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92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/*
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* Copyright (c) 1999 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* RCSID("$OpenBSD: nchan.h,v 1.10 2001/02/28 08:54:55 markus Exp $"); */
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#ifndef NCHAN_H
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#define NCHAN_H
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/*
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* SSH Protocol 1.5 aka New Channel Protocol
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* Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
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* Written by Markus Friedl in October 1999
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*
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* Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
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* tear down of channels:
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*
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* 1.3: strict request-ack-protocol:
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* CLOSE ->
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* <- CLOSE_CONFIRM
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*
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* 1.5: uses variations of:
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* IEOF ->
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* <- OCLOSE
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* <- IEOF
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* OCLOSE ->
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* i.e. both sides have to close the channel
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*
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* See the debugging output from 'ssh -v' and 'sshd -d' of
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* ssh-1.2.27 as an example.
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*
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*/
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/* ssh-proto-1.5 overloads prot-1.3-message-types */
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#define SSH_MSG_CHANNEL_INPUT_EOF SSH_MSG_CHANNEL_CLOSE
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#define SSH_MSG_CHANNEL_OUTPUT_CLOSE SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
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/* possible input states */
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#define CHAN_INPUT_OPEN 0x01
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#define CHAN_INPUT_WAIT_DRAIN 0x02
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#define CHAN_INPUT_WAIT_OCLOSE 0x04
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#define CHAN_INPUT_CLOSED 0x08
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/* possible output states */
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#define CHAN_OUTPUT_OPEN 0x10
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#define CHAN_OUTPUT_WAIT_DRAIN 0x20
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#define CHAN_OUTPUT_WAIT_IEOF 0x40
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#define CHAN_OUTPUT_CLOSED 0x80
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#define CHAN_CLOSE_SENT 0x01
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#define CHAN_CLOSE_RCVD 0x02
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/* Channel EVENTS */
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typedef void chan_event_fn(Channel * c);
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/* for the input state */
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extern chan_event_fn *chan_rcvd_oclose;
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extern chan_event_fn *chan_read_failed;
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extern chan_event_fn *chan_ibuf_empty;
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/* for the output state */
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extern chan_event_fn *chan_rcvd_ieof;
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extern chan_event_fn *chan_write_failed;
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extern chan_event_fn *chan_obuf_empty;
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int chan_is_dead(Channel * c);
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void chan_init_iostates(Channel * c);
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void chan_init(void);
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#endif
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