129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
#ifndef LIGHTNING_BITCOIN_TX_H
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#define LIGHTNING_BITCOIN_TX_H
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#include "config.h"
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#include "shadouble.h"
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#include "signature.h"
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#include "varint.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/structeq/structeq.h>
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#include <ccan/tal/tal.h>
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#include <common/amount.h>
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#include <wally_transaction.h>
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#define BITCOIN_TX_DEFAULT_SEQUENCE 0xFFFFFFFF
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struct bitcoin_txid {
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struct sha256_double shad;
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};
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/* Define bitcoin_txid_eq */
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STRUCTEQ_DEF(bitcoin_txid, 0, shad.sha.u);
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struct bitcoin_tx {
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struct bitcoin_tx_input *input;
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struct bitcoin_tx_output *output;
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struct wally_tx *wtx;
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/* Keep track of how many inputs and outputs were filled so far. This
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* is needed since we allocate them in bulk. */
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size_t used_inputs, used_outputs;
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};
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struct bitcoin_tx_output {
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struct amount_sat amount;
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u8 *script;
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};
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struct bitcoin_tx_input {
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struct bitcoin_txid txid;
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u32 index; /* output number referred to by above */
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u8 *script;
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u32 sequence_number;
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/* Value of the output we're spending (NULL if unknown). */
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struct amount_sat *amount;
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/* Only if BIP141 used. */
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u8 **witness;
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};
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/* SHA256^2 the tx: simpler than sha256_tx */
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void bitcoin_txid(const struct bitcoin_tx *tx, struct bitcoin_txid *txid);
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/* Useful for signature code. Only supports SIGHASH_ALL and
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* (for segwit) SIGHASH_SINGLE|SIGHASH_ANYONECANPAY. */
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void sha256_tx_for_sig(struct sha256_double *h, const struct bitcoin_tx *tx,
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unsigned int input_num,
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const u8 *script,
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const u8 *witness_script,
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enum sighash_type sighash_type);
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/* Linear bytes of tx. */
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u8 *linearize_tx(const tal_t *ctx, const struct bitcoin_tx *tx);
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/* Get weight of tx in Sipa. */
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size_t measure_tx_weight(const struct bitcoin_tx *tx);
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/* Allocate a tx: you just need to fill in inputs and outputs (they're
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* zeroed with inputs' sequence_number set to FFFFFFFF) */
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struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
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varint_t output_count);
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/* This takes a raw bitcoin tx in hex. */
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struct bitcoin_tx *bitcoin_tx_from_hex(const tal_t *ctx, const char *hex,
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size_t hexlen);
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/* Parse hex string to get txid (reversed, a-la bitcoind). */
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bool bitcoin_txid_from_hex(const char *hexstr, size_t hexstr_len,
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struct bitcoin_txid *txid);
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/* Get hex string of txid (reversed, a-la bitcoind). */
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bool bitcoin_txid_to_hex(const struct bitcoin_txid *txid,
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char *hexstr, size_t hexstr_len);
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/* Internal de-linearization functions. */
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struct bitcoin_tx *pull_bitcoin_tx(const tal_t *ctx,
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const u8 **cursor, size_t *max);
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int bitcoin_tx_add_output(struct bitcoin_tx *tx, u8 *script,
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struct amount_sat *amount);
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int bitcoin_tx_add_input(struct bitcoin_tx *tx, const struct bitcoin_txid *txid,
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u32 outnum, u32 sequence,
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const struct amount_sat *amount, u8 *script);
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/**
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* Set the output amount on the transaction.
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*
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* Allows changing the amount on the transaction output after it was set on
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* creation. This is useful to grind a feerate or subtract the fee from an
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* existing output.
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*/
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void bitcoin_tx_output_set_amount(struct bitcoin_tx *tx, int outnum,
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struct amount_sat *amount);
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/**
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* Set the input witness.
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*
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* Given that we generate the witness after constructing the transaction
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* itself, we need a way to attach a witness to an existing input.
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*/
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void bitcoin_tx_input_set_witness(struct bitcoin_tx *tx, int innum,
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u8 **witness);
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/**
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* Set the input script on the given input.
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*/
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void bitcoin_tx_input_set_script(struct bitcoin_tx *tx, int innum, u8 *script);
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/**
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* Check a transaction for consistency.
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*
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* Mainly for the transition from `bitcoin_tx` to the `wally_tx`. Checks that
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* both transactions serialize to two identical representations.
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*/
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bool bitcoin_tx_check(const struct bitcoin_tx *tx);
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#endif /* LIGHTNING_BITCOIN_TX_H */
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