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djm@openbsd.orgf1dd1792018-10-04 00:10:11 +00001/* $OpenBSD: channels.h,v 1.132 2018/10/04 00:10:11 djm Exp $ */
Ben Lindstrom05764b92002-03-05 01:53:02 +00002
Damien Millere4340be2000-09-16 13:29:08 +11003/*
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/*
Damien Millerb51ed392002-01-22 23:29:03 +110015 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110016 *
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 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
Ben Lindstrome9c99912001-06-09 00:41:05 +000038#ifndef CHANNEL_H
39#define CHANNEL_H
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41/* Definitions for channel types. */
Damien Miller5428f641999-11-25 11:54:57 +110042#define SSH_CHANNEL_X11_LISTENER 1 /* Listening for inet X11 conn. */
Damien Miller95def091999-11-25 00:26:21 +110043#define SSH_CHANNEL_PORT_LISTENER 2 /* Listening on a port. */
44#define SSH_CHANNEL_OPENING 3 /* waiting for confirmation */
45#define SSH_CHANNEL_OPEN 4 /* normal open two-way channel */
Damien Miller5428f641999-11-25 11:54:57 +110046#define SSH_CHANNEL_CLOSED 5 /* waiting for close confirmation */
Damien Millerb38eff82000-04-01 11:09:21 +100047#define SSH_CHANNEL_AUTH_SOCKET 6 /* authentication socket */
48#define SSH_CHANNEL_X11_OPEN 7 /* reading first X11 packet */
Damien Millerb38eff82000-04-01 11:09:21 +100049#define SSH_CHANNEL_LARVAL 10 /* larval session */
Damien Miller0bc1bd82000-11-13 22:57:25 +110050#define SSH_CHANNEL_RPORT_LISTENER 11 /* Listening to a R-style port */
Ben Lindstrom7ad97102000-12-06 01:42:49 +000051#define SSH_CHANNEL_CONNECTING 12
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +000052#define SSH_CHANNEL_DYNAMIC 13
Ben Lindstromc0dee1a2001-06-05 20:52:50 +000053#define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */
Damien Millere1537f92010-01-26 13:26:22 +110054#define SSH_CHANNEL_MUX_LISTENER 15 /* Listener for mux conn. */
55#define SSH_CHANNEL_MUX_CLIENT 16 /* Conn. to mux slave */
Damien Miller36187092013-06-10 13:07:11 +100056#define SSH_CHANNEL_ABANDONED 17 /* Abandoned session, eg mux */
Damien Miller7acefbb2014-07-18 14:11:24 +100057#define SSH_CHANNEL_UNIX_LISTENER 18 /* Listening on a domain socket. */
58#define SSH_CHANNEL_RUNIX_LISTENER 19 /* Listening to a R-style domain socket. */
markus@openbsd.org8d057842016-09-30 09:19:13 +000059#define SSH_CHANNEL_MUX_PROXY 20 /* proxy channel for mux-slave */
markus@openbsd.org609d7a62017-09-21 19:16:53 +000060#define SSH_CHANNEL_RDYNAMIC_OPEN 21 /* reverse SOCKS, parsing request */
61#define SSH_CHANNEL_RDYNAMIC_FINISH 22 /* reverse SOCKS, finishing connect */
62#define SSH_CHANNEL_MAX_TYPE 23
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Damien Millerff773642011-09-22 21:39:48 +100064#define CHANNEL_CANCEL_PORT_STATIC -1
65
djm@openbsd.org115063a2018-06-06 18:22:41 +000066/* TCP forwarding */
67#define FORWARD_DENY 0
68#define FORWARD_REMOTE (1)
69#define FORWARD_LOCAL (1<<1)
70#define FORWARD_ALLOW (FORWARD_REMOTE|FORWARD_LOCAL)
71
72#define FORWARD_ADM 0x100
73#define FORWARD_USER 0x101
74
markus@openbsd.org2ae666a2017-05-30 14:23:52 +000075struct ssh;
Damien Millerad833b32000-08-23 10:46:23 +100076struct Channel;
77typedef struct Channel Channel;
djm@openbsd.orgdbee4112017-09-12 06:32:07 +000078struct fwd_perm_list;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
djm@openbsd.orgdbee4112017-09-12 06:32:07 +000080typedef void channel_open_fn(struct ssh *, int, int, void *);
81typedef void channel_callback_fn(struct ssh *, int, void *);
82typedef int channel_infilter_fn(struct ssh *, struct Channel *, char *, int);
83typedef void channel_filter_cleanup_fn(struct ssh *, int, void *);
84typedef u_char *channel_outfilter_fn(struct ssh *, struct Channel *,
85 u_char **, size_t *);
Damien Millerad833b32000-08-23 10:46:23 +100086
Damien Millerb84886b2008-05-19 15:05:07 +100087/* Channel success/failure callbacks */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +000088typedef void channel_confirm_cb(struct ssh *, int, struct Channel *, void *);
89typedef void channel_confirm_abandon_cb(struct ssh *, struct Channel *, void *);
Damien Millerb84886b2008-05-19 15:05:07 +100090struct channel_confirm {
91 TAILQ_ENTRY(channel_confirm) entry;
92 channel_confirm_cb *cb;
93 channel_confirm_abandon_cb *abandon_cb;
94 void *ctx;
95};
96TAILQ_HEAD(channel_confirms, channel_confirm);
97
Damien Millerbd740252008-05-19 15:37:09 +100098/* Context for non-blocking connects */
99struct channel_connect {
100 char *host;
101 int port;
102 struct addrinfo *ai, *aitop;
103};
104
Damien Millere1537f92010-01-26 13:26:22 +1100105/* Callbacks for mux channels back into client-specific code */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000106typedef int mux_callback_fn(struct ssh *, struct Channel *);
Damien Millere1537f92010-01-26 13:26:22 +1100107
Damien Millerad833b32000-08-23 10:46:23 +1000108struct Channel {
Damien Miller95def091999-11-25 00:26:21 +1100109 int type; /* channel type/state */
110 int self; /* my own channel identifier */
djm@openbsd.org9f532292017-09-12 06:35:31 +0000111 uint32_t remote_id; /* channel identifier for remote peer */
112 int have_remote_id; /* non-zero if remote_id is valid */
113
Damien Millerabea8ee2002-01-22 23:27:11 +1100114 u_int istate; /* input from channel (state of receive half) */
115 u_int ostate; /* output to channel (state of transmit half) */
Damien Miller33b13562000-04-04 14:38:59 +1000116 int flags; /* close sent/rcvd */
Damien Millerb38eff82000-04-01 11:09:21 +1000117 int rfd; /* read fd */
118 int wfd; /* write fd */
119 int efd; /* extended fd */
120 int sock; /* sock fd */
Damien Millere1537f92010-01-26 13:26:22 +1100121 int ctl_chan; /* control channel (multiplexed connections) */
Damien Miller79438cc2001-02-16 12:34:57 +1100122 int isatty; /* rfd is a tty */
Damien Millerc192a4c2013-08-01 14:29:20 +1000123#ifdef _AIX
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000124 int wfd_isatty; /* wfd is a tty */
Damien Millerc192a4c2013-08-01 14:29:20 +1000125#endif
Darren Tucker5d78de62004-11-05 20:35:44 +1100126 int client_tty; /* (client) TTY has been requested */
Damien Miller4623a752001-10-10 15:03:58 +1000127 int force_drain; /* force close on iEOF */
Damien Millera6508752012-04-22 11:21:10 +1000128 time_t notbefore; /* Pause IO until deadline (time_t) */
Darren Tucker876045b2010-01-08 17:08:00 +1100129 int delayed; /* post-select handlers for newly created
130 * channels are delayed until the first call
djm@openbsd.orgc28a3432015-05-08 06:45:13 +0000131 * to a matching pre-select handler.
Darren Tucker876045b2010-01-08 17:08:00 +1100132 * this way post-select handlers are not
Darren Tucker5d12b8f2013-06-06 08:09:10 +1000133 * accidentally called if a FD gets reused */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000134 struct sshbuf *input; /* data read from socket, to be sent over
Damien Miller95def091999-11-25 00:26:21 +1100135 * encrypted connection */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000136 struct sshbuf *output; /* data received over encrypted connection for
Damien Miller95def091999-11-25 00:26:21 +1100137 * send on socket */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000138 struct sshbuf *extended;
139
Damien Millera1c1b6c2009-01-28 16:29:49 +1100140 char *path;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000141 /* path for unix domain sockets, or host name for forwards */
Damien Miller95def091999-11-25 00:26:21 +1100142 int listening_port; /* port being listened for forwards */
Damien Millerf6dff7c2011-09-22 21:38:52 +1000143 char *listening_addr; /* addr being listened for forwards */
Damien Miller95def091999-11-25 00:26:21 +1100144 int host_port; /* remote port to connect for forwards */
145 char *remote_name; /* remote hostname */
Damien Millerb38eff82000-04-01 11:09:21 +1000146
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000147 u_int remote_window;
148 u_int remote_maxpacket;
149 u_int local_window;
150 u_int local_window_max;
151 u_int local_consumed;
152 u_int local_maxpacket;
Damien Millerb38eff82000-04-01 11:09:21 +1000153 int extended_usage;
Damien Millere7378562001-12-21 14:58:35 +1100154 int single_connection;
Damien Millerb38eff82000-04-01 11:09:21 +1000155
156 char *ctype; /* type */
157
Damien Millere247cc42000-05-07 12:03:14 +1000158 /* callback */
Damien Millerd530f5f2010-05-21 14:57:10 +1000159 channel_open_fn *open_confirm;
Damien Millerb84886b2008-05-19 15:05:07 +1000160 void *open_confirm_ctx;
Damien Miller39eda6e2005-11-05 14:52:50 +1100161 channel_callback_fn *detach_user;
162 int detach_close;
Damien Millerb84886b2008-05-19 15:05:07 +1000163 struct channel_confirms status_confirms;
Damien Millerad833b32000-08-23 10:46:23 +1000164
165 /* filter */
Damien Miller077b2382005-12-31 16:22:32 +1100166 channel_infilter_fn *input_filter;
167 channel_outfilter_fn *output_filter;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000168 void *filter_ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000169 channel_filter_cleanup_fn *filter_cleanup;
Damien Millerd27b9472005-12-13 19:29:02 +1100170
Damien Millerbd740252008-05-19 15:37:09 +1000171 /* keep boundaries */
172 int datagram;
173
174 /* non-blocking connect */
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000175 /* XXX make this a pointer so the structure can be opaque */
Damien Millerbd740252008-05-19 15:37:09 +1000176 struct channel_connect connect_ctx;
Damien Millere1537f92010-01-26 13:26:22 +1100177
178 /* multiplexing protocol hook, called for each packet received */
179 mux_callback_fn *mux_rcb;
180 void *mux_ctx;
Damien Millerd530f5f2010-05-21 14:57:10 +1000181 int mux_pause;
markus@openbsd.org8d057842016-09-30 09:19:13 +0000182 int mux_downstream_id;
Damien Millerad833b32000-08-23 10:46:23 +1000183};
Damien Millerb38eff82000-04-01 11:09:21 +1000184
185#define CHAN_EXTENDED_IGNORE 0
186#define CHAN_EXTENDED_READ 1
187#define CHAN_EXTENDED_WRITE 2
188
Damien Millere4340be2000-09-16 13:29:08 +1100189/* default window/packet sizes for tcp/x11-fwd-channel */
Damien Miller19a59452002-02-19 15:20:57 +1100190#define CHAN_SES_PACKET_DEFAULT (32*1024)
Darren Tucker395ecc22007-06-12 23:38:53 +1000191#define CHAN_SES_WINDOW_DEFAULT (64*CHAN_SES_PACKET_DEFAULT)
Damien Miller19a59452002-02-19 15:20:57 +1100192#define CHAN_TCP_PACKET_DEFAULT (32*1024)
Darren Tucker395ecc22007-06-12 23:38:53 +1000193#define CHAN_TCP_WINDOW_DEFAULT (64*CHAN_TCP_PACKET_DEFAULT)
Damien Miller19a59452002-02-19 15:20:57 +1100194#define CHAN_X11_PACKET_DEFAULT (16*1024)
195#define CHAN_X11_WINDOW_DEFAULT (4*CHAN_X11_PACKET_DEFAULT)
Damien Millere4340be2000-09-16 13:29:08 +1100196
Ben Lindstrome9c99912001-06-09 00:41:05 +0000197/* possible input states */
Damien Millerabea8ee2002-01-22 23:27:11 +1100198#define CHAN_INPUT_OPEN 0
199#define CHAN_INPUT_WAIT_DRAIN 1
200#define CHAN_INPUT_WAIT_OCLOSE 2
201#define CHAN_INPUT_CLOSED 3
Damien Millere4340be2000-09-16 13:29:08 +1100202
Ben Lindstrome9c99912001-06-09 00:41:05 +0000203/* possible output states */
Damien Millerabea8ee2002-01-22 23:27:11 +1100204#define CHAN_OUTPUT_OPEN 0
205#define CHAN_OUTPUT_WAIT_DRAIN 1
206#define CHAN_OUTPUT_WAIT_IEOF 2
207#define CHAN_OUTPUT_CLOSED 3
Ben Lindstrome9c99912001-06-09 00:41:05 +0000208
209#define CHAN_CLOSE_SENT 0x01
210#define CHAN_CLOSE_RCVD 0x02
Ben Lindstromcf159442002-03-26 03:26:24 +0000211#define CHAN_EOF_SENT 0x04
212#define CHAN_EOF_RCVD 0x08
Damien Millere1537f92010-01-26 13:26:22 +1100213#define CHAN_LOCAL 0x10
Ben Lindstromcf159442002-03-26 03:26:24 +0000214
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000215/* Read buffer size */
216#define CHAN_RBUF (16*1024)
217
218/* Hard limit on number of channels */
219#define CHANNELS_MAX_CHANNELS (16*1024)
Damien Miller077b2382005-12-31 16:22:32 +1100220
Ben Lindstromcf159442002-03-26 03:26:24 +0000221/* check whether 'efd' is still in use */
222#define CHANNEL_EFD_INPUT_ACTIVE(c) \
djm@openbsd.org97f4d302017-04-30 23:13:25 +0000223 (c->extended_usage == CHAN_EXTENDED_READ && \
Ben Lindstromcf159442002-03-26 03:26:24 +0000224 (c->efd != -1 || \
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000225 sshbuf_len(c->extended) > 0))
Ben Lindstromcf159442002-03-26 03:26:24 +0000226#define CHANNEL_EFD_OUTPUT_ACTIVE(c) \
djm@openbsd.org97f4d302017-04-30 23:13:25 +0000227 (c->extended_usage == CHAN_EXTENDED_WRITE && \
Darren Tuckerce377c32005-07-14 17:05:51 +1000228 c->efd != -1 && (!(c->flags & (CHAN_EOF_RCVD|CHAN_CLOSE_RCVD)) || \
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000229 sshbuf_len(c->extended) > 0))
230
231/* Add channel management structures to SSH transport instance */
232void channel_init_channels(struct ssh *ssh);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000233
Ben Lindstrome9c99912001-06-09 00:41:05 +0000234/* channel management */
235
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000236Channel *channel_by_id(struct ssh *, int);
djm@openbsd.org9f532292017-09-12 06:35:31 +0000237Channel *channel_by_remote_id(struct ssh *, u_int);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000238Channel *channel_lookup(struct ssh *, int);
239Channel *channel_new(struct ssh *, char *, int, int, int, int,
240 u_int, u_int, int, char *, int);
241void channel_set_fds(struct ssh *, int, int, int, int, int,
242 int, int, u_int);
243void channel_free(struct ssh *, Channel *);
244void channel_free_all(struct ssh *);
245void channel_stop_listening(struct ssh *);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000246
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000247void channel_send_open(struct ssh *, int);
248void channel_request_start(struct ssh *, int, char *, int);
249void channel_register_cleanup(struct ssh *, int,
250 channel_callback_fn *, int);
251void channel_register_open_confirm(struct ssh *, int,
252 channel_open_fn *, void *);
253void channel_register_filter(struct ssh *, int, channel_infilter_fn *,
254 channel_outfilter_fn *, channel_filter_cleanup_fn *, void *);
255void channel_register_status_confirm(struct ssh *, int,
256 channel_confirm_cb *, channel_confirm_abandon_cb *, void *);
257void channel_cancel_cleanup(struct ssh *, int);
258int channel_close_fd(struct ssh *, int *);
259void channel_send_window_changes(struct ssh *);
Damien Millerb38eff82000-04-01 11:09:21 +1000260
markus@openbsd.org8d057842016-09-30 09:19:13 +0000261/* mux proxy support */
262
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000263int channel_proxy_downstream(struct ssh *, Channel *mc);
markus@openbsd.org2ae666a2017-05-30 14:23:52 +0000264int channel_proxy_upstream(Channel *, int, u_int32_t, struct ssh *);
markus@openbsd.org8d057842016-09-30 09:19:13 +0000265
Ben Lindstrome9c99912001-06-09 00:41:05 +0000266/* protocol handler */
Damien Millerb38eff82000-04-01 11:09:21 +1000267
markus@openbsd.org2ae666a2017-05-30 14:23:52 +0000268int channel_input_data(int, u_int32_t, struct ssh *);
269int channel_input_extended_data(int, u_int32_t, struct ssh *);
270int channel_input_ieof(int, u_int32_t, struct ssh *);
271int channel_input_oclose(int, u_int32_t, struct ssh *);
272int channel_input_open_confirmation(int, u_int32_t, struct ssh *);
273int channel_input_open_failure(int, u_int32_t, struct ssh *);
274int channel_input_port_open(int, u_int32_t, struct ssh *);
275int channel_input_window_adjust(int, u_int32_t, struct ssh *);
276int channel_input_status_confirm(int, u_int32_t, struct ssh *);
Damien Millerb38eff82000-04-01 11:09:21 +1000277
Ben Lindstrome9c99912001-06-09 00:41:05 +0000278/* file descriptor handling (read/write) */
Damien Millerb38eff82000-04-01 11:09:21 +1000279
djm@openbsd.org71e5a532017-08-30 03:59:08 +0000280void channel_prepare_select(struct ssh *, fd_set **, fd_set **, int *,
281 u_int*, time_t*);
282void channel_after_select(struct ssh *, fd_set *, fd_set *);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000283void channel_output_poll(struct ssh *);
Damien Millerb38eff82000-04-01 11:09:21 +1000284
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000285int channel_not_very_much_buffered_data(struct ssh *);
286void channel_close_all(struct ssh *);
287int channel_still_open(struct ssh *);
djm@openbsd.orgf1dd1792018-10-04 00:10:11 +0000288const char *channel_format_extended_usage(const Channel *);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000289char *channel_open_message(struct ssh *);
290int channel_find_open(struct ssh *);
Damien Millerb38eff82000-04-01 11:09:21 +1000291
Ben Lindstrom908afed2001-10-03 17:34:59 +0000292/* tcp forwarding */
Damien Miller7acefbb2014-07-18 14:11:24 +1000293struct Forward;
294struct ForwardOptions;
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000295void channel_set_af(struct ssh *, int af);
djm@openbsd.org115063a2018-06-06 18:22:41 +0000296void channel_permit_all(struct ssh *, int);
297void channel_add_permission(struct ssh *, int, int, char *, int);
298void channel_clear_permission(struct ssh *, int, int);
299void channel_disable_admin(struct ssh *, int);
300void channel_update_permission(struct ssh *, int, int);
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000301Channel *channel_connect_to_port(struct ssh *, const char *, u_short,
302 char *, char *, int *, const char **);
303Channel *channel_connect_to_path(struct ssh *, const char *, char *, char *);
304Channel *channel_connect_stdio_fwd(struct ssh *, const char*,
305 u_short, int, int);
306Channel *channel_connect_by_listen_address(struct ssh *, const char *,
307 u_short, char *, char *);
308Channel *channel_connect_by_listen_path(struct ssh *, const char *,
309 char *, char *);
310int channel_request_remote_forwarding(struct ssh *, struct Forward *);
311int channel_setup_local_fwd_listener(struct ssh *, struct Forward *,
312 struct ForwardOptions *);
313int channel_request_rforward_cancel(struct ssh *, struct Forward *);
314int channel_setup_remote_fwd_listener(struct ssh *, struct Forward *,
315 int *, struct ForwardOptions *);
316int channel_cancel_rport_listener(struct ssh *, struct Forward *);
317int channel_cancel_lport_listener(struct ssh *, struct Forward *,
318 int, struct ForwardOptions *);
Darren Tucker1338b9e2011-10-02 18:57:35 +1100319int permitopen_port(const char *);
Damien Millerb38eff82000-04-01 11:09:21 +1000320
Ben Lindstrome9c99912001-06-09 00:41:05 +0000321/* x11 forwarding */
322
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000323void channel_set_x11_refuse_time(struct ssh *, u_int);
324int x11_connect_display(struct ssh *);
325int x11_create_display_inet(struct ssh *, int, int, int, u_int *, int **);
326void x11_request_forwarding_with_spoofing(struct ssh *, int,
327 const char *, const char *, const char *, int);
Damien Millerb38eff82000-04-01 11:09:21 +1000328
Ben Lindstrome9c99912001-06-09 00:41:05 +0000329/* channel close */
Damien Miller33b13562000-04-04 14:38:59 +1000330
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000331int chan_is_dead(struct ssh *, Channel *, int);
332void chan_mark_dead(struct ssh *, Channel *);
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000333
Damien Miller5144df92002-01-22 23:28:45 +1100334/* channel events */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000335
djm@openbsd.orgdbee4112017-09-12 06:32:07 +0000336void chan_rcvd_oclose(struct ssh *, Channel *);
337void chan_rcvd_eow(struct ssh *, Channel *);
338void chan_read_failed(struct ssh *, Channel *);
339void chan_ibuf_empty(struct ssh *, Channel *);
340void chan_rcvd_ieof(struct ssh *, Channel *);
341void chan_write_failed(struct ssh *, Channel *);
342void chan_obuf_empty(struct ssh *, Channel *);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000343
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000344#endif