403 lines
8.9 KiB
C
403 lines
8.9 KiB
C
/*
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* rfcomm_sppd.c
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*
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* Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: rfcomm_sppd.c,v 1.4 2003/09/07 18:15:55 max Exp $
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* $FreeBSD$
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*/
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#include <sys/stat.h>
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#include <bluetooth.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <limits.h>
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#include <paths.h>
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#include <sdp.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <termios.h>
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#include <unistd.h>
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#define SPPD_IDENT "rfcomm_sppd"
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#define SPPD_BUFFER_SIZE 1024
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#define max(a, b) (((a) > (b))? (a) : (b))
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int rfcomm_channel_lookup (bdaddr_t const *local,
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bdaddr_t const *remote,
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int service, int *channel, int *error);
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static int sppd_ttys_open (char const *tty, int *amaster, int *aslave);
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static int sppd_read (int fd, char *buffer, int size);
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static int sppd_write (int fd, char *buffer, int size);
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static void sppd_sighandler (int s);
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static void usage (void);
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static int done; /* are we done? */
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/* Main */
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int
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main(int argc, char *argv[])
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{
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struct sigaction sa;
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struct sockaddr_rfcomm ra;
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bdaddr_t addr;
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int n, background, channel, s, amaster, aslave;
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fd_set rfd;
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char *tty = NULL, buf[SPPD_BUFFER_SIZE];
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memcpy(&addr, NG_HCI_BDADDR_ANY, sizeof(addr));
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background = channel = 0;
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/* Parse command line options */
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while ((n = getopt(argc, argv, "a:bc:t:h")) != -1) {
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switch (n) {
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case 'a': /* BDADDR */
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if (!bt_aton(optarg, &addr)) {
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struct hostent *he = NULL;
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if ((he = bt_gethostbyname(optarg)) == NULL)
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errx(1, "%s: %s", optarg, hstrerror(h_errno));
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memcpy(&addr, he->h_addr, sizeof(addr));
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}
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break;
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case 'c': /* RFCOMM channel */
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channel = atoi(optarg);
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break;
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case 'b': /* Run in background */
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background = 1;
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break;
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case 't': /* Slave TTY name */
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if (optarg[0] != '/')
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asprintf(&tty, "%s%s", _PATH_DEV, optarg);
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else
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tty = optarg;
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break;
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case 'h':
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default:
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usage();
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/* NOT REACHED */
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}
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}
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/* Check if we have everything we need */
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if (tty == NULL || memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) == 0)
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usage();
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/* NOT REACHED */
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/* Set signal handlers */
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = sppd_sighandler;
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if (sigaction(SIGTERM, &sa, NULL) < 0)
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err(1, "Could not sigaction(SIGTERM)");
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if (sigaction(SIGHUP, &sa, NULL) < 0)
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err(1, "Could not sigaction(SIGHUP)");
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if (sigaction(SIGINT, &sa, NULL) < 0)
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err(1, "Could not sigaction(SIGINT)");
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = SA_NOCLDWAIT;
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if (sigaction(SIGCHLD, &sa, NULL) < 0)
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err(1, "Could not sigaction(SIGCHLD)");
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/* Check channel, if was not set then obtain it via SDP */
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if (channel == 0)
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if (rfcomm_channel_lookup(NULL, &addr,
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SDP_SERVICE_CLASS_SERIAL_PORT, &channel, &n) != 0)
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errc(1, n, "Could not obtain RFCOMM channel");
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if (channel <= 0 || channel > 30)
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errx(1, "Invalid RFCOMM channel number %d", channel);
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/* Open TTYs */
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if (sppd_ttys_open(tty, &amaster, &aslave) < 0)
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exit(1);
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/* Open RFCOMM connection */
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memset(&ra, 0, sizeof(ra));
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ra.rfcomm_len = sizeof(ra);
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ra.rfcomm_family = AF_BLUETOOTH;
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s = socket(PF_BLUETOOTH, SOCK_STREAM, BLUETOOTH_PROTO_RFCOMM);
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if (s < 0)
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err(1, "Could not create socket");
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if (bind(s, (struct sockaddr *) &ra, sizeof(ra)) < 0)
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err(1, "Could not bind socket");
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memcpy(&ra.rfcomm_bdaddr, &addr, sizeof(ra.rfcomm_bdaddr));
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ra.rfcomm_channel = channel;
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if (connect(s, (struct sockaddr *) &ra, sizeof(ra)) < 0)
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err(1, "Could not connect socket");
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/* Became daemon if required */
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if (background) {
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switch (fork()) {
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case -1:
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err(1, "Could not fork()");
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/* NOT REACHED */
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case 0:
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exit(0);
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/* NOT REACHED */
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default:
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if (daemon(0, 0) < 0)
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err(1, "Could not daemon()");
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break;
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}
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}
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openlog(SPPD_IDENT, LOG_NDELAY|LOG_PERROR|LOG_PID, LOG_DAEMON);
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syslog(LOG_INFO, "Starting on %s...", tty);
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for (done = 0; !done; ) {
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FD_ZERO(&rfd);
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FD_SET(amaster, &rfd);
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FD_SET(s, &rfd);
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n = select(max(amaster, s) + 1, &rfd, NULL, NULL, NULL);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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syslog(LOG_ERR, "Could not select(). %s",
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strerror(errno));
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exit(1);
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}
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if (n == 0)
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continue;
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if (FD_ISSET(amaster, &rfd)) {
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n = sppd_read(amaster, buf, sizeof(buf));
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if (n < 0) {
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syslog(LOG_ERR, "Could not read master pty, " \
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"fd=%d. %s", amaster, strerror(errno));
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exit(1);
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}
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if (n == 0)
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break; /* XXX */
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if (sppd_write(s, buf, n) < 0) {
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syslog(LOG_ERR, "Could not write to socket, " \
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"fd=%d, size=%d. %s",
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s, n, strerror(errno));
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exit(1);
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}
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}
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if (FD_ISSET(s, &rfd)) {
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n = sppd_read(s, buf, sizeof(buf));
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if (n < 0) {
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syslog(LOG_ERR, "Could not read socket, " \
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"fd=%d. %s", s, strerror(errno));
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exit(1);
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}
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if (n == 0)
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break;
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if (sppd_write(amaster, buf, n) < 0) {
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syslog(LOG_ERR, "Could not write to master " \
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"pty, fd=%d, size=%d. %s",
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amaster, n, strerror(errno));
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exit(1);
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}
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}
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}
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syslog(LOG_INFO, "Completed on %s", tty);
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closelog();
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close(s);
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close(aslave);
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close(amaster);
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return (0);
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}
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/* Open TTYs */
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static int
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sppd_ttys_open(char const *tty, int *amaster, int *aslave)
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{
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char pty[PATH_MAX], *slash;
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struct group *gr = NULL;
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gid_t ttygid;
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struct termios tio;
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/*
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* Construct master PTY name. The slave tty name must be less then
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* PATH_MAX characters in length, must contain '/' character and
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* must not end with '/'.
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*/
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if (strlen(tty) >= sizeof(pty)) {
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syslog(LOG_ERR, "Slave tty name is too long");
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return (-1);
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}
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strlcpy(pty, tty, sizeof(pty));
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slash = strrchr(pty, '/');
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if (slash == NULL || slash[1] == '\0') {
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syslog(LOG_ERR, "Invalid slave tty name (%s)", tty);
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return (-1);
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}
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slash[1] = 'p';
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if (strcmp(pty, tty) == 0) {
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syslog(LOG_ERR, "Master and slave tty are the same (%s)", tty);
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return (-1);
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}
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if ((*amaster = open(pty, O_RDWR, 0)) < 0) {
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syslog(LOG_ERR, "Could not open(%s). %s", pty, strerror(errno));
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return (-1);
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}
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/*
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* Slave TTY
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*/
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if ((gr = getgrnam("tty")) != NULL)
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ttygid = gr->gr_gid;
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else
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ttygid = -1;
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(void) chown(tty, getuid(), ttygid);
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(void) chmod(tty, S_IRUSR|S_IWUSR|S_IWGRP);
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(void) revoke(tty);
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if ((*aslave = open(tty, O_RDWR, 0)) < 0) {
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syslog(LOG_ERR, "Could not open(%s). %s", tty, strerror(errno));
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close(*amaster);
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return (-1);
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}
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/*
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* Make slave TTY raw
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*/
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cfmakeraw(&tio);
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if (tcsetattr(*aslave, TCSANOW, &tio) < 0) {
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syslog(LOG_ERR, "Could not tcsetattr(). %s", strerror(errno));
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close(*aslave);
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close(*amaster);
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return (-1);
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}
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return (0);
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} /* sppd_ttys_open */
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/* Read data */
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static int
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sppd_read(int fd, char *buffer, int size)
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{
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int n;
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again:
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n = read(fd, buffer, size);
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if (n < 0) {
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if (errno == EINTR)
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goto again;
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return (-1);
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}
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return (n);
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} /* sppd_read */
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/* Write data */
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static int
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sppd_write(int fd, char *buffer, int size)
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{
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int n, wrote;
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for (wrote = 0; size > 0; ) {
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n = write(fd, buffer, size);
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switch (n) {
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case -1:
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if (errno != EINTR)
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return (-1);
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break;
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case 0:
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/* XXX can happen? */
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break;
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default:
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wrote += n;
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buffer += n;
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size -= n;
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break;
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}
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}
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return (wrote);
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} /* sppd_write */
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/* Signal handler */
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static void
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sppd_sighandler(int s)
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{
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syslog(LOG_INFO, "Signal %d received. Total %d signals received\n",
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s, ++ done);
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} /* sppd_sighandler */
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/* Display usage and exit */
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static void
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usage(void)
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{
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fprintf(stdout,
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"Usage: %s options\n" \
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"Where options are:\n" \
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"\t-a bdaddr BDADDR to connect to (required)\n" \
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"\t-b Run in background\n" \
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"\t-c channel RFCOMM channel to connect to\n" \
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"\t-t tty TTY name\n" \
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"\t-h Display this message\n", SPPD_IDENT);
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exit(255);
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} /* usage */
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