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 Acess 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 != 0 || (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 } 295