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#!/bin/bash
#
# TODO VLAN support
command -v getarg >/dev/null || . /lib/dracut-lib.sh
# static names for the boot interface and its bridge
declare -rg BOOTIF_NAME="boot0"
declare -rg BRIDGE_NAME="br0"
declare -rg RUNTIME_CONF="/run/openslx/network.conf"
mkdir -p "${RUNTIME_CONF%/*}"
# Get all the ip-related arguments from the KCL
parse_kernel_command_line() {
## KCL "BOOTIF": MAC address of the interface that DHCP'ed during PXE
declare -g BOOTIF="$(getarg BOOTIF=)"
# Remove the hardware type prefix of BOOTIF if it has 20 chars to get
# the plain MAC address. The hardware type prefix has length 3, e.g. "01-".
if [ -n "${BOOTIF}" ] && [ ${#BOOTIF} -eq 20 ]; then
BOOTIF="${BOOTIF#???}"
BOOTIF="${BOOTIF//-/:}"
fi
readonly BOOTIF
## KCL "ip": is expected in following format (syslinux IPAPPEND3):
declare -rg IPCONF="$(getarg ip=)"
# <CLIENT_IP>:<PXE_SERVER_IP>:<GATEWAY_IP>:<NETMASK>
declare -g CLIENT_IP=
declare -g SERVER_IP=
declare -g GATEWAY_IP=
declare -g NETMASK=
read -r CLIENT_IP SERVER_IP GATEWAY_IP NETMASK \
<<< $( awk -F: '{print $1" "$2" "$3" "$4}' <<< "${IPCONF}" )
readonly CLIENT_IP SERVER_IP GATEWAY_IP NETMASK
# Calculate routing prefix from netmask
declare -rg ROUTING_PREFIX="$(ipcalc -s -p "$CLIENT_IP" "$NETMASK")"
# KCL "hostname"
declare -rg HOSTNAME="$(getarg hostname=)"
[ -n "$HOSTNAME" ] && echo "$HOSTNAME" > /proc/sys/kernel/hostname
# KCL "dns"
declare -rg DNS="$(getarg dns=)"
# KCL "domain"
declare -rg DOMAIN="$(getarg domain=)"
# VLAN tag
declare -rg VLAN="$(getarg vlan=)"
if [ -n "$VLAN" ]; then
modprobe 8021q || warn "VLAN mode detected but failed to load 8021q!"
fi
# Bridged mode?
grep -wqE 'bridged' /proc/cmdline && declare -rg BRIDGED="y"
}
save_network_config() {
cat <<-EOF > "${RUNTIME_CONF}"
SLX_PXE_CLIENT_IP='${CLIENT_IP}'
SLX_PXE_SERVER_IP='${SERVER_IP}'
SLX_PXE_GATEWAY='${GATEWAY_IP}'
SLX_PXE_NETMASK='${NETMASK}'
SLX_PXE_MAC='${BOOTIF}'
SLX_PXE_NETIF='${BOOTIF_NAME}'
SLX_PXE_DNS='${DNS}'
SLX_PXE_HOSTNAME='${HOSTNAME}'
SLX_PXE_DOMAIN='${DOMAIN}'
SLX_BRIDGE='${BRIDGED:+${BRIDGE_NAME}}'
SLX_VLAN_ID='${VLAN}'
EOF
}
# Create udev rule to rename the PXE boot interface to BOOTIF_NAME
create_udev_bootif_name_rule() {
if [ -z "${BOOTIF}" ]; then
echo "No BOOTIF set, was it present in the kernel command line?"
return 1
fi
# priority 70 < 80-net-name-slot.rules.
echo 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="'${BOOTIF}'", NAME="'${BOOTIF_NAME}'"' > /etc/udev/rules.d/70-pxe-boot-interface.rules
}
## MAIN ##
# Get IP config from KCL
parse_kernel_command_line
# Save network config for later use
save_network_config &
# Create the udev rule to rename the boot interface to the declared BOOTIF_NAME
create_udev_bootif_name_rule &
/sbin/initqueue --settled /usr/local/bin/setup-bootif-network
/sbin/initqueue --finished [ -e "/.network" ]
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