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monero/src/wallet/ringdb.cpp
Kevin Barbour 85db1734e7
Remove unused variables in monero codebase 
There are quite a few variables in the code that are no longer
(or perhaps never were) in use. These were discovered by enabling
compiler warnings for unused variables and cleaning them up.

In most cases where the unused variables were the result
of a function call the call was left but the variable
assignment removed, unless it was obvious that it was
a simple getter with no side effects.
2021-02-09 08:05:05 +01:00

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// Copyright (c) 2018, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <lmdb.h>
#include <boost/algorithm/string.hpp>
#include <boost/range/adaptor/transformed.hpp>
#include <boost/filesystem.hpp>
#include "common/util.h"
#include "misc_log_ex.h"
#include "misc_language.h"
#include "wallet_errors.h"
#include "ringdb.h"
#include "cryptonote_config.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "wallet.ringdb"
#define V1TAG ((uint64_t)798237759845202)
static int compare_hash32(const MDB_val *a, const MDB_val *b)
{
uint32_t *va = (uint32_t*) a->mv_data;
uint32_t *vb = (uint32_t*) b->mv_data;
for (int n = 7; n >= 0; n--)
{
if (va[n] == vb[n])
continue;
return va[n] < vb[n] ? -1 : 1;
}
return 0;
}
static int compare_uint64(const MDB_val *a, const MDB_val *b)
{
const uint64_t va = *(const uint64_t*) a->mv_data;
const uint64_t vb = *(const uint64_t*) b->mv_data;
return va < vb ? -1 : va > vb;
}
static std::string compress_ring(const std::vector<uint64_t> &ring, uint64_t tag)
{
std::string s;
s += tools::get_varint_data(tag);
for (uint64_t out: ring)
s += tools::get_varint_data(out);
return s;
}
static std::vector<uint64_t> decompress_ring(const std::string &s, uint64_t tag)
{
std::vector<uint64_t> ring;
int read = 0;
for (std::string::const_iterator i = s.begin(); i != s.cend(); std::advance(i, read))
{
uint64_t out;
std::string tmp(i, s.cend());
read = tools::read_varint(tmp.begin(), tmp.end(), out);
THROW_WALLET_EXCEPTION_IF(read <= 0 || read > 256, tools::error::wallet_internal_error, "Internal error decompressing ring");
if (tag)
{
if (tag != out)
return {};
tag = 0;
continue;
}
ring.push_back(out);
}
return ring;
}
std::string get_rings_filename(boost::filesystem::path filename)
{
if (!boost::filesystem::is_directory(filename))
filename.remove_filename();
return filename.string();
}
static crypto::chacha_iv make_iv(const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
{
uint8_t buffer[sizeof(key_image) + sizeof(key) + sizeof(config::HASH_KEY_RINGDB) + sizeof(field)];
memcpy(buffer, &key_image, sizeof(key_image));
memcpy(buffer + sizeof(key_image), &key, sizeof(key));
memcpy(buffer + sizeof(key_image) + sizeof(key), config::HASH_KEY_RINGDB, sizeof(config::HASH_KEY_RINGDB));
memcpy(buffer + sizeof(key_image) + sizeof(key) + sizeof(config::HASH_KEY_RINGDB), &field, sizeof(field));
crypto::hash hash;
// if field is 0, backward compat mode: hash without the field
crypto::cn_fast_hash(buffer, sizeof(buffer) - !field, hash.data);
static_assert(sizeof(hash) >= CHACHA_IV_SIZE, "Incompatible hash and chacha IV sizes");
crypto::chacha_iv iv;
memcpy(&iv, &hash, CHACHA_IV_SIZE);
return iv;
}
static std::string encrypt(const std::string &plaintext, const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
{
const crypto::chacha_iv iv = make_iv(key_image, key, field);
std::string ciphertext;
ciphertext.resize(plaintext.size() + sizeof(iv));
crypto::chacha20(plaintext.data(), plaintext.size(), key, iv, &ciphertext[sizeof(iv)]);
memcpy(&ciphertext[0], &iv, sizeof(iv));
return ciphertext;
}
static std::string encrypt(const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
{
return encrypt(std::string((const char*)&key_image, sizeof(key_image)), key_image, key, field);
}
static std::string decrypt(const std::string &ciphertext, const crypto::key_image &key_image, const crypto::chacha_key &key, uint8_t field)
{
const crypto::chacha_iv iv = make_iv(key_image, key, field);
std::string plaintext;
THROW_WALLET_EXCEPTION_IF(ciphertext.size() < sizeof(iv), tools::error::wallet_internal_error, "Bad ciphertext text");
plaintext.resize(ciphertext.size() - sizeof(iv));
crypto::chacha20(ciphertext.data() + sizeof(iv), ciphertext.size() - sizeof(iv), key, iv, &plaintext[0]);
return plaintext;
}
static void store_relative_ring(MDB_txn *txn, MDB_dbi &dbi, const crypto::key_image &key_image, const std::vector<uint64_t> &relative_ring, const crypto::chacha_key &chacha_key)
{
MDB_val key, data;
std::string key_ciphertext = encrypt(key_image, chacha_key, 0);
key.mv_data = (void*)key_ciphertext.data();
key.mv_size = key_ciphertext.size();
std::string compressed_ring = compress_ring(relative_ring, V1TAG);
std::string data_ciphertext = encrypt(compressed_ring, key_image, chacha_key, 1);
data.mv_size = data_ciphertext.size();
data.mv_data = (void*)data_ciphertext.c_str();
int dbr = mdb_put(txn, dbi, &key, &data, 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set ring for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
}
static int resize_env(MDB_env *env, const char *db_path, size_t needed)
{
MDB_envinfo mei;
MDB_stat mst;
int ret;
needed = std::max(needed, (size_t)(100ul * 1024 * 1024)); // at least 100 MB
ret = mdb_env_info(env, &mei);
if (ret)
return ret;
ret = mdb_env_stat(env, &mst);
if (ret)
return ret;
uint64_t size_used = mst.ms_psize * mei.me_last_pgno;
uint64_t mapsize = mei.me_mapsize;
if (size_used + needed > mei.me_mapsize)
{
try
{
boost::filesystem::path path(db_path);
boost::filesystem::space_info si = boost::filesystem::space(path);
if(si.available < needed)
{
MERROR("!! WARNING: Insufficient free space to extend database !!: " << (si.available >> 20L) << " MB available");
return ENOSPC;
}
}
catch(...)
{
// print something but proceed.
MWARNING("Unable to query free disk space.");
}
mapsize += needed;
}
return mdb_env_set_mapsize(env, mapsize);
}
static size_t get_ring_data_size(size_t n_entries)
{
return n_entries * (32 + 1024); // highball 1kB for the ring data to make sure
}
enum { BLACKBALL_BLACKBALL, BLACKBALL_UNBLACKBALL, BLACKBALL_QUERY, BLACKBALL_CLEAR};
namespace tools
{
ringdb::ringdb(std::string filename, const std::string &genesis):
filename(filename),
env(NULL)
{
MDB_txn *txn;
bool tx_active = false;
int dbr;
tools::create_directories_if_necessary(filename);
dbr = mdb_env_create(&env);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
dbr = mdb_env_set_maxdbs(env, 2);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
const std::string actual_filename = get_rings_filename(filename);
dbr = mdb_env_open(env, actual_filename.c_str(), 0, 0664);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file '"
+ actual_filename + "': " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
dbr = mdb_dbi_open(txn, ("rings-" + genesis).c_str(), MDB_CREATE, &dbi_rings);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
mdb_set_compare(txn, dbi_rings, compare_hash32);
dbr = mdb_dbi_open(txn, ("blackballs2-" + genesis).c_str(), MDB_CREATE | MDB_INTEGERKEY | MDB_DUPSORT | MDB_DUPFIXED, &dbi_blackballs);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
mdb_set_dupsort(txn, dbi_blackballs, compare_uint64);
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn creating/opening database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
}
ringdb::~ringdb()
{
close();
}
void ringdb::close()
{
if (env)
{
mdb_dbi_close(env, dbi_rings);
mdb_dbi_close(env, dbi_blackballs);
mdb_env_close(env);
env = NULL;
}
}
bool ringdb::add_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), get_ring_data_size(tx.vin.size()));
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
for (const auto &in: tx.vin)
{
if (in.type() != typeid(cryptonote::txin_to_key))
continue;
const auto &txin = boost::get<cryptonote::txin_to_key>(in);
const uint32_t ring_size = txin.key_offsets.size();
if (ring_size == 1)
continue;
store_relative_ring(txn, dbi_rings, txin.k_image, txin.key_offsets, chacha_key);
}
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn adding ring to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::remove_rings(const crypto::chacha_key &chacha_key, const std::vector<crypto::key_image> &key_images)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
for (const crypto::key_image &key_image: key_images)
{
MDB_val key, data;
std::string key_ciphertext = encrypt(key_image, chacha_key, 0);
key.mv_data = (void*)key_ciphertext.data();
key.mv_size = key_ciphertext.size();
dbr = mdb_get(txn, dbi_rings, &key, &data);
THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to look for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
if (dbr == MDB_NOTFOUND)
continue;
THROW_WALLET_EXCEPTION_IF(data.mv_size <= 0, tools::error::wallet_internal_error, "Invalid ring data size");
MDEBUG("Removing ring data for key image " << key_image);
dbr = mdb_del(txn, dbi_rings, &key, NULL);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to remove ring to database: " + std::string(mdb_strerror(dbr)));
}
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn removing ring to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::remove_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx)
{
std::vector<crypto::key_image> key_images;
key_images.reserve(tx.vin.size());
for (const auto &in: tx.vin)
{
if (in.type() != typeid(cryptonote::txin_to_key))
continue;
const auto &txin = boost::get<cryptonote::txin_to_key>(in);
const uint32_t ring_size = txin.key_offsets.size();
if (ring_size == 1)
continue;
key_images.push_back(txin.k_image);
}
return remove_rings(chacha_key, key_images);
}
bool ringdb::get_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
MDB_val key, data;
std::string key_ciphertext = encrypt(key_image, chacha_key, 0);
key.mv_data = (void*)key_ciphertext.data();
key.mv_size = key_ciphertext.size();
dbr = mdb_get(txn, dbi_rings, &key, &data);
THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to look for key image in LMDB table: " + std::string(mdb_strerror(dbr)));
if (dbr == MDB_NOTFOUND)
return false;
THROW_WALLET_EXCEPTION_IF(data.mv_size <= 0, tools::error::wallet_internal_error, "Invalid ring data size");
bool try_v0 = false;
std::string data_plaintext = decrypt(std::string((const char*)data.mv_data, data.mv_size), key_image, chacha_key, 1);
try { outs = decompress_ring(data_plaintext, V1TAG); if (outs.empty()) try_v0 = true; }
catch(...) { try_v0 = true; }
if (try_v0)
{
data_plaintext = decrypt(std::string((const char*)data.mv_data, data.mv_size), key_image, chacha_key, 0);
outs = decompress_ring(data_plaintext, 0);
}
MDEBUG("Found ring for key image " << key_image << ":");
MDEBUG("Relative: " << boost::join(outs | boost::adaptors::transformed([](uint64_t out){return std::to_string(out);}), " "));
outs = cryptonote::relative_output_offsets_to_absolute(outs);
MDEBUG("Absolute: " << boost::join(outs | boost::adaptors::transformed([](uint64_t out){return std::to_string(out);}), " "));
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn getting ring from database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::set_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, const std::vector<uint64_t> &outs, bool relative)
{
MDB_txn *txn;
int dbr;
bool tx_active = false;
dbr = resize_env(env, filename.c_str(), outs.size() * 64);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
store_relative_ring(txn, dbi_rings, key_image, relative ? outs : cryptonote::absolute_output_offsets_to_relative(outs), chacha_key);
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn setting ring to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return true;
}
bool ringdb::blackball_worker(const std::vector<std::pair<uint64_t, uint64_t>> &outputs, int op)
{
MDB_txn *txn;
MDB_cursor *cursor;
int dbr;
bool tx_active = false;
bool ret = true;
THROW_WALLET_EXCEPTION_IF(outputs.size() > 1 && op == BLACKBALL_QUERY, tools::error::wallet_internal_error, "Blackball query only makes sense for a single output");
dbr = resize_env(env, filename.c_str(), 32 * 2 * outputs.size()); // a pubkey, and some slack
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
dbr = mdb_txn_begin(env, NULL, 0, &txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
tx_active = true;
dbr = mdb_cursor_open(txn, dbi_blackballs, &cursor);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create cursor for blackballs table: " + std::string(mdb_strerror(dbr)));
MDB_val key, data;
for (const std::pair<uint64_t, uint64_t> &output: outputs)
{
key.mv_data = (void*)&output.first;
key.mv_size = sizeof(output.first);
data.mv_data = (void*)&output.second;
data.mv_size = sizeof(output.second);
switch (op)
{
case BLACKBALL_BLACKBALL:
MDEBUG("Marking output " << output.first << "/" << output.second << " as spent");
dbr = mdb_cursor_put(cursor, &key, &data, MDB_NODUPDATA);
if (dbr == MDB_KEYEXIST)
dbr = 0;
break;
case BLACKBALL_UNBLACKBALL:
MDEBUG("Marking output " << output.first << "/" << output.second << " as unspent");
dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
if (dbr == 0)
dbr = mdb_cursor_del(cursor, 0);
break;
case BLACKBALL_QUERY:
dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to lookup in blackballs table: " + std::string(mdb_strerror(dbr)));
ret = dbr != MDB_NOTFOUND;
if (dbr == MDB_NOTFOUND)
dbr = 0;
break;
case BLACKBALL_CLEAR:
break;
default:
THROW_WALLET_EXCEPTION(tools::error::wallet_internal_error, "Invalid blackball op");
}
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to query blackballs table: " + std::string(mdb_strerror(dbr)));
}
mdb_cursor_close(cursor);
if (op == BLACKBALL_CLEAR)
{
dbr = mdb_drop(txn, dbi_blackballs, 0);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to clear blackballs table: " + std::string(mdb_strerror(dbr)));
}
dbr = mdb_txn_commit(txn);
THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn blackballing output to database: " + std::string(mdb_strerror(dbr)));
tx_active = false;
return ret;
}
bool ringdb::blackball(const std::vector<std::pair<uint64_t, uint64_t>> &outputs)
{
return blackball_worker(outputs, BLACKBALL_BLACKBALL);
}
bool ringdb::blackball(const std::pair<uint64_t, uint64_t> &output)
{
std::vector<std::pair<uint64_t, uint64_t>> outputs(1, output);
return blackball_worker(outputs, BLACKBALL_BLACKBALL);
}
bool ringdb::unblackball(const std::pair<uint64_t, uint64_t> &output)
{
std::vector<std::pair<uint64_t, uint64_t>> outputs(1, output);
return blackball_worker(outputs, BLACKBALL_UNBLACKBALL);
}
bool ringdb::blackballed(const std::pair<uint64_t, uint64_t> &output)
{
std::vector<std::pair<uint64_t, uint64_t>> outputs(1, output);
return blackball_worker(outputs, BLACKBALL_QUERY);
}
bool ringdb::clear_blackballs()
{
return blackball_worker(std::vector<std::pair<uint64_t, uint64_t>>(), BLACKBALL_CLEAR);
}
}
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