static gboolean
dissect_mms_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
/* must check that this really is an mms packet */
int offset = 0;
guint32 length = 0 ;
guint32 oct;
gint idx = 0 ;
gint8 tmp_class;
gboolean tmp_pc;
gint32 tmp_tag;
/* first, check do we have at least 2 bytes (pdu) */
if (!tvb_bytes_exist(tvb, 0, 2))
return FALSE; /* no */
/* can we recognize MMS PDU ? Return FALSE if not */
/* get MMS PDU type */
offset = get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag);
/* check MMS type */
/* Class should be constructed */
if (tmp_class!=BER_CLASS_CON)
return FALSE;
/* see if the tag is a valid MMS PDU */
match_strval_idx(tmp_tag, mms_MMSpdu_vals, &idx);
if (idx == -1) {
return FALSE; /* no, it isn't an MMS PDU */
}
/* check MMS length */
oct = tvb_get_guint8(tvb, offset)& 0x7F;
if (oct==0)
/* MMS requires length after tag so not MMS if indefinite length*/
return FALSE;
offset = get_ber_length(tvb, offset, &length, NULL);
/* do we have enough bytes? */
if (!tvb_bytes_exist(tvb, offset, length))
return FALSE;
dissect_mms(tvb, pinfo, parent_tree);
return TRUE;
}
/* Like match_strval_idx(), but doesn't return the index. */
const gchar*
match_strval(guint32 val, const value_string *vs) {
gint ignore_me;
return match_strval_idx(val, vs, &ignore_me);
}
