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* BlueZ - Bluetooth protocol stack for Linux
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* Copyright (C) 2011 Nokia Corporation
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* Copyright (C) 2011 Marcel Holtmann <marcel@holtmann.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include <bluetooth/bluetooth.h>
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#include <bluetooth/hci.h>
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#include <bluetooth/sdp.h>
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#include "glib-helper.h"
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void eir_data_free(struct eir_data *eir)
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g_slist_free_full(eir->services, g_free);
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static void eir_parse_uuid16(struct eir_data *eir, void *data, uint8_t len)
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uint16_t *uuid16 = data;
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service.type = SDP_UUID16;
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for (i = 0; i < len / 2; i++, uuid16++) {
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service.value.uuid16 = btohs(bt_get_unaligned(uuid16));
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uuid_str = bt_uuid2string(&service);
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eir->services = g_slist_append(eir->services, uuid_str);
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static void eir_parse_uuid32(struct eir_data *eir, void *data, uint8_t len)
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uint32_t *uuid32 = data;
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service.type = SDP_UUID32;
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for (i = 0; i < len / 4; i++, uuid32++) {
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service.value.uuid32 = btohl(bt_get_unaligned(uuid32));
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uuid_str = bt_uuid2string(&service);
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eir->services = g_slist_append(eir->services, uuid_str);
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static void eir_parse_uuid128(struct eir_data *eir, uint8_t *data, uint8_t len)
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uint8_t *uuid_ptr = data;
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service.type = SDP_UUID128;
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for (i = 0; i < len / 16; i++) {
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for (k = 0; k < 16; k++)
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service.value.uuid128.data[k] = uuid_ptr[16 - k - 1];
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uuid_str = bt_uuid2string(&service);
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eir->services = g_slist_append(eir->services, uuid_str);
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int eir_parse(struct eir_data *eir, uint8_t *eir_data, uint8_t eir_len)
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/* No EIR data to parse */
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if (eir_data == NULL)
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while (len < eir_len - 1) {
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uint8_t field_len = eir_data[0];
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uint8_t data_len, *data = &eir_data[2];
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/* Check for the end of EIR */
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len += field_len + 1;
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/* Do not continue EIR Data parsing if got incorrect length */
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data_len = field_len - 1;
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switch (eir_data[1]) {
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case EIR_UUID16_SOME:
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eir_parse_uuid16(eir, data, data_len);
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case EIR_UUID32_SOME:
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eir_parse_uuid32(eir, data, data_len);
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case EIR_UUID128_SOME:
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case EIR_UUID128_ALL:
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eir_parse_uuid128(eir, data, data_len);
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case EIR_NAME_COMPLETE:
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/* Some vendors put a NUL byte terminator into
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while (data_len > 0 && data[data_len - 1] == '\0')
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if (!g_utf8_validate((char *) data, data_len, NULL))
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eir->name = g_strndup((char *) data, data_len);
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eir->name_complete = eir_data[1] == EIR_NAME_COMPLETE;
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case EIR_CLASS_OF_DEV:
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memcpy(eir->dev_class, data, 3);
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case EIR_GAP_APPEARANCE:
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eir->appearance = bt_get_le16(data);
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eir_data += field_len + 1;
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#define SIZEOF_UUID128 16
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static void eir_generate_uuid128(GSList *list, uint8_t *ptr, uint16_t *eir_len)
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int i, k, uuid_count = 0;
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uint16_t len = *eir_len;
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gboolean truncated = FALSE;
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/* Store UUIDs in place, skip 2 bytes to write type and length later */
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for (; list; list = list->next) {
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struct uuid_info *uuid = list->data;
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uint8_t *uuid128_data = uuid->uuid.value.uuid128.data;
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if (uuid->uuid.type != SDP_UUID128)
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/* Stop if not enough space to put next UUID128 */
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if ((len + 2 + SIZEOF_UUID128) > HCI_MAX_EIR_LENGTH) {
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/* Check for duplicates, EIR data is Little Endian */
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for (i = 0; i < uuid_count; i++) {
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for (k = 0; k < SIZEOF_UUID128; k++) {
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if (uuid128[i * SIZEOF_UUID128 + k] !=
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uuid128_data[SIZEOF_UUID128 - 1 - k])
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if (k == SIZEOF_UUID128)
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/* EIR data is Little Endian */
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for (k = 0; k < SIZEOF_UUID128; k++)
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uuid128[uuid_count * SIZEOF_UUID128 + k] =
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uuid128_data[SIZEOF_UUID128 - 1 - k];
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len += SIZEOF_UUID128;
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if (uuid_count > 0 || truncated) {
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/* EIR Data length */
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ptr[0] = (uuid_count * SIZEOF_UUID128) + 1;
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ptr[1] = truncated ? EIR_UUID128_SOME : EIR_UUID128_ALL;
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void eir_create(const char *name, int8_t tx_power, uint16_t did_vendor,
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uint16_t did_product, uint16_t did_version,
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uint16_t did_source, GSList *uuids, uint8_t *data)
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uint16_t eir_len = 0;
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uint16_t uuid16[HCI_MAX_EIR_LENGTH / 2];
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int i, uuid_count = 0;
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gboolean truncated = FALSE;
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name_len = strlen(name);
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ptr[1] = EIR_NAME_SHORT;
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ptr[1] = EIR_NAME_COMPLETE;
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/* EIR Data length */
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ptr[0] = name_len + 1;
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memcpy(ptr + 2, name, name_len);
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eir_len += (name_len + 2);
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ptr += (name_len + 2);
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*ptr++ = EIR_TX_POWER;
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*ptr++ = (uint8_t) tx_power;
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if (did_vendor != 0x0000) {
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*ptr++ = EIR_DEVICE_ID;
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*ptr++ = (did_source & 0x00ff);
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*ptr++ = (did_source & 0xff00) >> 8;
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*ptr++ = (did_vendor & 0x00ff);
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*ptr++ = (did_vendor & 0xff00) >> 8;
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*ptr++ = (did_product & 0x00ff);
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*ptr++ = (did_product & 0xff00) >> 8;
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*ptr++ = (did_version & 0x00ff);
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*ptr++ = (did_version & 0xff00) >> 8;
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/* Group all UUID16 types */
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for (l = uuids; l != NULL; l = g_slist_next(l)) {
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struct uuid_info *uuid = l->data;
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if (uuid->uuid.type != SDP_UUID16)
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if (uuid->uuid.value.uuid16 < 0x1100)
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if (uuid->uuid.value.uuid16 == PNP_INFO_SVCLASS_ID)
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/* Stop if not enough space to put next UUID16 */
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if ((eir_len + 2 + sizeof(uint16_t)) > HCI_MAX_EIR_LENGTH) {
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/* Check for duplicates */
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for (i = 0; i < uuid_count; i++)
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if (uuid16[i] == uuid->uuid.value.uuid16)
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uuid16[uuid_count++] = uuid->uuid.value.uuid16;
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eir_len += sizeof(uint16_t);
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if (uuid_count > 0) {
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/* EIR Data length */
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ptr[0] = (uuid_count * sizeof(uint16_t)) + 1;
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ptr[1] = truncated ? EIR_UUID16_SOME : EIR_UUID16_ALL;
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for (i = 0; i < uuid_count; i++) {
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*ptr++ = (uuid16[i] & 0x00ff);
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*ptr++ = (uuid16[i] & 0xff00) >> 8;
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/* Group all UUID128 types */
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if (eir_len <= HCI_MAX_EIR_LENGTH - 2)
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eir_generate_uuid128(uuids, ptr, &eir_len);
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gboolean eir_has_data_type(uint8_t *data, size_t len, uint8_t type)
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while (parsed < len - 1) {
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parsed += field_len + 1;
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data += field_len + 1;
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size_t eir_append_data(uint8_t *eir, size_t eir_len, uint8_t type,
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uint8_t *data, size_t data_len)
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eir[eir_len++] = sizeof(type) + data_len;
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eir[eir_len++] = type;
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memcpy(&eir[eir_len], data, data_len);
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size_t eir_length(uint8_t *eir, size_t maxlen)
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size_t parsed = 0, length = 0;
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while (parsed < maxlen - 1) {
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parsed += field_len + 1;
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eir += field_len + 1;