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#include "wire.h"
#include <assert.h>
#include <bitcoin/chainparams.h>
#include <bitcoin/preimage.h>
#include <bitcoin/pubkey.h>
#include <bitcoin/shadouble.h>
#include <bitcoin/tx.h>
#include <ccan/build_assert/build_assert.h>
#include <ccan/crypto/siphash24/siphash24.h>
#include <ccan/endian/endian.h>
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <common/amount.h>
#include <common/node_id.h>
#include <common/type_to_string.h>
#include <common/utils.h>
#ifndef SUPERVERBOSE
#define SUPERVERBOSE(...)
#endif
/* Sets *cursor to NULL and returns NULL when extraction fails. */
const void *fromwire_fail(const u8 **cursor, size_t *max)
{
*cursor = NULL;
*max = 0;
return NULL;
}
const u8 *fromwire(const u8 **cursor, size_t *max, void *copy, size_t n)
{
const u8 *p = *cursor;
if (*max < n) {
/* Just make sure we don't leak uninitialized mem! */
if (copy)
memset(copy, 0, n);
if (*cursor)
SUPERVERBOSE("less than encoding length");
return fromwire_fail(cursor, max);
}
*cursor += n;
*max -= n;
if (copy)
memcpy(copy, p, n);
return memcheck(p, n);
}
int fromwire_peektype(const u8 *cursor)
{
be16 be_type;
size_t max = tal_count(cursor);
fromwire(&cursor, &max, &be_type, sizeof(be_type));
if (!cursor)
return -1;
return be16_to_cpu(be_type);
}
u8 fromwire_u8(const u8 **cursor, size_t *max)
{
u8 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return ret;
}
u16 fromwire_u16(const u8 **cursor, size_t *max)
{
be16 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return be16_to_cpu(ret);
}
u32 fromwire_u32(const u8 **cursor, size_t *max)
{
be32 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return be32_to_cpu(ret);
}
u64 fromwire_u64(const u8 **cursor, size_t *max)
{
be64 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return be64_to_cpu(ret);
}
static u64 fromwire_tlv_uint(const u8 **cursor, size_t *max, size_t maxlen)
{
u8 bytes[8];
size_t length;
be64 val;
assert(maxlen <= sizeof(bytes));
/* BOLT-EXPERIMENTAL #1:
*
* - if `length` is not exactly equal to that required for the
* known encoding for `type`:
* - MUST fail to parse the `tlv_stream`.
*/
length = *max;
if (length > maxlen) {
SUPERVERBOSE("greater than encoding length");
fromwire_fail(cursor, max);
return 0;
}
memset(bytes, 0, sizeof(bytes));
fromwire(cursor, max, bytes + sizeof(bytes) - length, length);
/* BOLT-EXPERIMENTAL #1:
* - if variable-length fields within the known encoding for `type` are
* not minimal:
* - MUST fail to parse the `tlv_stream`.
*/
if (length > 0 && bytes[sizeof(bytes) - length] == 0) {
SUPERVERBOSE("not minimal");
fromwire_fail(cursor, max);
return 0;
}
BUILD_ASSERT(sizeof(val) == sizeof(bytes));
memcpy(&val, bytes, sizeof(bytes));
return be64_to_cpu(val);
}
u16 fromwire_tu16(const u8 **cursor, size_t *max)
{
return fromwire_tlv_uint(cursor, max, 2);
}
u32 fromwire_tu32(const u8 **cursor, size_t *max)
{
return fromwire_tlv_uint(cursor, max, 4);
}
u64 fromwire_tu64(const u8 **cursor, size_t *max)
{
return fromwire_tlv_uint(cursor, max, 8);
}
void fromwire_double(const u8 **cursor, size_t *max, double *ret)
{
fromwire(cursor, max, ret, sizeof(*ret));
}
bool fromwire_bool(const u8 **cursor, size_t *max)
{
u8 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return false;
if (ret != 0 && ret != 1)
fromwire_fail(cursor, max);
return ret;
}
bigsize_t fromwire_bigsize(const u8 **cursor, size_t *max)
{
bigsize_t v;
size_t len = bigsize_get(*cursor, *max, &v);
if (len == 0) {
fromwire_fail(cursor, max);
return 0;
}
assert(len <= *max);
fromwire(cursor, max, NULL, len);
return v;
}
void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey)
{
u8 der[PUBKEY_CMPR_LEN];
if (!fromwire(cursor, max, der, sizeof(der)))
return;
if (!pubkey_from_der(der, sizeof(der), pubkey)) {
SUPERVERBOSE("not a valid point");
fromwire_fail(cursor, max);
}
}
void fromwire_node_id(const u8 **cursor, size_t *max, struct node_id *id)
{
fromwire(cursor, max, &id->k, sizeof(id->k));
}
void fromwire_secret(const u8 **cursor, size_t *max, struct secret *secret)
{
fromwire(cursor, max, secret->data, sizeof(secret->data));
}
void fromwire_privkey(const u8 **cursor, size_t *max, struct privkey *privkey)
{
fromwire_secret(cursor, max, &privkey->secret);
}
void fromwire_secp256k1_ecdsa_signature(const u8 **cursor,
size_t *max, secp256k1_ecdsa_signature *sig)
{
u8 compact[64];
if (!fromwire(cursor, max, compact, sizeof(compact)))
return;
if (secp256k1_ecdsa_signature_parse_compact(secp256k1_ctx, sig, compact)
!= 1)
fromwire_fail(cursor, max);
}
void fromwire_secp256k1_ecdsa_recoverable_signature(const u8 **cursor,
size_t *max,
secp256k1_ecdsa_recoverable_signature *rsig)
{
u8 compact[64];
int recid;
fromwire(cursor, max, compact, sizeof(compact));
recid = fromwire_u8(cursor, max);
if (secp256k1_ecdsa_recoverable_signature_parse_compact(secp256k1_ctx,
rsig, compact,
recid) != 1)
fromwire_fail(cursor, max);
}
void fromwire_channel_id(const u8 **cursor, size_t *max,
struct channel_id *channel_id)
{
fromwire(cursor, max, channel_id, sizeof(*channel_id));
}
void fromwire_short_channel_id(const u8 **cursor, size_t *max,
struct short_channel_id *short_channel_id)
{
short_channel_id->u64 = fromwire_u64(cursor, max);
}
void fromwire_short_channel_id_dir(const u8 **cursor, size_t *max,
struct short_channel_id_dir *scidd)
{
fromwire_short_channel_id(cursor, max, &scidd->scid);
scidd->dir = fromwire_bool(cursor, max);
}
void fromwire_sha256(const u8 **cursor, size_t *max, struct sha256 *sha256)
{
fromwire(cursor, max, sha256, sizeof(*sha256));
}
void fromwire_sha256_double(const u8 **cursor, size_t *max,
struct sha256_double *sha256d)
{
fromwire_sha256(cursor, max, &sha256d->sha);
}
void fromwire_bitcoin_txid(const u8 **cursor, size_t *max,
struct bitcoin_txid *txid)
{
fromwire_sha256_double(cursor, max, &txid->shad);
}
void fromwire_bitcoin_signature(const u8 **cursor, size_t *max,
struct bitcoin_signature *sig)
{
fromwire_secp256k1_ecdsa_signature(cursor, max, &sig->s);
sig->sighash_type = fromwire_u8(cursor, max);
if (!sighash_type_valid(sig->sighash_type))
fromwire_fail(cursor, max);
}
void fromwire_bitcoin_blkid(const u8 **cursor, size_t *max,
struct bitcoin_blkid *blkid)
{
fromwire_sha256_double(cursor, max, &blkid->shad);
}
void fromwire_preimage(const u8 **cursor, size_t *max, struct preimage *preimage)
{
fromwire(cursor, max, preimage, sizeof(*preimage));
}
void fromwire_ripemd160(const u8 **cursor, size_t *max, struct ripemd160 *ripemd)
{
fromwire(cursor, max, ripemd, sizeof(*ripemd));
}
void fromwire_u8_array(const u8 **cursor, size_t *max, u8 *arr, size_t num)
{
fromwire(cursor, max, arr, num);
}
void fromwire_pad(const u8 **cursor, size_t *max, size_t num)
{
fromwire(cursor, max, NULL, num);
}
/*
* Don't allow control chars except spaces: we only use this for stuff
* from subdaemons, who shouldn't do that.
*/
char *fromwire_wirestring(const tal_t *ctx, const u8 **cursor, size_t *max)
{
size_t i;
for (i = 0; i < *max; i++) {
if ((*cursor)[i] == '\0') {
char *str = tal_arr(ctx, char, i + 1);
fromwire(cursor, max, str, i + 1);
return str;
}
if ((*cursor)[i] < ' ')
break;
}
fromwire_fail(cursor, max);
return NULL;
}
REGISTER_TYPE_TO_HEXSTR(channel_id);
/* BOLT #2:
*
* This message introduces the `channel_id` to identify the channel. It's
* derived from the funding transaction by combining the `funding_txid` and
* the `funding_output_index`, using big-endian exclusive-OR
* (i.e. `funding_output_index` alters the last 2 bytes).
*/
void derive_channel_id(struct channel_id *channel_id,
const struct bitcoin_txid *txid, u16 txout)
{
BUILD_ASSERT(sizeof(*channel_id) == sizeof(*txid));
memcpy(channel_id, txid, sizeof(*channel_id));
channel_id->id[sizeof(*channel_id)-2] ^= txout >> 8;
channel_id->id[sizeof(*channel_id)-1] ^= txout;
}
struct bitcoin_tx *fromwire_bitcoin_tx(const tal_t *ctx,
const u8 **cursor, size_t *max)
{
return pull_bitcoin_tx(ctx, cursor, max);
}
void fromwire_siphash_seed(const u8 **cursor, size_t *max,
struct siphash_seed *seed)
{
fromwire(cursor, max, seed, sizeof(*seed));
}
struct amount_msat fromwire_amount_msat(const u8 **cursor, size_t *max)
{
struct amount_msat msat;
msat.millisatoshis = fromwire_u64(cursor, max); /* Raw: primitive */
return msat;
}
struct amount_sat fromwire_amount_sat(const u8 **cursor, size_t *max)
{
struct amount_sat sat;
sat.satoshis = fromwire_u64(cursor, max); /* Raw: primitive */
return sat;
}
void fromwire_bip32_key_version(const u8** cursor, size_t *max,
struct bip32_key_version *version)
{
version->bip32_pubkey_version = fromwire_u32(cursor, max);
version->bip32_privkey_version = fromwire_u32(cursor, max);
}
struct bitcoin_tx_output *fromwire_bitcoin_tx_output(const tal_t *ctx,
const u8 **cursor, size_t *max)
{
struct bitcoin_tx_output *output = tal(ctx, struct bitcoin_tx_output);
output->amount = fromwire_amount_sat(cursor, max);
u16 script_len = fromwire_u16(cursor, max);
output->script = tal_arr(output, u8, script_len);
fromwire_u8_array(cursor, max, output->script, script_len);
return output;
}