=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/channels.h,v retrieving revision 1.6 retrieving revision 1.7 diff -u -r1.6 -r1.7 --- src/usr.bin/ssh/channels.h 1999/11/24 19:53:45 1.6 +++ src/usr.bin/ssh/channels.h 2000/03/28 20:31:26 1.7 @@ -1,4 +1,4 @@ -/* RCSID("$Id: channels.h,v 1.6 1999/11/24 19:53:45 markus Exp $"); */ +/* RCSID("$Id: channels.h,v 1.7 2000/03/28 20:31:26 markus Exp $"); */ #ifndef CHANNELS_H #define CHANNELS_H @@ -10,17 +10,18 @@ #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 */ -/* SSH_CHANNEL_AUTH_FD 6 authentication fd */ -#define SSH_CHANNEL_AUTH_SOCKET 7 /* authentication socket */ -/* SSH_CHANNEL_AUTH_SOCKET_FD 8 connection to auth socket */ -#define SSH_CHANNEL_X11_OPEN 9 /* reading first X11 packet */ -#define SSH_CHANNEL_INPUT_DRAINING 10 /* sending remaining data to conn */ -#define SSH_CHANNEL_OUTPUT_DRAINING 11 /* sending remaining data to app */ +#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_MAX_TYPE 11 /* * Data structure for channel data. This is iniailized in channel_allocate * and cleared in channel_free. */ +typedef void channel_callback_fn(int id, void *arg); typedef struct Channel { int type; /* channel type/state */ @@ -29,15 +30,192 @@ /* peer can be reached over encrypted connection, via packet-sent */ int istate; /* input from channel (state of receive half) */ int ostate; /* output to channel (state of transmit half) */ - int sock; /* data socket, linked to this channel */ + int rfd; /* read fd */ + int wfd; /* write fd */ + int efd; /* extended fd */ + int sock; /* sock fd */ 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[200]; /* 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; + + char *ctype; /* type */ + + // callback + channel_callback_fn *cb_fn; + void *cb_arg; + int cb_event; + channel_callback_fn *dettach_user; } Channel; + +#define CHAN_EXTENDED_IGNORE 0 +#define CHAN_EXTENDED_READ 1 +#define CHAN_EXTENDED_WRITE 2 + +void channel_open(int id); +Channel *channel_lookup(int id); + +int +channel_new(char *ctype, int type, int rfd, int wfd, int efd, + int window, int maxpack, int extended_usage, char *remote_name); + +void channel_input_close(int type, int plen); +void channel_input_close_confirmation(int type, int plen); +void channel_input_data(int type, int plen); +void channel_input_ieof(int type, int plen); +void channel_input_oclose(int type, int plen); +void channel_input_open_confirmation(int type, int plen); +void channel_input_open_failure(int type, int plen); +void channel_input_port_open(int type, int plen); +void channel_input_open(int type, int plen); + +/* Sets specific protocol options. */ +void channel_set_options(int hostname_in_open); + +/* + * Allocate a new channel object and set its type and socket. Remote_name + * must have been allocated with xmalloc; this will free it when the channel + * is freed. + */ +int channel_allocate(int type, int sock, char *remote_name); + +/* Free the channel and close its socket. */ +void channel_free(int channel); + +/* Add any bits relevant to channels in select bitmasks. */ +void channel_prepare_select(fd_set * readset, fd_set * writeset); + +/* + * After select, perform any appropriate operations for channels which have + * events pending. + */ +void channel_after_select(fd_set * readset, fd_set * writeset); + +/* If there is data to send to the connection, send some of it now. */ +void channel_output_poll(void); + +/* Returns true if no channel has too much buffered data. */ +int channel_not_very_much_buffered_data(void); + +/* This closes any sockets that are listening for connections; this removes + any unix domain sockets. */ +void channel_stop_listening(void); + +/* + * Closes the sockets of all channels. This is used to close extra file + * descriptors after a fork. + */ +void channel_close_all(void); + +/* Returns the maximum file descriptor number used by the channels. */ +int channel_max_fd(void); + +/* Returns true if there is still an open channel over the connection. */ +int channel_still_open(void); + +/* + * Returns a string containing a list of all open channels. The list is + * suitable for displaying to the user. It uses crlf instead of newlines. + * The caller should free the string with xfree. + */ +char *channel_open_message(void); + +/* + * Initiate forwarding of connections to local port "port" through the secure + * channel to host:port from remote side. This never returns if there was an + * error. + */ +void +channel_request_local_forwarding(u_short port, const char *host, + u_short remote_port, int gateway_ports); + +/* + * Initiate forwarding of connections to port "port" on remote host through + * the secure channel to host:port from local side. This never returns if + * there was an error. This registers that open requests for that port are + * permitted. + */ +void +channel_request_remote_forwarding(u_short port, const char *host, + u_short remote_port); + +/* + * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually + * called by the server, because the user could connect to any port anyway, + * and the server has no way to know but to trust the client anyway. + */ +void channel_permit_all_opens(void); + +/* + * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates + * listening for the port, and sends back a success reply (or disconnect + * message if there was an error). This never returns if there was an error. + */ +void channel_input_port_forward_request(int is_root); + +/* + * Creates a port for X11 connections, and starts listening for it. Returns + * the display name, or NULL if an error was encountered. + */ +char *x11_create_display(int screen); + +/* + * Creates an internet domain socket for listening for X11 connections. + * Returns a suitable value for the DISPLAY variable, or NULL if an error + * occurs. + */ +char *x11_create_display_inet(int screen, int x11_display_offset); + +/* + * This is called when SSH_SMSG_X11_OPEN is received. The packet contains + * the remote channel number. We should do whatever we want, and respond + * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. + */ +void x11_input_open(int type, int plen); + +/* + * Requests forwarding of X11 connections. This should be called on the + * client only. + */ +void x11_request_forwarding(void); + +/* + * Requests forwarding for X11 connections, with authentication spoofing. + * This should be called in the client only. + */ +void x11_request_forwarding_with_spoofing(const char *proto, const char *data); + +/* Sends a message to the server to request authentication fd forwarding. */ +void auth_request_forwarding(void); + +/* + * Returns the name of the forwarded authentication socket. Returns NULL if + * there is no forwarded authentication socket. The returned value points to + * a static buffer. + */ +char *auth_get_socket_name(void); + +/* + * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. + * This starts forwarding authentication requests. + */ +void auth_input_request_forwarding(struct passwd * pw); + +/* This is called to process an SSH_SMSG_AGENT_OPEN message. */ +void auth_input_open_request(int type, int plen); + #endif