mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-12-23 06:02:37 +01:00
a4c0515e0f
Add a second netconfig-commit backend which, if enabled, doesn't directly send any of the network configuration to the kernel or system files but delegates the operation to an interested client's D-Bus method as described in doc/agent-api.txt. This backend is switched to when a client registers a netconfig agent object and is swiched away from when the client disconnects or unregisters the agent. Only one netconfig agent can be registered any given time.
723 lines
17 KiB
C
723 lines
17 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2015-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <ell/ell.h>
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#include "src/dbus.h"
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#include "src/netconfig.h"
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#include "src/agent.h"
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#include "src/iwd.h"
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#include "src/module.h"
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static unsigned int next_request_id = 0;
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enum agent_request_type {
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AGENT_REQUEST_TYPE_PASSPHRASE,
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AGENT_REQUEST_TYPE_USER_NAME_PASSWD,
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};
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/* Agent dbus request is done from iwd towards the agent */
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struct agent_request {
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enum agent_request_type type;
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struct l_dbus_message *message;
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unsigned int id;
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void *user_data;
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void *user_callback;
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struct l_dbus_message *trigger;
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agent_request_destroy_func_t destroy;
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};
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struct agent {
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char *owner;
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char *path;
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unsigned int disconnect_watch;
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uint32_t pending_id;
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struct l_timeout *timeout;
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int timeout_secs;
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struct l_queue *requests;
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};
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static struct l_queue *agents;
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/*
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* How long we wait for user to input things.
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* Return value is in seconds.
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*
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* This should probably be configurable by user via
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* config file/command line option/env variable.
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*/
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static unsigned int agent_timeout_input_request(void)
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{
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return 120;
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}
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static void send_cancel_request(void *user_data, int reason)
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{
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struct agent *agent = user_data;
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struct l_dbus_message *message;
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const char *reasonstr;
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switch (reason) {
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case -ECANCELED:
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reasonstr = "user-canceled";
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break;
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case -ETIMEDOUT:
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reasonstr = "timed-out";
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break;
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case -ERANGE:
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reasonstr = "out-of-range";
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break;
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case -ESHUTDOWN:
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reasonstr = "shutdown";
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break;
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default:
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reasonstr = "unknown";
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}
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l_debug("send a Cancel(%s) to %s %s", reasonstr,
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agent->owner, agent->path);
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message = l_dbus_message_new_method_call(dbus_get_bus(),
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agent->owner,
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agent->path,
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IWD_AGENT_INTERFACE,
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"Cancel");
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l_dbus_message_set_arguments(message, "s", reasonstr);
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l_dbus_message_set_no_reply(message, true);
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l_dbus_send(dbus_get_bus(), message);
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}
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static void agent_request_free(void *user_data)
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{
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struct agent_request *request = user_data;
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l_dbus_message_unref(request->message);
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if (request->trigger)
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dbus_pending_reply(&request->trigger,
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dbus_error_aborted(request->trigger));
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if (request->destroy)
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request->destroy(request->user_data);
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l_free(request);
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}
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static void passphrase_reply(struct l_dbus_message *reply,
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struct agent_request *request)
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{
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const char *error, *text;
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char *passphrase = NULL;
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enum agent_result result = AGENT_RESULT_FAILED;
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agent_request_passphrase_func_t user_callback = request->user_callback;
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if (l_dbus_message_get_error(reply, &error, &text))
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goto done;
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if (!l_dbus_message_get_arguments(reply, "s", &passphrase))
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goto done;
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result = AGENT_RESULT_OK;
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done:
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user_callback(result, passphrase, request->trigger, request->user_data);
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}
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static void user_name_passwd_reply(struct l_dbus_message *reply,
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struct agent_request *request)
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{
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const char *error, *text;
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char *username = NULL;
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char *passwd = NULL;
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enum agent_result result = AGENT_RESULT_FAILED;
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agent_request_user_name_passwd_func_t user_callback =
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request->user_callback;
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if (l_dbus_message_get_error(reply, &error, &text))
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goto done;
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if (!l_dbus_message_get_arguments(reply, "ss", &username, &passwd))
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goto done;
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result = AGENT_RESULT_OK;
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done:
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user_callback(result, username, passwd,
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request->trigger, request->user_data);
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}
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static void agent_finalize_pending(struct agent *agent,
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struct l_dbus_message *reply)
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{
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struct agent_request *pending;
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if (agent->timeout) {
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l_timeout_remove(agent->timeout);
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agent->timeout = NULL;
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}
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pending = l_queue_pop_head(agent->requests);
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switch (pending->type) {
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case AGENT_REQUEST_TYPE_PASSPHRASE:
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passphrase_reply(reply, pending);
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break;
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case AGENT_REQUEST_TYPE_USER_NAME_PASSWD:
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user_name_passwd_reply(reply, pending);
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break;
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}
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if (pending->trigger) {
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l_dbus_message_unref(pending->trigger);
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pending->trigger = NULL;
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}
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agent_request_free(pending);
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}
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static void agent_free(void *data)
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{
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struct agent *agent = data;
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l_debug("agent free %p", agent);
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if (agent->timeout)
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l_timeout_remove(agent->timeout);
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if (agent->pending_id)
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l_dbus_cancel(dbus_get_bus(), agent->pending_id);
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l_queue_destroy(agent->requests, agent_request_free);
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if (agent->disconnect_watch)
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l_dbus_remove_watch(dbus_get_bus(), agent->disconnect_watch);
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l_free(agent->owner);
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l_free(agent->path);
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l_free(agent);
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}
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static void agent_send_next_request(struct agent *agent);
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static void request_timeout(struct l_timeout *timeout, void *user_data)
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{
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struct agent *agent = user_data;
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l_dbus_cancel(dbus_get_bus(), agent->pending_id);
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send_cancel_request(agent, -ETIMEDOUT);
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agent_finalize_pending(agent, NULL);
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agent_send_next_request(agent);
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}
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static void agent_receive_reply(struct l_dbus_message *message,
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void *user_data)
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{
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struct agent *agent = user_data;
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l_debug("agent %p request id %u", agent, agent->pending_id);
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agent->pending_id = 0;
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agent_finalize_pending(agent, message);
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if (!agent->pending_id)
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agent_send_next_request(agent);
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}
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static void agent_send_next_request(struct agent *agent)
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{
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struct agent_request *pending;
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pending = l_queue_peek_head(agent->requests);
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if (!pending)
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return;
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agent->timeout = l_timeout_create(agent->timeout_secs,
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request_timeout,
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agent, NULL);
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l_debug("send request to %s %s", agent->owner, agent->path);
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agent->pending_id = l_dbus_send_with_reply(dbus_get_bus(),
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pending->message,
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agent_receive_reply,
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agent, NULL);
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pending->message = NULL;
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}
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static unsigned int agent_queue_request(struct agent *agent,
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enum agent_request_type type,
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struct l_dbus_message *message,
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int timeout, void *callback,
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struct l_dbus_message *trigger,
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void *user_data,
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agent_request_destroy_func_t destroy)
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{
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struct agent_request *request;
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request = l_new(struct agent_request, 1);
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request->type = type;
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request->message = message;
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request->id = ++next_request_id;
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request->user_data = user_data;
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request->user_callback = callback;
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request->trigger = l_dbus_message_ref(trigger);
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request->destroy = destroy;
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agent->timeout_secs = timeout;
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l_queue_push_tail(agent->requests, request);
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if (l_queue_length(agent->requests) == 1)
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agent_send_next_request(agent);
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return request->id;
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}
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static struct agent *agent_lookup(const char *owner)
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{
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const struct l_queue_entry *entry;
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if (!owner)
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return NULL;
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for (entry = l_queue_get_entries(agents); entry; entry = entry->next) {
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struct agent *agent = entry->data;
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if (strcmp(agent->owner, owner))
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continue;
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return agent;
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}
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return NULL;
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}
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static struct agent *get_agent(const char *owner)
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{
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struct agent *agent = agent_lookup(owner);
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if (agent)
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return agent;
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return l_queue_peek_head(agents);
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}
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/**
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* agent_request_passphrase:
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* @path: object path related to this request (like network object path)
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* @callback: user callback called when the request is ready
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* @trigger: Message associated with (e.g. that triggered) this request
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* @user_data: user defined data
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* @destroy: callback to release @user_data when this request finishes
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*
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* Called when a passphrase information is needed from the user. Returns an
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* id that can be used to cancel the request.
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*
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* If @trigger is not NULL, then a reference is taken automatically. If
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* agent_cancel_request is called subsequently, a dbus_aborted error is
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* automatically generated for @trigger. Otherwise, after @callback is
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* called, the reference to @trigger is dropped. It is assumed that the
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* caller will take ownership of @trigger in the callback if needed.
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*/
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unsigned int agent_request_passphrase(const char *path,
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agent_request_passphrase_func_t callback,
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struct l_dbus_message *trigger,
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void *user_data,
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agent_request_destroy_func_t destroy)
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{
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struct agent *agent = get_agent(l_dbus_message_get_sender(trigger));
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struct l_dbus_message *message;
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if (!agent || !callback)
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return 0;
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l_debug("agent %p owner %s path %s", agent, agent->owner, agent->path);
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message = l_dbus_message_new_method_call(dbus_get_bus(),
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agent->owner,
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agent->path,
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IWD_AGENT_INTERFACE,
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"RequestPassphrase");
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l_dbus_message_set_arguments(message, "o", path);
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return agent_queue_request(agent, AGENT_REQUEST_TYPE_PASSPHRASE,
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message, agent_timeout_input_request(),
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callback, trigger, user_data, destroy);
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}
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unsigned int agent_request_pkey_passphrase(const char *path,
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agent_request_passphrase_func_t callback,
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struct l_dbus_message *trigger,
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void *user_data,
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agent_request_destroy_func_t destroy)
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{
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struct agent *agent = get_agent(l_dbus_message_get_sender(trigger));
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struct l_dbus_message *message;
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if (!agent || !callback)
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return 0;
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l_debug("agent %p owner %s path %s", agent, agent->owner, agent->path);
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message = l_dbus_message_new_method_call(dbus_get_bus(),
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agent->owner, agent->path,
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IWD_AGENT_INTERFACE,
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"RequestPrivateKeyPassphrase");
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l_dbus_message_set_arguments(message, "o", path);
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return agent_queue_request(agent, AGENT_REQUEST_TYPE_PASSPHRASE,
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message, agent_timeout_input_request(),
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callback, trigger, user_data, destroy);
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}
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unsigned int agent_request_user_name_password(const char *path,
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agent_request_user_name_passwd_func_t callback,
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struct l_dbus_message *trigger,
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void *user_data,
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agent_request_destroy_func_t destroy)
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{
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struct agent *agent = get_agent(l_dbus_message_get_sender(trigger));
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struct l_dbus_message *message;
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if (!agent || !callback)
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return 0;
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l_debug("agent %p owner %s path %s", agent, agent->owner, agent->path);
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message = l_dbus_message_new_method_call(dbus_get_bus(),
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agent->owner, agent->path,
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IWD_AGENT_INTERFACE,
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"RequestUserNameAndPassword");
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l_dbus_message_set_arguments(message, "o", path);
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return agent_queue_request(agent, AGENT_REQUEST_TYPE_USER_NAME_PASSWD,
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message, agent_timeout_input_request(),
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callback, trigger, user_data, destroy);
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}
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unsigned int agent_request_user_password(const char *path, const char *user,
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agent_request_passphrase_func_t callback,
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struct l_dbus_message *trigger, void *user_data,
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agent_request_destroy_func_t destroy)
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{
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struct agent *agent = get_agent(l_dbus_message_get_sender(trigger));
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struct l_dbus_message *message;
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if (!agent || !callback)
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return 0;
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l_debug("agent %p owner %s path %s", agent, agent->owner, agent->path);
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message = l_dbus_message_new_method_call(dbus_get_bus(),
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agent->owner, agent->path,
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IWD_AGENT_INTERFACE,
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"RequestUserPassword");
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l_dbus_message_set_arguments(message, "os", path, user ?: "");
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return agent_queue_request(agent, AGENT_REQUEST_TYPE_PASSPHRASE,
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message, agent_timeout_input_request(),
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callback, trigger, user_data, destroy);
|
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}
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|
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static bool find_request(const void *a, const void *b)
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{
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const struct agent_request *request = a;
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unsigned int id = L_PTR_TO_UINT(b);
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|
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return request->id == id;
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}
|
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|
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bool agent_request_cancel(unsigned int req_id, int reason)
|
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{
|
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struct agent_request *request = NULL;
|
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struct agent *agent;
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const struct l_queue_entry *entry;
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|
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for (entry = l_queue_get_entries(agents); entry; entry = entry->next) {
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agent = entry->data;
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|
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request = l_queue_remove_if(agent->requests, find_request,
|
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L_UINT_TO_PTR(req_id));
|
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if (request)
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break;
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}
|
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|
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if (!request)
|
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return false;
|
|
|
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if (!request->message) {
|
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send_cancel_request(agent, reason);
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|
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l_dbus_cancel(dbus_get_bus(), agent->pending_id);
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|
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agent->pending_id = 0;
|
|
|
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if (agent->timeout) {
|
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l_timeout_remove(agent->timeout);
|
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agent->timeout = NULL;
|
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}
|
|
|
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agent_send_next_request(agent);
|
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}
|
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|
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agent_request_free(request);
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|
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return true;
|
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}
|
|
|
|
static void agent_disconnect(struct l_dbus *dbus, void *user_data)
|
|
{
|
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struct agent *agent = user_data;
|
|
|
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l_debug("agent %s disconnected", agent->owner);
|
|
|
|
if (agent->pending_id)
|
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agent_finalize_pending(agent, NULL);
|
|
|
|
l_queue_remove(agents, agent);
|
|
|
|
l_idle_oneshot(agent_free, agent, NULL);
|
|
}
|
|
|
|
static struct agent *agent_create(struct l_dbus *dbus, const char *name,
|
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const char *path)
|
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{
|
|
struct agent *agent;
|
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|
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agent = l_new(struct agent, 1);
|
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|
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agent->owner = l_strdup(name);
|
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agent->path = l_strdup(path);
|
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agent->requests = l_queue_new();
|
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agent->disconnect_watch = l_dbus_add_disconnect_watch(dbus, name,
|
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agent_disconnect,
|
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agent, NULL);
|
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return agent;
|
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}
|
|
|
|
static struct l_dbus_message *agent_register(struct l_dbus *dbus,
|
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struct l_dbus_message *message,
|
|
void *user_data)
|
|
{
|
|
struct agent *agent = agent_lookup(l_dbus_message_get_sender(message));
|
|
struct l_dbus_message *reply;
|
|
const char *path;
|
|
|
|
if (agent)
|
|
return dbus_error_already_exists(message);
|
|
|
|
l_debug("agent register called");
|
|
|
|
if (!l_dbus_message_get_arguments(message, "o", &path))
|
|
return dbus_error_invalid_args(message);
|
|
|
|
agent = agent_create(dbus, l_dbus_message_get_sender(message), path);
|
|
if (!agent)
|
|
return dbus_error_failed(message);
|
|
|
|
l_queue_push_tail(agents, agent);
|
|
|
|
l_debug("agent %s path %s", agent->owner, agent->path);
|
|
|
|
reply = l_dbus_message_new_method_return(message);
|
|
|
|
l_dbus_message_set_arguments(reply, "");
|
|
|
|
return reply;
|
|
}
|
|
|
|
static struct l_dbus_message *agent_unregister(struct l_dbus *dbus,
|
|
struct l_dbus_message *message,
|
|
void *user_data)
|
|
{
|
|
struct agent *agent = agent_lookup(l_dbus_message_get_sender(message));
|
|
struct l_dbus_message *reply;
|
|
|
|
l_debug("agent unregister");
|
|
|
|
if (!agent)
|
|
return dbus_error_not_found(message);
|
|
|
|
l_queue_remove(agents, agent);
|
|
|
|
agent_free(agent);
|
|
|
|
reply = l_dbus_message_new_method_return(message);
|
|
|
|
l_dbus_message_set_arguments(reply, "");
|
|
|
|
return reply;
|
|
}
|
|
|
|
static struct l_dbus_message *netconfig_agent_register(struct l_dbus *dbus,
|
|
struct l_dbus_message *message,
|
|
void *user_data)
|
|
{
|
|
struct l_dbus_message *reply;
|
|
const char *path;
|
|
int r;
|
|
|
|
l_debug("");
|
|
|
|
if (!l_dbus_message_get_arguments(message, "o", &path))
|
|
return dbus_error_invalid_args(message);
|
|
|
|
if (!netconfig_enabled())
|
|
return dbus_error_not_supported(message);
|
|
|
|
r = netconfig_register_agent(l_dbus_message_get_sender(message), path);
|
|
if (r)
|
|
return dbus_error_from_errno(r, message);
|
|
|
|
l_debug("agent %s path %s",
|
|
l_dbus_message_get_sender(message), path);
|
|
|
|
reply = l_dbus_message_new_method_return(message);
|
|
l_dbus_message_set_arguments(reply, "");
|
|
return reply;
|
|
}
|
|
|
|
static struct l_dbus_message *netconfig_agent_unregister(struct l_dbus *dbus,
|
|
struct l_dbus_message *message,
|
|
void *user_data)
|
|
{
|
|
struct l_dbus_message *reply;
|
|
const char *path;
|
|
int r;
|
|
|
|
l_debug("");
|
|
|
|
if (!l_dbus_message_get_arguments(message, "o", &path))
|
|
return dbus_error_invalid_args(message);
|
|
|
|
if (!netconfig_enabled())
|
|
return dbus_error_not_supported(message);
|
|
|
|
r = netconfig_unregister_agent(l_dbus_message_get_sender(message),
|
|
path);
|
|
if (r)
|
|
return dbus_error_from_errno(r, message);
|
|
|
|
reply = l_dbus_message_new_method_return(message);
|
|
l_dbus_message_set_arguments(reply, "");
|
|
return reply;
|
|
}
|
|
|
|
static void setup_agent_interface(struct l_dbus_interface *interface)
|
|
{
|
|
l_dbus_interface_method(interface, "RegisterAgent", 0,
|
|
agent_register,
|
|
"", "o", "path");
|
|
l_dbus_interface_method(interface, "UnregisterAgent", 0,
|
|
agent_unregister,
|
|
"", "o", "path");
|
|
|
|
l_dbus_interface_method(interface,
|
|
"RegisterNetworkConfigurationAgent", 0,
|
|
netconfig_agent_register, "", "o", "path");
|
|
l_dbus_interface_method(interface,
|
|
"UnregisterNetworkConfigurationAgent", 0,
|
|
netconfig_agent_unregister, "", "o", "path");
|
|
}
|
|
|
|
static bool release_agent(void *data, void *user_data)
|
|
{
|
|
struct agent *agent = data;
|
|
struct l_dbus_message *message;
|
|
|
|
l_debug("send Release to %s %s", agent->owner, agent->path);
|
|
|
|
message = l_dbus_message_new_method_call(dbus_get_bus(),
|
|
agent->owner,
|
|
agent->path,
|
|
IWD_AGENT_INTERFACE,
|
|
"Release");
|
|
|
|
l_dbus_message_set_arguments(message, "");
|
|
l_dbus_message_set_no_reply(message, true);
|
|
l_dbus_send(dbus_get_bus(), message);
|
|
|
|
agent_free(agent);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int agent_init(void)
|
|
{
|
|
struct l_dbus *dbus = dbus_get_bus();
|
|
|
|
agents = l_queue_new();
|
|
|
|
if (!l_dbus_register_interface(dbus, IWD_AGENT_MANAGER_INTERFACE,
|
|
setup_agent_interface,
|
|
NULL, false)) {
|
|
l_info("Unable to register %s interface",
|
|
IWD_AGENT_MANAGER_INTERFACE);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!l_dbus_object_add_interface(dbus, IWD_AGENT_MANAGER_PATH,
|
|
IWD_AGENT_MANAGER_INTERFACE,
|
|
NULL)) {
|
|
l_info("Unable to register the agent manager object on '%s'",
|
|
IWD_AGENT_MANAGER_PATH);
|
|
l_dbus_unregister_interface(dbus, IWD_AGENT_MANAGER_INTERFACE);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void agent_exit(void)
|
|
{
|
|
struct l_dbus *dbus = dbus_get_bus();
|
|
|
|
l_dbus_unregister_interface(dbus, IWD_AGENT_MANAGER_INTERFACE);
|
|
|
|
l_queue_destroy(agents, agent_free);
|
|
agents = NULL;
|
|
}
|
|
|
|
void agent_shutdown(void)
|
|
{
|
|
l_queue_foreach_remove(agents, release_agent, NULL);
|
|
}
|
|
|
|
IWD_MODULE(agent, agent_init, agent_exit);
|