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7e729bb5 MC |
1 | /* ssl/packet_locl.h */ |
2 | /* | |
3 | * Written by Matt Caswell for the OpenSSL project. | |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 2015 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * openssl-core@openssl.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #ifndef HEADER_PACKET_LOCL_H | |
60 | # define HEADER_PACKET_LOCL_H | |
61 | ||
62 | # include <string.h> | |
63 | # include <openssl/bn.h> | |
64 | # include <openssl/buffer.h> | |
31011544 | 65 | # include <openssl/crypto.h> |
80e0ecbf | 66 | # include <openssl/e_os2.h> |
7e729bb5 MC |
67 | |
68 | # ifdef __cplusplus | |
69 | extern "C" { | |
70 | # endif | |
71 | ||
72 | typedef struct { | |
7e729bb5 MC |
73 | /* Pointer to where we are currently reading from */ |
74 | unsigned char *curr; | |
6a12a574 EK |
75 | /* Number of bytes remaining */ |
76 | size_t remaining; | |
7e729bb5 MC |
77 | } PACKET; |
78 | ||
6a12a574 | 79 | /* Internal unchecked shorthand; don't use outside this file. */ |
80e0ecbf | 80 | static ossl_inline void packet_forward(PACKET *pkt, size_t len) |
6a12a574 EK |
81 | { |
82 | pkt->curr += len; | |
83 | pkt->remaining -= len; | |
84 | } | |
85 | ||
7e729bb5 | 86 | /* |
bc6616a4 | 87 | * Returns the number of bytes remaining to be read in the PACKET |
7e729bb5 | 88 | */ |
80e0ecbf | 89 | static ossl_inline size_t PACKET_remaining(const PACKET *pkt) |
7e729bb5 | 90 | { |
6a12a574 | 91 | return pkt->remaining; |
7e729bb5 MC |
92 | } |
93 | ||
ec30e856 EK |
94 | /* |
95 | * Returns a pointer to the PACKET's current position. | |
96 | * For use in non-PACKETized APIs. | |
97 | * TODO(openssl-team): this should return 'const unsigned char*' but can't | |
98 | * currently because legacy code passes 'unsigned char*'s around. | |
99 | */ | |
80e0ecbf | 100 | static ossl_inline unsigned char *PACKET_data(const PACKET *pkt) |
ec30e856 EK |
101 | { |
102 | return pkt->curr; | |
103 | } | |
104 | ||
7e729bb5 MC |
105 | /* |
106 | * Initialise a PACKET with |len| bytes held in |buf|. This does not make a | |
107 | * copy of the data so |buf| must be present for the whole time that the PACKET | |
108 | * is being used. | |
109 | */ | |
80e0ecbf DSH |
110 | __owur static ossl_inline int PACKET_buf_init(PACKET *pkt, unsigned char *buf, |
111 | size_t len) | |
7e729bb5 | 112 | { |
6a12a574 | 113 | /* Sanity check for negative values. */ |
36830eca | 114 | #ifdef SIZE_MAX |
3fde6c92 | 115 | if (len > (size_t)(SIZE_MAX / 2)) |
7e729bb5 | 116 | return 0; |
36830eca RL |
117 | #else |
118 | if (len > ((size_t)2 << (sizeof(size_t) * 8 - 1))) | |
119 | return 0; | |
120 | #endif | |
7e729bb5 | 121 | |
6a12a574 EK |
122 | pkt->curr = buf; |
123 | pkt->remaining = len; | |
7e729bb5 MC |
124 | return 1; |
125 | } | |
126 | ||
b3e2272c | 127 | /* Initialize a PACKET to hold zero bytes. */ |
80e0ecbf | 128 | static ossl_inline void PACKET_null_init(PACKET *pkt) |
b3e2272c EK |
129 | { |
130 | pkt->curr = NULL; | |
131 | pkt->remaining = 0; | |
132 | } | |
133 | ||
31011544 EK |
134 | /* |
135 | * Returns 1 if the packet has length |num| and its contents equal the |num| | |
136 | * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal). | |
137 | * If lengths are equal, performs the comparison in constant time. | |
138 | */ | |
80e0ecbf DSH |
139 | __owur static ossl_inline int PACKET_equal(const PACKET *pkt, const void *ptr, |
140 | size_t num) | |
141 | { | |
31011544 EK |
142 | if (PACKET_remaining(pkt) != num) |
143 | return 0; | |
144 | return CRYPTO_memcmp(pkt->curr, ptr, num) == 0; | |
145 | } | |
146 | ||
7e729bb5 MC |
147 | /* |
148 | * Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|. | |
149 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
150 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
151 | */ | |
80e0ecbf DSH |
152 | __owur static ossl_inline int PACKET_peek_sub_packet(const PACKET *pkt, |
153 | PACKET *subpkt, | |
154 | size_t len) | |
7e729bb5 MC |
155 | { |
156 | if (PACKET_remaining(pkt) < len) | |
157 | return 0; | |
158 | ||
f4f78ff7 | 159 | return PACKET_buf_init(subpkt, pkt->curr, len); |
7e729bb5 MC |
160 | } |
161 | ||
162 | /* | |
163 | * Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not | |
164 | * copied: the |subpkt| packet will share its underlying buffer with the | |
165 | * original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
166 | */ | |
80e0ecbf DSH |
167 | __owur static ossl_inline int PACKET_get_sub_packet(PACKET *pkt, |
168 | PACKET *subpkt, | |
169 | size_t len) | |
7e729bb5 MC |
170 | { |
171 | if (!PACKET_peek_sub_packet(pkt, subpkt, len)) | |
172 | return 0; | |
173 | ||
6a12a574 | 174 | packet_forward(pkt, len); |
7e729bb5 MC |
175 | |
176 | return 1; | |
177 | } | |
178 | ||
80e0ecbf DSH |
179 | /* |
180 | * Peek ahead at 2 bytes in network order from |pkt| and store the value in | |
7e729bb5 MC |
181 | * |*data| |
182 | */ | |
80e0ecbf DSH |
183 | __owur static ossl_inline int PACKET_peek_net_2(const PACKET *pkt, |
184 | unsigned int *data) | |
7e729bb5 MC |
185 | { |
186 | if (PACKET_remaining(pkt) < 2) | |
187 | return 0; | |
188 | ||
80e0ecbf | 189 | *data = ((unsigned int)(*pkt->curr)) << 8; |
7e729bb5 MC |
190 | *data |= *(pkt->curr + 1); |
191 | ||
192 | return 1; | |
193 | } | |
194 | ||
195 | /* Equivalent of n2s */ | |
196 | /* Get 2 bytes in network order from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
197 | __owur static ossl_inline int PACKET_get_net_2(PACKET *pkt, |
198 | unsigned int *data) | |
7e729bb5 MC |
199 | { |
200 | if (!PACKET_peek_net_2(pkt, data)) | |
201 | return 0; | |
202 | ||
6a12a574 | 203 | packet_forward(pkt, 2); |
7e729bb5 MC |
204 | |
205 | return 1; | |
206 | } | |
207 | ||
80e0ecbf DSH |
208 | /* |
209 | * Peek ahead at 3 bytes in network order from |pkt| and store the value in | |
7e729bb5 MC |
210 | * |*data| |
211 | */ | |
80e0ecbf DSH |
212 | __owur static ossl_inline int PACKET_peek_net_3(const PACKET *pkt, |
213 | unsigned long *data) | |
7e729bb5 MC |
214 | { |
215 | if (PACKET_remaining(pkt) < 3) | |
216 | return 0; | |
217 | ||
80e0ecbf DSH |
218 | *data = ((unsigned long)(*pkt->curr)) << 16; |
219 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 8; | |
44128847 | 220 | *data |= *(pkt->curr + 2); |
7e729bb5 MC |
221 | |
222 | return 1; | |
223 | } | |
224 | ||
225 | /* Equivalent of n2l3 */ | |
226 | /* Get 3 bytes in network order from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
227 | __owur static ossl_inline int PACKET_get_net_3(PACKET *pkt, |
228 | unsigned long *data) | |
7e729bb5 MC |
229 | { |
230 | if (!PACKET_peek_net_3(pkt, data)) | |
231 | return 0; | |
232 | ||
6a12a574 | 233 | packet_forward(pkt, 3); |
7e729bb5 MC |
234 | |
235 | return 1; | |
236 | } | |
237 | ||
80e0ecbf DSH |
238 | /* |
239 | * Peek ahead at 4 bytes in network order from |pkt| and store the value in | |
7e729bb5 MC |
240 | * |*data| |
241 | */ | |
80e0ecbf DSH |
242 | __owur static ossl_inline int PACKET_peek_net_4(const PACKET *pkt, |
243 | unsigned long *data) | |
7e729bb5 MC |
244 | { |
245 | if (PACKET_remaining(pkt) < 4) | |
246 | return 0; | |
247 | ||
80e0ecbf | 248 | *data = ((unsigned long)(*pkt->curr)) << 24; |
44128847 | 249 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 16; |
80e0ecbf DSH |
250 | *data |= ((unsigned long)(*(pkt->curr + 2))) << 8; |
251 | *data |= *(pkt->curr + 3); | |
7e729bb5 MC |
252 | |
253 | return 1; | |
254 | } | |
255 | ||
256 | /* Equivalent of n2l */ | |
257 | /* Get 4 bytes in network order from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
258 | __owur static ossl_inline int PACKET_get_net_4(PACKET *pkt, |
259 | unsigned long *data) | |
7e729bb5 MC |
260 | { |
261 | if (!PACKET_peek_net_4(pkt, data)) | |
262 | return 0; | |
263 | ||
6a12a574 | 264 | packet_forward(pkt, 4); |
7e729bb5 MC |
265 | |
266 | return 1; | |
267 | } | |
268 | ||
269 | /* Peek ahead at 1 byte from |pkt| and store the value in |*data| */ | |
80e0ecbf DSH |
270 | __owur static ossl_inline int PACKET_peek_1(const PACKET *pkt, |
271 | unsigned int *data) | |
7e729bb5 MC |
272 | { |
273 | if (!PACKET_remaining(pkt)) | |
274 | return 0; | |
275 | ||
276 | *data = *pkt->curr; | |
277 | ||
278 | return 1; | |
279 | } | |
280 | ||
281 | /* Get 1 byte from |pkt| and store the value in |*data| */ | |
80e0ecbf | 282 | __owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data) |
7e729bb5 MC |
283 | { |
284 | if (!PACKET_peek_1(pkt, data)) | |
285 | return 0; | |
286 | ||
6a12a574 | 287 | packet_forward(pkt, 1); |
7e729bb5 MC |
288 | |
289 | return 1; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Peek ahead at 4 bytes in reverse network order from |pkt| and store the value | |
294 | * in |*data| | |
295 | */ | |
80e0ecbf DSH |
296 | __owur static ossl_inline int PACKET_peek_4(const PACKET *pkt, |
297 | unsigned long *data) | |
7e729bb5 MC |
298 | { |
299 | if (PACKET_remaining(pkt) < 4) | |
300 | return 0; | |
301 | ||
80e0ecbf DSH |
302 | *data = *pkt->curr; |
303 | *data |= ((unsigned long)(*(pkt->curr + 1))) << 8; | |
44128847 MC |
304 | *data |= ((unsigned long)(*(pkt->curr + 2))) << 16; |
305 | *data |= ((unsigned long)(*(pkt->curr + 3))) << 24; | |
7e729bb5 MC |
306 | |
307 | return 1; | |
308 | } | |
309 | ||
310 | /* Equivalent of c2l */ | |
311 | /* | |
312 | * Get 4 bytes in reverse network order from |pkt| and store the value in | |
313 | * |*data| | |
314 | */ | |
80e0ecbf | 315 | __owur static ossl_inline int PACKET_get_4(PACKET *pkt, unsigned long *data) |
7e729bb5 MC |
316 | { |
317 | if (!PACKET_peek_4(pkt, data)) | |
318 | return 0; | |
319 | ||
6a12a574 | 320 | packet_forward(pkt, 4); |
7e729bb5 MC |
321 | |
322 | return 1; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in | |
327 | * |*data|. This just points at the underlying buffer that |pkt| is using. The | |
328 | * caller should not free this data directly (it will be freed when the | |
329 | * underlying buffer gets freed | |
330 | */ | |
80e0ecbf DSH |
331 | __owur static ossl_inline int PACKET_peek_bytes(const PACKET *pkt, |
332 | unsigned char **data, | |
333 | size_t len) | |
7e729bb5 MC |
334 | { |
335 | if (PACKET_remaining(pkt) < len) | |
336 | return 0; | |
337 | ||
338 | *data = pkt->curr; | |
339 | ||
340 | return 1; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This | |
345 | * just points at the underlying buffer that |pkt| is using. The caller should | |
346 | * not free this data directly (it will be freed when the underlying buffer gets | |
347 | * freed | |
348 | */ | |
80e0ecbf DSH |
349 | __owur static ossl_inline int PACKET_get_bytes(PACKET *pkt, |
350 | unsigned char **data, | |
351 | size_t len) | |
7e729bb5 MC |
352 | { |
353 | if (!PACKET_peek_bytes(pkt, data, len)) | |
354 | return 0; | |
355 | ||
6a12a574 | 356 | packet_forward(pkt, len); |
7e729bb5 MC |
357 | |
358 | return 1; | |
359 | } | |
360 | ||
361 | /* Peek ahead at |len| bytes from |pkt| and copy them to |data| */ | |
80e0ecbf DSH |
362 | __owur static ossl_inline int PACKET_peek_copy_bytes(const PACKET *pkt, |
363 | unsigned char *data, | |
364 | size_t len) | |
7e729bb5 MC |
365 | { |
366 | if (PACKET_remaining(pkt) < len) | |
367 | return 0; | |
368 | ||
369 | memcpy(data, pkt->curr, len); | |
370 | ||
371 | return 1; | |
372 | } | |
373 | ||
6d41fc80 EK |
374 | /* |
375 | * Read |len| bytes from |pkt| and copy them to |data|. | |
376 | * The caller is responsible for ensuring that |data| can hold |len| bytes. | |
377 | */ | |
80e0ecbf DSH |
378 | __owur static ossl_inline int PACKET_copy_bytes(PACKET *pkt, |
379 | unsigned char *data, | |
380 | size_t len) | |
7e729bb5 MC |
381 | { |
382 | if (!PACKET_peek_copy_bytes(pkt, data, len)) | |
383 | return 0; | |
384 | ||
6a12a574 | 385 | packet_forward(pkt, len); |
7e729bb5 MC |
386 | |
387 | return 1; | |
388 | } | |
389 | ||
67202973 EK |
390 | /* |
391 | * Copy packet data to |dest|, and set |len| to the number of copied bytes. | |
392 | * If the packet has more than |dest_len| bytes, nothing is copied. | |
393 | * Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise. | |
394 | * Does not forward PACKET position (because it is typically the last thing | |
395 | * done with a given PACKET). | |
396 | */ | |
80e0ecbf DSH |
397 | __owur static ossl_inline int PACKET_copy_all(const PACKET *pkt, |
398 | unsigned char *dest, | |
399 | size_t dest_len, size_t *len) | |
400 | { | |
67202973 EK |
401 | if (PACKET_remaining(pkt) > dest_len) { |
402 | *len = 0; | |
403 | return 0; | |
404 | } | |
405 | *len = pkt->remaining; | |
406 | memcpy(dest, pkt->curr, pkt->remaining); | |
407 | return 1; | |
408 | } | |
409 | ||
6d41fc80 EK |
410 | /* |
411 | * Copy |pkt| bytes to a newly allocated buffer and store a pointer to the | |
412 | * result in |*data|, and the length in |len|. | |
413 | * If |*data| is not NULL, the old data is OPENSSL_free'd. | |
414 | * If the packet is empty, or malloc fails, |*data| will be set to NULL. | |
415 | * Returns 1 if the malloc succeeds and 0 otherwise. | |
416 | * Does not forward PACKET position (because it is typically the last thing | |
417 | * done with a given PACKET). | |
418 | */ | |
80e0ecbf DSH |
419 | __owur static ossl_inline int PACKET_memdup(const PACKET *pkt, |
420 | unsigned char **data, size_t *len) | |
6d41fc80 EK |
421 | { |
422 | size_t length; | |
423 | ||
424 | OPENSSL_free(*data); | |
425 | *data = NULL; | |
426 | *len = 0; | |
427 | ||
428 | length = PACKET_remaining(pkt); | |
429 | ||
430 | if (length == 0) | |
431 | return 1; | |
432 | ||
7644a9ae | 433 | *data = OPENSSL_memdup(pkt->curr, length); |
6d41fc80 EK |
434 | if (*data == NULL) |
435 | return 0; | |
436 | ||
437 | *len = length; | |
438 | return 1; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Read a C string from |pkt| and copy to a newly allocated, NUL-terminated | |
443 | * buffer. Store a pointer to the result in |*data|. | |
444 | * If |*data| is not NULL, the old data is OPENSSL_free'd. | |
445 | * If the data in |pkt| does not contain a NUL-byte, the entire data is | |
446 | * copied and NUL-terminated. | |
447 | * Returns 1 if the malloc succeeds and 0 otherwise. | |
448 | * Does not forward PACKET position (because it is typically the last thing done | |
449 | * with a given PACKET). | |
450 | */ | |
80e0ecbf | 451 | __owur static ossl_inline int PACKET_strndup(const PACKET *pkt, char **data) |
6d41fc80 EK |
452 | { |
453 | OPENSSL_free(*data); | |
32942870 EK |
454 | |
455 | /* This will succeed on an empty packet, unless pkt->curr == NULL. */ | |
80e0ecbf | 456 | *data = OPENSSL_strndup((const char *)pkt->curr, PACKET_remaining(pkt)); |
6d41fc80 EK |
457 | return (*data != NULL); |
458 | } | |
459 | ||
7e729bb5 | 460 | /* Move the current reading position forward |len| bytes */ |
80e0ecbf | 461 | __owur static ossl_inline int PACKET_forward(PACKET *pkt, size_t len) |
7e729bb5 MC |
462 | { |
463 | if (PACKET_remaining(pkt) < len) | |
464 | return 0; | |
465 | ||
6a12a574 | 466 | packet_forward(pkt, len); |
7e729bb5 MC |
467 | |
468 | return 1; | |
469 | } | |
470 | ||
ec30e856 EK |
471 | /* |
472 | * Reads a variable-length vector prefixed with a one-byte length, and stores | |
473 | * the contents in |subpkt|. |pkt| can equal |subpkt|. | |
474 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
475 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
476 | * Upon failure, the original |pkt| and |subpkt| are not modified. | |
477 | */ | |
80e0ecbf DSH |
478 | __owur static ossl_inline int PACKET_get_length_prefixed_1(PACKET *pkt, |
479 | PACKET *subpkt) | |
ec30e856 | 480 | { |
80e0ecbf DSH |
481 | unsigned int length; |
482 | unsigned char *data; | |
483 | PACKET tmp = *pkt; | |
484 | if (!PACKET_get_1(&tmp, &length) || | |
485 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) { | |
486 | return 0; | |
487 | } | |
488 | ||
489 | *pkt = tmp; | |
490 | subpkt->curr = data; | |
491 | subpkt->remaining = length; | |
492 | ||
493 | return 1; | |
ec30e856 EK |
494 | } |
495 | ||
496 | /* | |
497 | * Reads a variable-length vector prefixed with a two-byte length, and stores | |
498 | * the contents in |subpkt|. |pkt| can equal |subpkt|. | |
499 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
500 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
501 | * Upon failure, the original |pkt| and |subpkt| are not modified. | |
502 | */ | |
80e0ecbf DSH |
503 | __owur static ossl_inline int PACKET_get_length_prefixed_2(PACKET *pkt, |
504 | PACKET *subpkt) | |
ec30e856 | 505 | { |
80e0ecbf DSH |
506 | unsigned int length; |
507 | unsigned char *data; | |
508 | PACKET tmp = *pkt; | |
509 | if (!PACKET_get_net_2(&tmp, &length) || | |
510 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) { | |
511 | return 0; | |
512 | } | |
513 | ||
514 | *pkt = tmp; | |
515 | subpkt->curr = data; | |
516 | subpkt->remaining = length; | |
517 | ||
518 | return 1; | |
ec30e856 EK |
519 | } |
520 | ||
521 | /* | |
522 | * Reads a variable-length vector prefixed with a three-byte length, and stores | |
523 | * the contents in |subpkt|. |pkt| can equal |subpkt|. | |
524 | * Data is not copied: the |subpkt| packet will share its underlying buffer with | |
525 | * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|. | |
526 | * Upon failure, the original |pkt| and |subpkt| are not modified. | |
527 | */ | |
80e0ecbf DSH |
528 | __owur static ossl_inline int PACKET_get_length_prefixed_3(PACKET *pkt, |
529 | PACKET *subpkt) | |
ec30e856 | 530 | { |
80e0ecbf DSH |
531 | unsigned long length; |
532 | unsigned char *data; | |
533 | PACKET tmp = *pkt; | |
534 | if (!PACKET_get_net_3(&tmp, &length) || | |
535 | !PACKET_get_bytes(&tmp, &data, (size_t)length)) { | |
536 | return 0; | |
537 | } | |
538 | ||
539 | *pkt = tmp; | |
540 | subpkt->curr = data; | |
541 | subpkt->remaining = length; | |
542 | ||
543 | return 1; | |
ec30e856 | 544 | } |
7e729bb5 MC |
545 | # ifdef __cplusplus |
546 | } | |
547 | # endif | |
548 | ||
80e0ecbf | 549 | #endif /* HEADER_PACKET_LOCL_H */ |