#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 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_len(io)); else if (continued) log_add(parent_log, "%s ... %s", prefix, str); else log_(parent_log, level, "%s %s", prefix, str); } 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; /* FIXME: This is always set, right? */ if (addr) peer->addr = *addr; else { peer->addr.itype = ADDR_INTERNAL_WIREADDR; peer->addr.u.wireaddr.type = ADDR_TYPE_PADDING; } 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; } 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); } 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_tok_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); } u32 feerate_min(struct lightningd *ld) { u32 min; /* We can't allow less than feerate_floor, since that won't relay */ if (ld->config.ignore_fee_limits) min = 1; else /* Set this to half of slow rate.*/ min = get_feerate(ld->topology, FEERATE_SLOW) / 2; if (min < feerate_floor()) return feerate_floor(); return min; } /* BOLT #2: * * Given the variance in fees, and the fact that the transaction may be * spent in the future, it's a good idea for the fee payer to keep a good * margin (say 5x the expected fee requirement) */ u32 feerate_max(struct lightningd *ld) { if (ld->config.ignore_fee_limits) return UINT_MAX; return get_feerate(ld->topology, FEERATE_IMMEDIATE) * ld->config.max_fee_multiplier; } static void sign_last_tx(struct channel *channel) { u8 *funding_wscript; struct secrets secrets; secp256k1_ecdsa_signature sig; assert(!channel->last_tx->input[0].witness); derive_basepoints(&channel->seed, NULL, NULL, &secrets, NULL); funding_wscript = bitcoin_redeem_2of2(tmpctx, &channel->local_funding_pubkey, &channel->channel_info.remote_fundingkey); /* Need input amount for signing */ channel->last_tx->input[0].amount = tal_dup(channel->last_tx->input, u64, &channel->funding_satoshi); sign_tx_input(channel->last_tx, 0, NULL, funding_wscript, &secrets.funding_privkey, &channel->local_funding_pubkey, &sig); 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].amount = tal_free(signed_tx->input[0].amount); 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_result *result = new_json_result(cc); 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(result, "tx", tx, tal_len(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); 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; 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. */ 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) { u8 *msg; /* Tell gossipd we no longer need to keep connection to this peer */ msg = towire_gossipctl_peer_important(NULL, &channel->peer->id, false); subd_send_msg(ld->gossip, take(msg)); 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); resolve_close_command(ld, channel, cooperative); remove_sig(channel->last_tx); } 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) { struct lightningd *ld = channel->peer->ld; u8 *msg; /* 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_len(err_for_them), 0); /* Make sure channel_fail_permanent doesn't tell gossipd we died! */ channel->connected = false; /* BOLT #1: * * A sending node: *... * - when `channel_id` is 0: * - MUST fail all channels with the receiving node. * - MUST close the connection. */ /* FIXME: Gossipd closes connection, but doesn't fail channels. */ /* 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); /* Hand back to gossipd, with any error packet. */ msg = towire_gossipctl_hand_back_peer(NULL, &channel->peer->id, cs, err_for_them); subd_send_msg(ld->gossip, take(msg)); subd_send_fd(ld->gossip, peer_fd); subd_send_fd(ld->gossip, gossip_fd); } /* Gossipd 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; struct crypto_state cs; u8 *gfeatures, *lfeatures; u8 *error; u8 *global_features; u8 *local_features; struct channel *channel; struct wireaddr_internal addr; struct uncommitted_channel *uc; if (!fromwire_gossip_peer_connected(msg, msg, &id, &addr, &cs, &gfeatures, &lfeatures)) fatal("Gossip gave bad GOSSIP_PEER_CONNECTED message %s", tal_hex(msg, msg)); if (!features_supported(gfeatures, lfeatures)) { log_unusual(ld->log, "peer %s offers unsupported features %s/%s", type_to_string(msg, struct pubkey, &id), tal_hex(msg, gfeatures), tal_hex(msg, lfeatures)); global_features = get_offered_global_features(msg); local_features = get_offered_local_features(msg); error = towire_errorfmt(msg, NULL, "We only offer globalfeatures %s" " and localfeatures %s", tal_hexstr(msg, global_features, tal_len(global_features)), tal_hexstr(msg, local_features, tal_len(local_features))); goto send_error; } /* Were we trying to open a channel, and we've raced? */ if (handle_opening_channel(ld, &id, &addr, &cs, gfeatures, lfeatures, peer_fd, gossip_fd)) return; /* If we're already dealing with this peer, hand off to correct * subdaemon. Otherwise, we'll respond iff they ask about an inactive * channel. */ channel = active_channel_by_id(ld, &id, &uc); /* Can't be opening now, since we wouldn't have sent peer_died. */ assert(!uc); 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 active! */ abort(); 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); return; case CLOSINGD_SIGEXCHANGE: assert(!channel->owner); channel->peer->addr = addr; peer_start_closingd(channel, &cs, peer_fd, gossip_fd, true, NULL); return; } abort(); } /* No err, all good. */ error = NULL; send_error: /* Hand back to gossipd, with an error packet. */ msg = towire_gossipctl_hand_back_peer(msg, &id, &cs, error); subd_send_msg(ld->gossip, take(msg)); subd_send_fd(ld->gossip, peer_fd); subd_send_fd(ld->gossip, gossip_fd); } static struct channel *channel_by_channel_id(struct peer *peer, const struct channel_id *channel_id) { struct channel *channel; list_for_each(&peer->channels, channel, list) { struct channel_id cid; derive_channel_id(&cid, &channel->funding_txid, channel->funding_outnum); if (channel_id_eq(&cid, channel_id)) return channel; } return NULL; } /* We only get here IF we weren't trying to connect to it. */ void peer_sent_nongossip(struct lightningd *ld, const struct pubkey *id, const struct wireaddr_internal *addr, const struct crypto_state *cs, const u8 *gfeatures, const u8 *lfeatures, int peer_fd, int gossip_fd, const u8 *in_msg) { struct channel_id *channel_id, extracted_channel_id; struct peer *peer; u8 *error, *msg; if (!extract_channel_id(in_msg, &extracted_channel_id)) channel_id = NULL; else channel_id = &extracted_channel_id; peer = peer_by_id(ld, id); /* Open request? */ if (fromwire_peektype(in_msg) == WIRE_OPEN_CHANNEL) { error = peer_accept_channel(tmpctx, ld, id, addr, cs, gfeatures, lfeatures, peer_fd, gossip_fd, channel_id, in_msg); if (error) goto send_error; return; } /* If they are talking about a specific channel id, we may have an * error for them. */ if (peer && channel_id) { struct channel *channel; channel = channel_by_channel_id(peer, channel_id); if (channel && channel->error) { error = channel->error; goto send_error; } /* Reestablish for a now-closed channel? They might have * missed final update, so do the closing negotiation dance * again. */ if (fromwire_peektype(in_msg) == WIRE_CHANNEL_REESTABLISH && channel && channel->state == CLOSINGD_COMPLETE) { peer_start_closingd(channel, cs, peer_fd, gossip_fd, true, in_msg); return; } } /* Weird request. */ error = towire_errorfmt(tmpctx, channel_id, "Unexpected message %i for peer", fromwire_peektype(in_msg)); send_error: /* Hand back to gossipd, with an error packet. */ msg = towire_gossipctl_hand_back_peer(ld, id, cs, error); subd_send_msg(ld->gossip, take(msg)); subd_send_fd(ld->gossip, peer_fd); subd_send_fd(ld->gossip, gossip_fd); } static enum watch_result funding_lockin_cb(struct channel *channel, const struct bitcoin_txid *txid, unsigned int depth) { const char *txidstr; struct lightningd *ld = channel->peer->ld; 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); mk_short_channel_id(channel->scid, loc->blkheight, loc->index, channel->funding_outnum); /* 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 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); } struct getpeers_args { struct command *cmd; /* If non-NULL, they want logs too */ enum log_level *ll; /* If set, only report on a specific id. */ struct pubkey *specific_id; }; static void json_add_node_decoration(struct json_result *response, struct gossip_getnodes_entry *node) { struct json_escaped *esc; if (node->local_features) json_add_hex(response, "local_features", node->local_features, tal_len(node->local_features)); if (node->global_features) json_add_hex(response, "global_features", node->global_features, tal_len(node->global_features)); /* If node announcement hasn't been received yet, no alias information. */ if (node->last_timestamp < 0) return; esc = json_escape(NULL, (const char *)node->alias); json_add_escaped_string(response, "alias", take(esc)); json_add_hex(response, "color", node->color, ARRAY_SIZE(node->color)); } static void gossipd_getpeers_complete(struct subd *gossip, const u8 *msg, const int *fds UNUSED, struct getpeers_args *gpa) { /* This is a little sneaky... */ struct pubkey *ids; struct wireaddr_internal *addrs; struct gossip_getnodes_entry **nodes; struct json_result *response = new_json_result(gpa->cmd); struct peer *p; if (!fromwire_gossip_getpeers_reply(msg, msg, &ids, &addrs, &nodes)) { command_fail(gpa->cmd, LIGHTNINGD, "Bad response from gossipd"); return; } /* First the peers not just gossiping. */ json_object_start(response, NULL); json_array_start(response, "peers"); list_for_each(&gpa->cmd->ld->peers, p, list) { bool connected; struct channel *channel; struct channel_stats channel_stats; if (gpa->specific_id && !pubkey_eq(gpa->specific_id, &p->id)) continue; 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 (connected) { json_array_start(response, "netaddr"); if (p->addr.itype != ADDR_INTERNAL_WIREADDR || p->addr.u.wireaddr.type != ADDR_TYPE_PADDING) json_add_string(response, NULL, type_to_string(response, struct wireaddr_internal, &p->addr)); json_array_end(response); } /* Search gossip reply for this ID, to add extra info. */ for (size_t i = 0; i < tal_count(nodes); i++) { if (pubkey_eq(&nodes[i]->nodeid, &p->id)) { json_add_node_decoration(response, nodes[i]); break; } } json_array_start(response, "channels"); json_add_uncommitted_channel(response, p->uncommitted_channel); /* FIXME: Add their local and global features */ list_for_each(&p->channels, channel, list) { struct channel_id cid; u64 our_reserve_msat = channel->channel_info.their_config.channel_reserve_satoshis * 1000; json_object_start(response, NULL); json_add_string(response, "state", channel_state_name(channel)); 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); 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_u64(response, "msatoshi_to_us", channel->our_msatoshi); json_add_u64(response, "msatoshi_to_us_min", channel->msatoshi_to_us_min); json_add_u64(response, "msatoshi_to_us_max", channel->msatoshi_to_us_max); json_add_u64(response, "msatoshi_total", channel->funding_satoshi * 1000); /* channel config */ json_add_u64(response, "dust_limit_satoshis", channel->our_config.dust_limit_satoshis); json_add_u64(response, "max_htlc_value_in_flight_msat", channel->our_config.max_htlc_value_in_flight_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_u64(response, "their_channel_reserve_satoshis", channel->our_config.channel_reserve_satoshis); json_add_u64(response, "our_channel_reserve_satoshis", channel->channel_info.their_config.channel_reserve_satoshis); if (deprecated_apis) json_add_u64(response, "channel_reserve_satoshis", channel->our_config.channel_reserve_satoshis); /* Compute how much we can send via this channel. */ if (channel->our_msatoshi <= our_reserve_msat) json_add_u64(response, "spendable_msatoshi", 0); else json_add_u64(response, "spendable_msatoshi", channel->our_msatoshi - our_reserve_msat); json_add_u64(response, "htlc_minimum_msat", channel->our_config.htlc_minimum_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); if (deprecated_apis) json_add_num(response, "to_self_delay", channel->our_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(gpa->cmd->ld->wallet, channel->dbid, &channel_stats); json_add_u64(response, "in_payments_offered", channel_stats.in_payments_offered); json_add_u64(response, "in_msatoshi_offered", channel_stats.in_msatoshi_offered); json_add_u64(response, "in_payments_fulfilled", channel_stats.in_payments_fulfilled); json_add_u64(response, "in_msatoshi_fulfilled", channel_stats.in_msatoshi_fulfilled); json_add_u64(response, "out_payments_offered", channel_stats.out_payments_offered); json_add_u64(response, "out_msatoshi_offered", channel_stats.out_msatoshi_offered); json_add_u64(response, "out_payments_fulfilled", channel_stats.out_payments_fulfilled); json_add_u64(response, "out_msatoshi_fulfilled", channel_stats.out_msatoshi_fulfilled); json_object_end(response); } json_array_end(response); if (gpa->ll) json_add_log(response, p->log_book, *gpa->ll); json_object_end(response); } for (size_t i = 0; i < tal_count(ids); i++) { /* Don't report peers in both, which can happen if they're * reconnecting */ if (peer_by_id(gpa->cmd->ld, ids + i)) continue; json_object_start(response, NULL); /* Fake state. */ json_add_string(response, "state", "GOSSIPING"); json_add_pubkey(response, "id", ids+i); json_add_node_decoration(response, nodes[i]); json_array_start(response, "netaddr"); if (addrs[i].itype != ADDR_INTERNAL_WIREADDR || addrs[i].u.wireaddr.type != ADDR_TYPE_PADDING) json_add_string(response, NULL, type_to_string(response, struct wireaddr_internal, addrs + i)); json_array_end(response); json_add_bool(response, "connected", true); json_add_string(response, "owner", gossip->name); json_object_end(response); } json_array_end(response); json_object_end(response); command_success(gpa->cmd, response); } static void json_listpeers(struct command *cmd, const char *buffer, const jsmntok_t *params) { struct getpeers_args *gpa = tal(cmd, struct getpeers_args); gpa->cmd = cmd; if (!param(cmd, buffer, params, p_opt("id", json_tok_pubkey, &gpa->specific_id), p_opt("level", json_tok_loglevel, &gpa->ll), NULL)) return; /* Get peers from gossipd. */ subd_req(cmd, cmd->ld->gossip, take(towire_gossip_getpeers_request(cmd, gpa->specific_id)), -1, 0, gossipd_getpeers_complete, gpa); command_still_pending(cmd); } 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 channel * command_find_channel(struct command *cmd, const char *buffer, const jsmntok_t *tok) { struct lightningd *ld = cmd->ld; struct channel_id cid; struct channel_id channel_cid; struct short_channel_id scid; struct peer *peer; struct channel *channel; 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 channel; } command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Channel ID not found: '%.*s'", tok->end - tok->start, buffer + tok->start); return NULL; } else if (json_tok_short_channel_id(buffer, tok, &scid)) { list_for_each(&ld->peers, peer, list) { channel = peer_active_channel(peer); if (!channel) continue; if (channel->scid && channel->scid->u64 == scid.u64) return channel; } command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Short channel ID not found: '%.*s'", tok->end - tok->start, buffer + tok->start); return NULL; } else { command_fail(cmd, JSONRPC2_INVALID_PARAMS, "Given id is not a channel ID or " "short channel ID: '%.*s'", tok->end - tok->start, buffer + tok->start); return NULL; } } static void json_close(struct command *cmd, const char *buffer, const jsmntok_t *params) { const jsmntok_t *idtok; struct peer *peer; struct channel *channel; unsigned int timeout; bool force; if (!param(cmd, buffer, params, p_req("id", json_tok_tok, &idtok), p_opt_def("force", json_tok_bool, &force, false), p_opt_def("timeout", json_tok_number, &timeout, 30), NULL)) return; peer = peer_from_json(cmd->ld, buffer, idtok); if (peer) channel = peer_active_channel(peer); else { channel = command_find_channel(cmd, buffer, idtok); if (!channel) return; } 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"); command_success(cmd, null_response(cmd)); return; } command_fail(cmd, LIGHTNINGD, "Peer has no active channel"); return; } /* 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) 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. */ 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; /* Pass gossipd any addrhints we currently have */ msg = towire_gossipctl_peer_addrhint(peer, &peer->id, &peer->addr); subd_send_msg(peer->ld->gossip, take(msg)); /* We can only have one active channel: make sure gossipd * knows to reconnect. */ channel = peer_active_channel(peer); if (channel) tell_gossipd_peer_is_important(ld, channel); 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); } /* Peer has been released from gossip. */ static void gossip_peer_disconnected (struct subd *gossip, const u8 *resp, const int *fds, struct command *cmd) { bool isconnected; if (!fromwire_gossipctl_peer_disconnect_reply(resp)) { if (!fromwire_gossipctl_peer_disconnect_replyfail(resp, &isconnected)) fatal("Gossip daemon gave invalid reply %s", tal_hex(gossip, resp)); if (isconnected) command_fail(cmd, LIGHTNINGD, "Peer is not in gossip mode"); else command_fail(cmd, LIGHTNINGD, "Peer not connected"); } else { /* Successfully disconnected */ command_success(cmd, null_response(cmd)); } return; } static void json_disconnect(struct command *cmd, const char *buffer, const jsmntok_t *params) { struct pubkey id; u8 *msg; if (!param(cmd, buffer, params, p_req("id", json_tok_pubkey, &id), NULL)) return; msg = towire_gossipctl_peer_disconnect(cmd, &id); subd_req(cmd, cmd->ld->gossip, msg, -1, 0, gossip_peer_disconnected, cmd); command_still_pending(cmd); } static const struct json_command disconnect_command = { "disconnect", json_disconnect, "Disconnect from {id} that has previously been connected to using connect" }; AUTODATA(json_command, &disconnect_command); #if DEVELOPER static void json_sign_last_tx(struct command *cmd, const char *buffer, const jsmntok_t *params) { struct pubkey peerid; struct peer *peer; struct json_result *response = new_json_result(cmd); u8 *linear; struct channel *channel; if (!param(cmd, buffer, params, p_req("id", json_tok_pubkey, &peerid), NULL)) return; peer = peer_by_id(cmd->ld, &peerid); if (!peer) { command_fail(cmd, LIGHTNINGD, "Could not find peer with that id"); return; } channel = peer_active_channel(peer); if (!channel) { command_fail(cmd, LIGHTNINGD, "Could not find active channel"); return; } 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(response, "tx", linear, tal_len(linear)); json_object_end(response); 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 void json_dev_fail(struct command *cmd, const char *buffer, const jsmntok_t *params) { struct pubkey peerid; struct peer *peer; struct channel *channel; if (!param(cmd, buffer, params, p_req("id", json_tok_pubkey, &peerid), NULL)) return; peer = peer_by_id(cmd->ld, &peerid); if (!peer) { command_fail(cmd, LIGHTNINGD, "Could not find peer with that id"); return; } channel = peer_active_channel(peer); if (!channel) { command_fail(cmd, LIGHTNINGD, "Could not find active channel with peer"); return; } channel_internal_error(channel, "Failing due to dev-fail command"); 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) { command_success(cmd, null_response(cmd)); } static void json_dev_reenable_commit(struct command *cmd, const char *buffer, const jsmntok_t *params) { struct pubkey peerid; struct peer *peer; u8 *msg; struct channel *channel; if (!param(cmd, buffer, params, p_req("id", json_tok_pubkey, &peerid), NULL)) return; peer = peer_by_id(cmd->ld, &peerid); if (!peer) { command_fail(cmd, LIGHTNINGD, "Could not find peer with that id"); return; } channel = peer_active_channel(peer); if (!channel) { command_fail(cmd, LIGHTNINGD, "Peer has no active channel"); return; } if (!channel->owner) { command_fail(cmd, LIGHTNINGD, "Peer has no owner"); return; } if (!streq(channel->owner->name, "lightning_channeld")) { command_fail(cmd, LIGHTNINGD, "Peer owned by %s", channel->owner->name); return; } msg = towire_channel_dev_reenable_commit(channel); subd_req(peer, channel->owner, take(msg), -1, 0, dev_reenable_commit_finished, cmd); 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_result *response; struct dev_forget_channel_cmd *forget = arg; if (txout != NULL && !forget->force) { 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 = new_json_result(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); delete_channel(forget->channel); command_success(forget->cmd, response); } static void json_dev_forget_channel(struct command *cmd, const char *buffer, 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; /* If &forget->force is used directly in p_opt_def() below then * gcc 7.3.0 fails with: * 'operation on ‘forget->force’ may be undefined [-Werror=sequence-point]' * * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86584 * * Hence this indirection. */ bool *force = &forget->force; if (!param(cmd, buffer, params, p_req("id", json_tok_pubkey, &peerid), p_opt("short_channel_id", json_tok_short_channel_id, &scid), p_opt_def("force", json_tok_bool, force, false), NULL)) return; peer = peer_by_id(cmd->ld, &peerid); if (!peer) { command_fail(cmd, LIGHTNINGD, "Could not find channel with that peer"); return; } 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) { command_fail(cmd, LIGHTNINGD, "Multiple channels:" " please specify short_channel_id"); return; } forget->channel = channel; } if (!forget->channel) { command_fail(cmd, LIGHTNINGD, "No channels matching that short_channel_id"); return; } if (channel_has_htlc_out(forget->channel) || channel_has_htlc_in(forget->channel)) { command_fail(cmd, LIGHTNINGD, "This channel has HTLCs attached and it is " "not safe to forget it. Please use `close` " "or `dev-fail` instead."); return; } bitcoind_gettxout(cmd->ld->topology->bitcoind, &forget->channel->funding_txid, forget->channel->funding_outnum, process_dev_forget_channel, forget); 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); #endif /* DEVELOPER */