3196f9f0d0
It is expected under normal circumstances that the connection may be abruptly closed, including during the handshake. For example, this will commonly occur when a TCP load balancer is performing a simple service health check. An message noting that the connection has been closed during the Guacamole protocol handshake is really only of benefit when debugging, where that information may provide useful context. If not debugging, the message amounts to log noise.
150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "log.h"
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#include <guacamole/client.h>
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#include <guacamole/error.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <unistd.h>
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int guacd_log_level = GUAC_LOG_INFO;
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void vguacd_log(guac_client_log_level level, const char* format,
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va_list args) {
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const char* priority_name;
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int priority;
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char message[2048];
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/* Don't bother if the log level is too high */
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if (level > guacd_log_level)
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return;
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/* Copy log message into buffer */
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vsnprintf(message, sizeof(message), format, args);
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/* Convert log level to syslog priority */
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switch (level) {
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/* Error log level */
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case GUAC_LOG_ERROR:
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priority = LOG_ERR;
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priority_name = "ERROR";
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break;
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/* Warning log level */
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case GUAC_LOG_WARNING:
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priority = LOG_WARNING;
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priority_name = "WARNING";
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break;
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/* Informational log level */
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case GUAC_LOG_INFO:
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priority = LOG_INFO;
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priority_name = "INFO";
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break;
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/* Debug log level */
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case GUAC_LOG_DEBUG:
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priority = LOG_DEBUG;
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priority_name = "DEBUG";
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break;
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/* Trace log level */
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case GUAC_LOG_TRACE:
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priority = LOG_DEBUG;
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priority_name = "TRACE";
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break;
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/* Any unknown/undefined log level */
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default:
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priority = LOG_INFO;
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priority_name = "UNKNOWN";
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break;
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}
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/* Log to syslog */
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syslog(priority, "%s", message);
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/* Log to STDERR */
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fprintf(stderr, GUACD_LOG_NAME "[%i]: %s:\t%s\n",
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getpid(), priority_name, message);
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}
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void guacd_log(guac_client_log_level level, const char* format, ...) {
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va_list args;
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va_start(args, format);
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vguacd_log(level, format, args);
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va_end(args);
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}
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void guacd_client_log(guac_client* client, guac_client_log_level level,
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const char* format, va_list args) {
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vguacd_log(level, format, args);
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}
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void guacd_log_guac_error(guac_client_log_level level, const char* message) {
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if (guac_error != GUAC_STATUS_SUCCESS) {
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/* If error message provided, include in log */
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if (guac_error_message != NULL)
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guacd_log(level, "%s: %s",
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message,
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guac_error_message);
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/* Otherwise just log with standard status string */
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else
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guacd_log(level, "%s: %s",
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message,
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guac_status_string(guac_error));
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}
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/* Just log message if no status code */
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else
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guacd_log(level, "%s", message);
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}
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void guacd_log_handshake_failure() {
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if (guac_error == GUAC_STATUS_CLOSED)
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guacd_log(GUAC_LOG_DEBUG,
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"Guacamole connection closed during handshake");
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else if (guac_error == GUAC_STATUS_PROTOCOL_ERROR)
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guacd_log(GUAC_LOG_ERROR,
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"Guacamole protocol violation. Perhaps the version of "
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"guacamole-client is incompatible with this version of "
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"guacd?");
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else
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guacd_log(GUAC_LOG_WARNING,
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"Guacamole handshake failed: %s",
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guac_status_string(guac_error));
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}
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