[PATCH 2/4] uefi: uefidump: add dumping for DNS device path

[Ivan Hu]

DNS device path was added on UEFI spec version 2.7

Signed-off-by: Ivan Hu <ivan.hu at canonical.com>
---
 src/lib/include/fwts_uefi.h  |  9 ++++++++-
 src/uefi/uefidump/uefidump.c | 13 +++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/lib/include/fwts_uefi.h b/src/lib/include/fwts_uefi.h
index db83f2f..0821069 100644
--- a/src/lib/include/fwts_uefi.h
+++ b/src/lib/include/fwts_uefi.h
@@ -254,7 +254,8 @@ typedef enum {
 	FWTS_UEFI_BLUETOOTH_DEVICE_PATH_SUBTYPE = 	(0x1b),
 	FWTS_UEFI_WIRELESS_DEVICE_PATH_SUBTYPE = 	(0x1c),
 	FWTS_UEFI_EMMC_DEVICE_PATH_SUBTYPE =		(0x1d),
-	FWTS_UEFI_BLUETOOTHLE_DEVICE_PATH_SUBTYPE =	(0x1e)
+	FWTS_UEFI_BLUETOOTHLE_DEVICE_PATH_SUBTYPE =	(0x1e),
+	FWTS_UEFI_DNS_DEVICE_PATH_SUBTYPE =		(0x1f)
 } messaging_dev_path_subtypes;
 
 typedef enum {
@@ -565,6 +566,12 @@ typedef struct {
 
 typedef struct {
 	fwts_uefi_dev_path dev_path;
+	uint8_t isipv6;
+	uint8_t dns_addr[0];
+} __attribute__((packed)) fwts_uefi_dns_dev_path;
+
+typedef struct {
+	fwts_uefi_dev_path dev_path;
 	uint32_t partition_number;
 	uint64_t partition_start;
 	uint64_t partition_size;
diff --git a/src/uefi/uefidump/uefidump.c b/src/uefi/uefidump/uefidump.c
index af20f85..f73ed6e 100644
--- a/src/uefi/uefidump/uefidump.c
+++ b/src/uefi/uefidump/uefidump.c
@@ -549,6 +549,19 @@ static char *uefidump_build_dev_path(char *path, fwts_uefi_dev_path *dev_path, c
 					b->bluetooth_addr[3], b->bluetooth_addr[4], b->bluetooth_addr[5], b->addr_type);
 			}
 			break;
+		case FWTS_UEFI_DNS_DEVICE_PATH_SUBTYPE:
+			if (dev_path_len > sizeof(fwts_uefi_dns_dev_path)) {
+				size_t i;
+				fwts_uefi_dns_dev_path *d = (fwts_uefi_dns_dev_path *)dev_path;
+				uint16_t len = d->dev_path.length[0] | (((uint16_t)d->dev_path.length[1]) << 8);
+				path = uefidump_vprintf(path, "\\DNS(0x%" PRIx8 ",", d->isipv6);
+
+				/* dump one or more DNS server address */
+				for (i = 0; i < (len - sizeof(fwts_uefi_dns_dev_path)); i++)
+					path = uefidump_vprintf(path, "%02" PRIx8 , d->dns_addr[i]);
+				path = uefidump_vprintf(path, ")");
+			}
+			break;
 		default:
 			path = uefidump_vprintf(path, "\\Unknown-MESSAGING-DEV-PATH(0x%" PRIx8 ")", dev_path->subtype);
 			break;
-- 
2.7.4