/***************************************************************************
 * nsock_log.c -- nsock logging infrastructure.                            *
 *                                                                         *
 ***********************IMPORTANT NSOCK LICENSE TERMS***********************
 *
 * The nsock parallel socket event library is (C) 1999-2023 Nmap Software 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, Nmap Software LLC may be willing to sell alternative
 * licenses (contact sales@nmap.com ).
 *
 * As a special exception to the GPL terms, Nmap Software 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 Insecure.Org
 * development mailing lists, or checking them into the Nmap source code
 * repository, it is understood (unless you specify otherwise) that you are
 * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
 * right to reuse, modify, and relicense the code. Nmap will always be available
 * Open Source, but this is important because the inability to relicense code
 * has caused devastating problems for other Free Software projects (such as KDE
 * and NASM). We also occasionally relicense the code to third parties as
 * discussed above. If you wish to specify special license conditions of your
 * contributions, just say so when you send them.
 *
 * 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).
 *
 ***************************************************************************/

/* $Id$ */


#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);
}