Hi ,
I want to include some RANAP ( asn.1 format) messages in my
dissector.
I have seen the way H245 messages are included in MEGACO. On
similar lines, I have written the following code:
dissect_xxx_reset(tvbuff_t *tvb,int offset ,proto_tree *xxx_tree,packet_info
*pinfo)
{
guint8 *buf = ep_alloc(10240);
tvbuff_t *ranap_tvb;
int i = 0;
asn1_ctx_t actx;
offset = add_IE_indicator(tvb, offset, xxx_tree); /* To add
IE Indicator */
offset = add_IE_length(tvb, offset, xxx_tree);
/* To add IE length */
ranap_tvb = tvb_new_real_data(buf,i,i);
tvb_set_child_real_data_tvbuff(tvb,ranap_tvb);
add_new_data_source(pinfo, ranap_tvb, "RANAP OVER XXX");
asn1_ctx_init(&actx, ASN1_ENC_PER, TRUE, pinfo);
offset = dissect_ranap_Reset(tvb, offset, &actx, xxx_tree,
hf_xxx_ranap_reset);
…………
………
}
But I am not getting any display of RANAP messages.
On the contrary, if I do not use the functions tvb_set_child_real_data_tvbuff,
add_new_data_source, I am getting partial display of the RANAP message.
I could not completely understand the way it is implemented
inn MEGACO.
1. The purpose of the functions tvb_set_child_real_data_tvbuff
and add_new_data_source.
2. The values to be passed to the function tvb_new_real_data.
I have initialised with zero, but its not working out.
So can somebody help me on the above mentioned functions and
how should I go about implementation.
Regards,
Tarani
