dlls/ntdll/env.c

   1 /*
   2  * Ntdll environment functions
   3  *
   4  * Copyright 1996, 1998 Alexandre Julliard
   5  * Copyright 2003       Eric Pouech
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21 #include "config.h"
  22
  23 #include <assert.h>
  24 #include <stdarg.h>
  25
  26 #include "ntstatus.h"
  27 #define WIN32_NO_STATUS
  28 #include "windef.h"
  29 #include "winternl.h"
  30 #include "wine/unicode.h"
  31 #include "wine/debug.h"
  32 #include "ntdll_misc.h"
  33 #include "winnt.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(environ);
  36
  37 /******************************************************************************
  38  *  NtQuerySystemEnvironmentValue               [NTDLL.@]
  39  */
  40 NTSYSAPI NTSTATUS WINAPI NtQuerySystemEnvironmentValue(PUNICODE_STRING VariableName,
  41                                                        PWCHAR Value,
  42                                                        ULONG ValueBufferLength,
  43                                                        PULONG RequiredLength)
  44 {
  45     FIXME("(%s, %p, %u, %p), stub\n", debugstr_us(VariableName), Value, ValueBufferLength, RequiredLength);
  46     return STATUS_NOT_IMPLEMENTED;
  47 }
  48
  49 /******************************************************************************
  50  *  NtQuerySystemEnvironmentValueEx             [NTDLL.@]
  51  */
  52 NTSYSAPI NTSTATUS WINAPI NtQuerySystemEnvironmentValueEx(PUNICODE_STRING name, LPGUID vendor,
  53                                                          PVOID value, PULONG retlength, PULONG attrib)
  54 {
  55     FIXME("(%s, %s, %p, %p, %p), stub\n", debugstr_us(name), debugstr_guid(vendor), value, retlength, attrib);
  56     return STATUS_NOT_IMPLEMENTED;
  57 }
  58
  59 /******************************************************************************
  60  *  RtlCreateEnvironment                [NTDLL.@]
  61  */
  62 NTSTATUS WINAPI RtlCreateEnvironment(BOOLEAN inherit, PWSTR* env)
  63 {
  64     NTSTATUS    nts;
  65
  66     TRACE("(%u,%p)!\n", inherit, env);
  67
  68     if (inherit)
  69     {
  70         MEMORY_BASIC_INFORMATION        mbi;
  71
  72         RtlAcquirePebLock();
  73
  74         nts = NtQueryVirtualMemory(NtCurrentProcess(),
  75                                    NtCurrentTeb()->Peb->ProcessParameters->Environment,
  76                                    0, &mbi, sizeof(mbi), NULL);
  77         if (nts == STATUS_SUCCESS)
  78         {
  79             *env = NULL;
  80             nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)env, 0, &mbi.RegionSize,
  81                                           MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
  82             if (nts == STATUS_SUCCESS)
  83                 memcpy(*env, NtCurrentTeb()->Peb->ProcessParameters->Environment, mbi.RegionSize);
  84             else *env = NULL;
  85         }
  86         RtlReleasePebLock();
  87     }
  88     else
  89     {
  90         SIZE_T      size = 1;
  91         PVOID       addr = NULL;
  92         nts = NtAllocateVirtualMemory(NtCurrentProcess(), &addr, 0, &size,
  93                                       MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
  94         if (nts == STATUS_SUCCESS) *env = addr;
  95     }
  96
  97     return nts;
  98 }
  99
 100 /******************************************************************************
 101  *  RtlDestroyEnvironment               [NTDLL.@]
 102  */
 103 NTSTATUS WINAPI RtlDestroyEnvironment(PWSTR env)
 104 {
 105     SIZE_T size = 0;
 106
 107     TRACE("(%p)!\n", env);
 108
 109     return NtFreeVirtualMemory(NtCurrentProcess(), (void**)&env, &size, MEM_RELEASE);
 110 }
 111
 112 static LPCWSTR ENV_FindVariable(PCWSTR var, PCWSTR name, unsigned namelen)
 113 {
 114     for (; *var; var += strlenW(var) + 1)
 115     {
 116         /* match var names, but avoid setting a var with a name including a '='
 117          * (a starting '=' is valid though)
 118          */
 119         if (strncmpiW(var, name, namelen) == 0 && var[namelen] == '=' &&
 120             strchrW(var + 1, '=') == var + namelen)
 121         {
 122             return var + namelen + 1;
 123         }
 124     }
 125     return NULL;
 126 }
 127
 128 /******************************************************************
 129  *              RtlQueryEnvironmentVariable_U   [NTDLL.@]
 130  *
 131  * NOTES: when the buffer is too small, the string is not written, but if the
 132  *      terminating null char is the only char that cannot be written, then
 133  *      all chars (except the null) are written and success is returned
 134  *      (behavior of Win2k at least)
 135  */
 136 NTSTATUS WINAPI RtlQueryEnvironmentVariable_U(PWSTR env,
 137                                               PUNICODE_STRING name,
 138                                               PUNICODE_STRING value)
 139 {
 140     NTSTATUS    nts = STATUS_VARIABLE_NOT_FOUND;
 141     PCWSTR      var;
 142     unsigned    namelen;
 143
 144     TRACE("%p %s %p\n", env, debugstr_us(name), value);
 145
 146     value->Length = 0;
 147     namelen = name->Length / sizeof(WCHAR);
 148     if (!namelen) return nts;
 149
 150     if (!env)
 151     {
 152         RtlAcquirePebLock();
 153         var = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 154     }
 155     else var = env;
 156
 157     var = ENV_FindVariable(var, name->Buffer, namelen);
 158     if (var != NULL)
 159     {
 160         value->Length = strlenW(var) * sizeof(WCHAR);
 161
 162         if (value->Length <= value->MaximumLength)
 163         {
 164             memmove(value->Buffer, var, min(value->Length + sizeof(WCHAR), value->MaximumLength));
 165             nts = STATUS_SUCCESS;
 166         }
 167         else nts = STATUS_BUFFER_TOO_SMALL;
 168     }
 169
 170     if (!env) RtlReleasePebLock();
 171
 172     return nts;
 173 }
 174
 175 /******************************************************************
 176  *              RtlSetCurrentEnvironment        [NTDLL.@]
 177  *
 178  */
 179 void WINAPI RtlSetCurrentEnvironment(PWSTR new_env, PWSTR* old_env)
 180 {
 181     TRACE("(%p %p)\n", new_env, old_env);
 182
 183     RtlAcquirePebLock();
 184
 185     if (old_env) *old_env = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 186     NtCurrentTeb()->Peb->ProcessParameters->Environment = new_env;
 187
 188     RtlReleasePebLock();
 189 }
 190
 191
 192 /******************************************************************************
 193  *  RtlSetEnvironmentVariable           [NTDLL.@]
 194  */
 195 NTSTATUS WINAPI RtlSetEnvironmentVariable(PWSTR* penv, PUNICODE_STRING name,
 196                                           PUNICODE_STRING value)
 197 {
 198     INT         len, old_size;
 199     LPWSTR      p, env;
 200     NTSTATUS    nts = STATUS_VARIABLE_NOT_FOUND;
 201     MEMORY_BASIC_INFORMATION mbi;
 202
 203     TRACE("(%p, %s, %s)\n", penv, debugstr_us(name), debugstr_us(value));
 204
 205     if (!name || !name->Buffer || !name->Length)
 206         return STATUS_INVALID_PARAMETER_1;
 207
 208     len = name->Length / sizeof(WCHAR);
 209
 210     /* variable names can't contain a '=' except as a first character */
 211     for (p = name->Buffer + 1; p < name->Buffer + len; p++)
 212         if (*p == '=') return STATUS_INVALID_PARAMETER;
 213
 214     if (!penv)
 215     {
 216         RtlAcquirePebLock();
 217         env = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 218     } else env = *penv;
 219
 220     /* compute current size of environment */
 221     for (p = env; *p; p += strlenW(p) + 1);
 222     old_size = p + 1 - env;
 223
 224     /* Find a place to insert the string */
 225     for (p = env; *p; p += strlenW(p) + 1)
 226     {
 227         if (!strncmpiW(name->Buffer, p, len) && (p[len] == '=')) break;
 228     }
 229     if (!value && !*p) goto done;  /* Value to remove doesn't exist */
 230
 231     /* Realloc the buffer */
 232     len = value ? len + value->Length / sizeof(WCHAR) + 2 : 0;
 233     if (*p) len -= strlenW(p) + 1;  /* The name already exists */
 234
 235     if (len < 0)
 236     {
 237         LPWSTR next = p + strlenW(p) + 1;  /* We know there is a next one */
 238         memmove(next + len, next, (old_size - (next - env)) * sizeof(WCHAR));
 239     }
 240
 241     nts = NtQueryVirtualMemory(NtCurrentProcess(), env, 0,
 242                                &mbi, sizeof(mbi), NULL);
 243     if (nts != STATUS_SUCCESS) goto done;
 244
 245     if ((old_size + len) * sizeof(WCHAR) > mbi.RegionSize)
 246     {
 247         LPWSTR  new_env;
 248         SIZE_T  new_size = (old_size + len) * sizeof(WCHAR);
 249
 250         new_env = NULL;
 251         nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)&new_env, 0,
 252                                       &new_size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 253         if (nts != STATUS_SUCCESS) goto done;
 254
 255         memmove(new_env, env, (p - env) * sizeof(WCHAR));
 256         assert(len > 0);
 257         memmove(new_env + (p - env) + len, p, (old_size - (p - env)) * sizeof(WCHAR));
 258         p = new_env + (p - env);
 259
 260         RtlDestroyEnvironment(env);
 261         if (!penv) NtCurrentTeb()->Peb->ProcessParameters->Environment = new_env;
 262         else *penv = new_env;
 263     }
 264     else
 265     {
 266         if (len > 0) memmove(p + len, p, (old_size - (p - env)) * sizeof(WCHAR));
 267     }
 268
 269     /* Set the new string */
 270     if (value)
 271     {
 272         memcpy( p, name->Buffer, name->Length );
 273         p += name->Length / sizeof(WCHAR);
 274         *p++ = '=';
 275         memcpy( p, value->Buffer, value->Length );
 276         p[value->Length / sizeof(WCHAR)] = 0;
 277     }
 278 done:
 279     if (!penv) RtlReleasePebLock();
 280
 281     return nts;
 282 }
 283
 284 /******************************************************************
 285  *              RtlExpandEnvironmentStrings_U (NTDLL.@)
 286  *
 287  */
 288 NTSTATUS WINAPI RtlExpandEnvironmentStrings_U(PCWSTR renv, const UNICODE_STRING* us_src,
 289                                               PUNICODE_STRING us_dst, PULONG plen)
 290 {
 291     DWORD src_len, len, count, total_size = 1;  /* 1 for terminating '\0' */
 292     LPCWSTR     env, src, p, var;
 293     LPWSTR      dst;
 294
 295     src = us_src->Buffer;
 296     src_len = us_src->Length / sizeof(WCHAR);
 297     count = us_dst->MaximumLength / sizeof(WCHAR);
 298     dst = count ? us_dst->Buffer : NULL;
 299
 300     if (!renv)
 301     {
 302         RtlAcquirePebLock();
 303         env = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 304     }
 305     else env = renv;
 306
 307     while (src_len)
 308     {
 309         if (*src != '%')
 310         {
 311             if ((p = memchrW( src, '%', src_len ))) len = p - src;
 312             else len = src_len;
 313             var = src;
 314             src += len;
 315             src_len -= len;
 316         }
 317         else  /* we are at the start of a variable */
 318         {
 319             if ((p = memchrW( src + 1, '%', src_len - 1 )))
 320             {
 321                 len = p - src - 1;  /* Length of the variable name */
 322                 if ((var = ENV_FindVariable( env, src + 1, len )))
 323                 {
 324                     src += len + 2;  /* Skip the variable name */
 325                     src_len -= len + 2;
 326                     len = strlenW(var);
 327                 }
 328                 else
 329                 {
 330                     var = src;  /* Copy original name instead */
 331                     len += 2;
 332                     src += len;
 333                     src_len -= len;
 334                 }
 335             }
 336             else  /* unfinished variable name, ignore it */
 337             {
 338                 var = src;
 339                 len = src_len;  /* Copy whole string */
 340                 src += len;
 341                 src_len = 0;
 342             }
 343         }
 344         total_size += len;
 345         if (dst)
 346         {
 347             if (count < len) len = count;
 348             memcpy(dst, var, len * sizeof(WCHAR));
 349             count -= len;
 350             dst += len;
 351         }
 352     }
 353
 354     if (!renv) RtlReleasePebLock();
 355
 356     /* Null-terminate the string */
 357     if (dst && count) *dst = '\0';
 358
 359     us_dst->Length = (dst) ? (dst - us_dst->Buffer) * sizeof(WCHAR) : 0;
 360     if (plen) *plen = total_size * sizeof(WCHAR);
 361
 362     return (count) ? STATUS_SUCCESS : STATUS_BUFFER_TOO_SMALL;
 363 }
 364
 365
 366 static inline void normalize( void *base, WCHAR **ptr )
 367 {
 368     if (*ptr) *ptr = (WCHAR *)((char *)base + (UINT_PTR)*ptr);
 369 }
 370
 371 /******************************************************************************
 372  *  RtlNormalizeProcessParams  [NTDLL.@]
 373  */
 374 PRTL_USER_PROCESS_PARAMETERS WINAPI RtlNormalizeProcessParams( RTL_USER_PROCESS_PARAMETERS *params )
 375 {
 376     if (params && !(params->Flags & PROCESS_PARAMS_FLAG_NORMALIZED))
 377     {
 378         normalize( params, &params->CurrentDirectory.DosPath.Buffer );
 379         normalize( params, &params->DllPath.Buffer );
 380         normalize( params, &params->ImagePathName.Buffer );
 381         normalize( params, &params->CommandLine.Buffer );
 382         normalize( params, &params->WindowTitle.Buffer );
 383         normalize( params, &params->Desktop.Buffer );
 384         normalize( params, &params->ShellInfo.Buffer );
 385         normalize( params, &params->RuntimeInfo.Buffer );
 386         params->Flags |= PROCESS_PARAMS_FLAG_NORMALIZED;
 387     }
 388     return params;
 389 }
 390
 391
 392 static inline void denormalize( const void *base, WCHAR **ptr )
 393 {
 394     if (*ptr) *ptr = (WCHAR *)(UINT_PTR)((char *)*ptr - (const char *)base);
 395 }
 396
 397 /******************************************************************************
 398  *  RtlDeNormalizeProcessParams  [NTDLL.@]
 399  */
 400 PRTL_USER_PROCESS_PARAMETERS WINAPI RtlDeNormalizeProcessParams( RTL_USER_PROCESS_PARAMETERS *params )
 401 {
 402     if (params && (params->Flags & PROCESS_PARAMS_FLAG_NORMALIZED))
 403     {
 404         denormalize( params, &params->CurrentDirectory.DosPath.Buffer );
 405         denormalize( params, &params->DllPath.Buffer );
 406         denormalize( params, &params->ImagePathName.Buffer );
 407         denormalize( params, &params->CommandLine.Buffer );
 408         denormalize( params, &params->WindowTitle.Buffer );
 409         denormalize( params, &params->Desktop.Buffer );
 410         denormalize( params, &params->ShellInfo.Buffer );
 411         denormalize( params, &params->RuntimeInfo.Buffer );
 412         params->Flags &= ~PROCESS_PARAMS_FLAG_NORMALIZED;
 413     }
 414     return params;
 415 }
 416
 417
 418 /* append a unicode string to the process params data; helper for RtlCreateProcessParameters */
 419 static void append_unicode_string( void **data, const UNICODE_STRING *src,
 420                                    UNICODE_STRING *dst )
 421 {
 422     dst->Length = src->Length;
 423     dst->MaximumLength = src->MaximumLength;
 424     dst->Buffer = *data;
 425     memcpy( dst->Buffer, src->Buffer, dst->MaximumLength );
 426     *data = (char *)dst->Buffer + dst->MaximumLength;
 427 }
 428
 429
 430 /******************************************************************************
 431  *  RtlCreateProcessParameters  [NTDLL.@]
 432  */
 433 NTSTATUS WINAPI RtlCreateProcessParameters( RTL_USER_PROCESS_PARAMETERS **result,
 434                                             const UNICODE_STRING *ImagePathName,
 435                                             const UNICODE_STRING *DllPath,
 436                                             const UNICODE_STRING *CurrentDirectoryName,
 437                                             const UNICODE_STRING *CommandLine,
 438                                             PWSTR Environment,
 439                                             const UNICODE_STRING *WindowTitle,
 440                                             const UNICODE_STRING *Desktop,
 441                                             const UNICODE_STRING *ShellInfo,
 442                                             const UNICODE_STRING *RuntimeInfo )
 443 {
 444     static WCHAR empty[] = {0};
 445     static const UNICODE_STRING empty_str = { 0, sizeof(empty), empty };
 446     static const UNICODE_STRING null_str = { 0, 0, NULL };
 447
 448     const RTL_USER_PROCESS_PARAMETERS *cur_params;
 449     SIZE_T size, total_size;
 450     void *ptr;
 451     NTSTATUS status;
 452
 453     RtlAcquirePebLock();
 454     cur_params = NtCurrentTeb()->Peb->ProcessParameters;
 455     if (!DllPath) DllPath = &cur_params->DllPath;
 456     if (!CurrentDirectoryName)
 457     {
 458         if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 459             CurrentDirectoryName = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 460         else
 461             CurrentDirectoryName = &cur_params->CurrentDirectory.DosPath;
 462     }
 463     if (!CommandLine) CommandLine = ImagePathName;
 464     if (!Environment) Environment = cur_params->Environment;
 465     if (!WindowTitle) WindowTitle = &empty_str;
 466     if (!Desktop) Desktop = &empty_str;
 467     if (!ShellInfo) ShellInfo = &empty_str;
 468     if (!RuntimeInfo) RuntimeInfo = &null_str;
 469
 470     size = (sizeof(RTL_USER_PROCESS_PARAMETERS)
 471             + ImagePathName->MaximumLength
 472             + DllPath->MaximumLength
 473             + CurrentDirectoryName->MaximumLength
 474             + CommandLine->MaximumLength
 475             + WindowTitle->MaximumLength
 476             + Desktop->MaximumLength
 477             + ShellInfo->MaximumLength
 478             + RuntimeInfo->MaximumLength);
 479
 480     total_size = size;
 481     ptr = NULL;
 482     if ((status = NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, 0, &total_size,
 483                                            MEM_COMMIT, PAGE_READWRITE )) == STATUS_SUCCESS)
 484     {
 485         RTL_USER_PROCESS_PARAMETERS *params = ptr;
 486         params->AllocationSize = total_size;
 487         params->Size           = size;
 488         params->Flags          = PROCESS_PARAMS_FLAG_NORMALIZED;
 489         params->ConsoleFlags   = cur_params->ConsoleFlags;
 490         params->Environment    = Environment;
 491         /* all other fields are zero */
 492
 493         ptr = params + 1;
 494         append_unicode_string( &ptr, CurrentDirectoryName, &params->CurrentDirectory.DosPath );
 495         append_unicode_string( &ptr, DllPath, &params->DllPath );
 496         append_unicode_string( &ptr, ImagePathName, &params->ImagePathName );
 497         append_unicode_string( &ptr, CommandLine, &params->CommandLine );
 498         append_unicode_string( &ptr, WindowTitle, &params->WindowTitle );
 499         append_unicode_string( &ptr, Desktop, &params->Desktop );
 500         append_unicode_string( &ptr, ShellInfo, &params->ShellInfo );
 501         append_unicode_string( &ptr, RuntimeInfo, &params->RuntimeInfo );
 502         *result = RtlDeNormalizeProcessParams( params );
 503     }
 504     RtlReleasePebLock();
 505     return status;
 506 }
 507
 508
 509 /******************************************************************************
 510  *  RtlDestroyProcessParameters  [NTDLL.@]
 511  */
 512 void WINAPI RtlDestroyProcessParameters( RTL_USER_PROCESS_PARAMETERS *params )
 513 {
 514     void *ptr = params;
 515     SIZE_T size = 0;
 516     NtFreeVirtualMemory( NtCurrentProcess(), &ptr, &size, MEM_RELEASE );
 517 }