premiere-libtorrent/src/natpmp.cpp

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/*
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Copyright (c) 2007-2018, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
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#include "libtorrent/config.hpp"
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#if defined TORRENT_OS2
#include <pthread.h>
#endif
#include <boost/asio/ip/host_name.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
#include <cstdio> // for snprintf
#include <cinttypes> // for PRId64 et.al.
#include <cstdarg>
#include <functional>
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#include <cstring> // for memcpy
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#include "libtorrent/natpmp.hpp"
#include "libtorrent/io.hpp"
#include "libtorrent/assert.hpp"
#include "libtorrent/enum_net.hpp"
#include "libtorrent/socket_io.hpp"
#include "libtorrent/io_service.hpp"
#include "libtorrent/aux_/time.hpp"
#include "libtorrent/debug.hpp"
#include "libtorrent/random.hpp"
#include "libtorrent/broadcast_socket.hpp" // for is_local
#include "libtorrent/aux_/escape_string.hpp"
#include "libtorrent/aux_/numeric_cast.hpp"
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namespace libtorrent {
struct pcp_error_category final : boost::system::error_category
{
const char* name() const BOOST_SYSTEM_NOEXCEPT override
{ return "pcp error"; }
std::string message(int ev) const override
{
static char const* msgs[] =
{
"success",
"unsupported version",
"not authorized",
"malformed request",
"unsupported opcode",
"unsupported option",
"malformed option",
"network failure",
"no resources",
"unsupported protocol",
"user exceeded quota",
"cannot provide external",
"address mismatch",
"excessive remote peers",
};
if (ev < 0 || ev >= int(sizeof(msgs)/sizeof(msgs[0])))
return "Unknown error";
return msgs[ev];
}
boost::system::error_condition default_error_condition(
int ev) const BOOST_SYSTEM_NOEXCEPT override
{ return boost::system::error_condition(ev, *this); }
};
boost::system::error_category& pcp_category()
{
static pcp_error_category pcp_category;
return pcp_category;
}
namespace errors
{
// hidden
boost::system::error_code make_error_code(pcp_errors e)
{
return boost::system::error_code(e, pcp_category());
}
}
error_code natpmp::from_result_code(int const version, int result)
{
if (version == version_natpmp)
{
// a few nat-pmp result codes map to different codes
// in pcp
switch (result)
{
case 3:result = 7; break;
case 4:result = 8; break;
case 5:result = 4; break;
}
}
return errors::pcp_errors(result);
}
char const* natpmp::version_to_string(protocol_version version)
{
return version == version_natpmp ? "NAT-PMP" : "PCP";
}
using namespace aux;
using namespace std::placeholders;
natpmp::natpmp(io_service& ios
, aux::portmap_callback& cb)
: m_callback(cb)
, m_socket(ios)
, m_send_timer(ios)
, m_refresh_timer(ios)
{
// unfortunately async operations rely on the storage
// for this array not to be reallocated, by passing
// around pointers to its elements. so reserve size for now
m_mappings.reserve(10);
}
void natpmp::start(address local_address, std::string device)
{
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TORRENT_ASSERT(is_single_thread());
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error_code ec;
// assume servers support PCP and fall back to NAT-PMP
// if necessary
m_version = version_pcp;
// we really want a device name to get the right default gateway
// try to find one even if the listen socket isn't bound to a device
if (device.empty())
{
device = device_for_address(local_address, get_io_service(m_socket), ec);
// if this fails fall back to using the first default gateway in the
// routing table
ec.clear();
}
auto const route = get_default_route(get_io_service(m_socket)
, device, local_address.is_v6(), ec);
if (!route)
{
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("failed to find default route for \"%s\" %s: %s"
, device.c_str(), local_address.to_string().c_str()
, convert_from_native(ec.message()).c_str());
}
#endif
disable(ec);
return;
}
if (device.empty()) device = route->name;
TORRENT_ASSERT(!device.empty());
// PCP requires reporting the source address at the application
// layer so the socket MUST be bound to a specific address
// if the caller didn't specify one then get the first suitable
// address from the OS
if (local_address.is_unspecified())
{
std::vector<ip_interface> const net = enum_net_interfaces(
get_io_service(m_socket), ec);
auto const it = std::find_if(net.begin(), net.end(), [&](ip_interface const& i)
{
return i.interface_address.is_v4() == local_address.is_v4()
&& (i.interface_address.is_v4() || !is_local(i.interface_address))
&& i.name == device;
});
if (it != net.end())
{
local_address = it->interface_address;
}
else
{
// if we can't get a specific address to bind to we'll have
// to fall back to NAT-PMP
// but NAT-PMP doesn't support IPv6 so if that's what is being
// requested we can't do anything
if (local_address.is_v6())
{
if (!ec) ec = boost::asio::error::address_family_not_supported;
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("cannot map IPv6 without a local address, %s"
, convert_from_native(ec.message()).c_str());
}
#endif
disable(ec);
return;
}
m_version = version_natpmp;
ec.clear();
}
}
m_disabled = false;
udp::endpoint const nat_endpoint(route->gateway, 5351);
if (nat_endpoint == m_nat_endpoint) return;
m_nat_endpoint = nat_endpoint;
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("found router at: %s"
, print_address(m_nat_endpoint.address()).c_str());
}
#endif
m_socket.open(local_address.is_v4() ? udp::v4() : udp::v6(), ec);
if (ec)
{
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disable(ec);
return;
}
m_socket.bind({local_address, 0}, ec);
if (ec)
{
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disable(ec);
return;
}
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ADD_OUTSTANDING_ASYNC("natpmp::on_reply");
m_socket.async_receive_from(boost::asio::buffer(&m_response_buffer[0]
, sizeof(m_response_buffer))
, m_remote, std::bind(&natpmp::on_reply, self(), _1, _2));
if (m_version == version_natpmp)
send_get_ip_address_request();
for (auto i = m_mappings.begin(), end(m_mappings.end()); i != end; ++i)
{
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if (i->protocol == portmap_protocol::none
|| i->act != portmap_action::none)
continue;
i->act = portmap_action::add;
update_mapping(port_mapping_t(int(i - m_mappings.begin())));
}
}
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void natpmp::send_get_ip_address_request()
{
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TORRENT_ASSERT(is_single_thread());
using namespace libtorrent::detail;
// this opcode only exists in NAT-PMP
// PCP routers report the external IP in the response to a MAP operation
TORRENT_ASSERT(m_version == version_natpmp);
if (m_version != version_natpmp)
return;
char buf[2];
char* out = buf;
write_uint8(version_natpmp, out);
write_uint8(0, out); // public IP address request opcode
#ifndef TORRENT_DISABLE_LOGGING
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log("==> get public IP address");
#endif
error_code ec;
m_socket.send_to(boost::asio::buffer(buf, sizeof(buf)), m_nat_endpoint, 0, ec);
}
bool natpmp::get_mapping(port_mapping_t const index, int& local_port
, int& external_port, portmap_protocol& protocol) const
{
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TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(index < m_mappings.end_index() && index >= port_mapping_t{});
if (index >= m_mappings.end_index() || index < port_mapping_t{}) return false;
mapping_t const& m = m_mappings[index];
if (m.protocol == portmap_protocol::none) return false;
local_port = m.local_port;
external_port = m.external_port;
protocol = m.protocol;
return true;
}
#ifndef TORRENT_DISABLE_LOGGING
bool natpmp::should_log() const
{
return m_callback.should_log_portmap(portmap_transport::natpmp);
}
void natpmp::mapping_log(char const* op, mapping_t const& m) const
{
if (should_log())
{
log("%s-mapping: proto: %s port: %d local-port: %d action: %s ttl: %" PRId64
, op
, m.protocol == portmap_protocol::none
? "none" : to_string(m.protocol)
, m.external_port
, m.local_port
, to_string(m.act)
, total_seconds(m.expires - aux::time_now()));
}
}
TORRENT_FORMAT(2, 3)
void natpmp::log(char const* fmt, ...) const
{
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TORRENT_ASSERT(is_single_thread());
if (!should_log()) return;
char msg[200];
va_list v;
va_start(v, fmt);
std::vsnprintf(msg, sizeof(msg), fmt, v);
va_end(v);
m_callback.log_portmap(portmap_transport::natpmp, msg);
}
#endif
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void natpmp::disable(error_code const& ec)
{
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TORRENT_ASSERT(is_single_thread());
m_disabled = true;
for (auto i = m_mappings.begin(), end(m_mappings.end()); i != end; ++i)
{
if (i->protocol == portmap_protocol::none) continue;
portmap_protocol const proto = i->protocol;
i->protocol = portmap_protocol::none;
port_mapping_t const index(static_cast<int>(i - m_mappings.begin()));
m_callback.on_port_mapping(index, address(), 0, proto, ec
, portmap_transport::natpmp);
}
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close_impl();
}
void natpmp::delete_mapping(port_mapping_t const index)
{
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TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(index < m_mappings.end_index() && index >= port_mapping_t{});
if (index >= m_mappings.end_index() || index < port_mapping_t{}) return;
mapping_t& m = m_mappings[index];
if (m.protocol == portmap_protocol::none) return;
if (!m.map_sent)
{
m.act = portmap_action::none;
m.protocol = portmap_protocol::none;
return;
}
m.act = portmap_action::del;
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update_mapping(index);
}
port_mapping_t natpmp::add_mapping(portmap_protocol const p, int const external_port
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, tcp::endpoint const local_ep)
{
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TORRENT_ASSERT(is_single_thread());
if (m_disabled) return port_mapping_t{-1};
auto i = std::find_if(m_mappings.begin()
, m_mappings.end(), [] (mapping_t const& m) { return m.protocol == portmap_protocol::none; });
if (i == m_mappings.end())
{
m_mappings.push_back(mapping_t());
i = m_mappings.end() - 1;
}
aux::random_bytes(i->nonce);
i->protocol = p;
i->external_port = external_port;
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i->local_port = local_ep.port();
i->act = portmap_action::add;
port_mapping_t const mapping_index(static_cast<int>(i - m_mappings.begin()));
#ifndef TORRENT_DISABLE_LOGGING
mapping_log("add",*i);
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#endif
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update_mapping(mapping_index);
return port_mapping_t{mapping_index};
}
void natpmp::try_next_mapping(port_mapping_t const i)
{
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TORRENT_ASSERT(is_single_thread());
if (i < prev(m_mappings.end_index()))
{
update_mapping(next(i));
return;
}
auto const m = std::find_if(
m_mappings.begin(), m_mappings.end()
, [] (mapping_t const& ma) { return ma.act != portmap_action::none
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&& ma.protocol != portmap_protocol::none; });
if (m == m_mappings.end())
{
if (m_abort)
{
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error_code ec;
m_send_timer.cancel(ec);
m_socket.close(ec);
}
return;
}
update_mapping(port_mapping_t(static_cast<int>(m - m_mappings.begin())));
}
void natpmp::update_mapping(port_mapping_t const i)
{
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TORRENT_ASSERT(is_single_thread());
if (i == m_mappings.end_index())
{
if (m_abort)
{
error_code ec;
m_send_timer.cancel(ec);
m_socket.close(ec);
}
return;
}
mapping_t const& m = m_mappings[i];
#ifndef TORRENT_DISABLE_LOGGING
mapping_log("update", m);
#endif
if (m.act == portmap_action::none
|| m.protocol == portmap_protocol::none)
{
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try_next_mapping(i);
return;
}
if (m_currently_mapping == port_mapping_t{-1})
{
// the socket is not currently in use
// send out a mapping request
m_retry_count = 0;
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send_map_request(i);
}
}
void natpmp::send_map_request(port_mapping_t const i)
{
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TORRENT_ASSERT(is_single_thread());
using namespace libtorrent::detail;
TORRENT_ASSERT(m_currently_mapping == port_mapping_t{-1}
|| m_currently_mapping == i);
m_currently_mapping = i;
mapping_t& m = m_mappings[i];
TORRENT_ASSERT(m.act != portmap_action::none);
char buf[60];
char* out = buf;
int ttl = m.act == portmap_action::add ? 3600 : 0;
if (m_version == version_natpmp)
{
write_uint8(m_version, out);
write_uint8(m.protocol == portmap_protocol::udp ? 1 : 2, out); // map "protocol"
write_uint16(0, out); // reserved
write_uint16(m.local_port, out); // private port
write_uint16(m.external_port, out); // requested public port
write_uint32(ttl, out); // port mapping lifetime
}
else if (m_version == version_pcp)
{
// PCP requires the use of IPv6 addresses even for IPv4 messages
write_uint8(m_version, out);
write_uint8(opcode_map, out);
write_uint16(0, out); // reserved
write_uint32(ttl, out);
address const local_addr = m_socket.local_endpoint().address();
auto const local_bytes = local_addr.is_v4()
? address_v6::v4_mapped(local_addr.to_v4()).to_bytes()
: local_addr.to_v6().to_bytes();
out = std::copy(local_bytes.begin(), local_bytes.end(), out);
out = std::copy(m.nonce.begin(), m.nonce.end(), out);
// translate portmap_protocol to an IANA protocol number
int const protocol =
(m.protocol == portmap_protocol::tcp) ? 6
: (m.protocol == portmap_protocol::udp) ? 17
: 0;
write_int8(protocol, out);
write_uint8(0, out); // reserved
write_uint16(0, out); // reserved
write_uint16(m.local_port, out);
write_uint16(m.external_port, out);
address_v6 external_addr;
if (!m.external_address.is_unspecified())
{
external_addr = m.external_address.is_v4()
? address_v6::v4_mapped(m.external_address.to_v4())
: m.external_address.to_v6();
}
else if (is_local(local_addr))
{
external_addr = local_addr.is_v4()
? address_v6::v4_mapped(address_v4())
: address_v6();
}
else if (local_addr.is_v4())
{
external_addr = address_v6::v4_mapped(local_addr.to_v4());
}
else
{
external_addr = local_addr.to_v6();
}
write_address(external_addr, out);
}
else
{
TORRENT_ASSERT_FAIL();
}
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("==> port map [ mapping: %d action: %s"
" transport: %s proto: %s local: %u external: %u ttl: %u ]"
, static_cast<int>(i), to_string(m.act)
, version_to_string(m_version)
, to_string(m.protocol)
, m.local_port, m.external_port, ttl);
}
#endif
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error_code ec;
m_socket.send_to(boost::asio::buffer(buf, std::size_t(out - buf)), m_nat_endpoint, 0, ec);
m.map_sent = true;
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m.outstanding_request = true;
if (m_abort)
{
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// when we're shutting down, ignore the
// responses and just remove all mappings
// immediately
m_currently_mapping = port_mapping_t{-1};
m.act = portmap_action::none;
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try_next_mapping(i);
}
else
{
ADD_OUTSTANDING_ASYNC("natpmp::resend_request");
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// linear back-off instead of exponential
++m_retry_count;
m_send_timer.expires_from_now(milliseconds(250 * m_retry_count), ec);
m_send_timer.async_wait(std::bind(&natpmp::on_resend_request, self(), i, _1));
}
}
void natpmp::on_resend_request(port_mapping_t const i, error_code const& e)
{
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TORRENT_ASSERT(is_single_thread());
COMPLETE_ASYNC("natpmp::resend_request");
if (e) return;
resend_request(i);
}
void natpmp::resend_request(port_mapping_t const i)
{
if (m_currently_mapping != i) return;
// if we're shutting down, don't retry, just move on
// to the next mapping
if (m_retry_count >= 9 || m_abort)
{
m_currently_mapping = port_mapping_t{-1};
m_mappings[i].act = portmap_action::none;
// try again in two hours
m_mappings[i].expires = aux::time_now() + hours(2);
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try_next_mapping(i);
return;
}
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send_map_request(i);
}
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void natpmp::on_reply(error_code const& e
, std::size_t const bytes_transferred)
{
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TORRENT_ASSERT(is_single_thread());
COMPLETE_ASYNC("natpmp::on_reply");
using namespace libtorrent::detail;
if (e)
{
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("error on receiving reply: %s"
, convert_from_native(e.message()).c_str());
}
#endif
return;
}
if (m_abort) return;
ADD_OUTSTANDING_ASYNC("natpmp::on_reply");
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// make a copy of the response packet buffer
// to avoid overwriting it in the next receive call
std::array<char, sizeof(m_response_buffer)> msg_buf;
std::memcpy(msg_buf.data(), m_response_buffer, bytes_transferred);
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m_socket.async_receive_from(boost::asio::buffer(&m_response_buffer[0]
, sizeof(m_response_buffer))
, m_remote, std::bind(&natpmp::on_reply, self(), _1, _2));
if (m_remote != m_nat_endpoint)
{
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("received packet from wrong IP: %s"
, print_endpoint(m_remote).c_str());
}
#endif
return;
}
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error_code ec;
m_send_timer.cancel(ec);
if (bytes_transferred < 4)
{
#ifndef TORRENT_DISABLE_LOGGING
log("received packet of invalid size: %d", int(bytes_transferred));
#endif
return;
}
char* in = msg_buf.data();
int const version = read_uint8(in);
if (version != version_natpmp && version != version_pcp)
{
#ifndef TORRENT_DISABLE_LOGGING
log("unexpected version: %u", version);
#endif
return;
}
int cmd = read_uint8(in);
if (version == version_pcp)
{
cmd &= 0x7f;
}
int result;
if (version == version_pcp)
{
++in; // reserved
result = read_uint8(in);
}
else
{
result = read_uint16(in);
}
if (result == errors::pcp_unsupp_version)
{
#ifndef TORRENT_DISABLE_LOGGING
log("unsupported version");
#endif
if (m_version == version_pcp && !is_v6(m_socket.local_endpoint()))
{
m_version = version_natpmp;
resend_request(m_currently_mapping);
send_get_ip_address_request();
}
return;
}
if ((version == version_natpmp && bytes_transferred < 12)
|| (version == version_pcp && bytes_transferred < 24))
{
#ifndef TORRENT_DISABLE_LOGGING
log("received packet of invalid size: %d", int(bytes_transferred));
#endif
return;
}
int lifetime = 0;
if (version == version_pcp)
{
lifetime = aux::numeric_cast<int>(read_uint32(in));
}
int const time = aux::numeric_cast<int>(read_uint32(in));
if (version == version_pcp) in += 12; // reserved
TORRENT_UNUSED(time);
if (version == version_natpmp && cmd == 128)
{
// public IP request response
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m_external_ip = read_v4_address(in);
#ifndef TORRENT_DISABLE_LOGGING
if (should_log())
{
log("<== public IP address [ %s ]", print_address(m_external_ip).c_str());
}
#endif
return;
}
if ((version == version_natpmp && bytes_transferred != 16)
|| (version == version_pcp && bytes_transferred != 60))
{
#ifndef TORRENT_DISABLE_LOGGING
log("received packet of invalid size: %d", int(bytes_transferred));
#endif
return;
}
std::array<char, 12> nonce;
portmap_protocol protocol = portmap_protocol::none;
if (version == version_pcp)
{
std::memcpy(nonce.data(), in, nonce.size());
in += nonce.size();
int p = read_uint8(in);
protocol = p == 6 ? portmap_protocol::tcp
: portmap_protocol::udp;
in += 3; // reserved
}
int const private_port = read_uint16(in);
int const public_port = read_uint16(in);
if (version == version_natpmp)
lifetime = aux::numeric_cast<int>(read_uint32(in));
address external_addr;
if (version == version_pcp)
{
external_addr = read_v6_address(in);
if (external_addr.to_v6().is_v4_mapped())
external_addr = external_addr.to_v6().to_v4();
}
if (version == version_natpmp)
{
protocol = (cmd - 128 == 1)
? portmap_protocol::udp
: portmap_protocol::tcp;
}
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#ifndef TORRENT_DISABLE_LOGGING
char msg[200];
int const num_chars = std::snprintf(msg, sizeof(msg), "<== port map ["
" transport: %s protocol: %s local: %d external: %d ttl: %d ]"
, version_to_string(protocol_version(version))
, (protocol == portmap_protocol::udp ? "udp" : "tcp")
, private_port, public_port, lifetime);
#endif
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mapping_t* m = nullptr;
port_mapping_t index{-1};
for (auto i = m_mappings.begin(), end(m_mappings.end()); i != end; ++i)
{
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if (private_port != i->local_port) continue;
if (protocol != i->protocol) continue;
if (!i->map_sent) continue;
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if (!i->outstanding_request) continue;
if (version == version_pcp && nonce != i->nonce) continue;
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m = &*i;
index = port_mapping_t(static_cast<int>(i - m_mappings.begin()));
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break;
}
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if (m == nullptr)
{
#ifndef TORRENT_DISABLE_LOGGING
snprintf(msg + num_chars, sizeof(msg) - aux::numeric_cast<std::size_t>(num_chars), " not found in map table");
log("%s", msg);
#endif
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return;
}
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m->outstanding_request = false;
#ifndef TORRENT_DISABLE_LOGGING
log("%s", msg);
#endif
if (public_port == 0 || lifetime == 0)
{
// this means the mapping was
// successfully closed
m->protocol = portmap_protocol::none;
}
else
{
m->expires = aux::time_now() + seconds(int(lifetime * 0.7f));
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m->external_port = public_port;
if (!external_addr.is_unspecified())
m->external_address = external_addr;
}
if (result != 0)
{
m->expires = aux::time_now() + hours(2);
portmap_protocol const proto = m->protocol;
m_callback.on_port_mapping(port_mapping_t{index}, address(), 0, proto
, from_result_code(version, result), portmap_transport::natpmp);
}
else if (m->act == portmap_action::add)
{
portmap_protocol const proto = m->protocol;
address const ext_ip = version == version_pcp ? m->external_address : m_external_ip;
m_callback.on_port_mapping(port_mapping_t{index}, ext_ip, m->external_port, proto
, errors::pcp_success, portmap_transport::natpmp);
}
m_currently_mapping = port_mapping_t{-1};
m->act = portmap_action::none;
m_send_timer.cancel(ec);
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update_expiration_timer();
try_next_mapping(index);
}
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void natpmp::update_expiration_timer()
{
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TORRENT_ASSERT(is_single_thread());
if (m_abort) return;
time_point const now = aux::time_now() + milliseconds(100);
time_point min_expire = now + seconds(3600);
port_mapping_t min_index{-1};
for (auto i = m_mappings.begin(), end(m_mappings.end()); i != end; ++i)
{
if (i->protocol == portmap_protocol::none
|| i->act != portmap_action::none) continue;
port_mapping_t const index(static_cast<int>(i - m_mappings.begin()));
if (i->expires < now)
{
#ifndef TORRENT_DISABLE_LOGGING
log("mapping %u expired", static_cast<int>(index));
#endif
i->act = portmap_action::add;
if (m_next_refresh == index) m_next_refresh = port_mapping_t{-1};
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update_mapping(index);
}
else if (i->expires < min_expire)
{
min_expire = i->expires;
min_index = index;
}
}
// this is already the mapping we're waiting for
if (m_next_refresh == min_index) return;
if (min_index >= port_mapping_t{})
{
#ifndef TORRENT_DISABLE_LOGGING
log("next expiration [ idx: %d ttl: %" PRId64 " ]"
, static_cast<int>(min_index), total_seconds(min_expire - aux::time_now()));
#endif
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error_code ec;
if (m_next_refresh >= port_mapping_t{}) m_refresh_timer.cancel(ec);
ADD_OUTSTANDING_ASYNC("natpmp::mapping_expired");
m_refresh_timer.expires_from_now(min_expire - now, ec);
m_refresh_timer.async_wait(std::bind(&natpmp::mapping_expired, self(), _1, min_index));
m_next_refresh = min_index;
}
}
void natpmp::mapping_expired(error_code const& e, port_mapping_t const i)
{
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TORRENT_ASSERT(is_single_thread());
COMPLETE_ASYNC("natpmp::mapping_expired");
if (e) return;
#ifndef TORRENT_DISABLE_LOGGING
log("mapping %u expired", static_cast<int>(i));
#endif
m_mappings[i].act = portmap_action::add;
if (m_next_refresh == i) m_next_refresh = port_mapping_t{-1};
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update_mapping(i);
}
void natpmp::close()
{
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TORRENT_ASSERT(is_single_thread());
close_impl();
}
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void natpmp::close_impl()
{
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TORRENT_ASSERT(is_single_thread());
m_abort = true;
#ifndef TORRENT_DISABLE_LOGGING
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log("closing");
#endif
if (m_disabled) return;
for (auto& m : m_mappings)
{
if (m.protocol == portmap_protocol::none) continue;
m.act = portmap_action::del;
}
error_code ec;
m_refresh_timer.cancel(ec);
m_currently_mapping = port_mapping_t{-1};
update_mapping(port_mapping_t{});
}
} // namespace libtorrent