/***************************************************************************
 * nsock_log.c -- nsock logging infrastructure.                            *
 *                                                                         *
 ***********************IMPORTANT NSOCK LICENSE TERMS***********************
 *                                                                         *
 * The nsock parallel socket event library is (C) 1999-2017 Insecure.Com   *
 * LLC This library is free software; you may redistribute and/or          *
 * modify it under the terms of the GNU General Public License as          *
 * published by the Free Software Foundation; Version 2.  This guarantees  *
 * your right to use, modify, and redistribute this software under certain *
 * conditions.  If this license is unacceptable to you, Insecure.Com LLC   *
 * may be willing to sell alternative licenses (contact                    *
 * sales@insecure.com ).                                                   *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included docs/licenses/OpenSSL.txt file, and distribute   *
 * linked combinations including the two. You must obey the GNU GPL in all *
 * respects for all of the code used other than OpenSSL.  If you modify    *
 * this file, you may extend this exception to your version of the file,   *
 * but you are not obligated to do so.                                     *
 *                                                                         *
 * If you received these files with a written license agreement stating    *
 * terms other than the (GPL) terms above, then that alternative license   *
 * agreement takes precedence over this comment.                           *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
 * This also allows you to audit the software for security holes.          *
 *                                                                         *
 * Source code also allows you to port Nmap to new platforms, fix bugs,    *
 * and add new features.  You are highly encouraged to send your changes   *
 * to the dev@nmap.org mailing list for possible incorporation into the    *
 * main distribution.  By sending these changes to Fyodor or one of the    *
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 *                                                                         *
 * This program is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of              *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
 * General Public License v2.0 for more details                            *
 * (http://www.gnu.org/licenses/gpl-2.0.html).                             *
 *                                                                         *
 ***************************************************************************/

/* $Id: nsock_log.c 36788 2017-06-07 12:32:38Z dmiller $ */


#define _GNU_SOURCE
#include <stdio.h>

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>

#include "nsock_internal.h"
#include "nsock_log.h"

static void nsock_stderr_logger(const struct nsock_log_rec *rec);

extern struct timeval nsock_tod;

nsock_loglevel_t    NsockLogLevel = NSOCK_LOG_ERROR;
nsock_logger_t      NsockLogger   = nsock_stderr_logger;


void nsock_set_log_function(nsock_logger_t logger) {
  if (logger != NULL)
      NsockLogger = logger;
  else
      NsockLogger = nsock_stderr_logger;

  nsock_log_debug("Registered external logging function: %p", NsockLogger);
}

nsock_loglevel_t nsock_get_loglevel(void) {
  return NsockLogLevel;
}

void nsock_set_loglevel(nsock_loglevel_t loglevel) {
  NsockLogLevel = loglevel;
  nsock_log_debug("Set log level to %s", nsock_loglevel2str(loglevel));
}

void nsock_stderr_logger(const struct nsock_log_rec *rec) {
  fprintf(stderr, "libnsock %s(): %s\n", rec->func, rec->msg);
}

void __nsock_log_internal(nsock_loglevel_t loglevel, const char *file, int line,
                          const char *func, const char *format, ...) {
  struct nsock_log_rec rec;
  va_list args;
  int rc;

  va_start(args, format);

  rec.level = loglevel;
  rec.time = nsock_tod;
  rec.file = file;
  rec.line = line;
  rec.func = func;

  rc = vasprintf(&rec.msg, format, args);
  if (rc >= 0) {
    NsockLogger(&rec);
    free(rec.msg);
  }
  va_end(args);
}

