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Today's Topics:
1. hook library question: parsing DHO_DHCP_AGENT_OPTIONS sub
options in incoming packets (Angelo Failla)
2. Re: [Potential Spoof] hook library question: parsing
DHO_DHCP_AGENT_OPTIONS sub options in incoming packets (Angelo Failla)
----------------------------------------------------------------------
Message: 1
Date: Thu, 3 Nov 2016 11:34:05 +0000
From: Angelo Failla <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [kea-dev] hook library question: parsing
DHO_DHCP_AGENT_OPTIONS sub options in incoming packets
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
Hi,
I have a question about retrieving DHO_DHCP_AGENT_OPTIONS from an incoming
dhcpv4 DISCOVER packet.
I have this code in my hook library:
OptionPtr rai = query4_ptr->getOption(DHO_DHCP_AGENT_OPTIONS);
OptionPtr circuit_id_opt = rai->getOption(RAI_OPTION_AGENT_CIRCUIT_ID);
OptionPtr remote_id_opt = rai->getOption(RAI_OPTION_REMOTE_ID);
But both circuit_id_opt and remote_id_opt are empty.
What am I doing wrong?
Option 82 contains 2 suboptions in my case.
I am writing unit tests for my own hook library:
On the client side:
// Create a sample DHCPv4 option 82 with suboptions. Shamelessly copied from
// KEA test suit.
static OptionBuffer createAgentInformationOption() {
const uint8_t opt_data[] = {
0x52, 0x28, // Agent Information Option (length = 40)
// Suboptions start here...
0x01, 0x11, // Agent Circuit ID (length = 17)
// "Ethernet10:2026"
0x00, 0x0f, 0x45, 0x74, 0x68, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x31, 0x30,
0x3a, 0x32, 0x30, 0x32, 0x36,
0x02, 0x13, // Agent Remote ID (length = 19)
// "00:1c:73:8c:d0:e5"
0x00, 0x11, 0x30, 0x30, 0x3a, 0x31, 0x63, 0x3a, 0x37, 0x33, 0x3a, 0x38,
0x63, 0x3a, 0x64, 0x30, 0x3a, 0x65, 0x35
};
// total length = 42
return (OptionBuffer(opt_data, opt_data + sizeof(opt_data)));
}
// add options 82 (both suboptions) to the request.
OptionBuffer agent_info_buf = createAgentInformationOption();
auto agent_info = boost::make_shared<Option>(
Option::V4, DHO_DHCP_AGENT_OPTIONS, agent_info_buf);
query->addOption(agent_info);
On the server side I am trying to get them but as I wrote before it?s not
working.
I can write my own code to parse the buffer but before doing that I wanted to
ask here ?
Regards
--
Angelo Failla
Cluster Infrastructure - Dublin
[email protected]
------------------------------
Message: 2
Date: Thu, 3 Nov 2016 11:38:09 +0000
From: Angelo Failla <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [kea-dev] [Potential Spoof] hook library question:
parsing DHO_DHCP_AGENT_OPTIONS sub options in incoming packets
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
I forgot to mention that for various reasons we are still on 0.9.2 (so I am not
sure if this works on 1.0)
--
Angelo Failla
Cluster Infrastructure - Dublin
[email protected]
On 11/3/16, 11:34 AM, "kea-dev on behalf of Angelo Failla"
<[email protected] on behalf of [email protected]> wrote:
Hi,
I have a question about retrieving DHO_DHCP_AGENT_OPTIONS from an incoming
dhcpv4 DISCOVER packet.
I have this code in my hook library:
OptionPtr rai = query4_ptr->getOption(DHO_DHCP_AGENT_OPTIONS);
OptionPtr circuit_id_opt = rai->getOption(RAI_OPTION_AGENT_CIRCUIT_ID);
OptionPtr remote_id_opt = rai->getOption(RAI_OPTION_REMOTE_ID);
But both circuit_id_opt and remote_id_opt are empty.
What am I doing wrong?
Option 82 contains 2 suboptions in my case.
I am writing unit tests for my own hook library:
On the client side:
// Create a sample DHCPv4 option 82 with suboptions. Shamelessly copied from
// KEA test suit.
static OptionBuffer createAgentInformationOption() {
const uint8_t opt_data[] = {
0x52, 0x28, // Agent Information Option (length = 40)
// Suboptions start here...
0x01, 0x11, // Agent Circuit ID (length = 17)
// "Ethernet10:2026"
0x00, 0x0f, 0x45, 0x74, 0x68, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x31,
0x30,
0x3a, 0x32, 0x30, 0x32, 0x36,
0x02, 0x13, // Agent Remote ID (length = 19)
// "00:1c:73:8c:d0:e5"
0x00, 0x11, 0x30, 0x30, 0x3a, 0x31, 0x63, 0x3a, 0x37, 0x33, 0x3a,
0x38,
0x63, 0x3a, 0x64, 0x30, 0x3a, 0x65, 0x35
};
// total length = 42
return (OptionBuffer(opt_data, opt_data + sizeof(opt_data)));
}
// add options 82 (both suboptions) to the request.
OptionBuffer agent_info_buf = createAgentInformationOption();
auto agent_info = boost::make_shared<Option>(
Option::V4, DHO_DHCP_AGENT_OPTIONS, agent_info_buf);
query->addOption(agent_info);
On the server side I am trying to get them but as I wrote before it?s not
working.
I can write my own code to parse the buffer but before doing that I wanted
to ask here ?
Regards
--
Angelo Failla
Cluster Infrastructure - Dublin
[email protected]
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