Dave,
Try adding --with-openssl=/usr in the call to configure on your raspberry pi.
If you're brave you can also try 5.8pre3 from
https://sourceforge.net/projects/net-snmp/files/net-snmp/5.8-pre-releases/
--
Thanks,
Keith (pantherse)
On Wed, May 2, 2018, at 7:04 PM, Dave C wrote:
> I'm trying to build net-snmp-5.7.3 on a raspbery pi running Raspbian 9.4
> stretch.
>
> The default packages are OpenSSL 1.1.0f 25 May 2017, libssl-dev
> 1.1.0f-3+deb9u2.
>
> I configure net-snmp like so,
>
> ./configure --with-defaults --with-ldflags=-Bstatic --disable-embedded-perl
> --disable-perl-cc-checks --without-perl-modules
>
> And get this config output..
>
> > ---------------------------------------------------------
> > Net-SNMP configuration summary:
> > ---------------------------------------------------------
> > SNMP Versions Supported: 1 2c 3
> > Building for: linux
> > Net-SNMP Version: 5.7.3
> > Network transport support: Callback Unix Alias TCP UDP IPv4Base
> > SocketBase TCPBase UDPIPv4Base UDPBase
> > SNMPv3 Security Modules: usm
> > Agent MIB code: default_modules => snmpv3mibs mibII ucd_snmp
> > notification notification-log-mib target agent_mibs agentx disman/event
> > disman/schedule utilities host
> > MYSQL Trap Logging: unavailable
> > Embedded Perl support: disabled
> > SNMP Perl modules: disabled
> > SNMP Python modules: disabled
> > Crypto support from: crypto ///// internal ??
> > Authentication support: MD5 SHA1
> > Encryption support: DES AES
> > Local DNSSEC validation: disabled
>
>
> However make dies at this point.
>
> /bin/bash ../libtool --mode=compile gcc -I../include -I.
> > -I../snmplib -fno-strict-aliasing -g -O2 -Ulinux -Dlinux=linux -c -o
> > keytools.lo keytools.c
> > libtool: compile: gcc -I../include -I. -I../snmplib -fno-strict-aliasing
> > -g -O2 -Ulinux -Dlinux=linux -c keytools.c -fPIC -DPIC -o .libs/keytools.o
> > keytools.c: In function 'generate_Ku':
> > keytools.c:155:25: error: dereferencing pointer to incomplete type
> > 'EVP_MD_CTX {aka struct evp_md_ctx_st}'
> > ctx = malloc(sizeof(*ctx));
> > ^~~~
> > keytools.c:265:9: warning: implicit declaration of function
> > 'EVP_MD_CTX_cleanup' [-Wimplicit-function-declaration]
> > EVP_MD_CTX_cleanup(ctx);
> > ^~~~~~~~~~~~~~~~~~
> > Makefile:98: recipe for target 'keytools.lo' failed
> > make[1]: *** [keytools.lo] Error 1
> > make[1]: Leaving directory '/root/net-snmp-5.7.3/snmplib'
> > Makefile:656: recipe for target 'subdirs' failed
> > make: *** [subdirs] Error 1
>
>
> So the first question is what's wrong with the above ?
>
>
> I have an Ubuntu box where I build net-snmp fine with crypo, it runs
> OpenSSL 1.0.2g so I downgraded the Raspbery PI to 1.0.2o
>
> apt-get remove openssl
> > apt-get remove libssl-dev
> > cd ~
> > wget https://www.openssl.org/source/openssl-1.0.2o.tar.gz
> > cd openssl...
> > ./config --prefix=/usr/local --openssldir=/usr/local/openssl shared
> > make
> > make install
> > ldconfig
> > ldd $(which openssl)
> > linux-vdso.so.1 (0x7ee91000)
> > /usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f09000)
> > libssl.so.1.0.0 => /usr/local/lib/libssl.so.1.0.0 (0x76ea4000)
> > libcrypto.so.1.0.0 => /usr/local/lib/libcrypto.so.1.0.0
> > (0x76d17000)
> > libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x76d04000)
> > libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x76bc5000)
> > /lib/ld-linux-armhf.so.3 (0x76f1f000)
> >
>
> Everything seems fine but now the configuration summary shows only "Crypto
> support from: Internal"
>
> I looked at the configure script to see how it tests for OpenSSL support
> and replicated that
>
> #include <openssl/ssl.h>
> > char EVP_md5 ();
> > int main(int argc, char *argv[]) {
> > return EVP_md5 ();
> > ;
> > return 0;
> > }
>
>
> When I build that I get the following error showing that the EVP_md5 is
> accessible and the crypto library is installed.
>
> # gcc t.c -lcrypto
> > t.c:3:6: error: conflicting types for ‘EVP_md5’
> > char EVP_md5 ();
> > ^~~~~~~
> > In file included from /usr/local/include/openssl/x509.h:73:0,
> > from /usr/local/include/openssl/ssl.h:156,
> > from t.c:1:
> > /usr/local/include/openssl/evp.h:716:15: note: previous declaration of
> > ‘EVP_md5’ was here
> > const EVP_MD *EVP_md5(void);
> > ^~~~~~~
>
>
>
> I'm not sure if that's the exact test that the configure script is doing
> but it's just not detecting
>
> I hacked the configure script to force CRYPTO="crypto" but then compilation
> fails elsewhere so I assume I actually have installed OpenSSL incorrectly.
>
> But ether-way I would prefer to fix the first problem above and link
> to libssl-dev
> 1.1.0f
>
> Thanks
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