summaryrefslogtreecommitdiff
path: root/src/modules/m_spanningtree/treesocket1.cpp
blob: b55873291f173b26ce0aa09cb800d41f052f3957 (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
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "configreader.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include "commands/cmd_whois.h"
#include "commands/cmd_stats.h"
#include "socket.h"
#include "inspircd.h"
#include "wildcard.h"
#include "xline.h"
#include "transport.h"
#include "m_hash.h"
#include "socketengine.h"

#include "m_spanningtree/main.h"
#include "m_spanningtree/utils.h"
#include "m_spanningtree/treeserver.h"
#include "m_spanningtree/link.h"
#include "m_spanningtree/treesocket.h"
#include "m_spanningtree/resolvers.h"
#include "m_spanningtree/handshaketimer.h"

/* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h */


/** Because most of the I/O gubbins are encapsulated within
 * InspSocket, we just call the superclass constructor for
 * most of the action, and append a few of our own values
 * to it.
 */
TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, Module* HookMod)
	: InspSocket(SI, host, port, listening, maxtime), Utils(Util), Hook(HookMod)
{
	myhost = host;
	this->LinkState = LISTENER;
	theirchallenge = ourchallenge = "";
	if (listening && Hook)
		InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
}

TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod)
	: InspSocket(SI, host, port, listening, maxtime, bindto), Utils(Util), Hook(HookMod)
{
	myhost = ServerName;
	theirchallenge = ourchallenge = "";
	this->LinkState = CONNECTING;
	if (Hook)
		InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
}

/** When a listening socket gives us a new file descriptor,
 * we must associate it with a socket without creating a new
 * connection. This constructor is used for this purpose.
 */
TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod)
	: InspSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
{
	this->LinkState = WAIT_AUTH_1;
	theirchallenge = ourchallenge = "";
	/* If we have a transport module hooked to the parent, hook the same module to this
	 * socket, and set a timer waiting for handshake before we send CAPAB etc.
	 */
	if (Hook)
		InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();

	Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(Utils->LinkBlocks[0]), this->Utils, 1));
}

ServerState TreeSocket::GetLinkState()
{
	return this->LinkState;
}

Module* TreeSocket::GetHook()
{
	return this->Hook;
}

TreeSocket::~TreeSocket()
{
	if (Hook)
		InspSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();

	Utils->DelBurstingServer(this);
}

const std::string& TreeSocket::GetOurChallenge()
{
	return this->ourchallenge;
}

void TreeSocket::SetOurChallenge(const std::string &c)
{
	this->ourchallenge = c;
}

const std::string& TreeSocket::GetTheirChallenge()
{
	return this->theirchallenge;
}

void TreeSocket::SetTheirChallenge(const std::string &c)
{
	this->theirchallenge = c;
}

std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
{
	/* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
	 * suggesting the use of HMAC to secure the password against various attacks.
	 *
	 * Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no
	 *       HMAC challenge/response.
	 */
	Module* sha256 = Instance->FindModule("m_sha256.so");
	if (Utils->ChallengeResponse && sha256 && !challenge.empty())
	{
		/* XXX: This is how HMAC is supposed to be done:
		 *
		 * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
		 *
		 * Note that we are encoding the hex hash, not the binary
		 * output of the hash which is slightly different to standard.
		 *
		 * Don't ask me why its always 0x5c and 0x36... it just is.
		 */
		std::string hmac1, hmac2;

		for (size_t n = 0; n < password.length(); n++)
		{
			hmac1 += static_cast<char>(password[n] ^ 0x5C);
			hmac2 += static_cast<char>(password[n] ^ 0x36);
		}

		hmac2 += challenge;
		HashResetRequest(Utils->Creator, sha256).Send();
		hmac2 = HashSumRequest(Utils->Creator, sha256, hmac2).Send();

		HashResetRequest(Utils->Creator, sha256).Send();
		std::string hmac = hmac1 + hmac2;
		hmac = HashSumRequest(Utils->Creator, sha256, hmac).Send();

		return "HMAC-SHA256:"+ hmac;
	}
	else if (!challenge.empty() && !sha256)
		Instance->Log(DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");

	return password;
}

/** When an outbound connection finishes connecting, we receive
 * this event, and must send our SERVER string to the other
 * side. If the other side is happy, as outlined in the server
 * to server docs on the inspircd.org site, the other side
 * will then send back its own server string.
 */
bool TreeSocket::OnConnected()
{
	if (this->LinkState == CONNECTING)
	{
		/* we do not need to change state here. */
		for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
		{
			if (x->Name == this->myhost)
			{
				this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] started.");
				if (Hook)
				{
					InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
					this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+x->Hook+"\2");
				}
				this->OutboundPass = x->SendPass;

				/* found who we're supposed to be connecting to, send the neccessary gubbins. */
				if (this->GetHook())
					Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(*x), this->Utils, 1));
				else
					this->SendCapabilities();

				return true;
			}
		}
	}
	/* There is a (remote) chance that between the /CONNECT and the connection
	 * being accepted, some muppet has removed the <link> block and rehashed.
	 * If that happens the connection hangs here until it's closed. Unlikely
	 * and rather harmless.
	 */
	this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2 lost link tag(!)");
	return true;
}

void TreeSocket::OnError(InspSocketError e)
{
	Link* MyLink;

	switch (e)
	{
		case I_ERR_CONNECT:
			this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Connection to \002"+myhost+"\002 refused");
			MyLink = Utils->FindLink(myhost);
			if (MyLink)
				Utils->DoFailOver(MyLink);
		break;
		case I_ERR_SOCKET:
			this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Could not create socket");
		break;
		case I_ERR_BIND:
			this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Error binding socket to address or port");
		break;
		case I_ERR_WRITE:
			this->Instance->SNO->WriteToSnoMask('l',"Connection failed: I/O error on connection");
		break;
		case I_ERR_NOMOREFDS:
			this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Operating system is out of file descriptors!");
		break;
		default:
			if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
			{
				std::string errstr = strerror(errno);
				this->Instance->SNO->WriteToSnoMask('l',"Connection to \002"+myhost+"\002 failed with OS error: " + errstr);
			}
		break;
	}
}

int TreeSocket::OnDisconnect()
{
	/* For the same reason as above, we don't
	 * handle OnDisconnect()
	 */
	return true;
}

/** Recursively send the server tree with distances as hops.
 * This is used during network burst to inform the other server
 * (and any of ITS servers too) of what servers we know about.
 * If at any point any of these servers already exist on the other
 * end, our connection may be terminated. The hopcounts given
 * by this function are relative, this doesn't matter so long as
 * they are all >1, as all the remote servers re-calculate them
 * to be relative too, with themselves as hop 0.
 */
void TreeSocket::SendServers(TreeServer* Current, TreeServer* s, int hops)
{
	char command[1024];
	for (unsigned int q = 0; q < Current->ChildCount(); q++)
	{
		TreeServer* recursive_server = Current->GetChild(q);
		if (recursive_server != s)
		{
			snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str());
			this->WriteLine(command);
			this->WriteLine(":"+recursive_server->GetName()+" VERSION :"+recursive_server->GetVersion());
			/* down to next level */
			this->SendServers(recursive_server, s, hops+1);
		}
	}
}

std::string TreeSocket::MyCapabilities()
{
	std::vector<std::string> modlist;
	std::string capabilities = "";
	for (int i = 0; i <= this->Instance->GetModuleCount(); i++)
	{
		if (this->Instance->modules[i]->GetVersion().Flags & VF_COMMON)
			modlist.push_back(this->Instance->Config->module_names[i]);
	}
	sort(modlist.begin(),modlist.end());
	for (unsigned int i = 0; i < modlist.size(); i++)
	{
		if (i)
			capabilities = capabilities + ",";
		capabilities = capabilities + modlist[i];
	}
	return capabilities;
}

std::string TreeSocket::RandString(unsigned int length)
{
	char* randombuf = new char[length+1];
	std::string out;
	int fd = open("/dev/urandom", O_RDONLY, 0);

	if (fd >= 0)
	{
		read(fd, randombuf, length);
		close(fd);
	}
	else
	{
		for (unsigned int i = 0; i < length; i++)
			randombuf[i] = rand();
	}

	for (unsigned int i = 0; i < length; i++)
	{
		char randchar = static_cast<char>((randombuf[i] & 0x7F) | 0x21);
		out += (randchar == '=' ? '_' : randchar);
	}

	delete[] randombuf;
	return out;
}

void TreeSocket::SendCapabilities()
{
	irc::commasepstream modulelist(MyCapabilities());
	this->WriteLine("CAPAB START");

	/* Send module names, split at 509 length */
	std::string item = "*";
	std::string line = "CAPAB MODULES ";
	while ((item = modulelist.GetToken()) != "")
	{
		if (line.length() + item.length() + 1 > 509)
		{
			this->WriteLine(line);
			line = "CAPAB MODULES ";
		}

		if (line != "CAPAB MODULES ")
			line.append(",");

		line.append(item);
	}
	if (line != "CAPAB MODULES ")
		this->WriteLine(line);

	int ip6 = 0;
	int ip6support = 0;
#ifdef IPV6
	ip6 = 1;
#endif
#ifdef SUPPORT_IP6LINKS
	ip6support = 1;
#endif
	std::string extra;
	/* Do we have sha256 available? If so, we send a challenge */
	if (Utils->ChallengeResponse && (Instance->FindModule("m_sha256.so")))
	{
		this->SetOurChallenge(RandString(20));
		extra = " CHALLENGE=" + this->GetOurChallenge();
	}

	this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion)+extra);

	this->WriteLine("CAPAB END");
}

/* Check a comma seperated list for an item */
bool TreeSocket::HasItem(const std::string &list, const std::string &item)
{
	irc::commasepstream seplist(list);
	std::string item2 = "*";
	while ((item2 = seplist.GetToken()) != "")
	{
		if (item2 == item)
			return true;
	}
	return false;
}

/* Isolate and return the elements that are different between two comma seperated lists */
std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
{
	irc::commasepstream list_one(one);
	std::string item = "*";
	std::string result = "";
	while ((item = list_one.GetToken()) != "")
	{
		if (!HasItem(two, item))
		{
			result.append(" ");
			result.append(item);
		}
	}
	return result;
}

void TreeSocket::SendError(const std::string &errormessage)
{
	/* Display the error locally as well as sending it remotely */
	this->WriteLine("ERROR :"+errormessage);
	this->Instance->SNO->WriteToSnoMask('l',"Sent \2ERROR\2 to "+this->InboundServerName+": "+errormessage);
	/* One last attempt to make sure the error reaches its target */
	this->FlushWriteBuffer();
}

bool TreeSocket::Capab(const std::deque<std::string> &params)
{
	if (params.size() < 1)
	{
		this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
		return false;
	}
	if (params[0] == "START")
	{
		this->ModuleList = "";
		this->CapKeys.clear();
	}
	else if (params[0] == "END")
	{
		std::string reason = "";
		int ip6support = 0;
#ifdef SUPPORT_IP6LINKS
		ip6support = 1;
#endif
		/* Compare ModuleList and check CapKeys...
		 * Maybe this could be tidier? -- Brain
		 */
		if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
		{
			std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
			if (!diff.length())
			{
				diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
			}
			else
			{
				diff = "this server:" + diff;
			}
			if (diff.length() == 12)
				reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
			else
				reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
		}

		cap_validation valid_capab[] = { 
			{"Maximum nickname lengths differ or remote nickname length not specified", "NICKMAX", NICKMAX},
			{"Maximum ident lengths differ or remote ident length not specified", "IDENTMAX", IDENTMAX},
			{"Maximum channel lengths differ or remote channel length not specified", "CHANMAX", CHANMAX},
			{"Maximum modes per line differ or remote modes per line not specified", "MAXMODES", MAXMODES},
			{"Maximum quit lengths differ or remote quit length not specified", "MAXQUIT", MAXQUIT},
			{"Maximum topic lengths differ or remote topic length not specified", "MAXTOPIC", MAXTOPIC},
			{"Maximum kick lengths differ or remote kick length not specified", "MAXKICK", MAXKICK},
			{"Maximum GECOS (fullname) lengths differ or remote GECOS length not specified", "MAXGECOS", MAXGECOS},
			{"Maximum awaymessage lengths differ or remote awaymessage length not specified", "MAXAWAY", MAXAWAY},
			{"", "", 0}
		};

		if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
			reason = "We don't both support linking to IPV6 servers";
		if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
			reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
		if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
		{
			if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
				reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
			else
				reason = "Protocol version not specified";
		}

		if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop))))
			reason = "We don't both have halfop support enabled/disabled identically";

		for (int x = 0; valid_capab[x].size; ++x)
		{
			if (((this->CapKeys.find(valid_capab[x].key) == this->CapKeys.end()) ||	((this->CapKeys.find(valid_capab[x].key) != this->CapKeys.end()) &&
						 (this->CapKeys.find(valid_capab[x].key)->second != ConvToStr(valid_capab[x].size)))))
				reason = valid_capab[x].reason;
		}
	
		/* Challenge response, store their challenge for our password */
		std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
		if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (Instance->FindModule("m_sha256.so")))
		{
			/* Challenge-response is on now */
			this->SetTheirChallenge(n->second);
			if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
			{
				this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 :"+this->Instance->Config->ServerDesc);
			}
		}
		else
		{
			/* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
			if (this->LinkState == CONNECTING)
				this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+OutboundPass+" 0 :"+this->Instance->Config->ServerDesc);
		}

		if (reason.length())
		{
			this->SendError("CAPAB negotiation failed: "+reason);
			return false;
		}
	}
	else if ((params[0] == "MODULES") && (params.size() == 2))
	{
		if (!this->ModuleList.length())
		{
			this->ModuleList.append(params[1]);
		}
		else
		{
			this->ModuleList.append(",");
			this->ModuleList.append(params[1]);
		}
	}

	else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
	{
		irc::tokenstream capabs(params[1]);
		std::string item;
		bool more = true;
		while ((more = capabs.GetToken(item)))
		{
			/* Process each key/value pair */
			std::string::size_type equals = item.rfind('=');
			if (equals != std::string::npos)
			{
				std::string var = item.substr(0, equals);
				std::string value = item.substr(equals+1, item.length());
				CapKeys[var] = value;
			}
		}
	}
	return true;
}

/** This function forces this server to quit, removing this server
 * and any users on it (and servers and users below that, etc etc).
 * It's very slow and pretty clunky, but luckily unless your network
 * is having a REAL bad hair day, this function shouldnt be called
 * too many times a month ;-)
 */
void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
{
	/* recursively squit the servers attached to 'Current'.
	 * We're going backwards so we don't remove users
	 * while we still need them ;)
	 */
	for (unsigned int q = 0; q < Current->ChildCount(); q++)
	{
		TreeServer* recursive_server = Current->GetChild(q);
		this->SquitServer(from,recursive_server);
	}
	/* Now we've whacked the kids, whack self */
	num_lost_servers++;
	num_lost_users += Current->QuitUsers(from);
}

/** This is a wrapper function for SquitServer above, which
 * does some validation first and passes on the SQUIT to all
 * other remaining servers.
 */
void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
{
	if ((Current) && (Current != Utils->TreeRoot))
	{
		Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
		rmode.Send(Instance);

		std::deque<std::string> params;
		params.push_back(Current->GetName());
		params.push_back(":"+reason);
		Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
		if (Current->GetParent() == Utils->TreeRoot)
		{
			this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split: "+reason);
		}
		else
		{
			this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
		}
		num_lost_servers = 0;
		num_lost_users = 0;
		std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
		SquitServer(from, Current);
		Current->Tidy();
		Current->GetParent()->DelChild(Current);
		DELETE(Current);
		this->Instance->SNO->WriteToSnoMask('l',"Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
	}
	else
		Instance->Log(DEFAULT,"Squit from unknown server");
}

/** FMODE command - server mode with timestamp checks */
bool TreeSocket::ForceMode(const std::string &source, std::deque<std::string> &params)
{
	/* Chances are this is a 1.0 FMODE without TS */
	if (params.size() < 3)
	{
		/* No modes were in the command, probably a channel with no modes set on it */
		return true;
	}

	bool smode = false;
	std::string sourceserv;
	/* Are we dealing with an FMODE from a user, or from a server? */
	userrec* who = this->Instance->FindNick(source);
	if (who)
	{
		/* FMODE from a user, set sourceserv to the users server name */
		sourceserv = who->server;
	}
	else
	{
		/* FMODE from a server, create a fake user to receive mode feedback */
		who = new userrec(this->Instance);
		who->SetFd(FD_MAGIC_NUMBER);
		smode = true;	   /* Setting this flag tells us we should free the userrec later */
		sourceserv = source;    /* Set sourceserv to the actual source string */
	}
	const char* modelist[64];
	time_t TS = 0;
	int n = 0;
	memset(&modelist,0,sizeof(modelist));
	for (unsigned int q = 0; (q < params.size()) && (q < 64); q++)
	{
		if (q == 1)
		{
			/* The timestamp is in this position.
			 * We don't want to pass that up to the
			 * server->client protocol!
			 */
			TS = atoi(params[q].c_str());
		}
		else
		{
			/* Everything else is fine to append to the modelist */
			modelist[n++] = params[q].c_str();
		}

	}
	/* Extract the TS value of the object, either userrec or chanrec */
	userrec* dst = this->Instance->FindNick(params[0]);
	chanrec* chan = NULL;
	time_t ourTS = 0;
	if (dst)
	{
		ourTS = dst->age;
	}
	else
	{
		chan = this->Instance->FindChan(params[0]);
		if (chan)
		{
			ourTS = chan->age;
		}
		else
			/* Oops, channel doesnt exist! */
			return true;
	}

	/* TS is equal or less: Merge the mode changes into ours and pass on.
	 */
	if (TS <= ourTS)
	{
		if (TS < ourTS)
			Instance->Log(DEFAULT,"*** BUG *** Channel TS sent in FMODE to %s is %lu which is not equal to %lu!", params[0].c_str(), TS, ourTS);

		if (smode)
		{
			this->Instance->SendMode(modelist, n, who);
		}
		else
		{
			this->Instance->CallCommandHandler("MODE", modelist, n, who);
		}
		/* HOT POTATO! PASS IT ON! */
		Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
	}
	/* If the TS is greater than ours, we drop the mode and dont pass it anywhere.
	 */

	if (smode)
		DELETE(who);

	return true;
}

/** FTOPIC command */
bool TreeSocket::ForceTopic(const std::string &source, std::deque<std::string> &params)
{
	if (params.size() != 4)
		return true;
	time_t ts = atoi(params[1].c_str());
	std::string nsource = source;
	chanrec* c = this->Instance->FindChan(params[0]);
	if (c)
	{
		if ((ts >= c->topicset) || (!*c->topic))
		{
			std::string oldtopic = c->topic;
			strlcpy(c->topic,params[3].c_str(),MAXTOPIC);
			strlcpy(c->setby,params[2].c_str(),127);
			c->topicset = ts;
			/* if the topic text is the same as the current topic,
			 * dont bother to send the TOPIC command out, just silently
			 * update the set time and set nick.
			 */
			if (oldtopic != params[3])
			{
				userrec* user = this->Instance->FindNick(source);
				if (!user)
				{
					c->WriteChannelWithServ(Instance->Config->ServerName, "TOPIC %s :%s", c->name, c->topic);
				}
				else
				{
					c->WriteChannel(user, "TOPIC %s :%s", c->name, c->topic);
					nsource = user->server;
				}
				/* all done, send it on its way */
				params[3] = ":" + params[3];
				Utils->DoOneToAllButSender(source,"FTOPIC",params,nsource);
			}
		}

	}
	return true;
}

/** FJOIN, similar to TS6 SJOIN, but not quite. */
bool TreeSocket::ForceJoin(const std::string &source, std::deque<std::string> &params)
{
	/* 1.1 FJOIN works as follows:
	 *
	 * Each FJOIN is sent along with a timestamp, and the side with the lowest
	 * timestamp 'wins'. From this point on we will refer to this side as the
	 * winner. The side with the higher timestamp loses, from this point on we
	 * will call this side the loser or losing side. This should be familiar to
	 * anyone who's dealt with dreamforge or TS6 before.
	 *
	 * When two sides of a split heal and this occurs, the following things
	 * will happen:
	 *
	 * If the timestamps are exactly equal, both sides merge their privilages
	 * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
	 * re-created during a split, this is safe to do.
	 *
	 * If the timestamps are NOT equal, the losing side removes all of its
	 * modes from the channel, before introducing new users into the channel
	 * which are listed in the FJOIN command's parameters. The losing side then
	 * LOWERS its timestamp value of the channel to match that of the winning
	 * side, and the modes of the users of the winning side are merged in with
	 * the losing side.
	 *
	 * The winning side on the other hand will ignore all user modes from the
	 * losing side, so only its own modes get applied. Life is simple for those
	 * who succeed at internets. :-)
	 *
	 * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN,
	 * FJOIN does not contain the simple-modes such as +iklmnsp. Why not,
	 * you ask? Well, quite simply because we don't need to. They'll be sent
	 * after the FJOIN by FMODE, and FMODE is timestamped, so in the event
	 * the losing side sends any modes for the channel which shouldnt win,
	 * they wont as their timestamp will be too high :-)
	 */

	if (params.size() < 3)
		return true;

	irc::modestacker modestack(true);				/* Modes to apply from the users in the user list */
	userrec* who = NULL;		   				/* User we are currently checking */
	std::string channel = params[0];				/* Channel name, as a string */
	time_t TS = atoi(params[1].c_str());    			/* Timestamp given to us for remote side */
	irc::tokenstream users(params[2]);				/* Users from the user list */
	bool apply_other_sides_modes = true;				/* True if we are accepting the other side's modes */
	chanrec* chan = this->Instance->FindChan(channel);		/* The channel we're sending joins to */
	time_t ourTS = chan ? chan->age : Instance->Time(true)+600;	/* The TS of our side of the link */
	bool created = !chan;						/* True if the channel doesnt exist here yet */
	std::string item;						/* One item in the list of nicks */

	params[2] = ":" + params[2];
	Utils->DoOneToAllButSender(source,"FJOIN",params,source);

	/* If our TS is less than theirs, we dont accept their modes */
	if (ourTS < TS)
		apply_other_sides_modes = false;

	/* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
	if (ourTS > TS)
	{
		std::deque<std::string> param_list;
		if (Utils->AnnounceTSChange && chan)
			chan->WriteChannelWithServ(Instance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name, chan->name, ourTS, TS);
		ourTS = TS;
		if (!created)
		{
			chan->age = TS;
			param_list.push_back(channel);
			this->RemoveStatus(Instance->Config->ServerName, param_list);
		}
	}

	/* Now, process every 'prefixes,nick' pair */
	while (users.GetToken(item))
	{
		const char* usr = item.c_str();
		if (usr && *usr)
		{
			const char* permissions = usr;
			/* Iterate through all the prefix values, convert them from prefixes to mode letters */
			std::string modes;
			while ((*permissions) && (*permissions != ','))
			{
				ModeHandler* mh = Instance->Modes->FindPrefix(*permissions);
				if (mh)
					modes = modes + mh->GetModeChar();
				else
				{
					this->SendError(std::string("Invalid prefix '")+(*permissions)+"' in FJOIN");
					return false;
				}
				usr++;
				permissions++;
			}
			/* Advance past the comma, to the nick */
			usr++;
			
			/* Check the user actually exists */
			who = this->Instance->FindNick(usr);
			if (who)
			{
				/* Check that the user's 'direction' is correct */
				TreeServer* route_back_again = Utils->BestRouteTo(who->server);
				if ((!route_back_again) || (route_back_again->GetSocket() != this))
					continue;

				/* Add any permissions this user had to the mode stack */
				for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
					modestack.Push(*x, who->nick);

				chanrec::JoinUser(this->Instance, who, channel.c_str(), true, "", TS);
			}
			else
			{
				Instance->Log(SPARSE,"Warning! Invalid user %s in FJOIN to channel %s IGNORED", usr, channel.c_str());
				continue;
			}
		}
	}

	/* Flush mode stacker if we lost the FJOIN or had equal TS */
	if (apply_other_sides_modes)
	{
		std::deque<std::string> stackresult;
		const char* mode_junk[MAXMODES+1];
		userrec* n = new userrec(Instance);
		n->SetFd(FD_MAGIC_NUMBER);
		mode_junk[0] = channel.c_str();

		while (modestack.GetStackedLine(stackresult))
		{
			for (size_t j = 0; j < stackresult.size(); j++)
			{
				mode_junk[j+1] = stackresult[j].c_str();
			}
			Instance->SendMode(mode_junk, stackresult.size() + 1, n);
		}

		delete n;
	}

	return true;
}

/** NICK command */
bool TreeSocket::IntroduceClient(const std::string &source, std::deque<std::string> &params)
{
	/** Do we have enough parameters:
	 * NICK age nick host dhost ident +modes ip :gecos
	 */
	if (params.size() != 8)
	{
		this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction ("+params[1]+"?)");
		return true;
	}

	time_t age = ConvToInt(params[0]);
	const char* tempnick = params[1].c_str();

	cmd_validation valid[] = { {"Nickname", 1, NICKMAX}, {"Hostname", 2, 64}, {"Displayed hostname", 3, 64}, {"Ident", 4, IDENTMAX}, {"GECOS", 7, MAXGECOS}, {"", 0, 0} };

	TreeServer* remoteserver = Utils->FindServer(source);
	if (!remoteserver)
	{
		this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Unknown server "+source+")");
		return true;
	}

	/* Check parameters for validity before introducing the client, discovered by dmb */
	if (!age)
	{
		this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Invalid TS?)");
		return true;
	}
	for (size_t x = 0; valid[x].length; ++x)
	{
		if (params[valid[x].param].length() > valid[x].length)
		{
			this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (" + valid[x].item + " > " + ConvToStr(valid[x].length) + ")");
			return true;
		}
	}

	/** Our client looks ok, lets introduce it now
	 */
	Instance->Log(DEBUG,"New remote client %s",tempnick);
	user_hash::iterator iter = this->Instance->clientlist->find(tempnick);

	if (iter != this->Instance->clientlist->end())
	{
		/* nick collision */
		this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+tempnick+" :Nickname collision");
		userrec::QuitUser(this->Instance, iter->second, "Nickname collision");
		return true;
	}

	userrec* _new = new userrec(this->Instance);
	(*(this->Instance->clientlist))[tempnick] = _new;
	_new->SetFd(FD_MAGIC_NUMBER);
	strlcpy(_new->nick, tempnick,NICKMAX-1);
	strlcpy(_new->host, params[2].c_str(),64);
	strlcpy(_new->dhost, params[3].c_str(),64);
	_new->server = this->Instance->FindServerNamePtr(source.c_str());
	strlcpy(_new->ident, params[4].c_str(),IDENTMAX);
	strlcpy(_new->fullname, params[7].c_str(),MAXGECOS);
	_new->registered = REG_ALL;
	_new->signon = age;

	/* we need to remove the + from the modestring, so we can do our stuff */
	std::string::size_type pos_after_plus = params[5].find_first_not_of('+');
	if (pos_after_plus != std::string::npos)
	params[5] = params[5].substr(pos_after_plus);

	for (std::string::iterator v = params[5].begin(); v != params[5].end(); v++)
	{
		_new->modes[(*v)-65] = 1;
		/* For each mode thats set, increase counter */
		ModeHandler* mh = Instance->Modes->FindMode(*v, MODETYPE_USER);
		if (mh)
			mh->ChangeCount(1);
	}

	/* now we've done with modes processing, put the + back for remote servers */
	params[5] = "+" + params[5];

#ifdef SUPPORT_IP6LINKS
	if (params[6].find_first_of(":") != std::string::npos)
		_new->SetSockAddr(AF_INET6, params[6].c_str(), 0);
	else
#endif
		_new->SetSockAddr(AF_INET, params[6].c_str(), 0);

	Instance->AddGlobalClone(_new);

	bool send = !(((this->Utils->quiet_bursts) && (this->bursting || Utils->FindRemoteBurstServer(remoteserver))) || (this->Instance->SilentULine(_new->server)));
	
	if (send)
		this->Instance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s!%s@%s [%s] [%s]",_new->server,_new->nick,_new->ident,_new->host, _new->GetIPString(), _new->fullname);

	params[7] = ":" + params[7];
	Utils->DoOneToAllButSender(source,"NICK", params, source);

	// Increment the Source Servers User Count..
	TreeServer* SourceServer = Utils->FindServer(source);
	if (SourceServer)
	{
		SourceServer->AddUserCount();
	}

	FOREACH_MOD_I(Instance,I_OnPostConnect,OnPostConnect(_new));

	return true;
}

/** Send one or more FJOINs for a channel of users.
 * If the length of a single line is more than 480-NICKMAX
 * in length, it is split over multiple lines.
 */
void TreeSocket::SendFJoins(TreeServer* Current, chanrec* c)
{
	std::string buffer;
	char list[MAXBUF];
	std::string individual_halfops = std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age);

	Instance->Log(DEBUG,"Sending FJOINs for %s", c->name);

	size_t dlen, curlen;
	dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
	int numusers = 0;
	char* ptr = list + dlen;

	CUList *ulist = c->GetUsers();
	std::string modes = "";
	std::string params = "";

	for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
	{
		// The first parameter gets a : before it
		size_t ptrlen = snprintf(ptr, MAXBUF, " %s%s,%s", !numusers ? ":" : "", c->GetAllPrefixChars(i->first), i->first->nick);

		curlen += ptrlen;
		ptr += ptrlen;

		numusers++;

		if (curlen > (480-NICKMAX))
		{
			Instance->Log(DEBUG,"Flushing FJOIN buffer: %s", list);
			buffer.append(list).append("\r\n");
			dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
			ptr = list + dlen;
			ptrlen = 0;
			numusers = 0;
		}
	}

	Instance->Log(DEBUG,"%d users remaining to be flushed", list);

	if (numusers)
	{
		Instance->Log(DEBUG,"Flushing final FJOIN buffer: %s", list);
		buffer.append(list).append("\r\n");
	}

	buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(c->ChanModes(true)).append("\r\n");

	int linesize = 1;
	for (BanList::iterator b = c->bans.begin(); b != c->bans.end(); b++)
	{
		int size = strlen(b->data) + 2;
		int currsize = linesize + size;
		if (currsize <= 350)
		{
			modes.append("b");
			params.append(" ").append(b->data);
			linesize += size; 
		}
		if ((params.length() >= MAXMODES) || (currsize > 350))
		{
			/* Wrap at MAXMODES */
			buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params).append("\r\n");
			modes = "";
			params = "";
			linesize = 1;
		}
	}

	/* Only send these if there are any */
	if (!modes.empty())
		buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params);

	this->WriteLine(buffer);
}

/** Send G, Q, Z and E lines */
void TreeSocket::SendXLines(TreeServer* Current)
{
	char data[MAXBUF];
	std::string buffer;
	std::string n = this->Instance->Config->ServerName;
	const char* sn = n.c_str();
	/* Yes, these arent too nice looking, but they get the job done */
	for (std::vector<ZLine*>::iterator i = Instance->XLines->zlines.begin(); i != Instance->XLines->zlines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<QLine*>::iterator i = Instance->XLines->qlines.begin(); i != Instance->XLines->qlines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<GLine*>::iterator i = Instance->XLines->glines.begin(); i != Instance->XLines->glines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<ELine*>::iterator i = Instance->XLines->elines.begin(); i != Instance->XLines->elines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<ZLine*>::iterator i = Instance->XLines->pzlines.begin(); i != Instance->XLines->pzlines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<QLine*>::iterator i = Instance->XLines->pqlines.begin(); i != Instance->XLines->pqlines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<GLine*>::iterator i = Instance->XLines->pglines.begin(); i != Instance->XLines->pglines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}
	for (std::vector<ELine*>::iterator i = Instance->XLines->pelines.begin(); i != Instance->XLines->pelines.end(); i++)
	{
		snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
		buffer.append(data);
	}

	if (!buffer.empty())
		this->WriteLine(buffer);
}

/** Send channel modes and topics */
void TreeSocket::SendChannelModes(TreeServer* Current)
{
	char data[MAXBUF];
	std::deque<std::string> list;
	std::string n = this->Instance->Config->ServerName;
	const char* sn = n.c_str();
	Instance->Log(DEBUG,"Sending channels and modes, %d to send", this->Instance->chanlist->size());
	for (chan_hash::iterator c = this->Instance->chanlist->begin(); c != this->Instance->chanlist->end(); c++)
	{
		SendFJoins(Current, c->second);
		if (*c->second->topic)
		{
			snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",sn,c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic);
			this->WriteLine(data);
		}
		FOREACH_MOD_I(this->Instance,I_OnSyncChannel,OnSyncChannel(c->second,(Module*)Utils->Creator,(void*)this));
		list.clear();
		c->second->GetExtList(list);
		for (unsigned int j = 0; j < list.size(); j++)
		{
			FOREACH_MOD_I(this->Instance,I_OnSyncChannelMetaData,OnSyncChannelMetaData(c->second,(Module*)Utils->Creator,(void*)this,list[j]));
		}
	}
}

/** send all users and their oper state/modes */
void TreeSocket::SendUsers(TreeServer* Current)
{
	char data[MAXBUF];
	std::deque<std::string> list;
	std::string dataline;
	for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
	{
		if (u->second->registered == REG_ALL)
		{
			snprintf(data,MAXBUF,":%s NICK %lu %s %s %s %s +%s %s :%s",u->second->server,(unsigned long)u->second->age,u->second->nick,u->second->host,u->second->dhost,u->second->ident,u->second->FormatModes(),u->second->GetIPString(),u->second->fullname);
			this->WriteLine(data);
			if (*u->second->oper)
			{
				snprintf(data,MAXBUF,":%s OPERTYPE %s", u->second->nick, u->second->oper);
				this->WriteLine(data);
			}
			if (*u->second->awaymsg)
			{
				snprintf(data,MAXBUF,":%s AWAY :%s", u->second->nick, u->second->awaymsg);
				this->WriteLine(data);
			}
		}
	}
	for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
	{
		FOREACH_MOD_I(this->Instance,I_OnSyncUser,OnSyncUser(u->second,(Module*)Utils->Creator,(void*)this));
		list.clear();
		u->second->GetExtList(list);
		for (unsigned int j = 0; j < list.size(); j++)
		{
			FOREACH_MOD_I(this->Instance,I_OnSyncUserMetaData,OnSyncUserMetaData(u->second,(Module*)Utils->Creator,(void*)this,list[j]));
		}
	}
}

/** This function is called when we want to send a netburst to a local
 * server. There is a set order we must do this, because for example
 * users require their servers to exist, and channels require their
 * users to exist. You get the idea.
 */
void TreeSocket::DoBurst(TreeServer* s)
{
	std::string name = s->GetName();
	std::string burst = "BURST "+ConvToStr(Instance->Time(true));
	std::string endburst = "ENDBURST";
	this->Instance->SNO->WriteToSnoMask('l',"Bursting to \2%s\2 (Authentication: %s).", name.c_str(), this->GetTheirChallenge().empty() ? "plaintext password" : "SHA256-HMAC challenge-response");
	this->WriteLine(burst);
	/* send our version string */
	this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" VERSION :"+this->Instance->GetVersionString());
	/* Send server tree */
	this->SendServers(Utils->TreeRoot,s,1);
	/* Send users and their oper status */
	this->SendUsers(s);
	/* Send everything else (channel modes, xlines etc) */
	this->SendChannelModes(s);
	this->SendXLines(s);
	FOREACH_MOD_I(this->Instance,I_OnSyncOtherMetaData,OnSyncOtherMetaData((Module*)Utils->Creator,(void*)this));
	this->WriteLine(endburst);
	this->Instance->SNO->WriteToSnoMask('l',"Finished bursting to \2"+name+"\2.");
}

/** This function is called when we receive data from a remote
 * server. We buffer the data in a std::string (it doesnt stay
 * there for long), reading using InspSocket::Read() which can
 * read up to 16 kilobytes in one operation.
 *
 * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
 * THE SOCKET OBJECT FOR US.
 */
bool TreeSocket::OnDataReady()
{
	char* data = this->Read();
	/* Check that the data read is a valid pointer and it has some content */
	if (data && *data)
	{
		this->in_buffer.append(data);
		/* While there is at least one new line in the buffer,
		 * do something useful (we hope!) with it.
		 */
		while (in_buffer.find("\n") != std::string::npos)
		{
			std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
			in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
			/* Use rfind here not find, as theres more
			 * chance of the \r being near the end of the
			 * string, not the start.
			 */
			if (ret.find("\r") != std::string::npos)
				ret = in_buffer.substr(0,in_buffer.find("\r")-1);
			/* Process this one, abort if it
			 * didnt return true.
			 */
			if (!this->ProcessLine(ret))
			{
				return false;
			}
		}
		return true;
	}
	/* EAGAIN returns an empty but non-NULL string, so this
	 * evaluates to TRUE for EAGAIN but to FALSE for EOF.
	 */
	return (data && !*data);
}