tpm_manager: Implement GetStatus

BUG=brillo:1040
TEST=tpm_manager_client --status

Change-Id: I67322b6f2bd63743812c2b6edb7156471978f6d2
Reviewed-on: https://chromium-review.googlesource.com/292781
Commit-Ready: Utkarsh Sanghi <usanghi@chromium.org>
Tested-by: Utkarsh Sanghi <usanghi@chromium.org>
Reviewed-by: Darren Krahn <dkrahn@chromium.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/server/tpm_status_impl.h b/server/tpm_status_impl.h
new file mode 100644
index 0000000..ca38342
--- /dev/null
+++ b/server/tpm_status_impl.h
@@ -0,0 +1,58 @@
+// Copyright 2015 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TPM_MANAGER_SERVER_TPM_STATUS_IMPL_H_
+#define TPM_MANAGER_SERVER_TPM_STATUS_IMPL_H_
+
+#include "tpm_manager/server/tpm_status.h"
+
+#include <string>
+
+#include <base/macros.h>
+#include <trousers/scoped_tss_type.h>
+#include <trousers/tss.h>
+#include <trousers/trousers.h>  // NOLINT(build/include_alpha)
+
+namespace tpm_manager {
+
+class TpmStatusImpl : public TpmStatus {
+ public:
+  TpmStatusImpl() = default;
+  ~TpmStatusImpl() override = default;
+
+  // TpmState methods.
+  bool IsTpmEnabled() override;
+  bool IsTpmOwned() override;
+  bool GetDictionaryAttackInfo(int* counter,
+                               int* threshold,
+                               bool* lockout,
+                               int* seconds_remaining) override;
+
+ private:
+  // This method refreshes the |is_owned_| and |is_enabled_| status of the
+  // Tpm. It can be called multiple times.
+  void RefreshOwnedEnabledInfo();
+  // This method wraps calls to Tspi_TPM_GetCapability. |data| is set to
+  // the raw capability data. If the optional out argument |tpm_result| is
+  // provided, it is set to the result of the |Tspi_TPM_GetCapability| call.
+  bool GetCapability(uint32_t capability,
+                     uint32_t sub_capability,
+                     std::string* data,
+                     TSS_RESULT* tpm_result);
+  // This method tries to get a handle to the TPM. Returns 0 on failure.
+  TSS_HTPM GetTpm();
+  // This method connects to the Tpm. Returns true on success.
+  bool ConnectContext();
+
+  trousers::ScopedTssContext context_;
+  bool is_enabled_{false};
+  bool is_owned_{false};
+  bool is_enable_initialized_{false};
+
+  DISALLOW_COPY_AND_ASSIGN(TpmStatusImpl);
+};
+
+}  // namespace tpm_manager
+
+#endif  // TPM_MANAGER_SERVER_TPM_STATUS_IMPL_H_