Re: EPICS SNMP compile error

[Majer Karel via Tech-talk <tech-talk at aps.anl.gov>]

Hi all,

I had exactly the same issue while building on RockyLinux 9 with net-snmp 5.9.1.

The issue is that usmDESPrivProtocol is declared in net-snmp library with #ifndef NETSNMP_DISABLE_DES directive. Net-snmp header on Rocky 9 defines NETSNMP_DISABLE_DES.

It can be fixed by using the same directive on lines 3299 - 3300 of devSnmp.cpp. The replacement for lines 3299-3300 (suggested by AI) is:

#ifndef NETSNMP_DISABLE_DES

      v3params.securityPrivProto    = snmp_duplicate_objid(usmDESPrivProtocol,USM_PRIV_PROTO_DES_LEN);

      v3params.securityPrivProtoLen = USM_PRIV_PROTO_DES_LEN;

#else

      printf("devSnmp ERROR: SNMPv3 privProtocol 'DES' is not supported by this net-snmp build, use AES instead\n");

#endif

I also tried to modify the header to not define NETSNMP_DISABLE_DES, but the build failed during linking. It seems that libnetsnmp.so would have to be rebuilt as well.

Best regards,

Karel

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Peter Sx via Tech-talk <tech-talk at aps.anl.gov>
Sent: Thursday, March 12, 2026 11:07 PM
To: Hu, Yong <yhu at bnl.gov>; Priller, John <priller at frib.msu.edu>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; Michael Davidsaver <mdavidsaver at gmail.com>
Subject: Re: EPICS SNMP compile error

 

Hi Yong， John and Michael.

I uninstalled the net-snmp 5.9.1 and installed 5.9.4 Pre. Then I compiled the epics snmp module. It went through.  Thank you all for helping!

Best

Susheng

On Thu, Mar 12, 2026 at 1:39 PM Hu, Yong <yhu at bnl.gov> wrote:

OR I can stop by your office tomorrow if that is more convenient to you.

From: Peter Sx <xinss0017 at gmail.com>
Date: Thursday, March 12, 2026 at 9:08 AM

 

Thank you, Yong! Let me try  using the other version today. I will see you tomorrow.

On Thu, Mar 12, 2026, 8:29 AM Hu, Yong <yhu at bnl.gov> wrote:

I am out of office today. I will be in tomorrow. You can stop by tomorrow so we can try 5.9.1.

From: Peter Sx <xinss0017 at gmail.com>
Date: Wednesday, March 11, 2026 at 5:47 PM

 

Hi John, Yong and Michael,

I had a busy day in the field. Sorry for the late reply!

My version is 5.9.1. I will try to install an older version and compile it again. Thank you all for helping!

Best

Susheng

On Wed, Mar 11, 2026 at 12:19 PM Priller, John <priller at frib.msu.edu> wrote:

Susheng;

What version of libsnmp do you have installed?

This is what version I'm compiling against, shown with the net-snmp-config command, on this Linux version I got from uname:

$> net-snmp-config --version

5.9.4.pre2

$> uname -v

 uname -v

#1 SMP PREEMPT_DYNAMIC Debian 6.12.27-1 (2025-05-06)

I tried compiling on a host with a slightly older version of debian, which also compiles okay:

>$ net-snmp-config --version

5.7.3

>$ uname -v

#1 SMP Debian 4.19.316-1 (2024-06-25)

- JP

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From: Peter Sx <xinss0017 at gmail.com>
Sent: Wednesday, March 11, 2026 11:05 AM
To: tech-talk at aps.anl.gov; Priller, John
Subject: EPICS SNMP compile error

 

[EXTERNAL] This email originated from outside of FRIB

Dear John and EPICS specialist, 

I have the following errors while compiling the SNMP 1.1.0.5.  Could you please help me out? My EPICS version is V7.0.9. Thank you!

Susheng

/usr/bin/g++  -D_GNU_SOURCE -D_DEFAULT_SOURCE        -DdevSnmp_NETSNMP_VERSION=50901  -D_X86_64_ -DUNIX  -Dlinux      -O3 -g   -Wall    -DUSE_TYPED_RSET  -mtune=generic     -m64  -fPIC -I. -I../O.Common -I. -I. -I.. -I../../../include/compiler/gcc -I../../../include/os/Linux -I../../../include -I/usr/local/epics/base//include/compiler/gcc -I/usr/local/epics/base//include/os/Linux -I/usr/local/epics/base//include        -c ../devSnmp.cpp
../devSnmp.cpp: In member function ‘void devSnmp_host::setSnmpV3Param(const char*, const char*, bool)’:
../devSnmp.cpp:3299:60: error: ‘usmDESPrivProtocol’ was not declared in this scope; did you mean ‘usmAESPrivProtocol’?
 3299 |       v3params.securityPrivProto    = snmp_duplicate_objid(usmDESPrivProtocol,USM_PRIV_PROTO_DES_LEN);
      |                                                            ^~~~~~~~~~~~~~~~~~
      |                                                            usmAESPrivProtocol
make[3]: *** [/usr/local/epics/base//configure/RULES_BUILD:268: devSnmp.o] Error 1
make[3]: Leaving directory '/home/sxin/Downloads/epics-snmp-1.1.0.5/snmpApp/src/O.linux-x86_64'
make[2]: *** [/usr/local/epics/base//configure/RULES_ARCHS:58: install.linux-x86_64] Error 2
make[2]: Leaving directory '/home/sxin/Downloads/epics-snmp-1.1.0.5/snmpApp/src'
make[1]: *** [/usr/local/epics/base//configure/RULES_DIRS:85: src.install] Error 2
make[1]: Leaving directory '/home/sxin/Downloads/epics-snmp-1.1.0.5/snmpApp'
make: *** [/usr/local/epics/base//configure/RULES_DIRS:85: snmpApp.install] Error 2