dlls/kernel32/computername.c

   1 /*
   2  * Win32 kernel functions
   3  *
   4  * Copyright 1995 Martin von Loewis and Cameron Heide
   5  * Copyright 1999 Peter Ganten
   6  * Copyright 2002 Martin Wilck
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #ifdef HAVE_NETDB_H
  34 #include <netdb.h>
  35 #endif
  36
  37 #include "ntstatus.h"
  38 #define WIN32_NO_STATUS
  39 #include "windef.h"
  40 #include "winbase.h"
  41 #include "winerror.h"
  42 #include "winnls.h"
  43 #include "winternl.h"
  44 #include "wine/unicode.h"
  45 #include "wine/exception.h"
  46 #include "excpt.h"
  47 #include "wine/debug.h"
  48
  49 #include "kernel_private.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL(computername);
  52
  53 /* Registry key and value names */
  54 static const WCHAR ComputerW[] = {'M','a','c','h','i','n','e','\\',
  55                                   'S','y','s','t','e','m','\\',
  56                                   'C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\',
  57                                   'C','o','n','t','r','o','l','\\',
  58                                   'C','o','m','p','u','t','e','r','N','a','m','e',0};
  59 static const WCHAR ActiveComputerNameW[] =   {'A','c','t','i','v','e','C','o','m','p','u','t','e','r','N','a','m','e',0};
  60 static const WCHAR ComputerNameW[] = {'C','o','m','p','u','t','e','r','N','a','m','e',0};
  61
  62 static const char default_ComputerName[] = "WINE";
  63
  64 #define IS_OPTION_TRUE(ch) ((ch) == 'y' || (ch) == 'Y' || (ch) == 't' || (ch) == 'T' || (ch) == '1')
  65
  66 /***********************************************************************
  67  *                    dns_gethostbyname (INTERNAL)
  68  *
  69  *  From hostname(1):
  70  *  "The FQDN is the name gethostbyname(2) returns for the host name returned by gethostname(2)."
  71  *
  72  *  Wine can use this technique only if the thread-safe gethostbyname_r is available.
  73  */
  74 #ifdef  HAVE_LINUX_GETHOSTBYNAME_R_6
  75 static BOOL dns_gethostbyname ( char *name, int *size )
  76 {
  77     struct hostent* host = NULL;
  78     char *extrabuf;
  79     int ebufsize = 1024;
  80     struct hostent hostentry;
  81     int locerr = ENOBUFS, res = ENOMEM;
  82
  83     extrabuf = HeapAlloc( GetProcessHeap(), 0, ebufsize ) ;
  84
  85     while( extrabuf )
  86     {
  87         res = gethostbyname_r ( name, &hostentry, extrabuf, ebufsize, &host, &locerr );
  88         if( res != ERANGE ) break;
  89         ebufsize *= 2;
  90         extrabuf = HeapReAlloc( GetProcessHeap(), 0, extrabuf, ebufsize ) ;
  91     }
  92
  93     if ( res )
  94         WARN ("Error in gethostbyname_r %d (%d)\n", res, locerr);
  95     else if ( !host )
  96     {
  97         WARN ("gethostbyname_r returned NULL host, locerr = %d\n", locerr);
  98         res = 1;
  99     }
 100     else
 101     {
 102         int len = strlen ( host->h_name );
 103         if ( len < *size )
 104         {
 105             strcpy ( name, host->h_name );
 106             *size = len;
 107         }
 108         else
 109         {
 110             memcpy ( name, host->h_name, *size );
 111             name[*size] = 0;
 112             SetLastError ( ERROR_MORE_DATA );
 113             res = 1;
 114         }
 115     }
 116
 117     HeapFree( GetProcessHeap(), 0, extrabuf );
 118     return !res;
 119 }
 120 #else
 121 #  define dns_gethostbyname(name,size) 0
 122 #endif
 123
 124 /***********************************************************************
 125  *                     dns_fqdn (INTERNAL)
 126  */
 127 static BOOL dns_fqdn ( char *name, int *size )
 128 {
 129     if ( gethostname ( name, *size + 1 ) )
 130     {
 131         switch( errno )
 132         {
 133         case ENAMETOOLONG:
 134             SetLastError ( ERROR_MORE_DATA );
 135         default:
 136             SetLastError ( ERROR_INVALID_PARAMETER );
 137         }
 138         return FALSE;
 139     }
 140
 141     if ( !dns_gethostbyname ( name, size ) )
 142         *size = strlen ( name );
 143
 144     return TRUE;
 145 }
 146
 147 /***********************************************************************
 148  *                     dns_hostname (INTERNAL)
 149  */
 150 static BOOL dns_hostname ( char *name, int *size )
 151 {
 152     char *c;
 153     if ( ! dns_fqdn ( name, size ) ) return FALSE;
 154     c = strchr ( name, '.' );
 155     if (c)
 156     {
 157         *c = 0;
 158         *size = (c - name);
 159     }
 160     return TRUE;
 161 }
 162
 163 /***********************************************************************
 164  *                     dns_domainname (INTERNAL)
 165  */
 166 static BOOL dns_domainname ( char *name, int *size )
 167 {
 168     char *c;
 169     if ( ! dns_fqdn ( name, size ) ) return FALSE;
 170     c = strchr ( name, '.' );
 171     if (c)
 172     {
 173         c += 1;
 174         *size -= (c - name);
 175         memmove ( name, c, *size + 1 );
 176     }
 177     return TRUE;
 178 }
 179
 180 /***********************************************************************
 181  *                      _init_attr    (INTERNAL)
 182  */
 183 inline static void _init_attr ( OBJECT_ATTRIBUTES *attr, UNICODE_STRING *name )
 184 {
 185     attr->Length = sizeof (OBJECT_ATTRIBUTES);
 186     attr->RootDirectory = 0;
 187     attr->ObjectName = name;
 188     attr->Attributes = 0;
 189     attr->SecurityDescriptor = NULL;
 190     attr->SecurityQualityOfService = NULL;
 191 }
 192
 193 /***********************************************************************
 194  *           get_use_dns_option
 195  */
 196 static BOOL get_use_dns_option(void)
 197 {
 198     static const WCHAR NetworkW[] = {'S','o','f','t','w','a','r','e','\\',
 199                                      'W','i','n','e','\\','N','e','t','w','o','r','k',0};
 200     static const WCHAR UseDNSW[] = {'U','s','e','D','n','s','C','o','m','p','u','t','e','r','N','a','m','e',0};
 201
 202     char tmp[80];
 203     HANDLE root, hkey;
 204     DWORD dummy;
 205     OBJECT_ATTRIBUTES attr;
 206     UNICODE_STRING nameW;
 207     BOOL ret = TRUE;
 208
 209     _init_attr( &attr, &nameW );
 210     RtlOpenCurrentUser( KEY_ALL_ACCESS, &root );
 211     attr.RootDirectory = root;
 212     RtlInitUnicodeString( &nameW, NetworkW );
 213
 214     /* @@ Wine registry key: HKCU\Software\Wine\Network */
 215     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ))
 216     {
 217         RtlInitUnicodeString( &nameW, UseDNSW );
 218         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, tmp, sizeof(tmp), &dummy ))
 219         {
 220             WCHAR *str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)tmp)->Data;
 221             ret = IS_OPTION_TRUE( str[0] );
 222         }
 223         NtClose( hkey );
 224     }
 225     NtClose( root );
 226     return ret;
 227 }
 228
 229
 230 /***********************************************************************
 231  *                      COMPUTERNAME_Init    (INTERNAL)
 232  */
 233 void COMPUTERNAME_Init (void)
 234 {
 235     HANDLE hkey = INVALID_HANDLE_VALUE, hsubkey = INVALID_HANDLE_VALUE;
 236     OBJECT_ATTRIBUTES attr;
 237     UNICODE_STRING nameW;
 238     char buf[offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ) + (MAX_COMPUTERNAME_LENGTH + 1) * sizeof( WCHAR )];
 239     DWORD len = sizeof( buf );
 240     LPWSTR computer_name = (LPWSTR) (buf + offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ));
 241     NTSTATUS st = STATUS_INTERNAL_ERROR;
 242
 243     TRACE("(void)\n");
 244     _init_attr ( &attr, &nameW );
 245
 246     RtlInitUnicodeString( &nameW, ComputerW );
 247     if ( ( st = NtCreateKey( &hkey, KEY_ALL_ACCESS, &attr, 0, NULL, 0, NULL ) ) != STATUS_SUCCESS )
 248         goto out;
 249
 250     attr.RootDirectory = hkey;
 251     RtlInitUnicodeString( &nameW, ComputerNameW );
 252     if ( (st = NtCreateKey( &hsubkey, KEY_ALL_ACCESS, &attr, 0, NULL, 0, NULL ) ) != STATUS_SUCCESS )
 253         goto out;
 254
 255     st = NtQueryValueKey( hsubkey, &nameW, KeyValuePartialInformation, buf, len, &len );
 256
 257     if ( st != STATUS_SUCCESS || get_use_dns_option() )
 258     {
 259         char hbuf[256];
 260         int hlen = sizeof (hbuf);
 261         char *dot;
 262         TRACE( "retrieving Unix host name\n" );
 263         if ( gethostname ( hbuf, hlen ) )
 264         {
 265             strcpy ( hbuf, default_ComputerName );
 266             WARN( "gethostname() error: %d, using host name %s\n", errno, hbuf );
 267         }
 268         hbuf[MAX_COMPUTERNAME_LENGTH] = 0;
 269         dot = strchr ( hbuf, '.' );
 270         if ( dot ) *dot = 0;
 271         hlen = strlen ( hbuf );
 272         len = MultiByteToWideChar( CP_ACP, 0, hbuf, hlen + 1, computer_name, MAX_COMPUTERNAME_LENGTH + 1 )
 273             * sizeof( WCHAR );
 274         if ( NtSetValueKey( hsubkey, &nameW, 0, REG_SZ, computer_name, len ) != STATUS_SUCCESS )
 275             WARN ( "failed to set ComputerName\n" );
 276     }
 277     else
 278     {
 279         len = (len - offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ));
 280         TRACE( "found in registry\n" );
 281     }
 282
 283     NtClose( hsubkey );
 284     TRACE(" ComputerName: %s (%u)\n", debugstr_w (computer_name), len);
 285
 286     RtlInitUnicodeString( &nameW, ActiveComputerNameW );
 287     if ( ( st = NtCreateKey( &hsubkey, KEY_ALL_ACCESS, &attr, 0, NULL, REG_OPTION_VOLATILE, NULL ) )
 288          != STATUS_SUCCESS )
 289         goto out;
 290
 291     RtlInitUnicodeString( &nameW, ComputerNameW );
 292     st = NtSetValueKey( hsubkey, &nameW, 0, REG_SZ, computer_name, len );
 293
 294 out:
 295     NtClose( hsubkey );
 296     NtClose( hkey );
 297
 298     if ( st == STATUS_SUCCESS )
 299         TRACE( "success\n" );
 300     else
 301     {
 302         WARN( "status trying to set ComputerName: %x\n", st );
 303         SetLastError ( RtlNtStatusToDosError ( st ) );
 304     }
 305 }
 306
 307
 308 /***********************************************************************
 309  *              GetComputerNameW         (KERNEL32.@)
 310  */
 311 BOOL WINAPI GetComputerNameW(LPWSTR name,LPDWORD size)
 312 {
 313     UNICODE_STRING nameW;
 314     OBJECT_ATTRIBUTES attr;
 315     HANDLE hkey = INVALID_HANDLE_VALUE, hsubkey = INVALID_HANDLE_VALUE;
 316     char buf[offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ) + (MAX_COMPUTERNAME_LENGTH + 1) * sizeof( WCHAR )];
 317     DWORD len = sizeof( buf );
 318     LPWSTR theName = (LPWSTR) (buf + offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ));
 319     NTSTATUS st = STATUS_INVALID_PARAMETER;
 320
 321     TRACE ("%p %p\n", name, size);
 322
 323     _init_attr ( &attr, &nameW );
 324     RtlInitUnicodeString( &nameW, ComputerW );
 325     if ( ( st = NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 326         goto out;
 327
 328     attr.RootDirectory = hkey;
 329     RtlInitUnicodeString( &nameW, ActiveComputerNameW );
 330     if ( ( st = NtOpenKey( &hsubkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 331         goto out;
 332
 333     RtlInitUnicodeString( &nameW, ComputerNameW );
 334     if ( ( st = NtQueryValueKey( hsubkey, &nameW, KeyValuePartialInformation, buf, len, &len ) )
 335          != STATUS_SUCCESS )
 336         goto out;
 337
 338     len = (len -offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data )) / sizeof (WCHAR) - 1;
 339     TRACE ("ComputerName is %s (length %u)\n", debugstr_w ( theName ), len);
 340
 341     if ( *size < len + 1 )
 342     {
 343         *size = len + 1;
 344         st = STATUS_MORE_ENTRIES;
 345     }
 346     else
 347     {
 348         memcpy ( name, theName, len * sizeof (WCHAR) );
 349         name[len] = 0;
 350         *size = len;
 351         st = STATUS_SUCCESS;
 352     }
 353
 354 out:
 355     NtClose ( hsubkey );
 356     NtClose ( hkey );
 357
 358     if ( st == STATUS_SUCCESS )
 359         return TRUE;
 360     else
 361     {
 362         SetLastError ( RtlNtStatusToDosError ( st ) );
 363         WARN ( "Status %u reading computer name from registry\n", st );
 364         return FALSE;
 365     }
 366 }
 367
 368 /***********************************************************************
 369  *              GetComputerNameA         (KERNEL32.@)
 370  */
 371 BOOL WINAPI GetComputerNameA(LPSTR name, LPDWORD size)
 372 {
 373     WCHAR nameW[ MAX_COMPUTERNAME_LENGTH + 1 ];
 374     DWORD sizeW = MAX_COMPUTERNAME_LENGTH + 1;
 375     unsigned int len;
 376     BOOL ret;
 377
 378     if ( !GetComputerNameW (nameW, &sizeW) ) return FALSE;
 379
 380     len = WideCharToMultiByte ( CP_ACP, 0, nameW, -1, NULL, 0, NULL, 0 );
 381     /* for compatibility with Win9x */
 382     __TRY
 383     {
 384         if ( *size < len )
 385         {
 386             *size = len;
 387             SetLastError( ERROR_MORE_DATA );
 388             ret = FALSE;
 389         }
 390         else
 391         {
 392             WideCharToMultiByte ( CP_ACP, 0, nameW, -1, name, len, NULL, 0 );
 393             *size = len - 1;
 394             ret = TRUE;
 395         }
 396     }
 397     __EXCEPT_PAGE_FAULT
 398     {
 399         SetLastError( ERROR_INVALID_PARAMETER );
 400         ret = FALSE;
 401     }
 402     __ENDTRY
 403
 404     return ret;
 405 }
 406
 407 /***********************************************************************
 408  *              GetComputerNameExA         (KERNEL32.@)
 409  */
 410 BOOL WINAPI GetComputerNameExA(COMPUTER_NAME_FORMAT type, LPSTR name, LPDWORD size)
 411 {
 412     char buf[256];
 413     int len = sizeof(buf) - 1, ret;
 414     TRACE("%d, %p, %p\n", type, name, size);
 415     switch( type )
 416     {
 417     case ComputerNameNetBIOS:
 418     case ComputerNamePhysicalNetBIOS:
 419         return GetComputerNameA (name, size);
 420     case ComputerNameDnsHostname:
 421     case ComputerNamePhysicalDnsHostname:
 422         ret = dns_hostname (buf, &len);
 423         break;
 424     case ComputerNameDnsDomain:
 425     case ComputerNamePhysicalDnsDomain:
 426         ret = dns_domainname (buf, &len);
 427         break;
 428     case ComputerNameDnsFullyQualified:
 429     case ComputerNamePhysicalDnsFullyQualified:
 430         ret = dns_fqdn (buf, &len);
 431         break;
 432     default:
 433         SetLastError (ERROR_INVALID_PARAMETER);
 434         return FALSE;
 435     }
 436
 437     if ( ret )
 438     {
 439         TRACE ("-> %s (%d)\n", debugstr_a (buf), len);
 440         if ( *size < len + 1 )
 441         {
 442             *size = len + 1;
 443             SetLastError( ERROR_MORE_DATA );
 444             ret = FALSE;
 445         }
 446         else
 447         {
 448             memcpy( name, buf, len );
 449             name[len] = 0;
 450             *size = len;
 451             ret = TRUE;
 452         }
 453     }
 454
 455     return ret;
 456 }
 457
 458
 459 /***********************************************************************
 460  *              GetComputerNameExW         (KERNEL32.@)
 461  */
 462 BOOL WINAPI GetComputerNameExW( COMPUTER_NAME_FORMAT type, LPWSTR name, LPDWORD size )
 463 {
 464     char buf[256];
 465     int len = sizeof(buf) - 1, ret;
 466
 467     TRACE("%d, %p, %p\n", type, name, size);
 468     switch( type )
 469     {
 470     case ComputerNameNetBIOS:
 471     case ComputerNamePhysicalNetBIOS:
 472         return GetComputerNameW (name, size);
 473     case ComputerNameDnsHostname:
 474     case ComputerNamePhysicalDnsHostname:
 475         ret = dns_hostname (buf, &len);
 476         break;
 477     case ComputerNameDnsDomain:
 478     case ComputerNamePhysicalDnsDomain:
 479         ret = dns_domainname (buf, &len);
 480         break;
 481     case ComputerNameDnsFullyQualified:
 482     case ComputerNamePhysicalDnsFullyQualified:
 483         ret = dns_fqdn (buf, &len);
 484         break;
 485     default:
 486         SetLastError (ERROR_INVALID_PARAMETER);
 487         return FALSE;
 488     }
 489
 490     if ( ret )
 491     {
 492         unsigned int lenW;
 493
 494         TRACE ("-> %s (%d)\n", debugstr_a (buf), len);
 495
 496         lenW = MultiByteToWideChar( CP_ACP, 0, buf, len, NULL, 0 );
 497         if ( *size < lenW + 1 )
 498         {
 499             *size = lenW + 1;
 500             SetLastError( ERROR_MORE_DATA );
 501             ret = FALSE;
 502         }
 503         else
 504         {
 505             MultiByteToWideChar( CP_ACP, 0, buf, len, name, lenW );
 506             name[lenW] = 0;
 507             *size = lenW;
 508             ret = TRUE;
 509         }
 510     }
 511
 512     return ret;
 513 }
 514
 515 /******************************************************************************
 516  * netbios_char (INTERNAL)
 517  */
 518 static WCHAR netbios_char ( WCHAR wc )
 519 {
 520     static const WCHAR special[] = {'!','@','#','$','%','^','&','\'',')','(','-','_','{','}','~'};
 521     static const WCHAR deflt = '_';
 522     unsigned int i;
 523
 524     if ( isalnumW ( wc ) ) return wc;
 525     for ( i = 0; i < sizeof (special) / sizeof (WCHAR); i++ )
 526         if ( wc == special[i] ) return wc;
 527     return deflt;
 528 }
 529
 530 /******************************************************************************
 531  * SetComputerNameW [KERNEL32.@]
 532  *
 533  * Set a new NetBIOS name for the local computer.
 534  *
 535  * PARAMS
 536  *    lpComputerName [I] Address of new computer name
 537  *
 538  * RETURNS
 539  *    Success: TRUE
 540  *    Failure: FALSE
 541  */
 542 BOOL WINAPI SetComputerNameW( LPCWSTR lpComputerName )
 543 {
 544     UNICODE_STRING nameW;
 545     OBJECT_ATTRIBUTES attr;
 546     HANDLE hkey = INVALID_HANDLE_VALUE, hsubkey = INVALID_HANDLE_VALUE;
 547     int plen = strlenW ( lpComputerName );
 548     int i;
 549     NTSTATUS st = STATUS_INTERNAL_ERROR;
 550
 551     if (get_use_dns_option())
 552     {
 553         /* This check isn't necessary, but may help debugging problems. */
 554         WARN( "Disabled by Wine Configuration.\n" );
 555         WARN( "Set \"UseDnsComputerName\" = \"N\" in category [Network] to enable.\n" );
 556         SetLastError ( ERROR_ACCESS_DENIED );
 557         return FALSE;
 558     }
 559
 560     TRACE( "%s\n", debugstr_w (lpComputerName) );
 561
 562     /* Check parameter */
 563     if ( plen > MAX_COMPUTERNAME_LENGTH )
 564         goto out;
 565
 566     /* This is NT behaviour. Win 95/98 would coerce characters. */
 567     for ( i = 0; i < plen; i++ )
 568     {
 569         WCHAR wc = lpComputerName[i];
 570         if ( wc != netbios_char( wc ) )
 571             goto out;
 572     }
 573
 574     _init_attr ( &attr, &nameW );
 575
 576     RtlInitUnicodeString (&nameW, ComputerW);
 577     if ( ( st = NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 578         goto out;
 579     attr.RootDirectory = hkey;
 580     RtlInitUnicodeString( &nameW, ComputerNameW );
 581     if ( ( st = NtOpenKey( &hsubkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 582         goto out;
 583     if ( ( st = NtSetValueKey( hsubkey, &nameW, 0, REG_SZ, lpComputerName, ( plen + 1) * sizeof(WCHAR) ) )
 584          != STATUS_SUCCESS )
 585         goto out;
 586
 587 out:
 588     NtClose( hsubkey );
 589     NtClose( hkey );
 590
 591     if ( st == STATUS_SUCCESS )
 592     {
 593         TRACE( "ComputerName changed\n" );
 594         return TRUE;
 595     }
 596
 597     else
 598     {
 599         SetLastError ( RtlNtStatusToDosError ( st ) );
 600         WARN ( "status %u\n", st );
 601         return FALSE;
 602     }
 603 }
 604
 605 /******************************************************************************
 606  * SetComputerNameA [KERNEL32.@]
 607  *
 608  * See SetComputerNameW.
 609  */
 610 BOOL WINAPI SetComputerNameA( LPCSTR lpComputerName )
 611 {
 612     BOOL ret;
 613     DWORD len = MultiByteToWideChar( CP_ACP, 0, lpComputerName, -1, NULL, 0 );
 614     LPWSTR nameW = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 615
 616     MultiByteToWideChar( CP_ACP, 0, lpComputerName, -1, nameW, len );
 617     ret = SetComputerNameW( nameW );
 618     HeapFree( GetProcessHeap(), 0, nameW );
 619     return ret;
 620 }
 621
 622 /******************************************************************************
 623  * SetComputerNameExW [KERNEL32.@]
 624  *
 625  */
 626 BOOL WINAPI SetComputerNameExW( COMPUTER_NAME_FORMAT type, LPCWSTR lpComputerName )
 627 {
 628     TRACE("%d, %s\n", type, debugstr_w (lpComputerName));
 629     switch( type )
 630     {
 631     case ComputerNameNetBIOS:
 632     case ComputerNamePhysicalNetBIOS:
 633         return SetComputerNameW( lpComputerName );
 634     default:
 635         SetLastError( ERROR_ACCESS_DENIED );
 636         return FALSE;
 637     }
 638 }
 639
 640 /******************************************************************************
 641  * SetComputerNameExA [KERNEL32.@]
 642  *
 643  */
 644 BOOL WINAPI SetComputerNameExA( COMPUTER_NAME_FORMAT type, LPCSTR lpComputerName )
 645 {
 646     TRACE( "%d, %s\n", type, debugstr_a (lpComputerName) );
 647     switch( type )
 648     {
 649     case ComputerNameNetBIOS:
 650     case ComputerNamePhysicalNetBIOS:
 651         return SetComputerNameA( lpComputerName );
 652     default:
 653         SetLastError( ERROR_ACCESS_DENIED );
 654         return FALSE;
 655     }
 656 }
 657
 658 /***********************************************************************
 659  *              DnsHostnameToComputerNameA         (KERNEL32.@)
 660  */
 661 BOOL WINAPI DnsHostnameToComputerNameA(LPCSTR hostname,
 662     LPSTR computername, LPDWORD size)
 663 {
 664     DWORD len;
 665
 666     FIXME("(%s, %p, %p): stub\n", debugstr_a(hostname), computername, size);
 667
 668     if (!hostname || !size) return FALSE;
 669     len = lstrlenA(hostname);
 670
 671     if (len > MAX_COMPUTERNAME_LENGTH)
 672         len = MAX_COMPUTERNAME_LENGTH;
 673
 674     if (*size < len)
 675     {
 676         *size = len;
 677         return FALSE;
 678     }
 679     if (!computername) return FALSE;
 680
 681     memcpy( computername, hostname, len );
 682     computername[len + 1] = 0;
 683     return TRUE;
 684 }
 685
 686 /***********************************************************************
 687  *              DnsHostnameToComputerNameW         (KERNEL32.@)
 688  */
 689 BOOL WINAPI DnsHostnameToComputerNameW(LPCWSTR hostname,
 690     LPWSTR computername, LPDWORD size)
 691 {
 692     DWORD len;
 693
 694     FIXME("(%s, %p, %p): stub\n", debugstr_w(hostname), computername, size);
 695
 696     if (!hostname || !size) return FALSE;
 697     len = lstrlenW(hostname);
 698
 699     if (len > MAX_COMPUTERNAME_LENGTH)
 700         len = MAX_COMPUTERNAME_LENGTH;
 701
 702     if (*size < len)
 703     {
 704         *size = len;
 705         return FALSE;
 706     }
 707     if (!computername) return FALSE;
 708
 709     memcpy( computername, hostname, len * sizeof(WCHAR) );
 710     computername[len + 1] = 0;
 711     return TRUE;
 712 }