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+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Defines InterceptionAgent, the class in charge of setting up interceptions
+// from the inside of the sandboxed process. For more details see
+// http://dev.chromium.org/developers/design-documents/sandbox .
+
+#ifndef SANDBOX_SRC_INTERCEPTION_AGENT_H__
+#define SANDBOX_SRC_INTERCEPTION_AGENT_H__
+
+#include "base/macros.h"
+#include "sandbox/win/src/nt_internals.h"
+#include "sandbox/win/src/sandbox_types.h"
+
+namespace sandbox {
+
+// Internal structures used for communication between the broker and the target.
+struct DllInterceptionData;
+struct SharedMemory;
+struct DllPatchInfo;
+
+class ResolverThunk;
+
+// The InterceptionAgent executes on the target application, and it is in charge
+// of setting up the desired interceptions or indicating what module needs to
+// be unloaded.
+//
+// The exposed API consists of three methods: GetInterceptionAgent to retrieve
+// the single class instance, OnDllLoad and OnDllUnload to process a dll being
+// loaded and unloaded respectively.
+//
+// This class assumes that it will get called for every dll being loaded,
+// starting with kernel32, so the singleton will be instantiated from within the
+// loader lock.
+class InterceptionAgent {
+ public:
+  // Returns the single InterceptionAgent object for this process.
+  static InterceptionAgent* GetInterceptionAgent();
+
+  // This method should be invoked whenever a new dll is loaded to perform the
+  // required patches. If the return value is false, this dll should not be
+  // allowed to load.
+  //
+  // full_path is the (optional) full name of the module being loaded and name
+  // is the internal module name. If full_path is provided, it will be used
+  // before the internal name to determine if we care about this dll.
+  bool OnDllLoad(const UNICODE_STRING* full_path, const UNICODE_STRING* name,
+                 void* base_address);
+
+  // Performs cleanup when a dll is unloaded.
+  void OnDllUnload(void* base_address);
+
+ private:
+  ~InterceptionAgent() {}
+
+  // Performs initialization of the singleton.
+  bool Init(SharedMemory* shared_memory);
+
+  // Returns true if we are interested on this dll. dll_info is an entry of the
+  // list of intercepted dlls.
+  bool DllMatch(const UNICODE_STRING* full_path, const UNICODE_STRING* name,
+                const DllPatchInfo* dll_info);
+
+  // Performs the patching of the dll loaded at base_address.
+  // The patches to perform are described on dll_info, and thunks is the thunk
+  // storage for the whole dll.
+  // Returns true on success.
+  bool PatchDll(const DllPatchInfo* dll_info, DllInterceptionData* thunks);
+
+  // Returns a resolver for a given interception type.
+  ResolverThunk* GetResolver(InterceptionType type);
+
+  // Shared memory containing the list of functions to intercept.
+  SharedMemory* interceptions_;
+
+  // Array of thunk data buffers for the intercepted dlls. This object singleton
+  // is allocated with a placement new with enough space to hold the complete
+  // array of pointers, not just the first element.
+  DllInterceptionData* dlls_[1];
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(InterceptionAgent);
+};
+
+}  // namespace sandbox
+
+#endif  // SANDBOX_SRC_INTERCEPTION_AGENT_H__