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// 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 <atomic>
#include <cassert>
#include <chrono>
#include <functional>
#include <string>
#include <thread>
#ifdef USE_UPNP
static CThreadInterrupt g_mapport_interrupt;
static std::thread g_mapport_thread;
static std::atomic_uint g_mapport_target_proto{MapPortProtoFlag::NONE};
using namespace std::chrono_literals;
static constexpr auto PORT_MAPPING_REANNOUNCE_PERIOD{20min};
static constexpr auto PORT_MAPPING_RETRY_PERIOD{5min};
static bool ProcessUpnp()
{
bool ret = false;
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_MAPPED);
}
} 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) {
ret = false;
LogPrintf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n", port, port, lanaddr, r, strupnperror(r));
break;
} else {
ret = true;
LogPrintf("UPnP Port Mapping successful.\n");
}
} while (g_mapport_interrupt.sleep_for(PORT_MAPPING_REANNOUNCE_PERIOD));
g_mapport_interrupt.reset();
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);
}
return ret;
}
static void ThreadMapPort()
{
do {
if (ProcessUpnp()) return;
} while (g_mapport_interrupt.sleep_for(PORT_MAPPING_RETRY_PERIOD));
}
void StartThreadMapPort()
{
if (!g_mapport_thread.joinable()) {
assert(!g_mapport_interrupt);
g_mapport_thread = std::thread((std::bind(&TraceThread<void (*)()>, "mapport", &ThreadMapPort)));
}
}
static void DispatchMapPort()
{
if (g_mapport_target_proto == MapPortProtoFlag::UPNP) {
StartThreadMapPort();
} else {
InterruptMapPort();
StopMapPort();
}
}
static void MapPortProtoSetEnabled(MapPortProtoFlag proto, bool enabled)
{
if (enabled) {
g_mapport_target_proto |= proto;
} else {
g_mapport_target_proto &= ~proto;
}
}
void StartMapPort(bool use_upnp)
{
MapPortProtoSetEnabled(MapPortProtoFlag::UPNP, use_upnp);
DispatchMapPort();
}
void InterruptMapPort()
{
if (g_mapport_thread.joinable()) {
g_mapport_interrupt();
}
}
void StopMapPort()
{
if (g_mapport_thread.joinable()) {
g_mapport_thread.join();
g_mapport_interrupt.reset();
}
}
#else
void StartMapPort(bool use_upnp)
{
// Intentionally left blank.
}
void InterruptMapPort()
{
// Intentionally left blank.
}
void StopMapPort()
{
// Intentionally left blank.
}
#endif
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