From 893631e0030f327ff4c2cb0ad26907f93d9a5643 Mon Sep 17 00:00:00 2001
From: Terrtia <or1994@hotmail.fr>
Date: Wed, 2 Dec 2020 15:54:20 +0100
Subject: [PATCH] fix: [client] no data: send empty D4 packet

---
 client/d4.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/client/d4.c b/client/d4.c
index 8aff813..2d6ce36 100644
--- a/client/d4.c
+++ b/client/d4.c
@@ -210,7 +210,7 @@ void d4_transfert(d4_t* d4)
         //In case of errors see block of 0 bytes
         bzero(buf, d4->snaplen);
         nread = read(d4->source.fd, buf, d4->snaplen);
-        if ( nread > 0 ) {
+        if ( nread >= 0 ) {
             d4_update_header(d4, nread);
             //Do HMAC on header and payload. HMAC field is 0 during computation
             if (d4->ctx) {
@@ -238,6 +238,11 @@ void d4_transfert(d4_t* d4)
                 fprintf(stderr,"Incomplete header written. abort to let consumer known that the packet is corrupted\n");
                 abort();
             }
+            // no data - create empty D4 packet
+            if ( nread == 0 ) {
+              //FIXME no data available, sleep, abort, retry
+              break;
+            }
         } else{
             //FIXME no data available, sleep, abort, retry
             break;