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inteno-netmodes: shift range hotplug script
This commit is contained in:
Alex Oprea
Sukru Senli
parent
0da93b1d4a
commit
d44d9e80b9
1 changed files with 251 additions and 0 deletions
251
inteno-netmodes/files/etc/hotplug.d/iface/70-shiftrange
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251
inteno-netmodes/files/etc/hotplug.d/iface/70-shiftrange
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#!/bin/sh
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# this scripts shifts the lan network prefixes
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# if a wan interface has the same network prefix.
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. /lib/functions.sh
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. /lib/functions/network.sh
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local lockfile="/tmp/70-shiftrange.lock"
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local restricted_nets=""
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local all_nets=""
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#####
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##### initial functions
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#####
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initial_check()
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{
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# run only on ifup
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[ "$ACTION" == "ifup" ] || exit 0
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# run only for uplink (not is_lan) interfaces
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local islan="$(uci -q get network.$INTERFACE.is_lan)"
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[ "$islan" != "1" ] || exit 0
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# run only if the uplink interface has a configured protocol
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local proto="$(uci -q get network.$INTERFACE.proto)"
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[ "$proto" != "none" ] || exit 0
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}
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finish()
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{
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lock -u $lockfile
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rm -f $lockfile
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}
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# just one instance of this script at a time
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just_one_instance()
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{
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local counter=0
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local limit=10
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#wait for the lock to become free
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while [ -e $lockfile ] ; do
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sleep 1
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counter=$((counter + 1))
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[ "$counter" -gt "$limit" ] && exit 1
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done
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lock $lockfile
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trap finish EXIT INT TERM
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}
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#####
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##### helper functions
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#####
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#given a an ip and a mask in the form of "192.168.1.1/24"
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#return the network address like "192.168.1.0/24"
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get_network_address()
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{
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local ip="$1"
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[ -z "$ip" ] && return
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local prefix=${ip##*/}
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local ip1=${ip%%.*} ; ip=${ip#*.*}
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local ip2=${ip%%.*} ; ip=${ip#*.*}
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local ip3=${ip%%.*} ; ip=${ip#*.*}
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local ip4=${ip%%/*}
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local ip=$((($ip1 << 24) + ($ip2 << 16) + ($ip3 << 8) + $ip4))
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local mask=$((0xFFFFFFFF >> (32 - $prefix) << (32 - $prefix)))
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local network=$(($ip & $mask))
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local n1=$((($network & 0xFF000000) >> 24))
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local n2=$((($network & 0x00FF0000) >> 16))
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local n3=$((($network & 0x0000FF00) >> 8))
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local n4=$(( $network & 0x000000FF))
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echo "$n1.$n2.$n3.$n4/$prefix"
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}
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#given a network address (192.168.1.0/24)
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#find the next network address (192.168.2.0/24)
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next_network_address()
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{
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local ip=$1
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local prefix=${ip##*/}
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local ip1=${ip%%.*} ; ip=${ip#*.*}
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local ip2=${ip%%.*} ; ip=${ip#*.*}
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local ip3=${ip%%.*} ; ip=${ip#*.*}
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local ip4=${ip%%/*}
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local ip=$((($ip1 << 24) + ($ip2 << 16) + ($ip3 << 8) + $ip4))
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local one=$((1 << (32-$prefix)))
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local new=$(($ip + $one))
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local n1=$((($new & 0xFF000000) >> 24))
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local n2=$((($new & 0x00FF0000) >> 16))
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local n3=$((($new & 0x0000FF00) >> 8))
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local n4=$(( $new & 0x000000FF))
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echo "$n1.$n2.$n3.$n4/$prefix"
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}
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# given a network address and a prefix (192.168.2.0/24)
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# return the first host ip available (192.168.2.1)
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first_host_in_network ()
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{
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local ip=$1
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local prefix=${ip##*/}
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local ip1=${ip%%.*} ; ip=${ip#*.*}
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local ip2=${ip%%.*} ; ip=${ip#*.*}
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local ip3=${ip%%.*} ; ip=${ip#*.*}
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local ip4=${ip%%/*}
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local ip=$((($ip1 << 24) + ($ip2 << 16) + ($ip3 << 8) + $ip4))
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local new=$(($ip + 1))
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local n1=$((($new & 0xFF000000) >> 24))
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local n2=$((($new & 0x00FF0000) >> 16))
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local n3=$((($new & 0x0000FF00) >> 8))
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local n4=$(( $new & 0x000000FF))
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echo "$n1.$n2.$n3.$n4"
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}
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# given a network address,
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# find the next available network address.
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shift_range()
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{
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local net="$1"
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while true ; do
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if [ "$restricted_nets" == "${restricted_nets//$net/}" ] && [ "$all_nets" == "${all_nets//$net/}" ]; then
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# found a net that is not in restricted nets nor in all nets
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break
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fi
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net=$(next_network_address $net)
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done
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echo "$net"
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}
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#####
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##### parse all interfaces section
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#####
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# restricted_nets = all the IPs on wan interfaces
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# all_nets = all the IPs on any interface
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parse_interface()
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{
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local interface=$1
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local nets="" # "192.168.1.1/24"
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local networks="" # "192.168.1.0/24"
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config_get is_lan $interface is_lan
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network_get_subnets nets $interface
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for n in $nets ; do
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networks="$networks $(get_network_address $n)"
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done
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[ "$is_lan" != "1" ] && restricted_nets="$restricted_nets $networks"
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all_nets="$all_nets $networks"
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}
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# parse all the interfaces
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# get all the IPs on wan interfaces and store them in restrict_nets
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# get all the IPs on all interfaces and store them in all_nets
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parse_interfaces()
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{
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config_foreach parse_interface "interface"
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}
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#####
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##### parse all lan interfaces section
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#####
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parse_lan()
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{
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local interface=$1
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local nets=""
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local ips=""
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local newips=""
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local ips_changed=0
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[ "$interface" == "loopback" ] && return
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config_get is_lan $interface is_lan
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[ "$is_lan" == "1" ] || return
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network_get_subnets ips $interface
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for ip in $ips ; do
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net="$(get_network_address $ip)"
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if [ "$restricted_nets" == "${restricted_nets//$net/}" ] ; then
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# net is not in restricted nets
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# append ip to newips
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[ -z "$newips" ] && newips="${ip%/*}" || newips="$newips ${ip%/*}"
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continue
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fi
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#net is in restricted_nets
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local newnet=$(shift_range $net)
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local newip="$(first_host_in_network $newnet)"
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# append newip to newips
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[ -z "$newips" ] && newips="$newip" || newips="$newips $newip"
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ips_changed=1
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logger "$0: Changing the ip on interface $interface from $ip to $newip/${newnet##*/}"
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echo "$0: Changing the ip on interface $interface from $ip to $newip/${newnet##*/}" >/dev/console
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done
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#assign the new ips
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if [ "$ips_changed" == "1" ] ; then
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uci -q set network.$interface.ipaddr="$newips"
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fi
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}
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# parse all the interface with is_lan=1
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parse_lans()
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{
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config_foreach parse_lan "interface"
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}
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#####
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##### main
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#####
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main()
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{
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initial_check
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just_one_instance
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config_load network
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parse_interfaces
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parse_lans
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if [ -n "$(uci changes network)" ] ; then
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ubus call uci commit '{"config":"network"}'
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fi
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}
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main $@
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