- (bal) Channels.c and Channels.h -- "Merge Functions, simplify" (draged

   out of ssh Attic)

1 files changed, 60 insertions, 125 deletions

diff --git a/channels.h b/channels.h
index 55d31854..e9d58365 100644
--- a/channels.h
+++ b/channels.h
@@ -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