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Diffstat (limited to 'desktop/source/deployment/misc/lockfile.cxx')
| -rw-r--r-- | desktop/source/deployment/misc/lockfile.cxx | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/desktop/source/deployment/misc/lockfile.cxx b/desktop/source/deployment/misc/lockfile.cxx new file mode 100644 index 000000000..206da8286 --- /dev/null +++ b/desktop/source/deployment/misc/lockfile.cxx @@ -0,0 +1,211 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <sal/config.h> + +#include <memory> + +#include <time.h> +#ifndef _WIN32 +#include <unistd.h> +#else +#if !defined WIN32_LEAN_AND_MEAN +# define WIN32_LEAN_AND_MEAN +#endif +#include <windows.h> +#endif +#include <comphelper/random.hxx> +#include <sal/types.h> +#include <osl/file.hxx> +#include <osl/security.hxx> +#include <unotools/bootstrap.hxx> +#include <tools/config.hxx> + +#include <lockfile.hxx> + +using namespace ::osl; +using namespace ::utl; + + +static OString impl_getHostname() +{ + OString aHost; +#ifdef _WIN32 + /* + prevent windows from connecting to the net to get its own + hostname by using the netbios name + */ + DWORD sz = MAX_COMPUTERNAME_LENGTH + 1; + TCHAR szHost[MAX_COMPUTERNAME_LENGTH + 1]; + if (GetComputerNameA(szHost, &sz)) + aHost = OString(szHost); + else + aHost = OString("UNKNOWN"); +#else + /* Don't do dns lookup on Linux either */ + char pHostName[1024]; + + if ( gethostname( pHostName, sizeof( pHostName ) - 1 ) == 0 ) + { + pHostName[sizeof( pHostName ) - 1] = '\0'; + aHost = OString( pHostName ); + } + else + aHost = OString("UNKNOWN"); +#endif + + return aHost; +} + +namespace desktop { + + Lockfile::Lockfile( bool bIPCserver ) + :m_bIPCserver(bIPCserver) + ,m_bRemove(false) + ,m_bIsLocked(false) + { + // build the file-url to use for the lock + OUString aUserPath; + utl::Bootstrap::locateUserInstallation( aUserPath ); + m_aLockname = aUserPath + "/.lock"; + + // generate ID + const int nIdBytes = 16; + char tmpId[nIdBytes*2+1]; + time_t t = time(nullptr); + for (int i = 0; i<nIdBytes; i++) { + int tmpByte = comphelper::rng::uniform_int_distribution(0, 0xFF); + sprintf( tmpId+i*2, "%02X", tmpByte ); + } + tmpId[nIdBytes*2]=0x00; + m_aId = OUString::createFromAscii( tmpId ); + + // generate date string + char *tmpTime = ctime( &t ); + if (tmpTime != nullptr) { + m_aDate = OUString::createFromAscii( tmpTime ); + sal_Int32 i = m_aDate.indexOf('\n'); + if (i > 0) + m_aDate = m_aDate.copy(0, i); + } + + + // try to create file + File aFile(m_aLockname); + if (aFile.open( osl_File_OpenFlag_Create ) == File::E_EXIST) { + m_bIsLocked = true; + } else { + // new lock created + aFile.close( ); + syncToFile( ); + m_bRemove = true; + } + } + + bool Lockfile::check( fpExecWarning execWarning ) + { + + if (m_bIsLocked) { + // lock existed, ask user what to do + if (isStale() || + (execWarning != nullptr && (*execWarning)( this ))) { + // remove file and create new + File::remove( m_aLockname ); + File aFile(m_aLockname); + (void)aFile.open( osl_File_OpenFlag_Create ); + aFile.close( ); + syncToFile( ); + m_bRemove = true; + return true; + } else { + //leave alone and return false + m_bRemove = false; + return false; + } + } else { + // lock was created by us + return true; + } + } + + bool Lockfile::isStale() const + { + // this checks whether the lockfile was created on the same + // host by the same user. Should this be the case it is safe + // to assume that it is a stale lockfile which can be overwritten + OUString aLockname = m_aLockname; + Config aConfig(aLockname); + aConfig.SetGroup(LOCKFILE_GROUP); + OString aIPCserver = aConfig.ReadKey( LOCKFILE_IPCKEY ); + if (!aIPCserver.equalsIgnoreAsciiCase("true")) + return false; + + OString aHost = aConfig.ReadKey( LOCKFILE_HOSTKEY ); + OString aUser = aConfig.ReadKey( LOCKFILE_USERKEY ); + + // lockfile from same host? + OString myHost( impl_getHostname() ); + if (aHost == myHost) { + // lockfile by same UID + OUString myUserName; + Security aSecurity; + aSecurity.getUserName( myUserName ); + OString myUser(OUStringToOString(myUserName, RTL_TEXTENCODING_ASCII_US)); + if (aUser == myUser) + return true; + } + return false; + } + + void Lockfile::syncToFile() const + { + OUString aLockname = m_aLockname; + Config aConfig(aLockname); + aConfig.SetGroup(LOCKFILE_GROUP); + + // get information + OString aHost( impl_getHostname() ); + OUString aUserName; + Security aSecurity; + aSecurity.getUserName( aUserName ); + OString aUser = OUStringToOString( aUserName, RTL_TEXTENCODING_ASCII_US ); + OString aTime = OUStringToOString( m_aDate, RTL_TEXTENCODING_ASCII_US ); + OString aStamp = OUStringToOString( m_aId, RTL_TEXTENCODING_ASCII_US ); + + // write information + aConfig.WriteKey( LOCKFILE_USERKEY, aUser ); + aConfig.WriteKey( LOCKFILE_HOSTKEY, aHost ); + aConfig.WriteKey( LOCKFILE_STAMPKEY, aStamp ); + aConfig.WriteKey( LOCKFILE_TIMEKEY, aTime ); + aConfig.WriteKey( + LOCKFILE_IPCKEY, + m_bIPCserver ? OString("true") : OString("false") ); + aConfig.Flush( ); + } + + Lockfile::~Lockfile() + { + // unlock userdata by removing file + if ( m_bRemove ) + File::remove( m_aLockname ); + } +} + + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |