/*      $NetBSD: btkey.c,v 1.5 2021/08/25 22:52:25 rillig Exp $ */

/*-
 * Copyright (c) 2007 Iain Hibbert
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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>
__COPYRIGHT("@(#) Copyright (c) 2007 Iain Hibbert.  All rights reserved.");
__RCSID("$NetBSD: btkey.c,v 1.5 2021/08/25 22:52:25 rillig Exp $");

#include <bluetooth.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "btkey.h"

__dead static void usage(void);
static bool scan_key(const char *);

bdaddr_t laddr;
bdaddr_t raddr;
uint8_t key[HCI_KEY_SIZE];

int
main(int ac, char *av[])
{
        struct hostent *he;
        int ch;
        bool cf, cd, lf, ld, rf, rd, wf, wd, nk;

        memset(&laddr, 0, sizeof(laddr));
        memset(&raddr, 0, sizeof(raddr));
        memset(key, 0, sizeof(key));
        cf = cd = lf = ld = rf = rd = wf = wd = nk = false;

        while ((ch = getopt(ac, av, "a:cCd:k:lLrRwW")) != EOF) {
                switch (ch) {
                case 'a':       /* remote device address */
                        if (!bt_aton(optarg, &raddr)) {
                                he = bt_gethostbyname(optarg);
                                if (he == NULL)
                                        errx(EXIT_FAILURE, "%s: %s",
                                            optarg, hstrerror(h_errno));

                                bdaddr_copy(&raddr, (bdaddr_t *)he->h_addr);
                        }
                        break;

                case 'c':       /* clear from file */
                        cf = true;
                        break;

                case 'C':       /* clear from device */
                        cd = true;
                        break;

                case 'd':       /* local device address */
                        if (!bt_devaddr(optarg, &laddr)
                            && !bt_aton(optarg, &laddr)) {
                                he = bt_gethostbyname(optarg);
                                if (he == NULL)
                                        errx(EXIT_FAILURE, "%s: %s",
                                            optarg, hstrerror(h_errno));

                                bdaddr_copy(&laddr, (bdaddr_t *)he->h_addr);
                        }
                        break;

                case 'k':       /* new link key */
                        if (!scan_key(optarg))
                                errx(EXIT_FAILURE, "invalid key '%s'", optarg);

                        nk = true;
                        break;

                case 'l':       /* list from file */
                        lf = true;
                        break;

                case 'L':       /* list from device */
                        ld = true;
                        break;

                case 'r':       /* read from file */
                        rf = true;
                        break;

                case 'R':       /* read from device */
                        rd = true;
                        break;

                case 'w':       /* write to file */
                        wf = true;
                        break;

                case 'W':       /* write to device */
                        wd = true;
                        break;

                default:
                        usage();
                }
        }

        ac -= optind;
        av += optind;

        /*
         * validate options
         */
        if ((lf || ld) && (rf || rd || wf || wd || cf || cd || nk))
                errx(EXIT_FAILURE, "list is exclusive of other options");

        if (((rf && rd) || (rf && nk) || (rd && nk)) && (wf || wd))
                errx(EXIT_FAILURE, "too many key sources");

        if (((bdaddr_any(&laddr) || bdaddr_any(&raddr)) && !(lf || ld))
            || ((lf || ld) && (bdaddr_any(&laddr) || !bdaddr_any(&raddr)))
            || ac > 0)
                usage();

        /*
         * do what we gotta do and be done
         */
        if (!bdaddr_any(&laddr))
                print_addr("device", &laddr);

        if (!bdaddr_any(&raddr))
                print_addr("bdaddr", &raddr);

        if (lf && !list_file())
                err(EXIT_FAILURE, "list file");

        if (ld && !list_device())
                err(EXIT_FAILURE, "list device");

        if (nk)
                print_key("new key", key);

        if (rf) {
                if (!read_file())
                        err(EXIT_FAILURE, "file key");

                print_key("file key", key);
        }

        if (rd) {
                if (!read_device())
                        err(EXIT_FAILURE, "device key");

                print_key("device key", key);
        }

        if (wf || wd || cf || cd)
                printf("\n");

        if (wf) {
                if (!write_file())
                        err(EXIT_FAILURE, "write to file");

                printf("written to file\n");
        }

        if (wd) {
                if (!write_device())
                        err(EXIT_FAILURE, "write to device");

                printf("written to device\n");
        }

        if (cf) {
                if (!clear_file())
                        err(EXIT_FAILURE, "clear from file");

                printf("cleared from file\n");
        }

        if (cd) {
                if (!clear_device())
                        err(EXIT_FAILURE, "clear from device");

                printf("cleared from device\n");
        }

        exit(EXIT_SUCCESS);
}

static void
usage(void)
{

        fprintf(stderr,
                "Usage: %s [-cCrRwW] [-k key] -a address -d device\n"
                "       %s -lL -d device\n"
                "\n", getprogname(), getprogname());

        fprintf(stderr,
                "Where:\n"
                "\t-a address  remote device address\n"
                "\t-c          clear from file\n"
                "\t-C          clear from device\n"
                "\t-d device   local device address\n"
                "\t-k key      user specified link_key\n"
                "\t-l          list file keys\n"
                "\t-L          list device keys\n"
                "\t-r          read from file\n"
                "\t-R          read from device\n"
                "\t-w          write to file\n"
                "\t-W          write to device\n"
                "\n");

        exit(EXIT_FAILURE);
}

static bool
scan_key(const char *arg)
{
        static const char digits[] = "0123456789abcdef";
        const char *p;
        int i, j;

        memset(key, 0, sizeof(key));

        for (i = 0 ; i < HCI_KEY_SIZE ; i++) {
                for (j = 0 ; j < 2 ; j++) {
                        if (*arg == '\0')
                                return true;

                        for (p = digits ;
                            *p != tolower((unsigned char)*arg) ;
                            p++)
                                if (*p == '\0')
                                        return false;

                        arg++;
                        key[i] = (key[i] << 4) + (p - digits);
                }
        }

        if (*arg != '\0')
                return false;

        return true;
}

void
print_key(const char *type, const uint8_t *src)
{
        int i;

        printf("%10s: ", type);
        for (i = 0 ; i < HCI_KEY_SIZE ; i++)
                printf("%2.2x", src[i]);

        printf("\n");
}


void
print_addr(const char *type, const bdaddr_t *addr)
{
        char name[HCI_DEVNAME_SIZE];
        struct hostent *he;

        printf("%10s: %s", type, bt_ntoa(addr, NULL));

        if (bt_devname(name, addr))
                printf(" (%s)", name);
        else if ((he = bt_gethostbyaddr((const char *)addr,
            sizeof(bdaddr_t), AF_BLUETOOTH)) != NULL)
                printf(" (%s)", he->h_name);

        printf("\n");
}