publicservice.cpp

/* This file is part of the KDE project
 *
 * Copyright (C) 2004, 2005 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 "config.h"
 
#include "publicservice.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <netinet/in.h>
#include <sys/socket.h>
#include <tqapplication.h>
#include <network/tdesocketaddress.h>
#include <kurl.h>
#include <unistd.h>
#ifdef HAVE_DNSSD
#include <avahi-client/client.h>
#ifdef AVAHI_API_0_6
#include <avahi-client/publish.h>
#endif
#include <avahi-common/alternative.h>
#include <avahi-common/strlst.h>
#endif
#include "sdevent.h"
#include "responder.h"
#include "servicebrowser.h"
#include "settings.h"
 
namespace DNSSD
{
static unsigned long publicIP();
 
#ifdef HAVE_DNSSD
void publish_callback (AvahiEntryGroup*, AvahiEntryGroupState s,  void *context);
#endif
 
class PublicServicePrivate
{
public:
    PublicServicePrivate() : m_published(false), m_running(false), m_collision(false)
#ifdef HAVE_DNSSD
    , m_group(0)
#endif
    {}
    bool m_published;
    bool m_running;
    bool m_collision;
#ifdef HAVE_DNSSD
    AvahiEntryGroup* m_group;
#endif
    void commit()
    {
#ifdef HAVE_DNSSD
        if (!m_collision) avahi_entry_group_commit(m_group);
#endif
    }
 
};
 
PublicService::PublicService(const TQString& name, const TQString& type, unsigned int port,
                  const TQString& domain)
        : TQObject(), ServiceBase(name, type, TQString::null, domain, port)
{
    d = new PublicServicePrivate;
#ifdef HAVE_DNSSD
    if (Responder::self().client()) {
        d->m_group = avahi_entry_group_new(Responder::self().client(), publish_callback,this);
        connect(&Responder::self(),TQ_SIGNAL(stateChanged(AvahiClientState)),this,TQ_SLOT(clientState(AvahiClientState)));
    }
#endif
    if (domain.isNull())
        if (Configuration::publishType()==Configuration::EnumPublishType::LAN) m_domain="local.";
        else m_domain=Configuration::publishDomain();
}
 
 
PublicService::~PublicService()
{
#ifdef HAVE_DNSSD
    if (d->m_group) avahi_entry_group_free(d->m_group);
#endif
    delete d;
}
 
void PublicService::tryApply()
{
    if (fillEntryGroup()) d->commit();
    else {
    stop();
    emit published(false);
    }
}
 
void PublicService::setServiceName(const TQString& serviceName)
{
    m_serviceName = serviceName;
#ifdef HAVE_DNSSD
    if (d->m_running) {
        avahi_entry_group_reset(d->m_group);
        tryApply();
    }
#endif
}
 
void PublicService::setDomain(const TQString& domain)
{
    m_domain = domain;
#ifdef HAVE_DNSSD
    if (d->m_running) {
        avahi_entry_group_reset(d->m_group);
        tryApply();
    }
#endif
}
 
 
void PublicService::setType(const TQString& type)
{
    m_type = type;
#ifdef HAVE_DNSSD
    if (d->m_running) {
        avahi_entry_group_reset(d->m_group);
        tryApply();
    }
#endif
}
 
void PublicService::setPort(unsigned short port)
{
    m_port = port;
#ifdef HAVE_DNSSD
    if (d->m_running) {
        avahi_entry_group_reset(d->m_group);
        tryApply();
        }
#endif
}
 
void PublicService::setTextData(const TQMap<TQString,TQString>& textData)
{
    m_textData = textData;
#ifdef HAVE_DNSSD
    if (d->m_running) {
        avahi_entry_group_reset(d->m_group);
        tryApply();
    }
#endif
}
 
bool PublicService::isPublished() const
{
    return d->m_published;
}
 
bool PublicService::publish()
{
    publishAsync();
    while (d->m_running && !d->m_published) Responder::self().process();
    return d->m_published;
}
 
void PublicService::stop()
{
#ifdef HAVE_DNSSD
    if (d->m_group) avahi_entry_group_reset(d->m_group);
#endif
    d->m_published = false;
}
bool PublicService::fillEntryGroup()
{
#ifdef HAVE_DNSSD
    AvahiStringList *s=0;
    TQMap<TQString,TQString>::ConstIterator itEnd = m_textData.end();
    for (TQMap<TQString,TQString>::ConstIterator it = m_textData.begin(); it!=itEnd ; ++it)
    s = avahi_string_list_add_pair(s, it.key().utf8(),it.data().utf8());
#ifdef AVAHI_API_0_6
    bool res = (!avahi_entry_group_add_service_strlst(d->m_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, (AvahiPublishFlags)0,
    m_serviceName.isNull() ? avahi_client_get_host_name(Responder::self().client()) : m_serviceName.utf8().data(),
    m_type.ascii(),domainToDNS(m_domain),m_hostName.utf8(),m_port,s));
#else
    bool res = (!avahi_entry_group_add_service_strlst(d->m_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
    m_serviceName.isNull() ? avahi_client_get_host_name(Responder::self().client()) : m_serviceName.utf8().data(),
    m_type.ascii(),m_domain.utf8(),m_hostName.utf8(),m_port,s));
#endif
    avahi_string_list_free(s);
    return res;
#else
    return false;
#endif
}
 
void PublicService::clientState(AvahiClientState s)
{
    if (!d->m_running) return;
#ifdef HAVE_DNSSD
    switch (s) {
#ifdef AVAHI_API_0_6
    case AVAHI_CLIENT_FAILURE:
#else
    case AVAHI_CLIENT_S_INVALID:
    case AVAHI_CLIENT_DISCONNECTED:
#endif
        stop();
        emit published(false);
        break;
    case AVAHI_CLIENT_S_REGISTERING:
    case AVAHI_CLIENT_S_COLLISION:
        avahi_entry_group_reset(d->m_group);
        d->m_collision=true;
        break;
    case AVAHI_CLIENT_S_RUNNING:
        if (d->m_collision) {
        d->m_collision=false;
        tryApply();
        }
    }
#endif
}
 
void PublicService::publishAsync()
{
    if (d->m_running) stop();
 
#ifdef HAVE_DNSSD
    if (!d->m_group) {
        emit published(false);
        return;
    }
    AvahiClientState s=Responder::self().state();
#endif
    d->m_running=true;
    d->m_collision=true; // make it look like server is getting out of collision to force registering
#ifdef HAVE_DNSSD
    clientState(s);
#endif
}
 
#ifdef HAVE_DNSSD
void publish_callback (AvahiEntryGroup*, AvahiEntryGroupState s,  void *context)
{
    TQObject *obj = reinterpret_cast<TQObject*>(context);
    if (s!=AVAHI_ENTRY_GROUP_ESTABLISHED && s!=AVAHI_ENTRY_GROUP_COLLISION) return;
    PublishEvent* pev=new PublishEvent(s==AVAHI_ENTRY_GROUP_ESTABLISHED);
    TQApplication::postEvent(obj, pev);
}
#endif
 
const KURL PublicService::toInvitation(const TQString& host)
{
    KURL url;
    url.setProtocol("invitation");
    if (host.isEmpty()) { // select best address
        unsigned long s_address = publicIP();
        if (!s_address) return KURL();
        KNetwork::KIpAddress addr(s_address);
        url.setHost(addr.toString());
    } else  url.setHost(host);
    //FIXME: if there is no public interface, select any non-loopback
    url.setPort(m_port);
    url.setPath("/"+m_type+"/"+KURL::encode_string(m_serviceName));
    TQString query;
    TQMap<TQString,TQString>::ConstIterator itEnd = m_textData.end();
    for (TQMap<TQString,TQString>::ConstIterator it = m_textData.begin(); it!=itEnd ; ++it)
        url.addQueryItem(it.key(),it.data());;
    return url;
}
 
void PublicService::customEvent(TQCustomEvent* event)
{
#ifdef HAVE_DNSSD
    if (event->type()==TQEvent::User+SD_PUBLISH) {
        if (!static_cast<PublishEvent*>(event)->m_ok) {
            setServiceName(TQString::fromUtf8(avahi_alternative_service_name(m_serviceName.utf8())));
            return;
        }
        d->m_published=true;
        emit published(true);
    }
#endif
}
 
void PublicService::virtual_hook(int, void*)
{
}
 
static unsigned long publicIP()
{
    struct sockaddr_in addr;
    socklen_t len = sizeof(addr);
    int sock = socket(AF_INET,SOCK_DGRAM,0);
    if (sock == -1) return 0;
    addr.sin_family = AF_INET;
    addr.sin_port = 1;  // Not important, any port and public address will do
    addr.sin_addr.s_addr = 0x11111111;
    if ((connect(sock,(const struct sockaddr*)&addr,sizeof(addr))) == -1) { close(sock); return 0; }
    if ((getsockname(sock,(struct sockaddr*)&addr, &len)) == -1) { close(sock); return 0; }
    ::close(sock);
    return addr.sin_addr.s_addr;
}
 
 
}
 
#include "publicservice.moc"