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809744e912
[channels.c channels.h serverloop.c]
improve cleanup/exit logic in ssh2:
stop listening to channels, detach channel users (e.g. sessions).
wait for children (i.e. dying sessions), send exit messages,
cleanup all channels.
234 lines
8.4 KiB
C
234 lines
8.4 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/*
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* Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* RCSID("$OpenBSD: channels.h,v 1.44 2001/07/02 22:52:57 markus Exp $"); */
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#ifndef CHANNEL_H
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#define CHANNEL_H
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#include "buffer.h"
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/* Definitions for channel types. */
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#define SSH_CHANNEL_X11_LISTENER 1 /* Listening for inet X11 conn. */
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#define SSH_CHANNEL_PORT_LISTENER 2 /* Listening on a port. */
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#define SSH_CHANNEL_OPENING 3 /* waiting for confirmation */
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#define SSH_CHANNEL_OPEN 4 /* normal open two-way channel */
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#define SSH_CHANNEL_CLOSED 5 /* waiting for close confirmation */
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#define SSH_CHANNEL_AUTH_SOCKET 6 /* authentication socket */
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#define SSH_CHANNEL_X11_OPEN 7 /* reading first X11 packet */
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#define SSH_CHANNEL_INPUT_DRAINING 8 /* sending remaining data to conn */
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#define SSH_CHANNEL_OUTPUT_DRAINING 9 /* sending remaining data to app */
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#define SSH_CHANNEL_LARVAL 10 /* larval session */
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#define SSH_CHANNEL_RPORT_LISTENER 11 /* Listening to a R-style port */
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#define SSH_CHANNEL_CONNECTING 12
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#define SSH_CHANNEL_DYNAMIC 13
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#define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */
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#define SSH_CHANNEL_MAX_TYPE 15
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#define SSH_CHANNEL_PATH_LEN 30
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struct Channel;
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typedef struct Channel Channel;
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typedef void channel_callback_fn(int, void *);
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typedef int channel_filter_fn(struct Channel *, char *, int);
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struct Channel {
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int type; /* channel type/state */
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int self; /* my own channel identifier */
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int remote_id; /* channel identifier for remote peer */
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/* peer can be reached over encrypted connection, via packet-sent */
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int istate; /* input from channel (state of receive half) */
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int ostate; /* output to channel (state of transmit half) */
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int flags; /* close sent/rcvd */
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int rfd; /* read fd */
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int wfd; /* write fd */
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int efd; /* extended fd */
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int sock; /* sock fd */
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int isatty; /* rfd is a tty */
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Buffer input; /* data read from socket, to be sent over
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* encrypted connection */
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Buffer output; /* data received over encrypted connection for
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* send on socket */
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Buffer extended;
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char path[SSH_CHANNEL_PATH_LEN];
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/* path for unix domain sockets, or host name for forwards */
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int listening_port; /* port being listened for forwards */
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int host_port; /* remote port to connect for forwards */
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char *remote_name; /* remote hostname */
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int remote_window;
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int remote_maxpacket;
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int local_window;
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int local_window_max;
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int local_consumed;
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int local_maxpacket;
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int extended_usage;
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char *ctype; /* type */
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/* callback */
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channel_callback_fn *cb_fn;
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void *cb_arg;
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int cb_event;
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channel_callback_fn *detach_user;
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/* filter */
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channel_filter_fn *input_filter;
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};
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#define CHAN_EXTENDED_IGNORE 0
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#define CHAN_EXTENDED_READ 1
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#define CHAN_EXTENDED_WRITE 2
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/* default window/packet sizes for tcp/x11-fwd-channel */
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#define CHAN_SES_WINDOW_DEFAULT (32*1024)
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#define CHAN_SES_PACKET_DEFAULT (CHAN_SES_WINDOW_DEFAULT/2)
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#define CHAN_TCP_WINDOW_DEFAULT (32*1024)
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#define CHAN_TCP_PACKET_DEFAULT (CHAN_TCP_WINDOW_DEFAULT/2)
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#define CHAN_X11_WINDOW_DEFAULT (4*1024)
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#define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2)
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/* possible input states */
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#define CHAN_INPUT_OPEN 0x01
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#define CHAN_INPUT_WAIT_DRAIN 0x02
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#define CHAN_INPUT_WAIT_OCLOSE 0x04
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#define CHAN_INPUT_CLOSED 0x08
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/* possible output states */
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#define CHAN_OUTPUT_OPEN 0x10
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#define CHAN_OUTPUT_WAIT_DRAIN 0x20
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#define CHAN_OUTPUT_WAIT_IEOF 0x40
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#define CHAN_OUTPUT_CLOSED 0x80
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#define CHAN_CLOSE_SENT 0x01
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#define CHAN_CLOSE_RCVD 0x02
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/* channel management */
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Channel *channel_lookup(int);
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Channel *channel_new(char *, int, int, int, int, int, int, int, char *, int);
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void channel_set_fds(int, int, int, int, int, int);
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void channel_free(Channel *);
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void channel_free_all(void);
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void channel_detach_all(void);
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void channel_stop_listening(void);
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void channel_send_open(int);
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void channel_request(int, char *, int);
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void channel_request_start(int, char *, int);
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void channel_register_callback(int, int mtype, channel_callback_fn *, void *);
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void channel_register_cleanup(int, channel_callback_fn *);
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void channel_register_filter(int, channel_filter_fn *);
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void channel_cancel_cleanup(int);
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/* protocol handler */
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void channel_input_channel_request(int, int, void *);
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void channel_input_close(int, int, void *);
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void channel_input_close_confirmation(int, int, void *);
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void channel_input_data(int, int, void *);
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void channel_input_extended_data(int, int, void *);
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void channel_input_ieof(int, int, void *);
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void channel_input_oclose(int, int, void *);
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void channel_input_open_confirmation(int, int, void *);
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void channel_input_open_failure(int, int, void *);
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void channel_input_port_open(int, int, void *);
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void channel_input_window_adjust(int, int, void *);
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/* file descriptor handling (read/write) */
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void channel_prepare_select(fd_set **, fd_set **, int *, int);
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void channel_after_select(fd_set *, fd_set *);
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void channel_output_poll(void);
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int channel_not_very_much_buffered_data(void);
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void channel_close_all(void);
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void channel_free_all(void);
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int channel_still_open(void);
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char *channel_open_message(void);
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int channel_find_open(void);
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/* channel_tcpfwd.c */
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void channel_permit_all_opens(void);
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void channel_add_permitted_opens(char *, int);
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void channel_clear_permitted_opens(void);
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void channel_input_port_forward_request(int, int);
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int channel_connect_to(const char *, u_short);
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int channel_connect_by_listen_address(u_short);
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void channel_request_remote_forwarding(u_short, const char *, u_short);
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int channel_request_local_forwarding(u_short, const char *, u_short, int);
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int
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channel_request_forwarding(const char *, u_short, const char *, u_short, int,
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int);
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/* x11 forwarding */
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int x11_connect_display(void);
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char *x11_create_display(int);
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char *x11_create_display_inet(int, int);
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void x11_input_open(int, int, void *);
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void x11_request_forwarding(void);
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void x11_request_forwarding_with_spoofing(int, const char *, const char *);
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void deny_input_open(int, int, void *);
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/* agent forwarding */
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void auth_request_forwarding(void);
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char *auth_get_socket_name(void);
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void auth_sock_cleanup_proc(void *);
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int auth_input_request_forwarding(struct passwd *);
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void auth_input_open_request(int, int, void *);
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/* channel close */
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int chan_is_dead(Channel *);
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void chan_mark_dead(Channel *);
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void chan_init_iostates(Channel *);
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void chan_init(void);
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typedef void chan_event_fn(Channel *);
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/* for the input state */
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extern chan_event_fn *chan_rcvd_oclose;
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extern chan_event_fn *chan_read_failed;
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extern chan_event_fn *chan_ibuf_empty;
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/* for the output state */
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extern chan_event_fn *chan_rcvd_ieof;
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extern chan_event_fn *chan_write_failed;
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extern chan_event_fn *chan_obuf_empty;
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#endif
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