X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=plugins%2Fcheck_dns.c;h=94d4300c85e5f54c004120549a62b3f21562813f;hb=187f86275426bfb501c7180c48161e1e22af1ef7;hp=7c79893ab7dc4b6ea0d008911254a480160bd7e9;hpb=7283211f00a3a89956d9dfc4a851dc1aaa7a1cf3;p=nagiosplug.git

diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index 7c79893..94d4300 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -1,62 +1,41 @@
 /******************************************************************************
- *
- * CHECK_DNS.C
- *
- * Program: DNS plugin for Nagios
- * License: GPL
- * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
- *
- * Last Modified: $Date$
- *
- * Notes:
- *  - Safe popen added by Karl DeBisschop 9-11-99
- *  - expected-address parameter added by Alex Chaffee - 7 Oct 2002
- *
- * Command line: (see print_usage)
- *
- * Description:
- *
- * This program will use the nslookup program to obtain the IP address
- * for a given host name.  A optional DNS server may be specified.  If
- * no DNS server is specified, the default server(s) for the system
- * are used.
- *
- * Return Values:
- *  OK           The DNS query was successful (host IP address was returned).
- *  WARNING      The DNS server responded, but could not fulfill the request.
- *  CRITICAL     The DNS server is not responding or encountered an error.
- *
- * License Information:
- *
- * 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.
- *
- *****************************************************************************/
+
+ 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.
+
+ LIMITATION: nslookup on Solaris 7 can return output over 2 lines, which will not 
+ be picked up by this plugin
+ 
+ $Id$
+
+******************************************************************************/
+
+const char *progname = "check_dns";
+const char *revision = "$Revision$";
+const char *copyright = "2000-2004";
+const char *email = "nagiosplug-devel@lists.sourceforge.net";
 
 #include "common.h"
 #include "popen.h"
 #include "utils.h"
-
-const char *progname = "check_dns";
-#define REVISION "$Revision$"
-#define COPYRIGHT "2000-2002"
+#include "netutils.h"
 
 int process_arguments (int, char **);
 int validate_arguments (void);
-void print_usage (void);
-void print_help (void);
 int error_scan (char *);
+void print_help (void);
+void print_usage (void);
 
 #define ADDRESS_LENGTH 256
 char query_address[ADDRESS_LENGTH] = "";
@@ -65,6 +44,7 @@ char ptr_server[ADDRESS_LENGTH] = "";
 int verbose = FALSE;
 char expected_address[ADDRESS_LENGTH] = "";
 int match_expected_address = FALSE;
+int expect_authority = FALSE;
 
 int
 main (int argc, char **argv)
@@ -74,83 +54,95 @@ main (int argc, char **argv)
 	char *output = NULL;
 	char *address = NULL;
 	char *temp_buffer = NULL;
+	int non_authoritative = FALSE;
 	int result = STATE_UNKNOWN;
+	double elapsed_time;
+	long microsec;
+	struct timeval tv;
+	int multi_address;
+	int parse_address = FALSE; /* This flag scans for Address: but only after Name: */
+
+	setlocale (LC_ALL, "");
+	bindtextdomain (PACKAGE, LOCALEDIR);
+	textdomain (PACKAGE);
 
 	/* Set signal handling and alarm */
 	if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR) {
-		printf ("Cannot catch SIGALRM");
-		return STATE_UNKNOWN;
+		usage4 (_("Cannot catch SIGALRM"));
 	}
 
-	if (process_arguments (argc, argv) != OK) {
-		print_usage ();
-		return STATE_UNKNOWN;
+	if (process_arguments (argc, argv) == ERROR) {
+		usage4 (_("Could not parse arguments"));
 	}
 
 	/* get the command to run */
-	asprintf (&command_line, "%s %s %s", NSLOOKUP_COMMAND,	query_address, dns_server);
+	asprintf (&command_line, "%s %s %s", NSLOOKUP_COMMAND, query_address, dns_server);
 
 	alarm (timeout_interval);
-	time (&start_time);
+	gettimeofday (&tv, NULL);
 
 	if (verbose)
 		printf ("%s\n", command_line);
+
 	/* run the command */
 	child_process = spopen (command_line);
 	if (child_process == NULL) {
-		printf ("Could not open pipe: %s\n", command_line);
+		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);
+		printf (_("Could not open stderr for %s\n"), command_line);
 
 	/* scan stdout */
 	while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
 
 		if (verbose)
-			printf ("%s\n", input_buffer);
+			printf ("%s", input_buffer);
 
 		if (strstr (input_buffer, ".in-addr.arpa")) {
 			if ((temp_buffer = strstr (input_buffer, "name = ")))
-				address = strscpy (address, temp_buffer + 7);
+				address = strdup (temp_buffer + 7);
 			else {
-				output = strscpy (output, "Unknown error (plugin)");
+				output = strdup (_("Warning plugin error"));
 				result = STATE_WARNING;
 			}
 		}
 
 		/* the server is responding, we just got the host name... */
-		if (strstr (input_buffer, "Name:")) {
-
-			/* get the host address */
-			if (!fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
-				break;
-
-			if (verbose)
-				printf ("%s\n", input_buffer);
-
-			if ((temp_buffer = index (input_buffer, ':'))) {
-				temp_buffer++;
-				/* Strip leading spaces */
-				for (; *temp_buffer != '\0' && *temp_buffer == ' '; temp_buffer++)
-					/* NOOP */;
-				address = strscpy (address, temp_buffer);
-				strip (address);
-				result = STATE_OK;
-			}
-			else {
-				output = strscpy (output, "Unknown error (plugin)");
-				result = STATE_WARNING;
+		if (strstr (input_buffer, "Name:"))
+			parse_address = TRUE;
+		else if (parse_address == TRUE && (strstr (input_buffer, "Address:") ||
+		         strstr (input_buffer, "Addresses:"))) {
+			temp_buffer = index (input_buffer, ':');
+			temp_buffer++;
+
+			/* Strip leading spaces */
+			for (; *temp_buffer != '\0' && *temp_buffer == ' '; temp_buffer++)
+				/* NOOP */;
+			
+			strip(temp_buffer);
+			if (temp_buffer==NULL || strlen(temp_buffer)==0) {
+				die (STATE_CRITICAL,
+				     _("DNS CRITICAL - '%s' returned empty host name string\n"),
+				     NSLOOKUP_COMMAND);
 			}
 
-			break;
+			if (address == NULL)
+				address = strdup (temp_buffer);
+			else
+				asprintf(&address, "%s,%s", address, temp_buffer);
+		}
+
+		else if (strstr (input_buffer, _("Non-authoritative answer:"))) {
+			non_authoritative = TRUE;
 		}
 
 		result = error_scan (input_buffer);
 		if (result != STATE_OK) {
-			output = strscpy (output, 1 + index (input_buffer, ':'));
+			output = strdup (1 + index (input_buffer, ':'));
+			strip (output);
 			break;
 		}
 
@@ -158,9 +150,14 @@ main (int argc, char **argv)
 
 	/* scan stderr */
 	while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
+
+		if (verbose)
+			printf ("%s", input_buffer);
+
 		if (error_scan (input_buffer) != STATE_OK) {
 			result = max_state (result, error_scan (input_buffer));
-			output = strscpy (output, 1 + index (input_buffer, ':'));
+			output = strdup (1 + index (input_buffer, ':'));
+			strip (output);
 		}
 	}
 
@@ -170,92 +167,116 @@ main (int argc, char **argv)
 	/* close stdout */
 	if (spclose (child_process)) {
 		result = max_state (result, STATE_WARNING);
-		if (!strcmp (output, ""))
-			output = strscpy (output, "nslookup returned error status");
+		if (output == NULL || !strcmp (output, ""))
+			output = strdup (_("nslookup returned error status"));
 	}
 
+	/* If we got here, we should have an address string, 
+		 and we can segfault if we do not */
+	if (address==NULL || strlen(address)==0)
+		die (STATE_CRITICAL,
+		     _("DNS CRITICAL - '%s' output parsing exited with no address\n"),
+		     NSLOOKUP_COMMAND);
+
 	/* compare to expected address */
 	if (result == STATE_OK && match_expected_address && strcmp(address, expected_address)) {
-	        result = STATE_CRITICAL;
-	        asprintf(&output, "expected %s but got %s", expected_address, address);
-		}
-	
-	(void) time (&end_time);
+		result = STATE_CRITICAL;
+		asprintf(&output, _("expected %s but got %s"), expected_address, address);
+	}
+
+	/* check if authoritative */
+	if (result == STATE_OK && expect_authority && non_authoritative) {
+		result = STATE_CRITICAL;
+		asprintf(&output, _("server %s is not authoritative for %s"), dns_server, query_address);
+	}
+
+	microsec = deltime (tv);
+	elapsed_time = (double)microsec / 1.0e6;
 
-	if (result == STATE_OK)
-		printf ("DNS ok - %d seconds response time, Address(es) is/are %s\n",
-						(int) (end_time - start_time), address);
+	if (result == STATE_OK) {
+		if (strchr (address, ',') == NULL)
+			multi_address = FALSE;
+		else
+			multi_address = TRUE;
+
+		printf ("DNS %s: ", _("OK"));
+		printf (ngettext("%.3f second response time ", "%.3f seconds response time ", elapsed_time), elapsed_time);
+		printf (_("%s returns %s"), query_address, address);
+		printf ("|%s\n", fperfdata ("time", elapsed_time, "s", FALSE, 0, FALSE, 0, TRUE, 0, FALSE, 0));
+	}
 	else if (result == STATE_WARNING)
-		printf ("DNS WARNING - %s\n",
-			!strcmp (output, "") ? " Probably a non-existent host/domain" : output);
+		printf (_("DNS WARNING - %s\n"),
+		        !strcmp (output, "") ? _(" Probably a non-existent host/domain") : output);
 	else if (result == STATE_CRITICAL)
-		printf ("DNS CRITICAL - %s\n",
-			!strcmp (output, "") ? " Probably a non-existent host/domain" : output);
+		printf (_("DNS CRITICAL - %s\n"),
+		        !strcmp (output, "") ? _(" Probably a non-existent host/domain") : output);
 	else
-		printf ("DNS problem - %s\n",
-			!strcmp (output, "") ? " Probably a non-existent host/domain" : output);
+		printf (_("DNS UNKNOW - %s\n"),
+		        !strcmp (output, "") ? _(" Probably a non-existent host/domain") : output);
 
 	return result;
 }
 
+
+
 int
 error_scan (char *input_buffer)
 {
 
 	/* the DNS lookup timed out */
-	if (strstr (input_buffer,
-	     "Note:  nslookup is deprecated and may be removed from future releases.")
-	    || strstr (input_buffer,
-	     "Consider using the `dig' or `host' programs instead.  Run nslookup with")
-	    || strstr (input_buffer,
-	     "the `-sil[ent]' option to prevent this message from appearing."))
+	if (strstr (input_buffer, _("Note: nslookup is deprecated and may be removed from future releases.")) ||
+	    strstr (input_buffer, _("Consider using the `dig' or `host' programs instead.  Run nslookup with")) ||
+	    strstr (input_buffer, _("the `-sil[ent]' option to prevent this message from appearing.")))
 		return STATE_OK;
 
-	/* the DNS lookup timed out */
-	else if (strstr (input_buffer, "Timed out"))
-		return STATE_WARNING;
-
 	/* DNS server is not running... */
 	else if (strstr (input_buffer, "No response from server"))
-		return STATE_CRITICAL;
+		die (STATE_CRITICAL, _("No response from DNS %s\n"), dns_server);
 
 	/* Host name is valid, but server doesn't have records... */
 	else if (strstr (input_buffer, "No records"))
-		return STATE_WARNING;
-
-	/* Host or domain name does not exist */
-	else if (strstr (input_buffer, "Non-existent"))
-		return STATE_CRITICAL;
-	else if (strstr (input_buffer, "** server can't find"))
-		return STATE_CRITICAL;
-	else if(strstr(input_buffer,"NXDOMAIN")) /* 9.x */
-		return STATE_CRITICAL;
+		die (STATE_CRITICAL, _("DNS %s has no records\n"), dns_server);
 
 	/* Connection was refused */
-	else if (strstr (input_buffer, "Connection refused"))
-		return STATE_CRITICAL;
+	else if (strstr (input_buffer, "Connection refused") ||
+		 strstr (input_buffer, "Couldn't find server") ||
+	         strstr (input_buffer, "Refused") ||
+	         (strstr (input_buffer, "** server can't find") &&
+	          strstr (input_buffer, ": REFUSED")))
+		die (STATE_CRITICAL, _("Connection to DNS %s was refused\n"), dns_server);
+
+	/* Query refused (usually by an ACL in the namserver) */ 
+	else if (strstr (input_buffer, "Query refused"))
+		die (STATE_CRITICAL, _("Query was refused by DNS server at %s\n"), dns_server);
+
+	/* No information (e.g. nameserver IP has two PTR records) */
+	else if (strstr (input_buffer, "No information"))
+		die (STATE_CRITICAL, _("No information returned by DNS server at %s\n"), dns_server);
+
+	/* Host or domain name does not exist */
+	else if (strstr (input_buffer, "Non-existent") ||
+	         strstr (input_buffer, "** server can't find") ||
+		 strstr (input_buffer,"NXDOMAIN"))
+		die (STATE_CRITICAL, _("Domain %s was not found by the server\n"), query_address);
 
 	/* Network is unreachable */
 	else if (strstr (input_buffer, "Network is unreachable"))
-		return STATE_CRITICAL;
+		die (STATE_CRITICAL, _("Network is unreachable\n"));
 
 	/* Internal server failure */
 	else if (strstr (input_buffer, "Server failure"))
-		return STATE_CRITICAL;
-
-	/* DNS server refused to service request */
-	else if (strstr (input_buffer, "Refused"))
-		return STATE_CRITICAL;
+		die (STATE_CRITICAL, _("DNS failure for %s\n"), dns_server);
 
-	/* Request error */
-	else if (strstr (input_buffer, "Format error"))
+	/* Request error or the DNS lookup timed out */
+	else if (strstr (input_buffer, "Format error") ||
+	         strstr (input_buffer, "Timed out"))
 		return STATE_WARNING;
 
-	else
-		return STATE_OK;
+	return STATE_OK;
 
 }
 
+
 /* process command-line arguments */
 int
 process_arguments (int argc, char **argv)
@@ -272,6 +293,7 @@ process_arguments (int argc, char **argv)
 		{"server", required_argument, 0, 's'},
 		{"reverse-server", required_argument, 0, 'r'},
 		{"expected-address", required_argument, 0, 'a'},
+		{"expect-authority", no_argument, 0, 'A'},
 		{0, 0, 0, 0}
 	};
 
@@ -283,21 +305,19 @@ process_arguments (int argc, char **argv)
 			strcpy (argv[c], "-t");
 
 	while (1) {
-		c = getopt_long (argc, argv, "hVvt:H:s:r:a:", long_opts, &opt_index);
+		c = getopt_long (argc, argv, "hVvAt:H:s:r:a:", long_opts, &opt_index);
 
 		if (c == -1 || c == EOF)
 			break;
 
 		switch (c) {
 		case '?': /* args not parsable */
-			printf ("%s: Unknown argument: %s\n\n", progname, optarg);
-			print_usage ();
-			exit (STATE_UNKNOWN);
+			usage2 (_("Unknown argument"), optarg);
 		case 'h': /* help */
 			print_help ();
 			exit (STATE_OK);
 		case 'V': /* version */
-			print_revision (progname, REVISION);
+			print_revision (progname, revision);
 			exit (STATE_OK);
 		case 'v': /* version */
 			verbose = TRUE;
@@ -306,73 +326,63 @@ process_arguments (int argc, char **argv)
 			timeout_interval = atoi (optarg);
 			break;
 		case 'H': /* hostname */
-			if (is_host (optarg) == FALSE) {
-				printf ("Invalid host name/address\n\n");
-				print_usage ();
-				exit (STATE_UNKNOWN);
-			}
 			if (strlen (optarg) >= ADDRESS_LENGTH)
-				terminate (STATE_UNKNOWN, "Input buffer overflow\n");
+				die (STATE_UNKNOWN, _("Input buffer overflow\n"));
 			strcpy (query_address, optarg);
 			break;
 		case 's': /* server name */
+			/* TODO: this is_host check is probably unnecessary. */
+			/* Better to confirm nslookup response matches */
 			if (is_host (optarg) == FALSE) {
-				printf ("Invalid server name/address\n\n");
-				print_usage ();
-				exit (STATE_UNKNOWN);
+				usage2 (_("Invalid hostname/address"), optarg);
 			}
 			if (strlen (optarg) >= ADDRESS_LENGTH)
-				terminate (STATE_UNKNOWN, "Input buffer overflow\n");
+				die (STATE_UNKNOWN, _("Input buffer overflow\n"));
 			strcpy (dns_server, optarg);
 			break;
 		case 'r': /* reverse server name */
+			/* TODO: Is this is_host necessary? */
 			if (is_host (optarg) == FALSE) {
-				printf ("Invalid host name/address\n\n");
-				print_usage ();
-				exit (STATE_UNKNOWN);
+				usage2 (_("Invalid hostname/address"), optarg);
 			}
 			if (strlen (optarg) >= ADDRESS_LENGTH)
-				terminate (STATE_UNKNOWN, "Input buffer overflow\n");
+				die (STATE_UNKNOWN, _("Input buffer overflow\n"));
 			strcpy (ptr_server, optarg);
 			break;
 		case 'a': /* expected address */
-			if (is_addr (optarg) == FALSE) {
-				printf ("Invalid expected address\n\n");
-				print_usage ();
-				exit (STATE_UNKNOWN);
-			}
 			if (strlen (optarg) >= ADDRESS_LENGTH)
-				terminate (STATE_UNKNOWN, "Input buffer overflow\n");
+				die (STATE_UNKNOWN, _("Input buffer overflow\n"));
 			strcpy (expected_address, optarg);
 			match_expected_address = TRUE;
 			break;
+		case 'A': /* expect authority */
+			expect_authority = TRUE;
+			break;
 		}
 	}
 
 	c = optind;
 	if (strlen(query_address)==0 && c<argc) {
-		if (is_host(argv[c])==FALSE) {
-			printf ("Invalid name/address: %s\n\n", argv[c]);
-			return ERROR;
-		}
 		if (strlen(argv[c])>=ADDRESS_LENGTH)
-			terminate (STATE_UNKNOWN, "Input buffer overflow\n");
+			die (STATE_UNKNOWN, _("Input buffer overflow\n"));
 		strcpy (query_address, argv[c++]);
 	}
 
 	if (strlen(dns_server)==0 && c<argc) {
+		/* TODO: See -s option */
 		if (is_host(argv[c]) == FALSE) {
-			printf ("Invalid name/address: %s\n\n", argv[c]);
+			printf (_("Invalid hostname/address: %s\n\n"), argv[c]);
 			return ERROR;
 		}
 		if (strlen(argv[c]) >= ADDRESS_LENGTH)
-			terminate (STATE_UNKNOWN, "Input buffer overflow\n");
+			die (STATE_UNKNOWN, _("Input buffer overflow\n"));
 		strcpy (dns_server, argv[c++]);
 	}
 
 	return validate_arguments ();
 }
 
+
 int
 validate_arguments ()
 {
@@ -382,36 +392,44 @@ validate_arguments ()
 		return OK;
 }
 
+
 void
-print_usage (void)
+print_help (void)
 {
-	printf ("Usage: %s -H host [-s server] [-a expected-address] [-t timeout]\n" "       %s --help\n"
-					"       %s --version\n", progname, progname, progname);
+	print_revision (progname, revision);
+
+	printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
+	printf (COPYRIGHT, copyright, email);
+
+	printf (_("\
+This plugin uses the nslookup program to obtain the IP address\n\
+for the given host/domain query.  A optional DNS server to use may\n\
+be specified.  If no DNS server is specified, the default server(s)\n\
+specified in /etc/resolv.conf will be used.\n\n"));
+
+	print_usage ();
+
+	printf (_(UT_HELP_VRSN));
+
+	printf (_("\
+-H, --hostname=HOST\n\
+   The name or address you want to query\n\
+-s, --server=HOST\n\
+   Optional DNS server you want to use for the lookup\n\
+-a, --expected-address=IP-ADDRESS\n\
+   Optional IP address you expect the DNS server to return\n\
+-A, --expect-authority\n\
+   Optionally expect the DNS server to be authoritative for the lookup\n"));
+
+	printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
+
+	printf (_(UT_SUPPORT));
 }
 
+
 void
-print_help (void)
+print_usage (void)
 {
-	print_revision (progname, REVISION);
-	printf ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n");
-	print_usage ();
-	printf
-		("\nOptions:\n"
-		 "-H, --hostname=HOST\n"
-		 "   The name or address you want to query\n"
-		 "-s, --server=HOST\n"
-		 "   Optional DNS server you want to use for the lookup\n"
-		 "-a, --expected-address=IP-ADDRESS\n"
-		 "   Optional IP address you expect the DNS server to return\n"
-		 "-t, --timeout=INTEGER\n"
-		 "   Seconds before connection times out (default: %d)\n"
-		 "-h, --help\n"
-		 "   Print detailed help\n"
-		 "-V, --version\n"
-		 "   Print version numbers and license information\n"
-		 "\n"
-		 "This plugin uses the nslookup program to obtain the IP address\n"
-		 "for the given host/domain query.  A optional DNS server to use may\n"
-		 "be specified.  If no DNS server is specified, the default server(s)\n"
-		 "specified in /etc/resolv.conf will be used.\n", DEFAULT_SOCKET_TIMEOUT);
+	printf ("\
+Usage: %s -H host [-s server] [-a expected-address] [-A] [-t timeout]\n", progname);
 }