osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/asn1/ansi_tcap/packet-ansi_tcap-template.c

460 lines
16 KiB
C
Raw Blame History

/* packet-ansi_tcap-template.c
* Routines for ANSI TCAP
* Copyright 2007 Anders Broman <anders.broman@ericsson.com>
* Built from the gsm-map dissector Copyright 2004 - 2005, Anders Broman <anders.broman@ericsson.com>
*
* $Id$
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* References: T1.114
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/oids.h>
#include <epan/emem.h>
#include <epan/asn1.h>
#include <epan/strutil.h>
#include <string.h>
#include "packet-ber.h"
#include "packet-tcap.h"
#include "packet-ansi_tcap.h"
#include <epan/tcap-persistentdata.h>
#define PNAME "ANSI Transaction Capabilities Application Part"
#define PSNAME "ANSI_TCAP"
#define PFNAME "ansi_tcap"
/* Initialize the protocol and registered fields */
static int proto_ansi_tcap = -1;
static int hf_ansi_tcapsrt_SessionId = -1;
static int hf_ansi_tcapsrt_Duplicate = -1;
static int hf_ansi_tcapsrt_BeginSession = -1;
static int hf_ansi_tcapsrt_EndSession = -1;
static int hf_ansi_tcapsrt_SessionTime = -1;
#include "packet-ansi_tcap-hf.c"
/* Initialize the subtree pointers */
static gint ett_tcap = -1;
static gint ett_param = -1;
static gint ett_otid = -1;
static gint ett_dtid = -1;
static gint ett_ansi_tcap_stat = -1;
static struct tcapsrt_info_t * gp_tcapsrt_info;
static gboolean tcap_subdissector_used=FALSE;
static struct tcaphash_context_t * gp_tcap_context=NULL;
#include "packet-ansi_tcap-ett.c"
#define MAX_SSN 254
extern gboolean gtcap_PersistentSRT;
extern guint gtcap_RepetitionTimeout;
extern guint gtcap_LostTimeout;
static dissector_table_t ber_oid_dissector_table=NULL;
static const char * cur_oid;
static const char * tcapext_oid;
static proto_tree * tcap_top_tree=NULL;
static proto_tree * tcap_stat_tree=NULL;
static proto_item * tcap_stat_item=NULL;
static dissector_handle_t ansi_map_handle;
struct ansi_tcap_private_t ansi_tcap_private;
#define MAX_TID_STR_LEN 1024
static void ansi_tcap_ctx_init(struct ansi_tcap_private_t *a_tcap_ctx) {
memset(a_tcap_ctx, '\0', sizeof(*a_tcap_ctx));
a_tcap_ctx->signature = ANSI_TCAP_CTX_SIGNATURE;
a_tcap_ctx->oid_is_present = FALSE;
a_tcap_ctx->TransactionID_str = NULL;
}
static void dissect_ansi_tcap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree);
/*
static dissector_handle_t tcap_handle = NULL;
static dissector_table_t sccp_ssn_table;
static GHashTable* ansi_sub_dissectors = NULL;
static GHashTable* itu_sub_dissectors = NULL;
extern void add_ansi_tcap_subdissector(guint32 ssn, dissector_handle_t dissector) {
g_hash_table_insert(ansi_sub_dissectors,GUINT_TO_POINTER(ssn),dissector);
dissector_add_uint("sccp.ssn",ssn,tcap_handle);
}
extern void delete_ansi_tcap_subdissector(guint32 ssn, dissector_handle_t dissector _U_) {
g_hash_table_remove(ansi_sub_dissectors,GUINT_TO_POINTER(ssn));
dissector_delete_uint("sccp.ssn",ssn,tcap_handle);
}
dissector_handle_t get_ansi_tcap_subdissector(guint32 ssn) {
return g_hash_table_lookup(ansi_sub_dissectors,GUINT_TO_POINTER(ssn));
}
*/
/* Transaction tracking */
/* Transaction table */
struct ansi_tcap_invokedata_t {
gint OperationCode;
/*
0 : national,
1 : private
*/
gint32 OperationCode_private;
gint32 OperationCode_national;
};
static GHashTable *TransactionId_table=NULL;
static void
TransactionId_table_cleanup(gpointer key , gpointer value, gpointer user_data _U_){
struct ansi_tcap_invokedata_t *ansi_tcap_saved_invokedata = value;
gchar *TransactionId_str = key;
g_free(TransactionId_str);
g_free(ansi_tcap_saved_invokedata);
}
void
ansi_tcap_init_transaction_table(void){
/* Destroy any existing memory chunks / hashes. */
if (TransactionId_table){
g_hash_table_foreach(TransactionId_table, TransactionId_table_cleanup, NULL);
g_hash_table_destroy(TransactionId_table);
TransactionId_table = NULL;
}
TransactionId_table = g_hash_table_new(g_str_hash, g_str_equal);
}
static void
ansi_tcap_init_protocol(void)
{
ansi_tcap_init_transaction_table();
}
/* Store Invoke information needed for the corresponding reply */
static void
save_invoke_data(packet_info *pinfo, proto_tree *tree _U_, tvbuff_t *tvb _U_){
struct ansi_tcap_invokedata_t *ansi_tcap_saved_invokedata;
address* src = &(pinfo->src);
address* dst = &(pinfo->dst);
char *buf;
if ((!pinfo->fd->flags.visited)&&(ansi_tcap_private.TransactionID_str)){
/* Only do this once XXX I hope its the right thing to do */
/* The hash string needs to contain src and dest to distiguish differnt flows */
buf = ep_alloc(MAX_TID_STR_LEN);
buf[0] = '\0';
g_snprintf(buf, MAX_TID_STR_LEN, "%s%s%s",
ansi_tcap_private.TransactionID_str, ep_address_to_str(src),
ep_address_to_str(dst));
/* If the entry allready exists don't owervrite it */
ansi_tcap_saved_invokedata = g_hash_table_lookup(TransactionId_table,buf);
if(ansi_tcap_saved_invokedata)
return;
ansi_tcap_saved_invokedata = g_malloc(sizeof(struct ansi_tcap_invokedata_t));
ansi_tcap_saved_invokedata->OperationCode = ansi_tcap_private.d.OperationCode;
ansi_tcap_saved_invokedata->OperationCode_national = ansi_tcap_private.d.OperationCode_national;
ansi_tcap_saved_invokedata->OperationCode_private = ansi_tcap_private.d.OperationCode_private;
g_hash_table_insert(TransactionId_table,
g_strdup(buf),
ansi_tcap_saved_invokedata);
/*
g_warning("Tcap Invoke Hash string %s",buf);
*/
}
}
static gboolean
find_saved_invokedata(packet_info *pinfo, proto_tree *tree _U_, tvbuff_t *tvb _U_){
struct ansi_tcap_invokedata_t *ansi_tcap_saved_invokedata;
address* src = &(pinfo->src);
address* dst = &(pinfo->dst);
char *buf;
if (!ansi_tcap_private.TransactionID_str) {
return FALSE;
}
/* The hash string needs to contain src and dest to distiguish differnt flows */
buf = ep_alloc(MAX_TID_STR_LEN);
buf[0] = '\0';
/* Reverse order to invoke */
g_snprintf(buf, MAX_TID_STR_LEN, "%s%s%s",
ansi_tcap_private.TransactionID_str, ep_address_to_str(dst),
ep_address_to_str(src));
ansi_tcap_saved_invokedata = g_hash_table_lookup(TransactionId_table, buf);
if(ansi_tcap_saved_invokedata){
ansi_tcap_private.d.OperationCode = ansi_tcap_saved_invokedata->OperationCode;
ansi_tcap_private.d.OperationCode_national = ansi_tcap_saved_invokedata->OperationCode_national;
ansi_tcap_private.d.OperationCode_private = ansi_tcap_saved_invokedata->OperationCode_private;
return TRUE;
}
return FALSE;
}
/* As currently ANSI MAP is the only possible sub dissector this function
* must be improved to handle general cases.
*
*
*
* TODO:
* 1)Handle national codes
* Design option
* - Create a ansi.tcap.national dissector table and have dissectors for
* national codes register there and let ansi tcap call them.
* 2)Handle Private codes properly
* Design question
* Unclear how to differentiate between different private "code sets".
* Use SCCP SSN table as before? or a ansi.tcap.private dissector table?
*
*/
static gboolean
find_tcap_subdissector(tvbuff_t *tvb, asn1_ctx_t *actx, proto_tree *tree){
proto_item *item;
/* If "DialoguePortion objectApplicationId ObjectIDApplicationContext
* points to the subdissector this code can be used.
*
if(ansi_tcap_private.d.oid_is_present){
call_ber_oid_callback(ansi_tcap_private.objectApplicationId_oid, tvb, 0, actx-pinfo, tree);
return TRUE;
}
*/
if(ansi_tcap_private.d.pdu == 1){
/* Save Invoke data for this transaction */
save_invoke_data(actx->pinfo, tree, tvb);
}else{
/* Get saved data for this transaction */
if(find_saved_invokedata(actx->pinfo, tree, tvb)){
if(ansi_tcap_private.d.OperationCode == 0){
/* national */
item = proto_tree_add_int(tree, hf_ansi_tcap_national, tvb, 0, 0, ansi_tcap_private.d.OperationCode_national);
}else{
item = proto_tree_add_int(tree, hf_ansi_tcap_private, tvb, 0, 0, ansi_tcap_private.d.OperationCode_private);
}
PROTO_ITEM_SET_GENERATED(item);
ansi_tcap_private.d.OperationCode_item = item;
}
}
if(ansi_tcap_private.d.OperationCode == 0){
/* national */
item = proto_tree_add_text(tree, tvb, 0, -1,
"Dissector for ANSI TCAP NATIONAL code:%u not implemented. Contact Wireshark developers if you want this supported",
ansi_tcap_private.d.OperationCode_national);
PROTO_ITEM_SET_GENERATED(item);
return FALSE;
}else if(ansi_tcap_private.d.OperationCode == 1){
/* private */
if((ansi_tcap_private.d.OperationCode_private & 0x0900) != 0x0900){
item = proto_tree_add_text(tree, tvb, 0, -1,
"Dissector for ANSI TCAP PRIVATE code:%u not implemented. Contact Wireshark developers if you want this supported",
ansi_tcap_private.d.OperationCode_private);
PROTO_ITEM_SET_GENERATED(item);
return FALSE;
}
}
/* This is abit of a hack as it assumes the private codes with a "family" of 0x09 is ANSI MAP
* See TODO above.
* N.S0005-0 v 1.0 TCAP Formats and Procedures 5-16 Application Services
* 6.3.2 Component Portion
* The Operation Code is partitioned into an Operation Family followed by a
* Specifier associated with each Operation Family member. For TIA/EIA-41 the
* Operation Family is coded as decimal 9. Bit H of the Operation Family is always
* coded as 0.
*/
call_dissector(ansi_map_handle, tvb, actx->pinfo, tcap_top_tree);
return TRUE;
}
#include "packet-ansi_tcap-fn.c"
static void
dissect_ansi_tcap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
proto_item *item=NULL;
proto_tree *tree=NULL;
#if 0
proto_item *stat_item=NULL;
proto_tree *stat_tree=NULL;
gint offset = 0;
struct tcaphash_context_t * p_tcap_context;
dissector_handle_t subdissector_handle;
#endif
asn1_ctx_t asn1_ctx;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
ansi_tcap_ctx_init(&ansi_tcap_private);
tcap_top_tree = parent_tree;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ANSI TCAP");
/* create display subtree for the protocol */
if(parent_tree){
item = proto_tree_add_item(parent_tree, proto_ansi_tcap, tvb, 0, -1, FALSE);
tree = proto_item_add_subtree(item, ett_tcap);
tcap_stat_item=item;
tcap_stat_tree=tree;
}
cur_oid = NULL;
tcapext_oid = NULL;
pinfo->private_data = &ansi_tcap_private;
gp_tcapsrt_info=tcapsrt_razinfo();
tcap_subdissector_used=FALSE;
gp_tcap_context=NULL;
dissect_ansi_tcap_PackageType(FALSE, tvb, 0, &asn1_ctx, tree, -1);
#if 0 /* Skip this part for now it will be rewritten */
if (g_ansi_tcap_HandleSRT && !tcap_subdissector_used ) {
if (gtcap_DisplaySRT && tree) {
stat_item = proto_tree_add_text(tree, tvb, 0, 0, "Stat");
PROTO_ITEM_SET_GENERATED(stat_item);
stat_tree = proto_item_add_subtree(stat_item, ett_ansi_tcap_stat);
}
p_tcap_context=tcapsrt_call_matching(tvb, pinfo, stat_tree, gp_tcapsrt_info);
ansi_tcap_private.context=p_tcap_context;
/* If the current message is TCAP only,
* save the Application contexte name for the next messages
*/
if ( p_tcap_context && cur_oid && !p_tcap_context->oid_present ) {
/* Save the application context and the sub dissector */
g_strlcpy(p_tcap_context->oid, cur_oid, sizeof(p_tcap_context->oid));
if ( (subdissector_handle = dissector_get_string_handle(ber_oid_dissector_table, cur_oid)) ) {
p_tcap_context->subdissector_handle=subdissector_handle;
p_tcap_context->oid_present=TRUE;
}
}
if (g_ansi_tcap_HandleSRT && p_tcap_context && p_tcap_context->callback) {
/* Callback fonction for the upper layer */
(p_tcap_context->callback)(tvb, pinfo, stat_tree, p_tcap_context);
}
}
#endif
}
void
proto_reg_handoff_ansi_tcap(void)
{
ansi_map_handle = find_dissector("ansi_map");
ber_oid_dissector_table = find_dissector_table("ber.oid");
}
void
proto_register_ansi_tcap(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
/* Tcap Service Response Time */
{ &hf_ansi_tcapsrt_SessionId,
{ "Session Id",
"ansi_tcap.srt.session_id",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_ansi_tcapsrt_BeginSession,
{ "Begin Session",
"ansi_tcap.srt.begin",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"SRT Begin of Session", HFILL }
},
{ &hf_ansi_tcapsrt_EndSession,
{ "End Session",
"ansi_tcap.srt.end",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"SRT End of Session", HFILL }
},
{ &hf_ansi_tcapsrt_SessionTime,
{ "Session duration",
"ansi_tcap.srt.sessiontime",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
"Duration of the TCAP session", HFILL }
},
{ &hf_ansi_tcapsrt_Duplicate,
{ "Request Duplicate",
"ansi_tcap.srt.duplicate",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
#include "packet-ansi_tcap-hfarr.c"
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_tcap,
&ett_param,
&ett_otid,
&ett_dtid,
&ett_ansi_tcap_stat,
#include "packet-ansi_tcap-ettarr.c"
};
/*static enum_val_t tcap_options[] = {
{ "itu", "ITU", ITU_TCAP_STANDARD },
{ "ansi", "ANSI", ANSI_TCAP_STANDARD },
{ NULL, NULL, 0 }
};*/
/* Register the protocol name and description */
proto_ansi_tcap = proto_register_protocol(PNAME, PSNAME, PFNAME);
register_dissector("ansi_tcap", dissect_ansi_tcap, proto_ansi_tcap);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_ansi_tcap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine(&ansi_tcap_init_protocol);
}
View Git Blame Copy Permalink