/* crypto/bio/bio_lib.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include <errno.h>

#include <openssl/crypto.h>

#include "cryptlib.h"

#include <openssl/bio.h>

#include <openssl/stack.h>

BIO *BIO_new(BIO_METHOD *method)

{

    BIO *ret = NULL;

    ret = (BIO *)OPENSSL_malloc(sizeof(BIO));

    if (ret == NULL) {

        BIOerr(BIO_F_BIO_NEW, ERR_R_MALLOC_FAILURE);

        return (NULL);

    }

    if (!BIO_set(ret, method)) {

        OPENSSL_free(ret);

        ret = NULL;

    }

    return (ret);

}

int BIO_set(BIO *bio, BIO_METHOD *method)

{

    bio->method = method;

    bio->callback = NULL;

    bio->cb_arg = NULL;

    bio->init = 0;

    bio->shutdown = 1;

    bio->flags = 0;

    bio->retry_reason = 0;

    bio->num = 0;

    bio->ptr = NULL;

    bio->prev_bio = NULL;

    bio->next_bio = NULL;

    bio->references = 1;

    bio->num_read = 0L;

    bio->num_write = 0L;

    CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);

    if (method->create != NULL)

        if (!method->create(bio)) {

            CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);

            return (0);

        }

    return (1);

}

int BIO_free(BIO *a)

{

    int i;

    if (a == NULL)

        return (0);

    i = CRYPTO_add(&a->references, -1, CRYPTO_LOCK_BIO);

#ifdef REF_PRINT

    REF_PRINT("BIO", a);

#endif

    if (i > 0)

        return (1);

#ifdef REF_CHECK

    if (i < 0) {

        fprintf(stderr, "BIO_free, bad reference count\n");

        abort();

    }

#endif

    if ((a->callback != NULL) &&

        ((i = (int)a->callback(a, BIO_CB_FREE, NULL, 0, 0L, 1L)) <= 0))

        return (i);

    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);

    if ((a->method != NULL) && (a->method->destroy != NULL))

        a->method->destroy(a);

    OPENSSL_free(a);

    return (1);

}

void BIO_vfree(BIO *a)

{

    BIO_free(a);

}

void BIO_clear_flags(BIO *b, int flags)

{

    b->flags &= ~flags;

}

int BIO_test_flags(const BIO *b, int flags)

{

    return (b->flags & flags);

}

void BIO_set_flags(BIO *b, int flags)

{

    b->flags |= flags;

}

long (*BIO_get_callback(const BIO *b)) (struct bio_st *, int, const char *,

                                        int, long, long) {

    return b->callback;

}

void BIO_set_callback(BIO *b,

                      long (*cb) (struct bio_st *, int, const char *, int,

                                  long, long))

{

    b->callback = cb;

}

void BIO_set_callback_arg(BIO *b, char *arg)

{

    b->cb_arg = arg;

}

char *BIO_get_callback_arg(const BIO *b)

{

    return b->cb_arg;

}

const char *BIO_method_name(const BIO *b)

{

    return b->method->name;

}

int BIO_method_type(const BIO *b)

{

    return b->method->type;

}

int BIO_read(BIO *b, void *out, int outl)

{

    int i;

    long (*cb) (BIO *, int, const char *, int, long, long);

    if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL)) {

        BIOerr(BIO_F_BIO_READ, BIO_R_UNSUPPORTED_METHOD);

        return (-2);

    }

    cb = b->callback;

    if ((cb != NULL) &&

        ((i = (int)cb(b, BIO_CB_READ, out, outl, 0L, 1L)) <= 0))

        return (i);

    if (!b->init) {

        BIOerr(BIO_F_BIO_READ, BIO_R_UNINITIALIZED);

        return (-2);

    }

    i = b->method->bread(b, out, outl);

    if (i > 0)

        b->num_read += (unsigned long)i;

    if (cb != NULL)

        i = (int)cb(b, BIO_CB_READ | BIO_CB_RETURN, out, outl, 0L, (long)i);

    return (i);

}

int BIO_write(BIO *b, const void *in, int inl)

{

    int i;

    long (*cb) (BIO *, int, const char *, int, long, long);

    if (b == NULL)

        return (0);

    cb = b->callback;

    if ((b->method == NULL) || (b->method->bwrite == NULL)) {

        BIOerr(BIO_F_BIO_WRITE, BIO_R_UNSUPPORTED_METHOD);

        return (-2);

    }

    if ((cb != NULL) &&

        ((i = (int)cb(b, BIO_CB_WRITE, in, inl, 0L, 1L)) <= 0))

        return (i);

    if (!b->init) {

        BIOerr(BIO_F_BIO_WRITE, BIO_R_UNINITIALIZED);

        return (-2);

    }

    i = b->method->bwrite(b, in, inl);

    if (i > 0)

        b->num_write += (unsigned long)i;

    if (cb != NULL)

        i = (int)cb(b, BIO_CB_WRITE | BIO_CB_RETURN, in, inl, 0L, (long)i);

    return (i);

}

int BIO_puts(BIO *b, const char *in)

{

    int i;

    long (*cb) (BIO *, int, const char *, int, long, long);

    if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL)) {

        BIOerr(BIO_F_BIO_PUTS, BIO_R_UNSUPPORTED_METHOD);

        return (-2);

    }

    cb = b->callback;

    if ((cb != NULL) && ((i = (int)cb(b, BIO_CB_PUTS, in, 0, 0L, 1L)) <= 0))

        return (i);

    if (!b->init) {

        BIOerr(BIO_F_BIO_PUTS, BIO_R_UNINITIALIZED);

        return (-2);

    }

    i = b->method->bputs(b, in);

    if (i > 0)

        b->num_write += (unsigned long)i;

    if (cb != NULL)

        i = (int)cb(b, BIO_CB_PUTS | BIO_CB_RETURN, in, 0, 0L, (long)i);

    return (i);

}

int BIO_gets(BIO *b, char *in, int inl)

{

    int i;

    long (*cb) (BIO *, int, const char *, int, long, long);

    if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL)) {

        BIOerr(BIO_F_BIO_GETS, BIO_R_UNSUPPORTED_METHOD);

        return (-2);

    }

    cb = b->callback;

    if ((cb != NULL) && ((i = (int)cb(b, BIO_CB_GETS, in, inl, 0L, 1L)) <= 0))

        return (i);

    if (!b->init) {

        BIOerr(BIO_F_BIO_GETS, BIO_R_UNINITIALIZED);

        return (-2);

    }

    i = b->method->bgets(b, in, inl);

    if (cb != NULL)

        i = (int)cb(b, BIO_CB_GETS | BIO_CB_RETURN, in, inl, 0L, (long)i);

    return (i);

}

int BIO_indent(BIO *b, int indent, int max)

{

    if (indent < 0)

        indent = 0;

    if (indent > max)

        indent = max;

    while (indent--)

        if (BIO_puts(b, " ") != 1)

            return 0;

    return 1;

}

long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)

{

    int i;

    i = iarg;

    return (BIO_ctrl(b, cmd, larg, (char *)&i));

}

char *BIO_ptr_ctrl(BIO *b, int cmd, long larg)

{

    char *p = NULL;

    if (BIO_ctrl(b, cmd, larg, (char *)&p) <= 0)

        return (NULL);

    else

        return (p);

}

long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)

{

    long ret;

    long (*cb) (BIO *, int, const char *, int, long, long);

    if (b == NULL)

        return (0);

    if ((b->method == NULL) || (b->method->ctrl == NULL)) {

        BIOerr(BIO_F_BIO_CTRL, BIO_R_UNSUPPORTED_METHOD);

        return (-2);

    }

    cb = b->callback;

    if ((cb != NULL) &&

        ((ret = cb(b, BIO_CB_CTRL, parg, cmd, larg, 1L)) <= 0))

        return (ret);

    ret = b->method->ctrl(b, cmd, larg, parg);

    if (cb != NULL)

        ret = cb(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, cmd, larg, ret);

    return (ret);

}

long BIO_callback_ctrl(BIO *b, int cmd,

                       void (*fp) (struct bio_st *, int, const char *, int,

                                   long, long))

{

    long ret;

    long (*cb) (BIO *, int, const char *, int, long, long);

    if (b == NULL)

        return (0);

    if ((b->method == NULL) || (b->method->callback_ctrl == NULL)) {

        BIOerr(BIO_F_BIO_CALLBACK_CTRL, BIO_R_UNSUPPORTED_METHOD);

        return (-2);

    }

    cb = b->callback;

    if ((cb != NULL) &&

        ((ret = cb(b, BIO_CB_CTRL, (void *)&fp, cmd, 0, 1L)) <= 0))

        return (ret);

    ret = b->method->callback_ctrl(b, cmd, fp);

    if (cb != NULL)

        ret = cb(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, cmd, 0, ret);

    return (ret);

}

/*

 * It is unfortunate to duplicate in functions what the BIO_(w)pending macros

 * do; but those macros have inappropriate return type, and for interfacing

 * from other programming languages, C macros aren't much of a help anyway.

 */

size_t BIO_ctrl_pending(BIO *bio)

{

    return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);

}

size_t BIO_ctrl_wpending(BIO *bio)

{

    return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);

}

/* put the 'bio' on the end of b's list of operators */

BIO *BIO_push(BIO *b, BIO *bio)

{

    BIO *lb;

    if (b == NULL)

        return (bio);

    lb = b;

    while (lb->next_bio != NULL)

        lb = lb->next_bio;

    lb->next_bio = bio;

    if (bio != NULL)

        bio->prev_bio = lb;

    /* called to do internal processing */

    BIO_ctrl(b, BIO_CTRL_PUSH, 0, lb);

    return (b);

}

/* Remove the first and return the rest */

BIO *BIO_pop(BIO *b)

{

    BIO *ret;

    if (b == NULL)

        return (NULL);

    ret = b->next_bio;

    BIO_ctrl(b, BIO_CTRL_POP, 0, b);

    if (b->prev_bio != NULL)

        b->prev_bio->next_bio = b->next_bio;

    if (b->next_bio != NULL)

        b->next_bio->prev_bio = b->prev_bio;

    b->next_bio = NULL;

    b->prev_bio = NULL;

    return (ret);

}

BIO *BIO_get_retry_BIO(BIO *bio, int *reason)

{

    BIO *b, *last;

    b = last = bio;

    for (;;) {

        if (!BIO_should_retry(b))

            break;

        last = b;

        b = b->next_bio;

        if (b == NULL)

            break;

    }

    if (reason != NULL)

        *reason = last->retry_reason;

    return (last);

}

int BIO_get_retry_reason(BIO *bio)

{

    return (bio->retry_reason);

}

BIO *BIO_find_type(BIO *bio, int type)

{

    int mt, mask;

    if (!bio)

        return NULL;

    mask = type & 0xff;

    do {

        if (bio->method != NULL) {

            mt = bio->method->type;

            if (!mask) {

                if (mt & type)

                    return (bio);

            } else if (mt == type)

                return (bio);

        }

        bio = bio->next_bio;

    } while (bio != NULL);

    return (NULL);

}

BIO *BIO_next(BIO *b)

{

    if (!b)

        return NULL;

    return b->next_bio;

}

void BIO_free_all(BIO *bio)

{

    BIO *b;

    int ref;

    while (bio != NULL) {

        b = bio;

        ref = b->references;

        bio = bio->next_bio;

        BIO_free(b);

        /* Since ref count > 1, don't free anyone else. */

        if (ref > 1)

            break;

    }

}

BIO *BIO_dup_chain(BIO *in)

{

    BIO *ret = NULL, *eoc = NULL, *bio, *new_bio;

    for (bio = in; bio != NULL; bio = bio->next_bio) {

        if ((new_bio = BIO_new(bio->method)) == NULL)

            goto err;

        new_bio->callback = bio->callback;

        new_bio->cb_arg = bio->cb_arg;

        new_bio->init = bio->init;

        new_bio->shutdown = bio->shutdown;

        new_bio->flags = bio->flags;

        /* This will let SSL_s_sock() work with stdin/stdout */

        new_bio->num = bio->num;

        if (!BIO_dup_state(bio, (char *)new_bio)) {

            BIO_free(new_bio);

            goto err;

        }

        /* copy app data */

        if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new_bio->ex_data,

                                &bio->ex_data)) {

            BIO_free(new_bio);

            goto err;

        }

        if (ret == NULL) {

            eoc = new_bio;

            ret = eoc;

        } else {

            BIO_push(eoc, new_bio);

            eoc = new_bio;

        }

    }

    return (ret);

 err:

    BIO_free_all(ret);

    return (NULL);

}

void BIO_copy_next_retry(BIO *b)

{

    BIO_set_flags(b, BIO_get_retry_flags(b->next_bio));

    b->retry_reason = b->next_bio->retry_reason;

}

int BIO_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

{

    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_BIO, argl, argp,

                                   new_func, dup_func, free_func);

}

int BIO_set_ex_data(BIO *bio, int idx, void *data)

{

    return (CRYPTO_set_ex_data(&(bio->ex_data), idx, data));

}

void *BIO_get_ex_data(BIO *bio, int idx)

{

    return (CRYPTO_get_ex_data(&(bio->ex_data), idx));

}

unsigned long BIO_number_read(BIO *bio)

{

    if (bio)

        return bio->num_read;

    return 0;

}

unsigned long BIO_number_written(BIO *bio)

{

    if (bio)

        return bio->num_write;

    return 0;

}

IMPLEMENT_STACK_OF(BIO)