source: dcc.h @ 4ac647d

Last change on this file since 4ac647d was 4ac647d, checked in by ulim <a.sporto+bee@…>, at 2008-08-04T14:21:49Z

moved some stuff around in preperation for MSN merge.

  • both ends (proto&dcc) need to finish a transfer now for it to be finished
  • moved throughput calc. and some messages to dcc (no need to implement in protocols)
  • Property mode set to 100644
File size: 3.6 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
49/* Time in seconds that a DCC transfer can be stalled before being aborted.
50 * By handling this here individual protocols don't have to think about this. */
51#define DCC_MAX_STALL 120
52
53typedef struct dcc_file_transfer {
54
55        struct im_connection *ic;
56
57        /*
58         * Depending in the status of the file transfer, this is either the socket that is
59         * being listened on for connections, or the socket over which the file transfer is
60         * taking place.
61         */
62        int fd;
63       
64        /*
65         * IDs returned by b_input_add for watch_ing over the above socket.
66         */
67        gint watch_in;   /* readable */
68        gint watch_out;  /* writable */
69       
70        /* the progress watcher cancels any file transfer if nothing happens within DCC_MAX_STALL */
71        gint progress_timeout;
72        size_t progress_bytes_last;
73
74        /*
75         * The total amount of bytes that have been sent to the irc client.
76         */
77        size_t bytes_sent;
78       
79        /* imc's handle */
80        file_transfer_t *ft;
81
82        /* if we're receiving, this is the sender's socket address */
83        struct sockaddr_storage saddr;
84
85        /* set to true if the protocol has finished
86         * (i.e. called imcb_file_finished)
87         */
88        int proto_finished;
89} dcc_file_transfer_t;
90
91file_transfer_t *dccs_send_start( struct im_connection *ic, char *user_nick, char *file_name, size_t file_size );
92
93void dcc_canceled( file_transfer_t *file, char *reason );
94
95gboolean dccs_send_write( file_transfer_t *file, char *data, unsigned int data_size );
96
97file_transfer_t *dcc_request( struct im_connection *ic, char *line );
98#endif
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