316 lines
12 KiB
C
316 lines
12 KiB
C
/* $OpenBSD: channels.h,v 1.118 2015/07/01 02:26:31 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_MUX_LISTENER 15 /* Listener for mux conn. */
|
|
#define SSH_CHANNEL_MUX_CLIENT 16 /* Conn. to mux slave */
|
|
#define SSH_CHANNEL_ABANDONED 17 /* Abandoned session, eg mux */
|
|
#define SSH_CHANNEL_UNIX_LISTENER 18 /* Listening on a domain socket. */
|
|
#define SSH_CHANNEL_RUNIX_LISTENER 19 /* Listening to a R-style domain socket. */
|
|
#define SSH_CHANNEL_MAX_TYPE 20
|
|
|
|
#define CHANNEL_CANCEL_PORT_STATIC -1
|
|
|
|
struct Channel;
|
|
typedef struct Channel Channel;
|
|
|
|
typedef void channel_open_fn(int, int, void *);
|
|
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;
|
|
};
|
|
|
|
/* Callbacks for mux channels back into client-specific code */
|
|
typedef int mux_callback_fn(struct Channel *);
|
|
|
|
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_chan; /* control channel (multiplexed connections) */
|
|
int isatty; /* rfd is a tty */
|
|
#ifdef _AIX
|
|
int wfd_isatty; /* wfd is a tty */
|
|
#endif
|
|
int client_tty; /* (client) TTY has been requested */
|
|
int force_drain; /* force close on iEOF */
|
|
time_t notbefore; /* Pause IO until deadline (time_t) */
|
|
int delayed; /* post-select handlers for newly created
|
|
* channels are delayed until the first call
|
|
* to a matching pre-select handler.
|
|
* this way post-select handlers are not
|
|
* accidentally called if a FD gets reused */
|
|
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;
|
|
/* path for unix domain sockets, or host name for forwards */
|
|
int listening_port; /* port being listened for forwards */
|
|
char *listening_addr; /* addr 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 extended_usage;
|
|
int single_connection;
|
|
|
|
char *ctype; /* type */
|
|
|
|
/* callback */
|
|
channel_open_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;
|
|
|
|
/* multiplexing protocol hook, called for each packet received */
|
|
mux_callback_fn *mux_rcb;
|
|
void *mux_ctx;
|
|
int mux_pause;
|
|
};
|
|
|
|
#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 (64*CHAN_SES_PACKET_DEFAULT)
|
|
#define CHAN_TCP_PACKET_DEFAULT (32*1024)
|
|
#define CHAN_TCP_WINDOW_DEFAULT (64*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_LOCAL 0x10
|
|
|
|
#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_open_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 */
|
|
|
|
int channel_input_close(int, u_int32_t, void *);
|
|
int channel_input_close_confirmation(int, u_int32_t, void *);
|
|
int channel_input_data(int, u_int32_t, void *);
|
|
int channel_input_extended_data(int, u_int32_t, void *);
|
|
int channel_input_ieof(int, u_int32_t, void *);
|
|
int channel_input_oclose(int, u_int32_t, void *);
|
|
int channel_input_open_confirmation(int, u_int32_t, void *);
|
|
int channel_input_open_failure(int, u_int32_t, void *);
|
|
int channel_input_port_open(int, u_int32_t, void *);
|
|
int channel_input_window_adjust(int, u_int32_t, void *);
|
|
int 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*,
|
|
time_t*, 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 */
|
|
struct Forward;
|
|
struct ForwardOptions;
|
|
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_disable_adm_local_opens(void);
|
|
void channel_update_permitted_opens(int, 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, struct ForwardOptions *);
|
|
Channel *channel_connect_to_port(const char *, u_short, char *, char *);
|
|
Channel *channel_connect_to_path(const char *, char *, char *);
|
|
Channel *channel_connect_stdio_fwd(const char*, u_short, int, int);
|
|
Channel *channel_connect_by_listen_address(const char *, u_short,
|
|
char *, char *);
|
|
Channel *channel_connect_by_listen_path(const char *, char *, char *);
|
|
int channel_request_remote_forwarding(struct Forward *);
|
|
int channel_setup_local_fwd_listener(struct Forward *, struct ForwardOptions *);
|
|
int channel_request_rforward_cancel(struct Forward *);
|
|
int channel_setup_remote_fwd_listener(struct Forward *, int *, struct ForwardOptions *);
|
|
int channel_cancel_rport_listener(struct Forward *);
|
|
int channel_cancel_lport_listener(struct Forward *, int, struct ForwardOptions *);
|
|
int permitopen_port(const char *);
|
|
|
|
/* x11 forwarding */
|
|
|
|
void channel_set_x11_refuse_time(u_int);
|
|
int x11_connect_display(void);
|
|
int x11_create_display_inet(int, int, int, u_int *, int **);
|
|
int x11_input_open(int, u_int32_t, void *);
|
|
void x11_request_forwarding_with_spoofing(int, const char *, const char *,
|
|
const char *, int);
|
|
int 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
|