396 lines
9.8 KiB
C
396 lines
9.8 KiB
C
/*
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* Copyright (C) 2006 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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FILE_LICENCE ( GPL2_OR_LATER );
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/dhcp.h>
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#include <ipxe/settings.h>
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#include <ipxe/image.h>
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#include <ipxe/sanboot.h>
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#include <ipxe/uri.h>
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#include <ipxe/open.h>
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#include <ipxe/init.h>
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#include <usr/ifmgmt.h>
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#include <usr/route.h>
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#include <usr/dhcpmgmt.h>
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#include <usr/imgmgmt.h>
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#include <usr/autoboot.h>
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/** @file
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*
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* Automatic booting
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*
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*/
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/* Disambiguate the various error causes */
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#define ENOENT_BOOT __einfo_error ( EINFO_ENOENT_BOOT )
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#define EINFO_ENOENT_BOOT \
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__einfo_uniqify ( EINFO_ENOENT, 0x01, "Nothing to boot" )
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/**
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* Perform PXE menu boot when PXE stack is not available
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*/
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__weak int pxe_menu_boot ( struct net_device *netdev __unused ) {
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return -ENOTSUP;
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}
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/**
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* Identify the boot network device
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*
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* @ret netdev Boot network device
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*/
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static struct net_device * find_boot_netdev ( void ) {
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return NULL;
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}
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/**
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* Parse next-server and filename into a URI
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*
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* @v next_server Next-server address
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* @v filename Filename
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* @ret uri URI, or NULL on failure
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*/
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static struct uri * parse_next_server_and_filename ( struct in_addr next_server,
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const char *filename ) {
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char buf[ 23 /* "tftp://xxx.xxx.xxx.xxx/" */ + strlen ( filename )
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+ 1 /* NUL */ ];
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struct uri *uri;
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/* Parse filename */
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uri = parse_uri ( filename );
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if ( ! uri )
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return NULL;
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/* Construct a tftp:// URI for the filename, if applicable.
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* We can't just rely on the current working URI, because the
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* relative URI resolution will remove the distinction between
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* filenames with and without initial slashes, which is
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* significant for TFTP.
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*/
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if ( next_server.s_addr && filename[0] && ! uri_is_absolute ( uri ) ) {
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uri_put ( uri );
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snprintf ( buf, sizeof ( buf ), "tftp://%s/%s",
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inet_ntoa ( next_server ), filename );
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uri = parse_uri ( buf );
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if ( ! uri )
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return NULL;
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}
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return uri;
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}
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/** The "keep-san" setting */
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struct setting keep_san_setting __setting = {
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.name = "keep-san",
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.description = "Preserve SAN connection",
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.tag = DHCP_EB_KEEP_SAN,
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.type = &setting_type_int8,
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};
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/** The "skip-san-boot" setting */
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struct setting skip_san_boot_setting __setting = {
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.name = "skip-san-boot",
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.description = "Do not boot the SAN drive after connecting",
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.tag = DHCP_EB_SKIP_SAN_BOOT,
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.type = &setting_type_int8,
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};
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/**
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* Boot from filename and root-path URIs
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*
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* @v filename Filename
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* @v root_path Root path
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* @ret rc Return status code
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*/
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int uriboot ( struct uri *filename, struct uri *root_path ) {
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struct image *image;
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int drive;
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int rc;
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/* Allocate image */
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image = alloc_image();
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if ( ! image ) {
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printf ( "Could not allocate image\n" );
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rc = -ENOMEM;
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goto err_alloc_image;
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}
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/* Treat empty URIs as absent */
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if ( filename && ( ! uri_has_path ( filename ) ) )
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filename = NULL;
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if ( root_path && ( ! uri_is_absolute ( root_path ) ) )
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root_path = NULL;
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/* If we have both a filename and a root path, ignore an
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* unsupported URI scheme in the root path, since it may
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* represent an NFS root.
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*/
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if ( filename && root_path &&
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( xfer_uri_opener ( root_path->scheme ) == NULL ) ) {
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printf ( "Ignoring unsupported root path\n" );
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root_path = NULL;
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}
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/* Hook SAN device, if applicable */
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if ( root_path ) {
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drive = san_hook ( root_path, 0 );
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if ( drive < 0 ) {
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rc = drive;
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printf ( "Could not open SAN device: %s\n",
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strerror ( rc ) );
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goto err_san_hook;
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}
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printf ( "Registered as SAN device %#02x\n", drive );
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} else {
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drive = -ENODEV;
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}
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/* Describe SAN device, if applicable */
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if ( ( drive >= 0 ) && ( ( rc = san_describe ( drive ) ) != 0 ) ) {
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printf ( "Could not describe SAN device %#02x: %s\n",
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drive, strerror ( rc ) );
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goto err_san_describe;
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}
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/* Attempt filename or SAN boot as applicable */
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if ( filename ) {
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if ( ( rc = imgdownload ( image, filename,
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register_and_autoexec_image ) ) !=0){
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printf ( "Could not chain image: %s\n",
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strerror ( rc ) );
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}
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} else if ( root_path ) {
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if ( fetch_intz_setting ( NULL, &skip_san_boot_setting) == 0 ) {
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printf ( "Booting from SAN device %#02x\n", drive );
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rc = san_boot ( drive );
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printf ( "Boot from SAN device %#02x failed: %s\n",
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drive, strerror ( rc ) );
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} else {
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printf ( "Skipping boot from SAN device %#02x\n",
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drive );
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rc = 0;
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}
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} else {
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rc = -ENOENT_BOOT;
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printf ( "Nothing to boot: %s\n", strerror ( rc ) );
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}
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err_san_describe:
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/* Unhook SAN device, if applicable */
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if ( drive >= 0 ) {
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if ( fetch_intz_setting ( NULL, &keep_san_setting ) == 0 ) {
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printf ( "Unregistering SAN device %#02x\n", drive );
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san_unhook ( drive );
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} else {
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printf ( "Preserving connection to SAN device %#02x\n",
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drive );
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}
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}
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err_san_hook:
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image_put ( image );
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err_alloc_image:
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return rc;
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}
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/**
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* Close all open net devices
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*
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* Called before a fresh boot attempt in order to free up memory. We
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* don't just close the device immediately after the boot fails,
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* because there may still be TCP connections in the process of
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* closing.
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*/
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static void close_all_netdevs ( void ) {
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struct net_device *netdev;
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for_each_netdev ( netdev ) {
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ifclose ( netdev );
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}
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}
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/**
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* Fetch next-server and filename settings into a URI
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*
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* @v settings Settings block
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* @ret uri URI, or NULL on failure
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*/
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struct uri * fetch_next_server_and_filename ( struct settings *settings ) {
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struct in_addr next_server;
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char buf[256];
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char *filename;
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struct uri *uri;
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/* Fetch next-server setting */
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fetch_ipv4_setting ( settings, &next_server_setting, &next_server );
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if ( next_server.s_addr )
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printf ( "Next server: %s\n", inet_ntoa ( next_server ) );
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/* Fetch filename setting */
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fetch_string_setting ( settings, &filename_setting,
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buf, sizeof ( buf ) );
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if ( buf[0] )
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printf ( "Filename: %s\n", buf );
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/* Expand filename setting */
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filename = expand_settings ( buf );
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if ( ! filename )
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return NULL;
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/* Parse next server and filename */
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uri = parse_next_server_and_filename ( next_server, filename );
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free ( filename );
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return uri;
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}
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/**
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* Fetch root-path setting into a URI
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*
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* @v settings Settings block
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* @ret uri URI, or NULL on failure
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*/
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static struct uri * fetch_root_path ( struct settings *settings ) {
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char buf[256];
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char *root_path;
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struct uri *uri;
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/* Fetch root-path setting */
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fetch_string_setting ( settings, &root_path_setting,
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buf, sizeof ( buf ) );
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if ( buf[0] )
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printf ( "Root path: %s\n", buf );
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/* Expand filename setting */
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root_path = expand_settings ( buf );
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if ( ! root_path )
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return NULL;
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/* Parse root path */
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uri = parse_uri ( root_path );
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free ( root_path );
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return uri;
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}
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/**
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* Check whether or not we have a usable PXE menu
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*
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* @ret have_menu A usable PXE menu is present
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*/
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static int have_pxe_menu ( void ) {
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struct setting vendor_class_id_setting
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= { .tag = DHCP_VENDOR_CLASS_ID };
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struct setting pxe_discovery_control_setting
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= { .tag = DHCP_PXE_DISCOVERY_CONTROL };
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struct setting pxe_boot_menu_setting
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= { .tag = DHCP_PXE_BOOT_MENU };
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char buf[256];
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unsigned int pxe_discovery_control;
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fetch_string_setting ( NULL, &vendor_class_id_setting,
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buf, sizeof ( buf ) );
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pxe_discovery_control =
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fetch_uintz_setting ( NULL, &pxe_discovery_control_setting );
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return ( ( strcmp ( buf, "PXEClient" ) == 0 ) &&
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setting_exists ( NULL, &pxe_boot_menu_setting ) &&
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( ! ( ( pxe_discovery_control & PXEBS_SKIP ) &&
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setting_exists ( NULL, &filename_setting ) ) ) );
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}
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/**
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* Boot from a network device
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*
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* @v netdev Network device
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* @ret rc Return status code
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*/
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int netboot ( struct net_device *netdev ) {
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struct uri *filename;
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struct uri *root_path;
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int rc;
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/* Close all other network devices */
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close_all_netdevs();
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/* Open device and display device status */
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if ( ( rc = ifopen ( netdev ) ) != 0 )
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goto err_ifopen;
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ifstat ( netdev );
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/* Configure device via DHCP */
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if ( ( rc = dhcp ( netdev ) ) != 0 )
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goto err_dhcp;
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route();
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/* Try PXE menu boot, if applicable */
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if ( have_pxe_menu() ) {
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printf ( "Booting from PXE menu\n" );
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rc = pxe_menu_boot ( netdev );
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goto err_pxe_menu_boot;
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}
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/* Fetch next server, filename and root path */
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filename = fetch_next_server_and_filename ( NULL );
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if ( ! filename )
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goto err_filename;
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root_path = fetch_root_path ( NULL );
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if ( ! root_path )
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goto err_root_path;
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/* Boot using next server, filename and root path */
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if ( ( rc = uriboot ( filename, root_path ) ) != 0 )
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goto err_uriboot;
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err_uriboot:
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uri_put ( root_path );
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err_root_path:
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uri_put ( filename );
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err_filename:
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err_pxe_menu_boot:
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err_dhcp:
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err_ifopen:
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return rc;
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}
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/**
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* Boot the system
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*/
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int autoboot ( void ) {
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struct net_device *boot_netdev;
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struct net_device *netdev;
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int rc = -ENODEV;
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/* If we have an identifable boot device, try that first */
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if ( ( boot_netdev = find_boot_netdev() ) )
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rc = netboot ( boot_netdev );
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/* If that fails, try booting from any of the other devices */
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for_each_netdev ( netdev ) {
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if ( netdev == boot_netdev )
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continue;
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rc = netboot ( netdev );
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}
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printf ( "No more network devices\n" );
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return rc;
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}
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