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umount.c

/*
 * Copyright (c) 1999-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>

#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <nfs/rpcv2.h>

#include <err.h>
#include <fstab.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

typedef enum { MNTON, MNTFROM } mntwhat;

int   fake, fflag, vflag;
char  *nfshost;

uid_t real_uid, eff_uid;

int    checkvfsname(const char *, char **);
char  *getmntname(const char *, mntwhat, char **);
int    getmntfsid(const char *, fsid_t *);
int    sysctl_fsid(int, fsid_t *, void *, size_t *, void *, size_t);
int    unmount_by_fsid(const char *mntpt, int flag);
char  **makevfslist(char *);
int    selected(int);
int    namematch(struct hostent *);
int    umountall(char **);
int    umountfs(char *, char **);
void   usage(void);
int    xdr_dir(XDR *, char *);

int
main(int argc, char *argv[])
{
      int all, ch, errs, mnts;
      char **typelist = NULL;
      struct statfs *mntbuf;

      /* drop setuid root privs asap */
      eff_uid = geteuid();
      real_uid = getuid();
      seteuid(real_uid); 

      /* Start disks transferring immediately. */
      sync();

      all = 0;
      while ((ch = getopt(argc, argv, "AaFfh:t:v")) != EOF)
            switch (ch) {
            case 'A':
                  all = 2;
                  break;
            case 'a':
                  all = 1;
                  break;
            case 'F':
                  fake = 1;
                  break;
            case 'f':
                  fflag = MNT_FORCE;
                  break;
            case 'h':   /* -h implies -A. */
                  all = 2;
                  nfshost = optarg;
                  break;
            case 't':
                  if (typelist != NULL)
                        errx(1, "only one -t option may be specified.");
                  typelist = makevfslist(optarg);
                  break;
            case 'v':
                  vflag = 1;
                  break;
            default:
                  usage();
                  /* NOTREACHED */
            }
      argc -= optind;
      argv += optind;

      if (argc == 0 && !all || argc != 0 && all)
            usage();

      /* -h implies "-t nfs" if no -t flag. */
      if ((nfshost != NULL) && (typelist == NULL))
            typelist = makevfslist("nfs");

      if (fflag & MNT_FORCE) {
            /*
             * If we really mean business, we don't want to get hung up on
             * any remote file systems.  So, we set the "noremotehang" flag.
             */
            pid_t pid;
            pid = getpid();
            seteuid(eff_uid);
            errs = sysctlbyname("vfs.generic.noremotehang", NULL, NULL, &pid, sizeof(pid));
            seteuid(real_uid);
            if ((errs != 0) && vflag)
                    warn("sysctl vfs.generic.noremotehang");
      }

      errs = EXIT_SUCCESS;
      switch (all) {
      case 2:
            if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
                  warn("getmntinfo");
                  errs = 1;
                  break;
            }
            for (errs = 0, mnts--; mnts > 0; mnts--) {
                  if (checkvfsname(mntbuf[mnts].f_fstypename, typelist))
                        continue;
                  if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0)
                        errs = 1;
            }
            break;
      case 1:
            if (setfsent() == 0)
                  err(1, "%s", _PATH_FSTAB);
            errs = umountall(typelist);
            break;
      case 0:
            for (errs = 0; *argv != NULL; ++argv)
                  if (umountfs(*argv, typelist) != 0)
                        errs = 1;
            break;
      }
      exit(errs);
}

int
umountall(char **typelist)
{
      struct fstab *fs;
      int rval;
      char *cp;
      struct vfsconf vfc;

      while ((fs = getfsent()) != NULL) {
            /* Ignore the root. */
            if (strcmp(fs->fs_file, "/") == 0)
                  continue;
            /*
             * !!!
             * Historic practice: ignore unknown FSTAB_* fields.
             */
            if (strcmp(fs->fs_type, FSTAB_RW) &&
                strcmp(fs->fs_type, FSTAB_RO) &&
                strcmp(fs->fs_type, FSTAB_RQ))
                  continue;
            /* If an unknown file system type, complain. */
            if (getvfsbyname(fs->fs_vfstype, &vfc) < 0) {
                  warnx("%s: unknown mount type", fs->fs_vfstype);
                  continue;
            }
            if (checkvfsname(fs->fs_vfstype, typelist))
                  continue;

            /* 
             * We want to unmount the file systems in the reverse order
             * that they were mounted.  So, we save off the file name
             * in some allocated memory, and then call recursively.
             */
            if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL)
                  err(1, NULL);
            (void)strcpy(cp, fs->fs_file);
            rval = umountall(typelist);
            return (umountfs(cp, typelist) || rval);
      }
      return (0);
}

int
umountfs(char *name, char **typelist)
{
      enum clnt_stat clnt_stat;
      struct hostent *hp;
      struct sockaddr_in saddr;
      struct stat sb;
      struct timeval pertry, try;
      CLIENT *clp;
      int so, isftpfs;
      char *type, *delimp, *hostp, *mntpt, rname[MAXPATHLEN], *expname, *tname;

      if (fflag & MNT_FORCE) {
            /*
             * For force unmounts, we first directly check the
             * current mount list for a match.  If we find it,
             * we skip the realpath()/stat() below to avoid
             * depending on the "noremotehang" flag to save us
             * if we get hung up on an unresponsive file system.
             */
            tname = name;
            /* check if name is a non-device "mount from" name */
            if ((mntpt = getmntname(tname, MNTON, &type)) == NULL) {
                  /* or if name is a mounted-on directory */
                  mntpt = tname;
                  tname = getmntname(mntpt, MNTFROM, &type);
            }
            if (mntpt && tname) {
                  /* we found a match */
                  name = tname;
                  goto got_mount_point;
            }
      }

      /*
       * Note: in the face of path resolution errors (realpath/stat),
       * we just try using the name passed in as is.
       */

      if (realpath(name, rname) == NULL) {
            if (vflag)
                  warn("realpath(%s)", rname);
      } else {
            name = rname;
      }

      if (stat(name, &sb) < 0) {
            if (vflag)
                  warn("stat(%s)", name);
            /* maybe name is a non-device "mount from" name? */
            if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
                  /* or name is a directory we simply can't reach? */
                  mntpt = name;
                  if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
                        warnx("%s: not currently mounted", mntpt);
                        return (1);
                  }
            }
      } else if (S_ISBLK(sb.st_mode)) {
            if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
                  warnx("%s: not currently mounted", name);
                  return (1);
            }
      } else if (S_ISDIR(sb.st_mode)) {
            mntpt = name;
            if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
                  warnx("%s: not currently mounted", mntpt);
                  return (1);
            }
      } else {
            warnx("%s: not a directory or special device", name);
            return (1);
      }

got_mount_point:

      if (checkvfsname(type, typelist))
            return (1);

      if (!strncmp("ftp://", name, 6))
            isftpfs = 1;
      else
            isftpfs = 0;

      hp = NULL;
      delimp = NULL;
      expname = NULL;
      if (!strcmp(type, "nfs") && !isftpfs) {
            if ((delimp = strchr(name, '@')) != NULL) {
                  hostp = delimp + 1;
                  *delimp = '\0';
                  hp = gethostbyname(hostp);
                  *delimp = '@';
                  expname = name;
            } else if ((delimp = strchr(name, ':')) != NULL) {
                  *delimp = '\0';
                  hostp = name;
                  hp = gethostbyname(hostp);
                  expname = delimp + 1;
                  *delimp = ':';
            }
      }

      if (!namematch(hp))
            return (1);

      if (vflag)
            (void)printf("%s unmount from %s\n", name, mntpt);
      if (fake)
            return (0);

      if (unmount(mntpt, fflag) < 0) {
            /*
             * If we're root and it looks like the error is that the
             * mounted on directory is just not reachable or if we really
             * want this filesystem unmounted (MNT_FORCE), then try doing
             * the unmount by fsid.  (Note: the sysctl only works for root)
             */
            if ((real_uid == 0) &&
                ((errno == ESTALE) || (errno == ENOENT) || (fflag & MNT_FORCE))) {
                  if (vflag)
                        warn("unmount(%s)", mntpt);
                  if (unmount_by_fsid(mntpt, fflag) < 0) {
                        warn("unmount(%s)", mntpt);
                        return (1);
                  }
            } else {
                  warn("unmount(%s)", mntpt);
                  return (1);
            }
      }

      if ((hp != NULL) && !(fflag & MNT_FORCE)) {
            *delimp = '\0';
            memset(&saddr, 0, sizeof(saddr));
            saddr.sin_family = AF_INET;
            saddr.sin_port = 0;
            memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
            pertry.tv_sec = 3;
            pertry.tv_usec = 0;
            so = RPC_ANYSOCK;
            /*
             * temporarily revert to root, to avoid reserved port
             * number restriction (port# less than 1024)
             */
            seteuid(eff_uid);
            if ((clp = clntudp_create(&saddr,
                RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) {
                  clnt_pcreateerror("Cannot MNT PRC");
                  seteuid(real_uid);
                  /* unmount succeeded above, so don't actually return error */
                  return (0);
            }
            clp->cl_auth = authunix_create_default();
            seteuid(real_uid);
            try.tv_sec = 20;
            try.tv_usec = 0;
            clnt_stat = clnt_call(clp,
                RPCMNT_UMOUNT, xdr_dir, expname, xdr_void, (caddr_t)0, try);
            if (clnt_stat != RPC_SUCCESS) {
                  clnt_perror(clp, "Bad MNT RPC");
                  /* unmount succeeded above, so don't actually return error */
                  return (0);
            }
            auth_destroy(clp->cl_auth);
            clnt_destroy(clp);
      }
      return (0);
}

static struct statfs *mntbuf;
static int mntsize;

char *
getmntname(const char *name, mntwhat what, char **type)
{
      int i;

      if (mntbuf == NULL &&
          (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
            warn("getmntinfo");
            return (NULL);
      }
      for (i = 0; i < mntsize; 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;
                  return (mntbuf[i].f_mntfromname);
            }
      }
      return (NULL);
}

int
getmntfsid(const char *name, fsid_t *fsid)
{
      int i;

      if (mntbuf == NULL &&
          (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
            warn("getmntinfo");
            return (-1);
      }
      for (i = 0; i < mntsize; i++) {
            if (!strcmp(mntbuf[i].f_mntonname, name)) {
                  *fsid = mntbuf[i].f_fsid;
                  return (0);
            }
      }
      return (-1);
}

int
namematch(struct hostent *hp)
{
      char *cp, **np;

      if (nfshost == NULL)
            return (1);

      if (hp == NULL)
            return (0);

      if (strcasecmp(nfshost, hp->h_name) == 0)
            return (1);

      if ((cp = strchr(hp->h_name, '.')) != NULL) {
            *cp = '\0';
            if (strcasecmp(nfshost, hp->h_name) == 0)
                  return (1);
      }
      for (np = hp->h_aliases; *np; np++) {
            if (strcasecmp(nfshost, *np) == 0)
                  return (1);
            if ((cp = strchr(*np, '.')) != NULL) {
                  *cp = '\0';
                  if (strcasecmp(nfshost, *np) == 0)
                        return (1);
            }
      }
      return (0);
}


int
sysctl_fsid(
      int op,
      fsid_t *fsid,
      void *oldp,
      size_t *oldlenp,
      void *newp,
      size_t newlen)
{
      int ctlname[CTL_MAXNAME+2];
      size_t ctllen;
      const char *sysstr = "vfs.generic.ctlbyfsid";
      struct vfsidctl vc;

      ctllen = CTL_MAXNAME+2;
      if (sysctlnametomib(sysstr, ctlname, &ctllen) == -1) {
            warn("sysctlnametomib(%s)", sysstr);
            return (-1);
      };
      ctlname[ctllen] = op;

      bzero(&vc, sizeof(vc));
      vc.vc_vers = VFS_CTL_VERS1;
      vc.vc_fsid = *fsid;
      vc.vc_ptr = newp;
      vc.vc_len = newlen;
      return (sysctl(ctlname, ctllen + 1, oldp, oldlenp, &vc, sizeof(vc)));
}


int
unmount_by_fsid(const char *mntpt, int flag)
{
      fsid_t fsid;
      if (getmntfsid(mntpt, &fsid) < 0)
            return (-1);
      if (vflag)
            printf("attempting to unmount %s by fsid\n", mntpt);
      return sysctl_fsid(VFS_CTL_UMOUNT, &fsid, NULL, 0, &flag, sizeof(flag));
}

/*
 * xdr routines for mount rpc's
 */
int
xdr_dir(XDR *xdrsp, char *dirp)
{
      return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
}

void
usage()
{
      (void)fprintf(stderr,
          "usage: %s\n       %s\n",
          "umount [-fv] [-t fstypelist] special | node",
          "umount -a[fv] [-h host] [-t fstypelist]");
      exit(1);
}

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