OOPS: dissector table "terel2" doesn't exist

asked 2022-12-05 07:39:46 +0000

updated 2022-12-05 09:01:29 +0000

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I have tried to add a new dissector named "terel2". Below is the piece of code I have used for the proto_reg_handoff_xxx

void
proto_reg_handoff_TEREL2(void)
{

    g_print("LLY-DEBUG: proto_reg_handoff_TEREL2\n");
    dissector_add_uint("terel2", TEREL2_TCP_PORTS, TEREL2_handle);
}

It kept telling me the below error message: OOPS: dissector table "terel2" doesn't exist Protocol being registered is "TEREL2 PROTOCOL"

And it seemed the debug message I have put in the dissector_terel2() never got hit.

Could anyone please help?

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answered 2022-12-05 09:09:54 +0000

Jaap

13742 ●711 ●115

You probably misunderstood the meaning of the proto_reg_handoff function. It is called after the individual dissectors have registered themselves, so that the relations between the dissectors can be established. So what you do here is say, he other dissector, if you find your packet refers to this identifier I can handle that. For example the UDP dissector has a table called "udp.port" where you can register to if your dissector handles UDP payloads on a certain UDP port. So the call in your handoff function would be for instance dissector_add_uint("udp.port", 6789, my_dissector_handle). Now, can you predict what the first parameter in your dissector_add_uint() should be?

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Hi Jaap, Thanks for you comment.

Below is the code for register my new dissector

void
proto_register_TEREL2(void)
{

    g_print("LLY-DEBUG: proto_register_TEREL2\n");
    /* Setup list of header fields  See Section 1.5 of README.dissector for
     * details. */
    static hf_register_info hf[] = {
        { &hf_FIELDTEREL2,
          { "FIELDTEREL2", "TEREL2",
            FT_BYTES, BASE_NONE, NULL, 0x0,
            "FIELDTEREL2 is for TERADYNE EL2 Raw data packet", HFILL }
        }
    };

    /* Setup protocol subtree array */
    static gint* ett[] = {
        &ett_TEREL2
    };

    /* Register the protocol name and description */
    proto_TEREL2 = proto_register_protocol("TEREL2 PROTOCOL",
        "TEREL2", "terel2");

    /* Required function calls to register the header fields and subtrees */
    proto_register_field_array(proto_TEREL2, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    /* Use register_dissector() here so that the dissector can be
     * found by name by other protocols, by Lua, by Export PDU,
     * by custom User DLT dissection, etc. Some protocols may require
     * multiple uniquely named dissectors that behave differently
     * depending on the caller, e.g. over TCP directly vs over TLS.
     */
    g_print("LLY-DEBUG: register_dissector\n");
    TEREL2_handle = register_dissector("TEREL2 ...

(more)

Asfastasucan ( 2022-12-05 11:44:57 +0000 )edit

What do you mean by raw packet data? Is the data carried over Ethernet? Then is should have its own ethertype. Is it carried over IP? Then it should have its own IP protocol number.

Jaap ( 2022-12-05 12:04:08 +0000 )edit

this dissector isn't using any UDP port or TCP port.

They why were you doing dissector_add_uint("terel2", TEREL2_TCP_PORTS, TEREL2_handle);?

It is meant to decode the raw data packet.

So, as Jaap asked, does this protocol run arp some other protocol (UDP, TCP, Ethernet, IP, etc.) or does it have its own link layer?

Guy Harris ( 2022-12-05 22:12:42 +0000 )edit

No TCP or UDP protocols. The piece of code I wrote is a modification from the packet-PROTOABBREV.c. I am really new to develop dissector, so I don't really understand the purpose of dissector_add_uint. I thought it just add the new dissector to the dissector table but apparently that is not the case. Actually the only indication of the data packet is the byte 16, all I want is to extract that byte 16 and it will tell me the type of packets. The usual ethertype byte is actually the length of data, so that is not accurate.

Asfastasucan ( 2022-12-06 12:09:08 +0000 )edit

Then let me rephrase the question: on what data link are your packets put in the PCAP file?

Jaap ( 2022-12-06 14:50:11 +0000 )edit

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OOPS: dissector table "terel2" doesn't exist

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