aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/lib/xtrans/Xtransutil.c
blob: 53fd7d75b22bf5d9f37d124c1c483955dc1a4fc2 (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
/*

Copyright 1993, 1994, 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 1993, 1994 NCR Corporation - Dayton, Ohio, USA
 *
 * 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 NCR not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  NCR makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * NCRS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL NCR 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.
 */

/*
 * These are some utility functions created for convenience or to provide
 * an interface that is similar to an existing interface. These are built
 * only using the Transport Independant API, and have no knowledge of
 * the internal implementation.
 */

#ifdef XTHREADS
#include <nx-X11/Xthreads.h>
#endif

#ifdef X11_t

/*
 * These values come from X.h and Xauth.h, and MUST match them. Some
 * of these values are also defined by the ChangeHost protocol message.
 */

#define FamilyInternet		0	/* IPv4 */
#define FamilyDECnet		1
#define FamilyChaos		2
#define FamilyInternet6		6
#define FamilyAmoeba		33
#define FamilyLocalHost		252
#define FamilyKrb5Principal	253
#define FamilyNetname		254
#define FamilyLocal		256
#define FamilyWild		65535

/*
 * TRANS(ConvertAddress) converts a sockaddr based address to an
 * X authorization based address. Some of this is defined as part of
 * the ChangeHost protocol. The rest is just done in a consistent manner.
 */

int
TRANS(ConvertAddress)(int *familyp, int *addrlenp, Xtransaddr **addrp)

{

    prmsg(2,"ConvertAddress(%d,%d,%p)\n",*familyp,*addrlenp,*addrp);

    switch( *familyp )
    {
#if defined(TCPCONN)
    case AF_INET:
    {
	/*
	 * Check for the BSD hack localhost address 127.0.0.1.
	 * In this case, we are really FamilyLocal.
	 */

	struct sockaddr_in saddr;
	int len = sizeof(saddr.sin_addr.s_addr);
	char *cp = (char *) &saddr.sin_addr.s_addr;

	memcpy (&saddr, *addrp, sizeof (struct sockaddr_in));

	if ((len == 4) && (cp[0] == 127) && (cp[1] == 0) &&
	    (cp[2] == 0) && (cp[3] == 1))
	{
	    *familyp=FamilyLocal;
	}
	else
	{
	    *familyp=FamilyInternet;
	    *addrlenp=len;
	    memcpy(*addrp,&saddr.sin_addr,len);
	}
	break;
    }

#if defined(IPv6) && defined(AF_INET6)
    case AF_INET6:
    {
	struct sockaddr_in6 saddr6;

	memcpy (&saddr6, *addrp, sizeof (struct sockaddr_in6));

	if (IN6_IS_ADDR_LOOPBACK(&saddr6.sin6_addr))
	{
	    *familyp=FamilyLocal;
	}
	else if (IN6_IS_ADDR_V4MAPPED(&(saddr6.sin6_addr))) {
	    char *cp = (char *) &saddr6.sin6_addr.s6_addr[12];

	    if ((cp[0] == 127) && (cp[1] == 0) &&
	      (cp[2] == 0) && (cp[3] == 1))
	    {
		*familyp=FamilyLocal;
	    }
	    else
	    {
		*familyp=FamilyInternet;
		*addrlenp = sizeof (struct in_addr);
		memcpy(*addrp,cp,*addrlenp);
	    }
	}
	else
	{
	    *familyp=FamilyInternet6;
	    *addrlenp=sizeof(saddr6.sin6_addr);
	    memcpy(*addrp,&saddr6.sin6_addr,sizeof(saddr6.sin6_addr));
	}
	break;
    }
#endif /* IPv6 */
#endif /* defined(TCPCONN) */


#if defined(UNIXCONN) || defined(LOCALCONN)
    case AF_UNIX:
    {
	*familyp=FamilyLocal;
	break;
    }
#endif /* defined(UNIXCONN) || defined(LOCALCONN) */

#if (defined(__SCO__) || defined(__UNIXWARE__)) && defined(LOCALCONN)
    case 0:
    {
	*familyp=FamilyLocal;
	break;
    }
#endif

    default:
	prmsg(1,"ConvertAddress: Unknown family type %d\n",
	      *familyp);
	return -1;
    }


    if (*familyp == FamilyLocal)
    {
	/*
	 * In the case of a local connection, we need to get the
	 * host name for authentication.
	 */

	char hostnamebuf[256];
	int len = TRANS(GetHostname) (hostnamebuf, sizeof hostnamebuf);

	if (len > 0) {
	    if (*addrp && *addrlenp < (len + 1))
	    {
		free ((char *) *addrp);
		*addrp = NULL;
	    }
	    if (!*addrp)
		*addrp = (Xtransaddr *) malloc (len + 1);
	    if (*addrp) {
		strcpy ((char *) *addrp, hostnamebuf);
		*addrlenp = len;
	    } else {
		*addrlenp = 0;
	    }
	}
	else
	{
	    if (*addrp)
		free ((char *) *addrp);
	    *addrp = NULL;
	    *addrlenp = 0;
	}
    }

    return 0;
}

#endif /* X11_t */

#ifdef ICE_t

#include <signal.h>

char *
TRANS(GetMyNetworkId) (XtransConnInfo ciptr)

{
    int		family = ciptr->family;
    char 	*addr = ciptr->addr;
    char	hostnamebuf[256];
    char 	*networkId = NULL;
    char	*transName = ciptr->transptr->TransName;

    if (gethostname (hostnamebuf, sizeof (hostnamebuf)) < 0)
    {
	return (NULL);
    }

    switch (family)
    {
#if defined(UNIXCONN) || defined(LOCALCONN)
    case AF_UNIX:
    {
	struct sockaddr_un *saddr = (struct sockaddr_un *) addr;
	networkId = (char *) malloc (3 + strlen (transName) +
	    strlen (hostnamebuf) + strlen (saddr->sun_path));
	sprintf (networkId, "%s/%s:%s", transName,
	    hostnamebuf, saddr->sun_path);
	break;
    }
#endif /* defined(UNIXCONN) || defined(LOCALCONN) */

#if defined(TCPCONN)
    case AF_INET:
#if defined(IPv6) && defined(AF_INET6)
    case AF_INET6:
#endif
    {
	struct sockaddr_in *saddr = (struct sockaddr_in *) addr;
#if defined(IPv6) && defined(AF_INET6)
	struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) addr;
#endif
	int portnum;
	char portnumbuf[10];


#if defined(IPv6) && defined(AF_INET6)
	if (family == AF_INET6)
	    portnum = ntohs (saddr6->sin6_port);
	else
#endif
	    portnum = ntohs (saddr->sin_port);

	sprintf (portnumbuf, "%d", portnum);
	networkId = (char *) malloc (3 + strlen (transName) +
	    strlen (hostnamebuf) + strlen (portnumbuf));
	sprintf (networkId, "%s/%s:%s", transName, hostnamebuf, portnumbuf);
	break;
    }
#endif /* defined(TCPCONN) */


    default:
	break;
    }

    return (networkId);
}

#include <setjmp.h>
static jmp_buf env;

#ifdef SIGALRM
static volatile int nameserver_timedout = 0;

static
#ifdef RETSIGTYPE /* set by autoconf AC_TYPE_SIGNAL */
RETSIGTYPE
#else /* Imake */
#ifdef SIGNALRETURNSINT
int
#else
void
#endif
#endif
nameserver_lost(int sig)
{
  nameserver_timedout = 1;
  longjmp (env, -1);
  /* NOTREACHED */
#ifdef SIGNALRETURNSINT
  return -1;				/* for picky compilers */
#endif
}
#endif /* SIGALARM */


char *
TRANS(GetPeerNetworkId) (XtransConnInfo ciptr)

{
    int		family = ciptr->family;
    char	*peer_addr = ciptr->peeraddr;
    char	*hostname;
    char	addrbuf[256];
    const char	*addr = NULL;

    switch (family)
    {
    case AF_UNSPEC:
#if defined(UNIXCONN) || defined(LOCALCONN)
    case AF_UNIX:
    {
	if (gethostname (addrbuf, sizeof (addrbuf)) == 0)
	    addr = addrbuf;
	break;
    }
#endif /* defined(UNIXCONN) || defined(LOCALCONN) */

#if defined(TCPCONN)
    case AF_INET:
#if defined(IPv6) && defined(AF_INET6)
    case AF_INET6:
#endif
    {
	struct sockaddr_in *saddr = (struct sockaddr_in *) peer_addr;
#if defined(IPv6) && defined(AF_INET6)
	struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) peer_addr;
#endif
	char *address;
	int addresslen;
#ifdef XTHREADS_NEEDS_BYNAMEPARAMS
	_Xgethostbynameparams hparams;
#endif
	struct hostent * volatile hostp = NULL;

#if defined(IPv6) && defined(AF_INET6)
	if (family == AF_INET6)
	{
	    address = (char *) &saddr6->sin6_addr;
	    addresslen = sizeof (saddr6->sin6_addr);
	}
	else
#endif
	{
	    address = (char *) &saddr->sin_addr;
	    addresslen = sizeof (saddr->sin_addr);
	}

#ifdef SIGALRM
	/*
	 * gethostbyaddr can take a LONG time if the host does not exist.
	 * Assume that if it does not respond in NAMESERVER_TIMEOUT seconds
	 * that something is wrong and do not make the user wait.
	 * gethostbyaddr will continue after a signal, so we have to
	 * jump out of it.
	 */

	nameserver_timedout = 0;
	signal (SIGALRM, nameserver_lost);
	alarm (4);
	if (setjmp(env) == 0) {
#endif
	    hostp = _XGethostbyaddr (address, addresslen, family, hparams);
#ifdef SIGALRM
	}
	alarm (0);
#endif
	if (hostp != NULL)
	  addr = hostp->h_name;
	else
#if defined(IPv6) && defined(AF_INET6)
	  addr = inet_ntop (family, address, addrbuf, sizeof (addrbuf));
#else
	  addr = inet_ntoa (saddr->sin_addr);
#endif
	break;
    }

#endif /* defined(TCPCONN) */


    default:
	return (NULL);
    }


    hostname = (char *) malloc (
	strlen (ciptr->transptr->TransName) + strlen (addr) + 2);
    strcpy (hostname, ciptr->transptr->TransName);
    strcat (hostname, "/");
    if (addr)
	strcat (hostname, addr);

    return (hostname);
}

#endif /* ICE_t */


#if defined(WIN32) && defined(TCPCONN)
int
TRANS(WSAStartup) (void)
{
    static WSADATA wsadata;

    prmsg (2,"WSAStartup()\n");

    if (!wsadata.wVersion && WSAStartup(0x0101, &wsadata))
        return 1;
    return 0;
}
#endif


static int
is_numeric (char *str)

{
    int i;

    for (i = 0; i < (int) strlen (str); i++)
	if (!isdigit (str[i]))
	    return (0);

    return (1);
}

#ifdef TRANS_SERVER
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

#if !defined(S_IFLNK) && !defined(S_ISLNK)
#undef lstat
#define lstat(a,b) stat(a,b)
#endif

#define FAIL_IF_NOMODE  1
#define FAIL_IF_NOT_ROOT 2
#define WARN_NO_ACCESS 4

/*
 * We make the assumption that when the 'sticky' (t) bit is requested
 * it's not save if the directory has non-root ownership or the sticky
 * bit cannot be set and fail.
 */
static int
trans_mkdir(char *path, int mode)
{
    struct stat buf;

    if (lstat(path, &buf) != 0) {
	if (errno != ENOENT) {
	    prmsg(1, "mkdir: ERROR: (l)stat failed for %s (%d)\n",
		  path, errno);
	    return -1;
	}
	/* Dir doesn't exist. Try to create it */

#ifndef WIN32
	/*
	 * 'sticky' bit requested: assume application makes
	 * certain security implications. If effective user ID
	 * is != 0: fail as we may not be able to meet them.
	 */
	if (geteuid() != 0) {
	    if (mode & 01000) {
		prmsg(1, "mkdir: ERROR: euid != 0,"
		      "directory %s will not be created.\n",
		      path);
#ifdef FAIL_HARD
		return -1;
#endif
	    } else {
		prmsg(1, "mkdir: Cannot create %s with root ownership\n",
		      path);
	    }
	}
#endif

#ifndef WIN32
	if (mkdir(path, mode) == 0) {
	    if (chmod(path, mode)) {
		prmsg(1, "mkdir: ERROR: Mode of %s should be set to %04o\n",
		      path, mode);
#ifdef FAIL_HARD
		return -1;
#endif
	    }
#else
	if (mkdir(path) == 0) {
#endif
	} else {
	    prmsg(1, "mkdir: ERROR: Cannot create %s\n",
		  path);
	    return -1;
	}

	return 0;

    } else {
	if (S_ISDIR(buf.st_mode)) {
	    int updateOwner = 0;
	    int updateMode = 0;
	    int updatedOwner = 0;
	    int updatedMode = 0;
	    int status = 0;
	    /* Check if the directory's ownership is OK. */
	    if (buf.st_uid != 0)
		updateOwner = 1;

	    /*
	     * Check if the directory's mode is OK.  An exact match isn't
	     * required, just a mode that isn't more permissive than the
	     * one requested.
	     */
	    if ((~mode) & 0077 & buf.st_mode)
		updateMode = 1;

	    /*
	     * If the directory is not writeable not everybody may
	     * be able to create sockets. Therefore warn if mode
	     * cannot be fixed.
	     */
	    if ((~buf.st_mode) & 0022 & mode) {
		updateMode = 1;
		status |= WARN_NO_ACCESS;
	    }

	    /*
	     * If 'sticky' bit is requested fail if owner isn't root
	     * as we assume the caller makes certain security implications
	     */
	    if (mode & 01000) {
		status |= FAIL_IF_NOT_ROOT;
		if (!(buf.st_mode & 01000)) {
		    status |= FAIL_IF_NOMODE;
		    updateMode = 1;
		}
	    }

#ifdef HAS_FCHOWN
	    /*
	     * If fchown(2) and fchmod(2) are available, try to correct the
	     * directory's owner and mode.  Otherwise it isn't safe to attempt
	     * to do this.
	     */
	    if (updateMode || updateOwner) {
		int fd = -1;
		struct stat fbuf;
		if ((fd = open(path, O_RDONLY)) != -1) {
		    if (fstat(fd, &fbuf) == -1) {
			prmsg(1, "mkdir: ERROR: fstat failed for %s (%d)\n",
			      path, errno);
			return -1;
		    }
		    /*
		     * Verify that we've opened the same directory as was
		     * checked above.
		     */
		    if (!S_ISDIR(fbuf.st_mode) ||
			buf.st_dev != fbuf.st_dev ||
			buf.st_ino != fbuf.st_ino) {
			prmsg(1, "mkdir: ERROR: inode for %s changed\n",
			      path);
			return -1;
		    }
		    if (updateOwner && fchown(fd, 0, 0) == 0)
			updatedOwner = 1;
		    if (updateMode && fchmod(fd, mode) == 0)
			updatedMode = 1;
		    close(fd);
		}
	    }
#endif

	    if (updateOwner && !updatedOwner) {
#ifdef FAIL_HARD
		if (status & FAIL_IF_NOT_ROOT) {
		    prmsg(1, "mkdir: ERROR: Owner of %s must be set to root\n",
			  path);
		    return -1;
		}
#endif
	  	prmsg(1, "mkdir: Owner of %s should be set to root\n",
		      path);
	    }

	    if (updateMode && !updatedMode) {
#ifdef FAIL_HARD
		if (status & FAIL_IF_NOMODE) {
		    prmsg(1, "mkdir: ERROR: Mode of %s must be set to %04o\n",
			  path, mode);
		    return -1;
		}
#endif
	  	prmsg(1, "mkdir: Mode of %s should be set to %04o\n",
		      path, mode);
		if (status & WARN_NO_ACCESS) {
		    prmsg(1, "mkdir: this may cause subsequent errors\n");
		}
	    }
	    return 0;
	}
	return -1;
    }

    /* In all other cases, fail */
    return -1;
}

#endif /* TRANS_SERVER */