dhcp-dhclient-script

   1 #!/bin/sh
   2 # dhclient-script for Linux. Dan Halbert, March, 1997.
   3 # Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
   4
   5 # Notes:
   6
   7 # 0. This script is based on the netbsd script supplied with dhcp-970306.
   8
   9 # 1. This script was modified to work with iproute2
  10
  11 if [ -n "$dhc_dbus" -a -x /usr/bin/dbus-send ]; then
  12         /usr/bin/dbus-send \
  13                 --system \
  14                 --dest=com.redhat.dhcp \
  15                 --type=method_call \
  16                 /com/redhat/dhcp/$interface \
  17                 com.redhat.dhcp.set \
  18                 'string:'"$(unset PATH SHLVL _ PWD dhc_dbus ; env)"
  19
  20         if [ $(($dhc_dbus & 31)) -eq 31 ]; then
  21                 exit 0
  22         fi
  23 fi
  24
  25 calc_prefix()
  26 {
  27         local old_IFS=$IFS
  28         IFS='.'
  29         local netmask=$(echo $1)
  30         IFS=$old_IFS
  31
  32         local ret=0
  33         local endp=0
  34         for n in $netmask ; do
  35                 for i in 128 64 32 16 8 4 2 1 ; do
  36                         if [ $(($n & $i)) -ne 0 ]; then
  37                                 if [ $endp -eq 0 ]; then
  38                                         ret=$(($ret + 1))
  39                                 else
  40                                         echo "32"
  41                                         return
  42                                 fi
  43                         else
  44                                 endp=1
  45                         fi
  46                 done
  47         done
  48         echo $ret
  49 }
  50
  51 make_resolv_conf() {
  52         if [ -n "$new_domain_name_servers" ]; then
  53                 :> /etc/resolv.conf.dhclient
  54                 chmod 644 /etc/resolv.conf.dhclient
  55                 if [ -n "$new_domain_search" ]; then
  56                         echo search $new_domain_search >> /etc/resolv.conf.dhclient
  57                 elif [ -n "$new_domain_name" ]; then
  58                         # Note that the DHCP 'Domain Name Option' is really just a domain
  59                         # name, and that this practice of using the domain name option as
  60                         # a search path is both nonstandard and deprecated.
  61                         echo search $new_domain_name >> /etc/resolv.conf.dhclient
  62                 fi
  63                 for nameserver in $new_domain_name_servers; do
  64                         echo nameserver $nameserver >>/etc/resolv.conf.dhclient
  65                 done
  66                 mv /etc/resolv.conf.dhclient /etc/resolv.conf
  67         elif [ -n "${new_dhcp6_name_servers}" ] ; then
  68                 :> /etc/resolv.conf.dhclient6
  69                 chmod 644 /etc/resolv.conf.dhclient6
  70
  71                 if [ "x${new_dhcp6_domain_search}" != x ] ; then
  72                         echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
  73                 fi
  74                 for nameserver in ${new_dhcp6_name_servers} ; do
  75                         echo nameserver ${nameserver} >> /etc/resolv.conf.dhclient6
  76                 done
  77                 mv /etc/resolv.conf.dhclient6 /etc/resolv.conf
  78         fi
  79 }
  80
  81 # Must be used on exit.
  82 # Invokes the local dhcp client exit hooks, if any.
  83 exit_with_hooks() {
  84         exit_status=$1
  85         if [ -f /etc/dhclient-exit-hooks ]; then
  86                 . /etc/dhclient-exit-hooks
  87         fi
  88         # probably should do something with exit status of the local script
  89         exit $exit_status
  90 }
  91
  92
  93 # Invoke the local dhcp client enter hooks, if they exist.
  94 if [ -f /etc/dhclient-enter-hooks ]; then
  95         exit_status=0
  96         . /etc/dhclient-enter-hooks
  97         # allow the local script to abort processing of this state
  98         # local script must set exit_status variable to nonzero.
  99         if [ $exit_status -ne 0 ]; then
 100                 exit $exit_status
 101         fi
 102 fi
 103
 104 ###
 105 ### DHCPv4 Handlers
 106 ###
 107
 108 if [ -n "$new_broadcast_address" ]; then
 109         new_broadcast_arg="broadcast $new_broadcast_address"
 110 fi
 111 if [ -n "$old_broadcast_address" ]; then
 112         old_broadcast_arg="broadcast $old_broadcast_address"
 113 fi
 114 if [ -n "$new_subnet_mask" ]; then
 115         new_subnet_arg="$(calc_prefix $new_subnet_mask)"
 116 fi
 117 if [ -n "$old_subnet_mask" ]; then
 118         old_subnet_arg="$(calc_prefix $old_subnet_mask)"
 119 fi
 120 if [ -n "$alias_subnet_mask" ]; then
 121         alias_subnet_arg="$(calc_prefix $alias_subnet_mask)"
 122 fi
 123 [ -z "new_subnet_arg" ] && $new_subnet_arg="32"
 124 [ -z "old_subnet_arg" ] && $old_subnet_arg="32"
 125 [ -z "alias_subnet_arg" ] && $alias_subnet_arg="32"
 126
 127 case "$reason" in
 128   MEDIUM)
 129         # Linux doesn't do mediums (ok, ok, media).
 130         ;;
 131
 132   PREINIT)
 133         if [ -n "$alias_ip_address" ]; then
 134                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 135         fi
 136         /sbin/ip link set $interface up
 137
 138         # We need to give the kernel some time to get the interface up.
 139         sleep 1
 140         ;;
 141
 142   BOUND|RENEW|REBIND|REBOOT)
 143         current_hostname=`hostname`
 144         if [ -z "$current_hostname" ]; then
 145                 hostname $new_host_name
 146         elif [ "$current_hostname" = "$old_host_name" -a \
 147                "$new_host_name" != "$old_host_name" ]; then
 148                 hostname $new_host_name
 149         fi
 150
 151         if [ -n "$old_ip_address" -a -n "$alias_ip_address" -a \
 152              "$alias_ip_address" != "$old_ip_address" ]; then
 153                 # Possible new alias. Remove old alias.
 154                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 155         fi
 156         if [ -n "$old_ip_address" -a "$old_ip_address" != "$new_ip_address" ]; then
 157                 # IP address changed.
 158                 /sbin/ip addr del $old_ip_address/$old_subnet_arg dev $interface
 159                 for router in $old_routers; do
 160                         /sbin/ip route del default via $router
 161                 done
 162                 if [ -n "$old_static_routes" ]; then
 163                         set -- $old_static_routes
 164                         while [ $# -gt 1 ]; do
 165                                 /sbin/ip route del $1 via $2
 166                                 shift; shift
 167                         done
 168                 fi
 169         fi
 170         if [ -z "$old_ip_address" -o "$old_ip_address" != "$new_ip_address" -o \
 171              "$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then
 172                 /sbin/ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg dev $interface
 173                 # Add a network route to the computed network address.
 174                 for router in $new_routers; do
 175                         /sbin/ip route add default via $router
 176                 done
 177                 if [ -n "$new_static_routes" ]; then
 178                         set -- $new_static_routes
 179                         while [ $# -gt 1 ]; do
 180                                 /sbin/ip route add $1 via $2
 181                                 shift; shift
 182                         done
 183                 fi
 184         fi
 185         if [ -n "$alias_ip_address" -a "$new_ip_address" != "$alias_ip_address" ]; then
 186                 /sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
 187         fi
 188         make_resolv_conf
 189         ;;
 190
 191   EXPIRE|FAIL|RELEASE|STOP)
 192         if [ -n "$alias_ip_address" ]; then
 193                 # Turn off alias interface.
 194                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 195         fi
 196         if [ -n "$old_ip_address" ]; then
 197                 /sbin/ip addr del $old_ip_address/$old_subnet_arg dev $interface
 198                 for router in $old_routers; do
 199                         /sbin/ip route del default via $router
 200                 done
 201                 if [ -n "$old_static_routes" ]; then
 202                         set -- $old_static_routes
 203                         while [ $# -gt 1 ]; do
 204                                 /sbin/ip route del $1 via $2
 205                                 shift; shift
 206                         done
 207                 fi
 208         fi
 209         if [ -n "$alias_ip_address" ]; then
 210                 /sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
 211         fi
 212         ;;
 213
 214   TIMEOUT)
 215         if [ -n "$alias_ip_address" ]; then
 216                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 217         fi
 218         /sbin/ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg dev $interface
 219
 220         set $new_routers
 221         if ping -q -c 1 $1; then
 222                 if [ "$new_ip_address" != "$alias_ip_address" ] && \
 223                    [ -n "$alias_ip_address" ]; then
 224                         /sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
 225                 fi
 226                 for router in $new_routers; do
 227                         /sbin/ip route add default via $router
 228                 done
 229                 if [ -n "$new_static_routes" ]; then
 230                         set -- $new_static_routes
 231                         while [ $# -gt 1 ]; do
 232                                 /sbin/ip route add $1 via $2
 233                                 shift; shift
 234                         done
 235                 fi
 236                 make_resolv_conf
 237                 exit_with_hooks 0
 238         fi
 239
 240         /sbin/ip addr del $new_ip_address/$new_subnet_arg dev $interface
 241         for router in $old_routers; do
 242                 /sbin/ip route del default via $router
 243         done
 244         if [ -n "$old_static_routes" ]; then
 245                 set -- $old_static_routes
 246                 while [ $# -gt 1 ]; do
 247                         /sbin/ip route del $1 via $2
 248                         shift; shift
 249                 done
 250         fi
 251         exit_with_hooks 1
 252         ;;
 253
 254   PREINIT6)
 255         # Ensure interface is up.
 256         /sbin/ip link set ${interface} up
 257
 258         # Remove any stale addresses from aborted clients.
 259         /sbin/ip -f inet6 addr flush dev ${interface} scope global permanent
 260
 261         exit_with_hooks 0
 262         ;;
 263   BOUND6)
 264         if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
 265                 exit_with_hooks 2;
 266         fi
 267
 268         /sbin/ip -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
 269         dev ${interface} scope global
 270
 271         # Check for nameserver options.
 272         make_resolv_conf
 273
 274         exit_with_hooks 0
 275         ;;
 276
 277   RENEW6|REBIND6)
 278         # Make sure nothing has moved around on us.
 279
 280         # Nameservers/domains/etc.
 281         if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
 282                 [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
 283                 make_resolv_conf
 284         fi
 285
 286         exit_with_hooks 0
 287         ;;
 288
 289   DEPREF6)
 290         if [ x${new_ip6_prefixlen} = x ] ; then
 291                 exit_with_hooks 2;
 292         fi
 293
 294         # There doesn't appear to be a way to update an addr to indicate
 295         # preference.
 296         #  /sbin/ip -f inet6 addr ??? ${new_ip6_address}/${new_ip6_prefixlen} \
 297         #       dev ${interface} scope global deprecated?
 298
 299         exit_with_hooks 0
 300         ;;
 301
 302   EXPIRE6|RELEASE6|STOP6)
 303         if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
 304                 exit_with_hooks 2;
 305         fi
 306
 307         /sbin/ip -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
 308         dev ${interface}
 309
 310         exit_with_hooks 0
 311         ;;
 312
 313   *)
 314         ;;
 315 esac
 316
 317 exit_with_hooks 0