summaryrefslogtreecommitdiff
path: root/os/connection.c
blob: b339f4e96e74fd9588db2396ab8fb094d9d2457b (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
/***********************************************************

Copyright 1987, 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.


Copyright 1987, 1989 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/
/*****************************************************************
 *  Stuff to create connections --- OS dependent
 *
 *      EstablishNewConnections, CreateWellKnownSockets, ResetWellKnownSockets,
 *      CloseDownConnection, CheckConnections, AddEnabledDevice,
 *	RemoveEnabledDevice, OnlyListToOneClient,
 *      ListenToAllClients,
 *
 *      (WaitForSomething is in its own file)
 *
 *      In this implementation, a client socket table is not kept.
 *      Instead, what would be the index into the table is just the
 *      file descriptor of the socket.  This won't work for if the
 *      socket ids aren't small nums (0 - 2^8)
 *
 *****************************************************************/

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#ifdef WIN32
#include <X11/Xwinsock.h>
#endif
#include <X11/X.h>
#include <X11/Xproto.h>
#define XSERV_t
#define TRANS_SERVER
#define TRANS_REOPEN
#include <X11/Xtrans/Xtrans.h>
#include <X11/Xtrans/Xtransint.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

#ifndef WIN32
#include <sys/socket.h>



#if defined(TCPCONN) || defined(STREAMSCONN)
# include <netinet/in.h>
# include <arpa/inet.h>
#  ifdef apollo
#   ifndef NO_TCP_H
#    include <netinet/tcp.h>
#   endif
#  else
#   ifdef CSRG_BASED
#    include <sys/param.h>
#   endif
#   include <netinet/tcp.h>
#  endif
# include <arpa/inet.h>
#endif

#include <sys/uio.h>

#endif /* WIN32 */
#include "misc.h"		/* for typedef of pointer */
#include "osdep.h"
#include <X11/Xpoll.h>
#include "opaque.h"
#include "dixstruct.h"
#include "xace.h"

#define Pid_t pid_t


#ifdef HAS_GETPEERUCRED
# include <ucred.h>
# include <zone.h>
#endif

#ifdef XSERVER_DTRACE
# include <sys/types.h>
typedef const char *string;
# ifndef HAS_GETPEERUCRED
#  define zoneid_t int
# endif
# include "../dix/Xserver-dtrace.h"
#endif

static int lastfdesc;		/* maximum file descriptor */

fd_set WellKnownConnections;	/* Listener mask */
fd_set EnabledDevices;		/* mask for input devices that are on */
fd_set AllSockets;		/* select on this */
fd_set AllClients;		/* available clients */
fd_set LastSelectMask;		/* mask returned from last select call */
fd_set ClientsWithInput;	/* clients with FULL requests in buffer */
fd_set ClientsWriteBlocked;	/* clients who cannot receive output */
fd_set OutputPending;		/* clients with reply/event data ready to go */
int MaxClients = 0;
Bool NewOutputPending;		/* not yet attempted to write some new output */
Bool AnyClientsWriteBlocked;	/* true if some client blocked on write */

static Bool RunFromSmartParent;	/* send SIGUSR1 to parent process */
Bool RunFromSigStopParent;	/* send SIGSTOP to our own process; Upstart (or
				   equivalent) will send SIGCONT back. */
Bool PartialNetwork;	/* continue even if unable to bind all addrs */
static Pid_t ParentProcess;

static Bool debug_conns = FALSE;

fd_set IgnoredClientsWithInput;
static fd_set GrabImperviousClients;
static fd_set SavedAllClients;
static fd_set SavedAllSockets;
static fd_set SavedClientsWithInput;
int GrabInProgress = 0;

#if !defined(WIN32)
int *ConnectionTranslation = NULL;
#else
/*
 * On NT fds are not between 0 and MAXSOCKS, they are unrelated, and there is
 * not even a known maximum value, so use something quite arbitrary for now.
 * Do storage is a hash table of size 256. Collisions are handled in a linked
 * list.
 */

#undef MAXSOCKS
#define MAXSOCKS 500
#undef MAXSELECT
#define MAXSELECT 500

struct _ct_node {
    struct _ct_node *next;
    int key;
    int value;
};

struct _ct_node *ct_head[256];

void InitConnectionTranslation(void)
{
    memset(ct_head, 0, sizeof(ct_head));
}

int GetConnectionTranslation(int conn)
{
    struct _ct_node *node = ct_head[conn & 0xff];
    while (node != NULL)
    {
        if (node->key == conn)
            return node->value;
        node = node->next;
    }
    return 0;
}

void SetConnectionTranslation(int conn, int client)
{
    struct _ct_node **node = ct_head + (conn & 0xff);
    if (client == 0) /* remove entry */
    {
        while (*node != NULL)
        {
            if ((*node)->key == conn)
            {
                struct _ct_node *temp = *node;
                *node = (*node)->next;
                free(temp);
                return;
            }
            node = &((*node)->next);
        }
        return;
    } else 
    {
        while (*node != NULL)
        {
            if ((*node)->key == conn)
            {
                (*node)->value = client;
                return;
            }
            node = &((*node)->next);
        }
        *node = malloc(sizeof(struct _ct_node));
        (*node)->next = NULL;
        (*node)->key = conn;
        (*node)->value = client;
        return;
    }
}

void ClearConnectionTranslation(void)
{
    unsigned i;
    for (i = 0; i < 256; i++)
    {
        struct _ct_node *node = ct_head[i];
        while (node != NULL)
        {
            struct _ct_node *temp = node;
            node = node->next;
            free(temp);
        }
    }
}
#endif

static XtransConnInfo 	*ListenTransConns = NULL;
static int	       	*ListenTransFds = NULL;
static int		ListenTransCount;

static void ErrorConnMax(XtransConnInfo /* trans_conn */);

static XtransConnInfo
lookup_trans_conn (int fd)
{
    if (ListenTransFds)
    {
	int i;
	for (i = 0; i < ListenTransCount; i++)
	    if (ListenTransFds[i] == fd)
		return ListenTransConns[i];
    }

    return NULL;
}

/* Set MaxClients and lastfdesc, and allocate ConnectionTranslation */

void
InitConnectionLimits(void)
{
    lastfdesc = -1;

#ifndef __CYGWIN__

#if !defined(XNO_SYSCONF) && defined(_SC_OPEN_MAX)
    lastfdesc = sysconf(_SC_OPEN_MAX) - 1;
#endif

#ifdef HAS_GETDTABLESIZE
    if (lastfdesc < 0)
	lastfdesc = getdtablesize() - 1;
#endif

#ifdef _NFILE
    if (lastfdesc < 0)
	lastfdesc = _NFILE - 1;
#endif

#endif /* __CYGWIN__ */

    /* This is the fallback */
    if (lastfdesc < 0)
	lastfdesc = MAXSOCKS;

    if (lastfdesc > MAXSELECT)
	lastfdesc = MAXSELECT;

    if (lastfdesc > MAXCLIENTS)
    {
	lastfdesc = MAXCLIENTS;
	if (debug_conns)
	    ErrorF( "REACHED MAXIMUM CLIENTS LIMIT %d\n", MAXCLIENTS);
    }
    MaxClients = lastfdesc;

#ifdef DEBUG
    ErrorF("InitConnectionLimits: MaxClients = %d\n", MaxClients);
#endif

#if !defined(WIN32)
    if (!ConnectionTranslation)
        ConnectionTranslation = (int *)xnfalloc(sizeof(int)*(lastfdesc + 1));
#else
    InitConnectionTranslation();
#endif
}

/*
 * If SIGUSR1 was set to SIG_IGN when the server started, assume that either
 *
 *  a- The parent process is ignoring SIGUSR1
 *
 * or
 *
 *  b- The parent process is expecting a SIGUSR1
 *     when the server is ready to accept connections
 *
 * In the first case, the signal will be harmless, in the second case,
 * the signal will be quite useful.
 */
static void
InitParentProcess(void)
{
#if !defined(WIN32)
    OsSigHandlerPtr handler;
    handler = OsSignal (SIGUSR1, SIG_IGN);
    if ( handler == SIG_IGN)
	RunFromSmartParent = TRUE;
    OsSignal(SIGUSR1, handler);
    ParentProcess = getppid ();
#endif
}

void
NotifyParentProcess(void)
{
#if !defined(WIN32)
    if (RunFromSmartParent) {
	if (ParentProcess > 1) {
	    kill (ParentProcess, SIGUSR1);
	}
    }
    if (RunFromSigStopParent)
	raise (SIGSTOP);
#endif
}

/*****************
 * CreateWellKnownSockets
 *    At initialization, create the sockets to listen on for new clients.
 *****************/

void
CreateWellKnownSockets(void)
{
    int		i;
    int		partial;
    char 	port[20];

    FD_ZERO(&AllSockets);
    FD_ZERO(&AllClients);
    FD_ZERO(&LastSelectMask);
    FD_ZERO(&ClientsWithInput);

#if !defined(WIN32)
    for (i=0; i<MaxClients; i++) ConnectionTranslation[i] = 0;
#else
    ClearConnectionTranslation();
#endif

    FD_ZERO (&WellKnownConnections);

    sprintf (port, "%d", atoi (display));

    if ((_XSERVTransMakeAllCOTSServerListeners (port, &partial,
	&ListenTransCount, &ListenTransConns) >= 0) &&
	(ListenTransCount >= 1))
    {
	if (!PartialNetwork && partial)
	{
	    FatalError ("Failed to establish all listening sockets");
	}
	else
	{
	    ListenTransFds = malloc(ListenTransCount * sizeof (int));

	    for (i = 0; i < ListenTransCount; i++)
	    {
		int fd = _XSERVTransGetConnectionNumber (ListenTransConns[i]);
		
		ListenTransFds[i] = fd;
		FD_SET (fd, &WellKnownConnections);

		if (!_XSERVTransIsLocal (ListenTransConns[i]))
		{
		    DefineSelf (fd);
		}
	    }
	}
    }

    if (!XFD_ANYSET (&WellKnownConnections))
        FatalError ("Cannot establish any listening sockets - Make sure an X server isn't already running");
#if !defined(WIN32)
    OsSignal (SIGPIPE, SIG_IGN);
    OsSignal (SIGHUP, AutoResetServer);
#endif
    OsSignal (SIGINT, GiveUp);
    OsSignal (SIGTERM, GiveUp);
    XFD_COPYSET (&WellKnownConnections, &AllSockets);
    ResetHosts(display);

    InitParentProcess();

#ifdef XDMCP
    XdmcpInit ();
#endif
}

void
ResetWellKnownSockets (void)
{
    int i;

    ResetOsBuffers();

    for (i = 0; i < ListenTransCount; i++)
    {
	int status = _XSERVTransResetListener (ListenTransConns[i]);

	if (status != TRANS_RESET_NOOP)
	{
	    if (status == TRANS_RESET_FAILURE)
	    {
		/*
		 * ListenTransConns[i] freed by xtrans.
		 * Remove it from out list.
		 */

		FD_CLR (ListenTransFds[i], &WellKnownConnections);
		ListenTransFds[i] = ListenTransFds[ListenTransCount - 1];
		ListenTransConns[i] = ListenTransConns[ListenTransCount - 1];
		ListenTransCount -= 1;
		i -= 1;
	    }
	    else if (status == TRANS_RESET_NEW_FD)
	    {
		/*
		 * A new file descriptor was allocated (the old one was closed)
		 */

		int newfd = _XSERVTransGetConnectionNumber (ListenTransConns[i]);

		FD_CLR (ListenTransFds[i], &WellKnownConnections);
		ListenTransFds[i] = newfd;
		FD_SET(newfd, &WellKnownConnections);
	    }
	}
    }

    ResetAuthorization ();
    ResetHosts(display);
    /*
     * restart XDMCP
     */
#ifdef XDMCP
    XdmcpReset ();
#endif
}

void
CloseWellKnownConnections(void)
{
    int i;

    for (i = 0; i < ListenTransCount; i++)
	_XSERVTransClose (ListenTransConns[i]);
}

static void
AuthAudit (ClientPtr client, Bool letin, 
    struct sockaddr *saddr, int len, 
    unsigned int proto_n, char *auth_proto, int auth_id)
{
    char addr[128];
    char *out = addr;
    char client_uid_string[64];
    LocalClientCredRec *lcc;
#ifdef XSERVER_DTRACE
    pid_t client_pid = -1;
    zoneid_t client_zid = -1;
#endif

    if (!len)
        strcpy(out, "local host");
    else
	switch (saddr->sa_family)
	{
	case AF_UNSPEC:
#if defined(UNIXCONN) || defined(LOCALCONN)
	case AF_UNIX:
#endif
	    strcpy(out, "local host");
	    break;
#if defined(TCPCONN) || defined(STREAMSCONN)
	case AF_INET:
	    sprintf(out, "IP %s",
		inet_ntoa(((struct sockaddr_in *) saddr)->sin_addr));
	    break;
#if defined(IPv6) && defined(AF_INET6)
	case AF_INET6: {
	    char ipaddr[INET6_ADDRSTRLEN];
	    inet_ntop(AF_INET6, &((struct sockaddr_in6 *) saddr)->sin6_addr,
	      ipaddr, sizeof(ipaddr));
	    sprintf(out, "IP %s", ipaddr);
	}
	    break;
#endif
#endif
	default:
	    strcpy(out, "unknown address");
	}

    if (GetLocalClientCreds(client, &lcc) != -1) {
	int slen; /* length written to client_uid_string */

	strcpy(client_uid_string, " ( ");
	slen = 3;

	if (lcc->fieldsSet & LCC_UID_SET) {
	    snprintf(client_uid_string + slen,
		     sizeof(client_uid_string) - slen,
		     "uid=%ld ", (long) lcc->euid);
	    slen = strlen(client_uid_string);
	}

	if (lcc->fieldsSet & LCC_GID_SET) {
	    snprintf(client_uid_string + slen,
		     sizeof(client_uid_string) - slen,
		     "gid=%ld ", (long) lcc->egid);
	    slen = strlen(client_uid_string);
	}

	if (lcc->fieldsSet & LCC_PID_SET) {
#ifdef XSERVER_DTRACE	    
	    client_pid = lcc->pid;
#endif
	    snprintf(client_uid_string + slen,
		     sizeof(client_uid_string) - slen,
		     "pid=%ld ", (long) lcc->pid);
	    slen = strlen(client_uid_string);
	}
	
	if (lcc->fieldsSet & LCC_ZID_SET) {
#ifdef XSERVER_DTRACE
	    client_zid = lcc->zoneid;
#endif	    
	    snprintf(client_uid_string + slen,
		     sizeof(client_uid_string) - slen,
		     "zoneid=%ld ", (long) lcc->zoneid);
	    slen = strlen(client_uid_string);
	}

	snprintf(client_uid_string + slen, sizeof(client_uid_string) - slen,
		 ")");
	FreeLocalClientCreds(lcc);
    }
    else {
	client_uid_string[0] = '\0';
    }
    
#ifdef XSERVER_DTRACE
    XSERVER_CLIENT_AUTH(client->index, addr, client_pid, client_zid);
#endif
    if (auditTrailLevel > 1) {
      if (proto_n)
	AuditF("client %d %s from %s%s\n  Auth name: %.*s ID: %d\n", 
	       client->index, letin ? "connected" : "rejected", addr,
	       client_uid_string, (int)proto_n, auth_proto, auth_id);
      else 
	AuditF("client %d %s from %s%s\n", 
	       client->index, letin ? "connected" : "rejected", addr,
	       client_uid_string);

    }
}

XID
AuthorizationIDOfClient(ClientPtr client)
{
    if (client->osPrivate)
	return ((OsCommPtr)client->osPrivate)->auth_id;
    else
	return None;
}


/*****************************************************************
 * ClientAuthorized
 *
 *    Sent by the client at connection setup:
 *                typedef struct _xConnClientPrefix {
 *                   CARD8	byteOrder;
 *                   BYTE	pad;
 *                   CARD16	majorVersion, minorVersion;
 *                   CARD16	nbytesAuthProto;    
 *                   CARD16	nbytesAuthString;   
 *                 } xConnClientPrefix;
 *
 *     	It is hoped that eventually one protocol will be agreed upon.  In the
 *        mean time, a server that implements a different protocol than the
 *        client expects, or a server that only implements the host-based
 *        mechanism, will simply ignore this information.
 *
 *****************************************************************/

char *
ClientAuthorized(ClientPtr client, 
    unsigned int proto_n, char *auth_proto, 
    unsigned int string_n, char *auth_string)
{
    OsCommPtr 		priv;
    Xtransaddr		*from = NULL;
    int 		family;
    int			fromlen;
    XID	 		auth_id;
    char	 	*reason = NULL;
    XtransConnInfo	trans_conn;

    priv = (OsCommPtr)client->osPrivate;
    trans_conn = priv->trans_conn;

    /* Allow any client to connect without authorization on a launchd socket,
       because it is securely created -- this prevents a race condition on launch */
    if(trans_conn->flags & TRANS_NOXAUTH) {
        auth_id = (XID) 0L;
    } else {
        auth_id = CheckAuthorization (proto_n, auth_proto, string_n, auth_string, client, &reason);
    }

    if (auth_id == (XID) ~0L)
    {
	if (_XSERVTransGetPeerAddr(trans_conn, &family, &fromlen, &from) != -1)
	{
	    if (InvalidHost ((struct sockaddr *) from, fromlen, client))
		AuthAudit(client, FALSE, (struct sockaddr *) from,
			  fromlen, proto_n, auth_proto, auth_id);
	    else
	    {
		auth_id = (XID) 0;
#ifdef XSERVER_DTRACE
		if ((auditTrailLevel > 1) || XSERVER_CLIENT_AUTH_ENABLED())
#else
		if (auditTrailLevel > 1)
#endif
		    AuthAudit(client, TRUE,
			(struct sockaddr *) from, fromlen,
			proto_n, auth_proto, auth_id);
	    }

	    free(from);
	}

	if (auth_id == (XID) ~0L) {
	    if (reason)
		return reason;
	    else
		return "Client is not authorized to connect to Server";
	}
    }
#ifdef XSERVER_DTRACE
    else if ((auditTrailLevel > 1) || XSERVER_CLIENT_AUTH_ENABLED())
#else
    else if (auditTrailLevel > 1)
#endif
    {
	if (_XSERVTransGetPeerAddr (trans_conn,
	    &family, &fromlen, &from) != -1)
	{
	    AuthAudit(client, TRUE, (struct sockaddr *) from, fromlen,
		      proto_n, auth_proto, auth_id);

	    free(from);
	}
    }
    priv->auth_id = auth_id;
    priv->conn_time = 0;

#ifdef XDMCP
    /* indicate to Xdmcp protocol that we've opened new client */
    XdmcpOpenDisplay(priv->fd);
#endif /* XDMCP */

    XaceHook(XACE_AUTH_AVAIL, client, auth_id);

    /* At this point, if the client is authorized to change the access control
     * list, we should getpeername() information, and add the client to
     * the selfhosts list.  It's not really the host machine, but the
     * true purpose of the selfhosts list is to see who may change the
     * access control list.
     */
    return((char *)NULL);
}

static ClientPtr
AllocNewConnection (XtransConnInfo trans_conn, int fd, CARD32 conn_time)
{
    OsCommPtr	oc;
    ClientPtr	client;
    
    if (
#ifndef WIN32
	fd >= lastfdesc
#else
	XFD_SETCOUNT(&AllClients) >= MaxClients
#endif
	)
	return NullClient;
    oc = malloc(sizeof(OsCommRec));
    if (!oc)
	return NullClient;
    oc->trans_conn = trans_conn;
    oc->fd = fd;
    oc->input = (ConnectionInputPtr)NULL;
    oc->output = (ConnectionOutputPtr)NULL;
    oc->auth_id = None;
    oc->conn_time = conn_time;
    if (!(client = NextAvailableClient((pointer)oc)))
    {
	free(oc);
	return NullClient;
    }
    oc->local_client = ComputeLocalClient(client);
#if !defined(WIN32)
    ConnectionTranslation[fd] = client->index;
#else
    SetConnectionTranslation(fd, client->index);
#endif
    if (GrabInProgress)
    {
        FD_SET(fd, &SavedAllClients);
        FD_SET(fd, &SavedAllSockets);
    }
    else
    {
        FD_SET(fd, &AllClients);
        FD_SET(fd, &AllSockets);
    }

#ifdef DEBUG
    ErrorF("AllocNewConnection: client index = %d, socket fd = %d\n",
	   client->index, fd);
#endif
#ifdef XSERVER_DTRACE
    XSERVER_CLIENT_CONNECT(client->index, fd);
#endif	

    return client;
}

/*****************
 * EstablishNewConnections
 *    If anyone is waiting on listened sockets, accept them.
 *    Returns a mask with indices of new clients.  Updates AllClients
 *    and AllSockets.
 *****************/

/*ARGSUSED*/
Bool
EstablishNewConnections(ClientPtr clientUnused, pointer closure)
{
    fd_set  readyconnections;     /* set of listeners that are ready */
    int curconn;                  /* fd of listener that's ready */
    register int newconn;         /* fd of new client */
    CARD32 connect_time;
    register int i;
    register ClientPtr client;
    register OsCommPtr oc;
    fd_set tmask;

    XFD_ANDSET (&tmask, (fd_set*)closure, &WellKnownConnections);
    XFD_COPYSET(&tmask, &readyconnections);
    if (!XFD_ANYSET(&readyconnections))
	return TRUE;
    connect_time = GetTimeInMillis();
    /* kill off stragglers */
    for (i=1; i<currentMaxClients; i++)
    {
	if ((client = clients[i]))
	{
	    oc = (OsCommPtr)(client->osPrivate);
	    if ((oc && (oc->conn_time != 0) &&
		(connect_time - oc->conn_time) >= TimeOutValue) || 
		(client->noClientException != Success && !client->clientGone))
		CloseDownClient(client);     
	}
    }
#ifndef WIN32
    for (i = 0; i < howmany(XFD_SETSIZE, NFDBITS); i++)
    {
      while (readyconnections.fds_bits[i])
#else
      for (i = 0; i < XFD_SETCOUNT(&readyconnections); i++) 
#endif
      {
	XtransConnInfo trans_conn, new_trans_conn;
	int status;

#ifndef WIN32
	curconn = mffs (readyconnections.fds_bits[i]) - 1;
	readyconnections.fds_bits[i] &= ~((fd_mask)1 << curconn);
	curconn += (i * (sizeof(fd_mask)*8));
#else
	curconn = XFD_FD(&readyconnections, i);
#endif

	if ((trans_conn = lookup_trans_conn (curconn)) == NULL)
	    continue;

	if ((new_trans_conn = _XSERVTransAccept (trans_conn, &status)) == NULL)
	    continue;

	newconn = _XSERVTransGetConnectionNumber (new_trans_conn);

	if (newconn < lastfdesc)
	{
		int clientid;
#if !defined(WIN32)
  		clientid = ConnectionTranslation[newconn];
#else
  		clientid = GetConnectionTranslation(newconn);
#endif
		if(clientid && (client = clients[clientid]))
 			CloseDownClient(client);
	}

	_XSERVTransSetOption(new_trans_conn, TRANS_NONBLOCKING, 1);

	if(trans_conn->flags & TRANS_NOXAUTH)
	    new_trans_conn->flags = new_trans_conn->flags | TRANS_NOXAUTH;

	if (!AllocNewConnection (new_trans_conn, newconn, connect_time))
	{
	    ErrorConnMax(new_trans_conn);
	    _XSERVTransClose(new_trans_conn);
	}
      }
#ifndef WIN32
    }
#endif
    return TRUE;
}

#define NOROOM "Maximum number of clients reached"

/************
 *   ErrorConnMax
 *     Fail a connection due to lack of client or file descriptor space
 ************/

static void
ErrorConnMax(XtransConnInfo trans_conn)
{
    int fd = _XSERVTransGetConnectionNumber (trans_conn);
    xConnSetupPrefix csp;
    char pad[3];
    struct iovec iov[3];
    char byteOrder = 0;
    int whichbyte = 1;
    struct timeval waittime;
    fd_set mask;

    /* if these seems like a lot of trouble to go to, it probably is */
    waittime.tv_sec = BOTIMEOUT / MILLI_PER_SECOND;
    waittime.tv_usec = (BOTIMEOUT % MILLI_PER_SECOND) *
		       (1000000 / MILLI_PER_SECOND);
    FD_ZERO(&mask);
    FD_SET(fd, &mask);
    (void)Select(fd + 1, &mask, NULL, NULL, &waittime);
    /* try to read the byte-order of the connection */
    (void)_XSERVTransRead(trans_conn, &byteOrder, 1);
    if ((byteOrder == 'l') || (byteOrder == 'B'))
    {
	csp.success = xFalse;
	csp.lengthReason = sizeof(NOROOM) - 1;
	csp.length = (sizeof(NOROOM) + 2) >> 2;
	csp.majorVersion = X_PROTOCOL;
	csp.minorVersion = X_PROTOCOL_REVISION;
	if (((*(char *) &whichbyte) && (byteOrder == 'B')) ||
	    (!(*(char *) &whichbyte) && (byteOrder == 'l')))
	{
	    swaps(&csp.majorVersion);
	    swaps(&csp.minorVersion);
	    swaps(&csp.length);
	}
	iov[0].iov_len = sz_xConnSetupPrefix;
	iov[0].iov_base = (char *) &csp;
	iov[1].iov_len = csp.lengthReason;
	iov[1].iov_base = NOROOM;
	iov[2].iov_len = (4 - (csp.lengthReason & 3)) & 3;
	iov[2].iov_base = pad;
	(void)_XSERVTransWritev(trans_conn, iov, 3);
    }
}

/************
 *   CloseDownFileDescriptor:
 *     Remove this file descriptor and it's I/O buffers, etc.
 ************/

static void
CloseDownFileDescriptor(OsCommPtr oc)
{
    int connection = oc->fd;

    if (oc->trans_conn) {
	_XSERVTransDisconnect(oc->trans_conn);
	_XSERVTransClose(oc->trans_conn);
    }
#ifndef WIN32
    ConnectionTranslation[connection] = 0;
#else
    SetConnectionTranslation(connection, 0);
#endif    
    FD_CLR(connection, &AllSockets);
    FD_CLR(connection, &AllClients);
    FD_CLR(connection, &ClientsWithInput);
    FD_CLR(connection, &GrabImperviousClients);
    if (GrabInProgress)
    {
	FD_CLR(connection, &SavedAllSockets);
	FD_CLR(connection, &SavedAllClients);
	FD_CLR(connection, &SavedClientsWithInput);
    }
    FD_CLR(connection, &ClientsWriteBlocked);
    if (!XFD_ANYSET(&ClientsWriteBlocked))
    	AnyClientsWriteBlocked = FALSE;
    FD_CLR(connection, &OutputPending);
}

/*****************
 * CheckConnections
 *    Some connection has died, go find which one and shut it down 
 *    The file descriptor has been closed, but is still in AllClients.
 *    If would truly be wonderful if select() would put the bogus
 *    file descriptors in the exception mask, but nooooo.  So we have
 *    to check each and every socket individually.
 *****************/

void
CheckConnections(void)
{
#ifndef WIN32
    fd_mask		mask;
#endif
    fd_set		tmask; 
    int			curclient, curoff;
    int			i;
    struct timeval	notime;
    int r;
#ifdef WIN32
    fd_set savedAllClients;
#endif

    notime.tv_sec = 0;
    notime.tv_usec = 0;

#ifndef WIN32
    for (i=0; i<howmany(XFD_SETSIZE, NFDBITS); i++)
    {
	mask = AllClients.fds_bits[i];
        while (mask)
    	{
	    curoff = mffs (mask) - 1;
	    curclient = curoff + (i * (sizeof(fd_mask)*8));
            FD_ZERO(&tmask);
            FD_SET(curclient, &tmask);
            do {
                r = Select (curclient + 1, &tmask, NULL, NULL, &notime);
            } while (r < 0 && (errno == EINTR || errno == EAGAIN));
            if (r < 0)
                if (ConnectionTranslation[curclient] > 0)
                    CloseDownClient(clients[ConnectionTranslation[curclient]]);
	    mask &= ~((fd_mask)1 << curoff);
	}
    }	
#else
    XFD_COPYSET(&AllClients, &savedAllClients);
    for (i = 0; i < XFD_SETCOUNT(&savedAllClients); i++)
    {
	curclient = XFD_FD(&savedAllClients, i);
	FD_ZERO(&tmask);
	FD_SET(curclient, &tmask);
        do {
            r = Select (curclient + 1, &tmask, NULL, NULL, &notime);
        } while (r < 0 && (errno == EINTR || errno == EAGAIN));
	if (r < 0)
            if (GetConnectionTranslation(curclient) > 0)
                CloseDownClient(clients[GetConnectionTranslation(curclient)]);
    }	
#endif
}


/*****************
 * CloseDownConnection
 *    Delete client from AllClients and free resources 
 *****************/

void
CloseDownConnection(ClientPtr client)
{
    OsCommPtr oc = (OsCommPtr)client->osPrivate;

    if (FlushCallback)
	CallCallbacks(&FlushCallback, NULL);

    if (oc->output && oc->output->count)
	FlushClient(client, oc, (char *)NULL, 0);
#ifdef XDMCP
    XdmcpCloseDisplay(oc->fd);
#endif
    CloseDownFileDescriptor(oc);
    FreeOsBuffers(oc);
    free(client->osPrivate);
    client->osPrivate = (pointer)NULL;
    if (auditTrailLevel > 1)
	AuditF("client %d disconnected\n", client->index);
}

void
AddGeneralSocket(int fd)
{
    FD_SET(fd, &AllSockets);
    if (GrabInProgress)
	FD_SET(fd, &SavedAllSockets);
}

void
AddEnabledDevice(int fd)
{
    FD_SET(fd, &EnabledDevices);
    AddGeneralSocket(fd);
}

void
RemoveGeneralSocket(int fd)
{
    FD_CLR(fd, &AllSockets);
    if (GrabInProgress)
	FD_CLR(fd, &SavedAllSockets);
}

void
RemoveEnabledDevice(int fd)
{
    FD_CLR(fd, &EnabledDevices);
    RemoveGeneralSocket(fd);
}

/*****************
 * OnlyListenToOneClient:
 *    Only accept requests from  one client.  Continue to handle new
 *    connections, but don't take any protocol requests from the new
 *    ones.  Note that if GrabInProgress is set, EstablishNewConnections
 *    needs to put new clients into SavedAllSockets and SavedAllClients.
 *    Note also that there is no timeout for this in the protocol.
 *    This routine is "undone" by ListenToAllClients()
 *****************/

int
OnlyListenToOneClient(ClientPtr client)
{
    OsCommPtr oc = (OsCommPtr)client->osPrivate;
    int rc, connection = oc->fd;

    rc = XaceHook(XACE_SERVER_ACCESS, client, DixGrabAccess);
    if (rc != Success)
	return rc;

    if (! GrabInProgress)
    {
	XFD_COPYSET(&ClientsWithInput, &SavedClientsWithInput);
	XFD_ANDSET(&ClientsWithInput,
		       &ClientsWithInput, &GrabImperviousClients);
	if (FD_ISSET(connection, &SavedClientsWithInput))
	{
	    FD_CLR(connection, &SavedClientsWithInput);
	    FD_SET(connection, &ClientsWithInput);
	}
	XFD_UNSET(&SavedClientsWithInput, &GrabImperviousClients);
	XFD_COPYSET(&AllSockets, &SavedAllSockets);
	XFD_COPYSET(&AllClients, &SavedAllClients);
	XFD_UNSET(&AllSockets, &AllClients);
	XFD_ANDSET(&AllClients, &AllClients, &GrabImperviousClients);
	FD_SET(connection, &AllClients);
	XFD_ORSET(&AllSockets, &AllSockets, &AllClients);
	GrabInProgress = client->index;
    }
    return rc;
}

/****************
 * ListenToAllClients:
 *    Undoes OnlyListentToOneClient()
 ****************/

void
ListenToAllClients(void)
{
    if (GrabInProgress)
    {
	XFD_ORSET(&AllSockets, &AllSockets, &SavedAllSockets);
	XFD_ORSET(&AllClients, &AllClients, &SavedAllClients);
	XFD_ORSET(&ClientsWithInput, &ClientsWithInput, &SavedClientsWithInput);
	GrabInProgress = 0;
    }	
}

/****************
 * IgnoreClient
 *    Removes one client from input masks.
 *    Must have cooresponding call to AttendClient.
 ****************/

void
IgnoreClient (ClientPtr client)
{
    OsCommPtr oc = (OsCommPtr)client->osPrivate;
    int connection = oc->fd;

    client->ignoreCount++;
    if (client->ignoreCount > 1)
	return;

    isItTimeToYield = TRUE;
    if (!GrabInProgress || FD_ISSET(connection, &AllClients))
    {
    	if (FD_ISSET (connection, &ClientsWithInput))
	    FD_SET(connection, &IgnoredClientsWithInput);
    	else
	    FD_CLR(connection, &IgnoredClientsWithInput);
    	FD_CLR(connection, &ClientsWithInput);
    	FD_CLR(connection, &AllSockets);
    	FD_CLR(connection, &AllClients);
	FD_CLR(connection, &LastSelectMask);
    }
    else
    {
    	if (FD_ISSET (connection, &SavedClientsWithInput))
	    FD_SET(connection, &IgnoredClientsWithInput);
    	else
	    FD_CLR(connection, &IgnoredClientsWithInput);
	FD_CLR(connection, &SavedClientsWithInput);
	FD_CLR(connection, &SavedAllSockets);
	FD_CLR(connection, &SavedAllClients);
    }
}

/****************
 * AttendClient
 *    Adds one client back into the input masks.
 ****************/

void
AttendClient (ClientPtr client)
{
    OsCommPtr oc = (OsCommPtr)client->osPrivate;
    int connection = oc->fd;

    client->ignoreCount--;
    if (client->ignoreCount)
	return;

    if (!GrabInProgress || GrabInProgress == client->index ||
	FD_ISSET(connection, &GrabImperviousClients))
    {
    	FD_SET(connection, &AllClients);
    	FD_SET(connection, &AllSockets);
	FD_SET(connection, &LastSelectMask);
    	if (FD_ISSET (connection, &IgnoredClientsWithInput))
	    FD_SET(connection, &ClientsWithInput);
    }
    else
    {
	FD_SET(connection, &SavedAllClients);
	FD_SET(connection, &SavedAllSockets);
	if (FD_ISSET(connection, &IgnoredClientsWithInput))
	    FD_SET(connection, &SavedClientsWithInput);
    }
}

/* make client impervious to grabs; assume only executing client calls this */

void
MakeClientGrabImpervious(ClientPtr client)
{
    OsCommPtr oc = (OsCommPtr)client->osPrivate;
    int connection = oc->fd;

    FD_SET(connection, &GrabImperviousClients);

    if (ServerGrabCallback)
    {
	ServerGrabInfoRec grabinfo;
	grabinfo.client = client;
	grabinfo.grabstate  = CLIENT_IMPERVIOUS;
	CallCallbacks(&ServerGrabCallback, &grabinfo);
    }
}

/* make client pervious to grabs; assume only executing client calls this */

void
MakeClientGrabPervious(ClientPtr client)
{
    OsCommPtr oc = (OsCommPtr)client->osPrivate;
    int connection = oc->fd;

    FD_CLR(connection, &GrabImperviousClients);
    if (GrabInProgress && (GrabInProgress != client->index))
    {
	if (FD_ISSET(connection, &ClientsWithInput))
	{
	    FD_SET(connection, &SavedClientsWithInput);
	    FD_CLR(connection, &ClientsWithInput);
	}
	FD_CLR(connection, &AllSockets);
	FD_CLR(connection, &AllClients);
	isItTimeToYield = TRUE;
    }

    if (ServerGrabCallback)
    {
	ServerGrabInfoRec grabinfo;
	grabinfo.client = client;
	grabinfo.grabstate  = CLIENT_PERVIOUS;
	CallCallbacks(&ServerGrabCallback, &grabinfo);
    }
}

#ifdef XQUARTZ
/* Add a fd (from launchd) to our listeners */
void ListenOnOpenFD(int fd, int noxauth) {
    char port[256];
    XtransConnInfo ciptr;
    const char *display_env = getenv("DISPLAY");

    if(display_env && (strncmp(display_env, "/tmp/launch", 11) == 0)) {
        /* Make the path the launchd socket if our DISPLAY is set right */
        strcpy(port, display_env);
    } else {
        /* Just some default so things don't break and die. */
        sprintf(port, ":%d", atoi(display));
    }

    /* Make our XtransConnInfo
     * TRANS_SOCKET_LOCAL_INDEX = 5 from Xtrans.c
     */
    ciptr = _XSERVTransReopenCOTSServer(5, fd, port);
    if(ciptr == NULL) {
        ErrorF("Got NULL while trying to Reopen launchd port.\n");
        return;
    }
    
    if(noxauth)
        ciptr->flags = ciptr->flags | TRANS_NOXAUTH;

    /* Allocate space to store it */
    ListenTransFds = (int *) realloc(ListenTransFds, (ListenTransCount + 1) * sizeof (int));
    ListenTransConns = (XtransConnInfo *) realloc(ListenTransConns, (ListenTransCount + 1) * sizeof (XtransConnInfo));
    
    /* Store it */
    ListenTransConns[ListenTransCount] = ciptr;
    ListenTransFds[ListenTransCount] = fd;

    FD_SET(fd, &WellKnownConnections);
    FD_SET(fd, &AllSockets);
    
    /* Increment the count */
    ListenTransCount++;

    /* This *might* not be needed... /shrug */
    ResetAuthorization();
    ResetHosts(display);
#ifdef XDMCP
    XdmcpReset();
#endif
}

#endif