full_reference_config.yaml

# File:    full_reference_config.yaml
# Version: 1.80.0
# Updated: 21-Apr-2026 18:35 CEST
#
# Description:
#   Complete reference configuration for sdproxy. Every supported option is
#   documented here with its type, default, and guidance notes. Copy this file,
#   strip what you don't need, and adjust to taste. The comments are the manual.
#
# Changes:
#   1.80.0 - [DOCS] Updated `secure` upstream strategy documentation to reflect 
#            the new fault-tolerant behavior of `loose` mode filtering.
#   1.79.0 - [DOCS] Updated budget terminology to accurately reflect the interactions 
#            of `FREE`, `ALLOW`, and `unlimited` limits with umbrella budgets.
#   1.78.0 - [FEAT] Added `support_ip_version` to selectively filter resource 
#            loading for IPv4 and IPv6 globally.

# =============================================================================
# SERVER
# =============================================================================

server:
  # Listener addresses. Multiple addresses supported per protocol.
  # Omit any section to disable that protocol entirely.
  listen_udp: ["0.0.0.0:53", "127.0.0.1:5353"]
  listen_tcp: ["0.0.0.0:53"]
  listen_dot: ["0.0.0.0:853"]
  listen_doh: ["0.0.0.0:443"]   # HTTP/1.1, HTTP/2, and HTTP/3 (QUIC)
  listen_doq: ["0.0.0.0:853"]   # DNS over QUIC — RFC 9250

  # Select which IP versions to support globally in resource loaders.
  # This affects Category lists, ASN databases, Hosts files, and DHCP Leases.
  # Any IP or subnet found in these sources that does not match this setting
  # will be discarded during the loading phase to save memory and CPU.
  #
  # Options: "both" (default), "ipv4", "ipv6".
  #
  # Note: This setting can be overridden at runtime via command-line flags
  #       (-4 or -ipv4 for IPv4-only, -6 or -ipv6 for IPv6-only). If both IPv4 
  #       and IPv6 flags are passed, it resolves to "both".
  support_ip_version: "both"

  # Number of goroutines in the UDP worker pool.
  # On Linux each worker gets its own SO_REUSEPORT socket — no shared channel.
  # Default: 10. Tune to number of CPU cores on fast hardware.
  udp_workers: 10

  # TLS certificate and private key for DoT / DoH / DoQ.
  # When absent and any encrypted listener is configured, a self-signed
  # certificate is generated automatically at startup.
  tls_cert: "/etc/sdproxy/cert.pem"
  tls_key:  "/etc/sdproxy/key.pem"

  # Hard memory ceiling in MiB, applied via runtime/debug.SetMemoryLimit.
  # Triggers aggressive GC before the process hits the limit.
  # 0 = disabled (Go runtime default). Recommended for routers: 64–128.
  memory_limit_mb: 64

  # ---------------------------------------------------------------------------
  # DNS ACCESS CONTROL LISTS (Public Resolver Hardening)
  # ---------------------------------------------------------------------------
  # Limit which IPs are allowed to query this DNS server. Crucial for limiting
  # exposure if bound to public interfaces. Accepts IPs or CIDRs.
  # Queries from denied/unauthorized IPs are silently dropped.
  acl:
    # Explicitly denied IPs or Subnets (e.g. ["1.2.3.4", "10.10.10.0/24"]).
    # Overrides allow list.
    deny: []
    # Explicitly allowed IPs or Subnets. If left empty, ALL IPs are allowed
    # (provided they are not in the deny list).
    # e.g., ["192.168.0.0/16", "10.0.0.0/8", "127.0.0.1"]
    allow: []

  # ---------------------------------------------------------------------------
  # PER-CLIENT RATE LIMITING (Public Resolver Hardening)
  # ---------------------------------------------------------------------------
  # Essential when exposing sdproxy to the public internet. Prevents malicious
  # actors from exhausting global query slots, participating in amplification
  # attacks, or causing Denial of Service. Violators are silently dropped.
  rate_limit:
    enabled: false
    # Sustained queries per second allowed per client.
    qps: 20
    # Maximum burst size allowed before the limit is enforced.
    burst: 100
    # Subnet grouping for rate limiting. Attackers often rotate IPs within a /64
    # or /24. These masks group traffic by prefix.
    # Default: 32 (IPv4) and 128 (IPv6) - tracks individual IPs.
    ipv4_prefix_length: 32
    ipv6_prefix_length: 128
    # Cap the absolute maximum number of tracked IPs/subnets to prevent 
    # out-of-memory (OOM) situations during intense spoofed source-IP floods. 
    # Default: 1000.
    max_tracked_ips: 1000

    # IPs or Subnets that explicitly bypass rate limiting and the penalty box entirely.
    # These entries will have unlimited access and will never be blackholed.
    # E.g., ["127.0.0.1", "192.168.1.50", "10.0.0.0/8"]
    exempt: []
    
    # ── PENALTY BOX ────────────────────────────────────────────────────────
    # Automatically blackholes clients who repeatedly violate rate limits or 
    # transmit malformed/exploitative payloads. While in the penalty box, ALL 
    # traffic from that IP/Subnet is silently dropped to preserve I/O capacity.
    penalty_box:
      enabled: true
      # How many consecutive dropped queries trigger a blackhole event. 
      # Sending malformed payloads incurs an instant ban regardless of threshold.
      strike_threshold: 100
      # Duration (in minutes) to keep the client completely blackholed.
      ban_duration_min: 15

  # ---------------------------------------------------------------------------
  # DNS REBINDING PROTECTION (Public Resolver Hardening)
  # ---------------------------------------------------------------------------
  # Protects users and internal networks from DNS Rebinding and SSRF attacks.
  # When true, sdproxy drops any upstream response containing private/bogon IPs
  # (RFC1918, loopback, ULAs) returning NXDOMAIN. Default: false.
  rebinding_protection: false

  # Drop all AAAA (IPv6) query responses, returning NOERROR with an empty
  # answer section. Useful on IPv4-only networks to avoid IPv6 resolution
  # delays on clients that still try. Default: false.
  filter_aaaa: false

  # When true, IP addresses in A/AAAA responses from upstream are checked
  # against parental category allow/blocklists. If an IP matches a category
  # blocked for the client, it is filtered out of the response. If all IPs are
  # filtered, the query is blocked completely. Default: false.
  filter_ips: false

  # When true, PTR queries for IPs that do not appear in any identity source
  # (hosts files / leases) return NXDOMAIN instead of being forwarded.
  # Prevents upstream PTR leakage of LAN addresses. Default: false.
  strict_ptr: false

  # When true, CNAME chains in upstream responses are collapsed into a single
  # A/AAAA record (the final resolved IP only). Reduces response size and
  # prevents CNAME-based tracking. Default: false.
  flatten_cname: false

  # When true, sdproxy checks the target domain-names of CNAME, MX, NS, PTR, 
  # SRV, SOA, SVCB, and HTTPS records in responses against domain_policy and 
  # parental block rules. If a target is blocked, the query is treated as blocked. 
  # This check is performed before cname-flattening. Default: false.
  target_name: false

  # When true, responses are trimmed to include only the records that directly
  # answer the query — no additional or authority records are forwarded to the
  # client. Default: false.
  minimize_answer: false

  # When true, all IANA-obsolete / withdrawn / experimental query types (e.g.
  # MD, WKS, A6) are automatically blocked with NOTIMP. Individual types can
  # still be overridden via rtype_policy:. Default: false.
  block_obsolete_qtypes: false

  # DDR — Discovery of Designated Resolvers (RFC 9462).
  # Advertises encrypted resolver endpoints to clients that support DDR.
  ddr:
    enabled:   true
    hostnames: ["dns.home.arpa"]
    ipv4:      ["192.168.1.1"]    # When left empty, the IP of the incomimg
    ipv6:      []                 # interface is used in the response/spoof.

  # ---------------------------------------------------------------------------
  # UPSTREAM EXECUTION
  # ---------------------------------------------------------------------------

  # Global Upstream Selection Strategy. When an upstream group has multiple unique 
  # IP addresses, this specifies how sdproxy uses them to resolve queries.
  #   "stagger"     — Default. Launch query 1. If no response is received within
  #                   `upstream_stagger_ms`, fire query 2. Fastest to respond wins.
  #   "round-robin" — Cycles sequentially through all available upstreams.
  #   "random"      — Randomly selects an upstream from the group.
  #   "fastest"     — Tracks Exponential Moving Averages (EMA) of RTT per upstream.
  #                   Sticks to the fastest one with a 5% Epsilon-Greedy exploration 
  #                   rate to test other endpoints.
  #   "secure"      — Queries ALL upstreams simultaneously to enforce consensus validation.
  #                   The specific behavior is controlled by the group's `mode` setting:
  #                     `loose` (Default): Dynamically filters out connection timeouts, 
  #                                        execution errors, and any RCODE other than NOERROR 
  #                                        or NXDOMAIN. Consensus is built purely from the 
  #                                        healthy, valid responses that successfully arrive.
  #                     `strict`: Demands 100% participation. All dialed upstreams MUST respond 
  #                               flawlessly. Any timeout or failure instantly aborts the query. 
  #                               Additionally, it deep-inspects the end-answers (e.g., IPs 
  #                               behind CNAMEs) to ensure they are mathematically identical 
  #                               across all upstreams.
  #                   In both modes, NOERROR answers cannot be mixed with empty answers, and 
  #                   NULL-IPs (0.0.0.0 / ::) immediately void the consensus.
  upstream_selection: "stagger"

  # Upstream stagger — delay (ms) between the first upstream probe and
  # subsequently spawned parallel probes. 0 = sequential (first upstream wins
  # or fails before the next is tried). >0 = racing: all probes fire within
  # stagger_ms of each other; fastest response wins. Default: 0.
  # NOTE: Only applies when using the "stagger" strategy.
  upstream_stagger_ms: 0

  # Hard per-exchange deadline for upstream DNS calls, in milliseconds.
  # When set, each call to an upstream receives a context.WithTimeout so a slow 
  # or unreachable upstream cannot hold a goroutine indefinitely.
  #
  # Without this setting the upstream's own TCP/TLS connect timeout governs
  # (typically 3–30 s depending on OS and transport). That is safe for stable
  # connections but can cause goroutine pile-up when a DoH server is slow or
  # a QUIC path has high packet loss.
  #
  # Guidelines:
  #   0          — no deadline (default; keep for stable single-upstream setups)
  #   3000–5000  — recommended for home routers with WAN upstreams
  #   1000–2000  — aggressive; only useful with stagger racing so a fast
  #                upstream wins before the timeout fires on slower ones
  upstream_timeout_ms: 0

  # Global bootstrap DNS servers for resolving upstream hostnames that have no
  # per-URL bootstrap IPs appended with #. Accepts "ip" or "ip:port" format.
  # Entries without a port default to :53. Per-URL bootstrap IPs always win.
  bootstrap_servers:
    - "1.1.1.1"
    - "9.9.9.9"

  # TTL (seconds) placed on every DNS record that sdproxy synthesises locally.
  # Applies to:
  #   • DDR responses  — SVCB, A, AAAA, and HTTPS records for _dns.resolver.arpa
  #                      and resolver hostnames (RFC 9462 / RFC 9461).
  #   • Local identity — A, AAAA, and PTR answers served from hosts/lease files.
  #   • NXDOMAIN policy SOA — the fake SOA authority record injected into
  #                      domain_policy NXDOMAIN replies so stub resolvers cache
  #                      the negative response for this long (RFC 2308 §3).
  #                      rtype_policy REFUSED/NOTIMP replies carry no RRs and
  #                      are unaffected — those codes have no caching semantics.
  #
  # 0 = use built-in default of 60 s.
  # Low values (e.g. 10) help during testing; 300–600 suits stable production
  # setups. Parental-block TTL is controlled separately by the parental: section.
  synthetic_ttl: 60

# =============================================================================
# LOGGING
# =============================================================================

logging:
  # Per-query log lines (e.g. "[DNS] [udp] 192.168.1.5 -> example.com A | UPSTREAM").
  # Set false to suppress per-query lines entirely — only init/error/parental
  # lines remain. Handy on busy home routers to reduce log volume. Default: true.
  log_queries: true

  # Strip the date/time prefix from all log lines (log.SetFlags(0)).
  # Useful when the process supervisor (systemd, procd) already timestamps logs.
  # Default: false.
  strip_time: false

  # Include Autonomous System Number (ASN), Owner Name, and Country of the client 
  # IP address in the logs (when identity.ipinfo_asn is configured).
  # Default: false.
  log_asn_details: false

# =============================================================================
# CACHE
# =============================================================================

cache:
  enabled: true

  # Maximum number of DNS responses to cache. Each entry is ~300–600 bytes.
  # 5000 entries ≈ 2–3 MB. Tune to available RAM. Default: 5000.
  size: 5000

  # Minimum TTL (seconds) to enforce on cached responses, overriding shorter
  # upstream TTLs. 0 = honour upstream TTL as-is. Default: 0.
  min_ttl: 0

  # Maximum TTL (seconds) to cap on cached responses. 0 = no cap. Default: 0.
  # Useful to force periodic re-resolution of high-TTL records.
  max_ttl: 0

  # TTL (seconds) to apply to NXDOMAIN and NODATA (empty answer) responses.
  # 0 = use the TTL from the SOA record in the upstream response.
  # When no SOA is present, falls back to min_ttl. Default: 0.
  negative_ttl: 0

  # Extra seconds beyond TTL expiry during which a stale entry may still be
  # served (RFC 8767 serve-stale). A background revalidation fires immediately.
  # 0 = disabled (default). Recommended: 30–300 for resilience on flaky WANs.
  stale_ttl: 0

  # Background prefetch: seconds before TTL expiry to trigger a refresh for
  # popular entries. 0 = disabled. Pair with prefetch_min_hits. Default: 0.
  # Recommended pairing: prefetch_before: 10, prefetch_min_hits: 2
  prefetch_before: 0

  # Minimum number of cache hits an entry must accumulate before it qualifies
  # for prefetch. Prevents pre-fetching one-off queries. Default: 0.
  # Recommended pairing: prefetch_before: 10, prefetch_min_hits: 2
  prefetch_min_hits: 0

  # How often (seconds) the background sweeper scans all cache shards for
  # entries whose stale window has passed and reclaims their memory.
  # 0 = default 60 s.
  #
  # The sweeper does NOT affect query correctness — CacheGet rejects expired
  # entries on read regardless. The sweeper only frees memory.
  #
  # Lower values reclaim RAM faster but add background CPU:
  #   15–30 s — low-RAM routers (32–64 MB) or large cache sizes
  #   60 s    — default, suitable for most home routers
  #   120 s+  — quiet environments where memory is not a concern
  sweep_interval_s: 60

  # NXDOMAIN, rtype_policy blocks, filter_aaaa, strict_ptr, obsolete qtypes.
  # On repeat queries the cache hit at step 3 skips domain walks, policy
  # map lookups, and qtype checks entirely. Default: false.
  cache_synthetic: false

  # Cache local A/AAAA/PTR responses from hosts_files / *_leases sources.
  # WARNING: only safe when synthetic_ttl ≤ identity.poll_interval.
  # If synthetic_ttl > poll_interval, stale local addresses may be served
  # in the gap between a file change and the next poll. Default: false.
  cache_local_identity: false

  # Cache upstream NXDOMAIN and NODATA (NOERROR + empty answer) responses.
  # Set false to always forward negative lookups upstream — useful when
  # upstream blocklists change frequently. Default: true (RFC 2308).
  cache_upstream_negative: true

  # Sort A/AAAA IP addresses in the Answer section before sending them to the client.
  # Because the cache is updated with the new order, this allows true round-robin 
  # or random rotation of IP lists per DNS request.
  # Only affects record sets that contain 2 or more A/AAAA responses.
  # Valid options: "none", "round-robin", "random", "ip-sort". Default: "none".
  answer_sort: "none"

# =============================================================================
# IDENTITY
# =============================================================================
# Maps IP addresses and MAC addresses to hostnames using local files.
# Enables:
#   • Local A/AAAA/PTR responses without upstream forwarding.
#   • Client name resolution for log lines and {client-name} URL substitution.
#   • MAC-to-name mapping for ARP-identified clients.
#
# All file formats are parsed incrementally — only changed files are re-read.

identity:
  # Standard hosts file(s) — one IP per line followed by one or more
  # space-separated hostnames. Inline comments (#) are stripped.
  hosts_files:
    - "/etc/hosts"
  # hosts_files:
  #   - "/etc/hosts"
  #   - "/tmp/hosts/odhcpd"   # OpenWrt dnsmasq+odhcpd

  # dnsmasq flat-file lease database.
  # Format: <expiry> <mac> <ip> <hostname> <client-id> (one per line).
  # Hostname '*' means the client didn't supply one — entry is skipped.
  dnsmasq_leases: []
  # dnsmasq_leases:
  #   - "/tmp/dhcp.leases"

  # ISC DHCP block-structured lease files.
  # Only active/static bindings are imported; last active block for a given
  # IP wins (ISC append semantics).
  isc_leases: []
  # isc_leases:
  #   - "/var/lib/dhcp/dhcpd.leases"

  # Kea DHCP4 CSV lease files.
  # Only state=0 (active) rows are imported. Header row is skipped.
  kea_leases: []
  # kea_leases:
  #   - "/var/lib/kea/kea-leases4.csv"

  # odhcpd internal state files.
  # Used when running odhcpd standalone (no dnsmasq).
  # Hostname '-' means no name was supplied — entry is skipped.
  odhcpd_leases: []
  # odhcpd_leases:
  #   - "/var/lib/odhcpd/dhcp.leases"

  # IPinfo ASN Databases (JSON or GZ)
  # Allows routing clients dynamically based on their Autonomous System.
  # Supports both the Free tier (IP-Ranges) and Lite tier (CIDR networks).
  # Get free databases from:
  #   Free: https://ipinfo.io/data/free/asn.json.gz?token=YOUR_TOKEN
  #   Lite: https://ipinfo.io/data/ipinfo_lite.json.gz?token=YOUR_TOKEN
  # Supports both remote URLs and local files. GZIP is auto-detected natively.
  ipinfo_asn: []
  # ipinfo_asn:
  #   - "https://ipinfo.io/data/ipinfo_lite.json.gz?&token=YOUR_TOKEN"
  #   - "/etc/sdproxy/asn.json"

  # Directory where downloaded and processed IPinfo ASN databases are cached.
  # This makes the databases persistent across reboots and speeds up startup.
  # If empty, remote databases are kept only in memory.
  # Default: "/var/lib/sdproxy/asn"
  asn_cache_dir: "/var/lib/sdproxy/asn"

  # How often to check for newer versions of the IPinfo ASN databases.
  # Accepts Go duration strings (e.g., "6h", "24h").
  # Default: "6h". Set to "0s" or empty to load once at startup and never poll.
  asn_poll_interval: "6h"

  # FastStart: when true, sdproxy will immediately start answering queries at boot
  # even if ASN databases have not finished downloading/parsing. This makes
  # startup non-interruptive, but some traffic might lack ASN routing initially. 
  # When false, sdproxy waits for the ASN DB to load before starting.
  # Default: false.
  asn_fast_start: false

  # How often (seconds) to re-check all local identity files (leases/hosts) for changes.
  # mtime is checked first — unchanged files are never re-read or re-parsed.
  # 0 = load once at startup and never poll again.
  poll_interval: 60

# =============================================================================
# QUERY-TYPE POLICY
# =============================================================================
# Maps specific DNS RR query types to an immediate action or RCODE.
# Fired before cache, identity, DDR, and upstream on every query.
#
# Valid actions: "BLOCK" (null-ip/NXDOMAIN), "DROP" (silently ignore), or any standard DNS RCODE (e.g., "REFUSED", "NXDOMAIN").
#
# Note: You can group multiple QTypes by separating them with commas.

rtype_policy:
  "ANY, AXFR, IXFR": "DROP"
  "HINFO, RESINFO":  "NOTIMP"

# You can also supply an external file with a list of RTypes for a specific action.
# The file should contain one RType per line. Empty lines and inline comments (#) are ignored.
# rtype_policy_files:
#   "/etc/sdproxy/drop_rtypes.txt": "DROP"
#   "/etc/sdproxy/block_rtypes.txt": "BLOCK"

# =============================================================================
# DOMAIN POLICY
# =============================================================================
# Maps domain suffixes to an immediate action or RCODE — no upstream forwarding.
# A single entry covers the apex AND all subdomains.
# Valid actions: "BLOCK" (null-ip/NXDOMAIN), "DROP" (silently ignore), or any standard DNS RCODE.
#
# Fired before DDR, identity, and routing.
#
# IMPORTANT: domain_policy fires BEFORE domain_routes. Don't add zones here
# that are also in domain_routes — the block wins and routing never fires.
#
# IMPORTANT: most-specific-wins semantics apply. "sub.example.com" takes
# precedence over "example.com" when both are present.
#
# Note: You can group multiple Domains by separating them with commas.

domain_policy:
  # =================================================================================================
  # DOCUMENTATION, EXAMPLES & TESTING
  # Domains reserved strictly for use in documentation, sample code, and local testing.
  # =================================================================================================
  "example, example.com, example.net, example.org": "NXDOMAIN" # RFC 2606 | Reserved for documentation and examples
  "invalid, test":                                  "NXDOMAIN" # RFC 6761 | Reserved for obviously invalid names and testing

  # =================================================================================================
  # LOCAL & PRIVATE NETWORK SUFFIXES
  # Domains commonly used (formally or informally) for local routing, home networks, and LANs.
  # =================================================================================================
  "belkin, router, modem, gw":                           "NXDOMAIN" # Common gateway/captive portal administration sinkholes
  "corp, domain, internal, intranet, priv, private, main": "NXDOMAIN" # Common internal network suffixes
  "lan, localdomain, workgroup":                         "NXDOMAIN" # Informally used for local area networks and Windows
  "home.arpa, localhost, local":                         "NXDOMAIN" # RFC 8375/6761/6762 | Special-use and loopback routing

  # =================================================================================================
  # IPv4 REVERSE MAPPING & SPECIAL BLOCKS (in-addr.arpa)
  # Reverse DNS zones for reserved, private, multicast, and special-purpose IPv4 ranges.
  # =================================================================================================
  "0.in-addr.arpa, 127.in-addr.arpa": "NXDOMAIN" # RFC 1122 | IPv4 "This host on this network" and Loopback 
  "10.in-addr.arpa":                  "NXDOMAIN" # RFC 6761 | Private IPv4 reverse mapping (10.0.0.0/8)
  "254.169.in-addr.arps":             "NXDOMAIN" # RFC 3927 | IPv4 Link-Local (169.254.0.0/16) reverse mapping
  
  # Grouped 172.16.0.0/12 block - RFC 6761 | Private IPv4 reverse mapping (172.16.0.0/12)
  "16.172.in-addr.arpa, 17.172.in-addr.arpa, 18.172.in-addr.arpa, 19.172.in-addr.arpa, 20.172.in-addr.arpa, 21.172.in-addr.arpa, 22.172.in-addr.arpa, 23.172.in-addr.arpa, 24.172.in-addr.arpa, 25.172.in-addr.arpa, 26.172.in-addr.arpa, 27.172.in-addr.arpa, 28.172.in-addr.arpa, 29.172.in-addr.arpa, 30.172.in-addr.arpa, 31.172.in-addr.arpa": "NXDOMAIN"
  
  "170.0.0.192.in-addr.arpa, 171.0.0.192.in-addr.arpa": "NXDOMAIN"  # RFC 8880 | Special-purpose IPv4 reserved for NAT64/DNS64
  "168.192.in-addr.arpa":                               "NXDOMAIN"  # RFC 6761 | Private IPv4 reverse mapping (192.168.0.0/16)
  "100.51.198.in-addr.arpa, 113.0.203.in-addr.arpa":    "NXDOMAIN"  # RFC 5737 | Reverse mapping for TEST-NET-2/3
  
  # Grouped IPv4 Multicast (224-239) - RFC 5771
  "224.in-addr.arpa, 225.in-addr.arpa, 226.in-addr.arpa, 227.in-addr.arpa, 228.in-addr.arpa, 229.in-addr.arpa, 230.in-addr.arpa, 231.in-addr.arpa, 232.in-addr.arpa, 233.in-addr.arpa, 234.in-addr.arpa, 235.in-addr.arpa, 236.in-addr.arpa, 237.in-addr.arpa, 238.in-addr.arpa, 239.in-addr.arpa": "NXDOMAIN"

  # Grouped IPv4 Reserved/Class E (240-254) - RFC 3330
  "240.in-addr.arpa, 241.in-addr.arpa, 242.in-addr.arpa, 243.in-addr.arpa, 244.in-addr.arpa, 245.in-addr.arpa, 246.in-addr.arpa, 247.in-addr.arpa, 248.in-addr.arpa, 249.in-addr.arpa, 250.in-addr.arpa, 251.in-addr.arpa, 252.in-addr.arpa, 253.in-addr.arpa, 254.in-addr.arpa": "NXDOMAIN"
  
  "255.in-addr.arpa": "NXDOMAIN" # RFC 919 | IPv4 Limited Broadcast address reverse mapping (255.0.0.0/8)

  # =================================================================================================
  # IPv6 REVERSE MAPPING (ip6.arpa)
  # Reverse DNS zones for IPv6 addresses and Link-Local blocks.
  # =================================================================================================
  "c.f.ip6.arpa, d.f.ip6.arpa":                                     "NXDOMAIN" # RFC 4193 | IPv6 Unique Local Address (ULA) reverse mapping
  "8.e.f.ip6.arpa, 9.e.f.ip6.arpa, a.e.f.ip6.arpa, b.e.f.ip6.arpa": "NXDOMAIN" # RFC 6762 | IPv6 Link-Local (fe80::/10) reverse mapping, mDNS restricted

  # =================================================================================================
  # INFRASTRUCTURE, PROTOCOL & SERVICE DISCOVERY
  # Reserved namespaces used for DNS routing, protocol discovery, and server identification.
  # =================================================================================================
  "bind, server":                                 "DROP"      # RFC 4892 | Identifying a server instance
  "as112.arpa":                                   "NXDOMAIN"  # RFC 7535 | Sinking DNS traffic for reverse IP lookups
  "in-addr-servers.arpa, ip6-servers.arpa":       "NXDOMAIN"  # RFC 5855 | Nameservers for the reverse domains
  "eap-noob.arpa, eap.arpa":                      "NXDOMAIN"  # Out-Of-Band authentication and EAP framework
  "resolver.arpa, service.arpa":                  "NXDOMAIN"  # RFC 9462/9665 | Discovery of Designated Resolvers (DDR) / SRP
  "uri.arpa, urn.arpa":                           "NXDOMAIN"  # RFC 3405 | Resolving URIs/URNs via DDDS
  "6tisch.arpa, ipv4only.arpa, iris.arpa, wpad":  "NXDOMAIN"  # Miscellanous Infrastructure / Discovery

  # =================================================================================================
  # ALTERNATIVE NAMESPACES, WEB3 & DARKNETS
  # Pseudo-TLDs intended for resolution outside the standard global DNS hierarchy.
  # =================================================================================================
  "alt, exit, i2p, onion":                                           "NXDOMAIN" # Alt networks, Tor, and I2P routing
  "ape, basenji, bitcoin, crypto, dao, eth, nft, onchain, polygon, sol, wallet, x": "NXDOMAIN" # Web3 and Crypto Onchain Namespaces

  # =================================================================================================
  # OBSOLETE HISTORICAL PSEUDO-TLDS & DELETED TLDs
  # Legacy network namespaces and early internet domains that are no longer in active use.
  # =================================================================================================
  "bitnet, csnet, decnet, fidonet, mailnet, nato, uucp": "NXDOMAIN"

  # =================================================================================================
  # OBSOLETE & ANOMALOUS COUNTRY CODE TLDs (ccTLDs)
  # Retired domains for dissolved nations, plus anomalous legacy ccTLDs (like .su) often sinkholed.
  # =================================================================================================
  "an, cs, dd, su, tp, um, yu, zr": "NXDOMAIN"

  # =================================================================================================
  # EXCEPTIONALLY RESERVED COUNTRY CODES (Not Delegated)
  # ISO 3166-1 codes that are active/reserved but strictly prohibited from global DNS delegation.
  # =================================================================================================
  "cp, dg, ea, ez, fx, ic, ta, un": "NXDOMAIN"

# You can also supply an external file with a list of Domains for a specific action.
# The file should contain one domain/suffix per line. Empty lines and inline comments (#) are ignored.
# domain_policy_files:
#   "/etc/sdproxy/adservers.txt": "NXDOMAIN"

# =============================================================================
# UPSTREAM GROUPS
# =============================================================================
# The "default" group is required — all other groups are optional.
#
# TWO YAML FORMS — both are valid:
#
#   Traditional (List of Strings):
#     default:
#       - "udp://1.1.1.1:53"
#
#   Advanced (Mapped with Strategy override per-group):
#     default:
#       strategy: "fastest"
#       servers:
#         - "udp://1.1.1.1:53"
#
# PROTOCOL SCHEMES
#   udp://host:port    Plain DNS over UDP (RFC 1035). Default port: 53.
#   tcp://host:port    Plain DNS over TCP (RFC 1035). Default port: 53.
#   dot://host:port    DNS over TLS — RFC 7858. Default port: 853.
#   doh://host/path    DNS over HTTPS/2 with HTTP/1.1 fallback — RFC 8484.
#   doh3://host/path   DNS over HTTP/3 / QUIC.
#   doq://host:port    DNS over QUIC — RFC 9250. Default port: 853.
#
# OUTBOUND HTTP METHOD (DoH / DoH3 only)
#   Append +get or +post to the URL path (before #) to control the HTTP method.
#   Default is POST. +get uses RFC 8484 §4.1 GET with base64url-encoded query.
#   Example: "doh://cloudflare-dns.com/dns-query+get#1.1.1.1,1.0.0.1"
#
# PER-URL BOOTSTRAP IPs (appended after #, comma-separated)
#   Bypasses DNS for the upstream hostname. Always takes precedence over
#   bootstrap_servers. Required for {client-name} in hostnames.
#   Syntax: "scheme://host/path[+get|+post]#ip1,ip2"
#
# {client-name} SUBSTITUTION
#   The literal string {client-name} in a URL is replaced at query time with
#   the DHCP hostname of the querying device (resolved via identity tables).
#   Useful for upstream resolvers that support per-client filtering profiles.
#
# PRIVACY NOTE
#   All outgoing queries have EDNS0 options stripped (removes ECS, cookies, etc.).
#   Encrypted upstreams additionally get RFC 7830/8467 padding applied.
#   UDP payload size is always normalised to 4096 bytes before forwarding.

upstreams:
  default:
    - "udp://1.1.1.1:53"
    - "doh://cloudflare-dns.com/dns-query#1.1.1.1,1.0.0.1"
  kids:
    - "tcp://1.1.1.3:53"
    - "doh://doh.controld.com/{client-name}#76.76.2.0,76.76.10.0"
  secure:
    strategy: "secure"
    preference: "ordered" # Valid options: "fastest" (default) or "ordered" (primary server wins)
    mode: "strict"        # Valid options: "loose" (default) or "strict" (deep inspection of end-answers)
    servers:
      - "dot://dns.quad9.net:853#9.9.9.9,149.112.112.112"
      - "doh3://security.cloudflare-dns.com/dns-query+get#1.1.1.2,1.0.0.2"
  local_network:
    - "udp://192.168.1.1:53"

# =============================================================================
# CLIENT-BASED ROUTES (MAC, MAC glob, IP, CIDR, ASN, Name, SNI, Path)
# =============================================================================
# Maps a client identifier to a specific upstream group and/or a parental
# control group. 
#
# PRECEDENCE (when multiple keys match the same client):
#   MAC exact  >  MAC glob  >  IP  >  CIDR  >  ASN  >  Client-Name  >  SNI  >  Path
#
# Note: You can group multiple identifiers by separating them with commas.
#
# FIELDS:
#   upstream     — upstream group for this client. When absent and group: is
#                  set, the group's upstream is used as the default.
#                  Effective precedence: route upstream: > group upstream: > "default".
#   client_name  — overrides the DHCP/hosts-derived name for logs and
#                  {client-name} URL substitutions (optional).
#   bypass_local — when true, local A/AAAA/PTR answers from hosts/leases are
#                  skipped; every query goes upstream. Client naming for logs
#                  and {client-name} still works. Default: false.
#   group        — links this device to a parental control profile.
#
# ── KEY FORMATS ──────────────────────────────────────────────────────────────
#
# MAC ADDRESS (exact)
#   Standard colon-separated form: "aa:bb:cc:dd:ee:ff"
#   Case-insensitive — normalised to lowercase at startup.
#
#   PRIVATE / RANDOMIZED MAC ADDRESSES
#     Modern OSes (iOS, Android, Windows 11) randomize MAC addresses by default
#     to prevent tracking. This breaks static MAC-based routing and budget profiles.
#     To reliably track specific devices (e.g. for kids), you must DISABLE
#     "Private Wi-Fi Address" / "MAC Randomization" in the device's Wi-Fi settings
#     specifically for your home network.
#     Alternatively, you can catch ALL randomized MAC addresses globally using a glob.
#     Randomized (Locally Administered) MACs always have the second character as
#     "2", "6", "a" or "e". See the 'private/privacy macs' example below.
#
# MAC ADDRESS (glob)
#   Same six-octet colon structure but with '?' and/or '*' wildcards.
#
# IP ADDRESS / CIDR SUBNET
#   IPv4 or IPv6: "192.168.1.50", "2001:db8::/32"
#
# AUTONOMOUS SYSTEM NUMBER (ASN)
#   Dynamically routes clients based on their ASN.
#   Requires identity.ipinfo_asn to be populated with an IPinfo database.
#   Case-insensitive format: "AS1136"
#
# SNI / HOSTNAME (DoT, DoH, DoQ)
#   Matches the TLS Server Name Indication the client used to connect to sdproxy.
#   Must be prefixed with "sni:". Example: "sni:doh.example.com"
#
# URL PATH (DoH, DoH3)
#   Matches the HTTP request path.
#   Must start with "/" or be prefixed with "path:". Example: "/dns-query-kids"
#
# CLIENT NAME
#   The DHCP/hosts hostname of the device. Catch-all for any other string.
#   Requires identity: to be configured with at least one hosts or lease file.

routes:
  # ── Exact MAC & Grouped mixed properties ──────────────────────────────────
  "cc:dd:ee:ff:00:11, 10.0.0.0/24, AS1136, sni:doh.secure.com":
    upstream: "secure"

  # ── MAC glob & URL Path  ──────────────────────────────────────────────────
  "aa:bb:cc:??:??:??, /dns-query-kids":
    upstream: "kids"

  # ── Client name — matched against DHCP lease / hosts hostname ─────────────
  "alice-iphone, bob-ipad, charlie-mac":
    group:    "kids"

  # ── private/privacy macs ──────────────────────────────────────────────────
  "?2:*:*:*:*:*, ?6:*:*:*:*:*, ?a:*:*:*:*:*, ?e:*:*:*:*:*":
    group:    "private"
    bypass_local: true

# You can also supply external files containing lists of identifiers.
# One identifier per line. Empty lines and inline comments (#) are ignored.
# routes_files:
#   "/etc/sdproxy/kids_devices.txt":
#     group: "kids"
#   "/etc/sdproxy/guest_subnets.txt":
#     upstream: "default"
#     bypass_local: true

# =============================================================================
# DOMAIN-BASED ROUTES
# =============================================================================
# Suffix matching checked before cache and upstream selection.
# NOTE: domain_policy is checked BEFORE domain_routes.
#
# TWO YAML FORMS — both are valid and can be mixed freely:
#
#   Compact (original form — unchanged, fully supported):
#     "domain": "upstream_group"
#
#   Expanded (required when setting bypass_local: true):
#     "domain":
#       upstream:     "upstream_group"
#       bypass_local: true
#
# PRECEDENCE: when both a MAC route and a domain route match the same query,
# the domain route's upstream and bypass_local values win.
#
# Note: You can group multiple Domains by separating them with commas.

domain_routes:
  # Compact form — local identity answers enabled (bypass_local defaults false).
  "lan, home.arpa, corp.internal": "local_network"

  # Expanded form — always go to upstream, never answer from local hosts/leases.
  "youtube.com, netflix.com, hulu.com":
    upstream:     "kids"
    bypass_local: true

# You can also supply external files containing lists of domains for routing.
# One domain per line. Empty lines and inline comments (#) are ignored.
# domain_routes_files:
#   "/etc/sdproxy/work_domains.txt":
#     upstream: "secure"
#     bypass_local: true

# =============================================================================
# GROUPS
# =============================================================================
# Parental control profiles. Devices are linked via routes[mac].group above.
# The entire groups: section can be omitted — zero overhead when absent.
#
# Fields:
#   upstream        — upstream group for all MACs in this group.
#   bypass_local    — default bypass_local for all MACs in this group.
#
#   schedule        — restrict DNS access to one or more time windows.
#
#                     SINGLE STRING (old form — fully backward-compatible):
#                       schedule: "HH:MM-HH:MM"
#                     Access is allowed inside this window every day.
#                     Midnight-spanning ranges work: "22:00-07:00".
#
#                     LIST OF ENTRIES (new form — multiple windows):
#                       schedule:
#                         - "[<days>] HH:MM-HH:MM"
#                         - "[<days>] HH:MM-HH:MM"
#                     Access is open when ANY entry matches (union semantics).
#
#                     DAY SPEC SYNTAX (placed before the time range):
#                       weekdays        — Monday through Friday
#                       weekend         — Saturday and Sunday
#                       mon-fri         — inclusive range (wraps week boundary)
#                       mon,wed,fri     — explicit comma-separated list
#                       mon / tuesday   — single day (3-letter abbrev or full)
#
#   block_ttl       — TTL (seconds) on blocked responses for this group.
#                     0 = use the global parental.block_ttl (default 20s).
#
#   budget_tracking — "group" (default) or "device".
#
#   budget          — daily accumulative time limits. Keys:
#                       "total"       — overall daily screen time, OR the baseline
#                                       default action for the entire group. If set 
#                                       to ALLOW, BLOCK, FREE, or LOG, it applies to
#                                       everything *unless* a specific category overrides it.
#                       <category>    — any category key under categories:. Explicitly
#                                       configured categories strictly bypass the "total" default.
#                     Values (case-insensitive):
#                       "<duration>"  — Go duration string: "2h", "90m".
#                       "unlimited"   — no specific limit for this category, but visiting it still drains the "total" budget.
#                       "BLOCK"       — permanently blocks all queries. No reset.
#                       "ALLOW"       — bypasses ALL restrictions (schedule, BLOCK, budget exhaustion).
#                       "FREE"        — bypasses ALL schedule and budget restrictions, preserves explicit BLOCK/ALLOW. Does not drain the budget.
#                       "LOG"         — acts identically to ALLOW (bypasses budget), but emits an explicit PARENTAL LOG.
#
#                     PRECEDENCE & DEFAULTS:
#                       Explicitly configured categories strictly take precedence over 
#                       the "total" fallback. For example, if "total" is "BLOCK" 
#                       but "educational" is "FREE", all allowance will be blocked 
#                       except educational sites.
#
#                       Evaluation Order: 
#                       1. WebUI Runtime Overrides (Gate Wide Open / Internet Cut)
#                       2. Explicit Category Action (LOG -> FREE -> ALLOW -> BLOCK)
#                       3. "total" Default Action (LOG -> FREE -> ALLOW -> BLOCK)
#                       4. WebUI Runtime Overrides (Suspension/Bypass - FREE / LOG)
#                       5. Schedule Window
#                       6. Category Time Budget
#                       7. "total" Time Budget

groups:

  # ── alice ─────────────────────────────────────────────────────────────────
  # Different time windows for school days vs weekends.
  alice:
    upstream:        "kids"
    schedule:
      - "mon-fri 07:00-21:00"
      - "sat-sun 09:00-22:00"
    budget_tracking: "group"
    budget:
      total:       "2h"
      bad_ip:      "BLOCK"
      games:       "1h"
      streaming:   "1h30m"
      social:      "BLOCK"
      educational: "FREE"

  # ── bob ───────────────────────────────────────────────────────────────────
  bob:
    upstream:        "kids"
    schedule:        "08:00-20:00"
    budget_tracking: "device"
    budget:
      total:     "3h"
      bad_ip:    "BLOCK"
      games:     "1h30m"
      streaming: "LOG" # Never block, but actively track streaming habits

  # ── charlie ───────────────────────────────────────────────────────────────
  # Example of using "total" as a default baseline action:
  # If you wanted to block EVERYTHING by default and only allow educational,
  # you would set `total: "BLOCK"` and `educational: "FREE"`.
  kids:
    upstream:        "kids"
    schedule:
      - "mon-fri 15:30-21:00"
      - "weekend  09:00-22:00"
    budget_tracking: "group"
    budget:
      total:  "3h"
      bad_ip: "BLOCK"
      games:  "1h"
      social: "30m"

  # ── bob ───────────────────────────────────────────────────────────────────
  # Log private-mac-address clients
  private:
    upstream: "secure"
    budget_tracking: "device"
    budget:
      total: "LOG"

# =============================================================================
# PARENTAL CONTROL
# =============================================================================
# Global settings for the parental control subsystem. Ignored when groups: is
# empty — zero overhead when parental control is off.

parental:

  # FastStart: when true, sdproxy will immediately start answering queries at boot
  # even if parental category lists have not finished downloading. This may allow
  # some unfiltered traffic through initially. When false, sdproxy postpones 
  # answering until lists are ready. Default: false.
  fast_start: false

  # TTL (seconds) sdproxy substitutes in responses for categorised domains.
  # Turns DNS into a periodic heartbeat on TTL-compliant clients. Default: 60.
  forced_ttl: 60

  # TTL (seconds) on blocked responses (0.0.0.0 for A, NXDOMAIN for others).
  # Can be overridden per group via groups.<n>.block_ttl. Default: 20.
  block_ttl: 20

  # How often (seconds) the background debit goroutine fires.
  # Minimum granularity of time accounting. Default: 10.
  ticker_interval: 10

  # How long after the last DNS query for a category before its timer pauses.
  # Makes time tracking accumulative. Can be overridden per category.
  # Default: "2m"
  default_idle_pause: "2m"

  # Deprecated alias for default_idle_pause — accepted for backward
  # compatibility. When both are present, default_idle_pause takes precedence.
  # default_session_window: "5m"

  # Directory where daily usage snapshots are written (one JSON file per
  # state key per day). Use persistent storage to survive reboots.
  # Default: /tmp/sdproxy
  snapshot_dir: "/var/lib/sdproxy"

  # ---------------------------------------------------------------------------
  # LIST PROCESSING / CONSOLIDATION
  # ---------------------------------------------------------------------------
  
  # Enable post-processing of loaded domain lists. When false, the options
  # below are skipped entirely. Default: true.
  # CAUTION: Please stick to the defaults for everything running smooth, if
  #          not, the bloom-filter my start categorizing/blocking less
  #          reliably.
  consolidation: true
  
  # Auto-synthesise missing parent domains when enough children share the
  # same category. Replaces the old negative-threshold hack. Default: false.
  synthesise_parents: false

  # Strip sub-domain entries whose parent is already in the same category list.
  # Reduces memory footprint. Default: true.
  remove_redundant_subdomains: true

  # Strip well-known service prefixes (www, cdn, api, etc.) from loaded
  # domain list entries. Default: false.
  strip_service_labels: false

  # Minimum number of direct children in the same category that must exist 
  # before the parent is synthesised (only applies if synthesise_parents is true).
  # Default: 10.
  parent_consolidation_threshold: 10

  # Minimum percentage of children that must agree on the winning category
  # before a parent domain is synthesised. Default: 90. Range: 1–100.
  consolidation_homogeneity_pct: 90

  # ---------------------------------------------------------------------------
  # CATEGORIES
  # ---------------------------------------------------------------------------
  # Domain categories for time budgeting. Only categories referenced in a
  # group budget are loaded — unused ones cost nothing.
  #
  # Fields:
  #   source:     — URL(s) or local file path(s) to load the domain list from.
  #                 Scalar (single) and sequence (multiple) forms both accepted.
  #                 http:// and https:// values are fetched over the network;
  #                 anything else is read from the local filesystem.
  #                 Fetched at startup; automatically refreshed weekly (Sun 03:00).
  #                 Local files are re-read from disk on every reload cycle.
  #                 Supported formats (auto-detected per line — files may mix):
  #                   DOMAIN  — one bare domain per line: example.com
  #                   HOSTS   — hosts file format: 0.0.0.0 host1.com host2.com
  #                   ADBLOCK — uBlock/AdBlock rules: ||example.com^
  #   idle_pause  — per-category override for default_idle_pause.
  #                 (replaces deprecated "session_window").
  #   add         — domains/patterns to include regardless of the source.
  #   remove      — domains/patterns to exclude even if in the source.
  #
  # ADD / REMOVE ENTRY TYPES
  #   Plain (no '*' or '?'):  apex domain — matches itself and all subdomains.
  #   Wildcard ('*' or '?'):  glob pattern — matched against the full queried
  #                           domain only (no suffix walk). Case-insensitive.

  categories:

    games:
      source:
        - "https://raw.githubusercontent.com/cbuijs/ut1/master/games/domains"
        - "https://raw.githubusercontent.com/cbuijs/ut1/master/gambling/domains"
      idle_pause: "2m"
      add:
        - "bet"
        - "bingo"
        - "crazygames.com"
        - "casino"
        - "epicgames.com"
        - "fortnite.com"
        - "fun"
        - "game"
        - "games"
        - "gg"
        - "itch.io"
        - "juegos"
        - "minecraft.net"
        - "ninja"
        - "play"
        - "poker"
        - "poki.com"
        - "roblox.com"
        - "toys"
        - "win"
        - "*game.*"
        - "*games.*"
      remove:
        - "about.com"
        - "chess.com"

    streaming:
      # Multiple sources combined into one category — sequence form.
      source:
        - "https://raw.githubusercontent.com/cbuijs/ut1/master/audio-video/domains"
        - "https://raw.githubusercontent.com/cbuijs/ut1/master/manga/domains"
        - "https://raw.githubusercontent.com/cbuijs/ut1/master/radio/domains"
      idle_pause: "5m"   # streaming apps buffer — use a wider idle window
      add:
        - "deezer.com"
        - "netflix.com"
        - "spotify.com"
        - "youtube.com"
        - "audio"
        - "cam"
        - "hbomax.com"
        - "disneyplus.com"
        - "live"
        - "media"
        - "now"
        - "netflix.com"
        - "primevideo.com"
        - "radio"
        - "show"
        - "skyshowtime.com"
        - "stream"
        - "tv"
        - "video"
        - "watch"

    social:
      source:
        - "https://raw.githubusercontent.com/cbuijs/ut1/master/social_networks/domains"
        - "https://raw.githubusercontent.com/hagezi/dns-blocklists/refs/heads/main/wildcard/social-onlydomains.txt"
      add:
        - "snapchat.com"
        - "tiktok.com"
        - "x.com"

    bad_ip:
      source:
        - "https://raw.githubusercontent.com/cbuijs/hagezi/refs/heads/main/lists/tif-ip/domains.ips"
      remove:
        - "127.0.0.0/8"
        - "10.0.0.0/8"
        - "172.16.0.0/12"
        - "192.168.0.0/16"
      

    # Local file example — useful for custom or offline lists.
    # Absolute paths are recommended; relative paths resolve from the working
    # directory of the sdproxy process (usually the config file directory).
    # The file may freely mix DOMAIN, HOSTS, and ADBLOCK format lines.
    custom_block:
      source: "/etc/sdproxy/custom-domains.txt"

    educational:
      # No source — manually curated only.
      add:
        - "khanacademy.org"
        - "duolingo.com"
        - "wolframalpha.com"
        - "wikipedia.org"

# =============================================================================
# OPERATIONAL WEB UI  (optional)
# =============================================================================
# Built-in single-page admin interface. Disabled by default — enable by
# setting enabled: true and a password. Provides runtime group override
# controls without requiring a config reload or restart.
#
# Access: http://<listen-address>
# Auth:   single-user password login; one active session at a time (8 h TTL).
# Note:   plain HTTP only — bind to loopback or protect with a firewall rule.
#         For remote access use an SSH tunnel rather than exposing the port.
#
# Group override modes (selectable per group on the web page):
#
#   DEFAULT  — normal operation; schedule and budget apply as configured.
#              Implicit state at startup and after a restart.
#
#   ALLOW    — gate wide open; all DNS queries pass regardless of schedule,
#              budget, or hard-block rules.
#
#   FREE     — suspend schedule and budget enforcement; queries are allowed
#              freely but the heartbeat TTL keeps client caches short-lived.
#              No budget is consumed. Explicit category configs are preserved.
#              Useful for guests, supervised homework.
#
#   BLOCK    — cut internet; every DNS query from the group returns a block
#              regardless of schedule or budget state.
#
#   LOG      — act identically to ALLOW (bypassing budget), but actively record 
#              the category/apex domain matched into the explicit PARENTAL LOG.
#
# Override state is in-memory only — resets to DEFAULT on restart.

webui:
  # Enable the admin web interface and its background tracker components completely.
  # Default: false.
  enabled: false

  # Plain HTTP listeners for the admin server.
  # Default: ["127.0.0.1:8080"] (loopback only). Set to ["0.0.0.0:8080"] 
  # plus a firewall rule to allow LAN-wide access.
  listen_http: ["127.0.0.1:8080"]

  # HTTPS listeners for the admin server.
  # Shares the server's global tls_cert and tls_key.
  # Note: If you configure a port here that is also used by DoH (e.g. 0.0.0.0:443),
  #       the Web UI is automatically multiplexed alongside DoH on that port.
  listen_https: []

  # Force HTTP to HTTPS redirection (301 Moved Permanently)
  force_https: false

  # Plain-text login password. Required to enable the web UI.
  password: "changeme"

  # Persistent API Token (Bearer Header or Query string: ?token=my-secret).
  # Use this to allow robust, automated /api/stats access (e.g. Prometheus)
  # without needing to emulate a browser cookie login sequence.
  api_token: ""

  # ---------------------------------------------------------------------------
  # WEB UI BRUTE-FORCE PROTECTION & ACCESS CONTROL
  # ---------------------------------------------------------------------------
  # Restrict Web UI access by IP or Subnet (CIDR).
  # Unauthorized IPs are instantly rejected with HTTP 403 Forbidden.
  acl:
    deny: []
    allow: [] # e.g. ["127.0.0.1", "192.168.1.0/24"]
    
  # Mitigate password guessing/brute-forcing from exposed interfaces.
  login_ratelimit:
    enabled: true
    max_attempts: 5
    lockout_minutes: 15

  # Show a statistics panel at the top of the main page.
  # Displays: uptime (with start date + time) · total queries · cache hits +
  #           hit rate · forwarded · blocked · cache fill.
  # Panel is polled live from /api/stats; no page reload needed.
  # Default: false — opt-in to avoid extra GET traffic on very low-end routers.
  stats_enabled: false

  # How often the stats panel refreshes, in seconds.
  # Values below 5 are ignored; the built-in default of 30 is used instead.
  # Default: 30.
  stats_refresh_sec: 30

  # Number of entries shown in each top-N list (Queried Domains, Blocked
  # Domains, Top Talkers, Top Categories).
  # Minimum: 5  |  Maximum: 100  |  Default: 10.
  # Lists with more than 10 entries become vertically scrollable
  # (max-height 300 px) so the page does not become unwieldy on large values.
  stats_top_n: 10

  # Show the 24-hour hourly activity graph section expanded by default.
  # The graph is always present when stats_enabled: true — this key only
  # controls whether the <details> element starts open or collapsed.
  # Collapsed by default to avoid visual weight until you want it.
  # Default: false.
  stats_graphs_enabled: false

  # Directory where web UI statistics and logs are persisted.
  # If left empty, persistence is completely disabled.
  history_dir: "/var/lib/sdproxy"

  # Number of hours of history to retain across reboots.
  # Applies to the hourly activity graph, all Top-N trackers, and the query log.
  # Default: 24.
  history_retention_hours: 24

  # Frequency to flush the historical stats and logs to disk.
  # Accepts Go duration strings ("5m", "1h"). Default: "5m".
  history_save_interval: "5m"