Adding upstream version 1:7.9p1.upstream/1%7.9p1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/nchan2.ms b/nchan2.ms
new file mode 100644
index 0000000..7001504
--- /dev/null
+++ b/nchan2.ms
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+.\"	$OpenBSD: nchan2.ms,v 1.4 2008/05/15 23:52:24 djm Exp $
+.\"
+.\" Copyright (c) 2000 Markus Friedl.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.TL
+OpenSSH Channel Close Protocol 2.0 Implementation
+.SH
+Channel Input State Diagram
+.PS
+reset
+l=1
+s=1.2
+ellipsewid=s*ellipsewid
+boxwid=s*boxwid
+ellipseht=s*ellipseht
+S1: ellipse "INPUT" "OPEN"
+move right 2*l from last ellipse.e
+S3: ellipse invis
+move down l from last ellipse.s
+S4: ellipse "INPUT" "CLOSED"
+move down l from 1st ellipse.s
+S2: ellipse "INPUT" "WAIT" "DRAIN"
+arrow from S1.e to S4.n
+box invis "rcvd CLOSE/" "shutdown_read" with .sw at last arrow.c
+arrow "ibuf_empty ||" "rcvd CLOSE/" "send EOF" "" from S2.e to S4.w
+arrow from S1.s to S2.n
+box invis "read_failed ||" "rcvd EOW/" "shutdown_read" with .e at last arrow.c
+ellipse wid .9*ellipsewid ht .9*ellipseht at S4
+arrow "start" "" from S1.w+(-0.5,0) to S1.w
+.PE
+.SH
+Channel Output State Diagram
+.PS
+S1: ellipse "OUTPUT" "OPEN"
+move right 2*l from last ellipse.e
+S3: ellipse invis
+move down l from last ellipse.s
+S4: ellipse "OUTPUT" "CLOSED"
+move down l from 1st ellipse.s
+S2: ellipse "OUTPUT" "WAIT" "DRAIN"
+arrow from S1.e to S4.n
+box invis "write_failed/" "shutdown_write" "send EOW" with .sw at last arrow.c
+arrow "obuf_empty ||" "write_failed/" "shutdown_write" "" from S2.e to S4.w
+arrow from S1.s to S2.n
+box invis "rcvd EOF ||" "rcvd CLOSE/" "-" with .e at last arrow.c
+ellipse wid .9*ellipsewid ht .9*ellipseht at S4
+arrow "start" "" from S1.w+(-0.5,0) to S1.w
+.PE
+.SH
+Notes
+.PP
+The input buffer is filled with data from the socket
+(the socket represents the local consumer/producer of the
+forwarded channel).
+The data is then sent over the INPUT-end (transmit-end) of the channel to the
+remote peer.
+Data sent by the peer is received on the OUTPUT-end (receive-end),
+saved in the output buffer and written to the socket.
+.PP
+If the local protocol instance has forwarded all data on the
+INPUT-end of the channel, it sends an EOF message to the peer.
+.PP
+A CLOSE message is sent to the peer if
+both the INPUT- and the OUTOUT-half of the local
+end of the channel are closed.
+.PP
+The channel can be deallocated by a protocol instance
+if a CLOSE message he been both sent and received.