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addon-context-linux/base_arch/etc/one-context.d/10-network

231 lines
5.0 KiB

#!/bin/bash
# -------------------------------------------------------------------------- #
# Copyright 2010-2014, C12G Labs S.L. #
# #
# Licensed under the Apache License, Version 2.0 (the "License"); you may #
# not use this file except in compliance with the License. You may obtain #
# a copy of the License at #
# #
# http://www.apache.org/licenses/LICENSE-2.0 #
# #
# Unless required by applicable law or agreed to in writing, software #
# distributed under the License is distributed on an "AS IS" BASIS, #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
# See the License for the specific language governing permissions and #
# limitations under the License. #
#--------------------------------------------------------------------------- #
# Gets IP address from a given MAC
mac2ip() {
mac=$1
let ip_a=0x`echo $mac | cut -d: -f 3`
let ip_b=0x`echo $mac | cut -d: -f 4`
let ip_c=0x`echo $mac | cut -d: -f 5`
let ip_d=0x`echo $mac | cut -d: -f 6`
ip="$ip_a.$ip_b.$ip_c.$ip_d"
echo $ip
}
mask2cidr() {
mask=$1
nbits=0
IFS=.
for dec in $mask ; do
case $dec in
255) let nbits+=8;;
254) let nbits+=7 ; break ;;
252) let nbits+=6 ; break ;;
248) let nbits+=5 ; break ;;
240) let nbits+=4 ; break ;;
224) let nbits+=3 ; break ;;
192) let nbits+=2 ; break ;;
128) let nbits+=1 ; break ;;
0);;
*) echo "Error: $dec is not recognised"; exit 1
esac
done
echo "$nbits"
}
# Gets the network part of an IP
get_network() {
network=$(get_iface_var "NETWORK")
if [ -z "$network" ]; then
network="$(echo $IP | cut -d'.' -f1,2,3).0"
fi
echo $network
}
# Gets the network mask
get_mask() {
mask=$(get_iface_var "MASK")
if [ -z "$mask" ]; then
mask="255.255.255.0"
fi
echo $mask
}
# Gets device MTU
get_mtu() {
mtu=$(get_iface_var "MTU")
echo $mtu
}
is_gateway() {
if [ -z "$GATEWAY_IFACE_NUM" ]; then
true
else
[ "$IFACE_NUM" = "$GATEWAY_IFACE_NUM" ]
fi
}
# Gets the network gateway
get_gateway() {
if is_gateway; then
gateway=$(get_iface_var "GATEWAY")
if [ -z "$gateway" ]; then
if [ "$DEV" = "eth0" ]; then
net_prefix=$(echo $NETWORK | cut -d'.' -f1,2,3)
gateway="${net_prefix}.1"
fi
fi
echo $gateway
fi
}
# Gets the network gateway6
get_gateway6() {
if is_gateway; then
get_iface_var "GATEWAY6"
fi
}
get_ip() {
ip=$(get_iface_var "IP")
if [ -z "$ip" ]; then
ip=$(mac2ip $MAC)
fi
echo $ip
}
get_iface_var() {
var_name="${UPCASE_DEV}_$1"
var=$(eval "echo \"\${$var_name}\"")
echo $var
}
gen_iface_conf() {
cat <<EOT
[Network]
Address=$IP/$CIDR
EOT
if [ -n "$GATEWAY" ]; then
echo "Gateway=$GATEWAY"
fi
if [ -n "$MTU" ]; then
cat <<EOT
[Link]
MTUBytes=$MTU"
EOT
fi
echo ""
}
gen_iface6_conf() {
cat <<EOT
[Network]
Address=$IPV6/64
EOT
if [ -n "$GATEWAY6" ]; then
echo "Gateway=$GATEWAY6"
fi
if [ -n "$MTU" ]; then
cat <<EOT
[Link]
MTUBytes=$MTU
EOT
fi
echo ""
}
get_interface_mac()
{
ip link show | awk '/^[0-9]+: [[:alnum:]]+:/ { device=$2; gsub(/:/, "",device)} /link\/ether/ { print device " " $2 }'
}
get_context_interfaces()
{
env | grep -E "^ETH[0-9]+_MAC=" | sed 's/_.*$//' | sort
}
get_dev()
{
list="$1"
mac="$2"
echo "$list" | grep "$mac" | cut -d' ' -f1 | tail -n1
}
gen_network_configuration()
{
INTERFACE_MAC=$(get_interface_mac)
CONTEXT_INTERFACES=$(get_context_interfaces)
GATEWAY_IFACE_NUM=$(echo "$GATEWAY_IFACE" | sed 's/^ETH//')
for interface in $CONTEXT_INTERFACES; do
UPCASE_DEV=$interface
MAC=$(get_iface_var "MAC")
DEV=$(get_dev "$INTERFACE_MAC" "$MAC")
IFACE_NUM=$(echo "$UPCASE_DEV" | sed 's/^ETH//')
IP=$(get_ip)
NETWORK=$(get_network)
MASK=$(get_mask)
CIDR=$(mask2cidr "$MASK")
MTU=$(get_mtu)
GATEWAY=$(get_gateway)
IPV6=$(get_iface_var "IPV6")
[[ -z $IPV6 ]] && IPV6=$(get_iface_var "IP6")
GATEWAY6=$(get_gateway6)
CONTEXT_FORCE_IPV4=$(get_iface_var "CONTEXT_FORCE_IPV4")
(
cat <<EOT
[Match]
Name=$DEV
EOT
[[ -z $IPV6 || -n $CONTEXT_FORCE_IPV4 ]] && gen_iface_conf
[[ -n $IPV6 ]] && gen_iface6_conf
) > /etc/systemd/network/${DEV}.network
done
}
gen_network_configuration