🚀
DNSControl
🚀
DNSControl
  • Introduction to DNSControl
  • Getting Started
    • Overview
    • Examples
    • Migrating zones to DNSControl
    • TypeScript autocomplete and type checking
  • Language Reference
    • JavaScript DSL
    • Top Level Functions
      • D
      • DEFAULTS
      • DOMAIN_ELSEWHERE
      • DOMAIN_ELSEWHERE_AUTO
      • D_EXTEND
      • FETCH
      • HASH
      • IP
      • NewDnsProvider
      • NewRegistrar
      • PANIC
      • REV
      • REVCOMPAT
      • getConfiguredDomains
      • require
      • require_glob
    • Domain Modifiers
      • A
      • AAAA
      • ALIAS
      • AUTODNSSEC_OFF
      • AUTODNSSEC_ON
      • CAA
      • CAA_BUILDER
      • CNAME
      • DHCID
      • DNAME
      • DNSKEY
      • DISABLE_IGNORE_SAFETY_CHECK
      • DMARC_BUILDER
      • DS
      • DefaultTTL
      • DnsProvider
      • FRAME
      • HTTPS
      • IGNORE
      • IGNORE_NAME
      • IGNORE_TARGET
      • IMPORT_TRANSFORM
      • IMPORT_TRANSFORM_STRIP
      • INCLUDE
      • LOC
      • LOC_BUILDER_DD
      • LOC_BUILDER_DMM_STR
      • LOC_BUILDER_DMS_STR
      • LOC_BUILDER_STR
      • M365_BUILDER
      • MX
      • NAMESERVER
      • NAMESERVER_TTL
      • NAPTR
      • NO_PURGE
      • NS
      • PTR
      • PURGE
      • SOA
      • SPF_BUILDER
      • SRV
      • SSHFP
      • SVCB
      • TLSA
      • TXT
      • URL
      • URL301
      • Service Provider specific
        • Akamai Edge Dns
          • AKAMAICDN
        • Amazon Route 53
          • R53_ALIAS
        • Azure DNS
          • AZURE_ALIAS
        • Cloudflare DNS
          • CF_REDIRECT
          • CF_SINGLE_REDIRECT
          • CF_TEMP_REDIRECT
          • CF_WORKER_ROUTE
        • ClouDNS
          • CLOUDNS_WR
    • Record Modifiers
      • TTL
      • Service Provider specific
        • Amazon Route 53
          • R53_ZONE
          • R53_EVALUATE_TARGET_HEALTH
    • Why CNAME/MX/NS targets require a "dot"
  • Provider
    • Supported providers
    • Akamai Edge DNS
    • Amazon Route 53
    • AutoDNS
    • AXFR+DDNS
    • Azure DNS
    • Azure Private DNS
    • BIND
    • Bunny DNS
    • CentralNic Reseller (CNR) - formerly RRPProxy
    • Cloudflare
    • ClouDNS
    • CSC Global
    • deSEC
    • DigitalOcean
    • DNS Made Easy
    • DNSimple
    • DNS-over-HTTPS
    • DOMAINNAMESHOP
    • Dynadot
    • easyname
    • Exoscale
    • Gandi_v5
    • Gcore
    • Google Cloud DNS
    • Hetzner DNS Console
    • HEXONET
    • hosting.de
    • Huawei Cloud DNS
    • Hurricane Electric DNS
    • Internet.bs
    • INWX
    • Linode
    • Loopia
    • LuaDNS
    • Microsoft DNS Server on Microsoft Windows Server
    • Mythic Beasts
    • Namecheap
    • Name.com
    • Netcup
    • Netlify
    • NS1
    • OpenSRS
    • Oracle Cloud
    • OVH
    • Packetframe
    • Porkbun
    • PowerDNS
    • Realtime Register
    • RWTH DNS-Admin
    • Sakura Cloud
    • SoftLayer DNS
    • TransIP
    • Vultr
  • Commands
    • preview/push
    • check-creds
    • get-zones
    • get-certs
    • fmt
    • creds.json
    • Global Flag
    • Disabling Colors
  • Advanced features
    • CI/CD example for GitLab
    • CLI variables
    • Nameservers and Delegations
    • Notifications
    • Useful code tricks
    • JSON Reports
  • Developer info
    • Code Style Guide
    • Documentation Style Guide
    • DNSControl is an opinionated system
    • Writing new DNS providers
    • Creating new DNS Resource Types (rtypes)
    • Integration Tests
    • Test a branch
    • Unit Testing DNS Data
    • Bug Triage Process
    • Bring-Your-Own-Secrets for automated testing
    • Debugging with dlv
    • ALIAS Records
    • TXT record testing
    • DNS records ordering
  • Release
    • How to build and ship a release
    • Changelog v3.16.0
    • GitHub releases
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  1. Language Reference
  2. Top Level Functions

FETCH

PreviousD_EXTENDNextHASH

Last updated 5 months ago

FETCH is a wrapper for the . This allows dynamically setting DNS records based on an external data source, e.g. the API of your cloud provider.

Compared to fetch from Fetch API, FETCH will call to terminate the execution of the script, and therefore DNSControl, if a network error occurs.

Otherwise the syntax of FETCH is the same as fetch.

FETCH is not enabled by default. Please read the warnings below.

WARNING:

  1. Relying on external sources adds a point of failure. If the external source doesn't work, your script won't either. Please make sure you are aware of the consequences.

  2. Make sure DNSControl only uses verified configuration if you want to use FETCH. For example, an attacker can send Pull Requests to your config repo, and have your CI test malicious configurations and make arbitrary HTTP requests. Therefore, FETCH must be explicitly enabled with flag --allow-fetch on DNSControl invocation.

dnsconfig.js
D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
  A("@", "1.2.3.4"),
);

FETCH("https://example.com", {
  // All three options below are optional
  headers: {"X-Authentication": "barfoo"},
  method: "POST",
  body: "Hello World",
}).then(function(r) {
  return r.text();
}).then(function(t) {
  // Example of generating record based on response
  D_EXTEND("example.com", [
    TXT("@", t.slice(0, 100)),
  ]);
});
Fetch API
PANIC