sub do_init {
    my $sftp = shift;
    my $ssh = $sftp->{ssh};

    $sftp->debug("Sending SSH2_FXP_INIT");
    my $msg = $sftp->new_msg(SSH2_FXP_INIT);
    $msg->put_int32(SSH2_FILEXFER_VERSION);
    $sftp->send_msg($msg);

    $msg = $sftp->get_msg;
    my $type = $msg->get_int8;
    if ($type != SSH2_FXP_VERSION) {
        croak "Invalid packet back from SSH2_FXP_INIT (type $type)";
    }
    my $version = $msg->get_int32;
    $sftp->debug("Remote version: $version");

    ## XXX Check for extensions.
}
.
.
.
sub send_msg {
    my $sftp = shift;
    my($buf) = @_;
    my $b = Net::SFTP::Buffer->new;
    $b->put_int32($buf->length);
    $b->append($buf->bytes);
    $sftp->{channel}->send_data($b->bytes);
}