-/* ssl/packet_locl.h */
/*
- * Written by Matt Caswell for the OpenSSL project.
- */
-/* ====================================================================
- * Copyright (c) 2015 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
+ * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
*
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
#ifndef HEADER_PACKET_LOCL_H
# include <string.h>
# include <openssl/bn.h>
# include <openssl/buffer.h>
-# include "e_os.h"
+# include <openssl/crypto.h>
+# include <openssl/e_os2.h>
-# ifdef __cplusplus
-extern "C" {
-# endif
+# include "internal/numbers.h"
typedef struct {
- /* Pointer to the start of the buffer data */
- unsigned char *start;
-
- /* Pointer to the first byte after the end of the buffer data */
- unsigned char *end;
-
/* Pointer to where we are currently reading from */
- unsigned char *curr;
+ const unsigned char *curr;
+ /* Number of bytes remaining */
+ size_t remaining;
} PACKET;
+/* Internal unchecked shorthand; don't use outside this file. */
+static ossl_inline void packet_forward(PACKET *pkt, size_t len)
+{
+ pkt->curr += len;
+ pkt->remaining -= len;
+}
+
/*
* Returns the number of bytes remaining to be read in the PACKET
*/
-__owur static inline size_t PACKET_remaining(PACKET *pkt)
+static ossl_inline size_t PACKET_remaining(const PACKET *pkt)
+{
+ return pkt->remaining;
+}
+
+/*
+ * Returns a pointer to the first byte after the packet data.
+ * Useful for integrating with non-PACKET parsing code.
+ * Specifically, we use PACKET_end() to verify that a d2i_... call
+ * has consumed the entire packet contents.
+ */
+static ossl_inline const unsigned char *PACKET_end(const PACKET *pkt)
{
- return (size_t)(pkt->end - pkt->curr);
+ return pkt->curr + pkt->remaining;
+}
+
+/*
+ * Returns a pointer to the PACKET's current position.
+ * For use in non-PACKETized APIs.
+ */
+static ossl_inline const unsigned char *PACKET_data(const PACKET *pkt)
+{
+ return pkt->curr;
}
/*
* copy of the data so |buf| must be present for the whole time that the PACKET
* is being used.
*/
-static inline int PACKET_buf_init(PACKET *pkt, unsigned char *buf, size_t len)
+__owur static ossl_inline int PACKET_buf_init(PACKET *pkt,
+ const unsigned char *buf,
+ size_t len)
{
- pkt->start = pkt->curr = buf;
- pkt->end = pkt->start + len;
-
- /* Sanity checks */
- if (pkt->start > pkt->end
- || pkt->curr < pkt->start
- || pkt->curr > pkt->end
- || len != (size_t)(pkt->end - pkt->start)) {
+ /* Sanity check for negative values. */
+ if (len > (size_t)(SIZE_MAX / 2))
return 0;
- }
+ pkt->curr = buf;
+ pkt->remaining = len;
return 1;
}
+/* Initialize a PACKET to hold zero bytes. */
+static ossl_inline void PACKET_null_init(PACKET *pkt)
+{
+ pkt->curr = NULL;
+ pkt->remaining = 0;
+}
+
+/*
+ * Returns 1 if the packet has length |num| and its contents equal the |num|
+ * bytes read from |ptr|. Returns 0 otherwise (lengths or contents not equal).
+ * If lengths are equal, performs the comparison in constant time.
+ */
+__owur static ossl_inline int PACKET_equal(const PACKET *pkt, const void *ptr,
+ size_t num)
+{
+ if (PACKET_remaining(pkt) != num)
+ return 0;
+ return CRYPTO_memcmp(pkt->curr, ptr, num) == 0;
+}
+
/*
* Peek ahead and initialize |subpkt| with the next |len| bytes read from |pkt|.
* Data is not copied: the |subpkt| packet will share its underlying buffer with
* the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
*/
-__owur static inline int PACKET_peek_sub_packet(PACKET *pkt, PACKET *subpkt,
- size_t len)
+__owur static ossl_inline int PACKET_peek_sub_packet(const PACKET *pkt,
+ PACKET *subpkt, size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
- PACKET_buf_init(subpkt, pkt->curr, len);
-
- return 1;
+ return PACKET_buf_init(subpkt, pkt->curr, len);
}
/*
* copied: the |subpkt| packet will share its underlying buffer with the
* original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
*/
-__owur static inline int PACKET_get_sub_packet(PACKET *pkt, PACKET *subpkt,
- size_t len)
+__owur static ossl_inline int PACKET_get_sub_packet(PACKET *pkt,
+ PACKET *subpkt, size_t len)
{
if (!PACKET_peek_sub_packet(pkt, subpkt, len))
return 0;
- pkt->curr += len;
+ packet_forward(pkt, len);
return 1;
}
-/* Peek ahead at 2 bytes in network order from |pkt| and store the value in
+/*
+ * Peek ahead at 2 bytes in network order from |pkt| and store the value in
* |*data|
*/
-__owur static inline int PACKET_peek_net_2(PACKET *pkt, unsigned int *data)
+__owur static ossl_inline int PACKET_peek_net_2(const PACKET *pkt,
+ unsigned int *data)
{
if (PACKET_remaining(pkt) < 2)
return 0;
- *data = ((unsigned int)(*pkt->curr)) << 8;
+ *data = ((unsigned int)(*pkt->curr)) << 8;
*data |= *(pkt->curr + 1);
return 1;
/* Equivalent of n2s */
/* Get 2 bytes in network order from |pkt| and store the value in |*data| */
-__owur static inline int PACKET_get_net_2(PACKET *pkt, unsigned int *data)
+__owur static ossl_inline int PACKET_get_net_2(PACKET *pkt, unsigned int *data)
{
if (!PACKET_peek_net_2(pkt, data))
return 0;
- pkt->curr += 2;
+ packet_forward(pkt, 2);
return 1;
}
-/* Peek ahead at 3 bytes in network order from |pkt| and store the value in
+/* Same as PACKET_get_net_2() but for a size_t */
+__owur static ossl_inline int PACKET_get_net_2_len(PACKET *pkt, size_t *data)
+{
+ unsigned int i;
+ int ret = PACKET_get_net_2(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
+/*
+ * Peek ahead at 3 bytes in network order from |pkt| and store the value in
* |*data|
*/
-__owur static inline int PACKET_peek_net_3(PACKET *pkt, unsigned long *data)
+__owur static ossl_inline int PACKET_peek_net_3(const PACKET *pkt,
+ unsigned long *data)
{
if (PACKET_remaining(pkt) < 3)
return 0;
- *data = ((unsigned long)(*pkt->curr)) << 16;
- *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
+ *data = ((unsigned long)(*pkt->curr)) << 16;
+ *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
*data |= *(pkt->curr + 2);
return 1;
/* Equivalent of n2l3 */
/* Get 3 bytes in network order from |pkt| and store the value in |*data| */
-__owur static inline int PACKET_get_net_3(PACKET *pkt, unsigned long *data)
+__owur static ossl_inline int PACKET_get_net_3(PACKET *pkt, unsigned long *data)
{
if (!PACKET_peek_net_3(pkt, data))
return 0;
- pkt->curr += 3;
+ packet_forward(pkt, 3);
return 1;
}
-/* Peek ahead at 4 bytes in network order from |pkt| and store the value in
+/* Same as PACKET_get_net_3() but for a size_t */
+__owur static ossl_inline int PACKET_get_net_3_len(PACKET *pkt, size_t *data)
+{
+ unsigned long i;
+ int ret = PACKET_get_net_3(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
+/*
+ * Peek ahead at 4 bytes in network order from |pkt| and store the value in
* |*data|
*/
-__owur static inline int PACKET_peek_net_4(PACKET *pkt, unsigned long *data)
+__owur static ossl_inline int PACKET_peek_net_4(const PACKET *pkt,
+ unsigned long *data)
{
if (PACKET_remaining(pkt) < 4)
return 0;
- *data = ((unsigned long)(*pkt->curr)) << 24;
+ *data = ((unsigned long)(*pkt->curr)) << 24;
*data |= ((unsigned long)(*(pkt->curr + 1))) << 16;
- *data |= ((unsigned long)(*(pkt->curr + 2))) << 8;
- *data |= *(pkt->curr+3);
+ *data |= ((unsigned long)(*(pkt->curr + 2))) << 8;
+ *data |= *(pkt->curr + 3);
return 1;
}
/* Equivalent of n2l */
/* Get 4 bytes in network order from |pkt| and store the value in |*data| */
-__owur static inline int PACKET_get_net_4(PACKET *pkt, unsigned long *data)
+__owur static ossl_inline int PACKET_get_net_4(PACKET *pkt, unsigned long *data)
{
if (!PACKET_peek_net_4(pkt, data))
return 0;
- pkt->curr += 4;
+ packet_forward(pkt, 4);
return 1;
}
+/* Same as PACKET_get_net_4() but for a size_t */
+__owur static ossl_inline int PACKET_get_net_4_len(PACKET *pkt, size_t *data)
+{
+ unsigned long i;
+ int ret = PACKET_get_net_4(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
/* Peek ahead at 1 byte from |pkt| and store the value in |*data| */
-__owur static inline int PACKET_peek_1(PACKET *pkt, unsigned int *data)
+__owur static ossl_inline int PACKET_peek_1(const PACKET *pkt,
+ unsigned int *data)
{
if (!PACKET_remaining(pkt))
return 0;
}
/* Get 1 byte from |pkt| and store the value in |*data| */
-__owur static inline int PACKET_get_1(PACKET *pkt, unsigned int *data)
+__owur static ossl_inline int PACKET_get_1(PACKET *pkt, unsigned int *data)
{
if (!PACKET_peek_1(pkt, data))
return 0;
- pkt->curr++;
+ packet_forward(pkt, 1);
return 1;
}
+/* Same as PACKET_get_1() but for a size_t */
+__owur static ossl_inline int PACKET_get_1_len(PACKET *pkt, size_t *data)
+{
+ unsigned int i;
+ int ret = PACKET_get_1(pkt, &i);
+
+ if (ret)
+ *data = (size_t)i;
+
+ return ret;
+}
+
/*
* Peek ahead at 4 bytes in reverse network order from |pkt| and store the value
* in |*data|
*/
-__owur static inline int PACKET_peek_4(PACKET *pkt, unsigned long *data)
+__owur static ossl_inline int PACKET_peek_4(const PACKET *pkt,
+ unsigned long *data)
{
if (PACKET_remaining(pkt) < 4)
return 0;
- *data = *pkt->curr;
- *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
+ *data = *pkt->curr;
+ *data |= ((unsigned long)(*(pkt->curr + 1))) << 8;
*data |= ((unsigned long)(*(pkt->curr + 2))) << 16;
*data |= ((unsigned long)(*(pkt->curr + 3))) << 24;
* Get 4 bytes in reverse network order from |pkt| and store the value in
* |*data|
*/
-__owur static inline int PACKET_get_4(PACKET *pkt, unsigned long *data)
+__owur static ossl_inline int PACKET_get_4(PACKET *pkt, unsigned long *data)
{
if (!PACKET_peek_4(pkt, data))
return 0;
- pkt->curr += 4;
+ packet_forward(pkt, 4);
return 1;
}
* caller should not free this data directly (it will be freed when the
* underlying buffer gets freed
*/
-__owur static inline int PACKET_peek_bytes(PACKET *pkt, unsigned char **data,
- size_t len)
+__owur static ossl_inline int PACKET_peek_bytes(const PACKET *pkt,
+ const unsigned char **data,
+ size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
* not free this data directly (it will be freed when the underlying buffer gets
* freed
*/
-__owur static inline int PACKET_get_bytes(PACKET *pkt, unsigned char **data,
- size_t len)
+__owur static ossl_inline int PACKET_get_bytes(PACKET *pkt,
+ const unsigned char **data,
+ size_t len)
{
if (!PACKET_peek_bytes(pkt, data, len))
return 0;
- pkt->curr += len;
+ packet_forward(pkt, len);
return 1;
}
/* Peek ahead at |len| bytes from |pkt| and copy them to |data| */
-__owur static inline int PACKET_peek_copy_bytes(PACKET *pkt,
- unsigned char *data, size_t len)
+__owur static ossl_inline int PACKET_peek_copy_bytes(const PACKET *pkt,
+ unsigned char *data,
+ size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
return 1;
}
-/* Read |len| bytes from |pkt| and copy them to |data| */
-__owur static inline int PACKET_copy_bytes(PACKET *pkt, unsigned char *data,
- size_t len)
+/*
+ * Read |len| bytes from |pkt| and copy them to |data|.
+ * The caller is responsible for ensuring that |data| can hold |len| bytes.
+ */
+__owur static ossl_inline int PACKET_copy_bytes(PACKET *pkt,
+ unsigned char *data, size_t len)
{
if (!PACKET_peek_copy_bytes(pkt, data, len))
return 0;
- pkt->curr += len;
+ packet_forward(pkt, len);
return 1;
}
-/* Move the current reading position back |len| bytes */
-__owur static inline int PACKET_back(PACKET *pkt, size_t len)
+/*
+ * Copy packet data to |dest|, and set |len| to the number of copied bytes.
+ * If the packet has more than |dest_len| bytes, nothing is copied.
+ * Returns 1 if the packet data fits in |dest_len| bytes, 0 otherwise.
+ * Does not forward PACKET position (because it is typically the last thing
+ * done with a given PACKET).
+ */
+__owur static ossl_inline int PACKET_copy_all(const PACKET *pkt,
+ unsigned char *dest,
+ size_t dest_len, size_t *len)
{
- if (len > (size_t)(pkt->curr - pkt->start))
+ if (PACKET_remaining(pkt) > dest_len) {
+ *len = 0;
return 0;
+ }
+ *len = pkt->remaining;
+ memcpy(dest, pkt->curr, pkt->remaining);
+ return 1;
+}
+
+/*
+ * Copy |pkt| bytes to a newly allocated buffer and store a pointer to the
+ * result in |*data|, and the length in |len|.
+ * If |*data| is not NULL, the old data is OPENSSL_free'd.
+ * If the packet is empty, or malloc fails, |*data| will be set to NULL.
+ * Returns 1 if the malloc succeeds and 0 otherwise.
+ * Does not forward PACKET position (because it is typically the last thing
+ * done with a given PACKET).
+ */
+__owur static ossl_inline int PACKET_memdup(const PACKET *pkt,
+ unsigned char **data, size_t *len)
+{
+ size_t length;
+
+ OPENSSL_free(*data);
+ *data = NULL;
+ *len = 0;
+
+ length = PACKET_remaining(pkt);
- pkt->curr -= len;
+ if (length == 0)
+ return 1;
+ *data = OPENSSL_memdup(pkt->curr, length);
+ if (*data == NULL)
+ return 0;
+
+ *len = length;
return 1;
}
+/*
+ * Read a C string from |pkt| and copy to a newly allocated, NUL-terminated
+ * buffer. Store a pointer to the result in |*data|.
+ * If |*data| is not NULL, the old data is OPENSSL_free'd.
+ * If the data in |pkt| does not contain a NUL-byte, the entire data is
+ * copied and NUL-terminated.
+ * Returns 1 if the malloc succeeds and 0 otherwise.
+ * Does not forward PACKET position (because it is typically the last thing done
+ * with a given PACKET).
+ */
+__owur static ossl_inline int PACKET_strndup(const PACKET *pkt, char **data)
+{
+ OPENSSL_free(*data);
+
+ /* This will succeed on an empty packet, unless pkt->curr == NULL. */
+ *data = OPENSSL_strndup((const char *)pkt->curr, PACKET_remaining(pkt));
+ return (*data != NULL);
+}
+
+/* Returns 1 if |pkt| contains at least one 0-byte, 0 otherwise. */
+static ossl_inline int PACKET_contains_zero_byte(const PACKET *pkt)
+{
+ return memchr(pkt->curr, 0, pkt->remaining) != NULL;
+}
+
/* Move the current reading position forward |len| bytes */
-__owur static inline int PACKET_forward(PACKET *pkt, size_t len)
+__owur static ossl_inline int PACKET_forward(PACKET *pkt, size_t len)
{
if (PACKET_remaining(pkt) < len)
return 0;
- pkt->curr += len;
+ packet_forward(pkt, len);
return 1;
}
-/* Store a bookmark for the current reading position in |*bm| */
-__owur static inline int PACKET_get_bookmark(PACKET *pkt, size_t *bm)
+/*
+ * Reads a variable-length vector prefixed with a one-byte length, and stores
+ * the contents in |subpkt|. |pkt| can equal |subpkt|.
+ * Data is not copied: the |subpkt| packet will share its underlying buffer with
+ * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
+ * Upon failure, the original |pkt| and |subpkt| are not modified.
+ */
+__owur static ossl_inline int PACKET_get_length_prefixed_1(PACKET *pkt,
+ PACKET *subpkt)
{
- *bm = pkt->curr - pkt->start;
+ unsigned int length;
+ const unsigned char *data;
+ PACKET tmp = *pkt;
+ if (!PACKET_get_1(&tmp, &length) ||
+ !PACKET_get_bytes(&tmp, &data, (size_t)length)) {
+ return 0;
+ }
+
+ *pkt = tmp;
+ subpkt->curr = data;
+ subpkt->remaining = length;
+
+ return 1;
+}
+
+/*
+ * Like PACKET_get_length_prefixed_1, but additionally, fails when there are
+ * leftover bytes in |pkt|.
+ */
+__owur static ossl_inline int PACKET_as_length_prefixed_1(PACKET *pkt,
+ PACKET *subpkt)
+{
+ unsigned int length;
+ const unsigned char *data;
+ PACKET tmp = *pkt;
+ if (!PACKET_get_1(&tmp, &length) ||
+ !PACKET_get_bytes(&tmp, &data, (size_t)length) ||
+ PACKET_remaining(&tmp) != 0) {
+ return 0;
+ }
+
+ *pkt = tmp;
+ subpkt->curr = data;
+ subpkt->remaining = length;
return 1;
}
-/* Set the current reading position to the bookmark |bm| */
-__owur static inline int PACKET_goto_bookmark(PACKET *pkt, size_t bm)
+/*
+ * Reads a variable-length vector prefixed with a two-byte length, and stores
+ * the contents in |subpkt|. |pkt| can equal |subpkt|.
+ * Data is not copied: the |subpkt| packet will share its underlying buffer with
+ * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
+ * Upon failure, the original |pkt| and |subpkt| are not modified.
+ */
+__owur static ossl_inline int PACKET_get_length_prefixed_2(PACKET *pkt,
+ PACKET *subpkt)
{
- if (bm > (size_t)(pkt->end - pkt->start))
+ unsigned int length;
+ const unsigned char *data;
+ PACKET tmp = *pkt;
+
+ if (!PACKET_get_net_2(&tmp, &length) ||
+ !PACKET_get_bytes(&tmp, &data, (size_t)length)) {
return 0;
+ }
- pkt->curr = pkt->start + bm;
+ *pkt = tmp;
+ subpkt->curr = data;
+ subpkt->remaining = length;
return 1;
}
/*
- * Stores the total length of the packet we have in the underlying buffer in
- * |*len|
+ * Like PACKET_get_length_prefixed_2, but additionally, fails when there are
+ * leftover bytes in |pkt|.
*/
-__owur static inline int PACKET_length(PACKET *pkt, size_t *len)
+__owur static ossl_inline int PACKET_as_length_prefixed_2(PACKET *pkt,
+ PACKET *subpkt)
{
- *len = pkt->end - pkt->start;
+ unsigned int length;
+ const unsigned char *data;
+ PACKET tmp = *pkt;
+
+ if (!PACKET_get_net_2(&tmp, &length) ||
+ !PACKET_get_bytes(&tmp, &data, (size_t)length) ||
+ PACKET_remaining(&tmp) != 0) {
+ return 0;
+ }
+
+ *pkt = tmp;
+ subpkt->curr = data;
+ subpkt->remaining = length;
return 1;
}
-# ifdef __cplusplus
+/*
+ * Reads a variable-length vector prefixed with a three-byte length, and stores
+ * the contents in |subpkt|. |pkt| can equal |subpkt|.
+ * Data is not copied: the |subpkt| packet will share its underlying buffer with
+ * the original |pkt|, so data wrapped by |pkt| must outlive the |subpkt|.
+ * Upon failure, the original |pkt| and |subpkt| are not modified.
+ */
+__owur static ossl_inline int PACKET_get_length_prefixed_3(PACKET *pkt,
+ PACKET *subpkt)
+{
+ unsigned long length;
+ const unsigned char *data;
+ PACKET tmp = *pkt;
+ if (!PACKET_get_net_3(&tmp, &length) ||
+ !PACKET_get_bytes(&tmp, &data, (size_t)length)) {
+ return 0;
+ }
+
+ *pkt = tmp;
+ subpkt->curr = data;
+ subpkt->remaining = length;
+
+ return 1;
}
-# endif
-#endif /* HEADER_PACKET_LOCL_H */
+/* Writeable packets */
+
+typedef struct wpacket_sub WPACKET_SUB;
+struct wpacket_sub {
+ /* The parent WPACKET_SUB if we have one or NULL otherwise */
+ WPACKET_SUB *parent;
+
+ /*
+ * Offset into the buffer where the length of this WPACKET goes. We use an
+ * offset in case the buffer grows and gets reallocated.
+ */
+ size_t packet_len;
+
+ /* Number of bytes in the packet_len or 0 if we don't write the length */
+ size_t lenbytes;
+
+ /* Number of bytes written to the buf prior to this packet starting */
+ size_t pwritten;
+
+ /* Flags for this sub-packet */
+ unsigned int flags;
+};
+
+typedef struct wpacket_st WPACKET;
+struct wpacket_st {
+ /* The buffer where we store the output data */
+ BUF_MEM *buf;
+
+ /* Fixed sized buffer which can be used as an alternative to buf */
+ unsigned char *staticbuf;
+
+ /*
+ * Offset into the buffer where we are currently writing. We use an offset
+ * in case the buffer grows and gets reallocated.
+ */
+ size_t curr;
+
+ /* Number of bytes written so far */
+ size_t written;
+
+ /* Maximum number of bytes we will allow to be written to this WPACKET */
+ size_t maxsize;
+
+ /* Our sub-packets (always at least one if not finished) */
+ WPACKET_SUB *subs;
+};
+
+/* Flags */
+
+/* Default */
+#define WPACKET_FLAGS_NONE 0
+
+/* Error on WPACKET_close() if no data written to the WPACKET */
+#define WPACKET_FLAGS_NON_ZERO_LENGTH 1
+
+/*
+ * Abandon all changes on WPACKET_close() if no data written to the WPACKET,
+ * i.e. this does not write out a zero packet length
+ */
+#define WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH 2
+
+
+/*
+ * Initialise a WPACKET with the buffer in |buf|. The buffer must exist
+ * for the whole time that the WPACKET is being used. Additionally |lenbytes| of
+ * data is preallocated at the start of the buffer to store the length of the
+ * WPACKET once we know it.
+ */
+int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes);
+
+/*
+ * Same as WPACKET_init_len except there is no preallocation of the WPACKET
+ * length.
+ */
+int WPACKET_init(WPACKET *pkt, BUF_MEM *buf);
+
+/*
+ * Same as WPACKET_init_len except we do not use a growable BUF_MEM structure.
+ * A fixed buffer of memory |buf| of size |len| is used instead. A failure will
+ * occur if you attempt to write beyond the end of the buffer
+ */
+int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len,
+ size_t lenbytes);
+/*
+ * Set the flags to be applied to the current sub-packet
+ */
+int WPACKET_set_flags(WPACKET *pkt, unsigned int flags);
+
+/*
+ * Closes the most recent sub-packet. It also writes out the length of the
+ * packet to the required location (normally the start of the WPACKET) if
+ * appropriate. The top level WPACKET should be closed using WPACKET_finish()
+ * instead of this function.
+ */
+int WPACKET_close(WPACKET *pkt);
+
+/*
+ * The same as WPACKET_close() but only for the top most WPACKET. Additionally
+ * frees memory resources for this WPACKET.
+ */
+int WPACKET_finish(WPACKET *pkt);
+
+/*
+ * Iterate through all the sub-packets and write out their lengths as if they
+ * were being closed. The lengths will be overwritten with the final lengths
+ * when the sub-packets are eventually closed (which may be different if more
+ * data is added to the WPACKET). This function fails if a sub-packet is of 0
+ * length and WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH is set.
+ */
+int WPACKET_fill_lengths(WPACKET *pkt);
+
+/*
+ * Initialise a new sub-packet. Additionally |lenbytes| of data is preallocated
+ * at the start of the sub-packet to store its length once we know it. Don't
+ * call this directly. Use the convenience macros below instead.
+ */
+int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes);
+
+/*
+ * Convenience macros for calling WPACKET_start_sub_packet_len with different
+ * lengths
+ */
+#define WPACKET_start_sub_packet_u8(pkt) \
+ WPACKET_start_sub_packet_len__((pkt), 1)
+#define WPACKET_start_sub_packet_u16(pkt) \
+ WPACKET_start_sub_packet_len__((pkt), 2)
+#define WPACKET_start_sub_packet_u24(pkt) \
+ WPACKET_start_sub_packet_len__((pkt), 3)
+#define WPACKET_start_sub_packet_u32(pkt) \
+ WPACKET_start_sub_packet_len__((pkt), 4)
+
+/*
+ * Same as WPACKET_start_sub_packet_len__() except no bytes are pre-allocated
+ * for the sub-packet length.
+ */
+int WPACKET_start_sub_packet(WPACKET *pkt);
+
+/*
+ * Allocate bytes in the WPACKET for the output. This reserves the bytes
+ * and counts them as "written", but doesn't actually do the writing. A pointer
+ * to the allocated bytes is stored in |*allocbytes|. |allocbytes| may be NULL.
+ * WARNING: the allocated bytes must be filled in immediately, without further
+ * WPACKET_* calls. If not then the underlying buffer may be realloc'd and
+ * change its location.
+ */
+int WPACKET_allocate_bytes(WPACKET *pkt, size_t len,
+ unsigned char **allocbytes);
+
+/*
+ * The same as WPACKET_allocate_bytes() except additionally a new sub-packet is
+ * started for the allocated bytes, and then closed immediately afterwards. The
+ * number of length bytes for the sub-packet is in |lenbytes|. Don't call this
+ * directly. Use the convenience macros below instead.
+ */
+int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
+ unsigned char **allocbytes, size_t lenbytes);
+
+/*
+ * Convenience macros for calling WPACKET_sub_allocate_bytes with different
+ * lengths
+ */
+#define WPACKET_sub_allocate_bytes_u8(pkt, len, bytes) \
+ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 1)
+#define WPACKET_sub_allocate_bytes_u16(pkt, len, bytes) \
+ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 2)
+#define WPACKET_sub_allocate_bytes_u24(pkt, len, bytes) \
+ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 3)
+#define WPACKET_sub_allocate_bytes_u32(pkt, len, bytes) \
+ WPACKET_sub_allocate_bytes__((pkt), (len), (bytes), 4)
+
+/*
+ * The same as WPACKET_allocate_bytes() except the reserved bytes are not
+ * actually counted as written. Typically this will be for when we don't know
+ * how big arbitrary data is going to be up front, but we do know what the
+ * maximum size will be. If this function is used, then it should be immediately
+ * followed by a WPACKET_allocate_bytes() call before any other WPACKET
+ * functions are called (unless the write to the allocated bytes is abandoned).
+ *
+ * For example: If we are generating a signature, then the size of that
+ * signature may not be known in advance. We can use WPACKET_reserve_bytes() to
+ * handle this:
+ *
+ * if (!WPACKET_sub_reserve_bytes_u16(&pkt, EVP_PKEY_size(pkey), &sigbytes1)
+ * || EVP_SignFinal(md_ctx, sigbytes1, &siglen, pkey) <= 0
+ * || !WPACKET_sub_allocate_bytes_u16(&pkt, siglen, &sigbytes2)
+ * || sigbytes1 != sigbytes2)
+ * goto err;
+ */
+int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes);
+
+/*
+ * The "reserve_bytes" equivalent of WPACKET_sub_allocate_bytes__()
+ */
+int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len,
+ unsigned char **allocbytes, size_t lenbytes);
+
+/*
+ * Convenience macros for WPACKET_sub_reserve_bytes with different lengths
+ */
+#define WPACKET_sub_reserve_bytes_u8(pkt, len, bytes) \
+ WPACKET_reserve_bytes__((pkt), (len), (bytes), 1)
+#define WPACKET_sub_reserve_bytes_u16(pkt, len, bytes) \
+ WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 2)
+#define WPACKET_sub_reserve_bytes_u24(pkt, len, bytes) \
+ WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 3)
+#define WPACKET_sub_reserve_bytes_u32(pkt, len, bytes) \
+ WPACKET_sub_reserve_bytes__((pkt), (len), (bytes), 4)
+
+/*
+ * Write the value stored in |val| into the WPACKET. The value will consume
+ * |bytes| amount of storage. An error will occur if |val| cannot be
+ * accommodated in |bytes| storage, e.g. attempting to write the value 256 into
+ * 1 byte will fail. Don't call this directly. Use the convenience macros below
+ * instead.
+ */
+int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t bytes);
+
+/*
+ * Convenience macros for calling WPACKET_put_bytes with different
+ * lengths
+ */
+#define WPACKET_put_bytes_u8(pkt, val) \
+ WPACKET_put_bytes__((pkt), (val), 1)
+#define WPACKET_put_bytes_u16(pkt, val) \
+ WPACKET_put_bytes__((pkt), (val), 2)
+#define WPACKET_put_bytes_u24(pkt, val) \
+ WPACKET_put_bytes__((pkt), (val), 3)
+#define WPACKET_put_bytes_u32(pkt, val) \
+ WPACKET_put_bytes__((pkt), (val), 4)
+
+/* Set a maximum size that we will not allow the WPACKET to grow beyond */
+int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize);
+
+/* Copy |len| bytes of data from |*src| into the WPACKET. */
+int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len);
+
+/* Set |len| bytes of data to |ch| into the WPACKET. */
+int WPACKET_memset(WPACKET *pkt, int ch, size_t len);
+
+/*
+ * Copy |len| bytes of data from |*src| into the WPACKET and prefix with its
+ * length (consuming |lenbytes| of data for the length). Don't call this
+ * directly. Use the convenience macros below instead.
+ */
+int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len,
+ size_t lenbytes);
+
+/* Convenience macros for calling WPACKET_sub_memcpy with different lengths */
+#define WPACKET_sub_memcpy_u8(pkt, src, len) \
+ WPACKET_sub_memcpy__((pkt), (src), (len), 1)
+#define WPACKET_sub_memcpy_u16(pkt, src, len) \
+ WPACKET_sub_memcpy__((pkt), (src), (len), 2)
+#define WPACKET_sub_memcpy_u24(pkt, src, len) \
+ WPACKET_sub_memcpy__((pkt), (src), (len), 3)
+#define WPACKET_sub_memcpy_u32(pkt, src, len) \
+ WPACKET_sub_memcpy__((pkt), (src), (len), 4)
+
+/*
+ * Return the total number of bytes written so far to the underlying buffer
+ * including any storage allocated for length bytes
+ */
+int WPACKET_get_total_written(WPACKET *pkt, size_t *written);
+
+/*
+ * Returns the length of the current sub-packet. This excludes any bytes
+ * allocated for the length itself.
+ */
+int WPACKET_get_length(WPACKET *pkt, size_t *len);
+
+/*
+ * Returns a pointer to the current write location, but does not allocate any
+ * bytes.
+ */
+unsigned char *WPACKET_get_curr(WPACKET *pkt);
+
+/* Release resources in a WPACKET if a failure has occurred. */
+void WPACKET_cleanup(WPACKET *pkt);
+#endif /* HEADER_PACKET_LOCL_H */
projects / openssl.git / blobdiff