genstatic

早期freebsd实现

#!/bin/sh
# @(#) genstatic 1.4 92/08/31 @(#)
# generate the static hosttable from database files
# called from updatehosts
#
# files used
#	hosts.local
#	hosts.main
#	hosts.cname

# Copyright (c) 1992 by Texas Internet Consulting
# This code may be freely copied and used so long as this
# copyright notice is attached.  This code may not be sold
# without the express written permission of Texas Internet Consulting.
# Texas Internet Consulting makes no warranty as to the correctness
# nor the applicability of this code for any purpose.

# this cannot be /etc/hosts
HOSTS=hosts.static
SERIAL=serial
PATH=.:$PATH

# put the serial number of this table as the first line
serial=`cat $SERIAL`
echo "# $serial" >$HOSTS

# extract host name and IP address from hosts.main
readinfo ip host <hosts.main  | awk '
{
	# split up the domain name
	n = split($2, domain, ".")
	printf("%s %s %s\n", $1, $2, domain[1])
}' >>$HOSTS

# build edit script for aliases
readinfo host alias <hosts.cname | awk '
{
	# extract simple alias name from domain name
	n = split($2, alias, ".")
	# split up the domain name
	n = split($1, domain, ".")
	# build the edit command for this line
	# will look like /<domain>/s/$/<alias> <alias.domain>/
	edcmd = "/" domain[1]
	# replace "." with "\."
	for (i=2; i<=n; i++) {
		edcmd = edcmd "\\." domain[i]
	}
	edcmd = edcmd "/s/$/ " $2 " " alias[1] "/"
	print edcmd
}
END {
	print "w"
	print "q"
}' | ed >/dev/null 2>&1 $HOSTS