/******************************************************************************
 *
 * CHECK_NT.C
 *
 * Program: Windows NT plugin for NetSaint
 * License: GPL
 * Copyright (c) 2000-2002 Yves Rubin (rubiyz@yahoo.com)
 *
 * Description:
 * 
 * This requires NSClient software to run on NT (http://nsclient.ready2run.nl/)
 *
 * 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.
 *
 *****************************************************************************/

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

enum checkvars {
	CHECK_NONE,
	CHECK_CLIENTVERSION,
	CHECK_CPULOAD,
	CHECK_UPTIME,
	CHECK_USEDDISKSPACE,
	CHECK_SERVICESTATE,
	CHECK_PROCSTATE,
	CHECK_MEMUSE,
	CHECK_COUNTER,
	CHECK_FILEAGE
};

enum {
	MAX_VALUE_LIST = 30,
	PORT = 1248
};

char *server_address=NULL;
char *volume_name=NULL;
int server_port=PORT;
char *value_list=NULL;
char *req_password=NULL;
unsigned long lvalue_list[MAX_VALUE_LIST];
unsigned long warning_value=0L;
unsigned long critical_value=0L;
int check_value_list=FALSE;
int check_warning_value=FALSE;
int check_critical_value=FALSE;
enum checkvars vars_to_check = CHECK_NONE;
int show_all=FALSE;

const char *progname = "check_nt";

char recv_buffer[MAX_INPUT_BUFFER];

void fetch_data (const char* address, int port, const char* sendb);
int process_arguments(int, char **);
void preparelist(char *string);
int strtoularray(unsigned long *array, char *string, const char *delim);
void print_help(void);
void print_usage(void);

int main(int argc, char **argv){
	int return_code = STATE_UNKNOWN;
	char *send_buffer=NULL;
	char *output_message=NULL;
	char *temp_string=NULL;
	char *description=NULL;

	double total_disk_space=0;
	double free_disk_space=0;
	double percent_used_space=0;
	double mem_commitLimit=0;
	double mem_commitByte=0;
	unsigned long utilization;
	unsigned long uptime;
	unsigned long age_in_minutes;
	double counter_value;
	int offset=0;
	int updays=0;
	int uphours=0;
	int upminutes=0;

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

	if(process_arguments(argc,argv)==ERROR)
		usage(_("Could not parse arguments\n"));

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

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

	switch (vars_to_check) {

	case CHECK_CLIENTVERSION:

		asprintf(&send_buffer, "%s&1", req_password);
		fetch_data (server_address, server_port, send_buffer);
		output_message = strdup (recv_buffer);
		return_code=STATE_OK;
		break;

	case CHECK_CPULOAD:

		if (value_list==NULL)
			output_message = strdup (_("missing -l parameters"));
		else if (strtoularray(lvalue_list,value_list,",")==FALSE)
			output_message = strdup (_("wrong -l parameter."));
		else {
			/* -l parameters is present with only integers */
			return_code=STATE_OK;
			temp_string = strdup (_("CPU Load"));
			/* loop until one of the parameters is wrong or not present */
			while (lvalue_list[0+offset]> (unsigned long)0 &&
						 lvalue_list[0+offset]<=(unsigned long)17280 && 
						 lvalue_list[1+offset]> (unsigned long)0 &&
						 lvalue_list[1+offset]<=(unsigned long)100 && 
						 lvalue_list[2+offset]> (unsigned long)0 &&
						 lvalue_list[2+offset]<=(unsigned long)100) {

				/* Send request and retrieve data */
				asprintf(&send_buffer,"%s&2&%lu",req_password,lvalue_list[0+offset]);
				fetch_data (server_address, server_port, send_buffer);

				utilization=strtoul(recv_buffer,NULL,10);
				
				/* Check if any of the request is in a warning or critical state */
				if(utilization >= lvalue_list[2+offset])
					return_code=STATE_CRITICAL;
				else if(utilization >= lvalue_list[1+offset] && return_code<STATE_WARNING)
					return_code=STATE_WARNING;

				asprintf(&output_message,_(" %lu%% (%lu min average)"), utilization, lvalue_list[0+offset]);
				asprintf(&temp_string,"%s%s",temp_string,output_message);
				offset+=3;	/* move across the array */
			}
			if (strlen(temp_string)>10)  /* we had at least one loop */
				output_message = strdup (temp_string);
			else
				output_message = strdup (_("not enough values for -l parameters"));
		}	
		break;

	case CHECK_UPTIME:

		asprintf(&send_buffer, "%s&3", req_password);
		fetch_data (server_address, server_port, send_buffer);
		uptime=strtoul(recv_buffer,NULL,10);
		updays = uptime / 86400; 			
		uphours = (uptime % 86400) / 3600;
		upminutes = ((uptime % 86400) % 3600) / 60;
		asprintf(&output_message,_("System Uptime : %u day(s) %u hour(s) %u minute(s)"),updays,uphours, upminutes);
		return_code=STATE_OK;
		break;

	case CHECK_USEDDISKSPACE:

		if (value_list==NULL)
			output_message = strdup (_("missing -l parameters"));
		else if (strlen(value_list)==1)
			output_message = strdup (_("wrong -l argument"));
		else {
			asprintf(&send_buffer,"%s&4&%s", req_password, value_list);
			fetch_data (server_address, server_port, send_buffer);
			free_disk_space=atof(strtok(recv_buffer,"&"));
			total_disk_space=atof(strtok(NULL,"&"));
			percent_used_space = ((total_disk_space - free_disk_space) / total_disk_space) * 100;

			if (free_disk_space>=0) {
				asprintf(&temp_string,_("%s:\\ - total: %.2f Gb - used: %.2f Gb (%.0f%%) - free %.2f Gb (%.0f%%)"),
								 value_list, total_disk_space / 1073741824, (total_disk_space - free_disk_space) / 1073741824, percent_used_space,
								 free_disk_space / 1073741824, (free_disk_space / total_disk_space)*100); 


				if(check_critical_value==TRUE && percent_used_space >= critical_value)
					return_code=STATE_CRITICAL;
				else if (check_warning_value==TRUE && percent_used_space >= warning_value)
					return_code=STATE_WARNING;	
				else
					return_code=STATE_OK;	

				output_message = strdup (temp_string);
			}
			else {
				output_message = strdup (_("Free disk space : Invalid drive "));
				return_code=STATE_UNKNOWN;
			}
		}
		break;

	case CHECK_SERVICESTATE:
	case CHECK_PROCSTATE:

		if (value_list==NULL)
			output_message = strdup (_("No service/process specified"));
		else {
			preparelist(value_list);		/* replace , between services with & to send the request */
			asprintf(&send_buffer,"%s&%u&%s&%s", req_password,(vars_to_check==CHECK_SERVICESTATE)?5:6,
							 (show_all==TRUE)?_("ShowAll"):_("ShowFail"),value_list);
			fetch_data (server_address, server_port, send_buffer);
			return_code=atoi(strtok(recv_buffer,"&"));
			temp_string=strtok(NULL,"&");
			output_message = strdup (temp_string);
		}
		break;

	case CHECK_MEMUSE:
		
		asprintf(&send_buffer,"%s&7", req_password);
		fetch_data (server_address, server_port, send_buffer);
		mem_commitLimit=atof(strtok(recv_buffer,"&"));
		mem_commitByte=atof(strtok(NULL,"&"));
		percent_used_space = (mem_commitByte / mem_commitLimit) * 100;
		asprintf(&output_message,_("Memory usage: total:%.2f Mb - used: %.2f Mb (%.0f%%) - free: %.2f Mb (%.0f%%)"), 
			mem_commitLimit / 1048576, mem_commitByte / 1048567, percent_used_space,  
			(mem_commitLimit - mem_commitByte) / 1048576, (mem_commitLimit - mem_commitByte) / mem_commitLimit * 100);
	
		if(check_critical_value==TRUE && percent_used_space >= critical_value)
			return_code=STATE_CRITICAL;
		else if (check_warning_value==TRUE && percent_used_space >= warning_value)
			return_code=STATE_WARNING;	
		else
			return_code=STATE_OK;	

		break;

	case CHECK_COUNTER:

		if (value_list==NULL)
			output_message = strdup (_("No counter specified"));
		else {
			preparelist(value_list);		/* replace , between services with & to send the request */
			asprintf(&send_buffer,"%s&8&%s", req_password,value_list);
			fetch_data (server_address, server_port, send_buffer);
			strtok(value_list,"&");			/* burn the first parameters */
			description = strtok(NULL,"&");
			counter_value = atof(recv_buffer);

			if (description == NULL) 
				asprintf(&output_message, "%.f", counter_value);
			else
				asprintf(&output_message,"%s = %.f",  description, counter_value);
	
			if (critical_value > warning_value) {        /* Normal thresholds */
				if(check_critical_value==TRUE && counter_value >= critical_value)
					return_code=STATE_CRITICAL;
				else if (check_warning_value==TRUE && counter_value >= warning_value)
					return_code=STATE_WARNING;	
				else
					return_code=STATE_OK;	
			} 
			else {                                       /* inverse thresholds */
				if(check_critical_value==TRUE && counter_value <= critical_value)
					return_code=STATE_CRITICAL;
				else if (check_warning_value==TRUE && counter_value <= warning_value)
					return_code=STATE_WARNING;	
				else
					return_code=STATE_OK;	
			}	
		}
		break;

	case CHECK_FILEAGE:

		if (value_list==NULL)
			output_message = strdup (_("No counter specified"));
		else {
			preparelist(value_list);		/* replace , between services with & to send the request */
			asprintf(&send_buffer,"%s&9&%s", req_password,value_list);
			fetch_data (server_address, server_port, send_buffer);
			age_in_minutes = atoi(strtok(recv_buffer,"&"));
			description = strtok(NULL,"&");
			output_message = strdup (description);
	
			if (critical_value > warning_value) {        /* Normal thresholds */
				if(check_critical_value==TRUE && age_in_minutes >= critical_value)
					return_code=STATE_CRITICAL;
				else if (check_warning_value==TRUE && age_in_minutes >= warning_value)
					return_code=STATE_WARNING;	
				else
					return_code=STATE_OK;	
			} 
			else {                                       /* inverse thresholds */
				if(check_critical_value==TRUE && age_in_minutes <= critical_value)
					return_code=STATE_CRITICAL;
				else if (check_warning_value==TRUE && age_in_minutes <= warning_value)
					return_code=STATE_WARNING;	
				else
					return_code=STATE_OK;	
			}
		}
		break;

	case CHECK_NONE:
	default:
		usage (_(""));
		break;

	}

	/* reset timeout */
	alarm(0);

	printf("%s\n",output_message);

	return return_code;
}





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

	int option = 0;
	static struct option longopts[] =
	{ 
		{"port",     required_argument,0,'p'},
		{"timeout",  required_argument,0,'t'},
		{"critical", required_argument,0,'c'},
		{"warning",  required_argument,0,'w'},
		{"variable", required_argument,0,'v'},
		{"hostname", required_argument,0,'H'},
		{"version",  no_argument,      0,'V'},
		{"help",     no_argument,      0,'h'},
		{0,0,0,0}
	};

	/* no options were supplied */
	if(argc<2) return ERROR;

	/* backwards compatibility */
	if (! is_option(argv[1])) {
		server_address = strdup(argv[1]);
		argv[1]=argv[0];
		argv=&argv[1];
		argc--;
	}

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

	while (1){
		c = getopt_long(argc,argv,"+hVH:t:c:w:p:v:l:s:d:",longopts,&option);

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

		switch (c)
			{
			case '?': /* print short usage statement if args not parsable */
				printf("%s: Unknown argument: %s\n\n",progname,optarg);
				print_usage();
				exit(STATE_UNKNOWN);
			case 'h': /* help */
				print_help();
				exit(STATE_OK);
			case 'V': /* version */
				print_revision(progname,"$Revision$");
				exit(STATE_OK);
			case 'H': /* hostname */
				if (server_address)	free(server_address);
				server_address = optarg;
				break;
			case 's': /* password */
				req_password = optarg;
				break;
			case 'p': /* port */
				if (is_intnonneg(optarg))
					server_port=atoi(optarg);
				else
					die(STATE_UNKNOWN,_("Server port an integer (seconds)\nType '%s -h' for additional help\n"),progname);
				break;
			case 'v':
				if(strlen(optarg)<4)
					return ERROR;
				if(!strcmp(optarg,"CLIENTVERSION"))
					vars_to_check=CHECK_CLIENTVERSION;
				else if(!strcmp(optarg,"CPULOAD"))
					vars_to_check=CHECK_CPULOAD;
				else if(!strcmp(optarg,"UPTIME"))
					vars_to_check=CHECK_UPTIME;
				else if(!strcmp(optarg,"USEDDISKSPACE"))
					vars_to_check=CHECK_USEDDISKSPACE;
				else if(!strcmp(optarg,"SERVICESTATE"))
					vars_to_check=CHECK_SERVICESTATE;
				else if(!strcmp(optarg,"PROCSTATE"))
					vars_to_check=CHECK_PROCSTATE;
				else if(!strcmp(optarg,"MEMUSE"))
					vars_to_check=CHECK_MEMUSE;
				else if(!strcmp(optarg,"COUNTER"))
					vars_to_check=CHECK_COUNTER;
				else if(!strcmp(optarg,"FILEAGE"))
					vars_to_check=CHECK_FILEAGE;
				else
					return ERROR;
				break;
			case 'l': /* value list */
				value_list = optarg;
				break;
			case 'w': /* warning threshold */
				warning_value=strtoul(optarg,NULL,10);
				check_warning_value=TRUE;
				break;
			case 'c': /* critical threshold */
				critical_value=strtoul(optarg,NULL,10);
				check_critical_value=TRUE;
				break;
			case 'd': /* Display select for services */
				if (!strcmp(optarg,"SHOWALL"))
					show_all = TRUE;
				break;
			case 't': /* timeout */
				socket_timeout=atoi(optarg);
				if(socket_timeout<=0)
					return ERROR;
			}

	}

	if (vars_to_check==CHECK_NONE)
		return ERROR;

	if (req_password == NULL)
		req_password = strdup (_("None"));

	return OK;
}






void fetch_data (const char *address, int port, const char *sendb) {
	int result;

	result=process_tcp_request(address, port, sendb, recv_buffer,sizeof(recv_buffer));

	if(result!=STATE_OK)
		die (result, "could not fetch information from server\n");
		
	if (!strncmp(recv_buffer,"ERROR",5))
		die (STATE_UNKNOWN, "NSClient - %s\n",recv_buffer);
}

int strtoularray(unsigned long *array, char *string, const char *delim) {
	/* split a <delim> delimited string into a long array */
	int idx=0;
	char *t1;

	for (idx=0;idx<MAX_VALUE_LIST;idx++)
		array[idx]=0;
	
	idx=0;
	for(t1 = strtok(string,delim);t1 != NULL; t1 = strtok(NULL, delim)) {
		if (is_numeric(t1) && idx<MAX_VALUE_LIST) {
			array[idx]=strtoul(t1,NULL,10);
			idx++;
		} else  
			return FALSE;
	}		
	return TRUE;
}

void preparelist(char *string) {
	/* Replace all , with & which is the delimiter for the request */
	int i;

	for (i = 0; (size_t)i < strlen(string); i++)
		if (string[i] == ',') {
			string[i]='&';
		}
}






void print_help(void)
{
	print_revision(progname,"$Revision$");
	printf (_("\
Copyright (c) 2000 Yves Rubin (rubiyz@yahoo.com)\n\n\
This plugin collects data from the NSClient service running on a\n\
Windows NT/2000/XP server.\n\n"));
	print_usage();
  printf (_("\nOptions:\n\
-H, --hostname=HOST\n\
  Name of the host to check\n\
-p, --port=INTEGER\n\
  Optional port number (default: %d)\n\
-s <password>\n\
  Password needed for the request\n\
-w, --warning=INTEGER\n\
  Threshold which will result in a warning status\n\
-c, --critical=INTEGER\n\
  Threshold which will result in a critical status\n\
-t, --timeout=INTEGER\n\
  Seconds before connection attempt times out (default: %d)\n\
-h, --help\n\
  Print this help screen\n\
-V, --version\n\
  Print version information\n"),
	        PORT, DEFAULT_SOCKET_TIMEOUT);
  printf (_("\
-v, --variable=STRING\n\
  Variable to check.  Valid variables are:\n"));
  printf (_("\
   CLIENTVERSION = Get the NSClient version\n"));
  printf (_("\
   CPULOAD = Average CPU load on last x minutes.\n\
     Request a -l parameter with the following syntax:\n\
     -l <minutes range>,<warning threshold>,<critical threshold>.\n\
     <minute range> should be less than 24*60.\n\
     Thresholds are percentage and up to 10 requests can be done in one shot.\n\
     ie: -l 60,90,95,120,90,95\n"));
  printf (_("\
   UPTIME = Get the uptime of the machine.\n\
     No specific parameters. No warning or critical threshold\n"));
  printf (_("\
   USEDDISKSPACE = Size and percentage of disk use.\n\
     Request a -l parameter containing the drive letter only.\n\
     Warning and critical thresholds can be specified with -w and -c.\n"));
  printf (_("\
   MEMUSE = Memory use.\n\
     Warning and critical thresholds can be specified with -w and -c.\n"));
  printf (_("\
   SERVICESTATE = Check the state of one or several services.\n\
     Request a -l parameters with the following syntax:\n\
     -l <service1>,<service2>,<service3>,...\n\
     You can specify -d SHOWALL in case you want to see working services\n\
		 in the returned string.\n"));
  printf (_("\
   PROCSTATE = Check if one or several process are running.\n\
     Same syntax as SERVICESTATE.\n"));
  printf (_("\
   COUNTER = Check any performance counter of Windows NT/2000.\n\
     Request a -l parameters with the following syntax:\n\
		 -l \"\\\\<performance object>\\\\counter\",\"<description>\n\
     The <description> parameter is optional and \n\
     is given to a printf output command which require a float parameters.\n\
     Some examples:\n\
       \"Paging file usage is %%.2f %%%%\"\n\
       \"%%.f %%%% paging file used.\"\n"));
	printf (_("Notes:\n\
 - The NSClient service should be running on the server to get any information\n\
   (http://nsclient.ready2run.nl).\n\
 - Critical thresholds should be lower than warning thresholds\n"));
}




void print_usage(void)
{
	printf(_("\
Usage: %s -H host -v variable [-p port] [-w warning] [-c critical]\n\
  [-l params] [-d SHOWALL] [-t timeout]\n"), progname);
	printf (_(UT_HLP_VRS), progname, progname);
}