for nested kvm, increment the MAC address

2 files changed, 19 insertions, 1 deletions

diff --git a/conf/dnsmasq.conf b/conf/dnsmasq.conf
index 7200efc..5ab9008 100644
--- a/conf/dnsmasq.conf
+++ b/conf/dnsmasq.conf
@@ -4,6 +4,11 @@ dhcp-range=192.168.10.10,192.168.10.253,255.255.255.0,1h
 enable-tftp
 
 dhcp-host=52:54:00:12:34:56,samizdoot-vm,192.168.10.82
+dhcp-host=52:54:00:12:34:57,samizdote-vm,192.168.10.83
+dhcp-host=52:54:00:12:34:58,samizdeet-vm,192.168.10.84
+dhcp-host=52:54:00:12:34:59,samizdite-vm,192.168.10.85
+dhcp-host=52:54:00:12:34:5A,samizdate-vm,192.168.10.86
+
 #dhcp-host=f0:de:f1:5a:ac:e8,samizdoot-irl,192.168.10.82
 
 pxe-service=x86PC, "Samizdat", pxelinux
diff --git a/src/qemu.sh b/src/qemu.sh
index 2ae982d..130b688 100755
--- a/src/qemu.sh
+++ b/src/qemu.sh
@@ -30,7 +30,20 @@ kcmdline_CDROM='boot=samizdat components quiet splash'
 kcmdline_CDROM_NET="${kcmdline_CDROM} nbdroot=,${nbd_filename}, nbddev=/dev/nbd0 ip=dhcp"
 kcmdline_NET="${kcmdline_CDROM_NET} netkeys"
 
-MAC='52-54-00-12-34-56'
+find_mac()
+{
+  start_mac=$1
+  for mac in $(ip link show | grep link/ether | (read _ mac _; echo $mac | tr : -)); do
+    if [ "${mac%??}" = "${start_mac%??}" ]; then
+      prefix=${mac%??}
+      suffix=$(printf %x $(( 0x${mac##*-} + 1 )))
+      MAC=${prefix}${suffix}
+      return
+    fi
+  done
+  MAC=$start_mac
+}
+find_mac 52-54-00-12-34-56
 
 kcmdline_BOOTIF="BOOTIF=01-$MAC"