programs/explorer/device.c

   1 /*
   2  * Dynamic devices support
   3  *
   4  * Copyright 2006 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <sys/time.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "winreg.h"
  33 #include "winuser.h"
  34 #include "dbt.h"
  35
  36 #include "wine/library.h"
  37 #include "wine/list.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(explorer);
  41
  42 struct dos_drive
  43 {
  44     struct list entry;
  45     char *udi;
  46     int   drive;
  47 };
  48
  49 static struct list drives_list = LIST_INIT(drives_list);
  50
  51 static char *get_dosdevices_path(void)
  52 {
  53     const char *config_dir = wine_get_config_dir();
  54     size_t len = strlen(config_dir) + sizeof("/dosdevices/a::");
  55     char *path = HeapAlloc( GetProcessHeap(), 0, len );
  56     if (path)
  57     {
  58         strcpy( path, config_dir );
  59         strcat( path, "/dosdevices/a::" );
  60     }
  61     return path;
  62 }
  63
  64 /* send notification about a change to a given drive */
  65 static void send_notify( int drive, int code )
  66 {
  67     DWORD_PTR result;
  68     DEV_BROADCAST_VOLUME info;
  69
  70     info.dbcv_size       = sizeof(info);
  71     info.dbcv_devicetype = DBT_DEVTYP_VOLUME;
  72     info.dbcv_reserved   = 0;
  73     info.dbcv_unitmask   = 1 << drive;
  74     info.dbcv_flags      = DBTF_MEDIA;
  75     SendMessageTimeoutW( HWND_BROADCAST, WM_DEVICECHANGE, code, (LPARAM)&info,
  76                          SMTO_ABORTIFHUNG, 0, &result );
  77 }
  78
  79 static inline int is_valid_device( struct stat *st )
  80 {
  81 #if defined(linux) || defined(__sun__)
  82     return S_ISBLK( st->st_mode );
  83 #else
  84     /* disks are char devices on *BSD */
  85     return S_ISCHR( st->st_mode );
  86 #endif
  87 }
  88
  89 /* find or create a DOS drive for the corresponding device */
  90 static int add_drive( const char *device, const char *type )
  91 {
  92     char *path, *p;
  93     char in_use[26];
  94     struct stat dev_st, drive_st;
  95     int drive, first, last, avail = 0;
  96
  97     if (stat( device, &dev_st ) == -1 || !is_valid_device( &dev_st )) return -1;
  98
  99     if (!(path = get_dosdevices_path())) return -1;
 100     p = path + strlen(path) - 3;
 101
 102     memset( in_use, 0, sizeof(in_use) );
 103
 104     first = 2;
 105     last = 26;
 106     if (type && !strcmp( type, "floppy" ))
 107     {
 108         first = 0;
 109         last = 2;
 110     }
 111
 112     while (avail != -1)
 113     {
 114         avail = -1;
 115         for (drive = first; drive < last; drive++)
 116         {
 117             if (in_use[drive]) continue;  /* already checked */
 118             *p = 'a' + drive;
 119             if (stat( path, &drive_st ) == -1)
 120             {
 121                 if (lstat( path, &drive_st ) == -1 && errno == ENOENT)  /* this is a candidate */
 122                 {
 123                     if (avail == -1)
 124                     {
 125                         p[2] = 0;
 126                         /* if mount point symlink doesn't exist either, it's available */
 127                         if (lstat( path, &drive_st ) == -1 && errno == ENOENT) avail = drive;
 128                         p[2] = ':';
 129                     }
 130                 }
 131                 else in_use[drive] = 1;
 132             }
 133             else
 134             {
 135                 in_use[drive] = 1;
 136                 if (!is_valid_device( &drive_st )) continue;
 137                 if (dev_st.st_rdev == drive_st.st_rdev) goto done;
 138             }
 139         }
 140         if (avail != -1)
 141         {
 142             /* try to use the one we found */
 143             drive = avail;
 144             *p = 'a' + drive;
 145             if (symlink( device, path ) != -1) goto done;
 146             /* failed, retry the search */
 147         }
 148     }
 149     drive = -1;
 150
 151 done:
 152     HeapFree( GetProcessHeap(), 0, path );
 153     return drive;
 154 }
 155
 156 static BOOL set_mount_point( struct dos_drive *drive, const char *mount_point )
 157 {
 158     char *path, *p;
 159     struct stat path_st, mnt_st;
 160     BOOL modified = FALSE;
 161
 162     if (drive->drive == -1) return FALSE;
 163     if (!(path = get_dosdevices_path())) return FALSE;
 164     p = path + strlen(path) - 3;
 165     *p = 'a' + drive->drive;
 166     p[2] = 0;
 167
 168     if (mount_point[0])
 169     {
 170         /* try to avoid unlinking if already set correctly */
 171         if (stat( path, &path_st ) == -1 || stat( mount_point, &mnt_st ) == -1 ||
 172             path_st.st_dev != mnt_st.st_dev || path_st.st_ino != mnt_st.st_ino)
 173         {
 174             unlink( path );
 175             symlink( mount_point, path );
 176             modified = TRUE;
 177         }
 178     }
 179     else
 180     {
 181         if (unlink( path ) != -1) modified = TRUE;
 182     }
 183
 184     HeapFree( GetProcessHeap(), 0, path );
 185     return modified;
 186 }
 187
 188 BOOL add_dos_device( const char *udi, const char *device,
 189                      const char *mount_point, const char *type )
 190 {
 191     struct dos_drive *drive;
 192
 193     /* first check if it already exists */
 194     LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 195     {
 196         if (!strcmp( udi, drive->udi )) goto found;
 197     }
 198
 199     if (!(drive = HeapAlloc( GetProcessHeap(), 0, sizeof(*drive) ))) return FALSE;
 200     if (!(drive->udi = HeapAlloc( GetProcessHeap(), 0, strlen(udi)+1 )))
 201     {
 202         HeapFree( GetProcessHeap(), 0, drive );
 203         return FALSE;
 204     }
 205     strcpy( drive->udi, udi );
 206     list_add_tail( &drives_list, &drive->entry );
 207
 208 found:
 209     drive->drive = add_drive( device, type );
 210     if (drive->drive != -1)
 211     {
 212         HKEY hkey;
 213
 214         set_mount_point( drive, mount_point );
 215
 216         WINE_TRACE( "added device %c: udi %s for %s on %s type %s\n",
 217                     'a' + drive->drive, wine_dbgstr_a(udi), wine_dbgstr_a(device),
 218                     wine_dbgstr_a(mount_point), wine_dbgstr_a(type) );
 219
 220         /* hack: force the drive type in the registry */
 221         if (!RegCreateKeyA( HKEY_LOCAL_MACHINE, "Software\\Wine\\Drives", &hkey ))
 222         {
 223             char name[3] = "a:";
 224             name[0] += drive->drive;
 225             if (!type || strcmp( type, "cdrom" )) type = "floppy";  /* FIXME: default to floppy */
 226             RegSetValueExA( hkey, name, 0, REG_SZ, (const BYTE *)type, strlen(type) + 1 );
 227             RegCloseKey( hkey );
 228         }
 229
 230         send_notify( drive->drive, DBT_DEVICEARRIVAL );
 231     }
 232     return TRUE;
 233 }
 234
 235 BOOL remove_dos_device( const char *udi )
 236 {
 237     HKEY hkey;
 238     struct dos_drive *drive;
 239
 240     LIST_FOR_EACH_ENTRY( drive, &drives_list, struct dos_drive, entry )
 241     {
 242         if (strcmp( udi, drive->udi )) continue;
 243
 244         if (drive->drive != -1)
 245         {
 246             BOOL modified = set_mount_point( drive, "" );
 247
 248             /* clear the registry key too */
 249             if (!RegOpenKeyA( HKEY_LOCAL_MACHINE, "Software\\Wine\\Drives", &hkey ))
 250             {
 251                 char name[3] = "a:";
 252                 name[0] += drive->drive;
 253                 RegDeleteValueA( hkey, name );
 254                 RegCloseKey( hkey );
 255             }
 256
 257             if (modified) send_notify( drive->drive, DBT_DEVICEREMOVECOMPLETE );
 258         }
 259
 260         list_remove( &drive->entry );
 261         HeapFree( GetProcessHeap(), 0, drive->udi );
 262         HeapFree( GetProcessHeap(), 0, drive );
 263         return TRUE;
 264     }
 265     return FALSE;
 266 }