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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #include <stdlib.h>
21 : #include <time.h>
22 : #ifndef WNT
23 : #include <unistd.h>
24 : #else
25 : #include <windows.h>
26 : #endif
27 : #include <sal/types.h>
28 : #include <osl/file.hxx>
29 : #include <osl/socket.hxx>
30 : #include <osl/security.hxx>
31 : #include <unotools/bootstrap.hxx>
32 : #include <tools/string.hxx>
33 : #include <tools/config.hxx>
34 :
35 : #include "lockfile.hxx"
36 :
37 :
38 : using namespace ::osl;
39 : using namespace ::rtl;
40 : using namespace ::utl;
41 :
42 :
43 0 : static rtl::OString impl_getHostname()
44 : {
45 0 : rtl::OString aHost;
46 : #ifdef WNT
47 : /*
48 : prevent windows from connecting to the net to get it's own
49 : hostname by using the netbios name
50 : */
51 : sal_Int32 sz = MAX_COMPUTERNAME_LENGTH + 1;
52 : char* szHost = new char[sz];
53 : if (GetComputerName(szHost, (LPDWORD)&sz))
54 : aHost = OString(szHost);
55 : else
56 : aHost = OString("UNKNOWN");
57 : delete[] szHost;
58 : #else
59 : /* Don't do dns lookup on Linux either */
60 : sal_Char pHostName[1024];
61 :
62 0 : if ( gethostname( pHostName, sizeof( pHostName ) - 1 ) == 0 )
63 : {
64 0 : pHostName[sizeof( pHostName ) - 1] = '\0';
65 0 : aHost = OString( pHostName );
66 : }
67 : else
68 0 : aHost = OString("UNKNOWN");
69 : #endif
70 :
71 0 : return aHost;
72 : }
73 :
74 : namespace desktop {
75 :
76 0 : Lockfile::Lockfile( bool bIPCserver )
77 : :m_bIPCserver(bIPCserver)
78 : ,m_bRemove(sal_False)
79 0 : ,m_bIsLocked(sal_False)
80 : {
81 : // build the file-url to use for the lock
82 0 : OUString aUserPath;
83 0 : utl::Bootstrap::locateUserInstallation( aUserPath );
84 0 : m_aLockname = aUserPath + LOCKFILE_SUFFIX;
85 :
86 : // generate ID
87 0 : const int nIdBytes = 16;
88 : char tmpId[nIdBytes*2+1];
89 : time_t t;
90 0 : srand( (unsigned)(t = time( NULL )) );
91 0 : int tmpByte = 0;
92 0 : for (int i = 0; i<nIdBytes; i++) {
93 0 : tmpByte = rand( ) % 0xFF;
94 0 : sprintf( tmpId+i*2, "%02X", tmpByte );
95 : }
96 0 : tmpId[nIdBytes*2]=0x00;
97 0 : m_aId = OUString::createFromAscii( tmpId );
98 :
99 : // generate date string
100 0 : char *tmpTime = ctime( &t );
101 0 : if (tmpTime != NULL) {
102 0 : m_aDate = OUString::createFromAscii( tmpTime );
103 0 : sal_Int32 i = m_aDate.indexOf('\n');
104 0 : if (i > 0)
105 0 : m_aDate = m_aDate.copy(0, i);
106 : }
107 :
108 :
109 : // try to create file
110 0 : File aFile(m_aLockname);
111 0 : if (aFile.open( osl_File_OpenFlag_Create ) == File::E_EXIST) {
112 0 : m_bIsLocked = sal_True;
113 : } else {
114 : // new lock created
115 0 : aFile.close( );
116 0 : syncToFile( );
117 0 : m_bRemove = sal_True;
118 0 : }
119 0 : }
120 :
121 0 : sal_Bool Lockfile::check( fpExecWarning execWarning )
122 : {
123 :
124 0 : if (m_bIsLocked) {
125 : // lock existed, ask user what to do
126 0 : if (isStale() ||
127 0 : (execWarning != 0 && (*execWarning)( this ))) {
128 : // remove file and create new
129 0 : File::remove( m_aLockname );
130 0 : File aFile(m_aLockname);
131 0 : aFile.open( osl_File_OpenFlag_Create );
132 0 : aFile.close( );
133 0 : syncToFile( );
134 0 : m_bRemove = sal_True;
135 0 : return sal_True;
136 : } else {
137 : //leave alone and return false
138 0 : m_bRemove = sal_False;
139 0 : return sal_False;
140 : }
141 : } else {
142 : // lock was created by us
143 0 : return sal_True;
144 : }
145 : }
146 :
147 0 : sal_Bool Lockfile::isStale( void ) const
148 : {
149 : // this checks whether the lockfile was created on the same
150 : // host by the same user. Should this be the case it is safe
151 : // to assume that it is a stale lockfile which can be overwritten
152 0 : String aLockname = m_aLockname;
153 0 : Config aConfig(aLockname);
154 0 : aConfig.SetGroup(LOCKFILE_GROUP);
155 0 : rtl::OString aIPCserver = aConfig.ReadKey( LOCKFILE_IPCKEY );
156 0 : if (!aIPCserver.equalsIgnoreAsciiCase(rtl::OString("true")))
157 0 : return false;
158 :
159 0 : rtl::OString aHost = aConfig.ReadKey( LOCKFILE_HOSTKEY );
160 0 : rtl::OString aUser = aConfig.ReadKey( LOCKFILE_USERKEY );
161 :
162 : // lockfile from same host?
163 0 : rtl::OString myHost( impl_getHostname() );
164 0 : if (aHost == myHost) {
165 : // lockfile by same UID
166 0 : OUString myUserName;
167 0 : Security aSecurity;
168 0 : aSecurity.getUserName( myUserName );
169 0 : rtl::OString myUser(rtl::OUStringToOString(myUserName, RTL_TEXTENCODING_ASCII_US));
170 0 : if (aUser == myUser)
171 0 : return sal_True;
172 : }
173 0 : return sal_False;
174 : }
175 :
176 0 : void Lockfile::syncToFile( void ) const
177 : {
178 0 : String aLockname = m_aLockname;
179 0 : Config aConfig(aLockname);
180 0 : aConfig.SetGroup(LOCKFILE_GROUP);
181 :
182 : // get information
183 0 : rtl::OString aHost( impl_getHostname() );
184 0 : OUString aUserName;
185 0 : Security aSecurity;
186 0 : aSecurity.getUserName( aUserName );
187 0 : rtl::OString aUser = OUStringToOString( aUserName, RTL_TEXTENCODING_ASCII_US );
188 0 : rtl::OString aTime = OUStringToOString( m_aDate, RTL_TEXTENCODING_ASCII_US );
189 0 : rtl::OString aStamp = OUStringToOString( m_aId, RTL_TEXTENCODING_ASCII_US );
190 :
191 : // write information
192 0 : aConfig.WriteKey( LOCKFILE_USERKEY, aUser );
193 0 : aConfig.WriteKey( LOCKFILE_HOSTKEY, aHost );
194 0 : aConfig.WriteKey( LOCKFILE_STAMPKEY, aStamp );
195 0 : aConfig.WriteKey( LOCKFILE_TIMEKEY, aTime );
196 : aConfig.WriteKey(
197 : LOCKFILE_IPCKEY,
198 0 : m_bIPCserver ? rtl::OString("true") : rtl::OString("false") );
199 0 : aConfig.Flush( );
200 0 : }
201 :
202 0 : Lockfile::~Lockfile( void )
203 : {
204 : // unlock userdata by removing file
205 0 : if ( m_bRemove )
206 0 : File::remove( m_aLockname );
207 0 : }
208 : }
209 :
210 :
211 :
212 :
213 :
214 :
215 :
216 :
217 :
218 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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