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#!/bin/bash

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# vim: set ft=sh :

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set -ue

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ROOT=$(pwd)

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BIN=$ROOT/bin

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PROCESS_ZONE=$BIN/process-zone

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EXPAND_ZONE=$BIN/expand-zone

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SETTINGS=$ROOT/settings

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ZONES=$ROOT/zones

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SERIALS=$ROOT/serials

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PROCESS_ARGS='--input-charset latin-1'

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FORWARD_MX=mail

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REVERSE_ZONE=194.197.235

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REVERSE_DOMAIN=paivola.fi

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function log {

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    echo "$*" >&2

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}

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function die {

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    log "$*"

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    exit 1

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}

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function log_cmd {

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    local msg=$1; shift

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    #log ">>>" "$@"

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    echo -n "$msg... " >&2

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    "$@" && log "OK" >&2 || die "Failed"

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}

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[ -d $SETTINGS ] || die "Missing settings: $SETTINGS"

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[ -d $SERIALS ] || die "Missing serials: $SERIALS"

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[ -d $ZONES ] || die "Missing zones: $ZONES"

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function expand_zone {

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    local output=$1; shift

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    $EXPAND_ZONE -o $output "$@"

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}

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function process_zone {

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    local output=$1; shift

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    $PROCESS_ZONE $PROCESS_ARGS -o $output "$@"

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}

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function copy_zone_part {

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    local zone=$1

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    local part=$2

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    local name=$zone.zone.$part

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    log_cmd "Copying zone $zone/$part: zones/$name"

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    cp $SETTINGS/$name $ZONES/$name

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}

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function update_zone {

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    local zone=$1

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    local name=$zone.zone

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    log_cmd "Generating $zone zone headers: zones/$name" \

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        expand_zone     $ZONES/$name    $SETTINGS/$zone.zone   \

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            --serial $SERIALS/$zone.serial --update-serial  \

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            --expand zones=$ZONES

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}

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function update_zone_view {

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    local zone=$1

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    local view=$2

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    local name=$view/$zone.zone

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    log_cmd "Generating $zone:$view zone headers: zones/$name" \

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        expand_zone     $ZONES/$name    $SETTINGS/$zone.zone   \

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            --serial $SERIALS/$zone.serial --update-serial  \

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            --expand zones=$ZONES   \

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            --expand view=$view

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}

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function main {

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    log_cmd "Generating external forward zone: zones/external/paivola.zone.hosts" \

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        process_zone    $ZONES/external/paivola.zone.hosts  $SETTINGS/paivola.txt --forward-zone

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    log_cmd "Generating internal forward zone: zones/internal/paivola.zone.hosts" \

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        process_zone    $ZONES/internal/paivola.zone.hosts  $SETTINGS/paivola.txt --forward-zone --forward-txt --forward-mx $FORWARD_MX

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    log_cmd "Generating reverse zones: zones/paivola-reverse.zone.hosts" \

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        process_zone    $ZONES/paivola-reverse.zone.hosts   $SETTINGS/paivola.txt --reverse-zone $REVERSE_ZONE --reverse-domain $REVERSE_DOMAIN

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    copy_zone_part      paivola             auto

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    copy_zone_part      paivola             services

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    copy_zone_part      paivola             internal

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    copy_zone_part      paivola             external

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    update_zone         paivola-reverse

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    update_zone_view    paivola             internal

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    update_zone_view    paivola             external

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}

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main