scripts/boot/networking.sh

   1 #!/bin/sh
   2
   3 #set -e
   4
   5 do_netsetup ()
   6 {
   7         modprobe -q af_packet # For DHCP
   8
   9         udevadm trigger
  10         udevadm settle
  11
  12         [ -n "$ETHDEV_TIMEOUT" ] || ETHDEV_TIMEOUT=15
  13         echo "Using timeout of $ETHDEV_TIMEOUT seconds for network configuration."
  14
  15         if [ -z "${NETBOOT}" ] && [ -z "${FETCH}" ] && \
  16            [ -z "${HTTPFS}" ] && [ -z "${FTPFS}" ]
  17         then
  18
  19
  20         # support for Syslinux IPAPPEND parameter
  21         # it sets the BOOTIF variable on the kernel parameter
  22
  23         if [ -n "${BOOTIF}" ]
  24         then
  25                 # pxelinux sets BOOTIF to a value based on the mac address of the
  26                 # network card used to PXE boot, so use this value for DEVICE rather
  27                 # than a hard-coded device name from initramfs.conf. this facilitates
  28                 # network booting when machines may have multiple network cards.
  29                 # pxelinux sets BOOTIF to 01-$mac_address
  30
  31                 # strip off the leading "01-", which isn't part of the mac
  32                 # address
  33                 temp_mac=${BOOTIF#*-}
  34
  35                 # convert to typical mac address format by replacing "-" with ":"
  36                 bootif_mac=""
  37                 IFS='-'
  38                 for x in $temp_mac
  39                 do
  40                         if [ -z "$bootif_mac" ]
  41                         then
  42                                 bootif_mac="$x"
  43                         else
  44                                 bootif_mac="$bootif_mac:$x"
  45                         fi
  46                 done
  47                 unset IFS
  48
  49                 # look for devices with matching mac address, and set DEVICE to
  50                 # appropriate value if match is found.
  51
  52                 for device in /sys/class/net/*
  53                 do
  54                         if [ -f "$device/address" ]
  55                         then
  56                                 current_mac=$(cat "$device/address")
  57
  58                                 if [ "$bootif_mac" = "$current_mac" ]
  59                                 then
  60                                         DEVICE=${device##*/}
  61                                         break
  62                                 fi
  63                         fi
  64                 done
  65         fi
  66
  67         # if ethdevice was not specified on the kernel command line
  68         # make sure we try to get a working network configuration
  69         # for *every* present network device (except for loopback of course)
  70         if [ -z "$ETHDEVICE" ] ; then
  71                 echo "If you want to boot from a specific device use bootoption ethdevice=..."
  72                 for device in /sys/class/net/*; do
  73                         dev=${device##*/} ;
  74                         if [ "$dev" != "lo" ] ; then
  75                                 ETHDEVICE="$ETHDEVICE $dev"
  76                         fi
  77                 done
  78         fi
  79
  80         # split args of ethdevice=eth0,eth1 into "eth0 eth1"
  81         for device in $(echo $ETHDEVICE | sed 's/,/ /g') ; do
  82                 devlist="$devlist $device"
  83         done
  84
  85         # this is tricky (and ugly) because ipconfig sometimes just hangs/runs into
  86         # an endless loop; if execution fails give it two further tries, that's
  87         # why we use '$devlist $devlist $devlist' for the other for loop
  88         for dev in $devlist $devlist $devlist ; do
  89                 echo "Executing ipconfig -t $ETHDEV_TIMEOUT $dev"
  90                 ipconfig -t "$ETHDEV_TIMEOUT" $dev | tee -a /netboot.config &
  91                 jobid=$!
  92                 sleep "$ETHDEV_TIMEOUT" ; sleep 1
  93                 if [ -r /proc/"$jobid"/status ] ; then
  94                         echo "Killing job $jobid for device $dev as ipconfig ran into recursion..."
  95                         kill -9 $jobid
  96                 fi
  97
  98                 # if configuration of device worked we should have an assigned
  99                 # IP address, if so let's use the device as $DEVICE for later usage.
 100                 # simple and primitive approach which seems to work fine
 101                 if ifconfig $dev | grep -q 'inet.*addr:' ; then
 102                         export DEVICE="$dev"
 103                         break
 104                 fi
 105         done
 106
 107         else
 108                 for interface in ${DEVICE}; do
 109                         ipconfig -t "$ETHDEV_TIMEOUT" ${interface} | tee /netboot-${interface}.config
 110                         [ -e /tmp/net-${interface}.conf ] && . /tmp/net-${interface}.conf
 111                         if [ "$IPV4ADDR" != "0.0.0.0" ]
 112                         then
 113                                 break
 114                         fi
 115                 done
 116         fi
 117
 118         for interface in ${DEVICE}; do
 119                 # source relevant ipconfig output
 120                 OLDHOSTNAME=${HOSTNAME}
 121                 [ -e /tmp/net-${interface}.conf ] && . /tmp/net-${interface}.conf
 122                 [ -z ${HOSTNAME} ] && HOSTNAME=${OLDHOSTNAME}
 123                 export HOSTNAME
 124
 125                 if [ -n "${interface}" ]
 126                 then
 127                         HWADDR="$(cat /sys/class/net/${interface}/address)"
 128                 fi
 129
 130                 if [ ! -e "/etc/resolv.conf" ]
 131                 then
 132                         echo "Creating /etc/resolv.conf"
 133
 134                         if [ -n "${DNSDOMAIN}" ]
 135                         then
 136                                 echo "domain ${DNSDOMAIN}" > /etc/resolv.conf
 137                                 echo "search ${DNSDOMAIN}" >> /etc/resolv.conf
 138                         fi
 139
 140                         for i in ${IPV4DNS0} ${IPV4DNS1} ${IPV4DNS1}
 141                         do
 142                                 if [ -n "$i" ] && [ "$i" != 0.0.0.0 ]
 143                                 then
 144                                         echo "nameserver $i" >> /etc/resolv.conf
 145                                 fi
 146                         done
 147                 fi
 148
 149                 # Check if we have a network device at all
 150                 if ! ls /sys/class/net/"$interface" > /dev/null 2>&1 && \
 151                    ! ls /sys/class/net/eth0 > /dev/null 2>&1 && \
 152                    ! ls /sys/class/net/wlan0 > /dev/null 2>&1 && \
 153                    ! ls /sys/class/net/ath0 > /dev/null 2>&1 && \
 154                    ! ls /sys/class/net/ra0 > /dev/null 2>&1
 155                 then
 156                         panic "No supported network device found, maybe a non-mainline driver is required."
 157                 fi
 158         done
 159 }