usr.bin/bluetooth/rfcomm_sppd/rfcomm_sppd.c

   1 /*
   2  * rfcomm_sppd.c
   3  */
   4
   5 /*-
   6  * SPDX-License-Identifier: BSD-2-Clause
   7  *
   8  * Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $Id: rfcomm_sppd.c,v 1.4 2003/09/07 18:15:55 max Exp $
  33  */
  34
  35 #include <sys/stat.h>
  36 #include <sys/types.h>
  37 #define L2CAP_SOCKET_CHECKED
  38 #include <bluetooth.h>
  39 #include <ctype.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <grp.h>
  44 #include <limits.h>
  45 #include <paths.h>
  46 #include <sdp.h>
  47 #include <signal.h>
  48 #include <stdarg.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <syslog.h>
  53 #include <termios.h>
  54 #include <unistd.h>
  55 #include <libutil.h>
  56
  57 #define SPPD_IDENT              "rfcomm_sppd"
  58 #define SPPD_BUFFER_SIZE        1024
  59 #define max(a, b)               (((a) > (b))? (a) : (b))
  60
  61 int             rfcomm_channel_lookup   (bdaddr_t const *local,
  62                                          bdaddr_t const *remote,
  63                                          int service, int *channel, int *error);
  64
  65 static int      sppd_ttys_open  (char **tty, int *amaster, int *aslave);
  66 static int      sppd_read       (int fd, char *buffer, int size);
  67 static int      sppd_write      (int fd, char *buffer, int size);
  68 static void     sppd_sighandler (int s);
  69 static void     usage           (void);
  70
  71 static int      done;   /* are we done? */
  72
  73 /* Main */
  74 int
  75 main(int argc, char *argv[])
  76 {
  77         struct sigaction         sa;
  78         struct sockaddr_rfcomm   ra;
  79         bdaddr_t                 addr;
  80         int                      n, background, channel, service,
  81                                  s, amaster, aslave, fd, doserver,
  82                                  dopty;
  83         fd_set                   rfd;
  84         char                    *tty = NULL, *ep = NULL, buf[SPPD_BUFFER_SIZE];
  85
  86         memcpy(&addr, NG_HCI_BDADDR_ANY, sizeof(addr));
  87         background = channel = 0;
  88         service = SDP_SERVICE_CLASS_SERIAL_PORT;
  89         doserver = 0;
  90         dopty = 0;
  91
  92         /* Parse command line options */
  93         while ((n = getopt(argc, argv, "a:bc:thS")) != -1) {
  94                 switch (n) {
  95                 case 'a': /* BDADDR */
  96                         if (!bt_aton(optarg, &addr)) {
  97                                 struct hostent  *he = NULL;
  98
  99                                 if ((he = bt_gethostbyname(optarg)) == NULL)
 100                                         errx(1, "%s: %s", optarg, hstrerror(h_errno));
 101
 102                                 memcpy(&addr, he->h_addr, sizeof(addr));
 103                         }
 104                         break;
 105
 106                 case 'c': /* RFCOMM channel */
 107                         channel = strtoul(optarg, &ep, 10);
 108                         if (*ep != '\0') {
 109                                 channel = 0;
 110                                 switch (tolower(optarg[0])) {
 111                                 case 'd': /* DialUp Networking */
 112                                         service = SDP_SERVICE_CLASS_DIALUP_NETWORKING;
 113                                         break;
 114
 115                                 case 'f': /* Fax */
 116                                         service = SDP_SERVICE_CLASS_FAX;
 117                                         break;
 118
 119                                 case 'l': /* LAN */
 120                                         service = SDP_SERVICE_CLASS_LAN_ACCESS_USING_PPP;
 121                                         break;
 122
 123                                 case 's': /* Serial Port */
 124                                         service = SDP_SERVICE_CLASS_SERIAL_PORT;
 125                                         break;
 126
 127                                 default:
 128                                         errx(1, "Unknown service name: %s",
 129                                                 optarg);
 130                                         /* NOT REACHED */
 131                                 }
 132                         }
 133                         break;
 134
 135                 case 'b': /* Run in background */
 136                         background = 1;
 137                         break;
 138
 139                 case 't': /* Open pseudo TTY */
 140                         dopty = 1;
 141                         break;
 142
 143                 case 'S':
 144                         doserver = 1;
 145                         break;
 146
 147                 case 'h':
 148                 default:
 149                         usage();
 150                         /* NOT REACHED */
 151                 }
 152         }
 153
 154         /* Check if we have everything we need */
 155         if (!doserver && memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) == 0)
 156                 usage();
 157                 /* NOT REACHED */
 158
 159         /* Set signal handlers */
 160         memset(&sa, 0, sizeof(sa));
 161         sa.sa_handler = sppd_sighandler;
 162
 163         if (sigaction(SIGTERM, &sa, NULL) < 0)
 164                 err(1, "Could not sigaction(SIGTERM)");
 165
 166         if (sigaction(SIGHUP, &sa, NULL) < 0)
 167                 err(1, "Could not sigaction(SIGHUP)");
 168
 169         if (sigaction(SIGINT, &sa, NULL) < 0)
 170                 err(1, "Could not sigaction(SIGINT)");
 171
 172         sa.sa_handler = SIG_IGN;
 173         sa.sa_flags = SA_NOCLDWAIT;
 174
 175         if (sigaction(SIGCHLD, &sa, NULL) < 0)
 176                 err(1, "Could not sigaction(SIGCHLD)");
 177
 178         /* Open TTYs */
 179         if (dopty) {
 180                 if (sppd_ttys_open(&tty, &amaster, &aslave) < 0)
 181                         exit(1);
 182
 183                 fd = amaster;
 184         } else {
 185                 if (background)
 186                         usage();
 187
 188                 amaster = STDIN_FILENO;
 189                 fd = STDOUT_FILENO;
 190         }
 191
 192         /* Open RFCOMM connection */
 193
 194         if (doserver) {
 195                 struct sockaddr_rfcomm   ma;
 196                 bdaddr_t                 bt_addr_any;
 197                 sdp_sp_profile_t         sp;
 198                 void                    *ss;
 199                 uint32_t                 sdp_handle;
 200                 int                      acceptsock, aaddrlen;
 201
 202                 acceptsock = socket(PF_BLUETOOTH, SOCK_STREAM,
 203                                         BLUETOOTH_PROTO_RFCOMM);
 204                 if (acceptsock < 0)
 205                         err(1, "Could not create socket");
 206
 207                 memcpy(&bt_addr_any, NG_HCI_BDADDR_ANY, sizeof(bt_addr_any));
 208
 209                 memset(&ma, 0, sizeof(ma));
 210                 ma.rfcomm_len = sizeof(ma);
 211                 ma.rfcomm_family = AF_BLUETOOTH;
 212                 memcpy(&ma.rfcomm_bdaddr, &bt_addr_any, sizeof(bt_addr_any));
 213                 ma.rfcomm_channel = channel;
 214
 215                 if (bind(acceptsock, (struct sockaddr *)&ma, sizeof(ma)) < 0)
 216                         err(1, "Could not bind socket on channel %d", channel);
 217                 if (listen(acceptsock, 10) != 0)
 218                         err(1, "Could not listen on socket");
 219
 220                 aaddrlen = sizeof(ma);
 221                 if (getsockname(acceptsock, (struct sockaddr *)&ma, &aaddrlen) < 0)
 222                         err(1, "Could not get socket name");
 223                 channel = ma.rfcomm_channel;
 224
 225                 ss = sdp_open_local(NULL);
 226                 if (ss == NULL)
 227                         errx(1, "Unable to create local SDP session");
 228                 if (sdp_error(ss) != 0)
 229                         errx(1, "Unable to open local SDP session. %s (%d)",
 230                             strerror(sdp_error(ss)), sdp_error(ss));
 231                 memset(&sp, 0, sizeof(sp));
 232                 sp.server_channel = channel;
 233
 234                 if (sdp_register_service(ss, SDP_SERVICE_CLASS_SERIAL_PORT,
 235                                 &bt_addr_any, (void *)&sp, sizeof(sp),
 236                                 &sdp_handle) != 0) {
 237                         errx(1, "Unable to register LAN service with "
 238                             "local SDP daemon. %s (%d)",
 239                             strerror(sdp_error(ss)), sdp_error(ss));
 240                 }
 241
 242                 s = -1;
 243                 while (s < 0) {
 244                         aaddrlen = sizeof(ra);
 245                         s = accept(acceptsock, (struct sockaddr *)&ra,
 246                             &aaddrlen);
 247                         if (s < 0)
 248                                 err(1, "Unable to accept()");
 249                         if (memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) &&
 250                             memcmp(&addr, &ra.rfcomm_bdaddr, sizeof(addr))) {
 251                                 warnx("Connect from wrong client");
 252                                 close(s);
 253                                 s = -1;
 254                         }
 255                 }
 256                 sdp_unregister_service(ss, sdp_handle);
 257                 sdp_close(ss);
 258                 close(acceptsock);
 259         } else {
 260                 /* Check channel, if was not set then obtain it via SDP */
 261                 if (channel == 0 && service != 0)
 262                         if (rfcomm_channel_lookup(NULL, &addr,
 263                                     service, &channel, &n) != 0)
 264                                 errc(1, n, "Could not obtain RFCOMM channel");
 265                 if (channel <= 0 || channel > 30)
 266                         errx(1, "Invalid RFCOMM channel number %d", channel);
 267
 268                 s = socket(PF_BLUETOOTH, SOCK_STREAM, BLUETOOTH_PROTO_RFCOMM);
 269                 if (s < 0)
 270                         err(1, "Could not create socket");
 271
 272                 memset(&ra, 0, sizeof(ra));
 273                 ra.rfcomm_len = sizeof(ra);
 274                 ra.rfcomm_family = AF_BLUETOOTH;
 275
 276                 if (bind(s, (struct sockaddr *) &ra, sizeof(ra)) < 0)
 277                         err(1, "Could not bind socket");
 278
 279                 memcpy(&ra.rfcomm_bdaddr, &addr, sizeof(ra.rfcomm_bdaddr));
 280                 ra.rfcomm_channel = channel;
 281
 282                 if (connect(s, (struct sockaddr *) &ra, sizeof(ra)) < 0)
 283                         err(1, "Could not connect socket");
 284         }
 285
 286         /* Became daemon if required */
 287         if (background && daemon(0, 0) < 0)
 288                 err(1, "Could not daemon()");
 289
 290         openlog(SPPD_IDENT, LOG_NDELAY|LOG_PERROR|LOG_PID, LOG_DAEMON);
 291         syslog(LOG_INFO, "Starting on %s...", (tty != NULL)? tty : "stdin/stdout");
 292
 293         /* Print used tty on stdout for wrappers to pick up */
 294         if (!background)
 295                 fprintf(stdout, "%s\n", tty);
 296
 297         for (done = 0; !done; ) {
 298                 FD_ZERO(&rfd);
 299                 FD_SET(amaster, &rfd);
 300                 FD_SET(s, &rfd);
 301
 302                 n = select(max(amaster, s) + 1, &rfd, NULL, NULL, NULL);
 303                 if (n < 0) {
 304                         if (errno == EINTR)
 305                                 continue;
 306
 307                         syslog(LOG_ERR, "Could not select(). %s",
 308                                         strerror(errno));
 309                         exit(1);
 310                 }
 311
 312                 if (n == 0)
 313                         continue;
 314
 315                 if (FD_ISSET(amaster, &rfd)) {
 316                         n = sppd_read(amaster, buf, sizeof(buf));
 317                         if (n < 0) {
 318                                 syslog(LOG_ERR, "Could not read master pty, " \
 319                                         "fd=%d. %s", amaster, strerror(errno));
 320                                 exit(1);
 321                         }
 322
 323                         if (n == 0)
 324                                 break; /* XXX */
 325
 326                         if (sppd_write(s, buf, n) < 0) {
 327                                 syslog(LOG_ERR, "Could not write to socket, " \
 328                                         "fd=%d, size=%d. %s",
 329                                         s, n, strerror(errno));
 330                                 exit(1);
 331                         }
 332                 }
 333
 334                 if (FD_ISSET(s, &rfd)) {
 335                         n = sppd_read(s, buf, sizeof(buf));
 336                         if (n < 0) {
 337                                 syslog(LOG_ERR, "Could not read socket, " \
 338                                         "fd=%d. %s", s, strerror(errno));
 339                                 exit(1);
 340                         }
 341
 342                         if (n == 0)
 343                                 break;
 344
 345                         if (sppd_write(fd, buf, n) < 0) {
 346                                 syslog(LOG_ERR, "Could not write to master " \
 347                                         "pty, fd=%d, size=%d. %s",
 348                                         fd, n, strerror(errno));
 349                                 exit(1);
 350                         }
 351                 }
 352         }
 353
 354         syslog(LOG_INFO, "Completed on %s", (tty != NULL)? tty : "stdin/stdout");
 355         closelog();
 356
 357         close(s);
 358
 359         if (tty != NULL) {
 360                 close(aslave);
 361                 close(amaster);
 362         }
 363
 364         return (0);
 365 }
 366
 367 /* Open TTYs */
 368 static int
 369 sppd_ttys_open(char **tty, int *amaster, int *aslave)
 370 {
 371         char             pty[PATH_MAX];
 372         struct termios   tio;
 373
 374         cfmakeraw(&tio);
 375
 376         if (openpty(amaster, aslave, pty, &tio, NULL) == -1) {
 377                 syslog(LOG_ERR, "Could not openpty(). %s", strerror(errno));
 378                 return (-1);
 379         }
 380
 381         if ((*tty = strdup(pty)) == NULL) {
 382                 syslog(LOG_ERR, "Could not strdup(). %s", strerror(errno));
 383                 close(*aslave);
 384                 close(*amaster);
 385                 return (-1);
 386         }
 387
 388         return (0);
 389 } /* sppd_ttys_open */
 390
 391 /* Read data */
 392 static int
 393 sppd_read(int fd, char *buffer, int size)
 394 {
 395         int     n;
 396
 397 again:
 398         n = read(fd, buffer, size);
 399         if (n < 0) {
 400                 if (errno == EINTR)
 401                         goto again;
 402
 403                 return (-1);
 404         }
 405
 406         return (n);
 407 } /* sppd_read */
 408
 409 /* Write data */
 410 static int
 411 sppd_write(int fd, char *buffer, int size)
 412 {
 413         int     n, wrote;
 414
 415         for (wrote = 0; size > 0; ) {
 416                 n = write(fd, buffer, size);
 417                 switch (n) {
 418                 case -1:
 419                         if (errno != EINTR)
 420                                 return (-1);
 421                         break;
 422
 423                 case 0:
 424                         /* XXX can happen? */
 425                         break;
 426
 427                 default:
 428                         wrote += n;
 429                         buffer += n;
 430                         size -= n;
 431                         break;
 432                 }
 433         }
 434
 435         return (wrote);
 436 } /* sppd_write */
 437
 438 /* Signal handler */
 439 static void
 440 sppd_sighandler(int s)
 441 {
 442         syslog(LOG_INFO, "Signal %d received. Total %d signals received\n",
 443                         s, ++ done);
 444 } /* sppd_sighandler */
 445
 446 /* Display usage and exit */
 447 static void
 448 usage(void)
 449 {
 450         fprintf(stdout,
 451 "Usage: %s options\n" \
 452 "Where options are:\n" \
 453 "\t-a address Peer address (required in client mode)\n" \
 454 "\t-b         Run in background\n" \
 455 "\t-c channel RFCOMM channel to connect to or listen on\n" \
 456 "\t-t         use slave pseudo tty (required in background mode)\n" \
 457 "\t-S         Server mode\n" \
 458 "\t-h         Display this message\n", SPPD_IDENT);
 459         exit(255);
 460 } /* usage */
 461