170 lines
4.3 KiB
C
170 lines
4.3 KiB
C
/* packet-mms_asn1.c
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*
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* Ronnie Sahlberg 2005
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/prefs.h>
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#include <epan/packet.h>
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#include <epan/asn1.h>
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#include <epan/expert.h>
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#include <epan/nstime.h>
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#include "packet-ber.h"
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#include "packet-acse.h"
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#include "packet-mms.h"
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#define PNAME "MMS"
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#define PSNAME "MMS"
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#define PFNAME "mms"
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/* Initialize the protocol and registered fields */
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static int proto_mms = -1;
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#include "packet-mms-hf.c"
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/* Initialize the subtree pointers */
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static gint ett_mms = -1;
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#include "packet-mms-ett.c"
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#include "packet-mms-fn.c"
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/*
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* Dissect MMS PDUs inside a PPDU.
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*/
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static void
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dissect_mms(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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int offset = 0;
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int old_offset;
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proto_item *item=NULL;
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proto_tree *tree=NULL;
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asn1_ctx_t asn1_ctx;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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if(parent_tree){
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item = proto_tree_add_item(parent_tree, proto_mms, tvb, 0, -1, FALSE);
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tree = proto_item_add_subtree(item, ett_mms);
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MMS");
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col_clear(pinfo->cinfo, COL_INFO);
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while (tvb_reported_length_remaining(tvb, offset) > 0){
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old_offset=offset;
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offset=dissect_mms_MMSpdu(FALSE, tvb, offset, &asn1_ctx , tree, -1);
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if(offset == old_offset){
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proto_tree_add_text(tree, tvb, offset, -1,"Internal error, zero-byte MMS PDU");
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offset = tvb_length(tvb);
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break;
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}
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}
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}
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/*--- proto_register_mms -------------------------------------------*/
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void proto_register_mms(void) {
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/* List of fields */
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static hf_register_info hf[] =
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{
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#include "packet-mms-hfarr.c"
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};
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/* List of subtrees */
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static gint *ett[] = {
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&ett_mms,
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#include "packet-mms-ettarr.c"
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};
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/* Register protocol */
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proto_mms = proto_register_protocol(PNAME, PSNAME, PFNAME);
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register_dissector("mms", dissect_mms, proto_mms);
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/* Register fields and subtrees */
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proto_register_field_array(proto_mms, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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static gboolean
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dissect_mms_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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/* must check that this really is an mms packet */
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int offset = 0;
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guint32 length = 0 ;
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guint32 oct;
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gint idx = 0 ;
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gint8 tmp_class;
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gboolean tmp_pc;
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gint32 tmp_tag;
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/* first, check do we have at least 2 bytes (pdu) */
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if (!tvb_bytes_exist(tvb, 0, 2))
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return FALSE; /* no */
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/* can we recognize MMS PDU ? Return FALSE if not */
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/* get MMS PDU type */
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offset = get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag);
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/* check MMS type */
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/* Class should be constructed */
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if (tmp_class!=BER_CLASS_CON)
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return FALSE;
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/* see if the tag is a valid MMS PDU */
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match_strval_idx(tmp_tag, mms_MMSpdu_vals, &idx);
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if (idx == -1) {
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return FALSE; /* no, it isn't an MMS PDU */
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}
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/* check MMS length */
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oct = tvb_get_guint8(tvb, offset)& 0x7F;
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if (oct==0)
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/* MMS requires length after tag so not MMS if indefinite length*/
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return FALSE;
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offset = get_ber_length(tvb, offset, &length, NULL);
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/* do we have enough bytes? */
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if (!tvb_bytes_exist(tvb, offset, length))
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return FALSE;
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dissect_mms(tvb, pinfo, parent_tree);
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return TRUE;
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}
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/*--- proto_reg_handoff_mms --- */
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void proto_reg_handoff_mms(void) {
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register_ber_oid_dissector("1.0.9506.2.3", dissect_mms, proto_mms,"MMS");
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register_ber_oid_dissector("1.0.9506.2.1", dissect_mms, proto_mms,"mms-abstract-syntax-version1(1)");
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heur_dissector_add("cotp", dissect_mms_heur, proto_mms);
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heur_dissector_add("cotp_is", dissect_mms_heur, proto_mms);
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}
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