[Bug 1818] New: Rsyncd refuses connection if reverse mapping fails

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=1818

           Summary: Rsyncd refuses connection if reverse mapping fails
           Product: rsync
           Version: 2.5.7
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: heikki at indexdata.dk
         QAContact: rsync-qa at samba.org


First of all, apologies for running a prehistoric version  (2.5.6cvs), but that's what my 
Debian/Stable has (and it has its own patches too...). I tried to scan the bug reports to see if 
this had been fixed in a later version, but didn't find anything.  
 
Anyway, the problem is that I need to rsync from a machine that has no reverse mapping. I 
would expect it to be sufficient to specify the IP address in the hosts allow line, but no, the 
connection is rejected with  
(client side:) 
  opening tcp connection to bagel.indexdata.dk port 873 
  @ERROR: access denied to fng from unknown (212.XXX.XXX.201) 
(server syslog) 
  Sep 24 12:18:48 bagel rsyncd[5845]: rsync: name lookup failed for 212.XXX.XXX.201: Name 
or service not known 
  Sep 24 12:18:48 bagel rsyncd[5845]: rsync denied on module fng from unknown 
(212.130.49.201) 
 
I can work around this by adding  
  hosts allow unknown 
but that is not exactly what I want to do! Luckily I can get away with this by filtering at the 
firewall, but that isn't exactly proper. 
 
A random observation: When it works, the syslog says: 
  rsync to fng/fngindex/ from fngindexdata at unknown (212.XXX.XXX.201) 
Maybe that tells you something about the host name being needed somewhere else in the 
auth process...

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