From 59324ef0f89d5e270768c47ad6a0e3409114f31d Mon Sep 17 00:00:00 2001
From: Vince Weaver <vince@deater.net>
Date: Sun, 20 Nov 2016 00:15:43 -0500
Subject: [PATCH] webserver: autodetect device name

---
 webserver/Makefile  |  1 +
 webserver/testarp.c | 10 ++++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/webserver/Makefile b/webserver/Makefile
index bd95d795..af43d7af 100644
--- a/webserver/Makefile
+++ b/webserver/Makefile
@@ -1,5 +1,6 @@
 CC = gcc
 CFLAGS = -Wall -O2
+LFLAGS =-lpcap
 
 all:	testarp
 
diff --git a/webserver/testarp.c b/webserver/testarp.c
index a838e7ee..9f9cbc5b 100644
--- a/webserver/testarp.c
+++ b/webserver/testarp.c
@@ -3,9 +3,15 @@
 
 int main(int argc, char **argv) {
 
-	char device[]="wlan0";
+	char *device_name,errbuf[PCAP_ERRBUF_SIZE];
 
-	printf("Using device: %s\n", device);
+	device_name=pcap_lookupdev(errbuf);
+	if (device_name==NULL) {
+		fprintf(stderr,"Can't find default device\n");
+		return -1;
+	}
+
+	printf("Using device: %s\n", device_name);
 
 	return 0;