/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1997 Doug Rabson
 * 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.
 */
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void
check_path(const char *kldname, const struct kld_file_stat *kldst)
{
    struct stat st1, st2;

    if (strchr(kldname, '/') != NULL || strstr(kldname, ".ko") == NULL)
        return;
    if (stat(kldname, &st1) != 0)
        return;
    if (stat(kldst->pathname, &st2) != 0)
        return;

    if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
        warnx("module %s was loaded from %s, not the current directory",
            kldname, kldst->pathname);
}

static void
usage(void)
{
    fprintf(stderr, "usage: kldload [-nv] file ...\n");
    exit(1);
}

int
main(int argc, char **argv)
{
    int c;
    int errors;
    int fileid;
    int verbose;
    int check_loaded;
    struct kld_file_stat kldst;

    errors = 0;
    verbose = 0;
    check_loaded = 0;
    kldst.version = sizeof(struct kld_file_stat);

    while ((c = getopt(argc, argv, "nv")) != -1)
        switch (c) {
        case 'n':
            check_loaded = 1;
            break;
        case 'v':
            verbose = 1;
            break;
        default:
            usage();
        }
    argc -= optind;
    argv += optind;

    if (argc == 0)
        usage();

    while (argc-- != 0) {
        fileid = kldload(argv[0]);
        if (fileid < 0) {
            if (check_loaded != 0 && errno == EEXIST) {
                if (verbose)
                    printf("%s is already loaded\n", argv[0]);
            } else {
                switch (errno) {
                case EEXIST:
                    warnx("can't load %s: module already loaded or "
                        "in kernel", argv[0]);
                    break;
                case ENOEXEC:
                    warnx("an error occurred while loading module %s. "
                        "Please check dmesg(8) for more details.", argv[0]);
                    break;
                default:
                    warn("can't load %s", argv[0]);
                    break;
                }
                errors++;
            }
        } else {
            if (kldstat(fileid, &kldst) != 0)
                warn("kldstat(id=%d)", fileid);
            if (verbose)
                printf("Loaded %s, id=%d, path=%s\n", argv[0], fileid,
                    kldst.pathname);
            check_path(argv[0], &kldst);
        }
        argv++;
    }

    return errors ? 1 : 0;
}