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/cdefs.h> 32 __COPYRIGHT("@(#) Copyright (c) 2008 Iain Hibbert. All rights reserved."); 33 __RCSID("$NetBSD: btpand.c,v 1.1 2008/08/17 13:20:57 plunky Exp $"); 34 35 #include <sys/wait.h> 36 37 #define L2CAP_SOCKET_CHECKED 38 #include <bluetooth.h> 39 #include <err.h> 40 #include <fcntl.h> 41 #include <paths.h> 42 #include <sdp.h> 43 #include <stdio.h> 44 #include <signal.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "btpand.h" 50 51 /* global variables */ 52 const char * control_path; /* -c <path> */ 53 const char * interface_name; /* -i <ifname> */ 54 const char * service_name; /* -s <service> */ 55 uint16_t service_class; 56 57 bdaddr_t local_bdaddr; /* -d <addr> */ 58 bdaddr_t remote_bdaddr; /* -a <addr> */ 59 uint16_t l2cap_psm; /* -p <psm> */ 60 int l2cap_mode; /* -m <mode> */ 61 62 int server_limit; /* -n <limit> */ 63 64 static const struct { 65 const char * name; 66 uint16_t class; 67 const char * desc; 68 } services[] = { 69 { "PANU", SDP_SERVICE_CLASS_PANU, "Personal Area Networking User" }, 70 { "NAP", SDP_SERVICE_CLASS_NAP, "Network Access Point" }, 71 { "GN", SDP_SERVICE_CLASS_GN, "Group Network" }, 72 }; 73 74 static void main_exit(int) __dead2; 75 static void main_detach(void); 76 static void usage(void) __dead2; 77 78 int 79 main(int argc, char *argv[]) 80 { 81 unsigned long ul; 82 char * ep; 83 int ch, status; 84 85 while ((ch = getopt(argc, argv, "a:c:d:i:l:m:p:S:s:")) != -1) { 86 switch (ch) { 87 case 'a': /* remote address */ 88 if (!bt_aton(optarg, &remote_bdaddr)) { 89 struct hostent *he; 90 91 if ((he = bt_gethostbyname(optarg)) == NULL) 92 errx(EXIT_FAILURE, "%s: %s", 93 optarg, hstrerror(h_errno)); 94 95 bdaddr_copy(&remote_bdaddr, 96 (bdaddr_t *)he->h_addr); 97 } 98 99 break; 100 101 case 'c': /* control socket path */ 102 control_path = optarg; 103 break; 104 105 case 'd': /* local address */ 106 if (!bt_devaddr(optarg, &local_bdaddr)) { 107 struct hostent *he; 108 109 if ((he = bt_gethostbyname(optarg)) == NULL) 110 errx(EXIT_FAILURE, "%s: %s", 111 optarg, hstrerror(h_errno)); 112 113 bdaddr_copy(&local_bdaddr, 114 (bdaddr_t *)he->h_addr); 115 } 116 break; 117 118 case 'i': /* tap interface name */ 119 if (strchr(optarg, '/') == NULL) { 120 asprintf(&ep, "/dev/%s", optarg); 121 interface_name = ep; 122 } else 123 interface_name = optarg; 124 break; 125 126 case 'l': /* limit server sessions */ 127 ul = strtoul(optarg, &ep, 10); 128 if (*optarg == '\0' || *ep != '\0' || ul == 0) 129 errx(EXIT_FAILURE, "%s: invalid session limit", 130 optarg); 131 132 server_limit = ul; 133 break; 134 135 case 'm': /* link mode */ 136 warnx("Setting link mode is not yet supported"); 137 break; 138 139 case 'p': /* protocol/service multiplexer */ 140 ul = strtoul(optarg, &ep, 0); 141 if (*optarg == '\0' || *ep != '\0' 142 || ul > 0xffff || L2CAP_PSM_INVALID(ul)) 143 errx(EXIT_FAILURE, "%s: invalid PSM", optarg); 144 145 l2cap_psm = ul; 146 break; 147 148 case 's': /* service */ 149 case 'S': /* service (no SDP) */ 150 for (ul = 0; strcasecmp(optarg, services[ul].name); ul++) { 151 if (ul == __arraycount(services)) 152 errx(EXIT_FAILURE, "%s: unknown service", optarg); 153 } 154 155 if (ch == 's') 156 service_name = services[ul].name; 157 158 service_class = services[ul].class; 159 break; 160 161 default: 162 usage(); 163 /* NOTREACHED */ 164 } 165 } 166 167 argc -= optind; 168 argv += optind; 169 170 /* validate options */ 171 if (bdaddr_any(&local_bdaddr) || service_class == 0) 172 usage(); 173 174 if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 || 175 control_path != NULL || (service_name != NULL && l2cap_psm != 0))) 176 usage(); 177 178 /* default options */ 179 if (interface_name == NULL) 180 interface_name = "/dev/tap"; 181 182 if (l2cap_psm == 0) 183 l2cap_psm = L2CAP_PSM_BNEP; 184 185 if (bdaddr_any(&remote_bdaddr) && server_limit == 0) { 186 if (service_class == SDP_SERVICE_CLASS_PANU) 187 server_limit = 1; 188 else 189 server_limit = 7; 190 } 191 192 #ifdef L2CAP_LM_MASTER 193 if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU) 194 l2cap_mode |= L2CAP_LM_MASTER; 195 #endif 196 197 /* 198 * fork() now so that the setup can be done in the child process 199 * (as kqueue is not inherited) but block in the parent until the 200 * setup is finished so we can return an error if necessary. 201 */ 202 switch(fork()) { 203 case -1: /* bad */ 204 err(EXIT_FAILURE, "fork() failed"); 205 206 case 0: /* child */ 207 signal(SIGPIPE, SIG_IGN); 208 209 openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON); 210 211 channel_init(); 212 server_init(); 213 event_init(); 214 client_init(); 215 tap_init(); 216 217 main_detach(); 218 219 event_dispatch(); 220 break; 221 222 default: /* parent */ 223 signal(SIGUSR1, main_exit); 224 wait(&status); 225 226 if (WIFEXITED(status)) 227 exit(WEXITSTATUS(status)); 228 229 break; 230 } 231 232 err(EXIT_FAILURE, "exiting"); 233 } 234 235 static void 236 main_exit(int s) 237 { 238 239 /* child is all grown up */ 240 _exit(EXIT_SUCCESS); 241 } 242 243 static void 244 main_detach(void) 245 { 246 int fd; 247 248 if (kill(getppid(), SIGUSR1) == -1) 249 log_err("Could not signal main process: %m"); 250 251 if (setsid() == -1) 252 log_err("setsid() failed"); 253 254 fd = open(_PATH_DEVNULL, O_RDWR, 0); 255 if (fd == -1) { 256 log_err("Could not open %s", _PATH_DEVNULL); 257 } else { 258 (void)dup2(fd, STDIN_FILENO); 259 (void)dup2(fd, STDOUT_FILENO); 260 (void)dup2(fd, STDERR_FILENO); 261 close(fd); 262 } 263 } 264 265 static void 266 usage(void) 267 { 268 const char *p = getprogname(); 269 int n = strlen(p); 270 271 fprintf(stderr, 272 "usage: %s [-i ifname] [-m mode] -a address -d device\n" 273 " %*s {-s service | -S service [-p psm]}\n" 274 " %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n" 275 " %*s {-s service | -S service}\n" 276 "\n" 277 "Where:\n" 278 "\t-a address remote bluetooth device\n" 279 "\t-c path SDP server socket\n" 280 "\t-d device local bluetooth device\n" 281 "\t-i ifname tap interface\n" 282 "\t-l limit limit server sessions\n" 283 "\t-m mode L2CAP link mode (NOT YET SUPPORTED)\n" 284 "\t-p psm L2CAP PSM\n" 285 "\t-S service service name (no SDP)\n" 286 "\t-s service service name\n" 287 "\n" 288 "Known services:\n" 289 "", p, n, "", p, n, ""); 290 291 for (n = 0; n < __arraycount(services); n++) 292 fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc); 293 294 exit(EXIT_FAILURE); 295 } 296