scripts/boot/networking.sh

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