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core-lightning/gossipd/gossipd.c
Rusty Russell 4b4937b9bd gossipd: tell lightningd about all our previous channel_updates at startup. 
This will at least *help* the case where these were not populated, causing us
to send errors without channel_updated appended.

It's not perfect: we can still send such errors if the gossip store is
corrupted, and we still send them for private channels, but it should
help.

(The much better fix is far more invasive, so slips to next release!)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2023-07-29 09:44:20 +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>
const struct node_id *peer_node_id(const struct peer *peer)
{
return &peer->id;
}
bool peer_node_id_eq(const struct peer *peer, const struct node_id *node_id)
{
return node_id_eq(&peer->id, node_id);
}
/*~ 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 table */
peer_node_id_map_del(peer->daemon->peers, peer);;
/* 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);
seeker_peer_gone(peer->daemon->seeker, peer);
}
/* Search for a peer. */
struct peer *find_peer(struct daemon *daemon, const struct node_id *id)
{
return peer_node_id_map_get(daemon->peers, id);
}
/* Increase a peer's gossip_counter, if peer not NULL */
void peer_supplied_good_gossip(struct daemon *daemon,
const struct node_id *source_peer,
size_t amount)
{
struct peer *peer;
if (!source_peer)
return;
peer = find_peer(daemon, source_peer);
if (!peer)
return;
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)));
}
static void queue_priv_update(struct peer *peer,
const struct broadcastable *bcast)
{
struct gossip_store *gs = peer->daemon->rstate->gs;
queue_peer_msg(peer,
take(gossip_store_get_private_update(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,
const struct node_id *source_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, source_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->id,
&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->id,
&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;
if (!fromwire_gossipd_local_channel_announcement(msg, msg,
&id,
&cannouncement))
master_badmsg(WIRE_GOSSIPD_LOCAL_CHANNEL_ANNOUNCEMENT, msg);
err = handle_channel_announcement_msg(daemon, &id, cannouncement);
if (err) {
status_peer_broken(&id, "invalid local_channel_announcement %s (%s)",
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;
struct chan *zombie;
if (!fromwire_gossipd_local_private_channel(msg, msg,
&id, &capacity, &scid,
&features))
master_badmsg(WIRE_GOSSIPD_LOCAL_PRIVATE_CHANNEL, msg);
status_debug("received private channel announcement from channeld for %s",
type_to_string(tmpctx, struct short_channel_id, &scid));
cannounce = private_channel_announcement(tmpctx,
&scid,
&daemon->id,
&id,
features);
/* If there is already a zombie announcement for this channel in the
* store we can disregard this one. */
zombie = get_channel(daemon->rstate, &scid);
if (zombie && (zombie->half[0].zombie || zombie->half[1].zombie)){
status_debug("received channel announcement for %s,"
" but it is a zombie; discarding",
type_to_string(tmpctx, struct short_channel_id,
&scid));
return;
}
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 discovered and verified new `remote_addr`.
* We can use this to update our node announcement. */
static void handle_discovered_ip(struct daemon *daemon, const u8 *msg)
{
struct wireaddr discovered_ip;
size_t count_announceable;
if (!fromwire_gossipd_discovered_ip(msg, &discovered_ip))
master_badmsg(WIRE_GOSSIPD_DISCOVERED_IP, msg);
switch (discovered_ip.type) {
case ADDR_TYPE_IPV4:
if (daemon->discovered_ip_v4 != NULL &&
wireaddr_eq_without_port(daemon->discovered_ip_v4,
&discovered_ip))
break;
tal_free(daemon->discovered_ip_v4);
daemon->discovered_ip_v4 = tal_dup(daemon, struct wireaddr,
&discovered_ip);
goto update_node_annoucement;
case ADDR_TYPE_IPV6:
if (daemon->discovered_ip_v6 != NULL &&
wireaddr_eq_without_port(daemon->discovered_ip_v6,
&discovered_ip))
break;
tal_free(daemon->discovered_ip_v6);
daemon->discovered_ip_v6 = tal_dup(daemon, struct wireaddr,
&discovered_ip);
goto update_node_annoucement;
/* ignore all other cases */
case ADDR_TYPE_TOR_V2_REMOVED:
case ADDR_TYPE_TOR_V3:
case ADDR_TYPE_DNS:
break;
}
return;
update_node_annoucement:
count_announceable = tal_count(daemon->announceable);
if ((daemon->ip_discovery == OPT_AUTOBOOL_AUTO && count_announceable == 0) ||
daemon->ip_discovery == OPT_AUTOBOOL_TRUE)
status_debug("Update our node_announcement for discovered address: %s",
fmt_wireaddr(tmpctx, &discovered_ip));
maybe_send_own_node_announce(daemon, false);
}
/* BOLT #7:
* - if the `gossip_queries` feature is negotiated:
* - MUST NOT relay any gossip messages it did not generate itself,
* unless explicitly requested.
*/
/* i.e. the strong implication is that we spam our own gossip aggressively!
* "Look at me!" "Look at me!!!!".
*/
static void dump_our_gossip(struct daemon *daemon, struct peer *peer)
{
struct node *me;
struct chan_map_iter i;
struct chan *chan;
/* Find ourselves; if no channels, nothing to send */
me = get_node(daemon->rstate, &daemon->id);
if (!me)
return;
for (chan = first_chan(me, &i); chan; chan = next_chan(me, &i)) {
/* Don't leak private channels, unless it's with you! */
if (!is_chan_public(chan)) {
int dir = half_chan_idx(me, chan);
if (node_id_eq(&chan->nodes[!dir]->id, &peer->id)
&& is_halfchan_defined(&chan->half[dir])) {
/* There's no announce for this, of course! */
/* Private channel updates are wrapped in the store. */
queue_priv_update(peer, &chan->half[dir].bcast);
}
continue;
}
/* Send channel_announce */
queue_peer_from_store(peer, &chan->bcast);
/* Send both channel_updates (if they exist): both help people
* use our channel, so we care! */
for (int dir = 0; dir < 2; dir++) {
if (is_halfchan_defined(&chan->half[dir]))
queue_peer_from_store(peer, &chan->half[dir].bcast);
}
}
/* If we have one, we should send our own node_announcement */
if (me->bcast.index)
queue_peer_from_store(peer, &me->bcast);
}
/*~ 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 htable so we can find peer by id */
peer_node_id_map_add(daemon->peers, peer);
tal_add_destructor(peer, destroy_peer);
node = get_node(daemon->rstate, &peer->id);
if (node)
peer_enable_channels(daemon, node);
/* Send everything we know about our own channels */
dump_our_gossip(daemon, peer);
/* 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, &id, 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_CHANNEL_READY:
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_ABORT:
case WIRE_TX_SIGNATURES:
case WIRE_TX_INIT_RBF:
case WIRE_TX_ACK_RBF:
case WIRE_OPEN_CHANNEL2:
case WIRE_ACCEPT_CHANNEL2:
case WIRE_ONION_MESSAGE:
case WIRE_PEER_STORAGE:
case WIRE_YOUR_PEER_STORAGE:
case WIRE_STFU:
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 the `timestamp` of the latest `channel_update` in
* either direction 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);
}
static void tell_master_local_cupdates(struct daemon *daemon)
{
struct chan_map_iter i;
struct chan *c;
struct node *me;
me = get_node(daemon->rstate, &daemon->id);
if (!me)
return;
for (c = first_chan(me, &i); c; c = next_chan(me, &i)) {
struct half_chan *hc;
int direction;
const u8 *cupdate;
/* We don't provide update_channel for unannounced channels */
if (!is_chan_public(c))
continue;
if (!local_direction(daemon->rstate, c, &direction))
continue;
hc = &c->half[direction];
if (!is_halfchan_defined(hc))
continue;
cupdate = gossip_store_get(tmpctx,
daemon->rstate->gs,
hc->bcast.index);
daemon_conn_send(daemon->master,
take(towire_gossipd_init_cupdate(NULL,
&c->scid,
cupdate)));
}
}
/* 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 *first_random_peer(struct daemon *daemon,
struct peer_node_id_map_iter *it)
{
return peer_node_id_map_pick(daemon->peers, pseudorand_u64(), it);
}
struct peer *next_random_peer(struct daemon *daemon,
const struct peer *first,
struct peer_node_id_map_iter *it)
{
struct peer *p;
p = peer_node_id_map_next(daemon->peers, it);
if (!p)
p = peer_node_id_map_first(daemon->peers, it);
/* Full circle? */
if (p == first)
return NULL;
return p;
}
/* 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,
&daemon->ip_discovery)) {
master_badmsg(WIRE_GOSSIPD_INIT, msg);
}
daemon->rstate = new_routing_state(daemon,
daemon,
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);
/* Tell it about all our local (public) channel_update messages,
* so it doesn't unnecessarily regenerate them. */
tell_master_local_cupdates(daemon);
/* 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--;
}
routing_expire_channels(daemon->rstate, daemon->current_blockheight);
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_start(tmpctx);
memleak_ptr(memtable, msg);
/* Now delete daemon and those which it has pointers to. */
memleak_scan_obj(memtable, daemon);
memleak_scan_htable(memtable, &daemon->peers->raw);
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_outpoints_spent(struct daemon *daemon, const u8 *msg)
{
struct short_channel_id *scids;
u32 blockheight;
if (!fromwire_gossipd_outpoints_spent(msg, msg, &blockheight, &scids))
master_badmsg(WIRE_GOSSIPD_OUTPOINTS_SPENT, msg);
for (size_t i = 0; i < tal_count(scids); i++) {
struct chan *chan = get_channel(daemon->rstate, &scids[i]);
if (!chan)
continue;
/* We have a current_blockheight, but it's not necessarily
* updated first. */
routing_channel_spent(daemon->rstate, blockheight, 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_OUTPOINTS_SPENT:
handle_outpoints_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_DISCOVERED_IP:
handle_discovered_ip(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_CUPDATE:
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);
daemon->peers = tal(daemon, struct peer_node_id_map);
peer_node_id_map_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->discovered_ip_v4 = NULL;
daemon->discovered_ip_v6 = NULL;
daemon->ip_discovery = OPT_AUTOBOOL_AUTO;
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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