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/*
** Zabbix
** Copyright (C) 2001-2019 Zabbix SIA
**
** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#include "common.h"
#include "nodecommand.h"
#include "comms.h"
#include "zbxserver.h"
#include "db.h"
#include "log.h"
#include "../scripts/scripts.h"
/******************************************************************************
* *
* Function: execute_remote_script *
* *
* Purpose: execute remote command and wait for the result *
* *
* Return value: SUCCEED - the remote command was executed successfully *
* FAIL - an error occurred *
* *
******************************************************************************/
static int execute_remote_script(zbx_script_t *script, DC_HOST *host, char **info, char *error,
size_t max_error_len)
{
int ret = FAIL, time_start;
zbx_uint64_t taskid;
DB_RESULT result = NULL;
DB_ROW row;
if (0 == (taskid = zbx_script_create_task(script, host, 0, time(NULL))))
{
zbx_snprintf(error, max_error_len, "Cannot create remote command task.");
return FAIL;
}
for (time_start = time(NULL); SEC_PER_MIN > time(NULL) - time_start; sleep(1))
{
result = DBselect(
"select tr.status,tr.info"
" from task t"
" left join task_remote_command_result tr"
" on tr.taskid=t.taskid"
" where tr.parent_taskid=" ZBX_FS_UI64,
taskid);
if (NULL != (row = DBfetch(result)))
{
if (SUCCEED == (ret = atoi(row[0])))
*info = zbx_strdup(*info, row[1]);
else
zbx_strlcpy(error, row[1], max_error_len);
DBfree_result(result);
return ret;
}
DBfree_result(result);
}
zbx_snprintf(error, max_error_len, "Timeout while waiting for remote command result.");
return FAIL;
}
/******************************************************************************
* *
* Function: execute_script *
* *
* Purpose: executing command *
* *
* Return value: SUCCEED - processed successfully *
* FAIL - an error occurred *
* *
******************************************************************************/
static int execute_script(zbx_uint64_t scriptid, zbx_uint64_t hostid, const char *sessionid, char **result)
{
char error[MAX_STRING_LEN];
int ret = FAIL, rc;
DC_HOST host;
zbx_script_t script;
zbx_user_t user;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() scriptid:" ZBX_FS_UI64 " hostid:" ZBX_FS_UI64 " sessionid:%s",
__func__, scriptid, hostid, sessionid);
*error = '\0';
if (SUCCEED != (rc = DCget_host_by_hostid(&host, hostid)))
{
zbx_strlcpy(error, "Unknown host identifier.", sizeof(error));
goto fail;
}
if (SUCCEED != (rc = DBget_user_by_active_session(sessionid, &user)))
{
zbx_strlcpy(error, "Permission denied.", sizeof(error));
goto fail;
}
zbx_script_init(&script);
script.type = ZBX_SCRIPT_TYPE_GLOBAL_SCRIPT;
script.scriptid = scriptid;
if (SUCCEED == (ret = zbx_script_prepare(&script, &host, &user, error, sizeof(error))))
{
if (0 == host.proxy_hostid || ZBX_SCRIPT_EXECUTE_ON_SERVER == script.execute_on)
ret = zbx_script_execute(&script, &host, result, error, sizeof(error));
else
ret = execute_remote_script(&script, &host, result, error, sizeof(error));
}
zbx_script_clean(&script);
fail:
if (SUCCEED != ret)
*result = zbx_strdup(*result, error);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __func__, zbx_result_string(ret));
return ret;
}
/******************************************************************************
* *
* Function: node_process_command *
* *
* Purpose: process command received from the frontend *
* *
* Return value: SUCCEED - processed successfully *
* FAIL - an error occurred *
* *
******************************************************************************/
int node_process_command(zbx_socket_t *sock, const char *data, struct zbx_json_parse *jp)
{
char *result = NULL, *send = NULL, tmp[64], sessionid[MAX_STRING_LEN];
int ret = FAIL;
zbx_uint64_t scriptid, hostid;
struct zbx_json j;
zabbix_log(LOG_LEVEL_DEBUG, "In node_process_command()");
zbx_json_init(&j, ZBX_JSON_STAT_BUF_LEN);
if (SUCCEED != zbx_json_value_by_name(jp, ZBX_PROTO_TAG_SCRIPTID, tmp, sizeof(tmp), NULL) ||
FAIL == is_uint64(tmp, &scriptid))
{
result = zbx_dsprintf(result, "Failed to parse command request tag: %s.", ZBX_PROTO_TAG_SCRIPTID);
goto finish;
}
if (SUCCEED != zbx_json_value_by_name(jp, ZBX_PROTO_TAG_HOSTID, tmp, sizeof(tmp), NULL) ||
FAIL == is_uint64(tmp, &hostid))
{
result = zbx_dsprintf(result, "Failed to parse command request tag: %s.", ZBX_PROTO_TAG_HOSTID);
goto finish;
}
if (SUCCEED != zbx_json_value_by_name(jp, ZBX_PROTO_TAG_SID, sessionid, sizeof(sessionid), NULL))
{
result = zbx_dsprintf(result, "Failed to parse command request tag: %s.", ZBX_PROTO_TAG_SID);
goto finish;
}
if (SUCCEED == (ret = execute_script(scriptid, hostid, sessionid, &result)))
{
zbx_json_addstring(&j, ZBX_PROTO_TAG_RESPONSE, ZBX_PROTO_VALUE_SUCCESS, ZBX_JSON_TYPE_STRING);
zbx_json_addstring(&j, ZBX_PROTO_TAG_DATA, result, ZBX_JSON_TYPE_STRING);
send = j.buffer;
}
finish:
if (SUCCEED != ret)
{
zbx_json_addstring(&j, ZBX_PROTO_TAG_RESPONSE, ZBX_PROTO_VALUE_FAILED, ZBX_JSON_TYPE_STRING);
zbx_json_addstring(&j, ZBX_PROTO_TAG_INFO, (NULL != result ? result : "Unknown error."),
ZBX_JSON_TYPE_STRING);
send = j.buffer;
}
zbx_alarm_on(CONFIG_TIMEOUT);
if (SUCCEED != zbx_tcp_send(sock, send))
zabbix_log(LOG_LEVEL_WARNING, "Error sending result of command");
else
zabbix_log(LOG_LEVEL_DEBUG, "Sending back command '%s' result '%s'", data, send);
zbx_alarm_off();
zbx_json_free(&j);
zbx_free(result);
return ret;
}
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