diff --git a/include/common.h b/include/common.h
index 7393511..532c8ef 100644
--- a/include/common.h
+++ b/include/common.h
@@ -3,11 +3,22 @@
 
 #define VERSION "1.3.0-dev"
 
+#define TRUE  1
+#define FALSE 0
+
+#define DOMESTIC_PORT 4053
+#define FOREIGN_PORT  6053
+
+#define DNSPROXY_BIN "dnsproxy"
+#define OVERTURE_BIN "overture"
+#define ADGUARD_BIN  "AdGuardHome"
+
+
 //extern char **adguard_command;
 //extern char **overture_command;
 //extern char **domestic_dnsproxy_command;
 //extern char **foreign_dnsproxy_command;
-//
+
 //void load_start_command(char *adguard_workdir, char *overture_config, char *upstream_config, int is_debug);
 
 #endif
diff --git a/include/dnsproxy.h b/include/dnsproxy.h
new file mode 100644
index 0000000..286446f
--- /dev/null
+++ b/include/dnsproxy.h
@@ -0,0 +1,18 @@
+#ifndef _DNSPROXY_H_
+#define _DNSPROXY_H_
+
+typedef struct {
+    int port;
+    int verify; // bool value
+    int parallel; // bool value
+    int optimistic; // bool value
+    char **bootstrap;
+    char **fallback;
+    char **primary;
+    char *cache;
+} dnsproxy;
+
+dnsproxy* dnsproxy_init(int port);
+void dnsproxy_dump(char *caption, dnsproxy *info);
+
+#endif
diff --git a/include/utils/logger.h b/include/utils/logger.h
index 48ecc04..e731e59 100644
--- a/include/utils/logger.h
+++ b/include/utils/logger.h
@@ -1,5 +1,5 @@
-#ifndef _LOG_H
-#define _LOG_H
+#ifndef _LOGGER_H_
+#define _LOGGER_H_
 
 enum {
     LOG_DEBUG,
diff --git a/include/utils/strList.h b/include/utils/strList.h
new file mode 100644
index 0000000..02ede62
--- /dev/null
+++ b/include/utils/strList.h
@@ -0,0 +1,11 @@
+#ifndef _STRLIST_H_
+#define _STRLIST_H_
+
+char* string_init(char *str);
+
+char** string_list_init();
+int string_list_len(char **string_list);
+char* string_list_dump(char **string_list);
+char** string_list_append(char **string_list, char *string);
+
+#endif
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d303d47..a2d0262 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -5,5 +5,5 @@ include_directories(${PROJECT_SOURCE_DIR}/include/utils)
 
 add_subdirectory(utils)
 
-add_executable(cleardns cleardns.c)
+add_executable(cleardns cleardns.c dnsproxy.c)
 target_link_libraries(cleardns utils)
diff --git a/src/cleardns.c b/src/cleardns.c
index 6cef540..01b7c43 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -1,5 +1,6 @@
 #include "logger.h"
 #include "common.h"
+#include "dnsproxy.h"
 
 //#include <stdio.h>
 //#include <string.h>
@@ -27,8 +28,13 @@
 
 int main(int argc, char *argv[]) { // ClearDNS server
 
+    LOG_LEVEL = LOG_DEBUG;
+
     log_info("ClearDNS server start (%s)", VERSION);
 
+    dnsproxy *domestic = dnsproxy_init(DOMESTIC_PORT);
+    dnsproxy_dump("Domestic", domestic);
+
 //    int debug_mode = 0;
 //    fprintf(stderr, "[ClearDNS] Server start.\n");
 //    for (char **p = argv; p < argv + argc; ++p) {
diff --git a/src/common.c b/src/common.c
index d1021d7..0803a4e 100644
--- a/src/common.c
+++ b/src/common.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
+#include <strList.bak>
 #include "cJSON.h"
 #include "flag.h"
 
diff --git a/src/dnsproxy.c b/src/dnsproxy.c
new file mode 100644
index 0000000..e4b9fdd
--- /dev/null
+++ b/src/dnsproxy.c
@@ -0,0 +1,54 @@
+#include <stdlib.h>
+#include "dnsproxy.h"
+#include "logger.h"
+#include "common.h"
+#include "strList.h"
+
+char* show_bool(int value) {
+    if (value) {
+        return "true";
+    } else {
+        return "false";
+    }
+}
+
+char** command_init(char *file) {
+    return string_list_append(string_list_init(), file);
+}
+
+dnsproxy* dnsproxy_init(int port) {
+    dnsproxy *info = (dnsproxy*)malloc(sizeof(dnsproxy));
+    info->port = port;
+    info->verify = TRUE;
+    info->parallel = TRUE;
+    info->optimistic = FALSE;
+    info->bootstrap = string_list_init();
+    info->fallback = string_list_init();
+    info->primary = string_list_init();
+    info->cache = "4194304"; // 4MiB
+    return info;
+}
+
+void dnsproxy_dump(char *caption, dnsproxy *info) {
+    log_debug("%s listen port -> %d", caption, info->port);
+    log_debug("%s verify -> %s", caption, show_bool(info->verify));
+    log_debug("%s parallel -> %s", caption, show_bool(info->parallel));
+    log_debug("%s optimistic -> %s", caption, show_bool(info->optimistic));
+
+    log_debug("%s bootstrap -> %s", caption, string_list_dump(info->bootstrap));
+    log_debug("%s fallback -> %s", caption, string_list_dump(info->fallback));
+    log_debug("%s primary -> %s", caption, string_list_dump(info->primary));
+
+    log_debug("%s cache -> %s", caption, info->cache);
+
+    char **test = string_list_init();
+    test = string_list_append(test, "0");
+    test = string_list_append(test, "1");
+    test = string_list_append(test, "2");
+
+//    char *test[] = {NULL};
+//    char *test[] = {"dnomd343", "2333", NULL};
+    log_warn("%s", string_list_dump(test));
+    log_warn("%d", string_list_len(test));
+
+}
diff --git a/src/utils/CMakeLists.txt b/src/utils/CMakeLists.txt
index cc3bdc1..b82db9b 100644
--- a/src/utils/CMakeLists.txt
+++ b/src/utils/CMakeLists.txt
@@ -1,3 +1,3 @@
 cmake_minimum_required(VERSION 2.8.12)
 
-add_library(utils cJSON.c logger.c)
+add_library(utils logger.c strList.c)
diff --git a/src/utils/cJSON.c b/src/utils/cJSON.c
index 3063f74..e40e4bb 100644
--- a/src/utils/cJSON.c
+++ b/src/utils/cJSON.c
@@ -37,7 +37,7 @@
 #pragma warning (disable : 4001)
 #endif
 
-#include <string.h>
+#include <strList.bak>
 #include <stdio.h>
 #include <math.h>
 #include <stdlib.h>
diff --git a/src/utils/strList.c b/src/utils/strList.c
new file mode 100644
index 0000000..a2ee359
--- /dev/null
+++ b/src/utils/strList.c
@@ -0,0 +1,47 @@
+#include <stdlib.h>
+#include <string.h>
+#include "strList.h"
+
+char* string_init(char *str) {
+    return strcpy((char*)malloc(strlen(str) + 1), str);
+}
+
+char* string_list_dump(char **string_list) { // ['a', 'b', 'c', ...]
+    unsigned long string_len = 0;
+    for (char **string = string_list; *string != NULL; ++string) {
+        string_len += strlen(*string) + 4;
+    }
+    if (string_len == 0) { // empty string
+        string_len = 2;
+    }
+    char *string_ret = (char *)malloc(sizeof(char) * (string_len + 1));
+    string_ret[0] = '[';
+    string_ret[1] = 0x00;
+    for (char **string = string_list; *string != NULL; ++string) {
+        string_ret = strcat(strcat(string_ret, "'"), *string);
+        string_ret = strcat(string_ret, "', ");
+    }
+    string_ret[string_len - 1] = ']';
+    string_ret[string_len] = 0x00;
+    return string_ret;
+}
+
+int string_list_len(char **string_list) {
+    int num = 0;
+    while(string_list[num++] != NULL); // get string list size
+    return num - 1;
+}
+
+char** string_list_init() {
+    char **string_list = (char**)malloc(sizeof(char*));
+    *string_list = NULL;
+    return string_list;
+}
+
+char** string_list_append(char **string_list, char *string) {
+    int len = string_list_len(string_list);
+    string_list = (char**)realloc(string_list, sizeof(char**) * (len + 2));
+    string_list[len] = string_init(string);
+    string_list[len + 1] = NULL; // list end sign
+    return string_list;
+}