congestvpn/main.cpp

#include <cstdio>
#include <unistd.h>
#include <signal.h>

#include "TunDevice.hpp"

static const size_t BUFFER_SIZE = 1500;
static volatile bool stopped = false;

void stop_sig_handler(int signal) {
    printf("Received signal %d. Stopping.\n", signal);
    stopped = true;
}

int main(void) {
    char read_buffer[BUFFER_SIZE];

    signal(SIGINT, stop_sig_handler);
    try {
        TunDevice tun_dev("cvpn%d");
        printf("Tunnel device opened: <%s>, fd <%d>.\n",
                tun_dev.get_dev_name().c_str(), tun_dev.get_fd());
        while(!stopped) {
            size_t packet_size = tun_dev.read_packet(read_buffer, BUFFER_SIZE);

            if(packet_size > 0) {
                printf("Received packet of size %lu.\n", packet_size);
                tun_dev.write_packet(read_buffer, packet_size);
            }
        }
        printf("Shutting down.\n");
    } catch(const TunDevice::InitializationError& exn) {
        fprintf(stderr, "ERROR: %s\n", exn.what());
    }
    return 0;
}