Favicon hash probing

[ehsandeep]

Discussed in #458

Please describe your feature request:

chaos -d hackerone.com | ./httpx -favicon -sc

https://api.hackerone.com [1444372553] [200]
https://docs.hackerone.com [1807456141] [200]
https://gslink.hackerone.com [1506877856] [200]
https://mta-sts.hackerone.com [-1700323260] [404]
https://mta-sts.forwarding.hackerone.com [-1700323260] [404]
https://mta-sts.managed.hackerone.com [-1700323260] [404]
https://resources.hackerone.com [-2123925267] [404]
https://support.hackerone.com [-940825619] [404]
https://www.hackerone.com [1052551739] [200]

chaos -d hackerone.com | ./httpx -match-favicon 1444372553

https://api.hackerone.com [1444372553]

chaos -d hackerone.com | ./httpx -filter-favicon '-1700323260' -mc 200

https://api.hackerone.com [1444372553]
https://docs.hackerone.com [1807456141]
https://gslink.hackerone.com [1506877856]
https://www.hackerone.com [1052551739]

{
  "timestamp": "2022-01-03T13:57:33.790084+05:30",
  "scheme": "https",
  "port": "443",
  "path": "/favicon.ico",
  "body-sha256": "ba712982ab0d40a72abb893646db62ade35983fc4bdb83abb9a7ebdcd75f569d",
  "header-sha256": "01b9afd2df1e0ad9fb662b1c4a8ee4216772621c1d472a1e5e4b5364c37c801d",
  "favicon-mmh3": "1052551739",
  "a": [
    "104.16.100.52",
    "104.16.99.52"
  ],
  "url": "https://hackerone.com:443/favicon.ico",
  "input": "hackerone.com",
  "webserver": "cloudflare",
  "content-type": "image/vnd.microsoft.icon",
  "method": "GET",
  "host": "104.16.100.52",
  "content-length": 5426,
  "status-code": 200,
  "csp": {
    "domains": [
      "www.google-analytics.com",
      "errors.hackerone.net",
      "cover-photos.hackerone-user-content.com",
      "hackathon-photos.hackerone-user-content.com",
      "profile-photos.hackerone-user-content.com",
      "hackerone-us-west-2-production-attachments.s3.us-west-2.amazonaws.com",
      "https://errors.hackerone.net/api/30/csp-report/?sentry_key=374aea95847f4040a69f9c8d49a3a59d",
      "www.youtube-nocookie.com"
    ]
  },
  "response-time": "2.2161905s",
  "failed": false
}

Flags:

   -favicon     Display Favicon hash
   -mfc, -match-favicon    Match Favicon hash
   -ffc, -filter-favicon    Filter Favicon hash

[ehsandeep]

Hash can be calculated using mmh3 algorithm against /favicon.ico response body.