1 /* 2 * rfcomm_sppd.c 3 * 4 * Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com> 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $Id: rfcomm_sppd.c,v 1.4 2003/09/07 18:15:55 max Exp $ 29 * $FreeBSD$ 30 */ 31 32 #include <sys/stat.h> 33 #include <bluetooth.h> 34 #include <ctype.h> 35 #include <err.h> 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <grp.h> 39 #include <limits.h> 40 #include <paths.h> 41 #include <sdp.h> 42 #include <signal.h> 43 #include <stdarg.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <syslog.h> 48 #include <termios.h> 49 #include <unistd.h> 50 51 #define SPPD_IDENT "rfcomm_sppd" 52 #define SPPD_BUFFER_SIZE 1024 53 #define max(a, b) (((a) > (b))? (a) : (b)) 54 55 int rfcomm_channel_lookup (bdaddr_t const *local, 56 bdaddr_t const *remote, 57 int service, int *channel, int *error); 58 59 static int sppd_ttys_open (char const *tty, int *amaster, int *aslave); 60 static int sppd_read (int fd, char *buffer, int size); 61 static int sppd_write (int fd, char *buffer, int size); 62 static void sppd_sighandler (int s); 63 static void usage (void); 64 65 static int done; /* are we done? */ 66 67 /* Main */ 68 int 69 main(int argc, char *argv[]) 70 { 71 struct sigaction sa; 72 struct sockaddr_rfcomm ra; 73 bdaddr_t addr; 74 int n, background, channel, service, 75 s, amaster, aslave, fd, doserver; 76 fd_set rfd; 77 char *tty = NULL, *ep = NULL, buf[SPPD_BUFFER_SIZE]; 78 79 memcpy(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)); 80 background = channel = 0; 81 service = SDP_SERVICE_CLASS_SERIAL_PORT; 82 doserver = 0; 83 84 /* Parse command line options */ 85 while ((n = getopt(argc, argv, "a:bc:t:hS")) != -1) { 86 switch (n) { 87 case 'a': /* BDADDR */ 88 if (!bt_aton(optarg, &addr)) { 89 struct hostent *he = NULL; 90 91 if ((he = bt_gethostbyname(optarg)) == NULL) 92 errx(1, "%s: %s", optarg, hstrerror(h_errno)); 93 94 memcpy(&addr, he->h_addr, sizeof(addr)); 95 } 96 break; 97 98 case 'c': /* RFCOMM channel */ 99 channel = strtoul(optarg, &ep, 10); 100 if (*ep != '\0') { 101 channel = 0; 102 switch (tolower(optarg[0])) { 103 case 'd': /* DialUp Networking */ 104 service = SDP_SERVICE_CLASS_DIALUP_NETWORKING; 105 break; 106 107 case 'f': /* Fax */ 108 service = SDP_SERVICE_CLASS_FAX; 109 break; 110 111 case 'l': /* LAN */ 112 service = SDP_SERVICE_CLASS_LAN_ACCESS_USING_PPP; 113 break; 114 115 case 's': /* Serial Port */ 116 service = SDP_SERVICE_CLASS_SERIAL_PORT; 117 break; 118 119 default: 120 errx(1, "Unknown service name: %s", 121 optarg); 122 /* NOT REACHED */ 123 } 124 } 125 break; 126 127 case 'b': /* Run in background */ 128 background = 1; 129 break; 130 131 case 't': /* Slave TTY name */ 132 if (optarg[0] != '/') 133 asprintf(&tty, "%s%s", _PATH_DEV, optarg); 134 else 135 tty = optarg; 136 break; 137 138 case 'S': 139 doserver = 1; 140 break; 141 142 case 'h': 143 default: 144 usage(); 145 /* NOT REACHED */ 146 } 147 } 148 149 /* Check if we have everything we need */ 150 if (!doserver && memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) == 0) 151 usage(); 152 /* NOT REACHED */ 153 154 /* Set signal handlers */ 155 memset(&sa, 0, sizeof(sa)); 156 sa.sa_handler = sppd_sighandler; 157 158 if (sigaction(SIGTERM, &sa, NULL) < 0) 159 err(1, "Could not sigaction(SIGTERM)"); 160 161 if (sigaction(SIGHUP, &sa, NULL) < 0) 162 err(1, "Could not sigaction(SIGHUP)"); 163 164 if (sigaction(SIGINT, &sa, NULL) < 0) 165 err(1, "Could not sigaction(SIGINT)"); 166 167 sa.sa_handler = SIG_IGN; 168 sa.sa_flags = SA_NOCLDWAIT; 169 170 if (sigaction(SIGCHLD, &sa, NULL) < 0) 171 err(1, "Could not sigaction(SIGCHLD)"); 172 173 /* Open TTYs */ 174 if (tty == NULL) { 175 if (background || doserver) 176 usage(); 177 178 amaster = STDIN_FILENO; 179 fd = STDOUT_FILENO; 180 } else { 181 if (sppd_ttys_open(tty, &amaster, &aslave) < 0) 182 exit(1); 183 184 fd = amaster; 185 } 186 187 /* Open RFCOMM connection */ 188 189 if (doserver) { 190 struct sockaddr_rfcomm ma; 191 bdaddr_t bt_addr_any; 192 sdp_lan_profile_t lan; 193 void *ss; 194 uint32_t sdp_handle; 195 int acceptsock, aaddrlen; 196 197 if (channel == 0) { 198 /* XXX: should check if selected channel is unused */ 199 channel = (getpid() % 30) + 1; 200 } 201 acceptsock = socket(PF_BLUETOOTH, SOCK_STREAM, 202 BLUETOOTH_PROTO_RFCOMM); 203 if (acceptsock < 0) 204 err(1, "Could not create socket"); 205 206 memset(&ma, 0, sizeof(ma)); 207 ma.rfcomm_len = sizeof(ma); 208 ma.rfcomm_family = AF_BLUETOOTH; 209 ma.rfcomm_channel = channel; 210 211 if (bind(acceptsock, (struct sockaddr *)&ma, sizeof(ma)) < 0) 212 err(1, "Could not bind socket -- channel %d in use?", 213 channel); 214 if (listen(acceptsock, 10) != 0) 215 err(1, "Could not listen on socket"); 216 217 ss = sdp_open_local(NULL); 218 if (ss == NULL) 219 errx(1, "Unable to create local SDP session"); 220 if (sdp_error(ss) != 0) 221 errx(1, "Unable to open local SDP session. %s (%d)", 222 strerror(sdp_error(ss)), sdp_error(ss)); 223 memset(&lan, 0, sizeof(lan)); 224 lan.server_channel = channel; 225 226 memcpy(&bt_addr_any, NG_HCI_BDADDR_ANY, sizeof(bt_addr_any)); 227 if (sdp_register_service(ss, service, &bt_addr_any, 228 (void *)&lan, sizeof(lan), &sdp_handle) != 0) { 229 errx(1, "Unable to register LAN service with " 230 "local SDP daemon. %s (%d)", 231 strerror(sdp_error(ss)), sdp_error(ss)); 232 } 233 234 s = -1; 235 while (s < 0) { 236 aaddrlen = sizeof(ra); 237 s = accept(acceptsock, (struct sockaddr *)&ra, 238 &aaddrlen); 239 if (s < 0) 240 err(1, "Unable to accept()"); 241 if (memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) && 242 memcmp(&addr, &ra.rfcomm_bdaddr, sizeof(addr))) { 243 warnx("Connect from wrong client"); 244 close(s); 245 s = -1; 246 } 247 } 248 sdp_unregister_service(ss, sdp_handle); 249 sdp_close(ss); 250 close(acceptsock); 251 } else { 252 /* Check channel, if was not set then obtain it via SDP */ 253 if (channel == 0 && service != 0) 254 if (rfcomm_channel_lookup(NULL, &addr, 255 service, &channel, &n) != 0) 256 errc(1, n, "Could not obtain RFCOMM channel"); 257 if (channel <= 0 || channel > 30) 258 errx(1, "Invalid RFCOMM channel number %d", channel); 259 260 s = socket(PF_BLUETOOTH, SOCK_STREAM, BLUETOOTH_PROTO_RFCOMM); 261 if (s < 0) 262 err(1, "Could not create socket"); 263 264 memset(&ra, 0, sizeof(ra)); 265 ra.rfcomm_len = sizeof(ra); 266 ra.rfcomm_family = AF_BLUETOOTH; 267 268 if (bind(s, (struct sockaddr *) &ra, sizeof(ra)) < 0) 269 err(1, "Could not bind socket"); 270 271 memcpy(&ra.rfcomm_bdaddr, &addr, sizeof(ra.rfcomm_bdaddr)); 272 ra.rfcomm_channel = channel; 273 274 if (connect(s, (struct sockaddr *) &ra, sizeof(ra)) < 0) 275 err(1, "Could not connect socket"); 276 } 277 278 /* Became daemon if required */ 279 if (background) { 280 switch (fork()) { 281 case -1: 282 err(1, "Could not fork()"); 283 /* NOT REACHED */ 284 285 case 0: 286 exit(0); 287 /* NOT REACHED */ 288 289 default: 290 if (daemon(0, 0) < 0) 291 err(1, "Could not daemon()"); 292 break; 293 } 294 } 295 296 openlog(SPPD_IDENT, LOG_NDELAY|LOG_PERROR|LOG_PID, LOG_DAEMON); 297 syslog(LOG_INFO, "Starting on %s...", (tty != NULL)? tty : "stdin/stdout"); 298 299 for (done = 0; !done; ) { 300 FD_ZERO(&rfd); 301 FD_SET(amaster, &rfd); 302 FD_SET(s, &rfd); 303 304 n = select(max(amaster, s) + 1, &rfd, NULL, NULL, NULL); 305 if (n < 0) { 306 if (errno == EINTR) 307 continue; 308 309 syslog(LOG_ERR, "Could not select(). %s", 310 strerror(errno)); 311 exit(1); 312 } 313 314 if (n == 0) 315 continue; 316 317 if (FD_ISSET(amaster, &rfd)) { 318 n = sppd_read(amaster, buf, sizeof(buf)); 319 if (n < 0) { 320 syslog(LOG_ERR, "Could not read master pty, " \ 321 "fd=%d. %s", amaster, strerror(errno)); 322 exit(1); 323 } 324 325 if (n == 0) 326 break; /* XXX */ 327 328 if (sppd_write(s, buf, n) < 0) { 329 syslog(LOG_ERR, "Could not write to socket, " \ 330 "fd=%d, size=%d. %s", 331 s, n, strerror(errno)); 332 exit(1); 333 } 334 } 335 336 if (FD_ISSET(s, &rfd)) { 337 n = sppd_read(s, buf, sizeof(buf)); 338 if (n < 0) { 339 syslog(LOG_ERR, "Could not read socket, " \ 340 "fd=%d. %s", s, strerror(errno)); 341 exit(1); 342 } 343 344 if (n == 0) 345 break; 346 347 if (sppd_write(fd, buf, n) < 0) { 348 syslog(LOG_ERR, "Could not write to master " \ 349 "pty, fd=%d, size=%d. %s", 350 fd, n, strerror(errno)); 351 exit(1); 352 } 353 } 354 } 355 356 syslog(LOG_INFO, "Completed on %s", (tty != NULL)? tty : "stdin/stdout"); 357 closelog(); 358 359 close(s); 360 361 if (tty != NULL) { 362 close(aslave); 363 close(amaster); 364 } 365 366 return (0); 367 } 368 369 /* Open TTYs */ 370 static int 371 sppd_ttys_open(char const *tty, int *amaster, int *aslave) 372 { 373 char pty[PATH_MAX], *slash; 374 struct group *gr = NULL; 375 gid_t ttygid; 376 struct termios tio; 377 378 /* 379 * Construct master PTY name. The slave tty name must be less then 380 * PATH_MAX characters in length, must contain '/' character and 381 * must not end with '/'. 382 */ 383 384 if (strlen(tty) >= sizeof(pty)) { 385 syslog(LOG_ERR, "Slave tty name is too long"); 386 return (-1); 387 } 388 389 strlcpy(pty, tty, sizeof(pty)); 390 slash = strrchr(pty, '/'); 391 if (slash == NULL || slash[1] == '\0') { 392 syslog(LOG_ERR, "Invalid slave tty name (%s)", tty); 393 return (-1); 394 } 395 396 slash[1] = 'p'; 397 398 if (strcmp(pty, tty) == 0) { 399 syslog(LOG_ERR, "Master and slave tty are the same (%s)", tty); 400 return (-1); 401 } 402 403 if ((*amaster = open(pty, O_RDWR, 0)) < 0) { 404 syslog(LOG_ERR, "Could not open(%s). %s", pty, strerror(errno)); 405 return (-1); 406 } 407 408 /* 409 * Slave TTY 410 */ 411 412 if ((gr = getgrnam("tty")) != NULL) 413 ttygid = gr->gr_gid; 414 else 415 ttygid = -1; 416 417 (void) chown(tty, getuid(), ttygid); 418 (void) chmod(tty, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP); 419 (void) revoke(tty); 420 421 if ((*aslave = open(tty, O_RDWR, 0)) < 0) { 422 syslog(LOG_ERR, "Could not open(%s). %s", tty, strerror(errno)); 423 close(*amaster); 424 return (-1); 425 } 426 427 /* 428 * Make slave TTY raw 429 */ 430 431 cfmakeraw(&tio); 432 433 if (tcsetattr(*aslave, TCSANOW, &tio) < 0) { 434 syslog(LOG_ERR, "Could not tcsetattr(). %s", strerror(errno)); 435 close(*aslave); 436 close(*amaster); 437 return (-1); 438 } 439 440 return (0); 441 } /* sppd_ttys_open */ 442 443 /* Read data */ 444 static int 445 sppd_read(int fd, char *buffer, int size) 446 { 447 int n; 448 449 again: 450 n = read(fd, buffer, size); 451 if (n < 0) { 452 if (errno == EINTR) 453 goto again; 454 455 return (-1); 456 } 457 458 return (n); 459 } /* sppd_read */ 460 461 /* Write data */ 462 static int 463 sppd_write(int fd, char *buffer, int size) 464 { 465 int n, wrote; 466 467 for (wrote = 0; size > 0; ) { 468 n = write(fd, buffer, size); 469 switch (n) { 470 case -1: 471 if (errno != EINTR) 472 return (-1); 473 break; 474 475 case 0: 476 /* XXX can happen? */ 477 break; 478 479 default: 480 wrote += n; 481 buffer += n; 482 size -= n; 483 break; 484 } 485 } 486 487 return (wrote); 488 } /* sppd_write */ 489 490 /* Signal handler */ 491 static void 492 sppd_sighandler(int s) 493 { 494 syslog(LOG_INFO, "Signal %d received. Total %d signals received\n", 495 s, ++ done); 496 } /* sppd_sighandler */ 497 498 /* Display usage and exit */ 499 static void 500 usage(void) 501 { 502 fprintf(stdout, 503 "Usage: %s options\n" \ 504 "Where options are:\n" \ 505 "\t-a address Peer address (required in client mode)\n" \ 506 "\t-b Run in background\n" \ 507 "\t-c channel RFCOMM channel to connect to or listen on\n" \ 508 "\t-t tty TTY name (required in background or server mode)\n" \ 509 "\t-S Server mode\n" \ 510 "\t-h Display this message\n", SPPD_IDENT); 511 exit(255); 512 } /* usage */ 513 514