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1/* $OpenBSD: clientloop.h,v 1.40 2025/12/22 01:17:31 djm 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
40struct ssh;
41
42/* Client side main loop for the interactive session. */
43int client_loop(struct ssh *, int, int, int);
44int client_x11_get_proto(struct ssh *, const char *, const char *,
45 u_int, u_int, char **, char **);
46void client_session2_setup(struct ssh *, int, int, int,
47 const char *, struct termios *, int, struct sshbuf *, char **);
48char *client_request_tun_fwd(struct ssh *, int, int, int,
49 channel_open_fn *, void *);
50void client_stop_mux(void);
51
52/* Escape filter for protocol 2 sessions */
53void *client_new_escape_filter_ctx(int);
54void client_filter_cleanup(struct ssh *, int, void *);
55int client_simple_escape_filter(struct ssh *, Channel *, char *, int);
56
57/* Global request confirmation callbacks */
58typedef void global_confirm_cb(struct ssh *, int, u_int32_t, void *);
59void client_register_global_confirm(global_confirm_cb *, void *);
60
61/* Channel request confirmation callbacks */
62enum confirm_action { CONFIRM_WARN = 0, CONFIRM_CLOSE, CONFIRM_TTY };
63void 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#define SSHMUX_COMMAND_CONNINFO 9 /* Show connection information */
79#define SSHMUX_COMMAND_CHANINFO 10 /* Show channels information */
80
81void muxserver_listen(struct ssh *);
82int muxclient(const char *);
83void mux_exit_message(struct ssh *, Channel *, int);
84void mux_tty_alloc_failed(struct ssh *ssh, Channel *);
85