source/lib/util_reg_api.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Registry helper routines
   4  * Copyright (C) Volker Lendecke 2006
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc., 675
  18  * Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22
  23 WERROR registry_pull_value(TALLOC_CTX *mem_ctx,
  24                            struct registry_value **pvalue,
  25                            enum winreg_Type type, uint8 *data,
  26                            uint32 size, uint32 length)
  27 {
  28         struct registry_value *value;
  29         WERROR err;
  30
  31         if (!(value = TALLOC_ZERO_P(mem_ctx, struct registry_value))) {
  32                 return WERR_NOMEM;
  33         }
  34
  35         value->type = type;
  36
  37         switch (type) {
  38         case REG_DWORD:
  39                 if ((size != 4) || (length != 4)) {
  40                         err = WERR_INVALID_PARAM;
  41                         goto error;
  42                 }
  43                 value->v.dword = IVAL(data, 0);
  44                 break;
  45         case REG_SZ:
  46         case REG_EXPAND_SZ:
  47         {
  48                 /*
  49                  * Make sure we get a NULL terminated string for
  50                  * convert_string_talloc().
  51                  */
  52
  53                 smb_ucs2_t *tmp;
  54
  55                 if (length == 1) {
  56                         /* win2k regedit gives us a string of 1 byte when
  57                          * creating a new value of type REG_SZ. this workaround
  58                          * replaces the input by using the same string as
  59                          * winxp delivers. */
  60                         length = 2;
  61                         if (!(tmp = SMB_MALLOC_ARRAY(smb_ucs2_t, 2))) {
  62                                 err = WERR_NOMEM;
  63                                 goto error;
  64                         }
  65                         tmp[0] = 2;
  66                         tmp[1] = 0;
  67                 }
  68                 else if ((length % 2) != 0) {
  69                         err = WERR_INVALID_PARAM;
  70                         goto error;
  71                 }
  72                 else {
  73                         uint32 num_ucs2 = length / 2;
  74                         if (!(tmp = SMB_MALLOC_ARRAY(smb_ucs2_t, num_ucs2+1))) {
  75                                 err = WERR_NOMEM;
  76                                 goto error;
  77                         }
  78
  79                         memcpy((void *)tmp, (const void *)data, length);
  80                         tmp[num_ucs2] = 0;
  81                 }
  82
  83                 if (length + 2 < length) {
  84                         /* Integer wrap. */
  85                         SAFE_FREE(tmp);
  86                         err = WERR_INVALID_PARAM;
  87                         goto error;
  88                 }
  89
  90                 value->v.sz.len = convert_string_talloc(
  91                         value, CH_UTF16LE, CH_UNIX, tmp, length+2,
  92                         &value->v.sz.str, False);
  93
  94                 SAFE_FREE(tmp);
  95
  96                 if (value->v.sz.len == (size_t)-1) {
  97                         err = WERR_INVALID_PARAM;
  98                         goto error;
  99                 }
 100                 break;
 101         }
 102         case REG_MULTI_SZ:
 103                 err = reg_pull_multi_sz(value, (void *)data, length,
 104                                         &value->v.multi_sz.num_strings,
 105                                         &value->v.multi_sz.strings);
 106                 if (!(W_ERROR_IS_OK(err))) {
 107                         goto error;
 108                 }
 109                 break;
 110         case REG_BINARY:
 111                 value->v.binary.data = talloc_move(value, &data);
 112                 value->v.binary.length = length;
 113                 break;
 114         default:
 115                 err = WERR_INVALID_PARAM;
 116                 goto error;
 117         }
 118
 119         *pvalue = value;
 120         return WERR_OK;
 121
 122  error:
 123         TALLOC_FREE(value);
 124         return err;
 125 }
 126
 127 WERROR registry_push_value(TALLOC_CTX *mem_ctx,
 128                            const struct registry_value *value,
 129                            DATA_BLOB *presult)
 130 {
 131         switch (value->type) {
 132         case REG_DWORD: {
 133                 char buf[4];
 134                 SIVAL(buf, 0, value->v.dword);
 135                 *presult = data_blob_talloc(mem_ctx, (void *)buf, 4);
 136                 if (presult->data == NULL) {
 137                         return WERR_NOMEM;
 138                 }
 139                 break;
 140         }
 141         case REG_SZ:
 142         case REG_EXPAND_SZ: {
 143                 presult->length = convert_string_talloc(
 144                         mem_ctx, CH_UNIX, CH_UTF16LE, value->v.sz.str,
 145                         MIN(value->v.sz.len, strlen(value->v.sz.str)+1),
 146                         (void *)&(presult->data), False);
 147                 if (presult->length == (size_t)-1) {
 148                         return WERR_NOMEM;
 149                 }
 150                 break;
 151         }
 152         default:
 153                 return WERR_INVALID_PARAM;
 154         }
 155
 156         return WERR_OK;
 157 }