[AGENT++] IpAddress: how to create a Hex-String instead a String?

[Jochen Katz]

Hello,

> I have a simple table with an agent++::IpAddress, but when I read this  
> OID, the result is NOT encoded as I expected
> 
> This is how I fill this value:
> 
>             IpAddress _ipAddr("::1");
>              row->get_nth(nNetSnmpHostAddress)- 
>  >replace_value(OctetStr(_ipAddr).clone());
> 
> NET-SNMP-EXAMPLES-MIB::netSnmpHostAddress."loopback" = STRING:  
> "0000:0000:0000:0000:0000:0000:0000:0001"
> SNMP-TARGET-MIB::snmpTargetAddrTAddress.'internal0' = Hex-STRING: 00  
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 A2 00
> 
> 
> As you can see, the TargetAddressTable is more compact for this simple  
> ipv6 localhost address!
> 
> Too, IpAddress::get_printable() should get the string as "::1" in this  
> case.
> Is it possible to control this?

not at the moment. Both, "operator const char*" and get_printable use
the IpAddress::format_output() function, that always generates the full
string. There is currently no code to detect blocks of zeroes or ipv4
mapped addresses.

The hex string could be created like this:
	OctetStr hex;
	hex.set_len(ip.get_length());
	for (int i=0; i < ip.get_length(); i++)
		hex[i] = ip[i];

Regards,
  Jochen