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diff --git a/other/ssharp/nchan.h b/other/ssharp/nchan.h
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+/*
+ * Copyright (c) 1999 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.
+ */
+
+/* RCSID("$OpenBSD: nchan.h,v 1.10 2001/02/28 08:54:55 markus Exp $"); */
+
+#ifndef NCHAN_H
+#define NCHAN_H
+
+/*
+ * SSH Protocol 1.5 aka New Channel Protocol
+ * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
+ * Written by Markus Friedl in October 1999
+ *
+ * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
+ * tear down of channels:
+ *
+ * 1.3: strict request-ack-protocol:
+ *      CLOSE   ->
+ *              <-  CLOSE_CONFIRM
+ *
+ * 1.5: uses variations of:
+ *      IEOF    ->
+ *              <-  OCLOSE
+ *              <-  IEOF
+ *      OCLOSE  ->
+ *      i.e. both sides have to close the channel
+ *
+ * See the debugging output from 'ssh -v' and 'sshd -d' of
+ * ssh-1.2.27 as an example.
+ *
+ */
+
+/* ssh-proto-1.5 overloads prot-1.3-message-types */
+#define SSH_MSG_CHANNEL_INPUT_EOF       SSH_MSG_CHANNEL_CLOSE
+#define SSH_MSG_CHANNEL_OUTPUT_CLOSE    SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
+
+/* possible input states */
+#define CHAN_INPUT_OPEN                 0x01
+#define CHAN_INPUT_WAIT_DRAIN           0x02
+#define CHAN_INPUT_WAIT_OCLOSE          0x04
+#define CHAN_INPUT_CLOSED               0x08
+
+/* possible output states */
+#define CHAN_OUTPUT_OPEN                0x10
+#define CHAN_OUTPUT_WAIT_DRAIN          0x20
+#define CHAN_OUTPUT_WAIT_IEOF           0x40
+#define CHAN_OUTPUT_CLOSED              0x80
+
+#define CHAN_CLOSE_SENT                 0x01
+#define CHAN_CLOSE_RCVD                 0x02
+
+
+/* Channel EVENTS */
+typedef void    chan_event_fn(Channel * c);
+
+/* for the input state */
+extern chan_event_fn    *chan_rcvd_oclose;
+extern chan_event_fn    *chan_read_failed;
+extern chan_event_fn    *chan_ibuf_empty;
+
+/* for the output state */
+extern chan_event_fn    *chan_rcvd_ieof;
+extern chan_event_fn    *chan_write_failed;
+extern chan_event_fn    *chan_obuf_empty;
+
+int chan_is_dead(Channel * c);
+
+void    chan_init_iostates(Channel * c);
+void    chan_init(void);
+#endif