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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2001-2002 Nokia Corporation
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
* Copyright (C) 2002-2010 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 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 <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <cutils/sockets.h>

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

#include <sys/un.h>
#include <netinet/in.h>

#include <glib.h>

#include "log.h"
#include "sdpd.h"

static guint l2cap_id = 0, unix_id = 0;

static int l2cap_sock, unix_sock;

/*
* SDP server initialization on startup includes creating the
* l2cap and unix sockets over which discovery and registration clients
* access us respectively
*/
static int init_server(uint16_t mtu, int master, int compat)
{
struct l2cap_options opts;
struct sockaddr_l2 l2addr;
struct sockaddr_un unaddr;
socklen_t optlen;

/* 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 < 0) {
error("opening L2CAP socket: %s", strerror(errno));
return -1;
}

memset(&l2addr, 0, sizeof(l2addr));
l2addr.l2_family = AF_BLUETOOTH;
bacpy(&l2addr.l2_bdaddr, BDADDR_ANY);
l2addr.l2_psm = htobs(SDP_PSM);

if (bind(l2cap_sock, (struct sockaddr *) &l2addr, sizeof(l2addr)) < 0) {
error("binding L2CAP socket: %s", strerror(errno));
return -1;
}

if (master) {
int opt = L2CAP_LM_MASTER;
if (setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_LM, &opt, sizeof(opt)) < 0) {
error("setsockopt: %s", strerror(errno));
return -1;
}
}

if (mtu > 0) {
memset(&opts, 0, sizeof(opts));
optlen = sizeof(opts);

if (getsockopt(l2cap_sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, &optlen) < 0) {
error("getsockopt: %s", strerror(errno));
return -1;
}

opts.omtu = mtu;
opts.imtu = mtu;

if (setsockopt(l2cap_sock, SOL_L2CAP, L2CAP_OPTIONS, &opts, sizeof(opts)) < 0) {
error("setsockopt: %s", strerror(errno));
return -1;
}
}

if (listen(l2cap_sock, 5) < 0) {
error("listen: %s", strerror(errno));
return -1;
}

if (!compat) {
unix_sock = -1;
return 0;
}
#if 0
/* Create local Unix socket */
unix_sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (unix_sock < 0) {
error("opening UNIX socket: %s", strerror(errno));
return -1;
}

memset(&unaddr, 0, sizeof(unaddr));
unaddr.sun_family = AF_UNIX;
strcpy(unaddr.sun_path, SDP_UNIX_PATH);

unlink(unaddr.sun_path);

if (bind(unix_sock, (struct sockaddr *) &unaddr, sizeof(unaddr)) < 0) {
error("binding UNIX socket: %s", strerror(errno));
return -1;
}

listen(unix_sock, 5);

chmod(SDP_UNIX_PATH, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
#else
        unix_sock = android_get_control_socket("bluetooth");
        if (unix_sock < 0) {
                error("Unable to get the control socket for 'bluetooth'");
                return -1;
        }

        if (listen(unix_sock, 5)) {
                error("Listening on local socket failed: %s", strerror(errno));
                return -1;
        }

        info("Got Unix socket fd '%d' from environment", unix_sock);
#endif
        return 0;
}

static gboolean io_session_event(GIOChannel *chan, GIOCondition cond, gpointer data)
{
sdp_pdu_hdr_t hdr;
uint8_t *buf;
int sk, len, size;

if (cond & G_IO_NVAL)
return FALSE;

sk = g_io_channel_unix_get_fd(chan);

if (cond & (G_IO_HUP | G_IO_ERR)) {
sdp_svcdb_collect_all(sk);
return FALSE;
}

len = recv(sk, &hdr, sizeof(sdp_pdu_hdr_t), MSG_PEEK);
if (len <= 0) {
sdp_svcdb_collect_all(sk);
return FALSE;
}

size = sizeof(sdp_pdu_hdr_t) + ntohs(hdr.plen);
buf = malloc(size);
if (!buf)
return TRUE;

len = recv(sk, buf, size, 0);
if (len <= 0) {
sdp_svcdb_collect_all(sk);
free(buf);
return FALSE;
}

handle_request(sk, buf, len);

return TRUE;
}

static gboolean io_accept_event(GIOChannel *chan, GIOCondition cond, gpointer data)
{
GIOChannel *io;
int nsk;

if (cond & (G_IO_HUP | G_IO_ERR | G_IO_NVAL))
return FALSE;

if (data == &l2cap_sock) {
struct sockaddr_l2 addr;
socklen_t len = sizeof(addr);

nsk = accept(l2cap_sock, (struct sockaddr *) &addr, &len);
} else if (data == &unix_sock) {
struct sockaddr_un addr;
socklen_t len = sizeof(addr);

nsk = accept(unix_sock, (struct sockaddr *) &addr, &len);
} else
return FALSE;

if (nsk < 0) {
error("Can't accept connection: %s", strerror(errno));
return TRUE;
}

io = g_io_channel_unix_new(nsk);
g_io_channel_set_close_on_unref(io, TRUE);

g_io_add_watch(io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
io_session_event, data);

g_io_channel_unref(io);

return TRUE;
}

int start_sdp_server(uint16_t mtu, const char *did, uint32_t flags)
{
int compat = flags & SDP_SERVER_COMPAT;
int master = flags & SDP_SERVER_MASTER;
GIOChannel *io;

info("Starting SDP server");

if (init_server(mtu, master, compat) < 0) {
error("Server initialization failed");
return -1;
}

if (did && strlen(did) > 0) {
const char *ptr = did;
uint16_t vid = 0x0000, pid = 0x0000, ver = 0x0000;

vid = (uint16_t) strtol(ptr, NULL, 16);
ptr = strchr(ptr, ':');
if (ptr) {
pid = (uint16_t) strtol(ptr + 1, NULL, 16);
ptr = strchr(ptr + 1, ':');
if (ptr)
ver = (uint16_t) strtol(ptr + 1, NULL, 16);
register_device_id(vid, pid, ver);
}
}

io = g_io_channel_unix_new(l2cap_sock);
g_io_channel_set_close_on_unref(io, TRUE);

l2cap_id = g_io_add_watch(io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
io_accept_event, &l2cap_sock);
g_io_channel_unref(io);

if (compat && unix_sock > fileno(stderr)) {
io = g_io_channel_unix_new(unix_sock);
g_io_channel_set_close_on_unref(io, TRUE);

unix_id = g_io_add_watch(io,
G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
io_accept_event, &unix_sock);
g_io_channel_unref(io);
}

return 0;
}

void stop_sdp_server(void)
{
info("Stopping SDP server");

sdp_svcdb_reset();

if (unix_id > 0)
g_source_remove(unix_id);

if (l2cap_id > 0)
g_source_remove(l2cap_id);

l2cap_id = unix_id = 0;
l2cap_sock = unix_sock = -1;
}
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