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examples: make udhcpc script handle /32 netmasks

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-04-06 00:53:43 +02:00
parent 19578b4edf
commit 9c192e7f94
3 changed files with 25 additions and 5 deletions
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9
examples/udhcp/sample.bound
View File

@ -18,11 +18,18 @@ then
metric=0 metric=0
for i in $router for i in $router
do do
if [ "$subnet" = "255.255.255.255" ]; then
# special case for /32 subnets:
# /32 instructs kernel to always use routing for all outgoing packets
# (they can never be sent to local subnet - there is no local subnet for /32).
# Used in datacenters, avoids the need for private ip-addresses between two hops.
/sbin/ip route add $i dev $interface
fi
/sbin/route add default gw $i dev $interface metric $((metric++)) /sbin/route add default gw $i dev $interface metric $((metric++))
done done
fi fi
# Only replace resolv.conf is we have at least one DNS server # Only replace resolv.conf if we have at least one DNS server
if [ -n "$dns" ] if [ -n "$dns" ]
then then
echo -n > $RESOLV_CONF echo -n > $RESOLV_CONF

11
examples/udhcp/sample.renew
View File

@ -1,5 +1,5 @@
#!/bin/sh #!/bin/sh
# Sample udhcpc bound script # Sample udhcpc renew script
RESOLV_CONF="/etc/udhcpc/resolv.conf" RESOLV_CONF="/etc/udhcpc/resolv.conf"
@ -18,11 +18,18 @@ then
metric=0 metric=0
for i in $router for i in $router
do do
if [ "$subnet" = "255.255.255.255" ]; then
# special case for /32 subnets:
# /32 instructs kernel to always use routing for all outgoing packets
# (they can never be sent to local subnet - there is no local subnet for /32).
# Used in datacenters, avoids the need for private ip-addresses between two hops.
/sbin/ip route add $i dev $interface
fi
/sbin/route add default gw $i dev $interface metric $((metric++)) /sbin/route add default gw $i dev $interface metric $((metric++))
done done
fi fi
# Only replace resolv.conf is we have at least one DNS server # Only replace resolv.conf if we have at least one DNS server
if [ -n "$dns" ] if [ -n "$dns" ]
then then
echo -n > $RESOLV_CONF echo -n > $RESOLV_CONF

10
examples/udhcp/simple.script
View File

@ -29,8 +29,14 @@ case "$1" in
metric=0 metric=0
for i in $router ; do for i in $router ; do
echo "Adding router $i" echo "Adding router $i"
route add default gw $i dev $interface metric $metric if [ "$subnet" = "255.255.255.255" ]; then
: $(( metric += 1 )) # special case for /32 subnets:
# /32 instructs kernel to always use routing for all outgoing packets
# (they can never be sent to local subnet - there is no local subnet for /32).
# Used in datacenters, avoids the need for private ip-addresses between two hops.
ip route add $i dev $interface
fi
route add default gw $i dev $interface metric $((metric++))
done done
fi fi