/*      $NetBSD: fsck.c,v 1.53 2023/01/24 08:09:37 mlelstv Exp $        */

/*
 * Copyright (c) 1996 Christos Zoulas. All rights reserved.
 * Copyright (c) 1980, 1989, 1993, 1994
 *      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.
 *
 * From: @(#)mount.c    8.19 (Berkeley) 4/19/94
 * From: NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp 
 *
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: fsck.c,v 1.53 2023/01/24 08:09:37 mlelstv Exp $");
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/queue.h>
#include <sys/wait.h>
#define FSTYPENAMES
#define FSCKNAMES
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>

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

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

static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;

TAILQ_HEAD(fstypelist, entry) opthead, selhead, omhead;

struct entry {
        char *type;
        char *options;
        TAILQ_ENTRY(entry) entries;
};

static int maxrun = 0;
static char *options = NULL;
static int flags = 0;

static int checkfs(const char *, const char *, const char *, void *, pid_t *);
static int selected(const char *);
static int omitted(const char *);
static void addoption(char *);
static const char *getoptions(const char *);
static void addentry(struct fstypelist *, const char *, const char *);
static void maketypelist(char *);
static void catopt(char **, const char *);
static void mangle(char *, int *, const char ** volatile *, int *);
static const char *getfslab(const char *);
__dead static void usage(void);
static void *isok(struct fstab *);

int
main(int argc, char *argv[])
{
        struct fstab *fs;
        int i, rval;
        const char *vfstype = NULL;
        char globopt[3];
        int ret = FSCK_EXIT_OK;
        char buf[MAXPATHLEN];

        globopt[0] = '-';
        globopt[2] = '\0';

        TAILQ_INIT(&selhead);
        TAILQ_INIT(&opthead);
        TAILQ_INIT(&omhead);

        while ((i = getopt(argc, argv, "dfl:nPpqT:t:vx:y")) != -1) {
                switch (i) {
                case 'd':
                        flags |= CHECK_DEBUG;
                        continue;

                case 'f':
                        flags |= CHECK_FORCE;
                        break;

                case 'n':
                        flags |= CHECK_NOFIX;
                        break;

                case 'p':
                        flags |= CHECK_PREEN;
                        break;

                case 'P':
                        flags |= CHECK_PROGRESS;
                        break;

                case 'q':
                        break;

                case 'l':
                        maxrun = atoi(optarg);
                        continue;

                case 'T':
                        if (*optarg)
                                addoption(optarg);
                        continue;

                case 't':
                        if (TAILQ_FIRST(&selhead) != NULL)
                                errx(1, "only one -t option may be specified.");

                        maketypelist(optarg);
                        vfstype = optarg;
                        continue;

                case 'v':
                        flags |= CHECK_VERBOSE;
                        continue;

                case 'x':
                        addentry(&omhead, optarg, "");
                        continue;

                case 'y':
                        break;

                case '?':
                default:
                        usage();
                        /* NOTREACHED */
                }

                /* Pass option to fsck_xxxfs */
                globopt[1] = i;
                catopt(&options, globopt);
        }

        /* Don't do progress meters if we're debugging. */
        if (flags & CHECK_DEBUG)
                flags &= ~CHECK_PROGRESS;

        /*
         * If progress meters are being used, force max parallel to 1
         * so the progress meter outputs don't interfere with one another.
         */
        if (flags & CHECK_PROGRESS)
                maxrun = 1;

        argc -= optind;
        argv += optind;

        if (argc == 0)
                return checkfstab(flags, maxrun, isok, checkfs);

#define BADTYPE(type)                                                   \
        (strcmp(type, FSTAB_RO) &&                                      \
            strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))


        for (; argc--; argv++) {
                const char *spec, *spec2, *mntpt, *type, *cp;
                char    device[MAXPATHLEN];

                spec = mntpt = *argv;
                spec2 = getfsspecname(buf, sizeof(buf), spec);
                if (spec2 == NULL)
                        spec2 = spec;

                cp = strrchr(spec2, '/');
                if (cp == 0) {
                        (void)snprintf(device, sizeof(device), "%s%s",
                                _PATH_DEV, spec2);
                        spec2 = device;
                }

                fs = getfsfile(spec);
                if (fs == NULL)
                    fs = getfsspec(spec);
                if (fs == NULL && spec != spec2) {
                    fs = getfsspec(spec2);
                    spec = spec2;
                }

                if (fs) {
                        spec = getfsspecname(buf, sizeof(buf), fs->fs_spec);
                        if (spec == NULL)
                                err(FSCK_EXIT_CHECK_FAILED, "%s", buf);
                        type = fs->fs_vfstype;
                        if (BADTYPE(fs->fs_type))
                                errx(FSCK_EXIT_CHECK_FAILED,
                                    "%s has unknown file system type.",
                                    spec);
                } else {
                        if (vfstype == NULL)
                                vfstype = getfslab(spec);
                        type = vfstype;
                }

                rval = checkfs(type, blockcheck(spec), *argv, NULL, NULL);
                if (rval > ret) 
                        ret = rval;
        }

        return ret;
}


static void *
isok(struct fstab *fs)
{

        if (fs->fs_passno == 0)
                return NULL;

        if (BADTYPE(fs->fs_type))
                return NULL;

        if (!selected(fs->fs_vfstype))
                return NULL;

        if (omitted(fs->fs_file))
                return NULL;

        return fs;
}


static int
checkfs(const char *vfst, const char *spec, const char *mntpt, void *auxarg,
    pid_t *pidp)
{
        /* List of directories containing fsck_xxx subcommands. */
        static const char *edirs[] = {
#ifdef RESCUEDIR
                RESCUEDIR,
#endif
                _PATH_SBIN,
                _PATH_USRSBIN,
                NULL
        };
        const char ** volatile argv, **edir;
        const char * volatile vfstype = vfst;
        pid_t pid;
        int argc, i, status, maxargc;
        char *optb;
        char *volatile optbuf;
        char execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
        const char *extra = getoptions(vfstype);

        if (!strcmp(vfstype, "ufs"))
                vfstype = MOUNT_UFS;

        optb = NULL;
        if (options)
                catopt(&optb, options);
        if (extra)
                catopt(&optb, extra);
        optbuf = optb;

        maxargc = 64;
        argv = emalloc(sizeof(char *) * maxargc);

        (void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
        argc = 0;
        argv[argc++] = execbase;
        if (optbuf)
                mangle(optbuf, &argc, &argv, &maxargc);
        argv[argc++] = spec;
        argv[argc] = NULL;

        if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
                (void)printf("start %s %swait", mntpt, 
                        pidp ? "no" : "");
                for (i = 0; i < argc; i++)
                        (void)printf(" %s", argv[i]);
                (void)printf("\n");
        }

        switch (pid = vfork()) {
        case -1:                                /* Error. */
                warn("vfork");
                if (optbuf)
                        free(optbuf);
                free(argv);
                return FSCK_EXIT_CHECK_FAILED;

        case 0:                                 /* Child. */
                if ((flags & CHECK_FORCE) == 0) {
                        struct statvfs  sfs;

                                /*
                                 * if mntpt is a mountpoint of a mounted file
                                 * system and it's mounted read-write, skip it
                                 * unless -f is given.
                                 */
                        if ((statvfs(mntpt, &sfs) == 0) &&
                            (strcmp(mntpt, sfs.f_mntonname) == 0) &&
                            ((sfs.f_flag & MNT_RDONLY) == 0)) {
                                printf(
                "%s: file system is mounted read-write on %s; not checking\n",
                                    spec, mntpt);
                                if ((flags & CHECK_PREEN) && auxarg != NULL)
                                        _exit(FSCK_EXIT_OK);    /* fsck -p */
                                else
                                        _exit(FSCK_EXIT_CHECK_FAILED);  /* fsck [[-p] ...] */
                        }
                }

                if (flags & CHECK_DEBUG)
                        _exit(FSCK_EXIT_OK);

                /* Go find an executable. */
                edir = edirs;
                do {
                        (void)snprintf(execname,
                            sizeof(execname), "%s/%s", *edir, execbase);
                        execv(execname, (char * const *)__UNCONST(argv));
                        if (errno != ENOENT) {
                                if (spec)
                                        warn("exec %s for %s", execname, spec);
                                else
                                        warn("exec %s", execname);
                        }
                } while (*++edir != NULL);

                if (errno == ENOENT) {
                        if (spec)
                                warn("exec %s for %s", execname, spec);
                        else
                                warn("exec %s", execname);
                }
                _exit(FSCK_EXIT_CHECK_FAILED);
                /* NOTREACHED */

        default:                                /* Parent. */
                if (optbuf)
                        free(optbuf);
                free(argv);

                if (pidp) {
                        *pidp = pid;
                        return FSCK_EXIT_OK;
                }

                if (waitpid(pid, &status, 0) < 0) {
                        warn("waitpid");
                        return FSCK_EXIT_CHECK_FAILED;
                }

                if (WIFEXITED(status)) {
                        if (WEXITSTATUS(status) != 0)
                                return WEXITSTATUS(status);
                }
                else if (WIFSIGNALED(status)) {
                        warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
                        return FSCK_EXIT_CHECK_FAILED;
                }
                break;
        }

        return FSCK_EXIT_OK;
}


static int
selected(const char *type)
{
        struct entry *e;

        /* If no type specified, it's always selected. */
        TAILQ_FOREACH(e, &selhead, entries)
                if (!strcmp(e->type, type))
                        return which == IN_LIST ? 1 : 0;

        return which == IN_LIST ? 0 : 1;
}


static int
omitted(const char *mountedon)
{
        struct entry *e;

        /* If no type specified, it's always selected. */
        TAILQ_FOREACH(e, &omhead, entries)
                if (!strcmp(e->type, mountedon))
                        return 1;

        return 0;
}


static const char *
getoptions(const char *type)
{
        struct entry *e;

        TAILQ_FOREACH(e, &opthead, entries)
                if (!strcmp(e->type, type))
                        return e->options;
        return "";
}


static void
addoption(char *optstr)
{
        char *newoptions;
        struct entry *e;

        if ((newoptions = strchr(optstr, ':')) == NULL)
                errx(1, "Invalid option string");

        *newoptions++ = '\0';

        TAILQ_FOREACH(e, &opthead, entries)
                if (!strcmp(e->type, optstr)) {
                        catopt(&e->options, newoptions);
                        return;
                }
        addentry(&opthead, optstr, newoptions);
}


static void
addentry(struct fstypelist *list, const char *type, const char *opts)
{
        struct entry *e;

        e = emalloc(sizeof(struct entry));
        e->type = estrdup(type);
        e->options = estrdup(opts);
        TAILQ_INSERT_TAIL(list, e, entries);
}


static void
maketypelist(char *fslist)
{
        char *ptr;

        if ((fslist == NULL) || (fslist[0] == '\0'))
                errx(1, "empty type list");

        if (fslist[0] == 'n' && fslist[1] == 'o') {
                fslist += 2;
                which = NOT_IN_LIST;
        }
        else
                which = IN_LIST;

        while ((ptr = strsep(&fslist, ",")) != NULL)
                addentry(&selhead, ptr, "");

}


static void
catopt(char **sp, const char *o)
{
        char *s;
        size_t i, j;

        s = *sp;
        if (s) {
                i = strlen(s);
                j = i + 1 + strlen(o) + 1;
                s = erealloc(s, j);
                (void)snprintf(s + i, j, ",%s", o);
        } else
                s = estrdup(o);
        *sp = s;
}


static void
mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
{
        char *p, *s;
        int argc, maxargc;
        const char **argv;

        argc = *argcp;
        argv = *argvp;
        maxargc = *maxargcp;

        for (s = opts; (p = strsep(&s, ",")) != NULL;) {
                /* Always leave space for one more argument and the NULL. */
                if (argc >= maxargc - 3) {
                        maxargc <<= 1;
                        argv = erealloc(argv, maxargc * sizeof(char *));
                }
                if (*p != '\0')  {
                        if (*p == '-') {
                                argv[argc++] = p;
                                p = strchr(p, '=');
                                if (p) {
                                        *p = '\0';
                                        argv[argc++] = p+1;
                                }
                        } else {
                                argv[argc++] = "-o";
                                argv[argc++] = p;
                        }
                }
        }

        *argcp = argc;
        *argvp = argv;
        *maxargcp = maxargc;
}

static const char *
getfslab(const char *str)
{
        static struct dkwedge_info dkw;
        struct disklabel dl;
        int fd;
        char p;
        const char *vfstype;
        u_char t;
        char buf[MAXPATHLEN];

        /* deduce the file system type from the disk label */
        if ((fd = opendisk(str, O_RDONLY, buf, sizeof(buf), 0)) == -1)
                err(1, "cannot open `%s'", buf);

        /* First check to see if it's a wedge. */
        if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
                /* Yup, this is easy. */
                (void) close(fd);
                return (dkw.dkw_ptype);
        }

        if (ioctl(fd, DIOCGDINFO, &dl) == -1)
                err(1, "cannot get disklabel for `%s'", buf);

        (void) close(fd);

        p = buf[strlen(buf) - 1];

        if ((p - 'a') >= dl.d_npartitions)
                errx(1, "partition `%s' is not defined on disk", buf);

        if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES) 
                errx(1, "partition `%s' is not of a legal vfstype",
                    buf);

        if ((vfstype = fscknames[t]) == NULL)
                errx(1, "vfstype `%s' on partition `%s' is not supported",
                    fstypenames[t], buf);

        return vfstype;
}


static void
usage(void)
{
        static const char common[] =
            "[-dfnPpqvy] [-x excludemount] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";

        (void)fprintf(stderr, "usage: %s %s [special|node]...\n",
            getprogname(), common);
        exit(FSCK_EXIT_USAGE);
}