summaryrefslogtreecommitdiffstats
path: root/desktop/source/deployment/misc/lockfile.cxx
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--desktop/source/deployment/misc/lockfile.cxx211
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: */