programs/reg/export.c

   1 /*
   2  * Copyright 2017 Hugh McMaster
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <windows.h>
  20 #include <stdlib.h>
  21
  22 #include <wine/unicode.h>
  23 #include <wine/heap.h>
  24
  25 #include "reg.h"
  26
  27 static void write_file(HANDLE hFile, const WCHAR *str)
  28 {
  29     DWORD written;
  30
  31     WriteFile(hFile, str, lstrlenW(str) * sizeof(WCHAR), &written, NULL);
  32 }
  33
  34 static WCHAR *escape_string(WCHAR *str, size_t str_len, size_t *line_len)
  35 {
  36     size_t i, escape_count, pos;
  37     WCHAR *buf;
  38
  39     for (i = 0, escape_count = 0; i < str_len; i++)
  40     {
  41         WCHAR c = str[i];
  42         if (c == '\r' || c == '\n' || c == '\\' || c == '"' || c == '\0')
  43             escape_count++;
  44     }
  45
  46     buf = heap_xalloc((str_len + escape_count + 1) * sizeof(WCHAR));
  47
  48     for (i = 0, pos = 0; i < str_len; i++, pos++)
  49     {
  50         WCHAR c = str[i];
  51
  52         switch (c)
  53         {
  54         case '\r':
  55             buf[pos++] = '\\';
  56             buf[pos] = 'r';
  57             break;
  58         case '\n':
  59             buf[pos++] = '\\';
  60             buf[pos] = 'n';
  61             break;
  62         case '\\':
  63             buf[pos++] = '\\';
  64             buf[pos] = '\\';
  65             break;
  66         case '"':
  67             buf[pos++] = '\\';
  68             buf[pos] = '"';
  69             break;
  70         case '\0':
  71             buf[pos++] = '\\';
  72             buf[pos] = '0';
  73             break;
  74         default:
  75             buf[pos] = c;
  76         }
  77     }
  78
  79     buf[pos] = 0;
  80     *line_len = pos;
  81     return buf;
  82 }
  83
  84 static size_t export_value_name(HANDLE hFile, WCHAR *name, size_t len)
  85 {
  86     static const WCHAR quoted_fmt[] = {'"','%','s','"','=',0};
  87     static const WCHAR default_name[] = {'@','=',0};
  88     size_t line_len;
  89
  90     if (name && *name)
  91     {
  92         WCHAR *str = escape_string(name, len, &line_len);
  93         WCHAR *buf = heap_xalloc((line_len + 4) * sizeof(WCHAR));
  94         line_len = sprintfW(buf, quoted_fmt, str);
  95         write_file(hFile, buf);
  96         heap_free(buf);
  97         heap_free(str);
  98     }
  99     else
 100     {
 101         line_len = lstrlenW(default_name);
 102         write_file(hFile, default_name);
 103     }
 104
 105     return line_len;
 106 }
 107
 108 static void export_string_data(WCHAR **buf, WCHAR *data, size_t size)
 109 {
 110     size_t len = 0, line_len;
 111     WCHAR *str;
 112     static const WCHAR fmt[] = {'"','%','s','"',0};
 113
 114     if (size)
 115         len = size / sizeof(WCHAR) - 1;
 116     str = escape_string(data, len, &line_len);
 117     *buf = heap_xalloc((line_len + 3) * sizeof(WCHAR));
 118     sprintfW(*buf, fmt, str);
 119     heap_free(str);
 120 }
 121
 122 static void export_dword_data(WCHAR **buf, DWORD *data)
 123 {
 124     static const WCHAR fmt[] = {'d','w','o','r','d',':','%','0','8','x',0};
 125
 126     *buf = heap_xalloc(15 * sizeof(WCHAR));
 127     sprintfW(*buf, fmt, *data);
 128 }
 129
 130 static size_t export_hex_data_type(HANDLE hFile, DWORD type)
 131 {
 132     static const WCHAR hex[] = {'h','e','x',':',0};
 133     static const WCHAR hexp_fmt[] = {'h','e','x','(','%','x',')',':',0};
 134     size_t line_len;
 135
 136     if (type == REG_BINARY)
 137     {
 138         line_len = lstrlenW(hex);
 139         write_file(hFile, hex);
 140     }
 141     else
 142     {
 143         WCHAR *buf = heap_xalloc(15 * sizeof(WCHAR));
 144         line_len = sprintfW(buf, hexp_fmt, type);
 145         write_file(hFile, buf);
 146         heap_free(buf);
 147     }
 148
 149     return line_len;
 150 }
 151
 152 #define MAX_HEX_CHARS 77
 153
 154 static void export_hex_data(HANDLE hFile, WCHAR **buf, DWORD type,
 155                             DWORD line_len, void *data, DWORD size)
 156 {
 157     static const WCHAR fmt[] = {'%','0','2','x',0};
 158     static const WCHAR hex_concat[] = {'\\','\r','\n',' ',' ',0};
 159     size_t num_commas, i, pos;
 160
 161     line_len += export_hex_data_type(hFile, type);
 162
 163     if (!size) return;
 164
 165     num_commas = size - 1;
 166     *buf = heap_xalloc(size * 3 * sizeof(WCHAR));
 167
 168     for (i = 0, pos = 0; i < size; i++)
 169     {
 170         pos += sprintfW(*buf + pos, fmt, ((BYTE *)data)[i]);
 171         if (i == num_commas) break;
 172         (*buf)[pos++] = ',';
 173         (*buf)[pos] = 0;
 174         line_len += 3;
 175
 176         if (line_len >= MAX_HEX_CHARS)
 177         {
 178             write_file(hFile, *buf);
 179             write_file(hFile, hex_concat);
 180             line_len = 2;
 181             pos = 0;
 182         }
 183     }
 184 }
 185
 186 static void export_newline(HANDLE hFile)
 187 {
 188     static const WCHAR newline[] = {'\r','\n',0};
 189
 190     write_file(hFile, newline);
 191 }
 192
 193 static void export_data(HANDLE hFile, WCHAR *value_name, DWORD value_len,
 194                         DWORD type, void *data, size_t size)
 195 {
 196     WCHAR *buf = NULL;
 197     size_t line_len = export_value_name(hFile, value_name, value_len);
 198
 199     switch (type)
 200     {
 201     case REG_SZ:
 202         export_string_data(&buf, data, size);
 203         break;
 204     case REG_DWORD:
 205         if (size)
 206         {
 207             export_dword_data(&buf, data);
 208             break;
 209         }
 210         /* fall through */
 211     case REG_NONE:
 212     case REG_EXPAND_SZ:
 213     case REG_BINARY:
 214     case REG_MULTI_SZ:
 215     default:
 216         export_hex_data(hFile, &buf, type, line_len, data, size);
 217         break;
 218     }
 219
 220     if (size || type == REG_SZ)
 221     {
 222         write_file(hFile, buf);
 223         heap_free(buf);
 224     }
 225
 226     export_newline(hFile);
 227 }
 228
 229 static void export_key_name(HANDLE hFile, WCHAR *name)
 230 {
 231     static const WCHAR fmt[] = {'\r','\n','[','%','s',']','\r','\n',0};
 232     WCHAR *buf;
 233
 234     buf = heap_xalloc((lstrlenW(name) + 7) * sizeof(WCHAR));
 235     sprintfW(buf, fmt, name);
 236     write_file(hFile, buf);
 237     heap_free(buf);
 238 }
 239
 240 static int export_registry_data(HANDLE hFile, HKEY key, WCHAR *path)
 241 {
 242     LONG rc;
 243     DWORD max_value_len = 256, value_len;
 244     DWORD max_data_bytes = 2048, data_size;
 245     DWORD subkey_len;
 246     DWORD i, type, path_len;
 247     WCHAR *value_name, *subkey_name, *subkey_path;
 248     BYTE *data;
 249     HKEY subkey;
 250
 251     export_key_name(hFile, path);
 252
 253     value_name = heap_xalloc(max_value_len * sizeof(WCHAR));
 254     data = heap_xalloc(max_data_bytes);
 255
 256     i = 0;
 257     for (;;)
 258     {
 259         value_len = max_value_len;
 260         data_size = max_data_bytes;
 261         rc = RegEnumValueW(key, i, value_name, &value_len, NULL, &type, data, &data_size);
 262
 263         if (rc == ERROR_SUCCESS)
 264         {
 265             export_data(hFile, value_name, value_len, type, data, data_size);
 266             i++;
 267         }
 268         else if (rc == ERROR_MORE_DATA)
 269         {
 270             if (data_size > max_data_bytes)
 271             {
 272                 max_data_bytes = data_size;
 273                 data = heap_xrealloc(data, max_data_bytes);
 274             }
 275             else
 276             {
 277                 max_value_len *= 2;
 278                 value_name = heap_xrealloc(value_name, max_value_len * sizeof(WCHAR));
 279             }
 280         }
 281         else break;
 282     }
 283
 284     heap_free(data);
 285     heap_free(value_name);
 286
 287     subkey_name = heap_xalloc(MAX_SUBKEY_LEN * sizeof(WCHAR));
 288
 289     path_len = lstrlenW(path);
 290
 291     i = 0;
 292     for (;;)
 293     {
 294         subkey_len = MAX_SUBKEY_LEN;
 295         rc = RegEnumKeyExW(key, i, subkey_name, &subkey_len, NULL, NULL, NULL, NULL);
 296         if (rc == ERROR_SUCCESS)
 297         {
 298             subkey_path = build_subkey_path(path, path_len, subkey_name, subkey_len);
 299             if (!RegOpenKeyExW(key, subkey_name, 0, KEY_READ, &subkey))
 300             {
 301                 export_registry_data(hFile, subkey, subkey_path);
 302                 RegCloseKey(subkey);
 303             }
 304             heap_free(subkey_path);
 305             i++;
 306         }
 307         else break;
 308     }
 309
 310     heap_free(subkey_name);
 311     return 0;
 312 }
 313
 314 static void export_file_header(HANDLE hFile)
 315 {
 316     static const WCHAR header[] = { 0xfeff,'W','i','n','d','o','w','s',' ',
 317                                    'R','e','g','i','s','t','r','y',' ','E','d','i','t','o','r',' ',
 318                                    'V','e','r','s','i','o','n',' ','5','.','0','0','\r','\n'};
 319
 320     write_file(hFile, header);
 321 }
 322
 323 static HANDLE create_file(const WCHAR *filename, DWORD action)
 324 {
 325     return CreateFileW(filename, GENERIC_WRITE, 0, NULL, action, FILE_ATTRIBUTE_NORMAL, NULL);
 326 }
 327
 328 static HANDLE get_file_handle(WCHAR *filename, BOOL overwrite_file)
 329 {
 330     HANDLE hFile = create_file(filename, overwrite_file ? CREATE_ALWAYS : CREATE_NEW);
 331
 332     if (hFile == INVALID_HANDLE_VALUE)
 333     {
 334         DWORD error = GetLastError();
 335
 336         if (error == ERROR_FILE_EXISTS)
 337         {
 338             if (!ask_confirm(STRING_OVERWRITE_FILE, filename))
 339             {
 340                 output_message(STRING_CANCELLED);
 341                 exit(0);
 342             }
 343
 344             hFile = create_file(filename, CREATE_ALWAYS);
 345         }
 346         else
 347         {
 348             WCHAR *str;
 349
 350             FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
 351                            FORMAT_MESSAGE_IGNORE_INSERTS, NULL, error, 0, (WCHAR *)&str, 0, NULL);
 352             output_writeconsole(str, lstrlenW(str));
 353             LocalFree(str);
 354             exit(1);
 355         }
 356     }
 357
 358     return hFile;
 359 }
 360
 361 static BOOL is_overwrite_switch(const WCHAR *s)
 362 {
 363     if (strlenW(s) > 2)
 364         return FALSE;
 365
 366     if ((s[0] == '/' || s[0] == '-') && (s[1] == 'y' || s[1] == 'Y'))
 367         return TRUE;
 368
 369     return FALSE;
 370 }
 371
 372 int reg_export(int argc, WCHAR *argv[])
 373 {
 374     HKEY root, hkey;
 375     WCHAR *path, *long_key;
 376     BOOL overwrite_file = FALSE;
 377     HANDLE hFile;
 378     int ret;
 379
 380     if (argc == 3 || argc > 5)
 381         goto error;
 382
 383     if (!parse_registry_key(argv[2], &root, &path, &long_key))
 384         return 1;
 385
 386     if (argc == 5 && !(overwrite_file = is_overwrite_switch(argv[4])))
 387         goto error;
 388
 389     if (RegOpenKeyExW(root, path, 0, KEY_READ, &hkey))
 390     {
 391         output_message(STRING_INVALID_KEY);
 392         return 1;
 393     }
 394
 395     hFile = get_file_handle(argv[3], overwrite_file);
 396     export_file_header(hFile);
 397     ret = export_registry_data(hFile, hkey, long_key);
 398     export_newline(hFile);
 399     CloseHandle(hFile);
 400
 401     RegCloseKey(hkey);
 402
 403     return ret;
 404
 405 error:
 406     output_message(STRING_INVALID_SYNTAX);
 407     output_message(STRING_FUNC_HELP, struprW(argv[1]));
 408     return 1;
 409 }