[Buildroot] root password and dhcp

[Buildroot] root password and dhcp

[cem akpolat]

Dear all,

I have compiled a new file system via buildroot and modified the .cpio
according to my requirements, then repack it and run with the linux kernel.

My first question how can I access via ssh without root password? For
instance in openwrt file system, it is possible to access firstly through
telnet, if required, you can assign a password after the telnet connection.
Does buildroot provide the same functionality?

Secondly, it seems that the dhcp doesn't work well, because even though the
users connected to hostapd (I can see the messages), the assignment of the
ip doesn't take place. What could be possible issue here? I am using dnsmaq
and dhcp packages and all configurations are defined actually in
dnsmasq.conf.

Here is the configuration file content:

dhcp-leasefile=/var/tmp/dnsmasq.leases
dhcp-range=wlan0,192.168.126.10,192.168.126.250,1m
resolv-file=/etc/resolv.dnsmasq.conf


Thanks,

Cem Akpolat
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[Buildroot] root password and dhcp

[Thomas De Schampheleire]

Hi Cem,

On Fri, May 23, 2014 at 4:10 PM, cem akpolat <akpolatcem@gmail.com> wrote:
> Dear all,
>
> I have compiled a new file system via buildroot and modified the .cpio
> according to my requirements, then repack it and run with the linux kernel.
>
> My first question how can I access via ssh without root password? For
> instance in openwrt file system, it is possible to access firstly through
> telnet, if required, you can assign a password after the telnet connection.
> Does buildroot provide the same functionality?

You can either set the root password in the buildroot configuration
(but it will be stored in the config file in plaintext, so for a
non-personal project that may not be ok) or you can update the
/etc/shadow file from a post-build script, see the presentation
http://elinux.org/images/2/2a/Using-buildroot-real-project.pdf slide
25.

>
> Secondly, it seems that the dhcp doesn't work well, because even though the
> users connected to hostapd (I can see the messages), the assignment of the
> ip doesn't take place. What could be possible issue here? I am using dnsmaq
> and dhcp packages and all configurations are defined actually in
> dnsmasq.conf.
>
> Here is the configuration file content:
>
> dhcp-leasefile=/var/tmp/dnsmasq.leases
> dhcp-range=wlan0,192.168.126.10,192.168.126.250,1m
> resolv-file=/etc/resolv.dnsmasq.conf
>

I don't think I can help you here (no particular dhcp experience in
Buildroot) but I think it is useful for other developers if you could
paste some relevant parts of the log here.

Best regards,
Thomas

[Buildroot] root password and dhcp

[Gustavo Zacarias]

On 05/23/2014 11:10 AM, cem akpolat wrote:

> Dear all,
> 
> I have compiled a new file system via buildroot and modified the .cpio
> according to my requirements, then repack it and run with the linux kernel. 
> 
> My first question how can I access via ssh without root password? For
> instance in openwrt file system, it is possible to access firstly
> through telnet, if required, you can assign a password after the telnet
> connection. Does buildroot provide the same functionality? 

You could probably wrap something up to do that with some scripting.
Why are you editing the cpio by hand?
You could do all your customization in a post build script.

> Secondly, it seems that the dhcp doesn't work well, because even though
> the users connected to hostapd (I can see the messages), the assignment
> of the ip doesn't take place. What could be possible issue here? I am
> using dnsmaq and dhcp packages and all configurations are defined
> actually in dnsmasq.conf.
> 
> Here is the configuration file content:
> 
> dhcp-leasefile=/var/tmp/dnsmasq.leases
> dhcp-range=wlan0,192.168.126.10,192.168.126.250,1m
> resolv-file=/etc/resolv.dnsmasq.conf

Well, you're somewhat light on details so we're left here to guess.
One possibility is that your dnsmasq package has dhcp support disabled,
another possibility is that your wlan0 doesn't belong to a proper
subnet/hasn't got an ip address configured at all to match that range.
Again, i can just guess without some proper information.
Regards.

[Buildroot] Fwd: root password and dhcp

[cem akpolat]

> 
> 
> On 23 May 2014, at 19:42, Gustavo Zacarias <gustavo@zacarias.com.ar> wrote:
> 
>> On 05/23/2014 11:10 AM, cem akpolat wrote:
>> 
>>> Dear all,
>>> 
>>> I have compiled a new file system via buildroot and modified the .cpio
>>> according to my requirements, then repack it and run with the linux kernel. 
>>> 
>>> My first question how can I access via ssh without root password? For
>>> instance in openwrt file system, it is possible to access firstly
>>> through telnet, if required, you can assign a password after the telnet
>>> connection. Does buildroot provide the same functionality? 
>> 
>> You could probably wrap something up to do that with some scripting.
>> Why are you editing the cpio by hand?
>> You could do all your customization in a post build script.
> 
> I will definitely do that, since each time opening the file system costs only time.
>> 
>>> Secondly, it seems that the dhcp doesn't work well, because even though
>>> the users connected to hostapd (I can see the messages), the assignment
>>> of the ip doesn't take place. What could be possible issue here? I am
>>> using dnsmaq and dhcp packages and all configurations are defined
>>> actually in dnsmasq.conf.
>>> 
>>> Here is the configuration file content:
>>> 
>>> dhcp-leasefile=/var/tmp/dnsmasq.leases
>>> dhcp-range=wlan0,192.168.126.10,192.168.126.250,1m
>>> resolv-file=/etc/resolv.dnsmasq.conf
>> 
>> Well, you're somewhat light on details so we're left here to guess.
>> One possibility is that your dnsmasq package has dhcp support disabled,
>> another possibility is that your wlan0 doesn't belong to a proper
>> subnet/hasn't got an ip address configured at all to match that range.
>> Again, i can just guess without some proper information.
>> Regards.
> 
> Regarding dnsmasq configuration, I enabled the dhcp support of dnsmasq, and dnsmasq actually tries to run dhcp, but the following error arises:
> 
> dnsmasq: failed to bind DHCP server socket: Address already in use
> 
> At that point, I wonder is there another dhcp server running at the background? Even if  this could be the case, dnsmasq stops all dhcp server and then restart with respect to the given configurations.
> Apart from dhsmasq package, I added also dhcp-relay and dhcp-server which are under dhcp package. Can dhcp-server lead to the conflict in this case ? 
> 
> Thank you for all recommendations, they helped a lot!
> 
> BR,
> Cem

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[Buildroot] Fwd: root password and dhcp

[Sagaert Johan]

 
  _____  

Van: buildroot-bounces at busybox.net [mailto:buildroot-bounces at busybox.net] Namens cem akpolat
Verzonden: zaterdag 24 mei 2014 3:37
Aan: buildroot at busybox.net
Onderwerp: [Buildroot] Fwd: root password and dhcp





On 23 May 2014, at 19:42, Gustavo Zacarias <gustavo@zacarias.com.ar> wrote:


On 05/23/2014 11:10 AM, cem akpolat wrote:



Dear all,

I have compiled a new file system via buildroot and modified the .cpio
according to my requirements, then repack it and run with the linux kernel. 

My first question how can I access via ssh without root password? For
instance in openwrt file system, it is possible to access firstly
through telnet, if required, you can assign a password after the telnet
connection. Does buildroot provide the same functionality?  
 

I believe that there is a dropbear command line option to allow ssh root login without password.


You could probably wrap something up to do that with some scripting.
Why are you editing the cpio by hand?
You could do all your customization in a post build script.



I will definitely do that, since each time opening the file system costs only time.


Secondly, it seems that the dhcp doesn't work well, because even though
the users connected to hostapd (I can see the messages), the assignment
of the ip doesn't take place. What could be possible issue here? I am
using dnsmaq and dhcp packages and all configurations are defined
actually in dnsmasq.conf. 
I personaly use udhcpc from busybox,, added -b so it forks to background 
 if the cable is not connected, or dhcp is not reachable at boot time. 
 Works fine for me. 

Here is the configuration file content:

dhcp-leasefile=/var/tmp/dnsmasq.leases
dhcp-range=wlan0,192.168.126.10,192.168.126.250,1m
resolv-file=/etc/resolv.dnsmasq.conf



Well, you're somewhat light on details so we're left here to guess.
One possibility is that your dnsmasq package has dhcp support disabled,
another possibility is that your wlan0 doesn't belong to a proper
subnet/hasn't got an ip address configured at all to match that range.
Again, i can just guess without some proper information.
Regards.



Regarding dnsmasq configuration, I enabled the dhcp support of dnsmasq, and dnsmasq actually tries to run dhcp, but the following
error arises:

dnsmasq: failed to bind DHCP server socket: Address already in use


At that point, I wonder is there another dhcp server running at the background? Even if  this could be the case, dnsmasq stops all
dhcp server and then restart with respect to the given configurations.
Apart from dhsmasq package, I added also dhcp-relay and dhcp-server which are under dhcp package. Can dhcp-server lead to the
conflict in this case ? 

Thank you for all recommendations, they helped a lot!

BR,
Cem


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[Buildroot] root password and dhcp

[Gustavo Zacarias]

On 05/23/2014 10:35 PM, cem akpolat wrote:

>> Well, you're somewhat light on details so we're left here to guess.
>> One possibility is that your dnsmasq package has dhcp support disabled,
>> another possibility is that your wlan0 doesn't belong to a proper
>> subnet/hasn't got an ip address configured at all to match that range.
>> Again, i can just guess without some proper information.
>> Regards.
> 
> Regarding dnsmasq configuration, I enabled the dhcp support of dnsmasq,
> and dnsmasq actually tries to run dhcp, but the following error arises:
> 
> *dnsmasq: failed to bind DHCP server socket: Address already in use*
> *
> *
> At that point, I wonder is there another dhcp server running at the
> background? Even if  this could be the case, dnsmasq stops all dhcp
> server and then restart with respect to the given configurations.
> Apart from dhsmasq package, I added also dhcp-relay and dhcp-server
> which are under dhcp package. Can dhcp-server lead to the conflict in
> this case ? 
> 
> Thank you for all recommendations, they helped a lot!

Hi.
Remember to copy the mailing list too, someone else might be interested
in the future.
Well, there's your problem then, you enable the dhcp package which acts
as a dhcp server and dnsmasq which does so as well, so you can't have
both doing the same job.
So either you just use one by unselecting the other or if you need both
you'll need to tell each other to not meddle with the interface the
other is using via configuration files (interface=xx in dnsmasq.conf,
for dhcp i believe you need an invocation option for that).
My guess is you are trying both to get a result and this happened, and
that you only want dnsmasq around.
Regards.

[Buildroot] root password and dhcp

[cem akpolat]

Hi Gustavo,


Actually, the last sentence "My guess is you are trying both to get a
result and this happened, and
that you only want dnsmasq around." explains that I want to do. Therefore I
will try to disable to dhcp/dhcp-server and than compile the source code
again. I was thinking, it might be case that dnsmasq uses dhcp-server,
however, in this case dhcp-server would have been a dependecy for dnsmasq.

As soon as I compile and attempt to run it, I will inform you, thank you
again.

Regards.

P.S: Sorry for the mailing list, I noticed yesterday, and then
send separately another mail to the mailing list.

Cem


Cem Akpolat


On Sat, May 24, 2014 at 12:15 PM, Gustavo Zacarias
<gustavo@zacarias.com.ar>wrote:

> On 05/23/2014 10:35 PM, cem akpolat wrote:
>
> >> Well, you're somewhat light on details so we're left here to guess.
> >> One possibility is that your dnsmasq package has dhcp support disabled,
> >> another possibility is that your wlan0 doesn't belong to a proper
> >> subnet/hasn't got an ip address configured at all to match that range.
> >> Again, i can just guess without some proper information.
> >> Regards.
> >
> > Regarding dnsmasq configuration, I enabled the dhcp support of dnsmasq,
> > and dnsmasq actually tries to run dhcp, but the following error arises:
> >
> > *dnsmasq: failed to bind DHCP server socket: Address already in use*
> > *
> > *
> > At that point, I wonder is there another dhcp server running at the
> > background? Even if  this could be the case, dnsmasq stops all dhcp
> > server and then restart with respect to the given configurations.
> > Apart from dhsmasq package, I added also dhcp-relay and dhcp-server
> > which are under dhcp package. Can dhcp-server lead to the conflict in
> > this case ?
> >
> > Thank you for all recommendations, they helped a lot!
>
> Hi.
> Remember to copy the mailing list too, someone else might be interested
> in the future.
> Well, there's your problem then, you enable the dhcp package which acts
> as a dhcp server and dnsmasq which does so as well, so you can't have
> both doing the same job.
> So either you just use one by unselecting the other or if you need both
> you'll need to tell each other to not meddle with the interface the
> other is using via configuration files (interface=xx in dnsmasq.conf,
> for dhcp i believe you need an invocation option for that).
> My guess is you are trying both to get a result and this happened, and
> that you only want dnsmasq around.
> Regards.
>
>
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[Buildroot] root password and dhcp

[cem akpolat]

Hi,

After removing dhcp-server from the configuration list, I recompiled the
whole image and tested it again. However, the problem is still there, and
shows the same error "dnsmasq: failed to bind DHCP server socket: Address
already in use ". netstat result indicates that dnsmasq listens on 53 port
as below:

# netstat -anlp | grep -w LISTEN
tcp        0      0 0.0.0.0:1194            0.0.0.0:*               LISTEN
     1493/openvpn
tcp        0      0 0.0.0.0:53              0.0.0.0:*               LISTEN
     11794/dnsmasq
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
     1459/dropbear

That is a bit interesting. By the way, all files in the filesystem seem as
executable files, is that really normal ?


Another point that I didn't mention in the previous mails I am always
seeing "netlink: 20 bytes leftover after parsing attributes". This message
comes directly from netlink source code (
http://lxr.free-electrons.com/source/lib/nlattr.c). It seems as a bug. May
be I should open another topic for that.

Thank you,
Cem

Cem Akpolat


On Sat, May 24, 2014 at 12:29 PM, cem akpolat <akpolatcem@gmail.com> wrote:

> Hi Gustavo,
>
>
> Actually, the last sentence "My guess is you are trying both to get a
> result and this happened, and
> that you only want dnsmasq around." explains that I want to do. Therefore
> I will try to disable to dhcp/dhcp-server and than compile the source code
> again. I was thinking, it might be case that dnsmasq uses dhcp-server,
> however, in this case dhcp-server would have been a dependecy for dnsmasq.
>
> As soon as I compile and attempt to run it, I will inform you, thank you
> again.
>
> Regards.
>
> P.S: Sorry for the mailing list, I noticed yesterday, and then
> send separately another mail to the mailing list.
>
> Cem
>
>
> Cem Akpolat
>
>
> On Sat, May 24, 2014 at 12:15 PM, Gustavo Zacarias <
> gustavo at zacarias.com.ar> wrote:
>
>> On 05/23/2014 10:35 PM, cem akpolat wrote:
>>
>> >> Well, you're somewhat light on details so we're left here to guess.
>> >> One possibility is that your dnsmasq package has dhcp support disabled,
>> >> another possibility is that your wlan0 doesn't belong to a proper
>> >> subnet/hasn't got an ip address configured at all to match that range.
>> >> Again, i can just guess without some proper information.
>> >> Regards.
>> >
>> > Regarding dnsmasq configuration, I enabled the dhcp support of dnsmasq,
>> > and dnsmasq actually tries to run dhcp, but the following error arises:
>> >
>> > *dnsmasq: failed to bind DHCP server socket: Address already in use*
>> > *
>> > *
>> > At that point, I wonder is there another dhcp server running at the
>> > background? Even if  this could be the case, dnsmasq stops all dhcp
>> > server and then restart with respect to the given configurations.
>> > Apart from dhsmasq package, I added also dhcp-relay and dhcp-server
>> > which are under dhcp package. Can dhcp-server lead to the conflict in
>> > this case ?
>> >
>> > Thank you for all recommendations, they helped a lot!
>>
>> Hi.
>> Remember to copy the mailing list too, someone else might be interested
>> in the future.
>> Well, there's your problem then, you enable the dhcp package which acts
>> as a dhcp server and dnsmasq which does so as well, so you can't have
>> both doing the same job.
>> So either you just use one by unselecting the other or if you need both
>> you'll need to tell each other to not meddle with the interface the
>> other is using via configuration files (interface=xx in dnsmasq.conf,
>> for dhcp i believe you need an invocation option for that).
>> My guess is you are trying both to get a result and this happened, and
>> that you only want dnsmasq around.
>> Regards.
>>
>>
>
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[Buildroot] root password and dhcp

[cem akpolat]

Hi,

I figured out dhcp server issue when I noticed that wlan interface doesn't
get ip addresses. I am now using dnsmasq configuration ant it works fine.

About netlink message "netlink: 20 bytes leftover after parsing
attributes", it is still there.


Cem
Am 26.05.2014 12:05 schrieb "cem akpolat" <akpolatcem@gmail.com>:

> Hi,
>
> After removing dhcp-server from the configuration list, I recompiled the
> whole image and tested it again. However, the problem is still there, and
> shows the same error "dnsmasq: failed to bind DHCP server socket: Address
> already in use ". netstat result indicates that dnsmasq listens on 53 port
> as below:
>
> # netstat -anlp | grep -w LISTEN
> tcp        0      0 0.0.0.0:1194            0.0.0.0:*
> LISTEN      1493/openvpn
> tcp        0      0 0.0.0.0:53              0.0.0.0:*
> LISTEN      11794/dnsmasq
> tcp        0      0 0.0.0.0:22              0.0.0.0:*
> LISTEN      1459/dropbear
>
> That is a bit interesting. By the way, all files in the filesystem seem as
> executable files, is that really normal ?
>
>
> Another point that I didn't mention in the previous mails I am always
> seeing "netlink: 20 bytes leftover after parsing attributes". This message
> comes directly from netlink source code (
> http://lxr.free-electrons.com/source/lib/nlattr.c). It seems as a bug.
> May be I should open another topic for that.
>
> Thank you,
> Cem
>
> Cem Akpolat
>
>
> On Sat, May 24, 2014 at 12:29 PM, cem akpolat <akpolatcem@gmail.com>wrote:
>
>> Hi Gustavo,
>>
>>
>> Actually, the last sentence "My guess is you are trying both to get a
>> result and this happened, and
>> that you only want dnsmasq around." explains that I want to do. Therefore
>> I will try to disable to dhcp/dhcp-server and than compile the source code
>> again. I was thinking, it might be case that dnsmasq uses dhcp-server,
>> however, in this case dhcp-server would have been a dependecy for dnsmasq.
>>
>> As soon as I compile and attempt to run it, I will inform you, thank you
>> again.
>>
>> Regards.
>>
>>  P.S: Sorry for the mailing list, I noticed yesterday, and then
>> send separately another mail to the mailing list.
>>
>> Cem
>>
>>
>> Cem Akpolat
>>
>>
>> On Sat, May 24, 2014 at 12:15 PM, Gustavo Zacarias <
>> gustavo at zacarias.com.ar> wrote:
>>
>>> On 05/23/2014 10:35 PM, cem akpolat wrote:
>>>
>>> >> Well, you're somewhat light on details so we're left here to guess.
>>> >> One possibility is that your dnsmasq package has dhcp support
>>> disabled,
>>> >> another possibility is that your wlan0 doesn't belong to a proper
>>> >> subnet/hasn't got an ip address configured at all to match that range.
>>> >> Again, i can just guess without some proper information.
>>> >> Regards.
>>> >
>>> > Regarding dnsmasq configuration, I enabled the dhcp support of dnsmasq,
>>> > and dnsmasq actually tries to run dhcp, but the following error arises:
>>> >
>>> > *dnsmasq: failed to bind DHCP server socket: Address already in use*
>>> > *
>>> > *
>>> > At that point, I wonder is there another dhcp server running at the
>>> > background? Even if  this could be the case, dnsmasq stops all dhcp
>>> > server and then restart with respect to the given configurations.
>>> > Apart from dhsmasq package, I added also dhcp-relay and dhcp-server
>>> > which are under dhcp package. Can dhcp-server lead to the conflict in
>>> > this case ?
>>> >
>>> > Thank you for all recommendations, they helped a lot!
>>>
>>> Hi.
>>> Remember to copy the mailing list too, someone else might be interested
>>> in the future.
>>> Well, there's your problem then, you enable the dhcp package which acts
>>> as a dhcp server and dnsmasq which does so as well, so you can't have
>>> both doing the same job.
>>> So either you just use one by unselecting the other or if you need both
>>> you'll need to tell each other to not meddle with the interface the
>>> other is using via configuration files (interface=xx in dnsmasq.conf,
>>> for dhcp i believe you need an invocation option for that).
>>> My guess is you are trying both to get a result and this happened, and
>>> that you only want dnsmasq around.
>>> Regards.
>>>
>>>
>>
>
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