Add TLSA support to DNSSEC fetching

1 files changed, 71 insertions, 0 deletions

diff --git a/src/net/resolve.cpp b/src/net/resolve.cpp
new file mode 100644
index 000000000..1b43cf6c4
--- /dev/null
+++ b/src/net/resolve.cpp
@@ -0,0 +1,71 @@
+// Copyright (c) 2020, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "net/resolve.h"
+
+#include <boost/utility/string_ref.hpp>
+#include "common/dns_utils.h"
+#include "common/expect.h"
+#include "net/error.h"
+
+namespace net
+{
+namespace dnssec
+{
+  expect<service_response> resolve_hostname(const std::string& addr, const std::string& tlsa_port)
+  {
+    // use basic (blocking) unbound for now, possibly refactor later
+    tools::DNSResolver& resolver = tools::DNSResolver::instance();
+
+    bool dnssec_available = false;
+    bool dnssec_valid = false;
+    std::vector<std::string> ip_records = resolver.get_ipv4(addr, dnssec_available, dnssec_valid);
+
+    if (dnssec_available && !dnssec_valid)
+      return {net::error::bogus_dnssec};
+
+    if (ip_records.empty())
+    {
+      ip_records = resolver.get_ipv6(addr, dnssec_available, dnssec_valid);
+      if (dnssec_available && !dnssec_valid)
+        return {net::error::bogus_dnssec};
+      if (ip_records.empty())
+        return {net::error::dns_query_failure};
+    }
+
+    std::vector<std::string> tlsa{};
+    if (dnssec_available && !tlsa_port.empty())
+    {
+      tlsa = resolver.get_tlsa_tcp_record(addr, tlsa_port, dnssec_available, dnssec_valid);
+      if (!dnssec_valid)
+        return {net::error::bogus_dnssec};
+    }
+    return {{std::move(ip_records), std::move(tlsa)}};
+  }
+} // dnssec
+} // net