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/*
Copyright (c) 2003 Malte Starostik <[email protected]>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <netdb.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <arpa/nameser.h>
#ifdef HAVE_ARPA_NAMESER8_COMPAT_H
#include <arpa/nameser8_compat.h>
#endif
#ifdef HAVE_SYS_PARAM_H
// Basically, the BSDs need this before resolv.h
#include <sys/param.h>
#endif
#include <resolv.h>
#include <sys/utsname.h>
#include <tqtimer.h>
#include <klocale.h>
#include <kprocio.h>
#include <kurl.h>
#include "discovery.moc"
namespace KPAC
{
Discovery::Discovery( TQObject* parent )
: Downloader( parent ),
m_helper( new KProcIO )
{
connect( m_helper, TQT_SIGNAL( readReady( KProcIO* ) ), TQT_SLOT( helperOutput() ) );
connect( m_helper, TQT_SIGNAL( processExited( KProcess* ) ), TQT_SLOT( failed() ) );
*m_helper << "kpac_dhcp_helper";
if ( !m_helper->start() )
TQTimer::singleShot( 0, this, TQT_SLOT( failed() ) );
}
bool Discovery::initHostName()
{
struct utsname uts;
if (uname (&uts) > -1)
{
struct hostent *hent = gethostbyname (uts.nodename);
if (hent != 0)
m_hostname = TQString::fromLocal8Bit( hent->h_name );
}
// If no hostname, try gethostname as a last resort.
if (m_hostname.isEmpty())
{
char buf [256];
if (gethostname (buf, sizeof(buf)) == 0)
{
buf[255] = '\0';
m_hostname = TQString::fromLocal8Bit( buf );
}
}
return !m_hostname.isEmpty();
}
bool Discovery::checkDomain() const
{
// If a domain has a SOA record, don't traverse any higher.
// Returns true if no SOA can be found (domain is "ok" to use)
// Stick to old resolver interface for portability reasons.
union
{
HEADER header;
unsigned char buf[ PACKETSZ ];
} response;
int len = res_query( m_hostname.local8Bit(), C_IN, T_SOA,
response.buf, sizeof( response.buf ) );
if ( len <= int( sizeof( response.header ) ) ||
ntohs( response.header.ancount ) != 1 ) return true;
unsigned char* pos = response.buf + sizeof( response.header );
unsigned char* end = response.buf + len;
// skip query section
pos += dn_skipname( pos, end ) + QFIXEDSZ;
if ( pos >= end ) return true;
// skip answer domain
pos += dn_skipname( pos, end );
short type;
GETSHORT( type, pos );
return type != T_SOA;
}
void Discovery::failed()
{
setError( i18n( "Could not find a usable proxy configuration script" ) );
// If this is the first DNS query, initialize our host name or abort
// on failure. Otherwise abort if the current domain (which was already
// queried for a host called "wpad" contains a SOA record)
bool firstQuery = m_hostname.isEmpty();
if ( ( firstQuery && !initHostName() ) ||
( !firstQuery && !checkDomain() ) )
{
emit result( false );
return;
}
int dot = m_hostname.find( '.' );
if ( dot >= 0 )
{
m_hostname.remove( 0, dot + 1 ); // remove one domain level
download( KURL( "http://wpad." + m_hostname + "./wpad.dat" ) );
}
else emit result( false );
}
void Discovery::helperOutput()
{
m_helper->disconnect( this );
TQString line;
m_helper->readln( line );
download( KURL( line.stripWhiteSpace() ) );
}
}
// vim: ts=4 sw=4 et
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