/* 
   Unix SMB/CIFS implementation.
   Transparent registry backend handling
   Copyright (C) Jelmer Vernooij			2003-2004.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "lib/registry/registry.h"
#include "librpc/gen_ndr/winreg.h"

/**
 * @file
 * @brief Registry utility functions
 */

static const struct {
	uint32_t id;
	const char *name;
} reg_value_types[] = {
	{ REG_SZ, "REG_SZ" },
	{ REG_DWORD, "REG_DWORD" },
	{ REG_BINARY, "REG_BINARY" },
	{ REG_EXPAND_SZ, "REG_EXPAND_SZ" },
	{ REG_NONE, "REG_NONE" },
	{ 0, NULL }
};

/** Return string description of registry value type */
_PUBLIC_ const char *str_regtype(int type)
{
	int i;
	for (i = 0; reg_value_types[i].name; i++) {
		if (reg_value_types[i].id == type) 
			return reg_value_types[i].name;
	}

	return "Unknown";
}

_PUBLIC_ char *reg_val_data_string(TALLOC_CTX *mem_ctx, uint32_t type, DATA_BLOB *data)
{ 
  char *ret = NULL;

  if(data->length == 0) return talloc_strdup(mem_ctx, "");

  switch (type) {
  case REG_EXPAND_SZ:
  case REG_SZ:
      convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX, data->data, data->length, (void **)&ret);
	  return ret;

  case REG_BINARY:
	  ret = data_blob_hex_string(mem_ctx, data);
	  return ret;

  case REG_DWORD:
	  if (*(int *)data->data == 0)
		  return talloc_strdup(mem_ctx, "0");

	  return talloc_asprintf(mem_ctx, "0x%x", *(int *)data->data);

  case REG_MULTI_SZ:
	/* FIXME */
    break;

  default:
    break;
  } 

  return ret;
}

/** Generate a string that describes a registry value */
_PUBLIC_ char *reg_val_description(TALLOC_CTX *mem_ctx, struct registry_value *val) 
{
	return talloc_asprintf(mem_ctx, "%s = %s : %s", val->name?val->name:"<No Name>", str_regtype(val->data_type), reg_val_data_string(mem_ctx, val->data_type, &val->data));
}

_PUBLIC_ BOOL reg_string_to_val(TALLOC_CTX *mem_ctx, const char *type_str, const char *data_str, uint32_t *type, DATA_BLOB *data)
{
	int i;
	*type = -1;

	/* Find the correct type */
	for (i = 0; reg_value_types[i].name; i++) {
		if (!strcmp(reg_value_types[i].name, type_str)) {
			*type = reg_value_types[i].id;
			break;
		}
	}

	if (*type == -1) 
		return False;

	/* Convert data appropriately */

	switch (*type) 
	{
		case REG_SZ:
		case REG_EXPAND_SZ:
      		data->length = convert_string_talloc(mem_ctx, CH_UNIX, CH_UTF16, data_str, strlen(data_str), (void **)&data->data);
			break;

		case REG_DWORD: {
			uint32_t tmp = strtol(data_str, NULL, 0);
			*data = data_blob_talloc(mem_ctx, &tmp, 4);
			}
			break;

		case REG_NONE:
			ZERO_STRUCTP(data);
			break;
	
		case REG_BINARY: 
			*data = strhex_to_data_blob(data_str);
			talloc_steal(mem_ctx, data->data);
			break;
			
		default:
			/* FIXME */
			return False;
	}
	return True;
}

/**
 * Replace all \'s with /'s
 */
char *reg_path_win2unix(char *path) 
{
	int i;
	for(i = 0; path[i]; i++) {
		if(path[i] == '\\') path[i] = '/';
	}
	return path;
}
/**
 * Replace all /'s with \'s
 */
char *reg_path_unix2win(char *path) 
{
	int i;
	for(i = 0; path[i]; i++) {
		if(path[i] == '/') path[i] = '\\';
	}
	return path;
}

/** Open a key by name (including the predefined key name!) */
WERROR reg_open_key_abs(TALLOC_CTX *mem_ctx, struct registry_context *handle, const char *name, struct registry_key **result)
{
	struct registry_key *predef;
	WERROR error;
	int predeflength;
	char *predefname;

	if(strchr(name, '\\')) predeflength = strchr(name, '\\')-name;
	else predeflength = strlen(name);

	predefname = talloc_strndup(mem_ctx, name, predeflength);
	error = reg_get_predefined_key_by_name(handle, predefname, &predef);
	talloc_free(predefname);

	if(!W_ERROR_IS_OK(error)) {
		return error;
	}

	if (strchr(name, '\\')) {
		return reg_open_key(mem_ctx, predef, strchr(name, '\\')+1, result);
	} else {
		*result = predef;
		return WERR_OK;
	}
}

static WERROR get_abs_parent(TALLOC_CTX *mem_ctx, struct registry_context *ctx, const char *path, struct registry_key **parent, const char **name)
{
	char *parent_name;
	WERROR error;
	
	if (strchr(path, '\\') == NULL) {
		return WERR_FOOBAR;
	}
	
	parent_name = talloc_strndup(mem_ctx, path, strrchr(path, '\\')-1-path);

	error = reg_open_key_abs(mem_ctx, ctx, parent_name, parent);
	if (!W_ERROR_IS_OK(error)) {
		return error;
	}
	
	*name = talloc_strdup(mem_ctx, strchr(path, '\\')+1);

	return WERR_OK;
}

WERROR reg_key_del_abs(struct registry_context *ctx, const char *path)
{
	struct registry_key *parent;
	const char *n;
	TALLOC_CTX *mem_ctx = talloc_init("reg_key_del_abs");
	WERROR error;
	
	if (!strchr(path, '\\')) {
		return WERR_FOOBAR;
	}
	
	error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
	if (W_ERROR_IS_OK(error)) {
		error = reg_key_del(parent, n);
	}

	talloc_free(mem_ctx);

	return error;
}

WERROR reg_key_add_abs(TALLOC_CTX *mem_ctx, struct registry_context *ctx, const char *path, uint32_t access_mask, struct security_descriptor *sec_desc, struct registry_key **result)
{
	struct registry_key *parent;
	const char *n;
	WERROR error;
	
	if (!strchr(path, '\\')) {
		return WERR_FOOBAR;
	}
	
	error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
	if (W_ERROR_IS_OK(error)) {
		error = reg_key_add_name(mem_ctx, parent, n, access_mask, sec_desc, result);
	}

	return error;
}