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https://github.com/ElementsProject/lightning.git
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be1f33b265
Currently we intuit it from the fd being closed, but that may happen out of order with when the master thinks it's dead. So now if the gossip fd closes we just ignore it, and we'll get a notification from the master when the peer is disconnected. The notification is slightly ugly in that we have to disable it for a channel when we manually hand the channel back to gossipd. Note: as stands, this is racy with reconnects. See the next patch. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
421 lines
12 KiB
C
421 lines
12 KiB
C
#include <bitcoin/script.h>
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#include <ccan/crypto/hkdf_sha256/hkdf_sha256.h>
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#include <ccan/tal/str/str.h>
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#include <common/wire_error.h>
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#include <gossipd/gen_gossip_wire.h>
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#include <inttypes.h>
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#include <lightningd/channel.h>
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#include <lightningd/gen_channel_state_names.h>
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#include <lightningd/jsonrpc.h>
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#include <lightningd/lightningd.h>
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#include <lightningd/log.h>
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#include <lightningd/peer_control.h>
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#include <lightningd/subd.h>
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static bool connects_to_peer(struct subd *owner)
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{
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return owner && owner->talks_to_peer;
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}
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void channel_set_owner(struct channel *channel, struct subd *owner)
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{
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struct subd *old_owner = channel->owner;
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channel->owner = owner;
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if (old_owner) {
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subd_release_channel(old_owner, channel);
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if (channel->connected && !connects_to_peer(owner)) {
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u8 *msg = towire_gossipctl_peer_disconnected(NULL,
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&channel->peer->id);
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subd_send_msg(channel->peer->ld->gossip, take(msg));
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channel->connected = false;
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}
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}
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channel->connected = connects_to_peer(owner);
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}
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struct htlc_out *channel_has_htlc_out(struct channel *channel)
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{
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struct htlc_out_map_iter outi;
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struct htlc_out *hout;
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struct lightningd *ld = channel->peer->ld;
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for (hout = htlc_out_map_first(&ld->htlcs_out, &outi);
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hout;
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hout = htlc_out_map_next(&ld->htlcs_out, &outi)) {
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if (hout->key.channel == channel)
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return hout;
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}
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return NULL;
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}
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struct htlc_in *channel_has_htlc_in(struct channel *channel)
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{
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struct htlc_in_map_iter ini;
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struct htlc_in *hin;
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struct lightningd *ld = channel->peer->ld;
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for (hin = htlc_in_map_first(&ld->htlcs_in, &ini);
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hin;
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hin = htlc_in_map_next(&ld->htlcs_in, &ini)) {
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if (hin->key.channel == channel)
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return hin;
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}
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return NULL;
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}
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static void destroy_channel(struct channel *channel)
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{
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/* Must not have any HTLCs! */
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struct htlc_out *hout = channel_has_htlc_out(channel);
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struct htlc_in *hin = channel_has_htlc_in(channel);
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if (hout)
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fatal("Freeing channel %s has hout %s",
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channel_state_name(channel),
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htlc_state_name(hout->hstate));
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if (hin)
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fatal("Freeing channel %s has hin %s",
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channel_state_name(channel),
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htlc_state_name(hin->hstate));
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/* Free any old owner still hanging around. */
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channel_set_owner(channel, NULL);
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list_del_from(&channel->peer->channels, &channel->list);
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}
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void delete_channel(struct channel *channel)
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{
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struct peer *peer = channel->peer;
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wallet_channel_delete(channel->peer->ld->wallet, channel->dbid);
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tal_free(channel);
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/* Last one out frees the peer */
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if (list_empty(&peer->channels) && !peer->uncommitted_channel)
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delete_peer(peer);
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}
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/* FIXME: We have no business knowing this! */
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/**
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* derive_channel_seed - Generate a unique secret for this peer's channel
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*
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* @ld: the lightning daemon to get global secret from
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* @seed: where to store the generated secret
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* @peer_id: the id node_id of the remote peer
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* @dbid: channel DBID
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*
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* This method generates a unique secret from the given parameters. It
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* is important that this secret be unique for each channel, but it
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* must be reproducible for the same channel in case of
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* reconnection. We use the DB channel ID to guarantee unique secrets
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* per channel.
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*/
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void derive_channel_seed(struct lightningd *ld, struct privkey *seed,
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const struct pubkey *peer_id,
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const u64 dbid)
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{
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u8 input[PUBKEY_DER_LEN + sizeof(dbid)];
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char *info = "per-peer seed";
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pubkey_to_der(input, peer_id);
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memcpy(input + PUBKEY_DER_LEN, &dbid, sizeof(dbid));
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assert(dbid != 0);
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hkdf_sha256(seed, sizeof(*seed),
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input, sizeof(input),
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&ld->peer_seed, sizeof(ld->peer_seed),
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info, strlen(info));
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}
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struct channel *new_channel(struct peer *peer, u64 dbid,
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/* NULL or stolen */
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struct wallet_shachain *their_shachain,
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enum channel_state state,
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enum side funder,
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/* NULL or stolen */
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struct log *log,
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const char *transient_billboard TAKES,
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u8 channel_flags,
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const struct channel_config *our_config,
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u32 minimum_depth,
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u64 next_index_local,
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u64 next_index_remote,
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u64 next_htlc_id,
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const struct bitcoin_txid *funding_txid,
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u16 funding_outnum,
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u64 funding_satoshi,
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u64 push_msat,
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bool remote_funding_locked,
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/* NULL or stolen */
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struct short_channel_id *scid,
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u64 our_msatoshi,
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u64 msatoshi_to_us_min,
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u64 msatoshi_to_us_max,
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/* Stolen */
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struct bitcoin_tx *last_tx,
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const secp256k1_ecdsa_signature *last_sig,
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/* NULL or stolen */
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secp256k1_ecdsa_signature *last_htlc_sigs,
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const struct channel_info *channel_info,
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/* NULL or stolen */
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u8 *remote_shutdown_scriptpubkey,
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u64 final_key_idx,
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bool last_was_revoke,
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/* NULL or stolen */
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struct changed_htlc *last_sent_commit,
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u32 first_blocknum,
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u32 min_possible_feerate,
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u32 max_possible_feerate,
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bool connected)
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{
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struct channel *channel = tal(peer->ld, struct channel);
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assert(dbid != 0);
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channel->peer = peer;
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channel->dbid = dbid;
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channel->error = NULL;
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if (their_shachain)
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channel->their_shachain = *their_shachain;
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else {
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channel->their_shachain.id = 0;
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shachain_init(&channel->their_shachain.chain);
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}
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channel->state = state;
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channel->funder = funder;
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channel->owner = NULL;
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memset(&channel->billboard, 0, sizeof(channel->billboard));
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channel->billboard.transient = tal_strdup(channel, transient_billboard);
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if (!log) {
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/* FIXME: update log prefix when we get scid */
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/* FIXME: Use minimal unique pubkey prefix for logs! */
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char *idname = type_to_string(peer, struct pubkey, &peer->id);
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channel->log = new_log(channel,
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peer->log_book, "%s chan #%"PRIu64":",
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idname, dbid);
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tal_free(idname);
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} else
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channel->log = tal_steal(channel, log);
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channel->channel_flags = channel_flags;
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channel->our_config = *our_config;
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channel->minimum_depth = minimum_depth;
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channel->next_index[LOCAL] = next_index_local;
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channel->next_index[REMOTE] = next_index_remote;
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channel->next_htlc_id = next_htlc_id;
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channel->funding_txid = *funding_txid;
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channel->funding_outnum = funding_outnum;
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channel->funding_satoshi = funding_satoshi;
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channel->push_msat = push_msat;
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channel->remote_funding_locked = remote_funding_locked;
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channel->scid = tal_steal(channel, scid);
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channel->our_msatoshi = our_msatoshi;
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channel->msatoshi_to_us_min = msatoshi_to_us_min;
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channel->msatoshi_to_us_max = msatoshi_to_us_max;
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channel->last_tx = tal_steal(channel, last_tx);
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channel->last_sig = *last_sig;
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channel->last_htlc_sigs = tal_steal(channel, last_htlc_sigs);
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channel->channel_info = *channel_info;
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channel->remote_shutdown_scriptpubkey
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= tal_steal(channel, remote_shutdown_scriptpubkey);
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channel->final_key_idx = final_key_idx;
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channel->last_was_revoke = last_was_revoke;
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channel->last_sent_commit = tal_steal(channel, last_sent_commit);
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channel->first_blocknum = first_blocknum;
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channel->min_possible_feerate = min_possible_feerate;
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channel->max_possible_feerate = max_possible_feerate;
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channel->connected = connected;
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derive_channel_seed(peer->ld, &channel->seed, &peer->id, channel->dbid);
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list_add_tail(&peer->channels, &channel->list);
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tal_add_destructor(channel, destroy_channel);
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/* Make sure we see any spends using this key */
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txfilter_add_scriptpubkey(peer->ld->owned_txfilter,
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take(p2wpkh_for_keyidx(NULL, peer->ld,
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channel->final_key_idx)));
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return channel;
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}
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const char *channel_state_name(const struct channel *channel)
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{
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return channel_state_str(channel->state);
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}
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const char *channel_state_str(enum channel_state state)
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{
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for (size_t i = 0; enum_channel_state_names[i].name; i++)
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if (enum_channel_state_names[i].v == state)
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return enum_channel_state_names[i].name;
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return "unknown";
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}
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struct channel *peer_active_channel(struct peer *peer)
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{
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struct channel *channel;
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list_for_each(&peer->channels, channel, list) {
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if (channel_active(channel))
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return channel;
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}
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return NULL;
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}
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struct channel *active_channel_by_id(struct lightningd *ld,
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const struct pubkey *id,
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struct uncommitted_channel **uc)
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{
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struct peer *peer = peer_by_id(ld, id);
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if (!peer) {
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if (uc)
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*uc = NULL;
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return NULL;
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}
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if (uc)
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*uc = peer->uncommitted_channel;
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return peer_active_channel(peer);
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}
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struct channel *channel_by_dbid(struct lightningd *ld, const u64 dbid)
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{
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struct peer *p;
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struct channel *chan;
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list_for_each(&ld->peers, p, list) {
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list_for_each(&p->channels, chan, list) {
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if (chan->dbid == dbid)
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return chan;
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}
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}
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return NULL;
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}
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void channel_set_last_tx(struct channel *channel,
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struct bitcoin_tx *tx,
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const secp256k1_ecdsa_signature *sig)
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{
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channel->last_sig = *sig;
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tal_free(channel->last_tx);
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channel->last_tx = tal_steal(channel, tx);
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}
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void channel_set_state(struct channel *channel,
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enum channel_state old_state,
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enum channel_state state)
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{
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log_info(channel->log, "State changed from %s to %s",
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channel_state_name(channel), channel_state_str(state));
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if (channel->state != old_state)
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fatal("channel state %s should be %s",
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channel_state_name(channel), channel_state_str(old_state));
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channel->state = state;
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/* TODO(cdecker) Selectively save updated fields to DB */
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wallet_channel_save(channel->peer->ld->wallet, channel);
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}
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void channel_fail_permanent(struct channel *channel, const char *fmt, ...)
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{
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struct lightningd *ld = channel->peer->ld;
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va_list ap;
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char *why;
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struct channel_id cid;
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u8 *msg;
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va_start(ap, fmt);
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why = tal_vfmt(channel, fmt, ap);
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va_end(ap);
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if (channel->scid) {
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u8 *msg = towire_gossip_disable_channel(NULL,
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channel->scid,
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channel->peer->direction,
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false);
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subd_send_msg(ld->gossip, take(msg));
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}
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log_unusual(channel->log, "Peer permanent failure in %s: %s",
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channel_state_name(channel), why);
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/* We can have multiple errors, eg. onchaind failures. */
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if (!channel->error) {
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derive_channel_id(&cid,
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&channel->funding_txid,
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channel->funding_outnum);
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channel->error = towire_errorfmt(channel, &cid, "%s", why);
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}
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/* Tell gossipd we no longer need to keep connection to this peer */
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msg = towire_gossipctl_peer_important(NULL, &channel->peer->id, false);
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subd_send_msg(ld->gossip, take(msg));
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channel_set_owner(channel, NULL);
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/* Drop non-cooperatively (unilateral) to chain. */
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drop_to_chain(ld, channel, false);
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tal_free(why);
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}
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void channel_internal_error(struct channel *channel, const char *fmt, ...)
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{
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va_list ap;
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char *why;
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va_start(ap, fmt);
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why = tal_vfmt(channel, fmt, ap);
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va_end(ap);
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log_broken(channel->log, "Peer internal error %s: %s",
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channel_state_name(channel), why);
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/* Don't expose internal error causes to remove unless doing dev */
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#if DEVELOPER
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channel_fail_permanent(channel, "Internal error: %s", why);
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#else
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channel_fail_permanent(channel, "Internal error");
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#endif
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tal_free(why);
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}
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void channel_set_billboard(struct channel *channel, bool perm, const char *str)
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{
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const char **p;
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if (perm)
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p = &channel->billboard.permanent[channel->state];
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else
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p = &channel->billboard.transient;
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*p = tal_free(*p);
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if (str) {
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*p = tal_fmt(channel, "%s:%s", channel_state_name(channel), str);
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if (taken(str))
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tal_free(str);
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}
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}
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void channel_fail_transient(struct channel *channel, const char *fmt, ...)
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{
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va_list ap;
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const char *why;
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va_start(ap, fmt);
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why = tal_vfmt(channel, fmt, ap);
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va_end(ap);
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log_info(channel->log, "Peer transient failure in %s: %s",
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channel_state_name(channel), why);
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tal_free(why);
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#if DEVELOPER
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if (dev_disconnect_permanent(channel->peer->ld)) {
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channel_internal_error(channel, "dev_disconnect permfail");
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return;
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}
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#endif
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channel_set_owner(channel, NULL);
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}
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