bta/ag/bta_ag_rfc.cc

/******************************************************************************
 *
 *  Copyright 2004-2012 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.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This file contains the audio gateway functions controlling the RFCOMM
 *  connections.
 *
 ******************************************************************************/

#include <base/functional/bind.h>
#include <bluetooth/log.h>

#include <cstdint>

#include "bta/ag/bta_ag_int.h"
#include "bta/include/bta_sec_api.h"
#include "bta_api.h"
#include "os/logging/log_adapter.h"
#include "stack/include/main_thread.h"
#include "stack/include/port_api.h"
#include "types/raw_address.h"

/* Event mask for RfCOMM port callback */
#define BTA_AG_PORT_EV_MASK PORT_EV_RXCHAR

using namespace bluetooth;

/* each scb has its own rfcomm callbacks */
static void bta_ag_port_cback_1(uint32_t code, uint16_t port_handle);
static void bta_ag_port_cback_2(uint32_t code, uint16_t port_handle);
static void bta_ag_port_cback_3(uint32_t code, uint16_t port_handle);
static void bta_ag_port_cback_4(uint32_t code, uint16_t port_handle);
static void bta_ag_port_cback_5(uint32_t code, uint16_t port_handle);
static void bta_ag_port_cback_6(uint32_t code, uint16_t port_handle);
static void bta_ag_mgmt_cback_1(const tPORT_RESULT code, uint16_t port_handle);
static void bta_ag_mgmt_cback_2(const tPORT_RESULT code, uint16_t port_handle);
static void bta_ag_mgmt_cback_3(const tPORT_RESULT code, uint16_t port_handle);
static void bta_ag_mgmt_cback_4(const tPORT_RESULT code, uint16_t port_handle);
static void bta_ag_mgmt_cback_5(const tPORT_RESULT code, uint16_t port_handle);
static void bta_ag_mgmt_cback_6(const tPORT_RESULT code, uint16_t port_handle);

/* rfcomm callback function tables */
typedef tPORT_CALLBACK* tBTA_AG_PORT_CBACK;
static const tBTA_AG_PORT_CBACK bta_ag_port_cback_tbl[] = {
        bta_ag_port_cback_1, bta_ag_port_cback_2, bta_ag_port_cback_3,
        bta_ag_port_cback_4, bta_ag_port_cback_5, bta_ag_port_cback_6};

typedef tPORT_MGMT_CALLBACK* tBTA_AG_PORT_MGMT_CBACK;
static const tBTA_AG_PORT_MGMT_CBACK bta_ag_mgmt_cback_tbl[] = {
        bta_ag_mgmt_cback_1, bta_ag_mgmt_cback_2, bta_ag_mgmt_cback_3,
        bta_ag_mgmt_cback_4, bta_ag_mgmt_cback_5, bta_ag_mgmt_cback_6};

/*******************************************************************************
 *
 * Function         bta_ag_port_cback
 *
 * Description      RFCOMM Port callback
 *
 *
 * Returns          void
 *
 ******************************************************************************/
static void bta_ag_port_cback(uint32_t /* code */, uint16_t port_handle, uint16_t handle) {
  tBTA_AG_SCB* p_scb = bta_ag_scb_by_idx(handle);
  if (p_scb != nullptr) {
    /* ignore port events for port handles other than connected handle */
    if (port_handle != p_scb->conn_handle) {
      log::error("ag_port_cback ignoring handle:{} conn_handle = {} other handle = {}", port_handle,
                 p_scb->conn_handle, handle);
      return;
    }
    if (!bta_ag_scb_open(p_scb)) {
      log::error("rfcomm data on an unopened control block {} peer_addr {} state {}", handle,
                 p_scb->peer_addr, bta_ag_state_str(p_scb->state));
    }
    do_in_main_thread(base::BindOnce(&bta_ag_sm_execute_by_handle, handle, BTA_AG_RFC_DATA_EVT,
                                     tBTA_AG_DATA::kEmpty));
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_mgmt_cback
 *
 * Description      RFCOMM management callback
 *
 *
 * Returns          void
 *
 ******************************************************************************/
static void bta_ag_mgmt_cback(const tPORT_RESULT code, uint16_t port_handle, uint16_t handle) {
  tBTA_AG_SCB* p_scb = bta_ag_scb_by_idx(handle);
  log::verbose("code={}, port_handle={}, scb_handle={}, p_scb=0x{}", code, port_handle, handle,
               std::format_ptr(p_scb));
  if (p_scb == nullptr) {
    log::warn("cannot find scb, code={}, port_handle={}, handle={}", code, port_handle, handle);
    return;
  }
  /* ignore close event for port handles other than connected handle */
  if ((code != PORT_SUCCESS) && (port_handle != p_scb->conn_handle)) {
    log::warn("ignore open failure for unmatched port_handle {}, scb_handle={}", port_handle,
              handle);
    return;
  }
  uint16_t event;
  if (code == PORT_SUCCESS) {
    bool found_handle = false;
    if (p_scb->conn_handle) {
      /* Outgoing connection */
      if (port_handle == p_scb->conn_handle) {
        found_handle = true;
      }
    } else {
      /* Incoming connection */
      for (uint16_t service_port_handle : p_scb->serv_handle) {
        if (port_handle == service_port_handle) {
          found_handle = true;
          break;
        }
      }
    }
    if (!found_handle) {
      log::error("port opened successfully, but port_handle {} is unknown, scb_handle={}",
                 port_handle, handle);
      return;
    }
    event = BTA_AG_RFC_OPEN_EVT;
  } else if (port_handle == p_scb->conn_handle) {
    /* distinguish server close events */
    event = BTA_AG_RFC_CLOSE_EVT;
  } else {
    event = BTA_AG_RFC_SRV_CLOSE_EVT;
  }

  tBTA_AG_DATA data = {};
  data.rfc.port_handle = port_handle;
  do_in_main_thread(base::BindOnce(&bta_ag_sm_execute_by_handle, handle, event, data));
}

/*******************************************************************************
 *
 * Function         bta_ag_port_cback_1 to 6
 *                  bta_ag_mgmt_cback_1 to 6
 *
 * Description      RFCOMM callback functions.  This is an easy way to
 *                  distinguish scb from the callback.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
static void bta_ag_mgmt_cback_1(const tPORT_RESULT code, uint16_t port_handle) {
  bta_ag_mgmt_cback(code, port_handle, 1);
}
static void bta_ag_mgmt_cback_2(const tPORT_RESULT code, uint16_t port_handle) {
  bta_ag_mgmt_cback(code, port_handle, 2);
}
static void bta_ag_mgmt_cback_3(const tPORT_RESULT code, uint16_t port_handle) {
  bta_ag_mgmt_cback(code, port_handle, 3);
}
static void bta_ag_mgmt_cback_4(const tPORT_RESULT code, uint16_t port_handle) {
  bta_ag_mgmt_cback(code, port_handle, 4);
}
static void bta_ag_mgmt_cback_5(const tPORT_RESULT code, uint16_t port_handle) {
  bta_ag_mgmt_cback(code, port_handle, 5);
}
static void bta_ag_mgmt_cback_6(const tPORT_RESULT code, uint16_t port_handle) {
  bta_ag_mgmt_cback(code, port_handle, 6);
}
static void bta_ag_port_cback_1(uint32_t code, uint16_t port_handle) {
  bta_ag_port_cback(code, port_handle, 1);
}
static void bta_ag_port_cback_2(uint32_t code, uint16_t port_handle) {
  bta_ag_port_cback(code, port_handle, 2);
}
static void bta_ag_port_cback_3(uint32_t code, uint16_t port_handle) {
  bta_ag_port_cback(code, port_handle, 3);
}
static void bta_ag_port_cback_4(uint32_t code, uint16_t port_handle) {
  bta_ag_port_cback(code, port_handle, 4);
}
static void bta_ag_port_cback_5(uint32_t code, uint16_t port_handle) {
  bta_ag_port_cback(code, port_handle, 5);
}
static void bta_ag_port_cback_6(uint32_t code, uint16_t port_handle) {
  bta_ag_port_cback(code, port_handle, 6);
}

/*******************************************************************************
 *
 * Function         bta_ag_setup_port
 *
 * Description      Setup RFCOMM port for use by AG.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
static void bta_ag_setup_port(tBTA_AG_SCB* p_scb, uint16_t handle) {
  int port_callback_index = bta_ag_scb_to_idx(p_scb) - 1;
  log::assert_that(port_callback_index >= 0, "invalid callback index, handle={}, bd_addr={}",
                   handle, ADDRESS_TO_LOGGABLE_STR(p_scb->peer_addr));
  log::assert_that(port_callback_index < static_cast<int>(sizeof(bta_ag_port_cback_tbl) /
                                                          sizeof(bta_ag_port_cback_tbl[0])),
                   "callback index out of bound, handle={}, bd_addr={}", handle,
                   ADDRESS_TO_LOGGABLE_STR(p_scb->peer_addr));
  if (PORT_SetEventMaskAndCallback(handle, BTA_AG_PORT_EV_MASK,
                                   bta_ag_port_cback_tbl[port_callback_index]) != PORT_SUCCESS) {
    log::warn("Unable to set RFCOMM event and callback mask peer:{} handle:{}", p_scb->peer_addr,
              handle);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_start_servers
 *
 * Description      Setup RFCOMM servers for use by AG.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_start_servers(tBTA_AG_SCB* p_scb, tBTA_SERVICE_MASK services) {
  services >>= BTA_HSP_SERVICE_ID;
  for (int i = 0; i < BTA_AG_NUM_IDX && services != 0; i++, services >>= 1) {
    /* if service is set in mask */
    if (services & 1) {
      int management_callback_index = bta_ag_scb_to_idx(p_scb) - 1;
      log::assert_that(management_callback_index >= 0,
                       "invalid callback index, services=0x{:x}, bd_addr={}", services,
                       ADDRESS_TO_LOGGABLE_STR(p_scb->peer_addr));
      log::assert_that(
              management_callback_index < static_cast<int>(sizeof(bta_ag_mgmt_cback_tbl) /
                                                           sizeof(bta_ag_mgmt_cback_tbl[0])),
              "callback index out of bound, services=0x{:x}, bd_addr={}", services,
              ADDRESS_TO_LOGGABLE_STR(p_scb->peer_addr));
      int status = RFCOMM_CreateConnectionWithSecurity(
              bta_ag_uuid[i], bta_ag_cb.profile[i].scn, true, BTA_AG_MTU, RawAddress::kAny,
              &(p_scb->serv_handle[i]), bta_ag_mgmt_cback_tbl[management_callback_index],
              BTA_SEC_AUTHENTICATE | BTA_SEC_ENCRYPT);
      if (status == PORT_SUCCESS) {
        bta_ag_setup_port(p_scb, p_scb->serv_handle[i]);
      } else {
        /* TODO: CR#137125 to handle to error properly */
        log::error(
                "RFCOMM_CreateConnectionWithSecurity ERROR {}, p_scb={}, "
                "services=0x{:x}, mgmt_cback_index={}",
                status, std::format_ptr(p_scb), services, management_callback_index);
      }
      log::verbose("p_scb=0x{}, services=0x{:04x}, mgmt_cback_index={}", std::format_ptr(p_scb),
                   services, management_callback_index);
    }
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_close_servers
 *
 * Description      Close RFCOMM servers port for use by AG.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_close_servers(tBTA_AG_SCB* p_scb, tBTA_SERVICE_MASK services) {
  services >>= BTA_HSP_SERVICE_ID;
  for (int i = 0; i < BTA_AG_NUM_IDX && services != 0; i++, services >>= 1) {
    /* if service is set in mask */
    if (services & 1) {
      if (RFCOMM_RemoveServer(p_scb->serv_handle[i]) != PORT_SUCCESS) {
        log::warn("Unable to remove RFCOMM server service:0x{:x}", services);
      }
      p_scb->serv_handle[i] = 0;
    }
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_is_server_closed
 *
 * Description      Returns true if all servers are closed.
 *
 *
 * Returns          true if all servers are closed, false otherwise
 *
 ******************************************************************************/
bool bta_ag_is_server_closed(tBTA_AG_SCB* p_scb) {
  uint8_t xx;
  bool is_closed = true;

  for (xx = 0; xx < BTA_AG_NUM_IDX; xx++) {
    if (p_scb->serv_handle[xx] != 0) {
      is_closed = false;
    }
  }

  return is_closed;
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_do_open
 *
 * Description      Open an RFCOMM connection to the peer device.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_do_open(tBTA_AG_SCB* p_scb, const tBTA_AG_DATA& data) {
  int management_callback_index = bta_ag_scb_to_idx(p_scb) - 1;
  int status = RFCOMM_CreateConnectionWithSecurity(
          bta_ag_uuid[p_scb->conn_service], p_scb->peer_scn, false, BTA_AG_MTU, p_scb->peer_addr,
          &(p_scb->conn_handle), bta_ag_mgmt_cback_tbl[management_callback_index],
          BTA_SEC_AUTHENTICATE | BTA_SEC_ENCRYPT);
  log::verbose("p_scb=0x{}, conn_handle={}, mgmt_cback_index={}, status={}", std::format_ptr(p_scb),
               p_scb->conn_handle, management_callback_index, status);
  if (status == PORT_SUCCESS) {
    bta_ag_setup_port(p_scb, p_scb->conn_handle);
  } else {
    /* RFCOMM create connection failed; send ourselves RFCOMM close event */
    log::error("RFCOMM_CreateConnection ERROR {} for {}", status, p_scb->peer_addr);
    bta_ag_sm_execute(p_scb, BTA_AG_RFC_CLOSE_EVT, data);
  }
}

/*******************************************************************************
 *
 * Function         bta_ag_rfc_do_close
 *
 * Description      Close RFCOMM connection.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_ag_rfc_do_close(tBTA_AG_SCB* p_scb, const tBTA_AG_DATA& /* data */) {
  log::info("p_scb->conn_handle: 0x{:04x}", p_scb->conn_handle);
  if (p_scb->conn_handle) {
    if (RFCOMM_RemoveConnection(p_scb->conn_handle) != PORT_SUCCESS) {
      log::warn("Unable to remove RFCOMM connection handle:0x{:04x}", p_scb->conn_handle);
    }
  } else {
    /* Close API was called while AG is in Opening state.               */
    /* Need to trigger the state machine to send callback to the app    */
    /* and move back to INIT state.                                     */
    do_in_main_thread(base::BindOnce(&bta_ag_sm_execute_by_handle, bta_ag_scb_to_idx(p_scb),
                                     BTA_AG_RFC_CLOSE_EVT, tBTA_AG_DATA::kEmpty));

    /* Cancel SDP if it had been started. */
    /*
    if(p_scb->p_disc_db)
    {
        (void)SDP_CancelServiceSearch (p_scb->p_disc_db);
    }
    */
  }
}