sbin/mount_ptyfs/mount_ptyfs.c

   1 /*      $NetBSD: mount_ptyfs.c,v 1.9 2008/07/20 01:20:22 lukem Exp $    */
   2
   3 /*
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Jan-Simon Pendry.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 1990, 1992 Jan-Simon Pendry
  37  *
  38  * This code is derived from software contributed to Berkeley by
  39  * Jan-Simon Pendry.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *      This product includes software developed by the University of
  52  *      California, Berkeley and its contributors.
  53  * 4. Neither the name of the University nor the names of its contributors
  54  *    may be used to endorse or promote products derived from this software
  55  *    without specific prior written permission.
  56  *
  57  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  58  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  59  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  60  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  61  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  62  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  63  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  65  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  66  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  67  * SUCH DAMAGE.
  68  */
  69
  70 #include <sys/cdefs.h>
  71 #ifndef lint
  72 __COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
  73  The Regents of the University of California.  All rights reserved.");
  74 #endif /* not lint */
  75
  76 #ifndef lint
  77 #if 0
  78 static char sccsid[] = "@(#)mount_ptyfs.c       8.3 (Berkeley) 5/4/95";
  79 #else
  80 __RCSID("$NetBSD: mount_ptyfs.c,v 1.9 2008/07/20 01:20:22 lukem Exp $");
  81 #endif
  82 #endif /* not lint */
  83
  84 #include <sys/param.h>
  85 #include <sys/types.h>
  86 #include <sys/mount.h>
  87 #include <sys/stat.h>
  88
  89 #include <fs/ptyfs/ptyfs.h>
  90
  91 #include <err.h>
  92 #include <unistd.h>
  93 #include <stdio.h>
  94 #include <stdlib.h>
  95 #include <string.h>
  96 #include <grp.h>
  97 #include <util.h>
  98
  99 #include <mntopts.h>
 100
 101 #define ALTF_GROUP      1
 102 #define ALTF_MODE       2
 103 #define ALTF_CHROOT     3
 104
 105 static const struct mntopt mopts[] = {
 106         MOPT_STDOPTS,
 107         MOPT_GETARGS,
 108         { "group", 0, ALTF_GROUP, 1 },
 109         { "mode", 0, ALTF_MODE, 1 },
 110         { "chroot", 0, ALTF_CHROOT, 1 },
 111         MOPT_NULL,
 112 };
 113
 114 int     main(int, char *[]);
 115 int     mount_ptyfs(int argc, char **argv);
 116
 117 static gid_t    getgrp(const char *name);
 118 static void     usage(void);
 119
 120 #ifndef MOUNT_NOMAIN
 121 int
 122 main(int argc, char *argv[])
 123 {
 124         return mount_ptyfs(argc, argv);
 125 }
 126 #endif
 127
 128 static gid_t
 129 getgrp(const char *name)
 130 {
 131         char *ep;
 132         struct group *grp;
 133         long l;
 134
 135         if (name == NULL)
 136                 errx(1, "Missing group name");
 137
 138         l = strtol(name, &ep, 0);
 139
 140         if (name == ep || *ep)
 141                 grp = getgrnam(name);
 142         else
 143                 grp = getgrgid((gid_t)l);
 144
 145         if (grp == NULL)
 146                 errx(1, "Cannot find group `%s'", name);
 147
 148         return grp->gr_gid;
 149 }
 150
 151
 152 int
 153 mount_ptyfs(int argc, char *argv[])
 154 {
 155         int ch, mntflags = 0, altflags = 0;
 156         struct ptyfs_args args;
 157         mntoptparse_t mp;
 158         char canon_dir[MAXPATHLEN];
 159
 160
 161         setprogname(argv[0]);
 162
 163         args.version = PTYFS_ARGSVERSION;
 164         args.gid = getgrp("tty");
 165         args.mode = S_IRUSR|S_IWUSR|S_IWGRP;
 166         args.flags = 0;
 167
 168         while ((ch = getopt(argc, argv, "cg:m:o:")) != -1)
 169                 switch (ch) {
 170                 case 'o':
 171                         altflags = 0;
 172                         mp = getmntopts(optarg, mopts, &mntflags, &altflags);
 173                         if (mp == NULL)
 174                                 err(1, "getmntopts");
 175                         if (altflags & ALTF_GROUP)
 176                                 args.gid = getgrp(getmntoptstr(mp, "group"));
 177                         if (altflags & ALTF_MODE)
 178                                 args.mode = (mode_t)getmntoptnum(mp, "mode");
 179                         if (altflags & ALTF_CHROOT)
 180                                 args.flags |= PTYFSMNT_CHROOT;
 181                         freemntopts(mp);
 182                         break;
 183                 case 'c':
 184                         args.flags |= PTYFSMNT_CHROOT;
 185                         break;
 186                 case 'g':
 187                         args.gid = getgrp(optarg);
 188                         break;
 189                 case 'm':
 190                         args.mode = (mode_t)strtol(optarg, NULL, 0);
 191                         break;
 192                 case '?':
 193                 default:
 194                         usage();
 195                 }
 196
 197         argc -= optind;
 198         argv += optind;
 199
 200         if (argc != 2)
 201                 usage();
 202
 203         if (realpath(argv[1], canon_dir) == NULL)   /* Check mounton path */
 204                 err(1, "realpath %s", argv[1]);
 205         if (strncmp(argv[1], canon_dir, MAXPATHLEN)) {
 206                 warnx("\"%s\" is a relative path.", argv[1]);
 207                 warnx("using \"%s\" instead.", canon_dir);
 208         }
 209
 210         if (mount(MOUNT_PTYFS, canon_dir, mntflags, &args, sizeof args) == -1)
 211                 err(1, "ptyfs on %s", canon_dir);
 212         if (mntflags & MNT_GETARGS) {
 213                 char buf[1024];
 214                 (void)snprintb(buf, sizeof(buf), PTYFSMNT_BITS, args.flags);
 215                 printf("version=%d, flags=%s\n", args.version, buf);
 216                 printf("version=%d, gid=%lu, mode=0%o flags=%s\n", args.version,
 217                     (unsigned long)args.gid, args.mode, buf);
 218         }
 219         return 0;
 220 }
 221
 222 static void
 223 usage(void)
 224 {
 225         (void)fprintf(stderr,
 226             "Usage: %s [-c] [-g <group|gid>] [-m <mode>] [-o options] "
 227             "ptyfs mountpoint\n", getprogname());
 228         exit(1);
 229 }