Show tx id on received packet

client.c

@@ -105,12 +105,13 @@ void SendDNS(unsigned char *buf, int size) {
  send(sockfd, buf, size, 0);
 }
 
-int RecvDNS() {
- unsigned char answer[SIZE_OF_RESP];
- memset(answer, 0, SIZE_OF_RESP);
+int RecvDNS(unsigned char *buf, int size) {
+ assert(size == SIZE_OF_RESP);
+ // unsigned char answer[SIZE_OF_RESP];
+ memset(buf, 0, size);
 
  assert(sockfd != 0);
- int nb = recv(sockfd, answer, 512, 0);
+ int nb = recv(sockfd, buf, size, 0);
  return nb;
 
  // printf("====== %d ========\n", (long)threadid);
@@ -160,14 +161,16 @@ int main(int argc, char **argv) {
 
  long long send_time = current_timestamp();
  for (int i = 0; i < num_threads; i++) {
- printf("Thread %d sent a DNS query 0x%x%x to %s.\n", i, buf[i][0], buf[i][1], name_server);
+ printf("Thread %d sent a DNS query 0x%02x%02x to %s.\n", i, buf[i][0], buf[i][1], name_server);
  }
  SetSocketBlockingEnabled(sockfd, true);
 
  for (int i = 0; i < num_threads; i++) {
- int nb = RecvDNS();
+ unsigned char answer[SIZE_OF_RESP];
+ int nb = RecvDNS(&answer, SIZE_OF_RESP);
  long long end_time = current_timestamp();
- printf("Thread %d received a DNS answer with %d bytes. Time: %lld ms.\n", i, nb, end_time - send_time);
+ printf("Thread %d received a DNS answer 0x%02x%02x with %d bytes. Time: %lld ms.\n", i, answer[0], answer[1],
+ nb, end_time - send_time);
  }
 
  return 0;