blob: 5b2b775cd52ab41637ee34d10a0b6d151235e9d1 [file] [log] [blame]
/******************************************************************************
*
* Copyright (C) 2009-2012 Broadcom Corporation
*
* 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 "btif_sock_rfcomm"
#include <assert.h>
#include <errno.h>
#include <hardware/bluetooth.h>
#include <hardware/bt_sock.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include "bta_api.h"
#include "bt_target.h"
#include "bta_jv_api.h"
#include "bta_jv_co.h"
#include "btif_common.h"
#include "btif_sock_sdp.h"
#include "btif_sock_thread.h"
#include "btif_sock_util.h"
#include "btif_util.h"
#include "btm_api.h"
#include "btm_int.h"
#include "btu.h"
#include "gki.h"
#include "hcimsgs.h"
#include "list.h"
#include "osi.h"
#include "osi/include/log.h"
#include "port_api.h"
#include "sdp_api.h"
#define MAX_RFC_CHANNEL 30 // Maximum number of RFCOMM channels (1-30 inclusive).
#define MAX_RFC_SESSION 7 // Maximum number of devices we can have an RFCOMM connection with.
typedef struct {
int outgoing_congest : 1;
int pending_sdp_request : 1;
int doing_sdp_request : 1;
int server : 1;
int connected : 1;
int closing : 1;
} flags_t;
typedef struct {
flags_t f;
uint32_t id; // Non-zero indicates a valid (in-use) slot.
int security;
int scn; // Server channel number
bt_bdaddr_t addr;
uint8_t service_uuid[16];
char service_name[256];
int fd;
int app_fd; // Temporary storage for the half of the socketpair that's sent back to upper layers.
int mtu;
uint8_t *packet;
int sdp_handle;
int rfc_handle;
int rfc_port_handle;
int role;
list_t *incoming_queue;
} rfc_slot_t;
static rfc_slot_t rfc_slots[MAX_RFC_CHANNEL];
static uint32_t rfc_slot_id;
static volatile int pth = -1; // poll thread handle
static pthread_mutex_t slot_lock;
static rfc_slot_t *find_free_slot(void);
static void cleanup_rfc_slot(rfc_slot_t *rs);
static void jv_dm_cback(tBTA_JV_EVT event, tBTA_JV *p_data, void *user_data);
static void *rfcomm_cback(tBTA_JV_EVT event, tBTA_JV *p_data, void *user_data);
static bool send_app_scn(const rfc_slot_t *rs);
static bool is_init_done(void) {
return pth != -1;
}
bt_status_t btsock_rfc_init(int poll_thread_handle) {
pth = poll_thread_handle;
memset(rfc_slots, 0, sizeof(rfc_slots));
for (size_t i = 0; i < ARRAY_SIZE(rfc_slots); ++i) {
rfc_slots[i].scn = -1;
rfc_slots[i].sdp_handle = 0;
rfc_slots[i].fd = INVALID_FD;
rfc_slots[i].app_fd = INVALID_FD;
rfc_slots[i].incoming_queue = list_new(GKI_freebuf);
assert(rfc_slots[i].incoming_queue != NULL);
}
BTA_JvEnable(jv_dm_cback);
init_slot_lock(&slot_lock);
return BT_STATUS_SUCCESS;
}
void btsock_rfc_cleanup(void) {
pth = -1;
lock_slot(&slot_lock);
for (size_t i = 0; i < ARRAY_SIZE(rfc_slots); ++i) {
if (rfc_slots[i].id)
cleanup_rfc_slot(&rfc_slots[i]);
list_free(rfc_slots[i].incoming_queue);
}
unlock_slot(&slot_lock);
}
static rfc_slot_t *find_free_slot(void) {
for (size_t i = 0; i < ARRAY_SIZE(rfc_slots); ++i)
if (rfc_slots[i].fd == INVALID_FD)
return &rfc_slots[i];
return NULL;
}
static rfc_slot_t *find_rfc_slot_by_id(uint32_t id) {
assert(id != 0);
for (size_t i = 0; i < ARRAY_SIZE(rfc_slots); ++i)
if (rfc_slots[i].id == id)
return &rfc_slots[i];
LOG_ERROR("%s unable to find RFCOMM slot id: %d", __func__, id);
return NULL;
}
static rfc_slot_t *find_rfc_slot_by_pending_sdp(void) {
uint32_t min_id = UINT32_MAX;
int slot = -1;
for (size_t i = 0; i < ARRAY_SIZE(rfc_slots); ++i)
if (rfc_slots[i].id && rfc_slots[i].f.pending_sdp_request && rfc_slots[i].id < min_id) {
min_id = rfc_slots[i].id;
slot = i;
}
return (slot == -1) ? NULL : &rfc_slots[slot];
}
static bool is_requesting_sdp(void) {
for (size_t i = 0; i < ARRAY_SIZE(rfc_slots); ++i)
if (rfc_slots[i].id && rfc_slots[i].f.doing_sdp_request)
return true;
return false;
}
static rfc_slot_t *alloc_rfc_slot(const bt_bdaddr_t *addr, const char *name, const uint8_t *uuid, int channel, int flags, bool server) {
int security = 0;
if(flags & BTSOCK_FLAG_ENCRYPT)
security |= server ? BTM_SEC_IN_ENCRYPT : BTM_SEC_OUT_ENCRYPT;
if(flags & BTSOCK_FLAG_AUTH)
security |= server ? BTM_SEC_IN_AUTHENTICATE : BTM_SEC_OUT_AUTHENTICATE;
rfc_slot_t *slot = find_free_slot();
if (!slot) {
LOG_ERROR("%s unable to find free RFCOMM slot.", __func__);
return NULL;
}
int fds[2] = { INVALID_FD, INVALID_FD };
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) == -1) {
LOG_ERROR("%s error creating socketpair: %s", __func__, strerror(errno));
return NULL;
}
// Increment slot id and make sure we don't use id=0.
if (++rfc_slot_id == 0)
rfc_slot_id = 1;
slot->fd = fds[0];
slot->app_fd = fds[1];
slot->security = security;
slot->scn = channel;
if (uuid)
memcpy(slot->service_uuid, uuid, sizeof(slot->service_uuid));
else
memset(&slot->service_uuid, 0, sizeof(slot->service_uuid));
if (name)
strlcpy(slot->service_name, name, sizeof(slot->service_name));
if (addr)
slot->addr = *addr;
slot->id = rfc_slot_id;
slot->f.server = server;
return slot;
}
static rfc_slot_t *create_srv_accept_rfc_slot(rfc_slot_t *srv_rs, const bt_bdaddr_t *addr, int open_handle, int new_listen_handle) {
rfc_slot_t *accept_rs = alloc_rfc_slot(addr, srv_rs->service_name, srv_rs->service_uuid, srv_rs->scn, 0, false);
if (!accept_rs) {
LOG_ERROR("%s unable to allocate RFCOMM slot.", __func__);
return NULL;
}
accept_rs->f.server = false;
accept_rs->f.connected = true;
accept_rs->security = srv_rs->security;
accept_rs->mtu = srv_rs->mtu;
accept_rs->role = srv_rs->role;
accept_rs->rfc_handle = open_handle;
accept_rs->rfc_port_handle = BTA_JvRfcommGetPortHdl(open_handle);
srv_rs->rfc_handle = new_listen_handle;
srv_rs->rfc_port_handle = BTA_JvRfcommGetPortHdl(new_listen_handle);
assert(accept_rs->rfc_port_handle != srv_rs->rfc_port_handle);
// now swap the slot id
uint32_t new_listen_id = accept_rs->id;
accept_rs->id = srv_rs->id;
srv_rs->id = new_listen_id;
return accept_rs;
}
bt_status_t btsock_rfc_listen(const char *service_name, const uint8_t *service_uuid, int channel, int *sock_fd, int flags) {
assert(sock_fd != NULL);
assert(service_uuid != NULL || (channel >= 1 && channel <= MAX_RFC_CHANNEL));
*sock_fd = INVALID_FD;
// TODO(sharvil): not sure that this check makes sense; seems like a logic error to call
// functions on RFCOMM sockets before initializing the module. Probably should be an assert.
if (!is_init_done())
return BT_STATUS_NOT_READY;
if (!is_uuid_empty(service_uuid)) {
// Use a pre-defined channel # if the UUID is reserved.
int reserved_channel = get_reserved_rfc_channel(service_uuid);
if (reserved_channel != -1)
channel = reserved_channel;
} else {
service_uuid = UUID_SPP; // Use serial port profile to listen to specified channel
}
int status = BT_STATUS_FAIL;
lock_slot(&slot_lock);
rfc_slot_t *slot = alloc_rfc_slot(NULL, service_name, service_uuid, channel, flags, true);
if (!slot) {
LOG_ERROR("%s unable to allocate RFCOMM slot.", __func__);
goto out;
}
BTA_JvCreateRecordByUser((void *)(uintptr_t)slot->id);
*sock_fd = slot->app_fd; // Transfer ownership of fd to caller.
slot->app_fd = INVALID_FD; // Drop our reference to the fd.
btsock_thread_add_fd(pth, slot->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_EXCEPTION, slot->id);
status = BT_STATUS_SUCCESS;
out:;
unlock_slot(&slot_lock);
return status;
}
bt_status_t btsock_rfc_connect(const bt_bdaddr_t *bd_addr, const uint8_t *service_uuid, int channel, int *sock_fd, int flags) {
assert(sock_fd != NULL);
assert(service_uuid != NULL || (channel >= 1 && channel <= MAX_RFC_CHANNEL));
*sock_fd = INVALID_FD;
// TODO(sharvil): not sure that this check makes sense; seems like a logic error to call
// functions on RFCOMM sockets before initializing the module. Probably should be an assert.
if (!is_init_done())
return BT_STATUS_NOT_READY;
int status = BT_STATUS_FAIL;
lock_slot(&slot_lock);
rfc_slot_t *slot = alloc_rfc_slot(bd_addr, NULL, service_uuid, channel, flags, false);
if (!slot) {
LOG_ERROR("%s unable to allocate RFCOMM slot.", __func__);
goto out;
}
if (is_uuid_empty(service_uuid)) {
tBTA_JV_STATUS ret = BTA_JvRfcommConnect(slot->security, slot->role, slot->scn, slot->addr.address, rfcomm_cback, (void *)(uintptr_t)slot->id);
if (ret != BTA_JV_SUCCESS) {
LOG_ERROR("%s unable to initiate RFCOMM connection: %d", __func__, ret);
cleanup_rfc_slot(slot);
goto out;
}
if (!send_app_scn(slot)) {
LOG_ERROR("%s unable to send channel number.", __func__);
cleanup_rfc_slot(slot);
goto out;
}
} else {
tSDP_UUID sdp_uuid;
sdp_uuid.len = 16;
memcpy(sdp_uuid.uu.uuid128, service_uuid, sizeof(sdp_uuid.uu.uuid128));
if (!is_requesting_sdp()) {
BTA_JvStartDiscovery((uint8_t *)bd_addr->address, 1, &sdp_uuid, (void *)(uintptr_t)slot->id);
slot->f.pending_sdp_request = false;
slot->f.doing_sdp_request = true;
} else {
slot->f.pending_sdp_request = true;
slot->f.doing_sdp_request = false;
}
}
*sock_fd = slot->app_fd; // Transfer ownership of fd to caller.
slot->app_fd = INVALID_FD; // Drop our reference to the fd.
btsock_thread_add_fd(pth, slot->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_RD, slot->id);
status = BT_STATUS_SUCCESS;
out:;
unlock_slot(&slot_lock);
return status;
}
static int create_server_sdp_record(rfc_slot_t *slot) {
if (slot->scn > 0) {
if (!BTM_TryAllocateSCN(slot->scn)) {
LOG_ERROR("%s attempting to allocate fixed channel %d which is already in use.", __func__, slot->scn);
return false;
}
} else if ((slot->scn = BTM_AllocateSCN()) == 0) {
LOG_ERROR("%s unable to allocate RFCOMM server channel.", __func__);
return false;
}
slot->sdp_handle = add_rfc_sdp_rec(slot->service_name, slot->service_uuid, slot->scn);
return (slot->sdp_handle > 0);
}
static void free_rfc_slot_scn(rfc_slot_t *slot) {
if (slot->scn <= 0)
return;
if(slot->f.server && !slot->f.closing && slot->rfc_handle) {
BTA_JvRfcommStopServer(slot->rfc_handle, (void *)(uintptr_t)slot->id);
slot->rfc_handle = 0;
}
if (slot->f.server)
BTM_FreeSCN(slot->scn);
slot->scn = 0;
}
static void cleanup_rfc_slot(rfc_slot_t *slot) {
if (slot->fd != INVALID_FD) {
shutdown(slot->fd, SHUT_RDWR);
close(slot->fd);
slot->fd = INVALID_FD;
}
if (slot->app_fd != INVALID_FD) {
close(slot->app_fd);
slot->app_fd = INVALID_FD;
}
if (slot->sdp_handle > 0) {
del_rfc_sdp_rec(slot->sdp_handle);
slot->sdp_handle = 0;
}
if (slot->rfc_handle && !slot->f.closing && !slot->f.server) {
BTA_JvRfcommClose(slot->rfc_handle, (void *)(uintptr_t)slot->id);
slot->rfc_handle = 0;
}
free_rfc_slot_scn(slot);
list_clear(slot->incoming_queue);
slot->rfc_port_handle = 0;
memset(&slot->f, 0, sizeof(slot->f));
slot->id = 0;
}
static bool send_app_scn(const rfc_slot_t *slot) {
return sock_send_all(slot->fd, (const uint8_t*)&slot->scn, sizeof(slot->scn)) == sizeof(slot->scn);
}
static bool send_app_connect_signal(int fd, const bt_bdaddr_t* addr, int channel, int status, int send_fd) {
sock_connect_signal_t cs;
cs.size = sizeof(cs);
cs.bd_addr = *addr;
cs.channel = channel;
cs.status = status;
if (send_fd == INVALID_FD)
return sock_send_all(fd, (const uint8_t *)&cs, sizeof(cs)) == sizeof(cs);
return sock_send_fd(fd, (const uint8_t *)&cs, sizeof(cs), send_fd) == sizeof(cs);
}
static void on_cl_rfc_init(tBTA_JV_RFCOMM_CL_INIT *p_init, uint32_t id) {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (!slot)
goto out;
if (p_init->status == BTA_JV_SUCCESS)
slot->rfc_handle = p_init->handle;
else
cleanup_rfc_slot(slot);
out:;
unlock_slot(&slot_lock);
}
static void on_srv_rfc_listen_started(tBTA_JV_RFCOMM_START *p_start, uint32_t id) {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (!slot)
goto out;
if (p_start->status == BTA_JV_SUCCESS) {
slot->rfc_handle = p_start->handle;
if (!send_app_scn(slot)) {
LOG_ERROR("%s unable to send server channel number for slot %d.", __func__, slot->id);
cleanup_rfc_slot(slot);
}
} else
cleanup_rfc_slot(slot);
out:;
unlock_slot(&slot_lock);
}
static uint32_t on_srv_rfc_connect(tBTA_JV_RFCOMM_SRV_OPEN *p_open, uint32_t id) {
uint32_t new_listen_slot_id = 0;
lock_slot(&slot_lock);
rfc_slot_t *srv_rs = find_rfc_slot_by_id(id);
if (!srv_rs)
goto out;
rfc_slot_t *accept_rs = create_srv_accept_rfc_slot(srv_rs, (const bt_bdaddr_t *)p_open->rem_bda, p_open->handle, p_open->new_listen_handle);
if (!accept_rs)
goto out;
// Start monitoring the socket.
btsock_thread_add_fd(pth, srv_rs->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_EXCEPTION, srv_rs->id);
btsock_thread_add_fd(pth, accept_rs->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_RD, accept_rs->id);
send_app_connect_signal(srv_rs->fd, &accept_rs->addr, srv_rs->scn, 0, accept_rs->app_fd);
accept_rs->app_fd = INVALID_FD; // Ownership of the application fd has been transferred.
new_listen_slot_id = srv_rs->id;
out:;
unlock_slot(&slot_lock);
return new_listen_slot_id;
}
static void on_cli_rfc_connect(tBTA_JV_RFCOMM_OPEN *p_open, uint32_t id) {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (!slot)
goto out;
if (p_open->status != BTA_JV_SUCCESS) {
cleanup_rfc_slot(slot);
goto out;
}
slot->rfc_port_handle = BTA_JvRfcommGetPortHdl(p_open->handle);
memcpy(slot->addr.address, p_open->rem_bda, 6);
if (send_app_connect_signal(slot->fd, &slot->addr, slot->scn, 0, -1))
slot->f.connected = true;
else
LOG_ERROR("%s unable to send connect completion signal to caller.", __func__);
out:;
unlock_slot(&slot_lock);
}
static void on_rfc_close(UNUSED_ATTR tBTA_JV_RFCOMM_CLOSE *p_close, uint32_t id) {
lock_slot(&slot_lock);
// rfc_handle already closed when receiving rfcomm close event from stack.
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (slot)
cleanup_rfc_slot(slot);
unlock_slot(&slot_lock);
}
static void on_rfc_write_done(UNUSED_ATTR tBTA_JV_RFCOMM_WRITE *p, uint32_t id) {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (slot && !slot->f.outgoing_congest)
btsock_thread_add_fd(pth, slot->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_RD, slot->id);
unlock_slot(&slot_lock);
}
static void on_rfc_outgoing_congest(tBTA_JV_RFCOMM_CONG *p, uint32_t id) {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (slot) {
slot->f.outgoing_congest = p->cong ? 1 : 0;
if (!slot->f.outgoing_congest)
btsock_thread_add_fd(pth, slot->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_RD, slot->id);
}
unlock_slot(&slot_lock);
}
static void *rfcomm_cback(tBTA_JV_EVT event, tBTA_JV *p_data, void *user_data) {
void *new_user_data = NULL;
switch (event) {
case BTA_JV_RFCOMM_START_EVT:
on_srv_rfc_listen_started(&p_data->rfc_start, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_CL_INIT_EVT:
on_cl_rfc_init(&p_data->rfc_cl_init, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_OPEN_EVT:
BTA_JvSetPmProfile(p_data->rfc_open.handle,BTA_JV_PM_ID_1,BTA_JV_CONN_OPEN);
on_cli_rfc_connect(&p_data->rfc_open, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_SRV_OPEN_EVT:
BTA_JvSetPmProfile(p_data->rfc_srv_open.handle,BTA_JV_PM_ALL,BTA_JV_CONN_OPEN);
new_user_data = (void *)(uintptr_t)on_srv_rfc_connect(&p_data->rfc_srv_open, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_CLOSE_EVT:
APPL_TRACE_DEBUG("BTA_JV_RFCOMM_CLOSE_EVT: user_data:%d", (uintptr_t)user_data);
on_rfc_close(&p_data->rfc_close, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_WRITE_EVT:
on_rfc_write_done(&p_data->rfc_write, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_CONG_EVT:
on_rfc_outgoing_congest(&p_data->rfc_cong, (uintptr_t)user_data);
break;
case BTA_JV_RFCOMM_READ_EVT:
case BTA_JV_RFCOMM_DATA_IND_EVT:
// Unused.
break;
default:
LOG_ERROR("%s unhandled event %d, slot id: %d", __func__, event, (uintptr_t)user_data);
break;
}
return new_user_data;
}
static void jv_dm_cback(tBTA_JV_EVT event, tBTA_JV *p_data, void *user_data) {
uint32_t id = (uintptr_t)user_data;
switch(event) {
case BTA_JV_CREATE_RECORD_EVT: {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (slot && create_server_sdp_record(slot)) {
// Start the rfcomm server after sdp & channel # assigned.
BTA_JvRfcommStartServer(slot->security, slot->role, slot->scn, MAX_RFC_SESSION, rfcomm_cback, (void *)(uintptr_t)slot->id);
} else if(slot) {
APPL_TRACE_ERROR("jv_dm_cback: cannot start server, slot found:%p", slot);
cleanup_rfc_slot(slot);
}
unlock_slot(&slot_lock);
break;
}
case BTA_JV_DISCOVERY_COMP_EVT: {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (p_data->disc_comp.status == BTA_JV_SUCCESS && p_data->disc_comp.scn) {
if (slot && slot->f.doing_sdp_request) {
// Establish the connection if we successfully looked up a channel number to connect to.
if (BTA_JvRfcommConnect(slot->security, slot->role, p_data->disc_comp.scn, slot->addr.address, rfcomm_cback, (void *)(uintptr_t)slot->id) == BTA_JV_SUCCESS) {
slot->scn = p_data->disc_comp.scn;
slot->f.doing_sdp_request = false;
if (!send_app_scn(slot))
cleanup_rfc_slot(slot);
} else {
cleanup_rfc_slot(slot);
}
} else if (slot) {
// TODO(sharvil): this is really a logic error and we should probably assert.
LOG_ERROR("%s SDP response returned but RFCOMM slot %d did not request SDP record.", __func__, id);
}
} else if (slot) {
cleanup_rfc_slot(slot);
}
// Find the next slot that needs to perform an SDP request and service it.
slot = find_rfc_slot_by_pending_sdp();
if (slot) {
tSDP_UUID sdp_uuid;
sdp_uuid.len = 16;
memcpy(sdp_uuid.uu.uuid128, slot->service_uuid, sizeof(sdp_uuid.uu.uuid128));
BTA_JvStartDiscovery((uint8_t *)slot->addr.address, 1, &sdp_uuid, (void *)(uintptr_t)slot->id);
slot->f.pending_sdp_request = false;
slot->f.doing_sdp_request = true;
}
unlock_slot(&slot_lock);
break;
}
default:
APPL_TRACE_DEBUG("unhandled event:%d, slot id:%d", event, id);
break;
}
}
typedef enum {
SENT_FAILED,
SENT_NONE,
SENT_PARTIAL,
SENT_ALL,
} sent_status_t;
static sent_status_t send_data_to_app(int fd, BT_HDR *p_buf) {
if (p_buf->len == 0)
return SENT_ALL;
ssize_t sent = send(fd, p_buf->data + p_buf->offset, p_buf->len, MSG_DONTWAIT);
if (sent == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
return SENT_NONE;
LOG_ERROR("%s error writing RFCOMM data back to app: %s", __func__, strerror(errno));
return SENT_FAILED;
}
if (sent == 0)
return SENT_FAILED;
if (sent == p_buf->len)
return SENT_ALL;
p_buf->offset += sent;
p_buf->len -= sent;
return SENT_PARTIAL;
}
static bool flush_incoming_que_on_wr_signal(rfc_slot_t *slot) {
while (!list_is_empty(slot->incoming_queue)) {
BT_HDR *p_buf = list_front(slot->incoming_queue);
switch (send_data_to_app(slot->fd, p_buf)) {
case SENT_NONE:
case SENT_PARTIAL:
//monitor the fd to get callback when app is ready to receive data
btsock_thread_add_fd(pth, slot->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_WR, slot->id);
return true;
case SENT_ALL:
list_remove(slot->incoming_queue, p_buf);
break;
case SENT_FAILED:
list_remove(slot->incoming_queue, p_buf);
return false;
}
}
//app is ready to receive data, tell stack to start the data flow
//fix me: need a jv flow control api to serialize the call in stack
APPL_TRACE_DEBUG("enable data flow, rfc_handle:0x%x, rfc_port_handle:0x%x, user_id:%d",
slot->rfc_handle, slot->rfc_port_handle, slot->id);
extern int PORT_FlowControl_MaxCredit(uint16_t handle, bool enable);
PORT_FlowControl_MaxCredit(slot->rfc_port_handle, true);
return true;
}
void btsock_rfc_signaled(UNUSED_ATTR int fd, int flags, uint32_t user_id) {
lock_slot(&slot_lock);
rfc_slot_t *slot = find_rfc_slot_by_id(user_id);
if (!slot)
goto out;
bool need_close = false;
// Data available from app, tell stack we have outgoing data.
if (flags & SOCK_THREAD_FD_RD && !slot->f.server) {
if (slot->f.connected) {
// Make sure there's data pending in case the peer closed the socket.
int size = 0;
if (!(flags & SOCK_THREAD_FD_EXCEPTION) || (ioctl(slot->fd, FIONREAD, &size) == 0 && size))
BTA_JvRfcommWrite(slot->rfc_handle, slot->id);
} else {
LOG_ERROR("%s socket signaled for read while disconnected, slot: %d, channel: %d", __func__, slot->id, slot->scn);
need_close = true;
}
}
if (flags & SOCK_THREAD_FD_WR) {
// App is ready to receive more data, tell stack to enable data flow.
if (!slot->f.connected || !flush_incoming_que_on_wr_signal(slot)) {
LOG_ERROR("%s socket signaled for write while disconnected (or write failure), slot: %d, channel: %d", __func__, slot->id, slot->scn);
need_close = true;
}
}
if (need_close || (flags & SOCK_THREAD_FD_EXCEPTION)) {
// Clean up if there's no data pending.
int size = 0;
if (need_close || ioctl(slot->fd, FIONREAD, &size) != 0 || !size)
cleanup_rfc_slot(slot);
}
out:;
unlock_slot(&slot_lock);
}
int bta_co_rfc_data_incoming(void *user_data, BT_HDR *p_buf) {
lock_slot(&slot_lock);
int ret = 0;
uint32_t id = (uintptr_t)user_data;
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (!slot)
goto out;
if (list_is_empty(slot->incoming_queue)) {
switch (send_data_to_app(slot->fd, p_buf)) {
case SENT_NONE:
case SENT_PARTIAL:
list_append(slot->incoming_queue, p_buf);
btsock_thread_add_fd(pth, slot->fd, BTSOCK_RFCOMM, SOCK_THREAD_FD_WR, slot->id);
break;
case SENT_ALL:
GKI_freebuf(p_buf);
ret = 1; // Enable data flow.
break;
case SENT_FAILED:
GKI_freebuf(p_buf);
cleanup_rfc_slot(slot);
break;
}
} else {
list_append(slot->incoming_queue, p_buf);
}
out:;
unlock_slot(&slot_lock);
return ret; // Return 0 to disable data flow.
}
int bta_co_rfc_data_outgoing_size(void *user_data, int *size) {
lock_slot(&slot_lock);
uint32_t id = (uintptr_t)user_data;
int ret = false;
*size = 0;
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (!slot)
goto out;
if (ioctl(slot->fd, FIONREAD, size) == 0) {
ret = true;
} else {
LOG_ERROR("%s unable to determine bytes remaining to be read on fd %d: %s", __func__, slot->fd, strerror(errno));
cleanup_rfc_slot(slot);
}
out:;
unlock_slot(&slot_lock);
return ret;
}
int bta_co_rfc_data_outgoing(void *user_data, uint8_t *buf, uint16_t size) {
lock_slot(&slot_lock);
uint32_t id = (uintptr_t)user_data;
int ret = false;
rfc_slot_t *slot = find_rfc_slot_by_id(id);
if (!slot)
goto out;
int received = recv(slot->fd, buf, size, 0);
if(received == size) {
ret = true;
} else {
LOG_ERROR("%s error receiving RFCOMM data from app: %s", __func__, strerror(errno));
cleanup_rfc_slot(slot);
}
out:;
unlock_slot(&slot_lock);
return ret;
}