Adds Kuryr-sctp-demo application

Adds the sctp-demo server and client application to test_container.

Partially-Implements: blueprint sctp-support
Change-Id: I4b6d3a0e8bff7fdeb23ec8de046ea71dbf690069

devstack/plugin.sh

@@ -7,8 +7,12 @@ function build_test_container {
     #               hence this awful if clause.
     if [[ ${CONTAINER_ENGINE} == 'crio' ]]; then
         sudo buildah bud -t quay.io/kuryr/demo -f Dockerfile .
+        sudo buildah bud -t quay.io/kuryr/sctp-demo -f \
+            kuryr_sctp_demo/Dockerfile .
     else
         docker build -t quay.io/kuryr/demo . -f Dockerfile
+        docker build -t quay.io/kuryr/sctp-demo . -f \
+            kuryr_sctp_demo/Dockerfile
     fi
     popd
 }

test_container/kuryr_sctp_demo/Dockerfile

@@ -0,0 +1,29 @@
+FROM quay.io/kuryr/alpine:3.12
+
+RUN apk add --no-cache \
+                bash \
+                gcc \
+                g++ \
+                libstdc++ \
+                linux-headers \
+                lksctp-tools \
+                lksctp-tools-dev \
+                openssh-client \
+                net-tools \
+                python3 \
+                py3-pip \
+                python3-dev
+
+ENV BUSYBOX_VERSION 1.31.1
+RUN adduser -S kuryr
+USER kuryr
+
+WORKDIR /home/kuryr
+COPY kuryr_sctp_demo/sctp_server.py /sctp_server.py
+COPY kuryr_sctp_demo/sctp_client.py /home/kuryr/sctp_client.py
+
+RUN pip3 --no-cache-dir install -U pip \
+        && python3 -m pip install pysctp
+
+EXPOSE 9090
+ENTRYPOINT ["python3", "/sctp_server.py"]

test_container/kuryr_sctp_demo/sctp_client.py

@@ -0,0 +1,32 @@
+# 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.
+
+import socket
+import sys
+
+import sctp
+
+sk = sctp.sctpsocket_tcp(socket.AF_INET)
+
+
+def connect_plus_message(out_ip, out_port):
+    sk.connect((out_ip, out_port))
+    print("Sending Message")
+    sk.sctp_send(msg='HELLO, I AM ALIVE!!!')
+    msgFromServer = sk.recvfrom(1024)
+    print(msgFromServer[0].decode('utf-8'))
+    sk.shutdown(0)
+    sk.close()
+
+
+if __name__ == '__main__':
+    connect_plus_message(sys.argv[1], int(sys.argv[2]))

test_container/kuryr_sctp_demo/sctp_server.py

@@ -0,0 +1,41 @@
+# 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.
+
+import platform
+import sctp
+import socket
+
+
+host = '0.0.0.0'
+port = 9090
+
+sock = sctp.sctpsocket_tcp(socket.AF_INET)
+sock.bind((host, port))
+sock.listen(1)
+
+while True:
+    # wait for a connection
+    connection, client_address = sock.accept()
+
+    try:
+        while True:
+            data = connection.recv(1024)
+            if data:
+                # send response to client.
+                response = '%s: HELLO, I AM ALIVE!!!' % platform.node()
+                sent = connection.send(response.encode('utf-8'))
+            else:
+                # no more data -- quit the loop
+                break
+    finally:
+        # Clean up the connection
+        connection.close()