SSL_write() extended to handle ctypes.Array as data

* dtls/openssl.py: SSL_write() can handle ctypes.Array data
* dtls/sslconnection.py: Added missing import ERR_BOTH_KEY_CERT_FILES
* dtls/test/simple_client.py: Added basic test client to use with dtls/test/echo_seq.py

dtls/test/echo_seq.py

@@ -36,12 +36,13 @@ import socket
 from os import path
 from logging import basicConfig, DEBUG
 basicConfig(level=DEBUG)  # set now for dtls import code
-from dtls.sslconnection import SSLConnection
-from dtls.err import SSLError, SSL_ERROR_WANT_READ, SSL_ERROR_ZERO_RETURN
-
-def main():
-    sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-    sck.bind(("127.0.0.1", 28000))
+from dtls.sslconnection import SSLConnection
+from dtls.err import SSLError, SSL_ERROR_WANT_READ, SSL_ERROR_ZERO_RETURN
+
+
+def main():
+    sck = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sck.bind(("127.0.0.1", 28000))
     sck.settimeout(30)
     cert_path = path.join(path.abspath(path.dirname(__file__)), "certs")
     scn = SSLConnection(

dtls/test/simple_client.py

@@ -0,0 +1,15 @@
+from os import path
+import ssl
+from socket import socket, AF_INET, SOCK_DGRAM, SHUT_RDWR
+from logging import basicConfig, DEBUG
+basicConfig(level=DEBUG)  # set now for dtls import code
+from dtls import do_patch
+do_patch()
+
+cert_path = path.join(path.abspath(path.dirname(__file__)), "certs")
+sock = ssl.wrap_socket(socket(AF_INET, SOCK_DGRAM), cert_reqs=ssl.CERT_REQUIRED, ca_certs=path.join(cert_path, "ca-cert.pem"))
+sock.connect(('localhost', 28000))
+sock.send('Hi there')
+print sock.recv()
+sock.unwrap()
+sock.shutdown(SHUT_RDWR)