/src/openssl/crypto/packet.c

Source (jump to first uncovered line)
/*
 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (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
 */

#include "internal/cryptlib.h"
#include "internal/packet.h"
#include <openssl/sslerr.h>

#define DEFAULT_BUF_SIZE    256

int WPACKET_allocate_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
{
    if (!WPACKET_reserve_bytes(pkt, len, allocbytes))
        return 0;

    pkt->written += len;
    pkt->curr += len;
    return 1;
}

int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
                                 unsigned char **allocbytes, size_t lenbytes)
{
    if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
            || !WPACKET_allocate_bytes(pkt, len, allocbytes)
            || !WPACKET_close(pkt))
        return 0;

    return 1;
}

#define GETBUF(p)   (((p)->staticbuf != NULL) \
                     ? (p)->staticbuf \
                     : ((p)->buf != NULL \
                        ? (unsigned char *)(p)->buf->data \
                        : NULL))

int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes)
{
    /* Internal API, so should not fail */
    if (!ossl_assert(pkt->subs != NULL && len != 0))
        return 0;

    if (pkt->maxsize - pkt->written < len)
        return 0;

    if (pkt->buf != NULL && (pkt->buf->length - pkt->written < len)) {
        size_t newlen;
        size_t reflen;

        reflen = (len > pkt->buf->length) ? len : pkt->buf->length;

        if (reflen > SIZE_MAX / 2) {
            newlen = SIZE_MAX;
        } else {
            newlen = reflen * 2;
            if (newlen < DEFAULT_BUF_SIZE)
                newlen = DEFAULT_BUF_SIZE;
        }
        if (BUF_MEM_grow(pkt->buf, newlen) == 0)
            return 0;
    }
    if (allocbytes != NULL)
        *allocbytes = WPACKET_get_curr(pkt);

    return 1;
}

int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len,
                                unsigned char **allocbytes, size_t lenbytes)
{
    if (!WPACKET_reserve_bytes(pkt, lenbytes + len, allocbytes))
        return 0;

    if (*allocbytes != NULL)
        *allocbytes += lenbytes;

    return 1;
}

static size_t maxmaxsize(size_t lenbytes)
{
    if (lenbytes >= sizeof(size_t) || lenbytes == 0)
        return SIZE_MAX;

    return ((size_t)1 << (lenbytes * 8)) - 1 + lenbytes;
}

static int wpacket_intern_init_len(WPACKET *pkt, size_t lenbytes)
{
    unsigned char *lenchars;

    pkt->curr = 0;
    pkt->written = 0;

    if ((pkt->subs = OPENSSL_zalloc(sizeof(*pkt->subs))) == NULL) {
        SSLerr(SSL_F_WPACKET_INTERN_INIT_LEN, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    if (lenbytes == 0)
        return 1;

    pkt->subs->pwritten = lenbytes;
    pkt->subs->lenbytes = lenbytes;

    if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) {
        OPENSSL_free(pkt->subs);
        pkt->subs = NULL;
        return 0;
    }
    pkt->subs->packet_len = 0;

    return 1;
}

int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len,
                            size_t lenbytes)
{
    size_t max = maxmaxsize(lenbytes);

    /* Internal API, so should not fail */
    if (!ossl_assert(buf != NULL && len > 0))
        return 0;

    pkt->staticbuf = buf;
    pkt->buf = NULL;
    pkt->maxsize = (max < len) ? max : len;

    return wpacket_intern_init_len(pkt, lenbytes);
}

int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes)
{
    /* Internal API, so should not fail */
    if (!ossl_assert(buf != NULL))
        return 0;

    pkt->staticbuf = NULL;
    pkt->buf = buf;
    pkt->maxsize = maxmaxsize(lenbytes);

    return wpacket_intern_init_len(pkt, lenbytes);
}

int WPACKET_init(WPACKET *pkt, BUF_MEM *buf)
{
    return WPACKET_init_len(pkt, buf, 0);
}

int WPACKET_init_null(WPACKET *pkt, size_t lenbytes)
{
    pkt->staticbuf = NULL;
    pkt->buf = NULL;
    pkt->maxsize = maxmaxsize(lenbytes);

    return wpacket_intern_init_len(pkt, 0);
}

int WPACKET_set_flags(WPACKET *pkt, unsigned int flags)
{
    /* Internal API, so should not fail */
    if (!ossl_assert(pkt->subs != NULL))
        return 0;

    pkt->subs->flags = flags;

    return 1;
}

/* Store the |value| of length |len| at location |data| */
static int put_value(unsigned char *data, size_t value, size_t len)
{
    if (data == NULL)
        return 1;

    for (data += len - 1; len > 0; len--) {
        *data = (unsigned char)(value & 0xff);
        data--;
        value >>= 8;
    }

    /* Check whether we could fit the value in the assigned number of bytes */
    if (value > 0)
        return 0;

    return 1;
}


/*
 * Internal helper function used by WPACKET_close(), WPACKET_finish() and
 * WPACKET_fill_lengths() to close a sub-packet and write out its length if
 * necessary. If |doclose| is 0 then it goes through the motions of closing
 * (i.e. it fills in all the lengths), but doesn't actually close anything.
 */
static int wpacket_intern_close(WPACKET *pkt, WPACKET_SUB *sub, int doclose)
{
    size_t packlen = pkt->written - sub->pwritten;

    if (packlen == 0
            && (sub->flags & WPACKET_FLAGS_NON_ZERO_LENGTH) != 0)
        return 0;

    if (packlen == 0
            && sub->flags & WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH) {
        /* We can't handle this case. Return an error */
        if (!doclose)
            return 0;

        /* Deallocate any bytes allocated for the length of the WPACKET */
        if ((pkt->curr - sub->lenbytes) == sub->packet_len) {
            pkt->written -= sub->lenbytes;
            pkt->curr -= sub->lenbytes;
        }

        /* Don't write out the packet length */
        sub->packet_len = 0;
        sub->lenbytes = 0;
    }

    /* Write out the WPACKET length if needed */
    if (sub->lenbytes > 0) {
        unsigned char *buf = GETBUF(pkt);

        if (buf != NULL
                && !put_value(&buf[sub->packet_len], packlen,
                              sub->lenbytes))
            return 0;
    }

    if (doclose) {
        pkt->subs = sub->parent;
        OPENSSL_free(sub);
    }

    return 1;
}

int WPACKET_fill_lengths(WPACKET *pkt)
{
    WPACKET_SUB *sub;

    if (!ossl_assert(pkt->subs != NULL))
        return 0;

    for (sub = pkt->subs; sub != NULL; sub = sub->parent) {
        if (!wpacket_intern_close(pkt, sub, 0))
            return 0;
    }

    return 1;
}

int WPACKET_close(WPACKET *pkt)
{
    /*
     * Internal API, so should not fail - but we do negative testing of this
     * so no assert (otherwise the tests fail)
     */
    if (pkt->subs == NULL || pkt->subs->parent == NULL)
        return 0;

    return wpacket_intern_close(pkt, pkt->subs, 1);
}

int WPACKET_finish(WPACKET *pkt)
{
    int ret;

    /*
     * Internal API, so should not fail - but we do negative testing of this
     * so no assert (otherwise the tests fail)
     */
    if (pkt->subs == NULL || pkt->subs->parent != NULL)
        return 0;

    ret = wpacket_intern_close(pkt, pkt->subs, 1);
    if (ret) {
        OPENSSL_free(pkt->subs);
        pkt->subs = NULL;
    }

    return ret;
}

int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes)
{
    WPACKET_SUB *sub;
    unsigned char *lenchars;

    /* Internal API, so should not fail */
    if (!ossl_assert(pkt->subs != NULL))
        return 0;

    if ((sub = OPENSSL_zalloc(sizeof(*sub))) == NULL) {
        SSLerr(SSL_F_WPACKET_START_SUB_PACKET_LEN__, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    sub->parent = pkt->subs;
    pkt->subs = sub;
    sub->pwritten = pkt->written + lenbytes;
    sub->lenbytes = lenbytes;

    if (lenbytes == 0) {
        sub->packet_len = 0;
        return 1;
    }

    sub->packet_len = pkt->written;

    if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars))
        return 0;

    return 1;
}

int WPACKET_start_sub_packet(WPACKET *pkt)
{
    return WPACKET_start_sub_packet_len__(pkt, 0);
}

int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t size)
{
    unsigned char *data;

    /* Internal API, so should not fail */
    if (!ossl_assert(size <= sizeof(unsigned int))
            || !WPACKET_allocate_bytes(pkt, size, &data)
            || !put_value(data, val, size))
        return 0;

    return 1;
}

int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize)
{
    WPACKET_SUB *sub;
    size_t lenbytes;

    /* Internal API, so should not fail */
    if (!ossl_assert(pkt->subs != NULL))
        return 0;

    /* Find the WPACKET_SUB for the top level */
    for (sub = pkt->subs; sub->parent != NULL; sub = sub->parent)
        continue;

    lenbytes = sub->lenbytes;
    if (lenbytes == 0)
        lenbytes = sizeof(pkt->maxsize);

    if (maxmaxsize(lenbytes) < maxsize || maxsize < pkt->written)
        return 0;

    pkt->maxsize = maxsize;

    return 1;
}

int WPACKET_memset(WPACKET *pkt, int ch, size_t len)
{
    unsigned char *dest;

    if (len == 0)
        return 1;

    if (!WPACKET_allocate_bytes(pkt, len, &dest))
        return 0;

    if (dest != NULL)
        memset(dest, ch, len);

    return 1;
}

int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len)
{
    unsigned char *dest;

    if (len == 0)
        return 1;

    if (!WPACKET_allocate_bytes(pkt, len, &dest))
        return 0;

    if (dest != NULL)
        memcpy(dest, src, len);

    return 1;
}

int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len,
                         size_t lenbytes)
{
    if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
            || !WPACKET_memcpy(pkt, src, len)
            || !WPACKET_close(pkt))
        return 0;

    return 1;
}

int WPACKET_get_total_written(WPACKET *pkt, size_t *written)
{
    /* Internal API, so should not fail */
    if (!ossl_assert(written != NULL))
        return 0;

    *written = pkt->written;

    return 1;
}

int WPACKET_get_length(WPACKET *pkt, size_t *len)
{
    /* Internal API, so should not fail */
    if (!ossl_assert(pkt->subs != NULL && len != NULL))
        return 0;

    *len = pkt->written - pkt->subs->pwritten;

    return 1;
}

unsigned char *WPACKET_get_curr(WPACKET *pkt)
{
    unsigned char *buf = GETBUF(pkt);

    if (buf == NULL)
        return NULL;

    return buf + pkt->curr;
}

int WPACKET_is_null_buf(WPACKET *pkt)
{
    return pkt->buf == NULL && pkt->staticbuf == NULL;
}

void WPACKET_cleanup(WPACKET *pkt)
{
    WPACKET_SUB *sub, *parent;

    for (sub = pkt->subs; sub != NULL; sub = parent) {
        parent = sub->parent;
        OPENSSL_free(sub);
    }
    pkt->subs = NULL;
}

Coverage Report

Created: 2024-08-17 06:46

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include "internal/cryptlib.h"
11		#include "internal/packet.h"
12		#include <openssl/sslerr.h>
13
14	0	#define DEFAULT_BUF_SIZE 256
15
16		int WPACKET_allocate_bytes(WPACKET pkt, size_t len, unsigned char *allocbytes)
17	0	{
18	0	if (!WPACKET_reserve_bytes(pkt, len, allocbytes))
19	0	return 0;
20
21	0	pkt->written += len;
22	0	pkt->curr += len;
23	0	return 1;
24	0	}
25
26		int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len,
27		unsigned char **allocbytes, size_t lenbytes)
28	0	{
29	0	if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
30	0	\|\| !WPACKET_allocate_bytes(pkt, len, allocbytes)
31	0	\|\| !WPACKET_close(pkt))
32	0	return 0;
33
34	0	return 1;
35	0	}
36
37	0	#define GETBUF(p) (((p)->staticbuf != NULL) \
38	0	? (p)->staticbuf \
39	0	: ((p)->buf != NULL \
40	0	? (unsigned char *)(p)->buf->data \
41	0	: NULL))
42
43		int WPACKET_reserve_bytes(WPACKET pkt, size_t len, unsigned char *allocbytes)
44	0	{
45		/* Internal API, so should not fail */
46	0	if (!ossl_assert(pkt->subs != NULL && len != 0))
47	0	return 0;
48
49	0	if (pkt->maxsize - pkt->written < len)
50	0	return 0;
51
52	0	if (pkt->buf != NULL && (pkt->buf->length - pkt->written < len)) {
53	0	size_t newlen;
54	0	size_t reflen;
55
56	0	reflen = (len > pkt->buf->length) ? len : pkt->buf->length;
57
58	0	if (reflen > SIZE_MAX / 2) {
59	0	newlen = SIZE_MAX;
60	0	} else {
61	0	newlen = reflen * 2;
62	0	if (newlen < DEFAULT_BUF_SIZE)
63	0	newlen = DEFAULT_BUF_SIZE;
64	0	}
65	0	if (BUF_MEM_grow(pkt->buf, newlen) == 0)
66	0	return 0;
67	0	}
68	0	if (allocbytes != NULL)
69	0	*allocbytes = WPACKET_get_curr(pkt);
70
71	0	return 1;
72	0	}
73
74		int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len,
75		unsigned char **allocbytes, size_t lenbytes)
76	0	{
77	0	if (!WPACKET_reserve_bytes(pkt, lenbytes + len, allocbytes))
78	0	return 0;
79
80	0	if (*allocbytes != NULL)
81	0	*allocbytes += lenbytes;
82
83	0	return 1;
84	0	}
85
86		static size_t maxmaxsize(size_t lenbytes)
87	0	{
88	0	if (lenbytes >= sizeof(size_t) \|\| lenbytes == 0)
89	0	return SIZE_MAX;
90
91	0	return ((size_t)1 << (lenbytes * 8)) - 1 + lenbytes;
92	0	}
93
94		static int wpacket_intern_init_len(WPACKET *pkt, size_t lenbytes)
95	0	{
96	0	unsigned char *lenchars;
97
98	0	pkt->curr = 0;
99	0	pkt->written = 0;
100
101	0	if ((pkt->subs = OPENSSL_zalloc(sizeof(*pkt->subs))) == NULL) {
102	0	SSLerr(SSL_F_WPACKET_INTERN_INIT_LEN, ERR_R_MALLOC_FAILURE);
103	0	return 0;
104	0	}
105
106	0	if (lenbytes == 0)
107	0	return 1;
108
109	0	pkt->subs->pwritten = lenbytes;
110	0	pkt->subs->lenbytes = lenbytes;
111
112	0	if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) {
113	0	OPENSSL_free(pkt->subs);
114	0	pkt->subs = NULL;
115	0	return 0;
116	0	}
117	0	pkt->subs->packet_len = 0;
118
119	0	return 1;
120	0	}
121
122		int WPACKET_init_static_len(WPACKET pkt, unsigned char buf, size_t len,
123		size_t lenbytes)
124	0	{
125	0	size_t max = maxmaxsize(lenbytes);
126
127		/* Internal API, so should not fail */
128	0	if (!ossl_assert(buf != NULL && len > 0))
129	0	return 0;
130
131	0	pkt->staticbuf = buf;
132	0	pkt->buf = NULL;
133	0	pkt->maxsize = (max < len) ? max : len;
134
135	0	return wpacket_intern_init_len(pkt, lenbytes);
136	0	}
137
138		int WPACKET_init_len(WPACKET pkt, BUF_MEM buf, size_t lenbytes)
139	0	{
140		/* Internal API, so should not fail */
141	0	if (!ossl_assert(buf != NULL))
142	0	return 0;
143
144	0	pkt->staticbuf = NULL;
145	0	pkt->buf = buf;
146	0	pkt->maxsize = maxmaxsize(lenbytes);
147
148	0	return wpacket_intern_init_len(pkt, lenbytes);
149	0	}
150
151		int WPACKET_init(WPACKET pkt, BUF_MEM buf)
152	0	{
153	0	return WPACKET_init_len(pkt, buf, 0);
154	0	}
155
156		int WPACKET_init_null(WPACKET *pkt, size_t lenbytes)
157	0	{
158	0	pkt->staticbuf = NULL;
159	0	pkt->buf = NULL;
160	0	pkt->maxsize = maxmaxsize(lenbytes);
161
162	0	return wpacket_intern_init_len(pkt, 0);
163	0	}
164
165		int WPACKET_set_flags(WPACKET *pkt, unsigned int flags)
166	0	{
167		/* Internal API, so should not fail */
168	0	if (!ossl_assert(pkt->subs != NULL))
169	0	return 0;
170
171	0	pkt->subs->flags = flags;
172
173	0	return 1;
174	0	}
175
176		/* Store the \|value\| of length \|len\| at location \|data\| */
177		static int put_value(unsigned char *data, size_t value, size_t len)
178	0	{
179	0	if (data == NULL)
180	0	return 1;
181
182	0	for (data += len - 1; len > 0; len--) {
183	0	*data = (unsigned char)(value & 0xff);
184	0	data--;
185	0	value >>= 8;
186	0	}
187
188		/* Check whether we could fit the value in the assigned number of bytes */
189	0	if (value > 0)
190	0	return 0;
191
192	0	return 1;
193	0	}
194
195
196		/*
197		* Internal helper function used by WPACKET_close(), WPACKET_finish() and
198		* WPACKET_fill_lengths() to close a sub-packet and write out its length if
199		* necessary. If \|doclose\| is 0 then it goes through the motions of closing
200		* (i.e. it fills in all the lengths), but doesn't actually close anything.
201		*/
202		static int wpacket_intern_close(WPACKET pkt, WPACKET_SUB sub, int doclose)
203	0	{
204	0	size_t packlen = pkt->written - sub->pwritten;
205
206	0	if (packlen == 0
207	0	&& (sub->flags & WPACKET_FLAGS_NON_ZERO_LENGTH) != 0)
208	0	return 0;
209
210	0	if (packlen == 0
211	0	&& sub->flags & WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH) {
212		/* We can't handle this case. Return an error */
213	0	if (!doclose)
214	0	return 0;
215
216		/* Deallocate any bytes allocated for the length of the WPACKET */
217	0	if ((pkt->curr - sub->lenbytes) == sub->packet_len) {
218	0	pkt->written -= sub->lenbytes;
219	0	pkt->curr -= sub->lenbytes;
220	0	}
221
222		/* Don't write out the packet length */
223	0	sub->packet_len = 0;
224	0	sub->lenbytes = 0;
225	0	}
226
227		/* Write out the WPACKET length if needed */
228	0	if (sub->lenbytes > 0) {
229	0	unsigned char *buf = GETBUF(pkt);
230
231	0	if (buf != NULL
232	0	&& !put_value(&buf[sub->packet_len], packlen,
233	0	sub->lenbytes))
234	0	return 0;
235	0	}
236
237	0	if (doclose) {
238	0	pkt->subs = sub->parent;
239	0	OPENSSL_free(sub);
240	0	}
241
242	0	return 1;
243	0	}
244
245		int WPACKET_fill_lengths(WPACKET *pkt)
246	0	{
247	0	WPACKET_SUB *sub;
248
249	0	if (!ossl_assert(pkt->subs != NULL))
250	0	return 0;
251
252	0	for (sub = pkt->subs; sub != NULL; sub = sub->parent) {
253	0	if (!wpacket_intern_close(pkt, sub, 0))
254	0	return 0;
255	0	}
256
257	0	return 1;
258	0	}
259
260		int WPACKET_close(WPACKET *pkt)
261	0	{
262		/*
263		* Internal API, so should not fail - but we do negative testing of this
264		* so no assert (otherwise the tests fail)
265		*/
266	0	if (pkt->subs == NULL \|\| pkt->subs->parent == NULL)
267	0	return 0;
268
269	0	return wpacket_intern_close(pkt, pkt->subs, 1);
270	0	}
271
272		int WPACKET_finish(WPACKET *pkt)
273	0	{
274	0	int ret;
275
276		/*
277		* Internal API, so should not fail - but we do negative testing of this
278		* so no assert (otherwise the tests fail)
279		*/
280	0	if (pkt->subs == NULL \|\| pkt->subs->parent != NULL)
281	0	return 0;
282
283	0	ret = wpacket_intern_close(pkt, pkt->subs, 1);
284	0	if (ret) {
285	0	OPENSSL_free(pkt->subs);
286	0	pkt->subs = NULL;
287	0	}
288
289	0	return ret;
290	0	}
291
292		int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes)
293	0	{
294	0	WPACKET_SUB *sub;
295	0	unsigned char *lenchars;
296
297		/* Internal API, so should not fail */
298	0	if (!ossl_assert(pkt->subs != NULL))
299	0	return 0;
300
301	0	if ((sub = OPENSSL_zalloc(sizeof(*sub))) == NULL) {
302	0	SSLerr(SSL_F_WPACKET_START_SUB_PACKET_LEN__, ERR_R_MALLOC_FAILURE);
303	0	return 0;
304	0	}
305
306	0	sub->parent = pkt->subs;
307	0	pkt->subs = sub;
308	0	sub->pwritten = pkt->written + lenbytes;
309	0	sub->lenbytes = lenbytes;
310
311	0	if (lenbytes == 0) {
312	0	sub->packet_len = 0;
313	0	return 1;
314	0	}
315
316	0	sub->packet_len = pkt->written;
317
318	0	if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars))
319	0	return 0;
320
321	0	return 1;
322	0	}
323
324		int WPACKET_start_sub_packet(WPACKET *pkt)
325	0	{
326	0	return WPACKET_start_sub_packet_len__(pkt, 0);
327	0	}
328
329		int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t size)
330	0	{
331	0	unsigned char *data;
332
333		/* Internal API, so should not fail */
334	0	if (!ossl_assert(size <= sizeof(unsigned int))
335	0	\|\| !WPACKET_allocate_bytes(pkt, size, &data)
336	0	\|\| !put_value(data, val, size))
337	0	return 0;
338
339	0	return 1;
340	0	}
341
342		int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize)
343	0	{
344	0	WPACKET_SUB *sub;
345	0	size_t lenbytes;
346
347		/* Internal API, so should not fail */
348	0	if (!ossl_assert(pkt->subs != NULL))
349	0	return 0;
350
351		/* Find the WPACKET_SUB for the top level */
352	0	for (sub = pkt->subs; sub->parent != NULL; sub = sub->parent)
353	0	continue;
354
355	0	lenbytes = sub->lenbytes;
356	0	if (lenbytes == 0)
357	0	lenbytes = sizeof(pkt->maxsize);
358
359	0	if (maxmaxsize(lenbytes) < maxsize \|\| maxsize < pkt->written)
360	0	return 0;
361
362	0	pkt->maxsize = maxsize;
363
364	0	return 1;
365	0	}
366
367		int WPACKET_memset(WPACKET *pkt, int ch, size_t len)
368	0	{
369	0	unsigned char *dest;
370
371	0	if (len == 0)
372	0	return 1;
373
374	0	if (!WPACKET_allocate_bytes(pkt, len, &dest))
375	0	return 0;
376
377	0	if (dest != NULL)
378	0	memset(dest, ch, len);
379
380	0	return 1;
381	0	}
382
383		int WPACKET_memcpy(WPACKET pkt, const void src, size_t len)
384	0	{
385	0	unsigned char *dest;
386
387	0	if (len == 0)
388	0	return 1;
389
390	0	if (!WPACKET_allocate_bytes(pkt, len, &dest))
391	0	return 0;
392
393	0	if (dest != NULL)
394	0	memcpy(dest, src, len);
395
396	0	return 1;
397	0	}
398
399		int WPACKET_sub_memcpy__(WPACKET pkt, const void src, size_t len,
400		size_t lenbytes)
401	0	{
402	0	if (!WPACKET_start_sub_packet_len__(pkt, lenbytes)
403	0	\|\| !WPACKET_memcpy(pkt, src, len)
404	0	\|\| !WPACKET_close(pkt))
405	0	return 0;
406
407	0	return 1;
408	0	}
409
410		int WPACKET_get_total_written(WPACKET pkt, size_t written)
411	0	{
412		/* Internal API, so should not fail */
413	0	if (!ossl_assert(written != NULL))
414	0	return 0;
415
416	0	*written = pkt->written;
417
418	0	return 1;
419	0	}
420
421		int WPACKET_get_length(WPACKET pkt, size_t len)
422	0	{
423		/* Internal API, so should not fail */
424	0	if (!ossl_assert(pkt->subs != NULL && len != NULL))
425	0	return 0;
426
427	0	*len = pkt->written - pkt->subs->pwritten;
428
429	0	return 1;
430	0	}
431
432		unsigned char WPACKET_get_curr(WPACKET pkt)
433	0	{
434	0	unsigned char *buf = GETBUF(pkt);
435
436	0	if (buf == NULL)
437	0	return NULL;
438
439	0	return buf + pkt->curr;
440	0	}
441
442		int WPACKET_is_null_buf(WPACKET *pkt)
443	0	{
444	0	return pkt->buf == NULL && pkt->staticbuf == NULL;
445	0	}
446
447		void WPACKET_cleanup(WPACKET *pkt)
448	0	{
449	0	WPACKET_SUB sub, parent;
450
451	0	for (sub = pkt->subs; sub != NULL; sub = parent) {
452	0	parent = sub->parent;
453	0	OPENSSL_free(sub);
454	0	}
455	0	pkt->subs = NULL;
456	0	}