Simple SSL client hangs

[Douglas Wells]

In article <871r821wlg.fsf at hornfels.zedat.fu-berlin.de>,
Loris Bennett <loris.bennett at fu-berlin.de> wrote:
>In Perl I have the following
>
>  use IO::Socket::SSL;
>  my $my_socket = new IO::Socket::SSL(PeerAddr => 'some.server.somewhere,
>  				      PeerPort => 12345,
>  				     );
>  my $line = <$my_socket>;
>  print("$line\n");
>  say $my_socket 'ECHO 1';
>  $line = <$my_socket>;
>  print("$line\n");
>
>This runs as expected and I get
>
>  200 Some Server Somewhere - Hello [123.456.789.123]
>  310 Hello Echo
>
>If I try the same with the following Python code:
>
>  import socket
>  import ssl
>  HOST = "some.server.somewhere"
>  PORT = 12345
>  context = ssl.create_default_context()
>  with socket.create_connection((HOST, PORT)) as sock:
>      with context.wrap_socket(sock, server_hostname=HOST) as ssock:
>          data = ssock.recv(1024)
>          print(data.decode())
>          ssock.write(b'ECHO 1')
>          data = ssock.read(1024)
>          print(data.decode())
>
>I get a timeout for the 'ECHO' command:
>
>  200 Some Server Somewhere - Hello [123.456.789.123]
>  501 Timeout
>
>Does anyone have an idea what I might be doing wrong?

Loris,

You don't specify the type of your server, but it looks like a
"normal" SMTP or NNTP or whatever server.  This type of server is line
oriented.

The Perl "say" operation adds a trailing line terminator.  The Python
"ssl:write" does not.  Try adding an appropriate line terminator to
your Python code.  Most likely it needs to be CR-LF.  Perhaps use
"ssock.write(b'ECHO 1\r\n')

 - dmw