/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <locale.h>
#include <cryptoutil.h>
/*
* Read file into buffer. Used to read raw key data or initialization
* vector data. Buffer must be freed by caller using free().
*
* If file is a regular file, entire file is read and dlen is set
* to the number of bytes read. Otherwise, dlen should first be set
* to the number of bytes requested and will be reset to actual number
* of bytes returned.
*
* Return 0 on success and errno on error.
*/
int
pkcs11_read_data(char *filename, void **dbuf, size_t *dlen)
{
int fd = -1;
struct stat statbuf;
boolean_t plain_file;
void *filebuf = NULL;
size_t filesize = 0;
int ret = 0;
if (filename == NULL || dbuf == NULL || dlen == NULL)
return (-1);
if ((fd = open(filename, O_RDONLY | O_NONBLOCK)) == -1) {
ret = errno;
cryptoerror(LOG_STDERR, gettext("cannot open %s"), filename);
goto error;
}
if (fstat(fd, &statbuf) == -1) {
ret = errno;
cryptoerror(LOG_STDERR, gettext("cannot stat %s"), filename);
goto error;
}
if (S_ISREG(statbuf.st_mode)) {
/* read the entire regular file */
filesize = statbuf.st_size;
plain_file = B_TRUE;
} else {
/* read requested bytes from special file */
filesize = *dlen;
plain_file = B_FALSE;
}
if (filesize == 0) {
/*
* for decrypt this is an error; for digest this is ok;
* make it ok here but also set dbuf = NULL and dlen = 0
* to indicate there was no data to read and caller can
* retranslate that to an error if it wishes.
*/
(void) close(fd);
*dbuf = NULL;
*dlen = 0;
return (0);
}
if ((filebuf = malloc(filesize)) == NULL) {
ret = errno;
cryptoerror(LOG_STDERR, gettext("malloc: %s"), strerror(ret));
goto error;
}
if (plain_file) {
/* either it got read or it didn't */
if (read(fd, filebuf, filesize) != filesize) {
ret = errno;
cryptoerror(LOG_STDERR,
gettext("error reading file %s: %s"), filename,
strerror(ret));
goto error;
}
} else {
/* reading from special file may need some coaxing */
char *marker = (char *)filebuf;
size_t left = filesize;
ssize_t nread;
for (/* */; left > 0; marker += nread, left -= nread) {
/* keep reading it's going well */
nread = read(fd, marker, left);
if (nread > 0 || (nread == 0 && errno == EINTR)) {
errno = 0;
continue;
}
/* might have to be good enough for caller */
if (nread == 0 && errno == EAGAIN)
break;
/* anything else is an error */
if (errno) {
ret = errno;
cryptoerror(LOG_STDERR,
gettext("error reading file %s: %s"),
filename, strerror(ret));
goto error;
}
}
/* reset to actual number of bytes read */
filesize -= left;
}
(void) close(fd);
*dbuf = filebuf;
*dlen = filesize;
return (0);
error:
if (filebuf != NULL) {
free(filebuf);
}
if (fd != -1)
(void) close(fd);
return (ret);
}