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/* $OpenBSD: mount_tmpfs.c,v 1.8 2022/12/04 23:50:47 cheloha Exp $ */
/* $NetBSD: mount_tmpfs.c,v 1.24 2008/08/05 20:57:45 pooka Exp $ */
/*
* Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julio M. Merino Vidal, developed as part of Google's Summer of Code
* 2005 program.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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/types.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <mntopts.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <util.h>
#include "mount_tmpfs.h"
/* --------------------------------------------------------------------- */
static const struct mntopt mopts[] = {
MOPT_STDOPTS,
MOPT_WXALLOWED,
MOPT_UPDATE,
{ NULL },
};
/* --------------------------------------------------------------------- */
static void usage(void) __dead;
static uid_t a_uid(const char *);
static gid_t a_gid(const char *);
static uid_t a_gid(const char *);
static int a_num(const char *, const char *);
static mode_t a_mask(const char *);
static void pathadj(const char *, char *);
/* --------------------------------------------------------------------- */
void
mount_tmpfs_parseargs(int argc, char *argv[],
struct tmpfs_args *args, int *mntflags,
char *canon_dev, char *canon_dir)
{
int gidset, modeset, uidset; /* Ought to be 'bool'. */
int ch;
gid_t gid;
uid_t uid;
mode_t mode;
int64_t tmpnumber;
struct stat sb;
/* Set default values for mount point arguments. */
memset(args, 0, sizeof(*args));
args->ta_version = TMPFS_ARGS_VERSION;
args->ta_size_max = 0;
args->ta_nodes_max = 0;
*mntflags = 0;
gidset = 0; gid = 0;
uidset = 0; uid = 0;
modeset = 0; mode = 0;
optind = optreset = 1;
while ((ch = getopt(argc, argv, "g:m:n:o:s:u:")) != -1 ) {
switch (ch) {
case 'g':
gid = a_gid(optarg);
gidset = 1;
break;
case 'm':
mode = a_mask(optarg);
modeset = 1;
break;
case 'n':
if (scan_scaled(optarg, &tmpnumber) == -1)
err(EXIT_FAILURE, "failed to parse nodes `%s'",
optarg);
args->ta_nodes_max = tmpnumber;
break;
case 'o':
getmntopts(optarg, mopts, mntflags);
break;
case 's':
if (scan_scaled(optarg, &tmpnumber) == -1)
err(EXIT_FAILURE, "failed to parse size `%s'",
optarg);
args->ta_size_max = tmpnumber;
break;
case 'u':
uid = a_uid(optarg);
uidset = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
strlcpy(canon_dev, argv[0], PATH_MAX);
pathadj(argv[1], canon_dir);
if (stat(canon_dir, &sb) == -1)
err(EXIT_FAILURE, "cannot stat `%s'", canon_dir);
args->ta_root_uid = uidset ? uid : sb.st_uid;
args->ta_root_gid = gidset ? gid : sb.st_gid;
args->ta_root_mode = modeset ? mode : sb.st_mode;
}
/* --------------------------------------------------------------------- */
static void
usage(void)
{
extern char *__progname;
(void)fprintf(stderr,
"usage: %s [-g group] [-m mode] [-n nodes] [-o options] [-s size]\n"
" [-u user] tmpfs mount_point\n", __progname);
exit(1);
}
/* --------------------------------------------------------------------- */
int
mount_tmpfs(int argc, char *argv[])
{
struct tmpfs_args args;
char canon_dev[PATH_MAX], canon_dir[PATH_MAX];
int mntflags;
mount_tmpfs_parseargs(argc, argv, &args, &mntflags,
canon_dev, canon_dir);
if (mount(MOUNT_TMPFS, canon_dir, mntflags, &args) == -1)
err(EXIT_FAILURE, "tmpfs on %s", canon_dir);
return EXIT_SUCCESS;
}
int
main(int argc, char *argv[])
{
/* setprogname(argv[0]); */
return mount_tmpfs(argc, argv);
}
static uid_t
a_uid(const char *s)
{
struct passwd *pw;
if ((pw = getpwnam(s)) != NULL)
return pw->pw_uid;
return a_num(s, "user");
}
static gid_t
a_gid(const char *s)
{
struct group *gr;
if ((gr = getgrnam(s)) != NULL)
return gr->gr_gid;
return a_num(s, "group");
}
static int
a_num(const char *s, const char *id_type)
{
int id;
char *ep;
id = strtol(s, &ep, 0);
if (*ep || s == ep || id < 0)
errx(1, "unknown %s id: %s", id_type, s);
return id;
}
static mode_t
a_mask(const char *s)
{
int rv;
char *ep;
rv = strtol(s, &ep, 8);
if (s == ep || *ep || rv < 0)
errx(1, "invalid file mode: %s", s);
return rv;
}
static void
pathadj(const char *input, char *adjusted)
{
if (realpath(input, adjusted) == NULL)
err(1, "realpath %s", input);
if (strncmp(input, adjusted, PATH_MAX)) {
warnx("\"%s\" is a relative path.", input);
warnx("using \"%s\" instead.", adjusted);
}
}
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