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

Source
/*
 * Copyright 1995-2025 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 = (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)
{
    int ret = 0;

    if (b->init && (in != NULL)) {
        if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
            ret = (int)UP_fwrite(in, inl, 1, b->ptr);
        else
            ret = (int)fwrite(in, 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' : '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
        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;
            *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_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: 2025-12-10 06:24

Line	Count	Source
1		/*
2		* Copyright 1995-2025 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	1	{
59	1	BIO *ret;
60	1	FILE *file = openssl_fopen(filename, mode);
61	1	int fp_flags = BIO_CLOSE;
62
63	1	if (strchr(mode, 'b') == NULL)
64	0	fp_flags \|= BIO_FP_TEXT;
65
66	1	if (file == NULL) {
67	1	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
68	1	"calling fopen(%s, %s)",
69	1	filename, mode);
70	1	if (errno == ENOENT
71	0	#ifdef ENXIO
72	1	\|\| errno == ENXIO
73	1	#endif
74	1	)
75	1	ERR_raise(ERR_LIB_BIO, BIO_R_NO_SUCH_FILE);
76	0	else
77	1	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
78	1	return NULL;
79	1	}
80	0	if ((ret = BIO_new(BIO_s_file())) == NULL) {
81	0	fclose(file);
82	0	return NULL;
83	0	}
84
85		/* we did fopen -> we disengage UPLINK */
86	0	BIO_clear_flags(ret, BIO_FLAGS_UPLINK_INTERNAL);
87	0	BIO_set_fp(ret, file, fp_flags);
88	0	return ret;
89	0	}
90
91		BIO BIO_new_fp(FILE stream, int close_flag)
92	0	{
93	0	BIO *ret;
94
95	0	if ((ret = BIO_new(BIO_s_file())) == NULL)
96	0	return NULL;
97
98		/* redundant flag, left for documentation purposes */
99	0	BIO_set_flags(ret, BIO_FLAGS_UPLINK_INTERNAL);
100	0	BIO_set_fp(ret, stream, close_flag);
101	0	return ret;
102	0	}
103
104		const BIO_METHOD *BIO_s_file(void)
105	0	{
106	0	return &methods_filep;
107	0	}
108
109		static int file_new(BIO *bi)
110	0	{
111	0	bi->init = 0;
112	0	bi->num = 0;
113	0	bi->ptr = NULL;
114	0	bi->flags = BIO_FLAGS_UPLINK_INTERNAL; /* default to UPLINK */
115	0	return 1;
116	0	}
117
118		static int file_free(BIO *a)
119	0	{
120	0	if (a == NULL)
121	0	return 0;
122	0	if (a->shutdown) {
123	0	if ((a->init) && (a->ptr != NULL)) {
124	0	if (a->flags & BIO_FLAGS_UPLINK_INTERNAL)
125	0	UP_fclose(a->ptr);
126	0	else
127	0	fclose(a->ptr);
128	0	a->ptr = NULL;
129	0	a->flags = BIO_FLAGS_UPLINK_INTERNAL;
130	0	}
131	0	a->init = 0;
132	0	}
133	0	return 1;
134	0	}
135
136		static int file_read(BIO b, char out, int outl)
137	0	{
138	0	int ret = 0;
139
140	0	if (b->init && (out != NULL)) {
141	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
142	0	ret = (int)UP_fread(out, 1, outl, b->ptr);
143	0	else
144	0	ret = (int)fread(out, 1, outl, (FILE *)b->ptr);
145	0	if (ret == 0
146	0	&& (b->flags & BIO_FLAGS_UPLINK_INTERNAL
147	0	? UP_ferror((FILE *)b->ptr)
148	0	: ferror((FILE *)b->ptr))) {
149	0	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
150	0	"calling fread()");
151	0	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
152	0	ret = -1;
153	0	}
154	0	}
155	0	return ret;
156	0	}
157
158		static int file_write(BIO b, const char in, int inl)
159	0	{
160	0	int ret = 0;
161
162	0	if (b->init && (in != NULL)) {
163	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
164	0	ret = (int)UP_fwrite(in, inl, 1, b->ptr);
165	0	else
166	0	ret = (int)fwrite(in, inl, 1, (FILE *)b->ptr);
167	0	if (ret)
168	0	ret = inl;
169		/* ret=fwrite(in,1,(int)inl,(FILE )b->ptr); /
170		/*
171		* according to Tim Hudson <tjh@openssl.org>, the commented out
172		* version above can cause 'inl' write calls under some stupid stdio
173		* implementations (VMS)
174		*/
175	0	}
176	0	return ret;
177	0	}
178
179		static long file_ctrl(BIO b, int cmd, long num, void ptr)
180	0	{
181	0	long ret = 1;
182	0	FILE fp = (FILE )b->ptr;
183	0	FILE **fpp;
184	0	char p[4];
185	0	int st;
186
187	0	switch (cmd) {
188	0	case BIO_C_FILE_SEEK:
189	0	case BIO_CTRL_RESET:
190	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
191	0	ret = (long)UP_fseek(b->ptr, num, 0);
192	0	else
193	0	ret = (long)fseek(fp, num, 0);
194	0	break;
195	0	case BIO_CTRL_EOF:
196	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
197	0	ret = (long)UP_feof(fp);
198	0	else
199	0	ret = (long)feof(fp);
200	0	break;
201	0	case BIO_C_FILE_TELL:
202	0	case BIO_CTRL_INFO:
203	0	if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
204	0	ret = UP_ftell(b->ptr);
205	0	else
206	0	ret = ftell(fp);
207	0	break;
208	0	case BIO_C_SET_FILE_PTR:
209	0	file_free(b);
210	0	b->shutdown = (int)num & BIO_CLOSE;
211	0	b->ptr = ptr;
212	0	b->init = 1;
213		#if BIO_FLAGS_UPLINK_INTERNAL != 0
214		#if defined(__MINGW32__) && defined(__MSVCRT__) && !defined(_IOB_ENTRIES)
215		#define _IOB_ENTRIES 20
216		#endif
217		/* Safety net to catch purely internal BIO_set_fp calls */
218		#if (defined(_MSC_VER) && _MSC_VER >= 1900) \|\| defined(__BORLANDC__)
219		if (ptr == stdin \|\| ptr == stdout \|\| ptr == stderr)
220		BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
221		#elif defined(_IOB_ENTRIES)
222		if ((size_t)ptr >= (size_t)stdin && (size_t)ptr < (size_t)(stdin + _IOB_ENTRIES))
223		BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
224		#endif
225		#endif
226		#ifdef UP_fsetmod
227		if (b->flags & BIO_FLAGS_UPLINK_INTERNAL)
228		UP_fsetmod(b->ptr, (char)((num & BIO_FP_TEXT) ? 't' : 'b'));
229		else
230		#endif
231	0	{
232		#if defined(OPENSSL_SYS_WINDOWS)
233		int fd = _fileno((FILE *)ptr);
234		if (num & BIO_FP_TEXT)
235		_setmode(fd, _O_TEXT);
236		else
237		_setmode(fd, _O_BINARY);
238		#elif defined(OPENSSL_SYS_MSDOS)
239		int fd = fileno((FILE *)ptr);
240		/* Set correct text/binary mode */
241		if (num & BIO_FP_TEXT)
242		_setmode(fd, _O_TEXT);
243		/* Dangerous to set stdin/stdout to raw (unless redirected) */
244		else {
245		if (fd == STDIN_FILENO \|\| fd == STDOUT_FILENO) {
246		if (isatty(fd) <= 0)
247		_setmode(fd, _O_BINARY);
248		} else
249		_setmode(fd, _O_BINARY);
250		}
251		#elif defined(OPENSSL_SYS_WIN32_CYGWIN)
252		int fd = fileno((FILE *)ptr);
253		if (!(num & BIO_FP_TEXT))
254		setmode(fd, O_BINARY);
255		#endif
256	0	}
257	0	break;
258	0	case BIO_C_SET_FILENAME:
259	0	file_free(b);
260	0	b->shutdown = (int)num & BIO_CLOSE;
261	0	if (num & BIO_FP_APPEND) {
262	0	if (num & BIO_FP_READ)
263	0	OPENSSL_strlcpy(p, "a+", sizeof(p));
264	0	else
265	0	OPENSSL_strlcpy(p, "a", sizeof(p));
266	0	} else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
267	0	OPENSSL_strlcpy(p, "r+", sizeof(p));
268	0	else if (num & BIO_FP_WRITE)
269	0	OPENSSL_strlcpy(p, "w", sizeof(p));
270	0	else if (num & BIO_FP_READ)
271	0	OPENSSL_strlcpy(p, "r", sizeof(p));
272	0	else {
273	0	ERR_raise(ERR_LIB_BIO, BIO_R_BAD_FOPEN_MODE);
274	0	ret = 0;
275	0	break;
276	0	}
277		#if defined(OPENSSL_SYS_MSDOS) \|\| defined(OPENSSL_SYS_WINDOWS)
278		if (!(num & BIO_FP_TEXT))
279		OPENSSL_strlcat(p, "b", sizeof(p));
280		else
281		OPENSSL_strlcat(p, "t", sizeof(p));
282		#elif defined(OPENSSL_SYS_WIN32_CYGWIN)
283		if (!(num & BIO_FP_TEXT))
284		OPENSSL_strlcat(p, "b", sizeof(p));
285		#endif
286	0	fp = openssl_fopen(ptr, p);
287	0	if (fp == NULL) {
288	0	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
289	0	"calling fopen(%s, %s)",
290	0	(const char *)ptr, p);
291	0	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
292	0	ret = 0;
293	0	break;
294	0	}
295	0	b->ptr = fp;
296	0	b->init = 1;
297		/* we did fopen -> we disengage UPLINK */
298	0	BIO_clear_flags(b, BIO_FLAGS_UPLINK_INTERNAL);
299	0	break;
300	0	case BIO_C_GET_FILE_PTR:
301		/* the ptr parameter is actually a FILE ** in this case. */
302	0	if (ptr != NULL) {
303	0	fpp = (FILE **)ptr;
304	0	fpp = (FILE )b->ptr;
305	0	}
306	0	break;
307	0	case BIO_CTRL_GET_CLOSE:
308	0	ret = (long)b->shutdown;
309	0	break;
310	0	case BIO_CTRL_SET_CLOSE:
311	0	b->shutdown = (int)num;
312	0	break;
313	0	case BIO_CTRL_FLUSH:
314	0	st = b->flags & BIO_FLAGS_UPLINK_INTERNAL
315	0	? UP_fflush(b->ptr)
316	0	: fflush((FILE *)b->ptr);
317	0	if (st == EOF) {
318	0	ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
319	0	"calling fflush()");
320	0	ERR_raise(ERR_LIB_BIO, ERR_R_SYS_LIB);
321	0	ret = 0;
322	0	}
323	0	break;
324	0	case BIO_CTRL_DUP:
325	0	ret = 1;
326	0	break;
327
328	0	case BIO_CTRL_WPENDING:
329	0	case BIO_CTRL_PENDING:
330	0	case BIO_CTRL_PUSH:
331	0	case BIO_CTRL_POP:
332	0	default:
333	0	ret = 0;
334	0	break;
335	0	}
336	0	return ret;
337	0	}
338
339		static int file_gets(BIO bp, char buf, int size)
340	0	{
341	0	int ret = 0;
342
343	0	buf[0] = '\0';
344	0	if (bp->flags & BIO_FLAGS_UPLINK_INTERNAL) {
345	0	if (!UP_fgets(buf, size, bp->ptr))
346	0	goto err;
347	0	} else {
348	0	if (!fgets(buf, size, (FILE *)bp->ptr))
349	0	goto err;
350	0	}
351	0	if (buf[0] != '\0')
352	0	ret = (int)strlen(buf);
353	0	err:
354	0	return ret;
355	0	}
356
357		static int file_puts(BIO bp, const char str)
358	0	{
359	0	int ret;
360	0	size_t n = strlen(str);
361
362	0	if (n > INT_MAX)
363	0	return -1;
364	0	ret = file_write(bp, str, (int)n);
365	0	return ret;
366	0	}
367
368		#else
369
370		static int file_write(BIO b, const char in, int inl)
371		{
372		return -1;
373		}
374		static int file_read(BIO b, char out, int outl)
375		{
376		return -1;
377		}
378		static int file_puts(BIO bp, const char str)
379		{
380		return -1;
381		}
382		static int file_gets(BIO bp, char buf, int size)
383		{
384		return 0;
385		}
386		static long file_ctrl(BIO b, int cmd, long num, void ptr)
387		{
388		return 0;
389		}
390		static int file_new(BIO *bi)
391		{
392		return 0;
393		}
394		static int file_free(BIO *a)
395		{
396		return 0;
397		}
398
399		static const BIO_METHOD methods_filep = {
400		BIO_TYPE_FILE,
401		"FILE pointer",
402		bwrite_conv,
403		file_write,
404		bread_conv,
405		file_read,
406		file_puts,
407		file_gets,
408		file_ctrl,
409		file_new,
410		file_free,
411		NULL, /* file_callback_ctrl */
412		};
413
414		const BIO_METHOD *BIO_s_file(void)
415		{
416		return &methods_filep;
417		}
418
419		BIO BIO_new_file(const char filename, const char *mode)
420		{
421		return NULL;
422		}
423
424		#endif /* OPENSSL_NO_STDIO */