[Buildroot] Problem using net-snmp and Buildroot

[Buildroot] Problem using net-snmp and Buildroot

[Luca Altobelli]

Dear Sirs
    I'm using buildroot-2009.08 and I need net-snmp (currently I'm using 
version 5.4.2.1) installed on my target system. When compiling no 
problem encountered but,  if I try to launch /snmpd/ on my target 
system, it gives the message "cannot find libc.so.6". I have libc.so.6 
on my host system, no trace of it on the target.
Attached is my Buildroot configuration.

Yours sincerely
Altobelli Luca.
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[Buildroot] Problem using net-snmp and Buildroot

[Peter Korsgaard]

>>>>> "Luca" == Luca Altobelli <LUCA.ALTOBELLI@dimacosystems.com> writes:

 Luca> Dear Sirs
 Luca> ??? I'm using buildroot-2009.08 and I need net-snmp (currently I'm using
 Luca> version 5.4.2.1) installed on my target system. When compiling no problem
 Luca> encountered but,? if I try to launch snmpd on my target system, it gives the
 Luca> message "cannot find libc.so.6". I have libc.so.6 on my host system, no trace

I cannot reproduce it here with x86-64 (same as my host) or i386 with
2009.11-rc1. We did update the netsnmp package after 2009.08, could you
give 2009.11-rc1 a test?

-- 
Bye, Peter Korsgaard

[Buildroot] Problem using net-snmp and Buildroot

[Peter Korsgaard]

>>>>> "Luca" == Luca Altobelli <LUCA.ALTOBELLI@dimacosystems.com> writes:

Hi,

 Luca> I tried 2009.11-rc1 and net-snmp 5.5 with same results. It only
 Luca> works with old versions (net-snmp 5.1.2 works).

Odd, it works here:

mkdir /tmp/blah
sudo mount -o loop,rw /tmp/br/images/rootfs.i686.ext2 /tmp/blah
sudo chroot /tmp/blah /bin/sh

/ # snmpd -v

NET-SNMP version:  5.5
Web:               http://www.net-snmp.org/
Email:             net-snmp-coders at lists.sourceforge.net

/ #  

Do you have any libsnmp (development-) packages installed on your host?
On my system there's:

dpkg -l \*snmp\*|grep ii
ii  libsnmp-base   5.4.1~dfsg-12  SNMP (Simple Network Management Protocol) MI
ii  libsnmp15      5.4.1~dfsg-12  SNMP (Simple Network Management Protocol) li

So no -dev packages. I'll retry with your exact config in a moment.

-- 
Bye, Peter Korsgaard

[Buildroot] Problem using net-snmp and Buildroot

[Peter Korsgaard]

>>>>> "Luca" == Luca Altobelli <LUCA.ALTOBELLI@dimacosystems.com> writes:

Hi,

 Luca> Dear Peter,
 Luca> following your istructions:
 Luca> dpkg -l \*snmp\*|grep ii
 Luca> ii  libsnmp-base                               5.4.1~dfsg-12ubuntu3
 Luca> SNMP (Simple Network Management Protocol) MI
 Luca> ii  libsnmp15                                   5.4.1~dfsg-12ubuntu3
 Luca> SNMP (Simple Network Management Protocol) li

 Luca> mounting the rootfs.i486.ext2 (used 2009.11-rc1 and net-snmp 5.5):
 Luca> # snmpd -v
 Luca> snmpd: can't load library 'libcrypto.so.0.9.8'
 Luca> that I found in the host-lib directory , while in the  target-lib  I
 Luca> have libcrypt-0.9.30.1.so.

You should also have a libcrypto on the target. E.G. with the config you
posted I have:

file /tmp/br/target/usr/lib/libcrypto.so.0.9.8                      ~
/tmp/br/target/usr/lib/libcrypto.so.0.9.8: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped

If not, it sounds like something goes wrong with the openssl compilation
and something gets confused about host/target.

I haven't been able to reproduce it with your config, but I'm on a
x86-64 host, so that might be why - Sorry, I don't have any 32bit
PCs any more.

sudo mount -o loop,rw /tmp/br/images/rootfs.i486.ext2 /tmp/blah 
sudo chroot /tmp/blah /bin/sh
/ # snmpd -v

NET-SNMP version:  5.5
Web:               http://www.net-snmp.org/
Email:             net-snmp-coders at lists.sourceforge.net

 Luca> I also asked in the uclibc mailing list and Carmelo Amoroso
 Luca> replied: "[..]it seems that you are not using uClibc, instead you
 Luca> are linking against glibc".

Indeed.

-- 
Bye, Peter Korsgaard

[Buildroot] Problem using net-snmp and Buildroot

[Michael S. Zick]

On Thu November 26 2009, Peter Korsgaard wrote:
> >>>>> "Luca" == Luca Altobelli <LUCA.ALTOBELLI@dimacosystems.com> writes:
> 
> Hi,
> 
>  Luca> Dear Peter,
>  Luca> following your istructions:
>  Luca> dpkg -l \*snmp\*|grep ii
>  Luca> ii  libsnmp-base                               5.4.1~dfsg-12ubuntu3
>  Luca> SNMP (Simple Network Management Protocol) MI
>  Luca> ii  libsnmp15                                   5.4.1~dfsg-12ubuntu3
>  Luca> SNMP (Simple Network Management Protocol) li
> 
>  Luca> mounting the rootfs.i486.ext2 (used 2009.11-rc1 and net-snmp 5.5):
>  Luca> # snmpd -v
>  Luca> snmpd: can't load library 'libcrypto.so.0.9.8'
>  Luca> that I found in the host-lib directory , while in the  target-lib  I
>  Luca> have libcrypt-0.9.30.1.so.
> 
> You should also have a libcrypto on the target. E.G. with the config you
> posted I have:
> 
> file /tmp/br/target/usr/lib/libcrypto.so.0.9.8                      ~
> /tmp/br/target/usr/lib/libcrypto.so.0.9.8: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
> 
> If not, it sounds like something goes wrong with the openssl compilation
> and something gets confused about host/target.
> 
> I haven't been able to reproduce it with your config, but I'm on a
> x86-64 host, so that might be why - Sorry, I don't have any 32bit
> PCs any more.
> 

Sure you do, it is hidden inside of your x86_64 box.  ;)

Install the Linux-Vserver patch, set the option to emulate 32bit 
in your kernel config, build and boot kernel, install your choice
of 32bit distributions in an ARCH=x86 guest context.

I currently run Gentoo-32bit, Debian-32bit, Ubuntu-32bit on my
x86-64 box (all at the same time). It is a Core2Quad box.
Ah, yes, I also run the same threesum in 64bit also at the same time.

Bottom of the page: http://linux-vserver.org/Welcome_to_Linux-VServer.org
That project's idea of "Experimental" puts other project's idea of "Stable"
to shame.  ;)

Mike
> sudo mount -o loop,rw /tmp/br/images/rootfs.i486.ext2 /tmp/blah 
> sudo chroot /tmp/blah /bin/sh
> / # snmpd -v
> 
> NET-SNMP version:  5.5
> Web:               http://www.net-snmp.org/
> Email:             net-snmp-coders at lists.sourceforge.net
> 
>  Luca> I also asked in the uclibc mailing list and Carmelo Amoroso
>  Luca> replied: "[..]it seems that you are not using uClibc, instead you
>  Luca> are linking against glibc".
> 
> Indeed.
> 

[Buildroot] Problem using net-snmp and Buildroot

[Peter Korsgaard]

>>>>> "Michael" == Michael S Zick <minimod@morethan.org> writes:

Hi,

 >> If not, it sounds like something goes wrong with the openssl
 >> compilation and something gets confused about host/target.
 >> 
 >> I haven't been able to reproduce it with your config, but I'm on a
 >> x86-64 host, so that might be why - Sorry, I don't have any 32bit
 >> PCs any more.

 Michael> Sure you do, it is hidden inside of your x86_64 box.  ;)

 Michael> Install the Linux-Vserver patch, set the option to emulate 32bit 
 Michael> in your kernel config, build and boot kernel, install your choice
 Michael> of 32bit distributions in an ARCH=x86 guest context.

 Michael> I currently run Gentoo-32bit, Debian-32bit, Ubuntu-32bit on my
 Michael> x86-64 box (all at the same time). It is a Core2Quad box.
 Michael> Ah, yes, I also run the same threesum in 64bit also at the same time.

Sure, or just powering up a kvm instance. I'm not saying it cannot be
done, it will just take me longer than the spare time I have today to
do a 32bit install with the dependencies and do a rebuild.

-- 
Bye, Peter Korsgaard

[Buildroot] Problem using net-snmp and Buildroot

[Peter Korsgaard]

>>>>> "Michael" == Michael S Zick <minimod@morethan.org> writes:

Hi,

 Michael> Oh, I missed that translation of your post, I thought you said:
 Michael> "do not have the equipment"
 Michael> not that you said:
 Michael> "do not have the time"

 Michael> I guess I will have to start using google translate for this list. ;)

;)

Could you give Luca's .config a try on your 32bit setup and see if you
can reproduce the problem?

http://lists.busybox.net/pipermail/buildroot/attachments/20091124/3fb95d96/attachment.diff

(change the uclibc + busybox configs to their default values, E.G. 
BR2_UCLIBC_CONFIG="toolchain/uClibc/uClibc-0.9.30.config"
BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-1.13.x.config")

Thanks.

-- 
Bye, Peter Korsgaard