(&addr6, 0, sizeof(addr6));
addr6.sin6_family = AF_INET6;
addr6.sin6_addr = in6addr_any;
addr6.sin6_port = htons(dstate->portnum);
/* IPv6, since on Linux that (usually) binds to IPv4 too. */
fd1 = make_listen_fd(dstate, AF_INET6, &addr6, sizeof(addr6));
if (fd1 >= 0) {
struct sockaddr_in6 in6;
len = sizeof(in6);
if (getsockname(fd1, (void *)&in6, &len) != 0) {
log_unusual(dstate->base_log,
"Failed get IPv6 sockname: %s",
strerror(errno));
close_noerr(fd1);
} else {
addr.sin_port = in6.sin6_port;
assert(dstate->portnum == ntohs(addr.sin_port));
log_debug(dstate->base_log,
"Creating IPv6 listener on port %u",
dstate->portnum);
io_new_listener(dstate, fd1, peer_connected_in, dstate);
}
}
/* Just in case, aim for the same port... */
fd2 = make_listen_fd(dstate, AF_INET, &addr, sizeof(addr));
if (fd2 >= 0) {
len = sizeof(addr);
if (getsockname(fd2, (void *)&addr, &len) != 0) {
log_unusual(dstate->base_log,
"Failed get IPv4 sockname: %s",
strerror(errno));
close_noerr(fd2);
} else {
assert(dstate->portnum == ntohs(addr.sin_port));
log_debug(dstate->base_log,
"Creating IPv4 listener on port %u",
dstate->portnum);
io_new_listener(dstate, fd2, peer_connected_in, dstate);
}
}
if (fd1 < 0 && fd2 < 0)
fatal("Could not bind to a network address");
}
static void peer_failed(struct lightningd_state *dstate,
struct json_connecting *connect)
{
/* FIXME: Better diagnostics! */
command_fail(connect->cmd, "Failed to connect to peer %s:%s",
connect->name, connect->port);
}
static void json_connect(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct json_connecting *connect;
jsmntok_t *host, *port, *txtok;
struct bitcoin_tx *tx;
int output;
size_t txhexlen;
u64 fee;
const tal_t *tmpctx = tal_tmpctx(cmd);
if (!json_get_params(buffer, params,
"host", &host,
"port", &port,
"tx", &txtok,
NULL)) {
command_fail(cmd, "Need host, port and tx to a wallet address");
return;
}
connect = tal(cmd, struct json_connecting);
connect->cmd = cmd;
connect->name = tal_strndup(connect, buffer + host->start,
host->end - host->start);
connect->port = tal_strndup(connect, buffer + port->start,
port->end - port->start);
connect->input = tal(connect, struct anchor_input);
txhexlen = txtok->end - txtok->start;
tx = bitcoin_tx_from_hex(tmpctx, buffer + txtok->start, txhexlen);
if (!tx) {
command_fail(cmd, "'%.*s' is not a valid transaction",
txtok->end - txtok->start,
buffer + txtok->start);
return;
}
bitcoin_txid(tx, &connect->input->txid);
/* Find an output we know how to spend. */
for (output = 0; output < tal_count(tx->output); output++) {
if (wallet_can_spend(cmd->dstate, &tx->output[output],
&connect->input->walletkey))
break;
}
if (output == tal_count(tx->output)) {
command_fail(cmd, "Tx doesn't send to wallet address");
return;
}
connect->input->index = output;
connect->input->in_amount = tx->output[output].amount;
/* FIXME: This is normal case, not exact. */
fee = fee_by_feerate(94 + 1+73 + 1+33 + 1, get_feerate(cmd->dstate->topology));
if (fee >= connect->input->in_amount) {
command_fail(cmd, "Amount %"PRIu64" below fee %"PRIu64,
connect->input->in_amount, fee);
return;
}
connect->input->out_amount = connect->input->in_amount - fee;
if (anchor_too_large(connect->input->out_amount)) {
command_fail(cmd, "Amount %"PRIu64" is too large",
connect->input->out_amount);
return;
}
if (!dns_resolve_and_connect(cmd->dstate, connect->name, connect->port,
peer_connected_out, peer_failed, connect)) {
command_fail(cmd, "DNS failed");
return;
}
tal_free(tmpctx);
}
static const struct json_command connect_command = {
"connect",
json_connect,
"Connect to a {host} at {port} using hex-encoded {tx} to fund",
"Returns the {id} on success (once channel established)"
};
AUTODATA(json_command, &connect_command);
/* Have any of our HTLCs passed their deadline? */
static bool any_deadline_past(struct peer *peer)
{
u32 height = get_block_height(peer->dstate->topology);
struct htlc_map_iter it;
struct htlc *h;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (htlc_is_dead(h))
continue;
if (htlc_owner(h) != LOCAL)
continue;
if (height >= h->deadline) {
log_unusual_struct(peer->log,
"HTLC %s deadline has passed",
struct htlc, h);
return true;
}
}
return false;
}
static void check_htlc_expiry(struct peer *peer)
{
u32 height = get_block_height(peer->dstate->topology);
struct htlc_map_iter it;
struct htlc *h;
/* Check their currently still-existing htlcs for expiry */
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
assert(!abs_locktime_is_seconds(&h->expiry));
/* Only their consider HTLCs which are completely locked in. */
if (h->state != RCVD_ADD_ACK_REVOCATION)
continue;
/* We give it an extra block, to avoid the worst of the
* inter-node timing issues. */
if (height <= abs_locktime_to_blocks(&h->expiry))
continue;
db_start_transaction(peer);
/* This can fail only if we're in an error state. */
command_htlc_set_fail(peer, h,
REQUEST_TIMEOUT_408, "timed out");
if (db_commit_transaction(peer) != NULL) {
peer_fail(peer, __func__);
return;
}
}
/* FIXME-OLD #2:
*
* A node MUST NOT offer a HTLC after this deadline, and MUST
* fail the connection if an HTLC which it offered is in
* either node's current commitment transaction past this
* deadline.
*/
/* To save logic elsewhere (ie. to avoid signing a new commit with a
* past-deadline HTLC) we also check staged HTLCs.
*/
if (!state_is_normal(peer->state))
return;
if (any_deadline_past(peer))
peer_fail(peer, __func__);
}
static void peer_depth_ok(struct peer *peer)
{
queue_pkt_open_complete(peer);
db_start_transaction(peer);
switch (peer->state) {
case STATE_OPEN_WAIT_ANCHORDEPTH_AND_THEIRCOMPLETE:
set_peer_state(peer, STATE_OPEN_WAIT_THEIRCOMPLETE,
__func__, true);
break;
case STATE_OPEN_WAIT_ANCHORDEPTH:
peer_open_complete(peer, NULL);
set_peer_state(peer, STATE_NORMAL, __func__, true);
announce_channel(peer->dstate, peer);
sync_routing_table(peer->dstate, peer);
break;
default:
log_broken(peer->log, "%s: state %s",
__func__, state_name(peer->state));
peer_fail(peer, __func__);
break;
}
if (db_commit_transaction(peer))
peer_database_err(peer);
}
static enum watch_result anchor_depthchange(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
void *unused)
{
log_debug(peer->log, "Anchor at depth %u", depth);
/* Still waiting for it to reach depth? */
if (state_is_waiting_for_anchor(peer->state)) {
log_debug(peer->log, "Waiting for depth %i",
peer->anchor.ok_depth);
/* We can see a run of blocks all at once, so may be > depth */
if ((int)depth >= peer->anchor.ok_depth) {
peer_depth_ok(peer);
peer->anchor.ok_depth = -1;
}
} else if (depth == 0)
/* FIXME: Report losses! */
fatal("Funding transaction was unspent!");
/* Since this gets called on every new block, check HTLCs here. */
check_htlc_expiry(peer);
/* If fee rate has changed, fire off update to change it. */
if (want_feechange(peer) && state_can_commit(peer->state)) {
log_debug(peer->log, "fee rate changed to %"PRIu64,
desired_commit_feerate(peer->dstate));
/* FIXME: If fee changes back before update, we screw
* up and send an empty commit. We need to generate a
* real packet here! */
remote_changes_pending(peer);
}
/* FIXME-OLD #2:
*
* A node MUST update bitcoin fees if it estimates that the
* current commitment transaction will not be processed in a
* timely manner (see "Risks With HTLC Timeouts").
*/
/* Note: we don't do this when we're told to ignore fees. */
/* FIXME: BOLT should say what to do if it can't! We drop conn. */
if (!state_is_onchain(peer->state) && !state_is_error(peer->state)
&& peer->dstate->config.commitment_fee_min_percent != 0
&& peer->local.commit->cstate->fee_rate < get_feerate(peer->dstate->topology)) {
log_broken(peer->log, "fee rate %"PRIu64" lower than %"PRIu64,
peer->local.commit->cstate->fee_rate,
get_feerate(peer->dstate->topology));
peer_fail(peer, __func__);
}
return KEEP_WATCHING;
}
void notify_new_block(struct chain_topology *topo, unsigned int height)
{
struct lightningd_state *dstate = tal_parent(topo);
/* This is where we check for anchor timeouts. */
struct peer *peer;
list_for_each(&dstate->peers, peer, list) {
if (!state_is_waiting_for_anchor(peer->state))
continue;
/* If we haven't seen anchor yet, we can timeout. */
if (height >= peer->anchor.min_depth
+ dstate->config.anchor_onchain_wait
+ dstate->config.anchor_confirms) {
queue_pkt_err(peer, pkt_err(peer, "Funding timeout"));
set_peer_state(peer, STATE_ERR_ANCHOR_TIMEOUT, __func__,
false);
peer_breakdown(peer);
}
}
}
static bool outputscript_eq(const struct bitcoin_tx_output *out,
size_t i, const u8 *script)
{
if (tal_count(out[i].script) != tal_count(script))
return false;
return memcmp(out[i].script, script, tal_count(script)) == 0;
}
/* This tx is their commitment;
* fill in onchain.htlcs[], wscripts[], to_us_idx and to_them_idx */
static bool map_onchain_outputs(struct peer *peer,
const struct sha256 *rhash,
const struct bitcoin_tx *tx,
enum side side,
unsigned int commit_num)
{
u8 *to_us, *to_them, *to_them_wscript, *to_us_wscript;
struct htlc_output_map *hmap;
size_t i;
peer->onchain.to_us_idx = peer->onchain.to_them_idx = -1;
peer->onchain.htlcs = tal_arr(tx, struct htlc *, tal_count(tx->output));
peer->onchain.wscripts = tal_arr(tx, const u8 *, tal_count(tx->output));
to_us = commit_output_to_us(tx, peer, rhash, side, &to_us_wscript);
to_them = commit_output_to_them(tx, peer, rhash, side,
&to_them_wscript);
/* Now generate the wscript hashes for every possible HTLC. */
hmap = get_htlc_output_map(tx, peer, rhash, side, commit_num);
for (i = 0; i < tal_count(tx->output); i++) {
log_debug(peer->log, "%s: output %zi", __func__, i);
if (peer->onchain.to_us_idx == -1
&& outputscript_eq(tx->output, i, to_us)) {
log_add(peer->log, " -> to us");
peer->onchain.htlcs[i] = NULL;
peer->onchain.wscripts[i] = to_us_wscript;
peer->onchain.to_us_idx = i;
continue;
}
if (peer->onchain.to_them_idx == -1
&& outputscript_eq(tx->output, i, to_them)) {
log_add(peer->log, " -> to them");
peer->onchain.htlcs[i] = NULL;
peer->onchain.wscripts[i] = to_them_wscript;
peer->onchain.to_them_idx = i;
continue;
}
/* Must be an HTLC output */
peer->onchain.htlcs[i] = txout_get_htlc(hmap,
tx->output[i].script,
peer->onchain.wscripts+i);
if (!peer->onchain.htlcs[i]) {
log_add(peer->log, "no HTLC found");
goto fail;
}
tal_steal(peer->onchain.htlcs, peer->onchain.htlcs[i]);
tal_steal(peer->onchain.wscripts, peer->onchain.wscripts[i]);
log_add(peer->log, "HTLC %"PRIu64, peer->onchain.htlcs[i]->id);
}
tal_free(hmap);
return true;
fail:
tal_free(hmap);
return false;
}
static bool is_mutual_close(const struct peer *peer,
const struct bitcoin_tx *tx)
{
const u8 *ours, *theirs;
ours = peer->closing.our_script;
theirs = peer->closing.their_script;
/* If we don't know the closing scripts, can't have signed them. */
if (!ours || !theirs)
return false;
if (tal_count(tx->output) != 2)
return false;
/* Without knowing fee amounts, can't determine order. Check both. */
if (scripteq(tx->output[0].script, ours)
&& scripteq(tx->output[1].script, theirs))
return true;
if (scripteq(tx->output[0].script, theirs)
&& scripteq(tx->output[1].script, ours))
return true;
return false;
}
/* Create a HTLC refund collection for onchain.tx output out_num. */
static const struct bitcoin_tx *htlc_timeout_tx(const struct peer *peer,
unsigned int out_num)
{
const struct htlc *htlc = peer->onchain.htlcs[out_num];
const u8 *wscript = peer->onchain.wscripts[out_num];
struct bitcoin_tx *tx = bitcoin_tx(peer, 1, 1);
secp256k1_ecdsa_signature sig;
u64 fee, satoshis;
/* We must set locktime so HTLC expiry can OP_CHECKLOCKTIMEVERIFY */
tx->lock_time = htlc->expiry.locktime;
tx->input[0].index = out_num;
tx->input[0].txid = peer->onchain.txid;
satoshis = htlc->msatoshi / 1000;
tx->input[0].amount = tal_dup(tx->input, u64, &satoshis);
tx->input[0].sequence_number = bitcoin_nsequence(&peer->remote.locktime);
/* Using a new output address here would be useless: they can tell
* it's our HTLC, and that we collected it via timeout. */
tx->output[0].script = scriptpubkey_p2sh(tx,
bitcoin_redeem_single(tx,
&peer->local.finalkey));
log_unusual(peer->log, "Pre-witness txlen = %zu\n",
measure_tx_cost(tx) / 4);
assert(measure_tx_cost(tx) == 83 * 4);
/* Witness length can vary, due to DER encoding of sigs, but we
* use 539 from an example run. */
fee = fee_by_feerate(83 + 539 / 4, get_feerate(peer->dstate->topology));
/* FIXME: Fail gracefully in these cases (not worth collecting) */
if (fee > satoshis || is_dust(satoshis - fee))
fatal("HTLC refund amount of %"PRIu64" won't cover fee %"PRIu64,
satoshis, fee);
tx->output[0].amount = satoshis - fee;
peer_sign_htlc_refund(peer, tx, wscript, &sig);
tx->input[0].witness = bitcoin_witness_htlc(tx,
NULL, &sig, wscript);
log_unusual(peer->log, "tx cost for htlc timeout tx: %zu",
measure_tx_cost(tx));
return tx;
}
static void reset_onchain_closing(struct peer *peer)
{
if (peer->onchain.tx) {
log_unusual_struct(peer->log,
"New anchor spend, forgetting old tx %s",
struct sha256_double, &peer->onchain.txid);
peer->onchain.tx = tal_free(peer->onchain.tx);
peer->onchain.resolved = NULL;
peer->onchain.htlcs = NULL;
peer->onchain.wscripts = NULL;
}
}
static const struct bitcoin_tx *irrevocably_resolved(struct peer *peer)
{
/* We can't all be irrevocably resolved until the commit tx is,
* so just mark that as resolving us. */
return peer->onchain.tx;
}
/* We usually don't fail HTLCs we offered, but if the peer breaks down
* before we've confirmed it, this is exactly what happens. */
static void fail_own_htlc(struct peer *peer, struct htlc *htlc)
{
/* We can't do anything about db failures; peer already closed. */
db_start_transaction(peer);
set_htlc_fail(peer, htlc, "peer closed", strlen("peer closed"));
our_htlc_failed(peer, htlc);
db_commit_transaction(peer);
}
/* We've spent an HTLC output to get our funds back. There's still a
* chance that they could also spend the HTLC output (using the preimage),
* so we need to wait for some confirms.
*
* However, we don't want to wait too long: our upstream will get upset if
* their HTLC has timed out and we don't close it. So we wait one less
* than the HTLC timeout difference.
*/
static enum watch_result our_htlc_timeout_depth(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
struct htlc *htlc)
{
if (depth == 0)
return KEEP_WATCHING;
if (depth + 1 < peer->dstate->config.min_htlc_expiry)
return KEEP_WATCHING;
fail_own_htlc(peer, htlc);
return DELETE_WATCH;
}
static enum watch_result our_htlc_depth(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
enum side whose_commit,
unsigned int out_num)
{
struct htlc *h = peer->onchain.htlcs[out_num];
u32 height;
/* Must be in a block. */
if (depth == 0)
return KEEP_WATCHING;
height = get_block_height(peer->dstate->topology);
/* FIXME-OLD #onchain:
*
* If the *commitment tx* is the other node's, the output is
* considered *timed out* once the HTLC is expired. If the
* *commitment tx* is this node's, the output is considered *timed
* out* once the HTLC is expired, AND the output's
* `OP_CHECKSEQUENCEVERIFY` delay has passed.
*/
if (height < abs_locktime_to_blocks(&h->expiry))
return KEEP_WATCHING;
if (whose_commit == LOCAL) {
if (depth < rel_locktime_to_blocks(&peer->remote.locktime))
return KEEP_WATCHING;
}
/* FIXME-OLD #onchain:
*
* If the output has *timed out* and not been *resolved*, the node
* MUST *resolve* the output by spending it.
*/
/* FIXME: we should simply delete this watch if HTLC is fulfilled. */
if (!peer->onchain.resolved[out_num]) {
peer->onchain.resolved[out_num] = htlc_timeout_tx(peer, out_num);
watch_tx(peer->onchain.resolved[out_num],
peer->dstate->topology,
peer,
peer->onchain.resolved[out_num],
our_htlc_timeout_depth, h);
broadcast_tx(peer->dstate->topology,
peer, peer->onchain.resolved[out_num], NULL);
}
return DELETE_WATCH;
}
static enum watch_result our_htlc_depth_theircommit(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
ptrint_t *out_num)
{
return our_htlc_depth(peer, depth, txid, REMOTE, ptr2int(out_num));
}
static enum watch_result our_htlc_depth_ourcommit(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
ptrint_t *out_num)
{
return our_htlc_depth(peer, depth, txid, LOCAL, ptr2int(out_num));
}
static enum watch_result their_htlc_depth(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
ptrint_t *out_num)
{
u32 height;
const struct htlc *htlc = peer->onchain.htlcs[ptr2int(out_num)];
/* Must be in a block. */
if (depth == 0)
return KEEP_WATCHING;
height = get_block_height(peer->dstate->topology);
/* FIXME-OLD #onchain:
*
* Otherwise, if the output HTLC has expired, it is considered
* *irrevocably resolved*.
*/
if (height < abs_locktime_to_blocks(&htlc->expiry))
return KEEP_WATCHING;
peer->onchain.resolved[ptr2int(out_num)] = irrevocably_resolved(peer);
return DELETE_WATCH;
}
static enum watch_result our_main_output_depth(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
void *unused)
{
/* Not past CSV timeout? */
if (depth < rel_locktime_to_blocks(&peer->remote.locktime))
return KEEP_WATCHING;
assert(peer->onchain.to_us_idx != -1);
/* FIXME-OLD #onchain:
*
* 1. _A's main output_: A node SHOULD spend this output to a
* convenient address. This avoids having to remember the
* complicated witness script associated with that particular
* channel for later spending. ... If the output is spent (as
* recommended), the output is *resolved* by the spending
* transaction
*/
peer->onchain.resolved[peer->onchain.to_us_idx]
= bitcoin_spend_ours(peer);
broadcast_tx(peer->dstate->topology,
peer, peer->onchain.resolved[peer->onchain.to_us_idx],
NULL);
return DELETE_WATCH;
}
/* Any of our HTLCs we didn't have in our commitment tx, but they did,
* we can't fail until we're sure our commitment tx will win. */
static enum watch_result our_unilateral_depth(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
void *unused)
{
struct htlc_map_iter it;
struct htlc *h;
if (depth < peer->dstate->config.min_htlc_expiry)
return KEEP_WATCHING;
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (htlc_owner(h) == LOCAL
&& !htlc_has(h, HTLC_LOCAL_F_COMMITTED)
&& htlc_has(h, HTLC_REMOTE_F_COMMITTED)) {
log_debug(peer->log,
"%s:failing uncommitted htlc %"PRIu64,
__func__, h->id);
fail_own_htlc(peer, h);
}
}
return DELETE_WATCH;
}
static enum watch_result our_htlc_spent(struct peer *peer,
const struct bitcoin_tx *tx,
size_t input_num,
struct htlc *h)
{
struct sha256 sha;
struct preimage preimage;
/* FIXME-OLD #onchain:
*
* If a node sees a redemption transaction...the node MUST extract the
* preimage from the transaction input witness. This is either to
* prove payment (if this node originated the payment), or to redeem
* the corresponding incoming HTLC from another peer.
*/
/* This is the form of all HTLC spends. */
if (!tx->input[input_num].witness
|| tal_count(tx->input[input_num].witness) != 3
|| tal_count(tx->input[input_num].witness[1]) != sizeof(preimage))
fatal("Impossible HTLC spend for %"PRIu64, h->id);
/* Our timeout tx has all-zeroes, so we can distinguish it. */
if (memeqzero(tx->input[input_num].witness[1], sizeof(preimage)))
/* They might try to race us. */
return KEEP_WATCHING;
memcpy(&preimage, tx->input[input_num].witness[1], sizeof(preimage));
sha256(&sha, &preimage, sizeof(preimage));
/* FIXME: This could happen with a ripemd collision, since
* script.c only checks that ripemd matches... */
if (!structeq(&sha, &h->rhash))
fatal("HTLC redeemed with incorrect r value?");
log_unusual(peer->log, "Peer redeemed HTLC %"PRIu64" on-chain",
h->id);
log_add_struct(peer->log, " using rvalue %s", struct preimage, &preimage);
set_htlc_rval(peer, h, &preimage);
our_htlc_fulfilled(peer, h);
/* FIXME-OLD #onchain:
*
* If a node sees a redemption transaction, the output is considered
* *irrevocably resolved*... Note that we don't care about the fate of
* the redemption transaction itself once we've extracted the
* preimage; the knowledge is not revocable.
*/
peer->onchain.resolved[tx->input[input_num].index]
= irrevocably_resolved(peer);
return DELETE_WATCH;
}
static void resolve_our_htlc(struct peer *peer,
unsigned int out_num,
enum watch_result (*cb)(struct peer *peer,
unsigned int depth,
const struct sha256_double*,
ptrint_t *out_num))
{
/* FIXME-OLD #onchain:
*
* A node MUST watch for spends of *commitment tx* outputs for HTLCs
* it offered; each one must be *resolved* by a timeout transaction
* (the node pays back to itself) or redemption transaction (the other
* node provides the redemption preimage).
*/
watch_txo(peer->onchain.tx,
peer->dstate->topology,
peer, &peer->onchain.txid, out_num,
our_htlc_spent, peer->onchain.htlcs[out_num]);
watch_txid(peer->onchain.tx,
peer->dstate->topology,
peer, &peer->onchain.txid, cb, int2ptr(out_num));
}
static void resolve_their_htlc(struct peer *peer, unsigned int out_num)
{
/* FIXME-OLD #onchain:
*
* If the node ... already knows... a redemption preimage for an
* unresolved *commitment tx* output it was offered, it MUST *resolve*
* the output by spending it using the preimage.
*/
if (peer->onchain.htlcs[out_num]->r) {
peer->onchain.resolved[out_num] = htlc_fulfill_tx(peer, out_num);
broadcast_tx(peer->dstate->topology,
peer, peer->onchain.resolved[out_num], NULL);
} else {
/* FIXME-OLD #onchain:
*
* Otherwise, if the output HTLC has expired, it is considered
* *irrevocably resolved*.
*/
watch_tx(peer->onchain.tx,
peer->dstate->topology,
peer, peer->onchain.tx,
their_htlc_depth, int2ptr(out_num));
}
}
/* FIXME-OLD #onchain:
*
* When node A sees its own *commitment tx*:
*/
static void resolve_our_unilateral(struct peer *peer)
{
unsigned int i;
struct chain_topology *topo = peer->dstate->topology;
const struct bitcoin_tx *tx = peer->onchain.tx;
/* This only works because we always watch for a long time before
* freeing peer, by which time this has resolved. We could create
* resolved[] entries for these uncommitted HTLCs, too. */
watch_tx(tx, topo, peer, tx, our_unilateral_depth, NULL);
for (i = 0; i < tal_count(tx->output); i++) {
/* FIXME-OLD #onchain:
*
* 1. _A's main output_: A node SHOULD spend this output to a
* convenient address. ... A node MUST wait until the
* `OP_CHECKSEQUENCEVERIFY` delay has passed (as specified
* by the other node's `open_channel` `delay` field) before
* spending the output.
*/
if (i == peer->onchain.to_us_idx)
watch_tx(tx, topo,
peer, tx, our_main_output_depth, NULL);
/* FIXME-OLD #onchain:
*
* 2. _B's main output_: No action required, this output is
* considered *resolved* by the *commitment tx*.
*/
else if (i == peer->onchain.to_them_idx)
peer->onchain.resolved[i] = tx;
/* FIXME-OLD #onchain:
*
* 3. _A's offered HTLCs_: See On-chain HTLC Handling: Our
* Offers below.
*/
else if (htlc_owner(peer->onchain.htlcs[i]) == LOCAL)
resolve_our_htlc(peer, i, our_htlc_depth_ourcommit);
/* FIXME-OLD #onchain:
*
* 4. _B's offered HTLCs_: See On-chain HTLC Handling: Their
* Offers below.
*/
else
resolve_their_htlc(peer, i);
}
}
/* FIXME-OLD #onchain:
*
* Similarly, when node A sees a *commitment tx* from B:
*/
static void resolve_their_unilateral(struct peer *peer)
{
unsigned int i;
const struct bitcoin_tx *tx = peer->onchain.tx;
for (i = 0; i < tal_count(tx->output); i++) {
/* FIXME-OLD #onchain:
*
* 1. _A's main output_: No action is required; this is a
* simple P2WPKH output. This output is considered
* *resolved* by the *commitment tx*.
*/
if (i == peer->onchain.to_us_idx)
peer->onchain.resolved[i] = tx;
/* FIXME-OLD #onchain:
*
* 2. _B's main output_: No action required, this output is
* considered *resolved* by the *commitment tx*.
*/
else if (i == peer->onchain.to_them_idx)
peer->onchain.resolved[i] = tx;
/* FIXME-OLD #onchain:
*
* 3. _A's offered HTLCs_: See On-chain HTLC Handling: Our
* Offers below.
*/
else if (htlc_owner(peer->onchain.htlcs[i]) == LOCAL)
resolve_our_htlc(peer, i, our_htlc_depth_theircommit);
/*
* 4. _B's offered HTLCs_: See On-chain HTLC Handling: Their
* Offers below.
*/
else
resolve_their_htlc(peer, i);
}
}
static void resolve_mutual_close(struct peer *peer)
{
unsigned int i;
/* FIXME-OLD #onchain:
*
* A node doesn't need to do anything else as it has already agreed to
* the output, which is sent to its specified scriptpubkey (see FIXME-OLD
* #2 "4.1: Closing initiation: close_shutdown").
*/
for (i = 0; i < tal_count(peer->onchain.tx->output); i++)
peer->onchain.resolved[i] = irrevocably_resolved(peer);
/* No HTLCs. */
peer->onchain.htlcs = tal_arrz(peer->onchain.tx,
struct htlc *,
tal_count(peer->onchain.tx->output));
}
/* Called every time the tx spending the funding tx changes depth. */
static enum watch_result check_for_resolution(struct peer *peer,
unsigned int depth,
const struct sha256_double *txid,
void *unused)
{
size_t i, n = tal_count(peer->onchain.resolved);
size_t forever = peer->dstate->config.forever_confirms;
/* FIXME-OLD #onchain:
*
* A node MUST *resolve* all outputs as specified below, and MUST be
* prepared to resolve them multiple times in case of blockchain
* reorganizations.
*/
for (i = 0; i < n; i++)
if (!peer->onchain.resolved[i])
return KEEP_WATCHING;
/* FIXME-OLD #onchain:
*
* Outputs which are *resolved* by a transaction are considered
* *irrevocably resolved* once they are included in a block at least
* 100 deep on the most-work blockchain.
*/
if (depth < forever)
return KEEP_WATCHING;
for (i = 0; i < n; i++) {
struct sha256_double txid;
bitcoin_txid(peer->onchain.resolved[i], &txid);
if (get_tx_depth(peer->dstate->topology, &txid) < forever)
return KEEP_WATCHING;
}
/* FIXME-OLD #onchain:
*
* A node MUST monitor the blockchain for transactions which spend any
* output which is not *irrevocably resolved* until all outputs are
* *irrevocably resolved*.
*/
set_peer_state(peer, STATE_CLOSED, "check_for_resolution", false);
db_forget_peer(peer);
/* It's theoretically possible that peer is still writing output */
if (!peer->conn)
io_break(peer);
else
io_wake(peer);
return DELETE_WATCH;
}
static bool find_their_old_tx(struct peer *peer,
const struct sha256_double *txid,
u64 *idx)
{
/* FIXME: Don't keep these in memory, search db here. */
struct their_commit *tc;
log_debug_struct(peer->log, "Finding txid %s", struct sha256_double,
txid);
list_for_each(&peer->their_commits, tc, list) {
if (structeq(&tc->txid, txid)) {
*idx = tc->commit_num;
return true;
}
}
return false;
}
static void resolve_their_steal(struct peer *peer,
const struct sha256 *revocation_preimage)
{
int i, n;
const struct bitcoin_tx *tx = peer->onchain.tx;
struct bitcoin_tx *steal_tx;
size_t wsize = 0;
u64 input_total = 0, fee;
/* Create steal_tx: don't need to steal to_us output */
if (peer->onchain.to_us_idx == -1)
steal_tx = bitcoin_tx(tx, tal_count(tx->output), 1);
else
steal_tx = bitcoin_tx(tx, tal_count(tx->output) - 1, 1);
n = 0;
log_debug(peer->log, "Analyzing tx to steal:");
for (i = 0; i < tal_count(tx->output); i++) {
/* FIXME-OLD #onchain:
* 1. _A's main output_: No action is required; this is a
* simple P2WPKH output. This output is considered
* *resolved* by the *commitment tx*.
*/
if (i == peer->onchain.to_us_idx) {
log_debug(peer->log, "%i is to-us, ignoring", i);
peer->onchain.resolved[i] = tx;
continue;
}
/* FIXME-OLD #onchain:
*
* 2. _B's main output_: The node MUST *resolve* this by
* spending using the revocation preimage.
*
* 3. _A's offered HTLCs_: The node MUST *resolve* this by
* spending using the revocation preimage.
*
* 4. _B's offered HTLCs_: The node MUST *resolve* this by
* spending using the revocation preimage.
*/
peer->onchain.resolved[i] = steal_tx;
/* Connect it up. */
steal_tx->input[n].txid = peer->onchain.txid;
steal_tx->input[n].index = i;
steal_tx->input[n].amount = tal_dup(steal_tx, u64,
&tx->output[i].amount);
/* Track witness size, for fee. */
wsize += tal_count(peer->onchain.wscripts[i]);
input_total += tx->output[i].amount;
n++;
}
assert(n == tal_count(steal_tx->input));
fee = get_feerate(peer->dstate->topology)
* (measure_tx_cost(steal_tx) + wsize) / 1000;
if (fee > input_total || is_dust(input_total - fee)) {
log_unusual(peer->log, "Not worth stealing tiny amount %"PRIu64,
input_total);
/* Consider them all resolved by steal tx. */
for (i = 0; i < tal_count(peer->onchain.resolved); i++)
peer->onchain.resolved[i] = tx;
tal_free(steal_tx);
return;
}
steal_tx->output[0].amount = input_total - fee;
steal_tx->output[0].script = scriptpubkey_p2sh(steal_tx,
bitcoin_redeem_single(steal_tx,
&peer->local.finalkey));
/* Now, we can sign them all (they're all of same form). */
n = 0;
for (i = 0; i < tal_count(tx->output); i++) {
secp256k1_ecdsa_signature sig;
/* Don't bother stealing the output already to us. */
if (i == peer->onchain.to_us_idx)
continue;
peer_sign_steal_input(peer, steal_tx, n,
peer->onchain.wscripts[i],
&sig);
steal_tx->input[n].witness
= bitcoin_witness_secret(steal_tx,
revocation_preimage,
sizeof(*revocation_preimage),
&sig,
peer->onchain.wscripts[i]);
n++;
}
assert(n == tal_count(steal_tx->input));
broadcast_tx(peer->dstate->topology, peer, steal_tx, NULL);
}
static struct sha256 *get_rhash(struct peer *peer, u64 commit_num,
struct sha256 *rhash)
{
struct sha256 preimage;
/* Previous revoked tx? */
if (shachain_get_hash(&peer->their_preimages,
0xFFFFFFFFFFFFFFFFL - commit_num,
&preimage)) {
sha256(rhash, &preimage, sizeof(preimage));
return tal_dup(peer, struct sha256, &preimage);
}
/* Current tx? */
if (commit_num == peer->remote.commit->commit_num) {
*rhash = peer->remote.commit->revocation_hash;
return NULL;
}
/* Last tx, but we haven't got revoke for it yet? */
assert(commit_num == peer->remote.commit->commit_num-1);
*rhash = *peer->their_prev_revocation_hash;
return NULL;
}
/* We assume the tx is valid! Don't do a blockchain.info and feed this
* invalid transactions! */
static enum watch_result anchor_spent(struct peer *peer,
const struct bitcoin_tx *tx,
size_t input_num,
void *unused)
{
Pkt *err;
enum state newstate;
struct htlc_map_iter it;
struct htlc *h;
u64 commit_num;
assert(input_num < tal_count(tx->input));
/* We only ever sign single-input txs. */
if (input_num != 0) {
log_broken(peer->log, "Anchor spend by non-single input tx");
goto unknown_spend;
}
/* We may have been following a different spend. Forget it. */
reset_onchain_closing(peer);
peer->onchain.tx = tal_steal(peer, tx);
bitcoin_txid(tx, &peer->onchain.txid);
/* If we have any HTLCs we're not committed to yet, fail them now. */
for (h = htlc_map_first(&peer->htlcs, &it);
h;
h = htlc_map_next(&peer->htlcs, &it)) {
if (h->state == SENT_ADD_HTLC) {
fail_own_htlc(peer, h);
}
}
/* We need to resolve every output. */
peer->onchain.resolved
= tal_arrz(tx, const struct bitcoin_tx *,
tal_count(tx->output));
/* A mutual close tx. */
if (is_mutual_close(peer, tx)) {
newstate = STATE_CLOSE_ONCHAIN_MUTUAL;
err = NULL;
resolve_mutual_close(peer);
/* Our unilateral */
} else if (structeq(&peer->local.commit->txid,
&peer->onchain.txid)) {
newstate = STATE_CLOSE_ONCHAIN_OUR_UNILATERAL;
/* We're almost certainly closed to them by now. */
err = pkt_err(peer, "Our own unilateral close tx seen");
if (!map_onchain_outputs(peer,
&peer->local.commit->revocation_hash,
tx, LOCAL,
peer->local.commit->commit_num)) {
log_broken(peer->log,
"Can't resolve own anchor spend %"PRIu64"!",
peer->local.commit->commit_num);
goto unknown_spend;
}
resolve_our_unilateral(peer);
/* Must be their unilateral */
} else if (find_their_old_tx(peer, &peer->onchain.txid,
&commit_num)) {
struct sha256 *preimage, rhash;
preimage = get_rhash(peer, commit_num, &rhash);
if (!map_onchain_outputs(peer, &rhash, tx, REMOTE, commit_num)) {
/* Should not happen */
log_broken(peer->log,
"Can't resolve known anchor spend %"PRIu64"!",
commit_num);
goto unknown_spend;
}
if (preimage) {
newstate = STATE_CLOSE_ONCHAIN_CHEATED;
err = pkt_err(peer, "Revoked transaction seen");
resolve_their_steal(peer, preimage);
} else {
newstate = STATE_CLOSE_ONCHAIN_THEIR_UNILATERAL;
err = pkt_err(peer, "Unilateral close tx seen");
resolve_their_unilateral(peer);
}
} else {
/* FIXME: Log harder! */
log_broken(peer->log,
"Unknown anchor spend! Funds may be lost!");
goto unknown_spend;
}
/* FIXME-OLD #onchain:
*
* A node MAY send a descriptive error packet in this case.
*/
if (err && state_can_io(peer->state))
queue_pkt_err(peer, err);
/* Don't need to save to DB: it will be replayed if we crash. */
set_peer_state(peer, newstate, "anchor_spent", false);
/* If we've just closed connection, make output close it. */
io_wake(peer);
/* FIXME-OLD #onchain:
*
* A node SHOULD fail the connection if it is not already
* closed when it sees the funding transaction spent.
*/
assert(!state_can_io(peer->state));
assert(peer->onchain.resolved != NULL);
watch_tx(tx, peer->dstate->topology,
peer, tx, check_for_resolution, NULL);
return KEEP_WATCHING;
unknown_spend:
/* FIXME-OLD #onchain:
*
* A node SHOULD report an error to the operator if it
* sees a transaction spend the funding transaction
* output which does not fall into one of these
* categories (mutual close, unilateral close, or
* cheating attempt). Such a transaction implies its
* private key has leaked, and funds may be lost.
*/
/* FIXME: Save to db. */
set_peer_state(peer, STATE_ERR_INFORMATION_LEAK, "anchor_spent", false);
return DELETE_WATCH;
}
void peer_watch_anchor(struct peer *peer, int depth)
{
struct chain_topology *topo = peer->dstate->topology;
log_debug_struct(peer->log, "watching for anchor %s",
struct sha256_double, &peer->anchor.txid);
log_add(peer->log, " to hit depth %i", depth);
peer->anchor.ok_depth = depth;
watch_txid(peer, topo, peer,
&peer->anchor.txid, anchor_depthchange, NULL);
watch_txo(peer, topo, peer, &peer->anchor.txid, 0, anchor_spent, NULL);
}
struct bitcoin_tx *peer_create_close_tx(const tal_t *ctx,
struct peer *peer, u64 fee)
{
struct channel_state cstate;
/* We don't need a deep copy here, just fee levels. */
cstate = *peer->local.staging_cstate;
if (!force_fee(&cstate, fee)) {
log_unusual(peer->log,
"peer_create_close_tx: can't afford fee %"PRIu64,
fee);
return NULL;
}
log_debug(peer->log,
"creating close-tx with fee %"PRIu64" amounts %u/%u to ",
fee,
cstate.side[LOCAL].pay_msat / 1000,
cstate.side[REMOTE].pay_msat / 1000);
log_add_struct(peer->log, "%s", struct pubkey, &peer->local.finalkey);
log_add_struct(peer->log, "/%s", struct pubkey, &peer->remote.finalkey);
return create_close_tx(ctx,
peer->closing.our_script,
peer->closing.their_script,
&peer->anchor.txid,
peer->anchor.index,
peer->anchor.satoshis,
cstate.side[LOCAL].pay_msat / 1000,
cstate.side[REMOTE].pay_msat / 1000);
}
/* Sets up the initial cstate and commit tx for both nodes: false if
* insufficient funds. */
bool setup_first_commit(struct peer *peer)
{
bool to_them_only, to_us_only;
assert(!peer->local.commit->tx);
assert(!peer->remote.commit->tx);
/* Revocation hashes already filled in, from pkt_open */
peer->local.commit->cstate = initial_cstate(peer->local.commit,
peer->anchor.satoshis,
peer->local.commit_fee_rate,
peer->local.offer_anchor ?
LOCAL : REMOTE);
if (!peer->local.commit->cstate)
return false;
peer->remote.commit->cstate = initial_cstate(peer->remote.commit,
peer->anchor.satoshis,
peer->remote.commit_fee_rate,
peer->local.offer_anchor ?
LOCAL : REMOTE);
if (!peer->remote.commit->cstate)
return false;
peer->local.commit->tx = create_commit_tx(peer->local.commit,
peer,
&peer->local.commit->revocation_hash,
peer->local.commit->cstate,
LOCAL, &to_them_only);
bitcoin_txid(peer->local.commit->tx, &peer->local.commit->txid);
peer->remote.commit->tx = create_commit_tx(peer->remote.commit,
peer,
&peer->remote.commit->revocation_hash,
peer->remote.commit->cstate,
REMOTE, &to_us_only);
assert(to_them_only != to_us_only);
/* If we offer anchor, their commit is to-us only. */
assert(to_us_only == peer->local.offer_anchor);
bitcoin_txid(peer->remote.commit->tx, &peer->remote.commit->txid);
peer->local.staging_cstate = copy_cstate(peer, peer->local.commit->cstate);
peer->remote.staging_cstate = copy_cstate(peer, peer->remote.commit->cstate);
return true;
}
static struct io_plan *peer_reconnect(struct io_conn *conn, struct peer *peer)
{
/* In case they reconnected to us already. */
if (peer->conn)
return io_close(conn);
log_debug(peer->log, "Reconnected, doing crypto...");
peer->conn = conn;
assert(!peer->connected);
assert(peer->id);
return peer_crypto_setup(conn, peer->dstate,
peer->id, peer->log,
crypto_on_reconnect_out, peer);
}
/* We can't only retry when we want to send: they may want to send us
* something but not be able to connect (NAT). So keep retrying.. */
static void reconnect_failed(struct io_conn *conn, struct peer *peer)
{
/* Already otherwise connected (ie. they connected in)? */
if (peer->conn) {
log_debug(peer->log, "reconnect_failed: already connected");
return;
}
log_debug(peer->log, "Setting timer to re-connect");
new_reltimer(&peer->dstate->timers, peer, time_from_sec(15), try_reconnect, peer);
}
static struct io_plan *init_conn(struct io_conn *conn, struct peer *peer)
{
struct addrinfo a;
struct peer_address *addr = find_address(peer->dstate, peer->id);
netaddr_to_addrinfo(&a, &addr->addr);
return io_connect(conn, &a, peer_reconnect, peer);
}
static void try_reconnect(struct peer *peer)
{
struct io_conn *conn;
struct peer_address *addr;
char *name;
int fd;
/* Already reconnected? */
if (peer->conn) {
log_debug(peer->log, "try_reconnect: already connected");
return;
}
addr = find_address(peer->dstate, peer->id);
if (!addr) {
log_debug(peer->log, "try_reconnect: no known address");
return;
}
fd = socket(addr->addr.saddr.s.sa_family, addr->addr.type,
addr->addr.protocol);
if (fd < 0) {
log_broken(peer->log, "do_reconnect: failed to create socket: %s",
strerror(errno));
peer_fail(peer, __func__);
return;
}
assert(!peer->conn);
conn = io_new_conn(peer->dstate, fd, init_conn, peer);
name = netaddr_name(peer, &addr->addr);
log_debug(peer->log, "Trying to reconnect to %s", name);
tal_free(name);
io_set_finish(conn, reconnect_failed, peer);
}
void reconnect_peers(struct lightningd_state *dstate)
{
struct peer *peer;
list_for_each(&dstate->peers, peer, list)
try_reconnect(peer);
}
/* Return earliest block we're interested in, or 0 for none. */
u32 get_peer_min_block(struct lightningd_state *dstate)
{
u32 min_block = 0;
struct peer *peer;
/* If loaded from database, go back to earliest possible peer anchor. */
list_for_each(&dstate->peers, peer, list) {
if (!peer->anchor.min_depth)
continue;
if (min_block == 0 || peer->anchor.min_depth < min_block)
min_block = peer->anchor.min_depth;
}
return min_block;
}
/* We may have gone down before broadcasting the anchor. Try again. */
void rebroadcast_anchors(struct lightningd_state *dstate)
{
struct peer *peer;
list_for_each(&dstate->peers, peer, list) {
if (!state_is_waiting_for_anchor(peer->state))
continue;
if (!peer->anchor.ours)
continue;
if (!bitcoin_create_anchor(peer))
peer_fail(peer, __func__);
else
broadcast_tx(peer->dstate->topology,
peer, peer->anchor.tx, NULL);
}
}
static void json_add_abstime(struct json_result *response,
const char *id,
const struct abs_locktime *t)
{
json_object_start(response, id);
if (abs_locktime_is_seconds(t))
json_add_num(response, "second", abs_locktime_to_seconds(t));
else
json_add_num(response, "block", abs_locktime_to_blocks(t));
json_object_end(response);
}
static void json_add_htlcs(struct json_result *response,
const char *id,
struct peer *peer,
enum side owner)
{
struct htlc_map_iter it;
struct htlc *h;
const struct htlc_map *htlcs = &peer->htlcs;
json_array_start(response, id);
for (h = htlc_map_first(htlcs, &it); h; h = htlc_map_next(htlcs, &it)) {
if (htlc_owner(h) != owner)
continue;
/* Ignore completed HTLCs. */
if (htlc_is_dead(h))
continue;
json_object_start(response, NULL);
json_add_u64(response, "msatoshi", h->msatoshi);
json_add_abstime(response, "expiry", &h->expiry);
json_add_hex(response, "rhash", &h->rhash, sizeof(h->rhash));
json_add_string(response, "state", htlc_state_name(h->state));
json_object_end(response);
}
json_array_end(response);
}
/* FIXME: add history command which shows all prior and current commit txs */
/* FIXME: Somehow we should show running DNS lookups! */
static void json_getpeers(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *p;
struct json_result *response = new_json_result(cmd);
json_object_start(response, NULL);
json_array_start(response, "peers");
list_for_each(&cmd->dstate->peers, p, list) {
const struct channel_state *last;
json_object_start(response, NULL);
json_add_string(response, "name", log_prefix(p->log));
json_add_string(response, "state", state_name(p->state));
if (p->id)
json_add_pubkey(response, "peerid", p->id);
json_add_bool(response, "connected", p->connected);
/* FIXME: Report anchor. */
if (!p->local.commit || !p->local.commit->cstate) {
json_object_end(response);
continue;
}
last = p->local.commit->cstate;
json_add_num(response, "our_amount", last->side[LOCAL].pay_msat);
json_add_num(response, "our_fee", last->side[LOCAL].fee_msat);
json_add_num(response, "their_amount", last->side[REMOTE].pay_msat);
json_add_num(response, "their_fee", last->side[REMOTE].fee_msat);
json_add_htlcs(response, "our_htlcs", p, LOCAL);
json_add_htlcs(response, "their_htlcs", p, REMOTE);
json_object_end(response);
}
json_array_end(response);
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command getpeers_command = {
"getpeers",
json_getpeers,
"List the current peers",
"Returns a 'peers' array"
};
AUTODATA(json_command, &getpeers_command);
static void json_gethtlcs(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok, *resolvedtok;
bool resolved = false;
struct json_result *response = new_json_result(cmd);
struct htlc *h;
struct htlc_map_iter it;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
"?resolved", &resolvedtok,
NULL)) {
command_fail(cmd, "Need peerid");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (resolvedtok && !json_tok_bool(buffer, resolvedtok, &resolved)) {
command_fail(cmd, "resolved must be true or false");
return;
}
json_object_start(response, NULL);
json_array_start(response, "htlcs");
for (h = htlc_map_first(&peer->htlcs, &it);
h; h = htlc_map_next(&peer->htlcs, &it)) {
if (htlc_is_dead(h) && !resolved)
continue;
json_object_start(response, NULL);
json_add_u64(response, "id", h->id);
json_add_string(response, "state", htlc_state_name(h->state));
json_add_u64(response, "msatoshi", h->msatoshi);
json_add_abstime(response, "expiry", &h->expiry);
json_add_hex(response, "rhash", &h->rhash, sizeof(h->rhash));
if (h->r)
json_add_hex(response, "r", h->r, sizeof(*h->r));
if (htlc_owner(h) == LOCAL) {
json_add_num(response, "deadline", h->deadline);
if (h->src) {
json_object_start(response, "src");
json_add_pubkey(response,
"peerid", h->src->peer->id);
json_add_u64(response, "id", h->src->id);
json_object_end(response);
}
} else {
if (h->routing)
json_add_hex(response, "routing",
h->routing, tal_count(h->routing));
}
json_object_end(response);
}
json_array_end(response);
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command gethtlcs_command = {
"gethtlcs",
json_gethtlcs,
"List HTLCs for {peer}; all if {resolved} is true.",
"Returns a 'htlcs' array"
};
AUTODATA(json_command, &gethtlcs_command);
/* To avoid freeing underneath ourselves, we free outside event loop. */
void cleanup_peers(struct lightningd_state *dstate)
{
struct peer *peer, *next;
list_for_each_safe(&dstate->peers, peer, next, list) {
/* Deletes itself from list. */
if (!peer->conn && peer->state == STATE_CLOSED)
tal_free(peer);
}
}
static void json_newhtlc(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok, *msatoshitok, *expirytok, *rhashtok;
unsigned int expiry;
u64 msatoshi;
struct sha256 rhash;
struct json_result *response = new_json_result(cmd);
struct htlc *htlc;
const char *err;
enum fail_error error_code;
struct hoppayload *hoppayloads;
u8 sessionkey[32];
struct onionpacket *packet;
u8 *onion;
struct pubkey *path = tal_arrz(cmd, struct pubkey, 1);
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
"msatoshi", &msatoshitok,
"expiry", &expirytok,
"rhash", &rhashtok,
NULL)) {
command_fail(cmd, "Need peerid, msatoshi, expiry and rhash");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->remote.commit || !peer->remote.commit->cstate) {
command_fail(cmd, "peer not fully established");
return;
}
if (!peer->connected) {
command_fail(cmd, "peer not connected");
return;
}
if (!json_tok_u64(buffer, msatoshitok, &msatoshi)) {
command_fail(cmd, "'%.*s' is not a valid number",
(int)(msatoshitok->end - msatoshitok->start),
buffer + msatoshitok->start);
return;
}
if (!json_tok_number(buffer, expirytok, &expiry)) {
command_fail(cmd, "'%.*s' is not a valid number",
(int)(expirytok->end - expirytok->start),
buffer + expirytok->start);
return;
}
if (!hex_decode(buffer + rhashtok->start,
rhashtok->end - rhashtok->start,
&rhash, sizeof(rhash))) {
command_fail(cmd, "'%.*s' is not a valid sha256 hash",
(int)(rhashtok->end - rhashtok->start),
buffer + rhashtok->start);
return;
}
tal_arr(cmd, struct pubkey, 1);
hoppayloads = tal_arrz(cmd, struct hoppayload, 1);
memcpy(&path[0], peer->id, sizeof(struct pubkey));
randombytes_buf(&sessionkey, sizeof(sessionkey));
packet = create_onionpacket(cmd, path, hoppayloads, sessionkey,
rhash.u.u8, sizeof(rhash));
onion = serialize_onionpacket(cmd, packet);
log_debug(peer->log, "JSON command to add new HTLC");
err = command_htlc_add(peer, msatoshi, expiry, &rhash, NULL,
onion,
&error_code, &htlc);
if (err) {
command_fail(cmd, "could not add htlc: %u:%s", error_code, err);
return;
}
log_debug(peer->log, "JSON new HTLC is %"PRIu64, htlc->id);
json_object_start(response, NULL);
json_add_u64(response, "id", htlc->id);
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command dev_newhtlc_command = {
"dev-newhtlc",
json_newhtlc,
"Offer {peerid} an HTLC worth {msatoshi} in {expiry} (block number) with {rhash}",
"Returns { id: u64 } result on success"
};
AUTODATA(json_command, &dev_newhtlc_command);
static void json_fulfillhtlc(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok, *idtok, *rtok;
u64 id;
struct htlc *htlc;
struct sha256 rhash;
struct preimage r;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
"id", &idtok,
"r", &rtok,
NULL)) {
command_fail(cmd, "Need peerid, id and r");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->remote.commit || !peer->remote.commit->cstate) {
command_fail(cmd, "peer not fully established");
return;
}
if (!peer->connected) {
command_fail(cmd, "peer not connected");
return;
}
if (!json_tok_u64(buffer, idtok, &id)) {
command_fail(cmd, "'%.*s' is not a valid id",
(int)(idtok->end - idtok->start),
buffer + idtok->start);
return;
}
if (!hex_decode(buffer + rtok->start,
rtok->end - rtok->start,
&r, sizeof(r))) {
command_fail(cmd, "'%.*s' is not a valid sha256 preimage",
(int)(rtok->end - rtok->start),
buffer + rtok->start);
return;
}
htlc = htlc_get(&peer->htlcs, id, REMOTE);
if (!htlc) {
command_fail(cmd, "preimage htlc not found");
return;
}
if (htlc->state != RCVD_ADD_ACK_REVOCATION) {
command_fail(cmd, "htlc in state %s",
htlc_state_name(htlc->state));
return;
}
sha256(&rhash, &r, sizeof(r));
if (!structeq(&htlc->rhash, &rhash)) {
command_fail(cmd, "preimage incorrect");
return;
}
/* This can happen if we're disconnected, and thus haven't sent
* fulfill yet; we stored r in database immediately. */
if (!htlc->r) {
const char *db_err;
db_start_transaction(peer);
set_htlc_rval(peer, htlc, &r);
/* We can relay this upstream immediately. */
our_htlc_fulfilled(peer, htlc);
db_err = db_commit_transaction(peer);
if (db_err) {
command_fail(cmd, "%s", db_err);
return;
}
}
if (command_htlc_fulfill(peer, htlc))
command_success(cmd, null_response(cmd));
else
command_fail(cmd,
"htlc_fulfill not possible in state %s",
state_name(peer->state));
}
static const struct json_command dev_fulfillhtlc_command = {
"dev-fulfillhtlc",
json_fulfillhtlc,
"Redeem htlc proposed by {peerid} of {id} using {r}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_fulfillhtlc_command);
static void json_failhtlc(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok, *idtok, *reasontok;
u64 id;
struct htlc *htlc;
const char *db_err;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
"id", &idtok,
"reason", &reasontok,
NULL)) {
command_fail(cmd, "Need peerid, id and reason");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->remote.commit || !peer->remote.commit->cstate) {
command_fail(cmd, "peer not fully established");
return;
}
if (!peer->connected) {
command_fail(cmd, "peer not connected");
return;
}
if (!json_tok_u64(buffer, idtok, &id)) {
command_fail(cmd, "'%.*s' is not a valid id",
(int)(idtok->end - idtok->start),
buffer + idtok->start);
return;
}
htlc = htlc_get(&peer->htlcs, id, REMOTE);
if (!htlc) {
command_fail(cmd, "preimage htlc not found");
return;
}
if (htlc->state != RCVD_ADD_ACK_REVOCATION) {
command_fail(cmd, "htlc in state %s",
htlc_state_name(htlc->state));
return;
}
db_start_transaction(peer);
set_htlc_fail(peer, htlc, buffer + reasontok->start,
reasontok->end - reasontok->start);
db_err = db_commit_transaction(peer);
if (db_err) {
command_fail(cmd, "%s", db_err);
return;
}
if (command_htlc_fail(peer, htlc))
command_success(cmd, null_response(cmd));
else
command_fail(cmd,
"htlc_fail not possible in state %s",
state_name(peer->state));
}
static const struct json_command dev_failhtlc_command = {
"dev-failhtlc",
json_failhtlc,
"Fail htlc proposed by {peerid} which has {id}, using {reason}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_failhtlc_command);
static void json_commit(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
NULL)) {
command_fail(cmd, "Need peerid");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->remote.commit || !peer->remote.commit->cstate) {
command_fail(cmd, "peer not fully established");
return;
}
if (!peer->connected) {
command_fail(cmd, "peer not connected");
return;
}
if (!state_can_commit(peer->state)) {
command_fail(cmd, "peer in state %s", state_name(peer->state));
return;
}
do_commit(peer, cmd);
}
static const struct json_command dev_commit_command = {
"dev-commit",
json_commit,
"Commit all staged HTLC changes with {peerid}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_commit_command);
static void json_close(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
NULL)) {
command_fail(cmd, "Need peerid");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!state_is_normal(peer->state) && !state_is_opening(peer->state)) {
command_fail(cmd, "Peer is already closing: state %s",
state_name(peer->state));
return;
}
if (!peer_start_shutdown(peer)) {
command_fail(cmd, "Database error");
return;
}
/* FIXME: Block until closed! */
command_success(cmd, null_response(cmd));
}
static const struct json_command close_command = {
"close",
json_close,
"Close the channel with peer {peerid}",
"Returns an empty result on success"
};
AUTODATA(json_command, &close_command);
static void json_feerate(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
jsmntok_t *feeratetok;
u64 feerate;
if (!json_get_params(buffer, params,
"feerate", &feeratetok,
NULL)) {
command_fail(cmd, "Need feerate");
return;
}
if (!json_tok_u64(buffer, feeratetok, &feerate)) {
command_fail(cmd, "Invalid feerate");
return;
}
log_debug(cmd->jcon->log, "Fee rate changed to %"PRIu64, feerate);
cmd->dstate->topology->default_fee_rate = feerate;
command_success(cmd, null_response(cmd));
}
static const struct json_command dev_feerate_command = {
"dev-feerate",
json_feerate,
"Change the (default) fee rate to {feerate}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_feerate_command);
static void json_disconnect(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
NULL)) {
command_fail(cmd, "Need peerid");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->conn) {
command_fail(cmd, "Peer is already disconnected");
return;
}
/* We don't actually close it, since for testing we want only
* one side to freak out. We just ensure we ignore it. */
log_debug(peer->log, "Pretending connection is closed");
peer->fake_close = true;
peer->connected = false;
peer_fail(peer, __func__);
command_success(cmd, null_response(cmd));
}
static void json_reconnect(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
NULL)) {
command_fail(cmd, "Need peerid");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->conn) {
command_fail(cmd, "Peer is already disconnected");
return;
}
/* Should reconnect on its own. */
io_close(peer->conn);
command_success(cmd, null_response(cmd));
}
static void json_signcommit(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok;
u8 *linear;
struct json_result *response = new_json_result(cmd);
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
NULL)) {
command_fail(cmd, "Need peerid");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->local.commit->sig) {
command_fail(cmd, "Peer has not given us a signature");
return;
}
sign_commit_tx(peer);
linear = linearize_tx(cmd, peer->local.commit->tx);
/* Clear witness for potential future uses. */
peer->local.commit->tx->input[0].witness
= tal_free(peer->local.commit->tx->input[0].witness);
json_object_start(response, NULL);
json_add_string(response, "tx", tal_hex(cmd, linear));
json_object_end(response);
command_success(cmd, response);
}
static void json_output(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct peer *peer;
jsmntok_t *peeridtok, *enabletok;
bool enable;
if (!json_get_params(buffer, params,
"peerid", &peeridtok,
"enable", &enabletok,
NULL)) {
command_fail(cmd, "Need peerid and enable");
return;
}
peer = find_peer_json(cmd->dstate, buffer, peeridtok);
if (!peer) {
command_fail(cmd, "Could not find peer with that peerid");
return;
}
if (!peer->conn) {
command_fail(cmd, "Peer is already disconnected");
return;
}
if (!json_tok_bool(buffer, enabletok, &enable)) {
command_fail(cmd, "enable must be true or false");
return;
}
log_debug(peer->log, "dev-output: output %s",
enable ? "enabled" : "disabled");
peer->output_enabled = enable;
/* Flush any outstanding output */
if (peer->output_enabled)
io_wake(peer);
command_success(cmd, null_response(cmd));
}
static const struct json_command dev_output_command = {
"dev-output",
json_output,
"Enable/disable any messages to peer {peerid} depending on {enable}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_output_command);
static const struct json_command dev_disconnect_command = {
"dev-disconnect",
json_disconnect,
"Force a disconnect with peer {peerid}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_disconnect_command);
static const struct json_command dev_reconnect_command = {
"dev-reconnect",
json_reconnect,
"Force a reconnect with peer {peerid}",
"Returns an empty result on success"
};
AUTODATA(json_command, &dev_reconnect_command);
static const struct json_command dev_signcommit_command = {
"dev-signcommit",
json_signcommit,
"Sign and return the current commit with peer {peerid}",
"Returns a hex string on success"
};
AUTODATA(json_command, &dev_signcommit_command);