Test TLS interoperability between LibreSSL and OpenSSL.

Implement simple SSL client and server in C.  Create four binaries
by linking them with LibreSSL or OpenSSL.  This way API compatibility
is tested.  Connect and accept with netcat to test protocol
compatibility with libtls.

Currently OpenSSL 1.0.2p from ports is used.  Plan is to move to
OpenSSL 1.1 and and test TLS 1.3.

idea from beck@; help from jsing@

1 files changed, 27 insertions, 0 deletions

diff --git a/src/regress/lib/libssl/interop/openssl/Makefile b/src/regress/lib/libssl/interop/openssl/Makefile
new file mode 100644
index 0000000000..26095d0019
--- /dev/null
+++ b/src/regress/lib/libssl/interop/openssl/Makefile
@@ -0,0 +1,27 @@
+# $OpenBSD: Makefile,v 1.1.1.1 2018/11/07 01:08:49 bluhm Exp $
+
+.if ! exists(/usr/local/bin/eopenssl)
+regress:
+        # install openssl-1.0.2p from ports for interop tests
+        @echo SKIPPED
+.endif
+
+PROGS =                 client server
+CPPFLAGS =              -I /usr/local/include/eopenssl
+LDFLAGS =               -L /usr/local/lib/eopenssl
+LDADD =                 -lssl -lcrypto
+DPADD =                 /usr/local/lib/eopenssl/libssl.a \
+                        /usr/local/lib/eopenssl/libcrypto.a
+LD_LIBRARY_PATH =       /usr/local/lib/eopenssl
+
+.for p in ${PROGS}
+run-ldd-$p: ldd-$p.out
+        @echo '\n======== $@ ========'
+        # check that $p is linked with OpenSSL
+        grep -q /usr/local/lib/eopenssl/libcrypto.so ldd-$p.out
+        grep -q /usr/local/lib/eopenssl/libssl.so ldd-$p.out
+        # check that $p is not linked with LibreSSL
+        ! grep -v libc.so ldd-$p.out | grep /usr/lib/
+.endfor
+
+.include <bsd.regress.mk>