Bug Summary

File:builds/wireshark/wireshark/epan/dissectors/packet-mcdata.c
Warning:line 442, column 13
Value stored to 'offset' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name packet-mcdata.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -ffloat16-excess-precision=fast -fbfloat16-excess-precision=fast -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/builds/wireshark/wireshark/build -fcoverage-compilation-dir=/builds/wireshark/wireshark/build -resource-dir /usr/lib/llvm-21/lib/clang/21 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /builds/wireshark/wireshark/epan/dissectors -isystem /builds/wireshark/wireshark/build/epan/dissectors -isystem /usr/include/mit-krb5 -isystem /usr/include/libxml2 -isystem /builds/wireshark/wireshark/epan -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/builds/wireshark/wireshark/= -fmacro-prefix-map=/builds/wireshark/wireshark/build/= -fmacro-prefix-map=../= -Wno-format-nonliteral -std=gnu11 -ferror-limit 19 -fvisibility=hidden -fwrapv -fwrapv-pointer -fstrict-flex-arrays=3 -stack-protector 2 -fstack-clash-protection -fcf-protection=full -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fexceptions -fcolor-diagnostics -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /builds/wireshark/wireshark/sbout/2026-01-27-100401-3623-1 -x c /builds/wireshark/wireshark/epan/dissectors/packet-mcdata.c
1/* packet-mcdata.c
2 * Routines for MCData dissection.
3 * 3GPP TS 24.282 V18.8.0 MCData
4 *
5 * TODO:
6 * Add support for OFF-NETWORK message and notification
7 * Add support for DEFERRED LIST ACCESS messages
8 * Add support for FD NETWORK NOTIFICATION message
9 * Add support for GROUP EMERGENCY ALERT messages
10 * Add support for COMMUNICATION RELEASE message
11 *
12 * Copyright 2026, Stefan Wenk
13 *
14 * SPDX-License-Identifier: GPL-2.0-or-later
15 *
16 */
17
18#include <epan/expert.h>
19#include <epan/packet.h>
20#include <epan/proto.h>
21#include <gmodule.h>
22
23/* Protocol and Field Handles */
24static int proto_mcdata = -1;
25static int hf_mcdata_message_auth;
26static int hf_mcdata_message_protected;
27static int hf_mcdata_message_type;
28static int hf_mcdata_num_payloads;
29static int hf_mcdata_payload_len;
30static int hf_mcdata_payload_cont_type;
31static int hf_mcdata_payload_val_text;
32static int hf_mcdata_payload_val_bytes;
33static int hf_mcdata_status_val;
34static int hf_mcdata_date_time;
35static int hf_mcdata_conv_id;
36static int hf_mcdata_message_id;
37static int hf_mcdata_sds_disposition_req_iei;
38static int hf_mcdata_sds_disposition_req_type;
39static int hf_mcdata_fd_disposition_req_iei;
40static int hf_mcdata_fd_disposition_req_type;
41static int hf_mcdata_mandatory_download_iei;
42static int hf_mcdata_mandatory_download_value;
43static int hf_mcdata_general_iei;
44static int hf_mcdata_in_reply_to_message_id;
45static int hf_mcdata_application_id;
46static int hf_mcdata_sds_disp_not_type;
47static int hf_mcdata_fd_disp_not_type;
48static int hf_mcdata_metadata;
49static int hf_mcdata_ext_app_id_cont_type;
50static int hf_mcdata_ext_app_id_data;
51static int hf_mcdata_user_location;
52static int hf_mcdata_org_name;
53static int hf_mcdata_deffered_fd_sig_payload;
54static int hf_mcdata_user_ID;
55static int hf_mcdata_termination_info_type;
56static int hf_mcdata_ext_response_type_iei;
57static int hf_mcdata_ext_response_type_value;
58static int hf_mcdata_release_response_type_iei;
59static int hf_mcdata_release_response_type_val;
60static int hf_mcdata_notification_type;
61static int hf_mcdata_app_metadata_container;
62static int hf_mcdata_group_id;
63
64static int ett_mcdata = -1;
65
66static expert_field ei_malformed_length;
67
68static ei_register_info expertitems[] = {
69 {&ei_malformed_length, {"mcdata.malformed.length", PI_MALFORMED0x07000000, PI_ERROR0x00800000, "Malformed length", EXPFILL0, ((void*)0), 0, ((void*)0), {0, {((void*)0), ((void*)0), FT_NONE
, BASE_NONE, ((void*)0), 0, ((void*)0), -1, 0, HF_REF_TYPE_NONE
, -1, ((void*)0)}}}},
70};
71
72// Table 15.2.2-1
73static const value_string message_type_vals[] = {
74 { 1, "SDS SIGNALLING PAYLOAD" },
75 { 2, "FD SIGNALLING PAYLOAD" },
76 { 3, "DATA PAYLOAD" },
77 { 5, "SDS NOTIFICATION" },
78 { 6, "FD NOTIFICATION" },
79 { 7, "SDS OFF-NETWORK MESSAGE" },
80 { 8, "SDS OFF-NETWORK NOTIFICATION" },
81 { 9, "FD NETWORK NOTIFICATION" },
82 { 10, "COMMUNICATION RELEASE" },
83 { 11, "DEFERRED LIST ACCESS REQUEST" },
84 { 12, "DEFERRED LIST ACCESS RESPONSE" },
85 { 13, "FD HTTP TERMINATION" },
86 { 17, "GROUP EMERGENCY ALERT" },
87 { 18, "GROUP EMERGENCY ALERT ACK" },
88 { 19, "GROUP EMERGENCY ALERT CANCEL" },
89 { 20, "GROUP EMERGENCY ALERT CANCEL ACK" },
90 { 0, NULL((void*)0) }
91};
92
93//
94static const value_string payload_content_type_vals[] = {
95 { 1, "TEXT" },
96 { 2, "BINARY" },
97 { 3, "HYPERLINKS" },
98 { 4, "FILEURL" },
99 { 5, "LOCATION" },
100 { 6, "ENHANCED STATUS" },
101 { 7, "Value allocated for use in interworking" },
102 { 8, "LOCATION ALTITUDE" },
103 { 9, "LOCATION TIMESTAMP" },
104 { 10, "CODED TEXT" },
105 { 0, NULL((void*)0) }
106};
107
108// Table 15.2.3-1
109static const value_string sds_disposition_req_type_vals[] = {
110 { 1, "DELIVERY" },
111 { 2, "READ" },
112 { 3, "DELIVERY AND READ" },
113 { 0, NULL((void*)0) }
114};
115
116// Table 15.2.4-1
117static const value_string fd_disposition_req_type_vals[] = {
118 { 1, "FILE DOWNLOAD COMPLETED UPDATE" },
119 { 0, NULL((void*)0) }
120};
121
122// Table 15.2.16-1
123static const value_string mand_download_vals[] = {
124 { 1, "MANDATORY DOWNLOAD" },
125 { 0, NULL((void*)0) }
126};
127
128// Table 15.2.24-2
129static const value_string ext_app_id_content_type_vals[] = {
130 { 1, "TEXT" },
131 { 2, "URI" },
132 { 0, NULL((void*)0) }
133};
134
135static const value_string mcdata_general_iei_vals[] = {
136 // TV IEIs
137 { 0x21, "InReplyTo message ID" },
138 { 0x22, "Application ID" },
139 { 0x51, "Sender MCData user ID" },
140 { 0x52, "Deferred FD signalling payload" },
141 { 0x53, "Application metadata container" },
142 // TLV IEIs
143 { 0x78, "Payload" },
144 { 0x79, "Metadata" },
145 { 0x7B, "MCData group ID" },
146 { 0x7C, "Recipient MCData user ID" },
147 { 0x7D, "Extended application ID" },
148 { 0x7E, "User location" },
149 { 0x7F, "Organization name" },
150 { 0, NULL((void*)0) }
151};
152
153static const value_string application_id_value_vals[] = {
154 { 1, "BROADBAND CALLOUT" },
155 { 0, NULL((void*)0) }
156};
157
158// Table 15.2.5-1
159static const value_string sds_disp_not_type_vals[] = {
160 { 1, "UNDELIVERED" },
161 { 2, "DELIVERED" },
162 { 3, "READ" },
163 { 4, "DELIVERED AND READ" },
164 { 5, "DISPOSITION PREVENTED BY SYSTEM" },
165 { 0, NULL((void*)0) }
166};
167
168// Table 15.2.6-1
169static const value_string fd_disp_not_type_vals[] = {
170 { 1, "FILE DOWNLOAD REQUEST ACCEPTED" },
171 { 2, "FILE DOWNLOAD REQUEST REJECTED" },
172 { 3, "FILE DOWNLOAD COMPLETED" },
173 { 4, "FILE DOWNLOAD DEFERRED" },
174 { 0, NULL((void*)0) }
175};
176
177// Table 15.2.22-1
178static const value_string term_info_type_vals[] = {
179 { 1, "TERMINATION REQUEST" },
180 { 2, "TERMINATION RESPONSE" },
181 { 3, "TRANSMISSION STOPPED" },
182 { 4, "INTENT TO RELEASE COMM OVER HTTP" },
183 { 5, "EXTENSION REQUEST FOR COMM OVER HTTP" },
184 { 6, "EXTENSION RESPONSE FOR COMM OVER HTTP" },
185 { 7, "AUTH USER TERMINATION REQUEST FOR COMM OVER HTTP" },
186 { 0, NULL((void*)0) }
187};
188
189// Table 15.2.21-1
190static const value_string ext_respone_type_value_vals[] = {
191 { 1, "ACCEPTED" },
192 { 2, "REJECTED" },
193 { 0, NULL((void*)0) }
194};
195
196// Table 15.2.23-1
197static const value_string rel_respone_type_vals[] = {
198 { 1, "RELEASE SUCCESS" },
199 { 2, "RELEASE FAILED" },
200 { 0, NULL((void*)0) }
201};
202
203// Table 15.2.18-1
204static const value_string notification_type_vals[] = {
205 { 1, "FILE EXPIRED UNAVAILABLE TO DOWNLOAD" },
206 { 2, "FILE DELETED UNAVAILABLE TO DOWNLOAD" },
207 { 0, NULL((void*)0) }
208};
209
210
211static unsigned dissect_payload(unsigned offset, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
212 unsigned len = tvb_get_uint16(tvb, offset, ENC_BIG_ENDIAN0x00000000);
213 proto_tree_add_item(tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000);
214 if (tvb_reported_length_remaining(tvb, offset) < (unsigned) len) {
215 expert_add_info(pinfo, tree, &ei_malformed_length);
216 return len;
217 }
218 offset += 2;
219 proto_tree_add_item(tree, hf_mcdata_payload_cont_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
220 uint8_t payload_cont_type = tvb_get_uint8(tvb, offset);
221 offset += 1;
222 switch (payload_cont_type) {
223 case 1: // TEXT
224 case 3: // HYPERLINKS
225 case 4: // FILEURL
226 case 10: // CODED TEXT
227 proto_tree_add_item(tree, hf_mcdata_payload_val_text, tvb, offset, len - 1, ENC_UTF_80x00000002);
228 break;
229 case 6: // ENHANCED STATUS
230 proto_tree_add_item(tree, hf_mcdata_status_val, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000);
231 break;
232 case 7: // Value allocated for use in interworking
233 //Todo: Usage of this value is described in 3GPP TS 29.582
234 proto_tree_add_item(tree, hf_mcdata_payload_val_bytes, tvb, offset, len - 1, ENC_NA0x00000000);
235 break;
236 case 8: // LOCATION ALTITUDE
237 //Todo: The length of the location altitude payload content is 2 bytes coded as in clause 6.3 in 3GPP TS 23.032
238 proto_tree_add_item(tree, hf_mcdata_payload_val_bytes, tvb, offset, len - 1, ENC_NA0x00000000);
239 break;
240 case 9: // LOCATION TIMESTAMP
241 //Todo: The length of location timestamp is contained as a binary value in the first octet of the payload
242 proto_tree_add_item(tree, hf_mcdata_payload_val_bytes, tvb, offset, len - 1, ENC_NA0x00000000);
243 break;
244 default:
245 proto_tree_add_item(tree, hf_mcdata_payload_val_bytes, tvb, offset, len - 1, ENC_NA0x00000000);
246 break;
247 }
248 return len + 2;
249}
250
251static int dissect_signalling_payload(uint8_t message_type, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, unsigned decoded_len ) {
252 unsigned offset = 0;
253
254 proto_tree_add_item(tree, hf_mcdata_message_auth, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
255 proto_tree_add_item(tree, hf_mcdata_message_protected, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
256 proto_tree_add_item(tree, hf_mcdata_message_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
257 offset += 1;
258 if (message_type == 5){ // SDS NOTIFICATION
259 proto_tree_add_item(tree, hf_mcdata_sds_disp_not_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
260 offset += 1;
261 }
262 if (message_type == 6) { // FD NOTIFICATION
263 proto_tree_add_item(tree, hf_mcdata_fd_disp_not_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
264 offset += 1;
265 }
266 if (message_type == 9) { // FD NETWORK NOTIFICATION
267 proto_tree_add_item(tree, hf_mcdata_notification_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
268 offset += 1;
269 }
270 if (message_type !=13 ) { // FD HTTP TERMINATION
271 proto_tree_add_item(tree, hf_mcdata_date_time, tvb, offset, 5, ENC_TIME_SECS0x00000012|ENC_BIG_ENDIAN0x00000000);
272 offset += 5;
273 }
274 proto_tree_add_item(tree, hf_mcdata_conv_id, tvb, offset, FT_GUID_LEN16, ENC_BIG_ENDIAN0x00000000);
275 offset += FT_GUID_LEN16;
276 proto_tree_add_item(tree, hf_mcdata_message_id, tvb, offset, FT_GUID_LEN16, ENC_BIG_ENDIAN0x00000000);
277 offset += FT_GUID_LEN16;
278 if (message_type ==13 ) { // FD HTTP TERMINATION
279 proto_tree_add_item(tree, hf_mcdata_termination_info_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
280 offset += 1;
281 }
282
283 while (offset < decoded_len) {
284 unsigned iei = tvb_get_uint8(tvb, offset);
285 if ((iei & 0xF0) == 0x80) { // SDS disposition request type
286 proto_tree_add_item(tree, hf_mcdata_sds_disposition_req_iei, tvb, offset, 1, ENC_NA0x00000000);
287 proto_tree_add_item(tree, hf_mcdata_sds_disposition_req_type, tvb, offset, 1, ENC_NA0x00000000);
288 offset += 1;
289 }
290 else if ((iei & 0xF0) == 0x90) { // FD disposition request type
291 proto_tree_add_item(tree, hf_mcdata_fd_disposition_req_iei, tvb, offset, 1, ENC_NA0x00000000);
292 proto_tree_add_item(tree, hf_mcdata_fd_disposition_req_type, tvb, offset, 1, ENC_NA0x00000000);
293 offset += 1;
294 }
295 else if ((iei & 0xF0) == 0xA0) { // Mandatory download
296 proto_tree_add_item(tree, hf_mcdata_mandatory_download_iei, tvb, offset, 1, ENC_NA0x00000000);
297 proto_tree_add_item(tree, hf_mcdata_mandatory_download_value, tvb, offset, 1, ENC_NA0x00000000);
298 offset += 1;
299 }
300 else if ((iei & 0xF0) == 0xC0) { // Extension Response Type
301 proto_tree_add_item(tree, hf_mcdata_ext_response_type_iei, tvb, offset, 1, ENC_NA0x00000000);
302 proto_tree_add_item(tree, hf_mcdata_ext_response_type_value, tvb, offset, 1, ENC_NA0x00000000);
303 offset += 1;
304 }
305 else if ((iei & 0xF0) == 0xD0) { // Release Response Type
306 proto_tree_add_item(tree, hf_mcdata_release_response_type_iei, tvb, offset, 1, ENC_NA0x00000000);
307 proto_tree_add_item(tree, hf_mcdata_release_response_type_val, tvb, offset, 1, ENC_NA0x00000000);
308 offset += 1;
309 }
310 else {
311 proto_tree_add_item(tree, hf_mcdata_general_iei, tvb, offset, 1, ENC_NA0x00000000);
312 offset += 1;
313 uint16_t len;
314 switch (iei) {
315 case 0x21: { // InReplyTo message ID
316 proto_tree_add_item(tree, hf_mcdata_in_reply_to_message_id, tvb, offset, FT_GUID_LEN16, ENC_BIG_ENDIAN0x00000000);
317 offset += FT_GUID_LEN16;
318 break;
319 }
320 case 0x22: { // Application ID
321 proto_tree_add_item(tree, hf_mcdata_application_id, tvb, offset, 1, ENC_NA0x00000000);
322 offset += 1;
323 break;
324 }
325 case 0x51: { // Sender MCData user ID
326 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len) ;
327 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
328 expert_add_info(pinfo, tree, &ei_malformed_length);
329 return len;
330 }
331 proto_tree_add_item(tree, hf_mcdata_user_ID, tvb, offset + 2, len , ENC_UTF_80x00000002);
332 offset += len + 2;
333 break;
334 }
335 case 0x52: { // Deferred FD signalling payload
336 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
337 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
338 expert_add_info(pinfo, tree, &ei_malformed_length);
339 return len;
340 }
341 proto_tree_add_item(tree, hf_mcdata_deffered_fd_sig_payload, tvb, offset + 2, len , ENC_NA0x00000000);
342 offset += len + 2;
343 break;
344 }
345 case 0x53: { // Application metadata container
346 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
347 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
348 expert_add_info(pinfo, tree, &ei_malformed_length);
349 return len;
350 }
351 proto_tree_add_item(tree, hf_mcdata_app_metadata_container, tvb, offset + 2, len , ENC_UTF_80x00000002);
352 offset += len + 2;
353 break;
354 }
355 case 0x78: { // Payload
356 offset += dissect_payload(offset, tvb, pinfo, tree);
357 break;
358 }
359 case 0x79: { // Metadata
360 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
361 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
362 expert_add_info(pinfo, tree, &ei_malformed_length);
363 return len;
364 }
365 proto_tree_add_item(tree, hf_mcdata_metadata, tvb, offset + 2, len , ENC_UTF_80x00000002);
366 offset += len + 2;
367 break;
368 }
369 case 0x7B: { // MCData group ID
370 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
371 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
372 expert_add_info(pinfo, tree, &ei_malformed_length);
373 return len;
374 }
375 proto_tree_add_item(tree, hf_mcdata_group_id, tvb, offset + 2, len , ENC_NA0x00000000);
376 offset += len + 2;
377 break;
378 }
379 case 0x7C: { // Recipient MCData user ID
380 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
381 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
382 expert_add_info(pinfo, tree, &ei_malformed_length);
383 return len;
384 }
385 proto_tree_add_item(tree, hf_mcdata_user_ID, tvb, offset + 2, len , ENC_UTF_80x00000002);
386 offset += len + 2;
387 break;
388 }
389 case 0x7D: { // Extended application ID
390 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
391 if (tvb_reported_length_remaining(tvb, offset + 3) < (unsigned) len) {
392 expert_add_info(pinfo, tree, &ei_malformed_length);
393 return len;
394 }
395 proto_tree_add_item(tree, hf_mcdata_ext_app_id_cont_type, tvb, offset + 2, 1, ENC_BIG_ENDIAN0x00000000);
396 proto_tree_add_item(tree, hf_mcdata_ext_app_id_data, tvb, offset + 3, len - 1, ENC_UTF_80x00000002);
397 offset += len + 3;
398 break;
399 }
400 case 0x7E: { // User location
401 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
402 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
403 expert_add_info(pinfo, tree, &ei_malformed_length);
404 return len;
405 }
406 // Todo: The User location information element contains the LocationInfo structure defined in clause 7.4 of 3GPP TS 29.199-09
407 proto_tree_add_item(tree, hf_mcdata_user_location, tvb, offset + 2, len , ENC_NA0x00000000);
408 offset += len + 2;
409 break;
410 }
411 case 0x7F: { // Organization name
412 proto_tree_add_item_ret_uint16 (tree, hf_mcdata_payload_len, tvb, offset, 2, ENC_BIG_ENDIAN0x00000000, &len);
413 if (tvb_reported_length_remaining(tvb, offset + 2) < (unsigned) len) {
414 expert_add_info(pinfo, tree, &ei_malformed_length);
415 return len;
416 }
417 proto_tree_add_item(tree, hf_mcdata_org_name, tvb, offset + 2, len , ENC_UTF_80x00000002);
418 offset += len + 2;
419 break;
420 }
421 }
422 }
423
424 }
425
426 return offset;
427}
428
429/* Dissector Implementation */
430static int dissect_mcdata(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U___attribute__((unused))) {
431 unsigned offset = 0;
432 unsigned decoded_len = tvb_captured_length(tvb);
433 uint8_t message_type = tvb_get_uint8(tvb, offset) & 0x3F;
434
435 add_new_data_source(pinfo, tvb, "MCData");
436 proto_item *ti = proto_tree_add_item(tree, proto_mcdata, tvb, 0, -1, ENC_NA0x00000000);
437 proto_tree *mcdata_tree = proto_item_add_subtree(ti, ett_mcdata);
438
439 switch (message_type) {
440 case 1: // SDS SIGNALLING PAYLOAD
441 col_append_str(pinfo->cinfo, COL_INFO, "| SDS Signalling Payload");
442 offset += dissect_signalling_payload(message_type, tvb, pinfo, mcdata_tree, decoded_len);
Value stored to 'offset' is never read
443 break;
444 case 2: // FD SIGNALLING PAYLOAD
445 col_append_str(pinfo->cinfo, COL_INFO, "| FD Signalling Payload");
446 offset += dissect_signalling_payload(message_type, tvb, pinfo, mcdata_tree, decoded_len);
447 break;
448 case 3: // DATA PAYLOAD
449 col_append_str(pinfo->cinfo, COL_INFO, "| Data Payload");
450 proto_tree_add_item(mcdata_tree, hf_mcdata_message_auth, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
451 proto_tree_add_item(mcdata_tree, hf_mcdata_message_protected, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
452 proto_tree_add_item(mcdata_tree, hf_mcdata_message_type, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
453 offset += 1;
454 proto_tree_add_item(mcdata_tree, hf_mcdata_num_payloads, tvb, offset, 1, ENC_BIG_ENDIAN0x00000000);
455 uint8_t num_payload = tvb_get_uint8(tvb, offset);
456 offset += 1;
457 for (uint8_t i=1; i<=num_payload; i++) {
458 proto_tree_add_item(mcdata_tree, hf_mcdata_general_iei, tvb, offset, 1, ENC_NA0x00000000);
459 offset += 1;
460 offset += dissect_payload(offset, tvb, pinfo, mcdata_tree);
461 }
462 break;
463 case 5: // SDS NOTIFICATION
464 col_append_str(pinfo->cinfo, COL_INFO, "| SDS Notification");
465 offset += dissect_signalling_payload(message_type, tvb, pinfo, mcdata_tree, decoded_len);
466 break;
467 case 6: // FD NOTIFICATION
468 col_append_str(pinfo->cinfo, COL_INFO, "| FD Notification");
469 offset += dissect_signalling_payload(message_type, tvb, pinfo, mcdata_tree, decoded_len);
470 break;
471 case 7: // SDS OFF-NETWORK MESSAGE
472 col_append_str(pinfo->cinfo, COL_INFO, "| SDS Off-Network Message");
473 break;
474 case 8: // SDS OFF-NETWORK NOTIFICATION
475 col_append_str(pinfo->cinfo, COL_INFO, "| SDS Off-Network Notification");
476 break;
477 case 9: // FD NETWORK NOTIFICATION
478 col_append_str(pinfo->cinfo, COL_INFO, "| FD Network Notification");
479 offset += dissect_signalling_payload(message_type, tvb, pinfo, mcdata_tree, decoded_len);
480 break;
481 case 10: // COMMUNICATION RELEASE
482 col_append_str(pinfo->cinfo, COL_INFO, "| Communication Release");
483 break;
484 case 11: // DEFERRED LIST ACCESS REQUEST
485 col_append_str(pinfo->cinfo, COL_INFO, "| Deferred list access request");
486 break;
487 case 12: // DEFERRED LIST ACCESS RESPONSE
488 col_append_str(pinfo->cinfo, COL_INFO, "| Deferred list access response");
489 break;
490 case 13: // FD HTTP TERMINATION
491 col_append_str(pinfo->cinfo, COL_INFO, "| FD HTTP termination");
492 offset += dissect_signalling_payload(message_type, tvb, pinfo, mcdata_tree, decoded_len);
493 break;
494 case 17: // GROUP EMERGENCY ALERT
495 col_append_str(pinfo->cinfo, COL_INFO, "| Group emergency alert");
496 break;
497 case 18: // GROUP EMERGENCY ALERT ACK
498 col_append_str(pinfo->cinfo, COL_INFO, "| Group emergency alert ack");
499 break;
500 case 19: // GROUP EMERGENCY ALERT CANCEL
501 col_append_str(pinfo->cinfo, COL_INFO, "| Group emergency alert cancel");
502 break;
503 case 20: // GROUP EMERGENCY ALERT CANCEL ACK
504 col_append_str(pinfo->cinfo, COL_INFO, "| Group emergency alert cancel ack");
505 break;
506 default:
507 col_append_str(pinfo->cinfo, COL_INFO, "| Unknown Message Type");
508 break;
509 }
510
511 return tvb_captured_length(tvb);
512}
513
514/* Registration */
515void proto_register_mcdata(void) {
516 static hf_register_info hf[] = {
517 { &hf_mcdata_message_auth, { "Message authenticated", "mcdata.message.authenticated", FT_BOOLEAN, 8, NULL((void*)0), 0x80, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
518 { &hf_mcdata_message_protected, { "Message protected", "mcdata.message.protected", FT_BOOLEAN, 8, NULL((void*)0), 0x40, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
519 { &hf_mcdata_message_type, { "Message type", "mcdata.message.type", FT_UINT8, BASE_DEC, VALS(message_type_vals)((0 ? (const struct _value_string*)0 : ((message_type_vals)))
), 0x3F, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
520 { &hf_mcdata_num_payloads, { "Number of payloads", "mcdata.pl.num.payloads", FT_UINT8, BASE_DEC, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
521 { &hf_mcdata_payload_len, { "Payload length", "mcdata.pl.payload.len", FT_UINT16, BASE_DEC, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
522 { &hf_mcdata_payload_cont_type, { "Payload content type", "mcdata.pl.payload.content.type", FT_UINT8, BASE_DEC, VALS(payload_content_type_vals)((0 ? (const struct _value_string*)0 : ((payload_content_type_vals
)))), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
523 { &hf_mcdata_payload_val_text, { "Payload text value", "mcdata.pl.payload.text.val", FT_STRING, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
524 { &hf_mcdata_payload_val_bytes, { "Payload value", "mcdata.pl.payload.val", FT_BYTES, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
525 { &hf_mcdata_status_val, { "Enhanced status value", "mcdata.pl.status.val", FT_UINT16, BASE_DEC, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
526 { &hf_mcdata_date_time, { "Date and time", "mcdata.sig.date.and.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL((void*)0), 0x0,NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
527 { &hf_mcdata_conv_id, { "Conversation ID", "mcdata.sig.conv.id", FT_GUID, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
528 { &hf_mcdata_message_id, { "Message ID", "mcdata.sig.message.id", FT_GUID, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
529 { &hf_mcdata_sds_disposition_req_iei, { "SDS disposition request IEI", "mcdata.sig.sds.disp.req.iei", FT_UINT8, BASE_HEX, NULL((void*)0), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
530 { &hf_mcdata_sds_disposition_req_type, { "SDS disposition request type", "mcdata.sig.sds.disp.req.type", FT_UINT8, BASE_DEC, VALS(sds_disposition_req_type_vals)((0 ? (const struct _value_string*)0 : ((sds_disposition_req_type_vals
)))), 0x0F, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
531 { &hf_mcdata_fd_disposition_req_iei, { "FD disposition request IEI", "mcdata.sig.fd.disp.req.iei", FT_UINT8, BASE_HEX, NULL((void*)0), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
532 { &hf_mcdata_fd_disposition_req_type, { "FD disposition request type", "mcdata.sig.fd.disp.req.type", FT_UINT8, BASE_DEC, VALS(fd_disposition_req_type_vals)((0 ? (const struct _value_string*)0 : ((fd_disposition_req_type_vals
)))), 0x0F, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
533 { &hf_mcdata_mandatory_download_iei, { "Mandatory download IEI", "mcdata.sig.mand.download.iei", FT_UINT8, BASE_HEX, NULL((void*)0), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
534 { &hf_mcdata_mandatory_download_value, { "Mandatory download value", "mcdata.sig.mand.download.value", FT_UINT8, BASE_DEC, VALS(mand_download_vals)((0 ? (const struct _value_string*)0 : ((mand_download_vals))
)), 0x0F, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
535 { &hf_mcdata_general_iei, { "MCData general IEI", "mcdata.general.iei", FT_UINT8, BASE_HEX, VALS(mcdata_general_iei_vals)((0 ? (const struct _value_string*)0 : ((mcdata_general_iei_vals
)))), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
536 { &hf_mcdata_in_reply_to_message_id, { "In reply to message ID", "mcdata.sig.in.reply.to.message.id", FT_GUID, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
537 { &hf_mcdata_application_id, { "Application ID value", "mcdata.sig.appl.id.value", FT_UINT8, BASE_DEC, VALS(application_id_value_vals)((0 ? (const struct _value_string*)0 : ((application_id_value_vals
)))), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
538 { &hf_mcdata_sds_disp_not_type, { "SDS disposition notification type", "mcdata.sig.sds.disp.not.type", FT_UINT8, BASE_DEC, VALS(sds_disp_not_type_vals)((0 ? (const struct _value_string*)0 : ((sds_disp_not_type_vals
)))), 0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
539 { &hf_mcdata_fd_disp_not_type, { "FD disposition notification type", "mcdata.sig.fd.disp.not.type", FT_UINT8, BASE_DEC, VALS(fd_disp_not_type_vals)((0 ? (const struct _value_string*)0 : ((fd_disp_not_type_vals
)))), 0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
540 { &hf_mcdata_metadata, { "Metadata", "mcdata.sig.metadata", FT_STRING, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
541 { &hf_mcdata_ext_app_id_cont_type, { "Extended application id content type", "mcdata.sig.ext.app.id.cont.type", FT_UINT8, BASE_HEX, VALS(ext_app_id_content_type_vals)((0 ? (const struct _value_string*)0 : ((ext_app_id_content_type_vals
)))), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
542 { &hf_mcdata_ext_app_id_data, { "Extended application id data", "mcdata.sig.ext.app.id.data", FT_STRING, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
543 { &hf_mcdata_user_location, { "User location", "mcdata.sig.user.location", FT_BYTES, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
544 { &hf_mcdata_org_name, { "Organization name", "mcdata.org.name", FT_STRING, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
545 { &hf_mcdata_deffered_fd_sig_payload, { "Deferred FD signalling payload", "mcdata.sig.def.fd.sig.payload", FT_BYTES, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
546 { &hf_mcdata_user_ID, { "MCData user ID", "mcdata.sig.user.id", FT_STRING, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
547 { &hf_mcdata_termination_info_type, { "Termination information type", "mcdata.sig.term.info.type", FT_UINT8, BASE_DEC, VALS(term_info_type_vals)((0 ? (const struct _value_string*)0 : ((term_info_type_vals)
))), 0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
548 { &hf_mcdata_ext_response_type_iei, { "Extension response type IEI", "mcdata.sig.ext.resp.type.iei", FT_UINT8, BASE_HEX, NULL((void*)0), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
549 { &hf_mcdata_ext_response_type_value, { "Extension response type value", "mcdata.sig.ext.resp.type.value", FT_UINT8, BASE_HEX, VALS(ext_respone_type_value_vals)((0 ? (const struct _value_string*)0 : ((ext_respone_type_value_vals
)))), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
550 { &hf_mcdata_release_response_type_iei, { "Release response type IEI", "mcdata.sig.rel.resp.type.iei", FT_UINT8, BASE_HEX, NULL((void*)0), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
551 { &hf_mcdata_release_response_type_val, { "Release response type value", "mcdata.sig.rel.resp.type.value", FT_UINT8, BASE_HEX, VALS(rel_respone_type_vals)((0 ? (const struct _value_string*)0 : ((rel_respone_type_vals
)))), 0xF0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
552 { &hf_mcdata_notification_type, { "Notification type", "mcdata.sig.notification.type", FT_UINT8, BASE_DEC, VALS(notification_type_vals)((0 ? (const struct _value_string*)0 : ((notification_type_vals
)))), 0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
553 { &hf_mcdata_app_metadata_container, { "Application metadata container", "mcdata.sig.metadata.container", FT_STRING, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
554 { &hf_mcdata_group_id, { "MCData group id", "mcdata.sig.mcdata.group.id", FT_BYTES, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
555 };
556 static int *ett[] = { &ett_mcdata };
557
558 proto_mcdata = proto_register_protocol("Mission critical data", "MCData", "mcdata");
559 proto_register_field_array(proto_mcdata, hf, array_length(hf)(sizeof (hf) / sizeof (hf)[0]));
560 proto_register_subtree_array(ett, array_length(ett)(sizeof (ett) / sizeof (ett)[0]));
561 expert_module_t *expert = expert_register_protocol(proto_mcdata);
562 expert_register_field_array(expert, expertitems, array_length(expertitems)(sizeof (expertitems) / sizeof (expertitems)[0]));
563
564}
565
566void proto_reg_handoff_mcdata(void) {
567 static dissector_handle_t mcdata_handle;
568 mcdata_handle = create_dissector_handle(dissect_mcdata, proto_mcdata);
569 dissector_add_string("media_type", "application/vnd.3gpp.mcdata-payload", mcdata_handle);
570 dissector_add_string("media_type", "application/vnd.3gpp.mcdata-signalling", mcdata_handle);
571 // The protocol never appears on top of UDP in the wild, but we allow it for testing purposes using "Decode As":
572 dissector_add_for_decode_as_with_preference("udp.port", mcdata_handle);
573}