/*
* Do magic checks on mountpoint/device/fsid, and then call unmount(2).
*/
int
checkname(char *mntname, char **typelist)
{
char buf[MAXPATHLEN];
struct statfs sfsbuf;
struct stat sb;
struct statfs *sfs;
char *delimp;
dev_t dev;
int len;
/*
* 1. Check if the name exists in the mounttable.
*/
sfs = checkmntlist(mntname);
/*
* 2. Remove trailing slashes if there are any. After that
* we look up the name in the mounttable again.
*/
if (sfs == NULL) {
len = strlen(mntname);
while (len > 1 && mntname[len - 1] == '/')
mntname[--len] = '\0';
sfs = checkmntlist(mntname);
}
/*
* 3. Check if the deprecated NFS syntax with an '@' has been used
* and translate it to the ':' syntax. Look up the name in the
* mount table again.
*/
if (sfs == NULL && (delimp = strrchr(mntname, '@')) != NULL) {
snprintf(buf, sizeof(buf), "%s:%.*s", delimp + 1,
(int)(delimp - mntname), mntname);
len = strlen(buf);
while (len > 1 && buf[len - 1] == '/')
buf[--len] = '\0';
sfs = checkmntlist(buf);
}
/*
* 4. Resort to a statfs(2) call. This is the last check so that
* hung NFS filesystems for example can be unmounted without
* potentially blocking forever in statfs() as long as the
* filesystem is specified unambiguously. This covers all the
* hard cases such as symlinks and mismatches between the
* mount list and reality.
* We also do this if an ambiguous mount point was specified.
*/
if (sfs == NULL || (getmntentry(NULL, mntname, NULL, FIND) != NULL &&
getmntentry(NULL, mntname, NULL, CHECKUNIQUE) == NULL)) {
if (statfs(mntname, &sfsbuf) != 0) {
warn("%s: statfs", mntname);
} else if (stat(mntname, &sb) != 0) {
warn("%s: stat", mntname);
} else if (S_ISDIR(sb.st_mode)) {
/* Check that `mntname' is the root directory. */
dev = sb.st_dev;
snprintf(buf, sizeof(buf), "%s/..", mntname);
if (stat(buf, &sb) != 0) {
warn("%s: stat", buf);
} else if (sb.st_dev == dev) {
warnx("%s: not a file system root directory",
mntname);
return (1);
} else
sfs = &sfsbuf;
}
}
if (sfs == NULL) {
warnx("%s: unknown file system", mntname);
return (1);
}
if (checkvfsname(sfs->f_fstypename, typelist))
return (1);
return (umountfs(sfs));
}
int
umountfs(char *name, char **typelist)
{
enum clnt_stat clnt_stat;
struct hostent *hp;
struct mtablist *mtab;
struct sockaddr_in saddr;
struct timeval pertry, try;
CLIENT *clp;
size_t len;
int so, speclen, do_rpc;
char *mntonname, *mntfromname;
char *mntfromnamerev;
char *nfsdirname, *orignfsdirname;
char *resolved, realname[MAXPATHLEN];
char *type, *delimp, *hostp, *origname;
len = 0;
mtab = NULL;
mntfromname = mntonname = delimp = hostp = orignfsdirname = NULL;
/*
* 1. Check if the name exists in the mounttable.
*/
(void)checkmntlist(name, &mntfromname, &mntonname, &type);
/*
* 2. Remove trailing slashes if there are any. After that
* we look up the name in the mounttable again.
*/
if (mntfromname == NULL && mntonname == NULL) {
speclen = strlen(name);
for (speclen = strlen(name);
speclen > 1 && name[speclen - 1] == '/';
speclen--)
name[speclen - 1] = '\0';
(void)checkmntlist(name, &mntfromname, &mntonname, &type);
resolved = name;
/* Save off original name in origname */
if ((origname = strdup(name)) == NULL)
err(1, "strdup");
/*
* 3. Check if the deprecated nfs-syntax with an '@'
* has been used and translate it to the ':' syntax.
* Look up the name in the mounttable again.
*/
if (mntfromname == NULL && mntonname == NULL) {
if ((delimp = strrchr(name, '@')) != NULL) {
hostp = delimp + 1;
if (*hostp != '\0') {
/*
* Make both '@' and ':'
* notations equal
*/
char *host = strdup(hostp);
len = strlen(hostp);
if (host == NULL)
err(1, "strdup");
memmove(name + len + 1, name,
(size_t)(delimp - name));
name[len] = ':';
memmove(name, host, len);
free(host);
}
for (speclen = strlen(name);
speclen > 1 && name[speclen - 1] == '/';
speclen--)
name[speclen - 1] = '\0';
name[len + speclen + 1] = '\0';
(void)checkmntlist(name, &mntfromname,
&mntonname, &type);
resolved = name;
}
/*
* 4. Check if a relative mountpoint has been
* specified. This should happen as last check,
* the order is important. To prevent possible
* nfs-hangs, we just call realpath(3) on the
* basedir of mountpoint and add the dirname again.
* Check the name in mounttable one last time.
*/
if (mntfromname == NULL && mntonname == NULL) {
(void)strcpy(name, origname);
if ((getrealname(name, realname)) != NULL) {
(void)checkmntlist(realname,
&mntfromname, &mntonname, &type);
resolved = realname;
}
/*
* All tests failed, return to main()
*/
if (mntfromname == NULL && mntonname == NULL) {
(void)strcpy(name, origname);
warnx("%s: not currently mounted",
origname);
free(origname);
return (1);
}
}
}
free(origname);
} else
resolved = name;
if (checkvfsname(type, typelist))
return (1);
hp = NULL;
nfsdirname = NULL;
if (!strcmp(type, "nfs")) {
if ((nfsdirname = strdup(mntfromname)) == NULL)
err(1, "strdup");
orignfsdirname = nfsdirname;
if ((delimp = strchr(nfsdirname, ':')) != NULL) {
*delimp = '\0';
hostp = nfsdirname;
if ((hp = gethostbyname(hostp)) == NULL) {
warnx("can't get net id for host");
}
nfsdirname = delimp + 1;
}
}
/*
* Check if the reverse entrys of the mounttable are really the
* same as the normal ones.
*/
if ((mntfromnamerev = strdup(getmntname(getmntname(mntfromname,
NULL, MNTON, &type, NAME), NULL, MNTFROM, &type, NAME))) == NULL)
err(1, "strdup");
/*
* Mark the uppermost mount as unmounted.
*/
(void)getmntname(mntfromname, mntonname, NOTHING, &type, MARK);
/*
* If several equal mounts are in the mounttable, check the order
* and warn the user if necessary.
*/
if (strcmp(mntfromnamerev, mntfromname ) != 0 &&
strcmp(resolved, mntonname) != 0) {
warnx("cannot umount %s, %s\n "
"is mounted there, umount it first",
mntonname, mntfromnamerev);
/* call getmntname again to set mntcheck[i] to 0 */
(void)getmntname(mntfromname, mntonname,
NOTHING, &type, UNMARK);
return (1);
}
free(mntfromnamerev);
/*
* Check if we have to start the rpc-call later.
* If there are still identical nfs-names mounted,
* we skip the rpc-call. Obviously this has to
* happen before unmount(2), but it should happen
* after the previous namecheck.
*/
if (strcmp(type, "nfs") == 0 && getmntname(mntfromname, NULL, NOTHING,
&type, COUNT) != NULL)
do_rpc = 1;
else
do_rpc = 0;
if (!namematch(hp))
return (1);
if (unmount(mntonname, fflag) != 0 ) {
warn("unmount of %s failed", mntonname);
return (1);
}
if (vflag)
(void)printf("%s: unmount from %s\n", mntfromname, mntonname);
/*
* Report to mountd-server which nfsname
* has been unmounted.
*/
if (hp != NULL && !(fflag & MNT_FORCE) && do_rpc) {
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = 0;
memmove(&saddr.sin_addr, hp->h_addr,
MIN(hp->h_length, sizeof(saddr.sin_addr)));
pertry.tv_sec = 3;
pertry.tv_usec = 0;
so = RPC_ANYSOCK;
if ((clp = clntudp_create(&saddr,
RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
clnt_pcreateerror("Cannot MNT PRC");
return (1);
}
clp->cl_auth = authunix_create_default();
try.tv_sec = 20;
try.tv_usec = 0;
clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir,
nfsdirname, xdr_void, (caddr_t)0, try);
if (clnt_stat != RPC_SUCCESS) {
clnt_perror(clp, "Bad MNT RPC");
return (1);
}
/*
* Remove the unmounted entry from /var/db/mounttab.
*/
if (read_mtab(mtab)) {
mtab = mtabhead;
clean_mtab(hostp, nfsdirname);
if(!write_mtab())
warnx("cannot remove entry %s:%s",
hostp, nfsdirname);
free_mtab();
}
free(orignfsdirname);
auth_destroy(clp->cl_auth);
clnt_destroy(clp);
}
