channels.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* $OpenBSD: channels.h,v 1.70 2002/06/24 14:33:27 markus Exp $ */
#ifndef _CHANNELS_H
#define _CHANNELS_H
#pragma ident "%Z%%M% %I% %E% SMI"
#ifdef __cplusplus
extern "C" {
#endif
/*
* 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
*
* 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.
*/
#include "buffer.h"
/* Definitions for channel types. */
#define SSH_CHANNEL_CONNECTING 12
#define SSH_CHANNEL_DYNAMIC 13
#define SSH_CHANNEL_MAX_TYPE 15
#define SSH_CHANNEL_PATH_LEN 256
struct Channel;
typedef void channel_callback_fn(int, void *);
typedef int channel_filter_fn(struct Channel *, char *, int);
struct Channel {
int self; /* my own channel identifier */
int remote_id; /* channel identifier for remote peer */
int wait_for_exit; /* no close till after exit-status is sent */
int rfd; /* read fd */
int wfd; /* write fd */
int efd; /* extended fd */
int sock; /* sock fd */
int isatty; /* rfd is a tty */
int wfd_isatty; /* wfd is a tty */
int force_drain; /* force close on iEOF */
int delayed; /* fdset hack */
* encrypted connection */
* send on socket */
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 */
int extended_usage;
int single_connection;
char *ctype; /* type */
/* callback */
/* filter */
};
#define CHAN_EXTENDED_IGNORE 0
#define CHAN_EXTENDED_READ 1
#define CHAN_EXTENDED_WRITE 2
/* default window/packet sizes for tcp/x11-fwd-channel */
/* 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
/* check whether 'efd' is still in use */
#define CHANNEL_EFD_INPUT_ACTIVE(c) \
(c->efd != -1 || \
buffer_len(&c->extended) > 0))
#define CHANNEL_EFD_OUTPUT_ACTIVE(c) \
buffer_len(&c->extended) > 0))
/* channel management */
Channel *channel_lookup(int);
void channel_set_fds(int, int, int, int, int, int, u_int);
void channel_set_wait_for_exit(int, 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 *);
void channel_register_confirm(int, channel_callback_fn *);
void channel_register_filter(int, channel_filter_fn *);
void channel_cancel_cleanup(int);
int channel_close_fd(int *);
/* 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_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);
void channel_clear_permitted_opens(void);
void channel_input_port_forward_request(int, int);
int channel_connect_to(const char *, u_short);
int channel_setup_remote_fwd_listener(const char *, u_short, int);
/* x11 forwarding */
int x11_connect_display(void);
int x11_create_display_inet(int, int, int, u_int *);
void x11_input_open(int, u_int32_t, void *);
void x11_request_forwarding_with_spoofing(int, const char *, const char *);
void deny_input_open(int, u_int32_t, void *);
/* agent forwarding */
void auth_request_forwarding(void);
void auth_input_open_request(int, u_int32_t, void *);
/* channel close */
int chan_is_dead(Channel *, int);
void chan_mark_dead(Channel *);
/* channel events */
void chan_rcvd_oclose(Channel *);
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 *);
#ifdef __cplusplus
}
#endif
#endif /* _CHANNELS_H */