openssl: skip trace outputs for ssl_ver == 0

The OpenSSL trace callback is wonderfully undocumented but given a
journey in the source code, it seems the cases were ssl_ver is zero
doesn't follow the same pattern and thus turned out confusing and
misleading. For now, we skip doing any CURLINFO_TEXT logging on those
but keep sending them as CURLINFO_SSL_DATA_OUT/IN.

Also, I added direction to the text info and I edited some functions
slightly.

Bug: #219
Reported-by: Jay Satiro, Ashish Shukla

lib/vtls/openssl.c

@@ -1487,8 +1487,10 @@ static const char *ssl_msg_type(int ssl_ver, int msg)
         return "Client hello";
       case SSL3_MT_SERVER_HELLO:
         return "Server hello";
+      case SSL3_MT_NEWSESSION_TICKET:
+        return "Newsession Ticket";
       case SSL3_MT_CERTIFICATE:
-        return "CERT";
+        return "Certificate";
       case SSL3_MT_SERVER_KEY_EXCHANGE:
         return "Server key exchange";
       case SSL3_MT_CLIENT_KEY_EXCHANGE:
@@ -1501,19 +1503,31 @@ static const char *ssl_msg_type(int ssl_ver, int msg)
         return "CERT verify";
       case SSL3_MT_FINISHED:
         return "Finished";
+#ifdef SSL3_MT_CERTIFICATE_STATUS
+      case SSL3_MT_CERTIFICATE_STATUS:
+        return "Certificate Status";
+#endif
     }
   }
   return "Unknown";
 }
 
 static const char *tls_rt_type(int type)
 {
-  return (
-    type == SSL3_RT_CHANGE_CIPHER_SPEC ? "TLS change cipher, " :
-    type == SSL3_RT_ALERT              ? "TLS alert, "         :
-    type == SSL3_RT_HANDSHAKE          ? "TLS handshake, "     :
-    type == SSL3_RT_APPLICATION_DATA   ? "TLS app data, "      :
-                                         "TLS Unknown, ");
+  switch(type) {
+  case SSL3_RT_HEADER:
+    return "TLS header";
+  case SSL3_RT_CHANGE_CIPHER_SPEC:
+    return "TLS change cipher";
+  case SSL3_RT_ALERT:
+    return "TLS alert";
+  case SSL3_RT_HANDSHAKE:
+    return "TLS handshake";
+  case SSL3_RT_APPLICATION_DATA:
+    return "TLS app data";
+  default:
+    return "TLS Unknown";
+  }
 }
 
 
@@ -1538,8 +1552,8 @@ static void ssl_tls_trace(int direction, int ssl_ver, int content_type,
   data = conn->data;
 
   switch(ssl_ver) {
-#ifdef SSL2_VERSION_MAJOR /* removed in recent versions */
-  case SSL2_VERSION_MAJOR:
+#ifdef SSL2_VERSION /* removed in recent versions */
+  case SSL2_VERSION:
     verstr = "SSLv2";
     break;
 #endif
@@ -1561,29 +1575,36 @@ static void ssl_tls_trace(int direction, int ssl_ver, int content_type,
     verstr = "TLSv1.2";
     break;
 #endif
+  case 0:
+    break;
   default:
     snprintf(unknown, sizeof(unknown), "(%x)", ssl_ver);
     verstr = unknown;
     break;
   }
 
-  ssl_ver >>= 8; /* check the upper 8 bits only below */
+  if(ssl_ver) {
+    /* the info given when the version is zero is not that useful for us */
 
-  /* SSLv2 doesn't seem to have TLS record-type headers, so OpenSSL
-   * always pass-up content-type as 0. But the interesting message-type
-   * is at 'buf[0]'.
-   */
-  if(ssl_ver == SSL3_VERSION_MAJOR && content_type != 0)
-    tls_rt_name = tls_rt_type(content_type);
-  else
-    tls_rt_name = "";
+    ssl_ver >>= 8; /* check the upper 8 bits only below */
 
-  msg_type = *(char*)buf;
-  msg_name = ssl_msg_type(ssl_ver, msg_type);
+    /* SSLv2 doesn't seem to have TLS record-type headers, so OpenSSL
+     * always pass-up content-type as 0. But the interesting message-type
+     * is at 'buf[0]'.
+     */
+    if(ssl_ver == SSL3_VERSION_MAJOR && content_type)
+      tls_rt_name = tls_rt_type(content_type);
+    else
+      tls_rt_name = "";
 
-  txt_len = snprintf(ssl_buf, sizeof(ssl_buf), "%s, %s%s (%d):\n",
-                     verstr, tls_rt_name, msg_name, msg_type);
-  Curl_debug(data, CURLINFO_TEXT, ssl_buf, (size_t)txt_len, NULL);
+    msg_type = *(char*)buf;
+    msg_name = ssl_msg_type(ssl_ver, msg_type);
+
+    txt_len = snprintf(ssl_buf, sizeof(ssl_buf), "%s (%s), %s, %s (%d):\n",
+                       verstr, direction?"OUT":"IN",
+                       tls_rt_name, msg_name, msg_type);
+    Curl_debug(data, CURLINFO_TEXT, ssl_buf, (size_t)txt_len, NULL);
+  }
 
   Curl_debug(data, (direction == 1) ? CURLINFO_SSL_DATA_OUT :
              CURLINFO_SSL_DATA_IN, (char *)buf, len, NULL);