### Bug Summary

File: | builds/wireshark/wireshark/epan/reassemble.c
Warning: | line 1909, column 12 Potential leak of memory pointed to by 'data'

### 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 reassemble.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 -isystem /builds/wireshark/wireshark/build/epan -isystem /usr/include/mit-krb5 -isystem /usr/include/libxml2 -isystem /usr/include/lua5.4 -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -D epan_EXPORTS -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -I /builds/wireshark/wireshark/wiretap -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/2026-01-25-100340-3605-1 -x c /builds/wireshark/wireshark/epan/reassemble.c

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1 | /* reassemble.c
2 | * Routines for {fragment,segment} reassembly
3 | *
4 | * Wireshark - Network traffic analyzer
5 | * By Gerald Combs <gerald@wireshark.org>
6 | * Copyright 1998 Gerald Combs
7 | *
8 | * SPDX-License-Identifier: GPL-2.0-or-later
9 | */
10 |
11 | #include "config.h"
12 |
13 | #include <string.h>
14 |
15 | #include <epan/packet.h>
16 | #include <epan/exceptions.h>
17 | #include <epan/reassemble.h>
18 | #include <epan/tvbuff-int.h>
19 |
20 | #include <wsutil/str_util.h>
21 | #include <wsutil/ws_assert.h>
22 |
23 | /*
24 | * Functions for reassembly tables where the endpoint addresses, and a
25 | * fragment ID, are used as the key.
26 | */
27 | typedef struct _fragment_addresses_key {
28 | address src;
29 | address dst;
30 | uint32_t id;
31 | } fragment_addresses_key;
32 |
33 | GList* reassembly_table_list;
34 |
35 | static unsigned
36 | fragment_addresses_hash(const void *k)
37 | {
38 | const fragment_addresses_key* key = (const fragment_addresses_key*) k;
39 | unsigned hash_val;
40 | /*
41 | int i;
42 | */
43 |
44 | hash_val = 0;
45 |
46 | /* More than likely: in most captures src and dst addresses are the
47 | same, and would hash the same.
48 | We only use id as the hash as an optimization.
49 |
50 | for (i = 0; i < key->src.len; i++)
51 | hash_val += key->src.data[i];
52 | for (i = 0; i < key->dst.len; i++)
53 | hash_val += key->dst.data[i];
54 | */
55 |
56 | hash_val += key->id;
57 |
58 | return hash_val;
59 | }
60 |
61 | static int
62 | fragment_addresses_equal(const void *k1, const void *k2)
63 | {
64 | const fragment_addresses_key* key1 = (const fragment_addresses_key*) k1;
65 | const fragment_addresses_key* key2 = (const fragment_addresses_key*) k2;
66 |
67 | /*
68 | * key.id is the first item to compare since it's the item most
69 | * likely to differ between sessions, thus short-circuiting
70 | * the comparison of addresses.
71 | */
72 | return (key1->id == key2->id) &&
73 | (addresses_equal(&key1->src, &key2->src)) &&
74 | (addresses_equal(&key1->dst, &key2->dst));
75 | }
76 |
77 | /*
78 | * Create a fragment key for temporary use; it can point to non-
79 | * persistent data, and so must only be used to look up and
80 | * delete entries, not to add them.
81 | */
82 | static void *
83 | fragment_addresses_temporary_key(const packet_info *pinfo, const uint32_t id,
84 | const void *data _U___attribute__((unused)))
85 | {
86 | fragment_addresses_key *key = g_slice_new(fragment_addresses_key)((fragment_addresses_key*) g_slice_alloc (sizeof (fragment_addresses_key )));
87 |
88 | /*
89 | * Do a shallow copy of the addresses.
90 | */
91 | copy_address_shallow(&key->src, &pinfo->src);
92 | copy_address_shallow(&key->dst, &pinfo->dst);
93 | key->id = id;
94 |
95 | return (void *)key;
96 | }
97 |
98 | /*
99 | * Create a fragment key for permanent use; it must point to persistent
100 | * data, so that it can be used to add entries.
101 | */
102 | static void *
103 | fragment_addresses_persistent_key(const packet_info *pinfo, const uint32_t id,
104 | const void *data _U___attribute__((unused)))
105 | {
106 | fragment_addresses_key *key = g_slice_new(fragment_addresses_key)((fragment_addresses_key*) g_slice_alloc (sizeof (fragment_addresses_key )));
107 |
108 | /*
109 | * Do a deep copy of the addresses.
110 | */
111 | copy_address(&key->src, &pinfo->src);
112 | copy_address(&key->dst, &pinfo->dst);
113 | key->id = id;
114 |
115 | return (void *)key;
116 | }
117 |
118 | static void
119 | fragment_addresses_free_temporary_key(void *ptr)
120 | {
121 | fragment_addresses_key *key = (fragment_addresses_key *)ptr;
122 | g_slice_free(fragment_addresses_key, key)do { if (1) g_slice_free1 (sizeof (fragment_addresses_key), ( key)); else (void) ((fragment_addresses_key*) 0 == (key)); } while (0);
123 | }
124 |
125 | static void
126 | fragment_addresses_free_persistent_key(void *ptr)
127 | {
128 | fragment_addresses_key *key = (fragment_addresses_key *)ptr;
129 |
130 | if(key){
131 | /*
132 | * Free up the copies of the addresses from the old key.
133 | */
134 | free_address(&key->src);
135 | free_address(&key->dst);
136 |
137 | g_slice_free(fragment_addresses_key, key)do { if (1) g_slice_free1 (sizeof (fragment_addresses_key), ( key)); else (void) ((fragment_addresses_key*) 0 == (key)); } while (0);
138 | }
139 | }
140 |
141 | const reassembly_table_functions
142 | addresses_reassembly_table_functions = {
143 | fragment_addresses_hash,
144 | fragment_addresses_equal,
145 | fragment_addresses_temporary_key,
146 | fragment_addresses_persistent_key,
147 | fragment_addresses_free_temporary_key,
148 | fragment_addresses_free_persistent_key
149 | };
150 |
151 | /*
152 | * Functions for reassembly tables where the endpoint addresses and ports,
153 | * and a fragment ID, are used as the key.
154 | */
155 | typedef struct _fragment_addresses_ports_key {
156 | address src_addr;
157 | address dst_addr;
158 | uint32_t src_port;
159 | uint32_t dst_port;
160 | uint32_t id;
161 | } fragment_addresses_ports_key;
162 |
163 | static unsigned
164 | fragment_addresses_ports_hash(const void *k)
165 | {
166 | const fragment_addresses_ports_key* key = (const fragment_addresses_ports_key*) k;
167 | unsigned hash_val;
168 | /*
169 | int i;
170 | */
171 |
172 | hash_val = 0;
173 |
174 | /* More than likely: in most captures src and dst addresses and ports
175 | are the same, and would hash the same.
176 | We only use id as the hash as an optimization.
177 |
178 | for (i = 0; i < key->src.len; i++)
179 | hash_val += key->src_addr.data[i];
180 | for (i = 0; i < key->dst.len; i++)
181 | hash_val += key->dst_addr.data[i];
182 | hash_val += key->src_port;
183 | hash_val += key->dst_port;
184 | */
185 |
186 | hash_val += key->id;
187 |
188 | return hash_val;
189 | }
190 |
191 | static int
192 | fragment_addresses_ports_equal(const void *k1, const void *k2)
193 | {
194 | const fragment_addresses_ports_key* key1 = (const fragment_addresses_ports_key*) k1;
195 | const fragment_addresses_ports_key* key2 = (const fragment_addresses_ports_key*) k2;
196 |
197 | /*
198 | * key.id is the first item to compare since it's the item most
199 | * likely to differ between sessions, thus short-circuiting
200 | * the comparison of addresses and ports.
201 | */
202 | return (key1->id == key2->id) &&
203 | (addresses_equal(&key1->src_addr, &key2->src_addr)) &&
204 | (addresses_equal(&key1->dst_addr, &key2->dst_addr)) &&
205 | (key1->src_port == key2->src_port) &&
206 | (key1->dst_port == key2->dst_port);
207 | }
208 |
209 | /*
210 | * Create a fragment key for temporary use; it can point to non-
211 | * persistent data, and so must only be used to look up and
212 | * delete entries, not to add them.
213 | */
214 | static void *
215 | fragment_addresses_ports_temporary_key(const packet_info *pinfo, const uint32_t id,
216 | const void *data _U___attribute__((unused)))
217 | {
218 | fragment_addresses_ports_key *key = g_slice_new(fragment_addresses_ports_key)((fragment_addresses_ports_key*) g_slice_alloc (sizeof (fragment_addresses_ports_key )));
219 |
220 | /*
221 | * Do a shallow copy of the addresses.
222 | */
223 | copy_address_shallow(&key->src_addr, &pinfo->src);
224 | copy_address_shallow(&key->dst_addr, &pinfo->dst);
225 | key->src_port = pinfo->srcport;
226 | key->dst_port = pinfo->destport;
227 | key->id = id;
228 |
229 | return (void *)key;
230 | }
231 |
232 | /*
233 | * Create a fragment key for permanent use; it must point to persistent
234 | * data, so that it can be used to add entries.
235 | */
236 | static void *
237 | fragment_addresses_ports_persistent_key(const packet_info *pinfo,
238 | const uint32_t id, const void *data _U___attribute__((unused)))
239 | {
240 | fragment_addresses_ports_key *key = g_slice_new(fragment_addresses_ports_key)((fragment_addresses_ports_key*) g_slice_alloc (sizeof (fragment_addresses_ports_key )));
241 |
242 | /*
243 | * Do a deep copy of the addresses.
244 | */
245 | copy_address(&key->src_addr, &pinfo->src);
246 | copy_address(&key->dst_addr, &pinfo->dst);
247 | key->src_port = pinfo->srcport;
248 | key->dst_port = pinfo->destport;
249 | key->id = id;
250 |
251 | return (void *)key;
252 | }
253 |
254 | static void
255 | fragment_addresses_ports_free_temporary_key(void *ptr)
256 | {
257 | fragment_addresses_ports_key *key = (fragment_addresses_ports_key *)ptr;
258 | g_slice_free(fragment_addresses_ports_key, key)do { if (1) g_slice_free1 (sizeof (fragment_addresses_ports_key ), (key)); else (void) ((fragment_addresses_ports_key*) 0 == ( key)); } while (0);
259 | }
260 |
261 | static void
262 | fragment_addresses_ports_free_persistent_key(void *ptr)
263 | {
264 | fragment_addresses_ports_key *key = (fragment_addresses_ports_key *)ptr;
265 |
266 | if(key){
267 | /*
268 | * Free up the copies of the addresses from the old key.
269 | */
270 | free_address(&key->src_addr);
271 | free_address(&key->dst_addr);
272 |
273 | g_slice_free(fragment_addresses_ports_key, key)do { if (1) g_slice_free1 (sizeof (fragment_addresses_ports_key ), (key)); else (void) ((fragment_addresses_ports_key*) 0 == ( key)); } while (0);
274 | }
275 | }
276 |
277 | const reassembly_table_functions
278 | addresses_ports_reassembly_table_functions = {
279 | fragment_addresses_ports_hash,
280 | fragment_addresses_ports_equal,
281 | fragment_addresses_ports_temporary_key,
282 | fragment_addresses_ports_persistent_key,
283 | fragment_addresses_ports_free_temporary_key,
284 | fragment_addresses_ports_free_persistent_key
285 | };
286 |
287 | typedef struct _reassembled_key {
288 | uint32_t id;
289 | uint32_t frame;
290 | } reassembled_key;
291 |
292 | static int
293 | reassembled_equal(const void *k1, const void *k2)
294 | {
295 | const reassembled_key* key1 = (const reassembled_key*) k1;
296 | const reassembled_key* key2 = (const reassembled_key*) k2;
297 |
298 | /*
299 | * We assume that the frame numbers are unlikely to be equal,
300 | * so we check them first.
301 | */
302 | return key1->frame == key2->frame && key1->id == key2->id;
303 | }
304 |
305 | static unsigned
306 | reassembled_hash(const void *k)
307 | {
308 | const reassembled_key* key = (const reassembled_key*) k;
309 |
310 | return key->frame;
311 | }
312 |
313 | static void
314 | reassembled_key_free(void *ptr)
315 | {
316 | g_slice_free(reassembled_key, (reassembled_key *)ptr)do { if (1) g_slice_free1 (sizeof (reassembled_key), ((reassembled_key *)ptr)); else (void) ((reassembled_key*) 0 == ((reassembled_key *)ptr)); } while (0);
317 | }
318 |
319 | /*
320 | * For a fragment hash table entry, free the associated fragments.
321 | * The entry value (fd_chain) is freed herein and the entry is freed
322 | * when the key freeing routine is called (as a consequence of returning
323 | * true from this function).
324 | */
325 | static gboolean
326 | free_all_fragments(void *key_arg _U___attribute__((unused)), void *value, void *user_data _U___attribute__((unused)))
327 | {
328 | fragment_head *fd_head;
329 | fragment_item *fd_i = NULL((void*)0), *tmp_fd;
330 |
331 | /* g_hash_table_new_full() was used to supply a function
332 | * to free the key and anything to which it points
333 | */
334 | fd_head = (fragment_head *)value;
335 | if (fd_head != NULL((void*)0)) {
336 | fd_i = fd_head->next;
337 | if(fd_head->tvb_data && !(fd_head->flags&FD_SUBSET_TVB0x0020))
338 | tvb_free(fd_head->tvb_data);
339 | g_slice_free(fragment_head, fd_head)do { if (1) g_slice_free1 (sizeof (fragment_head), (fd_head)) ; else (void) ((fragment_head*) 0 == (fd_head)); } while (0);
340 | }
341 |
342 | for (; fd_i != NULL((void*)0); fd_i = tmp_fd) {
343 | tmp_fd=fd_i->next;
344 |
345 | if(fd_i->tvb_data && !(fd_i->flags&FD_SUBSET_TVB0x0020))
346 | tvb_free(fd_i->tvb_data);
347 | g_slice_free(fragment_item, fd_i)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd_i)); else (void) ((fragment_item*) 0 == (fd_i)); } while (0);
348 | }
349 |
350 | return TRUE(!(0));
351 | }
352 |
353 | /* ------------------------- */
354 | static fragment_head *new_head(const uint32_t flags)
355 | {
356 | fragment_head *fd_head;
357 | /* If head/first structure in list only holds no other data than
358 | * 'datalen' then we don't have to change the head of the list
359 | * even if we want to keep it sorted
360 | */
361 | fd_head=g_slice_new0(fragment_head)((fragment_head*) g_slice_alloc0 (sizeof (fragment_head)));
362 |
363 | fd_head->flags=flags;
364 | return fd_head;
365 | }
366 |
367 | /*
368 | * For a reassembled-packet hash table entry, free the fragment data
369 | * to which the value refers. (The key is freed by reassembled_key_free.)
370 | */
371 | static void
372 | free_fd_head(fragment_head *fd_head)
373 | {
374 | fragment_item *fd_i, *tmp;
375 |
376 | if (fd_head->flags & FD_SUBSET_TVB0x0020)
377 | fd_head->tvb_data = NULL((void*)0);
378 | if (fd_head->tvb_data)
379 | tvb_free(fd_head->tvb_data);
380 | for (fd_i = fd_head->next; fd_i; fd_i = tmp) {
381 | tmp = fd_i->next;
382 | if (fd_i->flags & FD_SUBSET_TVB0x0020)
383 | fd_i->tvb_data = NULL((void*)0);
384 | if (fd_i->tvb_data) {
385 | tvb_free(fd_i->tvb_data);
386 | }
387 | g_slice_free(fragment_item, fd_i)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd_i)); else (void) ((fragment_item*) 0 == (fd_i)); } while (0);
388 | }
389 | g_slice_free(fragment_head, fd_head)do { if (1) g_slice_free1 (sizeof (fragment_head), (fd_head)) ; else (void) ((fragment_head*) 0 == (fd_head)); } while (0);
390 | }
391 |
392 | static void
393 | unref_fd_head(void *data)
394 | {
395 | fragment_head *fd_head = (fragment_head *) data;
396 | fd_head->ref_count--;
397 |
398 | if (fd_head->ref_count == 0) {
399 | free_fd_head(fd_head);
400 | }
401 | }
402 |
403 | static void
404 | reassembled_table_insert(GHashTable *reassembled_table, reassembled_key *key, fragment_head *fd_head)
405 | {
406 | fragment_head *old_fd_head;
407 | fd_head->ref_count++;
408 | if ((old_fd_head = g_hash_table_lookup(reassembled_table, key)) != NULL((void*)0)) {
409 | if (old_fd_head->ref_count == 1) {
410 | /* We're replacing the last entry in the reassembled
411 | * table for an old reassembly. Does it have a tvb?
412 | * We might still be using that tvb's memory for an
413 | * address via set_address_tvb(). (See #19094.)
414 | */
415 | if (old_fd_head->tvb_data && fd_head->tvb_data) {
416 | /* Free it when the new tvb is freed */
417 | tvb_set_child_real_data_tvbuff(fd_head->tvb_data, old_fd_head->tvb_data);
418 | }
419 | /* XXX: Set the old data to NULL regardless. If we
420 | * have old data but not new data, that is odd (we're
421 | * replacing a reassembly with tvb data with something
422 | * with no tvb data, possibly because a zero length or
423 | * null tvb was passed into a defragment function,
424 | * which is a dissector bug.)
425 | * This leaks the tvb data if we couldn't add it to
426 | * a new tvb's chain, but we might not be able to free
427 | * it yet if set_address_tvb() was used.
428 | */
429 | old_fd_head->tvb_data = NULL((void*)0);
430 | }
431 | }
432 | g_hash_table_insert(reassembled_table, key, fd_head);
433 | }
434 |
435 | typedef struct register_reassembly_table {
436 | reassembly_table *table;
437 | const reassembly_table_functions *funcs;
438 | } register_reassembly_table_t;
439 |
440 | /*
441 | * Register a reassembly table.
442 | */
443 | void
444 | reassembly_table_register(reassembly_table *table,
445 | const reassembly_table_functions *funcs)
446 | {
447 | register_reassembly_table_t* reg_table;
448 |
449 | DISSECTOR_ASSERT(table)((void) ((table) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 449, "table"))));
450 | DISSECTOR_ASSERT(funcs)((void) ((funcs) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 450, "funcs"))));
451 |
452 | reg_table = g_new(register_reassembly_table_t,1)((register_reassembly_table_t *) g_malloc_n ((1), sizeof (register_reassembly_table_t )));
453 |
454 | reg_table->table = table;
455 | reg_table->funcs = funcs;
456 |
457 | reassembly_table_list = g_list_prepend(reassembly_table_list, reg_table);
458 | }
459 |
460 | /*
461 | * Initialize a reassembly table, with specified functions.
462 | */
463 | void
464 | reassembly_table_init(reassembly_table *table,
465 | const reassembly_table_functions *funcs)
466 | {
467 | if (table->temporary_key_func == NULL((void*)0))
468 | table->temporary_key_func = funcs->temporary_key_func;
469 | if (table->persistent_key_func == NULL((void*)0))
470 | table->persistent_key_func = funcs->persistent_key_func;
471 | if (table->free_temporary_key_func == NULL((void*)0))
472 | table->free_temporary_key_func = funcs->free_temporary_key_func;
473 | if (table->fragment_table != NULL((void*)0)) {
474 | /*
475 | * The fragment hash table exists.
476 | *
477 | * Remove all entries and free fragment data for each entry.
478 | *
479 | * The keys, and anything to which they point, are freed by
480 | * calling the table's key freeing function. The values
481 | * are freed in free_all_fragments().
482 | */
483 | g_hash_table_foreach_remove(table->fragment_table,
484 | free_all_fragments, NULL((void*)0));
485 | } else {
486 | /* The fragment table does not exist. Create it */
487 | table->fragment_table = g_hash_table_new_full(funcs->hash_func,
488 | funcs->equal_func, funcs->free_persistent_key_func, NULL((void*)0));
489 | }
490 |
491 | if (table->reassembled_table != NULL((void*)0)) {
492 | /*
493 | * The reassembled-packet hash table exists.
494 | *
495 | * Remove all entries and free reassembled packet
496 | * data and key for each entry.
497 | */
498 | g_hash_table_remove_all(table->reassembled_table);
499 | } else {
500 | /* The fragment table does not exist. Create it */
501 | table->reassembled_table = g_hash_table_new_full(reassembled_hash,
502 | reassembled_equal, reassembled_key_free, unref_fd_head);
503 | }
504 | }
505 |
506 | /*
507 | * Destroy a reassembly table.
508 | */
509 | void
510 | reassembly_table_destroy(reassembly_table *table)
511 | {
512 | /*
513 | * Clear the function pointers.
514 | */
515 | table->temporary_key_func = NULL((void*)0);
516 | table->persistent_key_func = NULL((void*)0);
517 | table->free_temporary_key_func = NULL((void*)0);
518 | if (table->fragment_table != NULL((void*)0)) {
519 | /*
520 | * The fragment hash table exists.
521 | *
522 | * Remove all entries and free fragment data for each entry.
523 | *
524 | * The keys, and anything to which they point, are freed by
525 | * calling the table's key freeing function. The values
526 | * are freed in free_all_fragments().
527 | */
528 | g_hash_table_foreach_remove(table->fragment_table,
529 | free_all_fragments, NULL((void*)0));
530 |
531 | /*
532 | * Now destroy the hash table.
533 | */
534 | g_hash_table_destroy(table->fragment_table);
535 | table->fragment_table = NULL((void*)0);
536 | }
537 | if (table->reassembled_table != NULL((void*)0)) {
538 | /*
539 | * The reassembled-packet hash table exists.
540 | *
541 | * Remove all entries and free reassembled packet
542 | * data and key for each entry.
543 | */
544 |
545 | g_hash_table_remove_all(table->reassembled_table);
546 |
547 | /*
548 | * Now destroy the hash table.
549 | */
550 | g_hash_table_destroy(table->reassembled_table);
551 | table->reassembled_table = NULL((void*)0);
552 | }
553 | }
554 |
555 | /*
556 | * Look up an fd_head in the fragment table, optionally returning the key
557 | * for it.
558 | */
559 | static fragment_head *
560 | lookup_fd_head(reassembly_table *table, const packet_info *pinfo,
561 | const uint32_t id, const void *data, void * *orig_keyp)
562 | {
563 | void *key;
564 | void *value;
565 |
566 | /* Create key to search hash with */
567 | key = table->temporary_key_func(pinfo, id, data);
568 |
569 | /*
570 | * Look up the reassembly in the fragment table.
571 | */
572 | if (!g_hash_table_lookup_extended(table->fragment_table, key, orig_keyp,
573 | &value))
574 | value = NULL((void*)0);
575 | /* Free the key */
576 | table->free_temporary_key_func(key);
577 |
578 | return (fragment_head *)value;
579 | }
580 |
581 | /*
582 | * Insert an fd_head into the fragment table, and return the key used.
583 | */
584 | static void *
585 | insert_fd_head(reassembly_table *table, fragment_head *fd_head,
586 | const packet_info *pinfo, const uint32_t id, const void *data)
587 | {
588 | void *key;
589 |
590 | /*
591 | * We're going to use the key to insert the fragment,
592 | * so make a persistent version of it.
593 | */
594 | key = table->persistent_key_func(pinfo, id, data);
595 | g_hash_table_insert(table->fragment_table, key, fd_head);
596 | return key;
597 | }
598 |
599 | /* This function cleans up the stored state and removes the reassembly data and
600 | * (with one exception) all allocated memory for matching reassembly.
601 | *
602 | * The exception is :
603 | * If the PDU was already completely reassembled, then the tvbuff containing the
604 | * reassembled data WILL NOT be free()d, and the pointer to that tvbuff will be
605 | * returned.
606 | * Othervise the function will return NULL.
607 | *
608 | * So, if you call fragment_delete and it returns non-NULL, YOU are responsible
609 | * to tvb_free() that tvbuff.
610 | */
611 | tvbuff_t *
612 | fragment_delete(reassembly_table *table, const packet_info *pinfo,
613 | const uint32_t id, const void *data)
614 | {
615 | fragment_head *fd_head;
616 | fragment_item *fd;
617 | tvbuff_t *fd_tvb_data=NULL((void*)0);
618 | void *key;
619 |
620 | fd_head = lookup_fd_head(table, pinfo, id, data, &key);
621 | if(fd_head==NULL((void*)0)){
622 | /* We do not recognize this as a PDU we have seen before. return */
623 | return NULL((void*)0);
624 | }
625 |
626 | fd_tvb_data=fd_head->tvb_data;
627 | /* loop over all partial fragments and free any tvbuffs */
628 | for(fd=fd_head->next;fd;){
629 | fragment_item *tmp_fd;
630 | tmp_fd=fd->next;
631 |
632 | if (fd->tvb_data && !(fd->flags & FD_SUBSET_TVB0x0020))
633 | tvb_free(fd->tvb_data);
634 | g_slice_free(fragment_item, fd)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd)); else (void) ((fragment_item*) 0 == (fd)); } while (0);
635 | fd=tmp_fd;
636 | }
637 | g_slice_free(fragment_head, fd_head)do { if (1) g_slice_free1 (sizeof (fragment_head), (fd_head)) ; else (void) ((fragment_head*) 0 == (fd_head)); } while (0);
638 | g_hash_table_remove(table->fragment_table, key);
639 |
640 | return fd_tvb_data;
641 | }
642 |
643 | /* This function is used to check if there is partial or completed reassembly state
644 | * matching this packet. I.e. Is there reassembly going on or not for this packet?
645 | */
646 | fragment_head *
647 | fragment_get(reassembly_table *table, const packet_info *pinfo,
648 | const uint32_t id, const void *data)
649 | {
650 | return lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
651 | }
652 |
653 | fragment_head *
654 | fragment_get_reassembled_id(reassembly_table *table, const packet_info *pinfo,
655 | const uint32_t id)
656 | {
657 | fragment_head *fd_head;
658 | reassembled_key key;
659 |
660 | /* create key to search hash with */
661 | key.frame = pinfo->num;
662 | key.id = id;
663 | fd_head = (fragment_head *)g_hash_table_lookup(table->reassembled_table, &key);
664 |
665 | return fd_head;
666 | }
667 |
668 | /* To specify the offset for the fragment numbering, the first fragment is added with 0, and
669 | * afterwards this offset is set. All additional calls to off_seq_check will calculate
670 | * the number in sequence in regards to the offset */
671 | void
672 | fragment_add_seq_offset(reassembly_table *table, const packet_info *pinfo, const uint32_t id,
673 | const void *data, const uint32_t fragment_offset)
674 | {
675 | fragment_head *fd_head;
676 |
677 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
678 | if (!fd_head)
679 | return;
680 |
681 | /* Resetting the offset is not allowed */
682 | if ( fd_head->fragment_nr_offset != 0 )
683 | return;
684 |
685 | fd_head->fragment_nr_offset = fragment_offset;
686 | }
687 |
688 | static void
689 | update_first_gap(fragment_head *fd_head, fragment_item *inserted, bool_Bool multi_insert)
690 | {
691 | uint32_t frag_end = inserted->offset + inserted->len;
692 | fragment_item *iter;
693 | uint32_t contiguous;
694 |
695 | if (inserted->offset > fd_head->contiguous_len) {
696 | /* first inserted node is after first gap */
697 | return;
698 | } else if (fd_head->first_gap == NULL((void*)0)) {
699 | /* we haven't seen first fragment yet */
700 | if (inserted->offset != 0) {
701 | /* inserted node is not first fragment */
702 | return;
703 | }
704 | contiguous = inserted->len;
705 | iter = inserted;
706 | } else {
707 | contiguous = MAX(fd_head->contiguous_len, frag_end)(((fd_head->contiguous_len) > (frag_end)) ? (fd_head-> contiguous_len) : (frag_end));
708 | iter = multi_insert ? inserted : fd_head->first_gap;
709 | }
710 |
711 | while (iter->next) {
712 | if (iter->next->offset > contiguous) {
713 | break;
714 | }
715 | iter = iter->next;
716 | contiguous = MAX(contiguous, iter->offset + iter->len)(((contiguous) > (iter->offset + iter->len)) ? (contiguous ) : (iter->offset + iter->len));
717 | }
718 |
719 | /* iter is either pointing to last fragment before gap or tail */
720 | fd_head->first_gap = iter;
721 | fd_head->contiguous_len = contiguous;
722 | }
723 |
724 | /*
725 | * Keeping first gap and contiguous length in sync significantly speeds up
726 | * LINK_FRAG() when fragments in capture file are mostly ordered. However, when
727 | * fragments are removed from the list, the first gap can point to fragments
728 | * that were either moved to another list or freed. Therefore when any fragment
729 | * before first gap is removed, the first gap (and contiguous length) must be
730 | * invalidated.
731 | */
732 | static void fragment_reset_first_gap(fragment_head *fd_head)
733 | {
734 | fd_head->first_gap = NULL((void*)0);
735 | fd_head->contiguous_len = 0;
736 | if (fd_head->next) {
737 | bool_Bool multi_insert = (fd_head->next->next != NULL((void*)0));
738 | update_first_gap(fd_head, fd_head->next, multi_insert);
739 | }
740 | }
741 |
742 | /*
743 | * Determines whether list modification requires first gap reset. On entry
744 | * modified is NULL if all elements were removed, otherwise it points to
745 | * element (reachable from fd_head) whose next pointer was changed.
746 | */
747 | static void fragment_items_removed(fragment_head *fd_head, fragment_item *modified)
748 | {
749 | if ((fd_head->first_gap == modified) ||
750 | ((modified != NULL((void*)0)) && (modified->offset > fd_head->contiguous_len))) {
751 | /* Removed elements were after first gap */
752 | return;
753 | }
754 | fragment_reset_first_gap(fd_head);
755 | }
756 |
757 | /*
758 | * For use with fragment_add (and not the fragment_add_seq functions).
759 | * When the reassembled result is wrong (perhaps it needs to be extended), this
760 | * function clears any previous reassembly result, allowing the new reassembled
761 | * length to be set again.
762 | */
763 | static void
764 | fragment_reset_defragmentation(fragment_head *fd_head)
765 | {
766 | /* Caller must ensure that this function is only called when
767 | * defragmentation is safe to undo. */
768 | DISSECTOR_ASSERT(fd_head->flags & FD_DEFRAGMENTED)((void) ((fd_head->flags & 0x0001) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 768, "fd_head->flags & 0x0001" ))));
769 |
770 | for (fragment_item *fd_i = fd_head->next; fd_i; fd_i = fd_i->next) {
771 | if (!fd_i->tvb_data) {
772 | fd_i->tvb_data = tvb_new_subset_remaining(fd_head->tvb_data, fd_i->offset);
773 | fd_i->flags |= FD_SUBSET_TVB0x0020;
774 | }
775 | fd_i->flags &= (~FD_TOOLONGFRAGMENT0x0010) & (~FD_MULTIPLETAILS0x0008);
776 | }
777 | fd_head->flags &= ~(FD_DEFRAGMENTED0x0001|FD_PARTIAL_REASSEMBLY0x0040|FD_DATALEN_SET0x0400);
778 | fd_head->flags &= ~(FD_TOOLONGFRAGMENT0x0010|FD_MULTIPLETAILS0x0008);
779 | fd_head->datalen = 0;
780 | fd_head->reassembled_in = 0;
781 | fd_head->reas_in_layer_num = 0;
782 | }
783 |
784 | /* This function can be used to explicitly set the total length (if known)
785 | * for reassembly of a PDU.
786 | * This is useful for reassembly of PDUs where one may have the total length specified
787 | * in the first fragment instead of as for, say, IPv4 where a flag indicates which
788 | * is the last fragment.
789 | *
790 | * Such protocols might fragment_add with a more_frags==true for every fragment
791 | * and just tell the reassembly engine the expected total length of the reassembled data
792 | * using fragment_set_tot_len immediately after doing fragment_add for the first packet.
793 | *
794 | * Note that for FD_BLOCKSEQUENCE tot_len is the index for the tail fragment.
795 | * i.e. since the block numbers start at 0, if we specify tot_len==2, that
796 | * actually means we want to defragment 3 blocks, block 0, 1 and 2.
797 | */
798 | void
799 | fragment_set_tot_len(reassembly_table *table, const packet_info *pinfo,
800 | const uint32_t id, const void *data, const uint32_t tot_len)
801 | {
802 | fragment_head *fd_head;
803 | fragment_item *fd;
804 | uint32_t max_offset = 0;
805 |
806 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
807 | if (!fd_head)
808 | return;
809 |
810 | /* If we're setting a block sequence number, verify that it
811 | * doesn't conflict with values set by existing fragments.
812 | * XXX - eliminate this check?
813 | */
814 | if (fd_head->flags & FD_BLOCKSEQUENCE0x0100) {
815 | for (fd = fd_head->next; fd; fd = fd->next) {
816 | if (fd->offset > max_offset) {
817 | max_offset = fd->offset;
818 | if (max_offset > tot_len) {
819 | fd_head->error = "Bad total reassembly block count";
820 | THROW_MESSAGE(ReassemblyError, fd_head->error)except_throw(1, (9), (fd_head->error));
821 | }
822 | }
823 | }
824 | }
825 |
826 | if (fd_head->flags & FD_DEFRAGMENTED0x0001) {
827 | if (max_offset != tot_len) {
828 | fd_head->error = "Defragmented complete but total length not satisfied";
829 | THROW_MESSAGE(ReassemblyError, fd_head->error)except_throw(1, (9), (fd_head->error));
830 | }
831 | }
832 |
833 | /* We got this far so the value is sane. */
834 | fd_head->datalen = tot_len;
835 | fd_head->flags |= FD_DATALEN_SET0x0400;
836 | }
837 |
838 | void
839 | fragment_reset_tot_len(reassembly_table *table, const packet_info *pinfo,
840 | const uint32_t id, const void *data, const uint32_t tot_len)
841 | {
842 | fragment_head *fd_head;
843 |
844 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
845 | if (!fd_head)
846 | return;
847 |
848 | /*
849 | * If FD_PARTIAL_REASSEMBLY is set, it would make the next fragment_add
850 | * call set the reassembled length based on the fragment offset and
851 | * length. As the length is known now, be sure to disable that magic.
852 | */
853 | fd_head->flags &= ~FD_PARTIAL_REASSEMBLY0x0040;
854 |
855 | /* If the length is already as expected, there is nothing else to do. */
856 | if (tot_len == fd_head->datalen)
857 | return;
858 |
859 | if (fd_head->flags & FD_DEFRAGMENTED0x0001) {
860 | /*
861 | * Fragments were reassembled before, clear it to allow
862 | * increasing the reassembled length.
863 | */
864 | fragment_reset_defragmentation(fd_head);
865 | }
866 |
867 | fd_head->datalen = tot_len;
868 | fd_head->flags |= FD_DATALEN_SET0x0400;
869 | }
870 |
871 | void
872 | fragment_truncate(reassembly_table *table, const packet_info *pinfo,
873 | const uint32_t id, const void *data, const uint32_t tot_len)
874 |
875 | {
876 | tvbuff_t *old_tvb_data;
877 | fragment_head *fd_head;
878 |
879 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
880 | if (!fd_head)
881 | return;
882 |
883 | /* Caller must ensure that this function is only called when
884 | * we are defragmented. */
885 | DISSECTOR_ASSERT(fd_head->flags & FD_DEFRAGMENTED)((void) ((fd_head->flags & 0x0001) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 885, "fd_head->flags & 0x0001" ))));
886 |
887 | /*
888 | * If FD_PARTIAL_REASSEMBLY is set, it would make the next fragment_add
889 | * call set the reassembled length based on the fragment offset and
890 | * length. As the length is known now, be sure to disable that magic.
891 | */
892 | fd_head->flags &= ~FD_PARTIAL_REASSEMBLY0x0040;
893 |
894 | /* If the length is already as expected, there is nothing else to do. */
895 | if (tot_len == fd_head->datalen)
896 | return;
897 |
898 | DISSECTOR_ASSERT(fd_head->datalen > tot_len)((void) ((fd_head->datalen > tot_len) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 898, "fd_head->datalen > tot_len" ))));
899 |
900 | old_tvb_data=fd_head->tvb_data;
901 | fd_head->tvb_data = tvb_clone_offset_len(old_tvb_data, 0, tot_len);
902 | tvb_set_free_cb(fd_head->tvb_data, g_free);
903 |
904 | if (old_tvb_data)
905 | tvb_add_to_chain(fd_head->tvb_data, old_tvb_data);
906 | fd_head->datalen = tot_len;
907 |
908 | /* Keep the fragments before the split point, dividing any if
909 | * necessary.
910 | * XXX: In rare cases, there might be fragments marked as overlap that
911 | * have data both before and after the split point, and which only
912 | * overlap after the split point. In that case, after dividing the
913 | * fragments the first part no longer overlap.
914 | * However, at this point we can't test for overlap conflicts,
915 | * so we'll just leave the overlap flags as-is.
916 | */
917 | fd_head->flags &= ~(FD_OVERLAP0x0002|FD_OVERLAPCONFLICT0x0004|FD_TOOLONGFRAGMENT0x0010|FD_MULTIPLETAILS0x0008);
918 | fragment_item *fd_i, *prev_fd = NULL((void*)0);
919 | for (fd_i = fd_head->next; fd_i && (fd_i->offset < tot_len); fd_i = fd_i->next) {
920 | fd_i->flags &= ~(FD_TOOLONGFRAGMENT0x0010|FD_MULTIPLETAILS0x0008);
921 | /* Check for the split point occurring in the middle of the
922 | * fragment. */
923 | if (fd_i->offset + fd_i->len > tot_len) {
924 | fd_i->len = tot_len - fd_i->offset;
925 | }
926 | fd_head->flags |= fd_i->flags & (FD_OVERLAP0x0002|FD_OVERLAPCONFLICT0x0004);
927 | prev_fd = fd_i;
928 |
929 | /* Below should do nothing since this is already defragmented */
930 | if (fd_i->flags & FD_SUBSET_TVB0x0020)
931 | fd_i->flags &= ~FD_SUBSET_TVB0x0020;
932 | else if (fd_i->tvb_data)
933 | tvb_free(fd_i->tvb_data);
934 |
935 | fd_i->tvb_data=NULL((void*)0);
936 | }
937 |
938 | /* Remove all the other fragments, as they are past the split point. */
939 | if (prev_fd) {
940 | prev_fd->next = NULL((void*)0);
941 | } else {
942 | fd_head->next = NULL((void*)0);
943 | }
944 | fd_head->contiguous_len = MIN(fd_head->contiguous_len, tot_len)(((fd_head->contiguous_len) < (tot_len)) ? (fd_head-> contiguous_len) : (tot_len));
945 | fragment_items_removed(fd_head, prev_fd);
946 | fragment_item *tmp_fd;
947 | for (; fd_i; fd_i = tmp_fd) {
948 | tmp_fd=fd_i->next;
949 |
950 | if (fd_i->tvb_data && !(fd_i->flags & FD_SUBSET_TVB0x0020))
951 | tvb_free(fd_i->tvb_data);
952 | g_slice_free(fragment_item, fd_i)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd_i)); else (void) ((fragment_item*) 0 == (fd_i)); } while (0);
953 | }
954 | }
955 |
956 | uint32_t
957 | fragment_get_tot_len(reassembly_table *table, const packet_info *pinfo,
958 | const uint32_t id, const void *data)
959 | {
960 | fragment_head *fd_head;
961 |
962 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
963 |
964 | if(fd_head){
965 | return fd_head->datalen;
966 | }
967 |
968 | return 0;
969 | }
970 |
971 | /* This function will set the partial reassembly flag for a fh.
972 | When this function is called, the fh MUST already exist, i.e.
973 | the fh MUST be created by the initial call to fragment_add() before
974 | this function is called.
975 | Also note that this function MUST be called to indicate a fh will be
976 | extended (increase the already stored data)
977 | */
978 |
979 | void
980 | fragment_set_partial_reassembly(reassembly_table *table,
981 | const packet_info *pinfo, const uint32_t id,
982 | const void *data)
983 | {
984 | fragment_head *fd_head;
985 |
986 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
987 |
988 | /*
989 | * XXX - why not do all the stuff done early in "fragment_add_work()",
990 | * turning off FD_DEFRAGMENTED and pointing the fragments' data
991 | * pointers to the appropriate part of the already-reassembled
992 | * data, and clearing the data length and "reassembled in" frame
993 | * number, here? We currently have a hack in the TCP dissector
994 | * not to set the "reassembled in" value if the "partial reassembly"
995 | * flag is set, so that in the first pass through the packets
996 | * we don't falsely set a packet as reassembled in that packet
997 | * if the dissector decided that even more reassembly was needed.
998 | */
999 | if(fd_head){
1000 | fd_head->flags |= FD_PARTIAL_REASSEMBLY0x0040;
1001 | }
1002 | }
1003 |
1004 | /*
1005 | * This function gets rid of an entry from a fragment table, given
1006 | * a pointer to the key for that entry.
1007 | *
1008 | * The key freeing routine will be called by g_hash_table_remove().
1009 | */
1010 | static void
1011 | fragment_unhash(reassembly_table *table, void *key)
1012 | {
1013 | /*
1014 | * Remove the entry from the fragment table.
1015 | */
1016 | g_hash_table_remove(table->fragment_table, key);
1017 | }
1018 |
1019 | /*
1020 | * This function adds fragment_head structure to a reassembled-packet
1021 | * hash table, using the frame numbers of each of the frames from
1022 | * which it was reassembled as keys, and sets the "reassembled_in"
1023 | * frame number.
1024 | */
1025 | static void
1026 | fragment_reassembled(reassembly_table *table, fragment_head *fd_head,
1027 | const packet_info *pinfo, const uint32_t id)
1028 | {
1029 | reassembled_key *new_key;
1030 | fragment_item *fd;
1031 |
1032 | fd_head->ref_count = 0;
1033 | if (fd_head->next == NULL((void*)0)) {
1034 | /*
1035 | * This was not fragmented, so there's no fragment
1036 | * table; just hash it using the current frame number.
1037 | */
1038 | new_key = g_slice_new(reassembled_key)((reassembled_key*) g_slice_alloc (sizeof (reassembled_key)));
1039 | new_key->frame = pinfo->num;
1040 | new_key->id = id;
1041 | reassembled_table_insert(table->reassembled_table, new_key, fd_head);
1042 | } else {
1043 | /*
1044 | * Hash it with the frame numbers for all the frames.
1045 | */
1046 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next){
1047 | new_key = g_slice_new(reassembled_key)((reassembled_key*) g_slice_alloc (sizeof (reassembled_key)));
1048 | new_key->frame = fd->frame;
1049 | new_key->id = id;
1050 | reassembled_table_insert(table->reassembled_table, new_key, fd_head);
1051 | }
1052 | }
1053 | fd_head->flags |= FD_DEFRAGMENTED0x0001;
1054 | fd_head->reassembled_in = pinfo->num;
1055 | fd_head->reas_in_layer_num = pinfo->curr_layer_num;
1056 | }
1057 |
1058 | /*
1059 | * This function is a variant of the above for the single sequence
1060 | * case, using id+offset (i.e., the original sequence number) for the id
1061 | * in the key.
1062 | */
1063 | static void
1064 | fragment_reassembled_single(reassembly_table *table, fragment_head *fd_head,
1065 | const packet_info *pinfo, const uint32_t id)
1066 | {
1067 | reassembled_key *new_key;
1068 | fragment_item *fd;
1069 |
1070 | fd_head->ref_count = 0;
1071 | if (fd_head->next == NULL((void*)0)) {
1072 | /*
1073 | * This was not fragmented, so there's no fragment
1074 | * table; just hash it using the current frame number.
1075 | */
1076 | new_key = g_slice_new(reassembled_key)((reassembled_key*) g_slice_alloc (sizeof (reassembled_key)));
1077 | new_key->frame = pinfo->num;
1078 | new_key->id = id;
1079 | reassembled_table_insert(table->reassembled_table, new_key, fd_head);
1080 | } else {
1081 | /*
1082 | * Hash it with the frame numbers for all the frames.
1083 | */
1084 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next){
1085 | new_key = g_slice_new(reassembled_key)((reassembled_key*) g_slice_alloc (sizeof (reassembled_key)));
1086 | new_key->frame = fd->frame;
1087 | new_key->id = id + fd->offset;
1088 | reassembled_table_insert(table->reassembled_table, new_key, fd_head);
1089 | }
1090 | }
1091 | fd_head->flags |= FD_DEFRAGMENTED0x0001;
1092 | fd_head->reassembled_in = pinfo->num;
1093 | fd_head->reas_in_layer_num = pinfo->curr_layer_num;
1094 | }
1095 |
1096 | static void
1097 | LINK_FRAG(fragment_head *fd_head,fragment_item *fd)
1098 | {
1099 | fragment_item *fd_i;
1100 |
1101 | /* add fragment to list, keep list sorted */
1102 | if (fd_head->next == NULL((void*)0) || fd->offset < fd_head->next->offset) {
1103 | /* New first fragment */
1104 | fd->next = fd_head->next;
1105 | fd_head->next = fd;
1106 | } else {
1107 | fd_i = fd_head->next;
1108 | if (fd_head->first_gap != NULL((void*)0)) {
1109 | if (fd->offset >= fd_head->first_gap->offset) {
1110 | /* fragment is after first gap */
1111 | fd_i = fd_head->first_gap;
1112 | }
1113 | }
1114 | for(; fd_i->next; fd_i=fd_i->next) {
1115 | if (fd->offset < fd_i->next->offset )
1116 | break;
1117 | }
1118 | fd->next = fd_i->next;
1119 | fd_i->next = fd;
1120 | }
1121 |
1122 | update_first_gap(fd_head, fd, false0);
1123 | }
1124 |
1125 | static void
1126 | MERGE_FRAG(fragment_head *fd_head, fragment_item *fd)
1127 | {
1128 | fragment_item *fd_i, *tmp, *inserted = fd;
1129 | bool_Bool multi_insert;
1130 |
1131 | if (fd == NULL((void*)0)) return;
1132 |
1133 | multi_insert = (fd->next != NULL((void*)0));
1134 |
1135 | if (fd_head->next == NULL((void*)0)) {
1136 | fd_head->next = fd;
1137 | update_first_gap(fd_head, fd, multi_insert);
1138 | return;
1139 | }
1140 |
1141 | if ((fd_head->first_gap != NULL((void*)0)) &&
1142 | (fd->offset >= fd_head->first_gap->offset)) {
1143 | /* all new fragments go after first gap */
1144 | fd_i = fd_head->first_gap;
1145 | } else {
1146 | /* at least one new fragment goes before first gap */
1147 | if (fd->offset < fd_head->next->offset) {
1148 | /* inserted fragment is new head, "swap" the lists */
1149 | tmp = fd_head->next;
1150 | fd_head->next = fd;
1151 | fd = tmp;
1152 | }
1153 | fd_i = fd_head->next;
1154 | }
1155 |
1156 | /* Traverse the list linked to fragment head ("main" list), checking if
1157 | * fd pointer ("merge" list) should go before or after fd_i->next. Swap
1158 | * fd_i->next ("main") and fd pointers ("merge") if "merge" list should
1159 | * go before iterated element (fd_i). After the swap what formerly was
1160 | * "merge" list essentially becomes part of "main" list (just detached
1161 | * element, i.e. fd, is now head of new "merge list").
1162 | */
1163 | for(; fd_i->next; fd_i=fd_i->next) {
1164 | if (fd->offset < fd_i->next->offset) {
1165 | tmp = fd_i->next;
1166 | fd_i->next = fd;
1167 | fd = tmp;
1168 | }
1169 | }
1170 | /* Reached "main" list end, attach remaining elements */
1171 | fd_i->next = fd;
1172 |
1173 | update_first_gap(fd_head, inserted, multi_insert);
1174 | }
1175 |
1176 | /*
1177 | * This function adds a new fragment to the fragment hash table.
1178 | * If this is the first fragment seen for this datagram, a new entry
1179 | * is created in the hash table, otherwise this fragment is just added
1180 | * to the linked list of fragments for this packet.
1181 | * The list of fragments for a specific datagram is kept sorted for
1182 | * easier handling.
1183 | *
1184 | * Returns a pointer to the head of the fragment data list if we have all the
1185 | * fragments, NULL otherwise.
1186 | *
1187 | * This function assumes frag_offset being a byte offset into the defragment
1188 | * packet.
1189 | *
1190 | * 01-2002
1191 | * Once the fh is defragmented (= FD_DEFRAGMENTED set), it can be
1192 | * extended using the FD_PARTIAL_REASSEMBLY flag. This flag should be set
1193 | * using fragment_set_partial_reassembly() before calling fragment_add
1194 | * with the new fragment. FD_TOOLONGFRAGMENT and FD_MULTIPLETAILS flags
1195 | * are lowered when a new extension process is started.
1196 | */
1197 | static bool_Bool
1198 | fragment_add_work(fragment_head *fd_head, tvbuff_t *tvb, const int offset,
1199 | const packet_info *pinfo, const uint32_t frag_offset,
1200 | const uint32_t frag_data_len, const bool_Bool more_frags,
1201 | const uint32_t frag_frame, const bool_Bool allow_overlaps)
1202 | {
1203 | fragment_item *fd;
1204 | fragment_item *fd_i;
1205 | uint32_t dfpos, fraglen, overlap;
1206 | tvbuff_t *old_tvb_data;
1207 | uint8_t *data;
1208 |
1209 | /* create new fd describing this fragment */
1210 | fd = g_slice_new(fragment_item)((fragment_item*) g_slice_alloc (sizeof (fragment_item)));
1211 | fd->next = NULL((void*)0);
1212 | fd->flags = 0;
1213 | fd->frame = frag_frame;
1214 | fd->offset = frag_offset;
1215 | fd->len = frag_data_len;
1216 | fd->tvb_data = NULL((void*)0);
1217 |
1218 | /*
1219 | * Are we adding to an already-completed reassembly?
1220 | */
1221 | if (fd_head->flags & FD_DEFRAGMENTED0x0001) {
1222 | /*
1223 | * Yes. Does this fragment go past the end of the results
1224 | * of that reassembly?
1225 | */
1226 | if (frag_offset + frag_data_len > fd_head->datalen) {
1227 | /*
1228 | * Yes. Have we been requested to continue reassembly?
1229 | */
1230 | if (fd_head->flags & FD_PARTIAL_REASSEMBLY0x0040) {
1231 | /*
1232 | * Yes. Set flag in already empty fds &
1233 | * point old fds to malloc'ed data.
1234 | */
1235 | fragment_reset_defragmentation(fd_head);
1236 | } else if (!allow_overlaps) {
1237 | /*
1238 | * No. Bail out since we have no idea what to
1239 | * do with this fragment (and if we keep going
1240 | * we'll run past the end of a buffer sooner
1241 | * or later).
1242 | */
1243 | g_slice_free(fragment_item, fd)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd)); else (void) ((fragment_item*) 0 == (fd)); } while (0);
1244 |
1245 | /*
1246 | * This is an attempt to add a fragment to a
1247 | * reassembly that had already completed.
1248 | * If it had no error, we don't want to
1249 | * mark it with an error, and if it had an
1250 | * error, we don't want to overwrite it, so
1251 | * we don't set fd_head->error.
1252 | */
1253 | if (frag_offset >= fd_head->datalen) {
1254 | /*
1255 | * The fragment starts past the end
1256 | * of the reassembled data.
1257 | */
1258 | THROW_MESSAGE(ReassemblyError, "New fragment past old data limits")except_throw(1, (9), ("New fragment past old data limits"));
1259 | } else {
1260 | /*
1261 | * The fragment starts before the end
1262 | * of the reassembled data, but
1263 | * runs past the end. That could
1264 | * just be a retransmission with extra
1265 | * data, but the calling dissector
1266 | * didn't set FD_PARTIAL_REASSEMBLY
1267 | * so it won't be handled correctly.
1268 | *
1269 | * XXX: We could set FD_TOOLONGFRAGMENT
1270 | * below instead.
1271 | */
1272 | THROW_MESSAGE(ReassemblyError, "New fragment overlaps old data (retransmission?)")except_throw(1, (9), ("New fragment overlaps old data (retransmission?)" ));
1273 | }
1274 | }
1275 | } else {
1276 | /*
1277 | * No. That means it overlaps the completed reassembly.
1278 | * This is probably a retransmission and normal
1279 | * behavior. (If not, it's because the dissector
1280 | * doesn't handle reused sequence numbers correctly,
1281 | * e.g. #10503). Handle below.
1282 | */
1283 | }
1284 | }
1285 |
1286 | /* Do this after we may have bailed out (above) so that we don't leave
1287 | * fd_head->frame in a bad state if we do */
1288 | if (fd->frame > fd_head->frame)
1289 | fd_head->frame = fd->frame;
1290 |
1291 | if (!more_frags) {
1292 | /*
1293 | * This is the tail fragment in the sequence.
1294 | */
1295 | if (fd_head->flags & FD_DATALEN_SET0x0400) {
1296 | /* ok we have already seen other tails for this packet
1297 | * it might be a duplicate.
1298 | */
1299 | if (fd_head->datalen != (fd->offset + fd->len) ){
1300 | /* Oops, this tail indicates a different packet
1301 | * len than the previous ones. Something's wrong.
1302 | */
1303 | fd->flags |= FD_MULTIPLETAILS0x0008;
1304 | fd_head->flags |= FD_MULTIPLETAILS0x0008;
1305 | }
1306 | } else {
1307 | /* This was the first tail fragment; now we know
1308 | * what the length of the packet should be.
1309 | */
1310 | fd_head->datalen = fd->offset + fd->len;
1311 | fd_head->flags |= FD_DATALEN_SET0x0400;
1312 | }
1313 | }
1314 |
1315 |
1316 |
1317 | /* If the packet is already defragmented, this MUST be an overlap.
1318 | * The entire defragmented packet is in fd_head->data.
1319 | * Even if we have previously defragmented this packet, we still
1320 | * check it. Someone might play overlap and TTL games.
1321 | */
1322 | if (fd_head->flags & FD_DEFRAGMENTED0x0001) {
1323 | uint32_t end_offset = fd->offset + fd->len;
1324 | fd->flags |= FD_OVERLAP0x0002;
1325 | fd_head->flags |= FD_OVERLAP0x0002;
1326 | /* make sure it's not too long */
1327 | /* XXX: We probably don't call this, unlike the _seq()
1328 | * functions, because we throw an exception above.
1329 | */
1330 | if (end_offset > fd_head->datalen || end_offset < fd->offset || end_offset < fd->len) {
1331 | fd->flags |= FD_TOOLONGFRAGMENT0x0010;
1332 | fd_head->flags |= FD_TOOLONGFRAGMENT0x0010;
1333 | }
1334 | /* make sure it doesn't conflict with previous data */
1335 | else if ( tvb_memeql(fd_head->tvb_data, fd->offset,
1336 | tvb_get_ptr(tvb,offset,fd->len),fd->len) ){
1337 | fd->flags |= FD_OVERLAPCONFLICT0x0004;
1338 | fd_head->flags |= FD_OVERLAPCONFLICT0x0004;
1339 | }
1340 | /* it was just an overlap, link it and return */
1341 | LINK_FRAG(fd_head,fd);
1342 | return true1;
1343 | }
1344 |
1345 |
1346 |
1347 | /* If we have reached this point, the packet is not defragmented yet.
1348 | * Save all payload in a buffer until we can defragment.
1349 | */
1350 | if (!tvb_bytes_exist(tvb, offset, fd->len)) {
1351 | g_slice_free(fragment_item, fd)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd)); else (void) ((fragment_item*) 0 == (fd)); } while (0);
1352 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
1353 | }
1354 | fd->tvb_data = tvb_clone_offset_len(tvb, offset, fd->len);
1355 | LINK_FRAG(fd_head,fd);
1356 |
1357 |
1358 | if( !(fd_head->flags & FD_DATALEN_SET0x0400) ){
1359 | /* if we don't know the datalen, there are still missing
1360 | * packets. Cheaper than the check below.
1361 | */
1362 | return false0;
1363 | }
1364 |
1365 | /* Check if we have received the entire fragment. */
1366 | if (fd_head->contiguous_len < fd_head->datalen) {
1367 | /*
1368 | * The amount of contiguous data we have is less than the
1369 | * amount of data we're trying to reassemble, so we haven't
1370 | * received all packets yet.
1371 | */
1372 | return false0;
1373 | }
1374 |
1375 | /* we have received an entire packet, defragment it and
1376 | * free all fragments
1377 | */
1378 | /* store old data just in case */
1379 | old_tvb_data=fd_head->tvb_data;
1380 | data = (uint8_t *) g_malloc(fd_head->datalen);
1381 | fd_head->tvb_data = tvb_new_real_data(data, fd_head->datalen, fd_head->datalen);
1382 | tvb_set_free_cb(fd_head->tvb_data, g_free);
1383 |
1384 | /* add all data fragments */
1385 | for (dfpos=0,fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
1386 | if (fd_i->len) {
1387 | /*
1388 | * The contiguous length check above also
1389 | * ensures that the only gaps that exist here
1390 | * are ones where a fragment starts past the
1391 | * end of the reassembled datagram, and there's
1392 | * a gap between the previous fragment and
1393 | * that fragment.
1394 | *
1395 | * A "DESEGMENT_UNTIL_FIN" was involved wherein the
1396 | * FIN packet had an offset less than the highest
1397 | * fragment offset seen. [Seen from a fuzz-test:
1398 | * bug #2470]).
1399 | *
1400 | * Note that the "overlap" compare must only be
1401 | * done for fragments with (offset+len) <= fd_head->datalen
1402 | * and thus within the newly g_malloc'd buffer.
1403 | */
1404 |
1405 | if (fd_i->offset >= fd_head->datalen) {
1406 | /*
1407 | * Fragment starts after the end
1408 | * of the reassembled packet.
1409 | *
1410 | * This can happen if the length was
1411 | * set after the offending fragment
1412 | * was added to the reassembly.
1413 | *
1414 | * Flag this fragment, but don't
1415 | * try to extract any data from
1416 | * it, as there's no place to put
1417 | * it.
1418 | *
1419 | * XXX - add different flag value
1420 | * for this.
1421 | */
1422 | fd_i->flags |= FD_TOOLONGFRAGMENT0x0010;
1423 | fd_head->flags |= FD_TOOLONGFRAGMENT0x0010;
1424 | } else if (fd_i->offset + fd_i->len < fd_i->offset) {
1425 | /* Integer overflow, unhandled by rest of
1426 | * code so error out. This check handles
1427 | * all possible remaining overflows.
1428 | */
1429 | fd_head->error = "offset + len < offset";
1430 | } else if (!fd_i->tvb_data) {
1431 | fd_head->error = "no data";
1432 | } else {
1433 | fraglen = fd_i->len;
1434 | if (fd_i->offset + fraglen > fd_head->datalen) {
1435 | /*
1436 | * Fragment goes past the end
1437 | * of the packet, as indicated
1438 | * by the last fragment.
1439 | *
1440 | * This can happen if the
1441 | * length was set after the
1442 | * offending fragment was
1443 | * added to the reassembly.
1444 | *
1445 | * Mark it as such, and only
1446 | * copy from it what fits in
1447 | * the packet.
1448 | */
1449 | fd_i->flags |= FD_TOOLONGFRAGMENT0x0010;
1450 | fd_head->flags |= FD_TOOLONGFRAGMENT0x0010;
1451 | fraglen = fd_head->datalen - fd_i->offset;
1452 | }
1453 | overlap = dfpos - fd_i->offset;
1454 | /* Guaranteed to be >= 0, previous code
1455 | * has checked for gaps. */
1456 | if (overlap) {
1457 | /* duplicate/retransmission/overlap */
1458 | uint32_t cmp_len = MIN(fd_i->len,overlap)(((fd_i->len) < (overlap)) ? (fd_i->len) : (overlap) );
1459 |
1460 | fd_i->flags |= FD_OVERLAP0x0002;
1461 | fd_head->flags |= FD_OVERLAP0x0002;
1462 | if ( memcmp(data + fd_i->offset,
1463 | tvb_get_ptr(fd_i->tvb_data, 0, cmp_len),
1464 | cmp_len)
1465 | ) {
1466 | fd_i->flags |= FD_OVERLAPCONFLICT0x0004;
1467 | fd_head->flags |= FD_OVERLAPCONFLICT0x0004;
1468 | }
1469 | }
1470 | /* XXX: As in the fragment_add_seq funcs
1471 | * like fragment_defragment_and_free() the
1472 | * existing behavior does not overwrite
1473 | * overlapping bytes even if there is a
1474 | * conflict. It only adds new bytes.
1475 | *
1476 | * Since we only add fragments to a reassembly
1477 | * if the reassembly isn't complete, the most
1478 | * common case for overlap conflicts is when
1479 | * an earlier reassembly isn't fully contained
1480 | * in the capture, and we've reused an
1481 | * identification number / wrapped around
1482 | * offset sequence numbers much later in the
1483 | * capture. In that case, we probably *do*
1484 | * want to overwrite conflicting bytes, since
1485 | * the earlier fragments didn't form a complete
1486 | * reassembly and should be effectively thrown
1487 | * out rather than mixed with the new ones?
1488 | */
1489 | if (fd_i->offset + fraglen > dfpos) {
1490 | memcpy(data+dfpos,
1491 | tvb_get_ptr(fd_i->tvb_data, overlap, fraglen-overlap),
1492 | fraglen-overlap);
1493 | dfpos = fd_i->offset + fraglen;
1494 | }
1495 | }
1496 |
1497 | if (fd_i->flags & FD_SUBSET_TVB0x0020)
1498 | fd_i->flags &= ~FD_SUBSET_TVB0x0020;
1499 | else if (fd_i->tvb_data)
1500 | tvb_free(fd_i->tvb_data);
1501 |
1502 | fd_i->tvb_data=NULL((void*)0);
1503 | }
1504 | }
1505 |
1506 | if (old_tvb_data)
1507 | tvb_add_to_chain(tvb, old_tvb_data);
1508 | /* mark this packet as defragmented.
1509 | allows us to skip any trailing fragments */
1510 | fd_head->flags |= FD_DEFRAGMENTED0x0001;
1511 | fd_head->reassembled_in=pinfo->num;
1512 | fd_head->reas_in_layer_num = pinfo->curr_layer_num;
1513 |
1514 | /* we don't throw until here to avoid leaking old_data and others */
1515 | if (fd_head->error) {
1516 | THROW_MESSAGE(ReassemblyError, fd_head->error)except_throw(1, (9), (fd_head->error));
1517 | }
1518 |
1519 | return true1;
1520 | }
1521 |
1522 | static fragment_head *
1523 | fragment_add_common(reassembly_table *table, tvbuff_t *tvb, const int offset,
1524 | const packet_info *pinfo, const uint32_t id,
1525 | const void *data, const uint32_t frag_offset,
1526 | const uint32_t frag_data_len, const bool_Bool more_frags,
1527 | const bool_Bool check_already_added,
1528 | const uint32_t frag_frame)
1529 | {
1530 | fragment_head *fd_head;
1531 | fragment_item *fd_item;
1532 | bool_Bool already_added;
1533 |
1534 |
1535 | /*
1536 | * Dissector shouldn't give us garbage tvb info.
1537 | *
1538 | * XXX - should this code take responsibility for preventing
1539 | * reassembly if data is missing due to the packets being
1540 | * sliced, rather than leaving it up to dissectors?
1541 | */
1542 | DISSECTOR_ASSERT(tvb_bytes_exist(tvb, offset, frag_data_len))((void) ((tvb_bytes_exist(tvb, offset, frag_data_len)) ? (void )0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 1542, "tvb_bytes_exist(tvb, offset, frag_data_len)" ))));
1543 |
1544 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
1545 |
1546 | #if 0
1547 | /* debug output of associated fragments. */
1548 | /* leave it here for future debugging sessions */
1549 | if(strcmp(pinfo->current_proto, "DCERPC") == 0) {
1550 | printf("proto:%s num:%u id:%u offset:%u len:%u more:%u visited:%u\n",
1551 | pinfo->current_proto, pinfo->num, id, frag_offset, frag_data_len, more_frags, pinfo->fd->visited);
1552 | if(fd_head != NULL((void*)0)) {
1553 | for(fd_item=fd_head->next;fd_item;fd_item=fd_item->next){
1554 | printf("fd_frame:%u fd_offset:%u len:%u datalen:%u\n",
1555 | fd_item->frame, fd_item->offset, fd_item->len, fd_item->datalen);
1556 | }
1557 | }
1558 | }
1559 | #endif
1560 |
1561 | /*
1562 | * Is this the first pass through the capture?
1563 | */
1564 | if (!pinfo->fd->visited) {
1565 | /*
1566 | * Yes, so we could be doing reassembly. If
1567 | * "check_already_added" is true, and fd_head is non-null,
1568 | * meaning that this fragment would be added to an
1569 | * in-progress reassembly, check if we have seen this
1570 | * fragment before, i.e., if we have already added it to
1571 | * that reassembly. That can be true even on the first pass
1572 | * since we sometimes might call a subdissector multiple
1573 | * times.
1574 | *
1575 | * We check both the frame number and the fragment offset,
1576 | * so that we support multiple fragments from the same
1577 | * frame being added to the same reassembled PDU.
1578 | */
1579 | if (check_already_added && fd_head != NULL((void*)0)) {
1580 | /*
1581 | * fd_head->frame is the maximum of the frame
1582 | * numbers of all the fragments added to this
1583 | * reassembly; if this frame is later than that
1584 | * frame, we know it hasn't been added yet.
1585 | */
1586 | if (frag_frame <= fd_head->frame) {
1587 | already_added = false0;
1588 | /*
1589 | * The first item in the reassembly list
1590 | * is not a fragment, it's a data structure
1591 | * for the reassembled packet, so we
1592 | * start checking with the next item.
1593 | */
1594 | for (fd_item = fd_head->next; fd_item;
1595 | fd_item = fd_item->next) {
1596 | if (frag_frame == fd_item->frame &&
1597 | frag_offset == fd_item->offset) {
1598 | already_added = true1;
1599 | break;
1600 | }
1601 | }
1602 | if (already_added) {
1603 | /*
1604 | * Have we already finished
1605 | * reassembling?
1606 | */
1607 | if (fd_head->flags & FD_DEFRAGMENTED0x0001) {
1608 | /*
1609 | * Yes.
1610 | * XXX - can this ever happen?
1611 | */
1612 | THROW_MESSAGE(ReassemblyError,except_throw(1, (9), ("Frame already added in first pass"))
1613 | "Frame already added in first pass")except_throw(1, (9), ("Frame already added in first pass"));
1614 | } else {
1615 | /*
1616 | * No.
1617 | */
1618 | return NULL((void*)0);
1619 | }
1620 | }
1621 | }
1622 | }
1623 | } else {
1624 | /*
1625 | * No, so we've already done all the reassembly and added
1626 | * all the fragments. Do we have a reassembly and, if so,
1627 | * have we finished reassembling?
1628 | */
1629 | if (fd_head != NULL((void*)0) && fd_head->flags & FD_DEFRAGMENTED0x0001) {
1630 | /*
1631 | * Yes. This is probably being done after the
1632 | * first pass, and we've already done the work
1633 | * on the first pass.
1634 | *
1635 | * If the reassembly got a fatal error, throw that
1636 | * error again.
1637 | */
1638 | if (fd_head->error)
1639 | THROW_MESSAGE(ReassemblyError, fd_head->error)except_throw(1, (9), (fd_head->error));
1640 |
1641 | /*
1642 | * Is it later in the capture than all of the
1643 | * fragments in the reassembly?
1644 | */
1645 | if (frag_frame > fd_head->frame) {
1646 | /*
1647 | * Yes, so report this as a problem,
1648 | * possibly a retransmission.
1649 | */
1650 | THROW_MESSAGE(ReassemblyError, "New fragment overlaps old data (retransmission?)")except_throw(1, (9), ("New fragment overlaps old data (retransmission?)" ));
1651 | }
1652 |
1653 | /*
1654 | * Does this fragment go past the end of the
1655 | * results of that reassembly?
1656 | */
1657 | if (frag_offset + frag_data_len > fd_head->datalen) {
1658 | /*
1659 | * Yes.
1660 | */
1661 | if (frag_offset >= fd_head->datalen) {
1662 | /*
1663 | * The fragment starts past the
1664 | * end of the reassembled data.
1665 | */
1666 | THROW_MESSAGE(ReassemblyError, "New fragment past old data limits")except_throw(1, (9), ("New fragment past old data limits"));
1667 | } else {
1668 | /*
1669 | * The fragment starts before the end
1670 | * of the reassembled data, but
1671 | * runs past the end. That could
1672 | * just be a retransmission.
1673 | */
1674 | THROW_MESSAGE(ReassemblyError, "New fragment overlaps old data (retransmission?)")except_throw(1, (9), ("New fragment overlaps old data (retransmission?)" ));
1675 | }
1676 | }
1677 |
1678 | return fd_head;
1679 | } else {
1680 | /*
1681 | * No.
1682 | */
1683 | return NULL((void*)0);
1684 | }
1685 | }
1686 |
1687 | if (fd_head==NULL((void*)0)){
1688 | /* not found, this must be the first snooped fragment for this
1689 | * packet. Create list-head.
1690 | */
1691 | fd_head = new_head(0);
1692 |
1693 | /*
1694 | * Insert it into the hash table.
1695 | */
1696 | insert_fd_head(table, fd_head, pinfo, id, data);
1697 | }
1698 |
1699 | if (fragment_add_work(fd_head, tvb, offset, pinfo, frag_offset,
1700 | frag_data_len, more_frags, frag_frame, false0)) {
1701 | /*
1702 | * Reassembly is complete.
1703 | */
1704 | return fd_head;
1705 | } else {
1706 | /*
1707 | * Reassembly isn't complete.
1708 | */
1709 | return NULL((void*)0);
1710 | }
1711 | }
1712 |
1713 | fragment_head *
1714 | fragment_add(reassembly_table *table, tvbuff_t *tvb, const int offset,
1715 | const packet_info *pinfo, const uint32_t id, const void *data,
1716 | const uint32_t frag_offset, const uint32_t frag_data_len,
1717 | const bool_Bool more_frags)
1718 | {
1719 | return fragment_add_common(table, tvb, offset, pinfo, id, data,
1720 | frag_offset, frag_data_len, more_frags, true1, pinfo->num);
1721 | }
1722 |
1723 | /*
1724 | * For use when you can have multiple fragments in the same frame added
1725 | * to the same reassembled PDU, e.g. with ONC RPC-over-TCP.
1726 | */
1727 | fragment_head *
1728 | fragment_add_multiple_ok(reassembly_table *table, tvbuff_t *tvb,
1729 | const int offset, const packet_info *pinfo,
1730 | const uint32_t id, const void *data,
1731 | const uint32_t frag_offset,
1732 | const uint32_t frag_data_len, const bool_Bool more_frags)
1733 | {
1734 | return fragment_add_common(table, tvb, offset, pinfo, id, data,
1735 | frag_offset, frag_data_len, more_frags, false0, pinfo->num);
1736 | }
1737 |
1738 | /*
1739 | * For use in protocols like TCP when you are adding an out of order segment
1740 | * that arrived in an earlier frame because the correct fragment id could not
1741 | * be determined until later. By allowing fd->frame to be different than
1742 | * pinfo->num, show_fragment_tree will display the correct fragment numbers.
1743 | *
1744 | * Note that pinfo is still used to set reassembled_in if we have all the
1745 | * fragments, so that results on subsequent passes can be the same as the
1746 | * first pass.
1747 | */
1748 | fragment_head *
1749 | fragment_add_out_of_order(reassembly_table *table, tvbuff_t *tvb,
1750 | const int offset, const packet_info *pinfo,
1751 | const uint32_t id, const void *data,
1752 | const uint32_t frag_offset,
1753 | const uint32_t frag_data_len,
1754 | const bool_Bool more_frags, const uint32_t frag_frame)
1755 | {
1756 | return fragment_add_common(table, tvb, offset, pinfo, id, data,
1757 | frag_offset, frag_data_len, more_frags, true1, frag_frame);
1758 | }
1759 |
1760 | fragment_head *
1761 | fragment_add_check_with_fallback(reassembly_table *table, tvbuff_t *tvb, const int offset,
1762 | const packet_info *pinfo, const uint32_t id,
1763 | const void *data, const uint32_t frag_offset,
1764 | const uint32_t frag_data_len, const bool_Bool more_frags,
1765 | const uint32_t fallback_frame)
1766 | {
1767 | reassembled_key reass_key;
1768 | fragment_head *fd_head;
1769 | void *orig_key;
1770 | bool_Bool late_retransmission = false0;
1771 |
1772 | /*
1773 | * If this isn't the first pass, look for this frame in the table
1774 | * of reassembled packets.
1775 | */
1776 | if (pinfo->fd->visited) {
1777 | reass_key.frame = pinfo->num;
1778 | reass_key.id = id;
1779 | return (fragment_head *)g_hash_table_lookup(table->reassembled_table, &reass_key);
1780 | }
1781 |
1782 | /* Looks up a key in the GHashTable, returning the original key and the associated value
1783 | * and a bool which is true if the key was found. This is useful if you need to free
1784 | * the memory allocated for the original key, for example before calling g_hash_table_remove()
1785 | */
1786 | fd_head = lookup_fd_head(table, pinfo, id, data, &orig_key);
1787 | if ((fd_head == NULL((void*)0)) && (fallback_frame != pinfo->num)) {
1788 | /* Check if there is completed reassembly reachable from fallback frame */
1789 | reass_key.frame = fallback_frame;
1790 | reass_key.id = id;
1791 | fd_head = (fragment_head *)g_hash_table_lookup(table->reassembled_table, &reass_key);
1792 | if (fd_head != NULL((void*)0)) {
1793 | /* Found completely reassembled packet, hash it with current frame number */
1794 | reassembled_key *new_key = g_slice_new(reassembled_key)((reassembled_key*) g_slice_alloc (sizeof (reassembled_key)));
1795 | new_key->frame = pinfo->num;
1796 | new_key->id = id;
1797 | reassembled_table_insert(table->reassembled_table, new_key, fd_head);
1798 | late_retransmission = true1;
1799 | }
1800 | }
1801 | if (fd_head == NULL((void*)0)) {
1802 | /* not found, this must be the first snooped fragment for this
1803 | * packet. Create list-head.
1804 | */
1805 | fd_head = new_head(0);
1806 |
1807 | /*
1808 | * Save the key, for unhashing it later.
1809 | */
1810 | orig_key = insert_fd_head(table, fd_head, pinfo, id, data);
1811 | }
1812 |
1813 | /*
1814 | * If this is a short frame, then we can't, and don't, do
1815 | * reassembly on it. We just give up.
1816 | */
1817 | if (!tvb_bytes_exist(tvb, offset, frag_data_len)) {
1818 | return NULL((void*)0);
1819 | }
1820 |
1821 | if (fragment_add_work(fd_head, tvb, offset, pinfo, frag_offset,
1822 | frag_data_len, more_frags, pinfo->num, late_retransmission)) {
1823 | /* Nothing left to do if it was a late retransmission */
1824 | if (late_retransmission) {
1825 | return fd_head;
1826 | }
1827 | /*
1828 | * Reassembly is complete.
1829 | * Remove this from the table of in-progress
1830 | * reassemblies, add it to the table of
1831 | * reassembled packets, and return it.
1832 | */
1833 |
1834 | /*
1835 | * Remove this from the table of in-progress reassemblies,
1836 | * and free up any memory used for it in that table.
1837 | */
1838 | fragment_unhash(table, orig_key);
1839 |
1840 | /*
1841 | * Add this item to the table of reassembled packets.
1842 | */
1843 | fragment_reassembled(table, fd_head, pinfo, id);
1844 | return fd_head;
1845 | } else {
1846 | /*
1847 | * Reassembly isn't complete.
1848 | */
1849 | return NULL((void*)0);
1850 | }
1851 | }
1852 |
1853 | fragment_head *
1854 | fragment_add_check(reassembly_table *table, tvbuff_t *tvb, const int offset,
1855 | const packet_info *pinfo, const uint32_t id,
1856 | const void *data, const uint32_t frag_offset,
1857 | const uint32_t frag_data_len, const bool_Bool more_frags)
1858 | {
1859 | return fragment_add_check_with_fallback(table, tvb, offset, pinfo, id, data,
1860 | frag_offset, frag_data_len, more_frags, pinfo->num);
1861 | }
1862 |
1863 | static void
1864 | fragment_defragment_and_free (fragment_head *fd_head, const packet_info *pinfo)
1865 | {
1866 | fragment_item *fd_i = NULL((void*)0);
1867 | fragment_item *last_fd = NULL((void*)0);
1868 | uint32_t dfpos = 0, size = 0;
1869 | tvbuff_t *old_tvb_data = NULL((void*)0);
1870 | uint8_t *data;
1871 |
1872 | for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
7 | ← | Loop condition is false. Execution continues on line 1880 | →
1873 | if(!last_fd || last_fd->offset!=fd_i->offset){
1874 | size+=fd_i->len;
1875 | }
1876 | last_fd=fd_i;
1877 | }
1878 |
1879 | /* store old data in case the fd_i->data pointers refer to it */
1880 | old_tvb_data=fd_head->tvb_data;
1881 | data = (uint8_t *) g_malloc(size);
8 | ← | Memory is allocated | →
1882 | fd_head->tvb_data = tvb_new_real_data(data, size, size);
1883 | tvb_set_free_cb(fd_head->tvb_data, g_free);
1884 | fd_head->len = size; /* record size for caller */
1885 |
1886 | /* add all data fragments */
1887 | last_fd=NULL((void*)0);
1888 | for (fd_i=fd_head->next; fd_i; fd_i=fd_i->next) {
9 | ← | Loop condition is false. Execution jumps to the end of the function | →
1889 | if (fd_i->len) {
1890 | if(!last_fd || last_fd->offset != fd_i->offset) {
1891 | /* First fragment or in-sequence fragment */
1892 | memcpy(data+dfpos, tvb_get_ptr(fd_i->tvb_data, 0, fd_i->len), fd_i->len);
1893 | dfpos += fd_i->len;
1894 | } else {
1895 | /* duplicate/retransmission/overlap */
1896 | fd_i->flags |= FD_OVERLAP0x0002;
1897 | fd_head->flags |= FD_OVERLAP0x0002;
1898 | if(last_fd->len != fd_i->len
1899 | || tvb_memeql(last_fd->tvb_data, 0, tvb_get_ptr(fd_i->tvb_data, 0, last_fd->len), last_fd->len) ) {
1900 | fd_i->flags |= FD_OVERLAPCONFLICT0x0004;
1901 | fd_head->flags |= FD_OVERLAPCONFLICT0x0004;
1902 | }
1903 | }
1904 | }
1905 | last_fd=fd_i;
1906 | }
1907 |
1908 | /* we have defragmented the pdu, now free all fragments*/
1909 | for (fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
10 | ← | Potential leak of memory pointed to by 'data'
1910 | if (fd_i->flags & FD_SUBSET_TVB0x0020)
1911 | fd_i->flags &= ~FD_SUBSET_TVB0x0020;
1912 | else if (fd_i->tvb_data)
1913 | tvb_free(fd_i->tvb_data);
1914 | fd_i->tvb_data=NULL((void*)0);
1915 | }
1916 | if (old_tvb_data)
1917 | tvb_free(old_tvb_data);
1918 |
1919 | /* mark this packet as defragmented.
1920 | * allows us to skip any trailing fragments.
1921 | */
1922 | fd_head->flags |= FD_DEFRAGMENTED0x0001;
1923 | fd_head->reassembled_in=pinfo->num;
1924 | fd_head->reas_in_layer_num = pinfo->curr_layer_num;
1925 | }
1926 |
1927 | /*
1928 | * This function adds a new fragment to the entry for a reassembly
1929 | * operation.
1930 | *
1931 | * The list of fragments for a specific datagram is kept sorted for
1932 | * easier handling.
1933 | *
1934 | * Returns true if we have all the fragments, false otherwise.
1935 | *
1936 | * This function assumes frag_number being a block sequence number.
1937 | * The bsn for the first block is 0.
1938 | */
1939 | static bool_Bool
1940 | fragment_add_seq_work(fragment_head *fd_head, tvbuff_t *tvb, const int offset,
1941 | const packet_info *pinfo, const uint32_t frag_number,
1942 | const uint32_t frag_data_len, const bool_Bool more_frags)
1943 | {
1944 | fragment_item *fd;
1945 | fragment_item *fd_i;
1946 | fragment_item *last_fd;
1947 | uint32_t max, dfpos;
1948 | uint32_t frag_number_work;
1949 |
1950 | /* Enables the use of fragment sequence numbers, which do not start with 0 */
1951 | frag_number_work = frag_number;
1952 | if ( fd_head->fragment_nr_offset != 0 )
1953 | if ( frag_number_work >= fd_head->fragment_nr_offset )
1954 | frag_number_work = frag_number - fd_head->fragment_nr_offset;
1955 |
1956 | /* if the partial reassembly flag has been set, and we are extending
1957 | * the pdu, un-reassemble the pdu. This means pointing old fds to malloc'ed data.
1958 | */
1959 | if(fd_head->flags & FD_DEFRAGMENTED0x0001 && frag_number_work >= fd_head->datalen &&
1960 | fd_head->flags & FD_PARTIAL_REASSEMBLY0x0040){
1961 | uint32_t lastdfpos = 0;
1962 | dfpos = 0;
1963 | for(fd_i=fd_head->next; fd_i; fd_i=fd_i->next){
1964 | if( !fd_i->tvb_data ) {
1965 | if( fd_i->flags & FD_OVERLAP0x0002 ) {
1966 | /* this is a duplicate of the previous
1967 | * fragment. */
1968 | fd_i->tvb_data = tvb_new_subset_remaining(fd_head->tvb_data, lastdfpos);
1969 | } else {
1970 | fd_i->tvb_data = tvb_new_subset_remaining(fd_head->tvb_data, dfpos);
1971 | lastdfpos = dfpos;
1972 | dfpos += fd_i->len;
1973 | }
1974 | fd_i->flags |= FD_SUBSET_TVB0x0020;
1975 | }
1976 | fd_i->flags &= (~FD_TOOLONGFRAGMENT0x0010) & (~FD_MULTIPLETAILS0x0008);
1977 | }
1978 | fd_head->flags &= ~(FD_DEFRAGMENTED0x0001|FD_PARTIAL_REASSEMBLY0x0040|FD_DATALEN_SET0x0400);
1979 | fd_head->flags &= (~FD_TOOLONGFRAGMENT0x0010) & (~FD_MULTIPLETAILS0x0008);
1980 | fd_head->datalen=0;
1981 | fd_head->reassembled_in=0;
1982 | fd_head->reas_in_layer_num = 0;
1983 | }
1984 |
1985 |
1986 | /* create new fd describing this fragment */
1987 | fd = g_slice_new(fragment_item)((fragment_item*) g_slice_alloc (sizeof (fragment_item)));
1988 | fd->next = NULL((void*)0);
1989 | fd->flags = 0;
1990 | fd->frame = pinfo->num;
1991 | fd->offset = frag_number_work;
1992 | fd->len = frag_data_len;
1993 | fd->tvb_data = NULL((void*)0);
1994 |
1995 | /* fd_head->frame is the maximum of the frame numbers of all the
1996 | * fragments added to the reassembly. */
1997 | if (fd->frame > fd_head->frame)
1998 | fd_head->frame = fd->frame;
1999 |
2000 | if (!more_frags) {
2001 | /*
2002 | * This is the tail fragment in the sequence.
2003 | */
2004 | if (fd_head->flags&FD_DATALEN_SET0x0400) {
2005 | /* ok we have already seen other tails for this packet
2006 | * it might be a duplicate.
2007 | */
2008 | if (fd_head->datalen != fd->offset ){
2009 | /* Oops, this tail indicates a different packet
2010 | * len than the previous ones. Something's wrong.
2011 | */
2012 | fd->flags |= FD_MULTIPLETAILS0x0008;
2013 | fd_head->flags |= FD_MULTIPLETAILS0x0008;
2014 | }
2015 | } else {
2016 | /* this was the first tail fragment, now we know the
2017 | * sequence number of that fragment (which is NOT
2018 | * the length of the packet!)
2019 | */
2020 | fd_head->datalen = fd->offset;
2021 | fd_head->flags |= FD_DATALEN_SET0x0400;
2022 | }
2023 | }
2024 |
2025 | /* If the packet is already defragmented, this MUST be an overlap.
2026 | * The entire defragmented packet is in fd_head->data
2027 | * Even if we have previously defragmented this packet, we still check
2028 | * check it. Someone might play overlap and TTL games.
2029 | */
2030 | if (fd_head->flags & FD_DEFRAGMENTED0x0001) {
2031 | fd->flags |= FD_OVERLAP0x0002;
2032 | fd_head->flags |= FD_OVERLAP0x0002;
2033 |
2034 | /* make sure it's not past the end */
2035 | if (fd->offset > fd_head->datalen) {
2036 | /* new fragment comes after the end */
2037 | fd->flags |= FD_TOOLONGFRAGMENT0x0010;
2038 | fd_head->flags |= FD_TOOLONGFRAGMENT0x0010;
2039 | LINK_FRAG(fd_head,fd);
2040 | return true1;
2041 | }
2042 | /* make sure it doesn't conflict with previous data */
2043 | dfpos=0;
2044 | last_fd=NULL((void*)0);
2045 | for (fd_i=fd_head->next;fd_i && (fd_i->offset!=fd->offset);fd_i=fd_i->next) {
2046 | if (!last_fd || last_fd->offset!=fd_i->offset){
2047 | dfpos += fd_i->len;
2048 | }
2049 | last_fd=fd_i;
2050 | }
2051 | if(fd_i){
2052 | /* new fragment overlaps existing fragment */
2053 | if(fd_i->len!=fd->len){
2054 | /*
2055 | * They have different lengths; this
2056 | * is definitely a conflict.
2057 | */
2058 | fd->flags |= FD_OVERLAPCONFLICT0x0004;
2059 | fd_head->flags |= FD_OVERLAPCONFLICT0x0004;
2060 | LINK_FRAG(fd_head,fd);
2061 | return true1;
2062 | }
2063 | DISSECTOR_ASSERT(fd_head->len >= dfpos + fd->len)((void) ((fd_head->len >= dfpos + fd->len) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 2063, "fd_head->len >= dfpos + fd->len" ))));
2064 | if (tvb_memeql(fd_head->tvb_data, dfpos,
2065 | tvb_get_ptr(tvb,offset,fd->len),fd->len) ){
2066 | /*
2067 | * They have the same length, but the
2068 | * data isn't the same.
2069 | */
2070 | fd->flags |= FD_OVERLAPCONFLICT0x0004;
2071 | fd_head->flags |= FD_OVERLAPCONFLICT0x0004;
2072 | LINK_FRAG(fd_head,fd);
2073 | return true1;
2074 | }
2075 | /* it was just an overlap, link it and return */
2076 | LINK_FRAG(fd_head,fd);
2077 | return true1;
2078 | } else {
2079 | /*
2080 | * New fragment doesn't overlap an existing
2081 | * fragment - there was presumably a gap in
2082 | * the sequence number space.
2083 | *
2084 | * XXX - what should we do here? Is it always
2085 | * the case that there are no gaps, or are there
2086 | * protcols using sequence numbers where there
2087 | * can be gaps?
2088 | *
2089 | * If the former, the check below for having
2090 | * received all the fragments should check for
2091 | * holes in the sequence number space and for the
2092 | * first sequence number being 0. If we do that,
2093 | * the only way we can get here is if this fragment
2094 | * is past the end of the sequence number space -
2095 | * but the check for "fd->offset > fd_head->datalen"
2096 | * would have caught that above, so it can't happen.
2097 | *
2098 | * If the latter, we don't have a good way of
2099 | * knowing whether reassembly is complete if we
2100 | * get packet out of order such that the "last"
2101 | * fragment doesn't show up last - but, unless
2102 | * in-order reliable delivery of fragments is
2103 | * guaranteed, an implementation of the protocol
2104 | * has no way of knowing whether reassembly is
2105 | * complete, either.
2106 | *
2107 | * For now, we just link the fragment in and
2108 | * return.
2109 | */
2110 | LINK_FRAG(fd_head,fd);
2111 | return true1;
2112 | }
2113 | }
2114 |
2115 | /* If we have reached this point, the packet is not defragmented yet.
2116 | * Save all payload in a buffer until we can defragment.
2117 | */
2118 | /* check len, there may be a fragment with 0 len, that is actually the tail */
2119 | if (fd->len) {
2120 | if (!tvb_bytes_exist(tvb, offset, fd->len)) {
2121 | /* abort if we didn't capture the entire fragment due
2122 | * to a too-short snapshot length */
2123 | g_slice_free(fragment_item, fd)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd)); else (void) ((fragment_item*) 0 == (fd)); } while (0);
2124 | return false0;
2125 | }
2126 |
2127 | fd->tvb_data = tvb_clone_offset_len(tvb, offset, fd->len);
2128 | }
2129 | LINK_FRAG(fd_head,fd);
2130 |
2131 |
2132 | if( !(fd_head->flags & FD_DATALEN_SET0x0400) ){
2133 | /* if we don't know the sequence number of the last fragment,
2134 | * there are definitely still missing packets. Cheaper than
2135 | * the check below.
2136 | */
2137 | return false0;
2138 | }
2139 |
2140 |
2141 | /* check if we have received the entire fragment
2142 | * this is easy since the list is sorted and the head is faked.
2143 | * common case the whole list is scanned.
2144 | */
2145 | max = 0;
2146 | for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
2147 | if ( fd_i->offset==max ){
2148 | max++;
2149 | }
2150 | }
2151 | /* max will now be datalen+1 if all fragments have been seen */
2152 |
2153 | if (max <= fd_head->datalen) {
2154 | /* we have not received all packets yet */
2155 | return false0;
2156 | }
2157 |
2158 |
2159 | if (max > (fd_head->datalen+1)) {
2160 | /* oops, too long fragment detected */
2161 | fd->flags |= FD_TOOLONGFRAGMENT0x0010;
2162 | fd_head->flags |= FD_TOOLONGFRAGMENT0x0010;
2163 | }
2164 |
2165 |
2166 | /* we have received an entire packet, defragment it and
2167 | * free all fragments
2168 | */
2169 | fragment_defragment_and_free(fd_head, pinfo);
2170 |
2171 | return true1;
2172 | }
2173 |
2174 | /*
2175 | * This function adds a new fragment to the fragment hash table.
2176 | * If this is the first fragment seen for this datagram, a new entry
2177 | * is created in the hash table, otherwise this fragment is just added
2178 | * to the linked list of fragments for this packet.
2179 | *
2180 | * Returns a pointer to the head of the fragment data list if we have all the
2181 | * fragments, NULL otherwise.
2182 | *
2183 | * This function assumes frag_number being a block sequence number.
2184 | * The bsn for the first block is 0.
2185 | */
2186 | static fragment_head *
2187 | fragment_add_seq_common(reassembly_table *table, tvbuff_t *tvb,
2188 | const int offset, const packet_info *pinfo,
2189 | const uint32_t id, const void *data,
2190 | uint32_t frag_number, const uint32_t frag_data_len,
2191 | const bool_Bool more_frags, const uint32_t flags,
2192 | void * *orig_keyp)
2193 | {
2194 | fragment_head *fd_head;
2195 | void *orig_key;
2196 |
2197 | fd_head = lookup_fd_head(table, pinfo, id, data, &orig_key);
2198 |
2199 | /* have we already seen this frame ?*/
2200 | if (pinfo->fd->visited) {
2201 | if (fd_head != NULL((void*)0) && fd_head->flags & FD_DEFRAGMENTED0x0001) {
2202 | if (orig_keyp != NULL((void*)0))
2203 | *orig_keyp = orig_key;
2204 | return fd_head;
2205 | } else {
2206 | return NULL((void*)0);
2207 | }
2208 | }
2209 |
2210 | if (fd_head==NULL((void*)0)){
2211 | /* not found, this must be the first snooped fragment for this
2212 | * packet. Create list-head.
2213 | */
2214 | fd_head= new_head(FD_BLOCKSEQUENCE0x0100);
2215 |
2216 | if((flags & (REASSEMBLE_FLAGS_NO_FRAG_NUMBER0x0001|REASSEMBLE_FLAGS_802_11_HACK0x0002))
2217 | && !more_frags) {
2218 | /*
2219 | * This is the last fragment for this packet, and
2220 | * is the only one we've seen.
2221 | *
2222 | * Either we don't have sequence numbers, in which
2223 | * case we assume this is the first fragment for
2224 | * this packet, or we're doing special 802.11
2225 | * processing, in which case we assume it's one
2226 | * of those reassembled packets with a non-zero
2227 | * fragment number (see packet-80211.c); just
2228 | * return a pointer to the head of the list;
2229 | * fragment_add_seq_check will then add it to the table
2230 | * of reassembled packets.
2231 | */
2232 | if (orig_keyp != NULL((void*)0))
2233 | *orig_keyp = NULL((void*)0);
2234 | /* To save memory, we don't actually copy the
2235 | * fragment from the tvbuff to the fragment, and in
2236 | * process_reassembled_data just return back a subset
2237 | * of the original tvbuff (which must be passed in).
2238 | */
2239 | fd_head->len = frag_data_len;
2240 | fd_head->reassembled_in=pinfo->num;
2241 | fd_head->reas_in_layer_num = pinfo->curr_layer_num;
2242 | return fd_head;
2243 | }
2244 |
2245 | orig_key = insert_fd_head(table, fd_head, pinfo, id, data);
2246 | if (orig_keyp != NULL((void*)0))
2247 | *orig_keyp = orig_key;
2248 |
2249 | /*
2250 | * If we weren't given an initial fragment number,
2251 | * make it 0.
2252 | */
2253 | if (flags & REASSEMBLE_FLAGS_NO_FRAG_NUMBER0x0001)
2254 | frag_number = 0;
2255 | } else {
2256 | if (orig_keyp != NULL((void*)0))
2257 | *orig_keyp = orig_key;
2258 |
2259 | if (flags & REASSEMBLE_FLAGS_NO_FRAG_NUMBER0x0001) {
2260 | fragment_item *fd;
2261 | /*
2262 | * If we weren't given an initial fragment number,
2263 | * use the next expected fragment number as the fragment
2264 | * number for this fragment.
2265 | */
2266 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next) {
2267 | if (fd->next == NULL((void*)0))
2268 | frag_number = fd->offset + 1;
2269 | }
2270 | }
2271 | }
2272 |
2273 | if (fragment_add_seq_work(fd_head, tvb, offset, pinfo,
2274 | frag_number, frag_data_len, more_frags)) {
2275 | /*
2276 | * Reassembly is complete.
2277 | */
2278 | return fd_head;
2279 | } else {
2280 | /*
2281 | * Reassembly isn't complete.
2282 | */
2283 | return NULL((void*)0);
2284 | }
2285 | }
2286 |
2287 | fragment_head *
2288 | fragment_add_seq(reassembly_table *table, tvbuff_t *tvb, const int offset,
2289 | const packet_info *pinfo, const uint32_t id, const void *data,
2290 | const uint32_t frag_number, const uint32_t frag_data_len,
2291 | const bool_Bool more_frags, const uint32_t flags)
2292 | {
2293 | return fragment_add_seq_common(table, tvb, offset, pinfo, id, data,
2294 | frag_number, frag_data_len,
2295 | more_frags, flags, NULL((void*)0));
2296 | }
2297 |
2298 | /*
2299 | * This does the work for "fragment_add_seq_check()" and
2300 | * "fragment_add_seq_next()".
2301 | *
2302 | * This function assumes frag_number being a block sequence number.
2303 | * The bsn for the first block is 0.
2304 | *
2305 | * If REASSEMBLE_FLAGS_NO_FRAG_NUMBER, it uses the next expected fragment number
2306 | * as the fragment number if there is a reassembly in progress, otherwise
2307 | * it uses 0.
2308 | *
2309 | * If not REASSEMBLE_FLAGS_NO_FRAG_NUMBER, it uses the "frag_number" argument as
2310 | * the fragment number.
2311 | *
2312 | * If this is the first fragment seen for this datagram, a new
2313 | * "fragment_head" structure is allocated to refer to the reassembled
2314 | * packet.
2315 | *
2316 | * This fragment is added to the linked list of fragments for this packet.
2317 | *
2318 | * If "more_frags" is false and REASSEMBLE_FLAGS_802_11_HACK (as the name
2319 | * implies, a special hack for 802.11) or REASSEMBLE_FLAGS_NO_FRAG_NUMBER
2320 | * (implying messages must be in order since there's no sequence number) are
2321 | * set in "flags", then this (one element) list is returned.
2322 | *
2323 | * If, after processing this fragment, we have all the fragments,
2324 | * "fragment_add_seq_check_work()" removes that from the fragment hash
2325 | * table if necessary and adds it to the table of reassembled fragments,
2326 | * and returns a pointer to the head of the fragment list.
2327 | *
2328 | * Otherwise, it returns NULL.
2329 | *
2330 | * XXX - Should we simply return NULL for zero-length fragments?
2331 | */
2332 | static fragment_head *
2333 | fragment_add_seq_check_work(reassembly_table *table, tvbuff_t *tvb,
2334 | const int offset, const packet_info *pinfo,
2335 | const uint32_t id, const void *data,
2336 | const uint32_t frag_number,
2337 | const uint32_t frag_data_len,
2338 | const bool_Bool more_frags, const uint32_t flags)
2339 | {
2340 | reassembled_key reass_key;
2341 | fragment_head *fd_head;
2342 | void *orig_key;
2343 |
2344 | /*
2345 | * Have we already seen this frame?
2346 | * If so, look for it in the table of reassembled packets.
2347 | */
2348 | if (pinfo->fd->visited) {
2349 | reass_key.frame = pinfo->num;
2350 | reass_key.id = id;
2351 | return (fragment_head *)g_hash_table_lookup(table->reassembled_table, &reass_key);
2352 | }
2353 |
2354 | fd_head = fragment_add_seq_common(table, tvb, offset, pinfo, id, data,
2355 | frag_number, frag_data_len,
2356 | more_frags,
2357 | flags,
2358 | &orig_key);
2359 | if (fd_head) {
2360 | /*
2361 | * Reassembly is complete.
2362 | *
2363 | * If this is in the table of in-progress reassemblies,
2364 | * remove it from that table. (It could be that this
2365 | * was the first and last fragment, so that no
2366 | * reassembly was done.)
2367 | */
2368 | if (orig_key != NULL((void*)0))
2369 | fragment_unhash(table, orig_key);
2370 |
2371 | /*
2372 | * Add this item to the table of reassembled packets.
2373 | */
2374 | fragment_reassembled(table, fd_head, pinfo, id);
2375 | return fd_head;
2376 | } else {
2377 | /*
2378 | * Reassembly isn't complete.
2379 | */
2380 | return NULL((void*)0);
2381 | }
2382 | }
2383 |
2384 | fragment_head *
2385 | fragment_add_seq_check(reassembly_table *table, tvbuff_t *tvb, const int offset,
2386 | const packet_info *pinfo, const uint32_t id,
2387 | const void *data,
2388 | const uint32_t frag_number, const uint32_t frag_data_len,
2389 | const bool_Bool more_frags)
2390 | {
2391 | return fragment_add_seq_check_work(table, tvb, offset, pinfo, id, data,
2392 | frag_number, frag_data_len,
2393 | more_frags, 0);
2394 | }
2395 |
2396 | fragment_head *
2397 | fragment_add_seq_802_11(reassembly_table *table, tvbuff_t *tvb,
2398 | const int offset, const packet_info *pinfo,
2399 | const uint32_t id, const void *data,
2400 | const uint32_t frag_number, const uint32_t frag_data_len,
2401 | const bool_Bool more_frags)
2402 | {
2403 | return fragment_add_seq_check_work(table, tvb, offset, pinfo, id, data,
2404 | frag_number, frag_data_len,
2405 | more_frags,
2406 | REASSEMBLE_FLAGS_802_11_HACK0x0002);
2407 | }
2408 |
2409 | fragment_head *
2410 | fragment_add_seq_next(reassembly_table *table, tvbuff_t *tvb, const int offset,
2411 | const packet_info *pinfo, const uint32_t id,
2412 | const void *data, const uint32_t frag_data_len,
2413 | const bool_Bool more_frags)
2414 | {
2415 | /* Use a dummy frag_number (0), it is ignored since
2416 | * REASSEMBLE_FLAGS_NO_FRAG_NUMBER is set. */
2417 | return fragment_add_seq_check_work(table, tvb, offset, pinfo, id, data,
2418 | 0, frag_data_len, more_frags,
2419 | REASSEMBLE_FLAGS_NO_FRAG_NUMBER0x0001);
2420 | }
2421 |
2422 | static void
2423 | fragment_add_seq_single_move(reassembly_table *table, const packet_info *pinfo,
2424 | const uint32_t id, const void *data,
2425 | const uint32_t offset)
2426 | {
2427 | fragment_head *fh, *new_fh;
2428 | fragment_item *fd, *prev_fd;
2429 | tvbuff_t *old_tvb_data;
2430 | if (offset == 0) {
2431 | return;
2432 | }
2433 | fh = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
2434 | if (fh == NULL((void*)0)) {
2435 | /* Shouldn't be called this way.
2436 | * Probably wouldn't hurt to just create fh in this case. */
2437 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/reassemble.c", 2437 , __func__, "assertion \"not reached\" failed");
2438 | return;
2439 | }
2440 | if (fh->flags & FD_DATALEN_SET0x0400 && fh->datalen <= offset) {
2441 | /* Don't take from past the end. <= because we don't
2442 | * want to take a First fragment from the next one
2443 | * either */
2444 | return;
2445 | }
2446 | new_fh = lookup_fd_head(table, pinfo, id+offset, data, NULL((void*)0));
2447 | if (new_fh != NULL((void*)0)) {
2448 | /* Attach to the end of the sorted list. */
2449 | prev_fd = NULL((void*)0);
2450 | for(fd = fh->next; fd != NULL((void*)0); fd=fd->next) {
2451 | prev_fd = fd;
2452 | }
2453 | /* Don't take a reassembly starting with a First fragment. */
2454 | fd = new_fh->next;
2455 | if (fd && fd->offset != 0) {
2456 | fragment_item *inserted = fd;
2457 | bool_Bool multi_insert = (inserted->next != NULL((void*)0));
2458 | if (prev_fd) {
2459 | prev_fd->next = fd;
2460 | } else {
2461 | fh->next = fd;
2462 | }
2463 | for (; fd; fd=fd->next) {
2464 | fd->offset += offset;
2465 | if (fh->frame < fd->frame) {
2466 | fh->frame = fd->frame;
2467 | }
2468 | }
2469 | update_first_gap(fh, inserted, multi_insert);
2470 | /* If previously found a Last fragment,
2471 | * transfer that info to the new one. */
2472 | if (new_fh->flags & FD_DATALEN_SET0x0400) {
2473 | fh->flags |= FD_DATALEN_SET0x0400;
2474 | fh->datalen = new_fh->datalen + offset;
2475 | }
2476 | /* Now remove and delete */
2477 | new_fh->next = NULL((void*)0);
2478 | old_tvb_data = fragment_delete(table, pinfo, id+offset, data);
2479 | if (old_tvb_data)
2480 | tvb_free(old_tvb_data);
2481 | }
2482 | }
2483 | }
2484 |
2485 | static fragment_head *
2486 | fragment_add_seq_single_work(reassembly_table *table, tvbuff_t *tvb,
2487 | const int offset, const packet_info *pinfo,
2488 | const uint32_t id, const void* data,
2489 | const uint32_t frag_data_len,
2490 | const bool_Bool first, const bool_Bool last,
2491 | const uint32_t max_frags, const uint32_t max_age,
2492 | const uint32_t flags)
2493 | {
2494 | reassembled_key reass_key;
2495 | tvbuff_t *old_tvb_data;
2496 | void *orig_key;
2497 | fragment_head *fh, *new_fh;
2498 | fragment_item *fd, *prev_fd;
2499 | uint32_t frag_number, tmp_offset;
2500 | /* Have we already seen this frame?
2501 | * If so, look for it in the table of reassembled packets.
2502 | * Note here we store in the reassembly table by the single sequence
2503 | * number rather than the sequence number of the First fragment. */
2504 | if (pinfo->fd->visited) {
2505 | reass_key.frame = pinfo->num;
2506 | reass_key.id = id;
2507 | fh = (fragment_head *)g_hash_table_lookup(table->reassembled_table, &reass_key);
2508 | return fh;
2509 | }
2510 | /* First let's figure out where we want to add our new fragment */
2511 | fh = NULL((void*)0);
2512 | if (first) {
2513 | frag_number = 0;
2514 | fh = lookup_fd_head(table, pinfo, id-frag_number, data, NULL((void*)0));
2515 | if ((flags & REASSEMBLE_FLAGS_AGING0x0001) &&
2516 | fh && ((fh->frame + max_age) < pinfo->num)) {
2517 | old_tvb_data = fragment_delete(table, pinfo, id-frag_number, data);
2518 | if (old_tvb_data)
2519 | tvb_free(old_tvb_data);
2520 | fh = NULL((void*)0);
2521 | }
2522 | if (fh == NULL((void*)0)) {
2523 | /* Not found. Create list-head. */
2524 | fh = new_head(FD_BLOCKSEQUENCE0x0100);
2525 | insert_fd_head(table, fh, pinfo, id-frag_number, data);
2526 | }
2527 | /* As this is the first fragment, we might have added segments
2528 | * for this reassembly to the previous one in-progress. */
2529 | fd = NULL((void*)0);
2530 | for (frag_number=1; frag_number < max_frags; frag_number++) {
2531 | new_fh = lookup_fd_head(table, pinfo, id-frag_number, data, NULL((void*)0));
2532 | if (new_fh != NULL((void*)0)) {
2533 | prev_fd = NULL((void*)0);
2534 | new_fh->frame = 0;
2535 | for (fd=new_fh->next; fd && fd->offset < frag_number; fd=fd->next) {
2536 | prev_fd = fd;
2537 | if (new_fh->frame < fd->frame) {
2538 | new_fh->frame = fd->frame;
2539 | }
2540 | }
2541 | if (prev_fd) {
2542 | prev_fd->next = NULL((void*)0);
2543 | } else {
2544 | new_fh->next = NULL((void*)0);
2545 | }
2546 | fragment_items_removed(new_fh, prev_fd);
2547 | break;
2548 | }
2549 | }
2550 | if (fd != NULL((void*)0)) {
2551 | tmp_offset = 0;
2552 | for (prev_fd = fd; prev_fd; prev_fd = prev_fd->next) {
2553 | prev_fd->offset -= frag_number;
2554 | tmp_offset = prev_fd->offset;
2555 | if (fh->frame < prev_fd->frame) {
2556 | fh->frame = prev_fd->frame;
2557 | }
2558 | }
2559 | MERGE_FRAG(fh, fd);
2560 | if (new_fh != NULL((void*)0)) {
2561 | /* If we've moved a Last packet, change datalen.
2562 | * Second part of this test prob. redundant? */
2563 | if (new_fh->flags & FD_DATALEN_SET0x0400 &&
2564 | new_fh->datalen >= frag_number) {
2565 | fh->flags |= FD_DATALEN_SET0x0400;
2566 | fh->datalen = new_fh->datalen - frag_number;
2567 | new_fh->flags &= ~FD_DATALEN_SET0x0400;
2568 | new_fh->datalen = 0;
2569 | }
2570 | /* If we've moved all the fragments,
2571 | * delete the old head */
2572 | if (new_fh->next == NULL((void*)0)) {
2573 | old_tvb_data = fragment_delete(table, pinfo, id-frag_number, data);
2574 | if (old_tvb_data)
2575 | tvb_free(old_tvb_data);
2576 | }
2577 | } else {
2578 | /* Look forward and take off the next (this is
2579 | * necessary in some edge cases where max_frags
2580 | * prevented some fragments from going on the
2581 | * previous First, but they can go on this one. */
2582 | fragment_add_seq_single_move(table, pinfo, id,
2583 | data, tmp_offset);
2584 | }
2585 | }
2586 | frag_number = 0; /* For the rest of the function */
2587 | } else {
2588 | for (frag_number=1; frag_number < max_frags; frag_number++) {
2589 | fh = lookup_fd_head(table, pinfo, id-frag_number, data, NULL((void*)0));
2590 | if ((flags & REASSEMBLE_FLAGS_AGING0x0001) &&
2591 | fh && ((fh->frame + max_age) < pinfo->num)) {
2592 | old_tvb_data = fragment_delete(table, pinfo, id-frag_number, data);
2593 | if (old_tvb_data)
2594 | tvb_free(old_tvb_data);
2595 | fh = NULL((void*)0);
2596 | }
2597 | if (fh != NULL((void*)0)) {
2598 | if (fh->flags & FD_DATALEN_SET0x0400 &&
2599 | fh->datalen < frag_number) {
2600 | /* This fragment is after the Last
2601 | * fragment, so must go after here. */
2602 | fh = NULL((void*)0);
2603 | }
2604 | break;
2605 | }
2606 | }
2607 | if (fh == NULL((void*)0)) { /* Didn't find location, use default */
2608 | frag_number = 1;
2609 | /* Already looked for frag_number 1, so just create */
2610 | fh = new_head(FD_BLOCKSEQUENCE0x0100);
2611 | insert_fd_head(table, fh, pinfo, id-frag_number, data);
2612 | }
2613 | }
2614 | if (last) {
2615 | /* Look for fragments past the end set by this Last fragment. */
2616 | prev_fd = NULL((void*)0);
2617 | for (fd=fh->next; fd && fd->offset <= frag_number; fd=fd->next) {
2618 | prev_fd = fd;
2619 | }
2620 | /* fd is now all fragments offset > frag_number (the Last).
2621 | * It shouldn't have a fragment with offset frag_number+1,
2622 | * as that would be a First fragment not marked as such.
2623 | * However, this can happen if we had unreassembled fragments
2624 | * (missing, or at the start of the capture) and we've also
2625 | * looped around on the sequence numbers. It can also happen
2626 | * if bit errors mess up Last or First. */
2627 | if (fd != NULL((void*)0)) {
2628 | if (prev_fd) {
2629 | prev_fd->next = NULL((void*)0);
2630 | } else {
2631 | fh->next = NULL((void*)0);
2632 | }
2633 | fragment_items_removed(fh, prev_fd);
2634 | fh->frame = 0;
2635 | for (prev_fd=fh->next; prev_fd; prev_fd=prev_fd->next) {
2636 | if (fh->frame < prev_fd->frame) {
2637 | fh->frame = prev_fd->frame;
2638 | }
2639 | }
2640 | while (fd && fd->offset == frag_number+1) {
2641 | /* Definitely have bad data here. Best to
2642 | * delete these and leave unreassembled. */
2643 | fragment_item *tmp_fd;
2644 | tmp_fd=fd->next;
2645 |
2646 | if (fd->tvb_data && !(fd->flags & FD_SUBSET_TVB0x0020))
2647 | tvb_free(fd->tvb_data);
2648 | g_slice_free(fragment_item, fd)do { if (1) g_slice_free1 (sizeof (fragment_item), (fd)); else (void) ((fragment_item*) 0 == (fd)); } while (0);
2649 | fd=tmp_fd;
2650 | }
2651 | }
2652 | if (fd != NULL((void*)0)) {
2653 | /* Move these onto the next frame. */
2654 | new_fh = lookup_fd_head(table, pinfo, id+1, data, NULL((void*)0));
2655 | if (new_fh==NULL((void*)0)) {
2656 | /* Not found. Create list-head. */
2657 | new_fh = new_head(FD_BLOCKSEQUENCE0x0100);
2658 | insert_fd_head(table, new_fh, pinfo, id+1, data);
2659 | }
2660 | tmp_offset = 0;
2661 | for (prev_fd = fd; prev_fd; prev_fd = prev_fd->next) {
2662 | prev_fd->offset -= (frag_number+1);
2663 | tmp_offset = prev_fd->offset;
2664 | if (new_fh->frame < fd->frame) {
2665 | new_fh->frame = fd->frame;
2666 | }
2667 | }
2668 | MERGE_FRAG(new_fh, fd);
2669 | /* If we previously found a different Last fragment,
2670 | * transfer that information to the new reassembly. */
2671 | if (fh->flags & FD_DATALEN_SET0x0400 &&
2672 | fh->datalen > frag_number) {
2673 | new_fh->flags |= FD_DATALEN_SET0x0400;
2674 | new_fh->datalen = fh->datalen - (frag_number+1);
2675 | fh->flags &= ~FD_DATALEN_SET0x0400;
2676 | fh->datalen = 0;
2677 | } else {
2678 | /* Look forward and take off the next (this is
2679 | * necessary in some edge cases where max_frags
2680 | * prevented some fragments from going on the
2681 | * previous First, but they can go on this one. */
2682 | fragment_add_seq_single_move(table, pinfo, id+1,
2683 | data, tmp_offset);
2684 | }
2685 | }
2686 | } else {
2687 | fragment_add_seq_single_move(table, pinfo, id-frag_number, data,
2688 | frag_number+1);
2689 | }
2690 | /* Having cleaned up everything, finally ready to add our new
2691 | * fragment. Note that only this will ever complete a reassembly. */
2692 | fh = fragment_add_seq_common(table, tvb, offset, pinfo,
2693 | id-frag_number, data,
2694 | frag_number, frag_data_len,
2695 | !last, 0, &orig_key);
2696 | if (fh) {
2697 | /*
2698 | * Reassembly is complete.
2699 | *
2700 | * If this is in the table of in-progress reassemblies,
2701 | * remove it from that table. (It could be that this
2702 | * was the first and last fragment, so that no
2703 | * reassembly was done.)
2704 | */
2705 | if (orig_key != NULL((void*)0))
2706 | fragment_unhash(table, orig_key);
2707 |
2708 | /*
2709 | * Add this item to the table of reassembled packets.
2710 | */
2711 | fragment_reassembled_single(table, fh, pinfo, id-frag_number);
2712 | return fh;
2713 | } else {
2714 | /*
2715 | * Reassembly isn't complete.
2716 | */
2717 | return NULL((void*)0);
2718 | }
2719 | }
2720 |
2721 | fragment_head *
2722 | fragment_add_seq_single(reassembly_table *table, tvbuff_t *tvb,
2723 | const int offset, const packet_info *pinfo,
2724 | const uint32_t id, const void* data,
2725 | const uint32_t frag_data_len,
2726 | const bool_Bool first, const bool_Bool last,
2727 | const uint32_t max_frags)
2728 | {
2729 | return fragment_add_seq_single_work(table, tvb, offset, pinfo,
2730 | id, data, frag_data_len,
2731 | first, last, max_frags, 0, 0);
2732 | }
2733 |
2734 | fragment_head *
2735 | fragment_add_seq_single_aging(reassembly_table *table, tvbuff_t *tvb,
2736 | const int offset, const packet_info *pinfo,
2737 | const uint32_t id, const void* data,
2738 | const uint32_t frag_data_len,
2739 | const bool_Bool first, const bool_Bool last,
2740 | const uint32_t max_frags, const uint32_t max_age)
2741 | {
2742 | return fragment_add_seq_single_work(table, tvb, offset, pinfo,
2743 | id, data, frag_data_len,
2744 | first, last, max_frags, max_age,
2745 | REASSEMBLE_FLAGS_AGING0x0001);
2746 | }
2747 |
2748 | void
2749 | fragment_start_seq_check(reassembly_table *table, const packet_info *pinfo,
2750 | const uint32_t id, const void *data,
2751 | const uint32_t tot_len)
2752 | {
2753 | fragment_head *fd_head;
2754 |
2755 | /* Have we already seen this frame ?*/
2756 | if (pinfo->fd->visited) {
2757 | return;
2758 | }
2759 |
2760 | /* Check if fragment data exists */
2761 | fd_head = lookup_fd_head(table, pinfo, id, data, NULL((void*)0));
2762 |
2763 | if (fd_head == NULL((void*)0)) {
2764 | /* Create list-head. */
2765 | fd_head = g_slice_new(fragment_head)((fragment_head*) g_slice_alloc (sizeof (fragment_head)));
2766 | fd_head->next = NULL((void*)0);
2767 | fd_head->first_gap = NULL((void*)0);
2768 | fd_head->contiguous_len = 0;
2769 | fd_head->frame = 0;
2770 | fd_head->len = 0;
2771 | fd_head->fragment_nr_offset = 0;
2772 | fd_head->datalen = tot_len;
2773 | fd_head->reassembled_in = 0;
2774 | fd_head->reas_in_layer_num = 0;
2775 | fd_head->flags = FD_BLOCKSEQUENCE0x0100|FD_DATALEN_SET0x0400;
2776 | fd_head->tvb_data = NULL((void*)0);
2777 | fd_head->error = NULL((void*)0);
2778 |
2779 | insert_fd_head(table, fd_head, pinfo, id, data);
2780 | }
2781 | }
2782 |
2783 | fragment_head *
2784 | fragment_end_seq_next(reassembly_table *table, const packet_info *pinfo,
2785 | const uint32_t id, const void *data)
2786 | {
2787 | reassembled_key reass_key;
2788 | reassembled_key *new_key;
2789 | fragment_head *fd_head;
2790 | fragment_item *fd;
2791 | void *orig_key;
2792 | uint32_t max_offset = 0;
2793 |
2794 | /*
2795 | * Have we already seen this frame?
2796 | * If so, look for it in the table of reassembled packets.
2797 | */
2798 | if (pinfo->fd->visited) {
1 | Assuming field 'visited' is 0 | →
2 | ← | Taking false branch | →
2799 | reass_key.frame = pinfo->num;
2800 | reass_key.id = id;
2801 | return (fragment_head *)g_hash_table_lookup(table->reassembled_table, &reass_key);
2802 | }
2803 |
2804 | fd_head = lookup_fd_head(table, pinfo, id, data, &orig_key);
2805 |
2806 | if (fd_head) {
3 | ← | Assuming 'fd_head' is non-null | →
4 | ← | Taking true branch | →
2807 | for (fd = fd_head->next; fd; fd = fd->next) {
5 | ← | Loop condition is false. Execution continues on line 2812 | →
2808 | if (fd->offset > max_offset) {
2809 | max_offset = fd->offset;
2810 | }
2811 | }
2812 | fd_head->datalen = max_offset;
2813 | fd_head->flags |= FD_DATALEN_SET0x0400;
2814 |
2815 | fragment_defragment_and_free (fd_head, pinfo);
6 | ← | Calling 'fragment_defragment_and_free' | →
2816 |
2817 | /*
2818 | * Remove this from the table of in-progress reassemblies,
2819 | * and free up any memory used for it in that table.
2820 | */
2821 | fragment_unhash(table, orig_key);
2822 |
2823 | /*
2824 | * Add this item to the table of reassembled packets.
2825 | */
2826 | fragment_reassembled(table, fd_head, pinfo, id);
2827 | if (fd_head->next != NULL((void*)0)) {
2828 | new_key = g_slice_new(reassembled_key)((reassembled_key*) g_slice_alloc (sizeof (reassembled_key)));
2829 | new_key->frame = pinfo->num;
2830 | new_key->id = id;
2831 | reassembled_table_insert(table->reassembled_table, new_key, fd_head);
2832 | }
2833 |
2834 | return fd_head;
2835 | } else {
2836 | /*
2837 | * Fragment data not found.
2838 | */
2839 | return NULL((void*)0);
2840 | }
2841 | }
2842 |
2843 | /*
2844 | * Process reassembled data; if we're on the frame in which the data
2845 | * was reassembled, put the fragment information into the protocol
2846 | * tree, and construct a tvbuff with the reassembled data, otherwise
2847 | * just put a "reassembled in" item into the protocol tree.
2848 | * offset from start of tvb, result up to end of tvb
2849 | */
2850 | tvbuff_t *
2851 | process_reassembled_data(tvbuff_t *tvb, const int offset, packet_info *pinfo,
2852 | const char *name, fragment_head *fd_head, const fragment_items *fit,
2853 | bool_Bool *update_col_infop, proto_tree *tree)
2854 | {
2855 | tvbuff_t *next_tvb;
2856 | bool_Bool update_col_info;
2857 | proto_item *frag_tree_item;
2858 |
2859 | if (fd_head != NULL((void*)0) && pinfo->num == fd_head->reassembled_in && pinfo->curr_layer_num == fd_head->reas_in_layer_num) {
2860 | /*
2861 | * OK, we've reassembled this.
2862 | * Is this something that's been reassembled from more
2863 | * than one fragment?
2864 | */
2865 | if (fd_head->next != NULL((void*)0)) {
2866 | /*
2867 | * Yes.
2868 | * Allocate a new tvbuff, referring to the
2869 | * reassembled payload, and set
2870 | * the tvbuff to the list of tvbuffs to which
2871 | * the tvbuff we were handed refers, so it'll get
2872 | * cleaned up when that tvbuff is cleaned up.
2873 | */
2874 | next_tvb = tvb_new_chain(tvb, fd_head->tvb_data);
2875 |
2876 | /* Add the defragmented data to the data source list. */
2877 | add_new_data_source(pinfo, next_tvb, name);
2878 |
2879 | /* show all fragments */
2880 | if (fd_head->flags & FD_BLOCKSEQUENCE0x0100) {
2881 | update_col_info = !show_fragment_seq_tree(
2882 | fd_head, fit, tree, pinfo, next_tvb, &frag_tree_item);
2883 | } else {
2884 | update_col_info = !show_fragment_tree(fd_head,
2885 | fit, tree, pinfo, next_tvb, &frag_tree_item);
2886 | }
2887 | } else {
2888 | /*
2889 | * No.
2890 | * Return a tvbuff with the payload, a subset of the
2891 | * tvbuff passed in. (The dissector SHOULD pass in
2892 | * the correct tvbuff and offset.)
2893 | */
2894 | int len;
2895 | /* For FD_BLOCKSEQUENCE, len is the length in bytes,
2896 | * datalen is the number of fragments.
2897 | */
2898 | if (fd_head->flags & FD_BLOCKSEQUENCE0x0100) {
2899 | len = fd_head->len;
2900 | } else {
2901 | // XXX Do the non-seq functions have this optimization?
2902 | len = fd_head->datalen;
2903 | }
2904 | next_tvb = tvb_new_subset_length(tvb, offset, len);
2905 | pinfo->fragmented = false0; /* one-fragment packet */
2906 | update_col_info = true1;
2907 | }
2908 | if (update_col_infop != NULL((void*)0))
2909 | *update_col_infop = update_col_info;
2910 | } else {
2911 | /*
2912 | * We don't have the complete reassembled payload, or this
2913 | * isn't the final frame of that payload.
2914 | */
2915 | next_tvb = NULL((void*)0);
2916 |
2917 | /*
2918 | * If we know what frame this was reassembled in,
2919 | * and if there's a field to use for the number of
2920 | * the frame in which the packet was reassembled,
2921 | * add it to the protocol tree.
2922 | */
2923 | if (fd_head != NULL((void*)0) && fit->hf_reassembled_in != NULL((void*)0)) {
2924 | proto_item *fei = proto_tree_add_uint(tree,
2925 | *(fit->hf_reassembled_in), tvb,
2926 | 0, 0, fd_head->reassembled_in);
2927 | proto_item_set_generated(fei);
2928 | }
2929 | }
2930 | return next_tvb;
2931 | }
2932 |
2933 | /*
2934 | * Show a single fragment in a fragment subtree, and put information about
2935 | * it in the top-level item for that subtree.
2936 | */
2937 | static void
2938 | show_fragment(fragment_item *fd, const int offset, const fragment_items *fit,
2939 | proto_tree *ft, proto_item *fi, const bool_Bool first_frag,
2940 | const uint32_t count, tvbuff_t *tvb, packet_info *pinfo)
2941 | {
2942 | proto_item *fei=NULL((void*)0);
2943 | int hf;
2944 |
2945 | if (first_frag) {
2946 | char *name;
2947 | if (count == 1) {
2948 | name = g_strdup(proto_registrar_get_name(*(fit->hf_fragment)))g_strdup_inline (proto_registrar_get_name(*(fit->hf_fragment )));
2949 | } else {
2950 | name = g_strdup(proto_registrar_get_name(*(fit->hf_fragments)))g_strdup_inline (proto_registrar_get_name(*(fit->hf_fragments )));
2951 | }
2952 | proto_item_set_text(fi, "%u %s (%u byte%s): ", count, name, tvb_captured_length(tvb),
2953 | plurality(tvb_captured_length(tvb), "", "s")((tvb_captured_length(tvb)) == 1 ? ("") : ("s")));
2954 | g_free(name);
2955 | } else {
2956 | proto_item_append_text(fi, ", ");
2957 | }
2958 | proto_item_append_text(fi, "#%u(%u)", fd->frame, fd->len);
2959 |
2960 | if (fd->flags & (FD_OVERLAPCONFLICT0x0004
2961 | |FD_MULTIPLETAILS0x0008|FD_TOOLONGFRAGMENT0x0010) ) {
2962 | hf = *(fit->hf_fragment_error);
2963 | } else {
2964 | hf = *(fit->hf_fragment);
2965 | }
2966 | if (fd->len == 0) {
2967 | fei = proto_tree_add_uint_format(ft, hf,
2968 | tvb, offset, fd->len,
2969 | fd->frame,
2970 | "Frame: %u (no data)",
2971 | fd->frame);
2972 | } else {
2973 | fei = proto_tree_add_uint_format(ft, hf,
2974 | tvb, offset, fd->len,
2975 | fd->frame,
2976 | "Frame: %u, payload: %u-%u (%u byte%s)",
2977 | fd->frame,
2978 | offset,
2979 | offset+fd->len-1,
2980 | fd->len,
2981 | plurality(fd->len, "", "s")((fd->len) == 1 ? ("") : ("s")));
2982 | }
2983 | proto_item_set_generated(fei);
2984 | mark_frame_as_depended_upon(pinfo->fd, fd->frame);
2985 | if (fd->flags & (FD_OVERLAP0x0002|FD_OVERLAPCONFLICT0x0004
2986 | |FD_MULTIPLETAILS0x0008|FD_TOOLONGFRAGMENT0x0010) ) {
2987 | /* this fragment has some flags set, create a subtree
2988 | * for it and display the flags.
2989 | */
2990 | proto_tree *fet=NULL((void*)0);
2991 |
2992 | fet = proto_item_add_subtree(fei, *(fit->ett_fragment));
2993 | if (fd->flags&FD_OVERLAP0x0002) {
2994 | fei=proto_tree_add_boolean(fet,
2995 | *(fit->hf_fragment_overlap),
2996 | tvb, 0, 0,
2997 | true1);
2998 | proto_item_set_generated(fei);
2999 | }
3000 | if (fd->flags&FD_OVERLAPCONFLICT0x0004) {
3001 | fei=proto_tree_add_boolean(fet,
3002 | *(fit->hf_fragment_overlap_conflict),
3003 | tvb, 0, 0,
3004 | true1);
3005 | proto_item_set_generated(fei);
3006 | }
3007 | if (fd->flags&FD_MULTIPLETAILS0x0008) {
3008 | fei=proto_tree_add_boolean(fet,
3009 | *(fit->hf_fragment_multiple_tails),
3010 | tvb, 0, 0,
3011 | true1);
3012 | proto_item_set_generated(fei);
3013 | }
3014 | if (fd->flags&FD_TOOLONGFRAGMENT0x0010) {
3015 | fei=proto_tree_add_boolean(fet,
3016 | *(fit->hf_fragment_too_long_fragment),
3017 | tvb, 0, 0,
3018 | true1);
3019 | proto_item_set_generated(fei);
3020 | }
3021 | }
3022 | }
3023 |
3024 | static bool_Bool
3025 | show_fragment_errs_in_col(fragment_head *fd_head, const fragment_items *fit,
3026 | packet_info *pinfo)
3027 | {
3028 | if (fd_head->flags & (FD_OVERLAPCONFLICT0x0004
3029 | |FD_MULTIPLETAILS0x0008|FD_TOOLONGFRAGMENT0x0010) ) {
3030 | col_add_fstr(pinfo->cinfo, COL_INFO, "[Illegal %s]", fit->tag);
3031 | return true1;
3032 | }
3033 |
3034 | return false0;
3035 | }
3036 |
3037 | /* This function will build the fragment subtree; it's for fragments
3038 | reassembled with "fragment_add()".
3039 |
3040 | It will return true if there were fragmentation errors
3041 | or false if fragmentation was ok.
3042 | */
3043 | bool_Bool
3044 | show_fragment_tree(fragment_head *fd_head, const fragment_items *fit,
3045 | proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, proto_item **fi)
3046 | {
3047 | fragment_item *fd;
3048 | proto_tree *ft;
3049 | bool_Bool first_frag;
3050 | uint32_t count = 0;
3051 | /* It's not fragmented. */
3052 | pinfo->fragmented = false0;
3053 |
3054 | *fi = proto_tree_add_item(tree, *(fit->hf_fragments), tvb, 0, -1, ENC_NA0x00000000);
3055 | proto_item_set_generated(*fi);
3056 |
3057 | ft = proto_item_add_subtree(*fi, *(fit->ett_fragments));
3058 | first_frag = true1;
3059 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next) {
3060 | count++;
3061 | }
3062 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next) {
3063 | show_fragment(fd, fd->offset, fit, ft, *fi, first_frag, count, tvb, pinfo);
3064 | first_frag = false0;
3065 | }
3066 |
3067 | if (fit->hf_fragment_count) {
3068 | proto_item *fli = proto_tree_add_uint(ft, *(fit->hf_fragment_count),
3069 | tvb, 0, 0, count);
3070 | proto_item_set_generated(fli);
3071 | }
3072 |
3073 | if (fit->hf_reassembled_length) {
3074 | proto_item *fli = proto_tree_add_uint(ft, *(fit->hf_reassembled_length),
3075 | tvb, 0, 0, tvb_captured_length (tvb));
3076 | proto_item_set_generated(fli);
3077 | }
3078 |
3079 | if (fit->hf_reassembled_data) {
3080 | proto_item *fli = proto_tree_add_item(ft, *(fit->hf_reassembled_data),
3081 | tvb, 0, tvb_captured_length(tvb), ENC_NA0x00000000);
3082 | proto_item_set_generated(fli);
3083 | }
3084 |
3085 | return show_fragment_errs_in_col(fd_head, fit, pinfo);
3086 | }
3087 |
3088 | /* This function will build the fragment subtree; it's for fragments
3089 | reassembled with "fragment_add_seq()" or "fragment_add_seq_check()".
3090 |
3091 | It will return true if there were fragmentation errors
3092 | or false if fragmentation was ok.
3093 | */
3094 | bool_Bool
3095 | show_fragment_seq_tree(fragment_head *fd_head, const fragment_items *fit,
3096 | proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, proto_item **fi)
3097 | {
3098 | uint32_t offset, next_offset, count = 0;
3099 | fragment_item *fd, *last_fd;
3100 | proto_tree *ft;
3101 | bool_Bool first_frag;
3102 |
3103 | /* It's not fragmented. */
3104 | pinfo->fragmented = false0;
3105 |
3106 | *fi = proto_tree_add_item(tree, *(fit->hf_fragments), tvb, 0, -1, ENC_NA0x00000000);
3107 | proto_item_set_generated(*fi);
3108 |
3109 | ft = proto_item_add_subtree(*fi, *(fit->ett_fragments));
3110 | offset = 0;
3111 | next_offset = 0;
3112 | last_fd = NULL((void*)0);
3113 | first_frag = true1;
3114 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next){
3115 | count++;
3116 | }
3117 | for (fd = fd_head->next; fd != NULL((void*)0); fd = fd->next){
3118 | if (last_fd == NULL((void*)0) || last_fd->offset != fd->offset) {
3119 | offset = next_offset;
3120 | next_offset += fd->len;
3121 | }
3122 | last_fd = fd;
3123 | show_fragment(fd, offset, fit, ft, *fi, first_frag, count, tvb, pinfo);
3124 | first_frag = false0;
3125 | }
3126 |
3127 | if (fit->hf_fragment_count) {
3128 | proto_item *fli = proto_tree_add_uint(ft, *(fit->hf_fragment_count),
3129 | tvb, 0, 0, count);
3130 | proto_item_set_generated(fli);
3131 | }
3132 |
3133 | if (fit->hf_reassembled_length) {
3134 | proto_item *fli = proto_tree_add_uint(ft, *(fit->hf_reassembled_length),
3135 | tvb, 0, 0, tvb_captured_length (tvb));
3136 | proto_item_set_generated(fli);
3137 | }
3138 |
3139 | if (fit->hf_reassembled_data) {
3140 | proto_item *fli = proto_tree_add_item(ft, *(fit->hf_reassembled_data),
3141 | tvb, 0, tvb_captured_length(tvb), ENC_NA0x00000000);
3142 | proto_item_set_generated(fli);
3143 | }
3144 |
3145 | return show_fragment_errs_in_col(fd_head, fit, pinfo);
3146 | }
3147 |
3148 | static void
3149 | reassembly_table_init_reg_table(void *p, void *user_data _U___attribute__((unused)))
3150 | {
3151 | register_reassembly_table_t* reg_table = (register_reassembly_table_t*)p;
3152 | reassembly_table_init(reg_table->table, reg_table->funcs);
3153 | }
3154 |
3155 | static void
3156 | reassembly_table_init_reg_tables(void)
3157 | {
3158 | g_list_foreach(reassembly_table_list, reassembly_table_init_reg_table, NULL((void*)0));
3159 | }
3160 |
3161 | static void
3162 | reassembly_table_cleanup_reg_table(void *p, void *user_data _U___attribute__((unused)))
3163 | {
3164 | register_reassembly_table_t* reg_table = (register_reassembly_table_t*)p;
3165 | reassembly_table_destroy(reg_table->table);
3166 | }
3167 |
3168 | static void
3169 | reassembly_table_cleanup_reg_tables(void)
3170 | {
3171 | g_list_foreach(reassembly_table_list, reassembly_table_cleanup_reg_table, NULL((void*)0));
3172 | }
3173 |
3174 | void reassembly_tables_init(void)
3175 | {
3176 | register_init_routine(&reassembly_table_init_reg_tables);
3177 | register_cleanup_routine(&reassembly_table_cleanup_reg_tables);
3178 | }
3179 |
3180 | static void
3181 | reassembly_table_free(void *p, void *user_data _U___attribute__((unused)))
3182 | {
3183 | register_reassembly_table_t* reg_table = (register_reassembly_table_t*)p;
3184 | reassembly_table_destroy(reg_table->table);
3185 | g_free(reg_table);
3186 | }
3187 |
3188 | void
3189 | reassembly_table_cleanup(void)
3190 | {
3191 | g_list_foreach(reassembly_table_list, reassembly_table_free, NULL((void*)0));
3192 | g_list_free(reassembly_table_list);
3193 | }
3194 |
3195 | /* One instance of this structure is created for each pdu that spans across
3196 | * multiple segments. (MSP) */
3197 | typedef struct _multisegment_pdu_t {
3198 | uint64_t first_frame;
3199 | uint64_t last_frame;
3200 | unsigned start_offset_at_first_frame;
3201 | unsigned end_offset_at_last_frame;
3202 | int length; /* length of this MSP */
3203 | uint32_t streaming_reassembly_id;
3204 | /* pointer to previous multisegment_pdu */
3205 | struct _multisegment_pdu_t* prev_msp;
3206 | } multisegment_pdu_t;
3207 |
3208 | /* struct for keeping the reassembly information of each stream */
3209 | struct streaming_reassembly_info_t {
3210 | /* This map is keyed by frame num and keeps track of all MSPs for this
3211 | * stream. Different frames will point to the same MSP if they contain
3212 | * part data of this MSP. If a frame contains data that
3213 | * belongs to two MSPs, it will point to the second MSP. */
3214 | wmem_map_t* multisegment_pdus;
3215 | /* This map is keyed by frame num and keeps track of the frag_offset
3216 | * of the first byte of frames for fragment_add() after first scan. */
3217 | wmem_map_t* frame_num_frag_offset_map;
3218 | /* how many bytes the current uncompleted MSP still needs. (only valid for first scan) */
3219 | int prev_deseg_len;
3220 | /* the current uncompleted MSP (only valid for first scan) */
3221 | multisegment_pdu_t* last_msp;
3222 | };
3223 |
3224 | static uint32_t
3225 | create_streaming_reassembly_id(void)
3226 | {
3227 | static uint32_t global_streaming_reassembly_id = 0;
3228 | return ++global_streaming_reassembly_id;
3229 | }
3230 |
3231 | streaming_reassembly_info_t*
3232 | streaming_reassembly_info_new(void)
3233 | {
3234 | return wmem_new0(wmem_file_scope(), streaming_reassembly_info_t)((streaming_reassembly_info_t*)wmem_alloc0((wmem_file_scope() ), sizeof(streaming_reassembly_info_t)));
3235 | }
3236 |
3237 | /* Following is an example of ProtoA and ProtoB protocols from the declaration of this function in 'reassemble.h':
3238 | *
3239 | * +------------------ A Multisegment PDU of ProtoB ----------------------+
3240 | * | |
3241 | * +--- ProtoA payload1 ---+ +- payload2 -+ +- Payload3 -+ +- Payload4 -+ +- ProtoA payload5 -+
3242 | * | EoMSP | OmNFP | BoMSP | | MoMSP | | MoMSP | | MoMSP | | EoMSP | BoMSP |
3243 | * +-------+-------+-------+ +------------+ +------------+ +------------+ +---------+---------+
3244 | * | |
3245 | * +----------------------------------------------------------------------+
3246 | *
3247 | * For a ProtoA payload composed of EoMSP + OmNFP + BoMSP will call fragment_add() twice on EoMSP and BoMSP; and call
3248 | * process_reassembled_data() once for generating tvb of a MSP to which EoMSP belongs; and call subdissector twice on
3249 | * reassembled MSP of EoMSP and OmNFP + BoMSP. After that finds BoMSP is a beginning of a MSP at first scan.
3250 | *
3251 | * The rules are:
3252 | *
3253 | * - If a ProtoA payload contains EoMSP, we will need call fragment_add(), process_reassembled_data() and subdissector
3254 | * once on it to end a MSP. (May run twice or more times at first scan, because subdissector may only return the
3255 | * head length of message by pinfo->desegment_len. We need run second time for subdissector to determine the length
3256 | * of entire message).
3257 | *
3258 | * - If a ProtoA payload contains OmNFP, we will need only call subdissector once on it. The subdissector need dissect
3259 | * all non-fragment PDUs in it. (no desegment_len should output)
3260 | *
3261 | * - If a ProtoA payload contains BoMSP, we will need call subdissector once on BoMSP or OmNFP+BoMSP (because unknown
3262 | * during first scan). The subdissector will output desegment_len (!= 0). Then we will call fragment_add()
3263 | * with a new reassembly id on BoMSP for starting a new MSP.
3264 | *
3265 | * - If a ProtoA payload only contains MoMSP (entire payload is part of a MSP), we will only call fragment_add() once
3266 | * or twice (at first scan) on it. The subdissector will not be called.
3267 | *
3268 | * In this implementation, only multisegment PDUs are recorded in multisegment_pdus map keyed by the numbers (uint64_t)
3269 | * of frames belongs to MSPs. Each MSP in the map has a pointer referred to previous MSP, because we may need
3270 | * two MSPs to dissect a ProtoA payload that contains EoMSP + BoMSP at the same time. The multisegment_pdus map is built
3271 | * during first scan (pinfo->visited == false) with help of prev_deseg_len and last_msp fields of streaming_reassembly_info_t
3272 | * for each direction of a ProtoA STREAM. The prev_deseg_len record how many bytes of subsequent ProtoA payloads belong to
3273 | * previous PDU during first scan. The last_msp member of streaming_reassembly_info_t is always point to last MSP which
3274 | * is created during scan previous or early ProtoA payloads. Since subdissector might return only the head length of entire
3275 | * message (by pinfo->desegment_len) when there is not enough data to determine the message length, we need to reopen
3276 | * reassembly fragments for adding more bytes during scanning the next ProtoA payload. We have to use fragment_add()
3277 | * instead of fragment_add_check() or fragment_add_seq_next().
3278 | *
3279 | * Read more: please refer to comments of the declaration of this function in 'reassemble.h'.
3280 | */
3281 | int
3282 | reassemble_streaming_data_and_call_subdissector(
3283 | tvbuff_t* tvb, packet_info* pinfo, unsigned offset, int length,
3284 | proto_tree* segment_tree, proto_tree* reassembled_tree, reassembly_table streaming_reassembly_table,
3285 | streaming_reassembly_info_t* reassembly_info, uint64_t cur_frame_num,
3286 | dissector_handle_t subdissector_handle, proto_tree* subdissector_tree, void* subdissector_data,
3287 | const char* label, const fragment_items* frag_hf_items, int hf_segment_data
3288 | )
3289 | {
3290 | int orig_length = length;
3291 | int datalen = 0;
3292 | int bytes_belong_to_prev_msp = 0; /* bytes belong to previous MSP */
3293 | uint32_t reassembly_id = 0, frag_offset = 0;
3294 | fragment_head* head = NULL((void*)0);
3295 | bool_Bool need_more = false0;
3296 | bool_Bool found_BoMSP = false0;
3297 | multisegment_pdu_t* cur_msp = NULL((void*)0), * prev_msp = NULL((void*)0);
3298 | uint16_t save_can_desegment;
3299 | int save_desegment_offset;
3300 | uint32_t save_desegment_len;
3301 | uint64_t* frame_ptr;
3302 |
3303 | save_can_desegment = pinfo->can_desegment;
3304 | save_desegment_offset = pinfo->desegment_offset;
3305 | save_desegment_len = pinfo->desegment_len;
3306 |
3307 | /* calculate how many bytes of this payload belongs to previous MSP (EoMSP) */
3308 | if (!PINFO_FD_VISITED(pinfo)((pinfo)->fd->visited)) {
3309 | /* this is first scan */
3310 | if (reassembly_info->prev_deseg_len == DESEGMENT_ONE_MORE_SEGMENT0x0fffffff) {
3311 | /* assuming the entire tvb belongs to the previous MSP */
3312 | bytes_belong_to_prev_msp = length;
3313 | reassembly_info->prev_deseg_len = length;
3314 | } else if (reassembly_info->prev_deseg_len > 0) {
3315 | /* part or all of current payload belong to previous MSP */
3316 | bytes_belong_to_prev_msp = MIN(reassembly_info->prev_deseg_len, length)(((reassembly_info->prev_deseg_len) < (length)) ? (reassembly_info ->prev_deseg_len) : (length));
3317 | reassembly_info->prev_deseg_len -= bytes_belong_to_prev_msp;
3318 | need_more = (reassembly_info->prev_deseg_len > 0);
3319 | } /* else { beginning of a new PDU (might be a NFP or MSP) } */
3320 |
3321 | if (bytes_belong_to_prev_msp > 0) {
3322 | DISSECTOR_ASSERT(reassembly_info->last_msp != NULL)((void) ((reassembly_info->last_msp != ((void*)0)) ? (void )0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 3322, "reassembly_info->last_msp != ((void*)0)" ))));
3323 | reassembly_id = reassembly_info->last_msp->streaming_reassembly_id;
3324 | frag_offset = reassembly_info->last_msp->length;
3325 | if (reassembly_info->frame_num_frag_offset_map == NULL((void*)0)) {
3326 | reassembly_info->frame_num_frag_offset_map = wmem_map_new(wmem_file_scope(), g_int64_hash, g_int64_equal);
3327 | }
3328 | frame_ptr = (uint64_t*)wmem_memdup(wmem_file_scope(), &cur_frame_num, sizeof(uint64_t));
3329 | wmem_map_insert(reassembly_info->frame_num_frag_offset_map, frame_ptr, GUINT_TO_POINTER(frag_offset)((gpointer) (gulong) (frag_offset)));
3330 | /* This payload contains the data of previous msp, so we point to it. That may be overridden late. */
3331 | wmem_map_insert(reassembly_info->multisegment_pdus, frame_ptr, reassembly_info->last_msp);
3332 | }
3333 | } else {
3334 | /* not first scan, use information of multisegment_pdus built during first scan */
3335 | if (reassembly_info->multisegment_pdus) {
3336 | cur_msp = (multisegment_pdu_t*)wmem_map_lookup(reassembly_info->multisegment_pdus, &cur_frame_num);
3337 | }
3338 | if (cur_msp) {
3339 | if (cur_msp->first_frame == cur_frame_num) {
3340 | /* Current payload contains a beginning of a MSP. (BoMSP)
3341 | * The cur_msp contains information about the beginning MSP.
3342 | * If prev_msp is not null, that means this payload also contains
3343 | * the last part of previous MSP. (EoMSP) */
3344 | prev_msp = cur_msp->prev_msp;
3345 | } else {
3346 | /* Current payload is not a first frame of a MSP (not include BoMSP). */
3347 | prev_msp = cur_msp;
3348 | cur_msp = NULL((void*)0);
3349 | }
3350 | }
3351 |
3352 | if (prev_msp && prev_msp->last_frame >= cur_frame_num) {
3353 | if (prev_msp->last_frame == cur_frame_num) {
3354 | /* this payload contains part of previous MSP (contains EoMSP) */
3355 | bytes_belong_to_prev_msp = prev_msp->end_offset_at_last_frame - offset;
3356 | } else { /* if (prev_msp->last_frame > cur_frame_num) */
3357 | /* this payload all belongs to previous MSP */
3358 | bytes_belong_to_prev_msp = length;
3359 | need_more = true1;
3360 | }
3361 | reassembly_id = prev_msp->streaming_reassembly_id;
3362 | }
3363 | if (reassembly_info->frame_num_frag_offset_map) {
3364 | frag_offset = GPOINTER_TO_UINT(wmem_map_lookup(reassembly_info->frame_num_frag_offset_map, &cur_frame_num))((guint) (gulong) (wmem_map_lookup(reassembly_info->frame_num_frag_offset_map , &cur_frame_num)));
3365 | }
3366 | }
3367 |
3368 | /* handling EoMSP or MoMSP (entire payload being middle part of a MSP) */
3369 | while (bytes_belong_to_prev_msp > 0) {
3370 | tvbuff_t* reassembled_tvb = NULL((void*)0);
3371 | DISSECTOR_ASSERT(reassembly_id > 0)((void) ((reassembly_id > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 3371, "reassembly_id > 0"))));
3372 | pinfo->can_desegment = 2; /* this will be decreased one while passing to subdissector */
3373 | pinfo->desegment_offset = 0;
3374 | pinfo->desegment_len = 0;
3375 |
3376 | head = fragment_add(&streaming_reassembly_table, tvb, offset, pinfo, reassembly_id, NULL((void*)0),
3377 | frag_offset, bytes_belong_to_prev_msp, need_more);
3378 |
3379 | if (head) {
3380 | if (frag_hf_items->hf_reassembled_in) {
3381 | proto_item_set_generated(
3382 | proto_tree_add_uint(segment_tree, *(frag_hf_items->hf_reassembled_in), tvb, offset,
3383 | bytes_belong_to_prev_msp, head->reassembled_in)
3384 | );
3385 | }
3386 |
3387 | if (!need_more) {
3388 | reassembled_tvb = process_reassembled_data(tvb, offset, pinfo,
3389 | wmem_strdup_printf(pinfo->pool, "Reassembled %s", label),
3390 | head, frag_hf_items, NULL((void*)0), reassembled_tree);
3391 | }
3392 | }
3393 |
3394 | proto_tree_add_bytes_format(segment_tree, hf_segment_data, tvb, offset,
3395 | bytes_belong_to_prev_msp, NULL((void*)0), "%s Segment data (%u byte%s)", label,
3396 | bytes_belong_to_prev_msp, plurality(bytes_belong_to_prev_msp, "", "s")((bytes_belong_to_prev_msp) == 1 ? ("") : ("s")));
3397 |
3398 | if (reassembled_tvb) {
3399 | /* normally, this stage will dissect one or more completed pdus */
3400 | /* Note, don't call_dissector_with_data because sometime the pinfo->curr_layer_num will changed
3401 | * after calling that will make reassembly failed! */
3402 | call_dissector_only(subdissector_handle, reassembled_tvb, pinfo, subdissector_tree, subdissector_data);
3403 | }
3404 |
3405 | if (pinfo->desegment_len) {
3406 | /* that must only happen during first scan the reassembly_info->prev_deseg_len might be only the
3407 | * head length of entire message. */
3408 | DISSECTOR_ASSERT(!PINFO_FD_VISITED(pinfo))((void) ((!((pinfo)->fd->visited)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 3408, "!((pinfo)->fd->visited)"))));
3409 | DISSECTOR_ASSERT_HINT(pinfo->desegment_len != DESEGMENT_UNTIL_FIN, "Subdissector MUST NOT "((void) ((pinfo->desegment_len != 0x0ffffffe) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3411, "pinfo->desegment_len != 0x0ffffffe" , "Subdissector MUST NOT " "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to " " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined." ))))
3410 | "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to "((void) ((pinfo->desegment_len != 0x0ffffffe) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3411, "pinfo->desegment_len != 0x0ffffffe" , "Subdissector MUST NOT " "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to " " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined." ))))
3411 | " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined.")((void) ((pinfo->desegment_len != 0x0ffffffe) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3411, "pinfo->desegment_len != 0x0ffffffe" , "Subdissector MUST NOT " "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to " " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined." ))));
3412 |
3413 | if (pinfo->desegment_offset > 0) {
3414 | DISSECTOR_ASSERT_HINT(pinfo->desegment_offset > reassembly_info->last_msp->length((void) ((pinfo->desegment_offset > reassembly_info-> last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3418, "pinfo->desegment_offset > reassembly_info->last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp" , wmem_strdup_printf(pinfo->pool, "Subdissector MUST NOT set pinfo->desegment_offset(%d) in previous or next part of MSP, must between (%d, %d)." , pinfo->desegment_offset, reassembly_info->last_msp-> length, reassembly_info->last_msp->length + bytes_belong_to_prev_msp )))))
3415 | && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp,((void) ((pinfo->desegment_offset > reassembly_info-> last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3418, "pinfo->desegment_offset > reassembly_info->last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp" , wmem_strdup_printf(pinfo->pool, "Subdissector MUST NOT set pinfo->desegment_offset(%d) in previous or next part of MSP, must between (%d, %d)." , pinfo->desegment_offset, reassembly_info->last_msp-> length, reassembly_info->last_msp->length + bytes_belong_to_prev_msp )))))
3416 | wmem_strdup_printf(pinfo->pool,((void) ((pinfo->desegment_offset > reassembly_info-> last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3418, "pinfo->desegment_offset > reassembly_info->last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp" , wmem_strdup_printf(pinfo->pool, "Subdissector MUST NOT set pinfo->desegment_offset(%d) in previous or next part of MSP, must between (%d, %d)." , pinfo->desegment_offset, reassembly_info->last_msp-> length, reassembly_info->last_msp->length + bytes_belong_to_prev_msp )))))
3417 | "Subdissector MUST NOT set pinfo->desegment_offset(%d) in previous or next part of MSP, must between (%d, %d).",((void) ((pinfo->desegment_offset > reassembly_info-> last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3418, "pinfo->desegment_offset > reassembly_info->last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp" , wmem_strdup_printf(pinfo->pool, "Subdissector MUST NOT set pinfo->desegment_offset(%d) in previous or next part of MSP, must between (%d, %d)." , pinfo->desegment_offset, reassembly_info->last_msp-> length, reassembly_info->last_msp->length + bytes_belong_to_prev_msp )))))
3418 | pinfo->desegment_offset, reassembly_info->last_msp->length, reassembly_info->last_msp->length + bytes_belong_to_prev_msp))((void) ((pinfo->desegment_offset > reassembly_info-> last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3418, "pinfo->desegment_offset > reassembly_info->last_msp->length && pinfo->desegment_offset < reassembly_info->last_msp->length + bytes_belong_to_prev_msp" , wmem_strdup_printf(pinfo->pool, "Subdissector MUST NOT set pinfo->desegment_offset(%d) in previous or next part of MSP, must between (%d, %d)." , pinfo->desegment_offset, reassembly_info->last_msp-> length, reassembly_info->last_msp->length + bytes_belong_to_prev_msp )))));
3419 |
3420 | /* shorten the bytes_belong_to_prev_msp and just truncate the reassembled tvb */
3421 | bytes_belong_to_prev_msp = pinfo->desegment_offset - reassembly_info->last_msp->length;
3422 | fragment_truncate(&streaming_reassembly_table, pinfo, reassembly_id, NULL((void*)0), pinfo->desegment_offset);
3423 | found_BoMSP = true1;
3424 | } else {
3425 | if (pinfo->desegment_len == DESEGMENT_ONE_MORE_SEGMENT0x0fffffff) {
3426 | /* just need more bytes, all remaining bytes belongs to previous MSP (to run fragment_add again) */
3427 | bytes_belong_to_prev_msp = length;
3428 | }
3429 |
3430 | /* Remove the data added by previous fragment_add(), and reopen fragments for adding more bytes. */
3431 | fragment_truncate(&streaming_reassembly_table, pinfo, reassembly_id, NULL((void*)0), reassembly_info->last_msp->length);
3432 | fragment_set_partial_reassembly(&streaming_reassembly_table, pinfo, reassembly_id, NULL((void*)0));
3433 |
3434 | reassembly_info->prev_deseg_len = bytes_belong_to_prev_msp + pinfo->desegment_len;
3435 | bytes_belong_to_prev_msp = MIN(reassembly_info->prev_deseg_len, length)(((reassembly_info->prev_deseg_len) < (length)) ? (reassembly_info ->prev_deseg_len) : (length));
3436 | reassembly_info->prev_deseg_len -= bytes_belong_to_prev_msp;
3437 | need_more = (reassembly_info->prev_deseg_len > 0);
3438 | continue;
3439 | }
3440 | }
3441 |
3442 | if (pinfo->desegment_len == 0 || found_BoMSP) {
3443 | /* We will arrive here, only when the MSP is defragmented and dissected or this
3444 | * payload all belongs to previous MSP (only fragment_add() with need_more=true called)
3445 | * or BoMSP is parsed while pinfo->desegment_offset > 0 and pinfo->desegment_len != 0
3446 | */
3447 | offset += bytes_belong_to_prev_msp;
3448 | length -= bytes_belong_to_prev_msp;
3449 | DISSECTOR_ASSERT(length >= 0)((void) ((length >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 3449, "length >= 0"))));
3450 | if (!PINFO_FD_VISITED(pinfo)((pinfo)->fd->visited)) {
3451 | reassembly_info->last_msp->length += bytes_belong_to_prev_msp;
3452 | }
3453 |
3454 | if (!PINFO_FD_VISITED(pinfo)((pinfo)->fd->visited) && reassembled_tvb) {
3455 | /* completed current msp */
3456 | reassembly_info->last_msp->last_frame = cur_frame_num;
3457 | reassembly_info->last_msp->end_offset_at_last_frame = offset;
3458 | reassembly_info->prev_deseg_len = pinfo->desegment_len;
3459 | }
3460 | bytes_belong_to_prev_msp = 0; /* break */
3461 | }
3462 | }
3463 |
3464 | /* to find and handle OmNFP, and find BoMSP at first scan. */
3465 | if (length > 0 && !found_BoMSP) {
3466 | if (!PINFO_FD_VISITED(pinfo)((pinfo)->fd->visited)) {
3467 | /* It is first scan, to dissect remaining bytes to find whether it is OmNFP only, or BoMSP only or OmNFP + BoMSP. */
3468 | datalen = length;
3469 | DISSECTOR_ASSERT(cur_msp == NULL)((void) ((cur_msp == ((void*)0)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 3469, "cur_msp == ((void*)0)"))));
3470 | } else {
3471 | /* Not first scan */
3472 | if (cur_msp) {
3473 | /* There's a BoMSP. Let's calculate the length of OmNFP between EoMSP and BoMSP */
3474 | datalen = cur_msp->start_offset_at_first_frame - offset; /* if result is zero that means no OmNFP */
3475 | } else {
3476 | /* This payload is not a beginning of MSP. The remaining bytes all belong to OmNFP without BoMSP */
3477 | datalen = length;
3478 | }
3479 | }
3480 | DISSECTOR_ASSERT(datalen >= 0)((void) ((datalen >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 3480, "datalen >= 0"))));
3481 |
3482 | /* Dissect the remaining of this payload. If (datalen == 0) means remaining only have one BoMSP without OmNFP. */
3483 | if (datalen > 0) {
3484 | /* we dissect if it is not dissected before or it is a non-fragment pdu (between two multisegment pdus) */
3485 | pinfo->can_desegment = 2;
3486 | pinfo->desegment_offset = 0;
3487 | pinfo->desegment_len = 0;
3488 |
3489 | call_dissector_only(subdissector_handle, tvb_new_subset_length(tvb, offset, datalen),
3490 | pinfo, subdissector_tree, subdissector_data);
3491 |
3492 | if (pinfo->desegment_len) {
3493 | DISSECTOR_ASSERT_HINT(pinfo->desegment_len != DESEGMENT_UNTIL_FIN, "Subdissector MUST NOT "((void) ((pinfo->desegment_len != 0x0ffffffe) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3495, "pinfo->desegment_len != 0x0ffffffe" , "Subdissector MUST NOT " "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to " " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined." ))))
3494 | "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to "((void) ((pinfo->desegment_len != 0x0ffffffe) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3495, "pinfo->desegment_len != 0x0ffffffe" , "Subdissector MUST NOT " "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to " " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined." ))))
3495 | " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined.")((void) ((pinfo->desegment_len != 0x0ffffffe) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\" (%s)" , "epan/reassemble.c", 3495, "pinfo->desegment_len != 0x0ffffffe" , "Subdissector MUST NOT " "set pinfo->desegment_len to DESEGMENT_UNTIL_FIN. Instead, it can set pinfo->desegment_len to " " DESEGMENT_ONE_MORE_SEGMENT or the length of head if the length of entire message is not able to be determined." ))));
3496 | /* only happen during first scan */
3497 | DISSECTOR_ASSERT(!PINFO_FD_VISITED(pinfo) && datalen == length)((void) ((!((pinfo)->fd->visited) && datalen == length) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 3497, "!((pinfo)->fd->visited) && datalen == length" ))));
3498 | offset += pinfo->desegment_offset;
3499 | length -= pinfo->desegment_offset;
3500 | } else {
3501 | /* all remaining bytes are consumed by subdissector */
3502 | offset += datalen;
3503 | length -= datalen;
3504 | }
3505 | if (!PINFO_FD_VISITED(pinfo)((pinfo)->fd->visited)) {
3506 | reassembly_info->prev_deseg_len = pinfo->desegment_len;
3507 | }
3508 | } /* else all remaining bytes (BoMSP) belong to a new MSP */
3509 | DISSECTOR_ASSERT(length >= 0)((void) ((length >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/reassemble.c", 3509, "length >= 0"))));
3510 | }
3511 |
3512 | /* handling BoMSP */
3513 | if (length > 0) {
3514 | col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "[%s segment of a reassembled PDU] ", label);
3515 | if (!PINFO_FD_VISITED(pinfo)((pinfo)->fd->visited)) {
3516 | /* create a msp for current frame during first scan */
3517 | cur_msp = wmem_new0(wmem_file_scope(), multisegment_pdu_t)((multisegment_pdu_t*)wmem_alloc0((wmem_file_scope()), sizeof (multisegment_pdu_t)));
3518 | cur_msp->first_frame = cur_frame_num;
3519 | cur_msp->last_frame = UINT64_MAX(18446744073709551615UL);
3520 | cur_msp->start_offset_at_first_frame = offset;
3521 | cur_msp->length = length;
3522 | cur_msp->streaming_reassembly_id = reassembly_id = create_streaming_reassembly_id();
3523 | cur_msp->prev_msp = reassembly_info->last_msp;
3524 | reassembly_info->last_msp = cur_msp;
3525 | if (reassembly_info->multisegment_pdus == NULL((void*)0)) {
3526 | reassembly_info->multisegment_pdus = wmem_map_new(wmem_file_scope(), g_int64_hash, g_int64_equal);
3527 | }
3528 | frame_ptr = (uint64_t*)wmem_memdup(wmem_file_scope(), &cur_frame_num, sizeof(uint64_t));
3529 | wmem_map_insert(reassembly_info->multisegment_pdus, frame_ptr, cur_msp);
3530 | } else {
3531 | DISSECTOR_ASSERT(cur_msp && cur_msp->start_offset_at_first_frame == offset)((void) ((cur_msp && cur_msp->start_offset_at_first_frame == offset) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/reassemble.c", 3531, "cur_msp && cur_msp->start_offset_at_first_frame == offset" ))));
3532 | reassembly_id = cur_msp->streaming_reassembly_id;
3533 | }
3534 | /* add first fragment of the new MSP to reassembly table */
3535 | head = fragment_add(&streaming_reassembly_table, tvb, offset, pinfo, reassembly_id,
3536 | NULL((void*)0), 0, length, true1);
3537 |
3538 | if (head && frag_hf_items->hf_reassembled_in) {
3539 | proto_item_set_generated(
3540 | proto_tree_add_uint(segment_tree, *(frag_hf_items->hf_reassembled_in),
3541 | tvb, offset, length, head->reassembled_in)
3542 | );
3543 | }
3544 | proto_tree_add_bytes_format(segment_tree, hf_segment_data, tvb, offset, length,
3545 | NULL((void*)0), "%s Segment data (%u byte%s)", label, length, plurality(length, "", "s")((length) == 1 ? ("") : ("s")));
3546 | }
3547 |
3548 | pinfo->can_desegment = save_can_desegment;
3549 | pinfo->desegment_offset = save_desegment_offset;
3550 | pinfo->desegment_len = save_desegment_len;
3551 |
3552 | return orig_length;
3553 | }
3554 |
3555 | int
3556 | additional_bytes_expected_to_complete_reassembly(streaming_reassembly_info_t* reassembly_info)
3557 | {
3558 | return reassembly_info->prev_deseg_len;
3559 | }
3560 |
3561 | /*
3562 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
3563 | *
3564 | * Local variables:
3565 | * c-basic-offset: 8
3566 | * tab-width: 8
3567 | * indent-tabs-mode: t
3568 | * End:
3569 | *
3570 | * vi: set shiftwidth=8 tabstop=8 noexpandtab:
3571 | * :indentSize=8:tabSize=8:noTabs=false:
3572 | */