greenplumn auth_delay 源码
greenplumn auth_delay 代码
文件路径：/contrib/auth_delay/auth_delay.c
/* -------------------------------------------------------------------------
*
* auth_delay.c
*
* Copyright (c) 2010-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/auth_delay/auth_delay.c
*
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include <limits.h>
#include "libpq/auth.h"
#include "port.h"
#include "utils/guc.h"
#include "utils/timestamp.h"
PG_MODULE_MAGIC;
void _PG_init(void);
/* GUC Variables */
static int auth_delay_milliseconds;
/* Original Hook */
static ClientAuthentication_hook_type original_client_auth_hook = NULL;
/*
* Check authentication
*/
static void
auth_delay_checks(Port *port, int status)
{
/*
* Any other plugins which use ClientAuthentication_hook.
*/
if (original_client_auth_hook)
original_client_auth_hook(port, status);
/*
* Inject a short delay if authentication failed.
*/
if (status != STATUS_OK)
{
pg_usleep(1000L * auth_delay_milliseconds);
}
}
/*
* Module Load Callback
*/
void
_PG_init(void)
{
/* Define custom GUC variables */
DefineCustomIntVariable("auth_delay.milliseconds",
"Milliseconds to delay before reporting authentication failure",
NULL,
&auth_delay_milliseconds,
0,
0, INT_MAX / 1000,
PGC_SIGHUP,
GUC_UNIT_MS,
NULL,
NULL,
NULL);
/* Install Hooks */
original_client_auth_hook = ClientAuthentication_hook;
ClientAuthentication_hook = auth_delay_checks;
}
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