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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
#include "config.h"
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#include <assert.h>
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#include <tests/fuzz/libfuzz.h>
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#include <bitcoin/pubkey.h>
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#include <bitcoin/chainparams.h>
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#include <bitcoin/script.h>
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#include <common/close_tx.h>
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#include <common/setup.h>
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#include <common/utils.h>
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#include <wire/wire.h>
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void init(int *argc, char ***argv)
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{
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common_setup("fuzzer");
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chainparams = chainparams_for_network("bitcoin");
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}
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void run(const uint8_t *data, size_t size)
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{
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const uint8_t *wire_ptr;
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size_t wire_max, min_size, script_size;
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struct bitcoin_outpoint outpoint;
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struct amount_sat funding, to_us, to_them, dust_limit, max;
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const uint8_t *our_script, *their_script, *funding_script;
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struct pubkey *pk1, *pk2;
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/* create_close_tx wants:
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* - 3 scripts: 3 * N bytes
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* - 1 txid: 32 bytes
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* - 1 u32: 4 bytes
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* - 4 amount_sat: 4 * 8 bytes
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*
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* Since both output scripts size are not restricted, we also try
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* to vary their length.
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* Therefore, we allocate the entire remaining bytes to scripts.
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*/
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min_size = 8 * 3 + 4 + 32;
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if (size < min_size + 2)
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return;
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script_size = (size - min_size) / 2;
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wire_ptr = data;
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wire_max = 8;
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to_us = fromwire_amount_sat(&wire_ptr, &wire_max);
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assert(wire_ptr);
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wire_max = 8;
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to_them = fromwire_amount_sat(&wire_ptr, &wire_max);
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assert(wire_ptr);
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wire_max = 8;
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dust_limit = fromwire_amount_sat(&wire_ptr, &wire_max);
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/* The funding must be > to_us + to_them (TODO: we could simulate some fees) .. */
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if (!(amount_sat_add(&funding, to_us, to_them)))
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return;
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/* .. And < max_btc as we assert it's not nonsensical! */
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max = AMOUNT_SAT((u32)WALLY_SATOSHI_PER_BTC * WALLY_BTC_MAX);
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if (amount_sat_greater(funding, max)) {
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funding = max;
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to_us = amount_sat_div(max, 2);
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to_them = amount_sat_div(max, 2);
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}
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wire_max = 36;
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fromwire_bitcoin_outpoint(&wire_ptr, &wire_max, &outpoint);
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our_script = tal_dup_arr(tmpctx, const uint8_t, wire_ptr, script_size, 0);
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their_script = tal_dup_arr(tmpctx, const uint8_t, wire_ptr + script_size,
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script_size, 0);
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/* We assert it's valid, so we can't throw garbage at the funding script.. */
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pk1 = tal(tmpctx, struct pubkey);
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pk2 = tal(tmpctx, struct pubkey);
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pubkey_from_hexstr("034fede2c619f647fe7c01d40ae22e4c285291ca2ffb47937bbfb7d6e8285a081f",
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PUBKEY_CMPR_LEN, pk1);
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pubkey_from_hexstr("028dfe31019dd61fa04c76ad065410e5d063ac2949c04c14b214c1b363e517452f",
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PUBKEY_CMPR_LEN, pk2);
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funding_script = bitcoin_redeem_2of2(tmpctx, pk1, pk2);
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create_close_tx(tmpctx, chainparams, NULL, NULL, our_script,
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their_script, funding_script, &outpoint,
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funding, to_us, to_them, dust_limit);
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clean_tmpctx();
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}
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