New submission from Martin Panter:
The documentation claims that SSL socket objects provide some of the same
methods as plain socket objects, including recv(), and that the “bufsize”
parameter specifies the maximum amount of data to be received. With ordinary
sockets, socket.recv(0) always seems to return zero bytes (b""), as expected.
But not so with SSL sockets:
>>> import socket, ssl
>>> s = ssl.wrap_socket(socket.create_connection(("localhost", 631)))
>>> s.sendall(b"GET / HTTP/1.1\r\nHost: localhost\r\n\r\n")
35
>>> len(s.recv(0))
263
>>> len(s.recv(0))
1024
The call will hang or raise SSLWantReadError when no data is actually
available. Looking at the code, the value of zero seems to be used as a
placeholder for a default of 1024 in SSLObject.read(). Either the SSL module
should be fixed to return no bytes (my preference), or the documentation needs
to warn that the recv(0) is not supported, or does not work the same as for
plain sockets. SSLSocket.read() might also be affected.
----------
components: Library (Lib)
messages: 239483
nosy: vadmium
priority: normal
severity: normal
status: open
title: SSLSocket.recv(0) receives up to 1024 bytes
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5
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Python tracker <[email protected]>
<http://bugs.python.org/issue23804>
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