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Hi,
Those are not the routines to use in this
case, from tvbuff.h:
/** Attach a
TVBUFF_REAL_DATA tvbuff to a parent tvbuff. This connection
* is used
during a tvb_free_chain()... the "child" TVBUFF_REAL_DATA acts
* as if
is part of the chain-of-creation of the parent tvbuff, although it
*
isn't. This is useful if you need to take the data from some tvbuff,
*
run some operation on it, like decryption or decompression, and make a
new
* tvbuff from it, yet want the new tvbuff to be part of the chain.
The reality
* is that the new tvbuff *is* part of the "chain of
creation", but in a way
* that these tvbuff routines is ignorant of.
Use this function to make
* the tvbuff routines knowledgable of this
fact. */
extern void tvb_set_child_real_data_tvbuff(tvbuff_t* parent,
tvbuff_t* child);
/**Sets
parameters for TVBUFF_REAL_DATA. Can throw ReportedBoundsError. */
extern
void tvb_set_real_data(tvbuff_t*, const guint8* data, guint
length,
gint reported_length);
/**
Combination of tvb_new() and tvb_set_real_data(). Can throw ReportedBoundsError.
*/
extern tvbuff_t* tvb_new_real_data(const guint8* data, guint
length,
gint reported_length);
/** Define the subset of the backing buffer to
use.
*
* 'backing_offset' can be negative, to indicate bytes
from
* the end of the backing buffer.
*
*
'backing_length' can be 0, although the usefulness of the buffer
would
* be rather limited.
*
* 'backing_length' of -1
means "to the end of the backing buffer"
*
* Will throw
BoundsError if 'backing_offset'/'length'
* is beyond the bounds of the
backing tvbuff.
* Can throw ReportedBoundsError. */
extern void
tvb_set_subset(tvbuff_t* tvb, tvbuff_t* backing,
gint
backing_offset, gint backing_length, gint reported_length);
/** Combination of tvb_new() and tvb_set_subset()
* Can throw
ReportedBoundsError. */
extern tvbuff_t* tvb_new_subset(tvbuff_t*
backing,
gint backing_offset, gint backing_length, gint
reported_length);
Instead you
should use:
*nevt_tvb =
tvb_new_subset(tvb, offset, length_remaining, len);
Where ofset =
Start of ranap message, and both length parameters = length of ranap
message.
Then
offset =
dissect_ranap_Reset(nevt_tvb , 0,
&actx, xxx_tree, hf_xxx_ranap_reset);
Regards
Anders
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
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