From 1ae6db25e6c11cc22d308b96b6c50b225b91c5c7 Mon Sep 17 00:00:00 2001
From: Thomas Winget <tewinget@gmail.com>
Date: Wed, 17 Sep 2014 14:55:28 -0400
Subject: [PATCH] Initial commit of DNS code

---
 src/common/dns_utils.cpp | 55 +++++++++++++++++++++++++
 src/common/dns_utils.h   | 86 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 141 insertions(+)
 create mode 100644 src/common/dns_utils.cpp
 create mode 100644 src/common/dns_utils.h

diff --git a/src/common/dns_utils.cpp b/src/common/dns_utils.cpp
new file mode 100644
index 00000000..0bacc4d4
--- /dev/null
+++ b/src/common/dns_utils.cpp
@@ -0,0 +1,55 @@
+// Copyright (c) 2014, 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 "common/dns_utils.h"
+
+namespace tools
+{
+namespace dns
+{
+
+  std::vector<std::string> get_ipv4(const std::string& uri)
+  {
+    std::vector<std::string retval;
+    return retval;
+  }
+
+  std::vector<std::string> get_ipv6(const std::string& uri)
+  {
+    std::vector<std::string retval;
+    return retval;
+  }
+
+  std::string get_payment_address(const std::string& uri)
+  {
+    std::string retval;
+    return retval;
+  }
+
+}  // namespace dns
+}  // namespace tools
diff --git a/src/common/dns_utils.h b/src/common/dns_utils.h
new file mode 100644
index 00000000..2919100d
--- /dev/null
+++ b/src/common/dns_utils.h
@@ -0,0 +1,86 @@
+// Copyright (c) 2014, 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 <vector>
+#include <string>
+
+namespace tools
+{
+
+/**
+ * @brief Provides high-level access to DNS resolution
+ *
+ * This class is designed to provide a high-level abstraction to DNS resolution
+ * functionality, including access to TXT records and such.  It will also
+ * handle DNSSEC validation of the results.
+ */
+class DNSResolver
+{
+public:
+
+  /**
+   * @brief Constructs and sets the URI to be resolved
+   *
+   * @param uri the URI to be resolved
+   */
+  DNSResolver(const std::string& uri);
+
+  /**
+   * @brief gets ipv4 addresses from DNS query
+   *
+   * returns a vector of all IPv4 "A" records for given URI.
+   * If no "A" records found, returns an empty vector.
+   *
+   * @return vector of strings containing ipv4 addresses
+   */
+  std::vector<std::string> get_ipv4();
+
+  /**
+   * @brief gets ipv6 addresses from DNS query
+   *
+   * returns a vector of all IPv6 "A" records for given URI.
+   * If no "A" records found, returns an empty vector.
+   *
+   * @return vector of strings containing ipv6 addresses
+   */
+  std::vector<std::string> get_ipv6();
+
+  /**
+   * @brief gets a monero address from the TXT record of the DNS query response
+   *
+   * returns a monero address string from the TXT record associated with URI
+   * if no TXT record present, or no valid monero address in TXT,
+   * returns an empty string.
+   *
+   * @return 
+   */
+  std::string get_payment_address();
+
+}; // class DNSResolver
+
+}  // namespace tools