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Annotation of embedaddon/dhcp/contrib/sethostname.sh, revision 1.1

1.1     ! misho       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: