usr/src/cmd/fs.d/lofs/mount/mount.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #define LOFS
  28 #define MNTTYPE_LOFS "lofs"
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <libintl.h>
  33 #include <errno.h>
  34 #include <sys/fstyp.h>
  35 #include <sys/fsid.h>
  36 #include <sys/mntent.h>
  37 #include <sys/mnttab.h>
  38 #include <sys/mount.h>
  39 #include <sys/signal.h>
  40 #include <sys/stat.h>
  41 #include <fslib.h>
  42
  43 #define RET_OK          0
  44 /*
  45  * /sbin/mount and the fs-local method understand this exit code to
  46  * mean that all the mount failures were related to lofs mounts. Since
  47  * this program only attempts to mount lofs file systems, when it fails
  48  * it returns this exit status.
  49  */
  50 #define RET_ERR         111
  51
  52 static void usage(void);
  53
  54 static char  optbuf[MAX_MNTOPT_STR] = { '\0', };
  55 static int   optsize = 0;
  56
  57 static char fstype[] = MNTTYPE_LOFS;
  58
  59 /*
  60  * usage: mount [-Ormq] [-o options] special mountp
  61  *
  62  * This mount program is exec'ed by /usr/sbin/mount if '-F lofs' is
  63  * specified.
  64  */
  65 int
  66 main(int argc, char *argv[])
  67 {
  68         int c;
  69         char *special;          /* Entity being mounted */
  70         char *mountp;           /* Entity being mounted on */
  71         char *savedoptbuf;
  72         char *myname;
  73         char typename[64];
  74         int flags = 0;
  75         int errflag = 0;
  76         int qflg = 0;
  77
  78         myname = strrchr(argv[0], '/');
  79         myname = myname ? myname+1 : argv[0];
  80         (void) snprintf(typename, sizeof (typename), "%s %s", fstype, myname);
  81         argv[0] = typename;
  82
  83         while ((c = getopt(argc, argv, "o:rmOq")) != EOF) {
  84                 switch (c) {
  85                 case '?':
  86                         errflag++;
  87                         break;
  88
  89                 case 'o':
  90                         if (strlcpy(optbuf, optarg, sizeof (optbuf)) >=
  91                             sizeof (optbuf)) {
  92                                 (void) fprintf(stderr,
  93                                     gettext("%s: Invalid argument: %s\n"),
  94                                     myname, optarg);
  95                                 return (2);
  96                         }
  97                         optsize = strlen(optbuf);
  98                         break;
  99                 case 'O':
 100                         flags |= MS_OVERLAY;
 101                         break;
 102                 case 'r':
 103                         flags |= MS_RDONLY;
 104                         break;
 105
 106                 case 'm':
 107                         flags |= MS_NOMNTTAB;
 108                         break;
 109
 110                 case 'q':
 111                         qflg = 1;
 112                         break;
 113
 114                 default:
 115                         usage();
 116                 }
 117         }
 118         if ((argc - optind != 2) || errflag) {
 119                 usage();
 120         }
 121         special = argv[argc - 2];
 122         mountp = argv[argc - 1];
 123
 124         if ((savedoptbuf = strdup(optbuf)) == NULL) {
 125                 (void) fprintf(stderr, gettext("%s: out of memory\n"),
 126                     myname);
 127                 exit(2);
 128         }
 129         if (mount(special, mountp, flags | MS_OPTIONSTR, fstype, NULL, 0,
 130             optbuf, MAX_MNTOPT_STR)) {
 131                 (void) fprintf(stderr, "mount: ");
 132                 perror(special);
 133                 exit(RET_ERR);
 134         }
 135         if (optsize && !qflg)
 136                 cmp_requested_to_actual_options(savedoptbuf, optbuf,
 137                     special, mountp);
 138         return (0);
 139 }
 140
 141 void
 142 usage(void)
 143 {
 144         (void) fprintf(stderr,
 145             "Usage: mount [-Ormq] [-o options] special mountpoint\n");
 146         exit(RET_ERR);
 147 }