servicebrowser.cpp
/* This file is part of the KDE project
*
* Copyright (C) 2004 Jakub Stachowski <qbast@go2.pl>
*
* 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 <signal.h>
#include <errno.h>
#include <qstringlist.h>
#include <qfile.h>
#include "domainbrowser.h"
#include "query.h"
#include "servicebrowser.h"
#include <config.h>
#ifdef HAVE_DNSSD
#include <dns_sd.h>
#endif
#define MDNSD_PID "/var/run/mdnsd.pid"
namespace DNSSD
{
const QString ServiceBrowser::AllServices = "_services._dns-sd._udp";
class ServiceBrowserPrivate
{
public:
ServiceBrowserPrivate() : m_running(false)
{}
QValueList<RemoteService::Ptr> m_services;
QValueList<RemoteService::Ptr> m_duringResolve;
QStringList m_types;
DomainBrowser* m_domains;
int m_flags;
bool m_running;
bool m_finished;
QDict<Query> resolvers;
};
ServiceBrowser::ServiceBrowser(const QString& type,DomainBrowser* domains,bool autoResolve)
{
if (domains) init(type,domains,autoResolve ? AutoResolve : 0);
else init(type,new DomainBrowser(this),autoResolve ? AutoResolve|AutoDelete : AutoDelete);
}
ServiceBrowser::ServiceBrowser(const QStringList& types,DomainBrowser* domains,int flags)
{
if (domains) init(types,domains,flags);
else init(types,new DomainBrowser(this),flags|AutoDelete);
}
void ServiceBrowser::init(const QStringList& type,DomainBrowser* domains,int flags)
{
d = new ServiceBrowserPrivate();
d->resolvers.setAutoDelete(true);
d->m_types=type;
d->m_flags=flags;
d->m_domains = domains;
connect(d->m_domains,SIGNAL(domainAdded(const QString& )),this,SLOT(addDomain(const QString& )));
connect(d->m_domains,SIGNAL(domainRemoved(const QString& )),this,
SLOT(removeDomain(const QString& )));
}
ServiceBrowser::ServiceBrowser(const QString& type,const QString& domain,bool autoResolve)
{
init(type,new DomainBrowser(domain,false,this),autoResolve ? AutoResolve|AutoDelete : AutoDelete);
}
ServiceBrowser::ServiceBrowser(const QString& type,const QString& domain,int flags)
{
init(type,new DomainBrowser(domain,false,this),flags | AutoDelete);
}
const ServiceBrowser::State ServiceBrowser::isAvailable()
{
#ifdef HAVE_DNSSD
QFile f(MDNSD_PID);
if (!f.open(IO_ReadOnly)) return Stopped; // no pidfile
QString line;
if (f.readLine(line,16)<1) return Stopped;
unsigned int pid = line.toUInt();
if (pid==0) return Stopped; // not a pid
return (kill(pid,0)==0 || errno==EPERM) ? Working : Stopped;
// signal 0 only checks if process is running, mdnsd is probably owned by 'nobody' so we will
// get EPERM, if mdnsd is not running error will be ESRCH
#else
return Unsupported;
#endif
}
ServiceBrowser::~ ServiceBrowser()
{
if (d->m_flags & AutoDelete) delete d->m_domains;
delete d;
}
const DomainBrowser* ServiceBrowser::browsedDomains() const
{
return d->m_domains;
}
void ServiceBrowser::serviceResolved(bool success)
{
QObject* sender_obj = const_cast<QObject*>(sender());
RemoteService* svr = static_cast<RemoteService*>(sender_obj);
disconnect(svr,SIGNAL(resolved(bool)),this,SLOT(serviceResolved(bool)));
QValueList<RemoteService::Ptr>::Iterator it = d->m_duringResolve.begin();
QValueList<RemoteService::Ptr>::Iterator itEnd = d->m_duringResolve.end();
while ( it!= itEnd && svr!= (*it)) ++it;
if (it != itEnd) {
if (success) {
d->m_services+=(*it);
emit serviceAdded(svr);
}
d->m_duringResolve.remove(it);
queryFinished();
}
}
void ServiceBrowser::startBrowse()
{
if (d->m_running) return;
d->m_running=true;
if (isAvailable()!=Working) return;
if (d->m_domains->isRunning()) {
QStringList::const_iterator itEnd = d->m_domains->domains().end();
for ( QStringList::const_iterator it = d->m_domains->domains().begin(); it != itEnd; ++it )
addDomain(*it);
} else d->m_domains->startBrowse();
}
void ServiceBrowser::gotNewService(RemoteService::Ptr svr)
{
if (findDuplicate(svr)==(d->m_services.end())) {
if (d->m_flags & AutoResolve) {
connect(svr,SIGNAL(resolved(bool )),this,SLOT(serviceResolved(bool )));
d->m_duringResolve+=svr;
svr->resolveAsync();
} else {
d->m_services+=svr;
emit serviceAdded(svr);
}
}
}
void ServiceBrowser::gotRemoveService(RemoteService::Ptr svr)
{
QValueList<RemoteService::Ptr>::Iterator it = findDuplicate(svr);
if (it!=(d->m_services.end())) {
emit serviceRemoved(*it);
d->m_services.remove(it);
}
}
void ServiceBrowser::removeDomain(const QString& domain)
{
while (d->resolvers[domain]) d->resolvers.remove(domain);
QValueList<RemoteService::Ptr>::Iterator it = d->m_services.begin();
while (it!=d->m_services.end())
// use section to skip possible trailing dot
if ((*it)->domain().section('.',0) == domain.section('.',0)) {
emit serviceRemoved(*it);
it = d->m_services.remove(it);
} else ++it;
}
void ServiceBrowser::addDomain(const QString& domain)
{
if (!d->m_running) return;
if (!(d->resolvers[domain])) {
QStringList::ConstIterator itEnd = d->m_types.end();
for (QStringList::ConstIterator it=d->m_types.begin(); it!=itEnd; ++it) {
Query* b = new Query((*it),domain);
connect(b,SIGNAL(serviceAdded(DNSSD::RemoteService::Ptr)),this,
SLOT(gotNewService(DNSSD::RemoteService::Ptr)));
connect(b,SIGNAL(serviceRemoved(DNSSD::RemoteService::Ptr )),this,
SLOT(gotRemoveService(DNSSD::RemoteService::Ptr)));
connect(b,SIGNAL(finished()),this,SLOT(queryFinished()));
b->startQuery();
d->resolvers.insert(domain,b);
}
}
}
void ServiceBrowser::queryFinished()
{
if (allFinished()) emit finished();
}
bool ServiceBrowser::allFinished()
{
if (d->m_duringResolve.count()) return false;
bool all = true;
QDictIterator<Query> it(d->resolvers);
for ( ; it.current(); ++it) all&=(*it)->isFinished();
return all;
}
const QValueList<RemoteService::Ptr>& ServiceBrowser::services() const
{
return d->m_services;
}
void ServiceBrowser::virtual_hook(int, void*)
{}
QValueList<RemoteService::Ptr>::Iterator ServiceBrowser::findDuplicate(RemoteService::Ptr src)
{
QValueList<RemoteService::Ptr>::Iterator itEnd = d->m_services.end();
for (QValueList<RemoteService::Ptr>::Iterator it = d->m_services.begin(); it!=itEnd; ++it)
if ((src->type()==(*it)->type()) && (src->serviceName()==(*it)->serviceName()) &&
(src->domain() == (*it)->domain())) return it;
return itEnd;
}
}
#include "servicebrowser.moc"
DNSSD::Query::startQuery
virtual void startQuery()
Starts query.
Definition: query.cpp:77
DNSSD::ServiceBrowser::isAvailable
static const State isAvailable()
Checks availability of DNS-SD services (this also covers publishing).
Definition: servicebrowser.cpp:86
DNSSD::ServiceBrowser::removeDomain
void removeDomain(const QString &domain)
Remove one domain from list of domains to browse.
Definition: servicebrowser.cpp:168
DNSSD::ServiceBrowser::finished
void finished()
Emitted when all services has been reported.
DNSSD::ServiceBrowser::ServiceBrowser
ServiceBrowser(const QStringList &types, DomainBrowser *domains, int flags)
ServiceBrowser constructor.
Definition: servicebrowser.cpp:60
DNSSD::RemoteService
RemoteService class allows to resolve service announced on remote machine.
Definition: remoteservice.h:42
DNSSD::ServiceBrowser::startBrowse
virtual void startBrowse()
Starts browsing for services.
Definition: servicebrowser.cpp:132
DNSSD::ServiceBrowser::serviceAdded
void serviceAdded(DNSSD::RemoteService::Ptr)
Emitted when new service is discovered (or resolved if autoresolve is set.
DNSSD::ServiceBrowser::AllServices
static const QString AllServices
Special service type to search for all available service types.
Definition: servicebrowser.h:142
DNSSD::ServiceBrowser::browsedDomains
const DomainBrowser * browsedDomains() const
Return DomainBrowser containing domains being browsed.
Definition: servicebrowser.cpp:109
DNSSD::DomainBrowser
Class used to provide current list of domains for browsing.
Definition: domainbrowser.h:41
DNSSD::Query
This class provides way to search for specified service type in one domain.
Definition: query.h:39
DNSSD::ServiceBrowser::State
State
Availability of DNS-SD services.
Definition: servicebrowser.h:75
DNSSD::ServiceBrowser::addDomain
void addDomain(const QString &domain)
Add new domain to browse.
Definition: servicebrowser.cpp:180
DNSSD::ServiceBrowser::services
const QValueList< RemoteService::Ptr > & services() const
Returns list of services.
Definition: servicebrowser.cpp:212
DNSSD::ServiceBrowser::serviceRemoved
void serviceRemoved(DNSSD::RemoteService::Ptr)
Emitted when service is no longer announced.

KDE Home | KDE Accessibility Home | Description of Access Keys