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core-lightning/devtools/mkcommit.c
Christian Decker 9288a7906b tx: Add chainparams to struct bitcoin_tx as context 
The way we build transactions, serialize them, and compute fees depends on the
chain we are working on, so let's add some context to the transactions.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
2019-07-31 23:22:54 +00:00

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/* Code to make a commitment tx, useful for generating test cases.
*
* For example, in the spec tests we use the following:
*
* lightning/devtools/mkcommit 0 41085b995c1f591cfc3ae79ccde012bf0b37c7bde23d80a61c9732bdd6210b2f 0 999878sat 253 999878sat local \
5 546 9900sat \
6 546 9900sat \
0000000000000000000000000000000000000000000000000000000000000020 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000021 0000000000000000000000000000000000000000000000000000000000000022 0000000000000000000000000000000000000000000000000000000000000023 0000000000000000000000000000000000000000000000000000000000000024 \
0000000000000000000000000000000000000000000000000000000000000010 FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF 0000000000000000000000000000000000000000000000000000000000000011 0000000000000000000000000000000000000000000000000000000000000012 0000000000000000000000000000000000000000000000000000000000000013 0000000000000000000000000000000000000000000000000000000000000014
*/
#include <bitcoin/script.h>
#include <bitcoin/tx.h>
#include <ccan/err/err.h>
#include <ccan/str/hex/hex.h>
#include <channeld/full_channel.h>
#include <common/amount.h>
#include <common/derive_basepoints.h>
#include <common/htlc_wire.h>
#include <common/key_derive.h>
#include <common/keyset.h>
#include <common/status.h>
#include <common/type_to_string.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdio.h>
static bool verbose = false;
void status_fmt(enum log_level level, const char *fmt, ...)
{
if (verbose) {
va_list ap;
va_start(ap, fmt);
printf("#TRACE: ");
vprintf(fmt, ap);
printf("\n");
va_end(ap);
}
}
void status_failed(enum status_failreason reason, const char *fmt, ...)
{
abort();
}
static int parse_secrets(char *argv[],
struct secrets *secrets,
struct sha256 *seed,
const char *desc)
{
int argnum = 0;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
&secrets->funding_privkey,
sizeof(secrets->funding_privkey)))
errx(1, "Parsing %s.funding_privkey", desc);
argnum++;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
seed, sizeof(*seed)))
errx(1, "Parsing %s seed", desc);
argnum++;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
&secrets->revocation_basepoint_secret,
sizeof(secrets->revocation_basepoint_secret)))
errx(1, "Parsing %s.revocation_basepoint_secret", desc);
argnum++;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
&secrets->payment_basepoint_secret,
sizeof(secrets->payment_basepoint_secret)))
errx(1, "Parsing %s.payment_basepoint_secret", desc);
argnum++;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
&secrets->delayed_payment_basepoint_secret,
sizeof(secrets->delayed_payment_basepoint_secret)))
errx(1, "Parsing %s.delayed_payment_basepoint_secret", desc);
argnum++;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
&secrets->htlc_basepoint_secret,
sizeof(secrets->htlc_basepoint_secret)))
errx(1, "Parsing %s.htlc_basepoint_secret", desc);
argnum++;
return argnum;
}
static void print_basepoints(const char *desc,
const struct secrets *secrets,
const struct sha256 *shaseed,
const struct basepoints *basepoints,
const struct pubkey *fundingkey,
u64 commitnum)
{
struct secret per_commitment_secret;
struct pubkey per_commitment_point;
printf("## %s\n", desc);
printf("# funding_privkey=%s\n",
type_to_string(NULL, struct secret, &secrets->funding_privkey.secret));
printf("funding_pubkey=%s\n",
type_to_string(NULL, struct pubkey, fundingkey));
printf("# revocation_basepoint_secret=%s\n",
type_to_string(NULL, struct secret,
&secrets->revocation_basepoint_secret));
printf("revocation_basepoint=%s\n",
type_to_string(NULL, struct pubkey, &basepoints->revocation));
printf("# payment_basepoint_secret=%s\n",
type_to_string(NULL, struct secret,
&secrets->payment_basepoint_secret));
printf("payment_basepoint=%s\n",
type_to_string(NULL, struct pubkey, &basepoints->payment));
printf("# delayed_payment_basepoint_secret=%s\n",
type_to_string(NULL, struct secret,
&secrets->delayed_payment_basepoint_secret));
printf("delayed_payment_basepoint=%s\n",
type_to_string(NULL, struct pubkey, &basepoints->delayed_payment));
printf("# htlc_basepoint_secret=%s\n",
type_to_string(NULL, struct secret,
&secrets->htlc_basepoint_secret));
printf("htlc_basepoint=%s\n",
type_to_string(NULL, struct pubkey, &basepoints->htlc));
if (!per_commit_secret(shaseed, &per_commitment_secret, commitnum))
errx(1, "Bad deriving %s per_commitment_secret #%"PRIu64,
desc, commitnum);
if (!per_commit_point(shaseed, &per_commitment_point, commitnum))
errx(1, "Bad deriving %s per_commitment_point #%"PRIu64,
desc, commitnum);
printf("# shachain seed=%s\n",
type_to_string(NULL, struct sha256, shaseed));
printf("# per_commitment_secret %"PRIu64"=%s\n",
commitnum,
type_to_string(NULL, struct secret, &per_commitment_secret));
printf("per_commitment_point %"PRIu64"=%s\n\n",
commitnum,
type_to_string(NULL, struct pubkey, &per_commitment_point));
}
static int parse_config(char *argv[],
struct channel_config *config,
const char *desc)
{
int argnum = 0;
config->id = 0;
/* FIXME: Allow overriding these on cmdline! */
config->max_htlc_value_in_flight = AMOUNT_MSAT(-1ULL);
config->htlc_minimum = AMOUNT_MSAT(0);
config->max_accepted_htlcs = 483;
config->to_self_delay = atoi(argv[argnum]);
argnum++;
if (!parse_amount_sat(&config->dust_limit,
argv[argnum], strlen(argv[argnum])))
errx(1, "Bad %s dustlimit", desc);
argnum++;
if (!parse_amount_sat(&config->channel_reserve,
argv[argnum], strlen(argv[argnum])))
errx(1, "Bad %s reserve", desc);
argnum++;
return argnum;
}
static char *sig_as_hex(const struct bitcoin_signature *sig)
{
u8 compact_sig[64];
secp256k1_ecdsa_signature_serialize_compact(secp256k1_ctx,
compact_sig,
&sig->s);
return tal_hexstr(NULL, compact_sig, sizeof(compact_sig));
}
static int parse_htlc(char *argv[],
struct added_htlc **htlcs,
enum htlc_state **htlc_states,
struct preimage **preimages)
{
struct added_htlc add;
int argnum = 0;
struct preimage preimage;
add.id = tal_count(*htlcs);
if (streq(argv[argnum], "local"))
tal_arr_expand(htlc_states, SENT_ADD_ACK_REVOCATION);
else if (streq(argv[argnum], "remote"))
tal_arr_expand(htlc_states, RCVD_ADD_ACK_REVOCATION);
else
errx(1, "Bad htlc offer: %s should be 'local' or 'remote'",
argv[argnum]);
argnum++;
if (!hex_decode(argv[argnum], strlen(argv[argnum]),
&preimage, sizeof(preimage)))
errx(1, "Bad payment-preimage %s", argv[argnum]);
tal_arr_expand(preimages, preimage);
sha256(&add.payment_hash, &preimage, sizeof(preimage));
argnum++;
if (!parse_amount_msat(&add.amount,
argv[argnum], strlen(argv[argnum])))
errx(1, "Bad htlc amount %s", argv[argnum]);
argnum++;
add.cltv_expiry = atoi(argv[argnum]);
argnum++;
printf("# HTLC %"PRIu64": %s amount=%s preimage=%s payment_hash=%s cltv=%u\n",
add.id, argv[0],
type_to_string(tmpctx, struct amount_msat, &add.amount),
type_to_string(tmpctx, struct preimage, &preimage),
type_to_string(tmpctx, struct sha256, &add.payment_hash),
add.cltv_expiry);
tal_arr_expand(htlcs, add);
return argnum;
}
static const struct preimage *preimage_of(const struct sha256 *hash,
const struct added_htlc *htlcs,
const struct preimage *preimages)
{
for (size_t i = 0; i < tal_count(preimages); i++)
if (sha256_eq(hash, &htlcs[i].payment_hash))
return preimages + i;
abort();
}
int main(int argc, char *argv[])
{
struct secrets local, remote;
struct sha256 localseed, remoteseed;
struct basepoints localbase, remotebase;
struct pubkey funding_localkey, funding_remotekey;
u64 commitnum;
struct amount_sat funding_amount;
struct bitcoin_txid funding_txid;
unsigned int funding_outnum;
u32 feerate_per_kw[NUM_SIDES];
struct pubkey local_per_commit_point, remote_per_commit_point;
struct bitcoin_signature local_sig, remote_sig;
struct channel_config localconfig, remoteconfig;
struct amount_msat local_msat, remote_msat;
int argnum;
struct bitcoin_tx **local_txs, **remote_txs;
enum side fee_payer;
u8 **witness;
const u8 **wscripts;
struct channel *channel;
struct added_htlc *htlcs = tal_arr(NULL, struct added_htlc, 0);
enum htlc_state *hstates = tal_arr(NULL, enum htlc_state, 0);
struct preimage *preimages = tal_arr(NULL, struct preimage, 0);
const struct htlc **htlcmap;
struct privkey local_htlc_privkey, remote_htlc_privkey;
struct pubkey local_htlc_pubkey, remote_htlc_pubkey;
const struct chainparams *chainparams = chainparams_for_network("bitcoin");
setup_locale();
secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY |
SECP256K1_CONTEXT_SIGN);
if (argv[1] && streq(argv[1], "-v")) {
verbose = true;
argv++;
argc--;
}
if (argc < 1 + 7 + 3*2 + 6*2)
errx(1, "Usage: mkcommit [-v] <commitnum> <funding-txid> <funding-txout> <funding-amount> <feerate-per-kw> <local-msat> <fee-payer> <localconfig> <remoteconfig> <remote-reserve> <localsecrets> <remotesecrets> [<htlc>...]\n"
"Where <config> are:\n"
" <to-self-delay>\n"
" <dustlimit>\n"
" <reserve-sat>\n"
"Where <secrets> are:\n"
" <funding-privkey>\n"
" <shachain-seed>\n"
" <revocation-base-secret>\n"
" <payment-base-secret>\n"
" <delayed-payment-base-secret>\n"
" <htlc-base-secret>\n"
"Where <htlc>s are:\n"
" <offer-side>\n"
" <payment-preimage>\n"
" <amount-msat>\n"
" <cltv-expiry>\n");
argnum = 1;
commitnum = atol(argv[argnum++]);
if (!bitcoin_txid_from_hex(argv[argnum],
strlen(argv[argnum]), &funding_txid))
errx(1, "Bad funding-txid");
argnum++;
funding_outnum = atoi(argv[argnum++]);
if (!parse_amount_sat(&funding_amount, argv[argnum], strlen(argv[argnum])))
errx(1, "Bad funding-amount");
argnum++;
feerate_per_kw[LOCAL] = feerate_per_kw[REMOTE] = atoi(argv[argnum++]);
if (!parse_amount_msat(&local_msat,
argv[argnum], strlen(argv[argnum])))
errx(1, "Bad local-msat");
argnum++;
if (streq(argv[argnum], "local"))
fee_payer = LOCAL;
else if (streq(argv[argnum], "remote"))
fee_payer = REMOTE;
else
errx(1, "fee-payer must be 'local' or 'remote'");
argnum++;
argnum += parse_config(argv + argnum, &localconfig, "local");
argnum += parse_config(argv + argnum, &remoteconfig, "remote");
argnum += parse_secrets(argv + argnum, &local, &localseed, "local");
argnum += parse_secrets(argv + argnum, &remote, &remoteseed, "remote");
if (!amount_sat_sub_msat(&remote_msat, funding_amount, local_msat))
errx(1, "Can't afford local_msat");
printf("## HTLCs\n");
while (argnum < argc)
argnum += parse_htlc(argv + argnum, &htlcs, &hstates, &preimages);
printf("\n");
if (!pubkey_from_privkey(&local.funding_privkey, &funding_localkey)
|| !pubkey_from_secret(&local.revocation_basepoint_secret,
&localbase.revocation)
|| !pubkey_from_secret(&local.payment_basepoint_secret,
&localbase.payment)
|| !pubkey_from_secret(&local.delayed_payment_basepoint_secret,
&localbase.delayed_payment)
|| !pubkey_from_secret(&local.htlc_basepoint_secret,
&localbase.htlc))
errx(1, "Bad deriving local basepoints");
if (!pubkey_from_privkey(&remote.funding_privkey, &funding_remotekey)
|| !pubkey_from_secret(&remote.revocation_basepoint_secret,
&remotebase.revocation)
|| !pubkey_from_secret(&remote.payment_basepoint_secret,
&remotebase.payment)
|| !pubkey_from_secret(&remote.delayed_payment_basepoint_secret,
&remotebase.delayed_payment)
|| !pubkey_from_secret(&remote.htlc_basepoint_secret,
&remotebase.htlc))
errx(1, "Bad deriving remote basepoints");
print_basepoints("local",
&local, &localseed,
&localbase, &funding_localkey, commitnum);
print_basepoints("remote",
&remote, &remoteseed,
&remotebase, &funding_remotekey, commitnum);
channel = new_full_channel(NULL,
&chainparams_for_network("regtest")
->genesis_blockhash,
&funding_txid, funding_outnum, 1,
funding_amount,
local_msat,
feerate_per_kw,
&localconfig, &remoteconfig,
&localbase, &remotebase,
&funding_localkey, &funding_remotekey,
fee_payer);
if (!channel_force_htlcs(channel, htlcs, hstates, NULL, NULL, NULL, NULL))
errx(1, "Cannot add HTLCs");
u8 *funding_wscript = bitcoin_redeem_2of2(NULL,
&funding_localkey,
&funding_remotekey);
/* Create the local commitment_tx */
if (!per_commit_point(&localseed, &local_per_commit_point, commitnum))
errx(1, "Bad deriving local per-commitment-point");
local_txs = channel_txs(chainparams, NULL, &htlcmap, &wscripts, channel,
&local_per_commit_point, commitnum, LOCAL);
printf("## local_commitment\n"
"# input amount %s, funding_wscript %s, key %s\n",
type_to_string(NULL, struct amount_sat, &funding_amount),
tal_hex(NULL, funding_wscript),
type_to_string(NULL, struct pubkey, &funding_localkey));
printf("# unsigned local commitment tx: %s\n",
tal_hex(NULL, linearize_tx(NULL, local_txs[0])));
sign_tx_input(local_txs[0], 0, NULL, funding_wscript,
&local.funding_privkey,
&funding_localkey,
SIGHASH_ALL,
&local_sig);
printf("localsig_on_local: %s\n", sig_as_hex(&local_sig));
sign_tx_input(local_txs[0], 0, NULL, funding_wscript,
&remote.funding_privkey,
&funding_remotekey,
SIGHASH_ALL,
&remote_sig);
printf("remotesig_on_local: %s\n", sig_as_hex(&remote_sig));
witness =
bitcoin_witness_2of2(NULL, &local_sig, &remote_sig,
&funding_localkey, &funding_remotekey);
bitcoin_tx_input_set_witness(local_txs[0], 0, witness);
printf("# signed local commitment: %s\n",
tal_hex(NULL, linearize_tx(NULL, local_txs[0])));
if (!derive_simple_privkey(&local.htlc_basepoint_secret,
&localbase.htlc,
&local_per_commit_point,
&local_htlc_privkey))
errx(1, "Failure deriving local htlc privkey");
if (!derive_simple_key(&localbase.htlc,
&local_per_commit_point,
&local_htlc_pubkey))
errx(1, "Failure deriving local htlc pubkey");
if (!derive_simple_privkey(&remote.htlc_basepoint_secret,
&remotebase.htlc,
&local_per_commit_point,
&remote_htlc_privkey))
errx(1, "Failure deriving remote htlc privkey");
if (!derive_simple_key(&remotebase.htlc,
&local_per_commit_point,
&remote_htlc_pubkey))
errx(1, "Failure deriving remote htlc pubkey");
for (size_t i = 0; i < tal_count(htlcmap); i++) {
struct bitcoin_signature local_htlc_sig, remote_htlc_sig;
struct amount_sat amt;
if (!htlcmap[i])
continue;
printf("# Output %zu: %s HTLC %"PRIu64"\n",
i, side_to_str(htlc_owner(htlcmap[i])), htlcmap[i]->id);
printf("# unsigned htlc tx for output %zu: %s\n",
i, tal_hex(NULL, linearize_tx(NULL, local_txs[1+i])));
amt = amount_msat_to_sat_round_down(htlcmap[i]->amount);
local_txs[1+i]->input_amounts[0]
= tal_dup(local_txs[1+i], struct amount_sat, &amt);
printf("# wscript: %s\n", tal_hex(NULL, wscripts[1+i]));
sign_tx_input(local_txs[1+i], 0, NULL, wscripts[1+i],
&local_htlc_privkey, &local_htlc_pubkey,
SIGHASH_ALL, &local_htlc_sig);
sign_tx_input(local_txs[1+i], 0, NULL, wscripts[1+i],
&remote_htlc_privkey, &remote_htlc_pubkey,
SIGHASH_ALL, &remote_htlc_sig);
printf("localsig_on_local output %zu: %s\n",
i, sig_as_hex(&local_htlc_sig));
printf("remotesig_on_local output %zu: %s\n",
i, sig_as_hex(&remote_htlc_sig));
if (htlc_owner(htlcmap[i]) == LOCAL)
witness = bitcoin_witness_htlc_timeout_tx(NULL,
&local_htlc_sig,
&remote_htlc_sig,
wscripts[1+i]);
else
witness = bitcoin_witness_htlc_success_tx(NULL,
&local_htlc_sig,
&remote_htlc_sig,
preimage_of(&htlcmap[i]->rhash, htlcs, preimages),
wscripts[1+i]);
bitcoin_tx_input_set_witness(local_txs[1+i], 0, witness);
printf("htlc tx for output %zu: %s\n",
i, tal_hex(NULL, linearize_tx(NULL, local_txs[1+i])));
}
printf("\n");
/* Create the remote commitment tx */
if (!per_commit_point(&remoteseed, &remote_per_commit_point, commitnum))
errx(1, "Bad deriving remote per-commitment-point");
remote_txs = channel_txs(chainparams, NULL, &htlcmap, &wscripts, channel,
&remote_per_commit_point, commitnum, REMOTE);
remote_txs[0]->input_amounts[0]
= tal_dup(remote_txs[0], struct amount_sat, &funding_amount);
printf("## remote_commitment\n"
"# input amount %s, funding_wscript %s, key %s\n",
type_to_string(NULL, struct amount_sat, &funding_amount),
tal_hex(NULL, funding_wscript),
type_to_string(NULL, struct pubkey, &funding_remotekey));
printf("# unsigned remote commitment tx: %s\n",
tal_hex(NULL, linearize_tx(NULL, remote_txs[0])));
sign_tx_input(remote_txs[0], 0, NULL, funding_wscript,
&local.funding_privkey,
&funding_localkey,
SIGHASH_ALL,
&local_sig);
printf("localsig_on_remote: %s\n", sig_as_hex(&local_sig));
sign_tx_input(remote_txs[0], 0, NULL, funding_wscript,
&remote.funding_privkey,
&funding_remotekey,
SIGHASH_ALL,
&remote_sig);
printf("remotesig_on_remote: %s\n", sig_as_hex(&remote_sig));
witness =
bitcoin_witness_2of2(NULL, &local_sig, &remote_sig,
&funding_localkey, &funding_remotekey);
bitcoin_tx_input_set_witness(remote_txs[0], 0, witness);
printf("# signed remote commitment: %s\n",
tal_hex(NULL, linearize_tx(NULL, remote_txs[0])));
if (!derive_simple_privkey(&local.htlc_basepoint_secret,
&localbase.htlc,
&remote_per_commit_point,
&local_htlc_privkey))
errx(1, "Failure deriving local htlc privkey");
if (!derive_simple_key(&localbase.htlc,
&remote_per_commit_point,
&local_htlc_pubkey))
errx(1, "Failure deriving local htlc pubkey");
if (!derive_simple_privkey(&remote.htlc_basepoint_secret,
&remotebase.htlc,
&remote_per_commit_point,
&remote_htlc_privkey))
errx(1, "Failure deriving remote htlc privkey");
if (!derive_simple_key(&remotebase.htlc,
&remote_per_commit_point,
&remote_htlc_pubkey))
errx(1, "Failure deriving remote htlc pubkey");
for (size_t i = 0; i < tal_count(htlcmap); i++) {
struct bitcoin_signature local_htlc_sig, remote_htlc_sig;
struct amount_sat amt;
if (!htlcmap[i])
continue;
printf("# Output %zu: %s HTLC %"PRIu64"\n",
i, side_to_str(htlc_owner(htlcmap[i])), htlcmap[i]->id);
printf("# unsigned htlc tx for output %zu: %s\n",
i, tal_hex(NULL, linearize_tx(NULL, remote_txs[1+i])));
amt = amount_msat_to_sat_round_down(htlcmap[i]->amount);
remote_txs[1+i]->input_amounts[0]
= tal_dup(remote_txs[1+i], struct amount_sat, &amt);
printf("# wscript: %s\n", tal_hex(NULL, wscripts[1+i]));
sign_tx_input(remote_txs[1+i], 0, NULL, wscripts[1+i],
&local_htlc_privkey, &local_htlc_pubkey,
SIGHASH_ALL, &local_htlc_sig);
sign_tx_input(remote_txs[1+i], 0, NULL, wscripts[1+i],
&remote_htlc_privkey, &remote_htlc_pubkey,
SIGHASH_ALL, &remote_htlc_sig);
printf("localsig_on_remote output %zu: %s\n",
i, sig_as_hex(&local_htlc_sig));
printf("remotesig_on_remote output %zu: %s\n",
i, sig_as_hex(&remote_htlc_sig));
if (htlc_owner(htlcmap[i]) == REMOTE)
witness = bitcoin_witness_htlc_timeout_tx(NULL,
&remote_htlc_sig,
&local_htlc_sig,
wscripts[1+i]);
else
witness = bitcoin_witness_htlc_success_tx(NULL,
&remote_htlc_sig,
&local_htlc_sig,
preimage_of(&htlcmap[i]->rhash, htlcs, preimages),
wscripts[1+i]);
bitcoin_tx_input_set_witness(remote_txs[1+i], 0, witness);
printf("htlc tx for output %zu: %s\n",
i, tal_hex(NULL, linearize_tx(NULL, remote_txs[1+i])));
}
printf("\n");
return 0;
}
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