287 lines
7.2 KiB
C
287 lines
7.2 KiB
C
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/* $NetBSD: mount_tmpfs.c,v 1.28 2014/04/30 01:33:11 christos Exp $ */
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/*
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* Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal, developed as part of Google's Summer of Code
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* 2005 program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: mount_tmpfs.c,v 1.28 2014/04/30 01:33:11 christos Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <fs/tmpfs/tmpfs_args.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <mntopts.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "mountprog.h"
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#include "mount_tmpfs.h"
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/* --------------------------------------------------------------------- */
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static const struct mntopt mopts[] = {
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MOPT_UPDATE,
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MOPT_STDOPTS,
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MOPT_GETARGS,
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MOPT_NULL,
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};
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/* --------------------------------------------------------------------- */
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static void usage(void) __dead;
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static int64_t ram_fract(const char *arg);
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static int64_t ram_percent(const char *arg);
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static int64_t ram_factor(float f);
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/* --------------------------------------------------------------------- */
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/* return f * available system ram */
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static int64_t
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ram_factor(float f)
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{
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uint64_t ram;
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size_t len;
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len = sizeof(ram);
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if (sysctlbyname("hw.physmem64", &ram, &len, NULL, 0))
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err(EXIT_FAILURE, "can't get \"hw.physmem64\"");
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return (int64_t)((float)ram * f);
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}
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/* return fraction of available ram given by arg */
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static int64_t
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ram_fract(const char *arg)
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{
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char *endp;
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float f;
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f = strtof(arg, &endp);
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if (endp && *endp != 0)
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errx(EXIT_FAILURE, "syntax error in ram fraction: ram/%s"
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" at %s", arg, endp);
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if (f <= 0.0f)
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errx(EXIT_FAILURE, "ram fraction must be a positive number:"
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" ram/%s", arg);
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return ram_factor(1.0f/f);
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}
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/* --------------------------------------------------------------------- */
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/* return percentage of available ram given by arg */
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static int64_t
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ram_percent(const char *arg)
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{
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char *endp;
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float f;
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f = strtof(arg, &endp);
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if (endp && *endp != 0)
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errx(EXIT_FAILURE, "syntax error in ram percentage: ram%%%s"
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" at %s", arg, endp);
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if (f <= 0.0f || f >= 100.0f)
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errx(EXIT_FAILURE, "ram percentage must be a between 0 and 100"
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" ram%%%s", arg);
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return ram_factor(f/100.0f);
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}
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/* --------------------------------------------------------------------- */
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void
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mount_tmpfs_parseargs(int argc, char *argv[],
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struct tmpfs_args *args, int *mntflags,
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char *canon_dev, char *canon_dir)
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{
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int gidset, modeset, uidset; /* Ought to be 'bool'. */
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int ch;
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gid_t gid;
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uid_t uid;
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mode_t mode;
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int64_t tmpnumber;
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mntoptparse_t mp;
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struct stat sb;
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/* Set default values for mount point arguments. */
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memset(args, 0, sizeof(*args));
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args->ta_version = TMPFS_ARGS_VERSION;
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args->ta_size_max = 0;
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args->ta_nodes_max = 0;
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*mntflags = 0;
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gidset = 0; gid = 0;
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uidset = 0; uid = 0;
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modeset = 0; mode = 0;
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optind = optreset = 1;
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while ((ch = getopt(argc, argv, "g:m:n:o:s:u:")) != -1 ) {
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switch (ch) {
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case 'g':
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gid = a_gid(optarg);
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gidset = 1;
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break;
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case 'm':
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mode = a_mask(optarg);
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modeset = 1;
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break;
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case 'n':
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if (dehumanize_number(optarg, &tmpnumber) == -1)
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err(EXIT_FAILURE, "failed to parse nodes `%s'",
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optarg);
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args->ta_nodes_max = tmpnumber;
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break;
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case 'o':
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mp = getmntopts(optarg, mopts, mntflags, 0);
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if (mp == NULL)
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err(EXIT_FAILURE, "getmntopts");
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freemntopts(mp);
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break;
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case 's':
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if (strncmp(optarg, "ram/", 4) == 0)
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tmpnumber = ram_fract(optarg+4);
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else if (strncmp(optarg, "ram%", 4) == 0)
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tmpnumber = ram_percent(optarg+4);
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else if (dehumanize_number(optarg, &tmpnumber) == -1)
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err(EXIT_FAILURE, "failed to parse size `%s'",
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optarg);
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args->ta_size_max = tmpnumber;
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break;
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case 'u':
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uid = a_uid(optarg);
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uidset = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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strlcpy(canon_dev, argv[0], MAXPATHLEN);
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pathadj(argv[1], canon_dir);
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if (stat(canon_dir, &sb) == -1)
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err(EXIT_FAILURE, "cannot stat `%s'", canon_dir);
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args->ta_root_uid = uidset ? uid : sb.st_uid;
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args->ta_root_gid = gidset ? gid : sb.st_gid;
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args->ta_root_mode = modeset ? mode : sb.st_mode;
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}
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/* --------------------------------------------------------------------- */
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: %s [-g group] [-m mode] [-n nodes] [-o options] [-s size]\n"
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" [-u user] tmpfs mount_point\n", getprogname());
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exit(1);
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}
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/* --------------------------------------------------------------------- */
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int
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mount_tmpfs(int argc, char *argv[])
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{
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struct tmpfs_args args;
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char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
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int mntflags;
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mount_tmpfs_parseargs(argc, argv, &args, &mntflags,
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canon_dev, canon_dir);
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if (mount(MOUNT_TMPFS, canon_dir, mntflags, &args, sizeof args) == -1)
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err(EXIT_FAILURE, "tmpfs on %s", canon_dir);
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if (mntflags & MNT_GETARGS) {
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struct passwd *pw;
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struct group *gr;
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(void)printf("version=%d, ", args.ta_version);
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(void)printf("size_max=%" PRIuMAX ", ",
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(uintmax_t)args.ta_size_max);
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(void)printf("nodes_max=%" PRIuMAX ", ",
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(uintmax_t)args.ta_nodes_max);
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pw = getpwuid(args.ta_root_uid);
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if (pw == NULL)
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(void)printf("root_uid=%" PRIuMAX ", ",
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(uintmax_t)args.ta_root_uid);
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else
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(void)printf("root_uid=%s, ", pw->pw_name);
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gr = getgrgid(args.ta_root_gid);
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if (gr == NULL)
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(void)printf("root_gid=%" PRIuMAX ", ",
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(uintmax_t)args.ta_root_gid);
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else
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(void)printf("root_gid=%s, ", gr->gr_name);
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(void)printf("root_mode=%o\n", args.ta_root_mode);
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}
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return EXIT_SUCCESS;
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}
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#ifndef MOUNT_NOMAIN
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int
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main(int argc, char *argv[])
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{
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setprogname(argv[0]);
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return mount_tmpfs(argc, argv);
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}
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#endif
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