/*-
 * l2control.c
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
 * 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.
 *
 * $Id: l2control.c,v 1.6 2003/09/05 00:38:25 max Exp $
 */

#include <assert.h>
#define L2CAP_SOCKET_CHECKED
#include <bluetooth.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "l2control.h"

/* Prototypes */
static int                    do_l2cap_command    (bdaddr_p, int, char **);
static struct l2cap_command * find_l2cap_command  (char const *, 
                                                   struct l2cap_command *);
static void                   print_l2cap_command (struct l2cap_command *);
static void                   usage               (void);

/* Main */

int     numeric_bdaddr = 0;

int
main(int argc, char *argv[])
{
        int             n;
        bdaddr_t        bdaddr;

        memset(&bdaddr, 0, sizeof(bdaddr));

        /* Process command line arguments */
        while ((n = getopt(argc, argv, "a:nh")) != -1) {
                switch (n) {
                case 'a':
                        if (!bt_aton(optarg, &bdaddr)) {
                                struct hostent  *he = NULL;

                                if ((he = bt_gethostbyname(optarg)) == NULL)
                                        errx(1, "%s: %s", optarg, hstrerror(h_errno));

                                memcpy(&bdaddr, he->h_addr, sizeof(bdaddr));
                        }
                        break;

                case 'n':
                        numeric_bdaddr = 1;
                        break;

                case 'h':
                default:
                        usage();
                        break;
                }
        }

        argc -= optind;
        argv += optind;

        if (*argv == NULL)
                usage();

        return (do_l2cap_command(&bdaddr, argc, argv));
} /* main */

/* Execute commands */
static int
do_l2cap_command(bdaddr_p bdaddr, int argc, char **argv)
{
        char                    *cmd = argv[0];
        struct l2cap_command    *c = NULL;
        struct sockaddr_l2cap    sa;
        int                      s, e, help;

        help = 0;
        if (strcasecmp(cmd, "help") == 0) {
                argc --;
                argv ++;

                if (argc <= 0) {
                        fprintf(stdout, "Supported commands:\n");
                        print_l2cap_command(l2cap_commands);
                        fprintf(stdout, "\nFor more information use " \
                                "'help command'\n");

                        return (OK);
                }

                help = 1;
                cmd = argv[0];
        }

        c = find_l2cap_command(cmd, l2cap_commands);
        if (c == NULL) {
                fprintf(stdout, "Unknown command: \"%s\"\n", cmd);
                return (ERROR);
        }

        if (!help) {
                if (memcmp(bdaddr, NG_HCI_BDADDR_ANY, sizeof(*bdaddr)) == 0)
                        usage();

                memset(&sa, 0, sizeof(sa));
                sa.l2cap_len = sizeof(sa);
                sa.l2cap_family = AF_BLUETOOTH;
                memcpy(&sa.l2cap_bdaddr, bdaddr, sizeof(sa.l2cap_bdaddr));

                s = socket(PF_BLUETOOTH, SOCK_RAW, BLUETOOTH_PROTO_L2CAP);
                if (s < 0)
                        err(1, "Could not create socket");
        
                if (bind(s, (struct sockaddr *) &sa, sizeof(sa)) < 0)
                        err(2,
"Could not bind socket, bdaddr=%s", bt_ntoa(&sa.l2cap_bdaddr, NULL));

                e = 0x0ffff;
                if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &e, sizeof(e)) < 0)
                        err(3, "Could not setsockopt(RCVBUF, %d)", e);

                e = (c->handler)(s, -- argc, ++ argv);

                close(s);
        } else
                e = USAGE;

        switch (e) {
        case OK:
        case FAILED:
                break;

        case ERROR:
                fprintf(stdout, "Could not execute command \"%s\". %s\n",
                        cmd, strerror(errno));
                break;

        case USAGE:
                fprintf(stdout, "Usage: %s\n%s\n", c->command, c->description);
                break;

        default: assert(0); break;
        }

        return (e);
} /* do_l2cap_command */

/* Try to find command in specified category */
static struct l2cap_command *
find_l2cap_command(char const *command, struct l2cap_command *category)
{
        struct l2cap_command    *c = NULL;

        for (c = category; c->command != NULL; c++) {
                char    *c_end = strchr(c->command, ' ');

                if (c_end != NULL) {
                        int     len = c_end - c->command;

                        if (strncasecmp(command, c->command, len) == 0)
                                return (c);
                } else if (strcasecmp(command, c->command) == 0)
                                return (c);
        }

        return (NULL);
} /* find_l2cap_command */

/* Print commands in specified category */
static void
print_l2cap_command(struct l2cap_command *category)
{
        struct l2cap_command    *c = NULL;

        for (c = category; c->command != NULL; c++)
                fprintf(stdout, "\t%s\n", c->command);
} /* print_l2cap_command */

/* Usage */
static void
usage(void)
{
        fprintf(stderr, "Usage: l2control [-hn] -a local cmd [params ..]\n");
        fprintf(stderr, "Where:\n");
        fprintf(stderr, "  -a local   Specify local device to connect to\n");
        fprintf(stderr, "  -h         Display this message\n");
        fprintf(stderr, "  -n         Show addresses as numbers\n");
        fprintf(stderr, "  cmd        Supported command " \
                "(see l2control help)\n");
        fprintf(stderr, "  params     Optional command parameters\n");
        exit(255);
} /* usage */