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discovery.cpp
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1 /*
2  Copyright (c) 2003 Malte Starostik <malte@kde.org>
3 
4  This library is free software; you can redistribute it and/or
5  modify it under the terms of the GNU Library General Public
6  License as published by the Free Software Foundation; either
7  version 2 of the License, or (at your option) any later version.
8 
9  This library is distributed in the hope that it will be useful,
10  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  Library General Public License for more details.
13 
14  You should have received a copy of the GNU Library General Public License
15  along with this library; see the file COPYING.LIB. If not, write to
16  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  Boston, MA 02110-1301, USA.
18 */
19 
20 
21 #include <config.h>
22 #include <config-kpac.h>
23 #include <netdb.h>
24 #include <unistd.h>
25 
26 #ifdef HAVE_SYS_TYPES_H
27 #include <sys/types.h>
28 #endif
29 #ifdef HAVE_NETINET_IN_H
30 #include <netinet/in.h>
31 #endif
32 #include <arpa/nameser.h>
33 #ifdef HAVE_ARPA_NAMESER8_COMPAT_H
34 #include <arpa/nameser8_compat.h>
35 #else
36 #ifdef HAVE_ARPA_NAMESER_COMPAT_H
37 #include <arpa/nameser_compat.h>
38 #endif
39 #endif
40 #ifdef HAVE_SYS_PARAM_H
41 // Basically, the BSDs need this before resolv.h
42 #include <sys/param.h>
43 #endif
44 
45 #include <resolv.h>
46 #include <sys/utsname.h>
47 
48 #include <QtCore/QTimer>
49 #include <QtNetwork/QHostInfo>
50 
51 #include <klocale.h>
52 #include <kurl.h>
53 #include <kstandarddirs.h>
54 #include <kprocess.h>
55 #include "discovery.moc"
56 
57 namespace KPAC
58 {
59  Discovery::Discovery( QObject* parent )
60  : Downloader( parent ),
61  m_helper( new KProcess(this) )
62  {
63  m_helper->setOutputChannelMode(KProcess::SeparateChannels);
64  connect( m_helper, SIGNAL(readyReadStandardOutput()), SLOT(helperOutput()) );
65  connect( m_helper, SIGNAL(finished(int,QProcess::ExitStatus)), SLOT(failed()) );
66  *m_helper << KStandardDirs::findExe("kpac_dhcp_helper");
67  m_helper->start();
68  if ( !m_helper->waitForStarted() )
69  QTimer::singleShot( 0, this, SLOT(failed()) );
70  }
71 
72  bool Discovery::initDomainName()
73  {
74  m_domainName = QHostInfo::localDomainName();
75  return !m_domainName.isEmpty();
76  }
77 
78  bool Discovery::checkDomain() const
79  {
80  // If a domain has a SOA record, don't traverse any higher.
81  // Returns true if no SOA can be found (domain is "ok" to use)
82  // Stick to old resolver interface for portability reasons.
83  union
84  {
85  HEADER header;
86  unsigned char buf[ PACKETSZ ];
87  } response;
88 
89  int len = res_query( m_domainName.toLocal8Bit(), C_IN, T_SOA,
90  response.buf, sizeof( response.buf ) );
91  if ( len <= int( sizeof( response.header ) ) ||
92  ntohs( response.header.ancount ) != 1 )
93  return true;
94 
95  unsigned char* pos = response.buf + sizeof( response.header );
96  unsigned char* end = response.buf + len;
97 
98  // skip query section
99  pos += dn_skipname( pos, end ) + QFIXEDSZ;
100  if ( pos >= end )
101  return true;
102 
103  // skip answer domain
104  pos += dn_skipname( pos, end );
105  short type;
106  GETSHORT( type, pos );
107  return type != T_SOA;
108  }
109 
110  void Discovery::failed()
111  {
112  setError( i18n( "Could not find a usable proxy configuration script" ) );
113 
114  // If this is the first DNS query, initialize our host name or abort
115  // on failure. Otherwise abort if the current domain (which was already
116  // queried for a host called "wpad" contains a SOA record)
117  const bool firstQuery = m_domainName.isEmpty();
118  if ( ( firstQuery && !initDomainName() ) ||
119  ( !firstQuery && !checkDomain() ) )
120  {
121  emit result( false );
122  return;
123  }
124 
125  const int dot = m_domainName.indexOf( '.' );
126  if ( dot > -1 || firstQuery )
127  {
128  QString address (QLatin1String("http://wpad."));
129  address += m_domainName;
130  address += QLatin1String ("/wpad.dat");
131  if ( dot > -1 )
132  m_domainName.remove (0, dot + 1); // remove one domain level
133  download( KUrl(address) );
134  return;
135  }
136 
137  emit result( false );
138  }
139 
140  void Discovery::helperOutput()
141  {
142  m_helper->disconnect( this );
143  const QByteArray line = m_helper->readLine();
144  const KUrl url( QString::fromLocal8Bit(line.constData(), line.length()).trimmed() );
145  download( url );
146  }
147 }
148 
149 // vim: ts=4 sw=4 et
i18n
QString i18n(const char *text)
KProcess
header
const char header[]
kurl.h
KProcess::setOutputChannelMode
void setOutputChannelMode(OutputChannelMode mode)
QString
QObject
klocale.h
KPAC::Discovery::failed
virtual void failed()
Definition: discovery.cpp:110
KUrl
kprocess.h
KPAC::Downloader
Definition: downloader.h:33
KPAC::Downloader::setError
void setError(const QString &)
Definition: downloader.cpp:58
KProcess::start
void start()
KPAC::Discovery::Discovery
Discovery(QObject *)
Definition: discovery.cpp:59
KPAC::Downloader::download
void download(const KUrl &)
Definition: downloader.cpp:39
KPAC::Downloader::result
void result(bool)
kstandarddirs.h
KProcess::SeparateChannels
KStandardDirs::findExe
static QString findExe(const QString &appname, const QString &pathstr=QString(), SearchOptions options=NoSearchOptions)
end
const KShortcut & end()
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