[PATCH 2/2] network: add static route support

[Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

User may specify static route for a target address which is different
than default gateway. The static route file could be like below:

192.168.200.222 via 192.168.100.222 dev eth0

Or

ADDRESS0=192.168.200.0
NETMASK0=255.255.255.0
GATEWAY0=192.168.100.222

In this patch, port the static route hanling from ifup-routes of initscript
component.

Signed-off-by: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 modules.d/40network/net-lib.sh | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index d53e1a6..a9c647a 100755
--- a/modules.d/40network/net-lib.sh
+++ b/modules.d/40network/net-lib.sh
@@ -103,6 +103,16 @@ setup_net() {
     [ -e /tmp/net.$netif.resolv.conf ] && \
         cp -f /tmp/net.$netif.resolv.conf /etc/resolv.conf
 
+    #add static route if exist
+    f="/etc/route-$netif"
+    if [ -e "$f" ]; then
+        if grep -Eq '^[[:space:]]*ADDRESS[0-9]+=' $f ; then
+            handle_file $f $netif
+        else
+            handle_ip_file $f
+        fi
+    fi
+
     # Handle STP Timeout: arping the default gateway.
     # (or the root server, if a) it's local or b) there's no gateway.)
     # Note: This assumes that if no router is present the
@@ -517,6 +527,38 @@ find_iface_with_link() {
     return 1
 }
 
+MATCH='^[[:space:]]*(\#.*)?$'
+
+handle_file () {
+    . $1
+    routenum=0
+    while [ "x$(eval echo '$'ADDRESS$routenum)x" != "xx" ]; do
+        eval $(ipcalc -p $(eval echo '$'ADDRESS$routenum) $(eval echo '$'NETMASK$routenum))
+        line="$(eval echo '$'ADDRESS$routenum)/$PREFIX"
+        if [ "x$(eval echo '$'GATEWAY$routenum)x" != "xx" ]; then
+            line="$line via $(eval echo '$'GATEWAY$routenum)"
+        fi
+        line="$line dev $2"
+        /sbin/ip route add $line
+        routenum=$(($routenum+1))
+    done
+}
+
+handle_ip_file() {
+    local f t type= file=$1 proto="-4"
+    f=${file##*/}
+    t=${f%%-*}
+    type=${t%%6}
+    if [ "$type" != "$t" ]; then
+        proto="-6"
+    fi
+    { cat "$file" ; echo ; } | while read line; do
+        if [[ ! "$line" =~ $MATCH ]]; then
+            /sbin/ip $proto $type add $line
+        fi
+    done
+}
+
 is_persistent_ethernet_name() {
     case "$1" in
         # udev persistent interface names
-- 
1.8.5.3