Re: [chrony-users] Seeing full FQDN in chronyc output

[Rob Janssen <chrony-users@xxxxxxxxx>]

    like many programs, chrony just does a reverse-lookup of the IP
    address, which
    results in a FQDN name (only) when a PTR record for the address is
    available in DNS.
    
    When you want to have that info you can use the chronyc -n sources
    command, and
    then parse the output to extract the IP addresses and do a reverse
    lookup on them,
    and get the result with the length that you want.
    
    I use this script to perform such lookups.  I saved it as
    /usr/local/bin/ip2host and then
    you can use: chronyc -n sources | ip2host
    
    Of course it destroys the layout of the output.
    
    Rob
    
    #!/usr/bin/perl -w
      
      my ($ip,$host);
      my @fields;
      
      while (<>) {
          chomp;
      
          @fields = split /(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/, $_;
      
          foreach $ip (@fields) {
              if ($ip =~
      m!^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$!) {
                  if (defined $cache{$ip}) {
                      $host = $cache{$ip};
                  } else
      {                                                            
                      $host =
      (gethostbyaddr(pack('C4',$1,$2,$3,$4),2))[0] || $ip;    
                      $cache{$ip} =
      $host;                                            
                 
      }                                                                 
       
                                                                              
       
                  if ($ip ne $host)
      {                                                 
                      $ip =
      $host.'['.$ip.']';                                        
                 
      }                                                                 
       
             
      }                                                                     
       
         
}                                                                         
       
                                                                              
       
          print
      @fields,"\n";                                                       
       
      }

On 2024-06-26 20:37, Mike Hall wrote:

Info in the /etc/chrony.conf file has IP addresses for the time servers.

"chronyc -n sources" seems to be providing the IP addresses only.

Should have mentioned in initial post that this version is the current

RHEL 8 version.  -- version 4.5 (+READLINE +SECHASH +IPV6 +DEBUG)

On Wed, Jun 26, 2024 at 2:33 PM Josef 'Jeff' Sipek <jeffpc@xxxxxxxxxxxxxx> wrote:

On Wed, Jun 26, 2024 at 14:29:07 -0400, Mike Hall wrote:
...
> Are there any other versions of the command that
> would provide a full FQDN, and preferably all FQDN names.

Does 'chronyc -n sources' do what you want?  See the manpage for a full
description.

Jeff.

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