server.c

基于LINUX内核驱动的开发

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2008  Marcel Holtmann <[e-mail]>
 *
 *
 *  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 <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <net/if.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/bnep.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>

#include <netinet/in.h>

#include <glib.h>

#include "logging.h"
#include "dbus.h"
#include "error.h"
#include "textfile.h"
#include "dbus-helper.h"

#define NETWORK_SERVER_INTERFACE "org.bluez.network.Server"
#define SETUP_TIMEOUT		1000
#define MAX_SETUP_ATTEMPTS	3

#include "bridge.h"
#include "common.h"
#include "manager.h"

/* Pending Authorization */
struct setup_session {
	char		*address;	/* Remote Bluetooth Address */
	uint16_t	dst_role;	/* Destination role */
	uint16_t	src_role;	/* Source role */
	int		nsk;		/* L2CAP socket */
	int		attempts;	/* Setup msg received */
	guint		watch;		/* BNEP setup watch */
	guint		timeout;	/* Max setup time */
};

/* Main server structure */
struct network_server {
	bdaddr_t	src;		/* Bluetooth Local Address */
	char		*iface;		/* Routing interface */
	char		*name;		/* Server service name */
	char		*range;		/* IP Address range */
	char		*path;		/* D-Bus path */
	gboolean	enable;		/* Enable flag */
	uint32_t	record_id;	/* Service record id */
	uint16_t	id;		/* Service class identifier */
	GSList		*clients;	/* Active connections */
};

static GIOChannel *bnep_io = NULL;
static DBusConnection *connection = NULL;
static GSList *setup_sessions = NULL;
static const char *prefix = NULL;
static gboolean security = TRUE;

static int store_property(bdaddr_t *src, uint16_t id,
			const char *key, const char *value)
{
	char filename[PATH_MAX + 1];
	char addr[18];

	ba2str(src, addr);
	if (id == BNEP_SVC_NAP)
		create_name(filename, PATH_MAX, STORAGEDIR, addr, "nap");
	else if (id == BNEP_SVC_GN)
		create_name(filename, PATH_MAX, STORAGEDIR, addr, "gn");
	else if (id == BNEP_SVC_PANU)
		create_name(filename, PATH_MAX, STORAGEDIR, addr, "panu");

	return textfile_put(filename, key, value);
}

static void setup_free(struct setup_session *s)
{
	g_free(s->address);
	g_free(s);
}

static int setup_cmp(const struct setup_session *s, const char *addr)
{
	return strcmp(s->address, addr);
}

static void add_lang_attr(sdp_record_t *r)
{
	sdp_lang_attr_t base_lang;
	sdp_list_t *langs = 0;

	/* UTF-8 MIBenum (http://www.iana.org/assignments/character-sets) */
	base_lang.code_ISO639 = (0x65 << 8) | 0x6e;
	base_lang.encoding = 106;
	base_lang.base_offset = SDP_PRIMARY_LANG_BASE;
	langs = sdp_list_append(0, &base_lang);
	sdp_set_lang_attr(r, langs);
	sdp_list_free(langs, 0);
}

static int create_server_record(sdp_buf_t *buf, const char *name,
					uint16_t id)
{
	sdp_list_t *svclass, *pfseq, *apseq, *root, *aproto;
	uuid_t root_uuid, pan, l2cap, bnep;
	sdp_profile_desc_t profile[1];
	sdp_list_t *proto[2];
	sdp_data_t *v, *p;
	uint16_t psm = BNEP_PSM, version = 0x0100;
	uint16_t security_desc = (security ? 0x0001 : 0x0000);
	uint16_t net_access_type = 0xfffe;
	uint32_t max_net_access_rate = 0;
	const char *desc = "BlueZ PAN service";
	sdp_record_t record;
	int ret;

	memset(&record, 0, sizeof(sdp_record_t));

	switch (id) {
	case BNEP_SVC_NAP:
		sdp_uuid16_create(&pan, NAP_SVCLASS_ID);
		svclass = sdp_list_append(NULL, &pan);
		sdp_set_service_classes(&record, svclass);

		sdp_uuid16_create(&profile[0].uuid, NAP_PROFILE_ID);
		profile[0].version = 0x0100;
		pfseq = sdp_list_append(NULL, &profile[0]);
		sdp_set_profile_descs(&record, pfseq);

		sdp_set_info_attr(&record, name, NULL, desc);

		sdp_attr_add_new(&record, SDP_ATTR_NET_ACCESS_TYPE,
					SDP_UINT16, &net_access_type);
		sdp_attr_add_new(&record, SDP_ATTR_MAX_NET_ACCESSRATE,
					SDP_UINT32, &max_net_access_rate);
		break;
	case BNEP_SVC_GN:
		sdp_uuid16_create(&pan, GN_SVCLASS_ID);
		svclass = sdp_list_append(NULL, &pan);
		sdp_set_service_classes(&record, svclass);

		sdp_uuid16_create(&profile[0].uuid, GN_PROFILE_ID);
		profile[0].version = 0x0100;
		pfseq = sdp_list_append(NULL, &profile[0]);
		sdp_set_profile_descs(&record, pfseq);

		sdp_set_info_attr(&record, name, NULL, desc);
		break;
	case BNEP_SVC_PANU:
		sdp_uuid16_create(&pan, PANU_SVCLASS_ID);
		svclass = sdp_list_append(NULL, &pan);
		sdp_set_service_classes(&record, svclass);

		sdp_uuid16_create(&profile[0].uuid, PANU_PROFILE_ID);
		profile[0].version = 0x0100;
		pfseq = sdp_list_append(NULL, &profile[0]);
		sdp_set_profile_descs(&record, pfseq);

		sdp_set_info_attr(&record, name, NULL, desc);
		break;
	default:
		return -1;
	}

	sdp_uuid16_create(&root_uuid, PUBLIC_BROWSE_GROUP);
	root = sdp_list_append(NULL, &root_uuid);
	sdp_set_browse_groups(&record, root);

	sdp_uuid16_create(&l2cap, L2CAP_UUID);
	proto[0] = sdp_list_append(NULL, &l2cap);
	p = sdp_data_alloc(SDP_UINT16, &psm);
	proto[0] = sdp_list_append(proto[0], p);
	apseq    = sdp_list_append(NULL, proto[0]);

	sdp_uuid16_create(&bnep, BNEP_UUID);
	proto[1] = sdp_list_append(NULL, &bnep);
	v = sdp_data_alloc(SDP_UINT16, &version);
	proto[1] = sdp_list_append(proto[1], v);

	/* Supported protocols */
	{
		uint16_t ptype[] = {
			0x0800,  /* IPv4 */
			0x0806,  /* ARP */
		};
		sdp_data_t *head, *pseq;
		int p;

		for (p = 0, head = NULL; p < 2; p++) {
			sdp_data_t *data = sdp_data_alloc(SDP_UINT16, &ptype[p]);
			if (head)
				sdp_seq_append(head, data);
			else
				head = data;
		}
		pseq = sdp_data_alloc(SDP_SEQ16, head);
		proto[1] = sdp_list_append(proto[1], pseq);
	}

	apseq = sdp_list_append(apseq, proto[1]);

	aproto = sdp_list_append(NULL, apseq);
	sdp_set_access_protos(&record, aproto);

	add_lang_attr(&record);

	sdp_attr_add_new(&record, SDP_ATTR_SECURITY_DESC,
				SDP_UINT16, &security_desc);

	if (sdp_gen_record_pdu(&record, buf) < 0)
		ret = -1;
	else
		ret = 0;

	sdp_data_free(p);
	sdp_data_free(v);
	sdp_list_free(apseq, NULL);
	sdp_list_free(root, NULL);
	sdp_list_free(aproto, NULL);
	sdp_list_free(proto[0], NULL);
	sdp_list_free(proto[1], NULL);
	sdp_list_free(svclass, NULL);
	sdp_list_free(pfseq, NULL);
	sdp_list_free(record.attrlist, (sdp_free_func_t) sdp_data_free);
	sdp_list_free(record.pattern, free);

	return ret;
}

static ssize_t send_bnep_ctrl_rsp(int sk, uint16_t response)
{
	struct bnep_control_rsp rsp;

	rsp.type = BNEP_CONTROL;
	rsp.ctrl = BNEP_SETUP_CONN_RSP;
	rsp.resp = htons(response);

	return send(sk, &rsp, sizeof(rsp), 0);
}

static void cancel_authorization(struct setup_session *s)
{
	DBusMessage *msg;
	const char *uuid;

	msg = dbus_message_new_method_call("org.bluez", "/org/bluez",
						"org.bluez.Database",
						"CancelAuthorizationRequest");
	if (!msg) {
		error("Unable to allocate new method call");
		return;
	}

	uuid = bnep_uuid(s->dst_role);
	dbus_message_append_args(msg,
			DBUS_TYPE_STRING, &s->address,
			DBUS_TYPE_STRING, &uuid,
			DBUS_TYPE_INVALID);

	send_message_and_unref(connection, msg);
}

static void authorization_callback(DBusPendingCall *pcall, void *data)
{
	struct setup_session *s = data;
	struct network_server *ns = NULL;
	DBusMessage *reply = dbus_pending_call_steal_reply(pcall);
	char path[MAX_PATH_LENGTH], devname[16];
	uint16_t response = BNEP_CONN_NOT_ALLOWED;
	DBusError derr;
	const char *bridge;

	if (!g_slist_find(setup_sessions, s)) {
		dbus_message_unref(reply);
		return;
	}

	snprintf(path, MAX_PATH_LENGTH, NETWORK_PATH"/%s", bnep_name(s->dst_role));
	dbus_connection_get_object_user_data(connection, path, (void *) &ns);

	/* Server can be disabled in the meantime */
	if (ns == NULL || ns->enable == FALSE)
		goto failed;

	dbus_error_init(&derr);
	if (dbus_set_error_from_message(&derr, reply)) {
		error("Access denied: %s", derr.message);
		if (dbus_error_has_name(&derr, DBUS_ERROR_NO_REPLY)) {
			debug("Canceling authorization request");
			cancel_authorization(s);
		}
		dbus_error_free(&derr);
		goto failed;
	}

	memset(devname, 0, 16);
	strncpy(devname, prefix, strlen(prefix));

	if (bnep_connadd(s->nsk, s->dst_role, devname) < 0)
		goto failed;

	info("Authorization succedded. New connection: %s", devname);

	bridge = bridge_get_name(ns->id);
	if (bridge) {
		if (bridge_add_interface(ns->id, devname) < 0) {
			error("Can't add %s to the bridge %s: %s(%d)",
					devname, bridge, strerror(errno),
					errno);
			goto failed;
		}

		bnep_if_up(devname, 0);
	} else
		bnep_if_up(devname, ns->id);

	response = BNEP_SUCCESS;

	ns->clients = g_slist_append(ns->clients, g_strdup(s->address));

failed:
	send_bnep_ctrl_rsp(s->nsk, response);
	dbus_message_unref(reply);
}

static void setup_watch_destroy(void *data)
{
	struct setup_session *s;
	GSList *l;

	/*
	 * Remote initiated: socket HUP
	 * Authorization: denied/accepted
	 */
	l = g_slist_find(setup_sessions, data);
	if (!l)
		return;

	s = l->data;

	setup_sessions = g_slist_remove(setup_sessions, s);

	/* Remove active watches */
	if (s->watch)
		g_source_remove(s->watch);
	if (s->timeout)
		g_source_remove(s->timeout);
	setup_free(s);
}

static int authorize_connection(struct setup_session *s)
{
	DBusMessage *msg;
	DBusPendingCall *pending;
	const char *uuid;

	msg = dbus_message_new_method_call("org.bluez", "/org/bluez",
				"org.bluez.Database", "RequestAuthorization");
	if (!msg) {
		error("Unable to allocat new RequestAuthorization method call");
		return -ENOMEM;
	}

	uuid = bnep_uuid(s->dst_role);
	debug("Requesting authorization for %s UUID:%s", s->address, uuid);

	dbus_message_append_args(msg,
			DBUS_TYPE_STRING, &s->address,
			DBUS_TYPE_STRING, &uuid,
			DBUS_TYPE_INVALID);

	if (dbus_connection_send_with_reply(connection,
				msg, &pending, -1) == FALSE) {
		error("Sending of authorization request failed");
		dbus_message_unref(msg);
		return -EACCES;
	}

	dbus_pending_call_set_notify(pending,
			authorization_callback, s, setup_watch_destroy);
	dbus_pending_call_unref(pending);
	dbus_message_unref(msg);

	return 0;
}

static uint16_t inline chk_role(uint16_t dst_role, uint16_t src_role)
{
	/* Allowed PAN Profile scenarios */
	switch (dst_role) {
	case BNEP_SVC_NAP:
	case BNEP_SVC_GN:
		if (src_role == BNEP_SVC_PANU)
			return 0;
		return BNEP_CONN_INVALID_SRC;