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bf_lbuf.c

/* crypto/bio/bf_buff.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 "cryptlib.h"
#include <openssl/bio.h>
#include <openssl/evp.h>

static int linebuffer_write(BIO *h, const char *buf,int num);
static int linebuffer_read(BIO *h, char *buf, int size);
static int linebuffer_puts(BIO *h, const char *str);
static int linebuffer_gets(BIO *h, char *str, int size);
static long linebuffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int linebuffer_new(BIO *h);
static int linebuffer_free(BIO *data);
static long linebuffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);

/* A 10k maximum should be enough for most purposes */
#define DEFAULT_LINEBUFFER_SIZE     1024*10

/* #define DEBUG */

static BIO_METHOD methods_linebuffer=
      {
      BIO_TYPE_LINEBUFFER,
      "linebuffer",
      linebuffer_write,
      linebuffer_read,
      linebuffer_puts,
      linebuffer_gets,
      linebuffer_ctrl,
      linebuffer_new,
      linebuffer_free,
      linebuffer_callback_ctrl,
      };

BIO_METHOD *BIO_f_linebuffer(void)
      {
      return(&methods_linebuffer);
      }

typedef struct bio_linebuffer_ctx_struct
      {
      char *obuf;       /* the output char array */
      int obuf_size;          /* how big is the output buffer */
      int obuf_len;           /* how many bytes are in it */
      } BIO_LINEBUFFER_CTX;

static int linebuffer_new(BIO *bi)
      {
      BIO_LINEBUFFER_CTX *ctx;

      ctx=(BIO_LINEBUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_LINEBUFFER_CTX));
      if (ctx == NULL) return(0);
      ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
      if (ctx->obuf == NULL) { OPENSSL_free(ctx); return(0); }
      ctx->obuf_size=DEFAULT_LINEBUFFER_SIZE;
      ctx->obuf_len=0;

      bi->init=1;
      bi->ptr=(char *)ctx;
      bi->flags=0;
      return(1);
      }

static int linebuffer_free(BIO *a)
      {
      BIO_LINEBUFFER_CTX *b;

      if (a == NULL) return(0);
      b=(BIO_LINEBUFFER_CTX *)a->ptr;
      if (b->obuf != NULL) OPENSSL_free(b->obuf);
      OPENSSL_free(a->ptr);
      a->ptr=NULL;
      a->init=0;
      a->flags=0;
      return(1);
      }
      
static int linebuffer_read(BIO *b, char *out, int outl)
      {
      int ret=0;
 
      if (out == NULL) return(0);
      if (b->next_bio == NULL) return(0);
      ret=BIO_read(b->next_bio,out,outl);
      BIO_clear_retry_flags(b);
      BIO_copy_next_retry(b);
      return(ret);
      }

static int linebuffer_write(BIO *b, const char *in, int inl)
      {
      int i,num=0,foundnl;
      BIO_LINEBUFFER_CTX *ctx;

      if ((in == NULL) || (inl <= 0)) return(0);
      ctx=(BIO_LINEBUFFER_CTX *)b->ptr;
      if ((ctx == NULL) || (b->next_bio == NULL)) return(0);

      BIO_clear_retry_flags(b);

      do
            {
            const char *p;

            for(p = in; p < in + inl && *p != '\n'; p++)
                  ;
            if (*p == '\n')
                  {
                  p++;
                  foundnl = 1;
                  }
            else
                  foundnl = 0;

            /* If a NL was found and we already have text in the save
               buffer, concatenate them and write */
            while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
                  && ctx->obuf_len > 0)
                  {
                  int orig_olen = ctx->obuf_len;
                  
                  i = ctx->obuf_size - ctx->obuf_len;
                  if (p - in > 0)
                        {
                        if (i >= p - in)
                              {
                              memcpy(&(ctx->obuf[ctx->obuf_len]),
                                    in,p - in);
                              ctx->obuf_len += p - in;
                              inl -= p - in;
                              num += p - in;
                              in = p;
                              }
                        else
                              {
                              memcpy(&(ctx->obuf[ctx->obuf_len]),
                                    in,i);
                              ctx->obuf_len += i;
                              inl -= i;
                              in += i;
                              num += i;
                              }
                        }

#if 0
BIO_write(b->next_bio, "<*<", 3);
#endif
                  i=BIO_write(b->next_bio,
                        ctx->obuf, ctx->obuf_len);
                  if (i <= 0)
                        {
                        ctx->obuf_len = orig_olen;
                        BIO_copy_next_retry(b);

#if 0
BIO_write(b->next_bio, ">*>", 3);
#endif
                        if (i < 0) return((num > 0)?num:i);
                        if (i == 0) return(num);
                        }
#if 0
BIO_write(b->next_bio, ">*>", 3);
#endif
                  if (i < ctx->obuf_len)
                        memmove(ctx->obuf, ctx->obuf + i,
                              ctx->obuf_len - i);
                  ctx->obuf_len-=i;
                  }

            /* Now that the save buffer is emptied, let's write the input
               buffer if a NL was found and there is anything to write. */
            if ((foundnl || p - in > ctx->obuf_size) && p - in > 0)
                  {
#if 0
BIO_write(b->next_bio, "<*<", 3);
#endif
                  i=BIO_write(b->next_bio,in,p - in);
                  if (i <= 0)
                        {
                        BIO_copy_next_retry(b);
#if 0
BIO_write(b->next_bio, ">*>", 3);
#endif
                        if (i < 0) return((num > 0)?num:i);
                        if (i == 0) return(num);
                        }
#if 0
BIO_write(b->next_bio, ">*>", 3);
#endif
                  num+=i;
                  in+=i;
                  inl-=i;
                  }
            }
      while(foundnl && inl > 0);
      /* We've written as much as we can.  The rest of the input buffer, if
         any, is text that doesn't and with a NL and therefore needs to be
         saved for the next trip. */
      if (inl > 0)
            {
            memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
            ctx->obuf_len += inl;
            num += inl;
            }
      return num;
      }

static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
      {
      BIO *dbio;
      BIO_LINEBUFFER_CTX *ctx;
      long ret=1;
      char *p;
      int r;
      int obs;

      ctx=(BIO_LINEBUFFER_CTX *)b->ptr;

      switch (cmd)
            {
      case BIO_CTRL_RESET:
            ctx->obuf_len=0;
            if (b->next_bio == NULL) return(0);
            ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
            break;
      case BIO_CTRL_INFO:
            ret=(long)ctx->obuf_len;
            break;
      case BIO_CTRL_WPENDING:
            ret=(long)ctx->obuf_len;
            if (ret == 0)
                  {
                  if (b->next_bio == NULL) return(0);
                  ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
                  }
            break;
      case BIO_C_SET_BUFF_SIZE:
            obs=(int)num;
            p=ctx->obuf;
            if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size))
                  {
                  p=(char *)OPENSSL_malloc((int)num);
                  if (p == NULL)
                        goto malloc_error;
                  }
            if (ctx->obuf != p)
                  {
                  if (ctx->obuf_len > obs)
                        {
                        ctx->obuf_len = obs;
                        }
                  memcpy(p, ctx->obuf, ctx->obuf_len);
                  OPENSSL_free(ctx->obuf);
                  ctx->obuf=p;
                  ctx->obuf_size=obs;
                  }
            break;
      case BIO_C_DO_STATE_MACHINE:
            if (b->next_bio == NULL) return(0);
            BIO_clear_retry_flags(b);
            ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
            BIO_copy_next_retry(b);
            break;

      case BIO_CTRL_FLUSH:
            if (b->next_bio == NULL) return(0);
            if (ctx->obuf_len <= 0)
                  {
                  ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
                  break;
                  }

            for (;;)
                  {
                  BIO_clear_retry_flags(b);
                  if (ctx->obuf_len > 0)
                        {
                        r=BIO_write(b->next_bio,
                              ctx->obuf, ctx->obuf_len);
#if 0
fprintf(stderr,"FLUSH %3d -> %3d\n",ctx->obuf_len,r);
#endif
                        BIO_copy_next_retry(b);
                        if (r <= 0) return((long)r);
                        if (r < ctx->obuf_len)
                              memmove(ctx->obuf, ctx->obuf + r,
                                    ctx->obuf_len - r);
                        ctx->obuf_len-=r;
                        }
                  else
                        {
                        ctx->obuf_len=0;
                        ret=1;
                        break;
                        }
                  }
            ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
            break;
      case BIO_CTRL_DUP:
            dbio=(BIO *)ptr;
            if (  !BIO_set_write_buffer_size(dbio,ctx->obuf_size))
                  ret=0;
            break;
      default:
            if (b->next_bio == NULL) return(0);
            ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
            break;
            }
      return(ret);
malloc_error:
      BIOerr(BIO_F_LINEBUFFER_CTRL,ERR_R_MALLOC_FAILURE);
      return(0);
      }

static long linebuffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
      {
      long ret=1;

      if (b->next_bio == NULL) return(0);
      switch (cmd)
            {
      default:
            ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
            break;
            }
      return(ret);
      }

static int linebuffer_gets(BIO *b, char *buf, int size)
      {
      if (b->next_bio == NULL) return(0);
      return(BIO_gets(b->next_bio,buf,size));
      }

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


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