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/*
* 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 );
/**
* @file
*
* iPXE scripts
*
*/
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <ipxe/image.h>
struct image_type script_image_type __image_type ( PROBE_NORMAL );
/**
* Execute script
*
* @v image Script
* @ret rc Return status code
*/
static int script_exec ( struct image *image ) {
size_t offset = 0;
off_t eol;
size_t len;
int rc;
/* Temporarily de-register image, so that a "boot" command
* doesn't throw us into an execution loop.
*/
unregister_image ( image );
while ( offset < image->len ) {
/* Find length of next line, excluding any terminating '\n' */
eol = memchr_user ( image->data, offset, '\n',
( image->len - offset ) );
if ( eol < 0 )
eol = image->len;
len = ( eol - offset );
/* Copy line, terminate with NUL, and execute command */
{
char cmdbuf[ len + 1 ];
copy_from_user ( cmdbuf, image->data, offset, len );
cmdbuf[len] = '\0';
DBG ( "$ %s\n", cmdbuf );
if ( ( rc = system ( cmdbuf ) ) != 0 ) {
DBG ( "Command \"%s\" failed: %s\n",
cmdbuf, strerror ( rc ) );
goto done;
}
}
/* Move to next line */
offset += ( len + 1 );
}
rc = 0;
done:
/* Re-register image and return */
register_image ( image );
return rc;
}
/**
* Load script into memory
*
* @v image Script
* @ret rc Return status code
*/
static int script_load ( struct image *image ) {
static const char ipxe_magic[] = "#!ipxe";
static const char gpxe_magic[] = "#!gpxe";
linker_assert ( sizeof ( ipxe_magic ) == sizeof ( gpxe_magic ),
magic_size_mismatch );
char test[ sizeof ( ipxe_magic ) - 1 /* NUL */
+ 1 /* terminating space */];
/* Sanity check */
if ( image->len < sizeof ( test ) ) {
DBG ( "Too short to be a script\n" );
return -ENOEXEC;
}
/* Check for magic signature */
copy_from_user ( test, image->data, 0, sizeof ( test ) );
if ( ! ( ( ( memcmp ( test, ipxe_magic, sizeof ( test ) - 1 ) == 0 ) ||
( memcmp ( test, gpxe_magic, sizeof ( test ) - 1 ) == 0 )) &&
isspace ( test[ sizeof ( test ) - 1 ] ) ) ) {
DBG ( "Invalid magic signature\n" );
return -ENOEXEC;
}
/* This is a script */
image->type = &script_image_type;
/* We don't actually load it anywhere; we will pick the lines
* out of the image as we need them.
*/
return 0;
}
/** Script image type */
struct image_type script_image_type __image_type ( PROBE_NORMAL ) = {
.name = "script",
.load = script_load,
.exec = script_exec,
};
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