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
27 /*
28 * TCP regression test which opens a loopback TCP session, and closes it
29 * before the remote endpoint (server) can accept it. Run the test twice,
30 * once using an explicit close() from the client, a second using a tcp drop.
31 */
32
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <sys/sysctl.h>
36
37 #include <netinet/in.h>
38
39 #include <err.h>
40 #include <errno.h>
41 #include <signal.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46
47 #define TCP_PORT 9005
48
49 static int
tcp_drop(struct sockaddr_in * sin_local,struct sockaddr_in * sin_remote)50 tcp_drop(struct sockaddr_in *sin_local, struct sockaddr_in *sin_remote)
51 {
52 struct sockaddr_storage addrs[2];
53
54 /*
55 * Sysctl accepts an array of two sockaddr's, the first being the
56 * 'foreign' sockaddr, the second being the 'local' sockaddr.
57 */
58
59 bcopy(sin_remote, &addrs[0], sizeof(*sin_remote));
60 bcopy(sin_local, &addrs[1], sizeof(*sin_local));
61
62 return (sysctlbyname("net.inet.tcp.drop", NULL, 0, addrs,
63 sizeof(addrs)));
64 }
65
66
67 static void
tcp_server(pid_t partner)68 tcp_server(pid_t partner)
69 {
70 int error, listen_fd, accept_fd;
71 struct sockaddr_in sin;
72
73 listen_fd = socket(PF_INET, SOCK_STREAM, 0);
74 if (listen_fd < 0) {
75 error = errno;
76 (void)kill(partner, SIGKILL);
77 errno = error;
78 err(-1, "tcp_server: socket");
79 }
80
81 bzero(&sin, sizeof(sin));
82 sin.sin_family = AF_INET;
83 sin.sin_len = sizeof(sin);
84 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
85 sin.sin_port = htons(TCP_PORT);
86
87 if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
88 error = errno;
89 (void)kill(partner, SIGKILL);
90 errno = error;
91 err(-1, "tcp_server: bind");
92 }
93
94 if (listen(listen_fd, -1) < 0) {
95 error = errno;
96 (void)kill(partner, SIGKILL);
97 errno = error;
98 err(-1, "tcp_server: listen");
99 }
100
101 sleep(10);
102
103 accept_fd = accept(listen_fd, NULL, NULL);
104 if (accept_fd < 0) {
105 error = errno;
106 (void)kill(partner, SIGKILL);
107 errno = error;
108 err(-1, "tcp_server: accept");
109 }
110 close(accept_fd);
111 close(listen_fd);
112 }
113
114 static void
tcp_client(pid_t partner,int dropflag)115 tcp_client(pid_t partner, int dropflag)
116 {
117 struct sockaddr_in sin, sin_local;
118 int error, sock;
119 socklen_t slen;
120
121 sleep(1);
122
123 sock = socket(PF_INET, SOCK_STREAM, 0);
124 if (sock < 0) {
125 error = errno;
126 (void)kill(partner, SIGKILL);
127 errno = error;
128 err(-1, "socket");
129 }
130
131 bzero(&sin, sizeof(sin));
132 sin.sin_family = AF_INET;
133 sin.sin_len = sizeof(sin);
134 sin.sin_addr.s_addr = ntohl(INADDR_LOOPBACK);
135 sin.sin_port = htons(TCP_PORT);
136
137 if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
138 error = errno;
139 (void)kill(partner, SIGKILL);
140 errno = error;
141 err(-1, "connect");
142 }
143
144 slen = sizeof(sin_local);
145 if (getsockname(sock, (struct sockaddr *)&sin_local, &slen) < 0) {
146 error = errno;
147 (void)kill(partner, SIGKILL);
148 errno = error;
149 err(-1, "getsockname");
150 }
151
152 if (dropflag) {
153 if (tcp_drop(&sin_local, &sin) < 0) {
154 error = errno;
155 (void)kill(partner, SIGKILL);
156 errno = error;
157 err(-1, "tcp_drop");
158 }
159 sleep(2);
160 }
161 close(sock);
162 }
163
164 int
main(int argc,char * argv[])165 main(int argc, char *argv[])
166 {
167 pid_t child_pid, parent_pid;
168
169 if (signal(SIGCHLD, SIG_IGN) == SIG_ERR)
170 err(-1, "signal");
171
172 parent_pid = getpid();
173 child_pid = fork();
174 if (child_pid < 0)
175 err(-1, "fork");
176 if (child_pid == 0) {
177 child_pid = getpid();
178 tcp_server(parent_pid);
179 return (0);
180 } else
181 tcp_client(child_pid, 0);
182 (void)kill(child_pid, SIGTERM);
183
184 sleep(5);
185
186 parent_pid = getpid();
187 child_pid = fork();
188 if (child_pid < 0)
189 err(-1, "fork");
190 if (child_pid == 0) {
191 child_pid = getpid();
192 tcp_server(parent_pid);
193 return (0);
194 } else
195 tcp_client(child_pid, 1);
196 (void)kill(child_pid, SIGTERM);
197
198 return (0);
199 }
200