mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 18:11:28 +01:00
422b4502d3
Takes advantage of upfront-shutdown-script to permit users to specify the close-to address for a channel at open, by adding a `close_to` field to `fundchannel_start`. Note that this only is in effect if `fundchannel_start` returns with `close_to` set -- otherwise, peer doesn't support `option_upfront_shutdown_script`.
506 lines
14 KiB
C
506 lines
14 KiB
C
#include <bitcoin/script.h>
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#include <ccan/crypto/hkdf_sha256/hkdf_sha256.h>
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#include <ccan/tal/str/str.h>
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#include <common/json_command.h>
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#include <common/jsonrpc_errors.h>
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#include <common/wire_error.h>
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#include <connectd/gen_connect_wire.h>
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#include <errno.h>
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#include <hsmd/gen_hsm_wire.h>
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#include <inttypes.h>
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#include <lightningd/channel.h>
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#include <lightningd/connect_control.h>
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#include <lightningd/gen_channel_state_names.h>
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#include <lightningd/hsm_control.h>
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#include <lightningd/jsonrpc.h>
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#include <lightningd/lightningd.h>
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#include <lightningd/log.h>
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#include <lightningd/opening_control.h>
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#include <lightningd/peer_control.h>
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#include <lightningd/subd.h>
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#include <wire/wire_sync.h>
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static bool connects_to_peer(struct subd *owner)
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{
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return owner && owner->talks_to_peer;
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}
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void channel_set_owner(struct channel *channel, struct subd *owner)
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{
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struct subd *old_owner = channel->owner;
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channel->owner = owner;
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if (old_owner) {
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subd_release_channel(old_owner, channel);
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if (channel->connected && !connects_to_peer(owner)) {
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/* If shutting down, connectd no longer exists,
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* and we should not transfer peer to connectd.
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* Only transfer to connectd if connectd is
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* there to be transferred to.
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*/
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if (channel->peer->ld->connectd) {
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u8 *msg;
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msg = towire_connectctl_peer_disconnected(
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NULL,
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&channel->peer->id);
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subd_send_msg(channel->peer->ld->connectd,
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take(msg));
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}
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}
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}
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channel->connected = connects_to_peer(owner);
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}
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struct htlc_out *channel_has_htlc_out(struct channel *channel)
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{
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struct htlc_out_map_iter outi;
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struct htlc_out *hout;
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struct lightningd *ld = channel->peer->ld;
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for (hout = htlc_out_map_first(&ld->htlcs_out, &outi);
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hout;
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hout = htlc_out_map_next(&ld->htlcs_out, &outi)) {
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if (hout->key.channel == channel)
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return hout;
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}
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return NULL;
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}
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struct htlc_in *channel_has_htlc_in(struct channel *channel)
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{
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struct htlc_in_map_iter ini;
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struct htlc_in *hin;
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struct lightningd *ld = channel->peer->ld;
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for (hin = htlc_in_map_first(&ld->htlcs_in, &ini);
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hin;
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hin = htlc_in_map_next(&ld->htlcs_in, &ini)) {
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if (hin->key.channel == channel)
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return hin;
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}
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return NULL;
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}
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static void destroy_channel(struct channel *channel)
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{
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/* Must not have any HTLCs! */
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struct htlc_out *hout = channel_has_htlc_out(channel);
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struct htlc_in *hin = channel_has_htlc_in(channel);
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if (hout)
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fatal("Freeing channel %s has hout %s",
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channel_state_name(channel),
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htlc_state_name(hout->hstate));
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if (hin)
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fatal("Freeing channel %s has hin %s",
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channel_state_name(channel),
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htlc_state_name(hin->hstate));
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for (size_t i = 0; i < tal_count(channel->forgets); i++)
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was_pending(command_fail(channel->forgets[i], LIGHTNINGD,
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"Channel structure was freed!"));
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/* Free any old owner still hanging around. */
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channel_set_owner(channel, NULL);
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list_del_from(&channel->peer->channels, &channel->list);
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}
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void delete_channel(struct channel *channel)
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{
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struct peer *peer = channel->peer;
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wallet_channel_close(channel->peer->ld->wallet, channel->dbid);
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tal_free(channel);
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maybe_delete_peer(peer);
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}
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void get_channel_basepoints(struct lightningd *ld,
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const struct node_id *peer_id,
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const u64 dbid,
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struct basepoints *local_basepoints,
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struct pubkey *local_funding_pubkey)
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{
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u8 *msg;
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assert(dbid != 0);
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msg = towire_hsm_get_channel_basepoints(NULL, peer_id, dbid);
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if (!wire_sync_write(ld->hsm_fd, take(msg)))
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fatal("Could not write to HSM: %s", strerror(errno));
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msg = wire_sync_read(tmpctx, ld->hsm_fd);
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if (!fromwire_hsm_get_channel_basepoints_reply(msg, local_basepoints,
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local_funding_pubkey))
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fatal("HSM gave bad hsm_get_channel_basepoints_reply %s",
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tal_hex(msg, msg));
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}
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struct channel *new_channel(struct peer *peer, u64 dbid,
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/* NULL or stolen */
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struct wallet_shachain *their_shachain,
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enum channel_state state,
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enum side funder,
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/* NULL or stolen */
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struct log *log,
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const char *transient_billboard TAKES,
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u8 channel_flags,
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const struct channel_config *our_config,
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u32 minimum_depth,
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u64 next_index_local,
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u64 next_index_remote,
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u64 next_htlc_id,
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const struct bitcoin_txid *funding_txid,
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u16 funding_outnum,
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struct amount_sat funding,
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struct amount_msat push,
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bool remote_funding_locked,
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/* NULL or stolen */
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struct short_channel_id *scid,
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struct amount_msat our_msat,
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struct amount_msat msat_to_us_min,
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struct amount_msat msat_to_us_max,
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/* Stolen */
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struct bitcoin_tx *last_tx,
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const struct bitcoin_signature *last_sig,
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/* NULL or stolen */
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secp256k1_ecdsa_signature *last_htlc_sigs,
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const struct channel_info *channel_info,
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/* NULL or stolen */
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u8 *remote_shutdown_scriptpubkey,
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const u8 *local_shutdown_scriptpubkey,
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u64 final_key_idx,
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bool last_was_revoke,
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/* NULL or stolen */
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struct changed_htlc *last_sent_commit,
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u32 first_blocknum,
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u32 min_possible_feerate,
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u32 max_possible_feerate,
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bool connected,
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const struct basepoints *local_basepoints,
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const struct pubkey *local_funding_pubkey,
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const struct pubkey *future_per_commitment_point,
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u32 feerate_base,
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u32 feerate_ppm,
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const u8 *remote_upfront_shutdown_script,
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bool option_static_remotekey)
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{
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struct channel *channel = tal(peer->ld, struct channel);
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assert(dbid != 0);
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channel->peer = peer;
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channel->dbid = dbid;
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channel->error = NULL;
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channel->htlc_timeout = NULL;
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if (their_shachain)
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channel->their_shachain = *their_shachain;
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else {
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channel->their_shachain.id = 0;
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shachain_init(&channel->their_shachain.chain);
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}
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channel->state = state;
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channel->funder = funder;
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channel->owner = NULL;
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memset(&channel->billboard, 0, sizeof(channel->billboard));
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channel->billboard.transient = tal_strdup(channel, transient_billboard);
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if (!log) {
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/* FIXME: update log prefix when we get scid */
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/* FIXME: Use minimal unique pubkey prefix for logs! */
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const char *idname = type_to_string(peer,
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struct node_id,
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&peer->id);
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channel->log = new_log(channel,
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peer->log_book, "%s chan #%"PRIu64":",
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idname, dbid);
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tal_free(idname);
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} else
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channel->log = tal_steal(channel, log);
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channel->channel_flags = channel_flags;
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channel->our_config = *our_config;
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channel->minimum_depth = minimum_depth;
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channel->next_index[LOCAL] = next_index_local;
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channel->next_index[REMOTE] = next_index_remote;
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channel->next_htlc_id = next_htlc_id;
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channel->funding_txid = *funding_txid;
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channel->funding_outnum = funding_outnum;
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channel->funding = funding;
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channel->push = push;
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channel->remote_funding_locked = remote_funding_locked;
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channel->scid = tal_steal(channel, scid);
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channel->our_msat = our_msat;
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channel->msat_to_us_min = msat_to_us_min;
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channel->msat_to_us_max = msat_to_us_max;
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channel->last_tx = tal_steal(channel, last_tx);
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channel->last_tx->chainparams = get_chainparams(peer->ld);
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channel->last_tx_type = TX_UNKNOWN;
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channel->last_sig = *last_sig;
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channel->last_htlc_sigs = tal_steal(channel, last_htlc_sigs);
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channel->channel_info = *channel_info;
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channel->shutdown_scriptpubkey[REMOTE]
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= tal_steal(channel, remote_shutdown_scriptpubkey);
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channel->final_key_idx = final_key_idx;
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if (local_shutdown_scriptpubkey)
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channel->shutdown_scriptpubkey[LOCAL]
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= tal_steal(channel, local_shutdown_scriptpubkey);
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else
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channel->shutdown_scriptpubkey[LOCAL]
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= p2wpkh_for_keyidx(channel, channel->peer->ld,
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channel->final_key_idx);
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channel->last_was_revoke = last_was_revoke;
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channel->last_sent_commit = tal_steal(channel, last_sent_commit);
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channel->first_blocknum = first_blocknum;
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channel->min_possible_feerate = min_possible_feerate;
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channel->max_possible_feerate = max_possible_feerate;
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channel->connected = connected;
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channel->local_basepoints = *local_basepoints;
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channel->local_funding_pubkey = *local_funding_pubkey;
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channel->future_per_commitment_point
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= tal_steal(channel, future_per_commitment_point);
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channel->feerate_base = feerate_base;
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channel->feerate_ppm = feerate_ppm;
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channel->remote_upfront_shutdown_script
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= tal_steal(channel, remote_upfront_shutdown_script);
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channel->option_static_remotekey = option_static_remotekey;
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channel->forgets = tal_arr(channel, struct command *, 0);
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list_add_tail(&peer->channels, &channel->list);
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tal_add_destructor(channel, destroy_channel);
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/* Make sure we see any spends using this key */
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txfilter_add_scriptpubkey(peer->ld->owned_txfilter,
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take(p2wpkh_for_keyidx(NULL, peer->ld,
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channel->final_key_idx)));
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return channel;
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}
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const char *channel_state_name(const struct channel *channel)
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{
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return channel_state_str(channel->state);
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}
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const char *channel_state_str(enum channel_state state)
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{
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for (size_t i = 0; enum_channel_state_names[i].name; i++)
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if (enum_channel_state_names[i].v == state)
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return enum_channel_state_names[i].name;
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return "unknown";
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}
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struct channel *peer_active_channel(struct peer *peer)
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{
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struct channel *channel;
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list_for_each(&peer->channels, channel, list) {
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if (channel_active(channel))
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return channel;
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}
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return NULL;
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}
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struct channel *peer_normal_channel(struct peer *peer)
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{
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struct channel *channel;
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list_for_each(&peer->channels, channel, list) {
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if (channel->state == CHANNELD_NORMAL)
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return channel;
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}
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return NULL;
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}
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struct channel *active_channel_by_id(struct lightningd *ld,
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const struct node_id *id,
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struct uncommitted_channel **uc)
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{
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struct peer *peer = peer_by_id(ld, id);
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if (!peer) {
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if (uc)
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*uc = NULL;
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return NULL;
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}
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if (uc)
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*uc = peer->uncommitted_channel;
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return peer_active_channel(peer);
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}
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struct channel *channel_by_dbid(struct lightningd *ld, const u64 dbid)
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{
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struct peer *p;
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struct channel *chan;
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list_for_each(&ld->peers, p, list) {
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list_for_each(&p->channels, chan, list) {
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if (chan->dbid == dbid)
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return chan;
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}
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}
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return NULL;
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}
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void channel_set_last_tx(struct channel *channel,
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struct bitcoin_tx *tx,
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const struct bitcoin_signature *sig,
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enum wallet_tx_type txtypes)
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{
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assert(tx->chainparams);
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channel->last_sig = *sig;
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tal_free(channel->last_tx);
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channel->last_tx = tal_steal(channel, tx);
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channel->last_tx_type = txtypes;
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}
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void channel_set_state(struct channel *channel,
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enum channel_state old_state,
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enum channel_state state)
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{
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log_info(channel->log, "State changed from %s to %s",
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channel_state_name(channel), channel_state_str(state));
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if (channel->state != old_state)
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fatal("channel state %s should be %s",
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channel_state_name(channel), channel_state_str(old_state));
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channel->state = state;
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/* TODO(cdecker) Selectively save updated fields to DB */
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wallet_channel_save(channel->peer->ld->wallet, channel);
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}
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void channel_fail_permanent(struct channel *channel, const char *fmt, ...)
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{
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struct lightningd *ld = channel->peer->ld;
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va_list ap;
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char *why;
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struct channel_id cid;
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va_start(ap, fmt);
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why = tal_vfmt(tmpctx, fmt, ap);
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va_end(ap);
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log_unusual(channel->log, "Peer permanent failure in %s: %s",
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channel_state_name(channel), why);
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/* We can have multiple errors, eg. onchaind failures. */
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if (!channel->error) {
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derive_channel_id(&cid,
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&channel->funding_txid,
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channel->funding_outnum);
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channel->error = towire_errorfmt(channel, &cid, "%s", why);
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}
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channel_set_owner(channel, NULL);
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/* Drop non-cooperatively (unilateral) to chain. */
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drop_to_chain(ld, channel, false);
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if (channel_active(channel))
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channel_set_state(channel, channel->state, AWAITING_UNILATERAL);
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tal_free(why);
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}
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void channel_fail_forget(struct channel *channel, const char *fmt, ...)
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{
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va_list ap;
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char *why;
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struct channel_id cid;
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assert(channel->funder == REMOTE &&
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channel->state == CHANNELD_AWAITING_LOCKIN);
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va_start(ap, fmt);
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why = tal_vfmt(tmpctx, fmt, ap);
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va_end(ap);
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log_unusual(channel->log, "Peer permanent failure in %s: %s, "
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"forget channel",
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channel_state_name(channel), why);
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if (!channel->error) {
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derive_channel_id(&cid,
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&channel->funding_txid,
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channel->funding_outnum);
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channel->error = towire_errorfmt(channel, &cid, "%s", why);
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}
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delete_channel(channel);
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tal_free(why);
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}
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void channel_internal_error(struct channel *channel, const char *fmt, ...)
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{
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va_list ap;
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char *why;
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va_start(ap, fmt);
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why = tal_vfmt(channel, fmt, ap);
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va_end(ap);
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log_broken(channel->log, "Peer internal error %s: %s",
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channel_state_name(channel), why);
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/* Don't expose internal error causes to remove unless doing dev */
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#if DEVELOPER
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channel_fail_permanent(channel, "Internal error: %s", why);
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#else
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channel_fail_permanent(channel, "Internal error");
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#endif
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tal_free(why);
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}
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void channel_set_billboard(struct channel *channel, bool perm, const char *str)
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{
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const char **p;
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if (perm)
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p = &channel->billboard.permanent[channel->state];
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else
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p = &channel->billboard.transient;
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*p = tal_free(*p);
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if (str) {
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*p = tal_fmt(channel, "%s:%s", channel_state_name(channel), str);
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if (taken(str))
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tal_free(str);
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}
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}
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static void err_and_reconnect(struct channel *channel,
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const char *why,
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u32 seconds_before_reconnect)
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{
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log_info(channel->log, "Peer transient failure in %s: %s",
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channel_state_name(channel), why);
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#if DEVELOPER
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if (dev_disconnect_permanent(channel->peer->ld)) {
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channel_fail_permanent(channel, "dev_disconnect permfail");
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return;
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}
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#endif
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channel_set_owner(channel, NULL);
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delay_then_reconnect(channel, seconds_before_reconnect,
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&channel->peer->addr);
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}
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void channel_fail_reconnect_later(struct channel *channel, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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err_and_reconnect(channel, tal_vfmt(tmpctx, fmt, ap), 60);
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va_end(ap);
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}
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void channel_fail_reconnect(struct channel *channel, const char *fmt, ...)
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{
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|
va_list ap;
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|
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va_start(ap, fmt);
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err_and_reconnect(channel, tal_vfmt(tmpctx, fmt, ap), 1);
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va_end(ap);
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}
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