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net: Add libnatpmp support

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Hennadii Stepanov
2020-02-23 01:34:13 +02:00
parent 58e8364dcd
commit a8d9f275d0
14 changed files with 195 additions and 13 deletions
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116
src/mapport.cpp
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@@ -16,6 +16,11 @@
#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>
@@ -23,7 +28,7 @@
// 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
#endif // USE_UPNP
#include <atomic>
#include <cassert>
@@ -32,7 +37,7 @@ static_assert(MINIUPNPC_API_VERSION >= 10, "miniUPnPc API version >= 10 assumed"
#include <string>
#include <thread>
#ifdef USE_UPNP
#if defined(USE_NATPMP) || defined(USE_UPNP)
static CThreadInterrupt g_mapport_interrupt;
static std::thread g_mapport_thread;
static std::atomic_uint g_mapport_target_proto{MapPortProtoFlag::NONE};
@@ -41,6 +46,106 @@ 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;
@@ -111,6 +216,7 @@ static bool ProcessUpnp()
return ret;
}
#endif // USE_UPNP
static void ThreadMapPort()
{
@@ -123,7 +229,7 @@ void StartThreadMapPort()
{
if (!g_mapport_thread.joinable()) {
assert(!g_mapport_interrupt);
g_mapport_thread = std::thread((std::bind(&TraceThread<void (*)()>, "mapport", &ThreadMapPort)));
g_mapport_thread = std::thread(std::bind(&TraceThread<void (*)()>, "mapport", &ThreadMapPort));
}
}
@@ -167,7 +273,7 @@ void StopMapPort()
}
}
#else
#else // #if defined(USE_NATPMP) || defined(USE_UPNP)
void StartMapPort(bool use_upnp)
{
// Intentionally left blank.
@@ -180,4 +286,4 @@ void StopMapPort()
{
// Intentionally left blank.
}
#endif
#endif // #if defined(USE_NATPMP) || defined(USE_UPNP)