LdapConnection 绑定超时

Question

有没有办法使用 .NET 附带的 System.DirectoryServices.Protocols.LdapConnection 在 LDAP 连接上设置 bind 超时？不要与 connection 超时混淆（即 Timeout property). Essentially, I need to set the LDAP_OPT_TIMELIMIT as described here.

LdapSessionOptions 似乎是那个地方，但据我所知，这个特定选项不存在。还有什么我想念的吗？

Answer 1

这是我想出的解决方案：

private const int LDAP_OPT_TIMELIMIT = 0x04;

[DllImport("Wldap32.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "ldap_set_optionW", CharSet = CharSet.Unicode)]
private static extern int ldap_set_option([In] IntPtr handle, [In] int option, [In] ref int inValue);

private static void SetLdapConnectionBindTimeout(LdapConnection conn, int timeoutSeconds)
{
    // We need the underlying LdapConnection handle; that's internal, so reflection here we go.
    var handleField = typeof(LdapConnection).GetField("ldapHandle", BindingFlags.NonPublic | BindingFlags.Instance);
    var handleWrapper = handleField.GetValue(conn);

    // That handle object is itself a wrapper class around the IntPtr we actually need.
    // The wrapper class is internal, and so is the IntPtr, so more reflection.
    var internalHandleField = handleWrapper.GetType().GetField("handle", BindingFlags.NonPublic | BindingFlags.Instance);
    var internalHandle = (IntPtr)internalHandleField.GetValue(handleWrapper);

    // Now we can set. 
    ldap_set_option(internalHandle, LDAP_OPT_TIMELIMIT, ref timeoutSeconds);
}

这行得通，但我当然不喜欢所有的反射。或者 DllImport，尽管 .NET 库无论如何都在幕后使用它，所以我觉得这没什么大不了的。

根据下面的评论，这里还需要注意的是，由于对 Wldap32.dll 的依赖，这似乎是 Windows-only，不适合跨平台。

LdapConnection 绑定超时

LdapConnection Bind Timeout

.net

c#

ldap