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multiplex.c
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/*~ This contains all the code to shuffle data between socket to the peer
* itself, and the subdaemons. */
#include "config.h"
#include <assert.h>
#include <bitcoin/block.h>
#include <bitcoin/chainparams.h>
#include <ccan/io/io.h>
#include <common/cryptomsg.h>
#include <common/daemon_conn.h>
#include <common/dev_disconnect.h>
#include <common/features.h>
#include <common/gossip_constants.h>
#include <common/gossip_store.h>
#include <common/memleak.h>
#include <common/per_peer_state.h>
#include <common/ping.h>
#include <common/status.h>
#include <common/timeout.h>
#include <common/type_to_string.h>
#include <common/utils.h>
#include <common/wire_error.h>
#include <connectd/connectd.h>
#include <connectd/connectd_gossipd_wiregen.h>
#include <connectd/connectd_wiregen.h>
#include <connectd/gossip_rcvd_filter.h>
#include <connectd/multiplex.h>
#include <connectd/onion_message.h>
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <wire/peer_wire.h>
#include <wire/wire.h>
#include <wire/wire_io.h>
#include <wire/wire_sync.h>
struct subd {
/* Owner: we are in peer->subds[] */
struct peer *peer;
/* The temporary or permanant channel_id */
struct channel_id channel_id;
/* In passing, we can have a temporary one, too. */
struct channel_id *temporary_channel_id;
/* The opening revocation basepoint, for v2 channel_id. */
struct pubkey *opener_revocation_basepoint;
/* The actual connection to talk to it (NULL if it's not connected yet) */
struct io_conn *conn;
/* Input buffer */
u8 *in;
/* Output buffer */
struct msg_queue *outq;
};
static struct subd *find_subd(struct peer *peer,
const struct channel_id *channel_id)
{
for (size_t i = 0; i < tal_count(peer->subds); i++) {
struct subd *subd = peer->subds[i];
/* Once we see a message using the real channel_id, we
* clear the temporary_channel_id */
if (channel_id_eq(&subd->channel_id, channel_id)) {
subd->temporary_channel_id
= tal_free(subd->temporary_channel_id);
return subd;
}
if (subd->temporary_channel_id
&& channel_id_eq(subd->temporary_channel_id, channel_id)) {
return subd;
}
}
return NULL;
}
/* Except for a reconnection, we finally free a peer when the io_conn
* is closed and all subds are gone. */
static void maybe_free_peer(struct peer *peer)
{
if (peer->to_peer)
return;
if (tal_count(peer->subds) != 0)
return;
status_debug("maybe_free_peer freeing peer!");
tal_free(peer);
}
/* We try to send the final messages, but if buffer is full and they're
* not reading, we have to give up. */
static void close_peer_io_timeout(struct peer *peer)
{
/* BROKEN means we'll trigger CI if we see it, though it's possible */
status_peer_broken(&peer->id, "Peer did not close, forcing close");
io_close(peer->to_peer);
}
static void close_subd_timeout(struct subd *subd)
{
/* BROKEN means we'll trigger CI if we see it, though it's possible */
status_peer_broken(&subd->peer->id, "Subd did not close, forcing close");
io_close(subd->conn);
}
static void drain_peer(struct peer *peer)
{
status_debug("drain_peer");
assert(!peer->draining);
/* Since we immediately free any subds we didn't connect yet,
* we need peer->to_peer set so it won't free peer! */
assert(peer->to_peer);
/* Give the subds 5 seconds to close their fds to us. */
for (size_t i = 0; i < tal_count(peer->subds); i++) {
if (!peer->subds[i]->conn) {
/* Deletes itself from array, so be careful! */
tal_free(peer->subds[i]);
i--;
continue;
}
status_debug("drain_peer draining subd!");
notleak(new_reltimer(&peer->daemon->timers,
peer->subds[i], time_from_sec(5),
close_subd_timeout, peer->subds[i]));
/* Wake any outgoing queued on subd */
io_wake(peer->subds[i]->outq);
}
/* Wake them to ensure they notice the close! */
io_wake(&peer->subds);
if (peer->to_peer) {
/* You have 5 seconds to drain... */
notleak(new_reltimer(&peer->daemon->timers,
peer->to_peer, time_from_sec(5),
close_peer_io_timeout, peer));
}
/* Clean peer from hashtable; we no longer exist. */
destroy_peer(peer);
tal_del_destructor(peer, destroy_peer);
/* This is a 5-second leak, worst case! */
notleak(peer);
/* Start draining process! */
io_wake(peer->peer_outq);
}
void inject_peer_msg(struct peer *peer, const u8 *msg TAKES)
{
status_peer_io(LOG_IO_OUT, &peer->id, msg);
msg_enqueue(peer->peer_outq, msg);
}
void multiplex_final_msg(struct peer *peer, const u8 *final_msg TAKES)
{
inject_peer_msg(peer, final_msg);
drain_peer(peer);
}
/* Send warning, close connection to peer */
static void send_warning(struct peer *peer, const char *fmt, ...)
{
va_list ap;
u8 *msg;
va_start(ap, fmt);
status_vfmt(LOG_UNUSUAL, &peer->id, fmt, ap);
va_end(ap);
va_start(ap, fmt);
msg = towire_warningfmtv(NULL, NULL, fmt, ap);
va_end(ap);
multiplex_final_msg(peer, take(msg));
}
/* Kicks off write_to_peer() to look for more gossip to send from store */
static void wake_gossip(struct peer *peer);
static struct oneshot *gossip_stream_timer(struct peer *peer)
{
u32 next;
/* BOLT #7:
*
* A node:
*...
* - SHOULD flush outgoing gossip messages once every 60 seconds,
* independently of the arrival times of the messages.
* - Note: this results in staggered announcements that are unique
* (not duplicated).
*/
/* We shorten this for dev_fast_gossip! */
next = GOSSIP_FLUSH_INTERVAL(peer->daemon->dev_fast_gossip);
return new_reltimer(&peer->daemon->timers,
peer, time_from_sec(next),
wake_gossip, peer);
}
/* It's so common to ask for "recent" gossip (we ask for 10 minutes
* ago, LND and Eclair ask for now, LDK asks for 1 hour ago) that it's
* worth keeping track of where that starts, so we can skip most of
* the store. */
static void update_recent_timestamp(struct daemon *daemon)
{
/* 2 hours allows for some clock drift, not too much gossip */
u32 recent = time_now().ts.tv_sec - 7200;
/* Only update every minute */
if (daemon->gossip_recent_time + 60 > recent)
return;
daemon->gossip_recent_time = recent;
daemon->gossip_store_recent_off
= find_gossip_store_by_timestamp(daemon->gossip_store_fd,
daemon->gossip_store_recent_off,
daemon->gossip_recent_time);
}
/* This is called once we need it: otherwise, the gossip_store may not exist,
* since we start at the same time as gossipd itself. */
static void setup_gossip_store(struct daemon *daemon)
{
daemon->gossip_store_fd = open(GOSSIP_STORE_FILENAME, O_RDONLY);
if (daemon->gossip_store_fd < 0)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Opening gossip_store %s: %s",
GOSSIP_STORE_FILENAME, strerror(errno));
daemon->gossip_recent_time = 0;
daemon->gossip_store_recent_off = 1;
update_recent_timestamp(daemon);
/* gossipd will be writing to this, and it's not atomic! Safest
* way to find the "end" is to walk through. */
daemon->gossip_store_end
= find_gossip_store_end(daemon->gossip_store_fd,
daemon->gossip_store_recent_off);
}
void setup_peer_gossip_store(struct peer *peer,
const struct feature_set *our_features,
const u8 *their_features)
{
/* Lazy setup */
if (peer->daemon->gossip_store_fd == -1)
setup_gossip_store(peer->daemon);
peer->gs.grf = new_gossip_rcvd_filter(peer);
/* BOLT #7:
*
* A node:
* - if the `gossip_queries` feature is negotiated:
* - MUST NOT relay any gossip messages it did not generate itself,
* unless explicitly requested.
*/
if (feature_negotiated(our_features, their_features, OPT_GOSSIP_QUERIES)) {
peer->gs.gossip_timer = NULL;
peer->gs.active = false;
peer->gs.off = 1;
return;
}
peer->gs.gossip_timer = gossip_stream_timer(peer);
peer->gs.active = IFDEV(!peer->daemon->dev_suppress_gossip, true);
peer->gs.timestamp_min = 0;
peer->gs.timestamp_max = UINT32_MAX;
/* BOLT #7:
*
* - upon receiving an `init` message with the
* `initial_routing_sync` flag set to 1:
* - SHOULD send gossip messages for all known channels and
* nodes, as if they were just received.
* - if the `initial_routing_sync` flag is set to 0, OR if the
* initial sync was completed:
* - SHOULD resume normal operation, as specified in the
* following [Rebroadcasting](#rebroadcasting) section.
*/
if (feature_offered(their_features, OPT_INITIAL_ROUTING_SYNC))
peer->gs.off = 1;
else {
/* During tests, particularly, we find that the gossip_store
* moves fast, so make sure it really does start at the end. */
peer->gs.off
= find_gossip_store_end(peer->daemon->gossip_store_fd,
peer->daemon->gossip_store_end);
}
}
/* We're happy for the kernel to batch update and gossip messages, but a
* commitment message, for example, should be instantly sent. There's no
* great way of doing this, unfortunately.
*
* Setting TCP_NODELAY on Linux flushes the socket, which really means
* we'd want to toggle on then off it *after* sending. But Linux has
* TCP_CORK. On FreeBSD, it seems (looking at source) not to, so
* there we'd want to set it before the send, and reenable it
* afterwards. Even if this is wrong on other non-Linux platforms, it
* only means one extra packet.
*/
static void set_urgent_flag(struct peer *peer, bool urgent)
{
int val;
int opt;
const char *optname;
static bool complained = false;
if (urgent == peer->urgent)
return;
#ifdef TCP_CORK
opt = TCP_CORK;
optname = "TCP_CORK";
#elif defined(TCP_NODELAY)
opt = TCP_NODELAY;
optname = "TCP_NODELAY";
#else
#error "Please report platform with neither TCP_CORK nor TCP_NODELAY?"
#endif
val = urgent;
if (setsockopt(io_conn_fd(peer->to_peer),
IPPROTO_TCP, opt, &val, sizeof(val)) != 0) {
/* This actually happens in testing, where we blackhole the fd */
if (!complained) {
status_unusual("setsockopt %s=1: %s",
optname,
strerror(errno));
complained = true;
}
}
peer->urgent = urgent;
}
static bool is_urgent(enum peer_wire type)
{
switch (type) {
case WIRE_INIT:
case WIRE_ERROR:
case WIRE_WARNING:
case WIRE_TX_ADD_INPUT:
case WIRE_TX_ADD_OUTPUT:
case WIRE_TX_REMOVE_INPUT:
case WIRE_TX_REMOVE_OUTPUT:
case WIRE_TX_COMPLETE:
case WIRE_TX_SIGNATURES:
case WIRE_OPEN_CHANNEL:
case WIRE_ACCEPT_CHANNEL:
case WIRE_FUNDING_CREATED:
case WIRE_FUNDING_SIGNED:
case WIRE_FUNDING_LOCKED:
case WIRE_OPEN_CHANNEL2:
case WIRE_ACCEPT_CHANNEL2:
case WIRE_INIT_RBF:
case WIRE_ACK_RBF:
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_UPDATE_FEE:
case WIRE_UPDATE_BLOCKHEIGHT:
case WIRE_CHANNEL_REESTABLISH:
case WIRE_ANNOUNCEMENT_SIGNATURES:
case WIRE_CHANNEL_ANNOUNCEMENT:
case WIRE_NODE_ANNOUNCEMENT:
case WIRE_CHANNEL_UPDATE:
case WIRE_QUERY_SHORT_CHANNEL_IDS:
case WIRE_REPLY_SHORT_CHANNEL_IDS_END:
case WIRE_QUERY_CHANNEL_RANGE:
case WIRE_REPLY_CHANNEL_RANGE:
case WIRE_GOSSIP_TIMESTAMP_FILTER:
case WIRE_OBS2_ONION_MESSAGE:
case WIRE_ONION_MESSAGE:
#if EXPERIMENTAL_FEATURES
case WIRE_STFU:
#endif
return false;
/* These are time-sensitive, and so send without delay. */
case WIRE_PING:
case WIRE_PONG:
case WIRE_COMMITMENT_SIGNED:
case WIRE_REVOKE_AND_ACK:
return true;
};
/* plugins can inject other messages; assume not urgent. */
return false;
}
/* io_sock_shutdown, but in format suitable for an io_plan callback */
static struct io_plan *io_sock_shutdown_cb(struct io_conn *conn, struct peer *unused)
{
return io_sock_shutdown(conn);
}
static struct io_plan *encrypt_and_send(struct peer *peer,
const u8 *msg TAKES,
struct io_plan *(*next)
(struct io_conn *peer_conn,
struct peer *peer))
{
int type = fromwire_peektype(msg);
#if DEVELOPER
switch (dev_disconnect(&peer->id, type)) {
case DEV_DISCONNECT_BEFORE:
if (taken(msg))
tal_free(msg);
return io_close(peer->to_peer);
case DEV_DISCONNECT_AFTER:
/* Disallow reads from now on */
peer->dev_read_enabled = false;
next = (void *)io_close_cb;
break;
case DEV_DISCONNECT_BLACKHOLE:
/* Disable both reads and writes from now on */
peer->dev_read_enabled = false;
peer->dev_writes_enabled = talz(peer, u32);
break;
case DEV_DISCONNECT_NORMAL:
break;
case DEV_DISCONNECT_DISABLE_AFTER:
peer->dev_read_enabled = false;
peer->dev_writes_enabled = tal(peer, u32);
*peer->dev_writes_enabled = 1;
break;
}
#endif
set_urgent_flag(peer, is_urgent(type));
/* BOLT #1:
*
* A sending node:
*...
* - MAY close the connection after sending.
*/
if (type == WIRE_ERROR || type == WIRE_WARNING) {
/* Might already be draining... */
if (!peer->draining)
drain_peer(peer);
/* Close as soon as we've sent this. */
next = io_sock_shutdown_cb;
}
/* We free this and the encrypted version in next write_to_peer */
peer->sent_to_peer = cryptomsg_encrypt_msg(peer, &peer->cs, msg);
return io_write(peer->to_peer,
peer->sent_to_peer,
tal_bytelen(peer->sent_to_peer),
next, peer);
}
/* Kicks off write_to_peer() to look for more gossip to send from store */
static void wake_gossip(struct peer *peer)
{
bool flush_gossip_filter = true;
#if DEVELOPER
/* With dev-fast-gossip, we clean every 2 seconds, which is too
* fast for our slow tests! So we only call this one time in 5
* actually twice that, as it's not per-peer! */
static int gossip_age_count;
if (peer->daemon->dev_fast_gossip && gossip_age_count++ % 5 != 0)
flush_gossip_filter = false;
#endif
/* Don't remember sent per-peer gossip forever. */
if (flush_gossip_filter)
gossip_rcvd_filter_age(peer->gs.grf);
peer->gs.active = IFDEV(!peer->daemon->dev_suppress_gossip, true);
io_wake(peer->peer_outq);
/* And go again in 60 seconds (from now, now when we finish!) */
peer->gs.gossip_timer = gossip_stream_timer(peer);
}
/* If we are streaming gossip, get something from gossip store */
static u8 *maybe_from_gossip_store(const tal_t *ctx, struct peer *peer)
{
u8 *msg;
/* dev-mode can suppress all gossip */
if (IFDEV(peer->daemon->dev_suppress_gossip, false))
return NULL;
/* BOLT #7:
* - if the `gossip_queries` feature is negotiated:
* - MUST NOT relay any gossip messages it did not generate itself,
* unless explicitly requested.
*/
/* So, even if they didn't send us a timestamp_filter message,
* we *still* send our own gossip. */
if (!peer->gs.gossip_timer) {
return gossip_store_next(ctx, &peer->daemon->gossip_store_fd,
0, 0xFFFFFFFF,
true,
false,
&peer->gs.off,
&peer->daemon->gossip_store_end);
}
/* Not streaming right now? */
if (!peer->gs.active)
return NULL;
/* This should be around to kick us every 60 seconds */
assert(peer->gs.gossip_timer);
again:
msg = gossip_store_next(ctx, &peer->daemon->gossip_store_fd,
peer->gs.timestamp_min,
peer->gs.timestamp_max,
false,
false,
&peer->gs.off,
&peer->daemon->gossip_store_end);
/* Don't send back gossip they sent to us! */
if (msg) {
if (gossip_rcvd_filter_del(peer->gs.grf, msg)) {
msg = tal_free(msg);
goto again;
}
status_peer_io(LOG_IO_OUT, &peer->id, msg);
return msg;
}
peer->gs.active = false;
return NULL;
}
/* Mutual recursion */
static void send_ping(struct peer *peer);
static void set_ping_timer(struct peer *peer)
{
if (IFDEV(peer->daemon->dev_no_ping_timer, false)) {
peer->ping_timer = NULL;
return;
}
peer->ping_timer = new_reltimer(&peer->daemon->timers, peer,
time_from_sec(15 + pseudorand(30)),
send_ping, peer);
}
static void send_ping(struct peer *peer)
{
/* If it's still sending us traffic, maybe ping reply is backed up?
* That's OK, ping is just to make sure it's still alive, and clearly
* it is. */
if (time_before(peer->last_recv_time,
timeabs_sub(time_now(), time_from_sec(60)))) {
/* Already have a ping in flight? */
if (peer->expecting_pong != PONG_UNEXPECTED) {
status_peer_debug(&peer->id, "Last ping unreturned: hanging up");
if (peer->to_peer)
io_close(peer->to_peer);
return;
}
inject_peer_msg(peer, take(make_ping(NULL, 1, 0)));
peer->expecting_pong = PONG_EXPECTED_PROBING;
}
set_ping_timer(peer);
}
void send_custommsg(struct daemon *daemon, const u8 *msg)
{
struct node_id id;
u8 *custommsg;
struct peer *peer;
if (!fromwire_connectd_custommsg_out(tmpctx, msg, &id, &custommsg))
master_badmsg(WIRE_CONNECTD_CUSTOMMSG_OUT, msg);
/* Races can happen: this might be gone by now. */
peer = peer_htable_get(&daemon->peers, &id);
if (peer)
inject_peer_msg(peer, take(custommsg));
}
static void handle_ping_in(struct peer *peer, const u8 *msg)
{
u8 *pong;
/* gossipd doesn't log IO, so we log it here. */
status_peer_io(LOG_IO_IN, &peer->id, msg);
if (!check_ping_make_pong(NULL, msg, &pong)) {
send_warning(peer, "Invalid ping %s", tal_hex(msg, msg));
return;
}
if (pong)
inject_peer_msg(peer, take(pong));
}
static void handle_ping_reply(struct peer *peer, const u8 *msg)
{
u8 *ignored;
size_t i;
/* We print this out because we asked for pong, so can't spam us... */
if (!fromwire_pong(msg, msg, &ignored))
status_peer_unusual(&peer->id, "Got malformed ping reply %s",
tal_hex(tmpctx, msg));
/* We print this because dev versions of Core Lightning embed
* version here: see check_ping_make_pong! */
for (i = 0; i < tal_count(ignored); i++) {
if (ignored[i] < ' ' || ignored[i] == 127)
break;
}
status_debug("Got pong %zu bytes (%.*s...)",
tal_count(ignored), (int)i, (char *)ignored);
daemon_conn_send(peer->daemon->master,
take(towire_connectd_ping_reply(NULL, true,
tal_bytelen(msg))));
}
static void handle_pong_in(struct peer *peer, const u8 *msg)
{
/* gossipd doesn't log IO, so we log it here. */
status_peer_io(LOG_IO_IN, &peer->id, msg);
switch (peer->expecting_pong) {
case PONG_EXPECTED_COMMAND:
handle_ping_reply(peer, msg);
/* fall thru */
case PONG_EXPECTED_PROBING:
peer->expecting_pong = PONG_UNEXPECTED;
return;
case PONG_UNEXPECTED:
status_debug("Unexpected pong?");
return;
}
abort();
}
/* Forward to gossipd */
static void handle_gossip_in(struct peer *peer, const u8 *msg)
{
u8 *gmsg = towire_gossipd_recv_gossip(NULL, &peer->id, msg);
/* gossipd doesn't log IO, so we log it here. */
status_peer_io(LOG_IO_IN, &peer->id, msg);
daemon_conn_send(peer->daemon->gossipd, take(gmsg));
}
static void handle_gossip_timestamp_filter_in(struct peer *peer, const u8 *msg)
{
struct bitcoin_blkid chain_hash;
u32 first_timestamp, timestamp_range;
if (!fromwire_gossip_timestamp_filter(msg, &chain_hash,
&first_timestamp,
×tamp_range)) {
send_warning(peer, "gossip_timestamp_filter invalid: %s",
tal_hex(tmpctx, msg));
return;
}
/* gossipd doesn't log IO, so we log it here. */
status_peer_io(LOG_IO_IN, &peer->id, msg);
if (!bitcoin_blkid_eq(&chainparams->genesis_blockhash, &chain_hash)) {
send_warning(peer, "gossip_timestamp_filter for bad chain: %s",
tal_hex(tmpctx, msg));
return;
}
peer->gs.timestamp_min = first_timestamp;
peer->gs.timestamp_max = first_timestamp + timestamp_range - 1;
/* Make sure we never leave it on an impossible value. */
if (peer->gs.timestamp_max < peer->gs.timestamp_min)
peer->gs.timestamp_max = UINT32_MAX;
/* Optimization: they don't want anything. LND and us (at least),
* both set first_timestamp to 0xFFFFFFFF to indicate that. */
if (peer->gs.timestamp_min == UINT32_MAX)
peer->gs.off = peer->daemon->gossip_store_end;
else {
/* Second optimation: it's common to ask for "recent" gossip,
* so we don't have to start at beginning of store. */
update_recent_timestamp(peer->daemon);
if (peer->gs.timestamp_min >= peer->daemon->gossip_recent_time)
peer->gs.off = peer->daemon->gossip_store_recent_off;
else
peer->gs.off = 1;
}
/* BOLT #7:
* - MAY wait for the next outgoing gossip flush to send these.
*/
/* We send immediately the first time, after that we wait. */
if (!peer->gs.gossip_timer)
wake_gossip(peer);
}
static bool handle_custommsg(struct daemon *daemon,
struct peer *peer,
const u8 *msg)
{
enum peer_wire type = fromwire_peektype(msg);
if (type % 2 == 1 && !peer_wire_is_defined(type)) {
/* The message is not part of the messages we know how to
* handle. Assuming this is a custommsg, we just forward it to the
* master. */
status_peer_io(LOG_IO_IN, &peer->id, msg);
daemon_conn_send(daemon->master,
take(towire_connectd_custommsg_in(NULL,
&peer->id,
msg)));
return true;
} else {
return false;
}
}
/* We handle pings and gossip messages. */
static bool handle_message_locally(struct peer *peer, const u8 *msg)
{
enum peer_wire type = fromwire_peektype(msg);
/* We remember these so we don't rexmit them */
gossip_rcvd_filter_add(peer->gs.grf, msg);
if (type == WIRE_GOSSIP_TIMESTAMP_FILTER) {
handle_gossip_timestamp_filter_in(peer, msg);
return true;
} else if (type == WIRE_PING) {
handle_ping_in(peer, msg);
return true;
} else if (type == WIRE_PONG) {
handle_pong_in(peer, msg);
return true;
} else if (type == WIRE_OBS2_ONION_MESSAGE) {
handle_obs2_onion_message(peer->daemon, peer, msg);
return true;
} else if (type == WIRE_ONION_MESSAGE) {
handle_onion_message(peer->daemon, peer, msg);
return true;
} else if (handle_custommsg(peer->daemon, peer, msg)) {
return true;
}
/* Do we want to divert to gossipd? */
if (is_msg_for_gossipd(msg)) {
handle_gossip_in(peer, msg);
return true;
}
return false;
}
/* Move "channel_id" to temporary. */
static void move_channel_id_to_temp(struct subd *subd)
{
tal_free(subd->temporary_channel_id);
subd->temporary_channel_id
= tal_dup(subd, struct channel_id, &subd->channel_id);
}
/* Only works for open_channel2 and accept_channel2 */
static struct pubkey *extract_revocation_basepoint(const tal_t *ctx,
const u8 *msg)
{
const u8 *cursor = msg;
size_t max = tal_bytelen(msg);
enum peer_wire t;
struct pubkey pubkey;
t = fromwire_u16(&cursor, &max);
switch (t) {
case WIRE_OPEN_CHANNEL2:
/* BOLT-dualfund #2:
* 1. type: 64 (`open_channel2`)
* 2. data:
* * [`chain_hash`:`chain_hash`]
* * [`channel_id`:`zerod_channel_id`]
* * [`u32`:`funding_feerate_perkw`]
* * [`u32`:`commitment_feerate_perkw`]
* * [`u64`:`funding_satoshis`]
* * [`u64`:`dust_limit_satoshis`]
* * [`u64`:`max_htlc_value_in_flight_msat`]
* * [`u64`:`htlc_minimum_msat`]
* * [`u16`:`to_self_delay`]
* * [`u16`:`max_accepted_htlcs`]
* * [`u32`:`locktime`]
* * [`point`:`funding_pubkey`]
* * [`point`:`revocation_basepoint`]
*/
fromwire_pad(&cursor, &max,
sizeof(struct bitcoin_blkid)
+ sizeof(struct channel_id)
+ sizeof(u32)
+ sizeof(u32)
+ sizeof(u64)
+ sizeof(u64)
+ sizeof(u64)
+ sizeof(u64)
+ sizeof(u16)
+ sizeof(u16)
+ sizeof(u32)
+ PUBKEY_CMPR_LEN);
break;
case WIRE_ACCEPT_CHANNEL2:
/* BOLT-dualfund #2:
* 1. type: 65 (`accept_channel2`)
* 2. data:
* * [`channel_id`:`zerod_channel_id`]
* * [`u64`:`funding_satoshis`]
* * [`u64`:`dust_limit_satoshis`]
* * [`u64`:`max_htlc_value_in_flight_msat`]
* * [`u64`:`htlc_minimum_msat`]
* * [`u32`:`minimum_depth`]
* * [`u16`:`to_self_delay`]
* * [`u16`:`max_accepted_htlcs`]
* * [`point`:`funding_pubkey`]
* * [`point`:`revocation_basepoint`]
*/
fromwire_pad(&cursor, &max,
sizeof(struct channel_id)
+ sizeof(u64)
+ sizeof(u64)
+ sizeof(u64)
+ sizeof(u64)
+ sizeof(u32)
+ sizeof(u16)
+ sizeof(u16)
+ PUBKEY_CMPR_LEN);
break;
default:
abort();
}
fromwire_pubkey(&cursor, &max, &pubkey);
if (!cursor)
return NULL;
return tal_dup(ctx, struct pubkey, &pubkey);
}
/* Only works for funding_created */
static bool extract_funding_created_funding(const u8 *funding_created,
struct bitcoin_outpoint *outp)
{
const u8 *cursor = funding_created;
size_t max = tal_bytelen(funding_created);
enum peer_wire t;
t = fromwire_u16(&cursor, &max);
switch (t) {
case WIRE_FUNDING_CREATED:
/* BOLT #2:
* 1. type: 34 (`funding_created`)
* 2. data:
* * [`32*byte`:`temporary_channel_id`]
* * [`sha256`:`funding_txid`]
* * [`u16`:`funding_output_index`]
*/
fromwire_pad(&cursor, &max, 32);
fromwire_bitcoin_txid(&cursor, &max, &outp->txid);
outp->n = fromwire_u16(&cursor, &max);
break;
default:
abort();
}
return cursor != NULL;
}
static void update_v1_channelid(struct subd *subd, const u8 *funding_created)
{
struct bitcoin_outpoint outp;
if (!extract_funding_created_funding(funding_created, &outp)) {
status_peer_unusual(&subd->peer->id, "WARNING: funding_created no tx info?");
return;
}
move_channel_id_to_temp(subd);
derive_channel_id(&subd->channel_id, &outp);
}
static void update_v2_channelid(struct subd *subd, const u8 *accept_channel2)
{
struct pubkey *acc_basepoint;
acc_basepoint = extract_revocation_basepoint(tmpctx, accept_channel2);
if (!acc_basepoint) {
status_peer_unusual(&subd->peer->id, "WARNING: accept_channel2 no revocation_basepoint?");
return;
}
if (!subd->opener_revocation_basepoint) {
status_peer_unusual(&subd->peer->id, "WARNING: accept_channel2 without open_channel2?");
return;
}
move_channel_id_to_temp(subd);
derive_channel_id_v2(&subd->channel_id,
subd->opener_revocation_basepoint, acc_basepoint);
}
/* We maintain channel_id matching for subds by snooping: we set it manually
* for first packet (open_channel or open_channel2). */
static void maybe_update_channelid(struct subd *subd, const u8 *msg)
{
switch (fromwire_peektype(msg)) {
case WIRE_OPEN_CHANNEL:
extract_channel_id(msg, &subd->channel_id);
break;
case WIRE_OPEN_CHANNEL2:
subd->opener_revocation_basepoint
= extract_revocation_basepoint(subd, msg);
break;
case WIRE_ACCEPT_CHANNEL2:
update_v2_channelid(subd, msg);
break;
case WIRE_FUNDING_CREATED:
update_v1_channelid(subd, msg);
break;
}
}
static struct io_plan *write_to_peer(struct io_conn *peer_conn,
struct peer *peer)
{
const u8 *msg;
assert(peer->to_peer == peer_conn);
/* Free last sent one (if any) */
peer->sent_to_peer = tal_free(peer->sent_to_peer);
/* Pop tail of send queue */
msg = msg_dequeue(peer->peer_outq);
/* Still nothing to send? */
if (!msg) {
/* Draining? We're done when subds are done. */
if (peer->draining && tal_count(peer->subds) == 0)
return io_sock_shutdown(peer_conn);
/* If they want us to send gossip, do so now. */
if (!peer->draining)
msg = maybe_from_gossip_store(NULL, peer);
if (!msg) {
/* Tell them to read again, */
io_wake(&peer->subds);
/* Wait for them to wake us */
return msg_queue_wait(peer_conn, peer->peer_outq,
write_to_peer, peer);
}
}
/* dev_disconnect can disable writes */
#if DEVELOPER
if (peer->dev_writes_enabled) {
if (*peer->dev_writes_enabled == 0) {
tal_free(msg);
/* Continue, to drain queue */
return write_to_peer(peer_conn, peer);
}
(*peer->dev_writes_enabled)--;
}
#endif
return encrypt_and_send(peer, take(msg), write_to_peer);
}
static struct io_plan *read_from_subd(struct io_conn *subd_conn,
struct subd *subd);
static struct io_plan *read_from_subd_done(struct io_conn *subd_conn,
struct subd *subd)
{
maybe_update_channelid(subd, subd->in);
/* Tell them to encrypt & write. */
msg_enqueue(subd->peer->peer_outq, take(subd->in));