Wireshark · Wireshark-dev: [Wireshark-dev] Problems while displaying the digits in the packet

[<taraniteja.vishwanatha@xxxxxxxxx>]

Hi ,

 

We have a parameter IMSI in our protocol . It has the following format :

 

7	6	5	4	3	2	1	0	octet
Number of digits								3
IMSI digit 2				IMSI digit 1				4
IMSI digit 4				IMSI digit 3				5
IMSI digit 2n				IMSI digit 2n-1				n+3

 

typedef struct dgt_set_t

{

    unsigned char out[15];

}

dgt_set_t;

 

static dgt_set_t Dgt1_9_bcd = {

    {

     '0','1','2','3','4','5','6','7','8','9','?','?','?','?','?'

    }

};

 

char *digit_str;

 

digit_str = unpack_digits(tvb, offset, &Dgt1_9_bcd);

 

proto_tree_add_string(tree, hf_xyz_imsi, tvb, (imsi_len/2 + 1), (imsi_len/2 + 1), digit_str);

 

return offset + imsi_len/2 + 1;

 

static char*

unpack_digits(tvbuff_t *tvb, int offset, dgt_set_t *dgt){

 

        int length;

        guint8 octet;

        int i=0;

        char *digit_str;

 

        length = tvb_length(tvb);

        if (length < offset)

                return "";

        digit_str = ep_alloc((length - offset)*2+1);

 

        while ( offset < length ){

 

                octet = tvb_get_guint8(tvb,offset);

 

                digit_str[i] = dgt->out[octet & 0x0f];

                i++;

 

                /* unpack second value in byte */

                octet = octet >> 4;

 

                if (octet == 0x0f)      /* odd number bytes - hit filler */

                        break;

 

                digit_str[i] = dgt->out[octet & 0x0f];

                i++;

                offset++;

 

        }

        digit_str[i]= '\0';

        return digit_str;

}

 

When the above code snippet is executed, we are getting the following error:

 

Warn Dissector bug, protocol MACIC, in packet 1: proto.c:1859: failed assertion "hfinfo->type == FT_STRING || hfinfo->type == FT_STRINGZ"

 

Your help is appreciated .

 

//Tarani

 

 

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