Sorry to bother you with such a trivial (probably) question, but my C++
is not really good, and I need some help to get along with this project.
My goal is to take one of the values from suboption #2 in an Option 82
and insert it into a suboption in Option 43 in the DHCP-reply.
So I receive a DHCP-reuqest with Option82-2 set to something like
"customer-number-cpe-id" (IE "104523-01") and I need to add that string
to the outgoing reply.
- That way, the CPE will be instructed to download its customzed config
file on boot.
So far, I have managed to modify the example-hook, so I can actually
read the Option 82 and 43-values with the following code added to the
pkt4_send.cc:
OptionPtr option82_ptr = response4_ptr->getOption(82);
OptionPtr option82_1_ptr = option82_ptr->getOption(1);
OptionPtr option82_2_ptr = option82_ptr->getOption(2);
OptionPtr option43_ptr = response4_ptr->getOption(43);
OptionPtr option43_1_ptr = option43_ptr->getOption(1);
And I can log the raw options to the "interesting" file by
string option82_1_data = option82_1_ptr->toString();
string option82_2_data = option82_2_ptr->toString();
string option43_1_data = option43_1_ptr->toString();
// Write the information to the log file.
interesting << hwaddr << " " << ipaddr << " " <<
option82_1_data << " " << option82_2_data << " " << option43_1_data << "\n";
However, I just can't figure out how to get the actual value of the
options, not the complete binary data, including length and type.
So the string in the log looks like:
type=001, len=017: 41:43:58:2d:30:32:3a:67:65:2d:30:2f:30:2f:34:2e:30
I could ofcourse strip the first 19 bytes from the string, and then do a
manual character-conversion of each of the numeric values, but I guess
(hope?) there is an easier way to get the textual value of an option.
I have tried to understand how getValue() and the other functions should
be applied, but so far I have had no luck.
So if someone could point me in the right direction, I will hopefully be
able to get this hook working.
Rgds.
Ola Thoresen
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