Btio library is the low level socket API for BT RFCOMM connection.
---
plugins/btio.c | 479 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
plugins/btio.h | 118 ++++++++++++++
2 files changed, 597 insertions(+), 0 deletions(-)
create mode 100644 plugins/btio.c
create mode 100644 plugins/btio.h
diff --git a/plugins/btio.c b/plugins/btio.c
new file mode 100644
index 0000000..6156027
--- /dev/null
+++ b/plugins/btio.c
@@ -0,0 +1,479 @@
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2009 Marcel Holtmann <marcel@xxxxxxxxxxxx>
+ * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2010 Intel Corporation. All rights reserved.
+ *
+ *
+ * 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
+ *
+ */
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <poll.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <glib.h>
+
+#include "btio.h"
+
+#define ERROR_FAILED(gerr, str, err) \
+ g_set_error(gerr, BT_IO_ERROR, BT_IO_ERROR_FAILED, \
+ str ": %s (%d)", strerror(err), err)
+
+#define DEFAULT_DEFER_TIMEOUT 30
+
+struct set_opts {
+ bdaddr_t src;
+ int defer;
+ int sec_level;
+ uint8_t channel;
+ int master;
+};
+
+struct connect {
+ BtIOConnect connect;
+ gpointer user_data;
+ GDestroyNotify destroy;
+};
+
+struct accept {
+ BtIOConnect connect;
+ gpointer user_data;
+ GDestroyNotify destroy;
+};
+
+struct server {
+ BtIOConnect connect;
+ BtIOConfirm confirm;
+ gpointer user_data;
+ GDestroyNotify destroy;
+};
+
+static inline void bacpy(bdaddr_t *dst, const bdaddr_t *src)
+{
+ memcpy(dst, src, sizeof(bdaddr_t));
+}
+
+static void baswap(bdaddr_t *dst, const bdaddr_t *src)
+{
+ register unsigned char *d = (unsigned char *) dst;
+ register const unsigned char *s = (const unsigned char *) src;
+ register int i;
+
+ for (i = 0; i < 6; i++)
+ d[i] = s[5-i];
+}
+
+static int ba2str(const bdaddr_t *ba, char *str)
+{
+ uint8_t b[6];
+
+ baswap((bdaddr_t *) b, ba);
+ return sprintf(str, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X",
+ b[0], b[1], b[2], b[3], b[4], b[5]);
+}
+
+static void server_remove(struct server *server)
+{
+ if (server->destroy)
+ server->destroy(server->user_data);
+ g_free(server);
+}
+
+static void accept_remove(struct accept *accept)
+{
+ if (accept->destroy)
+ accept->destroy(accept->user_data);
+ g_free(accept);
+}
+
+static gboolean accept_cb(GIOChannel *io, GIOCondition cond,
+ gpointer user_data)
+{
+ struct accept *accept = user_data;
+ GError *err = NULL;
+
+ /* If the user aborted this accept attempt */
+ if (cond & G_IO_NVAL)
+ return FALSE;
+
+ if (cond & (G_IO_HUP | G_IO_ERR))
+ g_set_error(&err, BT_IO_ERROR, BT_IO_ERROR_DISCONNECTED,
+ "HUP or ERR on socket");
+
+ accept->connect(io, err, accept->user_data);
+
+ g_clear_error(&err);
+
+ return FALSE;
+}
+
+static gboolean server_cb(GIOChannel *io, GIOCondition cond,
+ gpointer user_data)
+{
+ struct server *server = user_data;
+ int srv_sock, cli_sock;
+ GIOChannel *cli_io;
+
+ /* If the user closed the server */
+ if (cond & G_IO_NVAL)
+ return FALSE;
+
+ srv_sock = g_io_channel_unix_get_fd(io);
+
+ cli_sock = accept(srv_sock, NULL, NULL);
+ if (cli_sock < 0)
+ return TRUE;
+
+ cli_io = g_io_channel_unix_new(cli_sock);
+
+ g_io_channel_set_close_on_unref(cli_io, TRUE);
+ g_io_channel_set_flags(cli_io, G_IO_FLAG_NONBLOCK, NULL);
+
+ if (server->confirm)
+ server->confirm(cli_io, server->user_data);
+ else
+ server->connect(cli_io, NULL, server->user_data);
+
+ g_io_channel_unref(cli_io);
+
+ return TRUE;
+}
+
+static void server_add(GIOChannel *io, BtIOConnect connect,
+ BtIOConfirm confirm, gpointer user_data,
+ GDestroyNotify destroy)
+{
+ struct server *server;
+ GIOCondition cond;
+
+ server = g_new0(struct server, 1);
+ server->connect = connect;
+ server->confirm = confirm;
+ server->user_data = user_data;
+ server->destroy = destroy;
+
+ cond = G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL;
+ g_io_add_watch_full(io, G_PRIORITY_DEFAULT, cond, server_cb, server,
+ (GDestroyNotify) server_remove);
+}
+
+static void accept_add(GIOChannel *io, BtIOConnect connect, gpointer user_data,
+ GDestroyNotify destroy)
+{
+ struct accept *accept;
+ GIOCondition cond;
+
+ accept = g_new0(struct accept, 1);
+ accept->connect = connect;
+ accept->user_data = user_data;
+ accept->destroy = destroy;
+
+ cond = G_IO_OUT | G_IO_ERR | G_IO_HUP | G_IO_NVAL;
+ g_io_add_watch_full(io, G_PRIORITY_DEFAULT, cond, accept_cb, accept,
+ (GDestroyNotify) accept_remove);
+}
+
+static int rfcomm_set_lm(int sock, int level)
+{
+ int lm_map[] = {
+ 0,
+ RFCOMM_LM_AUTH,
+ RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT,
+ RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT | RFCOMM_LM_SECURE,
+ }, opt = lm_map[level];
+
+ if (setsockopt(sock, SOL_RFCOMM, RFCOMM_LM, &opt, sizeof(opt)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static gboolean set_sec_level(int sock, BtIOType type, int level, GError **err)
+{
+ struct bt_security sec;
+ int ret;
+
+ if (level < BT_SECURITY_LOW || level > BT_SECURITY_HIGH) {
+ g_set_error(err, BT_IO_ERROR, BT_IO_ERROR_INVALID_ARGS,
+ "Valid security level range is %d-%d",
+ BT_SECURITY_LOW, BT_SECURITY_HIGH);
+ return FALSE;
+ }
+
+ memset(&sec, 0, sizeof(sec));
+ sec.level = level;
+
+ if (setsockopt(sock, SOL_BLUETOOTH, BT_SECURITY, &sec,
+ sizeof(sec)) == 0)
+ return TRUE;
+
+ if (errno != ENOPROTOOPT) {
+ ERROR_FAILED(err, "setsockopt(BT_SECURITY)", errno);
+ return FALSE;
+ }
+
+ ret = rfcomm_set_lm(sock, level);
+ if (ret < 0) {
+ ERROR_FAILED(err, "setsockopt(LM)", -ret);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static int rfcomm_bind(int sock, const bdaddr_t *src, uint8_t channel)
+{
+ struct sockaddr_rc addr;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.rc_family = AF_BLUETOOTH;
+ bacpy(&addr.rc_bdaddr, src);
+ addr.rc_channel = channel;
+
+ return bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+}
+
+static gboolean rfcomm_set(int sock, int sec_level, int master, GError **err)
+{
+ if (sec_level && !set_sec_level(sock, BT_IO_RFCOMM, sec_level, err))
+ return FALSE;
+
+ return TRUE;
+}
+
+static gboolean parse_set_opts(struct set_opts *opts, GError **err,
+ BtIOOption opt1, va_list args)
+{
+ BtIOOption opt = opt1;
+
+ memset(opts, 0, sizeof(*opts));
+
+ /* Set defaults */
+ opts->defer = DEFAULT_DEFER_TIMEOUT;
+ opts->master = -1;
+
+ while (opt != BT_IO_OPT_INVALID) {
+ switch (opt) {
+ case BT_IO_OPT_CHANNEL:
+ opts->channel = va_arg(args, int);
+ break;
+ case BT_IO_OPT_SEC_LEVEL:
+ opts->sec_level = va_arg(args, int);
+ break;
+ default:
+ g_set_error(err, BT_IO_ERROR, BT_IO_ERROR_INVALID_ARGS,
+ "Unknown option %d", opt);
+ return FALSE;
+ }
+
+ opt = va_arg(args, int);
+ }
+
+ return TRUE;
+}
+
+static gboolean get_peers(int sock, struct sockaddr *src, struct sockaddr *dst,
+ socklen_t len, GError **err)
+{
+ socklen_t olen;
+
+ memset(src, 0, len);
+ olen = len;
+ if (getsockname(sock, src, &olen) < 0) {
+ ERROR_FAILED(err, "getsockname", errno);
+ return FALSE;
+ }
+
+ memset(dst, 0, len);
+ olen = len;
+ if (getpeername(sock, dst, &olen) < 0) {
+ ERROR_FAILED(err, "getpeername", errno);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static gboolean rfcomm_get(int sock, GError **err, BtIOOption opt1,
+ va_list args)
+{
+ BtIOOption opt = opt1;
+ struct sockaddr_rc src, dst;
+
+ if (!get_peers(sock, (struct sockaddr *) &src,
+ (struct sockaddr *) &dst, sizeof(src), err))
+ return FALSE;
+
+ while (opt != BT_IO_OPT_INVALID) {
+ switch (opt) {
+ case BT_IO_OPT_SOURCE:
+ ba2str(&src.rc_bdaddr, va_arg(args, char *));
+ break;
+ case BT_IO_OPT_DEST:
+ ba2str(&dst.rc_bdaddr, va_arg(args, char *));
+ break;
+ case BT_IO_OPT_CHANNEL:
+ *(va_arg(args, uint8_t *)) = src.rc_channel ?
+ src.rc_channel : dst.rc_channel;
+ break;
+ default:
+ g_set_error(err, BT_IO_ERROR, BT_IO_ERROR_INVALID_ARGS,
+ "Unknown option %d", opt);
+ return FALSE;
+ }
+
+ opt = va_arg(args, int);
+ }
+
+ return TRUE;
+}
+
+static gboolean get_valist(GIOChannel *io, BtIOType type, GError **err,
+ BtIOOption opt1, va_list args)
+{
+ int sock = g_io_channel_unix_get_fd(io);
+
+ if (type != BT_IO_RFCOMM) {
+ g_set_error(err, BT_IO_ERROR, BT_IO_ERROR_INVALID_ARGS,
+ "Unknown BtIO type %d", type);
+ return FALSE;
+ }
+
+ return rfcomm_get(sock, err, opt1, args);
+}
+
+gboolean bt_io_accept(GIOChannel *io, BtIOConnect connect, gpointer user_data,
+ GDestroyNotify destroy, GError **err)
+{
+ int sock;
+ char c;
+ struct pollfd pfd;
+
+ sock = g_io_channel_unix_get_fd(io);
+
+ memset(&pfd, 0, sizeof(pfd));
+ pfd.fd = sock;
+ pfd.events = POLLOUT;
+
+ if (poll(&pfd, 1, 0) < 0) {
+ ERROR_FAILED(err, "poll", errno);
+ return FALSE;
+ }
+
+ if (!(pfd.revents & POLLOUT)) {
+ int ret;
+ ret = read(sock, &c, 1);
+ }
+
+ accept_add(io, connect, user_data, destroy);
+
+ return TRUE;
+}
+
+gboolean bt_io_get(GIOChannel *io, BtIOType type, GError **err,
+ BtIOOption opt1, ...)
+{
+ va_list args;
+ gboolean ret;
+
+ va_start(args, opt1);
+ ret = get_valist(io, type, err, opt1, args);
+ va_end(args);
+
+ return ret;
+}
+
+static GIOChannel *create_io(BtIOType type, gboolean server,
+ struct set_opts *opts, GError **err)
+{
+ int sock;
+ GIOChannel *io;
+
+ if (type != BT_IO_RFCOMM)
+ return NULL;
+
+ sock = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
+ if (sock < 0) {
+ ERROR_FAILED(err, "socket(STREAM, RFCOMM)", errno);
+ return NULL;
+ }
+
+ if (rfcomm_bind(sock, &opts->src,
+ server ? opts->channel : 0) < 0) {
+ ERROR_FAILED(err, "rfcomm_bind", errno);
+ return NULL;
+ }
+
+ if (!rfcomm_set(sock, opts->sec_level, opts->master, err))
+ return NULL;
+
+ io = g_io_channel_unix_new(sock);
+
+ g_io_channel_set_close_on_unref(io, TRUE);
+ g_io_channel_set_flags(io, G_IO_FLAG_NONBLOCK, NULL);
+
+ return io;
+}
+
+GIOChannel *bt_io_listen(BtIOType type, BtIOConnect connect,
+ BtIOConfirm confirm, gpointer user_data,
+ GDestroyNotify destroy, GError **err,
+ BtIOOption opt1, ...)
+{
+ GIOChannel *io;
+ va_list args;
+ struct set_opts opts;
+ int sock;
+ gboolean ret;
+
+ va_start(args, opt1);
+ ret = parse_set_opts(&opts, err, opt1, args);
+ va_end(args);
+
+ if (ret == FALSE)
+ return NULL;
+
+ io = create_io(type, TRUE, &opts, err);
+ if (io == NULL)
+ return NULL;
+
+ sock = g_io_channel_unix_get_fd(io);
+
+ if (confirm)
+ setsockopt(sock, SOL_BLUETOOTH, BT_DEFER_SETUP, &opts.defer,
+ sizeof(opts.defer));
+
+ if (listen(sock, 5) < 0) {
+ ERROR_FAILED(err, "listen", errno);
+ g_io_channel_unref(io);
+ return NULL;
+ }
+
+ server_add(io, connect, confirm, user_data, destroy);
+
+ return io;
+}
+
+GQuark bt_io_error_quark(void)
+{
+ return g_quark_from_static_string("bt-io-error-quark");
+}
diff --git a/plugins/btio.h b/plugins/btio.h
new file mode 100644
index 0000000..78d5961
--- /dev/null
+++ b/plugins/btio.h
@@ -0,0 +1,118 @@
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2009 Marcel Holtmann <marcel@xxxxxxxxxxxx>
+ * Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2010 Intel Corporation. All rights reserved.
+ *
+ *
+ * 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
+ *
+ */
+
+#include <glib.h>
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <endian.h>
+#include <byteswap.h>
+
+#ifndef AF_BLUETOOTH
+#define AF_BLUETOOTH 31
+#define PF_BLUETOOTH AF_BLUETOOTH
+#endif
+
+#define BTPROTO_RFCOMM 3
+#define SOL_RFCOMM 18
+#define SOL_BLUETOOTH 274
+
+struct bt_security {
+ uint8_t level;
+};
+#define BT_SECURITY_SDP 0
+#define BT_SECURITY_LOW 1
+#define BT_SECURITY_MEDIUM 2
+#define BT_SECURITY_HIGH 3
+#define BT_SECURITY 4
+
+#define BT_DEFER_SETUP 7
+
+/* BD Address */
+typedef struct {
+ uint8_t b[6];
+} __attribute__((packed)) bdaddr_t;
+
+#define RFCOMM_LM 0x03
+#define RFCOMM_LM_AUTH 0x0002
+#define RFCOMM_LM_ENCRYPT 0x0004
+#define RFCOMM_LM_TRUSTED 0x0008
+#define RFCOMM_LM_RELIABLE 0x0010
+#define RFCOMM_LM_SECURE 0x0020
+
+#include <sys/socket.h>
+
+/* RFCOMM socket address */
+struct sockaddr_rc {
+ sa_family_t rc_family;
+ bdaddr_t rc_bdaddr;
+ uint8_t rc_channel;
+};
+
+typedef enum {
+ BT_IO_ERROR_DISCONNECTED,
+ BT_IO_ERROR_CONNECT_FAILED,
+ BT_IO_ERROR_FAILED,
+ BT_IO_ERROR_INVALID_ARGS,
+} BtIOError;
+
+#define BT_IO_ERROR bt_io_error_quark()
+
+GQuark bt_io_error_quark(void);
+
+typedef enum {
+ BT_IO_RFCOMM,
+} BtIOType;
+
+typedef enum {
+ BT_IO_OPT_INVALID = 0,
+ BT_IO_OPT_SOURCE,
+ BT_IO_OPT_DEST,
+ BT_IO_OPT_SEC_LEVEL,
+ BT_IO_OPT_CHANNEL,
+} BtIOOption;
+
+typedef enum {
+ BT_IO_SEC_SDP = 0,
+ BT_IO_SEC_LOW,
+ BT_IO_SEC_MEDIUM,
+ BT_IO_SEC_HIGH,
+} BtIOSecLevel;
+
+typedef void (*BtIOConfirm)(GIOChannel *io, gpointer user_data);
+
+typedef void (*BtIOConnect)(GIOChannel *io, GError *err, gpointer user_data);
+
+gboolean bt_io_accept(GIOChannel *io, BtIOConnect connect, gpointer user_data,
+ GDestroyNotify destroy, GError **err);
+
+gboolean bt_io_get(GIOChannel *io, BtIOType type, GError **err,
+ BtIOOption opt1, ...);
+
+GIOChannel *bt_io_listen(BtIOType type, BtIOConnect connect,
+ BtIOConfirm confirm, gpointer user_data,
+ GDestroyNotify destroy, GError **err,
+ BtIOOption opt1, ...);
--
1.7.0.4
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