#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 struct connect { struct list_node list; struct pubkey id; struct command *cmd; }; /* FIXME: Reorder */ struct funding_channel; static void peer_offer_channel(struct lightningd *ld, struct funding_channel *fc, const struct wireaddr *addr, const struct crypto_state *cs, u64 gossip_index, const u8 *gfeatures, const u8 *lfeatures, int peer_fd, int gossip_fd); static bool peer_start_channeld(struct peer *peer, const struct crypto_state *cs, u64 gossip_index, int peer_fd, int gossip_fd, const u8 *funding_signed, bool reconnected); static void peer_start_closingd(struct peer *peer, struct crypto_state *cs, u64 gossip_index, int peer_fd, int gossip_fd, bool reconnected); static void peer_accept_channel(struct lightningd *ld, const struct pubkey *peer_id, const struct wireaddr *addr, const struct crypto_state *cs, u64 gossip_index, const u8 *gfeatures, const u8 *lfeatures, int peer_fd, int gossip_fd, const u8 *open_msg); static void peer_set_owner(struct peer *peer, struct subd *owner) { struct subd *old_owner = peer->owner; peer->owner = owner; if (old_owner) subd_release_peer(old_owner, peer); } static void destroy_peer(struct peer *peer) { /* Must not have any HTLCs! */ struct htlc_out_map_iter outi; struct htlc_out *hout; struct htlc_in_map_iter ini; struct htlc_in *hin; for (hout = htlc_out_map_first(&peer->ld->htlcs_out, &outi); hout; hout = htlc_out_map_next(&peer->ld->htlcs_out, &outi)) { if (hout->key.peer != peer) continue; fatal("Freeing peer %s has hout %s", peer_state_name(peer->state), htlc_state_name(hout->hstate)); } for (hin = htlc_in_map_first(&peer->ld->htlcs_in, &ini); hin; hin = htlc_in_map_next(&peer->ld->htlcs_in, &ini)) { if (hin->key.peer != peer) continue; fatal("Freeing peer %s has hin %s", peer_state_name(peer->state), htlc_state_name(hin->hstate)); } /* Free any old owner still hanging around. */ peer_set_owner(peer, NULL); list_del_from(&peer->ld->peers, &peer->list); } static void sign_last_tx(struct peer *peer) { const tal_t *tmpctx = tal_tmpctx(peer); u8 *funding_wscript; struct pubkey local_funding_pubkey; struct secrets secrets; secp256k1_ecdsa_signature sig; assert(!peer->last_tx->input[0].witness); derive_basepoints(peer->seed, &local_funding_pubkey, NULL, &secrets, NULL); funding_wscript = bitcoin_redeem_2of2(tmpctx, &local_funding_pubkey, &peer->channel_info->remote_fundingkey); /* Need input amount for signing */ peer->last_tx->input[0].amount = tal_dup(peer->last_tx->input, u64, &peer->funding_satoshi); sign_tx_input(peer->last_tx, 0, NULL, funding_wscript, &secrets.funding_privkey, &local_funding_pubkey, &sig); peer->last_tx->input[0].witness = bitcoin_witness_2of2(peer->last_tx->input, peer->last_sig, &sig, &peer->channel_info->remote_fundingkey, &local_funding_pubkey); tal_free(tmpctx); } 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); } static void drop_to_chain(struct peer *peer) { sign_last_tx(peer); /* Keep broadcasting until we say stop (can fail due to dup, * if they beat us to the broadcast). */ broadcast_tx(peer->ld->topology, peer, peer->last_tx, NULL); remove_sig(peer->last_tx); } /* This lets us give a more detailed error than just a destructor. */ static void free_peer(struct peer *peer, const char *why) { if (peer->opening_cmd) { command_fail(peer->opening_cmd, "%s", why); peer->opening_cmd = NULL; } tal_free(peer); } void peer_fail_permanent(struct peer *peer, const char *fmt, ...) { va_list ap; char *why; u8 *msg; va_start(ap, fmt); why = tal_vfmt(peer, fmt, ap); va_end(ap); if (peer->scid) { msg = towire_gossip_disable_channel(peer, peer->scid, peer->direction, false); subd_send_msg(peer->ld->gossip, take(msg)); } log_unusual(peer->log, "Peer permanent failure in %s: %s", peer_state_name(peer->state), why); /* We can have multiple errors, eg. onchaind failures. */ if (!peer->error) { /* BOLT #1: * * The channel is referred to by `channel_id` unless `channel_id` is * zero (ie. all bytes zero), in which case it refers to all * channels. */ static const struct channel_id all_channels; u8 *msg = tal_dup_arr(peer, u8, (const u8 *)why, strlen(why), 0); peer->error = towire_error(peer, &all_channels, msg); tal_free(msg); } peer_set_owner(peer, NULL); if (peer_persists(peer)) { drop_to_chain(peer); tal_free(why); } else free_peer(peer, why); } void peer_internal_error(struct peer *peer, const char *fmt, ...) { va_list ap; va_start(ap, fmt); log_broken(peer->log, "Peer internal error %s: ", peer_state_name(peer->state)); logv_add(peer->log, fmt, ap); va_end(ap); peer_fail_permanent(peer, "Internal error"); } void peer_fail_transient(struct peer *peer, const char *fmt, ...) { va_list ap; const char *why; va_start(ap, fmt); why = tal_vfmt(peer, fmt, ap); va_end(ap); log_info(peer->log, "Peer transient failure in %s: %s", peer_state_name(peer->state), why); #if DEVELOPER if (dev_disconnect_permanent(peer->ld)) { tal_free(why); peer_internal_error(peer, "dev_disconnect permfail"); return; } #endif peer_set_owner(peer, NULL); /* If we haven't reached awaiting locked, we don't need to reconnect */ if (!peer_persists(peer)) { log_info(peer->log, "Only reached state %s: forgetting", peer_state_name(peer->state)); free_peer(peer, why); return; } tal_free(why); /* Reconnect unless we've dropped/are dropping to chain. */ if (!peer_on_chain(peer) && peer->state != CLOSINGD_COMPLETE) { #if DEVELOPER /* Don't schedule an attempt if we disabled reconnections with * the `--dev-no-reconnect` flag */ if (peer->ld->no_reconnect) return; #endif /* DEVELOPER */ u8 *msg = towire_gossipctl_reach_peer(peer, &peer->id); subd_send_msg(peer->ld->gossip, take(msg)); } } void peer_set_condition(struct peer *peer, enum peer_state old_state, enum peer_state state) { log_info(peer->log, "State changed from %s to %s", peer_state_name(peer->state), peer_state_name(state)); if (peer->state != old_state) fatal("peer state %s should be %s", peer_state_name(peer->state), peer_state_name(old_state)); peer->state = state; /* We only persist channels/peers that have reached the opening state */ if (peer_persists(peer)) { assert(peer->channel != NULL); /* TODO(cdecker) Selectively save updated fields to DB */ wallet_channel_save(peer->ld->wallet, peer->channel, 0); } } static void destroy_connect(struct connect *c) { list_del(&c->list); } static struct connect *new_connect(struct lightningd *ld, const struct pubkey *id, struct command *cmd) { struct connect *c = tal(cmd, struct connect); c->id = *id; c->cmd = cmd; list_add(&ld->connects, &c->list); tal_add_destructor(c, destroy_connect); return c; } static void connect_succeeded(struct lightningd *ld, const struct pubkey *id) { struct connect *i, *next; /* Careful! Completing command frees connect. */ list_for_each_safe(&ld->connects, i, next, list) { struct json_result *response; if (!pubkey_eq(&i->id, id)) continue; response = new_json_result(i->cmd); json_object_start(response, NULL); json_add_pubkey(response, "id", id); json_object_end(response); command_success(i->cmd, response); } } static void connect_failed(struct lightningd *ld, const struct pubkey *id, const char *error) { struct connect *i, *next; /* Careful! Completing command frees connect. */ list_for_each_safe(&ld->connects, i, next, list) { if (pubkey_eq(&i->id, id)) command_fail(i->cmd, "%s", error); } } static struct peer *new_peer(struct lightningd *ld, const struct pubkey *id, const struct wireaddr *addr, const u8 *gfeatures, const u8 *lfeatures, int peer_fd) { struct peer *peer; /* Need to memset since storing will access all fields */ peer = talz(ld, struct peer); peer->error = NULL; peer->id = *id; peer->addr = *addr; peer->funding_txid = NULL; peer->remote_funding_locked = false; peer->scid = NULL; peer->seed = NULL; peer->our_msatoshi = NULL; peer->state = UNINITIALIZED; peer->opening_cmd = NULL; peer->channel_info = NULL; peer->last_tx = NULL; peer->last_sig = NULL; peer->last_htlc_sigs = NULL; peer->last_was_revoke = false; peer->last_sent_commit = NULL; peer->remote_shutdown_scriptpubkey = NULL; peer->local_shutdown_idx = -1; peer->next_index[LOCAL] = peer->next_index[REMOTE] = 0; peer->next_htlc_id = 0; wallet_shachain_init(ld->wallet, &peer->their_shachain); /* FIXME: db should be keyed by (peer_id, channel_id) */ /* If we have the peer in the DB, this'll populate the fields, * failure just indicates that the peer wasn't found in the * DB */ wallet_peer_by_nodeid(ld->wallet, id, peer); /* peer->channel gets populated as soon as we start opening a channel */ peer->channel = NULL; list_add_tail(&ld->peers, &peer->list); populate_peer(ld, peer); return peer; } /** * peer_channel_new -- Instantiate a new channel for the given peer and save it * * We are about to open a channel with the peer, either due to a * nongossip message from remote, or because we initiated an * open. This creates the `struct wallet_channel` for the peer and * stores it in the database. * * @w: the wallet to store the information in * @peer: the peer we are opening a channel to * * This currently overwrites peer->channel, so can only be used if we * allow a single channel per peer. */ static struct wallet_channel *peer_channel_new(struct wallet *w, struct peer *peer) { struct wallet_channel *wc = tal(peer, struct wallet_channel); wc->peer = peer; wallet_peer_by_nodeid(w, &peer->id, peer); wc->id = 0; wallet_channel_save(w, wc, get_block_height(peer->ld->topology)); return wc; } static void channel_config(struct lightningd *ld, struct channel_config *ours, u32 *max_to_self_delay, u32 *max_minimum_depth, u64 *min_effective_htlc_capacity_msat) { /* FIXME: depend on feerate. */ *max_to_self_delay = ld->config.locktime_max; *max_minimum_depth = ld->config.anchor_confirms_max; /* This is 1c at $1000/BTC */ *min_effective_htlc_capacity_msat = 1000000; /* BOLT #2: * * The sender SHOULD set `dust_limit_satoshis` to a sufficient * value to allow commitment transactions to propagate through * the Bitcoin network. */ ours->dust_limit_satoshis = 546; ours->max_htlc_value_in_flight_msat = UINT64_MAX; /* Don't care */ ours->htlc_minimum_msat = 0; /* BOLT #2: * * The sender SHOULD set `to_self_delay` sufficient to ensure * the sender can irreversibly spend a commitment transaction * output in case of misbehavior by the receiver. */ ours->to_self_delay = ld->config.locktime_blocks; /* BOLT #2: * * It MUST fail the channel if `max_accepted_htlcs` is greater than * 483. */ ours->max_accepted_htlcs = 483; /* This is filled in by lightning_openingd, for consistency. */ ours->channel_reserve_satoshis = 0; }; /* Gossipd tells us a peer has connected */ 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 *supported_global_features; u8 *supported_local_features; struct peer *peer; struct wireaddr addr; u64 gossip_index; if (!fromwire_gossip_peer_connected(msg, msg, NULL, &id, &addr, &cs, &gossip_index, &gfeatures, &lfeatures)) fatal("Gossip gave bad GOSSIP_PEER_CONNECTED message %s", tal_hex(msg, msg)); if (unsupported_features(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)); supported_global_features = get_supported_global_features(msg); supported_local_features = get_supported_local_features(msg); error = towire_errorfmt(msg, NULL, "We only support globalfeatures %s" " and localfeatures %s", tal_hexstr(msg, supported_global_features, tal_len(supported_global_features)), tal_hexstr(msg, supported_local_features, tal_len(supported_local_features))); goto send_error; } /* Now, do we already know this peer? */ peer = peer_by_id(ld, &id); if (peer) { log_debug(peer->log, "Peer has reconnected, state %s", peer_state_name(peer->state)); /* FIXME: We can have errors for multiple channels. */ if (peer->error) { error = peer->error; goto send_error; } #if DEVELOPER if (dev_disconnect_permanent(ld)) { peer_internal_error(peer, "dev_disconnect permfail"); error = peer->error; goto send_error; } #endif switch (peer->state) { /* This can't happen. */ case UNINITIALIZED: abort(); /* Reconnect: discard old one. */ case OPENINGD: free_peer(peer, "peer reconnected"); peer = NULL; goto return_to_gossipd; case ONCHAIND_CHEATED: case ONCHAIND_THEIR_UNILATERAL: case ONCHAIND_OUR_UNILATERAL: case FUNDING_SPEND_SEEN: case ONCHAIND_MUTUAL: /* If they try to reestablish channel, we'll send * error then */ goto return_to_gossipd; case CHANNELD_AWAITING_LOCKIN: case CHANNELD_NORMAL: case CHANNELD_SHUTTING_DOWN: /* Stop any existing daemon, without triggering error * on this peer. */ peer_set_owner(peer, NULL); peer->addr = addr; peer_start_channeld(peer, &cs, gossip_index, peer_fd, gossip_fd, NULL, true); goto connected; case CLOSINGD_SIGEXCHANGE: case CLOSINGD_COMPLETE: /* Stop any existing daemon, without triggering error * on this peer. */ peer_set_owner(peer, NULL); peer->addr = addr; peer_start_closingd(peer, &cs, gossip_index, peer_fd, gossip_fd, true); goto connected; } abort(); } return_to_gossipd: /* Otherwise, we hand back to gossipd, to continue. */ msg = towire_gossipctl_hand_back_peer(msg, &id, &cs, gossip_index, NULL); subd_send_msg(ld->gossip, take(msg)); subd_send_fd(ld->gossip, peer_fd); subd_send_fd(ld->gossip, gossip_fd); connected: /* If we were waiting for connection, we succeeded. */ connect_succeeded(ld, &id); return; send_error: /* Hand back to gossipd, with an error packet. */ connect_failed(ld, &id, sanitize_error(msg, error, NULL)); msg = towire_gossipctl_hand_back_peer(msg, &id, &cs, gossip_index, error); subd_send_msg(ld->gossip, take(msg)); subd_send_fd(ld->gossip, peer_fd); subd_send_fd(ld->gossip, gossip_fd); } /* Gossipd tells us peer was already connected. */ void peer_already_connected(struct lightningd *ld, const u8 *msg) { struct pubkey id; if (!fromwire_gossip_peer_already_connected(msg, NULL, &id)) fatal("Gossip gave bad GOSSIP_PEER_ALREADY_CONNECTED message %s", tal_hex(msg, msg)); /* If we were waiting for connection, we succeeded. */ connect_succeeded(ld, &id); } void peer_connection_failed(struct lightningd *ld, const u8 *msg) { struct pubkey id; u32 attempts, timediff; struct connect *i, *next; bool addr_unknown; char *error; if (!fromwire_gossip_peer_connection_failed(msg, NULL, &id, &timediff, &attempts, &addr_unknown)) fatal( "Gossip gave bad GOSSIP_PEER_CONNECTION_FAILED message %s", tal_hex(msg, msg)); if (addr_unknown) { error = tal_fmt( msg, "No address known for node %s, please provide one", type_to_string(msg, struct pubkey, &id)); } else { error = tal_fmt(msg, "Could not connect to %s after %d seconds and %d attempts", type_to_string(msg, struct pubkey, &id), timediff, attempts); } /* Careful! Completing command frees connect. */ list_for_each_safe(&ld->connects, i, next, list) { if (!pubkey_eq(&i->id, &id)) continue; command_fail(i->cmd, "%s", error); } } void peer_sent_nongossip(struct lightningd *ld, const struct pubkey *id, const struct wireaddr *addr, const struct crypto_state *cs, u64 gossip_index, 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; /* FIXME: match state too; we can have multiple onchain * (ie. dead) channels for the same peer. */ peer = peer_by_id(ld, id); if (peer) { error = towire_errorfmt(ld, channel_id, "Unexpected message %i in state %s", fromwire_peektype(in_msg), peer_state_name(peer->state)); goto send_error; } /* Open request? */ if (fromwire_peektype(in_msg) == WIRE_OPEN_CHANNEL) { peer_accept_channel(ld, id, addr, cs, gossip_index, gfeatures, lfeatures, peer_fd, gossip_fd, in_msg); return; } /* Weird request. */ error = towire_errorfmt(ld, channel_id, "Unexpected message %i for unknown peer", fromwire_peektype(in_msg)); send_error: /* Hand back to gossipd, with an error packet. */ connect_failed(ld, id, sanitize_error(error, error, NULL)); msg = towire_gossipctl_hand_back_peer(ld, id, cs, gossip_index, error); subd_send_msg(ld->gossip, take(msg)); subd_send_fd(ld->gossip, peer_fd); subd_send_fd(ld->gossip, gossip_fd); tal_free(error); } /* 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, const char *str, struct peer *peer) { if (continued) log_add(peer->ld->log, "%s ... %s", prefix, str); else log_(peer->ld->log, level, "%s %s", prefix, str); } void populate_peer(struct lightningd *ld, struct peer *peer) { const char *idname; struct pubkey *id = &peer->id; idname = type_to_string(peer, struct pubkey, id); peer->ld = ld; /* Max 128k per peer. */ peer->log_book = new_log_book(peer, 128*1024, get_log_level(ld->log_book)); peer->log = new_log(peer, peer->log_book, "peer %s:", idname); set_log_outfn(peer->log_book, copy_to_parent_log, peer); tal_free(idname); tal_add_destructor(peer, destroy_peer); } 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; } static void json_connect(struct command *cmd, const char *buffer, const jsmntok_t *params) { jsmntok_t *hosttok, *porttok, *idtok; struct pubkey id; const char *name; struct wireaddr addr; u8 *msg; if (!json_get_params(cmd, buffer, params, "id", &idtok, "?host", &hosttok, "?port", &porttok, NULL)) { return; } if (!json_tok_pubkey(buffer, idtok, &id)) { command_fail(cmd, "id %.*s not valid", idtok->end - idtok->start, buffer + idtok->start); return; } if (porttok && !hosttok) { command_fail(cmd, "Can't specify port without host"); return; } if (hosttok) { name = tal_strndup(cmd, buffer + hosttok->start, hosttok->end - hosttok->start); if (porttok) { u32 port; if (!json_tok_number(buffer, porttok, &port)) { command_fail(cmd, "port %.*s not valid", porttok->end - porttok->start, buffer + porttok->start); return; } addr.port = port; } else { addr.port = DEFAULT_PORT; } if (!parse_wireaddr(name, &addr, addr.port) || !addr.port) { command_fail(cmd, "host %s:%u not valid", name, addr.port); return; } /* Tell it about the address. */ msg = towire_gossipctl_peer_addrhint(cmd, &id, &addr); subd_send_msg(cmd->ld->gossip, take(msg)); } /* Now tell it to try reaching it. */ msg = towire_gossipctl_reach_peer(cmd, &id); subd_send_msg(cmd->ld->gossip, take(msg)); /* Leave this here for gossip_peer_connected */ new_connect(cmd->ld, &id, cmd); command_still_pending(cmd); } static const struct json_command connect_command = { "connect", json_connect, "Connect to {id} at {host} (which can end in ':port' if not default)" }; AUTODATA(json_command, &connect_command); struct log_info { enum log_level level; struct json_result *response; }; /* FIXME: Share this with jsonrpc.c's code! */ static void log_to_json(unsigned int skipped, struct timerel diff, enum log_level level, const char *prefix, const char *log, struct log_info *info) { if (level < info->level) return; if (level != LOG_IO) json_add_string(info->response, NULL, log); } 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 gossipd_getpeers_complete(struct subd *gossip, const u8 *msg, const int *fds, struct getpeers_args *gpa) { /* This is a little sneaky... */ struct pubkey *ids; struct wireaddr *addrs; struct json_result *response = new_json_result(gpa->cmd); struct peer *p; if (!fromwire_gossip_getpeers_reply(msg, msg, NULL, &ids, &addrs)) { command_fail(gpa->cmd, "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; if (gpa->specific_id && !pubkey_eq(gpa->specific_id, &p->id)) continue; json_object_start(response, NULL); json_add_pubkey(response, "id", &p->id); connected = (p->owner != NULL && !peer_state_on_chain(p->state)); json_add_bool(response, "connected", connected); if (connected) { json_array_start(response, "netaddr"); if (p->addr.type != ADDR_TYPE_PADDING) json_add_string(response, NULL, type_to_string(response, struct wireaddr, &p->addr)); json_array_end(response); } /* FIXME: We only support one channel per peer, but API must * support multiple already! */ json_array_start(response, "channels"); json_object_start(response, NULL); json_add_string(response, "state", peer_state_name(p->state)); if (p->owner) json_add_string(response, "owner", p->owner->name); if (p->scid) json_add_short_channel_id(response, "short_channel_id", p->scid); if (p->funding_txid) json_add_txid(response, "funding_txid", p->funding_txid); if (p->our_msatoshi) { json_add_u64(response, "msatoshi_to_us", *p->our_msatoshi); json_add_u64(response, "msatoshi_total", p->funding_satoshi * 1000); } /* channel config */ json_add_u64(response, "dust_limit_satoshis", p->our_config.dust_limit_satoshis); json_add_u64(response, "max_htlc_value_in_flight_msat", p->our_config.max_htlc_value_in_flight_msat); json_add_u64(response, "channel_reserve_satoshis", p->our_config.channel_reserve_satoshis); json_add_u64(response, "htlc_minimum_msat", p->our_config.htlc_minimum_msat); json_add_num(response, "to_self_delay", p->our_config.to_self_delay); json_add_num(response, "max_accepted_htlcs", p->our_config.max_accepted_htlcs); json_object_end(response); json_array_end(response); if (gpa->ll) { struct log_info info; info.level = *gpa->ll; info.response = response; json_array_start(response, "log"); log_each_line(p->log_book, log_to_json, &info); json_array_end(response); } 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_array_start(response, "netaddr"); if (addrs[i].type != ADDR_TYPE_PADDING) json_add_string(response, NULL, type_to_string(response, struct wireaddr, 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) { jsmntok_t *leveltok; struct getpeers_args *gpa = tal(cmd, struct getpeers_args); jsmntok_t *idtok; gpa->cmd = cmd; gpa->specific_id = NULL; if (!json_get_params(cmd, buffer, params, "?id", &idtok, "?level", &leveltok, NULL)) { return; } if (idtok) { gpa->specific_id = tal_arr(cmd, struct pubkey, 1); if (!json_tok_pubkey(buffer, idtok, gpa->specific_id)) { command_fail(cmd, "id %.*s not valid", idtok->end - idtok->start, buffer + idtok->start); return; } } if (leveltok) { gpa->ll = tal(gpa, enum log_level); if (json_tok_streq(buffer, leveltok, "debug")) *gpa->ll = LOG_DBG; else if (json_tok_streq(buffer, leveltok, "info")) *gpa->ll = LOG_INFORM; else if (json_tok_streq(buffer, leveltok, "unusual")) *gpa->ll = LOG_UNUSUAL; else if (json_tok_streq(buffer, leveltok, "broken")) *gpa->ll = LOG_BROKEN; else { command_fail(cmd, "Invalid level param"); return; } } else gpa->ll = NULL; /* 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 {log}s" }; AUTODATA(json_command, &listpeers_command); struct peer *peer_from_json(struct lightningd *ld, const char *buffer, jsmntok_t *peeridtok) { struct pubkey peerid; if (!json_tok_pubkey(buffer, peeridtok, &peerid)) return NULL; return peer_by_id(ld, &peerid); } struct funding_channel { struct command *cmd; /* Which also owns us. */ /* Peer we're trying to reach. */ struct pubkey peerid; /* Details of how to make funding. */ const struct utxo **utxomap; u64 change; u32 change_keyindex; u64 funding_satoshi, push_msat; /* Peer, once we have one. */ struct peer *peer; }; static void funding_broadcast_failed(struct peer *peer, int exitstatus, const char *err) { peer_internal_error(peer, "Funding broadcast exited with %i: %s", exitstatus, err); } static enum watch_result funding_announce_cb(struct peer *peer, const struct bitcoin_tx *tx, unsigned int depth, void *unused) { if (depth < ANNOUNCE_MIN_DEPTH) { return KEEP_WATCHING; } if (!peer->owner || !streq(peer->owner->name, "lightning_channeld")) { log_debug(peer->log, "Funding tx announce ready, but peer state %s" " owned by %s", peer_state_name(peer->state), peer->owner ? peer->owner->name : "none"); return KEEP_WATCHING; } subd_send_msg(peer->owner, take(towire_channel_funding_announce_depth(peer))); return DELETE_WATCH; } /* We dump all the known preimages when onchaind starts up. */ static void onchaind_tell_fulfill(struct peer *peer) { struct htlc_in_map_iter ini; struct htlc_in *hin; u8 *msg; for (hin = htlc_in_map_first(&peer->ld->htlcs_in, &ini); hin; hin = htlc_in_map_next(&peer->ld->htlcs_in, &ini)) { if (hin->key.peer != peer) continue; /* BOLT #5: * * If the node receives (or already knows) a payment preimage * for an unresolved HTLC output it was offered for which it * has committed to an outgoing HTLC, it MUST *resolve* the * output by spending it. Otherwise, if the other node is not * irrevocably committed to the HTLC, it MUST NOT *resolve* * the output by spending it. */ /* We only set preimage once it's irrevocably committed, and * we spend even if we don't have an outgoing HTLC (eg. local * payment complete) */ if (!hin->preimage) continue; msg = towire_onchain_known_preimage(peer, hin->preimage); subd_send_msg(peer->owner, take(msg)); } } static void handle_onchain_init_reply(struct peer *peer, const u8 *msg) { u8 state; if (!fromwire_onchain_init_reply(msg, NULL, &state)) { peer_internal_error(peer, "Invalid onchain_init_reply"); return; } if (!peer_state_on_chain(state)) { peer_internal_error(peer, "Invalid onchain_init_reply state %u (%s)", state, peer_state_name(state)); return; } peer_set_condition(peer, FUNDING_SPEND_SEEN, state); /* Tell it about any preimages we know. */ onchaind_tell_fulfill(peer); } static enum watch_result onchain_tx_watched(struct peer *peer, const struct bitcoin_tx *tx, unsigned int depth, void *unused) { u8 *msg; struct bitcoin_txid txid; if (depth == 0) { log_unusual(peer->log, "Chain reorganization!"); peer_set_owner(peer, NULL); /* FIXME! topology_rescan(peer->ld->topology, peer->funding_txid); */ /* We will most likely be freed, so this is a noop */ return KEEP_WATCHING; } bitcoin_txid(tx, &txid); msg = towire_onchain_depth(peer, &txid, depth); subd_send_msg(peer->owner, take(msg)); return KEEP_WATCHING; } static void watch_tx_and_outputs(struct peer *peer, const struct bitcoin_tx *tx); static enum watch_result onchain_txo_watched(struct peer *peer, const struct bitcoin_tx *tx, size_t input_num, const struct block *block, void *unused) { u8 *msg; watch_tx_and_outputs(peer, tx); msg = towire_onchain_spent(peer, tx, input_num, block->height); subd_send_msg(peer->owner, take(msg)); /* We don't need to keep watching: If this output is double-spent * (reorg), we'll get a zero depth cb to onchain_tx_watched, and * restart onchaind. */ return DELETE_WATCH; } /* To avoid races, we watch the tx and all outputs. */ static void watch_tx_and_outputs(struct peer *peer, const struct bitcoin_tx *tx) { struct bitcoin_txid txid; struct txwatch *txw; bitcoin_txid(tx, &txid); /* Make txwatch a parent of txo watches, so we can unwatch together. */ txw = watch_tx(peer->owner, peer->ld->topology, peer, tx, onchain_tx_watched, NULL); for (size_t i = 0; i < tal_count(tx->output); i++) watch_txo(txw, peer->ld->topology, peer, &txid, i, onchain_txo_watched, NULL); } static void handle_onchain_broadcast_tx(struct peer *peer, const u8 *msg) { struct bitcoin_tx *tx; tx = tal(msg, struct bitcoin_tx); if (!fromwire_onchain_broadcast_tx(msg, NULL, tx)) { peer_internal_error(peer, "Invalid onchain_broadcast_tx"); return; } /* We don't really care if it fails, we'll respond via watch. */ broadcast_tx(peer->ld->topology, peer, tx, NULL); } static void handle_onchain_unwatch_tx(struct peer *peer, const u8 *msg) { struct bitcoin_txid txid; struct txwatch *txw; if (!fromwire_onchain_unwatch_tx(msg, NULL, &txid)) { peer_internal_error(peer, "Invalid onchain_unwatch_tx"); return; } /* Frees the txo watches, too: see watch_tx_and_outputs() */ txw = find_txwatch(peer->ld->topology, &txid, peer); if (!txw) log_unusual(peer->log, "Can't unwatch txid %s", type_to_string(ltmp, struct bitcoin_txid, &txid)); tal_free(txw); } static void handle_extracted_preimage(struct peer *peer, const u8 *msg) { struct preimage preimage; if (!fromwire_onchain_extracted_preimage(msg, NULL, &preimage)) { peer_internal_error(peer, "Invalid extracted_preimage"); return; } onchain_fulfilled_htlc(peer, &preimage); } static void handle_missing_htlc_output(struct peer *peer, const u8 *msg) { struct htlc_stub htlc; if (!fromwire_onchain_missing_htlc_output(msg, NULL, &htlc)) { peer_internal_error(peer, "Invalid missing_htlc_output"); return; } /* BOLT #5: * * For any committed HTLC which does not have an output in this * commitment transaction, the node MUST fail the corresponding * incoming HTLC (if any) once the commitment transaction has reached * reasonable depth, and MAY fail it sooner if no valid commitment * transaction contains an output corresponding to the HTLC. */ onchain_failed_our_htlc(peer, &htlc, "missing in commitment tx"); } static void handle_onchain_htlc_timeout(struct peer *peer, const u8 *msg) { struct htlc_stub htlc; if (!fromwire_onchain_htlc_timeout(msg, NULL, &htlc)) { peer_internal_error(peer, "Invalid onchain_htlc_timeout"); return; } /* BOLT #5: * * If the HTLC output has *timed out* and not been *resolved*, the node * MUST *resolve* the output and MUST fail the corresponding incoming * HTLC (if any) once the resolving transaction has reached reasonable * depth. */ onchain_failed_our_htlc(peer, &htlc, "timed out"); } /* If peer is NULL, free them all (for shutdown) */ void free_htlcs(struct lightningd *ld, const struct peer *peer) { struct htlc_out_map_iter outi; struct htlc_out *hout; struct htlc_in_map_iter ini; struct htlc_in *hin; bool deleted; /* FIXME: Implement check_htlcs to ensure no dangling hout->in ptrs! */ do { deleted = false; for (hout = htlc_out_map_first(&ld->htlcs_out, &outi); hout; hout = htlc_out_map_next(&ld->htlcs_out, &outi)) { if (peer && hout->key.peer != peer) continue; tal_free(hout); deleted = true; } for (hin = htlc_in_map_first(&ld->htlcs_in, &ini); hin; hin = htlc_in_map_next(&ld->htlcs_in, &ini)) { if (peer && hin->key.peer != peer) continue; tal_free(hin); deleted = true; } /* Can skip over elements due to iterating while deleting. */ } while (deleted); } static void handle_irrevocably_resolved(struct peer *peer, const u8 *msg) { /* FIXME: Implement check_htlcs to ensure no dangling hout->in ptrs! */ free_htlcs(peer->ld, peer); log_info(peer->log, "onchaind complete, forgetting peer"); wallet_channel_delete(peer->ld->wallet, peer->channel->id); /* This will also free onchaind. */ free_peer(peer, "onchaind complete, forgetting peer"); } /** * onchain_add_utxo -- onchaind is telling us about a UTXO we own */ static void onchain_add_utxo(struct peer *peer, const u8 *msg) { struct utxo *u = tal(msg, struct utxo); u->close_info = tal(u, struct unilateral_close_info); u->is_p2sh = true; u->keyindex = 0; u->status = output_state_available; u->close_info->channel_id = peer->channel->id; u->close_info->peer_id = peer->id; if (!fromwire_onchain_add_utxo(msg, NULL, &u->txid, &u->outnum, &u->close_info->commitment_point, &u->amount)) { fatal("onchaind gave invalid add_utxo message: %s", tal_hex(msg, msg)); } wallet_add_utxo(peer->ld->wallet, u, p2wpkh); } static unsigned int onchain_msg(struct subd *sd, const u8 *msg, const int *fds) { enum onchain_wire_type t = fromwire_peektype(msg); switch (t) { case WIRE_ONCHAIN_INIT_REPLY: handle_onchain_init_reply(sd->peer, msg); break; case WIRE_ONCHAIN_BROADCAST_TX: handle_onchain_broadcast_tx(sd->peer, msg); break; case WIRE_ONCHAIN_UNWATCH_TX: handle_onchain_unwatch_tx(sd->peer, msg); break; case WIRE_ONCHAIN_EXTRACTED_PREIMAGE: handle_extracted_preimage(sd->peer, msg); break; case WIRE_ONCHAIN_MISSING_HTLC_OUTPUT: handle_missing_htlc_output(sd->peer, msg); break; case WIRE_ONCHAIN_HTLC_TIMEOUT: handle_onchain_htlc_timeout(sd->peer, msg); break; case WIRE_ONCHAIN_ALL_IRREVOCABLY_RESOLVED: handle_irrevocably_resolved(sd->peer, msg); break; case WIRE_ONCHAIN_ADD_UTXO: onchain_add_utxo(sd->peer, msg); break; /* We send these, not receive them */ case WIRE_ONCHAIN_INIT: case WIRE_ONCHAIN_SPENT: case WIRE_ONCHAIN_DEPTH: case WIRE_ONCHAIN_HTLC: case WIRE_ONCHAIN_KNOWN_PREIMAGE: break; } return 0; } static 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); } /* If we want to know if this HTLC is missing, return depth. */ static bool tell_if_missing(const struct peer *peer, struct htlc_stub *stub, bool *tell_immediate) { struct htlc_out *hout; /* Keep valgrind happy. */ *tell_immediate = false; /* Is it a current HTLC? */ hout = find_htlc_out_by_ripemd(peer, &stub->ripemd); if (!hout) return false; /* BOLT #5: * * For any committed HTLC which does not have an output in this * commitment transaction, the node MUST fail the corresponding * incoming HTLC (if any) once the commitment transaction has reached * reasonable depth, and MAY fail it sooner if no valid commitment * transaction contains an output corresponding to the HTLC. */ if (hout->hstate >= RCVD_ADD_REVOCATION && hout->hstate < SENT_REMOVE_REVOCATION) *tell_immediate = true; log_debug(peer->log, "We want to know if htlc %"PRIu64" is missing (%s)", hout->key.id, *tell_immediate ? "immediate" : "later"); return true; } /* With a reorg, this can get called multiple times; each time we'll kill * onchaind (like any other owner), and restart */ static enum watch_result funding_spent(struct peer *peer, const struct bitcoin_tx *tx, size_t input_num, const struct block *block, void *unused) { u8 *msg, *scriptpubkey; struct bitcoin_txid our_last_txid; s64 keyindex; struct pubkey ourkey; struct htlc_stub *stubs; const tal_t *tmpctx = tal_tmpctx(peer); peer_fail_permanent(peer, "Funding transaction spent"); /* We could come from almost any state. */ peer_set_condition(peer, peer->state, FUNDING_SPEND_SEEN); peer_set_owner(peer, new_peer_subd(peer->ld, "lightning_onchaind", peer, onchain_wire_type_name, onchain_msg, NULL)); if (!peer->owner) { log_broken(peer->log, "Could not subdaemon onchain: %s", strerror(errno)); tal_free(tmpctx); return KEEP_WATCHING; } stubs = wallet_htlc_stubs(tmpctx, peer->ld->wallet, peer->channel); if (!stubs) { log_broken(peer->log, "Could not load htlc_stubs"); tal_free(tmpctx); return KEEP_WATCHING; } /* We re-use this key to send other outputs to. */ if (peer->local_shutdown_idx >= 0) keyindex = peer->local_shutdown_idx; else { keyindex = wallet_get_newindex(peer->ld); if (keyindex < 0) { log_broken(peer->log, "Could not get keyindex"); tal_free(tmpctx); return KEEP_WATCHING; } } scriptpubkey = p2wpkh_for_keyidx(tmpctx, peer->ld, keyindex); if (!scriptpubkey) { peer_internal_error(peer, "Can't get shutdown script %"PRIu64, keyindex); tal_free(tmpctx); return DELETE_WATCH; } txfilter_add_scriptpubkey(peer->ld->owned_txfilter, scriptpubkey); if (!bip32_pubkey(peer->ld->wallet->bip32_base, &ourkey, keyindex)) { peer_internal_error(peer, "Can't get shutdown key %"PRIu64, keyindex); tal_free(tmpctx); return DELETE_WATCH; } /* This could be a mutual close, but it doesn't matter. */ bitcoin_txid(peer->last_tx, &our_last_txid); msg = towire_onchain_init(peer, peer->seed, &peer->their_shachain.chain, peer->funding_satoshi, &peer->channel_info->old_remote_per_commit, &peer->channel_info->remote_per_commit, /* BOLT #2: * `to_self_delay` is the number of blocks * that the other nodes to-self outputs * must be delayed */ /* So, these are reversed: they specify ours, * we specify theirs. */ peer->channel_info->their_config.to_self_delay, peer->our_config.to_self_delay, get_feerate(peer->ld->topology, FEERATE_NORMAL), peer->our_config.dust_limit_satoshis, &peer->channel_info->theirbase.revocation, &our_last_txid, scriptpubkey, peer->remote_shutdown_scriptpubkey, &ourkey, peer->funder, &peer->channel_info->theirbase.payment, &peer->channel_info->theirbase.htlc, &peer->channel_info->theirbase.delayed_payment, tx, block->height, /* FIXME: config for 'reasonable depth' */ 3, peer->last_htlc_sigs, tal_count(stubs)); subd_send_msg(peer->owner, take(msg)); /* FIXME: Don't queue all at once, use an empty cb... */ for (size_t i = 0; i < tal_count(stubs); i++) { bool tell_immediate; bool tell = tell_if_missing(peer, &stubs[i], &tell_immediate); msg = towire_onchain_htlc(peer, &stubs[i], tell, tell_immediate); subd_send_msg(peer->owner, take(msg)); } watch_tx_and_outputs(peer, tx); tal_free(tmpctx); /* We keep watching until peer finally deleted, for reorgs. */ return KEEP_WATCHING; } static enum watch_result funding_lockin_cb(struct peer *peer, const struct bitcoin_tx *tx, unsigned int depth, void *unused) { struct bitcoin_txid txid; const char *txidstr; struct txlocator *loc; bool peer_ready; bitcoin_txid(tx, &txid); txidstr = type_to_string(peer, struct bitcoin_txid, &txid); log_debug(peer->log, "Funding tx %s depth %u of %u", txidstr, depth, peer->minimum_depth); tal_free(txidstr); if (depth < peer->minimum_depth) return KEEP_WATCHING; loc = locate_tx(peer, peer->ld->topology, &txid); /* If we restart, we could already have peer->scid from database */ if (!peer->scid) { peer->scid = tal(peer, struct short_channel_id); peer->scid->blocknum = loc->blkheight; peer->scid->txnum = loc->index; peer->scid->outnum = peer->funding_outnum; } tal_free(loc); /* In theory, it could have been buried before we got back * from accepting openingd or disconnected: just wait for next one. */ peer_ready = (peer->owner && peer->state == CHANNELD_AWAITING_LOCKIN); if (!peer_ready) { log_debug(peer->log, "Funding tx confirmed, but peer state %s %s", peer_state_name(peer->state), peer->owner ? peer->owner->name : "unowned"); } else { subd_send_msg(peer->owner, take(towire_channel_funding_locked(peer, peer->scid))); } /* BOLT #7: * * If the `open_channel` message had the `announce_channel` bit set, * then both nodes must send the `announcement_signatures` message, * otherwise they MUST NOT. */ if (!(peer->channel_flags & CHANNEL_FLAGS_ANNOUNCE_CHANNEL)) return DELETE_WATCH; /* Tell channeld that we have reached the announce_depth and * that it may send the announcement_signatures upon receiving * funding_locked, or right now if it already received it * before. If we are at the right depth, call the callback * directly, otherwise schedule a callback */ if (depth >= ANNOUNCE_MIN_DEPTH) funding_announce_cb(peer, tx, depth, NULL); else watch_txid(peer, peer->ld->topology, peer, &txid, funding_announce_cb, NULL); return DELETE_WATCH; } static void opening_got_hsm_funding_sig(struct funding_channel *fc, int peer_fd, int gossip_fd, const u8 *resp, const struct crypto_state *cs, u64 gossip_index) { struct bitcoin_tx *tx = tal(fc, struct bitcoin_tx); u8 *linear; u64 change_satoshi; struct json_result *response = new_json_result(fc->cmd); if (!fromwire_hsm_sign_funding_reply(resp, NULL, tx)) fatal("HSM gave bad sign_funding_reply %s", tal_hex(fc, resp)); /* Send it out and watch for confirms. */ broadcast_tx(fc->peer->ld->topology, fc->peer, tx, funding_broadcast_failed); watch_tx(fc->peer, fc->peer->ld->topology, fc->peer, tx, funding_lockin_cb, NULL); /* Extract the change output and add it to the DB */ wallet_extract_owned_outputs(fc->peer->ld->wallet, tx, &change_satoshi); /* FIXME: Remove arg from cb? */ watch_txo(fc->peer, fc->peer->ld->topology, fc->peer, fc->peer->funding_txid, fc->peer->funding_outnum, funding_spent, NULL); json_object_start(response, NULL); linear = linearize_tx(response, tx); json_add_hex(response, "tx", linear, tal_len(linear)); json_add_txid(response, "txid", fc->peer->funding_txid); json_object_end(response); command_success(fc->peer->opening_cmd, response); fc->peer->opening_cmd = NULL; /* Start normal channel daemon. */ peer_start_channeld(fc->peer, cs, gossip_index, peer_fd, gossip_fd, NULL, false); peer_set_condition(fc->peer, OPENINGD, CHANNELD_AWAITING_LOCKIN); wallet_confirm_utxos(fc->peer->ld->wallet, fc->utxomap); tal_free(fc); } /* We were informed by channeld that it announced the channel and sent * an update, so we can now start sending a node_announcement. The * first step is to build the provisional announcement and ask the HSM * to sign it. */ static void peer_got_funding_locked(struct peer *peer, const u8 *msg) { struct pubkey next_per_commitment_point; if (!fromwire_channel_got_funding_locked(msg, NULL, &next_per_commitment_point)) { peer_internal_error(peer, "bad channel_got_funding_locked %s", tal_hex(peer, msg)); return; } if (peer->remote_funding_locked) { peer_internal_error(peer, "channel_got_funding_locked twice"); return; } update_per_commit_point(peer, &next_per_commitment_point); log_debug(peer->log, "Got funding_locked"); peer->remote_funding_locked = true; } static void peer_got_shutdown(struct peer *peer, const u8 *msg) { u8 *scriptpubkey; if (!fromwire_channel_got_shutdown(peer, msg, NULL, &scriptpubkey)) { peer_internal_error(peer, "bad channel_got_shutdown %s", tal_hex(peer, msg)); return; } /* FIXME: Add to spec that we must allow repeated shutdown! */ tal_free(peer->remote_shutdown_scriptpubkey); peer->remote_shutdown_scriptpubkey = scriptpubkey; /* BOLT #2: * * A sending node MUST set `scriptpubkey` to one of the following forms: * * 1. `OP_DUP` `OP_HASH160` `20` 20-bytes `OP_EQUALVERIFY` `OP_CHECKSIG` * (pay to pubkey hash), OR * 2. `OP_HASH160` `20` 20-bytes `OP_EQUAL` (pay to script hash), OR * 3. `OP_0` `20` 20-bytes (version 0 pay to witness pubkey), OR * 4. `OP_0` `32` 32-bytes (version 0 pay to witness script hash) * * A receiving node SHOULD fail the connection if the `scriptpubkey` * is not one of those forms. */ if (!is_p2pkh(scriptpubkey, NULL) && !is_p2sh(scriptpubkey, NULL) && !is_p2wpkh(scriptpubkey, NULL) && !is_p2wsh(scriptpubkey, NULL)) { peer_fail_permanent(peer, "Bad shutdown scriptpubkey %s", tal_hex(peer, scriptpubkey)); return; } if (peer->local_shutdown_idx == -1) { u8 *scriptpubkey; peer->local_shutdown_idx = wallet_get_newindex(peer->ld); if (peer->local_shutdown_idx == -1) { peer_internal_error(peer, "Can't get local shutdown index"); return; } peer_set_condition(peer, CHANNELD_NORMAL, CHANNELD_SHUTTING_DOWN); /* BOLT #2: * * A sending node MUST set `scriptpubkey` to one of the * following forms: * * ...3. `OP_0` `20` 20-bytes (version 0 pay to witness pubkey), */ scriptpubkey = p2wpkh_for_keyidx(msg, peer->ld, peer->local_shutdown_idx); if (!scriptpubkey) { peer_internal_error(peer, "Can't get shutdown script %"PRIu64, peer->local_shutdown_idx); return; } txfilter_add_scriptpubkey(peer->ld->owned_txfilter, scriptpubkey); /* BOLT #2: * * A receiving node MUST reply to a `shutdown` message with a * `shutdown` once there are no outstanding updates on the * peer, unless it has already sent a `shutdown`. */ subd_send_msg(peer->owner, take(towire_channel_send_shutdown(peer, scriptpubkey))); } /* TODO(cdecker) Selectively save updated fields to DB */ wallet_channel_save(peer->ld->wallet, peer->channel, 0); } void peer_last_tx(struct peer *peer, struct bitcoin_tx *tx, const secp256k1_ecdsa_signature *sig) { tal_free(peer->last_sig); peer->last_sig = tal_dup(peer, secp256k1_ecdsa_signature, sig); tal_free(peer->last_tx); peer->last_tx = tal_steal(peer, tx); } /* Is this better than the last tx we were holding? */ static bool better_closing_fee(struct peer *peer, const struct bitcoin_tx *tx) { u64 weight, fee, last_fee, ideal_fee, min_fee; s64 old_diff, new_diff; size_t i; /* Calculate actual fee. */ fee = peer->funding_satoshi; for (i = 0; i < tal_count(tx->output); i++) fee -= tx->output[i].amount; last_fee = peer->funding_satoshi; for (i = 0; i < tal_count(peer->last_tx); i++) last_fee -= peer->last_tx->output[i].amount; /* Weight once we add in sigs. */ weight = measure_tx_cost(tx) + 74 * 2; min_fee = get_feerate(peer->ld->topology, FEERATE_SLOW) * weight / 1000; if (fee < min_fee) return false; ideal_fee = get_feerate(peer->ld->topology, FEERATE_NORMAL) * weight / 1000; /* We prefer fee which is closest to our ideal. */ old_diff = imaxabs((s64)ideal_fee - (s64)last_fee); new_diff = imaxabs((s64)ideal_fee - (s64)fee); return (new_diff < old_diff); } static void peer_received_closing_signature(struct peer *peer, const u8 *msg) { secp256k1_ecdsa_signature sig; struct bitcoin_tx *tx = tal(msg, struct bitcoin_tx); if (!fromwire_closing_received_signature(msg, NULL, &sig, tx)) { peer_internal_error(peer, "Bad closing_received_signature %s", tal_hex(peer, msg)); return; } /* FIXME: Make sure signature is correct! */ if (better_closing_fee(peer, tx)) { peer_last_tx(peer, tx, &sig); /* TODO(cdecker) Selectively save updated fields to DB */ wallet_channel_save(peer->ld->wallet, peer->channel, 0); } /* OK, you can continue now. */ subd_send_msg(peer->owner, take(towire_closing_received_signature_reply(peer))); } static void peer_closing_complete(struct peer *peer, const u8 *msg) { /* FIXME: We should save this, to return to gossipd */ u64 gossip_index; if (!fromwire_closing_complete(msg, NULL, &gossip_index)) { peer_internal_error(peer, "Bad closing_complete %s", tal_hex(peer, msg)); return; } /* Retransmission only, ignore closing. */ if (peer->state == CLOSINGD_COMPLETE) return; drop_to_chain(peer); peer_set_condition(peer, CLOSINGD_SIGEXCHANGE, CLOSINGD_COMPLETE); } static unsigned closing_msg(struct subd *sd, const u8 *msg, const int *fds) { enum closing_wire_type t = fromwire_peektype(msg); switch (t) { case WIRE_CLOSING_RECEIVED_SIGNATURE: peer_received_closing_signature(sd->peer, msg); break; case WIRE_CLOSING_COMPLETE: peer_closing_complete(sd->peer, msg); break; /* We send these, not receive them */ case WIRE_CLOSING_INIT: case WIRE_CLOSING_RECEIVED_SIGNATURE_REPLY: break; } return 0; } static void peer_start_closingd(struct peer *peer, struct crypto_state *cs, u64 gossip_index, int peer_fd, int gossip_fd, bool reconnected) { const tal_t *tmpctx = tal_tmpctx(peer); u8 *initmsg, *local_scriptpubkey; u64 minfee, maxfee, startfee, feelimit; u64 num_revocations; u64 funding_msatoshi, our_msatoshi, their_msatoshi; if (peer->local_shutdown_idx == -1 || !peer->remote_shutdown_scriptpubkey) { peer_internal_error(peer, "Can't start closing: local %s remote %s", peer->local_shutdown_idx == -1 ? "not shutdown" : "shutdown", peer->remote_shutdown_scriptpubkey ? "shutdown" : "not shutdown"); tal_free(tmpctx); return; } peer_set_owner(peer, new_peer_subd(peer->ld, "lightning_closingd", peer, closing_wire_type_name, closing_msg, take(&peer_fd), take(&gossip_fd), NULL)); if (!peer->owner) { log_unusual(peer->log, "Could not subdaemon closing: %s", strerror(errno)); peer_fail_transient(peer, "Failed to subdaemon closing"); tal_free(tmpctx); return; } local_scriptpubkey = p2wpkh_for_keyidx(tmpctx, peer->ld, peer->local_shutdown_idx); if (!local_scriptpubkey) { peer_internal_error(peer, "Can't generate local shutdown scriptpubkey"); tal_free(tmpctx); return; } /* BOLT #2: * * A sending node MUST set `fee_satoshis` lower than or equal * to the base fee of the final commitment transaction as * calculated in [BOLT * #3](03-transactions.md#fee-calculation). */ feelimit = commit_tx_base_fee(peer->channel_info->feerate_per_kw[LOCAL], 0); maxfee = commit_tx_base_fee(get_feerate(peer->ld->topology, FEERATE_IMMEDIATE), 0); minfee = commit_tx_base_fee(get_feerate(peer->ld->topology, FEERATE_SLOW), 0); startfee = commit_tx_base_fee(get_feerate(peer->ld->topology, FEERATE_NORMAL), 0); if (maxfee > feelimit) maxfee = feelimit; if (startfee > feelimit) startfee = feelimit; if (minfee > feelimit) minfee = feelimit; num_revocations = revocations_received(&peer->their_shachain.chain); /* BOLT #3: * * The amounts for each output MUST BE rounded down to whole satoshis. */ /* Convert unit */ funding_msatoshi = peer->funding_satoshi * 1000; /* What is not ours is theirs */ our_msatoshi = *peer->our_msatoshi; their_msatoshi = funding_msatoshi - our_msatoshi; initmsg = towire_closing_init(tmpctx, cs, gossip_index, peer->seed, peer->funding_txid, peer->funding_outnum, peer->funding_satoshi, &peer->channel_info->remote_fundingkey, peer->funder, our_msatoshi / 1000, /* Rounds down */ their_msatoshi / 1000, /* Rounds down */ peer->our_config.dust_limit_satoshis, minfee, maxfee, startfee, local_scriptpubkey, peer->remote_shutdown_scriptpubkey, reconnected, peer->next_index[LOCAL], peer->next_index[REMOTE], num_revocations); /* We don't expect a response: it will give us feedback on * signatures sent and received, then closing_complete. */ subd_send_msg(peer->owner, take(initmsg)); tal_free(tmpctx); } static void peer_start_closingd_after_shutdown(struct peer *peer, const u8 *msg, const int *fds) { struct crypto_state cs; u64 gossip_index; /* We expect 2 fds. */ assert(tal_count(fds) == 2); if (!fromwire_channel_shutdown_complete(msg, NULL, &cs, &gossip_index)) { peer_internal_error(peer, "bad shutdown_complete: %s", tal_hex(peer, msg)); return; } /* This sets peer->owner, closes down channeld. */ peer_start_closingd(peer, &cs, gossip_index, fds[0], fds[1], false); peer_set_condition(peer, CHANNELD_SHUTTING_DOWN, CLOSINGD_SIGEXCHANGE); } static unsigned channel_msg(struct subd *sd, const u8 *msg, const int *fds) { enum channel_wire_type t = fromwire_peektype(msg); switch (t) { case WIRE_CHANNEL_NORMAL_OPERATION: peer_set_condition(sd->peer, CHANNELD_AWAITING_LOCKIN, CHANNELD_NORMAL); break; case WIRE_CHANNEL_SENDING_COMMITSIG: peer_sending_commitsig(sd->peer, msg); break; case WIRE_CHANNEL_GOT_COMMITSIG: peer_got_commitsig(sd->peer, msg); break; case WIRE_CHANNEL_GOT_REVOKE: peer_got_revoke(sd->peer, msg); break; case WIRE_CHANNEL_GOT_FUNDING_LOCKED: peer_got_funding_locked(sd->peer, msg); break; case WIRE_CHANNEL_GOT_SHUTDOWN: peer_got_shutdown(sd->peer, msg); break; case WIRE_CHANNEL_SHUTDOWN_COMPLETE: /* We expect 2 fds. */ if (!fds) return 2; peer_start_closingd_after_shutdown(sd->peer, msg, fds); break; /* And we never get these from channeld. */ case WIRE_CHANNEL_INIT: case WIRE_CHANNEL_FUNDING_LOCKED: case WIRE_CHANNEL_FUNDING_ANNOUNCE_DEPTH: case WIRE_CHANNEL_OFFER_HTLC: case WIRE_CHANNEL_FULFILL_HTLC: case WIRE_CHANNEL_FAIL_HTLC: case WIRE_CHANNEL_PING: case WIRE_CHANNEL_GOT_COMMITSIG_REPLY: case WIRE_CHANNEL_GOT_REVOKE_REPLY: case WIRE_CHANNEL_SENDING_COMMITSIG_REPLY: case WIRE_CHANNEL_SEND_SHUTDOWN: case WIRE_CHANNEL_DEV_REENABLE_COMMIT: case WIRE_CHANNEL_FEERATES: /* Replies go to requests. */ case WIRE_CHANNEL_OFFER_HTLC_REPLY: case WIRE_CHANNEL_PING_REPLY: case WIRE_CHANNEL_DEV_REENABLE_COMMIT_REPLY: break; } return 0; } u32 feerate_min(struct lightningd *ld) { if (ld->config.ignore_fee_limits) return 1; /* Set this to average of slow and normal.*/ return (get_feerate(ld->topology, FEERATE_SLOW) + get_feerate(ld->topology, FEERATE_NORMAL)) / 2; } /* 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) * 5; } static bool peer_start_channeld(struct peer *peer, const struct crypto_state *cs, u64 gossip_index, int peer_fd, int gossip_fd, const u8 *funding_signed, bool reconnected) { const tal_t *tmpctx = tal_tmpctx(peer); u8 *msg, *initmsg; int hsmfd; const struct config *cfg = &peer->ld->config; struct added_htlc *htlcs; enum htlc_state *htlc_states; struct fulfilled_htlc *fulfilled_htlcs; enum side *fulfilled_sides; struct failed_htlc *failed_htlcs; enum side *failed_sides; struct short_channel_id funding_channel_id; const u8 *shutdown_scriptpubkey; u64 num_revocations; /* Now we can consider balance set. */ if (!reconnected) { assert(!peer->our_msatoshi); peer->our_msatoshi = tal(peer, u64); if (peer->funder == LOCAL) *peer->our_msatoshi = peer->funding_satoshi * 1000 - peer->push_msat; else *peer->our_msatoshi = peer->push_msat; } else assert(peer->our_msatoshi); msg = towire_hsm_client_hsmfd(tmpctx, &peer->id, HSM_CAP_SIGN_GOSSIP | HSM_CAP_ECDH); if (!wire_sync_write(peer->ld->hsm_fd, take(msg))) fatal("Could not write to HSM: %s", strerror(errno)); msg = hsm_sync_read(tmpctx, peer->ld); if (!fromwire_hsm_client_hsmfd_reply(msg, NULL)) fatal("Bad reply from HSM: %s", tal_hex(tmpctx, msg)); hsmfd = fdpass_recv(peer->ld->hsm_fd); if (hsmfd < 0) fatal("Could not read fd from HSM: %s", strerror(errno)); peer_set_owner(peer, new_peer_subd(peer->ld, "lightning_channeld", peer, channel_wire_type_name, channel_msg, take(&peer_fd), take(&gossip_fd), take(&hsmfd), NULL)); if (!peer->owner) { log_unusual(peer->log, "Could not subdaemon channel: %s", strerror(errno)); peer_fail_transient(peer, "Failed to subdaemon channel"); tal_free(tmpctx); return true; } peer_htlcs(tmpctx, peer, &htlcs, &htlc_states, &fulfilled_htlcs, &fulfilled_sides, &failed_htlcs, &failed_sides); if (peer->scid) { funding_channel_id = *peer->scid; log_debug(peer->log, "Already have funding locked in"); } else { log_debug(peer->log, "Waiting for funding confirmations"); memset(&funding_channel_id, 0, sizeof(funding_channel_id)); } if (peer->local_shutdown_idx != -1) { shutdown_scriptpubkey = p2wpkh_for_keyidx(tmpctx, peer->ld, peer->local_shutdown_idx); } else shutdown_scriptpubkey = NULL; num_revocations = revocations_received(&peer->their_shachain.chain); /* Warn once. */ if (peer->ld->config.ignore_fee_limits) log_debug(peer->log, "Ignoring fee limits!"); peer->direction = get_channel_direction(&peer->ld->id, &peer->id); initmsg = towire_channel_init(tmpctx, &get_chainparams(peer->ld) ->genesis_blockhash, peer->funding_txid, peer->funding_outnum, peer->funding_satoshi, &peer->our_config, &peer->channel_info->their_config, peer->channel_info->feerate_per_kw, feerate_min(peer->ld), feerate_max(peer->ld), peer->last_sig, cs, gossip_index, &peer->channel_info->remote_fundingkey, &peer->channel_info->theirbase.revocation, &peer->channel_info->theirbase.payment, &peer->channel_info->theirbase.htlc, &peer->channel_info->theirbase.delayed_payment, &peer->channel_info->remote_per_commit, &peer->channel_info->old_remote_per_commit, peer->funder, cfg->fee_base, cfg->fee_per_satoshi, *peer->our_msatoshi, peer->seed, &peer->ld->id, &peer->id, time_to_msec(cfg->commit_time), cfg->cltv_expiry_delta, peer->last_was_revoke, peer->last_sent_commit, peer->next_index[LOCAL], peer->next_index[REMOTE], num_revocations, peer->next_htlc_id, htlcs, htlc_states, fulfilled_htlcs, fulfilled_sides, failed_htlcs, failed_sides, peer->scid != NULL, peer->remote_funding_locked, &funding_channel_id, reconnected, shutdown_scriptpubkey, peer->remote_shutdown_scriptpubkey != NULL, peer->channel_flags, funding_signed); /* We don't expect a response: we are triggered by funding_depth_cb. */ subd_send_msg(peer->owner, take(initmsg)); tal_free(tmpctx); return true; } static bool peer_commit_initial(struct peer *peer) { peer->next_index[LOCAL] = peer->next_index[REMOTE] = 1; return true; } static void opening_funder_finished(struct subd *opening, const u8 *resp, const int *fds, struct funding_channel *fc) { tal_t *tmpctx = tal_tmpctx(fc); u8 *msg; struct channel_info *channel_info; struct utxo *utxos; struct bitcoin_tx *fundingtx; struct bitcoin_txid funding_txid; struct pubkey changekey; struct pubkey local_fundingkey; struct crypto_state cs; secp256k1_ecdsa_signature remote_commit_sig; struct bitcoin_tx *remote_commit; u64 gossip_index; assert(tal_count(fds) == 2); /* At this point, we care about peer */ fc->peer->channel_info = channel_info = tal(fc->peer, struct channel_info); remote_commit = tal(resp, struct bitcoin_tx); /* This is a new channel_info->their_config so set its ID to 0 */ fc->peer->channel_info->their_config.id = 0; if (!fromwire_opening_funder_reply(resp, NULL, &channel_info->their_config, remote_commit, &remote_commit_sig, &cs, &gossip_index, &channel_info->theirbase.revocation, &channel_info->theirbase.payment, &channel_info->theirbase.htlc, &channel_info->theirbase.delayed_payment, &channel_info->remote_per_commit, &fc->peer->minimum_depth, &channel_info->remote_fundingkey, &funding_txid, &channel_info->feerate_per_kw[REMOTE])) { peer_internal_error(fc->peer, "bad funder_reply: %s", tal_hex(resp, resp)); return; } /* Feerates begin identical. */ channel_info->feerate_per_kw[LOCAL] = channel_info->feerate_per_kw[REMOTE]; /* old_remote_per_commit not valid yet, copy valid one. */ channel_info->old_remote_per_commit = channel_info->remote_per_commit; /* Now, keep the initial commit as our last-tx-to-broadcast. */ peer_last_tx(fc->peer, remote_commit, &remote_commit_sig); /* Generate the funding tx. */ if (fc->change && !bip32_pubkey(fc->peer->ld->wallet->bip32_base, &changekey, fc->change_keyindex)) fatal("Error deriving change key %u", fc->change_keyindex); derive_basepoints(fc->peer->seed, &local_fundingkey, NULL, NULL, NULL); fundingtx = funding_tx(tmpctx, &fc->peer->funding_outnum, fc->utxomap, fc->peer->funding_satoshi, &local_fundingkey, &channel_info->remote_fundingkey, fc->change, &changekey, fc->peer->ld->wallet->bip32_base); log_debug(fc->peer->log, "Funding tx has %zi inputs, %zu outputs:", tal_count(fundingtx->input), tal_count(fundingtx->output)); for (size_t i = 0; i < tal_count(fundingtx->input); i++) { log_debug(fc->peer->log, "%zi: %"PRIu64" satoshi (%s) %s\n", i, fc->utxomap[i]->amount, fc->utxomap[i]->is_p2sh ? "P2SH" : "SEGWIT", type_to_string(ltmp, struct bitcoin_txid, &fundingtx->input[i].txid)); } fc->peer->funding_txid = tal(fc->peer, struct bitcoin_txid); bitcoin_txid(fundingtx, fc->peer->funding_txid); if (!structeq(fc->peer->funding_txid, &funding_txid)) { peer_internal_error(fc->peer, "Funding txid mismatch:" " satoshi %"PRIu64" change %"PRIu64 " changeidx %u" " localkey %s remotekey %s", fc->peer->funding_satoshi, fc->change, fc->change_keyindex, type_to_string(fc, struct pubkey, &local_fundingkey), type_to_string(fc, struct pubkey, &channel_info->remote_fundingkey)); return; } if (!peer_commit_initial(fc->peer)) { peer_internal_error(fc->peer, "Initial peer to db failed"); return; } /* Get HSM to sign the funding tx. */ log_debug(fc->peer->log, "Getting HSM to sign funding tx"); utxos = from_utxoptr_arr(tmpctx, fc->utxomap); msg = towire_hsm_sign_funding(tmpctx, fc->peer->funding_satoshi, fc->change, fc->change_keyindex, &local_fundingkey, &channel_info->remote_fundingkey, utxos); /* Unowned (will free openingd). */ peer_set_owner(fc->peer, NULL); if (!wire_sync_write(fc->peer->ld->hsm_fd, take(msg))) fatal("Could not write to HSM: %s", strerror(errno)); tal_free(tmpctx); msg = hsm_sync_read(fc, fc->peer->ld); opening_got_hsm_funding_sig(fc, fds[0], fds[1], msg, &cs, gossip_index); } static void opening_fundee_finished(struct subd *opening, const u8 *reply, const int *fds, struct peer *peer) { u8 *funding_signed; struct channel_info *channel_info; struct crypto_state cs; u64 gossip_index; secp256k1_ecdsa_signature remote_commit_sig; struct bitcoin_tx *remote_commit; const tal_t *tmpctx = tal_tmpctx(peer); log_debug(peer->log, "Got opening_fundee_finish_response"); assert(tal_count(fds) == 2); remote_commit = tal(reply, struct bitcoin_tx); /* At this point, we care about peer */ peer->channel_info = channel_info = tal(peer, struct channel_info); /* This is a new channel_info->their_config, set its ID to 0 */ peer->channel_info->their_config.id = 0; peer->funding_txid = tal(peer, struct bitcoin_txid); if (!fromwire_opening_fundee_reply(tmpctx, reply, NULL, &channel_info->their_config, remote_commit, &remote_commit_sig, &cs, &gossip_index, &channel_info->theirbase.revocation, &channel_info->theirbase.payment, &channel_info->theirbase.htlc, &channel_info->theirbase.delayed_payment, &channel_info->remote_per_commit, &channel_info->remote_fundingkey, peer->funding_txid, &peer->funding_outnum, &peer->funding_satoshi, &peer->push_msat, &peer->channel_flags, &channel_info->feerate_per_kw[REMOTE], &funding_signed)) { peer_internal_error(peer, "bad OPENING_FUNDEE_REPLY %s", tal_hex(reply, reply)); tal_free(tmpctx); return; } /* Feerates begin identical. */ channel_info->feerate_per_kw[LOCAL] = channel_info->feerate_per_kw[REMOTE]; /* old_remote_per_commit not valid yet, copy valid one. */ channel_info->old_remote_per_commit = channel_info->remote_per_commit; /* Now, keep the initial commit as our last-tx-to-broadcast. */ peer_last_tx(peer, remote_commit, &remote_commit_sig); if (!peer_commit_initial(peer)) { tal_free(tmpctx); return; } log_debug(peer->log, "Watching funding tx %s", type_to_string(reply, struct bitcoin_txid, peer->funding_txid)); watch_txid(peer, peer->ld->topology, peer, peer->funding_txid, funding_lockin_cb, NULL); /* FIXME: Remove arg from cb? */ watch_txo(peer, peer->ld->topology, peer, peer->funding_txid, peer->funding_outnum, funding_spent, NULL); /* Unowned (will free openingd). */ peer_set_owner(peer, NULL); /* On to normal operation! */ peer_start_channeld(peer, &cs, gossip_index, fds[0], fds[1], funding_signed, false); peer_set_condition(peer, OPENINGD, CHANNELD_AWAITING_LOCKIN); tal_free(tmpctx); } /* Negotiation failed, but we can keep gossipping */ static unsigned int opening_negotiation_failed(struct subd *openingd, const u8 *msg, const int *fds) { struct crypto_state cs; u64 gossip_index; struct peer *peer = openingd->peer; u8 *err; const char *why; /* We need the peer fd and gossip fd. */ if (tal_count(fds) == 0) return 2; if (!fromwire_opening_negotiation_failed(msg, msg, NULL, &cs, &gossip_index, &err)) { peer_internal_error(peer, "bad OPENING_NEGOTIATION_FAILED %s", tal_hex(msg, msg)); return 0; } msg = towire_gossipctl_hand_back_peer(msg, &peer->id, &cs, gossip_index, NULL); subd_send_msg(openingd->ld->gossip, take(msg)); subd_send_fd(openingd->ld->gossip, fds[0]); subd_send_fd(openingd->ld->gossip, fds[1]); why = tal_strndup(peer, (const char *)err, tal_len(err)); log_unusual(peer->log, "Opening negotiation failed: %s", why); /* This will free openingd, since that's peer->owner */ free_peer(peer, why); return 0; } /* Peer has spontaneously exited from gossip due to open msg */ static void peer_accept_channel(struct lightningd *ld, const struct pubkey *peer_id, const struct wireaddr *addr, const struct crypto_state *cs, u64 gossip_index, const u8 *gfeatures, const u8 *lfeatures, int peer_fd, int gossip_fd, const u8 *open_msg) { u32 max_to_self_delay, max_minimum_depth; u64 min_effective_htlc_capacity_msat; u8 *msg; struct peer *peer; assert(fromwire_peektype(open_msg) == WIRE_OPEN_CHANNEL); /* We make a new peer. */ peer = new_peer(ld, peer_id, addr, gfeatures, lfeatures, peer_fd); peer_set_condition(peer, UNINITIALIZED, OPENINGD); peer_set_owner(peer, new_peer_subd(ld, "lightning_openingd", peer, opening_wire_type_name, opening_negotiation_failed, take(&peer_fd), take(&gossip_fd), NULL)); if (!peer->owner) { peer_fail_transient(peer, "Failed to subdaemon opening: %s", strerror(errno)); return; } /* They will open channel. */ peer->funder = REMOTE; /* BOLT #2: * * The sender SHOULD set `minimum_depth` to a number of blocks it * considers reasonable to avoid double-spending of the funding * transaction. */ peer->minimum_depth = ld->config.anchor_confirms; channel_config(ld, &peer->our_config, &max_to_self_delay, &max_minimum_depth, &min_effective_htlc_capacity_msat); /* Store the channel in the database in order to get a channel * ID that is unique and which we can base the peer_seed on */ peer->channel = peer_channel_new(ld->wallet, peer); peer->seed = tal(peer, struct privkey); derive_peer_seed(ld, peer->seed, &peer->id, peer->channel->id); msg = towire_opening_init(peer, get_chainparams(ld)->index, &peer->our_config, max_to_self_delay, min_effective_htlc_capacity_msat, cs, gossip_index, peer->seed); subd_send_msg(peer->owner, take(msg)); /* 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 */ msg = towire_opening_fundee(peer, peer->minimum_depth, get_feerate(ld->topology, FEERATE_SLOW), get_feerate(ld->topology, FEERATE_IMMEDIATE) * 5, open_msg); subd_req(peer, peer->owner, take(msg), -1, 2, opening_fundee_finished, peer); } static void peer_offer_channel(struct lightningd *ld, struct funding_channel *fc, const struct wireaddr *addr, const struct crypto_state *cs, u64 gossip_index, const u8 *gfeatures, const u8 *lfeatures, int peer_fd, int gossip_fd) { u8 *msg; u32 max_to_self_delay, max_minimum_depth; u64 min_effective_htlc_capacity_msat; struct utxo *utxos; /* We make a new peer. */ fc->peer = new_peer(ld, &fc->peerid, addr, gfeatures, lfeatures, peer_fd); fc->peer->funding_satoshi = fc->funding_satoshi; fc->peer->push_msat = fc->push_msat; peer_set_condition(fc->peer, UNINITIALIZED, OPENINGD); peer_set_owner(fc->peer, new_peer_subd(ld, "lightning_openingd", fc->peer, opening_wire_type_name, opening_negotiation_failed, take(&peer_fd), take(&gossip_fd), NULL)); if (!fc->peer->owner) { fc->peer = tal_free(fc->peer); command_fail(fc->cmd, "Failed to launch openingd: %s", strerror(errno)); return; } /* FIXME: This is wrong in several ways. * * 1. We should set the temporary channel id *now*, so that's the * key. * 2. We don't need the peer or channel in db until peer_persists(). */ /* Store the channel in the database in order to get a channel * ID that is unique and which we can base the peer_seed on */ fc->peer->channel = peer_channel_new(ld->wallet, fc->peer); fc->peer->seed = tal(fc->peer, struct privkey); derive_peer_seed(ld, fc->peer->seed, &fc->peer->id, fc->peer->channel->id); /* We will fund channel */ fc->peer->funder = LOCAL; channel_config(ld, &fc->peer->our_config, &max_to_self_delay, &max_minimum_depth, &min_effective_htlc_capacity_msat); fc->peer->channel_flags = OUR_CHANNEL_FLAGS; msg = towire_opening_init(fc, get_chainparams(ld)->index, &fc->peer->our_config, max_to_self_delay, min_effective_htlc_capacity_msat, cs, gossip_index, fc->peer->seed); subd_send_msg(fc->peer->owner, take(msg)); utxos = from_utxoptr_arr(fc, fc->utxomap); msg = towire_opening_funder(fc, fc->peer->funding_satoshi, fc->peer->push_msat, get_feerate(ld->topology, FEERATE_NORMAL), max_minimum_depth, fc->change, fc->change_keyindex, fc->peer->channel_flags, utxos, fc->peer->ld->wallet->bip32_base); /* Peer now owns fc; if it dies, we fail fc. */ tal_steal(fc->peer, fc); fc->peer->opening_cmd = fc->cmd; subd_req(fc, fc->peer->owner, take(msg), -1, 2, opening_funder_finished, fc); } /* Peer has been released from gossip. Start opening. */ static void gossip_peer_released(struct subd *gossip, const u8 *resp, const int *fds, struct funding_channel *fc) { struct lightningd *ld = gossip->ld; struct crypto_state cs; u64 gossip_index; u8 *gfeatures, *lfeatures; struct wireaddr addr; /* We could have raced with peer doing something else. */ fc->peer = peer_by_id(ld, &fc->peerid); if (!fromwire_gossipctl_release_peer_reply(fc, resp, NULL, &addr, &cs, &gossip_index, &gfeatures, &lfeatures)) { if (!fromwire_gossipctl_release_peer_replyfail(resp, NULL)) { fatal("Gossip daemon gave invalid reply %s", tal_hex(gossip, resp)); } if (fc->peer) command_fail(fc->cmd, "Peer already %s", peer_state_name(fc->peer->state)); else command_fail(fc->cmd, "Peer not connected"); return; } assert(tal_count(fds) == 2); /* We asked to release this peer, but another raced in? Corner case, * close this is easiest. */ if (fc->peer) { command_fail(fc->cmd, "Peer already %s", peer_state_name(fc->peer->state)); close(fds[0]); close(fds[1]); return; } /* OK, offer peer a channel. */ peer_offer_channel(ld, fc, &addr, &cs, gossip_index, gfeatures, lfeatures, fds[0], fds[1]); } static void json_fund_channel(struct command *cmd, const char *buffer, const jsmntok_t *params) { jsmntok_t *peertok, *satoshitok; struct funding_channel *fc = tal(cmd, struct funding_channel); u8 *msg; if (!json_get_params(cmd, buffer, params, "id", &peertok, "satoshi", &satoshitok, NULL)) { return; } fc->cmd = cmd; if (!pubkey_from_hexstr(buffer + peertok->start, peertok->end - peertok->start, &fc->peerid)) { command_fail(cmd, "Could not parse id"); return; } if (!json_tok_u64(buffer, satoshitok, &fc->funding_satoshi)) { command_fail(cmd, "Invalid satoshis"); return; } if (fc->funding_satoshi > MAX_FUNDING_SATOSHI) { command_fail(cmd, "Funding satoshi must be <= %d", MAX_FUNDING_SATOSHI); return; } /* FIXME: Support push_msat? */ fc->push_msat = 0; /* Try to do this now, so we know if insufficient funds. */ /* FIXME: dustlimit */ fc->utxomap = build_utxos(fc, cmd->ld, fc->funding_satoshi, get_feerate(cmd->ld->topology, FEERATE_NORMAL), 600, BITCOIN_SCRIPTPUBKEY_P2WSH_LEN, &fc->change, &fc->change_keyindex); if (!fc->utxomap) { command_fail(cmd, "Cannot afford funding transaction"); return; } msg = towire_gossipctl_release_peer(cmd, &fc->peerid); subd_req(fc, cmd->ld->gossip, msg, -1, 2, gossip_peer_released, fc); command_still_pending(cmd); } static const struct json_command fund_channel_command = { "fundchannel", json_fund_channel, "Fund channel with {id} using {satoshi} satoshis" }; AUTODATA(json_command, &fund_channel_command); static void json_close(struct command *cmd, const char *buffer, const jsmntok_t *params) { jsmntok_t *peertok; struct peer *peer; if (!json_get_params(cmd, buffer, params, "id", &peertok, NULL)) { return; } peer = peer_from_json(cmd->ld, buffer, peertok); if (!peer) { command_fail(cmd, "Could not find peer with that id"); return; } /* Easy case: peer can simply be forgotten. */ if (!peer_persists(peer)) { peer_fail_permanent(peer, "Peer closed in state %s", peer_state_name(peer->state)); command_success(cmd, null_response(cmd)); return; } /* Normal case. */ if (peer->state == CHANNELD_NORMAL) { u8 *shutdown_scriptpubkey; peer->local_shutdown_idx = wallet_get_newindex(peer->ld); if (peer->local_shutdown_idx == -1) { command_fail(cmd, "Failed to get new key for shutdown"); return; } shutdown_scriptpubkey = p2wpkh_for_keyidx(cmd, peer->ld, peer->local_shutdown_idx); if (!shutdown_scriptpubkey) { command_fail(cmd, "Failed to get script for shutdown"); return; } peer_set_condition(peer, CHANNELD_NORMAL, CHANNELD_SHUTTING_DOWN); txfilter_add_scriptpubkey(peer->ld->owned_txfilter, shutdown_scriptpubkey); if (peer->owner) subd_send_msg(peer->owner, take(towire_channel_send_shutdown(peer, shutdown_scriptpubkey))); command_success(cmd, null_response(cmd)); } else command_fail(cmd, "Peer is in state %s", peer_state_name(peer->state)); } static const struct json_command close_command = { "close", json_close, "Close the channel with peer {id}" }; AUTODATA(json_command, &close_command); const char *peer_state_name(enum peer_state state) { size_t i; for (i = 0; enum_peer_state_names[i].name; i++) if (enum_peer_state_names[i].v == state) return enum_peer_state_names[i].name; return "unknown"; } static void activate_peer(struct peer *peer) { u8 *msg; assert(!peer->owner); /* 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)); /* FIXME: We should never have these in the database! */ if (!peer->funding_txid) { log_broken(peer->log, "activate_peer(%s) with no funding txid?", peer_state_name(peer->state)); return; } /* This may be unnecessary, but it's harmless. */ watch_txid(peer, peer->ld->topology, peer, peer->funding_txid, funding_lockin_cb, NULL); watch_txo(peer, peer->ld->topology, peer, peer->funding_txid, peer->funding_outnum, funding_spent, NULL); if (peer_wants_reconnect(peer)) { msg = towire_gossipctl_reach_peer(peer, &peer->id); subd_send_msg(peer->ld->gossip, take(msg)); } } void activate_peers(struct lightningd *ld) { struct peer *p; list_for_each(&ld->peers, p, list) activate_peer(p); } #if DEVELOPER static void json_sign_last_tx(struct command *cmd, const char *buffer, const jsmntok_t *params) { jsmntok_t *peertok; struct peer *peer; struct json_result *response = new_json_result(cmd); u8 *linear; if (!json_get_params(cmd, buffer, params, "id", &peertok, NULL)) { return; } peer = peer_from_json(cmd->ld, buffer, peertok); if (!peer) { command_fail(cmd, "Could not find peer with that id"); return; } if (!peer->last_tx) { command_fail(cmd, "Peer has no final transaction"); return; } log_debug(peer->log, "dev-sign-last-tx: signing tx with %zu outputs", tal_count(peer->last_tx->output)); sign_last_tx(peer); linear = linearize_tx(cmd, peer->last_tx); remove_sig(peer->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) { jsmntok_t *peertok; struct peer *peer; if (!json_get_params(cmd, buffer, params, "id", &peertok, NULL)) { return; } peer = peer_from_json(cmd->ld, buffer, peertok); if (!peer) { command_fail(cmd, "Could not find peer with that id"); return; } peer_internal_error(peer, "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, const u8 *resp, const int *fds, 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) { jsmntok_t *peertok; struct peer *peer; u8 *msg; if (!json_get_params(cmd, buffer, params, "id", &peertok, NULL)) { return; } peer = peer_from_json(cmd->ld, buffer, peertok); if (!peer) { command_fail(cmd, "Could not find peer with that id"); return; } if (!peer->owner) { command_fail(cmd, "Peer has no owner"); return; } if (!streq(peer->owner->name, "lightning_channeld")) { command_fail(cmd, "Peer owned by %s", peer->owner->name); return; } msg = towire_channel_dev_reenable_commit(peer); subd_req(peer, peer->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); #endif /* DEVELOPER */