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lightningd/closing: subdaemon for closing negotiation.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
parent
d40334ce18
commit
e5a8a7502c
@ -2,6 +2,7 @@
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#define LIGHTNING_CLOSE_TX_H
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#include "config.h"
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#include "lightning.pb-c.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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struct sha256_double;
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@ -124,6 +124,7 @@ include lightningd/handshake/Makefile
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include lightningd/gossip/Makefile
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include lightningd/opening/Makefile
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include lightningd/channel/Makefile
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include lightningd/closing/Makefile
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$(LIGHTNINGD_OBJS) $(LIGHTNINGD_LIB_OBJS): $(LIGHTNINGD_HEADERS)
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59
lightningd/closing/Makefile
Normal file
59
lightningd/closing/Makefile
Normal file
@ -0,0 +1,59 @@
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#! /usr/bin/make
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# Designed to be run one level up
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lightningd/closing-wrongdir:
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$(MAKE) -C ../.. lightningd/closing-all
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default: lightningd/closing-all
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lightningd/closing-all: lightningd/lightningd_closing
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# lightningd/closing needs these:
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LIGHTNINGD_CLOSING_HEADERS_GEN := \
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lightningd/closing/gen_closing_wire.h
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LIGHTNINGD_CLOSING_HEADERS_NOGEN :=
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LIGHTNINGD_CLOSING_HEADERS := $(LIGHTNINGD_CLOSING_HEADERS_GEN) $(LIGHTNINGD_CLOSING_HEADERS_NOGEN)
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LIGHTNINGD_CLOSING_SRC := lightningd/closing/closing.c \
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$(LIGHTNINGD_CLOSING_HEADERS:.h=.c)
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LIGHTNINGD_CLOSING_OBJS := $(LIGHTNINGD_CLOSING_SRC:.c=.o)
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# Control daemon uses this:
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LIGHTNINGD_CLOSING_CONTROL_HEADERS := $(LIGHTNINGD_CLOSING_HEADERS)
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LIGHTNINGD_CLOSING_CONTROL_SRC := $(LIGHTNINGD_CLOSING_HEADERS:.h=.c)
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LIGHTNINGD_CLOSING_CONTROL_OBJS := $(LIGHTNINGD_CLOSING_CONTROL_SRC:.c=.o)
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LIGHTNINGD_CLOSING_GEN_SRC := $(filter lightningd/closing/gen_%, $(LIGHTNINGD_CLOSING_SRC) $(LIGHTNINGD_CLOSING_CONTROL_SRC))
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LIGHTNINGD_CLOSING_SRC_NOGEN := $(filter-out lightningd/closing/gen_%, $(LIGHTNINGD_CLOSING_SRC))
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# Add to headers which any object might need.
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LIGHTNINGD_HEADERS_GEN += $(LIGHTNINGD_CLOSING_HEADERS_GEN)
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LIGHTNINGD_HEADERS_NOGEN += $(LIGHTNINGD_CLOSING_HEADERS_NOGEN)
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$(LIGHTNINGD_CLOSING_OBJS): $(LIGHTNINGD_HEADERS)
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lightningd/closing/gen_closing_wire.h: $(WIRE_GEN) lightningd/closing/closing_wire.csv
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$(WIRE_GEN) --header $@ closing_wire_type < lightningd/closing/closing_wire.csv > $@
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lightningd/closing/gen_closing_wire.c: $(WIRE_GEN) lightningd/closing/closing_wire.csv
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$(WIRE_GEN) ${@:.c=.h} closing_wire_type < lightningd/closing/closing_wire.csv > $@
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LIGHTNINGD_CLOSING_OBJS := $(LIGHTNINGD_CLOSING_SRC:.c=.o) $(LIGHTNINGD_CLOSING_GEN_SRC:.c=.o)
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lightningd/lightningd_closing: $(LIGHTNINGD_OLD_LIB_OBJS) $(LIGHTNINGD_LIB_OBJS) $(LIGHTNINGD_CLOSING_OBJS) $(WIRE_ONION_OBJS) $(CORE_OBJS) $(CORE_TX_OBJS) $(WIRE_OBJS) $(BITCOIN_OBJS) $(CCAN_OBJS) $(CCAN_SHACHAIN48_OBJ) $(LIGHTNINGD_HSM_CLIENT_OBJS) $(LIBBASE58_OBJS) libsecp256k1.a libsodium.a libwallycore.a
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$(CC) $(CFLAGS) -o $@ $^ $(LDLIBS)
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check-source: $(LIGHTNINGD_CLOSING_SRC_NOGEN:%=check-src-include-order/%)
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check-source-bolt: $(LIGHTNINGD_CLOSING_SRC:%=bolt-check/%) $(LIGHTNINGD_CLOSING_HEADERS:%=bolt-check/%)
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check-whitespace: $(LIGHTNINGD_CLOSING_SRC_NOGEN:%=check-whitespace/%) $(LIGHTNINGD_CLOSING_HEADERS_NOGEN:%=check-whitespace/%)
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clean: lightningd/closing-clean
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lightningd/closing-clean:
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$(RM) $(LIGHTNINGD_CLOSING_OBJS) gen_*
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-include lightningd/closing/test/Makefile
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366
lightningd/closing/closing.c
Normal file
366
lightningd/closing/closing.c
Normal file
@ -0,0 +1,366 @@
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#include <bitcoin/script.h>
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#include <close_tx.h>
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#include <daemon/htlc.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <lightningd/closing/gen_closing_wire.h>
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#include <lightningd/crypto_sync.h>
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#include <lightningd/debug.h>
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#include <lightningd/derive_basepoints.h>
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#include <lightningd/status.h>
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#include <lightningd/subd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <type_to_string.h>
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#include <utils.h>
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#include <version.h>
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#include <wire/peer_wire.h>
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#include <wire/wire_sync.h>
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/* stdin == requests, 3 == peer, 4 = gossip */
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#define REQ_FD STDIN_FILENO
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#define PEER_FD 3
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#define GOSSIP_FD 4
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static struct bitcoin_tx *close_tx(const tal_t *ctx,
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u8 *scriptpubkey[NUM_SIDES],
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const struct sha256_double *funding_txid,
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unsigned int funding_txout,
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u64 funding_satoshi,
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const u64 satoshi_out[NUM_SIDES],
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enum side funder,
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uint64_t fee,
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uint64_t dust_limit)
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{
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struct bitcoin_tx *tx;
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if (satoshi_out[funder] < fee)
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status_failed(WIRE_CLOSING_NEGOTIATION_ERROR,
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"Funder cannot afford fee %"PRIu64
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" (%"PRIu64" and %"PRIu64")",
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fee, satoshi_out[LOCAL],
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satoshi_out[REMOTE]);
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tx = create_close_tx(ctx, scriptpubkey[LOCAL], scriptpubkey[REMOTE],
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funding_txid,
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funding_txout,
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funding_satoshi,
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satoshi_out[LOCAL] - (funder == LOCAL ? fee : 0),
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satoshi_out[REMOTE] - (funder == REMOTE ? fee : 0),
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dust_limit);
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if (!tx)
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status_failed(WIRE_CLOSING_NEGOTIATION_ERROR,
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"Both outputs below dust limit");
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return tx;
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}
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static u64 one_towards(u64 target, u64 value)
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{
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if (value > target)
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return value-1;
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else if (value < target)
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return value+1;
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return value;
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}
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int main(int argc, char *argv[])
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{
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struct crypto_state cs;
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const tal_t *ctx = tal_tmpctx(NULL);
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u8 *msg;
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struct privkey seed;
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struct pubkey funding_pubkey[NUM_SIDES];
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struct sha256_double funding_txid;
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u16 funding_txout;
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u64 funding_satoshi, satoshi_out[NUM_SIDES];
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u64 our_dust_limit;
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u64 minfee, maxfee, sent_fee;
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s64 last_received_fee = -1;
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enum side funder;
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u8 *scriptpubkey[NUM_SIDES], *funding_wscript;
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struct channel_id channel_id;
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struct secrets secrets;
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secp256k1_ecdsa_signature sig;
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if (argc == 2 && streq(argv[1], "--version")) {
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printf("%s\n", version());
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exit(0);
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}
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subdaemon_debug(argc, argv);
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/* We handle write returning errors! */
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signal(SIGCHLD, SIG_IGN);
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secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY
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| SECP256K1_CONTEXT_SIGN);
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status_setup_sync(REQ_FD);
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msg = wire_sync_read(ctx, REQ_FD);
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if (!fromwire_closing_init(ctx, msg, NULL,
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&cs, &seed,
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&funding_txid, &funding_txout,
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&funding_satoshi,
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&funding_pubkey[REMOTE],
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&funder,
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&satoshi_out[LOCAL],
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&satoshi_out[REMOTE],
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&our_dust_limit,
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&minfee, &maxfee, &sent_fee,
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&scriptpubkey[LOCAL],
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&scriptpubkey[REMOTE])) {
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status_failed(WIRE_CLOSING_PEER_BAD_MESSAGE,
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"Bad init message %s", tal_hex(ctx, msg));
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}
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derive_channel_id(&channel_id, &funding_txid, funding_txout);
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derive_basepoints(&seed, &funding_pubkey[LOCAL], NULL,
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&secrets, NULL);
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funding_wscript = bitcoin_redeem_2of2(ctx,
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&funding_pubkey[LOCAL],
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&funding_pubkey[REMOTE]);
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/* BOLT #2:
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*
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* Nodes SHOULD send a `closing_signed` message after `shutdown` has
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* been received and no HTLCs remain in either commitment transaction.
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*/
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/* BOLT #2:
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*
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* On reconnection, ... if the node has sent a previous
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* `closing_signed` it MUST then retransmit the last `closing_signed`.
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*/
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for (;;) {
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const tal_t *tmpctx = tal_tmpctx(ctx);
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struct bitcoin_tx *tx;
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u64 received_fee, limit_fee, new_fee;
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/* BOLT #2:
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*
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* The sender MUST set `signature` to the Bitcoin signature of
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* the close transaction with the node responsible for paying
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* the bitcoin fee paying `fee_satoshis`, then removing any
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* output which is below its own `dust_limit_satoshis`. The
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* sender MAY then also eliminate its own output from the
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* mutual close transaction.
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*/
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tx = close_tx(tmpctx, scriptpubkey,
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&funding_txid,
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funding_txout,
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funding_satoshi,
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satoshi_out, funder, sent_fee, our_dust_limit);
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if (!tx)
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status_failed(WIRE_CLOSING_NEGOTIATION_ERROR,
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"Both outputs below dust limit");
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/* BOLT #2:
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*
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* The sender MAY then also eliminate its own output from the
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* mutual close transaction.
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*/
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/* (We don't do this). */
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sign_tx_input(tx, 0, NULL, funding_wscript,
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&secrets.funding_privkey,
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&funding_pubkey[LOCAL],
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&sig);
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/* Tell master we're making an offer, wait for db commit. */
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msg = towire_closing_offered_signature(tmpctx, sent_fee, &sig);
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if (!wire_sync_write(REQ_FD, msg))
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status_failed(WIRE_CLOSING_INTERNAL_ERROR,
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"Writing offer to master failed: %s",
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strerror(errno));
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msg = wire_sync_read(tmpctx, REQ_FD);
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if (!fromwire_closing_offered_signature_reply(msg, NULL))
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status_failed(WIRE_CLOSING_INTERNAL_ERROR,
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"Reading offer reply from master failed");
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status_trace("sending fee offer %"PRIu64, sent_fee);
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/* Now send closing offer */
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msg = towire_closing_signed(tmpctx, &channel_id, sent_fee, &sig);
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if (!sync_crypto_write(&cs, PEER_FD, take(msg)))
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status_failed(WIRE_CLOSING_PEER_WRITE_FAILED,
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"Writing closing_signed");
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/* Did we just agree with them? If so, we're done. */
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if (sent_fee == last_received_fee)
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break;
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again:
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msg = sync_crypto_read(tmpctx, &cs, PEER_FD);
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if (!msg)
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status_failed(WIRE_CLOSING_PEER_READ_FAILED,
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"Reading input");
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/* We don't send gossip at this stage, but we can recv it */
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if (is_gossip_msg(msg)) {
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if (!wire_sync_write(GOSSIP_FD, take(msg)))
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status_failed(WIRE_CLOSING_GOSSIP_FAILED,
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"Writing gossip");
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goto again;
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}
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/* BOLT #2:
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*
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* On reconnection, a node MUST ignore a redundant
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* `funding_locked` if it receives one.
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*/
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/* This should only happen if we've made no commitments, but
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* we don't have to check that: it's their problem. */
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if (fromwire_peektype(msg) == WIRE_FUNDING_LOCKED) {
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tal_free(msg);
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goto again;
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}
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if (!fromwire_closing_signed(msg, NULL, &channel_id,
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&received_fee, &sig))
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status_failed(WIRE_CLOSING_PEER_BAD_MESSAGE,
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"Expected closing_signed: %s",
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tal_hex(trc, msg));
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/* BOLT #2:
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*
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* The receiver MUST check `signature` is valid for either the
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* close transaction with the given `fee_satoshis` as detailed
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* above and its own `dust_limit_satoshis` OR that same
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* transaction with the sender's output eliminated, and MUST
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* fail the connection if it is not.
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*/
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tx = close_tx(tmpctx, scriptpubkey,
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&funding_txid,
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funding_txout,
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funding_satoshi,
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satoshi_out, funder, received_fee, our_dust_limit);
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if (!check_tx_sig(tx, 0, NULL, funding_wscript,
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&funding_pubkey[REMOTE], &sig)) {
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/* Trim it by reducing their output to minimum */
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struct bitcoin_tx *trimmed;
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u64 trimming_satoshi_out[NUM_SIDES];
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if (funder == REMOTE)
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trimming_satoshi_out[REMOTE] = received_fee;
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else
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trimming_satoshi_out[REMOTE] = 0;
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trimming_satoshi_out[LOCAL] = satoshi_out[LOCAL];
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trimmed = close_tx(tmpctx, scriptpubkey,
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&funding_txid,
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funding_txout,
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funding_satoshi,
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trimming_satoshi_out,
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funder, received_fee, our_dust_limit);
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if (!trimmed
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|| !check_tx_sig(trimmed, 0, NULL, funding_wscript,
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&funding_pubkey[REMOTE], &sig)) {
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status_failed(WIRE_CLOSING_PEER_BAD_MESSAGE,
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"Bad closing_signed signature for"
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" %s (and trimmed version %s)",
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type_to_string(tmpctx,
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struct bitcoin_tx,
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tx),
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trimmed ?
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type_to_string(tmpctx,
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struct bitcoin_tx,
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trimmed)
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: "NONE");
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}
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}
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status_trace("Received fee offer %"PRIu64, received_fee);
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/* Is fee reasonable? Tell master. */
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if (received_fee < minfee) {
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status_trace("Fee too low, below %"PRIu64, minfee);
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limit_fee = minfee;
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} else if (received_fee > maxfee) {
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status_trace("Fee too high, above %"PRIu64, maxfee);
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limit_fee = maxfee;
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} else {
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status_trace("Fee accepted.");
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msg = towire_closing_received_signature(tmpctx,
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received_fee,
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&sig);
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if (!wire_sync_write(REQ_FD, take(msg)))
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status_failed(WIRE_CLOSING_INTERNAL_ERROR,
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"Writing received to master: %s",
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strerror(errno));
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msg = wire_sync_read(tmpctx, REQ_FD);
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if (!fromwire_closing_received_signature_reply(msg,NULL))
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status_failed(WIRE_CLOSING_INTERNAL_ERROR,
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"Bad received reply from master");
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limit_fee = received_fee;
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}
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/* BOLT #2:
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*
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* Once a node has sent or received a `closing_signed` with
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* matching `fee_satoshis` it SHOULD close the connection and
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* SHOULD sign and broadcast the final closing transaction.
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*/
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if (received_fee == sent_fee)
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break;
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/* Check that they moved in right direction. Not really
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* a requirement that we check, but good to catch their bugs. */
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if (last_received_fee != -1) {
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bool previous_dir = sent_fee < last_received_fee;
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bool dir = received_fee < last_received_fee;
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bool next_dir = sent_fee < received_fee;
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/* They went away from our offer? */
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if (dir != previous_dir)
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status_failed(WIRE_CLOSING_NEGOTIATION_ERROR,
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"Their fee went %"
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PRIu64" to %"PRIu64
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" when ours was %"PRIu64,
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last_received_fee,
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received_fee,
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sent_fee);
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/* They jumped over our offer? */
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if (next_dir != previous_dir)
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status_failed(WIRE_CLOSING_NEGOTIATION_ERROR,
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"Their fee jumped %"
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PRIu64" to %"PRIu64
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" when ours was %"PRIu64,
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last_received_fee,
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received_fee,
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sent_fee);
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}
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/* BOLT #2:
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*
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* ...otherwise it SHOULD propose a value strictly between the
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* received `fee_satoshis` and its previously-sent
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* `fee_satoshis`.
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*/
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/* We do it by bisection, with twists:
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* 1. Don't go outside limits, or reach them immediately:
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* treat out-of-limit offers as on-limit offers.
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* 2. Round towards the target, otherwise we can't close
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* a final 1-satoshi gap.
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*
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* Note: Overflow impossible here, since fee <= funder amount */
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new_fee = one_towards(limit_fee, limit_fee + sent_fee) / 2;
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||||
|
||||
/* If we didn't move, give up (we're ~ at min/max). */
|
||||
if (new_fee == sent_fee)
|
||||
status_failed(WIRE_CLOSING_NEGOTIATION_ERROR,
|
||||
"Final fee %"PRIu64" vs %"PRIu64
|
||||
" at limits %"PRIu64"-%"PRIu64,
|
||||
sent_fee, received_fee,
|
||||
minfee, maxfee);
|
||||
|
||||
last_received_fee = received_fee;
|
||||
sent_fee = new_fee;
|
||||
tal_free(tmpctx);
|
||||
}
|
||||
|
||||
/* We're done! */
|
||||
wire_sync_write(REQ_FD, take(towire_closing_complete(ctx)));
|
||||
tal_free(ctx);
|
||||
|
||||
return 0;
|
||||
}
|
||||
54
lightningd/closing/closing_wire.csv
Normal file
54
lightningd/closing/closing_wire.csv
Normal file
@ -0,0 +1,54 @@
|
||||
# Shouldn't happen
|
||||
closing_bad_command,0x8000
|
||||
# Also shouldn't happen
|
||||
closing_gossip_failed,0x8001
|
||||
closing_internal_error,0x8003
|
||||
|
||||
# These are due to peer.
|
||||
closing_peer_write_failed,0x8010
|
||||
closing_peer_read_failed,0x8011
|
||||
closing_peer_bad_message,0x8012
|
||||
closing_peer_bad_message,,len,u16
|
||||
closing_peer_bad_message,,msg,len*u8
|
||||
closing_negotiation_error,0x8013
|
||||
closing_negotiation_error,,len,u16
|
||||
closing_negotiation_error,,msg,len*u8
|
||||
|
||||
#include <lightningd/cryptomsg.h>
|
||||
#include <lightningd/htlc_wire.h>
|
||||
# Begin! (passes peer fd, gossipd-client fd)
|
||||
closing_init,1
|
||||
closing_init,,crypto_state,struct crypto_state
|
||||
closing_init,,seed,struct privkey
|
||||
closing_init,,funding_txid,struct sha256_double
|
||||
closing_init,,funding_txout,u16
|
||||
closing_init,,funding_satoshi,u64
|
||||
closing_init,,remote_fundingkey,struct pubkey
|
||||
closing_init,,funder,enum side
|
||||
closing_init,,local_msatoshi,u64
|
||||
closing_init,,remote_msatoshi,u64
|
||||
closing_init,,our_dust_limit,u64
|
||||
closing_init,,min_fee_satoshi,u64
|
||||
closing_init,,max_fee_satoshi,u64
|
||||
closing_init,,initial_fee_satoshi,u64
|
||||
closing_init,,local_scriptpubkey_len,u16
|
||||
closing_init,,local_scriptpubkey,local_scriptpubkey_len*u8
|
||||
closing_init,,remote_scriptpubkey_len,u16
|
||||
closing_init,,remote_scriptpubkey,remote_scriptpubkey_len*u8
|
||||
|
||||
# We received an offer, save signature.
|
||||
closing_received_signature,2
|
||||
closing_received_signature,,fee_satoshi,u64
|
||||
closing_received_signature,,signature,secp256k1_ecdsa_signature
|
||||
|
||||
closing_received_signature_reply,102
|
||||
|
||||
# We sent an offer, save it in case we crash.
|
||||
closing_offered_signature,3
|
||||
closing_offered_signature,,fee_satoshi,u64
|
||||
closing_offered_signature,,signature,secp256k1_ecdsa_signature
|
||||
|
||||
closing_offered_signature_reply,103
|
||||
|
||||
# Negotiations complete, we're exiting.
|
||||
closing_complete,4
|
||||
|
Loading…
Reference in New Issue
Block a user