Common: extract UPnP namespace from NetPlayServer

Source/Core/Common/UPnP.cpp

@@ -0,0 +1,173 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#ifdef USE_UPNP
+
+#include "Common/UPnP.h"
+
+#include "Common/Logging/Log.h"
+#include "Common/StringUtil.h"
+
+#include <cstring>
+#include <miniupnpc.h>
+#include <miniwget.h>
+#include <string>
+#include <thread>
+#include <upnpcommands.h>
+
+static struct UPNPUrls m_upnp_urls;
+static struct IGDdatas m_upnp_data;
+static std::string m_upnp_ourip;
+static u16 m_upnp_mapped = 0;
+static std::thread m_upnp_thread;
+
+// called from ---UPnP--- thread
+// discovers the IGD
+static bool initUPnP()
+{
+  static bool s_inited = false;
+  static bool s_error = false;
+
+  std::vector<UPNPDev*> igds;
+  int descXMLsize = 0, upnperror = 0;
+  char cIP[20];
+
+  // Don't init if already inited
+  if (s_inited)
+    return true;
+
+  // Don't init if it failed before
+  if (s_error)
+    return false;
+
+  std::memset(&m_upnp_urls, 0, sizeof(UPNPUrls));
+  std::memset(&m_upnp_data, 0, sizeof(IGDdatas));
+
+  // Find all UPnP devices
+  std::unique_ptr<UPNPDev, decltype(&freeUPNPDevlist)> devlist(nullptr, freeUPNPDevlist);
+#if MINIUPNPC_API_VERSION >= 14
+  devlist.reset(upnpDiscover(2000, nullptr, nullptr, 0, 0, 2, &upnperror));
+#else
+  devlist.reset(upnpDiscover(2000, nullptr, nullptr, 0, 0, &upnperror));
+#endif
+  if (!devlist)
+  {
+    WARN_LOG(NETPLAY, "An error occurred trying to discover UPnP devices.");
+
+    s_error = true;
+
+    return false;
+  }
+
+  // Look for the IGD
+  for (UPNPDev* dev = devlist.get(); dev; dev = dev->pNext)
+  {
+    if (std::strstr(dev->st, "InternetGatewayDevice"))
+      igds.push_back(dev);
+  }
+
+  for (const UPNPDev* dev : igds)
+  {
+    std::unique_ptr<char, decltype(&std::free)> descXML(nullptr, std::free);
+    int statusCode = 200;
+#if MINIUPNPC_API_VERSION >= 16
+    descXML.reset(static_cast<char*>(
+        miniwget_getaddr(dev->descURL, &descXMLsize, cIP, sizeof(cIP), 0, &statusCode)));
+#else
+    descXML.reset(
+        static_cast<char*>(miniwget_getaddr(dev->descURL, &descXMLsize, cIP, sizeof(cIP), 0)));
+#endif
+    if (descXML && statusCode == 200)
+    {
+      parserootdesc(descXML.get(), descXMLsize, &m_upnp_data);
+      GetUPNPUrls(&m_upnp_urls, &m_upnp_data, dev->descURL, 0);
+
+      m_upnp_ourip = cIP;
+
+      NOTICE_LOG(NETPLAY, "Got info from IGD at %s.", dev->descURL);
+      break;
+    }
+    else
+    {
+      WARN_LOG(NETPLAY, "Error getting info from IGD at %s.", dev->descURL);
+    }
+  }
+
+  s_inited = true;
+
+  return true;
+}
+
+// called from ---UPnP--- thread
+// Attempt to stop portforwarding.
+// --
+// NOTE: It is important that this happens! A few very crappy routers
+// apparently do not delete UPnP mappings on their own, so if you leave them
+// hanging, the NVRAM will fill with portmappings, and eventually all UPnP
+// requests will fail silently, with the only recourse being a factory reset.
+// --
+static bool UPnPUnmapPort(const u16 port)
+{
+  std::string port_str = StringFromFormat("%d", port);
+  UPNP_DeletePortMapping(m_upnp_urls.controlURL, m_upnp_data.first.servicetype, port_str.c_str(),
+                         "UDP", nullptr);
+
+  return true;
+}
+
+// called from ---UPnP--- thread
+// Attempt to portforward!
+static bool UPnPMapPort(const std::string& addr, const u16 port)
+{
+  if (m_upnp_mapped > 0)
+    UPnPUnmapPort(m_upnp_mapped);
+
+  std::string port_str = StringFromFormat("%d", port);
+  int result = UPNP_AddPortMapping(
+      m_upnp_urls.controlURL, m_upnp_data.first.servicetype, port_str.c_str(), port_str.c_str(),
+      addr.c_str(), (std::string("dolphin-emu UDP on ") + addr).c_str(), "UDP", nullptr, nullptr);
+
+  if (result != 0)
+    return false;
+
+  m_upnp_mapped = port;
+
+  return true;
+}
+
+// UPnP thread: try to map a port
+static void mapPortThread(const u16 port)
+{
+  if (initUPnP() && UPnPMapPort(m_upnp_ourip, port))
+  {
+    NOTICE_LOG(NETPLAY, "Successfully mapped port %d to %s.", port, m_upnp_ourip.c_str());
+    return;
+  }
+
+  WARN_LOG(NETPLAY, "Failed to map port %d to %s.", port, m_upnp_ourip.c_str());
+}
+
+// UPnP thread: try to unmap a port
+static void unmapPortThread()
+{
+  if (m_upnp_mapped > 0)
+    UPnPUnmapPort(m_upnp_mapped);
+}
+
+void UPnP::TryPortmapping(u16 port)
+{
+  if (m_upnp_thread.joinable())
+    m_upnp_thread.join();
+  m_upnp_thread = std::thread(&mapPortThread, port);
+}
+
+void UPnP::StopPortmapping()
+{
+  if (m_upnp_thread.joinable())
+    m_upnp_thread.join();
+  m_upnp_thread = std::thread(&unmapPortThread);
+  m_upnp_thread.join();
+}
+
+#endif