fix: security hardening (#112-#118)

src/shared/log.h

@@ -1,9 +1,12 @@
 #ifndef LOG_H
 #define LOG_H
 
+#include <stdio.h>
+
 typedef enum { LOG_LEVEL_DEBUG, LOG_LEVEL_INFO, LOG_LEVEL_WARNING, LOG_LEVEL_ERROR } LogLevel;
 
 void log_message(LogLevel log_level, char* message, ...);
 void set_log_level(LogLevel level);
+void log_set_file(FILE* fp);
 
 #endif