Christian Heimes added the comment:
If I understand the man page of SSL_shutdown correctly, than SSL_shutdown()
must be called a second time when the first time returned 0. But it does not
say how an application shall behave if the second call to SSL_shutdown() also
returns 0.
OpenSSL does not contain an example for bidirectional shutdown. s_client.c only
does unidirectional shutdown.
cURL just ignores the result:
/*
* This function is called when an SSL connection is closed.
*/
void Curl_ossl_close(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
if(connssl->handle) {
(void)SSL_shutdown(connssl->handle);
SSL_set_connect_state(connssl->handle);
SSL_free (connssl->handle);
connssl->handle = NULL;
}
if(connssl->ctx) {
SSL_CTX_free (connssl->ctx);
connssl->ctx = NULL;
}
}
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<http://bugs.python.org/issue30437>
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