summaryrefslogtreecommitdiffstats
path: root/contrib/cvs/src/root.c
blob: d88c6f4b55a6f323b34b5be5198d6df11c62321e (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
/*
 * Copyright (c) 1992, Mark D. Baushke
 *
 * You may distribute under the terms of the GNU General Public License as
 * specified in the README file that comes with the CVS source distribution.
 * 
 * Name of Root
 * 
 * Determine the path to the CVSROOT and set "Root" accordingly.
 */

#include "cvs.h"
#include "getline.h"

/* Printable names for things in the CVSroot_method enum variable.
   Watch out if the enum is changed in cvs.h! */

char *method_names[] = {
    "local", "server (rsh)", "pserver", "kserver", "gserver", "ext", "fork"
};

#ifndef DEBUG

char *
Name_Root (dir, update_dir)
    char *dir;
    char *update_dir;
{
    FILE *fpin;
    char *ret, *xupdate_dir;
    char *root = NULL;
    size_t root_allocated = 0;
    char *tmp;
    char *cvsadm;
    char *cp;

    if (update_dir && *update_dir)
	xupdate_dir = update_dir;
    else
	xupdate_dir = ".";

    if (dir != NULL)
    {
	cvsadm = xmalloc (strlen (dir) + sizeof (CVSADM) + 10);
	(void) sprintf (cvsadm, "%s/%s", dir, CVSADM);
	tmp = xmalloc (strlen (dir) + sizeof (CVSADM_ROOT) + 10);
	(void) sprintf (tmp, "%s/%s", dir, CVSADM_ROOT);
    }
    else
    {
	cvsadm = xstrdup (CVSADM);
	tmp = xstrdup (CVSADM_ROOT);
    }

    /*
     * Do not bother looking for a readable file if there is no cvsadm
     * directory present.
     *
     * It is possible that not all repositories will have a CVS/Root
     * file. This is ok, but the user will need to specify -d
     * /path/name or have the environment variable CVSROOT set in
     * order to continue.  */
    if ((!isdir (cvsadm)) || (!isreadable (tmp)))
    {
	ret = NULL;
	goto out;
    }

    /*
     * The assumption here is that the CVS Root is always contained in the
     * first line of the "Root" file.
     */
    fpin = open_file (tmp, "r");

    if (getline (&root, &root_allocated, fpin) < 0)
    {
	/* FIXME: should be checking for end of file separately; errno
	   is not set in that case.  */
	error (0, 0, "in directory %s:", xupdate_dir);
	error (0, errno, "cannot read %s", CVSADM_ROOT);
	error (0, 0, "please correct this problem");
	ret = NULL;
	goto out;
    }
    (void) fclose (fpin);
    if ((cp = strrchr (root, '\n')) != NULL)
	*cp = '\0';			/* strip the newline */

    /*
     * root now contains a candidate for CVSroot. It must be an
     * absolute pathname or specify a remote server.
     */

    if (
#ifdef CLIENT_SUPPORT
	(strchr (root, ':') == NULL) &&
#endif
    	! isabsolute (root))
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (0, 0,
	       "ignoring %s because it does not contain an absolute pathname.",
	       CVSADM_ROOT);
	ret = NULL;
	goto out;
    }

#ifdef CLIENT_SUPPORT
    if ((strchr (root, ':') == NULL) && !isdir (root))
#else /* ! CLIENT_SUPPORT */
    if (!isdir (root))
#endif /* CLIENT_SUPPORT */
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (0, 0,
	       "ignoring %s because it specifies a non-existent repository %s",
	       CVSADM_ROOT, root);
	ret = NULL;
	goto out;
    }

    /* allocate space to return and fill it in */
    strip_trailing_slashes (root);
    ret = xstrdup (root);
 out:
    free (cvsadm);
    free (tmp);
    if (root != NULL)
	free (root);
    return (ret);
}

/*
 * Write the CVS/Root file so that the environment variable CVSROOT
 * and/or the -d option to cvs will be validated or not necessary for
 * future work.
 */
void
Create_Root (dir, rootdir)
    char *dir;
    char *rootdir;
{
    FILE *fout;
    char *tmp;

    if (noexec)
	return;

    /* record the current cvs root */

    if (rootdir != NULL)
    {
        if (dir != NULL)
	{
	    tmp = xmalloc (strlen (dir) + sizeof (CVSADM_ROOT) + 10);
	    (void) sprintf (tmp, "%s/%s", dir, CVSADM_ROOT);
	}
        else
	    tmp = xstrdup (CVSADM_ROOT);

        fout = open_file (tmp, "w+");
        if (fprintf (fout, "%s\n", rootdir) < 0)
	    error (1, errno, "write to %s failed", tmp);
        if (fclose (fout) == EOF)
	    error (1, errno, "cannot close %s", tmp);
	free (tmp);
    }
}

#endif /* ! DEBUG */


/* The root_allow_* stuff maintains a list of legal CVSROOT
   directories.  Then we can check against them when a remote user
   hands us a CVSROOT directory.  */

static unsigned int root_allow_count;
static char **root_allow_vector;
static unsigned int root_allow_size;

void
root_allow_add (arg)
    char *arg;
{
    char *p;

    if (root_allow_size <= root_allow_count)
    {
	if (root_allow_size == 0)
	{
	    root_allow_size = 1;
	    root_allow_vector =
		(char **) malloc (root_allow_size * sizeof (char *));
	}
	else
	{
	    root_allow_size *= 2;
	    root_allow_vector =
		(char **) realloc (root_allow_vector,
				   root_allow_size * sizeof (char *));
	}

	if (root_allow_vector == NULL)
	{
	no_memory:
	    /* Strictly speaking, we're not supposed to output anything
	       now.  But we're about to exit(), give it a try.  */
	    printf ("E Fatal server error, aborting.\n\
error ENOMEM Virtual memory exhausted.\n");

	    /* I'm doing this manually rather than via error_exit ()
	       because I'm not sure whether we want to call server_cleanup.
	       Needs more investigation....  */

#ifdef SYSTEM_CLEANUP
	    /* Hook for OS-specific behavior, for example socket
	       subsystems on NT and OS2 or dealing with windows
	       and arguments on Mac.  */
	    SYSTEM_CLEANUP ();
#endif

	    exit (EXIT_FAILURE);
	}
    }
    p = malloc (strlen (arg) + 1);
    if (p == NULL)
	goto no_memory;
    strcpy (p, arg);
    root_allow_vector[root_allow_count++] = p;
}

void
root_allow_free ()
{
    if (root_allow_vector != NULL)
	free (root_allow_vector);
    root_allow_count = 0;
    root_allow_size = 0;
}

int
root_allow_ok (arg)
    char *arg;
{
    unsigned int i;

    if (root_allow_count == 0)
    {
	/* Probably someone upgraded from CVS before 1.9.10 to 1.9.10
	   or later without reading the documentation about
	   --allow-root.  Printing an error here doesn't disclose any
	   particularly useful information to an attacker because a
	   CVS server configured in this way won't let *anyone* in.  */

	/* Note that we are called from a context where we can spit
	   back "error" rather than waiting for the next request which
	   expects responses.  */
	printf ("\
error 0 Server configuration missing --allow-root in inetd.conf\n");
	error_exit ();
    }

    for (i = 0; i < root_allow_count; ++i)
	if (strcmp (root_allow_vector[i], arg) == 0)
	    return 1;
    return 0;
}

/* This global variable holds the global -d option.  It is NULL if -d
   was not used, which means that we must get the CVSroot information
   from the CVSROOT environment variable or from a CVS/Root file.  */

char *CVSroot_cmdline;

/* Parse a CVSROOT variable into its constituent parts -- method,
 * username, hostname, directory.  The prototypical CVSROOT variable
 * looks like:
 *
 * :method:user@host:path
 *
 * Some methods may omit fields; local, for example, doesn't need user
 * and host.
 *
 * Returns zero on success, non-zero on failure. */

char *CVSroot_original = NULL;	/* the CVSroot that was passed in */
int client_active;		/* nonzero if we are doing remote access */
CVSmethod CVSroot_method;	/* one of the enum values defined in cvs.h */
char *CVSroot_username;		/* the username or NULL if method == local */
char *CVSroot_hostname;		/* the hostname or NULL if method == local */
char *CVSroot_directory;	/* the directory name */

int
parse_cvsroot (CVSroot)
    char *CVSroot;
{
    static int cvsroot_parsed = 0;
    char *cvsroot_copy, *p;
    int check_hostname;

    /* Don't go through the trouble twice. */
    if (cvsroot_parsed)
    {
	error (0, 0, "WARNING (parse_cvsroot): someone called me twice!\n");
	return 0;
    }

    CVSroot_original = xstrdup (CVSroot);
    cvsroot_copy = xstrdup (CVSroot);

    if ((*cvsroot_copy == ':'))
    {
	char *method = ++cvsroot_copy;

	/* Access method specified, as in
	 * "cvs -d :pserver:user@host:/path",
	 * "cvs -d :local:e:\path",
	 * "cvs -d :kserver:user@host:/path", or
	 * "cvs -d :fork:/path".
	 * We need to get past that part of CVSroot before parsing the
	 * rest of it.
	 */

	if (! (p = strchr (method, ':')))
	{
	    error (0, 0, "bad CVSroot: %s", CVSroot);
	    return 1;
	}
	*p = '\0';
	cvsroot_copy = ++p;

	/* Now we have an access method -- see if it's valid. */

	if (strcmp (method, "local") == 0)
	    CVSroot_method = local_method;
	else if (strcmp (method, "pserver") == 0)
	    CVSroot_method = pserver_method;
	else if (strcmp (method, "kserver") == 0)
	    CVSroot_method = kserver_method;
	else if (strcmp (method, "gserver") == 0)
	    CVSroot_method = gserver_method;
	else if (strcmp (method, "server") == 0)
	    CVSroot_method = server_method;
	else if (strcmp (method, "ext") == 0)
	    CVSroot_method = ext_method;
	else if (strcmp (method, "fork") == 0)
	    CVSroot_method = fork_method;
	else
	{
	    error (0, 0, "unknown method in CVSroot: %s", CVSroot);
	    return 1;
	}
    }
    else
    {
	/* If the method isn't specified, assume
	   SERVER_METHOD/EXT_METHOD if the string contains a colon or
	   LOCAL_METHOD otherwise.  */

	CVSroot_method = ((strchr (cvsroot_copy, ':'))
#ifdef RSH_NOT_TRANSPARENT
			  ? server_method
#else
			  ? ext_method
#endif
			  : local_method);
    }

    client_active = (CVSroot_method != local_method);

    /* Check for username/hostname if we're not LOCAL_METHOD. */

    CVSroot_username = NULL;
    CVSroot_hostname = NULL;

    if ((CVSroot_method != local_method)
	&& (CVSroot_method != fork_method))
    {
	/* Check to see if there is a username in the string. */

	if ((p = strchr (cvsroot_copy, '@')))
	{
	    CVSroot_username = cvsroot_copy;
	    *p = '\0';
	    cvsroot_copy = ++p;
	    if (*CVSroot_username == '\0')
		CVSroot_username = NULL;
	}

	if ((p = strchr (cvsroot_copy, ':')))
	{
	    CVSroot_hostname = cvsroot_copy;
	    *p = '\0';
	    cvsroot_copy = ++p;
      
	    if (*CVSroot_hostname == '\0')
		CVSroot_hostname = NULL;
	}
    }

    CVSroot_directory = cvsroot_copy;

#if ! defined (CLIENT_SUPPORT) && ! defined (DEBUG)
    if (CVSroot_method != local_method)
    {
	error (0, 0, "Your CVSROOT is set for a remote access method");
	error (0, 0, "but your CVS executable doesn't support it");
	error (0, 0, "(%s)", CVSroot);
	return 1;
    }
#endif
  
    /* Do various sanity checks. */

    if (CVSroot_username && ! CVSroot_hostname)
    {
	error (0, 0, "missing hostname in CVSROOT: %s", CVSroot);
	return 1;
    }

    check_hostname = 0;
    switch (CVSroot_method)
    {
    case local_method:
    case fork_method:
	if (CVSroot_username || CVSroot_hostname)
	{
	    error (0, 0, "can't specify hostname and username in CVSROOT");
	    error (0, 0, "when using %s access method",
		   CVSroot_method == local_method ? "local" : "fork");
	    error (0, 0, "(%s)", CVSroot);
	    return 1;
	}
	/* cvs.texinfo has always told people that CVSROOT must be an
	   absolute pathname.  Furthermore, attempts to use a relative
	   pathname produced various errors (I couldn't get it to work),
	   so there would seem to be little risk in making this a fatal
	   error.  */
	if (!isabsolute (CVSroot_directory))
	    error (1, 0, "CVSROOT %s must be an absolute pathname",
		   CVSroot_directory);
	break;
    case kserver_method:
#ifndef HAVE_KERBEROS
	error (0, 0, "Your CVSROOT is set for a kerberos access method");
	error (0, 0, "but your CVS executable doesn't support it");
	error (0, 0, "(%s)", CVSroot);
	return 1;
#else
	check_hostname = 1;
	break;
#endif
    case gserver_method:
#ifndef HAVE_GSSAPI
	error (0, 0, "Your CVSROOT is set for a GSSAPI access method");
	error (0, 0, "but your CVS executable doesn't support it");
	error (0, 0, "(%s)", CVSroot);
	return 1;
#else
	check_hostname = 1;
	break;
#endif
    case server_method:
    case ext_method:
    case pserver_method:
	check_hostname = 1;
	break;
    }

    if (check_hostname)
    {
	if (! CVSroot_hostname)
	{
	    error (0, 0, "didn't specify hostname in CVSROOT: %s", CVSroot);
	    return 1;
	}
    }

    if (*CVSroot_directory == '\0')
    {
	error (0, 0, "missing directory in CVSROOT: %s", CVSroot);
	return 1;
    }
    
    /* Hooray!  We finally parsed it! */
    return 0;
}


/* Set up the global CVSroot* variables as if we're using the local
   repository DIR.  DIR must point to storage which will last for the
   rest of the CVS invocation (for example, the caller might malloc it
   and never free it, or free it just before exiting CVS).  */

void
set_local_cvsroot (dir)
    char *dir;
{
    CVSroot_original = dir;
    CVSroot_method = local_method;
    CVSroot_directory = CVSroot_original;
    CVSroot_username = NULL;
    CVSroot_hostname = NULL;
    client_active = 0;
}


#ifdef DEBUG
/* This is for testing the parsing function.  Use

     gcc -I. -I.. -I../lib -DDEBUG root.c -o root

   to compile.  */

#include <stdio.h>

char *CVSroot;
char *program_name = "testing";
char *command_name = "parse_cvsroot";		/* XXX is this used??? */

/* Toy versions of various functions when debugging under unix.  Yes,
   these make various bad assumptions, but they're pretty easy to
   debug when something goes wrong.  */

void
error_exit PROTO ((void))
{
    exit (1);
}

char *
xstrdup (str)
     const char *str;
{
    return strdup (str);
}

int
isabsolute (dir)
    const char *dir;
{
    return (dir && (*dir == '/'));
}

void
main (argc, argv)
    int argc;
    char *argv[];
{
    program_name = argv[0];

    if (argc != 2)
    {
	fprintf (stderr, "Usage: %s <CVSROOT>\n", program_name);
	exit (2);
    }
  
    if (parse_cvsroot (argv[1]))
    {
	fprintf (stderr, "%s: Parsing failed.\n", program_name);
	exit (1);
    }
    printf ("CVSroot: %s\n", argv[1]);
    printf ("CVSroot_method: %s\n", method_names[CVSroot_method]);
    printf ("CVSroot_username: %s\n",
	    CVSroot_username ? CVSroot_username : "NULL");
    printf ("CVSroot_hostname: %s\n",
	    CVSroot_hostname ? CVSroot_hostname : "NULL");
    printf ("CVSroot_directory: %s\n", CVSroot_directory);

   exit (0);
   /* NOTREACHED */
}
#endif
OpenPOWER on IntegriCloud