3191ec7cc
Denys Vlasenko
2016-07-25
Subject
var_service/fw: optionally flush all netdevs; optionally prefer one 0/0 routing
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examples/var_service/fw/run+36 -12
| @@ -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 | |