1 /* $NetBSD: tcpdrop.c,v 1.3 2007/06/28 18:47:17 christos Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Herb Hasler and Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /* $OpenBSD: tcpdrop.c,v 1.5 2006/01/03 01:46:27 stevesk Exp $ */
36
37 /*
38 * Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
39 *
40 * Permission to use, copy, modify, and distribute this software for any
41 * purpose with or without fee is hereby granted, provided that the above
42 * copyright notice and this permission notice appear in all copies.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
45 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
46 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
47 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
48 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
49 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
50 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
51 */
52
53 #include <sys/param.h>
54 #include <sys/socket.h>
55 #include <sys/sysctl.h>
56
57 #include <netinet/in.h>
58 #include <netinet/tcp.h>
59 #include <netinet/ip_var.h>
60 #include <netinet/tcp_timer.h>
61 #include <netinet/tcp_var.h>
62
63 #include <assert.h>
64 #include <err.h>
65 #include <stdio.h>
66 #include <string.h>
67 #include <stdlib.h>
68 #include <netdb.h>
69
70 struct hpinfo {
71 char host[NI_MAXHOST];
72 char serv[NI_MAXSERV];
73 };
74
75 static struct addrinfo *
egetaddrinfo(const char * host,const char * serv)76 egetaddrinfo(const char *host, const char *serv)
77 {
78 static const struct addrinfo hints = {
79 .ai_family = AF_UNSPEC,
80 .ai_socktype = SOCK_STREAM,
81 };
82 struct addrinfo *ai;
83 int gaierr;
84
85 if ((gaierr = getaddrinfo(host, serv, &hints, &ai)) != 0)
86 errx(1, "%s port %s: %s", host, serv, gai_strerror(gaierr));
87 return ai;
88 }
89
90 static void
egetnameinfo(const struct addrinfo * ai,struct hpinfo * hp)91 egetnameinfo(const struct addrinfo *ai, struct hpinfo *hp)
92 {
93 int gaierr;
94
95 if ((gaierr = getnameinfo(ai->ai_addr, ai->ai_addrlen,
96 hp->host, sizeof(hp->host), hp->serv, sizeof(hp->serv),
97 NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
98 errx(1, "getnameinfo: %s", gai_strerror(gaierr));
99 }
100
101 /*
102 * Drop a tcp connection.
103 */
104 int
main(int argc,char ** argv)105 main(int argc, char **argv)
106 {
107 int mib[] = { CTL_NET, 0, IPPROTO_TCP, TCPCTL_DROP };
108 struct addrinfo *ail, *aif, *laddr, *faddr;
109 struct sockaddr_storage sa[2];
110 struct hpinfo fhp, lhp;
111 int rval = 0;
112
113 setprogname(argv[0]);
114
115 if (argc != 5) {
116 (void)fprintf(stderr, "Usage: %s laddr lport faddr fport\n",
117 getprogname());
118 return 1;
119 }
120
121 laddr = egetaddrinfo(argv[1], argv[2]);
122 faddr = egetaddrinfo(argv[3], argv[4]);
123
124 for (ail = laddr; ail; ail = ail->ai_next) {
125 for (aif = faddr; aif; aif = aif->ai_next) {
126
127 if (ail->ai_family != aif->ai_family)
128 continue;
129
130 egetnameinfo(ail, &lhp);
131 egetnameinfo(aif, &fhp);
132
133 (void)memset(sa, 0, sizeof(sa));
134
135 assert(aif->ai_addrlen <= sizeof(*sa));
136 assert(ail->ai_addrlen <= sizeof(*sa));
137
138 (void)memcpy(&sa[0], aif->ai_addr, aif->ai_addrlen);
139 (void)memcpy(&sa[1], ail->ai_addr, ail->ai_addrlen);
140
141 switch (ail->ai_family) {
142 case AF_INET:
143 mib[1] = PF_INET;
144 break;
145 case AF_INET6:
146 mib[1] = PF_INET6;
147 break;
148 default:
149 warnx("Unsupported socket address family %d",
150 ail->ai_family);
151 continue;
152 }
153
154 if (sysctl(mib, sizeof(mib) / sizeof(int), NULL,
155 NULL, sa, sizeof(sa)) == -1) {
156 rval = 1;
157 warn("%s:%s, %s:%s",
158 lhp.host, lhp.serv, fhp.host, fhp.serv);
159 } else
160 (void)printf("%s:%s %s:%s dropped\n",
161 lhp.host, lhp.serv, fhp.host, fhp.serv);
162
163 }
164 }
165 freeaddrinfo(laddr);
166 freeaddrinfo(faddr);
167 return rval;
168 }
169