nvtsrv: Optionally echo all input from client

nvtsrv/nvtsrv.c

@@ -3,6 +3,7 @@
  */
 #include <poll.h>
 #include <signal.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -14,7 +15,7 @@
 
 
 #define HELP \
-    "Usage: nvtsrv -dq\n"
+    "Usage: nvtsrv -deq\n"
 
 
 struct {
@@ -116,10 +117,12 @@ int main(int argc, char **argv)
     char            buf[128];
     int             rc, nr, i, len;
     int             debug, quiet;
+    bool            do_echo;
 
     debug = quiet = 0;
+    do_echo = false;
 
-    while ((opt = getopt(argc, argv, "dq")) != -1)
+    while ((opt = getopt(argc, argv, "deq")) != -1)
     {
         switch (opt)
         {
@@ -129,6 +132,9 @@ int main(int argc, char **argv)
         case 'd':
             debug += 1;
             break;
+        case 'e':              /* Echo received data */
+            do_echo = true;
+            break;
         case 'q':
             quiet = 1;
             break;
@@ -205,6 +211,11 @@ int main(int argc, char **argv)
                 DBG2_BUF("Rx", buf, nr);
                 len = nr;
                 rc = telnet_rx(dd.tnct, buf, &len);
+                if (do_echo)
+                {
+                    /* Echo received */
+                    _tn_tx(NULL, buf, len);
+                }
             }
         }