diff options
| -rw-r--r-- | usr.sbin/tcpdrop/Makefile | 7 | ||||
| -rw-r--r-- | usr.sbin/tcpdrop/tcpdrop.c | 84 |
2 files changed, 91 insertions, 0 deletions
diff --git a/usr.sbin/tcpdrop/Makefile b/usr.sbin/tcpdrop/Makefile new file mode 100644 index 00000000000..425e7e89d5f --- /dev/null +++ b/usr.sbin/tcpdrop/Makefile @@ -0,0 +1,7 @@ +# $OpenBSD: Makefile,v 1.1 2004/04/26 19:51:20 markus Exp $ + +PROG= tcpdrop +MAN= tcpdrop.8 +CFLAGS+= -Wall + +.include <bsd.prog.mk> diff --git a/usr.sbin/tcpdrop/tcpdrop.c b/usr.sbin/tcpdrop/tcpdrop.c new file mode 100644 index 00000000000..5cd62842ba1 --- /dev/null +++ b/usr.sbin/tcpdrop/tcpdrop.c @@ -0,0 +1,84 @@ +/* $OpenBSD: tcpdrop.c,v 1.1 2004/04/26 19:51:20 markus Exp $ */ + +/* + * Copyright (c) 2004 Markus Friedl <markus@openbsd.org> + * + * 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 <stdio.h> +#include <string.h> +#include <netdb.h> +#include <err.h> + +extern char *__progname; + +/* + * Drop a tcp connection. + */ +int +main(int argc, char **argv) +{ + struct addrinfo hints, *ail, *aif, *laddr, *faddr; + struct tcp_ident_mapping tir, dummy; + int mib[] = { CTL_NET, PF_INET, IPPROTO_TCP, TCPCTL_DROP }; + int gaierr; + size_t i = 1; + + if (argc != 5) { + fprintf(stderr, "usage: %s laddr lport faddr fport\n", + __progname); + exit(1); + } + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + + if ((gaierr = getaddrinfo(argv[1], argv[2], &hints, &laddr)) != 0) + errx(1, "%s port %s: %s", argv[1], argv[2], + gai_strerror(gaierr)); + + if ((gaierr = getaddrinfo(argv[3], argv[4], &hints, &faddr)) != 0) { + freeaddrinfo(laddr); + errx(1, "%s port %s: %s", argv[3], argv[4], + gai_strerror(gaierr)); + } + + for (ail = laddr; ail; ail = ail->ai_next) { + for (aif = faddr; aif; aif = aif->ai_next) { + if (ail->ai_family != aif->ai_family) + continue; + memcpy(&tir.faddr, aif->ai_addr, aif->ai_addrlen); + memcpy(&tir.laddr, ail->ai_addr, ail->ai_addrlen); + i = sizeof (tir); + if (sysctl(mib, sizeof (mib) / sizeof (int), &dummy, + &i, &tir, i) == -1) + warn(NULL); + } + } + freeaddrinfo(laddr); + freeaddrinfo(faddr); + + exit(0); +} |