1 files changed, 126 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/image/script.c b/contrib/syslinux-4.02/gpxe/src/image/script.c
new file mode 100644
index 0000000..0835ecb
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/image/script.c
@@ -0,0 +1,126 @@
+/*
+ * 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
+ *
+ * gPXE scripts
+ *
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.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 ) {
+	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 magic[] = "#!gpxe";
+	char test[ sizeof ( 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, 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,
+};