diff options
Diffstat (limited to 'channels.h')
| -rw-r--r-- | channels.h | 185 |
1 files changed, 60 insertions, 125 deletions
@@ -32,10 +32,10 @@ * (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 1.33 2001/05/28 23:14:49 markus Exp $"); */ +/* RCSID("$OpenBSD: channels.h,v 1.35 2001/05/31 10:30:15 markus Exp $"); */ -#ifndef CHANNELS_H -#define CHANNELS_H +#ifndef CHANNEL_H +#define CHANNEL_H #include "buffer.h" @@ -124,21 +124,42 @@ struct Channel { #define CHAN_X11_WINDOW_DEFAULT (4*1024) #define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2) +/* possible input states */ +#define CHAN_INPUT_OPEN 0x01 +#define CHAN_INPUT_WAIT_DRAIN 0x02 +#define CHAN_INPUT_WAIT_OCLOSE 0x04 +#define CHAN_INPUT_CLOSED 0x08 -void channel_open(int id); +/* possible output states */ +#define CHAN_OUTPUT_OPEN 0x10 +#define CHAN_OUTPUT_WAIT_DRAIN 0x20 +#define CHAN_OUTPUT_WAIT_IEOF 0x40 +#define CHAN_OUTPUT_CLOSED 0x80 + +#define CHAN_CLOSE_SENT 0x01 +#define CHAN_CLOSE_RCVD 0x02 + + +/* channel management */ + +Channel *channel_lookup(int id); +Channel * +channel_new(char *ctype, int type, int rfd, int wfd, int efd, + int window, int maxpack, int extusage, char *remote_name, int nonblock); +void +channel_set_fds(int id, int rfd, int wfd, int efd, + int extusage, int nonblock); +void channel_free(Channel *c); + +void channel_send_open(int id); void channel_request(int id, char *service, int wantconfirm); void channel_request_start(int id, char *service, int wantconfirm); void channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg); void channel_register_cleanup(int id, channel_callback_fn *fn); void channel_register_filter(int id, channel_filter_fn *fn); void channel_cancel_cleanup(int id); -Channel *channel_lookup(int id); -void -channel_set_fds(int id, int rfd, int wfd, int efd, - int extusage, int nonblock); - -void deny_input_open(int type, int plen, void *ctxt); +/* protocol handler */ void channel_input_channel_request(int type, int plen, void *ctxt); void channel_input_close(int type, int plen, void *ctxt); @@ -152,66 +173,22 @@ void channel_input_open_failure(int type, int plen, void *ctxt); void channel_input_port_open(int type, int plen, void *ctxt); void channel_input_window_adjust(int type, int plen, void *ctxt); -/* 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. - */ -Channel * -channel_new(char *ctype, int type, int rfd, int wfd, int efd, - int window, int maxpack, int extended_usage, char *remote_name, - int nonblock); - -/* Free the channel and close its socket. */ -void channel_free(Channel *c); +/* file descriptor handling (read/write) */ -/* - * Allocate/update select bitmasks and add any bits relevant to channels in - * select bitmasks. - */ void channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, int rekeying); - -/* - * 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 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); +int channel_find_open(void); -/* - * Initiate forwarding of connections to local port "port" through the secure - * channel to host:port from remote side. - */ +/* channel_tcpfwd.c */ int channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, u_short port_to_connect, int gateway_ports); @@ -219,95 +196,53 @@ int channel_request_forwarding(const char *listen_address, u_short listen_port, const char *host_to_connect, u_short port_to_connect, int gateway_ports, int remote_fwd); - -/* - * 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 if permitted_opens[] is empty. 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); - -/* Add host/port to list of allowed targets for port forwarding */ void channel_add_permitted_opens(char *host, int port); - -/* Flush list */ void channel_clear_permitted_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, int gateway_ports); +int channel_connect_to(const char *host, u_short host_port); +int channel_connect_by_listen_adress(u_short listen_port); -/* - * 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); +/* x11 forwarding */ -/* - * Creates an internet domain socket for listening for X11 connections. - * Returns a suitable value for the DISPLAY variable, or NULL if an error - * occurs. - */ +int x11_connect_display(void); +//int x11_check_cookie(Buffer *b); +char *x11_create_display(int screen); 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, void *ctxt); - -/* - * 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(int client_session_id, const char *proto, const char *data); +void deny_input_open(int type, int plen, void *ctxt); -/* Sends a message to the server to request authentication fd forwarding. */ -void auth_request_forwarding(void); +/* agent forwarding */ -/* - * 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. - */ +void auth_request_forwarding(void); char *auth_get_socket_name(void); - -/* - * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. - * This starts forwarding authentication requests. - */ int 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, void *ctxt); -/* XXX */ -int channel_connect_to(const char *host, u_short host_port); -int channel_connect_by_listen_adress(u_short listen_port); -int x11_connect_display(void); +/* channel close */ -int channel_find_open(void); +typedef void chan_event_fn(Channel * c); + +/* 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; + +int chan_is_dead(Channel * c); +void chan_mark_dead(Channel * c); +void chan_init_iostates(Channel * c); +void chan_init(void); #endif |