create_ap

commit f66819c145dbc90bb8000e81ad3a89877e1f3a42
parent 3fe8513d9aa2a456bc56d5f2fc1a4576d655c35b
Author: oblique <psyberbits@gmail.com>
Date:   Sat,  6 Sep 2014 21:49:52 +0300

Check if the user passed a valid interface

Diffstat:
M
create_ap
 | 
10
++++++++++

1 file changed, 10 insertions(+), 0 deletions(-)
diff --git a/create_ap b/create_ap
@@ -82,6 +82,11 @@ version_cmp() {
 
 USE_IWCONFIG=0
 
+is_interface() {
+    [[ -z "$1" ]] && return 1
+    ip link show $1 > /dev/null 2>&1
+}
+
 is_wifi_interface() {
     which iw > /dev/null 2>&1 && iw dev $1 info > /dev/null 2>&1 && return 0
     if which iwconfig > /dev/null 2>&1 && iwconfig $1 > /dev/null 2>&1; then
@@ -579,6 +584,11 @@ else
     fi
 fi
 
+if [[ "$SHARE_METHOD" != "none" ]] && ! is_interface $INTERNET_IFACE; then
+    echo "ERROR: '${INTERNET_IFACE}' is not an interface" >&2
+    exit 1
+fi
+
 if [[ "$SHARE_METHOD" == "bridge" ]]; then
     OLD_BRIDGE_IPTABLES=$(cat /proc/sys/net/bridge/bridge-nf-call-iptables)