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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2014 Red Hat, Inc.
*/
#include <config.h>
#include <sys/socket.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>
#include <bluetooth/rfcomm.h>
#include <net/ethernet.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "nm-bluez5-dun.h"
#include "nm-bt-error.h"
#include "nm-logging.h"
#include "NetworkManagerUtils.h"
typedef struct _NMBluez5DunContext {
bdaddr_t src;
bdaddr_t dst;
char *src_str;
char *dst_str;
int rfcomm_channel;
int rfcomm_fd;
int rfcomm_tty_fd;
int rfcomm_id;
NMBluez5DunFunc callback;
gpointer user_data;
sdp_session_t *sdp_session;
guint sdp_watch_id;
} NMBluez5DunContext;
static void
dun_connect (NMBluez5DunContext *context)
{
struct sockaddr_rc sa;
int devid, try = 30;
char tty[100];
const int ttylen = sizeof (tty) - 1;
GError *error = NULL;
struct rfcomm_dev_req req = {
.flags = (1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP),
.dev_id = -1,
.channel = context->rfcomm_channel
};
context->rfcomm_fd = socket (AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
if (context->rfcomm_fd < 0) {
int errsv = errno;
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Failed to create RFCOMM socket: (%d) %s",
errsv, strerror (errsv));
goto done;
}
/* Connect to the remote device */
sa.rc_family = AF_BLUETOOTH;
sa.rc_channel = 0;
memcpy (&sa.rc_bdaddr, &context->src, ETH_ALEN);
if (bind (context->rfcomm_fd, (struct sockaddr *) &sa, sizeof(sa))) {
int errsv = errno;
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Failed to bind socket: (%d) %s",
errsv, strerror (errsv));
goto done;
}
sa.rc_channel = context->rfcomm_channel;
memcpy (&sa.rc_bdaddr, &context->dst, ETH_ALEN);
if (connect (context->rfcomm_fd, (struct sockaddr *) &sa, sizeof (sa)) ) {
int errsv = errno;
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Failed to connect to remote device: (%d) %s",
errsv, strerror (errsv));
goto done;
}
nm_log_dbg (LOGD_BT, "(%s): connected to %s on channel %d",
context->src_str, context->dst_str, context->rfcomm_channel);
/* Create an RFCOMM kernel device for the DUN channel */
memcpy (&req.src, &context->src, ETH_ALEN);
memcpy (&req.dst, &context->dst, ETH_ALEN);
devid = ioctl (context->rfcomm_fd, RFCOMMCREATEDEV, &req);
if (devid < 0) {
int errsv = errno;
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Failed to create rfcomm device: (%d) %s",
errsv, strerror (errsv));
goto done;
}
context->rfcomm_id = devid;
snprintf (tty, ttylen, "/dev/rfcomm%d", devid);
while ((context->rfcomm_tty_fd = open (tty, O_RDONLY | O_NOCTTY)) < 0 && try--) {
if (try) {
g_usleep (100 * 1000);
continue;
}
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Failed to find rfcomm device: %s",
tty);
break;
}
done:
context->callback (context, tty, error, context->user_data);
}
static void
sdp_search_cleanup (NMBluez5DunContext *context)
{
if (context->sdp_session) {
sdp_close (context->sdp_session);
context->sdp_session = NULL;
}
if (context->sdp_watch_id) {
g_source_remove (context->sdp_watch_id);
context->sdp_watch_id = 0;
}
}
static void
sdp_search_completed_cb (uint8_t type, uint16_t status, uint8_t *rsp, size_t size, void *user_data)
{
NMBluez5DunContext *context = user_data;
int scanned, seqlen = 0, bytesleft = size;
uint8_t dataType;
int channel = -1;
nm_log_dbg (LOGD_BT, "(%s -> %s): SDP search finished with type=%d status=%d",
context->src_str, context->dst_str, status, type);
/* SDP response received */
if (status || type != SDP_SVC_SEARCH_ATTR_RSP) {
GError *error = g_error_new (NM_BT_ERROR,
NM_BT_ERROR_DUN_CONNECT_FAILED,
"Did not get a Service Discovery response");
context->callback (context, NULL, error, context->user_data);
goto done;
}
scanned = sdp_extract_seqtype (rsp, bytesleft, &dataType, &seqlen);
nm_log_dbg (LOGD_BT, "(%s -> %s): SDP sequence type scanned=%d length=%d",
context->src_str, context->dst_str, scanned, seqlen);
scanned = sdp_extract_seqtype (rsp, bytesleft, &dataType, &seqlen);
if (!scanned || !seqlen) {
/* Short read or unknown sequence type */
GError *error = g_error_new (NM_BT_ERROR,
NM_BT_ERROR_DUN_CONNECT_FAILED,
"Improper Service Discovery response");
context->callback (context, NULL, error, context->user_data);
goto done;
}
rsp += scanned;
bytesleft -= scanned;
do {
sdp_record_t *rec;
int recsize = 0;
sdp_list_t *protos;
rec = sdp_extract_pdu (rsp, bytesleft, &recsize);
if (!rec)
break;
if (!recsize) {
sdp_record_free (rec);
break;
}
if (sdp_get_access_protos (rec, &protos) == 0) {
/* Extract the DUN channel number */
channel = sdp_get_proto_port (protos, RFCOMM_UUID);
sdp_list_free (protos, NULL);
nm_log_dbg (LOGD_BT, "(%s -> %s): SDP channel=%d",
context->src_str, context->dst_str, channel);
}
sdp_record_free (rec);
scanned += recsize;
rsp += recsize;
bytesleft -= recsize;
} while ((scanned < (ssize_t) size) && (bytesleft > 0) && (channel < 0));
done:
if (channel != -1) {
context->rfcomm_channel = channel;
dun_connect (context);
}
sdp_search_cleanup (context);
}
static gboolean
sdp_search_process_cb (GIOChannel *channel, GIOCondition condition, gpointer user_data)
{
NMBluez5DunContext *context = user_data;
nm_log_dbg (LOGD_BT, "(%s -> %s): SDP search progressed with condition=%d",
context->src_str, context->dst_str, condition);
if (condition & (G_IO_ERR | G_IO_HUP | G_IO_NVAL)) {
GError *error = g_error_new (NM_BT_ERROR,
NM_BT_ERROR_DUN_CONNECT_FAILED,
"Service Discovery interrupted");
context->callback (context, NULL, error, context->user_data);
sdp_search_cleanup (context);
return FALSE;
}
if (sdp_process (context->sdp_session) < 0) {
nm_log_dbg (LOGD_BT, "(%s -> %s): SDP search finished",
context->src_str, context->dst_str);
/* Search finished successfully. */
return FALSE;
}
/* Search progressed successfully. */
return TRUE;
}
static gboolean
sdp_connect_watch (GIOChannel *channel, GIOCondition condition, gpointer user_data)
{
NMBluez5DunContext *context = user_data;
sdp_list_t *search, *attrs;
uuid_t svclass;
uint16_t attr;
int fd, err, fd_err = 0;
socklen_t len = sizeof (fd_err);
GError *error = NULL;
context->sdp_watch_id = 0;
fd = g_io_channel_unix_get_fd (channel);
if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &fd_err, &len) < 0) {
nm_log_dbg (LOGD_BT, "(%s -> %s): getsockopt error=%d",
context->src_str, context->dst_str, errno);
err = errno;
} else {
nm_log_dbg (LOGD_BT, "(%s -> %s): SO_ERROR error=%d",
context->src_str, context->dst_str, fd_err);
err = fd_err;
}
if (err != 0) {
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Error on Service Discovery socket: (%d) %s",
err, strerror (err));
goto done;
}
if (sdp_set_notify (context->sdp_session, sdp_search_completed_cb, context) < 0) {
/* Should not be reached, only can fail if we passed bad sdp_session. */
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Could not request Service Discovery notification");
goto done;
}
sdp_uuid16_create (&svclass, DIALUP_NET_SVCLASS_ID);
search = sdp_list_append (NULL, &svclass);
attr = SDP_ATTR_PROTO_DESC_LIST;
attrs = sdp_list_append (NULL, &attr);
if (!sdp_service_search_attr_async (context->sdp_session, search, SDP_ATTR_REQ_INDIVIDUAL, attrs)) {
/* Set callback responsible for update the internal SDP transaction */
context->sdp_watch_id = g_io_add_watch (channel,
G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
sdp_search_process_cb,
context);
} else {
err = sdp_get_error (context->sdp_session);
error = g_error_new (NM_BT_ERROR,
NM_BT_ERROR_DUN_CONNECT_FAILED,
"Error starting Service Discovery: (%d) %s",
err, strerror (err));
}
sdp_list_free (attrs, NULL);
sdp_list_free (search, NULL);
done:
if (error) {
context->callback (context, NULL, error, context->user_data);
sdp_search_cleanup (context);
}
return G_SOURCE_REMOVE;
}
NMBluez5DunContext *
nm_bluez5_dun_new (const char *adapter,
const char *remote)
{
NMBluez5DunContext *context;
context = g_slice_new0 (NMBluez5DunContext);
str2ba (adapter, &context->src);
str2ba (remote, &context->dst);
context->src_str = g_strdup (adapter);
context->dst_str = g_strdup (remote);
context->rfcomm_channel = -1;
context->rfcomm_id = -1;
context->rfcomm_fd = -1;
return context;
}
void
nm_bluez5_dun_connect (NMBluez5DunContext *context,
NMBluez5DunFunc callback,
gpointer user_data)
{
GIOChannel *channel;
context->callback = callback;
context->user_data = user_data;
if (context->rfcomm_channel != -1) {
nm_log_dbg (LOGD_BT, "(%s): channel number on device %s cached: %d",
context->src_str, context->dst_str, context->rfcomm_channel);
dun_connect (context);
return;
}
nm_log_dbg (LOGD_BT, "(%s): starting channel number discovery for device %s",
context->src_str, context->dst_str);
context->sdp_session = sdp_connect (&context->src, &context->dst, SDP_NON_BLOCKING);
if (!context->sdp_session) {
GError *error;
int err = sdp_get_error (context->sdp_session);
error = g_error_new (NM_BT_ERROR, NM_BT_ERROR_DUN_CONNECT_FAILED,
"Failed to connect to the SDP server: (%d) %s",
err, strerror (err));
context->callback (context, NULL, error, context->user_data);
return;
}
channel = g_io_channel_unix_new (sdp_get_socket (context->sdp_session));
context->sdp_watch_id = g_io_add_watch (channel,
G_IO_OUT | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
sdp_connect_watch,
context);
g_io_channel_unref (channel);
}
/* Only clean up connection-related stuff to allow reconnect */
void
nm_bluez5_dun_cleanup (NMBluez5DunContext *context)
{
g_return_if_fail (context != NULL);
sdp_search_cleanup (context);
if (context->rfcomm_fd >= 0) {
if (context->rfcomm_id >= 0) {
struct rfcomm_dev_req req = { 0 };
req.dev_id = context->rfcomm_id;
ioctl (context->rfcomm_fd, RFCOMMRELEASEDEV, &req);
context->rfcomm_id = -1;
}
close (context->rfcomm_fd);
context->rfcomm_fd = -1;
}
close (context->rfcomm_tty_fd);
context->rfcomm_tty_fd = -1;
}
void
nm_bluez5_dun_free (NMBluez5DunContext *context)
{
g_return_if_fail (context != NULL);
nm_bluez5_dun_cleanup (context);
g_clear_pointer (&context->src_str, g_free);
g_clear_pointer (&context->dst_str, g_free);
g_slice_free (NMBluez5DunContext, context);
}
|