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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 #define L2CAP_SOCKET_CHECKED
37 #include <bluetooth.h>
38 #include <err.h>
39 #include <fcntl.h>
40 #include <paths.h>
41 #include <sdp.h>
42 #include <stdio.h>
43 #include <signal.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47
48 #include "btpand.h"
49
50 /* global variables */
51 const char *    control_path;           /* -c <path> */
52 const char *    interface_name;         /* -i <ifname> */
53 const char *    service_name;           /* -s <service> */
54 uint16_t        service_class;
55
56 bdaddr_t        local_bdaddr;           /* -d <addr> */
57 bdaddr_t        remote_bdaddr;          /* -a <addr> */
58 uint16_t        l2cap_psm;              /* -p <psm> */
59 int             l2cap_mode;             /* -m <mode> */
60
61 int             server_limit;           /* -n <limit> */
62
63 static const struct {
64         const char *    name;
65         uint16_t        class;
66         const char *    desc;
67 } services[] = {
68         { "PANU", SDP_SERVICE_CLASS_PANU, "Personal Area Networking User" },
69         { "NAP",  SDP_SERVICE_CLASS_NAP,  "Network Access Point"                  },
70         { "GN",   SDP_SERVICE_CLASS_GN,   "Group Network"                 },
71 };
72
73 static void main_exit(int);
74 static void main_detach(void);
75 static void usage(void);
76
77 int
78 main(int argc, char *argv[])
79 {
80         unsigned long   ul;
81         char *          ep;
82         int             ch, status;
83
84         while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) {
85                 switch (ch) {
86                 case 'a': /* remote address */
87                         if (!bt_aton(optarg, &remote_bdaddr)) {
88                                 struct hostent  *he;
89
90                                 if ((he = bt_gethostbyname(optarg)) == NULL)
91                                         errx(EXIT_FAILURE, "%s: %s",
92                                             optarg, hstrerror(h_errno));
93
94                                 bdaddr_copy(&remote_bdaddr,
95                                         (bdaddr_t *)he->h_addr);
96                         }
97
98                         break;
99
100                 case 'c': /* control socket path */
101                         control_path = optarg;
102                         break;
103
104                 case 'd': /* local address */
105                         if (!bt_devaddr(optarg, &local_bdaddr)) {
106                                 struct hostent  *he;
107
108                                 if ((he = bt_gethostbyname(optarg)) == NULL)
109                                         errx(EXIT_FAILURE, "%s: %s",
110                                             optarg, hstrerror(h_errno));
111
112                                 bdaddr_copy(&local_bdaddr,
113                                         (bdaddr_t *)he->h_addr);
114                         }
115                         break;
116
117                 case 'i': /* tap interface name */
118                         if (strchr(optarg, '/') == NULL) {
119                                 asprintf(&ep, "/dev/%s", optarg);
120                                 interface_name = ep;
121                         } else
122                                 interface_name = optarg;
123                         break;
124
125                 case 'l': /* limit server sessions */
126                         ul = strtoul(optarg, &ep, 10);
127                         if (*optarg == '\0' || *ep != '\0' || ul == 0)
128                                 errx(EXIT_FAILURE, "%s: invalid session limit",
129                                         optarg);
130
131                         server_limit = ul;
132                         break;
133
134                 case 'm': /* link mode */
135                         warnx("Setting link mode is not yet supported");
136                         break;
137
138                 case 'p': /* protocol/service multiplexer */
139                         ul = strtoul(optarg, &ep, 0);
140                         if (*optarg == '\0' || *ep != '\0'
141                             || ul > 0xffff || L2CAP_PSM_INVALID(ul))
142                                 errx(EXIT_FAILURE, "%s: invalid PSM", optarg);
143
144                         l2cap_psm = ul;
145                         break;
146
147                 case 's': /* service */
148                 case 'S': /* service (no SDP) */
149                         for (ul = 0; strcasecmp(optarg, services[ul].name); ul++) {
150                                 if (ul == __arraycount(services))
151                                         errx(EXIT_FAILURE, "%s: unknown service", optarg);
152                         }
153
154                         if (ch == 's')
155                                 service_name = services[ul].name;
156
157                         service_class = services[ul].class;
158                         break;
159
160                 default:
161                         usage();
162                         /* NOTREACHED */
163                 }
164         }
165
166         argc -= optind;
167         argv += optind;
168
169         /* validate options */
170         if (bdaddr_any(&local_bdaddr) || service_class == 0)
171                 usage();
172
173         if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 ||
174             control_path != NULL || (service_name != NULL && l2cap_psm != 0)))
175                 usage();
176
177         /* default options */
178         if (interface_name == NULL)
179                 interface_name = "/dev/tap";
180
181         if (l2cap_psm == 0)
182                 l2cap_psm = L2CAP_PSM_BNEP;
183
184         if (bdaddr_any(&remote_bdaddr) && server_limit == 0) {
185                 if (service_class == SDP_SERVICE_CLASS_PANU)
186                         server_limit = 1;
187                 else
188                         server_limit = 7;
189         }
190
191 #ifdef L2CAP_LM_MASTER
192         if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU)
193                 l2cap_mode |= L2CAP_LM_MASTER;
194 #endif
195
196         /*
197          * fork() now so that the setup can be done in the child process
198          * (as kqueue is not inherited) but block in the parent until the
199          * setup is finished so we can return an error if necessary.
200          */
201         switch(fork()) {
202         case -1: /* bad */
203                 err(EXIT_FAILURE, "fork() failed");
204
205         case 0: /* child */
206                 signal(SIGPIPE, SIG_IGN);
207
208                 openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON);
209
210                 channel_init();
211                 server_init();
212                 event_init();
213                 client_init();
214                 tap_init();
215
216                 main_detach();
217
218                 event_dispatch();
219                 break;
220
221         default: /* parent */
222                 signal(SIGUSR1, main_exit);
223                 wait(&status);
224
225                 if (WIFEXITED(status))
226                         exit(WEXITSTATUS(status));
227
228                 break;
229         }
230
231         err(EXIT_FAILURE, "exiting");
232 }
233
234 static void
235 main_exit(int s)
236 {
237
238         /* child is all grown up */
239         _exit(EXIT_SUCCESS);
240 }
241
242 static void
243 main_detach(void)
244 {
245         int fd;
246
247         if (kill(getppid(), SIGUSR1) == -1)
248                 log_err("Could not signal main process: %m");
249
250         if (setsid() == -1)
251                 log_err("setsid() failed");
252
253         fd = open(_PATH_DEVNULL, O_RDWR, 0);
254         if (fd == -1) {
255                 log_err("Could not open %s", _PATH_DEVNULL);
256         } else {
257                 (void)dup2(fd, STDIN_FILENO);
258                 (void)dup2(fd, STDOUT_FILENO);
259                 (void)dup2(fd, STDERR_FILENO);
260                 close(fd);
261         }
262 }
263
264 static void
265 usage(void)
266 {
267         const char *p = getprogname();
268         int n = strlen(p);
269
270         fprintf(stderr,
271             "usage: %s [-i ifname] [-m mode] -a address -d device\n"
272             "       %*s {-s service | -S service [-p psm]}\n"
273             "       %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n"
274             "       %*s {-s service | -S service}\n"
275             "\n"
276             "Where:\n"
277             "\t-a address  remote bluetooth device\n"
278             "\t-c path     SDP server socket\n"
279             "\t-d device   local bluetooth device\n"
280             "\t-i ifname   tap interface\n"
281             "\t-l limit    limit server sessions\n"
282             "\t-m mode     L2CAP link mode (NOT YET SUPPORTED)\n"
283             "\t-p psm      L2CAP PSM\n"
284             "\t-S service  service name (no SDP)\n"
285             "\t-s service  service name\n"
286             "\n"
287             "Known services:\n"
288             "", p, n, "", p, n, "");
289
290         for (n = 0; n < __arraycount(services); n++)
291                 fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc);
292
293         exit(EXIT_FAILURE);
294 }