summaryrefslogtreecommitdiff
path: root/include/modules.h
blob: da2bfe023ec0079902b02d19e0484a9c21969e65 (plain)
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
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
 *                       E-mail:
 *                <brain@chatspike.net>
 *           	  <Craig@chatspike.net>
 *     
 * Written by Craig Edwards, Craig McLure, and others.
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */


#ifndef __PLUGIN_H
#define __PLUGIN_H

// log levels

#define DEBUG 10
#define VERBOSE 20
#define DEFAULT 30
#define SPARSE 40
#define NONE 50

// used with OnExtendedMode() method of modules

#define MT_CHANNEL 1
#define MT_CLIENT 2
#define MT_SERVER 3

// used with OnAccessCheck() method of modules

#define ACR_DEFAULT 0		// Do default action (act as if the module isnt even loaded)
#define ACR_DENY 1		// deny the action
#define ACR_ALLOW 2		// allow the action

#define AC_KICK 0		// a user is being kicked
#define AC_DEOP 1		// a user is being deopped
#define AC_OP 2			// a user is being opped
#define AC_VOICE 3		// a user is being voiced
#define AC_DEVOICE 4		// a user is being devoiced
#define AC_HALFOP 5		// a user is being halfopped
#define AC_DEHALFOP 6		// a user is being dehalfopped
#define AC_INVITE 7		// a user is being invited
#define AC_GENERAL_MODE 8	// a user channel mode is being changed

// used to define a set of behavior bits for a module

#define VF_STATIC		1	// module is static, cannot be /unloadmodule'd
#define VF_VENDOR		2	// module is a vendor module (came in the original tarball, not 3rd party)
#define VF_SERVICEPROVIDER	4	// module provides a service to other modules (can be a dependency)
#define VF_COMMON		8	// module needs to be common on all servers in a mesh to link

#include "dynamic.h"
#include "base.h"
#include "ctables.h"
#include <string>
#include <deque>
#include <sstream>

/** Low level definition of a FileReader classes file cache area
 */
typedef std::deque<std::string> file_cache;
typedef file_cache string_list;

/** Holds a list of users in a channel
 */
typedef std::deque<userrec*> chanuserlist;


// This #define allows us to call a method in all
// loaded modules in a readable simple way, e.g.:
// 'FOREACH_MOD OnConnect(user);'

#define FOREACH_MOD for (int _i = 0; _i <= MODCOUNT; _i++) modules[_i]->

// This define is similar to the one above but returns a result in MOD_RESULT.
// The first module to return a nonzero result is the value to be accepted,
// and any modules after are ignored.

// *********************************************************************************************

#define FOREACH_RESULT(x) { MOD_RESULT = 0; \
			for (int _i = 0; _i <= MODCOUNT; _i++) { \
			int res = modules[_i]->x ; \
			if (res != 0) { \
				MOD_RESULT = res; \
				break; \
			} \
		} \
	} 
   
// *********************************************************************************************

#define FD_MAGIC_NUMBER -42

extern void createcommand(char* cmd, handlerfunc f, char flags, int minparams, char* source);
extern void server_mode(char **parameters, int pcnt, userrec *user);

// class Version holds the version information of a Module, returned
// by Module::GetVersion (thanks RD)

/** Holds a module's Version information
 *  The four members (set by the constructor only) indicate details as to the version number
 *  of a module. A class of type Version is returned by the GetVersion method of the Module class.
 */
class Version : public classbase
{
 public:
	 const int Major, Minor, Revision, Build, Flags;
	 Version(int major, int minor, int revision, int build, int flags);
};

/** Holds /ADMIN data
 *  This class contains the admin details of the local server. It is constructed by class Server,
 *  and has three read-only values, Name, Email and Nick that contain the specified values for the
 *  server where the module is running.
 */
class Admin : public classbase
{
 public:
	 const std::string Name, Email, Nick;
	 Admin(std::string name, std::string email, std::string nick);
};


// Forward-delacare module for ModuleMessage etc
class Module;

// Thanks to Rob (from anope) for the idea of this message passing API
// (its been done before, but this seemed a very neat and tidy way...

/** The ModuleMessage class is the base class of Request and Event
 * This class is used to represent a basic data structure which is passed
 * between modules for safe inter-module communications.
 */
class ModuleMessage : public classbase
{
 public:
        /** This class is pure virtual and must be inherited.
         */
        virtual char* Send() = 0;
};

/** The Request class is a unicast message directed at a given module.
 * When this class is properly instantiated it may be sent to a module
 * using the Send() method, which will call the given module's OnRequest
 * method with this class as its parameter.
 */
class Request : public ModuleMessage
{
 protected:
        /** This member holds a pointer to arbitary data set by the emitter of the message
         */
        char* data;
        /** This is a pointer to the sender of the message, which can be used to
         * directly trigger events, or to create a reply.
         */
        Module* source;
        /** The single destination of the Request
         */
        Module* dest;
 public:
        /** Create a new Request
         */
        Request(char* anydata, Module* src, Module* dst);
        /** Fetch the Request data
         */
        char* GetData();
        /** Fetch the request source
         */
        Module* GetSource();
        /** Fetch the request destination (should be 'this' in the receiving module)
         */
        Module* GetDest();
        /** Send the Request.
         * Upon returning the result will be arbitary data returned by the module you
         * sent the request to. It is up to your module to know what this data is and
         * how to deal with it.
         */
        char* Send();
};


/** The Event class is a unicast message directed at all modules.
 * When the class is properly instantiated it may be sent to all modules
 * using the Send() method, which will trigger the OnEvent method in
 * all modules passing the object as its parameter.
 */
class Event : public ModuleMessage
{
 protected:
        /** This member holds a pointer to arbitary data set by the emitter of the message
         */
        char* data;
        /** This is a pointer to the sender of the message, which can be used to
         * directly trigger events, or to create a reply.
         */
        Module* source;
        /** The event identifier.
         * This is arbitary text which should be used to distinguish
         * one type of event from another.
         */
        std::string id;
 public:
        /** Create a new Event
         */
        Event(char* anydata, Module* src, std::string eventid);
        /** Get the Event data
         */
        char* GetData();
        /** Get the event Source
         */
        Module* GetSource();
        /** Get the event ID.
         * Use this to determine the event type for safe casting of the data
         */
        std::string GetEventID();
        /** Send the Event.
         * The return result of an Event::Send() will always be NULL as
         * no replies are expected.
         */
        char* Send();
};


/** Base class for all InspIRCd modules
 *  This class is the base class for InspIRCd modules. All modules must inherit from this class,
 *  its methods will be called when irc server events occur. class inherited from module must be
 *  instantiated by the ModuleFactory class (see relevent section) for the plugin to be initialised.
 */
class Module : public classbase
{
 public:

	/** Default constructor
	 * creates a module class
	 */
	Module();

	/** Default destructor
	 * destroys a module class
	 */
	virtual ~Module();

	/** Returns the version number of a Module.
	 * The method should return a Version object with its version information assigned via
	 * Version::Version
	 */
	virtual Version GetVersion();

	/** Called when a user connects.
	 * The details of the connecting user are available to you in the parameter userrec *user
	 */
	virtual void OnUserConnect(userrec* user);

	/** Called when a user quits.
	 * The details of the exiting user are available to you in the parameter userrec *user
	 * This event is only called when the user is fully registered when they quit. To catch
	 * raw disconnections, use the OnUserDisconnect method.
	 */
	virtual void OnUserQuit(userrec* user);

	/** Called whenever a user's socket is closed.
	 * The details of the exiting user are available to you in the parameter userrec *user
	 * This event is called for all users, registered or not, as a cleanup method for modules
	 * which might assign resources to user, such as dns lookups, objects and sockets.
	 */
	virtual void OnUserDisconnect(userrec* user);

	/** Called when a user joins a channel.
	 * The details of the joining user are available to you in the parameter userrec *user,
	 * and the details of the channel they have joined is available in the variable chanrec *channel
	 */
	virtual void OnUserJoin(userrec* user, chanrec* channel);

	/** Called when a user parts a channel.
	 * The details of the leaving user are available to you in the parameter userrec *user,
	 * and the details of the channel they have left is available in the variable chanrec *channel
	 */
	virtual void OnUserPart(userrec* user, chanrec* channel);

	/** Called before a packet is transmitted across the irc network between two irc servers.
	 * This allows you to easily represent it in the correct ways to implement encryption, compression,
	 * digital signatures and anything else you may want to add. This should be regarded as a pre-processor
	 * and will be called before ANY other operations within the ircd core program.
	 */
	virtual void OnPacketTransmit(std::string &data, std::string serv);

	/** Called after a packet is received from another irc server.
	 * This allows you to easily represent it in the correct ways to implement encryption, compression,
	 * digital signatures and anything else you may want to add. This should be regarded as a pre-processor
	 * and will be called immediately after the packet is received but before any other operations with the
	 * core of the ircd.
	 */
 	virtual void OnPacketReceive(std::string &data, std::string serv);

	/** Called on rehash.
	 * This method is called prior to a /REHASH or when a SIGHUP is received from the operating
	 * system. You should use it to reload any files so that your module keeps in step with the
	 * rest of the application.
	 */
 	virtual void OnRehash();

	/** Called when a raw command is transmitted or received.
	 * This method is the lowest level of handler available to a module. It will be called with raw
	 * data which is passing through a connected socket. If you wish, you may munge this data by changing
	 * the string parameter "raw". If you do this, after your function exits it will immediately be
	 * cut down to 510 characters plus a carriage return and linefeed. For INBOUND messages only (where
	 * inbound is set to true) the value of user will be the userrec of the connection sending the
	 * data. This is not possible for outbound data because the data may be being routed to multiple targets.
	 */
 	virtual void OnServerRaw(std::string &raw, bool inbound, userrec* user);

	/** Called whenever an extended mode is to be processed.
	 * The type parameter is MT_SERVER, MT_CLIENT or MT_CHANNEL, dependent on where the mode is being
	 * changed. mode_on is set when the mode is being set, in which case params contains a list of
	 * parameters for the mode as strings. If mode_on is false, the mode is being removed, and parameters
	 * may contain the parameters for the mode, dependent on wether they were defined when a mode handler
 	 * was set up with Server::AddExtendedMode
 	 * If the mode is a channel mode, target is a chanrec*, and if it is a user mode, target is a userrec*.
 	 * You must cast this value yourself to make use of it.
	 */
 	virtual int OnExtendedMode(userrec* user, void* target, char modechar, int type, bool mode_on, string_list &params);
 	
	/** Called whenever a user is about to join a channel, before any processing is done.
	 * Returning a value of 1 from this function stops the process immediately, causing no
	 * output to be sent to the user by the core. If you do this you must produce your own numerics,
	 * notices etc. This is useful for modules which may want to mimic +b, +k, +l etc. Returning -1 from
	 * this function forces the join to be allowed, bypassing restrictions such as banlists, invite, keys etc.
	 *
	 * IMPORTANT NOTE!
	 *
	 * If the user joins a NEW channel which does not exist yet, OnUserPreJoin will be called BEFORE the channel
	 * record is created. This will cause chanrec* chan to be NULL. There is very little you can do in form of
	 * processing on the actual channel record at this point, however the channel NAME will still be passed in
	 * char* cname, so that you could for example implement a channel blacklist or whitelist, etc.
	 */
	virtual int OnUserPreJoin(userrec* user, chanrec* chan, const char* cname);
	
        /** Called whenever a user is about to be kicked.
         * Returning a value of 1 from this function stops the process immediately, causing no
         * output to be sent to the user by the core. If you do this you must produce your own numerics,
         * notices etc.
         */
	virtual int OnUserPreKick(userrec* source, userrec* user, chanrec* chan, std::string reason);

	/** Called whenever a user is kicked.
	 * If this method is called, the kick is already underway and cannot be prevented, so
	 * to prevent a kick, please use Module::OnUserPreKick instead of this method.
	 */
	virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, std::string reason);

	/** Called whenever a user opers locally.
	 * The userrec will contain the oper mode 'o' as this function is called after any modifications
	 * are made to the user's structure by the core.
	 */
	virtual void OnOper(userrec* user);
	
	/** Called whenever a user types /INFO.
	 * The userrec will contain the information of the user who typed the command. Modules may use this
	 * method to output their own credits in /INFO (which is the ircd's version of an about box).
	 * It is purposefully not possible to modify any info that has already been output, or halt the list.
	 * You must write a 371 numeric to the user, containing your info in the following format:
	 *
	 * &lt;nick&gt; :information here
	 */
	virtual void OnInfo(userrec* user);
	
	/** Called whenever a /WHOIS is performed on a local user.
	 * The source parameter contains the details of the user who issued the WHOIS command, and
	 * the dest parameter contains the information of the user they are whoising.
	 */
	virtual void OnWhois(userrec* source, userrec* dest);
	
	/** Called whenever a user is about to invite another user into a channel, before any processing is done.
	 * Returning 1 from this function stops the process immediately, causing no
	 * output to be sent to the user by the core. If you do this you must produce your own numerics,
	 * notices etc. This is useful for modules which may want to filter invites to channels.
	 */
	virtual int OnUserPreInvite(userrec* source,userrec* dest,chanrec* channel);
	
	/** Called whenever a user is about to PRIVMSG A user or a channel, before any processing is done.
	 * Returning any nonzero value from this function stops the process immediately, causing no
	 * output to be sent to the user by the core. If you do this you must produce your own numerics,
	 * notices etc. This is useful for modules which may want to filter or redirect messages.
	 * target_type can be one of TYPE_USER or TYPE_CHANNEL. If the target_type value is a user,
	 * you must cast dest to a userrec* otherwise you must cast it to a chanrec*, this is the details
	 * of where the message is destined to be sent.
	 */
	virtual int OnUserPreMessage(userrec* user,void* dest,int target_type, std::string &text);

	/** Called whenever a user is about to NOTICE A user or a channel, before any processing is done.
	 * Returning any nonzero value from this function stops the process immediately, causing no
	 * output to be sent to the user by the core. If you do this you must produce your own numerics,
	 * notices etc. This is useful for modules which may want to filter or redirect messages.
	 * target_type can be one of TYPE_USER or TYPE_CHANNEL. If the target_type value is a user,
	 * you must cast dest to a userrec* otherwise you must cast it to a chanrec*, this is the details
	 * of where the message is destined to be sent.
	 * You may alter the message text as you wish before relinquishing control to the next module
	 * in the chain, and if no other modules block the text this altered form of the text will be sent out
	 * to the user and possibly to other servers.
	 */
	virtual int OnUserPreNotice(userrec* user,void* dest,int target_type, std::string &text);
	
	/** Called before any nickchange, local or remote. This can be used to implement Q-lines etc.
	 * Please note that although you can see remote nickchanges through this function, you should
	 * NOT make any changes to the userrec if the user is a remote user as this may cause a desnyc.
	 * check user->server before taking any action (including returning nonzero from the method).
	 * If your method returns nonzero, the nickchange is silently forbidden, and it is down to your
	 * module to generate some meaninful output.
	 */
	virtual int OnUserPreNick(userrec* user, std::string newnick);
	
	/** Called after any nickchange, local or remote. This can be used to track users after nickchanges
	 * have been applied. Please note that although you can see remote nickchanges through this function, you should
         * NOT make any changes to the userrec if the user is a remote user as this may cause a desnyc.
         * check user->server before taking any action (including returning nonzero from the method).
	 * Because this method is called after the nickchange is taken place, no return values are possible
	 * to indicate forbidding of the nick change. Use OnUserPreNick for this.
         */
	virtual void OnUserPostNick(userrec* user, std::string oldnick);

	/** Called before an action which requires a channel privilage check.
	 * This function is called before many functions which check a users status on a channel, for example
	 * before opping a user, deopping a user, kicking a user, etc.
	 * There are several values for access_type which indicate for what reason access is being checked.
	 * These are:<br><br>
	 * AC_KICK (0) - A user is being kicked<br>
	 * AC_DEOP (1) - a user is being deopped<br>
	 * AC_OP (2) - a user is being opped<br>
	 * AC_VOICE (3) - a user is being voiced<br>
	 * AC_DEVOICE (4) - a user is being devoiced<br>
	 * AC_HALFOP (5) - a user is being halfopped<br>
	 * AC_DEHALFOP (6) - a user is being dehalfopped<br>
	 * AC_INVITE (7) - a user is being invited<br>
	 * AC_GENERAL_MODE (8) - a user channel mode is being changed<br><br>
	 * Upon returning from your function you must return either ACR_DEFAULT, to indicate the module wishes
	 * to do nothing, or ACR_DENY where approprate to deny the action, and ACR_ALLOW where appropriate to allow
	 * the action. Please note that in the case of some access checks (such as AC_GENERAL_MODE) access may be
	 * denied 'upstream' causing other checks such as AC_DEOP to not be reached. Be very careful with use of the
	 * AC_GENERAL_MODE type, as it may inadvertently override the behaviour of other modules. When the access_type
	 * is AC_GENERAL_MODE, the destination of the mode will be NULL (as it has not yet been determined).
	 */
	virtual int OnAccessCheck(userrec* source,userrec* dest,chanrec* channel,int access_type);

	/** Called during a netburst to sync user data.
	 * This is called during the netburst on a per-user basis. You should use this call to up any special
	 * user-related things which are implemented by your module, e.g. sending listmodes. You may return
	 * multiple commands in the string_list.
	 */
	virtual string_list OnUserSync(userrec* user);

	/** Called during a netburst to sync channel data.
	 * This is called during the netburst on a per-channel basis. You should use this call to up any special
	 * channel-related things which are implemented by your module, e.g. sending listmodes. You may return
	 * multiple commands in the string_list.
	 */
	virtual string_list OnChannelSync(chanrec* chan);

	/** Called when a 005 numeric is about to be output.
	 * The module should modify the 005 numeric if needed to indicate its features.
	 */
	virtual void On005Numeric(std::string &output);

	/** Called when a client is disconnected by KILL.
	 * If a client is killed by a server, e.g. a nickname collision or protocol error,
	 * source is NULL.
	 * Return 1 from this function to prevent the kill, and 0 from this function to allow
	 * it as normal. If you prevent the kill no output will be sent to the client, it is
	 * down to your module to generate this information.
	 * NOTE: It is NOT advisable to stop kills which originate from servers. If you do
	 * so youre risking race conditions, desyncs and worse!
	 */
	virtual int OnKill(userrec* source, userrec* dest, std::string reason);

	/** Called whenever a module is loaded.
	 * mod will contain a pointer to the module, and string will contain its name,
	 * for example m_widgets.so. This function is primary for dependency checking,
	 * your module may decide to enable some extra features if it sees that you have
	 * for example loaded "m_killwidgets.so" with "m_makewidgets.so". It is highly
	 * recommended that modules do *NOT* bail if they cannot satisfy dependencies,
	 * but instead operate under reduced functionality, unless the dependency is
	 * absolutely neccessary (e.g. a module that extends the features of another
	 * module).
	 */
	virtual void OnLoadModule(Module* mod,std::string name);

	/** Called once every five seconds for background processing.
	 * This timer can be used to control timed features. Its period is not accurate
	 * enough to be used as a clock, but it is gauranteed to be called at least once in
	 * any five second period, directly from the main loop of the server.
	 */
	virtual void OnBackgroundTimer(time_t curtime);

	/** Called whenever a list is needed for a listmode.
	 * For example, when a /MODE #channel +b (without any other parameters) is called,
	 * if a module was handling +b this function would be called. The function can then
	 * output any lists it wishes to. Please note that all modules will see all mode
	 * characters to provide the ability to extend each other, so please only output
	 * a list if the mode character given matches the one(s) you want to handle.
	 */
	virtual void OnSendList(userrec* user, chanrec* channel, char mode);

	/** Called whenever any command is about to be executed.
	 * This event occurs for all registered commands, wether they are registered in the core,
	 * or another module, but it will not occur for invalid commands (e.g. ones which do not
	 * exist within the command table). By returning 1 from this method you may prevent the
	 * command being executed. If you do this, no output is created by the core, and it is
	 * down to your module to produce any output neccessary.
	 * Note that unless you return 1, you should not destroy any structures (e.g. by using
	 * Server::QuitUser) otherwise when the command's handler function executes after your
	 * method returns, it will be passed an invalid pointer to the user object and crash!)
	 */
	virtual int OnPreCommand(std::string command, char **parameters, int pcnt, userrec *user);

	/** Called to check if a user who is connecting can now be allowed to register
	 * If any modules return false for this function, the user is held in the waiting
	 * state until all modules return true. For example a module which implements ident
	 * lookups will continue to return false for a user until their ident lookup is completed.
	 * Note that the registration timeout for a user overrides these checks, if the registration
	 * timeout is reached, the user is disconnected even if modules report that the user is
	 * not ready to connect.
	 */
	virtual bool OnCheckReady(userrec* user);

	/** Called whenever a user is about to register their connection (e.g. before the user
	 * is sent the MOTD etc). Modules can use this method if they are performing a function
	 * which must be done before the actual connection is completed (e.g. ident lookups,
	 * dnsbl lookups, etc).
	 * Note that you should NOT delete the user record here by causing a disconnection!
	 * Use OnUserConnect for that instead.
	 */
	virtual void OnUserRegister(userrec* user);

	/** Called whenever a mode character is processed.
	 * Return 1 from this function to block the mode character from being processed entirely,
	 * so that you may perform your own code instead. Note that this method allows you to override
	 * modes defined by other modes, but this is NOT RECOMMENDED!
	 */
	virtual int OnRawMode(userrec* user, chanrec* chan, char mode, std::string param, bool adding, int pcnt);

	/** Called whenever a user joins a channel, to determine if invite checks should go ahead or not.
	 * This method will always be called for each join, wether or not the channel is actually +i, and
	 * determines the outcome of an if statement around the whole section of invite checking code.
	 * return 1 to explicitly allow the join to go ahead or 0 to ignore the event.
	 */
	virtual int OnCheckInvite(userrec* user, chanrec* chan);

        /** Called whenever a user joins a channel, to determine if key checks should go ahead or not.
         * This method will always be called for each join, wether or not the channel is actually +k, and
         * determines the outcome of an if statement around the whole section of key checking code.
	 * if the user specified no key, the keygiven string will be a valid but empty value.
         * return 1 to explicitly allow the join to go ahead or 0 to ignore the event.
         */
	virtual int OnCheckKey(userrec* user, chanrec* chan, std::string keygiven);

        /** Called whenever a user joins a channel, to determine if channel limit checks should go ahead or not.
         * This method will always be called for each join, wether or not the channel is actually +l, and
         * determines the outcome of an if statement around the whole section of channel limit checking code.
         * return 1 to explicitly allow the join to go ahead or 0 to ignore the event.
         */
	virtual int OnCheckLimit(userrec* user, chanrec* chan);

        /** Called whenever a user joins a channel, to determine if banlist checks should go ahead or not.
         * This method will always be called for each join, wether or not the user actually matches a channel ban, and
         * determines the outcome of an if statement around the whole section of ban checking code.
         * return 1 to explicitly allow the join to go ahead or 0 to ignore the event.
         */
	virtual int OnCheckBan(userrec* user, chanrec* chan);

	/** Called on all /STATS commands
	 * This method is triggered for all /STATS use, including stats symbols handled by the core.
	 */
	virtual void OnStats(char symbol);

	/** Called whenever a change of a local users displayed host is attempted.
	 * Return 1 to deny the host change, or 0 to allow it.
	 */
	virtual int OnChangeLocalUserHost(userrec* user, std::string newhost);

	/** Called whenever a change of a local users GECOS (fullname field) is attempted.
	 * return 1 to deny the name change, or 0 to allow it.
	 */
	virtual int OnChangeLocalUserGECOS(userrec* user, std::string newhost); 

	/** Called whenever a topic is changed by a local user.
	 * Return 1 to deny the topic change, or 0 to allow it.
	 */
	virtual int OnLocalTopicChange(userrec* user, chanrec* chan, std::string topic);

	/** Called whenever an unknown token is received in a server to server link.
	 * The token value is the unknown token -- please check that no other modules are using the token
	 * that you use. Returning 1 supresses the 'unknown token type' error which is usually sent to
	 * all opers with +s. The params list is a list of parameters, and if any parameters start with a
	 * colon (:) it is treated as the whole of the last parameter, identical to how RFC messages are
	 * handled. source is the sender of the message, and reply is what should be replied to for a unicast
	 * message. Note that there are not many messages in the mesh protocol which require unicast
	 * messaging. tcp_host is the server name as a string, ipaddr is its ip address in dotted decimal
	 * notation and port is the port number it is using.
	 */
	virtual int OnMeshToken(char token,string_list params,serverrec* source,serverrec* reply, std::string tcp_host,std::string ipaddr,int port);

	/** Called whenever an Event class is sent to all module by another module.
	 * Please see the documentation of Event::Send() for further information. The Event sent can
	 * always be assumed to be non-NULL, you should *always* check the value of Event::GetEventID()
	 * before doing anything to the event data, and you should *not* change the event data in any way!
	 */
	virtual void OnEvent(Event* event);

	/** Called whenever a Request class is sent to your module by another module.
	 * Please see the documentation of Request::Send() for further information. The Request sent
	 * can always be assumed to be non-NULL, you should not change the request object or its data.
	 * Your method may return arbitary data in the char* result which the requesting module
	 * may be able to use for pre-determined purposes (e.g. the results of an SQL query, etc).
	 */
	virtual char* OnRequest(Request* request);

	/** Called whenever an oper password is to be compared to what a user has input.
	 * The password field (from the config file) is in 'password' and is to be compared against
	 * 'input'. This method allows for encryption of oper passwords and much more besides.
	 * You should return a nonzero value if you want to allow the comparison or zero if you wish
	 * to do nothing.
	 */
	virtual int OnOperCompare(std::string password, std::string input);

	/** Called whenever a user is given usermode +o, anywhere on the network.
	 * You cannot override this and prevent it from happening as it is already happened and
	 * such a task must be performed by another server. You can however bounce modes by sending
	 * servermodes out to reverse mode changes.
	 */
	virtual void OnGlobalOper(userrec* user);

	/**  Called whenever a user connects, anywhere on the network.
	 * This event is informational only. You should not change any user information in this
	 * event. To do so, use the OnUserConnect method to change the state of local users.
	 */
	virtual void OnGlobalConnect(userrec* user);

	/** Called whenever a ban is added to a channel's list.
	 * Return a non-zero value to 'eat' the mode change and prevent the ban from being added.
	 */
	virtual int OnAddBan(userrec* source, chanrec* channel,std::string banmask);

	/** Called whenever a ban is removed from a channel's list.
	 * Return a non-zero value to 'eat' the mode change and prevent the ban from being removed.
	 */
	virtual int OnDelBan(userrec* source, chanrec* channel,std::string banmask);

	/** Called immediately after any  connection is accepted. This is intended for raw socket
	 * processing (e.g. modules which wrap the tcp connection within another library) and provides
	 * no information relating to a user record as the connection has not been assigned yet.
	 * There are no return values from this call as all modules get an opportunity if required to
	 * process the connection.
	 */
	virtual void OnRawSocketAccept(int fd, std::string ip, int localport);

	/** Called immediately before any write() operation on a user's socket in the core. Because
	 * this event is a low level event no user information is associated with it. It is intended
	 * for use by modules which may wrap connections within another API such as SSL for example.
	 * return a non-zero result if you have handled the write operation, in which case the core
	 * will not call write().
	 */
	virtual int OnRawSocketWrite(int fd, char* buffer, int count);

	/** Called immediately before any socket is closed. When this event is called, shutdown()
	 * has not yet been called on the socket.
	 */
	virtual void OnRawSocketClose(int fd);

	/** Called immediately before any read() operation on a client socket in the core.
	 * This occurs AFTER the select() or poll() so there is always data waiting to be read
	 * when this event occurs.
	 * Your event should return 1 if it has handled the reading itself, which prevents the core
	 * just using read(). You should place any data read into buffer, up to but NOT GREATER THAN
	 * the value of count. The value of readresult must be identical to an actual result that might
	 * be returned from the read() system call, for example, number of bytes read upon success,
	 * 0 upon EOF or closed socket, and -1 for error. If your function returns a nonzero value,
	 * you MUST set readresult.
	 */
	virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult);
};


/** Allows server output and query functions
 * This class contains methods which allow a module to query the state of the irc server, and produce
 * output to users and other servers. All modules should instantiate at least one copy of this class,
 * and use its member functions to perform their tasks.
 */
class Server : public classbase
{
 public:
	/** Default constructor.
	 * Creates a Server object.
	 */
	Server();
	/** Default destructor.
	 * Destroys a Server object.
	 */
	virtual ~Server();

	/** Sends text to all opers.
	 * This method sends a server notice to all opers with the usermode +s.
	 */
	virtual void SendOpers(std::string s);
	/** Writes a log string.
	 * This method writes a line of text to the log. If the level given is lower than the
	 * level given in the configuration, this command has no effect.
	 */
	virtual void Log(int level, std::string s);
	/** Sends a line of text down a TCP/IP socket.
	 * This method writes a line of text to an established socket, cutting it to 510 characters
	 * plus a carriage return and linefeed if required.
	 */
	virtual void Send(int Socket, std::string s);
	/** Sends text from the server to a socket.
	 * This method writes a line of text to an established socket, with the servername prepended
	 * as used by numerics (see RFC 1459)
	 */
	virtual void SendServ(int Socket, std::string s);
	/** Writes text to a channel, but from a server, including all.
	 * This can be used to send server notices to a group of users.
	 */
	virtual void SendChannelServerNotice(std::string ServName, chanrec* Channel, std::string text);
	/** Sends text from a user to a socket.
	 * This method writes a line of text to an established socket, with the given user's nick/ident
	 * /host combination prepended, as used in PRIVSG etc commands (see RFC 1459)
	 */
	virtual void SendFrom(int Socket, userrec* User, std::string s);
	/** Sends text from a user to another user.
	 * This method writes a line of text to a user, with a user's nick/ident
	 * /host combination prepended, as used in PRIVMSG etc commands (see RFC 1459)
	 * If you specify NULL as the source, then the data will originate from the
	 * local server, e.g. instead of:
	 *
	 * :user!ident@host TEXT
	 *
	 * The format will become:
	 *
	 * :localserver TEXT
	 *
	 * Which is useful for numerics and server notices to single users, etc.
	 */
	virtual void SendTo(userrec* Source, userrec* Dest, std::string s);
	/** Sends text from a user to a channel (mulicast).
	 * This method writes a line of text to a channel, with the given user's nick/ident
	 * /host combination prepended, as used in PRIVMSG etc commands (see RFC 1459). If the
	 * IncludeSender flag is set, then the text is also sent back to the user from which
	 * it originated, as seen in MODE (see RFC 1459).
	 */
	virtual void SendChannel(userrec* User, chanrec* Channel, std::string s,bool IncludeSender);
	/** Returns true if two users share a common channel.
	 * This method is used internally by the NICK and QUIT commands, and the Server::SendCommon
	 * method.
	 */
	virtual bool CommonChannels(userrec* u1, userrec* u2);
	/** Sends text from a user to one or more channels (mulicast).
	 * This method writes a line of text to all users which share a common channel with a given	
	 * user, with the user's nick/ident/host combination prepended, as used in PRIVMSG etc
	 * commands (see RFC 1459). If the IncludeSender flag is set, then the text is also sent
	 * back to the user from which it originated, as seen in NICK (see RFC 1459). Otherwise, it
	 * is only sent to the other recipients, as seen in QUIT.
	 */
	virtual void SendCommon(userrec* User, std::string text,bool IncludeSender);
	/** Sends a WALLOPS message.
	 * This method writes a WALLOPS message to all users with the +w flag, originating from the
	 * specified user.
	 */
	virtual void SendWallops(userrec* User, std::string text);

	/** Returns true if a nick is valid.
	 * Nicks for unregistered connections will return false.
	 */
	virtual bool IsNick(std::string nick);
	/** Returns a count of the number of users on a channel.
	 * This will NEVER be 0, as if the chanrec exists, it will have at least one user in the channel.
	 */
	virtual int CountUsers(chanrec* c);
	/** Attempts to look up a nick and return a pointer to it.
	 * This function will return NULL if the nick does not exist.
	 */
	virtual userrec* FindNick(std::string nick);
	/** Attempts to look up a nick using the file descriptor associated with that nick.
	 * This function will return NULL if the file descriptor is not associated with a valid user.
	 */
	virtual userrec* FindDescriptor(int socket);
	/** Attempts to look up a channel and return a pointer to it.
	 * This function will return NULL if the channel does not exist.
	 */
	virtual chanrec* FindChannel(std::string channel);
	/** Attempts to look up a user's privilages on a channel.
	 * This function will return a string containing either @, %, +, or an empty string,
	 * representing the user's privilages upon the channel you specify.
	 */
	virtual std::string ChanMode(userrec* User, chanrec* Chan);
	/** Checks if a user is on a channel.
	 * This function will return true or false to indicate if user 'User' is on channel 'Chan'.
	 */
	virtual bool IsOnChannel(userrec* User, chanrec* Chan);
	/** Returns the server name of the server where the module is loaded.
	 */
	virtual std::string GetServerName();
	/** Returns the network name, global to all linked servers.
	 */
	virtual std::string GetNetworkName();
	/** Returns the server description string of the local server
	 */
	virtual std::string GetServerDescription();
	/** Returns the information of the server as returned by the /ADMIN command.
	 * See the Admin class for further information of the return value. The members
	 * Admin::Nick, Admin::Email and Admin::Name contain the information for the
	 * server where the module is loaded.
	 */
	virtual Admin GetAdmin();
	/** Adds an extended mode letter which is parsed by a module.
	 * This allows modules to add extra mode letters, e.g. +x for hostcloak.
	 * the "type" parameter is either MT_CHANNEL, MT_CLIENT, or MT_SERVER, to
	 * indicate wether the mode is a channel mode, a client mode, or a server mode.
	 * requires_oper is used with MT_CLIENT type modes only to indicate the mode can only
	 * be set or unset by an oper. If this is used for MT_CHANNEL type modes it is ignored.
	 * params_when_on is the number of modes to expect when the mode is turned on
	 * (for type MT_CHANNEL only), e.g. with mode +k, this would have a value of 1.
	 * the params_when_off value has a similar value to params_when_on, except it indicates
	 * the number of parameters to expect when the mode is disabled. Modes which act in a similar
	 * way to channel mode +l (e.g. require a parameter to enable, but not to disable) should
	 * use this parameter. The function returns false if the mode is unavailable, and will not
	 * attempt to allocate another character, as this will confuse users. This also means that
	 * as only one module can claim a specific mode character, the core does not need to keep track
	 * of which modules own which modes, which speeds up operation of the server. In this version,
	 * a mode can have at most one parameter, attempting to use more parameters will have undefined
	 * effects.
	 */
	virtual bool AddExtendedMode(char modechar, int type, bool requires_oper, int params_when_on, int params_when_off);

	/** Adds an extended mode letter which is parsed by a module and handled in a list fashion.
	 * This call is used to implement modes like +q and +a. The characteristics of these modes are
	 * as follows:
	 *
	 * (1) They are ALWAYS on channels, not on users, therefore their type is MT_CHANNEL
	 *
	 * (2) They always take exactly one parameter when being added or removed
	 *
	 * (3) They can be set multiple times, usually on users in channels
	 *
	 * (4) The mode and its parameter are NOT stored in the channels modes structure
	 *
	 * It is down to the module handling the mode to maintain state and determine what 'items' (e.g. users,
	 * or a banlist) have the mode set on them, and process the modes at the correct times, e.g. during access
	 * checks on channels, etc. When the extended mode is triggered the OnExtendedMode method will be triggered
	 * as above. Note that the target you are given will be a channel, if for example your mode is set 'on a user'
	 * (in for example +a) you must use Server::Find to locate the user the mode is operating on.
	 * Your mode handler may return 1 to handle the mode AND tell the core to display the mode change, e.g.
	 * '+aaa one two three' in the case of the mode for 'two', or it may return -1 to 'eat' the mode change,
	 * so the above example would become '+aa one three' after processing.
	 */
	virtual bool AddExtendedListMode(char modechar);

	/** Adds a command to the command table.
	 * This allows modules to add extra commands into the command table. You must place a function within your
	 * module which is is of type handlerfunc:
	 * 
	 * typedef void (handlerfunc) (char**, int, userrec*);
	 * ...
	 * void handle_kill(char **parameters, int pcnt, userrec *user)
	 *
	 * When the command is typed, the parameters will be placed into the parameters array (similar to argv) and
	 * the parameter count will be placed into pcnt (similar to argv). There will never be any less parameters
	 * than the 'minparams' value you specified when creating the command. The *user parameter is the class of
	 * the user which caused the command to trigger, who will always have the flag you specified in 'flags' when
	 * creating the initial command. For example to create an oper only command create the commands with flags='o'.
	 * The source parameter is used for resource tracking, and should contain the name of your module (with file
	 * extension) e.g. "m_blarp.so". If you place the wrong identifier here, you can cause crashes if your module
	 * is unloaded.
	 */
	virtual void AddCommand(char* cmd, handlerfunc f, char flags, int minparams, char* source);
	 
 	/** Sends a servermode.
 	 * you must format the parameters array with the target, modes and parameters for those modes.
 	 *
 	 * For example:
 	 *
 	 * char *modes[3];
 	 *
	 * modes[0] = ChannelName;
	 *
	 * modes[1] = "+o";
	 *
	 * modes[2] = user->nick;
	 *
	 * Srv->SendMode(modes,3,user);
	 *
	 * The modes will originate from the server where the command was issued, however responses (e.g. numerics)
	 * will be sent to the user you provide as the third parameter.
	 * You must be sure to get the number of parameters correct in the pcnt parameter otherwise you could leave
	 * your server in an unstable state!
	 */

  	virtual void SendMode(char **parameters, int pcnt, userrec *user);
  	
  	/** Sends to all users matching a mode mask
  	 * You must specify one or more usermodes as the first parameter. These can be RFC specified modes such as +i,
  	 * or module provided modes, including ones provided by your own module.
  	 * In the second parameter you must place a flag value which indicates wether the modes you have given will be
  	 * logically ANDed or OR'ed. You may use one of either WM_AND or WM_OR.
  	 * for example, if you were to use:
  	 *
  	 * Serv->SendToModeMask("xi", WM_OR, "m00");
  	 *
  	 * Then the text 'm00' will be sent to all users with EITHER mode x or i. Conversely if you used WM_AND, the
  	 * user must have both modes set to receive the message.
  	 */
  	virtual void SendToModeMask(std::string modes, int flags, std::string text);

	/** Forces a user to join a channel.
	 * This is similar to svsjoin and can be used to implement redirection, etc.
	 * On success, the return value is a valid pointer to a chanrec* of the channel the user was joined to.
	 * On failure, the result is NULL.
	 */
	virtual chanrec* JoinUserToChannel(userrec* user, std::string cname, std::string key);
	
	/** Forces a user to part a channel.
	 * This is similar to svspart and can be used to implement redirection, etc.
	 * Although the return value of this function is a pointer to a channel record, the returned data is
	 * undefined and should not be read or written to. This behaviour may be changed in a future version.
	 */
	virtual chanrec* PartUserFromChannel(userrec* user, std::string cname, std::string reason);
	
	/** Forces a user nickchange.
	 * This command works similarly to SVSNICK, and can be used to implement Q-lines etc.
	 * If you specify an invalid nickname, the nick change will be dropped and the target user will receive
	 * the error numeric for it.
	 */
	virtual void ChangeUserNick(userrec* user, std::string nickname);
	
	/** Forces a user to quit with the specified reason.
	 * To the user, it will appear as if they typed /QUIT themselves, except for the fact that this function
	 * may bypass the quit prefix specified in the config file.
	 *
	 * WARNING!
	 *
	 * Once you call this function, userrec* user will immediately become INVALID. You MUST NOT write to, or
	 * read from this pointer after calling the QuitUser method UNDER ANY CIRCUMSTANCES! The best course of
	 * action after calling this method is to immediately bail from your handler.
	 */
	virtual void QuitUser(userrec* user, std::string reason);
	
	/**  Matches text against a glob pattern.
	 * Uses the ircd's internal matching function to match string against a globbing pattern, e.g. *!*@*.com
	 * Returns true if the literal successfully matches the pattern, false if otherwise.
	 */
	virtual bool MatchText(std::string sliteral, std::string spattern);
	
	/** Calls the handler for a command, either implemented by the core or by another module.
	 * You can use this function to trigger other commands in the ircd, such as PRIVMSG, JOIN,
	 * KICK etc, or even as a method of callback. By defining command names that are untypeable
	 * for users on irc (e.g. those which contain a \r or \n) you may use them as callback identifiers.
	 * The first parameter to this method is the name of the command handler you wish to call, e.g.
	 * PRIVMSG. This will be a command handler previously registered by the core or wih AddCommand().
	 * The second parameter is an array of parameters, and the third parameter is a count of parameters
	 * in the array. If you do not pass enough parameters to meet the minimum needed by the handler, the
	 * functiom will silently ignore it. The final parameter is the user executing the command handler,
	 * used for privilage checks, etc.
	 */
	virtual void CallCommandHandler(std::string commandname, char** parameters, int pcnt, userrec* user);
	
	/** Change displayed hostname of a user.
	 * You should always call this method to change a user's host rather than writing directly to the
	 * dhost member of userrec, as any change applied via this method will be propogated to any
	 * linked servers.
	 */	
	virtual void ChangeHost(userrec* user, std::string host);
	
	/** Change GECOS (fullname) of a user.
	 * You should always call this method to change a user's GECOS rather than writing directly to the
	 * fullname member of userrec, as any change applied via this method will be propogated to any
	 * linked servers.
	 */	
	virtual void ChangeGECOS(userrec* user, std::string gecos);
	
	/** Returns true if the servername you give is ulined.
	 * ULined servers have extra privilages. They are allowed to change nicknames on remote servers,
	 * change modes of clients which are on remote servers and set modes of channels where there are
	 * no channel operators for that channel on the ulined server, amongst other things. Ulined server
	 * data is also broadcast across the mesh at all times as opposed to selectively messaged in the
	 * case of normal servers, as many ulined server types (such as services) do not support meshed
	 * links and must operate in this manner.
	 */
	virtual bool IsUlined(std::string server);
	
	/** Fetches the userlist of a channel. This function must be here and not a member of userrec or
	 * chanrec due to include constraints.
	 */
	virtual chanuserlist GetUsers(chanrec* chan);

	/** Remove a user's connection to the irc server, but leave their client in existence in the
	 * user hash. When you call this function, the user's file descriptor will be replaced with the
	 * value of FD_MAGIC_NUMBER and their old file descriptor will be closed. This idle client will
	 * remain until it is restored with a valid file descriptor, or is removed from IRC by an operator
	 * After this call, the pointer to user will be invalid.
	 */
	virtual bool UserToPseudo(userrec* user,std::string message);

	/** This user takes one user, and switches their file descriptor with another user, so that one user
	 * "becomes" the other. The user in 'alive' is booted off the server with the given message. The user
	 * referred to by 'zombie' should have previously been locked with Server::ZombifyUser, otherwise
	 * stale sockets and file descriptor leaks can occur. After this call, the pointer to alive will be
	 * invalid, and the pointer to zombie will be equivalent in effect to the old pointer to alive.
	 */
	virtual bool PseudoToUser(userrec* alive,userrec* zombie,std::string message);

	/** Adds a G-line
	 * The G-line is propogated to all of the servers in the mesh and enforced as soon as it is added.
	 * The duration must be in seconds, however you can use the Server::CalcDuration method to convert
	 * durations into the 1w2d3h3m6s format used by /GLINE etc. The source is an arbitary string used
	 * to indicate who or what sent the data, usually this is the nickname of a person, or a server
	 * name.
	 */
	virtual void AddGLine(long duration, std::string source, std::string reason, std::string hostmask);

        /** Adds a Q-line
         * The Q-line is propogated to all of the servers in the mesh and enforced as soon as it is added.
         * The duration must be in seconds, however you can use the Server::CalcDuration method to convert
         * durations into the 1w2d3h3m6s format used by /GLINE etc. The source is an arbitary string used
         * to indicate who or what sent the data, usually this is the nickname of a person, or a server
         * name.
         */
	virtual void AddQLine(long duration, std::string source, std::string reason, std::string nickname);

        /** Adds a Z-line
         * The Z-line is propogated to all of the servers in the mesh and enforced as soon as it is added.
         * The duration must be in seconds, however you can use the Server::CalcDuration method to convert
         * durations into the 1w2d3h3m6s format used by /GLINE etc. The source is an arbitary string used
         * to indicate who or what sent the data, usually this is the nickname of a person, or a server
         * name.
         */
	virtual void AddZLine(long duration, std::string source, std::string reason, std::string ipaddr);

        /** Adds a K-line
         * The K-line is enforced as soon as it is added.
         * The duration must be in seconds, however you can use the Server::CalcDuration method to convert
         * durations into the 1w2d3h3m6s format used by /GLINE etc. The source is an arbitary string used
         * to indicate who or what sent the data, usually this is the nickname of a person, or a server
         * name.
         */
	virtual void AddKLine(long duration, std::string source, std::string reason, std::string hostmask);

        /** Adds a E-line
         * The E-line is enforced as soon as it is added.
         * The duration must be in seconds, however you can use the Server::CalcDuration method to convert
         * durations into the 1w2d3h3m6s format used by /GLINE etc. The source is an arbitary string used
         * to indicate who or what sent the data, usually this is the nickname of a person, or a server
         * name.
         */
	virtual void AddELine(long duration, std::string source, std::string reason, std::string hostmask);

	/** Deletes a G-Line from all servers on the mesh
	 */
	virtual bool DelGLine(std::string hostmask);

	/** Deletes a Q-Line from all servers on the mesh
	 */
	virtual bool DelQLine(std::string nickname);

	/** Deletes a Z-Line from all servers on the mesh
	 */
	virtual bool DelZLine(std::string ipaddr);

	/** Deletes a local K-Line
	 */
	virtual bool DelKLine(std::string hostmask);

	/** Deletes a local E-Line
	 */
	virtual bool DelELine(std::string hostmask);

	/** Calculates a duration
	 * This method will take a string containing a formatted duration (e.g. "1w2d") and return its value
	 * as a total number of seconds. This is the same function used internally by /GLINE etc to set
	 * the ban times.
	 */
	virtual long CalcDuration(std::string duration);

	/** Returns true if a nick!ident@host string is correctly formatted, false if otherwise.
	 */
	virtual bool IsValidMask(std::string mask);

	/** Sends a line of text to all connected servers.
	 * If a server is not directly reachable, the core deals with routing the message, and will also
	 * deal with failures transparently.
	 */
	virtual void MeshSendAll(std::string text);

	/** This method sends a line of text to all servers who have users which share common channels with the user you provide.
	 * For example, if user A is on server A, and they are on channels #one and #two, and user B is on server B, and also on
	 * channel #one, but user C is on server C and on neither #one or #two, this function will cause the text to only be
	 * sent to server B. However, if server B is only reachable via C, it will route it to C (you do not have to worry about
	 * this routing, it is done transparently, but its good to know how things work!)
	 */
	virtual void MeshSendCommon(userrec* user, std::string text);

	/** This function is equivalent to Server::MeshSendToAll except it will only route to servers which are directly routable.
	 */
	virtual void MeshSendAllAlive(std::string text);

	/** This function sends a line of text directly to a server.
	 * If the server is not directly routable at this time, the server attempts to route text through the mesh.
	 */
	virtual void MeshSendUnicast(std::string destination, std::string text);

	/** This function sends to all servers EXCEPT the one you specify.
	 * You should usually use this function to send messages, specifying the SENDER of your message as 'target'.
	 * This will prevent message loops.
	 */
	virtual void MeshSendAllExcept(std::string target, std::string text);

	/** This function is used to check if any users on channel c are on server servername.
	 * This is used internally by PRIVMSG etc. You should not need to use it.
	 */
	virtual bool MeshCheckChan(chanrec *c,std::string servername);

	/** This function is used to check if user u has any channels in common with users on servername.
	 * This is used internally by Server::MeshSendCommon. You should very rarely need to use it.
	 */
	virtual bool MeshCheckCommon(userrec* u,std::string servername);

	/** This function finds a module by name.
	 * You must provide the filename of the module. If the module cannot be found (is not loaded)
	 * the function will return NULL.
	 */
	virtual Module* FindModule(std::string name);
};


#define CONF_NOT_A_NUMBER	0x000010
#define CONF_NOT_UNSIGNED	0x000080
#define CONF_VALUE_NOT_FOUND	0x000100
#define CONF_FILE_NOT_FOUND	0x000200


/** Allows reading of values from configuration files
 * This class allows a module to read from either the main configuration file (inspircd.conf) or from
 * a module-specified configuration file. It may either be instantiated with one parameter or none.
 * Constructing the class using one parameter allows you to specify a path to your own configuration
 * file, otherwise, inspircd.conf is read.
 */
class ConfigReader : public classbase
{
  protected:
	/** The contents of the configuration file
	 * This protected member should never be accessed by a module (and cannot be accessed unless the
	 * core is changed). It will contain a pointer to the configuration file data with unneeded data
	 * (such as comments) stripped from it.
	 */
	std::stringstream *cache;
	std::stringstream *errorlog;
	/** Used to store errors
	 */
	bool readerror;
	long error;
	
  public:
	/** Default constructor.
	 * This constructor initialises the ConfigReader class to read the inspircd.conf file
	 * as specified when running ./configure.
	 */
	ConfigReader(); 		// default constructor reads ircd.conf
	/** Overloaded constructor.
	 * This constructor initialises the ConfigReader class to read a user-specified config file
	 */
	ConfigReader(std::string filename);	// read a module-specific config
	/** Default destructor.
	 * This method destroys the ConfigReader class.
	 */
	~ConfigReader();
	/** Retrieves a value from the config file.
	 * This method retrieves a value from the config file. Where multiple copies of the tag
	 * exist in the config file, index indicates which of the values to retrieve.
	 */
	std::string ReadValue(std::string tag, std::string name, int index);
	/** Retrieves a boolean value from the config file.
	 * This method retrieves a boolean value from the config file. Where multiple copies of the tag
	 * exist in the config file, index indicates which of the values to retrieve. The values "1", "yes"
	 * and "true" in the config file count as true to ReadFlag, and any other value counts as false.
	 */
	bool ReadFlag(std::string tag, std::string name, int index);
	/** Retrieves an integer value from the config file.
	 * This method retrieves an integer value from the config file. Where multiple copies of the tag
	 * exist in the config file, index indicates which of the values to retrieve. Any invalid integer
	 * values in the tag will cause the objects error value to be set, and any call to GetError() will
	 * return CONF_INVALID_NUMBER to be returned. needs_unsigned is set if the number must be unsigned.
	 * If a signed number is placed into a tag which is specified unsigned, 0 will be returned and GetError()
	 * will return CONF_NOT_UNSIGNED
	 */
	long ReadInteger(std::string tag, std::string name, int index, bool needs_unsigned);
	/** Returns the last error to occur.
	 * Valid errors can be found by looking in modules.h. Any nonzero value indicates an error condition.
	 * A call to GetError() resets the error flag back to 0.
	 */
	long GetError();
	/** Counts the number of times a given tag appears in the config file.
	 * This method counts the number of times a tag appears in a config file, for use where
	 * there are several tags of the same kind, e.g. with opers and connect types. It can be
	 * used with the index value of ConfigReader::ReadValue to loop through all copies of a
	 * multiple instance tag.
	 */
	int Enumerate(std::string tag);
	/** Returns true if a config file is valid.
	 * This method is partially implemented and will only return false if the config
	 * file does not exist or could not be opened.
	 */
	bool Verify();
	/** Dumps the list of errors in a config file to an output location. If bail is true,
	 * then the program will abort. If bail is false and user points to a valid user
	 * record, the error report will be spooled to the given user by means of NOTICE.
	 * if bool is false AND user is false, the error report will be spooled to all opers
	 * by means of a NOTICE to all opers.
	 */
	void DumpErrors(bool bail,userrec* user);

	/** Returns the number of items within a tag.
	 * For example if the tag was &lt;test tag="blah" data="foo"&gt; then this
	 * function would return 2. Spaces and newlines both qualify as valid seperators
	 * between values.
	 */
	int EnumerateValues(std::string tag, int index);
};



/** Caches a text file into memory and can be used to retrieve lines from it.
 * This class contains methods for read-only manipulation of a text file in memory.
 * Either use the constructor type with one parameter to load a file into memory
 * at construction, or use the LoadFile method to load a file.
 */
class FileReader : public classbase
{
 file_cache fc;
 public:
	 /** Default constructor.
	  * This method does not load any file into memory, you must use the LoadFile method
	  * after constructing the class this way.
	  */
	 FileReader();

	 /** Secondary constructor.
	  * This method initialises the class with a file loaded into it ready for GetLine and
	  * and other methods to be called. If the file could not be loaded, FileReader::FileSize
	  * returns 0.
	  */
	 FileReader(std::string filename);

	 /** Default destructor.
	  * This deletes the memory allocated to the file.
	  */
	 ~FileReader();

	 /** Used to load a file.
	  * This method loads a file into the class ready for GetLine and
	  * and other methods to be called. If the file could not be loaded, FileReader::FileSize
	  * returns 0.
	  */
	 void LoadFile(std::string filename);

	 /** Returns true if the file exists
	  * This function will return false if the file could not be opened.
	  */
	 bool Exists();
	 
	 /** Retrieve one line from the file.
	  * This method retrieves one line from the text file. If an empty non-NULL string is returned,
	  * the index was out of bounds, or the line had no data on it.
	  */
	 std::string GetLine(int x);

	 /** Returns the size of the file in lines.
	  * This method returns the number of lines in the read file. If it is 0, no lines have been
	  * read into memory, either because the file is empty or it does not exist, or cannot be
	  * opened due to permission problems.
	  */
	 int FileSize();
};


/** Instantiates classes inherited from Module
 * This class creates a class inherited from type Module, using new. This is to allow for modules
 * to create many different variants of Module, dependent on architecture, configuration, etc.
 * In most cases, the simple class shown in the example module m_foobar.so will suffice for most
 * modules.
 */
class ModuleFactory : public classbase
{
 public:
	ModuleFactory() { }
	virtual ~ModuleFactory() { }
	/** Creates a new module.
	 * Your inherited class of ModuleFactory must return a pointer to your Module class
	 * using this method.
	 */
	virtual Module * CreateModule() = 0;
};


typedef DLLFactory<ModuleFactory> ircd_module;

#endif