[Kea-users] Parsing Option 82

[Gokulakrishnan Gopalakrishnan]

I'm trying to print and parse Option 82 but I couldn't understand the format in which it is received. My 'option->toText()' print this

type=082, len=024:,
options:
  type=001, len=014: 01:0c:45:74:68:65:72:6e:65:74:31:2f:32:39
  type=002, len=006: 04:62:73:56:13:bc

Can someone help me to understand this value?

Thanks,

Gokul

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[Christian Kratzer]

Hi,

On Tue, 4 Jul 2017, Gokulakrishnan Gopalakrishnan wrote:
> I'm trying to print and parse Option 82 but I couldn't understand the
> format in which it is received. My 'option->toText()' print this
> type=082, len=024:,
> options:
>  type=001, len=014: 01:0c:45:74:68:65:72:6e:65:74:31:2f:32:39
>  type=002, len=006: 04:62:73:56:13:bc
>
> Can someone help me to understand this value?

Option82 has suboptions as defined in: https://tools.ietf.org/rfc/rfc3046.txt

Suboption 1 is circuit-id.

Suboption 2 is remote-id.

So you seem to have a circuit-id of: 01:0c:45:74:68:65:72:6e:65:74:31:2f:32:39 and a remote-id of: 04:62:73:56:13:bc.

Also they seem to be binary.

They could also be in ascii.

Depends on the relay agent inserting the options.

Greetings
Christian

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[Itay Rozenberg]

 

Greetings

 

 

Type 001 – circuit_id - hex, you need to convert it to ascii. (try it on this web site: http://www.rapidtables.com/convert/number/hex-to-ascii.htm )

Type 002 – remote_id - Mac address

Each of them can be hex or mac address.

 

Try this:

std::string hexToAscii(std::string c) {

        int length = c.length();

        std::string newString;

        for (int i = 0; i < length; i+=2) {

                std::string byte = c.substr(i, 2);

                char chr = (char)(int)strtol(byte.c_str(), NULL, 16);

                newString.push_back(chr);

        }

        return newString;

}

 

 

 

OptionPtr rai = query4_ptr->getOption(DHO_DHCP_AGENT_OPTIONS);

        if (rai) {

                OptionPtr circuit_id_opt = rai->getOption(RAI_OPTION_AGENT_CIRCUIT_ID);

                if (circuit_id_opt) {

                        string cid = hexToAscii(circuit_id_opt->toHexString().substr(2));

                }

        }

 

For the other one (remote_id) use getOption(RAI_OPTION_AGENT_CIRCUIT_ID).

 

itay

 

From: Kea-users [[hidden email]] On Behalf Of Gokulakrishnan Gopalakrishnan
Sent: Tuesday, July 4, 2017 2:20 PM
To: [hidden email]
Subject: [Kea-users] Parsing Option 82

 

I'm trying to print and parse Option 82 but I couldn't understand the format in which it is received. My 'option->toText()' print this

type=082, len=024:,
options:
  type=001, len=014: 01:0c:45:74:68:65:72:6e:65:74:31:2f:32:39
  type=002, len=006: 04:62:73:56:13:bc

 

Can someone help me to understand this value?

 

Thanks,

Gokul

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[Itay Rozenberg]

For the other one (remote_id) use getOption(RAI_OPTION_AGENT_REMOTE_ID).

 

 

From: Kea-users [mailto:[hidden email]] On Behalf Of Itay Rozenberg
Sent: Tuesday, July 4, 2017 5:23 PM
To: 'Gokulakrishnan Gopalakrishnan'
Cc: '[hidden email]'
Subject: Re: [Kea-users] Parsing Option 82

 

 

Greetings

 

 

Type 001 – circuit_id - hex, you need to convert it to ascii. (try it on this web site: http://www.rapidtables.com/convert/number/hex-to-ascii.htm )

Type 002 – remote_id - Mac address

Each of them can be hex or mac address.

 

Try this:

std::string hexToAscii(std::string c) {

        int length = c.length();

        std::string newString;

        for (int i = 0; i < length; i+=2) {

                std::string byte = c.substr(i, 2);

                char chr = (char)(int)strtol(byte.c_str(), NULL, 16);

                newString.push_back(chr);

        }

        return newString;

}

 

 

 

OptionPtr rai = query4_ptr->getOption(DHO_DHCP_AGENT_OPTIONS);

        if (rai) {

                OptionPtr circuit_id_opt = rai->getOption(RAI_OPTION_AGENT_CIRCUIT_ID);

                if (circuit_id_opt) {

                        string cid = hexToAscii(circuit_id_opt->toHexString().substr(2));

                }

        }

 

For the other one (remote_id) use getOption(RAI_OPTION_AGENT_CIRCUIT_ID).

 

itay

 

From: Kea-users [[hidden email]] On Behalf Of Gokulakrishnan Gopalakrishnan
Sent: Tuesday, July 4, 2017 2:20 PM
To: [hidden email]
Subject: [Kea-users] Parsing Option 82

 

I'm trying to print and parse Option 82 but I couldn't understand the format in which it is received. My 'option->toText()' print this

type=082, len=024:,
options:
  type=001, len=014: 01:0c:45:74:68:65:72:6e:65:74:31:2f:32:39
  type=002, len=006: 04:62:73:56:13:bc

 

Can someone help me to understand this value?

 

Thanks,

Gokul

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[Gokulakrishnan Gopalakrishnan]

Thanks Christian, Itay. It helps!

On Tue, Jul 4, 2017 at 8:21 PM, Itay Rozenberg <[hidden email]> wrote:

For the other one (remote_id) use getOption(RAI_OPTION_AGENT_REMOTE_ID).

 

 

From: Kea-users [mailto:[hidden email]] On Behalf Of Itay Rozenberg
Sent: Tuesday, July 4, 2017 5:23 PM
To: 'Gokulakrishnan Gopalakrishnan'
Cc: '[hidden email]'
Subject: Re: [Kea-users] Parsing Option 82

 

 

Greetings

 

 

Type 001 – circuit_id - hex, you need to convert it to ascii. (try it on this web site: http://www.rapidtables.com/convert/number/hex-to-ascii.htm )

Type 002 – remote_id - Mac address

Each of them can be hex or mac address.

 

Try this:

std::string hexToAscii(std::string c) {

        int length = c.length();

        std::string newString;

        for (int i = 0; i < length; i+=2) {

                std::string byte = c.substr(i, 2);

                char chr = (char)(int)strtol(byte.c_str(), NULL, 16);

                newString.push_back(chr);

        }

        return newString;

}

 

 

 

OptionPtr rai = query4_ptr->getOption(DHO_DHCP_AGENT_OPTIONS);

        if (rai) {

                OptionPtr circuit_id_opt = rai->getOption(RAI_OPTION_AGENT_CIRCUIT_ID);

                if (circuit_id_opt) {

                        string cid = hexToAscii(circuit_id_opt->toHexString().substr(2));

                }

        }

 

For the other one (remote_id) use getOption(RAI_OPTION_AGENT_CIRCUIT_ID).

 

itay

 

From: Kea-users [[hidden email]] On Behalf Of Gokulakrishnan Gopalakrishnan
Sent: Tuesday, July 4, 2017 2:20 PM
To: [hidden email]
Subject: [Kea-users] Parsing Option 82

 

I'm trying to print and parse Option 82 but I couldn't understand the format in which it is received. My 'option->toText()' print this

type=082, len=024:,
options:
  type=001, len=014: 01:0c:45:74:68:65:72:6e:65:74:31:2f:32:39
  type=002, len=006: 04:62:73:56:13:bc

 

Can someone help me to understand this value?

 

Thanks,

Gokul

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If you are not the intended recipient, you may not use, copy or disclose
to anyone any of the information in this message. If you have received
this message and are not the intended recipient, kindly notify the sender
and delete this message from your computer.

------------------------------------------------------------
This message contains information that may be confidential or privileged.
If you are not the intended recipient, you may not use, copy or disclose
to anyone any of the information in this message. If you have received
this message and are not the intended recipient, kindly notify the sender
and delete this message from your computer.

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