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NAS-EPS: added heuristic udp dissector 

Change-Id: I5df909ac55be5d00f73bd2403b2c7d4b3d1494ca
Reviewed-on: https://code.wireshark.org/review/26050
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Martin Mathieson <martin.r.mathieson@googlemail.com>
This commit is contained in:
Mathias Kurth 2018-02-23 15:31:18 +01:00 committed by Martin Mathieson
parent 8451a8efda
commit 51165cfcb7
1 changed files with 35 additions and 0 deletions
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35
epan/dissectors/packet-nas_eps.c
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@ -7750,9 +7750,44 @@ proto_register_nas_eps(void)
&g_nas_eps_user_data_container_as_ip);
}
/* Heuristic dissector looks for "nas-eps" string at packet start */
static gboolean dissect_nas_eps_heur(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, void *data _U_)
{
gint offset = 0;
tvbuff_t *nas_tvb;
/* Needs to be at least as long as:
- the signature string
- at least one byte of NAS PDU payload */
if (tvb_captured_length_remaining(tvb, offset) < (gint)(strlen(PFNAME)+1)) {
return FALSE;
}
/* OK, compare with signature string */
if (tvb_strneql(tvb, offset, PFNAME, strlen(PFNAME)) != 0) {
return FALSE;
}
offset += (gint)strlen(PFNAME);
/* Clear protocol name */
col_clear(pinfo->cinfo, COL_PROTOCOL);
/* Clear info column */
col_clear(pinfo->cinfo, COL_INFO);
/* Create tvb that starts at actual NAS PDU */
nas_tvb = tvb_new_subset_remaining(tvb, offset);
dissect_nas_eps(nas_tvb, pinfo, tree, NULL);
return TRUE;
}
void
proto_reg_handoff_nas_eps(void)
{
heur_dissector_add("udp", dissect_nas_eps_heur, "NAS-EPS over UDP", "nas_eps_udp", proto_nas_eps, HEURISTIC_DISABLE);
gsm_a_dtap_handle = find_dissector_add_dependency("gsm_a_dtap", proto_nas_eps);
lpp_handle = find_dissector_add_dependency("lpp", proto_nas_eps);
nbifom_handle = find_dissector_add_dependency("nbifom", proto_nas_eps);