[dbus]How to verify the capability of dbus IPC between machines
Pavel Strashkin
pavel.strashkin at gmail.com
Wed Nov 30 22:09:55 PST 2011
Add <allow_anonymous /> to configuration file. It is the step forward,
but what's next i don't know yet, need to investigate.
2011/11/30 yinxb <yinxiaobiao at gmail.com>:
> Hi Pavel Strashkin
>
> When I commented the <auth> tag of system.conf in host,the log
> seems different.
> send(4, "BEGIN\r\n", 7, MSG_NOSIGNAL) = 7 can be found in the
> log.It seems auth problem has been solved. Thanks.
> But the final result is the same.
> "Error org.freedesktop.DBus.Error.NoReply"
> ==========================
> send(4, "AUTH ANONYMOUS 6c696264627573203"..., 43, MSG_NOSIGNAL) = 43
> poll([{fd=4, events=POLLIN}], 1, -1) = 1 ([{fd=4, revents=POLLIN}])
> read(4, "OK aea9a11a911a04d6f9f17b7600000"..., 2048) = 37
> poll([{fd=4, events=POLLOUT}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
> send(4, "BEGIN\r\n", 7, MSG_NOSIGNAL) = 7
> poll([{fd=4, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=4, revents=POLLOUT}])
> sendmsg(4, {msg_name(0)=NULL,
> msg_iov(2)=[{"l\1\0\1\0\0\0\0\1\0\0\0u\0\0\0\1\1o\0\25\0\0\0/org/fre"...,
> 136}, {"", 0}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 136
> clock_gettime(CLOCK_MONOTONIC, {71916, 842663193}) = 0
> poll([{fd=4, events=POLLIN}], 1, 25000) = 1 ([{fd=4, revents=POLLIN}])
> read(4, "", 2048) = 0
> close(4) = 0
> write(2, "Error org.freedesktop.DBus.Error"..., 253Error
> org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible
> causes include: the remote application did not send a reply, the
> message bus security policy blocked the reply, the reply timeout
> expired, or the network connection was broken.
> ) = 253
> exit_group(1) = ?
> ======================
>
> 在 2011年12月1日 上午11:36，Pavel Strashkin <pavel.strashkin at gmail.com> 写道：
>> I have the latest 1.4.x. The command should be "DBUS_VERBOSE=1
>> dbus-send --address=tcp:host=127.0.0.1,port=12434 --print-reply
>> --type=method_call --dest=org.freedesktop.DBus /org/freedesktop/DBus
>> org.freedesktop.DBus.ListNames". If it doesn't work, try to run it via
>> strace: "strace dbus-send ...".
>>
>> 2011/11/30 yinxb <yinxiaobiao at gmail.com>:
>>> Hi Pavel Strashkin
>>>
>>> I downloaded the dbus-1.5.0.tar.gz from
>>> http://cgit.freedesktop.org/dbus/dbus/
>>> and ./configure --enable-verbose-mode and make & make install.
>>> when execute the commad metioned in your last mail,
>>> I cannot find debug info output.
>>>
>>> Also I tried to find the debug version of dbus,and dpkg the package.
>>> http://packages.ubuntu.com/maverick/dbus-1-dbg
>>> when use dbus-send,it tells me
>>> dbus-send: cannot execute binary file
>>>
>>> Would you please tell me what is the version of dbus & dbus debug.
>>> More,Could you kindly tell me the command works in your host and client
>>> ============
>>> dbus-send --address=... --print-reply
>>> --type=method_call --dest=org.freedesktop.DBus /org/freedesktop/DBus
>>> org.freedesktop.DBus.ListNames
>>> ============
>>>
>>> Thanks very much indeed
>>>
>>> 在 2011年11月30日 上午11:53，Pavel Strashkin <pavel.strashkin at gmail.com> 写道：
>>>> It only means that you can't use --address and --system (--session)
>>>> command line options together. --system and --session is kind of alias
>>>> for --address.
>>>>
>>>> Try the following call: dbus-send --address=... --print-reply
>>>> --type=method_call --dest=org.freedesktop.DBus /org/freedesktop/DBus
>>>> org.freedesktop.DBus.ListNames
>>>>
>>>> Put right address there. Also try the same call on localhost where
>>>> you're listening on 12434 port, use 127.0.0.1 or localhost as a host
>>>> name.
>>>>
>>>> 2011/11/29 yinxb <yinxiaobiao at gmail.com>:
>>>>> It seems the host(remote pc) is listenning the 12434 port.
>>>>>
>>>>> another question,when I execute the following command
>>>>> dbus-send --address=tcp:host=10.239.58.116,port=12434 --system
>>>>> --type=method_call --print-reply --dest=org.gnome.DisplayManager
>>>>> /org/gnome/DisplayManager/Manager
>>>>> org.gnome.DisplayManager.Manager.GetDisplays
>>>>>
>>>>> Get the messages:
>>>>> ----------------------
>>>>> --address" may not be used with "--system" or "--session"
>>>>> ---------------------
>>>>> Does it mean remote dbus cannot call system bus and session bus in host?
>>>>> and then what kind of bus can be used in the remote case?
>>>>>
>>>>> ps:
>>>>> DisplayManager is system bus
>>>>>
>>>>> 在 2011年11月30日 上午10:04，yinxb <yinxiaobiao at gmail.com> 写道：
>>>>>> get the following list in local PC
>>>>>> ----------------------
>>>>>> tcp 0 0 0.0.0.0:2049 0.0.0.0:*
>>>>>> LISTEN -
>>>>>> tcp 0 0 0.0.0.0:59747 0.0.0.0:*
>>>>>> LISTEN -
>>>>>> tcp 0 0 0.0.0.0:40967 0.0.0.0:*
>>>>>> LISTEN 1554/dbus-daemon
>>>>>> tcp 0 0 0.0.0.0:111 0.0.0.0:*
>>>>>> LISTEN 617/portmap
>>>>>> tcp 0 0 0.0.0.0:22 0.0.0.0:*
>>>>>> LISTEN 586/sshd
>>>>>> tcp 0 0 127.0.0.1:631 0.0.0.0:*
>>>>>> LISTEN 984/cupsd
>>>>>> tcp 0 0 0.0.0.0:59962 0.0.0.0:*
>>>>>> LISTEN 699/rpc.statd
>>>>>> tcp 0 0 0.0.0.0:52732 0.0.0.0:*
>>>>>> LISTEN 927/rpc.mountd
>>>>>> tcp 0 0 0.0.0.0:60317 0.0.0.0:*
>>>>>> LISTEN 1768/dbus-daemon
>>>>>> tcp6 0 0 :::22 :::*
>>>>>> LISTEN 586/sshd
>>>>>> tcp6 0 0 ::1:631 :::*
>>>>>> LISTEN 984/cupsd
>>>>>> --------------------------
>>>>>>
>>>>>> in remotePC
>>>>>> -------------------------
>>>>>> tcp 0 0 0.0.0.0:2049 0.0.0.0:*
>>>>>> LISTEN -
>>>>>> tcp 0 0 0.0.0.0:53097 0.0.0.0:*
>>>>>> LISTEN 770/rpc.statd
>>>>>> tcp 0 0 0.0.0.0:34474 0.0.0.0:*
>>>>>> LISTEN 1125/rpc.mountd
>>>>>> tcp 0 0 0.0.0.0:111 0.0.0.0:*
>>>>>> LISTEN 730/portmap
>>>>>> tcp 0 0 0.0.0.0:12434 0.0.0.0:*
>>>>>> LISTEN 512/dbus-daemon
>>>>>> tcp 0 0 0.0.0.0:33267 0.0.0.0:*
>>>>>> LISTEN -
>>>>>> tcp 0 0 0.0.0.0:22 0.0.0.0:*
>>>>>> LISTEN 1559/sshd
>>>>>> tcp 0 0 127.0.0.1:631 0.0.0.0:*
>>>>>> LISTEN 1380/cupsd
>>>>>> tcp6 0 0 :::22 :::*
>>>>>> LISTEN 1559/sshd
>>>>>> tcp6 0 0 ::1:631 :::*
>>>>>> LISTEN 1380/cupsd
>>>>>> -------------------------
>>>>>> 2011/11/30, Pavel Strashkin <pavel.strashkin at gmail.com>:
>>>>>>> What about "netstat -nlpt"? Does it show that some process is
>>>>>>> listening on 12434 TCP/IP port?
>>>>>>>
>>>>>>> 2011/11/29 yinxb <yinxiaobiao at gmail.com>:
>>>>>>>> Hi Pavel Strashkin
>>>>>>>>
>>>>>>>> It seems that dbus-monitor did not connect the specified host & port.
>>>>>>>>
>>>>>>>> When execute the command in remotePC or lolcaPC:
>>>>>>>> dbus-monitor --address tcp:host=xx.xxx.xx.116,port=12434
>>>>>>>> only get the register failed message
>>>>>>>> ========
>>>>>>>> Failed to register connection to bus at
>>>>>>>> tcp:host=10.239.58.116,port=12434: Did not receive a reply. Possible
>>>>>>>> causes include: the remote application did not send a reply, the
>>>>>>>> message bus security policy blocked the reply, the reply timeout
>>>>>>>> expired, or the network connection was broken.
>>>>>>>> ========
>>>>>>>> I even turned off the firewall on both remotePC and localPC and
>>>>>>>> still get the same result.
>>>>>>>>
>>>>>>>> 在 2011年11月30日 上午3:34，Pavel Strashkin <pavel.strashkin at gmail.com> 写道：
>>>>>>>>> Does dbus-monitor successfully connect to dbus-daemon on specified host &
>>>>>>>>> port?
>>>>>>>>>
>>>>>>>>> 2011/11/28 yinxb <yinxiaobiao at gmail.com>:
>>>>>>>>>> In addition,dbus-monitor in the remote PC cannot find any info related
>>>>>>>>>> the dbus-send.
>>>>>>>>>>
>>>>>>>>>> 在 2011年11月29日 上午10:38，yinxb <yinxiaobiao at gmail.com> 写道：
>>>>>>>>>>> Hi Thiago Macieira and Pavel
>>>>>>>>>>>
>>>>>>>>>>> Thanks for your reply.
>>>>>>>>>>>
>>>>>>>>>>> As metioned in your mail,I did the following steps:
>>>>>>>>>>> 1.Romote PC:
>>>>>>>>>>> Config /etc/dbus-1/system.conf.
>>>>>>>>>>> Add listen tcp:host=0.0.0.0,port=12434
>>>>>>>>>>>
>>>>>>>>>>> 2.Local PC:
>>>>>>>>>>> dbus-send --address=tcp:host=xx.xxx.xx.116,port=12434 --print-reply
>>>>>>>>>>> --dest=org.gnome.PowerManager
>>>>>>>>>>> /org/ayatana/NotificationItem/gnome_power_manager/Menu
>>>>>>>>>>> org.freedesktop.Dbus.Introspectable.Introspect
>>>>>>>>>>>
>>>>>>>>>>> after that,I got the following message:
>>>>>>>>>>> Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply.
>>>>>>>>>>> Possible causes include: the remote application did not send a reply,
>>>>>>>>>>> the message bus security policy blocked the reply, the reply timeout
>>>>>>>>>>> expired, or the network connection was broken.
>>>>>>>>>>>
>>>>>>>>>>> Can you figure out what is missing or wrong with my steps?
>>>>>>>>>>>
>>>>>>>>>>> ps:
>>>>>>>>>>> telnet can connect the remote PC (xx.xxx.xx.116).
>>>>>>>>>>>
>>>>>>>>>>> 2011/11/29 Thiago Macieira <thiago at kde.org>:
>>>>>>>>>>>> On Monday, 28 de November de 2011 15.59.42, 尹YinXiaobiao wrote:
>>>>>>>>>>>>> Hi all
>>>>>>>>>>>>> I am a newbie at Dbus and this is my first mail in this
>>>>>>>>>>>>> maillist.
>>>>>>>>>>>>> By some investigate and look at the source code,I know that dbus
>>>>>>>>>>>>> is using socket(tcp & unix domain socket) to transfer data.
>>>>>>>>>>>>> So it is possible for communication between two machines(or VM).
>>>>>>>>>>>>
>>>>>>>>>>>> Right, it's possible.
>>>>>>>>>>>>
>>>>>>>>>>>>> Now my question is how to vevify this capability by dbus-send
>>>>>>>>>>>>> command.
>>>>>>>>>>>>> Can anyone give me a hint?
>>>>>>>>>>>>
>>>>>>>>>>>> Just send the message you want to send. You know the address of the
>>>>>>>>>>>> bus server
>>>>>>>>>>>> to connect to, so pass it in the --address= option. You know that
>>>>>>>>>>>> address
>>>>>>>>>>>> because you configured the other machine with it.
>>>>>>>>>>>>
>>>>>>>>>>>>> Someone tell me that dbus do not listen on TCP by default,how to
>>>>>>>>>>>>> enable TCP listen?
>>>>>>>>>>>>
>>>>>>>>>>>> Create your own config file and change the <listen> directive to be on
>>>>>>>>>>>> TCP.
>>>>>>>>>>>>
>>>>>>>>>>>> Remember: D-Bus TCP is unauthenticated an unencrypted. It accepts
>>>>>>>>>>>> connections
>>>>>>>>>>>> from anywhere and trusts it blindly.
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>>>>>>>>>>>> Software Architect - Intel Open Source Technology Center
>>>>>>>>>>>> PGP/GPG: 0x6EF45358; fingerprint:
>>>>>>>>>>>> E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358
>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> dbus mailing list
>>>>>>>>>>>> dbus at lists.freedesktop.org
>>>>>>>>>>>> http://lists.freedesktop.org/mailman/listinfo/dbus
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> dbus mailing list
>>>>>>>>>> dbus at lists.freedesktop.org
>>>>>>>>>> http://lists.freedesktop.org/mailman/listinfo/dbus
>>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
More information about the dbus
mailing list