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 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] = 0;
  65                         tmp[1] = 0;
  66                         DEBUG(10, ("got REG_SZ value of length 1 - workaround "
  67                                    "activated.\n"));
  68                 }
  69                 else if ((length % 2) != 0) {
  70                         err = WERR_INVALID_PARAM;
  71                         goto error;
  72                 }
  73                 else {
  74                         uint32 num_ucs2 = length / 2;
  75                         if (!(tmp = SMB_MALLOC_ARRAY(smb_ucs2_t, num_ucs2+1))) {
  76                                 err = WERR_NOMEM;
  77                                 goto error;
  78                         }
  79
  80                         memcpy((void *)tmp, (const void *)data, length);
  81                         tmp[num_ucs2] = 0;
  82                 }
  83
  84                 if (length + 2 < length) {
  85                         /* Integer wrap. */
  86                         SAFE_FREE(tmp);
  87                         err = WERR_INVALID_PARAM;
  88                         goto error;
  89                 }
  90
  91                 value->v.sz.len = convert_string_talloc(
  92                         value, CH_UTF16LE, CH_UNIX, tmp, length+2,
  93                         &value->v.sz.str, False);
  94
  95                 SAFE_FREE(tmp);
  96
  97                 if (value->v.sz.len == (size_t)-1) {
  98                         err = WERR_INVALID_PARAM;
  99                         goto error;
 100                 }
 101                 break;
 102         }
 103         case REG_MULTI_SZ:
 104                 err = reg_pull_multi_sz(value, (void *)data, length,
 105                                         &value->v.multi_sz.num_strings,
 106                                         &value->v.multi_sz.strings);
 107                 if (!(W_ERROR_IS_OK(err))) {
 108                         goto error;
 109                 }
 110                 break;
 111         case REG_BINARY:
 112                 value->v.binary = data_blob_talloc(mem_ctx, data, 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         case REG_BINARY:
 153                 *presult = data_blob_talloc(mem_ctx,
 154                                             value->v.binary.data,
 155                                             value->v.binary.length);
 156                 break;
 157         default:
 158                 return WERR_INVALID_PARAM;
 159         }
 160
 161         return WERR_OK;
 162 }