summaryrefslogtreecommitdiff
path: root/src/chown.c
blob: a91e886c8d0ac80204352a2d4851d288454f8cea (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
/* chown -- change user and group ownership of files
   Copyright (C) 89, 90, 91, 1995-1999 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/*
              |     		      user
              | unchanged                 explicit
 -------------|-------------------------+-------------------------|
 g unchanged  | ---                     | chown u 		  |
 r            |-------------------------+-------------------------|
 o explicit   | chgrp g or chown .g     | chown u.g		  |
 u            |-------------------------+-------------------------|
 p from passwd| ---      	        | chown u.       	  |
              |-------------------------+-------------------------|

   Written by David MacKenzie <djm@gnu.ai.mit.edu>. */

#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <getopt.h>

#include "system.h"
#include "error.h"
#include "lchown.h"
#include "savedir.h"

/* The official name of this program (e.g., no `g' prefix).  */
#define PROGRAM_NAME "chown"

#define AUTHORS "David MacKenzie"

#ifndef _POSIX_VERSION
struct passwd *getpwnam ();
struct group *getgrnam ();
struct group *getgrgid ();
#endif

#if ! HAVE_ENDPWENT
# define endpwent() ((void) 0)
#endif

char *parse_user_spec ();
void strip_trailing_slashes ();

enum Change_status
{
  CH_NOT_APPLIED,
  CH_SUCCEEDED,
  CH_FAILED,
  CH_NO_CHANGE_REQUESTED
};

enum Verbosity
{
  /* Print a message for each file that is processed.  */
  V_high,

  /* Print a message for each file whose attributes we change.  */
  V_changes_only,

  /* Do not be verbose.  This is the default. */
  V_off
};

static int change_dir_owner PARAMS ((const char *dir, uid_t user, gid_t group,
				     struct stat *statp));

/* The name the program was run with. */
char *program_name;

/* If nonzero, and the systems has support for it, change the ownership
   of symbolic links rather than any files they point to.  */
static int change_symlinks = 1;

/* If nonzero, change the ownership of directories recursively. */
static int recurse;

/* If nonzero, force silence (no error messages). */
static int force_silent;

/* Level of verbosity.  */
static enum Verbosity verbosity = V_off;

/* The name of the user to which ownership of the files is being given. */
static char *username;

/* The name of the group to which ownership of the files is being given. */
static char *groupname;

/* The argument to the --reference option.  Use the owner and group IDs
   of this file.  This file must exist.  */
static char *reference_file;

static struct option const long_options[] =
{
  {"recursive", no_argument, 0, 'R'},
  {"changes", no_argument, 0, 'c'},
  {"dereference", no_argument, 0, CHAR_MAX + 2},
  {"no-dereference", no_argument, 0, 'h'},
  {"quiet", no_argument, 0, 'f'},
  {"silent", no_argument, 0, 'f'},
  {"reference", required_argument, 0, CHAR_MAX + 1},
  {"verbose", no_argument, 0, 'v'},
  {GETOPT_HELP_OPTION_DECL},
  {GETOPT_VERSION_OPTION_DECL},
  {0, 0, 0, 0}
};

/* Tell the user how/if the user and group of FILE have been changed.
   CHANGED describes what (if anything) has happened. */

static void
describe_change (const char *file, enum Change_status changed)
{
  const char *fmt;

  if (changed == CH_NOT_APPLIED)
    {
      printf (_("neither symbolic link %s nor referent has been changed\n"),
	      file);
      return;
    }

  switch (changed)
    {
    case CH_SUCCEEDED:
      fmt = _("owner of %s changed to ");
      break;
    case CH_FAILED:
      fmt = _("failed to change owner of %s to ");
      break;
    case CH_NO_CHANGE_REQUESTED:
      fmt = _("owner of %s retained as ");
      break;
    default:
      abort ();
    }
  printf (fmt, file);
  if (groupname)
    printf ("%s.%s\n", username, groupname);
  else
    printf ("%s\n", username);
}

/* Change the ownership of FILE to UID USER and GID GROUP.
   If it is a directory and -R is given, recurse.
   Return 0 if successful, 1 if errors occurred. */

static int
change_file_owner (int cmdline_arg, const char *file, uid_t user, gid_t group)
{
  struct stat file_stats;
  uid_t newuser;
  gid_t newgroup;
  int errors = 0;

  if (lstat (file, &file_stats))
    {
      if (force_silent == 0)
	error (0, errno, "%s", file);
      return 1;
    }

  newuser = user == (uid_t) -1 ? file_stats.st_uid : user;
  newgroup = group == (gid_t) -1 ? file_stats.st_gid : group;
  if (newuser != file_stats.st_uid || newgroup != file_stats.st_gid)
    {
      int fail;
      int symlink_changed = 1;

      if (S_ISLNK (file_stats.st_mode) && change_symlinks)
	{
	  fail = lchown (file, newuser, newgroup);

	  /* Ignore the failure if it's due to lack of support (ENOSYS)
	     and this is not a command line argument.  */
	  if (!cmdline_arg && fail && errno == ENOSYS)
	    {
	      fail = 0;
	      symlink_changed = 0;
	    }
	}
      else
	{
	  fail = chown (file, newuser, newgroup);
	}

      if (verbosity == V_high || (verbosity == V_changes_only && !fail))
	{
	  enum Change_status ch_status = (! symlink_changed ? CH_NOT_APPLIED
					  : (fail ? CH_FAILED : CH_SUCCEEDED));
	  describe_change (file, ch_status);
	}

      if (fail)
	{
	  if (force_silent == 0)
	    error (0, errno, "%s", file);
	  errors = 1;
	}
    }
  else if (verbosity == V_high)
    {
      describe_change (file, CH_NO_CHANGE_REQUESTED);
    }

  if (recurse && S_ISDIR (file_stats.st_mode))
    errors |= change_dir_owner (file, user, group, &file_stats);
  return errors;
}

/* Recursively change the ownership of the files in directory DIR
   to UID USER and GID GROUP.
   STATP points to the results of lstat on DIR.
   Return 0 if successful, 1 if errors occurred. */

static int
change_dir_owner (const char *dir, uid_t user, gid_t group, struct stat *statp)
{
  char *name_space, *namep;
  char *path;			/* Full path of each entry to process. */
  unsigned dirlength;		/* Length of `dir' and '\0'. */
  unsigned filelength;		/* Length of each pathname to process. */
  unsigned pathlength;		/* Bytes allocated for `path'. */
  int errors = 0;

  errno = 0;
  name_space = savedir (dir, (unsigned int) statp->st_size);
  if (name_space == NULL)
    {
      if (errno)
	{
	  if (force_silent == 0)
	    error (0, errno, "%s", dir);
	  return 1;
	}
      else
	error (1, 0, _("virtual memory exhausted"));
    }

  dirlength = strlen (dir) + 1;	/* + 1 is for the trailing '/'. */
  pathlength = dirlength + 1;
  /* Give `path' a dummy value; it will be reallocated before first use. */
  path = xmalloc (pathlength);
  strcpy (path, dir);
  path[dirlength - 1] = '/';

  for (namep = name_space; *namep; namep += filelength - dirlength)
    {
      filelength = dirlength + strlen (namep) + 1;
      if (filelength > pathlength)
	{
	  pathlength = filelength * 2;
	  path = xrealloc (path, pathlength);
	}
      strcpy (path + dirlength, namep);
      errors |= change_file_owner (0, path, user, group);
    }
  free (path);
  free (name_space);
  return errors;
}

void
usage (int status)
{
  if (status != 0)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s [OPTION]... OWNER[.[GROUP]] FILE...\n\
  or:  %s [OPTION]... .GROUP FILE...\n\
  or:  %s [OPTION]... --reference=RFILE FILE...\n\
"),
	      program_name, program_name, program_name);
      printf (_("\
Change the owner and/or group of each FILE to OWNER and/or GROUP.\n\
\n\
  -c, --changes          be verbose whenever change occurs\n\
      --dereference      affect the referent of each symbolic link, rather\n\
                         than the symbolic link itself\n\
  -h, --no-dereference   affect symbolic links instead of any referenced file\n\
                         (available only on systems that can change the\n\
                         ownership of a symlink)\n\
  -f, --silent, --quiet  suppress most error messages\n\
      --reference=RFILE  use the owner and group of RFILE instead of using\n\
                         explicit OWNER.GROUP values\n\
  -R, --recursive        operate on files and directories recursively\n\
  -v, --verbose          explain what is being done\n\
      --help             display this help and exit\n\
      --version          output version information and exit\n\
\n\
Owner is unchanged if missing.  Group is unchanged if missing, but changed\n\
to login group if implied by a period.  A colon may replace the period.\n\
"));
      puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
      close_stdout ();
    }
  exit (status);
}

int
main (int argc, char **argv)
{
  uid_t user = (uid_t) -1;	/* New uid; -1 if not to be changed. */
  gid_t group = (uid_t) -1;	/* New gid; -1 if not to be changed. */
  int errors = 0;
  int optc;

  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  recurse = force_silent = 0;

  while ((optc = getopt_long (argc, argv, "Rcfhv", long_options, NULL)) != -1)
    {
      switch (optc)
	{
	case 0:
	  break;
	case CHAR_MAX + 1:
	  reference_file = optarg;
	  break;
	case CHAR_MAX + 2:
	  change_symlinks = 0;
	  break;
	case 'R':
	  recurse = 1;
	  break;
	case 'c':
	  verbosity = V_changes_only;
	  break;
	case 'f':
	  force_silent = 1;
	  break;
	case 'h':
	  change_symlinks = 1;
	  break;
	case 'v':
	  verbosity = V_high;
	  break;
	case_GETOPT_HELP_CHAR;
	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
	default:
	  usage (1);
	}
    }

  if (argc - optind + (reference_file ? 1 : 0) <= 1)
    {
      error (0, 0, _("too few arguments"));
      usage (1);
    }

  if (reference_file)
    {
      struct stat ref_stats;

      if (stat (reference_file, &ref_stats))
        error (1, errno, "%s", reference_file);

      user  = ref_stats.st_uid;
      group = ref_stats.st_gid;
    }
  else
    {
      const char *e = parse_user_spec (argv[optind], &user, &group,
				       &username, &groupname);
      if (e)
        error (1, 0, "%s: %s", argv[optind], e);
      if (username == NULL)
        username = "";

      optind++;
    }

  for (; optind < argc; ++optind)
    {
      strip_trailing_slashes (argv[optind]);
      errors |= change_file_owner (1, argv[optind], user, group);
    }

  if (verbosity != V_off)
    close_stdout ();
  exit (errors);
}