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
51 static int
tcp_drop(struct sockaddr_in * sin_local,struct sockaddr_in * sin_remote)52 tcp_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
69 static void
tcp_server(pid_t partner)70 tcp_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
116 static void
tcp_client(pid_t partner,int dropflag)117 tcp_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
166 int
main(int argc,char * argv[])167 main(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