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Diffstat (limited to 'contrib/fuse-util/fusermount.c')
-rw-r--r--contrib/fuse-util/fusermount.c60
1 files changed, 48 insertions, 12 deletions
diff --git a/contrib/fuse-util/fusermount.c b/contrib/fuse-util/fusermount.c
index 39da9b6..4e7e4f9 100644
--- a/contrib/fuse-util/fusermount.c
+++ b/contrib/fuse-util/fusermount.c
@@ -19,6 +19,7 @@
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
+#include <limits.h>
#include <mntent.h>
#include <sys/wait.h>
#include <sys/stat.h>
@@ -28,6 +29,7 @@
#include <sys/utsname.h>
#include <sched.h>
+#define FUSE_DEVFD_ENV "_FUSE_DEVFD"
#define FUSE_COMMFD_ENV "_FUSE_COMMFD"
#define FUSE_DEV_OLD "/proc/fs/fuse/dev"
@@ -1016,8 +1018,36 @@ static int open_fuse_device(char **devp)
return -1;
}
+static int check_fuse_device(char *devfd, char **devp)
+{
+ int res;
+ char *devlink;
+
+ res = asprintf(&devlink, "/proc/self/fd/%s", devfd);
+ if (res == -1) {
+ fprintf(stderr, "%s: failed to allocate memory\n", progname);
+ return -1;
+ }
+
+ *devp = (char *) calloc(1, PATH_MAX + 1);
+ if (!*devp) {
+ fprintf(stderr, "%s: failed to allocate memory\n", progname);
+ free(devlink);
+ return -1;
+ }
+
+ res = readlink (devlink, *devp, PATH_MAX);
+ free (devlink);
+ if (res == -1) {
+ fprintf(stderr, "%s: specified fuse fd is invalid\n",
+ progname);
+ return -1;
+ }
+
+ return atoi(devfd);
+}
-static int mount_fuse(const char *mnt, const char *opts)
+static int mount_fuse(const char *mnt, const char *opts, char *devfd)
{
int res;
int fd;
@@ -1030,7 +1060,7 @@ static int mount_fuse(const char *mnt, const char *opts)
int currdir_fd = -1;
int mountpoint_fd = -1;
- fd = open_fuse_device(&dev);
+ fd = devfd ? check_fuse_device(devfd, &dev) : open_fuse_device(&dev);
if (fd == -1)
return -1;
@@ -1154,6 +1184,7 @@ int main(int argc, char *argv[])
static int unmount = 0;
static int lazy = 0;
static int quiet = 0;
+ char *devfd;
char *commfd;
int cfd;
const char *opts = "";
@@ -1242,21 +1273,26 @@ int main(int argc, char *argv[])
return 0;
}
- commfd = getenv(FUSE_COMMFD_ENV);
- if (commfd == NULL) {
- fprintf(stderr, "%s: old style mounting not supported\n",
- progname);
- exit(1);
+ devfd = getenv(FUSE_DEVFD_ENV);
+ if (devfd == NULL) {
+ commfd = getenv(FUSE_COMMFD_ENV);
+ if (commfd == NULL) {
+ fprintf(stderr, "%s: old style mounting not supported\n",
+ progname);
+ exit(1);
+ }
}
- fd = mount_fuse(mnt, opts);
+ fd = mount_fuse(mnt, opts, devfd);
if (fd == -1)
exit(1);
- cfd = atoi(commfd);
- res = send_fd(cfd, fd);
- if (res == -1)
- exit(1);
+ if (devfd == NULL) {
+ cfd = atoi(commfd);
+ res = send_fd(cfd, fd);
+ if (res == -1)
+ exit(1);
+ }
return 0;
}