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Blake Ridgway b3b02c7db4 Initial commit
2026-03-21 17:59:35 -05:00

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arcline-check — CDN / Transparency Auditor

Checks whether a domain is truly self-hosted or routing through a CDN/cloud provider (Cloudflare, Fastly, AWS CloudFront, etc.). Core to the Arcline brand.

Stack

  • Language: Go
  • Distribution: single static binary (linux/amd64, darwin/arm64, windows/amd64)
  • No runtime dependencies

Features

  • Resolve domain → IP
  • Reverse DNS lookup (PTR record)
  • ASN / org lookup via ip-api.com or ipinfo.io (self-hosted fallback)
  • Detect known CDN/cloud CIDR ranges (Cloudflare, Fastly, AWS, GCP, Azure)
  • HTTP header inspection (CF-Ray, X-Served-By, Via, Server, X-Cache)
  • Output: clean terminal report (color-coded pass/fail)
  • Output: --json flag for scripting
  • --watch flag: re-check every N seconds (useful during DNS migration)

CLI interface

arcline-check example.com
arcline-check example.com --json
arcline-check example.com --watch 30

Output format

$ arcline-check example.com

  domain      example.com
  resolved    203.0.113.42
  rdns        server1.arclineit.com
  asn         AS64496  Example ISP
  org         Example ISP LLC

  [OK]  not behind a known CDN
  [OK]  no Cloudflare headers detected
  [OK]  IP not in AWS/GCP/Azure ranges

Tasks

  • Project scaffold (go mod init, cmd/, internal/)
  • DNS resolution + PTR lookup
  • ASN lookup (HTTP call to free API, cache result)
  • CDN CIDR list (embed JSON, update via Makefile)
  • HTTP header fetch + CDN header detection
  • Report renderer (color terminal + JSON)
  • --watch mode
  • Cross-compile Makefile targets
  • README with usage examples
  • GitLab CI: build + release binaries on tag