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 BYTE *get_regdata(const WCHAR *data, DWORD reg_type, WCHAR separator, DWORD *size_bytes)
  52 {
  53     static const WCHAR empty;
  54     LPBYTE out_data = NULL;
  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             out_data = malloc(*size_bytes);
  68             lstrcpyW((LPWSTR)out_data,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_INTEGER);
  80                 break;
  81             }
  82             *size_bytes = sizeof(DWORD);
  83             out_data = malloc(*size_bytes);
  84             ((LPDWORD)out_data)[0] = val;
  85             break;
  86         }
  87         case REG_BINARY:
  88         {
  89             BYTE hex0, hex1;
  90             int i = 0, destByteIndex = 0, datalen = lstrlenW(data);
  91             *size_bytes = ((datalen + datalen % 2) / 2) * sizeof(BYTE);
  92             out_data = malloc(*size_bytes);
  93             if(datalen % 2)
  94             {
  95                 hex1 = hexchar_to_byte(data[i++]);
  96                 if(hex1 == 0xFF)
  97                     goto no_hex_data;
  98                 out_data[destByteIndex++] = hex1;
  99             }
 100             for(;i + 1 < datalen;i += 2)
 101             {
 102                 hex0 = hexchar_to_byte(data[i]);
 103                 hex1 = hexchar_to_byte(data[i + 1]);
 104                 if(hex0 == 0xFF || hex1 == 0xFF)
 105                     goto no_hex_data;
 106                 out_data[destByteIndex++] = (hex0 << 4) | hex1;
 107             }
 108             break;
 109             no_hex_data:
 110             /* cleanup, print error */
 111             free(out_data);
 112             output_message(STRING_MISSING_HEXDATA);
 113             out_data = NULL;
 114             break;
 115         }
 116         case REG_MULTI_SZ:
 117         {
 118             int i, destindex, len = lstrlenW(data);
 119             WCHAR *buffer = malloc((len + 2) * sizeof(WCHAR));
 120
 121             for (i = 0, destindex = 0; i < len; i++, destindex++)
 122             {
 123                 if (!separator && data[i] == '\\' && data[i + 1] == '0')
 124                 {
 125                     buffer[destindex] = 0;
 126                     i++;
 127                 }
 128                 else if (data[i] == separator)
 129                     buffer[destindex] = 0;
 130                 else
 131                     buffer[destindex] = data[i];
 132
 133                 if (destindex && !buffer[destindex - 1] && (!buffer[destindex] || destindex == 1))
 134                 {
 135                     free(buffer);
 136                     output_message(STRING_INVALID_STRING);
 137                     return NULL;
 138                 }
 139             }
 140             buffer[destindex] = 0;
 141             if (destindex && buffer[destindex - 1])
 142                 buffer[++destindex] = 0;
 143             *size_bytes = (destindex + 1) * sizeof(WCHAR);
 144             return (BYTE *)buffer;
 145         }
 146         default:
 147             output_message(STRING_UNHANDLED_TYPE, reg_type, data);
 148     }
 149
 150     return out_data;
 151 }
 152
 153 static int run_add(HKEY root, WCHAR *path, WCHAR *value_name, BOOL value_empty,
 154                    WCHAR *type, WCHAR separator, WCHAR *data, BOOL force)
 155 {
 156     HKEY hkey;
 157     DWORD data_type, data_size;
 158     BYTE *reg_data = NULL;
 159     LONG rc;
 160
 161     if (RegCreateKeyExW(root, path, 0, NULL, REG_OPTION_NON_VOLATILE,
 162                         KEY_READ|KEY_WRITE, NULL, &hkey, NULL))
 163     {
 164         output_message(STRING_ACCESS_DENIED);
 165         return 1;
 166     }
 167
 168     if (!force)
 169     {
 170         if (RegQueryValueExW(hkey, value_name, NULL, NULL, NULL, NULL) == ERROR_SUCCESS)
 171         {
 172             if (!ask_confirm(STRING_OVERWRITE_VALUE, value_name))
 173             {
 174                 RegCloseKey(hkey);
 175                 output_message(STRING_CANCELLED);
 176                 return 0;
 177             }
 178         }
 179     }
 180
 181     data_type = wchar_get_type(type);
 182
 183     if (data_type == ~0u)
 184     {
 185         RegCloseKey(hkey);
 186         output_message(STRING_UNSUPPORTED_TYPE, type);
 187         return 1;
 188     }
 189
 190     if ((data_type == REG_DWORD || data_type == REG_DWORD_BIG_ENDIAN) && !data)
 191     {
 192          RegCloseKey(hkey);
 193          output_message(STRING_INVALID_CMDLINE);
 194          return 1;
 195     }
 196
 197     if (!(reg_data = get_regdata(data, data_type, separator, &data_size)))
 198     {
 199         RegCloseKey(hkey);
 200         return 1;
 201     }
 202
 203     rc = RegSetValueExW(hkey, value_name, 0, data_type, reg_data, data_size);
 204
 205     free(reg_data);
 206     RegCloseKey(hkey);
 207
 208     if (rc)
 209     {
 210         output_message(STRING_ACCESS_DENIED);
 211         return 1;
 212     }
 213
 214     output_message(STRING_SUCCESS);
 215
 216     return 0;
 217 }
 218
 219 int reg_add(int argc, WCHAR *argvW[])
 220 {
 221     HKEY root;
 222     WCHAR *path, *value_name = NULL, *type = NULL, *data = NULL, separator = '\0';
 223     BOOL value_empty = FALSE, force = FALSE;
 224     int i;
 225
 226     if (!parse_registry_key(argvW[2], &root, &path))
 227         return 1;
 228
 229     for (i = 3; i < argc; i++)
 230     {
 231         WCHAR *str;
 232
 233         if (argvW[i][0] != '/' && argvW[i][0] != '-')
 234             goto invalid;
 235
 236         str = &argvW[i][1];
 237
 238         if (!lstrcmpiW(str, L"ve"))
 239         {
 240             if (value_empty) goto invalid;
 241             value_empty = TRUE;
 242             continue;
 243         }
 244         else if (!lstrcmpiW(str, L"reg:32") || !lstrcmpiW(str, L"reg:64"))
 245             continue;
 246         else if (!str[0] || str[1])
 247             goto invalid;
 248
 249         switch (towlower(*str))
 250         {
 251         case 'v':
 252             if (value_name || !(value_name = argvW[++i]))
 253                 goto invalid;
 254             break;
 255         case 't':
 256             if (type || !(type = argvW[++i]))
 257                 goto invalid;
 258             break;
 259         case 'd':
 260             if (data || !(data = argvW[++i]))
 261                 goto invalid;
 262             break;
 263         case 's':
 264             str = argvW[++i];
 265             if (separator || !str || lstrlenW(str) != 1)
 266                 goto invalid;
 267             separator = str[0];
 268             break;
 269         case 'f':
 270             if (force) goto invalid;
 271             force = TRUE;
 272             break;
 273         default:
 274             goto invalid;
 275         }
 276     }
 277
 278     if (value_name && value_empty)
 279         goto invalid;
 280
 281     return run_add(root, path, value_name, value_empty, type, separator, data, force);
 282
 283 invalid:
 284     output_message(STRING_INVALID_SYNTAX);
 285     output_message(STRING_FUNC_HELP, wcsupr(argvW[1]));
 286     return 1;
 287 }