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941 lines
26 KiB
941 lines
26 KiB
#include <bitcoin/privkey.h>
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#include <bitcoin/script.h>
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#include <ccan/tal/str/str.h>
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#include <common/channel_config.h>
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#include <common/funding_tx.h>
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#include <common/key_derive.h>
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#include <common/wallet_tx.h>
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#include <common/wire_error.h>
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#include <errno.h>
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#include <gossipd/gen_gossip_wire.h>
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#include <hsmd/gen_hsm_client_wire.h>
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#include <lightningd/chaintopology.h>
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#include <lightningd/channel_control.h>
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#include <lightningd/closing_control.h>
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#include <lightningd/hsm_control.h>
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#include <lightningd/json.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/opening_control.h>
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#include <lightningd/peer_control.h>
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#include <lightningd/subd.h>
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#include <openingd/gen_opening_wire.h>
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#include <wire/wire.h>
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#include <wire/wire_sync.h>
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/* Channel we're still opening. */
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struct uncommitted_channel {
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/* peer->uncommitted_channel == this */
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struct peer *peer;
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/* openingd which is running now */
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struct subd *openingd;
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/* Reserved dbid for if we become a real struct channel */
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u64 dbid;
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/* For logging */
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struct log *log;
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/* Openingd can tell us stuff. */
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const char *transient_billboard;
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/* If we offered channel, this contains information, otherwise NULL */
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struct funding_channel *fc;
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/* Secret seed (FIXME: Move to hsm!) */
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struct privkey seed;
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/* Blockheight at creation, scans for funding confirmations
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* will start here */
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u64 first_blocknum;
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/* These are *not* filled in by new_uncommitted_channel: */
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/* Minimum funding depth (if funder == REMOTE). */
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u32 minimum_depth;
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/* Our channel config. */
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struct channel_config our_config;
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};
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struct funding_channel {
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/* In lightningd->fundchannels while waiting for gossipd reply. */
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struct list_node list;
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struct command *cmd; /* Which also owns us. */
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struct wallet_tx wtx;
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u64 push_msat;
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u8 channel_flags;
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/* Peer we're trying to reach. */
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struct pubkey peerid;
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/* Channel. */
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struct uncommitted_channel *uc;
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};
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static struct funding_channel *find_funding_channel(struct lightningd *ld,
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const struct pubkey *id)
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{
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struct funding_channel *i;
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list_for_each(&ld->fundchannels, i, list) {
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if (pubkey_eq(&i->peerid, id))
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return i;
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}
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return NULL;
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}
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static void remove_funding_channel_from_list(struct funding_channel *fc)
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{
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list_del_from(&fc->cmd->ld->fundchannels, &fc->list);
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}
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/* Opening failed: hand back to gossipd (sending errpkt if not NULL) */
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static void uncommitted_channel_to_gossipd(struct lightningd *ld,
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struct uncommitted_channel *uc,
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const struct crypto_state *cs,
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int peer_fd, int gossip_fd,
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const u8 *errorpkt,
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const char *fmt,
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...)
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{
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va_list ap;
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char *errstr;
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u8 *msg;
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va_start(ap, fmt);
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errstr = tal_vfmt(uc, fmt, ap);
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va_end(ap);
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log_unusual(uc->log, "Opening channel: %s", errstr);
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if (uc->fc)
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command_fail(uc->fc->cmd, "%s", errstr);
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/* Hand back to gossipd, (maybe) with an error packet to send. */
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msg = towire_gossipctl_hand_back_peer(errstr, &uc->peer->id, cs,
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errorpkt);
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subd_send_msg(ld->gossip, take(msg));
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subd_send_fd(ld->gossip, peer_fd);
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subd_send_fd(ld->gossip, gossip_fd);
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}
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void kill_uncommitted_channel(struct uncommitted_channel *uc,
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const char *why)
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{
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log_info(uc->log, "Killing openingd: %s", why);
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/* Close openingd. */
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subd_release_channel(uc->openingd, uc);
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uc->openingd = NULL;
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if (uc->fc)
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command_fail(uc->fc->cmd, "%s", why);
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tal_free(uc);
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}
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void json_add_uncommitted_channel(struct json_result *response,
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const struct uncommitted_channel *uc)
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{
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if (!uc)
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return;
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json_object_start(response, NULL);
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json_add_string(response, "state", "OPENINGD");
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json_add_string(response, "owner", "lightning_openingd");
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json_add_string(response, "funder",
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uc->fc ? "LOCAL" : "REMOTE");
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if (uc->transient_billboard) {
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json_array_start(response, "status");
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json_add_string(response, NULL, uc->transient_billboard);
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json_array_end(response);
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}
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if (uc->fc) {
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u64 msatoshi_total, our_msatoshi;
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msatoshi_total = uc->fc->wtx.amount * 1000;
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our_msatoshi = msatoshi_total - uc->fc->push_msat;
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json_add_u64(response, "msatoshi_to_us", our_msatoshi);
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json_add_u64(response, "msatoshi_total", msatoshi_total);
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}
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json_object_end(response);
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}
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/* Steals fields from uncommitted_channel: returns NULL if can't generate a
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* key for this channel (shouldn't happen!). */
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static struct channel *
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wallet_commit_channel(struct lightningd *ld,
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struct uncommitted_channel *uc,
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struct bitcoin_tx *remote_commit,
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secp256k1_ecdsa_signature *remote_commit_sig,
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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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u8 channel_flags,
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struct channel_info *channel_info,
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u32 feerate)
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{
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struct channel *channel;
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u64 our_msatoshi;
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s64 final_key_idx;
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/* Get a key to use for closing outputs from this tx */
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final_key_idx = wallet_get_newindex(ld);
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if (final_key_idx == -1) {
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log_broken(uc->log, "Can't get final key index");
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return NULL;
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}
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if (uc->fc)
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our_msatoshi = funding_satoshi * 1000 - push_msat;
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else
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our_msatoshi = push_msat;
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/* Feerates begin identical. */
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channel_info->feerate_per_kw[LOCAL]
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= channel_info->feerate_per_kw[REMOTE]
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= feerate;
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/* old_remote_per_commit not valid yet, copy valid one. */
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channel_info->old_remote_per_commit = channel_info->remote_per_commit;
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channel = new_channel(uc->peer, uc->dbid,
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NULL, /* No shachain yet */
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CHANNELD_AWAITING_LOCKIN,
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uc->fc ? LOCAL : REMOTE,
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uc->log,
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take(uc->transient_billboard),
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channel_flags,
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&uc->our_config,
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uc->minimum_depth,
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1, 1, 0,
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funding_txid,
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funding_outnum,
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funding_satoshi,
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push_msat,
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false, /* !remote_funding_locked */
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NULL, /* no scid yet */
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/* The three arguments below are msatoshi_to_us,
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* msatoshi_to_us_min, and msatoshi_to_us_max.
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* Because, this is a newly-funded channel,
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* all three are same value. */
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our_msatoshi,
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our_msatoshi, /* msatoshi_to_us_min */
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our_msatoshi, /* msatoshi_to_us_max */
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remote_commit,
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remote_commit_sig,
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NULL, /* No HTLC sigs yet */
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channel_info,
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NULL, /* No remote_shutdown_scriptpubkey yet */
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final_key_idx, false,
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NULL, /* No commit sent yet */
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uc->first_blocknum,
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feerate, feerate,
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/* We are connected */
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true);
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/* Now we finally put it in the database. */
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wallet_channel_insert(ld->wallet, channel);
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return channel;
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}
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static void funding_broadcast_failed(struct channel *channel,
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int exitstatus, const char *err)
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{
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channel_internal_error(channel,
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"Funding broadcast exited with %i: %s",
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exitstatus, err);
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}
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void tell_gossipd_peer_is_important(struct lightningd *ld,
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const struct channel *channel)
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{
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u8 *msg;
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/* Tell gossipd we need to keep connection to this peer */
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msg = towire_gossipctl_peer_important(NULL, &channel->peer->id, true);
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subd_send_msg(ld->gossip, take(msg));
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}
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static void opening_funder_finished(struct subd *openingd, const u8 *resp,
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const int *fds,
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struct funding_channel *fc)
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{
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u8 *msg, *linear;
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struct channel_info channel_info;
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struct bitcoin_tx *fundingtx;
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struct bitcoin_txid funding_txid, expected_txid;
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struct pubkey changekey;
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struct pubkey local_fundingkey;
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struct crypto_state cs;
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secp256k1_ecdsa_signature remote_commit_sig;
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struct bitcoin_tx *remote_commit;
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u16 funding_outnum;
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u32 feerate;
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u64 change_satoshi;
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struct channel *channel;
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struct json_result *response;
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struct lightningd *ld = openingd->ld;
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struct channel_id cid;
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assert(tal_count(fds) == 2);
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/* This is a new channel_info.their_config so set its ID to 0 */
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channel_info.their_config.id = 0;
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if (!fromwire_opening_funder_reply(resp, resp,
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&channel_info.their_config,
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&remote_commit,
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&remote_commit_sig,
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&cs,
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&channel_info.theirbase.revocation,
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&channel_info.theirbase.payment,
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&channel_info.theirbase.htlc,
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&channel_info.theirbase.delayed_payment,
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&channel_info.remote_per_commit,
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&fc->uc->minimum_depth,
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&channel_info.remote_fundingkey,
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&expected_txid,
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&feerate)) {
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log_broken(fc->uc->log,
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"bad OPENING_FUNDER_REPLY %s",
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tal_hex(resp, resp));
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command_fail(fc->cmd, "bad OPENING_FUNDER_REPLY %s",
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tal_hex(fc->cmd, resp));
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goto failed;
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}
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log_debug(ld->log,
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"%s", type_to_string(tmpctx, struct pubkey,
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&channel_info.remote_per_commit));
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/* Generate the funding tx. */
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if (fc->wtx.change
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&& !bip32_pubkey(ld->wallet->bip32_base,
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&changekey, fc->wtx.change_key_index))
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fatal("Error deriving change key %u", fc->wtx.change_key_index);
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derive_basepoints(&fc->uc->seed, &local_fundingkey, NULL, NULL, NULL);
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fundingtx = funding_tx(tmpctx, &funding_outnum,
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fc->wtx.utxos, fc->wtx.amount,
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&local_fundingkey,
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&channel_info.remote_fundingkey,
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fc->wtx.change, &changekey,
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ld->wallet->bip32_base);
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log_debug(fc->uc->log, "Funding tx has %zi inputs, %zu outputs:",
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tal_count(fundingtx->input),
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tal_count(fundingtx->output));
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for (size_t i = 0; i < tal_count(fundingtx->input); i++) {
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log_debug(fc->uc->log, "%zi: %"PRIu64" satoshi (%s) %s\n",
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i, fc->wtx.utxos[i]->amount,
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fc->wtx.utxos[i]->is_p2sh ? "P2SH" : "SEGWIT",
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type_to_string(tmpctx, struct bitcoin_txid,
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&fundingtx->input[i].txid));
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}
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bitcoin_txid(fundingtx, &funding_txid);
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if (!structeq(&funding_txid, &expected_txid)) {
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log_broken(fc->uc->log,
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"Funding txid mismatch:"
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" satoshi %"PRIu64" change %"PRIu64
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" changeidx %u"
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" localkey %s remotekey %s",
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fc->wtx.amount,
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fc->wtx.change, fc->wtx.change_key_index,
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type_to_string(fc, struct pubkey,
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&local_fundingkey),
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type_to_string(fc, struct pubkey,
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&channel_info.remote_fundingkey));
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command_fail(fc->cmd,
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"Funding txid mismatch:"
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" satoshi %"PRIu64" change %"PRIu64
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" changeidx %u"
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" localkey %s remotekey %s",
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fc->wtx.amount,
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fc->wtx.change, fc->wtx.change_key_index,
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type_to_string(fc, struct pubkey,
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&local_fundingkey),
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type_to_string(fc, struct pubkey,
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&channel_info.remote_fundingkey));
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goto failed;
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}
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/* Steals fields from uc */
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channel = wallet_commit_channel(ld, fc->uc,
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remote_commit,
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&remote_commit_sig,
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&funding_txid,
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funding_outnum,
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fc->wtx.amount,
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fc->push_msat,
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fc->channel_flags,
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&channel_info,
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feerate);
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if (!channel) {
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command_fail(fc->cmd, "Key generation failure");
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goto failed;
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}
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/* Get HSM to sign the funding tx. */
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log_debug(channel->log, "Getting HSM to sign funding tx");
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msg = towire_hsm_sign_funding(tmpctx, channel->funding_satoshi,
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fc->wtx.change, fc->wtx.change_key_index,
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&local_fundingkey,
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&channel_info.remote_fundingkey,
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fc->wtx.utxos);
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if (!wire_sync_write(ld->hsm_fd, take(msg)))
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fatal("Could not write to HSM: %s", strerror(errno));
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msg = hsm_sync_read(fc, ld);
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if (!fromwire_hsm_sign_funding_reply(tmpctx, msg, &fundingtx))
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fatal("HSM gave bad sign_funding_reply %s",
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tal_hex(msg, resp));
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|
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/* Extract the change output and add it to the DB */
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wallet_extract_owned_outputs(ld->wallet, fundingtx, NULL, &change_satoshi);
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|
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/* Make sure we recognize our change output by its scriptpubkey in
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* future. This assumes that we have only two outputs, may not be true
|
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* if we add support for multifundchannel */
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if (tal_count(fundingtx->output) == 2)
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txfilter_add_scriptpubkey(ld->owned_txfilter, fundingtx->output[!funding_outnum].script);
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|
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/* Send it out and watch for confirms. */
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broadcast_tx(ld->topology, channel, fundingtx, funding_broadcast_failed);
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|
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channel_watch_funding(ld, channel);
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|
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tell_gossipd_peer_is_important(ld, channel);
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|
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/* Start normal channel daemon. */
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peer_start_channeld(channel, &cs, fds[0], fds[1], NULL, false);
|
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|
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wallet_confirm_utxos(ld->wallet, fc->wtx.utxos);
|
|
|
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response = new_json_result(fc->cmd);
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json_object_start(response, NULL);
|
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linear = linearize_tx(response, fundingtx);
|
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json_add_hex(response, "tx", linear, tal_len(linear));
|
|
json_add_txid(response, "txid", &channel->funding_txid);
|
|
derive_channel_id(&cid, &channel->funding_txid, funding_outnum);
|
|
json_add_string(response, "channel_id",
|
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type_to_string(tmpctx, struct channel_id, &cid));
|
|
json_object_end(response);
|
|
command_success(fc->cmd, response);
|
|
|
|
subd_release_channel(openingd, fc->uc);
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|
fc->uc->openingd = NULL;
|
|
|
|
/* Frees fc too, and tmpctx */
|
|
tal_free(fc->uc);
|
|
return;
|
|
|
|
failed:
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
subd_release_channel(openingd, fc->uc);
|
|
fc->uc->openingd = NULL;
|
|
/* Frees fc too, and tmpctx */
|
|
tal_free(fc->uc);
|
|
}
|
|
|
|
static void opening_fundee_finished(struct subd *openingd,
|
|
const u8 *reply,
|
|
const int *fds,
|
|
struct uncommitted_channel *uc)
|
|
{
|
|
u8 *funding_signed;
|
|
struct channel_info channel_info;
|
|
struct crypto_state cs;
|
|
secp256k1_ecdsa_signature remote_commit_sig;
|
|
struct bitcoin_tx *remote_commit;
|
|
struct lightningd *ld = openingd->ld;
|
|
struct bitcoin_txid funding_txid;
|
|
u16 funding_outnum;
|
|
u64 funding_satoshi, push_msat;
|
|
u32 feerate;
|
|
u8 channel_flags;
|
|
struct channel *channel;
|
|
|
|
log_debug(uc->log, "Got opening_fundee_finish_response");
|
|
assert(tal_count(fds) == 2);
|
|
|
|
/* This is a new channel_info.their_config, set its ID to 0 */
|
|
channel_info.their_config.id = 0;
|
|
|
|
if (!fromwire_opening_fundee_reply(tmpctx, reply,
|
|
&channel_info.their_config,
|
|
&remote_commit,
|
|
&remote_commit_sig,
|
|
&cs,
|
|
&channel_info.theirbase.revocation,
|
|
&channel_info.theirbase.payment,
|
|
&channel_info.theirbase.htlc,
|
|
&channel_info.theirbase.delayed_payment,
|
|
&channel_info.remote_per_commit,
|
|
&channel_info.remote_fundingkey,
|
|
&funding_txid,
|
|
&funding_outnum,
|
|
&funding_satoshi,
|
|
&push_msat,
|
|
&channel_flags,
|
|
&feerate,
|
|
&funding_signed)) {
|
|
log_broken(uc->log, "bad OPENING_FUNDEE_REPLY %s",
|
|
tal_hex(reply, reply));
|
|
tal_free(uc);
|
|
return;
|
|
}
|
|
|
|
/* Consumes uc */
|
|
channel = wallet_commit_channel(ld, uc,
|
|
remote_commit,
|
|
&remote_commit_sig,
|
|
&funding_txid,
|
|
funding_outnum,
|
|
funding_satoshi,
|
|
push_msat,
|
|
channel_flags,
|
|
&channel_info,
|
|
feerate);
|
|
if (!channel) {
|
|
tal_free(uc);
|
|
return;
|
|
}
|
|
|
|
log_debug(channel->log, "Watching funding tx %s",
|
|
type_to_string(reply, struct bitcoin_txid,
|
|
&channel->funding_txid));
|
|
|
|
channel_watch_funding(ld, channel);
|
|
|
|
tell_gossipd_peer_is_important(ld, channel);
|
|
|
|
/* On to normal operation! */
|
|
peer_start_channeld(channel, &cs,
|
|
fds[0], fds[1], funding_signed, false);
|
|
|
|
subd_release_channel(openingd, uc);
|
|
uc->openingd = NULL;
|
|
tal_free(uc);
|
|
}
|
|
|
|
static void opening_channel_errmsg(struct uncommitted_channel *uc,
|
|
int peer_fd, int gossip_fd,
|
|
const struct crypto_state *cs,
|
|
const struct channel_id *channel_id UNUSED,
|
|
const char *desc,
|
|
const u8 *err_for_them)
|
|
{
|
|
if (peer_fd == -1) {
|
|
u8 *msg = towire_gossipctl_peer_disconnected(tmpctx, &uc->peer->id);
|
|
log_info(uc->log, "%s", desc);
|
|
subd_send_msg(uc->peer->ld->gossip, msg);
|
|
if (uc->fc)
|
|
command_fail(uc->fc->cmd, "%s", desc);
|
|
} else {
|
|
/* An error occurred (presumably negotiation fail). */
|
|
const char *errsrc = err_for_them ? "sent" : "received";
|
|
|
|
uncommitted_channel_to_gossipd(uc->peer->ld, uc,
|
|
cs,
|
|
peer_fd, gossip_fd,
|
|
err_for_them,
|
|
"%s ERROR %s", errsrc, desc);
|
|
}
|
|
tal_free(uc);
|
|
}
|
|
|
|
/* There's nothing permanent in an unconfirmed transaction */
|
|
static void opening_channel_set_billboard(struct uncommitted_channel *uc,
|
|
bool perm UNUSED,
|
|
const char *happenings TAKES)
|
|
{
|
|
uc->transient_billboard = tal_free(uc->transient_billboard);
|
|
if (happenings)
|
|
uc->transient_billboard = tal_strdup(uc, happenings);
|
|
}
|
|
|
|
static void destroy_uncommitted_channel(struct uncommitted_channel *uc)
|
|
{
|
|
if (uc->openingd) {
|
|
struct subd *openingd = uc->openingd;
|
|
uc->openingd = NULL;
|
|
subd_release_channel(openingd, uc);
|
|
}
|
|
|
|
uc->peer->uncommitted_channel = NULL;
|
|
|
|
/* Last one out frees */
|
|
if (list_empty(&uc->peer->channels))
|
|
delete_peer(uc->peer);
|
|
}
|
|
|
|
/* Returns NULL if there's already an opening or active channel for this peer */
|
|
static struct uncommitted_channel *
|
|
new_uncommitted_channel(struct lightningd *ld,
|
|
struct funding_channel *fc,
|
|
const struct pubkey *peer_id,
|
|
const struct wireaddr_internal *addr)
|
|
{
|
|
struct uncommitted_channel *uc = tal(ld, struct uncommitted_channel);
|
|
char *idname;
|
|
|
|
/* We make a new peer if necessary. */
|
|
uc->peer = peer_by_id(ld, peer_id);
|
|
if (!uc->peer)
|
|
uc->peer = new_peer(ld, 0, peer_id, addr);
|
|
|
|
if (uc->peer->uncommitted_channel)
|
|
return tal_free(uc);
|
|
|
|
if (peer_active_channel(uc->peer))
|
|
return tal_free(uc);
|
|
|
|
uc->transient_billboard = NULL;
|
|
uc->dbid = wallet_get_channel_dbid(ld->wallet);
|
|
|
|
idname = type_to_string(uc, struct pubkey, &uc->peer->id);
|
|
uc->log = new_log(uc, uc->peer->log_book, "%s chan #%"PRIu64":",
|
|
idname, uc->dbid);
|
|
tal_free(idname);
|
|
|
|
uc->fc = fc;
|
|
uc->first_blocknum = get_block_height(ld->topology);
|
|
uc->our_config.id = 0;
|
|
|
|
derive_channel_seed(ld, &uc->seed, &uc->peer->id, uc->dbid);
|
|
uc->peer->uncommitted_channel = uc;
|
|
tal_add_destructor(uc, destroy_uncommitted_channel);
|
|
|
|
return uc;
|
|
}
|
|
|
|
static void channel_config(struct lightningd *ld,
|
|
struct channel_config *ours,
|
|
u32 *max_to_self_delay,
|
|
u32 *max_minimum_depth,
|
|
u64 *min_effective_htlc_capacity_msat)
|
|
{
|
|
/* FIXME: depend on feerate. */
|
|
*max_to_self_delay = ld->config.locktime_max;
|
|
*max_minimum_depth = ld->config.anchor_confirms_max;
|
|
/* This is 1c at $1000/BTC */
|
|
*min_effective_htlc_capacity_msat = 1000000;
|
|
|
|
/* BOLT #2:
|
|
*
|
|
* The sender SHOULD set `dust_limit_satoshis` to a sufficient
|
|
* value to allow commitment transactions to propagate through
|
|
* the Bitcoin network.
|
|
*/
|
|
ours->dust_limit_satoshis = 546;
|
|
ours->max_htlc_value_in_flight_msat = UINT64_MAX;
|
|
|
|
/* Don't care */
|
|
ours->htlc_minimum_msat = 0;
|
|
|
|
/* BOLT #2:
|
|
*
|
|
* The sender SHOULD set `to_self_delay` sufficient to ensure
|
|
* the sender can irreversibly spend a commitment transaction
|
|
* output in case of misbehavior by the receiver.
|
|
*/
|
|
ours->to_self_delay = ld->config.locktime_blocks;
|
|
|
|
/* BOLT #2:
|
|
*
|
|
* It MUST fail the channel if `max_accepted_htlcs` is greater than
|
|
* 483.
|
|
*/
|
|
ours->max_accepted_htlcs = 483;
|
|
|
|
/* This is filled in by lightning_openingd, for consistency. */
|
|
ours->channel_reserve_satoshis = 0;
|
|
};
|
|
|
|
/* Peer has spontaneously exited from gossip due to open msg. Return
|
|
* NULL if we took over, otherwise hand back to gossipd with this
|
|
* error.
|
|
*/
|
|
u8 *peer_accept_channel(const tal_t *ctx,
|
|
struct lightningd *ld,
|
|
const struct pubkey *peer_id,
|
|
const struct wireaddr_internal *addr,
|
|
const struct crypto_state *cs,
|
|
const u8 *gfeatures UNUSED, const u8 *lfeatures UNUSED,
|
|
int peer_fd, int gossip_fd,
|
|
const struct channel_id *channel_id,
|
|
const u8 *open_msg)
|
|
{
|
|
u32 max_to_self_delay, max_minimum_depth;
|
|
u64 min_effective_htlc_capacity_msat;
|
|
u8 *msg;
|
|
struct uncommitted_channel *uc;
|
|
|
|
assert(fromwire_peektype(open_msg) == WIRE_OPEN_CHANNEL);
|
|
|
|
/* Fails if there's already one */
|
|
uc = new_uncommitted_channel(ld, NULL, peer_id, addr);
|
|
if (!uc)
|
|
return towire_errorfmt(ctx, channel_id,
|
|
"Multiple channels unsupported");
|
|
|
|
uc->openingd = new_channel_subd(ld, "lightning_openingd", uc, uc->log,
|
|
true, opening_wire_type_name, NULL,
|
|
opening_channel_errmsg,
|
|
opening_channel_set_billboard,
|
|
take(&peer_fd), take(&gossip_fd),
|
|
NULL);
|
|
if (!uc->openingd) {
|
|
u8 *errpkt;
|
|
char *errmsg;
|
|
|
|
errmsg = tal_fmt(uc, "INTERNAL ERROR:"
|
|
" Failed to subdaemon opening: %s",
|
|
strerror(errno));
|
|
errpkt = towire_errorfmt(uc, channel_id, "%s", errmsg);
|
|
|
|
uncommitted_channel_to_gossipd(ld, uc,
|
|
cs,
|
|
peer_fd, gossip_fd,
|
|
errpkt, "%s", errmsg);
|
|
tal_free(uc);
|
|
return NULL;
|
|
}
|
|
|
|
/* BOLT #2:
|
|
*
|
|
* The sender SHOULD set `minimum_depth` to a number of blocks it
|
|
* considers reasonable to avoid double-spending of the funding
|
|
* transaction.
|
|
*/
|
|
uc->minimum_depth = ld->config.anchor_confirms;
|
|
|
|
channel_config(ld, &uc->our_config,
|
|
&max_to_self_delay, &max_minimum_depth,
|
|
&min_effective_htlc_capacity_msat);
|
|
|
|
msg = towire_opening_init(uc, get_chainparams(ld)->index,
|
|
&uc->our_config,
|
|
max_to_self_delay,
|
|
min_effective_htlc_capacity_msat,
|
|
cs, &uc->seed);
|
|
|
|
subd_send_msg(uc->openingd, take(msg));
|
|
|
|
msg = towire_opening_fundee(uc, uc->minimum_depth,
|
|
feerate_min(ld), feerate_max(ld),
|
|
open_msg);
|
|
|
|
subd_req(uc, uc->openingd, take(msg), -1, 2,
|
|
opening_fundee_finished, uc);
|
|
return NULL;
|
|
}
|
|
|
|
static void peer_offer_channel(struct lightningd *ld,
|
|
struct funding_channel *fc,
|
|
const struct wireaddr_internal *addr,
|
|
const struct crypto_state *cs,
|
|
const u8 *gfeatures UNUSED, const u8 *lfeatures UNUSED,
|
|
int peer_fd, int gossip_fd)
|
|
{
|
|
u8 *msg;
|
|
u32 max_to_self_delay, max_minimum_depth;
|
|
u64 min_effective_htlc_capacity_msat;
|
|
|
|
/* Remove from list, it's not pending any more. */
|
|
list_del_from(&ld->fundchannels, &fc->list);
|
|
tal_del_destructor(fc, remove_funding_channel_from_list);
|
|
|
|
fc->uc = new_uncommitted_channel(ld, fc, &fc->peerid, addr);
|
|
|
|
/* We asked to release this peer, but another raced in? Corner case,
|
|
* close this is easiest. */
|
|
if (!fc->uc) {
|
|
command_fail(fc->cmd, "Peer already active");
|
|
close(peer_fd);
|
|
close(gossip_fd);
|
|
return;
|
|
}
|
|
|
|
/* Channel now owns fc; if it dies, we free fc. */
|
|
tal_steal(fc->uc, fc);
|
|
|
|
fc->uc->openingd = new_channel_subd(ld,
|
|
"lightning_openingd",
|
|
fc->uc, fc->uc->log,
|
|
true, opening_wire_type_name, NULL,
|
|
opening_channel_errmsg,
|
|
opening_channel_set_billboard,
|
|
take(&peer_fd), take(&gossip_fd),
|
|
NULL);
|
|
if (!fc->uc->openingd) {
|
|
/* We don't send them an error packet: for them, nothing
|
|
* happened! */
|
|
uncommitted_channel_to_gossipd(ld, fc->uc, NULL,
|
|
peer_fd, gossip_fd,
|
|
NULL,
|
|
"Failed to launch openingd: %s",
|
|
strerror(errno));
|
|
tal_free(fc->uc);
|
|
return;
|
|
}
|
|
|
|
channel_config(ld, &fc->uc->our_config,
|
|
&max_to_self_delay, &max_minimum_depth,
|
|
&min_effective_htlc_capacity_msat);
|
|
|
|
msg = towire_opening_init(fc,
|
|
get_chainparams(ld)->index,
|
|
&fc->uc->our_config,
|
|
max_to_self_delay,
|
|
min_effective_htlc_capacity_msat,
|
|
cs, &fc->uc->seed);
|
|
subd_send_msg(fc->uc->openingd, take(msg));
|
|
|
|
msg = towire_opening_funder(fc, fc->wtx.amount,
|
|
fc->push_msat,
|
|
get_feerate(ld->topology, FEERATE_NORMAL),
|
|
max_minimum_depth,
|
|
fc->wtx.change, fc->wtx.change_key_index,
|
|
fc->channel_flags,
|
|
fc->wtx.utxos,
|
|
ld->wallet->bip32_base);
|
|
|
|
subd_req(fc, fc->uc->openingd,
|
|
take(msg), -1, 2, opening_funder_finished, fc);
|
|
}
|
|
|
|
/* Peer has been released from gossip. Start opening. */
|
|
static void gossip_peer_released(struct subd *gossip,
|
|
const u8 *resp,
|
|
const int *fds,
|
|
struct funding_channel *fc)
|
|
{
|
|
struct lightningd *ld = gossip->ld;
|
|
struct crypto_state cs;
|
|
u8 *gfeatures, *lfeatures;
|
|
struct wireaddr_internal addr;
|
|
struct channel *c;
|
|
struct uncommitted_channel *uc;
|
|
|
|
/* handle_opening_channel might have already taken care of this. */
|
|
if (fc->uc)
|
|
return;
|
|
|
|
c = active_channel_by_id(ld, &fc->peerid, &uc);
|
|
|
|
if (!fromwire_gossipctl_release_peer_reply(fc, resp, &addr, &cs,
|
|
&gfeatures, &lfeatures)) {
|
|
if (!fromwire_gossipctl_release_peer_replyfail(resp)) {
|
|
fatal("Gossip daemon gave invalid reply %s",
|
|
tal_hex(gossip, resp));
|
|
}
|
|
if (uc)
|
|
command_fail(fc->cmd, "Peer already OPENING");
|
|
else if (c)
|
|
command_fail(fc->cmd, "Peer already %s",
|
|
channel_state_name(c));
|
|
else
|
|
command_fail(fc->cmd, "Peer not connected");
|
|
return;
|
|
}
|
|
assert(tal_count(fds) == 2);
|
|
|
|
/* Gossipd should guarantee peer is unique: we would have killed any
|
|
* old connection when it was told us peer reconnected. */
|
|
assert(!c);
|
|
assert(!uc);
|
|
|
|
/* OK, offer peer a channel. */
|
|
peer_offer_channel(ld, fc, &addr, &cs,
|
|
gfeatures, lfeatures,
|
|
fds[0], fds[1]);
|
|
}
|
|
|
|
/* We can race: we're trying to get gossipd to release peer just as it
|
|
* reconnects. If that's happened, treat it as if it were
|
|
* released. */
|
|
bool handle_opening_channel(struct lightningd *ld,
|
|
const struct pubkey *id,
|
|
const struct wireaddr_internal *addr,
|
|
const struct crypto_state *cs,
|
|
const u8 *gfeatures, const u8 *lfeatures,
|
|
int peer_fd, int gossip_fd)
|
|
{
|
|
struct funding_channel *fc = find_funding_channel(ld, id);
|
|
|
|
if (!fc)
|
|
return false;
|
|
|
|
peer_offer_channel(ld, fc, addr, cs, gfeatures, lfeatures,
|
|
peer_fd, gossip_fd);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* json_fund_channel - Entrypoint for funding a channel
|
|
*/
|
|
static void json_fund_channel(struct command *cmd,
|
|
const char *buffer, const jsmntok_t *params)
|
|
{
|
|
jsmntok_t *desttok, *sattok;
|
|
struct funding_channel * fc = tal(cmd, struct funding_channel);
|
|
u32 feerate_per_kw = get_feerate(cmd->ld->topology, FEERATE_NORMAL);
|
|
u8 *msg;
|
|
|
|
fc->cmd = cmd;
|
|
fc->uc = NULL;
|
|
wtx_init(cmd, &fc->wtx);
|
|
if (!json_get_params(fc->cmd, buffer, params,
|
|
"id", &desttok,
|
|
"satoshi", &sattok, NULL))
|
|
return;
|
|
if (!json_tok_wtx(&fc->wtx, buffer, sattok))
|
|
return;
|
|
if (!pubkey_from_hexstr(buffer + desttok->start,
|
|
desttok->end - desttok->start,
|
|
&fc->peerid)) {
|
|
command_fail(cmd, "Could not parse id");
|
|
return;
|
|
}
|
|
|
|
/* FIXME: Support push_msat? */
|
|
fc->push_msat = 0;
|
|
fc->channel_flags = OUR_CHANNEL_FLAGS;
|
|
|
|
if (!wtx_select_utxos(&fc->wtx, feerate_per_kw,
|
|
BITCOIN_SCRIPTPUBKEY_P2WSH_LEN))
|
|
return;
|
|
|
|
if (fc->wtx.amount > MAX_FUNDING_SATOSHI) {
|
|
command_fail(cmd, "Funding satoshi must be <= %d",
|
|
MAX_FUNDING_SATOSHI);
|
|
return;
|
|
}
|
|
|
|
list_add(&cmd->ld->fundchannels, &fc->list);
|
|
tal_add_destructor(fc, remove_funding_channel_from_list);
|
|
|
|
msg = towire_gossipctl_release_peer(cmd, &fc->peerid);
|
|
subd_req(fc, cmd->ld->gossip, msg, -1, 2, gossip_peer_released, fc);
|
|
command_still_pending(cmd);
|
|
}
|
|
|
|
static const struct json_command fund_channel_command = {
|
|
"fundchannel",
|
|
json_fund_channel,
|
|
"Fund channel with {id} using {satoshi} (or 'all') satoshis"
|
|
};
|
|
AUTODATA(json_command, &fund_channel_command);
|
|
|