openssl/crypto/bio/bss_fd.c

/* crypto/bio/bss_fd.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>
#define USE_SOCKETS
#include "cryptlib.h"

#if defined(OPENSSL_NO_POSIX_IO)
/*
 * One can argue that one should implement dummy placeholder for
 * BIO_s_fd here...
 */
#else
/*
 * As for unconditional usage of "UPLINK" interface in this module.
 * Trouble is that unlike Unix file descriptors [which are indexes
 * in kernel-side per-process table], corresponding descriptors on
 * platforms which require "UPLINK" interface seem to be indexes
 * in a user-land, non-global table. Well, in fact they are indexes
 * in stdio _iob[], and recall that _iob[] was the very reason why
 * "UPLINK" interface was introduced in first place. But one way on
 * another. Neither libcrypto or libssl use this BIO meaning that
 * file descriptors can only be provided by application. Therefore
 * "UPLINK" calls are due...
 */
# include "bio_lcl.h"

static int fd_write(BIO *h, const char *buf, int num);
static int fd_read(BIO *h, char *buf, int size);
static int fd_puts(BIO *h, const char *str);
static int fd_gets(BIO *h, char *buf, int size);
static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int fd_new(BIO *h);
static int fd_free(BIO *data);
int BIO_fd_should_retry(int s);

static BIO_METHOD methods_fdp = {
    BIO_TYPE_FD, "file descriptor",
    fd_write,
    fd_read,
    fd_puts,
    fd_gets,
    fd_ctrl,
    fd_new,
    fd_free,
    NULL,
};

BIO_METHOD *BIO_s_fd(void)
{
    return (&methods_fdp);
}

BIO *BIO_new_fd(int fd, int close_flag)
{
    BIO *ret;
    ret = BIO_new(BIO_s_fd());
    if (ret == NULL)
        return (NULL);
    BIO_set_fd(ret, fd, close_flag);
    return (ret);
}

static int fd_new(BIO *bi)
{
    bi->init = 0;
    bi->num = -1;
    bi->ptr = NULL;
    bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */
    return (1);
}

static int fd_free(BIO *a)
{
    if (a == NULL)
        return (0);
    if (a->shutdown) {
        if (a->init) {
            UP_close(a->num);
        }
        a->init = 0;
        a->flags = BIO_FLAGS_UPLINK;
    }
    return (1);
}

static int fd_read(BIO *b, char *out, int outl)
{
    int ret = 0;

    if (out != NULL) {
        clear_sys_error();
        ret = UP_read(b->num, out, outl);
        BIO_clear_retry_flags(b);
        if (ret <= 0) {
            if (BIO_fd_should_retry(ret))
                BIO_set_retry_read(b);
        }
    }
    return (ret);
}

static int fd_write(BIO *b, const char *in, int inl)
{
    int ret;
    clear_sys_error();
    ret = UP_write(b->num, in, inl);
    BIO_clear_retry_flags(b);
    if (ret <= 0) {
        if (BIO_fd_should_retry(ret))
            BIO_set_retry_write(b);
    }
    return (ret);
}

static long fd_ctrl(BIO *b, int cmd, long num, void *ptr)
{
    long ret = 1;
    int *ip;

    switch (cmd) {
    case BIO_CTRL_RESET:
        num = 0;
    case BIO_C_FILE_SEEK:
        ret = (long)UP_lseek(b->num, num, 0);
        break;
    case BIO_C_FILE_TELL:
    case BIO_CTRL_INFO:
        ret = (long)UP_lseek(b->num, 0, 1);
        break;
    case BIO_C_SET_FD:
        fd_free(b);
        b->num = *((int *)ptr);
        b->shutdown = (int)num;
        b->init = 1;
        break;
    case BIO_C_GET_FD:
        if (b->init) {
            ip = (int *)ptr;
            if (ip != NULL)
                *ip = b->num;
            ret = b->num;
        } else
            ret = -1;
        break;
    case BIO_CTRL_GET_CLOSE:
        ret = b->shutdown;
        break;
    case BIO_CTRL_SET_CLOSE:
        b->shutdown = (int)num;
        break;
    case BIO_CTRL_PENDING:
    case BIO_CTRL_WPENDING:
        ret = 0;
        break;
    case BIO_CTRL_DUP:
    case BIO_CTRL_FLUSH:
        ret = 1;
        break;
    default:
        ret = 0;
        break;
    }
    return (ret);
}

static int fd_puts(BIO *bp, const char *str)
{
    int n, ret;

    n = strlen(str);
    ret = fd_write(bp, str, n);
    return (ret);
}

static int fd_gets(BIO *bp, char *buf, int size)
{
    int ret = 0;
    char *ptr = buf;
    char *end = buf + size - 1;

    while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
        ptr++;

    ptr[0] = '\0';

    if (buf[0] != '\0')
        ret = strlen(buf);
    return (ret);
}

int BIO_fd_should_retry(int i)
{
    int err;

    if ((i == 0) || (i == -1)) {
        err = get_last_sys_error();

# if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps
                                       * not? Ben 4/1/99 */
        if ((i == -1) && (err == 0))
            return (1);
# endif

        return (BIO_fd_non_fatal_error(err));
    }
    return (0);
}

int BIO_fd_non_fatal_error(int err)
{
    switch (err) {

# ifdef EWOULDBLOCK
#  ifdef WSAEWOULDBLOCK
#   if WSAEWOULDBLOCK != EWOULDBLOCK
    case EWOULDBLOCK:
#   endif
#  else
    case EWOULDBLOCK:
#  endif
# endif

# if defined(ENOTCONN)
    case ENOTCONN:
# endif

# ifdef EINTR
    case EINTR:
# endif

# ifdef EAGAIN
#  if EWOULDBLOCK != EAGAIN
    case EAGAIN:
#  endif
# endif

# ifdef EPROTO
    case EPROTO:
# endif

# ifdef EINPROGRESS
    case EINPROGRESS:
# endif

# ifdef EALREADY
    case EALREADY:
# endif
        return (1);
        /* break; */
    default:
        break;
    }
    return (0);
}
#endif