Mercurial > dropbear

comparison channel.h @ 4:fe6bca95afa7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Makefile.in contains updated files required
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
parents
children 425ed5c20157
comparison
equal deleted inserted replaced
-1:000000000000 4:fe6bca95afa7
1 /*
2 * Dropbear - a SSH2 server
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE. */
24
25 #ifndef _CHANNEL_H_
26 #define _CHANNEL_H_
27
28 #include "includes.h"
29 #include "buffer.h"
30
31 /* channel->type values */
32 #define CHANNEL_ID_NONE 0
33 #define CHANNEL_ID_SESSION 1
34 #define CHANNEL_ID_X11 2
35 #define CHANNEL_ID_AGENT 3
36 #define CHANNEL_ID_TCPDIRECT 4
37 #define CHANNEL_ID_TCPFORWARDED 5
38
39 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
40 #define SSH_OPEN_CONNECT_FAILED 2
41 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
42 #define SSH_OPEN_RESOURCE_SHORTAGE 4
43
44 #define MAX_CHANNELS 60 /* simple mem restriction, includes each tcp/x11
45 connection, so can't be _too_ small */
46
47 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
48
49 #define RECV_MAXWINDOW 6000 /* tweak */
50 #define RECV_MAXPACKET 1400 /* tweak */
51 #define RECV_MINWINDOW 19000 /* when we get below this, we send a windowadjust */
52
53 /* a simpler way to define that we need code for listeners */
54 #if !defined(DISABLE_X11FWD) || !defined(DISABLE_AUTHFWD) || \
55 !defined(DISABLE_REMOTETCPFWD)
56 #define USE_LISTENERS
57 #endif
58
59 struct ChanType;
60
61 struct Channel {
62
63 unsigned int index; /* the local channel index */
64 unsigned int remotechan;
65 unsigned int recvwindow, transwindow;
66 unsigned int recvmaxpacket, transmaxpacket;
67 void* typedata; /* a pointer to type specific data */
68 int infd; /* stdin for the program, we write to this */
69 int outfd; /* stdout for the program, we read from this */
70 int errfd; /* stdout for a program. This doesn't really fit here,
71 but makes the code a lot tidyer without being too bad. This
72 is -1 for channels which don't requre it. Currently only
73 a 'session' without a pty will use it */
74 buffer *writebuf; /* data for the program */
75
76 int sentclosed, recvclosed;
77
78 /* this is set when we receive/send a channel eof packet */
79 int recveof, senteof;
80
81 int initconn; /* used for TCP forwarding, whether the channel has been
82 fully initialised */
83
84 struct ChanType* type;
85
86 };
87
88 struct ChanType {
89
90 int sepfds; /* Whether this channel has seperate pipes for in/out or not */
91 char *name;
92 int (*inithandler)(struct Channel*);
93 int (*checkclose)(struct Channel*);
94 void (*reqhandler)(struct Channel*);
95 void (*closehandler)(struct Channel*);
96
97 };
98
99 void chaninitialise();
100 void chancleanup();
101 void setchannelfds(fd_set *readfd, fd_set *writefd);
102 void channelio(fd_set *readfd, fd_set *writefd);
103 struct Channel* newchannel(unsigned int remotechan, struct ChanType *type,
104 unsigned int transwindow, unsigned int transmaxpacket);
105
106 void recv_msg_channel_open();
107 void recv_msg_channel_request();
108 void send_msg_channel_failure(struct Channel *channel);
109 void send_msg_channel_success(struct Channel *channel);
110 void recv_msg_channel_data();
111 void recv_msg_channel_window_adjust();
112 void recv_msg_channel_close();
113 void recv_msg_channel_eof();
114
115 #ifdef USE_LISTENERS
116 int send_msg_channel_open_init(int fd, struct ChanType *type,
117 const char * typestring);
118 void recv_msg_channel_open_confirmation();
119 void recv_msg_channel_open_failure();
120 #endif
121
122 #endif /* _CHANNEL_H_ */