[gnutls-help] More specific output when an error occurs

[Pascal Withopf]

Hi everyone,

when using GnuTLS in Rsyslog and the key file is empty then the following
error occurs from function gnutls_certificate_set_x509_key_file().

2017-09-07T16:07:43.981768+02:00 localhost rsyslogd[28575]: unexpected
GnuTLS error -302 in nsd_gtls.c:577: Error in parsing.  [v8.30.0.master try
http://www.rsyslog.com/e/2078 ]
2017-09-07T16:07:43.982798+02:00 localhost rsyslogd[28575]: error adding
our certificate. GnuTLS error -302, message: 'Error in parsing.', key:
'/home/usr/proj/certs/machine-key.pem', cert:
'/home/usr/proj/certs/machine-cert.pem' [v8.30.0.master try
http://www.rsyslog.com/e/2078 ]

Only after using the functions gnutls_global_set_log_function() and
gnutls_global_set_log_level() you can find more detailed output.

8676.147805605:main thread    : nsd_gtls.c: GnuTLS log msg, level 9: Could
not find '-----BEGIN RSA PRIVATE KEY'
8676.147809763:main thread    : nsd_gtls.c: GnuTLS log msg, level 9: Could
not find '-----BEGIN DSA PRIVATE KEY'
8676.147813879:main thread    : nsd_gtls.c: GnuTLS log msg, level 9: Could
not find '-----BEGIN EC PRIVATE KEY'

My question: Is there a way to get a more detailed output like this without
having to look at the whole debug output.

My goal is to give more specific information when the error occurs, so
Rsyslog users will know what is wrong without having to dig deeper
themselfs.

Best Regards
Pascal
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