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/*
* Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
#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 one 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 "bio_local.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",
bwrite_conv,
file_write,
bread_conv,
file_read,
file_puts,
file_gets,
file_ctrl,
file_new,
file_free,
NULL, /* file_callback_ctrl */
};
BIO *BIO_new_file(const char *filename, const char *mode)
{
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) {
ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
"calling fopen(%s, %s)",
filename, mode);
if (errno == ENOENT
#ifdef ENXIO
|| errno == ENXIO
#endif
)
ERR_raise(ERR_LIB_BIO, BIO_R_NO_SUCH_FILE);
else
ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
return NULL;
}
if ((ret = BIO_new(BIO_s_file())) == NULL) {
fclose(file);
return NULL;
}
/* we did fopen -> we disengage UPLINK */
BIO_clear_flags(ret, BIO_FLAGS_UPLINK_INTERNAL);
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;
/* redundant flag, left for documentation purposes */
BIO_set_flags(ret, BIO_FLAGS_UPLINK_INTERNAL);
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_INTERNAL; /* 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_INTERNAL)
UP_fclose(a->ptr);
else
fclose(a->ptr);
a->ptr = NULL;
a->flags = BIO_FLAGS_UPLINK_INTERNAL;
}
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_INTERNAL)
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_INTERNAL
? UP_ferror((FILE *)b->ptr) : ferror((FILE *)b->ptr))) {
ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
"calling fread()");
ERR_raise(ERR_LIB_BIO, 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_INTERNAL)
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@openssl.org>, 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_INTERNAL)
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_INTERNAL)
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_INTERNAL)
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_INTERNAL!=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) || defined(__BORLANDC__)
if (ptr == stdin || ptr == stdout || ptr == stderr)
BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
# 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_INTERNAL);
# endif
# endif
# ifdef UP_fsetmod
if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
UP_fsetmod(b->ptr, (char)((num & BIO_FP_TEXT) ? 't' :
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