xref: /openssh-portable/clientloop.h (revision cecee2d6)
1 /* $OpenBSD: clientloop.h,v 1.36 2018/07/09 21:03:30 markus Exp $ */
2 
3 /*
4  * Author: Tatu Ylonen <ylo@cs.hut.fi>
5  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6  *                    All rights reserved
7  *
8  * As far as I am concerned, the code I have written for this software
9  * can be used freely for any purpose.  Any derived versions of this
10  * software must be clearly marked as such, and if the derived work is
11  * incompatible with the protocol description in the RFC file, it must be
12  * called by a name other than "ssh" or "Secure Shell".
13  */
14 /*
15  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
16  *
17  * Redistribution and use in source and binary forms, with or without
18  * modification, are permitted provided that the following conditions
19  * are met:
20  * 1. Redistributions of source code must retain the above copyright
21  *    notice, this list of conditions and the following disclaimer.
22  * 2. Redistributions in binary form must reproduce the above copyright
23  *    notice, this list of conditions and the following disclaimer in the
24  *    documentation and/or other materials provided with the distribution.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include <termios.h>
39 
40 struct ssh;
41 
42 /* Client side main loop for the interactive session. */
43 int	 client_loop(struct ssh *, int, int, int);
44 int	 client_x11_get_proto(struct ssh *, const char *, const char *,
45 	    u_int, u_int, char **, char **);
46 void	 client_global_request_reply_fwd(int, u_int32_t, void *);
47 void	 client_session2_setup(struct ssh *, int, int, int,
48 	    const char *, struct termios *, int, struct sshbuf *, char **);
49 char	 *client_request_tun_fwd(struct ssh *, int, int, int);
50 void	 client_stop_mux(void);
51 
52 /* Escape filter for protocol 2 sessions */
53 void	*client_new_escape_filter_ctx(int);
54 void	 client_filter_cleanup(struct ssh *, int, void *);
55 int	 client_simple_escape_filter(struct ssh *, Channel *, char *, int);
56 
57 /* Global request confirmation callbacks */
58 typedef void global_confirm_cb(struct ssh *, int, u_int32_t, void *);
59 void	 client_register_global_confirm(global_confirm_cb *, void *);
60 
61 /* Channel request confirmation callbacks */
62 enum confirm_action { CONFIRM_WARN = 0, CONFIRM_CLOSE, CONFIRM_TTY };
63 void client_expect_confirm(struct ssh *, int, const char *,
64     enum confirm_action);
65 
66 /* Multiplexing protocol version */
67 #define SSHMUX_VER			4
68 
69 /* Multiplexing control protocol flags */
70 #define SSHMUX_COMMAND_OPEN		1	/* Open new connection */
71 #define SSHMUX_COMMAND_ALIVE_CHECK	2	/* Check master is alive */
72 #define SSHMUX_COMMAND_TERMINATE	3	/* Ask master to exit */
73 #define SSHMUX_COMMAND_STDIO_FWD	4	/* Open stdio fwd (ssh -W) */
74 #define SSHMUX_COMMAND_FORWARD		5	/* Forward only, no command */
75 #define SSHMUX_COMMAND_STOP		6	/* Disable mux but not conn */
76 #define SSHMUX_COMMAND_CANCEL_FWD	7	/* Cancel forwarding(s) */
77 #define SSHMUX_COMMAND_PROXY		8	/* Open new connection */
78 
79 void	muxserver_listen(struct ssh *);
80 int	muxclient(const char *);
81 void	mux_exit_message(struct ssh *, Channel *, int);
82 void	mux_tty_alloc_failed(struct ssh *ssh, Channel *);
83 
84