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MySQL_Session.cpp
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#include "../deps/json/json.hpp"
using json = nlohmann::json;
#define PROXYJSON
#include "MySQL_HostGroups_Manager.h"
#include "MySQL_Thread.h"
#include "proxysql.h"
#include "cpp.h"
#include "proxysql_utils.h"
#include "re2/re2.h"
#include "re2/regexp.h"
#include "mysqld_error.h"
#include "MySQL_Data_Stream.h"
#include "MySQL_Query_Processor.h"
#include "MySQL_PreparedStatement.h"
#include "MySQL_Logger.hpp"
#include "StatCounters.h"
#include "MySQL_Authentication.hpp"
#include "MySQL_LDAP_Authentication.hpp"
#include "MySQL_Protocol.h"
#include "SQLite3_Server.h"
#include "MySQL_Variables.h"
#include "ProxySQL_Cluster.hpp"
#include "MySQL_Query_Cache.h"
#include "libinjection.h"
#include "libinjection_sqli.h"
#define SELECT_VERSION_COMMENT "select @@version_comment limit 1"
#define SELECT_VERSION_COMMENT_LEN 32
//#define SELECT_DB_USER "select DATABASE(), USER() limit 1"
#define SELECT_DB_USER_LEN 33
//#define SELECT_CHARSET_STATUS "select @@character_set_client, @@character_set_connection, @@character_set_server, @@character_set_database limit 1"
#define SELECT_CHARSET_STATUS_LEN 115
#define PROXYSQL_VERSION_COMMENT "\x01\x00\x00\x01\x01\x27\x00\x00\x02\x03\x64\x65\x66\x00\x00\x00\x11\x40\x40\x76\x65\x72\x73\x69\x6f\x6e\x5f\x63\x6f\x6d\x6d\x65\x6e\x74\x00\x0c\x21\x00\x18\x00\x00\x00\xfd\x00\x00\x1f\x00\x00\x05\x00\x00\x03\xfe\x00\x00\x02\x00\x0b\x00\x00\x04\x0a(ProxySQL)\x05\x00\x00\x05\xfe\x00\x00\x02\x00"
#define PROXYSQL_VERSION_COMMENT_LEN 81
// PROXYSQL_VERSION_COMMENT_WITH_OK is sent instead of PROXYSQL_VERSION_COMMENT
// if Client supports CLIENT_DEPRECATE_EOF
#define PROXYSQL_VERSION_COMMENT_WITH_OK "\x01\x00\x00\x01\x01" \
"\x27\x00\x00\x02\x03\x64\x65\x66\x00\x00\x00\x11\x40\x40\x76\x65\x72\x73\x69\x6f\x6e\x5f\x63\x6f\x6d\x6d\x65\x6e\x74\x00\x0c\x21\x00\x18\x00\x00\x00\xfd\x00\x00\x1f\x00\x00" \
"\x0b\x00\x00\x03\x0a(ProxySQL)" \
"\x07\x00\x00\x04\xfe\x00\x00\x02\x00\x00\x00"
#define PROXYSQL_VERSION_COMMENT_WITH_OK_LEN 74
#define SELECT_CONNECTION_ID "SELECT CONNECTION_ID()"
#define SELECT_CONNECTION_ID_LEN 22
#define SELECT_LAST_INSERT_ID "SELECT LAST_INSERT_ID()"
#define SELECT_LAST_INSERT_ID_LEN 23
#define SELECT_LAST_INSERT_ID_FROM_DUAL "SELECT LAST_INSERT_ID() FROM DUAL"
#define SELECT_LAST_INSERT_ID_FROM_DUAL_LEN 33
#define SELECT_LAST_INSERT_ID_LIMIT1 "SELECT LAST_INSERT_ID() LIMIT 1"
#define SELECT_LAST_INSERT_ID_LIMIT1_LEN 31
#define SELECT_VARIABLE_IDENTITY "SELECT @@IDENTITY"
#define SELECT_VARIABLE_IDENTITY_LEN 17
#define SELECT_VARIABLE_IDENTITY_LIMIT1 "SELECT @@IDENTITY LIMIT 1"
#define SELECT_VARIABLE_IDENTITY_LIMIT1_LEN 25
#define SELECT_MYSQL_VERSION "SELECT @@version"
#define SELECT_MYSQL_VERSION_LEN 16
#define SELECT_MYSQL_VERSION_FUNC "SELECT VERSION()"
#define SELECT_MYSQL_VERSION_FUNC_LEN 16
#define EXPMARIA
using std::function;
using std::vector;
static inline char is_digit(char c) {
if(c >= '0' && c <= '9')
return 1;
return 0;
}
static inline char is_normal_char(char c) {
if(c >= 'a' && c <= 'z')
return 1;
if(c >= 'A' && c <= 'Z')
return 1;
if(c >= '0' && c <= '9')
return 1;
if(c == '$' || c == '_')
return 1;
return 0;
}
static const std::set<std::string> mysql_variables_boolean = {
"aurora_read_replica_read_committed",
"foreign_key_checks",
"innodb_strict_mode",
"innodb_table_locks",
"sql_auto_is_null",
"sql_big_selects",
"sql_generate_invisible_primary_key",
"sql_log_bin",
"sql_quote_show_create",
"sql_require_primary_key",
"sql_safe_updates",
"unique_checks",
};
static const std::set<std::string> mysql_variables_numeric = {
"auto_increment_increment",
"auto_increment_offset",
"group_concat_max_len",
"innodb_lock_wait_timeout",
"join_buffer_size",
"lock_wait_timeout",
"long_query_time",
"max_execution_time",
"max_heap_table_size",
"max_join_size",
"max_sort_length",
"max_statement_time",
"optimizer_prune_level",
"optimizer_search_depth",
"optimizer_use_condition_selectivity",
"query_cache_type",
"sort_buffer_size",
"sql_select_limit",
"timestamp",
"tmp_table_size",
"wsrep_sync_wait"
};
static const std::set<std::string> mysql_variables_strings = {
"default_storage_engine",
"default_tmp_storage_engine",
"group_replication_consistency",
"lc_messages",
"lc_time_names",
"log_slow_filter",
"optimizer_switch",
"wsrep_osu_method",
};
#include "proxysql_find_charset.h"
extern MySQL_Authentication *GloMyAuth;
extern MySQL_LDAP_Authentication *GloMyLdapAuth;
extern ProxySQL_Admin *GloAdmin;
extern MySQL_Logger *GloMyLogger;
extern MySQL_STMT_Manager_v14 *GloMyStmt;
extern SQLite3_Server *GloSQLite3Server;
#ifdef PROXYSQLCLICKHOUSE
extern ClickHouse_Authentication *GloClickHouseAuth;
extern ClickHouse_Server *GloClickHouseServer;
#endif /* PROXYSQLCLICKHOUSE */
/**
* @brief Converts session type to a human-readable string.
* @param session_type The session type to convert.
* @return A string representing the session type.
*/
/*
std::string proxysql_session_type_str(enum proxysql_session_type session_type) {
if (session_type == PROXYSQL_SESSION_MYSQL) {
return "PROXYSQL_SESSION_MYSQL";
} else if (session_type == PROXYSQL_SESSION_ADMIN) {
return "PROXYSQL_SESSION_ADMIN";
} else if (session_type == PROXYSQL_SESSION_STATS) {
return "PROXYSQL_SESSION_STATS";
} else if (session_type == PROXYSQL_SESSION_SQLITE) {
return "PROXYSQL_SESSION_SQLITE";
} else if (session_type == PROXYSQL_SESSION_CLICKHOUSE) {
return "PROXYSQL_SESSION_CLICKHOUSE";
} else if (session_type == PROXYSQL_SESSION_MYSQL_EMU) {
return "PROXYSQL_SESSION_MYSQL_EMU";
} else {
return "PROXYSQL_SESSION_NONE";
}
};*/
KillArgs::KillArgs(char* u, char* p, char* h, unsigned int P, unsigned int _hid, unsigned long i, int kt, int _use_ssl, MySQL_Thread* _mt) :
KillArgs(u, p, h, P, _hid, i, kt, _use_ssl, _mt, NULL) {
// resolving DNS if available in Cache
if (h && P) {
const std::string& ip = MySQL_Monitor::dns_lookup(h, false);
if (ip.empty() == false) {
ip_addr = strdup(ip.c_str());
}
}
}
KillArgs::KillArgs(char* u, char* p, char* h, unsigned int P, unsigned int _hid, unsigned long i, int kt, int _use_ssl, MySQL_Thread *_mt, char *ip) {
username=strdup(u);
password=strdup(p);
hostname=strdup(h);
ip_addr = NULL;
if (ip)
ip_addr = strdup(ip);
port=P;
hid=_hid;
id=i;
kill_type=kt;
use_ssl=_use_ssl;
mt=_mt;
}
KillArgs::~KillArgs() {
free(username);
free(password);
free(hostname);
if (ip_addr)
free(ip_addr);
}
const char* KillArgs::get_host_address() const {
const char* host_address = hostname;
if (ip_addr)
host_address = ip_addr;
return host_address;
}
/**
* @brief Thread function to kill a query or connection on a MySQL server.
*
* This function is executed in a separate thread to kill a query or connection on a MySQL server.
* It establishes a connection to the MySQL server and sends a kill command to terminate the specified query or connection.
*
* @param[in] arg A pointer to a KillArgs structure containing the necessary parameters for killing the query or connection.
* @return nullptr.
*/
void* kill_query_thread(void *arg) {
KillArgs *ka=(KillArgs *)arg;
//! It initializes a new MySQL_Thread object to handle MySQL-related operations.
std::unique_ptr<MySQL_Thread> mysql_thr(new MySQL_Thread());
set_thread_name("KillQuery", GloVars.set_thread_name);
//! Retrieves the current time and refreshes thread variables.
mysql_thr->curtime=monotonic_time();
mysql_thr->refresh_variables();
//! Initializes ssl_params to NULL, which holds SSL parameters for the MySQL connection.
MySQLServers_SslParams * ssl_params = NULL;
//! Initializes a new MySQL connection using mysql_init(NULL).
MYSQL *mysql=mysql_init(NULL);
if (!mysql) {
goto __exit_kill_query_thread;
}
//! Sets specific connection attributes such as program_name and _server_host using mysql_options4().
mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD, "program_name", "proxysql_killer");
mysql_options4(mysql, MYSQL_OPT_CONNECT_ATTR_ADD, "_server_host", ka->hostname);
//! If SSL is enabled and port information is available, it retrieves SSL parameters for the server from MyHGM and configures the MySQL connection accordingly.
if (ka->use_ssl && ka->port) {
ssl_params = MyHGM->get_Server_SSL_Params(ka->hostname, ka->port, ka->username);
MySQL_Connection::set_ssl_params(mysql,ssl_params);
mysql_options(mysql, MARIADB_OPT_SSL_KEYLOG_CALLBACK, (void*)proxysql_keylog_write_line_callback);
}
MYSQL *ret;
//! Depending on the type of operation (kill_type), constructs a KILL command string (buf) to terminate the specified query or connection.
if (ka->port) {
switch (ka->kill_type) {
case KILL_QUERY:
proxy_warning("KILL QUERY %lu on %s:%d\n", ka->id, ka->hostname, ka->port);
if (ka->mt) {
ka->mt->status_variables.stvar[st_var_killed_queries]++;
}
break;
case KILL_CONNECTION:
proxy_warning("KILL CONNECTION %lu on %s:%d\n", ka->id, ka->hostname, ka->port);
if (ka->mt) {
ka->mt->status_variables.stvar[st_var_killed_connections]++;
}
break;
default:
break;
}
ret=mysql_real_connect(mysql, ka->get_host_address(), ka->username, ka->password, NULL, ka->port, NULL, 0);
} else {
switch (ka->kill_type) {
case KILL_QUERY:
proxy_warning("KILL QUERY %lu on localhost\n", ka->id);
break;
case KILL_CONNECTION:
proxy_warning("KILL CONNECTION %lu on localhost\n", ka->id);
break;
default:
break;
}
ret=mysql_real_connect(mysql,"localhost",ka->username,ka->password,NULL,0,ka->hostname,0);
}
if (!ret) {
int myerr = mysql_errno(mysql);
if (ssl_params != NULL && myerr == 2026) {
proxy_error("Failed to connect to server %s:%d to run KILL %s %lu. SSL Params: %s , %s , %s , %s , %s , %s , %s , %s\n",
ka->hostname, ka->port, ( ka->kill_type==KILL_QUERY ? "QUERY" : "CONNECTION" ) , ka->id,
ssl_params->ssl_ca.c_str() , ssl_params->ssl_cert.c_str() , ssl_params->ssl_key.c_str() , ssl_params->ssl_capath.c_str() ,
ssl_params->ssl_crl.c_str() , ssl_params->ssl_crlpath.c_str() , ssl_params->ssl_cipher.c_str() , ssl_params->tls_version.c_str()
);
} else {
proxy_error("Failed to connect to server %s:%d to run KILL %s %lu: Error: %s\n" , ka->hostname, ka->port, ( ka->kill_type==KILL_QUERY ? "QUERY" : "CONNECTION" ) , ka->id, mysql_error(mysql));
}
MyHGM->p_update_mysql_error_counter(p_mysql_error_type::mysql, ka->hid, ka->hostname, ka->port, mysql_errno(mysql));
goto __exit_kill_query_thread;
}
MySQL_Monitor::update_dns_cache_from_mysql_conn(mysql);
char buf[100];
switch (ka->kill_type) {
case KILL_QUERY:
sprintf(buf,"KILL QUERY %lu", ka->id);
break;
case KILL_CONNECTION:
sprintf(buf,"KILL CONNECTION %lu", ka->id);
break;
default:
sprintf(buf,"KILL %lu", ka->id);
break;
}
//! Executes the KILL command using mysql_query() on the established MySQL connection. Note that this call is blocking.
// FIXME: these 2 calls are blocking, fortunately on their own thread
mysql_query(mysql,buf);
__exit_kill_query_thread:
//! clean-up
if (mysql)
mysql_close(mysql);
delete ka;
if (ssl_params != NULL) {
delete ssl_params;
ssl_params = NULL;
}
// De-initializes per-thread structures. Required in all auxiliary threads using MySQL and SSL.
mysql_thread_end();
return NULL;
}
extern MySQL_Query_Processor* GloMyQPro;
extern MySQL_Query_Cache *GloMyQC;
extern ProxySQL_Admin *GloAdmin;
extern MySQL_Threads_Handler *GloMTH;
/**
* @brief Default constructor.
* Initializes all member variables to their default values.
*/
Query_Info::Query_Info() {
MyComQueryCmd=MYSQL_COM_QUERY___NONE;
QueryPointer=NULL;
QueryLength=0;
QueryParserArgs.digest_text=NULL;
QueryParserArgs.first_comment=NULL;
stmt_info=NULL;
bool_is_select_NOT_for_update=false;
bool_is_select_NOT_for_update_computed=false;
have_affected_rows=false; // if affected rows is set, last_insert_id is set too
waiting_since = 0;
affected_rows=0;
last_insert_id = 0;
rows_sent=0;
start_time=0;
end_time=0;
stmt_client_id=0;
}
/**
* @brief Destructor.
* Frees resources associated with QueryParserArgs and stmt_info.
*/
Query_Info::~Query_Info() {
GloMyQPro->query_parser_free(&QueryParserArgs);
if (stmt_info) {
stmt_info=NULL;
}
}
/**
* @brief Initializes query information.
* @param _p Pointer to the query data.
* @param len Length of the query data.
* @param mysql_header Flag indicating whether MySQL header is present.
*/
void Query_Info::begin(unsigned char *_p, int len, bool mysql_header) {
MyComQueryCmd=MYSQL_COM_QUERY___NONE;
QueryPointer=NULL;
QueryLength=0;
mysql_stmt=NULL;
stmt_meta=NULL;
QueryParserArgs.digest_text=NULL;
QueryParserArgs.first_comment=NULL;
start_time=sess->thread->curtime;
init(_p, len, mysql_header);
if (mysql_thread___commands_stats || mysql_thread___query_digests) {
query_parser_init();
if (mysql_thread___commands_stats)
query_parser_command_type();
}
bool_is_select_NOT_for_update=false;
bool_is_select_NOT_for_update_computed=false;
have_affected_rows=false; // if affected rows is set, last_insert_id is set too
waiting_since = 0;
affected_rows=0;
last_insert_id = 0;
rows_sent=0;
sess->gtid_hid=-1;
stmt_client_id=0;
}
/**
* @brief Finalizes query information.
* Updates query counters and performs clean-up.
*/
void Query_Info::end() {
query_parser_update_counters();
query_parser_free();
if ((end_time-start_time) > (unsigned int)mysql_thread___long_query_time*1000) {
__sync_add_and_fetch(&sess->thread->status_variables.stvar[st_var_queries_slow],1);
}
if (sess->with_gtid) {
__sync_add_and_fetch(&sess->thread->status_variables.stvar[st_var_queries_gtid],1);
}
assert(mysql_stmt==NULL);
if (stmt_info) {
stmt_info=NULL;
}
if (stmt_meta) { // fix bug #796: memory is not freed in case of error during STMT_EXECUTE
if (stmt_meta->pkt) {
uint32_t stmt_global_id=0;
memcpy(&stmt_global_id,(char *)(stmt_meta->pkt)+5,sizeof(uint32_t));
sess->SLDH->reset(stmt_global_id);
free(stmt_meta->pkt);
stmt_meta->pkt=NULL;
}
stmt_meta = NULL;
}
}
/**
* @brief Initializes query information with the given parameters.
* @param _p Pointer to the query data.
* @param len Length of the query data.
* @param mysql_header Flag indicating whether MySQL header is present.
*/
void Query_Info::init(unsigned char *_p, int len, bool mysql_header) {
QueryLength=(mysql_header ? len-5 : len);
QueryPointer=(mysql_header ? _p+5 : _p);
MyComQueryCmd = MYSQL_COM_QUERY__UNINITIALIZED;
bool_is_select_NOT_for_update=false;
bool_is_select_NOT_for_update_computed=false;
have_affected_rows=false; // if affected rows is set, last_insert_id is set too
waiting_since = 0;
affected_rows=0;
last_insert_id = 0;
rows_sent=0;
}
/**
* @brief Initializes the query parser.
*/
void Query_Info::query_parser_init() {
GloMyQPro->query_parser_init(&QueryParserArgs,(char *)QueryPointer,QueryLength,0);
}
/**
* @brief Retrieves the command type of the query from the query parser.
* @return The command type of the query.
*/
enum MYSQL_COM_QUERY_command Query_Info::query_parser_command_type() {
MyComQueryCmd= GloMyQPro->query_parser_command_type(&QueryParserArgs);
return MyComQueryCmd;
}
/**
* @brief Frees resources associated with the query parser.
*/
void Query_Info::query_parser_free() {
GloMyQPro->query_parser_free(&QueryParserArgs);
}
/**
* @brief Updates query counters and resets member variables.
* @return The number of rows affected by the query.
*/
unsigned long long Query_Info::query_parser_update_counters() {
if (stmt_info) {
MyComQueryCmd=stmt_info->MyComQueryCmd;
}
if (MyComQueryCmd==MYSQL_COM_QUERY___NONE) return 0; // this means that it was never initialized
if (MyComQueryCmd == MYSQL_COM_QUERY__UNINITIALIZED) return 0; // this means that it was never initialized
unsigned long long ret= GloMyQPro->query_parser_update_counters(sess, MyComQueryCmd, &QueryParserArgs, end_time-start_time);
MyComQueryCmd=MYSQL_COM_QUERY___NONE;
QueryPointer=NULL;
QueryLength=0;
return ret;
}
/**
* @brief Retrieves the digest text of the query from the query parser.
* @return The digest text of the query.
*/
char * Query_Info::get_digest_text() {
return GloMyQPro->get_digest_text(&QueryParserArgs);
}
/**
* @brief Checks if the query is a SELECT statement with the NOT FOR UPDATE clause.
* @return True if the query is a SELECT statement with the NOT FOR UPDATE clause, false otherwise.
*/
bool Query_Info::is_select_NOT_for_update() {
if (stmt_info) { // we are processing a prepared statement. We already have the information
return stmt_info->is_select_NOT_for_update;
}
if (QueryPointer==NULL) {
return false;
}
if (bool_is_select_NOT_for_update_computed) {
return bool_is_select_NOT_for_update;
}
bool_is_select_NOT_for_update_computed=true;
if (QueryLength<7) {
return false;
}
char *QP = (char *)QueryPointer;
size_t ql = QueryLength;
// we try to use the digest, if avaiable
if (QueryParserArgs.digest_text) {
QP = QueryParserArgs.digest_text;
ql = strlen(QP);
}
if (strncasecmp(QP,(char *)"SELECT ",7)) {
return false;
}
// if we arrive till here, it is a SELECT
if (ql>=17) {
char *p=QP;
p+=ql-11;
if (strncasecmp(p," FOR UPDATE",11)==0) {
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
p=QP;
p+=ql-10;
if (strncasecmp(p," FOR SHARE",10)==0) {
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
if (ql>=25) {
char *p=QP;
p+=ql-19;
if (strncasecmp(p," LOCK IN SHARE MODE",19)==0) {
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
p=QP;
p+=ql-7;
if (strncasecmp(p," NOWAIT",7)==0) {
// let simplify. If NOWAIT is used, we assume FOR UPDATE|SHARE is used
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
p=QP;
p+=ql-12;
if (strncasecmp(p," SKIP LOCKED",12)==0) {
// let simplify. If SKIP LOCKED is used, we assume FOR UPDATE|SHARE is used
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
p=QP;
char buf[129];
if (ql>=128) { // for long query, just check the last 128 bytes
p+=ql-128;
memcpy(buf,p,128);
buf[128]=0;
} else {
memcpy(buf,p,ql);
buf[ql]=0;
}
if (strcasestr(buf," FOR ")) {
if (strcasestr(buf," FOR UPDATE ")) {
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
if (strcasestr(buf," FOR SHARE ")) {
__sync_fetch_and_add(&MyHGM->status.select_for_update_or_equivalent, 1);
return false;
}
}
}
}
bool_is_select_NOT_for_update=true;
return true;
}
void MySQL_Session::set_status(enum session_status e) {
if (e==session_status___NONE) {
if (mybe) {
if (mybe->server_myds) {
assert(mybe->server_myds->myconn==0);
if (mybe->server_myds->myconn) {
assert(mybe->server_myds->myconn->async_state_machine==ASYNC_IDLE);
}
}
}
}
status=e;
}
/**
* @brief Constructs a new MySQL session object.
*/
MySQL_Session::MySQL_Session() {
thread_session_id=0;
//handler_ret = 0;
pause_until=0;
qpo=new MySQL_Query_Processor_Output();
qpo->init();
start_time=0;
command_counters=new StatCounters(15,10);
healthy=1;
autocommit=true;
autocommit_handled=false;
sending_set_autocommit=false;
autocommit_on_hostgroup=-1;
killed=false;
session_type=PROXYSQL_SESSION_MYSQL;
//admin=false;
connections_handler=false;
max_connections_reached=false;
//stats=false;
client_authenticated=false;
default_schema=NULL;
user_attributes=NULL;
schema_locked=false;
session_fast_forward=SESSION_FORWARD_TYPE_NONE;
//started_sending_data_to_client=false;
handler_function=NULL;
client_myds=NULL;
to_process=0;
mybe=NULL;
mirror=false;
mirrorPkt.ptr=NULL;
mirrorPkt.size=0;
set_status(session_status___NONE);
warning_in_hg = -1;
idle_since = 0;
transaction_started_at = 0;
CurrentQuery.sess=this;
CurrentQuery.mysql_stmt=NULL;
CurrentQuery.stmt_meta=NULL;
CurrentQuery.stmt_global_id=0;
CurrentQuery.stmt_client_id=0;
CurrentQuery.stmt_info=NULL;
current_hostgroup=-1;
default_hostgroup=-1;
locked_on_hostgroup=-1;
locked_on_hostgroup_and_all_variables_set=false;
next_query_flagIN=-1;
mirror_hostgroup=-1;
mirror_flagOUT=-1;
active_transactions=0;
with_gtid = false;
use_ssl = false;
change_user_auth_switch = false;
//gtid_trxid = 0;
gtid_hid = -1;
memset(gtid_buf,0,sizeof(gtid_buf));
match_regexes=NULL;
init(); // we moved this out to allow CHANGE_USER
last_insert_id=0; // #1093
last_HG_affected_rows = -1; // #1421 : advanced support for LAST_INSERT_ID()
proxysql_node_address = NULL;
use_ldap_auth = false;
}
/**
* @brief Resets the MySQL session to its initial state.
*/
void MySQL_Session::reset() {
autocommit=true;
autocommit_handled=false;
sending_set_autocommit=false;
autocommit_on_hostgroup=-1;
warning_in_hg = -1;
current_hostgroup=-1;
default_hostgroup=-1;
locked_on_hostgroup=-1;
locked_on_hostgroup_and_all_variables_set=false;
if (sess_STMTs_meta) {
delete sess_STMTs_meta;
sess_STMTs_meta=NULL;
}
if (SLDH) {
delete SLDH;
SLDH=NULL;
}
if (mybes) {
reset_all_backends();
delete mybes;
mybes=NULL;
}
mybe=NULL;
with_gtid = false;
//gtid_trxid = 0;
gtid_hid = -1;
memset(gtid_buf,0,sizeof(gtid_buf));
if (session_type == PROXYSQL_SESSION_SQLITE) {
SQLite3_Session *sqlite_sess = (SQLite3_Session *)thread->gen_args;
if (sqlite_sess && sqlite_sess->sessdb) {
sqlite3 *db = sqlite_sess->sessdb->get_db();
if ((*proxy_sqlite3_get_autocommit)(db)==0) {
sqlite_sess->sessdb->execute((char *)"COMMIT");
}
}
}
if (client_myds) {
if (client_myds->myconn) {
client_myds->myconn->reset();
}
}
}
/**
* @brief Destructor for the MySQL session.
*/
MySQL_Session::~MySQL_Session() {
reset(); // we moved this out to allow CHANGE_USER
if (locked_on_hostgroup >= 0) {
thread->status_variables.stvar[st_var_hostgroup_locked]--;
}
if (client_myds) {
if (client_authenticated) {
switch (session_type) {
#ifdef PROXYSQLCLICKHOUSE
case PROXYSQL_SESSION_CLICKHOUSE:
GloClickHouseAuth->decrease_frontend_user_connections(client_myds->myconn->userinfo->username);
break;
#endif /* PROXYSQLCLICKHOUSE */
default:
if (use_ldap_auth == false) {
GloMyAuth->decrease_frontend_user_connections(
client_myds->myconn->userinfo->username,
client_myds->myconn->userinfo->passtype
);
} else {
GloMyLdapAuth->decrease_frontend_user_connections(client_myds->myconn->userinfo->fe_username);
}
break;
}
if (client_myds->myconn) {
__sync_fetch_and_sub(
client_myds->myconn->userinfo->passtype == PASSWORD_TYPE::PRIMARY ?
&MyHGM->status.client_connections_prim_pass :
&MyHGM->status.client_connections_addl_pass,
1
);
}
}
delete client_myds;
}
if (default_schema) {
free(default_schema);
}
if (user_attributes) {
free(user_attributes);
user_attributes = NULL;
}
proxy_debug(PROXY_DEBUG_NET,1,"Thread=%p, Session=%p -- Shutdown Session %p\n" , this->thread, this, this);
delete command_counters;
if (session_type==PROXYSQL_SESSION_MYSQL && connections_handler==false && mirror==false) {
__sync_fetch_and_sub(&MyHGM->status.client_connections,1);
}
assert(qpo);
delete qpo;
match_regexes=NULL;
if (mirror) {
__sync_sub_and_fetch(&GloMTH->status_variables.mirror_sessions_current,1);
GloMTH->status_variables.p_gauge_array[p_th_gauge::mirror_concurrency]->Decrement();
}
if (proxysql_node_address) {
delete proxysql_node_address;
proxysql_node_address = NULL;
}
}
/**
* @brief Handles COMMIT or ROLLBACK commands received from the client.
*
* The handler_CommitRollback() function processes COMMIT or ROLLBACK commands received from the client. It checks
* the command type and verifies if the command matches the expected syntax for COMMIT or ROLLBACK. If the command
* matches, it updates the respective commit or rollback count in the global monitor's status. Additionally, it
* checks for the presence of an active transaction to determine whether to forward the command or reply with an OK
* status.
*
* If there is an active transaction, the function sets the current hostgroup to the hostgroup of the active transaction
* and returns false, indicating that the command should be forwarded. If there are no active transactions, the function
* replies with an OK status and updates the client data stream accordingly.
*
* @param pkt Pointer to the packet containing the COMMIT or ROLLBACK command.
* @return True if the command is successfully handled and replied to, false otherwise.
*
* @see MySQL_Session::FindOneActiveTransaction()
* @see MySQL_Session::current_hostgroup
* @see MySQL_Session::autocommit
* @see MySQL_Session::client_myds
* @see MySQL_Data_Stream::DSS
* @see MySQL_Protocol::generate_pkt_OK()
* @see MySQL_Session::RequestEnd()
*/
bool MySQL_Session::handler_CommitRollback(PtrSize_t *pkt) {
if (pkt->size <= 5) { return false; }
char c=((char *)pkt->ptr)[5];
bool ret=false;
if (c=='c' || c=='C') {
if (pkt->size==strlen("commit")+5) {
if (strncasecmp((char *)"commit",(char *)pkt->ptr+5,6)==0) {
__sync_fetch_and_add(&MyHGM->status.commit_cnt, 1);
ret=true;
}
}
} else {
if (c=='r' || c=='R') {
if (pkt->size==strlen("rollback")+5) {
if ( strncasecmp((char *)"rollback",(char *)pkt->ptr+5,8)==0 ) {
__sync_fetch_and_add(&MyHGM->status.rollback_cnt, 1);
ret=true;
}
}
}
}
if (ret==false) {
return false; // quick exit
}
// in this part of the code (as at release 2.4.3) where we call
// NumActiveTransactions() with the check_savepoint flag .
// This to try to handle MySQL bug https://bugs.mysql.com/bug.php?id=107875
//
// Since we are limited to forwarding just one 'COMMIT|ROLLBACK', we work under the assumption that we
// only have one active transaction. Under this premise, we should execute this command under that
// specific connection, for that, we update 'current_hostgroup' with the first active transaction we are
// able to find. If more transactions are simultaneously open for the session, more 'COMMIT|ROLLBACK'
// commands are required to be issued by the client to continue ending transactions.
int hg = FindOneActiveTransaction(true);
if (hg != -1) {
// there is an active transaction, we must forward the request
current_hostgroup = hg;
return false;
} else {
// there is no active transaction, we will just reply OK
client_myds->DSS=STATE_QUERY_SENT_NET;
uint16_t setStatus = 0;
if (autocommit) setStatus |= SERVER_STATUS_AUTOCOMMIT;
client_myds->myprot.generate_pkt_OK(true,NULL,NULL,1,0,0,setStatus,0,NULL);
if (mirror==false) {
RequestEnd(NULL);
} else {
client_myds->DSS=STATE_SLEEP;
status=WAITING_CLIENT_DATA;
}
l_free(pkt->size,pkt->ptr);
if (c=='c' || c=='C') {
__sync_fetch_and_add(&MyHGM->status.commit_cnt_filtered, 1);
} else {
__sync_fetch_and_add(&MyHGM->status.rollback_cnt_filtered, 1);
}
return true;
}
return false;
}
/**
* @brief Handles the SET AUTOCOMMIT command received from the client.
*
* The handler_SetAutocommit() function processes the SET AUTOCOMMIT command received from the client.
* It parses the command to determine the new autocommit value and updates the autocommit status accordingly.
* Additionally, it checks for the presence of active transactions and handles the forwarding of the command if needed.
* The function also replies with an OK status to the client after processing the command.
*
* @param pkt Pointer to the packet containing the SET AUTOCOMMIT command.
* @return True if the command is successfully handled and replied to, false otherwise.
*
* @see MySQL_Session::autocommit_handled
* @see MySQL_Session::sending_set_autocommit
* @see MySQL_Session::current_hostgroup
* @see MySQL_Session::autocommit
* @see MySQL_Session::client_myds
* @see MySQL_Session::NumActiveTransactions()
* @see MySQL_Data_Stream::DSS
* @see MySQL_Protocol::generate_pkt_OK()
* @see MySQL_Session::RequestEnd()
*/
bool MySQL_Session::handler_SetAutocommit(PtrSize_t *pkt) {
autocommit_handled=false;
sending_set_autocommit=false;
size_t sal=strlen("set autocommit");
char * _ptr = (char *)pkt->ptr;
#ifdef DEBUG
string nqn = string((char *)CurrentQuery.QueryPointer,CurrentQuery.QueryLength);
proxy_debug(PROXY_DEBUG_MYSQL_QUERY_PROCESSOR, 5, "Parsing SET command = %s\n", nqn.c_str());
#endif
if ( pkt->size >= 7+sal) {
if (strncasecmp((char *)"SET @@session.autocommit",(char *)pkt->ptr+5,strlen((char *)"SET @@session.autocommit"))==0) {
memmove(_ptr+9, _ptr+19, pkt->size - 19);
memset(_ptr+pkt->size-10,' ',10);
}
if (strncasecmp((char *)"set autocommit",(char *)pkt->ptr+5,sal)==0) {
void *p = NULL;
// make a copy
PtrSize_t _new_pkt;
_new_pkt.size = pkt->size;
_new_pkt.ptr = malloc(_new_pkt.size);
memcpy(_new_pkt.ptr, pkt->ptr, _new_pkt.size);
_ptr = (char *)_new_pkt.ptr;
for (int i=5+sal; i < (int)_new_pkt.size; i++) {
*((char *)_new_pkt.ptr+i) = tolower(*((char *)_new_pkt.ptr+i));
}
p = memmem(_ptr+5+sal, pkt->size-5-sal, (void *)"false", 5);
if (p) {
memcpy(p,(void *)"0 ",5);
}
p = memmem(_ptr+5+sal, pkt->size-5-sal, (void *)"true", 4);
if (p) {
memcpy(p,(void *)"1 ",4);
}
p = memmem(_ptr+5+sal, pkt->size-5-sal, (void *)"off", 3);
if (p) {
memcpy(p,(void *)"0 ",3);
}
p = memmem(_ptr+5+sal, pkt->size-5-sal, (void *)"on", 2);
if (p) {
memcpy(p,(void *)"1 ",2);
}
unsigned int i;
bool eq=false;
int fd=-1; // first digit
for (i=5+sal;i<_new_pkt.size;i++) {
char c=((char *)_new_pkt.ptr)[i];
if (c!='0' && c!='1' && c!=' ' && c!='=' && c!='/') {
free(_new_pkt.ptr);
return false; // found a not valid char
}
if (eq==false) {
if (c!=' ' && c!='=') {
free(_new_pkt.ptr);
return false; // found a not valid char
}
if (c=='=') eq=true;
} else {
if (c!='0' && c!='1' && c!=' ' && c!='/') {
free(_new_pkt.ptr);
return false; // found a not valid char
}
if (fd==-1) {
if (c=='0' || c=='1') { // found first digit
if (c=='0')
fd=0;
else
fd=1;
}
} else {
if (c=='0' || c=='1') { // found second digit
free(_new_pkt.ptr);
return false;
} else {
if (c=='/' || c==' ') {
break;
}
}
}
}
}
if (fd >= 0) { // we can set autocommit
autocommit_handled=true;
#ifdef DEBUG
proxy_debug(PROXY_DEBUG_MYSQL_QUERY_PROCESSOR, 5, "Setting autocommit to = %d\n", fd);
#endif
__sync_fetch_and_add(&MyHGM->status.autocommit_cnt, 1);