[thirdparty/openssl.git] / crypto / bio / bio_lib.c

/* 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>

static STACK_OF(CRYPTO_EX_DATA_FUNCS) *bio_meth=NULL;
static int bio_meth_num=0;

BIO *BIO_new(BIO_METHOD *method)
        {
        BIO *ret=NULL;

        ret=(BIO *)Malloc(sizeof(BIO));
        if (ret == NULL)
                {
                BIOerr(BIO_F_BIO_NEW,ERR_R_MALLOC_FAILURE);
                return(NULL);
                }
        if (!BIO_set(ret,method))
                {
                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(bio_meth,bio,&bio->ex_data);
        if (method->create != NULL)
                if (!method->create(bio))
                        return(0);
        return(1);
        }

int BIO_free(BIO *a)
        {
        int ret=0,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(bio_meth,a,&a->ex_data);

        if ((a->method == NULL) || (a->method->destroy == NULL)) return(1);
        ret=a->method->destroy(a);
        Free(a);
        return(1);
        }

int BIO_read(BIO *b, void *out, int outl)
        {
        int i;
        long (*cb)();

        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 char *in, int inl)
        {
        int i;
        long (*cb)();

        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;

        /* This is evil and not thread safe.  If the BIO has been freed,
         * we must not call the callback.  The only way to be able to
         * determine this is the reference count which is now invalid since
         * the memory has been free()ed.
         */
        if (b->references <= 0) abort();
        if (cb != NULL) /* && (b->references >= 1)) */
                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)();

        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 (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)();

        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);
        }

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)();

        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)())
        {
        long ret;
        long (*cb)();

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

        if ((b->method == NULL) || (b->method->callback_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,(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,NULL);
        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;

        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;
        BIO_ctrl(b,BIO_CTRL_POP,0,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;

        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);
        }

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;

        for (bio=in; bio != NULL; bio=bio->next_bio)
                {
                if ((new=BIO_new(bio->method)) == NULL) goto err;
                new->callback=bio->callback;
                new->cb_arg=bio->cb_arg;
                new->init=bio->init;
                new->shutdown=bio->shutdown;
                new->flags=bio->flags;

                /* This will let SSL_s_sock() work with stdin/stdout */
                new->num=bio->num;

                if (!BIO_dup_state(bio,(char *)new))
                        {
                        BIO_free(new);
                        goto err;
                        }

                /* copy app data */
                if (!CRYPTO_dup_ex_data(bio_meth,&new->ex_data,&bio->ex_data))
                        goto err;

                if (ret == NULL)
                        {
                        eoc=new;
                        ret=eoc;
                        }
                else
                        {
                        BIO_push(eoc,new);
                        eoc=new;
                        }
                }
        return(ret);
err:
        if (ret != NULL)
                BIO_free(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)
        {
        bio_meth_num++;
        return(CRYPTO_get_ex_new_index(bio_meth_num-1,&bio_meth,
                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;
}