net/isc-dhcp/files/dhclient-script

   1 #!/bin/sh
   2
   3 make_resolv_conf() {
   4   if [ x"$new_domain_name_servers" != x ]; then
   5     cat /dev/null > /etc/resolv.conf.dhclient
   6     chmod 644 /etc/resolv.conf.dhclient
   7     if [ x"$new_domain_search" != x ]; then
   8       echo search $new_domain_search >> /etc/resolv.conf.dhclient
   9     elif [ x"$new_domain_name" != x ]; then
  10       # Note that the DHCP 'Domain Name Option' is really just a domain
  11       # name, and that this practice of using the domain name option as
  12       # a search path is both nonstandard and deprecated.
  13       echo search $new_domain_name >> /etc/resolv.conf.dhclient
  14     fi
  15     for nameserver in $new_domain_name_servers; do
  16       echo nameserver $nameserver >>/etc/resolv.conf.dhclient
  17     done
  18
  19   elif [ "x${new_dhcp6_name_servers}" != x ] ; then
  20     cat /dev/null > /etc/resolv.conf.dhclient6
  21     chmod 644 /etc/resolv.conf.dhclient6
  22
  23     if [ "x${new_dhcp6_domain_search}" != x ] ; then
  24       echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
  25     fi
  26     for nameserver in ${new_dhcp6_name_servers} ; do
  27       echo nameserver ${nameserver} >> /etc/resolv.conf.dhclient6
  28     done
  29   fi
  30
  31   # if both v4 and v6 clients are running, concatenate results
  32   cat /etc/resolv.conf.* > /etc/resolv.conf
  33 }
  34
  35 # Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
  36 exit_with_hooks() {
  37   exit_status=$1
  38   if [ -f /etc/dhclient-exit-hooks ]; then
  39     . /etc/dhclient-exit-hooks
  40   fi
  41 # probably should do something with exit status of the local script
  42   exit $exit_status
  43 }
  44
  45 # Invoke the local dhcp client enter hooks, if they exist.
  46 if [ -f /etc/dhclient-enter-hooks ]; then
  47   exit_status=0
  48   . /etc/dhclient-enter-hooks
  49   # allow the local script to abort processing of this state
  50   # local script must set exit_status variable to nonzero.
  51   if [ $exit_status -ne 0 ]; then
  52     exit $exit_status
  53   fi
  54 fi
  55
  56 ###
  57 ### DHCPv4 Handlers
  58 ###
  59
  60 if [ x$new_broadcast_address != x ]; then
  61   new_broadcast_arg="broadcast $new_broadcast_address"
  62 fi
  63 if [ x$new_subnet_mask != x ]; then
  64   new_subnet_arg="netmask $new_subnet_mask"
  65 fi
  66 if [ x$alias_subnet_mask != x ]; then
  67   alias_subnet_arg="netmask $alias_subnet_mask"
  68 fi
  69
  70 if [ x$reason = xMEDIUM ]; then
  71   # Linux doesn't do mediums (ok, ok, media).
  72   exit_with_hooks 0
  73 fi
  74
  75 if [ x$reason = xPREINIT ]; then
  76   if [ x$alias_ip_address != x ]; then
  77     # Bring down alias interface. Its routes will disappear too.
  78     ifconfig $interface:0- 0.0.0.0
  79   fi
  80   ifconfig $interface 0.0.0.0 up
  81
  82   # We need to give the kernel some time to get the interface up.
  83   sleep 1
  84
  85   exit_with_hooks 0
  86 fi
  87
  88 if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
  89   exit_with_hooks 0
  90 fi
  91
  92 if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
  93    [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
  94   current_hostname=`hostname`
  95   if [ x$current_hostname = x ] || \
  96      [ x$current_hostname = x$old_host_name ]; then
  97     if [ x$current_hostname = x ] || \
  98        [ x$new_host_name != x$old_host_name ]; then
  99       hostname $new_host_name
 100     fi
 101   fi
 102
 103   if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
 104                 [ x$alias_ip_address != x$old_ip_address ]; then
 105     # Possible new alias. Remove old alias.
 106     ifconfig $interface:0- 0.0.0.0
 107   fi
 108   if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
 109     # IP address changed. Bringing down the interface will delete all routes,
 110     # and clear the ARP cache.
 111     ifconfig $interface 0.0.0.0 down
 112
 113   fi
 114   if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
 115      [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
 116
 117     ifconfig $interface $new_ip_address $new_subnet_arg \
 118                                                         $new_broadcast_arg
 119     for router in $new_routers; do
 120       if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
 121         route add -host $router dev $interface
 122       fi
 123       route add default gw $router
 124     done
 125   fi
 126   if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
 127    then
 128     ifconfig $interface:0- 0.0.0.0
 129     ifconfig $interface:0 $alias_ip_address $alias_subnet_arg
 130     route add -host $alias_ip_address $interface:0
 131   fi
 132   make_resolv_conf
 133   exit_with_hooks 0
 134 fi
 135
 136 if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
 137    || [ x$reason = xSTOP ]; then
 138   if [ x$alias_ip_address != x ]; then
 139     # Turn off alias interface.
 140     ifconfig $interface:0- 0.0.0.0
 141   fi
 142   if [ x$old_ip_address != x ]; then
 143     # Shut down interface, which will delete routes and clear arp cache.
 144     ifconfig $interface 0.0.0.0 down
 145   fi
 146   if [ x$alias_ip_address != x ]; then
 147     ifconfig $interface:0 $alias_ip_address $alias_subnet_arg
 148     route add -host $alias_ip_address $interface:0
 149   fi
 150
 151   # remove v4 dns configuration for this interface
 152   rm /etc/resolv.conf.dhclient
 153   cat /etc/resolv.conf.* > /etc/resolv.conf
 154
 155   exit_with_hooks 0
 156 fi
 157
 158 if [ x$reason = xTIMEOUT ]; then
 159   if [ x$alias_ip_address != x ]; then
 160     ifconfig $interface:0- 0.0.0.0
 161   fi
 162   ifconfig $interface $new_ip_address $new_subnet_arg \
 163                                         $new_broadcast_arg
 164   set $new_routers
 165   if ping -q -c 1 $1; then
 166     if [ x$new_ip_address != x$alias_ip_address ] && \
 167                         [ x$alias_ip_address != x ]; then
 168       ifconfig $interface:0 $alias_ip_address $alias_subnet_arg
 169       route add -host $alias_ip_address dev $interface:0
 170     fi
 171     for router in $new_routers; do
 172       if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
 173         route add -host $router dev $interface
 174       fi
 175       route add default gw $router
 176     done
 177     make_resolv_conf
 178     exit_with_hooks 0
 179   fi
 180   ifconfig $interface 0.0.0.0 down
 181   exit_with_hooks 1
 182 fi
 183
 184 ###
 185 ### DHCPv6 Handlers
 186 ###
 187
 188 if [ x$reason = xPREINIT6 ]; then
 189   # Ensure interface is up.
 190   ifconfig ${interface} up
 191
 192   # Remove any stale addresses from aborted clients.
 193   ip -f inet6 addr flush dev ${interface} scope global
 194
 195   exit_with_hooks 0
 196 fi
 197
 198 if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
 199     echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
 200
 201     exit_with_hooks 0
 202 fi
 203
 204 if [ x$reason = xBOUND6 ]; then
 205   if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
 206     exit_with_hooks 2;
 207   fi
 208
 209   ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen}
 210
 211   # Check for nameserver options.
 212   make_resolv_conf
 213
 214 ### <<
 215   # Set up softwire tunnel
 216   if [ x${new_dhcp6_softwire} != x ] ; then
 217     /etc/init.d/dhclient stop
 218     ifconfig ${interface} 0.0.0.0
 219     ip -6 tunnel add tun0 mode ipip6 \
 220         remote ${new_dhcp6_softwire} \
 221         local ${new_ip6_address} \
 222         dev ${interface} encaplimit none
 223     ip link set tun0 up
 224     ip route add default dev tun0
 225   fi
 226 ### >>
 227
 228   exit_with_hooks 0
 229 fi
 230
 231 if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ]; then
 232   if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
 233     exit_with_hooks 2;
 234   fi
 235
 236   ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen}
 237
 238   # Make sure nothing has moved around on us.
 239
 240   # Nameservers/domains/etc.
 241   if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
 242      [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
 243     make_resolv_conf
 244   fi
 245
 246   exit_with_hooks 0
 247 fi
 248
 249 if [ x$reason = xDEPREF6 ]; then
 250   if [ x${new_ip6_address} = x ] ; then
 251     exit_with_hooks 2;
 252   fi
 253
 254   # Busybox ifconfig has no way to communicate this to the kernel, so ignore it
 255
 256   exit_with_hooks 0
 257 fi
 258
 259 if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ]; then
 260   if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
 261     exit_with_hooks 2;
 262   fi
 263
 264   ifconfig ${interface} del ${old_ip6_address}/${old_ip6_prefixlen}
 265
 266   # remove v6 dns configuration for this interface
 267   rm /etc/resolv.conf.dhclient6
 268   cat /etc/resolv.conf.* > /etc/resolv.conf
 269
 270 ### <<
 271   # Tear down softwire tunnel
 272   if [ x${old_dhcp6_softwire} != x ] ; then
 273     ip link set tun0 down
 274     ip tunnel del tun0
 275   fi
 276 ### >>
 277
 278   exit_with_hooks 0
 279 fi
 280
 281 exit_with_hooks 0