make is failing with an error "invalid application of ‘sizeof’ to incomplete type ‘EVP_MD_CTX’"

[bhuvanplus]

I have followed the procedure explained in the file README.maintainer. All the steps till "make" have succeeded. The " make " command throws the following error "invalid application of ‘sizeof’ to incomplete type ‘EVP_MD_CTX’ {aka ‘struct evp_md_ctx_st’}". Please help me in resolving this issue.

/usr/local/bin/erlc -W -v -I ../../snmp-collector/include -I ../include ../../snmp-collector/src/snmp_collector_manager_fsm.erl
/usr/local/bin/erlc -W -v -I ../../snmp-collector/include -I ../include ../../snmp-collector/src/snmp_collector_manager_fsm_sup.erl
/usr/local/bin/erlc -W -v -I ../../snmp-collector/include -I ../include ../../snmp-collector/src/snmp_collector_manager_server.erl
/usr/local/bin/erlc -W -v -I ../../snmp-collector/include -I ../include ../../snmp-collector/src/snmp_collector_manager_sup_sup.erl
/usr/local/bin/erlc -W -v -I ../../snmp-collector/include -I ../include ../../snmp-collector/src/snmp_collector_manager_port_sup.erl
/usr/local/bin/erlc -W -v -I ../../snmp-collector/include -I ../include ../../snmp-collector/src/snmp_collector_manager_sup.erl
make[2]: Leaving directory '/home/bhuvan/git/snmp_collector.build/ebin'

Making all in c_src
make[2]: Entering directory '/home/bhuvan/git/snmp_collector.build/c_src'
/bin/bash ../libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I../../snmp-collector/c_src -I..   -I/include -I/usr/local/lib/erlang/erts-14.1.1/include  -g -O2 -Wall -MT snmp_collector_usm.lo -MD -MP -MF .deps/snmp_collector_usm.Tpo -c -o snmp_collector_usm.lo ../../snmp-collector/c_src/snmp_collector_usm.c

libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../../snmp-collector/c_src -I.. -I/include -I/usr/local/lib/erlang/erts-14.1.1/include -g -O2 -Wall -MT snmp_collector_usm.lo -MD -MP -MF .deps/snmp_collector_usm.Tpo -c ../../snmp-collector/c_src/snmp_collector_usm.c  -fPIC -DPIC -o .libs/snmp_collector_usm.o

../../snmp-collector/c_src/snmp_collector_usm.c: In function ‘ku_nif’:
../../snmp-collector/c_src/snmp_collector_usm.c:165:32: **error: invalid application of ‘sizeof’ to incomplete type ‘EVP_MD_CTX’ {aka ‘struct evp_md_ctx_st’}**
  165 |                         sizeof(EVP_MD_CTX))) == NULL))
      |                                ^~~~~~~~~~

make[2]: *** [Makefile:462: snmp_collector_usm.lo] Error 1
make[2]: Leaving directory '/home/bhuvan/git/snmp_collector.build/c_src'
make[1]: *** [Makefile:435: all-recursive] Error 1
make[1]: Leaving directory '/home/bhuvan/git/snmp_collector.build'
make: *** [Makefile:365: all] Error 2
bhuvan@vm-alarm:~/git/snmp_collector.build$ 

[vances]

This is an issue with OpenSSL, I would guess that you are using a newer version than this code supports.

[bhuvanplus]

Thanks for a quick response.

I am using Ubuntu 22.04.2 LTS & openssl 3.0.2-0ubuntu1.15 which is around 2 yrs old.

I see snmp-collector/c_src/snmp_collector_usm.c has compiler check for the older openssl version "OpenSSL < v1.1.0". From this, I this understood that snmp-collector supports the latest version such as 3.x as well.

Do you think that openssl 3.0.2 is the reason for the error "error: invalid application of ‘sizeof’ to incomplete type ‘EVP_MD_CTX’"?

[vances]

Totally. The check is for portability between openssl 1.1.0 and older versions. Version 1.1.0 was current at that time. I'm sure it's not difficult to support openssl 3.0.2, however I don't have the time right at the moment.