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[FreeBSD/stable/10.git] / usr.sbin / bluetooth / btpand / btpand.c
1 /*      $NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 plunky Exp $        */
2
3 /*-
4  * Copyright (c) 2008 Iain Hibbert
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27
28 /* $FreeBSD$ */
29
30 #include <sys/cdefs.h>
31 __COPYRIGHT("@(#) Copyright (c) 2008 Iain Hibbert. All rights reserved.");
32 __RCSID("$NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
33
34 #include <sys/wait.h>
35
36 #include <bluetooth.h>
37 #include <err.h>
38 #include <fcntl.h>
39 #include <paths.h>
40 #include <sdp.h>
41 #include <stdio.h>
42 #include <signal.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46
47 #include "btpand.h"
48
49 /* global variables */
50 const char *    control_path;           /* -c <path> */
51 const char *    interface_name;         /* -i <ifname> */
52 const char *    service_name;           /* -s <service> */
53 uint16_t        service_class;
54
55 bdaddr_t        local_bdaddr;           /* -d <addr> */
56 bdaddr_t        remote_bdaddr;          /* -a <addr> */
57 uint16_t        l2cap_psm;              /* -p <psm> */
58 int             l2cap_mode;             /* -m <mode> */
59
60 int             server_limit;           /* -n <limit> */
61
62 static const struct {
63         const char *    name;
64         uint16_t        class;
65         const char *    desc;
66 } services[] = {
67         { "PANU", SDP_SERVICE_CLASS_PANU, "Personal Area Networking User" },
68         { "NAP",  SDP_SERVICE_CLASS_NAP,  "Network Access Point"                  },
69         { "GN",   SDP_SERVICE_CLASS_GN,   "Group Network"                 },
70 };
71
72 static void main_exit(int);
73 static void main_detach(void);
74 static void usage(void);
75
76 int
77 main(int argc, char *argv[])
78 {
79         unsigned long   ul;
80         char *          ep;
81         int             ch, status;
82
83         while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) {
84                 switch (ch) {
85                 case 'a': /* remote address */
86                         if (!bt_aton(optarg, &remote_bdaddr)) {
87                                 struct hostent  *he;
88
89                                 if ((he = bt_gethostbyname(optarg)) == NULL)
90                                         errx(EXIT_FAILURE, "%s: %s",
91                                             optarg, hstrerror(h_errno));
92
93                                 bdaddr_copy(&remote_bdaddr,
94                                         (bdaddr_t *)he->h_addr);
95                         }
96
97                         break;
98
99                 case 'c': /* control socket path */
100                         control_path = optarg;
101                         break;
102
103                 case 'd': /* local address */
104                         if (!bt_devaddr(optarg, &local_bdaddr)) {
105                                 struct hostent  *he;
106
107                                 if ((he = bt_gethostbyname(optarg)) == NULL)
108                                         errx(EXIT_FAILURE, "%s: %s",
109                                             optarg, hstrerror(h_errno));
110
111                                 bdaddr_copy(&local_bdaddr,
112                                         (bdaddr_t *)he->h_addr);
113                         }
114                         break;
115
116                 case 'i': /* tap interface name */
117                         if (strchr(optarg, '/') == NULL) {
118                                 asprintf(&ep, "/dev/%s", optarg);
119                                 interface_name = ep;
120                         } else
121                                 interface_name = optarg;
122                         break;
123
124                 case 'l': /* limit server sessions */
125                         ul = strtoul(optarg, &ep, 10);
126                         if (*optarg == '\0' || *ep != '\0' || ul == 0)
127                                 errx(EXIT_FAILURE, "%s: invalid session limit",
128                                         optarg);
129
130                         server_limit = ul;
131                         break;
132
133                 case 'm': /* link mode */
134                         warnx("Setting link mode is not yet supported");
135                         break;
136
137                 case 'p': /* protocol/service multiplexer */
138                         ul = strtoul(optarg, &ep, 0);
139                         if (*optarg == '\0' || *ep != '\0'
140                             || ul > 0xffff || L2CAP_PSM_INVALID(ul))
141                                 errx(EXIT_FAILURE, "%s: invalid PSM", optarg);
142
143                         l2cap_psm = ul;
144                         break;
145
146                 case 's': /* service */
147                 case 'S': /* service (no SDP) */
148                         for (ul = 0; strcasecmp(optarg, services[ul].name); ul++) {
149                                 if (ul == __arraycount(services))
150                                         errx(EXIT_FAILURE, "%s: unknown service", optarg);
151                         }
152
153                         if (ch == 's')
154                                 service_name = services[ul].name;
155
156                         service_class = services[ul].class;
157                         break;
158
159                 default:
160                         usage();
161                         /* NOTREACHED */
162                 }
163         }
164
165         argc -= optind;
166         argv += optind;
167
168         /* validate options */
169         if (bdaddr_any(&local_bdaddr) || service_class == 0)
170                 usage();
171
172         if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 ||
173             control_path != 0 || (service_name != NULL && l2cap_psm != 0)))
174                 usage();
175
176         /* default options */
177         if (interface_name == NULL)
178                 interface_name = "/dev/tap";
179
180         if (l2cap_psm == 0)
181                 l2cap_psm = L2CAP_PSM_BNEP;
182
183         if (bdaddr_any(&remote_bdaddr) && server_limit == 0) {
184                 if (service_class == SDP_SERVICE_CLASS_PANU)
185                         server_limit = 1;
186                 else
187                         server_limit = 7;
188         }
189
190 #ifdef L2CAP_LM_MASTER
191         if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU)
192                 l2cap_mode |= L2CAP_LM_MASTER;
193 #endif
194
195         /*
196          * fork() now so that the setup can be done in the child process
197          * (as kqueue is not inherited) but block in the parent until the
198          * setup is finished so we can return an error if necessary.
199          */
200         switch(fork()) {
201         case -1: /* bad */
202                 err(EXIT_FAILURE, "fork() failed");
203
204         case 0: /* child */
205                 signal(SIGPIPE, SIG_IGN);
206
207                 openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON);
208
209                 channel_init();
210                 server_init();
211                 event_init();
212                 client_init();
213                 tap_init();
214
215                 main_detach();
216
217                 event_dispatch();
218                 break;
219
220         default: /* parent */
221                 signal(SIGUSR1, main_exit);
222                 wait(&status);
223
224                 if (WIFEXITED(status))
225                         exit(WEXITSTATUS(status));
226
227                 break;
228         }
229
230         err(EXIT_FAILURE, "exiting");
231 }
232
233 static void
234 main_exit(int s)
235 {
236
237         /* child is all grown up */
238         _exit(EXIT_SUCCESS);
239 }
240
241 static void
242 main_detach(void)
243 {
244         int fd;
245
246         if (kill(getppid(), SIGUSR1) == -1)
247                 log_err("Could not signal main process: %m");
248
249         if (setsid() == -1)
250                 log_err("setsid() failed");
251
252         fd = open(_PATH_DEVNULL, O_RDWR, 0);
253         if (fd == -1) {
254                 log_err("Could not open %s", _PATH_DEVNULL);
255         } else {
256                 (void)dup2(fd, STDIN_FILENO);
257                 (void)dup2(fd, STDOUT_FILENO);
258                 (void)dup2(fd, STDERR_FILENO);
259                 close(fd);
260         }
261 }
262
263 static void
264 usage(void)
265 {
266         const char *p = getprogname();
267         int n = strlen(p);
268
269         fprintf(stderr,
270             "usage: %s [-i ifname] [-m mode] -a address -d device\n"
271             "       %*s {-s service | -S service [-p psm]}\n"
272             "       %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n"
273             "       %*s {-s service | -S service}\n"
274             "\n"
275             "Where:\n"
276             "\t-a address  remote bluetooth device\n"
277             "\t-c path     SDP server socket\n"
278             "\t-d device   local bluetooth device\n"
279             "\t-i ifname   tap interface\n"
280             "\t-l limit    limit server sessions\n"
281             "\t-m mode     L2CAP link mode (NOT YET SUPPORTED)\n"
282             "\t-p psm      L2CAP PSM\n"
283             "\t-S service  service name (no SDP)\n"
284             "\t-s service  service name\n"
285             "\n"
286             "Known services:\n"
287             "", p, n, "", p, n, "");
288
289         for (n = 0; n < __arraycount(services); n++)
290                 fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc);
291
292         exit(EXIT_FAILURE);
293 }