source: dcc.h @ 1ba7e8f

Last change on this file since 1ba7e8f was dce3903, checked in by ulim <a.sporto+bee@…>, at 2007-12-04T00:48:57Z

Send and receive seems to work now! Also adopted the new buffering strategy,
only one buffer of 2k per transfer now.

  • Property mode set to 100644
File size: 3.2 KB
Line 
1/********************************************************************\
2* BitlBee -- An IRC to other IM-networks gateway                     *
3*                                                                    *
4* Copyright 2006 Marijn Kruisselbrink and others                     *
5* Copyright 2007 Uli Meis <a.sporto+bee@gmail.com>                   *
6\********************************************************************/
7
8/*
9  This program is free software; you can redistribute it and/or modify
10  it under the terms of the GNU General Public License as published by
11  the Free Software Foundation; either version 2 of the License, or
12  (at your option) any later version.
13
14  This program is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  GNU General Public License for more details.
18
19  You should have received a copy of the GNU General Public License with
20  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
21  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
22  Suite 330, Boston, MA  02111-1307  USA
23*/
24
25/*
26 * DCC SEND
27 *
28 * Historically, DCC means send 1024 Bytes and wait for a 4 byte reply
29 * acknowledging all transferred data. This is ridiculous for two reasons.  The
30 * first being that TCP is a stream oriented protocol that doesn't care much
31 * about your idea of a packet. The second reason being that TCP is a reliable
32 * transfer protocol with its own sophisticated ACK mechanism, making DCCs ACK
33 * mechanism look like a joke. For these reasons, DCCs requirements have
34 * (hopefully) been relaxed in most implementations and this implementation
35 * depends upon at least the following: The 1024 bytes need not be transferred
36 * at once, i.e. packets can be smaller. A second relaxation has apparently
37 * gotten the name "DCC SEND ahead" which basically means to not give a damn
38 * about those DCC ACKs and just send data as you please. This behaviour is
39 * enabled by default. Note that this also means that packets may be as large
40 * as the maximum segment size.
41 */ 
42
43#ifndef _DCC_H
44#define _DCC_H
45
46/* Send an ACK after receiving this amount of data */
47#define DCC_PACKET_SIZE 1024
48
49typedef struct dcc_file_transfer {
50
51        struct im_connection *ic;
52
53        /*
54         * Depending in the status of the file transfer, this is either the socket that is
55         * being listened on for connections, or the socket over which the file transfer is
56         * taking place.
57         */
58        int fd;
59       
60        /*
61         * IDs returned by b_input_add for watch_ing over the above socket.
62         */
63        gint watch_in;   /* readable */
64        gint watch_out;  /* writable */
65       
66        /*
67         * The total amount of bytes that have been sent to the irc client.
68         */
69        size_t bytes_sent;
70       
71        /* imc's handle */
72        file_transfer_t *ft;
73
74        /* if we're receiving, this is the sender's socket address */
75        struct sockaddr_storage saddr;
76
77} dcc_file_transfer_t;
78
79file_transfer_t *dccs_send_start( struct im_connection *ic, char *user_nick, char *file_name, size_t file_size );
80
81void dcc_canceled( file_transfer_t *file, char *reason );
82
83gboolean dccs_send_write( file_transfer_t *file, char *data, unsigned int data_size );
84
85file_transfer_t *dcc_request( struct im_connection *ic, char *line );
86#endif
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