From 146f94df39372490756ca7014e9c02a99cb08ac9 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Mon, 28 Jan 2019 11:53:58 +0100
Subject: Add NK_get_status function to get status struct

Currently, the C API provides access to the device status using the
NK_get_{major,minor}_firmware_version, NK_device_serial_number and
NK_read_config functions.  Each function sends a command to the device,
although the data is returned in a single response.  This patch adds a
NK_status struct and a NK_get_status function that provide access to
this data with a single command.
---
 NK_C_API.cc | 24 ++++++++++++++++++++++++
 NK_C_API.h  | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)

diff --git a/NK_C_API.cc b/NK_C_API.cc
index eae35d5..6905ef4 100644
--- a/NK_C_API.cc
+++ b/NK_C_API.cc
@@ -261,6 +261,30 @@ extern "C" {
 		});
 	}
 
+	NK_C_API int NK_get_status(struct NK_status* out) {
+		if (out == nullptr) {
+			return -1;
+		}
+		auto m = NitrokeyManager::instance();
+		auto result = get_with_status([&]() {
+			return m->get_status();
+		}, proto::stick10::GetStatus::ResponsePayload());
+		auto error_code = std::get<0>(result);
+		if (error_code != 0) {
+			return error_code;
+		}
+
+		auto status = std::get<1>(result);
+		out->firmware_version_major = status.firmware_version_st.major;
+		out->firmware_version_minor = status.firmware_version_st.minor;
+		out->serial_number_smart_card = status.card_serial_u32;
+		out->config_numlock = status.numlock;
+		out->config_capslock = status.capslock;
+		out->config_scrolllock = status.scrolllock;
+		out->otp_user_password = status.enable_user_password != 0;
+		return 0;
+	}
+
 	NK_C_API char * NK_device_serial_number() {
 		auto m = NitrokeyManager::instance();
 		return get_with_string_result([&]() {
diff --git a/NK_C_API.h b/NK_C_API.h
index 47b2567..c59beb4 100644
--- a/NK_C_API.h
+++ b/NK_C_API.h
@@ -137,6 +137,47 @@ extern "C" {
 		struct NK_device_info* next;
 	};
 
+	/**
+	 * Stores the common device status for all Nitrokey devices.
+	 */
+	struct NK_status {
+		/**
+		 * The major firmware version, e. g. 0 in v0.40.
+		 */
+		uint8_t firmware_version_major;
+		/**
+		 * The minor firmware version, e. g. 40 in v0.40.
+		 */
+		uint8_t firmware_version_minor;
+		/**
+		 * The serial number of the smart card.
+		 */
+		uint32_t serial_number_smart_card;
+		/**
+		 * The HOTP slot to generate a password from if the numlock
+		 * key is pressed twice (slot 0-1, or any other value to
+		 * disable the function).
+		 */
+		uint8_t config_numlock;
+		/**
+		 * The HOTP slot to generate a password from if the capslock
+		 * key is pressed twice (slot 0-1, or any other value to
+		 * disable the function).
+		 */
+		uint8_t config_capslock;
+		/**
+		 * The HOTP slot to generate a password from if the scrolllock
+		 * key is pressed twice (slot 0-1, or any other value to
+		 * disable the function).
+		 */
+		uint8_t config_scrolllock;
+		/**
+		 * Indicates whether the user password is required to generate
+		 * an OTP value.
+		 */
+		bool otp_user_password;
+	};
+
 	/**
 	 * Stores the status of a Storage device.
 	 */
@@ -317,6 +358,17 @@ extern "C" {
 	 */
 	NK_C_API char * NK_status();
 
+	/**
+	 * Get the stick status common to all Nitrokey devices and return the
+	 * command processing error code.  If the code is zero, i. e. the
+	 * command was successful, the storage status is written to the output
+	 * pointer's target.  The output pointer must not be null.
+	 *
+	 * @param out the output pointer for the status
+	 * @return command processing error code
+	 */
+	NK_C_API int NK_get_status(struct NK_status* out);
+
 	/**
 	 * Return the device's serial number string in hex.
 	 * @return string device's serial number in hex
-- 
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