/*      $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");
}

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