1 files changed, 52 insertions, 0 deletions
diff --git a/dnsdist-resolver.cc b/dnsdist-resolver.cc
new file mode 100644
index 0000000..8e3417d
--- /dev/null
+++ b/dnsdist-resolver.cc
@@ -0,0 +1,52 @@
+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <vector>
+
+#include "dnsdist-resolver.hh"
+#include "iputils.hh"
+
+namespace dnsdist::resolver
+{
+void asynchronousResolver(const std::string& hostname, const std::function<void(const std::string& hostname, std::vector<ComboAddress>& ips)>& callback)
+{
+  addrinfo hints{};
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_flags = AI_ADDRCONFIG;
+  hints.ai_socktype = SOCK_DGRAM;
+  addrinfo* infosRaw{nullptr};
+  std::vector<ComboAddress> addresses;
+  auto ret = getaddrinfo(hostname.c_str(), nullptr, &hints, &infosRaw);
+  if (ret != 0) {
+    callback(hostname, addresses);
+    return;
+  }
+  auto infos = std::unique_ptr<addrinfo, decltype(&freeaddrinfo)>(infosRaw, &freeaddrinfo);
+  for (const auto* addr = infos.get(); addr != nullptr; addr = addr->ai_next) {
+    try {
+      addresses.emplace_back(addr->ai_addr, addr->ai_addrlen);
+    }
+    catch (...) {
+    }
+  }
+  callback(hostname, addresses);
+}
+}