用于在Ubuntu上接收具有接口名称的网络接口上/下通知的C ++库

时间：2017-10-24 11:46:55

标签： dbus gdbus

这篇文章有两个问题。 1.特定网络设备上的网络接口上/下通知 2.列出网络设备。

请参阅下文，了解我提供的答案。 （感谢Velkan帮助我实现这个）

我正在寻找一个c ++库，它在Ubuntu机器上接收带有接口名称的网络接口上/下事件通知。我的同事们已经要求我使用dbus接口。使用下面的链接相同，只是通知没有接口名称的任何接口up / down事件。

https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/examples/C/glib/monitor-nm-state-gdbus.c

我正在谷歌搜索一段时间，我找不到正确的例子，甚至dbus文档也不是直截了当或不提供我正在寻找的信息。

任何有关这方面的帮助都会非常有帮助。

先谢谢

2 个答案:

答案 0 :(得分：0)

我看了d-feet实用程序。

在＆＃39;系统总线＆＃39; /org/freedesktop/NetworkManager信号为DeviceAdded。

/org/freedesktop/NetworkManager/Devices/1事情有：

    {li> Interface org.freedesktop.NetworkManager.Device 中的字符串 {li> Carrier布尔和PropertiesChanged信号位于org.freedesktop.NetworkManager.Device.Wired，org.freedesktop.NetworkManager.Device.Bridge，org.freedesktop.NetworkManager.Device.Adsl ......

因此，获取NetworkManager对象，收听设备列表的修改，订阅将出现的当前设备和设备的PropertiesChanged，注意Carrier属性。

如果要检测接口已启动但未分配IP（或者可能处于其他某种中间状态），请查看其他属性。

如果你正在使用Ubuntu的服务器版本（你不是），那么我认为它没有使用NetworkManager，因此它的D-Bus接口可用性稍差 - { {1}}。

DeviceAdded / DeviceRemoved的Shell示例：

org.freedesktop.network1

插入Wi-Fi USB密钥时：

$ dbus-monitor --system "type='signal',interface='org.freedesktop.NetworkManager'"

发射了几个信号。因此，如果我们订阅signal time=1509615532.227067 sender=:1.8 -> destination=(null destination) serial=2051 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=DeviceAdded object path "/org/freedesktop/NetworkManager/Devices/10" signal time=1509615532.228150 sender=:1.8 -> destination=(null destination) serial=2056 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=PropertiesChanged array [ dict entry( string "AllDevices" variant array [ object path "/org/freedesktop/NetworkManager/Devices/0" object path "/org/freedesktop/NetworkManager/Devices/1" object path "/org/freedesktop/NetworkManager/Devices/2" object path "/org/freedesktop/NetworkManager/Devices/3" object path "/org/freedesktop/NetworkManager/Devices/4" object path "/org/freedesktop/NetworkManager/Devices/5" object path "/org/freedesktop/NetworkManager/Devices/6" object path "/org/freedesktop/NetworkManager/Devices/8" object path "/org/freedesktop/NetworkManager/Devices/10" ] ) dict entry( string "Devices" variant array [ object path "/org/freedesktop/NetworkManager/Devices/0" object path "/org/freedesktop/NetworkManager/Devices/1" object path "/org/freedesktop/NetworkManager/Devices/2" object path "/org/freedesktop/NetworkManager/Devices/3" object path "/org/freedesktop/NetworkManager/Devices/4" object path "/org/freedesktop/NetworkManager/Devices/5" object path "/org/freedesktop/NetworkManager/Devices/6" object path "/org/freedesktop/NetworkManager/Devices/8" object path "/org/freedesktop/NetworkManager/Devices/10" ] ) ] signal time=1509615533.253596 sender=:1.8 -> destination=(null destination) serial=2072 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=PropertiesChanged array [ dict entry( string "WirelessEnabled" variant boolean false ) ] signal time=1509615533.287235 sender=:1.8 -> destination=(null destination) serial=2080 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=PropertiesChanged array [ dict entry( string "ActiveConnections" variant array [ object path "/org/freedesktop/NetworkManager/ActiveConnection/3" object path "/org/freedesktop/NetworkManager/ActiveConnection/2" object path "/org/freedesktop/NetworkManager/ActiveConnection/1" object path "/org/freedesktop/NetworkManager/ActiveConnection/0" ] ) ] 或DeviceAdded，我们可以推断出我们也需要观看设备＃10。

当它被删除时：

PropertiesChanged

相同的信号：＃10已经消失。

或订阅signal time=1509615612.892305 sender=:1.8 -> destination=(null destination) serial=2086 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=DeviceRemoved object path "/org/freedesktop/NetworkManager/Devices/10" signal time=1509615612.893697 sender=:1.8 -> destination=(null destination) serial=2089 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=PropertiesChanged array [ dict entry( string "ActiveConnections" variant array [ object path "/org/freedesktop/NetworkManager/ActiveConnection/3" object path "/org/freedesktop/NetworkManager/ActiveConnection/2" object path "/org/freedesktop/NetworkManager/ActiveConnection/1" object path "/org/freedesktop/NetworkManager/ActiveConnection/0" ] ) dict entry( string "AllDevices" variant array [ object path "/org/freedesktop/NetworkManager/Devices/0" object path "/org/freedesktop/NetworkManager/Devices/1" object path "/org/freedesktop/NetworkManager/Devices/2" object path "/org/freedesktop/NetworkManager/Devices/3" object path "/org/freedesktop/NetworkManager/Devices/4" object path "/org/freedesktop/NetworkManager/Devices/5" object path "/org/freedesktop/NetworkManager/Devices/6" object path "/org/freedesktop/NetworkManager/Devices/8" ] ) dict entry( string "Devices" variant array [ object path "/org/freedesktop/NetworkManager/Devices/0" object path "/org/freedesktop/NetworkManager/Devices/1" object path "/org/freedesktop/NetworkManager/Devices/2" object path "/org/freedesktop/NetworkManager/Devices/3" object path "/org/freedesktop/NetworkManager/Devices/4" object path "/org/freedesktop/NetworkManager/Devices/5" object path "/org/freedesktop/NetworkManager/Devices/6" object path "/org/freedesktop/NetworkManager/Devices/8" ] ) ] signal time=1509615612.910829 sender=:1.8 -> destination=(null destination) serial=2095 path=/org/freedesktop/NetworkManager; interface=org.freedesktop.NetworkManager; member=PropertiesChanged array [ dict entry( string "WirelessEnabled" variant boolean true ) ] 和DeviceAdded仅获取它们：

DeviceRemoved

答案 1 :(得分：0)

任何想要工作代码示例的人都可以在问题（https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/examples/C/glib/monitor-nm-state-gdbus.c）中共享的链接中替换下面给出的类似行。

在特定设备上收听/关闭事件的代码段 这里我刚刚将对象路径parm值更改为

  • /组织/的freedesktop /网络管理器/设备/ 0

  • /组织/的freedesktop /网络管理器/设备/ 1

    proxy = g_dbus_proxy_new_for_bus_sync（G_BUS_TYPE_SYSTEM，                                            旗帜，                                            NULL，/ * GDBusInterfaceInfo /                                            ＆＃34; org.freedesktop.NetworkManager＆＃34 ;,                                            的 的＆＃34; /组织/的freedesktop /网络管理器/设备/ 1＆＃34; ，                                            ＆＃34; org.freedesktop.NetworkManager.Device＆＃34 ;,                                            NULL，/ GCancellable * /                                            ＆安培;错误）;

用于列出可用设备的代码段。 

proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
                                       flags,
                                       NULL, /* GDBusInterfaceInfo */
                                       "org.freedesktop.NetworkManager",
                                       "/org/freedesktop/NetworkManager",
                                       "org.freedesktop.NetworkManager",
                                       NULL, /* GCancellable */
                                       &error);

ret = g_dbus_proxy_call_sync (proxy,
                              "GetDevices",
                              NULL,
                              G_DBUS_CALL_FLAGS_NONE, -1,
                              NULL, &error);
if (!ret) {
    g_dbus_error_strip_remote_error (error);
    g_print ("ListConnections failed: %s\n", error->message);
    g_error_free (error);
    return;
}

g_variant_get (ret, "(^ao)", &paths);
g_variant_unref (ret);

for (i = 0; paths[i]; i++)
    g_print ("%s\n", paths[i]);

网络设备列表的输出（我的机器中有2张nic卡）

/组织/的freedesktop /网络管理器/设备/ 0

/组织/的freedesktop /网络管理器/设备/ 1

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