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/*
** Zabbix
** Copyright (C) 2001-2018 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 "sysinfo.h"
#include "comms.h"
#include "log.h"
#include "cfg.h"
#include "telnet.h"
#include "../common/net.h"
#include "ntp.h"
#include "simple.h"
#ifdef HAVE_LDAP
# include <ldap.h>
#endif
#ifdef HAVE_LBER_H
# include <lber.h>
#endif
ZBX_METRIC parameters_simple[] =
/* KEY FLAG FUNCTION TEST PARAMETERS */
{
{"net.tcp.service", CF_HAVEPARAMS, CHECK_SERVICE, "ssh,127.0.0.1,22"},
{"net.tcp.service.perf",CF_HAVEPARAMS, CHECK_SERVICE_PERF, "ssh,127.0.0.1,22"},
{"net.udp.service", CF_HAVEPARAMS, CHECK_SERVICE, "ntp,127.0.0.1,123"},
{"net.udp.service.perf",CF_HAVEPARAMS, CHECK_SERVICE_PERF, "ntp,127.0.0.1,123"},
{NULL}
};
#ifdef HAVE_LDAP
static int check_ldap(const char *host, unsigned short port, int timeout, int *value_int)
{
LDAP *ldap = NULL;
LDAPMessage *res = NULL;
LDAPMessage *msg = NULL;
BerElement *ber = NULL;
char *attrs[2] = {"namingContexts", NULL };
char *attr = NULL;
char **valRes = NULL;
int ldapErr = 0;
zbx_alarm_on(timeout);
*value_int = 0;
if (NULL == (ldap = ldap_init(host, port)))
{
zabbix_log(LOG_LEVEL_DEBUG, "LDAP - initialization failed [%s:%hu]", host, port);
goto lbl_ret;
}
if (LDAP_SUCCESS != (ldapErr = ldap_search_s(ldap, "", LDAP_SCOPE_BASE, "(objectClass=*)", attrs, 0, &res)))
{
zabbix_log(LOG_LEVEL_DEBUG, "LDAP - searching failed [%s] [%s]", host, ldap_err2string(ldapErr));
goto lbl_ret;
}
if (NULL == (msg = ldap_first_entry(ldap, res)))
{
zabbix_log(LOG_LEVEL_DEBUG, "LDAP - empty sort result. [%s] [%s]", host, ldap_err2string(ldapErr));
goto lbl_ret;
}
if (NULL == (attr = ldap_first_attribute(ldap, msg, &ber)))
{
zabbix_log(LOG_LEVEL_DEBUG, "LDAP - empty first entry result. [%s] [%s]", host, ldap_err2string(ldapErr));
goto lbl_ret;
}
valRes = ldap_get_values(ldap, msg, attr);
*value_int = 1;
lbl_ret:
zbx_alarm_off();
if (NULL != valRes)
ldap_value_free(valRes);
if (NULL != attr)
ldap_memfree(attr);
if (NULL != ber)
ber_free(ber, 0);
if (NULL != res)
ldap_msgfree(res);
if (NULL != ldap)
ldap_unbind(ldap);
return SYSINFO_RET_OK;
}
#endif /* HAVE_LDAP */
static int check_ssh(const char *host, unsigned short port, int timeout, int *value_int)
{
int ret, major, minor;
zbx_socket_t s;
char send_buf[MAX_STRING_LEN];
const char *buf;
*value_int = 0;
if (SUCCEED == (ret = zbx_tcp_connect(&s, CONFIG_SOURCE_IP, host, port, timeout, ZBX_TCP_SEC_UNENCRYPTED, NULL,
NULL)))
{
while (NULL != (buf = zbx_tcp_recv_line(&s)))
{
/* parse buf for SSH identification string as per RFC 4253, section 4.2 */
if (2 == sscanf(buf, "SSH-%d.%d-%*s", &major, &minor))
{
zbx_snprintf(send_buf, sizeof(send_buf), "SSH-%d.%d-zabbix_agent\r\n", major, minor);
*value_int = 1;
break;
}
}
if (0 == *value_int)
strscpy(send_buf, "0\n");
ret = zbx_tcp_send_raw(&s, send_buf);
zbx_tcp_close(&s);
}
if (FAIL == ret)
zabbix_log(LOG_LEVEL_DEBUG, "SSH check error: %s", zbx_socket_strerror());
return SYSINFO_RET_OK;
}
#ifdef HAVE_LIBCURL
static int check_https(const char *host, unsigned short port, int timeout, int *value_int)
{
const char *__function_name = "check_https";
CURL *easyhandle;
CURLoption opt;
CURLcode err;
char https_host[MAX_STRING_LEN];
*value_int = 0;
if (NULL == (easyhandle = curl_easy_init()))
{
zabbix_log(LOG_LEVEL_DEBUG, "%s: could not init cURL library", __function_name);
goto clean;
}
if (SUCCEED == is_ip6(host))
zbx_snprintf(https_host, sizeof(https_host), "%s[%s]", (0 == strncmp(host, "https://", 8) ? "" : "https://"), host);
else
zbx_snprintf(https_host, sizeof(https_host), "%s%s", (0 == strncmp(host, "https://", 8) ? "" : "https://"), host);
if (CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_USERAGENT, "Zabbix " ZABBIX_VERSION)) ||
CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_URL, https_host)) ||
CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_PORT, (long)port)) ||
CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_NOBODY, 1L)) ||
CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_SSL_VERIFYPEER, 0L)) ||
CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_SSL_VERIFYHOST, 0L)) ||
CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_TIMEOUT, (long)timeout)))
{
zabbix_log(LOG_LEVEL_DEBUG, "%s: could not set cURL option [%d]: %s",
__function_name, (int)opt, curl_easy_strerror(err));
goto clean;
}
if (NULL != CONFIG_SOURCE_IP)
{
if (CURLE_OK != (err = curl_easy_setopt(easyhandle, opt = CURLOPT_INTERFACE, CONFIG_SOURCE_IP)))
{
zabbix_log(LOG_LEVEL_DEBUG, "%s: could not set source interface option [%d]: %s",
__function_name, (int)opt, curl_easy_strerror(err));
goto clean;
}
}
if (CURLE_OK == (err = curl_easy_perform(easyhandle)))
*value_int = 1;
else
zabbix_log(LOG_LEVEL_DEBUG, "%s: curl_easy_perform failed for [%s:%hu]: %s",
__function_name, host, port, curl_easy_strerror(err));
clean:
curl_easy_cleanup(easyhandle);
return SYSINFO_RET_OK;
}
#endif /* HAVE_LIBCURL */
static int check_telnet(const char *host, unsigned short port, int timeout, int *value_int)
{
const char *__function_name = "check_telnet";
zbx_socket_t s;
#ifdef _WINDOWS
u_long argp = 1;
#else
int flags;
#endif
*value_int = 0;
if (SUCCEED == zbx_tcp_connect(&s, CONFIG_SOURCE_IP, host, port, timeout, ZBX_TCP_SEC_UNENCRYPTED, NULL, NULL))
{
#ifdef _WINDOWS
ioctlsocket(s.socket, FIONBIO, &argp); /* non-zero value sets the socket to non-blocking */
#else
flags = fcntl(s.socket, F_GETFL);
if (0 == (flags & O_NONBLOCK))
fcntl(s.socket, F_SETFL, flags | O_NONBLOCK);
#endif
if (SUCCEED == telnet_test_login(s.socket))
*value_int = 1;
else
zabbix_log(LOG_LEVEL_DEBUG, "Telnet check error: no login prompt");
zbx_tcp_close(&s);
}
else
zabbix_log(LOG_LEVEL_DEBUG, "%s error: %s", __function_name, zbx_socket_strerror());
return SYSINFO_RET_OK;
}
/* validation functions for service checks */
static int validate_smtp(const char *line)
{
if (0 == strncmp(line, "220", 3))
{
if ('-' == line[3])
return ZBX_TCP_EXPECT_IGNORE;
if ('\0' == line[3] || ' ' == line[3])
return ZBX_TCP_EXPECT_OK;
}
return ZBX_TCP_EXPECT_FAIL;
}
static int validate_ftp(const char *line)
{
if (0 == strncmp(line, "220 ", 4))
return ZBX_TCP_EXPECT_OK;
return ZBX_TCP_EXPECT_IGNORE;
}
static int validate_pop(const char *line)
{
return 0 == strncmp(line, "+OK", 3) ? ZBX_TCP_EXPECT_OK : ZBX_TCP_EXPECT_FAIL;
}
static int validate_nntp(const char *line)
{
if (0 == strncmp(line, "200", 3) || 0 == strncmp(line, "201", 3))
return ZBX_TCP_EXPECT_OK;
return ZBX_TCP_EXPECT_FAIL;
}
static int validate_imap(const char *line)
{
return 0 == strncmp(line, "* OK", 4) ? ZBX_TCP_EXPECT_OK : ZBX_TCP_EXPECT_FAIL;
}
int check_service(AGENT_REQUEST *request, const char *default_addr, AGENT_RESULT *result, int perf)
{
unsigned short port = 0;
char *service, *ip_str, ip[MAX_ZBX_DNSNAME_LEN + 1], *port_str;
int value_int, ret = SYSINFO_RET_FAIL;
double check_time;
check_time = zbx_time();
if (3 < request->nparam)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
return SYSINFO_RET_FAIL;
}
service = get_rparam(request, 0);
ip_str = get_rparam(request, 1);
port_str = get_rparam(request, 2);
if (NULL == service || '\0' == *service)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
return SYSINFO_RET_FAIL;
}
if (NULL == ip_str || '\0' == *ip_str)
strscpy(ip, default_addr);
else
strscpy(ip, ip_str);
if (NULL != port_str && '\0' != *port_str && SUCCEED != is_ushort(port_str, &port))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid third parameter."));
return SYSINFO_RET_FAIL;
}
if (0 == strncmp("net.tcp.service", get_rkey(request), 15))
{
if (0 == strcmp(service, "ssh"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_SSH_PORT;
ret = check_ssh(ip, port, CONFIG_TIMEOUT, &value_int);
}
else if (0 == strcmp(service, "ldap"))
{
#ifdef HAVE_LDAP
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_LDAP_PORT;
ret = check_ldap(ip, port, CONFIG_TIMEOUT, &value_int);
#else
SET_MSG_RESULT(result, zbx_strdup(NULL, "Support for LDAP check was not compiled in."));
#endif
}
else if (0 == strcmp(service, "smtp"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_SMTP_PORT;
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, validate_smtp, "QUIT\r\n", &value_int);
}
else if (0 == strcmp(service, "ftp"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_FTP_PORT;
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, validate_ftp, "QUIT\r\n", &value_int);
}
else if (0 == strcmp(service, "http"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_HTTP_PORT;
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, NULL, NULL, &value_int);
}
else if (0 == strcmp(service, "pop"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_POP_PORT;
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, validate_pop, "QUIT\r\n", &value_int);
}
else if (0 == strcmp(service, "nntp"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_NNTP_PORT;
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, validate_nntp, "QUIT\r\n", &value_int);
}
else if (0 == strcmp(service, "imap"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_IMAP_PORT;
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, validate_imap, "a1 LOGOUT\r\n", &value_int);
}
else if (0 == strcmp(service, "tcp"))
{
if (NULL == port_str || '\0' == *port_str)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid third parameter."));
return SYSINFO_RET_FAIL;
}
ret = tcp_expect(ip, port, CONFIG_TIMEOUT, NULL, NULL, NULL, &value_int);
}
else if (0 == strcmp(service, "https"))
{
#ifdef HAVE_LIBCURL
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_HTTPS_PORT;
ret = check_https(ip, port, CONFIG_TIMEOUT, &value_int);
#else
SET_MSG_RESULT(result, zbx_strdup(NULL, "Support for HTTPS check was not compiled in."));
#endif
}
else if (0 == strcmp(service, "telnet"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_TELNET_PORT;
ret = check_telnet(ip, port, CONFIG_TIMEOUT, &value_int);
}
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
return ret;
}
}
else /* net.udp.service */
{
if (0 == strcmp(service, "ntp"))
{
if (NULL == port_str || '\0' == *port_str)
port = ZBX_DEFAULT_NTP_PORT;
ret = check_ntp(ip, port, CONFIG_TIMEOUT, &value_int);
}
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
return ret;
}
}
if (SYSINFO_RET_OK == ret)
{
if (0 != perf)
{
if (0 != value_int)
{
check_time = zbx_time() - check_time;
if (ZBX_FLOAT_PRECISION > check_time)
check_time = ZBX_FLOAT_PRECISION;
SET_DBL_RESULT(result, check_time);
}
else
SET_DBL_RESULT(result, 0.0);
}
else
SET_UI64_RESULT(result, value_int);
}
return ret;
}
/* Examples:
*
* net.tcp.service[ssh]
* net.tcp.service[smtp,127.0.0.1]
* net.tcp.service[ssh,127.0.0.1,22]
*
* net.udp.service[ntp]
* net.udp.service[ntp,127.0.0.1]
* net.udp.service[ntp,127.0.0.1,123]
*
* net.tcp.service.perf[ssh]
* net.tcp.service.perf[smtp,127.0.0.1]
* net.tcp.service.perf[ssh,127.0.0.1,22]
*
* net.udp.service.perf[ntp]
* net.udp.service.perf[ntp,127.0.0.1]
* net.udp.service.perf[ntp,127.0.0.1,123]
*
* The old name for these checks is check_service[*].
*/
int CHECK_SERVICE(AGENT_REQUEST *request, AGENT_RESULT *result)
{
return check_service(request, "127.0.0.1", result, 0);
}
int CHECK_SERVICE_PERF(AGENT_REQUEST *request, AGENT_RESULT *result)
{
return check_service(request, "127.0.0.1", result, 1);
}
|