kio Library API Documentation

discovery.cpp

00001 /* 00002 Copyright (c) 2003 Malte Starostik <malte@kde.org> 00003 00004 This library is free software; you can redistribute it and/or 00005 modify it under the terms of the GNU Library General Public 00006 License as published by the Free Software Foundation; either 00007 version 2 of the License, or (at your option) any later version. 00008 00009 This library is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 Library General Public License for more details. 00013 00014 You should have received a copy of the GNU Library General Public License 00015 along with this library; see the file COPYING.LIB. If not, write to 00016 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 00017 Boston, MA 02111-1307, USA. 00018 */ 00019 00020 00021 #include "config.h" 00022 00023 #include <netdb.h> 00024 00025 #ifdef HAVE_SYS_TYPES_H 00026 #include <sys/types.h> 00027 #endif 00028 #ifdef HAVE_NETINET_IN_H 00029 #include <netinet/in.h> 00030 #endif 00031 #include <arpa/nameser.h> 00032 #ifdef HAVE_ARPA_NAMESER8_COMPAT_H 00033 #include <arpa/nameser8_compat.h> 00034 #endif 00035 #ifdef HAVE_SYS_PARAM_H 00036 // Basically, the BSDs need this before resolv.h 00037 #include <sys/param.h> 00038 #endif 00039 #include <resolv.h> 00040 #include <sys/utsname.h> 00041 00042 #include <qtimer.h> 00043 00044 #include <klocale.h> 00045 #include <kprocio.h> 00046 #include <kurl.h> 00047 00048 #include "discovery.moc" 00049 00050 namespace KPAC 00051 { 00052 Discovery::Discovery( QObject* parent ) 00053 : Downloader( parent ), 00054 m_helper( new KProcIO ) 00055 { 00056 connect( m_helper, SIGNAL( readReady( KProcIO* ) ), SLOT( helperOutput() ) ); 00057 connect( m_helper, SIGNAL( processExited( KProcess* ) ), SLOT( failed() ) ); 00058 *m_helper << "kpac_dhcp_helper"; 00059 00060 if ( !m_helper->start() ) 00061 QTimer::singleShot( 0, this, SLOT( failed() ) ); 00062 } 00063 00064 bool Discovery::initHostName() 00065 { 00066 struct utsname uts; 00067 00068 if (uname (&uts) > -1) 00069 { 00070 struct hostent *hent = gethostbyname (uts.nodename); 00071 if (hent != 0) 00072 m_hostname = QString::fromLocal8Bit( hent->h_name ); 00073 } 00074 00075 // If no hostname, try gethostname as a last resort. 00076 if (m_hostname.isEmpty()) 00077 { 00078 char buf [256]; 00079 if (gethostname (buf, sizeof(buf)) == 0) 00080 { 00081 buf[255] = '\0'; 00082 m_hostname = QString::fromLocal8Bit( buf ); 00083 } 00084 } 00085 return !m_hostname.isEmpty(); 00086 } 00087 00088 bool Discovery::checkDomain() const 00089 { 00090 // If a domain has a SOA record, don't traverse any higher. 00091 // Returns true if no SOA can be found (domain is "ok" to use) 00092 // Stick to old resolver interface for portability reasons. 00093 union 00094 { 00095 HEADER header; 00096 unsigned char buf[ PACKETSZ ]; 00097 } response; 00098 int len = res_query( m_hostname.local8Bit(), C_IN, T_SOA, 00099 response.buf, sizeof( response.buf ) ); 00100 if ( len <= int( sizeof( response.header ) ) || 00101 ntohs( response.header.ancount ) != 1 ) return true; 00102 unsigned char* pos = response.buf + sizeof( response.header ); 00103 unsigned char* end = response.buf + len; 00104 // skip query section 00105 pos += dn_skipname( pos, end ) + QFIXEDSZ; 00106 if ( pos >= end ) return true; 00107 // skip answer domain 00108 pos += dn_skipname( pos, end ); 00109 short type; 00110 GETSHORT( type, pos ); 00111 return type != T_SOA; 00112 } 00113 00114 void Discovery::failed() 00115 { 00116 setError( i18n( "Could not find a usable proxy configuration script" ) ); 00117 00118 // If this is the first DNS query, initialize our host name or abort 00119 // on failure. Otherwise abort if the current domain (which was already 00120 // queried for a host called "wpad" contains a SOA record) 00121 bool firstQuery = m_hostname.isEmpty(); 00122 if ( ( firstQuery && !initHostName() ) || 00123 ( !firstQuery && !checkDomain() ) ) 00124 { 00125 emit result( false ); 00126 return; 00127 } 00128 00129 int dot = m_hostname.find( '.' ); 00130 if ( dot >= 0 ) 00131 { 00132 m_hostname.remove( 0, dot + 1 ); // remove one domain level 00133 download( KURL( "http://wpad." + m_hostname + "./wpad.dat" ) ); 00134 } 00135 else emit result( false ); 00136 } 00137 00138 void Discovery::helperOutput() 00139 { 00140 m_helper->disconnect( this ); 00141 QString line; 00142 m_helper->readln( line ); 00143 download( KURL( line.stripWhiteSpace() ) ); 00144 } 00145 } 00146 00147 // vim: ts=4 sw=4 et
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This file is part of the documentation for kio Library Version 3.3.0.
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