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mysql_connection.cc
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1// Copyright (C) 2012-2025 Internet Systems Consortium, Inc. ("ISC")
2//
3// This Source Code Form is subject to the terms of the Mozilla Public
4// License, v. 2.0. If a copy of the MPL was not distributed with this
5// file, You can obtain one at http://mozilla.org/MPL/2.0/.
6
7#include <config.h>
8
9#include <asiolink/io_service.h>
10#include <asiolink/process_spawn.h>
11#include <cc/default_credentials.h>
12#include <database/database_connection.h>
13#include <database/db_log.h>
14#include <exceptions/exceptions.h>
15#include <mysql/mysql_connection.h>
16#include <util/filesystem.h>
17
18#include <boost/lexical_cast.hpp>
19
20#include <cstdint>
21#include <exception>
22#include <limits>
23#include <string>
24#include <unordered_map>
25
26 using namespace isc;
27 using namespace isc::asiolink;
28 using namespace isc::data;
29 using namespace std;
30
31 namespace isc {
32 namespace db {
33
34std::string MySqlConnection::KEA_ADMIN_ = KEA_ADMIN;
35
36 int MySqlHolder::atexit_ = [] {
37 return atexit([] { mysql_library_end(); });
38}();
39
41 const int MYSQL_DEFAULT_CONNECTION_TIMEOUT = 5; // seconds
42
43 MySqlTransaction::MySqlTransaction(MySqlConnection& conn)
44 : conn_(conn), committed_(false) {
45 conn_.startTransaction();
46}
47
48 MySqlTransaction::~MySqlTransaction() {
49 // Rollback if the MySqlTransaction::commit wasn't explicitly
50 // called.
51 if (!committed_) {
52 conn_.rollback();
53 }
54}
55
56 void
57 MySqlTransaction::commit() {
58 conn_.commit();
59 committed_ = true;
60}
61
62// Open the database using the parameters passed to the constructor.
63
64 void
65 MySqlConnection::openDatabase() {
66 // Set up the values of the parameters
67 const char* host = "localhost";
68 string shost;
69 try {
70 shost = getParameter("host");
71 host = shost.c_str();
72 } catch (...) {
73 // No host. Fine, we'll use "localhost"
74 }
75
76 unsigned int port = 0;
77 try {
78 setIntParameterValue("port", 0, numeric_limits<uint16_t>::max(), port);
79
80 } catch (const std::exception& ex) {
81 isc_throw(DbInvalidPort, ex.what());
82 }
83
84 const char* user = NULL;
85 string suser;
86 try {
87 suser = getParameter("user");
88 user = suser.c_str();
89 } catch (...) {
90 // No user. Fine, we'll use NULL
91 }
92
93 const char* password = NULL;
94 string spassword;
95 try {
96 spassword = getParameter("password");
97 password = spassword.c_str();
98 } catch (...) {
99 // No password. Fine, we'll use NULL
100 }
101 if (password) {
102 // Refuse default password.
103 DefaultCredentials::check(spassword);
104 }
105
106 const char* name = NULL;
107 string sname;
108 try {
109 sname = getParameter("name");
110 name = sname.c_str();
111 } catch (...) {
112 // No database name. Throw a "NoName" exception
113 isc_throw(NoDatabaseName, "must specify a name for the database");
114 }
115
116 unsigned int connect_timeout = MYSQL_DEFAULT_CONNECTION_TIMEOUT;
117 unsigned int read_timeout = 0;
118 unsigned int write_timeout = 0;
119 try {
120 // The timeout is only valid if greater than zero, as depending on the
121 // database, a zero timeout might signify something like "wait
122 // indefinitely".
123 setIntParameterValue("connect-timeout", 1, numeric_limits<int>::max(), connect_timeout);
124 // Other timeouts can be 0, meaning that the database client will follow a default
125 // behavior. Earlier MySQL versions didn't have these parameters, so we allow 0
126 // to skip setting them.
127 setIntParameterValue("read-timeout", 0, numeric_limits<int>::max(), read_timeout);
128 setIntParameterValue("write-timeout", 0, numeric_limits<int>::max(), write_timeout);
129
130 } catch (const std::exception& ex) {
131 isc_throw(DbInvalidTimeout, ex.what());
132 }
133
134 const char* ca_file(0);
135 const char* ca_dir(0);
136 string sca;
137 try {
138 sca = getParameter("trust-anchor");
139 tls_ = true;
140 if (util::file::isDir(sca)) {
141 ca_dir = sca.c_str();
142 } else {
143 ca_file = sca.c_str();
144 }
145 } catch (...) {
146 // No trust anchor
147 }
148
149 const char* cert_file(0);
150 string scert;
151 try {
152 scert = getParameter("cert-file");
153 tls_ = true;
154 cert_file = scert.c_str();
155 } catch (...) {
156 // No client certificate file
157 }
158
159 const char* key_file(0);
160 string skey;
161 try {
162 skey = getParameter("key-file");
163 tls_ = true;
164 key_file = skey.c_str();
165 } catch (...) {
166 // No private key file
167 }
168
169 const char* cipher_list(0);
170 string scipher;
171 try {
172 scipher = getParameter("cipher-list");
173 tls_ = true;
174 cipher_list = scipher.c_str();
175 } catch (...) {
176 // No cipher list
177 }
178
179 // Set options for the connection:
180 //
181 int result;
182#ifdef HAS_MYSQL_OPT_RECONNECT
183 // Though still supported by Mariadb (as of 11.5.0), MYSQL_OPT_RECONNECT is
184 // deprecated as of MySQL 8.0.34. Where it is still supported we should
185 // continue to ensure it is off. Enabling it leaves us with an unusable
186 // connection after a reconnect as among other things, it drops all our
187 // pre-compiled statements.
188 my_bool auto_reconnect = MLM_FALSE;
189 result = mysql_options(mysql_, MYSQL_OPT_RECONNECT, &auto_reconnect);
190 if (result != 0) {
191 isc_throw(DbOpenError, "unable to set auto-reconnect option: " <<
192 mysql_error(mysql_));
193 }
194#endif
195
196 // Make sure we have a large idle time window ... say 30 days...
197 const char *wait_time = "SET SESSION wait_timeout = 30 * 86400";
198 result = mysql_options(mysql_, MYSQL_INIT_COMMAND, wait_time);
199 if (result != 0) {
200 isc_throw(DbOpenError, "unable to set wait_timeout " <<
201 mysql_error(mysql_));
202 }
203
204 // Set SQL mode options for the connection: SQL mode governs how what
205 // constitutes insertable data for a given column, and how to handle
206 // invalid data. We want to ensure we get the strictest behavior and
207 // to reject invalid data with an error.
208 const char *sql_mode = "SET SESSION sql_mode ='STRICT_ALL_TABLES'";
209 result = mysql_options(mysql_, MYSQL_INIT_COMMAND, sql_mode);
210 if (result != 0) {
211 isc_throw(DbOpenError, "unable to set SQL mode options: " <<
212 mysql_error(mysql_));
213 }
214
215 // Connection timeout, the amount of time taken for the client to drop
216 // the connection if the server is not responding.
217 result = mysql_options(mysql_, MYSQL_OPT_CONNECT_TIMEOUT, &connect_timeout);
218 if (result != 0) {
219 isc_throw(DbOpenError, "unable to set database connection timeout: " <<
220 mysql_error(mysql_));
221 }
222
223 // Set the read timeout if it has been specified. Otherwise, the timeout is
224 // not used.
225 if (read_timeout > 0) {
226 result = mysql_options(mysql_, MYSQL_OPT_READ_TIMEOUT, &read_timeout);
227 if (result != 0) {
228 isc_throw(DbOpenError, "unable to set database read timeout: " <<
229 mysql_error(mysql_));
230 }
231 }
232
233 // Set the write timeout if it has been specified. Otherwise, the timeout
234 // is not used.
235 if (write_timeout > 0) {
236 result = mysql_options(mysql_, MYSQL_OPT_WRITE_TIMEOUT, &write_timeout);
237 if (result != 0) {
238 isc_throw(DbOpenError, "unable to set database write timeout: " <<
239 mysql_error(mysql_));
240 }
241 }
242
243 // If TLS is enabled set it. If something should go wrong it will happen
244 // later at the mysql_real_connect call.
245 if (tls_) {
246 result = mysql_options(mysql_, MYSQL_OPT_SSL_KEY, key_file);
247 if (result != 0) {
248 isc_throw(DbOpenError, "unable to set key: " << mysql_error(mysql_));
249 }
250
251 result = mysql_options(mysql_, MYSQL_OPT_SSL_CERT, cert_file);
252 if (result != 0) {
253 isc_throw(DbOpenError, "unable to set certificate: " << mysql_error(mysql_));
254 }
255
256 result = mysql_options(mysql_, MYSQL_OPT_SSL_CA, ca_file);
257 if (result != 0) {
258 isc_throw(DbOpenError, "unable to set CA: " << mysql_error(mysql_));
259 }
260
261 result = mysql_options(mysql_, MYSQL_OPT_SSL_CAPATH, ca_dir);
262 if (result != 0) {
263 isc_throw(DbOpenError, "unable to set CA path: " << mysql_error(mysql_));
264 }
265
266 result = mysql_options(mysql_, MYSQL_OPT_SSL_CIPHER, cipher_list);
267 if (result != 0) {
268 isc_throw(DbOpenError, "unable to set cipher: " << mysql_error(mysql_));
269 }
270 }
271
272 // Open the database.
273 //
274 // The option CLIENT_FOUND_ROWS is specified so that in an UPDATE,
275 // the affected rows are the number of rows found that match the
276 // WHERE clause of the SQL statement, not the rows changed. The reason
277 // here is that MySQL apparently does not update a row if data has not
278 // changed and so the "affected rows" (retrievable from MySQL) is zero.
279 // This makes it hard to distinguish whether the UPDATE changed no rows
280 // because no row matching the WHERE clause was found, or because a
281 // row was found but no data was altered.
282 MYSQL* status = mysql_real_connect(mysql_, host, user, password, name,
283 port, NULL, CLIENT_FOUND_ROWS);
284 if (status != mysql_) {
285 // Mark this connection as no longer usable.
286 markUnusable();
287
288 std::string error_message = mysql_error(mysql_);
289
290 auto const& rec = reconnectCtl();
291 if (rec && DatabaseConnection::retry_) {
292
293 // Start the connection recovery.
294 startRecoverDbConnection();
295
296 std::ostringstream s;
297
298 s << " (scheduling retry " << rec->retryIndex() + 1 << " of " << rec->maxRetries() << " in " << rec->retryInterval() << " milliseconds)";
299
300 error_message += s.str();
301
302 isc_throw(DbOpenErrorWithRetry, error_message);
303 }
304
305 isc_throw(DbOpenError, error_message);
306 }
307
308 // Enable autocommit. In case transaction is explicitly used, this
309 // setting will be overwritten for the transaction. However, there are
310 // cases when lack of autocommit could cause transactions to hang
311 // until commit or rollback is explicitly called. This already
312 // caused issues for some unit tests which were unable to cleanup
313 // the database after the test because of pending transactions.
314 // Use of autocommit will eliminate this problem.
315 my_bool autocommit_result = mysql_autocommit(mysql_, 1);
316 if (autocommit_result != 0) {
317 isc_throw(DbOperationError, mysql_error(mysql_));
318 }
319
320 // To avoid a flush to disk on every commit, the global parameter
321 // innodb_flush_log_at_trx_commit should be set to 2. This will cause the
322 // changes to be written to the log, but flushed to disk in the background
323 // every second. Setting the parameter to that value will speed up the
324 // system, but at the risk of losing data if the system crashes.
325}
326
327// Get schema version.
328
329std::pair<uint32_t, uint32_t>
330 MySqlConnection::getVersion(const ParameterMap& parameters,
331 const IOServiceAccessorPtr& ac,
332 const DbCallback& cb,
333 const string& timer_name,
334 unsigned int id) {
335 // Get a connection.
336 MySqlConnection conn(parameters, ac, cb);
337
338 if (!timer_name.empty()) {
339 conn.makeReconnectCtl(timer_name, id);
340 }
341
342 // Open the database.
343 conn.openDatabase();
344
345 // Allocate a new statement.
346 MYSQL_STMT *stmt = mysql_stmt_init(conn.mysql_);
347 if (stmt == NULL) {
348 isc_throw(DbOperationError, "unable to allocate MySQL prepared "
349 "statement structure, reason: " << mysql_error(conn.mysql_));
350 }
351
352 try {
353
354 // Prepare the statement from SQL text.
355 const char* version_sql = "SELECT version, minor FROM schema_version";
356 int status = mysql_stmt_prepare(stmt, version_sql, strlen(version_sql));
357 if (status != 0) {
358 isc_throw(DbOperationError, "unable to prepare MySQL statement <"
359 << version_sql << ">, reason: "
360 << mysql_error(conn.mysql_));
361 }
362
363 // Execute the prepared statement.
364 if (MysqlExecuteStatement(stmt) != 0) {
365 isc_throw(DbOperationError, "cannot execute schema version query <"
366 << version_sql << ">, reason: "
367 << mysql_errno(conn.mysql_));
368 }
369
370 // Bind the output of the statement to the appropriate variables.
371 MYSQL_BIND bind[2];
372 memset(bind, 0, sizeof(bind));
373
374 uint32_t version;
375 bind[0].buffer_type = MYSQL_TYPE_LONG;
376 bind[0].is_unsigned = 1;
377 bind[0].buffer = &version;
378 bind[0].buffer_length = sizeof(version);
379
380 uint32_t minor;
381 bind[1].buffer_type = MYSQL_TYPE_LONG;
382 bind[1].is_unsigned = 1;
383 bind[1].buffer = &minor;
384 bind[1].buffer_length = sizeof(minor);
385
386 if (mysql_stmt_bind_result(stmt, bind)) {
387 isc_throw(DbOperationError, "unable to bind result set for <"
388 << version_sql << ">, reason: "
389 << mysql_errno(conn.mysql_));
390 }
391
392 // Fetch the data.
393 if (mysql_stmt_fetch(stmt)) {
394 isc_throw(DbOperationError, "unable to bind result set for <"
395 << version_sql << ">, reason: "
396 << mysql_errno(conn.mysql_));
397 }
398
399 // Discard the statement and its resources
400 mysql_stmt_close(stmt);
401 return (std::make_pair(version, minor));
402
403 } catch (const std::exception&) {
404 // Avoid a memory leak on error.
405 mysql_stmt_close(stmt);
406
407 // Send the exception to the caller.
408 throw;
409 }
410}
411
412 void
413 MySqlConnection::ensureSchemaVersion(const ParameterMap& parameters,
414 const DbCallback& cb,
415 const string& timer_name) {
416 // retry-on-startup?
417 bool const retry(parameters.count("retry-on-startup") &&
418 parameters.at("retry-on-startup") == "true");
419
420 IOServiceAccessorPtr ac(new IOServiceAccessor(&DatabaseConnection::getIOService));
421 pair<uint32_t, uint32_t> schema_version;
422 try {
423 schema_version = getVersion(parameters, ac, cb, retry ? timer_name : string());
424 } catch (DbOpenError const& exception) {
425 throw;
426 } catch (DbOpenErrorWithRetry const& exception) {
427 throw;
428 } catch (exception const& exception) {
429 // Disable the recovery mechanism in test mode.
430 if (DatabaseConnection::test_mode_) {
431 throw;
432 }
433 // This failure may occur for a variety of reasons. We are looking at
434 // initializing schema as the only potential mitigation. We could narrow
435 // down on the error that would suggest an uninitialized schema
436 // which would sound something along the lines of
437 // "table schema_version does not exist", but we do not necessarily have
438 // to. If the error had another cause, it will fail again during
439 // initialization or during the subsequent version retrieval and that is
440 // fine, and the error should still be relevant.
441 initializeSchema(parameters);
442
443 // Retrieve again because the initial retrieval failed.
444 schema_version = getVersion(parameters, ac, cb, retry ? timer_name : string());
445 }
446
447 // Check that the versions match.
448 pair<uint32_t, uint32_t> const expected_version(MYSQL_SCHEMA_VERSION_MAJOR,
449 MYSQL_SCHEMA_VERSION_MINOR);
450 if (schema_version != expected_version) {
451 isc_throw(DbOpenError, "MySQL schema version mismatch: expected version: "
452 << expected_version.first << "." << expected_version.second
453 << ", found version: " << schema_version.first << "."
454 << schema_version.second);
455 }
456}
457
458 void
459 MySqlConnection::initializeSchema(const ParameterMap& parameters) {
460 if (parameters.count("readonly") && parameters.at("readonly") == "true") {
461 // The readonly flag is historically used for host backends. Still, if
462 // enabled, it is a strong indication that we should not meDDLe with it.
463 return;
464 }
465
466 if (!isc::util::file::isFile(KEA_ADMIN_)) {
467 // It can happen for kea-admin to not exist, especially with
468 // packages that install it in a separate package.
469 return;
470 }
471
472 // Convert parameters.
473 vector<string> kea_admin_parameters(toKeaAdminParameters(parameters));
474 ProcessEnvVars const vars;
475 kea_admin_parameters.insert(kea_admin_parameters.begin(), "db-init");
476
477 // Run.
478 ProcessSpawn kea_admin(ProcessSpawn::SYNC, KEA_ADMIN_, kea_admin_parameters, vars,
479 /* inherit_env = */ true);
480 DB_LOG_INFO(MYSQL_INITIALIZE_SCHEMA).arg(kea_admin.getCommandLine());
481 pid_t const pid(kea_admin.spawn());
482 if (kea_admin.isRunning(pid)) {
483 isc_throw(SchemaInitializationFailed, "kea-admin still running");
484 }
485 int const exit_code(kea_admin.getExitStatus(pid));
486 if (exit_code != 0) {
487 isc_throw(SchemaInitializationFailed, "Expected exit code 0 for kea-admin. Got " << exit_code);
488 }
489}
490
491vector<string>
492 MySqlConnection::toKeaAdminParameters(ParameterMap const& params) {
493 vector<string> result{"mysql"};
494 for (auto const& p : params) {
495 string const& keyword(p.first);
496 string const& value(p.second);
497
498 // These Kea parameters are the same as the kea-admin parameters.
499 if (keyword == "user" ||
500 keyword == "password" ||
501 keyword == "host" ||
502 keyword == "port" ||
503 keyword == "name") {
504 result.push_back("--" + keyword);
505 result.push_back(value);
506 continue;
507 }
508
509 // These Kea parameters do not have a direct kea-admin equivalent.
510 // But they do have a mariadb client flag equivalent.
511 // We pass them to kea-admin using the --extra flag.
512 static unordered_map<string, string> conversions{
513 {"connect-timeout", "connect_timeout"},
514 {"cipher-list", "ssl-cipher"},
515 {"cert-file", "ssl-cert"},
516 {"key-file", "ssl-key"},
517 {"trust-anchor", "ssl-ca"},
518 // {"read-timeout", "--net-read-timeout"}, // available in docs, but client says unknown variable?
519 // {"write-timeout", "--net-write-timeout"}, // available in docs, but client says unknown variable?
520 };
521 if (conversions.count(keyword)) {
522 result.push_back("--extra");
523 result.push_back("--" + conversions.at(keyword) + " " + value);
524 }
525 }
526 return result;
527}
528
529// Prepared statement setup. The textual form of an SQL statement is stored
530// in a vector of strings (text_statements_) and is used in the output of
531// error messages. The SQL statement is also compiled into a "prepared
532// statement" (stored in statements_), which avoids the overhead of compilation
533// during use. As prepared statements have resources allocated to them, the
534// class destructor explicitly destroys them.
535
536 void
537 MySqlConnection::prepareStatement(uint32_t index, const char* text) {
538 // Validate that there is space for the statement in the statements array
539 // and that nothing has been placed there before.
540 if ((index >= statements_.size()) || (statements_[index] != NULL)) {
541 isc_throw(InvalidParameter, "invalid prepared statement index (" <<
542 static_cast<int>(index) << ") or indexed prepared " <<
543 "statement is not null");
544 }
545
546 // All OK, so prepare the statement
547 text_statements_[index] = std::string(text);
548 statements_[index] = mysql_stmt_init(mysql_);
549 if (statements_[index] == NULL) {
550 isc_throw(DbOperationError, "unable to allocate MySQL prepared "
551 "statement structure, reason: " << mysql_error(mysql_));
552 }
553
554 int status = mysql_stmt_prepare(statements_[index], text, strlen(text));
555 if (status != 0) {
556 isc_throw(DbOperationError, "unable to prepare MySQL statement <" <<
557 text << ">, reason: " << mysql_error(mysql_));
558 }
559}
560
561 void
562 MySqlConnection::prepareStatements(const TaggedStatement* start_statement,
563 const TaggedStatement* end_statement) {
564 // Created the MySQL prepared statements for each DML statement.
565 for (const TaggedStatement* tagged_statement = start_statement;
566 tagged_statement != end_statement; ++tagged_statement) {
567 if (tagged_statement->index >= statements_.size()) {
568 statements_.resize(tagged_statement->index + 1, NULL);
569 text_statements_.resize(tagged_statement->index + 1,
570 std::string(""));
571 }
572 prepareStatement(tagged_statement->index,
573 tagged_statement->text);
574 }
575}
576
578 MySqlConnection::~MySqlConnection() {
579 // Free up the prepared statements, ignoring errors. (What would we do
580 // about them? We're destroying this object and are not really concerned
581 // with errors on a database connection that is about to go away.)
582 for (size_t i = 0; i < statements_.size(); ++i) {
583 if (statements_[i] != NULL) {
584 (void) mysql_stmt_close(statements_[i]);
585 statements_[i] = NULL;
586 }
587 }
588 statements_.clear();
589 text_statements_.clear();
590}
591
592// Time conversion methods.
593//
594// Note that the MySQL TIMESTAMP data type (used for "expire") converts data
595// from the current timezone to UTC for storage, and from UTC to the current
596// timezone for retrieval.
597//
598// This causes no problems providing that:
599// a) cltt is given in local time
600// b) We let the system take care of timezone conversion when converting
601// from a time read from the database into a local time.
602 void
603 MySqlConnection::convertToDatabaseTime(const time_t input_time,
604 MYSQL_TIME& output_time) {
605 MySqlBinding::convertToDatabaseTime(input_time, output_time);
606}
607
608 void
609 MySqlConnection::convertToDatabaseTime(const time_t cltt,
610 const uint32_t valid_lifetime,
611 MYSQL_TIME& expire) {
612 MySqlBinding::convertToDatabaseTime(cltt, valid_lifetime, expire);
613}
614
615 void
616 MySqlConnection::convertFromDatabaseTime(const MYSQL_TIME& expire,
617 uint32_t valid_lifetime, time_t& cltt) {
618 MySqlBinding::convertFromDatabaseTime(expire, valid_lifetime, cltt);
619}
620
621 void
622 MySqlConnection::startTransaction() {
623 // If it is nested transaction, do nothing.
624 if (++transaction_ref_count_ > 1) {
625 return;
626 }
627
628 DB_LOG_DEBUG(DB_DBG_TRACE_DETAIL, MYSQL_START_TRANSACTION);
629 checkUnusable();
630 // We create prepared statements for all other queries, but MySQL
631 // don't support prepared statements for START TRANSACTION.
632 int status = mysql_query(mysql_, "START TRANSACTION");
633 if (status != 0) {
634 isc_throw(DbOperationError, "unable to start transaction, "
635 "reason: " << mysql_error(mysql_));
636 }
637}
638
639 bool
640 MySqlConnection::isTransactionStarted() const {
641 return (transaction_ref_count_ > 0);
642}
643
644 void
645 MySqlConnection::commit() {
646 if (transaction_ref_count_ <= 0) {
647 isc_throw(Unexpected, "commit called for not started transaction - coding error");
648 }
649
650 // When committing nested transaction, do nothing.
651 if (--transaction_ref_count_ > 0) {
652 return;
653 }
654 DB_LOG_DEBUG(DB_DBG_TRACE_DETAIL, MYSQL_COMMIT);
655 checkUnusable();
656 if (mysql_commit(mysql_) != 0) {
657 isc_throw(DbOperationError, "commit failed: "
658 << mysql_error(mysql_));
659 }
660}
661
662 void
663 MySqlConnection::rollback() {
664 if (transaction_ref_count_ <= 0) {
665 isc_throw(Unexpected, "rollback called for not started transaction - coding error");
666 }
667
668 // When rolling back nested transaction, do nothing.
669 if (--transaction_ref_count_ > 0) {
670 return;
671 }
672 DB_LOG_DEBUG(DB_DBG_TRACE_DETAIL, MYSQL_ROLLBACK);
673 checkUnusable();
674 if (mysql_rollback(mysql_) != 0) {
675 isc_throw(DbOperationError, "rollback failed: "
676 << mysql_error(mysql_));
677 }
678}
679
680 template<typename T>
681 void
682MySqlConnection::setIntParameterValue(const std::string& name, int64_t min, int64_t max, T& value) {
683 string svalue;
684 try {
685 svalue = getParameter(name);
686 } catch (...) {
687 // Do nothing if the parameter is not present.
688 }
689 if (svalue.empty()) {
690 return;
691 }
692 try {
693 // Try to convert the value.
694 auto parsed_value = boost::lexical_cast<T>(svalue);
695 // Check if the value is within the specified range.
696 if ((parsed_value < min) || (parsed_value > max)) {
697 isc_throw(BadValue, "bad " << svalue << " value");
698 }
699 // Everything is fine. Return the parsed value.
700 value = parsed_value;
701
702 } catch (...) {
703 // We may end up here when lexical_cast fails or when the
704 // parsed value is not within the desired range. In both
705 // cases let's throw the same general error.
706 isc_throw(BadValue, name << " parameter (" <<
707 svalue << ") must be an integer between "
708 << min << " and " << max);
709 }
710}
711
712} // namespace db
713} // namespace isc
isc::InvalidParameter
A generic exception that is thrown if a parameter given to a method or function is considered invalid...
Definition exceptions/exceptions.h:124
isc::Unexpected
A generic exception that is thrown when an unexpected error condition occurs.
Definition exceptions/exceptions.h:153
isc::asiolink::ProcessSpawn
Utility class for spawning new processes.
Definition process_spawn.h:61
isc::asiolink::ProcessSpawn::getExitStatus
int getExitStatus(const pid_t pid) const
Returns exit status of the process.
Definition process_spawn.cc:512
isc::asiolink::ProcessSpawn::isRunning
bool isRunning(const pid_t pid) const
Checks if the process is still running.
Definition process_spawn.cc:502
isc::asiolink::ProcessSpawn::getCommandLine
std::string getCommandLine() const
Returns full command line, including arguments, for the process.
Definition process_spawn.cc:492
isc::asiolink::ProcessSpawn::spawn
pid_t spawn(bool dismiss=false)
Spawn the new process.
Definition process_spawn.cc:497
isc::asiolink::ProcessSpawn::SYNC
@ SYNC
Definition process_spawn.h:67
isc::db::DatabaseConnection::getParameter
std::string getParameter(const std::string &name) const
Returns value of a connection parameter.
Definition database_connection.cc:32
isc::db::DatabaseConnection::reconnectCtl
util::ReconnectCtlPtr reconnectCtl()
The reconnect settings.
Definition database_connection.h:162
isc::db::DatabaseConnection::makeReconnectCtl
virtual void makeReconnectCtl(const std::string &timer_name, unsigned int id)
Instantiates a ReconnectCtl based on the connection's reconnect parameters.
Definition database_connection.cc:155
isc::db::DatabaseConnection::markUnusable
void markUnusable()
Sets the unusable flag to true.
Definition database_connection.h:302
isc::db::DatabaseConnection::test_mode_
static bool test_mode_
Test mode flag (default false).
Definition database_connection.h:280
isc::db::DatabaseConnection::retry_
static bool retry_
Flag which indicates if the database connection should be retried on fail.
Definition database_connection.h:262
isc::db::DatabaseConnection::checkUnusable
void checkUnusable()
Throws an exception if the connection is not usable.
Definition database_connection.h:266
isc::db::DatabaseConnection::getIOService
static isc::asiolink::IOServicePtr & getIOService()
Returns pointer to the IO service.
Definition database_connection.h:240
isc::db::DatabaseConnection::ParameterMap
std::map< std::string, std::string > ParameterMap
Database configuration parameter map.
Definition database_connection.h:137
isc::db::DbInvalidPort
Invalid port number.
Definition database_connection.h:80
isc::db::DbInvalidTimeout
Invalid Timeout.
Definition database_connection.h:71
isc::db::DbOpenErrorWithRetry
Exception thrown on failure to open database but permit retries.
Definition database_connection.h:38
isc::db::DbOpenError
Exception thrown on failure to open database.
Definition database_connection.h:31
isc::db::DbOperationError
Exception thrown on failure to execute a database function.
Definition database_connection.h:45
isc::db::MySqlBinding::convertFromDatabaseTime
static void convertFromDatabaseTime(const MYSQL_TIME &expire, uint32_t valid_lifetime, time_t &cltt)
Converts Database Time to Lease Times.
Definition mysql_binding.cc:273
isc::db::MySqlBinding::convertToDatabaseTime
static void convertToDatabaseTime(const time_t input_time, MYSQL_TIME &output_time)
Converts time_t value to database time.
Definition mysql_binding.cc:191
isc::db::MySqlConnection
Common MySQL Connector Pool.
Definition mysql_connection.h:235
isc::db::MySqlConnection::KEA_ADMIN_
static std::string KEA_ADMIN_
Holds location to kea-admin.
Definition mysql_connection.h:836
isc::db::MySqlConnection::mysql_
MySqlHolder mysql_
MySQL connection handle.
Definition mysql_connection.h:809
isc::db::MySqlConnection::getVersion
static std::pair< uint32_t, uint32_t > getVersion(const ParameterMap &parameters, const IOServiceAccessorPtr &ac=IOServiceAccessorPtr(), const DbCallback &cb=DbCallback(), const std::string &timer_name=std::string(), unsigned int id=0)
Get the schema version.
Definition mysql_connection.cc:330
isc::db::MySqlConnection::prepareStatement
void prepareStatement(uint32_t index, const char *text)
Prepare Single Statement.
Definition mysql_connection.cc:537
isc::db::MySqlConnection::isTransactionStarted
bool isTransactionStarted() const
Checks if there is a transaction in progress.
Definition mysql_connection.cc:640
isc::db::MySqlConnection::text_statements_
std::vector< std::string > text_statements_
Raw text of statements.
Definition mysql_connection.h:803
isc::db::MySqlConnection::tls_
bool tls_
TLS flag (true when TLS was required, false otherwise).
Definition mysql_connection.h:832
isc::db::MySqlConnection::convertToDatabaseTime
static void convertToDatabaseTime(const time_t input_time, MYSQL_TIME &output_time)
Convert time_t value to database time.
Definition mysql_connection.cc:603
isc::db::MySqlConnection::convertFromDatabaseTime
static void convertFromDatabaseTime(const MYSQL_TIME &expire, uint32_t valid_lifetime, time_t &cltt)
Convert Database Time to Lease Times.
Definition mysql_connection.cc:616
isc::db::MySqlConnection::commit
void commit()
Commits current transaction.
Definition mysql_connection.cc:645
isc::db::MySqlConnection::MySqlConnection
MySqlConnection(const ParameterMap &parameters, IOServiceAccessorPtr io_accessor=IOServiceAccessorPtr(), DbCallback callback=DbCallback())
Constructor.
Definition mysql_connection.h:248
isc::db::MySqlConnection::startRecoverDbConnection
void startRecoverDbConnection()
The recover connection.
Definition mysql_connection.h:744
isc::db::MySqlConnection::initializeSchema
static void initializeSchema(const ParameterMap &parameters)
Initialize schema.
Definition mysql_connection.cc:459
isc::db::MySqlConnection::toKeaAdminParameters
static std::vector< std::string > toKeaAdminParameters(ParameterMap const &params)
Convert MySQL library parameters to kea-admin parameters.
Definition mysql_connection.cc:492
isc::db::MySqlConnection::openDatabase
void openDatabase()
Open Database.
Definition mysql_connection.cc:65
isc::db::MySqlConnection::prepareStatements
void prepareStatements(const TaggedStatement *start_statement, const TaggedStatement *end_statement)
Prepare statements.
Definition mysql_connection.cc:562
isc::db::MySqlConnection::transaction_ref_count_
int transaction_ref_count_
Reference counter for transactions.
Definition mysql_connection.h:829
isc::db::MySqlConnection::startTransaction
void startTransaction()
Starts new transaction.
Definition mysql_connection.cc:622
isc::db::MySqlConnection::~MySqlConnection
virtual ~MySqlConnection()
Destructor.
Definition mysql_connection.cc:578
isc::db::MySqlConnection::rollback
void rollback()
Rollbacks current transaction.
Definition mysql_connection.cc:663
isc::db::MySqlConnection::ensureSchemaVersion
static void ensureSchemaVersion(const ParameterMap &parameters, const DbCallback &cb=DbCallback(), const std::string &timer_name=std::string())
Retrieve schema version, validate it against the hardcoded version, and attempt to initialize the sch...
Definition mysql_connection.cc:413
isc::db::MySqlTransaction::~MySqlTransaction
~MySqlTransaction()
Destructor.
Definition mysql_connection.cc:48
isc::db::MySqlTransaction::commit
void commit()
Commits transaction.
Definition mysql_connection.cc:57
isc::db::MySqlTransaction::MySqlTransaction
MySqlTransaction(MySqlConnection &conn)
Constructor.
Definition mysql_connection.cc:43
isc::db::NoDatabaseName
Exception thrown if name of database is not specified.
Definition database_connection.h:24
isc::db::SchemaInitializationFailed
Thrown when an initialization of the schema failed.
Definition database_connection.h:96
version
int version()
returns Kea hooks version.
Definition d2/gss_tsig/version.cc:13
database_connection.h
db_log.h
We want to reuse the database backend connection and exchange code for other uses,...
default_credentials.h
exceptions.h
isc_throw
#define isc_throw(type, stream)
A shortcut macro to insert known values into exception arguments.
Definition exceptions/exceptions.h:210
filesystem.h
io_service.h
mysql_connection.h
isc::asiolink
Definition addr_utilities.cc:170
isc::asiolink::ProcessEnvVars
std::vector< std::string > ProcessEnvVars
Type of the container holding environment variables of the executable being run as a background proce...
Definition process_spawn.h:41
isc::cb
Definition base_config_backend.h:18
isc::data
Definition base_stamped_element.cc:12
isc::db
Definition audit_entry.cc:14
isc::db::DB_DBG_TRACE_DETAIL
const int DB_DBG_TRACE_DETAIL
Database logging levels.
Definition db_log.cc:21
isc::db::MLM_FALSE
const my_bool MLM_FALSE
MySQL false value.
Definition mysql_constants.h:36
isc::db::MYSQL_DEFAULT_CONNECTION_TIMEOUT
const int MYSQL_DEFAULT_CONNECTION_TIMEOUT
Definition mysql_connection.cc:41
isc::db::MYSQL_START_TRANSACTION
@ MYSQL_START_TRANSACTION
Definition db_log.h:66
isc::db::MYSQL_INITIALIZE_SCHEMA
@ MYSQL_INITIALIZE_SCHEMA
Definition db_log.h:64
isc::db::MYSQL_ROLLBACK
@ MYSQL_ROLLBACK
Definition db_log.h:68
isc::db::MYSQL_COMMIT
@ MYSQL_COMMIT
Definition db_log.h:67
isc::db::MYSQL_SCHEMA_VERSION_MAJOR
const uint32_t MYSQL_SCHEMA_VERSION_MAJOR
Definition mysql_constants.h:55
isc::db::IOServiceAccessorPtr
boost::shared_ptr< IOServiceAccessor > IOServiceAccessorPtr
Pointer to an instance of IOServiceAccessor.
Definition database_connection.h:115
isc::db::MYSQL_SCHEMA_VERSION_MINOR
const uint32_t MYSQL_SCHEMA_VERSION_MINOR
Definition mysql_constants.h:56
isc::db::my_bool
bool my_bool
my_bool type in MySQL 8.x.
Definition mysql_constants.h:33
isc::db::DbCallback
std::function< bool(util::ReconnectCtlPtr db_reconnect_ctl)> DbCallback
Defines a callback prototype for propagating events upward.
Definition database_connection.h:103
isc::db::IOServiceAccessor
std::function< isc::asiolink::IOServicePtr()> IOServiceAccessor
Function which returns the IOService that can be used to recover the connection.
Definition database_connection.h:112
isc::db::MysqlExecuteStatement
int MysqlExecuteStatement(MYSQL_STMT *stmt)
Execute a prepared statement.
Definition mysql_connection.h:106
isc::util::file::isFile
bool isFile(string const &path)
Check if there is a file at the given path.
Definition filesystem.cc:79
isc::util::file::isDir
bool isDir(string const &path)
Check if there is a directory at the given path.
Definition filesystem.cc:70
isc
Defines the logger used by the top-level component of kea-lfc.
Definition agent_parser.cc:148
process_spawn.h
isc::data::DefaultCredentials::check
static void check(const std::string &value)
Check if the value is a default credential.
Definition default_credentials.cc:27
isc::db::DB_LOG_DEBUG
Definition db_log.h:201
isc::db::DB_LOG_INFO
Definition db_log.h:196
isc::db::DB_LOG::arg
DB_LOG & arg(T first, Args... args)
Pass parameters to replace logger placeholders.
Definition db_log.h:144
isc::db::TaggedStatement
MySQL Selection Statements.
Definition mysql_connection.h:74