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author | Miklos Szeredi <miklos@szeredi.hu> | 2001-11-07 12:09:43 +0000 |
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committer | Miklos Szeredi <miklos@szeredi.hu> | 2001-11-07 12:09:43 +0000 |
commit | 97c61e98b4cb4115c5d1191edefdab125a9e16fd (patch) | |
tree | b67b00056e2bf76ef5019b81817b3e1817e99427 /example/fusexmp.c | |
parent | 2df1c04f30802df9a23a19e22042884430c429d2 (diff) | |
download | android_external_fuse-97c61e98b4cb4115c5d1191edefdab125a9e16fd.tar.gz android_external_fuse-97c61e98b4cb4115c5d1191edefdab125a9e16fd.tar.bz2 android_external_fuse-97c61e98b4cb4115c5d1191edefdab125a9e16fd.zip |
build with automake
Diffstat (limited to 'example/fusexmp.c')
-rw-r--r-- | example/fusexmp.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/example/fusexmp.c b/example/fusexmp.c new file mode 100644 index 0000000..b00039d --- /dev/null +++ b/example/fusexmp.c @@ -0,0 +1,410 @@ +#ifdef linux +/* For pread()/pwrite() */ +#define _XOPEN_SOURCE 500 +#endif + +/* For setgroups() */ +#define _BSD_SOURCE + +#include <fuse.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <dirent.h> +#include <errno.h> +#include <signal.h> +#include <utime.h> +#include <fcntl.h> +#include <grp.h> +#include <sys/fsuid.h> + +static struct fuse *xmp_fuse; + +static int set_creds(struct fuse_cred *cred) +{ + int res; + + res = setfsuid(cred->uid); + if(res == -1) + return -errno; + + res = setfsgid(cred->gid); + if(res == -1) + return -errno; + + return 0; +} + +static void restore_creds() +{ + setfsuid(getuid()); + setfsgid(getgid()); +} + +static int xmp_getattr(struct fuse_cred *cred, const char *path, + struct stat *stbuf) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = lstat(path, stbuf); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_readlink(struct fuse_cred *cred, const char *path, char *buf, + size_t size) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = readlink(path, buf, size - 1); + restore_creds(); + if(res == -1) + return -errno; + + buf[res] = '\0'; + return 0; +} + + +static int xmp_getdir(struct fuse_cred *cred, const char *path, fuse_dirh_t h, + fuse_dirfil_t filler) +{ + DIR *dp; + struct dirent *de; + int res; + + res = set_creds(cred); + if(res) + return res; + dp = opendir(path); + restore_creds(); + if(dp == NULL) + return -errno; + + while((de = readdir(dp)) != NULL) { + res = filler(h, de->d_name, de->d_type); + if(res != 0) + break; + } + + closedir(dp); + return res; +} + +static int xmp_mknod(struct fuse_cred *cred, const char *path, mode_t mode, + dev_t rdev) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = mknod(path, mode, rdev); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_mkdir(struct fuse_cred *cred, const char *path, mode_t mode) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = mkdir(path, mode); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_unlink(struct fuse_cred *cred, const char *path) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = unlink(path); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_rmdir(struct fuse_cred *cred, const char *path) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = rmdir(path); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_symlink(struct fuse_cred *cred, const char *from, + const char *to) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = symlink(from, to); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_rename(struct fuse_cred *cred, const char *from, const char *to) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = rename(from, to); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_link(struct fuse_cred *cred, const char *from, const char *to) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = link(from, to); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_chmod(struct fuse_cred *cred, const char *path, mode_t mode) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = chmod(path, mode); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_chown(struct fuse_cred *cred, const char *path, uid_t uid, + gid_t gid) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = lchown(path, uid, gid); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_truncate(struct fuse_cred *cred, const char *path, off_t size) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = truncate(path, size); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + +static int xmp_utime(struct fuse_cred *cred, const char *path, + struct utimbuf *buf) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = utime(path, buf); + restore_creds(); + if(res == -1) + return -errno; + + return 0; +} + + +static int xmp_open(struct fuse_cred *cred, const char *path, int flags) +{ + int res; + + res = set_creds(cred); + if(res) + return res; + res = open(path, flags); + restore_creds(); + if(res == -1) + return -errno; + + close(res); + return 0; +} + +static int xmp_read(struct fuse_cred *cred, const char *path, char *buf, + size_t size, off_t offset) +{ + int fd; + int res; + + res = set_creds(cred); + if(res) + return res; + fd = open(path, O_RDONLY); + restore_creds(); + if(fd == -1) + return -errno; + + res = pread(fd, buf, size, offset); + if(res == -1) + res = -errno; + + close(fd); + return res; +} + +static int xmp_write(struct fuse_cred *cred, const char *path, const char *buf, + size_t size, off_t offset) +{ + int fd; + int res; + + res = set_creds(cred); + if(res) + return res; + fd = open(path, O_WRONLY); + restore_creds(); + if(fd == -1) + return -errno; + + res = pwrite(fd, buf, size, offset); + if(res == -1) + res = -errno; + + close(fd); + return res; +} + +static void exit_handler() +{ + exit(0); +} + +static void set_signal_handlers() +{ + struct sigaction sa; + + sa.sa_handler = exit_handler; + sigemptyset(&(sa.sa_mask)); + sa.sa_flags = 0; + + if (sigaction(SIGHUP, &sa, NULL) == -1 || + sigaction(SIGINT, &sa, NULL) == -1 || + sigaction(SIGTERM, &sa, NULL) == -1) { + + perror("Cannot set exit signal handlers"); + exit(1); + } + + sa.sa_handler = SIG_IGN; + + if(sigaction(SIGPIPE, &sa, NULL) == -1) { + perror("Cannot set ignored signals"); + exit(1); + } +} + +static void cleanup() +{ + fuse_unmount(xmp_fuse); + fuse_destroy(xmp_fuse); +} + +static struct fuse_operations xmp_oper = { + getattr: xmp_getattr, + readlink: xmp_readlink, + getdir: xmp_getdir, + mknod: xmp_mknod, + mkdir: xmp_mkdir, + symlink: xmp_symlink, + unlink: xmp_unlink, + rmdir: xmp_rmdir, + rename: xmp_rename, + link: xmp_link, + chmod: xmp_chmod, + chown: xmp_chown, + truncate: xmp_truncate, + utime: xmp_utime, + open: xmp_open, + read: xmp_read, + write: xmp_write, +}; + +int main(int argc, char *argv[]) +{ + int res; + if(argc != 2) { + fprintf(stderr, "usage: %s mount_dir\n", argv[0]); + exit(1); + } + + set_signal_handlers(); + atexit(cleanup); + setgroups(0, NULL); + + xmp_fuse = fuse_new(0,0); + res = fuse_mount(xmp_fuse, argv[1]); + if(res == -1) + exit(1); + + fuse_set_operations(xmp_fuse, &xmp_oper); + + fuse_loop(xmp_fuse); + + return 0; +} |