reg_db.c

samba-3.0.22.tar.gz 编译smb服务器的源码

/* 
 *  Unix SMB/CIFS implementation.
 *  Virtual Windows Registry Layer
 *  Copyright (C) Gerald Carter                     2002-2005
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Implementation of internal registry database functions. */

#include "includes.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV

static TDB_CONTEXT *tdb_reg;
static int tdb_refcount;

#define VALUE_PREFIX	"SAMBA_REGVAL"

/* List the deepest path into the registry.  All part components will be created.*/

/* If you want to have a part of the path controlled by the tdb and part by
   a virtual registry db (e.g. printing), then you have to list the deepest path.
   For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print" 
   allows the reg_db backend to handle everything up to 
   "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook 
   the reg_printing backend onto the last component of the path (see 
   KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */

static const char *builtin_registry_paths[] = {
	KEY_PRINTING_2K,
	KEY_PRINTING_PORTS,
	KEY_PRINTING,
	KEY_SHARES,
	KEY_EVENTLOG,
	"HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib",
	"HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib\\009",
	"HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
	"HKLM\\SYSTEM\\CurrentControlSet\\Control\\ProductOptions",
	"HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
	"HKLM\\SYSTEM\\CurrentControlSet\\Services\\TcpIp\\Parameters",
	"HKLM\\SYSTEM\\CurrentControlSet\\Services\\Netlogon\\Parameters",
	"HKU",
	"HKCR",
	"HKPD",
	"HKPT",
	 NULL };

struct builtin_regkey_value {
	const char *path;
	const char *valuename;
	uint32 type;
	union {
		const char *string;
		uint32 dw_value;
	} data;
};

static struct builtin_regkey_value builtin_registry_values[] = {
	{ KEY_PRINTING_PORTS,
		SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
	{ KEY_PRINTING_2K,
		"DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
	{ KEY_EVENTLOG,
		"DisplayName", REG_SZ, { "Event Log" } }, 
	{ KEY_EVENTLOG,
		"ErrorControl", REG_DWORD, { (char*)0x00000001 } },
	{ NULL, NULL, 0, { NULL } }
};

#define REGVER_V1	1	/* first db version with write support */
	
/***********************************************************************
 Open the registry data in the tdb
 ***********************************************************************/
 
static BOOL init_registry_data( void )
{
	pstring path, base, remaining;
	fstring keyname, subkeyname;
	REGSUBKEY_CTR *subkeys;
	REGVAL_CTR *values;
	int i;
	const char *p, *p2;
	UNISTR2 data;
	
	/* loop over all of the predefined paths and add each component */
	
	for ( i=0; builtin_registry_paths[i] != NULL; i++ ) {

		DEBUG(6,("init_registry_data: Adding [%s]\n", builtin_registry_paths[i]));

		pstrcpy( path, builtin_registry_paths[i] );
		pstrcpy( base, "" );
		p = path;
		
		while ( next_token(&p, keyname, "\\", sizeof(keyname)) ) {
		
			/* build up the registry path from the components */
			
			if ( *base )
				pstrcat( base, "\\" );
			pstrcat( base, keyname );
			
			/* get the immediate subkeyname (if we have one ) */
			
			*subkeyname = '\0';
			if ( *p ) {
				pstrcpy( remaining, p );
				p2 = remaining;
				
				if ( !next_token(&p2, subkeyname, "\\", sizeof(subkeyname)) )
					fstrcpy( subkeyname, p2 );
			}

			DEBUG(10,("init_registry_data: Storing key [%s] with subkey [%s]\n",
				base, *subkeyname ? subkeyname : "NULL"));
			
			/* we don't really care if the lookup succeeds or not since
			   we are about to update the record.  We just want any 
			   subkeys already present */
			
			if ( !(subkeys = TALLOC_ZERO_P( NULL, REGSUBKEY_CTR )) ) {
				DEBUG(0,("talloc() failure!\n"));
				return False;
			}

			regdb_fetch_keys( base, subkeys );
			if ( *subkeyname ) 
				regsubkey_ctr_addkey( subkeys, subkeyname );
			if ( !regdb_store_keys( base, subkeys ))
				return False;
			
			TALLOC_FREE( subkeys );
		}
	}

	/* loop over all of the predefined values and add each component */
	
	for ( i=0; builtin_registry_values[i].path != NULL; i++ ) {
		if ( !(values = TALLOC_ZERO_P( NULL, REGVAL_CTR )) ) {
			DEBUG(0,("talloc() failure!\n"));
			return False;
		}

		regdb_fetch_values( builtin_registry_values[i].path, values );

		/* preserve existing values across restarts.  Only add new ones */

		if ( !regval_ctr_key_exists( values, builtin_registry_values[i].valuename ) ) 
		{
			switch( builtin_registry_values[i].type ) {
			case REG_DWORD:
				regval_ctr_addvalue( values, 
				                     builtin_registry_values[i].valuename,
						     REG_DWORD,
						     (char*)&builtin_registry_values[i].data.dw_value,
						     sizeof(uint32) );
				break;
				
			case REG_SZ:
				init_unistr2( &data, builtin_registry_values[i].data.string, UNI_STR_TERMINATE);
				regval_ctr_addvalue( values, 
				                     builtin_registry_values[i].valuename,
						     REG_SZ,
						     (char*)data.buffer,
						     data.uni_str_len*sizeof(uint16) );
				break;
			
			default:
				DEBUG(0,("init_registry_data: invalid value type in builtin_registry_values [%d]\n",
					builtin_registry_values[i].type));
			}
			regdb_store_values( builtin_registry_values[i].path, values );
		}
		
		TALLOC_FREE( values );
	}
	
	return True;
}

/***********************************************************************
 Open the registry database
 ***********************************************************************/
 
BOOL regdb_init( void )
{
	const char *vstring = "INFO/version";
	uint32 vers_id;

	if ( tdb_reg )
		return True;

	if ( !(tdb_reg = tdb_open_log(lock_path("registry.tdb"), 0, TDB_DEFAULT, O_RDWR, 0600)) )
	{
		tdb_reg = tdb_open_log(lock_path("registry.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
		if ( !tdb_reg ) {
			DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
				lock_path("registry.tdb"), strerror(errno) ));
			return False;
		}
		
		DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
	}

	tdb_refcount = 1;
		

	vers_id = tdb_fetch_int32(tdb_reg, vstring);

	if ( vers_id != REGVER_V1 ) {
		/* any upgrade code here if needed */
	}

	/* always setup the necessary keys and values */

	if ( !init_registry_data() ) {
		DEBUG(0,("init_registry: Failed to initiailize data in registry!\n"));
		return False;
	}

	return True;
}

/***********************************************************************
 Open the registry.  Must already have been initialized by regdb_init()
 ***********************************************************************/

WERROR regdb_open( void )
{
	WERROR result = WERR_OK;

	if ( tdb_reg ) {
		DEBUG(10,("regdb_open: incrementing refcount (%d)\n", tdb_refcount));
		tdb_refcount++;
		return WERR_OK;
	}
	
	become_root();

	tdb_reg = tdb_open_log(lock_path("registry.tdb"), 0, TDB_DEFAULT, O_RDWR, 0600);
	if ( !tdb_reg ) {
		result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
		DEBUG(0,("regdb_open: Failed to open %s! (%s)\n", 
			lock_path("registry.tdb"), strerror(errno) ));
	}

	unbecome_root();

	tdb_refcount = 1;
	DEBUG(10,("regdb_open: refcount reset (%d)\n", tdb_refcount));

	return result;
}

/***********************************************************************
 ***********************************************************************/

int regdb_close( void )
{
	int ret;

	tdb_refcount--;

	DEBUG(10,("regdb_close: decrementing refcount (%d)\n", tdb_refcount));

	if ( tdb_refcount > 0 )
		return 0;

	SMB_ASSERT( tdb_refcount >= 0 );

	ret = tdb_close( tdb_reg );
	tdb_reg = NULL;

	return ret;
}

/***********************************************************************
 Add subkey strings to the registry tdb under a defined key
 fmt is the same format as tdb_pack except this function only supports
 fstrings
 ***********************************************************************/
 
static BOOL regdb_store_keys_internal( const char *key, REGSUBKEY_CTR *ctr )
{
	TDB_DATA kbuf, dbuf;
	char *buffer, *tmpbuf;
	int i = 0;
	uint32 len, buflen;
	BOOL ret = True;
	uint32 num_subkeys = regsubkey_ctr_numkeys( ctr );
	pstring keyname;
	
	if ( !key )
		return False;

	pstrcpy( keyname, key );
	normalize_reg_path( keyname );

	/* allocate some initial memory */
		
	buffer = SMB_MALLOC(sizeof(pstring));
	buflen = sizeof(pstring);