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core-lightning/gossipd/gossipd.c
Vincenzo Palazzo 7ff62b4a00 lightnind: removeDEFAULT_PORT global definition 
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
2022-06-28 06:09:01 +09:30

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/*~ Welcome to the gossip daemon: keeper of maps!
*
* This is the last "global" daemon; it has three purposes.
*
* 1. To determine routes for payments when lightningd asks.
* 2. The second purpose is to receive gossip from peers (via their
* per-peer daemons) and send it out to them.
* 3. Talk to `connectd` to to answer address queries for nodes.
*
* The gossip protocol itself is fairly simple, but has some twists which
* add complexity to this daemon.
*/
#include "config.h"
#include <ccan/cast/cast.h>
#include <ccan/tal/str/str.h>
#include <common/daemon_conn.h>
#include <common/ecdh_hsmd.h>
#include <common/lease_rates.h>
#include <common/memleak.h>
#include <common/private_channel_announcement.h>
#include <common/pseudorand.h>
#include <common/status.h>
#include <common/subdaemon.h>
#include <common/timeout.h>
#include <common/type_to_string.h>
#include <common/wire_error.h>
#include <common/wireaddr.h>
#include <connectd/connectd_gossipd_wiregen.h>
#include <errno.h>
#include <gossipd/gossip_generation.h>
#include <gossipd/gossip_store_wiregen.h>
#include <gossipd/gossipd.h>
#include <gossipd/gossipd_peerd_wiregen.h>
#include <gossipd/gossipd_wiregen.h>
#include <gossipd/queries.h>
#include <gossipd/routing.h>
#include <gossipd/seeker.h>
#include <sodium/crypto_aead_chacha20poly1305.h>
/*~ A channel consists of a `struct half_chan` for each direction, each of
* which has a `flags` word from the `channel_update`; bit 1 is
* ROUTING_FLAGS_DISABLED in the `channel_update`. But we also keep a local
* whole-channel flag which indicates it's not available; we use this when a
* peer disconnects, and generate a `channel_update` to tell the world lazily
* when someone asks. */
static void peer_disable_channels(struct daemon *daemon, const struct node *node)
{
/* If this peer had a channel with us, mark it disabled. */
struct chan_map_iter i;
const struct chan *c;
for (c = first_chan(node, &i); c; c = next_chan(node, &i)) {
int direction;
if (!local_direction(daemon->rstate, c, &direction))
continue;
local_disable_chan(daemon, c, direction);
}
}
/*~ This cancels the soft-disables when the peer reconnects. */
static void peer_enable_channels(struct daemon *daemon, const struct node *node)
{
/* If this peer had a channel with us, mark it disabled. */
struct chan_map_iter i;
const struct chan *c;
for (c = first_chan(node, &i); c; c = next_chan(node, &i)) {
int direction;
if (!local_direction(daemon->rstate, c, &direction))
continue;
local_enable_chan(daemon, c, direction);
}
}
/*~ Destroy a peer, usually because the per-peer daemon has exited.
*
* Were you wondering why we call this "destroy_peer" and not "peer_destroy"?
* I thought not! But while CCAN modules are required to keep to their own
* prefix namespace, leading to unnatural word order, we couldn't stomach that
* for our own internal use. We use 'find_foo', 'destroy_foo' and 'new_foo'.
*/
static void destroy_peer(struct peer *peer)
{
struct node *node;
/* Remove it from the peers list */
list_del_from(&peer->daemon->peers, &peer->list);
/* If we have a channel with this peer, disable it. */
node = get_node(peer->daemon->rstate, &peer->id);
if (node)
peer_disable_channels(peer->daemon, node);
}
/* Search for a peer. */
struct peer *find_peer(struct daemon *daemon, const struct node_id *id)
{
struct peer *peer;
list_for_each(&daemon->peers, peer, list)
if (node_id_eq(&peer->id, id))
return peer;
return NULL;
}
/* Increase a peer's gossip_counter, if peer not NULL */
void peer_supplied_good_gossip(struct peer *peer, size_t amount)
{
if (peer)
peer->gossip_counter += amount;
}
/* Queue a gossip message for the peer: connectd simply forwards it to
* the peer. */
void queue_peer_msg(struct peer *peer, const u8 *msg TAKES)
{
u8 *outermsg = towire_gossipd_send_gossip(NULL, &peer->id, msg);
daemon_conn_send(peer->daemon->connectd, take(outermsg));
if (taken(msg))
tal_free(msg);
}
/*~ We have a helper for messages from the store. */
void queue_peer_from_store(struct peer *peer,
const struct broadcastable *bcast)
{
struct gossip_store *gs = peer->daemon->rstate->gs;
queue_peer_msg(peer, take(gossip_store_get(NULL, gs, bcast->index)));
}
/*~ We don't actually keep node_announcements in memory; we keep them in
* a file called `gossip_store`. If we need some node details, we reload
* and reparse. It's slow, but generally rare. */
static bool get_node_announcement(const tal_t *ctx,
struct daemon *daemon,
const struct node *n,
u8 rgb_color[3],
u8 alias[32],
u8 **features,
struct wireaddr **wireaddrs,
struct lease_rates **rates)
{
const u8 *msg;
struct node_id id;
secp256k1_ecdsa_signature signature;
u32 timestamp;
u8 *addresses;
struct tlv_node_ann_tlvs *na_tlvs;
if (!n->bcast.index)
return false;
msg = gossip_store_get(tmpctx, daemon->rstate->gs, n->bcast.index);
/* Note: validity of node_id is already checked. */
if (!fromwire_node_announcement(ctx, msg,
&signature, features,
&timestamp,
&id, rgb_color, alias,
&addresses,
&na_tlvs)) {
status_broken("Bad local node_announcement @%u: %s",
n->bcast.index, tal_hex(tmpctx, msg));
return false;
}
if (!node_id_eq(&id, &n->id) || timestamp != n->bcast.timestamp) {
status_broken("Wrong node_announcement @%u:"
" expected %s timestamp %u "
" got %s timestamp %u",
n->bcast.index,
type_to_string(tmpctx, struct node_id, &n->id),
timestamp,
type_to_string(tmpctx, struct node_id, &id),
n->bcast.timestamp);
return false;
}
*wireaddrs = fromwire_wireaddr_array(ctx, addresses);
*rates = tal_steal(ctx, na_tlvs->option_will_fund);
tal_free(addresses);
return true;
}
/* Version which also does nodeid lookup */
static bool get_node_announcement_by_id(const tal_t *ctx,
struct daemon *daemon,
const struct node_id *node_id,
u8 rgb_color[3],
u8 alias[32],
u8 **features,
struct wireaddr **wireaddrs,
struct lease_rates **rates)
{
struct node *n = get_node(daemon->rstate, node_id);
if (!n)
return false;
return get_node_announcement(ctx, daemon, n, rgb_color, alias,
features, wireaddrs, rates);
}
/*~Routines to handle gossip messages from peer, forwarded by subdaemons.
*-----------------------------------------------------------------------
*
* It's not the subdaemon's fault if they're malformed or invalid; so these
* all return an error packet which gets sent back to the subdaemon in that
* case.
*/
/* The routing code checks that it's basically valid, returning an
* error message for the peer or NULL. NULL means it's OK, but the
* message might be redundant, in which case scid is also NULL.
* Otherwise `scid` gives us the short_channel_id claimed by the
* message, and puts the announcemnt on an internal 'pending'
* queue. We'll send a request to lightningd to look it up, and continue
* processing in `handle_txout_reply`. */
static const u8 *handle_channel_announcement_msg(struct daemon *daemon,
struct peer *peer,
const u8 *msg)
{
const struct short_channel_id *scid;
const u8 *err;
/* If it's OK, tells us the short_channel_id to lookup; it notes
* if this is the unknown channel the peer was looking for (in
* which case, it frees and NULLs that ptr) */
err = handle_channel_announcement(daemon->rstate, msg,
daemon->current_blockheight,
&scid, peer);
if (err)
return err;
else if (scid) {
/* We give them some grace period, in case we don't know about
* block yet. */
if (daemon->current_blockheight == 0
|| !is_scid_depth_announceable(scid,
daemon->current_blockheight)) {
tal_arr_expand(&daemon->deferred_txouts, *scid);
} else {
daemon_conn_send(daemon->master,
take(towire_gossipd_get_txout(NULL,
scid)));
}
}
return NULL;
}
static u8 *handle_channel_update_msg(struct peer *peer, const u8 *msg)
{
struct short_channel_id unknown_scid;
/* Hand the channel_update to the routing code */
u8 *err;
unknown_scid.u64 = 0;
err = handle_channel_update(peer->daemon->rstate, msg, peer,
&unknown_scid, false);
if (err)
return err;
/* If it's an unknown channel, ask someone about it */
if (unknown_scid.u64 != 0)
query_unknown_channel(peer->daemon, peer, &unknown_scid);
/*~ As a nasty compromise in the spec, we only forward `channel_announce`
* once we have a `channel_update`; the channel isn't *usable* for
* routing until you have both anyway. For this reason, we might have
* just sent out our own channel_announce, so we check if it's time to
* send a node_announcement too. */
maybe_send_own_node_announce(peer->daemon, false);
return NULL;
}
static u8 *handle_node_announce(struct peer *peer, const u8 *msg)
{
bool was_unknown = false;
u8 *err;
err = handle_node_announcement(peer->daemon->rstate, msg, peer,
&was_unknown);
if (was_unknown)
query_unknown_node(peer->daemon->seeker, peer);
return err;
}
static void handle_local_channel_announcement(struct daemon *daemon, const u8 *msg)
{
u8 *cannouncement;
const u8 *err;
struct node_id id;
struct peer *peer;
if (!fromwire_gossipd_local_channel_announcement(msg, msg,
&id,
&cannouncement))
master_badmsg(WIRE_GOSSIPD_LOCAL_CHANNEL_ANNOUNCEMENT, msg);
/* We treat it OK even if peer has disconnected since (unlikely though!) */
peer = find_peer(daemon, &id);
if (!peer)
status_broken("Unknown peer %s for local_channel_announcement",
type_to_string(tmpctx, struct node_id, &id));
err = handle_channel_announcement_msg(daemon, peer, cannouncement);
if (err) {
status_broken("peer %s invalid local_channel_announcement %s (%s)",
type_to_string(tmpctx, struct node_id, &id),
tal_hex(tmpctx, msg),
tal_hex(tmpctx, err));
}
}
/* channeld (via lightningd) tells us about (as-yet?) unannounce channel.
* It needs us to put it in gossip_store. */
static void handle_local_private_channel(struct daemon *daemon, const u8 *msg)
{
struct node_id id;
struct amount_sat capacity;
u8 *features;
struct short_channel_id scid;
const u8 *cannounce;
if (!fromwire_gossipd_local_private_channel(msg, msg,
&id, &capacity, &scid,
&features))
master_badmsg(WIRE_GOSSIPD_LOCAL_PRIVATE_CHANNEL, msg);
cannounce = private_channel_announcement(tmpctx,
&scid,
&daemon->id,
&id,
features);
if (!routing_add_private_channel(daemon->rstate, &id, capacity,
cannounce, 0)) {
status_peer_broken(&id, "bad add_private_channel %s",
tal_hex(tmpctx, cannounce));
}
}
/* lightningd tells us it has dicovered and verified new `remote_addr`.
* We can use this to update our node announcement. */
static void handle_remote_addr(struct daemon *daemon, const u8 *msg)
{
struct wireaddr remote_addr;
if (!fromwire_gossipd_remote_addr(msg, &remote_addr))
master_badmsg(WIRE_GOSSIPD_REMOTE_ADDR, msg);
/* current best guess is that we use default port on public internet */
remote_addr.port = chainparams_get_ln_port(chainparams);
switch (remote_addr.type) {
case ADDR_TYPE_IPV4:
if (daemon->remote_addr_v4 != NULL &&
wireaddr_eq_without_port(daemon->remote_addr_v4,
&remote_addr))
break;
tal_free(daemon->remote_addr_v4);
daemon->remote_addr_v4 = tal_dup(daemon, struct wireaddr,
&remote_addr);
goto update_node_annoucement;
case ADDR_TYPE_IPV6:
if (daemon->remote_addr_v6 != NULL &&
wireaddr_eq_without_port(daemon->remote_addr_v6,
&remote_addr))
break;
tal_free(daemon->remote_addr_v6);
daemon->remote_addr_v6 = tal_dup(daemon, struct wireaddr,
&remote_addr);
goto update_node_annoucement;
/* ignore all other cases */
case ADDR_TYPE_TOR_V2_REMOVED:
case ADDR_TYPE_TOR_V3:
case ADDR_TYPE_DNS:
case ADDR_TYPE_WEBSOCKET:
break;
}
return;
update_node_annoucement:
status_debug("Update our node_announcement for discovered address: %s",
fmt_wireaddr(tmpctx, &remote_addr));
maybe_send_own_node_announce(daemon, false);
}
/*~ This is where connectd tells us about a new peer we might want to
* gossip with. */
static void connectd_new_peer(struct daemon *daemon, const u8 *msg)
{
struct peer *peer = tal(daemon, struct peer);
struct node *node;
if (!fromwire_gossipd_new_peer(msg, &peer->id,
&peer->gossip_queries_feature)) {
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Bad new_peer msg from connectd: %s",
tal_hex(tmpctx, msg));
}
if (find_peer(daemon, &peer->id)) {
status_broken("Peer %s already here?",
type_to_string(tmpctx, struct node_id, &peer->id));
tal_free(find_peer(daemon, &peer->id));
}
/* Populate the rest of the peer info. */
peer->daemon = daemon;
peer->gossip_counter = 0;
peer->scid_queries = NULL;
peer->scid_query_idx = 0;
peer->scid_query_nodes = NULL;
peer->scid_query_nodes_idx = 0;
peer->scid_query_outstanding = false;
peer->range_replies = NULL;
peer->query_channel_range_cb = NULL;
/* We keep a list so we can find peer by id */
list_add_tail(&peer->daemon->peers, &peer->list);
tal_add_destructor(peer, destroy_peer);
node = get_node(daemon->rstate, &peer->id);
if (node)
peer_enable_channels(daemon, node);
/* This sends the initial timestamp filter. */
seeker_setup_peer_gossip(daemon->seeker, peer);
}
static void connectd_peer_gone(struct daemon *daemon, const u8 *msg)
{
struct node_id id;
struct peer *peer;
if (!fromwire_gossipd_peer_gone(msg, &id)) {
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Bad peer_gone msg from connectd: %s",
tal_hex(tmpctx, msg));
}
peer = find_peer(daemon, &id);
if (!peer)
status_broken("Peer %s already gone?",
type_to_string(tmpctx, struct node_id, &id));
tal_free(peer);
}
/*~ lightningd asks us if we know any addresses for a given id. */
static struct io_plan *handle_get_address(struct io_conn *conn,
struct daemon *daemon,
const u8 *msg)
{
struct node_id id;
u8 rgb_color[3];
u8 alias[32];
u8 *features;
struct wireaddr *addrs;
struct lease_rates *rates;
if (!fromwire_gossipd_get_addrs(msg, &id))
master_badmsg(WIRE_GOSSIPD_GET_ADDRS, msg);
if (!get_node_announcement_by_id(tmpctx, daemon, &id,
rgb_color, alias, &features, &addrs,
&rates))
addrs = NULL;
daemon_conn_send(daemon->master,
take(towire_gossipd_get_addrs_reply(NULL, addrs)));
return daemon_conn_read_next(conn, daemon->master);
}
static void handle_recv_gossip(struct daemon *daemon, const u8 *outermsg)
{
struct node_id id;
u8 *msg;
const u8 *err;
struct peer *peer;
if (!fromwire_gossipd_recv_gossip(outermsg, outermsg, &id, &msg)) {
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Bad gossipd_recv_gossip msg from connectd: %s",
tal_hex(tmpctx, outermsg));
}
peer = find_peer(daemon, &id);
if (!peer) {
status_broken("connectd sent gossip msg %s from unknown peer %s",
peer_wire_name(fromwire_peektype(msg)),
type_to_string(tmpctx, struct node_id, &id));
return;
}
/* These are messages relayed from peer */
switch ((enum peer_wire)fromwire_peektype(msg)) {
case WIRE_CHANNEL_ANNOUNCEMENT:
err = handle_channel_announcement_msg(peer->daemon, peer, msg);
goto handled_msg;
case WIRE_CHANNEL_UPDATE:
err = handle_channel_update_msg(peer, msg);
goto handled_msg;
case WIRE_NODE_ANNOUNCEMENT:
err = handle_node_announce(peer, msg);
goto handled_msg;
case WIRE_QUERY_CHANNEL_RANGE:
err = handle_query_channel_range(peer, msg);
goto handled_msg;
case WIRE_REPLY_CHANNEL_RANGE:
err = handle_reply_channel_range(peer, msg);
goto handled_msg;
case WIRE_QUERY_SHORT_CHANNEL_IDS:
err = handle_query_short_channel_ids(peer, msg);
goto handled_msg;
case WIRE_REPLY_SHORT_CHANNEL_IDS_END:
err = handle_reply_short_channel_ids_end(peer, msg);
goto handled_msg;
/* These are non-gossip messages (!is_msg_for_gossipd()) */
case WIRE_WARNING:
case WIRE_INIT:
case WIRE_ERROR:
case WIRE_PING:
case WIRE_PONG:
case WIRE_OPEN_CHANNEL:
case WIRE_ACCEPT_CHANNEL:
case WIRE_FUNDING_CREATED:
case WIRE_FUNDING_SIGNED:
case WIRE_FUNDING_LOCKED:
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_UPDATE_FEE:
case WIRE_UPDATE_BLOCKHEIGHT:
case WIRE_CHANNEL_REESTABLISH:
case WIRE_ANNOUNCEMENT_SIGNATURES:
case WIRE_GOSSIP_TIMESTAMP_FILTER:
case WIRE_TX_ADD_INPUT:
case WIRE_TX_REMOVE_INPUT:
case WIRE_TX_ADD_OUTPUT:
case WIRE_TX_REMOVE_OUTPUT:
case WIRE_TX_COMPLETE:
case WIRE_TX_SIGNATURES:
case WIRE_OPEN_CHANNEL2:
case WIRE_ACCEPT_CHANNEL2:
case WIRE_INIT_RBF:
case WIRE_ACK_RBF:
case WIRE_OBS2_ONION_MESSAGE:
case WIRE_ONION_MESSAGE:
#if EXPERIMENTAL_FEATURES
case WIRE_STFU:
#endif
break;
}
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"connectd sent unexpected gossip msg %s for peer %s",
peer_wire_name(fromwire_peektype(msg)),
type_to_string(tmpctx, struct node_id, &peer->id));
handled_msg:
if (err)
queue_peer_msg(peer, take(err));
}
/*~ connectd's input handler is very simple. */
static struct io_plan *connectd_req(struct io_conn *conn,
const u8 *msg,
struct daemon *daemon)
{
enum connectd_gossipd_wire t = fromwire_peektype(msg);
switch (t) {
case WIRE_GOSSIPD_RECV_GOSSIP:
handle_recv_gossip(daemon, msg);
goto handled;
case WIRE_GOSSIPD_NEW_PEER:
connectd_new_peer(daemon, msg);
goto handled;
case WIRE_GOSSIPD_PEER_GONE:
connectd_peer_gone(daemon, msg);
goto handled;
/* We send these, don't receive them. */
case WIRE_GOSSIPD_SEND_GOSSIP:
break;
}
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Bad msg from connectd2: %s", tal_hex(tmpctx, msg));
handled:
return daemon_conn_read_next(conn, daemon->connectd);
}
/* BOLT #7:
*
* A node:
* - if a channel's oldest `channel_update`s `timestamp` is older than two weeks
* (1209600 seconds):
* - MAY prune the channel.
* - MAY ignore the channel.
*/
static void gossip_refresh_network(struct daemon *daemon)
{
u64 now = gossip_time_now(daemon->rstate).ts.tv_sec;
s64 highwater;
struct node *n;
/* Send out 1 day before deadline */
highwater = now - (GOSSIP_PRUNE_INTERVAL(daemon->rstate->dev_fast_gossip)
- GOSSIP_BEFORE_DEADLINE(daemon->rstate->dev_fast_gossip_prune));
/* Schedule next run now */
notleak(new_reltimer(&daemon->timers, daemon,
time_from_sec(GOSSIP_PRUNE_INTERVAL(daemon->rstate->dev_fast_gossip_prune)/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 */
struct chan_map_iter i;
struct chan *c;
for (c = first_chan(n, &i); c; c = next_chan(n, &i)) {
struct half_chan *hc;
int direction;
if (!local_direction(daemon->rstate, c, &direction))
continue;
hc = &c->half[direction];
if (!is_halfchan_defined(hc)) {
/* Connection is not announced yet, so don't even
* try to re-announce it */
continue;
}
if (hc->bcast.timestamp > highwater) {
/* No need to send a keepalive update message */
continue;
}
status_debug("Sending keepalive channel_update"
" for %s/%u",
type_to_string(tmpctx,
struct short_channel_id,
&c->scid), direction);
refresh_local_channel(daemon, c, direction);
}
}
/* Now we've refreshed our channels, we can prune without clobbering
* them */
route_prune(daemon->rstate);
}
/* Disables all channels connected to our node. */
static void gossip_disable_local_channels(struct daemon *daemon)
{
struct node *local_node = get_node(daemon->rstate, &daemon->id);
struct chan_map_iter i;
struct chan *c;
/* We don't have a local_node, so we don't have any channels yet
* either */
if (!local_node)
return;
for (c = first_chan(local_node, &i); c; c = next_chan(local_node, &i))
local_disable_chan(daemon, c, half_chan_idx(local_node, c));
}
struct peer *random_peer(struct daemon *daemon,
bool (*check_peer)(const struct peer *peer))
{
u64 target = UINT64_MAX;
struct peer *best = NULL, *i;
/* Reservoir sampling */
list_for_each(&daemon->peers, i, list) {
u64 r;
if (!check_peer(i))
continue;
r = pseudorand_u64();
if (r <= target) {
best = i;
target = r;
}
}
return best;
}
/* This is called when lightningd or connectd closes its connection to
* us. We simply exit. */
static void master_or_connectd_gone(struct daemon_conn *dc UNUSED)
{
daemon_shutdown();
/* Can't tell master, it's gone. */
exit(2);
}
/*~ Parse init message from lightningd: starts the daemon properly. */
static void gossip_init(struct daemon *daemon, const u8 *msg)
{
u32 *dev_gossip_time;
bool dev_fast_gossip, dev_fast_gossip_prune;
u32 timestamp;
if (!fromwire_gossipd_init(daemon, msg,
&chainparams,
&daemon->our_features,
&daemon->id,
daemon->rgb,
daemon->alias,
&daemon->announceable,
&dev_gossip_time,
&dev_fast_gossip,
&dev_fast_gossip_prune)) {
master_badmsg(WIRE_GOSSIPD_INIT, msg);
}
daemon->rstate = new_routing_state(daemon,
&daemon->id,
&daemon->peers,
&daemon->timers,
take(dev_gossip_time),
dev_fast_gossip,
dev_fast_gossip_prune);
/* Load stored gossip messages, get last modified time of file */
timestamp = gossip_store_load(daemon->rstate, daemon->rstate->gs);
/* If last_timestamp was > modified time of file, reduce it.
* Usually it's capped to "now", but in the reload case it needs to
* be the gossip_store mtime. */
if (daemon->rstate->last_timestamp > timestamp)
daemon->rstate->last_timestamp = timestamp;
/* Now disable all local channels, they can't be connected yet. */
gossip_disable_local_channels(daemon);
/* If that announced channels, we can announce ourselves (options
* or addresses might have changed!) */
maybe_send_own_node_announce(daemon, true);
/* Start the twice- weekly refresh timer. */
notleak(new_reltimer(&daemon->timers, daemon,
time_from_sec(GOSSIP_PRUNE_INTERVAL(daemon->rstate->dev_fast_gossip_prune) / 4),
gossip_refresh_network, daemon));
/* Fire up the seeker! */
daemon->seeker = new_seeker(daemon);
/* connectd is already started, and uses this fd to feed/recv gossip. */
daemon->connectd = daemon_conn_new(daemon, CONNECTD_FD,
connectd_req,
maybe_send_query_responses, daemon);
tal_add_destructor(daemon->connectd, master_or_connectd_gone);
/* OK, we are ready. */
daemon_conn_send(daemon->master,
take(towire_gossipd_init_reply(NULL)));
}
static void new_blockheight(struct daemon *daemon, const u8 *msg)
{
if (!fromwire_gossipd_new_blockheight(msg, &daemon->current_blockheight))
master_badmsg(WIRE_GOSSIPD_NEW_BLOCKHEIGHT, msg);
/* Check if we can now send any deferred queries. */
for (size_t i = 0; i < tal_count(daemon->deferred_txouts); i++) {
const struct short_channel_id *scid
= &daemon->deferred_txouts[i];
if (!is_scid_depth_announceable(scid,
daemon->current_blockheight))
continue;
/* short_channel_id is deep enough, now ask about it. */
daemon_conn_send(daemon->master,
take(towire_gossipd_get_txout(NULL, scid)));
tal_arr_remove(&daemon->deferred_txouts, i);
i--;
}
daemon_conn_send(daemon->master,
take(towire_gossipd_new_blockheight_reply(NULL)));
}
#if DEVELOPER
static void dev_gossip_memleak(struct daemon *daemon, const u8 *msg)
{
struct htable *memtable;
bool found_leak;
memtable = memleak_find_allocations(tmpctx, msg, msg);
/* Now delete daemon and those which it has pointers to. */
memleak_remove_region(memtable, daemon, sizeof(*daemon));
found_leak = dump_memleak(memtable, memleak_status_broken);
daemon_conn_send(daemon->master,
take(towire_gossipd_dev_memleak_reply(NULL,
found_leak)));
}
static void dev_compact_store(struct daemon *daemon, const u8 *msg)
{
bool done = gossip_store_compact(daemon->rstate->gs);
daemon_conn_send(daemon->master,
take(towire_gossipd_dev_compact_store_reply(NULL,
done)));
}
static void dev_gossip_set_time(struct daemon *daemon, const u8 *msg)
{
u32 time;
if (!fromwire_gossipd_dev_set_time(msg, &time))
master_badmsg(WIRE_GOSSIPD_DEV_SET_TIME, msg);
if (!daemon->rstate->gossip_time)
daemon->rstate->gossip_time = tal(daemon->rstate, struct timeabs);
daemon->rstate->gossip_time->ts.tv_sec = time;
daemon->rstate->gossip_time->ts.tv_nsec = 0;
}
#endif /* DEVELOPER */
/*~ We queue incoming channel_announcement pending confirmation from lightningd
* that it really is an unspent output. Here's its reply. */
static void handle_txout_reply(struct daemon *daemon, const u8 *msg)
{
struct short_channel_id scid;
u8 *outscript;
struct amount_sat sat;
bool good;
if (!fromwire_gossipd_get_txout_reply(msg, msg, &scid, &sat, &outscript))
master_badmsg(WIRE_GOSSIPD_GET_TXOUT_REPLY, msg);
/* Outscript is NULL if it's not an unspent output */
good = handle_pending_cannouncement(daemon, daemon->rstate,
&scid, sat, outscript);
/* If we looking specifically for this, we no longer are. */
remove_unknown_scid(daemon->seeker, &scid, good);
/* Anywhere we might have announced a channel, we check if it's time to
* announce ourselves (ie. if we just announced our own first channel) */
maybe_send_own_node_announce(daemon, false);
}
/*~ lightningd tells us when about a gossip message directly, when told to by
* the addgossip RPC call. That's usually used when a plugin gets an update
* returned in an payment error. */
static void inject_gossip(struct daemon *daemon, const u8 *msg)
{
u8 *goss;
const u8 *errmsg;
const char *err;
if (!fromwire_gossipd_addgossip(msg, msg, &goss))
master_badmsg(WIRE_GOSSIPD_ADDGOSSIP, msg);
switch (fromwire_peektype(goss)) {
case WIRE_CHANNEL_ANNOUNCEMENT:
errmsg = handle_channel_announcement_msg(daemon, NULL, goss);
break;
case WIRE_NODE_ANNOUNCEMENT:
errmsg = handle_node_announcement(daemon->rstate, goss,
NULL, NULL);
break;
case WIRE_CHANNEL_UPDATE:
errmsg = handle_channel_update(daemon->rstate, goss,
NULL, NULL, true);
break;
default:
err = tal_fmt(tmpctx, "unknown gossip type %i",
fromwire_peektype(goss));
goto err_extracted;
}
/* The APIs above are designed to send error messages back to peers:
* we extract the raw string instead. */
if (errmsg) {
err = sanitize_error(tmpctx, errmsg, NULL);
tal_free(errmsg);
} else
/* Send empty string if no error. */
err = "";
err_extracted:
daemon_conn_send(daemon->master,
take(towire_gossipd_addgossip_reply(NULL, err)));
}
static void handle_new_lease_rates(struct daemon *daemon, const u8 *msg)
{
struct lease_rates *rates = tal(daemon, struct lease_rates);
if (!fromwire_gossipd_new_lease_rates(msg, rates))
master_badmsg(WIRE_GOSSIPD_NEW_LEASE_RATES, msg);
daemon->rates = tal_free(daemon->rates);
if (!lease_rates_empty(rates))
daemon->rates = rates;
else
tal_free(rates);
/* Send the update over to the peer */
maybe_send_own_node_announce(daemon, false);
}
/*~ This is where lightningd tells us that a channel's funding transaction has
* been spent. */
static void handle_outpoint_spent(struct daemon *daemon, const u8 *msg)
{
struct short_channel_id scid;
struct chan *chan;
struct routing_state *rstate = daemon->rstate;
if (!fromwire_gossipd_outpoint_spent(msg, &scid))
master_badmsg(WIRE_GOSSIPD_OUTPOINT_SPENT, msg);
chan = get_channel(rstate, &scid);
if (chan) {
status_debug(
"Deleting channel %s due to the funding outpoint being "
"spent",
type_to_string(msg, struct short_channel_id, &scid));
/* Suppress any now-obsolete updates/announcements */
add_to_txout_failures(rstate, &scid);
remove_channel_from_store(rstate, chan);
/* Freeing is sufficient since everything else is allocated off
* of the channel and this takes care of unregistering
* the channel */
free_chan(rstate, chan);
}
}
/*~ This is sent by lightningd when it kicks off 'closingd': we disable it
* in both directions.
*
* 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 void handle_local_channel_close(struct daemon *daemon, const u8 *msg)
{
struct short_channel_id scid;
struct chan *chan;
struct routing_state *rstate = daemon->rstate;
if (!fromwire_gossipd_local_channel_close(msg, &scid))
master_badmsg(WIRE_GOSSIPD_LOCAL_CHANNEL_CLOSE, msg);
chan = get_channel(rstate, &scid);
if (chan) {
int direction;
if (!local_direction(rstate, chan, &direction)) {
status_broken("Non-local channel close %s",
type_to_string(tmpctx,
struct short_channel_id,
&scid));
} else {
local_disable_chan(daemon, chan, direction);
}
}
}
/*~ This routine handles all the commands from lightningd. */
static struct io_plan *recv_req(struct io_conn *conn,
const u8 *msg,
struct daemon *daemon)
{
enum gossipd_wire t = fromwire_peektype(msg);
switch (t) {
case WIRE_GOSSIPD_INIT:
gossip_init(daemon, msg);
goto done;
case WIRE_GOSSIPD_GET_TXOUT_REPLY:
handle_txout_reply(daemon, msg);
goto done;
case WIRE_GOSSIPD_OUTPOINT_SPENT:
handle_outpoint_spent(daemon, msg);
goto done;
case WIRE_GOSSIPD_LOCAL_CHANNEL_CLOSE:
handle_local_channel_close(daemon, msg);
goto done;
case WIRE_GOSSIPD_NEW_BLOCKHEIGHT:
new_blockheight(daemon, msg);
goto done;
case WIRE_GOSSIPD_ADDGOSSIP:
inject_gossip(daemon, msg);
goto done;
case WIRE_GOSSIPD_NEW_LEASE_RATES:
handle_new_lease_rates(daemon, msg);
goto done;
case WIRE_GOSSIPD_GET_ADDRS:
return handle_get_address(conn, daemon, msg);
case WIRE_GOSSIPD_USED_LOCAL_CHANNEL_UPDATE:
handle_used_local_channel_update(daemon, msg);
goto done;
case WIRE_GOSSIPD_LOCAL_CHANNEL_UPDATE:
handle_local_channel_update(daemon, msg);
goto done;
case WIRE_GOSSIPD_LOCAL_CHANNEL_ANNOUNCEMENT:
handle_local_channel_announcement(daemon, msg);
goto done;
case WIRE_GOSSIPD_LOCAL_PRIVATE_CHANNEL:
handle_local_private_channel(daemon, msg);
goto done;
case WIRE_GOSSIPD_REMOTE_ADDR:
handle_remote_addr(daemon, msg);
goto done;
#if DEVELOPER
case WIRE_GOSSIPD_DEV_SET_MAX_SCIDS_ENCODE_SIZE:
dev_set_max_scids_encode_size(daemon, msg);
goto done;
case WIRE_GOSSIPD_DEV_MEMLEAK:
dev_gossip_memleak(daemon, msg);
goto done;
case WIRE_GOSSIPD_DEV_COMPACT_STORE:
dev_compact_store(daemon, msg);
goto done;
case WIRE_GOSSIPD_DEV_SET_TIME:
dev_gossip_set_time(daemon, msg);
goto done;
#else
case WIRE_GOSSIPD_DEV_SET_MAX_SCIDS_ENCODE_SIZE:
case WIRE_GOSSIPD_DEV_MEMLEAK:
case WIRE_GOSSIPD_DEV_COMPACT_STORE:
case WIRE_GOSSIPD_DEV_SET_TIME:
break;
#endif /* !DEVELOPER */
/* We send these, we don't receive them */
case WIRE_GOSSIPD_INIT_REPLY:
case WIRE_GOSSIPD_GET_TXOUT:
case WIRE_GOSSIPD_DEV_MEMLEAK_REPLY:
case WIRE_GOSSIPD_DEV_COMPACT_STORE_REPLY:
case WIRE_GOSSIPD_ADDGOSSIP_REPLY:
case WIRE_GOSSIPD_NEW_BLOCKHEIGHT_REPLY:
case WIRE_GOSSIPD_GET_ADDRS_REPLY:
case WIRE_GOSSIPD_GOT_LOCAL_CHANNEL_UPDATE:
break;
}
/* Master shouldn't give bad requests. */
status_failed(STATUS_FAIL_MASTER_IO, "%i: %s",
t, tal_hex(tmpctx, msg));
done:
return daemon_conn_read_next(conn, daemon->master);
}
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);
daemon->deferred_txouts = tal_arr(daemon, struct short_channel_id, 0);
daemon->node_announce_timer = NULL;
daemon->node_announce_regen_timer = NULL;
daemon->current_blockheight = 0; /* i.e. unknown */
daemon->rates = NULL;
daemon->remote_addr_v4 = NULL;
daemon->remote_addr_v6 = NULL;
list_head_init(&daemon->deferred_updates);
/* Tell the ecdh() function how to talk to hsmd */
ecdh_hsmd_setup(HSM_FD, status_failed);
/* Note the use of time_mono() here. That's a monotonic clock, which
* is really useful: it can only be used to measure relative events
* (there's no correspondence to time-since-Ken-grew-a-beard or
* anything), but unlike time_now(), this will never jump backwards by
* half a second and leave me wondering how my tests failed CI! */
timers_init(&daemon->timers, time_mono());
/* Our daemons always use STDIN for commands from lightningd. */
daemon->master = daemon_conn_new(daemon, STDIN_FILENO,
recv_req, NULL, daemon);
tal_add_destructor(daemon->master, master_or_connectd_gone);
status_setup_async(daemon->master);
/* This loop never exits. io_loop() only returns if a timer has
* expired, or io_break() is called, or all fds are closed. We don't
* use io_break and closing the lightningd fd calls master_gone()
* which exits. */
for (;;) {
struct timer *expired = NULL;
io_loop(&daemon->timers, &expired);
timer_expired(expired);
}
}
/*~ Note that the actual routing stuff is in routing.c; you might want to
* check that out later.
*
* But that's the last of the global daemons. We now move on to the first of
* the per-peer daemons: openingd/openingd.c.
*/
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