core: updates can now be downloaded (and SHA256 hash checked)

1 files changed, 138 insertions, 0 deletions

diff --git a/src/common/download.cpp b/src/common/download.cpp
new file mode 100644
index 000000000..c5ee797d0
--- /dev/null
+++ b/src/common/download.cpp
@@ -0,0 +1,138 @@
+// Copyright (c) 2017, 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 <string>
+#include <boost/filesystem.hpp>
+#include <boost/asio.hpp>
+#include <boost/thread/thread.hpp>
+#include "cryptonote_config.h"
+#include "include_base_utils.h"
+#include "net/http_client.h"
+#include "download.h"
+
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "net.dl"
+
+namespace tools
+{
+  static bool download_thread(const std::string &path, const std::string &url)
+  {
+    try
+    {
+      MINFO("Downloading " << url << " to " << path);
+      std::ofstream f;
+      f.open(path, std::ios_base::binary | std::ios_base::out | std::ios_base::trunc);
+      if (!f.good()) {
+        MERROR("Failed to open file " << path);
+        return false;
+      }
+      class download_client: public epee::net_utils::http::http_simple_client
+      {
+      public:
+        download_client(std::ofstream &f): f(f) {}
+        virtual ~download_client() { f.close(); }
+        virtual bool handle_target_data(std::string &piece_of_transfer)
+        {
+          try
+          {
+            f << piece_of_transfer;
+            return f.good();
+          }
+          catch (const std::exception &e)
+          {
+            MERROR("Error writing data: " << e.what());
+            return false;
+          }
+        }
+      private:
+        std::ofstream &f;
+      } client(f);
+      epee::net_utils::http::url_content u_c;
+      if (!epee::net_utils::parse_url(url, u_c))
+      {
+        MWARNING("Failed to parse URL " << url);
+        return false;
+      }
+      if (u_c.host.empty())
+      {
+        MWARNING("Failed to determine address from URL " << url);
+        return false;
+      }
+      uint16_t port = u_c.port ? u_c.port : 80;
+      MDEBUG("Connecting to " << u_c.host << ":" << port);
+      client.set_server(u_c.host, std::to_string(port), boost::none);
+      if (!client.connect(std::chrono::seconds(30)))
+      {
+        MERROR("Failed to connect to " << url);
+        return false;
+      }
+      MDEBUG("GETting " << u_c.uri);
+      const epee::net_utils::http::http_response_info *info = NULL;
+      if (!client.invoke_get(u_c.uri, std::chrono::seconds(30), "", &info))
+      {
+        MERROR("Failed to connect to " << url);
+        client.disconnect();
+        return false;
+      }
+      if (!info)
+      {
+        MERROR("Failed invoking GET command to " << url << ", no status info returned");
+        client.disconnect();
+        return false;
+      }
+      MDEBUG("response code: " << info->m_response_code);
+      MDEBUG("response comment: " << info->m_response_comment);
+      MDEBUG("response body: " << info->m_body);
+      for (const auto &f: info->m_additional_fields)
+        MDEBUG("additional field: " << f.first << ": " << f.second);
+      if (info->m_response_code != 200)
+      {
+        MERROR("Status code " << info->m_response_code);
+        client.disconnect();
+        return false;
+      }
+      client.disconnect();
+      f.close();
+      MDEBUG("Download complete");
+      return true;
+    }
+    catch (const std::exception &e)
+    {
+      MERROR("Exception in download thread: " << e.what());
+      return false;
+    }
+  }
+
+  bool download(const std::string &path, const std::string &url)
+  {
+    bool success;
+    std::unique_ptr<boost::thread> thread(new boost::thread([&](){ success = download_thread(path, url); }));
+    thread->join();
+    return success;
+  }
+}