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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
*/
#include <hicn/transport/utils/hash.h>
#include <hicn/transport/utils/log.h>
#include <io_modules/forwarder/udp_tunnel.h>
#include <io_modules/forwarder/udp_tunnel_listener.h>
#ifndef LINUX
namespace std {
size_t hash<asio::ip::udp::endpoint>::operator()(
const asio::ip::udp::endpoint &endpoint) const {
auto hash_ip = endpoint.address().is_v4()
? endpoint.address().to_v4().to_ulong()
: utils::hash::fnv32_buf(
endpoint.address().to_v6().to_bytes().data(), 16);
uint16_t port = endpoint.port();
return utils::hash::fnv32_buf(&port, 2, hash_ip);
}
} // namespace std
#endif
namespace transport {
namespace core {
UdpTunnelListener::~UdpTunnelListener() {}
void UdpTunnelListener::close() {
strand_->post([this]() {
if (socket_->is_open()) {
socket_->close();
}
});
}
#ifdef LINUX
void UdpTunnelListener::readHandler(std::error_code ec) {
TRANSPORT_LOGD("UdpTunnelConnector receive packet");
// TRANSPORT_LOGD("UdpTunnelConnector received packet length=%lu", length);
if (TRANSPORT_EXPECT_TRUE(!ec)) {
if (current_position_ == 0) {
for (int i = 0; i < Connector::max_burst; i++) {
auto read_buffer = Connector::getRawBuffer();
iovecs_[i][0].iov_base = read_buffer.first;
iovecs_[i][0].iov_len = read_buffer.second;
msgs_[i].msg_hdr.msg_iov = iovecs_[i];
msgs_[i].msg_hdr.msg_iovlen = 1;
msgs_[i].msg_hdr.msg_name = &remote_endpoints_[i];
msgs_[i].msg_hdr.msg_namelen = sizeof(remote_endpoints_[i]);
}
}
int res = recvmmsg(socket_->native_handle(), msgs_ + current_position_,
Connector::max_burst - current_position_, MSG_DONTWAIT,
nullptr);
if (res < 0) {
TRANSPORT_LOGE("Error in recvmmsg.");
}
for (int i = 0; i < res; i++) {
auto packet = Connector::getPacketFromBuffer(
reinterpret_cast<uint8_t *>(
msgs_[current_position_].msg_hdr.msg_iov[0].iov_base),
msgs_[current_position_].msg_len);
auto connector_id =
utils::hash::fnv64_buf(msgs_[current_position_].msg_hdr.msg_name,
msgs_[current_position_].msg_hdr.msg_namelen);
auto connector = connectors_.find(connector_id);
if (connector == connectors_.end()) {
// Create new connector corresponding to new client
/*
* Get the remote endpoint for this particular message
*/
using namespace asio::ip;
if (local_endpoint_.address().is_v4()) {
auto addr = reinterpret_cast<struct sockaddr_in *>(
&remote_endpoints_[current_position_]);
address_v4::bytes_type address_bytes;
std::copy_n(reinterpret_cast<uint8_t *>(&addr->sin_addr),
address_bytes.size(), address_bytes.begin());
address_v4 address(address_bytes);
remote_endpoint_ = udp::endpoint(address, ntohs(addr->sin_port));
} else {
auto addr = reinterpret_cast<struct sockaddr_in6 *>(
&remote_endpoints_[current_position_]);
address_v6::bytes_type address_bytes;
std::copy_n(reinterpret_cast<uint8_t *>(&addr->sin6_addr),
address_bytes.size(), address_bytes.begin());
address_v6 address(address_bytes);
remote_endpoint_ = udp::endpoint(address, ntohs(addr->sin6_port));
}
/**
* Create new connector sharing the same socket of this listener.
*/
auto ret = connectors_.emplace(
connector_id,
std::make_shared<UdpTunnelConnector>(
socket_, strand_, receive_callback_,
[](Connector *, const std::error_code &) {}, [](Connector *) {},
[](Connector *) {}, std::move(remote_endpoint_)));
connector = ret.first;
connector->second->setConnectorId(connector_id);
}
/**
* Use connector callback to process incoming message.
*/
UdpTunnelConnector *c =
dynamic_cast<UdpTunnelConnector *>(connector->second.get());
c->doRecvPacket(*packet);
++current_position_;
}
doRecvPacket();
} else if (ec.value() == static_cast<int>(std::errc::operation_canceled)) {
TRANSPORT_LOGE("The connection has been closed by the application.");
return;
} else {
TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str());
}
}
#endif
void UdpTunnelListener::doRecvPacket() {
#ifdef LINUX
#if ((ASIO_VERSION / 100 % 1000) < 11)
socket_->async_receive(
asio::null_buffers(),
#else
socket_->async_wait(
asio::ip::tcp::socket::wait_read,
#endif
std::bind(&UdpTunnelListener::readHandler, this, std::placeholders::_1));
#else
read_msg_ = Connector::getRawBuffer();
socket_->async_receive_from(
asio::buffer(read_msg_.first, read_msg_.second), remote_endpoint_,
[this](std::error_code ec, std::size_t length) {
if (TRANSPORT_EXPECT_TRUE(!ec)) {
auto packet = Connector::getPacketFromBuffer(read_msg_.first, length);
auto connector_id =
std::hash<asio::ip::udp::endpoint>{}(remote_endpoint_);
auto connector = connectors_.find(connector_id);
if (connector == connectors_.end()) {
// Create new connector corresponding to new client
auto ret = connectors_.emplace(
connector_id, std::make_shared<UdpTunnelConnector>(
socket_, strand_, receive_callback_,
[](Connector *, const std::error_code &) {},
[](Connector *) {}, [](Connector *) {},
std::move(remote_endpoint_)));
connector = ret.first;
connector->second->setConnectorId(connector_id);
}
UdpTunnelConnector *c =
dynamic_cast<UdpTunnelConnector *>(connector->second.get());
c->doRecvPacket(*packet);
doRecvPacket();
} else if (ec.value() ==
static_cast<int>(std::errc::operation_canceled)) {
TRANSPORT_LOGE("The connection has been closed by the application.");
return;
} else {
TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str());
}
});
#endif
}
} // namespace core
} // namespace transport
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