/* $NetBSD: tcpdrop.c,v 1.3 2007/06/28 18:47:17 christos Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Herb Hasler and Rick Macklem at The University of Guelph.
*
* 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. 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.
*/
/* $OpenBSD: tcpdrop.c,v 1.5 2006/01/03 01:46:27 stevesk Exp $ */
/*
* Copyright (c) 2004 Markus Friedl <
[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/ip_var.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
struct hpinfo {
char host[NI_MAXHOST];
char serv[NI_MAXSERV];
};
static struct addrinfo *
egetaddrinfo(const char *host, const char *serv)
{
static const struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
};
struct addrinfo *ai;
int gaierr;
if ((gaierr = getaddrinfo(host, serv, &hints, &ai)) != 0)
errx(1, "%s port %s: %s", host, serv, gai_strerror(gaierr));
return ai;
}
static void
egetnameinfo(const struct addrinfo *ai, struct hpinfo *hp)
{
int gaierr;
if ((gaierr = getnameinfo(ai->ai_addr, ai->ai_addrlen,
hp->host, sizeof(hp->host), hp->serv, sizeof(hp->serv),
NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
errx(1, "getnameinfo: %s", gai_strerror(gaierr));
}
/*
* Drop a tcp connection.
*/
int
main(int argc, char **argv)
{
int mib[] = { CTL_NET, 0, IPPROTO_TCP, TCPCTL_DROP };
struct addrinfo *ail, *aif, *laddr, *faddr;
struct sockaddr_storage sa[2];
struct hpinfo fhp, lhp;
int rval = 0;
setprogname(argv[0]);
if (argc != 5) {
(void)fprintf(stderr, "Usage: %s laddr lport faddr fport\n",
getprogname());
return 1;
}
laddr = egetaddrinfo(argv[1], argv[2]);
faddr = egetaddrinfo(argv[3], argv[4]);
for (ail = laddr; ail; ail = ail->ai_next) {
for (aif = faddr; aif; aif = aif->ai_next) {
if (ail->ai_family != aif->ai_family)
continue;
egetnameinfo(ail, &lhp);
egetnameinfo(aif, &fhp);
(void)memset(sa, 0, sizeof(sa));
assert(aif->ai_addrlen <= sizeof(*sa));
assert(ail->ai_addrlen <= sizeof(*sa));
(void)memcpy(&sa[0], aif->ai_addr, aif->ai_addrlen);
(void)memcpy(&sa[1], ail->ai_addr, ail->ai_addrlen);
switch (ail->ai_family) {
case AF_INET:
mib[1] = PF_INET;
break;
case AF_INET6:
mib[1] = PF_INET6;
break;
default:
warnx("Unsupported socket address family %d",
ail->ai_family);
continue;
}
if (sysctl(mib, sizeof(mib) / sizeof(int), NULL,
NULL, sa, sizeof(sa)) == -1) {
rval = 1;
warn("%s:%s, %s:%s",
lhp.host, lhp.serv, fhp.host, fhp.serv);
} else
(void)printf("%s:%s %s:%s dropped\n",
lhp.host, lhp.serv, fhp.host, fhp.serv);
}
}
freeaddrinfo(laddr);
freeaddrinfo(faddr);
return rval;
}
