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sql_show.cc
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/* Copyright (c) 2000, 2024, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
// SHOW TABLE, SHOW DATABASES, etc.
#include "sql/sql_show.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <algorithm>
#include <atomic>
#include <functional>
#include <memory>
#include <new>
#include <optional>
#include <string>
#include <vector>
#include "decimal.h"
#include "field_types.h"
#include "keycache.h" // dflt_key_cache
#include "m_ctype.h"
#include "m_string.h"
#include "mutex_lock.h" // MUTEX_LOCK
#include "my_alloc.h"
#include "my_base.h"
#include "my_bitmap.h"
#include "my_command.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_hostname.h"
#include "my_io.h"
#include "my_loglevel.h"
#include "my_macros.h"
#include "my_sqlcommand.h"
#include "my_sys.h"
#include "my_systime.h"
#include "my_thread_local.h"
#include "mysql/components/services/log_builtins.h" // LogErr
#include "mysql/components/services/log_shared.h"
#include "mysql/mysql_lex_string.h"
#include "mysql/plugin.h" // st_mysql_plugin
#include "mysql/psi/mysql_mutex.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/udf_registration_types.h"
#include "mysql_com.h"
#include "mysql_time.h"
#include "mysqld_error.h"
#include "scope_guard.h" // Scope_guard
#include "sql/auth/auth_acls.h" // DB_ACLS
#include "sql/auth/auth_common.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/dd/cache/dictionary_client.h" // dd::cache::Dictionary_client
#include "sql/dd/dd_schema.h" // dd::Schema_MDL_locker
#include "sql/dd/dd_table.h" // is_encrypted
#include "sql/dd/properties.h" // dd::Properties
#include "sql/dd/string_type.h"
#include "sql/dd/types/column.h" // dd::Column
#include "sql/dd/types/foreign_key.h" // dd::Foreign_key
#include "sql/dd/types/foreign_key_element.h" // dd::Foreign_key_element
#include "sql/dd/types/partition.h"
#include "sql/dd/types/partition_index.h"
#include "sql/dd/types/schema.h"
#include "sql/dd/types/table.h" // dd::Table
#include "sql/debug_sync.h" // DEBUG_SYNC
#include "sql/derror.h" // ER_THD
#include "sql/enum_query_type.h"
#include "sql/error_handler.h" // Internal_error_handler
#include "sql/events.h" // Events
#include "sql/field.h" // Field
#include "sql/handler.h"
#include "sql/item.h" // Item_empty_string
#include "sql/key.h"
#include "sql/log.h" // query_logger
#include "sql/mdl.h"
#include "sql/mem_root_array.h"
#include "sql/mysqld.h" // lower_case_table_names
#include "sql/mysqld_thd_manager.h" // Global_THD_manager
#include "sql/opt_trace.h" // fill_optimizer_trace_info
#include "sql/partition_info.h" // partition_info
#include "sql/protocol.h" // Protocol
#include "sql/psi_memory_key.h"
#include "sql/query_options.h"
#include "sql/query_result.h"
#include "sql/rpl_source.h"
#include "sql/set_var.h"
#include "sql/sp.h" // sp_cache_routine
#include "sql/sp_head.h" // sp_head
#include "sql/sql_base.h" // close_thread_tables
#include "sql/sql_bitmap.h"
#include "sql/sql_check_constraint.h"
#include "sql/sql_class.h" // THD
#include "sql/sql_const.h"
#include "sql/sql_db.h" // get_default_db_collation
#include "sql/sql_error.h"
#include "sql/sql_executor.h" // QEP_TAB
#include "sql/sql_gipk.h" // table_has_generated_invisible_primary_key
#include "sql/sql_lex.h" // LEX
#include "sql/sql_list.h"
#include "sql/sql_optimizer.h" // JOIN
#include "sql/sql_parse.h" // command_name
#include "sql/sql_partition.h" // HA_USE_AUTO_PARTITION
#include "sql/sql_plugin.h" // PLUGIN_IS_DELETED, LOCK_plugin
#include "sql/sql_plugin_ref.h"
#include "sql/sql_profile.h" // query_profile_statistics_info
#include "sql/sql_table.h" // primary_key_name
#include "sql/sql_tmp_table.h" // create_ondisk_from_heap
#include "sql/sql_trigger.h" // acquire_shared_mdl_for_trigger
#include "sql/strfunc.h" // lex_string_strmake
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/table_trigger_dispatcher.h" // Table_trigger_dispatcher
#include "sql/temp_table_param.h" // Temp_table_param
#include "sql/thd_raii.h" // Prepared_stmt_arena_holder
#include "sql/trigger.h" // Trigger
#include "sql/tztime.h" // my_tz_SYSTEM
#include "sql_string.h"
#include "template_utils.h"
#include "thr_lock.h"
/* @see dynamic_privileges_table.cc */
bool iterate_all_dynamic_privileges(THD *thd,
std::function<bool(const char *)> action);
using std::max;
using std::min;
/** Count number of times information_schema.processlist has been used. */
std::atomic_ulong deprecated_use_i_s_processlist_count = 0;
/** Last time information_schema.processlist was used, as usec since epoch. */
std::atomic_ullong deprecated_use_i_s_processlist_last_timestamp = 0;
/**
@class CSET_STRING
@brief Character set armed LEX_CSTRING
*/
class CSET_STRING {
private:
LEX_CSTRING string;
const CHARSET_INFO *cs;
public:
CSET_STRING() : cs(&my_charset_bin) {
string.str = nullptr;
string.length = 0;
}
CSET_STRING(const char *str_arg, size_t length_arg,
const CHARSET_INFO *cs_arg)
: cs(cs_arg) {
assert(cs_arg != nullptr);
string.str = str_arg;
string.length = length_arg;
}
inline const char *str() const { return string.str; }
inline size_t length() const { return string.length; }
const CHARSET_INFO *charset() const { return cs; }
};
static const char *grant_names[] = {
"select", "insert", "update", "delete", "create", "drop", "reload",
"shutdown", "process", "file", "grant", "references", "index", "alter"};
TYPELIB grant_types = {sizeof(grant_names) / sizeof(char **), "grant_types",
grant_names, nullptr};
static void store_key_options(THD *thd, String *packet, TABLE *table,
KEY *key_info);
static void get_cs_converted_string_value(THD *thd, String *input_str,
String *output_str,
const CHARSET_INFO *cs, bool use_hex);
static void append_algorithm(Table_ref *table, String *buff);
static void view_store_create_info(const THD *thd, Table_ref *table,
String *buff);
bool Sql_cmd_show::check_privileges(THD *thd) {
// If SHOW command is represented by a plan, ensure user has privileges:
if (lex->query_tables == nullptr) return false;
return check_table_access(thd, SELECT_ACL, lex->query_tables, false, UINT_MAX,
false);
}
bool Sql_cmd_show::execute(THD *thd) {
lex = thd->lex;
if (check_parameters(thd)) {
return true;
}
return Sql_cmd_select::execute(thd);
}
bool Sql_cmd_show_schema_base::set_metadata_lock(THD *thd) {
LEX_STRING lex_str_db;
LEX *lex = thd->lex;
if (lex_string_strmake(thd->mem_root, &lex_str_db, lex->query_block->db,
strlen(lex->query_block->db)))
return true;
// Acquire IX MDL lock on schema name.
MDL_request mdl_request;
MDL_REQUEST_INIT(&mdl_request, MDL_key::SCHEMA, lex_str_db.str, "",
MDL_INTENTION_EXCLUSIVE, MDL_TRANSACTION);
if (thd->mdl_context.acquire_lock(&mdl_request,
thd->variables.lock_wait_timeout))
return true;
return false;
}
bool Sql_cmd_show_schema_base::check_privileges(THD *thd) {
Table_ref *const tables = thd->lex->query_tables;
if (check_table_access(thd, SELECT_ACL, tables, false, UINT_MAX, false))
return true;
const char *dst_db_name = thd->lex->query_block->db;
assert(dst_db_name != nullptr);
// Get user's global and db-level privileges.
ulong global_db_privs;
if (check_access(thd, SELECT_ACL, dst_db_name, &global_db_privs, nullptr,
false, false))
return true;
// Now check, if user has access on global level or to any of database/
// table/column/routine.
if (!(global_db_privs & DB_OP_ACLS) && check_grant_db(thd, dst_db_name)) {
my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
thd->security_context()->priv_user().str,
thd->security_context()->priv_host().str, dst_db_name);
return true;
}
if (set_metadata_lock(thd)) {
return true;
}
return false;
}
bool Sql_cmd_show_schema_base::check_parameters(THD *thd) {
// Check that given database exists.
LEX_STRING lex_str_db;
if (lex_string_strmake(thd->mem_root, &lex_str_db, lex->query_block->db,
strlen(lex->query_block->db)))
return true;
bool exists = false;
if (dd::schema_exists(thd, lex_str_db.str, &exists)) return true;
if (!exists) {
my_error(ER_BAD_DB_ERROR, MYF(0), lex->query_block->db);
return true;
}
return false;
}
bool Sql_cmd_show_table_base::check_privileges(THD *thd) {
Table_ref *const table = thd->lex->query_tables;
if (check_table_access(thd, SELECT_ACL, table, false, UINT_MAX, false))
return true;
Table_ref *dst_table = table->schema_query_block->get_table_list();
assert(dst_table != nullptr);
if (m_temporary) return false;
if (check_access(thd, SELECT_ACL, dst_table->db, &dst_table->grant.privilege,
&dst_table->grant.m_internal, false, false))
return true; /* Access denied */
/*
Check_grant will grant access if there is any column privileges on
all of the tables thanks to the fourth parameter (bool show_table).
*/
if (check_grant(thd, SELECT_ACL, dst_table, true, UINT_MAX, false))
return true; /* Access denied */
return false;
}
bool Sql_cmd_show_binlog_events::check_privileges(THD *thd) {
return check_global_access(thd, REPL_SLAVE_ACL);
}
bool Sql_cmd_show_binlog_events::execute_inner(THD *thd) {
return mysql_show_binlog_events(thd);
}
bool Sql_cmd_show_binlogs::check_privileges(THD *thd) {
return check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL);
}
bool Sql_cmd_show_binlogs::execute_inner(THD *thd) { return show_binlogs(thd); }
bool Sql_cmd_show_create_database::check_privileges(THD *) { return false; }
bool Sql_cmd_show_create_database::execute_inner(THD *thd) {
DBUG_EXECUTE_IF("4x_server_emul", my_error(ER_UNKNOWN_ERROR, MYF(0));
return true;);
if (check_and_convert_db_name(&lex->name, true) != Ident_name_check::OK)
return true;
return mysqld_show_create_db(thd, lex->name.str, lex->create_info);
}
bool Sql_cmd_show_create_event::check_privileges(THD *) { return false; }
bool Sql_cmd_show_create_event::execute_inner(THD *thd) {
return Events::show_create_event(thd, lex->spname->m_db,
to_lex_cstring(lex->spname->m_name));
}
bool Sql_cmd_show_create_function::check_privileges(THD *) { return false; }
bool Sql_cmd_show_create_function::execute_inner(THD *thd) {
return sp_show_create_routine(thd, enum_sp_type::FUNCTION, lex->spname);
}
bool Sql_cmd_show_create_procedure::check_privileges(THD *) { return false; }
bool Sql_cmd_show_create_procedure::execute_inner(THD *thd) {
return sp_show_create_routine(thd, enum_sp_type::PROCEDURE, lex->spname);
}
bool Sql_cmd_show_create_table::check_privileges(THD *) {
// Privilege check for this command is placed in execute_inner() function
return false;
}
bool Sql_cmd_show_create_table::execute_inner(THD *thd) {
// Prepare a local LEX object for expansion of table/view
LEX *old_lex = thd->lex;
LEX local_lex;
Pushed_lex_guard lex_guard(thd, &local_lex);
LEX *lex = thd->lex;
lex->only_view = m_is_view;
lex->sql_command = old_lex->sql_command;
// Disable constant subquery evaluation as we won't be locking tables.
lex->context_analysis_only = CONTEXT_ANALYSIS_ONLY_VIEW;
if (lex->query_block->add_table_to_list(thd, m_table_ident, nullptr, 0) ==
nullptr)
return true;
Table_ref *tbl = lex->query_tables;
/*
Access check:
SHOW CREATE TABLE require any privileges on the table level (ie
effecting all columns in the table).
SHOW CREATE VIEW require the SHOW_VIEW and SELECT ACLs on the table level.
NOTE: SHOW_VIEW ACL is checked when the view is created.
*/
DBUG_PRINT("debug", ("lex->only_view: %d, table: %s.%s", lex->only_view,
tbl->db, tbl->table_name));
if (lex->only_view) {
if (check_table_access(thd, SELECT_ACL, tbl, false, 1, false)) {
DBUG_PRINT("debug", ("check_table_access failed"));
my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0), "SHOW",
thd->security_context()->priv_user().str,
thd->security_context()->host_or_ip().str, tbl->alias);
return true;
}
DBUG_PRINT("debug", ("check_table_access succeeded"));
// Ignore temporary tables if this is "SHOW CREATE VIEW"
tbl->open_type = OT_BASE_ONLY;
} else {
/*
Temporary tables should be opened for SHOW CREATE TABLE, but not
for SHOW CREATE VIEW.
*/
if (open_temporary_tables(thd, tbl)) return true;
/*
The fact that check_some_access() returned false does not mean that
access is granted. We need to check if first_table->grant.privilege
contains any table-specific privilege.
*/
DBUG_PRINT("debug", ("tbl->grant.privilege: %lx", tbl->grant.privilege));
if (check_some_access(thd, TABLE_OP_ACLS, tbl) ||
(tbl->grant.privilege & TABLE_OP_ACLS) == 0) {
my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0), "SHOW",
thd->security_context()->priv_user().str,
thd->security_context()->host_or_ip().str, tbl->alias);
return true;
}
}
if (mysqld_show_create(thd, tbl)) return true;
return false;
}
bool Sql_cmd_show_create_trigger::check_privileges(THD *) { return false; }
bool Sql_cmd_show_create_trigger::execute_inner(THD *thd) {
if (lex->spname->m_name.length > NAME_LEN) {
my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
return true;
}
return show_create_trigger(thd, lex->spname);
}
bool Sql_cmd_show_create_user::check_privileges(THD *) { return false; }
bool Sql_cmd_show_create_user::execute_inner(THD *thd) {
LEX_USER *show_user = get_current_user(thd, lex->grant_user);
Security_context *sctx = thd->security_context();
bool are_both_users_same =
!strcmp(sctx->priv_user().str, show_user->user.str) &&
!my_strcasecmp(system_charset_info, show_user->host.str,
sctx->priv_host().str);
if (are_both_users_same ||
!check_access(thd, SELECT_ACL, "mysql", nullptr, nullptr, true, false))
return mysql_show_create_user(thd, show_user, are_both_users_same);
return false;
}
bool Sql_cmd_show_databases::check_privileges(THD *thd) {
Table_ref *const table = thd->lex->query_tables;
if (check_table_access(thd, SELECT_ACL, table, false, UINT_MAX, false))
return true;
return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
check_global_access(thd, SHOW_DB_ACL);
}
bool Sql_cmd_show_engine_logs::check_privileges(THD *thd) {
return check_access(thd, FILE_ACL, any_db, nullptr, nullptr, false, false);
}
bool Sql_cmd_show_engine_logs::execute_inner(THD *thd) {
return ha_show_status(thd, lex->create_info->db_type, HA_ENGINE_LOGS);
}
bool Sql_cmd_show_engine_mutex::check_privileges(THD *thd) {
return check_global_access(thd, PROCESS_ACL);
}
bool Sql_cmd_show_engine_mutex::execute_inner(THD *thd) {
return ha_show_status(thd, lex->create_info->db_type, HA_ENGINE_MUTEX);
}
bool Sql_cmd_show_engine_status::check_privileges(THD *thd) {
return check_global_access(thd, PROCESS_ACL);
}
bool Sql_cmd_show_engine_status::execute_inner(THD *thd) {
return ha_show_status(thd, lex->create_info->db_type, HA_ENGINE_STATUS);
}
bool Sql_cmd_show_events::check_privileges(THD *thd) {
const char *db = thd->lex->query_block->db;
assert(db != nullptr);
/*
Nobody has EVENT_ACL for I_S and P_S,
even with a GRANT ALL to *.*,
because these schemas have additional ACL restrictions:
see ACL_internal_schema_registry.
Yet there are no events in I_S and P_S to hide either,
so this check voluntarily does not enforce ACL for
SHOW EVENTS in I_S or P_S,
to return an empty list instead of an access denied error.
This is more user friendly, in particular for tools.
EVENT_ACL is not fine grained enough to differentiate:
- creating / updating / deleting events
- viewing existing events
*/
if (!is_infoschema_db(db) && !is_perfschema_db(db) &&
check_access(thd, EVENT_ACL, db, nullptr, nullptr, false, false))
return true;
return Sql_cmd_show_schema_base::check_privileges(thd);
}
bool Sql_cmd_show_grants::check_privileges(THD *) {
// Checked inside Sql_cmd_show_grants::execute_inner()
return false;
}
bool Sql_cmd_show_grants::execute_inner(THD *thd) {
DBUG_TRACE;
bool show_mandatory_roles = (for_user == nullptr);
bool have_using_clause =
(using_users != nullptr && using_users->elements > 0);
if (for_user == nullptr || for_user->user.str == nullptr) {
// SHOW PRIVILEGE FOR CURRENT_USER
LEX_USER current_user;
get_default_definer(thd, ¤t_user);
if (!have_using_clause) {
const List_of_auth_id_refs *active_list =
thd->security_context()->get_active_roles();
return mysql_show_grants(thd, ¤t_user, *active_list,
show_mandatory_roles, have_using_clause);
}
} else if (strcmp(thd->security_context()->priv_user().str,
for_user->user.str) != 0) {
Table_ref table("mysql", "user", nullptr, TL_READ);
if (!is_granted_table_access(thd, SELECT_ACL, &table)) {
char command[128];
get_privilege_desc(command, sizeof(command), SELECT_ACL);
my_error(ER_TABLEACCESS_DENIED_ERROR, MYF(0), command,
thd->security_context()->priv_user().str,
thd->security_context()->host_or_ip().str, "user");
return false;
}
}
List_of_auth_id_refs authid_list;
if (have_using_clause) {
for (const LEX_USER &user : *using_users) {
authid_list.emplace_back(user.user, user.host);
}
}
LEX_USER *tmp_user = const_cast<LEX_USER *>(for_user);
tmp_user = get_current_user(thd, tmp_user);
return mysql_show_grants(thd, tmp_user, authid_list, show_mandatory_roles,
have_using_clause);
}
bool Sql_cmd_show_master_status::check_privileges(THD *thd) {
return check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL);
}
bool Sql_cmd_show_master_status::execute_inner(THD *thd) {
return show_master_status(thd);
}
bool Sql_cmd_show_profiles::execute_inner(THD *thd [[maybe_unused]]) {
#if defined(ENABLED_PROFILING)
thd->profiling->discard_current_query();
return thd->profiling->show_profiles();
#else
my_error(ER_FEATURE_DISABLED, MYF(0), "SHOW PROFILES", "enable-profiling");
return true;
#endif
}
bool Sql_cmd_show_privileges::execute_inner(THD *thd) {
return mysqld_show_privileges(thd);
}
bool Sql_cmd_show_processlist::check_privileges(THD *thd) {
if (!thd->security_context()->priv_user().str[0] &&
check_global_access(thd, PROCESS_ACL))
return true;
return Sql_cmd_show::check_privileges(thd);
}
bool Sql_cmd_show_processlist::execute_inner(THD *thd) {
/*
If the Performance Schema is configured to support SHOW PROCESSLIST,
then execute a query on performance_schema.processlist. Otherwise,
fall back to the legacy method.
*/
if (use_pfs()) {
DEBUG_SYNC(thd, "pfs_show_processlist_performance_schema");
return Sql_cmd_show::execute_inner(thd);
} else {
DEBUG_SYNC(thd, "pfs_show_processlist_legacy");
mysqld_list_processes(thd,
thd->security_context()->check_access(PROCESS_ACL)
? NullS
: thd->security_context()->priv_user().str,
m_verbose, true);
return false;
}
}
bool Sql_cmd_show_relaylog_events::check_privileges(THD *thd) {
return check_global_access(thd, REPL_SLAVE_ACL);
}
bool Sql_cmd_show_relaylog_events::execute_inner(THD *thd) {
return mysql_show_relaylog_events(thd);
}
bool Sql_cmd_show_routine_code::check_privileges(THD *) {
// Actual privilege check is within sp_head::show_routine_code
return false;
}
bool Sql_cmd_show_routine_code::execute_inner(THD *thd) {
#ifndef NDEBUG
enum_sp_type sp_type = m_sql_command == SQLCOM_SHOW_PROC_CODE
? enum_sp_type::PROCEDURE
: enum_sp_type::FUNCTION;
sp_head *sp;
if (sp_cache_routine(thd, sp_type, m_routine_name, false, &sp)) {
return true;
}
if (sp == nullptr || sp->show_routine_code(thd)) {
// Don't distinguish between errors for now */
my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
sp_type == enum_sp_type::PROCEDURE ? "PROCEDURE" : "FUNCTION",
m_routine_name->m_name.str);
return true;
}
return false;
#else
if (thd == nullptr) return false; // To guide an overly eager compiler
my_error(ER_FEATURE_DISABLED, MYF(0), "SHOW PROCEDURE|FUNCTION CODE",
"--with-debug");
return true;
#endif // ifndef NDEBUG
}
bool Sql_cmd_show_replicas::check_privileges(THD *thd) {
return check_global_access(thd, REPL_SLAVE_ACL);
}
bool Sql_cmd_show_replicas::execute_inner(THD *thd) {
return show_replicas(thd);
}
bool Sql_cmd_show_replica_status::check_privileges(THD *thd) {
return check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL);
}
bool Sql_cmd_show_replica_status::execute_inner(THD *thd) {
return show_slave_status_cmd(thd);
}
/**
Try acquire high priority share metadata lock on a table (with
optional wait for conflicting locks to go away).
@param thd Thread context.
@param table Table list element for the table
@param can_deadlock Indicates that deadlocks are possible due to
metadata locks, so to avoid them we should not
wait in case if conflicting lock is present.
@note This is an auxiliary function to be used in cases when we want to
access table's description by looking up info in TABLE_SHARE without
going through full-blown table open.
@note This function assumes that there are no other metadata lock requests
in the current metadata locking context.
@retval false No error, if lock was obtained
Table_ref::mdl_request::ticket is set to non-NULL value.
@retval true Some error occurred (probably thread was killed).
*/
static bool try_acquire_high_prio_shared_mdl_lock(THD *thd, Table_ref *table,
bool can_deadlock) {
bool error;
MDL_REQUEST_INIT(&table->mdl_request, MDL_key::TABLE, table->db,
table->table_name, MDL_SHARED_HIGH_PRIO, MDL_TRANSACTION);
if (can_deadlock) {
/*
When .FRM is being open in order to get data for an I_S table,
we might have some tables not only open but also locked.
E.g. this happens when a SHOW or I_S statement is run
under LOCK TABLES or inside a stored function.
By waiting for the conflicting metadata lock to go away we
might create a deadlock which won't entirely belong to the
MDL subsystem and thus won't be detectable by this subsystem's
deadlock detector. To avoid such situation, when there are
other locked tables, we prefer not to wait on a conflicting lock.
*/
error = thd->mdl_context.try_acquire_lock(&table->mdl_request);
} else {
error = thd->mdl_context.acquire_lock(&table->mdl_request,
thd->variables.lock_wait_timeout);
}
return error;
}
bool Sql_cmd_show_table_base::check_parameters(THD *thd) {
// No MDL lock required for temporary tables
if (m_temporary) return false;
bool can_deadlock = thd->mdl_context.has_locks();
Table_ref *table = thd->lex->query_tables;
Table_ref *dst_table = table->schema_query_block->get_table_list();
if (try_acquire_high_prio_shared_mdl_lock(thd, dst_table, can_deadlock)) {
/*
Some error occurred (most probably we have been killed while
waiting for conflicting locks to go away), let the caller to
handle the situation.
*/
return true;
}
if (dst_table->mdl_request.ticket == nullptr) {
/*
We are in situation when we have encountered conflicting metadata
lock and deadlocks can occur due to waiting for it to go away.
So instead of waiting skip this table with an appropriate warning.
*/
assert(can_deadlock);
my_error(ER_WARN_I_S_SKIPPED_TABLE, MYF(0), dst_table->db,
dst_table->table_name);
return true;
}
// Stop if given database does not exist.
dd::Schema_MDL_locker mdl_handler(thd);
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
const dd::Schema *schema = nullptr;
if (mdl_handler.ensure_locked(dst_table->db) ||
thd->dd_client()->acquire(dst_table->db, &schema))
return true;
if (schema == nullptr) {
my_error(ER_BAD_DB_ERROR, MYF(0), dst_table->db);
return true;
}
const dd::Abstract_table *at = nullptr;
if (thd->dd_client()->acquire(dst_table->db, dst_table->table_name, &at))
return true;
if (at == nullptr) {
my_error(ER_NO_SUCH_TABLE, MYF(0), dst_table->db, dst_table->table_name);
return true;
}
return false;
}
bool Sql_cmd_show_status::execute(THD *thd) {
System_status_var old_status_var = thd->status_var;
thd->initial_status_var = &old_status_var;
bool status = Sql_cmd_show::execute(thd);
// Don't log SHOW STATUS commands to slow query log
thd->server_status &=
~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
// Restore status variables, as we don't want 'show status' to cause changes
mysql_mutex_lock(&LOCK_status);
add_diff_to_status(&global_status_var, &thd->status_var, &old_status_var);
thd->status_var = old_status_var;
thd->initial_status_var = nullptr;
mysql_mutex_unlock(&LOCK_status);
return status;
}
/***************************************************************************
** List all table types supported
***************************************************************************/
static size_t make_version_string(char *buf, size_t buf_length, uint version) {
return snprintf(buf, buf_length, "%d.%d", version >> 8, version & 0xff);
}
static bool show_plugins(THD *thd, plugin_ref plugin, void *arg) {
TABLE *table = (TABLE *)arg;
struct st_mysql_plugin *plug = plugin_decl(plugin);
struct st_plugin_dl *plugin_dl = plugin_dlib(plugin);
CHARSET_INFO *cs = system_charset_info;
char version_buf[20];
restore_record(table, s->default_values);
DBUG_EXECUTE_IF("set_uninstall_sync_point", {
if (strcmp(plugin_name(plugin)->str, "EXAMPLE") == 0)
DEBUG_SYNC(thd, "before_store_plugin_name");
});
mysql_mutex_lock(&LOCK_plugin);
if (plugin == nullptr || plugin_state(plugin) == PLUGIN_IS_FREED) {
mysql_mutex_unlock(&LOCK_plugin);
return false;
}
table->field[0]->store(plugin_name(plugin)->str, plugin_name(plugin)->length,
cs);
table->field[1]->store(
version_buf,
make_version_string(version_buf, sizeof(version_buf), plug->version), cs);
switch (plugin_state(plugin)) {
/* case PLUGIN_IS_FREED: does not happen */
case PLUGIN_IS_DELETED:
table->field[2]->store(STRING_WITH_LEN("DELETED"), cs);
break;
case PLUGIN_IS_UNINITIALIZED:
case PLUGIN_IS_WAITING_FOR_UPGRADE:
table->field[2]->store(STRING_WITH_LEN("INACTIVE"), cs);
break;
case PLUGIN_IS_READY:
table->field[2]->store(STRING_WITH_LEN("ACTIVE"), cs);
break;
case PLUGIN_IS_DYING:
table->field[2]->store(STRING_WITH_LEN("DELETING"), cs);
break;
case PLUGIN_IS_DISABLED:
table->field[2]->store(STRING_WITH_LEN("DISABLED"), cs);
break;
default:
assert(0);
}
table->field[3]->store(plugin_type_names[plug->type].str,
plugin_type_names[plug->type].length, cs);
table->field[4]->store(version_buf,
make_version_string(version_buf, sizeof(version_buf),
*(uint *)plug->info),
cs);
if (plugin_dl) {
table->field[5]->store(plugin_dl->dl.str, plugin_dl->dl.length, cs);
table->field[5]->set_notnull();
table->field[6]->store(version_buf,
make_version_string(version_buf, sizeof(version_buf),
plugin_dl->version),
cs);
table->field[6]->set_notnull();
} else {
table->field[5]->set_null();
table->field[6]->set_null();
}
if (plug->author) {
table->field[7]->store(plug->author, strlen(plug->author), cs);
table->field[7]->set_notnull();
} else
table->field[7]->set_null();
if (plug->descr) {
table->field[8]->store(plug->descr, strlen(plug->descr), cs);
table->field[8]->set_notnull();
} else
table->field[8]->set_null();
switch (plug->license) {
case PLUGIN_LICENSE_GPL:
table->field[9]->store(PLUGIN_LICENSE_GPL_STRING,
strlen(PLUGIN_LICENSE_GPL_STRING), cs);
break;
case PLUGIN_LICENSE_BSD:
table->field[9]->store(PLUGIN_LICENSE_BSD_STRING,
strlen(PLUGIN_LICENSE_BSD_STRING), cs);
break;
default:
table->field[9]->store(PLUGIN_LICENSE_PROPRIETARY_STRING,
strlen(PLUGIN_LICENSE_PROPRIETARY_STRING), cs);
break;
}
table->field[9]->set_notnull();
table->field[10]->store(
global_plugin_typelib_names[plugin_load_option(plugin)],
strlen(global_plugin_typelib_names[plugin_load_option(plugin)]), cs);
mysql_mutex_unlock(&LOCK_plugin);
return schema_table_store_record(thd, table);
}
static int fill_plugins(THD *thd, Table_ref *tables, Item *) {
DBUG_TRACE;
if (plugin_foreach_with_mask(thd, show_plugins, MYSQL_ANY_PLUGIN,
~PLUGIN_IS_FREED, tables->table))
return 1;
return 0;
}
/***************************************************************************
List all privileges supported
***************************************************************************/
struct show_privileges_st {
const char *privilege;
const char *context;
const char *comment;
};
static struct show_privileges_st sys_privileges[] = {
{"Alter", "Tables", "To alter the table"},
{"Alter routine", "Functions,Procedures",
"To alter or drop stored functions/procedures"},
{"Create", "Databases,Tables,Indexes",
"To create new databases and tables"},
{"Create routine", "Databases", "To use CREATE FUNCTION/PROCEDURE"},
{"Create role", "Server Admin", "To create new roles"},
{"Create temporary tables", "Databases", "To use CREATE TEMPORARY TABLE"},
{"Create view", "Tables", "To create new views"},
{"Create user", "Server Admin", "To create new users"},
{"Delete", "Tables", "To delete existing rows"},
{"Drop", "Databases,Tables", "To drop databases, tables, and views"},
{"Drop role", "Server Admin", "To drop roles"},
{"Event", "Server Admin", "To create, alter, drop and execute events"},
{"Execute", "Functions,Procedures", "To execute stored routines"},
{"File", "File access on server", "To read and write files on the server"},
{"Grant option", "Databases,Tables,Functions,Procedures",
"To give to other users those privileges you possess"},
{"Index", "Tables", "To create or drop indexes"},
{"Insert", "Tables", "To insert data into tables"},
{"Lock tables", "Databases",
"To use LOCK TABLES (together with SELECT privilege)"},
{"Process", "Server Admin",
"To view the plain text of currently executing queries"},
{"Proxy", "Server Admin", "To make proxy user possible"},
{"References", "Databases,Tables", "To have references on tables"},
{"Reload", "Server Admin",
"To reload or refresh tables, logs and privileges"},
{"Replication client", "Server Admin",
"To ask where the slave or master servers are"},
{"Replication slave", "Server Admin",
"To read binary log events from the master"},
{"Select", "Tables", "To retrieve rows from table"},
{"Show databases", "Server Admin",
"To see all databases with SHOW DATABASES"},
{"Show view", "Tables", "To see views with SHOW CREATE VIEW"},
{"Shutdown", "Server Admin", "To shut down the server"},
{"Super", "Server Admin",
"To use KILL thread, SET GLOBAL, CHANGE MASTER, etc."},
{"Trigger", "Tables", "To use triggers"},
{"Create tablespace", "Server Admin", "To create/alter/drop tablespaces"},
{"Update", "Tables", "To update existing rows"},
{"Usage", "Server Admin", "No privileges - allow connect only"},
{NullS, NullS, NullS}};
bool mysqld_show_privileges(THD *thd) {
Protocol *protocol = thd->get_protocol();
DBUG_TRACE;
mem_root_deque<Item *> field_list(thd->mem_root);
field_list.push_back(new Item_empty_string("Privilege", 10));
field_list.push_back(new Item_empty_string("Context", 15));
field_list.push_back(new Item_empty_string("Comment", NAME_CHAR_LEN));
if (thd->send_result_metadata(field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
return true;
show_privileges_st *privilege = sys_privileges;
for (privilege = sys_privileges; privilege->privilege; privilege++) {
protocol->start_row();
protocol->store(privilege->privilege, system_charset_info);
protocol->store(privilege->context, system_charset_info);
protocol->store(privilege->comment, system_charset_info);
if (protocol->end_row()) return true;
}
if (iterate_all_dynamic_privileges(thd,
/*
For each registered dynamic privilege
send a strz to this lambda function.
*/
[&](const char *c) -> bool {
protocol->start_row();
protocol->store(c, system_charset_info);
protocol->store("Server Admin",
system_charset_info);
protocol->store("", system_charset_info);
if (protocol->end_row()) return true;
return false;
})) {
return true;
}
my_eof(thd);
return false;
}
/**
An Internal_error_handler that suppresses errors regarding views'
underlying tables that occur during privilege checking within SHOW CREATE
VIEW commands. This happens in the cases when
- A view's underlying table (e.g. referenced in its SELECT list) does not
exist or columns of underlying table are altered. There should not be an
error as no attempt was made to access it per se.
- Access is denied for some table, column, function or stored procedure