michael@0: // Copyright (c) 2006-2010 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "sandbox/win/src/resolver.h"
michael@0: 
michael@0: #include "base/win/pe_image.h"
michael@0: #include "sandbox/win/src/sandbox_nt_util.h"
michael@0: 
michael@0: namespace sandbox {
michael@0: 
michael@0: NTSTATUS ResolverThunk::Init(const void* target_module,
michael@0:                              const void* interceptor_module,
michael@0:                              const char* target_name,
michael@0:                              const char* interceptor_name,
michael@0:                              const void* interceptor_entry_point,
michael@0:                              void* thunk_storage,
michael@0:                              size_t storage_bytes) {
michael@0:   if (NULL == thunk_storage || 0 == storage_bytes ||
michael@0:       NULL == target_module || NULL == target_name)
michael@0:     return STATUS_INVALID_PARAMETER;
michael@0: 
michael@0:   if (storage_bytes < GetThunkSize())
michael@0:     return STATUS_BUFFER_TOO_SMALL;
michael@0: 
michael@0:   NTSTATUS ret = STATUS_SUCCESS;
michael@0:   if (NULL == interceptor_entry_point) {
michael@0:     ret = ResolveInterceptor(interceptor_module, interceptor_name,
michael@0:                              &interceptor_entry_point);
michael@0:     if (!NT_SUCCESS(ret))
michael@0:       return ret;
michael@0:   }
michael@0: 
michael@0:   ret = ResolveTarget(target_module, target_name, &target_);
michael@0:   if (!NT_SUCCESS(ret))
michael@0:     return ret;
michael@0: 
michael@0:   interceptor_ = interceptor_entry_point;
michael@0: 
michael@0:   return ret;
michael@0: }
michael@0: 
michael@0: NTSTATUS ResolverThunk::ResolveInterceptor(const void* interceptor_module,
michael@0:                                            const char* interceptor_name,
michael@0:                                            const void** address) {
michael@0:   DCHECK_NT(address);
michael@0:   if (!interceptor_module)
michael@0:     return STATUS_INVALID_PARAMETER;
michael@0: 
michael@0:   base::win::PEImage pe(interceptor_module);
michael@0:   if (!pe.VerifyMagic())
michael@0:     return STATUS_INVALID_IMAGE_FORMAT;
michael@0: 
michael@0:   *address = pe.GetProcAddress(interceptor_name);
michael@0: 
michael@0:   if (!(*address))
michael@0:     return STATUS_PROCEDURE_NOT_FOUND;
michael@0: 
michael@0:   return STATUS_SUCCESS;
michael@0: }
michael@0: 
michael@0: }  // namespace sandbox