[Bug 1921636] Re: resolved CNAME redirect issues

[Dan Streetman]

Quite a number of CNAME redirects you have there!

The resolved logs appear to be fine, e.g.:
Mar 28 11:30:27 castle systemd-resolved[73519]: Added positive unauthenticated cache entry for standard.t-0009.t-msedge.net IN A 30s on enp4s0f0/INET/10.18.1.1
Mar 28 11:30:27 castle systemd-resolved[73519]: Added positive unauthenticated cache entry for standard.t-0009.t-msedge.net IN A 30s on enp4s0f0/INET/10.18.1.1

And when I try to resolve your example hostname it only goes through 2 CNAMES:
$ host static-exp1.licdn.com
static-exp1.licdn.com is an alias for 2-01-2c3e-003d.cdx.cedexis.net.
2-01-2c3e-003d.cdx.cedexis.net is an alias for cs1404.wpc.epsiloncdn.net.
cs1404.wpc.epsiloncdn.net has address 152.199.24.163
cs1404.wpc.epsiloncdn.net has IPv6 address 2606:2800:21f:fedd:8b7a:88ab:fc7e:fa3b


Do you have a different example hostname that I can try to reproduce this with?

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

** Changed in: systemd (Ubuntu Groovy)
       Status: New => Incomplete

** Bug watch added: github.com/systemd/systemd/issues #18819
   https://github.com/systemd/systemd/issues/18819

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/18819
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1921636

Title:
  resolved CNAME redirect issues

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Incomplete
Status in systemd source package in Groovy:
  Incomplete

Bug description:
  I am having issues loading certain websites such as linkedin.com and
  portions of google sites including images.google.com, hotmail.com
  login, etc. After looking through some logs and such I've determined
  that resolved is not properly following CNAMEs to an IP address.
  Querying the DNS server on my network directly for the info works
  fine. Loading the sites from other computers on the network works
  fine.

  In the #systemd IRC channel I was directed to the following two issues:
  https://github.com/systemd/systemd/pull/18892
  https://github.com/systemd/systemd/pull/19009

  System info:
  Ubuntu 20.10
  ii  systemd        246.6-1ubuntu1.2 amd64        system and service manager
  ii  linux-generic  5.8.0.48.53  amd64        Complete Generic Linux kernel and headers

  Example:
  [11:06:00]<root at castle:/var/log> host static-exp1.licdn.com
  Host static-exp1.licdn.com not found: 2(SERVFAIL)
  [11:06:17]<root at castle:/var/log> resolvectl status
  Global
         LLMNR setting: no               
  MulticastDNS setting: no               
    DNSOverTLS setting: no               
        DNSSEC setting: no               
      DNSSEC supported: no               
            DNS Domain: rhos.bigfiber.net
                        bigfiber.net     

  Link 2 (enp6s0)
        Current Scopes: none
  DefaultRoute setting: no  
         LLMNR setting: yes 
  MulticastDNS setting: no  
    DNSOverTLS setting: no  
        DNSSEC setting: no  
      DNSSEC supported: no  

  Link 3 (enp4s0f0)
        Current Scopes: DNS              
  DefaultRoute setting: yes              
         LLMNR setting: yes              
  MulticastDNS setting: no               
    DNSOverTLS setting: no               
        DNSSEC setting: no               
      DNSSEC supported: no               
    Current DNS Server: 10.18.1.1        
           DNS Servers: 10.18.1.1        
            DNS Domain: ~.               
                        rhos.bigfiber.net
                        bigfiber.net     

  Link 4 (enp4s0f1)
        Current Scopes: none
  DefaultRoute setting: no  
         LLMNR setting: yes 
  MulticastDNS setting: no  
    DNSOverTLS setting: no  
        DNSSEC setting: no  
      DNSSEC supported: no  
  [11:06:26]<root at castle:/var/log> host static-exp1.licdn.com 10.18.1.1
  Using domain server:
  Name: 10.18.1.1
  Address: 10.18.1.1#53
  Aliases: 

  static-exp1.licdn.com is an alias for 2-01-2c3e-003d.cdx.cedexis.net.
  2-01-2c3e-003d.cdx.cedexis.net is an alias for li-prod-static.azureedge.net.
  li-prod-static.azureedge.net is an alias for li-prod-static.afd.azureedge.net.
  li-prod-static.afd.azureedge.net is an alias for star-azureedge-prod.trafficmanager.net.
  star-azureedge-prod.trafficmanager.net is an alias for dual.t-0009.t-msedge.net.
  dual.t-0009.t-msedge.net is an alias for t-0009.t-msedge.net.
  t-0009.t-msedge.net is an alias for Edge-Prod-WSTr3.ctrl.t-0009.t-msedge.net.
  Edge-Prod-WSTr3.ctrl.t-0009.t-msedge.net is an alias for edge-prod-wstr3.ctrl.t-0001.trafficmanager.net.
  edge-prod-wstr3.ctrl.t-0001.trafficmanager.net is an alias for standard.t-0009.t-msedge.net.
  standard.t-0009.t-msedge.net has address 13.107.213.19
  standard.t-0009.t-msedge.net has address 13.107.246.19
  standard.t-0009.t-msedge.net has IPv6 address 2620:1ec:46::19
  standard.t-0009.t-msedge.net has IPv6 address 2620:1ec:bdf::19

  
  resolved debugging log is attached.

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