s3:winbind: Add a lower-cost alternative to wbinfo -t: wbinfo --ping-dc

This just does a NULL RPC call through an existing NETLOGON connection. If
someone knows an operation that "just works" and does not return NOT_SUPPORTED,
please tell me :-)

2 files changed, 59 insertions, 0 deletions

diff --git a/nsswitch/libwbclient/wbc_pam.c b/nsswitch/libwbclient/wbc_pam.c
index 7a66a7fe82..00863a0d54 100644
--- a/nsswitch/libwbclient/wbc_pam.c
+++ b/nsswitch/libwbclient/wbc_pam.c
@@ -5,6 +5,7 @@
 
    Copyright (C) Gerald (Jerry) Carter 2007
    Copyright (C) Guenther Deschner 2008
+   Copyright (C) Volker Lendecke 2009
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -570,6 +571,50 @@ wbcErr wbcChangeTrustCredentials(const char *domain,
 	return wbc_status;
 }
 
+/*
+ * Trigger a no-op NETLOGON call. Lightweight version of
+ * wbcCheckTrustCredentials
+ */
+wbcErr wbcPingDc(const char *domain, struct wbcAuthErrorInfo **error)
+{
+	struct winbindd_request request;
+	struct winbindd_response response;
+	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
+
+	if (domain) {
+		/*
+		 * the current protocol doesn't support
+		 * specifying a domain
+		 */
+		wbc_status = WBC_ERR_NOT_IMPLEMENTED;
+		BAIL_ON_WBC_ERROR(wbc_status);
+	}
+
+	ZERO_STRUCT(request);
+	ZERO_STRUCT(response);
+
+	/* Send request */
+
+	wbc_status = wbcRequestResponse(WINBINDD_PING_DC,
+					&request,
+					&response);
+	if (response.data.auth.nt_status != 0) {
+		if (error) {
+			wbc_status = wbc_create_error_info(NULL,
+							   &response,
+							   error);
+			BAIL_ON_WBC_ERROR(wbc_status);
+		}
+
+		wbc_status = WBC_ERR_AUTH_ERROR;
+		BAIL_ON_WBC_ERROR(wbc_status);
+	}
+	BAIL_ON_WBC_ERROR(wbc_status);
+
+ done:
+	return wbc_status;
+}
+
 /* Trigger an extended logoff notification to Winbind for a specific user */
 wbcErr wbcLogoffUserEx(const struct wbcLogoffUserParams *params,
 		       struct wbcAuthErrorInfo **error)
diff --git a/nsswitch/libwbclient/wbclient.h b/nsswitch/libwbclient/wbclient.h
index eea71ab86b..33a4ace75c 100644
--- a/nsswitch/libwbclient/wbclient.h
+++ b/nsswitch/libwbclient/wbclient.h
@@ -4,6 +4,7 @@
    Winbind client API
 
    Copyright (C) Gerald (Jerry) Carter 2007
+   Copyright (C) Volker Lendecke 2009
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -1214,6 +1215,19 @@ wbcErr wbcCheckTrustCredentials(const char *domain,
 wbcErr wbcChangeTrustCredentials(const char *domain,
 				 struct wbcAuthErrorInfo **error);
 
+/**
+ * @brief Trigger a no-op call through the NETLOGON pipe. Low-cost
+ *        version of wbcCheckTrustCredentials
+ *
+ * @param *domain      The name of the domain, only NULL for the default domain is
+ *                     supported yet. Other values than NULL will result in
+ *                     WBC_ERR_NOT_IMPLEMENTED.
+ * @param error        Output details on WBC_ERR_AUTH_ERROR
+ *
+ * @return #wbcErr
+ **/
+wbcErr wbcPingDc(const char *domain, struct wbcAuthErrorInfo **error);
+
 /**********************************************************
  * Helper functions
  **********************************************************/