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/*
Copyright (C) 1999-2003 IC & S dbmail@ic-s.nl
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; either
version 2 of the License, or (at your option) any later
version.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
*
* mysql driver file.
* functions for connecting and talking to the Mysql database
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "db.h"
#include "mysql.h"
#include "dbmail.h"
#include "dbmailtypes.h"
#include <string.h>
#define DB_MYSQL_STANDARD_PORT 3306
static MYSQL conn; /**< MySQL database connection */
static MYSQL_RES *res = NULL; /**< MySQL result set */
static MYSQL_RES *msgbuf_res = NULL; /**< MySQL result set for msgbuf */
static MYSQL_RES *auth_res = NULL; /**< MySQL result set for authentication */
static MYSQL_RES *stored_res = NULL; /**< MySQL result set backup */
static unsigned last_row_nr = -1; /**< number of last row that was used */
static MYSQL_ROW last_row; /**< last result set */
/** database parameters */
db_param_t _db_params;
/* static functions, only used locally */
/**
* \brief check database connection. If it is dead, reconnect
* \return
* - -1 on failure (no connection to db possible)
* - 0 on success
*/
static int db_check_connection(void);
int db_connect()
{
char *sock = NULL;
/* connect */
mysql_init(&conn);
/* auto re-connect */
conn.reconnect = 1;
/* use the standard MySQL port by default */
if (_db_params.port == 0)
_db_params.port = DB_MYSQL_STANDARD_PORT;
/* issue an error if a connection to a MySQL instance
* on the localhost is requested, but no sqlsocket is given */
if (strncmp(_db_params.host, "localhost", FIELDSIZE) == 0 ||
_db_params.host == NULL) {
if (strlen(_db_params.sock) == 0) {
trace(TRACE_WARNING, "%s,%s: MySQL host is set to "
"localhost, but no mysql_socket has been set. "
"Use sqlsocket=... in dbmail.conf. Connecting "
"will be attempted using the default socket.",
__FILE__, __FUNCTION__);
sock = NULL;
} else
sock = _db_params.sock;
}
if (mysql_real_connect (&conn, _db_params.host, _db_params.user,
_db_params.pass, _db_params.db,
_db_params.port, sock,
0) == NULL) {
trace(TRACE_ERROR,"%s,%s: mysql_real_connect failed: %s",
__FILE__, __FUNCTION__, mysql_error(&conn));
return -1;
}
#ifdef mysql_errno
if (mysql_errno(&conn)) {
trace(TRACE_ERROR,"%s,%s: mysql_real_connect failed: %s",
__FILE__, __FUNCTION__, mysql_error(&conn));
return -1;
}
#endif
return 0;
}
unsigned db_num_rows()
{
/* mysql_store_result can return NULL. If this is
* true, res will be zero, and naturally num_rows
* should return 0 */
if (!res)
return 0;
return mysql_num_rows(res);
}
unsigned db_num_fields()
{
if (!res)
return 0;
return mysql_num_fields(res);
}
void db_free_result()
{
if (res)
mysql_free_result(res);
res = NULL;
}
char *db_get_result(unsigned row, unsigned field)
{
char *result;
if (!res) {
trace(TRACE_WARNING, "%s,%s: result set is null\n",
__FILE__, __FUNCTION__);
return NULL;
}
if ((row >= db_num_rows()) ||
(field >= db_num_fields())) {
trace(TRACE_WARNING, "%s, %s: "
"row = %u, field = %u, bigger than size of result set", __FILE__, __FUNCTION__,row, field);
return NULL;
}
/* get the right row */
if(last_row_nr == row) {
} else if((last_row_nr + 1) == row) {
last_row = mysql_fetch_row(res);
} else {
mysql_data_seek(res, row);
last_row = mysql_fetch_row(res);
}
result = last_row[field];
if (result == NULL)
trace(TRACE_WARNING, "%s,%s: result is null\n",
__FILE__, __FUNCTION__);
last_row_nr = row;
return result;
}
int db_disconnect()
{
db_free_result();
mysql_close(&conn);
return 0;
}
int db_check_connection()
{
if (mysql_ping(&conn) != 0) {
trace(TRACE_DEBUG, "%s,%s: no database connection, trying "
"to establish on.", __FILE__, __FUNCTION__);
if (db_connect() < 0) {
trace(TRACE_ERROR, "%s,%s: unable to connect to "
"database.", __FILE__, __FUNCTION__);
return -1;
}
}
return 0;
}
u64_t db_insert_result(const char *sequence_identifier UNUSED)
{
u64_t insert_result;
insert_result = mysql_insert_id(&conn);
return insert_result;
}
int db_query(const char *the_query)
{
unsigned int querysize = 0;
last_row_nr = -1;
if (db_check_connection() < 0) {
trace(TRACE_ERROR, "%s,%s: no database connection",
__FILE__, __FUNCTION__);
return -1;
}
if (the_query != NULL) {
querysize = strlen(the_query);
if (querysize > 0) {
trace(TRACE_DEBUG, "%s,%s: "
"executing query [%s]",
__FILE__, __FUNCTION__, the_query);
if (mysql_real_query(&conn,
the_query, querysize) < 0) {
trace(TRACE_ERROR, "%s,%s: "
"query [%s] failed",
__FILE__, __FUNCTION__, the_query);
trace(TRACE_ERROR, "%s,%s: "
"mysql_real_query failed: %s",
__FILE__, __FUNCTION__, mysql_error(&conn));
return -1;
}
} else {
trace(TRACE_ERROR, "%s,%s: "
"querysize is wrong: [%d]", __FILE__, __FUNCTION__,querysize);
return -1;
}
} else {
trace (TRACE_ERROR,"%s,%s: "
"query buffer is NULL, this is not supposed to happen\n",
__FILE__, __FUNCTION__);
return -1;
}
/* mysql_store_result is only needed if a SELECT or
an OPTIMIZE is done */
if (strncasecmp(the_query, "SELECT", 6) == 0 ||
strncasecmp(the_query, "OPTIMIZE", 8) == 0) {
res = mysql_store_result(&conn);
if (res == NULL) {
trace(TRACE_ERROR, "%s,%s: could not store query result",
__FILE__, __FUNCTION__);
return -1;
}
}
return 0;
}
unsigned long db_escape_string(char *to,
const char *from, unsigned long length)
{
return mysql_real_escape_string(&conn, to, from, length);
}
int db_do_cleanup(const char **tables, int num)
{
char query[DEF_QUERYSIZE];
int i;
int result = 0;
for (i = 0; i < num; i++) {
snprintf(query, DEF_QUERYSIZE, "OPTIMIZE TABLE %s", tables[i]);
if (db_query(query) == -1) {
trace(TRACE_ERROR, "%s,%s: error optimizing table [%s]",
__FILE__, __FUNCTION__, tables[i]);
result = -1;
}
db_free_result();
}
return result;
}
u64_t db_get_length(unsigned row, unsigned field)
{
if (!res) {
trace(TRACE_WARNING, "%s,%s: result set is null\n",
__FILE__, __FUNCTION__);
return -1;
}
if ((row >= db_num_rows()) ||
(field >= db_num_fields())) {
trace(TRACE_ERROR, "%s, %s: "
"row = %u, field = %u, bigger than size of result set", __FILE__, __FUNCTION__,row, field);
return -1;
}
/* get the right row */
if (last_row_nr == row) {
// Don't do anything, we're already there
} else if(last_row_nr + 1 == row) {
// Get the next row
last_row = mysql_fetch_row(res);
} else {
mysql_data_seek(res, row);
last_row = mysql_fetch_row(res);
}
last_row_nr = row;
return (u64_t) mysql_fetch_lengths(res)[field];
}
u64_t db_get_affected_rows()
{
return (u64_t) mysql_affected_rows(&conn);
}
void db_use_msgbuf_result()
{
stored_res = res;
res = msgbuf_res;
}
void db_store_msgbuf_result()
{
msgbuf_res = res;
res = stored_res;
}
void db_use_auth_result()
{
stored_res = res;
res = auth_res;
}
void db_store_auth_result()
{
auth_res = res;
res = stored_res;
}
void* db_get_result_set()
{
return (void*) res;
}
void db_set_result_set(void *the_result_set)
{
res = (MYSQL_RES*) the_result_set;
}
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