obex.c

这是Linux环境下的openobex

/*********************************************************************
 *                
 * Filename:      obex.c
 * Version:       0.9
 * Description:   API to be used by applications wanting to use OBEX
 * Status:        Stable.
 * Author:        Dag Brattli <[e-mail]>
 * Created at:    Sat Apr 17 16:50:25 1999
 * CVS ID:        $Id: obex.c,v 1.45 2005/12/25 03:48:00 holtmann Exp $
 * 
 *     Copyright (c) 1999, 2000 Dag Brattli, All Rights Reserved.
 *     Copyright (c) 1999, 2000 Pontus Fuchs, All Rights Reserved.
 *
 *     This library is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU Lesser 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
 *     Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public
 *     License along with this library; if not, write to the Free Software
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
 *     MA  02111-1307  USA
 *     
 ********************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <errno.h>

#ifdef _WIN32
#include <winsock.h>
#define ESOCKTNOSUPPORT 1
#else /* _WIN32 */

#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#endif

#include "obex_main.h"
#include "obex_object.h"
#include "obex_connect.h"
#include "obex_client.h"

#include "inobex.h"
#ifdef HAVE_IRDA
#include "irobex.h"
#endif
#ifdef HAVE_USB
#include "usbobex.h"
#endif
#ifdef HAVE_BLUETOOTH
#include "btobex.h"
#else
// This is to workaround compilation without Bluetooth support. - Jean II
typedef char *bdaddr_t;
#endif

void OBEX_FreeInterfaces(obex_t *self);

/**
 * OBEX_Init - Initialize OBEX.
 * @transport: Which transport to use. The following transports are available :
 *             %OBEX_TRANS_IRDA : Use regular IrDA socket (need an IrDA stack)
 *             %OBEX_TRANS_INET : Use regular TCP/IP socket
 *             %OBEX_TRANS_CUSTOM : Use user provided transport
 *             %OBEX_TRANS_BLUETOOTH: Use regular Bluetooth RFCOMM socket (need the BlueZ stack)
 *             %OBEX_TRANS_USB: Use USB transport (libusb needed)
 *             If you use %OBEX_TRANS_CUSTOM you must register your own
 *             transport with OBEX_RegisterCTransport()
 * @eventcb: Function pointer to your event callback.
 *           See obex.h for prototype of this callback.
 * @flags: Bitmask of flags. The following flags are available :
 *         %OBEX_FL_KEEPSERVER : Keep the server alive after incomming request
 *         %OBEX_FL_FILTERHINT : Filter target devices based on Obex hint bit
 *         %OBEX_FL_FILTERIAS  : Filter target devices based on IAS entry
 *
 * Returns an OBEX handle or %NULL on error.
 */
obex_t *OBEX_Init(int transport, obex_event_t eventcb, unsigned int flags)
{
	obex_t *self;

#if OBEX_DEBUG
	obex_debug = OBEX_DEBUG;
#endif
#if OBEX_DUMP
	obex_dump = OBEX_DUMP;
#endif

	obex_return_val_if_fail(eventcb != NULL, NULL);

#ifdef _WIN32
	{
		WSADATA WSAData;
	  	if (WSAStartup (MAKEWORD(2,0), &WSAData) != 0) {
			DEBUG(4, "WSAStartup failed\n");
			return NULL;
		}
	}
#endif

	self = malloc(sizeof(obex_t));
	if (self == NULL)
		return NULL;
	memset(self, 0, sizeof(obex_t));

	self->eventcb = eventcb;

	self->keepserver = (flags & OBEX_FL_KEEPSERVER) ? TRUE : FALSE;
	self->filterhint = (flags & OBEX_FL_FILTERHINT) ? TRUE : FALSE;
	self->filterias  = (flags & OBEX_FL_FILTERIAS ) ? TRUE : FALSE;
	self->fd = -1;
	self->serverfd = -1;
	self->writefd = -1;
        self->state = MODE_SRV | STATE_IDLE;
	
	/* Init transport */
	self->trans.type = transport;
	self->trans.connected = FALSE;
	
	/* Safe values.
	 * Both self->mtu_rx and self->mtu_tx_max can be increased by app
	 * self->mtu_tx will be whatever the other end sneds us - Jean II */
	/* Set MTU to the maximum, if using USB transport - Alex Kanavin */
	if (transport == OBEX_TRANS_USB) {
		self->mtu_rx = OBEX_MAXIMUM_MTU;
		self->mtu_tx = OBEX_MINIMUM_MTU;
		self->mtu_tx_max = OBEX_MAXIMUM_MTU;
	} else {
		self->mtu_rx = OBEX_DEFAULT_MTU;
		self->mtu_tx = OBEX_MINIMUM_MTU;
		self->mtu_tx_max = OBEX_DEFAULT_MTU;
	}

	/* Allocate message buffers */
	/* It's safe to allocate them smaller than OBEX_MAXIMUM_MTU
	 * because netbuf will realloc data as needed. - Jean II */
	self->rx_msg = g_netbuf_new(self->mtu_rx);
	if (self->rx_msg == NULL)
		goto out_err;

	self->tx_msg = g_netbuf_new(self->mtu_tx_max);
	if (self->tx_msg == NULL)
		goto out_err;

#ifndef _WIN32
	/* Ignore SIGPIPE. Otherwise send() will raise it and the app will quit */
	signal(SIGPIPE, SIG_IGN);
#endif

	return self;

out_err:
	if (self->tx_msg != NULL)
		g_netbuf_free(self->tx_msg);
	if (self->rx_msg != NULL)
		g_netbuf_free(self->rx_msg);
	free(self);
	return NULL;
}

/**
 * OBEX_RegisterCTransport - Register a custom transport
 * @self: OBEX handle
 * @ctrans: Structure with callbacks to transport operations
 * (see obex_const.h for details)
 *
 * Call this function directly after OBEX_Init if you are using
 * a custom transport.
 */
int OBEX_RegisterCTransport(obex_t *self, obex_ctrans_t *ctrans)
{
	obex_return_val_if_fail(self != NULL, -1);
	obex_return_val_if_fail(ctrans != NULL, -1);

	memcpy(&self->ctrans, ctrans, sizeof(obex_ctrans_t));
	return 1;
}

/**
 * OBEX_Cleanup - Close down an OBEX instance
 * @self: OBEX handle
 *
 * Close down an OBEX instance.
 */
void OBEX_Cleanup(obex_t *self)
{
	obex_return_if_fail(self != NULL);
	
	obex_transport_disconnect_request(self);
	obex_transport_disconnect_server(self);

	if (self->tx_msg)
		g_netbuf_free(self->tx_msg);
	
	if (self->rx_msg)
		g_netbuf_free(self->rx_msg);

	OBEX_FreeInterfaces(self);
	free(self);
}


/**
 * OBEX_SetUserData - Set userdata of an OBEX handle
 * @self: OBEX handle
 * @data: It's all up to you!
 */
void OBEX_SetUserData(obex_t *self, void * data)
{
	obex_return_if_fail(self != NULL);
	self->userdata=data;
}

/**
 * OBEX_GetUserData - Read the userdata from an OBEX handle
 * @self: OBEX handle
 *
 * Returns userdata
 */
void * OBEX_GetUserData(obex_t *self)
{
	obex_return_val_if_fail(self != NULL, 0);
	return self->userdata;
}

/**
 * OBEX_SetUserCallBack - Change user callback on an OBEX handle
 * @self: OBEX handle
 * @eventcb: Function pointer to your new event callback.
 * @data: Pointer to the new user data to pass to the new callback (optional)
 */
void OBEX_SetUserCallBack(obex_t *self, obex_event_t eventcb, void * data)
{
	obex_return_if_fail(self != NULL);
	/* The callback can't be NULL */
	if(eventcb != NULL) {
		self->eventcb = eventcb;
		/* Optionaly change the user data */
		if(data != NULL)
			self->userdata = data;
	}
}

/**
 * OBEX_SetTransportMTU - Set MTU to be used for receive and transmit
 * @self: OBEX handle
 * @mtu_rx: maximum receive transport packet size
 * @mtu_tx_max: maximum transmit transport packet size negociated
 *
 * Changing those values can increase the performance of the underlying
 * transport, but will increase memory consumption and latency (especially
 * abort latency), and may trigger bugs in buggy transport.
 * This need to be set *before* establishing the connection.
 *
 * Returns -1 on error.
 */
int OBEX_SetTransportMTU(obex_t *self, uint16_t mtu_rx, uint16_t mtu_tx_max)
{
	obex_return_val_if_fail(self != NULL, -EFAULT);
	if (self->object)	{
		DEBUG(1, "We are busy.\n");
		return -EBUSY;
	}

	if (mtu_rx < OBEX_MINIMUM_MTU /*|| mtu_rx > OBEX_MAXIMUM_MTU*/)
		return -E2BIG;

	if (mtu_tx_max < OBEX_MINIMUM_MTU /*|| mtu_tx_max > OBEX_MAXIMUM_MTU*/)
		return -E2BIG;

	/* Change MTUs */
	self->mtu_rx = mtu_rx;
	self->mtu_tx_max = mtu_tx_max;
	/* Reallocate transport buffers */
	self->rx_msg = g_netbuf_realloc(self->rx_msg, self->mtu_rx);
	if (self->rx_msg == NULL)
		return -ENOMEM;
	self->tx_msg = g_netbuf_realloc(self->tx_msg, self->mtu_tx_max);
	if (self->tx_msg == NULL)
		return -ENOMEM;
	return 0;
}

/**
 * OBEX_ServerRegister - Start listening for incoming connections
 * @self: OBEX handle
 * @saddr: Local address to bind to
 * @addrlen: Length of address
 *
 * Bind a server socket to an Obex service. Common transport have
 * specialised version of this function.
 * Note : between 0.9.8 and 0.10.0, the prototype of this function
 * changed to make it generic. If you want your code to work across
 * new and old version of OpenObex, you may use #ifdef OBEX_MAXIMUM_MTU
 * to test the Obex version.
 *
 * Returns -1 on error.
 */
int OBEX_ServerRegister(obex_t *self, struct sockaddr *saddr, int addrlen)
{
	DEBUG(3, "\n");

	obex_return_val_if_fail(self != NULL, -1);
	obex_return_val_if_fail((addrlen == 0) || (saddr != NULL), -1);

	memcpy(&self->trans.self, saddr, addrlen);

	return obex_transport_listen(self);
}


/**
 * OBEX_ServerAccept - Accept an incoming connection
 * @server: OBEX handle
 * @eventcb: Event callback for client (use %NULL for same as server)
 * @data: Userdata for client (use %NULL for same as server)
 *
 * Create a new OBEX instance to handle the incomming connection.
 * The old OBEX instance will continue to listen for new connections.
 * The two OBEX instances become totally independant from each other.
 *
 * This function should be called after the library generates
 * an %OBEX_EV_ACCEPTHINT event to the user, but before the user
 * start to pull data out of the incomming connection.
 *
 * Using this function also requires that the OBEX handle was created
 * with the %OBEX_FL_KEEPSERVER flag set while calling OBEX_Init().
 *
 * Returns the client instance or %NULL for error.
 */
obex_t *OBEX_ServerAccept(obex_t *server, obex_event_t eventcb, void * data)
{
	obex_t *self;

	DEBUG(3, "\n");

	obex_return_val_if_fail(server != NULL, NULL);

	/* We can accept only if both the server and the connection socket
	 * are active */
	if((server->fd < 0) || (server->serverfd < 0))
		return(NULL);

	/* If we have started receiving something, it's too late... */
	if(server->object != NULL)
		return(NULL);

	/* Allocate new instance */
	self =  malloc(sizeof(obex_t));
	if (self == NULL)
		return(NULL);
	memset(self, 0, sizeof(obex_t));

	/* Set callback and callback data as needed */
	if(eventcb != NULL)
		self->eventcb = eventcb;
	else
		self->eventcb = server->eventcb;
	
	if(data != NULL)
		self->userdata = data;
	else
		self->userdata = server->userdata;

	self->keepserver = server->keepserver;

	/* Copy transport data */
	memcpy(&self->trans, &server->trans, sizeof(obex_transport_t));
	memcpy(&self->ctrans, &server->ctrans, sizeof(obex_ctrans_t));

	self->mtu_rx = server->mtu_rx;
	self->mtu_tx = server->mtu_tx;
	self->mtu_tx_max = server->mtu_tx_max;

	/* Allocate message buffers */
	self->rx_msg = g_netbuf_new(self->mtu_rx);
	if (self->rx_msg == NULL)
		goto out_err;

	/* Note : mtu_tx not yet negociated, so let's be safe here - Jean II */
	self->tx_msg = g_netbuf_new(self->mtu_tx_max);