ocserv/src/log.c

/*
 * Copyright (C) 2013 Nikos Mavrogiannopoulos
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <config.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>

#include <vpn.h>

const char *human_addr(const struct sockaddr *sa, socklen_t salen,
		       void *_buf, size_t buflen)
{
	const char *save_buf = _buf;
	char *buf = _buf;
	size_t l;

	if (!buf || !buflen)
		return NULL;

	*buf = '[';
	buf++;
	buflen--;

	if (getnameinfo(sa, salen, buf, buflen, NULL, 0, NI_NUMERICHOST) !=
	    0)
		return NULL;

	l = strlen(buf);
	buf += l;
	buflen -= l;

	*buf = ']';
	buf++;
	buflen--;

	*buf = ':';
	buf++;
	buflen--;

	if (getnameinfo(sa, salen, NULL, 0, buf, buflen, NI_NUMERICSERV) !=
	    0)
		return NULL;

	return save_buf;
}

void __attribute__ ((format(printf, 3, 4)))
    oclog(const worker_st * ws, int priority, const char *fmt, ...)
{
	char buf[1024];
	char ipbuf[128];
	const char* ip;
	va_list args;

	ip = human_addr((void*)&ws->remote_addr, ws->remote_addr_len,
			    ipbuf, sizeof(ipbuf));

	buf[1023] = 0;

	va_start(args, fmt);
	vsnprintf(buf, 1023, fmt, args);
	va_end(args);

	if (ip)
		syslog(priority, "%s %s", ip, buf);
	else
		syslog(priority, "[unknown] %s", buf);
	
	return;
}