4bb521a8c4
Treat a command line passed to iPXE via UEFI LoadOptions as an image to be registered at startup, as is already done for the .lkrn, .pxe, and .exe BIOS images. Originally-implemented-by: Ladi Prosek <lprosek@redhat.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
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* Copyright (C) 2023 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* EFI command line
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <ipxe/init.h>
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#include <ipxe/image.h>
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#include <ipxe/script.h>
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#include <ipxe/efi/efi.h>
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#include <ipxe/efi/efi_cmdline.h>
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/** EFI command line (may not be wNUL-terminated */
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const wchar_t *efi_cmdline;
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/** Length of EFI command line (in bytes) */
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size_t efi_cmdline_len;
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/** Internal copy of the command line */
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static char *efi_cmdline_copy;
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/**
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* Free command line image
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*
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* @v refcnt Reference count
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*/
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static void efi_cmdline_free ( struct refcnt *refcnt ) {
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struct image *image = container_of ( refcnt, struct image, refcnt );
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DBGC ( image, "CMDLINE freeing command line\n" );
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free ( efi_cmdline_copy );
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}
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/** Embedded script representing the command line */
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static struct image efi_cmdline_image = {
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.refcnt = REF_INIT ( efi_cmdline_free ),
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.name = "<CMDLINE>",
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.type = &script_image_type,
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};
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/** Colour for debug messages */
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#define colour &efi_cmdline_image
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/**
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* Initialise EFI command line
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*
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* @ret rc Return status code
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*/
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static int efi_cmdline_init ( void ) {
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char *cmdline;
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size_t len;
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int rc;
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/* Do nothing if no command line was specified */
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if ( ! efi_cmdline_len ) {
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DBGC ( colour, "CMDLINE found no command line\n" );
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return 0;
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}
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/* Allocate ASCII copy of command line */
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len = ( ( efi_cmdline_len / sizeof ( efi_cmdline[0] ) ) + 1 /* NUL */ );
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efi_cmdline_copy = malloc ( len );
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if ( ! efi_cmdline_copy ) {
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rc = -ENOMEM;
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goto err_alloc;
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}
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cmdline = efi_cmdline_copy;
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snprintf ( cmdline, len, "%ls", efi_cmdline );
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DBGC ( colour, "CMDLINE found command line \"%s\"\n", cmdline );
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/* Mark command line as consumed */
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efi_cmdline_len = 0;
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/* Strip image name and surrounding whitespace */
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while ( isspace ( *cmdline ) )
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cmdline++;
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while ( *cmdline && ( ! isspace ( *cmdline ) ) )
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cmdline++;
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while ( isspace ( *cmdline ) )
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cmdline++;
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DBGC ( colour, "CMDLINE using command line \"%s\"\n", cmdline );
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/* Prepare and register image */
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efi_cmdline_image.data = virt_to_user ( cmdline );
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efi_cmdline_image.len = strlen ( cmdline );
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if ( efi_cmdline_image.len &&
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( ( rc = register_image ( &efi_cmdline_image ) ) != 0 ) ) {
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DBGC ( colour, "CMDLINE could not register command line: %s\n",
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strerror ( rc ) );
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goto err_register_image;
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}
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/* Drop our reference to the image */
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image_put ( &efi_cmdline_image );
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return 0;
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err_register_image:
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image_put ( &efi_cmdline_image );
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err_alloc:
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return rc;
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}
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/**
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* EFI command line startup function
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*
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*/
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static void efi_cmdline_startup ( void ) {
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int rc;
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/* Initialise command line */
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if ( ( rc = efi_cmdline_init() ) != 0 ) {
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/* No way to report failure */
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return;
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}
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}
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/** Command line and initrd initialisation function */
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struct startup_fn efi_cmdline_startup_fn __startup_fn ( STARTUP_NORMAL ) = {
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.name = "efi_cmdline",
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.startup = efi_cmdline_startup,
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};
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