X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/8ab5f6b2f33bb1118d2e9414e4dcfd8a4ec0d7ff..HEAD:/channels.h diff --git a/channels.h b/channels.h index 3422d964..cc71885f 100644 --- a/channels.h +++ b/channels.h @@ -1,3 +1,5 @@ +/* $OpenBSD: channels.h,v 1.103 2010/01/26 01:28:35 djm Exp $ */ + /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -32,13 +34,10 @@ * (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 1.59 2002/01/14 13:57:03 markus Exp $"); */ #ifndef CHANNEL_H #define CHANNEL_H -#include "buffer.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. */ @@ -54,15 +53,38 @@ #define SSH_CHANNEL_CONNECTING 12 #define SSH_CHANNEL_DYNAMIC 13 #define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */ -#define SSH_CHANNEL_MAX_TYPE 15 - -#define SSH_CHANNEL_PATH_LEN 256 +#define SSH_CHANNEL_MUX_LISTENER 15 /* Listener for mux conn. */ +#define SSH_CHANNEL_MUX_CLIENT 16 /* Conn. to mux slave */ +#define SSH_CHANNEL_MAX_TYPE 17 struct Channel; typedef struct Channel Channel; typedef void channel_callback_fn(int, void *); -typedef int channel_filter_fn(struct Channel *, char *, int); +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 */ @@ -75,39 +97,60 @@ struct Channel { 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 */ + int wfd_isatty; /* wfd is a tty */ + int client_tty; /* (client) TTY has been requested */ int force_drain; /* force close on iEOF */ - int delayed; /* fdset hack */ + 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 + * accidenly 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[SSH_CHANNEL_PATH_LEN]; + char *path; /* 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; + 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_callback_fn *cb_fn; - void *cb_arg; - int cb_event; + channel_callback_fn *open_confirm; + void *open_confirm_ctx; channel_callback_fn *detach_user; + int detach_close; + struct channel_confirms status_confirms; /* filter */ - channel_filter_fn *input_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; }; #define CHAN_EXTENDED_IGNORE 0 @@ -115,12 +158,12 @@ struct Channel { #define CHAN_EXTENDED_WRITE 2 /* default window/packet sizes for tcp/x11-fwd-channel */ -#define CHAN_SES_WINDOW_DEFAULT (32*1024) -#define CHAN_SES_PACKET_DEFAULT (CHAN_SES_WINDOW_DEFAULT/2) -#define CHAN_TCP_WINDOW_DEFAULT (32*1024) -#define CHAN_TCP_PACKET_DEFAULT (CHAN_TCP_WINDOW_DEFAULT/2) -#define CHAN_X11_WINDOW_DEFAULT (4*1024) -#define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2) +#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 @@ -136,28 +179,46 @@ struct Channel { #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, int, int, int, char *, int); -void channel_set_fds(int, int, int, int, int, 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(int, char *, int); void channel_request_start(int, char *, int); -void channel_register_callback(int, int mtype, channel_callback_fn *, void *); -void channel_register_cleanup(int, channel_callback_fn *); -void channel_register_filter(int, channel_filter_fn *); +void channel_register_cleanup(int, channel_callback_fn *, int); +void channel_register_open_confirm(int, channel_callback_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 */ -void channel_input_channel_request(int, u_int32_t, void *); void channel_input_close(int, u_int32_t, void *); void channel_input_close_confirmation(int, u_int32_t, void *); void channel_input_data(int, u_int32_t, void *); @@ -168,10 +229,11 @@ void channel_input_open_confirmation(int, u_int32_t, void *); void channel_input_open_failure(int, u_int32_t, void *); void channel_input_port_open(int, u_int32_t, void *); void channel_input_window_adjust(int, u_int32_t, void *); +void channel_input_status_confirm(int, u_int32_t, void *); /* file descriptor handling (read/write) */ -void channel_prepare_select(fd_set **, fd_set **, int *, int*, int); +void channel_prepare_select(fd_set **, fd_set **, int *, u_int*, int); void channel_after_select(fd_set *, fd_set *); void channel_output_poll(void); @@ -185,31 +247,34 @@ int channel_find_open(void); 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_clear_permitted_opens(void); -void channel_input_port_forward_request(int, int); -int channel_connect_to(const char *, u_short); -int channel_connect_by_listen_address(u_short); -void channel_request_remote_forwarding(u_short, const char *, u_short); -int channel_request_local_forwarding(u_short, const char *, u_short, int); -int -channel_request_forwarding(const char *, u_short, const char *, u_short, int, - int); +void channel_clear_adm_permitted_opens(void); +void channel_print_adm_permitted_opens(void); +int channel_input_port_forward_request(int, int); +Channel *channel_connect_to(const char *, u_short, char *, char *); +Channel *channel_connect_stdio_fwd(const char*, u_short, int, int); +Channel *channel_connect_by_listen_address(u_short, char *, char *); +int channel_request_remote_forwarding(const char *, u_short, + const char *, u_short); +int channel_setup_local_fwd_listener(const char *, u_short, + const char *, u_short, int); +void channel_request_rforward_cancel(const char *host, u_short port); +int channel_setup_remote_fwd_listener(const char *, u_short, int *, int); +int channel_cancel_rport_listener(const char *, u_short); /* x11 forwarding */ int x11_connect_display(void); -int x11_create_display_inet(int, int, int); +int x11_create_display_inet(int, int, int, u_int *, int **); void x11_input_open(int, u_int32_t, void *); -void x11_request_forwarding_with_spoofing(int, const char *, const char *); +void x11_request_forwarding_with_spoofing(int, const char *, const char *, + const char *); void deny_input_open(int, u_int32_t, void *); /* agent forwarding */ void auth_request_forwarding(void); -char *auth_get_socket_name(void); -void auth_sock_cleanup_proc(void *); -int auth_input_request_forwarding(struct passwd *); -void auth_input_open_request(int, u_int32_t, void *); /* channel close */ @@ -219,6 +284,7 @@ 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 *);