From bed4c80f31051ec47463caa3e9511374062c6536 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Fri, 7 Apr 2017 13:27:55 +0200
Subject: o Better CMake checks. o Checking command line arguments.

---
 main.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
index e862ee1..9f3028e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -327,9 +327,15 @@ void got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *pa
 }
 
 int main(int argc, char *argv[]) {
-    char *dev = argv[1];
     char errbuf[1000];
 
+    if (argc != 2) {
+        fprintf(stderr, "usage: %s [interface]\n", argv[0]);
+	return EXIT_FAILURE;
+    }
+
+    char *dev = argv[1];
+
     pcap_t *handle;
 
     handle = pcap_open_live(dev, BUFSIZ, 1, 1000, errbuf);
-- 
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