Return-Path: From: Arman Uguray To: linux-bluetooth@vger.kernel.org Cc: Arman Uguray Subject: [PATCH BlueZ v2 4/7] tools/btgatt-server: Populate the database. Date: Thu, 13 Nov 2014 18:49:50 -0800 Message-Id: <1415933393-28902-5-git-send-email-armansito@chromium.org> In-Reply-To: <1415933393-28902-1-git-send-email-armansito@chromium.org> References: <1415933393-28902-1-git-send-email-armansito@chromium.org> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: This patch populates the GATT database with the GAP and GATT services. --- tools/btgatt-server.c | 259 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) diff --git a/tools/btgatt-server.c b/tools/btgatt-server.c index e185413..545c8c4 100644 --- a/tools/btgatt-server.c +++ b/tools/btgatt-server.c @@ -42,12 +42,18 @@ #define ATT_CID 4 +#define UUID_GAP 0x1800 + #define PRLOG(...) \ do { \ printf(__VA_ARGS__); \ print_prompt(); \ } while (0) +#ifndef MIN +#define MIN(a, b) ((a) < (b) ? (a) : (b)) +#endif + #define COLOR_OFF "\x1B[0m" #define COLOR_RED "\x1B[0;91m" #define COLOR_GREEN "\x1B[0;92m" @@ -57,12 +63,19 @@ #define COLOR_BOLDGRAY "\x1B[1;30m" #define COLOR_BOLDWHITE "\x1B[1;37m" +static const char test_device_name[] = "Very Long Test Device Name For Testing " + "ATT Protocol Operations On GATT Server"; static bool verbose = false; struct server { int fd; struct gatt_db *db; struct bt_gatt_server *gatt; + + uint8_t *device_name; + size_t name_len; + + bool svc_chngd_enabled; }; static void print_prompt(void) @@ -93,10 +106,243 @@ static void gatt_debug_cb(const char *str, void *user_data) PRLOG(COLOR_GREEN "%s%s\n" COLOR_OFF, prefix, str); } +static void gap_device_name_read_cb(struct gatt_db_attribute *attrib, + unsigned int id, uint16_t offset, + uint8_t opcode, bdaddr_t *bdaddr, + void *user_data) +{ + struct server *server = user_data; + uint8_t error = 0; + size_t len = 0; + const uint8_t *value = NULL; + + PRLOG("GAP Device Name Read called\n"); + + len = server->name_len; + + if (offset > len) { + error = BT_ATT_ERROR_INVALID_OFFSET; + goto done; + } + + len -= offset; + value = len ? &server->device_name[offset] : NULL; + +done: + gatt_db_attribute_read_result(attrib, id, error, value, len); +} + +static void gap_device_name_write_cb(struct gatt_db_attribute *attrib, + unsigned int id, uint16_t offset, + const uint8_t *value, size_t len, + uint8_t opcode, bdaddr_t *bdaddr, + void *user_data) +{ + struct server *server = user_data; + uint8_t error = 0; + + PRLOG("GAP Device Name Write called\n"); + + /* Implement this as a variable length attribute value. */ + if (offset > server->name_len) { + error = BT_ATT_ERROR_INVALID_OFFSET; + goto done; + } + + if (offset + len != server->name_len) { + uint8_t *name; + + name = realloc(server->device_name, offset + len); + if (!name) { + error = BT_ATT_ERROR_INSUFFICIENT_RESOURCES; + goto done; + } + + memcpy(name, server->device_name, + MIN(offset + len, server->name_len)); + server->device_name = name; + server->name_len = offset + len; + } + + if (value) + memcpy(server->device_name + offset, value, len); + +done: + gatt_db_attribute_write_result(attrib, id, error); +} + +static void gap_device_name_ext_prop_read_cb(struct gatt_db_attribute *attrib, + unsigned int id, uint16_t offset, + uint8_t opcode, bdaddr_t *bdaddr, + void *user_data) +{ + uint8_t value[2]; + + PRLOG("Device Name Extended Properties Read called\n"); + + value[0] = BT_GATT_CHRC_EXT_PROP_RELIABLE_WRITE; + value[1] = 0; + + gatt_db_attribute_read_result(attrib, id, 0, value, sizeof(value)); +} + +static void gatt_service_changed_cb(struct gatt_db_attribute *attrib, + unsigned int id, uint16_t offset, + uint8_t opcode, bdaddr_t *bdaddr, + void *user_data) +{ + PRLOG("Service Changed Read called\n"); + + gatt_db_attribute_read_result(attrib, id, 0, NULL, 0); +} + +static void gatt_svc_chngd_ccc_read_cb(struct gatt_db_attribute *attrib, + unsigned int id, uint16_t offset, + uint8_t opcode, bdaddr_t *bdaddr, + void *user_data) +{ + struct server *server = user_data; + uint8_t value[2]; + + PRLOG("Service Changed CCC Read called\n"); + + value[0] = server->svc_chngd_enabled ? 0x02 : 0x00; + value[1] = 0x00; + + gatt_db_attribute_read_result(attrib, id, 0, value, sizeof(value)); +} + +static void gatt_svc_chngd_ccc_write_cb(struct gatt_db_attribute *attrib, + unsigned int id, uint16_t offset, + const uint8_t *value, size_t len, + uint8_t opcode, bdaddr_t *bdaddr, + void *user_data) +{ + struct server *server = user_data; + uint8_t ecode = 0; + + PRLOG("Service Changed CCC Write called\n"); + + if (!value || len != 2) { + ecode = BT_ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LEN; + goto done; + } + + if (offset) { + ecode = BT_ATT_ERROR_INVALID_OFFSET; + goto done; + } + + if (value[0] == 0x00) + server->svc_chngd_enabled = false; + else if (value[0] == 0x02) + server->svc_chngd_enabled = true; + else + ecode = 0x80; + + PRLOG("Service Changed Enabled: %s\n", + server->svc_chngd_enabled ? "true" : "false"); + +done: + gatt_db_attribute_write_result(attrib, id, ecode); +} + +static void confirm_write(struct gatt_db_attribute *attr, int err, + void *user_data) +{ + if (!err) + return; + + fprintf(stderr, "Error caching attribute %p - err: %d\n", attr, err); + exit(1); +} + +static void populate_gap_service(struct server *server) +{ + bt_uuid_t uuid; + struct gatt_db_attribute *service, *tmp; + uint16_t appearance; + + /* Add the GAP service */ + bt_uuid16_create(&uuid, UUID_GAP); + service = gatt_db_add_service(server->db, &uuid, true, 6); + + /* + * Device Name characteristic. Make the value dynamically read and + * written via callbacks. + */ + bt_uuid16_create(&uuid, GATT_CHARAC_DEVICE_NAME); + gatt_db_service_add_characteristic(service, &uuid, + BT_ATT_PERM_READ | BT_ATT_PERM_WRITE, + BT_GATT_CHRC_PROP_READ, + gap_device_name_read_cb, + gap_device_name_write_cb, + server); + + bt_uuid16_create(&uuid, GATT_CHARAC_EXT_PROPER_UUID); + gatt_db_service_add_descriptor(service, &uuid, BT_ATT_PERM_READ, + gap_device_name_ext_prop_read_cb, + NULL, server); + + /* + * Appearance characteristic. Reads and writes should obtain the value + * from the database. + */ + bt_uuid16_create(&uuid, GATT_CHARAC_APPEARANCE); + tmp = gatt_db_service_add_characteristic(service, &uuid, + BT_ATT_PERM_READ, + BT_GATT_CHRC_PROP_READ, + NULL, NULL, server); + + /* + * Write the appearance value to the database, since we're not using a + * callback. + */ + put_le16(128, &appearance); + gatt_db_attribute_write(tmp, 0, (void *) &appearance, + sizeof(appearance), + BT_ATT_OP_WRITE_REQ, + NULL, confirm_write, + NULL); + + gatt_db_service_set_active(service, true); +} + +static void populate_gatt_service(struct server *server) +{ + bt_uuid_t uuid; + struct gatt_db_attribute *service; + + /* Add the GATT service */ + bt_uuid16_create(&uuid, 0x1801); + service = gatt_db_add_service(server->db, &uuid, true, 4); + + bt_uuid16_create(&uuid, GATT_CHARAC_SERVICE_CHANGED); + gatt_db_service_add_characteristic(service, &uuid, BT_ATT_PERM_READ, + BT_GATT_CHRC_PROP_READ | BT_GATT_CHRC_PROP_INDICATE, + gatt_service_changed_cb, + NULL, server); + + bt_uuid16_create(&uuid, GATT_CLIENT_CHARAC_CFG_UUID); + gatt_db_service_add_descriptor(service, &uuid, + BT_ATT_PERM_READ | BT_ATT_PERM_WRITE, + gatt_svc_chngd_ccc_read_cb, + gatt_svc_chngd_ccc_write_cb, server); + + gatt_db_service_set_active(service, true); +} + +static void populate_db(struct server *server) +{ + populate_gap_service(server); + populate_gatt_service(server); +} + static struct server *server_create(int fd, uint16_t mtu) { struct server *server; struct bt_att *att; + size_t name_len = strlen(test_device_name); server = new0(struct server, 1); if (!server) { @@ -120,6 +366,16 @@ static struct server *server_create(int fd, uint16_t mtu) goto fail; } + server->name_len = name_len + 1; + server->device_name = malloc(name_len + 1); + if (!server->device_name) { + fprintf(stderr, "Failed to allocate memory for device name\n"); + goto fail; + } + + memcpy(server->device_name, test_device_name, name_len); + server->device_name[name_len] = '\0'; + server->fd = fd; server->db = gatt_db_new(); if (!server->db) { @@ -142,10 +398,13 @@ static struct server *server_create(int fd, uint16_t mtu) /* bt_gatt_server already holds a reference */ bt_att_unref(att); + populate_db(server); + return server; fail: gatt_db_destroy(server->db); + free(server->device_name); bt_att_unref(att); free(server); -- 2.1.0.rc2.206.gedb03e5