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pkg-monitoring-plugins/plugins/check_tcp.c

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/*****************************************************************************
*
* Monitoring check_tcp plugin
*
* License: GPL
* Copyright (c) 1999-2013 Monitoring Plugins Development Team
*
* Description:
*
* This file contains the check_tcp plugin
*
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* $Id$
*
*****************************************************************************/
/* progname "check_tcp" changes depending on symlink called */
char *progname;
const char *copyright = "1999-2008";
const char *email = "devel@monitoring-plugins.org";
#include "common.h"
#include "netutils.h"
#include "utils.h"
#include "utils_tcp.h"
#include <ctype.h>
#include <sys/select.h>
#ifdef HAVE_SSL
static bool check_cert = false;
static int days_till_exp_warn, days_till_exp_crit;
# define my_recv(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
# define my_send(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
#else
# define my_recv(buf, len) read(sd, buf, len)
# define my_send(buf, len) send(sd, buf, len, 0)
#endif
/* int my_recv(char *, size_t); */
static int process_arguments (int, char **);
void print_help (void);
void print_usage (void);
#define EXPECT server_expect[0]
static char *SERVICE = "TCP";
static char *SEND = NULL;
static char *QUIT = NULL;
static int PROTOCOL = IPPROTO_TCP; /* most common is default */
static int PORT = 0;
static int READ_TIMEOUT = 2;
static int server_port = 0;
static char *server_address = NULL;
static bool host_specified = false;
static char *server_send = NULL;
static char *server_quit = NULL;
static char **server_expect;
static size_t server_expect_count = 0;
static ssize_t maxbytes = 0;
static char **warn_codes = NULL;
static size_t warn_codes_count = 0;
static char **crit_codes = NULL;
static size_t crit_codes_count = 0;
static unsigned int delay = 0;
static double warning_time = 0;
static double critical_time = 0;
static double elapsed_time = 0;
static long microsec;
static int sd = 0;
#define MAXBUF 1024
static char buffer[MAXBUF];
static int expect_mismatch_state = STATE_WARNING;
static int match_flags = NP_MATCH_EXACT;
#ifdef HAVE_SSL
static char *sni = NULL;
static bool sni_specified = false;
#endif
#define FLAG_SSL 0x01
#define FLAG_VERBOSE 0x02
#define FLAG_TIME_WARN 0x04
#define FLAG_TIME_CRIT 0x08
#define FLAG_HIDE_OUTPUT 0x10
static size_t flags;
int
main (int argc, char **argv)
{
int result = STATE_UNKNOWN;
char *status = NULL;
struct timeval tv;
struct timeval timeout;
int match = -1;
fd_set rfds;
FD_ZERO(&rfds);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
/* determine program- and service-name quickly */
progname = strrchr(argv[0], '/');
if(progname != NULL) progname++;
else progname = argv[0];
size_t prog_name_len = strlen(progname);
if(prog_name_len > 6 && !memcmp(progname, "check_", 6)) {
SERVICE = strdup(progname + 6);
for(size_t i = 0; i < prog_name_len - 6; i++)
SERVICE[i] = toupper(SERVICE[i]);
}
/* set up a reasonable buffer at first (will be realloc()'ed if
* user specifies other options) */
server_expect = calloc(sizeof(char *), 2);
/* determine defaults for this service's protocol */
if (!strncmp(SERVICE, "UDP", 3)) {
PROTOCOL = IPPROTO_UDP;
}
else if (!strncmp(SERVICE, "FTP", 3)) {
EXPECT = "220";
QUIT = "QUIT\r\n";
PORT = 21;
}
else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) {
EXPECT = "+OK";
QUIT = "QUIT\r\n";
PORT = 110;
}
else if (!strncmp(SERVICE, "SMTP", 4)) {
EXPECT = "220";
QUIT = "QUIT\r\n";
PORT = 25;
}
else if (!strncmp(SERVICE, "IMAP", 4)) {
EXPECT = "* OK";
QUIT = "a1 LOGOUT\r\n";
PORT = 143;
}
#ifdef HAVE_SSL
else if (!strncmp(SERVICE, "SIMAP", 5)) {
EXPECT = "* OK";
QUIT = "a1 LOGOUT\r\n";
flags |= FLAG_SSL;
PORT = 993;
}
else if (!strncmp(SERVICE, "SPOP", 4)) {
EXPECT = "+OK";
QUIT = "QUIT\r\n";
flags |= FLAG_SSL;
PORT = 995;
}
else if (!strncmp(SERVICE, "SSMTP", 5)) {
EXPECT = "220";
QUIT = "QUIT\r\n";
flags |= FLAG_SSL;
PORT = 465;
}
else if (!strncmp(SERVICE, "JABBER", 6)) {
SEND = "<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n";
EXPECT = "<?xml version=\'1.0\'";
QUIT = "</stream:stream>\n";
flags |= FLAG_HIDE_OUTPUT;
PORT = 5222;
}
else if (!strncmp (SERVICE, "NNTPS", 5)) {
server_expect_count = 2;
server_expect[0] = "200";
server_expect[1] = "201";
QUIT = "QUIT\r\n";
flags |= FLAG_SSL;
PORT = 563;
}
#endif
else if (!strncmp (SERVICE, "NNTP", 4)) {
server_expect_count = 2;
server_expect = malloc(sizeof(char *) * server_expect_count);
server_expect[0] = strdup("200");
server_expect[1] = strdup("201");
QUIT = "QUIT\r\n";
PORT = 119;
}
else if (!strncmp(SERVICE, "CLAMD", 5)) {
SEND = "PING";
EXPECT = "PONG";
QUIT = NULL;
PORT = 3310;
}
/* fallthrough check, so it's supposed to use reverse matching */
else if (strcmp (SERVICE, "TCP"))
usage (_("CRITICAL - Generic check_tcp called with unknown service\n"));
server_address = "127.0.0.1";
server_port = PORT;
server_send = SEND;
server_quit = QUIT;
status = NULL;
/* Parse extra opts if any */
argv=np_extra_opts (&argc, argv, progname);
if (process_arguments (argc, argv) == ERROR)
usage4 (_("Could not parse arguments"));
if(flags & FLAG_VERBOSE) {
printf("Using service %s\n", SERVICE);
printf("Port: %d\n", server_port);
printf("flags: 0x%x\n", (int)flags);
}
if(EXPECT && !server_expect_count)
server_expect_count++;
if(PROTOCOL==IPPROTO_UDP && !(server_expect_count && server_send)){
usage(_("With UDP checks, a send/expect string must be specified."));
}
/* set up the timer */
signal (SIGALRM, socket_timeout_alarm_handler);
alarm (socket_timeout);
/* try to connect to the host at the given port number */
gettimeofday (&tv, NULL);
result = np_net_connect (server_address, server_port, &sd, PROTOCOL);
if (result == STATE_CRITICAL) return econn_refuse_state;
#ifdef HAVE_SSL
if (flags & FLAG_SSL){
result = np_net_ssl_init_with_hostname(sd, (sni_specified ? sni : NULL));
if (result == STATE_OK && check_cert) {
result = np_net_ssl_check_cert(days_till_exp_warn, days_till_exp_crit);
}
}
if(result != STATE_OK){
if(sd) close(sd);
np_net_ssl_cleanup();
return result;
}
#endif /* HAVE_SSL */
if (server_send != NULL) { /* Something to send? */
my_send(server_send, strlen(server_send));
}
if (delay > 0) {
tv.tv_sec += delay;
sleep (delay);
}
if(flags & FLAG_VERBOSE) {
if (server_send) {
printf("Send string: %s\n", server_send);
}
if (server_quit) {
printf("Quit string: %s\n", server_quit);
}
printf("server_expect_count: %d\n", (int)server_expect_count);
for(size_t i = 0; i < server_expect_count; i++)
printf("\t%zd: %s\n", i, server_expect[i]);
}
/* if(len) later on, we know we have a non-NULL response */
ssize_t len = 0;
if (server_expect_count) {
ssize_t received = 0;
/* watch for the expect string */
while ((received = my_recv(buffer, sizeof(buffer))) > 0) {
status = realloc(status, len + received + 1);
memcpy(&status[len], buffer, received);
len += received;
status[len] = '\0';
/* stop reading if user-forced */
if (maxbytes && len >= maxbytes)
break;
if ((match = np_expect_match(status,
server_expect,
server_expect_count,
match_flags)) != NP_MATCH_RETRY)
break;
/* some protocols wait for further input, so make sure we don't wait forever */
FD_SET(sd, &rfds);
timeout.tv_sec = READ_TIMEOUT;
timeout.tv_usec = 0;
if(select(sd + 1, &rfds, NULL, NULL, &timeout) <= 0)
break;
}
if (match == NP_MATCH_RETRY)
match = NP_MATCH_FAILURE;
/* no data when expected, so return critical */
if (len == 0)
die (STATE_CRITICAL, _("No data received from host\n"));
/* print raw output if we're debugging */
if(flags & FLAG_VERBOSE)
printf("received %d bytes from host\n#-raw-recv-------#\n%s\n#-raw-recv-------#\n",
(int)len + 1, status);
/* strip whitespace from end of output */
while(--len > 0 && isspace(status[len]))
status[len] = '\0';
}
if (server_quit != NULL) {
my_send(server_quit, strlen(server_quit));
}
if (sd) close (sd);
#ifdef HAVE_SSL
np_net_ssl_cleanup();
#endif
microsec = deltime (tv);
elapsed_time = (double)microsec / 1.0e6;
if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time)
result = STATE_CRITICAL;
else if (flags & FLAG_TIME_WARN && elapsed_time > warning_time)
result = STATE_WARNING;
/* did we get the response we hoped? */
if(match == NP_MATCH_FAILURE && result != STATE_CRITICAL)
result = expect_mismatch_state;
/* reset the alarm */
alarm (0);
/* this is a bit stupid, because we don't want to print the
* response time (which can look ok to the user) if we didn't get
* the response we were looking for. if-else */
printf("%s %s - ", SERVICE, state_text(result));
if(match == NP_MATCH_FAILURE && len && !(flags & FLAG_HIDE_OUTPUT))
printf("Unexpected response from host/socket: %s", status);
else {
if(match == NP_MATCH_FAILURE)
printf("Unexpected response from host/socket on ");
else
printf("%.3f second response time on ", elapsed_time);
if(server_address[0] != '/') {
if (host_specified)
printf("%s port %d",
server_address, server_port);
else
printf("port %d", server_port);
}
else
printf("socket %s", server_address);
}
if (match != NP_MATCH_FAILURE && !(flags & FLAG_HIDE_OUTPUT) && len)
printf (" [%s]", status);
/* perf-data doesn't apply when server doesn't talk properly,
* so print all zeroes on warn and crit. Use fperfdata since
* localisation settings can make different outputs */
if(match == NP_MATCH_FAILURE)
printf ("|%s",
fperfdata ("time", elapsed_time, "s",
(flags & FLAG_TIME_WARN ? true : false), 0,
(flags & FLAG_TIME_CRIT ? true : false), 0,
true, 0,
true, socket_timeout)
);
else
printf("|%s",
fperfdata ("time", elapsed_time, "s",
(flags & FLAG_TIME_WARN ? true : false), warning_time,
(flags & FLAG_TIME_CRIT ? true : false), critical_time,
true, 0,
true, socket_timeout)
);
putchar('\n');
return result;
}
/* process command-line arguments */
static int process_arguments (int argc, char **argv) {
int c;
bool escape = false;
char *temp;
enum {
SNI_OPTION = CHAR_MAX + 1
};
int option = 0;
static struct option longopts[] = {
{"hostname", required_argument, 0, 'H'},
{"critical", required_argument, 0, 'c'},
{"warning", required_argument, 0, 'w'},
{"critical-codes", required_argument, 0, 'C'},
{"warning-codes", required_argument, 0, 'W'},
{"timeout", required_argument, 0, 't'},
{"protocol", required_argument, 0, 'P'}, /* FIXME: Unhandled */
{"port", required_argument, 0, 'p'},
{"escape", no_argument, 0, 'E'},
{"all", no_argument, 0, 'A'},
{"send", required_argument, 0, 's'},
{"expect", required_argument, 0, 'e'},
{"maxbytes", required_argument, 0, 'm'},
{"quit", required_argument, 0, 'q'},
{"jail", no_argument, 0, 'j'},
{"delay", required_argument, 0, 'd'},
{"refuse", required_argument, 0, 'r'},
{"mismatch", required_argument, 0, 'M'},
{"use-ipv4", no_argument, 0, '4'},
{"use-ipv6", no_argument, 0, '6'},
{"verbose", no_argument, 0, 'v'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{"ssl", no_argument, 0, 'S'},
{"sni", required_argument, 0, SNI_OPTION},
{"certificate", required_argument, 0, 'D'},
{0, 0, 0, 0}
};
if (argc < 2)
usage4 (_("No arguments found"));
/* backwards compatibility */
for (c = 1; c < argc; c++) {
if (strcmp ("-to", argv[c]) == 0)
strcpy (argv[c], "-t");
else if (strcmp ("-wt", argv[c]) == 0)
strcpy (argv[c], "-w");
else if (strcmp ("-ct", argv[c]) == 0)
strcpy (argv[c], "-c");
}
if (!is_option (argv[1])) {
server_address = argv[1];
argv[1] = argv[0];
argv = &argv[1];
argc--;
}
while (1) {
c = getopt_long (argc, argv, "+hVv46EAH:s:e:q:m:c:w:t:p:C:W:d:Sr:jD:M:",
longopts, &option);
if (c == -1 || c == EOF || c == 1)
break;
switch (c) {
case '?': /* print short usage statement if args not parsable */
usage5 ();
case 'h': /* help */
print_help ();
exit (STATE_UNKNOWN);
case 'V': /* version */
print_revision (progname, NP_VERSION);
exit (STATE_UNKNOWN);
case 'v': /* verbose mode */
flags |= FLAG_VERBOSE;
match_flags |= NP_MATCH_VERBOSE;
break;
case '4':
address_family = AF_INET;
break;
case '6':
#ifdef USE_IPV6
address_family = AF_INET6;
#else
usage4 (_("IPv6 support not available"));
#endif
break;
case 'H': /* hostname */
host_specified = true;
server_address = optarg;
break;
case 'c': /* critical */
critical_time = strtod (optarg, NULL);
flags |= FLAG_TIME_CRIT;
break;
case 'j': /* hide output */
flags |= FLAG_HIDE_OUTPUT;
break;
case 'w': /* warning */
warning_time = strtod (optarg, NULL);
flags |= FLAG_TIME_WARN;
break;
case 'C':
crit_codes = realloc (crit_codes, ++crit_codes_count);
crit_codes[crit_codes_count - 1] = optarg;
break;
case 'W':
warn_codes = realloc (warn_codes, ++warn_codes_count);
warn_codes[warn_codes_count - 1] = optarg;
break;
case 't': /* timeout */
if (!is_intpos (optarg))
usage4 (_("Timeout interval must be a positive integer"));
else
socket_timeout = atoi (optarg);
break;
case 'p': /* port */
if (!is_intpos (optarg))
usage4 (_("Port must be a positive integer"));
else
server_port = atoi (optarg);
break;
case 'E':
escape = true;
break;
case 's':
if (escape)
server_send = np_escaped_string(optarg);
else
xasprintf(&server_send, "%s", optarg);
break;
case 'e': /* expect string (may be repeated) */
match_flags &= ~NP_MATCH_EXACT;
if (server_expect_count == 0)
server_expect = malloc (sizeof (char *) * (++server_expect_count));
else
server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
server_expect[server_expect_count - 1] = optarg;
break;
case 'm':
if (!is_intpos (optarg))
usage4 (_("Maxbytes must be a positive integer"));
else
maxbytes = strtol (optarg, NULL, 0);
break;
case 'q':
if (escape)
server_quit = np_escaped_string(optarg);
else
xasprintf(&server_quit, "%s\r\n", optarg);
break;
case 'r':
if (!strncmp(optarg,"ok",2))
econn_refuse_state = STATE_OK;
else if (!strncmp(optarg,"warn",4))
econn_refuse_state = STATE_WARNING;
else if (!strncmp(optarg,"crit",4))
econn_refuse_state = STATE_CRITICAL;
else
usage4 (_("Refuse must be one of ok, warn, crit"));
break;
case 'M':
if (!strncmp(optarg,"ok",2))
expect_mismatch_state = STATE_OK;
else if (!strncmp(optarg,"warn",4))
expect_mismatch_state = STATE_WARNING;
else if (!strncmp(optarg,"crit",4))
expect_mismatch_state = STATE_CRITICAL;
else
usage4 (_("Mismatch must be one of ok, warn, crit"));
break;
case 'd':
if (is_intpos (optarg))
delay = atoi (optarg);
else
usage4 (_("Delay must be a positive integer"));
break;
case 'D': /* Check SSL cert validity - days 'til certificate expiration */
#ifdef HAVE_SSL
# ifdef USE_OPENSSL /* XXX */
if ((temp=strchr(optarg,','))!=NULL) {
*temp='\0';
if (!is_intnonneg (optarg))
usage2 (_("Invalid certificate expiration period"), optarg);
days_till_exp_warn = atoi (optarg);
*temp=',';
temp++;
if (!is_intnonneg (temp))
usage2 (_("Invalid certificate expiration period"), temp);
days_till_exp_crit = atoi (temp);
}
else {
days_till_exp_crit=0;
if (!is_intnonneg (optarg))
usage2 (_("Invalid certificate expiration period"), optarg);
days_till_exp_warn = atoi (optarg);
}
check_cert = true;
flags |= FLAG_SSL;
break;
# endif /* USE_OPENSSL */
#endif
/* fallthrough if we don't have ssl */
case 'S':
#ifdef HAVE_SSL
flags |= FLAG_SSL;
#else
die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
#endif
break;
case SNI_OPTION:
#ifdef HAVE_SSL
flags |= FLAG_SSL;
sni_specified = true;
sni = optarg;
#else
die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
#endif
break;
case 'A':
match_flags |= NP_MATCH_ALL;
break;
}
}
c = optind;
if(!host_specified && c < argc)
server_address = strdup (argv[c++]);
if (server_address == NULL)
usage4 (_("You must provide a server address"));
else if (server_address[0] != '/' && !is_host(server_address))
die (STATE_CRITICAL, "%s %s - %s: %s\n", SERVICE, state_text(STATE_CRITICAL), _("Invalid hostname, address or socket"), server_address);
return OK;
}
void
print_help (void)
{
print_revision (progname, NP_VERSION);
printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
printf (COPYRIGHT, copyright, email);
printf (_("This plugin tests %s connections with the specified host (or unix socket).\n\n"),
SERVICE);
print_usage ();
printf (UT_HELP_VRSN);
printf (UT_EXTRA_OPTS);
printf (UT_HOST_PORT, 'p', "none");
printf (UT_IPv46);
printf (" %s\n", "-E, --escape");
printf (" %s\n", _("Can use \\n, \\r, \\t or \\\\ in send or quit string. Must come before send or quit option"));
printf (" %s\n", _("Default: nothing added to send, \\r\\n added to end of quit"));
printf (" %s\n", "-s, --send=STRING");
printf (" %s\n", _("String to send to the server"));
printf (" %s\n", "-e, --expect=STRING");
printf (" %s %s\n", _("String to expect in server response"), _("(may be repeated)"));
printf (" %s\n", "-A, --all");
printf (" %s\n", _("All expect strings need to occur in server response. Default is any"));
printf (" %s\n", "-q, --quit=STRING");
printf (" %s\n", _("String to send server to initiate a clean close of the connection"));
printf (" %s\n", "-r, --refuse=ok|warn|crit");
printf (" %s\n", _("Accept TCP refusals with states ok, warn, crit (default: crit)"));
printf (" %s\n", "-M, --mismatch=ok|warn|crit");
printf (" %s\n", _("Accept expected string mismatches with states ok, warn, crit (default: warn)"));
printf (" %s\n", "-j, --jail");
printf (" %s\n", _("Hide output from TCP socket"));
printf (" %s\n", "-m, --maxbytes=INTEGER");
printf (" %s\n", _("Close connection once more than this number of bytes are received"));
printf (" %s\n", "-d, --delay=INTEGER");
printf (" %s\n", _("Seconds to wait between sending string and polling for response"));
#ifdef HAVE_SSL
printf (" %s\n", "-D, --certificate=INTEGER[,INTEGER]");
printf (" %s\n", _("Minimum number of days a certificate has to be valid."));
printf (" %s\n", _("1st is #days for warning, 2nd is critical (if not specified - 0)."));
printf (" %s\n", "-S, --ssl");
printf (" %s\n", _("Use SSL for the connection."));
printf (" %s\n", "--sni=STRING");
printf (" %s\n", _("SSL server_name"));
#endif
printf (UT_WARN_CRIT);
printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
printf (UT_VERBOSE);
printf (UT_SUPPORT);
}
void
print_usage (void)
{
printf ("%s\n", _("Usage:"));
printf ("%s -H host -p port [-w <warning time>] [-c <critical time>] [-s <send string>]\n",progname);
printf ("[-e <expect string>] [-q <quit string>][-m <maximum bytes>] [-d <delay>]\n");
printf ("[-t <timeout seconds>] [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n");
printf ("[-D <warn days cert expire>[,<crit days cert expire>]] [-S <use SSL>] [-E]\n");
}
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