err.c

一个网络工具包,可以嗅探email和http等数据包中的密码等信息.注意要先把libnet-1.0.2a.tar.gz和 libnids-1.16.tar.gz装上,不然会因为缺少库函数而无法编译和安

/*
 * err.c
 *
 * Adapted from OpenBSD libc *err* *warn* code.
 *
 * Copyright (c) 2000 Dug Song <[e-mail]>
 *
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>

void
err(int eval, const char *fmt, ...)
{
	va_list ap;
	
	va_start(ap, fmt);
	if (fmt != NULL) {
		(void)vfprintf(stderr, fmt, ap);
		(void)fprintf(stderr, ": ");
	}
	va_end(ap);
	(void)fprintf(stderr, "%s\n", strerror(errno));
	exit(eval);
}

void
warn(const char *fmt, ...)
{
	va_list ap;
	
	va_start(ap, fmt);
	if (fmt != NULL) {
		(void)vfprintf(stderr, fmt, ap);
		(void)fprintf(stderr, ": ");
	}
	va_end(ap);
	(void)fprintf(stderr, "%s\n", strerror(errno));
}

void
errx(int eval, const char *fmt, ...)
{
	va_list ap;
	
	va_start(ap, fmt);
	if (fmt != NULL)
		(void)vfprintf(stderr, fmt, ap);
	(void)fprintf(stderr, "\n");
	va_end(ap);
	exit(eval);
}

void
warnx(const char *fmt, ...)
{
	va_list ap;
	
	va_start(ap, fmt);
	if (fmt != NULL)
		(void)vfprintf(stderr, fmt, ap);
        (void)fprintf(stderr, "\n");
	va_end(ap);
}