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