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KDECore

ksrvresolverworker.cpp

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00001 /*  -*- C++ -*-
00002  *  Copyright (C) 2005 Thiago Macieira <thiago@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., 51 Franklin Street, Fifth Floor,
00017  *  Boston, MA 02110-1301, USA.
00018  */
00019 
00020 #include <config.h>
00021 
00022 #include "ksrvresolverworker_p.h"
00023 
00024 #include <sys/types.h>
00025 #include <sys/socket.h>
00026 #include <stdlib.h>
00027 
00028 #include <qapplication.h>
00029 #include <qevent.h>
00030 
00031 using namespace KNetwork;
00032 using namespace KNetwork::Internal;
00033 
00034 namespace 
00035 {
00036   struct KSrvStartEvent: public QCustomEvent
00037   {
00038     inline KSrvStartEvent() : QCustomEvent(QEvent::User) { }
00039   };
00040 }
00041 
00042 static void sortPriorityClass(KSrvResolverWorker::PriorityClass&)
00043 {
00044   // do nothing
00045 }
00046 
00047 bool KSrvResolverWorker::preprocess()
00048 {
00049   // check if the resolver flags mention SRV-based lookup
00050   if ((flags() & (KResolver::NoSrv | KResolver::UseSrv)) != KResolver::UseSrv)
00051     return false;
00052 
00053   QString node = nodeName();
00054   if (node.find('%') != -1)
00055     node.truncate(node.find('%'));
00056 
00057   if (node.isEmpty() || node == QString::fromLatin1("*") ||
00058       node == QString::fromLatin1("localhost"))
00059     return false;       // empty == localhost
00060 
00061   encodedName = KResolver::domainToAscii(node);
00062   if (encodedName.isNull())
00063     return false;
00064 
00065   // we only work with Internet-based families
00066   if ((familyMask() & KResolver::InternetFamily) == 0)
00067     return false;
00068 
00069   // SRV-based resolution only works if the service isn't numeric
00070   bool ok;
00071   serviceName().toUInt(&ok);
00072   if (ok)
00073     return false;       // it is numeric
00074 
00075   // check the protocol for something we know
00076   QCString protoname;
00077   int sockettype = socketType();
00078   if (!protocolName().isEmpty())
00079     protoname = protocolName();
00080   else if (protocol() != 0)
00081     {
00082       QStrList names = KResolver::protocolName(protocol());
00083       names.setAutoDelete(true);
00084       if (names.isEmpty())
00085     return false;
00086 
00087       protoname = "_";
00088       protoname += names.at(0);
00089     }
00090   else if (sockettype == SOCK_STREAM || sockettype == 0)
00091     protoname = "_tcp";
00092   else if (sockettype == SOCK_DGRAM)
00093     protoname = "_udp";
00094   else
00095     return false;       // unknown protocol and socket type
00096 
00097   encodedName.prepend(".");
00098   encodedName.prepend(protoname);
00099   encodedName.prepend(".");
00100   encodedName.prepend(serviceName().latin1());
00101   encodedName.prepend("_");
00102 
00103   // looks like something we could process
00104   return true;
00105 }
00106 
00107 bool KSrvResolverWorker::run()
00108 {
00109   sem = new QSemaphore(1);
00110   // zero out
00111   sem->tryAccess(sem->available());
00112 
00113   QApplication::postEvent(this, new KSrvStartEvent);
00114 
00115   // block
00116   (*sem)++;
00117   delete sem;
00118   sem = 0L;
00119 
00120   if (rawResults.isEmpty())
00121     {
00122       // normal lookup
00123       KResolver *r = new KResolver(nodeName(), serviceName());
00124       r->setFlags(flags() | KResolver::NoSrv);
00125       r->setFamily(familyMask());
00126       r->setSocketType(socketType());
00127       r->setProtocol(protocol(), protocolName());
00128 
00129       enqueue(r);
00130 
00131       Entry e;
00132       PriorityClass cl;
00133       e.resolver = r;
00134       cl.entries.append(e);
00135       myResults[0] = cl;
00136 
00137       return true;
00138     }
00139   else if (rawResults.count() == 1 && rawResults.first().name == ".")
00140     {
00141       // no name
00142       setError(KResolver::NoName);
00143       finished();
00144       return true;
00145     }
00146   else
00147     {
00148       // now process the results
00149       QValueList<QDns::Server>::ConstIterator it = rawResults.begin();
00150       while (it != rawResults.end())
00151     {
00152       const QDns::Server& srv = *it;
00153       PriorityClass& r = myResults[srv.priority];
00154       r.totalWeight += srv.weight;
00155 
00156       Entry e;
00157       e.name = srv.name;
00158       e.port = srv.port;
00159       e.weight = srv.weight;
00160       e.resolver = 0L;
00161       r.entries.append(e);
00162 
00163       ++it;
00164     }
00165       rawResults.clear();   // free memory
00166 
00167       Results::Iterator mapit;
00168       for (mapit = myResults.begin(); mapit != myResults.end(); ++mapit)
00169     {
00170       // sort the priority
00171       sortPriorityClass(*mapit);
00172 
00173       QValueList<Entry>& entries = (*mapit).entries;
00174 
00175       // start the resolvers
00176       for (QValueList<Entry>::Iterator it = entries.begin();
00177            it != entries.end(); ++it)
00178         {
00179           Entry &e = *it;
00180 
00181           KResolver* r = new KResolver(e.name, QString::number(e.port));
00182           r->setFlags(flags() | KResolver::NoSrv);
00183           r->setFamily(familyMask());
00184           r->setSocketType(socketType());
00185           r->setProtocol(protocol(), protocolName());
00186 
00187           enqueue(r);
00188           e.resolver = r;
00189         }
00190     }
00191 
00192       return true;
00193     }
00194 }
00195 
00196 bool KSrvResolverWorker::postprocess()
00197 {
00198   setError(KResolver::NoName);
00199   if (myResults.isEmpty())
00200     return false;
00201 
00202   Results::Iterator mapit, mapend;
00203   for (mapit = myResults.begin(), mapend = myResults.end();
00204        mapit != mapend; ++mapit)
00205     {
00206       QValueList<Entry>::Iterator it = (*mapit).entries.begin(),
00207     end = (*mapit).entries.end();
00208       for ( ; it != end; ++it)
00209     {
00210       Entry &e = *it;
00211       KResolverResults r = e.resolver->results();
00212       if (r.isEmpty() && results.isEmpty())
00213         setError(r.error(), r.systemError());
00214       else
00215         {
00216           setError(KResolver::NoError);
00217           results += r;
00218         }
00219     }
00220     }
00221 
00222   finished();
00223   return true;
00224 }
00225 
00226 void KSrvResolverWorker::customEvent(QCustomEvent*)
00227 {
00228   dns = new QDns(QString::fromLatin1(encodedName), QDns::Srv);
00229   QObject::connect(dns, SIGNAL(resultsReady()), this, SLOT(dnsResultsReady()));
00230 }
00231 
00232 void KSrvResolverWorker::dnsResultsReady()
00233 {
00234   (*sem)--;
00235   rawResults = dns->servers();
00236   dns->deleteLater();
00237   dns = 0L;
00238 }
00239 
00240 namespace KNetwork
00241 {
00242   namespace Internal
00243   {
00244 
00245     void initSrvWorker() KDE_NO_EXPORT;
00246     void initSrvWorker()
00247     {
00248       if (getenv("KDE_NO_SRV") != NULL)
00249     return;
00250       
00251       KResolverWorkerFactoryBase::registerNewWorker(new KResolverWorkerFactory<KSrvResolverWorker>);
00252     }
00253     
00254   }
00255 }
00256 
00257 #include "ksrvresolverworker_p.moc"

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