tdlight/tddb/td/db/SqliteDb.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/db/SqliteDb.h"
#include "td/utils/format.h"
#include "td/utils/port/path.h"
#include "td/utils/port/Stat.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include "td/utils/Timer.h"
#include "sqlite/sqlite3.h"
namespace td {
namespace {
string db_key_to_sqlcipher_key(const DbKey &db_key) {
if (db_key.is_empty()) {
return "''";
}
if (db_key.is_password()) {
return PSTRING() << "'" << db_key.data().str() << "'";
}
CHECK(db_key.is_raw_key());
Slice raw_key = db_key.data();
CHECK(raw_key.size() == 32);
size_t expected_size = 64 + 5;
string res(expected_size + 50, ' ');
StringBuilder sb(res);
sb << '"';
sb << 'x';
sb << '\'';
sb << format::as_hex_dump<0>(raw_key);
sb << '\'';
sb << '"';
CHECK(!sb.is_error());
CHECK(sb.as_cslice().size() == expected_size);
res.resize(expected_size);
return res;
}
} // namespace
SqliteDb::~SqliteDb() = default;
Status SqliteDb::init(CSlice path, bool *was_created) {
// If database does not exist, delete all other files which may left
// from older database
bool is_db_exists = stat(path).is_ok();
if (!is_db_exists) {
TRY_STATUS(destroy(path));
}
if (was_created != nullptr) {
*was_created = !is_db_exists;
}
sqlite3 *db;
CHECK(sqlite3_threadsafe() != 0);
int rc = sqlite3_open_v2(path.c_str(), &db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE /*| SQLITE_OPEN_SHAREDCACHE*/,
nullptr);
if (rc != SQLITE_OK) {
auto res = Status::Error(PSLICE() << "Failed to open database: " << detail::RawSqliteDb::last_error(db));
sqlite3_close(db);
return res;
}
sqlite3_busy_timeout(db, 1000 * 5 /* 5 seconds */);
raw_ = std::make_shared<detail::RawSqliteDb>(db, path.str());
return Status::OK();
}
static void trace_callback(void *ptr, const char *query) {
LOG(ERROR) << query;
}
static int trace_v2_callback(unsigned code, void *ctx, void *p_raw, void *x_raw) {
CHECK(code == SQLITE_TRACE_STMT);
auto x = static_cast<const char *>(x_raw);
if (x[0] == '-' && x[1] == '-') {
trace_callback(ctx, x);
} else {
trace_callback(ctx, sqlite3_expanded_sql(static_cast<sqlite3_stmt *>(p_raw)));
}
return 0;
}
void SqliteDb::trace(bool flag) {
sqlite3_trace_v2(raw_->db(), SQLITE_TRACE_STMT, flag ? trace_v2_callback : nullptr, nullptr);
}
Status SqliteDb::exec(CSlice cmd) {
CHECK(!empty());
char *msg;
VLOG(sqlite) << "Start exec " << tag("query", cmd) << tag("database", raw_->db());
auto rc = sqlite3_exec(raw_->db(), cmd.c_str(), nullptr, nullptr, &msg);
VLOG(sqlite) << "Finish exec " << tag("query", cmd) << tag("database", raw_->db());
if (rc != SQLITE_OK) {
CHECK(msg != nullptr);
return Status::Error(PSLICE() << tag("query", cmd) << " failed: " << msg);
}
CHECK(msg == nullptr);
return Status::OK();
}
Result<bool> SqliteDb::has_table(Slice table) {
TRY_RESULT(stmt, get_statement(PSLICE() << "SELECT count(*) FROM sqlite_master WHERE type='table' AND name='" << table
<< "'"));
TRY_STATUS(stmt.step());
CHECK(stmt.has_row());
auto cnt = stmt.view_int32(0);
return cnt == 1;
}
Result<string> SqliteDb::get_pragma(Slice name) {
TRY_RESULT(stmt, get_statement(PSLICE() << "PRAGMA " << name));
TRY_STATUS(stmt.step());
CHECK(stmt.has_row());
auto res = stmt.view_blob(0).str();
TRY_STATUS(stmt.step());
CHECK(!stmt.can_step());
return std::move(res);
}
Result<int32> SqliteDb::user_version() {
TRY_RESULT(get_version_stmt, get_statement("PRAGMA user_version"));
TRY_STATUS(get_version_stmt.step());
if (!get_version_stmt.has_row()) {
return Status::Error("PRAGMA user_version failed");
}
return get_version_stmt.view_int32(0);
}
Status SqliteDb::set_user_version(int32 version) {
return exec(PSLICE() << "PRAGMA user_version = " << version);
}
Status SqliteDb::begin_transaction() {
return exec("BEGIN");
}
Status SqliteDb::commit_transaction() {
return exec("COMMIT");
}
bool SqliteDb::is_encrypted() {
return exec("SELECT count(*) FROM sqlite_master").is_error();
}
Result<SqliteDb> SqliteDb::open_with_key(CSlice path, const DbKey &db_key) {
SqliteDb db;
TRY_STATUS(db.init(path));
if (!db_key.is_empty()) {
if (!db.is_encrypted()) {
return Status::Error("No key is needed");
}
auto key = db_key_to_sqlcipher_key(db_key);
TRY_STATUS(db.exec(PSLICE() << "PRAGMA key = " << key));
}
if (db.is_encrypted()) {
return Status::Error("Wrong key or database is corrupted");
}
return std::move(db);
}
Status SqliteDb::change_key(CSlice path, const DbKey &new_db_key, const DbKey &old_db_key) {
// fast path
{
auto r_db = open_with_key(path, new_db_key);
if (r_db.is_ok()) {
return Status::OK();
}
}
TRY_RESULT(db, open_with_key(path, old_db_key));
TRY_RESULT(user_version, db.user_version());
auto new_key = db_key_to_sqlcipher_key(new_db_key);
if (old_db_key.is_empty() && !new_db_key.is_empty()) {
LOG(DEBUG) << "ENCRYPT";
PerfWarningTimer timer("Encrypt SQLite database", 0.1);
auto tmp_path = path.str() + ".ecnrypted";
TRY_STATUS(destroy(tmp_path));
// make shure that database is not empty
TRY_STATUS(db.exec("CREATE TABLE IF NOT EXISTS encryption_dummy_table(id INT PRIMARY KEY)"));
//NB: not really safe
TRY_STATUS(db.exec(PSLICE() << "ATTACH DATABASE '" << tmp_path << "' AS encrypted KEY " << new_key));
TRY_STATUS(db.exec("SELECT sqlcipher_export('encrypted')"));
TRY_STATUS(db.exec(PSLICE() << "PRAGMA encrypted.user_version = " << user_version));
TRY_STATUS(db.exec("DETACH DATABASE encrypted"));
db.close();
TRY_STATUS(rename(tmp_path, path));
} else if (!old_db_key.is_empty() && new_db_key.is_empty()) {
LOG(DEBUG) << "DECRYPT";
PerfWarningTimer timer("Decrypt SQLite database", 0.1);
auto tmp_path = path.str() + ".ecnrypted";
TRY_STATUS(destroy(tmp_path));
//NB: not really safe
TRY_STATUS(db.exec(PSLICE() << "ATTACH DATABASE '" << tmp_path << "' AS decrypted KEY ''"));
TRY_STATUS(db.exec("SELECT sqlcipher_export('decrypted')"));
TRY_STATUS(db.exec(PSLICE() << "PRAGMA decrypted.user_version = " << user_version));
TRY_STATUS(db.exec("DETACH DATABASE decrypted"));
db.close();
TRY_STATUS(rename(tmp_path, path));
} else {
LOG(DEBUG) << "REKEY";
PerfWarningTimer timer("Rekey SQLite database", 0.1);
TRY_STATUS(db.exec(PSLICE() << "PRAGMA rekey = " << new_key));
}
TRY_RESULT(new_db, open_with_key(path, new_db_key));
CHECK(new_db.user_version().ok() == user_version) << new_db.user_version().ok() << " " << user_version;
return Status::OK();
}
Status SqliteDb::destroy(Slice path) {
return detail::RawSqliteDb::destroy(path);
}
Result<SqliteStatement> SqliteDb::get_statement(CSlice statement) {
sqlite3_stmt *stmt = nullptr;
auto rc = sqlite3_prepare_v2(get_native(), statement.c_str(), static_cast<int>(statement.size()) + 1, &stmt, nullptr);
if (rc != SQLITE_OK) {
return Status::Error(PSLICE() << "Failed to prepare SQLite " << tag("statement", statement) << raw_->last_error());
}
CHECK(stmt != nullptr) << statement;
return SqliteStatement(stmt, raw_);
}
} // namespace td