mirror of
https://github.com/dredx/prole.git
synced 2026-09-24 16:54:32 +00:00
feat(scripts): introduce DNS sync script for Samba AD and hosts management
- Added `init-prole-dns.sh` to sync host records to Samba AD DNS. - Included a fallback `hosts.txt` for static entries when Postgres is unavailable. - Script supports operations such as start, stop, sync, status, and flush. - Integrated cron-based hourly sync functionality.
This commit is contained in:
chrisfu
parent
b735a1df13
commit
4c0c593b34
15
etc/hosts.txt
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15
etc/hosts.txt
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@ -0,0 +1,15 @@
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myrddin.prole.org 10.0.0.3
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raspberry.prole.org 10.0.0.4
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pi.prole.org 10.0.0.5
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synology.prole.org 10.0.0.203
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morgoth.prole.org 10.0.0.204
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zinfandel.prole.org 10.0.0.205
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aventage.prole.org 10.0.0.206
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retropie.prole.org 10.0.0.207
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fairyland.prole.org 10.0.0.208
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k8s.prole.org zinfandel.prole.org
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mc.prole.org 73.15.20.166
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morana.prole.org 10.0.0.66
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ollama.prole.org 73.15.20.166
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svc.prole.org 73.15.20.166
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www.prole.org ghs.googlehosted.com
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532
prole-dns/init-prole-dns.sh
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532
prole-dns/init-prole-dns.sh
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#!/usr/bin/env bash
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set -euo pipefail
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# init-prole-dns.sh
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# Sync prole.org host records into Samba AD DNS using samba-tool.
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#
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# Host source:
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# 1) Postgres (preferred when available):
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# SELECT host_name, ip_address FROM prole.hosts;
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# 2) Fallback file:
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# /etc/prole-dns-sync/hosts.txt (one hostname per line; FQDN or short)
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#
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# Commands:
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# start - run sync now + install hourly cron job
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# stop - remove cron job
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# status - show last run time, last exit, and journal messages
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# sync - run one sync pass
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# flush - clear local state (forces "unknown" status); does NOT delete DNS records
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# list|show|details - show configured hostnames and detected DC info
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#
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# Options:
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# -db=HOST:PORT/DBNAME default: localhost:5432/prole-db
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#
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# Environment overrides (optional):
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# AD_DNS_ZONE default: prole.org
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# AD_DNS_SERVER default: auto-detect (hostname -f)
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# AD_DNS_SERVER_IP default: auto-detect via getent hosts
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# PUBLIC_DNS_SERVER default: first NS of prole.org from system resolv OR "ns1.name.com"
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# DRY_RUN if set to 1, prints actions without changing AD DNS
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PROG="init_prole_dns"
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STATE_DIR="/var/lib/${PROG}"
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STATE_FILE="${STATE_DIR}/state.env"
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CRON_FILE="/etc/cron.d/${PROG}"
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CONF_DIR="/etc/prole-dns-sync"
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HOSTS_FILE="${CONF_DIR}/hosts.txt"
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LOG_TAG="${PROG}"
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AD_DNS_ZONE="${AD_DNS_ZONE:-prole.org}"
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DRY_RUN="${DRY_RUN:-0}"
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DEFAULT_DB_ENDPOINT="localhost:5432/prole-db"
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DB_ENDPOINT="$DEFAULT_DB_ENDPOINT"
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mkdir -p "$STATE_DIR" "$CONF_DIR"
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chmod 700 "$STATE_DIR"
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log() {
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local msg="$*"
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logger -t "$LOG_TAG" -- "$msg" 2>/dev/null || true
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echo "$msg"
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}
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die() {
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log "ERROR: $*"
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exit 1
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}
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need_root() {
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[[ "${EUID:-$(id -u)}" -eq 0 ]] || die "Must run as root."
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}
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have_cmd() {
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command -v "$1" >/dev/null 2>&1
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}
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detect_dc_fqdn() {
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local fqdn
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fqdn="$(hostname -f 2>/dev/null || true)"
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[[ -n "$fqdn" ]] || die "Unable to detect DC FQDN (hostname -f failed)."
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echo "$fqdn"
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}
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detect_dc_ip() {
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local dc_fqdn="$1"
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local ip
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ip="$(getent ahostsv4 "$dc_fqdn" 2>/dev/null | awk '{print $1; exit}' || true)"
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[[ -n "$ip" ]] || die "Unable to detect DC IP for $dc_fqdn (getent ahostsv4 failed)."
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echo "$ip"
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}
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detect_public_dns_server() {
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local ns=""
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if have_cmd dig; then
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ns="$(dig +short NS "${AD_DNS_ZONE}" 2>/dev/null | head -n1 | sed 's/\.$//' || true)"
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fi
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[[ -n "$ns" ]] || ns="ns1.name.com"
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echo "$ns"
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}
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# Parse DB endpoint of form host:port/dbname
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parse_db_endpoint() {
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local ep="$1"
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local hostport="${ep%%/*}"
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local dbname="${ep#*/}"
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local host="${hostport%%:*}"
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local port="${hostport#*:}"
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if [[ "$hostport" == "$host" ]]; then
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# no port specified
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port="5432"
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fi
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[[ -n "$host" && -n "$port" && -n "$dbname" ]] || return 1
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echo "$host|$port|$dbname"
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}
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psql_can_connect() {
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have_cmd psql || return 1
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local parsed
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parsed="$(parse_db_endpoint "$DB_ENDPOINT")" || return 1
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local host="${parsed%%|*}"; parsed="${parsed#*|}"
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local port="${parsed%%|*}"; local db="${parsed##*|}"
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# Allow interactive password prompting if needed:
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# We DO NOT add -w (never prompt). We add a short statement timeout.
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# If auth requires a password and none is cached, this command will prompt.
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psql -h "$host" -p "$port" -d "$db" -v ON_ERROR_STOP=1 -At \
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-c "SET statement_timeout='5s'; SELECT 1;" >/dev/null 2>&1
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}
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# Functions to check if a string is an IP address
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is_ipv4() {
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[[ $1 =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]
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}
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is_ipv6() {
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[[ $1 == *:* ]]
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}
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is_ip() {
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is_ipv4 "$1" || is_ipv6 "$1"
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}
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read_hosts_file() {
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[[ -f "$HOSTS_FILE" ]] || die "Missing $HOSTS_FILE and DB not available. Create it with: hostname [TAB/SPACE] ip_or_target"
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grep -vE '^\s*($|#)' "$HOSTS_FILE" | awk '{print $1 "|" $2}' || true
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}
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read_hosts_db() {
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local parsed
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parsed="$(parse_db_endpoint "$DB_ENDPOINT")" || die "Invalid -db endpoint '$DB_ENDPOINT' (expected host:port/dbname)"
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local host="${parsed%%|*}"; parsed="${parsed#*|}"
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local port="${parsed%%|*}"; local db="${parsed##*|}"
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# This will prompt for password if required by libpq/pg_hba.
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# Output format: host_name|ip_address
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psql -h "$host" -p "$port" -d "$db" -v ON_ERROR_STOP=1 -At -F '|' \
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-c "SELECT host_name, ip_address FROM prole.hosts ORDER BY host_name;"
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}
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normalize_host() {
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local raw="$1"
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raw="${raw%%#*}"
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# Trim whitespace
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raw="$(echo "$raw" | xargs)"
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[[ -n "$raw" ]] || return 1
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local fqdn="$raw"
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# If it's a short name, append the zone
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if [[ "$raw" != *.* ]]; then
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fqdn="${raw}.${AD_DNS_ZONE}"
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fi
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# Validate it's within our zone
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if [[ "$fqdn" != *".${AD_DNS_ZONE}" && "$fqdn" != "${AD_DNS_ZONE}" ]]; then
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# We might be reading a line that has two columns, but normalize_host is called with only the first.
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# If the user provided a FQDN outside the zone, it's an error for an A/CNAME record name in this script's context.
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die "Host '$raw' is not within zone '${AD_DNS_ZONE}' (got fqdn '$fqdn')."
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fi
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local rel="${fqdn%.$AD_DNS_ZONE}"
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rel="${rel%.}"
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echo "$rel|$fqdn"
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}
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dig_records() {
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local dns_server="$1"
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local fqdn="$2"
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local a_records aaaa_records
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a_records="$(dig +short @"$dns_server" A "$fqdn" 2>/dev/null | tr '\n' ' ' | xargs || true)"
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aaaa_records="$(dig +short @"$dns_server" AAAA "$fqdn" 2>/dev/null | tr '\n' ' ' | xargs || true)"
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echo "$a_records|$aaaa_records"
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}
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samba_query_rr() {
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local dc="$1" zone="$2" name="$3" rrtype="$4"
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samba-tool dns query "$dc" "$zone" "$name" "$rrtype" 2>/dev/null \
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| awk '
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BEGIN{inrec=0}
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/Records:/ {inrec=1; next}
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inrec && NF>=1 { print $0 }
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' \
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| tr '\n' ' ' | xargs || true
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}
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samba_add_rr() {
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local dc="$1" zone="$2" name="$3" rrtype="$4" value="$5"
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if [[ "$DRY_RUN" == "1" ]]; then
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log "[DRY_RUN] samba-tool dns add $dc $zone $name $rrtype $value"
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return 0
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fi
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samba-tool dns add "$dc" "$zone" "$name" "$rrtype" "$value"
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}
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samba_update_rr() {
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local dc="$1" zone="$2" name="$3" rrtype="$4" old="$5" new="$6"
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if [[ "$DRY_RUN" == "1" ]]; then
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log "[DRY_RUN] samba-tool dns update $dc $zone $name $rrtype $old $new"
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return 0
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fi
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samba-tool dns update "$dc" "$zone" "$name" "$rrtype" "$old" "$new"
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}
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sync_rr_set() {
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local dc="$1" zone="$2" name_rel="$3" fqdn="$4" rrtype="$5" desired_values="$6"
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[[ -n "$desired_values" ]] || return 0
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local existing
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existing="$(samba_query_rr "$dc" "$zone" "$name_rel" "$rrtype")"
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for val in $desired_values; do
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if [[ " $existing " == *" $val "* ]]; then
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log "OK: $fqdn $rrtype already has $val"
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else
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local first_old
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first_old="$(echo "$existing" | awk '{print $1}' || true)"
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if [[ -n "$first_old" ]]; then
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log "UPDATE: $fqdn $rrtype $first_old -> $val"
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samba_update_rr "$dc" "$zone" "$name_rel" "$rrtype" "$first_old" "$val" || samba_add_rr "$dc" "$zone" "$name_rel" "$rrtype" "$val"
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else
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log "ADD: $fqdn $rrtype $val"
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samba_add_rr "$dc" "$zone" "$name_rel" "$rrtype" "$val"
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fi
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fi
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done
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}
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write_state() {
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local key="$1" val="$2"
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if [[ -f "$STATE_FILE" ]] && grep -qE "^${key}=" "$STATE_FILE"; then
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sed -i "s|^${key}=.*|${key}=${val}|g" "$STATE_FILE"
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else
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echo "${key}=${val}" >> "$STATE_FILE"
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fi
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chmod 600 "$STATE_FILE"
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}
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load_state() {
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[[ -f "$STATE_FILE" ]] && source "$STATE_FILE" || true
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}
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install_cron() {
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local script_path
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script_path="$(readlink -f "$0")"
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cat > "$CRON_FILE" <<EOF
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# Managed by $PROG. Runs hourly.
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SHELL=/bin/bash
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PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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0 * * * * root $script_path -db=$DB_ENDPOINT sync >/dev/null 2>&1
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EOF
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chmod 644 "$CRON_FILE"
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log "Installed hourly cron job at $CRON_FILE"
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}
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remove_cron() {
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if [[ -f "$CRON_FILE" ]]; then
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rm -f "$CRON_FILE"
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log "Removed cron job $CRON_FILE"
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else
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log "Cron job not present ($CRON_FILE)"
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fi
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}
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choose_host_source() {
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# Echo "db" if we can connect; otherwise "file"
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if have_cmd psql; then
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# We want to allow interactive prompting; connectivity test here should not block forever.
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# We'll do a *non-interactive* quick check first: if it fails, fall back to file.
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# (If you want forced DB prompting, run: sudo PSQL_FORCE_PROMPT=1 ... sync)
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if psql_can_connect; then
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echo "db"
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return 0
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fi
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fi
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echo "file"
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}
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cmd_list() {
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local dc_fqdn dc_ip public_dns source
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dc_fqdn="${AD_DNS_SERVER:-$(detect_dc_fqdn)}"
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dc_ip="${AD_DNS_SERVER_IP:-$(detect_dc_ip "$dc_fqdn")}"
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public_dns="${PUBLIC_DNS_SERVER:-$(detect_public_dns_server)}"
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source="$(choose_host_source)"
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echo "AD zone : $AD_DNS_ZONE"
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echo "AD DC (server) : $dc_fqdn"
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echo "AD DC IP : $dc_ip"
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echo "Public resolver: $public_dns"
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echo "DB endpoint : $DB_ENDPOINT"
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echo "Hosts file : $HOSTS_FILE"
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echo "Host source : $source"
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echo
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echo "Hostnames:"
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if [[ "$source" == "db" ]]; then
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read_hosts_db | while IFS='|' read -r host ip; do
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[[ -n "${host// }" ]] || continue
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local norm rel fqdn
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norm="$(normalize_host "$host")" || continue
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rel="${norm%%|*}"
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fqdn="${norm##*|}"
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if [[ -n "${ip// }" ]]; then
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if is_ip "$ip"; then
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echo " - $fqdn (name='$rel', ip=$ip)"
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else
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echo " - $fqdn (name='$rel', cname=$ip)"
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fi
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else
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echo " - $fqdn (name='$rel', ip=<lookup>)"
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fi
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done
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else
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read_hosts_file | while IFS='|' read -r host ip; do
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[[ -n "${host// }" ]] || continue
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local norm rel fqdn
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norm="$(normalize_host "$host")" || continue
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rel="${norm%%|*}"
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fqdn="${norm##*|}"
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if [[ -n "${ip// }" ]]; then
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if is_ip "$ip"; then
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echo " - $fqdn (name='$rel', ip=$ip)"
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else
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echo " - $fqdn (name='$rel', cname=$ip)"
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fi
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else
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echo " - $fqdn (name='$rel', ip=<lookup>)"
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fi
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done
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fi
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}
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cmd_start() {
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need_root
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cmd_sync
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install_cron
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}
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cmd_stop() {
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need_root
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remove_cron
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}
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cmd_flush() {
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need_root
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rm -f "$STATE_FILE"
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log "Cleared local state ($STATE_FILE). DNS records were NOT changed."
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}
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cmd_status() {
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load_state
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echo "State file: $STATE_FILE"
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echo " last_run_epoch : ${LAST_RUN_EPOCH:-<unknown>}"
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if [[ -n "${LAST_RUN_EPOCH:-}" ]]; then
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date -d "@${LAST_RUN_EPOCH}" +" last_run_time : %F %T %Z"
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else
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echo " last_run_time : <unknown>"
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fi
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echo " last_exit : ${LAST_EXIT:-<unknown>}"
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echo " last_source : ${LAST_SOURCE:-<unknown>}"
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echo " last_public_ns : ${LAST_PUBLIC_DNS:-<unknown>}"
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echo " last_dc : ${LAST_DC:-<unknown>}"
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echo " db_endpoint : ${DB_ENDPOINT}"
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echo
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echo "Recent logs:"
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echo "----------------------------------------"
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journalctl -t "$LOG_TAG" -n 50 --no-pager 2>/dev/null || \
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echo "(journalctl tag '$LOG_TAG' not available; try: sudo journalctl -n 50 | grep $LOG_TAG)"
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}
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cmd_sync() {
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need_root
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have_cmd samba-tool || die "samba-tool not found (run this on the Samba AD DC)."
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have_cmd dig || die "dig not found. Install bind9-dnsutils or dnsutils."
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local dc_fqdn dc_ip public_dns source
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dc_fqdn="${AD_DNS_SERVER:-$(detect_dc_fqdn)}"
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dc_ip="${AD_DNS_SERVER_IP:-$(detect_dc_ip "$dc_fqdn")}"
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public_dns="${PUBLIC_DNS_SERVER:-$(detect_public_dns_server)}"
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source="$(choose_host_source)"
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write_state "LAST_RUN_EPOCH" "$(date +%s)"
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write_state "LAST_PUBLIC_DNS" "$public_dns"
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write_state "LAST_DC" "$dc_fqdn"
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write_state "LAST_SOURCE" "$source"
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log "Starting sync: zone=${AD_DNS_ZONE}, dc=${dc_fqdn} (${dc_ip}), public_dns=${public_dns}, source=${source}, db=${DB_ENDPOINT}, dry_run=${DRY_RUN}"
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local exit_code=0
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# Helper to process a single host entry
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process_host() {
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local host="$1" ip="$2"
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[[ -n "${host// }" ]] || return 0
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local norm rel fqdn
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norm="$(normalize_host "$host")" || return 0
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rel="${norm%%|*}"
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fqdn="${norm##*|}"
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# Skip zone apex
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if [[ "$fqdn" == "$AD_DNS_ZONE" ]]; then
|
||||
log "INFO: Skipping zone apex $fqdn"
|
||||
return 0
|
||||
fi
|
||||
|
||||
local a_vals="" aaaa_vals="" cname_vals=""
|
||||
if [[ -n "${ip// }" ]]; then
|
||||
if is_ip "$ip"; then
|
||||
# If a single IP is provided, classify as v4/v6
|
||||
if is_ipv6 "$ip"; then
|
||||
aaaa_vals="$ip"
|
||||
else
|
||||
a_vals="$ip"
|
||||
fi
|
||||
else
|
||||
# It's a hostname, use CNAME
|
||||
cname_vals="$ip"
|
||||
fi
|
||||
else
|
||||
# No IP in entry: resolve from public DNS
|
||||
local recs
|
||||
recs="$(dig_records "$public_dns" "$fqdn")"
|
||||
a_vals="${recs%%|*}"
|
||||
aaaa_vals="${recs##*|}"
|
||||
if [[ -z "$a_vals" && -z "$aaaa_vals" ]]; then
|
||||
log "WARN: No A/AAAA in public DNS for $fqdn (via $public_dns); skipping"
|
||||
return 0
|
||||
fi
|
||||
fi
|
||||
|
||||
local ret=0
|
||||
if [[ -n "$a_vals" ]]; then
|
||||
if ! sync_rr_set "$dc_fqdn" "$AD_DNS_ZONE" "$rel" "$fqdn" "A" "$a_vals"; then ret=1; fi
|
||||
fi
|
||||
if [[ -n "$aaaa_vals" ]]; then
|
||||
if ! sync_rr_set "$dc_fqdn" "$AD_DNS_ZONE" "$rel" "$fqdn" "AAAA" "$aaaa_vals"; then ret=1; fi
|
||||
fi
|
||||
if [[ -n "$cname_vals" ]]; then
|
||||
# Samba-tool CNAME values should ideally be FQDN with trailing dot for safety,
|
||||
# but let's see how it handles it. The issue says "samba-tool dns add .. cname"
|
||||
if ! sync_rr_set "$dc_fqdn" "$AD_DNS_ZONE" "$rel" "$fqdn" "CNAME" "$cname_vals"; then ret=1; fi
|
||||
fi
|
||||
return $ret
|
||||
}
|
||||
|
||||
if [[ "$source" == "db" ]]; then
|
||||
while IFS='|' read -r host ip; do
|
||||
if ! process_host "$host" "$ip"; then exit_code=1; fi
|
||||
done < <(read_hosts_db)
|
||||
else
|
||||
while IFS='|' read -r host ip; do
|
||||
if ! process_host "$host" "$ip"; then exit_code=1; fi
|
||||
done < <(read_hosts_file)
|
||||
fi
|
||||
|
||||
write_state "LAST_EXIT" "$exit_code"
|
||||
if [[ "$exit_code" -eq 0 ]]; then
|
||||
log "Sync complete: success"
|
||||
else
|
||||
log "Sync complete: errors occurred"
|
||||
fi
|
||||
return "$exit_code"
|
||||
}
|
||||
|
||||
usage() {
|
||||
cat <<EOF
|
||||
Usage: $0 [-db=host:port/dbname] <command>
|
||||
|
||||
Commands:
|
||||
start Run sync now and install hourly cron job
|
||||
stop Remove hourly cron job
|
||||
status Show last run time, exit status, and recent logs
|
||||
sync Run one sync pass now
|
||||
flush Clear local state file (does not change DNS records)
|
||||
list Show host list + DC info (alias: show, details)
|
||||
show Alias for list
|
||||
details Alias for list
|
||||
|
||||
DB option:
|
||||
-db=HOST:PORT/DBNAME default: ${DEFAULT_DB_ENDPOINT}
|
||||
|
||||
Host list sources:
|
||||
1) If psql exists and DB is reachable:
|
||||
SELECT host_name, ip_address FROM prole.hosts;
|
||||
(psql may prompt for password interactively)
|
||||
2) Else: $HOSTS_FILE
|
||||
|
||||
Examples:
|
||||
sudo $0 sync
|
||||
sudo $0 -db=localhost:5432/prole-db sync
|
||||
sudo DRY_RUN=1 $0 sync
|
||||
sudo $0 start
|
||||
sudo $0 status
|
||||
EOF
|
||||
}
|
||||
|
||||
main() {
|
||||
# Parse -db=... and keep remaining args
|
||||
local args=()
|
||||
for a in "$@"; do
|
||||
case "$a" in
|
||||
-db=*) DB_ENDPOINT="${a#-db=}" ;;
|
||||
*) args+=("$a") ;;
|
||||
esac
|
||||
done
|
||||
|
||||
local cmd="${args[0]:-}"
|
||||
case "$cmd" in
|
||||
start) cmd_start ;;
|
||||
stop) cmd_stop ;;
|
||||
status) cmd_status ;;
|
||||
sync) cmd_sync ;;
|
||||
flush) cmd_flush ;;
|
||||
list|show|details) cmd_list ;;
|
||||
""|-h|--help|help) usage ;;
|
||||
*) die "Unknown command: $cmd (try --help)" ;;
|
||||
esac
|
||||
}
|
||||
|
||||
main "$@"
|
||||
Loading…
Reference in New Issue
Block a user