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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 "threads.h"
#include "comms.h"
#include "cfg.h"
#include "log.h"
#include "zbxgetopt.h"
#include "../libs/zbxcrypto/tls.h"
#ifndef _WINDOWS
# include "zbxnix.h"
#endif
const char *progname = NULL;
const char title_message[] = "zabbix_get";
const char syslog_app_name[] = "zabbix_get";
const char *usage_message[] = {
"-s host-name-or-IP", "[-p port-number]", "[-I IP-address]", "-k item-key", NULL,
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
"-s host-name-or-IP", "[-p port-number]", "[-I IP-address]", "--tls-connect cert", "--tls-ca-file CA-file",
"[--tls-crl-file CRL-file]", "[--tls-agent-cert-issuer cert-issuer]", "[--tls-agent-cert-subject cert-subject]",
"--tls-cert-file cert-file", "--tls-key-file key-file", "-k item-key", NULL,
"-s host-name-or-IP", "[-p port-number]", "[-I IP-address]", "--tls-connect psk",
"--tls-psk-identity PSK-identity", "--tls-psk-file PSK-file", "-k item-key", NULL,
#endif
"-h", NULL,
"-V", NULL,
NULL /* end of text */
};
unsigned char program_type = ZBX_PROGRAM_TYPE_GET;
const char *help_message[] = {
"Get data from Zabbix agent.",
"",
"General options:",
" -s --host host-name-or-IP Specify host name or IP address of a host",
" -p --port port-number Specify port number of agent running on the host",
" (default: " ZBX_DEFAULT_AGENT_PORT_STR ")",
" -I --source-address IP-address Specify source IP address",
"",
" -k --key item-key Specify key of the item to retrieve value for",
"",
" -h --help Display this help message",
" -V --version Display version number",
"",
"TLS connection options:",
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
" --tls-connect value How to connect to agent. Values:",
" unencrypted - connect without encryption",
" (default)",
" psk - connect using TLS and a pre-shared",
" key",
" cert - connect using TLS and a",
" certificate",
"",
" --tls-ca-file CA-file Full pathname of a file containing the top-level",
" CA(s) certificates for peer certificate",
" verification",
"",
" --tls-crl-file CRL-file Full pathname of a file containing revoked",
" certificates",
"",
" --tls-agent-cert-issuer cert-issuer Allowed agent certificate issuer",
"",
" --tls-agent-cert-subject cert-subject Allowed agent certificate subject",
"",
" --tls-cert-file cert-file Full pathname of a file containing the certificate",
" or certificate chain",
"",
" --tls-key-file key-file Full pathname of a file containing the private key",
"",
" --tls-psk-identity PSK-identity Unique, case sensitive string used to",
" identify the pre-shared key",
"",
" --tls-psk-file PSK-file Full pathname of a file containing the pre-shared",
" key",
#else
" Not available. This 'zabbix_get' was compiled without TLS support",
#endif
"",
"Example(s):",
" zabbix_get -s 127.0.0.1 -p " ZBX_DEFAULT_AGENT_PORT_STR " -k \"system.cpu.load[all,avg1]\"",
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
"",
" zabbix_get -s 127.0.0.1 -p " ZBX_DEFAULT_AGENT_PORT_STR " -k \"system.cpu.load[all,avg1]\" \\",
" --tls-connect cert --tls-ca-file /home/zabbix/zabbix_ca_file \\",
" --tls-agent-cert-issuer \\",
" \"CN=Signing CA,OU=IT operations,O=Example Corp,DC=example,DC=com\" \\",
" --tls-agent-cert-subject \\",
" \"CN=server1,OU=IT operations,O=Example Corp,DC=example,DC=com\" \\",
" --tls-cert-file /home/zabbix/zabbix_get.crt \\",
" --tls-key-file /home/zabbix/zabbix_get.key",
"",
" zabbix_get -s 127.0.0.1 -p " ZBX_DEFAULT_AGENT_PORT_STR " -k \"system.cpu.load[all,avg1]\" \\",
" --tls-connect psk --tls-psk-identity \"PSK ID Zabbix agentd\" \\",
" --tls-psk-file /home/zabbix/zabbix_agentd.psk",
#endif
NULL /* end of text */
};
/* TLS parameters */
unsigned int configured_tls_connect_mode = ZBX_TCP_SEC_UNENCRYPTED;
unsigned int configured_tls_accept_modes = ZBX_TCP_SEC_UNENCRYPTED; /* not used in zabbix_get, just for linking */
/* with tls.c */
char *CONFIG_TLS_CONNECT = NULL;
char *CONFIG_TLS_ACCEPT = NULL; /* not used in zabbix_get, just for linking with tls.c */
char *CONFIG_TLS_CA_FILE = NULL;
char *CONFIG_TLS_CRL_FILE = NULL;
char *CONFIG_TLS_SERVER_CERT_ISSUER = NULL;
char *CONFIG_TLS_SERVER_CERT_SUBJECT = NULL;
char *CONFIG_TLS_CERT_FILE = NULL;
char *CONFIG_TLS_KEY_FILE = NULL;
char *CONFIG_TLS_PSK_IDENTITY = NULL;
char *CONFIG_TLS_PSK_FILE = NULL;
int CONFIG_PASSIVE_FORKS = 0; /* not used in zabbix_get, just for linking with tls.c */
int CONFIG_ACTIVE_FORKS = 0; /* not used in zabbix_get, just for linking with tls.c */
/* COMMAND LINE OPTIONS */
/* long options */
struct zbx_option longopts[] =
{
{"host", 1, NULL, 's'},
{"port", 1, NULL, 'p'},
{"key", 1, NULL, 'k'},
{"source-address", 1, NULL, 'I'},
{"help", 0, NULL, 'h'},
{"version", 0, NULL, 'V'},
{"tls-connect", 1, NULL, '1'},
{"tls-ca-file", 1, NULL, '2'},
{"tls-crl-file", 1, NULL, '3'},
{"tls-agent-cert-issuer", 1, NULL, '4'},
{"tls-agent-cert-subject", 1, NULL, '5'},
{"tls-cert-file", 1, NULL, '6'},
{"tls-key-file", 1, NULL, '7'},
{"tls-psk-identity", 1, NULL, '8'},
{"tls-psk-file", 1, NULL, '9'},
{NULL}
};
/* short options */
static char shortopts[] = "s:p:k:I:hV";
/* end of COMMAND LINE OPTIONS */
#if !defined(_WINDOWS)
/******************************************************************************
* *
* Function: get_signal_handler *
* *
* Purpose: process signals *
* *
* Parameters: sig - signal ID *
* *
* Return value: *
* *
* Comments: *
* *
******************************************************************************/
static void get_signal_handler(int sig)
{
if (SIGPIPE == sig) /* this signal is raised when peer closes connection because of access restrictions */
return;
if (SIGALRM == sig)
zbx_error("Timeout while executing operation");
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
if (ZBX_TCP_SEC_UNENCRYPTED != configured_tls_connect_mode)
zbx_tls_free_on_signal();
#endif
exit(EXIT_FAILURE);
}
#endif /* not WINDOWS */
/******************************************************************************
* *
* Function: get_value *
* *
* Purpose: connect to Zabbix agent, receive and print value *
* *
* Parameters: host - server name or IP address *
* port - port number *
* key - item's key *
* *
******************************************************************************/
static int get_value(const char *source_ip, const char *host, unsigned short port, const char *key)
{
zbx_socket_t s;
int ret;
ssize_t bytes_received = -1;
char *tls_arg1, *tls_arg2;
switch (configured_tls_connect_mode)
{
case ZBX_TCP_SEC_UNENCRYPTED:
tls_arg1 = NULL;
tls_arg2 = NULL;
break;
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
case ZBX_TCP_SEC_TLS_CERT:
tls_arg1 = CONFIG_TLS_SERVER_CERT_ISSUER;
tls_arg2 = CONFIG_TLS_SERVER_CERT_SUBJECT;
break;
case ZBX_TCP_SEC_TLS_PSK:
tls_arg1 = CONFIG_TLS_PSK_IDENTITY;
tls_arg2 = NULL; /* zbx_tls_connect() will find PSK */
break;
#endif
default:
THIS_SHOULD_NEVER_HAPPEN;
return FAIL;
}
if (SUCCEED == (ret = zbx_tcp_connect(&s, source_ip, host, port, GET_SENDER_TIMEOUT,
configured_tls_connect_mode, tls_arg1, tls_arg2)))
{
if (SUCCEED == (ret = zbx_tcp_send(&s, key)))
{
if (0 < (bytes_received = zbx_tcp_recv_ext(&s, 0)))
{
if (0 == strcmp(s.buffer, ZBX_NOTSUPPORTED) && sizeof(ZBX_NOTSUPPORTED) < s.read_bytes)
{
zbx_rtrim(s.buffer + sizeof(ZBX_NOTSUPPORTED), "\r\n");
printf("%s: %s\n", s.buffer, s.buffer + sizeof(ZBX_NOTSUPPORTED));
}
else
{
zbx_rtrim(s.buffer, "\r\n");
printf("%s\n", s.buffer);
}
}
else
{
if (0 == bytes_received)
zbx_error("Check access restrictions in Zabbix agent configuration");
ret = FAIL;
}
}
zbx_tcp_close(&s);
if (SUCCEED != ret && 0 != bytes_received)
{
zbx_error("Get value error: %s", zbx_socket_strerror());
zbx_error("Check access restrictions in Zabbix agent configuration");
}
}
else
zbx_error("Get value error: %s", zbx_socket_strerror());
return ret;
}
/******************************************************************************
* *
* Function: main *
* *
* Purpose: main function *
* *
* Parameters: *
* *
* Return value: *
* *
* Comments: *
* *
******************************************************************************/
int main(int argc, char **argv)
{
int i, ret = SUCCEED;
char *host = NULL, *key = NULL, *source_ip = NULL, ch;
unsigned short opt_count[256] = {0}, port = ZBX_DEFAULT_AGENT_PORT;
#if !defined(_WINDOWS) && (defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL))
if (SUCCEED != zbx_coredump_disable())
{
zbx_error("cannot disable core dump, exiting...");
exit(EXIT_FAILURE);
}
#endif
progname = get_program_name(argv[0]);
/* parse the command-line */
while ((char)EOF != (ch = (char)zbx_getopt_long(argc, argv, shortopts, longopts, NULL)))
{
opt_count[(unsigned char)ch]++;
switch (ch)
{
case 'k':
if (NULL == key)
key = zbx_strdup(NULL, zbx_optarg);
break;
case 'p':
port = (unsigned short)atoi(zbx_optarg);
break;
case 's':
if (NULL == host)
host = zbx_strdup(NULL, zbx_optarg);
break;
case 'I':
if (NULL == source_ip)
source_ip = zbx_strdup(NULL, zbx_optarg);
break;
case 'h':
help();
exit(EXIT_SUCCESS);
break;
case 'V':
version();
exit(EXIT_SUCCESS);
break;
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
case '1':
CONFIG_TLS_CONNECT = zbx_strdup(CONFIG_TLS_CONNECT, zbx_optarg);
break;
case '2':
CONFIG_TLS_CA_FILE = zbx_strdup(CONFIG_TLS_CA_FILE, zbx_optarg);
break;
case '3':
CONFIG_TLS_CRL_FILE = zbx_strdup(CONFIG_TLS_CRL_FILE, zbx_optarg);
break;
case '4':
CONFIG_TLS_SERVER_CERT_ISSUER = zbx_strdup(CONFIG_TLS_SERVER_CERT_ISSUER, zbx_optarg);
break;
case '5':
CONFIG_TLS_SERVER_CERT_SUBJECT = zbx_strdup(CONFIG_TLS_SERVER_CERT_SUBJECT, zbx_optarg);
break;
case '6':
CONFIG_TLS_CERT_FILE = zbx_strdup(CONFIG_TLS_CERT_FILE, zbx_optarg);
break;
case '7':
CONFIG_TLS_KEY_FILE = zbx_strdup(CONFIG_TLS_KEY_FILE, zbx_optarg);
break;
case '8':
CONFIG_TLS_PSK_IDENTITY = zbx_strdup(CONFIG_TLS_PSK_IDENTITY, zbx_optarg);
break;
case '9':
CONFIG_TLS_PSK_FILE = zbx_strdup(CONFIG_TLS_PSK_FILE, zbx_optarg);
break;
#else
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
zbx_error("TLS parameters cannot be used: 'zabbix_get' was compiled without TLS"
" support");
exit(EXIT_FAILURE);
break;
#endif
default:
usage();
exit(EXIT_FAILURE);
break;
}
}
if (NULL == host || NULL == key)
{
usage();
ret = FAIL;
}
/* every option may be specified only once */
for (i = 0; NULL != longopts[i].name; i++)
{
ch = longopts[i].val;
if (1 < opt_count[(unsigned char)ch])
{
if (NULL == strchr(shortopts, ch))
zbx_error("option \"--%s\" specified multiple times", longopts[i].name);
else
zbx_error("option \"-%c\" or \"--%s\" specified multiple times", ch, longopts[i].name);
ret = FAIL;
}
}
if (FAIL == ret)
goto out;
/* Parameters which are not option values are invalid. The check relies on zbx_getopt_internal() which */
/* always permutes command line arguments regardless of POSIXLY_CORRECT environment variable. */
if (argc > zbx_optind)
{
for (i = zbx_optind; i < argc; i++)
zbx_error("invalid parameter \"%s\"", argv[i]);
ret = FAIL;
}
if (FAIL == ret)
{
printf("Try '%s --help' for more information.\n", progname);
goto out;
}
if (NULL != CONFIG_TLS_CONNECT || NULL != CONFIG_TLS_CA_FILE || NULL != CONFIG_TLS_CRL_FILE ||
NULL != CONFIG_TLS_SERVER_CERT_ISSUER || NULL != CONFIG_TLS_SERVER_CERT_SUBJECT ||
NULL != CONFIG_TLS_CERT_FILE || NULL != CONFIG_TLS_KEY_FILE ||
NULL != CONFIG_TLS_PSK_IDENTITY || NULL != CONFIG_TLS_PSK_FILE)
{
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
zbx_tls_validate_config();
if (ZBX_TCP_SEC_UNENCRYPTED != configured_tls_connect_mode)
{
#if defined(_WINDOWS)
zbx_tls_init_parent();
#endif
zbx_tls_init_child();
}
#endif
}
#if !defined(_WINDOWS)
signal(SIGINT, get_signal_handler);
signal(SIGTERM, get_signal_handler);
signal(SIGQUIT, get_signal_handler);
signal(SIGALRM, get_signal_handler);
signal(SIGPIPE, get_signal_handler);
#endif
ret = get_value(source_ip, host, port, key);
out:
zbx_free(host);
zbx_free(key);
zbx_free(source_ip);
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
if (ZBX_TCP_SEC_UNENCRYPTED != configured_tls_connect_mode)
{
zbx_tls_free();
#if defined(_WINDOWS)
zbx_tls_library_deinit();
#endif
}
#endif
return SUCCEED == ret ? EXIT_SUCCESS : EXIT_FAILURE;
}
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