Add wbcContext struct, create and free functions

The basic context structure and functions for libwbclient so that
libwbclient can be made thread-safe.

Signed-off-by: Matthew Newton <matthew-git@newtoncomputing.co.uk>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

3 files changed, 78 insertions, 0 deletions

diff --git a/nsswitch/libwbclient/wbclient.c b/nsswitch/libwbclient/wbclient.c
index 93c0318e5e..e6b3e4e9e1 100644
--- a/nsswitch/libwbclient/wbclient.c
+++ b/nsswitch/libwbclient/wbclient.c
@@ -4,6 +4,7 @@
    Winbind client API
 
    Copyright (C) Gerald (Jerry) Carter 2007
+   Copyright (C) Matthew Newton 2015
 
 
    This library is free software; you can redistribute it and/or
@@ -27,6 +28,8 @@
 
 /* From wb_common.c */
 
+struct winbindd_context;
+
 NSS_STATUS winbindd_request_response(struct winbindd_context *wbctx,
 				     int req_type,
 				     struct winbindd_request *request,
@@ -35,6 +38,9 @@ NSS_STATUS winbindd_priv_request_response(struct winbindd_context *wbctx,
 					  int req_type,
 					  struct winbindd_request *request,
 					  struct winbindd_response *response);
+struct winbindd_context *winbindd_ctx_create(void);
+void winbindd_ctx_free(struct winbindd_context *ctx);
+
 
 /*
  result == NSS_STATUS_UNAVAIL: winbind not around
@@ -259,3 +265,41 @@ wbcErr wbcLibraryDetails(struct wbcLibraryDetails **_details)
 	*_details = info;
 	return WBC_ERR_SUCCESS;
 }
+
+/* Context handling functions */
+
+static void wbcContextDestructor(void *ptr)
+{
+	struct wbcContext *ctx = (struct wbcContext *)ptr;
+
+	winbindd_ctx_free(ctx->winbindd_ctx);
+}
+
+struct wbcContext *wbcCtxCreate(void)
+{
+	struct wbcContext *ctx;
+	struct winbindd_context *wbctx;
+
+	ctx = (struct wbcContext *)wbcAllocateMemory(
+		1, sizeof(struct wbcContext), wbcContextDestructor);
+
+	if (!ctx) {
+		return NULL;
+	}
+
+	wbctx = winbindd_ctx_create();
+
+	if (!wbctx) {
+		wbcFreeMemory(ctx);
+		return NULL;
+	}
+
+	ctx->winbindd_ctx = wbctx;
+
+	return ctx;
+}
+
+void wbcCtxFree(struct wbcContext *ctx)
+{
+	wbcFreeMemory(ctx);
+}
diff --git a/nsswitch/libwbclient/wbclient.h b/nsswitch/libwbclient/wbclient.h
index dc3e822b7e..265cf43b96 100644
--- a/nsswitch/libwbclient/wbclient.h
+++ b/nsswitch/libwbclient/wbclient.h
@@ -5,6 +5,7 @@
 
    Copyright (C) Gerald (Jerry) Carter 2007
    Copyright (C) Volker Lendecke 2009
+   Copyright (C) Matthew Newton 2015
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -94,6 +95,13 @@ struct wbcInterfaceDetails {
 	char *dns_domain;
 };
 
+/**
+ *  @brief Library context data
+ *
+ **/
+
+struct wbcContext;
+
 /*
  * Data types used by the Winbind Client API
  */
@@ -523,6 +531,28 @@ struct wbcDomainControllerInfoEx {
 void wbcFreeMemory(void*);
 
 
+/**********************************************************
+ * Context Management
+ **********************************************************/
+
+/**
+ * @brief Create a new wbcContext context
+ *
+ * @return wbcContext
+ **/
+struct wbcContext *wbcCtxCreate(void);
+
+/**
+ * @brief Free a library context
+ *
+ * @param ctx           wbcContext to free
+ *
+ * @return void
+ **/
+void wbcCtxFree(struct wbcContext *ctx);
+
+
+
 /*
  * Utility functions for dealing with SIDs
  */
diff --git a/nsswitch/libwbclient/wbclient_internal.h b/nsswitch/libwbclient/wbclient_internal.h
index 31f413057e..e55bf27c0d 100644
--- a/nsswitch/libwbclient/wbclient_internal.h
+++ b/nsswitch/libwbclient/wbclient_internal.h
@@ -22,6 +22,10 @@
 #ifndef _WBCLIENT_INTERNAL_H
 #define _WBCLIENT_INTERNAL_H
 
+struct wbcContext {
+	struct winbindd_context *winbindd_ctx;
+};
+
 /* Private functions */
 
 wbcErr wbcRequestResponse(int cmd,