modules.d/40network/dhclient-script.sh

   1 #!/bin/sh
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4
   5 setup_interface() {
   6     ip=$new_ip_address
   7     mtu=$new_interface_mtu
   8     mask=$new_subnet_mask
   9     bcast=$new_broadcast_address
  10     gw=${new_routers%%,*}
  11     domain=$new_domain_name
  12     search=$(printf "$new_domain_search")
  13     namesrv=$new_domain_name_servers
  14     hostname=$new_host_name
  15
  16     [ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override
  17
  18     # Taken from debian dhclient-script:
  19     # The 576 MTU is only used for X.25 and dialup connections
  20     # where the admin wants low latency.  Such a low MTU can cause
  21     # problems with UDP traffic, among other things.  As such,
  22     # disallow MTUs from 576 and below by default, so that broken
  23     # MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
  24     if [ -n "$mtu" ] && [ $mtu -gt 576 ] ; then
  25         echo "if ! ip link set $netif mtu $mtu ; then"
  26         echo "ip link set $netif down"
  27         echo "ip link set $netif mtu $mtu"
  28         echo "ip link set $netif up"
  29         echo wait_for_if_up $netif
  30         echo "fi"
  31     fi > /tmp/net.$netif.up
  32
  33     echo ip addr add $ip${mask:+/$mask} ${bcast:+broadcast $bcast} dev $netif >> /tmp/net.$netif.up
  34
  35     [ -n "$gw" ] && echo ip route add default via $gw dev $netif > /tmp/net.$netif.gw
  36
  37     [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
  38     if  [ -n "$namesrv" ] ; then
  39         for s in $namesrv; do
  40             echo nameserver $s
  41         done
  42     fi >> /tmp/net.$netif.resolv.conf
  43
  44     # Note: hostname can be fqdn OR short hostname, so chop off any
  45     # trailing domain name and explicity add any domain if set.
  46     [ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
  47 }
  48
  49 PATH=/usr/sbin:/usr/bin:/sbin:/bin
  50
  51 export PS4="dhclient.$interface.$$ + "
  52 exec >>/run/initramfs/loginit.pipe 2>>/run/initramfs/loginit.pipe
  53 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
  54
  55 # We already need a set netif here
  56 netif=$interface
  57
  58 # Huh? Interface configured?
  59 [ -f "/tmp/net.$netif.up" ] && exit 0
  60
  61 case $reason in
  62     PREINIT)
  63         echo "dhcp: PREINIT $netif up"
  64         ip link set $netif up
  65         wait_for_if_up $netif
  66         ;;
  67     BOUND)
  68         echo "dhcp: BOND setting $netif"
  69         if ! arping -q -D -c 2 -I $netif $new_ip_address ; then
  70             warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying"
  71             exit 1
  72         fi
  73         setup_interface
  74         set | while read line; do
  75             [ "${line#new_}" = "$line" ] && continue
  76             echo "$line"
  77         done >/tmp/dhclient.$netif.dhcpopts
  78         echo online > /sys/class/net/$netif/uevent
  79
  80         if [ -e /tmp/net.$netif.manualup ]; then
  81             /sbin/netroot $netif -m
  82             rm -f /tmp/net.$netif.manualup
  83         else
  84             initqueue --onetime --name netroot-$netif netroot $netif
  85         fi
  86         ;;
  87     *) echo "dhcp: $reason";;
  88 esac
  89
  90 exit 0