A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* 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
*/
#include <stdio.h>
#include <errno.h>
#include "bio_lcl.h"
#if defined(OPENSSL_NO_POSIX_IO)
/*
* Dummy placeholder for BIO_s_fd...
*/
BIO *BIO_new_fd(int fd, int close_flag)
{
return NULL;
}
int BIO_fd_non_fatal_error(int err)
{
return 0;
}
int BIO_fd_should_retry(int i)
{
return 0;
}
const BIO_METHOD *BIO_s_fd(void)
{
return NULL;
}
#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...
*/
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 const BIO_METHOD methods_fdp = {
BIO_TYPE_FD, "file descriptor",
fd_write,
fd_read,
fd_puts,
fd_gets,
fd_ctrl,
fd_new,
fd_free,
NULL,
};
const 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();
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