Ryan Malloy
87eaa27c4c
Previously: `SERIAL=$(date +%Y%m%d)01` — same-day re-runs produced the same serial. HE polled, saw no change, never pulled the update. Now: scan zones-prepared/ for the highest `YYYYMMDDNN` matching today's date and increment the NN counter. First run of the day starts at NN=01. Caps at NN=99 with a clear error message (set SERIAL manually if you genuinely need >99 changes per day). `SERIAL=<value> make prep` still overrides the auto-detection, useful for forcing a specific serial during recovery or for testing. Verified end-to-end on dell01: prep bumped 2026051601 → 2026051602, CoreDNS auto-reload picked it up within 30s, all queried zones serve the new serial. HE will pull on its next refresh poll (SOA refresh = 3600s, so worst case 1 hour).
124 lines
4.3 KiB
Bash
Executable File
124 lines
4.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Injects an SOA record + canonical NS records into each raw Vultr zone
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# file, then writes the result to zones-prepared/. Source files in zones/
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# are never modified.
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#
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# Corrections applied to each zone:
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# 1. Synthesize SOA — Vultr's export omits it. SOA mname is ns1.he.net
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# because Hurricane Electric secondaries serve the public face of
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# these zones (hidden-primary architecture).
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# 2. Strip the source's ns1.vultr.com / ns2.vultr.com NS records and
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# replace with the five HE nameservers, so AXFR-pulled zones at HE
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# advertise the correct delegation.
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# 3. Apex disambiguation: lines starting with leading-TAB-then-TTL get
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# "@" prepended (Vultr's apex convention vs. RFC 1035 inheritance).
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# 4. Dot-terminate NS/MX/CNAME rdata (Vultr exports unqualified names).
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set -euo pipefail
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SRC_DIR="${SRC_DIR:-zones}"
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DST_DIR="${DST_DIR:-zones-prepared}"
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ADMIN_EMAIL="${ADMIN_EMAIL:-admin}" # becomes admin.<zone>.
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# Serial number generation — YYYYMMDDNN format (RFC 1912 §2.2).
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#
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# Strategy: every `make prep` run produces a strictly-increasing serial
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# so that HE slaves notice the change on their next poll. If today's
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# previous serials exist in zones-prepared/, increment the 2-digit
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# counter. Otherwise start at NN=01.
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#
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# Honors an explicit override: `SERIAL=2026051699 make prep` skips the
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# auto-detection.
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TODAY=$(date +%Y%m%d)
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if [[ -z "${SERIAL:-}" ]]; then
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# Pull the highest YYYYMMDDNN serial from currently-prepared zones
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# that starts with today's date. If none, default to NN=01.
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highest=$(grep -hE '^[[:space:]]+'"${TODAY}"'[0-9]{2}[[:space:]]+;' "$DST_DIR"/*.zone 2>/dev/null \
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| awk '{print $1}' | sort -un | tail -1)
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if [[ -n "$highest" ]]; then
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nn=$((10#${highest:8:2}))
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next_nn=$((nn + 1))
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if (( next_nn > 99 )); then
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echo "ERROR: serial counter exhausted for ${TODAY} (NN=99 reached)." >&2
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echo "Set SERIAL manually or wait until tomorrow." >&2
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exit 1
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fi
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SERIAL=$(printf "%s%02d" "$TODAY" "$next_nn")
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else
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SERIAL="${TODAY}01"
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fi
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fi
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# Public-facing nameservers (Hurricane Electric free secondary service).
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# These appear in NS records inside every zone so that recursive
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# resolvers fetching the zone learn the correct delegation.
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HE_NAMESERVERS=(
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"ns1.he.net."
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"ns2.he.net."
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"ns3.he.net."
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"ns4.he.net."
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"ns5.he.net."
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)
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mkdir -p "$DST_DIR"
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count=0
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for src in "$SRC_DIR"/*.zone; do
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fname=$(basename "$src")
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zone="${fname%.zone}"
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dst="$DST_DIR/$fname"
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{
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echo "; Auto-prepared by scripts/prepare-zones.sh on $(date -Iseconds)"
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echo "; Source: $src"
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echo "\$ORIGIN ${zone}."
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echo "\$TTL 3600"
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echo "@ 3600 IN SOA ns1.he.net. ${ADMIN_EMAIL}.${zone}. ("
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echo " ${SERIAL} ; serial — bump per change (SERIAL=YYYYMMDDNN make prep)"
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echo " 3600 ; refresh (1 hour)"
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echo " 1800 ; retry (30 minutes)"
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echo " 604800 ; expire (1 week)"
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echo " 300 ; minimum (5 minutes)"
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echo " )"
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echo ""
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# Inject HE nameservers as the authoritative NS set.
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for ns in "${HE_NAMESERVERS[@]}"; do
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echo "@ 3600 IN NS ${ns}"
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done
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echo ""
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# Strip source's own $ORIGIN / $TTL / comments AND drop ns?.vultr.com
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# NS records (we just emitted HE's NS set above). Then run the awk
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# transformations for apex disambiguation and rdata dot-termination.
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grep -vE '^\$(ORIGIN|TTL)|^;' "$src" \
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| grep -vE '[[:space:]]NS[[:space:]]+ns[12]\.vultr\.com\.?[[:space:]]*$' \
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| awk '
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NF == 0 { print; next }
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{
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# (a) Detect Vultr-style apex line: leading whitespace, then TTL,
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# then "IN". Prepend "@" so the owner is explicit.
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if ($0 ~ /^[[:space:]]+[0-9]+[[:space:]]+IN[[:space:]]/) {
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sub(/^[[:space:]]+/, "@\t", $0)
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}
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# (b) Dot-terminate trailing hostname for NS/CNAME/MX rdata.
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type = ""
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for (i = 1; i <= NF; i++) {
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if ($i == "NS" || $i == "CNAME" || $i == "MX") { type = $i; break }
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}
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if (type != "") {
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target = $NF
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if (index(target, ".") > 0 && substr(target, length(target), 1) != ".") {
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sub(/[[:space:]]+$/, "", $0)
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print $0 "."
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next
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}
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}
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print
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}
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'
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} > "$dst"
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count=$((count + 1))
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done
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echo "Prepared ${count} zone files in ${DST_DIR}/ (serial=${SERIAL})"
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