89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
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/* $OpenBSD: tcpdrop.c,v 1.4 2004/05/22 23:55:22 deraadt Exp $ */
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/*-
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* Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <netinet/in.h>
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#include <netinet/tcp_var.h>
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#include <err.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* Drop a tcp connection.
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*/
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int
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main(int argc, char *argv[])
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{
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struct addrinfo hints, *ail, *aif, *laddr, *faddr;
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struct tcp_ident_mapping tir;
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int mib[] = { CTL_NET, PF_INET, IPPROTO_TCP, TCPCTL_DROP };
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int gaierr, rval = 0;
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char fhbuf[NI_MAXHOST], fsbuf[NI_MAXSERV], lhbuf[NI_MAXHOST],
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lsbuf[NI_MAXSERV];
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if (argc != 5)
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errx(1, "usage: tcpdrop laddr lport faddr fport\n");
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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if ((gaierr = getaddrinfo(argv[1], argv[2], &hints, &laddr)) != 0)
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errx(1, "%s port %s: %s", argv[1], argv[2],
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gai_strerror(gaierr));
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if ((gaierr = getaddrinfo(argv[3], argv[4], &hints, &faddr)) != 0) {
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freeaddrinfo(laddr);
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errx(1, "%s port %s: %s", argv[3], argv[4],
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gai_strerror(gaierr));
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}
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for (ail = laddr; ail; ail = ail->ai_next) {
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for (aif = faddr; aif; aif = aif->ai_next) {
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if (ail->ai_family != aif->ai_family)
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continue;
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memcpy(&tir.faddr, aif->ai_addr, aif->ai_addrlen);
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memcpy(&tir.laddr, ail->ai_addr, ail->ai_addrlen);
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if (getnameinfo(aif->ai_addr, aif->ai_addrlen,
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fhbuf, sizeof(fhbuf),
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fsbuf, sizeof(fsbuf),
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NI_NUMERICHOST | NI_NUMERICSERV) == -1)
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err(1, "getnameinfo");
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if (getnameinfo(ail->ai_addr, ail->ai_addrlen,
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lhbuf, sizeof(lhbuf),
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lsbuf, sizeof(lsbuf),
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NI_NUMERICHOST | NI_NUMERICSERV) == -1)
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err(1, "getnameinfo");
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if (sysctl(mib, sizeof (mib) / sizeof (int), NULL,
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NULL, &tir, sizeof(tir)) == -1) {
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rval = 1;
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warn("%s %s %s %s", lhbuf, lsbuf, fhbuf, fsbuf);
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} else
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printf("%s %s %s %s: dropped\n",
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lhbuf, lsbuf, fhbuf, fsbuf);
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}
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}
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freeaddrinfo(laddr);
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freeaddrinfo(faddr);
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exit(rval);
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}
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