mirror of https://github.com/ipxe/ipxe.git
129 lines
3.1 KiB
C
129 lines
3.1 KiB
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
|
|
*
|
|
* gPXE scripts
|
|
*
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <gpxe/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 ) {
|
|
char cmdbuf[256];
|
|
size_t offset = 0;
|
|
size_t remaining;
|
|
size_t len;
|
|
char *eol;
|
|
int rc;
|
|
|
|
/* Temporarily de-register image, so that a "boot" command
|
|
* doesn't throw us into an execution loop. Hold a reference
|
|
* to avoid the image's being freed.
|
|
*/
|
|
image_get ( image );
|
|
unregister_image ( image );
|
|
|
|
while ( offset < image->len ) {
|
|
|
|
/* Read up to cmdbuf bytes from script into buffer */
|
|
remaining = ( image->len - offset );
|
|
len = sizeof ( cmdbuf );
|
|
if ( len > remaining )
|
|
len = remaining;
|
|
memset ( cmdbuf, 0, sizeof ( cmdbuf ) );
|
|
copy_from_user ( cmdbuf, image->data, offset, len );
|
|
|
|
/* Find end of line */
|
|
eol = memchr ( cmdbuf, '\n', sizeof ( cmdbuf ) );
|
|
if ( ! eol )
|
|
eol = memchr ( cmdbuf, '\0', sizeof ( cmdbuf ) );
|
|
if ( ! eol ) {
|
|
DBG ( "Script line too long (max %d bytes)\n",
|
|
sizeof ( cmdbuf ) );
|
|
rc = -ENOEXEC;
|
|
goto done;
|
|
}
|
|
|
|
/* Mark end of line and execute command */
|
|
*eol = '\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 += ( ( eol - cmdbuf ) + 1 );
|
|
}
|
|
|
|
rc = 0;
|
|
done:
|
|
/* Re-register image and return */
|
|
register_image ( image );
|
|
image_put ( 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 magic[] = "#!gpxe\n";
|
|
char test[ sizeof ( magic ) - 1 ];
|
|
|
|
/* Check for magic signature */
|
|
copy_from_user ( test, image->data, 0, sizeof ( test ) );
|
|
if ( memcmp ( test, magic, sizeof ( test ) ) != 0 ) {
|
|
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,
|
|
};
|