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/******************************************************************************
*
* Copyright (C) 2014 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#define LOG_TAG "bt_hci_inject"
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "osi/include/allocator.h"
#include "bt_types.h"
#include "buffer_allocator.h"
#include "hci_inject.h"
#include "hci_layer.h"
#include "osi/include/list.h"
#include "osi/include/osi.h"
#include "osi/include/log.h"
#include "osi/include/socket.h"
#include "osi/include/thread.h"
typedef enum {
HCI_PACKET_COMMAND = 1,
HCI_PACKET_ACL_DATA = 2,
HCI_PACKET_SCO_DATA = 3,
HCI_PACKET_EVENT = 4,
} hci_packet_t;
typedef struct {
socket_t *socket;
uint8_t buffer[65536 + 3]; // 2 bytes length prefix, 1 byte type prefix.
size_t buffer_size;
} client_t;
static const port_t LISTEN_PORT = 8873;
static const hci_inject_t interface;
static const hci_t *hci;
static const allocator_t *buffer_allocator;
static socket_t *listen_socket;
static thread_t *thread;
static list_t *clients;
static int hci_packet_to_event(hci_packet_t packet);
static void accept_ready(socket_t *socket, void *context);
static void read_ready(socket_t *socket, void *context);
static void client_free(void *ptr);
bool hci_inject_open(const hci_t *hci_interface) {
#if (!defined(BT_NET_DEBUG) || (BT_NET_DEBUG != TRUE))
return true; // Disable using network sockets for security reasons
#endif
assert(listen_socket == NULL);
assert(thread == NULL);
assert(clients == NULL);
assert(hci_interface != NULL);
hci = hci_interface;
thread = thread_new("hci_inject");
if (!thread)
goto error;
clients = list_new(client_free);
if (!clients)
goto error;
listen_socket = socket_new();
if (!listen_socket)
goto error;
if (!socket_listen(listen_socket, LISTEN_PORT))
goto error;
socket_register(listen_socket, thread_get_reactor(thread), NULL, accept_ready, NULL);
return true;
error:;
interface.close();
return false;
}
void hci_inject_close(void) {
#if (!defined(BT_NET_DEBUG) || (BT_NET_DEBUG != TRUE))
return; // Disable using network sockets for security reasons
#endif
socket_free(listen_socket);
list_free(clients);
thread_free(thread);
listen_socket = NULL;
thread = NULL;
clients = NULL;
}
static int hci_packet_to_event(hci_packet_t packet) {
switch (packet) {
case HCI_PACKET_COMMAND:
return MSG_STACK_TO_HC_HCI_CMD;
case HCI_PACKET_ACL_DATA:
return MSG_STACK_TO_HC_HCI_ACL;
case HCI_PACKET_SCO_DATA:
return MSG_STACK_TO_HC_HCI_SCO;
default:
LOG_ERROR("%s unsupported packet type: %d", __func__, packet);
return -1;
}
}
static void accept_ready(socket_t *socket, UNUSED_ATTR void *context) {
assert(socket != NULL);
assert(socket == listen_socket);
socket = socket_accept(socket);
if (!socket)
return;
client_t *client = (client_t *)osi_calloc(sizeof(client_t));
if (!client) {
LOG_ERROR("%s unable to allocate memory for client.", __func__);
socket_free(socket);
return;
}
client->socket = socket;
if (!list_append(clients, client)) {
LOG_ERROR("%s unable to add client to list.", __func__);
client_free(client);
return;
}
socket_register(socket, thread_get_reactor(thread), client, read_ready, NULL);
}
static void read_ready(UNUSED_ATTR socket_t *socket, void *context) {
assert(socket != NULL);
assert(context != NULL);
client_t *client = (client_t *)context;
ssize_t ret = socket_read(client->socket, client->buffer + client->buffer_size, sizeof(client->buffer) - client->buffer_size);
if (ret == 0 || (ret == -1 && ret != EWOULDBLOCK && ret != EAGAIN)) {
list_remove(clients, client);
return;
}
client->buffer_size += ret;
while (client->buffer_size > 3) {
uint8_t *buffer = client->buffer;
hci_packet_t packet_type = (hci_packet_t)buffer[0];
size_t packet_len = (buffer[2] << 8) | buffer[1];
size_t frame_len = 3 + packet_len;
if (client->buffer_size < frame_len)
break;
// TODO(sharvil): validate incoming HCI messages.
// TODO(sharvil): once we have an HCI parser, we can eliminate
// the 2-byte size field since it will be contained in the packet.
BT_HDR *buf = (BT_HDR *)buffer_allocator->alloc(BT_HDR_SIZE + packet_len);
if (buf) {
buf->event = hci_packet_to_event(packet_type);
buf->offset = 0;
buf->layer_specific = 0;
buf->len = packet_len;
memcpy(buf->data, buffer + 3, packet_len);
hci->transmit_downward(buf->event, buf);
} else {
LOG_ERROR("%s dropping injected packet of length %zu", __func__, packet_len);
}
size_t remainder = client->buffer_size - frame_len;
memmove(buffer, buffer + frame_len, remainder);
client->buffer_size -= frame_len;
}
}
static void client_free(void *ptr) {
if (!ptr)
return;
client_t *client = (client_t *)ptr;
socket_free(client->socket);
osi_free(client);
}
static const hci_inject_t interface = {
hci_inject_open,
hci_inject_close
};
const hci_inject_t *hci_inject_get_interface() {
buffer_allocator = buffer_allocator_get_interface();
return &interface;
}
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