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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* plugins/kdb/ldap/libkdb_ldap/ldap_handle.c */
/*
* Copyright (c) 2004-2005, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "ldap_main.h"
#ifdef ASYNC_BIND
/*
* Update the server info structure. In case of an asynchronous bind,
* this function is called to check the bind status. A flag
* server_info_upate_pending is refered before calling this function.
* This function sets the server_status to either ON or OFF and
* sets the server_info_udpate_pending to OFF.
* Do not lock the mutex here. The caller should lock it
*/
static krb5_error_code
krb5_update_server_info(krb5_ldap_server_handle *ldap_server_handle,
krb5_ldap_server_info *server_info)
{
krb5_error_code st=0;
struct timeval ztime={0, 0};
LDAPMessage *result=NULL;
if (ldap_server_handle == NULL || server_info == NULL)
return -1;
while (st == 0) {
st = ldap_result(ldap_server_handle->ldap_handle, ldap_server_handle->msgid,
LDAP_MSG_ALL, &ztime, &result);
switch (st) {
case -1:
server_info->server_status = OFF;
time(&server_info->downtime);
break;
case 0:
continue;
break;
case LDAP_RES_BIND:
if ((st=ldap_result2error(ldap_server_handle->ldap_handle, result, 1)) == LDAP_SUCCESS) {
server_info->server_status = ON;
} else {
/* ?? */ krb5_set_error_message(0, 0, "%s", ldap_err2string(st));
server_info->server_status = OFF;
time(&server_info->downtime);
}
ldap_msgfree(result);
break;
default:
ldap_msgfree(result);
continue;
break;
}
}
ldap_server_handle->server_info_update_pending = FALSE;
return 0;
}
#endif
/*
* Return ldap server handle from the pool. If the pool is exhausted return NULL.
* Do not lock the mutex, caller should lock it
*/
static krb5_ldap_server_handle *
krb5_get_ldap_handle(krb5_ldap_context *ldap_context)
{
krb5_ldap_server_handle *ldap_server_handle=NULL;
krb5_ldap_server_info *ldap_server_info=NULL;
int cnt=0;
while (ldap_context->server_info_list[cnt] != NULL) {
ldap_server_info = ldap_context->server_info_list[cnt];
if (ldap_server_info->server_status != OFF) {
if (ldap_server_info->ldap_server_handles != NULL) {
ldap_server_handle = ldap_server_info->ldap_server_handles;
ldap_server_info->ldap_server_handles = ldap_server_handle->next;
break;
#ifdef ASYNC_BIND
if (ldap_server_handle->server_info_update_pending == TRUE) {
krb5_update_server_info(context, ldap_server_handle,
ldap_server_info);
}
if (ldap_server_info->server_status == ON) {
ldap_server_info->ldap_server_handles = ldap_server_handle->next;
break;
} else
ldap_server_handle = NULL;
#endif
}
}
++cnt;
}
return ldap_server_handle;
}
/*
* This is called incase krb5_get_ldap_handle returns NULL.
* Try getting a single connection (handle) and return the same by
* calling krb5_get_ldap_handle function.
* Do not lock the mutex here. The caller should lock it
*/
static krb5_ldap_server_handle *
krb5_retry_get_ldap_handle(krb5_ldap_context *ldap_context,
krb5_error_code *st)
{
krb5_ldap_server_handle *ldap_server_handle=NULL;
if ((*st=krb5_ldap_db_single_init(ldap_context)) != 0)
return NULL;
ldap_server_handle = krb5_get_ldap_handle(ldap_context);
return ldap_server_handle;
}
/*
* Put back the ldap server handle to the front of the list of handles of the
* ldap server info structure.
* Do not lock the mutex here. The caller should lock it.
*/
static krb5_error_code
krb5_put_ldap_handle(krb5_ldap_server_handle *ldap_server_handle)
{
if (ldap_server_handle == NULL)
return 0;
ldap_server_handle->next = ldap_server_handle->server_info->ldap_server_handles;
ldap_server_handle->server_info->ldap_server_handles = ldap_server_handle;
return 0;
}
/*
* Add a new ldap server handle structure to the server info structure.
* This function name can be changed to krb5_insert_ldap_handle.
* Do not lock the mutex here. The caller should lock it
*/
krb5_error_code
krb5_update_ldap_handle(krb5_ldap_server_handle *ldap_server_handle,
krb5_ldap_server_info *server_info)
{
if (ldap_server_handle == NULL || server_info == NULL)
return 0;
ldap_server_handle->next = server_info->ldap_server_handles;
server_info->ldap_server_handles = ldap_server_handle;
server_info->num_conns++;
ldap_server_handle->server_info = server_info;
return 0;
}
/*
* Free up all the ldap server handles of the server info.
* This function is called when the ldap server returns LDAP_SERVER_DOWN.
*/
static krb5_error_code
krb5_ldap_cleanup_handles(krb5_ldap_server_info *ldap_server_info)
{
krb5_ldap_server_handle *ldap_server_handle = NULL;
while (ldap_server_info->ldap_server_handles != NULL) {
ldap_server_handle = ldap_server_info->ldap_server_handles;
ldap_server_info->ldap_server_handles = ldap_server_handle->next;
/* ldap_unbind_s(ldap_server_handle); */
free (ldap_server_handle);
ldap_server_handle = NULL;
}
return 0;
}
/*
* wrapper function called from outside to get a handle.
*/
krb5_error_code
krb5_ldap_request_handle_from_pool(krb5_ldap_context *ldap_context,
krb5_ldap_server_handle **
ldap_server_handle)
{
krb5_error_code st=0;
*ldap_server_handle = NULL;
HNDL_LOCK(ldap_context);
if (((*ldap_server_handle)=krb5_get_ldap_handle(ldap_context)) == NULL)
(*ldap_server_handle)=krb5_retry_get_ldap_handle(ldap_context, &st);
HNDL_UNLOCK(ldap_context);
return st;
}
/*
* wrapper function wrapper called to get the next ldap server handle, when the current
* ldap server handle returns LDAP_SERVER_DOWN.
*/
krb5_error_code
krb5_ldap_request_next_handle_from_pool(krb5_ldap_context *ldap_context,
krb5_ldap_server_handle **
ldap_server_handle)
{
krb5_error_code st=0;
HNDL_LOCK(ldap_context);
(*ldap_server_handle)->server_info->server_status = OFF;
time(&(*ldap_server_handle)->server_info->downtime);
krb5_put_ldap_handle(*ldap_server_handle);
krb5_ldap_cleanup_handles((*ldap_server_handle)->server_info);
if (((*ldap_server_handle)=krb5_get_ldap_handle(ldap_context)) == NULL)
(*ldap_server_handle)=krb5_retry_get_ldap_handle(ldap_context, &st);
HNDL_UNLOCK(ldap_context);
return st;
}
/*
* wrapper function to call krb5_put_ldap_handle.
*/
void
krb5_ldap_put_handle_to_pool(krb5_ldap_context *ldap_context,
krb5_ldap_server_handle *ldap_server_handle)
{
if (ldap_server_handle != NULL) {
HNDL_LOCK(ldap_context);
krb5_put_ldap_handle(ldap_server_handle);
HNDL_UNLOCK(ldap_context);
}
return;
}
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