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pkg-monitoring-plugins/plugins/check_tcp.c

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remove source-dist branch
2006-01-20 18:48:40 +00:00
/*****************************************************************************
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: check_tcp.c,v 1.66 2005/06/05 17:43:58 seanius Exp $
*****************************************************************************/
/* progname "check_tcp" changes depending on symlink called */
char *progname;
const char *revision = "$Revision: 1.66 $";
const char *copyright = "1999-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
#include "common.h"
#include "netutils.h"
#include "utils.h"
#ifdef HAVE_SSL_H
# include <rsa.h>
# include <crypto.h>
# include <x509.h>
# include <pem.h>
# include <ssl.h>
# include <err.h>
#else
# ifdef HAVE_OPENSSL_SSL_H
# include <openssl/rsa.h>
# include <openssl/crypto.h>
# include <openssl/x509.h>
# include <openssl/pem.h>
# include <openssl/ssl.h>
# include <openssl/err.h>
# endif
#endif
#ifdef HAVE_SSL
static int check_cert = FALSE;
static int days_till_exp;
static char *randbuff = "";
static SSL_CTX *ctx;
static SSL *ssl;
static X509 *server_cert;
static int connect_SSL (void);
static int check_certificate (X509 **);
# define my_recv(buf, len) ((flags & FLAG_SSL) ? SSL_read(ssl, buf, len) : read(sd, buf, len))
#else
# define my_recv(buf, len) read(sd, buf, len)
#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 char timestamp[17] = "";
static int server_port = 0;
static char *server_address = NULL;
static char *server_send = NULL;
static char *server_quit = NULL;
static char **server_expect;
static size_t server_expect_count = 0;
static size_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;
#define FLAG_SSL 0x01
#define FLAG_VERBOSE 0x02
#define FLAG_EXACT_MATCH 0x04
#define FLAG_TIME_WARN 0x08
#define FLAG_TIME_CRIT 0x10
#define FLAG_HIDE_OUTPUT 0x20
static size_t flags = FLAG_EXACT_MATCH;
int
main (int argc, char **argv)
{
int result = STATE_UNKNOWN;
int i;
char *status = NULL;
struct timeval tv;
size_t len, match = -1;
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];
len = strlen(progname);
if(len > 6 && !memcmp(progname, "check_", 6)) {
SERVICE = progname + 6;
for(i = 0; i < len - 6; i++)
SERVICE[i] = toupper(SERVICE[i]);
}
/* set up a resonable 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\'?><stream:stream xmlns:stream=\'http://etherx.jabber.org/streams\'";
QUIT = "</stream:stream>\n";
flags |= FLAG_SSL | 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;
}
/* 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;
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", PORT);
printf("flags: 0x%x\n", flags);
}
if(EXPECT && !server_expect_count)
server_expect_count++;
/* 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);
#ifdef HAVE_SSL
if (flags & FLAG_SSL && check_cert == TRUE) {
if (connect_SSL () != OK)
die (STATE_CRITICAL,_("CRITICAL - Could not make SSL connection\n"));
if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
result = check_certificate (&server_cert);
X509_free(server_cert);
}
else {
printf(_("CRITICAL - Cannot retrieve server certificate.\n"));
result = STATE_CRITICAL;
}
SSL_shutdown (ssl);
SSL_free (ssl);
SSL_CTX_free (ctx);
close (sd);
return result;
}
else if (flags & FLAG_SSL)
result = connect_SSL ();
else
#endif
result = np_net_connect (server_address, server_port, &sd, PROTOCOL);
if (result == STATE_CRITICAL)
return STATE_CRITICAL;
if (server_send != NULL) { /* Something to send? */
#ifdef HAVE_SSL
if (flags & FLAG_SSL)
SSL_write(ssl, server_send, (int)strlen(server_send));
else
#endif
send (sd, server_send, strlen(server_send), 0);
}
if (delay > 0) {
tv.tv_sec += delay;
sleep (delay);
}
if(flags & FLAG_VERBOSE) {
printf("server_expect_count: %d\n", server_expect_count);
for(i = 0; i < server_expect_count; i++)
printf("\t%d: %s\n", i, server_expect[i]);
}
/* if(len) later on, we know we have a non-NULL response */
len = 0;
if (server_expect_count) {
/* watch for the expect string */
while ((i = my_recv(buffer, sizeof(buffer))) > 0) {
status = realloc(status, len + i + 1);
memcpy(&status[len], buffer, i);
len += i;
/* stop reading if user-forced or data-starved */
if(i < sizeof(buffer) || (maxbytes && len >= maxbytes))
break;
if (maxbytes && len >= maxbytes)
break;
}
/* no data when expected, so return critical */
if (len == 0)
die (STATE_CRITICAL, _("No data received from host\n"));
/* force null-termination and strip whitespace from end of output */
status[len--] = '\0';
/* 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",
len + 1, status);
while(isspace(status[len])) status[len--] = '\0';
for (i = 0; i < server_expect_count; i++) {
match = -2; /* tag it so we know if we tried and failed */
if (flags & FLAG_VERBOSE)
printf ("looking for [%s] %s [%s]\n", server_expect[i],
(flags & FLAG_EXACT_MATCH) ? "in beginning of" : "anywhere in",
status);
/* match it. math first in short-circuit */
if ((flags & FLAG_EXACT_MATCH && !strncmp(status, server_expect[i], strlen(server_expect[i]))) ||
(!(flags & FLAG_EXACT_MATCH) && strstr(status, server_expect[i])))
{
if(flags & FLAG_VERBOSE) puts("found it");
match = i;
break;
}
}
}
if (server_quit != NULL) {
#ifdef HAVE_SSL
if (flags & FLAG_SSL) {
SSL_write (ssl, server_quit, (int)strlen(server_quit));
SSL_shutdown (ssl);
SSL_free (ssl);
SSL_CTX_free (ctx);
}
else
#endif
send (sd, server_quit, strlen (server_quit), 0);
}
/* close the connection */
if (sd)
close (sd);
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 == -2 && result != STATE_CRITICAL)
result = STATE_WARNING;
/* 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 == -2 && len && !(flags & FLAG_HIDE_OUTPUT))
printf("Unexpected response from host: %s", status);
else
printf("%.3f second response time on port %d",
elapsed_time, server_port);
if (match != -2 && !(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 */
if(match == -2)
printf ("|time=%fs;0.0;0.0;0.0;0.0", elapsed_time);
else
printf("|%s",
fperfdata ("time", elapsed_time, "s",
TRUE, warning_time,
TRUE, 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;
int option = 0;
static struct option longopts[] = {
{"hostname", required_argument, 0, 'H'},
{"critical-time", required_argument, 0, 'c'},
{"warning-time", 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'},
{"port", required_argument, 0, 'p'},
{"send", required_argument, 0, 's'},
{"expect", required_argument, 0, 'e'},
{"maxbytes", required_argument, 0, 'm'},
{"quit", required_argument, 0, 'q'},
{"jail", required_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'},
#ifdef HAVE_SSL
{"ssl", no_argument, 0, 'S'},
{"certificate", required_argument, 0, 'D'},
#endif
{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, "+hVv46H: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 */
usage2 (_("Unknown argument"), optarg);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'V': /* version */
print_revision (progname, revision);
exit (STATE_OK);
case 'v': /* verbose mode */
flags |= FLAG_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 */
if (is_host (optarg) == FALSE)
usage2 (_("Invalid hostname/address"), optarg);
server_address = optarg;
break;
case 'c': /* critical */
if (!is_intnonneg (optarg))
usage4 (_("Critical threshold must be a positive integer"));
else
critical_time = strtod (optarg, NULL);
flags |= FLAG_TIME_CRIT;
break;
case 'j': /* hide output */
flags |= FLAG_HIDE_OUTPUT;
break;
case 'w': /* warning */
if (!is_intnonneg (optarg))
usage4 (_("Warning threshold must be a positive integer"));
else
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 's':
server_send = optarg;
break;
case 'e': /* expect string (may be repeated) */
EXPECT = NULL;
flags &= ~FLAG_EXACT_MATCH;
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);
case 'q':
asprintf(&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
if (!is_intnonneg (optarg))
usage2 (_("Invalid certificate expiration period"), optarg);
days_till_exp = atoi (optarg);
check_cert = TRUE;
flags |= FLAG_SSL;
break;
#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;
}
}
if (server_address == NULL)
usage4 (_("You must provide a server address"));
return TRUE;
}
/* SSL-specific functions */
#ifdef HAVE_SSL
static int
connect_SSL (void)
{
SSL_METHOD *meth;
/* Initialize SSL context */
SSLeay_add_ssl_algorithms ();
meth = SSLv23_client_method ();
SSL_load_error_strings ();
OpenSSL_add_all_algorithms();
if ((ctx = SSL_CTX_new (meth)) == NULL)
{
printf (_("CRITICAL - Cannot create SSL context.\n"));
return STATE_CRITICAL;
}
/* Initialize alarm signal handling */
signal (SIGALRM, socket_timeout_alarm_handler);
/* Set socket timeout */
alarm (socket_timeout);
/* Save start time */
time (&start_time);
/* Make TCP connection */
if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK && was_refused == FALSE)
{
/* Do the SSL handshake */
if ((ssl = SSL_new (ctx)) != NULL)
{
SSL_set_fd (ssl, sd);
if (SSL_connect(ssl) == 1)
return OK;
/* ERR_print_errors_fp (stderr); */
printf (_("CRITICAL - Cannot make SSL connection "));
ERR_print_errors_fp (stdout);
/* printf("\n"); */
}
else
{
printf (_("CRITICAL - Cannot initiate SSL handshake.\n"));
}
SSL_free (ssl);
}
SSL_CTX_free (ctx);
close (sd);
return STATE_CRITICAL;
}
static int
check_certificate (X509 ** certificate)
{
ASN1_STRING *tm;
int offset;
struct tm stamp;
int days_left;
/* Retrieve timestamp of certificate */
tm = X509_get_notAfter (*certificate);
/* Generate tm structure to process timestamp */
if (tm->type == V_ASN1_UTCTIME) {
if (tm->length < 10) {
printf (_("CRITICAL - Wrong time format in certificate.\n"));
return STATE_CRITICAL;
}
else {
stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
if (stamp.tm_year < 50)
stamp.tm_year += 100;
offset = 0;
}
}
else {
if (tm->length < 12) {
printf (_("CRITICAL - Wrong time format in certificate.\n"));
return STATE_CRITICAL;
}
else {
stamp.tm_year =
(tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
(tm->data[2] - '0') * 10 + (tm->data[3] - '0');
stamp.tm_year -= 1900;
offset = 2;
}
}
stamp.tm_mon =
(tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
stamp.tm_mday =
(tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
stamp.tm_hour =
(tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
stamp.tm_min =
(tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
stamp.tm_sec = 0;
stamp.tm_isdst = -1;
days_left = (mktime (&stamp) - time (NULL)) / 86400;
snprintf
(timestamp, 16, "%02d/%02d/%04d %02d:%02d",
stamp.tm_mon + 1,
stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
if (days_left > 0 && days_left <= days_till_exp) {
printf (_("Certificate expires in %d day(s) (%s).\n"), days_left, timestamp);
return STATE_WARNING;
}
if (days_left < 0) {
printf (_("Certificate expired on %s.\n"), timestamp);
return STATE_CRITICAL;
}
if (days_left == 0) {
printf (_("Certificate expires today (%s).\n"), timestamp);
return STATE_WARNING;
}
printf (_("Certificate will expire on %s.\n"), timestamp);
return STATE_OK;
}
#endif /* HAVE_SSL */
void
print_help (void)
{
print_revision (progname, revision);
printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
printf (COPYRIGHT, copyright, email);
printf (_("This plugin tests %s connections with the specified host.\n\n"),
SERVICE);
print_usage ();
printf (_(UT_HELP_VRSN));
printf (_(UT_HOST_PORT), 'p', "none");
printf (_(UT_IPv46));
printf (_("\
-s, --send=STRING\n\
String to send to the server\n\
-e, --expect=STRING\n\
String to expect in server response\n\
-q, --quit=STRING\n\
String to send server to initiate a clean close of the connection\n"));
printf (_("\
-r, --refuse=ok|warn|crit\n\
Accept tcp refusals with states ok, warn, crit (default: crit)\n\
-M, --mismatch=ok|warn|crit\n\
Accept expected string mismatches with states ok, warn, crit (default: warn)\n\
-j, --jail\n\
Hide output from TCP socket\n\
-m, --maxbytes=INTEGER\n\
Close connection once more than this number of bytes are received\n\
-d, --delay=INTEGER\n\
Seconds to wait between sending string and polling for response\n"));
#ifdef HAVE_SSL
printf (_("\
-D, --certificate=INTEGER\n\
Minimum number of days a certificate has to be valid.\n\
-S, --ssl\n\
Use SSL for the connection.\n"));
#endif
printf (_(UT_WARN_CRIT));
printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
printf (_(UT_VERBOSE));
printf (_(UT_SUPPORT));
}
void
print_usage (void)
{
printf ("\
Usage: %s -H host -p port [-w <warning time>] [-c <critical time>]\n\
[-s <send string>] [-e <expect string>] [-q <quit string>]\n\
[-m <maximum bytes>] [-d <delay>] [-t <timeout seconds>]\n\
[-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n\
[-D <days to cert expiry>] [-S <use SSL>]\n", progname);
}
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