From 7910823bd48800dfa4903fd0047f09255cae04ad Mon Sep 17 00:00:00 2001
From: Cody Hiar <codyfh@gmail.com>
Date: Sat, 12 May 2018 19:31:38 -0600
Subject: Making dhcp script repeatable

---
 dhcp-server.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/dhcp-server.sh b/dhcp-server.sh
index 7a84d23..ac4b75c 100755
--- a/dhcp-server.sh
+++ b/dhcp-server.sh
@@ -9,7 +9,11 @@ ROUTERIP='192.168.123.1'
 echo 'Restarting Device'
 ip link set "$DEVICE" down
 ip link set "$DEVICE" up
-ip addr add "$ROUTERIP"/24 dev "$DEVICE"  # arbitrary address
+# Check if ip already assigned
+IP_ASSIGNED=$(ip a | grep -A 5 ens9 | grep 192.168.123.1)
+if [ -z "$IP_ASSIGNED" ]; then
+    ip addr add "$ROUTERIP"/24 dev "$DEVICE"  # arbitrary address
+fi
 
 echo 'Allowing ip forwarding/enabling Nat'
 sysctl net.ipv4.ip_forward=1
@@ -20,7 +24,7 @@ iptables -A FORWARD -i "$DEVICE" -o "$INTERNET" -j ACCEPT
 echo 'Creating /etc/dhcpd.conf file'
 #Config file: /etc/dhcpd.conf
 cat > /etc/dhcpd.conf <<- EOM
-option domain-name-servers 1.1.1.1, 1.0.0.1;
+option domain-name-servers 8.8.8.8, 8.8.4.4;
 option subnet-mask 255.255.255.0;
 option routers 192.168.123.100;
 subnet 192.168.123.0 netmask 255.255.255.0 {
@@ -30,4 +34,5 @@ EOM
 #Database file: /var/lib/dhcp/dhcpd.leases
 # cat this to see if a device has been assigned a lease
 #PID file: /var/run/dhcpd.pid
+pkill dhcpd || true
 dhcpd $DEVICE 
-- 
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