/src/openssl/crypto/asn1/bio_asn1.c

Source (jump to first uncovered line)
/*
 * Copyright 2006-2018 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
 */

/*
 * Experimental ASN1 BIO. When written through the data is converted to an
 * ASN1 string type: default is OCTET STRING. Additional functions can be
 * provided to add prefix and suffix data.
 */

#include <string.h>
#include "internal/bio.h"
#include <openssl/asn1.h>
#include "internal/cryptlib.h"

/* Must be large enough for biggest tag+length */
#define DEFAULT_ASN1_BUF_SIZE 20

typedef enum {
    ASN1_STATE_START,
    ASN1_STATE_PRE_COPY,
    ASN1_STATE_HEADER,
    ASN1_STATE_HEADER_COPY,
    ASN1_STATE_DATA_COPY,
    ASN1_STATE_POST_COPY,
    ASN1_STATE_DONE
} asn1_bio_state_t;

typedef struct BIO_ASN1_EX_FUNCS_st {
    asn1_ps_func *ex_func;
    asn1_ps_func *ex_free_func;
} BIO_ASN1_EX_FUNCS;

typedef struct BIO_ASN1_BUF_CTX_t {
    /* Internal state */
    asn1_bio_state_t state;
    /* Internal buffer */
    unsigned char *buf;
    /* Size of buffer */
    int bufsize;
    /* Current position in buffer */
    int bufpos;
    /* Current buffer length */
    int buflen;
    /* Amount of data to copy */
    int copylen;
    /* Class and tag to use */
    int asn1_class, asn1_tag;
    asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
    /* Extra buffer for prefix and suffix data */
    unsigned char *ex_buf;
    int ex_len;
    int ex_pos;
    void *ex_arg;
} BIO_ASN1_BUF_CTX;

static int asn1_bio_write(BIO *h, const char *buf, int num);
static int asn1_bio_read(BIO *h, char *buf, int size);
static int asn1_bio_puts(BIO *h, const char *str);
static int asn1_bio_gets(BIO *h, char *str, int size);
static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int asn1_bio_new(BIO *h);
static int asn1_bio_free(BIO *data);
static long asn1_bio_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);

static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
                             asn1_ps_func *cleanup, asn1_bio_state_t next);
static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
                             asn1_ps_func *setup,
                             asn1_bio_state_t ex_state,
                             asn1_bio_state_t other_state);

static const BIO_METHOD methods_asn1 = {
    BIO_TYPE_ASN1,
    "asn1",
    /* TODO: Convert to new style write function */
    bwrite_conv,
    asn1_bio_write,
    /* TODO: Convert to new style read function */
    bread_conv,
    asn1_bio_read,
    asn1_bio_puts,
    asn1_bio_gets,
    asn1_bio_ctrl,
    asn1_bio_new,
    asn1_bio_free,
    asn1_bio_callback_ctrl,
};

const BIO_METHOD *BIO_f_asn1(void)
{
    return &methods_asn1;
}

static int asn1_bio_new(BIO *b)
{
    BIO_ASN1_BUF_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx == NULL)
        return 0;
    if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
        OPENSSL_free(ctx);
        return 0;
    }
    BIO_set_data(b, ctx);
    BIO_set_init(b, 1);

    return 1;
}

static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
{
    if ((ctx->buf = OPENSSL_malloc(size)) == NULL) {
        ASN1err(ASN1_F_ASN1_BIO_INIT, ERR_R_MALLOC_FAILURE);
        return 0;
    }
    ctx->bufsize = size;
    ctx->asn1_class = V_ASN1_UNIVERSAL;
    ctx->asn1_tag = V_ASN1_OCTET_STRING;
    ctx->state = ASN1_STATE_START;
    return 1;
}

static int asn1_bio_free(BIO *b)
{
    BIO_ASN1_BUF_CTX *ctx;

    if (b == NULL)
        return 0;

    ctx = BIO_get_data(b);
    if (ctx == NULL)
        return 0;

    OPENSSL_free(ctx->buf);
    OPENSSL_free(ctx);
    BIO_set_data(b, NULL);
    BIO_set_init(b, 0);

    return 1;
}

static int asn1_bio_write(BIO *b, const char *in, int inl)
{
    BIO_ASN1_BUF_CTX *ctx;
    int wrmax, wrlen, ret;
    unsigned char *p;
    BIO *next;

    ctx = BIO_get_data(b);
    next = BIO_next(b);
    if (in == NULL || inl < 0 || ctx == NULL || next == NULL)
        return 0;

    wrlen = 0;
    ret = -1;

    for (;;) {
        switch (ctx->state) {
            /* Setup prefix data, call it */
        case ASN1_STATE_START:
            if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
                                   ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
                return 0;
            break;

            /* Copy any pre data first */
        case ASN1_STATE_PRE_COPY:

            ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
                                    ASN1_STATE_HEADER);

            if (ret <= 0)
                goto done;

            break;

        case ASN1_STATE_HEADER:
            ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
            if (!ossl_assert(ctx->buflen <= ctx->bufsize))
                return 0;
            p = ctx->buf;
            ASN1_put_object(&p, 0, inl, ctx->asn1_tag, ctx->asn1_class);
            ctx->copylen = inl;
            ctx->state = ASN1_STATE_HEADER_COPY;

            break;

        case ASN1_STATE_HEADER_COPY:
            ret = BIO_write(next, ctx->buf + ctx->bufpos, ctx->buflen);
            if (ret <= 0)
                goto done;

            ctx->buflen -= ret;
            if (ctx->buflen)
                ctx->bufpos += ret;
            else {
                ctx->bufpos = 0;
                ctx->state = ASN1_STATE_DATA_COPY;
            }

            break;

        case ASN1_STATE_DATA_COPY:

            if (inl > ctx->copylen)
                wrmax = ctx->copylen;
            else
                wrmax = inl;
            ret = BIO_write(next, in, wrmax);
            if (ret <= 0)
                goto done;
            wrlen += ret;
            ctx->copylen -= ret;
            in += ret;
            inl -= ret;

            if (ctx->copylen == 0)
                ctx->state = ASN1_STATE_HEADER;

            if (inl == 0)
                goto done;

            break;

        case ASN1_STATE_POST_COPY:
        case ASN1_STATE_DONE:
            BIO_clear_retry_flags(b);
            return 0;

        }

    }

 done:
    BIO_clear_retry_flags(b);
    BIO_copy_next_retry(b);

    return (wrlen > 0) ? wrlen : ret;

}

static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
                             asn1_ps_func *cleanup, asn1_bio_state_t next)
{
    int ret;

    if (ctx->ex_len <= 0)
        return 1;
    for (;;) {
        ret = BIO_write(BIO_next(b), ctx->ex_buf + ctx->ex_pos, ctx->ex_len);
        if (ret <= 0)
            break;
        ctx->ex_len -= ret;
        if (ctx->ex_len > 0)
            ctx->ex_pos += ret;
        else {
            if (cleanup)
                cleanup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
            ctx->state = next;
            ctx->ex_pos = 0;
            break;
        }
    }
    return ret;
}

static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
                             asn1_ps_func *setup,
                             asn1_bio_state_t ex_state,
                             asn1_bio_state_t other_state)
{
    if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) {
        BIO_clear_retry_flags(b);
        return 0;
    }
    if (ctx->ex_len > 0)
        ctx->state = ex_state;
    else
        ctx->state = other_state;
    return 1;
}

static int asn1_bio_read(BIO *b, char *in, int inl)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_read(next, in, inl);
}

static int asn1_bio_puts(BIO *b, const char *str)
{
    return asn1_bio_write(b, str, strlen(str));
}

static int asn1_bio_gets(BIO *b, char *str, int size)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_gets(next, str, size);
}

static long asn1_bio_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_callback_ctrl(next, cmd, fp);
}

static long asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
{
    BIO_ASN1_BUF_CTX *ctx;
    BIO_ASN1_EX_FUNCS *ex_func;
    long ret = 1;
    BIO *next;

    ctx = BIO_get_data(b);
    if (ctx == NULL)
        return 0;
    next = BIO_next(b);
    switch (cmd) {

    case BIO_C_SET_PREFIX:
        ex_func = arg2;
        ctx->prefix = ex_func->ex_func;
        ctx->prefix_free = ex_func->ex_free_func;
        break;

    case BIO_C_GET_PREFIX:
        ex_func = arg2;
        ex_func->ex_func = ctx->prefix;
        ex_func->ex_free_func = ctx->prefix_free;
        break;

    case BIO_C_SET_SUFFIX:
        ex_func = arg2;
        ctx->suffix = ex_func->ex_func;
        ctx->suffix_free = ex_func->ex_free_func;
        break;

    case BIO_C_GET_SUFFIX:
        ex_func = arg2;
        ex_func->ex_func = ctx->suffix;
        ex_func->ex_free_func = ctx->suffix_free;
        break;

    case BIO_C_SET_EX_ARG:
        ctx->ex_arg = arg2;
        break;

    case BIO_C_GET_EX_ARG:
        *(void **)arg2 = ctx->ex_arg;
        break;

    case BIO_CTRL_FLUSH:
        if (next == NULL)
            return 0;

        /* Call post function if possible */
        if (ctx->state == ASN1_STATE_HEADER) {
            if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
                                   ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
                return 0;
        }

        if (ctx->state == ASN1_STATE_POST_COPY) {
            ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
                                    ASN1_STATE_DONE);
            if (ret <= 0)
                return ret;
        }

        if (ctx->state == ASN1_STATE_DONE)
            return BIO_ctrl(next, cmd, arg1, arg2);
        else {
            BIO_clear_retry_flags(b);
            return 0;
        }

    default:
        if (next == NULL)
            return 0;
        return BIO_ctrl(next, cmd, arg1, arg2);

    }

    return ret;
}

static int asn1_bio_set_ex(BIO *b, int cmd,
                           asn1_ps_func *ex_func, asn1_ps_func *ex_free_func)
{
    BIO_ASN1_EX_FUNCS extmp;
    extmp.ex_func = ex_func;
    extmp.ex_free_func = ex_free_func;
    return BIO_ctrl(b, cmd, 0, &extmp);
}

static int asn1_bio_get_ex(BIO *b, int cmd,
                           asn1_ps_func **ex_func,
                           asn1_ps_func **ex_free_func)
{
    BIO_ASN1_EX_FUNCS extmp;
    int ret;
    ret = BIO_ctrl(b, cmd, 0, &extmp);
    if (ret > 0) {
        *ex_func = extmp.ex_func;
        *ex_free_func = extmp.ex_free_func;
    }
    return ret;
}

int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix,
                        asn1_ps_func *prefix_free)
{
    return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
}

int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix,
                        asn1_ps_func **pprefix_free)
{
    return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
}

int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix,
                        asn1_ps_func *suffix_free)
{
    return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
}

int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix,
                        asn1_ps_func **psuffix_free)
{
    return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
}

Coverage Report

Created: 2018-08-29 13:53

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the OpenSSL license (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		/*
11		* Experimental ASN1 BIO. When written through the data is converted to an
12		* ASN1 string type: default is OCTET STRING. Additional functions can be
13		* provided to add prefix and suffix data.
14		*/
15
16		#include <string.h>
17		#include "internal/bio.h"
18		#include <openssl/asn1.h>
19		#include "internal/cryptlib.h"
20
21		/* Must be large enough for biggest tag+length */
22	0	#define DEFAULT_ASN1_BUF_SIZE 20
23
24		typedef enum {
25		ASN1_STATE_START,
26		ASN1_STATE_PRE_COPY,
27		ASN1_STATE_HEADER,
28		ASN1_STATE_HEADER_COPY,
29		ASN1_STATE_DATA_COPY,
30		ASN1_STATE_POST_COPY,
31		ASN1_STATE_DONE
32		} asn1_bio_state_t;
33
34		typedef struct BIO_ASN1_EX_FUNCS_st {
35		asn1_ps_func *ex_func;
36		asn1_ps_func *ex_free_func;
37		} BIO_ASN1_EX_FUNCS;
38
39		typedef struct BIO_ASN1_BUF_CTX_t {
40		/* Internal state */
41		asn1_bio_state_t state;
42		/* Internal buffer */
43		unsigned char *buf;
44		/* Size of buffer */
45		int bufsize;
46		/* Current position in buffer */
47		int bufpos;
48		/* Current buffer length */
49		int buflen;
50		/* Amount of data to copy */
51		int copylen;
52		/* Class and tag to use */
53		int asn1_class, asn1_tag;
54		asn1_ps_func prefix, prefix_free, suffix, suffix_free;
55		/* Extra buffer for prefix and suffix data */
56		unsigned char *ex_buf;
57		int ex_len;
58		int ex_pos;
59		void *ex_arg;
60		} BIO_ASN1_BUF_CTX;
61
62		static int asn1_bio_write(BIO h, const char buf, int num);
63		static int asn1_bio_read(BIO h, char buf, int size);
64		static int asn1_bio_puts(BIO h, const char str);
65		static int asn1_bio_gets(BIO h, char str, int size);
66		static long asn1_bio_ctrl(BIO h, int cmd, long arg1, void arg2);
67		static int asn1_bio_new(BIO *h);
68		static int asn1_bio_free(BIO *data);
69		static long asn1_bio_callback_ctrl(BIO h, int cmd, BIO_info_cb fp);
70
71		static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
72		static int asn1_bio_flush_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
73		asn1_ps_func *cleanup, asn1_bio_state_t next);
74		static int asn1_bio_setup_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
75		asn1_ps_func *setup,
76		asn1_bio_state_t ex_state,
77		asn1_bio_state_t other_state);
78
79		static const BIO_METHOD methods_asn1 = {
80		BIO_TYPE_ASN1,
81		"asn1",
82		/* TODO: Convert to new style write function */
83		bwrite_conv,
84		asn1_bio_write,
85		/* TODO: Convert to new style read function */
86		bread_conv,
87		asn1_bio_read,
88		asn1_bio_puts,
89		asn1_bio_gets,
90		asn1_bio_ctrl,
91		asn1_bio_new,
92		asn1_bio_free,
93		asn1_bio_callback_ctrl,
94		};
95
96		const BIO_METHOD *BIO_f_asn1(void)
97	0	{
98	0	return &methods_asn1;
99	0	}
100
101		static int asn1_bio_new(BIO *b)
102	0	{
103	0	BIO_ASN1_BUF_CTX ctx = OPENSSL_zalloc(sizeof(ctx));
104	0
105	0	if (ctx == NULL)
106	0	return 0;
107	0	if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
108	0	OPENSSL_free(ctx);
109	0	return 0;
110	0	}
111	0	BIO_set_data(b, ctx);
112	0	BIO_set_init(b, 1);
113	0
114	0	return 1;
115	0	}
116
117		static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
118	0	{
119	0	if ((ctx->buf = OPENSSL_malloc(size)) == NULL) {
120	0	ASN1err(ASN1_F_ASN1_BIO_INIT, ERR_R_MALLOC_FAILURE);
121	0	return 0;
122	0	}
123	0	ctx->bufsize = size;
124	0	ctx->asn1_class = V_ASN1_UNIVERSAL;
125	0	ctx->asn1_tag = V_ASN1_OCTET_STRING;
126	0	ctx->state = ASN1_STATE_START;
127	0	return 1;
128	0	}
129
130		static int asn1_bio_free(BIO *b)
131	0	{
132	0	BIO_ASN1_BUF_CTX *ctx;
133	0
134	0	if (b == NULL)
135	0	return 0;
136	0
137	0	ctx = BIO_get_data(b);
138	0	if (ctx == NULL)
139	0	return 0;
140	0
141	0	OPENSSL_free(ctx->buf);
142	0	OPENSSL_free(ctx);
143	0	BIO_set_data(b, NULL);
144	0	BIO_set_init(b, 0);
145	0
146	0	return 1;
147	0	}
148
149		static int asn1_bio_write(BIO b, const char in, int inl)
150	0	{
151	0	BIO_ASN1_BUF_CTX *ctx;
152	0	int wrmax, wrlen, ret;
153	0	unsigned char *p;
154	0	BIO *next;
155	0
156	0	ctx = BIO_get_data(b);
157	0	next = BIO_next(b);
158	0	if (in == NULL \|\| inl < 0 \|\| ctx == NULL \|\| next == NULL)
159	0	return 0;
160	0
161	0	wrlen = 0;
162	0	ret = -1;
163	0
164	0	for (;;) {
165	0	switch (ctx->state) {
166	0	/* Setup prefix data, call it */
167	0	case ASN1_STATE_START:
168	0	if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
169	0	ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
170	0	return 0;
171	0	break;
172	0
173	0	/* Copy any pre data first */
174	0	case ASN1_STATE_PRE_COPY:
175	0
176	0	ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
177	0	ASN1_STATE_HEADER);
178	0
179	0	if (ret <= 0)
180	0	goto done;
181	0
182	0	break;
183	0
184	0	case ASN1_STATE_HEADER:
185	0	ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
186	0	if (!ossl_assert(ctx->buflen <= ctx->bufsize))
187	0	return 0;
188	0	p = ctx->buf;
189	0	ASN1_put_object(&p, 0, inl, ctx->asn1_tag, ctx->asn1_class);
190	0	ctx->copylen = inl;
191	0	ctx->state = ASN1_STATE_HEADER_COPY;
192	0
193	0	break;
194	0
195	0	case ASN1_STATE_HEADER_COPY:
196	0	ret = BIO_write(next, ctx->buf + ctx->bufpos, ctx->buflen);
197	0	if (ret <= 0)
198	0	goto done;
199	0
200	0	ctx->buflen -= ret;
201	0	if (ctx->buflen)
202	0	ctx->bufpos += ret;
203	0	else {
204	0	ctx->bufpos = 0;
205	0	ctx->state = ASN1_STATE_DATA_COPY;
206	0	}
207	0
208	0	break;
209	0
210	0	case ASN1_STATE_DATA_COPY:
211	0
212	0	if (inl > ctx->copylen)
213	0	wrmax = ctx->copylen;
214	0	else
215	0	wrmax = inl;
216	0	ret = BIO_write(next, in, wrmax);
217	0	if (ret <= 0)
218	0	goto done;
219	0	wrlen += ret;
220	0	ctx->copylen -= ret;
221	0	in += ret;
222	0	inl -= ret;
223	0
224	0	if (ctx->copylen == 0)
225	0	ctx->state = ASN1_STATE_HEADER;
226	0
227	0	if (inl == 0)
228	0	goto done;
229	0
230	0	break;
231	0
232	0	case ASN1_STATE_POST_COPY:
233	0	case ASN1_STATE_DONE:
234	0	BIO_clear_retry_flags(b);
235	0	return 0;
236	0
237	0	}
238	0
239	0	}
240	0
241	0	done:
242	0	BIO_clear_retry_flags(b);
243	0	BIO_copy_next_retry(b);
244	0
245	0	return (wrlen > 0) ? wrlen : ret;
246	0
247	0	}
248
249		static int asn1_bio_flush_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
250		asn1_ps_func *cleanup, asn1_bio_state_t next)
251	0	{
252	0	int ret;
253	0
254	0	if (ctx->ex_len <= 0)
255	0	return 1;
256	0	for (;;) {
257	0	ret = BIO_write(BIO_next(b), ctx->ex_buf + ctx->ex_pos, ctx->ex_len);
258	0	if (ret <= 0)
259	0	break;
260	0	ctx->ex_len -= ret;
261	0	if (ctx->ex_len > 0)
262	0	ctx->ex_pos += ret;
263	0	else {
264	0	if (cleanup)
265	0	cleanup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
266	0	ctx->state = next;
267	0	ctx->ex_pos = 0;
268	0	break;
269	0	}
270	0	}
271	0	return ret;
272	0	}
273
274		static int asn1_bio_setup_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
275		asn1_ps_func *setup,
276		asn1_bio_state_t ex_state,
277		asn1_bio_state_t other_state)
278	0	{
279	0	if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) {
280	0	BIO_clear_retry_flags(b);
281	0	return 0;
282	0	}
283	0	if (ctx->ex_len > 0)
284	0	ctx->state = ex_state;
285	0	else
286	0	ctx->state = other_state;
287	0	return 1;
288	0	}
289
290		static int asn1_bio_read(BIO b, char in, int inl)
291	0	{
292	0	BIO *next = BIO_next(b);
293	0	if (next == NULL)
294	0	return 0;
295	0	return BIO_read(next, in, inl);
296	0	}
297
298		static int asn1_bio_puts(BIO b, const char str)
299	0	{
300	0	return asn1_bio_write(b, str, strlen(str));
301	0	}
302
303		static int asn1_bio_gets(BIO b, char str, int size)
304	0	{
305	0	BIO *next = BIO_next(b);
306	0	if (next == NULL)
307	0	return 0;
308	0	return BIO_gets(next, str, size);
309	0	}
310
311		static long asn1_bio_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
312	0	{
313	0	BIO *next = BIO_next(b);
314	0	if (next == NULL)
315	0	return 0;
316	0	return BIO_callback_ctrl(next, cmd, fp);
317	0	}
318
319		static long asn1_bio_ctrl(BIO b, int cmd, long arg1, void arg2)
320	0	{
321	0	BIO_ASN1_BUF_CTX *ctx;
322	0	BIO_ASN1_EX_FUNCS *ex_func;
323	0	long ret = 1;
324	0	BIO *next;
325	0
326	0	ctx = BIO_get_data(b);
327	0	if (ctx == NULL)
328	0	return 0;
329	0	next = BIO_next(b);
330	0	switch (cmd) {
331	0
332	0	case BIO_C_SET_PREFIX:
333	0	ex_func = arg2;
334	0	ctx->prefix = ex_func->ex_func;
335	0	ctx->prefix_free = ex_func->ex_free_func;
336	0	break;
337	0
338	0	case BIO_C_GET_PREFIX:
339	0	ex_func = arg2;
340	0	ex_func->ex_func = ctx->prefix;
341	0	ex_func->ex_free_func = ctx->prefix_free;
342	0	break;
343	0
344	0	case BIO_C_SET_SUFFIX:
345	0	ex_func = arg2;
346	0	ctx->suffix = ex_func->ex_func;
347	0	ctx->suffix_free = ex_func->ex_free_func;
348	0	break;
349	0
350	0	case BIO_C_GET_SUFFIX:
351	0	ex_func = arg2;
352	0	ex_func->ex_func = ctx->suffix;
353	0	ex_func->ex_free_func = ctx->suffix_free;
354	0	break;
355	0
356	0	case BIO_C_SET_EX_ARG:
357	0	ctx->ex_arg = arg2;
358	0	break;
359	0
360	0	case BIO_C_GET_EX_ARG:
361	0	(void *)arg2 = ctx->ex_arg;
362	0	break;
363	0
364	0	case BIO_CTRL_FLUSH:
365	0	if (next == NULL)
366	0	return 0;
367	0
368	0	/* Call post function if possible */
369	0	if (ctx->state == ASN1_STATE_HEADER) {
370	0	if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
371	0	ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
372	0	return 0;
373	0	}
374	0
375	0	if (ctx->state == ASN1_STATE_POST_COPY) {
376	0	ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
377	0	ASN1_STATE_DONE);
378	0	if (ret <= 0)
379	0	return ret;
380	0	}
381	0
382	0	if (ctx->state == ASN1_STATE_DONE)
383	0	return BIO_ctrl(next, cmd, arg1, arg2);
384	0	else {
385	0	BIO_clear_retry_flags(b);
386	0	return 0;
387	0	}
388	0
389	0	default:
390	0	if (next == NULL)
391	0	return 0;
392	0	return BIO_ctrl(next, cmd, arg1, arg2);
393	0
394	0	}
395	0
396	0	return ret;
397	0	}
398
399		static int asn1_bio_set_ex(BIO *b, int cmd,
400		asn1_ps_func ex_func, asn1_ps_func ex_free_func)
401	0	{
402	0	BIO_ASN1_EX_FUNCS extmp;
403	0	extmp.ex_func = ex_func;
404	0	extmp.ex_free_func = ex_free_func;
405	0	return BIO_ctrl(b, cmd, 0, &extmp);
406	0	}
407
408		static int asn1_bio_get_ex(BIO *b, int cmd,
409		asn1_ps_func **ex_func,
410		asn1_ps_func **ex_free_func)
411	0	{
412	0	BIO_ASN1_EX_FUNCS extmp;
413	0	int ret;
414	0	ret = BIO_ctrl(b, cmd, 0, &extmp);
415	0	if (ret > 0) {
416	0	*ex_func = extmp.ex_func;
417	0	*ex_free_func = extmp.ex_free_func;
418	0	}
419	0	return ret;
420	0	}
421
422		int BIO_asn1_set_prefix(BIO b, asn1_ps_func prefix,
423		asn1_ps_func *prefix_free)
424	0	{
425	0	return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
426	0	}
427
428		int BIO_asn1_get_prefix(BIO b, asn1_ps_func *pprefix,
429		asn1_ps_func **pprefix_free)
430	0	{
431	0	return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
432	0	}
433
434		int BIO_asn1_set_suffix(BIO b, asn1_ps_func suffix,
435		asn1_ps_func *suffix_free)
436	0	{
437	0	return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
438	0	}
439
440		int BIO_asn1_get_suffix(BIO b, asn1_ps_func *psuffix,
441		asn1_ps_func **psuffix_free)
442	0	{
443	0	return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
444	0	}