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/* $OpenBSD: sshbuf-io.c,v 1.2 2020/01/25 23:28:06 djm Exp $ */
/*
* Copyright (c) 2011 Damien Miller
*
* 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.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include "ssherr.h"
#include "sshbuf.h"
#include "atomicio.h"
/* Load a file from a fd into a buffer */
int
sshbuf_load_fd(int fd, struct sshbuf **blobp)
{
u_char buf[4096];
size_t len;
struct stat st;
int r;
struct sshbuf *blob;
*blobp = NULL;
if (fstat(fd, &st) == -1)
return SSH_ERR_SYSTEM_ERROR;
if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
st.st_size > SSHBUF_SIZE_MAX)
return SSH_ERR_INVALID_FORMAT;
if ((blob = sshbuf_new()) == NULL)
return SSH_ERR_ALLOC_FAIL;
for (;;) {
if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) {
if (errno == EPIPE)
break;
r = SSH_ERR_SYSTEM_ERROR;
goto out;
}
if ((r = sshbuf_put(blob, buf, len)) != 0)
goto out;
if (sshbuf_len(blob) > SSHBUF_SIZE_MAX) {
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
}
if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
st.st_size != (off_t)sshbuf_len(blob)) {
r = SSH_ERR_FILE_CHANGED;
goto out;
}
/* success */
*blobp = blob;
blob = NULL; /* transferred */
r = 0;
out:
explicit_bzero(buf, sizeof(buf));
sshbuf_free(blob);
return r;
}
int
sshbuf_load_file(const char *path, struct sshbuf **bufp)
{
int r, fd, oerrno;
*bufp = NULL;
if ((fd = open(path, O_RDONLY)) == -1)
return SSH_ERR_SYSTEM_ERROR;
if ((r = sshbuf_load_fd(fd, bufp)) != 0)
goto out;
/* success */
r = 0;
out:
oerrno = errno;
close(fd);
if (r != 0)
errno = oerrno;
return r;
}
int
sshbuf_write_file(const char *path, struct sshbuf *buf)
{
int fd, oerrno;
if ((fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1)
return SSH_ERR_SYSTEM_ERROR;
if (atomicio(vwrite, fd, sshbuf_mutable_ptr(buf),
sshbuf_len(buf)) != sshbuf_len(buf) || close(fd) != 0) {
oerrno = errno;
close(fd);
unlink(path);
errno = oerrno;
return SSH_ERR_SYSTEM_ERROR;
}
return 0;
}
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