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Preliminary support for opening data-transfer interfaces
This commit is contained in:
Michael Brown
parent
27b3bd10c9
commit
ff1222a8d3
144
src/core/open.c
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144
src/core/open.c
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@ -0,0 +1,144 @@
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/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <gpxe/xfer.h>
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#include <gpxe/uri.h>
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#include <gpxe/socket.h>
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#include <gpxe/open.h>
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/** @file
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*
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* Data transfer interface opening
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*
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*/
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/** Registered URI openers */
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static struct uri_opener uri_openers[0]
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__table_start ( struct uri_opener, uri_openers );
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static struct uri_opener uri_openers_end[0]
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__table_end ( struct uri_opener, uri_openers );
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/** Registered socket openers */
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static struct socket_opener socket_openers[0]
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__table_start ( struct socket_opener, socket_openers );
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static struct socket_opener socket_openers_end[0]
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__table_end ( struct socket_opener, socket_openers );
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/**
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* Open URI
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*
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* @v xfer Data-transfer interface
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* @v uri_string URI string (e.g. "http://etherboot.org/kernel")
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* @ret rc Return status code
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*/
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int open_uri ( struct xfer_interface *xfer, const char *uri_string ) {
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struct uri *uri;
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struct uri_opener *opener;
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DBGC ( xfer, "XFER %p opening URI %s\n", xfer, uri_string );
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uri = parse_uri ( uri_string );
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if ( ! uri )
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return -ENOMEM;
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for ( opener = uri_openers ; opener < uri_openers_end ; opener++ ) {
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if ( strcmp ( uri->scheme, opener->scheme ) == 0 ) {
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return opener->open ( xfer, uri );
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}
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}
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DBGC ( xfer, "XFER %p attempted to open unsupported URI scheme "
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"\"%s\"\n", xfer, uri->scheme );
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free_uri ( uri );
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return -ENOTSUP;
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}
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/**
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* Open socket
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*
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* @v xfer Data-transfer interface
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* @v domain Communication domain (e.g. PF_INET)
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* @v type Communication semantics (e.g. SOCK_STREAM)
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*/
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int open_socket ( struct xfer_interface *xfer,
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int domain, int type, struct sockaddr *sa ) {
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struct socket_opener *opener;
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DBGC ( xfer, "XFER %p opening (%s,%s) socket\n", xfer,
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socket_domain_name ( domain ), socket_type_name ( type ) );
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for ( opener = socket_openers; opener < socket_openers_end; opener++ ){
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if ( ( opener->domain == domain ) &&
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( opener->type == type ) ) {
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return opener->open ( xfer, sa );
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}
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}
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DBGC ( xfer, "XFER %p attempted to open unsupported socket type "
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"(%s,%s)\n", xfer, socket_domain_name ( domain ),
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socket_type_name ( type ) );
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return -ENOTSUP;
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}
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/**
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* Open location
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*
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* @v xfer Data-transfer interface
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* @v type Location type
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* @v args Remaining arguments depend upon location type
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* @ret rc Return status code
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*/
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int vopen ( struct xfer_interface *xfer, int type, va_list args ) {
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switch ( type ) {
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case LOCATION_URI: {
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const char *uri_string = va_arg ( args, const char * );
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return open_uri ( xfer, uri_string ); }
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case LOCATION_SOCKET: {
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int domain = va_arg ( args, int );
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int type = va_arg ( args, int );
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struct sockaddr *sa = va_arg ( args, struct sockaddr * );
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return open_socket ( xfer, domain, type, sa ); }
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default:
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DBGC ( xfer, "XFER %p attempted to open unsupported location "
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"type %d\n", xfer, type );
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return -ENOTSUP;
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}
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}
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/**
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* Open location
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*
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* @v xfer Data-transfer interface
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* @v type Location type
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* @v ... Remaining arguments depend upon location type
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* @ret rc Return status code
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*/
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int open ( struct xfer_interface *xfer, int type, ... ) {
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va_list args;
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int rc;
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va_start ( args, type );
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rc = vopen ( xfer, type, args );
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va_end ( args );
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return rc;
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}
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@ -26,6 +26,38 @@
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*
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*/
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/**
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* Send redirection event
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*
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* @v xfer Data-transfer interface
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* @v type New location type
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* @v args Remaining arguments depend upon location type
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* @ret rc Return status code
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*/
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int vredirect ( struct xfer_interface *xfer, int type, va_list args ) {
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struct xfer_interface *dest = xfer_dest ( xfer );
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return dest->op->vredirect ( dest, type, args );
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}
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/**
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* Send redirection event
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*
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* @v xfer Data-transfer interface
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* @v type New location type
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* @v ... Remaining arguments depend upon location type
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* @ret rc Return status code
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*/
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int redirect ( struct xfer_interface *xfer, int type, ... ) {
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va_list args;
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int rc;
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va_start ( args, type );
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rc = vredirect ( xfer, type, args );
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va_end ( args );
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return rc;
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}
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/**
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* Deliver datagram
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*
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@ -36,14 +68,35 @@
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int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
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struct xfer_interface *dest = xfer_dest ( xfer );
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return dest->op->deliver ( dest, xfer, iobuf );
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return dest->op->deliver ( dest, iobuf );
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}
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/**
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* Deliver datagram as raw data
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*
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* @v xfer Data-transfer interface
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* @v src Source interface
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* @v iobuf Datagram I/O buffer
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* @ret rc Return status code
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*/
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int deliver_raw ( struct xfer_interface *xfer, const void *data, size_t len ) {
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struct xfer_interface *dest = xfer_dest ( xfer );
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return dest->op->deliver_raw ( dest, data, len );
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}
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/****************************************************************************
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*
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* Helper methods
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*
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* These functions are designed to be used as methods in the
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* xfer_interface_operations table.
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*
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*/
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/**
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* Deliver datagram as raw data
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*
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* @v xfer Data-transfer interface
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* @v iobuf Datagram I/O buffer
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* @ret rc Return status code
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*
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@ -51,12 +104,10 @@ int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
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* data transfer interfaces that prefer to handle raw data.
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*/
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int deliver_as_raw ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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struct io_buffer *iobuf ) {
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int rc;
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rc = xfer->op->deliver_raw ( xfer, src, iobuf->data,
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iob_len ( iobuf ) );
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rc = xfer->op->deliver_raw ( xfer, iobuf->data, iob_len ( iobuf ) );
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free_iob ( iobuf );
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return rc;
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}
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@ -65,7 +116,6 @@ int deliver_as_raw ( struct xfer_interface *xfer,
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* Deliver datagram as I/O buffer
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*
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* @v xfer Data-transfer interface
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* @v src Source interface
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* @v data Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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@ -74,32 +124,34 @@ int deliver_as_raw ( struct xfer_interface *xfer,
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* for data transfer interfaces that prefer to handle I/O buffers.
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*/
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int deliver_as_iobuf ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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const void *data, size_t len ) {
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struct io_buffer *iobuf;
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#warning "Do we need interface-specific I/O buffer allocation?"
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iobuf = alloc_iob ( len );
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if ( ! iobuf )
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return -ENOMEM;
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memcpy ( iob_put ( iobuf, len ), data, len );
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return xfer->op->deliver ( xfer, src, iobuf );
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return xfer->op->deliver ( xfer, iobuf );
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}
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/****************************************************************************
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*
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* Null data transfer interface
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*
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*/
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/**
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* Null deliver datagram as raw data
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*
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* @v xfer Data-transfer interface
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* @v src Source interface
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* @v data Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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*/
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static int null_deliver_raw ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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const void *data __unused, size_t len ) {
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DBGC ( src, "XFER %p->%p %zd bytes delivered %s\n", src, xfer, len,
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DBGC ( xfer, "XFER %p %zd bytes delivered %s\n", xfer, len,
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( ( xfer == &null_xfer ) ?
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"before connection" : "after termination" ) );
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return -EPIPE;
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81
src/include/gpxe/open.h
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81
src/include/gpxe/open.h
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@ -0,0 +1,81 @@
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#ifndef _GPXE_OPEN_H
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#define _GPXE_OPEN_H
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/** @file
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*
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* Data transfer interface opening
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*
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*/
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#include <gpxe/tables.h>
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struct xfer_interface;
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struct uri;
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struct sockaddr;
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/** Location types */
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enum {
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/** Location is a URI string
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*
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* Parameter list for open() is:
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*
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* const char *uri_string;
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*/
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LOCATION_URI = 1,
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/** Location is a socket
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*
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* Parameter list for open() is:
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*
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*
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*/
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LOCATION_SOCKET,
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};
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/** A URI opener */
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struct uri_opener {
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/** URI protocol name
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*
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* This is the "scheme" portion of the URI, e.g. "http" or
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* "file".
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*/
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const char *scheme;
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/** Open URI
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*
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* @v xfer Data-transfer interface
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* @v uri URI
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* @ret rc Return status code
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*
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* This method takes ownership of the URI structure, and is
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* responsible for eventually calling free_uri().
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*/
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int ( * open ) ( struct xfer_interface *xfer, struct uri *uri );
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};
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/** Register a URI opener */
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#define __uri_opener __table ( struct uri_opener, uri_openers, 01 )
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/** A socket opener */
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struct socket_opener {
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/** Communication domain (e.g. PF_INET) */
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int domain;
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/** Communication semantics (e.g. SOCK_STREAM) */
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int type;
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/** Open socket
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*
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* @v xfer Data-transfer interface
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* @v sa Socket address
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* @ret rc Return status code
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*/
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int ( * open ) ( struct xfer_interface *xfer, struct sockaddr *sa );
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};
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/** Register a socket opener */
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#define __socket_opener __table ( struct socket_opener, socket_openers, 01 )
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extern int open_uri ( struct xfer_interface *xfer, const char *uri_string );
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extern int open_socket ( struct xfer_interface *xfer,
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int domain, int type, struct sockaddr *sa );
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extern int vopen ( struct xfer_interface *xfer, int type, va_list args );
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extern int open ( struct xfer_interface *xfer, int type, ... );
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#endif /* _GPXE_OPEN_H */
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@ -8,6 +8,7 @@
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*/
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#include <stddef.h>
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#include <stdarg.h>
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#include <gpxe/interface.h>
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#include <gpxe/iobuf.h>
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@ -15,10 +16,38 @@ struct xfer_interface;
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/** Data transfer interface operations */
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struct xfer_interface_operations {
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/* Missing features:
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*
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* notification of non-close status - e.g. connected/opened, ...
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*
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* seek
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*
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* prompt for data delivery
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*
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* I/O buffer preparation
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*
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*/
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/** Close interface
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*
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* @v xfer Data-transfer interface
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* @v rc Reason for close
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*/
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void ( * close ) ( struct xfer_interface *xfer, int rc );
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/** Redirect to new location
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*
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* @v xfer Data-transfer interface
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* @v type New location type
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* @v args Remaining arguments depend upon location type
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* @ret rc Return status code
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*/
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int ( * vredirect ) ( struct xfer_interface *xfer, int type,
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va_list args );
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/** Deliver datagram
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*
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* @v xfer Data-transfer interface
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* @v src Source interface
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* @v iobuf Datagram I/O buffer
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* @ret rc Return status code
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*
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@ -27,12 +56,10 @@ struct xfer_interface_operations {
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* deliver_as_raw().
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*/
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int ( * deliver ) ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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struct io_buffer *iobuf );
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/** Deliver datagram as raw data
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*
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* @v xfer Data-transfer interface
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* @v src Source interface
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* @v data Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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@ -42,7 +69,6 @@ struct xfer_interface_operations {
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* deliver_as_iobuf().
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*/
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int ( * deliver_raw ) ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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const void *data, size_t len );
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};
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@ -57,11 +83,15 @@ struct xfer_interface {
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extern struct xfer_interface null_xfer;
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extern struct xfer_interface_operations null_xfer_ops;
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extern int vredirect ( struct xfer_interface *xfer, int type, va_list args );
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extern int redirect ( struct xfer_interface *xfer, int type, ... );
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extern int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf );
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extern int deliver_raw ( struct xfer_interface *xfer,
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const void *data, size_t len );
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extern int deliver_as_raw ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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struct io_buffer *iobuf );
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extern int deliver_as_iobuf ( struct xfer_interface *xfer,
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struct xfer_interface *src,
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const void *data, size_t len );
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/**
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