Re: [net-snmp/net-snmp] Compile from Source of 5.9 Results in Missing Libraries? (#289)

One more note about this... this morning I had an itch I could not 
scratch, about why the entire issue resulted.  So, I completely 
uninstalled net-snmp-5.9 via make uninstall, deleted the source 
directory, then I installed the existing official net-snmp package for 
Debian 10 buster (which is 5.7.1 if memory serves), I validated snmp was 
working as expected.  I then uninstalled the official package via apt 
remove --purge.  Copied down a clean copy of net-snmp 5.9 and proceeded 
following my notes, running configure, make, and make install.  I 
confirmed that /usr/local/sbin is the default path, I confirmed that 
/usr/local/sbin, was in libc.conf under /etc/ld.so.conf.d/, and then ran 
ldd.  This time ldd did not report any missing libraries?  That strikes 
me as odd!  So I guess the next step is a completely clean Debian 10 
buster OS install, and see if I can get any consistency for the issue or 
not.  Clearly this issue occurs because there is enough communication 
about it via Google search. And clearly I did trip over it yesterday.  
But it is a bit of mystery at this point how or why.

-DD

On 5/14/2021 09:39, Dachshund Digital wrote:
>
> Actually I figured this out... not completely sure why it happens on 
> my system, and I found a few references to it happening for others via 
> google as well... so it is not a one off issue per se.
>
> One odd quirk is that my install of net-snmp defaults on Debian 10 
> /usr/local/sbin, not /usr/sbin/, I ran ./configure with no added 
> options for not sure why this delta emerges.   But this is only an 
> issue for the unit file (systemd) default file that needs to be 
> tweaked for the different path.  It is this difference in path that 
> resulted that is at the heart of the issue.  But I digress, to fix the 
> 'not found' (they do exist, just not found) libraries issue there are 
> two options to that I have found that work.
>
> Option 1:
>
>     Edit the hidden bashrc file for the user that will run snmpd, add 
> the the following line...
>
>         export LD_LIBRARY_PATH=/usr/local/lib
>
>     Logout and login to invoke bashrc execution.
>
> Option 2, which I like better is to do the following...
>
>    Check for or Create /etc/ld.so.conf.d/libc.conf.   Some systems I 
> reviewed had libc.conf with the needed path, some did not.  One google 
> reference created a local.conf file with the same path as well.
>
>         # nano /etc/ld.so.conf.d/libc.conf
>
>             /usr/local/lib
>
>     Then run ldconfig
>
> After the above changes...
>
> # ldd /usr/local/sbin/snmpd
>         linux-gate.so.1 (0xb7fa8000)
>         libnetsnmpagent.so.40 => /usr/local/lib/libnetsnmpagent.so.40 
> (0xb7f1c000)
>         libnetsnmpmibs.so.40 => /usr/local/lib/libnetsnmpmibs.so.40 
> (0xb7cc7000)
>         libnetsnmp.so.40 => /usr/local/lib/libnetsnmp.so.40 (0xb7be5000)
>         libperl.so.5.28 => /usr/lib/i386-linux-gnu/libperl.so.5.28 
> (0xb787d000)
>         libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xb7877000)
>         libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 
> (0xb7856000)
>         libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb7678000)
>         libcrypt.so.1 => /lib/i386-linux-gnu/libcrypt.so.1 (0xb7645000)
>         libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xb753f000)
>         /lib/ld-linux.so.2 (0xb7faa000)
>
> The libraries that were not found are now found!  This should let 
> snmpd fine the libraries as expected, via direct run or via systemd 
> unit file for same.  Providing you update the unit file for the path 
> delta as noted above.Just for reference, the tweaked unit file is 
> below...  For my test, I did not create a specific user, used root.  
> This is not a best practice, the current Debian 10 package (based on 
> 5.7.1) uses 'Debian-snmp' as execution user, you should consider doing 
> this if moving to 5.9 when compiled from source.
>
> # cat /lib/systemd/system/snmpd.service
> [Unit]
> Description=Simple Network Management Protocol (SNMP) daemon.
> After=syslog.target network.target
>
> [Service]
> Type=simple
> ExecStartPre=/bin/mkdir -p /var/run/agentx
> #ExecStart=/usr/local/sbin/snmpd -LS6d -Lf /dev/null -u Debian-snmp -g 
> Debian-snmp -I -smux,mteTrigger,mteTriggerConf -f -p /run/snmpd.pid
> ExecStart=/usr/local/sbin/snmpd -LS6d -Lf /dev/null -I 
> -smux,mteTrigger,mteTriggerConf -f -p /run/snmpd.pid
> ExecReload=/bin/kill -HUP $MAINPID
>
> [Install]
> WantedBy=multi-user.target
>
> -DD
>
> On 5/13/2021 20:25, Bart Van Assche wrote:
>
>> I can't reproduce this. If I build and install Net-SNMP from the v5.9 
>> branch, the installed binary runs fine:
>>
>> |./configure --enable-developer --enable-ipv6 
>> --prefix=/home/bart/net-snmp-V5-9-patches --with-cflags=-g -O1 -pipe 
>> -DNETSNMP_USE_ASSERT -D_FORTIFY_SOURCE=2 -fno-strict-aliasing 
>> -fno-inline -fno-inline-functions -fno-inline-functions- called-once 
>> -fno-early-inlining -Wno-inline -fno-inline-small-functions -DNETSN 
>> MP_USE_ASSERT --with-defaults --enable-new-features 
>> --with-perl-modules --with- default-snmp-version=2 
>> --with-transports=IPX STD DTLSUDP TLSTCP --with-security -modules=usm 
>> tsm --with-mib-modules=agent/extend examples/data_set examples/del 
>> ayed_instance examples/example examples/notification 
>> examples/scalar_int exampl es/ucdDemoPublic examples/watched smux 
>> disman/event disman/expression disman/mt eEventNotificationTable 
>> disman/mteEventTable disman/mteObjectsTable disman/mteT 
>> riggerBooleanTable disman/mteTriggerDeltaTable 
>> disman/mteTriggerExistenceTable disman/mteTriggerTable 
>> disman/mteTriggerThresholdTable disman/nslookup-mib dism an/ping-mib 
>> disman/schedule disman/traceroute-mib examples/netSnmpHostsTable ha 
>> rdware/cpu hardware/memory host ip-forward-mib 
>> ip-mib/inetNetToMediaTable ip-mi b/ipv4InterfaceTable 
>> ip-mib/ipv6InterfaceTable mibII/mta_sendmail misc/ipfwacc 
>> snmp-notification-mib tcp-mib testhandler tunnel ucd-snmp/diskio 
>> ucd-snmp/exten sible udp-mib Rmon Rmon/alarm snmp-usm-dh-objects-mib 
>> tlstm-mib tsm-mib --with- ldflags=-L/usr/local/lib CFLAGS=-g -O1 
>> -pipe -DNETSNMP_USE_ASSERT -D_FORTIFY_SO URCE=2 -fno-strict-aliasing 
>> -fno-inline -fno-inline-functions -fno-inline-func tions-called-once 
>> -fno-early-inlining -Wno-inline -fno-inline-small-functions C 
>> PPFLAGS=-g -O1 -pipe -DNETSNMP_USE_ASSERT -D_FORTIFY_SOURCE=2 
>> -fno-strict-aliasing -fno-inline -fno-inline-functions 
>> -fno-inline-functions-called-once -fno-early-inlining -Wno-inline 
>> -fno-inline-small-functions LDFLAGS= && make && make install |
>>
>> From the installation directory (/home/bart/net-snmp-V5-9-patches):
>>
>> |$ ldd sbin/snmpd linux-vdso.so.1 (0x00007ffd7f3d8000) 
>> libnetsnmpagent.so.40 => 
>> /home/bart/net-snmp-V5-9-patches/lib/libnetsnmpagent.so.40 
>> (0x00007fd958ca7000) libnetsnmpmibs.so.40 => 
>> /home/bart/net-snmp-V5-9-patches/lib/libnetsnmpmibs.so.40 
>> (0x00007fd95899d000) libnetsnmp.so.40 => 
>> /home/bart/net-snmp-V5-9-patches/lib/libnetsnmp.so.40 
>> (0x00007fd9588c0000) libpthread.so.0 => 
>> /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd958897000) libc.so.6 
>> => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd9586d2000) 
>> libperl.so.5.32 => /lib/x86_64-linux-gnu/libperl.so.5.32 
>> (0x00007fd958344000) libcrypto.so.1.1 => 
>> /lib/x86_64-linux-gnu/libcrypto.so.1.1 (0x00007fd95804e000) 
>> libpci.so.3 => /lib/x86_64-linux-gnu/libpci.so.3 (0x00007fd95803d000) 
>> libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd958037000) 
>> libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd957ef3000) 
>> libssl.so.1.1 => /lib/x86_64-linux-gnu/libssl.so.1.1 
>> (0x00007fd957e60000) /lib64/ld-linux-x86-64.so.2 (0x00007fd958d27000) 
>> libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 
>> (0x00007fd957e25000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 
>> (0x00007fd957e06000) libresolv.so.2 => 
>> /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007fd957dec000) 
>> libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 
>> (0x00007fd957dc4000) $ ./sbin/snmpd -f -Lo -c 
>> ~/software/tools/snmpd.conf -r :1161 [ snmpd runs fine ] |
>>
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