357 lines
14 KiB
C
357 lines
14 KiB
C
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/*
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Copyright (c) 2012-2015 by Jakob Schröter <js@camaya.net>
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This file is part of the gloox library. http://camaya.net/gloox
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This software is distributed under a license. The full license
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agreement can be found in the file LICENSE in this distribution.
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This software may not be copied, modified, sold or distributed
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other than expressed in the named license agreement.
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This software is distributed without any warranty.
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*/
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#ifndef LINKLOCALMANAGER_H___
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#define LINKLOCALMANAGER_H___
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#include "config.h"
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#ifdef HAVE_MDNS
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#include "linklocal.h"
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#include "macros.h"
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#include "gloox.h"
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#include "util.h"
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#include "logsink.h"
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#include "connectiontcpserver.h"
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#include "mutex.h"
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#include "jid.h"
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#include <string>
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#include <dns_sd.h>
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namespace gloox
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{
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class ConnectionHandler;
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class ConnectionTCPClient;
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namespace LinkLocal
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{
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class Handler;
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/**
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* @brief This is a manager for server-less messaging (@xep{0174}).
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*
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* Enable compilation of this code with the @c \-\-enable-mdns switch to @c configure, or add
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* @c \#define @c HAVE_MDNS to your platform's @c config.h. @c dns_sd.h, @c libdns_sd.so, as well
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* as the @c mdnsd daemon from Apple's bonjour distribution are required. The @c mdnsd daemon has
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* to be running on the local host.
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*
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* ### Browsing the local network for XMPP services
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*
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* You can use the Manager to browse the local network for XMPP services.
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* First, create a new instance, register a LinkLocal::Handler, and call startBrowsing().
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* @code
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* m_mdns = new LinkLocal::Manager( ... );
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* m_mdns->registerLinkLocalHandler( yourHandler );
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* m_mdns->startBrowsing();
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* @endcode
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*
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* Then you will need to call @c recv() periodcally. The handler will then receive lists of available
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* or removed services. Check the @c flag member of the Service struct.
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*
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* @code
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* void MyClass::handleBrowseReply( const Service& service )
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* {
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* LinkLocal::ServiceList::const_iterator it = services.begin();
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* for( ; it != services.end(); ++it )
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* {
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* if( (*it).flag == LinkLocal::AddService )
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* {
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* // new service
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* }
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* else
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* {
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* // service removed
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* }
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* }
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* }
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* @endcode
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*
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* @note Note that your own service may show up in the list, too.
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*
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* ### Connecting to an XMPP service
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*
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* Using the info from the Service struct you can initiate a connection to the remote entity.
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* First, create a new instance of LinkLocal::Client and register some basic handlers like you
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* would with a normal gloox::Client:
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*
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* @code
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* LinkLocal::Client c( JID( "romeo@montague.net" ) );
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* c.logInstance().registerLogHandler( LogLevelDebug, LogAreaAll, this ); // optional
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* c.registerConnectionListener( yourConnectionListener );
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* @endcode
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*
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* Then call @link gloox::LinkLocal::Client::connect( const std::string&, const std::string&, const std::string&, int ) connect() @endlink
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* and pass the paramters from the Service struct that you received in handleBrowseReply().
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*
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* @code
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* c.connect( "juliet@laptop", "_presence._tcp", ".local", 4 ); // don't use literal values
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* @endcode
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*
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* Put your LinkLocal::Client instance in your event loop (or in a separate thread) and call
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* @link gloox::LinkLocal::Client::recv() recv() @endlink periodically.
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*
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* ### Advertising an XMPP service on the local network
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*
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* To advertise your own XMPP service you can (re-)use the same Manager instance from 'browsing the local network'
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* above.
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*
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* You can publish some basic info about your service in a DNS TXT record. The Manager offers the addTXTData() function
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* for that. See http://xmpp.org/registrar/linklocal.html for a list of official parameters.
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*
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* @code
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* m_mdns->addTXTData("nick","July");
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* m_mdns->addTXTData("1st","Juliet");
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* m_mdns->addTXTData("last","Capulet");
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* m_mdns->addTXTData("msg","Hanging out");
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* m_mdns->addTXTData("jid","julia@capulet.com");
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* m_mdns->addTXTData("status","avail");
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* @endcode
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*
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* Then, to start publishing the availability of your service as well as the TXT record with the additional info
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* you just call @c registerService().
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*
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* @code
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* m_mdns->registerService();
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* @endcode
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*
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* Other entities on the network will now be informed about the availability of your service.
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*
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* ### Listening for incoming connections
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*
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* The second argument to Manager's constructor is a ConnectionHandler-derived class that
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* will receive incoming connections.
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*
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* When registerService() gets called, the Manager will also start a local server that will
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* accept incoming connections. By default, it will listen on port 5562.
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*
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* In @link gloox::ConnectionHandler::handleIncomingConnection() handleIncomingConnection() @endlink
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* you should create a new LinkLocal::Client and register some basic handlers:
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*
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* @code
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* LinkLocal::Client c( JID( "romeo@desktop" ) );
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* c.logInstance().registerLogHandler( LogLevelDebug, LogAreaAll, this );
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* c.registerMessageHandler( this );
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* c.registerConnectionListener( this );
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* @endcode
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*
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* Finally you have to attach the incoming connection to the Client instance, and call connect().
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*
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* @code
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* connection->registerConnectionDataHandler( &c );
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* c.setConnectionImpl( connection );
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* c.connect();
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* @endcode
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*
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* Add the Client to your event loop to call recv() periodically.
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*
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* @see @c linklocal_example.cpp in @c src/examples/ for a (very) simple implementation of a bot
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* handling both incoming and outgoing connections.
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*
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* @author Jakob Schröter <js@camaya.net>
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* @since 1.0.x
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*/
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class GLOOX_API Manager
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{
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public:
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/**
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* Creates a new Link-local Manager instance. You can call @c registerService() and/or @c startBrowsing()
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* immediately on a new Manager object, it will use sane defaults.
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* @param user The username to advertise, preferably (as per @xep{0174}) the locally
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* logged-in user. This is just the local part of the local JID.
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* @param connHandler A pointer to a ConnectionHandler that will receive incoming connections.
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* @param logInstance The log target. Obtain it from ClientBase::logInstance().
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*/
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Manager( const std::string& user, ConnectionHandler* connHandler, const LogSink &logInstance );
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/**
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* Virtual destructor.
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* @note @c deregisterService() and @c stopBrowsing() will be called automatically if necessary.
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*/
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virtual ~Manager();
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/**
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* Lets you add additional data to the published TXT record.
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* @note The @c txtvers=1 parameter is included by default and cannot be changed.
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* @param key The key of a key=value parameter pair. Must be non-empty. If the given key
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* has been set before, its value will be overwritten by the new value.
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* @param value The value of a @c key=value parameter pair. Must be non-empty.
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* @note If either parameter is empty, this function is a NOOP.
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* @note The additional data will not be automatically published if you have already called
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* @c registerService(). You will have to call @c registerService() again to update the
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* TXT record.
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*/
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void addTXTData( const std::string& key, const std::string& value );
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/**
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* Lets you remove TXT record data by key.
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* @note The @c txtvers=1 parameter is included by default and cannot be removed.
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* @param key The key of the @c key=value parameter pair that should be removed. Must be non-empty.
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* @note A published TXT record will not be automatically updated if you have already called
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* @c registerService(). You will have to call @c registerService() again to update the TXT record.
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*/
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void removeTXTData( const std::string& key );
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/**
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* Starts advertising link-local messaging capabilities by publishing a number of DNS records,
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* as per @xep{0174}.
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* You can call this function again to publish any values you updated after the first call.
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*/
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void registerService();
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/**
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* Removes the published DNS records and thereby stops advertising link-local messaging
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* capabilities.
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*/
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void deregisterService();
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/**
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* Lets you specify a new username.
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* @param user The new username.
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* @note The new username will not be automatically advertised if you have already called
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* @c registerService(). You will have to call @c registerService() again to update the username.
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*/
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void setUser( const std::string& user ) { m_user = user; }
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/**
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* Lets you specify an alternate host name to advertise. By default the local machine's hostname
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* as returned by @c gethostname() will be used.
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* @param host The hostname to use.
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* @note The new hostname will not be automatically advertised if you have already called
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* @c registerService(). You will have to call @c registerService() again to update the hostname.
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*/
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void setHost( const std::string& host ) { m_host = host; }
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/**
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* This function lets you set an alternate browse domain. The default domain should work in most cases.
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* @param domain The browse domain to set.
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* @note The new domain will not be automatically used if you have already called
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* @c registerService(). You will have to call @c registerService() again to update the domain.
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* The same applies to @c startBrowsing().
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*/
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void setDomain( const std::string& domain ) { m_domain = domain; }
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/**
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* Lets you specifiy a port to listen on for incoming server-less XMPP connections. Default
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* for this implementation is port 5562, but any unused port can be used.
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* @note In addition to the SRV record, the port will also be published in the TXT record
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* automaticlly, you do not have to add it manually. That is, you should not call
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* @c addTXTData() with a key of @c "port.p2pj".
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* @param port The port to use.
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* @note The new port will not be automatically advertised if you have already called
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* @c registerService(). You will have to call @c registerService() again to update the port.
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*/
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void setPort( const int port ) { m_port = port; addTXTData( "port.p2pj", util::int2string( m_port ) ); }
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/**
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* This function can be used to set a non-default interface. Use @c if_nametoindex() to
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* find the index for a specific named device.
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* By default DNS records will be broadcast on all available interfaces, and all available
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* interfaces will be used or browsing services.
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* @param iface The interface to use. If you set an interface here, and want to change it
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* back to 'any', use @b 0. Use @b -1 to broadcast only on the local machine.
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* @note The new interface will not be automatically used if you have already called
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* @c registerService(). You will have to call @c registerService() again to use the new
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* interface. The same applies to @c startBrowsing().
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*/
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void setInterface( unsigned iface ) { m_interface = iface; }
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/**
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* Starts looking for other entities of type @c _presence. You have to set a handler for
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* results using @c registerLinkLocalHandler() before calling this function.
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* You can call this function again to re-start browsing with updated parameters.
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* @return Returns @b true if browsing could be started successfully, @b false otherwise.
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*/
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bool startBrowsing();
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/**
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* Stops the browsing.
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*/
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void stopBrowsing();
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/**
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* Exposes the socket used for browsing so you can have it checked in your own event loop,
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* if desired. If your event loop signals new data on the socket, you should NOT
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* try to read from it directly. Instead you should call @c recv().
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* As an alternative to using the raw socket you could also put the Manager in a
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* separate thread and call @c recv() repeatedly, or achieve this in any other way.
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*/
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int socket() const { return m_browseFd; }
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/**
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* Checks once for new data on the socket used for browsing.
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* @param timeout The timeout for @c select() in microseconds. Use @b -1 if blocking behavior
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* is acceptable.
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*/
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void recv( int timeout );
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/**
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* Registers a handler that will be notfied about entities found on the network that match
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* the given browse criteria.
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* @param handler The handler to register.
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*/
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void registerLinkLocalHandler( Handler* handler ) { m_linkLocalHandler = handler; }
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// /**
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// *
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// */
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// static const StringMap decodeTXT( const std::string& txt );
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private:
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static void handleBrowseReply( DNSServiceRef sdRef, DNSServiceFlags flags, unsigned interfaceIndex,
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DNSServiceErrorType errorCode, const char* serviceName, const char* regtype,
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const char* replyDomain, void* context );
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void handleBrowse( Flag flag, const std::string& service, const std::string& regtype, const std::string& domain, int iface, bool moreComing );
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typedef std::list<ConnectionTCPClient*> ConnectionList;
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typedef std::map<ConnectionTCPClient*, const JID> ConnectionMap;
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DNSServiceRef m_publishRef;
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DNSServiceRef m_browseRef;
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ServiceList m_tmpServices;
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// ServiceList m_services;
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std::string m_user;
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std::string m_host;
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std::string m_domain;
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unsigned m_interface;
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int m_port;
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const LogSink& m_logInstance;
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int m_browseFd;
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StringMap m_txtData;
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ConnectionTCPServer m_server;
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Handler* m_linkLocalHandler;
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ConnectionHandler* m_connectionHandler;
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};
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}
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}
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#endif // HAVE_MDNS
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#endif // LINKLOCALMANAGER_H___
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