aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/programs/Xserver/hw/nxagent/Error.c
blob: 0d4ef31070ac28c80843526eac3cd0eae791cdef (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
/**************************************************************************/
/*                                                                        */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com)          */
/* Copyright (c) 2008-2014 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de>  */
/* Copyright (c) 2011-2016 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
/* Copyright (c) 2014-2016 Mihai Moldovan <ionic@ionic.de>                */
/* Copyright (c) 2014-2016 Ulrich Sibiller <uli42@gmx.de>                 */
/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com)           */
/*                                                                        */
/* NXAGENT, NX protocol compression and NX extensions to this software    */
/* are copyright of the aforementioned persons and companies.             */
/*                                                                        */
/* Redistribution and use of the present software is allowed according    */
/* to terms specified in the file LICENSE which comes in the source       */
/* distribution.                                                          */
/*                                                                        */
/* All rights reserved.                                                   */
/*                                                                        */
/* NOTE: This software has received contributions from various other      */
/* contributors, only the core maintainers and supporters are listed as   */
/* copyright holders. Please contact us, if you feel you should be listed */
/* as copyright holder, as well.                                          */
/*                                                                        */
/**************************************************************************/

#include <stdio.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>

#include "os.h"

#include "scrnintstr.h"
#include "Agent.h"

#include "Xlib.h"
#include "Xproto.h"

#include "Error.h"
#include "Args.h"
#include "Utils.h"

/*
 * Set here the required log level.
 */

#define PANIC
#define WARNING
#undef  TEST
#undef  DEBUG


/*
 * Duplicated stderr file descriptor.
 */

static int nxagentStderrDup = -1;

/*
 * Saved stderr file descriptor.
 */

static int nxagentStderrBackup = -1;

/*
 * Clients log file descriptor.
 */

static int nxagentClientsLog = -1;

#define DEFAULT_STRING_LENGTH 256


/*
 * Clients log file name.
 */

char nxagentClientsLogName[NXAGENTCLIENTSLOGNAMELENGTH] = { 0 };

/*
 * User's home.
 */

static char nxagentHomeDir[DEFAULT_STRING_LENGTH] = { 0 };

/*
 * NX root directory.
 */

static char nxagentRootDir[DEFAULT_STRING_LENGTH] = { 0 };

/*
 * Session log Directory.
 */

static char nxagentSessionDir[DEFAULT_STRING_LENGTH] = { 0 };

void nxagentGetClientsPath(void);

static int nxagentPrintError(Display *dpy, XErrorEvent *event, FILE *fp);

/* declare an error handler that does not exit when an error
 * event is caught.
 */

int nxagentErrorHandler(Display *dpy, XErrorEvent *event)
{
  if (nxagentVerbose == 1)
  {
    nxagentPrintError(dpy, event, stderr);
  }

  return 0;
}

/* copied from XlibInt.c */
/* extension stuff roughly commented out */
/* FIXME: why? What's wrong with printing extension stuff?
   We could drop this in favour of _XprintDefaultError then! */
static int nxagentPrintError(dpy, event, fp)
    Display *dpy;
    XErrorEvent *event;
    FILE *fp;
{
    char buffer[BUFSIZ];
    char mesg[BUFSIZ];
    char number[32];
    char *mtype = "XlibMessage";
    /*
    register _XExtension *ext = (_XExtension *)NULL;
    _XExtension *bext = (_XExtension *)NULL;
    */
    XGetErrorText(dpy, event->error_code, buffer, BUFSIZ);
    XGetErrorDatabaseText(dpy, mtype, "XError", "X Error", mesg, BUFSIZ);
    (void) fprintf(fp, "%s:  %s\n  ", mesg, buffer);
    XGetErrorDatabaseText(dpy, mtype, "MajorCode", "Request Major code %d",
	mesg, BUFSIZ);
    (void) fprintf(fp, mesg, event->request_code);
    if (event->request_code < 128) {
	snprintf(number, sizeof(number), "%d", event->request_code);
	XGetErrorDatabaseText(dpy, "XRequest", number, "", buffer, BUFSIZ);
    } else {
      /*	for (ext = dpy->ext_procs;
	     ext && (ext->codes.major_opcode != event->request_code);
	     ext = ext->next)
	  ;
	if (ext)
	    strncpy(buffer, ext->name, BUFSIZ);
	else
      */
	    buffer[0] = '\0';
    }
    (void) fprintf(fp, " (%s)\n", buffer);
    if (event->request_code >= 128) {
	XGetErrorDatabaseText(dpy, mtype, "MinorCode", "Request Minor code %d",
			      mesg, BUFSIZ);
	fputs("  ", fp);
	(void) fprintf(fp, mesg, event->minor_code);
	/*
	if (ext) {
	    snprintf(mesg, sizeof(mesg), "%s.%d", ext->name, event->minor_code);
	    XGetErrorDatabaseText(dpy, "XRequest", mesg, "", buffer, BUFSIZ);
	    (void) fprintf(fp, " (%s)", buffer);
	}
	*/
	fputs("\n", fp);
    }
    if (event->error_code >= 128) {
	/* kludge, try to find the extension that caused it */
	buffer[0] = '\0';
	/*
	for (ext = dpy->ext_procs; ext; ext = ext->next) {
	    if (ext->error_string)
		(*ext->error_string)(dpy, event->error_code, &ext->codes,
				     buffer, BUFSIZ);
	    if (buffer[0]) {
		bext = ext;
		break;
	    }
	    if (ext->codes.first_error &&
		ext->codes.first_error < (int)event->error_code &&
		(!bext || ext->codes.first_error > bext->codes.first_error))
		bext = ext;
	}
	if (bext)
	    snprintf(buffer, sizeof(buffer), "%s.%d", bext->name,
		    event->error_code - bext->codes.first_error);
	else
	*/
	    strcpy(buffer, "Value");
	XGetErrorDatabaseText(dpy, mtype, buffer, "", mesg, BUFSIZ);
	if (mesg[0]) {
	    fputs("  ", fp);
	    (void) fprintf(fp, mesg, event->resourceid);
	    fputs("\n", fp);
	}
	/* let extensions try to print the values */
	/*
	for (ext = dpy->ext_procs; ext; ext = ext->next) {
	    if (ext->error_values)
		(*ext->error_values)(dpy, event, fp);
	}
	*/
    } else if ((event->error_code == BadWindow) ||
	       (event->error_code == BadPixmap) ||
	       (event->error_code == BadCursor) ||
	       (event->error_code == BadFont) ||
	       (event->error_code == BadDrawable) ||
	       (event->error_code == BadColor) ||
	       (event->error_code == BadGC) ||
	       (event->error_code == BadIDChoice) ||
	       (event->error_code == BadValue) ||
	       (event->error_code == BadAtom)) {
	if (event->error_code == BadValue)
	    XGetErrorDatabaseText(dpy, mtype, "Value", "Value 0x%x",
				  mesg, BUFSIZ);
	else if (event->error_code == BadAtom)
	    XGetErrorDatabaseText(dpy, mtype, "AtomID", "AtomID 0x%x",
				  mesg, BUFSIZ);
	else
	    XGetErrorDatabaseText(dpy, mtype, "ResourceID", "ResourceID 0x%x",
				  mesg, BUFSIZ);
	fputs("  ", fp);
	(void) fprintf(fp, mesg, event->resourceid);
	fputs("\n", fp);
    }
    XGetErrorDatabaseText(dpy, mtype, "ErrorSerial", "Error Serial #%d",
			  mesg, BUFSIZ);
    fputs("  ", fp);
    (void) fprintf(fp, mesg, event->serial);
    /*    XGetErrorDatabaseText(dpy, mtype, "CurrentSerial", "Current Serial #%d",
			  mesg, BUFSIZ);
    fputs("\n  ", fp);
    (void) fprintf(fp, mesg, dpy->request); */
    fputs("\n", fp);
    if (event->error_code == BadImplementation) return 0;
    return 1;
}

int nxagentExitHandler(const char *message)
{
  FatalError("%s", message);

  return 0;
}

void nxagentOpenClientsLogFile(void)
{
  if (*nxagentClientsLogName == '\0')
  {
    nxagentGetClientsPath();
  }

  if (nxagentClientsLogName != NULL && *nxagentClientsLogName != '\0')
  {
    nxagentClientsLog = open(nxagentClientsLogName, O_RDWR | O_CREAT | O_APPEND, 0600);

    if (nxagentClientsLog == -1)
    {
      fprintf(stderr, "Warning: Failed to open clients log. Error is %d '%s'.\n",
                  errno, strerror(errno));
    }
  }
  else
  {
    #ifdef TEST
    fprintf(stderr, "nxagentOpenClientsLogFile: Cannot open clients log file. The path does not exist.\n");
    #endif
  }
}

void nxagentCloseClientsLogFile(void)
{
  close(nxagentClientsLog);
}

void nxagentStartRedirectToClientsLog(void)
{
  nxagentOpenClientsLogFile();

  if (nxagentClientsLog != -1)
  {
    if (nxagentStderrBackup == -1)
    {
      nxagentStderrBackup = dup(STDERR_FILENO);
    }

    if (nxagentStderrBackup != -1)
    {
      nxagentStderrDup = dup2(nxagentClientsLog, STDERR_FILENO);

      if (nxagentStderrDup == -1)
      {
        fprintf(stderr, "Warning: Failed to redirect stderr. Error is %d '%s'.\n",
                    errno, strerror(errno));
      }
    }
    else
    {
      fprintf(stderr, "Warning: Failed to backup stderr. Error is %d '%s'.\n",
                  errno, strerror(errno));
    }
  }
}

void nxagentEndRedirectToClientsLog(void)
{
  if (nxagentStderrBackup != -1)
  {
    nxagentStderrDup = dup2(nxagentStderrBackup, STDERR_FILENO);

    if (nxagentStderrDup == -1)
    {
      fprintf(stderr, "Warning: Failed to restore stderr. Error is %d '%s'.\n",
                  errno, strerror(errno));
    }
  }

  nxagentCloseClientsLogFile();
}

char *nxagentGetHomePath(void)
{
  char *homeEnv;
  char *homePath;

  if (*nxagentHomeDir == '\0')
  {
    /*
     * Check the NX_HOME environment.
     */

    homeEnv = getenv("NX_HOME");

    if (homeEnv == NULL || *homeEnv == '\0')
    {
      #ifdef TEST
      fprintf(stderr, "nxagentGetHomePath: No environment for NX_HOME.\n");
      #endif

      homeEnv = getenv("HOME");

      if (homeEnv == NULL || *homeEnv == '\0')
      {
        #ifdef PANIC
        fprintf(stderr, "nxagentGetHomePath: PANIC! No environment for HOME.\n");
        #endif

        return NULL;
      }
    }

    if (strlen(homeEnv) > DEFAULT_STRING_LENGTH - 1)
    {
      #ifdef PANIC
      fprintf(stderr, "nxagentGetHomePath: PANIC! Invalid value for the NX "
                  "home directory '%s'.\n", homeEnv);
      #endif
    }

    snprintf(nxagentHomeDir, DEFAULT_STRING_LENGTH, "%s", homeEnv);

    #ifdef TEST
    fprintf(stderr, "nxagentGetHomePath: Assuming NX user's home directory '%s'.\n", nxagentHomeDir);
    #endif
  }

  homePath = strdup(nxagentHomeDir);

  if (homePath == NULL)
  {
    #ifdef PANIC
    fprintf(stderr, "nxagentGetHomePath: PANIC! Can't allocate memory for the home path.\n");
    #endif

    return NULL;
  }

  return homePath;
}

char *nxagentGetRootPath(void)
{
  char *rootEnv;
  char *homeEnv;
  char *rootPath;

  struct stat dirStat;

  if (*nxagentRootDir == '\0')
  {
    /*
     * Check the NX_ROOT environment.
     */

    rootEnv = getenv("NX_ROOT");

    if (rootEnv == NULL || *rootEnv == '\0')
    {
      #ifdef TEST
      fprintf(stderr, "nxagentGetRootPath: WARNING! No environment for NX_ROOT.\n");
      #endif

      /*
       * We will determine the root NX directory
       * based on the NX_HOME or HOME directory
       * settings.
       */

      homeEnv = nxagentGetHomePath();

      if (homeEnv == NULL)
      {
        return NULL;
      }

      if (strlen(homeEnv) > DEFAULT_STRING_LENGTH -
              strlen("/.nx") - 1)
      {
        #ifdef PANIC
        fprintf(stderr, "nxagentGetRootPath: PANIC! Invalid value for the NX "
                    "home directory '%s'.\n", homeEnv);
        #endif

        SAFE_free(homeEnv);

        return NULL;
      }

      #ifdef TEST
      fprintf(stderr, "nxagentGetRootPath: Assuming NX root directory in '%s'.\n", homeEnv);
      #endif

      snprintf(nxagentRootDir, DEFAULT_STRING_LENGTH, "%s/.nx", homeEnv);

      SAFE_free(homeEnv);

      /*
       * Create the NX root directory.
       */

      if ((stat(nxagentRootDir, &dirStat) == -1) && (errno == ENOENT))
      {
        if (mkdir(nxagentRootDir, 0777) < 0 && (errno != EEXIST))
        {
          #ifdef PANIC
          fprintf(stderr, "nxagentGetRootPath: PANIC! Can't create directory '%s'. Error is %d '%s'.\n",
                      nxagentRootDir, errno, strerror(errno));
          #endif

          return NULL;
        }
      }
    }
    else
    {
      if (strlen(rootEnv) > DEFAULT_STRING_LENGTH - 1)
      {
        #ifdef PANIC
         fprintf(stderr, "nxagentGetRootPath: PANIC! Invalid value for the NX root directory '%s'.\n",
                     rootEnv);
        #endif

        return NULL;
      }

      snprintf(nxagentRootDir, DEFAULT_STRING_LENGTH, "%s", rootEnv);
    }

    #ifdef TEST
    fprintf(stderr, "nxagentGetRootPath: Assuming NX root directory '%s'.\n",
                nxagentRootDir);
    #endif

  }

  rootPath = strdup(nxagentRootDir);

  if (rootPath == NULL)
  {
    #ifdef PANIC
    fprintf(stderr, "nxagentGetRootPath: Can't allocate memory for the root path.\n");
    #endif

    return NULL;
  }

  return rootPath;
}

char *nxagentGetSessionPath(void)
{

  char *rootPath;
  char *sessionPath;

  struct stat dirStat;

  if (*nxagentSessionDir == '\0')
  {
    /*
     * If nxagentSessionId does not exist we
     * assume that the sessionPath cannot be
     * realized and do not use the clients
     * log file.
     */

    if (*nxagentSessionId == '\0')
    {
      #ifdef TEST
      fprintf(stderr, "nxagentGetSessionPath: Session id does not exist. Assuming session path NULL.\n");
      #endif

      return NULL;
    }

    rootPath = nxagentGetRootPath();

    if (rootPath == NULL)
    {
      return NULL;
    }

    /* FIXME: necessary? */
    snprintf(nxagentSessionDir, DEFAULT_STRING_LENGTH, "%s", rootPath);

    if (strlen(nxagentSessionDir) + strlen("/C-") + strlen(nxagentSessionId) > DEFAULT_STRING_LENGTH - 1)
    {
      #ifdef PANIC
      fprintf(stderr, "nxagentGetSessionPath: PANIC!: Invalid value for the NX session directory '%s'.\n",
                  nxagentSessionDir);
      #endif

      SAFE_free(rootPath);

      return NULL;
    }

    snprintf(nxagentSessionDir, DEFAULT_STRING_LENGTH, "%s/C-%s", rootPath, nxagentSessionId);

    SAFE_free(rootPath);

    if ((stat(nxagentSessionDir, &dirStat) == -1) && (errno == ENOENT))
    {
      if (mkdir(nxagentSessionDir, 0777) < 0 && (errno != EEXIST))
      {
        #ifdef PANIC
        fprintf(stderr, "nxagentGetSessionPath: PANIC! Can't create directory '%s'. Error is %d '%s'.\n",
                    nxagentSessionDir, errno, strerror(errno));
        #endif

        return NULL;
      }
    }

    #ifdef TEST
    fprintf(stderr, "nxagentGetSessionPath: NX session is '%s'.\n",
                nxagentSessionDir);
    #endif

  }

  sessionPath = strdup(nxagentSessionDir);

  if (sessionPath == NULL)
  {
    #ifdef PANIC
    fprintf(stderr, "nxagentGetSessionPath:: PANIC! Can't allocate memory for the session path.\n");
    #endif

    return NULL;
  }

  return sessionPath;
}

void nxagentGetClientsPath(void)
{

  if (*nxagentClientsLogName == '\0')
  {
    char *sessionPath = nxagentGetSessionPath();

    if (sessionPath == NULL)
    {
      return;
    }

    if (strlen(sessionPath) + strlen("/clients") > NXAGENTCLIENTSLOGNAMELENGTH - 1)
    {
      #ifdef PANIC
      fprintf(stderr, "nxagentGetClientsPath: PANIC! Invalid value for the NX clients Log File Path ''.\n");
      #endif

      SAFE_free(sessionPath);

      return;
    }

    snprintf(nxagentClientsLogName, NXAGENTCLIENTSLOGNAMELENGTH, "%s/clients", sessionPath);

    SAFE_free(sessionPath);
  }

  return;
}