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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2001 Dima Dorfman.
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*/
/*
* mdmfs (md/MFS) is a wrapper around mdconfig(8),
* newfs(8), and mount(8) that mimics the command line option set of
* the deprecated mount_mfs(8).
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/mdioctl.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <inttypes.h>
#include <paths.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
typedef enum { false, true } bool;
struct mtpt_info {
uid_t mi_uid;
bool mi_have_uid;
gid_t mi_gid;
bool mi_have_gid;
mode_t mi_mode;
bool mi_have_mode;
bool mi_forced_pw;
};
static bool debug; /* Emit debugging information? */
static bool loudsubs; /* Suppress output from helper programs? */
static bool norun; /* Actually run the helper programs? */
static int unit; /* The unit we're working with. */
static const char *mdname; /* Name of memory disk device (e.g., "md"). */
static const char *mdsuffix; /* Suffix of memory disk device (e.g., ".uzip"). */
static size_t mdnamelen; /* Length of mdname. */
static const char *path_mdconfig =_PATH_MDCONFIG;
static void argappend(char **, const char *, ...) __printflike(2, 3);
static void debugprintf(const char *, ...) __printflike(1, 2);
static void do_mdconfig_attach(const char *, const enum md_types);
static void do_mdconfig_attach_au(const char *, const enum md_types);
static void do_mdconfig_detach(void);
static void do_mount_md(const char *, const char *);
static void do_mount_tmpfs(const char *, const char *);
static void do_mtptsetup(const char *, struct mtpt_info *);
static void do_newfs(const char *);
static void do_copy(const char *, const char *);
static void extract_ugid(const char *, struct mtpt_info *);
static int run(int *, const char *, ...) __printflike(2, 3);
static const char *run_exitstr(int);
static int run_exitnumber(int);
static void usage(void);
int
main(int argc, char **argv)
{
struct mtpt_info mi; /* Mountpoint info. */
intmax_t mdsize;
char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */
*mount_arg;
enum md_types mdtype; /* The type of our memory disk. */
bool have_mdtype, mlmac;
bool detach, softdep, autounit, newfs;
const char *mtpoint, *size_arg, *skel, *unitstr;
char *p;
int ch, idx;
void *set;
unsigned long ul;
/* Misc. initialization. */
(void)memset(&mi, '\0', sizeof(mi));
detach = true;
softdep = true;
autounit = false;
mlmac = false;
newfs = true;
have_mdtype = false;
skel = NULL;
mdtype = MD_SWAP;
mdname = MD_NAME;
mdnamelen = strlen(mdname);
mdsize = 0;
/*
* Can't set these to NULL. They may be passed to the
* respective programs without modification. I.e., we may not
* receive any command-line options which will caused them to
* be modified.
*/
mdconfig_arg = strdup("");
newfs_arg = strdup("");
mount_arg = strdup("");
size_arg = NULL;
/* If we were started as mount_mfs or mfs, imply -C. */
if (strcmp(getprogname(), "mount_mfs") == 0 ||
strcmp(getprogname(), "mfs") == 0) {
/* Make compatibility assumptions. */
mi.mi_mode = 01777;
mi.mi_have_mode = true;
}
while ((ch = getopt(argc, argv,
"a:b:Cc:Dd:E:e:F:f:hi:k:LlMm:NnO:o:Pp:Ss:tT:Uv:w:X")) != -1)
switch (ch) {
case 'a':
argappend(&newfs_arg, "-a %s", optarg);
break;
case 'b':
argappend(&newfs_arg, "-b %s", optarg);
break;
case 'C':
/* Ignored for compatibility. */
break;
case 'c':
argappend(&newfs_arg, "-c %s", optarg);
break;
case 'D':
detach = false;
break;
case 'd':
argappend(&newfs_arg, "-d %s", optarg);
break;
case 'E':
path_mdconfig = optarg;
break;
case 'e':
argappend(&newfs_arg, "-e %s", optarg);
break;
case 'F':
if (have_mdtype)
usage();
mdtype = MD_VNODE;
have_mdtype = true;
argappend(&mdconfig_arg, "-f %s", optarg);
break;
case 'f':
argappend(&newfs_arg, "-f %s", optarg);
break;
case 'h':
usage();
break;
case 'i':
argappend(&newfs_arg, "-i %s", optarg);
break;
case 'k':
skel = optarg;
break;
case 'L':
loudsubs = true;
break;
case 'l':
mlmac = true;
argappend(&newfs_arg, "-l");
break;
case 'M':
if (have_mdtype)
usage();
mdtype = MD_MALLOC;
have_mdtype = true;
argappend(&mdconfig_arg, "-o reserve");
break;
case 'm':
argappend(&newfs_arg, "-m %s", optarg);
break;
case 'N':
norun = true;
break;
case 'n':
argappend(&newfs_arg, "-n");
break;
case 'O':
argappend(&newfs_arg, "-o %s", optarg);
break;
case 'o':
argappend(&mount_arg, "-o %s", optarg);
break;
case 'P':
newfs = false;
break;
case 'p':
if ((set = setmode(optarg)) == NULL)
usage();
mi.mi_mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
mi.mi_have_mode = true;
mi.mi_forced_pw = true;
free(set);
break;
case 'S':
softdep = false;
break;
case 's':
size_arg = optarg;
break;
case 't':
argappend(&newfs_arg, "-t");
break;
case 'T':
argappend(&mount_arg, "-t %s", optarg);
break;
case 'U':
softdep = true;
break;
case 'v':
argappend(&newfs_arg, "-O %s", optarg);
break;
case 'w':
extract_ugid(optarg, &mi);
mi.mi_forced_pw = true;
break;
case 'X':
debug = true;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
/*
* Historically our size arg was passed directly to mdconfig, which
* treats a number without a suffix as a count of 512-byte sectors;
* tmpfs would treat it as a count of bytes. To get predictable
* behavior for 'auto' we document that the size always uses mdconfig
* rules. To make that work, decode the size here so it can be passed
* to either tmpfs or mdconfig as a count of bytes.
*/
if (size_arg != NULL) {
mdsize = (intmax_t)strtoumax(size_arg, &p, 0);
if (p == size_arg || (p[0] != 0 && p[1] != 0) || mdsize < 0)
errx(1, "invalid size '%s'", size_arg);
switch (*p) {
case 'p':
case 'P':
mdsize *= 1024;
case 't':
case 'T':
mdsize *= 1024;
case 'g':
case 'G':
mdsize *= 1024;
case 'm':
case 'M':
mdsize *= 1024;
case 'k':
case 'K':
mdsize *= 1024;
case 'b':
case 'B':
break;
case '\0':
mdsize *= 512;
break;
default:
errx(1, "invalid size suffix on '%s'", size_arg);
}
}
/*
* Based on the command line 'md-device' either mount a tmpfs filesystem
* or configure the md device then format and mount a filesystem on it.
* If the device is 'auto' use tmpfs if it is available and there is no
* request for multilabel MAC (which tmpfs does not support).
*/
unitstr = argv[0];
mtpoint = argv[1];
if (strcmp(unitstr, "auto") == 0) {
if (mlmac)
idx = -1; /* Must use md for mlmac. */
else if ((idx = modfind("tmpfs")) == -1)
idx = kldload("tmpfs");
if (idx == -1)
unitstr = "md";
else
unitstr = "tmpfs";
}
if (strcmp(unitstr, "tmpfs") == 0) {
if (size_arg != NULL && mdsize != 0)
argappend(&mount_arg, "-o size=%jd", mdsize);
do_mount_tmpfs(mount_arg, mtpoint);
} else {
if (size_arg != NULL)
argappend(&mdconfig_arg, "-s %jdB", mdsize);
if (strncmp(unitstr, "/dev/", 5) == 0)
unitstr += 5;
if (strncmp(unitstr, mdname, mdnamelen) == 0)
unitstr += mdnamelen;
if (!isdigit(*unitstr)) {
autounit = true;
unit = -1;
mdsuffix = unitstr;
} else {
ul = strtoul(unitstr, &p, 10);
if (ul == ULONG_MAX)
errx(1, "bad device unit: %s", unitstr);
unit = ul;
mdsuffix = p; /* can be empty */
}
if (!have_mdtype)
mdtype = MD_SWAP;
if (softdep)
argappend(&newfs_arg, "-U");
if (mdtype != MD_VNODE && !newfs)
errx(1, "-P requires a vnode-backed disk");
/* Do the work. */
if (detach && !autounit)
do_mdconfig_detach();
if (autounit)
do_mdconfig_attach_au(mdconfig_arg, mdtype);
else
do_mdconfig_attach(mdconfig_arg, mdtype);
if (newfs)
do_newfs(newfs_arg);
do_mount_md(mount_arg, mtpoint);
}
do_mtptsetup(mtpoint, &mi);
if (skel != NULL)
do_copy(mtpoint, skel);
return (0);
}
/*
* Append the expansion of 'fmt' to the buffer pointed to by '*dstp';
* reallocate as required.
*/
static void
argappend(char **dstp, const char *fmt, ...)
{
char *old, *new;
va_list ap;
old = *dstp;
assert(old != NULL);
va_start(ap, fmt);
if (vasprintf(&new, fmt,ap) == -1)
errx(1, "vasprintf");
va_end(ap);
*dstp = new;
if (asprintf(&new, "%s %s", old, new) == -1)
errx(1, "asprintf");
free(*dstp);
free(old);
*dstp = new;
}
/*
* If run-time debugging is enabled, print the expansion of 'fmt'.
* Otherwise, do nothing.
*/
static void
debugprintf(const char *fmt, ...)
{
va_list ap;
if (!debug)
return;
fprintf(stderr, "DEBUG: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
fflush(stderr);
}
/*
* Attach a memory disk with a known unit.
*/
static void
do_mdconfig_attach(const char *args, const enum md_types mdtype)
{
int rv;
const char *ta; /* Type arg. */
switch (mdtype) {
case MD_SWAP:
ta = "-t swap";
break;
case MD_VNODE:
ta = "-t vnode";
break;
case MD_MALLOC:
ta = "-t malloc";
break;
default:
abort();
}
rv = run(NULL, "%s -a %s%s -u %s%d", path_mdconfig, ta, args,
mdname, unit);
if (rv)
errx(1, "mdconfig (attach) exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
* Attach a memory disk with an unknown unit; use autounit.
*/
static void
do_mdconfig_attach_au(const char *args, const enum md_types mdtype)
{
const char *ta; /* Type arg. */
char *linep;
char linebuf[12]; /* 32-bit unit (10) + '\n' (1) + '\0' (1) */
int fd; /* Standard output of mdconfig invocation. */
FILE *sfd;
int rv;
char *p;
size_t linelen;
unsigned long ul;
switch (mdtype) {
case MD_SWAP:
ta = "-t swap";
break;
case MD_VNODE:
ta = "-t vnode";
break;
case MD_MALLOC:
ta = "-t malloc";
break;
default:
abort();
}
rv = run(&fd, "%s -a %s%s", path_mdconfig, ta, args);
if (rv)
errx(1, "mdconfig (attach) exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
/* Receive the unit number. */
if (norun) { /* Since we didn't run, we can't read. Fake it. */
unit = 0;
return;
}
sfd = fdopen(fd, "r");
if (sfd == NULL)
err(1, "fdopen");
linep = fgetln(sfd, &linelen);
/* If the output format changes, we want to know about it. */
if (linep == NULL || linelen <= mdnamelen + 1 ||
linelen - mdnamelen >= sizeof(linebuf) ||
strncmp(linep, mdname, mdnamelen) != 0)
errx(1, "unexpected output from mdconfig (attach)");
linep += mdnamelen;
linelen -= mdnamelen;
/* Can't use strlcpy because linep is not NULL-terminated. */
strncpy(linebuf, linep, linelen);
linebuf[linelen] = '\0';
ul = strtoul(linebuf, &p, 10);
if (ul == ULONG_MAX || *p != '\n')
errx(1, "unexpected output from mdconfig (attach)");
unit = ul;
fclose(sfd);
}
/*
* Detach a memory disk.
*/
static void
do_mdconfig_detach(void)
{
int rv;
rv = run(NULL, "%s -d -u %s%d", path_mdconfig, mdname, unit);
if (rv && debug) /* This is allowed to fail. */
warnx("mdconfig (detach) exited %s %d (ignored)",
run_exitstr(rv), run_exitnumber(rv));
}
/*
* Mount the configured memory disk.
*/
static void
do_mount_md(const char *args, const char *mtpoint)
{
int rv;
rv = run(NULL, "%s%s /dev/%s%d%s %s", _PATH_MOUNT, args,
mdname, unit, mdsuffix, mtpoint);
if (rv)
errx(1, "mount exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
* Mount the configured tmpfs.
*/
static void
do_mount_tmpfs(const char *args, const char *mtpoint)
{
int rv;
rv = run(NULL, "%s -t tmpfs %s tmp %s", _PATH_MOUNT, args, mtpoint);
if (rv)
errx(1, "tmpfs mount exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
* Various configuration of the mountpoint. Mostly, enact 'mip'.
*/
static void
do_mtptsetup(const char *mtpoint, struct mtpt_info *mip)
{
struct statfs sfs;
if (!mip->mi_have_mode && !mip->mi_have_uid && !mip->mi_have_gid)
return;
if (!norun) {
if (statfs(mtpoint, &sfs) == -1) {
warn("statfs: %s", mtpoint);
return;
}
if ((sfs.f_flags & MNT_RDONLY) != 0) {
if (mip->mi_forced_pw) {
warnx(
"Not changing mode/owner of %s since it is read-only",
mtpoint);
} else {
debugprintf(
"Not changing mode/owner of %s since it is read-only",
mtpoint);
}
return;
}
}
if (mip->mi_have_mode) {
debugprintf("changing mode of %s to %o.", mtpoint,
mip->mi_mode);
if (!norun)
if (chmod(mtpoint, mip->mi_mode) == -1)
err(1, "chmod: %s", mtpoint);
}
/*
* We have to do these separately because the user may have
* only specified one of them.
*/
if (mip->mi_have_uid) {
debugprintf("changing owner (user) or %s to %u.", mtpoint,
mip->mi_uid);
if (!norun)
if (chown(mtpoint, mip->mi_uid, -1) == -1)
err(1, "chown %s to %u (user)", mtpoint,
mip->mi_uid);
}
if (mip->mi_have_gid) {
debugprintf("changing owner (group) or %s to %u.", mtpoint,
mip->mi_gid);
if (!norun)
if (chown(mtpoint, -1, mip->mi_gid) == -1)
err(1, "chown %s to %u (group)", mtpoint,
mip->mi_gid);
}
}
/*
* Put a file system on the memory disk.
*/
static void
do_newfs(const char *args)
{
int rv;
rv = run(NULL, "%s%s /dev/%s%d", _PATH_NEWFS, args, mdname, unit);
if (rv)
errx(1, "newfs exited %s %d", run_exitstr(rv),
run_exitnumber(rv));
}
/*
* Copy skel into the mountpoint.
*/
static void
do_copy(const char *mtpoint, const char *skel)
{
int rv;
rv = chdir(skel);
if (rv != 0)
err(1, "chdir to %s", skel);
rv = run(NULL, "/bin/pax -rw -pe . %s", mtpoint);
if (rv != 0)
errx(1, "skel copy failed");
}
/*
* 'str' should be a user and group name similar to the last argument
* to chown(1); i.e., a user, followed by a colon, followed by a
* group. The user and group in 'str' may be either a [ug]id or a
* name. Upon return, the uid and gid fields in 'mip' will contain
* the uid and gid of the user and group name in 'str', respectively.
*
* In other words, this derives a user and group id from a string
* formatted like the last argument to chown(1).
*
* Notice: At this point we don't support only a username or only a
* group name. do_mtptsetup already does, so when this feature is
* desired, this is the only routine that needs to be changed.
*/
static void
extract_ugid(const char *str, struct mtpt_info *mip)
{
char *ug; /* Writable 'str'. */
char *user, *group; /* Result of extracton. */
struct passwd *pw;
struct group *gr;
char *p;
uid_t *uid;
gid_t *gid;
uid = &mip->mi_uid;
gid = &mip->mi_gid;
mip->mi_have_uid = mip->mi_have_gid = false;
/* Extract the user and group from 'str'. Format above. */
ug = strdup(str);
assert(ug != NULL);
group = ug;
user = strsep(&group, ":");
if (user == NULL || group == NULL || *user == '\0' || *group == '\0')
usage();
/* Derive uid. */
*uid = strtoul(user, &p, 10);
if (*uid == (uid_t)ULONG_MAX)
usage();
if (*p != '\0') {
pw = getpwnam(user);
if (pw == NULL)
errx(1, "invalid user: %s", user);
*uid = pw->pw_uid;
}
mip->mi_have_uid = true;
/* Derive gid. */
*gid = strtoul(group, &p, 10);
if (*gid == (gid_t)ULONG_MAX)
usage();
if (*p != '\0') {
gr = getgrnam(group);
if (gr == NULL)
errx(1, "invalid group: %s", group);
*gid = gr->gr_gid;
}
mip->mi_have_gid = true;
free(ug);
}
/*
* Run a process with command name and arguments pointed to by the
* formatted string 'cmdline'. Since system(3) is not used, the first
* space-delimited token of 'cmdline' must be the full pathname of the
* program to run.
*
* The return value is the return code of the process spawned, or a negative
* signal number if the process exited due to an uncaught signal.
*
* If 'ofd' is non-NULL, it is set to the standard output of
* the program spawned (i.e., you can read from ofd and get the output
* of the program).
*/
static int
run(int *ofd, const char *cmdline, ...)
{
char **argv, **argvp; /* Result of splitting 'cmd'. */
int argc;
char *cmd; /* Expansion of 'cmdline'. */
int pid, status; /* Child info. */
int pfd[2]; /* Pipe to the child. */
int nfd; /* Null (/dev/null) file descriptor. */
bool dup2dn; /* Dup /dev/null to stdout? */
va_list ap;
char *p;
int rv, i;
dup2dn = true;
va_start(ap, cmdline);
rv = vasprintf(&cmd, cmdline, ap);
if (rv == -1)
err(1, "vasprintf");
va_end(ap);
/* Split up 'cmd' into 'argv' for use with execve. */
for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++)
argc++; /* 'argc' generation loop. */
argv = (char **)malloc(sizeof(*argv) * (argc + 1));
assert(argv != NULL);
for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;)
if (**argvp != '\0')
if (++argvp >= &argv[argc]) {
*argvp = NULL;
break;
}
assert(*argv);
/* The argv array ends up NULL-terminated here. */
/* Make sure the above loop works as expected. */
if (debug) {
/*
* We can't, but should, use debugprintf here. First,
* it appends a trailing newline to the output, and
* second it prepends "DEBUG: " to the output. The
* former is a problem for this would-be first call,
* and the latter for the would-be call inside the
* loop.
*/
(void)fprintf(stderr, "DEBUG: running:");
/* Should be equivalent to 'cmd' (before strsep, of course). */
for (i = 0; argv[i] != NULL; i++)
(void)fprintf(stderr, " %s", argv[i]);
(void)fprintf(stderr, "\n");
}
/* Create a pipe if necessary and fork the helper program. */
if (ofd != NULL) {
if (pipe(&pfd[0]) == -1)
err(1, "pipe");
*ofd = pfd[0];
dup2dn = false;
}
pid = fork();
switch (pid) {
case 0:
/* XXX can we call err() in here? */
if (norun)
_exit(0);
if (ofd != NULL)
if (dup2(pfd[1], STDOUT_FILENO) < 0)
err(1, "dup2");
if (!loudsubs) {
nfd = open(_PATH_DEVNULL, O_RDWR);
if (nfd == -1)
err(1, "open: %s", _PATH_DEVNULL);
if (dup2(nfd, STDIN_FILENO) < 0)
err(1, "dup2");
if (dup2dn)
if (dup2(nfd, STDOUT_FILENO) < 0)
err(1, "dup2");
if (dup2(nfd, STDERR_FILENO) < 0)
err(1, "dup2");
}
(void)execv(argv[0], argv);
warn("exec: %s", argv[0]);
_exit(-1);
case -1:
err(1, "fork");
}
free(cmd);
free(argv);
while (waitpid(pid, &status, 0) != pid)
;
if (WIFEXITED(status))
return (WEXITSTATUS(status));
if (WIFSIGNALED(status))
return (-WTERMSIG(status));
err(1, "unexpected waitpid status: 0x%x", status);
}
/*
* If run() returns non-zero, provide a string explaining why.
*/
static const char *
run_exitstr(int rv)
{
if (rv > 0)
return ("with error code");
if (rv < 0)
return ("with signal");
return (NULL);
}
/*
* If run returns non-zero, provide a relevant number.
*/
static int
run_exitnumber(int rv)
{
if (rv < 0)
return (-rv);
return (rv);
}
static void
usage(void)
{
fprintf(stderr,
"usage: %s [-DLlMNnPStUX] [-a maxcontig] [-b block-size]\n"
"\t[-c blocks-per-cylinder-group][-d max-extent-size] [-E path-mdconfig]\n"
"\t[-e maxbpg] [-F file] [-f frag-size] [-i bytes] [-k skel]\n"
"\t[-m percent-free] [-O optimization] [-o mount-options]\n"
"\t[-p permissions] [-s size] [-v version] [-w user:group]\n"
"\tmd-device mount-point\n", getprogname());
exit(1);
}