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#!/bin/bash
#
# This script is triggered by udhcpc and handle the DHCP information
# given to this script as parameters.
export PATH=$PATH:/opt/openslx/sbin:/opt/openslx/bin
. /opt/openslx/config
if [ -z "$SLX_PXE_NETIF" ]; then
echo "Missing PXE network interface information."
exit 1
fi
MAIN_NETIF="$SLX_PXE_NETIF"
[ -n "$SLX_VLAN_ID" ] && MAIN_NETIF="${SLX_PXE_NETIF}.${SLX_VLAN_ID}"
[ -n "$SLX_BRIDGE" ] && MAIN_NETIF="$SLX_BRIDGE"
readonly MAIN_NETIF
RESOLV_CONF="/opt/openslx/resolv.conf"
THIS_RESOLV="/run/network/${MAIN_NETIF}.resolv"
rebuild_resolv_conf () {
# Don't do anything if the active resolv.conf is not ours
# Also this will not run resolvconf update.d... No idea if we should still do so...
[ -L "/etc/resolv.conf" ] || return 0
[ "x$(readlink "/etc/resolv.conf")" == "x${RESOLV_CONF}" ] || return 0
# Maybe make this smarter some time, if anyone is using clients that are on multiple networks at once etc...
# This is a little braindead but should work most of the time
sort -u /run/network/*.resolv > "$RESOLV_CONF" 2> /dev/null
# add support for resolv.conf update scripts // see man(8) resolvconf
for s in /etc/resolvconf/update.d/*.sh; do
[ -f "$s" ] && [ -x "$s" ] && "$s"
done
}
escape_search() {
echo "$@" | sed -e 's/[]\/()$*.^|[]/\\&/g'
}
escape_replace() {
echo "$@" | sed -e 's/[\/&]/\\&/g'
}
check_env() {
if [ -z "$ip" ] || [ -z "$subnet" ] || [ -z "$interface" ]; then
echo "$1 event with missing data" >&2
echo "ip = '$ip'" >&2
echo "subnet = '$subnet'" >&2
echo "interface = '$interface'" >&2
exit 1
fi
# only run for the boot network interface
# TODO VLAN support
if [ "$interface" != "$MAIN_NETIF" ]; then
echo "Ignoring '$interface'..."
exit 1
fi
}
case "$1" in
bound|renew)
check_env "$1"
# Set address on interface
ip addr add "$ip/$(ipcalc -s -p "$ip" "$subnet" | sed s/.*=//)" dev "$interface"
# Set default route, if given
if [ -n "$router" ]; then
ip route replace default via "$router"
fi
# get domain, hostname and thus fqdn from DNS
dns_fqdn=$(busybox timeout -t 3 rdns "$ip")
dns_short="${dns_fqdn%%.*}"
# check if it is fqdn
if [ "$dns_fqdn" == "$dns_short" ]; then
unset dns_fqdn dns_short
fi
# Update resolver configuration file
conf_file="$(mktemp)"
# Own domain suffix
if [ -n "$domain" ]; then
:
elif [ -n "$dns_fqdn" ]; then
domain="${dns_fqdn#*.}"
elif [ -n "$SLX_NET_DOMAIN" ]; then
domain="$SLX_NET_DOMAIN"
fi
if [ -n "$domain" ]; then
echo "domain ${domain%% *}" >> "${conf_file}"
fi
# Add domain to list of search domains if not in there yet
if [ -n "$domain" ] && [ -n "$search" ]; then
FOUND=no
for sd in $search; do
[ "x$sd" = "x$domain" ] && FOUND=yes
done
[ "$FOUND" = "no" ] && search="$domain $search"
elif [ -n "$domain" ]; then
search="$domain"
fi
# Search domains
if [ -n "$search" ]; then
echo "search $search" >> "${conf_file}"
elif [ -n "$SLX_NET_SEARCH" ]; then
echo "search $SLX_NET_SEARCH" >> "${conf_file}"
elif [ -n "$SLX_NET_DOMAIN" ]; then
echo "search $SLX_NET_DOMAIN" >> "${conf_file}"
fi
for i in $dns; do
echo "$0: Adding DNS $i"
echo "nameserver $i" >> "${conf_file}"
done
if [ -x "/sbin/resolvconf" ] && [ -L "/etc/resolv.conf" ] && [ -d "/etc/resolvconf/update.d" ]; then
# Automatic handling :-)
resolvconf --create-runtime-directories
resolvconf --enable-updates
< "$conf_file" resolvconf -a "${interface}.udhcpc"
rm -- "$conf_file"
else
# Manual handling required :-(
mv -f "$conf_file" "$THIS_RESOLV"
rebuild_resolv_conf
fi
# TODO: check if we really want/need to overwrite the PXE_IP,
# it might be better/clearer to change the SLX_DHCP_CLIENT_IP...
sed -i "s/^\(SLX_PXE_CLIENT_IP=\).*$/\1'$ip'/" /opt/openslx/config
# Write DOMAIN and SEARCH to /opt/openslx/config if empty
if [ -z "$SLX_NET_DOMAIN" ] && [ -n "$domain" ]; then
sed -i "/^SLX_NET_DOMAIN=/d" /opt/openslx/config
echo "SLX_NET_DOMAIN='$domain'" >> /opt/openslx/config
fi
if [ -z "$SLX_NET_SEARCH" ] && [ -n "$search" ]; then
sed -i "/^SLX_NET_SEARCH=/d" /opt/openslx/config
echo "SLX_NET_SEARCH='$search'" >> /opt/openslx/config
fi
# Same for WINS servers
if [ -z "$SLX_NET_WINS" ] && [ -n "$wins" ]; then
sed -i "/^SLX_NET_WINS=/d" /opt/openslx/config
echo "SLX_NET_WINS='$wins'" >> /opt/openslx/config
fi
# TODO find a better way to trigger additional code, hook dir?
# Update /etc/issue for proper spacing
[ -x "/opt/openslx/scripts/openslx-create_issue" ] && /opt/openslx/scripts/openslx-create_issue
# Remove any stray addresses; we expect the primary interface to only have one
# address supplied via DHCP. We do this after adding the new one, obviously.
rem_list=$( ip -o addr show "$interface" | awk '{ for (i=1;i<NF;++i) if ($i == "inet") print $(i+1) }' | grep -v "^${ip}/" )
if [ -n "$rem_list" ]; then
echo "PRIMARY: Removing $rem_list since we just got assigned $ip"
echo 1 > "/proc/sys/net/ipv4/conf/$interface/promote_secondaries"
for addr in $rem_list; do
ip addr del "$addr" dev "$interface"
sed -i "/^$(escape_search "${addr%/*}")(\s|$)/d" /etc/hosts
done
fi
# Write to openslx-config
echo "# Config written by openslx-dhcp-script (2)" >> /opt/openslx/config
sed -i "/^SLX_DNS=/d" /opt/openslx/config
echo "SLX_DNS='$dns'" >> /opt/openslx/config
;;
deconfig)
check_env "$1"
if [ "$interface" = "$primary" ]; then
echo "Ignoring deconfig for primary interface"
else
echo 1 > "/proc/sys/net/ipv4/conf/$interface/promote_secondaries"
clientip=${ip%%:*}
ip addr del "$clientip/$(ipcalc -s -p "$clientip" "$subnet" | sed s/.*=//)" dev "$interface"
sed -i "/^$(escape_search "$ip")(\s|$)/d" /etc/hosts
fi
if [ -x /sbin/resolvconf ] && [ -L /etc/resolv.conf ] && [ -d /etc/resolvconf/update.d ]; then
# Automatic handling :-)
resolvconf -d "${interface}.udhcpc"
else
# Manual handling required :-(
rm -f -- "$THIS_RESOLV"
rebuild_resolv_conf
fi
;;
leasefail)
echo "$0: Lease failed: $message" >&2
;;
nak)
echo "$0: Received a NAK: $message" >&2
;;
*)
echo "$0: Unknown udhcpc command: $1" >&2
exit 1
;;
esac
exit 0
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