usmb_file.c

   1 /* usmb - mount SMB shares via FUSE and Samba
   2  * Copyright (C) 2006-2009 Geoff Johnstone
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 3 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include "config.h"
  18 #include <sys/time.h>        // struct timeval needed by libsmbclient.h
  19 #include <libsmbclient.h>
  20 #include "samba3x-compat.h"
  21 #include <limits.h>
  22 #include <assert.h>
  23 #include <fuse.h>
  24 #include <errno.h>
  25 #include <stdbool.h>
  26 #include <stddef.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include "usmb_file.h"
  31 #include "usmb.h"
  32 #include "utils.h"
  33
  34
  35 // Samba gets st_nlink wrong for directories.
  36 static bool fix_nlink (const char *url, struct stat *st)
  37 {
  38   assert (NULL != url);
  39   assert (NULL != st);
  40
  41   if (!S_ISDIR (st->st_mode))
  42     return true;
  43
  44   SMBCFILE *file = smbc_getFunctionOpendir (ctx) (ctx, url);
  45   if (NULL == file)
  46     return false;
  47
  48   // st->st_nlink = 2;
  49   st->st_nlink = 0;
  50   errno = ERANGE;
  51
  52   struct smbc_dirent *dirent;
  53
  54   while (NULL != (dirent = smbc_getFunctionReaddir (ctx) (ctx, file)))
  55     if (SMBC_DIR == dirent->smbc_type)
  56       if (INT_MAX == st->st_nlink++)
  57         break;
  58
  59   (void)smbc_getFunctionClosedir (ctx) (ctx, file);
  60   return (NULL == dirent);
  61 }
  62
  63
  64 int usmb_getattr (const char *filename, struct stat *st)
  65 {
  66   char *url = make_url (filename);
  67   if (NULL == url)
  68     return -ENOMEM;
  69
  70   DEBUG (fprintf (stderr, "stat (%s)\n", url));
  71
  72   int ret = smbc_getFunctionStat (ctx) (ctx, url, st);
  73
  74   if ((0 > ret) || !fix_nlink (url, st))
  75     ret = -errno;
  76
  77   free (url);
  78   return ret;
  79 }
  80
  81
  82 int usmb_fgetattr (const char *filename UNUSED, struct stat *st,
  83                    struct fuse_file_info *fi)
  84 {
  85   SMBCFILE *file = fd_to_smbcfile (fi->fh);
  86   DEBUG (fprintf (stderr, "fgetattr (%s, %p)\n", filename, (void *)file));
  87
  88   if (0 > smbc_getFunctionFstat (ctx) (ctx, file, st))
  89     return -errno;
  90
  91   if (S_ISDIR (st->st_mode))
  92   {
  93     char *url = make_url (filename);
  94     if (NULL == url)
  95       return -ENOMEM;
  96
  97     bool ok = fix_nlink (url, st);
  98     free_errno (url);
  99
 100     if (!ok)
 101       return -errno;
 102   }
 103
 104   return 0;
 105 }
 106
 107
 108 int usmb_unlink (const char *filename)
 109 {
 110   char *url = make_url (filename);
 111   if (NULL == url)
 112     return -ENOMEM;
 113
 114   DEBUG (fprintf (stderr, "unlink (%s)\n", url));
 115   int ret = (0 > smbc_getFunctionUnlink (ctx) (ctx, url)) ? -errno : 0;
 116   free (url);
 117   return ret;
 118 }
 119
 120
 121 int usmb_open (const char *filename, struct fuse_file_info *fi)
 122 {
 123   char *url = make_url (filename);
 124   if (NULL == url)
 125     return -ENOMEM;
 126
 127   DEBUG (fprintf (stderr, "open (%s, %d)", url, fi->flags));
 128   SMBCFILE *file = smbc_getFunctionOpen (ctx) (ctx, url, fi->flags, 0);
 129   DEBUG (fprintf (stderr, " = %p\n", (void *)file));
 130
 131   int ret = (NULL == file) ? -errno : 0;
 132   free (url);
 133   fi->fh = smbcfile_to_fd (file);
 134
 135   return ret;
 136 }
 137
 138
 139 int usmb_release (const char *filename UNUSED, struct fuse_file_info *fi)
 140 {
 141   SMBCFILE *file = fd_to_smbcfile (fi->fh);
 142   DEBUG (fprintf (stderr, "release (%s, %p)\n", filename, (void *)file));
 143   return (0 > smbc_getFunctionClose (ctx) (ctx, file)) ? -errno : 0;
 144 }
 145
 146
 147 int usmb_read (const char *filename UNUSED, char *buff, size_t len, off_t off,
 148                struct fuse_file_info *fi)
 149 {
 150   assert (32768 >= len);
 151
 152   SMBCFILE *file = fd_to_smbcfile (fi->fh);
 153   DEBUG (fprintf (stderr, "read (%p, %p, %u, %lld) ",
 154                   (void *)file, buff, len, off));
 155
 156   if (0 > smbc_getFunctionLseek (ctx) (ctx, file, off, SEEK_SET))
 157   {
 158     fprintf (stderr, "- seek failed: %d\n", -errno);
 159     return -errno;
 160   }
 161
 162   int bytes = smbc_getFunctionRead (ctx) (ctx, file, buff, len);
 163   DEBUG (fprintf (stderr, "= %d\n", bytes));
 164   return (0 > bytes) ? -errno : (int)bytes;
 165 }
 166
 167
 168 int usmb_write (const char *filename UNUSED, const char *buff, size_t len,
 169                 off_t off, struct fuse_file_info *fi)
 170 {
 171   SMBCFILE *file = fd_to_smbcfile (fi->fh);
 172   DEBUG (fprintf (stderr, "write (%p, %p, len=%u, off=%lld) ",
 173                   (void *)file, buff, len, off));
 174
 175   if (0 > smbc_getFunctionLseek (ctx) (ctx, file, off, SEEK_SET))
 176     return -errno;
 177
 178   size_t written = 0;
 179   int bytes = 0;
 180
 181   // No idea whether Windows servers don't like > 32768 byte writes
 182   // (cf. usmb_read), but taking no chances...
 183
 184   const smbc_write_fn write_fn = smbc_getFunctionWrite (ctx);
 185
 186   while (written < len)
 187   {
 188     bytes = write_fn (ctx, file, (char *)buff, (len > 32768) ? 32768 : len);
 189     if (0 > bytes)
 190       break;
 191
 192     written += bytes;
 193     buff += bytes;
 194
 195     // avoids infinite loops
 196     if (0 == bytes)
 197       break;
 198   }
 199
 200   DEBUG (fprintf (stderr, "= %d\n", (0 > bytes) ? -errno : (int)written));
 201   return (0 > bytes) ? -errno : (int)written;
 202 }
 203
 204
 205 int usmb_create (const char *filename, mode_t mode, struct fuse_file_info *fi)
 206 {
 207   char *url = make_url (filename);
 208   if (NULL == url)
 209     return -ENOMEM;
 210
 211   DEBUG (fprintf (stderr, "creat (%s)", url));
 212
 213   SMBCFILE *file = smbc_getFunctionCreat (ctx) (ctx, url, mode);
 214   DEBUG (fprintf (stderr, " = %p\n", (void *)file));
 215   int ret = (NULL == file) ? -errno : 0;
 216   fi->fh = smbcfile_to_fd (file);
 217
 218   free (url);
 219   return ret;
 220 }
 221
 222
 223 int usmb_rename (const char *from, const char *to)
 224 {
 225   char *fromurl = make_url (from);
 226   if (NULL == fromurl)
 227     return -ENOMEM;
 228
 229   char *tourl = make_url (to);
 230   if (NULL == tourl)
 231   {
 232     free (fromurl);
 233     return -ENOMEM;
 234   }
 235
 236   DEBUG (fprintf (stderr, "rename (%s, %s)\n", fromurl, tourl));
 237   int ret =
 238     (0 > smbc_getFunctionRename (ctx) (ctx, fromurl, ctx, tourl)) ? -errno : 0;
 239   free (tourl);
 240   free (fromurl);
 241   return ret;
 242 }
 243
 244
 245 int usmb_utime (const char *filename, struct utimbuf *utb)
 246 {
 247   struct utimbuf tmp_utb;
 248
 249   if (NULL == utb)
 250   {
 251     for (;;)
 252     {
 253       time_t now = time (NULL);
 254       if ((time_t)-1 != now)
 255       {
 256         tmp_utb.actime = tmp_utb.modtime = now;
 257         break;
 258       }
 259
 260       if (EINTR != errno)
 261         return -errno;
 262     }
 263
 264     utb = &tmp_utb;
 265   }
 266
 267   char *url = make_url (filename);
 268   if (NULL == url)
 269     return -ENOMEM;
 270
 271   struct timeval tv[2] = {
 272     { .tv_sec = utb->actime,  .tv_usec = 0 },
 273     { .tv_sec = utb->modtime, .tv_usec = 0 },
 274   };
 275
 276   DEBUG (fprintf (stderr, "utime (%s)\n", url));
 277   int ret = (0 > smbc_getFunctionUtimes (ctx) (ctx, url, tv)) ? -errno : 0;
 278   free (url);
 279   return ret;
 280 }
 281
 282
 283 #if 0
 284 Samba defines utimes as taking struct timevals rather than timespecs.
 285 int usmb_utimes (const char *filename, const struct timespec ts[2])
 286 {
 287   char *url = make_url (filename);
 288   if (NULL == url)
 289     return -ENOMEM;
 290
 291   DEBUG (fprintf (stderr, "utimes (%s)\n", url));
 292   int ret = (0 > ctx->utimes (ctx, url, ts)) ? -errno : 0;
 293   free (url);
 294   return ret;
 295 }
 296 #endif
 297
 298
 299 int usmb_chmod (const char *filename, mode_t mode)
 300 {
 301   char *url = make_url (filename);
 302   if (NULL == url)
 303     return -ENOMEM;
 304
 305   DEBUG (fprintf (stderr, "chmod (%s, %u)\n", url, mode));
 306   int ret = (0 > smbc_getFunctionChmod (ctx) (ctx, url, mode)) ? -errno : 0;
 307   free (url);
 308   return ret;
 309 }
 310
 311
 312 int usmb_truncate (const char *filename, off_t offset)
 313 {
 314   char *url = make_url (filename);
 315   if (NULL == url)
 316     return -ENOMEM;
 317
 318   SMBCFILE *file = smbc_getFunctionOpen (ctx) (ctx, url, O_WRONLY, 0);
 319   if (NULL == file)
 320   {
 321     int ret = -errno;
 322     free (url);
 323     return ret;
 324   }
 325
 326   int ret = compat_truncate (filename, file, offset);
 327
 328   smbc_getFunctionClose (ctx) (ctx, file);
 329   free (url);
 330   return ret;
 331 }
 332
 333
 334 int usmb_ftruncate (const char *path, off_t size,
 335                     struct fuse_file_info *fi)
 336 {
 337   return compat_truncate (path, fd_to_smbcfile (fi->fh), size);
 338 }
 339