freebsd-skq/contrib/blacklist/bin/support.c
Kurt Lidl 12017ca883 Import NetBSD's blacklist source from vendor tree
This import includes The basic blacklist library and utility programs,
to add a system-wide packet filtering notification mechanism to
FreeBSD.

The rational behind the daemon was given by Christos Zoulas in a
presentation at vBSDcon 2015: https://youtu.be/fuuf8G28mjs

Reviewed by:	rpaulo
Approved by:	rpaulo
Obtained from:	NetBSD
Relnotes:	YES
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D5912
2016-06-01 22:04:10 +00:00

158 lines
3.6 KiB
C

/* $NetBSD: support.c,v 1.8 2016/04/04 15:52:56 christos Exp $ */
/*-
* Copyright (c) 2015 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/cdefs.h>
__RCSID("$NetBSD: support.c,v 1.8 2016/04/04 15:52:56 christos Exp $");
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <stdlib.h>
#include <inttypes.h>
#include "support.h"
static __attribute__((__format_arg__(3))) const char *
expandm(char *buf, size_t len, const char *fmt)
{
char *p;
size_t r;
if ((p = strstr(fmt, "%m")) == NULL)
return fmt;
r = (size_t)(p - fmt);
if (r >= len)
return fmt;
strlcpy(buf, fmt, r + 1);
strlcat(buf, strerror(errno), len);
strlcat(buf, fmt + r + 2, len);
return buf;
}
void
vdlog(int level __unused, const char *fmt, va_list ap)
{
char buf[BUFSIZ];
// fprintf(stderr, "%s: ", getprogname());
vfprintf(stderr, expandm(buf, sizeof(buf), fmt), ap);
fprintf(stderr, "\n");
}
void
dlog(int level, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vdlog(level, fmt, ap);
va_end(ap);
}
const char *
fmttime(char *b, size_t l, time_t t)
{
struct tm tm;
if (localtime_r(&t, &tm) == NULL)
snprintf(b, l, "*%jd*", (intmax_t)t);
else
strftime(b, l, "%Y/%m/%d %H:%M:%S", &tm);
return b;
}
const char *
fmtydhms(char *b, size_t l, time_t t)
{
time_t s, m, h, d, y;
int z;
size_t o;
s = t % 60;
t /= 60;
m = t % 60;
t /= 60;
h = t % 60;
t /= 24;
d = t % 24;
t /= 356;
y = t;
z = 0;
o = 0;
#define APPEND(a) \
if (a) { \
z = snprintf(b + o, l - o, "%jd%s", (intmax_t)a, __STRING(a)); \
if (z == -1) \
return b; \
o += (size_t)z; \
if (o >= l) \
return b; \
}
APPEND(y)
APPEND(d)
APPEND(h)
APPEND(m)
APPEND(s)
return b;
}
ssize_t
blhexdump(char *buf, size_t len, const char *str, const void *b, size_t l)
{
size_t z, cz;
int r;
const unsigned char *p = b;
const unsigned char *e = p + l;
r = snprintf(buf, len, "%s: ", str);
if (r == -1)
return -1;
if ((cz = z = (size_t)r) >= len)
cz = len;
while (p < e) {
r = snprintf(buf + cz, len - cz, "%.2x", *p++);
if (r == -1)
return -1;
if ((cz = (z += (size_t)r)) >= len)
cz = len;
}
return (ssize_t)z;
}