X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=sbin%2Fgrml-sniff;fp=sbin%2Fgrml-sniff;h=cf418336270cf89b148371b21cd690b374000309;hb=4dd28e782446cb5101be9cb1ce5eb3d4df4003e3;hp=3722c6a9b65e627bb1e0a31ecc2f7b19fd019f24;hpb=0b7e26a3e16b09880bb429836dab784008419029;p=grml-network.git

diff --git a/sbin/grml-sniff b/sbin/grml-sniff
index 3722c6a..cf41833 100755
--- a/sbin/grml-sniff
+++ b/sbin/grml-sniff
@@ -32,6 +32,17 @@ fi
 [ -n "$BRIDGE_NAME" ]    || BRIDGE_NAME='br0'
 [ -n "$BRIDGE_DEVICES" ] || BRIDGE_DEVICES='eth0 eth1'
 
+check_devs() {
+  for dev in $BRIDGE_DEVICES ; do
+    ip link show dev "$dev" >/dev/null 2>&1 || return 1
+ done
+}
+
+if ! check_devs ; then
+  eerror "BRIDGE_DEVICES $BRIDGE_DEVICES do not seem to exist." >&2
+  exit 1
+fi
+
 check4progs $BRCTL || exit 1
 
 case "$1" in