#include <fcntl.h>
#include <sys/stat.h>
-#include "../src/guestfs_protocol.h"
+#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
{
int fd;
int r;
+ struct stat buf;
+
+ /* RHBZ#582484: Restrict touch to regular files. It's also OK
+ * here if the file does not exist, since we will create it.
+ */
+ CHROOT_IN;
+ r = lstat (path, &buf);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ if (errno != ENOENT) {
+ reply_with_perror ("lstat: %s", path);
+ return -1;
+ }
+ } else {
+ if (! S_ISREG (buf.st_mode)) {
+ reply_with_error ("%s: touch can only be used on a regular files", path);
+ return -1;
+ }
+ }
CHROOT_IN;
fd = open (path, O_WRONLY | O_CREAT | O_NOCTTY, 0666);
}
int
-do_exists (const char *path)
-{
- int r;
-
- CHROOT_IN;
- r = access (path, F_OK);
- CHROOT_OUT;
-
- return r == 0;
-}
-
-int
-do_is_file (const char *path)
-{
- int r;
- struct stat buf;
-
- CHROOT_IN;
- r = lstat (path, &buf);
- CHROOT_OUT;
-
- if (r == -1) {
- if (errno != ENOENT && errno != ENOTDIR) {
- reply_with_perror ("stat: %s", path);
- return -1;
- }
- else
- return 0; /* Not a file. */
- }
-
- return S_ISREG (buf.st_mode);
-}
-
-int
do_write_file (const char *path, const char *content, int size)
{
int fd;
return r;
}
-char *
-do_pread (const char *path, int count, int64_t offset, size_t *size_r)
+static char *
+pread_fd (int fd, int count, int64_t offset, size_t *size_r,
+ const char *display_path)
{
- int fd;
ssize_t r;
char *buf;
+ if (count < 0) {
+ reply_with_error ("count is negative");
+ close (fd);
+ return NULL;
+ }
+
+ if (offset < 0) {
+ reply_with_error ("offset is negative");
+ close (fd);
+ return NULL;
+ }
+
/* The actual limit on messages is smaller than this. This check
* just limits the amount of memory we'll try and allocate in the
* function. If the message is larger than the real limit, that
* will be caught later when we try to serialize the message.
*/
if (count >= GUESTFS_MESSAGE_MAX) {
- reply_with_error ("%s: count is too large for the protocol, use smaller reads", path);
- return NULL;
- }
-
- CHROOT_IN;
- fd = open (path, O_RDONLY);
- CHROOT_OUT;
-
- if (fd == -1) {
- reply_with_perror ("open: %s", path);
+ reply_with_error ("%s: count is too large for the protocol, use smaller reads", display_path);
+ close (fd);
return NULL;
}
r = pread (fd, buf, count, offset);
if (r == -1) {
- reply_with_perror ("pread: %s", path);
+ reply_with_perror ("pread: %s", display_path);
close (fd);
free (buf);
return NULL;
}
if (close (fd) == -1) {
- reply_with_perror ("close: %s", path);
+ reply_with_perror ("close: %s", display_path);
close (fd);
free (buf);
return NULL;
return buf;
}
-int
-do_pwrite (const char *path, const char *content, size_t size, int64_t offset)
+char *
+do_pread (const char *path, int count, int64_t offset, size_t *size_r)
{
int fd;
- ssize_t r;
CHROOT_IN;
- fd = open (path, O_WRONLY);
+ fd = open (path, O_RDONLY);
CHROOT_OUT;
if (fd == -1) {
reply_with_perror ("open: %s", path);
- return -1;
+ return NULL;
+ }
+
+ return pread_fd (fd, count, offset, size_r, path);
+}
+
+char *
+do_pread_device (const char *device, int count, int64_t offset, size_t *size_r)
+{
+ int fd = open (device, O_RDONLY);
+ if (fd == -1) {
+ reply_with_perror ("open: %s", device);
+ return NULL;
}
+ return pread_fd (fd, count, offset, size_r, device);
+}
+
+static int
+pwrite_fd (int fd, const char *content, size_t size, int64_t offset,
+ const char *display_path)
+{
+ ssize_t r;
+
r = pwrite (fd, content, size, offset);
if (r == -1) {
- reply_with_perror ("pwrite: %s", path);
+ reply_with_perror ("pwrite: %s", display_path);
close (fd);
return -1;
}
if (close (fd) == -1) {
- reply_with_perror ("close: %s", path);
+ reply_with_perror ("close: %s", display_path);
close (fd);
return -1;
}
return r;
}
+int
+do_pwrite (const char *path, const char *content, size_t size, int64_t offset)
+{
+ int fd;
+
+ if (offset < 0) {
+ reply_with_error ("offset is negative");
+ return -1;
+ }
+
+ CHROOT_IN;
+ fd = open (path, O_WRONLY);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return -1;
+ }
+
+ return pwrite_fd (fd, content, size, offset, path);
+}
+
+int
+do_pwrite_device (const char *device, const char *content, size_t size,
+ int64_t offset)
+{
+ if (offset < 0) {
+ reply_with_error ("offset is negative");
+ return -1;
+ }
+
+ int fd = open (device, O_WRONLY);
+ if (fd == -1) {
+ reply_with_perror ("open: %s", device);
+ return -1;
+ }
+
+ return pwrite_fd (fd, content, size, offset, device);
+}
+
/* This runs the 'file' command. */
char *
do_file (const char *path)
{
- char *out, *err;
- int r, freeit = 0;
- char *buf;
- int len;
+ char *buf = NULL;
+ const char *display_path = path;
- if (STREQLEN (path, "/dev/", 5))
- buf = (char *) path;
- else {
+ int is_dev = STRPREFIX (path, "/dev/");
+
+ if (!is_dev) {
buf = sysroot_path (path);
if (!buf) {
reply_with_perror ("malloc");
return NULL;
}
- freeit = 1;
+ path = buf;
+
+ /* For non-dev, check this is a regular file, else just return the
+ * file type as a string (RHBZ#582484).
+ */
+ struct stat statbuf;
+ if (lstat (path, &statbuf) == -1) {
+ reply_with_perror ("lstat: %s", display_path);
+ free (buf);
+ return NULL;
+ }
+
+ if (! S_ISREG (statbuf.st_mode)) {
+ char *ret;
+
+ free (buf);
+
+ if (S_ISDIR (statbuf.st_mode))
+ ret = strdup ("directory");
+ else if (S_ISCHR (statbuf.st_mode))
+ ret = strdup ("character device");
+ else if (S_ISBLK (statbuf.st_mode))
+ ret = strdup ("block device");
+ else if (S_ISFIFO (statbuf.st_mode))
+ ret = strdup ("FIFO");
+ else if (S_ISLNK (statbuf.st_mode))
+ ret = strdup ("symbolic link");
+ else if (S_ISSOCK (statbuf.st_mode))
+ ret = strdup ("socket");
+ else
+ ret = strdup ("unknown, not regular file");
+
+ if (ret == NULL)
+ reply_with_perror ("strdup");
+ return ret;
+ }
}
- /* file(1) manpage claims "file returns 0 on success, and non-zero on
- * error", but this is evidently not true. It always returns 0, in
- * every scenario I can think up. So check the target is readable
- * first.
+ /* Which flags to use? For /dev paths, follow links because
+ * /dev/VG/LV is a symbolic link.
*/
- if (access (buf, R_OK) == -1) {
- if (freeit) free (buf);
- reply_with_perror ("access: %s", path);
- return NULL;
- }
+ const char *flags = is_dev ? "-zbsL" : "-zb";
- r = command (&out, &err, "file", "-zbsL", buf, NULL);
- if (freeit) free (buf);
+ char *out, *err;
+ int r = command (&out, &err, "file", flags, path, NULL);
+ free (buf);
if (r == -1) {
free (out);
- reply_with_error ("%s: %s", path, err);
+ reply_with_error ("%s: %s", display_path, err);
free (err);
return NULL;
}
free (err);
/* We need to remove the trailing \n from output of file(1). */
- len = strlen (out);
- if (out[len-1] == '\n')
+ size_t len = strlen (out);
+ if (len > 0 && out[len-1] == '\n')
out[len-1] = '\0';
return out; /* caller frees */
git.annexia.org / libguestfs.git / blobdiff