Simple SSL client hangs

Wed Jul 14 01:54:30 EDT 2021

Hi,
MRAB <python at mrabarnett.plus.com> writes:
> On 2021年07月13日 08:50, Loris Bennett wrote:
>> Hi,
>>>> 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?
>>> The docs for Perl says that 'say' appends a newline.
>> On the other hand, 'ssock.write' doesn't append a newline.
>> Could that be the problem?

Thanks and well-spotted everyone! The missing newline was indeed the
problem. With
 ssock.write(b'ECHO 1\n')
the Python codes behaves like the Perl code.
Cheers,
Loris
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