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/** @file
Parser MySQL driver.
Copyright (c) 2001-2015 Art. Lebedev Studio (http://www.artlebedev.com)
Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
2001-07-30 using MySQL 3.23.22b
2001-11-06 numrows on "HP-UX istok1 B.11.00 A 9000/869 448594332 two-user license"
3.23.42 & 4.0.0.alfa never worked, both subst & .sl version returned 0
*/
#include "config_includes.h"
#include "pa_sql_driver.h"
volatile const char * IDENT_PARSER3MYSQL_C="$Id: parser3mysql.C,v 1.48 2015/10/26 16:00:50 moko Exp $" IDENT_PA_SQL_DRIVER_H;
#define NO_CLIENT_LONG_LONG
#include <mysql.h>
#include <server/private/custom_conf.h>
#include "ltdl.h"
#define MAX_STRING 0x400
#define MAX_NUMBER 20
#if _MSC_VER
# define snprintf _snprintf
# define strcasecmp _stricmp
#endif
// for mysql < 4.1
#if !defined(CLIENT_MULTI_RESULTS) || !defined(CLIENT_MULTI_STATEMENTS)
# define OLD_MYSQL_CLIENT 1
#endif
#ifndef CLIENT_MULTI_RESULTS
# define CLIENT_MULTI_RESULTS (1UL << 17)
#endif
#ifndef CLIENT_MULTI_STATEMENTS
# define CLIENT_MULTI_STATEMENTS (1UL << 16)
#endif
static char *lsplit(char *string, char delim){
if(string) {
if(char *v=strchr(string, delim)){
*v=0;
return v+1;
}
}
return 0;
}
static char *lsplit(char **string_ref, char delim){
char *result=*string_ref;
char *next=lsplit(*string_ref, delim);
*string_ref=next;
return result;
}
static char* rsplit(char* string, char delim){
if(string){
if(char* v=strrchr(string, delim)){
*v=0;
return v+1;
}
}
return NULL;
}
static void toupper_str(char *out, const char *in, size_t size){
while(size--)
*out++=(char)toupper(*in++);
}
inline static bool is_column_transcode_required(enum_field_types type) {
switch(type) {
case MYSQL_TYPE_NULL:
#ifdef FIELD_TYPE_NEWDECIMAL
case MYSQL_TYPE_NEWDECIMAL:
#endif
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
case MYSQL_TYPE_INT24:
#ifdef FIELD_TYPE_BIT
case MYSQL_TYPE_BIT:
#endif
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_NEWDATE:
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_YEAR:
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
return false;
break;
}
return true;
}
inline static const char* strdup(SQL_Driver_services& services, char* str, size_t length) {
char *strm=(char*)services.malloc_atomic(length+1);
memcpy(strm, str, length);
strm[length]=0;
return (const char*)strm;
}
struct Connection {
SQL_Driver_services* services;
MYSQL* handle;
const char* client_charset;
bool autocommit;
};
/**
MySQL server driver
*/
class MySQL_Driver : public SQL_Driver {
public:
MySQL_Driver() : SQL_Driver() {}
/// get api version
int api_version() { return SQL_DRIVER_API_VERSION; }
/// initialize driver by loading sql dynamic link library
const char *initialize(char *dlopen_file_spec) {
return dlopen_file_spec?
dlink(dlopen_file_spec):"client library column is empty";
}
/** connect
@param url
format: @b user:pass@host[:port]|[/unix/socket]/database?
charset=value& // transcode by server with command 'SET NAMES value'
ClientCharset=charset& // transcode by parser
timeout=3&
compress=0&
named_pipe=1&
autocommit=1&
multi_statements=0 // allows more then one statement in one query
old_client=1 // simulates 3.xx client. not compatible with multi_statements option
3.x, 4.0
only option for charset is cp1251_koi8.
4.1+ accept not 'cp1251_koi8' but 'cp1251', 'utf8' and much more
it is usable for transcoding using sql server
*/
void connect(
char *url,
SQL_Driver_services& services,
void **connection_ref ///< output: Connection*
){
char *user=url;
char *s=rsplit(user, '@');
char *host=0;
char *unix_socket=0;
if(s && s[0]=='[') { // unix socket
unix_socket=1+s;
s=lsplit(unix_socket, ']');
} else { // IP
host=s;
}
char *db=lsplit(s, '/');
char *pwd=lsplit(user, ':');
char *error_pos=0;
char *port_cstr=lsplit(host, ':');
int port=port_cstr?strtol(port_cstr, &error_pos, 0):0;
char *options=lsplit(db, '?');
char *charset=0;
#ifdef OLD_MYSQL_CLIENT
int client_flag=0;
#else
int client_flag=CLIENT_MULTI_RESULTS;
#endif
Connection& connection=*(Connection *)services.malloc(sizeof(Connection));
*connection_ref=&connection;
connection.services=&services;
connection.handle=mysql_init(NULL);
connection.client_charset=0;
connection.autocommit=true;
while(options){
if(char *key=lsplit(&options, '&')){
if(*key){
if(char *value=lsplit(key, '=')){
if(strcmp(key, "ClientCharset")==0){ // transcoding with parser
toupper_str(value, value, strlen(value));
connection.client_charset=value;
} else if(strcasecmp(key, "charset")==0){ // transcoding with server
charset=value;
} else if(strcasecmp(key, "timeout")==0){
unsigned int timeout=(unsigned int)atoi(value);
if(mysql_options(connection.handle, MYSQL_OPT_CONNECT_TIMEOUT, (const char *)&timeout)!=0)
services._throw(mysql_error(connection.handle));
} else if(strcasecmp(key, "compress")==0){
if(atoi(value))
if(mysql_options(connection.handle, MYSQL_OPT_COMPRESS, 0)!=0)
services._throw(mysql_error(connection.handle));
} else if(strcasecmp(key, "named_pipe")==0){
if(atoi(value))
if(mysql_options(connection.handle, MYSQL_OPT_NAMED_PIPE, 0)!=0)
services._throw(mysql_error(connection.handle));
} else if(strcasecmp(key, "local_infile")==0){
if(atoi(value))
if(mysql_options(connection.handle, MYSQL_OPT_LOCAL_INFILE, 0)!=0)
services._throw(mysql_error(connection.handle));
} else if(strcasecmp(key, "autocommit")==0){
if(atoi(value)==0)
connection.autocommit=false;
} else if(strcasecmp(key, "multi_statements")==0){
#ifdef OLD_MYSQL_CLIENT
services._throw("driver was built with old mysql includes so multi_statements option can't be used");
#else
if(!(client_flag==CLIENT_MULTI_RESULTS || client_flag==CLIENT_MULTI_STATEMENTS))
services._throw("you can't specify together options old_client and multi_statements");
if(atoi(value)!=0)
client_flag=CLIENT_MULTI_STATEMENTS;
#endif
} else if(strcasecmp(key, "old_client")==0){
#ifdef OLD_MYSQL_CLIENT
services._throw("driver was built with old mysql includes so old_client option can't be used");
#else
if(!(client_flag==CLIENT_MULTI_RESULTS || client_flag==0))
services._throw("you can't specify together options old_client and multi_statements");
if(atoi(value)!=0)
client_flag=0;
#endif
} else
services._throw("unknown connect option" /*key*/);
} else
services._throw("connect option without =value" /*key*/);
}
}
}
if(!mysql_real_connect(
connection.handle,
host, user, pwd, db,
port?port:MYSQL_PORT,
unix_socket,
client_flag
)
){
services._throw(mysql_error(connection.handle));
}
if(charset){
char statement[MAX_STRING+1]="SET NAMES ";
strncat(statement, charset, MAX_STRING);
_exec(connection, statement);
}
if(!connection.autocommit)
_exec(connection, "SET AUTOCOMMIT=0");
}
void disconnect(void *aconnection) {
Connection& connection=*static_cast<Connection*>(aconnection);
mysql_close(connection.handle);
connection.handle=0;
}
void commit(void *aconnection) {
Connection& connection=*static_cast<Connection*>(aconnection);
if(!connection.autocommit)
_exec(connection, "COMMIT");
}
void rollback(void *aconnection) {
Connection& connection=*static_cast<Connection*>(aconnection);
if(!connection.autocommit)
_exec(connection, "ROLLBACK");
}
bool ping(void *aconnection) {
Connection& connection=*static_cast<Connection*>(aconnection);
return mysql_ping(connection.handle)==0;
}
// charset here is services.request_charset(), not connection.client_charset
// thus we can't use the sql server quoting support
const char* quote(void *aconnection, const char *str, unsigned int length) {
const char* from;
const char* from_end=str+length;
size_t quoted=0;
for(from=str; from<from_end; from++){
switch (*from) {
case 0:
case '\n':
case '\r':
case '\032':
case '\\':
case '\'':
case '"':
quoted++;
}
}
if(!quoted)
return str;
Connection& connection=*static_cast<Connection*>(aconnection);
char *result=(char*)connection.services->malloc_atomic(length + quoted + 1);
char *to = result;
for(from=str; from<from_end; from++){
char escape;
switch (*from) {
case 0:
escape= '0';
break;
case '\n':
escape= 'n';
break;
case '\r':
escape= 'r';
break;
case '\032':
escape= 'Z';
break;
case '\\':
case '\'':
case '"':
escape= *from;
break;
default:
*to++=*from;
continue;
}
*to++= '\\';
*to++= escape;
}
*to=0;
return result;
}
void query(void *aconnection,
const char *astatement,
size_t placeholders_count, Placeholder* placeholders,
unsigned long offset, unsigned long limit,
SQL_Driver_query_event_handlers& handlers
){
Connection& connection=*static_cast<Connection*>(aconnection);
SQL_Driver_services& services=*connection.services;
MYSQL_RES *res=NULL;
if(placeholders_count>0)
services._throw("bind variables not supported (yet)");
bool transcode_needed=_transcode_required(connection);
size_t statement_size=0;
if(transcode_needed) {
statement_size=strlen(astatement);
// transcode query from $request:charset to ?ClientCharset
services.transcode(astatement, statement_size,
astatement, statement_size,
services.request_charset(),
connection.client_charset);
}
const char *statement;
if(offset || limit!=SQL_NO_LIMIT) {
if(!statement_size)
statement_size=strlen(astatement);
char *statement_limited=(char *)services.malloc_atomic(
statement_size+MAX_NUMBER*2+8/* LIMIT #,#*/+1);
char *cur=statement_limited;
memcpy(cur, astatement, statement_size); cur+=statement_size;
cur+=sprintf(cur, " LIMIT ");
if(offset)
cur+=snprintf(cur, MAX_NUMBER, "%lu,", offset);
if(limit!=SQL_NO_LIMIT)
cur+=snprintf(cur, MAX_NUMBER, "%lu", limit);
statement=statement_limited;
} else
statement=astatement;
if(mysql_query(connection.handle, statement))
_throw(connection, mysql_error(connection.handle));
if(!(res=mysql_store_result(connection.handle)) && mysql_field_count(connection.handle))
_throw(connection, mysql_error(connection.handle));
if(!res) // empty result: insert|delete|update|...
return;
size_t column_count=mysql_num_fields(res);
if(!column_count) // old client
column_count=mysql_field_count(connection.handle);
if(!column_count){
mysql_free_result(res);
services._throw("result contains no columns");
}
bool failed=false;
SQL_Error sql_error;
#define CHECK(afailed) \
if(afailed) { \
failed=true; \
goto cleanup; \
}
#define DO_FETCH_FIELDS(transcode_column_name) { \
for(size_t i=0; i<column_count; i++) { \
if(MYSQL_FIELD *field = mysql_fetch_field(res)){ \
size_t length=field->name_length; \
const char* str=strdup(services, field->name, length); \
transcode_column_name \
CHECK(handlers.add_column(sql_error, str, length)); \
} else { \
/* seen broken client, that reported "44" column count for "select 2+2" */ \
column_count=i; \
break; \
} \
} \
}
#define DO_FETCH_ROWS(transcode_cell_value) { \
while(MYSQL_ROW mysql_row=mysql_fetch_row(res)) { \
CHECK(handlers.add_row(sql_error)); \
unsigned long *lengths=mysql_fetch_lengths(res); \
for(size_t i=0; i<column_count; i++) { \
const char* str=0; \
size_t length=lengths[i]; \
if(length) { \
str=strdup(services, mysql_row[i], length); \
transcode_cell_value \
} \
CHECK(handlers.add_row_cell(sql_error, str, length)); \
} \
} \
}
bool* transcode_column=0;
if(transcode_needed) {
transcode_column = new bool[column_count];
DO_FETCH_FIELDS(
transcode_column[i] = is_column_transcode_required(field->type);
// transcode column's name from ?ClientCharset to $request:charset
services.transcode(str, length,
str, length,
connection.client_charset,
services.request_charset());
)
CHECK(handlers.before_rows(sql_error));
DO_FETCH_ROWS(
if(transcode_column[i])
// transcode cell's value from ?ClientCharset to $request:charset
services.transcode(str, length,
str, length,
connection.client_charset,
services.request_charset());
)
} else {
// without transcoding
DO_FETCH_FIELDS()
CHECK(handlers.before_rows(sql_error));
DO_FETCH_ROWS()
}
cleanup:
if(transcode_column)
delete transcode_column;
mysql_free_result(res);
if(failed)
services._throw(sql_error);
}
private:
void _exec(Connection& connection, const char* statement) {
if(mysql_query(connection.handle, statement))
_throw(connection, mysql_error(connection.handle));
(*mysql_store_result)(connection.handle); // throw out the result [don't need but must call]
}
void _throw(Connection& connection, const char* aerr_msg) {
size_t length=strlen(aerr_msg);
if(length && _transcode_required(connection)) {
connection.services->transcode(aerr_msg, length,
aerr_msg, length,
connection.client_charset,
connection.services->request_charset());
}
connection.services->_throw(aerr_msg);
}
bool _transcode_required(Connection& connection){
return (connection.client_charset && strcmp(connection.client_charset, connection.services->request_charset())!=0);
}
private: // mysql client library funcs
typedef MYSQL* (STDCALL *t_mysql_init)(MYSQL *); t_mysql_init mysql_init;
typedef void (STDCALL *t_mysql_server_end)(); t_mysql_server_end mysql_server_end;
typedef int (STDCALL *t_mysql_options)(MYSQL *mysql, enum mysql_option option, const char *arg); t_mysql_options mysql_options;
typedef MYSQL_RES* (STDCALL *t_mysql_store_result)(MYSQL *); t_mysql_store_result mysql_store_result;
typedef int (STDCALL *t_mysql_query)(MYSQL *, const char *q); t_mysql_query mysql_query;
typedef char* (STDCALL *t_mysql_error)(MYSQL *); t_mysql_error mysql_error;
static char* STDCALL subst_mysql_error(MYSQL *mysql) { return (mysql)->net.last_error; }
typedef MYSQL* (STDCALL *t_mysql_real_connect)(MYSQL *, const char *host,
const char *user,
const char *passwd,
const char *db,
unsigned int port,
const char *unix_socket,
unsigned int clientflag); t_mysql_real_connect mysql_real_connect;
typedef void (STDCALL *t_mysql_close)(MYSQL *); t_mysql_close mysql_close;
typedef int (STDCALL *t_mysql_ping)(MYSQL *); t_mysql_ping mysql_ping;
typedef unsigned long (STDCALL *t_mysql_escape_string)(char *to,const char *from,
unsigned long from_length); t_mysql_escape_string mysql_escape_string;
typedef void (STDCALL *t_mysql_free_result)(MYSQL_RES *result); t_mysql_free_result mysql_free_result;
typedef unsigned long* (STDCALL *t_mysql_fetch_lengths)(MYSQL_RES *result); t_mysql_fetch_lengths mysql_fetch_lengths;
typedef MYSQL_ROW (STDCALL *t_mysql_fetch_row)(MYSQL_RES *result); t_mysql_fetch_row mysql_fetch_row;
typedef MYSQL_FIELD* (STDCALL *t_mysql_fetch_field)(MYSQL_RES *result); t_mysql_fetch_field mysql_fetch_field;
typedef unsigned int (STDCALL *t_mysql_num_fields)(MYSQL_RES *); t_mysql_num_fields mysql_num_fields;
typedef unsigned int (STDCALL *t_mysql_field_count)(MYSQL *); t_mysql_field_count mysql_field_count;
static unsigned int STDCALL subst_mysql_num_fields(MYSQL_RES *res) { return res->field_count; }
static unsigned int STDCALL subst_mysql_field_count(MYSQL *mysql) { return mysql->field_count; }
private: // mysql client library funcs linking
const char *dlink(const char *dlopen_file_spec) {
if(lt_dlinit()){
if(const char* result=lt_dlerror())
return result;
return "can not prepare to dynamic loading";
}
lt_dlhandle handle=lt_dlopen(dlopen_file_spec);
if(!handle){
if(const char* result=lt_dlerror())
return result;
return "can not open the dynamic link module";
}
#define GLINK(name) \
name=(t_##name)lt_dlsym(handle, #name);
#define DSLINK(name, action) \
GLINK(name) \
if(!name) \
action;
#define DLINK(name) DSLINK(name, return "function " #name " was not found")
#define SLINK(name) DSLINK(name, name=subst_##name)
DLINK(mysql_init);
GLINK(mysql_server_end);
DLINK(mysql_options);
DLINK(mysql_store_result);
DLINK(mysql_query);
SLINK(mysql_error);
DLINK(mysql_real_connect);
DLINK(mysql_close);
DLINK(mysql_ping);
DLINK(mysql_escape_string);
DLINK(mysql_free_result);
DLINK(mysql_fetch_lengths);
DLINK(mysql_fetch_row);
DLINK(mysql_fetch_field);
SLINK(mysql_num_fields);
SLINK(mysql_field_count);
return 0;
}
};
extern "C" SQL_Driver *SQL_DRIVER_CREATE() {
static MySQL_Driver Driver;
return &Driver;
}
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