[JDEV] question on dialback.c

[Frank Koenen]

hello.

can anyone give me insight on the following lines of code in the function dialback_out_read() in dialback.c:

        /* make sure we're not connecting to ourselves */
        if( ghash_get( c->d->in_id, xmlnode_get_attrib( x , "id" ) ) != NULL)
        {
            log_alert(c->key->server,"hostname maps back to ourselves!");
            mio_write(m, NULL, "<stream:error>Mirror Mirror on the wall</stream:error>", -1);
            mio_close(m);
            break;
        }


i've run into a problem using multiple jabber servers on a single server, listening on virtual network interfaces.

when i try to add roster items of users from one server to the next, i get the "hostname maps back to ourselves!"
error. When I enable -D debug mode on the servers to snoop on them... the problem doesn't happen.

I have two servers, one running on 10.10.12.10 and one running on 10.10.12.11, using a test environment and a locally
configured DNS server to test. The hostnames and reverse lookups are correct.

When I comment out the lines of code above from the dialback.c, everything works okay.

Any reason why the 'ghash_get( c->d->in_id, xmlnode_get_attrib( x , "id" ) ) != NULL' statement causes a false truth?
Is it safe to comment this block of logic altogether?

Thanks.

-- 
Frank Koenen
Dir. of Technical Services
Monet Technologies Inc.
Email: fkoenen at vonworld.com


Details on the problem follow:

-----------------------------------------------------------------------------------
  some output from an 'nslookup' on the local server:

   > jabberdebug.koenen.com
   Server:         192.10.100.97
   Address:        192.10.100.97#53
   Name:   jabberdebug.koenen.com
   Address: 10.10.12.11
   
   > 10.10.12.11
   Server:         192.10.100.97
   Address:        192.10.100.97#53
   11.12.10.10.in-addr.arpa        name = jabberdebug.koenen.com.

   > jabberdebug2.koenen.com
   Server:         192.10.100.97
   Address:        192.10.100.97#53
   Name:   jabberdebug2.koenen.com
   Address: 10.10.12.10
   
   > 10.10.12.10
   Server:         192.10.100.97
   Address:        192.10.100.97#53
   10.12.10.10.in-addr.arpa        name = jabberdebug2.koenen.com.
   

------------------------------------------------------------------------------------------

I send:  <presence type='subscribe' to='fkoenen at jabberdebug.koenen.com'/> from my login on the server jabberdebug2.koenen.com(10.10.12.10)
when I get the error: 'hostname maps back to ourselves'.

------------------------------------------------------------------------------------------

here's a snippet from my jabber.xml file:

 <service id="s2s">
    <load>
      <dialback>./dialback/dialback.so</dialback>
    </load>
    <dialback xmlns='jabber:config:dialback'>
      <legacy/>
      <!-- Use these to listen on particular addresses and/or ports.
      <ip port="7000"/>
      <ip port="5269">127.0.0.1</ip>
      -->
      <ip port="5269">10.10.12.10</ip>
      <karma>
        <init>50</init>
        <max>50</max>
        <inc>4</inc>
        <dec>1</dec>
        <penalty>-5</penalty>
        <restore>50</restore>
      </karma>
    </dialback>
  </service>


the same entry is in the other server jabber.xml file too, except the "10.10.12.10" is changed to "10.10.12.11"