#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 struct daemon { /* Who am I? */ struct pubkey id; /* Peers we have directly or indirectly */ struct list_head peers; /* Peers we are trying to reach */ struct list_head reaching; /* Connection to main daemon. */ struct daemon_conn master; /* Routing information */ struct routing_state *rstate; /* Hacky list of known address hints. */ struct list_head addrhints; struct timers timers; u32 broadcast_interval; /* Local and global features to offer to peers. */ u8 *localfeatures, *globalfeatures; u8 alias[33]; u8 rgb[3]; struct wireaddr *wireaddrs; /* To make sure our node_announcement timestamps increase */ u32 last_announce_timestamp; }; /* Peers we're trying to reach. */ struct reaching { struct daemon *daemon; /* daemon->reaching */ struct list_node list; /* The ID of the peer (not necessarily unique, in transit!) */ struct pubkey id; /* Where I'm reaching to. */ struct wireaddr addr; /* Did we succeed? */ bool succeeded; /* How many times have we attempted to connect? */ u32 attempts; /* How many times to attempt */ u32 max_attempts; /* Timestamp of the first attempt */ u32 first_attempt; }; /* Things we need when we're talking direct to the peer. */ struct local_peer_state { /* Cryptostate */ struct peer_crypto_state pcs; /* File descriptor corresponding to conn. */ int fd; /* Our connection (and owner) */ struct io_conn *conn; /* Waiting to send_peer_with_fds to master? */ bool return_to_master; /* If we're exiting due to non-gossip msg, otherwise release */ u8 *nongossip_msg; /* How many pongs are we expecting? */ size_t num_pings_outstanding; /* Message queue for outgoing. */ struct msg_queue peer_out; }; struct peer { struct daemon *daemon; /* daemon->peers */ struct list_node list; /* The ID of the peer (not necessarily unique, in transit!) */ struct pubkey id; /* Where it's connected to. */ struct wireaddr addr; /* Feature bitmaps. */ u8 *gfeatures, *lfeatures; /* High water mark for the staggered broadcast */ u64 broadcast_index; /* Is it time to continue the staggered broadcast? */ bool gossip_sync; /* If we die, should we reach again? */ bool reach_again; /* Only one of these is set: */ struct local_peer_state *local; struct daemon_conn *remote; }; struct addrhint { /* Off ld->addrhints */ struct list_node list; struct pubkey id; /* FIXME: use array... */ struct wireaddr addr; }; /* FIXME: Reorder */ static struct io_plan *peer_start_gossip(struct io_conn *conn, struct peer *peer); static bool send_peer_with_fds(struct peer *peer, const u8 *msg); static void wake_pkt_out(struct peer *peer); static bool try_reach_peer(struct daemon *daemon, const struct pubkey *id); static void destroy_peer(struct peer *peer) { list_del_from(&peer->daemon->peers, &peer->list); if (peer->reach_again) try_reach_peer(peer->daemon, &peer->id); } 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 void destroy_addrhint(struct addrhint *a) { list_del(&a->list); } static struct addrhint *find_addrhint(struct daemon *daemon, const struct pubkey *id) { struct addrhint *a; list_for_each(&daemon->addrhints, a, list) { if (pubkey_eq(&a->id, id)) return a; } return NULL; } static struct local_peer_state * new_local_peer_state(struct peer *peer, const struct crypto_state *cs) { struct local_peer_state *lps = tal(peer, struct local_peer_state); init_peer_crypto_state(peer, &lps->pcs); lps->pcs.cs = *cs; lps->return_to_master = false; lps->num_pings_outstanding = 0; msg_queue_init(&lps->peer_out, peer); return lps; } static struct peer *new_peer(const tal_t *ctx, struct daemon *daemon, const struct pubkey *their_id, const struct wireaddr *addr, const struct crypto_state *cs) { struct peer *peer = tal(ctx, struct peer); peer->id = *their_id; peer->addr = *addr; peer->daemon = daemon; peer->local = new_local_peer_state(peer, cs); peer->remote = NULL; peer->reach_again = false; peer->broadcast_index = 0; return peer; } static void peer_finalized(struct peer *peer) { /* No longer tied to peer->conn's lifetime. */ tal_steal(peer->daemon, peer); /* Now we can put this in the list of peers */ list_add_tail(&peer->daemon->peers, &peer->list); tal_add_destructor(peer, destroy_peer); } static void destroy_reaching(struct reaching *reach) { list_del_from(&reach->daemon->reaching, &reach->list); } static struct reaching *find_reaching(struct daemon *daemon, const struct pubkey *id) { struct reaching *r; list_for_each(&daemon->reaching, r, list) if (pubkey_eq(id, &r->id)) return r; return NULL; } static void reached_peer(struct daemon *daemon, const struct pubkey *id, struct io_conn *conn) { struct reaching *r = find_reaching(daemon, id); if (!r) return; /* OK, we've reached the peer successfully, stop retrying. */ /* Don't free conn with reach. */ tal_steal(daemon, conn); /* Don't call connect_failed */ io_set_finish(conn, NULL, NULL); tal_free(r); } static void queue_peer_msg(struct peer *peer, const u8 *msg TAKES) { if (peer->local) { msg_enqueue(&peer->local->peer_out, msg); } else { /* Use gossip_index 0 meaning don't update index */ const u8 *send = towire_gossip_send_gossip(NULL, 0, msg); if (taken(msg)) tal_free(msg); daemon_conn_send(peer->remote, take(send)); } } 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(trc, struct pubkey, &peer->id), tal_vfmt(trc, 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 bool is_all_channel_error(const u8 *msg) { struct channel_id channel_id; u8 *data; if (!fromwire_error(msg, msg, &channel_id, &data)) return false; tal_free(data); return channel_id_is_all(&channel_id); } static struct io_plan *peer_close_after_error(struct io_conn *conn, struct peer *peer) { status_trace("%s: we sent them a fatal error, closing", type_to_string(trc, struct pubkey, &peer->id)); return io_close(conn); } static struct io_plan *peer_init_received(struct io_conn *conn, struct peer *peer, u8 *msg) { if (!fromwire_init(peer, msg, &peer->gfeatures, &peer->lfeatures)){ status_trace("peer %s bad fromwire_init '%s', closing", type_to_string(trc, struct pubkey, &peer->id), tal_hex(trc, msg)); return io_close(conn); } reached_peer(peer->daemon, &peer->id, conn); /* This is a full peer now; we keep it around until its * gossipfd closed (forget_peer) or reconnect. */ peer_finalized(peer); /* We will not have anything queued, since we're not duplex. */ msg = towire_gossip_peer_connected(peer, &peer->id, &peer->addr, &peer->local->pcs.cs, peer->broadcast_index, peer->gfeatures, peer->lfeatures); if (!send_peer_with_fds(peer, msg)) return io_close(conn); /* Start the gossip flowing. */ /* FIXME: This is a bit wasteful in the common case where master * simply hands it straight back to us and we restart the peer and * restart gossip broadcast... */ wake_pkt_out(peer); return io_close_taken_fd(conn); } static struct io_plan *read_init(struct io_conn *conn, struct peer *peer) { /* BOLT #1: * * Each node MUST wait to receive `init` before sending any other * messages. */ return peer_read_message(conn, &peer->local->pcs, peer_init_received); } /* This creates a temporary peer which is not in the list and is owner * by the connection; it's placed in the list and owned by daemon once * we have the features. */ static struct io_plan *init_new_peer(struct io_conn *conn, const struct pubkey *their_id, const struct wireaddr *addr, const struct crypto_state *cs, struct daemon *daemon) { struct peer *peer = new_peer(conn, daemon, their_id, addr, cs); u8 *initmsg; peer->local->fd = io_conn_fd(conn); /* BOLT #1: * * Each node MUST send `init` as the first lightning message for any * connection. */ initmsg = towire_init(peer, daemon->globalfeatures, daemon->localfeatures); return peer_write_message(conn, &peer->local->pcs, take(initmsg), read_init); } static struct io_plan *owner_msg_in(struct io_conn *conn, struct daemon_conn *dc); static struct io_plan *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 *features = NULL; 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->wireaddrs); i++) towire_wireaddr(&addresses, daemon->wireaddrs+i); announcement = towire_node_announcement(ctx, sig, features, timestamp, &daemon->id, daemon->rgb, daemon->alias, addresses); return announcement; } static void send_node_announcement(struct daemon *daemon) { tal_t *tmpctx = tal_tmpctx(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(tmpctx, 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(tmpctx, 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(trc, err)); tal_free(tmpctx); } /* Returns error if we should send an error. */ static void handle_gossip_msg(struct peer *peer, u8 *msg) { struct routing_state *rstate = peer->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) queue_peer_msg(peer, take(err)); else if (scid) daemon_conn_send(&peer->daemon->master, take(towire_gossip_get_txout(NULL, scid))); break; } case WIRE_NODE_ANNOUNCEMENT: err = handle_node_announcement(rstate, msg); if (err) queue_peer_msg(peer, take(err)); break; case WIRE_CHANNEL_UPDATE: err = handle_channel_update(rstate, msg); if (err) queue_peer_msg(peer, take(err)); break; } } static void handle_ping(struct peer *peer, u8 *ping) { u8 *pong; if (!check_ping_make_pong(peer, ping, &pong)) { peer_error(peer, "Bad ping"); return; } if (pong) msg_enqueue(&peer->local->peer_out, take(pong)); } static void handle_pong(struct peer *peer, const u8 *pong) { const char *err = got_pong(pong, &peer->local->num_pings_outstanding); if (err) { peer_error(peer, "%s", err); return; } daemon_conn_send(&peer->daemon->master, take(towire_gossip_ping_reply(pong, true, tal_len(pong)))); } /* If master asks us to release peer, we attach this destructor in case it * dies while we're waiting for it to finish IO */ static void fail_release(struct peer *peer) { u8 *msg = towire_gossipctl_release_peer_replyfail(peer); daemon_conn_send(&peer->daemon->master, take(msg)); } static struct io_plan *ready_for_master(struct io_conn *conn, struct peer *peer) { u8 *msg; if (peer->local->nongossip_msg) msg = towire_gossip_peer_nongossip(peer, &peer->id, &peer->addr, &peer->local->pcs.cs, peer->broadcast_index, peer->gfeatures, peer->lfeatures, peer->local->nongossip_msg); else msg = towire_gossipctl_release_peer_reply(peer, &peer->addr, &peer->local->pcs.cs, peer->broadcast_index, peer->gfeatures, peer->lfeatures); if (send_peer_with_fds(peer, take(msg))) { /* In case we set this earlier. */ tal_del_destructor(peer, fail_release); return io_close_taken_fd(conn); } else return io_close(conn); } static struct io_plan *peer_msgin(struct io_conn *conn, struct peer *peer, u8 *msg); /* Wrapper around peer_read_message: don't read another if we want to * pass up to master */ static struct io_plan *peer_next_in(struct io_conn *conn, struct peer *peer) { if (peer->local->return_to_master) { assert(!peer_in_started(conn, &peer->local->pcs)); /* Wake writer. */ msg_wake(&peer->local->peer_out); return io_wait(conn, peer, peer_next_in, peer); } return peer_read_message(conn, &peer->local->pcs, peer_msgin); } static struct io_plan *peer_msgin(struct io_conn *conn, struct peer *peer, u8 *msg) { enum wire_type t = fromwire_peektype(msg); switch (t) { case WIRE_ERROR: status_trace("%s sent ERROR %s", type_to_string(trc, struct pubkey, &peer->id), sanitize_error(trc, msg, NULL)); return io_close(conn); case WIRE_CHANNEL_ANNOUNCEMENT: case WIRE_NODE_ANNOUNCEMENT: case WIRE_CHANNEL_UPDATE: handle_gossip_msg(peer, msg); return peer_next_in(conn, peer); case WIRE_PING: handle_ping(peer, msg); return peer_next_in(conn, peer); case WIRE_PONG: handle_pong(peer, msg); return peer_next_in(conn, peer); case WIRE_OPEN_CHANNEL: case WIRE_CHANNEL_REESTABLISH: case WIRE_ACCEPT_CHANNEL: case WIRE_FUNDING_CREATED: case WIRE_FUNDING_SIGNED: case WIRE_FUNDING_LOCKED: case WIRE_ANNOUNCEMENT_SIGNATURES: case WIRE_UPDATE_FEE: case WIRE_SHUTDOWN: case WIRE_CLOSING_SIGNED: case WIRE_UPDATE_ADD_HTLC: case WIRE_UPDATE_FULFILL_HTLC: case WIRE_UPDATE_FAIL_HTLC: case WIRE_UPDATE_FAIL_MALFORMED_HTLC: case WIRE_COMMITMENT_SIGNED: case WIRE_REVOKE_AND_ACK: case WIRE_INIT: /* Not our place to handle this, so we punt */ peer->local->return_to_master = true; peer->local->nongossip_msg = tal_steal(peer, msg); /* This will wait. */ return peer_next_in(conn, peer); } /* BOLT #1: * * The type follows the _it's ok to be odd_ rule, so nodes MAY send * odd-numbered types without ascertaining that the recipient * understands it. */ if (t & 1) { status_trace("Peer %s sent packet with unknown message type %u, ignoring", type_to_string(trc, struct pubkey, &peer->id), t); } else peer_error(peer, "Packet with unknown message type %u", t); return peer_next_in(conn, peer); } /* Wake up the outgoing direction of the connection and write any * queued messages. Needed since the `io_wake` method signature does * not allow us to specify it as the callback for `new_reltimer`, but * it allows us to set an additional flag for the routing dump.. */ static void wake_pkt_out(struct peer *peer) { peer->gossip_sync = true; new_reltimer(&peer->daemon->timers, peer, time_from_msec(peer->daemon->broadcast_interval), wake_pkt_out, peer); if (peer->local) /* Notify the peer-write loop */ msg_wake(&peer->local->peer_out); else /* Notify the daemon_conn-write loop */ msg_wake(&peer->remote->out); } /* Mutual recursion. */ static struct io_plan *peer_pkt_out(struct io_conn *conn, struct peer *peer); static struct io_plan *local_gossip_broadcast_done(struct io_conn *conn, struct peer *peer) { peer->broadcast_index++; return peer_pkt_out(conn, peer); } static struct io_plan *peer_pkt_out(struct io_conn *conn, struct peer *peer) { /* First priority is queued packets, if any */ const u8 *out = msg_dequeue(&peer->local->peer_out); if (out) { if (is_all_channel_error(out)) return peer_write_message(conn, &peer->local->pcs, take(out), peer_close_after_error); return peer_write_message(conn, &peer->local->pcs, take(out), peer_pkt_out); } /* Do we want to send this peer to the master daemon? */ if (peer->local->return_to_master) { if (!peer_in_started(conn, &peer->local->pcs)) return ready_for_master(conn, peer); } else if (peer->gossip_sync) { /* If we're supposed to be sending gossip, do so now. */ struct queued_message *next; next = next_broadcast_message(peer->daemon->rstate->broadcasts, peer->broadcast_index); if (next) return peer_write_message(conn, &peer->local->pcs, next->payload, local_gossip_broadcast_done); /* Gossip is drained. Wait for next timer. */ peer->gossip_sync = false; } return msg_queue_wait(conn, &peer->local->peer_out, peer_pkt_out, peer); } /* Now we're a fully-fledged peer. */ static struct io_plan *peer_start_gossip(struct io_conn *conn, struct peer *peer) { wake_pkt_out(peer); return io_duplex(conn, peer_next_in(conn, peer), peer_pkt_out(conn, peer)); } static void handle_get_update(struct peer *peer, const u8 *msg) { struct short_channel_id scid; struct chan *chan; const u8 *update; if (!fromwire_gossip_get_update(msg, &scid)) { status_trace("peer %s sent bad gossip_get_update %s", type_to_string(trc, struct pubkey, &peer->id), tal_hex(trc, msg)); return; } chan = get_channel(peer->daemon->rstate, &scid); if (!chan) { status_unusual("peer %s scid %s: unknown channel", type_to_string(trc, struct pubkey, &peer->id), type_to_string(trc, struct short_channel_id, &scid)); update = NULL; } else { /* We want 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(trc, struct pubkey, &peer->id), type_to_string(trc, struct short_channel_id, &scid)); update = NULL; } } status_trace("peer %s schanid %s: %s update", type_to_string(trc, struct pubkey, &peer->id), type_to_string(trc, struct short_channel_id, &scid), update ? "got" : "no"); msg = towire_gossip_get_update_reply(msg, update); daemon_conn_send(peer->remote, take(msg)); } static void handle_local_add_channel(struct peer *peer, u8 *msg) { struct routing_state *rstate = peer->daemon->rstate; struct short_channel_id scid; struct bitcoin_blkid chain_hash; struct pubkey remote_node_id; u16 cltv_expiry_delta; u32 fee_base_msat, fee_proportional_millionths; u64 htlc_minimum_msat; int idx; struct chan *chan; if (!fromwire_gossip_local_add_channel( msg, &scid, &chain_hash, &remote_node_id, &cltv_expiry_delta, &htlc_minimum_msat, &fee_base_msat, &fee_proportional_millionths)) { status_broken("Unable to parse local_add_channel message: %s", tal_hex(msg, msg)); return; } if (!structeq(&chain_hash, &rstate->chain_hash)) { status_broken("Received local_add_channel for unknown chain %s", type_to_string(msg, struct bitcoin_blkid, &chain_hash)); return; } if (get_channel(rstate, &scid)) { status_broken("Attempted to local_add_channel a known channel"); return; } /* Create new channel */ chan = new_chan(rstate, &scid, &rstate->local_id, &remote_node_id); idx = pubkey_idx(&rstate->local_id, &remote_node_id), /* Activate the half_chan from us to them. */ set_connection_values(chan, idx, fee_base_msat, fee_proportional_millionths, cltv_expiry_delta, true, 0, htlc_minimum_msat); /* Designed to match msg in handle_channel_update, for easy testing */ status_trace("Received local update for channel %s(%d) now ACTIVE", type_to_string(msg, struct short_channel_id, &scid), idx); } /** * 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; int type = fromwire_peektype(msg); if (type == WIRE_CHANNEL_ANNOUNCEMENT || type == WIRE_CHANNEL_UPDATE || type == WIRE_NODE_ANNOUNCEMENT) { handle_gossip_msg(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) { handle_local_add_channel(peer, dc->msg_in); } else { status_broken("peer %s: send us unknown msg of type %s", type_to_string(trc, struct pubkey, &peer->id), gossip_wire_type_name(type)); /* Calls forget_peer */ return io_close(conn); } return daemon_conn_read_next(conn, dc); } static void forget_peer(struct io_conn *conn UNUSED, struct daemon_conn *dc) { struct peer *peer = dc->ctx; status_trace("Forgetting %s peer %s", peer->local ? "local" : "remote", type_to_string(trc, struct pubkey, &peer->id)); /* Free peer. */ tal_free(dc->ctx); } /* When a peer is to be owned by another daemon, we create a socket * pair to send/receive gossip from it */ static bool send_peer_with_fds(struct peer *peer, const u8 *msg) { int fds[2]; int peer_fd = peer->local->fd; if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) != 0) { status_trace("Failed to create socketpair: %s", strerror(errno)); /* FIXME: Send error to peer? */ /* Peer will be freed when caller closes conn. */ return false; } /* Now we talk to socket to get to peer's owner daemon. */ peer->local = tal_free(peer->local); peer->remote = tal(peer, struct daemon_conn); daemon_conn_init(peer, peer->remote, fds[0], owner_msg_in, forget_peer); peer->remote->msg_queue_cleared_cb = nonlocal_dump_gossip; /* Peer stays around, even though caller will close conn. */ tal_steal(peer->daemon, peer); daemon_conn_send(&peer->daemon->master, msg); daemon_conn_send_fd(&peer->daemon->master, peer_fd); daemon_conn_send_fd(&peer->daemon->master, fds[1]); return true; } static struct io_plan *nonlocal_gossip_broadcast_done(struct io_conn *conn, struct daemon_conn *dc) { struct peer *peer = dc->ctx; peer->broadcast_index++; return nonlocal_dump_gossip(conn, dc); } /** * nonlocal_dump_gossip - catch the nonlocal peer up with the latest gossip. * * Registered as `msg_queue_cleared_cb` by the `peer->remote`. */ static struct io_plan *nonlocal_dump_gossip(struct io_conn *conn, struct daemon_conn *dc) { struct queued_message *next; struct peer *peer = dc->ctx; /* Make sure we are not connected directly */ assert(!peer->local); /* Nothing to do if we're not gossiping */ if (!peer->gossip_sync) return msg_queue_wait(conn, &peer->remote->out, daemon_conn_write_next, dc); next = next_broadcast_message(peer->daemon->rstate->broadcasts, peer->broadcast_index); if (!next) { peer->gossip_sync = false; return msg_queue_wait(conn, &peer->remote->out, daemon_conn_write_next, dc); } else { u8 *msg = towire_gossip_send_gossip(conn, peer->broadcast_index, next->payload); return io_write_wire(conn, take(msg), nonlocal_gossip_broadcast_done, dc); } } static struct io_plan *new_peer_got_fd(struct io_conn *conn, struct peer *peer) { peer->local->conn = io_new_conn(conn, peer->local->fd, peer_start_gossip, peer); if (!peer->local->conn) { status_trace("Could not create connection for peer: %s", strerror(errno)); tal_free(peer); } else { /* If conn dies, we forget peer. */ tal_steal(peer->local->conn, peer); } return daemon_conn_read_next(conn, &peer->daemon->master); } /* This lets us read the fds in before handling anything. */ struct returning_peer { struct daemon *daemon; struct pubkey id; struct crypto_state cs; u64 gossip_index; u8 *inner_msg; int peer_fd, gossip_fd; }; static struct io_plan *handle_returning_peer(struct io_conn *conn, struct returning_peer *rpeer) { struct daemon *daemon = rpeer->daemon; struct peer *peer; peer = find_peer(daemon, &rpeer->id); if (!peer) status_failed(STATUS_FAIL_INTERNAL_ERROR, "hand_back_peer unknown peer: %s", type_to_string(trc, struct pubkey, &rpeer->id)); /* We don't need the gossip_fd; we know what gossip it got * from gossip_index */ close(rpeer->gossip_fd); /* Possible if there's a reconnect: ignore handed back. */ if (peer->local) { status_trace("hand_back_peer %s: reconnected, dropping handback", type_to_string(trc, struct pubkey, &rpeer->id)); close(rpeer->peer_fd); tal_free(rpeer); return daemon_conn_read_next(conn, &daemon->master); } status_trace("hand_back_peer %s: now local again", type_to_string(trc, struct pubkey, &rpeer->id)); /* Now we talk to peer directly again. */ daemon_conn_clear(peer->remote); peer->remote = tal_free(peer->remote); peer->local = new_local_peer_state(peer, &rpeer->cs); peer->local->fd = rpeer->peer_fd; peer->broadcast_index = rpeer->gossip_index; /* If they told us to send a message, queue it now */ if (tal_len(rpeer->inner_msg)) msg_enqueue(&peer->local->peer_out, take(rpeer->inner_msg)); tal_free(rpeer); return new_peer_got_fd(conn, peer); } static struct io_plan *read_returning_gossipfd(struct io_conn *conn, struct returning_peer *rpeer) { return io_recv_fd(conn, &rpeer->gossip_fd, handle_returning_peer, rpeer); } static struct io_plan *hand_back_peer(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct returning_peer *rpeer = tal(daemon, struct returning_peer); rpeer->daemon = daemon; if (!fromwire_gossipctl_hand_back_peer(msg, msg, &rpeer->id, &rpeer->cs, &rpeer->gossip_index, &rpeer->inner_msg)) master_badmsg(WIRE_GOSSIPCTL_HAND_BACK_PEER, msg); return io_recv_fd(conn, &rpeer->peer_fd, read_returning_gossipfd, rpeer); } static struct io_plan *disconnect_peer(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; struct peer *peer; if (!fromwire_gossipctl_peer_disconnect(msg, &id)) master_badmsg(WIRE_GOSSIPCTL_PEER_DISCONNECT, msg); peer = find_peer(daemon, &id); if (peer && peer->local) { /* This peer is local to this (gossipd) dameon */ io_close(peer->local->conn); msg = towire_gossipctl_peer_disconnect_reply(msg); daemon_conn_send(&daemon->master, take(msg)); } else { status_trace("disconnect_peer: peer %s %s", type_to_string(trc, struct pubkey, &id), !peer ? "not connected" : "not gossiping"); msg = towire_gossipctl_peer_disconnect_replyfail(msg, peer ? true : false); daemon_conn_send(&daemon->master, take(msg)); } return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *release_peer(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; struct peer *peer; if (!fromwire_gossipctl_release_peer(msg, &id)) master_badmsg(WIRE_GOSSIPCTL_RELEASE_PEER, msg); peer = find_peer(daemon, &id); if (!peer || !peer->local || peer->local->return_to_master) { /* This can happen with dying peers, or reconnect */ status_trace("release_peer: peer %s %s", type_to_string(trc, struct pubkey, &id), !peer ? "not found" : peer->local ? "already releasing" : "not local"); msg = towire_gossipctl_release_peer_replyfail(msg); daemon_conn_send(&daemon->master, take(msg)); } else { peer->local->return_to_master = true; peer->local->nongossip_msg = NULL; /* Wake output, in case it's idle. */ msg_wake(&peer->local->peer_out); } return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *getroute_req(struct io_conn *conn, struct daemon *daemon, u8 *msg) { tal_t *tmpctx = tal_tmpctx(msg); struct pubkey source, destination; u32 msatoshi, 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 %d 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); tal_free(tmpctx); 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 (!c) return; /* Don't mention non-public inactive channels. */ if (!c->active && !c->channel_update) 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->active = c->active; e->flags = c->flags; e->public = (c->channel_update != NULL); e->short_channel_id = chan->scid; e->last_update_timestamp = c->channel_update ? c->last_timestamp : -1; if (e->last_update_timestamp >= 0) { 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) { tal_t *tmpctx = tal_tmpctx(daemon); 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(daemon, entries); daemon_conn_send(&daemon->master, take(out)); tal_free(tmpctx); return daemon_conn_read_next(conn, &daemon->master); } static void append_node(const struct gossip_getnodes_entry ***nodes, 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 = n->id; new->last_timestamp = n->last_timestamp; if (n->last_timestamp < 0) { new->addresses = NULL; } else { 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) { tal_t *tmpctx = tal_tmpctx(daemon); u8 *out; struct node *n; const struct gossip_getnodes_entry **nodes; struct pubkey *ids; fromwire_gossip_getnodes_request(tmpctx, msg, &ids); nodes = tal_arr(tmpctx, const struct gossip_getnodes_entry *, 0); if (ids) { for (size_t i = 0; i < tal_count(ids); i++) { n = get_node(daemon->rstate, &ids[i]); if (n) append_node(&nodes, n); } } else { struct node_map_iter i; n = node_map_first(daemon->rstate->nodes, &i); while (n != NULL) { append_node(&nodes, n); n = node_map_next(daemon->rstate->nodes, &i); } } out = towire_gossip_getnodes_reply(daemon, nodes); daemon_conn_send(&daemon->master, take(out)); tal_free(tmpctx); return daemon_conn_read_next(conn, &daemon->master); } 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(peer, false, 0))); goto out; } ping = make_ping(peer, num_pong_bytes, len); if (tal_len(ping) > 65535) status_failed(STATUS_FAIL_MASTER_IO, "Oversize ping"); msg_enqueue(&peer->local->peer_out, take(ping)); status_trace("sending ping expecting %sresponse", num_pong_bytes >= 65532 ? "no " : ""); /* BOLT #1: * * if `num_pong_bytes` is less than 65532 it MUST respond by sending a * `pong` message with `byteslen` equal to `num_pong_bytes`, otherwise * it MUST ignore the `ping`. */ if (num_pong_bytes >= 65532) daemon_conn_send(&daemon->master, take(towire_gossip_ping_reply(peer, true, 0))); else peer->local->num_pings_outstanding++; out: return daemon_conn_read_next(conn, &daemon->master); } static int make_listen_fd(int domain, void *addr, socklen_t len, bool reportfail) { int fd = socket(domain, SOCK_STREAM, 0); if (fd < 0) { status_trace("Failed to create %u socket: %s", domain, strerror(errno)); return -1; } if (addr) { int on = 1; /* Re-use, please.. */ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) status_unusual("Failed setting socket reuse: %s", strerror(errno)); if (bind(fd, addr, len) != 0) { if (reportfail) status_broken("Failed to bind on %u socket: %s", domain, strerror(errno)); goto fail; } } if (listen(fd, 5) != 0) { status_broken("Failed to listen on %u socket: %s", domain, strerror(errno)); goto fail; } return fd; fail: close_noerr(fd); return -1; } static void gossip_send_keepalive_update(struct routing_state *rstate, struct half_chan *hc) { tal_t *tmpctx = tal_tmpctx(rstate); secp256k1_ecdsa_signature sig; struct bitcoin_blkid chain_hash; struct short_channel_id scid; u32 timestamp, fee_base_msat, fee_proportional_millionths; u64 htlc_minimum_msat; u16 flags, cltv_expiry_delta; u8 *update, *msg, *err; /* Parse old update */ if (!fromwire_channel_update( hc->channel_update, &sig, &chain_hash, &scid, ×tamp, &flags, &cltv_expiry_delta, &htlc_minimum_msat, &fee_base_msat, &fee_proportional_millionths)) { status_failed( STATUS_FAIL_INTERNAL_ERROR, "Unable to parse previously accepted channel_update"); } /* Now generate a new update, with up to date timestamp */ timestamp = time_now().ts.tv_sec; update = towire_channel_update(tmpctx, &sig, &chain_hash, &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(tmpctx, msg, &update)) { status_failed(STATUS_FAIL_HSM_IO, "Reading cupdate_sig_req: %s", strerror(errno)); } status_trace("Sending keepalive channel_update for %s", type_to_string(tmpctx, struct short_channel_id, &scid)); err = handle_channel_update(rstate, update); if (err) status_failed(STATUS_FAIL_INTERNAL_ERROR, "rejected keepalive channel_update: %s", tal_hex(trc, err)); tal_free(tmpctx); } 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 (!hc->channel_update) { /* Connection is not public 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 (!hc->active) { /* Only send keepalives for active connections */ continue; } gossip_send_keepalive_update(daemon->rstate, hc); } } route_prune(daemon->rstate); } static struct io_plan *connection_in(struct io_conn *conn, struct daemon *daemon) { struct wireaddr addr; struct sockaddr_storage s; socklen_t len = sizeof(s); if (getpeername(io_conn_fd(conn), (struct sockaddr *)&s, &len) != 0) { status_unusual("Failed to get peername for incoming conn: %s", strerror(errno)); return io_close(conn); } if (s.ss_family == AF_INET6) { struct sockaddr_in6 *s6 = (void *)&s; addr.type = ADDR_TYPE_IPV6; addr.addrlen = sizeof(s6->sin6_addr); BUILD_ASSERT(sizeof(s6->sin6_addr) <= sizeof(addr.addr)); memcpy(addr.addr, &s6->sin6_addr, addr.addrlen); addr.port = ntohs(s6->sin6_port); } else if (s.ss_family == AF_INET) { struct sockaddr_in *s4 = (void *)&s; addr.type = ADDR_TYPE_IPV4; addr.addrlen = sizeof(s4->sin_addr); BUILD_ASSERT(sizeof(s4->sin_addr) <= sizeof(addr.addr)); memcpy(addr.addr, &s4->sin_addr, addr.addrlen); addr.port = ntohs(s4->sin_port); } else { status_broken("Unknown socket type %i for incoming conn", s.ss_family); return io_close(conn); } /* FIXME: Timeout */ return responder_handshake(conn, &daemon->id, &addr, init_new_peer, daemon); } static void setup_listeners(struct daemon *daemon, u16 portnum) { struct sockaddr_in addr; struct sockaddr_in6 addr6; socklen_t len; int fd1, fd2; if (!portnum) { status_info("Zero portnum, not listening for incoming"); return; } memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr.s_addr = INADDR_ANY; addr.sin_port = htons(portnum); memset(&addr6, 0, sizeof(addr6)); addr6.sin6_family = AF_INET6; addr6.sin6_addr = in6addr_any; addr6.sin6_port = htons(portnum); /* IPv6, since on Linux that (usually) binds to IPv4 too. */ fd1 = make_listen_fd(AF_INET6, &addr6, sizeof(addr6), true); if (fd1 >= 0) { struct sockaddr_in6 in6; len = sizeof(in6); if (getsockname(fd1, (void *)&in6, &len) != 0) { status_broken("Failed get IPv6 sockname: %s", strerror(errno)); close_noerr(fd1); fd1 = -1; } else { addr.sin_port = in6.sin6_port; assert(portnum == ntohs(addr.sin_port)); status_trace("Creating IPv6 listener on port %u", portnum); io_new_listener(daemon, fd1, connection_in, daemon); } } /* Just in case, aim for the same port... */ fd2 = make_listen_fd(AF_INET, &addr, sizeof(addr), false); if (fd2 >= 0) { len = sizeof(addr); if (getsockname(fd2, (void *)&addr, &len) != 0) { status_broken("Failed get IPv4 sockname: %s", strerror(errno)); close_noerr(fd2); fd2 = -1; } else { assert(portnum == ntohs(addr.sin_port)); status_trace("Creating IPv4 listener on port %u", portnum); io_new_listener(daemon, fd2, connection_in, daemon); } } if (fd1 < 0 && fd2 < 0) status_failed(STATUS_FAIL_INTERNAL_ERROR, "Could not bind to a network address on port %u", portnum); } /* 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; u16 port; u32 update_channel_interval; if (!fromwire_gossipctl_init( daemon, msg, &daemon->broadcast_interval, &chain_hash, &daemon->id, &port, &daemon->globalfeatures, &daemon->localfeatures, &daemon->wireaddrs, daemon->rgb, daemon->alias, &update_channel_interval)) { 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); setup_listeners(daemon, port); 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(trc, 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(trc, struct short_channel_id, &scid), type_to_string(trc, struct pubkey, &keys[0]), type_to_string(trc, struct pubkey, &keys[1])); } daemon_conn_send(&daemon->master, take(towire_gossip_resolve_channel_reply(msg, keys))); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *handshake_out_success(struct io_conn *conn, const struct pubkey *id, const struct wireaddr *addr, const struct crypto_state *cs, struct reaching *reach) { return init_new_peer(conn, id, addr, cs, reach->daemon); } static struct io_plan *connection_out(struct io_conn *conn, struct reaching *reach) { /* FIXME: Timeout */ status_trace("Connected out for %s", type_to_string(trc, struct pubkey, &reach->id)); return initiator_handshake(conn, &reach->daemon->id, &reach->id, &reach->addr, handshake_out_success, reach); } static void try_connect(struct reaching *reach); static void connect_failed(struct io_conn *conn, struct reaching *reach) { u32 diff = time_now().ts.tv_sec - reach->first_attempt; reach->attempts++; if (reach->attempts >= reach->max_attempts) { status_info("Failed to connect after %d attempts, giving up " "after %d seconds", reach->attempts, diff); daemon_conn_send( &reach->daemon->master, take(towire_gossip_peer_connection_failed( conn, &reach->id, diff, reach->attempts, false))); tal_free(reach); } else { status_trace("Failed connected out for %s, will try again", type_to_string(trc, struct pubkey, &reach->id)); /* FIXME: Configurable timer! */ new_reltimer(&reach->daemon->timers, reach, time_from_sec(5), try_connect, reach); } } static struct io_plan *conn_init(struct io_conn *conn, struct reaching *reach) { struct addrinfo ai; struct sockaddr_in sin; struct sockaddr_in6 sin6; /* FIXME: make generic */ ai.ai_flags = 0; ai.ai_socktype = SOCK_STREAM; ai.ai_protocol = 0; ai.ai_canonname = NULL; ai.ai_next = NULL; switch (reach->addr.type) { case ADDR_TYPE_IPV4: ai.ai_family = AF_INET; sin.sin_family = AF_INET; sin.sin_port = htons(reach->addr.port); memcpy(&sin.sin_addr, reach->addr.addr, sizeof(sin.sin_addr)); ai.ai_addrlen = sizeof(sin); ai.ai_addr = (struct sockaddr *)&sin; break; case ADDR_TYPE_IPV6: ai.ai_family = AF_INET6; memset(&sin6, 0, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_port = htons(reach->addr.port); memcpy(&sin6.sin6_addr, reach->addr.addr, sizeof(sin6.sin6_addr)); ai.ai_addrlen = sizeof(sin6); ai.ai_addr = (struct sockaddr *)&sin6; break; case ADDR_TYPE_PADDING: /* Shouldn't happen. */ return io_close(conn); } io_set_finish(conn, connect_failed, reach); return io_connect(conn, &ai, connection_out, reach); } static void try_connect(struct reaching *reach) { struct addrhint *a; int fd; /* Already succeeded somehow? */ if (find_peer(reach->daemon, &reach->id)) { status_trace("Already reached %s, not retrying", type_to_string(trc, struct pubkey, &reach->id)); tal_free(reach); return; } a = find_addrhint(reach->daemon, &reach->id); if (!a) { /* FIXME: now try node table, dns lookups... */ status_info("No address known for %s, giving up", type_to_string(trc, struct pubkey, &reach->id)); daemon_conn_send( &reach->daemon->master, take(towire_gossip_peer_connection_failed( reach, &reach->id, time_now().ts.tv_sec - reach->first_attempt, reach->attempts, true))); tal_free(reach); return; } /* Might not even be able to create eg. IPv6 sockets */ switch (a->addr.type) { case ADDR_TYPE_IPV4: fd = socket(AF_INET, SOCK_STREAM, 0); break; case ADDR_TYPE_IPV6: fd = socket(AF_INET6, SOCK_STREAM, 0); break; default: fd = -1; errno = EPROTONOSUPPORT; break; } if (fd < 0) { status_broken("Can't open %i socket for %s (%s), giving up", a->addr.type, type_to_string(trc, struct pubkey, &reach->id), strerror(errno)); tal_free(reach); return; } reach->addr = a->addr; io_new_conn(reach, fd, conn_init, reach); } /* Returns true if we're already connected. */ static bool try_reach_peer(struct daemon *daemon, const struct pubkey *id) { struct reaching *reach; struct peer *peer; if (find_reaching(daemon, id)) { /* FIXME: Perhaps kick timer in this case? */ status_trace("try_reach_peer: already trying to reach %s", type_to_string(trc, struct pubkey, id)); return false; } /* Master might find out before we do that a peer is dead; if we * seem to be connected just mark it for reconnect. */ peer = find_peer(daemon, id); if (peer) { status_trace("reach_peer: have %s, will retry if it dies", type_to_string(trc, struct pubkey, id)); peer->reach_again = true; return true; } reach = tal(daemon, struct reaching); reach->succeeded = false; reach->daemon = daemon; reach->id = *id; reach->first_attempt = time_now().ts.tv_sec; reach->attempts = 0; reach->max_attempts = 10; list_add_tail(&daemon->reaching, &reach->list); tal_add_destructor(reach, destroy_reaching); try_connect(reach); return false; } /* This catches all kinds of failures, like network errors. */ static struct io_plan *reach_peer(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct pubkey id; if (!fromwire_gossipctl_reach_peer(msg, &id)) master_badmsg(WIRE_GOSSIPCTL_REACH_PEER, msg); /* Master can't check this itself, because that's racy. */ if (try_reach_peer(daemon, &id)) { daemon_conn_send(&daemon->master, take(towire_gossip_peer_already_connected(conn, &id))); } return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *addr_hint(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct addrhint *a = tal(daemon, struct addrhint); if (!fromwire_gossipctl_peer_addrhint(msg, &a->id, &a->addr)) master_badmsg(WIRE_GOSSIPCTL_PEER_ADDRHINT, msg); /* Replace any old one. */ tal_free(find_addrhint(daemon, &a->id)); list_add_tail(&daemon->addrhints, &a->list); tal_add_destructor(a, destroy_addrhint); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *get_peers(struct io_conn *conn, struct daemon *daemon, const u8 *msg) { struct peer *peer; size_t n = 0; struct pubkey *id = tal_arr(conn, struct pubkey, n); struct wireaddr *wireaddr = tal_arr(conn, struct wireaddr, n); const struct gossip_getnodes_entry **nodes; struct pubkey *specific_id = NULL; struct node_map_iter it; if (!fromwire_gossip_getpeers_request(msg, msg, &specific_id)) master_badmsg(WIRE_GOSSIPCTL_PEER_ADDRHINT, msg); nodes = tal_arr(conn, const struct gossip_getnodes_entry*, 0); list_for_each(&daemon->peers, peer, list) { if (specific_id && !pubkey_eq(specific_id, &peer->id)) continue; tal_resize(&id, n+1); tal_resize(&wireaddr, n+1); id[n] = peer->id; wireaddr[n] = peer->addr; struct node* nd = NULL; for (nd = node_map_first(daemon->rstate->nodes, &it); nd; nd = node_map_next(daemon->rstate->nodes, &it)) { if (pubkey_eq(&nd->id, &peer->id)) { append_node(&nodes, nd); break; } } n++; } daemon_conn_send(&daemon->master, take(towire_gossip_getpeers_reply(conn, id, wireaddr, nodes))); return daemon_conn_read_next(conn, &daemon->master); } 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); if (handle_pending_cannouncement(daemon->rstate, &scid, satoshis, outscript)) send_node_announcement(daemon); return daemon_conn_read_next(conn, &daemon->master); } static struct io_plan *handle_disable_channel(struct io_conn *conn, struct daemon *daemon, u8 *msg) { tal_t *tmpctx = tal_tmpctx(msg); struct short_channel_id scid; u8 direction; struct chan *chan; struct half_chan *hc; bool active; u16 flags, cltv_expiry_delta; u32 timestamp, fee_base_msat, fee_proportional_millionths; struct bitcoin_blkid chain_hash; secp256k1_ecdsa_signature sig; u64 htlc_minimum_msat; u8 *err; if (!fromwire_gossip_disable_channel(msg, &scid, &direction, &active) ) { status_unusual("Unable to parse %s", gossip_wire_type_name(fromwire_peektype(msg))); goto fail; } chan = get_channel(daemon->rstate, &scid); if (!chan) { status_trace( "Unable to find channel %s", type_to_string(msg, struct short_channel_id, &scid)); goto fail; } hc = &chan->half[direction]; status_trace("Disabling channel %s/%d, active %d -> %d", type_to_string(msg, struct short_channel_id, &scid), direction, hc->active, active); hc->active = active; if (!hc->channel_update) { status_trace( "Channel %s/%d doesn't have a channel_update yet, can't " "disable", type_to_string(msg, struct short_channel_id, &scid), direction); goto fail; } if (!fromwire_channel_update( hc->channel_update, &sig, &chain_hash, &scid, ×tamp, &flags, &cltv_expiry_delta, &htlc_minimum_msat, &fee_base_msat, &fee_proportional_millionths)) { status_failed( STATUS_FAIL_INTERNAL_ERROR, "Unable to parse previously accepted channel_update"); } timestamp = time_now().ts.tv_sec; if (timestamp <= hc->last_timestamp) timestamp = hc->last_timestamp + 1; /* Active is bit 1 << 1, mask and apply */ flags = (0xFFFD & flags) | (!active << 1); msg = towire_channel_update(tmpctx, &sig, &chain_hash, &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, msg))) { 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(tmpctx, msg, &msg)) { status_failed(STATUS_FAIL_HSM_IO, "Reading cupdate_sig_req: %s", strerror(errno)); } err = handle_channel_update(daemon->rstate, msg); if (err) status_failed(STATUS_FAIL_INTERNAL_ERROR, "rejected disabling channel_update: %s", tal_hex(trc, err)); fail: tal_free(tmpctx); 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 *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); status_trace("req: type %s len %zu", gossip_wire_type_name(t), tal_count(master->msg_in)); switch (t) { case WIRE_GOSSIPCTL_INIT: return gossip_init(master, daemon, master->msg_in); case WIRE_GOSSIPCTL_RELEASE_PEER: return release_peer(conn, 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_PING: return ping_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_GOSSIPCTL_HAND_BACK_PEER: return hand_back_peer(conn, daemon, master->msg_in); case WIRE_GOSSIPCTL_REACH_PEER: return reach_peer(conn, daemon, master->msg_in); case WIRE_GOSSIPCTL_PEER_ADDRHINT: return addr_hint(conn, daemon, master->msg_in); case WIRE_GOSSIP_GETPEERS_REQUEST: return get_peers(conn, daemon, master->msg_in); case WIRE_GOSSIP_GET_TXOUT_REPLY: return handle_txout_reply(conn, daemon, master->msg_in); case WIRE_GOSSIP_DISABLE_CHANNEL: return handle_disable_channel(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_GOSSIPCTL_PEER_DISCONNECT: return disconnect_peer(conn, daemon, master->msg_in); /* We send these, we don't receive them */ case WIRE_GOSSIPCTL_RELEASE_PEER_REPLY: case WIRE_GOSSIPCTL_RELEASE_PEER_REPLYFAIL: case WIRE_GOSSIP_GETNODES_REPLY: case WIRE_GOSSIP_GETROUTE_REPLY: case WIRE_GOSSIP_GETCHANNELS_REPLY: case WIRE_GOSSIP_GETPEERS_REPLY: case WIRE_GOSSIP_PING_REPLY: case WIRE_GOSSIP_RESOLVE_CHANNEL_REPLY: case WIRE_GOSSIP_PEER_CONNECTED: case WIRE_GOSSIP_PEER_ALREADY_CONNECTED: case WIRE_GOSSIP_PEER_CONNECTION_FAILED: case WIRE_GOSSIP_PEER_NONGOSSIP: 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_GET_TXOUT: case WIRE_GOSSIPCTL_PEER_DISCONNECT_REPLY: case WIRE_GOSSIPCTL_PEER_DISCONNECT_REPLYFAIL: break; } /* Master shouldn't give bad requests. */ status_failed(STATUS_FAIL_MASTER_IO, "%i: %s", t, tal_hex(trc, master->msg_in)); } #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[]) { struct daemon *daemon; subdaemon_setup(argc, argv); io_poll_override(debug_poll); daemon = tal(NULL, struct daemon); list_head_init(&daemon->peers); list_head_init(&daemon->reaching); list_head_init(&daemon->addrhints); 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); /* 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); } } return 0; } #endif