1 files changed, 41 insertions, 0 deletions
diff --git a/debian/qemu-ifup.linux b/debian/qemu-ifup.linux
new file mode 100755
index 00000000..76b68ea5
--- /dev/null
+++ b/debian/qemu-ifup.linux
@@ -0,0 +1,41 @@
+#! /bin/sh
+# Script to bring a network (tap) device for qemu up.
+# The idea is to add the tap device to the same bridge
+# as we have default routing to.
+
+# in order to be able to find brctl
+PATH=$PATH:/sbin:/usr/sbin
+ip=$(command -v ip)
+
+if [ -n "$ip" ]; then
+   ip link set "$1" up
+else
+   brctl=$(command -v brctl)
+   if [ -z "$ip$brctl" ]; then
+     echo "W: $0: not doing any bridge processing: neither ip nor brctl utility not found" >&2
+     exit 0
+   fi
+   ifconfig "$1" 0.0.0.0 up
+fi
+
+switch=$(ip route ls | \
+    awk '/^default / {
+          for(i=0;i<NF;i++) { if ($i == "dev") { print $(i+1); next; } }
+         }'
+        )
+
+# only add the interface to default-route bridge if we
+# have such interface (with default route) and if that
+# interface is actually a bridge.
+# It is possible to have several default routes too
+for br in $switch; do
+    if [ -d /sys/class/net/$br/bridge/. ]; then
+        if [ -n "$ip" ]; then
+          exec ip link set "$1" master "$br"
+        else
+          exec brctl addif $br "$1"
+        fi
+    fi
+done
+
+echo "W: $0: no bridge for guest interface found" >&2