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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
* Copyright (C) 2002-2010 Marcel Holtmann <marcel@holtmann.org>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <syslog.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>
#include "dund.h"
#include "lib.h"
#define PROC_BASE "/proc"
static int for_each_port(int (*func)(struct rfcomm_dev_info *, unsigned long), unsigned long arg)
{
struct rfcomm_dev_list_req *dl;
struct rfcomm_dev_info *di;
long r = 0;
int sk, i;
sk = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_RFCOMM);
if (sk < 0 ) {
perror("Can't open RFCOMM control socket");
exit(1);
}
dl = malloc(sizeof(*dl) + RFCOMM_MAX_DEV * sizeof(*di));
if (!dl) {
perror("Can't allocate request memory");
close(sk);
exit(1);
}
dl->dev_num = RFCOMM_MAX_DEV;
di = dl->dev_info;
if (ioctl(sk, RFCOMMGETDEVLIST, (void *) dl) < 0) {
perror("Can't get device list");
exit(1);
}
for (i = 0; i < dl->dev_num; i++) {
r = func(di + i, arg);
if (r) break;
}
close(sk);
free(dl);
return r;
}
static int uses_rfcomm(char *path, char *dev)
{
struct dirent *de;
DIR *dir;
dir = opendir(path);
if (!dir)
return 0;
if (chdir(path) < 0)
return 0;
while ((de = readdir(dir)) != NULL) {
char link[PATH_MAX + 1];
int len = readlink(de->d_name, link, sizeof(link));
if (len > 0) {
link[len] = 0;
if (strstr(link, dev)) {
closedir(dir);
return 1;
}
}
}
closedir(dir);
return 0;
}
static int find_pppd(int id, pid_t *pid)
{
struct dirent *de;
char path[PATH_MAX + 1];
char dev[10];
int empty = 1;
DIR *dir;
dir = opendir(PROC_BASE);
if (!dir) {
perror(PROC_BASE);
return -1;
}
sprintf(dev, "rfcomm%d", id);
*pid = 0;
while ((de = readdir(dir)) != NULL) {
empty = 0;
if (isdigit(de->d_name[0])) {
sprintf(path, "%s/%s/fd", PROC_BASE, de->d_name);
if (uses_rfcomm(path, dev)) {
*pid = atoi(de->d_name);
break;
}
}
}
closedir(dir);
if (empty)
fprintf(stderr, "%s is empty (not mounted ?)\n", PROC_BASE);
return *pid != 0;
}
static int dun_exec(char *tty, char *prog, char **args)
{
int pid = fork();
int fd;
switch (pid) {
case -1:
return -1;
case 0:
break;
default:
return pid;
}
setsid();
/* Close all FDs */
for (fd = 3; fd < 20; fd++)
close(fd);
execvp(prog, args);
syslog(LOG_ERR, "Error while executing %s", prog);
exit(1);
}
static int dun_create_tty(int sk, char *tty, int size)
{
struct sockaddr_rc sa;
struct stat st;
socklen_t alen;
int id, try = 30;
struct rfcomm_dev_req req = {
flags: (1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP),
dev_id: -1
};
alen = sizeof(sa);
if (getpeername(sk, (struct sockaddr *) &sa, &alen) < 0)
return -1;
bacpy(&req.dst, &sa.rc_bdaddr);
alen = sizeof(sa);
if (getsockname(sk, (struct sockaddr *) &sa, &alen) < 0)
return -1;
bacpy(&req.src, &sa.rc_bdaddr);
req.channel = sa.rc_channel;
id = ioctl(sk, RFCOMMCREATEDEV, &req);
if (id < 0)
return id;
snprintf(tty, size, "/dev/rfcomm%d", id);
while (stat(tty, &st) < 0) {
snprintf(tty, size, "/dev/bluetooth/rfcomm/%d", id);
if (stat(tty, &st) < 0) {
snprintf(tty, size, "/dev/rfcomm%d", id);
if (try--) {
usleep(100 * 1000);
continue;
}
memset(&req, 0, sizeof(req));
req.dev_id = id;
ioctl(sk, RFCOMMRELEASEDEV, &req);
return -1;
}
}
return id;
}
int dun_init(void)
{
return 0;
}
int dun_cleanup(void)
{
return 0;
}
static int show_conn(struct rfcomm_dev_info *di, unsigned long arg)
{
pid_t pid;
if (di->state == BT_CONNECTED &&
(di->flags & (1<<RFCOMM_REUSE_DLC)) &&
(di->flags & (1<<RFCOMM_TTY_ATTACHED)) &&
(di->flags & (1<<RFCOMM_RELEASE_ONHUP))) {
if (find_pppd(di->id, &pid)) {
char dst[18];
ba2str(&di->dst, dst);
printf("rfcomm%d: %s channel %d pppd pid %d\n",
di->id, dst, di->channel, pid);
}
}
return 0;
}
static int kill_conn(struct rfcomm_dev_info *di, unsigned long arg)
{
bdaddr_t *dst = (bdaddr_t *) arg;
pid_t pid;
if (di->state == BT_CONNECTED &&
(di->flags & (1<<RFCOMM_REUSE_DLC)) &&
(di->flags & (1<<RFCOMM_TTY_ATTACHED)) &&
(di->flags & (1<<RFCOMM_RELEASE_ONHUP))) {
if (dst && bacmp(&di->dst, dst))
return 0;
if (find_pppd(di->id, &pid)) {
if (kill(pid, SIGINT) < 0)
perror("Kill");
if (!dst)
return 0;
return 1;
}
}
return 0;
}
int dun_show_connections(void)
{
for_each_port(show_conn, 0);
return 0;
}
int dun_kill_connection(uint8_t *dst)
{
for_each_port(kill_conn, (unsigned long) dst);
return 0;
}
int dun_kill_all_connections(void)
{
for_each_port(kill_conn, 0);
return 0;
}
int dun_open_connection(int sk, char *pppd, char **args, int wait)
{
char tty[100];
int pid;
if (dun_create_tty(sk, tty, sizeof(tty) - 1) < 0) {
syslog(LOG_ERR, "RFCOMM TTY creation failed. %s(%d)", strerror(errno), errno);
return -1;
}
args[0] = "pppd";
args[1] = tty;
args[2] = "nodetach";
pid = dun_exec(tty, pppd, args);
if (pid < 0) {
syslog(LOG_ERR, "Exec failed. %s(%d)", strerror(errno), errno);
return -1;
}
if (wait) {
int status;
waitpid(pid, &status, 0);
/* FIXME: Check for waitpid errors */
}
return 0;
}
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