set_var.cc File Reference

#include "sql/set_var.h"
#include <sys/types.h>
#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <string>
#include <string_view>
#include <utility>
#include "m_string.h"
#include "map_helpers.h"
#include "my_dbug.h"
#include "my_io.h"
#include "my_sys.h"
#include "mysql/components/services/bits/psi_bits.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/my_loglevel.h"
#include "mysql/plugin_audit.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/psi/mysql_rwlock.h"
#include "mysql/strings/dtoa.h"
#include "mysql/strings/int2str.h"
#include "mysql/strings/m_ctype.h"
#include "mysqld_error.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/debug_sync.h"
#include "sql/derror.h"
#include "sql/enum_query_type.h"
#include "sql/item.h"
#include "sql/item_func.h"
#include "sql/log.h"
#include "sql/mysqld.h"
#include "sql/persisted_variable.h"
#include "sql/protocol_classic.h"
#include "sql/session_tracker.h"
#include "sql/sql_audit.h"
#include "sql/sql_base.h"
#include "sql/sql_class.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_parse.h"
#include "sql/sql_plugin_ref.h"
#include "sql/sql_plugin_var.h"
#include "sql/sql_select.h"
#include "sql/sql_show.h"
#include "sql/sys_vars_shared.h"
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/thd_raii.h"
#include "sql_string.h"
#include "string_with_len.h"
#include "strxnmov.h"

Classes
struct	my_old_conv

Functions
collation_unordered_map< string, sys_var * > *	get_static_system_variable_hash ()
collation_unordered_map< string, sys_var * > *	get_dynamic_system_variable_hash ()
bool	get_sysvar_source (const char *name, uint length, enum enum_variable_source *source)
	Get source of a given system variable given its name and name length. More...
int	sys_var_init ()
int	sys_var_add_options (std::vector< my_option > *long_options, int parse_flags)
void	sys_var_end ()
bool	check_priv (THD *thd, bool static_variable)
	This function will check for necessary privileges needed to perform RESET PERSIST or SET PERSIST[_ONLY] operation. More...
bool	throw_bounds_warning (THD *thd, const char *name, bool fixed, bool is_unsigned, longlong v)
	Throw warning (error in STRICT mode) if value for variable needed bounding. More...
bool	throw_bounds_warning (THD *thd, const char *name, bool fixed, double v)
static void	set_tail_to_triple_dot (char *s, size_t size)
template<size_t N>
static void	copy_name (char(&to)[N], std::string_view from)
static void	merge_names (char *to, size_t capacity, std::string_view from1, std::string_view from2)
const CHARSET_INFO *	get_old_charset_by_name (const char *name)
bool	add_dynamic_system_variable_chain (sys_var *first)
	Add variables to the dynamic hash of system variables. More...
bool	add_static_system_variable_chain (sys_var *first)
	Add variables to the hash of static system variables. More...
void	delete_dynamic_system_variable_chain (sys_var *first)
	Remove variables from the dynamic hash of system variables. More...
ulong	get_system_variable_count (void)
ulonglong	get_dynamic_system_variable_hash_version (void)
sys_var *	find_static_system_variable (const std::string &name)
	Find a static system variable. More...
sys_var *	find_dynamic_system_variable (const std::string &name)
	Find a dynamic system variable. More...
sys_var *	intern_find_sys_var (const char *str, size_t length)
	Find a system variable, either static or dynamic. More...
sys_var *	check_find_sys_var (THD *thd, const char *str, size_t length, bool *sensitive)
int	sql_set_variables (THD *thd, List< set_var_base > *var_list, bool opened)
	Execute update of all variables. More...
bool	keyring_access_test ()
	This function is used to check if key management UDFs like keying_key_generate/store/remove should proceed or not. More...
static bool	can_persist_non_persistent_var (THD *thd, sys_var *var, enum_var_type setvar_type)
	Checks if a THD can set non-persist variables. More...
bool	get_global_variable_attributes (const char *variable_base, const char *variable_name, std::vector< std::pair< std::string, std::string > > &attributes)
bool	get_global_variable_attribute (const char *variable_base, const char *variable_name, const char *attribute_name, std::string &value)
bool	set_global_variable_attribute (const char *variable_base, const char *variable_name, const char *attribute_name, const char *attribute_value)
bool	set_global_variable_attribute (const System_variable_tracker &var_tracker, const char *attribute_name, const char *attribute_value)

Variables
static collation_unordered_map< string, sys_var * > *	static_system_variable_hash
static collation_unordered_map< string, sys_var * > *	dynamic_system_variable_hash
static PolyLock_mutex PLock_global_system_variables &	LOCK_global_system_variables
ulonglong	dynamic_system_variable_hash_version = 0
static collation_unordered_set< string > *	never_persistable_vars
	list of variables that shouldn't be persisted in all cases More...
sys_var_chain	all_sys_vars = {nullptr, nullptr}
static my_old_conv	old_conv []
char *	sys_var_persist_only_admin_x509_subject = nullptr
	global X509 subject name to require from the client session to allow SET PERSIST[_ONLY] on sys_var::NOTPERSIST variables More...

Function Documentation

add_dynamic_system_variable_chain()

bool add_dynamic_system_variable_chain

(

sys_var *

first

)

Add variables to the dynamic hash of system variables.

Parameters

first

Pointer to first system variable to add

Returns

false on success, otherwise true.

Note

Requires r/w lock on LOCK_system_variables_hash.

add_static_system_variable_chain()

bool add_static_system_variable_chain

(

sys_var *

first

)

Add variables to the hash of static system variables.

Parameters

first

Pointer to first system variable to add

Returns

false on success, otherwise true.

can_persist_non_persistent_var()

static bool can_persist_non_persistent_var ( THD *  thd, sys_var *  var, enum_var_type  setvar_type  )

static

Checks if a THD can set non-persist variables.

Requires that: the session uses SSL the peer has presented a valid certificate the certificate has a certain subject name

The format checked is deliberately kept the same as the other SSL system and status variables representing names. Hence X509_NAME_oneline is used.

Return values

true	the THD can set NON_PERSIST variables
false	usual restrictions apply

Parameters

thd	the THD handle
var	the variable to be set
setvar_type	the operation to check against.

See also

sys_variables_admin_dn

check_find_sys_var()

sys_var * check_find_sys_var	(	THD *	thd,
		const char *	str,
		size_t	length,
		bool *	sensitive
	)

check_priv()

bool check_priv	(	THD *	thd,
		bool	static_variable
	)

This function will check for necessary privileges needed to perform RESET PERSIST or SET PERSIST[_ONLY] operation.

Parameters

[in]	thd	Pointer to connection handle.
[in]	static_variable	describes if variable is static or dynamic

Returns

0 Success

1 Failure

copy_name()

template<size_t N>

static void copy_name ( char(&)  to[N], std::string_view  from  )

static

delete_dynamic_system_variable_chain()

void delete_dynamic_system_variable_chain

(

sys_var *

first

)

Remove variables from the dynamic hash of system variables.

Parameters

first

Pointer to first system variable to remove

Note

Requires r/w lock on LOCK_system_variables_hash.

find_dynamic_system_variable()

sys_var * find_dynamic_system_variable

(

const std::string &

name

)

Find a dynamic system variable.

Parameters

name	Name of system variable to find

Return values

pointer	pointer to variable definitions
nullptr	1. Unknown static variable (error message is given). Invisible static variable (no error message).

Note

Requires an external lock on LOCK_system_variable_hash.

find_static_system_variable()

sys_var * find_static_system_variable

(

const std::string &

name

)

Find a static system variable.

Parameters

name	Name of system variable to find

Return values

pointer	pointer to variable definitions
nullptr	1. Unknown static variable (error message is given). Invisible static variable (no error message).

Note

Unlike intern_find_sys_var() and find_dynamic_system_variable(), an external lock on LOCK_system_variable_hash is not necessary.

get_dynamic_system_variable_hash()

collation_unordered_map< string, sys_var * > * get_dynamic_system_variable_hash

(

void

)

get_dynamic_system_variable_hash_version()

ulonglong get_dynamic_system_variable_hash_version

(

void

)

get_global_variable_attribute()

bool get_global_variable_attribute	(	const char *	variable_base,
		const char *	variable_name,
		const char *	attribute_name,
		std::string &	value
	)

get_global_variable_attributes()

bool get_global_variable_attributes	(	const char *	variable_base,
		const char *	variable_name,
		std::vector< std::pair< std::string, std::string > > &	attributes
	)

get_old_charset_by_name()

const CHARSET_INFO * get_old_charset_by_name

(

const char *

name

)

get_static_system_variable_hash()

collation_unordered_map< string, sys_var * > * get_static_system_variable_hash

(

void

)

get_system_variable_count()

ulong get_system_variable_count

(

void

)

get_sysvar_source()

bool get_sysvar_source	(	const char *	name,
		uint	length,
		enum enum_variable_source *	source
	)

Get source of a given system variable given its name and name length.

Note

Holds an intermediate lock on LOCK_system_variables_hash.

intern_find_sys_var()

sys_var * intern_find_sys_var	(	const char *	str,
		size_t	length
	)

Find a system variable, either static or dynamic.

Parameters

str	Name of system variable to find
length	Length of variable. zero means that we should use strlen() on the variable

Return values

pointer	pointer to variable definitions
nullptr	1. Unknown variable (error message is given). Invisible variable (no error message).

Note

Requires an external lock on LOCK_system_variable_hash.

keyring_access_test()

bool keyring_access_test

(

)

This function is used to check if key management UDFs like keying_key_generate/store/remove should proceed or not.

If global variable @keyring_operations is OFF then above said udfs will fail.

Returns

Operation status

Return values

0	OK
1	ERROR, keyring operations are not allowed

See also

Sys_keyring_operations

merge_names()

static void merge_names ( char *  to, size_t  capacity, std::string_view  from1, std::string_view  from2  )

static

set_global_variable_attribute() [1/2]

bool set_global_variable_attribute	(	const char *	variable_base,
		const char *	variable_name,
		const char *	attribute_name,
		const char *	attribute_value
	)

set_global_variable_attribute() [2/2]

bool set_global_variable_attribute	(	const System_variable_tracker &	var_tracker,
		const char *	attribute_name,
		const char *	attribute_value
	)

set_tail_to_triple_dot()

static void set_tail_to_triple_dot ( char *  s, size_t  size  )

static

sql_set_variables()

int sql_set_variables	(	THD *	thd,
		List< set_var_base > *	var_list,
		bool	opened
	)

Execute update of all variables.

First run a check of all variables that all updates will go ok. If yes, then execute all updates, returning an error if any one failed.

This should ensure that in all normal cases none all or variables are updated.

Parameters

thd	Thread id
var_list	List of variables to update
opened	True means tables are open and this function will lock them.

Return values

0	ok
1	ERROR, message sent (normally no variables was updated)
-1	ERROR, message not sent

sys_var_add_options()

int sys_var_add_options	(	std::vector< my_option > *	long_options,
		int	parse_flags
	)

sys_var_end()

void sys_var_end

(

void

)

sys_var_init()

int sys_var_init

(

)

throw_bounds_warning() [1/2]

bool throw_bounds_warning	(	THD *	thd,
		const char *	name,
		bool	fixed,
		bool	is_unsigned,
		longlong	v
	)

Throw warning (error in STRICT mode) if value for variable needed bounding.

Plug-in interface also uses this.

Parameters

thd	thread handle
name	variable's name
fixed	did we have to correct the value? (throw warn/err if so)
is_unsigned	is value's type unsigned?
v	variable's value

Return values

true	on error, false otherwise (warning or ok)

throw_bounds_warning() [2/2]

bool throw_bounds_warning	(	THD *	thd,
		const char *	name,
		bool	fixed,
		double	v
	)

Variable Documentation

all_sys_vars

sys_var_chain all_sys_vars = {nullptr, nullptr}

dynamic_system_variable_hash

collation_unordered_map<string, sys_var *>* dynamic_system_variable_hash

static

dynamic_system_variable_hash_version

ulonglong dynamic_system_variable_hash_version = 0

LOCK_global_system_variables

PolyLock_mutex PLock_global_system_variables & LOCK_global_system_variables

static

never_persistable_vars

collation_unordered_set<string>* never_persistable_vars

static

list of variables that shouldn't be persisted in all cases

old_conv

my_old_conv old_conv[]

static

Initial value:

= {{"cp1251_koi8", "cp1251"},
                                 {"cp1250_latin2", "cp1250"},
                                 {"kam_latin2", "keybcs2"},
                                 {"mac_latin2", "MacRoman"},
                                 {"macce_latin2", "MacCE"},
                                 {"pc2_latin2", "pclatin2"},
                                 {"vga_latin2", "pclatin1"},
                                 {"koi8_cp1251", "koi8r"},
                                 {"win1251ukr_koi8_ukr", "win1251ukr"},
                                 {"koi8_ukr_win1251ukr", "koi8u"},
                                 {nullptr, nullptr}}

static_system_variable_hash

collation_unordered_map<string, sys_var *>* static_system_variable_hash

static

sys_var_persist_only_admin_x509_subject

char* sys_var_persist_only_admin_x509_subject = nullptr

global X509 subject name to require from the client session to allow SET PERSIST[_ONLY] on sys_var::NOTPERSIST variables

See also

set_var::resolve