summaryrefslogtreecommitdiffstats
path: root/hcid/dbus.c
blob: 3be67d26953d7bf1e31deec39928541d0abe9431 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
#include <stdio.h>
#include <sys/socket.h>
#include <sys/syslog.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

#define DBUS_API_SUBJECT_TO_CHANGE
#include <dbus/dbus.h>

#include "hcid.h"
#include "glib-ectomy.h"

static DBusConnection *connection;

#define TIMEOUT (30 * 1000)		// 30 seconds

#define SERVICE_NAME "org.bluez.PinAgent"
#define INTERFACE_NAME SERVICE_NAME
#define REQUEST_NAME "PinRequest"
#define PATH_NAME "/org/bluez/PinAgent"

#define WRONG_ARGS_ERROR "org.bluez.Error.WrongArgs"

struct pin_request
{
	int dev;
	bdaddr_t bda;
};

static void reply_handler_function(DBusPendingCall *call, void *user_data)
{
	struct pin_request *req = (struct pin_request *) user_data;
	pin_code_reply_cp pr;
	DBusMessage *message;
	DBusMessageIter iter;
	int type;
	size_t len;
	char *pin;

	message = dbus_pending_call_get_reply(call);

	if (dbus_message_is_error(message, WRONG_ARGS_ERROR))
		goto error;

	dbus_message_iter_init(message, &iter);

	type = dbus_message_iter_get_arg_type(&iter);
	if (type != DBUS_TYPE_STRING)
		goto error;

	pin = dbus_message_iter_get_string(&iter);
	len = strlen(pin);

	memset(&pr, 0, sizeof(pr));
	bacpy(&pr.bdaddr, &req->bda);
	memcpy(pr.pin_code, pin, len);
	pr.pin_len = len;
	hci_send_cmd(req->dev, OGF_LINK_CTL, OCF_PIN_CODE_REPLY,
						PIN_CODE_REPLY_CP_SIZE, &pr);

	return;

error:
	hci_send_cmd(req->dev, OGF_LINK_CTL, OCF_PIN_CODE_NEG_REPLY,
							6, &req->bda);
}


static void free_pin_req(void *req)
{
	free(req);
}

void hcid_dbus_request_pin(int dev, struct hci_conn_info *ci)
{
	DBusMessage *message;
	DBusMessageIter iter;
	DBusPendingCall *pending = NULL;
	struct pin_request *req;

	message = dbus_message_new_method_call(SERVICE_NAME, PATH_NAME,
						INTERFACE_NAME, REQUEST_NAME);
	if (message == NULL) {
		syslog(LOG_ERR, "Couldn't allocate D-BUS message");
		goto failed;
	}

	req = malloc(sizeof(*req));
	req->dev = dev;
	bacpy(&req->bda, &ci->bdaddr);

	dbus_message_append_iter_init(message, &iter);

	dbus_message_iter_append_boolean(&iter, ci->out);
	dbus_message_iter_append_byte_array(&iter,
			(unsigned char *) &ci->bdaddr, sizeof(ci->bdaddr));

	if (dbus_connection_send_with_reply(connection, message,
						&pending, TIMEOUT) == FALSE) {
		syslog(LOG_ERR, "D-BUS send failed");
		goto failed;
	}

	dbus_pending_call_set_notify(pending, reply_handler_function,
							req, free_pin_req);

	dbus_connection_flush (connection);

	dbus_message_unref (message);

	return;

failed:
	dbus_message_unref (message);
	hci_send_cmd(dev, OGF_LINK_CTL, OCF_PIN_CODE_NEG_REPLY,
							6, &ci->bdaddr);
}

gboolean watch_func(GIOChannel *chan, GIOCondition cond, gpointer data)
{
	DBusWatch *watch = (DBusWatch *) data;
	int flags = 0;

	if (cond & G_IO_IN)  flags |= DBUS_WATCH_READABLE;
	if (cond & G_IO_OUT) flags |= DBUS_WATCH_WRITABLE;
	if (cond & G_IO_HUP) flags |= DBUS_WATCH_HANGUP;
	if (cond & G_IO_ERR) flags |= DBUS_WATCH_ERROR;

	dbus_watch_handle(watch, flags);

	dbus_connection_ref(connection);

	/* Dispatch messages */
	while (dbus_connection_dispatch(connection) == DBUS_DISPATCH_DATA_REMAINS);

	dbus_connection_unref(connection);

	return TRUE;
}

dbus_bool_t add_watch(DBusWatch *watch, void *data)
{
	GIOCondition cond = G_IO_HUP | G_IO_ERR;
	GIOChannel *io;
	guint id;
	int fd, flags;

	if (!dbus_watch_get_enabled(watch))
		return TRUE;

	fd = dbus_watch_get_fd(watch);
	io = g_io_channel_unix_new(fd);
	flags = dbus_watch_get_flags(watch);

	if (flags & DBUS_WATCH_READABLE) cond |= G_IO_IN;
	if (flags & DBUS_WATCH_WRITABLE) cond |= G_IO_OUT;

	id = g_io_add_watch(io, cond, watch_func, watch);

	dbus_watch_set_data(watch, (void *) id, NULL);

	return TRUE;
}

static void remove_watch(DBusWatch *watch, void *data)
{
	guint id = (guint) dbus_watch_get_data(watch);

	dbus_watch_set_data(watch, NULL, NULL);

	if (id)
		g_io_remove_watch(id);
}

static void watch_toggled(DBusWatch *watch, void *data)
{
	/* Because we just exit on OOM, enable/disable is
	 * no different from add/remove
	 */
	if (dbus_watch_get_enabled(watch))
		add_watch(watch, data);
	else
		remove_watch(watch, data);
}

gboolean hcid_dbus_init(void)
{
	DBusError error;

	dbus_error_init(&error);

	connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
	if (connection == NULL) {
		fprintf(stderr, "Failed to open connection to system message bus: %s\n",
			error.message);
		dbus_error_free(&error);
		return FALSE;
	}

	dbus_connection_set_watch_functions(connection,
		add_watch, remove_watch, watch_toggled, NULL, NULL);

	return TRUE;
}