[ipxe-devel] [PATCH] [efi] Allow iPXE's own command line to be executed as a script

Christian Nilsson nikize at gmail.com
Sun Dec 11 01:10:38 GMT 2016


cmdline part is copied over from pcbios functionallity

Signed-off-by: Christian Nilsson <nikize at gmail.com>
---
 src/config/config_efi.c         |   2 +
 src/include/ipxe/errfile.h      |   1 +
 src/interface/efi/efi_runtime.c | 177 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 180 insertions(+)
 create mode 100644 src/interface/efi/efi_runtime.c

diff --git a/src/config/config_efi.c b/src/config/config_efi.c
index 92678d1..161019a 100644
--- a/src/config/config_efi.c
+++ b/src/config/config_efi.c
@@ -49,3 +49,5 @@ REQUIRE_OBJECT ( efi_fbcon );
 #ifdef DOWNLOAD_PROTO_FILE
 REQUIRE_OBJECT ( efi_local );
 #endif
+
+REQUIRE_OBJECT ( efi_runtime );
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index d0b93d0..a8ea9d1 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -361,6 +361,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #define ERRFILE_efi_local	      ( ERRFILE_OTHER | 0x004d0000 )
 #define ERRFILE_efi_entropy	      ( ERRFILE_OTHER | 0x004e0000 )
 #define ERRFILE_cert_cmd	      ( ERRFILE_OTHER | 0x004f0000 )
+#define ERRFILE_efi_runtime	      ( ERRFILE_OTHER | 0x00500000 )
 
 /** @} */
 
diff --git a/src/interface/efi/efi_runtime.c b/src/interface/efi/efi_runtime.c
new file mode 100644
index 0000000..bc7ff82
--- /dev/null
+++ b/src/interface/efi/efi_runtime.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2011 Michael Brown <mbrown at 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** @file
+ *
+ * Command line passed to iPXE at runtime
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+#include <ipxe/init.h>
+#include <ipxe/image.h>
+#include <ipxe/script.h>
+#include <ipxe/efi/efi.h>
+
+/** Internal copy of the command line */
+static char *cmdline_copy;
+
+/** Free command line image */
+static void cmdline_image_free ( struct refcnt *refcnt ) {
+	struct image *image = container_of ( refcnt, struct image, refcnt );
+
+	DBGC ( image, "RUNTIME freeing command line\n" );
+	free ( cmdline_copy );
+}
+
+/** Embedded script representing the command line */
+static struct image cmdline_image = {
+	.refcnt = REF_INIT ( cmdline_image_free ),
+	.name = "<CMDLINE>",
+	.type = &script_image_type,
+};
+
+/** Colour for debug messages */
+#define colour &cmdline_image
+
+/**
+ * Strip unwanted cruft from command line
+ *
+ * @v cmdline		Command line
+ * @v cruft		Initial substring of cruft to strip
+ */
+static void cmdline_strip ( char *cmdline, const char *cruft ) {
+	char *strip;
+	char *strip_end;
+
+	/* Find unwanted cruft, if present */
+	if ( ! ( strip = strstr ( cmdline, cruft ) ) )
+		return;
+
+	/* Strip unwanted cruft */
+	strip_end = strchr ( strip, ' ' );
+	if ( strip_end ) {
+		*strip_end = '\0';
+		DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
+		strcpy ( strip, ( strip_end + 1 ) );
+	} else {
+		DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
+		*strip = '\0';
+	}
+}
+
+/**
+ * Initialise command line
+ *
+ * @ret rc		Return status code
+ */
+static int cmdline_init ( void ) {
+	EFI_LOADED_IMAGE_PROTOCOL *loaded = efi_loaded_image;
+	size_t cmdline_len = ( loaded->LoadOptionsSize / sizeof ( wchar_t ) );
+	char cmdline_efi[ cmdline_len + 1 /* NUL */ ];
+	const wchar_t *wcmdline = loaded->LoadOptions;
+	char *cmdline;
+	size_t len;
+	int rc;
+
+	/* Convert command line to ASCII */
+	snprintf ( cmdline_efi, sizeof ( cmdline_efi ), "%ls", wcmdline );
+
+	/* Do nothing if no command line was specified */
+	if ( ! cmdline_efi ) {
+		DBGC ( colour, "RUNTIME found no command line\n" );
+		return 0;
+	}
+	len = ( strlen ( cmdline_efi ) + 1 /* NUL */ );
+
+	/* Allocate and copy command line */
+	cmdline_copy = malloc ( len );
+	if ( ! cmdline_copy ) {
+		DBGC ( colour, "RUNTIME could not allocate %zd bytes for "
+		       "command line\n", len );
+		rc = -ENOMEM;
+		goto err_alloc_cmdline_copy;
+	}
+	cmdline = cmdline_copy;
+	strcpy ( cmdline, cmdline_efi );
+	DBGC ( colour, "RUNTIME found command line \"%s\"\n",
+	       cmdline );
+
+	/* Check for unwanted cruft in the command line */
+	while ( isspace ( *cmdline ) )
+		cmdline++;
+	/* skip program name, efi always add it first */
+	while ( ! isspace ( *cmdline ) )
+		cmdline++;
+	/* Strip unwanted cruft from the command line */
+	cmdline_strip ( cmdline, "BOOT_IMAGE=" );
+	cmdline_strip ( cmdline, "initrd=" );
+	while ( isspace ( *cmdline ) )
+		cmdline++;
+	DBGC ( colour, "RUNTIME using command line \"%s\"\n", cmdline );
+
+	/* Prepare and register image */
+	cmdline_image.data = virt_to_user ( cmdline );
+	cmdline_image.len = strlen ( cmdline );
+	if ( cmdline_image.len ) {
+		if ( ( rc = register_image ( &cmdline_image ) ) != 0 ) {
+			DBGC ( colour, "RUNTIME could not register command "
+			       "line: %s\n", strerror ( rc ) );
+			goto err_register_image;
+		}
+	}
+
+	/* Drop our reference to the image */
+	image_put ( &cmdline_image );
+
+	return 0;
+
+ err_register_image:
+	image_put ( &cmdline_image );
+ err_alloc_cmdline_copy:
+	return rc;
+}
+
+/**
+ * Initialise command line
+ *
+ */
+static void runtime_init ( void ) {
+	int rc;
+
+	/* Initialise command line */
+	if ( ( rc = cmdline_init() ) != 0 ) {
+		/* No way to report failure */
+		return;
+	}
+}
+
+/** Command line initialisation function */
+struct startup_fn efi_runtime_startup_fn __startup_fn ( STARTUP_NORMAL ) = {
+	.startup = runtime_init,
+};
-- 
2.0.5



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