#include "lightningd.h" #include "peer_control.h" #include "subd.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct close_command { /* Inside struct lightningd close_commands. */ struct list_node list; /* Command structure. This is the parent of the close command. */ struct command *cmd; /* Channel being closed. */ struct channel *channel; /* Should we force the close on timeout? */ bool force; }; static void destroy_peer(struct peer *peer) { list_del_from(&peer->ld->peers, &peer->list); } /* We copy per-peer entries above --log-level into the main log. */ static void copy_to_parent_log(const char *prefix, enum log_level level, bool continued, const struct timeabs *time UNUSED, const char *str, const u8 *io, struct log *parent_log) { if (level == LOG_IO_IN || level == LOG_IO_OUT) log_io(parent_log, level, prefix, io, tal_count(io)); else if (continued) log_add(parent_log, "%s ... %s", prefix, str); else log_(parent_log, level, "%s %s", prefix, str); } static void peer_update_features(struct peer *peer, const u8 *globalfeatures TAKES, const u8 *localfeatures TAKES) { tal_free(peer->globalfeatures); tal_free(peer->localfeatures); peer->globalfeatures = tal_dup_arr(peer, u8, globalfeatures, tal_count(globalfeatures), 0); peer->localfeatures = tal_dup_arr(peer, u8, localfeatures, tal_count(localfeatures), 0); } struct peer *new_peer(struct lightningd *ld, u64 dbid, const struct pubkey *id, const struct wireaddr_internal *addr) { /* We are owned by our channels, and freed manually by destroy_channel */ struct peer *peer = tal(NULL, struct peer); peer->ld = ld; peer->dbid = dbid; peer->id = *id; peer->uncommitted_channel = NULL; peer->addr = *addr; peer->globalfeatures = peer->localfeatures = NULL; list_head_init(&peer->channels); peer->direction = get_channel_direction(&peer->ld->id, &peer->id); #if DEVELOPER peer->ignore_htlcs = false; #endif /* Max 128k per peer. */ peer->log_book = new_log_book(128*1024, get_log_level(ld->log_book)); set_log_outfn(peer->log_book, copy_to_parent_log, ld->log); list_add_tail(&ld->peers, &peer->list); tal_add_destructor(peer, destroy_peer); return peer; } static void delete_peer(struct peer *peer) { assert(list_empty(&peer->channels)); assert(!peer->uncommitted_channel); /* If it only ever existed because of uncommitted channel, it won't * be in the database */ if (peer->dbid != 0) wallet_peer_delete(peer->ld->wallet, peer->dbid); tal_free(peer); } /* Last one out deletes peer. */ void maybe_delete_peer(struct peer *peer) { if (!list_empty(&peer->channels)) return; if (peer->uncommitted_channel) { /* This isn't sufficient to keep it in db! */ if (peer->dbid != 0) { wallet_peer_delete(peer->ld->wallet, peer->dbid); peer->dbid = 0; } return; } delete_peer(peer); } struct peer *find_peer_by_dbid(struct lightningd *ld, u64 dbid) { struct peer *p; list_for_each(&ld->peers, p, list) if (p->dbid == dbid) return p; return NULL; } struct peer *peer_by_id(struct lightningd *ld, const struct pubkey *id) { struct peer *p; list_for_each(&ld->peers, p, list) if (pubkey_eq(&p->id, id)) return p; return NULL; } struct peer *peer_from_json(struct lightningd *ld, const char *buffer, const jsmntok_t *peeridtok) { struct pubkey peerid; if (!json_to_pubkey(buffer, peeridtok, &peerid)) return NULL; return peer_by_id(ld, &peerid); } u8 *p2wpkh_for_keyidx(const tal_t *ctx, struct lightningd *ld, u64 keyidx) { struct pubkey shutdownkey; if (!bip32_pubkey(ld->wallet->bip32_base, &shutdownkey, keyidx)) return NULL; return scriptpubkey_p2wpkh(ctx, &shutdownkey); } static void sign_last_tx(struct channel *channel) { struct lightningd *ld = channel->peer->ld; struct bitcoin_signature sig; u8 *msg; assert(!channel->last_tx->input[0].witness); msg = towire_hsm_sign_commitment_tx(tmpctx, &channel->peer->id, channel->dbid, channel->last_tx, &channel->channel_info .remote_fundingkey, channel->funding); if (!wire_sync_write(ld->hsm_fd, take(msg))) fatal("Could not write to HSM: %s", strerror(errno)); msg = wire_sync_read(tmpctx, ld->hsm_fd); if (!fromwire_hsm_sign_commitment_tx_reply(msg, &sig)) fatal("HSM gave bad sign_commitment_tx_reply %s", tal_hex(tmpctx, msg)); channel->last_tx->input[0].witness = bitcoin_witness_2of2(channel->last_tx->input, &channel->last_sig, &sig, &channel->channel_info.remote_fundingkey, &channel->local_funding_pubkey); } static void remove_sig(struct bitcoin_tx *signed_tx) { signed_tx->input[0].witness = tal_free(signed_tx->input[0].witness); } /* Resolve a single close command. */ static void resolve_one_close_command(struct close_command *cc, bool cooperative) { struct json_stream *result = json_stream_success(cc->cmd); u8 *tx = linearize_tx(result, cc->channel->last_tx); struct bitcoin_txid txid; bitcoin_txid(cc->channel->last_tx, &txid); json_object_start(result, NULL); json_add_hex_talarr(result, "tx", tx); json_add_txid(result, "txid", &txid); if (cooperative) json_add_string(result, "type", "mutual"); else json_add_string(result, "type", "unilateral"); json_object_end(result); was_pending(command_success(cc->cmd, result)); } /* Resolve a close command for a channel that will be closed soon. */ static void resolve_close_command(struct lightningd *ld, struct channel *channel, bool cooperative) { struct close_command *cc; struct close_command *n; list_for_each_safe (&ld->close_commands, cc, n, list) { if (cc->channel != channel) continue; resolve_one_close_command(cc, cooperative); } } /* Destroy the close command structure in reaction to the * channel being destroyed. */ static void destroy_close_command_on_channel_destroy(struct channel *_ UNUSED, struct close_command *cc) { /* The cc has the command as parent, so resolving the * command destroys the cc and triggers destroy_close_command. * Clear the cc->channel first so that we will not try to * remove a destructor. */ cc->channel = NULL; was_pending(command_fail(cc->cmd, LIGHTNINGD, "Channel forgotten before proper close.")); } /* Destroy the close command structure. */ static void destroy_close_command(struct close_command *cc) { list_del(&cc->list); /* If destroy_close_command_on_channel_destroy was * triggered beforehand, it will have cleared * the channel field, preventing us from removing it * from an already-destroyed channel. */ if (!cc->channel) return; tal_del_destructor2(cc->channel, &destroy_close_command_on_channel_destroy, cc); } /* Handle timeout. */ static void close_command_timeout(struct close_command *cc) { if (cc->force) /* This will trigger drop_to_chain, which will trigger * resolution of the command and destruction of the * close_command. */ channel_fail_permanent(cc->channel, "Forcibly closed by 'close' command timeout"); else /* Fail the command directly, which will resolve the * command and destroy the close_command. */ was_pending(command_fail(cc->cmd, LIGHTNINGD, "Channel close negotiation not finished " "before timeout")); } /* Construct a close command structure and add to ld. */ static void register_close_command(struct lightningd *ld, struct command *cmd, struct channel *channel, unsigned int timeout, bool force) { struct close_command *cc; assert(channel); cc = tal(cmd, struct close_command); list_add_tail(&ld->close_commands, &cc->list); cc->cmd = cmd; cc->channel = channel; cc->force = force; tal_add_destructor(cc, &destroy_close_command); tal_add_destructor2(channel, &destroy_close_command_on_channel_destroy, cc); new_reltimer(&ld->timers, cc, time_from_sec(timeout), &close_command_timeout, cc); } void drop_to_chain(struct lightningd *ld, struct channel *channel, bool cooperative) { /* BOLT #2: * * - if `next_remote_revocation_number` is greater than expected * above, AND `your_last_per_commitment_secret` is correct for that * `next_remote_revocation_number` minus 1: * - MUST NOT broadcast its commitment transaction. */ if (channel->future_per_commitment_point && !cooperative) { log_broken(channel->log, "Cannot broadcast our commitment tx:" " they have a future one"); } else { sign_last_tx(channel); /* Keep broadcasting until we say stop (can fail due to dup, * if they beat us to the broadcast). */ broadcast_tx(ld->topology, channel, channel->last_tx, NULL); remove_sig(channel->last_tx); } resolve_close_command(ld, channel, cooperative); } void channel_errmsg(struct channel *channel, int peer_fd, int gossip_fd, const struct crypto_state *cs, const struct channel_id *channel_id UNUSED, const char *desc, const u8 *err_for_them) { /* No peer fd means a subd crash or disconnection. */ if (peer_fd == -1) { channel_fail_transient(channel, "%s: %s", channel->owner->name, desc); return; } /* Do we have an error to send? */ if (err_for_them && !channel->error) channel->error = tal_dup_arr(channel, u8, err_for_them, tal_count(err_for_them), 0); /* Make sure channel_fail_permanent doesn't tell connectd we died! */ channel->connected = false; notify_disconnect(channel->peer->ld, &channel->peer->id); /* BOLT #1: * * A sending node: *... * - when `channel_id` is 0: * - MUST fail all channels with the receiving node. * - MUST close the connection. */ /* FIXME: Close if it's an all-channels error sent or rcvd */ /* BOLT #1: * * A sending node: * - when sending `error`: * - MUST fail the channel referred to by the error message. *... * The receiving node: * - upon receiving `error`: * - MUST fail the channel referred to by the error message, * if that channel is with the sending node. */ channel_fail_permanent(channel, "%s: %s ERROR %s", channel->owner->name, err_for_them ? "sent" : "received", desc); } /* Possible outcomes returned by the `connected` hook. */ enum peer_connected_hook_result { PEER_CONNECTED_CONTINUE, PEER_CONNECTED_DISCONNECT, }; struct peer_connected_hook_payload { struct lightningd *ld; struct crypto_state crypto_state; struct channel *channel; struct wireaddr_internal addr; struct peer *peer; int peer_fd; int gossip_fd; }; struct peer_connected_hook_response { enum peer_connected_hook_result result; }; static void json_add_htlcs(struct lightningd *ld, struct json_stream *response, const struct channel *channel) { /* FIXME: make per-channel htlc maps! */ const struct htlc_in *hin; struct htlc_in_map_iter ini; const struct htlc_out *hout; struct htlc_out_map_iter outi; /* FIXME: Add more fields. */ json_array_start(response, "htlcs"); 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) continue; json_object_start(response, NULL); json_add_string(response, "direction", "in"); json_add_u64(response, "id", hin->key.id); json_add_amount_msat(response, hin->msat, "msatoshi", "amount_msat"); json_add_u64(response, "expiry", hin->cltv_expiry); json_add_hex(response, "payment_hash", &hin->payment_hash, sizeof(hin->payment_hash)); json_add_string(response, "state", htlc_state_name(hin->hstate)); json_object_end(response); } 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) continue; json_object_start(response, NULL); json_add_string(response, "direction", "out"); json_add_u64(response, "id", hout->key.id); json_add_amount_msat(response, hout->msat, "msatoshi", "amount_msat"); json_add_u64(response, "expiry", hout->cltv_expiry); json_add_hex(response, "payment_hash", &hout->payment_hash, sizeof(hout->payment_hash)); json_add_string(response, "state", htlc_state_name(hout->hstate)); json_object_end(response); } json_array_end(response); } /* We do this replication manually because it's an array. */ static void json_add_sat_only(struct json_stream *result, const char *fieldname, struct amount_sat sat) { struct amount_msat msat; if (amount_sat_to_msat(&msat, sat)) json_add_member(result, fieldname, "\"%s\"", type_to_string(tmpctx, struct amount_msat, &msat)); } static void json_add_channel(struct lightningd *ld, struct json_stream *response, const char *key, const struct channel *channel) { struct channel_id cid; struct channel_stats channel_stats; struct amount_msat spendable, funding_msat; struct peer *p = channel->peer; json_object_start(response, key); json_add_string(response, "state", channel_state_name(channel)); if (channel->last_tx) { struct bitcoin_txid txid; bitcoin_txid(channel->last_tx, &txid); json_add_txid(response, "scratch_txid", &txid); } if (channel->owner) json_add_string(response, "owner", channel->owner->name); if (channel->scid) { json_add_short_channel_id(response, "short_channel_id", channel->scid); json_add_num(response, "direction", pubkey_idx(&ld->id, &channel->peer->id)); } derive_channel_id(&cid, &channel->funding_txid, channel->funding_outnum); json_add_string(response, "channel_id", type_to_string(tmpctx, struct channel_id, &cid)); json_add_txid(response, "funding_txid", &channel->funding_txid); json_add_bool( response, "private", !(channel->channel_flags & CHANNEL_FLAGS_ANNOUNCE_CHANNEL)); // FIXME @conscott : Modify this when dual-funded channels // are implemented json_object_start(response, "funding_allocation_msat"); if (channel->funder == LOCAL) { json_add_u64(response, pubkey_to_hexstr(tmpctx, &p->id), 0); json_add_u64(response, pubkey_to_hexstr(tmpctx, &ld->id), channel->funding.satoshis * 1000); /* Raw: raw JSON field */ } else { json_add_u64(response, pubkey_to_hexstr(tmpctx, &ld->id), 0); json_add_u64(response, pubkey_to_hexstr(tmpctx, &p->id), channel->funding.satoshis * 1000); /* Raw: raw JSON field */ } json_object_end(response); json_object_start(response, "funding_msat"); if (channel->funder == LOCAL) { json_add_sat_only(response, pubkey_to_hexstr(tmpctx, &p->id), AMOUNT_SAT(0)); json_add_sat_only(response, pubkey_to_hexstr(tmpctx, &ld->id), channel->funding); } else { json_add_sat_only(response, pubkey_to_hexstr(tmpctx, &ld->id), AMOUNT_SAT(0)); json_add_sat_only(response, pubkey_to_hexstr(tmpctx, &p->id), channel->funding); } json_object_end(response); if (!amount_sat_to_msat(&funding_msat, channel->funding)) { log_broken(channel->log, "Overflow converting funding %s", type_to_string(tmpctx, struct amount_sat, &channel->funding)); funding_msat = AMOUNT_MSAT(0); } json_add_amount_msat(response, channel->our_msat, "msatoshi_to_us", "to_us_msat"); json_add_amount_msat(response, channel->msat_to_us_min, "msatoshi_to_us_min", "min_to_us_msat"); json_add_amount_msat(response, channel->msat_to_us_max, "msatoshi_to_us_max", "max_to_us_msat"); json_add_amount_msat(response, funding_msat, "msatoshi_total", "total_msat"); /* channel config */ json_add_amount_sat(response, channel->our_config.dust_limit, "dust_limit_satoshis", "dust_limit_msat"); json_add_amount_msat(response, channel->our_config.max_htlc_value_in_flight, "max_htlc_value_in_flight_msat", "max_total_htlc_in_msat"); /* The `channel_reserve_satoshis` is imposed on * the *other* side (see `channel_reserve_msat` * function in, it uses `!side` to flip sides). * So our configuration `channel_reserve_satoshis` * is imposed on their side, while their * configuration `channel_reserve_satoshis` is * imposed on ours. */ json_add_amount_sat(response, channel->our_config.channel_reserve, "their_channel_reserve_satoshis", "their_reserve_msat"); json_add_amount_sat(response, channel->channel_info.their_config.channel_reserve, "our_channel_reserve_satoshis", "our_reserve_msat"); /* Compute how much we can send via this channel. */ if (!amount_msat_sub_sat(&spendable, channel->our_msat, channel->channel_info.their_config.channel_reserve)) spendable = AMOUNT_MSAT(0); json_add_amount_msat(response, spendable, "spendable_msatoshi", "spendable_msat"); json_add_amount_msat(response, channel->our_config.htlc_minimum, "htlc_minimum_msat", "minimum_htlc_in_msat"); /* The `to_self_delay` is imposed on the *other* * side, so our configuration `to_self_delay` is * imposed on their side, while their configuration * `to_self_delay` is imposed on ours. */ json_add_num(response, "their_to_self_delay", channel->our_config.to_self_delay); json_add_num(response, "our_to_self_delay", channel->channel_info.their_config.to_self_delay); json_add_num(response, "max_accepted_htlcs", channel->our_config.max_accepted_htlcs); json_array_start(response, "status"); for (size_t i = 0; i < ARRAY_SIZE(channel->billboard.permanent); i++) { if (!channel->billboard.permanent[i]) continue; json_add_string(response, NULL, channel->billboard.permanent[i]); } if (channel->billboard.transient) json_add_string(response, NULL, channel->billboard.transient); json_array_end(response); /* Provide channel statistics */ wallet_channel_stats_load(ld->wallet, channel->dbid, &channel_stats); json_add_u64(response, "in_payments_offered", channel_stats.in_payments_offered); json_add_amount_msat(response, channel_stats.in_msatoshi_offered, "in_msatoshi_offered", "in_offered_msat"); json_add_u64(response, "in_payments_fulfilled", channel_stats.in_payments_fulfilled); json_add_amount_msat(response, channel_stats.in_msatoshi_fulfilled, "in_msatoshi_fulfilled", "in_fulfilled_msat"); json_add_u64(response, "out_payments_offered", channel_stats.out_payments_offered); json_add_amount_msat(response, channel_stats.out_msatoshi_offered, "out_msatoshi_offered", "out_offered_msat"); json_add_u64(response, "out_payments_fulfilled", channel_stats.out_payments_fulfilled); json_add_amount_msat(response, channel_stats.out_msatoshi_fulfilled, "out_msatoshi_fulfilled", "out_fulfilled_msat"); json_add_htlcs(ld, response, channel); json_object_end(response); } static void peer_connected_serialize(struct peer_connected_hook_payload *payload, struct json_stream *stream) { const struct peer *p = payload->peer; json_object_start(stream, "peer"); json_add_pubkey(stream, "id", &p->id); json_add_string( stream, "addr", type_to_string(stream, struct wireaddr_internal, &payload->addr)); json_add_hex_talarr(stream, "globalfeatures", p->globalfeatures); json_add_hex_talarr(stream, "localfeatures", p->localfeatures); json_object_end(stream); /* .peer */ } static struct peer_connected_hook_response * peer_connected_deserialize(const tal_t *ctx, const char *buffer, const jsmntok_t *toks) { const jsmntok_t *resulttok; struct peer_connected_hook_response *resp; resulttok = json_get_member(buffer, toks, "result"); if (!resulttok) { return NULL; } resp = tal(ctx, struct peer_connected_hook_response); if (json_tok_streq(buffer, resulttok, "continue")) resp->result = PEER_CONNECTED_CONTINUE; else if (json_tok_streq(buffer, resulttok, "disconnect")) resp->result = PEER_CONNECTED_DISCONNECT; else fatal("Plugin returned an invalid response to the connected " "hook: %s", buffer); return resp; } static void peer_connected_hook_cb(struct peer_connected_hook_payload *payload, struct peer_connected_hook_response *response) { struct lightningd *ld = payload->ld; struct crypto_state *cs = &payload->crypto_state; struct channel *channel = payload->channel; struct wireaddr_internal addr = payload->addr; struct peer *peer = payload->peer; int gossip_fd = payload->gossip_fd; int peer_fd = payload->peer_fd; u8 *error; if (response && response->result == PEER_CONNECTED_DISCONNECT) { close(peer_fd); tal_free(payload); return; } if (channel) { log_debug(channel->log, "Peer has reconnected, state %s", channel_state_name(channel)); /* If we have a canned error, deliver it now. */ if (channel->error) { error = channel->error; goto send_error; } #if DEVELOPER if (dev_disconnect_permanent(ld)) { channel_internal_error(channel, "dev_disconnect permfail"); error = channel->error; goto send_error; } #endif switch (channel->state) { case ONCHAIN: case FUNDING_SPEND_SEEN: case CLOSINGD_COMPLETE: /* Channel is supposed to be active! */ abort(); /* We consider this "active" but we only send an error */ case AWAITING_UNILATERAL: { struct channel_id cid; derive_channel_id(&cid, &channel->funding_txid, channel->funding_outnum); /* channel->error is not saved in db, so this can * happen if we restart. */ error = towire_errorfmt(tmpctx, &cid, "Awaiting unilateral close"); goto send_error; } case CHANNELD_AWAITING_LOCKIN: case CHANNELD_NORMAL: case CHANNELD_SHUTTING_DOWN: assert(!channel->owner); channel->peer->addr = addr; peer_start_channeld(channel, cs, peer_fd, gossip_fd, NULL, true); tal_free(payload); return; case CLOSINGD_SIGEXCHANGE: assert(!channel->owner); channel->peer->addr = addr; peer_start_closingd(channel, cs, peer_fd, gossip_fd, true, NULL); tal_free(payload); return; } abort(); } notify_connect(ld, &peer->id, &addr); /* No err, all good. */ error = NULL; send_error: peer_start_openingd(peer, cs, peer_fd, gossip_fd, error); tal_free(payload); } REGISTER_PLUGIN_HOOK(peer_connected, peer_connected_hook_cb, struct peer_connected_hook_payload *, peer_connected_serialize, struct peer_connected_hook_payload *, peer_connected_deserialize, struct peer_connected_hook_response *); /* Connectd tells us a peer has connected: it never hands us duplicates, since * it holds them until we say peer_died. */ void peer_connected(struct lightningd *ld, const u8 *msg, int peer_fd, int gossip_fd) { struct pubkey id; u8 *globalfeatures, *localfeatures; struct peer *peer; struct peer_connected_hook_payload *hook_payload; hook_payload = tal(NULL, struct peer_connected_hook_payload); hook_payload->ld = ld; hook_payload->gossip_fd = gossip_fd; hook_payload->peer_fd = peer_fd; if (!fromwire_connect_peer_connected(msg, msg, &id, &hook_payload->addr, &hook_payload->crypto_state, &globalfeatures, &localfeatures)) fatal("Connectd gave bad CONNECT_PEER_CONNECTED message %s", tal_hex(msg, msg)); /* Complete any outstanding connect commands. */ connect_succeeded(ld, &id); /* If we're already dealing with this peer, hand off to correct * subdaemon. Otherwise, we'll hand to openingd to wait there. */ peer = peer_by_id(ld, &id); if (!peer) peer = new_peer(ld, 0, &id, &hook_payload->addr); tal_steal(peer, hook_payload); hook_payload->peer = peer; peer_update_features(peer, globalfeatures, localfeatures); /* Can't be opening, since we wouldn't have sent peer_disconnected. */ assert(!peer->uncommitted_channel); hook_payload->channel = peer_active_channel(peer); plugin_hook_call_peer_connected(ld, hook_payload, hook_payload); } static enum watch_result funding_lockin_cb(struct lightningd *ld, struct channel *channel, const struct bitcoin_txid *txid, unsigned int depth) { const char *txidstr; txidstr = type_to_string(channel, struct bitcoin_txid, txid); log_debug(channel->log, "Funding tx %s depth %u of %u", txidstr, depth, channel->minimum_depth); tal_free(txidstr); if (depth < channel->minimum_depth) return KEEP_WATCHING; /* If we restart, we could already have peer->scid from database */ if (!channel->scid) { struct txlocator *loc; loc = wallet_transaction_locate(tmpctx, ld->wallet, txid); channel->scid = tal(channel, struct short_channel_id); if (!mk_short_channel_id(channel->scid, loc->blkheight, loc->index, channel->funding_outnum)) { channel_fail_permanent(channel, "Invalid funding scid %u:%u:%u", loc->blkheight, loc->index, channel->funding_outnum); return DELETE_WATCH; } /* We've added scid, update */ wallet_channel_save(ld->wallet, channel); } /* Try to tell subdaemon */ if (!channel_tell_funding_locked(ld, channel, txid, depth)) return KEEP_WATCHING; /* BOLT #7: * * A node: * - if the `open_channel` message has the `announce_channel` bit set AND a `shutdown` message has not been sent: * - MUST send the `announcement_signatures` message. * - MUST NOT send `announcement_signatures` messages until `funding_locked` * has been sent and received AND the funding transaction has at least six confirmations. * - otherwise: * - MUST NOT send the `announcement_signatures` message. */ if (!(channel->channel_flags & CHANNEL_FLAGS_ANNOUNCE_CHANNEL)) return DELETE_WATCH; /* We keep telling it depth until we get to announce depth. */ if (depth < ANNOUNCE_MIN_DEPTH) return KEEP_WATCHING; return DELETE_WATCH; } static enum watch_result funding_spent(struct channel *channel, const struct bitcoin_tx *tx, size_t inputnum UNUSED, const struct block *block) { struct bitcoin_txid txid; bitcoin_txid(tx, &txid); wallet_channeltxs_add(channel->peer->ld->wallet, channel, WIRE_ONCHAIN_INIT, &txid, 0, block->height); return onchaind_funding_spent(channel, tx, block->height); } void channel_watch_funding(struct lightningd *ld, struct channel *channel) { /* FIXME: Remove arg from cb? */ watch_txid(channel, ld->topology, channel, &channel->funding_txid, funding_lockin_cb); watch_txo(channel, ld->topology, channel, &channel->funding_txid, channel->funding_outnum, funding_spent); } static void json_add_peer(struct lightningd *ld, struct json_stream *response, struct peer *p, const enum log_level *ll) { bool connected; struct channel *channel; json_object_start(response, NULL); json_add_pubkey(response, "id", &p->id); /* Channel is also connected if uncommitted channel */ if (p->uncommitted_channel) connected = true; else { channel = peer_active_channel(p); connected = channel && channel->connected; } json_add_bool(response, "connected", connected); /* If it's not connected, features are unreliable: we don't * store them in the database, and they would only reflect * their features *last* time they connected. */ if (connected) { json_array_start(response, "netaddr"); json_add_string(response, NULL, type_to_string(response, struct wireaddr_internal, &p->addr)); json_array_end(response); if (deprecated_apis) { json_add_hex_talarr(response, "global_features", p->globalfeatures); json_add_hex_talarr(response, "local_features", p->localfeatures); } json_add_hex_talarr(response, "globalfeatures", p->globalfeatures); json_add_hex_talarr(response, "localfeatures", p->localfeatures); } json_array_start(response, "channels"); json_add_uncommitted_channel(response, p->uncommitted_channel); list_for_each(&p->channels, channel, list) json_add_channel(ld, response, NULL, channel); json_array_end(response); if (ll) json_add_log(response, p->log_book, *ll); json_object_end(response); } static struct command_result *json_listpeers(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { enum log_level *ll; struct pubkey *specific_id; struct peer *peer; struct json_stream *response; if (!param(cmd, buffer, params, p_opt("id", param_pubkey, &specific_id), p_opt("level", param_loglevel, &ll), NULL)) return command_param_failed(); response = json_stream_success(cmd); json_object_start(response, NULL); json_array_start(response, "peers"); if (specific_id) { peer = peer_by_id(cmd->ld, specific_id); if (peer) json_add_peer(cmd->ld, response, peer, ll); } else { list_for_each(&cmd->ld->peers, peer, list) json_add_peer(cmd->ld, response, peer, ll); } json_array_end(response); json_object_end(response); return command_success(cmd, response); } static const struct json_command listpeers_command = { "listpeers", json_listpeers, "Show current peers, if {level} is set, include logs for {id}" }; AUTODATA(json_command, &listpeers_command); static struct command_result * command_find_channel(struct command *cmd, const char *buffer, const jsmntok_t *tok, struct channel **channel) { struct lightningd *ld = cmd->ld; struct channel_id cid; struct channel_id channel_cid; struct short_channel_id scid; struct peer *peer; if (json_tok_channel_id(buffer, tok, &cid)) { list_for_each(&ld->peers, peer, list) { *channel = peer_active_channel(peer); if (!*channel) continue; derive_channel_id(&channel_cid, &(*channel)->funding_txid, (*channel)->funding_outnum); if (channel_id_eq(&channel_cid, &cid)) return NULL; } return command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Channel ID not found: '%.*s'", tok->end - tok->start, buffer + tok->start); } else if (json_to_short_channel_id(buffer, tok, &scid, deprecated_apis)) { list_for_each(&ld->peers, peer, list) { *channel = peer_active_channel(peer); if (!*channel) continue; if ((*channel)->scid && (*channel)->scid->u64 == scid.u64) return NULL; } return command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Short channel ID not found: '%.*s'", tok->end - tok->start, buffer + tok->start); } else { return command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Given id is not a channel ID or " "short channel ID: '%.*s'", json_tok_full_len(tok), json_tok_full(buffer, tok)); } } static struct command_result *json_close(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { const jsmntok_t *idtok; struct peer *peer; /* FIXME: gcc 7.3.0 thinks this might not be initialized. */ struct channel *channel = NULL; unsigned int *timeout; bool *force; if (!param(cmd, buffer, params, p_req("id", param_tok, &idtok), p_opt_def("force", param_bool, &force, false), p_opt_def("timeout", param_number, &timeout, 30), NULL)) return command_param_failed(); peer = peer_from_json(cmd->ld, buffer, idtok); if (peer) channel = peer_active_channel(peer); else { struct command_result *res; res = command_find_channel(cmd, buffer, idtok, &channel); if (res) return res; } if (!channel && peer) { struct uncommitted_channel *uc = peer->uncommitted_channel; if (uc) { /* Easy case: peer can simply be forgotten. */ kill_uncommitted_channel(uc, "close command called"); return command_success(cmd, null_response(cmd)); } return command_fail(cmd, LIGHTNINGD, "Peer has no active channel"); } /* Normal case. * We allow states shutting down and sigexchange; a previous * close command may have timed out, and this current command * will continue waiting for the effects of the previous * close command. */ if (channel->state != CHANNELD_NORMAL && channel->state != CHANNELD_AWAITING_LOCKIN && channel->state != CHANNELD_SHUTTING_DOWN && channel->state != CLOSINGD_SIGEXCHANGE) { return command_fail(cmd, LIGHTNINGD, "Channel is in state %s", channel_state_name(channel)); } /* If normal or locking in, transition to shutting down * state. * (if already shutting down or sigexchange, just keep * waiting) */ if (channel->state == CHANNELD_NORMAL || channel->state == CHANNELD_AWAITING_LOCKIN) { channel_set_state(channel, channel->state, CHANNELD_SHUTTING_DOWN); if (channel->owner) subd_send_msg(channel->owner, take(towire_channel_send_shutdown(channel))); } /* Register this command for later handling. */ register_close_command(cmd->ld, cmd, channel, *timeout, *force); /* Wait until close drops down to chain. */ return command_still_pending(cmd); } static const struct json_command close_command = { "close", json_close, "Close the channel with {id} " "(either peer ID, channel ID, or short channel ID). " "If {force} (default false) is true, force a unilateral close " "after {timeout} seconds (default 30), " "otherwise just schedule a mutual close later and fail after " "timing out." }; AUTODATA(json_command, &close_command); static void activate_peer(struct peer *peer) { u8 *msg; struct channel *channel; struct lightningd *ld = peer->ld; /* We can only have one active channel: make sure connectd * knows to try reconnecting. */ channel = peer_active_channel(peer); if (channel && ld->reconnect) { msg = towire_connectctl_connect_to_peer(NULL, &peer->id, 0, &peer->addr); subd_send_msg(ld->connectd, take(msg)); channel_set_billboard(channel, false, "Attempting to reconnect"); } list_for_each(&peer->channels, channel, list) { /* Watching lockin may be unnecessary, but it's harmless. */ channel_watch_funding(ld, channel); } } void activate_peers(struct lightningd *ld) { struct peer *p; list_for_each(&ld->peers, p, list) activate_peer(p); } /* Pull peers, channels and HTLCs from db, and wire them up. */ void load_channels_from_wallet(struct lightningd *ld) { struct peer *peer; /* Load peers from database */ if (!wallet_channels_load_active(ld, ld->wallet)) fatal("Could not load channels from the database"); /* This is a poor-man's db join :( */ list_for_each(&ld->peers, peer, list) { struct channel *channel; list_for_each(&peer->channels, channel, list) { if (!wallet_htlcs_load_for_channel(ld->wallet, channel, &ld->htlcs_in, &ld->htlcs_out)) { fatal("could not load htlcs for channel"); } } } /* Now connect HTLC pointers together */ htlcs_reconnect(ld, &ld->htlcs_in, &ld->htlcs_out); } static struct command_result *json_disconnect(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { struct pubkey *id; struct peer *peer; struct channel *channel; bool *force; if (!param(cmd, buffer, params, p_req("id", param_pubkey, &id), p_opt_def("force", param_bool, &force, false), NULL)) return command_param_failed(); peer = peer_by_id(cmd->ld, id); if (!peer) { return command_fail(cmd, LIGHTNINGD, "Peer not connected"); } channel = peer_active_channel(peer); if (channel) { if (*force) { channel_fail_transient(channel, "disconnect command force=true"); return command_success(cmd, null_response(cmd)); } return command_fail(cmd, LIGHTNINGD, "Peer is in state %s", channel_state_name(channel)); } if (!peer->uncommitted_channel) { return command_fail(cmd, LIGHTNINGD, "Peer not connected"); } kill_uncommitted_channel(peer->uncommitted_channel, "disconnect command"); return command_success(cmd, null_response(cmd)); } static const struct json_command disconnect_command = { "disconnect", json_disconnect, "Disconnect from {id} that has previously been connected to using connect; with {force} set, even if it has a current channel" }; AUTODATA(json_command, &disconnect_command); static struct command_result *json_getinfo(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { struct json_stream *response; struct peer *peer; struct channel *channel; unsigned int pending_channels = 0, active_channels = 0, inactive_channels = 0, num_peers = 0; if (!param(cmd, buffer, params, NULL)) return command_param_failed(); response = json_stream_success(cmd); json_object_start(response, NULL); json_add_pubkey(response, "id", &cmd->ld->id); json_add_string(response, "alias", (const char *)cmd->ld->alias); json_add_hex_talarr(response, "color", cmd->ld->rgb); /* Add some peer and channel stats */ list_for_each(&cmd->ld->peers, peer, list) { num_peers++; /* Count towards pending? */ if (peer->uncommitted_channel) { pending_channels++; } list_for_each(&peer->channels, channel, list) { if (channel->state == CHANNELD_AWAITING_LOCKIN) { pending_channels++; } else if (channel_active(channel)) { active_channels++; } else { inactive_channels++; } } } json_add_num(response, "num_peers", num_peers); json_add_num(response, "num_pending_channels", pending_channels); json_add_num(response, "num_active_channels", active_channels); json_add_num(response, "num_inactive_channels", inactive_channels); /* Add network info */ if (cmd->ld->listen) { /* These are the addresses we're announcing */ json_array_start(response, "address"); for (size_t i = 0; i < tal_count(cmd->ld->announcable); i++) json_add_address(response, NULL, cmd->ld->announcable+i); json_array_end(response); /* This is what we're actually bound to. */ json_array_start(response, "binding"); for (size_t i = 0; i < tal_count(cmd->ld->binding); i++) json_add_address_internal(response, NULL, cmd->ld->binding+i); json_array_end(response); } json_add_string(response, "version", version()); json_add_num(response, "blockheight", get_block_height(cmd->ld->topology)); json_add_string(response, "network", get_chainparams(cmd->ld)->network_name); json_add_amount_msat(response, wallet_total_forward_fees(cmd->ld->wallet), "msatoshi_fees_collected", "fees_collected_msat"); json_object_end(response); return command_success(cmd, response); } static const struct json_command getinfo_command = { "getinfo", json_getinfo, "Show information about this node" }; AUTODATA(json_command, &getinfo_command); #if DEVELOPER static struct command_result *json_sign_last_tx(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { struct pubkey *peerid; struct peer *peer; struct json_stream *response; u8 *linear; struct channel *channel; if (!param(cmd, buffer, params, p_req("id", param_pubkey, &peerid), NULL)) return command_param_failed(); peer = peer_by_id(cmd->ld, peerid); if (!peer) { return command_fail(cmd, LIGHTNINGD, "Could not find peer with that id"); } channel = peer_active_channel(peer); if (!channel) { return command_fail(cmd, LIGHTNINGD, "Could not find active channel"); } response = json_stream_success(cmd); log_debug(channel->log, "dev-sign-last-tx: signing tx with %zu outputs", tal_count(channel->last_tx->output)); sign_last_tx(channel); linear = linearize_tx(cmd, channel->last_tx); remove_sig(channel->last_tx); json_object_start(response, NULL); json_add_hex_talarr(response, "tx", linear); json_object_end(response); return command_success(cmd, response); } static const struct json_command dev_sign_last_tx = { "dev-sign-last-tx", json_sign_last_tx, "Sign and show the last commitment transaction with peer {id}" }; AUTODATA(json_command, &dev_sign_last_tx); static struct command_result *json_dev_fail(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { struct pubkey *peerid; struct peer *peer; struct channel *channel; if (!param(cmd, buffer, params, p_req("id", param_pubkey, &peerid), NULL)) return command_param_failed(); peer = peer_by_id(cmd->ld, peerid); if (!peer) { return command_fail(cmd, LIGHTNINGD, "Could not find peer with that id"); } channel = peer_active_channel(peer); if (!channel) { return command_fail(cmd, LIGHTNINGD, "Could not find active channel with peer"); } channel_internal_error(channel, "Failing due to dev-fail command"); return command_success(cmd, null_response(cmd)); } static const struct json_command dev_fail_command = { "dev-fail", json_dev_fail, "Fail with peer {id}" }; AUTODATA(json_command, &dev_fail_command); static void dev_reenable_commit_finished(struct subd *channeld UNUSED, const u8 *resp UNUSED, const int *fds UNUSED, struct command *cmd) { was_pending(command_success(cmd, null_response(cmd))); } static struct command_result *json_dev_reenable_commit(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { struct pubkey *peerid; struct peer *peer; u8 *msg; struct channel *channel; if (!param(cmd, buffer, params, p_req("id", param_pubkey, &peerid), NULL)) return command_param_failed(); peer = peer_by_id(cmd->ld, peerid); if (!peer) { return command_fail(cmd, LIGHTNINGD, "Could not find peer with that id"); } channel = peer_active_channel(peer); if (!channel) { return command_fail(cmd, LIGHTNINGD, "Peer has no active channel"); } if (!channel->owner) { return command_fail(cmd, LIGHTNINGD, "Peer has no owner"); } if (!streq(channel->owner->name, "lightning_channeld")) { return command_fail(cmd, LIGHTNINGD, "Peer owned by %s", channel->owner->name); } msg = towire_channel_dev_reenable_commit(channel); subd_req(peer, channel->owner, take(msg), -1, 0, dev_reenable_commit_finished, cmd); return command_still_pending(cmd); } static const struct json_command dev_reenable_commit = { "dev-reenable-commit", json_dev_reenable_commit, "Re-enable the commit timer on peer {id}" }; AUTODATA(json_command, &dev_reenable_commit); struct dev_forget_channel_cmd { struct short_channel_id scid; struct channel *channel; bool force; struct command *cmd; }; static void process_dev_forget_channel(struct bitcoind *bitcoind UNUSED, const struct bitcoin_tx_output *txout, void *arg) { struct json_stream *response; struct dev_forget_channel_cmd *forget = arg; if (txout != NULL && !forget->force) { was_pending(command_fail(forget->cmd, LIGHTNINGD, "Cowardly refusing to forget channel with an " "unspent funding output, if you know what " "you're doing you can override with " "`force=true`, otherwise consider `close` or " "`dev-fail`! If you force and the channel " "confirms we will not track the funds in the " "channel")); return; } response = json_stream_success(forget->cmd); json_object_start(response, NULL); json_add_bool(response, "forced", forget->force); json_add_bool(response, "funding_unspent", txout != NULL); json_add_txid(response, "funding_txid", &forget->channel->funding_txid); json_object_end(response); /* Set error so we don't try to reconnect. */ forget->channel->error = towire_errorfmt(forget->channel, NULL, "dev_forget_channel"); delete_channel(forget->channel); was_pending(command_success(forget->cmd, response)); } static struct command_result *json_dev_forget_channel(struct command *cmd, const char *buffer, const jsmntok_t *obj UNNEEDED, const jsmntok_t *params) { struct pubkey *peerid; struct peer *peer; struct channel *channel; struct short_channel_id *scid; struct dev_forget_channel_cmd *forget = tal(cmd, struct dev_forget_channel_cmd); forget->cmd = cmd; bool *force; if (!param(cmd, buffer, params, p_req("id", param_pubkey, &peerid), p_opt("short_channel_id", param_short_channel_id, &scid), p_opt_def("force", param_bool, &force, false), NULL)) return command_param_failed(); forget->force = *force; peer = peer_by_id(cmd->ld, peerid); if (!peer) { return command_fail(cmd, LIGHTNINGD, "Could not find channel with that peer"); } forget->channel = NULL; list_for_each(&peer->channels, channel, list) { if (scid) { if (!channel->scid) continue; if (!short_channel_id_eq(channel->scid, scid)) continue; } if (forget->channel) { return command_fail(cmd, LIGHTNINGD, "Multiple channels:" " please specify short_channel_id"); } forget->channel = channel; } if (!forget->channel) { return command_fail(cmd, LIGHTNINGD, "No channels matching that peer_id%s", scid ? " and that short_channel_id" : ""); } if (channel_has_htlc_out(forget->channel) || channel_has_htlc_in(forget->channel)) { return command_fail(cmd, LIGHTNINGD, "This channel has HTLCs attached and it is " "not safe to forget it. Please use `close` " "or `dev-fail` instead."); } bitcoind_gettxout(cmd->ld->topology->bitcoind, &forget->channel->funding_txid, forget->channel->funding_outnum, process_dev_forget_channel, forget); return command_still_pending(cmd); } static const struct json_command dev_forget_channel_command = { "dev-forget-channel", json_dev_forget_channel, "Forget the channel with peer {id}, ignore UTXO check with {force}='true'.", false, "Forget the channel with peer {id}. Checks if the channel is still active by checking its funding transaction. Check can be ignored by setting {force} to 'true'" }; AUTODATA(json_command, &dev_forget_channel_command); static void subd_died_forget_memleak(struct subd *openingd, struct command *cmd) { /* FIXME: We ignore the remaining per-peer daemons in this case. */ peer_memleak_done(cmd, NULL); } /* Mutual recursion */ static void peer_memleak_req_next(struct command *cmd, struct channel *prev); static void peer_memleak_req_done(struct subd *subd, bool found_leak, struct command *cmd) { struct channel *c = subd->channel; if (found_leak) peer_memleak_done(cmd, subd); else peer_memleak_req_next(cmd, c); } static void channeld_memleak_req_done(struct subd *channeld, const u8 *msg, const int *fds UNUSED, struct command *cmd) { bool found_leak; tal_del_destructor2(channeld, subd_died_forget_memleak, cmd); if (!fromwire_channel_dev_memleak_reply(msg, &found_leak)) { was_pending(command_fail(cmd, LIGHTNINGD, "Bad channel_dev_memleak")); return; } peer_memleak_req_done(channeld, found_leak, cmd); } static void onchaind_memleak_req_done(struct subd *onchaind, const u8 *msg, const int *fds UNUSED, struct command *cmd) { bool found_leak; tal_del_destructor2(onchaind, subd_died_forget_memleak, cmd); if (!fromwire_onchain_dev_memleak_reply(msg, &found_leak)) { was_pending(command_fail(cmd, LIGHTNINGD, "Bad onchain_dev_memleak")); return; } peer_memleak_req_done(onchaind, found_leak, cmd); } static void peer_memleak_req_next(struct command *cmd, struct channel *prev) { struct peer *p; list_for_each(&cmd->ld->peers, p, list) { struct channel *c; list_for_each(&p->channels, c, list) { if (c == prev) { prev = NULL; continue; } if (!c->owner) continue; if (prev != NULL) continue; /* Note: closingd does its own checking automatically */ if (streq(c->owner->name, "lightning_channeld")) { subd_req(c, c->owner, take(towire_channel_dev_memleak(NULL)), -1, 0, channeld_memleak_req_done, cmd); tal_add_destructor2(c->owner, subd_died_forget_memleak, cmd); return; } if (streq(c->owner->name, "lightning_onchaind")) { subd_req(c, c->owner, take(towire_onchain_dev_memleak(NULL)), -1, 0, onchaind_memleak_req_done, cmd); tal_add_destructor2(c->owner, subd_died_forget_memleak, cmd); return; } } } peer_memleak_done(cmd, NULL); } void peer_dev_memleak(struct command *cmd) { peer_memleak_req_next(cmd, NULL); } #endif /* DEVELOPER */