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/*
** Zabbix
** Copyright (C) 2001-2020 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 "checks_telnet.h"
#include "telnet.h"
#include "comms.h"
#include "log.h"
#define TELNET_RUN_KEY "telnet.run"
/*
* Example: telnet.run["ls /"]
*/
static int telnet_run(DC_ITEM *item, AGENT_RESULT *result, const char *encoding)
{
zbx_socket_t s;
int ret = NOTSUPPORTED, flags;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
if (FAIL == zbx_tcp_connect(&s, CONFIG_SOURCE_IP, item->interface.addr, item->interface.port, 0,
ZBX_TCP_SEC_UNENCRYPTED, NULL, NULL))
{
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Cannot connect to TELNET server: %s",
zbx_socket_strerror()));
goto close;
}
flags = fcntl(s.socket, F_GETFL);
if (0 == (flags & O_NONBLOCK))
fcntl(s.socket, F_SETFL, flags | O_NONBLOCK);
if (FAIL == telnet_login(s.socket, item->username, item->password, result))
goto tcp_close;
if (FAIL == telnet_execute(s.socket, item->params, result, encoding))
goto tcp_close;
ret = SUCCEED;
tcp_close:
zbx_tcp_close(&s);
close:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __func__, zbx_result_string(ret));
return ret;
}
int get_value_telnet(DC_ITEM *item, AGENT_RESULT *result)
{
AGENT_REQUEST request;
int ret = NOTSUPPORTED;
const char *port, *encoding, *dns;
init_request(&request);
if (SUCCEED != parse_item_key(item->key, &request))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid item key format."));
goto out;
}
if (0 != strcmp(TELNET_RUN_KEY, get_rkey(&request)))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Unsupported item key for this item type."));
goto out;
}
if (4 < get_rparams_num(&request))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
goto out;
}
if (NULL != (dns = get_rparam(&request, 1)) && '\0' != *dns)
{
strscpy(item->interface.dns_orig, dns);
item->interface.addr = item->interface.dns_orig;
}
if (NULL != (port = get_rparam(&request, 2)) && '\0' != *port)
{
if (FAIL == is_ushort(port, &item->interface.port))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid third parameter."));
goto out;
}
}
else
item->interface.port = ZBX_DEFAULT_TELNET_PORT;
encoding = get_rparam(&request, 3);
ret = telnet_run(item, result, ZBX_NULL2EMPTY_STR(encoding));
out:
free_request(&request);
return ret;
}
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