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/*
* Copyright (c) 1997 - 2017 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* 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 above 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
*/
#include "krb5_locl.h"
#include "store-int.h"
typedef struct fd_storage {
int fd;
} fd_storage;
#define FD(S) (((fd_storage*)(S)->data)->fd)
static ssize_t
fd_fetch(krb5_storage * sp, void *data, size_t size)
{
char *cbuf = (char *)data;
ssize_t count;
size_t rem = size;
/* similar pattern to net_read() to support pipes */
while (rem > 0) {
count = read (FD(sp), cbuf, rem);
if (count < 0) {
if (errno == EINTR)
continue;
else if (rem == size)
return count;
else
return size - rem;
} else if (count == 0) {
return count;
}
cbuf += count;
rem -= count;
}
return size;
}
static ssize_t
fd_store(krb5_storage * sp, const void *data, size_t size)
{
const char *cbuf = (const char *)data;
ssize_t count;
size_t rem = size;
/* similar pattern to net_write() to support pipes */
while (rem > 0) {
count = write(FD(sp), cbuf, rem);
if (count < 0) {
if (errno == EINTR)
continue;
else
return size - rem;
}
cbuf += count;
rem -= count;
}
return size;
}
static off_t
fd_seek(krb5_storage * sp, off_t offset, int whence)
{
return lseek(FD(sp), offset, whence);
}
static int
fd_trunc(krb5_storage * sp, off_t offset)
{
off_t tmpoff;
if (ftruncate(FD(sp), offset) == -1)
return errno;
tmpoff = lseek(FD(sp), 0, SEEK_CUR);
if (tmpoff == -1)
return errno;
if (tmpoff > offset) {
tmpoff = lseek(FD(sp), offset, SEEK_SET);
if (tmpoff == -1)
return errno;
}
return 0;
}
static int
fd_sync(krb5_storage * sp)
{
if (fsync(FD(sp)) == -1)
return errno;
return 0;
}
static void
fd_free(krb5_storage * sp)
{
int save_errno = errno;
if (close(FD(sp)) == 0)
errno = save_errno;
}
/**
*
*
* @return A krb5_storage on success, or NULL on out of memory error.
*
* @ingroup krb5_storage
*
* @sa krb5_storage_emem()
* @sa krb5_storage_from_mem()
* @sa krb5_storage_from_readonly_mem()
* @sa krb5_storage_from_data()
* @sa krb5_storage_from_socket()
*/
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_fd(int fd_in)
{
krb5_storage *sp;
int saved_errno;
int fd;
#ifdef _MSC_VER
/*
* This function used to try to pass the input to
* _get_osfhandle() to test if the value is a HANDLE
* but this doesn't work because doing so throws an
* exception that will result in Watson being triggered
* to file a Windows Error Report.
*/
fd = _dup(fd_in);
#else
fd = dup(fd_in);
#endif
if (fd < 0)
return NULL;
errno = ENOMEM;
sp = malloc(sizeof(krb5_storage));
if (sp == NULL) {
saved_errno = errno;
close(fd);
errno = saved_errno;
return NULL;
}
errno = ENOMEM;
sp->data = malloc(sizeof(fd_storage));
if (sp->data == NULL) {
saved_errno = errno;
close(fd);
free(sp);
errno = saved_errno;
return NULL;
}
sp->flags = 0;
sp->eof_code = HEIM_ERR_EOF;
FD(sp) = fd;
sp->fetch = fd_fetch;
sp->store = fd_store;
sp->seek = fd_seek;
sp->trunc = fd_trunc;
sp->fsync = fd_sync;
sp->free = fd_free;
sp->max_alloc = UINT_MAX/8;
return sp;
}
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