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