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#include "txfilter.h"
#include <bitcoin/script.h>
#include <ccan/build_assert/build_assert.h>
#include <ccan/crypto/ripemd160/ripemd160.h>
#include <ccan/mem/mem.h>
#include <common/memleak.h>
#include <common/pseudorand.h>
#include <common/utils.h>
#include <wallet/wallet.h>
struct txfilter {
const u8 **scriptpubkeys;
};
struct outpointfilter_entry {
struct bitcoin_txid txid;
u32 outnum;
};
static size_t outpoint_hash(const struct outpointfilter_entry *out)
{
struct siphash24_ctx ctx;
siphash24_init(&ctx, siphash_seed());
siphash24_update(&ctx, &out->txid, sizeof(out->txid));
siphash24_u32(&ctx, out->outnum);
return siphash24_done(&ctx);
}
static bool outpoint_eq(const struct outpointfilter_entry *o1,
const struct outpointfilter_entry *o2)
{
return bitcoin_txid_eq(&o1->txid, &o2->txid) && o1->outnum == o2->outnum;
}
static const struct outpointfilter_entry *outpoint_keyof(const struct outpointfilter_entry *out)
{
return out;
}
HTABLE_DEFINE_TYPE(struct outpointfilter_entry, outpoint_keyof, outpoint_hash, outpoint_eq,
outpointset);
struct outpointfilter {
struct outpointset *set;
};
struct txfilter *txfilter_new(const tal_t *ctx)
{
struct txfilter *filter = tal(ctx, struct txfilter);
filter->scriptpubkeys = tal_arr(filter, const u8 *, 0);
return filter;
}
void txfilter_add_scriptpubkey(struct txfilter *filter, const u8 *script TAKES)
{
tal_arr_expand(&filter->scriptpubkeys,
tal_dup_arr(filter, u8, script, tal_count(script), 0));
}
void txfilter_add_derkey(struct txfilter *filter,
const u8 derkey[PUBKEY_DER_LEN])
{
u8 *skp, *p2sh;
skp = scriptpubkey_p2wpkh_derkey(tmpctx, derkey);
p2sh = scriptpubkey_p2sh(tmpctx, skp);
txfilter_add_scriptpubkey(filter, take(skp));
txfilter_add_scriptpubkey(filter, take(p2sh));
}
bool txfilter_match(const struct txfilter *filter, const struct bitcoin_tx *tx)
{
for (size_t i = 0; i < tal_count(tx->output); i++) {
u8 *oscript = tx->output[i].script;
for (size_t j = 0; j < tal_count(filter->scriptpubkeys); j++) {
if (scripteq(oscript, filter->scriptpubkeys[j]))
return true;
}
}
return false;
}
void outpointfilter_add(struct outpointfilter *of, const struct bitcoin_txid *txid, const u32 outnum)
{
struct outpointfilter_entry *op;
if (outpointfilter_matches(of, txid, outnum))
return;
/* Have to mark the entries as notleak since they'll not be
* pointed to by anything other than the htable */
op = notleak(tal(of->set, struct outpointfilter_entry));
op->txid = *txid;
op->outnum = outnum;
outpointset_add(of->set, op);
}
bool outpointfilter_matches(struct outpointfilter *of, const struct bitcoin_txid *txid, const u32 outnum)
{
struct outpointfilter_entry op;
op.txid = *txid;
op.outnum = outnum;
return outpointset_get(of->set, &op) != NULL;
}
void outpointfilter_remove(struct outpointfilter *of, const struct bitcoin_txid *txid, const u32 outnum)
{
struct outpointfilter_entry op;
op.txid = *txid;
op.outnum = outnum;
outpointset_del(of->set, &op);
}
struct outpointfilter *outpointfilter_new(tal_t *ctx)
{
struct outpointfilter *opf = tal(ctx, struct outpointfilter);
opf->set = tal(opf, struct outpointset);
outpointset_init(opf->set);
return opf;
}