summaryrefslogtreecommitdiff
path: root/desktop/source/app/lockfile.cxx
blob: db23c7db195a179922be77c27d4bbcd2fd3f5fc2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_desktop.hxx"
#include <stdlib.h>
#include <time.h>
#ifdef WNT
#include <tools/prewin.h>
#include <windows.h>
#include <tools/postwin.h>
#else
#include <unistd.h>
#endif
#include <sal/types.h>
#include <osl/file.hxx>
#include <osl/socket.hxx>
#include <osl/security.hxx>
#include <unotools/bootstrap.hxx>
#include <tools/string.hxx>
#include <tools/config.hxx>

#include "lockfile.hxx"


using namespace ::osl;
using namespace ::rtl;
using namespace ::utl;


static rtl::OString impl_getHostname()
{
    rtl::OString aHost;
#ifdef WNT
    /*
       prevent windows from connecting to the net to get it's own
       hostname by using the netbios name
       */
    sal_Int32 sz = MAX_COMPUTERNAME_LENGTH + 1;
    char* szHost = new char[sz];
    if (GetComputerName(szHost, (LPDWORD)&sz))
        aHost = OString(szHost);
    else
        aHost = OString("UNKNOWN");
    delete[] szHost;
#else
    /* Don't do dns lookup on Linux either */
    sal_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(sal_False)
    ,m_bIsLocked(sal_False)
    {
        // build the file-url to use for the lock
        OUString aUserPath;
        utl::Bootstrap::locateUserInstallation( aUserPath );
        m_aLockname = aUserPath + LOCKFILE_SUFFIX;

        // generate ID
        const int nIdBytes = 16;
        char tmpId[nIdBytes*2+1];
        time_t t;
        srand( (unsigned)(t = time( NULL )) );
        int tmpByte = 0;
        for (int i = 0; i<nIdBytes; i++) {
            tmpByte = rand( ) % 0xFF;
            sprintf( tmpId+i*2, "%02X", tmpByte ); // #100211# - checked
        }
        tmpId[nIdBytes*2]=0x00;
        m_aId = OUString::createFromAscii( tmpId );

        // generate date string
        char *tmpTime = ctime( &t );
        if (tmpTime != NULL) {
            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( OpenFlag_Create ) == File::E_EXIST) {
            m_bIsLocked = sal_True;
        } else {
            // new lock created
            aFile.close( );
            syncToFile( );
            m_bRemove = sal_True;
        }
    }

    sal_Bool Lockfile::check( fpExecWarning execWarning )
    {

        if (m_bIsLocked) {
            // lock existed, ask user what to do
            if (isStale() ||
                (execWarning != 0 && (*execWarning)( this ))) {
                // remove file and create new
                File::remove( m_aLockname );
                File aFile(m_aLockname);
                aFile.open( OpenFlag_Create );
                aFile.close( );
                syncToFile( );
                m_bRemove = sal_True;
                return sal_True;
            } else {
                //leave alone and return false
                m_bRemove = sal_False;
                return sal_False;
            }
        } else {
            // lock was created by us
            return sal_True;
        }
    }

    sal_Bool Lockfile::isStale( void ) 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
        String aLockname = m_aLockname;
        Config aConfig(aLockname);
        aConfig.SetGroup(LOCKFILE_GROUP);
        ByteString aIPCserver  = aConfig.ReadKey( LOCKFILE_IPCKEY );
        if (! aIPCserver.EqualsIgnoreCaseAscii( "true" ))
            return false;

        ByteString aHost  = aConfig.ReadKey( LOCKFILE_HOSTKEY );
        ByteString aUser  = aConfig.ReadKey( LOCKFILE_USERKEY );

        // lockfile from same host?
        ByteString myHost( impl_getHostname() );
        if (aHost == myHost) {
            // lockfile by same UID
            OUString myUserName;
            Security aSecurity;
            aSecurity.getUserName( myUserName );
            ByteString myUser  = OUStringToOString( myUserName, RTL_TEXTENCODING_ASCII_US );
            if (aUser == myUser)
                return sal_True;
        }
        return sal_False;
    }

    void Lockfile::syncToFile( void ) const
    {
        String aLockname = m_aLockname;
        Config aConfig(aLockname);
        aConfig.SetGroup(LOCKFILE_GROUP);

        // get information
        ByteString aHost( impl_getHostname() );
        OUString aUserName;
        Security aSecurity;
        aSecurity.getUserName( aUserName );
        ByteString aUser  = OUStringToOString( aUserName, RTL_TEXTENCODING_ASCII_US );		
        ByteString aTime  = OUStringToOString( m_aDate, RTL_TEXTENCODING_ASCII_US );
        ByteString 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 ? ByteString("true") : ByteString("false") );
        aConfig.Flush( );
    }

    void Lockfile::clean( void )
    {
        if ( m_bRemove )
        {
            File::remove( m_aLockname );
            m_bRemove = sal_False;
        }
    }

    Lockfile::~Lockfile( void )
    {
        // unlock userdata by removing file
        if ( m_bRemove )
            File::remove( m_aLockname );
    }
}









/* vim:set shiftwidth=4 softtabstop=4 expandtab: */