usr.sbin/dhcp/clientscript/dhclient-script

   1 #!/bin/sh
   2 #
   3 # $NetBSD: dhclient-script,v 1.12 2006/10/08 17:09:32 riz Exp $
   4
   5 ENTERHOOKS=/etc/dhclient-enter-hooks
   6 EXITHOOKS=/etc/dhclient-exit-hooks
   7 RESOLV=/etc/resolv.conf
   8 SIGNATURE="# Created by dhclient from"
   9 INTSIG="$SIGNATURE $interface"
  10
  11 echo_resolv_conf() {
  12         echo "$INTSIG"
  13         echo search $new_domain_name
  14         for nameserver in $new_domain_name_servers; do
  15                 echo nameserver $nameserver
  16         done
  17 }
  18
  19 make_resolv_conf() {
  20         if [ ! -z "$new_domain_name_servers" ]; then
  21                 if [ -x /sbin/resolvconf ]; then
  22                         echo_resolv_conf | /sbin/resolvconf -a $interface
  23                 else
  24                         if [ -f $RESOLV ]; then
  25                                 while read line; do
  26                                         case $line in
  27                                         "$SIGNATURE"*)
  28                                                 ;;
  29                                         *)
  30                                                 mv $RESOLV $RESOLV.save;;
  31                                         esac
  32                                         break
  33                                 done < $RESOLV
  34                         fi
  35                         echo_resolv_conf > $RESOLV
  36                 fi
  37         fi
  38 }
  39
  40 restore_resolv_conf() {
  41         if [ -x /sbin/resolvconf ]; then
  42                 /sbin/resolvconf -d $interface
  43         elif [ -f $RESOLV.save -a -f $RESOLV ]; then
  44                 while read line; do
  45                         case $line in
  46                         "$INTSIG"*)
  47                                 mv $RESOLV.save $RESOLV;;
  48                         esac
  49                         break
  50                 done < $RESOLV
  51         fi
  52 }
  53
  54 # Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
  55 exit_with_hooks() {
  56         exit_status=$1
  57         if [ -f "$EXITHOOKS" ]; then
  58                 . "$EXITHOOKS"
  59         fi
  60         # probably should do something with exit status of the local script
  61         exit $exit_status
  62 }
  63
  64
  65 add_new_routes() {
  66         for router in $new_routers; do
  67                 route add default $router
  68         done >/dev/null 2>&1
  69
  70         set -- $new_static_routes
  71         while [ $# -gt 1 ]; do
  72                 route add $1 $2
  73                 shift; shift
  74         done
  75 }
  76
  77 delete_old_routes() {
  78         for router in $old_routers; do
  79                 route delete default $router
  80         done >/dev/null 2>&1
  81
  82         set -- $old_static_routes
  83         while [ $# -gt 1 ]; do
  84                 route delete $1 $2
  85                 shift; shift
  86         done
  87
  88         route -n flush -inet -llinfo -host
  89 }
  90
  91 # Invoke the local dhcp client enter hooks, if they exist.
  92 if [ -f $ENTERHOOKS ]; then
  93         exit_status=0
  94         . $ENTERHOOKS
  95         # allow the local script to abort processing of this state
  96         # local script must set exit_status variable to nonzero.
  97         if [ $exit_status -ne 0 ]; then
  98                 exit $exit_status
  99         fi
 100 fi
 101
 102 #if [ ! -z "$new_host_name" ]; then
 103 #       echo New Host Name: $new_host_name
 104 #fi
 105 #
 106 #if [ ! -z "$new_nis_domain" ]; then
 107 #       echo New NIS Domain: $new_nis_domain
 108 #fi
 109 #
 110 #if [ ! -z "$new_network_number" ]; then
 111 #       echo New Network Number: $new_network_number
 112 #fi
 113
 114 if [ ! -z "$new_broadcast_address" ]; then
 115 #       echo New Broadcast Address: $new_broadcast_address
 116         new_broadcast_arg="broadcast $new_broadcast_address"
 117 fi
 118
 119 if [ ! -z "$old_broadcast_address" ]; then
 120         old_broadcast_arg="broadcast $old_broadcast_address"
 121 fi
 122
 123 if [ ! -z "$new_subnet_mask" ]; then
 124         new_netmask_arg="netmask $new_subnet_mask"
 125 fi
 126
 127 if [ ! -z "$old_subnet_mask" ]; then
 128         old_netmask_arg="netmask $old_subnet_mask"
 129 fi
 130
 131 if [ ! -z "$alias_subnet_mask" ]; then
 132         alias_subnet_arg="netmask $alias_subnet_mask"
 133 fi
 134
 135 case "$reason" in
 136 MEDIUM)
 137         test -z "$medium" && exit_with_hooks 0
 138         eval "ifconfig $interface $medium"
 139         eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1
 140
 141         sleep 1
 142
 143         exit_with_hooks 0
 144         ;;
 145
 146 PREINIT)
 147         if [ ! -z "$alias_ip_address" ]; then
 148                 ifconfig $interface inet \
 149                     -alias $alias_ip_address >/dev/null 2>&1
 150                 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 151         fi
 152
 153         ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
 154             broadcast 255.255.255.255 up
 155
 156         exit_with_hooks 0
 157         ;;
 158
 159 ARPCHECK|ARPSEND)
 160         exit_with_hooks 0
 161         ;;
 162
 163 BOUND|RENEW|REBIND|REBOOT)
 164         if [ ! -z "$new_nis_domain" ]; then
 165                 if type domainname > /dev/null 2>&1; then
 166                         domainname $new_nis_domain
 167                 fi
 168         fi
 169
 170         if type hostname > /dev/null 2>&1; then
 171                 if [ \( -z "$current_hostname" \) -o \
 172                     \( "x$new_host_name" = "x$old_hostname" \) ]; then
 173                         current_hostname=`hostname`
 174                 fi
 175                 if [ \( -z "$current_hostname" \) -o \
 176                     \( "x$new_host_name" != "x$old_hostname" \) ]; then
 177                         hostname $new_host_name
 178                 fi
 179         fi
 180
 181         if [ \( ! -z "$old_ip_address" \) -a \( ! -z "$alias_ip_address" \) -a \
 182             \( "x$alias_ip_address" != "x$old_ip_address" \) ]; then
 183                 ifconfig $interface inet \
 184                     -alias $alias_ip_address > /dev/null 2>&1
 185                 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 186         fi
 187
 188         if [ \( ! -z "$old_ip_address" \) -a \
 189             \( "x$old_ip_address" != "x$new_ip_address" \) ]; then
 190                 eval "ifconfig $interface inet -alias $old_ip_address $medium"
 191                 route delete $old_ip_address 127.0.0.1 >/dev/null 2>&1
 192
 193                 delete_old_routes
 194         fi
 195
 196         if [ \( -z "$old_ip_address" \) -o \
 197             \( "x$old_ip_address" != "x$new_ip_address" \) -o \
 198             \( "x$reason" = "xBOUND" \) -o \( "x$reason" = "xREBOOT" \) ]; then
 199                 eval "ifconfig $interface inet $new_ip_address \
 200                     $new_netmask_arg $new_broadcast_arg $medium"
 201                 route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
 202
 203                 add_new_routes
 204         fi
 205
 206         if [ \( ! -z "$alias_ip_address" \) -a \
 207             \( "x$new_ip_address" != "x$alias_ip_address" \) ]; then
 208                 ifconfig $interface inet alias $alias_ip_address \
 209                     $alias_subnet_arg
 210                 route add $alias_ip_address 127.0.0.1
 211         fi
 212         make_resolv_conf
 213         exit_with_hooks 0
 214         ;;
 215
 216 EXPIRE|FAIL|RELEASE|STOP)
 217         if [ ! -z "$old_nis_domain" ]; then
 218                 if type domainname > /dev/null 2>&1; then
 219                         # delete the old nis domain name
 220                         domainname ""
 221                 fi
 222         fi
 223
 224         if [ ! -z "$alias_ip_address" ]; then
 225                 ifconfig $interface inet -alias $alias_ip_address
 226                 route delete $alias_ip_address 127.0.0.1
 227         fi > /dev/null 2>&1
 228
 229         if [ ! -z "$old_ip_address" ]; then
 230                 eval "ifconfig $interface inet -alias $old_ip_address $medium"
 231                 route delete $old_ip_address 127.0.0.1 >/dev/null 2>&1
 232                 delete_old_routes
 233
 234         fi
 235
 236         if [ ! -z "$alias_ip_address" ]; then
 237                 ifconfig $interface inet alias $alias_ip_address \
 238                     $alias_subnet_arg
 239                 route add $alias_ip_address 127.0.0.1
 240         fi
 241
 242         restore_resolv_conf
 243         exit_with_hooks 0
 244         ;;
 245
 246 TIMEOUT)
 247         if [ ! -z "$alias_ip_address" ]; then
 248                 ifconfig $interface inet -alias $alias_ip_address
 249                 route delete $alias_ip_address 127.0.0.1
 250         fi > /dev/null 2>&1
 251
 252         if [ ! -z "$new_host_name" ]; then
 253                 if type hostname > /dev/null 2>&1; then
 254                         hostname $new_host_name
 255                 fi
 256         fi
 257
 258         if [ ! -z "$new_nis_domain" ]; then
 259                 if type domainname > /dev/null 2>&1; then
 260                         domainname $new_nis_domain
 261                 fi
 262         fi
 263
 264         eval "ifconfig $interface inet $new_ip_address $new_netmask_arg \
 265             $new_broadcast_arg $medium"
 266         sleep 1
 267
 268         if [ ! -z "$new_routers" ]; then
 269                 set -- $new_routers
 270                 if ping -n -q -c 1 -w 1 $1; then
 271                         if [ \( ! -z "$alias_ip_address" \) -a \
 272                             \( "x$new_ip_address" != "x$alias_ip_address" \) ]
 273                         then
 274                                 ifconfig $interface inet alias \
 275                                     $alias_ip_address $alias_subnet_arg
 276                                 route add $alias_ip_address 127.0.0.1
 277                         fi
 278
 279                         route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
 280
 281                         add_new_routes
 282                         make_resolv_conf
 283                         exit_with_hooks 0
 284                 fi
 285         fi
 286
 287         eval "ifconfig $interface inet -alias $new_ip_address $medium"
 288
 289         delete_old_routes
 290
 291         exit_with_hooks 1
 292         ;;
 293 *)
 294         exit_with_hooks 0
 295         ;;
 296 esac