fix

main.cpp

@@ -10,12 +10,16 @@
 #include <unistd.h>
 #include <arpa/inet.h>
 
+in_addr_t remote;
+
 // internet -> tun
 void inbound(int raw, int tun) {
     char buf[ETH_DATA_LEN];
     sockaddr_in addr{AF_INET};
+    socklen_t addrlen;
     size_t nread;
-    while ((nread = recvfrom(raw, buf, sizeof(buf), 0, (sockaddr *)&addr, nullptr)) >= 0) {
+    while ((nread = recvfrom(raw, buf, sizeof(buf), 0, (sockaddr *) &addr, &addrlen)) >= 0) {
+        std::cout << nread << std::endl;
         if (write(tun, buf, nread) < 0) {
             perror("outbound write");
         }
@@ -23,7 +27,6 @@ void inbound(int raw, int tun) {
     perror("outbound read");
 }
 
-in_addr_t remote;
 // tun -> internet
 void outbound(int raw, int tun) {
     char buf[ETH_DATA_LEN];
@@ -31,14 +34,14 @@ void outbound(int raw, int tun) {
     addr.sin_addr.s_addr = remote;
     size_t nread;
     while ((nread = read(tun, buf, sizeof(buf))) >= 0) {
-        if (sendto(raw, buf, nread, 0, (sockaddr *) &addr,  sizeof(addr)) < 0) {
+        if (sendto(raw, buf, nread, 0, (sockaddr *) &addr, sizeof(addr)) < 0) {
             perror("inbound write");
         }
     }
     perror("inbound read");
 }
 
-int main(int argc, char* argv[]) {
+int main(int argc, char *argv[]) {
     ifreq ifr{};
     ifr.ifr_flags = IFF_TUN | IFF_NO_PI;