[glib-networking/mcatanzaro/#13] Improve handshake error messages as far as possible

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9c0f773202a7afca741ab1af0aa06ea501331887
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Jun 23 10:46:00 2019 -0500

    Improve handshake error messages as far as possible
    
    Let's add a bit more detail to these very generic error messages.
    
    Fixes #13

 tls/gnutls/gtlsconnection-gnutls.c   | 23 +++++++++++++++--------
 tls/openssl/gtlsconnection-openssl.c |  4 ++--
 2 files changed, 17 insertions(+), 10 deletions(-)
---
diff --git a/tls/gnutls/gtlsconnection-gnutls.c b/tls/gnutls/gtlsconnection-gnutls.c
index 62caa53..947695f 100644
--- a/tls/gnutls/gtlsconnection-gnutls.c
+++ b/tls/gnutls/gtlsconnection-gnutls.c
@@ -347,14 +347,21 @@ end_gnutls_io (GTlsConnectionGnutls  *gnutls,
   if (handshaking && !ever_handshaked)
     {
       if (g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_FAILED) ||
-          g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_BROKEN_PIPE) ||
-          status == GNUTLS_E_UNEXPECTED_PACKET_LENGTH ||
+          g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_BROKEN_PIPE))
+        {
+          g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
+                       _("Peer failed to perform TLS handshake: %s"), my_error->message);
+          g_clear_error (&my_error);
+          return G_TLS_CONNECTION_BASE_ERROR;
+        }
+
+      if (status == GNUTLS_E_UNEXPECTED_PACKET_LENGTH ||
           status == GNUTLS_E_DECRYPTION_FAILED ||
           status == GNUTLS_E_UNSUPPORTED_VERSION_PACKET)
         {
           g_clear_error (&my_error);
-          g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
-                               _("Peer failed to perform TLS handshake"));
+          g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
+                       _("Peer failed to perform TLS handshake: %s"), gnutls_strerror (status));
           return G_TLS_CONNECTION_BASE_ERROR;
         }
     }
@@ -377,8 +384,8 @@ end_gnutls_io (GTlsConnectionGnutls  *gnutls,
       if (handshaking && !ever_handshaked)
         {
           g_clear_error (&my_error);
-          g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
-                               _("Peer failed to perform TLS handshake"));
+          g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
+                       _("Peer failed to perform TLS handshake: %s"), gnutls_strerror (status));
           return G_TLS_CONNECTION_BASE_ERROR;
         }
 
@@ -408,8 +415,8 @@ end_gnutls_io (GTlsConnectionGnutls  *gnutls,
   if (ret == GNUTLS_E_CERTIFICATE_ERROR)
     {
       g_clear_error (&my_error);
-      g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
-                   _("Unacceptable TLS certificate"));
+      g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
+                           _("Unacceptable TLS certificate"));
       return G_TLS_CONNECTION_BASE_ERROR;
     }
 
diff --git a/tls/openssl/gtlsconnection-openssl.c b/tls/openssl/gtlsconnection-openssl.c
index 96dcd16..58c08eb 100644
--- a/tls/openssl/gtlsconnection-openssl.c
+++ b/tls/openssl/gtlsconnection-openssl.c
@@ -135,8 +135,8 @@ end_openssl_io (GTlsConnectionOpenssl  *openssl,
           reason == SSL_R_UNKNOWN_PROTOCOL)
         {
           g_clear_error (&my_error);
-          g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
-                               _("Peer failed to perform TLS handshake"));
+          g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
+                       _("Peer failed to perform TLS handshake: %s"), ERR_reason_error_string (err));
           return G_TLS_CONNECTION_BASE_ERROR;
         }
     }