10badcd8c7
treat failure to create the authentication agent directory in /tmp as a fatal error, but disable agent forwarding. Submitted by: Jan Koum <jkb@yahoo-inc.com>
238 lines
8.2 KiB
C
238 lines
8.2 KiB
C
/* RCSID("$Id: channels.h,v 1.13 2000/05/30 17:23:37 markus Exp $"); */
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#ifndef CHANNELS_H
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#define CHANNELS_H
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/* Definitions for channel types. */
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#define SSH_CHANNEL_FREE 0 /* This channel is free (unused). */
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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_MAX_TYPE 11
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/*
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* Data structure for channel data. This is iniailized in channel_allocate
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* and cleared in channel_free.
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*/
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typedef void channel_callback_fn(int id, void *arg);
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typedef 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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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[200]; /* path for unix domain sockets, or host name
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* 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 *dettach_user;
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} Channel;
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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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void channel_set_fds(int id, int rfd, int wfd, int efd, int extusage);
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void channel_open(int id);
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void channel_request(int id, char *service, int wantconfirm);
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void channel_request_start(int id, char *service, int wantconfirm);
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void channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg);
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void channel_register_cleanup(int id, channel_callback_fn *fn);
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void channel_cancel_cleanup(int id);
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Channel *channel_lookup(int id);
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int
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channel_new(char *ctype, int type, int rfd, int wfd, int efd,
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int window, int maxpack, int extended_usage, char *remote_name);
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void channel_input_channel_request(int type, int plen);
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void channel_input_close(int type, int plen);
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void channel_input_close_confirmation(int type, int plen);
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void channel_input_data(int type, int plen);
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void channel_input_extended_data(int type, int plen);
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void channel_input_ieof(int type, int plen);
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void channel_input_oclose(int type, int plen);
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void channel_input_open_confirmation(int type, int plen);
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void channel_input_open_failure(int type, int plen);
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void channel_input_port_open(int type, int plen);
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void channel_input_window_adjust(int type, int plen);
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void channel_input_open(int type, int plen);
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/* Sets specific protocol options. */
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void channel_set_options(int hostname_in_open);
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/*
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* Allocate a new channel object and set its type and socket. Remote_name
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* must have been allocated with xmalloc; this will free it when the channel
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* is freed.
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*/
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int channel_allocate(int type, int sock, char *remote_name);
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/* Free the channel and close its socket. */
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void channel_free(int channel);
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/* Add any bits relevant to channels in select bitmasks. */
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void channel_prepare_select(fd_set * readset, fd_set * writeset);
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/*
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* After select, perform any appropriate operations for channels which have
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* events pending.
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*/
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void channel_after_select(fd_set * readset, fd_set * writeset);
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/* If there is data to send to the connection, send some of it now. */
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void channel_output_poll(void);
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/* Returns true if no channel has too much buffered data. */
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int channel_not_very_much_buffered_data(void);
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/* This closes any sockets that are listening for connections; this removes
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any unix domain sockets. */
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void channel_stop_listening(void);
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/*
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* Closes the sockets of all channels. This is used to close extra file
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* descriptors after a fork.
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*/
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void channel_close_all(void);
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/* Returns the maximum file descriptor number used by the channels. */
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int channel_max_fd(void);
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/* Returns true if there is still an open channel over the connection. */
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int channel_still_open(void);
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/*
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* Returns a string containing a list of all open channels. The list is
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* suitable for displaying to the user. It uses crlf instead of newlines.
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* The caller should free the string with xfree.
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*/
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char *channel_open_message(void);
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/*
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* Initiate forwarding of connections to local port "port" through the secure
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* channel to host:port from remote side. This never returns if there was an
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* error.
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*/
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void
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channel_request_local_forwarding(u_short port, const char *host,
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u_short remote_port, int gateway_ports);
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/*
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* Initiate forwarding of connections to port "port" on remote host through
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* the secure channel to host:port from local side. This never returns if
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* there was an error. This registers that open requests for that port are
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* permitted.
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*/
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void
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channel_request_remote_forwarding(u_short port, const char *host,
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u_short remote_port);
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/*
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* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually
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* called by the server, because the user could connect to any port anyway,
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* and the server has no way to know but to trust the client anyway.
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*/
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void channel_permit_all_opens(void);
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/*
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* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
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* listening for the port, and sends back a success reply (or disconnect
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* message if there was an error). This never returns if there was an error.
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*/
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void channel_input_port_forward_request(int is_root, int gateway_ports);
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/*
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* Creates a port for X11 connections, and starts listening for it. Returns
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* the display name, or NULL if an error was encountered.
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*/
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char *x11_create_display(int screen);
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/*
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* Creates an internet domain socket for listening for X11 connections.
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* Returns a suitable value for the DISPLAY variable, or NULL if an error
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* occurs.
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*/
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char *x11_create_display_inet(int screen, int x11_display_offset);
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/*
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* This is called when SSH_SMSG_X11_OPEN is received. The packet contains
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* the remote channel number. We should do whatever we want, and respond
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* with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
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*/
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void x11_input_open(int type, int plen);
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/*
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* Requests forwarding of X11 connections. This should be called on the
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* client only.
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*/
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void x11_request_forwarding(void);
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/*
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* Requests forwarding for X11 connections, with authentication spoofing.
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* This should be called in the client only.
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*/
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void
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x11_request_forwarding_with_spoofing(int client_session_id,
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const char *proto, const char *data);
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/* Sends a message to the server to request authentication fd forwarding. */
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void auth_request_forwarding(void);
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/*
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* Returns the name of the forwarded authentication socket. Returns NULL if
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* there is no forwarded authentication socket. The returned value points to
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* a static buffer.
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*/
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char *auth_get_socket_name(void);
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/*
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* This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
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* This starts forwarding authentication requests.
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*/
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int auth_input_request_forwarding(struct passwd * pw);
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/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
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void auth_input_open_request(int type, int plen);
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/* XXX */
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int channel_connect_to(const char *host, u_short host_port);
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int x11_connect_display(void);
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#endif
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