Preliminary support for opening data-transfer interfaces

src/include/gpxe/open.h

@@ -0,0 +1,81 @@
+#ifndef _GPXE_OPEN_H
+#define _GPXE_OPEN_H
+
+/** @file
+ *
+ * Data transfer interface opening
+ *
+ */
+
+#include <gpxe/tables.h>
+
+struct xfer_interface;
+struct uri;
+struct sockaddr;
+
+/** Location types */
+enum {
+	/** Location is a URI string
+	 *
+	 * Parameter list for open() is:
+	 *
+	 * const char *uri_string;
+	 */
+	LOCATION_URI = 1,
+	/** Location is a socket
+	 *
+	 * Parameter list for open() is:
+	 *
+	 * 
+	 */
+	LOCATION_SOCKET,
+};
+
+/** A URI opener */
+struct uri_opener {
+	/** URI protocol name
+	 *
+	 * This is the "scheme" portion of the URI, e.g. "http" or
+	 * "file".
+	 */
+	const char *scheme;
+	/** Open URI
+	 *
+	 * @v xfer		Data-transfer interface
+	 * @v uri		URI
+	 * @ret rc		Return status code
+	 *
+	 * This method takes ownership of the URI structure, and is
+	 * responsible for eventually calling free_uri().
+	 */
+	int ( * open ) ( struct xfer_interface *xfer, struct uri *uri );
+};
+
+/** Register a URI opener */
+#define __uri_opener __table ( struct uri_opener, uri_openers, 01 )
+
+/** A socket opener */
+struct socket_opener {
+	/** Communication domain (e.g. PF_INET) */
+	int domain;
+	/** Communication semantics (e.g. SOCK_STREAM) */
+	int type;
+	/** Open socket
+	 *
+	 * @v xfer		Data-transfer interface
+	 * @v sa		Socket address
+	 * @ret rc		Return status code
+	 */
+	int ( * open ) ( struct xfer_interface *xfer, struct sockaddr *sa );
+};
+
+/** Register a socket opener */
+#define __socket_opener __table ( struct socket_opener, socket_openers, 01 )
+
+extern int open_uri ( struct xfer_interface *xfer, const char *uri_string );
+extern int open_socket ( struct xfer_interface *xfer,
+			 int domain, int type, struct sockaddr *sa );
+extern int vopen ( struct xfer_interface *xfer, int type, va_list args );
+extern int open ( struct xfer_interface *xfer, int type, ... );
+
+#endif /* _GPXE_OPEN_H */

src/include/gpxe/xfer.h

@@ -8,6 +8,7 @@
  */
 
 #include <stddef.h>
+#include <stdarg.h>
 #include <gpxe/interface.h>
 #include <gpxe/iobuf.h>
 
@@ -15,10 +16,38 @@ struct xfer_interface;
 
 /** Data transfer interface operations */
 struct xfer_interface_operations {
+
+	/* Missing features:
+	 *
+	 * notification of non-close status - e.g. connected/opened, ...
+	 *
+	 * seek
+	 *
+	 * prompt for data delivery
+	 *
+	 * I/O buffer preparation
+	 *
+	 */
+
+
+	/** Close interface
+	 *
+	 * @v xfer		Data-transfer interface
+	 * @v rc		Reason for close
+	 */
+	void ( * close ) ( struct xfer_interface *xfer, int rc );
+	/** Redirect to new location
+	 *
+	 * @v xfer		Data-transfer interface
+	 * @v type		New location type
+	 * @v args		Remaining arguments depend upon location type
+	 * @ret rc		Return status code
+	 */
+	int ( * vredirect ) ( struct xfer_interface *xfer, int type,
+			      va_list args );
 	/** Deliver datagram
 	 *
 	 * @v xfer		Data-transfer interface
-	 * @v src		Source interface
 	 * @v iobuf		Datagram I/O buffer
 	 * @ret rc		Return status code
 	 *
@@ -27,12 +56,10 @@ struct xfer_interface_operations {
 	 * deliver_as_raw().
 	 */
 	int ( * deliver ) ( struct xfer_interface *xfer,
-			    struct xfer_interface *src,
 			    struct io_buffer *iobuf );
 	/** Deliver datagram as raw data
 	 *
 	 * @v xfer		Data-transfer interface
-	 * @v src		Source interface
 	 * @v data		Data buffer
 	 * @v len		Length of data buffer
 	 * @ret rc		Return status code
@@ -42,7 +69,6 @@ struct xfer_interface_operations {
 	 * deliver_as_iobuf().
 	 */
 	int ( * deliver_raw ) ( struct xfer_interface *xfer,
-				struct xfer_interface *src,
 				const void *data, size_t len );
 };
 
@@ -57,11 +83,15 @@ struct xfer_interface {
 extern struct xfer_interface null_xfer;
 extern struct xfer_interface_operations null_xfer_ops;
 
+extern int vredirect ( struct xfer_interface *xfer, int type, va_list args );
+extern int redirect ( struct xfer_interface *xfer, int type, ... );
+extern int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf );
+extern int deliver_raw ( struct xfer_interface *xfer,
+			 const void *data, size_t len );
+
 extern int deliver_as_raw ( struct xfer_interface *xfer,
-			    struct xfer_interface *src,
 			    struct io_buffer *iobuf );
 extern int deliver_as_iobuf ( struct xfer_interface *xfer,
-			      struct xfer_interface *src,
 			      const void *data, size_t len );
 
 /**