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mariadb/sql/sql_connect.cc
Sergei Golubchik f09ca00e08 merged
2010-03-15 12:51:23 +01:00

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/* Copyright (C) 2007 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Functions to autenticate and handle reqests for a connection
*/
#include "mysql_priv.h"
HASH global_user_stats, global_client_stats, global_table_stats;
HASH global_index_stats;
/* Protects the above global stats */
extern pthread_mutex_t LOCK_global_user_client_stats;
extern pthread_mutex_t LOCK_global_table_stats;
extern pthread_mutex_t LOCK_global_index_stats;
#ifdef HAVE_OPENSSL
/*
Without SSL the handshake consists of one packet. This packet
has both client capabilites and scrambled password.
With SSL the handshake might consist of two packets. If the first
packet (client capabilities) has CLIENT_SSL flag set, we have to
switch to SSL and read the second packet. The scrambled password
is in the second packet and client_capabilites field will be ignored.
Maybe it is better to accept flags other than CLIENT_SSL from the
second packet?
*/
#define SSL_HANDSHAKE_SIZE 2
#define NORMAL_HANDSHAKE_SIZE 6
#define MIN_HANDSHAKE_SIZE 2
#else
#define MIN_HANDSHAKE_SIZE 6
#endif /* HAVE_OPENSSL */
#ifdef __WIN__
extern void win_install_sigabrt_handler();
#endif
/*
Get structure for logging connection data for the current user
*/
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static HASH hash_user_connections;
static int get_or_create_user_conn(THD *thd, const char *user,
const char *host,
USER_RESOURCES *mqh)
{
int return_val= 0;
size_t temp_len, user_len;
char temp_user[USER_HOST_BUFF_SIZE];
struct user_conn *uc;
DBUG_ASSERT(user != 0);
DBUG_ASSERT(host != 0);
user_len= strlen(user);
temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
(void) pthread_mutex_lock(&LOCK_user_conn);
if (!(uc = (struct user_conn *) hash_search(&hash_user_connections,
(uchar*) temp_user, temp_len)))
{
/* First connection for user; Create a user connection object */
if (!(uc= ((struct user_conn*)
my_malloc(sizeof(struct user_conn) + temp_len+1,
MYF(MY_WME)))))
{
/* MY_WME ensures an error is set in THD. */
return_val= 1;
goto end;
}
uc->user=(char*) (uc+1);
memcpy(uc->user,temp_user,temp_len+1);
uc->host= uc->user + user_len + 1;
uc->len= temp_len;
uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
uc->user_resources= *mqh;
uc->reset_utime= thd->thr_create_utime;
if (my_hash_insert(&hash_user_connections, (uchar*) uc))
{
/* The only possible error is out of memory, MY_WME sets an error. */
my_free((char*) uc,0);
return_val= 1;
goto end;
}
}
thd->user_connect=uc;
uc->connections++;
end:
(void) pthread_mutex_unlock(&LOCK_user_conn);
return return_val;
}
/*
check if user has already too many connections
SYNOPSIS
check_for_max_user_connections()
thd Thread handle
uc User connect object
NOTES
If check fails, we decrease user connection count, which means one
shouldn't call decrease_user_connections() after this function.
RETURN
0 ok
1 error
*/
static
int check_for_max_user_connections(THD *thd, USER_CONN *uc)
{
int error=0;
DBUG_ENTER("check_for_max_user_connections");
(void) pthread_mutex_lock(&LOCK_user_conn);
if (max_user_connections && !uc->user_resources.user_conn &&
max_user_connections < (uint) uc->connections)
{
my_error(ER_TOO_MANY_USER_CONNECTIONS, MYF(0), uc->user);
error=1;
goto end;
}
time_out_user_resource_limits(thd, uc);
if (uc->user_resources.user_conn &&
uc->user_resources.user_conn < uc->connections)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user,
"max_user_connections",
(long) uc->user_resources.user_conn);
error= 1;
goto end;
}
if (uc->user_resources.conn_per_hour &&
uc->user_resources.conn_per_hour <= uc->conn_per_hour)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user,
"max_connections_per_hour",
(long) uc->user_resources.conn_per_hour);
error=1;
goto end;
}
uc->conn_per_hour++;
end:
if (error)
uc->connections--; // no need for decrease_user_connections() here
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
/*
Decrease user connection count
SYNOPSIS
decrease_user_connections()
uc User connection object
NOTES
If there is a n user connection object for a connection
(which only happens if 'max_user_connections' is defined or
if someone has created a resource grant for a user), then
the connection count is always incremented on connect.
The user connect object is not freed if some users has
'max connections per hour' defined as we need to be able to hold
count over the lifetime of the connection.
*/
void decrease_user_connections(USER_CONN *uc)
{
DBUG_ENTER("decrease_user_connections");
(void) pthread_mutex_lock(&LOCK_user_conn);
DBUG_ASSERT(uc->connections);
if (!--uc->connections && !mqh_used)
{
/* Last connection for user; Delete it */
(void) hash_delete(&hash_user_connections,(uchar*) uc);
}
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_VOID_RETURN;
}
/*
Reset per-hour user resource limits when it has been more than
an hour since they were last checked
SYNOPSIS:
time_out_user_resource_limits()
thd Thread handler
uc User connection details
NOTE:
This assumes that the LOCK_user_conn mutex has been acquired, so it is
safe to test and modify members of the USER_CONN structure.
*/
void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
{
ulonglong check_time= thd->start_utime;
DBUG_ENTER("time_out_user_resource_limits");
/* If more than a hour since last check, reset resource checking */
if (check_time - uc->reset_utime >= LL(3600000000))
{
uc->questions=1;
uc->updates=0;
uc->conn_per_hour=0;
uc->reset_utime= check_time;
}
DBUG_VOID_RETURN;
}
/*
Check if maximum queries per hour limit has been reached
returns 0 if OK.
*/
bool check_mqh(THD *thd, uint check_command)
{
bool error= 0;
USER_CONN *uc=thd->user_connect;
DBUG_ENTER("check_mqh");
DBUG_ASSERT(uc != 0);
(void) pthread_mutex_lock(&LOCK_user_conn);
time_out_user_resource_limits(thd, uc);
/* Check that we have not done too many questions / hour */
if (uc->user_resources.questions &&
uc->questions++ >= uc->user_resources.questions)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user, "max_questions",
(long) uc->user_resources.questions);
error=1;
goto end;
}
if (check_command < (uint) SQLCOM_END)
{
/* Check that we have not done too many updates / hour */
if (uc->user_resources.updates &&
(sql_command_flags[check_command] & CF_CHANGES_DATA) &&
uc->updates++ >= uc->user_resources.updates)
{
my_error(ER_USER_LIMIT_REACHED, MYF(0), uc->user, "max_updates",
(long) uc->user_resources.updates);
error=1;
goto end;
}
}
end:
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
/**
Check if user exist and password supplied is correct.
@param thd thread handle, thd->security_ctx->{host,user,ip} are used
@param command originator of the check: now check_user is called
during connect and change user procedures; used for
logging.
@param passwd scrambled password received from client
@param passwd_len length of scrambled password
@param db database name to connect to, may be NULL
@param check_count TRUE if establishing a new connection. In this case
check that we have not exceeded the global
max_connections limist
@note Host, user and passwd may point to communication buffer.
Current implementation does not depend on that, but future changes
should be done with this in mind; 'thd' is INOUT, all other params
are 'IN'.
@retval 0 OK; thd->security_ctx->user/master_access/priv_user/db_access and
thd->db are updated; OK is sent to the client.
@retval 1 error, e.g. access denied or handshake error, not sent to
the client. A message is pushed into the error stack.
*/
int
check_user(THD *thd, enum enum_server_command command,
const char *passwd, uint passwd_len, const char *db,
bool check_count)
{
DBUG_ENTER("check_user");
LEX_STRING db_str= { (char *) db, db ? strlen(db) : 0 };
/*
Clear thd->db as it points to something, that will be freed when
connection is closed. We don't want to accidentally free a wrong
pointer if connect failed. Also in case of 'CHANGE USER' failure,
current database will be switched to 'no database selected'.
*/
thd->reset_db(NULL, 0);
#ifdef NO_EMBEDDED_ACCESS_CHECKS
thd->main_security_ctx.master_access= GLOBAL_ACLS; // Full rights
/* Change database if necessary */
if (db && db[0])
{
if (mysql_change_db(thd, &db_str, FALSE))
DBUG_RETURN(1);
}
my_ok(thd);
DBUG_RETURN(0);
#else
my_bool opt_secure_auth_local;
pthread_mutex_lock(&LOCK_global_system_variables);
opt_secure_auth_local= opt_secure_auth;
pthread_mutex_unlock(&LOCK_global_system_variables);
/*
If the server is running in secure auth mode, short scrambles are
forbidden.
*/
if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
{
my_error(ER_NOT_SUPPORTED_AUTH_MODE, MYF(0));
general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN(1);
}
if (passwd_len != 0 &&
passwd_len != SCRAMBLE_LENGTH &&
passwd_len != SCRAMBLE_LENGTH_323)
{
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
DBUG_RETURN(1);
}
USER_RESOURCES ur;
int res= acl_getroot(thd, &ur, passwd, passwd_len);
#ifndef EMBEDDED_LIBRARY
if (res == -1)
{
/*
This happens when client (new) sends password scrambled with
scramble(), but database holds old value (scrambled with
scramble_323()). Here we please client to send scrambled_password
in old format.
*/
NET *net= &thd->net;
if (opt_secure_auth_local)
{
my_error(ER_SERVER_IS_IN_SECURE_AUTH_MODE, MYF(0),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip);
general_log_print(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip);
DBUG_RETURN(1);
}
/* We have to read very specific packet size */
if (send_old_password_request(thd) ||
my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
{
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
DBUG_RETURN(1);
}
/* Final attempt to check the user based on reply */
/* So as passwd is short, errcode is always >= 0 */
res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
}
#endif /*EMBEDDED_LIBRARY*/
/* here res is always >= 0 */
if (res == 0)
{
if (!(thd->main_security_ctx.master_access &
NO_ACCESS)) // authentication is OK
{
DBUG_PRINT("info",
("Capabilities: %lu packet_length: %ld Host: '%s' "
"Login user: '%s' Priv_user: '%s' Using password: %s "
"Access: %lu db: '%s'",
thd->client_capabilities,
thd->max_client_packet_length,
thd->main_security_ctx.host_or_ip,
thd->main_security_ctx.user,
thd->main_security_ctx.priv_user,
passwd_len ? "yes": "no",
thd->main_security_ctx.master_access,
(thd->db ? thd->db : "*none*")));
if (check_count)
{
bool count_ok= 1;
if (!(thd->main_security_ctx.master_access & SUPER_ACL))
{
pthread_mutex_lock(&LOCK_connection_count);
count_ok= (*thd->scheduler->connection_count <=
*thd->scheduler->max_connections);
VOID(pthread_mutex_unlock(&LOCK_connection_count));
}
if (!count_ok)
{ // too many connections
my_error(ER_CON_COUNT_ERROR, MYF(0));
DBUG_RETURN(1);
}
}
/*
Log the command before authentication checks, so that the user can
check the log for the tried login tried and also to detect
break-in attempts.
*/
general_log_print(thd, command,
(thd->main_security_ctx.priv_user ==
thd->main_security_ctx.user ?
(char*) "%s@%s on %s" :
(char*) "%s@%s as anonymous on %s"),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip,
db ? db : (char*) "");
/*
This is the default access rights for the current database. It's
set to 0 here because we don't have an active database yet (and we
may not have an active database to set.
*/
thd->main_security_ctx.db_access=0;
/* Don't allow user to connect if he has done too many queries */
if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
max_user_connections) &&
get_or_create_user_conn(thd,
(opt_old_style_user_limits ? thd->main_security_ctx.user :
thd->main_security_ctx.priv_user),
(opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip :
thd->main_security_ctx.priv_host),
&ur))
{
/* The error is set by get_or_create_user_conn(). */
DBUG_RETURN(1);
}
if (thd->user_connect &&
(thd->user_connect->user_resources.conn_per_hour ||
thd->user_connect->user_resources.user_conn ||
max_user_connections) &&
check_for_max_user_connections(thd, thd->user_connect))
{
/* The error is set in check_for_max_user_connections(). */
status_var_increment(denied_connections);
DBUG_RETURN(1);
}
/* Change database if necessary */
if (db && db[0])
{
if (mysql_change_db(thd, &db_str, FALSE))
{
/* mysql_change_db() has pushed the error message. */
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
status_var_increment(thd->status_var.access_denied_errors);
DBUG_RETURN(1);
}
}
my_ok(thd);
thd->net.net_skip_rest_factor= 2; // skip at most 2*max_packet_size
thd->password= test(passwd_len); // remember for error messages
/* Ready to handle queries */
DBUG_RETURN(0);
}
}
else if (res == 2) // client gave short hash, server has long hash
{
my_error(ER_NOT_SUPPORTED_AUTH_MODE, MYF(0));
general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN(1);
}
my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip,
passwd_len ? ER(ER_YES) : ER(ER_NO));
general_log_print(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
thd->main_security_ctx.user,
thd->main_security_ctx.host_or_ip,
passwd_len ? ER(ER_YES) : ER(ER_NO));
status_var_increment(thd->status_var.access_denied_errors);
DBUG_RETURN(1);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
Check for maximum allowable user connections, if the mysqld server is
started with corresponding variable that is greater then 0.
*/
extern "C" uchar *get_key_conn(user_conn *buff, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= buff->len;
return (uchar*) buff->user;
}
extern "C" void free_user(struct user_conn *uc)
{
my_free((char*) uc,MYF(0));
}
void init_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (hash_init(&hash_user_connections,system_charset_info,max_connections,
0,0,
(hash_get_key) get_key_conn, (hash_free_key) free_user,
0))
{
sql_print_error("Initializing hash_user_connections failed.");
exit(1);
}
#endif
}
void free_max_user_conn(void)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
hash_free(&hash_user_connections);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
void reset_mqh(LEX_USER *lu, bool get_them= 0)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
(void) pthread_mutex_lock(&LOCK_user_conn);
if (lu) // for GRANT
{
USER_CONN *uc;
uint temp_len=lu->user.length+lu->host.length+2;
char temp_user[USER_HOST_BUFF_SIZE];
memcpy(temp_user,lu->user.str,lu->user.length);
memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
if ((uc = (struct user_conn *) hash_search(&hash_user_connections,
(uchar*) temp_user, temp_len)))
{
uc->questions=0;
get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
uc->updates=0;
uc->conn_per_hour=0;
}
}
else
{
/* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
for (uint idx=0;idx < hash_user_connections.records; idx++)
{
USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
idx);
if (get_them)
get_mqh(uc->user,uc->host,uc);
uc->questions=0;
uc->updates=0;
uc->conn_per_hour=0;
}
}
(void) pthread_mutex_unlock(&LOCK_user_conn);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*****************************************************************************
Handle users statistics
*****************************************************************************/
/* 'mysql_system_user' is used for when the user is not defined for a THD. */
static const char mysql_system_user[]= "#mysql_system#";
// Returns 'user' if it's not NULL. Returns 'mysql_system_user' otherwise.
static const char * get_valid_user_string(char* user)
{
return user ? user : mysql_system_user;
}
/*
Returns string as 'IP' for the client-side of the connection represented by
'client'. Does not allocate memory. May return "".
*/
static const char *get_client_host(THD *client)
{
return client->security_ctx->host_or_ip[0] ?
client->security_ctx->host_or_ip :
client->security_ctx->host ? client->security_ctx->host : "";
}
extern "C" uchar *get_key_user_stats(USER_STATS *user_stats, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= user_stats->user_name_length;
return (uchar*) user_stats->user;
}
void free_user_stats(USER_STATS* user_stats)
{
my_free(user_stats, MYF(0));
}
void init_user_stats(USER_STATS *user_stats,
const char *user,
size_t user_length,
const char *priv_user,
uint total_connections,
uint concurrent_connections,
time_t connected_time,
double busy_time,
double cpu_time,
ulonglong bytes_received,
ulonglong bytes_sent,
ulonglong binlog_bytes_written,
ha_rows rows_sent,
ha_rows rows_read,
ha_rows rows_inserted,
ha_rows rows_deleted,
ha_rows rows_updated,
ulonglong select_commands,
ulonglong update_commands,
ulonglong other_commands,
ulonglong commit_trans,
ulonglong rollback_trans,
ulonglong denied_connections,
ulonglong lost_connections,
ulonglong access_denied_errors,
ulonglong empty_queries)
{
DBUG_ENTER("init_user_stats");
DBUG_PRINT("enter", ("user: %s priv_user: %s", user, priv_user));
user_length= min(user_length, sizeof(user_stats->user)-1);
memcpy(user_stats->user, user, user_length);
user_stats->user[user_length]= 0;
user_stats->user_name_length= user_length;
strmake(user_stats->priv_user, priv_user, sizeof(user_stats->priv_user)-1);
user_stats->total_connections= total_connections;
user_stats->concurrent_connections= concurrent_connections;
user_stats->connected_time= connected_time;
user_stats->busy_time= busy_time;
user_stats->cpu_time= cpu_time;
user_stats->bytes_received= bytes_received;
user_stats->bytes_sent= bytes_sent;
user_stats->binlog_bytes_written= binlog_bytes_written;
user_stats->rows_sent= rows_sent;
user_stats->rows_updated= rows_updated;
user_stats->rows_read= rows_read;
user_stats->select_commands= select_commands;
user_stats->update_commands= update_commands;
user_stats->other_commands= other_commands;
user_stats->commit_trans= commit_trans;
user_stats->rollback_trans= rollback_trans;
user_stats->denied_connections= denied_connections;
user_stats->lost_connections= lost_connections;
user_stats->access_denied_errors= access_denied_errors;
user_stats->empty_queries= empty_queries;
DBUG_VOID_RETURN;
}
#ifdef COMPLEAT_PATCH_NOT_ADDED_YET
void add_user_stats(USER_STATS *user_stats,
uint total_connections,
uint concurrent_connections,
time_t connected_time,
double busy_time,
double cpu_time,
ulonglong bytes_received,
ulonglong bytes_sent,
ulonglong binlog_bytes_written,
ha_rows rows_sent,
ha_rows rows_read,
ha_rows rows_inserted,
ha_rows rows_deleted,
ha_rows rows_updated,
ulonglong select_commands,
ulonglong update_commands,
ulonglong other_commands,
ulonglong commit_trans,
ulonglong rollback_trans,
ulonglong denied_connections,
ulonglong lost_connections,
ulonglong access_denied_errors,
ulonglong empty_queries)
{
user_stats->total_connections+= total_connections;
user_stats->concurrent_connections+= concurrent_connections;
user_stats->connected_time+= connected_time;
user_stats->busy_time+= busy_time;
user_stats->cpu_time+= cpu_time;
user_stats->bytes_received+= bytes_received;
user_stats->bytes_sent+= bytes_sent;
user_stats->binlog_bytes_written+= binlog_bytes_written;
user_stats->rows_sent+= rows_sent;
user_stats->rows_inserted+= rows_inserted;
user_stats->rows_deleted+= rows_deleted;
user_stats->rows_updated+= rows_updated;
user_stats->rows_read+= rows_read;
user_stats->select_commands+= select_commands;
user_stats->update_commands+= update_commands;
user_stats->other_commands+= other_commands;
user_stats->commit_trans+= commit_trans;
user_stats->rollback_trans+= rollback_trans;
user_stats->denied_connections+= denied_connections;
user_stats->lost_connections+= lost_connections;
user_stats->access_denied_errors+= access_denied_errors;
user_stats->empty_queries+= empty_queries;
}
#endif
void init_global_user_stats(void)
{
if (hash_init(&global_user_stats, system_charset_info, max_connections,
0, 0, (hash_get_key) get_key_user_stats,
(hash_free_key)free_user_stats, 0))
{
sql_print_error("Initializing global_user_stats failed.");
exit(1);
}
}
void init_global_client_stats(void)
{
if (hash_init(&global_client_stats, system_charset_info, max_connections,
0, 0, (hash_get_key) get_key_user_stats,
(hash_free_key)free_user_stats, 0))
{
sql_print_error("Initializing global_client_stats failed.");
exit(1);
}
}
extern "C" uchar *get_key_table_stats(TABLE_STATS *table_stats, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= table_stats->table_name_length;
return (uchar*) table_stats->table;
}
extern "C" void free_table_stats(TABLE_STATS* table_stats)
{
my_free(table_stats, MYF(0));
}
void init_global_table_stats(void)
{
if (hash_init(&global_table_stats, system_charset_info, max_connections,
0, 0, (hash_get_key) get_key_table_stats,
(hash_free_key)free_table_stats, 0)) {
sql_print_error("Initializing global_table_stats failed.");
exit(1);
}
}
extern "C" uchar *get_key_index_stats(INDEX_STATS *index_stats, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= index_stats->index_name_length;
return (uchar*) index_stats->index;
}
extern "C" void free_index_stats(INDEX_STATS* index_stats)
{
my_free(index_stats, MYF(0));
}
void init_global_index_stats(void)
{
if (hash_init(&global_index_stats, system_charset_info, max_connections,
0, 0, (hash_get_key) get_key_index_stats,
(hash_free_key)free_index_stats, 0))
{
sql_print_error("Initializing global_index_stats failed.");
exit(1);
}
}
void free_global_user_stats(void)
{
hash_free(&global_user_stats);
}
void free_global_table_stats(void)
{
hash_free(&global_table_stats);
}
void free_global_index_stats(void)
{
hash_free(&global_index_stats);
}
void free_global_client_stats(void)
{
hash_free(&global_client_stats);
}
/*
Increments the global stats connection count for an entry from
global_client_stats or global_user_stats. Returns 0 on success
and 1 on error.
*/
static bool increment_count_by_name(const char *name, size_t name_length,
const char *role_name,
HASH *users_or_clients, THD *thd)
{
USER_STATS *user_stats;
if (!(user_stats= (USER_STATS*) hash_search(users_or_clients, (uchar*) name,
name_length)))
{
/* First connection for this user or client */
if (!(user_stats= ((USER_STATS*)
my_malloc(sizeof(USER_STATS),
MYF(MY_WME | MY_ZEROFILL)))))
return TRUE; // Out of memory
init_user_stats(user_stats, name, name_length, role_name,
0, 0, // connections
0, 0, 0, // time
0, 0, 0, // bytes sent, received and written
0, 0, // Rows sent and read
0, 0, 0, // rows inserted, deleted and updated
0, 0, 0, // select, update and other commands
0, 0, // commit and rollback trans
thd->status_var.access_denied_errors,
0, // lost connections
0, // access denied errors
0); // empty queries
if (my_hash_insert(users_or_clients, (uchar*)user_stats))
{
my_free(user_stats, 0);
return TRUE; // Out of memory
}
}
user_stats->total_connections++;
return FALSE;
}
/*
Increments the global user and client stats connection count.
@param use_lock if true, LOCK_global_user_client_stats will be locked
@retval 0 ok
@retval 1 error.
*/
#ifndef EMBEDDED_LIBRARY
static bool increment_connection_count(THD* thd, bool use_lock)
{
const char *user_string= get_valid_user_string(thd->main_security_ctx.user);
const char *client_string= get_client_host(thd);
bool return_value= FALSE;
if (!thd->userstat_running)
return FALSE;
if (use_lock)
pthread_mutex_lock(&LOCK_global_user_client_stats);
if (increment_count_by_name(user_string, strlen(user_string), user_string,
&global_user_stats, thd))
{
return_value= TRUE;
goto end;
}
if (increment_count_by_name(client_string, strlen(client_string),
user_string, &global_client_stats, thd))
{
return_value= TRUE;
goto end;
}
end:
if (use_lock)
pthread_mutex_unlock(&LOCK_global_user_client_stats);
return return_value;
}
#endif
/*
Used to update the global user and client stats
*/
static void update_global_user_stats_with_user(THD *thd,
USER_STATS *user_stats,
time_t now)
{
DBUG_ASSERT(thd->userstat_running);
user_stats->connected_time+= now - thd->last_global_update_time;
user_stats->busy_time+= (thd->status_var.busy_time -
thd->org_status_var.busy_time);
user_stats->cpu_time+= (thd->status_var.cpu_time -
thd->org_status_var.cpu_time);
/*
This is handle specially as bytes_recieved is incremented BEFORE
org_status_var is copied.
*/
user_stats->bytes_received+= (thd->org_status_var.bytes_received-
thd->start_bytes_received);
user_stats->bytes_sent+= (thd->status_var.bytes_sent -
thd->org_status_var.bytes_sent);
user_stats->binlog_bytes_written+=
(thd->status_var.binlog_bytes_written -
thd->org_status_var.binlog_bytes_written);
user_stats->rows_read+= (thd->status_var.rows_read -
thd->org_status_var.rows_read);
user_stats->rows_sent+= (thd->status_var.rows_sent -
thd->org_status_var.rows_sent);
user_stats->rows_inserted+= (thd->status_var.ha_write_count -
thd->org_status_var.ha_write_count);
user_stats->rows_deleted+= (thd->status_var.ha_delete_count -
thd->org_status_var.ha_delete_count);
user_stats->rows_updated+= (thd->status_var.ha_update_count -
thd->org_status_var.ha_update_count);
user_stats->select_commands+= thd->select_commands;
user_stats->update_commands+= thd->update_commands;
user_stats->other_commands+= thd->other_commands;
user_stats->commit_trans+= (thd->status_var.ha_commit_count -
thd->org_status_var.ha_commit_count);
user_stats->rollback_trans+= (thd->status_var.ha_rollback_count +
thd->status_var.ha_savepoint_rollback_count -
thd->org_status_var.ha_rollback_count -
thd->org_status_var.
ha_savepoint_rollback_count);
user_stats->access_denied_errors+=
(thd->status_var.access_denied_errors -
thd->org_status_var.access_denied_errors);
user_stats->empty_queries+= (thd->status_var.empty_queries -
thd->org_status_var.empty_queries);
/* The following can only contain 0 or 1 and then connection ends */
user_stats->denied_connections+= thd->status_var.access_denied_errors;
user_stats->lost_connections+= thd->status_var.lost_connections;
}
/* Updates the global stats of a user or client */
void update_global_user_stats(THD *thd, bool create_user, time_t now)
{
const char *user_string, *client_string;
USER_STATS *user_stats;
size_t user_string_length, client_string_length;
DBUG_ASSERT(thd->userstat_running);
user_string= get_valid_user_string(thd->main_security_ctx.user);
user_string_length= strlen(user_string);
client_string= get_client_host(thd);
client_string_length= strlen(client_string);
pthread_mutex_lock(&LOCK_global_user_client_stats);
// Update by user name
if ((user_stats= (USER_STATS*) hash_search(&global_user_stats,
(uchar*) user_string,
user_string_length)))
{
/* Found user. */
update_global_user_stats_with_user(thd, user_stats, now);
}
else
{
/* Create the entry */
if (create_user)
{
increment_count_by_name(user_string, user_string_length, user_string,
&global_user_stats, thd);
}
}
/* Update by client IP */
if ((user_stats= (USER_STATS*)hash_search(&global_client_stats,
(uchar*) client_string,
client_string_length)))
{
// Found by client IP
update_global_user_stats_with_user(thd, user_stats, now);
}
else
{
// Create the entry
if (create_user)
{
increment_count_by_name(client_string, client_string_length,
user_string, &global_client_stats, thd);
}
}
/* Reset variables only used for counting */
thd->select_commands= thd->update_commands= thd->other_commands= 0;
thd->last_global_update_time= now;
pthread_mutex_unlock(&LOCK_global_user_client_stats);
}
void thd_init_client_charset(THD *thd, uint cs_number)
{
/*
Use server character set and collation if
- opt_character_set_client_handshake is not set
- client has not specified a character set
- client character set is the same as the servers
- client character set doesn't exists in server
*/
if (!opt_character_set_client_handshake ||
!(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
!my_strcasecmp(&my_charset_latin1,
global_system_variables.character_set_client->name,
thd->variables.character_set_client->name))
{
thd->variables.character_set_client=
global_system_variables.character_set_client;
thd->variables.collation_connection=
global_system_variables.collation_connection;
thd->variables.character_set_results=
global_system_variables.character_set_results;
}
else
{
thd->variables.character_set_results=
thd->variables.collation_connection=
thd->variables.character_set_client;
}
}
/*
Initialize connection threads
*/
bool init_new_connection_handler_thread()
{
pthread_detach_this_thread();
#if defined(__WIN__)
win_install_sigabrt_handler();
#else
/* Win32 calls this in pthread_create */
if (my_thread_init())
return 1;
#endif /* __WIN__ */
return 0;
}
/*
Perform handshake, authorize client and update thd ACL variables.
SYNOPSIS
check_connection()
thd thread handle
RETURN
0 success, OK is sent to user, thd is updated.
-1 error, which is sent to user
> 0 error code (not sent to user)
*/
#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
{
uint connect_errors= 0;
NET *net= &thd->net;
ulong pkt_len= 0;
char *end;
DBUG_PRINT("info",
("New connection received on %s", vio_description(net->vio)));
#ifdef SIGNAL_WITH_VIO_CLOSE
thd->set_active_vio(net->vio);
#endif
if (!thd->main_security_ctx.host) // If TCP/IP connection
{
char ip[30];
if (vio_peer_addr(net->vio, ip, &thd->peer_port))
{
my_error(ER_BAD_HOST_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
if (!(thd->main_security_ctx.ip= my_strdup(ip,MYF(MY_WME))))
return 1; /* The error is set by my_strdup(). */
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip;
vio_in_addr(net->vio,&thd->remote.sin_addr);
if (!(specialflag & SPECIAL_NO_RESOLVE))
{
vio_in_addr(net->vio,&thd->remote.sin_addr);
thd->main_security_ctx.host=
ip_to_hostname(&thd->remote.sin_addr, &connect_errors);
/* Cut very long hostnames to avoid possible overflows */
if (thd->main_security_ctx.host)
{
if (thd->main_security_ctx.host != my_localhost)
thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host),
HOSTNAME_LENGTH)]= 0;
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
}
if (connect_errors > max_connect_errors)
{
my_error(ER_HOST_IS_BLOCKED, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
}
DBUG_PRINT("info",("Host: %s ip: %s",
(thd->main_security_ctx.host ?
thd->main_security_ctx.host : "unknown host"),
(thd->main_security_ctx.ip ?
thd->main_security_ctx.ip : "unknown ip")));
if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
{
my_error(ER_HOST_NOT_PRIVILEGED, MYF(0),
thd->main_security_ctx.host_or_ip);
return 1;
}
}
else /* Hostname given means that the connection was on a socket */
{
DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
thd->main_security_ctx.ip= 0;
/* Reset sin_addr */
bzero((char*) &thd->remote, sizeof(thd->remote));
}
vio_keepalive(net->vio, TRUE);
ulong server_capabilites;
{
/* buff[] needs to big enough to hold the server_version variable */
char buff[SERVER_VERSION_LENGTH + 1 + SCRAMBLE_LENGTH + 1 + 64];
server_capabilites= CLIENT_BASIC_FLAGS;
if (opt_using_transactions)
server_capabilites|= CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
server_capabilites|= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
#ifdef HAVE_OPENSSL
if (ssl_acceptor_fd)
{
server_capabilites |= CLIENT_SSL; /* Wow, SSL is available! */
server_capabilites |= CLIENT_SSL_VERIFY_SERVER_CERT;
}
#endif /* HAVE_OPENSSL */
end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
int4store((uchar*) end, thd->thread_id);
end+= 4;
/*
So as check_connection is the only entry point to authorization
procedure, scramble is set here. This gives us new scramble for
each handshake.
*/
create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
/*
Old clients does not understand long scrambles, but can ignore packet
tail: that's why first part of the scramble is placed here, and second
part at the end of packet.
*/
end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
int2store(end, server_capabilites);
/* write server characteristics: up to 16 bytes allowed */
end[2]=(char) default_charset_info->number;
int2store(end+3, thd->server_status);
bzero(end+5, 13);
end+= 18;
/* write scramble tail */
end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323,
SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;
/* At this point we write connection message and read reply */
if (net_write_command(net, (uchar) protocol_version, (uchar*) "", 0,
(uchar*) buff, (size_t) (end-buff)) ||
(pkt_len= my_net_read(net)) == packet_error ||
pkt_len < MIN_HANDSHAKE_SIZE)
{
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0),
thd->main_security_ctx.host_or_ip);
return 1;
}
}
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
if (connect_errors)
reset_host_errors(&thd->remote.sin_addr);
if (thd->packet.alloc(thd->variables.net_buffer_length))
return 1; /* The error is set by alloc(). */
thd->client_capabilities= uint2korr(net->read_pos);
if (thd->client_capabilities & CLIENT_PROTOCOL_41)
{
thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
thd->max_client_packet_length= uint4korr(net->read_pos+4);
DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
thd_init_client_charset(thd, (uint) net->read_pos[8]);
thd->update_charset();
end= (char*) net->read_pos+32;
}
else
{
thd->max_client_packet_length= uint3korr(net->read_pos+2);
end= (char*) net->read_pos+5;
}
/*
Disable those bits which are not supported by the server.
This is a precautionary measure, if the client lies. See Bug#27944.
*/
thd->client_capabilities&= server_capabilites;
if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
thd->variables.sql_mode|= MODE_IGNORE_SPACE;
#ifdef HAVE_OPENSSL
DBUG_PRINT("info", ("client capabilities: %lu", thd->client_capabilities));
if (thd->client_capabilities & CLIENT_SSL)
{
char error_string[1024];
/* Do the SSL layering. */
if (!ssl_acceptor_fd)
{
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
DBUG_PRINT("info", ("IO layer change in progress..."));
if (sslaccept(ssl_acceptor_fd, net->vio, net->read_timeout, error_string))
{
DBUG_PRINT("error", ("Failed to accept new SSL connection"));
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
DBUG_PRINT("info", ("Reading user information over SSL layer"));
if ((pkt_len= my_net_read(net)) == packet_error ||
pkt_len < NORMAL_HANDSHAKE_SIZE)
{
DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
pkt_len));
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
}
#endif /* HAVE_OPENSSL */
if (end >= (char*) net->read_pos+ pkt_len +2)
{
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
if (thd->client_capabilities & CLIENT_INTERACTIVE)
thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
opt_using_transactions)
net->return_status= &thd->server_status;
char *user= end;
char *passwd= strend(user)+1;
uint user_len= passwd - user - 1;
char *db= passwd;
char db_buff[NAME_LEN + 1]; // buffer to store db in utf8
char user_buff[USERNAME_LENGTH + 1]; // buffer to store user in utf8
uint dummy_errors;
/*
Old clients send null-terminated string as password; new clients send
the size (1 byte) + string (not null-terminated). Hence in case of empty
password both send '\0'.
This strlen() can't be easily deleted without changing protocol.
Cast *passwd to an unsigned char, so that it doesn't extend the sign for
*passwd > 127 and become 2**32-127+ after casting to uint.
*/
uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
(uchar)(*passwd++) : strlen(passwd);
db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
db + passwd_len + 1 : 0;
/* strlen() can't be easily deleted without changing protocol */
uint db_len= db ? strlen(db) : 0;
if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len)
{
inc_host_errors(&thd->remote.sin_addr);
my_error(ER_HANDSHAKE_ERROR, MYF(0), thd->main_security_ctx.host_or_ip);
return 1;
}
/* Since 4.1 all database names are stored in utf8 */
if (db)
{
db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
system_charset_info,
db, db_len,
thd->charset(), &dummy_errors)]= 0;
db= db_buff;
}
user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
system_charset_info, user, user_len,
thd->charset(), &dummy_errors)]= '\0';
user= user_buff;
/* If username starts and ends in "'", chop them off */
if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
{
user[user_len-1]= 0;
user++;
user_len-= 2;
}
if (thd->main_security_ctx.user)
x_free(thd->main_security_ctx.user);
if (!(thd->main_security_ctx.user= my_strdup(user, MYF(MY_WME))))
return 1; /* The error is set by my_strdup(). */
return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
}
/*
Setup thread to be used with the current thread
SYNOPSIS
bool setup_connection_thread_globals()
thd Thread/connection handler
RETURN
0 ok
1 Error (out of memory)
In this case we will close the connection and increment status
*/
bool setup_connection_thread_globals(THD *thd)
{
if (thd->store_globals())
{
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
statistic_increment(aborted_connects,&LOCK_status);
thd->scheduler->end_thread(thd, 0);
return 1; // Error
}
return 0;
}
/*
Autenticate user, with error reporting
SYNOPSIS
login_connection()
thd Thread handler
NOTES
Connection is not closed in case of errors
RETURN
0 ok
1 error
*/
bool login_connection(THD *thd)
{
NET *net= &thd->net;
int error;
DBUG_ENTER("login_connection");
DBUG_PRINT("info", ("login_connection called by thread %lu",
thd->thread_id));
/* Use "connect_timeout" value during connection phase */
my_net_set_read_timeout(net, connect_timeout);
my_net_set_write_timeout(net, connect_timeout);
error= check_connection(thd);
net_end_statement(thd);
if (error)
{ // Wrong permissions
#ifdef __NT__
if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
my_sleep(1000); /* must wait after eof() */
#endif
statistic_increment(aborted_connects,&LOCK_status);
DBUG_RETURN(1);
}
/* Connect completed, set read/write timeouts back to default */
my_net_set_read_timeout(net, thd->variables.net_read_timeout);
my_net_set_write_timeout(net, thd->variables.net_write_timeout);
/* Updates global user connection stats. */
if (increment_connection_count(thd, TRUE))
{
net_send_error(thd, ER_OUTOFMEMORY); // Out of memory
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/*
Close an established connection
NOTES
This mainly updates status variables
*/
void end_connection(THD *thd)
{
NET *net= &thd->net;
plugin_thdvar_cleanup(thd);
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
if (thd->killed || (net->error && net->vio != 0))
{
statistic_increment(aborted_threads,&LOCK_status);
status_var_increment(thd->status_var.lost_connections);
}
if (net->error && net->vio != 0)
{
if (!thd->killed && thd->variables.log_warnings > 1)
{
Security_context *sctx= thd->security_ctx;
sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
thd->thread_id,(thd->db ? thd->db : "unconnected"),
sctx->user ? sctx->user : "unauthenticated",
sctx->host_or_ip,
(thd->main_da.is_error() ? thd->main_da.message() :
ER(ER_UNKNOWN_ERROR)));
}
}
}
/*
Initialize THD to handle queries
*/
void prepare_new_connection_state(THD* thd)
{
Security_context *sctx= thd->security_ctx;
#ifdef __NETWARE__
netware_reg_user(sctx->ip, sctx->user, "MySQL");
#endif
if (thd->variables.max_join_size == HA_POS_ERROR)
thd->options |= OPTION_BIG_SELECTS;
if (thd->client_capabilities & CLIENT_COMPRESS)
thd->net.compress=1; // Use compression
/*
Much of this is duplicated in create_embedded_thd() for the
embedded server library.
TODO: refactor this to avoid code duplication there
*/
thd->version= refresh_version;
thd->proc_info= 0;
thd->command= COM_SLEEP;
thd->set_time();
thd->init_for_queries();
if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
{
execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
if (thd->is_error())
{
thd->killed= THD::KILL_CONNECTION;
sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
thd->thread_id,(thd->db ? thd->db : "unconnected"),
sctx->user ? sctx->user : "unauthenticated",
sctx->host_or_ip, "init_connect command failed");
sql_print_warning("%s", thd->main_da.message());
}
thd->proc_info=0;
thd->set_time();
thd->init_for_queries();
}
}
/*
Thread handler for a connection
SYNOPSIS
handle_one_connection()
arg Connection object (THD)
IMPLEMENTATION
This function (normally) does the following:
- Initialize thread
- Initialize THD to be used with this thread
- Authenticate user
- Execute all queries sent on the connection
- Take connection down
- End thread / Handle next connection using thread from thread cache
*/
pthread_handler_t handle_one_connection(void *arg)
{
THD *thd= (THD*) arg;
thd->thr_create_utime= my_micro_time();
if (thread_scheduler.init_new_connection_thread())
{
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
statistic_increment(aborted_connects,&LOCK_status);
thd->scheduler->end_thread(thd,0);
return 0;
}
/*
If a thread was created to handle this connection:
increment slow_launch_threads counter if it took more than
slow_launch_time seconds to create the thread.
*/
if (thd->prior_thr_create_utime)
{
ulong launch_time= (ulong) (thd->thr_create_utime -
thd->prior_thr_create_utime);
if (launch_time >= slow_launch_time*1000000L)
statistic_increment(slow_launch_threads, &LOCK_status);
thd->prior_thr_create_utime= 0;
}
/*
handle_one_connection() is normally the only way a thread would
start and would always be on the very high end of the stack ,
therefore, the thread stack always starts at the address of the
first local variable of handle_one_connection, which is thd. We
need to know the start of the stack so that we could check for
stack overruns.
*/
thd->thread_stack= (char*) &thd;
if (setup_connection_thread_globals(thd))
return 0;
for (;;)
{
NET *net= &thd->net;
bool create_user= TRUE;
lex_start(thd);
if (login_connection(thd))
{
create_user= FALSE;
goto end_thread;
}
prepare_new_connection_state(thd);
while (!net->error && net->vio != 0 &&
!(thd->killed == THD::KILL_CONNECTION))
{
if (do_command(thd))
break;
}
end_connection(thd);
end_thread:
close_connection(thd, 0, 1);
if (thd->userstat_running)
update_global_user_stats(thd, create_user, time(NULL));
if (thd->scheduler->end_thread(thd,1))
return 0; // Probably no-threads
/*
If end_thread() returns, this thread has been schedule to
handle the next connection.
*/
thd= current_thd;
thd->thread_stack= (char*) &thd;
}
}
#endif /* EMBEDDED_LIBRARY */
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