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
  96     {
  97         int len = strlen ( host->h_name );
  98         if ( len < *size )
  99         {
 100             strcpy ( name, host->h_name );
 101             *size = len;
 102         }
 103         else
 104         {
 105             memcpy ( name, host->h_name, *size );
 106             name[*size] = 0;
 107             SetLastError ( ERROR_MORE_DATA );
 108             res = 1;
 109         }
 110     }
 111
 112     HeapFree( GetProcessHeap(), 0, extrabuf );
 113     return !res;
 114 }
 115 #else
 116 #  define dns_gethostbyname(name,size) 0
 117 #endif
 118
 119 /***********************************************************************
 120  *                     dns_fqdn (INTERNAL)
 121  */
 122 static BOOL dns_fqdn ( char *name, int *size )
 123 {
 124     if ( gethostname ( name, *size + 1 ) )
 125     {
 126         switch( errno )
 127         {
 128         case ENAMETOOLONG:
 129             SetLastError ( ERROR_MORE_DATA );
 130         default:
 131             SetLastError ( ERROR_INVALID_PARAMETER );
 132         }
 133         return FALSE;
 134     }
 135
 136     if ( !dns_gethostbyname ( name, size ) )
 137         *size = strlen ( name );
 138
 139     return TRUE;
 140 }
 141
 142 /***********************************************************************
 143  *                     dns_hostname (INTERNAL)
 144  */
 145 static BOOL dns_hostname ( char *name, int *size )
 146 {
 147     char *c;
 148     if ( ! dns_fqdn ( name, size ) ) return FALSE;
 149     c = strchr ( name, '.' );
 150     if (c)
 151     {
 152         *c = 0;
 153         *size = (c - name);
 154     }
 155     return TRUE;
 156 }
 157
 158 /***********************************************************************
 159  *                     dns_domainname (INTERNAL)
 160  */
 161 static BOOL dns_domainname ( char *name, int *size )
 162 {
 163     char *c;
 164     if ( ! dns_fqdn ( name, size ) ) return FALSE;
 165     c = strchr ( name, '.' );
 166     if (c)
 167     {
 168         c += 1;
 169         *size -= (c - name);
 170         memmove ( name, c, *size + 1 );
 171     }
 172     return TRUE;
 173 }
 174
 175 /***********************************************************************
 176  *                      _init_attr    (INTERNAL)
 177  */
 178 inline static void _init_attr ( OBJECT_ATTRIBUTES *attr, UNICODE_STRING *name )
 179 {
 180     attr->Length = sizeof (OBJECT_ATTRIBUTES);
 181     attr->RootDirectory = 0;
 182     attr->ObjectName = name;
 183     attr->Attributes = 0;
 184     attr->SecurityDescriptor = NULL;
 185     attr->SecurityQualityOfService = NULL;
 186 }
 187
 188 /***********************************************************************
 189  *           get_use_dns_option
 190  */
 191 static BOOL get_use_dns_option(void)
 192 {
 193     static const WCHAR NetworkW[] = {'S','o','f','t','w','a','r','e','\\',
 194                                      'W','i','n','e','\\','N','e','t','w','o','r','k',0};
 195     static const WCHAR UseDNSW[] = {'U','s','e','D','n','s','C','o','m','p','u','t','e','r','N','a','m','e',0};
 196
 197     char tmp[80];
 198     HANDLE root, hkey;
 199     DWORD dummy;
 200     OBJECT_ATTRIBUTES attr;
 201     UNICODE_STRING nameW;
 202     BOOL ret = TRUE;
 203
 204     _init_attr( &attr, &nameW );
 205     RtlOpenCurrentUser( KEY_ALL_ACCESS, &root );
 206     attr.RootDirectory = root;
 207     RtlInitUnicodeString( &nameW, NetworkW );
 208
 209     /* @@ Wine registry key: HKCU\Software\Wine\Network */
 210     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ))
 211     {
 212         RtlInitUnicodeString( &nameW, UseDNSW );
 213         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, tmp, sizeof(tmp), &dummy ))
 214         {
 215             WCHAR *str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)tmp)->Data;
 216             ret = IS_OPTION_TRUE( str[0] );
 217         }
 218         NtClose( hkey );
 219     }
 220     NtClose( root );
 221     return ret;
 222 }
 223
 224
 225 /***********************************************************************
 226  *                      COMPUTERNAME_Init    (INTERNAL)
 227  */
 228 void COMPUTERNAME_Init (void)
 229 {
 230     HANDLE hkey = INVALID_HANDLE_VALUE, hsubkey = INVALID_HANDLE_VALUE;
 231     OBJECT_ATTRIBUTES attr;
 232     UNICODE_STRING nameW;
 233     char buf[offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ) + (MAX_COMPUTERNAME_LENGTH + 1) * sizeof( WCHAR )];
 234     DWORD len = sizeof( buf );
 235     LPWSTR computer_name = (LPWSTR) (buf + offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ));
 236     NTSTATUS st = STATUS_INTERNAL_ERROR;
 237
 238     TRACE("(void)\n");
 239     _init_attr ( &attr, &nameW );
 240
 241     RtlInitUnicodeString( &nameW, ComputerW );
 242     if ( ( st = NtCreateKey( &hkey, KEY_ALL_ACCESS, &attr, 0, NULL, 0, NULL ) ) != STATUS_SUCCESS )
 243         goto out;
 244
 245     attr.RootDirectory = hkey;
 246     RtlInitUnicodeString( &nameW, ComputerNameW );
 247     if ( (st = NtCreateKey( &hsubkey, KEY_ALL_ACCESS, &attr, 0, NULL, 0, NULL ) ) != STATUS_SUCCESS )
 248         goto out;
 249
 250     st = NtQueryValueKey( hsubkey, &nameW, KeyValuePartialInformation, buf, len, &len );
 251
 252     if ( st != STATUS_SUCCESS || get_use_dns_option() )
 253     {
 254         char hbuf[256];
 255         int hlen = sizeof (hbuf);
 256         char *dot;
 257         TRACE( "retrieving Unix host name\n" );
 258         if ( gethostname ( hbuf, hlen ) )
 259         {
 260             strcpy ( hbuf, default_ComputerName );
 261             WARN( "gethostname() error: %d, using host name %s\n", errno, hbuf );
 262         }
 263         hbuf[MAX_COMPUTERNAME_LENGTH] = 0;
 264         dot = strchr ( hbuf, '.' );
 265         if ( dot ) *dot = 0;
 266         hlen = strlen ( hbuf );
 267         len = MultiByteToWideChar( CP_ACP, 0, hbuf, hlen + 1, computer_name, MAX_COMPUTERNAME_LENGTH + 1 )
 268             * sizeof( WCHAR );
 269         if ( NtSetValueKey( hsubkey, &nameW, 0, REG_SZ, computer_name, len ) != STATUS_SUCCESS )
 270             WARN ( "failed to set ComputerName\n" );
 271     }
 272     else
 273     {
 274         len = (len - offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ));
 275         TRACE( "found in registry\n" );
 276     }
 277
 278     NtClose( hsubkey );
 279     TRACE(" ComputerName: %s (%u)\n", debugstr_w (computer_name), len);
 280
 281     RtlInitUnicodeString( &nameW, ActiveComputerNameW );
 282     if ( ( st = NtCreateKey( &hsubkey, KEY_ALL_ACCESS, &attr, 0, NULL, REG_OPTION_VOLATILE, NULL ) )
 283          != STATUS_SUCCESS )
 284         goto out;
 285
 286     RtlInitUnicodeString( &nameW, ComputerNameW );
 287     st = NtSetValueKey( hsubkey, &nameW, 0, REG_SZ, computer_name, len );
 288
 289 out:
 290     NtClose( hsubkey );
 291     NtClose( hkey );
 292
 293     if ( st == STATUS_SUCCESS )
 294         TRACE( "success\n" );
 295     else
 296     {
 297         WARN( "status trying to set ComputerName: %x\n", st );
 298         SetLastError ( RtlNtStatusToDosError ( st ) );
 299     }
 300 }
 301
 302
 303 /***********************************************************************
 304  *              GetComputerNameW         (KERNEL32.@)
 305  */
 306 BOOL WINAPI GetComputerNameW(LPWSTR name,LPDWORD size)
 307 {
 308     UNICODE_STRING nameW;
 309     OBJECT_ATTRIBUTES attr;
 310     HANDLE hkey = INVALID_HANDLE_VALUE, hsubkey = INVALID_HANDLE_VALUE;
 311     char buf[offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ) + (MAX_COMPUTERNAME_LENGTH + 1) * sizeof( WCHAR )];
 312     DWORD len = sizeof( buf );
 313     LPWSTR theName = (LPWSTR) (buf + offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data ));
 314     NTSTATUS st = STATUS_INVALID_PARAMETER;
 315
 316     TRACE ("%p %p\n", name, size);
 317
 318     _init_attr ( &attr, &nameW );
 319     RtlInitUnicodeString( &nameW, ComputerW );
 320     if ( ( st = NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 321         goto out;
 322
 323     attr.RootDirectory = hkey;
 324     RtlInitUnicodeString( &nameW, ActiveComputerNameW );
 325     if ( ( st = NtOpenKey( &hsubkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 326         goto out;
 327
 328     RtlInitUnicodeString( &nameW, ComputerNameW );
 329     if ( ( st = NtQueryValueKey( hsubkey, &nameW, KeyValuePartialInformation, buf, len, &len ) )
 330          != STATUS_SUCCESS )
 331         goto out;
 332
 333     len = (len -offsetof( KEY_VALUE_PARTIAL_INFORMATION, Data )) / sizeof (WCHAR) - 1;
 334     TRACE ("ComputerName is %s (length %u)\n", debugstr_w ( theName ), len);
 335
 336     __TRY
 337     {
 338         if ( *size < len )
 339         {
 340             memcpy ( name, theName, *size * sizeof (WCHAR) );
 341             name[*size] = 0;
 342             *size = len;
 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     __EXCEPT_PAGE_FAULT
 354     {
 355         st = STATUS_INVALID_PARAMETER;
 356     }
 357     __ENDTRY
 358
 359 out:
 360     NtClose ( hsubkey );
 361     NtClose ( hkey );
 362
 363     if ( st == STATUS_SUCCESS )
 364         return TRUE;
 365     else
 366     {
 367         SetLastError ( RtlNtStatusToDosError ( st ) );
 368         WARN ( "Status %u reading computer name from registry\n", st );
 369         return FALSE;
 370     }
 371 }
 372
 373 /***********************************************************************
 374  *              GetComputerNameA         (KERNEL32.@)
 375  */
 376 BOOL WINAPI GetComputerNameA(LPSTR name, LPDWORD size)
 377 {
 378     WCHAR nameW[ MAX_COMPUTERNAME_LENGTH + 1 ];
 379     DWORD sizeW = MAX_COMPUTERNAME_LENGTH;
 380     unsigned int len;
 381     BOOL ret;
 382
 383     if ( !GetComputerNameW (nameW, &sizeW) ) return FALSE;
 384
 385     len = WideCharToMultiByte ( CP_ACP, 0, nameW, sizeW, NULL, 0, NULL, 0 );
 386     __TRY
 387     {
 388         if ( *size < len )
 389         {
 390             WideCharToMultiByte ( CP_ACP, 0, nameW, sizeW, name, *size, NULL, 0 );
 391             name[*size] = 0;
 392             *size = len;
 393             SetLastError( ERROR_MORE_DATA );
 394             ret = FALSE;
 395         }
 396         else
 397         {
 398             WideCharToMultiByte ( CP_ACP, 0, nameW, sizeW, name, len, NULL, 0 );
 399             name[len] = 0;
 400             *size = len;
 401             ret = TRUE;
 402         }
 403     }
 404     __EXCEPT_PAGE_FAULT
 405     {
 406         SetLastError( ERROR_INVALID_PARAMETER );
 407         ret = FALSE;
 408     }
 409     __ENDTRY
 410
 411     return ret;
 412 }
 413
 414 /***********************************************************************
 415  *              GetComputerNameExA         (KERNEL32.@)
 416  */
 417 BOOL WINAPI GetComputerNameExA(COMPUTER_NAME_FORMAT type, LPSTR name, LPDWORD size)
 418 {
 419     char buf[256];
 420     int len = sizeof (buf), ret;
 421     TRACE("%d, %p, %p\n", type, name, size);
 422     switch( type )
 423     {
 424     case ComputerNameNetBIOS:
 425     case ComputerNamePhysicalNetBIOS:
 426         return GetComputerNameA (name, size);
 427     case ComputerNameDnsHostname:
 428     case ComputerNamePhysicalDnsHostname:
 429         ret = dns_hostname (buf, &len);
 430         break;
 431     case ComputerNameDnsDomain:
 432     case ComputerNamePhysicalDnsDomain:
 433         ret = dns_domainname (buf, &len);
 434         break;
 435     case ComputerNameDnsFullyQualified:
 436     case ComputerNamePhysicalDnsFullyQualified:
 437         ret = dns_fqdn (buf, &len);
 438         break;
 439     default:
 440         SetLastError (ERROR_INVALID_PARAMETER);
 441         return FALSE;
 442     }
 443
 444     if ( ret )
 445     {
 446         TRACE ("-> %s (%d)\n", debugstr_a (buf), len);
 447         __TRY
 448         {
 449             if ( *size < len )
 450             {
 451                 memcpy( name, buf, *size );
 452                 name[*size] = 0;
 453                 *size = len;
 454                 SetLastError( ERROR_MORE_DATA );
 455                 ret = FALSE;
 456             }
 457             else
 458             {
 459                 memcpy( name, buf, len );
 460                 name[len] = 0;
 461                 *size = len;
 462                 ret = TRUE;
 463             }
 464         }
 465         __EXCEPT_PAGE_FAULT
 466         {
 467             SetLastError( ERROR_INVALID_PARAMETER );
 468             return FALSE;
 469         }
 470         __ENDTRY
 471     }
 472
 473     return ret;
 474 }
 475
 476
 477 /***********************************************************************
 478  *              GetComputerNameExW         (KERNEL32.@)
 479  */
 480 BOOL WINAPI GetComputerNameExW( COMPUTER_NAME_FORMAT type, LPWSTR name, LPDWORD size )
 481 {
 482     char buf[256];
 483     int len = sizeof (buf), ret;
 484
 485     TRACE("%d, %p, %p\n", type, name, size);
 486     switch( type )
 487     {
 488     case ComputerNameNetBIOS:
 489     case ComputerNamePhysicalNetBIOS:
 490         return GetComputerNameW (name, size);
 491     case ComputerNameDnsHostname:
 492     case ComputerNamePhysicalDnsHostname:
 493         ret = dns_hostname (buf, &len);
 494         break;
 495     case ComputerNameDnsDomain:
 496     case ComputerNamePhysicalDnsDomain:
 497         ret = dns_domainname (buf, &len);
 498         break;
 499     case ComputerNameDnsFullyQualified:
 500     case ComputerNamePhysicalDnsFullyQualified:
 501         ret = dns_fqdn (buf, &len);
 502         break;
 503     default:
 504         SetLastError (ERROR_INVALID_PARAMETER);
 505         return FALSE;
 506     }
 507
 508     if ( ret )
 509     {
 510         TRACE ("-> %s (%d)\n", debugstr_a (buf), len);
 511         __TRY
 512         {
 513             unsigned int lenW = MultiByteToWideChar( CP_ACP, 0, buf, len, NULL, 0 );
 514             if ( *size < lenW )
 515             {
 516                 MultiByteToWideChar( CP_ACP, 0, buf, len, name, *size );
 517                 name[*size] = 0;
 518                 *size = lenW;
 519                 SetLastError( ERROR_MORE_DATA );
 520                 ret = FALSE;
 521             }
 522             else
 523             {
 524                 MultiByteToWideChar( CP_ACP, 0, buf, len, name, lenW );
 525                 name[lenW] = 0;
 526                 *size = lenW;
 527                 ret = TRUE;
 528             }
 529         }
 530         __EXCEPT_PAGE_FAULT
 531         {
 532             SetLastError( ERROR_INVALID_PARAMETER );
 533             return FALSE;
 534         }
 535         __ENDTRY
 536     }
 537
 538     return ret;
 539 }
 540
 541 /******************************************************************************
 542  * netbios_char (INTERNAL)
 543  */
 544 static WCHAR netbios_char ( WCHAR wc )
 545 {
 546     static const WCHAR special[] = {'!','@','#','$','%','^','&','\'',')','(','-','_','{','}','~'};
 547     static const WCHAR deflt = '_';
 548     unsigned int i;
 549
 550     if ( isalnumW ( wc ) ) return wc;
 551     for ( i = 0; i < sizeof (special) / sizeof (WCHAR); i++ )
 552         if ( wc == special[i] ) return wc;
 553     return deflt;
 554 }
 555
 556 /******************************************************************************
 557  * SetComputerNameW [KERNEL32.@]
 558  *
 559  * Set a new NetBIOS name for the local computer.
 560  *
 561  * PARAMS
 562  *    lpComputerName [I] Address of new computer name
 563  *
 564  * RETURNS
 565  *    Success: TRUE
 566  *    Failure: FALSE
 567  */
 568 BOOL WINAPI SetComputerNameW( LPCWSTR lpComputerName )
 569 {
 570     UNICODE_STRING nameW;
 571     OBJECT_ATTRIBUTES attr;
 572     HANDLE hkey = INVALID_HANDLE_VALUE, hsubkey = INVALID_HANDLE_VALUE;
 573     int plen = strlenW ( lpComputerName );
 574     int i;
 575     NTSTATUS st = STATUS_INTERNAL_ERROR;
 576
 577     if (get_use_dns_option())
 578     {
 579         /* This check isn't necessary, but may help debugging problems. */
 580         WARN( "Disabled by Wine Configuration.\n" );
 581         WARN( "Set \"UseDnsComputerName\" = \"N\" in category [Network] to enable.\n" );
 582         SetLastError ( ERROR_ACCESS_DENIED );
 583         return FALSE;
 584     }
 585
 586     TRACE( "%s\n", debugstr_w (lpComputerName) );
 587
 588     /* Check parameter */
 589     if ( plen > MAX_COMPUTERNAME_LENGTH )
 590         goto out;
 591
 592     /* This is NT behaviour. Win 95/98 would coerce characters. */
 593     for ( i = 0; i < plen; i++ )
 594     {
 595         WCHAR wc = lpComputerName[i];
 596         if ( wc != netbios_char( wc ) )
 597             goto out;
 598     }
 599
 600     _init_attr ( &attr, &nameW );
 601
 602     RtlInitUnicodeString (&nameW, ComputerW);
 603     if ( ( st = NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 604         goto out;
 605     attr.RootDirectory = hkey;
 606     RtlInitUnicodeString( &nameW, ComputerNameW );
 607     if ( ( st = NtOpenKey( &hsubkey, KEY_ALL_ACCESS, &attr ) ) != STATUS_SUCCESS )
 608         goto out;
 609     if ( ( st = NtSetValueKey( hsubkey, &nameW, 0, REG_SZ, lpComputerName, ( plen + 1) * sizeof(WCHAR) ) )
 610          != STATUS_SUCCESS )
 611         goto out;
 612
 613 out:
 614     NtClose( hsubkey );
 615     NtClose( hkey );
 616
 617     if ( st == STATUS_SUCCESS )
 618     {
 619         TRACE( "ComputerName changed\n" );
 620         return TRUE;
 621     }
 622
 623     else
 624     {
 625         SetLastError ( RtlNtStatusToDosError ( st ) );
 626         WARN ( "status %u\n", st );
 627         return FALSE;
 628     }
 629 }
 630
 631 /******************************************************************************
 632  * SetComputerNameA [KERNEL32.@]
 633  *
 634  * See SetComputerNameW.
 635  */
 636 BOOL WINAPI SetComputerNameA( LPCSTR lpComputerName )
 637 {
 638     BOOL ret;
 639     DWORD len = MultiByteToWideChar( CP_ACP, 0, lpComputerName, -1, NULL, 0 );
 640     LPWSTR nameW = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 641
 642     MultiByteToWideChar( CP_ACP, 0, lpComputerName, -1, nameW, len );
 643     ret = SetComputerNameW( nameW );
 644     HeapFree( GetProcessHeap(), 0, nameW );
 645     return ret;
 646 }
 647
 648 /******************************************************************************
 649  * SetComputerNameExW [KERNEL32.@]
 650  *
 651  */
 652 BOOL WINAPI SetComputerNameExW( COMPUTER_NAME_FORMAT type, LPCWSTR lpComputerName )
 653 {
 654     TRACE("%d, %s\n", type, debugstr_w (lpComputerName));
 655     switch( type )
 656     {
 657     case ComputerNameNetBIOS:
 658     case ComputerNamePhysicalNetBIOS:
 659         return SetComputerNameW( lpComputerName );
 660     default:
 661         SetLastError( ERROR_ACCESS_DENIED );
 662         return FALSE;
 663     }
 664 }
 665
 666 /******************************************************************************
 667  * SetComputerNameExA [KERNEL32.@]
 668  *
 669  */
 670 BOOL WINAPI SetComputerNameExA( COMPUTER_NAME_FORMAT type, LPCSTR lpComputerName )
 671 {
 672     TRACE( "%d, %s\n", type, debugstr_a (lpComputerName) );
 673     switch( type )
 674     {
 675     case ComputerNameNetBIOS:
 676     case ComputerNamePhysicalNetBIOS:
 677         return SetComputerNameA( lpComputerName );
 678     default:
 679         SetLastError( ERROR_ACCESS_DENIED );
 680         return FALSE;
 681     }
 682 }
 683
 684 /***********************************************************************
 685  *              DnsHostnameToComputerNameA         (KERNEL32.@)
 686  */
 687 BOOL WINAPI DnsHostnameToComputerNameA(LPCSTR hostname,
 688     LPSTR computername, LPDWORD size)
 689 {
 690     DWORD len;
 691
 692     FIXME("(%s, %p, %p): stub\n", debugstr_a(hostname), computername, size);
 693
 694     if (!hostname || !size) return FALSE;
 695     len = lstrlenA(hostname);
 696
 697     if (len > MAX_COMPUTERNAME_LENGTH)
 698         len = MAX_COMPUTERNAME_LENGTH;
 699
 700     if (*size < len)
 701     {
 702         *size = len;
 703         return FALSE;
 704     }
 705     if (!computername) return FALSE;
 706
 707     memcpy( computername, hostname, len );
 708     computername[len + 1] = 0;
 709     return TRUE;
 710 }
 711
 712 /***********************************************************************
 713  *              DnsHostnameToComputerNameW         (KERNEL32.@)
 714  */
 715 BOOL WINAPI DnsHostnameToComputerNameW(LPCWSTR hostname,
 716     LPWSTR computername, LPDWORD size)
 717 {
 718     DWORD len;
 719
 720     FIXME("(%s, %p, %p): stub\n", debugstr_w(hostname), computername, size);
 721
 722     if (!hostname || !size) return FALSE;
 723     len = lstrlenW(hostname);
 724
 725     if (len > MAX_COMPUTERNAME_LENGTH)
 726         len = MAX_COMPUTERNAME_LENGTH;
 727
 728     if (*size < len)
 729     {
 730         *size = len;
 731         return FALSE;
 732     }
 733     if (!computername) return FALSE;
 734
 735     memcpy( computername, hostname, len * sizeof(WCHAR) );
 736     computername[len + 1] = 0;
 737     return TRUE;
 738 }