132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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* Copyright (C) 2007 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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/**
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* @file
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*
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* iPXE scripts
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*
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*/
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#include <string.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/image.h>
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struct image_type script_image_type __image_type ( PROBE_NORMAL );
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/**
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* Execute script
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*
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* @v image Script
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* @ret rc Return status code
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*/
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static int script_exec ( struct image *image ) {
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size_t offset = 0;
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off_t eol;
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size_t len;
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int rc;
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/* Temporarily de-register image, so that a "boot" command
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* doesn't throw us into an execution loop.
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*/
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unregister_image ( image );
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while ( offset < image->len ) {
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/* Find length of next line, excluding any terminating '\n' */
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eol = memchr_user ( image->data, offset, '\n',
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( image->len - offset ) );
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if ( eol < 0 )
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eol = image->len;
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len = ( eol - offset );
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/* Copy line, terminate with NUL, and execute command */
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{
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char cmdbuf[ len + 1 ];
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copy_from_user ( cmdbuf, image->data, offset, len );
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cmdbuf[len] = '\0';
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DBG ( "$ %s\n", cmdbuf );
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if ( ( rc = system ( cmdbuf ) ) != 0 ) {
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DBG ( "Command \"%s\" failed: %s\n",
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cmdbuf, strerror ( rc ) );
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goto done;
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}
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}
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/* Move to next line */
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offset += ( len + 1 );
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}
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rc = 0;
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done:
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/* Re-register image and return */
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register_image ( image );
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return rc;
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}
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/**
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* Load script into memory
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*
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* @v image Script
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* @ret rc Return status code
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*/
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static int script_load ( struct image *image ) {
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static const char ipxe_magic[] = "#!ipxe";
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static const char gpxe_magic[] = "#!gpxe";
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linker_assert ( sizeof ( ipxe_magic ) == sizeof ( gpxe_magic ),
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magic_size_mismatch );
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char test[ sizeof ( ipxe_magic ) - 1 /* NUL */
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+ 1 /* terminating space */];
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/* Sanity check */
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if ( image->len < sizeof ( test ) ) {
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DBG ( "Too short to be a script\n" );
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return -ENOEXEC;
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}
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/* Check for magic signature */
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copy_from_user ( test, image->data, 0, sizeof ( test ) );
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if ( ! ( ( ( memcmp ( test, ipxe_magic, sizeof ( test ) - 1 ) == 0 ) ||
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( memcmp ( test, gpxe_magic, sizeof ( test ) - 1 ) == 0 )) &&
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isspace ( test[ sizeof ( test ) - 1 ] ) ) ) {
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DBG ( "Invalid magic signature\n" );
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return -ENOEXEC;
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}
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/* This is a script */
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image->type = &script_image_type;
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/* We don't actually load it anywhere; we will pick the lines
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* out of the image as we need them.
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*/
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return 0;
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}
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/** Script image type */
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struct image_type script_image_type __image_type ( PROBE_NORMAL ) = {
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.name = "script",
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.load = script_load,
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.exec = script_exec,
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};
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