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 } 297