win32/syslinux.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2003 Lars Munch Christensen - All Rights Reserved
   4  *   Copyright 1998-2004 H. Peter Anvin - All Rights Reserved
   5  *
   6  *   Based on the Linux installer program for SYSLINUX by H. Peter Anvin
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
  11  *   Boston MA 02111-1307, USA; either version 2 of the License, or
  12  *   (at your option) any later version; incorporated herein by reference.
  13  *
  14  * ----------------------------------------------------------------------- */
  15
  16 /*
  17  * syslinux-mingw.c - Win2k/WinXP installer program for SYSLINUX
  18  */
  19
  20 #include <windows.h>
  21 #include <stdio.h>
  22 #include <ctype.h>
  23
  24 #include "syslinux.h"
  25 #include "libfat.h"
  26
  27 #ifdef __GNUC__
  28 # define noreturn void __attribute__((noreturn))
  29 #else
  30 # define noreturn void
  31 #endif
  32
  33 void error(char* msg);
  34
  35 /* Begin stuff for MBR code */
  36
  37 #include <winioctl.h>
  38
  39 #define SECTOR_SIZE 512
  40 #define PART_TABLE  0x1be
  41 #define PART_SIZE   0x10
  42 #define PART_COUNT  4
  43 #define PART_ACTIVE 0x80
  44
  45 // The following struct should be in the ntddstor.h file, but I didn't have it.
  46 // TODO: Make this a conditional compilation
  47 typedef struct _STORAGE_DEVICE_NUMBER {
  48   DEVICE_TYPE  DeviceType;
  49   ULONG  DeviceNumber;
  50   ULONG  PartitionNumber;
  51 } STORAGE_DEVICE_NUMBER, *PSTORAGE_DEVICE_NUMBER;
  52
  53 BOOL GetStorageDeviceNumberByHandle( HANDLE handle, const STORAGE_DEVICE_NUMBER *sdn ) {
  54   BOOL result = FALSE;
  55   DWORD count;
  56
  57   if ( DeviceIoControl( handle, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL,
  58                         0, (LPVOID)sdn, sizeof( *sdn ), &count, NULL ) ) {
  59     result = TRUE;
  60   }
  61   else {
  62     error("GetDriveNumber: DeviceIoControl failed");
  63   }
  64
  65   return( result );
  66 }
  67
  68 int GetBytesPerSector( HANDLE drive ) {
  69   int result = 0;
  70   DISK_GEOMETRY g;
  71   DWORD count;
  72
  73   if ( DeviceIoControl( drive, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
  74                         &g, sizeof( g ), &count, NULL ) ) {
  75     result = g.BytesPerSector;
  76   }
  77
  78   return( result );
  79 }
  80
  81 BOOL FixMBR(int driveNum, int partitionNum, int write_mbr, int set_active) {
  82   BOOL result = TRUE;
  83   HANDLE drive;
  84
  85   char driveName[128];
  86
  87   sprintf( driveName, "\\\\.\\PHYSICALDRIVE%d", driveNum );
  88
  89   drive = CreateFile( driveName,
  90                       GENERIC_READ | GENERIC_WRITE,
  91                       FILE_SHARE_WRITE | FILE_SHARE_READ,
  92                       NULL,
  93                       OPEN_EXISTING,
  94                       0,
  95                       NULL );
  96
  97   if( drive == INVALID_HANDLE_VALUE ) {
  98     error("Accessing physical drive");
  99     result = FALSE;
 100   }
 101
 102   if( result ) {
 103     unsigned char sector[SECTOR_SIZE];
 104     DWORD howMany;
 105
 106     if( GetBytesPerSector( drive ) != SECTOR_SIZE ) {
 107       fprintf(stderr, "Error: Sector size of this drive is %d; must be %d\n",
 108               GetBytesPerSector( drive ), SECTOR_SIZE );
 109       result = FALSE;
 110     }
 111
 112     if ( result ) {
 113       if ( ReadFile( drive, sector, sizeof( sector ), &howMany, NULL ) == 0 ) {
 114         error("Reading raw drive");
 115         result = FALSE;
 116       } else if ( howMany != sizeof( sector ) ) {
 117         fprintf(stderr, "Error: ReadFile on drive only got %d of %d bytes\n",
 118                 (int)howMany, sizeof( sector ) );
 119         result = FALSE;
 120       }
 121     }
 122
 123     // Copy over the MBR code if specified (-m)
 124     if ( write_mbr ) {
 125       if ( result ) {
 126         if ( syslinux_mbr_len >= PART_TABLE ) {
 127           fprintf(stderr, "Error: MBR will not fit; not writing\n" );
 128           result = FALSE;
 129         } else {
 130           memcpy( sector, syslinux_mbr, syslinux_mbr_len );
 131         }
 132       }
 133     }
 134
 135     // Check that our partition is active if specified (-a)
 136     if ( set_active ) {
 137       if ( sector[ PART_TABLE + ( PART_SIZE * ( partitionNum - 1 ) ) ] != 0x80 ) {
 138         int p;
 139         for ( p = 0; p < PART_COUNT; p++ )
 140           sector[ PART_TABLE + ( PART_SIZE * p ) ] = ( p == partitionNum - 1 ? 0x80 : 0 );
 141       }
 142     }
 143
 144     if ( result ) {
 145       SetFilePointer( drive, 0, NULL, FILE_BEGIN );
 146
 147       if ( WriteFile( drive, sector, sizeof( sector ), &howMany, NULL ) == 0 ) {
 148         error("Writing MBR");
 149         result = FALSE;
 150       } else if ( howMany != sizeof( sector ) ) {
 151         fprintf(stderr, "Error: WriteFile on drive only wrote %d of %d bytes\n",
 152                 (int)howMany, sizeof( sector ) );
 153         result = FALSE;
 154       }
 155     }
 156
 157     if( !CloseHandle( drive ) ) {
 158       error("CloseFile on drive");
 159       result = FALSE;
 160     }
 161   }
 162
 163   return( result );
 164 }
 165
 166 /* End stuff for MBR code */
 167
 168 const char *program;            /* Name of program */
 169 const char *drive;              /* Drive to install to */
 170
 171 /*
 172  * Check Windows version.
 173  *
 174  * On Windows Me/98/95 you cannot open a directory, physical disk, or
 175  * volume using CreateFile.
 176  */
 177 int checkver(void)
 178 {
 179   OSVERSIONINFO osvi;
 180
 181   osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 182   GetVersionEx(&osvi);
 183
 184   return  (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
 185           ((osvi.dwMajorVersion > 4) ||
 186           ((osvi.dwMajorVersion == 4) && (osvi.dwMinorVersion == 0)));
 187 }
 188
 189 /*
 190  * Windows error function
 191  */
 192 void error(char* msg)
 193 {
 194   LPVOID lpMsgBuf;
 195
 196   /* Format the Windows error message */
 197   FormatMessage(
 198                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
 199                 FORMAT_MESSAGE_FROM_SYSTEM |
 200                 FORMAT_MESSAGE_IGNORE_INSERTS,
 201                 NULL, GetLastError(),
 202                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
 203                 (LPTSTR) &lpMsgBuf, 0, NULL );
 204
 205   /* Print it */
 206   fprintf(stderr, "%s: %s", msg, (char*) lpMsgBuf);
 207
 208   /* Free the buffer */
 209   LocalFree(lpMsgBuf);
 210 }
 211
 212 /*
 213  * Wrapper for ReadFile suitable for libfat
 214  */
 215 int libfat_readfile(intptr_t pp, void *buf, size_t secsize, libfat_sector_t sector)
 216 {
 217   uint64_t offset = (uint64_t)sector * secsize;
 218   LONG loword = (LONG)offset;
 219   LONG hiword  = (LONG)(offset >> 32);
 220   LONG hiwordx = hiword;
 221   DWORD bytes_read;
 222
 223   if ( SetFilePointer((HANDLE)pp, loword, &hiwordx, FILE_BEGIN) != loword ||
 224        hiword != hiwordx ||
 225        !ReadFile((HANDLE)pp, buf, secsize, &bytes_read, NULL) ||
 226        bytes_read != secsize ) {
 227     fprintf(stderr, "Cannot read sector %u\n", sector);
 228     exit(1);
 229   }
 230
 231   return secsize;
 232 }
 233
 234 noreturn usage(void)
 235 {
 236   fprintf(stderr, "Usage: syslinux.exe [-sfma] <drive>: [bootsecfile]\n");
 237   exit(1);
 238 }
 239
 240 int main(int argc, char *argv[])
 241 {
 242   HANDLE f_handle, d_handle;
 243   DWORD bytes_read;
 244   DWORD bytes_written;
 245   DWORD drives;
 246   UINT drive_type;
 247
 248   static unsigned char sectbuf[512];
 249   char **argp, *opt;
 250   static char drive_name[] = "\\\\.\\?:";
 251   static char drive_root[] = "?:\\";
 252   static char ldlinux_name[] = "?:\\ldlinux.sys" ;
 253   const char *errmsg;
 254   struct libfat_filesystem *fs;
 255   libfat_sector_t s, *secp, sectors[65]; /* 65 is maximum possible */
 256   uint32_t ldlinux_cluster;
 257   int nsectors;
 258   const char *bootsecfile = NULL;
 259
 260   int force = 0;                /* -f (force) option */
 261   int mbr = 0;                  /* -m (MBR) option */
 262   int setactive = 0;            /* -a (set partition active) */
 263
 264   (void)argc;
 265
 266   if (!checkver()) {
 267     fprintf(stderr, "You need to be running at least Windows NT; use syslinux.com instead.\n");
 268     exit(1);
 269   }
 270
 271   program = argv[0];
 272   drive = NULL;
 273
 274   for ( argp = argv+1 ; *argp ; argp++ ) {
 275     if ( **argp == '-' ) {
 276       opt = *argp + 1;
 277       if ( !*opt )
 278         usage();
 279
 280       while ( *opt ) {
 281         switch ( *opt ) {
 282         case 's':               /* Use "safe, slow and stupid" code */
 283           syslinux_make_stupid();
 284           break;
 285         case 'f':               /* Force install */
 286           force = 1;
 287           break;
 288         case 'm':               /* Install MBR */
 289           mbr = 1;
 290           break;
 291         case 'a':               /* Mark this partition active */
 292           setactive = 1;
 293           break;
 294         default:
 295           usage();
 296           break;
 297         }
 298         opt++;
 299       }
 300     } else {
 301       if ( bootsecfile )
 302         usage();
 303       else if ( drive )
 304         bootsecfile = *argp;
 305       else
 306         drive = *argp;
 307     }
 308   }
 309
 310   if ( !drive || !isalpha(drive[0]) || drive[1] != ':' || drive[2] )
 311     usage();
 312
 313   /* Test if drive exists */
 314   drives = GetLogicalDrives();
 315   if(!(drives & ( 1 << (tolower(drive[0]) - 'a')))) {
 316     fprintf(stderr, "No such drive %c:\n", drive[0]);
 317     exit(1);
 318   }
 319
 320   /* Determines the drive type */
 321   drive_name[4]   = drive[0];
 322   ldlinux_name[0] = drive[0];
 323   drive_root[0]   = drive[0];
 324   drive_type = GetDriveType(drive_root);
 325
 326   /* Test for removeable media */
 327   if ((drive_type == DRIVE_FIXED) && (force == 0)) {
 328     fprintf(stderr, "Not a removable drive (use -f to override) \n");
 329     exit(1);
 330   }
 331
 332   /* Test for unsupported media */
 333   if ((drive_type != DRIVE_FIXED) && (drive_type != DRIVE_REMOVABLE)) {
 334     fprintf(stderr, "Unsupported media\n");
 335     exit(1);
 336   }
 337
 338   /*
 339    * First open the drive
 340    */
 341   d_handle = CreateFile(drive_name, GENERIC_READ | GENERIC_WRITE,
 342                          FILE_SHARE_READ | FILE_SHARE_WRITE,
 343                          NULL, OPEN_EXISTING, 0, NULL );
 344
 345   if (d_handle == INVALID_HANDLE_VALUE) {
 346     error("Could not open drive");
 347     exit(1);
 348   }
 349
 350   /*
 351    * Make sure we can read the boot sector
 352    */
 353   if ( !ReadFile(d_handle, sectbuf, 512, &bytes_read, NULL) ) {
 354     error("Reading boot sector");
 355     exit(1);
 356   }
 357   if (bytes_read != 512) {
 358     fprintf(stderr, "Could not read the whole boot sector\n");
 359     exit(1);
 360   }
 361
 362   /* Check to see that what we got was indeed an MS-DOS boot sector/superblock */
 363   if( (errmsg = syslinux_check_bootsect(sectbuf)) ) {
 364     fprintf(stderr, "%s\n", errmsg);
 365     exit(1);
 366   }
 367
 368   /* Change to normal attributes to enable deletion */
 369   /* Just ignore error if the file do not exists */
 370   SetFileAttributes(ldlinux_name, FILE_ATTRIBUTE_NORMAL);
 371
 372   /* Delete the file */
 373   /* Just ignore error if the file do not exists */
 374   DeleteFile(ldlinux_name);
 375
 376   /* Create ldlinux.sys file */
 377   f_handle = CreateFile(ldlinux_name, GENERIC_READ | GENERIC_WRITE,
 378                         FILE_SHARE_READ | FILE_SHARE_WRITE,
 379                         NULL, CREATE_ALWAYS,
 380                         FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM |
 381                         FILE_ATTRIBUTE_HIDDEN,
 382                         NULL );
 383
 384   if (f_handle == INVALID_HANDLE_VALUE) {
 385     error("Unable to create ldlinux.sys");
 386     exit(1);
 387   }
 388
 389   /* Write ldlinux.sys file */
 390   if (!WriteFile(f_handle, syslinux_ldlinux, syslinux_ldlinux_len, &bytes_written, NULL)) {
 391     error("Could not write ldlinux.sys");
 392     exit(1);
 393   }
 394
 395   if (bytes_written != syslinux_ldlinux_len) {
 396     fprintf(stderr, "Could not write whole ldlinux.sys\n");
 397     exit(1);
 398   }
 399
 400   /* Now flush the media */
 401   if(!FlushFileBuffers(f_handle)) {
 402     error("FlushFileBuffers failed");
 403     exit(1);
 404   }
 405
 406   /* Map the file (is there a better way to do this?) */
 407   fs = libfat_open(libfat_readfile, (intptr_t)d_handle);
 408   ldlinux_cluster = libfat_searchdir(fs, 0, "LDLINUX SYS", NULL);
 409   secp = sectors;
 410   nsectors = 0;
 411   s = libfat_clustertosector(fs, ldlinux_cluster);
 412   while ( s && nsectors < 65 ) {
 413     *secp++ = s;
 414     nsectors++;
 415     s = libfat_nextsector(fs, s);
 416   }
 417   libfat_close(fs);
 418
 419   /*
 420    * Patch ldlinux.sys and the boot sector
 421    */
 422   syslinux_patch(sectors, nsectors);
 423
 424   /*
 425    * Rewrite the file
 426    */
 427   if ( SetFilePointer(f_handle, 0, NULL, FILE_BEGIN) != 0 ||
 428        !WriteFile(f_handle, syslinux_ldlinux, syslinux_ldlinux_len, &bytes_written, NULL) ||
 429        bytes_written != syslinux_ldlinux_len ) {
 430     error("Could not write ldlinux.sys");
 431     exit(1);
 432   }
 433
 434   /* If desired, fix the MBR */
 435   if( mbr || setactive ) {
 436     STORAGE_DEVICE_NUMBER sdn;
 437     if( GetStorageDeviceNumberByHandle( d_handle, &sdn ) ) {
 438       if( !FixMBR(sdn.DeviceNumber, sdn.PartitionNumber, mbr, setactive) ) {
 439         fprintf(stderr, "Did not successfully update the MBR; continuing...\n");
 440       }
 441     } else {
 442       fprintf(stderr, "Could not find device number for updating MBR; continuing...\n");
 443     }
 444   }
 445
 446   /* Close file */
 447   CloseHandle(f_handle);
 448
 449   /* Make the syslinux boot sector */
 450   syslinux_make_bootsect(sectbuf);
 451
 452   /* Write the syslinux boot sector into the boot sector */
 453   if ( bootsecfile ) {
 454     f_handle = CreateFile(bootsecfile, GENERIC_READ | GENERIC_WRITE,
 455                           FILE_SHARE_READ | FILE_SHARE_WRITE,
 456                           NULL, CREATE_ALWAYS,
 457                           FILE_ATTRIBUTE_ARCHIVE,
 458                           NULL );
 459     if (f_handle == INVALID_HANDLE_VALUE) {
 460       error("Unable to create bootsector file");
 461       exit(1);
 462     }
 463     if (!WriteFile(f_handle, sectbuf, 512, &bytes_written, NULL)) {
 464       error("Could not write boot sector file");
 465       exit(1);
 466     }
 467     CloseHandle(f_handle);
 468   } else {
 469     SetFilePointer(d_handle, 0, NULL, FILE_BEGIN);
 470     WriteFile( d_handle, sectbuf, 512, &bytes_written, NULL ) ;
 471   }
 472
 473   if(bytes_written != 512) {
 474     fprintf(stderr, "Could not write the whole boot sector\n");
 475     exit(1);
 476   }
 477
 478   /* Close file */
 479   CloseHandle(d_handle);
 480
 481   /* Done! */
 482   return 0;
 483 }