### Bug Summary

File: | epan/tvbuff.c
Warning: | line 582, column 10 Potential leak of memory pointed to by 'buf'

### 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 tvbuff.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/2025-12-20-100337-3573-1 -x c /builds/wireshark/wireshark/epan/tvbuff.c

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1 | /* tvbuff.c
2 | *
3 | * Testy, Virtual(-izable) Buffer of uint8_t*'s
4 | *
5 | * "Testy" -- the buffer gets mad when an attempt to access data
6 | * beyond the bounds of the buffer. An exception is thrown.
7 | *
8 | * "Virtual" -- the buffer can have its own data, can use a subset of
9 | * the data of a backing tvbuff, or can be a composite of
10 | * other tvbuffs.
11 | *
12 | * Copyright (c) 2000 by Gilbert Ramirez <gram@alumni.rice.edu>
13 | *
14 | * Code to convert IEEE floating point formats to native floating point
15 | * derived from code Copyright (c) Ashok Narayanan, 2000
16 | *
17 | * Wireshark - Network traffic analyzer
18 | * By Gerald Combs <gerald@wireshark.org>
19 | * Copyright 1998 Gerald Combs
20 | *
21 | * SPDX-License-Identifier: GPL-2.0-or-later
22 | */
23 |
24 | #include "config.h"
25 |
26 | #include <string.h>
27 | #include <stdio.h>
28 | #include <errno(*__errno_location ()).h>
29 |
30 | #include <glib.h>
31 |
32 | #include "wsutil/pint.h"
33 | #include "wsutil/sign_ext.h"
34 | #include "wsutil/strtoi.h"
35 | #include "wsutil/unicode-utils.h"
36 | #include "wsutil/nstime.h"
37 | #include "wsutil/time_util.h"
38 | #include <wsutil/ws_assert.h>
39 | #include "tvbuff.h"
40 | #include "tvbuff-int.h"
41 | #include "strutil.h"
42 | #include "to_str.h"
43 | #include "charsets.h"
44 | #include "proto.h" /* XXX - only used for DISSECTOR_ASSERT, probably a new header file? */
45 | #include "exceptions.h"
46 |
47 | #include <time.h>
48 |
49 | static uint64_t
50 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits);
51 |
52 | static uint64_t
53 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits);
54 |
55 | static inline unsigned
56 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset);
57 |
58 | static inline const uint8_t*
59 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length);
60 |
61 | static inline const uint8_t*
62 | ensure_contiguous_unsigned(tvbuff_t *tvb, const unsigned offset, const unsigned length);
63 |
64 | static inline uint8_t *
65 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length);
66 |
67 | tvbuff_t *
68 | tvb_new(const struct tvb_ops *ops)
69 | {
70 | tvbuff_t *tvb;
71 | size_t size = ops->tvb_size;
72 |
73 | ws_assert(size >= sizeof(*tvb))do { if ((1) && !(size >= sizeof(*tvb))) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 73, __func__, "assertion failed: %s" , "size >= sizeof(*tvb)"); } while (0);
74 |
75 | tvb = (tvbuff_t *) g_slice_alloc(size);
76 |
77 | tvb->next = NULL((void*)0);
78 | tvb->ops = ops;
79 | tvb->initialized = false0;
80 | tvb->flags = 0;
81 | tvb->length = 0;
82 | tvb->reported_length = 0;
83 | tvb->contained_length = 0;
84 | tvb->real_data = NULL((void*)0);
85 | tvb->raw_offset = -1;
86 | tvb->ds_tvb = NULL((void*)0);
87 |
88 | return tvb;
89 | }
90 |
91 | static void
92 | tvb_free_internal(tvbuff_t *tvb)
93 | {
94 | size_t size;
95 |
96 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 96, "tvb"))));
97 |
98 | if (tvb->ops->tvb_free)
99 | tvb->ops->tvb_free(tvb);
100 |
101 | size = tvb->ops->tvb_size;
102 |
103 | g_slice_free1(size, tvb);
104 | }
105 |
106 | /* XXX: just call tvb_free_chain();
107 | * Not removed so that existing dissectors using tvb_free() need not be changed.
108 | * I'd argue that existing calls to tvb_free() should have actually been
109 | * calls to tvb_free_chain() although the calls were OK as long as no
110 | * subsets, etc had been created on the tvb. */
111 | void
112 | tvb_free(tvbuff_t *tvb)
113 | {
114 | tvb_free_chain(tvb);
115 | }
116 |
117 | void
118 | tvb_free_chain(tvbuff_t *tvb)
119 | {
120 | tvbuff_t *next_tvb;
121 | DISSECTOR_ASSERT(tvb)((void) ((tvb) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 121, "tvb"))));
122 | while (tvb) {
123 | next_tvb = tvb->next;
124 | tvb_free_internal(tvb);
125 | tvb = next_tvb;
126 | }
127 | }
128 |
129 | tvbuff_t *
130 | tvb_new_chain(tvbuff_t *parent, tvbuff_t *backing)
131 | {
132 | tvbuff_t *tvb = tvb_new_proxy(backing);
133 |
134 | tvb_add_to_chain(parent, tvb);
135 | return tvb;
136 | }
137 |
138 | void
139 | tvb_add_to_chain(tvbuff_t *parent, tvbuff_t *child)
140 | {
141 | tvbuff_t *tmp;
142 |
143 | DISSECTOR_ASSERT(parent)((void) ((parent) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 143, "parent"))));
144 | DISSECTOR_ASSERT(child)((void) ((child) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 144, "child"))));
145 |
146 | while (child) {
147 | tmp = child;
148 | child = child->next;
149 |
150 | tmp->next = parent->next;
151 | parent->next = tmp;
152 | }
153 | }
154 |
155 | /*
156 | * Check whether that offset goes more than one byte past the
157 | * end of the buffer.
158 | *
159 | * If not, return 0; otherwise, return exception
160 | */
161 | static inline int
162 | validate_offset(const tvbuff_t *tvb, const unsigned abs_offset)
163 | {
164 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
165 | /* It's OK. */
166 | return 0;
167 | }
168 |
169 | /*
170 | * It's not OK, but why? Which boundaries is it
171 | * past?
172 | */
173 | if (abs_offset <= tvb->contained_length) {
174 | /*
175 | * It's past the captured length, but not past
176 | * the reported end of any parent tvbuffs from
177 | * which this is constructed, or the reported
178 | * end of this tvbuff, so it's out of bounds
179 | * solely because we're past the end of the
180 | * captured data.
181 | */
182 | return BoundsError1;
183 | }
184 |
185 | /*
186 | * There's some actual packet boundary, not just the
187 | * artificial boundary imposed by packet slicing, that
188 | * we're past.
189 | */
190 |
191 | if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
192 | /*
193 | * This tvbuff is the first fragment of a larger
194 | * packet that hasn't been reassembled, so we
195 | * assume that's the source of the problem - if
196 | * we'd reassembled the packet, we wouldn't have
197 | * gone past the end.
198 | *
199 | * That might not be true, but for at least
200 | * some forms of reassembly, such as IP
201 | * reassembly, you don't know how big the
202 | * reassembled packet is unless you reassemble
203 | * it, so, in those cases, we can't determine
204 | * whether we would have gone past the end
205 | * had we reassembled the packet.
206 | */
207 | return FragmentBoundsError4;
208 | }
209 |
210 | /* OK, we're not an unreassembled fragment (that we know of). */
211 | if (abs_offset <= tvb->reported_length) {
212 | /*
213 | * We're within the bounds of what this tvbuff
214 | * purportedly contains, based on some length
215 | * value, but we're not within the bounds of
216 | * something from which this tvbuff was
217 | * extracted, so that length value ran past
218 | * the end of some parent tvbuff.
219 | */
220 | return ContainedBoundsError2;
221 | }
222 |
223 | /*
224 | * OK, it looks as if we ran past the claimed length
225 | * of data.
226 | */
227 | return ReportedBoundsError3;
228 | }
229 |
230 | static inline int
231 | validate_offset_and_remaining(const tvbuff_t *tvb, const unsigned offset, unsigned *rem_len)
232 | {
233 | int exception;
234 |
235 | exception = validate_offset(tvb, offset);
236 | if (!exception)
237 | *rem_len = tvb->length - offset;
238 |
239 | return exception;
240 | }
241 |
242 | /* Returns integer indicating whether the given offset and the end offset
243 | * calculated from that offset and the given length are in bounds (0) or
244 | * not (exception number).
245 | * No exception is thrown; on success, we return 0, otherwise we return an
246 | * exception for the caller to throw if appropriate.
247 | *
248 | * N.B. - we return success (0), if the offset is positive and right
249 | * after the end of the tvbuff (i.e., equal to the length). We do this
250 | * so that a dissector constructing a subset tvbuff for the next protocol
251 | * will get a zero-length tvbuff, not an exception, if there's no data
252 | * left for the next protocol - we want the next protocol to be the one
253 | * that gets an exception, so the error is reported as an error in that
254 | * protocol rather than the containing protocol. */
255 | static inline int
256 | validate_offset_length_no_exception(const tvbuff_t *tvb,
257 | const unsigned offset, const unsigned length)
258 | {
259 | unsigned end_offset;
260 | int exception;
261 |
262 | /* Compute the offset */
263 | exception = validate_offset(tvb, offset);
264 | if (exception)
265 | return exception;
266 |
267 | /*
268 | * Compute the offset of the first byte past the length,
269 | * checking for an overflow.
270 | */
271 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
272 | return BoundsError1;
273 |
274 | return validate_offset(tvb, end_offset);
275 | }
276 |
277 | /* Checks offset and length and throws an exception if
278 | * either is out of bounds. Sets integer ptrs to the new length. */
279 | static inline void
280 | validate_offset_length(const tvbuff_t *tvb,
281 | const unsigned offset, const unsigned length)
282 | {
283 | int exception;
284 |
285 | exception = validate_offset_length_no_exception(tvb, offset, length);
286 | if (exception)
287 | THROW(exception)except_throw(1, (exception), ((void*)0));
288 | }
289 |
290 | /* Internal function so that other translation units can use
291 | * validate_offset_length. */
292 | void
293 | tvb_validate_offset_length(const tvbuff_t *tvb,
294 | const unsigned offset, const unsigned length)
295 | {
296 | validate_offset_length(tvb, offset, length);
297 | }
298 |
299 | /* Internal function so that other translation units can use
300 | * validate_offset_and_remaining. This throws the exception
301 | * from validate_offset_and_remaining. */
302 | void
303 | tvb_validate_offset_and_remaining(const tvbuff_t *tvb,
304 | const unsigned offset, unsigned *rem_len)
305 | {
306 | int exception;
307 |
308 | exception = validate_offset_and_remaining(tvb, offset, rem_len);
309 | if (exception)
310 | THROW(exception)except_throw(1, (exception), ((void*)0));
311 | }
312 |
313 | /*
314 | * The same as validate_offset except this accepts negative offsets, meaning
315 | * relative to the end of (captured) length. (That it's captured, not reported,
316 | * length is one reason to deprecate signed offsets, #20103.)
317 | */
318 | static inline int
319 | compute_offset(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr)
320 | {
321 | if (offset >= 0) {
322 | /* Positive offset - relative to the beginning of the packet. */
323 | if (G_LIKELY((unsigned) offset <= tvb->length)((unsigned) offset <= tvb->length)) {
324 | *offset_ptr = offset;
325 | } else if ((unsigned) offset <= tvb->contained_length) {
326 | return BoundsError1;
327 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
328 | return FragmentBoundsError4;
329 | } else if ((unsigned) offset <= tvb->reported_length) {
330 | return ContainedBoundsError2;
331 | } else {
332 | return ReportedBoundsError3;
333 | }
334 | }
335 | else {
336 | /* Negative offset - relative to the end of the packet. */
337 | /* Prevent UB on 2's complement platforms. All tested compilers
338 | * (gcc, clang, MSVC) compile this to a single instruction on
339 | * x86, ARM, RISC-V, S390x, SPARC, etc. at -O1 and higher
340 | * according to godbolt.org. */
341 | unsigned abs_offset = ((unsigned)-(offset + 1)) + 1;
342 | if (G_LIKELY(abs_offset <= tvb->length)(abs_offset <= tvb->length)) {
343 | *offset_ptr = tvb->length - abs_offset;
344 | } else if (abs_offset <= tvb->contained_length) {
345 | return BoundsError1;
346 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
347 | return FragmentBoundsError4;
348 | } else if (abs_offset <= tvb->reported_length) {
349 | return ContainedBoundsError2;
350 | } else {
351 | return ReportedBoundsError3;
352 | }
353 | }
354 |
355 | return 0;
356 | }
357 |
358 | static inline int
359 | compute_offset_and_remaining(const tvbuff_t *tvb, const int offset, unsigned *offset_ptr, unsigned *rem_len)
360 | {
361 | int exception;
362 |
363 | exception = compute_offset(tvb, offset, offset_ptr);
364 | if (!exception)
365 | *rem_len = tvb->length - *offset_ptr;
366 |
367 | return exception;
368 | }
369 |
370 | /* Computes the absolute offset and length based on a possibly-negative offset
371 | * and a length that is possible -1 (which means "to the end of the data").
372 | * Returns integer indicating whether the offset is in bounds (0) or
373 | * not (exception number). The integer ptrs are modified with the new offset,
374 | * captured (available) length, and contained length (amount that's present
375 | * in the parent tvbuff based on its reported length).
376 | * No exception is thrown; on success, we return 0, otherwise we return an
377 | * exception for the caller to throw if appropriate.
378 | *
379 | * XXX - we return success (0), if the offset is positive and right
380 | * after the end of the tvbuff (i.e., equal to the length). We do this
381 | * so that a dissector constructing a subset tvbuff for the next protocol
382 | * will get a zero-length tvbuff, not an exception, if there's no data
383 | * left for the next protocol - we want the next protocol to be the one
384 | * that gets an exception, so the error is reported as an error in that
385 | * protocol rather than the containing protocol. */
386 | static inline int
387 | check_offset_length_no_exception(const tvbuff_t *tvb,
388 | const int offset, int const length_val,
389 | unsigned *offset_ptr, unsigned *length_ptr)
390 | {
391 | unsigned end_offset;
392 | int exception;
393 |
394 | DISSECTOR_ASSERT(offset_ptr)((void) ((offset_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 394, "offset_ptr" ))));
395 | DISSECTOR_ASSERT(length_ptr)((void) ((length_ptr) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 395, "length_ptr" ))));
396 |
397 | /* Compute the offset */
398 | exception = compute_offset(tvb, offset, offset_ptr);
399 | if (exception)
400 | return exception;
401 |
402 | if (length_val < -1) {
403 | /* XXX - ReportedBoundsError? */
404 | return BoundsError1;
405 | }
406 |
407 | /* Compute the length */
408 | if (length_val == -1)
409 | *length_ptr = tvb->length - *offset_ptr;
410 | else
411 | *length_ptr = length_val;
412 |
413 | /*
414 | * Compute the offset of the first byte past the length.
415 | */
416 | end_offset = *offset_ptr + *length_ptr;
417 |
418 | /*
419 | * Check for an overflow
420 | */
421 | if (end_offset < *offset_ptr)
422 | return BoundsError1;
423 |
424 | return validate_offset(tvb, end_offset);
425 | }
426 |
427 | /* Checks (+/-) offset and length and throws an exception if
428 | * either is out of bounds. Sets integer ptrs to the new offset
429 | * and length. */
430 | static inline void
431 | check_offset_length(const tvbuff_t *tvb,
432 | const int offset, int const length_val,
433 | unsigned *offset_ptr, unsigned *length_ptr)
434 | {
435 | int exception;
436 |
437 | exception = check_offset_length_no_exception(tvb, offset, length_val, offset_ptr, length_ptr);
438 | if (exception)
439 | THROW(exception)except_throw(1, (exception), ((void*)0));
440 | }
441 |
442 | /* Internal function so that other translation units can use
443 | * check_offset_length. */
444 | void
445 | tvb_check_offset_length(const tvbuff_t *tvb,
446 | const int offset, int const length_val,
447 | unsigned *offset_ptr, unsigned *length_ptr)
448 | {
449 | check_offset_length(tvb, offset, length_val, offset_ptr, length_ptr);
450 | }
451 |
452 | static const unsigned char left_aligned_bitmask[] = {
453 | 0xff,
454 | 0x80,
455 | 0xc0,
456 | 0xe0,
457 | 0xf0,
458 | 0xf8,
459 | 0xfc,
460 | 0xfe
461 | };
462 |
463 | /* tvb_new_octet_aligned used to support -1 no_of_bits as meaning "to the
464 | * end of the buffer." Nothing every used it. It could be supported with
465 | * a _remaining() function if necessary. Note that the previous implementation
466 | * didn't properly keep the extra reported length if the reported length
467 | * was greater than the captured length.
468 | */
469 |
470 | tvbuff_t *
471 | tvb_new_octet_aligned(tvbuff_t *tvb, uint32_t bit_offset, uint32_t no_of_bits)
472 | {
473 | tvbuff_t *sub_tvb = NULL((void*)0);
474 | uint32_t byte_offset;
475 | uint32_t datalen, i;
476 | uint8_t left, right, remaining_bits, *buf;
477 | const uint8_t *data;
478 |
479 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 479, "tvb && tvb->initialized" ))));
480 |
481 | byte_offset = bit_offset >> 3;
482 | left = bit_offset % 8; /* for left-shifting */
483 | right = 8 - left; /* for right-shifting */
484 |
485 | datalen = no_of_bits >> 3;
486 | remaining_bits = no_of_bits % 8;
487 | if (remaining_bits) {
488 | datalen++;
489 | }
490 |
491 | /* already aligned -> shortcut */
492 | if (((left == 0) && (remaining_bits == 0)) || datalen == 0) {
493 | return tvb_new_subset_length_caplen(tvb, byte_offset, datalen, datalen);
494 | }
495 |
496 | /* If at least one trailing byte is available, we must use the content
497 | * of that byte for the last shift (i.e. tvb_get_ptr() must use datalen + 1).
498 | * If no extra byte is available, the last shifted byte requires
499 | * special treatment.
500 | */
501 | if (_tvb_captured_length_remaining(tvb, byte_offset) > datalen) {
502 | data = ensure_contiguous(tvb, byte_offset, datalen + 1); /* tvb_get_ptr */
503 |
504 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
505 | buf = (uint8_t *)g_malloc(datalen);
506 |
507 | /* shift tvb data bit_offset bits to the left */
508 | for (i = 0; i < datalen; i++)
509 | buf[i] = (data[i] << left) | (data[i+1] >> right);
510 | } else {
511 | data = ensure_contiguous(tvb, byte_offset, datalen); /* tvb_get_ptr() */
512 |
513 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
514 | buf = (uint8_t *)g_malloc(datalen);
515 |
516 | /* shift tvb data bit_offset bits to the left */
517 | for (i = 0; i < (datalen-1); i++)
518 | buf[i] = (data[i] << left) | (data[i+1] >> right);
519 | buf[datalen-1] = data[datalen-1] << left; /* set last octet */
520 | }
521 | buf[datalen-1] &= left_aligned_bitmask[remaining_bits];
522 |
523 | sub_tvb = tvb_new_child_real_data(tvb, buf, datalen, datalen);
524 | tvb_set_free_cb(sub_tvb, g_free);
525 |
526 | return sub_tvb;
527 | }
528 |
529 | tvbuff_t *
530 | tvb_new_octet_right_aligned(tvbuff_t *tvb, uint32_t bit_offset, uint32_t no_of_bits)
531 | {
532 | tvbuff_t *sub_tvb = NULL((void*)0);
533 | uint32_t byte_offset;
534 | unsigned src_len, dst_len, i;
535 | uint8_t left, right, remaining_bits, *buf;
536 | const uint8_t *data;
537 |
538 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 538, "tvb && tvb->initialized" ))));
4 | ← | Assuming 'tvb' is non-null | →
5 | ← | Assuming field 'initialized' is true | →
6 | ← | '?' condition is true | →
539 |
540 | byte_offset = bit_offset / 8;
541 | /* right shift to put bits in place and discard least significant bits */
542 | right = bit_offset % 8;
543 | /* left shift to get most significant bits from next octet */
544 | left = 8 - right;
545 |
546 | dst_len = no_of_bits / 8;
547 | remaining_bits = no_of_bits % 8;
548 | if (remaining_bits) {
7 | ← | Assuming 'remaining_bits' is 0 | →
549 | dst_len++;
550 | }
551 |
552 | /* already aligned -> shortcut */
553 | if (((right == 0) && (remaining_bits == 0)) || dst_len == 0) {
8 | ← | Assuming 'right' is not equal to 0 | →
9 | ← | Assuming 'dst_len' is not equal to 0 | →
10 | ← | Taking false branch | →
554 | return tvb_new_subset_length_caplen(tvb, byte_offset, dst_len, dst_len);
555 | }
556 |
557 | if (_tvb_captured_length_remaining(tvb, byte_offset) > dst_len) {
11 | ← | Taking false branch | →
558 | /* last octet will get data from trailing octet */
559 | src_len = dst_len + 1;
560 | } else {
561 | /* last octet will be zero padded */
562 | src_len = dst_len;
563 | }
564 |
565 | data = ensure_contiguous(tvb, byte_offset, src_len); /* tvb_get_ptr */
566 |
567 | /* Do this allocation AFTER tvb_get_ptr() (which could throw an exception) */
568 | buf = (uint8_t *)g_malloc(dst_len);
12 | ← | Memory is allocated | →
569 |
570 | for (i = 0; i < (dst_len - 1); i++)
13 | ← | Assuming the condition is false | →
14 | ← | Loop condition is false. Execution continues on line 574 | →
571 | buf[i] = (data[i] >> right) | (data[i+1] << left);
572 |
573 | /* Special handling for last octet */
574 | buf[i] = (data[i] >> right);
15 | ← | Assuming right operand of bit shift is less than 32 | →
575 | /* Shift most significant bits from trailing octet if available */
576 | if (src_len
15.1 | 'src_len' is <= 'dst_len'
> dst_len)
16 | ← | Taking false branch | →
577 | buf[i] |= (data[i+1] << left);
578 | /* Preserve only remaining bits in last octet if not multiple of 8 */
579 | if (remaining_bits
16.1 | 'remaining_bits' is 0
)
17 | ← | Taking false branch | →
580 | buf[i] &= ((1 << remaining_bits) - 1);
581 |
582 | sub_tvb = tvb_new_child_real_data(tvb, buf, dst_len, dst_len);
18 | ← | Potential leak of memory pointed to by 'buf'
583 | tvb_set_free_cb(sub_tvb, g_free);
584 |
585 | return sub_tvb;
586 | }
587 |
588 | static tvbuff_t *
589 | tvb_generic_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
590 | {
591 | tvbuff_t *cloned_tvb;
592 | uint8_t *data;
593 |
594 | DISSECTOR_ASSERT(tvb_bytes_exist(tvb, offset, len))((void) ((tvb_bytes_exist(tvb, offset, len)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 594, "tvb_bytes_exist(tvb, offset, len)" ))));
595 |
596 | data = (uint8_t *) g_malloc(len);
597 |
598 | tvb_memcpy(tvb, data, offset, len);
599 |
600 | cloned_tvb = tvb_new_real_data(data, len, len);
601 | tvb_set_free_cb(cloned_tvb, g_free);
602 |
603 | return cloned_tvb;
604 | }
605 |
606 | tvbuff_t *
607 | tvb_clone_offset_len(tvbuff_t *tvb, unsigned offset, unsigned len)
608 | {
609 | if (tvb->ops->tvb_clone) {
610 | tvbuff_t *cloned_tvb;
611 |
612 | cloned_tvb = tvb->ops->tvb_clone(tvb, offset, len);
613 | if (cloned_tvb)
614 | return cloned_tvb;
615 | }
616 |
617 | return tvb_generic_clone_offset_len(tvb, offset, len);
618 | }
619 |
620 | tvbuff_t *
621 | tvb_clone(tvbuff_t *tvb)
622 | {
623 | return tvb_clone_offset_len(tvb, 0, tvb->length);
624 | }
625 |
626 | unsigned
627 | tvb_captured_length(const tvbuff_t *tvb)
628 | {
629 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 629, "tvb && tvb->initialized" ))));
630 |
631 | return tvb->length;
632 | }
633 |
634 | /* For tvbuff internal use */
635 | static inline unsigned
636 | _tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
637 | {
638 | unsigned rem_length;
639 | int exception;
640 |
641 | exception = validate_offset_and_remaining(tvb, offset, &rem_length);
642 | if (exception)
643 | return 0;
644 |
645 | return rem_length;
646 | }
647 |
648 | int
649 | tvb_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
650 | {
651 | unsigned rem_length;
652 | int exception;
653 |
654 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 654, "tvb && tvb->initialized" ))));
655 |
656 | exception = validate_offset_and_remaining(tvb, offset, &rem_length);
657 | if (exception)
658 | return 0;
659 |
660 | return rem_length;
661 | }
662 |
663 | unsigned
664 | tvb_ensure_captured_length_remaining(const tvbuff_t *tvb, const unsigned offset)
665 | {
666 | unsigned rem_length = 0;
667 | int exception;
668 |
669 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 669, "tvb && tvb->initialized" ))));
670 |
671 | exception = validate_offset(tvb, offset);
672 | if (exception)
673 | THROW(exception)except_throw(1, (exception), ((void*)0));
674 |
675 | rem_length = tvb->length - offset;
676 |
677 | if (rem_length == 0) {
678 | /*
679 | * This routine ensures there's at least one byte available.
680 | * There aren't any bytes available, so throw the appropriate
681 | * exception.
682 | */
683 | if (offset < tvb->contained_length) {
684 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
685 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
686 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
687 | } else if (offset < tvb->reported_length) {
688 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
689 | } else {
690 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
691 | }
692 | }
693 | return rem_length;
694 | }
695 |
696 | /* Validates that 'length' bytes are available starting from
697 | * offset. Does not throw an exception. */
698 | bool_Bool
699 | tvb_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
700 | {
701 | unsigned end_offset;
702 |
703 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 703, "tvb && tvb->initialized" ))));
704 |
705 | /*
706 | * Negative lengths are not possible and indicate a bug (e.g. arithmetic
707 | * error or an overly large value from packet data).
708 | */
709 | if (length < 0)
710 | return false0;
711 |
712 | /*
713 | * Compute the offset of the first byte past the length.
714 | * Make sure it doesn't overflow.
715 | */
716 | if (ckd_add(&end_offset, offset, length)__builtin_add_overflow((offset), (length), (&end_offset)))
717 | return false0;
718 |
719 | /*
720 | * Check that bytes exist up to right before that offset. (As length is
721 | * positive and there was no overflow we don't need to check offset.)
722 | */
723 | if (end_offset > tvb->length)
724 | return false0;
725 |
726 | return true1;
727 | }
728 |
729 | /* Validates that 'length' bytes, where 'length' is a 64-bit unsigned
730 | * integer, are available starting from offset (pos/neg). Throws an
731 | * exception if they aren't. */
732 | void
733 | tvb_ensure_bytes_exist64(const tvbuff_t *tvb, const unsigned offset, const uint64_t length)
734 | {
735 | /*
736 | * Make sure the value fits in a signed integer; if not, assume
737 | * that means that it's too big.
738 | */
739 | if (length > INT_MAX2147483647) {
740 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
741 | }
742 |
743 | /* OK, now cast it and try it with tvb_ensure_bytes_exist(). */
744 | tvb_ensure_bytes_exist(tvb, offset, (int)length);
745 | }
746 |
747 | /* Validates that 'length' bytes are available starting from
748 | * offset (pos/neg). Throws an exception if they aren't. */
749 | void
750 | tvb_ensure_bytes_exist(const tvbuff_t *tvb, const unsigned offset, const int length)
751 | {
752 | unsigned end_offset;
753 | int exception;
754 |
755 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 755, "tvb && tvb->initialized" ))));
756 |
757 | /*
758 | * -1 doesn't mean "until end of buffer", as that's pointless
759 | * for this routine. We must treat it as a Really Large Positive
760 | * Number, so that we throw an exception; we throw
761 | * ReportedBoundsError, as if it were past even the end of a
762 | * reassembled packet, and past the end of even the data we
763 | * didn't capture.
764 | *
765 | * We do the same with other negative lengths.
766 | */
767 | if (length < 0) {
768 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
769 | }
770 |
771 | exception = validate_offset(tvb, offset);
772 | if (exception)
773 | THROW(exception)except_throw(1, (exception), ((void*)0));
774 |
775 | /*
776 | * Compute the offset of the first byte past the length.
777 | */
778 | end_offset = offset + length;
779 |
780 | /*
781 | * Check for an overflow
782 | */
783 | if (end_offset < offset)
784 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
785 |
786 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length))
787 | return;
788 | else if (end_offset <= tvb->contained_length)
789 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
790 | else if (tvb->flags & TVBUFF_FRAGMENT0x00000001)
791 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
792 | else if (end_offset <= tvb->reported_length)
793 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
794 | else
795 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
796 | }
797 |
798 | bool_Bool
799 | tvb_offset_exists(const tvbuff_t *tvb, const unsigned offset)
800 | {
801 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 801, "tvb && tvb->initialized" ))));
802 |
803 | /* We don't care why the offset doesn't exist, and unlike some
804 | * other functions we don't accept an offset one past the end,
805 | * so we check ourselves... */
806 | return offset < tvb->length;
807 | }
808 |
809 | unsigned
810 | tvb_reported_length(const tvbuff_t *tvb)
811 | {
812 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 812, "tvb && tvb->initialized" ))));
813 |
814 | return tvb->reported_length;
815 | }
816 |
817 | int
818 | tvb_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
819 | {
820 | int exception;
821 |
822 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 822, "tvb && tvb->initialized" ))));
823 |
824 | exception = validate_offset(tvb, offset);
825 | if (exception)
826 | return 0;
827 |
828 | if (tvb->reported_length >= offset)
829 | return tvb->reported_length - offset;
830 | else
831 | return 0;
832 | }
833 |
834 | unsigned
835 | tvb_ensure_reported_length_remaining(const tvbuff_t *tvb, const unsigned offset)
836 | {
837 | int exception;
838 |
839 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 839, "tvb && tvb->initialized" ))));
840 |
841 | exception = validate_offset(tvb, offset);
842 | if (exception)
843 | THROW(exception)except_throw(1, (exception), ((void*)0));
844 |
845 | if (tvb->reported_length >= offset)
846 | return tvb->reported_length - offset;
847 | else
848 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
849 | }
850 |
851 | /* Set the reported length of a tvbuff to a given value; used for protocols
852 | * whose headers contain an explicit length and where the calling
853 | * dissector's payload may include padding as well as the packet for
854 | * this protocol.
855 | * Also adjusts the available and contained length. */
856 | void
857 | tvb_set_reported_length(tvbuff_t *tvb, const unsigned reported_length)
858 | {
859 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 859, "tvb && tvb->initialized" ))));
860 |
861 | if (reported_length > tvb->reported_length)
862 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
863 |
864 | tvb->reported_length = reported_length;
865 | if (reported_length < tvb->length)
866 | tvb->length = reported_length;
867 | if (reported_length < tvb->contained_length)
868 | tvb->contained_length = reported_length;
869 | }
870 |
871 | /* Repair a tvbuff where the captured length is greater than the
872 | * reported length; such a tvbuff makes no sense, as it's impossible
873 | * to capture more data than is in the packet.
874 | */
875 | void
876 | tvb_fix_reported_length(tvbuff_t *tvb)
877 | {
878 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 878, "tvb && tvb->initialized" ))));
879 | DISSECTOR_ASSERT(tvb->reported_length < tvb->length)((void) ((tvb->reported_length < tvb->length) ? (void )0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 879, "tvb->reported_length < tvb->length" ))));
880 |
881 | tvb->reported_length = tvb->length;
882 | if (tvb->contained_length < tvb->length)
883 | tvb->contained_length = tvb->length;
884 | }
885 |
886 | unsigned
887 | tvb_offset_from_real_beginning_counter(const tvbuff_t *tvb, const unsigned counter)
888 | {
889 | if (tvb->ops->tvb_offset)
890 | return tvb->ops->tvb_offset(tvb, counter);
891 |
892 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 892));
893 | return 0;
894 | }
895 |
896 | unsigned
897 | tvb_offset_from_real_beginning(const tvbuff_t *tvb)
898 | {
899 | return tvb_offset_from_real_beginning_counter(tvb, 0);
900 | }
901 |
902 | static inline const uint8_t*
903 | ensure_contiguous_unsigned_no_exception(tvbuff_t *tvb, const unsigned offset, const unsigned length, int *pexception)
904 | {
905 | int exception;
906 |
907 | exception = validate_offset_length_no_exception(tvb, offset, length);
908 | if (exception) {
909 | if (pexception)
910 | *pexception = exception;
911 | return NULL((void*)0);
912 | }
913 |
914 | /*
915 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
916 | * then it is acceptable to have an empty tvb (!tvb->real_data).
917 | */
918 | if (length == 0) {
919 | return NULL((void*)0);
920 | }
921 |
922 | /*
923 | * We know that all the data is present in the tvbuff, so
924 | * no exceptions should be thrown.
925 | */
926 | if (tvb->real_data)
927 | return tvb->real_data + offset;
928 |
929 | if (tvb->ops->tvb_get_ptr)
930 | return tvb->ops->tvb_get_ptr(tvb, offset, length);
931 |
932 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 932));
933 | return NULL((void*)0);
934 | }
935 |
936 | static inline const uint8_t*
937 | ensure_contiguous_unsigned(tvbuff_t *tvb, const unsigned offset, const unsigned length)
938 | {
939 | int exception = 0;
940 | const uint8_t *p;
941 |
942 | p = ensure_contiguous_unsigned_no_exception(tvb, offset, length, &exception);
943 | if (p == NULL((void*)0) && length != 0) {
944 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 944, "exception > 0" ))));
945 | THROW(exception)except_throw(1, (exception), ((void*)0));
946 | }
947 | return p;
948 | }
949 |
950 | static inline const uint8_t*
951 | ensure_contiguous_no_exception(tvbuff_t *tvb, const int offset, const int length, int *pexception)
952 | {
953 | unsigned abs_offset = 0, abs_length = 0;
954 | int exception;
955 |
956 | exception = check_offset_length_no_exception(tvb, offset, length, &abs_offset, &abs_length);
957 | if (exception) {
958 | if (pexception)
959 | *pexception = exception;
960 | return NULL((void*)0);
961 | }
962 |
963 | /*
964 | * Special case: if the caller (e.g. tvb_get_ptr) requested no data,
965 | * then it is acceptable to have an empty tvb (!tvb->real_data).
966 | */
967 | if (length == 0) {
968 | return NULL((void*)0);
969 | }
970 |
971 | /*
972 | * We know that all the data is present in the tvbuff, so
973 | * no exceptions should be thrown.
974 | */
975 | if (tvb->real_data)
976 | return tvb->real_data + abs_offset;
977 |
978 | if (tvb->ops->tvb_get_ptr)
979 | return tvb->ops->tvb_get_ptr(tvb, abs_offset, abs_length);
980 |
981 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 981));
982 | return NULL((void*)0);
983 | }
984 |
985 | static inline const uint8_t*
986 | ensure_contiguous(tvbuff_t *tvb, const int offset, const int length)
987 | {
988 | int exception = 0;
989 | const uint8_t *p;
990 |
991 | p = ensure_contiguous_no_exception(tvb, offset, length, &exception);
992 | if (p == NULL((void*)0) && length != 0) {
993 | DISSECTOR_ASSERT(exception > 0)((void) ((exception > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 993, "exception > 0" ))));
994 | THROW(exception)except_throw(1, (exception), ((void*)0));
995 | }
996 | return p;
997 | }
998 |
999 | static inline const uint8_t*
1000 | fast_ensure_contiguous(tvbuff_t *tvb, const int offset, const unsigned length)
1001 | {
1002 | unsigned end_offset;
1003 | unsigned u_offset;
1004 |
1005 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1005, "tvb && tvb->initialized" ))));
1006 | /* We don't check for overflow in this fast path so we only handle simple types */
1007 | DISSECTOR_ASSERT(length <= 8)((void) ((length <= 8) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1007, "length <= 8" ))));
1008 |
1009 | if (offset < 0 || !tvb->real_data) {
1010 | return ensure_contiguous(tvb, offset, length);
1011 | }
1012 |
1013 | u_offset = offset;
1014 | end_offset = u_offset + length;
1015 |
1016 | if (G_LIKELY(end_offset <= tvb->length)(end_offset <= tvb->length)) {
1017 | return tvb->real_data + u_offset;
1018 | } else if (end_offset <= tvb->contained_length) {
1019 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
1020 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
1021 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
1022 | } else if (end_offset <= tvb->reported_length) {
1023 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
1024 | } else {
1025 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
1026 | }
1027 | /* not reached */
1028 | return NULL((void*)0);
1029 | }
1030 |
1031 |
1032 |
1033 | /************** ACCESSORS **************/
1034 |
1035 | void *
1036 | tvb_memcpy(tvbuff_t *tvb, void *target, const unsigned offset, size_t length)
1037 | {
1038 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1038, "tvb && tvb->initialized" ))));
1039 |
1040 | /*
1041 | * XXX - The length is a size_t, but the tvb length and tvb_ops
1042 | * only supports an unsigned.
1043 | */
1044 | DISSECTOR_ASSERT(length <= UINT_MAX)((void) ((length <= (2147483647 *2U +1U)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1044, "length <= (2147483647 *2U +1U)" ))));
1045 | validate_offset_length(tvb, offset, (unsigned)length);
1046 |
1047 | if (target && tvb->real_data) {
1048 | return memcpy(target, tvb->real_data + offset, length);
1049 | }
1050 |
1051 | if (target && tvb->ops->tvb_memcpy)
1052 | return tvb->ops->tvb_memcpy(tvb, target, offset, (unsigned)length);
1053 |
1054 | /*
1055 | * If the length is 0, there's nothing to do.
1056 | * (tvb->real_data could be null if it's allocated with
1057 | * a size of length.)
1058 | */
1059 | if (length != 0) {
1060 | /*
1061 | * XXX, fallback to slower method
1062 | */
1063 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 1063));
1064 | }
1065 | return NULL((void*)0);
1066 | }
1067 |
1068 |
1069 | /*
1070 | * XXX - This could replace some code that calls "tvb_ensure_bytes_exist()"
1071 | * and then allocates a buffer and copies data to it.
1072 | *
1073 | * If scope is NULL, memory is allocated with g_malloc() and user must
1074 | * explicitly free it with g_free().
1075 | * If scope is not NULL, memory is allocated with the corresponding pool
1076 | * lifetime.
1077 | */
1078 | void *
1079 | tvb_memdup(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, size_t length)
1080 | {
1081 | void *duped;
1082 |
1083 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1083, "tvb && tvb->initialized" ))));
1084 |
1085 | /*
1086 | * XXX - The length is a size_t, but the tvb length and tvb_ops
1087 | * only supports an unsigned.
1088 | */
1089 | DISSECTOR_ASSERT(length <= UINT_MAX)((void) ((length <= (2147483647 *2U +1U)) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1089, "length <= (2147483647 *2U +1U)" ))));
1090 | validate_offset_length(tvb, offset, (unsigned)length);
1091 |
1092 | if (length == 0)
1093 | return NULL((void*)0);
1094 |
1095 | duped = wmem_alloc(scope, length);
1096 | return tvb_memcpy(tvb, duped, offset, length);
1097 | }
1098 |
1099 | #if 0
1100 | /* XXX - Is a _remaining variant of this necessary? The user would still need
1101 | * to get the length from tvb_captured_length_remaining() to productively use
1102 | * the (not necessarily null terminated) byte array. But see uses of
1103 | * tvb_get_ptr(...,...,-1) in the repo, which is similar. */
1104 | void *
1105 | tvb_memdup_remaining(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset)
1106 | {
1107 | void *duped;
1108 | unsigned length;
1109 |
1110 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 1110, "tvb && tvb->initialized" ))));
1111 |
1112 | validate_offset_and_remaining(tvb, offset, &length);
1113 |
1114 | if (length == 0)
1115 | return NULL((void*)0);
1116 |
1117 | duped = wmem_alloc(scope, length);
1118 | return tvb_memcpy(tvb, duped, offset, length);
1119 | }
1120 | #endif
1121 |
1122 | const uint8_t*
1123 | tvb_get_ptr(tvbuff_t *tvb, const int offset, const int length)
1124 | {
1125 | return ensure_contiguous(tvb, offset, length);
1126 | }
1127 |
1128 | /* ---------------- */
1129 | uint8_t
1130 | tvb_get_uint8(tvbuff_t *tvb, const int offset)
1131 | {
1132 | const uint8_t *ptr;
1133 |
1134 | ptr = fast_ensure_contiguous(tvb, offset, 1);
1135 | return *ptr;
1136 | }
1137 |
1138 | int8_t
1139 | tvb_get_int8(tvbuff_t *tvb, const int offset)
1140 | {
1141 | const uint8_t *ptr;
1142 |
1143 | ptr = fast_ensure_contiguous(tvb, offset, 1);
1144 | return *ptr;
1145 | }
1146 |
1147 | uint16_t
1148 | tvb_get_ntohs(tvbuff_t *tvb, const int offset)
1149 | {
1150 | const uint8_t *ptr;
1151 |
1152 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1153 | return pntohu16(ptr);
1154 | }
1155 |
1156 | int16_t
1157 | tvb_get_ntohis(tvbuff_t *tvb, const int offset)
1158 | {
1159 | const uint8_t *ptr;
1160 |
1161 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1162 | return pntohu16(ptr);
1163 | }
1164 |
1165 | uint32_t
1166 | tvb_get_ntoh24(tvbuff_t *tvb, const int offset)
1167 | {
1168 | const uint8_t *ptr;
1169 |
1170 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1171 | return pntohu24(ptr);
1172 | }
1173 |
1174 | int32_t
1175 | tvb_get_ntohi24(tvbuff_t *tvb, const int offset)
1176 | {
1177 | uint32_t ret;
1178 |
1179 | ret = ws_sign_ext32(tvb_get_ntoh24(tvb, offset), 24);
1180 |
1181 | return (int32_t)ret;
1182 | }
1183 |
1184 | uint32_t
1185 | tvb_get_ntohl(tvbuff_t *tvb, const int offset)
1186 | {
1187 | const uint8_t *ptr;
1188 |
1189 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1190 | return pntohu32(ptr);
1191 | }
1192 |
1193 | int32_t
1194 | tvb_get_ntohil(tvbuff_t *tvb, const int offset)
1195 | {
1196 | const uint8_t *ptr;
1197 |
1198 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1199 | return pntohu32(ptr);
1200 | }
1201 |
1202 | uint64_t
1203 | tvb_get_ntoh40(tvbuff_t *tvb, const int offset)
1204 | {
1205 | const uint8_t *ptr;
1206 |
1207 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1208 | return pntohu40(ptr);
1209 | }
1210 |
1211 | int64_t
1212 | tvb_get_ntohi40(tvbuff_t *tvb, const int offset)
1213 | {
1214 | uint64_t ret;
1215 |
1216 | ret = ws_sign_ext64(tvb_get_ntoh40(tvb, offset), 40);
1217 |
1218 | return (int64_t)ret;
1219 | }
1220 |
1221 | uint64_t
1222 | tvb_get_ntoh48(tvbuff_t *tvb, const int offset)
1223 | {
1224 | const uint8_t *ptr;
1225 |
1226 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1227 | return pntohu48(ptr);
1228 | }
1229 |
1230 | int64_t
1231 | tvb_get_ntohi48(tvbuff_t *tvb, const int offset)
1232 | {
1233 | uint64_t ret;
1234 |
1235 | ret = ws_sign_ext64(tvb_get_ntoh48(tvb, offset), 48);
1236 |
1237 | return (int64_t)ret;
1238 | }
1239 |
1240 | uint64_t
1241 | tvb_get_ntoh56(tvbuff_t *tvb, const int offset)
1242 | {
1243 | const uint8_t *ptr;
1244 |
1245 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1246 | return pntohu56(ptr);
1247 | }
1248 |
1249 | int64_t
1250 | tvb_get_ntohi56(tvbuff_t *tvb, const int offset)
1251 | {
1252 | uint64_t ret;
1253 |
1254 | ret = ws_sign_ext64(tvb_get_ntoh56(tvb, offset), 56);
1255 |
1256 | return (int64_t)ret;
1257 | }
1258 |
1259 | uint64_t
1260 | tvb_get_ntoh64(tvbuff_t *tvb, const int offset)
1261 | {
1262 | const uint8_t *ptr;
1263 |
1264 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1265 | return pntohu64(ptr);
1266 | }
1267 |
1268 | int64_t
1269 | tvb_get_ntohi64(tvbuff_t *tvb, const int offset)
1270 | {
1271 | const uint8_t *ptr;
1272 |
1273 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1274 | return pntohu64(ptr);
1275 | }
1276 |
1277 | uint16_t
1278 | tvb_get_uint16(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1279 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1280 | return tvb_get_letohs(tvb, offset);
1281 | } else {
1282 | return tvb_get_ntohs(tvb, offset);
1283 | }
1284 | }
1285 |
1286 | int16_t
1287 | tvb_get_int16(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1288 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1289 | return tvb_get_letohis(tvb, offset);
1290 | } else {
1291 | return tvb_get_ntohis(tvb, offset);
1292 | }
1293 | }
1294 |
1295 | uint32_t
1296 | tvb_get_uint24(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1297 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1298 | return tvb_get_letoh24(tvb, offset);
1299 | } else {
1300 | return tvb_get_ntoh24(tvb, offset);
1301 | }
1302 | }
1303 |
1304 | int32_t
1305 | tvb_get_int24(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1306 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1307 | return tvb_get_letohi24(tvb, offset);
1308 | } else {
1309 | return tvb_get_ntohi24(tvb, offset);
1310 | }
1311 | }
1312 |
1313 | uint32_t
1314 | tvb_get_uint32(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1315 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1316 | return tvb_get_letohl(tvb, offset);
1317 | } else {
1318 | return tvb_get_ntohl(tvb, offset);
1319 | }
1320 | }
1321 |
1322 | int32_t
1323 | tvb_get_int32(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1324 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1325 | return tvb_get_letohil(tvb, offset);
1326 | } else {
1327 | return tvb_get_ntohil(tvb, offset);
1328 | }
1329 | }
1330 |
1331 | uint64_t
1332 | tvb_get_uint40(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1333 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1334 | return tvb_get_letoh40(tvb, offset);
1335 | } else {
1336 | return tvb_get_ntoh40(tvb, offset);
1337 | }
1338 | }
1339 |
1340 | int64_t
1341 | tvb_get_int40(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1342 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1343 | return tvb_get_letohi40(tvb, offset);
1344 | } else {
1345 | return tvb_get_ntohi40(tvb, offset);
1346 | }
1347 | }
1348 |
1349 | uint64_t
1350 | tvb_get_uint48(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1351 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1352 | return tvb_get_letoh48(tvb, offset);
1353 | } else {
1354 | return tvb_get_ntoh48(tvb, offset);
1355 | }
1356 | }
1357 |
1358 | int64_t
1359 | tvb_get_int48(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1360 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1361 | return tvb_get_letohi48(tvb, offset);
1362 | } else {
1363 | return tvb_get_ntohi48(tvb, offset);
1364 | }
1365 | }
1366 |
1367 | uint64_t
1368 | tvb_get_uint56(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1369 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1370 | return tvb_get_letoh56(tvb, offset);
1371 | } else {
1372 | return tvb_get_ntoh56(tvb, offset);
1373 | }
1374 | }
1375 |
1376 | int64_t
1377 | tvb_get_int56(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1378 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1379 | return tvb_get_letohi56(tvb, offset);
1380 | } else {
1381 | return tvb_get_ntohi56(tvb, offset);
1382 | }
1383 | }
1384 |
1385 | uint64_t
1386 | tvb_get_uint64(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1387 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1388 | return tvb_get_letoh64(tvb, offset);
1389 | } else {
1390 | return tvb_get_ntoh64(tvb, offset);
1391 | }
1392 | }
1393 |
1394 | uint64_t
1395 | tvb_get_uint64_with_length(tvbuff_t *tvb, const int offset, unsigned length, const unsigned encoding)
1396 | {
1397 | uint64_t value;
1398 |
1399 | switch (length) {
1400 |
1401 | case 1:
1402 | value = tvb_get_uint8(tvb, offset);
1403 | break;
1404 |
1405 | case 2:
1406 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohs(tvb, offset)
1407 | : tvb_get_ntohs(tvb, offset);
1408 | break;
1409 |
1410 | case 3:
1411 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh24(tvb, offset)
1412 | : tvb_get_ntoh24(tvb, offset);
1413 | break;
1414 |
1415 | case 4:
1416 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letohl(tvb, offset)
1417 | : tvb_get_ntohl(tvb, offset);
1418 | break;
1419 |
1420 | case 5:
1421 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh40(tvb, offset)
1422 | : tvb_get_ntoh40(tvb, offset);
1423 | break;
1424 |
1425 | case 6:
1426 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh48(tvb, offset)
1427 | : tvb_get_ntoh48(tvb, offset);
1428 | break;
1429 |
1430 | case 7:
1431 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh56(tvb, offset)
1432 | : tvb_get_ntoh56(tvb, offset);
1433 | break;
1434 |
1435 | case 8:
1436 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1437 | : tvb_get_ntoh64(tvb, offset);
1438 | break;
1439 |
1440 | default:
1441 | if (length < 1) {
1442 | value = 0;
1443 | } else {
1444 | value = (encoding & ENC_LITTLE_ENDIAN0x80000000) ? tvb_get_letoh64(tvb, offset)
1445 | : tvb_get_ntoh64(tvb, offset);
1446 | }
1447 | break;
1448 | }
1449 | return value;
1450 | }
1451 |
1452 | int64_t
1453 | tvb_get_int64(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1454 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1455 | return tvb_get_letohi64(tvb, offset);
1456 | } else {
1457 | return tvb_get_ntohi64(tvb, offset);
1458 | }
1459 | }
1460 |
1461 | float
1462 | tvb_get_ieee_float(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1463 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1464 | return tvb_get_letohieee_float(tvb, offset);
1465 | } else {
1466 | return tvb_get_ntohieee_float(tvb, offset);
1467 | }
1468 | }
1469 |
1470 | double
1471 | tvb_get_ieee_double(tvbuff_t *tvb, const int offset, const unsigned encoding) {
1472 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1473 | return tvb_get_letohieee_double(tvb, offset);
1474 | } else {
1475 | return tvb_get_ntohieee_double(tvb, offset);
1476 | }
1477 | }
1478 |
1479 | /*
1480 | * Stuff for IEEE float handling on platforms that don't have IEEE
1481 | * format as the native floating-point format.
1482 | *
1483 | * For now, we treat only the VAX as such a platform.
1484 | *
1485 | * XXX - other non-IEEE boxes that can run UN*X include some Crays,
1486 | * and possibly other machines. However, I don't know whether there
1487 | * are any other machines that could run Wireshark and that don't use
1488 | * IEEE format. As far as I know, all of the main current and past
1489 | * commercial microprocessor families on which OSes that support
1490 | * Wireshark can run use IEEE format (x86, ARM, 68k, SPARC, MIPS,
1491 | * PA-RISC, Alpha, IA-64, and so on), and it appears that the official
1492 | * Linux port to System/390 and zArchitecture uses IEEE format floating-
1493 | * point rather than IBM hex floating-point (not a huge surprise), so
1494 | * I'm not sure that leaves any 32-bit or larger UN*X or Windows boxes,
1495 | * other than VAXes, that don't use IEEE format. If you're not running
1496 | * UN*X or Windows, the floating-point format is probably going to be
1497 | * the least of your problems in a port.
1498 | */
1499 |
1500 | #if defined(vax)
1501 |
1502 | #include <math.h>
1503 |
1504 | /*
1505 | * Single-precision.
1506 | */
1507 | #define IEEE_SP_NUMBER_WIDTH 32 /* bits in number */
1508 | #define IEEE_SP_EXP_WIDTH 8 /* bits in exponent */
1509 | #define IEEE_SP_MANTISSA_WIDTH 23 /* IEEE_SP_NUMBER_WIDTH - 1 - IEEE_SP_EXP_WIDTH */
1510 |
1511 | #define IEEE_SP_SIGN_MASK 0x80000000
1512 | #define IEEE_SP_EXPONENT_MASK 0x7F800000
1513 | #define IEEE_SP_MANTISSA_MASK 0x007FFFFF
1514 | #define IEEE_SP_INFINITY IEEE_SP_EXPONENT_MASK
1515 |
1516 | #define IEEE_SP_IMPLIED_BIT (1 << IEEE_SP_MANTISSA_WIDTH)
1517 | #define IEEE_SP_INFINITE ((1 << IEEE_SP_EXP_WIDTH) - 1)
1518 | #define IEEE_SP_BIAS ((1 << (IEEE_SP_EXP_WIDTH - 1)) - 1)
1519 |
1520 | static int
1521 | ieee_float_is_zero(const uint32_t w)
1522 | {
1523 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1524 | }
1525 |
1526 | static float
1527 | get_ieee_float(const uint32_t w)
1528 | {
1529 | long sign;
1530 | long exponent;
1531 | long mantissa;
1532 |
1533 | sign = w & IEEE_SP_SIGN_MASK;
1534 | exponent = w & IEEE_SP_EXPONENT_MASK;
1535 | mantissa = w & IEEE_SP_MANTISSA_MASK;
1536 |
1537 | if (ieee_float_is_zero(w)) {
1538 | /* number is zero, unnormalized, or not-a-number */
1539 | return 0.0;
1540 | }
1541 | #if 0
1542 | /*
1543 | * XXX - how to handle this?
1544 | */
1545 | if (IEEE_SP_INFINITY == exponent) {
1546 | /*
1547 | * number is positive or negative infinity, or a special value
1548 | */
1549 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1550 | }
1551 | #endif
1552 |
1553 | exponent = ((exponent >> IEEE_SP_MANTISSA_WIDTH) - IEEE_SP_BIAS) -
1554 | IEEE_SP_MANTISSA_WIDTH;
1555 | mantissa |= IEEE_SP_IMPLIED_BIT;
1556 |
1557 | if (sign)
1558 | return -mantissa * pow(2, exponent);
1559 | else
1560 | return mantissa * pow(2, exponent);
1561 | }
1562 |
1563 | /*
1564 | * Double-precision.
1565 | * We assume that if you don't have IEEE floating-point, you have a
1566 | * compiler that understands 64-bit integral quantities.
1567 | */
1568 | #define IEEE_DP_NUMBER_WIDTH 64 /* bits in number */
1569 | #define IEEE_DP_EXP_WIDTH 11 /* bits in exponent */
1570 | #define IEEE_DP_MANTISSA_WIDTH 52 /* IEEE_DP_NUMBER_WIDTH - 1 - IEEE_DP_EXP_WIDTH */
1571 |
1572 | #define IEEE_DP_SIGN_MASK INT64_C(0x8000000000000000)0x8000000000000000L
1573 | #define IEEE_DP_EXPONENT_MASK INT64_C(0x7FF0000000000000)0x7FF0000000000000L
1574 | #define IEEE_DP_MANTISSA_MASK INT64_C(0x000FFFFFFFFFFFFF)0x000FFFFFFFFFFFFFL
1575 | #define IEEE_DP_INFINITY IEEE_DP_EXPONENT_MASK
1576 |
1577 | #define IEEE_DP_IMPLIED_BIT (INT64_C(1)1L << IEEE_DP_MANTISSA_WIDTH)
1578 | #define IEEE_DP_INFINITE ((1 << IEEE_DP_EXP_WIDTH) - 1)
1579 | #define IEEE_DP_BIAS ((1 << (IEEE_DP_EXP_WIDTH - 1)) - 1)
1580 |
1581 | static int
1582 | ieee_double_is_zero(const uint64_t w)
1583 | {
1584 | return ((w & ~IEEE_SP_SIGN_MASK) == 0);
1585 | }
1586 |
1587 | static double
1588 | get_ieee_double(const uint64_t w)
1589 | {
1590 | int64_t sign;
1591 | int64_t exponent;
1592 | int64_t mantissa;
1593 |
1594 | sign = w & IEEE_DP_SIGN_MASK;
1595 | exponent = w & IEEE_DP_EXPONENT_MASK;
1596 | mantissa = w & IEEE_DP_MANTISSA_MASK;
1597 |
1598 | if (ieee_double_is_zero(w)) {
1599 | /* number is zero, unnormalized, or not-a-number */
1600 | return 0.0;
1601 | }
1602 | #if 0
1603 | /*
1604 | * XXX - how to handle this?
1605 | */
1606 | if (IEEE_DP_INFINITY == exponent) {
1607 | /*
1608 | * number is positive or negative infinity, or a special value
1609 | */
1610 | return (sign? MINUS_INFINITY: PLUS_INFINITY);
1611 | }
1612 | #endif
1613 |
1614 | exponent = ((exponent >> IEEE_DP_MANTISSA_WIDTH) - IEEE_DP_BIAS) -
1615 | IEEE_DP_MANTISSA_WIDTH;
1616 | mantissa |= IEEE_DP_IMPLIED_BIT;
1617 |
1618 | if (sign)
1619 | return -mantissa * pow(2, exponent);
1620 | else
1621 | return mantissa * pow(2, exponent);
1622 | }
1623 | #endif
1624 |
1625 | /*
1626 | * Fetches an IEEE single-precision floating-point number, in
1627 | * big-endian form, and returns a "float".
1628 | *
1629 | * XXX - should this be "double", in case there are IEEE single-
1630 | * precision numbers that won't fit in some platform's native
1631 | * "float" format?
1632 | */
1633 | float
1634 | tvb_get_ntohieee_float(tvbuff_t *tvb, const int offset)
1635 | {
1636 | #if defined(vax)
1637 | return get_ieee_float(tvb_get_ntohl(tvb, offset));
1638 | #else
1639 | union {
1640 | float f;
1641 | uint32_t w;
1642 | } ieee_fp_union;
1643 |
1644 | ieee_fp_union.w = tvb_get_ntohl(tvb, offset);
1645 | return ieee_fp_union.f;
1646 | #endif
1647 | }
1648 |
1649 | /*
1650 | * Fetches an IEEE double-precision floating-point number, in
1651 | * big-endian form, and returns a "double".
1652 | */
1653 | double
1654 | tvb_get_ntohieee_double(tvbuff_t *tvb, const int offset)
1655 | {
1656 | #if defined(vax)
1657 | union {
1658 | uint32_t w[2];
1659 | uint64_t dw;
1660 | } ieee_fp_union;
1661 | #else
1662 | union {
1663 | double d;
1664 | uint32_t w[2];
1665 | } ieee_fp_union;
1666 | #endif
1667 |
1668 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1669 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset);
1670 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset+4);
1671 | #else
1672 | ieee_fp_union.w[0] = tvb_get_ntohl(tvb, offset+4);
1673 | ieee_fp_union.w[1] = tvb_get_ntohl(tvb, offset);
1674 | #endif
1675 | #if defined(vax)
1676 | return get_ieee_double(ieee_fp_union.dw);
1677 | #else
1678 | return ieee_fp_union.d;
1679 | #endif
1680 | }
1681 |
1682 | uint16_t
1683 | tvb_get_letohs(tvbuff_t *tvb, const int offset)
1684 | {
1685 | const uint8_t *ptr;
1686 |
1687 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1688 | return pletohu16(ptr);
1689 | }
1690 |
1691 | int16_t
1692 | tvb_get_letohis(tvbuff_t *tvb, const int offset)
1693 | {
1694 | const uint8_t *ptr;
1695 |
1696 | ptr = fast_ensure_contiguous(tvb, offset, 2);
1697 | return pletohu16(ptr);
1698 | }
1699 |
1700 | uint32_t
1701 | tvb_get_letoh24(tvbuff_t *tvb, const int offset)
1702 | {
1703 | const uint8_t *ptr;
1704 |
1705 | ptr = fast_ensure_contiguous(tvb, offset, 3);
1706 | return pletohu24(ptr);
1707 | }
1708 |
1709 | int32_t
1710 | tvb_get_letohi24(tvbuff_t *tvb, const int offset)
1711 | {
1712 | uint32_t ret;
1713 |
1714 | ret = ws_sign_ext32(tvb_get_letoh24(tvb, offset), 24);
1715 |
1716 | return (int32_t)ret;
1717 | }
1718 |
1719 | uint32_t
1720 | tvb_get_letohl(tvbuff_t *tvb, const int offset)
1721 | {
1722 | const uint8_t *ptr;
1723 |
1724 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1725 | return pletohu32(ptr);
1726 | }
1727 |
1728 | int32_t
1729 | tvb_get_letohil(tvbuff_t *tvb, const int offset)
1730 | {
1731 | const uint8_t *ptr;
1732 |
1733 | ptr = fast_ensure_contiguous(tvb, offset, 4);
1734 | return pletohu32(ptr);
1735 | }
1736 |
1737 | uint64_t
1738 | tvb_get_letoh40(tvbuff_t *tvb, const int offset)
1739 | {
1740 | const uint8_t *ptr;
1741 |
1742 | ptr = fast_ensure_contiguous(tvb, offset, 5);
1743 | return pletohu40(ptr);
1744 | }
1745 |
1746 | int64_t
1747 | tvb_get_letohi40(tvbuff_t *tvb, const int offset)
1748 | {
1749 | uint64_t ret;
1750 |
1751 | ret = ws_sign_ext64(tvb_get_letoh40(tvb, offset), 40);
1752 |
1753 | return (int64_t)ret;
1754 | }
1755 |
1756 | uint64_t
1757 | tvb_get_letoh48(tvbuff_t *tvb, const int offset)
1758 | {
1759 | const uint8_t *ptr;
1760 |
1761 | ptr = fast_ensure_contiguous(tvb, offset, 6);
1762 | return pletohu48(ptr);
1763 | }
1764 |
1765 | int64_t
1766 | tvb_get_letohi48(tvbuff_t *tvb, const int offset)
1767 | {
1768 | uint64_t ret;
1769 |
1770 | ret = ws_sign_ext64(tvb_get_letoh48(tvb, offset), 48);
1771 |
1772 | return (int64_t)ret;
1773 | }
1774 |
1775 | uint64_t
1776 | tvb_get_letoh56(tvbuff_t *tvb, const int offset)
1777 | {
1778 | const uint8_t *ptr;
1779 |
1780 | ptr = fast_ensure_contiguous(tvb, offset, 7);
1781 | return pletohu56(ptr);
1782 | }
1783 |
1784 | int64_t
1785 | tvb_get_letohi56(tvbuff_t *tvb, const int offset)
1786 | {
1787 | uint64_t ret;
1788 |
1789 | ret = ws_sign_ext64(tvb_get_letoh56(tvb, offset), 56);
1790 |
1791 | return (int64_t)ret;
1792 | }
1793 |
1794 | uint64_t
1795 | tvb_get_letoh64(tvbuff_t *tvb, const int offset)
1796 | {
1797 | const uint8_t *ptr;
1798 |
1799 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1800 | return pletohu64(ptr);
1801 | }
1802 |
1803 | int64_t
1804 | tvb_get_letohi64(tvbuff_t *tvb, const int offset)
1805 | {
1806 | const uint8_t *ptr;
1807 |
1808 | ptr = fast_ensure_contiguous(tvb, offset, 8);
1809 | return pletohu64(ptr);
1810 | }
1811 |
1812 | /*
1813 | * Fetches an IEEE single-precision floating-point number, in
1814 | * little-endian form, and returns a "float".
1815 | *
1816 | * XXX - should this be "double", in case there are IEEE single-
1817 | * precision numbers that won't fit in some platform's native
1818 | * "float" format?
1819 | */
1820 | float
1821 | tvb_get_letohieee_float(tvbuff_t *tvb, const int offset)
1822 | {
1823 | #if defined(vax)
1824 | return get_ieee_float(tvb_get_letohl(tvb, offset));
1825 | #else
1826 | union {
1827 | float f;
1828 | uint32_t w;
1829 | } ieee_fp_union;
1830 |
1831 | ieee_fp_union.w = tvb_get_letohl(tvb, offset);
1832 | return ieee_fp_union.f;
1833 | #endif
1834 | }
1835 |
1836 | /*
1837 | * Fetches an IEEE double-precision floating-point number, in
1838 | * little-endian form, and returns a "double".
1839 | */
1840 | double
1841 | tvb_get_letohieee_double(tvbuff_t *tvb, const int offset)
1842 | {
1843 | #if defined(vax)
1844 | union {
1845 | uint32_t w[2];
1846 | uint64_t dw;
1847 | } ieee_fp_union;
1848 | #else
1849 | union {
1850 | double d;
1851 | uint32_t w[2];
1852 | } ieee_fp_union;
1853 | #endif
1854 |
1855 | #if G_BYTE_ORDER1234 == G_BIG_ENDIAN4321
1856 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset+4);
1857 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset);
1858 | #else
1859 | ieee_fp_union.w[0] = tvb_get_letohl(tvb, offset);
1860 | ieee_fp_union.w[1] = tvb_get_letohl(tvb, offset+4);
1861 | #endif
1862 | #if defined(vax)
1863 | return get_ieee_double(ieee_fp_union.dw);
1864 | #else
1865 | return ieee_fp_union.d;
1866 | #endif
1867 | }
1868 |
1869 | /* This function is a slight misnomer. It accepts all encodings that are
1870 | * ASCII "enough", which means encodings that are the same as US-ASCII
1871 | * for textual representations of dates and hex bytes; i.e., the same
1872 | * for the hex digits and Z (in practice, all alphanumerics), and the
1873 | * four separators ':' '-' '.' and ' '
1874 | * That means that any encoding that keeps the ISO/IEC 646 invariant
1875 | * characters the same (including the T.61 8 bit encoding and multibyte
1876 | * encodings like EUC-KR and GB18030) are OK, even if they replace characters
1877 | * like '$' '#' and '\' with national variants, but not encodings like UTF-16
1878 | * that include extra null bytes.
1879 | * For our current purposes, the unpacked GSM 7-bit default alphabet (but not
1880 | * all National Language Shift Tables) also satisfies this requirement, but
1881 | * note that it does *not* keep all ISO/IEC 646 invariant characters the same.
1882 | * If this internal function gets used for additional purposes than currently,
1883 | * the set of encodings that it accepts could change.
1884 | * */
1885 | static inline void
1886 | validate_single_byte_ascii_encoding(const unsigned encoding)
1887 | {
1888 | const unsigned enc = encoding & ~ENC_CHARENCODING_MASK0x0000FFFE;
1889 |
1890 | switch (enc) {
1891 | case ENC_UTF_160x00000004:
1892 | case ENC_UCS_20x00000006:
1893 | case ENC_UCS_40x00000008:
1894 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
1895 | case ENC_ASCII_7BITS0x00000034:
1896 | case ENC_EBCDIC0x0000002E:
1897 | case ENC_EBCDIC_CP0370x00000038:
1898 | case ENC_EBCDIC_CP5000x00000060:
1899 | case ENC_BCD_DIGITS_0_90x00000044:
1900 | case ENC_KEYPAD_ABC_TBCD0x00000046:
1901 | case ENC_KEYPAD_BC_TBCD0x00000048:
1902 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
1903 | case ENC_APN_STR0x00000054:
1904 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
1905 | REPORT_DISSECTOR_BUG("Invalid string encoding type passed to tvb_get_string_XXX")proto_report_dissector_bug("Invalid string encoding type passed to tvb_get_string_XXX" );
1906 | break;
1907 | default:
1908 | break;
1909 | }
1910 | /* make sure something valid was set */
1911 | if (enc == 0)
1912 | REPORT_DISSECTOR_BUG("No string encoding type passed to tvb_get_string_XXX")proto_report_dissector_bug("No string encoding type passed to tvb_get_string_XXX" );
1913 | }
1914 |
1915 | GByteArray*
1916 | tvb_get_string_bytes(tvbuff_t *tvb, const int offset, const int length,
1917 | const unsigned encoding, GByteArray *bytes, int *endoff)
1918 | {
1919 | char *ptr;
1920 | const char *begin;
1921 | const char *end = NULL((void*)0);
1922 | GByteArray *retval = NULL((void*)0);
1923 |
1924 | validate_single_byte_ascii_encoding(encoding);
1925 |
1926 | ptr = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1927 | begin = ptr;
1928 |
1929 | if (endoff) *endoff = offset;
1930 |
1931 | while (*begin == ' ') begin++;
1932 |
1933 | if (*begin && bytes) {
1934 | if (hex_str_to_bytes_encoding(begin, bytes, &end, encoding, false0)) {
1935 | if (bytes->len > 0) {
1936 | if (endoff) *endoff = offset + (int)(end - ptr);
1937 | retval = bytes;
1938 | }
1939 | }
1940 | }
1941 |
1942 | wmem_free(NULL((void*)0), ptr);
1943 |
1944 | return retval;
1945 | }
1946 |
1947 | static bool_Bool
1948 | parse_month_name(const char *name, int *tm_mon)
1949 | {
1950 | static const char months[][4] = { "Jan", "Feb", "Mar", "Apr", "May",
1951 | "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
1952 | for (int i = 0; i < 12; i++) {
1953 | if (memcmp(months[i], name, 4) == 0) {
1954 | *tm_mon = i;
1955 | return true1;
1956 | }
1957 | }
1958 | return false0;
1959 | }
1960 |
1961 | /*
1962 | * Is the character a WSP character, as per RFC 5234? (space or tab).
1963 | */
1964 | #define IS_WSP(c)((c) == ' ' || (c) == '\t') ((c) == ' ' || (c) == '\t')
1965 |
1966 | /* support hex-encoded time values? */
1967 | nstime_t*
1968 | tvb_get_string_time(tvbuff_t *tvb, const int offset, const int length,
1969 | const unsigned encoding, nstime_t *ns, int *endoff)
1970 | {
1971 | char *begin;
1972 | const char *ptr;
1973 | const char *end = NULL((void*)0);
1974 | int num_chars = 0;
1975 | int utc_offset = 0;
1976 |
1977 | validate_single_byte_ascii_encoding(encoding);
1978 |
1979 | DISSECTOR_ASSERT(ns)((void) ((ns) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 1979, "ns"))));
1980 |
1981 | begin = (char*) tvb_get_raw_string(NULL((void*)0), tvb, offset, length);
1982 | ptr = begin;
1983 |
1984 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
1985 | ptr++;
1986 |
1987 | if (*ptr) {
1988 | if ((encoding & ENC_ISO_8601_DATE_TIME0x00030000) == ENC_ISO_8601_DATE_TIME0x00030000) {
1989 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME))) {
1990 |
1991 |
1992 | goto fail;
1993 | }
1994 | } else if ((encoding & ENC_ISO_8601_DATE_TIME_BASIC0x00100000) == ENC_ISO_8601_DATE_TIME_BASIC0x00100000) {
1995 | if (!(end = iso8601_to_nstime(ns, ptr, ISO8601_DATETIME_BASIC))) {
1996 |
1997 |
1998 | goto fail;
1999 | }
2000 | } else {
2001 | struct tm tm;
2002 |
2003 | memset(&tm, 0, sizeof(tm));
2004 | tm.tm_isdst = -1;
2005 | ns->secs = 0;
2006 | ns->nsecs = 0;
2007 |
2008 | /* note: sscanf is known to be inconsistent across platforms with respect
2009 | to whether a %n is counted as a return value or not, so we have to use
2010 | '>=' a lot */
2011 | if (encoding & ENC_ISO_8601_DATE0x00010000) {
2012 | /* 2014-04-07 */
2013 | if (sscanf(ptr, "%d-%d-%d%n",
2014 | &tm.tm_year,
2015 | &tm.tm_mon,
2016 | &tm.tm_mday,
2017 | &num_chars) >= 3)
2018 | {
2019 | end = ptr + num_chars;
2020 | tm.tm_mon--;
2021 | if (tm.tm_year > 1900) tm.tm_year -= 1900;
2022 | } else {
2023 | goto fail;
2024 | }
2025 | }
2026 | else if (encoding & ENC_ISO_8601_TIME0x00020000) {
2027 | /* 2014-04-07 */
2028 | if (sscanf(ptr, "%d:%d:%d%n",
2029 | &tm.tm_hour,
2030 | &tm.tm_min,
2031 | &tm.tm_sec,
2032 | &num_chars) >= 2)
2033 | {
2034 | /* what should we do about day/month/year? */
2035 | /* setting it to "now" for now */
2036 | time_t time_now = time(NULL((void*)0));
2037 | struct tm *tm_now = gmtime(&time_now);
2038 | if (tm_now != NULL((void*)0)) {
2039 | tm.tm_year = tm_now->tm_year;
2040 | tm.tm_mon = tm_now->tm_mon;
2041 | tm.tm_mday = tm_now->tm_mday;
2042 | } else {
2043 | /* The second before the Epoch */
2044 | tm.tm_year = 69;
2045 | tm.tm_mon = 12;
2046 | tm.tm_mday = 31;
2047 | }
2048 | end = ptr + num_chars;
2049 | } else {
2050 | goto fail;
2051 | }
2052 | }
2053 | else if (encoding & ENC_IMF_DATE_TIME0x00040000) {
2054 | /*
2055 | * Match [dow,] day month year hh:mm[:ss] with
2056 | * two-digit years (RFC 822) or four-digit
2057 | * years (RFCs 1123, 2822, 5822). Skip
2058 | * the day of week since it is locale
2059 | * dependent and does not affect the resulting
2060 | * date anyway.
2061 | */
2062 | if (g_ascii_isalpha(ptr[0])((g_ascii_table[(guchar) (ptr[0])] & G_ASCII_ALPHA) != 0) && g_ascii_isalpha(ptr[1])((g_ascii_table[(guchar) (ptr[1])] & G_ASCII_ALPHA) != 0) && g_ascii_isalpha(ptr[2])((g_ascii_table[(guchar) (ptr[2])] & G_ASCII_ALPHA) != 0) && ptr[3] == ',')
2063 | ptr += 4; /* Skip day of week. */
2064 |
2065 | /*
2066 | * Parse the day-of-month and month
2067 | * name.
2068 | */
2069 | char month_name[4] = { 0 };
2070 |
2071 | if (sscanf(ptr, "%d %3s%n",
2072 | &tm.tm_mday,
2073 | month_name,
2074 | &num_chars) < 2)
2075 | {
2076 | /* Not matched. */
2077 | goto fail;
2078 | }
2079 | if (!parse_month_name(month_name, &tm.tm_mon)) {
2080 | goto fail;
2081 | }
2082 | ptr += num_chars;
2083 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2084 | ptr++;
2085 |
2086 | /*
2087 | * Scan the year. Treat 2-digit years
2088 | * differently from 4-digit years.
2089 | */
2090 | uint32_t year;
2091 | const char *yearendp;
2092 |
2093 | if (!ws_strtou32(ptr, &yearendp, &year)) {
2094 | goto fail;
2095 | }
2096 | if (!IS_WSP(*yearendp)((*yearendp) == ' ' || (*yearendp) == '\t')) {
2097 | /* Not followed by WSP. */
2098 | goto fail;
2099 | }
2100 | if (yearendp - ptr < 2) {
2101 | /* 1-digit year. Error. */
2102 | goto fail;
2103 | }
2104 | if (yearendp - ptr == 2) {
2105 | /*
2106 | * 2-digit year.
2107 | *
2108 | * Match RFC 2822/RFC 5322 behavior;
2109 | * add 2000 to years from 0 to
2110 | * 49 and 1900 to uears from 50
2111 | * to 99.
2112 | */
2113 | if (year <= 49) {
2114 | year += 2000;
2115 | } else {
2116 | year += 1900;
2117 | }
2118 | } else if (yearendp - ptr == 3) {
2119 | /*
2120 | * 3-digit year.
2121 | *
2122 | * Match RFC 2822/RFC 5322 behavior;
2123 | * add 1900 to the year.
2124 | */
2125 | year += 1900;
2126 | }
2127 | tm.tm_year = year - 1900;
2128 | ptr = yearendp;
2129 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2130 | ptr++;
2131 |
2132 | /* Parse the time. */
2133 | if (sscanf(ptr, "%d:%d%n:%d%n",
2134 | &tm.tm_hour,
2135 | &tm.tm_min,
2136 | &num_chars,
2137 | &tm.tm_sec,
2138 | &num_chars) < 2)
2139 | {
2140 | goto fail;
2141 | }
2142 | ptr += num_chars;
2143 | while (IS_WSP(*ptr)((*ptr) == ' ' || (*ptr) == '\t'))
2144 | ptr++;
2145 |
2146 | /*
2147 | * Parse the time zone.
2148 | * Check for obs-zone values first.
2149 | */
2150 | if (g_ascii_strncasecmp(ptr, "UT", 2) == 0)
2151 | {
2152 | ptr += 2;
2153 | }
2154 | else if (g_ascii_strncasecmp(ptr, "GMT", 3) == 0)
2155 | {
2156 | ptr += 3;
2157 | }
2158 | else
2159 | {
2160 | char sign;
2161 | int off_hr;
2162 | int off_min;
2163 |
2164 | if (sscanf(ptr, "%c%2d%2d%n",
2165 | &sign,
2166 | &off_hr,
2167 | &off_min,
2168 | &num_chars) < 3)
2169 | {
2170 | goto fail;
2171 | }
2172 |
2173 | /*
2174 | * If sign is '+', there's a positive
2175 | * UTC offset.
2176 | *
2177 | * If sign is '-', there's a negative
2178 | * UTC offset.
2179 | *
2180 | * Otherwise, that's an invalid UTC
2181 | * offset string.
2182 | */
2183 | if (sign == '+')
2184 | utc_offset += (off_hr * 3600) + (off_min * 60);
2185 | else if (sign == '-')
2186 | utc_offset -= (off_hr * 3600) + (off_min * 60);
2187 | else {
2188 | /* Sign must be + or - */
2189 | goto fail;
2190 | }
2191 | ptr += num_chars;
2192 | }
2193 | end = ptr;
2194 | }
2195 | ns->secs = mktime_utc(&tm);
2196 | if (ns->secs == (time_t)-1 && errno(*__errno_location ()) != 0) {
2197 | goto fail;
2198 | }
2199 | ns->secs += utc_offset;
2200 | }
2201 | } else {
2202 | /* Empty string */
2203 | goto fail;
2204 | }
2205 |
2206 | if (endoff)
2207 | *endoff = (int)(offset + (end - begin));
2208 | wmem_free(NULL((void*)0), begin);
2209 | return ns;
2210 |
2211 | fail:
2212 | wmem_free(NULL((void*)0), begin);
2213 | return NULL((void*)0);
2214 | }
2215 |
2216 | /* Fetch an IPv4 address, in network byte order.
2217 | * We do *not* convert them to host byte order; we leave them in
2218 | * network byte order. */
2219 | uint32_t
2220 | tvb_get_ipv4(tvbuff_t *tvb, const int offset)
2221 | {
2222 | const uint8_t *ptr;
2223 | uint32_t addr;
2224 |
2225 | ptr = fast_ensure_contiguous(tvb, offset, sizeof(uint32_t));
2226 | memcpy(&addr, ptr, sizeof addr);
2227 | return addr;
2228 | }
2229 |
2230 | /* Fetch an IPv6 address. */
2231 | void
2232 | tvb_get_ipv6(tvbuff_t *tvb, const int offset, ws_in6_addr *addr)
2233 | {
2234 | const uint8_t *ptr;
2235 |
2236 | ptr = ensure_contiguous(tvb, offset, sizeof(*addr));
2237 | memcpy(addr, ptr, sizeof *addr);
2238 | }
2239 |
2240 | /*
2241 | * These routines return the length of the address in bytes on success
2242 | * and -1 if the prefix length is too long.
2243 | */
2244 | int
2245 | tvb_get_ipv4_addr_with_prefix_len(tvbuff_t *tvb, int offset, ws_in4_addr *addr,
2246 | uint32_t prefix_len)
2247 | {
2248 | uint8_t addr_len;
2249 |
2250 | if (prefix_len > 32)
2251 | return -1;
2252 |
2253 | addr_len = (prefix_len + 7) / 8;
2254 | *addr = 0;
2255 | tvb_memcpy(tvb, addr, offset, addr_len);
2256 | if (prefix_len % 8)
2257 | ((uint8_t*)addr)[addr_len - 1] &= ((0xff00 >> (prefix_len % 8)) & 0xff);
2258 | return addr_len;
2259 | }
2260 |
2261 | /*
2262 | * These routines return the length of the address in bytes on success
2263 | * and -1 if the prefix length is too long.
2264 | */
2265 | int
2266 | tvb_get_ipv6_addr_with_prefix_len(tvbuff_t *tvb, int offset, ws_in6_addr *addr,
2267 | uint32_t prefix_len)
2268 | {
2269 | uint32_t addr_len;
2270 |
2271 | if (prefix_len > 128)
2272 | return -1;
2273 |
2274 | addr_len = (prefix_len + 7) / 8;
2275 | memset(addr->bytes, 0, 16);
2276 | tvb_memcpy(tvb, addr->bytes, offset, addr_len);
2277 | if (prefix_len % 8) {
2278 | addr->bytes[addr_len - 1] &=
2279 | ((0xff00 >> (prefix_len % 8)) & 0xff);
2280 | }
2281 |
2282 | return addr_len;
2283 | }
2284 |
2285 | /* Fetch a GUID. */
2286 | void
2287 | tvb_get_ntohguid(tvbuff_t *tvb, const int offset, e_guid_t *guid)
2288 | {
2289 | const uint8_t *ptr = ensure_contiguous(tvb, offset, GUID_LEN16);
2290 |
2291 | guid->data1 = pntohu32(ptr + 0);
2292 | guid->data2 = pntohu16(ptr + 4);
2293 | guid->data3 = pntohu16(ptr + 6);
2294 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2295 | }
2296 |
2297 | void
2298 | tvb_get_letohguid(tvbuff_t *tvb, const int offset, e_guid_t *guid)
2299 | {
2300 | const uint8_t *ptr = ensure_contiguous(tvb, offset, GUID_LEN16);
2301 |
2302 | guid->data1 = pletohu32(ptr + 0);
2303 | guid->data2 = pletohu16(ptr + 4);
2304 | guid->data3 = pletohu16(ptr + 6);
2305 | memcpy(guid->data4, ptr + 8, sizeof guid->data4);
2306 | }
2307 |
2308 | void
2309 | tvb_get_guid(tvbuff_t *tvb, const int offset, e_guid_t *guid, const unsigned encoding)
2310 | {
2311 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2312 | tvb_get_letohguid(tvb, offset, guid);
2313 | } else {
2314 | tvb_get_ntohguid(tvb, offset, guid);
2315 | }
2316 | }
2317 |
2318 | static const uint8_t bit_mask8[] = {
2319 | 0x00,
2320 | 0x01,
2321 | 0x03,
2322 | 0x07,
2323 | 0x0f,
2324 | 0x1f,
2325 | 0x3f,
2326 | 0x7f,
2327 | 0xff
2328 | };
2329 |
2330 |
2331 | /* Get a variable amount of bits
2332 | *
2333 | * Return a byte array with bit limited data.
2334 | * When encoding is ENC_BIG_ENDIAN, the data is aligned to the left.
2335 | * When encoding is ENC_LITTLE_ENDIAN, the data is aligned to the right.
2336 | */
2337 | uint8_t *
2338 | tvb_get_bits_array(wmem_allocator_t *scope, tvbuff_t *tvb, const int bit_offset,
2339 | size_t no_of_bits, size_t *data_length, const unsigned encoding)
2340 | {
2341 | tvbuff_t *sub_tvb;
2342 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
1 | Assuming the condition is true | →
2 | ← | Taking true branch | →
2343 | sub_tvb = tvb_new_octet_right_aligned(tvb, bit_offset, (int32_t) no_of_bits);
3 | ← | Calling 'tvb_new_octet_right_aligned' | →
2344 | } else {
2345 | sub_tvb = tvb_new_octet_aligned(tvb, bit_offset, (int32_t) no_of_bits);
2346 | }
2347 | *data_length = tvb_reported_length(sub_tvb);
2348 | return (uint8_t*)tvb_memdup(scope, sub_tvb, 0, *data_length);
2349 | }
2350 |
2351 | /* Get 1 - 8 bits */
2352 | uint8_t
2353 | tvb_get_bits8(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits)
2354 | {
2355 | DISSECTOR_ASSERT_HINT(no_of_bits <= 8, "Too many bits requested for 8-bit return type")((void) ((no_of_bits <= 8) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2355 , "no_of_bits <= 8", "Too many bits requested for 8-bit return type" ))));
2356 | return (uint8_t)_tvb_get_bits64(tvb, bit_offset, no_of_bits);
2357 | }
2358 |
2359 | /* Get 1 - 16 bits */
2360 | uint16_t
2361 | tvb_get_bits16(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2362 | {
2363 | DISSECTOR_ASSERT_HINT(no_of_bits <= 16, "Too many bits requested for 16-bit return type")((void) ((no_of_bits <= 16) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2363 , "no_of_bits <= 16", "Too many bits requested for 16-bit return type" ))));
2364 | return (uint16_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2365 | }
2366 |
2367 | /* Get 1 - 32 bits */
2368 | uint32_t
2369 | tvb_get_bits32(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2370 | {
2371 | DISSECTOR_ASSERT_HINT(no_of_bits <= 32, "Too many bits requested for 32-bit return type")((void) ((no_of_bits <= 32) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2371 , "no_of_bits <= 32", "Too many bits requested for 32-bit return type" ))));
2372 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2373 | }
2374 |
2375 | /* Get 1 - 64 bits */
2376 | uint64_t
2377 | tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2378 | {
2379 | DISSECTOR_ASSERT_HINT(no_of_bits <= 64, "Too many bits requested for 64-bit return type")((void) ((no_of_bits <= 64) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\" (%s)", "epan/tvbuff.c", 2379 , "no_of_bits <= 64", "Too many bits requested for 64-bit return type" ))));
2380 |
2381 | /* encoding determines bit numbering within octet array */
2382 | if (encoding & ENC_LITTLE_ENDIAN0x80000000) {
2383 | return _tvb_get_bits64_le(tvb, bit_offset, no_of_bits);
2384 | } else {
2385 | return _tvb_get_bits64(tvb, bit_offset, no_of_bits);
2386 | }
2387 | }
2388 |
2389 | /*
2390 | * This function will dissect a sequence of bits that does not need to be byte aligned; the bits
2391 | * set will be shown in the tree as ..10 10.. and the integer value returned if return_value is set.
2392 | * Offset should be given in bits from the start of the tvb.
2393 | * Bits within octet are numbered from MSB (0) to LSB (7). Bit at bit_offset is return value most significant bit.
2394 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2395 | */
2396 | static uint64_t
2397 | _tvb_get_bits64(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits)
2398 | {
2399 | uint64_t value;
2400 | unsigned octet_offset = bit_offset >> 3;
2401 | uint8_t required_bits_in_first_octet = 8 - (bit_offset % 8);
2402 |
2403 | if(required_bits_in_first_octet > total_no_of_bits)
2404 | {
2405 | /* the required bits don't extend to the end of the first octet */
2406 | uint8_t right_shift = required_bits_in_first_octet - total_no_of_bits;
2407 | value = (tvb_get_uint8(tvb, octet_offset) >> right_shift) & bit_mask8[total_no_of_bits % 8];
2408 | }
2409 | else
2410 | {
2411 | uint8_t remaining_bit_length = total_no_of_bits;
2412 |
2413 | /* get the bits up to the first octet boundary */
2414 | value = 0;
2415 | required_bits_in_first_octet %= 8;
2416 | if(required_bits_in_first_octet != 0)
2417 | {
2418 | value = tvb_get_uint8(tvb, octet_offset) & bit_mask8[required_bits_in_first_octet];
2419 | remaining_bit_length -= required_bits_in_first_octet;
2420 | octet_offset ++;
2421 | }
2422 | /* take the biggest words, shorts or octets that we can */
2423 | while (remaining_bit_length > 7)
2424 | {
2425 | switch (remaining_bit_length >> 4)
2426 | {
2427 | case 0:
2428 | /* 8 - 15 bits. (note that 0 - 7 would have dropped out of the while() loop) */
2429 | value <<= 8;
2430 | value += tvb_get_uint8(tvb, octet_offset);
2431 | remaining_bit_length -= 8;
2432 | octet_offset ++;
2433 | break;
2434 |
2435 | case 1:
2436 | /* 16 - 31 bits */
2437 | value <<= 16;
2438 | value += tvb_get_ntohs(tvb, octet_offset);
2439 | remaining_bit_length -= 16;
2440 | octet_offset += 2;
2441 | break;
2442 |
2443 | case 2:
2444 | case 3:
2445 | /* 32 - 63 bits */
2446 | value <<= 32;
2447 | value += tvb_get_ntohl(tvb, octet_offset);
2448 | remaining_bit_length -= 32;
2449 | octet_offset += 4;
2450 | break;
2451 |
2452 | default:
2453 | /* 64 bits (or more???) */
2454 | value = tvb_get_ntoh64(tvb, octet_offset);
2455 | remaining_bit_length -= 64;
2456 | octet_offset += 8;
2457 | break;
2458 | }
2459 | }
2460 | /* get bits from any partial octet at the tail */
2461 | if(remaining_bit_length)
2462 | {
2463 | value <<= remaining_bit_length;
2464 | value += (tvb_get_uint8(tvb, octet_offset) >> (8 - remaining_bit_length));
2465 | }
2466 | }
2467 | return value;
2468 | }
2469 |
2470 | /*
2471 | * Offset should be given in bits from the start of the tvb.
2472 | * Bits within octet are numbered from LSB (0) to MSB (7). Bit at bit_offset is return value least significant bit.
2473 | * The function tolerates requests for more than 64 bits, but will only return the least significant 64 bits.
2474 | */
2475 | static uint64_t
2476 | _tvb_get_bits64_le(tvbuff_t *tvb, unsigned bit_offset, const int total_no_of_bits)
2477 | {
2478 | uint64_t value = 0;
2479 | unsigned octet_offset = bit_offset / 8;
2480 | int remaining_bits = total_no_of_bits;
2481 | int shift = 0;
2482 |
2483 | if (remaining_bits > 64)
2484 | {
2485 | remaining_bits = 64;
2486 | }
2487 |
2488 | if (bit_offset % 8)
2489 | {
2490 | /* not aligned, extract bits from first octet */
2491 | shift = 8 - (bit_offset % 8);
2492 | value = tvb_get_uint8(tvb, octet_offset) >> (bit_offset % 8);
2493 | if (shift > remaining_bits)
2494 | {
2495 | /* keep only the requested bits */
2496 | value &= (UINT64_C(1)1UL << remaining_bits) - 1;
2497 | remaining_bits = 0;
2498 | }
2499 | else
2500 | {
2501 | remaining_bits -= shift;
2502 | }
2503 | octet_offset++;
2504 | }
2505 |
2506 | while (remaining_bits > 0)
2507 | {
2508 | /* take the biggest words, shorts or octets that we can */
2509 | if (remaining_bits >= 32)
2510 | {
2511 | value |= ((uint64_t)tvb_get_letohl(tvb, octet_offset) << shift);
2512 | shift += 32;
2513 | remaining_bits -= 32;
2514 | octet_offset += 4;
2515 | }
2516 | else if (remaining_bits >= 16)
2517 | {
2518 | value |= ((uint64_t)tvb_get_letohs(tvb, octet_offset) << shift);
2519 | shift += 16;
2520 | remaining_bits -= 16;
2521 | octet_offset += 2;
2522 | }
2523 | else if (remaining_bits >= 8)
2524 | {
2525 | value |= ((uint64_t)tvb_get_uint8(tvb, octet_offset) << shift);
2526 | shift += 8;
2527 | remaining_bits -= 8;
2528 | octet_offset += 1;
2529 | }
2530 | else
2531 | {
2532 | unsigned mask = (1 << remaining_bits) - 1;
2533 | value |= (((uint64_t)tvb_get_uint8(tvb, octet_offset) & mask) << shift);
2534 | shift += remaining_bits;
2535 | remaining_bits = 0;
2536 | octet_offset += 1;
2537 | }
2538 | }
2539 | return value;
2540 | }
2541 |
2542 | /* Get 1 - 32 bits (should be deprecated as same as tvb_get_bits32??) */
2543 | uint32_t
2544 | tvb_get_bits(tvbuff_t *tvb, const unsigned bit_offset, const int no_of_bits, const unsigned encoding)
2545 | {
2546 | return (uint32_t)tvb_get_bits64(tvb, bit_offset, no_of_bits, encoding);
2547 | }
2548 |
2549 | static int
2550 | tvb_find_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, uint8_t needle)
2551 | {
2552 | const uint8_t *ptr;
2553 | const uint8_t *result;
2554 |
2555 | ptr = ensure_contiguous_unsigned(tvb, abs_offset, limit); /* tvb_get_ptr() */
2556 | if (!ptr)
2557 | return -1;
2558 |
2559 | result = (const uint8_t *) memchr(ptr, needle, limit);
2560 | if (!result)
2561 | return -1;
2562 |
2563 | return (int) ((result - ptr) + abs_offset);
2564 | }
2565 |
2566 | /* Find first occurrence of needle in tvbuff, starting at offset. Searches
2567 | * at most maxlength number of bytes; if maxlength is -1, searches to
2568 | * end of tvbuff.
2569 | * Returns the offset of the found needle, or -1 if not found.
2570 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
2571 | * in that case, -1 will be returned if the boundary is reached before
2572 | * finding needle. */
2573 | int
2574 | tvb_find_uint8(tvbuff_t *tvb, const unsigned offset, const int maxlength, const uint8_t needle)
2575 | {
2576 | const uint8_t *result;
2577 | unsigned limit = 0;
2578 | int exception;
2579 |
2580 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2580, "tvb && tvb->initialized" ))));
2581 |
2582 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2583 | if (exception)
2584 | THROW(exception)except_throw(1, (exception), ((void*)0));
2585 |
2586 | /* Only search to end of tvbuff, w/o throwing exception. */
2587 | if (maxlength >= 0 && limit > (unsigned) maxlength) {
2588 | /* Maximum length doesn't go past end of tvbuff; search
2589 | to that value. */
2590 | limit = (unsigned) maxlength;
2591 | }
2592 |
2593 | /* If we have real data, perform our search now. */
2594 | if (tvb->real_data) {
2595 | result = (const uint8_t *)memchr(tvb->real_data + offset, needle, limit);
2596 | if (result == NULL((void*)0)) {
2597 | return -1;
2598 | }
2599 | else {
2600 | return (int) (result - tvb->real_data);
2601 | }
2602 | }
2603 |
2604 | if (tvb->ops->tvb_find_uint8)
2605 | return tvb->ops->tvb_find_uint8(tvb, offset, limit, needle);
2606 |
2607 | return tvb_find_uint8_generic(tvb, offset, limit, needle);
2608 | }
2609 |
2610 | /* Same as tvb_find_uint8() with 16bit needle. */
2611 | int
2612 | tvb_find_uint16(tvbuff_t *tvb, const int offset, const int maxlength,
2613 | const uint16_t needle)
2614 | {
2615 | unsigned abs_offset = 0;
2616 | unsigned limit = 0;
2617 | int exception;
2618 |
2619 | exception = compute_offset_and_remaining(tvb, offset, &abs_offset, &limit);
2620 | if (exception)
2621 | THROW(exception)except_throw(1, (exception), ((void*)0));
2622 |
2623 | /* Only search to end of tvbuff, w/o throwing exception. */
2624 | if (maxlength >= 0 && limit > (unsigned) maxlength) {
2625 | /* Maximum length doesn't go past end of tvbuff; search
2626 | to that value. */
2627 | limit = (unsigned) maxlength;
2628 | }
2629 |
2630 | const uint8_t needle1 = ((needle & 0xFF00) >> 8);
2631 | const uint8_t needle2 = ((needle & 0x00FF) >> 0);
2632 | unsigned searched_bytes = 0;
2633 | unsigned pos = abs_offset;
2634 |
2635 | do {
2636 | int offset1 =
2637 | tvb_find_uint8(tvb, pos, limit - searched_bytes, needle1);
2638 | int offset2 = -1;
2639 |
2640 | if (offset1 == -1) {
2641 | return -1;
2642 | }
2643 |
2644 | searched_bytes = (unsigned)offset1 - abs_offset + 1;
2645 |
2646 | if (searched_bytes >= limit) {
2647 | return -1;
2648 | }
2649 |
2650 | offset2 = tvb_find_uint8(tvb, offset1 + 1, 1, needle2);
2651 |
2652 | searched_bytes += 1;
2653 |
2654 | if (offset2 != -1) {
2655 | if (searched_bytes > limit) {
2656 | return -1;
2657 | }
2658 | return offset1;
2659 | }
2660 |
2661 | pos = offset1 + 1;
2662 | } while (searched_bytes < limit);
2663 |
2664 | return -1;
2665 | }
2666 |
2667 | static inline int
2668 | tvb_ws_mempbrk_uint8_generic(tvbuff_t *tvb, unsigned abs_offset, unsigned limit, const ws_mempbrk_pattern* pattern, unsigned char *found_needle)
2669 | {
2670 | const uint8_t *ptr;
2671 | const uint8_t *result;
2672 |
2673 | ptr = ensure_contiguous_unsigned(tvb, abs_offset, limit); /* tvb_get_ptr */
2674 | if (!ptr)
2675 | return -1;
2676 |
2677 | result = ws_mempbrk_exec(ptr, limit, pattern, found_needle);
2678 | if (!result)
2679 | return -1;
2680 |
2681 | return (int) ((result - ptr) + abs_offset);
2682 | }
2683 |
2684 |
2685 | /* Find first occurrence of any of the pattern chars in tvbuff, starting at offset.
2686 | * Searches at most maxlength number of bytes; if maxlength is -1, searches
2687 | * to end of tvbuff.
2688 | * Returns the offset of the found needle, or -1 if not found.
2689 | * Will not throw an exception, even if maxlength exceeds boundary of tvbuff;
2690 | * in that case, -1 will be returned if the boundary is reached before
2691 | * finding needle. */
2692 | int
2693 | tvb_ws_mempbrk_pattern_uint8(tvbuff_t *tvb, const unsigned offset, const int maxlength,
2694 | const ws_mempbrk_pattern* pattern, unsigned char *found_needle)
2695 | {
2696 | const uint8_t *result;
2697 | unsigned limit = 0;
2698 | int exception;
2699 |
2700 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2700, "tvb && tvb->initialized" ))));
2701 |
2702 | exception = validate_offset_and_remaining(tvb, offset, &limit);
2703 | if (exception)
2704 | THROW(exception)except_throw(1, (exception), ((void*)0));
2705 |
2706 | /* Only search to end of tvbuff, w/o throwing exception. */
2707 | if (limit > (unsigned) maxlength) {
2708 | /* Maximum length doesn't go past end of tvbuff; search
2709 | to that value. */
2710 | limit = maxlength;
2711 | }
2712 |
2713 | /* If we have real data, perform our search now. */
2714 | if (tvb->real_data) {
2715 | result = ws_mempbrk_exec(tvb->real_data + offset, limit, pattern, found_needle);
2716 | if (result == NULL((void*)0)) {
2717 | return -1;
2718 | }
2719 | else {
2720 | return (int) (result - tvb->real_data);
2721 | }
2722 | }
2723 |
2724 | if (tvb->ops->tvb_ws_mempbrk_pattern_uint8)
2725 | return tvb->ops->tvb_ws_mempbrk_pattern_uint8(tvb, offset, limit, pattern, found_needle);
2726 |
2727 | return tvb_ws_mempbrk_uint8_generic(tvb, offset, limit, pattern, found_needle);
2728 | }
2729 |
2730 | /* Find size of stringz (NUL-terminated string) by looking for terminating
2731 | * NUL. The size of the string includes the terminating NUL.
2732 | *
2733 | * If the NUL isn't found, it throws the appropriate exception.
2734 | */
2735 | unsigned
2736 | tvb_strsize(tvbuff_t *tvb, const unsigned offset)
2737 | {
2738 | int nul_offset;
2739 |
2740 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2740, "tvb && tvb->initialized" ))));
2741 |
2742 | validate_offset(tvb, offset);
2743 | nul_offset = tvb_find_uint8(tvb, offset, -1, 0);
2744 | if (nul_offset == -1) {
2745 | /*
2746 | * OK, we hit the end of the tvbuff, so we should throw
2747 | * an exception.
2748 | */
2749 | if (tvb->length < tvb->contained_length) {
2750 | THROW(BoundsError)except_throw(1, (1), ((void*)0));
2751 | } else if (tvb->flags & TVBUFF_FRAGMENT0x00000001) {
2752 | THROW(FragmentBoundsError)except_throw(1, (4), ((void*)0));
2753 | } else if (tvb->length < tvb->reported_length) {
2754 | THROW(ContainedBoundsError)except_throw(1, (2), ((void*)0));
2755 | } else {
2756 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2757 | }
2758 | }
2759 | return (nul_offset - offset) + 1;
2760 | }
2761 |
2762 | /* UTF-16/UCS-2 version of tvb_strsize */
2763 | /* Returns number of bytes including the (two-bytes) null terminator */
2764 | unsigned
2765 | tvb_unicode_strsize(tvbuff_t *tvb, const unsigned offset)
2766 | {
2767 | unsigned cur_offset = offset;
2768 | gunichar2 uchar;
2769 |
2770 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2770, "tvb && tvb->initialized" ))));
2771 |
2772 | /* Note: don't use tvb_find_uint16 because it must be aligned */
2773 | do {
2774 | /* Endianness doesn't matter when looking for null */
2775 | uchar = tvb_get_ntohs(tvb, cur_offset);
2776 | /* Make sure we don't overflow */
2777 | if (ckd_add(&cur_offset, cur_offset, 2)__builtin_add_overflow((cur_offset), (2), (&cur_offset))) {
2778 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
2779 | }
2780 | } while(uchar != 0);
2781 |
2782 | return cur_offset - offset;
2783 | }
2784 |
2785 | /* Find length of string by looking for end of string ('\0'), up to
2786 | * 'maxlength' characters'; if 'maxlength' is -1, searches to end
2787 | * of tvbuff.
2788 | * Returns -1 if 'maxlength' reached before finding EOS. */
2789 | int
2790 | tvb_strnlen(tvbuff_t *tvb, const int offset, const unsigned maxlength)
2791 | {
2792 | int result_offset;
2793 | unsigned abs_offset = 0, junk_length;
2794 |
2795 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 2795, "tvb && tvb->initialized" ))));
2796 |
2797 | check_offset_length(tvb, offset, 0, &abs_offset, &junk_length);
2798 |
2799 | /* TODO - this and tvb_find_uint8 need variants that return a bool
2800 | * and set an unsigned offset to the value if true. */
2801 | result_offset = tvb_find_uint8(tvb, abs_offset, maxlength, 0);
2802 |
2803 | if (result_offset == -1) {
2804 | return -1;
2805 | }
2806 | else {
2807 | return result_offset - abs_offset;
2808 | }
2809 | }
2810 |
2811 | /*
2812 | * Implement strneql etc
2813 | */
2814 |
2815 | /*
2816 | * Call strncmp after checking if enough chars left, returning 0 if
2817 | * it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
2818 | */
2819 | int
2820 | tvb_strneql(tvbuff_t *tvb, const unsigned offset, const char *str, const size_t size)
2821 | {
2822 | const uint8_t *ptr;
2823 |
2824 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
2825 |
2826 | if (ptr) {
2827 | int cmp = strncmp((const char *)ptr, str, size);
2828 |
2829 | /*
2830 | * Return 0 if equal, -1 otherwise.
2831 | */
2832 | return (cmp == 0 ? 0 : -1);
2833 | } else {
2834 | /*
2835 | * Not enough characters in the tvbuff to match the
2836 | * string.
2837 | */
2838 | return -1;
2839 | }
2840 | }
2841 |
2842 | /*
2843 | * Call g_ascii_strncasecmp after checking if enough chars left, returning
2844 | * 0 if it returns 0 (meaning "equal") and -1 otherwise, otherwise return -1.
2845 | */
2846 | int
2847 | tvb_strncaseeql(tvbuff_t *tvb, const unsigned offset, const char *str, const size_t size)
2848 | {
2849 | const uint8_t *ptr;
2850 |
2851 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
2852 |
2853 | if (ptr) {
2854 | int cmp = g_ascii_strncasecmp((const char *)ptr, str, size);
2855 |
2856 | /*
2857 | * Return 0 if equal, -1 otherwise.
2858 | */
2859 | return (cmp == 0 ? 0 : -1);
2860 | } else {
2861 | /*
2862 | * Not enough characters in the tvbuff to match the
2863 | * string.
2864 | */
2865 | return -1;
2866 | }
2867 | }
2868 |
2869 | /*
2870 | * Check that the tvbuff contains at least size bytes, starting at
2871 | * offset, and that those bytes are equal to str. Return 0 for success
2872 | * and -1 for error. This function does not throw an exception.
2873 | */
2874 | int
2875 | tvb_memeql(tvbuff_t *tvb, const unsigned offset, const uint8_t *str, size_t size)
2876 | {
2877 | const uint8_t *ptr;
2878 |
2879 | ptr = ensure_contiguous_unsigned_no_exception(tvb, offset, (unsigned)size, NULL((void*)0));
2880 |
2881 | if (ptr) {
2882 | int cmp = memcmp(ptr, str, size);
2883 |
2884 | /*
2885 | * Return 0 if equal, -1 otherwise.
2886 | */
2887 | return (cmp == 0 ? 0 : -1);
2888 | } else {
2889 | /*
2890 | * Not enough characters in the tvbuff to match the
2891 | * string.
2892 | */
2893 | return -1;
2894 | }
2895 | }
2896 |
2897 | /**
2898 | * Format the data in the tvb from offset for size.
2899 | */
2900 | char *
2901 | tvb_format_text(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned size)
2902 | {
2903 | const uint8_t *ptr;
2904 |
2905 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
2906 | return format_text(scope, (const char*)ptr, size);
2907 | }
2908 |
2909 | /*
2910 | * Format the data in the tvb from offset for length ...
2911 | */
2912 | char *
2913 | tvb_format_text_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const unsigned offset, const unsigned size)
2914 | {
2915 | const uint8_t *ptr;
2916 |
2917 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
2918 | return format_text_wsp(allocator, (const char*)ptr, size);
2919 | }
2920 |
2921 | /**
2922 | * Like "tvb_format_text()", but for null-padded strings; don't show
2923 | * the null padding characters as "\000".
2924 | */
2925 | char *
2926 | tvb_format_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned size)
2927 | {
2928 | const uint8_t *ptr, *p;
2929 | unsigned stringlen;
2930 |
2931 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
2932 | for (p = ptr, stringlen = 0; stringlen < size && *p != '\0'; p++, stringlen++)
2933 | ;
2934 | return format_text(scope, (const char*)ptr, stringlen);
2935 | }
2936 |
2937 | /*
2938 | * Like "tvb_format_text_wsp()", but for null-padded strings; don't show
2939 | * the null padding characters as "\000".
2940 | */
2941 | char *
2942 | tvb_format_stringzpad_wsp(wmem_allocator_t* allocator, tvbuff_t *tvb, const unsigned offset, const unsigned size)
2943 | {
2944 | const uint8_t *ptr, *p;
2945 | unsigned stringlen;
2946 |
2947 | ptr = ensure_contiguous(tvb, offset, size);
2948 | for (p = ptr, stringlen = 0; stringlen < size && *p != '\0'; p++, stringlen++)
2949 | ;
2950 | return format_text_wsp(allocator, (const char*)ptr, stringlen);
2951 | }
2952 |
2953 | /*
2954 | * All string functions below take a scope as an argument.
2955 | *
2956 | *
2957 | * If scope is NULL, memory is allocated with g_malloc() and user must
2958 | * explicitly free it with g_free().
2959 | * If scope is not NULL, memory is allocated with the corresponding pool
2960 | * lifetime.
2961 | *
2962 | * All functions throw an exception if the tvbuff ends before the string
2963 | * does.
2964 | */
2965 |
2966 | /*
2967 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
2968 | * of bytes referred to by the tvbuff, offset, and length as an ASCII string,
2969 | * with all bytes with the high-order bit set being invalid, and return a
2970 | * pointer to a UTF-8 string, allocated using the wmem scope.
2971 | *
2972 | * Octets with the highest bit set will be converted to the Unicode
2973 | * REPLACEMENT CHARACTER.
2974 | */
2975 | static uint8_t *
2976 | tvb_get_ascii_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
2977 | {
2978 | const uint8_t *ptr;
2979 |
2980 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
2981 | return get_ascii_string(scope, ptr, length);
2982 | }
2983 |
2984 | /*
2985 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation table,
2986 | * treat the string of bytes referred to by the tvbuff, offset, and length
2987 | * as a string encoded using one octet per character, with octets with the
2988 | * high-order bit clear being mapped by the translation table to 2-byte
2989 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
2990 | * CHARACTER) and octets with the high-order bit set being mapped to
2991 | * REPLACEMENT CHARACTER, and return a pointer to a UTF-8 string,
2992 | * allocated using the wmem scope.
2993 | *
2994 | * Octets with the highest bit set will be converted to the Unicode
2995 | * REPLACEMENT CHARACTER.
2996 | */
2997 | static uint8_t *
2998 | tvb_get_iso_646_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[0x80])
2999 | {
3000 | const uint8_t *ptr;
3001 |
3002 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3003 | return get_iso_646_string(scope, ptr, length, table);
3004 | }
3005 |
3006 | /*
3007 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3008 | * of bytes referred to by the tvbuff, the offset. and the length as a UTF-8
3009 | * string, and return a pointer to a UTF-8 string, allocated using the wmem
3010 | * scope, with all ill-formed sequences replaced with the Unicode REPLACEMENT
3011 | * CHARACTER according to the recommended "best practices" given in the Unicode
3012 | * Standard and specified by W3C/WHATWG.
3013 | *
3014 | * Note that in conformance with the Unicode Standard, this treats three
3015 | * byte sequences corresponding to UTF-16 surrogate halves (paired or unpaired)
3016 | * and two byte overlong encodings of 7-bit ASCII characters as invalid and
3017 | * substitutes REPLACEMENT CHARACTER for them. Explicit support for nonstandard
3018 | * derivative encoding formats (e.g. CESU-8, Java Modified UTF-8, WTF-8) could
3019 | * be added later.
3020 | */
3021 | static uint8_t *
3022 | tvb_get_utf_8_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, const unsigned length)
3023 | {
3024 | const uint8_t *ptr;
3025 |
3026 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3027 | return get_utf_8_string(scope, ptr, length);
3028 | }
3029 |
3030 | /*
3031 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3032 | * of bytes referred to by the tvbuff, the offset, and the length as a
3033 | * raw string, and return a pointer to that string, allocated using the
3034 | * wmem scope. This means a null is appended at the end, but no replacement
3035 | * checking is done otherwise, unlike tvb_get_utf_8_string().
3036 | *
3037 | * Also, this one allows a length of -1 to mean get all, but does not
3038 | * allow a negative offset.
3039 | */
3040 | static inline uint8_t *
3041 | tvb_get_raw_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int length)
3042 | {
3043 | uint8_t *strbuf;
3044 | int abs_length = length;
3045 |
3046 | DISSECTOR_ASSERT(offset >= 0)((void) ((offset >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3046, "offset >= 0" ))));
3047 | DISSECTOR_ASSERT(abs_length >= -1)((void) ((abs_length >= -1) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3047, "abs_length >= -1" ))));
3048 |
3049 | if (abs_length < 0)
3050 | abs_length = tvb->length - offset;
3051 |
3052 | tvb_ensure_bytes_exist(tvb, (unsigned)offset, abs_length);
3053 | strbuf = (uint8_t *)wmem_alloc(scope, abs_length + 1);
3054 | tvb_memcpy(tvb, strbuf, offset, abs_length);
3055 | strbuf[abs_length] = '\0';
3056 | return strbuf;
3057 | }
3058 |
3059 | /*
3060 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the string
3061 | * of bytes referred to by the tvbuff, the offset, and the length as an
3062 | * ISO 8859/1 string, and return a pointer to a UTF-8 string, allocated
3063 | * using the wmem scope.
3064 | */
3065 | static uint8_t *
3066 | tvb_get_string_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3067 | {
3068 | const uint8_t *ptr;
3069 |
3070 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3071 | return get_8859_1_string(scope, ptr, length);
3072 | }
3073 |
3074 | /*
3075 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3076 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3077 | * and the length as a string encoded using one octet per character, with
3078 | * octets with the high-order bit clear being ASCII and octets with the
3079 | * high-order bit set being mapped by the translation table to 2-byte
3080 | * Unicode Basic Multilingual Plane characters (including REPLACEMENT
3081 | * CHARACTER), and return a pointer to a UTF-8 string, allocated with the
3082 | * wmem scope.
3083 | */
3084 | static uint8_t *
3085 | tvb_get_string_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[0x80])
3086 | {
3087 | const uint8_t *ptr;
3088 |
3089 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3090 | return get_unichar2_string(scope, ptr, length, table);
3091 | }
3092 |
3093 | /*
3094 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3095 | * giving the byte order, treat the string of bytes referred to by the
3096 | * tvbuff, the offset, and the length as a UCS-2 encoded string in
3097 | * the byte order in question, containing characters from the Basic
3098 | * Multilingual Plane (plane 0) of Unicode, and return a pointer to a
3099 | * UTF-8 string, allocated with the wmem scope.
3100 | *
3101 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3102 | * optionally with ENC_BOM.
3103 | *
3104 | * Specify length in bytes.
3105 | *
3106 | * XXX - should map lead and trail surrogate values to REPLACEMENT
3107 | * CHARACTERs (0xFFFD)?
3108 | * XXX - if there are an odd number of bytes, should put a
3109 | * REPLACEMENT CHARACTER at the end.
3110 | */
3111 | static uint8_t *
3112 | tvb_get_ucs_2_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3113 | {
3114 | const uint8_t *ptr;
3115 |
3116 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3117 | return get_ucs_2_string(scope, ptr, length, encoding);
3118 | }
3119 |
3120 | /*
3121 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3122 | * giving the byte order, treat the string of bytes referred to by the
3123 | * tvbuff, the offset, and the length as a UTF-16 encoded string in
3124 | * the byte order in question, and return a pointer to a UTF-8 string,
3125 | * allocated with the wmem scope.
3126 | *
3127 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3128 | * optionally with ENC_BOM.
3129 | *
3130 | * Specify length in bytes.
3131 | *
3132 | * XXX - should map surrogate errors to REPLACEMENT CHARACTERs (0xFFFD).
3133 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3134 | * XXX - if there are an odd number of bytes, should put a
3135 | * REPLACEMENT CHARACTER at the end.
3136 | */
3137 | static uint8_t *
3138 | tvb_get_utf_16_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3139 | {
3140 | const uint8_t *ptr;
3141 |
3142 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3143 | return get_utf_16_string(scope, ptr, length, encoding);
3144 | }
3145 |
3146 | /*
3147 | * Given a wmem scope, a tvbuff, an offset, a length, and an encoding
3148 | * giving the byte order, treat the string of bytes referred to by the
3149 | * tvbuff, the offset, and the length as a UCS-4 encoded string in
3150 | * the byte order in question, and return a pointer to a UTF-8 string,
3151 | * allocated with the wmem scope.
3152 | *
3153 | * Encoding parameter should be ENC_BIG_ENDIAN or ENC_LITTLE_ENDIAN,
3154 | * optionally with ENC_BOM.
3155 | *
3156 | * Specify length in bytes
3157 | *
3158 | * XXX - should map lead and trail surrogate values to a "substitute"
3159 | * UTF-8 character?
3160 | * XXX - should map code points > 10FFFF to REPLACEMENT CHARACTERs.
3161 | * XXX - if the number of bytes isn't a multiple of 4, should put a
3162 | * REPLACEMENT CHARACTER at the end.
3163 | */
3164 | static char *
3165 | tvb_get_ucs_4_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned length, const unsigned encoding)
3166 | {
3167 | const uint8_t *ptr;
3168 |
3169 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3170 | return (char*)get_ucs_4_string(scope, ptr, length, encoding);
3171 | }
3172 |
3173 | char *
3174 | tvb_get_ts_23_038_7bits_string_packed(wmem_allocator_t *scope, tvbuff_t *tvb,
3175 | const unsigned bit_offset, unsigned no_of_chars)
3176 | {
3177 | unsigned in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3178 | unsigned length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3179 | const uint8_t *ptr;
3180 |
3181 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3181, "tvb && tvb->initialized" ))));
3182 |
3183 | ptr = ensure_contiguous_unsigned(tvb, in_offset, length);
3184 | return (char*)get_ts_23_038_7bits_string_packed(scope, ptr, bit_offset, no_of_chars);
3185 | }
3186 |
3187 | char *
3188 | tvb_get_ts_23_038_7bits_string_unpacked(wmem_allocator_t *scope, tvbuff_t *tvb,
3189 | const unsigned offset, unsigned length)
3190 | {
3191 | const uint8_t *ptr;
3192 |
3193 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3193, "tvb && tvb->initialized" ))));
3194 |
3195 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3196 | return (char*)get_ts_23_038_7bits_string_unpacked(scope, ptr, length);
3197 | }
3198 |
3199 | char *
3200 | tvb_get_etsi_ts_102_221_annex_a_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3201 | const unsigned offset, unsigned length)
3202 | {
3203 | const uint8_t *ptr;
3204 |
3205 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3205, "tvb && tvb->initialized" ))));
3206 |
3207 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3208 | return (char*)get_etsi_ts_102_221_annex_a_string(scope, ptr, length);
3209 | }
3210 |
3211 | char *
3212 | tvb_get_ascii_7bits_string(wmem_allocator_t *scope, tvbuff_t *tvb,
3213 | const unsigned bit_offset, unsigned no_of_chars)
3214 | {
3215 | unsigned in_offset = bit_offset >> 3; /* Current pointer to the input buffer */
3216 | unsigned length = ((no_of_chars + 1) * 7 + (bit_offset & 0x07)) >> 3;
3217 | const uint8_t *ptr;
3218 |
3219 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3219, "tvb && tvb->initialized" ))));
3220 |
3221 | ptr = ensure_contiguous_unsigned(tvb, in_offset, length);
3222 | return (char*)get_ascii_7bits_string(scope, ptr, bit_offset, no_of_chars);
3223 | }
3224 |
3225 | /*
3226 | * Given a wmem scope, a tvbuff, an offset, a length, and a translation
3227 | * table, treat the string of bytes referred to by the tvbuff, the offset,
3228 | * and the length as a string encoded using one octet per character, with
3229 | * octets being mapped by the translation table to 2-byte Unicode Basic
3230 | * Multilingual Plane characters (including REPLACEMENT CHARACTER), and
3231 | * return a pointer to a UTF-8 string, allocated with the wmem scope.
3232 | */
3233 | static uint8_t *
3234 | tvb_get_nonascii_unichar2_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length, const gunichar2 table[256])
3235 | {
3236 | const uint8_t *ptr;
3237 |
3238 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3239 | return get_nonascii_unichar2_string(scope, ptr, length, table);
3240 | }
3241 |
3242 | /*
3243 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3244 | * referred to by the tvbuff, offset, and length as a GB18030 encoded string,
3245 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3246 | * converted having substituted REPLACEMENT CHARACTER according to the
3247 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3248 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3249 | *
3250 | * As expected, this will also decode GBK and GB2312 strings.
3251 | */
3252 | static uint8_t *
3253 | tvb_get_gb18030_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3254 | {
3255 | const uint8_t *ptr;
3256 |
3257 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3258 | return get_gb18030_string(scope, ptr, length);
3259 | }
3260 |
3261 | /*
3262 | * Given a wmem scope, a tvbuff, an offset, and a length, treat the bytes
3263 | * referred to by the tvbuff, offset, and length as a EUC-KR encoded string,
3264 | * and return a pointer to a UTF-8 string, allocated with the wmem scope,
3265 | * converted having substituted REPLACEMENT CHARACTER according to the
3266 | * Unicode Standard 5.22 U+FFFD Substitution for Conversion.
3267 | * ( https://www.unicode.org/versions/Unicode13.0.0/ch05.pdf )
3268 | */
3269 | static uint8_t *
3270 | tvb_get_euc_kr_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3271 | {
3272 | const uint8_t *ptr;
3273 |
3274 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3275 | return get_euc_kr_string(scope, ptr, length);
3276 | }
3277 |
3278 | static uint8_t *
3279 | tvb_get_t61_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3280 | {
3281 | const uint8_t *ptr;
3282 |
3283 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3284 | return get_t61_string(scope, ptr, length);
3285 | }
3286 |
3287 | /*
3288 | * Encoding tables for BCD strings.
3289 | */
3290 | static const dgt_set_t Dgt0_9_bcd = {
3291 | {
3292 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3293 | '0','1','2','3','4','5','6','7','8','9','?','?','?','?','?','?'
3294 | }
3295 | };
3296 |
3297 | static const dgt_set_t Dgt_keypad_abc_tbcd = {
3298 | {
3299 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3300 | '0','1','2','3','4','5','6','7','8','9','*','#','a','b','c','?'
3301 | }
3302 | };
3303 |
3304 | static const dgt_set_t Dgt_ansi_tbcd = {
3305 | {
3306 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3307 | '0','1','2','3','4','5','6','7','8','9','?','B','C','*','#','?'
3308 | }
3309 | };
3310 |
3311 | static const dgt_set_t Dgt_dect_standard_4bits_tbcd = {
3312 | {
3313 | /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
3314 | '0','1','2','3','4','5','6','7','8','9','?',' ','?','?','?','?'
3315 | }
3316 | };
3317 |
3318 | static uint8_t *
3319 | tvb_get_apn_string(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3320 | unsigned length)
3321 | {
3322 | wmem_strbuf_t *str;
3323 |
3324 | /*
3325 | * This is a domain name.
3326 | *
3327 | * 3GPP TS 23.003, section 19.4.2 "Fully Qualified Domain Names
3328 | * (FQDNs)", subsection 19.4.2.1 "General", says:
3329 | *
3330 | * The encoding of any identifier used as part of a Fully
3331 | * Qualified Domain Name (FQDN) shall follow the Name Syntax
3332 | * defined in IETF RFC 2181 [18], IETF RFC 1035 [19] and
3333 | * IETF RFC 1123 [20]. An FQDN consists of one or more
3334 | * labels. Each label is coded as a one octet length field
3335 | * followed by that number of octets coded as 8 bit ASCII
3336 | * characters.
3337 | *
3338 | * so this does not appear to use full-blown DNS compression -
3339 | * the upper 2 bits of the length don't indicate that it's a
3340 | * pointer or an extended label (RFC 2673).
3341 | */
3342 | str = wmem_strbuf_new_sized(scope, length + 1);
3343 | if (length > 0) {
3344 | const uint8_t *ptr;
3345 |
3346 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3347 |
3348 | for (;;) {
3349 | unsigned label_len;
3350 |
3351 | /*
3352 | * Process this label.
3353 | */
3354 | label_len = *ptr;
3355 | ptr++;
3356 | length--;
3357 |
3358 | while (label_len != 0) {
3359 | uint8_t ch;
3360 |
3361 | if (length == 0)
3362 | goto end;
3363 |
3364 | ch = *ptr;
3365 | if (ch < 0x80)
3366 | wmem_strbuf_append_c(str, ch);
3367 | else
3368 | wmem_strbuf_append_unichar_repl(str)wmem_strbuf_append_unichar(str, 0x00FFFD);
3369 | ptr++;
3370 | label_len--;
3371 | length--;
3372 | }
3373 |
3374 | if (length == 0)
3375 | goto end;
3376 |
3377 | wmem_strbuf_append_c(str, '.');
3378 | }
3379 | }
3380 |
3381 | end:
3382 | return (uint8_t *) wmem_strbuf_finalize(str);
3383 | }
3384 |
3385 | static uint8_t *
3386 | tvb_get_dect_standard_8bits_string(wmem_allocator_t *scope, tvbuff_t *tvb, unsigned offset, unsigned length)
3387 | {
3388 | const uint8_t *ptr;
3389 |
3390 | ptr = ensure_contiguous_unsigned(tvb, offset, length);
3391 | return get_dect_standard_8bits_string(scope, ptr, length);
3392 | }
3393 |
3394 | /*
3395 | * Given a tvbuff, an offset, a length, and an encoding, allocate a
3396 | * buffer big enough to hold a non-null-terminated string of that length
3397 | * at that offset, plus a trailing '\0', copy into the buffer the
3398 | * string as converted from the appropriate encoding to UTF-8, and
3399 | * return a pointer to the string.
3400 | */
3401 | uint8_t *
3402 | tvb_get_string_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3403 | const unsigned length, const unsigned encoding)
3404 | {
3405 | uint8_t *strptr;
3406 | bool_Bool odd, skip_first;
3407 |
3408 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3408, "tvb && tvb->initialized" ))));
3409 |
3410 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3411 |
3412 | case ENC_ASCII0x00000000:
3413 | default:
3414 | /*
3415 | * For now, we treat bogus values as meaning
3416 | * "ASCII" rather than reporting an error,
3417 | * for the benefit of old dissectors written
3418 | * when the last argument to proto_tree_add_item()
3419 | * was a bool for the byte order, not an
3420 | * encoding value, and passed non-zero values
3421 | * other than true to mean "little-endian".
3422 | */
3423 | strptr = tvb_get_ascii_string(scope, tvb, offset, length);
3424 | break;
3425 |
3426 | case ENC_UTF_80x00000002:
3427 | strptr = tvb_get_utf_8_string(scope, tvb, offset, length);
3428 | break;
3429 |
3430 | case ENC_UTF_160x00000004:
3431 | strptr = tvb_get_utf_16_string(scope, tvb, offset, length,
3432 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3433 | break;
3434 |
3435 | case ENC_UCS_20x00000006:
3436 | strptr = tvb_get_ucs_2_string(scope, tvb, offset, length,
3437 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3438 | break;
3439 |
3440 | case ENC_UCS_40x00000008:
3441 | strptr = (uint8_t*)tvb_get_ucs_4_string(scope, tvb, offset, length,
3442 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3443 | break;
3444 |
3445 | case ENC_ISO_8859_10x0000000A:
3446 | /*
3447 | * ISO 8859-1 printable code point values are equal
3448 | * to the equivalent Unicode code point value, so
3449 | * no translation table is needed.
3450 | */
3451 | strptr = tvb_get_string_8859_1(scope, tvb, offset, length);
3452 | break;
3453 |
3454 | case ENC_ISO_8859_20x0000000C:
3455 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_2);
3456 | break;
3457 |
3458 | case ENC_ISO_8859_30x0000000E:
3459 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_3);
3460 | break;
3461 |
3462 | case ENC_ISO_8859_40x00000010:
3463 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_4);
3464 | break;
3465 |
3466 | case ENC_ISO_8859_50x00000012:
3467 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_5);
3468 | break;
3469 |
3470 | case ENC_ISO_8859_60x00000014:
3471 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_6);
3472 | break;
3473 |
3474 | case ENC_ISO_8859_70x00000016:
3475 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_7);
3476 | break;
3477 |
3478 | case ENC_ISO_8859_80x00000018:
3479 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_8);
3480 | break;
3481 |
3482 | case ENC_ISO_8859_90x0000001A:
3483 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_9);
3484 | break;
3485 |
3486 | case ENC_ISO_8859_100x0000001C:
3487 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_10);
3488 | break;
3489 |
3490 | case ENC_ISO_8859_110x0000001E:
3491 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_11);
3492 | break;
3493 |
3494 | case ENC_ISO_8859_130x00000022:
3495 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_13);
3496 | break;
3497 |
3498 | case ENC_ISO_8859_140x00000024:
3499 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_14);
3500 | break;
3501 |
3502 | case ENC_ISO_8859_150x00000026:
3503 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_15);
3504 | break;
3505 |
3506 | case ENC_ISO_8859_160x00000028:
3507 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_iso_8859_16);
3508 | break;
3509 |
3510 | case ENC_WINDOWS_12500x0000002A:
3511 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1250);
3512 | break;
3513 |
3514 | case ENC_WINDOWS_12510x0000003C:
3515 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1251);
3516 | break;
3517 |
3518 | case ENC_WINDOWS_12520x0000003A:
3519 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp1252);
3520 | break;
3521 |
3522 | case ENC_MAC_ROMAN0x00000030:
3523 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_mac_roman);
3524 | break;
3525 |
3526 | case ENC_CP4370x00000032:
3527 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp437);
3528 | break;
3529 |
3530 | case ENC_CP8550x0000003E:
3531 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp855);
3532 | break;
3533 |
3534 | case ENC_CP8660x00000040:
3535 | strptr = tvb_get_string_unichar2(scope, tvb, offset, length, charset_table_cp866);
3536 | break;
3537 |
3538 | case ENC_ISO_646_BASIC0x00000042:
3539 | strptr = tvb_get_iso_646_string(scope, tvb, offset, length, charset_table_iso_646_basic);
3540 | break;
3541 |
3542 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
3543 | {
3544 | unsigned bit_offset = offset << 3;
3545 | unsigned no_of_chars = (length << 3) / 7;
3546 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_packed(scope, tvb, bit_offset, no_of_chars);
3547 | }
3548 | break;
3549 |
3550 | case ENC_ASCII_7BITS0x00000034:
3551 | {
3552 | unsigned bit_offset = offset << 3;
3553 | unsigned no_of_chars = (length << 3) / 7;
3554 | strptr = (uint8_t*)tvb_get_ascii_7bits_string(scope, tvb, bit_offset, no_of_chars);
3555 | }
3556 | break;
3557 |
3558 | case ENC_EBCDIC0x0000002E:
3559 | /*
3560 | * "Common" EBCDIC, covering all characters with the
3561 | * same code point in all Roman-alphabet EBCDIC code
3562 | * pages.
3563 | */
3564 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic);
3565 | break;
3566 |
3567 | case ENC_EBCDIC_CP0370x00000038:
3568 | /*
3569 | * EBCDIC code page 037.
3570 | */
3571 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp037);
3572 | break;
3573 |
3574 | case ENC_EBCDIC_CP5000x00000060:
3575 | /*
3576 | * EBCDIC code page 500.
3577 | */
3578 | strptr = tvb_get_nonascii_unichar2_string(scope, tvb, offset, length, charset_table_ebcdic_cp500);
3579 | break;
3580 |
3581 | case ENC_T610x00000036:
3582 | strptr = tvb_get_t61_string(scope, tvb, offset, length);
3583 | break;
3584 |
3585 | case ENC_BCD_DIGITS_0_90x00000044:
3586 | /*
3587 | * Packed BCD, with digits 0-9.
3588 | */
3589 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3590 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3591 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt0_9_bcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3592 | break;
3593 |
3594 | case ENC_KEYPAD_ABC_TBCD0x00000046:
3595 | /*
3596 | * Keypad-with-a/b/c "telephony BCD" - packed BCD, with
3597 | * digits 0-9 and symbols *, #, a, b, and c.
3598 | */
3599 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3600 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3601 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_keypad_abc_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3602 | break;
3603 |
3604 | case ENC_KEYPAD_BC_TBCD0x00000048:
3605 | /*
3606 | * Keypad-with-B/C "telephony BCD" - packed BCD, with
3607 | * digits 0-9 and symbols B, C, *, and #.
3608 | */
3609 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3610 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3611 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_ansi_tbcd, skip_first, odd, !(encoding & ENC_LITTLE_ENDIAN0x80000000));
3612 | break;
3613 |
3614 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
3615 | strptr = (uint8_t*)tvb_get_ts_23_038_7bits_string_unpacked(scope, tvb, offset, length);
3616 | break;
3617 |
3618 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
3619 | strptr = (uint8_t*)tvb_get_etsi_ts_102_221_annex_a_string(scope, tvb, offset, length);
3620 | break;
3621 |
3622 | case ENC_GB180300x00000050:
3623 | strptr = tvb_get_gb18030_string(scope, tvb, offset, length);
3624 | break;
3625 |
3626 | case ENC_EUC_KR0x00000052:
3627 | strptr = tvb_get_euc_kr_string(scope, tvb, offset, length);
3628 | break;
3629 |
3630 | case ENC_APN_STR0x00000054:
3631 | strptr = tvb_get_apn_string(scope, tvb, offset, length);
3632 | break;
3633 |
3634 | case ENC_DECT_STANDARD_8BITS0x00000056:
3635 | strptr = tvb_get_dect_standard_8bits_string(scope, tvb, offset, length);
3636 | break;
3637 |
3638 | case ENC_DECT_STANDARD_4BITS_TBCD0x00000058:
3639 | /*
3640 | * DECT standard 4bits "telephony BCD" - packed BCD, with
3641 | * digits 0-9 and symbol SPACE for 0xb.
3642 | */
3643 | odd = (encoding & ENC_BCD_ODD_NUM_DIG0x00010000) >> 16;
3644 | skip_first = (encoding & ENC_BCD_SKIP_FIRST0x00020000) >> 17;
3645 | strptr = (uint8_t*)tvb_get_bcd_string(scope, tvb, offset, length, &Dgt_dect_standard_4bits_tbcd, skip_first, odd, false0);
3646 | break;
3647 | }
3648 | return strptr;
3649 | }
3650 |
3651 | /*
3652 | * This is like tvb_get_string_enc(), except that it handles null-padded
3653 | * strings.
3654 | *
3655 | * Currently, string values are stored as UTF-8 null-terminated strings,
3656 | * so nothing needs to be done differently for null-padded strings; we
3657 | * could save a little memory by not storing the null padding.
3658 | *
3659 | * If we ever store string values differently, in a fashion that doesn't
3660 | * involve null termination, that might change.
3661 | */
3662 | uint8_t *
3663 | tvb_get_stringzpad(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset,
3664 | const unsigned length, const unsigned encoding)
3665 | {
3666 | return tvb_get_string_enc(scope, tvb, offset, length, encoding);
3667 | }
3668 |
3669 | /*
3670 | * These routines are like the above routines, except that they handle
3671 | * null-terminated strings. They find the length of that string (and
3672 | * throw an exception if the tvbuff ends before we find the null), and
3673 | * also return through a pointer the length of the string, in bytes,
3674 | * including the terminating null (the terminating null being 2 bytes
3675 | * for UCS-2 and UTF-16, 4 bytes for UCS-4, and 1 byte for other
3676 | * encodings).
3677 | */
3678 | static uint8_t *
3679 | tvb_get_ascii_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3680 | {
3681 | unsigned size;
3682 | const uint8_t *ptr;
3683 |
3684 | size = tvb_strsize(tvb, offset);
3685 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3686 | if (lengthp)
3687 | *lengthp = size;
3688 | return get_ascii_string(scope, ptr, size);
3689 | }
3690 |
3691 | static uint8_t *
3692 | tvb_get_iso_646_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[0x80])
3693 | {
3694 | unsigned size;
3695 | const uint8_t *ptr;
3696 |
3697 | size = tvb_strsize(tvb, offset);
3698 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3699 | if (lengthp)
3700 | *lengthp = size;
3701 | return get_iso_646_string(scope, ptr, size, table);
3702 | }
3703 |
3704 | static uint8_t *
3705 | tvb_get_utf_8_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3706 | {
3707 | unsigned size;
3708 | const uint8_t *ptr;
3709 |
3710 | size = tvb_strsize(tvb, offset);
3711 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3712 | if (lengthp)
3713 | *lengthp = size;
3714 | return get_utf_8_string(scope, ptr, size);
3715 | }
3716 |
3717 | static uint8_t *
3718 | tvb_get_stringz_8859_1(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3719 | {
3720 | unsigned size;
3721 | const uint8_t *ptr;
3722 |
3723 | size = tvb_strsize(tvb, offset);
3724 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3725 | if (lengthp)
3726 | *lengthp = size;
3727 | return get_8859_1_string(scope, ptr, size);
3728 | }
3729 |
3730 | static uint8_t *
3731 | tvb_get_stringz_unichar2(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[0x80])
3732 | {
3733 | unsigned size;
3734 | const uint8_t *ptr;
3735 |
3736 | size = tvb_strsize(tvb, offset);
3737 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3738 | if (lengthp)
3739 | *lengthp = size;
3740 | return get_unichar2_string(scope, ptr, size, table);
3741 | }
3742 |
3743 | /*
3744 | * Given a tvbuff and an offset, with the offset assumed to refer to
3745 | * a null-terminated string, find the length of that string (and throw
3746 | * an exception if the tvbuff ends before we find the null), ensure that
3747 | * the TVB is flat, and return a pointer to the string (in the TVB).
3748 | * Also return the length of the string (including the terminating null)
3749 | * through a pointer.
3750 | *
3751 | * As long as we aren't using composite TVBs, this saves the cycles used
3752 | * (often unnecessarily) in allocating a buffer and copying the string into
3753 | * it. OTOH, the string returned isn't valid UTF-8, so it shouldn't be
3754 | * added to the tree, the columns, etc., just used with various other
3755 | * functions that operate on strings that don't have a tvb_ equivalent.
3756 | * That's hard to enforce, which is why this is deprecated.
3757 | */
3758 | const uint8_t *
3759 | tvb_get_const_stringz(tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3760 | {
3761 | unsigned size;
3762 | const uint8_t *strptr;
3763 |
3764 | size = tvb_strsize(tvb, offset);
3765 | strptr = ensure_contiguous_unsigned(tvb, offset, size);
3766 | if (lengthp)
3767 | *lengthp = size;
3768 | return strptr;
3769 | }
3770 |
3771 | static char *
3772 | tvb_get_ucs_2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
3773 | {
3774 | unsigned size; /* Number of bytes in string */
3775 | const uint8_t *ptr;
3776 |
3777 | size = tvb_unicode_strsize(tvb, offset);
3778 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3779 | if (lengthp)
3780 | *lengthp = size;
3781 | return (char*)get_ucs_2_string(scope, ptr, size, encoding);
3782 | }
3783 |
3784 | static char *
3785 | tvb_get_utf_16_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
3786 | {
3787 | unsigned size;
3788 | const uint8_t *ptr;
3789 |
3790 | size = tvb_unicode_strsize(tvb, offset);
3791 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3792 | if (lengthp)
3793 | *lengthp = size;
3794 | return (char*)get_utf_16_string(scope, ptr, size, encoding);
3795 | }
3796 |
3797 | static char *
3798 | tvb_get_ucs_4_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
3799 | {
3800 | unsigned end_offset, size;
3801 | gunichar uchar;
3802 | const uint8_t *ptr;
3803 |
3804 | end_offset = offset;
3805 | do {
3806 | /* Endianness doesn't matter when looking for null */
3807 | uchar = tvb_get_ntohl(tvb, end_offset);
3808 | /* Make sure we don't overflow */
3809 | if (ckd_add(&end_offset, end_offset, 4)__builtin_add_overflow((end_offset), (4), (&end_offset))) {
3810 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
3811 | }
3812 | } while(uchar != 0);
3813 | size = end_offset - offset;
3814 |
3815 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3816 | if (lengthp)
3817 | *lengthp = size;
3818 | return (char*)get_ucs_4_string(scope, ptr, size, encoding);
3819 | }
3820 |
3821 | static uint8_t *
3822 | tvb_get_nonascii_unichar2_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const gunichar2 table[256])
3823 | {
3824 | unsigned size;
3825 | const uint8_t *ptr;
3826 |
3827 | size = tvb_strsize(tvb, offset);
3828 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3829 | if (lengthp)
3830 | *lengthp = size;
3831 | return get_nonascii_unichar2_string(scope, ptr, size, table);
3832 | }
3833 |
3834 | static uint8_t *
3835 | tvb_get_t61_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3836 | {
3837 | unsigned size;
3838 | const uint8_t *ptr;
3839 |
3840 | size = tvb_strsize(tvb, offset);
3841 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3842 | if (lengthp)
3843 | *lengthp = size;
3844 | return get_t61_string(scope, ptr, size);
3845 | }
3846 |
3847 | static uint8_t *
3848 | tvb_get_gb18030_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3849 | {
3850 | unsigned size;
3851 | const uint8_t *ptr;
3852 |
3853 | size = tvb_strsize(tvb, offset);
3854 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3855 | if (lengthp)
3856 | *lengthp = size;
3857 | return get_gb18030_string(scope, ptr, size);
3858 | }
3859 |
3860 | static uint8_t *
3861 | tvb_get_euc_kr_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3862 | {
3863 | unsigned size;
3864 | const uint8_t *ptr;
3865 |
3866 | size = tvb_strsize(tvb, offset);
3867 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3868 | if (lengthp)
3869 | *lengthp = size;
3870 | return get_euc_kr_string(scope, ptr, size);
3871 | }
3872 |
3873 | static uint8_t *
3874 | tvb_get_dect_standard_8bits_stringz(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp)
3875 | {
3876 | unsigned size;
3877 | const uint8_t *ptr;
3878 |
3879 | size = tvb_strsize(tvb, offset);
3880 | ptr = ensure_contiguous_unsigned(tvb, offset, size);
3881 | if (lengthp)
3882 | *lengthp = size;
3883 | return get_dect_standard_8bits_string(scope, ptr, size);
3884 | }
3885 |
3886 | uint8_t *
3887 | tvb_get_stringz_enc(wmem_allocator_t *scope, tvbuff_t *tvb, const unsigned offset, unsigned *lengthp, const unsigned encoding)
3888 | {
3889 | uint8_t *strptr;
3890 |
3891 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 3891, "tvb && tvb->initialized" ))));
3892 |
3893 | switch (encoding & ENC_CHARENCODING_MASK0x0000FFFE) {
3894 |
3895 | case ENC_ASCII0x00000000:
3896 | default:
3897 | /*
3898 | * For now, we treat bogus values as meaning
3899 | * "ASCII" rather than reporting an error,
3900 | * for the benefit of old dissectors written
3901 | * when the last argument to proto_tree_add_item()
3902 | * was a bool for the byte order, not an
3903 | * encoding value, and passed non-zero values
3904 | * other than true to mean "little-endian".
3905 | */
3906 | strptr = tvb_get_ascii_stringz(scope, tvb, offset, lengthp);
3907 | break;
3908 |
3909 | case ENC_UTF_80x00000002:
3910 | strptr = tvb_get_utf_8_stringz(scope, tvb, offset, lengthp);
3911 | break;
3912 |
3913 | case ENC_UTF_160x00000004:
3914 | strptr = (uint8_t*)tvb_get_utf_16_stringz(scope, tvb, offset, lengthp,
3915 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3916 | break;
3917 |
3918 | case ENC_UCS_20x00000006:
3919 | strptr = (uint8_t*)tvb_get_ucs_2_stringz(scope, tvb, offset, lengthp,
3920 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3921 | break;
3922 |
3923 | case ENC_UCS_40x00000008:
3924 | strptr = (uint8_t*)tvb_get_ucs_4_stringz(scope, tvb, offset, lengthp,
3925 | encoding & (ENC_LITTLE_ENDIAN0x80000000|ENC_BOM0x20000000));
3926 | break;
3927 |
3928 | case ENC_ISO_8859_10x0000000A:
3929 | /*
3930 | * ISO 8859-1 printable code point values are equal
3931 | * to the equivalent Unicode code point value, so
3932 | * no translation table is needed.
3933 | */
3934 | strptr = tvb_get_stringz_8859_1(scope, tvb, offset, lengthp);
3935 | break;
3936 |
3937 | case ENC_ISO_8859_20x0000000C:
3938 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_2);
3939 | break;
3940 |
3941 | case ENC_ISO_8859_30x0000000E:
3942 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_3);
3943 | break;
3944 |
3945 | case ENC_ISO_8859_40x00000010:
3946 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_4);
3947 | break;
3948 |
3949 | case ENC_ISO_8859_50x00000012:
3950 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_5);
3951 | break;
3952 |
3953 | case ENC_ISO_8859_60x00000014:
3954 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_6);
3955 | break;
3956 |
3957 | case ENC_ISO_8859_70x00000016:
3958 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_7);
3959 | break;
3960 |
3961 | case ENC_ISO_8859_80x00000018:
3962 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_8);
3963 | break;
3964 |
3965 | case ENC_ISO_8859_90x0000001A:
3966 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_9);
3967 | break;
3968 |
3969 | case ENC_ISO_8859_100x0000001C:
3970 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_10);
3971 | break;
3972 |
3973 | case ENC_ISO_8859_110x0000001E:
3974 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_11);
3975 | break;
3976 |
3977 | case ENC_ISO_8859_130x00000022:
3978 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_13);
3979 | break;
3980 |
3981 | case ENC_ISO_8859_140x00000024:
3982 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_14);
3983 | break;
3984 |
3985 | case ENC_ISO_8859_150x00000026:
3986 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_15);
3987 | break;
3988 |
3989 | case ENC_ISO_8859_160x00000028:
3990 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_iso_8859_16);
3991 | break;
3992 |
3993 | case ENC_WINDOWS_12500x0000002A:
3994 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1250);
3995 | break;
3996 |
3997 | case ENC_WINDOWS_12510x0000003C:
3998 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1251);
3999 | break;
4000 |
4001 | case ENC_WINDOWS_12520x0000003A:
4002 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp1252);
4003 | break;
4004 |
4005 | case ENC_MAC_ROMAN0x00000030:
4006 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_mac_roman);
4007 | break;
4008 |
4009 | case ENC_CP4370x00000032:
4010 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp437);
4011 | break;
4012 |
4013 | case ENC_CP8550x0000003E:
4014 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp855);
4015 | break;
4016 |
4017 | case ENC_CP8660x00000040:
4018 | strptr = tvb_get_stringz_unichar2(scope, tvb, offset, lengthp, charset_table_cp866);
4019 | break;
4020 |
4021 | case ENC_ISO_646_BASIC0x00000042:
4022 | strptr = tvb_get_iso_646_stringz(scope, tvb, offset, lengthp, charset_table_iso_646_basic);
4023 | break;
4024 |
4025 | case ENC_3GPP_TS_23_038_7BITS_PACKED0x0000002C:
4026 | case ENC_3GPP_TS_23_038_7BITS_UNPACKED0x0000004C:
4027 | case ENC_ETSI_TS_102_221_ANNEX_A0x0000004E:
4028 | REPORT_DISSECTOR_BUG("TS 23.038 7bits has no null character and doesn't support null-terminated strings")proto_report_dissector_bug("TS 23.038 7bits has no null character and doesn't support null-terminated strings" );
4029 | break;
4030 |
4031 | case ENC_ASCII_7BITS0x00000034:
4032 | REPORT_DISSECTOR_BUG("tvb_get_stringz_enc function with ENC_ASCII_7BITS not implemented yet")proto_report_dissector_bug("tvb_get_stringz_enc function with ENC_ASCII_7BITS not implemented yet" );
4033 | break;
4034 |
4035 | case ENC_EBCDIC0x0000002E:
4036 | /*
4037 | * "Common" EBCDIC, covering all characters with the
4038 | * same code point in all Roman-alphabet EBCDIC code
4039 | * pages.
4040 | */
4041 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic);
4042 | break;
4043 |
4044 | case ENC_EBCDIC_CP0370x00000038:
4045 | /*
4046 | * EBCDIC code page 037.
4047 | */
4048 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp037);
4049 | break;
4050 |
4051 | case ENC_EBCDIC_CP5000x00000060:
4052 | /*
4053 | * EBCDIC code page 500.
4054 | */
4055 | strptr = tvb_get_nonascii_unichar2_stringz(scope, tvb, offset, lengthp, charset_table_ebcdic_cp500);
4056 | break;
4057 |
4058 | case ENC_T610x00000036:
4059 | strptr = tvb_get_t61_stringz(scope, tvb, offset, lengthp);
4060 | break;
4061 |
4062 | case ENC_GB180300x00000050:
4063 | strptr = tvb_get_gb18030_stringz(scope, tvb, offset, lengthp);
4064 | break;
4065 |
4066 | case ENC_EUC_KR0x00000052:
4067 | strptr = tvb_get_euc_kr_stringz(scope, tvb, offset, lengthp);
4068 | break;
4069 |
4070 | case ENC_DECT_STANDARD_8BITS0x00000056:
4071 | strptr = tvb_get_dect_standard_8bits_stringz(scope, tvb, offset, lengthp);
4072 | break;
4073 | }
4074 |
4075 | return strptr;
4076 | }
4077 |
4078 | /* Looks for a stringz (NUL-terminated string) in tvbuff and copies
4079 | * no more than bufsize number of bytes, including terminating NUL, to buffer.
4080 | * Returns length of string (not including terminating NUL), or -1 if the string was
4081 | * truncated in the buffer due to not having reached the terminating NUL.
4082 | * In this way, it acts like snprintf().
4083 | *
4084 | * bufsize MUST be greater than 0.
4085 | *
4086 | * When processing a packet where the remaining number of bytes is less
4087 | * than bufsize, an exception is not thrown if the end of the packet
4088 | * is reached before the NUL is found. If no NUL is found before reaching
4089 | * the end of the short packet, -1 is still returned, and the string
4090 | * is truncated with a NUL, albeit not at buffer[bufsize - 1], but
4091 | * at the correct spot, terminating the string.
4092 | *
4093 | * *bytes_copied will contain the number of bytes actually copied,
4094 | * including the terminating-NUL.
4095 | */
4096 | static int
4097 | _tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const int offset, const unsigned bufsize, uint8_t* buffer, int *bytes_copied)
4098 | {
4099 | int stringlen;
4100 | unsigned abs_offset = 0;
4101 | int limit;
4102 | unsigned len = 0;
4103 | bool_Bool decreased_max = false0;
4104 |
4105 | /* Only read to end of tvbuff, w/o throwing exception. */
4106 | check_offset_length(tvb, offset, -1, &abs_offset, &len);
4107 |
4108 | /* There must at least be room for the terminating NUL. */
4109 | DISSECTOR_ASSERT(bufsize != 0)((void) ((bufsize != 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4109, "bufsize != 0" ))));
4110 |
4111 | /* If there's no room for anything else, just return the NUL. */
4112 | if (bufsize == 1) {
4113 | buffer[0] = 0;
4114 | *bytes_copied = 1;
4115 | return 0;
4116 | }
4117 |
4118 | /* check_offset_length() won't throw an exception if we're
4119 | * looking at the byte immediately after the end of the tvbuff. */
4120 | if (len == 0) {
4121 | THROW(ReportedBoundsError)except_throw(1, (3), ((void*)0));
4122 | }
4123 |
4124 | /*
4125 | * If we've been passed a negative number, bufsize will
4126 | * be huge.
4127 | */
4128 | DISSECTOR_ASSERT(bufsize <= INT_MAX)((void) ((bufsize <= 2147483647) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4128, "bufsize <= 2147483647" ))));
4129 |
4130 | if ((unsigned)len < bufsize) {
4131 | limit = len;
4132 | decreased_max = true1;
4133 | }
4134 | else {
4135 | limit = bufsize;
4136 | }
4137 |
4138 | stringlen = tvb_strnlen(tvb, abs_offset, limit - 1);
4139 | /* If NUL wasn't found, copy the data and return -1 */
4140 | if (stringlen == -1) {
4141 | tvb_memcpy(tvb, buffer, abs_offset, limit);
4142 | if (decreased_max) {
4143 | buffer[limit] = 0;
4144 | /* Add 1 for the extra NUL that we set at buffer[limit],
4145 | * pretending that it was copied as part of the string. */
4146 | *bytes_copied = limit + 1;
4147 | }
4148 | else {
4149 | *bytes_copied = limit;
4150 | }
4151 | return -1;
4152 | }
4153 |
4154 | /* Copy the string to buffer */
4155 | tvb_memcpy(tvb, buffer, abs_offset, stringlen + 1);
4156 | *bytes_copied = stringlen + 1;
4157 | return stringlen;
4158 | }
4159 |
4160 | int
4161 | tvb_get_raw_bytes_as_stringz(tvbuff_t *tvb, const int offset, const unsigned bufsize, uint8_t* buffer)
4162 | {
4163 | int len, bytes_copied;
4164 |
4165 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4165, "tvb && tvb->initialized" ))));
4166 |
4167 | len = _tvb_get_raw_bytes_as_stringz(tvb, offset, bufsize, buffer, &bytes_copied);
4168 |
4169 | if (len == -1) {
4170 | buffer[bufsize - 1] = 0;
4171 | return bytes_copied - 1;
4172 | }
4173 | else {
4174 | return len;
4175 | }
4176 | }
4177 |
4178 | /*
4179 | * Given a tvbuff, an offset into the tvbuff, a buffer, and a buffer size,
4180 | * extract as many raw bytes from the tvbuff, starting at the offset,
4181 | * as 1) are available in the tvbuff and 2) will fit in the buffer, leaving
4182 | * room for a terminating NUL.
4183 | */
4184 | unsigned
4185 | tvb_get_raw_bytes_as_string(tvbuff_t *tvb, const unsigned offset, char *buffer, size_t bufsize)
4186 | {
4187 | unsigned len = 0;
4188 |
4189 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4189, "tvb && tvb->initialized" ))));
4190 |
4191 | /* There must be room for the string and the terminating NUL. */
4192 | DISSECTOR_ASSERT(bufsize > 0)((void) ((bufsize > 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4192, "bufsize > 0" ))));
4193 |
4194 | /* bufsize is size_t, but tvbuffers only have up to unsigned bytes */
4195 | DISSECTOR_ASSERT(bufsize - 1 < UINT_MAX)((void) ((bufsize - 1 < (2147483647 *2U +1U)) ? (void)0 : ( proto_report_dissector_bug("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c" , 4195, "bufsize - 1 < (2147483647 *2U +1U)"))));
4196 |
4197 | len = _tvb_captured_length_remaining(tvb, offset);
4198 | if (len == 0) {
4199 | buffer[0] = '\0';
4200 | return 0;
4201 | }
4202 | if (len > (bufsize - 1))
4203 | len = (unsigned)(bufsize - 1);
4204 |
4205 | /* Copy the string to buffer */
4206 | tvb_memcpy(tvb, buffer, offset, len);
4207 | buffer[len] = '\0';
4208 | return len;
4209 | }
4210 |
4211 | bool_Bool
4212 | tvb_ascii_isprint(tvbuff_t *tvb, const int offset, const int length)
4213 | {
4214 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length);
4215 | unsigned abs_offset, abs_length = length;
4216 |
4217 | if (length == -1) {
4218 | /* tvb_get_ptr has already checked for exceptions. */
4219 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length);
4220 | }
4221 | for (unsigned i = 0; i < abs_length; i++, buf++)
4222 | if (!g_ascii_isprint(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_PRINT) != 0))
4223 | return false0;
4224 |
4225 | return true1;
4226 | }
4227 |
4228 | bool_Bool
4229 | tvb_utf_8_isprint(tvbuff_t *tvb, const int offset, const int length)
4230 | {
4231 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length);
4232 | unsigned abs_offset, abs_length = length;
4233 |
4234 | if (length == -1) {
4235 | /* tvb_get_ptr has already checked for exceptions. */
4236 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length);
4237 | }
4238 |
4239 | return isprint_utf8_string((const char*)buf, abs_length);
4240 | }
4241 |
4242 | bool_Bool
4243 | tvb_ascii_isdigit(tvbuff_t *tvb, const int offset, const int length)
4244 | {
4245 | const uint8_t* buf = tvb_get_ptr(tvb, offset, length);
4246 | unsigned abs_offset, abs_length = length;
4247 |
4248 | if (length == -1) {
4249 | /* tvb_get_ptr has already checked for exceptions. */
4250 | compute_offset_and_remaining(tvb, offset, &abs_offset, &abs_length);
4251 | }
4252 | for (unsigned i = 0; i < abs_length; i++, buf++)
4253 | if (!g_ascii_isdigit(*buf)((g_ascii_table[(guchar) (*buf)] & G_ASCII_DIGIT) != 0))
4254 | return false0;
4255 |
4256 | return true1;
4257 | }
4258 |
4259 | static ws_mempbrk_pattern pbrk_crlf;
4260 | /*
4261 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4262 | * at that offset (which may be -1 for "all the way to the end of the
4263 | * tvbuff"), find the end of the (putative) line that starts at the
4264 | * specified offset in the tvbuff, going no further than the specified
4265 | * length.
4266 | *
4267 | * Return the length of the line (not counting the line terminator at
4268 | * the end), or, if we don't find a line terminator:
4269 | *
4270 | * if "desegment" is true, return -1;
4271 | *
4272 | * if "desegment" is false, return the amount of data remaining in
4273 | * the buffer.
4274 | *
4275 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4276 | * character past the line terminator, or past the end of the buffer if
4277 | * we don't find a line terminator. (It's not set if we return -1.)
4278 | */
4279 | int
4280 | tvb_find_line_end(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset, const bool_Bool desegment)
4281 | {
4282 | int eob_offset;
4283 | int eol_offset;
4284 | int linelen;
4285 | unsigned char found_needle = 0;
4286 | static bool_Bool compiled = false0;
4287 |
4288 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4288, "tvb && tvb->initialized" ))));
4289 |
4290 | if (len == -1) {
4291 | len = _tvb_captured_length_remaining(tvb, offset);
4292 | /* if offset is past the end of the tvbuff, len is now 0 */
4293 | }
4294 |
4295 | eob_offset = offset + len;
4296 |
4297 | if (!compiled) {
4298 | ws_mempbrk_compile(&pbrk_crlf, "\r\n");
4299 | compiled = true1;
4300 | }
4301 |
4302 | /*
4303 | * Look either for a CR or an LF.
4304 | */
4305 | eol_offset = tvb_ws_mempbrk_pattern_uint8(tvb, offset, len, &pbrk_crlf, &found_needle);
4306 | if (eol_offset == -1) {
4307 | /*
4308 | * No CR or LF - line is presumably continued in next packet.
4309 | */
4310 | if (desegment) {
4311 | /*
4312 | * Tell our caller we saw no EOL, so they can
4313 | * try to desegment and get the entire line
4314 | * into one tvbuff.
4315 | */
4316 | return -1;
4317 | } else {
4318 | /*
4319 | * Pretend the line runs to the end of the tvbuff.
4320 | */
4321 | linelen = eob_offset - offset;
4322 | if (next_offset)
4323 | *next_offset = eob_offset;
4324 | }
4325 | } else {
4326 | /*
4327 | * Find the number of bytes between the starting offset
4328 | * and the CR or LF.
4329 | */
4330 | linelen = eol_offset - offset;
4331 |
4332 | /*
4333 | * Is it a CR?
4334 | */
4335 | if (found_needle == '\r') {
4336 | /*
4337 | * Yes - is it followed by an LF?
4338 | */
4339 | if (eol_offset + 1 >= eob_offset) {
4340 | /*
4341 | * Dunno - the next byte isn't in this
4342 | * tvbuff.
4343 | */
4344 | if (desegment) {
4345 | /*
4346 | * We'll return -1, although that
4347 | * runs the risk that if the line
4348 | * really *is* terminated with a CR,
4349 | * we won't properly dissect this
4350 | * tvbuff.
4351 | *
4352 | * It's probably more likely that
4353 | * the line ends with CR-LF than
4354 | * that it ends with CR by itself.
4355 | */
4356 | return -1;
4357 | }
4358 | } else {
4359 | /*
4360 | * Well, we can at least look at the next
4361 | * byte.
4362 | */
4363 | if (tvb_get_uint8(tvb, eol_offset + 1) == '\n') {
4364 | /*
4365 | * It's an LF; skip over the CR.
4366 | */
4367 | eol_offset++;
4368 | }
4369 | }
4370 | }
4371 |
4372 | /*
4373 | * Return the offset of the character after the last
4374 | * character in the line, skipping over the last character
4375 | * in the line terminator.
4376 | */
4377 | if (next_offset)
4378 | *next_offset = eol_offset + 1;
4379 | }
4380 | return linelen;
4381 | }
4382 |
4383 | static ws_mempbrk_pattern pbrk_crlf_dquote;
4384 | /*
4385 | * Given a tvbuff, an offset into the tvbuff, and a length that starts
4386 | * at that offset (which may be -1 for "all the way to the end of the
4387 | * tvbuff"), find the end of the (putative) line that starts at the
4388 | * specified offset in the tvbuff, going no further than the specified
4389 | * length.
4390 | *
4391 | * However, treat quoted strings inside the buffer specially - don't
4392 | * treat newlines in quoted strings as line terminators.
4393 | *
4394 | * Return the length of the line (not counting the line terminator at
4395 | * the end), or the amount of data remaining in the buffer if we don't
4396 | * find a line terminator.
4397 | *
4398 | * If "next_offset" is not NULL, set "*next_offset" to the offset of the
4399 | * character past the line terminator, or past the end of the buffer if
4400 | * we don't find a line terminator.
4401 | */
4402 | int
4403 | tvb_find_line_end_unquoted(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset)
4404 | {
4405 | int cur_offset, char_offset;
4406 | bool_Bool is_quoted;
4407 | unsigned char c = 0;
4408 | int eob_offset;
4409 | int linelen;
4410 | static bool_Bool compiled = false0;
4411 |
4412 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4412, "tvb && tvb->initialized" ))));
4413 |
4414 | if (len == -1)
4415 | len = _tvb_captured_length_remaining(tvb, offset);
4416 |
4417 | if (!compiled) {
4418 | ws_mempbrk_compile(&pbrk_crlf_dquote, "\r\n\"");
4419 | compiled = true1;
4420 | }
4421 |
4422 | eob_offset = offset + len;
4423 |
4424 | cur_offset = offset;
4425 | is_quoted = false0;
4426 | for (;;) {
4427 | /*
4428 | * Is this part of the string quoted?
4429 | */
4430 | if (is_quoted) {
4431 | /*
4432 | * Yes - look only for the terminating quote.
4433 | */
4434 | char_offset = tvb_find_uint8(tvb, cur_offset, len,
4435 | '"');
4436 | } else {
4437 | /*
4438 | * Look either for a CR, an LF, or a '"'.
4439 | */
4440 | char_offset = tvb_ws_mempbrk_pattern_uint8(tvb, cur_offset, len, &pbrk_crlf_dquote, &c);
4441 | }
4442 | if (char_offset == -1) {
4443 | /*
4444 | * Not found - line is presumably continued in
4445 | * next packet.
4446 | * We pretend the line runs to the end of the tvbuff.
4447 | */
4448 | linelen = eob_offset - offset;
4449 | if (next_offset)
4450 | *next_offset = eob_offset;
4451 | break;
4452 | }
4453 |
4454 | if (is_quoted) {
4455 | /*
4456 | * We're processing a quoted string.
4457 | * We only looked for ", so we know it's a ";
4458 | * as we're processing a quoted string, it's a
4459 | * closing quote.
4460 | */
4461 | is_quoted = false0;
4462 | } else {
4463 | /*
4464 | * OK, what is it?
4465 | */
4466 | if (c == '"') {
4467 | /*
4468 | * Un-quoted "; it begins a quoted
4469 | * string.
4470 | */
4471 | is_quoted = true1;
4472 | } else {
4473 | /*
4474 | * It's a CR or LF; we've found a line
4475 | * terminator.
4476 | *
4477 | * Find the number of bytes between the
4478 | * starting offset and the CR or LF.
4479 | */
4480 | linelen = char_offset - offset;
4481 |
4482 | /*
4483 | * Is it a CR?
4484 | */
4485 | if (c == '\r') {
4486 | /*
4487 | * Yes; is it followed by an LF?
4488 | */
4489 | if (char_offset + 1 < eob_offset &&
4490 | tvb_get_uint8(tvb, char_offset + 1)
4491 | == '\n') {
4492 | /*
4493 | * Yes; skip over the CR.
4494 | */
4495 | char_offset++;
4496 | }
4497 | }
4498 |
4499 | /*
4500 | * Return the offset of the character after
4501 | * the last character in the line, skipping
4502 | * over the last character in the line
4503 | * terminator, and quit.
4504 | */
4505 | if (next_offset)
4506 | *next_offset = char_offset + 1;
4507 | break;
4508 | }
4509 | }
4510 |
4511 | /*
4512 | * Step past the character we found.
4513 | */
4514 | cur_offset = char_offset + 1;
4515 | if (cur_offset >= eob_offset) {
4516 | /*
4517 | * The character we found was the last character
4518 | * in the tvbuff - line is presumably continued in
4519 | * next packet.
4520 | * We pretend the line runs to the end of the tvbuff.
4521 | */
4522 | linelen = eob_offset - offset;
4523 | if (next_offset)
4524 | *next_offset = eob_offset;
4525 | break;
4526 | }
4527 | }
4528 | return linelen;
4529 | }
4530 |
4531 | /*
4532 | * Copied from the mgcp dissector. (This function should be moved to /epan )
4533 | * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
4534 | * character following offset or offset + maxlength -1 whichever
4535 | * is smaller.
4536 | *
4537 | * Parameters:
4538 | * tvb - The tvbuff in which we are skipping whitespace.
4539 | * offset - The offset in tvb from which we begin trying to skip whitespace.
4540 | * maxlength - The maximum distance from offset that we may try to skip
4541 | * whitespace.
4542 | *
4543 | * Returns: The position in tvb of the first non-whitespace
4544 | * character following offset or offset + maxlength -1 whichever
4545 | * is smaller.
4546 | */
4547 | int
4548 | tvb_skip_wsp(tvbuff_t *tvb, const int offset, const int maxlength)
4549 | {
4550 | int counter;
4551 | int end, tvb_len;
4552 | uint8_t tempchar;
4553 |
4554 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4554, "tvb && tvb->initialized" ))));
4555 |
4556 | /* Get the length remaining */
4557 | /*tvb_len = tvb_captured_length(tvb);*/
4558 | tvb_len = tvb->length;
4559 |
4560 | end = offset + maxlength;
4561 | if (end >= tvb_len)
4562 | {
4563 | end = tvb_len;
4564 | }
4565 |
4566 | /* Skip past spaces, tabs, CRs and LFs until run out or meet something else */
4567 | for (counter = offset;
4568 | counter < end &&
4569 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
4570 | tempchar == '\t' || tempchar == '\r' || tempchar == '\n');
4571 | counter++);
4572 |
4573 | return (counter);
4574 | }
4575 |
4576 | int
4577 | tvb_skip_wsp_return(tvbuff_t *tvb, const int offset)
4578 | {
4579 | int counter;
4580 | uint8_t tempchar;
4581 |
4582 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4582, "tvb && tvb->initialized" ))));
4583 |
4584 | for (counter = offset; counter > 0 &&
4585 | ((tempchar = tvb_get_uint8(tvb,counter)) == ' ' ||
4586 | tempchar == '\t' || tempchar == '\n' || tempchar == '\r'); counter--);
4587 | counter++;
4588 |
4589 | return (counter);
4590 | }
4591 |
4592 | int
4593 | tvb_skip_uint8(tvbuff_t *tvb, int offset, const int maxlength, const uint8_t ch)
4594 | {
4595 | int end, tvb_len;
4596 |
4597 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4597, "tvb && tvb->initialized" ))));
4598 |
4599 | /* Get the length remaining */
4600 | /*tvb_len = tvb_captured_length(tvb);*/
4601 | tvb_len = tvb->length;
4602 |
4603 | end = offset + maxlength;
4604 | if (end >= tvb_len)
4605 | end = tvb_len;
4606 |
4607 | while (offset < end) {
4608 | uint8_t tempch = tvb_get_uint8(tvb, offset);
4609 |
4610 | if (tempch != ch)
4611 | break;
4612 | offset++;
4613 | }
4614 |
4615 | return offset;
4616 | }
4617 |
4618 | static ws_mempbrk_pattern pbrk_whitespace;
4619 |
4620 | int tvb_get_token_len(tvbuff_t *tvb, const unsigned offset, int len, int *next_offset, const bool_Bool desegment)
4621 | {
4622 | int eob_offset;
4623 | int eot_offset;
4624 | int tokenlen;
4625 | unsigned char found_needle = 0;
4626 | static bool_Bool compiled = false0;
4627 |
4628 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4628, "tvb && tvb->initialized" ))));
4629 |
4630 | if (len == -1) {
4631 | len = _tvb_captured_length_remaining(tvb, offset);
4632 | /* if offset is past the end of the tvbuff, len is now 0 */
4633 | }
4634 |
4635 | eob_offset = offset + len;
4636 |
4637 | if (!compiled) {
4638 | ws_mempbrk_compile(&pbrk_whitespace, " \r\n");
4639 | compiled = true1;
4640 | }
4641 |
4642 | /*
4643 | * Look either for a space, CR, or LF.
4644 | */
4645 | eot_offset = tvb_ws_mempbrk_pattern_uint8(tvb, offset, len, &pbrk_whitespace, &found_needle);
4646 | if (eot_offset == -1) {
4647 | /*
4648 | * No space, CR or LF - token is presumably continued in next packet.
4649 | */
4650 | if (desegment) {
4651 | /*
4652 | * Tell our caller we saw no whitespace, so they can
4653 | * try to desegment and get the entire line
4654 | * into one tvbuff.
4655 | */
4656 | return -1;
4657 | }
4658 | else {
4659 | /*
4660 | * Pretend the token runs to the end of the tvbuff.
4661 | */
4662 | tokenlen = eob_offset - offset;
4663 | if (next_offset)
4664 | *next_offset = eob_offset;
4665 | }
4666 | }
4667 | else {
4668 | /*
4669 | * Find the number of bytes between the starting offset
4670 | * and the space, CR or LF.
4671 | */
4672 | tokenlen = eot_offset - offset;
4673 |
4674 | /*
4675 | * Return the offset of the character after the last
4676 | * character in the line, skipping over the last character
4677 | * in the line terminator.
4678 | */
4679 | if (next_offset)
4680 | *next_offset = eot_offset + 1;
4681 | }
4682 | return tokenlen;
4683 | }
4684 |
4685 | /*
4686 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
4687 | * to the string with the formatted data, with "punct" as a byte
4688 | * separator.
4689 | */
4690 | char *
4691 | tvb_bytes_to_str_punct(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const char punct)
4692 | {
4693 | DISSECTOR_ASSERT(len >= 0)((void) ((len >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4693, "len >= 0" ))));
4694 | return bytes_to_str_punct(scope, ensure_contiguous(tvb, offset, len), len, punct)bytes_to_str_punct_maxlen(scope, ensure_contiguous(tvb, offset , len), len, punct, 24);
4695 | }
4696 |
4697 | /*
4698 | * Given a wmem scope, a tvbuff, an offset, a length, an input digit
4699 | * set, and a boolean indicator, fetch BCD-encoded digits from a
4700 | * tvbuff starting from either the low or high half byte of the
4701 | * first byte depending on the boolean indicator (true means "start
4702 | * with the high half byte, ignoring the low half byte", and false
4703 | * means "start with the low half byte and proceed to the high half
4704 | * byte), formating the digits into characters according to the
4705 | * input digit set, and return a pointer to a UTF-8 string, allocated
4706 | * using the wmem scope. A nibble of 0xf is considered a 'filler'
4707 | * and will end the conversion. Similarly if odd is set the last
4708 | * high nibble will be omitted. (Note that if both skip_first and
4709 | * odd are true, then both the first and last semi-octet are skipped,
4710 | * i.e. an even number of nibbles are considered.)
4711 | */
4712 | char *
4713 | tvb_get_bcd_string(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, int len, const dgt_set_t *dgt, bool_Bool skip_first, bool_Bool odd, bool_Bool bigendian)
4714 | {
4715 | const uint8_t *ptr;
4716 | int i = 0;
4717 | char *digit_str;
4718 | uint8_t octet, nibble;
4719 |
4720 | DISSECTOR_ASSERT(tvb && tvb->initialized)((void) ((tvb && tvb->initialized) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4720, "tvb && tvb->initialized" ))));
4721 |
4722 | if (len == -1) {
4723 | /*
4724 | * Run to the end of the captured data.
4725 | *
4726 | * XXX - captured, or total?
4727 | */
4728 | /*length = tvb_captured_length(tvb);*/
4729 | len = tvb->length;
4730 | if (len < offset) {
4731 | return (char *)"";
4732 | }
4733 | len -= offset;
4734 | }
4735 |
4736 | ptr = ensure_contiguous(tvb, offset, len);
4737 |
4738 | /*
4739 | * XXX - map illegal digits (digits that map to 0) to REPLACEMENT
4740 | * CHARACTER, and have all the tables in epan/tvbuff.c use 0 rather
4741 | * than '?'?
4742 | */
4743 | digit_str = (char *)wmem_alloc(scope, len*2 + 1);
4744 |
4745 | while (len > 0) {
4746 | octet = *ptr;
4747 | if (!skip_first) {
4748 | if (bigendian) {
4749 | nibble = (octet >> 4) & 0x0f;
4750 | } else {
4751 | nibble = octet & 0x0f;
4752 | }
4753 | if (nibble == 0x0f) {
4754 | /*
4755 | * Stop digit.
4756 | */
4757 | break;
4758 | }
4759 | digit_str[i] = dgt->out[nibble];
4760 | i++;
4761 | }
4762 | skip_first = false0;
4763 |
4764 | /*
4765 | * unpack second value in byte
4766 | */
4767 | if (bigendian) {
4768 | nibble = octet & 0x0f;
4769 | } else {
4770 | nibble = octet >> 4;
4771 | }
4772 |
4773 | if (nibble == 0x0f) {
4774 | /*
4775 | * This is the stop digit or a filler digit. Ignore
4776 | * it.
4777 | */
4778 | break;
4779 | }
4780 | if ((len == 1) && (odd == true1 )){
4781 | /* Last octet, skip last high nibble in case of odd number of digits */
4782 | break;
4783 | }
4784 | digit_str[i] = dgt->out[nibble];
4785 | i++;
4786 |
4787 | ptr++;
4788 | len--;
4789 | }
4790 | digit_str[i] = '\0';
4791 | return digit_str;
4792 | }
4793 |
4794 | /* XXXX Fix me - needs odd indicator added */
4795 | const char *
4796 | tvb_bcd_dig_to_str(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const dgt_set_t *dgt, bool_Bool skip_first)
4797 | {
4798 | if (!dgt)
4799 | dgt = &Dgt0_9_bcd;
4800 |
4801 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, false0);
4802 | }
4803 |
4804 | const char *
4805 | tvb_bcd_dig_to_str_be(wmem_allocator_t *scope, tvbuff_t *tvb, const int offset, const int len, const dgt_set_t *dgt, bool_Bool skip_first)
4806 | {
4807 | if (!dgt)
4808 | dgt = &Dgt0_9_bcd;
4809 |
4810 | return tvb_get_bcd_string(scope, tvb, offset, len, dgt, skip_first, false0, true1);
4811 | }
4812 |
4813 | /*
4814 | * Format a bunch of data from a tvbuff as bytes, returning a pointer
4815 | * to the string with the formatted data.
4816 | */
4817 | char *tvb_bytes_to_str(wmem_allocator_t *allocator, tvbuff_t *tvb,
4818 | const int offset, const int len)
4819 | {
4820 | DISSECTOR_ASSERT(len >= 0)((void) ((len >= 0) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/tvbuff.c", 4820, "len >= 0" ))));
4821 | return bytes_to_str(allocator, ensure_contiguous(tvb, offset, len), len)bytes_to_str_maxlen(allocator, ensure_contiguous(tvb, offset, len), len, 36);
4822 | }
4823 |
4824 | /* Find a needle tvbuff within a haystack tvbuff. */
4825 | int
4826 | tvb_find_tvb(tvbuff_t *haystack_tvb, tvbuff_t *needle_tvb, const int haystack_offset)
4827 | {
4828 | unsigned haystack_abs_offset = 0, haystack_abs_length = 0;
4829 | const uint8_t *haystack_data;
4830 | const uint8_t *needle_data;
4831 | const unsigned needle_len = needle_tvb->length;
4832 | const uint8_t *location;
4833 |
4834 | DISSECTOR_ASSERT(haystack_tvb && haystack_tvb->initialized)((void) ((haystack_tvb && haystack_tvb->initialized ) ? (void)0 : (proto_report_dissector_bug("%s:%u: failed assertion \"%s\"" , "epan/tvbuff.c", 4834, "haystack_tvb && haystack_tvb->initialized" ))));
4835 |
4836 | if (haystack_tvb->length < 1 || needle_tvb->length < 1) {
4837 | return -1;
4838 | }
4839 |
4840 | /* Get pointers to the tvbuffs' data. */
4841 | haystack_data = ensure_contiguous(haystack_tvb, 0, -1);
4842 | needle_data = ensure_contiguous(needle_tvb, 0, -1);
4843 |
4844 | check_offset_length(haystack_tvb, haystack_offset, -1,
4845 | &haystack_abs_offset, &haystack_abs_length);
4846 |
4847 | location = ws_memmem(haystack_data + haystack_abs_offset, haystack_abs_length,
4848 | needle_data, needle_len);
4849 |
4850 | if (location) {
4851 | return (int) (location - haystack_data);
4852 | }
4853 |
4854 | return -1;
4855 | }
4856 |
4857 | int
4858 | tvb_raw_offset(tvbuff_t *tvb)
4859 | {
4860 | return ((tvb->raw_offset==-1) ? (tvb->raw_offset = tvb_offset_from_real_beginning(tvb)) : tvb->raw_offset);
4861 | }
4862 |
4863 | void
4864 | tvb_set_fragment(tvbuff_t *tvb)
4865 | {
4866 | tvb->flags |= TVBUFF_FRAGMENT0x00000001;
4867 | }
4868 |
4869 | struct tvbuff *
4870 | tvb_get_ds_tvb(tvbuff_t *tvb)
4871 | {
4872 | return(tvb->ds_tvb);
4873 | }
4874 |
4875 | unsigned
4876 | tvb_get_varint(tvbuff_t *tvb, unsigned offset, unsigned maxlen, uint64_t *value, const unsigned encoding)
4877 | {
4878 | *value = 0;
4879 |
4880 | switch (encoding & ENC_VARINT_MASK(0x00000002|0x00000004|0x00000008|0x00000010)) {
4881 | case ENC_VARINT_PROTOBUF0x00000002:
4882 | {
4883 | unsigned i;
4884 | uint64_t b; /* current byte */
4885 |
4886 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
4887 | b = tvb_get_uint8(tvb, offset++);
4888 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
4889 |
4890 | if (b < 0x80) {
4891 | /* end successfully because of last byte's msb(most significant bit) is zero */
4892 | return i + 1;
4893 | }
4894 | }
4895 | break;
4896 | }
4897 |
4898 | case ENC_VARINT_ZIGZAG0x00000008:
4899 | {
4900 | unsigned i;
4901 | uint64_t b; /* current byte */
4902 |
4903 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
4904 | b = tvb_get_uint8(tvb, offset++);
4905 | *value |= ((b & 0x7F) << (i * 7)); /* add lower 7 bits to val */
4906 |
4907 | if (b < 0x80) {
4908 | /* end successfully because of last byte's msb(most significant bit) is zero */
4909 | *value = (*value >> 1) ^ ((*value & 1) ? -1 : 0);
4910 | return i + 1;
4911 | }
4912 | }
4913 | break;
4914 | }
4915 |
4916 | case ENC_VARINT_SDNV0x00000010:
4917 | {
4918 | /* Decodes similar to protobuf but in MSByte order */
4919 | unsigned i;
4920 | uint64_t b; /* current byte */
4921 |
4922 | for (i = 0; ((i < FT_VARINT_MAX_LEN10) && (i < maxlen)); ++i) {
4923 | b = tvb_get_uint8(tvb, offset++);
4924 | if ((i == 9) && (*value >= UINT64_C(1)1UL<<(64-7))) {
4925 | // guaranteed overflow, not valid SDNV
4926 | return 0;
4927 | }
4928 | *value <<= 7;
4929 | *value |= (b & 0x7F); /* add lower 7 bits to val */
4930 |
4931 | if (b < 0x80) {
4932 | /* end successfully because of last byte's msb(most significant bit) is zero */
4933 | return i + 1;
4934 | }
4935 | }
4936 | break;
4937 | }
4938 |
4939 | case ENC_VARINT_QUIC0x00000004:
4940 | {
4941 | /* calculate variable length */
4942 | *value = tvb_get_uint8(tvb, offset);
4943 | switch((*value) >> 6) {
4944 | case 0: /* 0b00 => 1 byte length (6 bits Usable) */
4945 | (*value) &= 0x3F;
4946 | return 1;
4947 | case 1: /* 0b01 => 2 bytes length (14 bits Usable) */
4948 | *value = tvb_get_ntohs(tvb, offset) & 0x3FFF;
4949 | return 2;
4950 | case 2: /* 0b10 => 4 bytes length (30 bits Usable) */
4951 | *value = tvb_get_ntohl(tvb, offset) & 0x3FFFFFFF;
4952 | return 4;
4953 | case 3: /* 0b11 => 8 bytes length (62 bits Usable) */
4954 | *value = tvb_get_ntoh64(tvb, offset) & UINT64_C(0x3FFFFFFFFFFFFFFF)0x3FFFFFFFFFFFFFFFUL;
4955 | return 8;
4956 | default: /* No Possible */
4957 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/tvbuff.c", 4957, __func__, "assertion \"not reached\" failed");
4958 | break;
4959 | }
4960 | break;
4961 | }
4962 |
4963 | default:
4964 | DISSECTOR_ASSERT_NOT_REACHED()(proto_report_dissector_bug("%s:%u: failed assertion \"DISSECTOR_ASSERT_NOT_REACHED\"" , "epan/tvbuff.c", 4964));
4965 | }
4966 |
4967 | return 0; /* 10 bytes scanned, but no bytes' msb is zero */
4968 | }
4969 |
4970 | /*
4971 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
4972 | *
4973 | * Local variables:
4974 | * c-basic-offset: 8
4975 | * tab-width: 8
4976 | * indent-tabs-mode: t
4977 | * End:
4978 | *
4979 | * vi: set shiftwidth=8 tabstop=8 noexpandtab:
4980 | * :indentSize=8:tabSize=8:noTabs=false:
4981 | */