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=$1
  85
  86         for i in /etc/dhclient-exit-hooks.d/*[!~,] ; do
  87                 [ -f "$i" ] || continue
  88                 # Don't run *.{rpmsave,rpmorig,rpmnew,swp} scripts
  89                 [ "${i%.rpmsave}" != "${i}" ] && continue
  90                 [ "${i%.rpmorig}" != "${i}" ] && continue
  91                 [ "${i%.rpmnew}" != "${i}" ] && continue
  92                 [ "${i%.swp}" != "${i}" ] && continue
  93                 [ "${i%,v}" != "${i}" ] && continue
  94
  95                 . ${i}
  96         done
  97         # probably should do something with exit status of the local script
  98         exit $exit_status
  99 }
 100
 101 exit_status=0
 102 for i in /etc/dhclient-enter-hooks.d/*[!~,] ; do
 103         [ -f "$i" ] || continue
 104         # Don't run *.{rpmsave,rpmorig,rpmnew,swp} scripts
 105         [ "${i%.rpmsave}" != "${i}" ] && continue
 106         [ "${i%.rpmorig}" != "${i}" ] && continue
 107         [ "${i%.rpmnew}" != "${i}" ] && continue
 108         [ "${i%.swp}" != "${i}" ] && continue
 109         [ "${i%,v}" != "${i}" ] && continue
 110
 111         . ${i}
 112
 113         if [ $exit_status -ne 0 ]; then
 114                 exit $exit_status
 115         fi
 116 done
 117
 118 ###
 119 ### DHCPv4 Handlers
 120 ###
 121
 122 if [ -n "$new_broadcast_address" ]; then
 123         new_broadcast_arg="broadcast $new_broadcast_address"
 124 fi
 125 if [ -n "$old_broadcast_address" ]; then
 126         old_broadcast_arg="broadcast $old_broadcast_address"
 127 fi
 128 if [ -n "$new_subnet_mask" ]; then
 129         new_subnet_arg="$(calc_prefix $new_subnet_mask)"
 130 fi
 131 if [ -n "$old_subnet_mask" ]; then
 132         old_subnet_arg="$(calc_prefix $old_subnet_mask)"
 133 fi
 134 if [ -n "$alias_subnet_mask" ]; then
 135         alias_subnet_arg="$(calc_prefix $alias_subnet_mask)"
 136 fi
 137 [ -z "new_subnet_arg" ] && $new_subnet_arg="32"
 138 [ -z "old_subnet_arg" ] && $old_subnet_arg="32"
 139 [ -z "alias_subnet_arg" ] && $alias_subnet_arg="32"
 140
 141 case "$reason" in
 142   MEDIUM)
 143         # Linux doesn't do mediums (ok, ok, media).
 144         ;;
 145
 146   PREINIT)
 147         if [ -n "$alias_ip_address" ]; then
 148                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 149         fi
 150         /sbin/ip link set $interface up
 151
 152         # We need to give the kernel some time to get the interface up.
 153         sleep 1
 154         ;;
 155
 156   BOUND|RENEW|REBIND|REBOOT)
 157         current_hostname=`hostname`
 158         if [ -z "$current_hostname" ]; then
 159                 hostname $new_host_name
 160         elif [ "$current_hostname" = "$old_host_name" -a \
 161                "$new_host_name" != "$old_host_name" ]; then
 162                 hostname $new_host_name
 163         fi
 164
 165         if [ -n "$old_ip_address" -a -n "$alias_ip_address" -a \
 166              "$alias_ip_address" != "$old_ip_address" ]; then
 167                 # Possible new alias. Remove old alias.
 168                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 169         fi
 170         if [ -n "$old_ip_address" -a "$old_ip_address" != "$new_ip_address" ]; then
 171                 # IP address changed.
 172                 /sbin/ip addr del $old_ip_address/$old_subnet_arg dev $interface
 173                 for router in $old_routers; do
 174                         /sbin/ip route del default via $router
 175                 done
 176                 if [ -n "$old_static_routes" ]; then
 177                         set -- $old_static_routes
 178                         while [ $# -gt 1 ]; do
 179                                 /sbin/ip route del $1 via $2
 180                                 shift; shift
 181                         done
 182                 fi
 183         fi
 184         if [ -z "$old_ip_address" -o "$old_ip_address" != "$new_ip_address" -o \
 185              "$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then
 186                 /sbin/ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg dev $interface
 187                 # Add a network route to the computed network address.
 188                 for router in $new_routers; do
 189                         /sbin/ip route add default via $router
 190                 done
 191                 if [ -n "$new_static_routes" ]; then
 192                         set -- $new_static_routes
 193                         while [ $# -gt 1 ]; do
 194                                 /sbin/ip route add $1 via $2
 195                                 shift; shift
 196                         done
 197                 fi
 198         fi
 199         if [ -n "$alias_ip_address" -a "$new_ip_address" != "$alias_ip_address" ]; then
 200                 /sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
 201         fi
 202         make_resolv_conf
 203         ;;
 204
 205   EXPIRE|FAIL|RELEASE|STOP)
 206         if [ -n "$alias_ip_address" ]; then
 207                 # Turn off alias interface.
 208                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 209         fi
 210         if [ -n "$old_ip_address" ]; then
 211                 /sbin/ip addr del $old_ip_address/$old_subnet_arg dev $interface
 212                 for router in $old_routers; do
 213                         /sbin/ip route del default via $router
 214                 done
 215                 if [ -n "$old_static_routes" ]; then
 216                         set -- $old_static_routes
 217                         while [ $# -gt 1 ]; do
 218                                 /sbin/ip route del $1 via $2
 219                                 shift; shift
 220                         done
 221                 fi
 222         fi
 223         if [ -n "$alias_ip_address" ]; then
 224                 /sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
 225         fi
 226         ;;
 227
 228   TIMEOUT)
 229         if [ -n "$alias_ip_address" ]; then
 230                 /sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
 231         fi
 232         /sbin/ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg dev $interface
 233
 234         set $new_routers
 235         if ping -q -c 1 $1; then
 236                 if [ "$new_ip_address" != "$alias_ip_address" ] && \
 237                    [ -n "$alias_ip_address" ]; then
 238                         /sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
 239                 fi
 240                 for router in $new_routers; do
 241                         /sbin/ip route add default via $router
 242                 done
 243                 if [ -n "$new_static_routes" ]; then
 244                         set -- $new_static_routes
 245                         while [ $# -gt 1 ]; do
 246                                 /sbin/ip route add $1 via $2
 247                                 shift; shift
 248                         done
 249                 fi
 250                 make_resolv_conf
 251                 exit_with_hooks 0
 252         fi
 253
 254         /sbin/ip addr del $new_ip_address/$new_subnet_arg dev $interface
 255         for router in $old_routers; do
 256                 /sbin/ip route del default via $router
 257         done
 258         if [ -n "$old_static_routes" ]; then
 259                 set -- $old_static_routes
 260                 while [ $# -gt 1 ]; do
 261                         /sbin/ip route del $1 via $2
 262                         shift; shift
 263                 done
 264         fi
 265         exit_with_hooks 1
 266         ;;
 267
 268   PREINIT6)
 269         # Ensure interface is up.
 270         /sbin/ip link set ${interface} up
 271
 272         # Remove any stale addresses from aborted clients.
 273         /sbin/ip -f inet6 addr flush dev ${interface} scope global permanent
 274
 275         exit_with_hooks 0
 276         ;;
 277   BOUND6)
 278         if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
 279                 exit_with_hooks 2;
 280         fi
 281
 282         /sbin/ip -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
 283         dev ${interface} scope global
 284
 285         # Check for nameserver options.
 286         make_resolv_conf
 287
 288         exit_with_hooks 0
 289         ;;
 290
 291   RENEW6|REBIND6)
 292         # Make sure nothing has moved around on us.
 293
 294         # Nameservers/domains/etc.
 295         if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
 296                 [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
 297                 make_resolv_conf
 298         fi
 299
 300         exit_with_hooks 0
 301         ;;
 302
 303   DEPREF6)
 304         if [ x${new_ip6_prefixlen} = x ] ; then
 305                 exit_with_hooks 2;
 306         fi
 307
 308         # There doesn't appear to be a way to update an addr to indicate
 309         # preference.
 310         #  /sbin/ip -f inet6 addr ??? ${new_ip6_address}/${new_ip6_prefixlen} \
 311         #       dev ${interface} scope global deprecated?
 312
 313         exit_with_hooks 0
 314         ;;
 315
 316   EXPIRE6|RELEASE6|STOP6)
 317         if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
 318                 exit_with_hooks 2;
 319         fi
 320
 321         /sbin/ip -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
 322         dev ${interface}
 323
 324         exit_with_hooks 0
 325         ;;
 326
 327   *)
 328         ;;
 329 esac
 330
 331 exit_with_hooks 0