summaryrefslogtreecommitdiff
path: root/ftpfs/netfs.c
blob: 02cea7006b4a427eb16d172d66fae20996445e5c (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
/* ftpfs interface to libnetfs

   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   Written by Miles Bader <miles@gnu.ai.mit.edu>
   This file is part of the GNU Hurd.

   The GNU Hurd 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.

   The GNU Hurd 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, USA. */

#include <stddef.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <fcntl.h>

#include <hurd/netfs.h>

#include "ftpfs.h"
#include "ccache.h"

/* Attempt to create a file named NAME in DIR for USER with MODE.  Set *NODE
   to the new node upon return.  On any error, clear *NODE.  *NODE should be
   locked on success; no matter what, unlock DIR before returning.  */
error_t
netfs_attempt_create_file (struct iouser *user, struct node *dir,
			   char *name, mode_t mode, struct node **node)
{
  *node = 0;
  mutex_unlock (&dir->lock);
  return EOPNOTSUPP;
}

/* Node NODE is being opened by USER, with FLAGS.  NEWNODE is nonzero if we
   just created this node.  Return an error if we should not permit the open
   to complete because of a permission restriction. */
error_t
netfs_check_open_permissions (struct iouser *user, struct node *node,
			      int flags, int newnode)
{
  error_t err = ftpfs_refresh_node (node);
  if (!err && (flags & O_READ))
    err = fshelp_access (&node->nn_stat, S_IREAD, user);
  if (!err && (flags & O_WRITE))
    err = fshelp_access (&node->nn_stat, S_IWRITE, user);
  if (!err && (flags & O_EXEC))
    err = fshelp_access (&node->nn_stat, S_IEXEC, user);
  return err;
}

/* This should attempt a utimes call for the user specified by CRED on node
   NODE, to change the atime to ATIME and the mtime to MTIME. */
error_t
netfs_attempt_utimes (struct iouser *cred, struct node *node,
		      struct timespec *atime, struct timespec *mtime)
{
  error_t err = ftpfs_refresh_node (node);

  if (! err)
    err = fshelp_isowner (&node->nn_stat, cred);

  if (! err)
    {
      node->nn_stat.st_mtime = mtime->tv_sec;
      node->nn_stat.st_mtime_usec = mtime->tv_nsec / 1000;
      node->nn_stat.st_atime = atime->tv_sec;
      node->nn_stat.st_atime_usec = atime->tv_nsec / 1000;
      fshelp_touch (&node->nn_stat, TOUCH_CTIME, ftpfs_maptime);
    }

  return err;
}

/* Return the valid access types (bitwise OR of O_READ, O_WRITE, and O_EXEC)
   in *TYPES for file NODE and user CRED.  */
error_t
netfs_report_access (struct iouser *cred, struct node *node, int *types)
{
  error_t err = ftpfs_refresh_node (node);

  if (! err)
    {
      *types = 0;
      if (fshelp_access (&node->nn_stat, S_IREAD, cred) == 0)
	*types |= O_READ;
      if (fshelp_access (&node->nn_stat, S_IWRITE, cred) == 0)
	*types |= O_WRITE;
      if (fshelp_access (&node->nn_stat, S_IEXEC, cred) == 0)
	*types |= O_EXEC;
    }

  return err;
}

/* Trivial definitions.  */

/* Make sure that NP->nn_stat is filled with current information.  CRED
   identifies the user responsible for the operation.  */
error_t
netfs_validate_stat (struct node *node, struct iouser *cred)
{
  return ftpfs_refresh_node (node);
}

/* This should sync the file NODE completely to disk, for the user CRED.  If
   WAIT is set, return only after sync is completely finished.  */
error_t
netfs_attempt_sync (struct iouser *cred, struct node *node, int wait)
{
  return 0;
}

/* The granularity with which we allocate space to return our result.  */
#define DIRENTS_CHUNK_SIZE	(8*1024)

/* Returned directory entries are aligned to blocks this many bytes long.
   Must be a power of two.  */
#define DIRENT_ALIGN 4
#define DIRENT_NAME_OFFS offsetof (struct dirent, d_name)

/* Length is structure before the name + the name + '\0', all
   padded to a four-byte alignment.  */
#define DIRENT_LEN(name_len)						      \
  ((DIRENT_NAME_OFFS + (name_len) + 1 + (DIRENT_ALIGN - 1))		      \
   & ~(DIRENT_ALIGN - 1))

/* Fetch a directory, as for netfs_get_dirents.  */
static error_t
get_dirents (struct ftpfs_dir *dir,
	     int first_entry, int max_entries, char **data,
	     mach_msg_type_number_t *data_len,
	     vm_size_t max_data_len, int *data_entries)
{
  struct ftpfs_dir_entry *e;
  error_t err = 0;

  if (! dir)
    return ENOTDIR;

  e = dir->ordered;

  /* Find the first entry.  */
  while (first_entry-- > 0)
    if (! e)
      {
	max_entries = 0;
	break;
      }
    else
      e = e->ordered_next;

  if (max_entries != 0)
    {
      size_t size =
	(max_data_len == 0 || max_data_len > DIRENTS_CHUNK_SIZE
	 ? DIRENTS_CHUNK_SIZE
	 : max_data_len);

      err = vm_allocate (mach_task_self (), (vm_address_t *) data, size, 1);

      if (! err)
	{
	  char *p = *data;
	  int count = 0;

	  /* See how much space we need for the result.  */
	  while ((max_entries == -1 || count < max_entries) && e)
	    {
	      struct dirent hdr;
	      size_t name_len = strlen (e->name);
	      size_t sz = DIRENT_LEN (name_len);
	      int entry_type =
		e->stat_timestamp ? IFTODT (e->stat.st_mode) : DT_UNKNOWN;

	      if ((p - *data) + sz > size)
		{
		  if (max_data_len > 0)
		    break;
		  else
		    /* Try to grow our return buffer.  */
		    {
		      vm_address_t extension = (vm_address_t)(*data + size);
		      err = vm_allocate (mach_task_self (), &extension,
					 DIRENTS_CHUNK_SIZE, 0);
		      if (err)
			break;
		      size += DIRENTS_CHUNK_SIZE;
		    }
		}

	      hdr.d_namlen = name_len;
	      hdr.d_fileno = e->stat.st_ino;
	      hdr.d_reclen = sz;
	      hdr.d_type = entry_type;

	      memcpy (p, &hdr, DIRENT_NAME_OFFS);
	      strcpy (p + DIRENT_NAME_OFFS, e->name);
	      p += sz;

	      count++;
	      e = e->ordered_next;
	    }

	  if (err)
	    vm_deallocate (mach_task_self (), (vm_address_t)*data, size);
	  else
	    {
	      vm_address_t alloc_end = (vm_address_t)(*data + size);
	      vm_address_t real_end = round_page (p);
	      if (alloc_end > real_end)
		vm_deallocate (mach_task_self (),
			       real_end, alloc_end - real_end);
	      *data_len = p - *data;
	      *data_entries = count;
	    }
	}
    }
  else
    {
      *data_len = 0;
      *data_entries = 0;
    }

  return err;
}

error_t
netfs_get_dirents (struct iouser *cred, struct node *dir,
		   int first_entry, int max_entries, char **data,
		   mach_msg_type_number_t *data_len,
		   vm_size_t max_data_len, int *data_entries)
{
  error_t err = ftpfs_refresh_node (dir);

  if (! err)
    {
      if (dir->nn->dir)
	{
	  err = ftpfs_dir_refresh (dir->nn->dir);
	  if (! err)
	    err = get_dirents (dir->nn->dir, first_entry, max_entries,
			       data, data_len, max_entries, data_entries);
	}
      else
	err = ENOTDIR;
    }

  return err;
}

/* Lookup NAME in DIR for USER; set *NODE to the found name upon return.  If
   the name was not found, then return ENOENT.  On any error, clear *NODE.
   (*NODE, if found, should be locked, this call should unlock DIR no matter
   what.) */
error_t netfs_attempt_lookup (struct iouser *user, struct node *dir,
			      char *name, struct node **node)
{
  error_t err = ftpfs_refresh_node (dir);
  if (! err)
    err = ftpfs_dir_lookup (dir->nn->dir, name, node);
  return err;
}

/* Delete NAME in DIR for USER. */
error_t netfs_attempt_unlink (struct iouser *user, struct node *dir,
			      char *name)
{
  return EROFS;
}

/* Note that in this one call, neither of the specific nodes are locked. */
error_t netfs_attempt_rename (struct iouser *user, struct node *fromdir,
			      char *fromname, struct node *todir,
			      char *toname, int excl)
{
  return EROFS;
}

/* Attempt to create a new directory named NAME in DIR for USER with mode
   MODE.  */
error_t netfs_attempt_mkdir (struct iouser *user, struct node *dir,
			     char *name, mode_t mode)
{
  return EROFS;
}

/* Attempt to remove directory named NAME in DIR for USER. */
error_t netfs_attempt_rmdir (struct iouser *user,
			     struct node *dir, char *name)
{
  return EROFS;
}

/* This should attempt a chmod call for the user specified by CRED on node
   NODE, to change the owner to UID and the group to GID. */
error_t netfs_attempt_chown (struct iouser *cred, struct node *node,
			     uid_t uid, uid_t gid)
{
  return EROFS;
}

/* This should attempt a chauthor call for the user specified by CRED on node
   NODE, to change the author to AUTHOR. */
error_t netfs_attempt_chauthor (struct iouser *cred, struct node *node,
				uid_t author)
{
  return EROFS;
}

/* This should attempt a chmod call for the user specified by CRED on node
   NODE, to change the mode to MODE.  Unlike the normal Unix and Hurd meaning
   of chmod, this function is also used to attempt to change files into other
   types.  If such a transition is attempted which is impossible, then return
   EOPNOTSUPP.  */
error_t netfs_attempt_chmod (struct iouser *cred, struct node *node,
			     mode_t mode)
{
  return EROFS;
}

/* Attempt to turn NODE (user CRED) into a symlink with target NAME. */
error_t netfs_attempt_mksymlink (struct iouser *cred, struct node *node,
				 char *name)
{
  return EROFS;
}

/* Attempt to turn NODE (user CRED) into a device.  TYPE is either S_IFBLK or
   S_IFCHR. */
error_t netfs_attempt_mkdev (struct iouser *cred, struct node *node,
			     mode_t type, dev_t indexes)
{
  return EROFS;
}

/* Attempt to set the passive translator record for FILE to ARGZ (of length
   ARGZLEN) for user CRED. */
error_t netfs_set_translator (struct iouser *cred, struct node *node,
			      char *argz, size_t argzlen)
{
  return EROFS;
}

/* This should attempt a chflags call for the user specified by CRED on node
   NODE, to change the flags to FLAGS. */
error_t netfs_attempt_chflags (struct iouser *cred, struct node *node,
			       int flags)
{
  return EROFS;
}

/* This should attempt to set the size of the file NODE (for user CRED) to
   SIZE bytes long. */
error_t netfs_attempt_set_size (struct iouser *cred, struct node *node,
				off_t size)
{
  return EROFS;
}

/* This should attempt to fetch filesystem status information for the remote
   filesystem, for the user CRED. */
error_t netfs_attempt_statfs (struct iouser *cred, struct node *node,
			      struct statfs *st)
{
  return EOPNOTSUPP;
}

/* This should sync the entire remote filesystem.  If WAIT is set, return
   only after sync is completely finished.  */
error_t netfs_attempt_syncfs (struct iouser *cred, int wait)
{
  return 0;
}

/* Create a link in DIR with name NAME to FILE for USER.  Note that neither
   DIR nor FILE are locked.  If EXCL is set, do not delete the target, but
   return EEXIST if NAME is already found in DIR.  */
error_t netfs_attempt_link (struct iouser *user, struct node *dir,
			    struct node *file, char *name, int excl)
{
  return EROFS;
}

/* Attempt to create an anonymous file related to DIR for USER with MODE.
   Set *NODE to the returned file upon success.  No matter what, unlock DIR. */
error_t netfs_attempt_mkfile (struct iouser *user, struct node *dir,
			      mode_t mode, struct node **node)
{
  *node = 0;
  mutex_unlock (&dir->lock);
  return EROFS;
}

/* Read the contents of NODE (a symlink), for USER, into BUF. */
error_t netfs_attempt_readlink (struct iouser *user, struct node *node, char *buf)
{
  error_t err = ftpfs_refresh_node (node);
  if (! err)
    {
      struct ftpfs_dir_entry *e = node->nn->dir_entry;
      if (e)
	bcopy (e->symlink_target, buf, node->nn_stat.st_size);
      else
	err = EINVAL;
    }
  return err;
}

/* Read from the file NODE for user CRED starting at OFFSET and continuing for
   up to *LEN bytes.  Put the data at DATA.  Set *LEN to the amount
   successfully read upon return.  */
error_t netfs_attempt_read (struct iouser *cred, struct node *node,
			    off_t offset, size_t *len, void *data)
{
  error_t err = 0;

  if (! node->nn->contents)
    err = ccache_create (node, &node->nn->contents);
  if (! err)
    {
      if (*len > node->nn_stat.st_size - offset)
	*len = node->nn_stat.st_size - offset;
      if (*len > 0)
	err = ccache_read (node->nn->contents, offset, *len, data);
    }

  return err;
}

/* Write to the file NODE for user CRED starting at OFSET and continuing for up
   to *LEN bytes from DATA.  Set *LEN to the amount seccessfully written upon
   return. */
error_t netfs_attempt_write (struct iouser *cred, struct node *node,
			     off_t offset, size_t *len, void *data)
{
  return EROFS;
}