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 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; strcasecmp(optarg, services[ul].name); ul++) { 147 if (ul == __arraycount(services)) 148 errx(EXIT_FAILURE, "%s: unknown service", optarg); 149 } 150 151 if (ch == 's') 152 service_name = services[ul].name; 153 154 service_class = services[ul].class; 155 break; 156 157 default: 158 usage(); 159 /* NOTREACHED */ 160 } 161 } 162 163 argc -= optind; 164 argv += optind; 165 166 /* validate options */ 167 if (bdaddr_any(&local_bdaddr) || service_class == 0) 168 usage(); 169 170 if (!bdaddr_any(&remote_bdaddr) && (server_limit != 0 || 171 control_path != NULL || (service_name != NULL && l2cap_psm != 0))) 172 usage(); 173 174 /* default options */ 175 if (interface_name == NULL) 176 interface_name = "/dev/tap"; 177 178 if (l2cap_psm == 0) 179 l2cap_psm = L2CAP_PSM_BNEP; 180 181 if (bdaddr_any(&remote_bdaddr) && server_limit == 0) { 182 if (service_class == SDP_SERVICE_CLASS_PANU) 183 server_limit = 1; 184 else 185 server_limit = 7; 186 } 187 188 #ifdef L2CAP_LM_MASTER 189 if (server_limit > 1 && service_class != SDP_SERVICE_CLASS_PANU) 190 l2cap_mode |= L2CAP_LM_MASTER; 191 #endif 192 193 /* 194 * fork() now so that the setup can be done in the child process 195 * (as kqueue is not inherited) but block in the parent until the 196 * setup is finished so we can return an error if necessary. 197 */ 198 switch(fork()) { 199 case -1: /* bad */ 200 err(EXIT_FAILURE, "fork() failed"); 201 202 case 0: /* child */ 203 signal(SIGPIPE, SIG_IGN); 204 205 openlog(getprogname(), LOG_NDELAY | LOG_PERROR | LOG_PID, LOG_DAEMON); 206 207 channel_init(); 208 server_init(); 209 event_init(); 210 client_init(); 211 tap_init(); 212 213 main_detach(); 214 215 event_dispatch(); 216 break; 217 218 default: /* parent */ 219 signal(SIGUSR1, main_exit); 220 wait(&status); 221 222 if (WIFEXITED(status)) 223 exit(WEXITSTATUS(status)); 224 225 break; 226 } 227 228 err(EXIT_FAILURE, "exiting"); 229 } 230 231 static void 232 main_exit(int s) 233 { 234 235 /* child is all grown up */ 236 _exit(EXIT_SUCCESS); 237 } 238 239 static void 240 main_detach(void) 241 { 242 int fd; 243 244 if (kill(getppid(), SIGUSR1) == -1) 245 log_err("Could not signal main process: %m"); 246 247 if (setsid() == -1) 248 log_err("setsid() failed"); 249 250 fd = open(_PATH_DEVNULL, O_RDWR, 0); 251 if (fd == -1) { 252 log_err("Could not open %s", _PATH_DEVNULL); 253 } else { 254 (void)dup2(fd, STDIN_FILENO); 255 (void)dup2(fd, STDOUT_FILENO); 256 (void)dup2(fd, STDERR_FILENO); 257 close(fd); 258 } 259 } 260 261 static void 262 usage(void) 263 { 264 const char *p = getprogname(); 265 int n = strlen(p); 266 267 fprintf(stderr, 268 "usage: %s [-i ifname] [-m mode] -a address -d device\n" 269 " %*s {-s service | -S service [-p psm]}\n" 270 " %s [-c path] [-i ifname] [-l limit] [-m mode] [-p psm] -d device\n" 271 " %*s {-s service | -S service}\n" 272 "\n" 273 "Where:\n" 274 "\t-a address remote bluetooth device\n" 275 "\t-c path SDP server socket\n" 276 "\t-d device local bluetooth device\n" 277 "\t-i ifname tap interface\n" 278 "\t-l limit limit server sessions\n" 279 "\t-m mode L2CAP link mode (NOT YET SUPPORTED)\n" 280 "\t-p psm L2CAP PSM\n" 281 "\t-S service service name (no SDP)\n" 282 "\t-s service service name\n" 283 "\n" 284 "Known services:\n" 285 "", p, n, "", p, n, ""); 286 287 for (n = 0; n < __arraycount(services); n++) 288 fprintf(stderr, "\t%s\t%s\n", services[n].name, services[n].desc); 289 290 exit(EXIT_FAILURE); 291 } 292