108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
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extern "C" {
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#include <arpa/inet.h>
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}
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#include <expected>
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#include <string>
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#include <thread>
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#include <chrono>
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#include <cstring>
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#include <tservice.hpp>
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#include <uxlogger.hpp>
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#include <networkaux.hpp>
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using namespace std::chrono_literals;
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TunService::TunService(int svcport, std::string itunnelnet, std::vector<std::string> ilocalnets) {
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listenport = svcport;
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tunnelnet = itunnelnet;
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localnets = ilocalnets;
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}
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TunService::~TunService() {
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close(listenport);
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}
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std::expected<void, std::string> TunService::Bind(void) {
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struct sockaddr_in address;
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int srvsock;
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if ((srvsock = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Create socker error: " + error);
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}
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int opt = 1;
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if (setsockopt(srvsock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set socket option error: " + error);
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}
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = INADDR_ANY;
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address.sin_port = htons(listenport);
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if (bind(srvsock, (struct sockaddr *)&address, sizeof(address)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Bind error: " + error);
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}
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if (listen(srvsock, 3) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Listen error: " + error);
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}
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sock = srvsock;
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return {};
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}
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std::expected<void, std::string> TunService::Listen(void) {
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struct sockaddr_in address;
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int addrlen = sizeof(address);
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int newsock = 0;
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for (;;) {
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if ((newsock = accept(sock, (struct sockaddr *)&address, (socklen_t *)&addrlen)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Accept error: " + error);
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}
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std::jthread t(&TunService::Handle, this, newsock);
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t.detach();
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}
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return {};
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}
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void TunService::Handle(int sock) {
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auto prefixRes = netprefix(tunnelnet);
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if (!prefixRes) {
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uxlogger.Error(prefixRes.error());
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return;
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}
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auto networkRes = network(tunnelnet);
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if (!networkRes) {
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uxlogger.Error(networkRes.error());
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return;
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}
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int num = (sock - 3);
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auto localaddrRes = nethost(networkRes.value(), prefixRes.value(), num);
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if (!networkRes) {
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uxlogger.Error(networkRes.error());
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return;
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}
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auto remoteaddrRes = nethost(networkRes.value(), prefixRes.value(), num + 1);
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if (!remoteaddrRes) {
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uxlogger.Error(remoteaddrRes.error());
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return;
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}
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uxlogger.Debug("Start socker handler");
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SocketHandler handler;
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std::string laddr = localaddrRes.value();
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std::string raddr = remoteaddrRes.value();
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handler.Handle(sock, laddr, raddr, localnets);
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uxlogger.Debug("Stop socket handler");
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close(sock);
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}
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