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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include "config.h"
  22
  23 #include <assert.h>
  24 #include <stdarg.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winreg.h"
  29 #include "winternl.h"
  30 #include "wine/unicode.h"
  31 #include "wine/debug.h"
  32 #include "ntdll_misc.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(environ);
  35
  36 /******************************************************************************
  37  *  RtlCreateEnvironment                [NTDLL.@]
  38  */
  39 NTSTATUS WINAPI RtlCreateEnvironment(BOOLEAN inherit, PWSTR* env)
  40 {
  41     NTSTATUS    nts;
  42
  43     TRACE("(%u,%p)!\n", inherit, env);
  44
  45     if (inherit)
  46     {
  47         MEMORY_BASIC_INFORMATION        mbi;
  48
  49         RtlAcquirePebLock();
  50
  51         nts = NtQueryVirtualMemory(NtCurrentProcess(),
  52                                    NtCurrentTeb()->Peb->ProcessParameters->Environment,
  53                                    0, &mbi, sizeof(mbi), NULL);
  54         if (nts == STATUS_SUCCESS)
  55         {
  56             *env = NULL;
  57             nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)env, 0, &mbi.RegionSize,
  58                                           MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
  59             if (nts == STATUS_SUCCESS)
  60                 memcpy(*env, NtCurrentTeb()->Peb->ProcessParameters->Environment, mbi.RegionSize);
  61             else *env = NULL;
  62         }
  63         RtlReleasePebLock();
  64     }
  65     else
  66     {
  67         ULONG       size = 1;
  68         nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)env, 0, &size,
  69                                       MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
  70         if (nts == STATUS_SUCCESS)
  71             memset(*env, 0, size);
  72     }
  73
  74     return nts;
  75 }
  76
  77 /******************************************************************************
  78  *  RtlDestroyEnvironment               [NTDLL.@]
  79  */
  80 NTSTATUS WINAPI RtlDestroyEnvironment(PWSTR env)
  81 {
  82     ULONG size = 0;
  83
  84     TRACE("(%p)!\n", env);
  85
  86     return NtFreeVirtualMemory(NtCurrentProcess(), (void**)&env, &size, MEM_RELEASE);
  87 }
  88
  89 static LPCWSTR ENV_FindVariable(PCWSTR var, PCWSTR name, unsigned namelen)
  90 {
  91     for (; *var; var += strlenW(var) + 1)
  92     {
  93         /* match var names, but avoid setting a var with a name including a '='
  94          * (a starting '=' is valid though)
  95          */
  96         if (strncmpiW(var, name, namelen) == 0 && var[namelen] == '=' &&
  97             strchrW(var + 1, '=') == var + namelen)
  98         {
  99             return var + namelen + 1;
 100         }
 101     }
 102     return NULL;
 103 }
 104
 105 /******************************************************************
 106  *              RtlQueryEnvironmentVariable_U   [NTDLL.@]
 107  *
 108  * NOTES: when the buffer is too small, the string is not written, but if the
 109  *      terminating null char is the only char that cannot be written, then
 110  *      all chars (except the null) are written and success is returned
 111  *      (behavior of Win2k at least)
 112  */
 113 NTSTATUS WINAPI RtlQueryEnvironmentVariable_U(PWSTR env,
 114                                               PUNICODE_STRING name,
 115                                               PUNICODE_STRING value)
 116 {
 117     NTSTATUS    nts = STATUS_VARIABLE_NOT_FOUND;
 118     PCWSTR      var;
 119     unsigned    namelen;
 120
 121     TRACE("%s %s %p\n", debugstr_w(env), debugstr_w(name->Buffer), value);
 122
 123     value->Length = 0;
 124     namelen = name->Length / sizeof(WCHAR);
 125     if (!namelen) return nts;
 126
 127     if (!env)
 128     {
 129         RtlAcquirePebLock();
 130         var = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 131     }
 132     else var = env;
 133
 134     var = ENV_FindVariable(var, name->Buffer, namelen);
 135     if (var != NULL)
 136     {
 137         value->Length = strlenW(var) * sizeof(WCHAR);
 138
 139         if (value->Length <= value->MaximumLength)
 140         {
 141             memmove(value->Buffer, var, min(value->Length + sizeof(WCHAR), value->MaximumLength));
 142             nts = STATUS_SUCCESS;
 143         }
 144         else nts = STATUS_BUFFER_TOO_SMALL;
 145     }
 146
 147     if (!env) RtlReleasePebLock();
 148
 149     return nts;
 150 }
 151
 152 /******************************************************************
 153  *              RtlSetCurrentEnvironment        [NTDLL.@]
 154  *
 155  */
 156 void WINAPI RtlSetCurrentEnvironment(PWSTR new_env, PWSTR* old_env)
 157 {
 158     TRACE("(%p %p)\n", new_env, old_env);
 159
 160     RtlAcquirePebLock();
 161
 162     if (old_env) *old_env = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 163     NtCurrentTeb()->Peb->ProcessParameters->Environment = new_env;
 164
 165     RtlReleasePebLock();
 166 }
 167
 168
 169 /******************************************************************************
 170  *  RtlSetEnvironmentVariable           [NTDLL.@]
 171  */
 172 NTSTATUS WINAPI RtlSetEnvironmentVariable(PWSTR* penv, PUNICODE_STRING name,
 173                                           PUNICODE_STRING value)
 174 {
 175     INT         len, old_size;
 176     LPWSTR      p, env;
 177     NTSTATUS    nts = STATUS_VARIABLE_NOT_FOUND;
 178     MEMORY_BASIC_INFORMATION mbi;
 179
 180     TRACE("(%p,%s,%s)\n",
 181           penv, debugstr_w(name->Buffer),
 182           value ? debugstr_w(value->Buffer) : "--nil--");
 183
 184     if (!name || !name->Buffer || !name->Buffer[0])
 185         return STATUS_INVALID_PARAMETER_1;
 186     /* variable names can't contain a '=' except as a first character */
 187     if (strchrW(name->Buffer + 1, '=')) return STATUS_INVALID_PARAMETER;
 188
 189     if (!penv)
 190     {
 191         RtlAcquirePebLock();
 192         env = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 193     } else env = *penv;
 194
 195     len = name->Length / sizeof(WCHAR);
 196
 197     /* compute current size of environment */
 198     for (p = env; *p; p += strlenW(p) + 1);
 199     old_size = p + 1 - env;
 200
 201     /* Find a place to insert the string */
 202     for (p = env; *p; p += strlenW(p) + 1)
 203     {
 204         if (!strncmpiW(name->Buffer, p, len) && (p[len] == '=')) break;
 205     }
 206     if (!value && !*p) goto done;  /* Value to remove doesn't exist */
 207
 208     /* Realloc the buffer */
 209     len = value ? len + value->Length / sizeof(WCHAR) + 2 : 0;
 210     if (*p) len -= strlenW(p) + 1;  /* The name already exists */
 211
 212     if (len < 0)
 213     {
 214         LPWSTR next = p + strlenW(p) + 1;  /* We know there is a next one */
 215         memmove(next + len, next, (old_size - (next - env)) * sizeof(WCHAR));
 216     }
 217
 218     nts = NtQueryVirtualMemory(NtCurrentProcess(), env, 0,
 219                                &mbi, sizeof(mbi), NULL);
 220     if (nts != STATUS_SUCCESS) goto done;
 221
 222     if ((old_size + len) * sizeof(WCHAR) > mbi.RegionSize)
 223     {
 224         LPWSTR  new_env;
 225         ULONG   new_size = (old_size + len) * sizeof(WCHAR);
 226
 227         new_env = NULL;
 228         nts = NtAllocateVirtualMemory(NtCurrentProcess(), (void**)&new_env, 0,
 229                                       &new_size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 230         if (nts != STATUS_SUCCESS) goto done;
 231
 232         memmove(new_env, env, (p - env) * sizeof(WCHAR));
 233         assert(len > 0);
 234         memmove(new_env + (p - env) + len, p, (old_size - (p - env)) * sizeof(WCHAR));
 235         p = new_env + (p - env);
 236
 237         RtlDestroyEnvironment(env);
 238         if (!penv) NtCurrentTeb()->Peb->ProcessParameters->Environment = new_env;
 239         else *penv = new_env;
 240         env = new_env;
 241     }
 242     else
 243     {
 244         if (len > 0) memmove(p + len, p, (old_size - (p - env)) * sizeof(WCHAR));
 245     }
 246
 247     /* Set the new string */
 248     if (value)
 249     {
 250         static const WCHAR equalW[] = {'=',0};
 251
 252         strcpyW(p, name->Buffer);
 253         strcatW(p, equalW);
 254         strcatW(p, value->Buffer);
 255     }
 256 done:
 257     if (!penv) RtlReleasePebLock();
 258
 259     return nts;
 260 }
 261
 262 /******************************************************************
 263  *              RtlExpandEnvironmentStrings_U (NTDLL.@)
 264  *
 265  */
 266 NTSTATUS WINAPI RtlExpandEnvironmentStrings_U(PWSTR renv, const UNICODE_STRING* us_src,
 267                                               PUNICODE_STRING us_dst, PULONG plen)
 268 {
 269     DWORD       len, count, total_size = 1;  /* 1 for terminating '\0' */
 270     LPCWSTR     env, src, p, var;
 271     LPWSTR      dst;
 272
 273     src = us_src->Buffer;
 274     count = us_dst->MaximumLength / sizeof(WCHAR);
 275     dst = count ? us_dst->Buffer : NULL;
 276
 277     if (!renv)
 278     {
 279         RtlAcquirePebLock();
 280         env = NtCurrentTeb()->Peb->ProcessParameters->Environment;
 281     }
 282     else env = renv;
 283
 284     while (*src)
 285     {
 286         if (*src != '%')
 287         {
 288             if ((p = strchrW( src, '%' ))) len = p - src;
 289             else len = strlenW(src);
 290             var = src;
 291             src += len;
 292         }
 293         else  /* we are at the start of a variable */
 294         {
 295             if ((p = strchrW( src + 1, '%' )))
 296             {
 297                 len = p - src - 1;  /* Length of the variable name */
 298                 if ((var = ENV_FindVariable( env, src + 1, len )))
 299                 {
 300                     src += len + 2;  /* Skip the variable name */
 301                     len = strlenW(var);
 302                 }
 303                 else
 304                 {
 305                     var = src;  /* Copy original name instead */
 306                     len += 2;
 307                     src += len;
 308                 }
 309             }
 310             else  /* unfinished variable name, ignore it */
 311             {
 312                 var = src;
 313                 len = strlenW(src);  /* Copy whole string */
 314                 src += len;
 315             }
 316         }
 317         total_size += len;
 318         if (dst)
 319         {
 320             if (count < len) len = count;
 321             memcpy(dst, var, len * sizeof(WCHAR));
 322             count -= len;
 323             dst += len;
 324         }
 325     }
 326
 327     if (!renv) RtlReleasePebLock();
 328
 329     /* Null-terminate the string */
 330     if (dst && count) *dst = '\0';
 331
 332     us_dst->Length = (dst) ? (dst - us_dst->Buffer) * sizeof(WCHAR) : 0;
 333     if (plen) *plen = total_size * sizeof(WCHAR);
 334
 335     return (count) ? STATUS_SUCCESS : STATUS_BUFFER_TOO_SMALL;
 336 }
 337
 338
 339 static inline void normalize( void *base, WCHAR **ptr )
 340 {
 341     if (*ptr) *ptr = (WCHAR *)((char *)base + (UINT_PTR)*ptr);
 342 }
 343
 344 /******************************************************************************
 345  *  RtlNormalizeProcessParams  [NTDLL.@]
 346  */
 347 PRTL_USER_PROCESS_PARAMETERS WINAPI RtlNormalizeProcessParams( RTL_USER_PROCESS_PARAMETERS *params )
 348 {
 349     if (params && !(params->Flags & PROCESS_PARAMS_FLAG_NORMALIZED))
 350     {
 351         normalize( params, &params->CurrentDirectoryName.Buffer );
 352         normalize( params, &params->DllPath.Buffer );
 353         normalize( params, &params->ImagePathName.Buffer );
 354         normalize( params, &params->CommandLine.Buffer );
 355         normalize( params, &params->WindowTitle.Buffer );
 356         normalize( params, &params->Desktop.Buffer );
 357         normalize( params, &params->ShellInfo.Buffer );
 358         normalize( params, &params->RuntimeInfo.Buffer );
 359         params->Flags |= PROCESS_PARAMS_FLAG_NORMALIZED;
 360     }
 361     return params;
 362 }
 363
 364
 365 static inline void denormalize( void *base, WCHAR **ptr )
 366 {
 367     if (*ptr) *ptr = (WCHAR *)(UINT_PTR)((char *)*ptr - (char *)base);
 368 }
 369
 370 /******************************************************************************
 371  *  RtlDeNormalizeProcessParams  [NTDLL.@]
 372  */
 373 PRTL_USER_PROCESS_PARAMETERS WINAPI RtlDeNormalizeProcessParams( RTL_USER_PROCESS_PARAMETERS *params )
 374 {
 375     if (params && (params->Flags & PROCESS_PARAMS_FLAG_NORMALIZED))
 376     {
 377         denormalize( params, &params->CurrentDirectoryName.Buffer );
 378         denormalize( params, &params->DllPath.Buffer );
 379         denormalize( params, &params->ImagePathName.Buffer );
 380         denormalize( params, &params->CommandLine.Buffer );
 381         denormalize( params, &params->WindowTitle.Buffer );
 382         denormalize( params, &params->Desktop.Buffer );
 383         denormalize( params, &params->ShellInfo.Buffer );
 384         denormalize( params, &params->RuntimeInfo.Buffer );
 385         params->Flags &= ~PROCESS_PARAMS_FLAG_NORMALIZED;
 386     }
 387     return params;
 388 }
 389
 390
 391 /* append a unicode string to the process params data; helper for RtlCreateProcessParameters */
 392 static void append_unicode_string( void **data, const UNICODE_STRING *src,
 393                                    UNICODE_STRING *dst )
 394 {
 395     dst->Length = src->Length;
 396     dst->MaximumLength = src->MaximumLength;
 397     dst->Buffer = *data;
 398     memcpy( dst->Buffer, src->Buffer, dst->MaximumLength );
 399     *data = (char *)dst->Buffer + dst->MaximumLength;
 400 }
 401
 402
 403 /******************************************************************************
 404  *  RtlCreateProcessParameters  [NTDLL.@]
 405  */
 406 NTSTATUS WINAPI RtlCreateProcessParameters( RTL_USER_PROCESS_PARAMETERS **result,
 407                                             const UNICODE_STRING *ImagePathName,
 408                                             const UNICODE_STRING *DllPath,
 409                                             const UNICODE_STRING *CurrentDirectoryName,
 410                                             const UNICODE_STRING *CommandLine,
 411                                             PWSTR Environment,
 412                                             const UNICODE_STRING *WindowTitle,
 413                                             const UNICODE_STRING *Desktop,
 414                                             const UNICODE_STRING *ShellInfo,
 415                                             const UNICODE_STRING *RuntimeInfo )
 416 {
 417     static const WCHAR empty[] = {0};
 418     static const UNICODE_STRING empty_str = { 0, sizeof(empty), (WCHAR *)empty };
 419
 420     const RTL_USER_PROCESS_PARAMETERS *cur_params;
 421     ULONG size, total_size;
 422     void *ptr;
 423     NTSTATUS status;
 424
 425     RtlAcquirePebLock();
 426     cur_params = NtCurrentTeb()->Peb->ProcessParameters;
 427     if (!DllPath) DllPath = &cur_params->DllPath;
 428     if (!CurrentDirectoryName) CurrentDirectoryName = &cur_params->CurrentDirectoryName;
 429     if (!CommandLine) CommandLine = ImagePathName;
 430     if (!Environment) Environment = cur_params->Environment;
 431     if (!WindowTitle) WindowTitle = &empty_str;
 432     if (!Desktop) Desktop = &empty_str;
 433     if (!ShellInfo) ShellInfo = &empty_str;
 434     if (!RuntimeInfo) RuntimeInfo = &empty_str;
 435
 436     size = (sizeof(RTL_USER_PROCESS_PARAMETERS)
 437             + ImagePathName->MaximumLength
 438             + DllPath->MaximumLength
 439             + CurrentDirectoryName->MaximumLength
 440             + CommandLine->MaximumLength
 441             + WindowTitle->MaximumLength
 442             + Desktop->MaximumLength
 443             + ShellInfo->MaximumLength
 444             + RuntimeInfo->MaximumLength);
 445
 446     total_size = size;
 447     if ((status = NtAllocateVirtualMemory( NtCurrentProcess(), &ptr, NULL, &total_size,
 448                                            MEM_COMMIT, PAGE_READWRITE )) == STATUS_SUCCESS)
 449     {
 450         RTL_USER_PROCESS_PARAMETERS *params = ptr;
 451         params->AllocationSize = total_size;
 452         params->Size           = size;
 453         params->Flags          = PROCESS_PARAMS_FLAG_NORMALIZED;
 454         params->ProcessGroup   = cur_params->ProcessGroup;
 455         params->Environment    = Environment;
 456         /* all other fields are zero */
 457
 458         ptr = params + 1;
 459         append_unicode_string( &ptr, CurrentDirectoryName, &params->CurrentDirectoryName );
 460         append_unicode_string( &ptr, DllPath, &params->DllPath );
 461         append_unicode_string( &ptr, ImagePathName, &params->ImagePathName );
 462         append_unicode_string( &ptr, CommandLine, &params->CommandLine );
 463         append_unicode_string( &ptr, WindowTitle, &params->WindowTitle );
 464         append_unicode_string( &ptr, Desktop, &params->Desktop );
 465         append_unicode_string( &ptr, ShellInfo, &params->ShellInfo );
 466         append_unicode_string( &ptr, RuntimeInfo, &params->RuntimeInfo );
 467         *result = RtlDeNormalizeProcessParams( params );
 468     }
 469     RtlReleasePebLock();
 470     return status;
 471 }
 472
 473
 474 /******************************************************************************
 475  *  RtlDestroyProcessParameters  [NTDLL.@]
 476  */
 477 void WINAPI RtlDestroyProcessParameters( RTL_USER_PROCESS_PARAMETERS *params )
 478 {
 479     void *ptr = params;
 480     ULONG size = 0;
 481     NtFreeVirtualMemory( NtCurrentProcess(), &ptr, &size, MEM_RELEASE );
 482 }