build: git describe tag as version info

.gitignore

@@ -1,7 +1,9 @@
 /bin/
 /.idea/
-/assets/*.txt
 /src/target/
 /cmake-build/
 /cmake-build-debug/
 /cmake-build-release/
+
+/assets/*.txt
+/include/constant.h

CMakeLists.txt

@@ -1,6 +1,45 @@
 cmake_minimum_required(VERSION 2.8.12)
-project(cleardns)
 
-set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
+project(cleardns LANGUAGES C)
+
+set(CMAKE_C_STANDARD 99)
+
+set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin/)
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Werror")
+
+###############################################################
+
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Release)
+endif()
+
+if(NOT CMAKE_EXE_LINKER_FLAGS)
+    set(CMAKE_EXE_LINKER_FLAGS -static)
+endif()
+
+###############################################################
+
+macro(git_tag _tag)
+    find_package(Git QUIET)
+    if (GIT_FOUND)
+        execute_process(
+            COMMAND ${GIT_EXECUTABLE} describe --tags
+            OUTPUT_VARIABLE ${_tag}
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+            WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+        )
+    endif()
+endmacro()
+
+set(VERSION "")
+git_tag(VERSION)
+if(VERSION STREQUAL "")  # without git tag
+    message(FATAL_ERROR "Git command not found")
+endif()
+
+###############################################################
 
 add_subdirectory(src)
+
+###############################################################

include/constant.h → include/constant.h.in

@@ -13,9 +13,7 @@
 #define RESTART_DELAY    1
 #define DIVERTER_TIMEOUT 6
 
-// TODO: using CMAKE template
-
-#define VERSION     "1.3.3"
+#define VERSION     "@VERSION@"
 #define CONFIG_FILE "cleardns.yml"
 
 #define DNSPROXY_BIN "dnsproxy"

src/CMakeLists.txt

@@ -9,6 +9,11 @@ include_directories(${PROJECT_SOURCE_DIR}/include/loader)
 
 link_directories(${PROJECT_SOURCE_DIR}/src/target/release)
 
+configure_file(
+    ${PROJECT_SOURCE_DIR}/include/constant.h.in
+    ${PROJECT_SOURCE_DIR}/include/constant.h
+)
+
 add_subdirectory(utils)
 add_subdirectory(applet)
 add_subdirectory(bcrypt)

src/cleardns.c

@@ -5,7 +5,6 @@
 #include <sys/wait.h>
 #include "loader.h"
 #include "logger.h"
-#include "sundry.h"
 #include "system.h"
 #include "assets.h"
 #include "adguard.h"

src/common/sundry.c

@@ -49,7 +49,7 @@ void uint32_list_debug(char *describe, uint32_t **uint32_list) { // show uint32
 }
 
 uint8_t check_port(uint16_t port) { // whether port is valid
-    if (port > 0 && port <= 65535) { // 1 ~ 65535
+    if (port > 0) { // 1 ~ 65535 (uint16_t <= 65535)
         return TRUE;
     }
     return FALSE;