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#!/bin/bash
#
# This script was mostly stolen from 40network/parse-ip-opts.sh. Its
# actions are adapted to write .network files to /etc/systemd/network
# in the initramfs instead o
command -v getarg >/dev/null || . /lib/dracut-lib.sh
main_work() {
local IPCONF="$(getarg ip=)"
local BOOTIF="$(getarg BOOTIF=)"
if [ -z "${IPCONF}" ] && [ -z "${BOOTIF}" ]; then
# No ip= argument(s) given by PXE, TODO try dhcp
return;
fi
# ip= is expected in following format (syslinux IPAPPEND3):
# <CLIENT_IP>:<PXE_SERVER_IP>:<GATEWAY_IP>:<NETMASK>
local CLIENT_IP=
local SERVER_IP=
local GATEWAY_IP=
local NETMASK=
read -r CLIENT_IP SERVER_IP GATEWAY_IP NETMASK <<< $( awk -F: '{print $1" "$2" "$3" "$4}' <<< "${IPCONF}" )
# BOOTIF= contains the MAC address of the boot interface
# and a hardware type prefix of length 2, e.g. "01-"
# So if BOOTIF has 20 chars, then we got the prefix.
# This needs to be stripped to get the MAC address only
[ -n "${BOOTIF}" ] && [ ${#BOOTIF} -eq 20 ] && BOOTIF="${BOOTIF#???}"
BOOTIF="$(tr '-' ':' <<< $BOOTIF)"
# TODO sanity checks
# Taken from parse-ip-opts.sh
# Convert the netmask to CIDR notation
if [[ "x$NETMASK" =~ ^x[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
CIDR=$(mask2cidr "$NETMASK")
elif [ -n "$NETMASK" -a "x${NETMASK//[0-9]/}" = 'x' ]; then
# The mask is already a prefix length (uint), so validate it
[[ "x$CLIENT_IP" == x*:*:* && "$NETMASK" -le 128 || "$NETMASK" -le 32 ]] && CIDR=$NETMASK
fi
# Generate network and link file for networkd
NETWORK_FILE=/etc/systemd/network/01-boot-lan.network
mkdir -p $(dirname $NETWORK_FILE)
echo '[Match]' > $NETWORK_FILE
echo 'Name=bootnet' >> $NETWORK_FILE
# Hardcode bootnet as our boot interface
[ -n "$BOOTIF" ] && echo "MACAddress=$BOOTIF" >> $NETWORK_FILE
echo '[Network]' >> $NETWORK_FILE
echo 'Bridge=br0' >> $NETWORK_FILE
## Boot interface has 'bootnet' as dedicated name
LINK_FILE=/etc/systemd/network/00-boot-lan.link
echo '[Match]' > $LINK_FILE
[ -n "$BOOTIF" ] && echo "MACAddress=$BOOTIF" >> $LINK_FILE
echo '[Link]' >> $LINK_FILE
echo "Name=bootnet" >> $LINK_FILE
# HACK pro bridge setup
BRIDGE_DEV_CONF=/etc/systemd/network/10-bridge-lan.netdev
echo '[NetDev]' > $BRIDGE_DEV_CONF
echo 'Name=br0' >> $BRIDGE_DEV_CONF
echo 'Kind=bridge' >> $BRIDGE_DEV_CONF
BRIDGE_IF_CONF=/etc/systemd/network/11-bridge-lan.network
echo '[Match]' > $BRIDGE_IF_CONF
echo "Name=br0" >> $BRIDGE_IF_CONF
echo '[Network]' >> $BRIDGE_IF_CONF
[ -n "$CLIENT_IP" ] && echo "Address=${CLIENT_IP}/${CIDR:-24}" >> $BRIDGE_IF_CONF
[ -n "$GATEWAY_IP" ] && echo "Gateway=${GATEWAY_IP}" >> $BRIDGE_IF_CONF
}
# from parse-ip-opts.sh
# Takes a netmask and outputs the corresponding CIDR
# e.g.
# mask2cidr 255.255.255.0
# returns: 24
function mask2cidr() {
local -i bits=0
for octet in ${1//./ }; do
for i in {0..8}; do
[ "$octet" -eq $(( 256 - (1 << i) )) ] && bits+=$((8-i)) && break
done
[ $i -eq 8 -a "$octet" -ne 0 ] && warn "Bad netmask $mask" && return
[ $i -gt 0 ] && break
done
echo $bits
}
main_work
# HACK to wait for network during udev loop...
touch /lib/dracut/need-initqueue
/sbin/initqueue --finished /bin/busybox timeout -t 10 /lib/systemd/systemd-networkd-wait-online -i br0
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