Index: sandbox/win/src/resolver.h |
diff --git a/sandbox/win/src/resolver.h b/sandbox/win/src/resolver.h |
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-// Copyright (c) 2010 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 ResolverThunk, the interface for classes that perform interceptions. |
-// For more details see |
-// http://dev.chromium.org/developers/design-documents/sandbox . |
- |
-#include <stddef.h> |
- |
-#include "base/macros.h" |
-#include "sandbox/win/src/nt_internals.h" |
- |
-#ifndef SANDBOX_SRC_RESOLVER_H__ |
-#define SANDBOX_SRC_RESOLVER_H__ |
- |
-namespace sandbox { |
- |
-// A resolver is the object in charge of performing the actual interception of |
-// a function. There should be a concrete implementation of a resolver roughly |
-// per type of interception. |
-class ResolverThunk { |
- public: |
- ResolverThunk() {} |
- virtual ~ResolverThunk() {} |
- |
- // Performs the actual interception of a function. |
- // target_name is an exported function from the module loaded at |
- // target_module, and must be replaced by interceptor_name, exported from |
- // interceptor_module. interceptor_entry_point can be provided instead of |
- // interceptor_name / interceptor_module. |
- // thunk_storage must point to a buffer on the child's address space, to hold |
- // the patch thunk, and related data. If provided, storage_used will receive |
- // the number of bytes used from thunk_storage. |
- // |
- // Example: (without error checking) |
- // |
- // size_t size = resolver.GetThunkSize(); |
- // char* buffer = ::VirtualAllocEx(child_process, NULL, size, |
- // MEM_COMMIT, PAGE_READWRITE); |
- // resolver.Setup(ntdll_module, NULL, L"NtCreateFile", NULL, |
- // &MyReplacementFunction, buffer, size, NULL); |
- // |
- // In general, the idea is to allocate a single big buffer for all |
- // interceptions on the same dll, and call Setup n times. |
- // WARNING: This means that any data member that is specific to a single |
- // interception must be reset within this method. |
- virtual NTSTATUS Setup(const void* target_module, |
- const void* interceptor_module, |
- const char* target_name, |
- const char* interceptor_name, |
- const void* interceptor_entry_point, |
- void* thunk_storage, |
- size_t storage_bytes, |
- size_t* storage_used) = 0; |
- |
- // Gets the address of function_name inside module (main exe). |
- virtual NTSTATUS ResolveInterceptor(const void* module, |
- const char* function_name, |
- const void** address); |
- |
- // Gets the address of an exported function_name inside module. |
- virtual NTSTATUS ResolveTarget(const void* module, |
- const char* function_name, |
- void** address); |
- |
- // Gets the required buffer size for this type of thunk. |
- virtual size_t GetThunkSize() const = 0; |
- |
- protected: |
- // Performs basic initialization on behalf of a concrete instance of a |
- // resolver. That is, parameter validation and resolution of the target |
- // and the interceptor into the member variables. |
- // |
- // target_name is an exported function from the module loaded at |
- // target_module, and must be replaced by interceptor_name, exported from |
- // interceptor_module. interceptor_entry_point can be provided instead of |
- // interceptor_name / interceptor_module. |
- // thunk_storage must point to a buffer on the child's address space, to hold |
- // the patch thunk, and related data. |
- virtual NTSTATUS Init(const void* target_module, |
- const void* interceptor_module, |
- const char* target_name, |
- const char* interceptor_name, |
- const void* interceptor_entry_point, |
- void* thunk_storage, |
- size_t storage_bytes); |
- |
- // Gets the required buffer size for the internal part of the thunk. |
- size_t GetInternalThunkSize() const; |
- |
- // Initializes the internal part of the thunk. |
- // interceptor is the function to be called instead of original_function. |
- bool SetInternalThunk(void* storage, size_t storage_bytes, |
- const void* original_function, const void* interceptor); |
- |
- // Holds the resolved interception target. |
- void* target_; |
- // Holds the resolved interception interceptor. |
- const void* interceptor_; |
- |
- DISALLOW_COPY_AND_ASSIGN(ResolverThunk); |
-}; |
- |
-} // namespace sandbox |
- |
-#endif // SANDBOX_SRC_RESOLVER_H__ |