/usr/lib/dracut/modules.d/80fai-autodiscover/fai-scan.sh is in fai-nfsroot 5.3.6ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | #!/bin/bash
# autodiscover of the FAI server
# (c) Thomas Lange 2015
. /lib/dracut-lib.sh
if ! getargbool 0 fai.discover; then
return
fi
port=$(getarg fai.port=)
[ -z ${port} ] && port=4711 # default value
export FAI_MONITOR_PORT=$port
# this script is called with all network interfaces
nic=$1
ivar=/run/initramfs/fai-variables
declare -a faisrv
declare -A version
declare -a para
scan_net() {
# scan local network for FAI server
local iprange=$1
shift
local port=$1
local iplist
local host
iplist=$(nmap -n -e $nic --host-timeout 10 --open -oG - -p $port $iprange 2>/dev/null | grep -v '#' | cut -d' ' -f2 | sort -n | uniq)
# check all IPs, if a faiserver is listening there
for host in $iplist; do
getvar FAI_VERSION $host
if [ -n "$FAI_VERSION" ]; then
faiserver+=" $host"
version[$host]="$FAI_VERSION"
fi
done
}
getvar() {
# get a variable from the fai-monitor
# use $monserver and $FAI_MONITOR_PORT is no arguments are used
local ret
local srv
local var
local port
var=$1; shift
srv=$1; shift
port=$1; shift
: ${port:=$FAI_MONITOR_PORT}
: ${srv:=$monserver}
ret=$(echo "VARIABLE $var" | nc $srv $port)
if [[ $ret =~ ^OK\ ]]; then
val=${ret#OK }
eval $var=\$val
else
eval "$var="
fi
}
iprange=$(ip addr show up | grep -w 'inet'|grep -v 127.0.0.1| cut -d t -f 2 | cut -d ' ' -f 2 |head -1)
echo "Scanning $iprange for FAI server (port $FAI_MONITOR_PORT)"
while [ 1 ]; do
dialog --infobox "\n Scanning $iprange for FAI server (port $FAI_MONITOR_PORT)\n" 5 59
scan_net $iprange $FAI_MONITOR_PORT
faisrv=($faiserver)
if [ ${#faisrv[@]} -eq 0 ]; then
dialog --colors --yesno "\n \Zr\Z1No FAI server found.\Zn\n\n\n Retry scan?\n" 10 28
if [ $? -eq 1 ]; then
die "No FAI server found."
root=
return
fi
elif [ ${#faisrv[@]} -gt 1 ]; then
echo "More than one FAI server found."
# build parameter list for the menu
for i in "${faisrv[@]}"; do
# resolve IP to host name
hn=$(getent hosts $i)
hn=${hn#* }
hn=${hn%%.*}
str=$(printf "%-20s" $hn)
para+=("$i" "$str FAI ${version[$i]}")
done
exec 3>&1
selection=$(dialog --colors --no-cancel --menu " More than one server found. \n Please select a server:\n\n" 15 70 10 "${para[@]}" "Rescan" "Rescan the network" 2>&1 >&3)
if [ "$selection" = "Rescan" ]; then
faiserver=""
para=()
unset version
declare -A version
else
# one server was selected
monserver=${selection}
break
fi
else
# we found excatly one FAI server
monserver=${faisrv[0]}
break
fi
done
FAI_VERSION=${version[$monserver]}
getvar FAI_FLAGS
getvar NFSROOT
getvar FAI_CONFIG_SRC
if [ -z "FAI_CONFIG_SRC" ]; then
getvar FAI_CONFIGDIR
FAI_CONFIG_SRC="nfs://$monserver/$FAI_CONFIGDIR"
fi
dialog --infobox "\n\n FAI server $FAI_VERSION found at $monserver\n\n Using root=$monserver:$NFSROOT\n" 9 50
sleep 4
root=$monserver:$NFSROOT
netroot=nfs:$monserver:$NFSROOT:
echo "root=$root"
echo "FAI_VERSION=$FAI_VERSION" >> $ivar
echo FAI_FLAGS=$FAI_FLAGS >> $ivar
echo "root=$monserver:$NFSROOT" >> $ivar
echo "monserver=$monserver" >> $ivar
echo "FAI_CONFIG_SRC=$FAI_CONFIG_SRC" >> $ivar
# Done, all good!
rootok=1
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