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e1537f951f
[channels.c channels.h clientloop.c clientloop.h mux.c nchan.c ssh.c]
rewrite ssh(1) multiplexing code to a more sensible protocol.
The new multiplexing code uses channels for the listener and
accepted control sockets to make the mux master non-blocking, so
no stalls when processing messages from a slave.
avoid use of fatal() in mux master protocol parsing so an errant slave
process cannot take down a running master.
implement requesting of port-forwards over multiplexed sessions. Any
port forwards requested by the slave are added to those the master has
established.
add support for stdio forwarding ("ssh -W host:port ...") in mux slaves.
document master/slave mux protocol so that other tools can use it to
control a running ssh(1). Note: there are no guarantees that this
protocol won't be incompatibly changed (though it is versioned).
feedback Salvador Fandino, dtucker@
channel changes ok markus@
70 lines
3.0 KiB
C
70 lines
3.0 KiB
C
/* $OpenBSD: clientloop.h,v 1.23 2010/01/26 01:28:35 djm Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/*
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* Copyright (c) 2001 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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#include <termios.h>
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/* Client side main loop for the interactive session. */
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int client_loop(int, int, int);
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void client_x11_get_proto(const char *, const char *, u_int,
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char **, char **);
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void client_global_request_reply_fwd(int, u_int32_t, void *);
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void client_session2_setup(int, int, int, const char *, struct termios *,
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int, Buffer *, char **);
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int client_request_tun_fwd(int, int, int);
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/* Escape filter for protocol 2 sessions */
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void *client_new_escape_filter_ctx(int);
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void client_filter_cleanup(int, void *);
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int client_simple_escape_filter(Channel *, char *, int);
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/* Global request confirmation callbacks */
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typedef void global_confirm_cb(int, u_int32_t seq, void *);
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void client_register_global_confirm(global_confirm_cb *, void *);
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/* Multiplexing protocol version */
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#define SSHMUX_VER 4
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/* Multiplexing control protocol flags */
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#define SSHMUX_COMMAND_OPEN 1 /* Open new connection */
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#define SSHMUX_COMMAND_ALIVE_CHECK 2 /* Check master is alive */
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#define SSHMUX_COMMAND_TERMINATE 3 /* Ask master to exit */
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#define SSHMUX_COMMAND_STDIO_FWD 4 /* Open stdio fwd (ssh -W) */
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void muxserver_listen(void);
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void muxclient(const char *);
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void mux_exit_message(Channel *, int);
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