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client.cc
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/* Copyright (c) 2003, 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.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
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 */
/*
This file is included by both libmysql.c (the MySQL client C API)
and the mysqld server to connect to another MYSQL server.
The differences for the two cases are:
- Things that only works for the client:
- Trying to automatically determine user name if not supplied to
mysql_real_connect()
- Support for reading local file with LOAD DATA LOCAL
- SHARED memory handling
- Prepared statements
- Things that only works for the server
In all other cases, code should be identical for the client and
server.
*/
#include <openssl/opensslv.h>
#include <stdarg.h>
#include <sys/types.h>
#include "m_ctype.h"
#include "m_string.h"
#include "my_config.h"
#include "my_sys.h"
#include "mysys_err.h"
#ifndef _WIN32
#include <netdb.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <stdio.h>
#include <algorithm>
#include <fstream>
#include <ios>
#include <iostream>
#include <string>
#include "base64.h"
#include "client_async_authentication.h"
#include "compression.h" // validate_compression_attributes
#include "errmsg.h"
#include "lex_string.h"
#include "map_helpers.h"
#include "my_byteorder.h"
#include "my_compiler.h"
#include "my_config.h"
#include "my_dbug.h"
#include "my_default.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_loglevel.h"
#include "my_macros.h"
#include "my_openssl_fips.h" // OPENSSL_ERROR_LENGTH, set_fips_mode
#include "my_psi_config.h"
#include "my_shm_defaults.h"
#include "mysql.h"
#include "mysql/client_authentication.h"
#include "mysql/plugin_auth_common.h"
#include "mysql/psi/mysql_memory.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql_version.h"
#include "mysqld_error.h"
#include "template_utils.h"
#include "typelib.h"
#include "violite.h"
#if !defined(_WIN32)
#include "my_thread.h" /* because of signal()*/
#endif /* !defined(_WIN32) */
#include <signal.h>
#include <sys/stat.h>
#include <time.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifndef _WIN32
#include <errno.h>
#define INVALID_SOCKET -1
#endif
#include <mysql/client_plugin.h>
#include <openssl/x509v3.h>
#include <new>
#include "../libmysql/init_commands_array.h"
#include "../libmysql/mysql_trace.h" /* MYSQL_TRACE() instrumentation */
#include "sql_common.h"
#ifdef MYSQL_SERVER
#include "mysql_com_server.h"
#include "sql/client_settings.h"
#include "sql/server_component/mysql_command_services_imp.h"
/* mysql_command_service_extn */
#else
#include "libmysql/client_settings.h"
#endif
#include "client_extensions_macros.h"
#include "sql/log_event.h" /* Log_event_type */
#include "sql/rpl_constants.h" /* mysql_binlog_XXX() */
using std::string;
using std::swap;
#define STATE_DATA(M) \
(NULL != (M) ? &(MYSQL_EXTENSION_PTR(M)->state_change) : NULL)
#define ADD_INFO(M, element, type) \
{ \
M = STATE_DATA(mysql); \
M->info_list[type].head_node = \
list_add(M->info_list[type].head_node, element); \
}
#define native_password_plugin_name "mysql_native_password"
#define caching_sha2_password_plugin_name "caching_sha2_password"
PSI_memory_key key_memory_mysql_options;
PSI_memory_key key_memory_MYSQL_DATA;
PSI_memory_key key_memory_MYSQL;
PSI_memory_key key_memory_MYSQL_RES;
PSI_memory_key key_memory_MYSQL_ROW;
PSI_memory_key key_memory_MYSQL_state_change_info;
PSI_memory_key key_memory_MYSQL_HANDSHAKE;
PSI_memory_key key_memory_MYSQL_ssl_session_data;
#if defined(_WIN32)
PSI_memory_key key_memory_create_shared_memory;
#endif /* _WIN32 */
#ifdef HAVE_PSI_INTERFACE
/*
This code is common to the client and server,
and also used in the server when server A connects to server B,
for example with replication.
Therefore, the code is also instrumented.
*/
static PSI_memory_info all_client_memory[] = {
#if defined(_WIN32)
{&key_memory_create_shared_memory, "create_shared_memory", 0, 0,
PSI_DOCUMENT_ME},
#endif /* _WIN32 */
{&key_memory_mysql_options, "mysql_options", 0, 0, PSI_DOCUMENT_ME},
{&key_memory_MYSQL_DATA, "MYSQL_DATA", 0, 0, PSI_DOCUMENT_ME},
{&key_memory_MYSQL, "MYSQL", 0, 0, PSI_DOCUMENT_ME},
{&key_memory_MYSQL_RES, "MYSQL_RES", 0, 0, PSI_DOCUMENT_ME},
{&key_memory_MYSQL_ROW, "MYSQL_ROW", 0, 0, PSI_DOCUMENT_ME},
{&key_memory_MYSQL_state_change_info, "MYSQL_STATE_CHANGE_INFO", 0, 0,
PSI_DOCUMENT_ME},
{&key_memory_MYSQL_HANDSHAKE, "MYSQL_HANDSHAKE", 0, 0, PSI_DOCUMENT_ME},
{&key_memory_MYSQL_ssl_session_data, "MYSQL_SSL_session", 0, 0,
"Saved SSL sessions"}};
void init_client_psi_keys(void) {
const char *category = "client";
int count;
count = static_cast<int>(array_elements(all_client_memory));
mysql_memory_register(category, all_client_memory, count);
}
#endif /* HAVE_PSI_INTERFACE */
/* SSL_SESSION_is_resumable is openssl 1.1.1+ */
#if OPENSSL_VERSION_NUMBER < 0x10101000L
#define SSL_SESSION_is_resumable(x) true
#endif
uint mysql_port = 0;
char *mysql_unix_port = nullptr;
const char *unknown_sqlstate = "HY000";
const char *not_error_sqlstate = "00000";
const char *cant_connect_sqlstate = "08001";
#if defined(_WIN32)
const char *def_shared_memory_base_name = default_shared_memory_base_name;
#endif
ulong g_net_buffer_length = 8192;
ulong g_max_allowed_packet = 1024L * 1024L * 1024L;
static void mysql_prune_stmt_list(MYSQL *mysql);
static int read_com_query_metadata(MYSQL *mysql, uchar *pos, ulong field_count);
CHARSET_INFO *default_client_charset_info = &my_charset_latin1;
/* Server error code and message */
unsigned int mysql_server_last_errno;
char mysql_server_last_error[MYSQL_ERRMSG_SIZE];
/* forward declaration */
static int read_one_row(MYSQL *mysql, uint fields, MYSQL_ROW row,
ulong *lengths);
static net_async_status read_one_row_nonblocking(MYSQL *mysql, uint fields,
MYSQL_ROW row, ulong *lengths,
int *res);
/**
Free async_qp_data buffer in async_context.
@param async_context pointer to asynchronous context structure
*/
void inline free_async_qp_data(MYSQL_ASYNC *async_context) {
if (async_context->async_qp_data) {
my_free(async_context->async_qp_data);
async_context->async_qp_data = nullptr;
async_context->async_qp_data_length = 0;
}
}
/**
Set async_context to idle status, free async_qp_data buffer.
@param async_context pointer to asynchronous context structure
*/
void inline set_query_idle(MYSQL_ASYNC *async_context) {
async_context->async_op_status = ASYNC_OP_UNSET;
async_context->async_query_state = QUERY_IDLE;
async_context->async_query_length = 0;
DBUG_PRINT("async", ("set state=%d", async_context->async_query_state));
free_async_qp_data(async_context);
}
/**
Convert the connect timeout option to a timeout value for VIO
functions (vio_socket_connect() and vio_io_wait()).
@param mysql Connection handle (client side).
@return The timeout value in milliseconds, or -1 if no timeout.
*/
static int get_vio_connect_timeout(MYSQL *mysql) {
int timeout_ms;
uint timeout_sec;
/*
A timeout of 0 means no timeout. Also, the connect_timeout
option value is in seconds, while VIO timeouts are measured
in milliseconds. Hence, check for a possible overflow. In
case of overflow, set to no timeout.
*/
timeout_sec = mysql->options.connect_timeout;
if (!timeout_sec || (timeout_sec > INT_MAX / 1000))
timeout_ms = -1;
else
timeout_ms = (int)(timeout_sec * 1000);
return timeout_ms;
}
#ifdef _WIN32
/**
Convert the connect timeout option to a timeout value for WIN32
synchronization functions.
@remark Specific for WIN32 connection methods shared memory and
named pipe.
@param mysql Connection handle (client side).
@return The timeout value in milliseconds, or INFINITE if no timeout.
*/
static DWORD get_win32_connect_timeout(MYSQL *mysql) {
DWORD timeout_ms;
uint timeout_sec;
/*
A timeout of 0 means no timeout. Also, the connect_timeout
option value is in seconds, while WIN32 timeouts are in
milliseconds. Hence, check for a possible overflow. In case
of overflow, set to no timeout.
*/
timeout_sec = mysql->options.connect_timeout;
if (!timeout_sec || (timeout_sec > INT_MAX / 1000))
timeout_ms = INFINITE;
else
timeout_ms = (DWORD)(timeout_sec * 1000);
return timeout_ms;
}
#endif
/**
Set the internal error message to mysql handler
@param mysql connection handle (client side)
@param errcode CR_ error code, passed to ER macro to get
error text
@param sqlstate SQL standard sqlstate
*/
void set_mysql_error(MYSQL *mysql, int errcode, const char *sqlstate) {
NET *net;
DBUG_TRACE;
DBUG_PRINT("enter", ("error :%d '%s'", errcode, ER_CLIENT(errcode)));
assert(mysql != nullptr);
if (mysql) {
net = &mysql->net;
net->last_errno = errcode;
my_stpcpy(net->last_error, ER_CLIENT(errcode));
my_stpcpy(net->sqlstate, sqlstate);
MYSQL_TRACE(ERROR, mysql, ());
} else {
mysql_server_last_errno = errcode;
my_stpcpy(mysql_server_last_error, ER_CLIENT(errcode));
}
}
/**
Is this NET instance initialized?
@c my_net_init() and net_end()
*/
static bool my_net_is_inited(NET *net) { return net->buff != nullptr; }
/**
Clear possible error state of struct NET
@param net clear the state of the argument
*/
void net_clear_error(NET *net) {
net->last_errno = 0;
net->last_error[0] = '\0';
my_stpcpy(net->sqlstate, not_error_sqlstate);
}
/**
Set an error message on the client.
@param mysql connection handle
@param errcode CR_* errcode, for client errors
@param sqlstate SQL standard sql state, unknown_sqlstate for the
majority of client errors.
@param format error message template, in sprintf format
@param ... variable number of arguments
*/
void set_mysql_extended_error(MYSQL *mysql, int errcode, const char *sqlstate,
const char *format, ...) {
NET *net;
va_list args;
DBUG_TRACE;
DBUG_PRINT("enter", ("error :%d '%s'", errcode, format));
assert(mysql != nullptr);
net = &mysql->net;
net->last_errno = errcode;
va_start(args, format);
vsnprintf(net->last_error, sizeof(net->last_error) - 1, format, args);
va_end(args);
my_stpcpy(net->sqlstate, sqlstate);
MYSQL_TRACE(ERROR, mysql, ());
}
/*
Create a named pipe connection
*/
#ifdef _WIN32
static HANDLE create_named_pipe(MYSQL *mysql, DWORD connect_timeout,
const char **arg_host,
const char **arg_unix_socket) {
HANDLE hPipe = INVALID_HANDLE_VALUE;
char pipe_name[1024];
DWORD dwMode;
int i;
const char *host = *arg_host, *unix_socket = *arg_unix_socket;
if (!unix_socket || (unix_socket)[0] == 0x00) unix_socket = mysql_unix_port;
if (!host || !strcmp(host, LOCAL_HOST)) host = LOCAL_HOST_NAMEDPIPE;
pipe_name[sizeof(pipe_name) - 1] = 0; /* Safety if too long string */
strxnmov(pipe_name, sizeof(pipe_name) - 1, "\\\\.\\pipe\\", unix_socket,
NullS);
DBUG_PRINT("info", ("Server name: '%s'. Named Pipe: %s", host, unix_socket));
for (i = 0; i < 100; i++) /* Don't retry forever */
{
if ((hPipe = CreateFile(pipe_name,
FILE_READ_ATTRIBUTES | FILE_READ_DATA |
FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA,
0, NULL, OPEN_EXISTING,
FILE_FLAG_OVERLAPPED | SECURITY_SQOS_PRESENT |
SECURITY_IDENTIFICATION,
NULL)) != INVALID_HANDLE_VALUE)
break;
if (GetLastError() != ERROR_PIPE_BUSY) {
set_mysql_extended_error(mysql, CR_NAMEDPIPEOPEN_ERROR, unknown_sqlstate,
ER_CLIENT(CR_NAMEDPIPEOPEN_ERROR), host,
unix_socket, (ulong)GetLastError());
return INVALID_HANDLE_VALUE;
}
/* wait for for an other instance */
if (!WaitNamedPipe(pipe_name, connect_timeout)) {
set_mysql_extended_error(mysql, CR_NAMEDPIPEWAIT_ERROR, unknown_sqlstate,
ER_CLIENT(CR_NAMEDPIPEWAIT_ERROR), host,
unix_socket, (ulong)GetLastError());
return INVALID_HANDLE_VALUE;
}
}
if (hPipe == INVALID_HANDLE_VALUE) {
set_mysql_extended_error(mysql, CR_NAMEDPIPEOPEN_ERROR, unknown_sqlstate,
ER_CLIENT(CR_NAMEDPIPEOPEN_ERROR), host,
unix_socket, (ulong)GetLastError());
return INVALID_HANDLE_VALUE;
}
dwMode = PIPE_READMODE_BYTE | PIPE_WAIT;
if (!SetNamedPipeHandleState(hPipe, &dwMode, NULL, NULL)) {
CloseHandle(hPipe);
set_mysql_extended_error(mysql, CR_NAMEDPIPESETSTATE_ERROR,
unknown_sqlstate,
ER_CLIENT(CR_NAMEDPIPESETSTATE_ERROR), host,
unix_socket, (ulong)GetLastError());
return INVALID_HANDLE_VALUE;
}
*arg_host = host;
*arg_unix_socket = unix_socket; /* connect arg */
return (hPipe);
}
#endif
/*
Create new shared memory connection, return handler of connection
@param mysql Pointer of mysql structure
@param net Pointer of net structure
@param connect_timeout Timeout of connection (in milliseconds)
@return HANDLE to the shared memory area.
*/
#if defined(_WIN32)
static HANDLE create_shared_memory(MYSQL *mysql, NET *net,
DWORD connect_timeout) {
ulong smem_buffer_length = shared_memory_buffer_length + 4;
/*
event_connect_request is event object for start connection actions
event_connect_answer is event object for confirm, that server put data
handle_connect_file_map is file-mapping object, use for create shared
memory
handle_connect_map is pointer on shared memory
handle_map is pointer on shared memory for client
event_server_wrote,
event_server_read,
event_client_wrote,
event_client_read are events for transfer data between server and client
handle_file_map is file-mapping object, use for create shared memory
*/
HANDLE event_connect_request = NULL;
HANDLE event_connect_answer = NULL;
HANDLE handle_connect_file_map = NULL;
char *handle_connect_map = NULL;
char *handle_map = NULL;
HANDLE event_server_wrote = NULL;
HANDLE event_server_read = NULL;
HANDLE event_client_wrote = NULL;
HANDLE event_client_read = NULL;
HANDLE event_conn_closed = NULL;
HANDLE handle_file_map = NULL;
HANDLE connect_named_mutex = NULL;
ulong connect_number;
char connect_number_char[22], *p;
char *tmp = NULL;
char *suffix_pos = NULL;
DWORD error_allow = 0;
DWORD error_code = 0;
DWORD event_access_rights = SYNCHRONIZE | EVENT_MODIFY_STATE;
char *shared_memory_base_name = mysql->options.shared_memory_base_name;
static const char *name_prefixes[] = {"", "Global\\"};
const char *prefix;
/*
If this is NULL, somebody freed the MYSQL* options. mysql_close()
is a good candidate. We don't just silently (re)set it to
def_shared_memory_base_name as that would create really confusing/buggy
behavior if the user passed in a different name on the command-line or
in a my.cnf.
*/
assert(shared_memory_base_name != NULL);
/*
get enough space base-name + '_' + longest suffix we might ever send
*/
if (!(tmp = (char *)my_malloc(key_memory_create_shared_memory,
strlen(shared_memory_base_name) + 32L,
MYF(MY_FAE))))
goto err;
/*
The name of event and file-mapping events create agree next rule:
shared_memory_base_name+unique_part
Where:
shared_memory_base_name is unique value for each server
unique_part is uniquel value for each object (events and file-mapping)
*/
for (size_t i = 0; i < array_elements(name_prefixes); i++) {
prefix = name_prefixes[i];
suffix_pos = strxmov(tmp, prefix, shared_memory_base_name, "_", NullS);
my_stpcpy(suffix_pos, "CONNECT_REQUEST");
event_connect_request = OpenEvent(event_access_rights, false, tmp);
if (event_connect_request) {
break;
}
}
if (!event_connect_request) {
error_allow = CR_SHARED_MEMORY_CONNECT_REQUEST_ERROR;
goto err;
}
assert(suffix_pos != nullptr);
my_stpcpy(suffix_pos, "CONNECT_ANSWER");
if (!(event_connect_answer = OpenEvent(event_access_rights, false, tmp))) {
error_allow = CR_SHARED_MEMORY_CONNECT_ANSWER_ERROR;
goto err;
}
my_stpcpy(suffix_pos, "CONNECT_DATA");
if (!(handle_connect_file_map =
OpenFileMapping(FILE_MAP_WRITE, false, tmp))) {
error_allow = CR_SHARED_MEMORY_CONNECT_FILE_MAP_ERROR;
goto err;
}
if (!(handle_connect_map = static_cast<char *>(MapViewOfFile(
handle_connect_file_map, FILE_MAP_WRITE, 0, 0, sizeof(DWORD))))) {
error_allow = CR_SHARED_MEMORY_CONNECT_MAP_ERROR;
goto err;
}
my_stpcpy(suffix_pos, "CONNECT_NAMED_MUTEX");
connect_named_mutex = OpenMutex(SYNCHRONIZE, false, tmp);
if (connect_named_mutex == NULL) {
error_allow = CR_SHARED_MEMORY_CONNECT_SET_ERROR;
goto err;
}
if (WaitForSingleObject(connect_named_mutex, connect_timeout) !=
WAIT_OBJECT_0) {
error_allow = CR_SHARED_MEMORY_CONNECT_ABANDONED_ERROR;
goto err;
}
/* Send to server request of connection */
if (!SetEvent(event_connect_request)) {
error_allow = CR_SHARED_MEMORY_CONNECT_SET_ERROR;
goto err;
}
/* Wait of answer from server */
if (WaitForSingleObject(event_connect_answer, connect_timeout) !=
WAIT_OBJECT_0) {
error_allow = CR_SHARED_MEMORY_CONNECT_ABANDONED_ERROR;
goto err;
}
/* Get number of connection */
connect_number = uint4korr(handle_connect_map); /*WAX2*/
ReleaseMutex(connect_named_mutex);
CloseHandle(connect_named_mutex);
connect_named_mutex = NULL;
p = longlong10_to_str(connect_number, connect_number_char, 10);
/*
The name of event and file-mapping events create agree next rule:
shared_memory_base_name+unique_part+number_of_connection
Where:
shared_memory_base_name is uniquel value for each server
unique_part is uniquel value for each object (events and file-mapping)
number_of_connection is number of connection between server and client
*/
suffix_pos = strxmov(tmp, prefix, shared_memory_base_name, "_",
connect_number_char, "_", NullS);
my_stpcpy(suffix_pos, "DATA");
if ((handle_file_map = OpenFileMapping(FILE_MAP_WRITE, false, tmp)) == NULL) {
error_allow = CR_SHARED_MEMORY_FILE_MAP_ERROR;
goto err2;
}
if ((handle_map = static_cast<char *>(MapViewOfFile(
handle_file_map, FILE_MAP_WRITE, 0, 0, smem_buffer_length))) ==
NULL) {
error_allow = CR_SHARED_MEMORY_MAP_ERROR;
goto err2;
}
my_stpcpy(suffix_pos, "SERVER_WROTE");
if ((event_server_wrote = OpenEvent(event_access_rights, false, tmp)) ==
NULL) {
error_allow = CR_SHARED_MEMORY_EVENT_ERROR;
goto err2;
}
my_stpcpy(suffix_pos, "SERVER_READ");
if ((event_server_read = OpenEvent(event_access_rights, false, tmp)) ==
NULL) {
error_allow = CR_SHARED_MEMORY_EVENT_ERROR;
goto err2;
}
my_stpcpy(suffix_pos, "CLIENT_WROTE");
if ((event_client_wrote = OpenEvent(event_access_rights, false, tmp)) ==
NULL) {
error_allow = CR_SHARED_MEMORY_EVENT_ERROR;
goto err2;
}
my_stpcpy(suffix_pos, "CLIENT_READ");
if ((event_client_read = OpenEvent(event_access_rights, false, tmp)) ==
NULL) {
error_allow = CR_SHARED_MEMORY_EVENT_ERROR;
goto err2;
}
my_stpcpy(suffix_pos, "CONNECTION_CLOSED");
if ((event_conn_closed = OpenEvent(event_access_rights, false, tmp)) ==
NULL) {
error_allow = CR_SHARED_MEMORY_EVENT_ERROR;
goto err2;
}
/*
Set event that server should send data
*/
SetEvent(event_server_read);
err2:
if (error_allow == 0) {
net->vio = vio_new_win32shared_memory(
handle_file_map, handle_map, event_server_wrote, event_server_read,
event_client_wrote, event_client_read, event_conn_closed);
} else {
error_code = GetLastError();
if (event_server_read) CloseHandle(event_server_read);
if (event_server_wrote) CloseHandle(event_server_wrote);
if (event_client_read) CloseHandle(event_client_read);
if (event_client_wrote) CloseHandle(event_client_wrote);
if (event_conn_closed) CloseHandle(event_conn_closed);
if (handle_map) UnmapViewOfFile(handle_map);
if (handle_file_map) CloseHandle(handle_file_map);
}
err:
my_free(tmp);
if (error_allow) error_code = GetLastError();
if (event_connect_request) CloseHandle(event_connect_request);
if (event_connect_answer) CloseHandle(event_connect_answer);
if (handle_connect_map) UnmapViewOfFile(handle_connect_map);
if (handle_connect_file_map) CloseHandle(handle_connect_file_map);
if (error_allow) {
if (connect_named_mutex) {
ReleaseMutex(connect_named_mutex);
CloseHandle(connect_named_mutex);
}
if (error_allow == CR_SHARED_MEMORY_EVENT_ERROR)
set_mysql_extended_error(mysql, error_allow, unknown_sqlstate,
ER_CLIENT(error_allow), suffix_pos, error_code);
else
set_mysql_extended_error(mysql, error_allow, unknown_sqlstate,
ER_CLIENT(error_allow), error_code);
return (INVALID_HANDLE_VALUE);
}
return (handle_map);
}
#endif
/*
Free all memory acquired to store state change information.
*/
static void free_state_change_info(MYSQL_EXTENSION *ext) {
STATE_INFO *info;
int i;
if (ext)
info = &ext->state_change;
else
return;
for (i = SESSION_TRACK_SYSTEM_VARIABLES; i <= SESSION_TRACK_END; i++) {
if (list_length(info->info_list[i].head_node) != 0) {
list_free(info->info_list[i].head_node, (uint)0);
}
}
memset(info, 0, sizeof(STATE_INFO));
}
/**
Helper function to check if the buffer has at least bytes remaining
If the buffer is too small it raises CR_MALFORMED_PACKET_ERROR.
@param mysql the handle that has the buffer
@param packet the current position in the buffer
@param packet_length the size of the packet
@param bytes the bytes that we want available
@retval true the buffer has that many bytes
@retval false the buffer has less bytes remaining
*/
inline bool buffer_check_remaining(MYSQL *mysql, uchar *packet,
ulong packet_length, size_t bytes) {
size_t remaining_bytes;
/* Check to avoid underflow */
if (packet_length < (ulong)(packet - mysql->net.read_pos)) {
set_mysql_error(mysql, CR_MALFORMED_PACKET, unknown_sqlstate);
return false;
}
remaining_bytes = packet_length - (packet - mysql->net.read_pos);
if (remaining_bytes < bytes) {
set_mysql_error(mysql, CR_MALFORMED_PACKET, unknown_sqlstate);
return false;
}
return true;
}
/*
Helper function to safely read a variable size from a buffer.
If the buffer is too small, it raises CR_MALFORMED_PACKET_ERROR
and sets is_error to true.
Otherwise it sets is_error to false and calls @ref inet_field_length_ll.
@sa @ref net_field_length_ll
@param mysql the handle to return an error in
@param [in,out] packet pointer to the buffer to read the length from
@param packet_length remaining bytes in packet
@param [out] is_error set to true if the buffer contains no room for a
full length, false otherwise.
@return the size read.
*/
inline my_ulonglong net_field_length_ll_safe(MYSQL *mysql, uchar **packet,
ulong packet_length,
bool *is_error) {
size_t sizeof_len = net_field_length_size(*packet);
DBUG_EXECUTE_IF("simulate_bad_packet",
{ *packet = *packet + packet_length + 1000000L; });
if (!buffer_check_remaining(mysql, *packet, packet_length, sizeof_len)) {
*is_error = true;
return 0;
}
*is_error = false;
return net_field_length_ll(packet);
}
/**
Read Ok packet along with the server state change information.
*/
void read_ok_ex(MYSQL *mysql, ulong length) {
size_t total_len, len;
uchar *pos, *saved_pos;
my_ulonglong affected_rows, insert_id;
char *db;
char *data_str;
CHARSET_INFO *saved_cs;
bool is_charset;
STATE_INFO *info = nullptr;
LIST *element = nullptr;
LEX_STRING *data = nullptr;
bool is_error;
pos = mysql->net.read_pos + 1;
affected_rows = net_field_length_ll_safe(mysql, &pos, length,
&is_error); /* affected rows */
if (is_error) return;
insert_id =
net_field_length_ll_safe(mysql, &pos, length, &is_error); /* insert id */
if (is_error) return;
/*
The following check ensures that we skip the assignment for the
above read fields (i.e. affected_rows and insert_id) wherein the
EOF packets are deprecated and the server sends OK packet instead
with a packet header of 0xFE (254) to identify it as an EOF packet.
We ignore this assignment as the valid contents of EOF packet include
packet marker, server status and warning count only. However, we would
assign these values to the connection handle if it was an OK packet
with a packet header of 0x00.
*/
if (!((mysql->server_capabilities & CLIENT_DEPRECATE_EOF) &&
mysql->net.read_pos[0] == 254)) {
mysql->affected_rows = affected_rows;
mysql->insert_id = insert_id;
DBUG_PRINT("info", ("affected_rows: %lu insert_id: %lu",
(ulong)mysql->affected_rows, (ulong)mysql->insert_id));
}
if (!buffer_check_remaining(mysql, pos, length, 2)) return;
/* server status */
mysql->server_status = uint2korr(pos);
pos += 2;
if (protocol_41(mysql)) {
if (!buffer_check_remaining(mysql, pos, length, 2)) return;
mysql->warning_count = uint2korr(pos);
pos += 2;
} else
mysql->warning_count = 0; /* MySQL 4.0 protocol */
DBUG_PRINT("info", ("status: %u warning_count: %u", mysql->server_status,
mysql->warning_count));
if (mysql->server_capabilities & CLIENT_SESSION_TRACK) {
free_state_change_info(static_cast<MYSQL_EXTENSION *>(mysql->extension));
if (pos < mysql->net.read_pos + length) {
/* get the info field */
size_t length_msg_member =
(size_t)net_field_length_ll_safe(mysql, &pos, length, &is_error);
if (is_error) return;
if (!buffer_check_remaining(mysql, pos, length, length_msg_member))
return;
mysql->info = (length_msg_member ? (char *)pos : nullptr);
pos += (length_msg_member);
/* read session state changes info */
if (mysql->server_status & SERVER_SESSION_STATE_CHANGED) {
saved_pos = pos;
total_len =
(size_t)net_field_length_ll_safe(mysql, &pos, length, &is_error);
if (is_error) return;
/* ensure that mysql->info is zero-terminated */
if (mysql->info) *saved_pos = 0;
while (total_len > 0) {
saved_pos = pos;
my_ulonglong type =
net_field_length_ll_safe(mysql, &pos, length, &is_error);
if (is_error) return;
switch (type) {
case SESSION_TRACK_SYSTEM_VARIABLES:
/* Move past the total length of the changed entity. */
(void)net_field_length_ll_safe(mysql, &pos, length, &is_error);
if (is_error) return;
/* Name of the system variable. */
len = (size_t)net_field_length_ll_safe(mysql, &pos, length,
&is_error);
if (is_error) return;
if (!buffer_check_remaining(mysql, pos, length, len)) return;
if (!my_multi_malloc(key_memory_MYSQL_state_change_info, MYF(0),
&element, sizeof(LIST), &data,
sizeof(LEX_STRING), &data_str, len, NullS)) {
set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
return;
}
data->str = data_str;
memcpy(data->str, (char *)pos, len);
data->length = len;
pos += len;
element->data = data;
ADD_INFO(info, element, SESSION_TRACK_SYSTEM_VARIABLES);
/*
Check if the changed variable was charset. In that case we need
to update mysql->charset.
*/
if (!strncmp(data->str, "character_set_client", data->length))
is_charset = true;
else
is_charset = false;
/* Value of the system variable. */
len = (size_t)net_field_length_ll_safe(mysql, &pos, length,
&is_error);
if (is_error) return;
if (!buffer_check_remaining(mysql, pos, length, len)) return;
if (!my_multi_malloc(key_memory_MYSQL_state_change_info, MYF(0),
&element, sizeof(LIST), &data,
sizeof(LEX_STRING), &data_str, len, NullS)) {
set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
return;
}
data->str = data_str;
memcpy(data->str, (char *)pos, len);
data->length = len;
pos += len;
element->data = data;
ADD_INFO(info, element, SESSION_TRACK_SYSTEM_VARIABLES);
if (is_charset == 1) {
char charset_name[MY_CS_NAME_SIZE * 8]; // MY_CS_BUFFER_SIZE
size_t charset_name_length =
std::min(data->length, sizeof(charset_name) - 1);
saved_cs = mysql->charset;
memcpy(charset_name, data->str, charset_name_length);
charset_name[charset_name_length] = 0;
if (!(mysql->charset = get_charset_by_csname(
charset_name, MY_CS_PRIMARY, MYF(MY_WME)))) {
DBUG_PRINT(
"warning",
("session tracker supplied %s is not a valid charset."
" Keeping the old one.",
charset_name));
mysql->charset = saved_cs;
}
}
break;
case SESSION_TRACK_TRANSACTION_STATE:
case SESSION_TRACK_TRANSACTION_CHARACTERISTICS:
case SESSION_TRACK_SCHEMA:
/* Move past the total length of the changed entity. */
(void)net_field_length_ll_safe(mysql, &pos, length, &is_error);
if (is_error) return;
len = (size_t)net_field_length_ll_safe(mysql, &pos, length,
&is_error);
if (is_error) return;
if (!buffer_check_remaining(mysql, pos, length, len)) return;
if (!my_multi_malloc(key_memory_MYSQL_state_change_info, MYF(0),
&element, sizeof(LIST), &data,
sizeof(LEX_STRING), &data_str, len, NullS)) {
set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
return;
}
data->str = data_str;
memcpy(data->str, (char *)pos, len);
data->length = len;
pos += len;
element->data = data;
ADD_INFO(info, element, type);
if (type == SESSION_TRACK_SCHEMA) {
if (!(db = (char *)my_malloc(key_memory_MYSQL_state_change_info,
data->length + 1, MYF(MY_WME)))) {
set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
return;
}
if (mysql->db) my_free(mysql->db);
memcpy(db, data->str, data->length);
db[data->length] = '\0';
mysql->db = db;
}