summaryrefslogtreecommitdiff
path: root/src/network/network_client.cpp
blob: 9a2608536f4c9384c86035f9dd811fb23588179a (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
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file network_client.cpp Client part of the network protocol. */

#ifdef ENABLE_NETWORK

#include "../stdafx.h"
#include "../debug.h"
#include "network_internal.h"
#include "network_gui.h"
#include "../saveload/saveload.h"
#include "../command_func.h"
#include "../console_func.h"
#include "../fileio_func.h"
#include "../3rdparty/md5/md5.h"
#include "../strings_func.h"
#include "../window_func.h"
#include "../company_func.h"
#include "../company_base.h"
#include "../company_gui.h"
#include "../rev.h"
#include "network.h"
#include "network_base.h"

#include "table/strings.h"

/* This file handles all the client-commands */


/* So we don't make too much typos ;) */
#define MY_CLIENT NetworkClientSocket::Get(0)

static uint32 last_ack_frame;

/** One bit of 'entropy' used to generate a salt for the company passwords. */
static uint32 _password_game_seed;
/** The other bit of 'entropy' used to generate a salt for the company passwords. */
static char _password_server_id[NETWORK_SERVER_ID_LENGTH];

/** Maximum number of companies of the currently joined server. */
static uint8 _network_server_max_companies;
/** Maximum number of spectators of the currently joined server. */
static uint8 _network_server_max_spectators;

/** Who would we like to join as. */
CompanyID _network_join_as;

/** Login password from -p argument */
const char *_network_join_server_password = NULL;
/** Company password from -P argument */
const char *_network_join_company_password = NULL;

/** Make sure the server ID length is the same as a md5 hash. */
assert_compile(NETWORK_SERVER_ID_LENGTH == 16 * 2 + 1);

/**
 * Generates a hashed password for the company name.
 * @param password the password to 'encrypt'.
 * @return the hashed password.
 */
static const char *GenerateCompanyPasswordHash(const char *password)
{
	if (StrEmpty(password)) return password;

	char salted_password[NETWORK_SERVER_ID_LENGTH];

	memset(salted_password, 0, sizeof(salted_password));
	snprintf(salted_password, sizeof(salted_password), "%s", password);
	/* Add the game seed and the server's ID as the salt. */
	for (uint i = 0; i < NETWORK_SERVER_ID_LENGTH - 1; i++) salted_password[i] ^= _password_server_id[i] ^ (_password_game_seed >> i);

	Md5 checksum;
	uint8 digest[16];
	static char hashed_password[NETWORK_SERVER_ID_LENGTH];

	/* Generate the MD5 hash */
	checksum.Append((const uint8*)salted_password, sizeof(salted_password) - 1);
	checksum.Finish(digest);

	for (int di = 0; di < 16; di++) sprintf(hashed_password + di * 2, "%02x", digest[di]);
	hashed_password[lengthof(hashed_password) - 1] = '\0';

	return hashed_password;
}

/**
 * Hash the current company password; used when the server 'company' sets his/her password.
 */
void HashCurrentCompanyPassword(const char *password)
{
	_password_game_seed = _settings_game.game_creation.generation_seed;
	strecpy(_password_server_id, _settings_client.network.network_id, lastof(_password_server_id));

	const char *new_pw = GenerateCompanyPasswordHash(password);
	strecpy(_network_company_states[_local_company].password, new_pw, lastof(_network_company_states[_local_company].password));

	if (_network_server) {
		NetworkServerUpdateCompanyPassworded(_local_company, !StrEmpty(_network_company_states[_local_company].password));
	}
}


/***********
 * Sending functions
 *   DEF_CLIENT_SEND_COMMAND has no parameters
 ************/

DEF_CLIENT_SEND_COMMAND(PACKET_CLIENT_COMPANY_INFO)
{
	/*
	 * Packet: CLIENT_COMPANY_INFO
	 * Function: Request company-info (in detail)
	 * Data:
	 *    <none>
	 */
	Packet *p;
	_network_join_status = NETWORK_JOIN_STATUS_GETTING_COMPANY_INFO;
	SetWindowDirty(WC_NETWORK_STATUS_WINDOW, 0);

	p = new Packet(PACKET_CLIENT_COMPANY_INFO);
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND(PACKET_CLIENT_JOIN)
{
	/*
	 * Packet: CLIENT_JOIN
	 * Function: Try to join the server
	 * Data:
	 *    String: OpenTTD Revision (norev000 if no revision)
	 *    String: Client Name (max NETWORK_NAME_LENGTH)
	 *    uint8:  Play as Company id (1..MAX_COMPANIES)
	 *    uint8:  Language ID
	 */

	Packet *p;
	_network_join_status = NETWORK_JOIN_STATUS_AUTHORIZING;
	SetWindowDirty(WC_NETWORK_STATUS_WINDOW, 0);

	p = new Packet(PACKET_CLIENT_JOIN);
	p->Send_string(_openttd_revision);
	p->Send_string(_settings_client.network.client_name); // Client name
	p->Send_uint8 (_network_join_as);     // PlayAs
	p->Send_uint8 (NETLANG_ANY);          // Language
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND(PACKET_CLIENT_NEWGRFS_CHECKED)
{
	/*
	 * Packet: CLIENT_NEWGRFS_CHECKED
	 * Function: Tell the server that we have the required GRFs
	 * Data:
	 */

	Packet *p = new Packet(PACKET_CLIENT_NEWGRFS_CHECKED);
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_PASSWORD)(NetworkPasswordType type, const char *password)
{
	/*
	 * Packet: CLIENT_PASSWORD
	 * Function: Send a password to the server to authorize
	 * Data:
	 *    uint8:  NetworkPasswordType
	 *    String: Password
	 */
	Packet *p = new Packet(PACKET_CLIENT_PASSWORD);
	p->Send_uint8 (type);
	p->Send_string(type == NETWORK_GAME_PASSWORD ? password : GenerateCompanyPasswordHash(password));
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND(PACKET_CLIENT_GETMAP)
{
	/*
	 * Packet: CLIENT_GETMAP
	 * Function: Request the map from the server
	 * Data:
	 *    <none>
	 */

	Packet *p = new Packet(PACKET_CLIENT_GETMAP);
	/* Send the OpenTTD version to the server, let it validate it too.
	 * But only do it for stable releases because of those we are sure
	 * that everybody has the same NewGRF version. For trunk and the
	 * branches we make tarballs of the OpenTTDs compiled from tarball
	 * will have the lower bits set to 0. As such they would become
	 * incompatible, which we would like to prevent by this. */
	if (HasBit(_openttd_newgrf_version, 19)) p->Send_uint32(_openttd_newgrf_version);
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND(PACKET_CLIENT_MAP_OK)
{
	/*
	 * Packet: CLIENT_MAP_OK
	 * Function: Tell the server that we are done receiving/loading the map
	 * Data:
	 *    <none>
	 */

	Packet *p = new Packet(PACKET_CLIENT_MAP_OK);
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND(PACKET_CLIENT_ACK)
{
	/*
	 * Packet: CLIENT_ACK
	 * Function: Tell the server we are done with this frame
	 * Data:
	 *    uint32: current FrameCounter of the client
	 */

	Packet *p = new Packet(PACKET_CLIENT_ACK);

	p->Send_uint32(_frame_counter);
	MY_CLIENT->Send_Packet(p);
}

/* Send a command packet to the server */
DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_COMMAND)(const CommandPacket *cp)
{
	/*
	 * Packet: CLIENT_COMMAND
	 * Function: Send a DoCommand to the Server
	 * Data:
	 *    uint8:  CompanyID (0..MAX_COMPANIES-1)
	 *    uint32: CommandID (see command.h)
	 *    uint32: P1 (free variables used in DoCommand)
	 *    uint32: P2
	 *    uint32: Tile
	 *    string: text
	 *    uint8:  CallBackID
	 */

	Packet *p = new Packet(PACKET_CLIENT_COMMAND);
	MY_CLIENT->Send_Command(p, cp);

	MY_CLIENT->Send_Packet(p);
}

/* Send a chat-packet over the network */
DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_CHAT)(NetworkAction action, DestType type, int dest, const char *msg, int64 data)
{
	/*
	 * Packet: CLIENT_CHAT
	 * Function: Send a chat-packet to the serve
	 * Data:
	 *    uint8:  ActionID (see network_data.h, NetworkAction)
	 *    uint8:  Destination Type (see network_data.h, DestType);
	 *    uint32: Destination CompanyID/Client-identifier
	 *    String: Message (max NETWORK_CHAT_LENGTH)
	 *    uint64: Some arbitrary number
	 */

	Packet *p = new Packet(PACKET_CLIENT_CHAT);

	p->Send_uint8 (action);
	p->Send_uint8 (type);
	p->Send_uint32(dest);
	p->Send_string(msg);
	p->Send_uint64(data);

	MY_CLIENT->Send_Packet(p);
}

/* Send an error-packet over the network */
DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_ERROR)(NetworkErrorCode errorno)
{
	/*
	 * Packet: CLIENT_ERROR
	 * Function: The client made an error and is quiting the game
	 * Data:
	 *    uint8:  ErrorID (see network_data.h, NetworkErrorCode)
	 */
	Packet *p = new Packet(PACKET_CLIENT_ERROR);

	p->Send_uint8(errorno);
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_SET_PASSWORD)(const char *password)
{
	/*
	 * Packet: PACKET_CLIENT_SET_PASSWORD
	 * Function: Set the password for the clients current company
	 * Data:
	 *    String: Password
	 */
	Packet *p = new Packet(PACKET_CLIENT_SET_PASSWORD);

	p->Send_string(GenerateCompanyPasswordHash(password));
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_SET_NAME)(const char *name)
{
	/*
	 * Packet: PACKET_CLIENT_SET_NAME
	 * Function: Gives the client a new name
	 * Data:
	 *    String: Name
	 */
	Packet *p = new Packet(PACKET_CLIENT_SET_NAME);

	p->Send_string(name);
	MY_CLIENT->Send_Packet(p);
}

/* Send an quit-packet over the network */
DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_QUIT)()
{
	/*
	 * Packet: CLIENT_QUIT
	 * Function: The client is quiting the game
	 * Data:
	 */
	Packet *p = new Packet(PACKET_CLIENT_QUIT);

	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_RCON)(const char *pass, const char *command)
{
	Packet *p = new Packet(PACKET_CLIENT_RCON);
	p->Send_string(pass);
	p->Send_string(command);
	MY_CLIENT->Send_Packet(p);
}

DEF_CLIENT_SEND_COMMAND_PARAM(PACKET_CLIENT_MOVE)(CompanyID company, const char *pass)
{
	Packet *p = new Packet(PACKET_CLIENT_MOVE);
	p->Send_uint8(company);
	p->Send_string(GenerateCompanyPasswordHash(pass));
	MY_CLIENT->Send_Packet(p);
}


/***********
 * Receiving functions
 *   DEF_CLIENT_RECEIVE_COMMAND has parameter: Packet *p
 ************/

extern bool SafeSaveOrLoad(const char *filename, int mode, GameMode newgm, Subdirectory subdir);
extern StringID _switch_mode_errorstr;

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_FULL)
{
	/* We try to join a server which is full */
	_switch_mode_errorstr = STR_NETWORK_ERROR_SERVER_FULL;
	DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

	return NETWORK_RECV_STATUS_SERVER_FULL;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_BANNED)
{
	/* We try to join a server where we are banned */
	_switch_mode_errorstr = STR_NETWORK_ERROR_SERVER_BANNED;
	DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

	return NETWORK_RECV_STATUS_SERVER_BANNED;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_COMPANY_INFO)
{
	byte company_info_version = p->Recv_uint8();

	if (!MY_CLIENT->HasClientQuit() && company_info_version == NETWORK_COMPANY_INFO_VERSION) {
		/* We have received all data... (there are no more packets coming) */
		if (!p->Recv_bool()) return NETWORK_RECV_STATUS_CLOSE_QUERY;

		CompanyID current = (Owner)p->Recv_uint8();
		if (current >= MAX_COMPANIES) return NETWORK_RECV_STATUS_CLOSE_QUERY;

		NetworkCompanyInfo *company_info = GetLobbyCompanyInfo(current);
		if (company_info == NULL) return NETWORK_RECV_STATUS_CLOSE_QUERY;

		p->Recv_string(company_info->company_name, sizeof(company_info->company_name));
		company_info->inaugurated_year = p->Recv_uint32();
		company_info->company_value    = p->Recv_uint64();
		company_info->money            = p->Recv_uint64();
		company_info->income           = p->Recv_uint64();
		company_info->performance      = p->Recv_uint16();
		company_info->use_password     = p->Recv_bool();
		for (int i = 0; i < NETWORK_VEHICLE_TYPES; i++)
			company_info->num_vehicle[i] = p->Recv_uint16();
		for (int i = 0; i < NETWORK_STATION_TYPES; i++)
			company_info->num_station[i] = p->Recv_uint16();
		company_info->ai               = p->Recv_bool();

		p->Recv_string(company_info->clients, sizeof(company_info->clients));

		SetWindowDirty(WC_NETWORK_WINDOW, 0);

		return NETWORK_RECV_STATUS_OKAY;
	}

	return NETWORK_RECV_STATUS_CLOSE_QUERY;
}

/* This packet contains info about the client (playas and name)
 *  as client we save this in NetworkClientInfo, linked via 'client_id'
 *  which is always an unique number on a server. */
DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_CLIENT_INFO)
{
	NetworkClientInfo *ci;
	ClientID client_id = (ClientID)p->Recv_uint32();
	CompanyID playas = (CompanyID)p->Recv_uint8();
	char name[NETWORK_NAME_LENGTH];

	p->Recv_string(name, sizeof(name));

	if (MY_CLIENT->HasClientQuit()) return NETWORK_RECV_STATUS_CONN_LOST;

	ci = NetworkFindClientInfoFromClientID(client_id);
	if (ci != NULL) {
		if (playas == ci->client_playas && strcmp(name, ci->client_name) != 0) {
			/* Client name changed, display the change */
			NetworkTextMessage(NETWORK_ACTION_NAME_CHANGE, CC_DEFAULT, false, ci->client_name, name);
		} else if (playas != ci->client_playas) {
			/* The client changed from client-player..
			 * Do not display that for now */
		}

		ci->client_playas = playas;
		strecpy(ci->client_name, name, lastof(ci->client_name));

		SetWindowDirty(WC_CLIENT_LIST, 0);

		return NETWORK_RECV_STATUS_OKAY;
	}

	/* We don't have this client_id yet, find an empty client_id, and put the data there */
	ci = new NetworkClientInfo(client_id);
	ci->client_playas = playas;
	if (client_id == _network_own_client_id) MY_CLIENT->SetInfo(ci);

	strecpy(ci->client_name, name, lastof(ci->client_name));

	SetWindowDirty(WC_CLIENT_LIST, 0);

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_ERROR)
{
	NetworkErrorCode error = (NetworkErrorCode)p->Recv_uint8();

	switch (error) {
		/* We made an error in the protocol, and our connection is closed.... */
		case NETWORK_ERROR_NOT_AUTHORIZED:
		case NETWORK_ERROR_NOT_EXPECTED:
		case NETWORK_ERROR_COMPANY_MISMATCH:
			_switch_mode_errorstr = STR_NETWORK_ERROR_SERVER_ERROR;
			break;
		case NETWORK_ERROR_FULL:
			_switch_mode_errorstr = STR_NETWORK_ERROR_SERVER_FULL;
			break;
		case NETWORK_ERROR_WRONG_REVISION:
			_switch_mode_errorstr = STR_NETWORK_ERROR_WRONG_REVISION;
			break;
		case NETWORK_ERROR_WRONG_PASSWORD:
			_switch_mode_errorstr = STR_NETWORK_ERROR_WRONG_PASSWORD;
			break;
		case NETWORK_ERROR_KICKED:
			_switch_mode_errorstr = STR_NETWORK_ERROR_KICKED;
			break;
		case NETWORK_ERROR_CHEATER:
			_switch_mode_errorstr = STR_NETWORK_ERROR_CHEATER;
			break;
		default:
			_switch_mode_errorstr = STR_NETWORK_ERROR_LOSTCONNECTION;
	}

	DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);

	return NETWORK_RECV_STATUS_SERVER_ERROR;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_CHECK_NEWGRFS)
{
	uint grf_count = p->Recv_uint8();
	NetworkRecvStatus ret = NETWORK_RECV_STATUS_OKAY;

	/* Check all GRFs */
	for (; grf_count > 0; grf_count--) {
		GRFConfig c;
		MY_CLIENT->Recv_GRFIdentifier(p, &c);

		/* Check whether we know this GRF */
		const GRFConfig *f = FindGRFConfig(c.grfid, c.md5sum);
		if (f == NULL) {
			/* We do not know this GRF, bail out of initialization */
			char buf[sizeof(c.md5sum) * 2 + 1];
			md5sumToString(buf, lastof(buf), c.md5sum);
			DEBUG(grf, 0, "NewGRF %08X not found; checksum %s", BSWAP32(c.grfid), buf);
			ret = NETWORK_RECV_STATUS_NEWGRF_MISMATCH;
		}
	}

	if (ret == NETWORK_RECV_STATUS_OKAY) {
		/* Start receiving the map */
		SEND_COMMAND(PACKET_CLIENT_NEWGRFS_CHECKED)();
	} else {
		/* NewGRF mismatch, bail out */
		_switch_mode_errorstr = STR_NETWORK_ERROR_NEWGRF_MISMATCH;
	}
	return ret;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_NEED_PASSWORD)
{
	NetworkPasswordType type = (NetworkPasswordType)p->Recv_uint8();

	const char *password = _network_join_server_password;

	switch (type) {
		case NETWORK_COMPANY_PASSWORD:
			/* Initialize the password hash salting variables. */
			_password_game_seed = p->Recv_uint32();
			p->Recv_string(_password_server_id, sizeof(_password_server_id));
			if (MY_CLIENT->HasClientQuit()) return NETWORK_RECV_STATUS_MALFORMED_PACKET;
			password = _network_join_company_password;
			/* FALL THROUGH */
		case NETWORK_GAME_PASSWORD:
			if (StrEmpty(password)) {
				ShowNetworkNeedPassword(type);
			} else {
				SEND_COMMAND(PACKET_CLIENT_PASSWORD)(type, password);
			}
			return NETWORK_RECV_STATUS_OKAY;

		default: return NETWORK_RECV_STATUS_MALFORMED_PACKET;
	}
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_WELCOME)
{
	_network_own_client_id = (ClientID)p->Recv_uint32();

	/* Initialize the password hash salting variables, even if they were previously. */
	_password_game_seed = p->Recv_uint32();
	p->Recv_string(_password_server_id, sizeof(_password_server_id));

	/* Start receiving the map */
	SEND_COMMAND(PACKET_CLIENT_GETMAP)();
	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_WAIT)
{
	_network_join_status = NETWORK_JOIN_STATUS_WAITING;
	_network_join_waiting = p->Recv_uint8();
	SetWindowDirty(WC_NETWORK_STATUS_WINDOW, 0);

	/* We are put on hold for receiving the map.. we need GUI for this ;) */
	DEBUG(net, 1, "The server is currently busy sending the map to someone else, please wait..." );
	DEBUG(net, 1, "There are %d clients in front of you", _network_join_waiting);

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_MAP)
{
	static FILE *file_pointer;

	byte maptype;

	maptype = p->Recv_uint8();

	if (MY_CLIENT->HasClientQuit()) return NETWORK_RECV_STATUS_CONN_LOST;

	/* First packet, init some stuff */
	if (maptype == MAP_PACKET_START) {
		file_pointer = FioFOpenFile("network_client.tmp", "wb", AUTOSAVE_DIR);;
		if (file_pointer == NULL) {
			_switch_mode_errorstr = STR_NETWORK_ERROR_SAVEGAMEERROR;
			return NETWORK_RECV_STATUS_SAVEGAME;
		}

		_frame_counter = _frame_counter_server = _frame_counter_max = p->Recv_uint32();

		_network_join_bytes = 0;
		_network_join_bytes_total = p->Recv_uint32();

		/* If the network connection has been closed due to loss of connection
		 * or when _network_join_kbytes_total is 0, the join status window will
		 * do a division by zero. When the connection is lost, we just return
		 * that. If kbytes_total is 0, the packet must be malformed as a
		 * savegame less than 1 kilobyte is practically impossible. */
		if (MY_CLIENT->HasClientQuit()) return NETWORK_RECV_STATUS_CONN_LOST;
		if (_network_join_bytes_total == 0) return NETWORK_RECV_STATUS_MALFORMED_PACKET;

		_network_join_status = NETWORK_JOIN_STATUS_DOWNLOADING;
		SetWindowDirty(WC_NETWORK_STATUS_WINDOW, 0);

		/* The first packet does not contain any more data */
		return NETWORK_RECV_STATUS_OKAY;
	}

	if (maptype == MAP_PACKET_NORMAL) {
		/* We are still receiving data, put it to the file */
		if (fwrite(p->buffer + p->pos, 1, p->size - p->pos, file_pointer) != (size_t)(p->size - p->pos)) {
			_switch_mode_errorstr = STR_NETWORK_ERROR_SAVEGAMEERROR;
			return NETWORK_RECV_STATUS_SAVEGAME;
		}

		_network_join_bytes = ftell(file_pointer);
		SetWindowDirty(WC_NETWORK_STATUS_WINDOW, 0);
	}

	/* Check if this was the last packet */
	if (maptype == MAP_PACKET_END) {
		fclose(file_pointer);

		_network_join_status = NETWORK_JOIN_STATUS_PROCESSING;
		SetWindowDirty(WC_NETWORK_STATUS_WINDOW, 0);

		/* The map is done downloading, load it */
		if (!SafeSaveOrLoad("network_client.tmp", SL_LOAD, GM_NORMAL, AUTOSAVE_DIR)) {
			DeleteWindowById(WC_NETWORK_STATUS_WINDOW, 0);
			_switch_mode_errorstr = STR_NETWORK_ERROR_SAVEGAMEERROR;
			return NETWORK_RECV_STATUS_SAVEGAME;
		}
		/* If the savegame has successfully loaded, ALL windows have been removed,
		 * only toolbar/statusbar and gamefield are visible */

		/* Say we received the map and loaded it correctly! */
		SEND_COMMAND(PACKET_CLIENT_MAP_OK)();

		/* New company/spectator (invalid company) or company we want to join is not active
		 * Switch local company to spectator and await the server's judgement */
		if (_network_join_as == COMPANY_NEW_COMPANY || !Company::IsValidID(_network_join_as)) {
			SetLocalCompany(COMPANY_SPECTATOR);

			if (_network_join_as != COMPANY_SPECTATOR) {
				/* We have arrived and ready to start playing; send a command to make a new company;
				 * the server will give us a client-id and let us in */
				_network_join_status = NETWORK_JOIN_STATUS_REGISTERING;
				ShowJoinStatusWindow();
				NetworkSend_Command(0, 0, 0, CMD_COMPANY_CTRL, NULL, NULL, _local_company);
			}
		} else {
			/* take control over an existing company */
			SetLocalCompany(_network_join_as);
		}
	}

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_FRAME)
{
	_frame_counter_server = p->Recv_uint32();
	_frame_counter_max = p->Recv_uint32();
#ifdef ENABLE_NETWORK_SYNC_EVERY_FRAME
	/* Test if the server supports this option
	 *  and if we are at the frame the server is */
	if (p->pos < p->size) {
		_sync_frame = _frame_counter_server;
		_sync_seed_1 = p->Recv_uint32();
#ifdef NETWORK_SEND_DOUBLE_SEED
		_sync_seed_2 = p->Recv_uint32();
#endif
	}
#endif
	DEBUG(net, 5, "Received FRAME %d", _frame_counter_server);

	/* Let the server know that we received this frame correctly
	 *  We do this only once per day, to save some bandwidth ;) */
	if (!_network_first_time && last_ack_frame < _frame_counter) {
		last_ack_frame = _frame_counter + DAY_TICKS;
		DEBUG(net, 4, "Sent ACK at %d", _frame_counter);
		SEND_COMMAND(PACKET_CLIENT_ACK)();
	}

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_SYNC)
{
	_sync_frame = p->Recv_uint32();
	_sync_seed_1 = p->Recv_uint32();
#ifdef NETWORK_SEND_DOUBLE_SEED
	_sync_seed_2 = p->Recv_uint32();
#endif

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_COMMAND)
{
	CommandPacket cp;
	const char *err = MY_CLIENT->Recv_Command(p, &cp);
	cp.frame    = p->Recv_uint32();
	cp.my_cmd   = p->Recv_bool();
	cp.next     = NULL;

	if (err != NULL) {
		IConsolePrintF(CC_ERROR, "WARNING: %s from server, dropping...", err);
		return NETWORK_RECV_STATUS_MALFORMED_PACKET;
	}

	/* The server did send us this command..
	 *  queue it in our own queue, so we can handle it in the upcoming frame! */
	NetworkAddCommandQueue(cp);

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_CHAT)
{
	char name[NETWORK_NAME_LENGTH], msg[NETWORK_CHAT_LENGTH];
	const NetworkClientInfo *ci = NULL, *ci_to;

	NetworkAction action = (NetworkAction)p->Recv_uint8();
	ClientID client_id = (ClientID)p->Recv_uint32();
	bool self_send = p->Recv_bool();
	p->Recv_string(msg, NETWORK_CHAT_LENGTH);
	int64 data = p->Recv_uint64();

	ci_to = NetworkFindClientInfoFromClientID(client_id);
	if (ci_to == NULL) return NETWORK_RECV_STATUS_OKAY;

	/* Did we initiate the action locally? */
	if (self_send) {
		switch (action) {
			case NETWORK_ACTION_CHAT_CLIENT:
				/* For speaking to client we need the client-name */
				snprintf(name, sizeof(name), "%s", ci_to->client_name);
				ci = NetworkFindClientInfoFromClientID(_network_own_client_id);
				break;

			/* For speaking to company or giving money, we need the company-name */
			case NETWORK_ACTION_GIVE_MONEY:
				if (!Company::IsValidID(ci_to->client_playas)) return NETWORK_RECV_STATUS_OKAY;
				/* fallthrough */
			case NETWORK_ACTION_CHAT_COMPANY: {
				StringID str = Company::IsValidID(ci_to->client_playas) ? STR_COMPANY_NAME : STR_NETWORK_SPECTATORS;
				SetDParam(0, ci_to->client_playas);

				GetString(name, str, lastof(name));
				ci = NetworkFindClientInfoFromClientID(_network_own_client_id);
			} break;

			default: return NETWORK_RECV_STATUS_MALFORMED_PACKET;
		}
	} else {
		/* Display message from somebody else */
		snprintf(name, sizeof(name), "%s", ci_to->client_name);
		ci = ci_to;
	}

	if (ci != NULL)
		NetworkTextMessage(action, (ConsoleColour)GetDrawStringCompanyColour(ci->client_playas), self_send, name, msg, data);
	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_ERROR_QUIT)
{
	ClientID client_id = (ClientID)p->Recv_uint32();

	NetworkClientInfo *ci = NetworkFindClientInfoFromClientID(client_id);
	if (ci != NULL) {
		NetworkTextMessage(NETWORK_ACTION_LEAVE, CC_DEFAULT, false, ci->client_name, NULL, GetNetworkErrorMsg((NetworkErrorCode)p->Recv_uint8()));
		delete ci;
	}

	SetWindowDirty(WC_CLIENT_LIST, 0);

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_QUIT)
{
	NetworkClientInfo *ci;

	ClientID client_id = (ClientID)p->Recv_uint32();

	ci = NetworkFindClientInfoFromClientID(client_id);
	if (ci != NULL) {
		NetworkTextMessage(NETWORK_ACTION_LEAVE, CC_DEFAULT, false, ci->client_name, NULL, STR_NETWORK_MESSAGE_CLIENT_LEAVING);
		delete ci;
	} else {
		DEBUG(net, 0, "Unknown client (%d) is leaving the game", client_id);
	}

	SetWindowDirty(WC_CLIENT_LIST, 0);

	/* If we come here it means we could not locate the client.. strange :s */
	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_JOIN)
{
	ClientID client_id = (ClientID)p->Recv_uint32();

	NetworkClientInfo *ci = NetworkFindClientInfoFromClientID(client_id);
	if (ci != NULL)
		NetworkTextMessage(NETWORK_ACTION_JOIN, CC_DEFAULT, false, ci->client_name);

	SetWindowDirty(WC_CLIENT_LIST, 0);

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_SHUTDOWN)
{
	_switch_mode_errorstr = STR_NETWORK_MESSAGE_SERVER_SHUTDOWN;

	return NETWORK_RECV_STATUS_SERVER_ERROR;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_NEWGAME)
{
	/* To trottle the reconnects a bit, every clients waits
	 *  his _local_company value before reconnecting
	 * COMPANY_SPECTATOR is currently 255, so to avoid long wait periods
	 *  set the max to 10. */
	_network_reconnect = min(_local_company + 1, 10);
	_switch_mode_errorstr = STR_NETWORK_MESSAGE_SERVER_REBOOT;

	return NETWORK_RECV_STATUS_SERVER_ERROR;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_RCON)
{
	char rcon_out[NETWORK_RCONCOMMAND_LENGTH];

	ConsoleColour colour_code = (ConsoleColour)p->Recv_uint16();
	p->Recv_string(rcon_out, sizeof(rcon_out));

	IConsolePrint(colour_code, rcon_out);

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_MOVE)
{
	/* Nothing more in this packet... */
	ClientID client_id   = (ClientID)p->Recv_uint32();
	CompanyID company_id = (CompanyID)p->Recv_uint8();

	if (client_id == 0) {
		/* definitely an invalid client id, debug message and do nothing. */
		DEBUG(net, 0, "[move] received invalid client index = 0");
		return NETWORK_RECV_STATUS_MALFORMED_PACKET;
	}

	const NetworkClientInfo *ci = NetworkFindClientInfoFromClientID(client_id);
	/* Just make sure we do not try to use a client_index that does not exist */
	if (ci == NULL) return NETWORK_RECV_STATUS_OKAY;

	/* if not valid player, force spectator, else check player exists */
	if (!Company::IsValidID(company_id)) company_id = COMPANY_SPECTATOR;

	if (client_id == _network_own_client_id) {
		SetLocalCompany(company_id);
	}

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_CONFIG_UPDATE)
{
	_network_server_max_companies = p->Recv_uint8();
	_network_server_max_spectators = p->Recv_uint8();

	return NETWORK_RECV_STATUS_OKAY;
}

DEF_CLIENT_RECEIVE_COMMAND(PACKET_SERVER_COMPANY_UPDATE)
{
	_network_company_passworded = p->Recv_uint16();
	SetWindowClassesDirty(WC_COMPANY);

	return NETWORK_RECV_STATUS_OKAY;
}


/* The layout for the receive-functions by the client */
typedef NetworkRecvStatus NetworkClientPacket(Packet *p);

/* This array matches PacketType. At an incoming
 *  packet it is matches against this array
 *  and that way the right function to handle that
 *  packet is found. */
static NetworkClientPacket * const _network_client_packet[] = {
	RECEIVE_COMMAND(PACKET_SERVER_FULL),
	RECEIVE_COMMAND(PACKET_SERVER_BANNED),
	NULL, // PACKET_CLIENT_JOIN,
	RECEIVE_COMMAND(PACKET_SERVER_ERROR),
	NULL, // PACKET_CLIENT_COMPANY_INFO,
	RECEIVE_COMMAND(PACKET_SERVER_COMPANY_INFO),
	RECEIVE_COMMAND(PACKET_SERVER_CLIENT_INFO),
	RECEIVE_COMMAND(PACKET_SERVER_NEED_PASSWORD),
	NULL, // PACKET_CLIENT_PASSWORD,
	RECEIVE_COMMAND(PACKET_SERVER_WELCOME),
	NULL, // PACKET_CLIENT_GETMAP,
	RECEIVE_COMMAND(PACKET_SERVER_WAIT),
	RECEIVE_COMMAND(PACKET_SERVER_MAP),
	NULL, // PACKET_CLIENT_MAP_OK,
	RECEIVE_COMMAND(PACKET_SERVER_JOIN),
	RECEIVE_COMMAND(PACKET_SERVER_FRAME),
	RECEIVE_COMMAND(PACKET_SERVER_SYNC),
	NULL, // PACKET_CLIENT_ACK,
	NULL, // PACKET_CLIENT_COMMAND,
	RECEIVE_COMMAND(PACKET_SERVER_COMMAND),
	NULL, // PACKET_CLIENT_CHAT,
	RECEIVE_COMMAND(PACKET_SERVER_CHAT),
	NULL, // PACKET_CLIENT_SET_PASSWORD,
	NULL, // PACKET_CLIENT_SET_NAME,
	NULL, // PACKET_CLIENT_QUIT,
	NULL, // PACKET_CLIENT_ERROR,
	RECEIVE_COMMAND(PACKET_SERVER_QUIT),
	RECEIVE_COMMAND(PACKET_SERVER_ERROR_QUIT),
	RECEIVE_COMMAND(PACKET_SERVER_SHUTDOWN),
	RECEIVE_COMMAND(PACKET_SERVER_NEWGAME),
	RECEIVE_COMMAND(PACKET_SERVER_RCON),
	NULL, // PACKET_CLIENT_RCON,
	RECEIVE_COMMAND(PACKET_SERVER_CHECK_NEWGRFS),
	NULL, // PACKET_CLIENT_NEWGRFS_CHECKED,
	RECEIVE_COMMAND(PACKET_SERVER_MOVE),
	NULL, // PACKET_CLIENT_MOVE
	RECEIVE_COMMAND(PACKET_SERVER_COMPANY_UPDATE),
	RECEIVE_COMMAND(PACKET_SERVER_CONFIG_UPDATE),
};

/* If this fails, check the array above with network_data.h */
assert_compile(lengthof(_network_client_packet) == PACKET_END);

/* Is called after a client is connected to the server */
void NetworkClient_Connected()
{
	/* Set the frame-counter to 0 so nothing happens till we are ready */
	_frame_counter = 0;
	_frame_counter_server = 0;
	last_ack_frame = 0;
	/* Request the game-info */
	SEND_COMMAND(PACKET_CLIENT_JOIN)();
}

/* Reads the packets from the socket-stream, if available */
NetworkRecvStatus NetworkClient_ReadPackets(NetworkClientSocket *cs)
{
	Packet *p;
	NetworkRecvStatus res = NETWORK_RECV_STATUS_OKAY;

	while (res == NETWORK_RECV_STATUS_OKAY && (p = cs->Recv_Packet()) != NULL) {
		byte type = p->Recv_uint8();
		if (type < PACKET_END && _network_client_packet[type] != NULL && !MY_CLIENT->HasClientQuit()) {
			res = _network_client_packet[type](p);
		} else {
			res = NETWORK_RECV_STATUS_MALFORMED_PACKET;
			DEBUG(net, 0, "[client] received invalid packet type %d", type);
		}

		delete p;
	}

	return res;
}

void NetworkClientSendRcon(const char *password, const char *command)
{
	SEND_COMMAND(PACKET_CLIENT_RCON)(password, command);
}

/**
 * Notify the server of this client wanting to be moved to another company.
 * @param company_id id of the company the client wishes to be moved to.
 * @param pass the password, is only checked on the server end if a password is needed.
 * @return void
 */
void NetworkClientRequestMove(CompanyID company_id, const char *pass)
{
	SEND_COMMAND(PACKET_CLIENT_MOVE)(company_id, pass);
}

void NetworkUpdateClientName()
{
	NetworkClientInfo *ci = NetworkFindClientInfoFromClientID(_network_own_client_id);

	if (ci == NULL) return;

	/* Don't change the name if it is the same as the old name */
	if (strcmp(ci->client_name, _settings_client.network.client_name) != 0) {
		if (!_network_server) {
			SEND_COMMAND(PACKET_CLIENT_SET_NAME)(_settings_client.network.client_name);
		} else {
			if (NetworkFindName(_settings_client.network.client_name)) {
				NetworkTextMessage(NETWORK_ACTION_NAME_CHANGE, CC_DEFAULT, false, ci->client_name, _settings_client.network.client_name);
				strecpy(ci->client_name, _settings_client.network.client_name, lastof(ci->client_name));
				NetworkUpdateClientInfo(CLIENT_ID_SERVER);
			}
		}
	}
}

void NetworkClientSendChat(NetworkAction action, DestType type, int dest, const char *msg, int64 data)
{
	SEND_COMMAND(PACKET_CLIENT_CHAT)(action, type, dest, msg, data);
}

void NetworkClientSetPassword(const char *password)
{
	SEND_COMMAND(PACKET_CLIENT_SET_PASSWORD)(password);
}

/**
 * Tell whether the client has team members where he/she can chat to.
 * @param cio client to check members of.
 * @return true if there is at least one team member.
 */
bool NetworkClientPreferTeamChat(const NetworkClientInfo *cio)
{
	/* Only companies actually playing can speak to team. Eg spectators cannot */
	if (!_settings_client.gui.prefer_teamchat || !Company::IsValidID(cio->client_playas)) return false;

	const NetworkClientInfo *ci;
	FOR_ALL_CLIENT_INFOS(ci) {
		if (ci->client_playas == cio->client_playas && ci != cio) return true;
	}

	return false;
}

/**
 * Check if max_companies has been reached on the server (local check only).
 * @return true if the max value has been reached or exceeded, false otherwise.
 */
bool NetworkMaxCompaniesReached()
{
	return Company::GetNumItems() >= (_network_server ? _settings_client.network.max_companies : _network_server_max_companies);
}

/**
 * Check if max_spectatos has been reached on the server (local check only).
 * @return true if the max value has been reached or exceeded, false otherwise.
 */
bool NetworkMaxSpectatorsReached()
{
	return NetworkSpectatorCount() >= (_network_server ? _settings_client.network.max_spectators : _network_server_max_spectators);
}

/**
 * Print all the clients to the console
 */
void NetworkPrintClients()
{
	NetworkClientInfo *ci;
	FOR_ALL_CLIENT_INFOS(ci) {
		IConsolePrintF(CC_INFO, "Client #%1d  name: '%s'  company: %1d  IP: %s",
				ci->client_id,
				ci->client_name,
				ci->client_playas + (Company::IsValidID(ci->client_playas) ? 1 : 0),
				GetClientIP(ci));
	}
}

#endif /* ENABLE_NETWORK */