[unix-history] / usr / src / sbin / umount / umount.c

/*-
* Copyright (c) 1980, 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1989, 1993\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)umount.c    8.5 (Berkeley) %G%";
#endif /* not lint */

#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 <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>

typedef enum { MNTON, MNTFROM } mntwhat;

int     fake, fflag, vflag, *typelist;
char    *nfshost;

int      fsnametotype __P((char *));
char    *getmntname __P((char *, mntwhat, int *));
void     maketypelist __P((char *));
int      selected __P((int));
int      namematch __P((struct hostent *));
int      umountall __P((void));
int      umountfs __P((char *));
void     usage __P((void));
int      xdr_dir __P((XDR *, char *));

int
main(argc, argv)
       int argc;
       char *argv[];
{
       int all, ch, errs;

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

       all = 0;
       while ((ch = getopt(argc, argv, "aFfh:t:v")) != EOF)
               switch (ch) {
               case 'a':
                       all = 1;
                       break;
               case 'F':
                       fake = 1;
                       break;
               case 'f':
                       fflag = MNT_FORCE;
                       break;
               case 'h':       /* -h implies -a. */
                       all = 1;
                       nfshost = optarg;
                       break;
               case 't':
                       maketypelist(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))
               maketypelist("nfs");
               
       if (all) {
               if (setfsent() == 0)
                       err(1, "%s", _PATH_FSTAB);
               errs = umountall();
       } else
               for (errs = 0; *argv != NULL; ++argv)
                       if (umountfs(*argv) != 0)
                               errs = 1;
       exit(errs);
}

int
umountall()
{
       struct fstab *fs;
       int rval, type;
       char *cp;

       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 ((type = fsnametotype(fs->fs_vfstype)) == MOUNT_NONE) {
                       warnx("%s: unknown mount type", fs->fs_vfstype);
                       continue;
               }
               if (!selected(type))
                       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();
               return (umountfs(cp) || rval);
       }
       return (0);
}

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

       if (realpath(name, rname) == NULL) {
               warn("%s", rname);
               return (1);
       }

       name = rname;

       if (stat(name, &sb) < 0) {
               if (((mntpt = getmntname(name, MNTFROM, &type)) == NULL) &&
                   ((mntpt = getmntname(name, MNTON, &type)) == NULL)) {
                       warnx("%s: not currently mounted", name);
                       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);
       }

       if (!selected(type))
               return (1);

       if ((delimp = strchr(name, '@')) != NULL) {
               hostp = delimp + 1;
               *delimp = '\0';
               hp = gethostbyname(hostp);
               *delimp = '@';
       } else if ((delimp = strchr(name, ':')) != NULL) {
               *delimp = '\0';
               hostp = name;
               hp = gethostbyname(hostp);
               name = delimp + 1;
               *delimp = ':';
       } else
               hp = NULL;
       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) {
               warn("%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;
               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, name, xdr_void, (caddr_t)0, try);
               if (clnt_stat != RPC_SUCCESS) {
                       clnt_perror(clp, "Bad MNT RPC");
                       return (1);
               }
               auth_destroy(clp->cl_auth);
               clnt_destroy(clp);
       }
       return (0);
}

char *
getmntname(name, what, type)
       char *name;
       mntwhat what;
       int *type;
{
       struct statfs *mntbuf;
       int i, mntsize;

       if ((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_type;
                       return (mntbuf[i].f_mntonname);
               }
               if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) {
                       if (type)
                               *type = mntbuf[i].f_type;
                       return (mntbuf[i].f_mntfromname);
               }
       }
       return (NULL);
}

static enum { IN_LIST, NOT_IN_LIST } which;

int
selected(type)
       int type;
{
       int *av;

       /* If no type specified, it's always selected. */
       if (typelist == NULL)
               return (1);
       for (av = typelist; *av != NULL; ++av)
               if (type == *typelist)
                       return (which == IN_LIST ? 1 : 0);
       return (which == IN_LIST ? 0 : 1);
}

void
maketypelist(fslist)
       char *fslist;
{
       int *av, i;
       char *nextcp;

       if ((fslist == NULL) || (fslist[0] == '\0'))
               errx(1, "empty type list");

       /*
        * XXX
        * Note: the syntax is "noxxx,yyy" for no xxx's and
        * no yyy's, not the more intuitive "noyyy,noyyy".
        */
       if (fslist[0] == 'n' && fslist[1] == 'o') {
               fslist += 2;
               which = NOT_IN_LIST;
       } else
               which = IN_LIST;

       /* Count the number of types. */
       for (i = 0, nextcp = fslist; *nextcp != NULL; ++nextcp)
               if (*nextcp == ',')
                       i++;

       /* Build an array of that many types. */
       if ((av = typelist = malloc((i + 2) * sizeof(int))) == NULL)
               err(1, NULL);
       for (i = 0; fslist != NULL; fslist = nextcp, ++i) {
               if ((nextcp = strchr(fslist, ',')) != NULL)
                       *nextcp++ = '\0';
               av[i] = fsnametotype(fslist);
               if (av[i] == MOUNT_NONE)
                       errx(1, "%s: unknown mount type", fslist);
       }
       /* Terminate the array. */
       av[i++] = MOUNT_NONE;
}

int
fsnametotype(name)
       char *name;
{
       static char const *namelist[] = INITMOUNTNAMES;
       char const **cp;

       for (cp = namelist; *cp; ++cp)
               if (strcmp(name, *cp) == 0)
                       return (cp - namelist);
       return (MOUNT_NONE);
}

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

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

       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);
}

/*
* xdr routines for mount rpc's
*/
int
xdr_dir(xdrsp, dirp)
       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);
}