/*
 * bthidd.c
 */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2006 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: bthidd.c,v 1.8 2006/09/07 21:06:53 max Exp $
 */

#include <sys/time.h>
#include <sys/queue.h>
#include <assert.h>
#define L2CAP_SOCKET_CHECKED
#include <bluetooth.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <usbhid.h>
#include "bthid_config.h"
#include "bthidd.h"

static int32_t  write_pid_file  (char const *file);
static int32_t  remove_pid_file (char const *file);
static int32_t  elapsed         (int32_t tval);
static void     sighandler      (int32_t s);
static void     usage           (void);

/*
 * bthidd
 */

static int32_t  done = 0; /* are we done? */

int32_t
main(int32_t argc, char *argv[])
{
        struct bthid_server      srv;
        struct sigaction         sa;
        char const              *pid_file = BTHIDD_PIDFILE;
        char                    *ep;
        int32_t                  opt, detach, tval, uinput;

        memset(&srv, 0, sizeof(srv));
        memset(&srv.bdaddr, 0, sizeof(srv.bdaddr));
        detach = 1;
        tval = 10; /* sec */
        uinput = 0;

        while ((opt = getopt(argc, argv, "a:c:dH:hp:t:u")) != -1) {
                switch (opt) {
                case 'a': /* BDADDR */
                        if (!bt_aton(optarg, &srv.bdaddr)) {
                                struct hostent  *he;

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

                                memcpy(&srv.bdaddr, he->h_addr, sizeof(srv.bdaddr));
                        }
                        break;
                        
                case 'c': /* config file */
                        config_file = optarg;
                        break;

                case 'd': /* do not detach */
                        detach = 0;
                        break;

                case 'H': /* hids file */
                        hids_file = optarg;
                        break;

                case 'p': /* pid file */
                        pid_file = optarg;
                        break;

                case 't': /* rescan interval */
                        tval = strtol(optarg, (char **) &ep, 10);
                        if (*ep != '\0' || tval <= 0)
                                usage();
                        break;

                case 'u': /* enable evdev support */
                        uinput = 1;
                        break;

                case 'h':
                default:
                        usage();
                        /* NOT REACHED */
                }
        }

        openlog(BTHIDD_IDENT, LOG_PID|LOG_PERROR|LOG_NDELAY, LOG_USER);

        /* Become daemon if required */
        if (detach && daemon(0, 0) < 0) {
                syslog(LOG_CRIT, "Could not become daemon. %s (%d)",
                        strerror(errno), errno);
                exit(1);
        }

        /* Install signal handler */
        memset(&sa, 0, sizeof(sa));
        sa.sa_handler = sighandler;

        if (sigaction(SIGTERM, &sa, NULL) < 0 ||
            sigaction(SIGHUP, &sa, NULL) < 0 ||
            sigaction(SIGINT, &sa, NULL) < 0) {
                syslog(LOG_CRIT, "Could not install signal handlers. %s (%d)",
                        strerror(errno), errno);
                exit(1);
        }

        sa.sa_handler = SIG_IGN;
        if (sigaction(SIGPIPE, &sa, NULL) < 0) {
                syslog(LOG_CRIT, "Could not install signal handlers. %s (%d)",
                        strerror(errno), errno);
                exit(1);
        }

        sa.sa_handler = SIG_IGN;
        sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT;
        if (sigaction(SIGCHLD, &sa, NULL) < 0) {
                syslog(LOG_CRIT, "Could not install signal handlers. %s (%d)",
                        strerror(errno), errno);
                exit(1);
        }

        if (read_config_file() < 0 || read_hids_file() < 0 ||
            server_init(&srv) < 0 || write_pid_file(pid_file) < 0)
                exit(1);

        srv.uinput = uinput;

        for (done = 0; !done; ) {
                if (elapsed(tval))
                        client_rescan(&srv);

                if (server_do(&srv) < 0)
                        break;
        }

        server_shutdown(&srv);
        remove_pid_file(pid_file);
        clean_config();
        closelog();

        return (0);
}

/*
 * Write pid file
 */

static int32_t
write_pid_file(char const *file)
{
        FILE    *pid;

        assert(file != NULL);

        if ((pid = fopen(file, "w")) == NULL) {
                syslog(LOG_ERR, "Could not open file %s. %s (%d)",
                        file, strerror(errno), errno);
                return (-1);
        }

        fprintf(pid, "%d", getpid());
        fclose(pid);

        return (0);
}

/*
 * Remote pid file
 */

static int32_t
remove_pid_file(char const *file)
{
        assert(file != NULL);

        if (unlink(file) < 0) {
                syslog(LOG_ERR, "Could not unlink file %s. %s (%d)",
                        file, strerror(errno), errno);
                return (-1);
        }

        return (0);
}

/*
 * Returns true if desired time interval has elapsed
 */

static int32_t
elapsed(int32_t tval)
{
        static struct timeval   last = { 0, 0 };
        struct timeval          now;

        gettimeofday(&now, NULL);

        if (now.tv_sec - last.tv_sec >= tval) {
                last = now;
                return (1);
        }

        return (0);
}

/*
 * Signal handler
 */

static void
sighandler(int32_t s)
{
        syslog(LOG_NOTICE, "Got signal %d, total number of signals %d",
                s, ++ done);
}

/*
 * Display usage and exit
 */

static void
usage(void)
{
        fprintf(stderr,
"Usage: %s [options]\n" \
"Where options are:\n" \
"       -a address      specify address to listen on (default ANY)\n" \
"       -c file         specify config file name\n" \
"       -d              run in foreground\n" \
"       -H file         specify known HIDs file name\n" \
"       -h              display this message\n" \
"       -p file         specify PID file name\n" \
"       -t tval         specify client rescan interval (sec)\n" \
"       -u              enable evdev protocol support\n" \
"", BTHIDD_IDENT);
        exit(255);
}