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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2016-07-25 16:28:57 +0200
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2016-07-25 16:28:57 +0200
commit3191ec7ccedbf7265a409a314513cef5a8143495 (patch)
tree8015ed4e511e664ae45a24739afa94afb8e479c1 /examples
parentf8ddbe1ccce9eceaaac28b4b1aa71631fcc56db6 (diff)
downloadbusybox-3191ec7ccedbf7265a409a314513cef5a8143495.tar.gz
busybox-3191ec7ccedbf7265a409a314513cef5a8143495.tar.bz2
var_service/fw: optionally flush all netdevs; optionally prefer one 0/0 routing
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'examples')
-rwxr-xr-xexamples/var_service/fw/run48
1 files changed, 36 insertions, 12 deletions
diff --git a/examples/var_service/fw/run b/examples/var_service/fw/run
index 81c7f2e7c..871a70545 100755
--- a/examples/var_service/fw/run
+++ b/examples/var_service/fw/run
@@ -1,18 +1,20 @@
#!/bin/bash
# (using bashism: arrays)
-service="${PWD##*/}"
-rundir="/var/run/service/$service"
-
-user=root
-extif=if
-ext_open_tcp="21 22 80" # space-separated
+user="root"
+reset_all_netdevs=true
+preferred_default_route_iface="if"
+extif="if"
+ext_open_tcp="22 80 88" # space-separated
# Make ourself one-shot
sv o .
# Debug
#date '+%Y-%m-%d %H:%M:%S' >>"$0.log"
+service=`basename $PWD`
+rundir="/var/run/service/$service"
+
### filter This is the default table (if no -t option is passed). It contains
### the built-in chains INPUT (for packets coming into the box itself),
### FORWARD (for packets being routed through the box), and OUTPUT (for
@@ -70,7 +72,6 @@ ln -s "$rundir" rundir
# Timestamping
date '+%Y-%m-%d %H:%M:%S'
-
echo; echo "* Reading IP config"
cfg=-1
# static cfg dhcp,zeroconf etc
@@ -86,11 +87,19 @@ echo; echo "* Configuring hardware"
#doit ethtool -K if rx off tx off sg off tso off
echo; echo "* Resetting address and routing info"
-doit ip a f dev lo
-i=0; while test "${if[$i]}"; do
- doit ip a f dev "${if[$i]}"
- doit ip r f dev "${if[$i]}" root 0/0
-let i++; done
+if $reset_all_netdevs; then
+ devs=`sed -n 's/ //g;s/:.*$//p' </proc/net/dev`
+ for if in $devs; do
+ doit ip a f dev "$if"
+ doit ip r f dev "$if" root 0/0
+ done
+else
+ doit ip a f dev lo
+ i=0; while test "${if[$i]}"; do
+ doit ip a f dev "${if[$i]}"
+ doit ip r f dev "${if[$i]}" root 0/0
+ let i++; done
+fi
echo; echo "* Configuring addresses"
doit ip a a dev lo 127.0.0.1/8 scope host
@@ -103,7 +112,22 @@ i=0; while test "${if[$i]}"; do
let i++; done
echo; echo "* Configuring routes"
+# If several ifaces are configured via DHCP, they often both have 0/0 route.
+# They have no way of knowing that this route is offered on more than one iface.
+# Often, it's desirable to prefer one iface: say, wired eth over wireless.
+# if preferred_default_route_iface is not set, 0/0 route will be assigned randomly.
+if test "$preferred_default_route_iface"; then
+ i=0; while test "${if[$i]}"; do
+ if test "${if[$i]}" = "$preferred_default_route_iface" \
+ && test "${net[$i]}" = "0/0" \
+ && test "${gw[$i]}"; then
+ echo "+ default route through ${if[$i]}, ${gw[$i]}:"
+ doit ip r a "${net[$i]}" via "${gw[$i]}"
+ fi
+ let i++; done
+fi
i=0; while test "${if[$i]}"; do
+ #echo $i:"${if[$i]}"
if test "${net[$i]}" && test "${gw[$i]}"; then
doit ip r a "${net[$i]}" via "${gw[$i]}"
fi