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openssh-portable/channels.h

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/*
* 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 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.
*/
/* RCSID("$OpenBSD: channels.h,v 1.57 2002/01/13 21:31:20 markus Exp $"); */
#ifndef CHANNEL_H
#define CHANNEL_H
#include "buffer.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_filter_fn(struct Channel *, char *, int);
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 isatty; /* rfd is a tty */
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 */
int remote_window;
int remote_maxpacket;
int local_window;
int local_window_max;
int local_consumed;
int local_maxpacket;
int extended_usage;
int single_connection;
char *ctype; /* type */
/* callback */
channel_callback_fn *cb_fn;
void *cb_arg;
int cb_event;
channel_callback_fn *detach_user;
/* filter */
channel_filter_fn *input_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 */
#define CHAN_SES_WINDOW_DEFAULT (32*1024)
#define CHAN_SES_PACKET_DEFAULT (CHAN_SES_WINDOW_DEFAULT/2)
#define CHAN_TCP_WINDOW_DEFAULT (32*1024)
#define CHAN_TCP_PACKET_DEFAULT (CHAN_TCP_WINDOW_DEFAULT/2)
#define CHAN_X11_WINDOW_DEFAULT (4*1024)
#define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2)
/* 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
/* channel management */
Channel *channel_lookup(int);
Channel *channel_new(char *, int, int, int, int, int, int, int, char *, int);
void channel_set_fds(int, int, int, int, int, int);
void channel_free(Channel *);
void channel_free_all(void);
void channel_stop_listening(void);
void channel_send_open(int);
void channel_request(int, char *, int);
void channel_request_start(int, char *, int);
void channel_register_callback(int, int mtype, channel_callback_fn *, void *);
void channel_register_cleanup(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_channel_request(int, u_int32_t, void *);
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 *);
/* file descriptor handling (read/write) */
void channel_prepare_select(fd_set **, fd_set **, int *, int*, int);
void channel_after_select(fd_set *, fd_set *);
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_connect_by_listen_address(u_short);
void channel_request_remote_forwarding(u_short, const char *, u_short);
int channel_request_local_forwarding(u_short, const char *, u_short, int);
int
channel_request_forwarding(const char *, u_short, const char *, u_short, int,
int);
/* x11 forwarding */
int x11_connect_display(void);
int x11_create_display_inet(int, int, 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);
char *auth_get_socket_name(void);
void auth_sock_cleanup_proc(void *);
int auth_input_request_forwarding(struct passwd *);
void auth_input_open_request(int, u_int32_t, void *);
/* channel close */
int chan_is_dead(Channel *, int);
void chan_mark_dead(Channel *);
void chan_init_iostates(Channel *);
void chan_init(void);
typedef void chan_event_fn(Channel *);
/* for the input state */
extern chan_event_fn *chan_rcvd_oclose;
extern chan_event_fn *chan_read_failed;
extern chan_event_fn *chan_ibuf_empty;
/* for the output state */
extern chan_event_fn *chan_rcvd_ieof;
extern chan_event_fn *chan_write_failed;
extern chan_event_fn *chan_obuf_empty;
#endif
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