NetBSD/sbin/umount/umount.c

463 lines
11 KiB
C

/* $NetBSD: umount.c,v 1.53 2020/04/23 04:21:13 christos Exp $ */
/*-
* Copyright (c) 1980, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95";
#else
__RCSID("$NetBSD: umount.c,v 1.53 2020/04/23 04:21:13 christos Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/time.h>
#ifndef SMALL
#include <sys/socket.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsmount.h>
#endif /* !SMALL */
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
typedef enum { MNTANY, MNTON, MNTFROM } mntwhat;
#ifndef SMALL
#include "mountprog.h"
static int fake, verbose;
static char *nfshost;
static struct addrinfo *nfshost_ai = NULL;
static int namematch(const struct addrinfo *);
static int sacmp(const struct sockaddr *, const struct sockaddr *);
static int xdr_dir(XDR *, char *);
static const char *getmntproto(const char *);
#endif /* !SMALL */
static int fflag;
static char *getmntname(const char *, mntwhat, char **);
static int umountfs(const char *, const char **, int);
static void usage(void) __dead;
int
main(int argc, char *argv[])
{
int ch, errs, all = 0, raw = 0;
char mntfromname[MAXPATHLEN];
#ifndef SMALL
int mnts;
struct statvfs *mntbuf;
struct addrinfo hints;
#endif /* SMALL */
const char **typelist = NULL;
#ifdef SMALL
#define OPTS "fR"
#else
#define OPTS "AaFfh:Rt:v"
#endif
while ((ch = getopt(argc, argv, OPTS)) != -1)
switch (ch) {
case 'f':
fflag = MNT_FORCE;
break;
case 'R':
raw = 1;
break;
#ifndef SMALL
case 'A':
case 'a':
all = 1;
break;
case 'F':
fake = 1;
break;
case 'h': /* -h implies -A. */
all = 1;
nfshost = optarg;
break;
case 't':
if (typelist != NULL)
errx(1, "only one -t option may be specified.");
typelist = makevfslist(optarg);
break;
case 'v':
verbose = 1;
break;
#endif /* !SMALL */
default:
usage();
/* NOTREACHED */
}
argc -= optind;
argv += optind;
if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw))
usage();
#ifndef SMALL
/* -h implies "-t nfs" if no -t flag. */
if ((nfshost != NULL) && (typelist == NULL))
typelist = makevfslist("nfs");
if (nfshost != NULL) {
memset(&hints, 0, sizeof hints);
if (getaddrinfo(nfshost, NULL, &hints, &nfshost_ai) != 0) {
nfshost_ai = NULL;
}
}
errs = 0;
if (all) {
if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) {
warn("getmntinfo");
errs = 1;
}
for (errs = 0, mnts--; mnts > 0; mnts--) {
if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
continue;
if (umountfs(mntbuf[mnts].f_mntonname, typelist,
1) != 0)
errs = 1;
}
} else
#endif /* !SMALL */
for (errs = 0; *argv != NULL; ++argv) {
if (getfsspecname(mntfromname, sizeof(mntfromname),
*argv) == NULL)
err(EXIT_FAILURE, "%s", mntfromname);
if (umountfs(mntfromname, typelist, raw) != 0)
errs = 1;
}
return errs;
}
static int
umountfs(const char *name, const char **typelist, int raw)
{
#ifndef SMALL
enum clnt_stat clnt_stat;
struct timeval try;
CLIENT *clp;
char *hostp = NULL;
struct addrinfo *ai = NULL, hints;
const char *proto = NULL;
#endif /* !SMALL */
const char *mntpt;
char *type, rname[MAXPATHLEN], umountprog[MAXPATHLEN];
mntwhat what;
struct stat sb;
if (raw) {
mntpt = name;
} else {
what = MNTANY;
if (realpath(name, rname) != NULL) {
name = rname;
if (stat(name, &sb) == 0) {
if (S_ISBLK(sb.st_mode))
what = MNTON;
else if (S_ISDIR(sb.st_mode))
what = MNTFROM;
}
}
#ifdef SMALL
else {
warn("%s", name);
return 1;
}
#endif /* SMALL */
mntpt = name;
switch (what) {
case MNTON:
if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
warnx("%s: not currently mounted", name);
return (1);
}
break;
case MNTFROM:
if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
warnx("%s: not currently mounted", mntpt);
return (1);
}
break;
default:
if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
name = mntpt;
if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
warnx("%s: not currently mounted", name);
return 1;
}
}
}
#ifndef SMALL
if (checkvfsname(type, typelist))
return 1;
(void)memset(&hints, 0, sizeof hints);
if (!strncmp(type, MOUNT_NFS,
sizeof(((struct statvfs *)NULL)->f_fstypename))) {
char *delimp;
proto = getmntproto(mntpt);
/* look for host:mountpoint */
if ((delimp = strrchr(name, ':')) != NULL) {
int len = delimp - name;
hostp = malloc(len + 1);
if (hostp == NULL)
return 1;
memcpy(hostp, name, len);
hostp[len] = 0;
name += len + 1;
if (getaddrinfo(hostp, NULL, &hints, &ai) != 0)
ai = NULL;
}
}
if (!namematch(ai))
return 1;
#endif /* ! SMALL */
snprintf(umountprog, sizeof(umountprog), "umount_%s", type);
}
#ifndef SMALL
if (verbose) {
(void)printf("%s: unmount from %s\n", name, mntpt);
/* put this before the test of FAKE */
if (!raw) {
(void)printf("Trying unmount program %s\n",
umountprog);
}
}
if (fake)
return 0;
#endif /* ! SMALL */
if (!raw) {
/*
* The only options that need to be passed on are -f
* and -v.
*/
char *args[3];
unsigned nargs = 0;
args[nargs++] = umountprog;
if (fflag == MNT_FORCE) {
args[nargs++] = __UNCONST("-f");
}
#ifndef SMALL
if (verbose) {
args[nargs++] = __UNCONST("-v");
}
#endif
execvp(umountprog, args);
if (errno != ENOENT) {
warn("%s: execvp", umountprog);
}
}
#ifndef SMALL
if (verbose)
(void)printf("(No separate unmount program.)\n");
#endif
if (unmount(mntpt, fflag) == -1) {
warn("%s", mntpt);
return 1;
}
#ifndef SMALL
if (ai != NULL && !(fflag & MNT_FORCE)) {
clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, proto);
if (clp == NULL) {
clnt_pcreateerror("Cannot MNT PRC");
return 1;
}
clp->cl_auth = authsys_create_default();
try.tv_sec = 20;
try.tv_usec = 0;
clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir,
__UNCONST(name), xdr_void, NULL, try);
if (clnt_stat != RPC_SUCCESS) {
clnt_perror(clp, "Bad MNT RPC");
return 1;
}
auth_destroy(clp->cl_auth);
clnt_destroy(clp);
}
#endif /* ! SMALL */
return 0;
}
static char *
getmntname(const char *name, mntwhat what, char **type)
{
static struct statvfs *mntbuf;
static int mntsize;
static char mntfromname[MAXPATHLEN];
int i;
if (mntbuf == NULL &&
(mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
warn("getmntinfo");
return (NULL);
}
for (i = mntsize - 1; i >= 0; i--) {
if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) {
if (type)
*type = mntbuf[i].f_fstypename;
return (mntbuf[i].f_mntonname);
}
if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
if (type)
*type = mntbuf[i].f_fstypename;
if (getfsspecname(mntfromname, sizeof(mntfromname),
mntbuf[i].f_mntfromname) == NULL)
err(EXIT_FAILURE, "%s", mntfromname);
return mntfromname;
}
}
return (NULL);
}
#ifndef SMALL
static int
sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const void *p1, *p2;
size_t len;
if (sa1->sa_family != sa2->sa_family)
return 1;
switch (sa1->sa_family) {
case AF_INET:
p1 = &((const struct sockaddr_in *)sa1)->sin_addr;
p2 = &((const struct sockaddr_in *)sa2)->sin_addr;
len = 4;
break;
case AF_INET6:
p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr;
p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr;
len = 16;
if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id !=
((const struct sockaddr_in6 *)sa2)->sin6_scope_id)
return 1;
break;
default:
return 1;
}
return memcmp(p1, p2, len);
}
static int
namematch(const struct addrinfo *ai)
{
struct addrinfo *aip;
if (nfshost == NULL || nfshost_ai == NULL)
return (1);
while (ai != NULL) {
aip = nfshost_ai;
while (aip != NULL) {
if (sacmp(ai->ai_addr, aip->ai_addr) == 0)
return 1;
aip = aip->ai_next;
}
ai = ai->ai_next;
}
return 0;
}
/*
* xdr routines for mount rpc's
*/
static int
xdr_dir(XDR *xdrsp, char *dirp)
{
return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN);
}
static const char *
getmntproto(const char *name)
{
struct nfs_args nfsargs;
struct sockaddr_storage ss;
nfsargs.sotype = SOCK_DGRAM;
nfsargs.addr = (struct sockaddr *)&ss;
nfsargs.addrlen = sizeof(ss);
(void)mount("nfs", name, MNT_GETARGS, &nfsargs, sizeof(nfsargs));
return nfsargs.sotype == SOCK_STREAM ? "tcp" : "udp";
}
#endif /* !SMALL */
static void
usage(void)
{
#ifdef SMALL
(void)fprintf(stderr,
"Usage: %s [-fR] special | node\n", getprogname());
#else
(void)fprintf(stderr,
"Usage: %s [-fvFR] [-t fstypelist] special | node\n"
"\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(),
getprogname());
#endif /* SMALL */
exit(1);
}