Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

284 lines (238 sloc) 6.565 kB
/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
struct write_cb_data {
int fd; /* file descriptor */
uint64_t written; /* bytes written so far */
};
static int
write_cb (void *data_vp, const void *buf, size_t len)
{
struct write_cb_data *data = data_vp;
int r;
r = xwrite (data->fd, buf, len);
if (r == -1)
return -1;
data->written += len;
if (progress_hint > 0)
notify_progress (data->written, progress_hint);
return 0;
}
/* Has one FileIn parameter. */
static int
upload (const char *filename, int flags, int64_t offset)
{
struct write_cb_data data = { .written = 0 };
int err, r, is_dev;
is_dev = STRPREFIX (filename, "/dev/");
if (!is_dev) CHROOT_IN;
data.fd = open (filename, flags, 0666);
if (!is_dev) CHROOT_OUT;
if (data.fd == -1) {
err = errno;
r = cancel_receive ();
errno = err;
reply_with_perror ("%s", filename);
return -1;
}
if (offset) {
if (lseek (data.fd, offset, SEEK_SET) == -1) {
err = errno;
r = cancel_receive ();
errno = err;
reply_with_perror ("lseek: %s", filename);
return -1;
}
}
r = receive_file (write_cb, &data.fd);
if (r == -1) { /* write error */
err = errno;
r = cancel_receive ();
errno = err;
reply_with_error ("write error: %s", filename);
close (data.fd);
return -1;
}
if (r == -2) { /* cancellation from library */
/* This error is ignored by the library since it initiated the
* cancel. Nevertheless we must send an error reply here.
*/
reply_with_error ("file upload cancelled");
close (data.fd);
return -1;
}
if (close (data.fd) == -1) {
reply_with_perror ("close: %s", filename);
return -1;
}
return 0;
}
/* Has one FileIn parameter. */
int
do_upload (const char *filename)
{
return upload (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY|O_CLOEXEC, 0);
}
/* Has one FileIn parameter. */
int
do_upload_offset (const char *filename, int64_t offset)
{
if (offset < 0) {
reply_with_perror ("%s: offset in file is negative", filename);
return -1;
}
return upload (filename, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, offset);
}
/* Has one FileOut parameter. */
int
do_download (const char *filename)
{
int fd, r, is_dev;
char buf[GUESTFS_MAX_CHUNK_SIZE];
is_dev = STRPREFIX (filename, "/dev/");
if (!is_dev) CHROOT_IN;
fd = open (filename, O_RDONLY|O_CLOEXEC);
if (!is_dev) CHROOT_OUT;
if (fd == -1) {
reply_with_perror ("%s", filename);
return -1;
}
/* Calculate the size of the file or device for notification messages. */
uint64_t total, sent = 0;
if (!is_dev) {
struct stat statbuf;
if (fstat (fd, &statbuf) == -1) {
reply_with_perror ("%s", filename);
close (fd);
return -1;
}
total = statbuf.st_size;
} else {
int64_t size = do_blockdev_getsize64 (filename);
if (size == -1) {
/* do_blockdev_getsize64 has already sent a reply. */
close (fd);
return -1;
}
total = (uint64_t) size;
}
/* Now we must send the reply message, before the file contents. After
* this there is no opportunity in the protocol to send any error
* message back. Instead we can only cancel the transfer.
*/
reply (NULL, NULL);
while ((r = read (fd, buf, sizeof buf)) > 0) {
if (send_file_write (buf, r) < 0) {
close (fd);
return -1;
}
sent += r;
notify_progress (sent, total);
}
if (r == -1) {
perror (filename);
send_file_end (1); /* Cancel. */
close (fd);
return -1;
}
if (close (fd) == -1) {
perror (filename);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
/* Has one FileOut parameter. */
int
do_download_offset (const char *filename, int64_t offset, int64_t size)
{
int fd, r, is_dev;
char buf[GUESTFS_MAX_CHUNK_SIZE];
if (offset < 0) {
reply_with_perror ("%s: offset in file is negative", filename);
return -1;
}
if (size < 0) {
reply_with_perror ("%s: size is negative", filename);
return -1;
}
uint64_t usize = (uint64_t) size;
is_dev = STRPREFIX (filename, "/dev/");
if (!is_dev) CHROOT_IN;
fd = open (filename, O_RDONLY|O_CLOEXEC);
if (!is_dev) CHROOT_OUT;
if (fd == -1) {
reply_with_perror ("%s", filename);
return -1;
}
if (offset) {
if (lseek (fd, offset, SEEK_SET) == -1) {
reply_with_perror ("lseek: %s", filename);
close (fd);
return -1;
}
}
uint64_t total = usize, sent = 0;
/* Now we must send the reply message, before the file contents. After
* this there is no opportunity in the protocol to send any error
* message back. Instead we can only cancel the transfer.
*/
reply (NULL, NULL);
while (usize > 0) {
r = read (fd, buf, usize > sizeof buf ? sizeof buf : usize);
if (r == -1) {
perror (filename);
send_file_end (1); /* Cancel. */
close (fd);
return -1;
}
if (r == 0)
/* The documentation leaves this case undefined. Currently we
* just read fewer bytes than requested.
*/
break;
if (send_file_write (buf, r) < 0) {
close (fd);
return -1;
}
sent += r;
usize -= r;
notify_progress (sent, total);
}
if (close (fd) == -1) {
perror (filename);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
Jump to Line
Something went wrong with that request. Please try again.