465 lines
13 KiB
C
465 lines
13 KiB
C
/* packet-pres.c
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* Routine to dissect ISO 8823 OSI Presentation Protocol packets
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* Based on the dissector by
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* Yuriy Sidelnikov <YSidelnikov@hotmail.com>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#include <epan/prefs.h>
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#include <epan/conversation.h>
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#include <epan/wmem/wmem.h>
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#include <epan/expert.h>
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#include <epan/uat.h>
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#include <string.h>
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#include <epan/asn1.h>
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#include <epan/oids.h>
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#include "packet-ber.h"
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#include "packet-ses.h"
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#include "packet-pres.h"
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#include "packet-rtse.h"
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#define PNAME "ISO 8823 OSI Presentation Protocol"
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#define PSNAME "PRES"
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#define PFNAME "pres"
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#define CLPNAME "ISO 9576-1 OSI Connectionless Presentation Protocol"
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#define CLPSNAME "CLPRES"
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#define CLPFNAME "clpres"
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void proto_register_pres(void);
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void proto_reg_handoff_pres(void);
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/* Initialize the protocol and registered fields */
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static int proto_pres = -1;
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/* Initialize the connectionles protocol */
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static int proto_clpres = -1;
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/* pointers for acse dissector */
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proto_tree *global_tree = NULL;
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packet_info *global_pinfo = NULL;
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static const char *abstract_syntax_name_oid;
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static guint32 presentation_context_identifier;
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/* to keep track of presentation context identifiers and protocol-oids */
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typedef struct _pres_ctx_oid_t {
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guint32 ctx_id;
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char *oid;
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guint32 index;
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} pres_ctx_oid_t;
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static GHashTable *pres_ctx_oid_table = NULL;
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typedef struct _pres_user_t {
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guint ctx_id;
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char *oid;
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} pres_user_t;
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static pres_user_t *pres_users;
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static guint num_pres_users;
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static int hf_pres_CP_type = -1;
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static int hf_pres_CPA_PPDU = -1;
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static int hf_pres_Abort_type = -1;
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static int hf_pres_CPR_PPDU = -1;
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static int hf_pres_Typed_data_type = -1;
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#include "packet-pres-hf.c"
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/* Initialize the subtree pointers */
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static gint ett_pres = -1;
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#include "packet-pres-ett.c"
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static expert_field ei_pres_dissector_not_available = EI_INIT;
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UAT_DEC_CB_DEF(pres_users, ctx_id, pres_user_t)
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UAT_CSTRING_CB_DEF(pres_users, oid, pres_user_t)
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static guint
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pres_ctx_oid_hash(gconstpointer k)
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{
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const pres_ctx_oid_t *pco=(const pres_ctx_oid_t *)k;
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return pco->ctx_id;
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}
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static gint
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pres_ctx_oid_equal(gconstpointer k1, gconstpointer k2)
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{
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const pres_ctx_oid_t *pco1=(const pres_ctx_oid_t *)k1;
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const pres_ctx_oid_t *pco2=(const pres_ctx_oid_t *)k2;
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return (pco1->ctx_id==pco2->ctx_id && pco1->index==pco2->index);
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}
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static void
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pres_init(void)
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{
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if( pres_ctx_oid_table ){
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g_hash_table_destroy(pres_ctx_oid_table);
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pres_ctx_oid_table = NULL;
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}
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pres_ctx_oid_table = g_hash_table_new(pres_ctx_oid_hash,
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pres_ctx_oid_equal);
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}
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static void
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register_ctx_id_and_oid(packet_info *pinfo _U_, guint32 idx, const char *oid)
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{
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pres_ctx_oid_t *pco, *tmppco;
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conversation_t *conversation;
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if(!oid){
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/* we did not get any oid name, malformed packet? */
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return;
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}
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pco=wmem_new(wmem_file_scope(), pres_ctx_oid_t);
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pco->ctx_id=idx;
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pco->oid=wmem_strdup(wmem_file_scope(), oid);
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conversation=find_conversation (pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
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if (conversation) {
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pco->index = conversation->index;
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} else {
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pco->index = 0;
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}
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/* if this ctx already exists, remove the old one first */
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tmppco=(pres_ctx_oid_t *)g_hash_table_lookup(pres_ctx_oid_table, pco);
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if(tmppco){
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g_hash_table_remove(pres_ctx_oid_table, tmppco);
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}
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g_hash_table_insert(pres_ctx_oid_table, pco, pco);
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}
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static char *
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find_oid_in_users_table(packet_info *pinfo, guint32 ctx_id)
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{
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guint i;
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for (i = 0; i < num_pres_users; i++) {
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pres_user_t *u = &(pres_users[i]);
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if (u->ctx_id == ctx_id) {
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/* Register oid so other dissectors can find this connection */
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register_ctx_id_and_oid(pinfo, u->ctx_id, u->oid);
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return u->oid;
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}
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}
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return NULL;
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}
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char *
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find_oid_by_pres_ctx_id(packet_info *pinfo, guint32 idx)
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{
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pres_ctx_oid_t pco, *tmppco;
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conversation_t *conversation;
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pco.ctx_id=idx;
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conversation=find_conversation (pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
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if (conversation) {
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pco.index = conversation->index;
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} else {
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pco.index = 0;
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}
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tmppco=(pres_ctx_oid_t *)g_hash_table_lookup(pres_ctx_oid_table, &pco);
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if(tmppco){
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return tmppco->oid;
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}
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return find_oid_in_users_table(pinfo, idx);
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}
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static void *
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pres_copy_cb(void *dest, const void *orig, size_t len _U_)
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{
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pres_user_t *u = (pres_user_t *)dest;
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const pres_user_t *o = (const pres_user_t *)orig;
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u->ctx_id = o->ctx_id;
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u->oid = g_strdup(o->oid);
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return dest;
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}
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static void
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pres_free_cb(void *r)
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{
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pres_user_t *u = (pres_user_t *)r;
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g_free(u->oid);
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}
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#include "packet-pres-fn.c"
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/*
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* Dissect an PPDU.
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*/
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static int
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dissect_ppdu(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, struct SESSION_DATA_STRUCTURE* local_session)
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{
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proto_item *ti;
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proto_tree *pres_tree;
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struct SESSION_DATA_STRUCTURE* session;
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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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/* do we have spdu type from the session dissector? */
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if( local_session == NULL ){
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proto_tree_add_text(tree, tvb, offset, -1,
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"Internal error:can't get spdu type from session dissector.");
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return 0;
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}
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session = local_session;
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if(session->spdu_type == 0 ){
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proto_tree_add_text(tree, tvb, offset, -1,
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"Internal error:wrong spdu type %x from session dissector.",session->spdu_type);
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return 0;
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}
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/* set up type of PPDU */
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(session->spdu_type, ses_vals, "Unknown PPDU type (0x%02x)"));
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asn1_ctx.private_data = session;
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ti = proto_tree_add_item(tree, proto_pres, tvb, offset, -1, ENC_NA);
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pres_tree = proto_item_add_subtree(ti, ett_pres);
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switch(session->spdu_type){
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case SES_CONNECTION_REQUEST:
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offset = dissect_pres_CP_type(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_CP_type);
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break;
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case SES_CONNECTION_ACCEPT:
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offset = dissect_pres_CPA_PPDU(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_CPA_PPDU);
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break;
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case SES_ABORT:
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case SES_ABORT_ACCEPT:
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offset = dissect_pres_Abort_type(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_Abort_type);
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break;
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case SES_DATA_TRANSFER:
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offset = dissect_pres_CPC_type(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_user_data);
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break;
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case SES_TYPED_DATA:
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offset = dissect_pres_Typed_data_type(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_Typed_data_type);
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break;
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case SES_RESYNCHRONIZE:
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offset = dissect_pres_RS_PPDU(FALSE, tvb, offset, &asn1_ctx, pres_tree, -1);
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break;
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case SES_RESYNCHRONIZE_ACK:
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offset = dissect_pres_RSA_PPDU(FALSE, tvb, offset, &asn1_ctx, pres_tree, -1);
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break;
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case SES_REFUSE:
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offset = dissect_pres_CPR_PPDU(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_CPR_PPDU);
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break;
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default:
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offset = dissect_pres_CPC_type(FALSE, tvb, offset, &asn1_ctx, pres_tree, hf_pres_user_data);
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break;
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}
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return offset;
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}
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static int
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dissect_pres(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data)
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{
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int offset = 0, old_offset;
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struct SESSION_DATA_STRUCTURE* session;
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session = ((struct SESSION_DATA_STRUCTURE*)data);
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/* first, try to check length */
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/* do we have at least 4 bytes */
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if (!tvb_bytes_exist(tvb, 0, 4)){
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if (session && session->spdu_type != SES_MAJOR_SYNC_POINT) {
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proto_tree_add_text(parent_tree, tvb, offset,
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tvb_reported_length_remaining(tvb,offset),"User data");
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return 0; /* no, it isn't a presentation PDU */
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}
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}
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/* save pointers for calling the acse dissector */
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global_tree = parent_tree;
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global_pinfo = pinfo;
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/* if the session unit-data packet then we process it */
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/* as a connectionless presentation protocol unit data */
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if(session && session->spdu_type == CLSES_UNIT_DATA)
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{
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proto_tree * clpres_tree = NULL;
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proto_item *ti;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CL-PRES");
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col_clear(pinfo->cinfo, COL_INFO);
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if (parent_tree)
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{
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ti = proto_tree_add_item(parent_tree, proto_clpres, tvb, offset, -1, ENC_NA);
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clpres_tree = proto_item_add_subtree(ti, ett_pres);
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}
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/* dissect the packet */
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dissect_UD_type_PDU(tvb, pinfo, clpres_tree);
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return tvb_length(tvb);
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}
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/* we can't make any additional checking here */
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/* postpone it before dissector will have more information */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PRES");
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col_clear(pinfo->cinfo, COL_INFO);
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if (session && session->spdu_type == SES_MAJOR_SYNC_POINT) {
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/* This is a reassembly initiated in packet-ses */
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char *oid = find_oid_by_pres_ctx_id (pinfo, session->pres_ctx_id);
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if (oid) {
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call_ber_oid_callback (oid, tvb, offset, pinfo, parent_tree, session);
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} else {
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proto_tree_add_text(parent_tree, tvb, offset,
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tvb_reported_length_remaining(tvb,offset),"User data");
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}
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return tvb_length(tvb);
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}
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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_ppdu(tvb, offset, pinfo, parent_tree, session);
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if(offset <= old_offset){
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proto_tree_add_text(parent_tree, tvb, offset, -1,"Invalid offset");
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THROW(ReportedBoundsError);
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}
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}
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return tvb_length(tvb);
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}
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/*--- proto_register_pres -------------------------------------------*/
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void proto_register_pres(void) {
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/* List of fields */
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static hf_register_info hf[] = {
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{ &hf_pres_CP_type,
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{ "CP-type", "pres.cptype",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_pres_CPA_PPDU,
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{ "CPA-PPDU", "pres.cpapdu",
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FT_NONE, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_pres_Abort_type,
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{ "Abort type", "pres.aborttype",
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FT_UINT32, BASE_DEC, VALS(pres_Abort_type_vals), 0,
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NULL, HFILL }},
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{ &hf_pres_CPR_PPDU,
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{ "CPR-PPDU", "pres.cprtype",
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FT_UINT32, BASE_DEC, VALS(pres_CPR_PPDU_vals), 0,
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NULL, HFILL }},
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{ &hf_pres_Typed_data_type,
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{ "Typed data type", "pres.Typed_data_type",
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FT_UINT32, BASE_DEC, VALS(pres_Typed_data_type_vals), 0,
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NULL, HFILL }},
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#include "packet-pres-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_pres,
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#include "packet-pres-ettarr.c"
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};
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static ei_register_info ei[] = {
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{ &ei_pres_dissector_not_available, { "pres.dissector_not_available", PI_UNDECODED, PI_WARN, "Dissector is not available", EXPFILL }},
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};
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static uat_field_t users_flds[] = {
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UAT_FLD_DEC(pres_users,ctx_id,"Context Id","Presentation Context Identifier"),
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UAT_FLD_CSTRING(pres_users,oid,"Syntax Name OID","Abstract Syntax Name (Object Identifier)"),
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UAT_END_FIELDS
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};
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uat_t* users_uat = uat_new("PRES Users Context List",
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sizeof(pres_user_t),
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"pres_context_list",
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TRUE,
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(void**) &pres_users,
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&num_pres_users,
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UAT_AFFECTS_DISSECTION, /* affects dissection of packets, but not set of named fields */
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"ChPresContextList",
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pres_copy_cb,
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NULL,
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pres_free_cb,
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NULL,
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users_flds);
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expert_module_t* expert_pres;
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module_t *pres_module;
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/* Register protocol */
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proto_pres = proto_register_protocol(PNAME, PSNAME, PFNAME);
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new_register_dissector("pres", dissect_pres, proto_pres);
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/* Register connectionless protocol (just for the description) */
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proto_clpres = proto_register_protocol(CLPNAME, CLPSNAME, CLPFNAME);
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/* Register fields and subtrees */
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proto_register_field_array(proto_pres, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_pres = expert_register_protocol(proto_pres);
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expert_register_field_array(expert_pres, ei, array_length(ei));
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register_init_routine(pres_init);
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pres_module = prefs_register_protocol(proto_pres, NULL);
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prefs_register_uat_preference(pres_module, "users_table", "Users Context List",
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"A table that enumerates user protocols to be used against"
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" specific presentation context identifiers",
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users_uat);
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}
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/*--- proto_reg_handoff_pres ---------------------------------------*/
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void proto_reg_handoff_pres(void) {
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/* register_ber_oid_dissector("0.4.0.0.1.1.1.1", dissect_pres, proto_pres,
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"itu-t(0) identified-organization(4) etsi(0) mobileDomain(0) gsm-Network(1) abstractSyntax(1) pres(1) version1(1)"); */
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}
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