Wireshark-dev: Re: [Wireshark-dev] query regarding gtp_handle funtion and decoderfunction.
Hi,
Are
you adding decoding of:
#define GTP_EXT_OMC_ID 0x8F /* 3G 143
TLV OMC Identity 7.7.42 */
If so
what you need to do is to add code in
Line
4487
static
int
decode_gtp_omc_id(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
proto_tree *tree) {
guint16 length;
length = tvb_get_ntohs(tvb, offset + 1);
proto_tree_add_text(tree, tvb, offset, 3+length, "%s length : %u",
val_to_str(GTP_EXT_OMC_ID, gtp_val, "Unknown"), length);
return 3 + length;
}
To do
the actual decoding.
Best
regards
Anders
Hi all,
I'm adding a decoder for the gtp protocol. My query is :
1 ) So gtp_handle will do the dissection. It refers to the file
packet_gtp.c .
Finds the hex value for example in the following statement :
#define
GTP_EXT_XXX 0x8f
and then if its value in the header matches 0x8f, refers to the (val,
decode_fun) pair and then calls decode_fun to handle the decoding.
Now my question is : will the pointer tvb ( which is tvb_buff * tvb) be
incremented automatically when it enters the function decode_fun ? Or we have to
explicitly increment the pointer tvb in the decoder functin to account for the
byte containing 0x8f value in the tvb?
My other questions are :
2) I'm trying to locate the file containing the definition for the function
gtp_handle. But I'm not able to find it. Kindly can one please tell me where its
definition is?
3) Before actually starting the decoding in our decode function what is the
code that we have to write and what that is for?
regards,
Prashanth
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