source3/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 3 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21
  22 WERROR registry_pull_value(TALLOC_CTX *mem_ctx,
  23                            struct registry_value **pvalue,
  24                            enum winreg_Type type, uint8 *data,
  25                            uint32 size, uint32 length)
  26 {
  27         struct registry_value *value;
  28         WERROR err;
  29
  30         if (!(value = TALLOC_ZERO_P(mem_ctx, struct registry_value))) {
  31                 return WERR_NOMEM;
  32         }
  33
  34         value->type = type;
  35
  36         switch (type) {
  37         case REG_DWORD:
  38                 if ((size != 4) || (length != 4)) {
  39                         err = WERR_INVALID_PARAM;
  40                         goto error;
  41                 }
  42                 value->v.dword = IVAL(data, 0);
  43                 break;
  44         case REG_SZ:
  45         case REG_EXPAND_SZ:
  46         {
  47                 /*
  48                  * Make sure we get a NULL terminated string for
  49                  * convert_string_talloc().
  50                  */
  51
  52                 smb_ucs2_t *tmp;
  53
  54                 if (length == 1) {
  55                         /* win2k regedit gives us a string of 1 byte when
  56                          * creating a new value of type REG_SZ. this workaround
  57                          * replaces the input by using the same string as
  58                          * winxp delivers. */
  59                         length = 2;
  60                         if (!(tmp = SMB_MALLOC_ARRAY(smb_ucs2_t, 2))) {
  61                                 err = WERR_NOMEM;
  62                                 goto error;
  63                         }
  64                         tmp[0] = 2;
  65                         tmp[1] = 0;
  66                 }
  67                 else if ((length % 2) != 0) {
  68                         err = WERR_INVALID_PARAM;
  69                         goto error;
  70                 }
  71                 else {
  72                         uint32 num_ucs2 = length / 2;
  73                         if (!(tmp = SMB_MALLOC_ARRAY(smb_ucs2_t, num_ucs2+1))) {
  74                                 err = WERR_NOMEM;
  75                                 goto error;
  76                         }
  77
  78                         memcpy((void *)tmp, (const void *)data, length);
  79                         tmp[num_ucs2] = 0;
  80                 }
  81
  82                 if (length + 2 < length) {
  83                         /* Integer wrap. */
  84                         SAFE_FREE(tmp);
  85                         err = WERR_INVALID_PARAM;
  86                         goto error;
  87                 }
  88
  89                 value->v.sz.len = convert_string_talloc(
  90                         value, CH_UTF16LE, CH_UNIX, tmp, length+2,
  91                         &value->v.sz.str, False);
  92
  93                 SAFE_FREE(tmp);
  94
  95                 if (value->v.sz.len == (size_t)-1) {
  96                         err = WERR_INVALID_PARAM;
  97                         goto error;
  98                 }
  99                 break;
 100         }
 101         case REG_MULTI_SZ:
 102                 err = reg_pull_multi_sz(value, (void *)data, length,
 103                                         &value->v.multi_sz.num_strings,
 104                                         &value->v.multi_sz.strings);
 105                 if (!(W_ERROR_IS_OK(err))) {
 106                         goto error;
 107                 }
 108                 break;
 109         case REG_BINARY:
 110                 value->v.binary = data_blob_talloc(mem_ctx, data, length);
 111                 break;
 112         default:
 113                 err = WERR_INVALID_PARAM;
 114                 goto error;
 115         }
 116
 117         *pvalue = value;
 118         return WERR_OK;
 119
 120  error:
 121         TALLOC_FREE(value);
 122         return err;
 123 }
 124
 125 WERROR registry_push_value(TALLOC_CTX *mem_ctx,
 126                            const struct registry_value *value,
 127                            DATA_BLOB *presult)
 128 {
 129         switch (value->type) {
 130         case REG_DWORD: {
 131                 char buf[4];
 132                 SIVAL(buf, 0, value->v.dword);
 133                 *presult = data_blob_talloc(mem_ctx, (void *)buf, 4);
 134                 if (presult->data == NULL) {
 135                         return WERR_NOMEM;
 136                 }
 137                 break;
 138         }
 139         case REG_SZ:
 140         case REG_EXPAND_SZ: {
 141                 presult->length = convert_string_talloc(
 142                         mem_ctx, CH_UNIX, CH_UTF16LE, value->v.sz.str,
 143                         MIN(value->v.sz.len, strlen(value->v.sz.str)+1),
 144                         (void *)&(presult->data), False);
 145                 if (presult->length == (size_t)-1) {
 146                         return WERR_NOMEM;
 147                 }
 148                 break;
 149         }
 150         case REG_BINARY:
 151                 *presult = data_blob_talloc(mem_ctx,
 152                                             value->v.binary.data,
 153                                             value->v.binary.length);
 154                 break;
 155         default:
 156                 return WERR_INVALID_PARAM;
 157         }
 158
 159         return WERR_OK;
 160 }