Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/server/shadow/shadow_subsystem_builtin.c

@@ -0,0 +1,74 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ *
+ * Copyright 2016 Jiang Zihao <zihao.jiang@yahoo.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <freerdp/config.h>
+
+#include <freerdp/server/shadow.h>
+
+typedef struct
+{
+	const char* (*name)(void);
+	pfnShadowSubsystemEntry entry;
+} RDP_SHADOW_SUBSYSTEM;
+
+extern int ShadowSubsystemEntry(RDP_SHADOW_ENTRY_POINTS* pEntryPoints);
+extern const char* ShadowSubsystemName(void);
+
+static const RDP_SHADOW_SUBSYSTEM g_Subsystems[] = {
+
+	{ ShadowSubsystemName, ShadowSubsystemEntry }
+};
+
+static const size_t g_SubsystemCount = ARRAYSIZE(g_Subsystems);
+
+WINPR_ATTR_NODISCARD
+static pfnShadowSubsystemEntry shadow_subsystem_load_static_entry(const char* name)
+{
+	if (!name)
+	{
+		if (g_SubsystemCount > 0)
+		{
+			const RDP_SHADOW_SUBSYSTEM* cur = &g_Subsystems[0];
+			WINPR_ASSERT(cur->entry);
+
+			return cur->entry;
+		}
+
+		return nullptr;
+	}
+
+	for (size_t index = 0; index < g_SubsystemCount; index++)
+	{
+		const RDP_SHADOW_SUBSYSTEM* cur = &g_Subsystems[index];
+		WINPR_ASSERT(cur->name);
+		WINPR_ASSERT(cur->entry);
+
+		if (strcmp(name, cur->name()) == 0)
+			return cur->entry;
+	}
+
+	return nullptr;
+}
+
+void shadow_subsystem_set_entry_builtin(const char* name)
+{
+	pfnShadowSubsystemEntry entry = shadow_subsystem_load_static_entry(name);
+
+	if (entry)
+		shadow_subsystem_set_entry(entry);
+}