/*      $NetBSD: fsutil.c,v 1.27 2020/04/03 19:36:32 joerg Exp $        */

/*
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: fsutil.c,v 1.27 2020/04/03 19:36:32 joerg Exp $");
#endif /* not lint */

/*
 * used by sbin/fsck
 * used by sbin/fsck_ext2fs
 * used by sbin/fsck_ffs
 * used by sbin/fsck_lfs
 * used by sbin/fsck_msdos
 * used by sbin/fsck_v7fs
 * used by sbin/fsdb
 * used by usr.sbin/quotacheck
 */

#include <sys/param.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <fstab.h>
#include <fcntl.h>
#include <unistd.h>
#include <err.h>
#include <util.h>

#include <sys/types.h>
#include <sys/stat.h>

#include "fsutil.h"
#include "exitvalues.h"

volatile sig_atomic_t returntosingle;

void (*ckfinish)(int);

static const char *dev = NULL;
static int hot = 0;
static int preen = 0;
int quiet;                      /* don't report clean filesystems */
#define F_ERROR 0x80000000

void
setcdevname(const char *cd, int pr)
{

        dev = cd;
        preen = pr;
}

const char *
cdevname(void)
{

        return dev;
}

int
hotroot(void)
{

        return hot;
}

/*VARARGS*/
void
errexit(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        (void) vfprintf(stderr, fmt, ap);
        va_end(ap);
        (void)fprintf(stderr, "\n");
        exit(FSCK_EXIT_CHECK_FAILED);
}

void
vmsg(int fatal, const char *fmt, va_list ap)
{
        int serr = fatal & F_ERROR;
        int serrno = errno;
        fatal &= ~F_ERROR;

        if (!fatal && preen)
                (void)printf("%s: ", dev);
        if (quiet && !preen) {
                (void)printf("** %s (vmsg)\n", dev);
                quiet = 0;
        }

        (void) vprintf(fmt, ap);
        if (serr) 
                printf(" (%s)", strerror(serrno));

        if (fatal && preen)
                (void) printf("\n");

        if (fatal && preen) {
                (void) printf(
                    "%s: UNEXPECTED INCONSISTENCY; RUN %s MANUALLY.\n",
                    dev, getprogname());
                exit(FSCK_EXIT_CHECK_FAILED);
        }
}

/*VARARGS*/
void
pfatal(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        vmsg(1, fmt, ap);
        va_end(ap);
}

/*VARARGS*/
void
pwarn(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        vmsg(0, fmt, ap);
        va_end(ap);
}

void
perr(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        vmsg(1 | F_ERROR, fmt, ap);
        va_end(ap);
}

void
panic(const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        vmsg(1, fmt, ap);
        va_end(ap);
        exit(FSCK_EXIT_CHECK_FAILED);
}

const char *
blockcheck(const char *origname)
{
        struct stat stslash, stblock, stchar;
        const char *newname, *raw, *cooked;
        struct fstab *fsp;
        int retried = 0;
        ssize_t len;
        char cbuf[MAXPATHLEN];
        static char buf[MAXPATHLEN];

        hot = 0;
        if (stat("/", &stslash) < 0) {
                perr("Can't stat `/'");
                return (origname);
        }
        len = readlink(origname, cbuf, sizeof(cbuf)-1);
        if (len == -1) {
                newname = origname;
        } else {
                cbuf[len] = '\0';
                newname = cbuf;
        }
retry:
        if (stat(newname, &stblock) < 0) {
                perr("Can't stat `%s'", newname);
                return origname;
        }
        if (S_ISBLK(stblock.st_mode)) {
                if (stslash.st_dev == stblock.st_rdev)
                        hot++;
                raw = getdiskrawname(buf, sizeof(buf), newname);
                if (raw == NULL) {
                        perr("Can't convert to raw `%s'", newname);
                        return origname;
                }
                if (stat(raw, &stchar) < 0) {
                        perr("Can't stat `%s'", raw);
                        return origname;
                }
                if (S_ISCHR(stchar.st_mode)) {
                        return raw;
                } else {
                        perr("%s is not a character device\n", raw);
                        return origname;
                }
        } else if (S_ISCHR(stblock.st_mode) && !retried) {
                cooked = getdiskcookedname(cbuf, sizeof(cbuf), newname);
                if (cooked == NULL) {
                        perr("Can't convert to cooked `%s'", newname);
                        return origname;
                } else
                        newname = cooked;
                retried++;
                goto retry;
        } else if ((fsp = getfsfile(newname)) != 0 && !retried) {
                newname = getfsspecname(cbuf, sizeof(cbuf), fsp->fs_spec);
                if (newname == NULL)
                        perr("%s", buf);
                retried++;
                goto retry;
        }
        /*
         * Not a block or character device, just return name and
         * let the user decide whether to use it.
         */
        return origname;
}

const char *
print_mtime(time_t t)
{
        static char b[128];
        char *p = ctime(&t);
        if (p != NULL)
                (void)snprintf(b, sizeof(b), "%12.12s %4.4s ", &p[4], &p[20]);
        else
                (void)snprintf(b, sizeof(b), "%lld ", (long long)t);
        return b;
}


void
catch(int n)
{
        if (ckfinish) (*ckfinish)(0);
        _exit(FSCK_EXIT_SIGNALLED);
}

/*
 * When preening, allow a single quit to signal
 * a special exit after filesystem checks complete
 * so that reboot sequence may be interrupted.
 */
void
catchquit(int n)
{
        static const char msg[] =
            "returning to single-user after filesystem check\n";
        int serrno = errno;

        (void)write(STDOUT_FILENO, msg, sizeof(msg) - 1);
        returntosingle = 1;
        (void)signal(SIGQUIT, SIG_DFL);
        errno = serrno;
}

/*
 * Ignore a single quit signal; wait and flush just in case.
 * Used by child processes in preen.
 */
void
voidquit(int n)
{
        int serrno = errno;

        sleep(1);
        (void)signal(SIGQUIT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_DFL);
        errno = serrno;
}