tools: mkeficapsule: allow for specifying GUID explicitly

The existing options, "--fit" and "--raw," are only used to put a proper
GUID in a capsule header, where GUID identifies a particular FMP (Firmware
Management Protocol) driver which then would handle the firmware binary in
a capsule. In fact, mkeficapsule does the exact same job in creating
a capsule file whatever the firmware binary type is.

To prepare for the future extension, the command syntax will be a bit
modified to allow users to specify arbitrary GUID for their own FMP driver.
OLD:
   [--fit <image> | --raw <image>] <capsule file>
NEW:
   [--fit | --raw | --guid <guid-string>] <image> <capsule file>

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

.azure-pipelines.yml

@@ -26,7 +26,7 @@ stages:
           %CD:~0,2%\msys64\usr\bin\bash -lc "pacman --noconfirm -Su"
         displayName: 'Update MSYS2'
       - script: |
-          %CD:~0,2%\msys64\usr\bin\bash -lc "pacman --noconfirm --needed -Sy make gcc bison flex diffutils openssl-devel libgnutls-devel"
+          %CD:~0,2%\msys64\usr\bin\bash -lc "pacman --noconfirm --needed -Sy make gcc bison flex diffutils openssl-devel libgnutls-devel libutil-linux-devel"
         displayName: 'Install Toolchain'
       - script: |
           echo make tools-only_defconfig tools-only NO_SDL=1 > build-tools.sh
@@ -43,7 +43,7 @@ stages:
     pool:
       vmImage: $(macos_vm)
     steps:
-      - script: brew install make
+      - script: brew install make ossp-uuid
         displayName: Brew install dependencies
       - script: |
           gmake tools-only_config tools-only NO_SDL=1 \

doc/develop/uefi/uefi.rst

@@ -375,8 +375,8 @@ and used by the steps highlighted below.
       --private-key CRT.key \
       --certificate CRT.crt \
       --index 1 --instance 0 \
-      [--fit <FIT image> | --raw <raw image>] \
-      <capsule_file_name>
+      [--fit | --raw | --guid <guid-string] \
+      <image_blob> <capsule_file_name>
 
 4. Insert the signature list into a device tree in the following format::
 

doc/mkeficapsule.1

@@ -8,7 +8,7 @@ mkeficapsule \- Generate EFI capsule file for U-Boot
 
 .SH SYNOPSIS
 .B mkeficapsule
-.RI [ options "] " capsule-file
+.RI [ options "] " image-blob " " capsule-file
 
 .SH "DESCRIPTION"
 .B mkeficapsule
@@ -24,7 +24,7 @@ In this case, the update will be authenticated by verifying the signature
 before applying.
 
 .B mkeficapsule
-supports two different format of image files:
+takes any type of image files, including:
 .TP
 .I raw image
 format is a single binary blob of any type of firmware.
@@ -36,18 +36,30 @@ multiple binary blobs in a single capsule file.
 This type of image file can be generated by
 .BR mkimage .
 
+.PP
+If you want to use other types than above two, you should explicitly
+specify a guid for the FMP driver.
+
 .SH "OPTIONS"
 One of
-.BR --fit " or " --raw
+.BR --fit ", " --raw " or " --guid
 option must be specified.
 
 .TP
-.BI "-f\fR,\fB --fit " fit-image-file
-Specify a FIT image file
+.BR -f ", " --fit
+Indicate that the blob is a FIT image file
 
 .TP
-.BI "-r\fR,\fB --raw " raw-image-file
-Specify a raw image file
+.BR -r ", " --raw
+Indicate that the blob is a raw image file
+
+.TP
+.BI "-g\fR,\fB --guid " guid-string
+Specify guid for image blob type. The format is:
+    xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+
+The first three elements are in little endian, while the rest
+is in big endian.
 
 .TP
 .BI "-i\fR,\fB --index " index

tools/Makefile

@@ -238,7 +238,7 @@ hostprogs-$(CONFIG_MIPS) += mips-relocs
 hostprogs-$(CONFIG_ASN1_COMPILER)	+= asn1_compiler
 HOSTCFLAGS_asn1_compiler.o = -idirafter $(srctree)/include
 
-HOSTLDLIBS_mkeficapsule += -lgnutls
+HOSTLDLIBS_mkeficapsule += -lgnutls -luuid
 hostprogs-$(CONFIG_TOOLS_MKEFICAPSULE) += mkeficapsule
 
 # We build some files with extra pedantic flags to try to minimize things

tools/mkeficapsule.c

@@ -15,7 +15,7 @@
 
 #include <sys/stat.h>
 #include <sys/types.h>
-
+#include <uuid/uuid.h>
 #include <linux/kconfig.h>
 
 #include <gnutls/gnutls.h>
@@ -33,11 +33,12 @@ efi_guid_t efi_guid_image_type_uboot_raw =
 		EFI_FIRMWARE_IMAGE_TYPE_UBOOT_RAW_GUID;
 efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
 
-static const char *opts_short = "f:r:i:I:v:p:c:m:dh";
+static const char *opts_short = "frg:i:I:v:p:c:m:dh";
 
 static struct option options[] = {
-	{"fit", required_argument, NULL, 'f'},
-	{"raw", required_argument, NULL, 'r'},
+	{"fit", no_argument, NULL, 'f'},
+	{"raw", no_argument, NULL, 'r'},
+	{"guid", required_argument, NULL, 'g'},
 	{"index", required_argument, NULL, 'i'},
 	{"instance", required_argument, NULL, 'I'},
 	{"private-key", required_argument, NULL, 'p'},
@@ -50,11 +51,12 @@ static struct option options[] = {
 
 static void print_usage(void)
 {
-	printf("Usage: %s [options] <output file>\n"
+	fprintf(stderr, "Usage: %s [options] <image blob> <output file>\n"
 		"Options:\n"
 
-		"\t-f, --fit <fit image>       new FIT image file\n"
-		"\t-r, --raw <raw image>       new raw image file\n"
+		"\t-f, --fit                   FIT image type\n"
+		"\t-r, --raw                   raw image type\n"
+		"\t-g, --guid <guid string>    guid for image blob type\n"
 		"\t-i, --index <index>         update image index\n"
 		"\t-I, --instance <instance>   update hardware instance\n"
 		"\t-p, --private-key <privkey file>  private key file\n"
@@ -541,6 +543,37 @@ err:
 	return ret;
 }
 
+/**
+ * convert_uuid_to_guid() - convert UUID to GUID
+ * @buf:	UUID binary
+ *
+ * UUID and GUID have the same data structure, but their binary
+ * formats are different due to the endianness. See lib/uuid.c.
+ * Since uuid_parse() can handle only UUID, this function must
+ * be called to get correct data for GUID when parsing a string.
+ *
+ * The correct data will be returned in @buf.
+ */
+void convert_uuid_to_guid(unsigned char *buf)
+{
+	unsigned char c;
+
+	c = buf[0];
+	buf[0] = buf[3];
+	buf[3] = c;
+	c = buf[1];
+	buf[1] = buf[2];
+	buf[2] = c;
+
+	c = buf[4];
+	buf[4] = buf[5];
+	buf[5] = c;
+
+	c = buf[6];
+	buf[6] = buf[7];
+	buf[7] = c;
+}
+
 /**
  * main - main entry function of mkeficapsule
  * @argc:	Number of arguments
@@ -555,14 +588,13 @@ err:
  */
 int main(int argc, char **argv)
 {
-	char *file;
 	efi_guid_t *guid;
+	unsigned char uuid_buf[16];
 	unsigned long index, instance;
 	uint64_t mcount;
 	char *privkey_file, *cert_file;
 	int c, idx;
 
-	file = NULL;
 	guid = NULL;
 	index = 0;
 	instance = 0;
@@ -577,21 +609,34 @@ int main(int argc, char **argv)
 
 		switch (c) {
 		case 'f':
-			if (file) {
-				fprintf(stderr, "Image already specified\n");
+			if (guid) {
+				fprintf(stderr,
+					"Image type already specified\n");
 				exit(EXIT_FAILURE);
 			}
-			file = optarg;
 			guid = &efi_guid_image_type_uboot_fit;
 			break;
 		case 'r':
-			if (file) {
-				fprintf(stderr, "Image already specified\n");
+			if (guid) {
+				fprintf(stderr,
+					"Image type already specified\n");
 				exit(EXIT_FAILURE);
 			}
-			file = optarg;
 			guid = &efi_guid_image_type_uboot_raw;
 			break;
+		case 'g':
+			if (guid) {
+				fprintf(stderr,
+					"Image type already specified\n");
+				exit(EXIT_FAILURE);
+			}
+			if (uuid_parse(optarg, uuid_buf)) {
+				fprintf(stderr, "Wrong guid format\n");
+				exit(EXIT_FAILURE);
+			}
+			convert_uuid_to_guid(uuid_buf);
+			guid = (efi_guid_t *)uuid_buf;
+			break;
 		case 'i':
 			index = strtoul(optarg, NULL, 0);
 			break;
@@ -627,20 +672,14 @@ int main(int argc, char **argv)
 	}
 
 	/* check necessary parameters */
-	if ((argc != optind + 1) || !file ||
+	if ((argc != optind + 2) || !guid ||
 	    ((privkey_file && !cert_file) ||
 	     (!privkey_file && cert_file))) {
 		print_usage();
 		exit(EXIT_FAILURE);
 	}
 
-	/* need a fit image file or raw image file */
-	if (!file) {
-		print_usage();
-		exit(EXIT_SUCCESS);
-	}
-
-	if (create_fwbin(argv[optind], file, guid, index, instance,
+	if (create_fwbin(argv[argc - 1], argv[argc - 2], guid, index, instance,
 			 mcount, privkey_file, cert_file) < 0) {
 		fprintf(stderr, "Creating firmware capsule failed\n");
 		exit(EXIT_FAILURE);