diff --git a/get_xha_user_pwd.py b/get_xha_user_pwd.py
index b695d9a..2276cd1 100644
--- a/get_xha_user_pwd.py
+++ b/get_xha_user_pwd.py
@@ -3,6 +3,7 @@ import json
 import random
 import subprocess
 import syslog
+import warnings
 
 def print(*a, sep=' '): syslog.syslog(sep.join(map(str, a)))
 
@@ -10,14 +11,22 @@ import argparse
 parser = argparse.ArgumentParser()
 parser.add_argument("-i", "--interface", help="网卡接口名称 interface")
 args = parser.parse_args()
+interface = args.interface
+interface_def = interface is None
 
 def request_get_text(url, headers={}):
     req = request.Request(url, headers=headers)
     with request.urlopen(req) as response:
         return response.read().decode('utf-8')
 
+def append_interface(command, pre, interface):
+    if not interface_def:
+        command += [pre, interface]
+
 def check_connectivity_ping(host, interface):
-    command = ['ping', '-I', interface, '-c', '1', host]  # -n 1 on windows, -c 1 on linux
+    command = ['ping']
+    append_interface(command, '-I', interface)
+    command += ['-c', '1', host]  # -n 1 on windows, -c 1 on linux
     try:
         result = subprocess.check_call(command, timeout=2)
         return result == 0
@@ -31,10 +40,8 @@ def check_connectivity_ping(host, interface):
         return False
 
 device = 0
-interface = args.interface
-if interface is None:
-    print("Please specify the interface name using -i or --interface")
-    exit()
+if interface_def:
+    warnings.warn("no interface given by -i or --interface, use default route")
 
 # 检测网络联通性
 if check_connectivity_ping("223.5.5.5", interface):
@@ -45,7 +52,8 @@ with open("user_pwd.txt", 'r') as f:
 
 user_pwd_error_or_not_unlimit_combo = []
 # 检查是否付费
-while True:
+not_succ = True
+while not_succ:
     # 随机选择，防止前面有密码错误的用户卡死
     user, pwd = random.choice(user_pwd)
     if user in user_pwd_error_or_not_unlimit_combo:
@@ -70,24 +78,32 @@ while True:
         if int(j1['count']) == device:
             # 判断密码是否正确
             url = f"https://xha.ouc.edu.cn:802/eportal/portal/login?callback=dr1003&login_method=1&user_account={user}&user_password={pwd}&wlan_user_ip=0.0.0.0&wlan_user_ipv6=&wlan_user_mac=000000000000&wlan_ac_ip=&wlan_ac_name=&jsVersion=4.1&terminal_type=1&lang=zh-cn&v=2425&lang=zh"
-            command = ["curl", url, "--interface", interface]
-            result = subprocess.run(command, capture_output=True, text=True)
-            result = json.loads(result.stdout[7:-2])
+            if interface_def:
+                res = request_get_text(url)
+            else:
+                command = ["curl", url, "--interface", interface]
+                res = subprocess.check_output(command, text=True)
+            result = json.loads(res[7:-2])
             """
             dr1003({"result":0,"msg":"账号不存在","ret_code":1});
             dr1003({"result":0,"msg":"密码错误","ret_code":1});
             dr1003({"result":1,"msg":"Portal协议认证成功！"});
             dr1003({"result":0,"msg":"IP: 10.142.5.160 已经在线！","ret_code":2});
             """
+            msg = ""
+            if not interface_def:
+                print(f"使用接口 {interface} 进行请求")
+                msg += f"接口 {interface}： "
             if '密码错误' in result['msg']:
-                print(f"接口 {interface}： {user} {pwd} 密码错误")
+                print(f"{user} {pwd} 密码错误")
                 user_pwd_error_or_not_unlimit_combo.append(user)
             elif '已经在线' in result['msg']:
-                print(f"接口 {interface}： 正常在线！")
-                break
+                msg += "正常在线！"
+                not_succ = False
             elif '认证成功' in result['msg']:
-                print(f"接口 {interface}：使用账号{user}登录成功!")
-                break
+                msg += f"使用账号{user}登录成功!"
+                not_succ = False
+            print(msg)
     else:
         user_pwd_error_or_not_unlimit_combo.append(user)
 # 删除密码错误或不满足要求的用户