1 /* $NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 plunky Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
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
31 #include <sys/wait.h>
32
33 #define L2CAP_SOCKET_CHECKED
34 #include <bluetooth.h>
35 #include <err.h>
36 #include <fcntl.h>
37 #include <paths.h>
38 #include <sdp.h>
39 #include <stdio.h>
40 #include <signal.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "btpand.h"
46
47 /* global variables */
48 const char * control_path; /* -c <path> */
49 const char * interface_name; /* -i <ifname> */
50 const char * service_name; /* -s <service> */
51 uint16_t service_class;
52
53 bdaddr_t local_bdaddr; /* -d <addr> */
54 bdaddr_t remote_bdaddr; /* -a <addr> */
55 uint16_t l2cap_psm; /* -p <psm> */
56 int l2cap_mode; /* -m <mode> */
57
58 int server_limit; /* -n <limit> */
59
60 static const struct {
61 const char * name;
62 uint16_t class;
63 const char * desc;
64 } services[] = {
65 { "PANU", SDP_SERVICE_CLASS_PANU, "Personal Area Networking User" },
66 { "NAP", SDP_SERVICE_CLASS_NAP, "Network Access Point" },
67 { "GN", SDP_SERVICE_CLASS_GN, "Group Network" },
68 };
69
70 static void main_exit(int) __dead2;
71 static void main_detach(void);
72 static void usage(void) __dead2;
73
74 int
main(int argc,char * argv[])75 main(int argc, char *argv[])
76 {
77 unsigned long ul;
78 char * ep;
79 int ch, status;
80
81 while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) {
82 switch (ch) {
83 case 'a': /* remote address */
84 if (!bt_aton(optarg, &remote_bdaddr)) {
85 struct hostent *he;
86
87 if ((he = bt_gethostbyname(optarg)) == NULL)
88 errx(EXIT_FAILURE, "%s: %s",
89 optarg, hstrerror(h_errno));
90
91 bdaddr_copy(&remote_bdaddr,
92 (bdaddr_t *)he->h_addr);
93 }
94
95 break;
96
97 case 'c': /* control socket path */
98 control_path = optarg;
99 break;
100
101 case 'd': /* local address */
102 if (!bt_devaddr(optarg, &local_bdaddr)) {
103 struct hostent *he;
104
105 if ((he = bt_gethostbyname(optarg)) == NULL)
106 errx(EXIT_FAILURE, "%s: %s",
107 optarg, hstrerror(h_errno));
108
109 bdaddr_copy(&local_bdaddr,
110 (bdaddr_t *)he->h_addr);
111 }
112 break;
113
114 case 'i': /* tap interface name */
115 if (strchr(optarg, '/') == NULL) {
116 asprintf(&ep, "/dev/%s", optarg);
117 interface_name = ep;
118 } else
119 interface_name = optarg;
120 break;
121
122 case 'l': /* limit server sessions */
123 ul = strtoul(optarg, &ep, 10);
124 if (*optarg == '\0' || *ep != '\0' || ul == 0)
125 errx(EXIT_FAILURE, "%s: invalid session limit",
126 optarg);
127
128 server_limit = ul;
129 break;
130
131 case 'm': /* link mode */
132 warnx("Setting link mode is not yet supported");
133 break;
134
135 case 'p': /* protocol/service multiplexer */
136 ul = strtoul(optarg, &ep, 0);
137 if (*optarg == '\0' || *ep != '\0'
138 || ul > 0xffff || L2CAP_PSM_INVALID(ul))
139 errx(EXIT_FAILURE, "%s: invalid PSM", optarg);
140
141 l2cap_psm = ul;
142 break;
143
144 case 's': /* service */
145 case 'S': /* service (no SDP) */
146 for (ul = 0; ul < __arraycount(services); ul++) {
147 if (strcasecmp(optarg, services[ul].name) == 0)
148 break;
149 }
150
151 if (ul == __arraycount(services))
152 errx(EXIT_FAILURE, "%s: unknown service", optarg);
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
main_exit(int s)235 main_exit(int s)
236 {
237
238 /* child is all grown up */
239 _exit(EXIT_SUCCESS);
240 }
241
242 static void
main_detach(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
usage(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 }
295