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#include <bitcoin/script.h>
#include <ccan/crypto/hkdf_sha256/hkdf_sha256.h>
#include <ccan/tal/str/str.h>
#include <common/wire_error.h>
#include <gossipd/gen_gossip_wire.h>
#include <inttypes.h>
#include <lightningd/channel.h>
#include <lightningd/gen_channel_state_names.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <lightningd/peer_control.h>
#include <lightningd/subd.h>
void channel_set_owner(struct channel *channel, struct subd *owner)
{
struct subd *old_owner = channel->owner;
channel->owner = owner;
if (old_owner)
subd_release_channel(old_owner, channel);
}
struct htlc_out *channel_has_htlc_out(struct channel *channel)
{
struct htlc_out_map_iter outi;
struct htlc_out *hout;
struct lightningd *ld = channel->peer->ld;
for (hout = htlc_out_map_first(&ld->htlcs_out, &outi);
hout;
hout = htlc_out_map_next(&ld->htlcs_out, &outi)) {
if (hout->key.channel == channel)
return hout;
}
return NULL;
}
struct htlc_in *channel_has_htlc_in(struct channel *channel)
{
struct htlc_in_map_iter ini;
struct htlc_in *hin;
struct lightningd *ld = channel->peer->ld;
for (hin = htlc_in_map_first(&ld->htlcs_in, &ini);
hin;
hin = htlc_in_map_next(&ld->htlcs_in, &ini)) {
if (hin->key.channel == channel)
return hin;
}
return NULL;
}
static void destroy_channel(struct channel *channel)
{
/* Must not have any HTLCs! */
struct htlc_out *hout = channel_has_htlc_out(channel);
struct htlc_in *hin = channel_has_htlc_in(channel);
if (hout)
fatal("Freeing channel %s has hout %s",
channel_state_name(channel),
htlc_state_name(hout->hstate));
if (hin)
fatal("Freeing channel %s has hin %s",
channel_state_name(channel),
htlc_state_name(hin->hstate));
/* Free any old owner still hanging around. */
channel_set_owner(channel, NULL);
list_del_from(&channel->peer->channels, &channel->list);
}
void delete_channel(struct channel *channel)
{
struct peer *peer = channel->peer;
wallet_channel_delete(channel->peer->ld->wallet, channel->dbid);
tal_free(channel);
/* Last one out frees the peer */
if (list_empty(&peer->channels) && !peer->uncommitted_channel)
delete_peer(peer);
}
/* FIXME: We have no business knowing this! */
/**
* derive_channel_seed - Generate a unique secret for this peer's channel
*
* @ld: the lightning daemon to get global secret from
* @seed: where to store the generated secret
* @peer_id: the id node_id of the remote peer
* @dbid: channel DBID
*
* This method generates a unique secret from the given parameters. It
* is important that this secret be unique for each channel, but it
* must be reproducible for the same channel in case of
* reconnection. We use the DB channel ID to guarantee unique secrets
* per channel.
*/
void derive_channel_seed(struct lightningd *ld, struct privkey *seed,
const struct pubkey *peer_id,
const u64 dbid)
{
u8 input[PUBKEY_DER_LEN + sizeof(dbid)];
char *info = "per-peer seed";
pubkey_to_der(input, peer_id);
memcpy(input + PUBKEY_DER_LEN, &dbid, sizeof(dbid));
assert(dbid != 0);
hkdf_sha256(seed, sizeof(*seed),
input, sizeof(input),
&ld->peer_seed, sizeof(ld->peer_seed),
info, strlen(info));
}
struct channel *new_channel(struct peer *peer, u64 dbid,
/* NULL or stolen */
struct wallet_shachain *their_shachain,
enum channel_state state,
enum side funder,
/* NULL or stolen */
struct log *log,
const char *transient_billboard TAKES,
u8 channel_flags,
const struct channel_config *our_config,
u32 minimum_depth,
u64 next_index_local,
u64 next_index_remote,
u64 next_htlc_id,
const struct bitcoin_txid *funding_txid,
u16 funding_outnum,
u64 funding_satoshi,
u64 push_msat,
bool remote_funding_locked,
/* NULL or stolen */
struct short_channel_id *scid,
u64 our_msatoshi,
u64 msatoshi_to_us_min,
u64 msatoshi_to_us_max,
/* Stolen */
struct bitcoin_tx *last_tx,
const secp256k1_ecdsa_signature *last_sig,
/* NULL or stolen */
secp256k1_ecdsa_signature *last_htlc_sigs,
const struct channel_info *channel_info,
/* NULL or stolen */
u8 *remote_shutdown_scriptpubkey,
u64 final_key_idx,
bool last_was_revoke,
/* NULL or stolen */
struct changed_htlc *last_sent_commit,
u32 first_blocknum,
u32 min_possible_feerate,
u32 max_possible_feerate)
{
struct channel *channel = tal(peer->ld, struct channel);
assert(dbid != 0);
channel->peer = peer;
channel->dbid = dbid;
channel->error = NULL;
if (their_shachain)
channel->their_shachain = *their_shachain;
else {
channel->their_shachain.id = 0;
shachain_init(&channel->their_shachain.chain);
}
channel->state = state;
channel->funder = funder;
channel->owner = NULL;
memset(&channel->billboard, 0, sizeof(channel->billboard));
channel->billboard.transient = tal_strdup(channel, transient_billboard);
if (!log) {
/* FIXME: update log prefix when we get scid */
/* FIXME: Use minimal unique pubkey prefix for logs! */
char *idname = type_to_string(peer, struct pubkey, &peer->id);
channel->log = new_log(channel,
peer->log_book, "%s chan #%"PRIu64":",
idname, dbid);
tal_free(idname);
} else
channel->log = tal_steal(channel, log);
channel->channel_flags = channel_flags;
channel->our_config = *our_config;
channel->minimum_depth = minimum_depth;
channel->next_index[LOCAL] = next_index_local;
channel->next_index[REMOTE] = next_index_remote;
channel->next_htlc_id = next_htlc_id;
channel->funding_txid = *funding_txid;
channel->funding_outnum = funding_outnum;
channel->funding_satoshi = funding_satoshi;
channel->push_msat = push_msat;
channel->remote_funding_locked = remote_funding_locked;
channel->scid = tal_steal(channel, scid);
channel->our_msatoshi = our_msatoshi;
channel->msatoshi_to_us_min = msatoshi_to_us_min;
channel->msatoshi_to_us_max = msatoshi_to_us_max;
channel->last_tx = tal_steal(channel, last_tx);
channel->last_sig = *last_sig;
channel->last_htlc_sigs = tal_steal(channel, last_htlc_sigs);
channel->channel_info = *channel_info;
channel->remote_shutdown_scriptpubkey
= tal_steal(channel, remote_shutdown_scriptpubkey);
channel->final_key_idx = final_key_idx;
channel->last_was_revoke = last_was_revoke;
channel->last_sent_commit = tal_steal(channel, last_sent_commit);
channel->first_blocknum = first_blocknum;
channel->min_possible_feerate = min_possible_feerate;
channel->max_possible_feerate = max_possible_feerate;
derive_channel_seed(peer->ld, &channel->seed, &peer->id, channel->dbid);
list_add_tail(&peer->channels, &channel->list);
tal_add_destructor(channel, destroy_channel);
/* Make sure we see any spends using this key */
txfilter_add_scriptpubkey(peer->ld->owned_txfilter,
take(p2wpkh_for_keyidx(NULL, peer->ld,
channel->final_key_idx)));
return channel;
}
const char *channel_state_name(const struct channel *channel)
{
return channel_state_str(channel->state);
}
const char *channel_state_str(enum channel_state state)
{
for (size_t i = 0; enum_channel_state_names[i].name; i++)
if (enum_channel_state_names[i].v == state)
return enum_channel_state_names[i].name;
return "unknown";
}
struct channel *peer_active_channel(struct peer *peer)
{
struct channel *channel;
list_for_each(&peer->channels, channel, list) {
if (channel_active(channel))
return channel;
}
return NULL;
}
struct channel *active_channel_by_id(struct lightningd *ld,
const struct pubkey *id,
struct uncommitted_channel **uc)
{
struct peer *peer = peer_by_id(ld, id);
if (!peer) {
if (uc)
*uc = NULL;
return NULL;
}
if (uc)
*uc = peer->uncommitted_channel;
return peer_active_channel(peer);
}
void channel_set_last_tx(struct channel *channel,
struct bitcoin_tx *tx,
const secp256k1_ecdsa_signature *sig)
{
channel->last_sig = *sig;
tal_free(channel->last_tx);
channel->last_tx = tal_steal(channel, tx);
}
void channel_set_state(struct channel *channel,
enum channel_state old_state,
enum channel_state state)
{
log_info(channel->log, "State changed from %s to %s",
channel_state_name(channel), channel_state_str(state));
if (channel->state != old_state)
fatal("channel state %s should be %s",
channel_state_name(channel), channel_state_str(old_state));
channel->state = state;
/* TODO(cdecker) Selectively save updated fields to DB */
wallet_channel_save(channel->peer->ld->wallet, channel);
}
void channel_fail_permanent(struct channel *channel, const char *fmt, ...)
{
struct lightningd *ld = channel->peer->ld;
va_list ap;
char *why;
struct channel_id cid;
va_start(ap, fmt);
why = tal_vfmt(channel, fmt, ap);
va_end(ap);
if (channel->scid) {
u8 *msg = towire_gossip_disable_channel(NULL,
channel->scid,
channel->peer->direction,
false);
subd_send_msg(ld->gossip, take(msg));
}
log_unusual(channel->log, "Peer permanent failure in %s: %s",
channel_state_name(channel), why);
/* We can have multiple errors, eg. onchaind failures. */
if (!channel->error) {
derive_channel_id(&cid,
&channel->funding_txid,
channel->funding_outnum);
channel->error = towire_errorfmt(channel, &cid, "%s", why);
}
channel_set_owner(channel, NULL);
/* Drop non-cooperatively (unilateral) to chain. */
drop_to_chain(ld, channel, false);
tal_free(why);
}
void channel_internal_error(struct channel *channel, const char *fmt, ...)
{
va_list ap;
char *why;
va_start(ap, fmt);
why = tal_vfmt(channel, fmt, ap);
va_end(ap);
log_broken(channel->log, "Peer internal error %s: %s",
channel_state_name(channel), why);
/* Don't expose internal error causes to remove unless doing dev */
#if DEVELOPER
channel_fail_permanent(channel, "Internal error: %s", why);
#else
channel_fail_permanent(channel, "Internal error");
#endif
tal_free(why);
}
void channel_set_billboard(struct channel *channel, bool perm, const char *str)
{
const char **p;
if (perm)
p = &channel->billboard.permanent[channel->state];
else
p = &channel->billboard.transient;
*p = tal_free(*p);
if (str) {
*p = tal_fmt(channel, "%s:%s", channel_state_name(channel), str);
if (taken(str))
tal_free(str);
}
}
void channel_fail_transient(struct channel *channel, const char *fmt, ...)
{
va_list ap;
const char *why;
va_start(ap, fmt);
why = tal_vfmt(channel, fmt, ap);
va_end(ap);
log_info(channel->log, "Peer transient failure in %s: %s",
channel_state_name(channel), why);
tal_free(why);
#if DEVELOPER
if (dev_disconnect_permanent(channel->peer->ld)) {
channel_internal_error(channel, "dev_disconnect permfail");
return;
}
#endif
channel_set_owner(channel, NULL);
/* Reconnect unless we've dropped/are dropping to chain. */
if (channel_active(channel))
try_reconnect(channel->peer);
}