SIProfileFT Class Reference

An implementation of the file transfer SI profile (XEP-0096). More...

#include <siprofileft.h>

Inherits SIProfileHandler, SIHandler, BytestreamHandler, and IqHandler.

Inheritance diagram for SIProfileFT:

[legend]List of all members.


Public Types
enum	StreamType { FTTypeS5B = 1, FTTypeIBB = 2, FTTypeOOB = 4, FTTypeAll = 0xFF }
Public Member Functions
	SIProfileFT (ClientBase parent, SIProfileFTHandler sipfth, SIManager manager=0, SOCKS5BytestreamManager s5Manager=0)
virtual	~SIProfileFT ()
const std::string	requestFT (const JID &to, const std::string &name, long size, const std::string &hash=EmptyString, const std::string &desc=EmptyString, const std::string &date=EmptyString, const std::string &mimetype=EmptyString, int streamTypes=FTTypeAll)
void	acceptFT (const JID &to, const std::string &sid, StreamType type=FTTypeS5B)
void	declineFT (const JID &to, const std::string &sid, SIManager::SIError reason, const std::string &text=EmptyString)
void	setRangedTransfers (bool ranged)
void	dispose (Bytestream *bs)
void	registerSIProfileFTHandler (SIProfileFTHandler *sipfth)
void	removeSIProfileFTHandler ()
void	setStreamHosts (StreamHostList hosts)
void	addStreamHost (const JID &jid, const std::string &host, int port)
void	registerSOCKS5BytestreamServer (SOCKS5BytestreamServer *server)
void	removeSOCKS5BytestreamServer ()
virtual void	handleSIRequest (const JID &from, const std::string &id, const std::string &profile, const Tag si, const Tag ptag, const Tag *fneg)
virtual void	handleSIRequestResult (const JID &from, const std::string &sid, const Tag si, const Tag ptag, const Tag *fneg)
virtual void	handleSIRequestError (const IQ &iq, const std::string &sid)
virtual void	handleIncomingBytestreamRequest (const std::string &sid, const JID &from)
virtual void	handleIncomingBytestream (Bytestream *bs)
virtual void	handleOutgoingBytestream (Bytestream *bs)
virtual void	handleBytestreamError (const IQ &iq, const std::string &sid)
virtual bool	handleIq (const IQ &iq)
virtual void	handleIqID (const IQ &iq, int context)

Detailed Description

An implementation of the file transfer SI profile (XEP-0096).

An SIProfileFT object acts as a 'plugin' to the SIManager. SIProfileFT manages most of the file transfer functionality. The naming comes from the fact that File Transfer (FT) is a profile of Stream Initiation (SI).

Usage:

Create a new SIProfileFT object. It needs a ClientBase -derived object (e.g. Client) as well as a SIProfileFTHandler -derived object that will receive file transfer-related events. If you already use SI and the SIManager somewhere else, you should pass a pointer to that SIManager object as third parameter to SIProfileFT's constructor.

 class MyFileTransferHandler : public SIProfileFTHandler
 {
   // ...
 };

 Client* client = new Client( ... );
 // ...
 MyFileTransferHandler* mh = new MyFileTransferHandler( ... );

 SIProfileFT* ft = new SIProfileFT( client, mh );

You are now, basically, ready to send and receive files.

A couple of notes:

There are two (actually two and a half) possible "techniques" to transfer files using SI. The first is using a peer-to-peer SOCKS5 bytestream, optionally via a (special) SOCKS5 proxy. The second techniques is using an in-band bytestream, i.e. the data is encapsulated in XMPP stanzas and sent through the server.

To be able to send files using the former method (SOCKS5 bytestreams), you may need access to a SOCKS5 bytestream proxy (called StreamHost). This is especially true if either or both of sender and receiver are behind NATs or are otherwise blocked from establishing direct TCP connections. You should use Disco to query a potential SOCKS5 proxy for its host and port parameters and feed that information into SIProfileFT:
```
 ft->addStreamHost( JID( "proxy.server.dom" ), "101.102.103.104", 6677 );
```
You should not hard-code this information (esp. host/IP and port) into your app since the proxy may go down occasionally or vanish completely.

In addition to (or even instead of) using external SOCKS5 proxies, you can use a SOCKS5BytestreamServer object that gloox provides:
```
 SOCKS5BytestreamServer* server = new SOCKS5BytestreamServer( client->logInstance(), 1234 );
 if( server->listen() != ConnNoError )
   printf( "port in use\n" );

 ft->addStreamHost( client->jid(), my_ip, 1234 );
 ft->registerSOCKS5BytestreamServer( server );
```
This listening server should then be integrated into your mainloop to have its recv() method called from time to time. It is safe to put the server into its own thread.

When you finally receive a Bytestream via the SIProfileFTHandler, you will need to integrate this bytestream with your mainloop, or put it into a separate thread (if occasional blocking is not acceptable). You will need to call connect() on that Bytestream. For SOCKS5 bytestreams, this function will try to connect to each of the given StreamHosts and block until it has established a connection with one of them (or until all attempts failed). Further, if you want to receive a file via the bytestream, you will have to call recv() on the object from time to time. For in-band bytestreams, connect() will send an "open the bytestream" request to the contact.

For both stream types, BytestreamDataHandler::handleBytestreamOpen() will announce the established bytestream. The stream then is ready to send and receive data.

In general, both types of streams can be handled equally, i.e. there's no need to know whether the underlying stream really is a SOCKS5Bytestream or an InBandBytestream. Bytestream::type() tells anyway. Note, however, that sending large amounts of data using in-band bytestreams may trigger rate limiting in some servers.

If you e.g. told Client to connect through a HTTP proxy or a SOCKS5 proxy , or any other ConnectionBase -derived method, or even chains thereof, SIProfileFT will use the same connection types with the same configuration to connect to the Stream Host/SOCKS5 proxy. If this is inappropriate because you have e.g. a local SOCKS5 proxy inside your local network, use SOCKS5Bytestream::setConnectionImpl() to override the above default connection(s).

Do not delete Bytestream objects manually. Use dispose() instead.

When using the Client's JID as the first argument to addStreamHost() as in the code snippet above, make sure the JID is actually a full JID. If you let the server pick a resource, the call to Client::jid() needs to be made after the connection has been established and authenticated, because only then Client knows its full JID. This is generally a good idea, since the server may choose to change the resource, even if you provided one at login.

The interal SOCKS5BytestreamServer will obviously not work across NATs.

Using addStreamHost(), you can add as many potential StreamHosts as you like. However, you should add the best options (e.g. the local SOCKS5BytestreamServer) first.

When cleaning up, delete the objectes you created above in the opposite order of creation:

 delete server
 delete ft;
 delete client;

For usage examples see src/examples/ft_send.cpp and src/examples/ft_recv.cpp.

Author:: Jakob Schroeter <js@camaya.net>

Since:: 0.9

Definition at line 150 of file siprofileft.h.

Member Enumeration Documentation

enum StreamType

Supported stream types.
Enumeration values:

FTTypeS5B SOCKS5 Bytestreams.

FTTypeIBB In-Band Bytestreams.

FTTypeOOB Out-of-Band Data.

FTTypeAll All types.

Definition at line 157 of file siprofileft.h.

Constructor & Destructor Documentation

SIProfileFT ( ClientBase * parent,

SIProfileFTHandler * sipfth,

SIManager * manager = 0,

SOCKS5BytestreamManager * s5Manager = 0

)

Constructor.
Parameters:

parent The ClientBase to use for signaling.

sipfth The SIProfileFTHandler to receive events.

manager An optional SIManager to register with. If this is zero, SIProfileFT will create its own SIManager. You should pass a valid SIManager here if you are already using one with the parent ClientBase above.

s5Manager An optional SOCKS5BytestreamManager to use. If this is zero, SIProfileFT will create its own SOCKS5BytestreamManager. You should pass a valid SOCKS5BytestreamManager here if you are already using one with the parent ClientBase above.

Note:
If you passed a SIManager and/or SOCKS5BytestreamManager and/or InBandBytestreamManager to SIProfileFT's constructor, these objects will not be deleted on desctruction of SIProfileFT.

Definition at line 31 of file siprofileft.cpp.

~SIProfileFT ( ) [virtual]

Virtual destructor.
Definition at line 52 of file siprofileft.cpp.

Member Function Documentation

void acceptFT ( const JID & to,

const std::string & sid,

StreamType type = FTTypeS5B

)

Call this function to accept a file transfer request previously announced by means of SIProfileFTHandler::handleFTRequest() .
Parameters:

to The requestor.

sid The request's sid, as passed to SIProfileHandler::handleFTRequest().

type The desired stream type to use for this file transfer. Defaults to SOCKS5 Bytestream. You should not use FTTypeAll here.

Definition at line 99 of file siprofileft.cpp.

void addStreamHost ( const JID & jid,

const std::string & host,

int port

)

Adds one StreamHost to the list of SOCKS5 StreamHosts.
Parameters:

jid The StreamHost's JID.

host The StreamHost's hostname.

port The StreamHost's port.

Definition at line 163 of file siprofileft.cpp.

void declineFT ( const JID & to,

const std::string & sid,

SIManager::SIError reason,

const std::string & text = EmptyString

)

Call this function to decline a FT request previously announced by means of SIProfileFTHandler::handleFTRequest() .
Parameters:

to The requestor.

sid The request's sid, as passed to SIProfileFTHandler::handleFTRequest().

reason The reason for the reject.

text An optional human-readable text explaining the decline.

Definition at line 137 of file siprofileft.cpp.

void dispose ( Bytestream * bs )

To get rid of a bytestream (i.e., close and delete it), call this function. The remote entity will be notified about the closing of the stream.
Parameters:

bs The bytestream to dispose. It will be deleted here.

Definition at line 146 of file siprofileft.cpp.

void handleBytestreamError ( const IQ & iq,

const std::string & sid

) [virtual]

Notifies the handler of errors occuring when a bytestream was requested. For example, if the remote entity does not implement SOCKS5 bytestreams.
Parameters:

iq The error stanza.

sid The request's SID.

Implements BytestreamHandler.
Definition at line 297 of file siprofileft.cpp.

void handleIncomingBytestream ( Bytestream * bs ) [virtual]

Notifies the implementor of a new incoming bytestream. The bytestream is not yet ready to send data. To initialize the bytestream and to prepare it for data transfer, register a BytestreamDataHandler with it and call its connect() method. To not block your application while the data transfer lasts, you most likely want to put the bytestream into its own thread or process (before calling connect() on it). It is safe to do so without additional synchronization. When you are finished using the bytestream, use SIProfileFT::dispose() to get rid of it.
Parameters:

bs The bytestream.

Implements BytestreamHandler.
Definition at line 285 of file siprofileft.cpp.

void handleIncomingBytestreamRequest ( const std::string & sid,

const JID & from

) [virtual]

Notifies the implementor of a new incoming bytestream request. You have to call either BytestreamManager::acceptBytestream() or BytestreamManager::rejectBytestream(), to accept or reject the bytestream request, respectively.
Parameters:

sid The bytestream's id, to be passed to BytestreamManager::acceptBytestream() and BytestreamManager::rejectBytestream(), respectively.

from The remote initiator of the bytestream request.

Implements BytestreamHandler.
Definition at line 279 of file siprofileft.cpp.

virtual bool handleIq ( const IQ & iq ) [inline, virtual]

Reimplement this function if you want to be notified about incoming IQs.
Parameters:

iq The complete IQ stanza.

Returns:
Indicates whether a request of type 'get' or 'set' has been handled. This includes the obligatory 'result' answer. If you return false, a 'error' will be sent.

Since:
1.0

Implements IqHandler.
Definition at line 310 of file siprofileft.h.

void handleIqID ( const IQ & iq,

int context

) [virtual]

Reimplement this function if you want to be notified about incoming IQs with a specific value of the id attribute. You have to enable tracking of those IDs using Client::trackID(). This is usually useful for IDs that generate a positive reply, i.e. <iq type='result' id='reg'/> where a namespace filter wouldn't work.
Parameters:

iq The complete IQ stanza.

context A value to restore context, stored with ClientBase::trackID().

Note:
Only IQ stanzas of type 'result' or 'error' can arrive here.

Since:
1.0

Implements IqHandler.
Definition at line 262 of file siprofileft.cpp.

void handleOutgoingBytestream ( Bytestream * bs ) [virtual]

Notifies the implementor of successful establishing of an outgoing bytestream request. The stream has been accepted by the remote entity and is ready to send data. The BytestreamHandler does not become the owner of the Bytestream object. Use SIProfileFT::dispose() to get rid of the bytestream object after it has been closed.
Parameters:

bs The new bytestream.

Implements BytestreamHandler.
Definition at line 291 of file siprofileft.cpp.

void handleSIRequest ( const JID & from,

const std::string & id,

const std::string & profile,

const Tag * si,

const Tag * ptag,

const Tag * fneg

) [virtual]

This function is called to handle incoming SI requests, i.e. a remote entity requested a stream to send a file to you. You should use either SIManager::acceptSI() or SIManager::declineSI() to accept or reject the request, respectively.
Parameters:

from The SI requestor.

id The request's id (not the stream's id). This id MUST be supplied to either SIManager::acceptSI() or SIManager::declineSI().

profile The requested stream profile.

si The request's complete <si/> Tag.

ptag The profile-specific child of the SI request. May be 0, but should not be.

fneg The <feature/> child of the SI request. May be 0.

Implements SIProfileHandler.
Definition at line 169 of file siprofileft.cpp.

void handleSIRequestError ( const IQ & iq,

const std::string & sid

) [virtual]

This function is called to handle a request error or decline.
Parameters:

stanza The complete error stanza.

sid The request's SID.

Implements SIHandler.
Definition at line 273 of file siprofileft.cpp.

void handleSIRequestResult ( const JID & from,

const std::string & sid,

const Tag * si,

const Tag * ptag,

const Tag * fneg

) [virtual]

This function is called to handle results of outgoing SI requests, i.e. you requested a stream (using SIManager::requestSI()) to send a file to a remote entity.
Parameters:

from The SI receiver.

sid The stream ID.

si The request's complete <si/> Tag.

ptag The profile-specific child of the SI request. May be 0.

fneg The <feature/> child of the SI request. May be 0 (but should not be).

Implements SIHandler.
Definition at line 222 of file siprofileft.cpp.

void registerSIProfileFTHandler ( SIProfileFTHandler * sipfth ) [inline]

Registers a handler that will be informed about incoming file transfer requests, i.e. when a remote entity wishes to send a file.
Parameters:

sipfth A SIProfileFTHandler to register. Only one handler can be registered at any one time.

Definition at line 248 of file siprofileft.h.

void registerSOCKS5BytestreamServer ( SOCKS5BytestreamServer * server ) [inline]

Tells the interal SOCKS5BytestreamManager which SOCKS5BytestreamServer handles peer-2-peer SOCKS5 bytestreams.
Parameters:

server The SOCKS5BytestreamServer to use.

Definition at line 275 of file siprofileft.h.

void removeSIProfileFTHandler ( ) [inline]

Removes the previously registered file transfer request handler.
Definition at line 253 of file siprofileft.h.

void removeSOCKS5BytestreamServer ( ) [inline]

Un-registers any local SOCKS5BytestreamServer.
Definition at line 281 of file siprofileft.h.

const std::string requestFT ( const JID & to,

const std::string & name,

long size,

const std::string & hash = EmptyString,

const std::string & desc = EmptyString,

const std::string & date = EmptyString,

const std::string & mimetype = EmptyString,

int streamTypes = FTTypeAll

)

Starts negotiating a file transfer with a remote entity.
Parameters:

to The entity to send the file to. Must be a full JID.

name The file's name. Mandatory and must not be empty.

size The file's size. Mandatory and must be > 0.

hash The file content's MD5 hash.

desc A description.

date The file's last modification date/time. See XEP-0082 for details.

mimetype The file's mime-type. Defaults to 'binary/octet-stream' if empty.

streamTypes ORed StreamType that can be used for this transfer.

Returns:
The requested stream's ID (SID). Empty if conditions above (file name, size) are not met.

Definition at line 63 of file siprofileft.cpp.

void setRangedTransfers ( bool ranged ) [inline]

Enables or disables offering of ranged file transfers. This is off by default.
Parameters:

ranged True if you want to support ranged transfers, false otherwise.

Definition at line 233 of file siprofileft.h.

void setStreamHosts ( StreamHostList hosts )

Sets a list of StreamHosts that will be used for subsequent SOCKS5 bytestream requests.
Note:
At least one StreamHost is required.

Parameters:

hosts A list of StreamHosts.

Definition at line 157 of file siprofileft.cpp.

The documentation for this class was generated from the following files:

Generated on Fri Oct 3 02:15:21 2008 for gloox by

1.4.1

SIProfileFT Class Reference

Public Types

Public Member Functions

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation