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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2013-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sudoers.h>
#include <sudo_digest.h>
unsigned char *
sudo_filedigest(int fd, const char *file, unsigned int digest_type,
size_t *digest_len)
{
unsigned char *file_digest = NULL;
unsigned char buf[32 * 1024];
struct sudo_digest *dig = NULL;
FILE *fp = NULL;
size_t nread;
int fd2;
debug_decl(sudo_filedigest, SUDOERS_DEBUG_UTIL);
*digest_len = sudo_digest_getlen(digest_type);
if (*digest_len == 0) {
sudo_warnx(U_("unsupported digest type %u for %s"), digest_type, file);
debug_return_ptr(NULL);
}
if ((fd2 = dup(fd)) == -1) {
sudo_debug_printf(SUDO_DEBUG_INFO, "unable to dup %s: %s",
file, strerror(errno));
debug_return_ptr(NULL);
}
if ((fp = fdopen(fd2, "r")) == NULL) {
sudo_debug_printf(SUDO_DEBUG_INFO, "unable to fdopen %s: %s",
file, strerror(errno));
close(fd2);
goto bad;
}
if ((file_digest = malloc(*digest_len)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
if ((dig = sudo_digest_alloc(digest_type)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
sudo_digest_update(dig, buf, nread);
}
if (ferror(fp)) {
sudo_warnx(U_("%s: read error"), file);
goto bad;
}
sudo_digest_final(dig, file_digest);
sudo_digest_free(dig);
fclose(fp);
debug_return_ptr(file_digest);
bad:
sudo_digest_free(dig);
free(file_digest);
if (fp != NULL)
fclose(fp);
debug_return_ptr(NULL);
}
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