security: Abstract certificate fetching from v2::Validator
Change-Id: Ia98d11ac67b0095f632818ac37a19a1e5a7656a8
Refs: #3921
diff --git a/src/security/v2/certificate-fetcher-from-network.cpp b/src/security/v2/certificate-fetcher-from-network.cpp
new file mode 100644
index 0000000..5d7bcaa
--- /dev/null
+++ b/src/security/v2/certificate-fetcher-from-network.cpp
@@ -0,0 +1,116 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "certificate-fetcher-from-network.hpp"
+#include "face.hpp"
+#include "util/logger.hpp"
+
+namespace ndn {
+namespace security {
+namespace v2 {
+
+NDN_LOG_INIT(ndn.security.v2.CertificateFetcher);
+
+#define NDN_LOG_DEBUG_DEPTH(x) NDN_LOG_DEBUG(std::string(state->getDepth() + 1, '>') << " " << x)
+#define NDN_LOG_TRACE_DEPTH(x) NDN_LOG_TRACE(std::string(state->getDepth() + 1, '>') << " " << x)
+
+CertificateFetcherFromNetwork::CertificateFetcherFromNetwork(Face& face)
+ : m_face(face)
+{
+}
+
+void
+CertificateFetcherFromNetwork::doFetch(const shared_ptr<CertificateRequest>& certRequest,
+ const shared_ptr<ValidationState>& state,
+ const ValidationContinuation& continueValidation)
+{
+ m_face.expressInterest(certRequest->m_interest,
+ [=] (const Interest& interest, const Data& data) {
+ dataCallback(data, certRequest, state, continueValidation);
+ },
+ [=] (const Interest& interest, const lp::Nack& nack) {
+ nackCallback(nack, certRequest, state, continueValidation);
+ },
+ [=] (const Interest& interest) {
+ timeoutCallback(certRequest, state, continueValidation);
+ });
+}
+
+void
+CertificateFetcherFromNetwork::dataCallback(const Data& data,
+ const shared_ptr<CertificateRequest>& certRequest,
+ const shared_ptr<ValidationState>& state,
+ const ValidationContinuation& continueValidation)
+{
+ NDN_LOG_DEBUG_DEPTH("Fetched certificate from network " << data.getName());
+
+ Certificate cert;
+ try {
+ cert = Certificate(data);
+ }
+ catch (const tlv::Error& e) {
+ return state->fail({ValidationError::Code::MALFORMED_CERT, "Fetched a malformed certificate "
+ "`" + data.getName().toUri() + "` (" + e.what() + ")"});
+ }
+ continueValidation(cert, state);
+}
+
+void
+CertificateFetcherFromNetwork::nackCallback(const lp::Nack& nack,
+ const shared_ptr<CertificateRequest>& certRequest,
+ const shared_ptr<ValidationState>& state,
+ const ValidationContinuation& continueValidation)
+{
+ NDN_LOG_DEBUG_DEPTH("NACK (" << nack.getReason() << ") while fetching certificate "
+ << certRequest->m_interest.getName());
+
+ --certRequest->m_nRetriesLeft;
+ if (certRequest->m_nRetriesLeft >= 0) {
+ // TODO implement delay for the the next fetch
+ fetch(certRequest, state, continueValidation);
+ }
+ else {
+ state->fail({ValidationError::Code::CANNOT_RETRIEVE_CERT, "Cannot fetch certificate after all "
+ "retries `" + certRequest->m_interest.getName().toUri() + "`"});
+ }
+}
+
+void
+CertificateFetcherFromNetwork::timeoutCallback(const shared_ptr<CertificateRequest>& certRequest,
+ const shared_ptr<ValidationState>& state,
+ const ValidationContinuation& continueValidation)
+{
+ NDN_LOG_DEBUG_DEPTH("Timeout while fetching certificate " << certRequest->m_interest.getName()
+ << ", retrying");
+
+ --certRequest->m_nRetriesLeft;
+ if (certRequest->m_nRetriesLeft >= 0) {
+ fetch(certRequest, state, continueValidation);
+ }
+ else {
+ state->fail({ValidationError::Code::CANNOT_RETRIEVE_CERT, "Cannot fetch certificate after all "
+ "retries `" + certRequest->m_interest.getName().toUri() + "`"});
+ }
+}
+
+} // namespace v2
+} // namespace security
+} // namespace ndn