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aa3378df | 1 | /* |
2 | * Copyright (c) 1999 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
aa3378df | 12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
bcbf86ec | 25 | /* RCSID("$OpenBSD: nchan.h,v 1.9 2000/09/07 20:27:52 deraadt Exp $"); */ |
8efc0c15 | 26 | |
27 | #ifndef NCHAN_H | |
28 | #define NCHAN_H | |
29 | ||
30 | /* | |
31 | * SSH Protocol 1.5 aka New Channel Protocol | |
32 | * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored. | |
33 | * Written by Markus Friedl in October 1999 | |
5260325f | 34 | * |
8efc0c15 | 35 | * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the |
36 | * tear down of channels: | |
5260325f | 37 | * |
8efc0c15 | 38 | * 1.3: strict request-ack-protocol: |
39 | * CLOSE -> | |
40 | * <- CLOSE_CONFIRM | |
5260325f | 41 | * |
8efc0c15 | 42 | * 1.5: uses variations of: |
43 | * IEOF -> | |
44 | * <- OCLOSE | |
45 | * <- IEOF | |
46 | * OCLOSE -> | |
47 | * i.e. both sides have to close the channel | |
5260325f | 48 | * |
8efc0c15 | 49 | * See the debugging output from 'ssh -v' and 'sshd -d' of |
50 | * ssh-1.2.27 as an example. | |
5260325f | 51 | * |
8efc0c15 | 52 | */ |
53 | ||
54 | /* ssh-proto-1.5 overloads prot-1.3-message-types */ | |
55 | #define SSH_MSG_CHANNEL_INPUT_EOF SSH_MSG_CHANNEL_CLOSE | |
56 | #define SSH_MSG_CHANNEL_OUTPUT_CLOSE SSH_MSG_CHANNEL_CLOSE_CONFIRMATION | |
57 | ||
58 | /* possible input states */ | |
59 | #define CHAN_INPUT_OPEN 0x01 | |
60 | #define CHAN_INPUT_WAIT_DRAIN 0x02 | |
61 | #define CHAN_INPUT_WAIT_OCLOSE 0x04 | |
62 | #define CHAN_INPUT_CLOSED 0x08 | |
63 | ||
64 | /* possible output states */ | |
65 | #define CHAN_OUTPUT_OPEN 0x10 | |
66 | #define CHAN_OUTPUT_WAIT_DRAIN 0x20 | |
67 | #define CHAN_OUTPUT_WAIT_IEOF 0x40 | |
68 | #define CHAN_OUTPUT_CLOSED 0x80 | |
69 | ||
7e7327a1 | 70 | #define CHAN_CLOSE_SENT 0x01 |
71 | #define CHAN_CLOSE_RCVD 0x02 | |
8efc0c15 | 72 | |
8efc0c15 | 73 | |
7e7327a1 | 74 | /* Channel EVENTS */ |
75 | typedef void chan_event_fn(Channel * c); | |
76 | ||
77 | /* for the input state */ | |
78 | extern chan_event_fn *chan_rcvd_oclose; | |
79 | extern chan_event_fn *chan_read_failed; | |
80 | extern chan_event_fn *chan_ibuf_empty; | |
81 | ||
82 | /* for the output state */ | |
83 | extern chan_event_fn *chan_rcvd_ieof; | |
84 | extern chan_event_fn *chan_write_failed; | |
85 | extern chan_event_fn *chan_obuf_empty; | |
7368a6c8 | 86 | |
7e7327a1 | 87 | extern chan_event_fn *chan_delete_if_full_closed; |
88 | ||
89 | void chan_init_iostates(Channel * c); | |
90 | void chan_init(void); | |
8efc0c15 | 91 | #endif |