BIO range checking.
[openssl.git] / crypto / bio / bss_file.c
index ba4f8e9..e7bbc31 100644 (file)
-/* crypto/bio/bss_file.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2017 The OpenSSL Project Authors. 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.]
+ * 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
  */
 
-/*
- * 03-Dec-1997 rdenny@dc3.com  Fix bug preventing use of stdin/stdout
- *             with binary data (e.g. asn1parse -inform DER < xxx) under
- *             Windows
+/*-
+ * 03-Dec-1997  rdenny@dc3.com  Fix bug preventing use of stdin/stdout
+ *              with binary data (e.g. asn1parse -inform DER < xxx) under
+ *              Windows
  */
 
 #ifndef HEADER_BSS_FILE_C
-#define HEADER_BSS_FILE_C
-
-#if defined(__linux) || defined(__sun) || defined(__hpux)
-/* Following definition aliases fopen to fopen64 on above mentioned
- * platforms. This makes it possible to open and sequentially access
- * files larger than 2GB from 32-bit application. It does not allow to
- * traverse them beyond 2GB with fseek/ftell, but on the other hand *no*
- * 32-bit platform permits that, not with fseek/ftell. Not to mention
- * that breaking 2GB limit for seeking would require surgery to *our*
- * API. But sequential access suffices for practical cases when you
- * can run into large files, such as fingerprinting, so we can let API
- * alone. For reference, the list of 32-bit platforms which allow for
- * sequential access of large files without extra "magic" comprise *BSD,
- * Darwin, IRIX...
+# define HEADER_BSS_FILE_C
+
+# if defined(__linux) || defined(__sun) || defined(__hpux)
+/*
+ * Following definition aliases fopen to fopen64 on above mentioned
+ * platforms. This makes it possible to open and sequentially access files
+ * larger than 2GB from 32-bit application. It does not allow to traverse
+ * them beyond 2GB with fseek/ftell, but on the other hand *no* 32-bit
+ * platform permits that, not with fseek/ftell. Not to mention that breaking
+ * 2GB limit for seeking would require surgery to *our* API. But sequential
+ * access suffices for practical cases when you can run into large files,
+ * such as fingerprinting, so we can let API alone. For reference, the list
+ * of 32-bit platforms which allow for sequential access of large files
+ * without extra "magic" comprise *BSD, Darwin, IRIX...
  */
-#ifndef _FILE_OFFSET_BITS
-#define _FILE_OFFSET_BITS 64
-#endif
-#endif
-
-#include <stdio.h>
-#include <errno.h>
-#include "cryptlib.h"
-#include "bio_lcl.h"
-#include <openssl/err.h>
-
-#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_CLIB)
-#include <nwfileio.h>
-#endif
-
-#if !defined(OPENSSL_NO_STDIO)
-
-static int MS_CALLBACK file_write(BIO *h, const char *buf, int num);
-static int MS_CALLBACK file_read(BIO *h, char *buf, int size);
-static int MS_CALLBACK file_puts(BIO *h, const char *str);
-static int MS_CALLBACK file_gets(BIO *h, char *str, int size);
-static long MS_CALLBACK file_ctrl(BIO *h, int cmd, long arg1, void *arg2);
-static int MS_CALLBACK file_new(BIO *h);
-static int MS_CALLBACK file_free(BIO *data);
-static BIO_METHOD methods_filep=
-       {
-       BIO_TYPE_FILE,
-       "FILE pointer",
-       file_write,
-       file_read,
-       file_puts,
-       file_gets,
-       file_ctrl,
-       file_new,
-       file_free,
-       NULL,
-       };
+#  ifndef _FILE_OFFSET_BITS
+#   define _FILE_OFFSET_BITS 64
+#  endif
+# endif
+
+# include <stdio.h>
+# include <errno.h>
+# include "bio_lcl.h"
+# include <openssl/err.h>
+
+# if !defined(OPENSSL_NO_STDIO)
+
+static int file_write(BIO *h, const char *buf, int num);
+static int file_read(BIO *h, char *buf, int size);
+static int file_puts(BIO *h, const char *str);
+static int file_gets(BIO *h, char *str, int size);
+static long file_ctrl(BIO *h, int cmd, long arg1, void *arg2);
+static int file_new(BIO *h);
+static int file_free(BIO *data);
+static const BIO_METHOD methods_filep = {
+    BIO_TYPE_FILE,
+    "FILE pointer",
+    /* TODO: Convert to new style write function */
+    bwrite_conv,
+    file_write,
+    /* TODO: Convert to new style read function */
+    bread_conv,
+    file_read,
+    file_puts,
+    file_gets,
+    file_ctrl,
+    file_new,
+    file_free,
+    NULL,
+};
 
 BIO *BIO_new_file(const char *filename, const char *mode)
-       {
-       BIO *ret;
-       FILE *file;
-
-       if ((file=fopen(filename,mode)) == NULL)
-               {
-               SYSerr(SYS_F_FOPEN,get_last_sys_error());
-               ERR_add_error_data(5,"fopen('",filename,"','",mode,"')");
-               if (errno == ENOENT)
-                       BIOerr(BIO_F_BIO_NEW_FILE,BIO_R_NO_SUCH_FILE);
-               else
-                       BIOerr(BIO_F_BIO_NEW_FILE,ERR_R_SYS_LIB);
-               return(NULL);
-               }
-       if ((ret=BIO_new(BIO_s_file())) == NULL)
-               {
-               fclose(file);
-               return(NULL);
-               }
-
-       BIO_clear_flags(ret,BIO_FLAGS_UPLINK); /* we did fopen -> we disengage UPLINK */
-       BIO_set_fp(ret,file,BIO_CLOSE);
-       return(ret);
-       }
+{
+    BIO  *ret;
+    FILE *file = openssl_fopen(filename, mode);
+    int fp_flags = BIO_CLOSE;
+
+    if (strchr(mode, 'b') == NULL)
+        fp_flags |= BIO_FP_TEXT;
+
+    if (file == NULL) {
+        SYSerr(SYS_F_FOPEN, get_last_sys_error());
+        ERR_add_error_data(5, "fopen('", filename, "','", mode, "')");
+        if (errno == ENOENT
+# ifdef ENXIO
+            || errno == ENXIO
+# endif
+            )
+            BIOerr(BIO_F_BIO_NEW_FILE, BIO_R_NO_SUCH_FILE);
+        else
+            BIOerr(BIO_F_BIO_NEW_FILE, ERR_R_SYS_LIB);
+        return NULL;
+    }
+    if ((ret = BIO_new(BIO_s_file())) == NULL) {
+        fclose(file);
+        return NULL;
+    }
+
+    BIO_clear_flags(ret, BIO_FLAGS_UPLINK); /* we did fopen -> we disengage
+                                             * UPLINK */
+    BIO_set_fp(ret, file, fp_flags);
+    return ret;
+}
 
 BIO *BIO_new_fp(FILE *stream, int close_flag)
-       {
-       BIO *ret;
-
-       if ((ret=BIO_new(BIO_s_file())) == NULL)
-               return(NULL);
-
-       BIO_set_flags(ret,BIO_FLAGS_UPLINK); /* redundant, left for documentation puposes */
-       BIO_set_fp(ret,stream,close_flag);
-       return(ret);
-       }
-
-BIO_METHOD *BIO_s_file(void)
-       {
-       return(&methods_filep);
-       }
-
-static int MS_CALLBACK file_new(BIO *bi)
-       {
-       bi->init=0;
-       bi->num=0;
-       bi->ptr=NULL;
-       bi->flags=BIO_FLAGS_UPLINK; /* default to UPLINK */
-       return(1);
-       }
-
-static int MS_CALLBACK file_free(BIO *a)
-       {
-       if (a == NULL) return(0);
-       if (a->shutdown)
-               {
-               if ((a->init) && (a->ptr != NULL))
-                       {
-                       if (a->flags&BIO_FLAGS_UPLINK)
-                               UP_fclose (a->ptr);
-                       else
-                               fclose (a->ptr);
-                       a->ptr=NULL;
-                       a->flags=BIO_FLAGS_UPLINK;
-                       }
-               a->init=0;
-               }
-       return(1);
-       }
-       
-static int MS_CALLBACK file_read(BIO *b, char *out, int outl)
-       {
-       int ret=0;
-
-       if (b->init && (out != NULL))
-               {
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       ret=UP_fread(out,1,(int)outl,b->ptr);
-               else
-                       ret=fread(out,1,(int)outl,(FILE *)b->ptr);
-               if(ret == 0 && (b->flags&BIO_FLAGS_UPLINK)?UP_ferror((FILE *)b->ptr):ferror((FILE *)b->ptr))
-                       {
-                       SYSerr(SYS_F_FREAD,get_last_sys_error());
-                       BIOerr(BIO_F_FILE_READ,ERR_R_SYS_LIB);
-                       ret=-1;
-                       }
-               }
-       return(ret);
-       }
-
-static int MS_CALLBACK file_write(BIO *b, const char *in, int inl)
-       {
-       int ret=0;
-
-       if (b->init && (in != NULL))
-               {
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       ret=UP_fwrite(in,(int)inl,1,b->ptr);
-               else
-                       ret=fwrite(in,(int)inl,1,(FILE *)b->ptr);
-               if (ret)
-                       ret=inl;
-               /* ret=fwrite(in,1,(int)inl,(FILE *)b->ptr); */
-               /* according to Tim Hudson <tjh@cryptsoft.com>, the commented
-                * out version above can cause 'inl' write calls under
-                * some stupid stdio implementations (VMS) */
-               }
-       return(ret);
-       }
-
-static long MS_CALLBACK file_ctrl(BIO *b, int cmd, long num, void *ptr)
-       {
-       long ret=1;
-       FILE *fp=(FILE *)b->ptr;
-       FILE **fpp;
-       char p[4];
-
-       switch (cmd)
-               {
-       case BIO_C_FILE_SEEK:
-       case BIO_CTRL_RESET:
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       ret=(long)UP_fseek(b->ptr,num,0);
-               else
-                       ret=(long)fseek(fp,num,0);
-               break;
-       case BIO_CTRL_EOF:
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       ret=(long)UP_feof(fp);
-               else
-                       ret=(long)feof(fp);
-               break;
-       case BIO_C_FILE_TELL:
-       case BIO_CTRL_INFO:
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       ret=UP_ftell(b->ptr);
-               else
-                       ret=ftell(fp);
-               break;
-       case BIO_C_SET_FILE_PTR:
-               file_free(b);
-               b->shutdown=(int)num&BIO_CLOSE;
-               b->ptr=ptr;
-               b->init=1;
-#if BIO_FLAGS_UPLINK!=0
-#if defined(__MINGW32__) && defined(__MSVCRT__) && !defined(_IOB_ENTRIES)
-#define _IOB_ENTRIES 20
-#endif
-#if defined(_IOB_ENTRIES)
-               /* Safety net to catch purely internal BIO_set_fp calls */
-               if ((size_t)ptr >= (size_t)stdin &&
-                   (size_t)ptr <  (size_t)(stdin+_IOB_ENTRIES))
-                       BIO_clear_flags(b,BIO_FLAGS_UPLINK);
-#endif
-#endif
-#ifdef UP_fsetmod
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       UP_fsetmod(b->ptr,(char)((num&BIO_FP_TEXT)?'t':'b'));
-               else
-#endif
-               {
-#if defined(OPENSSL_SYS_WINDOWS)
-               int fd = _fileno((FILE*)ptr);
-               if (num & BIO_FP_TEXT)
-                       _setmode(fd,_O_TEXT);
-               else
-                       _setmode(fd,_O_BINARY);
-#elif defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_CLIB)
-               int fd = fileno((FILE*)ptr);
-               /* Under CLib there are differences in file modes */
-               if (num & BIO_FP_TEXT)
-                       setmode(fd,O_TEXT);
-               else
-                       setmode(fd,O_BINARY);
-#elif defined(OPENSSL_SYS_MSDOS)
-               int fd = fileno((FILE*)ptr);
-               /* Set correct text/binary mode */
-               if (num & BIO_FP_TEXT)
-                       _setmode(fd,_O_TEXT);
-               /* Dangerous to set stdin/stdout to raw (unless redirected) */
-               else
-                       {
-                       if (fd == STDIN_FILENO || fd == STDOUT_FILENO)
-                               {
-                               if (isatty(fd) <= 0)
-                                       _setmode(fd,_O_BINARY);
-                               }
-                       else
-                               _setmode(fd,_O_BINARY);
-                       }
-#elif defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_WIN32_CYGWIN)
-               int fd = fileno((FILE*)ptr);
-               if (num & BIO_FP_TEXT)
-                       setmode(fd, O_TEXT);
-               else
-                       setmode(fd, O_BINARY);
-#endif
-               }
-               break;
-       case BIO_C_SET_FILENAME:
-               file_free(b);
-               b->shutdown=(int)num&BIO_CLOSE;
-               if (num & BIO_FP_APPEND)
-                       {
-                       if (num & BIO_FP_READ)
-                               BUF_strlcpy(p,"a+",sizeof p);
-                       else    BUF_strlcpy(p,"a",sizeof p);
-                       }
-               else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
-                       BUF_strlcpy(p,"r+",sizeof p);
-               else if (num & BIO_FP_WRITE)
-                       BUF_strlcpy(p,"w",sizeof p);
-               else if (num & BIO_FP_READ)
-                       BUF_strlcpy(p,"r",sizeof p);
-               else
-                       {
-                       BIOerr(BIO_F_FILE_CTRL,BIO_R_BAD_FOPEN_MODE);
-                       ret=0;
-                       break;
-                       }
-#if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_WIN32_CYGWIN)
-               if (!(num & BIO_FP_TEXT))
-                       strcat(p,"b");
-               else
-                       strcat(p,"t");
-#endif
-#if defined(OPENSSL_SYS_NETWARE)
-               if (!(num & BIO_FP_TEXT))
-                       strcat(p,"b");
-               else
-                       strcat(p,"t");
-#endif
-               fp=fopen(ptr,p);
-               if (fp == NULL)
-                       {
-                       SYSerr(SYS_F_FOPEN,get_last_sys_error());
-                       ERR_add_error_data(5,"fopen('",ptr,"','",p,"')");
-                       BIOerr(BIO_F_FILE_CTRL,ERR_R_SYS_LIB);
-                       ret=0;
-                       break;
-                       }
-               b->ptr=fp;
-               b->init=1;
-               BIO_clear_flags(b,BIO_FLAGS_UPLINK); /* we did fopen -> we disengage UPLINK */
-               break;
-       case BIO_C_GET_FILE_PTR:
-               /* the ptr parameter is actually a FILE ** in this case. */
-               if (ptr != NULL)
-                       {
-                       fpp=(FILE **)ptr;
-                       *fpp=(FILE *)b->ptr;
-                       }
-               break;
-       case BIO_CTRL_GET_CLOSE:
-               ret=(long)b->shutdown;
-               break;
-       case BIO_CTRL_SET_CLOSE:
-               b->shutdown=(int)num;
-               break;
-       case BIO_CTRL_FLUSH:
-               if (b->flags&BIO_FLAGS_UPLINK)
-                       UP_fflush(b->ptr);
-               else
-                       fflush((FILE *)b->ptr);
-               break;
-       case BIO_CTRL_DUP:
-               ret=1;
-               break;
-
-       case BIO_CTRL_WPENDING:
-       case BIO_CTRL_PENDING:
-       case BIO_CTRL_PUSH:
-       case BIO_CTRL_POP:
-       default:
-               ret=0;
-               break;
-               }
-       return(ret);
-       }
-
-static int MS_CALLBACK file_gets(BIO *bp, char *buf, int size)
-       {
-       int ret=0;
-
-       buf[0]='\0';
-       if (bp->flags&BIO_FLAGS_UPLINK)
-               {
-               if (!UP_fgets(buf,size,bp->ptr))
-                       goto err;
-               }
-       else
-               {
-               if (!fgets(buf,size,(FILE *)bp->ptr))
-                       goto err;
-               }
-       if (buf[0] != '\0')
-               ret=strlen(buf);
-       err:
-       return(ret);
-       }
-
-static int MS_CALLBACK file_puts(BIO *bp, const char *str)
-       {
-       int n,ret;
-
-       n=strlen(str);
-       ret=file_write(bp,str,n);
-       return(ret);
-       }
-
-#endif /* OPENSSL_NO_STDIO */
-
-#endif /* HEADER_BSS_FILE_C */
+{
+    BIO *ret;
+
+    if ((ret = BIO_new(BIO_s_file())) == NULL)
+        return NULL;
+
+    /* redundant flag, left for documentation purposes */
+    BIO_set_flags(ret, BIO_FLAGS_UPLINK);
+    BIO_set_fp(ret, stream, close_flag);
+    return ret;
+}
+
+const BIO_METHOD *BIO_s_file(void)
+{
+    return &methods_filep;
+}
+
+static int file_new(BIO *bi)
+{
+    bi->init = 0;
+    bi->num = 0;
+    bi->ptr = NULL;
+    bi->flags = BIO_FLAGS_UPLINK; /* default to UPLINK */
+    return 1;
+}
+
+static int file_free(BIO *a)
+{
+    if (a == NULL)
+        return 0;
+    if (a->shutdown) {
+        if ((a->init) && (a->ptr != NULL)) {
+            if (a->flags & BIO_FLAGS_UPLINK)
+                UP_fclose(a->ptr);
+            else
+                fclose(a->ptr);
+            a->ptr = NULL;
+            a->flags = BIO_FLAGS_UPLINK;
+        }
+        a->init = 0;
+    }
+    return 1;
+}
+
+static int file_read(BIO *b, char *out, int outl)
+{
+    int ret = 0;
+
+    if (b->init && (out != NULL)) {
+        if (b->flags & BIO_FLAGS_UPLINK)
+            ret = UP_fread(out, 1, (int)outl, b->ptr);
+        else
+            ret = fread(out, 1, (int)outl, (FILE *)b->ptr);
+        if (ret == 0
+            && (b->flags & BIO_FLAGS_UPLINK) ? UP_ferror((FILE *)b->ptr) :
+                                               ferror((FILE *)b->ptr)) {
+            SYSerr(SYS_F_FREAD, get_last_sys_error());
+            BIOerr(BIO_F_FILE_READ, ERR_R_SYS_LIB);
+            ret = -1;
+        }
+    }
+    return ret;
+}
+
+static int file_write(BIO *b, const char *in, int inl)
+{
+    int ret = 0;
+
+    if (b->init && (in != NULL)) {
+        if (b->flags & BIO_FLAGS_UPLINK)
+            ret = UP_fwrite(in, (int)inl, 1, b->ptr);
+        else
+            ret = fwrite(in, (int)inl, 1, (FILE *)b->ptr);
+        if (ret)
+            ret = inl;
+        /* ret=fwrite(in,1,(int)inl,(FILE *)b->ptr); */
+        /*
+         * according to Tim Hudson <tjh@cryptsoft.com>, the commented out
+         * version above can cause 'inl' write calls under some stupid stdio
+         * implementations (VMS)
+         */
+    }
+    return ret;
+}
+
+static long file_ctrl(BIO *b, int cmd, long num, void *ptr)
+{
+    long ret = 1;
+    FILE *fp = (FILE *)b->ptr;
+    FILE **fpp;
+    char p[4];
+    int st;
+
+    switch (cmd) {
+    case BIO_C_FILE_SEEK:
+    case BIO_CTRL_RESET:
+        if (b->flags & BIO_FLAGS_UPLINK)
+            ret = (long)UP_fseek(b->ptr, num, 0);
+        else
+            ret = (long)fseek(fp, num, 0);
+        break;
+    case BIO_CTRL_EOF:
+        if (b->flags & BIO_FLAGS_UPLINK)
+            ret = (long)UP_feof(fp);
+        else
+            ret = (long)feof(fp);
+        break;
+    case BIO_C_FILE_TELL:
+    case BIO_CTRL_INFO:
+        if (b->flags & BIO_FLAGS_UPLINK)
+            ret = UP_ftell(b->ptr);
+        else
+            ret = ftell(fp);
+        break;
+    case BIO_C_SET_FILE_PTR:
+        file_free(b);
+        b->shutdown = (int)num & BIO_CLOSE;
+        b->ptr = ptr;
+        b->init = 1;
+#  if BIO_FLAGS_UPLINK!=0
+#   if defined(__MINGW32__) && defined(__MSVCRT__) && !defined(_IOB_ENTRIES)
+#    define _IOB_ENTRIES 20
+#   endif
+        /* Safety net to catch purely internal BIO_set_fp calls */
+#   if defined(_MSC_VER) && _MSC_VER>=1900
+        if (ptr == stdin || ptr == stdout || ptr == stderr)
+            BIO_clear_flags(b, BIO_FLAGS_UPLINK);
+#   elif defined(_IOB_ENTRIES)
+        if ((size_t)ptr >= (size_t)stdin &&
+            (size_t)ptr < (size_t)(stdin + _IOB_ENTRIES))
+            BIO_clear_flags(b, BIO_FLAGS_UPLINK);
+#   endif
+#  endif
+#  ifdef UP_fsetmod
+        if (b->flags & BIO_FLAGS_UPLINK)
+            UP_fsetmod(b->ptr, (char)((num & BIO_FP_TEXT) ? 't' : 'b'));
+        else
+#  endif
+        {
+#  if defined(OPENSSL_SYS_WINDOWS)
+            int fd = _fileno((FILE *)ptr);
+            if (num & BIO_FP_TEXT)
+                _setmode(fd, _O_TEXT);
+            else
+                _setmode(fd, _O_BINARY);
+#  elif defined(OPENSSL_SYS_MSDOS)
+            int fd = fileno((FILE *)ptr);
+            /* Set correct text/binary mode */
+            if (num & BIO_FP_TEXT)
+                _setmode(fd, _O_TEXT);
+            /* Dangerous to set stdin/stdout to raw (unless redirected) */
+            else {
+                if (fd == STDIN_FILENO || fd == STDOUT_FILENO) {
+                    if (isatty(fd) <= 0)
+                        _setmode(fd, _O_BINARY);
+                } else
+                    _setmode(fd, _O_BINARY);
+            }
+#  elif defined(OPENSSL_SYS_WIN32_CYGWIN)
+            int fd = fileno((FILE *)ptr);
+            if (num & BIO_FP_TEXT)
+                setmode(fd, O_TEXT);
+            else
+                setmode(fd, O_BINARY);
+#  endif
+        }
+        break;
+    case BIO_C_SET_FILENAME:
+        file_free(b);
+        b->shutdown = (int)num & BIO_CLOSE;
+        if (num & BIO_FP_APPEND) {
+            if (num & BIO_FP_READ)
+                OPENSSL_strlcpy(p, "a+", sizeof(p));
+            else
+                OPENSSL_strlcpy(p, "a", sizeof(p));
+        } else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
+            OPENSSL_strlcpy(p, "r+", sizeof(p));
+        else if (num & BIO_FP_WRITE)
+            OPENSSL_strlcpy(p, "w", sizeof(p));
+        else if (num & BIO_FP_READ)
+            OPENSSL_strlcpy(p, "r", sizeof(p));
+        else {
+            BIOerr(BIO_F_FILE_CTRL, BIO_R_BAD_FOPEN_MODE);
+            ret = 0;
+            break;
+        }
+#  if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32_CYGWIN)
+        if (!(num & BIO_FP_TEXT))
+            OPENSSL_strlcat(p, "b", sizeof(p));
+        else
+            OPENSSL_strlcat(p, "t", sizeof(p));
+#  endif
+        fp = openssl_fopen(ptr, p);
+        if (fp == NULL) {
+            SYSerr(SYS_F_FOPEN, get_last_sys_error());
+            ERR_add_error_data(5, "fopen('", ptr, "','", p, "')");
+            BIOerr(BIO_F_FILE_CTRL, ERR_R_SYS_LIB);
+            ret = 0;
+            break;
+        }
+        b->ptr = fp;
+        b->init = 1;
+        BIO_clear_flags(b, BIO_FLAGS_UPLINK); /* we did fopen -> we disengage
+                                               * UPLINK */
+        break;
+    case BIO_C_GET_FILE_PTR:
+        /* the ptr parameter is actually a FILE ** in this case. */
+        if (ptr != NULL) {
+            fpp = (FILE **)ptr;
+            *fpp = (FILE *)b->ptr;
+        }
+        break;
+    case BIO_CTRL_GET_CLOSE:
+        ret = (long)b->shutdown;
+        break;
+    case BIO_CTRL_SET_CLOSE:
+        b->shutdown = (int)num;
+        break;
+    case BIO_CTRL_FLUSH:
+        st = b->flags & BIO_FLAGS_UPLINK
+                ? UP_fflush(b->ptr) : fflush((FILE *)b->ptr);
+        if (st == EOF) {
+            SYSerr(SYS_F_FFLUSH, get_last_sys_error());
+            ERR_add_error_data(1, "fflush()");
+            BIOerr(BIO_F_FILE_CTRL, ERR_R_SYS_LIB);
+            ret = 0;
+        }
+        break;
+    case BIO_CTRL_DUP:
+        ret = 1;
+        break;
+
+    case BIO_CTRL_WPENDING:
+    case BIO_CTRL_PENDING:
+    case BIO_CTRL_PUSH:
+    case BIO_CTRL_POP:
+    default:
+        ret = 0;
+        break;
+    }
+    return ret;
+}
+
+static int file_gets(BIO *bp, char *buf, int size)
+{
+    int ret = 0;
+
+    buf[0] = '\0';
+    if (bp->flags & BIO_FLAGS_UPLINK) {
+        if (!UP_fgets(buf, size, bp->ptr))
+            goto err;
+    } else {
+        if (!fgets(buf, size, (FILE *)bp->ptr))
+            goto err;
+    }
+    if (buf[0] != '\0')
+        ret = strlen(buf);
+ err:
+    return ret;
+}
+
+static int file_puts(BIO *bp, const char *str)
+{
+    int n, ret;
+
+    n = strlen(str);
+    ret = file_write(bp, str, n);
+    return ret;
+}
+
+#else
+
+static int file_write(BIO *b, const char *in, int inl)
+{
+    return -1;
+}
+static int file_read(BIO *b, char *out, int outl)
+{
+    return -1;
+}
+static int file_puts(BIO *bp, const char *str)
+{
+    return -1;
+}
+static int file_gets(BIO *bp, char *buf, int size)
+{
+    return 0;
+}
+static long file_ctrl(BIO *b, int cmd, long num, void *ptr)
+{
+    return 0;
+}
+static int file_new(BIO *bi)
+{
+    return 0;
+}
+static int file_free(BIO *a)
+{
+    return 0;
+}
+
+static const BIO_METHOD methods_filep = {
+    BIO_TYPE_FILE,
+    "FILE pointer",
+    /* TODO: Convert to new style write function */
+    bwrite_conv,
+    file_write,
+    /* TODO: Convert to new style read function */
+    bread_conv,
+    file_read,
+    file_puts,
+    file_gets,
+    file_ctrl,
+    file_new,
+    file_free,
+    NULL,
+};
+
+const BIO_METHOD *BIO_s_file(void)
+{
+    return &methods_filep;
+}
+
+BIO *BIO_new_file(const char *filename, const char *mode)
+{
+    return NULL;
+}
 
+# endif                         /* OPENSSL_NO_STDIO */
 
+#endif                          /* HEADER_BSS_FILE_C */