DBUS发送接收数据(下)

1、编译后,由于没有进行配置,默认是无法运行的。
为了可以正常运行,增加或修改下面的配置文件即可。
/etc/dbus-1.0/system-local.conf

<!-- This configuration file controls the systemwide message bus.
     Add a system-local.conf and edit that rather than changing this 
     file directly. -->

<!-- Note that there are any number of ways you can hose yourself
     security-wise by screwing up this file; in particular, you
     probably don't want to listen on any more addresses, add any more
     auth mechanisms, run as a different user, etc. -->

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- Our well-known bus type, do not change this -->
  <type>system</type>

  <!-- Run as special user -->
  <user>messagebus</user>

  <!-- Fork into daemon mode -->
  <fork/>

  <!-- We use system service launching using a helper -->
  <standard_system_servicedirs/>

  <!-- This is a setuid helper that is used to launch system services -->
  <servicehelper>/usr/lib/dbus-1.0/dbus-daemon-launch-helper</servicehelper>

  <!-- Write a pid file -->
  <pidfile>/var/run/dbus/pid</pidfile>

  <!-- Enable logging to syslog -->
  <syslog/>

  <!-- Only allow socket-credentials-based authentication -->
  <auth>EXTERNAL</auth>

  <!-- Only listen on a local socket. (abstract=/path/to/socket 
       means use abstract namespace, don't really create filesystem 
       file; only Linux supports this. Use path=/whatever on other 
       systems.) -->
  <listen>unix:path=/var/run/dbus/system_bus_socket</listen>

  <policy context="default">
    <!-- All users can connect to system bus -->
    <allow user="*"/>

    <!-- Holes must be punched in service configuration files for
         name ownership and sending method calls -->
    <allow own="*"/>
    <allow send_type="method_call"/>

    <!-- Signals and reply messages (method returns, errors) are allowed
         by default -->
    <allow send_type="signal"/>
    <allow send_requested_reply="true" send_type="method_return"/>
    <allow send_requested_reply="true" send_type="error"/>

    <!-- All messages may be received by default -->
    <allow receive_type="method_call"/>
    <allow receive_type="method_return"/>
    <allow receive_type="error"/>
    <allow receive_type="signal"/>

    <!-- Allow anyone to talk to the message bus -->
    <allow send_destination="org.freedesktop.DBus"/>
    <!-- But disallow some specific bus services -->
    <deny send_destination="org.freedesktop.DBus"
          send_interface="org.freedesktop.DBus"
          send_member="UpdateActivationEnvironment"/>
    <deny send_destination="org.freedesktop.DBus"
          send_interface="org.freedesktop.systemd1.Activator"/>
  </policy>

  <!-- Only systemd, which runs as root, may report activation failures. -->
  <policy user="root">
    <allow send_destination="org.freedesktop.DBus"
           send_interface="org.freedesktop.systemd1.Activator"/>
  </policy>

  <!-- Config files are placed here that among other things, punch 
       holes in the above policy for specific services. -->
  <includedir>system.d</includedir>

  <include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>

</busconfig>

2、测试消息发送
服务端:

$./testdbus_s.bin receive
Listening for signals
Match rule sent
Got Signal with value: Hello
Got Signal with value: Hi
Bye......

客户端:

$./testdbus_s.bin send Hello
Sending signal with value: Hello
Signal Sent

$./testdbus_s.bin send Hi
Sending signal with value: Hi
Signal Sent

$./testdbus_s.bin send Bye
Sending signal with value: Bye
Signal Sent

3、测试方法调用
服务端:

$./testdbus_s.bin listen
Listening for method calls
Method Invoked with value: Hello
Method Invoked with value: Hi
Bye......

客户端:

$./testdbus_s.bin query Hello
Calling remote method with Hello
Request Sent
Got Reply: 1, 21614

$./testdbus_s.bin query Hi
Calling remote method with Hi
Request Sent
Got Reply: 1, 21614

$./testdbus_s.bin query Bye
Calling remote method with Bye
Request Sent
Got Reply: 1, 21614

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