/*      $NetBSD: btpand.c,v 1.9 2024/06/04 06:24:58 plunky Exp $        */

/*-
* Copyright (c) 2008-2009 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.
*
* 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) 2008-2009 Iain Hibbert. All rights reserved.");
__RCSID("$NetBSD: btpand.c,v 1.9 2024/06/04 06:24:58 plunky Exp $");

#include <sys/wait.h>

#include <bluetooth.h>
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <sdp.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "btpand.h"

/* global variables */
const char *    control_path;           /* -c <path> */
const char *    interface_name;         /* -i <ifname> */
const char *    service_type;           /* -s <service> */
uint16_t        service_class;
const char *    service_name;
const char *    service_desc;

bdaddr_t        local_bdaddr;           /* -d <addr> */
bdaddr_t        remote_bdaddr;          /* -a <addr> */
uint16_t        l2cap_psm;              /* -p <psm> */
int             l2cap_mode;             /* -m <mode> */
int             server_limit;           /* -n <limit> */

static const struct {
       const char *    type;
       uint16_t        class;
       const char *    name;
       const char *    desc;
} services[] = {
       { "PANU", SDP_SERVICE_CLASS_PANU,
         "Personal Ad-hoc User Service",
         "Personal Ad-hoc User Service"
       },
       { "NAP",  SDP_SERVICE_CLASS_NAP,
         "Network Access Point",
         "Personal Ad-hoc Network Service"
       },
       { "GN",   SDP_SERVICE_CLASS_GN,
         "Group Ad-hoc Network",
         "Personal Group Ad-hoc Network Service"
       },
};

__dead static void main_exit(int);
static void main_detach(void);
__dead static void usage(void);

int
main(int argc, char *argv[])
{
       unsigned long   ul;
       char *          ep;
       int             ch, status;

       while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) {
               switch (ch) {
               case 'a': /* remote address */
                       if (!bt_aton(optarg, &remote_bdaddr)) {
                               struct hostent  *he;

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

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

                       break;

               case 'c': /* control socket path */
                       control_path = optarg;
                       break;

               case 'd': /* local address */
                       if (!bt_devaddr(optarg, &local_bdaddr))
                               err(EXIT_FAILURE, "%s", optarg);

                       break;

               case 'i': /* tap interface name */
                       if (strchr(optarg, '/') == NULL) {
                               asprintf(&ep, "/dev/%s", optarg);
                               interface_name = ep;
                       } else {
                               interface_name = optarg;
                       }

                       break;

               case 'l': /* limit server sessions */
                       ul = strtoul(optarg, &ep, 10);
                       if (*optarg == '\0' || *ep != '\0' || ul == 0)
                               errx(EXIT_FAILURE, "%s: invalid session limit", optarg);

                       server_limit = ul;
                       break;

               case 'm': /* link mode */
                       if (strcasecmp(optarg, "auth") == 0)
                               l2cap_mode = L2CAP_LM_AUTH;
                       else if (strcasecmp(optarg, "encrypt") == 0)
                               l2cap_mode = L2CAP_LM_ENCRYPT;
                       else if (strcasecmp(optarg, "secure") == 0)
                               l2cap_mode = L2CAP_LM_SECURE;
                       else if (strcasecmp(optarg, "none"))
                               errx(EXIT_FAILURE, "%s: unknown mode", optarg);

                       break;

               case 'p': /* protocol/service multiplexer */
                       ul = strtoul(optarg, &ep, 0);
                       if (*optarg == '\0' || *ep != '\0'
                           || ul > 0xffff || L2CAP_PSM_INVALID(ul))
                               errx(EXIT_FAILURE, "%s: invalid PSM", optarg);

                       l2cap_psm = (uint16_t)ul;
                       break;

               case 's': /* service */
               case 'S': /* service (no SDP) */
                       for (ul = 0; ul < __arraycount(services); ul++) {
                               if (strcasecmp(optarg, services[ul].type) == 0)
                                       break;
                       }

                       if (ul == __arraycount(services))
                               errx(EXIT_FAILURE, "%s: unknown service", optarg);

                       if (ch == 's') {
                               service_type = services[ul].type;
                               service_name = services[ul].name;
                               service_desc = services[ul].desc;
                       }

                       service_class = services[ul].class;
                       break;

               default:
                       usage();
                       /* NOTREACHED */
               }
       }

       argc -= optind;
       argv += optind;

       /* validate options */
       if (bdaddr_any(&local_bdaddr) || service_class == 0)
               usage();

       if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 ||
           control_path != 0 || (service_type != NULL && l2cap_psm != 0)))
               usage();

       /* default options */
       if (interface_name == NULL)
               interface_name = "/dev/tap";

       if (l2cap_psm == 0)
               l2cap_psm = L2CAP_PSM_BNEP;

       if (bdaddr_any(&remote_bdaddr) && server_limit == 0) {
               if (service_class == SDP_SERVICE_CLASS_PANU)
                       server_limit = 1;
               else
                       server_limit = 7;
       }

#ifdef L2CAP_LM_MASTER
       if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU)
               l2cap_mode |= L2CAP_LM_MASTER;
#endif

       /*
        * fork() now so that the setup can be done in the child process
        * (as kqueue is not inherited) but block in the parent until the
        * setup is finished so we can return an error if necessary.
        */
       switch(fork()) {
       case -1: /* bad */
               err(EXIT_FAILURE, "fork() failed");
               /*NOTREACHED*/

       case 0: /* child */
               openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON);

               channel_init();
               event_init();
               server_init();
               client_init();
               tap_init();

               main_detach();

               event_dispatch();
               break;

       default: /* parent */
               signal(SIGUSR1, main_exit);
               wait(&status);

               if (WIFEXITED(status))
                       exit(WEXITSTATUS(status));

               break;
       }

       err(EXIT_FAILURE, "exiting");
}

static void
main_exit(int s)
{

       /* child is all grown up */
       _exit(EXIT_SUCCESS);
}

static void
main_detach(void)
{
       int fd;

       if (kill(getppid(), SIGUSR1) == -1)
               log_err("Could not signal main process: %m");

       if (setsid() == -1)
               log_err("setsid() failed");

       fd = open(_PATH_DEVNULL, O_RDWR, 0);
       if (fd == -1) {
               log_err("Could not open %s", _PATH_DEVNULL);
       } else {
               (void)dup2(fd, STDIN_FILENO);
               (void)dup2(fd, STDOUT_FILENO);
               (void)dup2(fd, STDERR_FILENO);
               close(fd);
       }
}

static void
usage(void)
{
       const char *p = getprogname();
       size_t n = strlen(p);

       fprintf(stderr,
           "usage: %s [-i ifname] [-m mode] -a address -d device\n"
           "       %*s {-s service | -S service [-p psm]}\n"
           "       %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n"
           "       %*s {-s service | -S service}\n"
           "\n"
           "Where:\n"
           "\t-a address  remote bluetooth device\n"
           "\t-c path     SDP server socket\n"
           "\t-d device   local bluetooth device\n"
           "\t-i ifname   tap interface\n"
           "\t-l limit    limit server sessions\n"
           "\t-m mode     L2CAP link mode\n"
           "\t-p psm      L2CAP PSM\n"
           "\t-S service  service name (no SDP)\n"
           "\t-s service  service name\n"
           "\n"
           "Known services:\n"
           "", p, (int)n, "", p, (int)n, "");

       for (n = 0; n < __arraycount(services); n++)
               fprintf(stderr, "\t%s\t%s\n", services[n].type, services[n].name);

       exit(EXIT_FAILURE);
}

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