source: bootcd/isolinux/syslinux-6.03/gpxe/src/core/open.c

/*
 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <gpxe/xfer.h>
#include <gpxe/uri.h>
#include <gpxe/socket.h>
#include <gpxe/open.h>

/** @file
 *
 * Data transfer interface opening
 *
 */

/**
 * Open URI
 *
 * @v xfer              Data transfer interface
 * @v uri               URI
 * @ret rc              Return status code
 *
 * The URI will be regarded as being relative to the current working
 * URI (see churi()).
 */
int xfer_open_uri ( struct xfer_interface *xfer, struct uri *uri ) {
        struct uri_opener *opener;
        struct uri *resolved_uri;
        int rc = -ENOTSUP;

        /* Resolve URI */
        resolved_uri = resolve_uri ( cwuri, uri );
        if ( ! resolved_uri )
                return -ENOMEM;

        /* 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;
                }
        }
        DBGC ( xfer, "XFER %p attempted to open unsupported URI scheme "
               "\"%s\"\n", xfer, resolved_uri->scheme );

 done:
        uri_put ( resolved_uri );
        return rc;
}

/**
 * Open URI string
 *
 * @v xfer              Data transfer interface
 * @v uri_string        URI string (e.g. "http://etherboot.org/kernel")
 * @ret rc              Return status code
 *
 * The URI will be regarded as being relative to the current working
 * URI (see churi()).
 */
int xfer_open_uri_string ( struct xfer_interface *xfer,
                           const char *uri_string ) {
        struct uri *uri;
        int rc;

        DBGC ( xfer, "XFER %p opening URI %s\n", xfer, uri_string );

        uri = parse_uri ( uri_string );
        if ( ! uri )
                return -ENOMEM;

        rc = xfer_open_uri ( xfer, uri );

        uri_put ( uri );
        return rc;
}

/**
 * Open socket
 *
 * @v xfer              Data transfer interface
 * @v semantics         Communication semantics (e.g. SOCK_STREAM)
 * @v peer              Peer socket address
 * @v local             Local socket address, or NULL
 * @ret rc              Return status code
 */
int xfer_open_socket ( struct xfer_interface *xfer, int semantics,
                       struct sockaddr *peer, struct sockaddr *local ) {
        struct socket_opener *opener;

        DBGC ( xfer, "XFER %p opening (%s,%s) socket\n", xfer,
               socket_semantics_name ( semantics ),
               socket_family_name ( peer->sa_family ) );

        for_each_table_entry ( opener, SOCKET_OPENERS ) {
                if ( ( opener->semantics == semantics ) &&
                     ( opener->family == peer->sa_family ) ) {
                        return opener->open ( xfer, peer, local );
                }
        }

        DBGC ( xfer, "XFER %p attempted to open unsupported socket type "
               "(%s,%s)\n", xfer, socket_semantics_name ( semantics ),
               socket_family_name ( peer->sa_family ) );
        return -ENOTSUP;
}

/**
 * Open location
 *
 * @v xfer              Data transfer interface
 * @v type              Location type
 * @v args              Remaining arguments depend upon location type
 * @ret rc              Return status code
 */
int xfer_vopen ( struct xfer_interface *xfer, int type, va_list args ) {
        switch ( type ) {
        case LOCATION_URI_STRING: {
                const char *uri_string = va_arg ( args, const char * );

                return xfer_open_uri_string ( xfer, uri_string ); }
        case LOCATION_URI: {
                struct uri *uri = va_arg ( args, struct uri * );

                return xfer_open_uri ( xfer, uri ); }
        case LOCATION_SOCKET: {
                int semantics = va_arg ( args, int );
                struct sockaddr *peer = va_arg ( args, struct sockaddr * );
                struct sockaddr *local = va_arg ( args, struct sockaddr * );

                return xfer_open_socket ( xfer, semantics, peer, local ); }
        default:
                DBGC ( xfer, "XFER %p attempted to open unsupported location "
                       "type %d\n", xfer, type );
                return -ENOTSUP;
        }
}

/**
 * Open location
 *
 * @v xfer              Data transfer interface
 * @v type              Location type
 * @v ...               Remaining arguments depend upon location type
 * @ret rc              Return status code
 */
int xfer_open ( struct xfer_interface *xfer, int type, ... ) {
        va_list args;
        int rc;

        va_start ( args, type );
        rc = xfer_vopen ( xfer, type, args );
        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 ) {

        /* Close existing connection */
        xfer_close ( xfer, 0 );

        /* Open new location */
        return xfer_vopen ( xfer, type, args );
}