diff options
Diffstat (limited to 'network/server.c')
| -rw-r--r-- | network/server.c | 809 |
1 files changed, 809 insertions, 0 deletions
diff --git a/network/server.c b/network/server.c new file mode 100644 index 0000000..d1da8a9 --- /dev/null +++ b/network/server.c @@ -0,0 +1,809 @@ +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <errno.h> + +#include <bluetooth/bluetooth.h> +#include <bluetooth/bnep.h> +#include <bluetooth/sdp.h> +#include <bluetooth/sdp_lib.h> +#include <netinet/in.h> + +#include <glib.h> +#include <gdbus.h> + +#include "../src/dbus-common.h" +#include "../src/adapter.h" + +#include "log.h" +#include "error.h" +#include "sdpd.h" +#include "btio.h" +#include "glib-helper.h" + +#include "common.h" +#include "server.h" + +#define NETWORK_SERVER_INTERFACE "org.bluez.NetworkServer" +#define SETUP_TIMEOUT 1 + +/* Pending Authorization */ +struct network_session { + bdaddr_t dst; /* Remote Bluetooth Address */ + GIOChannel *io; /* Pending connect channel */ + guint watch; /* BNEP socket watch */ +}; + +struct network_adapter { + struct btd_adapter *adapter; /* Adapter pointer */ + GIOChannel *io; /* Bnep socket */ + struct network_session *setup; /* Setup in progress */ + GSList *servers; /* Server register to adapter */ +}; + +/* Main server structure */ +struct network_server { + bdaddr_t src; /* Bluetooth Local Address */ + char *iface; /* DBus interface */ + char *name; /* Server service name */ + char *bridge; /* Bridge name */ + uint32_t record_id; /* Service record id */ + uint16_t id; /* Service class identifier */ + GSList *sessions; /* Active connections */ + struct network_adapter *na; /* Adapter reference */ + guint watch_id; /* Client service watch */ +}; + +static DBusConnection *connection = NULL; +static GSList *adapters = NULL; +static gboolean security = TRUE; + +static struct network_adapter *find_adapter(GSList *list, + struct btd_adapter *adapter) +{ + GSList *l; + + for (l = list; l; l = l->next) { + struct network_adapter *na = l->data; + + if (na->adapter == adapter) + return na; + } + + return NULL; +} + +static struct network_server *find_server(GSList *list, uint16_t id) +{ + GSList *l; + + for (l = list; l; l = l->next) { + struct network_server *ns = l->data; + + if (ns->id == id) + return ns; + } + + return NULL; +} + +static void add_lang_attr(sdp_record_t *r) +{ + sdp_lang_attr_t base_lang; + sdp_list_t *langs = 0; + + /* UTF-8 MIBenum (http://www.iana.org/assignments/character-sets) */ + base_lang.code_ISO639 = (0x65 << 8) | 0x6e; + base_lang.encoding = 106; + base_lang.base_offset = SDP_PRIMARY_LANG_BASE; + langs = sdp_list_append(0, &base_lang); + sdp_set_lang_attr(r, langs); + sdp_list_free(langs, 0); +} + +static sdp_record_t *server_record_new(const char *name, uint16_t id) +{ + sdp_list_t *svclass, *pfseq, *apseq, *root, *aproto; + uuid_t root_uuid, pan, l2cap, bnep; + sdp_profile_desc_t profile[1]; + sdp_list_t *proto[2]; + sdp_data_t *v, *p; + uint16_t psm = BNEP_PSM, version = 0x0100; + uint16_t security_desc = (security ? 0x0001 : 0x0000); + uint16_t net_access_type = 0xfffe; + uint32_t max_net_access_rate = 0; + const char *desc = "Network service"; + sdp_record_t *record; + + record = sdp_record_alloc(); + if (!record) + return NULL; + + record->attrlist = NULL; + record->pattern = NULL; + + switch (id) { + case BNEP_SVC_NAP: + sdp_uuid16_create(&pan, NAP_SVCLASS_ID); + svclass = sdp_list_append(NULL, &pan); + sdp_set_service_classes(record, svclass); + + sdp_uuid16_create(&profile[0].uuid, NAP_PROFILE_ID); + profile[0].version = 0x0100; + pfseq = sdp_list_append(NULL, &profile[0]); + sdp_set_profile_descs(record, pfseq); + + sdp_set_info_attr(record, name, NULL, desc); + + sdp_attr_add_new(record, SDP_ATTR_NET_ACCESS_TYPE, + SDP_UINT16, &net_access_type); + sdp_attr_add_new(record, SDP_ATTR_MAX_NET_ACCESSRATE, + SDP_UINT32, &max_net_access_rate); + break; + case BNEP_SVC_GN: + sdp_uuid16_create(&pan, GN_SVCLASS_ID); + svclass = sdp_list_append(NULL, &pan); + sdp_set_service_classes(record, svclass); + + sdp_uuid16_create(&profile[0].uuid, GN_PROFILE_ID); + profile[0].version = 0x0100; + pfseq = sdp_list_append(NULL, &profile[0]); + sdp_set_profile_descs(record, pfseq); + + sdp_set_info_attr(record, name, NULL, desc); + break; + case BNEP_SVC_PANU: + sdp_uuid16_create(&pan, PANU_SVCLASS_ID); + svclass = sdp_list_append(NULL, &pan); + sdp_set_service_classes(record, svclass); + + sdp_uuid16_create(&profile[0].uuid, PANU_PROFILE_ID); + profile[0].version = 0x0100; + pfseq = sdp_list_append(NULL, &profile[0]); + sdp_set_profile_descs(record, pfseq); + + sdp_set_info_attr(record, name, NULL, desc); + break; + default: + sdp_record_free(record); + return NULL; + } + + sdp_uuid16_create(&root_uuid, PUBLIC_BROWSE_GROUP); + root = sdp_list_append(NULL, &root_uuid); + sdp_set_browse_groups(record, root); + + sdp_uuid16_create(&l2cap, L2CAP_UUID); + proto[0] = sdp_list_append(NULL, &l2cap); + p = sdp_data_alloc(SDP_UINT16, &psm); + proto[0] = sdp_list_append(proto[0], p); + apseq = sdp_list_append(NULL, proto[0]); + + sdp_uuid16_create(&bnep, BNEP_UUID); + proto[1] = sdp_list_append(NULL, &bnep); + v = sdp_data_alloc(SDP_UINT16, &version); + proto[1] = sdp_list_append(proto[1], v); + + /* Supported protocols */ + { + uint16_t ptype[] = { + 0x0800, /* IPv4 */ + 0x0806, /* ARP */ + }; + sdp_data_t *head, *pseq; + int p; + + for (p = 0, head = NULL; p < 2; p++) { + sdp_data_t *data = sdp_data_alloc(SDP_UINT16, &ptype[p]); + if (head) + sdp_seq_append(head, data); + else + head = data; + } + pseq = sdp_data_alloc(SDP_SEQ16, head); + proto[1] = sdp_list_append(proto[1], pseq); + } + + apseq = sdp_list_append(apseq, proto[1]); + + aproto = sdp_list_append(NULL, apseq); + sdp_set_access_protos(record, aproto); + + add_lang_attr(record); + + sdp_attr_add_new(record, SDP_ATTR_SECURITY_DESC, + SDP_UINT16, &security_desc); + + sdp_data_free(p); + sdp_data_free(v); + sdp_list_free(apseq, NULL); + sdp_list_free(root, NULL); + sdp_list_free(aproto, NULL); + sdp_list_free(proto[0], NULL); + sdp_list_free(proto[1], NULL); + sdp_list_free(svclass, NULL); + sdp_list_free(pfseq, NULL); + + return record; +} + +static ssize_t send_bnep_ctrl_rsp(int sk, uint16_t val) +{ + struct bnep_control_rsp rsp; + + rsp.type = BNEP_CONTROL; + rsp.ctrl = BNEP_SETUP_CONN_RSP; + rsp.resp = htons(val); + + return send(sk, &rsp, sizeof(rsp), 0); +} + +static int server_connadd(struct network_server *ns, + struct network_session *session, + uint16_t dst_role) +{ + char devname[16]; + int err, nsk; + + memset(devname, 0, sizeof(devname)); + strcpy(devname, "bnep%d"); + + nsk = g_io_channel_unix_get_fd(session->io); + err = bnep_connadd(nsk, dst_role, devname); + if (err < 0) + return err; + + info("Added new connection: %s", devname); + + if (bnep_add_to_bridge(devname, ns->bridge) < 0) { + error("Can't add %s to the bridge %s: %s(%d)", + devname, ns->bridge, strerror(errno), errno); + return -EPERM; + } + + bnep_if_up(devname); + + ns->sessions = g_slist_append(ns->sessions, session); + + return 0; +} + +static uint16_t bnep_setup_chk(uint16_t dst_role, uint16_t src_role) +{ + /* Allowed PAN Profile scenarios */ + switch (dst_role) { + case BNEP_SVC_NAP: + case BNEP_SVC_GN: + if (src_role == BNEP_SVC_PANU) + return 0; + return BNEP_CONN_INVALID_SRC; + case BNEP_SVC_PANU: + if (src_role == BNEP_SVC_PANU || + src_role == BNEP_SVC_GN || + src_role == BNEP_SVC_NAP) + return 0; + + return BNEP_CONN_INVALID_SRC; + } + + return BNEP_CONN_INVALID_DST; +} + +static uint16_t bnep_setup_decode(struct bnep_setup_conn_req *req, + uint16_t *dst_role, uint16_t *src_role) +{ + uint8_t *dest, *source; + + dest = req->service; + source = req->service + req->uuid_size; + + switch (req->uuid_size) { + case 2: /* UUID16 */ + *dst_role = ntohs(bt_get_unaligned((uint16_t *) dest)); + *src_role = ntohs(bt_get_unaligned((uint16_t *) source)); + break; + case 4: /* UUID32 */ + case 16: /* UUID128 */ + *dst_role = ntohl(bt_get_unaligned((uint32_t *) dest)); + *src_role = ntohl(bt_get_unaligned((uint32_t *) source)); + break; + default: + return BNEP_CONN_INVALID_SVC; + } + + return 0; +} + +static void session_free(void *data) +{ + struct network_session *session = data; + + if (session->watch) + g_source_remove(session->watch); + + if (session->io) + g_io_channel_unref(session->io); + + g_free(session); +} + +static void setup_destroy(void *user_data) +{ + struct network_adapter *na = user_data; + struct network_session *setup = na->setup; + + if (!setup) + return; + + na->setup = NULL; + + session_free(setup); +} + +static gboolean bnep_setup(GIOChannel *chan, + GIOCondition cond, gpointer user_data) +{ + struct network_adapter *na = user_data; + struct network_server *ns; + uint8_t packet[BNEP_MTU]; + struct bnep_setup_conn_req *req = (void *) packet; + uint16_t src_role, dst_role, rsp = BNEP_CONN_NOT_ALLOWED; + int n, sk; + + if (cond & G_IO_NVAL) + return FALSE; + + if (cond & (G_IO_ERR | G_IO_HUP)) { + error("Hangup or error on BNEP socket"); + return FALSE; + } + + sk = g_io_channel_unix_get_fd(chan); + + /* Reading BNEP_SETUP_CONNECTION_REQUEST_MSG */ + n = read(sk, packet, sizeof(packet)); + if (n < 0) { + error("read(): %s(%d)", strerror(errno), errno); + return FALSE; + } + + /* Highest known Control command ID + * is BNEP_FILTER_MULT_ADDR_RSP = 0x06 */ + if (req->type == BNEP_CONTROL && + req->ctrl > BNEP_FILTER_MULT_ADDR_RSP) { + uint8_t pkt[3]; + + pkt[0] = BNEP_CONTROL; + pkt[1] = BNEP_CMD_NOT_UNDERSTOOD; + pkt[2] = req->ctrl; + + send(sk, pkt, sizeof(pkt), 0); + + return FALSE; + } + + if (req->type != BNEP_CONTROL || req->ctrl != BNEP_SETUP_CONN_REQ) + return FALSE; + + rsp = bnep_setup_decode(req, &dst_role, &src_role); + if (rsp) + goto reply; + + rsp = bnep_setup_chk(dst_role, src_role); + if (rsp) + goto reply; + + ns = find_server(na->servers, dst_role); + if (!ns) { + error("Server unavailable: (0x%x)", dst_role); + goto reply; + } + + if (!ns->record_id) { + error("Service record not available"); + goto reply; + } + + if (!ns->bridge) { + error("Bridge interface not configured"); + goto reply; + } + + if (server_connadd(ns, na->setup, dst_role) < 0) + goto reply; + + na->setup = NULL; + + rsp = BNEP_SUCCESS; + +reply: + send_bnep_ctrl_rsp(sk, rsp); + + return FALSE; +} + +static void connect_event(GIOChannel *chan, GError *err, gpointer user_data) +{ + struct network_adapter *na = user_data; + + if (err) { + error("%s", err->message); + setup_destroy(na); + return; + } + + g_io_channel_set_close_on_unref(chan, TRUE); + + na->setup->watch = g_io_add_watch_full(chan, G_PRIORITY_DEFAULT, + G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL, + bnep_setup, na, setup_destroy); +} + +static void auth_cb(DBusError *derr, void *user_data) +{ + struct network_adapter *na = user_data; + GError *err = NULL; + + if (derr) { + error("Access denied: %s", derr->message); + goto reject; + } + + if (!bt_io_accept(na->setup->io, connect_event, na, NULL, + &err)) { + error("bt_io_accept: %s", err->message); + g_error_free(err); + goto reject; + } + + return; + +reject: + g_io_channel_shutdown(na->setup->io, TRUE, NULL); + setup_destroy(na); +} + +static void confirm_event(GIOChannel *chan, gpointer user_data) +{ + struct network_adapter *na = user_data; + struct network_server *ns; + int perr; + bdaddr_t src, dst; + char address[18]; + GError *err = NULL; + + bt_io_get(chan, BT_IO_L2CAP, &err, + BT_IO_OPT_SOURCE_BDADDR, &src, + BT_IO_OPT_DEST_BDADDR, &dst, + BT_IO_OPT_DEST, address, + BT_IO_OPT_INVALID); + if (err) { + error("%s", err->message); + g_error_free(err); + goto drop; + } + + DBG("BNEP: incoming connect from %s", address); + + if (na->setup) { + error("Refusing connect from %s: setup in progress", address); + goto drop; + } + + ns = find_server(na->servers, BNEP_SVC_NAP); + if (!ns) + goto drop; + + if (!ns->record_id) + goto drop; + + if (!ns->bridge) + goto drop; + + na->setup = g_new0(struct network_session, 1); + bacpy(&na->setup->dst, &dst); + na->setup->io = g_io_channel_ref(chan); + + perr = btd_request_authorization(&src, &dst, BNEP_SVC_UUID, + auth_cb, na); + if (perr < 0) { + error("Refusing connect from %s: %s (%d)", address, + strerror(-perr), -perr); + setup_destroy(na); + goto drop; + } + + return; + +drop: + g_io_channel_shutdown(chan, TRUE, NULL); +} + +int server_init(DBusConnection *conn, gboolean secure) +{ + security = secure; + connection = dbus_connection_ref(conn); + + return 0; +} + +void server_exit(void) +{ + dbus_connection_unref(connection); + connection = NULL; +} + +static uint32_t register_server_record(struct network_server *ns) +{ + sdp_record_t *record; + + record = server_record_new(ns->name, ns->id); + if (!record) { + error("Unable to allocate new service record"); + return 0; + } + + if (add_record_to_server(&ns->src, record) < 0) { + error("Failed to register service record"); + sdp_record_free(record); + return 0; + } + + DBG("got record id 0x%x", record->handle); + + return record->handle; +} + +static void server_disconnect(DBusConnection *conn, void *user_data) +{ + struct network_server *ns = user_data; + + ns->watch_id = 0; + + if (ns->record_id) { + remove_record_from_server(ns->record_id); + ns->record_id = 0; + } + + g_free(ns->bridge); + ns->bridge = NULL; +} + +static DBusMessage *register_server(DBusConnection *conn, + DBusMessage *msg, void *data) +{ + struct network_server *ns = data; + DBusMessage *reply; + const char *uuid, *bridge; + + if (!dbus_message_get_args(msg, NULL, DBUS_TYPE_STRING, &uuid, + DBUS_TYPE_STRING, &bridge, DBUS_TYPE_INVALID)) + return NULL; + + if (g_strcmp0(uuid, "nap")) + return btd_error_failed(msg, "Invalid UUID"); + + if (ns->record_id) + return btd_error_already_exists(msg); + + reply = dbus_message_new_method_return(msg); + if (!reply) + return NULL; + + ns->record_id = register_server_record(ns); + if (!ns->record_id) + return btd_error_failed(msg, "SDP record registration failed"); + + g_free(ns->bridge); + ns->bridge = g_strdup(bridge); + + ns->watch_id = g_dbus_add_disconnect_watch(conn, + dbus_message_get_sender(msg), + server_disconnect, ns, NULL); + + return reply; +} + +static DBusMessage *unregister_server(DBusConnection *conn, + DBusMessage *msg, void *data) +{ + struct network_server *ns = data; + DBusMessage *reply; + const char *uuid; + + if (!dbus_message_get_args(msg, NULL, DBUS_TYPE_STRING, &uuid, + DBUS_TYPE_INVALID)) + return NULL; + + if (g_strcmp0(uuid, "nap")) + return btd_error_failed(msg, "Invalid UUID"); + + reply = dbus_message_new_method_return(msg); + if (!reply) + return NULL; + + g_dbus_remove_watch(conn, ns->watch_id); + + server_disconnect(conn, ns); + + return reply; +} + +static void adapter_free(struct network_adapter *na) +{ + if (na->io != NULL) { + g_io_channel_shutdown(na->io, TRUE, NULL); + g_io_channel_unref(na->io); + } + + setup_destroy(na); + btd_adapter_unref(na->adapter); + g_free(na); +} + +static void server_free(struct network_server *ns) +{ + if (!ns) + return; + + /* FIXME: Missing release/free all bnepX interfaces */ + if (ns->record_id) + remove_record_from_server(ns->record_id); + + g_free(ns->iface); + g_free(ns->name); + g_free(ns->bridge); + + if (ns->sessions) { + g_slist_foreach(ns->sessions, (GFunc) session_free, NULL); + g_slist_free(ns->sessions); + } + + g_free(ns); +} + +static void path_unregister(void *data) +{ + struct network_server *ns = data; + struct network_adapter *na = ns->na; + + DBG("Unregistered interface %s on path %s", + ns->iface, adapter_get_path(na->adapter)); + + na->servers = g_slist_remove(na->servers, ns); + server_free(ns); + + if (na->servers) + return; + + adapters = g_slist_remove(adapters, na); + adapter_free(na); +} + +static GDBusMethodTable server_methods[] = { + { "Register", "ss", "", register_server }, + { "Unregister", "s", "", unregister_server }, + { } +}; + +static struct network_adapter *create_adapter(struct btd_adapter *adapter) +{ + struct network_adapter *na; + GError *err = NULL; + bdaddr_t src; + + na = g_new0(struct network_adapter, 1); + na->adapter = btd_adapter_ref(adapter); + + adapter_get_address(adapter, &src); + + na->io = bt_io_listen(BT_IO_L2CAP, NULL, confirm_event, na, + NULL, &err, + BT_IO_OPT_SOURCE_BDADDR, &src, + BT_IO_OPT_PSM, BNEP_PSM, + BT_IO_OPT_OMTU, BNEP_MTU, + BT_IO_OPT_IMTU, BNEP_MTU, + BT_IO_OPT_SEC_LEVEL, + security ? BT_IO_SEC_MEDIUM : BT_IO_SEC_LOW, + BT_IO_OPT_INVALID); + if (!na->io) { + error("%s", err->message); + g_error_free(err); + adapter_free(na); + return NULL; + } + + return na; +} + +int server_register(struct btd_adapter *adapter) +{ + struct network_adapter *na; + struct network_server *ns; + const char *path; + + na = find_adapter(adapters, adapter); + if (!na) { + na = create_adapter(adapter); + if (!na) + return -EINVAL; + adapters = g_slist_append(adapters, na); + } + + ns = find_server(na->servers, BNEP_SVC_NAP); + if (ns) + return 0; + + ns = g_new0(struct network_server, 1); + + ns->iface = g_strdup(NETWORK_SERVER_INTERFACE); + ns->name = g_strdup("Network service"); + + path = adapter_get_path(adapter); + + if (!g_dbus_register_interface(connection, path, ns->iface, + server_methods, NULL, NULL, + ns, path_unregister)) { + error("D-Bus failed to register %s interface", + ns->iface); + server_free(ns); + return -1; + } + + adapter_get_address(adapter, &ns->src); + ns->id = BNEP_SVC_NAP; + ns->na = na; + ns->record_id = 0; + na->servers = g_slist_append(na->servers, ns); + + DBG("Registered interface %s on path %s", ns->iface, path); + + return 0; +} + +int server_unregister(struct btd_adapter *adapter) +{ + struct network_adapter *na; + struct network_server *ns; + uint16_t id = BNEP_SVC_NAP; + + na = find_adapter(adapters, adapter); + if (!na) + return -EINVAL; + + ns = find_server(na->servers, id); + if (!ns) + return -EINVAL; + + g_dbus_unregister_interface(connection, adapter_get_path(adapter), + ns->iface); + + return 0; +} |