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dash/src/mapport.cpp

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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/dash-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_NATPMP
#include <compat.h>
#include <natpmp.h>
#endif // USE_NATPMP
#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 // USE_UPNP
#include <atomic>
#include <cassert>
#include <chrono>
#include <functional>
#include <string>
#include <thread>
#if defined(USE_NATPMP) || defined(USE_UPNP)
static CThreadInterrupt g_mapport_interrupt;
static std::thread g_mapport_thread;
static std::atomic_uint g_mapport_enabled_protos{MapPortProtoFlag::NONE};
static std::atomic<MapPortProtoFlag> g_mapport_current_proto{MapPortProtoFlag::NONE};
using namespace std::chrono_literals;
static constexpr auto PORT_MAPPING_REANNOUNCE_PERIOD{20min};
static constexpr auto PORT_MAPPING_RETRY_PERIOD{5min};
#ifdef USE_NATPMP
static uint16_t g_mapport_external_port = 0;
static bool NatpmpInit(natpmp_t* natpmp)
{
const int r_init = initnatpmp(natpmp, /* detect gateway automatically */ 0, /* forced gateway - NOT APPLIED*/ 0);
if (r_init == 0) return true;
LogPrintf("natpmp: initnatpmp() failed with %d error.\n", r_init);
return false;
}
static bool NatpmpDiscover(natpmp_t* natpmp, struct in_addr& external_ipv4_addr)
{
const int r_send = sendpublicaddressrequest(natpmp);
if (r_send == 2 /* OK */) {
int r_read;
natpmpresp_t response;
do {
r_read = readnatpmpresponseorretry(natpmp, &response);
} while (r_read == NATPMP_TRYAGAIN);
if (r_read == 0) {
external_ipv4_addr = response.pnu.publicaddress.addr;
return true;
} else if (r_read == NATPMP_ERR_NOGATEWAYSUPPORT) {
LogPrintf("natpmp: The gateway does not support NAT-PMP.\n");
} else {
LogPrintf("natpmp: readnatpmpresponseorretry() for public address failed with %d error.\n", r_read);
}
} else {
LogPrintf("natpmp: sendpublicaddressrequest() failed with %d error.\n", r_send);
}
return false;
}
static bool NatpmpMapping(natpmp_t* natpmp, const struct in_addr& external_ipv4_addr, uint16_t private_port, bool& external_ip_discovered)
{
const uint16_t suggested_external_port = g_mapport_external_port ? g_mapport_external_port : private_port;
const int r_send = sendnewportmappingrequest(natpmp, NATPMP_PROTOCOL_TCP, private_port, suggested_external_port, 3600 /*seconds*/);
if (r_send == 12 /* OK */) {
int r_read;
natpmpresp_t response;
do {
r_read = readnatpmpresponseorretry(natpmp, &response);
} while (r_read == NATPMP_TRYAGAIN);
if (r_read == 0) {
auto pm = response.pnu.newportmapping;
if (private_port == pm.privateport && pm.lifetime > 0) {
g_mapport_external_port = pm.mappedpublicport;
const CService external{external_ipv4_addr, pm.mappedpublicport};
if (!external_ip_discovered && fDiscover) {
AddLocal(external, LOCAL_MAPPED);
external_ip_discovered = true;
}
LogPrintf("natpmp: Port mapping successful. External address = %s\n", external.ToString());
return true;
} else {
LogPrintf("natpmp: Port mapping failed.\n");
}
} else if (r_read == NATPMP_ERR_NOGATEWAYSUPPORT) {
LogPrintf("natpmp: The gateway does not support NAT-PMP.\n");
} else {
LogPrintf("natpmp: readnatpmpresponseorretry() for port mapping failed with %d error.\n", r_read);
}
} else {
LogPrintf("natpmp: sendnewportmappingrequest() failed with %d error.\n", r_send);
}
return false;
}
static bool ProcessNatpmp()
{
bool ret = false;
natpmp_t natpmp;
struct in_addr external_ipv4_addr;
if (NatpmpInit(&natpmp) && NatpmpDiscover(&natpmp, external_ipv4_addr)) {
bool external_ip_discovered = false;
const uint16_t private_port = GetListenPort();
do {
ret = NatpmpMapping(&natpmp, external_ipv4_addr, private_port, external_ip_discovered);
} while (ret && g_mapport_interrupt.sleep_for(PORT_MAPPING_REANNOUNCE_PERIOD));
g_mapport_interrupt.reset();
const int r_send = sendnewportmappingrequest(&natpmp, NATPMP_PROTOCOL_TCP, private_port, g_mapport_external_port, /* remove a port mapping */ 0);
g_mapport_external_port = 0;
if (r_send == 12 /* OK */) {
LogPrintf("natpmp: Port mapping removed successfully.\n");
} else {
LogPrintf("natpmp: sendnewportmappingrequest(0) failed with %d error.\n", r_send);
}
}
closenatpmp(&natpmp);
return ret;
}
#endif // USE_NATPMP
#ifdef USE_UPNP
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;
}
#endif // USE_UPNP
static void ThreadMapPort()
{
bool ok;
do {
ok = false;
#ifdef USE_UPNP
// High priority protocol.
if (g_mapport_enabled_protos & MapPortProtoFlag::UPNP) {
g_mapport_current_proto = MapPortProtoFlag::UPNP;
ok = ProcessUpnp();
if (ok) continue;
}
#endif // USE_UPNP
#ifdef USE_NATPMP
// Low priority protocol.
if (g_mapport_enabled_protos & MapPortProtoFlag::NAT_PMP) {
g_mapport_current_proto = MapPortProtoFlag::NAT_PMP;
ok = ProcessNatpmp();
if (ok) continue;
}
#endif // USE_NATPMP
g_mapport_current_proto = MapPortProtoFlag::NONE;
if (g_mapport_enabled_protos == MapPortProtoFlag::NONE) {
return;
}
} while (ok || 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_current_proto == MapPortProtoFlag::NONE && g_mapport_enabled_protos == MapPortProtoFlag::NONE) {
return;
}
if (g_mapport_current_proto == MapPortProtoFlag::NONE && g_mapport_enabled_protos != MapPortProtoFlag::NONE) {
StartThreadMapPort();
return;
}
if (g_mapport_current_proto != MapPortProtoFlag::NONE && g_mapport_enabled_protos == MapPortProtoFlag::NONE) {
InterruptMapPort();
StopMapPort();
return;
}
if (g_mapport_enabled_protos & g_mapport_current_proto) {
// Enabling another protocol does not cause switching from the currently used one.
return;
}
assert(g_mapport_thread.joinable());
assert(!g_mapport_interrupt);
// Interrupt a protocol-specific loop in the ThreadUpnp() or in the ThreadNatpmp()
// to force trying the next protocol in the ThreadMapPort() loop.
g_mapport_interrupt();
}
static void MapPortProtoSetEnabled(MapPortProtoFlag proto, bool enabled)
{
if (enabled) {
g_mapport_enabled_protos |= proto;
} else {
g_mapport_enabled_protos &= ~proto;
}
}
void StartMapPort(bool use_upnp, bool use_natpmp)
{
MapPortProtoSetEnabled(MapPortProtoFlag::UPNP, use_upnp);
MapPortProtoSetEnabled(MapPortProtoFlag::NAT_PMP, use_natpmp);
DispatchMapPort();
}
void InterruptMapPort()
{
g_mapport_enabled_protos = MapPortProtoFlag::NONE;
if (g_mapport_thread.joinable()) {
g_mapport_interrupt();
}
}
void StopMapPort()
{
if (g_mapport_thread.joinable()) {
g_mapport_thread.join();
g_mapport_interrupt.reset();
}
}
#else // #if defined(USE_NATPMP) || defined(USE_UPNP)
void StartMapPort(bool use_upnp, bool use_natpmp)
{
// Intentionally left blank.
}
void InterruptMapPort()
{
// Intentionally left blank.
}
void StopMapPort()
{
// Intentionally left blank.
}
#endif // #if defined(USE_NATPMP) || defined(USE_UPNP)
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