/******************************************************************************
*
* Nagios check_ldap plugin
*
* License: GPL
* Copyright (c) 2000-2006 nagios-plugins team
*
* Last Modified: $Date: 2006/10/22 22:24:27 $
*
* Description:
*
* This file contains the check_ldap plugin
*
* 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.

 $Id: check_ldap.c,v 1.33 2006/10/22 22:24:27 opensides Exp $
 
******************************************************************************/

/* progname may be check_ldaps */
char *progname = "check_ldap";
const char *revision = "$Revision: 1.33 $";
const char *copyright = "2000-2006";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "netutils.h"
#include "utils.h"

#include <lber.h>
#include <ldap.h>

enum {
	UNDEFINED = 0,
#ifdef HAVE_LDAP_SET_OPTION
	DEFAULT_PROTOCOL = 2,
#endif
	DEFAULT_PORT = 389
};

int process_arguments (int, char **);
int validate_arguments (void);
void print_help (void);
void print_usage (void);

char ld_defattr[] = "(objectclass=*)";
char *ld_attr = ld_defattr;
char *ld_host = NULL;
char *ld_base = NULL;
char *ld_passwd = NULL;
char *ld_binddn = NULL;
int ld_port = DEFAULT_PORT;
#ifdef HAVE_LDAP_SET_OPTION
int ld_protocol = DEFAULT_PROTOCOL;
#endif
double warn_time = UNDEFINED;
double crit_time = UNDEFINED;
struct timeval tv;

/* for ldap tls */

char *SERVICE = "LDAP";

int
main (int argc, char *argv[])
{

	LDAP *ld;
	LDAPMessage *result;

	/* should be 	int result = STATE_UNKNOWN; */
	
	int status = STATE_UNKNOWN;
	long microsec;
	double elapsed_time;
	
	/* for ldap tls */
	
 	int tls; 
 	int version=3;

	setlocale (LC_ALL, "");
	bindtextdomain (PACKAGE, LOCALEDIR);
	textdomain (PACKAGE);

	if (strstr(argv[0],"check_ldaps")) {
		asprintf (&progname, "check_ldaps");
 	}
	
	if (process_arguments (argc, argv) == ERROR)
		usage4 (_("Could not parse arguments"));

	/* initialize alarm signal handling */
	signal (SIGALRM, socket_timeout_alarm_handler);

	/* set socket timeout */
	alarm (socket_timeout);

	/* get the start time */
	gettimeofday (&tv, NULL);

	/* initialize ldap */
#ifdef HAVE_LDAP_INIT
	if (!(ld = ldap_init (ld_host, ld_port))) {
		printf ("Could not connect to the server at port %i\n", ld_port);
		return STATE_CRITICAL;
	}
#else	
	if (!(ld = ldap_open (ld_host, ld_port))) {
		/*ldap_perror(ld, "ldap_open"); */
		printf (_("Could not connect to the server at port %i\n"), ld_port);
		return STATE_CRITICAL;
	}
#endif /* HAVE_LDAP_INIT */
	
#ifdef HAVE_LDAP_SET_OPTION
	/* set ldap options */
	if (ldap_set_option (ld, LDAP_OPT_PROTOCOL_VERSION, &ld_protocol) !=
			LDAP_OPT_SUCCESS ) {
		printf(_("Could not set protocol version %d\n"), ld_protocol);
		return STATE_CRITICAL;
	}
#endif

	if (strstr(argv[0],"check_ldaps")) {
	/* with TLS */
		if ( ld_port == LDAPS_PORT ) {
 			asprintf (&SERVICE, "LDAPS");
#if defined(HAVE_LDAP_SET_OPTION) && defined(LDAP_OPT_X_TLS)
 			/* ldaps: set option tls */
 			tls = LDAP_OPT_X_TLS_HARD;
			
 			if (ldap_set_option (ld, LDAP_OPT_X_TLS, &tls) != LDAP_SUCCESS)
 			{
 				/*ldap_perror(ld, "ldaps_option"); */
 				printf (_("Could not init TLS at port %i!\n"), ld_port);
				return STATE_CRITICAL;
   		}
#else
			printf (_("TLS not supported by the libraries!\n"), ld_port);
			return STATE_CRITICAL;
#endif /* LDAP_OPT_X_TLS */
		} else {
			asprintf (&SERVICE, "LDAP-TLS");
#if defined(HAVE_LDAP_SET_OPTION) && defined(HAVE_LDAP_START_TLS_S)
			/* ldap with startTLS: set option version */
			if (ldap_get_option(ld,LDAP_OPT_PROTOCOL_VERSION, &version) == LDAP_OPT_SUCCESS )
			{
				if (version < LDAP_VERSION3)
				{
					version = LDAP_VERSION3;
					ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &version);
				}
			}
			/* call start_tls */
			if (ldap_start_tls_s(ld, NULL, NULL) != LDAP_SUCCESS)
			{
				/*ldap_perror(ld, "ldap_start_tls"); */
				printf (_("Could not init startTLS at port %i!\n"), ld_port);
				return STATE_CRITICAL;
			}
#else
			printf (_("startTLS not supported by the library, needs LDAPv3!\n"));
			return STATE_CRITICAL;
#endif /* HAVE_LDAP_START_TLS_S */
		}
	}
	
	/* bind to the ldap server */
	if (ldap_bind_s (ld, ld_binddn, ld_passwd, LDAP_AUTH_SIMPLE) !=
			LDAP_SUCCESS) {
		/*ldap_perror(ld, "ldap_bind"); */
		printf (_("Could not bind to the ldap-server\n"));
		return STATE_CRITICAL;
	}

	/* do a search of all objectclasses in the base dn */
	if (ldap_search_s (ld, ld_base, LDAP_SCOPE_BASE, ld_attr, NULL, 0, &result)
			!= LDAP_SUCCESS) {
		/*ldap_perror(ld, "ldap_search"); */
		printf (_("Could not search/find objectclasses in %s\n"), ld_base);
		return STATE_CRITICAL;
	}

	/* unbind from the ldap server */
	ldap_unbind (ld);

	/* reset the alarm handler */
	alarm (0);

	/* calcutate the elapsed time and compare to thresholds */

	microsec = deltime (tv);
	elapsed_time = (double)microsec / 1.0e6;

	if (crit_time!=UNDEFINED && elapsed_time>crit_time)
		status = STATE_CRITICAL;
	else if (warn_time!=UNDEFINED && elapsed_time>warn_time)
		status = STATE_WARNING;
	else
		status = STATE_OK;

	/* print out the result */
	printf (_("LDAP %s - %.3f seconds response time|%s\n"),
	        state_text (status),
	        elapsed_time,
	        fperfdata ("time", elapsed_time, "s",
	                  (int)warn_time, warn_time,
	                  (int)crit_time, crit_time,
	                  TRUE, 0, FALSE, 0));

	return status;
}

/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
	int c;

	int option = 0;
	/* initialize the long option struct */
	static struct option longopts[] = {
		{"help", no_argument, 0, 'h'},
		{"version", no_argument, 0, 'V'},
		{"timeout", required_argument, 0, 't'},
		{"host", required_argument, 0, 'H'},
		{"base", required_argument, 0, 'b'},
		{"attr", required_argument, 0, 'a'},
		{"bind", required_argument, 0, 'D'},
		{"pass", required_argument, 0, 'P'},
#ifdef HAVE_LDAP_SET_OPTION
		{"ver2", no_argument, 0, '2'},
		{"ver3", no_argument, 0, '3'},
#endif
		{"use-ipv4", no_argument, 0, '4'},
		{"use-ipv6", no_argument, 0, '6'},
		{"port", required_argument, 0, 'p'},
		{"warn", required_argument, 0, 'w'},
		{"crit", required_argument, 0, 'c'},
		{0, 0, 0, 0}
	};

	if (argc < 2)
		return ERROR;

	for (c = 1; c < argc; c++) {
		if (strcmp ("-to", argv[c]) == 0)
			strcpy (argv[c], "-t");
	}

	while (1) {
		c = getopt_long (argc, argv, "hV2346t:c:w:H:b:p:a:D:P:", longopts, &option);

		if (c == -1 || c == EOF)
			break;

		switch (c) {
		case 'h':									/* help */
			print_help ();
			exit (STATE_OK);
		case 'V':									/* version */
			print_revision (progname, revision);
			exit (STATE_OK);
		case 't':									/* timeout period */
			if (!is_intnonneg (optarg))
				usage2 (_("Timeout interval must be a positive integer"), optarg);
			else
				socket_timeout = atoi (optarg);
			break;
		case 'H':
			ld_host = optarg;
			break;
		case 'b':
			ld_base = optarg;
			break;
		case 'p':
			ld_port = atoi (optarg);
			break;
		case 'a':
			ld_attr = optarg;
			break;
		case 'D':
			ld_binddn = optarg;
			break;
		case 'P':
			ld_passwd = optarg;
			break;
		case 'w':
			warn_time = strtod (optarg, NULL);
			break;
		case 'c':
			crit_time = strtod (optarg, NULL);
			break;
#ifdef HAVE_LDAP_SET_OPTION
		case '2':
			ld_protocol = 2;
			break;
		case '3':
			ld_protocol = 3;
			break;
#endif
		case '4':
			address_family = AF_INET;
			break;
		case '6':
#ifdef USE_IPV6
			address_family = AF_INET6;
#else
			usage (_("IPv6 support not available\n"));
#endif
			break;
		default:
			usage2 (_("Unknown argument"), optarg);
		}
	}

	c = optind;
	if (ld_host == NULL && is_host(argv[c]))
		ld_host = strdup (argv[c++]);

	if (ld_base == NULL && argv[c])
		ld_base = strdup (argv[c++]);

	return validate_arguments ();
}


int
validate_arguments ()
{
	if (ld_host==NULL || strlen(ld_host)==0)
		usage4 (_("Please specify the host name\n"));

	if (ld_base==NULL || strlen(ld_base)==0)
		usage4 (_("Please specify the LDAP base\n"));

	return OK;
}


void
print_help (void)
{
	char *myport;
	asprintf (&myport, "%d", DEFAULT_PORT);

	print_revision (progname, revision);

	printf ("Copyright (c) 1999 Didi Rieder (adrieder@sbox.tu-graz.ac.at)\n");
	printf (COPYRIGHT, copyright, email);

  printf ("\n\n");
  
	print_usage ();

	printf (_(UT_HELP_VRSN));

	printf (_(UT_HOST_PORT), 'p', myport);

	printf (_(UT_IPv46));

	printf (" %s\n", "-a [--attr]");
  printf ("    %s\n", _("ldap attribute to search (default: \"(objectclass=*)\""));
  printf (" %s\n", "-b [--base]");
  printf ("    %s\n", _("ldap base (eg. ou=my unit, o=my org, c=at"));
  printf (" %s\n," "-D [--bind]");
  printf ("    %s\n", _("ldap bind DN (if required)"));
  printf (" %s\n," "-P [--pass]");
  printf ("    %s\n", _("ldap password (if required)"));

#ifdef HAVE_LDAP_SET_OPTION
	printf (" %s\n", "-2 [--ver2]");
  printf ("    %s\n", _("use ldap protocol version 2"));
  printf (" %s\n", "-3 [--ver3]");
  printf ("    %s\n", _("use ldap protocol version 3"));
  printf ("(default protocol version: %d)", DEFAULT_PROTOCOL);
#endif

	printf (_(UT_WARN_CRIT));

	printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);

	printf (_(UT_VERBOSE));

	printf (_(UT_SUPPORT));
}

/* todo
* add option -4 and -6 to the long manual
*
*/

void
print_usage (void)
{
  printf (_("Usage:"));
	printf (" %s -H <host> -b <base_dn> [-p <port>] [-a <attr>] [-D <binddn>]",progname);
  printf ("[-P <password>] [-w <warn_time>] [-c <crit_time>] [-t timeout]\n",
#ifdef HAVE_LDAP_SET_OPTION
			" [-2|-3] [-4|-6]"
#else
			""
#endif
			);
}