/src/openssl/crypto/bio/bss_file.c

Source
/*
 * Copyright 1995-2026 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;
    int fp_flags = BIO_CLOSE;

    if (strchr(mode, 'b') == NULL)
        fp_flags |= BIO_FP_TEXT;

    if (filename == NULL) {
        ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
        return NULL;
    }

    file = openssl_fopen(filename, mode);
    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 != 0 && out != NULL && outl > 0) {
        if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
            ret = (int)UP_fread(out, 1, outl, b->ptr);
        else
            ret = (int)fread(out, 1, 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)
{
    size_t ret = 0;

    if (inl < INT_MAX && inl >= 0 && b->init && (in != NULL)) {
        if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
            ret = (int)UP_fwrite(in, 1, (size_t)inl, b->ptr);
        else
            ret = fwrite(in, 1, (size_t)inl, (FILE *)b->ptr);
    }

    return (int)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:
        /*
         * NOTE feof returns 0 if we're not in an eof condition
         * and a non-zero value if we are (i.e. any non-zero value
         * so we map the 0:non-0 return value here to 0:1 with a
         * double negation
         */
        if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
            ret = !!(long)UP_feof(fp);
        else
            ret = !!(long)feof(fp);
#if defined(OPENSSL_SYS_WINDOWS)
        /*
         * Windows gives us an extra issue to contend with.
         * In windows feof may return 0 if it is passed an invalid
         * stream.  In this event, feof sets errno to EINVAL.
         * Check for that here, and set ret to -EINVAL if its the case.
         */
        if (ret == 0 && errno == EINVAL)
            ret = -EINVAL;
#endif
        break;
    case BIO_C_FILE_TELL:
    case BIO_CTRL_INFO:
        if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
            ret = UP_ftell(b->ptr);
        else {
#if defined(OPENSSL_SYS_WINDOWS)
            /*
             * On Windows, for non-seekable files (stdin), ftell() is undefined.
             */
            if (GetFileType((HANDLE)_get_osfhandle(_fileno(fp))) != FILE_TYPE_DISK)
                ret = -1;
            else
                ret = ftell(fp);
#else
            ret = ftell(fp);
#endif
        }
        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' : '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_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 {
            ERR_raise(ERR_LIB_BIO, BIO_R_BAD_FOPEN_MODE);
            ret = 0;
            break;
        }
#if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS)
        if (!(num & BIO_FP_TEXT))
            OPENSSL_strlcat(p, "b", sizeof(p));
        else
            OPENSSL_strlcat(p, "t", sizeof(p));
#elif defined(OPENSSL_SYS_WIN32_CYGWIN)
        if (!(num & BIO_FP_TEXT))
            OPENSSL_strlcat(p, "b", sizeof(p));
#endif
        if (ptr == NULL) {
            ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
            ret = 0;
            break;
        }
        fp = openssl_fopen(ptr, p);
        if (fp == NULL) {
            ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
                "calling fopen(%s, %s)",
                (const char *)ptr, p);
            ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
            ret = 0;
            break;
        }
        b->ptr = fp;
        b->init = 1;
        /* we did fopen -> we disengage UPLINK */
        BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
        break;
    case BIO_C_GET_FILE_PTR:
        /* the ptr parameter is actually a FILE ** in this case. */
        if (ptr != NULL) {
            fpp = (FILE **)ptr;
            if (BIO_FLAGS_UPLINK_INTERNAL == 0
                || b->flags & BIO_FLAGS_UPLINK_INTERNAL) {
                *fpp = (FILE *)b->ptr;
            } else { /* avoid returning internal FILE * to the app */
                *fpp = NULL;
                ret = 0;
            }
        }
        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_INTERNAL
            ? UP_fflush(b->ptr)
            : fflush((FILE *)b->ptr);
        if (st == EOF) {
            ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
                "calling fflush()");
            ERR_raise(ERR_LIB_BIO, 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_INTERNAL) {
        if (!UP_fgets(buf, size, bp->ptr))
            goto err;
    } else {
        if (!fgets(buf, size, (FILE *)bp->ptr))
            goto err;
    }
    if (buf[0] != '\0')
        ret = (int)strlen(buf);
err:
    return ret;
}

static int file_puts(BIO *bp, const char *str)
{
    int ret;
    size_t n = strlen(str);

    if (n > INT_MAX)
        return -1;
    ret = file_write(bp, str, (int)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",
    bwrite_conv,
    file_write,
    bread_conv,
    file_read,
    file_puts,
    file_gets,
    file_ctrl,
    file_new,
    file_free,
    NULL, /* file_callback_ctrl */
};

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 */

Coverage Report

Created: 2026-07-19 06:36

Line	Count	Source
1		/*
2		* Copyright 1995-2026 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#if defined(__linux) \|\| defined(__sun) \|\| defined(__hpux)
11		/*
12		* Following definition aliases fopen to fopen64 on above mentioned
13		* platforms. This makes it possible to open and sequentially access files
14		* larger than 2GB from 32-bit application. It does not allow one to traverse
15		* them beyond 2GB with fseek/ftell, but on the other hand no 32-bit
16		* platform permits that, not with fseek/ftell. Not to mention that breaking
17		* 2GB limit for seeking would require surgery to our API. But sequential
18		* access suffices for practical cases when you can run into large files,
19		* such as fingerprinting, so we can let API alone. For reference, the list
20		* of 32-bit platforms which allow for sequential access of large files
21		* without extra "magic" comprise *BSD, Darwin, IRIX...
22		*/
23		#ifndef _FILE_OFFSET_BITS
24		#define _FILE_OFFSET_BITS 64
25		#endif
26		#endif
27
28		#include <stdio.h>
29		#include <errno.h>
30		#include "bio_local.h"
31		#include <openssl/err.h>
32
33		#if !defined(OPENSSL_NO_STDIO)
34
35		static int file_write(BIO h, const char buf, int num);
36		static int file_read(BIO h, char buf, int size);
37		static int file_puts(BIO h, const char str);
38		static int file_gets(BIO h, char str, int size);
39		static long file_ctrl(BIO h, int cmd, long arg1, void arg2);
40		static int file_new(BIO *h);
41		static int file_free(BIO *data);
42		static const BIO_METHOD methods_filep = {
43		BIO_TYPE_FILE,
44		"FILE pointer",
45		bwrite_conv,
46		file_write,
47		bread_conv,
48		file_read,
49		file_puts,
50		file_gets,
51		file_ctrl,
52		file_new,
53		file_free,
54		NULL, /* file_callback_ctrl */
55		};
56
57		BIO BIO_new_file(const char filename, const char *mode)
58	15	{
59	15	BIO *ret;
60	15	FILE *file;
61	15	int fp_flags = BIO_CLOSE;
62
63	15	if (strchr(mode, 'b') == NULL)
64	0	fp_flags \|= BIO_FP_TEXT;
65
66	15	if (filename == NULL) {
67	0	ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
68	0	return NULL;
69	0	}
70
71	15	file = openssl_fopen(filename, mode);
72	15	if (file == NULL) {
73	15	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
74	15	"calling fopen(%s, %s)",
75	15	filename, mode);
76	15	if (errno == ENOENT
77	0	#ifdef ENXIO
78	15	\|\| errno == ENXIO
79	15	#endif
80	15	)
81	15	ERR_raise(ERR_LIB_BIO, BIO_R_NO_SUCH_FILE);
82	0	else
83	15	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
84	15	return NULL;
85	15	}
86	0	if ((ret = BIO_new(BIO_s_file())) == NULL) {
87	0	fclose(file);
88	0	return NULL;
89	0	}
90
91		/* we did fopen -> we disengage UPLINK */
92	0	BIO_clear_flags(ret, BIO_FLAGS_UPLINK_INTERNAL);
93	0	BIO_set_fp(ret, file, fp_flags);
94	0	return ret;
95	0	}
96
97		BIO BIO_new_fp(FILE stream, int close_flag)
98	0	{
99	0	BIO *ret;
100
101	0	if ((ret = BIO_new(BIO_s_file())) == NULL)
102	0	return NULL;
103
104		/* redundant flag, left for documentation purposes */
105	0	BIO_set_flags(ret, BIO_FLAGS_UPLINK_INTERNAL);
106	0	BIO_set_fp(ret, stream, close_flag);
107	0	return ret;
108	0	}
109
110		const BIO_METHOD *BIO_s_file(void)
111	0	{
112	0	return &methods_filep;
113	0	}
114
115		static int file_new(BIO *bi)
116	0	{
117	0	bi->init = 0;
118	0	bi->num = 0;
119	0	bi->ptr = NULL;
120	0	bi->flags = BIO_FLAGS_UPLINK_INTERNAL; /* default to UPLINK */
121	0	return 1;
122	0	}
123
124		static int file_free(BIO *a)
125	0	{
126	0	if (a == NULL)
127	0	return 0;
128	0	if (a->shutdown) {
129	0	if ((a->init) && (a->ptr != NULL)) {
130	0	if (a->flags & BIO_FLAGS_UPLINK_INTERNAL)
131	0	UP_fclose(a->ptr);
132	0	else
133	0	fclose(a->ptr);
134	0	a->ptr = NULL;
135	0	a->flags = BIO_FLAGS_UPLINK_INTERNAL;
136	0	}
137	0	a->init = 0;
138	0	}
139	0	return 1;
140	0	}
141
142		static int file_read(BIO b, char out, int outl)
143	0	{
144	0	int ret = 0;
145
146	0	if (b->init != 0 && out != NULL && outl > 0) {
147	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
148	0	ret = (int)UP_fread(out, 1, outl, b->ptr);
149	0	else
150	0	ret = (int)fread(out, 1, outl, (FILE *)b->ptr);
151	0	if (ret == 0
152	0	&& (b->flags & BIO_FLAGS_UPLINK_INTERNAL
153	0	? UP_ferror((FILE *)b->ptr)
154	0	: ferror((FILE *)b->ptr))) {
155	0	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
156	0	"calling fread()");
157	0	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
158	0	ret = -1;
159	0	}
160	0	}
161	0	return ret;
162	0	}
163
164		static int file_write(BIO b, const char in, int inl)
165	0	{
166	0	size_t ret = 0;
167
168	0	if (inl < INT_MAX && inl >= 0 && b->init && (in != NULL)) {
169	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
170	0	ret = (int)UP_fwrite(in, 1, (size_t)inl, b->ptr);
171	0	else
172	0	ret = fwrite(in, 1, (size_t)inl, (FILE *)b->ptr);
173	0	}
174
175	0	return (int)ret;
176	0	}
177
178		static long file_ctrl(BIO b, int cmd, long num, void ptr)
179	0	{
180	0	long ret = 1;
181	0	FILE fp = (FILE )b->ptr;
182	0	FILE **fpp;
183	0	char p[4];
184	0	int st;
185
186	0	switch (cmd) {
187	0	case BIO_C_FILE_SEEK:
188	0	case BIO_CTRL_RESET:
189	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
190	0	ret = (long)UP_fseek(b->ptr, num, 0);
191	0	else
192	0	ret = (long)fseek(fp, num, 0);
193	0	break;
194	0	case BIO_CTRL_EOF:
195		/*
196		* NOTE feof returns 0 if we're not in an eof condition
197		* and a non-zero value if we are (i.e. any non-zero value
198		* so we map the 0:non-0 return value here to 0:1 with a
199		* double negation
200		*/
201	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
202	0	ret = !!(long)UP_feof(fp);
203	0	else
204	0	ret = !!(long)feof(fp);
205		#if defined(OPENSSL_SYS_WINDOWS)
206		/*
207		* Windows gives us an extra issue to contend with.
208		* In windows feof may return 0 if it is passed an invalid
209		* stream. In this event, feof sets errno to EINVAL.
210		* Check for that here, and set ret to -EINVAL if its the case.
211		*/
212		if (ret == 0 && errno == EINVAL)
213		ret = -EINVAL;
214		#endif
215	0	break;
216	0	case BIO_C_FILE_TELL:
217	0	case BIO_CTRL_INFO:
218	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
219	0	ret = UP_ftell(b->ptr);
220	0	else {
221		#if defined(OPENSSL_SYS_WINDOWS)
222		/*
223		* On Windows, for non-seekable files (stdin), ftell() is undefined.
224		*/
225		if (GetFileType((HANDLE)_get_osfhandle(_fileno(fp))) != FILE_TYPE_DISK)
226		ret = -1;
227		else
228		ret = ftell(fp);
229		#else
230	0	ret = ftell(fp);
231	0	#endif
232	0	}
233	0	break;
234	0	case BIO_C_SET_FILE_PTR:
235	0	file_free(b);
236	0	b->shutdown = (int)num & BIO_CLOSE;
237	0	b->ptr = ptr;
238	0	b->init = 1;
239		#if BIO_FLAGS_UPLINK_INTERNAL != 0
240		#if defined(__MINGW32__) && defined(__MSVCRT__) && !defined(_IOB_ENTRIES)
241		#define _IOB_ENTRIES 20
242		#endif
243		/* Safety net to catch purely internal BIO_set_fp calls */
244		#if (defined(_MSC_VER) && _MSC_VER >= 1900) \|\| defined(__BORLANDC__)
245		if (ptr == stdin \|\| ptr == stdout \|\| ptr == stderr)
246		BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
247		#elif defined(_IOB_ENTRIES)
248		if ((size_t)ptr >= (size_t)stdin && (size_t)ptr < (size_t)(stdin + _IOB_ENTRIES))
249		BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
250		#endif
251		#endif
252		#ifdef UP_fsetmod
253		if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
254		UP_fsetmod(b->ptr, (char)((num & BIO_FP_TEXT) ? 't' : 'b'));
255		else
256		#endif
257	0	{
258		#if defined(OPENSSL_SYS_WINDOWS)
259		int fd = _fileno((FILE *)ptr);
260		if (num & BIO_FP_TEXT)
261		_setmode(fd, _O_TEXT);
262		else
263		_setmode(fd, _O_BINARY);
264		#elif defined(OPENSSL_SYS_MSDOS)
265		int fd = fileno((FILE *)ptr);
266		/* Set correct text/binary mode */
267		if (num & BIO_FP_TEXT)
268		_setmode(fd, _O_TEXT);
269		/* Dangerous to set stdin/stdout to raw (unless redirected) */
270		else {
271		if (fd == STDIN_FILENO \|\| fd == STDOUT_FILENO) {
272		if (isatty(fd) <= 0)
273		_setmode(fd, _O_BINARY);
274		} else
275		_setmode(fd, _O_BINARY);
276		}
277		#elif defined(OPENSSL_SYS_WIN32_CYGWIN)
278		int fd = fileno((FILE *)ptr);
279		if (!(num & BIO_FP_TEXT))
280		setmode(fd, O_BINARY);
281		#endif
282	0	}
283	0	break;
284	0	case BIO_C_SET_FILENAME:
285	0	file_free(b);
286	0	b->shutdown = (int)num & BIO_CLOSE;
287	0	if (num & BIO_FP_APPEND) {
288	0	if (num & BIO_FP_READ)
289	0	OPENSSL_strlcpy(p, "a+", sizeof(p));
290	0	else
291	0	OPENSSL_strlcpy(p, "a", sizeof(p));
292	0	} else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
293	0	OPENSSL_strlcpy(p, "r+", sizeof(p));
294	0	else if (num & BIO_FP_WRITE)
295	0	OPENSSL_strlcpy(p, "w", sizeof(p));
296	0	else if (num & BIO_FP_READ)
297	0	OPENSSL_strlcpy(p, "r", sizeof(p));
298	0	else {
299	0	ERR_raise(ERR_LIB_BIO, BIO_R_BAD_FOPEN_MODE);
300	0	ret = 0;
301	0	break;
302	0	}
303		#if defined(OPENSSL_SYS_MSDOS) \|\| defined(OPENSSL_SYS_WINDOWS)
304		if (!(num & BIO_FP_TEXT))
305		OPENSSL_strlcat(p, "b", sizeof(p));
306		else
307		OPENSSL_strlcat(p, "t", sizeof(p));
308		#elif defined(OPENSSL_SYS_WIN32_CYGWIN)
309		if (!(num & BIO_FP_TEXT))
310		OPENSSL_strlcat(p, "b", sizeof(p));
311		#endif
312	0	if (ptr == NULL) {
313	0	ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
314	0	ret = 0;
315	0	break;
316	0	}
317	0	fp = openssl_fopen(ptr, p);
318	0	if (fp == NULL) {
319	0	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
320	0	"calling fopen(%s, %s)",
321	0	(const char *)ptr, p);
322	0	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
323	0	ret = 0;
324	0	break;
325	0	}
326	0	b->ptr = fp;
327	0	b->init = 1;
328		/* we did fopen -> we disengage UPLINK */
329	0	BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
330	0	break;
331	0	case BIO_C_GET_FILE_PTR:
332		/* the ptr parameter is actually a FILE ** in this case. */
333	0	if (ptr != NULL) {
334	0	fpp = (FILE **)ptr;
335	0	if (BIO_FLAGS_UPLINK_INTERNAL == 0
336	0	\|\| b->flags & BIO_FLAGS_UPLINK_INTERNAL) {
337	0	fpp = (FILE )b->ptr;
338	0	} else { /* avoid returning internal FILE * to the app */
339	0	*fpp = NULL;
340	0	ret = 0;
341	0	}
342	0	}
343	0	break;
344	0	case BIO_CTRL_GET_CLOSE:
345	0	ret = (long)b->shutdown;
346	0	break;
347	0	case BIO_CTRL_SET_CLOSE:
348	0	b->shutdown = (int)num;
349	0	break;
350	0	case BIO_CTRL_FLUSH:
351	0	st = b->flags & BIO_FLAGS_UPLINK_INTERNAL
352	0	? UP_fflush(b->ptr)
353	0	: fflush((FILE *)b->ptr);
354	0	if (st == EOF) {
355	0	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
356	0	"calling fflush()");
357	0	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
358	0	ret = 0;
359	0	}
360	0	break;
361	0	case BIO_CTRL_DUP:
362	0	ret = 1;
363	0	break;
364
365	0	case BIO_CTRL_WPENDING:
366	0	case BIO_CTRL_PENDING:
367	0	case BIO_CTRL_PUSH:
368	0	case BIO_CTRL_POP:
369	0	default:
370	0	ret = 0;
371	0	break;
372	0	}
373	0	return ret;
374	0	}
375
376		static int file_gets(BIO bp, char buf, int size)
377	0	{
378	0	int ret = 0;
379
380	0	buf[0] = '\0';
381	0	if (bp->flags & BIO_FLAGS_UPLINK_INTERNAL) {
382	0	if (!UP_fgets(buf, size, bp->ptr))
383	0	goto err;
384	0	} else {
385	0	if (!fgets(buf, size, (FILE *)bp->ptr))
386	0	goto err;
387	0	}
388	0	if (buf[0] != '\0')
389	0	ret = (int)strlen(buf);
390	0	err:
391	0	return ret;
392	0	}
393
394		static int file_puts(BIO bp, const char str)
395	0	{
396	0	int ret;
397	0	size_t n = strlen(str);
398
399	0	if (n > INT_MAX)
400	0	return -1;
401	0	ret = file_write(bp, str, (int)n);
402	0	return ret;
403	0	}
404
405		#else
406
407		static int file_write(BIO b, const char in, int inl)
408		{
409		return -1;
410		}
411		static int file_read(BIO b, char out, int outl)
412		{
413		return -1;
414		}
415		static int file_puts(BIO bp, const char str)
416		{
417		return -1;
418		}
419		static int file_gets(BIO bp, char buf, int size)
420		{
421		return 0;
422		}
423		static long file_ctrl(BIO b, int cmd, long num, void ptr)
424		{
425		return 0;
426		}
427		static int file_new(BIO *bi)
428		{
429		return 0;
430		}
431		static int file_free(BIO *a)
432		{
433		return 0;
434		}
435
436		static const BIO_METHOD methods_filep = {
437		BIO_TYPE_FILE,
438		"FILE pointer",
439		bwrite_conv,
440		file_write,
441		bread_conv,
442		file_read,
443		file_puts,
444		file_gets,
445		file_ctrl,
446		file_new,
447		file_free,
448		NULL, /* file_callback_ctrl */
449		};
450
451		const BIO_METHOD *BIO_s_file(void)
452		{
453		return &methods_filep;
454		}
455
456		BIO BIO_new_file(const char filename, const char *mode)
457		{
458		return NULL;
459		}
460
461		#endif /* OPENSSL_NO_STDIO */