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Annotation of src/usr.bin/ssh/nchan.h, Revision 1.5

1.5     ! markus      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.
        !            12:  * 3. All advertising materials mentioning features or use of this software
        !            13:  *    must display the following acknowledgement:
        !            14:  *      This product includes software developed by Markus Friedl.
        !            15:  * 4. The name of the author may not be used to endorse or promote products
        !            16:  *    derived from this software without specific prior written permission.
        !            17:  *
        !            18:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            20:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            21:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            22:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            23:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            24:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            25:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            26:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            27:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            28:  */
        !            29:
1.4       deraadt    30: /* RCSID("$Id: nchan.h,v 1.3 1999/10/17 16:56:09 markus Exp $"); */
1.2       markus     31:
1.1       markus     32: #ifndef NCHAN_H
                     33: #define NCHAN_H
                     34:
                     35: /*
1.2       markus     36:  * SSH Protocol 1.5 aka New Channel Protocol
                     37:  * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
                     38:  * Written by Markus Friedl in October 1999
1.4       deraadt    39:  *
1.2       markus     40:  * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
                     41:  * tear down of channels:
1.4       deraadt    42:  *
1.2       markus     43:  * 1.3:        strict request-ack-protocol:
                     44:  *     CLOSE   ->
                     45:  *             <-  CLOSE_CONFIRM
1.4       deraadt    46:  *
1.2       markus     47:  * 1.5:        uses variations of:
                     48:  *     IEOF    ->
                     49:  *             <-  OCLOSE
                     50:  *             <-  IEOF
                     51:  *     OCLOSE  ->
                     52:  *     i.e. both sides have to close the channel
1.4       deraadt    53:  *
1.2       markus     54:  * See the debugging output from 'ssh -v' and 'sshd -d' of
                     55:  * ssh-1.2.27 as an example.
1.4       deraadt    56:  *
1.2       markus     57:  */
1.1       markus     58:
1.3       markus     59: /* ssh-proto-1.5 overloads prot-1.3-message-types */
                     60: #define SSH_MSG_CHANNEL_INPUT_EOF      SSH_MSG_CHANNEL_CLOSE
                     61: #define SSH_MSG_CHANNEL_OUTPUT_CLOSE   SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
                     62:
                     63: /* possible input states */
                     64: #define CHAN_INPUT_OPEN                        0x01
                     65: #define CHAN_INPUT_WAIT_DRAIN          0x02
                     66: #define CHAN_INPUT_WAIT_OCLOSE         0x04
                     67: #define CHAN_INPUT_CLOSED              0x08
                     68:
                     69: /* possible output states */
                     70: #define CHAN_OUTPUT_OPEN               0x10
                     71: #define CHAN_OUTPUT_WAIT_DRAIN         0x20
                     72: #define CHAN_OUTPUT_WAIT_IEOF          0x40
                     73: #define CHAN_OUTPUT_CLOSED             0x80
1.1       markus     74:
1.3       markus     75: /* EVENTS for the input state */
1.4       deraadt    76: void    chan_rcvd_oclose(Channel * c);
                     77: void    chan_read_failed(Channel * c);
                     78: void    chan_ibuf_empty(Channel * c);
1.3       markus     79:
                     80: /* EVENTS for the output state */
1.4       deraadt    81: void    chan_rcvd_ieof(Channel * c);
                     82: void    chan_write_failed(Channel * c);
                     83: void    chan_obuf_empty(Channel * c);
1.3       markus     84:
1.4       deraadt    85: void    chan_init_iostates(Channel * c);
1.1       markus     86: #endif