/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "bsp/bsp.h"
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#include "host/ble_hs.h"
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#include "host/ble_uuid.h"
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#include "bleprph.h"
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/**
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* The vendor specific security test service consists of two characteristics:
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* o random-number-generator: generates a random 32-bit number each time
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* it is read. This characteristic can only be read over an encrypted
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* connection.
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* o static-value: a single-byte characteristic that can always be read,
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* but can only be written over an encrypted connection.
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*/
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/* 59462f12-9543-9999-12c8-58b459a2712d */
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static const ble_uuid128_t gatt_svr_svc_sec_test_uuid =
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BLE_UUID128_INIT(0x2d, 0x71, 0xa2, 0x59, 0xb4, 0x58, 0xc8, 0x12,
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0x99, 0x99, 0x43, 0x95, 0x12, 0x2f, 0x46, 0x59);
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/* 5c3a659e-897e-45e1-b016-007107c96df6 */
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static const ble_uuid128_t gatt_svr_chr_sec_test_rand_uuid =
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BLE_UUID128_INIT(0xf6, 0x6d, 0xc9, 0x07, 0x71, 0x00, 0x16, 0xb0,
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0xe1, 0x45, 0x7e, 0x89, 0x9e, 0x65, 0x3a, 0x5c);
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/* 5c3a659e-897e-45e1-b016-007107c96df7 */
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static const ble_uuid128_t gatt_svr_chr_sec_test_static_uuid =
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BLE_UUID128_INIT(0xf7, 0x6d, 0xc9, 0x07, 0x71, 0x00, 0x16, 0xb0,
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0xe1, 0x45, 0x7e, 0x89, 0x9e, 0x65, 0x3a, 0x5c);
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static uint8_t gatt_svr_sec_test_static_val;
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static int
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gatt_svr_chr_access_sec_test(uint16_t conn_handle, uint16_t attr_handle,
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struct ble_gatt_access_ctxt *ctxt,
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void *arg);
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static const struct ble_gatt_svc_def gatt_svr_svcs[] = {
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{
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/*** Service: Security test. */
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.type = BLE_GATT_SVC_TYPE_PRIMARY,
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.uuid = &gatt_svr_svc_sec_test_uuid.u,
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.characteristics = (struct ble_gatt_chr_def[]) { {
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/*** Characteristic: Random number generator. */
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.uuid = &gatt_svr_chr_sec_test_rand_uuid.u,
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.access_cb = gatt_svr_chr_access_sec_test,
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.flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_READ_ENC,
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}, {
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/*** Characteristic: Static value. */
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.uuid = &gatt_svr_chr_sec_test_static_uuid.u,
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.access_cb = gatt_svr_chr_access_sec_test,
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.flags = BLE_GATT_CHR_F_READ |
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BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_WRITE_ENC,
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}, {
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0, /* No more characteristics in this service. */
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} },
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},
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{
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0, /* No more services. */
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},
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};
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static int
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gatt_svr_chr_write(struct os_mbuf *om, uint16_t min_len, uint16_t max_len,
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void *dst, uint16_t *len)
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{
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uint16_t om_len;
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int rc;
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om_len = OS_MBUF_PKTLEN(om);
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if (om_len < min_len || om_len > max_len) {
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return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
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}
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rc = ble_hs_mbuf_to_flat(om, dst, max_len, len);
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if (rc != 0) {
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return BLE_ATT_ERR_UNLIKELY;
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}
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return 0;
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}
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static int
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gatt_svr_chr_access_sec_test(uint16_t conn_handle, uint16_t attr_handle,
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struct ble_gatt_access_ctxt *ctxt,
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void *arg)
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{
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const ble_uuid_t *uuid;
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int rand_num;
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int rc;
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uuid = ctxt->chr->uuid;
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/* Determine which characteristic is being accessed by examining its
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* 128-bit UUID.
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*/
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if (ble_uuid_cmp(uuid, &gatt_svr_chr_sec_test_rand_uuid.u) == 0) {
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assert(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR);
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/* Respond with a 32-bit random number. */
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rand_num = rand();
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rc = os_mbuf_append(ctxt->om, &rand_num, sizeof rand_num);
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return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
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}
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if (ble_uuid_cmp(uuid, &gatt_svr_chr_sec_test_static_uuid.u) == 0) {
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switch (ctxt->op) {
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case BLE_GATT_ACCESS_OP_READ_CHR:
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rc = os_mbuf_append(ctxt->om, &gatt_svr_sec_test_static_val,
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sizeof gatt_svr_sec_test_static_val);
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return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
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case BLE_GATT_ACCESS_OP_WRITE_CHR:
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rc = gatt_svr_chr_write(ctxt->om,
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sizeof gatt_svr_sec_test_static_val,
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sizeof gatt_svr_sec_test_static_val,
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&gatt_svr_sec_test_static_val, NULL);
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return rc;
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default:
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assert(0);
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return BLE_ATT_ERR_UNLIKELY;
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}
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}
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/* Unknown characteristic; the nimble stack should not have called this
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* function.
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*/
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assert(0);
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return BLE_ATT_ERR_UNLIKELY;
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}
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void
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gatt_svr_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg)
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{
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char buf[BLE_UUID_STR_LEN];
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switch (ctxt->op) {
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case BLE_GATT_REGISTER_OP_SVC:
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MODLOG_DFLT(DEBUG, "registered service %s with handle=%d\n",
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ble_uuid_to_str(ctxt->svc.svc_def->uuid, buf),
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ctxt->svc.handle);
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break;
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case BLE_GATT_REGISTER_OP_CHR:
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MODLOG_DFLT(DEBUG, "registering characteristic %s with "
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"def_handle=%d val_handle=%d\n",
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ble_uuid_to_str(ctxt->chr.chr_def->uuid, buf),
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ctxt->chr.def_handle,
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ctxt->chr.val_handle);
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break;
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case BLE_GATT_REGISTER_OP_DSC:
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MODLOG_DFLT(DEBUG, "registering descriptor %s with handle=%d\n",
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ble_uuid_to_str(ctxt->dsc.dsc_def->uuid, buf),
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ctxt->dsc.handle);
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break;
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default:
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assert(0);
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break;
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}
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}
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int
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gatt_svr_init(void)
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{
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int rc;
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rc = ble_gatts_count_cfg(gatt_svr_svcs);
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if (rc != 0) {
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return rc;
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}
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rc = ble_gatts_add_svcs(gatt_svr_svcs);
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if (rc != 0) {
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return rc;
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}
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return 0;
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}
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