1/*-
2 * Copyright (c) 2006 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29/*
30 * TCP regression test which opens a loopback TCP session, and closes it
31 * before the remote endpoint (server) can accept it.  Run the test twice,
32 * once using an explicit close() from the client, a second using a tcp drop.
33 */
34
35#include <sys/types.h>
36#include <sys/socket.h>
37#include <sys/sysctl.h>
38
39#include <netinet/in.h>
40
41#include <err.h>
42#include <errno.h>
43#include <signal.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#define	TCP_PORT	9005
50
51static int
52tcp_drop(struct sockaddr_in *sin_local, struct sockaddr_in *sin_remote)
53{
54	struct sockaddr_storage addrs[2];
55
56	/*
57	 * Sysctl accepts an array of two sockaddr's, the first being the
58	 * 'foreign' sockaddr, the second being the 'local' sockaddr.
59	 */
60
61	bcopy(sin_remote, &addrs[0], sizeof(*sin_remote));
62	bcopy(sin_local, &addrs[1], sizeof(*sin_local));
63
64	return (sysctlbyname("net.inet.tcp.drop", NULL, 0, addrs,
65	    sizeof(addrs)));
66}
67
68
69static void
70tcp_server(pid_t partner)
71{
72	int error, listen_fd, accept_fd;
73	struct sockaddr_in sin;
74
75	listen_fd = socket(PF_INET, SOCK_STREAM, 0);
76	if (listen_fd < 0) {
77		error = errno;
78		(void)kill(partner, SIGKILL);
79		errno = error;
80		err(-1, "tcp_server: socket");
81	}
82
83	bzero(&sin, sizeof(sin));
84	sin.sin_family = AF_INET;
85	sin.sin_len = sizeof(sin);
86	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
87	sin.sin_port = htons(TCP_PORT);
88
89	if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
90		error = errno;
91		(void)kill(partner, SIGKILL);
92		errno = error;
93		err(-1, "tcp_server: bind");
94	}
95
96	if (listen(listen_fd, -1) < 0) {
97		error = errno;
98		(void)kill(partner, SIGKILL);
99		errno = error;
100		err(-1, "tcp_server: listen");
101	}
102
103	sleep(10);
104
105	accept_fd = accept(listen_fd, NULL, NULL);
106	if (accept_fd < 0) {
107		error = errno;
108		(void)kill(partner, SIGKILL);
109		errno = error;
110		err(-1, "tcp_server: accept");
111	}
112	close(accept_fd);
113	close(listen_fd);
114}
115
116static void
117tcp_client(pid_t partner, int dropflag)
118{
119	struct sockaddr_in sin, sin_local;
120	int error, sock;
121	socklen_t slen;
122
123	sleep(1);
124
125	sock = socket(PF_INET, SOCK_STREAM, 0);
126	if (sock < 0) {
127		error = errno;
128		(void)kill(partner, SIGKILL);
129		errno = error;
130		err(-1, "socket");
131	}
132
133	bzero(&sin, sizeof(sin));
134	sin.sin_family = AF_INET;
135	sin.sin_len = sizeof(sin);
136	sin.sin_addr.s_addr = ntohl(INADDR_LOOPBACK);
137	sin.sin_port = htons(TCP_PORT);
138
139	if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
140		error = errno;
141		(void)kill(partner, SIGKILL);
142		errno = error;
143		err(-1, "connect");
144	}
145
146	slen = sizeof(sin_local);
147	if (getsockname(sock, (struct sockaddr *)&sin_local, &slen) < 0) {
148		error = errno;
149		(void)kill(partner, SIGKILL);
150		errno = error;
151		err(-1, "getsockname");
152	}
153
154	if (dropflag) {
155		if (tcp_drop(&sin_local, &sin) < 0) {
156			error = errno;
157			(void)kill(partner, SIGKILL);
158			errno = error;
159			err(-1, "tcp_drop");
160		}
161		sleep(2);
162	}
163	close(sock);
164}
165
166int
167main(int argc, char *argv[])
168{
169	pid_t child_pid, parent_pid;
170
171	if (signal(SIGCHLD, SIG_IGN) == SIG_ERR)
172		err(-1, "signal");
173
174	parent_pid = getpid();
175	child_pid = fork();
176	if (child_pid < 0)
177		err(-1, "fork");
178	if (child_pid == 0) {
179		child_pid = getpid();
180		tcp_server(parent_pid);
181		return (0);
182	} else
183		tcp_client(child_pid, 0);
184	(void)kill(child_pid, SIGTERM);
185
186	sleep(5);
187
188	parent_pid = getpid();
189	child_pid = fork();
190	if (child_pid < 0)
191		err(-1, "fork");
192	if (child_pid == 0) {
193		child_pid = getpid();
194		tcp_server(parent_pid);
195		return (0);
196	} else
197		tcp_client(child_pid, 1);
198	(void)kill(child_pid, SIGTERM);
199
200	return (0);
201}
202