modules.d/35network-legacy/dhclient-script.sh

   1 #!/bin/sh
   2
   3 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   4
   5 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   6 type ip_to_var >/dev/null 2>&1 || . /lib/net-lib.sh
   7
   8 # We already need a set netif here
   9 netif=$interface
  10
  11 setup_interface() {
  12     ip=$new_ip_address
  13     mtu=$new_interface_mtu
  14     mask=$new_subnet_mask
  15     bcast=$new_broadcast_address
  16     gw=${new_routers%%,*}
  17     domain=$new_domain_name
  18     search=$(printf -- "$new_domain_search")
  19     namesrv=$new_domain_name_servers
  20     hostname=$new_host_name
  21     [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
  22     [ -n "$new_max_life" ] && lease_time=$new_max_life
  23     preferred_lft=$lease_time
  24     [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
  25
  26     [ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override
  27
  28     # Taken from debian dhclient-script:
  29     # The 576 MTU is only used for X.25 and dialup connections
  30     # where the admin wants low latency.  Such a low MTU can cause
  31     # problems with UDP traffic, among other things.  As such,
  32     # disallow MTUs from 576 and below by default, so that broken
  33     # MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
  34     if [ -n "$mtu" ] && [ $mtu -gt 576 ] ; then
  35         if ! ip link set $netif mtu $mtu ; then
  36             ip link set $netif down
  37             ip link set $netif mtu $mtu
  38             linkup $netif
  39         fi
  40     fi
  41
  42     ip addr add $ip${mask:+/$mask} ${bcast:+broadcast $bcast} dev $netif \
  43         ${lease_time:+valid_lft $lease_time} \
  44         ${preferred_lft:+preferred_lft ${preferred_lft}}
  45
  46     if [ -n "$gw" ] ; then
  47         if [ "$mask" = "255.255.255.255" ] ; then
  48             # point-to-point connection => set explicit route to gateway
  49             echo ip route add $gw dev $netif > /tmp/net.$netif.gw
  50         fi
  51
  52         echo "$gw" | {
  53             IFS=' ' read -r main_gw other_gw
  54             echo ip route replace default via $main_gw dev $netif >> /tmp/net.$netif.gw
  55             if [ -n "$other_gw" ] ; then
  56                 for g in $other_gw; do
  57                     echo ip route add default via $g dev $netif >> /tmp/net.$netif.gw
  58                 done
  59             fi
  60         }
  61     fi
  62
  63     if getargbool 1 rd.peerdns; then
  64         [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
  65         if  [ -n "$namesrv" ] ; then
  66             for s in $namesrv; do
  67                 echo nameserver $s
  68             done
  69         fi >> /tmp/net.$netif.resolv.conf
  70     fi
  71     # Note: hostname can be fqdn OR short hostname, so chop off any
  72     # trailing domain name and explicity add any domain if set.
  73     [ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
  74 }
  75
  76 setup_interface6() {
  77     domain=$new_domain_name
  78     search=$(printf -- "$new_domain_search")
  79     namesrv=$new_domain_name_servers
  80     hostname=$new_host_name
  81     [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
  82     [ -n "$new_max_life" ] && lease_time=$new_max_life
  83     preferred_lft=$lease_time
  84     [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
  85
  86     [ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override
  87
  88     ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
  89         dev ${netif} scope global \
  90         ${lease_time:+valid_lft $lease_time} \
  91         ${preferred_lft:+preferred_lft ${preferred_lft}}
  92
  93     if getargbool 1 rd.peerdns; then
  94         [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
  95         if  [ -n "$namesrv" ] ; then
  96             for s in $namesrv; do
  97                 echo nameserver $s
  98             done
  99         fi >> /tmp/net.$netif.resolv.conf
 100     fi
 101
 102     # Note: hostname can be fqdn OR short hostname, so chop off any
 103     # trailing domain name and explicity add any domain if set.
 104     [ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
 105 }
 106
 107 parse_option_121() {
 108     while [ $# -ne 0 ]; do
 109         mask="$1"
 110         shift
 111
 112         # Is the destination a multicast group?
 113         if [ $1 -ge 224 -a $1 -lt 240 ]; then
 114             multicast=1
 115         else
 116             multicast=0
 117         fi
 118
 119         # Parse the arguments into a CIDR net/mask string
 120         if [ $mask -gt 24 ]; then
 121             destination="$1.$2.$3.$4/$mask"
 122             shift; shift; shift; shift
 123         elif [ $mask -gt 16 ]; then
 124             destination="$1.$2.$3.0/$mask"
 125             shift; shift; shift
 126         elif [ $mask -gt 8 ]; then
 127             destination="$1.$2.0.0/$mask"
 128             shift; shift
 129         else
 130             destination="$1.0.0.0/$mask"
 131             shift
 132         fi
 133
 134         # Read the gateway
 135         gateway="$1.$2.$3.$4"
 136         shift; shift; shift; shift
 137
 138         # Multicast routing on Linux
 139         #  - If you set a next-hop address for a multicast group, this breaks with Cisco switches
 140         #  - If you simply leave it link-local and attach it to an interface, it works fine.
 141         if [ $multicast -eq 1 ]; then
 142             temp_result="$destination dev $interface"
 143         else
 144             temp_result="$destination via $gateway dev $interface"
 145         fi
 146
 147         echo "/sbin/ip route add $temp_result"
 148     done
 149 }
 150
 151
 152 case $reason in
 153     PREINIT)
 154         echo "dhcp: PREINIT $netif up"
 155         linkup $netif
 156         ;;
 157
 158     PREINIT6)
 159         echo "dhcp: PREINIT6 $netif up"
 160         linkup $netif
 161         wait_for_ipv6_dad_link $netif
 162         ;;
 163
 164     BOUND)
 165         echo "dhcp: BOND setting $netif"
 166         unset layer2
 167         if [ -f /sys/class/net/$netif/device/layer2 ]; then
 168             read layer2 < /sys/class/net/$netif/device/layer2
 169         fi
 170         if [ "$layer2" != "0" ]; then
 171             if command -v arping2 >/dev/null; then
 172                 if arping2 -q -C 1 -c 2 -I $netif -0 $new_ip_address ; then
 173                     warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying"
 174                     exit 1
 175                 fi
 176             else
 177                 if ! arping -f -q -D -c 2 -I $netif $new_ip_address ; then
 178                     warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying"
 179                     exit 1
 180                 fi
 181             fi
 182         fi
 183         unset layer2
 184         setup_interface
 185         set | while read line || [ -n "$line" ]; do
 186             [ "${line#new_}" = "$line" ] && continue
 187             echo "$line"
 188         done >/tmp/dhclient.$netif.dhcpopts
 189
 190         {
 191             echo '. /lib/net-lib.sh'
 192             echo "setup_net $netif"
 193             if [ -n "$new_classless_static_routes" ]; then
 194                 OLDIFS="$IFS"
 195                 IFS=".$IFS"
 196                 parse_option_121 $new_classless_static_routes
 197                 IFS="$OLDIFS"
 198             fi
 199             echo "source_hook initqueue/online $netif"
 200             [ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif"
 201             echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
 202         } > $hookdir/initqueue/setup_net_$netif.sh
 203
 204         echo "[ -f /tmp/net.$netif.did-setup ]" > $hookdir/initqueue/finished/dhclient-$netif.sh
 205         >/tmp/net.$netif.up
 206         if [ -e /sys/class/net/${netif}/address ]; then
 207             > /tmp/net.$(cat /sys/class/net/${netif}/address).up
 208         fi
 209
 210         ;;
 211
 212     RENEW|REBIND)
 213         unset lease_time
 214         [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
 215         [ -n "$new_max_life" ] && lease_time=$new_max_life
 216         preferred_lft=$lease_time
 217         [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
 218         ip -4 addr change ${new_ip_address}/${new_subnet_mask} broadcast ${new_broadcast_address} dev ${interface} \
 219            ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \
 220            >/dev/null 2>&1
 221         ;;
 222
 223     BOUND6)
 224         echo "dhcp: BOND6 setting $netif"
 225         setup_interface6
 226
 227         set | while read line || [ -n "$line" ]; do
 228             [ "${line#new_}" = "$line" ] && continue
 229             echo "$line"
 230         done >/tmp/dhclient.$netif.dhcpopts
 231
 232         {
 233             echo '. /lib/net-lib.sh'
 234             echo "setup_net $netif"
 235             echo "source_hook initqueue/online $netif"
 236             [ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif"
 237             echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
 238         } > $hookdir/initqueue/setup_net_$netif.sh
 239
 240         echo "[ -f /tmp/net.$netif.did-setup ]" > $hookdir/initqueue/finished/dhclient-$netif.sh
 241         >/tmp/net.$netif.up
 242         if [ -e /sys/class/net/${netif}/address ]; then
 243             > /tmp/net.$(cat /sys/class/net/${netif}/address).up
 244         fi
 245         ;;
 246
 247     RENEW6|REBIND6)
 248         unset lease_time
 249         [ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
 250         [ -n "$new_max_life" ] && lease_time=$new_max_life
 251         preferred_lft=$lease_time
 252         [ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
 253         ip -6 addr change ${new_ip6_address}/${new_ip6_prefixlen} dev ${interface} scope global \
 254            ${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \
 255            >/dev/null 2>&1
 256         ;;
 257
 258     *) echo "dhcp: $reason";;
 259 esac
 260
 261 exit 0