--- /dev/null
+#include <fcntl.h>
+#include <string.h>
+#include <stropts.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <stdint.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#include <assert.h>
+
+#include <atomic>
+#include <chrono>
+#include <thread>
+
+#if __has_include(<sys/random.h>)
+#include <sys/random.h>
+#else
+int getrandom(void* buf, size_t len, unsigned int flags) {
+ FILE* f = fopen("/dev/urandom", "r");
+ int res = fread(buf, len, 1, f);
+ fclose(f);
+ return res;
+}
+#endif
+
+
+static int tun_alloc(char *dev, int queues, int *fds)
+{
+ struct ifreq ifr;
+ int fd, err, i;
+
+ if (!dev)
+ return -1;
+
+ memset(&ifr, 0, sizeof(ifr));
+
+ /* Flags: IFF_TUN - TUN device (no Ethernet headers)
+ * IFF_TAP - TAP device
+ *
+ * IFF_NO_PI - Do not provide packet information
+ */
+ ifr.ifr_flags = IFF_TUN | IFF_NO_PI | IFF_MULTI_QUEUE;
+ strncpy(ifr.ifr_name, dev, IFNAMSIZ);
+
+ for (i = 0; i < queues; i++) {
+ if((fd = open("/dev/net/tun", O_RDWR)) < 0)
+ goto err;
+ err = ioctl(fd, TUNSETIFF, (void *) &ifr);
+ if (err) {
+ close(fd);
+ goto err;
+ }
+ fds[i] = fd;
+ }
+ return 0;
+err:
+ for (--i; i >= 0; i--)
+ close(fds[i]);
+ return err;
+}
+
+static int check_ip_header(const unsigned char* buf, ssize_t buf_len, uint8_t expected_type) {
+ if (buf_len < 20) {
+ // < size than IPv4?
+ return -1;
+ }
+
+ if ((buf[0] & 0xf0) != (4 << 4)) {
+ // Only support IPv4
+ return -1;
+ }
+
+ uint8_t num_words = buf[0] & 0xf;
+ int header_size = num_words * 4;
+ if (header_size < 20) {
+ fprintf(stderr, "Invalid IPv4 IHL size (%d)\n", header_size);
+ return -1;
+ }
+
+ if ((((uint16_t)buf[2]) << 8 | buf[3]) != buf_len) {
+ //fprintf(stderr, "Packet len %u != %ld\n", ((uint16_t)buf[2]) << 8 | buf[3], buf_len);
+ return -1;
+ }
+
+ if (buf[9] != expected_type) {
+ fprintf(stderr, "Packet type %u, not %u\n", buf[9], expected_type);
+ return -1;
+ }
+
+ return header_size;
+}
+
+void print_packet(const unsigned char* buf, ssize_t buf_len) {
+ for (ssize_t i = 0; i < buf_len; ) {
+ for (int j = 0; i < buf_len && j < 20; i++, j++)
+ fprintf(stderr, "%02x", buf[i]);
+ fprintf(stderr, "\n");
+ }
+}
+
+static uint32_t data_checksum(const unsigned char* buf, size_t len) {
+ uint32_t sum = 0;
+
+ while (len > 1)
+ {
+ sum += *buf++;
+ sum += (*buf++) << 8;
+ if (sum & 0x80000000)
+ sum = (sum & 0xFFFF) + (sum >> 16);
+ len -= 2;
+ }
+
+ if (len & 1)
+ sum += *buf;
+
+ return sum;
+}
+
+static uint16_t finalize_data_checksum(uint32_t sum) {
+ while (sum >> 16)
+ sum = (sum & 0xFFFF) + (sum >> 16);
+
+ return (uint16_t)(~sum);
+}
+
+static uint16_t tcp_checksum(const unsigned char* buff, size_t len, in_addr_t src_addr, in_addr_t dest_addr)
+{
+ uint16_t *ip_src = (uint16_t*)&src_addr, *ip_dst = (uint16_t*)&dest_addr;
+ uint32_t sum = data_checksum(buff, len);
+
+ sum += *(ip_src++);
+ sum += *ip_src;
+ sum += *(ip_dst++);
+ sum += *ip_dst;
+ sum += htons(IPPROTO_TCP);
+ sum += htons(len);
+
+ return finalize_data_checksum(sum);
+}
+
+static std::atomic<uint32_t> highest_recvd_seq(0), cur_seq(0);
+static std::atomic<uint16_t> local_port(0);
+static uint16_t remote_port;
+static bool are_server;
+
+static void build_tcp_header(unsigned char* buf, uint32_t len, int syn, int synack, in_addr_t src_addr, in_addr_t dest_addr) {
+ buf[0 ] = local_port >> 8; // src port
+ buf[1 ] = local_port; // src port
+ buf[2 ] = remote_port >> 8; // dst port
+ buf[3 ] = remote_port; // dst port
+
+ uint32_t seq = cur_seq.fetch_add((syn || synack) ? 1 : len, std::memory_order_acq_rel);
+ buf[4 ] = seq >> (8 * 3); // SEQ
+ buf[5 ] = seq >> (8 * 2); // SEQ
+ buf[6 ] = seq >> (8 * 1); // SEQ
+ buf[7 ] = seq >> (8 * 0); // SEQ
+
+ uint32_t their_seq = highest_recvd_seq.load(std::memory_order_relaxed);
+ buf[8 ] = their_seq >> (8 * 3); // ACK
+ buf[9 ] = their_seq >> (8 * 2); // ACK
+ buf[10] = their_seq >> (8 * 1); // ACK
+ buf[11] = their_seq >> (8 * 0); // ACK
+
+ bool longpkt = syn || synack;
+ buf[12] = (longpkt ? 6 : 5) << 4; // data offset
+ if (syn)
+ buf[13] = 1 << 1; // SYN
+ else if (synack)
+ buf[13] = (1 << 1) | (1 << 4); // SYN + ACK
+ else if (len == 0)
+ buf[13] = 1 << 4; // ACK
+ else
+ buf[13] = 3 << 3; // PSH + ACK
+ buf[14] = 0xff; // Window Size
+ buf[15] = 0xff; // Window Size
+
+ buf[16] = 0x00; // Checksum
+ buf[17] = 0x00; // Checksum
+ buf[18] = 0x00; // URG Pointer
+ buf[19] = 0x00; // URG Pointer
+
+ if (longpkt) {
+ buf[20] = 0x01; // NOP
+ buf[21] = 0x03; // Window Scale
+ buf[22] = 0x03; // Window Scale Option Length
+ buf[23] = 0x0e; // 1GB Window Size (0xffff << 0x0e)
+ }
+
+ uint16_t checksum = tcp_checksum(buf, len + 20 + (longpkt ? 4 : 0), src_addr, dest_addr);
+ buf[16] = checksum; // Checksum
+ buf[17] = checksum >> 8; // Checksum
+}
+
+static void build_ip_header(unsigned char* buf, uint32_t len, uint8_t proto, const in_addr_t& src_addr, const in_addr_t& dest_addr) {
+ buf[0 ] = (4 << 4) | 5; // IPv4 + IHL of 5 (20 bytes)
+ buf[1 ] = 0; // DSCP 0 + ECN 0
+ buf[2 ] = (len + 20) >> 8; // Length
+ buf[3 ] = (len + 20); // Length
+ memset(buf + 4, 0, 4); // Identification and Fragment 0s
+ buf[6 ] = 1 << 6; // DF bit
+ buf[8 ] = 255; // TTL
+ buf[9 ] = proto; // Protocol Number
+ buf[10] = 0; // Checksum
+ buf[11] = 0; // Checksum
+
+ memcpy(buf + 12, &src_addr, 4);
+ memcpy(buf + 16, &dest_addr, 4);
+
+ uint16_t checksum = finalize_data_checksum(data_checksum(buf, 20));
+ buf[10] = checksum;
+ buf[11] = checksum >> 8;
+}
+
+
+const signed char p_util_hexdigit[256] =
+{ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ 0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,
+ -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, };
+
+uint32_t hex_to_num(const char* buf) {
+ const char* pbegin = buf;
+ while (p_util_hexdigit[*buf] != -1)
+ buf++;
+ buf--;
+ uint32_t res = 0;
+ unsigned char* p1 = (unsigned char*)&res;
+ unsigned char* pend = p1 + 4;
+ while (buf >= pbegin && p1 < pend) {
+ *p1 = p_util_hexdigit[*buf--];
+ if (buf >= pbegin) {
+ *p1 |= ((unsigned char)p_util_hexdigit[*buf--] << 4);
+ p1++;
+ }
+ }
+
+ return res;
+}
+
+#define TUN_IF_COUNT 4
+static int fdr;
+static int fd[TUN_IF_COUNT];
+static struct sockaddr_in dest;
+static in_addr_t src, tun_src, tun_dest, ipip_src, ipip_dest;
+static const uint64_t tcp_init_magic = 0x1badcafedeadbeefULL;
+
+#define PENDING_MESSAGES_BUFF_SIZE (0x3000)
+#define PACKET_READ_SIZE 1500
+#define THREAD_POLL_SLEEP_MICS 50
+struct MessageQueue {
+ std::tuple<sockaddr_in, std::array<unsigned char, PACKET_READ_SIZE>, ssize_t> messagesPendingRingBuff[PENDING_MESSAGES_BUFF_SIZE];
+ std::atomic<uint16_t> nextPendingMessage, nextUndefinedMessage;
+ MessageQueue() : nextPendingMessage(0), nextUndefinedMessage(0) {}
+ MessageQueue(MessageQueue&& q) =delete;
+ MessageQueue(MessageQueue& q) =delete;
+};
+
+static MessageQueue tcp_to_tun_queue;
+static std::chrono::steady_clock::time_point last_ack_recv;
+
+static void tcp_to_tun() {
+ unsigned char buf[1500];
+ struct sockaddr_in pkt_src;
+ memset(&pkt_src, 0, sizeof(pkt_src));
+
+ while (1) {
+ socklen_t hostsz = sizeof(pkt_src);
+ ssize_t nread = recvfrom(fdr, buf, sizeof(buf), 0, (struct sockaddr*)&pkt_src, &hostsz);
+ if (nread < 0) {
+ fprintf (stderr, "Failed to read tcp raw sock\n");
+ exit(-1);
+ }
+
+ if (tcp_to_tun_queue.nextPendingMessage == (tcp_to_tun_queue.nextUndefinedMessage + 1) % PENDING_MESSAGES_BUFF_SIZE)
+ continue;
+
+ auto& new_msg = tcp_to_tun_queue.messagesPendingRingBuff[tcp_to_tun_queue.nextUndefinedMessage];
+ std::get<0>(new_msg) = pkt_src;
+ memcpy(std::get<1>(new_msg).data(), buf, nread);
+ std::get<2>(new_msg) = nread;
+
+ tcp_to_tun_queue.nextUndefinedMessage = (tcp_to_tun_queue.nextUndefinedMessage + 1) % PENDING_MESSAGES_BUFF_SIZE;
+ }
+}
+
+static void tcp_to_tun_queue_process() {
+ do {
+ while (tcp_to_tun_queue.nextUndefinedMessage == tcp_to_tun_queue.nextPendingMessage) {
+ std::this_thread::sleep_for(std::chrono::microseconds(THREAD_POLL_SLEEP_MICS));
+ }
+
+ auto& msg = tcp_to_tun_queue.messagesPendingRingBuff[tcp_to_tun_queue.nextPendingMessage];
+
+ const sockaddr_in& pkt_src = std::get<0>(msg);
+ unsigned char* buf = std::get<1>(msg).data();
+ ssize_t nread = std::get<2>(msg);
+
+ int header_size = check_ip_header(buf, nread, 0x06); // Only support TCP
+ if (header_size < 0)
+ continue;
+
+ if (nread - header_size < 20) {
+ fprintf(stderr, "Short TCP packet\n");
+ continue;
+ }
+
+ unsigned char* tcp_buf = buf + header_size;
+
+ if (((tcp_buf[2] << 8) | tcp_buf[3]) != local_port) continue;
+
+ bool syn = tcp_buf[13] & (1 << 1);
+ bool ack = tcp_buf[13] & (1 << 4);
+
+ if (are_server && syn && !ack) {
+ // We're a server and just got a client
+ if (tcp_buf[4 ] != uint8_t(tcp_init_magic >> (7 * 8)) ||
+ tcp_buf[5 ] != uint8_t(tcp_init_magic >> (6 * 8)) ||
+ tcp_buf[6 ] != uint8_t(tcp_init_magic >> (5 * 8)) ||
+ tcp_buf[7 ] != uint8_t(tcp_init_magic >> (4 * 8)) ||
+ tcp_buf[8 ] != uint8_t(tcp_init_magic >> (3 * 8)) ||
+ tcp_buf[9 ] != uint8_t(tcp_init_magic >> (2 * 8)) ||
+ tcp_buf[10] != uint8_t(tcp_init_magic >> (1 * 8)) ||
+ tcp_buf[11] != uint8_t(tcp_init_magic >> (0 * 8)))
+ continue;
+
+ fprintf(stderr, "Got SYN, sending SYNACK\n");
+ remote_port = (tcp_buf[0] << 8) | tcp_buf[1];
+ dest = pkt_src;
+ }
+
+ if (((tcp_buf[0] << 8) | tcp_buf[1]) != remote_port) continue;
+ if (pkt_src.sin_addr.s_addr != dest.sin_addr.s_addr) continue;
+
+ uint8_t num_words = (tcp_buf[12] & 0xf0) >> 4;
+ int tcp_header_size = num_words * 4;
+ if (tcp_header_size < 20) {
+ fprintf(stderr, "Invalid TCP header size (%d)\n", tcp_header_size);
+ continue;
+ }
+
+ highest_recvd_seq = ((((uint32_t)tcp_buf[4]) << (8 * 3)) |
+ (((uint32_t)tcp_buf[5]) << (8 * 2)) |
+ (((uint32_t)tcp_buf[6]) << (8 * 1)) |
+ (((uint32_t)tcp_buf[7]) << (8 * 0))) +
+ (syn ? 1 : nread - header_size - tcp_header_size);
+
+ if (ack)
+ last_ack_recv = std::chrono::steady_clock::now();
+
+ if (are_server && syn && !ack) {
+ build_tcp_header(tcp_buf, 0, 0, 1, src, dest.sin_addr.s_addr);
+
+ ssize_t res = sendto(fdr, tcp_buf, 20 + 4, 0, (struct sockaddr*)&dest, sizeof(dest));
+ if (res < 0) {
+ int err = errno;
+ fprintf(stderr, "Failed to send SYNACK with err %d (%s)\n", err, strerror(err));
+ }
+ } else if (!syn) {
+ tcp_buf += tcp_header_size - 20;
+
+ // Replace TCP with IPv4 header
+ //build_ip_header(tcp_buf, nread - tcp_header_size - header_size, 0x01, ipip_dest, ipip_src); // ICMP
+ build_ip_header(tcp_buf, nread - tcp_header_size - header_size, 0x11, ipip_dest, ipip_src); // UDP
+ // Add IPIP header
+ build_ip_header(tcp_buf - 20, nread - tcp_header_size - header_size + 20, 0x04, tun_dest, tun_src);
+
+ write(fd[0], tcp_buf - 20, nread - tcp_header_size - header_size + 40);
+ }
+ } while ((tcp_to_tun_queue.nextPendingMessage = (tcp_to_tun_queue.nextPendingMessage + 1) % PENDING_MESSAGES_BUFF_SIZE) || true);
+}
+
+static std::atomic_int tun_if_thread(0), tun_if_process_thread(0);
+static std::atomic_bool pause_tun_read_reinit_tcp(false);
+static MessageQueue tun_to_tcp_queue[TUN_IF_COUNT];
+
+static void tun_to_tcp() {
+ unsigned char buf[PACKET_READ_SIZE];
+
+ int thread = tun_if_thread.fetch_add(1);
+ MessageQueue& queue = tun_to_tcp_queue[thread];
+
+ while (1) {
+ ssize_t nread = read(fd[thread], buf, sizeof(buf));
+ if (pause_tun_read_reinit_tcp)
+ continue;
+
+ if (nread < 0) {
+ fprintf (stderr, "Failed to read tun if\n");
+ continue;
+ }
+
+ if (queue.nextPendingMessage == (queue.nextUndefinedMessage + 1) % PENDING_MESSAGES_BUFF_SIZE)
+ continue;
+
+ auto& new_msg = queue.messagesPendingRingBuff[queue.nextUndefinedMessage];
+ memcpy(std::get<1>(new_msg).data(), buf, nread);
+ std::get<2>(new_msg) = nread;
+
+ queue.nextUndefinedMessage = (queue.nextUndefinedMessage + 1) % PENDING_MESSAGES_BUFF_SIZE;
+ }
+}
+
+static void tun_to_tcp_queue_process() {
+ int thread = tun_if_process_thread.fetch_add(1);
+ MessageQueue& queue = tun_to_tcp_queue[thread];
+
+ do {
+ while (queue.nextUndefinedMessage == queue.nextPendingMessage) {
+ std::this_thread::sleep_for(std::chrono::microseconds(THREAD_POLL_SLEEP_MICS));
+ }
+ if (pause_tun_read_reinit_tcp)
+ continue;
+
+ auto& msg = queue.messagesPendingRingBuff[queue.nextPendingMessage];
+
+ unsigned char* buf = std::get<1>(msg).data();
+ ssize_t nread = std::get<2>(msg);
+
+ int header_size = check_ip_header(buf, nread, 0x04); // Only support IPIP
+ if (header_size < 0)
+ continue;
+
+ int internal_header_size = check_ip_header(buf + header_size, nread - header_size, 0x11); // Only support UDP
+ //int internal_header_size = check_ip_header(buf + header_size, nread - header_size, 0x01); // Only support ICMP
+ if (internal_header_size < 0)
+ continue;
+
+ if (internal_header_size + header_size + 8 > nread) {
+ fprintf(stderr, "Short UDP-in-IPIP packet\n");
+ continue;
+ }
+
+ size_t tcp_start_offset = header_size + internal_header_size - 20;
+ build_tcp_header(buf + tcp_start_offset, nread - tcp_start_offset - 20, 0, 0, src, dest.sin_addr.s_addr);
+
+ ssize_t res = sendto(fdr, buf + tcp_start_offset, nread - tcp_start_offset, 0, (struct sockaddr*)&dest, sizeof(dest));
+ if (res < 0) {
+ int err = errno;
+ fprintf(stderr, "Failed to send with err %d (%s)\n", err, strerror(err));
+ }
+
+ } while ((queue.nextPendingMessage = (queue.nextPendingMessage + 1) % PENDING_MESSAGES_BUFF_SIZE) || true);
+}
+
+int do_init() {
+ //
+ // Send SYN and SYN/ACK
+ //
+
+ if (!are_server) {
+ if (local_port) // Doing a re-init
+ pause_tun_read_reinit_tcp = true;
+
+ uint16_t local_port_tmp = 0;
+ while (local_port_tmp < 1024)
+ assert(getrandom(&local_port_tmp, sizeof(local_port_tmp), 0) == sizeof(local_port_tmp));
+
+ local_port = local_port_tmp;
+ }
+
+ uint32_t starting_ack = 0, starting_seq = 0;
+ memcpy(&starting_ack, &tcp_init_magic, 4);
+ memcpy(&starting_seq, ((const unsigned char*)&tcp_init_magic) + 4, 4);
+ highest_recvd_seq = starting_ack;
+ cur_seq = starting_seq;
+
+ if (!pause_tun_read_reinit_tcp) { // Not doing a re-init
+ std::thread t(&tcp_to_tun);
+ std::thread t2(&tcp_to_tun_queue_process);
+ t.detach();
+ t2.detach();
+ }
+
+ unsigned char buf[1500];
+ if (!are_server) {
+ build_tcp_header(buf, 0, 1, 0, src, dest.sin_addr.s_addr);
+ ssize_t res = sendto(fdr, buf, 20 + 4, 0, (struct sockaddr*)&dest, sizeof(dest));
+ if (res < 0) {
+ int err = errno;
+ fprintf(stderr, "Failed to send initial SYN with err %d (%s)\n", err, strerror(err));
+ return -1;
+ }
+ }
+
+ int i;
+ for (i = 0; i < 1000 && highest_recvd_seq == starting_ack; i++)
+ std::this_thread::sleep_for(std::chrono::milliseconds(10));
+ if (i == 1000) // Will come back in 10 seconds
+ return 0;
+
+ if (!are_server) {
+ fprintf(stderr, "Got SYNACK, sending ACK and starting tun listen\n");
+
+ build_tcp_header(buf, 0, 0, 0, src, dest.sin_addr.s_addr);
+ ssize_t res = sendto(fdr, buf, 20, 0, (struct sockaddr*)&dest, sizeof(dest));
+ if (res < 0) {
+ int err = errno;
+ fprintf(stderr, "Failed to send initial ACK with err %d (%s)\n", err, strerror(err));
+ return -1;
+ }
+ }
+
+ if (pause_tun_read_reinit_tcp) {
+ pause_tun_read_reinit_tcp = false;
+ } else {
+ for (int i = 0; i < TUN_IF_COUNT; i++) {
+ std::thread t3(&tun_to_tcp);
+ std::thread t4(&tun_to_tcp_queue_process);
+ t3.detach();
+ t4.detach();
+ }
+ }
+
+ return 0;
+}
+
+int main(int argc, char* argv[]) {
+ assert(argc > 1 && "Need tun name");
+ assert(argc > 2 && "Need tun remote host");
+ assert(argc > 3 && "Need tun local host");
+ assert(argc > 4 && "Need ipip remote host");
+ assert(argc > 5 && "Need ipip local host");
+ assert(argc > 6 && "Need server port");
+ assert(argc > 7 && "Need mode (client or server)");
+ assert(argc > 8 && "Need src host");
+ if (std::string(argv[7]) == std::string("client"))
+ assert(argc > 9 && "Need dest host");
+
+ assert(std::string(argv[7]) == std::string("client") || std::string(argv[7]) == std::string("server"));
+ are_server = (std::string(argv[7]) == std::string("server"));
+
+ //
+ // Parse args into variables
+ //
+
+ char tun_name[IFNAMSIZ];
+
+ memset(tun_name, 0, sizeof(tun_name));
+ strcpy(tun_name, argv[1]);
+
+ tun_dest = inet_addr(argv[2]);
+ tun_src = inet_addr(argv[3]);
+
+ ipip_dest = inet_addr(argv[4]);
+ ipip_src = inet_addr(argv[5]);
+
+ if (are_server) {
+ local_port = atoi(argv[6]);
+ remote_port = 0;
+ } else {
+ // Get local port in do_init() so that we pick a new one on reload
+ remote_port = atoi(argv[6]);
+ }
+
+ src = inet_addr(argv[8]);
+
+ memset(&dest, 0, sizeof(dest));
+ if (!are_server) {
+ dest.sin_family = AF_INET;
+ dest.sin_addr.s_addr = inet_addr(argv[9]);
+ }
+
+ //
+ // Create tun and bind to sockets...
+ //
+
+ if (tun_alloc(tun_name, TUN_IF_COUNT, fd) < 0) {
+ fprintf(stderr, "Failed to alloc tun if\n");
+ return -1;
+ }
+
+ fdr = socket(AF_INET, SOCK_RAW, IPPROTO_TCP);
+ if (fdr < 0) {
+ fprintf(stderr, "Failed to get raw socket\n");
+ return -1;
+ }
+
+ int res = do_init();
+ if (res)
+ return res;
+
+ while (true) {
+ std::this_thread::sleep_for(std::chrono::seconds(15));
+ if (!are_server && last_ack_recv < std::chrono::steady_clock::now() - std::chrono::seconds(15)) {
+ res = do_init();
+ if (res)
+ return res;
+ }
+ }
+}
projects / tunudptotcp / commitdiff