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1 /*      $NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 plunky Exp $        */
2
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5  *
6  * Copyright (c) 2008 Iain Hibbert
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29
30 /* $FreeBSD$ */
31
32 #include <sys/cdefs.h>
33 __COPYRIGHT("@(#) Copyright (c) 2008 Iain Hibbert. All rights reserved.");
34 __RCSID("$NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 plunky Exp $");
35
36 #include <sys/wait.h>
37
38 #define L2CAP_SOCKET_CHECKED
39 #include <bluetooth.h>
40 #include <err.h>
41 #include <fcntl.h>
42 #include <paths.h>
43 #include <sdp.h>
44 #include <stdio.h>
45 #include <signal.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 #include "btpand.h"
51
52 /* global variables */
53 const char *    control_path;           /* -c <path> */
54 const char *    interface_name;         /* -i <ifname> */
55 const char *    service_name;           /* -s <service> */
56 uint16_t        service_class;
57
58 bdaddr_t        local_bdaddr;           /* -d <addr> */
59 bdaddr_t        remote_bdaddr;          /* -a <addr> */
60 uint16_t        l2cap_psm;              /* -p <psm> */
61 int             l2cap_mode;             /* -m <mode> */
62
63 int             server_limit;           /* -n <limit> */
64
65 static const struct {
66         const char *    name;
67         uint16_t        class;
68         const char *    desc;
69 } services[] = {
70         { "PANU", SDP_SERVICE_CLASS_PANU, "Personal Area Networking User" },
71         { "NAP",  SDP_SERVICE_CLASS_NAP,  "Network Access Point"                  },
72         { "GN",   SDP_SERVICE_CLASS_GN,   "Group Network"                 },
73 };
74
75 static void main_exit(int);
76 static void main_detach(void);
77 static void usage(void);
78
79 int
80 main(int argc, char *argv[])
81 {
82         unsigned long   ul;
83         char *          ep;
84         int             ch, status;
85
86         while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) {
87                 switch (ch) {
88                 case 'a': /* remote address */
89                         if (!bt_aton(optarg, &remote_bdaddr)) {
90                                 struct hostent  *he;
91
92                                 if ((he = bt_gethostbyname(optarg)) == NULL)
93                                         errx(EXIT_FAILURE, "%s: %s",
94                                             optarg, hstrerror(h_errno));
95
96                                 bdaddr_copy(&remote_bdaddr,
97                                         (bdaddr_t *)he->h_addr);
98                         }
99
100                         break;
101
102                 case 'c': /* control socket path */
103                         control_path = optarg;
104                         break;
105
106                 case 'd': /* local address */
107                         if (!bt_devaddr(optarg, &local_bdaddr)) {
108                                 struct hostent  *he;
109
110                                 if ((he = bt_gethostbyname(optarg)) == NULL)
111                                         errx(EXIT_FAILURE, "%s: %s",
112                                             optarg, hstrerror(h_errno));
113
114                                 bdaddr_copy(&local_bdaddr,
115                                         (bdaddr_t *)he->h_addr);
116                         }
117                         break;
118
119                 case 'i': /* tap interface name */
120                         if (strchr(optarg, '/') == NULL) {
121                                 asprintf(&ep, "/dev/%s", optarg);
122                                 interface_name = ep;
123                         } else
124                                 interface_name = optarg;
125                         break;
126
127                 case 'l': /* limit server sessions */
128                         ul = strtoul(optarg, &ep, 10);
129                         if (*optarg == '\0' || *ep != '\0' || ul == 0)
130                                 errx(EXIT_FAILURE, "%s: invalid session limit",
131                                         optarg);
132
133                         server_limit = ul;
134                         break;
135
136                 case 'm': /* link mode */
137                         warnx("Setting link mode is not yet supported");
138                         break;
139
140                 case 'p': /* protocol/service multiplexer */
141                         ul = strtoul(optarg, &ep, 0);
142                         if (*optarg == '\0' || *ep != '\0'
143                             || ul > 0xffff || L2CAP_PSM_INVALID(ul))
144                                 errx(EXIT_FAILURE, "%s: invalid PSM", optarg);
145
146                         l2cap_psm = ul;
147                         break;
148
149                 case 's': /* service */
150                 case 'S': /* service (no SDP) */
151                         for (ul = 0; strcasecmp(optarg, services[ul].name); ul++) {
152                                 if (ul == __arraycount(services))
153                                         errx(EXIT_FAILURE, "%s: unknown service", optarg);
154                         }
155
156                         if (ch == 's')
157                                 service_name = services[ul].name;
158
159                         service_class = services[ul].class;
160                         break;
161
162                 default:
163                         usage();
164                         /* NOTREACHED */
165                 }
166         }
167
168         argc -= optind;
169         argv += optind;
170
171         /* validate options */
172         if (bdaddr_any(&local_bdaddr) || service_class == 0)
173                 usage();
174
175         if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 ||
176             control_path != NULL || (service_name != NULL && l2cap_psm != 0)))
177                 usage();
178
179         /* default options */
180         if (interface_name == NULL)
181                 interface_name = "/dev/tap";
182
183         if (l2cap_psm == 0)
184                 l2cap_psm = L2CAP_PSM_BNEP;
185
186         if (bdaddr_any(&remote_bdaddr) && server_limit == 0) {
187                 if (service_class == SDP_SERVICE_CLASS_PANU)
188                         server_limit = 1;
189                 else
190                         server_limit = 7;
191         }
192
193 #ifdef L2CAP_LM_MASTER
194         if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU)
195                 l2cap_mode |= L2CAP_LM_MASTER;
196 #endif
197
198         /*
199          * fork() now so that the setup can be done in the child process
200          * (as kqueue is not inherited) but block in the parent until the
201          * setup is finished so we can return an error if necessary.
202          */
203         switch(fork()) {
204         case -1: /* bad */
205                 err(EXIT_FAILURE, "fork() failed");
206
207         case 0: /* child */
208                 signal(SIGPIPE, SIG_IGN);
209
210                 openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON);
211
212                 channel_init();
213                 server_init();
214                 event_init();
215                 client_init();
216                 tap_init();
217
218                 main_detach();
219
220                 event_dispatch();
221                 break;
222
223         default: /* parent */
224                 signal(SIGUSR1, main_exit);
225                 wait(&status);
226
227                 if (WIFEXITED(status))
228                         exit(WEXITSTATUS(status));
229
230                 break;
231         }
232
233         err(EXIT_FAILURE, "exiting");
234 }
235
236 static void
237 main_exit(int s)
238 {
239
240         /* child is all grown up */
241         _exit(EXIT_SUCCESS);
242 }
243
244 static void
245 main_detach(void)
246 {
247         int fd;
248
249         if (kill(getppid(), SIGUSR1) == -1)
250                 log_err("Could not signal main process: %m");
251
252         if (setsid() == -1)
253                 log_err("setsid() failed");
254
255         fd = open(_PATH_DEVNULL, O_RDWR, 0);
256         if (fd == -1) {
257                 log_err("Could not open %s", _PATH_DEVNULL);
258         } else {
259                 (void)dup2(fd, STDIN_FILENO);
260                 (void)dup2(fd, STDOUT_FILENO);
261                 (void)dup2(fd, STDERR_FILENO);
262                 close(fd);
263         }
264 }
265
266 static void
267 usage(void)
268 {
269         const char *p = getprogname();
270         int n = strlen(p);
271
272         fprintf(stderr,
273             "usage: %s [-i ifname] [-m mode] -a address -d device\n"
274             "       %*s {-s service | -S service [-p psm]}\n"
275             "       %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n"
276             "       %*s {-s service | -S service}\n"
277             "\n"
278             "Where:\n"
279             "\t-a address  remote bluetooth device\n"
280             "\t-c path     SDP server socket\n"
281             "\t-d device   local bluetooth device\n"
282             "\t-i ifname   tap interface\n"
283             "\t-l limit    limit server sessions\n"
284             "\t-m mode     L2CAP link mode (NOT YET SUPPORTED)\n"
285             "\t-p psm      L2CAP PSM\n"
286             "\t-S service  service name (no SDP)\n"
287             "\t-s service  service name\n"
288             "\n"
289             "Known services:\n"
290             "", p, n, "", p, n, "");
291
292         for (n = 0; n < __arraycount(services); n++)
293                 fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc);
294
295         exit(EXIT_FAILURE);
296 }