[xfer] Implement xfer_vreopen() to properly handle redirections

When handling a redirection event, we need to close the existing
connection before opening the new connection.

src/arch/i386/interface/pxe/pxe_tftp.c

 
 static struct xfer_interface_operations pxe_tftp_xfer_ops = {
 	.close		= pxe_tftp_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= pxe_tftp_xfer_deliver_iob,

src/core/downloader.c

 /** Downloader data transfer interface operations */
 static struct xfer_interface_operations downloader_xfer_operations = {
 	.close		= downloader_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= downloader_xfer_deliver_iob,

src/core/open.c

 	/* Find opener which supports this URI scheme */
 	for_each_table_entry ( opener, URI_OPENERS ) {
 		if ( strcmp ( resolved_uri->scheme, opener->scheme ) == 0 ) {
+			DBGC ( xfer, "XFER %p opening %s URI\n",
+			       xfer, opener->scheme );
 			rc = opener->open ( xfer, resolved_uri );
 			goto done;
 		}
 	va_end ( args );
 	return rc;
 }
+
+/**
+ * Reopen location
+ *
+ * @v xfer		Data transfer interface
+ * @v type		Location type
+ * @v args		Remaining arguments depend upon location type
+ * @ret rc		Return status code
+ *
+ * This will close the existing connection and open a new connection
+ * using xfer_vopen().  It is intended to be used as a .vredirect
+ * method handler.
+ */
+int xfer_vreopen ( struct xfer_interface *xfer, int type, va_list args ) {
+	struct xfer_interface_operations *op = xfer->op;
+
+	/* Close existing connection */
+	xfer_nullify ( xfer );
+	xfer_close ( xfer, 0 );
+
+	/* Restore to operational status */
+	xfer->op = op;
+
+	/* Open new location */
+	return xfer_vopen ( xfer, type, args );
+}

src/core/posix_io.c

 /** POSIX file data transfer interface operations */
 static struct xfer_interface_operations posix_file_xfer_operations = {
 	.close		= posix_file_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= posix_file_xfer_deliver_iob,

src/include/gpxe/open.h

 			      struct sockaddr *peer, struct sockaddr *local );
 extern int xfer_vopen ( struct xfer_interface *xfer, int type, va_list args );
 extern int xfer_open ( struct xfer_interface *xfer, int type, ... );
+extern int xfer_vreopen ( struct xfer_interface *xfer, int type,
+			  va_list args );
 
 #endif /* _GPXE_OPEN_H */

src/net/tcp/ftp.c

 /** FTP control channel operations */
 static struct xfer_interface_operations ftp_control_operations = {
 	.close		= ftp_control_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,
 /** FTP data channel operations */
 static struct xfer_interface_operations ftp_data_operations = {
 	.close		= ftp_data_closed,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= ftp_data_deliver_iob,

src/net/tcp/http.c

 /** HTTP socket operations */
 static struct xfer_interface_operations http_socket_operations = {
 	.close		= http_socket_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= http_socket_deliver_iob,

src/net/tcp/iscsi.c

 		va_end ( tmp );
 	}
 
-	return xfer_vopen ( socket, type, args );
+	return xfer_vreopen ( socket, type, args );
 }
 			     
 

src/net/tls.c

 /** TLS ciphertext stream operations */
 static struct xfer_interface_operations tls_cipherstream_operations = {
 	.close		= tls_cipherstream_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= filter_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/net/udp/dhcp.c

 /** DHCP data transfer interface operations */
 static struct xfer_interface_operations dhcp_xfer_operations = {
 	.close		= ignore_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= dhcp_deliver_iob,

src/net/udp/dns.c

 /** DNS socket operations */
 static struct xfer_interface_operations dns_socket_operations = {
 	.close		= dns_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= xfer_deliver_as_raw,

src/net/udp/slam.c

 /** SLAM unicast socket data transfer operations */
 static struct xfer_interface_operations slam_socket_operations = {
 	.close		= slam_socket_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= slam_socket_deliver,
 /** SLAM multicast socket data transfer operations */
 static struct xfer_interface_operations slam_mc_socket_operations = {
 	.close		= slam_mc_socket_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= slam_mc_socket_deliver,

src/net/udp/tftp.c

 /** TFTP socket operations */
 static struct xfer_interface_operations tftp_socket_operations = {
 	.close		= ignore_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= tftp_socket_deliver_iob,
 /** TFTP multicast socket operations */
 static struct xfer_interface_operations tftp_mc_socket_operations = {
 	.close		= ignore_xfer_close,
-	.vredirect	= xfer_vopen,
+	.vredirect	= xfer_vreopen,
 	.window		= unlimited_xfer_window,
 	.alloc_iob	= default_xfer_alloc_iob,
 	.deliver_iob	= tftp_mc_socket_deliver_iob,