This file is indexed.

/usr/sbin/checkrad is in freeradius 2.1.12+dfsg-1.2ubuntu8.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
#!/usr/bin/perl
#
# checkrad.pl	See if a user is (still) logged in on a certain port.
#
#		This is used by the FreeRADIUS server to check
#		if its idea of a user logged in on a certain port/nas
#		is correct if a double login is detected.
#
# Called as:	nas_type nas_ip nas_port login session_id
#
# Returns:	0 = no duplicate, 1 = duplicate, >1 = error.
#
# Version:	$Id$
#
#		livingston_snmp  1.2	Author: miquels@cistron.nl
#		cvx_snmp	 1.0	Author: miquels@cistron.nl
#		portslave_finger 1.0	Author: miquels@cistron.nl
#		max40xx_finger	 1.0	Author: costa@mdi.ca
#		ascend_snmp      1.1    Author: blaz@amis.net
#		computone_finger 1.2	Author: pacman@world.std.com
#		sub tc_tccheck	 1.1	Author: alexisv@compass.com.ph
#		cyclades_telnet	 1.2	Author: accdias@sst.com.br
#		patton_snmp	 1.0	Author: accdias@sst.com.br
#		digitro_rusers	 1.1	Author: accdias@sst.com.br
#		cyclades_snmp	 1.0	Author: accdias@sst.com.br
#		usrhiper_snmp    1.0    Author: igor@ipass.net
#		multitech_snmp   1.0    Author: ehonzay@willmar.com
#		netserver_telnet 1.0	Author: mts@interplanet.es
#		versanet_snmp    1.0    Author: support@versanetcomm.com
#		bay_finger	 1.0	Author: chris@shenton.org
#		cisco_l2tp	 1.14	Author: paul@distributel.net
#		mikrotik_telnet  1.1    Author: Evren Yurtesen <yurtesen@ispro.net.tr>
#		mikrotik_snmp    1.0    Author: Evren Yurtesen <yurtesen@ispro.net.tr>
#		redback_telnet          Author: Eduardo Roldan
#
#	Config: $debug is the file you want to put debug messages in
#		$snmpget is the location of your ``snmpget'' program
#		$snmpwalk is the location of your ``snmpwalk'' program
#	        $snmp_timeout is the timeout for snmp queries
#	        $snmp_retries is the number of retries for timed out snmp queries
#		$snmp_version is the version of to use for snmp queries [1,2c,3]
#		$rusers is the location of your ``rusers'' program
#		$naspass is the location of your NAS admin password file
#

$prefix		= "/usr";
$localstatedir	= "/var";
$logdir		= "/var/log/freeradius";
$sysconfdir	= "/etc";
$raddbdir	= "/etc/freeradius";

$debug		= "";
#$debug		= "$logdir/checkrad.log";

$snmpget	= "";
$snmpwalk	= "";
$snmp_timeout	= 5;
$snmp_retries	= 1;
$snmp_version	= "2c";
$rusers		= "/usr/bin/rusers";
$naspass	= "$raddbdir/naspasswd";

# Community string. Change this if yours isn't "public".
$cmmty_string	= "public";
# path to finger command
$finger = "/usr/bin/finger";

# Extremely slow way of converting port descriptions to actual indexes
$portisdescr = 0;

# Realm used by Cisco sub
$realm = '';

#
#	USR-Hiper: $hiper_density is the reported port density (default 256
#	but 24 makes more sense)
#
$hiper_density = 256;

#
#	Try to load Net::Telnet, SNMP_Session etc.
#	Do not complain if we cannot find it.
#	Prefer a locally installed copy.
#
BEGIN {
	unshift @INC, "/usr/local/lib/site_perl";

	eval "use Net::Telnet 3.00;";
	$::HAVE_NET_TELNET = ($@ eq "");

	eval "use SNMP_Session;";
	if ($@ eq "") {
		eval "use BER;";
		$::HAVE_SNMP_SESSION = ($@ eq "");
		eval "use Socket;";
	}
};

#
#	Get password from /etc/raddb/naspasswd file.
#	Returns (login, password).
#
sub naspasswd {
	my ($terminalserver, $emptyok) = @_;
	my ($login, $password);
	my ($ts, $log, $pass);

	unless (open(NFD, $naspass)) {
		if (!$emptyok) {
			print LOG "checkrad: naspasswd file not found; " .
			"possible match for $ARGV[3]\n" if ($debug);
			print STDERR "checkrad: naspasswd file not found; " .
			"possible match for $ARGV[3]\n";
		}
		return ();
	}
	while (<NFD>) {
		chop;
		next if (m/^(#|$|[\t ]+$)/);
		($ts, $log, $pass) = split(/\s+/, $_, 3);
		if ($ts eq $terminalserver) {
			$login = $log;
			$password = $pass;
			last;
		}
	}
	close NFD;
	if ($password eq "" && !$emptyok) {
		print LOG "checkrad: password for $ARGV[1] is null; " .
			"possible match for $ARGV[3] on " .
			"port $ARGV[2]\n" if ($debug);
		print STDERR "checkrad: password for $ARGV[1] is null; " .
			"possible match for $ARGV[3] on port $ARGV[2]\n";
	}
	($login, $password);
}

#
#	See if Net::Telnet is there.
#
sub check_net_telnet {
	if (!$::HAVE_NET_TELNET) {
		print LOG
		"  checkrad: Net::Telnet 3.00+ CPAN module not installed\n"
		if ($debug);
		print STDERR
		"checkrad: Net::Telnet 3.00+ CPAN module not installed\n";
		return 0;
	}
	1;
}

#
#       Do snmpwalk by calling snmpwalk.
#
sub snmpwalk_prog {
	my ($host, $community, $oid) = @_;
	local $_;

	print LOG "snpwalk: $snmpwalk -r $snmp_retries -t $snmp_timeout -v$snmp_version -c '$community' $host $oid\n";
	$_ = `$snmpwalk -r $snmp_retries -t $snmp_timeout -v$snmp_version -c '$community' $host $oid`;

	return $_;
}

#
#       Do snmpwalk.
#
sub snmpwalk {
	my $ret;

	if (-x $snmpwalk) {
		$ret = snmpwalk_prog(@_);
	} else {
		$e = "$snmpwalk not found!";
		print LOG "$e\n" if ($debug);
		print STDERR "checkrad: $e\n";
		$ret = "";
	}
	$ret;
}


#
#	Do snmpget by calling snmpget.
#
sub snmpget_prog {
	my ($host, $community, $oid) = @_;
	my ($ret);
	local $_;

	print LOG "snmpget: $snmpget -r $snmp_retries -t $snmp_timeout -v$snmp_version -c '$community' $host $oid\n";
	$_ = `$snmpget -r $snmp_retries -t $snmp_timeout -v$snmp_version -c '$community' $host $oid`;
	if (/^.*(\s|\")([0-9A-Za-z]{8})(\s|\"|$).*$/) {
		# Session ID format.
		$ret = $2;
	} elsif (/^.*=.*"(.*)"/) {
		# oid = "...." junk format.
		$ret = $1;
	} elsif (/^.*=\s*(?:.*:\s*)?(\S+)/) {
		# oid = string format
		$ret = $1;
	}

	# Strip trailing junk if any.
	$ret =~ s/\s*Hex:.*$//;
	$ret;
}

#
#	Do snmpget by using SNMP_Session.
#	Coded by Jerry Workman <jerry@newwave.net>
#
sub snmpget_session {
	my ($host, $community, $OID) = @_;
	my ($ret);
	local $_;
	my (@enoid, $var,$response, $bindings, $binding, $value);
	my ($inoid, $outoid, $upoid, $oid, @retvals);

	$OID =~ s/^.iso.org.dod.internet.private.enterprises/.1.3.6.1.4.1/;

	push @enoid,  encode_oid((split /\./, $OID));
	srand();

	my $session = SNMP_Session->open($host, $community, 161);
	if (!$session->get_request_response(@enoid)) {
		$e = "No SNMP answer from $ARGV[0].";
		print LOG "$e\n" if ($debug);
		print STDERR "checkrad: $e\n";
		return "";
	}
	$response = $session->pdu_buffer;
	($bindings) = $session->decode_get_response ($response);
	$session->close ();
	while ($bindings) {
		($binding,$bindings) = decode_sequence ($bindings);
		($oid,$value) = decode_by_template ($binding, "%O%@");
		my $tempo = pretty_print($value);
		$tempo=~s/\t/ /g;
		$tempo=~s/\n/ /g;
		$tempo=~s/^\s+//;
		$tempo=~s/\s+$//;

		push @retvals, $tempo;
	}
	$retvals[0];
}

#
#	Do snmpget
#
sub snmpget {
	my $ret;

	if ($::HAVE_SNMP_SESSION) {
		$ret = snmpget_session(@_);
	} elsif (-x $snmpget) {
		$ret = snmpget_prog(@_);
	} else {
		$e = "Neither SNMP_Session module or $snmpget found!";
		print LOG "$e\n" if ($debug);
		print STDERR "checkrad: $e\n";
		$ret = "";
	}
	$ret;
}

#
#   Get ifindex from description
#
sub ifindex {
	my $port = shift;
	
	# If its not an integer, portisdescr lies!
	return $port unless $portisdescr || $port !~ /^[0-9]*$/;
	
	$_ = snmpwalk($ARGV[1], "$cmmty_string", ".1.3.6.1.2.1.2.2.1.2");
	
	foreach (split /\n/){
		if(/\.([0-9]+)\s*=.*$port"?$/){
			print LOG "  port descr $port is at SNMP ifIndex $1\n" if ($debug);
			return $1;
		}
	}
	

	return $port;
}

#
#	Strip domains, prefixes and suffixes from username
#
#	Known prefixes: (P)PP, (S)LIP e (C)SLIP
#	Known suffixes: .ppp, .slip e .cslip
#
#	Author: Antonio Dias of SST Internet <accdias@sst.com.br>
#
sub strip_username {
	my ($user) = @_;
	#
	#	Trim white spaces.
	#
	$user =~ s/^\s*(.*?)\s*$/$1/;
	#
	#	Strip out domains, prefix and suffixes
	#
	$user =~ s/\@(.)*$//;
	$user =~ s/^[PSC]//;
	$user =~ s/\.(ppp|slip|cslip)$//;
	$user;
}

#
#	Check whether a session is current on any device which implements the standard IEEE 802.1X MIB
#
#	Note: Vendors use different formats for the session ID, and it often doesn't map
#	between Acct-Session-ID so can't be used to identify and 802.1X session (we ignore it).
#
#	If a session matching the username is found on the port specified, and the 
#	session is still active then thats good enough...
#
#	Author: Arran Cudbard-Bell <arran.cudbard-bell@freeradius.org>
#
$ieeedot1m   = '.iso.0.8802.1.1';
sub dot1x_snmp {
	$ifIndex = ifindex($ARGV[2]);
	
	# User matches and not terminated yet?
	if(
		snmpget($ARGV[1], "$cmmty_string", "$ieeedot1m.1.1.2.4.1.9.$ifIndex") eq $ARGV[3] &&
		snmpget($ARGV[1], "$cmmty_string", "$ieeedot1m.1.1.2.4.1.8.$ifIndex") eq '999'
	){
		print LOG "  found user $ARGV[3] at port $ARGV[2] ($ifIndex)" if $debug;
		return 1;
	}
	
	0;
}

#
#	See if the user is logged in using the Livingston MIB.
#	We don't check the username but the session ID.
#
$lvm	 = '.iso.org.dod.internet.private.enterprises.307';
sub livingston_snmp {

	#
	#	We don't know at which ifIndex S0 is, and
	#	there might be a hole at S23, or at S30+S31.
	#	So we figure out dynamically which offset to use.
	#
	#	If the port < S23, probe ifIndex 5.
	#	If the port < S30, probe IfIndex 23.
	#	Otherwise probe ifIndex 32.
	#
	my $ifIndex;
	my $test_index;
	if ($ARGV[2] < 23) {
		$test_index = 5;
	} elsif ($ARGV[2] < 30) {
		$test_index = 23;
	} else {
		$test_index = 32;
	}
	$_ = snmpget($ARGV[1], "$cmmty_string", "$lvm.3.2.1.1.1.2.$test_index");
	/S([0-9]+)/;
	$xport = $1 + 0;
	$ifIndex = $ARGV[2] + ($test_index - $xport);

	print LOG "  port S$ARGV[2] at SNMP ifIndex $ifIndex\n"
		if ($debug);

	#
	#	Now get the session id from the terminal server.
	#
	$sessid = snmpget($ARGV[1], "$cmmty_string", "$lvm.3.2.1.1.1.5.$ifIndex");

	print LOG "  session id at port S$ARGV[2]: $sessid\n" if ($debug);

	($sessid eq $ARGV[4]) ? 1 : 0;
}

#
#	See if the user is logged in using the Aptis MIB.
#	We don't check the username but the session ID.
#
# sessionStatusActiveName
$apm1	 = '.iso.org.dod.internet.private.enterprises.2637.2.2.102.1.12';
# sessionStatusActiveStopTime
$apm2	 = '.iso.org.dod.internet.private.enterprises.2637.2.2.102.1.20';
sub cvx_snmp {

	# Remove unique identifier, then take remainder of the
	# session-id as a hex number, convert that to decimal.
	my $sessid = $ARGV[4];
	$sessid =~ s/^.*://;
	$sessid =~ s/^0*//;
	$sessid = "0" if ($sessid eq '');

	#
	#	Now get the login from the terminal server.
	#	Blech - the SNMP table is called 'sessionStatusActiveTable,
	#	but it sometimes lists inactive sessions too.
	#	However an active session doesn't have a Stop time,
	#	so we can differentiate that way.
	#
	my $login = snmpget($ARGV[1], "$cmmty_string", "$apm1." . hex($sessid));
	my $stopt = snmpget($ARGV[1], "$cmmty_string", "$apm2." . hex($sessid));
	$login = "--" if ($stopt > 0);

	print LOG "  login with session-id $ARGV[4]: $login\n" if ($debug);

	(strip_username($login) eq strip_username($ARGV[3])) ? 1 : 0;
}

#
#	See if the user is logged in using the Cisco MIB
#
$csm	 = '.iso.org.dod.internet.private.enterprises.9';
sub cisco_snmp {

	# Look up community string in naspasswd file.
	my ($login, $pass) = naspasswd($ARGV[1], 1);
	if ($login eq '') {
		$pass = $cmmty_string;
	} elsif ($login ne 'SNMP') {
		if ($debug) {
			print LOG
			"   Error: Need SNMP community string for $ARGV[1]\n";
		}
		return 2;
	}

	my $port = $ARGV[2];
	my $sess_id = hex($ARGV[4]);

	if ($port < 20000) {
		#
		#	The AS5350 doesn't support polling the session ID,
		#	so we do it based on nas-port-id. This only works
		#	for analog sessions where port < 20000.
		#	Yes, this means that simultaneous-use on the as5350
		#	doesn't work for ISDN users.
		#
		$login = snmpget($ARGV[1], $pass, "$csm.2.9.2.1.18.$port");
		print LOG "  user at port S$port: $login\n" if ($debug);
	} else {
		$login = snmpget($ARGV[1], $pass,
				"$csm.9.150.1.1.3.1.2.$sess_id");
		print LOG "  user with session id $ARGV[4] ($sess_id): " .
			"$login\n" if ($debug);
	}

	#	($login eq $ARGV[3]) ? 1 : 0;
	if($login eq $ARGV[3]) {
        	return 1;
	}else{
		$out=snmpwalk($ARGV[1],$pass,".iso.org.dod.internet.private.enterprises.9.10.19.1.3.1.1.3");
        	if($out=~/\"$ARGV[3]\"/){
                	return 1;
        	}else{
                	return 0;
        	}
	}
}

#
#       Check a MultiTech CommPlete Server ( CC9600 & CC2400 )
#
#       Author: Eric Honzay of Bennett Office Products <ehonzay@willmar.com>
#
$msm    = '.iso.org.dod.internet.private.enterprises.995';
sub multitech_snmp {
	my $temp = $ARGV[2] + 1;

        $login = snmpget($ARGV[1], "$cmmty_string", "$msm.2.31.1.1.1.$temp");
        print LOG " user at port S$ARGV[2]: $login\n" if ($debug);

        ($login eq $ARGV[3]) ? 1 : 0;
}

#
#       Check a Computone Powerrack via finger
#
#       Old Author: Shiloh Costa of MDI Internet Inc. <costa@mdi.ca>
#       New Author: Alan Curry <pacman@world.std.com>
#
# The finger response format is version-dependent. To do this *right*, you
# need to know exactly where the port number and username are. I know that
# for 1.7.2, and 3.0.4 but for others I just guess.
# Oh yeah and on top of it all, the thing truncates usernames. --Pac.
#
# 1.7.2 and 3.0.4 both look like this:
#
# 0    0 000 00:56 luser         pppfsm  Incoming PPP, ppp00, 10.0.0.1
#
# and the truncated ones look like this:
#
# 25   0 000 00:15 longnameluse..pppfsm  Incoming PPP, ppp25, 10.0.0.26
#
# Yes, the fields run together. Long Usernames Considered Harmful.
#
sub computone_finger {
	my $trunc, $ver;

	open(FD, "$finger \@$ARGV[1]|") or return 2;
	<FD>; # the [hostname] line is definitely uninteresting
	$trunc = substr($ARGV[3], 0, 12);
	$ver = "";
	while(<FD>) {
		if(/cnx kernel release ([^ ,]+)[, ]/) {
			$ver = $1;
			next;
		}
		# Check for known versions
		if ($ver eq '1.7.2' || $ver eq '3.0.4') {
			if (/^\Q$ARGV[2]\E\s+\S+\s+\S+\s+\S+\s+\Q$trunc\E(\s+|\.\.)/) {
	 			close FD;
				return 1;
			}
			next;
		}
		# All others.
		if (/^\s*\Q$ARGV[2]\E\s+.*\s+\Q$trunc\E\s+/) {
			close FD;
			return 1;
		}
	}

	close FD;
	return 0;
}

#
#	Check an Ascend Max4000 or similar model via finger
#
#	Note: Not all software revisions support finger
#	      You may also need to enable the finger option.
#
#	Author: Shiloh Costa of MDI Internet Inc. <costa@mdi.ca>
#
sub max40xx_finger {
	open(FD, "$finger $ARGV[3]\@$ARGV[1]|");
	while(<FD>) {
	   $line = $_;
	   if( $line =~ /Session/ ){
		next;
	   }

	   if( $line =~ /$ARGV[4]/ ){
	      return 1; # user is online
	   }
	}
	close FD;
	return 0; # user is offline
}


#
#	Check an Ascend Max4000 or similar model via SNMP
#
#	Author: Blaz Zupan of Medinet <blaz@amis.net>
#
$asm   = '.iso.org.dod.internet.private.enterprises.529';
sub ascend_snmp {
	my $sess_id;
	my $l1, $l2;

	$l1 = '';
	$l2 = '';

	#
	#	If it looks like hex, only try it as hex,
	#	otherwise try it as both decimal and hex.
	#
	$sess_id = $ARGV[4];
	if ($sess_id !~ /^0/ && $sess_id !~ /[a-f]/i) {
		$l1 = snmpget($ARGV[1], "$cmmty_string", "$asm.12.3.1.4.$sess_id");
	}
	if (!$l1){
		$sess_id = hex $ARGV[4];
		$l2 = snmpget($ARGV[1], "$cmmty_string", "$asm.12.3.1.4.$sess_id");
	}

	print LOG "  user at port S$ARGV[2]: $l1 (dec)\n" if ($debug && $l1);
	print LOG "  user at port S$ARGV[2]: $l2 (hex)\n" if ($debug && $l2);

	(($l1 && $l1 eq $ARGV[3]) || ($l2 && $l2 eq $ARGV[3])) ? 1 : 0;
}


#
#	See if the user is logged in using the portslave finger.
#
sub portslave_finger {
	my ($Port_seen);

	$Port_seen = 0;

	open(FD, "$finger \@$ARGV[1]|");
	while(<FD>) {
		#
		#	Check for ^Port. If we don't see it we
		#	wont get confused by non-portslave-finger
		#	output too.
		#
		if (/^Port/) {
			$Port_seen++;
			next;
		}
		next if (!$Port_seen);
		next if (/^---/);

		($port, $user) = /^.(...) (...............)/;

		$port =~ s/ .*//;
		$user =~ s/ .*//;
		$ulen = length($user);
		#
		#	HACK: strip [PSC] from the front of the username,
		#	and things like .ppp from the end.
		#
		$user =~ s/^[PSC]//;
		$user =~ s/\.(ppp|slip|cslip)$//;

		#
		#	HACK: because ut_user usually has max. 8 characters
		#	we only compare up the the length of $user if the
		#	unstripped name had 8 chars.
		#
		$argv_user = $ARGV[3];
		if ($ulen == 8) {
			$ulen = length($user);
			$argv_user = substr($ARGV[3], 0, $ulen);
		}

		if ($port == $ARGV[2]) {
			if ($user eq $argv_user) {
				print LOG "  $user matches $argv_user " .
					"on port $port" if ($debug);
				close FD;
				return 1;
			} else {
				print LOG "  $user doesn't match $argv_user " .
					"on port $port" if ($debug);
				close FD;
				return 0;
			}
		}
	}
	close FD;
	0;
}

#
#	See if the user is already logged-in at the 3Com/USR Total Control.
#	(this routine by Alexis C. Villalon <alexisv@compass.com.ph>).
#	You must have the Net::Telnet module from CPAN for this to work.
#	You must also have your /etc/raddb/naspasswd made up.
#
sub tc_tccheck {
	#
	#	Localize all variables first.
	#
	my ($Port_seen, $ts, $terminalserver, $log, $login, $pass, $password);
	my ($telnet, $curprompt, $curline, $ok, $totlines, $ccntr);
	my (@curlines, @cltok, $user, $port, $ulen);

	return 2 unless (check_net_telnet());

	$terminalserver = $ARGV[1];
	$Port_seen = 0;
	#
	#	Get login name and password for a certain NAS from $naspass.
	#
	($login, $password) = naspasswd($terminalserver, 1);
	return 2 if ($password eq "");

	#
	#	Communicate with NAS using Net::Telnet, then issue
	#	the command "show sessions" to see who are logged in.
	#	Thanks to Chris Jackson <chrisj@tidewater.net> for the
	#	for the "-- Press Return for More --" workaround.
	#
	$telnet = new Net::Telnet (Timeout => 5,
				   Prompt => '/\>/');
	$telnet->open($terminalserver);
	$telnet->login($login, $password);
	$telnet->print("show sessions");
	while ($curprompt ne "\>") {
		($curline, $curprompt) = $telnet->waitfor
			(String => "-- Press Return for More --",
			 String => "\>",
			 Timeout => 5);
		$ok = $telnet->print("");
		push @curlines, split(/^/m, $curline);
	}
	$telnet->close;
	#
	#	Telnet closed.  We got the info.  Let's examine it.
	#
	$totlines = @curlines;
	$ccntr = 0;
	while($ccntr < $totlines) {
		#
		#	Check for ^Port.
		#
		if ($curlines[$ccntr] =~ /^Port/) {
			$Port_seen++;
			$ccntr++;
			next;
		}
		#
		#	Ignore all unnecessary lines.
		#
		if (!$Port_seen || $curlines[$ccntr] =~ /^---/ ||
			$curlines[$ccntr] =~ /^ .*$/) {
			$ccntr++;
			next;
		}
		#
		#	Parse the current line for the port# and username.
		#
		@cltok = split(/\s+/, $curlines[$ccntr]);
		$ccntr++;
		$port = $cltok[0];
		$user = $cltok[1];
		$ulen = length($user);
		#
		#	HACK: strip [PSC] from the front of the username,
		#	and things like .ppp from the end.  Strip S from
		#	the front of the port number.
		#
		$user =~ s/^[PSC]//;
		$user =~ s/\.(ppp|slip|cslip)$//;
		$port =~ s/^S//;
		#
		#	HACK: because "show sessions" shows max. 15 characters
		#	we only compare up to the length of $user if the
		#	unstripped name had 15 chars.
		#
		$argv_user = $ARGV[3];
		if ($ulen == 15) {
			$ulen = length($user);
			$argv_user = substr($ARGV[3], 0, $ulen);
		}
		if ($port == $ARGV[2]) {
			if ($user eq $argv_user) {
				print LOG "  $user matches $argv_user " .
					"on port $port" if ($debug);
				return 1;
			} else {
				print LOG "  $user doesn't match $argv_user " .
					"on port $port" if ($debug);
				return 0;
			}
		}
	}
	0;
}

#
#	Check a Cyclades PathRAS via telnet
#
#	Version: 1.2
#
#	Author: Antonio Dias of SST Internet <accdias@sst.com.br>
#
sub cyclades_telnet {
	#
	#	Localize all variables first.
	#
	my ($pr, $pr_login, $pr_passwd, $pr_prompt, $endlist, @list, $port, $user);
	#
	#	This variable must match PathRAS' command prompt
	#	string as entered in menu option 6.2.
	#	The value below matches the default command prompt.
	#
	$pr_prompt = '/Select option ==\>$/i';

	#
	#	This variable match the end of userslist.
	#
	$endlist = '/Type \<enter\>/i';

	#
	#	Do we have Net::Telnet installed?
	#
	return 2 unless (check_net_telnet());

	#
	#	Get login name and password for NAS
	#	from $naspass file.
	#
	($pr_login, $pr_passwd) = naspasswd($ARGV[1], 1);

	#
	#	Communicate with PathRAS using Net::Telnet, then access
	#	menu option 6.8 to see who are logged in.
	#	Based on PathRAS firmware version 1.2.3
	#
	$pr = new Net::Telnet (
		Timeout		=> 5,
		Host		=> $ARGV[1],
		ErrMode		=> 'return'
	) || return 2;

	#
	#	Force PathRAS shows its banner.
	#
	$pr->break();

	#
	#	Log on PathRAS
	#
	if ($pr->waitfor(Match => '/login : $/i') == 1) {
		$pr->print($pr_login);
	} else {
		print LOG " Error: sending login name to PathRAS\n" if ($debug);
		$pr->close;
		return 2;
	}

	if ($pr->waitfor(Match => '/password : $/i') == 1) {
		$pr->print($pr_passwd);
	} else {
		print LOG " Error: sending password to PathRAS.\n" if ($debug);
		$pr->close;
		return 2;
	}

	$pr->print();

	#
	#	Access menu option 6 "PathRAS Management"
	#
	if ($pr->waitfor(Match => $pr_prompt) == 1) {
		$pr->print('6');
	} else {
		print LOG "  Error: acessing menu option '6'.\n" if ($debug);
		$pr->close;
		return 2;
	}
	#
	#	Access menu option 8 "Show Active Ports"
	#
	if ($pr->waitfor(Match => $pr_prompt) == 1) {
		@list = $pr->cmd(String => '8', Prompt => $endlist);
	} else {
		print LOG "  Error: acessing menu option '8'.\n" if ($debug);
		$pr->close;
		return 2;
	}
	#
	#	Since we got the info we want, let's close
	#	the telnet session
	#
	$pr->close;

	#
	#	Lets examine the userlist stored in @list
	#
	foreach(@list) {
		#
		#	We are interested in active sessions only
		#
		if (/Active/i) {
			($port, $user) = split;
			#
			#	Strip out any prefix, suffix and
			#	realm from $user check to see if
			#	$ARGV[3] matches.
			#
			if(strip_username($ARGV[3]) eq strip_username($user)) {
				print LOG "  User '$ARGV[3]' found on '$ARGV[1]:$port'.\n" if ($debug);
				return 1;
			}
		}
	}
	print LOG "  User '$ARGV[3]' not found on '$ARGV[1]'.\n" if ($debug);
   	0;
}

#
#	Check a Patton 2800 via SNMP
#
#	Version: 1.0
#
#	Author: Antonio Dias of SST Internet <accdias@sst.com.br>
#
sub patton_snmp {
   my($oid);

   #$oid = '.1.3.6.1.4.1.1768.5.100.1.40.' . hex $ARGV[4];
   # Reported by "Andria Legon" <andria@patton.com>
   # The OID below should be the correct one instead of the one above.
   $oid = '.1.3.6.1.4.1.1768.5.100.1.56.' . hex $ARGV[4];
   #
   # Check if the session still active
   #
   if (snmpget($ARGV[1], "monitor", "$oid") == 0) {
      print LOG "  Session $ARGV[4] still active on NAS " .
      	"$ARGV[1], port $ARGV[2], for user $ARGV[3].\n" if ($debug);
      return 1;
   }
   0;
}

#
#      Check a Digitro BXS via rusers
#
#      Version: 1.1
#
#      Author: Antonio Dias of SST Internet <accdias@sst.com.br>
#
sub digitro_rusers {
   my ($ret);
   local $_;

   if (-e $rusers && -x $rusers) {
      #
      # Get a list of users logged in via rusers
      #
      $_ = `$rusers $ARGV[1]`;
      $ret = ((/$ARGV[3]/) ? 1 : 0);
   } else {
      print LOG "   Error: can't execute $rusers\n" if $debug;
      $ret = 2;
   }
   $ret;
}

#
#	Check Cyclades PR3000 and PR4000 via SNMP
#
#	Version: 1.0
#
#	Author: Antonio Dias of SST Internet <accdias@sst.com.br>
#
sub cyclades_snmp {
   my ($oid, $ret);
   local $_;

   $oid = ".1.3.6.1.4.1.2925.3.3.6.1.1.2";

   $_ = snmpwalk($ARGV[1],"$cmmty_string",$oid);
   $ret = ((/$ARGV[3]/) ? 1 : 0);
   $ret;
}

#
#	3Com/USR HiPer Arc Total Control.
#	This works with HiPer Arc 4.0.30
#	(this routine by Igor Brezac <igor@ipass.net>)
#

#       This routine modified by Dan Halverson <danh@tbc.net>
#       to suport additional versions of Hiper Arc
#

$usrm	 = '.iso.org.dod.internet.private.enterprises.429';
sub usrhiper_snmp {
	my ($login,$password,$oidext);

	# Look up community string in naspasswd file.
        ($login, $password) = naspasswd($ARGV[1], 1);
	if ($login && $login ne 'SNMP') {
		if($debug) {
			print LOG
			"   Error: Need SNMP community string for $ARGV[1]\n";
		}
		return 2;
	} else {
# If password is defined in naspasswd file, use it as community, otherwise use $cmmty_string
		if ($password eq '') {
		    $password = "$cmmty_string";
		}
	}
	my ($ver) = get_hiper_ver(usrm=>$usrm, target=>$ARGV[1], community=>$password);
	$oidext = get_oidext(ver=>$ver, tty=>$ARGV[2]);
	my ($login);

	$login = snmpget($ARGV[1], $password, "$usrm.4.10.1.1.18.$oidext");
	if ($login =~ /\"/) {
		$login =~ /^.*\"([^"]+)\"/;
		$login = $1;
	}

	print LOG "  user at port S$ARGV[2]: $login\n" if ($debug);

	($login eq $ARGV[3]) ? 1 : 0;
}

#
#     get_hiper_ver and get_oidext by Dan Halverson <danh@tbc.net>
#
sub get_hiper_ver {
    my (%args) = @_;
    my ($ver
	);
    $ver = snmpget ($args{'target'}, $args{'community'}, $args{'usrm'}.".4.1.14.0");
    return($ver);
}

#
#   Add additional OID checks below before the else.
#   Else is for 4.0.30
#
sub get_oidext {
    my (%args) = @_;
    my ($oid
	);
    if ($args{'ver'} =~ /V5.1.99/) {
	$oid = $args{'tty'}+1257-1;
    }
    else {
	$oid = 1257 + 256*int(($args{'tty'}-1) / $hiper_density) +
	                     (($args{'tty'}-1) % $hiper_density);
    }
    return($oid);
}

#
#	Check USR Netserver with Telnet - based on tc_tccheck.
#	By "Marti" <mts@interplanet.es>
#
sub usrnet_telnet {
	#
	#	Localize all variables first.
	#
	my ($ts, $terminalserver, $login, $password);
	my ($telnet, $curprompt, $curline, $ok);
	my (@curlines, $user, $port);

	return 2 unless (check_net_telnet());

	$terminalserver = $ARGV[1];
	$Port_seen = 0;
	#
	#	Get login name and password for a certain NAS from $naspass.
	#
	($login, $password) = naspasswd($terminalserver, 1);
	return 2 if ($password eq "");

	#
	#	Communicate with Netserver using Net::Telnet, then access
	#	list connectionsto see who are logged in.
	#
	$telnet = new Net::Telnet (Timeout => 5,
				   Prompt => '/\>/');
	$telnet->open($terminalserver);

	#
	#	Log on Netserver
	#
	$telnet->login($login, $password);

	#
	#     Launch list connections command

	$telnet->print("list connections");

	while ($curprompt ne "\>") {
		($curline, $curprompt) = $telnet->waitfor
			( String => "\>",
			 Timeout => 5);
		$ok = $telnet->print("");
		push @curlines, split(/^/m, $curline);
	}

	$telnet->close;
	#
	#	Telnet closed.  We got the info.  Let's examine it.
	#
	foreach(@curlines) {
		if ( /mod\:/ ) {
			($port, $user, $dummy) = split;
			#
			# Strip out any prefixes and suffixes
			# from the username
			#
			# uncomment this if you use the standard
			# prefixes
			#$user =~ s/^[PSC]//;
			#$user =~ s/\.(ppp|slip|cslip)$//;
			#
			# Check to see if $user is already connected
			#
			if ($user eq $ARGV[3]) {
				print LOG "  $user matches $ARGV[3] " .
					"on port $port" if ($debug);
				return 1;
			};
		};
	};
	print LOG
	"  $ARGV[3] not found on Netserver logged users list " if ($debug);
	0;
}

#
#	Versanet's Perl Script Support:
#
#	___ versanet_snmp 1.0 by support@versanetcomm.com ___ July 1999
#	Versanet Enterprise MIB Base: 1.3.6.1.4.1.2180
#
#	VN2001/2002 use slot/port number to locate modems. To use snmp get we
#	have to translate the original port number into a slot/port pair.
#
$vsm     = '.iso.org.dod.internet.private.enterprises.2180';
sub versanet_snmp {

	print LOG "argv[2] = $ARGV[2] " if ($debug);
	$port = $ARGV[2]%8;
	$port = 8 if ($port eq 0);
	print LOG "port = $port " if ($debug);
	$slot = (($ARGV[2]-$port)/8)+1;
	print LOG "slot = $slot" if ($debug);
	$loginname = snmpget($ARGV[1], "$cmmty_string", "$vsm.27.1.1.3.$slot.$port");
#
#	Note: the "$cmmty_string" string above could be replaced by the public
#	      community string defined in Versanet VN2001/VN2002.
#
	  print LOG "  user at slot $slot port $port: $loginname\n" if ($debug);	  ($loginname eq $ARGV[3]) ? 1 : 0;
}


# 1999/08/24 Chris Shenton <chris@shenton.org>
# Check Bay8000 NAS (aka: Annex) using finger.
# Returns from "finger @bay" like:
#   Port  What User         Location         When          Idle  Address
#   asy2  PPP  bill         ---              9:33am         :08  192.168.1.194
#   asy4  PPP  hillary      ---              9:36am         :04  192.168.1.195
#   [...]
# But also returns partial-match users if you say like "finger g@bay":
#   Port  What User         Location         When          Idle  Address
#   asy2  PPP  gore         ---              9:33am         :09  192.168.1.194
#   asy22 PPP  gwbush       ---              Mon  9:19am    :07  192.168.1.80
# So check exact match of username!

sub bay_finger {		# ARGV: 1=nas_ip, 2=nas_port, 3=login, 4=sessid
    open(FINGER, "$finger $ARGV[3]\@$ARGV[1]|") || return 2; # error
    while(<FINGER>) {
	my ($Asy, $PPP, $User) = split;
	if( $User =~ /^$ARGV[3]$/ ){
	    close FINGER;
	    print LOG "checkrad:bay_finger: ONLINE $ARGV[3]\@$ARGV[1]"
		if ($debug);
	    return 1; # online
	}
    }
    close FINGER;
    print LOG "checkrad:bay_finger: offline $ARGV[3]\@$ARGV[1]" if ($debug);
    return 0; # offline
}

#
#	Cisco L2TP support
#	This is for PPP sessions coming from an L2TP tunnel from a Dial
#	or DSL wholesale provider
#	Paul Khavkine <paul@distributel.net>
#	July 19 2001
#
# find_l2tp_login() walks a part of cisco vpdn tree to find out what session
# and tunnel ID's are for a given Virtual-Access interface to construct
# the following OID: .1.3.6.1.4.1.9.10.24.1.3.2.1.2.2.$tunID.$sessID
# Then gets the username from that OID.
# Make sure you set the $realm variable at the begining of the file if
# needed. The new type for naslist is cisco_l2tp

sub find_l2tp_login
{
  my($host, $community, $port_num) = @_;
  my $l2tp_oid = '.1.3.6.1.4.1.9.10.24.1.3.2.1.2.2';
  my $port_oid = '.iso.org.dod.internet.private.enterprises.9.10.51.1.2.1.1.2.2';
  my $port = 'Vi' . $port_num;

  my $sess = new SNMP::Session(DestHost => $host, Community =>  $community);
  my $snmp_var = new  SNMP::Varbind(["$port_oid"]);
  my $val = $sess->getnext($snmp_var);

  do
  {
    $sess->getnext($snmp_var);
  } until ($snmp_var->[$SNMP::Varbind::val_f] =~ /$port/) ||
	(!($snmp_var->[$SNMP::Varbind::ref_f] =~ /^$port_oid\.(\d+)\.(\d+)$/)) ||
  	($sess->{ErrorNum});

  my $val1 = $snmp_var->[$SNMP::Varbind::ref_f];

  if ($val1 =~ /^$port_oid/) {
    $result = substr($val1, length($port_oid));
    $result =~ /^\.(\d+)\.(\d+)$/;
    $tunID = $1;
    $sessID = $2;
  }

  my $snmp_var1 = new SNMP::Varbind(["$l2tp_oid\.$tunID\.$sessID"]);
  $val = $sess->get($snmp_var1);
  my $login = $snmp_var1->[$SNMP::Varbind::val_f];

  return $login;
}

sub cisco_l2tp_snmp
{
  my $login = find_l2tp_login("$ARGV[1]", $cmmty_string, "$ARGV[2]");
  print LOG "  user at port S$ARGV[2]: $login\n" if ($debug);
  ($login eq "$ARGV[3]\@$realm") ? 1 : 0;
}

sub mikrotik_snmp {

  # Set SNMP version
  # MikroTik only supports version 1
  $snmp_version = "1";

  # Look up community string in naspasswd file.
  ($login, $password) = naspasswd($ARGV[1], 1);
  if ($login && $login ne 'SNMP') {
    if($debug) {
      print LOG "Error: Need SNMP community string for $ARGV[1]\n";
    }
    return 2;
  } else {
  # If password is defined in naspasswd file, use it as community,
  # otherwise use $cmmty_string
    if ($password eq '') {
      $password = "$cmmty_string";
    }
  }

  # We want interface descriptions
  $oid = "ifDescr";

  # Mikrotik doesnt give port IDs correctly to RADIUS :(
  # practically this would limit us to a simple only-one user limit for
  # this script to work properly.
  @output = snmpwalk_prog($ARGV[1], $password, "$oid");

  foreach $line ( @output ) {
    #remove newline
    chomp $line;
    #remove trailing whitespace
    ($line = $line) =~ s/\s+$//;
    if( $line =~ /<.*-$ARGV[3]>/ ) {
      $username_seen++;
    }
  }

  #lets return something
  if ($username_seen > 0) {
    return 1;
  } else {
    return 0;
  }
}

sub mikrotik_telnet {
  # Localize all variables first.
  my ($t, $login, $password);
  my (@fields, @output, $output, $username_seen, $user);

  return 2 unless (check_net_telnet());

  $terminalserver = $ARGV[1];
  $user = $ARGV[3];

  # Get login name and password for a certain NAS from $naspass.
  ($login, $password) = naspasswd($terminalserver, 1);
  return 2 if ($password eq "");

  # MikroTik routeros doesnt tell us to which port the user is connected
  # practically this would limit us to a simple only-one user limit for
  # this script to work properly.
  $t = new Net::Telnet (Timeout => 5,
                        Prompt => '//\[.*@.*\] > /');

  # Dont just exit when there is error
  $t->errmode('return');

  # Telnet to terminal server
  $t->open($terminalserver) or return 2;

  #Send login and password etc.
  $t->login(Name => $login,
            Password => $password,
  # We must detect if we are logged in from the login banner.
  # Because if routeros is with a free license the command
  # prompt dont come. Instead it waits us to press "Enter".
            Prompt => '/MikroTik/');

  # Just be sure that routeros isn't waiting for us to press "Enter"
  $t->print("");

  # Wait for the real prompt
  $t->waitfor('/\[.*@.*\] > /');

  # It is not possible to get the line numbers etc.
  # Thus we cant support if simultaneus-use is over 1
  # At least I was using pppoe so it wasnt possible.
  $t->print('ppp active print column name detail');

  # Somehow routeros echo'es our commands 2 times. We dont want to mix
  # this with the real command prompt.
  $t->waitfor('/\[.*@.*\] > ppp active print column name detail/');

  # Now lets get the list of online ppp users.
  ( $output ) = $t->waitfor('/\[.*@.*\] > /');

  # For debugging we can print the list to stdout
#  print $output;

  #Lets logout to make everybody happy.
  #If we close the connection without logging out then routeros
  #starts to complain after a while. Saying;
  #telnetd: All network ports in use.
  $t->print("quit");
  $t->close;

  #check for # of $user in output
  #the output includes only one = between name and username so we can
  #safely use it as a seperator.

#disabled until mikrotik starts to send newline after each line...
#  @output = $output;
#  foreach $line ( @output ) {
#    #remove newline
#    chomp $line;
#    #remove trailing whitespace
#    ($line = $line) =~ s/\s+$//;
#    if( $line =~ /name=/ ) {
#      print($line);
#      @fields = split( /=/, $line );
#      if( $fields[1] == "\"$user\"") {
#        $username_seen++;
#      }
#    }
#  }

  if( $output =~ /name="$user"/ ) {
    $username_seen++;
  }

  #lets return something
  if ($username_seen > 0) {
    return 1;
  } else {
    return 0;
  }
}

sub redback_telnet {
    #Localize all variables first.
    my ($terminalserver, $login, $password);
    my ($user, $context, $operprompt, $adminprompt, $t);
    return 2 unless (check_net_telnet());
    $terminalserver = $ARGV[1];
    ($user, $context) = split /@/, $ARGV[3];
    if (not $user) {
	print LOG " Error: No user defined\n" if ($debug);
	return 2;
    }
    if (not $context) {
	print LOG " Error: No context defined\n" if ($debug);
	return 2;
    }

    # Get loggin information
    ($root, $password) = naspasswd($terminalserver, 1);
    return 2 if ($password eq "");

    $operprompt = '/\[.*\].*>$/';
    $adminprompt = '/\[.*\].*#$/';

    # Logging to the RedBack NAS
    $t = new Net::Telnet (Timeout => 5, Prompt => $operprompt);
    $t->input_log("./debug");
    $t->open($terminalserver);
    $t->login($root, $password);

    #Enable us
    $t->print('ena');
    $t->waitfor('/Password/');
    $t->print($password);
    $t->waitfor($adminprompt);
    $t->prompt($adminprompt);

    #Switch context
    $t->cmd(String => "context $context");

    #Ask the question
    @lines = $t->cmd(String => "show subscribers active $user\@$context");
    if ($lines[0] =~ /subscriber $user\@$context/ ) {
	return 1;
    }
    return 0;
}

###############################################################################

# Poor man's getopt (for -d)
if ($ARGV[0] eq '-d') {
	shift @ARGV;
	$debug = "stdout";
}

if ($debug) {
	if ($debug eq 'stdout') {
		open(LOG, ">&STDOUT");
	} elsif ($debug eq 'stderr') {
		open(LOG, ">&STDERR");
	} else {
		open(LOG, ">>$debug");
		$now = localtime;
		print LOG "$now checkrad @ARGV\n";
	}
}

if ($#ARGV != 4) {
	print LOG "Usage: checkrad nas_type nas_ip " .
			"nas_port login session_id\n" if ($debug);
	print STDERR "Usage: checkrad nas_type nas_ip " .
			"nas_port login session_id\n"
			unless ($debug =~ m/^(stdout|stderr)$/);
	close LOG if ($debug);
	exit(2);
}

if ($ARGV[0] eq 'livingston') {
	$ret = &livingston_snmp;
} elsif ($ARGV[0] eq 'cisco') {
	$ret = &cisco_snmp;
} elsif ($ARGV[0] eq 'cvx') {
	$ret = &cvx_snmp;
} elsif ($ARGV[0] eq 'multitech') {
	$ret = &multitech_snmp;
} elsif ($ARGV[0] eq 'computone') {
	$ret = &computone_finger;
} elsif ($ARGV[0] eq 'max40xx') {
	$ret = &max40xx_finger;
} elsif ($ARGV[0] eq 'ascend' || $ARGV[0] eq 'max40xx_snmp') {
	$ret = &ascend_snmp;
} elsif ($ARGV[0] eq 'portslave') {
	$ret = &portslave_finger;
} elsif ($ARGV[0] eq 'tc') {
	$ret = &tc_tccheck;
} elsif ($ARGV[0] eq 'pathras') {
	$ret = &cyclades_telnet;
} elsif ($ARGV[0] eq 'pr3000') {
	$ret = &cyclades_snmp;
} elsif ($ARGV[0] eq 'pr4000') {
	$ret = &cyclades_snmp;
} elsif ($ARGV[0] eq 'patton') {
	$ret = &patton_snmp;
} elsif ($ARGV[0] eq 'digitro') {
	$ret = &digitro_rusers;
} elsif ($ARGV[0] eq 'usrhiper') {
	$ret = &usrhiper_snmp;
} elsif ($ARGV[0] eq 'netserver') {
	$ret = &usrnet_telnet;
} elsif ($ARGV[0] eq 'versanet') {
	$ret = &versanet_snmp;
} elsif ($ARGV[0] eq 'bay') {
	$ret = &bay_finger;
} elsif ($ARGV[0] eq 'cisco_l2tp'){
	$ret = &cisco_l2tp_snmp;
} elsif ($ARGV[0] eq 'mikrotik'){
	$ret = &mikrotik_telnet;
} elsif ($ARGV[0] eq 'mikrotik_snmp'){
	$ret = &mikrotik_snmp;
} elsif ($ARGV[0] eq 'redback'){
	$ret = &redback_telnet;
} elsif ($ARGV[0] eq 'dot1x'){
	$ret = &dot1x_snmp;
} elsif ($ARGV[0] eq 'other') {
	$ret = 1;
} else {
	print LOG "  checkrad: unknown NAS type $ARGV[0]\n" if ($debug);
	print STDERR "checkrad: unknown NAS type $ARGV[0]\n";
	$ret = 2;
}

if ($debug) {
	$mn = "login ok";
	$mn = "double detected" if ($ret == 1);
	$mn = "error detected" if ($ret == 2);
	print LOG "  Returning $ret ($mn)\n";
	close LOG;
}

exit($ret);