usmb.c

   1 /* usmb - mount SMB shares via FUSE and Samba
   2  * Copyright (C) 2006-2008 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 <sys/time.h>        // struct timeval needed by libsmbclient.h
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20 #include <unistd.h>
  21 #include <libsmbclient.h>
  22 #include <fuse.h>
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <stdarg.h>
  26 #include <stdbool.h>
  27 #include <stddef.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include "conffile.h"
  32 #include "options.h"
  33 #include "usmb.h"
  34 #include "usmb_dir.h"
  35 #include "usmb_file.h"
  36 #include "utils.h"
  37 #include "version.h"
  38
  39
  40 SMBCCTX *ctx;
  41 static char *server, *share, *mountpoint, *options,
  42             *domain, *username, *password;
  43
  44
  45 char * make_url (const char *path)
  46 {
  47   assert (NULL != share);
  48
  49   if ((NULL == path) || ('\0' == path[0]))
  50     return xstrdup (share);
  51   else
  52     return concat_strings (2, share, path);
  53 }
  54
  55
  56 static inline void do_strncpy (char *to, const char *from, int tolen)
  57 {
  58   strncpy (to, from, tolen);
  59   to[tolen - 1] = '\0';
  60 }
  61
  62
  63 static void auth_fn (const char *srv, const char *shr, char *wg, int wglen,
  64                      char *un, int unlen, char *pw, int pwlen)
  65 {
  66   (void)srv;
  67   (void)shr;
  68   DEBUG (fprintf (stderr, "Authenticating for \\\\%s\\%s\n", srv, shr));
  69   DEBUG (fprintf (stderr, "Domain: %s; User: %s; Password:%s\n",
  70                   domain, username, password));
  71
  72   if (NULL != domain)
  73     do_strncpy (wg, domain, wglen);
  74
  75   do_strncpy (un, username, unlen);
  76   do_strncpy (pw, password, pwlen);
  77 }
  78
  79
  80 static bool create_smb_context (char *domain, char *username, SMBCCTX **pctx)
  81 {
  82   *pctx = smbc_new_context();
  83
  84   if (NULL == *pctx)
  85   {
  86     perror ("Cannot create SMB context");
  87     return false;
  88   }
  89
  90   (*pctx)->workgroup = domain;
  91   (*pctx)->user = username;
  92   (*pctx)->timeout = 5000;
  93   (*pctx)->callbacks.auth_fn = auth_fn;
  94
  95   if (NULL == smbc_init_context (*pctx))
  96   {
  97     perror ("Cannot initialise SMB context");
  98     smbc_free_context (*pctx, 1);
  99     return false;
 100   }
 101
 102   return true;
 103 }
 104
 105
 106 #if 0
 107 static int usmb_statfs (const char *path, struct statvfs *vfs)
 108 {
 109   if ((NULL == path) || (NULL == vfs))
 110     return -EINVAL;
 111
 112   memset (vfs, 0, sizeof (*vfs));
 113
 114   vfs->f_bsize = 32768;
 115   vfs->f_blocks = 0x7FFFFFFFl;
 116   vfs->f_bfree = 0x7FFFFFFFl;
 117   vfs->f_bavail = 0x7FFFFFFFl;
 118
 119   return 0;
 120 }
 121 #endif
 122
 123
 124 static void * usmb_init (struct fuse_conn_info *conn)
 125 {
 126   DEBUG (fputs ("usmb_init()\n", stderr));
 127   (void)conn;
 128   return NULL;
 129 }
 130
 131
 132 static void usmb_destroy (void *unused)
 133 {
 134   (void)unused;
 135   DEBUG (fputs ("usmb_destroy()\n", stderr));
 136 }
 137
 138
 139 // probably won't (can't ?) implement these:
 140 // readlink mknod symlink flush fsync
 141
 142 // fuse.h says "Just a placeholder, don't set".
 143 // statfs
 144
 145 // no easy way of implementing these.
 146 // access ftruncate
 147
 148 #ifdef __lint
 149 #define SET_ELEMENT(name,value) value
 150 #else
 151 #define SET_ELEMENT(name,value) name = value
 152 #endif
 153 static struct fuse_operations fuse_ops = {
 154   SET_ELEMENT (.getattr, usmb_getattr),
 155   SET_ELEMENT (.readlink, NULL),
 156   SET_ELEMENT (.getdir, NULL),
 157   SET_ELEMENT (.mknod, NULL),
 158   SET_ELEMENT (.mkdir, usmb_mkdir),
 159   SET_ELEMENT (.unlink, usmb_unlink),
 160   SET_ELEMENT (.rmdir, usmb_rmdir),
 161   SET_ELEMENT (.symlink, NULL),
 162   SET_ELEMENT (.rename, usmb_rename),
 163   SET_ELEMENT (.link, NULL),
 164   SET_ELEMENT (.chmod, usmb_chmod),
 165   SET_ELEMENT (.chown, NULL), // usmb_chown, --not implemented in libsmbclient
 166   SET_ELEMENT (.truncate, usmb_truncate),
 167   SET_ELEMENT (.utime, usmb_utime),
 168   SET_ELEMENT (.open, usmb_open),
 169   SET_ELEMENT (.read, usmb_read),
 170   SET_ELEMENT (.write, usmb_write),
 171   SET_ELEMENT (.statfs, NULL),
 172   SET_ELEMENT (.flush, NULL),
 173   SET_ELEMENT (.release, usmb_release),
 174   SET_ELEMENT (.fsync, NULL),
 175   SET_ELEMENT (.setxattr, usmb_setxattr),
 176   SET_ELEMENT (.getxattr, usmb_getxattr),
 177   SET_ELEMENT (.listxattr, usmb_listxattr),
 178   SET_ELEMENT (.removexattr, usmb_removexattr),
 179   SET_ELEMENT (.opendir, usmb_opendir),
 180   SET_ELEMENT (.readdir, usmb_readdir),
 181   SET_ELEMENT (.releasedir, usmb_releasedir),
 182   SET_ELEMENT (.fsyncdir, NULL),
 183   SET_ELEMENT (.init, usmb_init),
 184   SET_ELEMENT (.destroy, usmb_destroy),
 185   SET_ELEMENT (.access, NULL),
 186   SET_ELEMENT (.create, usmb_create),
 187   SET_ELEMENT (.ftruncate, NULL),
 188   SET_ELEMENT (.fgetattr, usmb_fgetattr),
 189   SET_ELEMENT (.lock, NULL),                   // TODO: implement
 190   SET_ELEMENT (.utimens, NULL),                // TODO: implement
 191   SET_ELEMENT (.bmap, NULL),                   // TODO: implement
 192 };
 193
 194
 195 // this should really open() the file and check the fd, but the XML parser
 196 // takes a filename, not a file descriptor
 197 static bool check_conf_perms (const char *conffile)
 198 {
 199   struct stat buf;
 200   if (0 == stat (conffile, &buf))
 201   {
 202     if (getuid() != buf.st_uid)
 203     {
 204       fprintf (stderr, "You do not own the configuration file %s\n",
 205                conffile);
 206       return false;
 207     }
 208
 209     if (buf.st_mode & (S_IRWXG | S_IRWXO))
 210     {
 211       fprintf (stderr, "Configuration file %s is accessible to non-owner\n",
 212                conffile);
 213       return false;
 214     }
 215   }
 216   else
 217   {
 218     fprintf (stderr, "Cannot stat configuration file %s: %s\n",
 219              conffile, strerror (errno));
 220     return false;
 221   }
 222
 223   return true;
 224 }
 225
 226
 227 static bool create_share_name (const char *server, const char *sharename)
 228 {
 229   size_t len = strlen ("smb:///") +
 230                strlen (server) +
 231                strlen (sharename) + 1;
 232
 233   if (NULL == (share = malloc (len)))
 234   {
 235     perror ("Cannot allocate share name");
 236     return false;
 237   }
 238
 239   snprintf (share, len, "smb://%s/%s", server, sharename);
 240   DEBUG (fprintf (stderr, "Share URL: %s\n", share));
 241   return true;
 242 }
 243
 244
 245 static void free_strings (char *sharename)
 246 {
 247   xfree (sharename);
 248   clear_and_free (password);
 249   xfree (username);
 250   xfree (domain);
 251   xfree (options);
 252   xfree (mountpoint);
 253   xfree (share);
 254   xfree (server);
 255 }
 256
 257
 258 int main (int argc, char **argv)
 259 {
 260   const char *conffile, *mountid;
 261   char *sharename = NULL;
 262
 263   if (sizeof (uint64_t) < sizeof (uintptr_t))
 264   {
 265     fputs ("usmb is not supported on this platform.\n", stderr);
 266     return EXIT_FAILURE;
 267   }
 268
 269   {
 270     static char conf[256];
 271     snprintf (conf, sizeof (conf), "%s/.usmb.conf", getenv ("HOME"));
 272     conffile = conf;
 273   }
 274
 275   if (!parse_args (&argc, &argv, &mountid, &conffile))
 276     return EXIT_FAILURE;
 277
 278   show_about (stdout);
 279
 280   if (!check_conf_perms (conffile) ||
 281       !conffile_get_mount (conffile, mountid,
 282                            &server, &sharename, &mountpoint, &options,
 283                            &domain, &username, &password))
 284     return EXIT_FAILURE;
 285
 286   if (!create_share_name (server, sharename) ||
 287       !create_smb_context (domain, username, &ctx))
 288   {
 289     free_strings (sharename);
 290     return EXIT_FAILURE;
 291   }
 292
 293   DEBUG (fprintf (stderr, "Username: %s\\%s\n", domain, username));
 294
 295   int fuse_argc;
 296   char **fuse_argv;
 297   build_fuse_args (options, mountpoint, &fuse_argc, &fuse_argv);
 298   int ret = fuse_main (fuse_argc, fuse_argv, &fuse_ops, NULL);
 299
 300   smbc_free_context (ctx, 1);
 301   free_strings (sharename);
 302
 303   return ret;
 304 }
 305