programs/reg/add.c

   1 /*
   2  * Copyright 2016-2017, 2021 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 <errno.h>
  20 #include "reg.h"
  21
  22 static DWORD wchar_get_type(const WCHAR *type_name)
  23 {
  24     DWORD i;
  25
  26     if (!type_name)
  27         return REG_SZ;
  28
  29     for (i = 0; i < ARRAY_SIZE(type_rels); i++)
  30     {
  31         if (!wcsicmp(type_rels[i].name, type_name))
  32             return type_rels[i].type;
  33     }
  34
  35     return ~0u;
  36 }
  37
  38 /* hexchar_to_byte from programs/regedit/hexedit.c */
  39 static inline BYTE hexchar_to_byte(WCHAR ch)
  40 {
  41     if (ch >= '0' && ch <= '9')
  42         return ch - '0';
  43     else if (ch >= 'a' && ch <= 'f')
  44         return ch - 'a' + 10;
  45     else if (ch >= 'A' && ch <= 'F')
  46         return ch - 'A' + 10;
  47     else
  48         return -1;
  49 }
  50
  51 static BOOL get_regdata(const WCHAR *data, DWORD reg_type, WCHAR separator,
  52                         BYTE **data_bytes, DWORD *size_bytes)
  53 {
  54     static const WCHAR empty;
  55
  56     *size_bytes = 0;
  57
  58     if (!data) data = &empty;
  59
  60     switch (reg_type)
  61     {
  62         case REG_NONE:
  63         case REG_SZ:
  64         case REG_EXPAND_SZ:
  65         {
  66             *size_bytes = (lstrlenW(data) + 1) * sizeof(WCHAR);
  67             *data_bytes = malloc(*size_bytes);
  68             lstrcpyW((WCHAR *)*data_bytes, data);
  69             break;
  70         }
  71         case REG_DWORD:
  72      /* case REG_DWORD_LITTLE_ENDIAN: */
  73         case REG_DWORD_BIG_ENDIAN: /* Yes, this is correct! */
  74         {
  75             LPWSTR rest;
  76             unsigned long val;
  77             val = wcstoul(data, &rest, (towlower(data[1]) == 'x') ? 16 : 10);
  78             if (*rest || data[0] == '-' || (val == ~0u && errno == ERANGE)) {
  79                 output_message(STRING_MISSING_NUMBER);
  80                 return FALSE;
  81             }
  82             *size_bytes = sizeof(DWORD);
  83             *data_bytes = malloc(*size_bytes);
  84             *(DWORD *)*data_bytes = val;
  85             break;
  86         }
  87         case REG_BINARY:
  88         {
  89             BYTE hex0, hex1, *ptr;
  90             int i = 0, destByteIndex = 0, datalen = lstrlenW(data);
  91
  92             if (!datalen) return TRUE;
  93
  94             *size_bytes = ((datalen + datalen % 2) / 2) * sizeof(BYTE);
  95             *data_bytes = malloc(*size_bytes);
  96
  97             if (datalen % 2)
  98             {
  99                 hex1 = hexchar_to_byte(data[i++]);
 100                 if (hex1 == 0xFF)
 101                     goto no_hex_data;
 102                 *data_bytes[destByteIndex++] = hex1;
 103             }
 104
 105             ptr = *data_bytes;
 106
 107             for (; i + 1 < datalen; i += 2)
 108             {
 109                 hex0 = hexchar_to_byte(data[i]);
 110                 hex1 = hexchar_to_byte(data[i + 1]);
 111                 if (hex0 == 0xFF || hex1 == 0xFF)
 112                     goto no_hex_data;
 113                 ptr[destByteIndex++] = (hex0 << 4) | hex1;
 114             }
 115             break;
 116
 117             no_hex_data:
 118             free(*data_bytes);
 119             *data_bytes = NULL;
 120             output_message(STRING_MISSING_HEXDATA);
 121             return FALSE;
 122         }
 123         case REG_MULTI_SZ:
 124         {
 125             int i, destindex, len = lstrlenW(data);
 126             WCHAR *buffer = malloc((len + 2) * sizeof(WCHAR));
 127
 128             for (i = 0, destindex = 0; i < len; i++, destindex++)
 129             {
 130                 if (!separator && data[i] == '\\' && data[i + 1] == '0')
 131                 {
 132                     buffer[destindex] = 0;
 133                     i++;
 134                 }
 135                 else if (data[i] == separator)
 136                     buffer[destindex] = 0;
 137                 else
 138                     buffer[destindex] = data[i];
 139
 140                 if (destindex && !buffer[destindex - 1] && (!buffer[destindex] || destindex == 1))
 141                 {
 142                     free(buffer);
 143                     output_message(STRING_INVALID_STRING);
 144                     return FALSE;
 145                 }
 146             }
 147             buffer[destindex] = 0;
 148             if (destindex && buffer[destindex - 1])
 149                 buffer[++destindex] = 0;
 150             *size_bytes = (destindex + 1) * sizeof(WCHAR);
 151             *data_bytes = (BYTE *)buffer;
 152             break;
 153         }
 154         default:
 155             output_message(STRING_UNHANDLED_TYPE, reg_type, data);
 156     }
 157
 158     return TRUE;
 159 }
 160
 161 static int run_add(HKEY root, WCHAR *path, REGSAM sam, WCHAR *value_name, BOOL value_empty,
 162                    WCHAR *type, WCHAR separator, WCHAR *data, BOOL force)
 163 {
 164     HKEY hkey;
 165     DWORD dispos, data_type, data_size;
 166     BYTE *reg_data = NULL;
 167     LONG rc;
 168
 169     if (RegCreateKeyExW(root, path, 0, NULL, REG_OPTION_NON_VOLATILE,
 170                         KEY_READ|KEY_WRITE|sam, NULL, &hkey, &dispos))
 171     {
 172         output_message(STRING_ACCESS_DENIED);
 173         return 1;
 174     }
 175
 176     if (!force && dispos == REG_OPENED_EXISTING_KEY)
 177     {
 178         if (RegQueryValueExW(hkey, value_name, NULL, NULL, NULL, NULL) == ERROR_SUCCESS)
 179         {
 180             if (!ask_confirm(STRING_OVERWRITE_VALUE, value_name))
 181             {
 182                 RegCloseKey(hkey);
 183                 output_message(STRING_CANCELLED);
 184                 return 0;
 185             }
 186         }
 187     }
 188
 189     data_type = wchar_get_type(type);
 190
 191     if (data_type == ~0u)
 192     {
 193         RegCloseKey(hkey);
 194         output_message(STRING_UNSUPPORTED_TYPE, type);
 195         return 1;
 196     }
 197
 198     if ((data_type == REG_DWORD || data_type == REG_DWORD_BIG_ENDIAN) && !data)
 199     {
 200          RegCloseKey(hkey);
 201          output_message(STRING_INVALID_CMDLINE);
 202          return 1;
 203     }
 204
 205     if (!get_regdata(data, data_type, separator, &reg_data, &data_size))
 206     {
 207         RegCloseKey(hkey);
 208         return 1;
 209     }
 210
 211     rc = RegSetValueExW(hkey, value_name, 0, data_type, reg_data, data_size);
 212
 213     free(reg_data);
 214     RegCloseKey(hkey);
 215
 216     if (rc)
 217     {
 218         output_message(STRING_ACCESS_DENIED);
 219         return 1;
 220     }
 221
 222     output_message(STRING_SUCCESS);
 223
 224     return 0;
 225 }
 226
 227 int reg_add(int argc, WCHAR *argvW[])
 228 {
 229     HKEY root;
 230     WCHAR *path, *value_name = NULL, *type = NULL, *data = NULL, separator = '\0';
 231     BOOL value_empty = FALSE, force = FALSE;
 232     REGSAM sam = 0;
 233     int i;
 234
 235     if (!parse_registry_key(argvW[2], &root, &path))
 236         return 1;
 237
 238     for (i = 3; i < argc; i++)
 239     {
 240         WCHAR *str;
 241
 242         if (argvW[i][0] != '/' && argvW[i][0] != '-')
 243             goto invalid;
 244
 245         str = &argvW[i][1];
 246
 247         if (!lstrcmpiW(str, L"ve"))
 248         {
 249             if (value_empty) goto invalid;
 250             value_empty = TRUE;
 251             continue;
 252         }
 253         else if (!lstrcmpiW(str, L"reg:32"))
 254         {
 255             if (sam & KEY_WOW64_32KEY) goto invalid;
 256             sam |= KEY_WOW64_32KEY;
 257             continue;
 258         }
 259         else if (!lstrcmpiW(str, L"reg:64"))
 260         {
 261             if (sam & KEY_WOW64_64KEY) goto invalid;
 262             sam |= KEY_WOW64_64KEY;
 263             continue;
 264         }
 265         else if (!str[0] || str[1])
 266             goto invalid;
 267
 268         switch (towlower(*str))
 269         {
 270         case 'v':
 271             if (value_name || !(value_name = argvW[++i]))
 272                 goto invalid;
 273             break;
 274         case 't':
 275             if (type || !(type = argvW[++i]))
 276                 goto invalid;
 277             break;
 278         case 'd':
 279             if (data || !(data = argvW[++i]))
 280                 goto invalid;
 281             break;
 282         case 's':
 283             str = argvW[++i];
 284             if (separator || !str || lstrlenW(str) != 1)
 285                 goto invalid;
 286             separator = str[0];
 287             break;
 288         case 'f':
 289             if (force) goto invalid;
 290             force = TRUE;
 291             break;
 292         default:
 293             goto invalid;
 294         }
 295     }
 296
 297     if (value_name && value_empty)
 298         goto invalid;
 299
 300     if (sam == (KEY_WOW64_32KEY|KEY_WOW64_64KEY))
 301         goto invalid;
 302
 303     return run_add(root, path, sam, value_name, value_empty, type, separator, data, force);
 304
 305 invalid:
 306     output_message(STRING_INVALID_SYNTAX);
 307     output_message(STRING_FUNC_HELP, wcsupr(argvW[1]));
 308     return 1;
 309 }