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* BlueZ - Bluetooth protocol stack for Linux
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2002-2010 Marcel Holtmann <marcel@holtmann.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <bluetooth/bluetooth.h>
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#include <bluetooth/rfcomm.h>
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#define PROC_BASE "/proc"
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static int for_each_port(int (*func)(struct rfcomm_dev_info *, unsigned long), unsigned long arg)
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struct rfcomm_dev_list_req *dl;
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struct rfcomm_dev_info *di;
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sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_RFCOMM);
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perror("Can't open RFCOMM control socket");
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dl = malloc(sizeof(*dl) + RFCOMM_MAX_DEV * sizeof(*di));
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perror("Can't allocate request memory");
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dl->dev_num = RFCOMM_MAX_DEV;
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if (ioctl(sk, RFCOMMGETDEVLIST, (void *) dl) < 0) {
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perror("Can't get device list");
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for (i = 0; i < dl->dev_num; i++) {
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r = func(di + i, arg);
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static int uses_rfcomm(char *path, char *dev)
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while ((de = readdir(dir)) != NULL) {
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char link[PATH_MAX + 1];
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int len = readlink(de->d_name, link, PATH_MAX);
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if (strstr(link, dev)) {
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static int find_pppd(int id, pid_t *pid)
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char path[PATH_MAX + 1];
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dir = opendir(PROC_BASE);
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sprintf(dev, "rfcomm%d", id);
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while ((de = readdir(dir)) != NULL) {
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if (isdigit(de->d_name[0])) {
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sprintf(path, "%s/%s/fd", PROC_BASE, de->d_name);
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if (uses_rfcomm(path, dev)) {
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*pid = atoi(de->d_name);
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fprintf(stderr, "%s is empty (not mounted ?)\n", PROC_BASE);
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static int dun_exec(char *tty, char *prog, char **args)
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for (fd = 3; fd < 20; fd++)
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syslog(LOG_ERR, "Error while executing %s", prog);
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static int dun_create_tty(int sk, char *tty, int size)
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struct sockaddr_rc sa;
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struct rfcomm_dev_req req = {
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.flags = (1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP),
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if (getpeername(sk, (struct sockaddr *) &sa, &alen) < 0)
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bacpy(&req.dst, &sa.rc_bdaddr);
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if (getsockname(sk, (struct sockaddr *) &sa, &alen) < 0)
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bacpy(&req.src, &sa.rc_bdaddr);
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req.channel = sa.rc_channel;
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id = ioctl(sk, RFCOMMCREATEDEV, &req);
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snprintf(tty, size, "/dev/rfcomm%d", id);
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while (stat(tty, &st) < 0) {
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snprintf(tty, size, "/dev/bluetooth/rfcomm/%d", id);
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if (stat(tty, &st) < 0) {
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snprintf(tty, size, "/dev/rfcomm%d", id);
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memset(&req, 0, sizeof(req));
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ioctl(sk, RFCOMMRELEASEDEV, &req);
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int dun_cleanup(void)
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static int show_conn(struct rfcomm_dev_info *di, unsigned long arg)
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if (di->state == BT_CONNECTED &&
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(di->flags & (1<<RFCOMM_REUSE_DLC)) &&
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(di->flags & (1<<RFCOMM_TTY_ATTACHED)) &&
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(di->flags & (1<<RFCOMM_RELEASE_ONHUP))) {
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if (find_pppd(di->id, &pid)) {
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ba2str(&di->dst, dst);
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printf("rfcomm%d: %s channel %d pppd pid %d\n",
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di->id, dst, di->channel, pid);
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static int kill_conn(struct rfcomm_dev_info *di, unsigned long arg)
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bdaddr_t *dst = (bdaddr_t *) arg;
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if (di->state == BT_CONNECTED &&
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(di->flags & (1<<RFCOMM_REUSE_DLC)) &&
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(di->flags & (1<<RFCOMM_TTY_ATTACHED)) &&
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(di->flags & (1<<RFCOMM_RELEASE_ONHUP))) {
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if (dst && bacmp(&di->dst, dst))
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if (find_pppd(di->id, &pid)) {
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if (kill(pid, SIGINT) < 0)
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int dun_show_connections(void)
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for_each_port(show_conn, 0);
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int dun_kill_connection(uint8_t *dst)
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for_each_port(kill_conn, (unsigned long) dst);
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int dun_kill_all_connections(void)
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for_each_port(kill_conn, 0);
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int dun_open_connection(int sk, char *pppd, char **args, int wait)
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if (dun_create_tty(sk, tty, sizeof(tty) - 1) < 0) {
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syslog(LOG_ERR, "RFCOMM TTY creation failed. %s(%d)", strerror(errno), errno);
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args[2] = "nodetach";
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pid = dun_exec(tty, pppd, args);
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syslog(LOG_ERR, "Exec failed. %s(%d)", strerror(errno), errno);
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waitpid(pid, &status, 0);
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/* FIXME: Check for waitpid errors */