refactor: Move port mapping code to its own module

This commit does not change behavior.

1 files changed, 137 insertions, 0 deletions

diff --git a/src/mapport.cpp b/src/mapport.cpp
new file mode 100644
index 0000000000..a45d4d9060
--- /dev/null
+++ b/src/mapport.cpp
@@ -0,0 +1,137 @@
+// Copyright (c) 2011-2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#include <mapport.h>
+
+#include <clientversion.h>
+#include <logging.h>
+#include <net.h>
+#include <netaddress.h>
+#include <netbase.h>
+#include <threadinterrupt.h>
+#include <util/system.h>
+
+#ifdef USE_UPNP
+#include <miniupnpc/miniupnpc.h>
+#include <miniupnpc/upnpcommands.h>
+#include <miniupnpc/upnperrors.h>
+// The minimum supported miniUPnPc API version is set to 10. This keeps compatibility
+// with Ubuntu 16.04 LTS and Debian 8 libminiupnpc-dev packages.
+static_assert(MINIUPNPC_API_VERSION >= 10, "miniUPnPc API version >= 10 assumed");
+#endif
+
+#include <cassert>
+#include <chrono>
+#include <functional>
+#include <string>
+#include <thread>
+
+#ifdef USE_UPNP
+static CThreadInterrupt g_upnp_interrupt;
+static std::thread g_upnp_thread;
+static void ThreadMapPort()
+{
+    std::string port = strprintf("%u", GetListenPort());
+    const char * multicastif = nullptr;
+    const char * minissdpdpath = nullptr;
+    struct UPNPDev * devlist = nullptr;
+    char lanaddr[64];
+
+    int error = 0;
+#if MINIUPNPC_API_VERSION < 14
+    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
+#else
+    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, 2, &error);
+#endif
+
+    struct UPNPUrls urls;
+    struct IGDdatas data;
+    int r;
+
+    r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
+    if (r == 1)
+    {
+        if (fDiscover) {
+            char externalIPAddress[40];
+            r = UPNP_GetExternalIPAddress(urls.controlURL, data.first.servicetype, externalIPAddress);
+            if (r != UPNPCOMMAND_SUCCESS) {
+                LogPrintf("UPnP: GetExternalIPAddress() returned %d\n", r);
+            } else {
+                if (externalIPAddress[0]) {
+                    CNetAddr resolved;
+                    if (LookupHost(externalIPAddress, resolved, false)) {
+                        LogPrintf("UPnP: ExternalIPAddress = %s\n", resolved.ToString());
+                        AddLocal(resolved, LOCAL_UPNP);
+                    }
+                } else {
+                    LogPrintf("UPnP: GetExternalIPAddress failed.\n");
+                }
+            }
+        }
+
+        std::string strDesc = PACKAGE_NAME " " + FormatFullVersion();
+
+        do {
+            r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype, port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0, "0");
+
+            if (r != UPNPCOMMAND_SUCCESS) {
+                LogPrintf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n", port, port, lanaddr, r, strupnperror(r));
+            } else {
+                LogPrintf("UPnP Port Mapping successful.\n");
+            }
+        } while (g_upnp_interrupt.sleep_for(std::chrono::minutes(20)));
+
+        r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port.c_str(), "TCP", 0);
+        LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
+        freeUPNPDevlist(devlist); devlist = nullptr;
+        FreeUPNPUrls(&urls);
+    } else {
+        LogPrintf("No valid UPnP IGDs found\n");
+        freeUPNPDevlist(devlist); devlist = nullptr;
+        if (r != 0)
+            FreeUPNPUrls(&urls);
+    }
+}
+
+void StartMapPort()
+{
+    if (!g_upnp_thread.joinable()) {
+        assert(!g_upnp_interrupt);
+        g_upnp_thread = std::thread((std::bind(&TraceThread<void (*)()>, "upnp", &ThreadMapPort)));
+    }
+}
+
+void InterruptMapPort()
+{
+    if(g_upnp_thread.joinable()) {
+        g_upnp_interrupt();
+    }
+}
+
+void StopMapPort()
+{
+    if(g_upnp_thread.joinable()) {
+        g_upnp_thread.join();
+        g_upnp_interrupt.reset();
+    }
+}
+
+#else
+void StartMapPort()
+{
+    // Intentionally left blank.
+}
+void InterruptMapPort()
+{
+    // Intentionally left blank.
+}
+void StopMapPort()
+{
+    // Intentionally left blank.
+}
+#endif