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/* packet-q932.c
* Routines for Q.932 packet dissection
* 2007 Tomas Kukosa
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/strutil.h>
#include <epan/asn1.h>
#include <epan/prefs.h>
#include "packet-ber.h"
#include "packet-q932.h"
#define PNAME "Q.932"
#define PSNAME "Q932"
#define PFNAME "q932"
void proto_register_q932(void);
/* Initialize the protocol and registered fields */
static int proto_q932 = -1;
static int hf_q932_ie_type = -1;
static int hf_q932_ie_len = -1;
static int hf_q932_ie_data = -1;
static int hf_q932_pp = -1;
static int hf_q932_nd = -1;
#include "packet-q932-hf.c"
/* Initialize the subtree pointers */
static gint ett_q932 = -1;
static gint ett_q932_ie = -1;
#include "packet-q932-ett.c"
static expert_field ei_q932_dse_not_supported = EI_INIT;
static expert_field ei_q932_acse_not_supported = EI_INIT;
static expert_field ei_q932_unknown_component = EI_INIT;
static expert_field ei_q932_asn1_encoded = EI_INIT;
/* Preferences */
/* ROSE context */
static rose_ctx_t q932_rose_ctx;
dissector_table_t qsig_arg_local_dissector_table;
dissector_table_t qsig_res_local_dissector_table;
dissector_table_t qsig_err_local_dissector_table;
dissector_table_t etsi_arg_local_dissector_table;
dissector_table_t etsi_res_local_dissector_table;
dissector_table_t etsi_err_local_dissector_table;
#define FACILITY_QSIG 0
#define FACILITY_ETSI 1
static gint g_facility_encoding = FACILITY_QSIG;
void proto_reg_handoff_q932(void);
/* Subdissectors */
static dissector_handle_t q932_ros_handle;
#define Q932_IE_EXTENDED_FACILITY 0x0D
#define Q932_IE_FACILITY 0x1C
#define Q932_IE_NOTIFICATION_INDICATOR 0x27
#define Q932_IE_INFORMATION_REQUEST 0x32
#define Q932_IE_FEATURE_ACTIVATION 0x38
#define Q932_IE_FEATURE_INDICATION 0x39
#define Q932_IE_SERVICE_PROFILE_ID 0x3A
#define Q932_IE_ENDPOINT_IDENTIFIER 0x3B
static const value_string q932_str_ie_type[] = {
{ Q932_IE_EXTENDED_FACILITY , "Extended facility" },
{ Q932_IE_FACILITY , "Facility" },
{ Q932_IE_NOTIFICATION_INDICATOR, "Notification indicator" },
{ Q932_IE_INFORMATION_REQUEST, "Information request" },
{ Q932_IE_FEATURE_ACTIVATION , "Feature activation" },
{ Q932_IE_FEATURE_INDICATION , "Feature indication" },
{ Q932_IE_SERVICE_PROFILE_ID , "Service profile identification" },
{ Q932_IE_ENDPOINT_IDENTIFIER, "Endpoint identifier" },
{ 0, NULL}
};
static const value_string str_pp[] = {
{ 0x11 , "Remote Operations Protocol" },
{ 0x12 , "CMIP Protocol" },
{ 0x13 , "ACSE Protocol" },
{ 0x1F , "Networking extensions" },
{ 0, NULL}
};
static const value_string str_nd[] = {
{ 0x00 , "User suspended" },
{ 0x01 , "User resume" },
{ 0x02 , "Bearer service change" },
{ 0x04 , "Call completion delay" },
{ 0x03 , "Discriminator for extension to ASN.1 encoded component" },
{ 0x40 , "Discriminator for extension to ASN.1 encoded component for ISO" },
{ 0x42 , "Conference established" },
{ 0x43 , "Conference disconnected" },
{ 0x44 , "Other party added" },
{ 0x45 , "Isolated" },
{ 0x46 , "Reattached" },
{ 0x47 , "Other party isolated" },
{ 0x48 , "Other party reattached" },
{ 0x49 , "Other party split" },
{ 0x4A , "Other party disconnected" },
{ 0x4B , "Conference floating" },
{ 0x4C , "Conference disconnected, pre-emption" },
{ 0x4F , "Conference floating, served user pre-empted" },
{ 0x60 , "Call is a waiting call" },
{ 0x68 , "Diversion activated" },
{ 0x69 , "call transferred, alerting" },
{ 0x6A , "call transferred, answered" },
{ 0x6E , "reverse charging (whole call)" },
{ 0x6F , "reverse charging (for the rest of the call)" },
{ 0x74 , "service profile update" },
{ 0x79 , "Remote hold" },
{ 0x7A , "Remote retrieval" },
{ 0x7B , "Call is diverting" },
{ 0, NULL}
};
#include "packet-q932-fn.c"
/*--- dissect_q932_facility_ie -------------------------------------------------------*/
static void
dissect_q932_facility_ie(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, int length) {
gint8 appclass;
gboolean pc;
gint32 tag;
guint32 len;
int hoffset, eoffset;
int ie_end;
tvbuff_t *next_tvb;
ie_end = offset + length;
proto_tree_add_item(tree, hf_q932_pp, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
while (offset < ie_end) {
hoffset = offset;
offset = get_ber_identifier(tvb, offset, &appclass, &pc, &tag);
offset = get_ber_length(tvb, offset, &len, NULL);
eoffset = offset + len;
next_tvb = tvb_new_subset_length(tvb, hoffset, eoffset - hoffset);
switch (appclass) {
case BER_CLASS_CON:
switch (tag) {
case 10 : /* Network Facility Extension */
dissect_NetworkFacilityExtension_PDU(next_tvb, pinfo, tree, NULL);
break;
case 18 : /* Network Protocol Profile */
dissect_NetworkProtocolProfile_PDU(next_tvb, pinfo, tree, NULL);
break;
case 11 : /* Interpretation Component */
dissect_InterpretationComponent_PDU(next_tvb, pinfo, tree, NULL);
break;
/* ROSE APDU */
case 1 : /* invoke */
case 2 : /* returnResult */
case 3 : /* returnError */
case 4 : /* reject */
q932_rose_ctx.apdu_depth = 1;
call_dissector_with_data(q932_ros_handle, next_tvb, pinfo, tree, &q932_rose_ctx);
break;
/* DSE APDU */
case 12 : /* begin */
case 14 : /* end */
case 15 : /* continue */
case 17 : /* abort */
offset = dissect_ber_identifier(pinfo, tree, tvb, hoffset, NULL, NULL, NULL);
offset = dissect_ber_length(pinfo, tree, tvb, offset, NULL, NULL);
proto_tree_add_expert(tree, pinfo, &ei_q932_dse_not_supported, tvb, offset, len);
break;
default:
offset = dissect_ber_identifier(pinfo, tree, tvb, hoffset, NULL, NULL, NULL);
offset = dissect_ber_length(pinfo, tree, tvb, offset, NULL, NULL);
proto_tree_add_expert(tree, pinfo, &ei_q932_unknown_component, tvb, offset, len);
}
break;
case BER_CLASS_APP:
switch (tag) {
/* ACSE APDU */
case 0 : /* aarq */
case 1 : /* aare */
case 2 : /* rlrq */
case 3 : /* rlre */
case 4 : /* abrt */
offset = dissect_ber_identifier(pinfo, tree, tvb, hoffset, NULL, NULL, NULL);
offset = dissect_ber_length(pinfo, tree, tvb, offset, NULL, NULL);
proto_tree_add_expert(tree, pinfo, &ei_q932_acse_not_supported, tvb, offset, len);
break;
default:
offset = dissect_ber_identifier(pinfo, tree, tvb, hoffset, NULL, NULL, NULL);
offset = dissect_ber_length(pinfo, tree, tvb, offset, NULL, NULL);
proto_tree_add_expert(tree, pinfo, &ei_q932_unknown_component, tvb, offset, len);
}
break;
default:
offset = dissect_ber_identifier(pinfo, tree, tvb, hoffset, NULL, NULL, NULL);
offset = dissect_ber_length(pinfo, tree, tvb, offset, NULL, NULL);
proto_tree_add_expert(tree, pinfo, &ei_q932_unknown_component, tvb, offset, len);
}
offset = eoffset;
}
}
/*--- dissect_q932_ni_ie -------------------------------------------------------*/
static void
dissect_q932_ni_ie(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, int length) {
int remain = length;
guint8 octet = 0;
guint32 value = 0;
proto_item* ti;
while ((remain > 0) && !(octet & 0x80)) {
octet = tvb_get_guint8(tvb, offset++);
remain--;
value <<= 7;
value |= octet & 0x7F;
}
ti = proto_tree_add_uint(tree, hf_q932_nd, tvb, offset - (length - remain), length - remain, value);
if (remain > 0) {
expert_add_info(pinfo, ti, &ei_q932_asn1_encoded);
}
}
/*--- dissect_q932_ie -------------------------------------------------------*/
static int
dissect_q932_ie(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) {
gint offset;
proto_item *ti;
proto_tree *ie_tree;
guint8 ie_type, ie_len;
offset = 0;
ti = proto_tree_add_item(tree, proto_q932, tvb, offset, -1, ENC_NA);
PROTO_ITEM_SET_HIDDEN(ti);
ie_type = tvb_get_guint8(tvb, offset);
ie_len = tvb_get_guint8(tvb, offset + 1);
ie_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_q932_ie, NULL,
val_to_str(ie_type, VALS(q932_str_ie_type), "unknown (0x%02X)"));
proto_tree_add_item(ie_tree, hf_q932_ie_type, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(ie_tree, hf_q932_ie_len, tvb, offset + 1, 1, ENC_BIG_ENDIAN);
offset += 2;
if (tvb_reported_length_remaining(tvb, offset) <= 0)
return offset;
switch (ie_type) {
case Q932_IE_FACILITY :
dissect_q932_facility_ie(tvb, offset, pinfo, ie_tree, ie_len);
break;
case Q932_IE_NOTIFICATION_INDICATOR :
dissect_q932_ni_ie(tvb, offset, pinfo, ie_tree, ie_len);
break;
default:
if (ie_len > 0) {
proto_tree_add_item(ie_tree, hf_q932_ie_data, tvb, offset, ie_len, ENC_NA);
}
}
return tvb_captured_length(tvb);
}
/*--- dissect_q932_apdu -----------------------------------------------------*/
static int
dissect_q932_apdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) {
return call_dissector(q932_ros_handle, tvb, pinfo, tree);
}
/*--- proto_register_q932 ---------------------------------------------------*/
void proto_register_q932(void) {
/* List of fields */
static hf_register_info hf[] = {
{ &hf_q932_ie_type, { "Type", "q932.ie.type",
FT_UINT8, BASE_HEX, VALS(q932_str_ie_type), 0x0,
"Information Element Type", HFILL }},
{ &hf_q932_ie_len, { "Length", "q932.ie.len",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Information Element Length", HFILL }},
{ &hf_q932_ie_data, { "Data", "q932.ie.data",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_q932_pp, { "Protocol profile", "q932.pp",
FT_UINT8, BASE_HEX, VALS(str_pp), 0x1F,
NULL, HFILL }},
{ &hf_q932_nd, { "Notification description", "q932.nd",
FT_UINT8, BASE_HEX, VALS(str_nd), 0x0,
NULL, HFILL }},
#include "packet-q932-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_q932,
&ett_q932_ie,
#include "packet-q932-ettarr.c"
};
static ei_register_info ei[] = {
{ &ei_q932_dse_not_supported, { "q932.dse_not_supported", PI_UNDECODED, PI_WARN, "DSE APDU (not supported)", EXPFILL }},
{ &ei_q932_acse_not_supported, { "q932.acse_not_supported", PI_UNDECODED, PI_WARN, "ACSE APDU (not supported)", EXPFILL }},
{ &ei_q932_unknown_component, { "q932.unknown_component", PI_UNDECODED, PI_WARN, "Unknown Component", EXPFILL }},
{ &ei_q932_asn1_encoded, { "q932.asn1_encoded", PI_UNDECODED, PI_WARN, "ASN.1 Encoded Data Structure(NOT IMPLEMENTED)", EXPFILL }},
};
module_t *q932_module;
expert_module_t* expert_q932;
static const enum_val_t facility_encoding[] = {
{"Facility as QSIG", "Dissect facility as QSIG", FACILITY_QSIG},
{"Facility as ETSI", "Dissect facility as ETSI", FACILITY_ETSI},
{NULL, NULL, -1}
};
/* Register protocol and dissector */
proto_q932 = proto_register_protocol(PNAME, PSNAME, PFNAME);
register_dissector("q932.apdu", dissect_q932_apdu, proto_q932);
/* Register fields and subtrees */
proto_register_field_array(proto_q932, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_q932 = expert_register_protocol(proto_q932);
expert_register_field_array(expert_q932, ei, array_length(ei));
rose_ctx_init(&q932_rose_ctx);
/* Register dissector tables */
q932_rose_ctx.arg_global_dissector_table = register_dissector_table("q932.ros.global.arg", "Q.932 Operation Argument (global opcode)", proto_q932, FT_STRING, BASE_NONE);
q932_rose_ctx.res_global_dissector_table = register_dissector_table("q932.ros.global.res", "Q.932 Operation Result (global opcode)", proto_q932, FT_STRING, BASE_NONE);
q932_rose_ctx.err_global_dissector_table = register_dissector_table("q932.ros.global.err", "Q.932 Error (global opcode)", proto_q932, FT_STRING, BASE_NONE);
qsig_arg_local_dissector_table = register_dissector_table("q932.ros.local.arg", "Q.932 Operation Argument (local opcode)", proto_q932, FT_UINT32, BASE_HEX);
qsig_res_local_dissector_table = register_dissector_table("q932.ros.local.res", "Q.932 Operation Result (local opcode)", proto_q932, FT_UINT32, BASE_HEX);
qsig_err_local_dissector_table = register_dissector_table("q932.ros.local.err", "Q.932 Error (local opcode)", proto_q932, FT_UINT32, BASE_HEX);
etsi_arg_local_dissector_table = register_dissector_table("q932.ros.etsi.local.arg", "Q.932 ETSI Operation Argument (local opcode)", proto_q932, FT_UINT32, BASE_HEX);
etsi_res_local_dissector_table = register_dissector_table("q932.ros.etsi.local.res", "Q.932 ETSI Operation Result (local opcode)", proto_q932, FT_UINT32, BASE_HEX);
etsi_err_local_dissector_table = register_dissector_table("q932.ros.etsi.local.err", "Q.932 ETSI Error (local opcode)", proto_q932, FT_UINT32, BASE_HEX);
q932_module = prefs_register_protocol(proto_q932, proto_reg_handoff_q932);
prefs_register_enum_preference(q932_module, "facility_encoding",
"Type of Facility encoding",
"Type of Facility encoding",
&g_facility_encoding, facility_encoding, FALSE);
}
/*--- proto_reg_handoff_q932 ------------------------------------------------*/
void proto_reg_handoff_q932(void) {
dissector_handle_t q932_ie_handle;
static gboolean q931_prefs_initialized = FALSE;
if (!q931_prefs_initialized) {
q932_ie_handle = create_dissector_handle(dissect_q932_ie, proto_q932);
/* Facility */
dissector_add_uint("q931.ie", (0x00 << 8) | Q932_IE_FACILITY, q932_ie_handle);
/* Notification indicator */
dissector_add_uint("q931.ie", (0x00 << 8) | Q932_IE_NOTIFICATION_INDICATOR, q932_ie_handle);
q932_ros_handle = find_dissector_add_dependency("q932.ros", proto_q932);
}
if(g_facility_encoding == FACILITY_QSIG){
q932_rose_ctx.arg_local_dissector_table = qsig_arg_local_dissector_table;
q932_rose_ctx.res_local_dissector_table = qsig_res_local_dissector_table;
q932_rose_ctx.err_local_dissector_table = qsig_err_local_dissector_table;
}else{
q932_rose_ctx.arg_local_dissector_table = etsi_arg_local_dissector_table;
q932_rose_ctx.res_local_dissector_table = etsi_res_local_dissector_table;
q932_rose_ctx.err_local_dissector_table = etsi_err_local_dissector_table;
}
}
/*---------------------------------------------------------------------------*/
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