add new examples

src/30-openssl/ssl_client_server/server.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+
+# Copyright 2018- The Pixie Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import socket
+import ssl
+import time
+import random
+
+listen_addr = '127.0.0.1'
+listen_port = 8082
+server_cert = 'server.crt'
+server_key = 'server.key'
+client_certs = 'client.crt'
+
+context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
+context.verify_mode = ssl.CERT_REQUIRED
+context.load_cert_chain(certfile=server_cert, keyfile=server_key)
+context.load_verify_locations(cafile=client_certs)
+
+bindsocket = socket.socket()
+bindsocket.bind((listen_addr, listen_port))
+bindsocket.listen(5)
+
+while True:
+    print("Waiting for client")
+    newsocket, fromaddr = bindsocket.accept()
+    print("Client connected: {}:{}".format(fromaddr[0], fromaddr[1]))
+    conn = context.wrap_socket(newsocket, server_side=True)
+    print("SSL established.")
+
+    count = 0
+    while True:
+        time.sleep(1)
+        data = conn.recv(1024)
+        print(data.decode())
+        secret = random.randint(0, 1024 * 1024 * 1024)
+        conn.send("Server secret {} is {}".format(count, secret).encode())
+        count += 1
+
+print("Closing connection")
+conn.shutdown(socket.SHUT_RDWR)
+conn.close()