FreeBSD-5.3/usr.bin/bluetooth/rfcomm_sppd/rfcomm_sppd.c
/*
* rfcomm_sppd.c
*
* Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: rfcomm_sppd.c,v 1.4 2003/09/07 18:15:55 max Exp $
* $FreeBSD: src/usr.bin/bluetooth/rfcomm_sppd/rfcomm_sppd.c,v 1.5.2.1 2004/10/03 16:14:43 emax Exp $
*/
#include <sys/stat.h>
#include <bluetooth.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <limits.h>
#include <paths.h>
#include <sdp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <unistd.h>
#define SPPD_IDENT "rfcomm_sppd"
#define SPPD_BUFFER_SIZE 1024
#define max(a, b) (((a) > (b))? (a) : (b))
int rfcomm_channel_lookup (bdaddr_t const *local,
bdaddr_t const *remote,
int service, int *channel, int *error);
static int sppd_ttys_open (char const *tty, int *amaster, int *aslave);
static int sppd_read (int fd, char *buffer, int size);
static int sppd_write (int fd, char *buffer, int size);
static void sppd_sighandler (int s);
static void usage (void);
static int done; /* are we done? */
/* Main */
int
main(int argc, char *argv[])
{
struct sigaction sa;
struct sockaddr_rfcomm ra;
bdaddr_t addr;
int n, background, channel, s, amaster, aslave, fd;
fd_set rfd;
char *tty = NULL, buf[SPPD_BUFFER_SIZE];
memcpy(&addr, NG_HCI_BDADDR_ANY, sizeof(addr));
background = channel = 0;
/* Parse command line options */
while ((n = getopt(argc, argv, "a:bc:t:h")) != -1) {
switch (n) {
case 'a': /* BDADDR */
if (!bt_aton(optarg, &addr)) {
struct hostent *he = NULL;
if ((he = bt_gethostbyname(optarg)) == NULL)
errx(1, "%s: %s", optarg, hstrerror(h_errno));
memcpy(&addr, he->h_addr, sizeof(addr));
}
break;
case 'c': /* RFCOMM channel */
channel = atoi(optarg);
break;
case 'b': /* Run in background */
background = 1;
break;
case 't': /* Slave TTY name */
if (optarg[0] != '/')
asprintf(&tty, "%s%s", _PATH_DEV, optarg);
else
tty = optarg;
break;
case 'h':
default:
usage();
/* NOT REACHED */
}
}
/* Check if we have everything we need */
if (memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) == 0)
usage();
/* NOT REACHED */
/* Set signal handlers */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sppd_sighandler;
if (sigaction(SIGTERM, &sa, NULL) < 0)
err(1, "Could not sigaction(SIGTERM)");
if (sigaction(SIGHUP, &sa, NULL) < 0)
err(1, "Could not sigaction(SIGHUP)");
if (sigaction(SIGINT, &sa, NULL) < 0)
err(1, "Could not sigaction(SIGINT)");
sa.sa_handler = SIG_IGN;
sa.sa_flags = SA_NOCLDWAIT;
if (sigaction(SIGCHLD, &sa, NULL) < 0)
err(1, "Could not sigaction(SIGCHLD)");
/* Check channel, if was not set then obtain it via SDP */
if (channel == 0)
if (rfcomm_channel_lookup(NULL, &addr,
SDP_SERVICE_CLASS_SERIAL_PORT, &channel, &n) != 0)
errc(1, n, "Could not obtain RFCOMM channel");
if (channel <= 0 || channel > 30)
errx(1, "Invalid RFCOMM channel number %d", channel);
/* Open TTYs */
if (tty == NULL) {
if (background)
usage();
amaster = STDIN_FILENO;
fd = STDOUT_FILENO;
} else {
if (sppd_ttys_open(tty, &amaster, &aslave) < 0)
exit(1);
fd = amaster;
}
/* Open RFCOMM connection */
memset(&ra, 0, sizeof(ra));
ra.rfcomm_len = sizeof(ra);
ra.rfcomm_family = AF_BLUETOOTH;
s = socket(PF_BLUETOOTH, SOCK_STREAM, BLUETOOTH_PROTO_RFCOMM);
if (s < 0)
err(1, "Could not create socket");
if (bind(s, (struct sockaddr *) &ra, sizeof(ra)) < 0)
err(1, "Could not bind socket");
memcpy(&ra.rfcomm_bdaddr, &addr, sizeof(ra.rfcomm_bdaddr));
ra.rfcomm_channel = channel;
if (connect(s, (struct sockaddr *) &ra, sizeof(ra)) < 0)
err(1, "Could not connect socket");
/* Became daemon if required */
if (background) {
switch (fork()) {
case -1:
err(1, "Could not fork()");
/* NOT REACHED */
case 0:
exit(0);
/* NOT REACHED */
default:
if (daemon(0, 0) < 0)
err(1, "Could not daemon()");
break;
}
}
openlog(SPPD_IDENT, LOG_NDELAY|LOG_PERROR|LOG_PID, LOG_DAEMON);
syslog(LOG_INFO, "Starting on %s...", (tty != NULL)? tty : "stdin/stdout");
for (done = 0; !done; ) {
FD_ZERO(&rfd);
FD_SET(amaster, &rfd);
FD_SET(s, &rfd);
n = select(max(amaster, s) + 1, &rfd, NULL, NULL, NULL);
if (n < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "Could not select(). %s",
strerror(errno));
exit(1);
}
if (n == 0)
continue;
if (FD_ISSET(amaster, &rfd)) {
n = sppd_read(amaster, buf, sizeof(buf));
if (n < 0) {
syslog(LOG_ERR, "Could not read master pty, " \
"fd=%d. %s", amaster, strerror(errno));
exit(1);
}
if (n == 0)
break; /* XXX */
if (sppd_write(s, buf, n) < 0) {
syslog(LOG_ERR, "Could not write to socket, " \
"fd=%d, size=%d. %s",
s, n, strerror(errno));
exit(1);
}
}
if (FD_ISSET(s, &rfd)) {
n = sppd_read(s, buf, sizeof(buf));
if (n < 0) {
syslog(LOG_ERR, "Could not read socket, " \
"fd=%d. %s", s, strerror(errno));
exit(1);
}
if (n == 0)
break;
if (sppd_write(fd, buf, n) < 0) {
syslog(LOG_ERR, "Could not write to master " \
"pty, fd=%d, size=%d. %s",
fd, n, strerror(errno));
exit(1);
}
}
}
syslog(LOG_INFO, "Completed on %s", (tty != NULL)? tty : "stdin/stdout");
closelog();
close(s);
if (tty != NULL) {
close(aslave);
close(amaster);
}
return (0);
}
/* Open TTYs */
static int
sppd_ttys_open(char const *tty, int *amaster, int *aslave)
{
char pty[PATH_MAX], *slash;
struct group *gr = NULL;
gid_t ttygid;
struct termios tio;
/*
* Construct master PTY name. The slave tty name must be less then
* PATH_MAX characters in length, must contain '/' character and
* must not end with '/'.
*/
if (strlen(tty) >= sizeof(pty)) {
syslog(LOG_ERR, "Slave tty name is too long");
return (-1);
}
strlcpy(pty, tty, sizeof(pty));
slash = strrchr(pty, '/');
if (slash == NULL || slash[1] == '\0') {
syslog(LOG_ERR, "Invalid slave tty name (%s)", tty);
return (-1);
}
slash[1] = 'p';
if (strcmp(pty, tty) == 0) {
syslog(LOG_ERR, "Master and slave tty are the same (%s)", tty);
return (-1);
}
if ((*amaster = open(pty, O_RDWR, 0)) < 0) {
syslog(LOG_ERR, "Could not open(%s). %s", pty, strerror(errno));
return (-1);
}
/*
* Slave TTY
*/
if ((gr = getgrnam("tty")) != NULL)
ttygid = gr->gr_gid;
else
ttygid = -1;
(void) chown(tty, getuid(), ttygid);
(void) chmod(tty, S_IRUSR|S_IWUSR|S_IWGRP);
(void) revoke(tty);
if ((*aslave = open(tty, O_RDWR, 0)) < 0) {
syslog(LOG_ERR, "Could not open(%s). %s", tty, strerror(errno));
close(*amaster);
return (-1);
}
/*
* Make slave TTY raw
*/
cfmakeraw(&tio);
if (tcsetattr(*aslave, TCSANOW, &tio) < 0) {
syslog(LOG_ERR, "Could not tcsetattr(). %s", strerror(errno));
close(*aslave);
close(*amaster);
return (-1);
}
return (0);
} /* sppd_ttys_open */
/* Read data */
static int
sppd_read(int fd, char *buffer, int size)
{
int n;
again:
n = read(fd, buffer, size);
if (n < 0) {
if (errno == EINTR)
goto again;
return (-1);
}
return (n);
} /* sppd_read */
/* Write data */
static int
sppd_write(int fd, char *buffer, int size)
{
int n, wrote;
for (wrote = 0; size > 0; ) {
n = write(fd, buffer, size);
switch (n) {
case -1:
if (errno != EINTR)
return (-1);
break;
case 0:
/* XXX can happen? */
break;
default:
wrote += n;
buffer += n;
size -= n;
break;
}
}
return (wrote);
} /* sppd_write */
/* Signal handler */
static void
sppd_sighandler(int s)
{
syslog(LOG_INFO, "Signal %d received. Total %d signals received\n",
s, ++ done);
} /* sppd_sighandler */
/* Display usage and exit */
static void
usage(void)
{
fprintf(stdout,
"Usage: %s options\n" \
"Where options are:\n" \
"\t-a address Address to connect to (required)\n" \
"\t-b Run in background\n" \
"\t-c channel RFCOMM channel to connect to\n" \
"\t-t tty TTY name (required in background mode)\n" \
"\t-h Display this message\n", SPPD_IDENT);
exit(255);
} /* usage */