[gssapi-openssh.git] / openssh / channels.h

/* $OpenBSD: channels.h,v 1.96 2008/06/15 20:06:26 djm Exp $ */

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */
/*
 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef CHANNEL_H
#define CHANNEL_H

/* Definitions for channel types. */
#define SSH_CHANNEL_X11_LISTENER	1	/* Listening for inet X11 conn. */
#define SSH_CHANNEL_PORT_LISTENER	2	/* Listening on a port. */
#define SSH_CHANNEL_OPENING		3	/* waiting for confirmation */
#define SSH_CHANNEL_OPEN		4	/* normal open two-way channel */
#define SSH_CHANNEL_CLOSED		5	/* waiting for close confirmation */
#define SSH_CHANNEL_AUTH_SOCKET		6	/* authentication socket */
#define SSH_CHANNEL_X11_OPEN		7	/* reading first X11 packet */
#define SSH_CHANNEL_INPUT_DRAINING	8	/* sending remaining data to conn */
#define SSH_CHANNEL_OUTPUT_DRAINING	9	/* sending remaining data to app */
#define SSH_CHANNEL_LARVAL		10	/* larval session */
#define SSH_CHANNEL_RPORT_LISTENER	11	/* Listening to a R-style port  */
#define SSH_CHANNEL_CONNECTING		12
#define SSH_CHANNEL_DYNAMIC		13
#define SSH_CHANNEL_ZOMBIE		14	/* Almost dead. */
#define SSH_CHANNEL_MAX_TYPE		15

#define SSH_CHANNEL_PATH_LEN		256

struct Channel;
typedef struct Channel Channel;

typedef void channel_callback_fn(int, void *);
typedef int channel_infilter_fn(struct Channel *, char *, int);
typedef void channel_filter_cleanup_fn(int, void *);
typedef u_char *channel_outfilter_fn(struct Channel *, u_char **, u_int *);

/* Channel success/failure callbacks */
typedef void channel_confirm_cb(int, struct Channel *, void *);
typedef void channel_confirm_abandon_cb(struct Channel *, void *);
struct channel_confirm {
	TAILQ_ENTRY(channel_confirm) entry;
	channel_confirm_cb *cb;
	channel_confirm_abandon_cb *abandon_cb;
	void *ctx;
};
TAILQ_HEAD(channel_confirms, channel_confirm);

/* Context for non-blocking connects */
struct channel_connect {
	char *host;
	int port;
	struct addrinfo *ai, *aitop;
};

struct Channel {
	int     type;		/* channel type/state */
	int     self;		/* my own channel identifier */
	int     remote_id;	/* channel identifier for remote peer */
	u_int   istate;		/* input from channel (state of receive half) */
	u_int   ostate;		/* output to channel  (state of transmit half) */
	int     flags;		/* close sent/rcvd */
	int     rfd;		/* read fd */
	int     wfd;		/* write fd */
	int     efd;		/* extended fd */
	int     sock;		/* sock fd */
	int     ctl_fd;		/* control fd (client sharing) */
	int     isatty;		/* rfd is a tty */
	int     wfd_isatty;	/* wfd is a tty */
	int	client_tty;	/* (client) TTY has been requested */
	int     force_drain;	/* force close on iEOF */
	int     delayed;		/* fdset hack */
	Buffer  input;		/* data read from socket, to be sent over
				 * encrypted connection */
	Buffer  output;		/* data received over encrypted connection for
				 * send on socket */
	Buffer  extended;
	char    path[SSH_CHANNEL_PATH_LEN];
		/* path for unix domain sockets, or host name for forwards */
	int     listening_port;	/* port being listened for forwards */
	int     host_port;	/* remote port to connect for forwards */
	char   *remote_name;	/* remote hostname */

	u_int	remote_window;
	u_int	remote_maxpacket;
	u_int	local_window;
	u_int	local_window_max;
	u_int	local_consumed;
	u_int	local_maxpacket;
	int	dynamic_window;
	int     extended_usage;
	int	single_connection;
	u_int 	tcpwinsz;	

	char   *ctype;		/* type */

	/* callback */
	channel_callback_fn	*open_confirm;
	void			*open_confirm_ctx;
	channel_callback_fn	*detach_user;
	int			detach_close;
	struct channel_confirms	status_confirms;

	/* filter */
	channel_infilter_fn	*input_filter;
	channel_outfilter_fn	*output_filter;
	void			*filter_ctx;
	channel_filter_cleanup_fn *filter_cleanup;

	/* keep boundaries */
	int     		datagram;

	/* non-blocking connect */
	struct channel_connect	connect_ctx;
};

#define CHAN_EXTENDED_IGNORE		0
#define CHAN_EXTENDED_READ		1
#define CHAN_EXTENDED_WRITE		2

/* default window/packet sizes for tcp/x11-fwd-channel */
#define CHAN_SES_PACKET_DEFAULT	(32*1024)
#define CHAN_SES_WINDOW_DEFAULT	(4*CHAN_SES_PACKET_DEFAULT)

#define CHAN_TCP_PACKET_DEFAULT	(32*1024)
#define CHAN_TCP_WINDOW_DEFAULT	(4*CHAN_TCP_PACKET_DEFAULT)

#define CHAN_X11_PACKET_DEFAULT	(16*1024)
#define CHAN_X11_WINDOW_DEFAULT	(4*CHAN_X11_PACKET_DEFAULT)

/* possible input states */
#define CHAN_INPUT_OPEN			0
#define CHAN_INPUT_WAIT_DRAIN		1
#define CHAN_INPUT_WAIT_OCLOSE		2
#define CHAN_INPUT_CLOSED		3

/* possible output states */
#define CHAN_OUTPUT_OPEN		0
#define CHAN_OUTPUT_WAIT_DRAIN		1
#define CHAN_OUTPUT_WAIT_IEOF		2
#define CHAN_OUTPUT_CLOSED		3

#define CHAN_CLOSE_SENT			0x01
#define CHAN_CLOSE_RCVD			0x02
#define CHAN_EOF_SENT			0x04
#define CHAN_EOF_RCVD			0x08

#define CHAN_RBUF	16*1024

/* check whether 'efd' is still in use */
#define CHANNEL_EFD_INPUT_ACTIVE(c) \
	(compat20 && c->extended_usage == CHAN_EXTENDED_READ && \
	(c->efd != -1 || \
	buffer_len(&c->extended) > 0))
#define CHANNEL_EFD_OUTPUT_ACTIVE(c) \
	(compat20 && c->extended_usage == CHAN_EXTENDED_WRITE && \
	c->efd != -1 && (!(c->flags & (CHAN_EOF_RCVD|CHAN_CLOSE_RCVD)) || \
	buffer_len(&c->extended) > 0))

/* channel management */

Channel	*channel_by_id(int);
Channel	*channel_lookup(int);
Channel *channel_new(char *, int, int, int, int, u_int, u_int, int, char *, int);
void	 channel_set_fds(int, int, int, int, int, int, int, u_int);
void	 channel_free(Channel *);
void	 channel_free_all(void);
void	 channel_stop_listening(void);

void	 channel_send_open(int);
void	 channel_request_start(int, char *, int);
void	 channel_register_cleanup(int, channel_callback_fn *, int);
void	 channel_register_open_confirm(int, channel_callback_fn *, void *);
void	 channel_register_filter(int, channel_infilter_fn *,
    channel_outfilter_fn *, channel_filter_cleanup_fn *, void *);
void	 channel_register_status_confirm(int, channel_confirm_cb *,
    channel_confirm_abandon_cb *, void *);
void	 channel_cancel_cleanup(int);
int	 channel_close_fd(int *);
void	 channel_send_window_changes(void);

/* protocol handler */

void	 channel_input_close(int, u_int32_t, void *);
void	 channel_input_close_confirmation(int, u_int32_t, void *);
void	 channel_input_data(int, u_int32_t, void *);
void	 channel_input_extended_data(int, u_int32_t, void *);
void	 channel_input_ieof(int, u_int32_t, void *);
void	 channel_input_oclose(int, u_int32_t, void *);
void	 channel_input_open_confirmation(int, u_int32_t, void *);
void	 channel_input_open_failure(int, u_int32_t, void *);
void	 channel_input_port_open(int, u_int32_t, void *);
void	 channel_input_window_adjust(int, u_int32_t, void *);
void	 channel_input_status_confirm(int, u_int32_t, void *);

/* file descriptor handling (read/write) */

void	 channel_prepare_select(fd_set **, fd_set **, int *, u_int*, int);
void     channel_after_select(fd_set *, fd_set *);
int      channel_output_poll(void);

int      channel_not_very_much_buffered_data(void);
void     channel_close_all(void);
int      channel_still_open(void);
char	*channel_open_message(void);
int	 channel_find_open(void);

/* tcp forwarding */
void	 channel_set_af(int af);
void     channel_permit_all_opens(void);
void	 channel_add_permitted_opens(char *, int);
int	 channel_add_adm_permitted_opens(char *, int);
void	 channel_clear_permitted_opens(void);
void	 channel_clear_adm_permitted_opens(void);
void 	 channel_print_adm_permitted_opens(void);
int      channel_input_port_forward_request(int, int, int, int);
Channel	*channel_connect_to(const char *, u_short, char *, char *);
Channel	*channel_connect_by_listen_address(u_short, char *, char *);
int	 channel_request_remote_forwarding(const char *, u_short,
	     const char *, u_short);
int	 channel_setup_local_fwd_listener(const char *, u_short,
	     const char *, u_short, int, int, int);
void	 channel_request_rforward_cancel(const char *host, u_short port);
int	 channel_setup_remote_fwd_listener(const char *, u_short, int, int, int);
int	 channel_cancel_rport_listener(const char *, u_short);

/* x11 forwarding */

int	 x11_connect_display(void);
int	 x11_create_display_inet(int, int, int, u_int *, int **, int, int);
void     x11_input_open(int, u_int32_t, void *);
void	 x11_request_forwarding_with_spoofing(int, const char *, const char *,
	     const char *);
void	 deny_input_open(int, u_int32_t, void *);

/* agent forwarding */

void	 auth_request_forwarding(void);

/* channel close */

int	 chan_is_dead(Channel *, int);
void	 chan_mark_dead(Channel *);

/* channel events */

void	 chan_rcvd_oclose(Channel *);
void	 chan_rcvd_eow(Channel *);	/* SSH2-only */
void	 chan_read_failed(Channel *);
void	 chan_ibuf_empty(Channel *);

void	 chan_rcvd_ieof(Channel *);
void	 chan_write_failed(Channel *);
void	 chan_obuf_empty(Channel *);

#endif
Commit	Line	Data
5156b1a1	1	/* $OpenBSD: channels.h,v 1.96 2008/06/15 20:06:26 djm Exp $ */
473db5ab	2
3c0ef626	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	/*
473db5ab	15	* Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
3c0ef626	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	*/
3c0ef626	37
	38	#ifndef CHANNEL_H
	39	#define CHANNEL_H
	40
3c0ef626	41	/* Definitions for channel types. */
	42	#define SSH_CHANNEL_X11_LISTENER 1 /* Listening for inet X11 conn. */
	43	#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 */
	46	#define SSH_CHANNEL_CLOSED 5 /* waiting for close confirmation */
	47	#define SSH_CHANNEL_AUTH_SOCKET 6 /* authentication socket */
	48	#define SSH_CHANNEL_X11_OPEN 7 /* reading first X11 packet */
	49	#define SSH_CHANNEL_INPUT_DRAINING 8 /* sending remaining data to conn */
	50	#define SSH_CHANNEL_OUTPUT_DRAINING 9 /* sending remaining data to app */
	51	#define SSH_CHANNEL_LARVAL 10 /* larval session */
	52	#define SSH_CHANNEL_RPORT_LISTENER 11 /* Listening to a R-style port */
	53	#define SSH_CHANNEL_CONNECTING 12
	54	#define SSH_CHANNEL_DYNAMIC 13
	55	#define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */
	56	#define SSH_CHANNEL_MAX_TYPE 15
	57
	58	#define SSH_CHANNEL_PATH_LEN 256
	59
	60	struct Channel;
	61	typedef struct Channel Channel;
	62
	63	typedef void channel_callback_fn(int, void *);
08822d99	64	typedef int channel_infilter_fn(struct Channel , char , int);
5156b1a1	65	typedef void channel_filter_cleanup_fn(int, void *);
08822d99	66	typedef u_char channel_outfilter_fn(struct Channel , u_char *, u_int );
3c0ef626	67
5156b1a1	68	/* Channel success/failure callbacks */
	69	typedef void channel_confirm_cb(int, struct Channel , void );
	70	typedef void channel_confirm_abandon_cb(struct Channel , void );
	71	struct channel_confirm {
	72	TAILQ_ENTRY(channel_confirm) entry;
	73	channel_confirm_cb *cb;
	74	channel_confirm_abandon_cb *abandon_cb;
	75	void *ctx;
	76	};
	77	TAILQ_HEAD(channel_confirms, channel_confirm);
	78
	79	/* Context for non-blocking connects */
	80	struct channel_connect {
	81	char *host;
	82	int port;
	83	struct addrinfo ai, aitop;
	84	};
	85
3c0ef626	86	struct Channel {
	87	int type; /* channel type/state */
	88	int self; /* my own channel identifier */
	89	int remote_id; /* channel identifier for remote peer */
473db5ab	90	u_int istate; /* input from channel (state of receive half) */
473db5ab	91	u_int ostate; /* output to channel (state of transmit half) */
3c0ef626	92	int flags; /* close sent/rcvd */
	93	int rfd; /* read fd */
	94	int wfd; /* write fd */
	95	int efd; /* extended fd */
	96	int sock; /* sock fd */
473db5ab	97	int ctl_fd; /* control fd (client sharing) */
3c0ef626	98	int isatty; /* rfd is a tty */
473db5ab	99	int wfd_isatty; /* wfd is a tty */
473db5ab	100	int client_tty; /* (client) TTY has been requested */
3c0ef626	101	int force_drain; /* force close on iEOF */
	102	int delayed; /* fdset hack */
	103	Buffer input; /* data read from socket, to be sent over
	104	* encrypted connection */
	105	Buffer output; /* data received over encrypted connection for
	106	* send on socket */
	107	Buffer extended;
	108	char path[SSH_CHANNEL_PATH_LEN];
	109	/* path for unix domain sockets, or host name for forwards */
	110	int listening_port; /* port being listened for forwards */
	111	int host_port; /* remote port to connect for forwards */
	112	char remote_name; / remote hostname */
	113
473db5ab	114	u_int remote_window;
	115	u_int remote_maxpacket;
	116	u_int local_window;
	117	u_int local_window_max;
	118	u_int local_consumed;
	119	u_int local_maxpacket;
	120	int dynamic_window;
3c0ef626	121	int extended_usage;
473db5ab	122	int single_connection;
a7213e65	123	u_int tcpwinsz;
3c0ef626	124
	125	char ctype; / type */
	126
	127	/* callback */
5156b1a1	128	channel_callback_fn *open_confirm;
5156b1a1	129	void *open_confirm_ctx;
08822d99	130	channel_callback_fn *detach_user;
08822d99	131	int detach_close;
5156b1a1	132	struct channel_confirms status_confirms;
3c0ef626	133
3c0ef626	134	/* filter */
08822d99	135	channel_infilter_fn *input_filter;
08822d99	136	channel_outfilter_fn *output_filter;
5156b1a1	137	void *filter_ctx;
	138	channel_filter_cleanup_fn *filter_cleanup;
	139
	140	/* keep boundaries */
	141	int datagram;
08822d99	142
5156b1a1	143	/* non-blocking connect */
5156b1a1	144	struct channel_connect connect_ctx;
3c0ef626	145	};
	146
	147	#define CHAN_EXTENDED_IGNORE 0
	148	#define CHAN_EXTENDED_READ 1
	149	#define CHAN_EXTENDED_WRITE 2
	150
	151	/* default window/packet sizes for tcp/x11-fwd-channel */
fa0f0f45	152	#define CHAN_SES_PACKET_DEFAULT (32*1024)
4834571d	153	#define CHAN_SES_WINDOW_DEFAULT (4*CHAN_SES_PACKET_DEFAULT)
4834571d	154
fa0f0f45	155	#define CHAN_TCP_PACKET_DEFAULT (32*1024)
4834571d	156	#define CHAN_TCP_WINDOW_DEFAULT (4*CHAN_TCP_PACKET_DEFAULT)
4834571d	157
fa0f0f45	158	#define CHAN_X11_PACKET_DEFAULT (16*1024)
fa0f0f45	159	#define CHAN_X11_WINDOW_DEFAULT (4*CHAN_X11_PACKET_DEFAULT)
3c0ef626	160
3c0ef626	161	/* possible input states */
473db5ab	162	#define CHAN_INPUT_OPEN 0
	163	#define CHAN_INPUT_WAIT_DRAIN 1
	164	#define CHAN_INPUT_WAIT_OCLOSE 2
	165	#define CHAN_INPUT_CLOSED 3
3c0ef626	166
3c0ef626	167	/* possible output states */
473db5ab	168	#define CHAN_OUTPUT_OPEN 0
	169	#define CHAN_OUTPUT_WAIT_DRAIN 1
	170	#define CHAN_OUTPUT_WAIT_IEOF 2
	171	#define CHAN_OUTPUT_CLOSED 3
3c0ef626	172
	173	#define CHAN_CLOSE_SENT 0x01
	174	#define CHAN_CLOSE_RCVD 0x02
473db5ab	175	#define CHAN_EOF_SENT 0x04
	176	#define CHAN_EOF_RCVD 0x08
	177
08822d99	178	#define CHAN_RBUF 16*1024
08822d99	179
473db5ab	180	/* check whether 'efd' is still in use */
	181	#define CHANNEL_EFD_INPUT_ACTIVE(c) \
	182	(compat20 && c->extended_usage == CHAN_EXTENDED_READ && \
	183	(c->efd != -1 \|\| \
	184	buffer_len(&c->extended) > 0))
	185	#define CHANNEL_EFD_OUTPUT_ACTIVE(c) \
	186	(compat20 && c->extended_usage == CHAN_EXTENDED_WRITE && \
	187	c->efd != -1 && (!(c->flags & (CHAN_EOF_RCVD\|CHAN_CLOSE_RCVD)) \|\| \
	188	buffer_len(&c->extended) > 0))
3c0ef626	189
	190	/* channel management */
	191
08822d99	192	Channel *channel_by_id(int);
3c0ef626	193	Channel *channel_lookup(int);
473db5ab	194	Channel channel_new(char , int, int, int, int, u_int, u_int, int, char *, int);
5156b1a1	195	void channel_set_fds(int, int, int, int, int, int, int, u_int);
3c0ef626	196	void channel_free(Channel *);
	197	void channel_free_all(void);
	198	void channel_stop_listening(void);
	199
	200	void channel_send_open(int);
3c0ef626	201	void channel_request_start(int, char *, int);
08822d99	202	void channel_register_cleanup(int, channel_callback_fn *, int);
5156b1a1	203	void channel_register_open_confirm(int, channel_callback_fn , void );
	204	void channel_register_filter(int, channel_infilter_fn *,
	205	channel_outfilter_fn , channel_filter_cleanup_fn , void *);
	206	void channel_register_status_confirm(int, channel_confirm_cb *,
	207	channel_confirm_abandon_cb , void );
3c0ef626	208	void channel_cancel_cleanup(int);
3c0ef626	209	int channel_close_fd(int *);
473db5ab	210	void channel_send_window_changes(void);
3c0ef626	211
	212	/* protocol handler */
	213
473db5ab	214	void channel_input_close(int, u_int32_t, void *);
	215	void channel_input_close_confirmation(int, u_int32_t, void *);
	216	void channel_input_data(int, u_int32_t, void *);
	217	void channel_input_extended_data(int, u_int32_t, void *);
	218	void channel_input_ieof(int, u_int32_t, void *);
	219	void channel_input_oclose(int, u_int32_t, void *);
	220	void channel_input_open_confirmation(int, u_int32_t, void *);
	221	void channel_input_open_failure(int, u_int32_t, void *);
	222	void channel_input_port_open(int, u_int32_t, void *);
	223	void channel_input_window_adjust(int, u_int32_t, void *);
5156b1a1	224	void channel_input_status_confirm(int, u_int32_t, void *);
3c0ef626	225
	226	/* file descriptor handling (read/write) */
	227
473db5ab	228	void channel_prepare_select(fd_set , fd_set , int , u_int, int);
3c0ef626	229	void channel_after_select(fd_set , fd_set );
fa7499cc	230	int channel_output_poll(void);
3c0ef626	231
	232	int channel_not_very_much_buffered_data(void);
	233	void channel_close_all(void);
	234	int channel_still_open(void);
	235	char *channel_open_message(void);
	236	int channel_find_open(void);
	237
	238	/* tcp forwarding */
	239	void channel_set_af(int af);
	240	void channel_permit_all_opens(void);
	241	void channel_add_permitted_opens(char *, int);
30460aeb	242	int channel_add_adm_permitted_opens(char *, int);
3c0ef626	243	void channel_clear_permitted_opens(void);
30460aeb	244	void channel_clear_adm_permitted_opens(void);
5156b1a1	245	void channel_print_adm_permitted_opens(void);
30460aeb	246	int channel_input_port_forward_request(int, int, int, int);
5156b1a1	247	Channel channel_connect_to(const char , u_short, char , char );
5156b1a1	248	Channel channel_connect_by_listen_address(u_short, char , char *);
30460aeb	249	int channel_request_remote_forwarding(const char *, u_short,
473db5ab	250	const char *, u_short);
473db5ab	251	int channel_setup_local_fwd_listener(const char *, u_short,
a7213e65	252	const char *, u_short, int, int, int);
473db5ab	253	void channel_request_rforward_cancel(const char *host, u_short port);
a7213e65	254	int channel_setup_remote_fwd_listener(const char *, u_short, int, int, int);
473db5ab	255	int channel_cancel_rport_listener(const char *, u_short);
3c0ef626	256
	257	/* x11 forwarding */
	258
	259	int x11_connect_display(void);
a7213e65	260	int x11_create_display_inet(int, int, int, u_int , int *, int, int);
473db5ab	261	void x11_input_open(int, u_int32_t, void *);
473db5ab	262	void x11_request_forwarding_with_spoofing(int, const char , const char ,
5156b1a1	263	const char *);
473db5ab	264	void deny_input_open(int, u_int32_t, void *);
3c0ef626	265
	266	/* agent forwarding */
	267
	268	void auth_request_forwarding(void);
3c0ef626	269
	270	/* channel close */
	271
	272	int chan_is_dead(Channel *, int);
	273	void chan_mark_dead(Channel *);
3c0ef626	274
473db5ab	275	/* channel events */
3c0ef626	276
473db5ab	277	void chan_rcvd_oclose(Channel *);
5156b1a1	278	void chan_rcvd_eow(Channel ); / SSH2-only */
473db5ab	279	void chan_read_failed(Channel *);
473db5ab	280	void chan_ibuf_empty(Channel *);
3c0ef626	281
473db5ab	282	void chan_rcvd_ieof(Channel *);
	283	void chan_write_failed(Channel *);
	284	void chan_obuf_empty(Channel *);
3c0ef626	285
3c0ef626	286	#endif