Uses deprecated OpenSSL 3.0 API

[mbiebl]

Version: 8.2404.0

Building rsyslog on a recent Debian sid, I get

tcpflood.c: In function 'initTLS':
tcpflood.c:1301:9: warning: 'ERR_load_BIO_strings' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
 1301 |         ERR_load_BIO_strings();
      |         ^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/openssl/cryptoerr.h:17,
                 from /usr/include/openssl/crypto.h:38,
                 from /usr/include/openssl/comp.h:22,
                 from /usr/include/openssl/ssl.h:29,
                 from tcpflood.c:128:
/usr/include/openssl/cryptoerr_legacy.h:31:27: note: declared here
   31 | OSSL_DEPRECATEDIN_3_0 int ERR_load_BIO_strings(void);
      |                           ^~~~~~~~~~~~~~~~~~~~
tcpflood.c: In function 'initTLSSess':
tcpflood.c:1462:17: warning: 'BIO_set_callback' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
 1462 |                 BIO_set_callback(bio_client, BIO_debug_callback);
      |                 ^~~~~~~~~~~~~~~~
In file included from /usr/include/openssl/ssl.h:30:
/usr/include/openssl/bio.h:307:28: note: declared here
  307 | OSSL_DEPRECATEDIN_3_0 void BIO_set_callback(BIO *b, BIO_callback_fn callback);
      |                            ^~~~~~~~~~~~~~~~
tcpflood.c:1462:17: warning: 'BIO_debug_callback' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
 1462 |                 BIO_set_callback(bio_client, BIO_debug_callback);
      |                 ^~~~~~~~~~~~~~~~
/usr/include/openssl/bio.h:308:28: note: declared here
  308 | OSSL_DEPRECATEDIN_3_0 long BIO_debug_callback(BIO *bio, int cmd,
      |                            ^~~~~~~~~~~~~~~~~~
tcpflood.c: In function 'initDTLSSess':
tcpflood.c:1569:17: warning: 'BIO_set_callback' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
 1569 |                 BIO_set_callback(bio_client, BIO_debug_callback);
      |                 ^~~~~~~~~~~~~~~~
/usr/include/openssl/bio.h:307:28: note: declared here
  307 | OSSL_DEPRECATEDIN_3_0 void BIO_set_callback(BIO *b, BIO_callback_fn callback);
      |                            ^~~~~~~~~~~~~~~~
tcpflood.c:1569:17: warning: 'BIO_debug_callback' is deprecated: Since OpenSSL 3.0 [-Wdeprecated-declarations]
 1569 |                 BIO_set_callback(bio_client, BIO_debug_callback);
      |                 ^~~~~~~~~~~~~~~~
/usr/include/openssl/bio.h:308:28: note: declared here
  308 | OSSL_DEPRECATEDIN_3_0 long BIO_debug_callback(BIO *bio, int cmd,
      |                            ^~~~~~~~~~~~~~~~~~

[alorbach]

This only affects the testbench utility "tcpflood.c", not the actual rsyslog build because it handles the different versions for those Debug Callbacks. I will keep this in mind and update the code in tcpflood.c.