int
opt_check_allowed_csv (Opt o, const char *csv)
{
Opt allow;
ListIterator itr;
char *item, *cpy, *p;
int ret = 0;
NP_ASSERT (o->magic == OPT_MAGIC);
allow = opt_create ();
opt_addf (allow, "%s", csv);
if (!(itr = list_iterator_create (o->list)))
msg_exit ("out of memory");
while ((item = list_next (itr))) {
if (!(cpy = strdup (item)))
msg_exit ("out of memory");
if ((p = strchr (cpy, '=')))
*p = '\0';
if (!opt_find (allow, cpy)) {
ret = 1;
free (cpy);
break;
}
free (cpy);
}
list_iterator_destroy (itr);
opt_destroy (allow);
return ret;
}
static char *
_parse_spec (char *spec, Opt o)
{
char *host, *aname;
if (!(host = strdup (spec)))
msg_exit ("out of memory");
if ((aname = strchr (host, ':')))
*aname++ = '\0';
if (strlen (host) == 0)
msg_exit ("no host specified");
if (!aname || strlen (aname) == 0)
; /* aname = opt_find (o, "aname"); */
else if (!opt_addf (o, "aname=%s", aname))
msg_exit ("you cannot have both -oaname and spec=host:aname");
return host;
}
/* Private or public mount? Only allow two modes:
* private: -ouname=USER,access=UID (uname could be root)
* public (dflt): -ouname=root,access=user
*/
static void
_parse_uname_access (Opt o)
{
char *uname = opt_find (o, "uname");
int uname_uid = -1;
char *access = opt_find (o, "access");
int access_uid = -1;
char *access_name = NULL;
struct passwd *pw;
if (uname) {
if (!(pw = getpwnam (uname)))
msg_exit ("could not look up uname='%s'", uname);
uname_uid = pw->pw_uid;
}
if (access && opt_scanf (o, "access=%d", &access_uid)) {
if (!(pw = getpwuid (access_uid)))
msg_exit ("could not look up access='%d'", access_uid);
if (!(access_name = strdup (pw->pw_name)))
msg_exit ("out of memory");
}
if (!uname && !access) {
opt_addf (o, "uname=%s", "root");
opt_addf (o, "access=%s", "user");
} else if (uname && !access) {
if (uname_uid == 0)
opt_addf (o, "access=%s", "user");
else
opt_addf (o, "access=%d", uname_uid);
} else if (!uname && access) {
if (strcmp (access, "user") == 0)
opt_addf (o, "uname=%s", "root");
else if (access_name) /* access=<uid> */
opt_addf (o, "uname=%s", access_name);
else
msg_exit ("unsupported -oaccess=%s", access);
} else { /* if (uname && access) */
if (strcmp (access, "user") == 0) {
if (uname_uid != 0)
msg_exit ("-oaccess=user can only be used with -ouname=root");
} else if (access_name) { /* access=<uid> */
if (uname_uid != access_uid)
msg_exit ("-oaccess=<uid> requires matching -ouname=<name>");
} else
msg_exit ("unsupported -oaccess=%s", access);
}
if (access_name)
free (access_name);
}
/* Attach 9nbd device to remote file.
*/
static void
_nbd_attach (Opt o, int argc, char **argv, int nopt, int vopt)
{
char *spec;
char *host;
char *addr;
char *dev;
char *path;
int fd;
char *options;
int blksize = 4096;
int uid;
if (argc != 2)
usage();
spec = argv[0];
dev = argv[1];
_parse_nbdspec (spec, &host, &path);
addr = _name2addr (host);
if (!opt_find (o, "aname")) {
opt_addf (o, "aname=%s", path);
path = NULL;
}
if (!opt_find (o, "msize"))
opt_addf (o, "msize=%d", DIOD_DEFAULT_MSIZE);
if (opt_find (o, "trans=fd"))
msg_exit ("9nbd doesn't work with trans=fd");
if (!opt_find (o, "trans"))
opt_addf (o, "trans=%s", "tcp");
if (opt_find (o, "version") && !opt_find (o, "version=9p2000.L"))
msg_exit ("9nbd only works with version=9p2000.L");
if (!opt_find (o, "version"))
opt_addf (o, "version=%s", "9p2000.L");
if (!opt_find (o, "port"))
opt_addf (o, "port=564");
/* for 9nbd we require uid=<int> instead of uname=<str> */
if (!opt_scanf (o, "uid=%d", &uid)) {
char uname[256];
if (opt_scanf (o, "uname=%255s", uname)) {
uid = _uname2uid (uname);
opt_delete (o, "uname");
} else
uid = 0;
opt_addf (o, "uid=%d", uid);
}
if (!opt_find (o, "auth"))
opt_addf (o, "auth=%s", "munge");
options = opt_csv (o);
if (!nopt) {
fd = open (dev, O_RDWR);
if (fd < 0 && (errno == ENOENT || errno == ENXIO)) {
system ("/sbin/modprobe 9nbd");
fd = open (dev, O_RDWR);
}
if (fd < 0)
err_exit ("open %s", dev);
}
if (vopt)
msg ("set blocksize=%d", blksize);
if (!nopt && ioctl (fd, NBD_SET_BLKSIZE, blksize) < 0)
err_exit ("ioctl set_blksize");
if (vopt)
msg ("set opts=%s", options);
if (!nopt && ioctl (fd, NBD_SET_OPTS, options) < 0)
err_exit ("ioctl set_opts");
if (vopt)
msg ("set addr=%s", addr);
if (!nopt && ioctl (fd, NBD_SET_ADDR, addr) < 0)
err_exit ("ioctl set_addr");
if (vopt)
msg ("set path=%s", path ? path : "null");
if (!nopt && ioctl (fd, NBD_SET_PATH, path) < 0)
err_exit ("ioctl set_path");
if (vopt)
msg ("start");
if (!nopt && ioctl (fd, NBD_START) < 0)
err_exit ("ioctl start");
if (!nopt)
close (fd);
free (options);
free (host);
free (addr);
}
int
main (int argc, char *argv[])
{
char *dir = NULL;
char *spec, *host;
char *nspec = NULL;
int c, i;
int nopt = 0;
int vopt = 0;
int fopt = 0;
int aopt = 0;
int dopt = 0;
int rfd = -1, wfd = -1;
Opt o;
diod_log_init (argv[0]);
o = opt_create ();
opterr = 0;
while ((c = GETOPT (argc, argv, OPTIONS, longopts)) != -1) {
switch (c) {
case 'f': /* --fake-mount */
fopt = 1;
break;
case 'n': /* --no-mtab */
nopt = 1;
break;
case 'v': /* --verbose */
vopt++;
break;
case 'o': /* --options OPT[,OPT]... */
opt_addf (o, "%s", optarg);
break;
case 'a': /* --9nbd-attach */
aopt++;
break;
case 'd': /* --9nbd-detach */
dopt++;
break;
default:
usage ();
}
}
/* Take care of 9nbd operations and exit.
*/
if (aopt) {
_nbd_attach (o, argc - optind, argv + optind, nopt, vopt);
exit (0);
}
if (dopt) {
_nbd_detach (o, argc - optind, argv + optind, nopt, vopt);
exit (0);
}
if (optind != argc - 2)
usage ();
if (geteuid () != 0)
msg_exit ("you must be root");
spec = argv[optind++];
dir = argv[optind++];
host = _parse_spec (spec, o);
_verify_mountpoint (dir);
/* Remount - only pass mount flags into the VFS for an existing mount.
* Take care of it here and exit.
*/
if (opt_find (o, "remount")) {
if (opt_check_allowed_csv (o, "ro,rw,aname,remount"))
msg_exit ("-oremount can only be used with ro,rw");
_diod_remount (o, spec, dir, vopt, fopt);
goto done;
}
/* Ensure uname and access are set, and to diod-compatible values.
* The uname user becomes the euid which will be used by munge auth.
*/
_parse_uname_access (o);
if (seteuid (_uname2uid (opt_find (o, "uname"))) < 0)
err_exit ("seteuid");
/* We require -otrans=fd because auth occurs in user space, then live fd
* is passed to the kernel via -orfdno,wfdno.
*/
if (!opt_find (o, "trans"))
opt_addf (o, "trans=%s", "fd");
else if (!opt_find (o, "trans=fd"))
msg_exit ("only -otrans=fd transport is supported");
/* Set msize if not already set. Validate it later.
*/
if (!opt_find (o, "msize"))
opt_addf (o, "msize=%d", DIOD_DEFAULT_MSIZE);
/* Only .L version is supported.
*/
if (!opt_find (o, "version"))
opt_addf (o, "version=%s", "9p2000.L");
else if (!opt_find (o, "version=9p2000.L"))
msg_exit ("only -oversion=9p2000.L is supported (little p, big L)");
/* Set debug level.
*/
if (!opt_find (o, "debug"))
opt_addf (o, "debug=%d", 0x1); /* send errors to dmesg */
/* Set rwdepth (number of concurrent reads with buffer > msize).
* N.B. this option is not upstream yet but unknown options are ignored.
*/
if (!opt_find (o, "rwdepth"))
opt_addf (o, "rwdepth=%d", 1);
/* Server is on an inherited file descriptor.
* For testing, we start server on a socketpair duped to fd 0.
*/
if (opt_find (o, "rfdno") || opt_find (o, "wfdno")) {
if (!opt_scanf (o, "rfdno=%d", &rfd) || !opt_scanf (o, "wfdno=%d",&wfd))
msg_exit ("-orfdno,wfdno must be used together");
nopt = 1; /* force no mtab */
/* Connect to server on UNIX domain socket
*/
} else if (host[0] == '/') {
if (opt_find (o, "port"))
msg_exit ("-oport won't work with UNIX domain socket");
if ((rfd = diod_sock_connect_unix (host, 0)) < 0)
exit (1);
wfd = rfd;
opt_addf (o, "rfdno=%d", rfd);
opt_addf (o, "wfdno=%d", wfd);
/* Connect to server on IANA port (or user-specified) and host.
*/
} else {
char *port = opt_find (o, "port");
hostlist_iterator_t hi;
hostlist_t hl;
char *h;
if (!port)
port = "564";
if (!(hl = hostlist_create (host)))
msg_exit ("error parsing host string: %s", host);
if (!(hi = hostlist_iterator_create (hl)))
msg_exit ("out of memory");
while ((h = hostlist_next (hi))) {
if (vopt)
msg ("trying to connect to %s:%s", h, port);
if ((rfd = diod_sock_connect_inet (h, port, DIOD_SOCK_QUIET)) >= 0)
break;
}
if (h) { /* create new 'spec' string identifying successful host */
char *p = strchr (spec , ':');
int len = strlen (h) + (p ? strlen (p) : 0) + 1;
if (!(nspec = malloc (len)))
msg_exit ("out of memory");
snprintf (nspec, len, "%s%s", h, p ? p : "");
}
hostlist_destroy (hl);
if (rfd < 0)
msg_exit ("could not connect to server(s), giving up");
wfd = rfd;
opt_delete (o, "port");
opt_addf (o, "rfdno=%d", rfd);
opt_addf (o, "wfdno=%d", wfd);
}
NP_ASSERT (opt_find (o, "trans=fd"));
NP_ASSERT (opt_scanf (o, "msize=%d", &i));
NP_ASSERT (opt_find (o, "version=9p2000.L"));
NP_ASSERT (opt_scanf (o, "debug=%d", &i) || opt_scanf (o, "debug=%x", &i));
NP_ASSERT (opt_scanf (o, "wfdno=%d", &i) && opt_scanf (o, "rfdno=%d", &i));
NP_ASSERT ((opt_find (o, "access=user") && opt_find(o, "uname=root"))
|| (opt_scanf (o, "access=%d", &i) && opt_find(o, "uname")));
NP_ASSERT (!opt_find (o, "port"));
_diod_mount (o, rfd, wfd, nspec ? nspec : spec, dir, vopt, fopt, nopt);
done:
opt_destroy (o);
exit (0);
}
