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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>

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

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

void BIO_vfree(BIO *a)
    { BIO_free(a); }

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 void *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;

      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)();

      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)();

      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)();

      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)();

      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;

      BIO_ctrl(b,BIO_CTRL_POP,0,NULL);

      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;

      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(CRYPTO_EX_INDEX_BIO, &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)
      {
      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)

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