#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define HSM_FD 3 #define CONNECTD_FD 4 #if DEVELOPER static u32 max_scids_encode_bytes = -1U; static bool suppress_gossip = false; #endif struct local_update { /* daemon->local_updates */ struct list_node list; /* Because we're handed to a one-arg timer */ struct daemon *daemon; /* Which channel this is */ struct short_channel_id scid; /* Which direction we own */ int direction; u16 cltv_delta; u64 htlc_minimum_msat; u32 fee_base_msat, fee_proportional_millionths; bool disable; }; struct daemon { /* Who am I? */ struct pubkey id; /* Peers we have directly or indirectly: id is unique */ struct list_head peers; /* Connection to main daemon. */ struct daemon_conn master; /* Connection to connect daemon. */ struct daemon_conn connectd; /* Routing information */ struct routing_state *rstate; struct timers timers; u32 broadcast_interval; /* Global features to list in node_announcement. */ u8 *globalfeatures; u8 alias[33]; u8 rgb[3]; /* What we can actually announce. */ struct wireaddr *announcable; /* To make sure our node_announcement timestamps increase */ u32 last_announce_timestamp; /* Unapplied local updates waiting for their timers. */ struct list_head local_updates; }; struct peer { struct daemon *daemon; /* daemon->peers */ struct list_node list; /* The ID of the peer (not necessarily unique, in transit!) */ struct pubkey id; bool gossip_queries_feature, initial_routing_sync_feature; /* High water mark for the staggered broadcast */ u64 broadcast_index; /* Timestamp range to filter gossip by */ u32 gossip_timestamp_min, gossip_timestamp_max; /* Are there outstanding queries on short_channel_ids? */ const struct short_channel_id *scid_queries; size_t scid_query_idx; /* Are there outstanding node_announcements from scid_queries? */ struct pubkey *scid_query_nodes; size_t scid_query_nodes_idx; /* If this is NULL, we're syncing gossip now. */ struct oneshot *gossip_timer; /* How many query responses are we expecting? */ size_t num_scid_queries_outstanding; /* How many pongs are we expecting? */ size_t num_pings_outstanding; /* Map of outstanding channel_range requests. */ u8 *query_channel_blocks; u32 first_channel_range; struct short_channel_id *query_channel_scids; /* FIXME: Doesn't need to be a pointer. */ struct daemon_conn *remote; }; /* FIXME: Reorder */ static void peer_disable_channels(struct daemon *daemon, struct node *node); static u8 *create_channel_update(const tal_t *ctx, struct routing_state *rstate, const struct chan *chan, int direction, bool disable, u16 cltv_expiry_delta, u64 htlc_minimum_msat, u32 fee_base_msat, u32 fee_proportional_millionths); static struct local_update *find_local_update(struct daemon *daemon, const struct short_channel_id *scid); static void destroy_peer(struct peer *peer) { struct node *node; list_del_from(&peer->daemon->peers, &peer->list); node = get_node(peer->daemon->rstate, &peer->id); if (node) peer_disable_channels(peer->daemon, node); } static struct peer *find_peer(struct daemon *daemon, const struct pubkey *id) { struct peer *peer; list_for_each(&daemon->peers, peer, list) if (pubkey_eq(&peer->id, id)) return peer; return NULL; } static u8 *encode_short_channel_ids_start(const tal_t *ctx) { u8 *encoded = tal_arr(ctx, u8, 0); towire_u8(&encoded, SHORTIDS_ZLIB); return encoded; } static void encode_add_short_channel_id(u8 **encoded, const struct short_channel_id *scid) { towire_short_channel_id(encoded, scid); } static u8 *zencode_scids(const tal_t *ctx, const u8 *scids, size_t len) { u8 *z; int err; unsigned long compressed_len = len; /* Prefer to fail if zlib makes it larger */ z = tal_arr(ctx, u8, len); err = compress2(z, &compressed_len, scids, len, Z_BEST_COMPRESSION); if (err == Z_OK) { status_trace("short_ids compressed %zu into %lu", len, compressed_len); tal_resize(&z, compressed_len); return z; } status_trace("short_ids compress %zu returned %i:" " not compresssing", len, err); return NULL; } static bool encode_short_channel_ids_end(u8 **encoded, size_t max_bytes) { u8 *z; switch ((enum scid_encode_types)(*encoded)[0]) { case SHORTIDS_ZLIB: z = zencode_scids(tmpctx, *encoded + 1, tal_count(*encoded) - 1); if (z) { tal_resize(encoded, 1 + tal_count(z)); memcpy((*encoded) + 1, z, tal_count(z)); goto check_length; } (*encoded)[0] = SHORTIDS_UNCOMPRESSED; /* Fall thru */ case SHORTIDS_UNCOMPRESSED: goto check_length; } status_failed(STATUS_FAIL_INTERNAL_ERROR, "Unknown short_ids encoding %u", (*encoded)[0]); check_length: #if DEVELOPER if (tal_count(*encoded) > max_scids_encode_bytes) return false; #endif return tal_count(*encoded) <= max_bytes; } static void queue_peer_msg(struct peer *peer, const u8 *msg TAKES) { const u8 *send = towire_gossip_send_gossip(NULL, msg); if (taken(msg)) tal_free(msg); daemon_conn_send(peer->remote, take(send)); } static void wake_gossip_out(struct peer *peer) { /* If we were waiting, we're not any more */ peer->gossip_timer = tal_free(peer->gossip_timer); /* Notify the daemon_conn-write loop */ daemon_conn_wake(peer->remote); } static void peer_error(struct peer *peer, const char *fmt, ...) { va_list ap; va_start(ap, fmt); status_trace("peer %s: %s", type_to_string(tmpctx, struct pubkey, &peer->id), tal_vfmt(tmpctx, fmt, ap)); va_end(ap); /* Send error: we'll close after writing this. */ va_start(ap, fmt); queue_peer_msg(peer, take(towire_errorfmtv(peer, NULL, fmt, ap))); va_end(ap); } static void setup_gossip_range(struct peer *peer) { u8 *msg; if (!peer->gossip_queries_feature) return; /* Tell it to start gossip! (And give us everything!) */ msg = towire_gossip_timestamp_filter(peer, &peer->daemon->rstate->chain_hash, 0, UINT32_MAX); queue_peer_msg(peer, take(msg)); } static bool nonlocal_dump_gossip(struct io_conn *conn, struct daemon_conn *dc); /* Create a node_announcement with the given signature. It may be NULL * in the case we need to create a provisional announcement for the * HSM to sign. This is typically called twice: once with the dummy * signature to get it signed and a second time to build the full * packet with the signature. The timestamp is handed in since that is * the only thing that may change between the dummy creation and the * call with a signature.*/ static u8 *create_node_announcement(const tal_t *ctx, struct daemon *daemon, secp256k1_ecdsa_signature *sig, u32 timestamp) { u8 *addresses = tal_arr(ctx, u8, 0); u8 *announcement; size_t i; if (!sig) { sig = tal(ctx, secp256k1_ecdsa_signature); memset(sig, 0, sizeof(*sig)); } for (i = 0; i < tal_count(daemon->announcable); i++) towire_wireaddr(&addresses, &daemon->announcable[i]); announcement = towire_node_announcement(ctx, sig, daemon->globalfeatures, timestamp, &daemon->id, daemon->rgb, daemon->alias, addresses); return announcement; } static void send_node_announcement(struct daemon *daemon) { u32 timestamp = time_now().ts.tv_sec; secp256k1_ecdsa_signature sig; u8 *msg, *nannounce, *err; /* Timestamps must move forward, or announce will be ignored! */ if (timestamp <= daemon->last_announce_timestamp) timestamp = daemon->last_announce_timestamp + 1; daemon->last_announce_timestamp = timestamp; nannounce = create_node_announcement(tmpctx, daemon, NULL, timestamp); if (!wire_sync_write(HSM_FD, take(towire_hsm_node_announcement_sig_req(NULL, nannounce)))) status_failed(STATUS_FAIL_MASTER_IO, "Could not write to HSM: %s", strerror(errno)); msg = wire_sync_read(tmpctx, HSM_FD); if (!fromwire_hsm_node_announcement_sig_reply(msg, &sig)) status_failed(STATUS_FAIL_MASTER_IO, "HSM returned an invalid node_announcement sig"); /* We got the signature for out provisional node_announcement back * from the HSM, create the real announcement and forward it to * gossipd so it can take care of forwarding it. */ nannounce = create_node_announcement(NULL, daemon, &sig, timestamp); err = handle_node_announcement(daemon->rstate, take(nannounce)); if (err) status_failed(STATUS_FAIL_INTERNAL_ERROR, "rejected own node announcement: %s", tal_hex(tmpctx, err)); } /* Should we announce our own node? */ static void maybe_send_own_node_announce(struct daemon *daemon) { if (!daemon->rstate->local_channel_announced) return; /* FIXME: We may not need to retransmit here, if previous still valid. */ send_node_announcement(daemon); daemon->rstate->local_channel_announced = false; } /** * Handle an incoming gossip message * * Returns wire formatted error if handling failed. The error contains the * details of the failures. The caller is expected to return the error to the * peer, or drop the error if the message did not come from a peer. */ static u8 *handle_gossip_msg(struct daemon *daemon, const u8 *msg, const char *source) { struct routing_state *rstate = daemon->rstate; int t = fromwire_peektype(msg); u8 *err; switch(t) { case WIRE_CHANNEL_ANNOUNCEMENT: { const struct short_channel_id *scid; /* If it's OK, tells us the short_channel_id to lookup */ err = handle_channel_announcement(rstate, msg, &scid); if (err) return err; else if (scid) daemon_conn_send(&daemon->master, take(towire_gossip_get_txout(NULL, scid))); break; } case WIRE_NODE_ANNOUNCEMENT: err = handle_node_announcement(rstate, msg); if (err) return err; break; case WIRE_CHANNEL_UPDATE: err = handle_channel_update(rstate, msg, source); if (err) return err; /* In case we just announced a new local channel. */ maybe_send_own_node_announce(daemon); break; } /* All good, no error to report */ return NULL; } static void handle_query_short_channel_ids(struct peer *peer, u8 *msg) { struct routing_state *rstate = peer->daemon->rstate; struct bitcoin_blkid chain; u8 *encoded; struct short_channel_id *scids; if (!fromwire_query_short_channel_ids(tmpctx, msg, &chain, &encoded)) { peer_error(peer, "Bad query_short_channel_ids %s", tal_hex(tmpctx, msg)); return; } if (!bitcoin_blkid_eq(&rstate->chain_hash, &chain)) { status_trace("%s sent query_short_channel_ids chainhash %s", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct bitcoin_blkid, &chain)); return; } /* BOLT #7: * * - if it has not sent `reply_short_channel_ids_end` to a * previously received `query_short_channel_ids` from this * sender: * - MAY fail the connection. */ if (peer->scid_queries || peer->scid_query_nodes) { peer_error(peer, "Bad concurrent query_short_channel_ids"); return; } scids = decode_short_ids(tmpctx, encoded); if (!scids) { peer_error(peer, "Bad query_short_channel_ids encoding %s", tal_hex(tmpctx, encoded)); return; } /* BOLT #7: * * - MUST respond to each known `short_channel_id` with a * `channel_announcement` and the latest `channel_update`s for each end * - SHOULD NOT wait for the next outgoing gossip flush to send * these. */ peer->scid_queries = tal_steal(peer, scids); peer->scid_query_idx = 0; peer->scid_query_nodes = tal_arr(peer, struct pubkey, 0); /* Notify the daemon_conn-write loop */ daemon_conn_wake(peer->remote); } static void handle_gossip_timestamp_filter(struct peer *peer, u8 *msg) { struct bitcoin_blkid chain_hash; u32 first_timestamp, timestamp_range; if (!fromwire_gossip_timestamp_filter(msg, &chain_hash, &first_timestamp, ×tamp_range)) { peer_error(peer, "Bad gossip_timestamp_filter %s", tal_hex(tmpctx, msg)); return; } if (!bitcoin_blkid_eq(&peer->daemon->rstate->chain_hash, &chain_hash)) { status_trace("%s sent gossip_timestamp_filter chainhash %s", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct bitcoin_blkid, &chain_hash)); return; } /* First time, start gossip sync immediately. */ if (peer->gossip_timestamp_min > peer->gossip_timestamp_max) wake_gossip_out(peer); /* FIXME: We don't index by timestamp, so this forces a brute * search! */ peer->gossip_timestamp_min = first_timestamp; peer->gossip_timestamp_max = first_timestamp + timestamp_range - 1; if (peer->gossip_timestamp_max < peer->gossip_timestamp_min) peer->gossip_timestamp_max = UINT32_MAX; peer->broadcast_index = 0; } static void reply_channel_range(struct peer *peer, u32 first_blocknum, u32 number_of_blocks, const u8 *encoded) { /* BOLT #7: * * - For each `reply_channel_range`: * - MUST set with `chain_hash` equal to that of `query_channel_range`, * - MUST encode a `short_channel_id` for every open channel it * knows in blocks `first_blocknum` to `first_blocknum` plus * `number_of_blocks` minus one. * - MUST limit `number_of_blocks` to the maximum number of blocks * whose results could fit in `encoded_short_ids` * - if does not maintain up-to-date channel information for * `chain_hash`: * - MUST set `complete` to 0. * - otherwise: * - SHOULD set `complete` to 1. */ u8 *msg = towire_reply_channel_range(NULL, &peer->daemon->rstate->chain_hash, first_blocknum, number_of_blocks, 1, encoded); queue_peer_msg(peer, take(msg)); } static void queue_channel_ranges(struct peer *peer, u32 first_blocknum, u32 number_of_blocks) { struct routing_state *rstate = peer->daemon->rstate; u8 *encoded = encode_short_channel_ids_start(tmpctx); struct short_channel_id scid; /* BOLT #7: * * 1. type: 264 (`reply_channel_range`) (`gossip_queries`) * 2. data: * * [`32`:`chain_hash`] * * [`4`:`first_blocknum`] * * [`4`:`number_of_blocks`] * * [`1`:`complete`] * * [`2`:`len`] * * [`len`:`encoded_short_ids`] */ const size_t reply_overhead = 32 + 4 + 4 + 1 + 2; const size_t max_encoded_bytes = 65535 - 2 - reply_overhead; /* Avoid underflow: we don't use block 0 anyway */ if (first_blocknum == 0) mk_short_channel_id(&scid, 1, 0, 0); else mk_short_channel_id(&scid, first_blocknum, 0, 0); scid.u64--; while (uintmap_after(&rstate->chanmap, &scid.u64)) { u32 blocknum = short_channel_id_blocknum(&scid); if (blocknum >= first_blocknum + number_of_blocks) break; encode_add_short_channel_id(&encoded, &scid); } if (encode_short_channel_ids_end(&encoded, max_encoded_bytes)) { reply_channel_range(peer, first_blocknum, number_of_blocks, encoded); return; } /* It wouldn't all fit: divide in half */ /* We assume we can always send one block! */ if (number_of_blocks <= 1) { /* We always assume we can send 1 blocks worth */ status_broken("Could not fit scids for single block %u", first_blocknum); return; } status_debug("queue_channel_ranges full: splitting %u+%u and %u+%u", first_blocknum, number_of_blocks / 2, first_blocknum + number_of_blocks / 2, number_of_blocks - number_of_blocks / 2); queue_channel_ranges(peer, first_blocknum, number_of_blocks / 2); queue_channel_ranges(peer, first_blocknum + number_of_blocks / 2, number_of_blocks - number_of_blocks / 2); } static void handle_query_channel_range(struct peer *peer, u8 *msg) { struct bitcoin_blkid chain_hash; u32 first_blocknum, number_of_blocks; if (!fromwire_query_channel_range(msg, &chain_hash, &first_blocknum, &number_of_blocks)) { peer_error(peer, "Bad query_channel_range %s", tal_hex(tmpctx, msg)); return; } if (!bitcoin_blkid_eq(&peer->daemon->rstate->chain_hash, &chain_hash)) { status_trace("%s sent query_channel_range chainhash %s", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct bitcoin_blkid, &chain_hash)); return; } if (first_blocknum + number_of_blocks < first_blocknum) { peer_error(peer, "query_channel_range overflow %u+%u", first_blocknum, number_of_blocks); return; } queue_channel_ranges(peer, first_blocknum, number_of_blocks); } static void handle_ping(struct peer *peer, u8 *ping) { u8 *pong; if (!check_ping_make_pong(NULL, ping, &pong)) { peer_error(peer, "Bad ping"); return; } if (pong) queue_peer_msg(peer, take(pong)); } static void handle_pong(struct peer *peer, const u8 *pong) { const char *err = got_pong(pong, &peer->num_pings_outstanding); if (err) { peer_error(peer, "%s", err); return; } daemon_conn_send(&peer->daemon->master, take(towire_gossip_ping_reply(NULL, true, tal_count(pong)))); } static void handle_reply_short_channel_ids_end(struct peer *peer, u8 *msg) { struct bitcoin_blkid chain; u8 complete; if (!fromwire_reply_short_channel_ids_end(msg, &chain, &complete)) { peer_error(peer, "Bad reply_short_channel_ids_end %s", tal_hex(tmpctx, msg)); return; } if (!bitcoin_blkid_eq(&peer->daemon->rstate->chain_hash, &chain)) { peer_error(peer, "reply_short_channel_ids_end for bad chain: %s", tal_hex(tmpctx, msg)); return; } if (peer->num_scid_queries_outstanding == 0) { peer_error(peer, "unexpected reply_short_channel_ids_end: %s", tal_hex(tmpctx, msg)); return; } peer->num_scid_queries_outstanding--; msg = towire_gossip_scids_reply(msg, true, complete); daemon_conn_send(&peer->daemon->master, take(msg)); } static void handle_reply_channel_range(struct peer *peer, u8 *msg) { struct bitcoin_blkid chain; u8 complete; u32 first_blocknum, number_of_blocks; u8 *encoded, *p; struct short_channel_id *scids; size_t n; if (!fromwire_reply_channel_range(tmpctx, msg, &chain, &first_blocknum, &number_of_blocks, &complete, &encoded)) { peer_error(peer, "Bad reply_channel_range %s", tal_hex(tmpctx, msg)); return; } if (!bitcoin_blkid_eq(&peer->daemon->rstate->chain_hash, &chain)) { peer_error(peer, "reply_channel_range for bad chain: %s", tal_hex(tmpctx, msg)); return; } if (!peer->query_channel_blocks) { peer_error(peer, "reply_channel_range without query: %s", tal_hex(tmpctx, msg)); return; } if (first_blocknum + number_of_blocks < first_blocknum) { peer_error(peer, "reply_channel_range invalid %u+%u", first_blocknum, number_of_blocks); return; } scids = decode_short_ids(tmpctx, encoded); if (!scids) { peer_error(peer, "Bad reply_channel_range encoding %s", tal_hex(tmpctx, encoded)); return; } n = first_blocknum - peer->first_channel_range; if (first_blocknum < peer->first_channel_range || n + number_of_blocks > tal_count(peer->query_channel_blocks)) { peer_error(peer, "reply_channel_range invalid %u+%u for query %u+%u", first_blocknum, number_of_blocks, peer->first_channel_range, tal_count(peer->query_channel_blocks)); return; } p = memchr(peer->query_channel_blocks + n, 1, number_of_blocks); if (p) { peer_error(peer, "reply_channel_range %u+%u already have block %zu", first_blocknum, number_of_blocks, peer->first_channel_range + (p - peer->query_channel_blocks)); return; } /* Mark these blocks received */ memset(peer->query_channel_blocks + n, 1, number_of_blocks); /* Add scids */ n = tal_count(peer->query_channel_scids); tal_resize(&peer->query_channel_scids, n + tal_count(scids)); memcpy(peer->query_channel_scids + n, scids, tal_bytelen(scids)); status_debug("peer %s reply_channel_range %u+%u (of %u+%zu) %zu scids", type_to_string(tmpctx, struct pubkey, &peer->id), first_blocknum, number_of_blocks, peer->first_channel_range, tal_count(peer->query_channel_blocks), tal_count(scids)); /* Still more to go? */ if (memchr(peer->query_channel_blocks, 0, tal_count(peer->query_channel_blocks))) return; /* All done, send reply */ msg = towire_gossip_query_channel_range_reply(NULL, first_blocknum, number_of_blocks, complete, peer->query_channel_scids); daemon_conn_send(&peer->daemon->master, take(msg)); peer->query_channel_scids = tal_free(peer->query_channel_scids); peer->query_channel_blocks = tal_free(peer->query_channel_blocks); } /* We keep a simple array of node ids while we're sending channel info */ static void append_query_node(struct peer *peer, const struct pubkey *id) { size_t n; n = tal_count(peer->scid_query_nodes); tal_resize(&peer->scid_query_nodes, n+1); peer->scid_query_nodes[n] = *id; } /* Arbitrary ordering function of pubkeys. * * Note that we could use memcmp() here: even if they had somehow different * bitwise representations for the same key, we copied them all from struct * node which should make them unique. Even if not (say, a node vanished * and reappeared) we'd just end up sending two node_announcement for the * same node. */ static int pubkey_order(const struct pubkey *k1, const struct pubkey *k2, void *unused UNUSED) { return pubkey_cmp(k1, k2); } static void uniquify_node_ids(struct pubkey **ids) { size_t dst, src; /* BOLT #7: * * - MUST follow with any `node_announcement`s for each * `channel_announcement` * * - SHOULD avoid sending duplicate `node_announcements` in * response to a single `query_short_channel_ids`. */ asort(*ids, tal_count(*ids), pubkey_order, NULL); for (dst = 0, src = 0; src < tal_count(*ids); src++) { if (dst && pubkey_eq(&(*ids)[dst-1], &(*ids)[src])) continue; (*ids)[dst++] = (*ids)[src]; } tal_resize(ids, dst); } static bool create_next_scid_reply(struct peer *peer) { struct routing_state *rstate = peer->daemon->rstate; size_t i, num; bool sent = false; /* BOLT #7: * * - MUST respond to each known `short_channel_id` with a * `channel_announcement` and the latest `channel_update`s for * each end * - SHOULD NOT wait for the next outgoing gossip flush * to send these. */ num = tal_count(peer->scid_queries); for (i = peer->scid_query_idx; !sent && i < num; i++) { struct chan *chan; chan = get_channel(rstate, &peer->scid_queries[i]); if (!chan || !is_chan_public(chan)) continue; queue_peer_msg(peer, chan->channel_announce); if (chan->half[0].channel_update) queue_peer_msg(peer, chan->half[0].channel_update); if (chan->half[1].channel_update) queue_peer_msg(peer, chan->half[1].channel_update); /* Record node ids for later transmission of node_announcement */ append_query_node(peer, &chan->nodes[0]->id); append_query_node(peer, &chan->nodes[1]->id); sent = true; } /* Just finished channels? Remove duplicate nodes. */ if (peer->scid_query_idx != num && i == num) uniquify_node_ids(&peer->scid_query_nodes); peer->scid_query_idx = i; /* BOLT #7: * * - MUST follow with any `node_announcement`s for each * `channel_announcement` * - SHOULD avoid sending duplicate `node_announcements` in response * to a single `query_short_channel_ids`. */ num = tal_count(peer->scid_query_nodes); for (i = peer->scid_query_nodes_idx; !sent && i < num; i++) { const struct node *n; n = get_node(rstate, &peer->scid_query_nodes[i]); if (!n || !n->node_announcement || !n->node_announcement_index) continue; queue_peer_msg(peer, n->node_announcement); sent = true; } peer->scid_query_nodes_idx = i; /* All finished? */ if (peer->scid_queries && peer->scid_query_nodes_idx == num) { /* BOLT #7: * * - MUST follow these responses with * `reply_short_channel_ids_end`. * - if does not maintain up-to-date channel information for * `chain_hash`: * - MUST set `complete` to 0. * - otherwise: * - SHOULD set `complete` to 1. */ u8 *end = towire_reply_short_channel_ids_end(peer, &rstate->chain_hash, true); queue_peer_msg(peer, take(end)); peer->scid_queries = tal_free(peer->scid_queries); peer->scid_query_idx = 0; peer->scid_query_nodes = tal_free(peer->scid_query_nodes); peer->scid_query_nodes_idx = 0; } return sent; } /* If we're supposed to be sending gossip, do so now. */ static bool maybe_queue_gossip(struct peer *peer) { const u8 *next; if (peer->gossip_timer) return false; #if DEVELOPER if (suppress_gossip) return false; #endif next = next_broadcast(peer->daemon->rstate->broadcasts, peer->gossip_timestamp_min, peer->gossip_timestamp_max, &peer->broadcast_index); if (next) { queue_peer_msg(peer, next); return true; } /* Gossip is drained. Wait for next timer. */ peer->gossip_timer = new_reltimer(&peer->daemon->timers, peer, time_from_msec(peer->daemon->broadcast_interval), wake_gossip_out, peer); return false; } static void handle_get_update(struct peer *peer, const u8 *msg) { struct short_channel_id scid; struct chan *chan; const u8 *update; struct routing_state *rstate = peer->daemon->rstate; if (!fromwire_gossip_get_update(msg, &scid)) { status_trace("peer %s sent bad gossip_get_update %s", type_to_string(tmpctx, struct pubkey, &peer->id), tal_hex(tmpctx, msg)); return; } chan = get_channel(rstate, &scid); if (!chan) { status_unusual("peer %s scid %s: unknown channel", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct short_channel_id, &scid)); update = NULL; } else { struct local_update *l; /* We want the update that comes from our end. */ if (pubkey_eq(&chan->nodes[0]->id, &peer->daemon->id)) update = chan->half[0].channel_update; else if (pubkey_eq(&chan->nodes[1]->id, &peer->daemon->id)) update = chan->half[1].channel_update; else { status_unusual("peer %s scid %s: not our channel?", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct short_channel_id, &scid)); update = NULL; goto out; } /* We might have a pending update which overrides: always send * that now, since this is used to populate errors which should * contain the latest information. */ l = find_local_update(peer->daemon, &scid); if (l) update = create_channel_update(tmpctx, rstate, chan, l->direction, l->disable, l->cltv_delta, l->htlc_minimum_msat, l->fee_base_msat, l->fee_proportional_millionths); } out: status_trace("peer %s schanid %s: %s update", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct short_channel_id, &scid), update ? "got" : "no"); msg = towire_gossip_get_update_reply(NULL, update); daemon_conn_send(peer->remote, take(msg)); } static u8 *create_channel_update(const tal_t *ctx, struct routing_state *rstate, const struct chan *chan, int direction, bool disable, u16 cltv_expiry_delta, u64 htlc_minimum_msat, u32 fee_base_msat, u32 fee_proportional_millionths) { secp256k1_ecdsa_signature dummy_sig; u8 *update, *msg; u32 timestamp = time_now().ts.tv_sec; u16 flags; /* So valgrind doesn't complain */ memset(&dummy_sig, 0, sizeof(dummy_sig)); /* Don't send duplicate timestamps. */ if (is_halfchan_defined(&chan->half[direction]) && timestamp == chan->half[direction].last_timestamp) timestamp++; flags = direction; if (disable) flags |= ROUTING_FLAGS_DISABLED; update = towire_channel_update(tmpctx, &dummy_sig, &rstate->chain_hash, &chan->scid, timestamp, flags, cltv_expiry_delta, htlc_minimum_msat, fee_base_msat, fee_proportional_millionths); if (!wire_sync_write(HSM_FD, towire_hsm_cupdate_sig_req(tmpctx, update))) { status_failed(STATUS_FAIL_HSM_IO, "Writing cupdate_sig_req: %s", strerror(errno)); } msg = wire_sync_read(tmpctx, HSM_FD); if (!msg || !fromwire_hsm_cupdate_sig_reply(ctx, msg, &update)) { status_failed(STATUS_FAIL_HSM_IO, "Reading cupdate_sig_req: %s", strerror(errno)); } return update; } /* Return true if the only change would be the timestamp. */ static bool update_redundant(const struct half_chan *hc, bool disable, u16 cltv_delta, u64 htlc_minimum_msat, u32 fee_base_msat, u32 fee_proportional_millionths) { if (!is_halfchan_defined(hc)) return false; return !(hc->flags & ROUTING_FLAGS_DISABLED) == !disable && hc->delay == cltv_delta && hc->htlc_minimum_msat == htlc_minimum_msat && hc->base_fee == fee_base_msat && hc->proportional_fee == fee_proportional_millionths; } static struct local_update *find_local_update(struct daemon *daemon, const struct short_channel_id *scid) { struct local_update *i; list_for_each(&daemon->local_updates, i, list) { if (short_channel_id_eq(scid, &i->scid)) return i; } return NULL; } /* Frees local_update */ static void apply_delayed_local_update(struct local_update *local_update) { struct chan *chan; const struct half_chan *hc; u8 *cupdate, *err; /* Can theoretically happen if channel just closed. */ chan = get_channel(local_update->daemon->rstate, &local_update->scid); if (!chan) { status_trace("Delayed local_channel_update for unknown %s", type_to_string(tmpctx, struct short_channel_id, &local_update->scid)); tal_free(local_update); return; } /* Convenience variable */ hc = &chan->half[local_update->direction]; /* Avoid redundant updates on public channels: on non-public channels * we'd need to consider pending updates, so don't bother. */ if (is_chan_public(chan) && update_redundant(hc, local_update->disable, local_update->cltv_delta, local_update->htlc_minimum_msat, local_update->fee_base_msat, local_update->fee_proportional_millionths)) { status_trace("Suppressing redundant channel update for %s:(%u) %s %"PRIu64"/%u vs %u/%u", type_to_string(tmpctx, struct short_channel_id, &local_update->scid), local_update->direction, is_halfchan_defined(hc) ? (hc->flags & ROUTING_FLAGS_DISABLED ? "DISABLED" : "ACTIVE") : "UNDEFINED", hc->last_timestamp, (u32)time_now().ts.tv_sec, hc->flags, local_update->disable); tal_free(local_update); return; } cupdate = create_channel_update(tmpctx, local_update->daemon->rstate, chan, local_update->direction, local_update->disable, local_update->cltv_delta, local_update->htlc_minimum_msat, local_update->fee_base_msat, local_update->fee_proportional_millionths); err = handle_channel_update(local_update->daemon->rstate, cupdate, "apply_delayed_local_update"); if (err) status_failed(STATUS_FAIL_INTERNAL_ERROR, "Rejected local channel update %s: %s", tal_hex(tmpctx, cupdate), tal_hex(tmpctx, err)); /* We always tell peer, even if it's not public yet */ if (!is_chan_public(chan)) { struct peer *peer = find_peer(local_update->daemon, &chan->nodes[!local_update ->direction]->id); if (peer) queue_peer_msg(peer, take(cupdate)); } status_trace("Channel update for %s(%u)%s", type_to_string(tmpctx, struct short_channel_id, &local_update->scid), local_update->direction, is_chan_public(chan) ? "" : " (private)"); /* That channel_update might trigger our first channel_announcement */ maybe_send_own_node_announce(local_update->daemon); tal_free(local_update); } static void destroy_local_update(struct local_update *local_update) { list_del_from(&local_update->daemon->local_updates, &local_update->list); } static void queue_local_update(struct daemon *daemon, struct local_update *local_update) { /* Free any old unapplied update. */ tal_free(find_local_update(daemon, &local_update->scid)); list_add_tail(&daemon->local_updates, &local_update->list); tal_add_destructor(local_update, destroy_local_update); /* Delay 1/4 a broadcast interval */ new_reltimer(&daemon->timers, local_update, time_from_msec(daemon->broadcast_interval/4), apply_delayed_local_update, local_update); } static void handle_local_channel_update(struct peer *peer, const u8 *msg) { struct chan *chan; struct local_update *local_update; const struct pubkey *my_id = &peer->daemon->rstate->local_id; local_update = tal(peer->daemon, struct local_update); local_update->daemon = peer->daemon; if (!fromwire_gossip_local_channel_update(msg, &local_update->scid, &local_update->disable, &local_update->cltv_delta, &local_update->htlc_minimum_msat, &local_update->fee_base_msat, &local_update->fee_proportional_millionths)) { status_broken("peer %s bad local_channel_update %s", type_to_string(tmpctx, struct pubkey, &peer->id), tal_hex(tmpctx, msg)); tal_free(local_update); return; } /* Can theoretically happen if channel just closed. */ chan = get_channel(peer->daemon->rstate, &local_update->scid); if (!chan) { status_trace("peer %s local_channel_update for unknown %s", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct short_channel_id, &local_update->scid)); tal_free(local_update); return; } if (pubkey_eq(&chan->nodes[0]->id, my_id)) local_update->direction = 0; else if (pubkey_eq(&chan->nodes[1]->id, my_id)) local_update->direction = 1; else { status_broken("peer %s bad local_channel_update for non-local %s", type_to_string(tmpctx, struct pubkey, &peer->id), type_to_string(tmpctx, struct short_channel_id, &local_update->scid)); tal_free(local_update); return; } /* channeld has reconnected, remove local disable. */ chan->local_disabled = false; queue_local_update(peer->daemon, local_update); } /** * owner_msg_in - Called by the `peer->remote` upon receiving a * message */ static struct io_plan *owner_msg_in(struct io_conn *conn, struct daemon_conn *dc) { struct peer *peer = dc->ctx; u8 *msg = dc->msg_in, *err; int type = fromwire_peektype(msg); if (type == WIRE_CHANNEL_ANNOUNCEMENT || type == WIRE_CHANNEL_UPDATE || type == WIRE_NODE_ANNOUNCEMENT) { err = handle_gossip_msg(peer->daemon, dc->msg_in, "subdaemon"); if (err) queue_peer_msg(peer, take(err)); } else if (type == WIRE_QUERY_SHORT_CHANNEL_IDS) { handle_query_short_channel_ids(peer, dc->msg_in); } else if (type == WIRE_REPLY_SHORT_CHANNEL_IDS_END) { handle_reply_short_channel_ids_end(peer, dc->msg_in); } else if (type == WIRE_GOSSIP_TIMESTAMP_FILTER) { handle_gossip_timestamp_filter(peer, dc->msg_in); } else if (type == WIRE_GOSSIP_GET_UPDATE) { handle_get_update(peer, dc->msg_in); } else if (type == WIRE_GOSSIP_LOCAL_ADD_CHANNEL) { gossip_store_add(peer->daemon->rstate->store, dc->msg_in); handle_local_add_channel(peer->daemon->rstate, dc->msg_in); } else if (type == WIRE_GOSSIP_LOCAL_CHANNEL_UPDATE) { handle_local_channel_update(peer, dc->msg_in); } else if (type == WIRE_QUERY_CHANNEL_RANGE) { handle_query_channel_range(peer, dc->msg_in); } else if (type == WIRE_REPLY_CHANNEL_RANGE) { handle_reply_channel_range(peer, dc->msg_in); } else if (type == WIRE_PING) { handle_ping(peer, dc->msg_in); } else if (type == WIRE_PONG) { handle_pong(peer, dc->msg_in); } else { status_broken("peer %s: send us unknown msg of type %s", type_to_string(tmpctx, struct pubkey, &peer->id), gossip_wire_type_name(type)); return io_close(conn); } return daemon_conn_read_next(conn, dc); } static void free_peer(struct io_conn *conn, struct daemon_conn *dc) { struct peer *peer = dc->ctx; tal_free(peer); } static struct io_plan *connectd_new_peer(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct peer *peer = tal(conn, struct peer); int fds[2]; if (!fromwire_gossip_new_peer(msg, &peer->id, &peer->gossip_queries_feature, &peer->initial_routing_sync_feature)) { status_broken("Bad new_peer msg from connectd: %s", tal_hex(tmpctx, msg)); return io_close(conn); } if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) != 0) { status_broken("Failed to create socketpair: %s", strerror(errno)); daemon_conn_send(&daemon->connectd, take(towire_gossip_new_peer_reply(NULL, false))); goto done; } /* We might not have noticed old peer is dead; kill it now. */ tal_free(find_peer(daemon, &peer->id)); peer->daemon = daemon; peer->remote = tal(peer, struct daemon_conn); daemon_conn_init(peer, peer->remote, fds[0], owner_msg_in, free_peer); peer->remote->msg_queue_cleared_cb = nonlocal_dump_gossip; peer->scid_queries = NULL; peer->scid_query_idx = 0; peer->scid_query_nodes = NULL; peer->scid_query_nodes_idx = 0; peer->num_scid_queries_outstanding = 0; peer->query_channel_blocks = NULL; peer->num_pings_outstanding = 0; peer->gossip_timer = NULL; list_add_tail(&peer->daemon->peers, &peer->list); tal_add_destructor(peer, destroy_peer); /* BOLT #7: * * - if the `gossip_queries` feature is negotiated: * - MUST NOT relay any gossip messages unless explicitly requested. */ if (peer->gossip_queries_feature) { peer->broadcast_index = UINT64_MAX; /* Nothing in this range */ peer->gossip_timestamp_min = UINT32_MAX; peer->gossip_timestamp_max = 0; } else { /* BOLT #7: * * - upon receiving an `init` message with the * `initial_routing_sync` flag set to 1: * - SHOULD send gossip messages for all known channels and * nodes, as if they were just received. * - if the `initial_routing_sync` flag is set to 0, OR if the * initial sync was completed: * - SHOULD resume normal operation, as specified in the * following [Rebroadcasting](#rebroadcasting) section. */ peer->gossip_timestamp_min = 0; peer->gossip_timestamp_max = UINT32_MAX; if (peer->initial_routing_sync_feature) peer->broadcast_index = 0; else peer->broadcast_index = peer->daemon->rstate->broadcasts->next_index; } /* Start the gossip flowing. */ wake_gossip_out(peer); setup_gossip_range(peer); /* Reply with success, and the new fd */ daemon_conn_send(&daemon->connectd, take(towire_gossip_new_peer_reply(NULL, true))); daemon_conn_send_fd(&daemon->connectd, fds[1]); done: return daemon_conn_read_next(conn, &daemon->connectd); } /** * nonlocal_dump_gossip - catch the nonlocal peer up with the latest gossip. * * Registered as `msg_queue_cleared_cb` by the `peer->remote`. */ static bool nonlocal_dump_gossip(struct io_conn *conn, struct daemon_conn *dc) { struct peer *peer = dc->ctx; /* Do we have scid query replies to send? */ if (create_next_scid_reply(peer)) return true; /* Otherwise queue any gossip we want to send */ return maybe_queue_gossip(peer); } static struct io_plan *getroute_req(struct io_conn *conn, struct daemon *daemon, u8 *msg) { struct pubkey source, destination; u64 msatoshi; u32 final_cltv; u16 riskfactor; u8 *out; struct route_hop *hops; double fuzz; struct siphash_seed seed; fromwire_gossip_getroute_request(msg, &source, &destination, &msatoshi, &riskfactor, &final_cltv, &fuzz, &seed); status_trace("Trying to find a route from %s to %s for %"PRIu64" msatoshi", pubkey_to_hexstr(tmpctx, &source), pubkey_to_hexstr(tmpctx, &destination), msatoshi); hops = get_route(tmpctx, daemon->rstate, &source, &destination, msatoshi, 1, final_cltv, fuzz, &seed); out = towire_gossip_getroute_reply(msg, hops); daemon_conn_send(&daemon->master, out); return daemon_conn_read_next(conn, &daemon->master); } static void append_half_channel(struct gossip_getchannels_entry **entries, const struct chan *chan, int idx) { const struct half_chan *c = &chan->half[idx]; struct gossip_getchannels_entry *e; size_t n; if (!is_halfchan_defined(c)) return; n = tal_count(*entries); tal_resize(entries, n+1); e = &(*entries)[n]; e->source = chan->nodes[idx]->id; e->destination = chan->nodes[!idx]->id; e->satoshis = chan->satoshis; e->flags = c->flags; e->local_disabled = chan->local_disabled; e->public = is_chan_public(chan); e->short_channel_id = chan->scid; e->last_update_timestamp = c->last_timestamp; e->base_fee_msat = c->base_fee; e->fee_per_millionth = c->proportional_fee; e->delay = c->delay; } static void append_channel(struct gossip_getchannels_entry **entries, const struct chan *chan) { append_half_channel(entries, chan, 0); append_half_channel(entries, chan, 1); } static struct io_plan *getchannels_req(struct io_conn *conn, struct daemon *daemon, u8 *msg) { u8 *out; struct gossip_getchannels_entry *entries; struct chan *chan; struct short_channel_id *scid; fromwire_gossip_getchannels_request(msg, msg, &scid); entries = tal_arr(tmpctx, struct gossip_getchannels_entry, 0); if (scid) { chan = get_channel(daemon->rstate, scid); if (chan) append_channel(&entries, chan); } else { u64 idx; for (chan = uintmap_first(&daemon->rstate->chanmap, &idx); chan; chan = uintmap_after(&daemon->rstate->chanmap, &idx)) { append_channel(&entries, chan); } } out = towire_gossip_getchannels_reply(NULL, entries); daemon_conn_send(&daemon->master, take(out)); return daemon_conn_read_next(conn, &daemon->master); } static void append_node(const struct gossip_getnodes_entry ***nodes, const struct pubkey *nodeid, const u8 *gfeatures, /* If non-NULL, contains more information */ const struct node *n) { struct gossip_getnodes_entry *new; size_t num_nodes = tal_count(*nodes); new = tal(*nodes, struct gossip_getnodes_entry); new->nodeid = *nodeid; new->global_features = tal_dup_arr(*nodes, u8, gfeatures, tal_count(gfeatures), 0); if (!n || n->last_timestamp < 0) { new->last_timestamp = -1; new->addresses = NULL; } else { new->last_timestamp = n->last_timestamp; new->addresses = n->addresses; new->alias = n->alias; memcpy(new->color, n->rgb_color, 3); } tal_resize(nodes, num_nodes + 1); (*nodes)[num_nodes] = new; } static struct io_plan *getnodes(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { u8 *out; struct node *n; const struct gossip_getnodes_entry **nodes; struct pubkey *id; fromwire_gossip_getnodes_request(tmpctx, msg, &id); nodes = tal_arr(tmpctx, const struct gossip_getnodes_entry *, 0); if (id) { n = get_node(daemon->rstate, id); if (n) append_node(&nodes, id, n->gfeatures, n); } else { struct node_map_iter i; n = node_map_first(daemon->rstate->nodes, &i); while (n != NULL) { append_node(&nodes, &n->id, n->gfeatures, n); n = node_map_next(daemon->rstate->nodes, &i); } } out = towire_gossip_getnodes_reply(NULL, nodes); daemon_conn_send(&daemon->master, take(out)); return daemon_conn_read_next(conn, &daemon->master); } #if DEVELOPER static struct io_plan *ping_req(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; u16 num_pong_bytes, len; struct peer *peer; u8 *ping; if (!fromwire_gossip_ping(msg, &id, &num_pong_bytes, &len)) master_badmsg(WIRE_GOSSIP_PING, msg); peer = find_peer(daemon, &id); if (!peer) { daemon_conn_send(&daemon->master, take(towire_gossip_ping_reply(NULL, false, 0))); goto out; } ping = make_ping(peer, num_pong_bytes, len); if (tal_count(ping) > 65535) status_failed(STATUS_FAIL_MASTER_IO, "Oversize ping"); queue_peer_msg(peer, take(ping)); status_trace("sending ping expecting %sresponse", num_pong_bytes >= 65532 ? "no " : ""); /* BOLT #1: * * A node receiving a `ping` message: *... * - if `num_pong_bytes` is less than 65532: * - MUST respond by sending a `pong` message, with `byteslen` equal * to `num_pong_bytes`. * - otherwise (`num_pong_bytes` is **not** less than 65532): * - MUST ignore the `ping`. */ if (num_pong_bytes >= 65532) daemon_conn_send(&daemon->master, take(towire_gossip_ping_reply(NULL, true, 0))); else peer->num_pings_outstanding++; out: return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *query_scids_req(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; struct short_channel_id *scids; struct peer *peer; u8 *encoded; /* BOLT #7: * * 1. type: 261 (`query_short_channel_ids`) (`gossip_queries`) * 2. data: * * [`32`:`chain_hash`] * * [`2`:`len`] * * [`len`:`encoded_short_ids`] */ const size_t reply_overhead = 32 + 2; const size_t max_encoded_bytes = 65535 - 2 - reply_overhead; if (!fromwire_gossip_query_scids(msg, msg, &id, &scids)) master_badmsg(WIRE_GOSSIP_QUERY_SCIDS, msg); peer = find_peer(daemon, &id); if (!peer) { status_broken("query_scids: unknown peer %s", type_to_string(tmpctx, struct pubkey, &id)); goto fail; } if (!peer->gossip_queries_feature) { status_broken("query_scids: no gossip_query support in peer %s", type_to_string(tmpctx, struct pubkey, &id)); goto fail; } encoded = encode_short_channel_ids_start(tmpctx); for (size_t i = 0; i < tal_count(scids); i++) encode_add_short_channel_id(&encoded, &scids[i]); if (!encode_short_channel_ids_end(&encoded, max_encoded_bytes)) { status_broken("query_short_channel_ids: %zu is too many", tal_count(scids)); goto fail; } msg = towire_query_short_channel_ids(NULL, &daemon->rstate->chain_hash, encoded); queue_peer_msg(peer, take(msg)); peer->num_scid_queries_outstanding++; status_trace("sending query for %zu scids", tal_count(scids)); out: return daemon_conn_read_next(conn, &daemon->master); fail: daemon_conn_send(&daemon->master, take(towire_gossip_scids_reply(NULL, false, false))); goto out; } static struct io_plan *send_timestamp_filter(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; u32 first, range; struct peer *peer; if (!fromwire_gossip_send_timestamp_filter(msg, &id, &first, &range)) master_badmsg(WIRE_GOSSIP_SEND_TIMESTAMP_FILTER, msg); peer = find_peer(daemon, &id); if (!peer) { status_broken("send_timestamp_filter: unknown peer %s", type_to_string(tmpctx, struct pubkey, &id)); goto out; } if (!peer->gossip_queries_feature) { status_broken("send_timestamp_filter: no gossip_query support in peer %s", type_to_string(tmpctx, struct pubkey, &id)); goto out; } msg = towire_gossip_timestamp_filter(NULL, &daemon->rstate->chain_hash, first, range); queue_peer_msg(peer, take(msg)); out: return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *query_channel_range(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; u32 first_blocknum, number_of_blocks; struct peer *peer; if (!fromwire_gossip_query_channel_range(msg, &id, &first_blocknum, &number_of_blocks)) master_badmsg(WIRE_GOSSIP_QUERY_SCIDS, msg); peer = find_peer(daemon, &id); if (!peer) { status_broken("query_channel_range: unknown peer %s", type_to_string(tmpctx, struct pubkey, &id)); goto fail; } if (!peer->gossip_queries_feature) { status_broken("query_channel_range: no gossip_query support in peer %s", type_to_string(tmpctx, struct pubkey, &id)); goto fail; } if (peer->query_channel_blocks) { status_broken("query_channel_range: previous query active"); goto fail; } status_debug("sending query_channel_range for blocks %u+%u", first_blocknum, number_of_blocks); msg = towire_query_channel_range(NULL, &daemon->rstate->chain_hash, first_blocknum, number_of_blocks); queue_peer_msg(peer, take(msg)); peer->first_channel_range = first_blocknum; /* This uses 8 times as much as it needs to, but it's only for dev */ peer->query_channel_blocks = tal_arrz(peer, u8, number_of_blocks); peer->query_channel_scids = tal_arr(peer, struct short_channel_id, 0); out: return daemon_conn_read_next(conn, &daemon->master); fail: daemon_conn_send(&daemon->master, take(towire_gossip_query_channel_range_reply(NULL, 0, 0, false, NULL))); goto out; } static struct io_plan *dev_set_max_scids_encode_size(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { if (!fromwire_gossip_dev_set_max_scids_encode_size(msg, &max_scids_encode_bytes)) master_badmsg(WIRE_GOSSIP_DEV_SET_MAX_SCIDS_ENCODE_SIZE, msg); status_trace("Set max_scids_encode_bytes to %u", max_scids_encode_bytes); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *dev_gossip_suppress(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { if (!fromwire_gossip_dev_suppress(msg)) master_badmsg(WIRE_GOSSIP_DEV_SUPPRESS, msg); status_unusual("Suppressing all gossip"); suppress_gossip = true; return daemon_conn_read_next(conn, &daemon->master); } #endif /* DEVELOPER */ static void gossip_send_keepalive_update(struct routing_state *rstate, const struct chan *chan, const struct half_chan *hc) { u8 *update, *err; /* Generate a new update, with up to date timestamp */ update = create_channel_update(tmpctx, rstate, chan, hc->flags & ROUTING_FLAGS_DIRECTION, false, hc->delay, hc->htlc_minimum_msat, hc->base_fee, hc->proportional_fee); status_trace("Sending keepalive channel_update for %s", type_to_string(tmpctx, struct short_channel_id, &chan->scid)); err = handle_channel_update(rstate, update, "keepalive"); if (err) status_failed(STATUS_FAIL_INTERNAL_ERROR, "rejected keepalive channel_update: %s", tal_hex(tmpctx, err)); } static void gossip_refresh_network(struct daemon *daemon) { u64 now = time_now().ts.tv_sec; /* Anything below this highwater mark could be pruned if not refreshed */ s64 highwater = now - daemon->rstate->prune_timeout / 2; struct node *n; /* Schedule next run now */ new_reltimer(&daemon->timers, daemon, time_from_sec(daemon->rstate->prune_timeout/4), gossip_refresh_network, daemon); /* Find myself in the network */ n = get_node(daemon->rstate, &daemon->id); if (n) { /* Iterate through all outgoing connection and check whether * it's time to re-announce */ for (size_t i = 0; i < tal_count(n->chans); i++) { struct half_chan *hc = half_chan_from(n, n->chans[i]); if (!is_halfchan_defined(hc)) { /* Connection is not announced yet, so don't even * try to re-announce it */ continue; } if (hc->last_timestamp > highwater) { /* No need to send a keepalive update message */ continue; } if (!is_halfchan_enabled(hc)) { /* Only send keepalives for active connections */ continue; } gossip_send_keepalive_update(daemon->rstate, n->chans[i], hc); } } route_prune(daemon->rstate); } static void gossip_disable_outgoing_halfchan(struct daemon *daemon, struct chan *chan) { u8 direction; struct half_chan *hc; u16 flags; u32 timestamp; struct bitcoin_blkid chain_hash; secp256k1_ecdsa_signature sig; struct local_update *local_update; struct routing_state *rstate = daemon->rstate; direction = pubkey_eq(&chan->nodes[0]->id, &rstate->local_id)?0:1; assert(chan); hc = &chan->half[direction]; if (!is_halfchan_defined(hc)) return; status_trace("Disabling channel %s/%d, active %d -> %d", type_to_string(tmpctx, struct short_channel_id, &chan->scid), direction, is_halfchan_enabled(hc), 0); local_update = tal(daemon, struct local_update); local_update->daemon = daemon; local_update->direction = direction; if (!fromwire_channel_update( hc->channel_update, &sig, &chain_hash, &local_update->scid, ×tamp, &flags, &local_update->cltv_delta, &local_update->htlc_minimum_msat, &local_update->fee_base_msat, &local_update->fee_proportional_millionths)) { status_failed( STATUS_FAIL_INTERNAL_ERROR, "Unable to parse previously accepted channel_update"); } local_update->disable = true; queue_local_update(daemon, local_update); } /** * Disable both directions of a local channel. * * Disables both directions of a local channel as a result of a close or lost * connection. A disabling `channel_update` will be queued for the outgoing * direction as well, but that will be a little delayed. We can't do that for * the incoming direction, so we set local_disabled and the other endpoint * should take care of publicly disabling it with a `channel_update`. * * It is important to disable the incoming edge as well since we might otherwise * return that edge as a `contact_point` as part of an invoice. */ static void gossip_disable_local_channel(struct daemon *daemon, struct chan *chan) { struct routing_state *rstate = daemon->rstate; assert(pubkey_eq(&rstate->local_id, &chan->nodes[0]->id) || pubkey_eq(&rstate->local_id, &chan->nodes[1]->id)); chan->local_disabled = true; gossip_disable_outgoing_halfchan(daemon, chan); } static void gossip_disable_local_channels(struct daemon *daemon) { struct node *local_node = get_node(daemon->rstate, &daemon->rstate->local_id); size_t i; /* We don't have a local_node, so we don't have any channels yet * either */ if (!local_node) return; for (i = 0; i < tal_count(local_node->chans); i++) gossip_disable_local_channel(daemon, local_node->chans[i]); } /* Parse an incoming gossip init message and assign config variables * to the daemon. */ static struct io_plan *gossip_init(struct daemon_conn *master, struct daemon *daemon, const u8 *msg) { struct bitcoin_blkid chain_hash; u32 update_channel_interval; if (!fromwire_gossipctl_init( daemon, msg, &daemon->broadcast_interval, &chain_hash, &daemon->id, &daemon->globalfeatures, daemon->rgb, daemon->alias, &update_channel_interval, &daemon->announcable)) { master_badmsg(WIRE_GOSSIPCTL_INIT, msg); } /* Prune time is twice update time */ daemon->rstate = new_routing_state(daemon, &chain_hash, &daemon->id, update_channel_interval * 2); /* Load stored gossip messages */ gossip_store_load(daemon->rstate, daemon->rstate->store); /* Now disable all local channels, they can't be connected yet. */ gossip_disable_local_channels(daemon); new_reltimer(&daemon->timers, daemon, time_from_sec(daemon->rstate->prune_timeout/4), gossip_refresh_network, daemon); return daemon_conn_read_next(master->conn, master); } static struct io_plan *resolve_channel_req(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct short_channel_id scid; struct chan *chan; struct pubkey *keys; if (!fromwire_gossip_resolve_channel_request(msg, &scid)) master_badmsg(WIRE_GOSSIP_RESOLVE_CHANNEL_REQUEST, msg); chan = get_channel(daemon->rstate, &scid); if (!chan) { status_trace("Failed to resolve channel %s", type_to_string(tmpctx, struct short_channel_id, &scid)); keys = NULL; } else { keys = tal_arr(msg, struct pubkey, 2); keys[0] = chan->nodes[0]->id; keys[1] = chan->nodes[1]->id; status_trace("Resolved channel %s %s<->%s", type_to_string(tmpctx, struct short_channel_id, &scid), type_to_string(tmpctx, struct pubkey, &keys[0]), type_to_string(tmpctx, struct pubkey, &keys[1])); } daemon_conn_send(&daemon->master, take(towire_gossip_resolve_channel_reply(NULL, keys))); return daemon_conn_read_next(conn, &daemon->master); } static void peer_disable_channels(struct daemon *daemon, struct node *node) { struct chan *c; size_t i; for (i=0; ichans); i++) { c = node->chans[i]; if (pubkey_eq(&other_node(node, c)->id, &daemon->rstate->local_id)) gossip_disable_local_channel(daemon, c); } } static struct io_plan *handle_txout_reply(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct short_channel_id scid; u8 *outscript; u64 satoshis; if (!fromwire_gossip_get_txout_reply(msg, msg, &scid, &satoshis, &outscript)) master_badmsg(WIRE_GOSSIP_GET_TXOUT_REPLY, msg); handle_pending_cannouncement(daemon->rstate, &scid, satoshis, outscript); maybe_send_own_node_announce(daemon); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *handle_routing_failure(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey erring_node; struct short_channel_id erring_channel; u16 failcode; u8 *channel_update; if (!fromwire_gossip_routing_failure(msg, msg, &erring_node, &erring_channel, &failcode, &channel_update)) master_badmsg(WIRE_GOSSIP_ROUTING_FAILURE, msg); routing_failure(daemon->rstate, &erring_node, &erring_channel, (enum onion_type) failcode, channel_update); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan * handle_mark_channel_unroutable(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct short_channel_id channel; if (!fromwire_gossip_mark_channel_unroutable(msg, &channel)) master_badmsg(WIRE_GOSSIP_MARK_CHANNEL_UNROUTABLE, msg); mark_channel_unroutable(daemon->rstate, &channel); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *handle_outpoint_spent(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct short_channel_id scid; struct chan *chan; struct routing_state *rstate = daemon->rstate; if (!fromwire_gossip_outpoint_spent(msg, &scid)) master_badmsg(WIRE_GOSSIP_ROUTING_FAILURE, msg); chan = get_channel(rstate, &scid); if (chan) { status_trace( "Deleting channel %s due to the funding outpoint being " "spent", type_to_string(msg, struct short_channel_id, &scid)); /* Freeing is sufficient since everything else is allocated off * of the channel and the destructor takes care of unregistering * the channel */ tal_free(chan); gossip_store_add_channel_delete(rstate->store, &scid); } return daemon_conn_read_next(conn, &daemon->master); } /** * Disable both directions of a channel due to an imminent close. * * We'll leave it to handle_outpoint_spent to delete the channel from our view * once the close gets confirmed. This avoids having strange states in which the * channel is list in our peer list but won't be returned when listing public * channels. This does not send out updates since that's triggered by the peer * connection closing. */ static struct io_plan *handle_local_channel_close(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct short_channel_id scid; struct chan *chan; struct routing_state *rstate = daemon->rstate; if (!fromwire_gossip_local_channel_close(msg, &scid)) master_badmsg(WIRE_GOSSIP_ROUTING_FAILURE, msg); chan = get_channel(rstate, &scid); if (chan) gossip_disable_local_channel(daemon, chan); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *recv_req(struct io_conn *conn, struct daemon_conn *master) { struct daemon *daemon = container_of(master, struct daemon, master); enum gossip_wire_type t = fromwire_peektype(master->msg_in); switch (t) { case WIRE_GOSSIPCTL_INIT: return gossip_init(master, daemon, master->msg_in); case WIRE_GOSSIP_GETNODES_REQUEST: return getnodes(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_GETROUTE_REQUEST: return getroute_req(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_GETCHANNELS_REQUEST: return getchannels_req(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_RESOLVE_CHANNEL_REQUEST: return resolve_channel_req(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_GET_TXOUT_REPLY: return handle_txout_reply(conn, daemon, master->msg_in); case WIRE_GOSSIP_ROUTING_FAILURE: return handle_routing_failure(conn, daemon, master->msg_in); case WIRE_GOSSIP_MARK_CHANNEL_UNROUTABLE: return handle_mark_channel_unroutable(conn, daemon, master->msg_in); case WIRE_GOSSIP_OUTPOINT_SPENT: return handle_outpoint_spent(conn, daemon, master->msg_in); case WIRE_GOSSIP_LOCAL_CHANNEL_CLOSE: return handle_local_channel_close(conn, daemon, master->msg_in); #if DEVELOPER case WIRE_GOSSIP_PING: return ping_req(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_QUERY_SCIDS: return query_scids_req(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_SEND_TIMESTAMP_FILTER: return send_timestamp_filter(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_QUERY_CHANNEL_RANGE: return query_channel_range(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_DEV_SET_MAX_SCIDS_ENCODE_SIZE: return dev_set_max_scids_encode_size(conn, daemon, daemon->master.msg_in); case WIRE_GOSSIP_DEV_SUPPRESS: return dev_gossip_suppress(conn, daemon, daemon->master.msg_in); #else case WIRE_GOSSIP_PING: case WIRE_GOSSIP_QUERY_SCIDS: case WIRE_GOSSIP_SEND_TIMESTAMP_FILTER: case WIRE_GOSSIP_QUERY_CHANNEL_RANGE: case WIRE_GOSSIP_DEV_SET_MAX_SCIDS_ENCODE_SIZE: case WIRE_GOSSIP_DEV_SUPPRESS: break; #endif /* !DEVELOPER */ /* We send these, we don't receive them */ case WIRE_GOSSIP_GETNODES_REPLY: case WIRE_GOSSIP_GETROUTE_REPLY: case WIRE_GOSSIP_GETCHANNELS_REPLY: case WIRE_GOSSIP_PING_REPLY: case WIRE_GOSSIP_SCIDS_REPLY: case WIRE_GOSSIP_QUERY_CHANNEL_RANGE_REPLY: case WIRE_GOSSIP_RESOLVE_CHANNEL_REPLY: case WIRE_GOSSIP_GET_UPDATE: case WIRE_GOSSIP_GET_UPDATE_REPLY: case WIRE_GOSSIP_SEND_GOSSIP: case WIRE_GOSSIP_LOCAL_ADD_CHANNEL: case WIRE_GOSSIP_LOCAL_CHANNEL_UPDATE: case WIRE_GOSSIP_GET_TXOUT: break; } /* Master shouldn't give bad requests. */ status_failed(STATUS_FAIL_MASTER_IO, "%i: %s", t, tal_hex(tmpctx, master->msg_in)); } static struct io_plan *connectd_get_address(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; struct node *node; const struct wireaddr *addrs; if (!fromwire_gossip_get_addrs(msg, &id)) { status_broken("Bad gossip_get_addrs msg from connectd: %s", tal_hex(tmpctx, msg)); return io_close(conn); } node = get_node(daemon->rstate, &id); if (node) addrs = node->addresses; else addrs = NULL; daemon_conn_send(&daemon->connectd, take(towire_gossip_get_addrs_reply(NULL, addrs))); return daemon_conn_read_next(conn, &daemon->connectd); } static struct io_plan *connectd_req(struct io_conn *conn, struct daemon_conn *connectd) { struct daemon *daemon = container_of(connectd, struct daemon, connectd); enum connect_gossip_wire_type t = fromwire_peektype(connectd->msg_in); switch (t) { case WIRE_GOSSIP_NEW_PEER: return connectd_new_peer(conn, daemon, connectd->msg_in); case WIRE_GOSSIP_GET_ADDRS: return connectd_get_address(conn, daemon, connectd->msg_in); /* We send these, don't receive them. */ case WIRE_GOSSIP_NEW_PEER_REPLY: case WIRE_GOSSIP_GET_ADDRS_REPLY: break; } status_broken("Bad msg from connectd: %s", tal_hex(tmpctx, connectd->msg_in)); return io_close(conn); } #ifndef TESTING static void master_gone(struct io_conn *unused UNUSED, struct daemon_conn *dc UNUSED) { /* Can't tell master, it's gone. */ exit(2); } int main(int argc, char *argv[]) { setup_locale(); struct daemon *daemon; subdaemon_setup(argc, argv); daemon = tal(NULL, struct daemon); list_head_init(&daemon->peers); list_head_init(&daemon->local_updates); timers_init(&daemon->timers, time_mono()); daemon->broadcast_interval = 30000; daemon->last_announce_timestamp = 0; /* stdin == control */ daemon_conn_init(daemon, &daemon->master, STDIN_FILENO, recv_req, master_gone); status_setup_async(&daemon->master); hsm_setup(HSM_FD); daemon_conn_init(daemon, &daemon->connectd, CONNECTD_FD, connectd_req, NULL); /* When conn closes, everything is freed. */ tal_steal(daemon->master.conn, daemon); for (;;) { struct timer *expired = NULL; io_loop(&daemon->timers, &expired); if (!expired) { break; } else { timer_expired(daemon, expired); } } daemon_shutdown(); return 0; } #endif