func (self *SSL) Shutdown() error {
//shutdown should happen in 2 steps
//see http://www.openssl.org/docs/ssl/SSL_shutdown.html
defer self.Free()
ret := C.SSL_shutdown(self.SSL)
if int(ret) == 0 {
ret = C.SSL_shutdown(self.SSL)
if int(ret) != 1 {
return self.getError(ret)
}
}
return nil
}
func (c *Conn) shutdown() func() error {
c.mtx.Lock()
defer c.mtx.Unlock()
runtime.LockOSThread()
defer runtime.UnlockOSThread()
rv, errno := C.SSL_shutdown(c.ssl)
if rv > 0 {
return nil
}
if rv == 0 {
// The OpenSSL docs say that in this case, the shutdown is not
// finished, and we should call SSL_shutdown() a second time, if a
// bidirectional shutdown is going to be performed. Further, the
// output of SSL_get_error may be misleading, as an erroneous
// SSL_ERROR_SYSCALL may be flagged even though no error occurred.
// So, TODO: revisit bidrectional shutdown, possibly trying again.
// Note: some broken clients won't engage in bidirectional shutdown
// without tickling them to close by sending a TCP_FIN packet, or
// shutting down the write-side of the connection.
return nil
} else {
return c.getErrorHandler(rv, errno)
}
}