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channeld: Track penalty_bases internally

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`lightningd` passes in all the known penalty_bases when starting a new
`channeld` instance, which tracks them internally, eventually matching them
with revocations and passing them back to `lightningd` so it can create the
penalty transaction. From here it is just a small step to having `channeld`
also generate the penalty transaction if desired.
This commit is contained in:
Christian Decker 2020-05-07 10:19:43 +09:30 committed by Rusty Russell
parent 4af1db9ad5
commit ce471eabe0
3 changed files with 26 additions and 2 deletions
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2
channeld/channel_wire.csv
View File

@ -65,6 +65,8 @@ msgdata,channel_init,remote_ann_bitcoin_sig,?secp256k1_ecdsa_signature,
msgdata,channel_init,option_static_remotekey,bool,
msgdata,channel_init,dev_fast_gossip,bool,
msgdata,channel_init,dev_fail_process_onionpacket,bool,
msgdata,channel_init,num_penalty_bases,u32,
msgdata,channel_init,pbases,penalty_base,num_penalty_bases
# master->channeld funding hit new depth(funding locked if >= lock depth)
msgtype,channel_funding_depth,1002

1 #include <common/cryptomsg.h>
65 msgdata,channel_init,dev_fast_gossip,bool,
66 msgdata,channel_init,dev_fail_process_onionpacket,bool,
67 # master->channeld funding hit new depth(funding locked if >= lock depth) msgdata,channel_init,num_penalty_bases,u32,
68 msgdata,channel_init,pbases,penalty_base,num_penalty_bases
69 # master->channeld funding hit new depth(funding locked if >= lock depth)
70 msgtype,channel_funding_depth,1002
71 msgdata,channel_funding_depth,short_channel_id,?short_channel_id,
72 msgdata,channel_funding_depth,depth,u32,

19
channeld/channeld.c
View File

@ -170,6 +170,9 @@ struct peer {
/* Empty commitments. Spec violation, but a minor one. */
u64 last_empty_commitment;
/* Penalty bases for this channel / peer. */
struct penalty_base **pbases;
};
static u8 *create_channel_announcement(const tal_t *ctx, struct peer *peer);
@ -1032,6 +1035,10 @@ static void send_commit(struct peer *peer)
if (direct_outputs[LOCAL] != NULL) {
pbase = penalty_base_new(tmpctx, peer->next_index[REMOTE],
txs[0], direct_outputs[LOCAL]);
/* Add the penalty_base to our in-memory list as well, so we
* can find it again later. */
tal_arr_expand(&peer->pbases, tal_steal(peer, pbase));
} else
pbase = NULL;
@ -3085,6 +3092,7 @@ static void init_channel(struct peer *peer)
secp256k1_ecdsa_signature *remote_ann_node_sig;
secp256k1_ecdsa_signature *remote_ann_bitcoin_sig;
bool option_static_remotekey;
struct penalty_base *pbases;
#if !DEVELOPER
bool dev_fail_process_onionpacket; /* Ignored */
#endif
@ -3143,10 +3151,19 @@ static void init_channel(struct peer *peer)
&remote_ann_bitcoin_sig,
&option_static_remotekey,
&dev_fast_gossip,
&dev_fail_process_onionpacket)) {
&dev_fail_process_onionpacket,
&pbases)) {
master_badmsg(WIRE_CHANNEL_INIT, msg);
}
/* Keeping an array of pointers is better since it allows us to avoid
* extra allocations later. */
peer->pbases = tal_arr(peer, struct penalty_base *, 0);
for (size_t i=0; i<tal_count(pbases); i++)
tal_arr_expand(&peer->pbases,
tal_dup(peer, struct penalty_base, &pbases[i]));
tal_free(pbases);
/* stdin == requests, 3 == peer, 4 = gossip, 5 = gossip_store, 6 = HSM */
per_peer_state_set_fds(peer->pps, 3, 4, 5);

7
lightningd/channel_control.c
View File

@ -385,6 +385,7 @@ void peer_start_channeld(struct channel *channel,
bool reached_announce_depth;
struct secret last_remote_per_commit_secret;
secp256k1_ecdsa_signature *remote_ann_node_sig, *remote_ann_bitcoin_sig;
struct penalty_base *pbases;
hsmfd = hsm_get_client_fd(ld, &channel->peer->id,
channel->dbid,
@ -463,6 +464,9 @@ void peer_start_channeld(struct channel *channel,
return;
}
pbases = wallet_penalty_base_load_for_channel(
tmpctx, channel->peer->ld->wallet, channel->dbid);
initmsg = towire_channel_init(tmpctx,
chainparams,
ld->our_features,
@ -517,7 +521,8 @@ void peer_start_channeld(struct channel *channel,
* negotiated now! */
channel->option_static_remotekey,
IFDEV(ld->dev_fast_gossip, false),
IFDEV(dev_fail_process_onionpacket, false));
IFDEV(dev_fail_process_onionpacket, false),
pbases);
/* We don't expect a response: we are triggered by funding_depth_cb. */
subd_send_msg(channel->owner, take(initmsg));