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11_dot_injection/dot_stub.py

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+import socket
+import ssl
+import dns.message
+import dns.query
+import dns.rcode
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument('-dot', '--dot', default='dns.alidns.com')
+args = parser.parse_args()
+print(f'DoT server: {args.dot}')
+upstream_server = '47.88.31.213'
+
+# 创建监听socket
+listener = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+listener.bind(('127.0.0.1', 53))
+
+# 创建TLS连接
+context = ssl.create_default_context()
+context.check_hostname = False
+context.verify_mode = ssl.CERT_NONE
+while True:
+        # 接收DNS请求
+    data, addr = listener.recvfrom(1024)
+    #print(dns.message.from_wire(data))
+    data = dns.message.from_wire(data)
+    if 'baidu' in data.question.__str__():
+        # print(data)
+        # print(addr)
+        print('DNS请求：', data.question)
+        # # 创建TLS连接并发送DNS请求到上游服务器
+        resp = dns.query.tls(
+            q=data,
+            where=upstream_server,
+            timeout=10,
+            ssl_context=context)
+        print('DNS响应：', resp.answer)
+        # with socket.create_connection((upstream_server,853)) as sock:
+        #     with context.wrap_socket(sock, server_hostname=upstream_server[0]) as tls_sock:
+        #         tls_sock.sendall(data.to_wire())
+        #         resp = tls_sock.recv(4096)
+
+        # 将上游服务器的响应发送回客户端
+        listener.sendto(resp.to_wire(), addr)
+        break