qdevices/qdevice-heuristics-worker-log.c

   1 /*
   2  * Copyright (c) 2015-2017 Red Hat, Inc.
   3  *
   4  * All rights reserved.
   5  *
   6  * Author: Jan Friesse (jfriesse@redhat.com)
   7  *
   8  * This software licensed under BSD license, the text of which follows:
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * - Redistributions of source code must retain the above copyright notice,
  14  *   this list of conditions and the following disclaimer.
  15  * - Redistributions in binary form must reproduce the above copyright notice,
  16  *   this list of conditions and the following disclaimer in the documentation
  17  *   and/or other materials provided with the distribution.
  18  * - Neither the name of the Red Hat, Inc. nor the names of its
  19  *   contributors may be used to endorse or promote products derived from this
  20  *   software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <stdarg.h>
  36 #include <stdlib.h>
  37 #include <syslog.h>
  38
  39 #include "dynar.h"
  40 #include "dynar-str.h"
  41 #include "qdevice-heuristics-io.h"
  42 #include "qdevice-heuristics-worker.h"
  43 #include "qdevice-heuristics-worker-log.h"
  44
  45 static int
  46 qdevice_heuristics_worker_log_remove_newlines(struct dynar *str)
  47 {
  48         size_t len;
  49         size_t zi;
  50         char *buf;
  51
  52         len = dynar_size(str);
  53         buf = dynar_data(str);
  54
  55         for (zi = 0; zi < len ; zi++) {
  56                 if (buf[zi] == '\n' || buf[zi] == '\r') {
  57                         buf[zi] = ' ';
  58                 }
  59         }
  60
  61         return (0);
  62 }
  63
  64 void
  65 qdevice_heuristics_worker_log_printf(struct qdevice_heuristics_worker_instance *instance,
  66     int priority, const char *format, ...)
  67 {
  68         va_list ap;
  69         va_list ap_copy;
  70
  71         va_start(ap, format);
  72
  73         if (dynar_str_cpy(&instance->log_out_buffer, "") != -1 &&
  74             dynar_str_catf(&instance->log_out_buffer, "%u ", priority) != -1 &&
  75             dynar_str_vcatf(&instance->log_out_buffer, format, ap) != -1 &&
  76             qdevice_heuristics_worker_log_remove_newlines(&instance->log_out_buffer) != -1 &&
  77             dynar_str_cat(&instance->log_out_buffer, "\n") != -1) {
  78                 /*
  79                  * It was possible to log everything
  80                  */
  81                 (void)qdevice_heuristics_io_blocking_write(QDEVICE_HEURISTICS_WORKER_LOG_OUT_FD,
  82                     dynar_data(&instance->log_out_buffer), dynar_size(&instance->log_out_buffer));
  83         } else {
  84                 /*
  85                  * As a fallback try to log to syslog
  86                  */
  87                 va_copy(ap_copy, ap);
  88                 openlog("qdevice_heuristics_worker", LOG_PID, LOG_DAEMON);
  89                 syslog(LOG_ERR, "Log entry sent to syslog instead of parent process");
  90                 vsyslog(priority, format, ap_copy);
  91                 closelog();
  92                 va_end(ap_copy);
  93         }
  94
  95         va_end(ap);
  96 }