sdpd/main.c

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2001-2002  Nokia Corporation
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
 *  Copyright (C) 2002-2004  Marcel Holtmann <marcel@holtmann.org>
 *  Copyright (C) 2002-2003  Stephen Crane <steve.crane@rococosoft.com>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation;
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
 *  CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *  ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 
 *  COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 
 *  SOFTWARE IS DISCLAIMED.
 *
 *
 *  $Id$
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <syslog.h>
#include <getopt.h>
#include <sys/un.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>

#include "sdpd.h"

static int l2cap_sock, unix_sock;
static fd_set active_fdset;
static int active_maxfd;

sdp_record_t *server;

/*
 * List of version numbers supported by the SDP server.
 * Add to this list when newer versions are supported.
 */
static sdp_version_t sdpVnumArray[1] = {
	{1, 0}
};
const int sdpServerVnumEntries = 1;

/*
 * The service database state is an attribute of the service record
 * of the SDP server itself. This attribute is guaranteed to
 * change if any of the contents of the service repository
 * changes. This function updates the timestamp of value of
 * the svcDBState attribute
 * Set the SDP server DB. Simply a timestamp which is the marker
 * when the DB was modified.
 */
void update_db_timestamp(void)
{
	uint32_t dbts = sdp_get_time();
	sdp_data_t *d = sdp_data_alloc(SDP_UINT32, &dbts);
	sdp_attr_replace(server, SDP_ATTR_SVCDB_STATE, d);
}

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

	base_lang.code_ISO639 = (0x65 << 8) | 0x6e;
	// UTF-8 MIBenum (http://www.iana.org/assignments/character-sets)
	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 void register_public_browse_group(void)
{
	sdp_list_t *browselist;
	uuid_t bgscid, pbgid;
	sdp_data_t *sdpdata;
	sdp_record_t *browse = sdp_record_alloc();

	browse->handle = sdp_next_handle();
	if (browse->handle < 0x10000)
		return;

	sdp_record_add(browse);
	sdpdata = sdp_data_alloc(SDP_UINT32, &browse->handle);
	sdp_attr_add(browse, SDP_ATTR_RECORD_HANDLE, sdpdata);

	add_lang_attr(browse);
	sdp_set_info_attr(browse, "Public Browse Group Root", "BlueZ", "Root of public browse hierarchy");

	sdp_uuid16_create(&bgscid, BROWSE_GRP_DESC_SVCLASS_ID);
	browselist = sdp_list_append(0, &bgscid);
	sdp_set_service_classes(browse, browselist);
	sdp_list_free(browselist, 0);

	sdp_uuid16_create(&pbgid, PUBLIC_BROWSE_GROUP);
	sdp_set_group_id(browse, pbgid);
}

/*
 * The SDP server must present its own service record to
 * the service repository. This can be accessed by service
 * discovery clients. This method constructs a service record
 * and stores it in the repository
 */
static void register_server_service(void)
{
	int i;
	sdp_list_t *classIDList, *browseList;
	sdp_list_t *access_proto = 0;
	uuid_t l2cap, classID, browseGroupId, sdpSrvUUID;
	void **versions, **versionDTDs;
	uint8_t dtd;
	uint16_t version, port;
	sdp_data_t *pData, *port_data, *version_data;
	sdp_list_t *pd, *seq;

	server = sdp_record_alloc();
	server->pattern = NULL;

	/* Force the record to be SDP_SERVER_RECORD_HANDLE */
	server->handle = SDP_SERVER_RECORD_HANDLE;

	sdp_record_add(server);
	sdp_attr_add(server, SDP_ATTR_RECORD_HANDLE, sdp_data_alloc(SDP_UINT32, &server->handle));

	/*
	 * Add all attributes to service record. (No need to commit since we 
	 * are the server and this record is already in the database.)
	 */
	add_lang_attr(server);
	sdp_set_info_attr(server, "SDP Server", "BlueZ", "Bluetooth service discovery server");

	sdp_uuid16_create(&classID, SDP_SERVER_SVCLASS_ID);
	classIDList = sdp_list_append(0, &classID);
	sdp_set_service_classes(server, classIDList);
	sdp_list_free(classIDList, 0);

	/*
	 * Set the version numbers supported, these are passed as arguments
	 * to the server on command line. Now defaults to 1.0
	 * Build the version number sequence first
	 */
	versions = (void **)malloc(sdpServerVnumEntries * sizeof(void *));
	versionDTDs = (void **)malloc(sdpServerVnumEntries * sizeof(void *));
	dtd = SDP_UINT16;
	for (i = 0; i < sdpServerVnumEntries; i++) {
		uint16_t *version = (uint16_t *)malloc(sizeof(uint16_t));
		*version = sdpVnumArray[i].major;
		*version = (*version << 8);
		*version |= sdpVnumArray[i].minor;
		versions[i] = version;
		versionDTDs[i] = &dtd;
	}
	pData = sdp_seq_alloc(versionDTDs, versions, sdpServerVnumEntries);
	for (i = 0; i < sdpServerVnumEntries; i++)
		free(versions[i]);
	free(versions);
	free(versionDTDs);
	sdp_attr_add(server, SDP_ATTR_VERSION_NUM_LIST, pData);

	sdp_uuid16_create(&sdpSrvUUID, SDP_UUID);
	sdp_set_service_id(server, sdpSrvUUID);

	sdp_uuid16_create(&l2cap, L2CAP_UUID);
	pd = sdp_list_append(0, &l2cap);
	port = SDP_PSM;
	port_data = sdp_data_alloc(SDP_UINT16, &port);
	pd = sdp_list_append(pd, port_data);
	version = 1;
	version_data = sdp_data_alloc(SDP_UINT16, &version);
	pd = sdp_list_append(pd, version_data);
	seq = sdp_list_append(0, pd);

	access_proto = sdp_list_append(0, seq);
	sdp_set_access_protos(server, access_proto);
	sdp_list_free(access_proto, free);
	sdp_data_free(port_data);
	sdp_data_free(version_data);
	sdp_list_free(pd, 0);

	sdp_uuid16_create(&browseGroupId, PUBLIC_BROWSE_GROUP);
	browseList = sdp_list_append(0, &browseGroupId);
	sdp_set_browse_groups(server, browseList);
	sdp_list_free(browseList, 0);

	update_db_timestamp();
}

/*
 * SDP server initialization on startup includes creating the
 * l2cap and unix sockets over which discovery and registration clients
 * access us respectively
 */
int init_server(int master)
{
	struct sockaddr_l2 l2addr;
	struct sockaddr_un unaddr;

	/* Register the public browse group root */
	register_public_browse_group();

	/* Register the SDP server's service record */
	register_server_service();

	/* Create L2CAP socket */
	l2cap_sock = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
	if (l2cap_sock == -1) {
		SDPERR("opening L2CAP socket: %s", strerror(errno));
		return -1;
	}

	l2addr.l2_bdaddr = *BDADDR_ANY;
	l2addr.l2_family = AF_BLUETOOTH;
	l2addr.l2_psm    = htobs(SDP_PSM);
	if (0 > bind(l2cap_sock, (struct sockaddr *)&l2addr, sizeof(l2addr))) {
		SDPERR("binding L2CAP socket: %s", strerror(errno));
		return -1;
	}

	if (master) {
		int opt = L2CAP_LM_MASTER;
		if (0 > setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_LM, &opt, sizeof(opt))) {
			SDPERR("setsockopt: %s", strerror(errno));
			return -1;
		}
	}
	listen(l2cap_sock, 5);
	FD_SET(l2cap_sock, &active_fdset);
	active_maxfd = l2cap_sock;

	/* Create local Unix socket */
	unix_sock = socket(PF_UNIX, SOCK_STREAM, 0);
	if (unix_sock == -1) {
		SDPERR("opening UNIX socket: %s", strerror(errno));
		return -1;
	}
	unaddr.sun_family = AF_UNIX;
	strcpy(unaddr.sun_path, SDP_UNIX_PATH);
	unlink(unaddr.sun_path);
	if (0 > bind(unix_sock, (struct sockaddr *)&unaddr, sizeof(unaddr))) {
		SDPERR("binding UNIX socket: %s", strerror(errno));
		return -1;
	}
	listen(unix_sock, 5);
	FD_SET(unix_sock, &active_fdset);
	active_maxfd = unix_sock;
	chmod(SDP_UNIX_PATH, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
	return 0;
}

void sig_term(int sig)
{
	SDPINF("terminating... \n");
	sdp_svcdb_reset();
	close(l2cap_sock);
	close(unix_sock);
	exit(0);
}

int become_daemon(void)
{
	int fd;

	if (getppid() != 1) {
		signal(SIGTTOU, SIG_IGN);
		signal(SIGTTIN, SIG_IGN);
		signal(SIGTSTP, SIG_IGN);
		if (fork())
			return 0;
		setsid();
	}
	for (fd = 0; fd < 3; fd++)
		close(fd);

	chdir("/");
	return 1;
}

static inline void handle_request(int sk, char *data, int len)
{
	struct sockaddr_l2 sa;
	int size;
	sdp_req_t req;

	size = sizeof(sa);
	if (getpeername(sk, (struct sockaddr *)&sa, &size) < 0)
		return;

	if (sa.l2_family == AF_BLUETOOTH) { 
		struct l2cap_options lo;
		memset(&lo, 0, sizeof(lo));
		size = sizeof(lo);
		getsockopt(sk, SOL_L2CAP, L2CAP_OPTIONS, &lo, &size);
		req.bdaddr = sa.l2_bdaddr;
		req.mtu    = lo.omtu;
		req.local  = 0;
	} else {
		req.bdaddr = *BDADDR_LOCAL;
		req.mtu    = 2048;
		req.local  = 1;
	}
	req.sock = sk;
	req.buf  = data;
	req.len  = len;
	process_request(&req);
}

static void close_sock(int fd, int r)
{
	if (r < 0)
		SDPERR("Read error: %s", strerror(errno));
	FD_CLR(fd, &active_fdset);
	close(fd);
	sdp_svcdb_collect_all(fd);
	if (fd == active_maxfd)
		active_maxfd--;
}

static void check_active(fd_set *mask, int num)
{
	sdp_pdu_hdr_t hdr;
	int size, fd, count, r;
	char *buf;

	for (fd = 0, count = 0; fd <= active_maxfd && count < num; fd++) {
		if (fd == l2cap_sock || fd == unix_sock || !FD_ISSET(fd, mask))
			continue;

		count++;

		r = recv(fd, (void *)&hdr, sizeof(sdp_pdu_hdr_t), MSG_PEEK);
		if (r <= 0) {
			close_sock(fd, r);
			continue;
		}
	       
		size = sizeof(sdp_pdu_hdr_t) + ntohs(hdr.plen);
		buf = malloc(size);
		if (!buf)
			continue;
		
		r = recv(fd, buf, size, 0);
		if (r <= 0)
			close_sock(fd, r);
		else
			handle_request(fd, buf, r);       
	}
}

void usage(void)
{
	printf("sdpd version %s\n", VERSION);
	printf("Usage:\n"
		"sdpd [-n] [-m]\n"
	);
}

static struct option main_options[] = {
        {"help", 0,0, 'h'},
        {"nodaemon",  0,0, 'n'},
        {"master",  0,0, 'm'},
        {0, 0, 0, 0}
};

int main(int argc, char **argv)
{
	int daemon = 1;
	int master = 0;
	int opt;

	while ((opt = getopt_long(argc, argv, "nm", main_options, NULL)) != -1)
		switch (opt) {
		case 'n':
			daemon = 0;
			break;
		case 'm':
			master = 1;
			break;
		default:
			usage();
			exit(0);
		}
	openlog("sdpd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
	
	if (daemon && !become_daemon())
		return 0;

	argc -= optind;
	argv += optind;

	if (init_server(master) < 0) {
		SDPERR("Server initialization failed");
		return -1;
	}

	SDPINF("Bluetooth SDP daemon");

	signal(SIGINT,  sig_term);
	signal(SIGTERM, sig_term);
	signal(SIGABRT, sig_term);
	signal(SIGQUIT, sig_term);
	signal(SIGPIPE, SIG_IGN);

	for (;;) {
		int num, nfd;
		fd_set mask;

		FD_ZERO(&mask);
		mask = active_fdset;

		num = select(active_maxfd + 1, &mask, NULL, NULL, NULL);
		if (num <= 0) {
			SDPDBG("Select error:%s", strerror(errno));
			goto exit;
		}

		if (FD_ISSET(l2cap_sock, &mask)) {
			/* New L2CAP connection  */
			struct sockaddr_l2 caddr;
			socklen_t len = sizeof(caddr);

			nfd = accept(l2cap_sock, (struct sockaddr *)&caddr, &len);
			if (nfd >= 0) {
				if (nfd > active_maxfd)
					active_maxfd = nfd;
				FD_SET(nfd, &active_fdset);
			}
		} else if (FD_ISSET(unix_sock, &mask)) {
			/* New unix connection */
			struct sockaddr_un caddr;
			socklen_t len = sizeof(caddr);

			nfd = accept(unix_sock, (struct sockaddr *)&caddr, &len);
			if (nfd != -1) {
				if (nfd > active_maxfd)
					active_maxfd = nfd;
				FD_SET(nfd, &active_fdset);
			}
		} else
			check_active(&mask, num);
	}
exit:
	sdp_svcdb_reset();
	return 0;
}