1 /* ssl/packet_locl.h */
3 * Written by Matt Caswell for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 2015 The OpenSSL Project. All rights reserved.
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36 * "This product includes software developed by the OpenSSL Project
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51 * ====================================================================
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).
59 #ifndef HEADER_PACKET_LOCL_H
60 # define HEADER_PACKET_LOCL_H
63 # include <openssl/bn.h>
64 # include <openssl/buffer.h>
72 /* Pointer to the start of the buffer data */
75 /* Pointer to the first byte after the end of the buffer data */
78 /* Pointer to where we are currently reading from */
83 * Returns the number of bytes remaining to be read in the PACKET
85 __owur static inline size_t PACKET_remaining(const PACKET *pkt)
87 return (size_t)(pkt->end - pkt->curr);
91 * Initialise a PACKET with |len| bytes held in |buf|. This does not make a
92 * copy of the data so |buf| must be present for the whole time that the PACKET
95 static inline int PACKET_buf_init(PACKET *pkt, unsigned char *buf, size_t len)
97 pkt->start = pkt->curr = buf;
98 pkt->end = pkt->start + len;
101 if (pkt->start > pkt->end
102 || pkt->curr < pkt->start
103 || pkt->curr > pkt->end
104 || len != (size_t)(pkt->end - pkt->start)) {
112 * Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|.
113 * Data is not copied: the |subpkt| packet will share its underlying buffer with
114 * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
116 __owur static inline int PACKET_peek_sub_packet(const PACKET *pkt,
117 PACKET *subpkt, size_t len)
119 if (PACKET_remaining(pkt) < len)
122 PACKET_buf_init(subpkt, pkt->curr, len);
128 * Initialize |subpkt| with the next |len| bytes read from |pkt|. Data is not
129 * copied: the |subpkt| packet will share its underlying buffer with the
130 * original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
132 __owur static inline int PACKET_get_sub_packet(PACKET *pkt, PACKET *subpkt,
135 if (!PACKET_peek_sub_packet(pkt, subpkt, len))
143 /* Peek ahead at 2 bytes in network order from |pkt| and store the value in
146 __owur static inline int PACKET_peek_net_2(const PACKET *pkt,
149 if (PACKET_remaining(pkt) < 2)
152 *data = ((unsigned int)(*pkt->curr)) << 8;
153 *data |= *(pkt->curr + 1);
158 /* Equivalent of n2s */
159 /* Get 2 bytes in network order from |pkt| and store the value in |*data| */
160 __owur static inline int PACKET_get_net_2(PACKET *pkt, unsigned int *data)
162 if (!PACKET_peek_net_2(pkt, data))
170 /* Peek ahead at 3 bytes in network order from |pkt| and store the value in
173 __owur static inline int PACKET_peek_net_3(const PACKET *pkt,
176 if (PACKET_remaining(pkt) < 3)
179 *data = ((unsigned long)(*pkt->curr)) << 16;
180 *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
181 *data |= *(pkt->curr + 2);
186 /* Equivalent of n2l3 */
187 /* Get 3 bytes in network order from |pkt| and store the value in |*data| */
188 __owur static inline int PACKET_get_net_3(PACKET *pkt, unsigned long *data)
190 if (!PACKET_peek_net_3(pkt, data))
198 /* Peek ahead at 4 bytes in network order from |pkt| and store the value in
201 __owur static inline int PACKET_peek_net_4(const PACKET *pkt,
204 if (PACKET_remaining(pkt) < 4)
207 *data = ((unsigned long)(*pkt->curr)) << 24;
208 *data |= ((unsigned long)(*(pkt->curr + 1))) << 16;
209 *data |= ((unsigned long)(*(pkt->curr + 2))) << 8;
210 *data |= *(pkt->curr+3);
215 /* Equivalent of n2l */
216 /* Get 4 bytes in network order from |pkt| and store the value in |*data| */
217 __owur static inline int PACKET_get_net_4(PACKET *pkt, unsigned long *data)
219 if (!PACKET_peek_net_4(pkt, data))
227 /* Peek ahead at 1 byte from |pkt| and store the value in |*data| */
228 __owur static inline int PACKET_peek_1(const PACKET *pkt, unsigned int *data)
230 if (!PACKET_remaining(pkt))
238 /* Get 1 byte from |pkt| and store the value in |*data| */
239 __owur static inline int PACKET_get_1(PACKET *pkt, unsigned int *data)
241 if (!PACKET_peek_1(pkt, data))
250 * Peek ahead at 4 bytes in reverse network order from |pkt| and store the value
253 __owur static inline int PACKET_peek_4(const PACKET *pkt, unsigned long *data)
255 if (PACKET_remaining(pkt) < 4)
259 *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
260 *data |= ((unsigned long)(*(pkt->curr + 2))) << 16;
261 *data |= ((unsigned long)(*(pkt->curr + 3))) << 24;
266 /* Equivalent of c2l */
268 * Get 4 bytes in reverse network order from |pkt| and store the value in
271 __owur static inline int PACKET_get_4(PACKET *pkt, unsigned long *data)
273 if (!PACKET_peek_4(pkt, data))
282 * Peek ahead at |len| bytes from the |pkt| and store a pointer to them in
283 * |*data|. This just points at the underlying buffer that |pkt| is using. The
284 * caller should not free this data directly (it will be freed when the
285 * underlying buffer gets freed
287 __owur static inline int PACKET_peek_bytes(const PACKET *pkt, unsigned char **data,
290 if (PACKET_remaining(pkt) < len)
299 * Read |len| bytes from the |pkt| and store a pointer to them in |*data|. This
300 * just points at the underlying buffer that |pkt| is using. The caller should
301 * not free this data directly (it will be freed when the underlying buffer gets
304 __owur static inline int PACKET_get_bytes(PACKET *pkt, unsigned char **data,
307 if (!PACKET_peek_bytes(pkt, data, len))
315 /* Peek ahead at |len| bytes from |pkt| and copy them to |data| */
316 __owur static inline int PACKET_peek_copy_bytes(const PACKET *pkt,
317 unsigned char *data, size_t len)
319 if (PACKET_remaining(pkt) < len)
322 memcpy(data, pkt->curr, len);
327 /* Read |len| bytes from |pkt| and copy them to |data| */
328 __owur static inline int PACKET_copy_bytes(PACKET *pkt, unsigned char *data,
331 if (!PACKET_peek_copy_bytes(pkt, data, len))
339 /* Move the current reading position back |len| bytes */
340 __owur static inline int PACKET_back(PACKET *pkt, size_t len)
342 if (len > (size_t)(pkt->curr - pkt->start))
350 /* Move the current reading position forward |len| bytes */
351 __owur static inline int PACKET_forward(PACKET *pkt, size_t len)
353 if (PACKET_remaining(pkt) < len)
361 /* Store a bookmark for the current reading position in |*bm| */
362 __owur static inline int PACKET_get_bookmark(const PACKET *pkt, size_t *bm)
364 *bm = pkt->curr - pkt->start;
369 /* Set the current reading position to the bookmark |bm| */
370 __owur static inline int PACKET_goto_bookmark(PACKET *pkt, size_t bm)
372 if (bm > (size_t)(pkt->end - pkt->start))
375 pkt->curr = pkt->start + bm;
381 * Stores the total length of the packet we have in the underlying buffer in
384 __owur static inline int PACKET_length(const PACKET *pkt, size_t *len)
386 *len = pkt->end - pkt->start;
395 #endif /* HEADER_PACKET_LOCL_H */