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dhcp 4.1 r7

    1: #!/bin/sh
    2: 
    3: # This script can be installed in /etc/dhclient-enter-hooks to set the client's
    4: # hostname based either on the hostname that the DHCP server supplied or the
    5: # hostname in whatever ptr record exists for the assigned IP address.
    6: 
    7: if [ x$new_host_name = x ]; then
    8:   ptrname=`echo $new_ip_address \
    9: 	   |sed -e \
   10:   's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\4.\3.\2.\1.in-addr.arpa/'`
   11:   (echo "set type=ptr"; echo "$ptrname") |nslookup >/tmp/nslookup.$$
   12:   set `sed -n -e "s/$ptrname[ 	]*\(canonical \)*name *= *\(.*\)/\2 \1/p" \
   13: 							< /tmp/nslookup.$$` _
   14:   if [ x$1 = x_ ]; then
   15:     new_host_name=""
   16:   else
   17:     if [ $# -gt 1 ] && [ x$2 = xcanonical ]; then
   18:       new_host_name=`sed -n -e "s/$1[ 	]*name *= *\(.*\)/\1/p" \
   19: 							</tmp/nslookup.$$`
   20:     else
   21:       new_host_name=$1
   22:     fi
   23:   fi
   24:   rm /tmp/nslookup.$$
   25: fi
   26: if [ x$new_host_name != x ]; then
   27:   hostname $new_host_name
   28: fi
   29: