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/**
* @file directconn.h MSN direct connection functions
*
* purple
*
* Purple is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#ifndef MSN_DIRECTCONN_H
#define MSN_DIRECTCONN_H
typedef struct _MsnDirectConn MsnDirectConn;
#include "network.h"
#include "proxy.h"
#include "circbuffer.h"
#include "msg.h"
#include "slp.h"
#include "slplink.h"
#include "slpmsg.h"
typedef enum
{
DC_STATE_CLOSED, /*< No socket opened yet */
DC_STATE_FOO, /*< Waiting for FOO message */
DC_STATE_HANDSHAKE, /*< Waiting for handshake message */
DC_STATE_HANDSHAKE_REPLY, /*< Waiting for handshake reply message */
DC_STATE_ESTABLISHED /*< Handshake complete */
} MsnDirectConnState;
typedef enum
{
DC_PROCESS_OK = 0,
DC_PROCESS_ERROR,
DC_PROCESS_FALLBACK,
DC_PROCESS_CLOSE
} MsnDirectConnProcessResult;
typedef enum
{
DC_NONCE_UNKNOWN, /**< Invalid scheme */
DC_NONCE_PLAIN, /**< No hashing */
DC_NONCE_SHA1 /**< First 16 bytes of SHA1 of nonce */
} MsnDirectConnNonceType;
typedef struct _MsnDirectConnPacket MsnDirectConnPacket;
struct _MsnDirectConnPacket {
guint32 length;
guchar *data;
void (*sent_cb)(struct _MsnDirectConnPacket*);
MsnMessage *msg;
};
struct _MsnDirectConn
{
MsnDirectConnState state; /**< Direct connection status */
MsnSlpLink *slplink; /**< The slplink using this direct connection */
MsnSlpCall *slpcall; /**< The slpcall which initiated the direct connection */
char *msg_body; /**< The body of message sent by send_connection_info_msg_cb */
MsnSlpMessage *prev_ack; /**< The saved SLP ACK message */
MsnDirectConnNonceType nonce_type; /**< The type of nonce hashing */
guchar nonce[16]; /**< The nonce used for handshake */
gchar nonce_hash[37]; /**< The hash of nonce */
gchar remote_nonce[37]; /**< The remote side's nonce */
PurpleNetworkListenData *listen_data; /**< The pending socket creation request */
PurpleProxyConnectData *connect_data; /**< The pending connection attempt */
int listenfd; /**< The socket we're listening for incoming connections */
guint listenfd_handle; /**< The timeout handle for incoming connection */
guint connect_timeout_handle; /**< The timeout handle for outgoing connection */
int fd; /**< The direct connection socket */
guint recv_handle; /**< The incoming data callback handle */
guint send_handle; /**< The outgoing data callback handle */
gchar *in_buffer; /**< The receive buffer */
int in_size; /**< The receive buffer size */
int in_pos; /**< The first free position in receive buffer */
GQueue *out_queue; /**< The outgoing packet queue */
int msg_pos; /**< The position of next byte to be sent in the actual packet */
MsnSlpHeader header; /**< SLP header for parsing / serializing */
/** The callback used for sending information to the peer about the opened socket */
void (*send_connection_info_msg_cb)(MsnDirectConn *);
gchar *ext_ip; /**< Our external IP address */
int ext_port; /**< Our external port */
guint timeout_handle;
gboolean progress;
/*int num_calls;*/ /**< The number of slpcalls using this direct connection */
};
/* Outgoing attempt */
#define DC_OUTGOING_TIMEOUT (5)
/* Time for internal + external connection attempts */
#define DC_INCOMING_TIMEOUT (DC_OUTGOING_TIMEOUT * 3)
/* Timeout for lack of activity */
#define DC_TIMEOUT (60)
/*
* Queues an MSN message to be sent via direct connection.
*/
void
msn_dc_enqueue_msg(MsnDirectConn *dc, MsnMessage *msg);
/*
* Creates, initializes, and returns a new MsnDirectConn structure.
*/
MsnDirectConn *
msn_dc_new(MsnSlpCall *slpcall);
/*
* Destroys an MsnDirectConn structure. Frees every buffer allocated earlier
* restores saved callbacks, etc.
*/
void
msn_dc_destroy(MsnDirectConn *dc);
/*
* Fallback to switchboard connection. Used when neither side is able to
* create a listening socket.
*/
void
msn_dc_fallback_to_sb(MsnDirectConn *dc);
/*
* Increases the slpcall counter in DC. The direct connection remains open
* until all slpcalls using it are destroyed.
*/
void
msn_dc_ref(MsnDirectConn *dc);
/*
* Decrease the slpcall counter in DC. The direct connection remains open
* until all slpcalls using it are destroyed.
*/
void
msn_dc_unref(MsnDirectConn *dc);
/*
* Sends a direct connect INVITE message on the associated slplink
* with the corresponding connection type and information.
*/
void
msn_dc_send_invite(MsnDirectConn *dc);
/*
* Sends a direct connect OK message as a response to an INVITE received earliaer
* on the corresponding slplink.
*/
void
msn_dc_send_ok(MsnDirectConn *dc);
/*
* This callback will be called when we're successfully connected to
* the remote host.
*/
void
msn_dc_connected_to_peer_cb(gpointer data, gint fd, const gchar *error_msg);
/*
* This callback will be called when we're unable to connect to
* the remote host in DC_CONNECT_TIMEOUT seconds.
*/
gboolean
msn_dc_outgoing_connection_timeout_cb(gpointer data);
/*
* This callback will be called when the listening socket is successfully
* created and its parameters (IP/port) are available.
*/
void
msn_dc_listen_socket_created_cb(int listenfd, gpointer data);
#endif /* MSN_DIRECTCONN_H */
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