#! /bin/sh -e

# generate a new dcc_conf file from an existing file

# Copyright (c) 2008 by Rhyolite Software, LLC
#
# This agreement is not applicable to any entity which sells anti-spam
# solutions to others or provides an anti-spam solution as part of a
# security solution sold to other entities, or to a private network
# which employs the DCC or uses data provided by operation of the DCC
# but does not provide corresponding data to other users.
#
# Permission to use, copy, modify, and distribute this software without
# changes for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear in all
# copies and any distributed versions or copies are either unchanged
# or not called anything similar to "DCC" or "Distributed Checksum
# Clearinghouse".
#
# Parties not eligible to receive a license under this agreement can
# obtain a commercial license to use DCC by contacting Rhyolite Software
# at sales@rhyolite.com.
#
# A commercial license would be for Distributed Checksum and Reputation
# Clearinghouse software.  That software includes additional features.  This
# free license for Distributed ChecksumClearinghouse Software does not in any
# way grant permision to use Distributed Checksum and Reputation Clearinghouse
# software
#
# THE SOFTWARE IS PROVIDED "AS IS" AND RHYOLITE SOFTWARE, LLC DISCLAIMS ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL RHYOLITE SOFTWARE, LLC
# BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
# SOFTWARE.

#	Rhyolite Software DCC 1.3.103-1.23 $Revision$

FNAME=dcc_conf

CUR=
PROTOTYPE=$FNAME
SUFFIX=new
NEW=
DCC_HOMEDIR=

USAGE="$0: [-x] [-i cur] [-s new-suffix] [-p prototype] [-o new] -h homedir"
while getopts "xi:s:p:o:h:" c; do
    case $c in
	x) set -x;;
	i) CUR="$OPTARG";;
	s) if test -n "$OPTARG"; then
	    SUFFIX="$OPTARG"
	    fi
	    ;;
	p) PROTOTYPE="$OPTARG";;
	o) NEW="$OPTARG";;
	h) DCC_HOMEDIR="$OPTARG";;
	*) echo "$USAGE" 1>&2; exit 1;;
    esac
done
shift `expr $OPTIND - 1 || true`
if test "$#" -ne 0 -o ! -d "$DCC_HOMEDIR"; then
    echo "$USAGE" 1>&2
    exit 1
fi

if test ! -s "$PROTOTYPE"; then
    echo "prototype $PROTOTYPE does not exist" 1>&2
    exit 1
fi

if test -z "$CUR"; then
    CUR="$DCC_HOMEDIR/$FNAME"
fi
if test ! -f "$CUR"; then
    echo "$CUR does not exist" 1>&2
    exit 1
fi

if test -z "$NEW"; then
    NEW="$CUR-$SUFFIX"
fi

# Use /^[ABCDEFGHIJKLMNOPQRSTUVWXYZ]/ patterns instead of easier to read,
# probably faster /^[A-Z/ patterns because someone has decided that
# GNU Awk 3.1.3 (at least on x86_64) should have /^[A-Z]/ match "fi"
# with IGNORECASE=0 and even in traditional mode.

rm -f $NEW
awk '(first_file == "") {
	    first_file = FILENAME;
	}
	/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ]/ {
	    # deal with continuation lines
	    line = $0;
	    while (substr(line,length(line)) == "\\") {
		if (getline <= 0) {
		    break;
		}
		line = line "\n" $0;
	    }
	    # divide the line into the variable name or key and its value
	    inx = index(line, "=");
	    if (inx == 0) {
		inx = length(line)+1;
	    }
	    key = substr(line, 1, inx-1);
	    val = substr(line, inx+1);
	    # only record things in the first file
	    if (first_file == FILENAME) {
		defined[key] = 1;
		mem[key] = val;
		if (cur_comment) {
		    comments[key] = cur_comment;
		    cur_comment = "";
		}
	    } else {
		# on first line of second file, make compatibility adjustments
		if (!adjusted) {
		    adjusted = 1;
		    if (mem["DCCD_ENABLE"] == "") {
			defined["DCCD_ENABLE"] = 1;
			if (mem["SRVR_ID"] == "") {
			    mem["DCCD_ENABLE"] = "off";
			} else {
			    mem["DCCD_ENABLE"] = "on";
			}
		    }
		    # fix DCC_RUNDIR=@dcc_rundir@ bug in 1.2.14 and preceding
		    if (defined["DCC_RUNDIR"]) {
			if (mem["DCC_RUNDIR"] == "@dcc_rundir@") {
			    defined["DCC_RUNDIR"] = 0;
			}
		    }
		    # Use new values of some variables if their old values were
		    #	defaults.  This makes ./configure changes effective.
		    if (mem["Configure_DCC_LIBEXEC"] == mem["DCC_LIBEXEC"]) {
			defined["DCC_LIBEXEC"] = 0;
		    }
		    if (mem["Configure_DCC_RUNDIR"] == mem["DCC_RUNDIR"]) {
			defined["DCC_RUNDIR"] = 0;
		    }
		    if (mem["Configure_DCCSUID"] == mem["DCCSUID"]) {
			defined["DCCSUID"] = 0;
		    }
		    if (mem["Configure_DCC_LOGGER"] == mem["DCC_LOGGER"]) {
			defined["DCC_LOGGER"] = 0;
		    }
		    # use new, configured values of some variables
		    if (defined["DCC_CONF_VERSION"])
			old_version = mem["DCC_CONF_VERSION"];
		    defined["DCC_CONF_VERSION"] = 0;
		    defined["Configure_DCC_LIBEXEC"] = 0;
		    defined["Configure_DCC_RUNDIR"] = 0;
		    defined["Configure_DCCSUID"] = 0;
		    defined["Configure_DCC_LOGGER"] = 0;
		}
		if (defined[key]) {
		    if (comments[key] && old_version > 3) {
			print comments[key];
		    }
		    print key "=" mem[key];
		} else {
		    print line;
		}
	    }
	}
	!/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ]/ {
	    if (FILENAME != first_file) {
		print $0;
	    } else {
		if ($0 ~ /^ *#/ && $1 != "#") {
		    if (cur_comment) {
			cur_comment = cur_comment "\n" $0;
		    } else {
			cur_comment = $0;
		    }
		}
	    }
	}' $CUR $PROTOTYPE >$NEW