1 files changed, 128 insertions, 0 deletions
diff --git a/gpxe/src/image/script.c b/gpxe/src/image/script.c
new file mode 100644
index 00000000..a24bc09a
--- /dev/null
+++ b/gpxe/src/image/script.c
@@ -0,0 +1,128 @@
+/*
+ * 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 %zd 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,
+};