通过TCP连接到DBus服务 [英] Connect to DBus service via TCP

问题描述

我是进行进程间通信的新手。我需要您的帮助和明确的解释。我有2个应用程序。其中之一是服务，一个是客户。我使用QT / C ++编写它们。当他们在一台本地PC上工作时-一切都很好。但是我需要将它们分开。

I'm new in work with interprocess communication. I need you help and clear explanation. I have 2 applications. One of them is a service and one is a client. I've used QT/C++ to write them. When they are working on the one local PC - all is good. But I need to separate them.

因此，我在IP为192.30.82.101的PC上有一项服务。
我使用下一个代码将其连接到总线：

So, I have a service on the PC with IP 192.30.82.101. I connect it to bus using next code:

QDBusConnection connection = QDBusConnection::sessionBus();
connection.registerObject("/my/service/MyService", mySvc);
connection.registerService("my.service.MyService");

我在另一台IP为192.30.82.40的PC上也有一个客户端。
我使用以下代码连接客户端：

Also I have a client on the another PC with IP 192.30.82.40. I connect my client using the next code:

QDBusServiceWatcher serviceWatcher = new QDBusServiceWatcher(); 
serviceWatcher->setConnection(QDBusConnection::sessionBus());
serviceWatcher->addWatchedService("my.service.MyService");     

.....

    myServiceProxy = new local::MyService("my.service.MyService", 
                   "/my/service/MyService", QDBusConnection::sessionBus(), this);

我需要将IP 192.30.82.40的PC上的客户端连接到192.30 PC上的服务.82.101。我不知道该怎么做。我在论坛上找到了一些主题，但我仍然不知道该怎么办。

I need to connect my client on the PC with IP 192.30.82.40 to the service on the PC 192.30.82.101. I don't know how to do this. I've found a few topics on the forum but I still don't understand what to do.

所以，我发现的东西：

1. 在PC上我的位置在哪里服务我必须在/etc/dbus-1/session.conf中添加其他行：

< listen> tcp：host =< host>，port =< port>< / listen>

< listen& unix：tmpdir = / tmp< / listen>

< auth> ANONYMOUS< / auth> ;

< allow_anonymous />

这里我有一个问题：我必须在此处使用哪个IP地址（服务器或客户端）？ DBUS使用哪个端口（是默认端口还是如何检查它）？我试图设置客户端PC，服务PC和其他端口以及端口0的IP地址，但出现错误：无法绑定套接字 172.30.82.40:0：无法分配请求的地址。 / p>

Here I have a question: Which IP address I have to use here (server or client)? Which port is used for DBUS (is it default port or how I can check it)? I have tried to set an IP address of my client PC, my service PC and different ports, and port 0, but I've got an error: Failed to bind socket "172.30.82.40:0": Cannot assign requested address.

1. 在客户端，我必须使用相同的地址设置DBUS_SESSION_BUS_ADDRESS： export DBUS_SESSION_BUS_ADDRESS = tcp ：host =< host>，port =< port> 。

1. On the client side I have to set DBUS_SESSION_BUS_ADDRESS with the same address: export DBUS_SESSION_BUS_ADDRESS=tcp:host=<host>,port=<port>.

我试图用不同的端口（端口为0）执行此操作，因为这意味着-使用任何可用端口。但是我无法使用任何端口+ IP配置启动总线守护程序。

I've tried to do this with different ports, with 0 port, because this means - use any free port. But I cannot start bus daemon with any port+IP configuration.

此外，我还尝试使用以下代码将客户端QDBusServiceWatcher连接到总线：

Also I've tried to connect client QDBusServiceWatcher to bus using the next code:

serviceWatcher->setConnection(QDBusConnection::connectToBus("tcp:host=<host>,port=<port>", "session"));

不成功。
我不知道如何将它们彼此连接。
任何人都可以请我解释一下它应该如何运作吗？
我想清楚地了解它是如何工作的。

It was not successful. I have no idea how to connect them to each other. Can anybody, please, explain me how it should be, how does it work? I want to clearly understanding how does it work?

我将非常感谢您的帮助。我希望您的好意。

I will be very grateful for any help. I hope for your kindness.

更新
我发现了如何将客户端连接到DBus通过TCP的总线：

UPDATE I have found how to connect my client to DBus bus via TCP:

1. 在PC上，我的服务是在/ etc中添加其他行/dbus-1/session.conf：

< listen> tcp：host = localhost，bind = *，port = 6667，family = ipv4< / listen>

< listen> unix：tmpdir = / tmp< / listen>

< auth> ANONYMOUS< / auth>

< allow_anonymous />

应该添加PORT。我们可以在dbus配置文件中找到它。

Here we should add PORT. We can find it in dbus config file.

1. 在客户端，我必须将DBUS_SESSION_BUS_ADDRESS设置为相应的地址（IP的PC所在的服务）：
   导出DBUS_SESSION_BUS_ADDRESS = tcp：host = 192.50.88.10，port = 6667，family = ipv4 。

1. On the client side I have to set DBUS_SESSION_BUS_ADDRESS with corresponding address (IP of PC where is service): export DBUS_SESSION_BUS_ADDRESS=tcp:host=192.50.88.10,port=6667,family=ipv4.

仅此而已。我们可以检查它是否刚刚启动了dbus-monitor。

Thats all. We can check it just started dbus-monitor.

但是现在我遇到另一个问题：如何将客户端连接到我的服务？
我需要做更多的事情才能连接到我的服务。
我想这就像：

But now I have another issue: how to connect my client to my service? I need to do something more to connect to my service. I guess that this is something like:

QDBusConnection::connectToBus("tcp:host=<host>,port=<port>","connectionName");

我尝试使用任何随机名称进行连接，但这是不正确的。
所以，我的问题是-在哪里可以获得正确的连接名？

I've tried to connect with any random name, but this is not correct. So, my question is - where I can get correct connection name?

推荐答案

我的问题的正确答案是：

1. 在PC上，一个应用程序在其中添加了其他行
   /etc/dbus-1/session.conf：
   < listen> tcp：host = localhost，bind = *，port = 6667，family = ipv4< / listen>

< listen> unix：tmpdir = / tmp< / listen>

< auth> ANONYMOUS< / auth>

< allow_anonymous />

可以在dbus配置文件中找到正确的端口。

Correct port you can find in dbus config file.

需要在DBUS_SESSION_BUS_ADDRESS上设置
的对应地址（服务所在的PC的IP）：

导出DBUS_SESSION_BUS_ADDRESS = tcp：host = 192.50.88.10，port = 6667，family = ipv4 。

On the client side It's needed to set DBUS_SESSION_BUS_ADDRESS with corresponding address (IP of PC where is service):
export DBUS_SESSION_BUS_ADDRESS=tcp:host=192.50.88.10,port=6667,family=ipv4.

要在以下位置连接到会话还活着，您的远程应用程序使用下一个
con否定字符串：

To connect to session where is alive your remote app use the next connection string:

DBusConnection::connectToBus("tcp:host=192.50.88.10,port=6667", "qt_default_session_bus")); 

如何知道会话名称？我已经在服务中添加了日志：

How to know session name? I've added log in my service:

qDebug() << "Connection name: " << connection.name(); 

然后启动应用程序，复制打印的名称并将其设置在我的客户端中。

Then started app, copy printed name and set it in my client.

现在可以使用了！

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