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/*****************************************************************************
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_dig.c,v 1.40 2005/01/26 21:21:01 tonvoon Exp $
*****************************************************************************/
const char *progname = "check_dig";
const char *revision = "$Revision: 1.40 $";
const char *copyright = "2002-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
#include "common.h"
#include "netutils.h"
#include "utils.h"
#include "popen.h"
int process_arguments (int, char **);
int validate_arguments (void);
void print_help (void);
void print_usage (void);
enum {
UNDEFINED = 0,
DEFAULT_PORT = 53
};
char *query_address = NULL;
char *record_type = "A";
char *expected_address = NULL;
char *dns_server = NULL;
int verbose = FALSE;
int server_port = DEFAULT_PORT;
double warning_interval = UNDEFINED;
double critical_interval = UNDEFINED;
struct timeval tv;
int
main (int argc, char **argv)
{
char input_buffer[MAX_INPUT_BUFFER];
char *command_line;
char *output;
char *t;
long microsec;
double elapsed_time;
int result = STATE_UNKNOWN;
output = strdup ("");
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
/* Set signal handling and alarm */
if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR)
usage4 (_("Cannot catch SIGALRM"));
if (process_arguments (argc, argv) == ERROR)
usage4 (_("Could not parse arguments"));
/* get the command to run */
asprintf (&command_line, "%s @%s -p %d %s -t %s",
PATH_TO_DIG, dns_server, server_port, query_address, record_type);
alarm (timeout_interval);
gettimeofday (&tv, NULL);
if (verbose) {
printf ("%s\n", command_line);
if(expected_address != NULL) {
printf (_("Looking for: '%s'\n"), expected_address);
} else {
printf (_("Looking for: '%s'\n"), query_address);
}
}
/* run the command */
child_process = spopen (command_line);
if (child_process == NULL) {
printf (_("Could not open pipe: %s\n"), command_line);
return STATE_UNKNOWN;
}
child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
if (child_stderr == NULL)
printf (_("Could not open stderr for %s\n"), command_line);
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
/* the server is responding, we just got the host name... */
if (strstr (input_buffer, ";; ANSWER SECTION:")) {
/* loop through the whole 'ANSWER SECTION' */
do {
/* get the host address */
if (!fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
break;
if (strpbrk (input_buffer, "\r\n"))
input_buffer[strcspn (input_buffer, "\r\n")] = '\0';
if (verbose && !strstr (input_buffer, ";; "))
printf ("%s\n", input_buffer);
if (expected_address==NULL && strstr (input_buffer, query_address) != NULL) {
output = strdup(input_buffer);
result = STATE_OK;
}
else if (expected_address != NULL && strstr (input_buffer, expected_address) != NULL) {
output = strdup(input_buffer);
result = STATE_OK;
}
/* Translate output TAB -> SPACE */
t = output;
while ((t = index(t, '\t')) != NULL)
*t = ' ';
} while (!strstr (input_buffer, ";; "));
if (result == STATE_UNKNOWN) {
asprintf (&output, _("Server not found in ANSWER SECTION"));
result = STATE_WARNING;
}
}
}
if (result == STATE_UNKNOWN) {
asprintf (&output, _("No ANSWER SECTION found"));
}
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
/* If we get anything on STDERR, at least set warning */
result = max_state (result, STATE_WARNING);
printf ("%s", input_buffer);
if (strlen (output) == 0)
output = strdup (1 + index (input_buffer, ':'));
}
(void) fclose (child_stderr);
/* close the pipe */
if (spclose (child_process)) {
result = max_state (result, STATE_WARNING);
if (strlen (output) == 0)
asprintf (&output, _("dig returned an error status"));
}
microsec = deltime (tv);
elapsed_time = (double)microsec / 1.0e6;
if (output == NULL || strlen (output) == 0)
asprintf (&output, _(" Probably a non-existent host/domain"));
if (critical_interval > UNDEFINED && elapsed_time > critical_interval)
result = STATE_CRITICAL;
else if (warning_interval > UNDEFINED && elapsed_time > warning_interval)
result = STATE_WARNING;
asprintf (&output, _("%.3f seconds response time (%s)"), elapsed_time, output);
printf ("DNS %s - %s|%s\n",
state_text (result), output,
fperfdata("time", elapsed_time, "s",
(warning_interval>UNDEFINED?TRUE:FALSE),
warning_interval,
(critical_interval>UNDEFINED?TRUE:FALSE),
critical_interval,
TRUE, 0, FALSE, 0));
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
int option = 0;
static struct option longopts[] = {
{"hostname", required_argument, 0, 'H'},
{"query_address", required_argument, 0, 'l'},
{"warning", required_argument, 0, 'w'},
{"critical", required_argument, 0, 'c'},
{"timeout", required_argument, 0, 't'},
{"verbose", no_argument, 0, 'v'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{"record_type", required_argument, 0, 'T'},
{"expected_address", required_argument, 0, 'a'},
{0, 0, 0, 0}
};
if (argc < 2)
return ERROR;
while (1) {
c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:a:", longopts, &option);
if (c == -1 || c == EOF)
break;
switch (c) {
case '?': /* help */
usage2 (_("Unknown argument"), optarg);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'V': /* version */
print_revision (progname, revision);
exit (STATE_OK);
case 'H': /* hostname */
if (is_host (optarg)) {
dns_server = optarg;
}
else {
usage2 (_("Invalid hostname/address"), optarg);
}
break;
case 'p': /* server port */
if (is_intpos (optarg)) {
server_port = atoi (optarg);
}
else {
usage2 (_("Port must be a positive integer"), optarg);
}
break;
case 'l': /* address to lookup */
query_address = optarg;
break;
case 'w': /* warning */
if (is_nonnegative (optarg)) {
warning_interval = strtod (optarg, NULL);
}
else {
usage2 (_("Warning interval must be a positive integer"), optarg);
}
break;
case 'c': /* critical */
if (is_nonnegative (optarg)) {
critical_interval = strtod (optarg, NULL);
}
else {
usage2 (_("Critical interval must be a positive integer"), optarg);
}
break;
case 't': /* timeout */
if (is_intnonneg (optarg)) {
timeout_interval = atoi (optarg);
}
else {
usage2 (_("Timeout interval must be a positive integer"), optarg);
}
break;
case 'v': /* verbose */
verbose = TRUE;
break;
case 'T':
record_type = optarg;
break;
case 'a':
expected_address = optarg;
break;
}
}
c = optind;
if (dns_server == NULL) {
if (c < argc) {
if (is_host (argv[c])) {
dns_server = argv[c];
}
else {
usage2 (_("Invalid hostname/address"), argv[c]);
}
}
else {
dns_server = strdup ("127.0.0.1");
}
}
return validate_arguments ();
}
int
validate_arguments (void)
{
return OK;
}
void
print_help (void)
{
char *myport;
asprintf (&myport, "%d", DEFAULT_PORT);
print_revision (progname, revision);
printf ("Copyright (c) 2000 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
printf (COPYRIGHT, copyright, email);
printf (_("Test the DNS service on the specified host using dig\n\n"));
print_usage ();
printf (_(UT_HELP_VRSN));
printf (_(UT_HOST_PORT), 'P', myport);
printf (_("\
-l, --lookup=STRING\n\
machine name to lookup\n"));
printf (_("\
-T, --record_type=STRING\n\
record type to lookup (default: A)\n"));
printf (_("\
-a, --expected_address=STRING\n\
an address expected to be in the answer section.\n\
if not set, uses whatever was in -l\n"));
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 -l lookup [-p <server port>] [-T <query type>]\n\
[-w <warning interval>] [-c <critical interval>] [-t <timeout>]\n\
[-a <expected answer address>] [-v]\n", progname);
}
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